Detachably Mounted Cartridge

专利摘要:
CARTRIDGE AND APPARATUS FOR TRAINING AND IMAGES. In a cartridge provided with an electrode portion, to connect a contact of a main assembly and a processing medium, by injecting an electro-conductive resin into a structure, to simplify the structures of the structure and the electrode portion, and to improve the mounting property of the cartridge, and the electrode property of the electrode portion, an electrode of the cartridge is integrally mounted, by injecting an electro-conductive resin into the structure, including a first contact portion, exposed in the towards the outside of the structure, in contact with a main assembly contact on the apparatus main assembly; a second contact portion provided to be electrically connected with the processing means; and an injection receiving portion, into which the resin is injected when the cartridge electrode is molded into the frame, and the electro-conductive resin, injected from the injection receiving portion, is branched to mold the first contact portion and the second contact portion, so that an electro-conductive path, for electrically connecting the main assembly contact and the processing medium,(...).
公开号:BR112013003888B1
申请号:R112013003888-8
申请日:2011-08-19
公开日:2021-08-31
发明作者:Hiroshi Takarada；Kuniaki Hirukawa；Akira Suzuki；Nobuharu Hoshi；Yuichi Fukui
申请人:Canon Kabushiki Kaisha；
IPC主号:

专利说明:

Technical Field
[0001] The present invention relates to an imaging apparatus and a detachable cartridge mountable in a main assembly of the imaging apparatus apparatus. Fundamentals of technique
[0002] Previously, in the imaging apparatus, a type of cartridge was employed in which the processing means were integrally formed in the cartridge and the cartridge could be detachably mounted to a main assembly of the imaging apparatus. In this type of cartridge, in the state of the cartridge mounted in the imaging apparatus main assembly, an imaging apparatus main assembly electrode and an electrode member of the cartridge came into contact so that the receiving conducting members, how the processing means and the like were electrically connected with the main assembly of the imaging apparatus.
[0003] Today, as an example of an electrode member, a constitution in which a metal electrode plate mounted on a frame constituting a cartridge is described in Japanese open-ended Patent Application 2007-47491.
[0004] However, in the conventional example described above, it was necessary to provide an opening, for mounting the electrode plate on the structure, to position the electrode plate on each structure. For this reason, the structures of the frame and the electrode plate were complicated. In addition, a step of assembling the electrode plate with the frame was generated and it was then necessary to treat the electrode plate so as not to cause deformations or similar damages. Description of the invention
[0005] In one embodiment of the present invention, there is provided a cartridge detachably mountable to a main assembly of an imaging apparatus, comprising: (a) a processing means for carrying out the imaging; (b) a frame to support the processing medium; and (c) an integrally molded cartridge electrode by injecting an electro-conductive resin into the frame;
[0006] and the cartridge electrode comprises:
[0007] a first contact portion, exposed towards the outside of the frame, in contact with the main assembly contact, provided in the apparatus main assembly, when the cartridge is mounted in the apparatus main assembly;
[0008] a second contact portion provided to be electrically connected with the processing means; and
[0009] an injection receiving portion into which the resin is injected when the cartridge electrode is molded into the frame; and
[0010] wherein the electro-conductive resin injected from the injection receiving portion is branched to mold the first contact portion and the second contact portion, so that the electro-conductive path to electrically connect the main assembly contact and the processing medium is formed. Brief description of drawings
[0011] Figure 1 includes views illustrating the completion time of an injection of an electro-conductive resin, for formation of a portion of an electrode, according to Embodiment 1.
[0012] Figure 2 includes views illustrating a general arrangement of a processing cartridge, according to Embodiment1.
[0013] Figure 3 includes views illustrating a general arrangement of a drum unit, according to Embodiment 1.
[0014] Figure 4 includes views illustrating a general arrangement of a drum unit, according to Embodiment 1.
[0015] Figure 5 includes views illustrating an electrode forming portion of a drum structure, according to Embodiment 1.
[0016] Figure 6 includes views illustrating a drum structure, according to Embodiment 1.
[0017] Figure 7 includes views illustrating the state in which a mold contacts the drum structure.
[0018] Figure 8 includes views illustrating a back-up.
[0019] Figure 9 includes views illustrating an electro-conductive resin injection, according to Embodiment 1.
[0020] Figure 10 includes views illustrating the movement of the mold before and after the injection of the electro-conductive resin, according to Embodiment 1.
[0021] Figure 11 includes views illustrating the function of an electrode portion.
[0022] Figure 12 is an illustrated view of an electrode portion, according to Embodiment 2.
[0023] Figure 13 includes sectional views of a drum structure and a mold, illustrating the step of injecting the electro-conductive resin to form the electrode portion, according to Embodiment 3.
[0024] Figure 14 is a sectional view of a processing cartridge.
[0025] Figure 15 is a perspective view in which a drum unit is in contact with the electrode of the main assembly.
[0026] Figure 16 includes sectional views of the periphery of each of the contact portions of the drum unit.
[0027] Figure 17 includes illustrations of the shape of a drum unit.
[0028] Figure 18 is an illustration of a mold used when electrode portions are formed.
[0029] Figure 19 is an illustration of a mold used when electro-conductive resin is injected.
[0030] Figure 20 includes illustrations of the mold when it comes into contact with the drum frame.
[0031] Figure 21 includes illustrations of the mold when it is separated from the drum frame.
[0032] Figure 22 includes sectional views in perspective showing the state in which the electro-conductive resin is injected when a contact portion for charging is formed.
[0033] Figure 23 includes sectional views in perspective showing the state in which the electro-conductive resin is injected when an exposed contact portion is formed.
[0034] Figure 24 includes general arrangements of a portion of the electrode to illustrate the shape and cross-section of the contact portions.
[0035] Figure 25 includes general arrangements of the electrode portion, showing the state of contact with the main assembly electrode.
[0036] Figure 26 includes illustrations of a state in which the contact portions are molded into the drum structure.
[0037] Figure 27 includes a view on a graph showing the relationship between the resistance value and the distance to a port position.
[0038] Figure 28 is a schematic view illustrating how to apply pressure during the injection of the electro-conductive resin.
[0039] Figure 29 includes illustrations of a damping portion of the contact portion for loading.
[0040] Figure 30 includes views showing a structure for positioning the loading contact spring.
[0041] Figure 31 includes views showing a structure for positioning the loading contact spring.
[0042] Figure 32 is a view showing an embodiment of when the electrode portion is used in a developing unit. Best Way to Carry Out the Invention
[0043] Hereinafter, embodiments of the present invention are exemplary and specifically described, with reference to the drawings. However, dimensions, materials, shapes, their arrangements and similar constituent elements, described in the embodiments below, should be appropriately modified depending on the constitutions or various conditions of the apparatus to which the present invention is applied, and, therefore, the scope of the present invention is not limited to the following embodiments. Mode of Achievement 1
[0044] Hereinafter, examples of electrophotographic imaging apparatus, according to this embodiment, a processing cartridge, a drum unit, and a method of molding an electrode portion, will be described with reference to the figures. General arrangement of the electrophotographic imaging apparatus
[0045] Part (a) of Figure 2 is a view of a general arrangement of the electrophotographic imaging apparatus A (laser printer) on which the processing cartridge B, in this embodiment, is mounted. With reference to (a) of Figure 2, the electrophotographic imaging apparatus A will be described. Part (a) of Figure 2 is a schematic sectional view illustrating the electrophotographic imaging apparatus A.
[0046] As shown in Figure 2, in the electrophotographic imaging apparatus A, a photosensitive drum 7, like the photosensitive electrophotographic drum, is irradiated with information light (laser light), on the basis of the information of an image, the from an optical device 1 so that a latent image is formed on the photosensitive drum 7. This latent image is then developed with a developer (toner) to form a toner image. In sync with the formation of the toner image, a recording material 2 is driven from a feed cassette 3, and the toner image formed on the photosensitive drum 7 is transferred onto the recording material 2 by a roller. transfer 4. This transferred toner image is fixed onto the recording material 2 by a fixing means 5, and subsequently the recording material 2 is discharged to a discharge portion 6. General arrangement of processing cartridge
[0047] Next, with reference to (a) of Figure 2 and (b) of Figure 2, the processing cartridge B will be described. Part (b) of Figure 2 is a sectional view illustrating a general arrangement of the processing cartridge B in this embodiment. • processing cartridge B consists of a rotatable connection by a developing unit C, and a drum unit D, one relative to the other, and is made detachably mountable with a main assembly 100 of the electrophotographic imaging apparatus A (hereinafter referred to as the main set of the apparatus). Here, the developing unit C is comprised of a developing means, made up of the toner (not shown), and a developing roller 12 and a developing frame (device) 8, for accommodating the toner and supporting the developing medium. Furthermore, the drum unit D is constituted by constituting members such as the photosensitive drum 7 and by a cleaning blade 14 and by a drum structure 13 to support these constituting members. • Toner, accommodated in a toner housing portion 9 of the developing unit C, is sent to the developing chamber 10, so that a layer of toner, to which a turbo-electric charge is transmitted by a developing blade 11 , is formed on the surface of the developer roller 12. Then, the toner formed on the surface of the developer roller 12 is transferred onto the photosensitive drum 7, depending on the latent image described above, so that a toner image is formed on the photosensitive drum 7. Then, after the toner image on the photosensitive drum 7 is transferred onto the recording material 2 by the transfer roller 4, the remaining toner on the photosensitive drum 7 is scraped off by the blade of cleaning 14, so that the waste toner is collected (removed) in a waste toner container 15. Then, the surface of the photosensitive drum 7 is uniformly loaded by a loading roller 16, as a member. the loading (processing means), so that a latent image, in a passive state of being formed by the optical device 1, is created. General arrangement of the drum unit
[0048] Part (a) of Figure 3 is a view of a general arrangement of a portion related to the process of loading the drum unit D, and (b) of Figure 3 is a partial sectional view of the state in which the processing cartridge B, including drum unit D, is mounted in the main assembly of apparatus 100. Part (a) of Figure 4 is a schematic side view of drum unit D, and part (b) of Figure 4 is a schematic perspective view showing drum unit D cut along cross section XX of (a) of Figure 4.
[0049] In the following, a general arrangement of the portion relating to the loading process of drum unit D will be described. As shown in (a) of Figure 3, the loading roller 16, for loading the surface of the photosensitive drum 7, is rotatably supported by a loading bearing (loading roller terminal) 17a, and a loading bearing 17b consisting of an electro-conductive material (eg, an electro-conductive resin) at both end portions 16a and 16b of its central axis. In the loading bearings 17a and 17b, compression springs (contact springs for loading) 18a and 18b are mounted, respectively, so that the loading bearings 17a and 17b are mounted on a drum frame 13, in the state in which the compression springs 18a and 18b can be compressed by the bearing. In this way, the loading roller 16 is supported by the drum structure 13. Furthermore, as shown in (b) of Figure 4, when the photosensitive drum 7 and the loading roller 16 come into contact with each other, the springs of compression 18a and 18b are compressed, and the loading roller 16 is pressed against the photosensitive drum 7, with a predetermined pressure, by a spring force generated at that moment.
[0050] Next, a method of charging the photosensitive drum 7 will be described. As shown in (b) of Figure 4, the compression spring 18b, which is a spring member, when an electro-conductive member contacts the surface of the bearing 20, which is the contact portion for loading the bearing portion. cartridge electrode (hereafter referred to as the electrode portion) 19, formed of an electro-conductive resin integrally molded with the barrel structure 13. Furthermore, the compression spring 18b and the electrode portion 19 are in a state capable of being electrically connected.
[0051] As shown in (b) of Figure 3, when the processing cartridge B is mounted in the main assembly of the apparatus 100, an electrode of the main assembly 21, which is the contact member of the main assembly provided in the main assembly of the apparatus 100 , and the electrode portion 19 integrally molded with the barrel structure 13, come into contact with an exposed contact portion 22. Then, when a voltage is transmitted to the main assembly electrode 21, by command of a controller (not shown) of the apparatus main assembly 100, voltage is applied to the surface of the loading roller 16, via the electrode portion 19, the compression spring 18b, the loading bearing 17b and the end portion 16b of the central shaft. Then, the surface of the photosensitive drum 7 is uniformly charged by the charging roller 16. In this way, the electrode portion 19 is provided to electrically connect the charging roller 16 and the electrode with main assembly 21. That is, the portion of electrode 19 electrically forms the path for electrically connecting the main assembly electrode 21 and the charging roller 16. Furthermore, although the details are described below, the electrode portion 19 is integrally molded with the frame 13 by injecting it. if the recording material from a G gate portion which is an injection receiving portion.
[0052] Here, in this embodiment, the main assembly electrode 21 and the electrode portion 19 are directly connected, but these portions can also be indirectly connected, by means of another electro-conductive member between the main assembly electrode 21 and the electrode portion 19. Furthermore, in this embodiment, although the electrode portion 19 and the loading roller 16 are electrically connected by means of the loading bearing 17b and the compression spring 18b therebetween, the portion electrode 19 and charging roller 16 may also have a constitution in which these portions are directly connected.
[0053] Furthermore, in this embodiment, the case of an electrode portion 19 being applied to the charging process of the photosensitive drum 7 is described, but the present invention is not limited thereto. That is, in all constitutions, which need an electrical connection, from the developer roller 12, a supply roller (not shown), to supply the developer to the developer roller, the drum 7, a detection circuit (not shown shown), for the amount of remaining toner, and the like, the electrode portion of the cartridge, according to this embodiment, can be applied. Method of forming the electrode portion
[0054] In the following, a method for forming the electrode portion (electrode member) 19 will be described. The electrode portion 19 is integrally molded with the drum structure 13 by injecting the electro-conductive resin into an electrode forming portion 40, which is a space formed between the drum structure 13 and a mold 27, like injection molding, and that is a space to form an electrode. Here, the electrode forming portion 40 is formed between the drum structure 13 and the metal mold 27, the mold 27 being disposed in contact with the drum structure 13. Furthermore, the metal mold 27 is provided. as a separate member of the barrel structure 13, to mold one shape of an electrode portion 19 (see (b) of Figure 8). Incidentally, the metal mold 27 is injected from the outside into the drum structure 13.
[0055] Part (a) of Figure 5 is a schematic perspective view of the electrode forming portion of the drum structure 13, and (b) of Figure 5 is a view showing the mold 27, which will come into contact with the drum structure. Part (a) of Figure 6 is a schematic side view of drum structure 13, and (b) of Figure 6 is a schematic perspective view showing drum structure 13, cut along cross-section YY shown in ( a) of Figure 6.
[0056] In the following, the electrode forming portion 40 of the drum structure 13, before the electrode portion 19 is molded, and the mold 27, will be described.
[0057] As shown in (a) of Figure 5 and in (a) and (b) of Figure 6, in a surface on which the electrode portion 19 of the drum structure 13 is to be molded, a recess 23 into the which resin is to be injected, and a mold contact surface 24, including a mold contact portion 24a (indicated in dotted lines in (a) and (b) of Figure 6) to which the mold 27 is to be contacted, are provided. Furthermore, in a part of the drum structure 13, an injection molding part 33 (described below), which communicates with the recess 23, constituting the electrode forming portion 40, for molding the surface of the bearing 20, to receive the compression spring 18b, is provided.
[0058] As shown in (b) of Figure 5, like the mold 27, the mold contact surface 27a, an excavated portion 27b into which the electro-conductive resin is to be injected, a projection 27c to mold the surface of bearing 20 for receiving compression spring 18b, and the like, are integrally provided.
[0059] Part (a) of Figure 7 is a schematic perspective view of the state in which the mold 27 is in contact and affixed to the drum structure 13, and (b) of Figure 7 is a schematic perspective view of a section along the ZZ cross section shown in (a) of Figure 7. Part (a) of Figure 8 is a view illustrating back-up during attachment, and (b) of Figure 8 is a schematic sectional view. illustrating back-up during fixing.
[0060] In the following, a method of fixing, in a process (step) of molding the electrode portion 19, will be described.
[0061] When the portion of the electrode 19 is molded, as shown in (a) of Figure 7 and in (b) of Figure 7, the fixation is performed by bringing the mold 27 into contact with the mold contact surface 24 of a drum frame 13. During clamping, as shown in (a) of Figure 8 and (b) of Figure 8, a rear side of the mold contact surface 24 is supported by a back-up member ( backup mold) 28. This is because the mold contact portion 24a of the drum structure 13, and the contact surface of the structure 27a of the mold 27 are prevented from deviating (from escaping), and the drum structure 13 is prevented from deforming by a pressure force of the mold 27 and the pressure of the resin P during the injection of the resin. In this embodiment, the support portion supports the rear side (back surface) of the mold contact surface 24, but it may also be able to suppress the deflection and deformation of the drum structure 13 by supporting the contact surface. of the mold 24 on a side (surface) other than the back surface (back surface).
[0062] Part (a) of Figure 1 is a schematic perspective view of a cross section of a portion of the barrel structure 13, in the state that a final injection portion 30 of a resin injection device 29 is in contacting an injection port 26 of the mold 27 shown in (a) of Figure 8. Part (b) of Figure 8 is a partially sectioned view of the drum structure 13, in the state where the final injection portion 30 of the resin injection device 29 is in contact with injection port 26 to inject resin. Part (a) of Figure 9 is a schematic perspective view of the structure of the drum 13 after the mold has been opened. Part (b) of Figure 9 is a cross-sectional view MM of (a) of Figure 9, and (c) of Figure 9 is a cross-sectional view NN of (a) of Figure 9. Parts (a) and ( b) of Figure 10 are views including the cross sections ZZ of (a) of Figure 7 and are views showing a partial cross section of the drum structure 13, in which case the drum structure 13 is viewed from an angle different from the angle of Figure 1. Part (a) of Figure 10 is a view showing the movement of the mold 27 from the mold injection, before the resin injection, to the mold opening through the mold fixture, and ( b) of Figure 10 is a partially sectioned view of the drum structure 13 showing the open state of the mold, and is a partially sectioned view during recycling described below.
[0063] In the following, a resin injection method of the molding process of a portion of electrode 19 will be described with reference to Figure 1, (b) of Figure 2, and Figures 8 to 10.
[0064] As shown in (a) of Figure 10, in a part of the drum structure 13, the part of the injection mold 33 that communicates with the recess 23 (see (a) of Figure 5), constituting the portion of forming the electrode 40, for molding the bearing surface 20, for receiving the compression spring 18b, is provided. Then, the projection 27c of the mold 27 is injected into the injection port 33, to bring the mold 27 into contact with the drum structure 13 relative to the substantially vertical direction (left direction of the arrow in the figure), in the portion. of contact 22, provided on the barrel structure 13, for electrically connecting the mold 27 with the main assembly of the imaging apparatus, by injecting the projection 27c of the mold 27 into the injection port 33.
[0065] Then, in the state that the final injection portion 30 of the resin injection device 29 is in contact with the injection port 26 of the mold 27, shown in (a) of Figure 8, as shown in (b ) of Figure 8, a molten electro-conductive resin 34 is injected into the electrode forming portion 35, which is the space formed by the drum structure 13 and the mold 27.
[0066] Then, the resin injection device 29 is separated from the injection port 26 of the mold 27 and, still as shown in (a) of Figure 10, the mold 27 is separated in a direction to the right of the arrow in the figure , so that, as shown in (a) of Figure 9, the electrode portion 19 is in the state in which it is integrally formed with the drum structure 13.
[0067] Part (b) of Figure 9 is an M-M cross-sectional view of (a) of Figure 9.
[0068] A flow passage of the molten resin injection, from the resin injection device 29, has a width T, of the recess 50 of the drum structure 13, in the vicinity of the gate portion G, being the receiving portion of the injection, configured about 2.5 mm narrower than other portions. This is because as shown by the arrows in (b) of Figure 9, the internal pressure of the resin, during resin injection, is increased, so that the amount of shrinkage, after cooling, is brought as close to zero as possible. . With this, the bond strength (adhesive strength) of the electro-conductive POM (polyacetyl) with the drum structure 13 of PS (polystyrene) is increased, thus allowing for integrated molding. In this way, if the cartridge experiences vibrations and falls, it is possible to prevent the electrode portion 19 from being disconnected from the drum structure 13. Consequently, there is no need to intentionally provide a retaining portion and thus there is no need to provide a recessed portion (retaining portion) for the drum frame 13, relative to the arrow direction of (b) of Figure 10. Furthermore, during recycling, when the electrode portion 19 is pulled out of the drum frame 13, in the direction of the arrow (direction one), with a force that is not less than a given value, the electrode portion 19 can be disassembled, in the opposite direction to the injection mold 27 direction, into the drum structure 13. Hitherto, the case that the resin injection device and the mold 27 are separate members is described, but, of course, the members can also be provided integrated.
[0069] The molding of the electrode portion 19 will be further described; in the following, the positional relationship between the mold 27 and the structure 13, prior to resin injection, will be described with reference to (a) and (b) of Figure 10, which are views including the ZZ cross section of (a) of Figure 7.
[0070] In the structure of the drum 13, in a terminal portion on the downstream side in relation to the direction of injection of the electro-conductive resin, from the injection port 26 to the electrode forming portion 40, a damping portion 32, as an accommodation portion to accommodate the resin extruded from the electrode forming portion 40 is provided. As shown in (b) of Figure 10, resin 34a extruded from electrode forming portion 40 flows into and remains in buffer portion 32, which is a spacing between frame 13 and projection 27c, of so that the resin injection flows into the electrode forming portion 40. Incidentally, in this Embodiment 1, the buffer portion 32 is provided in the lateral end portion downstream of the electrode forming portion 40, but it is not limited thereto and may also be provided in an intermediate portion of the electrode forming portion 40. That is, the damping portion 32 may be provided for the drum structure 13 to accommodate (maintain) the resin extruded from the drum structure 13.
[0071] Furthermore, during resin injection, the fixation is performed in a state in which the projection 27c, having a flat surface portion, provided in the mold part 27, is injected into the mold injection port 33 , provided for the barrel structure 13. For this reason, as shown in (a) and (b) of Figure 10, when the mold opening is made after completion of resin injection, the bearing surface 20 of the portion of the electrode 19, consisting of electro-conductive resin, is formed. The bearing surface 20 of the electrode portion 19 is the bearing surface for receiving the compression spring 18b when the compression spring 18b is further assembled, thus constituting a contact portion for electrically connecting the compression spring 18b with the electrode portion 19.
[0072] When the description is supplemented with reference to (b) of Figure 3, the electrode portion 19 includes a contact portion (surface) 22 as the first contact portion exposed to the outside of the drum structure 13, and the bearing surface 20, as the second contact portion exposed in the direction of the transverse direction, in which the first contact portion is exposed. The contact portion 22 is a surface to which the main assembly electrode 21, as the main assembly contact, is to be electrically connected when the processing cartridge B is mounted in the main assembly of the imaging apparatus A. Furthermore , the bearing surface 20 constitutes a receiving portion of the compression spring 18b to be electrically connected with the compression spring 18b and the loading bearing 17b.
[0073] Using (a) of Figure 11 and (b) of Figure 11, the portion of electrode 19 will be further described. The positioning of an outer diameter portion 26 of a compression mold 18b of a connecting member (electro-conductive member), including the compression spring 18b and the load bearing 17b, is carried out as follows. That is, the positioning of the outer diameter portion 26 of the compression spring 18b is carried out for at least a portion of the positioning, of the positioning portions of the electro-conductive member 25a, 25b and 26c, provided for the electrode portion 19, having contact portion 22 (the hatched portion in the figure), to be electrically conducted to the main assembly of the imaging apparatus.
[0074] Furthermore, also the bearing surface 20, constituting the above-described compression spring receiving portion 18b, is formed to determine the spring force of the compression spring 18b, to force the loading roller 16 into the middle of processing, against the photosensitive drum 7 as the image-carrying member, with a certain pressure.
[0075] In this embodiment, the above-described electro-conductive member positioning portion 25b also has the function of damping portion 32 to accommodate the extruded resin 34a.
[0076] In this embodiment, a recess 23 is provided for the electrode forming portion 40 to facilitate the integrated molding of the electrode portion 19 with the drum structure 13, but the present invention is not limited thereto. As another method for obtaining (increasing) the bond strength, using a different material, as shown in (c) of Figure 9, which is a cross-sectional view NN of (a) of Figure 9, a projection 53 is provided for the frame 13 and a compressive force (indicated by the arrows in the figure) of the electroconductive resin material, which can also be used. This is also a method of increasing the surface contact area parallel to the direction of extraction to increase the bonding force, in the case that a material for the drum structure 13 and a material for the electrode portion 19 do not have or do not have low compatibility (affinity).
[0077] Furthermore, the projection 53 additionally achieves the effect of being provided substantially parallel to the direction of flow of the electro-conductive resin. This is because the bond strength with the structure of the drum 13 can be increased by using a higher coefficient of contraction, in relation to the direction perpendicular to the resin flow, than that relative to the resin flow direction, without disturbing the flow of resin.
[0078] Furthermore, in the electrode portion 19, the electro-conductive resin injected from the gate portion G, when the injection receiving portion in the direction of arrow F1 is branched, and modified in direction, to flow in the direction of arrow F2 and in the direction of arrow F3, as shown in (b) of Figure 1, Figure 9 and Figure 11. Then the electro-conductive resin, with the direction changed in the direction of arrow F2, molds the portion 22, as the first contact portion. The electro-conductive resin, with the direction modified in the direction of arrow F3, additionally changes its direction to a direction (arrow F4) substantially perpendicular thereto and flows, so that the bearing surface 20, as the second portion of contact, is formed. Then, the contact of the main assembly 22 and the charging roller 16, as a processing means, are electrically connected to form an electrode path. By employing this constitution, the electro-conductive property between the contact portion 22 and the bearing surface 20 is improved. This is, although described below, through the flow of the electro-conductive resin, injected from the gate portion G, and in a modified direction, the distribution and orientation, of the electro-conductive material (from the electro-conductive filling) , contained in the electro-conductive resin, become random. The electro-conductive resin is placed in a state such that the resulting electrode has a better electro-conductive property than that of the electrode that extends only in the direction in which the electro-conductive resin is injected from a gate portion. Mode of Achievement 2
[0079] Next, Realization Mode 2 will be described.
[0080] Figure 12 is a view illustrating the state in which the electro-conductive resin 34 is injected and the state in which the compression spring 18b is mounted on the drum structure 13 in advance. Furthermore, in Embodiment 1, assuming that the compression mold 18b is assembled after the electrode portion 19 is molded, the positioning portions 25a, 25b and 25c for receiving the compression spring 18a are provided. On the other hand, as shown in Figure 12, in the state where the compression mold 18b, as an electro-conductive member, is mounted inside the drum structure 13 in advance, the electro-conductive resin 34 can also be injected and fixed. At that time, the resin 34 is injected so that the injected resin 34 contacts the compression spring 18b to ensure the electrical connection. Furthermore, in case the electro-conductive resin 34 is injected so as to come into contact with the compression spring 18b, the resin 34 in contact with the compression mold 18b is prevented from influencing the spring pressure of the spring. of compression 18b. By properly adjusting the amount of resin, resin 34 can contact compression spring 18b. Furthermore, a part of the compression spring 18b can also be buried with resin 34 if the function of the compression spring 18b is ensured.
[0081] Furthermore, the electrode portion, in this embodiment, electrically connects the charging roller 16 and the main assembly electrode 21 in the drum unit D, but the present invention is not limited thereto. The electrode portion can also be electrically connected, for example, with the photosensitive drum 7 as a bearing member, of the image-carrying member of the apparatus main assembly 100 in the drum unit D. Furthermore, the electrode portion can also be provided, correspondingly, in each photosensitive drum 7 and charging roller 16. That is, the electrode portion for electrically connecting the charging roller 16 and the apparatus main assembly 100, and the electrode portion for electrically connecting the drum photosensitive 7 and the main set of the device can also be provided. Furthermore, the charging roller 16 and the electrode portion, and the photosensitive drum 7 and the electrode portion may also be, respectively, similarly as described above, constituted so as to be electrically connected by means of the spring of 18b compression or directly.
[0082] Furthermore, this embodiment has been described using drum unit D, but the electrode portion can also be applied to the developing unit C. Furthermore, the electrode portion can also be applied to a processing cartridge prepared to mount integrally with the photosensitive electrophotographic drum and a plurality of processing means operating on the photosensitive drum within the cartridge. In case an electrode portion is applied in such a processing cartridge, the electrode portion can also be provided in a plurality of electrode portions correspondingly to each of the photosensitive electrophotographic drums and the plurality of recording materials. Furthermore, the electrical connection with the electrode portion in the constitution of the photosensitive electrophotographic drum and the plurality of processing means can be constituted, similarly to the above, to be made by means of a compression spring 18b or directly . Furthermore, the imaging apparatus A in this embodiment is a processing cartridge B, and can be detachably mounted. Meanwhile, the imaging apparatus A may also be a color imaging apparatus for forming color images, to which the plurality of processing cartridges or developing cartridges is detachably mounted.
[0083] As described above, according to this embodiment, compared to the conventional embodiment, the electrode portion is molded by injecting the electro-conductive resin into the structure and, in this way, it is possible to eliminate problems of handling, such as trapping, deformation or similar problems of the electrode portion, whose occurrence is of concern during assembly.
[0084] Furthermore, in the conventional embodiment, it was required that the cartridge structure be provided with openings, positioning holes, cut-out portions, and the like, for the assembly of the electrode portions and, thus, there was the possibility of reducing the strength of the structure. On the other hand, according to this embodiment, into the holes, or the like, of the structure provided as the electrode forming portion, the resin is injected and, in this way, these holes can be filled with the resin, so that it is possible to suppress the reduction in the strength of the structure. Furthermore, the electrode portion is molded by the branching of the flow passage from the port, when the electro-conductive resin is injected into the structure, so that the improvement of the electro-conductive property of the electrode portion can be fulfilled. Mode of Achievement 3
[0085] Next, Realization Mode 3 will be described.
[0086] Hereinafter, examples of constitutions of a processing cartridge, according to Embodiment 3, a developing unit, an electrical contact portion (hereinafter referred to as the contact portion) and a molding method, will be described with reference to the figures.
[0087] General arrangement of the processing cartridge
[0088] Figure 14 is a sectional view to illustrate a processing cartridge B2 in this embodiment. This processing cartridge B2 is detachably mounted in the main assembly of apparatus 100 shown in Embodiment 1. Processing cartridge B2 is comprised of a developer unit C2, and a drum unit D2, with rotary connection, one in relation to another. Here, the developing unit C2 is constituted by a developing means, constituted by the toner (not shown) and a developing roller 112, a toner supply roller 116, a developing structure (device) 108 supporting the rollers therein, and a toner accommodating portion, to accommodate the toner, comprising a developing frame 108. In addition, the drum unit D2 comprises a photosensitive drum 107, a cleaning blade 114 and a drum frame 113 for supporting these members. • Toner accommodated in a toner housing portion 109 of the developing unit C2 is sent to the developing chamber 110. Then the toner is supplied to a toner supply roller 116, which is disposed on the periphery of the roller. development 112, and rotates in the direction of arrow E into contact with the development roller 112 and is supplied to the development roller 112. Then, the layer thickness of a layer of toner on the development roller 112 is regulated by a developer blade 111. Then, the toner layer formed on the surface of the developer roller 112 is transferred to the photosensitive drum 107, so that the latent electrostatic image formed on the photosensitive drum 107 is developed into a toner image . Then, the toner image on the photosensitive drum 107 is transferred towards the recording material (recording medium) 2 by the transfer roller 4 (see Figure 2). Thereafter, the toner remaining in the photosensitive drum 107 is eliminated by the cleaning blade 114, so that the waste toner is collected (removed) in a waste toner accommodation chamber 115. After that, the surface of the photosensitive drum 107 is uniformly loaded by a loading roller 118 as a loading member (processing means), so that a latent image, in the state capable of being formed by the optical system 1 (see Figure 2), is created. General arrangement of the drum unit
[0089] A general arrangement of a drum unit will be described using Figure 14, Figure 15 and Figure 16.
[0090] Figure 15 is an illustration of a portion related to the process of loading the drum unit D2, in the state that the processing cartridge B2 is mounted in a main assembly of an image forming apparatus A. The part (a) of Figure 16 is a side view (a view as viewed from the downstream side of arrow N in Figure 15) on a side where the contact portion of drum unit D2 is provided. Furthermore, (b) of Figure 16 is a sectional view of a periphery of a spring bearing surface, forming a cut-away portion along the cross-section X2-X2 shown in (a) of Figure 16; and at (c) of Figure 16 is a sectional view of the periphery of a contact surface cut along the cross section Y2-Y2 shown at (a) of Figure 16.
[0091] As shown in Figures 15 and 16, the loading roller 118, for loading the surface of the photosensitive drum 107 is rotatably supported by loading bearings 123a and 123b, on both end portions 118a and 118b, of their central axes. The 123a loading bearing is made of an electro-conductive material (eg an electro-conductive resin). In addition, load bearings 123a and 123b, compression springs 122a and 122b are mounted, respectively. Loading bearings 123a and 123b are mounted on drum frame 113 in the state where compression springs 122a and 122b can be compressed. In this way, the loading roller 118 is rotatably supported by the drum structure 113. Furthermore, as shown in (b) of Figure 16, when the photosensitive drum 107 and the loading roller 118 come into contact with each other, the compression springs 122a and 122b are compressed, and the loading roller 118 is pressed against the photosensitive drum 10, with a pressure predetermined by the force of the spring generated at that moment.
[0092] Method of making contact and applying voltage to a drum unit • photosensitive drum charging method 107 will be described using Figure 15, Figure 16, Figure 25 and Figure 26. , an electrode portion 119 is formed by injecting an electro-conductive resin 134 into a gap formed when molds 127 and 128 are brought into contact with drum frame 113 (see Figure 13). Figure 26 includes illustrative views of the cleaning structure 113 into which the electrode portion 119 is molded. As shown in Figure 15, Figure 16, Figure 25 and Figure 26, the electrode portion 119 is integrally molded with the barrel frame 113. A specific molding method will be described below. The electrode portion 119 includes a charging contact portion 119b as the first contact portion and an exposed contact portion 119a as the second contact portion. Furthermore, although described below, the electrode portion 19 consists of an exposed contact portion 119a, a charging contact portion 119b, a first connecting portion 119c, a port portion 119d, as an injection receiving portion of the electro-conductive resin, and in a trunking portion 119c1. The charging contact portion 119b is connected by means of the second connecting portion 119c2 branching from the first connecting portion 119c. Furthermore, the exposed contact portion 119a and the charging contact portion 119b are connected by means of the second connecting portion 119c2 and the first connecting portion 119c. The exposed contact portion 119a is exposed from a side surface 113j of the drum frame 113 in the outward direction. Furthermore, when the processing cartridge B2 is mounted in the imaging apparatus A, the main assembly electrode 121 provided in the apparatus main assembly 100 and the exposed contact portion 119a come into contact with each other. On the other hand, the loading contract portion 119b contacts the compression spring 122a. In this way, after the processing cartridge B2 is mounted in the imaging apparatus A, by means of a command from a controller (not shown) provided in the apparatus main assembly 100, a voltage is applied to the main assembly electrode 121 In this way, voltage is applied to the surface of the loading roller 118, via the exposed contact portion 119a, the connecting portion 119c, the loading contact portion 119b, the compression spring 122a, the loading bearing 123a , electro-conductive resin, and central axis 118a. Then, the surface of the photosensitive drum 107 is uniformly charged by the charging roller 118. In this way, the electrode portion 119 electrically connects the charging roller 118 and the main assembly electrode 121.
[0093] Here, in this embodiment, the main assembly electrode 121 and the electrode portion 119 are directly connected, but these portions can also be indirectly connected, by means of another electro-conductive member, between the assembly electrode main 121 and electrode portion 119. Furthermore, in this embodiment, although electrode portion 119 and loading roller 118 are electrically connected by means of loading bearing 123a and compression spring 122a therebetween, the electrode portion 119 and the charging roller 118 may also have a constitution in which these portions are directly connected.
[0094] Furthermore, in this embodiment, the case of a portion of the electrode 119 applied in the charging process of the photosensitive drum 107 is described, but the present invention is not limited thereto. That is, in all constitutions, which require the electrical connection of a circuit for detecting the amount of remaining toner (not shown), or the like, in addition to the energizing process for the developing roller 12, as a developing member, a process power supply to the toner supply roller and an electrical connection to a ground drum (not shown), the electrode portion can be applied. drum structure
[0095] A shape of the structure of the drum 113 will be described using Figure 16 and Figure 17. Figure 17 includes views showing the shape of the structure of the drum 113, before the electro-conductive resin is injected. Part (a) of Figure 17 is a side view of the side surface 113j where the exposed contact portion 119a of the drum frame 113 is formed; and (b) of Figure 17 is a partial view of the outward appearance when the drum frame 113 is viewed from the side door 13d. Part (c) of Figure 17 is a sectional view of when the drum frame 113 is cut at the (Z-Z) position shown in (b) of Figure 17; (d) of Figure 17 is a sectional view of when the drum frame 113 is cut into position (V-V) shown in (a) of Figure 17; and (e) of Figure 17 is a sectional view when the drum frame 113 is cut into position (WW) shown in (a) of Figure 17. As shown in (a) and (c) of Figure 17, the frame The drum 113 includes a flow passage 113 in which the electro-conductive resin for molding the exposed contact portion 119a will flow, and a recess 113b for molding the contact portion for loading 119b. In addition, the barrel structure 113 includes a contact surface 113e to which the mold 127 is to be contacted when the exposed contact portion 119a is molded and the contact surface 113f to which the mold 128 is to be contacted. In addition, the barrel structure 113 includes an injection portion 113d to allow injection of the electro-conductive resin 134. The barrel structure 113 includes a flow passage 113c having the shape of a tunnel, and the flow passage 113c is branched into two flow passages at an intermediate trunking portion 113h. The injection port 113d, the flow passage 113a, and the recess 113b are connected via this trunking portion 113h. Mold for forming the contact portion
[0096] Using Figure 17, Figure 18, Figure 22 and Figure 23, the molds for molding the portion of the electrode 119 will be described. Figure 18 is a view showing the mold 127 which is one of two molds that come into contact with the frame of the drum 113.
[0097] Figure 22 includes sectional views of when the mold 127 contacts the drum structure 113, and then the electro-conductive resin 134 is injected into the mold from the contact portion for loading 119b. As shown in (a) of Figure 22, by contacting the mold 127 with the drum frame 113, by a projection 127b provided on the mold 127 and on the drum frame 113, a space 120b is formed. Then, as shown in (b) of Figure 22, the electro-conductive resin 134 passes through the tunnel-shaped resin flow passage 113c, so that the electro-conductive resin 134 flows into space 120b. Then, as shown in (c) of Figure 22, the injection of electro-conductive resin 134 into space 120b is completed, so that the charging contact portion 119b is formed.
[0098] Figure 23 includes sectional views of when the mold 127 contacts the drum structure 113, and then the electro-conductive resin 134 is injected to mold the exposed contact portion 119a. As shown in (a) of Figure 23, by contacting the mold 127 with the drum frame 113, the flow passage 113a of the drum frame 113 and the recess 127c of the mold 127 are in the connected state. Then, in (b) of Figure 23, the electro-conductive resin 134 passes through the tunnel-shaped resin flow passage 113c and further flows into the flow passage 113a. Then, at (c) of Figure 23, the injection of electro-conductive resin 134 into recess 127c is completed; wherein the exposed contact portion 119a is formed.
[0099] That is, the mold 127, for molding the electrode portion 119, includes a surface 127a to be superimposed against the surface 113e of the drum structure 113e, the recess 127c, for molding the exposed contact portion 119a, and projection 127b, for molding the contact portion for loading 119b.
[0100] In addition, using Figure 13, Figure 16 and Figure 19, the mold 128, to allow the injection of electro-conductive resin when the electrode portion is molded. Figure 13 includes sectional views in perspective showing, from the mold contact 128 to the drum frame 113, until the injection of the electro-conductive resin is completed, in the form of a time series. In addition, Figure 19 is a view showing only the mold 128. The mold 128 has a surface 128a, to be superimposed against the drum frame 113, and an injection port 128b, within which a nozzle 130 allows injection. of electro-conductive resin 134 can be inserted. Method of forming the electrode portion
[0101] Using Figure 13, Figure 16 to Figure 23, Figure 26 and Figure 28, the method of molding the exposed contact portion 119a, and the loading contact portion 119b, will be described. Figure 20 includes perspective views showing the steps for bringing molds 127 and 128 into contact with drum structure 113, based on a time series. Figure 21 includes perspective views showing stages of mold separation in contact with the drum structure 113 based on a time series.
[0102] The electrode portion 119 is integrally molded with the drum structure 113 by injecting the electro-conductive resin into a space formed between the drum structure 113 and the mold 127. First, as shown in (a) of Figure 20, mold 128 is brought into contact with drum frame 113, from the direction of arrow D1. At this time, a contact surface of mold 113f, of drum frame 113, and surface 128a of mold 128 overlap each other.
[0103] Then, as shown in (b) of Figure 20, the mold 127 contacts the drum structure 113, from the direction of arrow D2. At this time, a mold contact surface 113e of the drum frame 113 and a surface 127a of the mold 127 overlap against each other. Furthermore, a back-up mold 137 overlaps against the drum frame 113, from the direction of arrow D3.
[0104] That is, the mold 137 overlaps against the surface opposite the surfaces where the molds 127 and 128 make contact with the structure of the drum 113, thus preventing the structure of the drum 113 from being deformed, by the contact of the molds 127 and 128 with the drum structure 113. Details regarding the back-up will be described below.
[0105] Furthermore, the state in which the contact of the three molds 127, 128 and 137 is completed is as shown in (c) of Figure 20. At this time, as shown in (a) and (d) of Figure 17 and in (a) of Figure 22, projection 127b of mold 127 is inserted into recess 113b to form space 120b. Furthermore, as shown in Figure 18 and in (a) of Figure 23, when the mold 127 contacts the drum structure 113, a gap, obtained by adding the recess 127c of the mold 127 and the flow passage 113a of the drum structure 113, is formed.
[0106] Then, as shown in (a) of Figure 13 and in (d) of Figure 20, the nozzle 130 through which the electro-conductive resin 134 is to be injected is inserted, from the direction of arrow D4 to inside the injection port 128b of the mold 128, to overlap against a portion of the rear end of the injection port 28b. At this point, the nozzle 130 and the mold 128 can also be formed originally integrated. Furthermore, the constitution in which the mold 128 is not used and the nozzle 130 is directly inserted into the injection port 113d of the drum frame 130, and then the electro-conductive resin 134 is injected, can also be injected. employees. Or, a constitution in which surface 130a is provided at a periphery of the end of the nozzle 130, and after the surface 130a is superimposed against the structure of the drum 113, the electro-conductive resin 134 is injected, can also be employed. Then, as shown in (b) of Figure 13, the electro-conductive resin 134 is injected into the resin flow passage 113c of the drum frame 113 via the injection port 128b. Then, the electro-conductive resin 134 runs along the resin flow passage 113c to reach the trunking portion 113h. A part of the electro-conductive resin 134, having reached the trunking portion 113h, flows into the space 120b, and a remaining part of the resin flows along the resin flow passage 113c, and gradually fills the flow passage. 113a and recess 127c. Part (c) of Figure 13, (c) of Figure 22 and (c) of Figure 23 are views showing states where the injection of electro-conductive resin 134 into space 120b and spaces with flow passage 113a , and recess 127c, is completed.
[0107] Furthermore, as described above, the mold 137 was shrunk to the surface opposite the surfaces on which the molds 127 and 128 were contacted with the structure of the drum 113. This prevents the deformation of the structure of the drum 113, due to to the contact of the molds 127 and 128 with the structure of the drum 113. Additionally, this is also because the structure of the drum 113 is prevented from being moved and deformed by the pressure of the resin P, during the injection of the resin, as shown in Figure 28.
[0108] Then the partition description will be made. Figure 21 includes views showing the steps of mold partitioning, after resin injection has been completed, based on a time series. First, as shown in (a) of Figure 21, the nozzle 130 is displaced, from the injection port 128b, and the mold 128 in the direction of arrow D5 to be retracted. Then, as shown in (c) of Figure 21, mold 127 and back-up 137 are moved, from drum frame 113, in the direction of arrows D6 and D7. Finally, as shown in (d) of Figure 21, the mold 128 is displaced, from the drum frame 113 in the direction of arrow D8, so that the electrode portion 119 (the exposed contact portion 119a, the portion charging contact 119b) focuses on a state where it is integrally formed with the drum structure 113.
[0109] Furthermore, as shown in (b) of Figure 26, the contact portion for loading 119b, an extruded portion 119b2, in which an excess electro-conductive resin is extruded, from a periphery of the contact portion to loading 119b, due to the variation of the injection amount, is formed. Although details are described below, this extruded portion 119b2 is formed to reliably mold the shape of the loading contact portion 119b.
[0110] Furthermore, as shown in Figure 17, the resin flow passage 113c, from the injection port 113d to the spring recess 113b, and from the injection port 113d, to the flow passage 113a , is surrounded by the drum structure 113. For this reason, if an electrode portion different from the electrode portion 119 is provided for the drum structure 113, it is possible to reduce the possibility of occurrence of a problem such as short circuit, due to electrical discharge caused by the proximity of the respective electrode portions. This electrical discharge short circuit is likely to occur at a creepage distance (for insulation) or a spatial distance of no more than a predetermined value. Here, leakage distance refers to the distance from the molded electrode to another electrode along the wall of the structure (minimum distance) if there is a plurality of contact portions. Furthermore, spatial distance refers to a linear spatial distance (minimum distance) from a molded electrode to another electrode. Unless this distance is sufficiently guaranteed, a voltage applied to the electrode on one side is applied to the other electrode, so that there is a possibility that the voltage value will change. Function of each electrode portion shape and resistance value trend
[0111] Next, using Figure 24, Figure 25 and Figure 27, the shapes of the molded electrode portion 119 will be described. Figure 24 includes views illustrating the respective functions of the electrode portion 119 for which molding is complete. The drum structure 113 is not shown, to facilitate an understanding of the shapes of the electrode portion 119. Figure 25 includes views of when the main assembly electrode 121, compression spring 122a, and loading bearing 123a are shown. Figure 27 includes views showing a simple model to illustrate the correlation between the electrical resistance value and the distance from the gate. As shown in (a) and (b) of Figure 24, the electrode portion 119 includes an exposed contact portion 119a and a charging contact portion 119b. As shown in (a) of Figure 25 and (b) of Figure 25, when the processing cartridge B2 is mounted in a main assembly of apparatus 100 of forming and imaging apparatus A, the electrode of main assembly 21 comes into contact. with exposed contact portion 119a. Furthermore, when the loading roller 118 is assembled, a metal core of the loading roller 118a contacts the loading bearing 123a, consisting of an electro-conductive resin, so that the loading roller 118 is rotatably supported. . Furthermore, an electro-conductive path from the electrode of the main assembly electrode assembly path 121 to the metal core of the loading roller 118a is ensured by means of compression spring 122a in contact with the loading bearing 123, the loading contact portion 119b contacting the compression spring 122a, the connecting portion 119c and the exposed contact portion 119a.
[0112] Then, as shown in (a), (d) and (e) of Figure 17 and Figure 24, the electrode portion 119 is different in cross section from the exposed contact portion 119a and the contact portion for loading 119b, when compared to the connecting portion 119c. Here, the cross-sectional shape refers to, when (b) of Figure 24 is taken as an example, as shown in the figure, cross-sections when the electrode portion 119 is cut along the cut lines P-P, Q-Q and R-R.
[0113] Specifically, as shown in (c), (d) and (e) of Figure 24, the cross section cut along P-P is (c) of Figure 24; the cross section cut along Q-Q is (d) of Figure 24; and the cross section cut along R-R is (e) of Figure 24; and, the transverse shapes cut along the respective cut lines are mutually different shapes. Furthermore, the direction of flow of resin 119f, of resin passing from port portion 119d through connecting portion 119c, and flowing outward in directions 119h and 119i, from connecting portion 119c, when portion exposed contact portion 119a and the loading contact portion 119b are molded, are different. For this reason, the distribution status of the electro-conductive material (electro-conductive filling) added to the electro-conductive resin 134 is different between the connecting portion 119c, the exposed contact portion 119a, and the charging contact portion. 119b. That is, the electro-conductive material is in the state where it is not oriented in a certain direction, but oriented in a transverse direction crossing one direction.
[0114] In general, it is confirmed that when a mold in the form of a plate, without curved portions, extending in the resin injection direction, and a mold having a shape, extending in the resin direction, and , then, provided with a curved portion in relation to the injection direction, are compared, the latter having a low resistance value during electrical conduction. This is due to the fact that adequate electro-conductivity is improved by the presence of, or the possibility of, a curved portion, in relation to the direction of resin injection, and a random distribution of the electro-conductive material (carbon black , however, described below) on the resin.
[0115] In this embodiment, as shown in (a) of Figure 24, the distribution of the electro-conductive material in the resin is randomly made by providing the curved portion in relation to the injection direction of the resin 119f, and changing the transverse shape of the flow passage. That is, the electro-conductivity injected from the electrode portion 119d in the direction of the arrow 119f is divided into two portions at the junction point 119c. One is bent twice as indicated by arrow 119h to form the charging contact portion 119b. The other is curved twice, as indicated by arrow 119i, to form the exposed contact portion 119a. Furthermore, as shown in (b) to (e) in Figure 24, the transverse shape of the connecting portion 119c is a round shape. On the other hand, the cross sections of the loading contact portion 119b and the exposed contact portion 119a are a rectangle and are larger in cross-sectional area than the cross section of the connecting portion 119c. With this, as described above, the distribution of the electro-conductive material in the resin is randomised, to improve the electro-conductive property between the charging contact portion 119b and the exposed contact portion 119a.
[0116] Furthermore, by also employing a constitution in which the charging contact portion 119b and the exposed contact portion 119a are provided in remote positions, from the port portion 119d, there is an electro property improvement effect. -conductive. In general, there is a tendency for the electro-conductive material in the resin to be concentrated at a position (a central portion of the transverse shape) where the cooling of the resin is slow and is reduced at the surface portion in the cooling stage, from from the injection of electro-conductivity into the space where the electro-conductive resin is constituted with the mold, until the mold product is completed. For this reason, for example, in a shape such as one in which the same transverse shape extends in the direction of resin injection, the electro-conductive material sinks into the transverse central portion, at any position in a longitudinal direction, from so that the electro-conductive material is reduced on the surface and thus the resistance value tends to become high. Furthermore, the vicinity of the port portion 119d is the region through which the electro-conductive resin always passes, and thus the cooling of the electro-conductive resin in the region is slow, so the tendency is for the electro-conductive material is concentrated in the central transverse portion. In this way, the loading contact portion 119a and the exposed contact portion 119b are disposed on a downstream side of the flow passage, when the resin port portion 119d is located upstream of the resin flow passage. This will be described using model 38 in (a) of Figure 27. This model 38 is formed of the same material as the electro-conductive resin 34 described in other figures. In this model, a gate is set at 38a and a measurement point is set at three positions at a distance. As shown in (b) of Figure 27, when the electrical resistance value is measured at the positions of the three measurement points 138b, 138c and 138d, from the position of port 38a, compared to that of point 138b, the values of electrical resistance at points 138c and 138d are low. In this way, the value of electrical resistance is lower when a certain distance from the port portion 119d is kept.
[0117] As described above, the electro-conductive property can be improved by providing a curved portion for the electrode portion 119, or by modifying the transverse shape of the flow passage and thus to change the state of the distribution of the electro-conductive material. Furthermore, also employing a constitution in which the loading contact portion 119b and the exposed contact portion 119a are provided at remote positions from the port portion 119d, and the resin is injected from the port portion 119d is branched from the intermediate portion to provide both contact portions 119a and 119b, the effect of improving the electro-conductive property is achieved. Constitution of the electrode retention portion
[0118] Next, using Figure 15, Figure 23 and Figure 24, the constitution of a retention portion of the electrode 119 relative to the structure of the drum 113 will be described.
[0119] The portion of the electrode 119 is formed by injecting the electro-conductive resin into the flow passage 113c, which is a tunnel-shaped hole provided in the structure of the drum 113, as described above. As shown in Figure 24, electrode portion 119 has curved portions, as indicated by arrows 119i and 119h, inside drum structure 113. In this way, electrode portion 119 is not moved in the longitudinal direction (direction N shown in Figure 15) of the drum frame 113 and in the direction perpendicular to the N direction, relative to the drum frame 113. In addition, the electrode portion 119 is regulated by a base 119j of the 119a shown in (a) of Figure 24 and by a peripheral surface of the flow passage 113a, shown in Figure 23. With this, the electrode portion 119 is prevented from moving in the width direction (direction 119f, shown in Figure 24 or its opposite direction) or from rotating, with the first connecting portion 119c as a rod. In employing such a constitution, even when an impact is applied to the processing cartridge B, during transport or in similar circumstances, the problem of the electrode portion 119 being detached from the drum frame 113 or floating from the drum frame 113, does not occur. Furthermore, in case a plurality of contact portions are needed, a resin escape path can be formed in a branched way, so that the formation of the complicated contact portions is allowed, and it is possible to improve the design latitude. of the electro-conductive path. Furthermore, in case a port portion 119d is provided on an upstream side of the injection direction, the electro-conductive property of the electrode portion 119 is improved by providing the contact portions 119a and 119b on the downstream side of the flow passage. Furthermore, in the conventional embodiment, there was no need to provide the injection port for mounting the electrode portion with the frame and the hole; the cut-out portion and the like, to position and thus it was feared that the strength of the cartridge structure would be reduced. On the other hand, according to the present invention, the electro-conductive resin is injected into a hole or the like, in the structure of the drum 113 in this way, this hole can be filled with the resin, so that it is possible suppress the reduction in the strength of the drum structure.
[0120] Furthermore, in case a conventional metal plate contact was used, a mounting portion to allow mounting of the metal plate contact to the frame was required. On the other hand, when the constitution of this embodiment is used, when an anchor shape is provided, as part of the shape into which the electro-conductive resin is to be injected, the retention function can be performed without providing the anchor portion. retention, and in this way it is possible to reduce the excess space in which the retention portion is provided.
[0121] Furthermore, on the other hand, in this embodiment, the molding is done by following the flow of the electro-conductive resin into the structure directly, and thus, when compared to the case of the electrode member, as a separate member, being mounted with the frame, operability is improved.
[0122] Furthermore, when the metal plate contact is assembled, the tolerance of the components, or the assembly tolerance, of the respective parts is generated, and thus the positional accuracy of the contact with the metal plate, in relation to structure, it is reduced. On the other hand, in this embodiment, the electro-conductive resin is floated directly inside the structure to carry out the molding, so that the positional accuracy in relation to the structure is improved. buffer portion
[0123] Next, using Figure 13, Figure 14 and Figure 29, the damping portion 132 will be described. Figure 29 includes illustrations showing a position of the damper portion 132. Part (a) of Figure 29 is a perspective view showing the state in which the mold 127 is in contact with the frame of the barrel 113. Part (b) of Figure 29 is a schematic view of the state in which the drum structure 113 and the mold 127 come into contact as seen in the direction of the arrow (direction perpendicular to a contact surface of the contact portion for loading 119b with the compression spring 122a) shown in (a) of Figure 29.
[0124] As shown in Figure 13 and in (b) of Figure 29, in the drum structure 113, in the vicinity of the contact portion for loading 119d, the damping portion 132 is provided. As shown in Figure 13 and in (b) of Figure 29, specifically, a spacing between the mold injection port 113g, the spring bearing surface forming portion 113b of the drum frame 113, and the projection 127b, when projection 127b of mold 127 is injected, when charging contact portion 119b is molded, it becomes damping portion 132. When electrode portion 119 is molded, by increasing the amount of resin injection, relative to space upon injection, the extruded portion 119b2 of excess electro-conductive resin, from the periphery of the exposed contact portion 119a, is formed; as described above. This extruded portion 119b2 is formed to reliably mold the shapes of the exposed contact portion 119a and the loading contact portion 119b. This damping portion 132 is the space that allows the formation of this extruded portion 119b2.
[0125] In addition, the damping portion 132 is provided within the barrel structure 113. For this reason, the extruded mold 119b2 is prevented from being touched by the user from outside the processing cartridge B and thus is not curved or released by user touch.
[0126] Incidentally, in this embodiment, the damping portion 132 was provided in the vicinity of the contact portion for loading 119d. However, the damping portion 132 is not limited to the one described herein, but may also be provided in an intermediate portion of the resin injection path. Constitution of the adjustment of the position of the loading roller compression spring.
[0127] Next, using Figure 30 and Figure 31, the constitution of the adjustment of the compression spring position, to force the loading roller 118 against the photosensitive drum 107, will be described.
[0128] Figure 30 and Figure 31 are views showing the constitution of the structure for adjusting the position of the compression spring 112a. Part (a) of Figure 30 is a perspective view of the external aspect of the drum frame 113 when a cover member 117 is mounted on the drum frame 113 on a longitudinal end side. Part (b) of Figure 30 is the view from the outside of when the barrel structure 113 is viewed from the direction of the arrow shown in (b) of Figure 30. Part (c) of Figure 30 is a sectional view. when the structure of the drum 113 is cut along the line UU, shown in (b) of Figure 30. Part (d) of Figure 30 is a view of when the structure of the drum 113 is viewed from the direction of the arrow shown in (b) of Figure 30. In the figure of (d) of Figure 30, the photosensitive drum 107, the loading roller 118, and the loading bearing 123a are not shown.
[0129] The compression spring 122a contacts the loading contact portion 119b, but the loading contact portion 119b has a flat surface and, therefore, the compression spring 122a cannot be directly positioned with respect to the charging contact portion 118b. The reason why the loading contact portion 119b has a flat surface shape is that the loading contact portion 119b is prevented from forming an undercut when the mold 127 is separated from the drum frame 113. the compression spring 122a with respect to the drum frame 113, the drum frame 113 is provided with adjustment surfaces 113i and 113j. By these, an outer periphery of the compression spring 122a is regulated while leaving one direction. The remaining direction is regulated by a cover regulating portion 117a provided with a cover member 117, to be mounted on the drum frame 113, after the compression spring 122a is mounted on the drum frame 113. compression spring 122a is positioned relative to the barrel frame 113.
[0130] Next, another constitution other than the constitution of Figure 30 will be described using Figure 31. Part (a) of Figure 31 is a perspective view of the external aspect of the drum structure 113 when the cover member 117 is mounted on the drum frame, 113 on a longitudinal end side. Part (b) of Figure 31 is a view of the external appearance, when the drum structure 113 is viewed from the direction of the arrow shown in (b) of Figure 31. Part (c) of Figure 31 is a sectional view. when the structure of the drum 113 is cut along the line UU, shown in (b) of Figure 31. Part (d) of Figure 31 is a view of when the structure of the drum 113 is viewed from the direction of the arrow shown in (b) of Figure 31. In the figure of (d) of Figure 31, the photosensitive drum 107, the loading roller 118, and the loading bearing 123a are not shown.
[0131] The structure of the drum 113 is provided with adjustment surfaces 113i and 113j, to position the compression spring 122a. The adjustment surfaces 113i, 113k, 113l and 113j adjust the outer diameter portion of the compression spring 122a with respect to the height direction. The reason why the outer peripheral portion of the compression spring 122a is set at different heights is that there is a need to provide the barrel structure 113 with an injection mold port 113g, into which the projection 127b of the mold 127 must be injected, in view of shaping with the mold during molding of the drum frame 113. By employing such a constitution, the positioning of the compression spring 122a can be accomplished by the one-piece, i.e., the drum frame 113.
[0132] In both Figure 30 and Figure 31, the adjustment surface 113i is a straight line, but it may also have an arcuate shape, similar to the outer diameter portion of the compression spring portion 122a. Furthermore, surfaces 113j and 117a may similarly have an arcuate shape. Other modes of realization
[0133] Furthermore, the electrode portion, in this embodiment, electrically connects the charging roller 118 and the main assembly electrode 121 in the drum unit D, but the present invention is not limited thereto. The electrode portion can further electrically connect, for example, the photosensitive drum 107 and the imaging apparatus main assembly A, to the drum unit D. Furthermore, the electrode portion can also be provided correspondingly , for each photosensitive drum 107 and charging roller 118. That is, the contact portion, for electrically connecting the charging roller 118 and the imaging apparatus main assembly A, and the contact portion, for electrically connecting the photosensitive drum 107 and imaging apparatus main assembly A may also be provided. Furthermore, the loading roller 118 and the contact portion, and the photosensitive drum 107 and the contact portion can also be, respectively, similar to the above described, constituted so as to be electrically connected by means of the spring of compression 22, or directly.
[0134] Furthermore, this embodiment has been described using drum unit D, but the electrode portion can also be applied to developing unit C. Figure 32 is an illustration of when a portion electrode 126 is molded with the electro-conductive resin 134, relative to the developing structure 108. As the electrode portion 126, an exposed contact portion 126a to be electrically connected with the main assembly, and a developing contact portion 126bb, are formed by injecting the electro-conductive resin 134 from an injection receiving portion (port portion) 126a and branching the flow path into the trunking portion 126a. The developing contact portion 126bb comes into contact with the member which forces the developing roller 125. Thereby, the main assembly of the apparatus and the developing roller 112 are electrically connected by means of a portion of the developing contact portion of the main assembly 126a, developing contact portion 126bb, developing roller forcing member 125, a developing roller support portion 124 and a developing roller metal core 112b.
[0135] Incidentally, in this embodiment, the developing roller 112 is illustrated, but even the toner supply roller 116 can also be electrically connected with the main assembly using a similar constitution. Furthermore, if the electrode portion is applied to this processing cartridge B2, the electrode portion can also be provided, in a plurality of electrode portions, correspondingly, in each of the electrophotographic photosensitive drums and in a plurality of materials of record. In this case, with regard to the plurality of contact portions, there is a need to provide each contact portion with an injection port through which the electro-conductive resin 134 is to be injected. However, a constitution in which a single injection port is provided and branched from an intermediate portion of the flow passage to cause the electro-conductive resin 134 to flow into a plurality of contact-forming portions, to mold each contact portion, it can also be employed.
[0136] In this embodiment, the electrode portion is provided for the developing structure 108, but the contact portion may also be provided for a support member, to support the developing roller 112 and the supply roller. toner 116. Also the electrical connection for the contact portion in the constitution of the electrophotographic photosensitive drum and the plurality of processing means can be constituted, similarly to the above, to be made by means of the compression spring 125, or directly.
[0137] In addition, in this embodiment, the polyacetal containing about 10% of carbon black, as an electro-conductive material, is used for the portion of the electrode 119. In the fundamentals of the use of carbon black, it is intended minimize damage (by abrasion or the like) to the device being manufactured, but carbon fibers and other metallic-based additives, or the like, can also be used.
[0138] As described above, according to this embodiment, compared to the conventional embodiment, when the plurality of contact portions is necessary, the escape distance, or the spatial distance, can be ensured by the thickness tunnel shape and thus the escape path of the electrode portion is simplified.
[0139] In addition, the electro-conductive resin is injected into the structure, to prepare the cartridge provided with the electrode portion, to electrically connect the main assembly contact and the processing medium, and thus it is possible achieve simplification of the constitution of the structure and electrode portion, and improvements in the cartridge mounting property, and in the electro-conductive property of the electrode portion. industrial applicability
[0140] According to the present invention, the cartridge provided with the electrode portion, formed by injecting the electro-conductive resin into the structure, to electrically connect the main assembly contact and the processing medium, it is possible to achieve simplification of the constitutions of the structure and of the electrode portion, and improvements in the mounting property of the cartridge, and in the electro-conductivity property of the electrode portion.

权利要求:
Claims (19)
[0001]
1. Cartridge (B) detachably mounted in an apparatus main assembly (100) of an imaging apparatus, comprising: (i) a processing means (12, 16) for performing imaging; (ii) a structure (13) for supporting said processing means (12, 16); and (iii) a cartridge electrode (19) molded integrally with said structure (13) by injecting an electroconductive resin into said structure (13), wherein said cartridge electrode (19) comprises: a first portion of contact (22), which is exposed to an exterior of said structure (13) and which is in contact with a main assembly contact provided in the apparatus main assembly (100), when said cartridge (B) is mounted in the main assembly of the apparatus (100); a second contact portion (20) provided to be electrically connected with said processing means (12, 16); and an injection receiving portion (G) from which resin is injected into said structure (13), when said cartridge electrode (19) is molded, characterized in that the electroconductive resin is injected from said injection receiving portion (G) is branched to mold said first contact portion (22) and said second contact portion (20) so that an electroconductive path, for electrically connecting the main assembly contact with said processing means (12, 16) is formed and so that said first contact portion (22) is arranged not to overlap with said injection receiving portion (G) when viewed in a direction perpendicular to a surface of said cartridge electrode (19) on which said injection receiving portion (G) is provided.
[0002]
2. Cartridge according to claim 1, characterized in that said first contact portion (22) and said second contact portion (20) are formed from electroconductive resin modified in the direction of flow to a direction other than starting from a direction in which the electroconductive resin is injected into that of said injection receiving portion (G).
[0003]
3. Cartridge according to claim 1, characterized in that said second contact portion (20) is formed by passing the electroconductive resin injected into said injection receiving portion (G) through a flow passage provided in said structure (13).
[0004]
4. Cartridge according to claim 3, characterized in that the electroconductive resin is curved within said structure (13).
[0005]
5. Cartridge according to claim 1, characterized in that said second contact portion (20) is formed from the electroconductive resin injected into a space between an insert mold, inserted from the outside of said structure ( 13) when said cartridge electrode (19) is integrally molded in said structure, and said structure (13).
[0006]
6. Cartridge according to claim 1, characterized in that said first contact portion (22) is formed by passing the electroconductive resin injected into said injection receiving portion (G) through a flow passage provided in said structure.
[0007]
7. Cartridge according to claim 6, characterized in that the electroconductive resin is curved within said structure (13).
[0008]
8. Cartridge according to claim 1, characterized in that said first contact portion (22) is formed from the electroconductive resin injected into a space between a mold, in contact with said structure (13) when said cartridge electrode (19) is integrally molded in said frame (13), and said frame (13).
[0009]
9. Cartridge according to claim 1, characterized in that said cartridge electrode (19) includes a connecting portion for connecting said injection receiving portion (G) and said first contact portion (22 ), and to connect said injection receiving portion (G) and said second contact portion (20), and wherein a cross-sectional area, relative to a direction perpendicular to a direction in which the resin stops said first contact portion (22) and said second contact portion (20) is injected, is greater than a cross-sectional area relative to a direction perpendicular to a direction in which the resin for said connecting portion is injected.
[0010]
10. Cartridge according to claim 9, characterized in that said connecting portion includes a first connecting portion for connecting said first contact portion (22) and said injection receiving portion (G), and a second connecting portion, branching from an intermediate portion of said first connecting portion to connect said second contact portion (20) and said first connecting portion.
[0011]
11. Cartridge according to claim 1, characterized in that said second contact portion (20) is exposed from said structure (13) in relation to a direction crossing a direction in which said first portion contact (22) is exposed from said structure (13).
[0012]
12. Cartridge according to claim 1, characterized in that it further comprises an electroconductive member to be contacted to said second contact portion (20) to be electrically connected to said processing means (12, 16).
[0013]
13. Cartridge according to claim 12, characterized in that said electroconductive member is a spring member for urging said processing means (12, 16), and an outer diameter portion of said electroconductive member is regulated by the said frame (13) and a cover member mounted on said frame (13) and is thus positioned for said second contact portion (20).
[0014]
14. Cartridge according to claim 1, characterized in that said processing means (12, 16) is a charging member (16) for electrically charging an image support member (12).
[0015]
15. Cartridge according to claim 1, characterized in that said processing means (12, 16) is a developing member for revealing an electrostatic latent image formed on an image support member (12).
[0016]
16. Cartridge according to claim 1, characterized in that said structure (13) includes a damping portion to allow the extrusion of the electroconductive resin from a region in which said cartridge electrode (19) is formed.
[0017]
17. Cartridge according to claim 16, characterized in that said damping portion is provided within said structure (13).
[0018]
18. A cartridge according to claim 1, characterized in that said cartridge (B) is a process cartridge including an image support member (12) on which an electrostatic latent image will be formed and said means of processing (12, 16) is operable on said image support member (12).
[0019]
19. A cartridge according to claim 1, characterized in that said cartridge (B) is detachably mounted in a color imaging apparatus for the formation of a color image.

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同族专利:

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公开号 | 公开日

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US9367025B2|2016-06-14|

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KR101488119B1|2015-01-29|

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US20160257041A1|2016-09-08|

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RU2013112315A|2014-09-27|

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EP2607966A4|2015-10-28|

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US20150037065A1|2015-02-05|

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JP2012063750A|2012-03-29|

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EP2607966A1|2013-06-26|

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RU2529770C1|2014-09-27|

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CN103069346B|2015-11-25|

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BR112013003888A2|2016-07-05|

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CN105242510A|2016-01-13|

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US9688008B2|2017-06-27|

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KR20130045923A|2013-05-06|

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EP3575883A1|2019-12-04|

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CN103069346A|2013-04-24|

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EP2607966B1|2020-01-08|

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JP4846062B1|2011-12-28|

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US8879944B2|2014-11-04|

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CN105242510B|2019-11-19|

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WO2012023633A1|2012-02-23|

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MY167542A|2018-09-05|

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US20130022368A1|2013-01-24|

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法律状态:
2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-10-29| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-09-29| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|

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2021-02-09| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2021-06-01| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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2021-06-15| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-08-31| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 19/08/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2010185147|2010-08-20|

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JP2010-185147|2010-08-20|

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JP2011160155A|JP4846062B1|2010-08-20|2011-07-21|Cartridge and image forming apparatus|

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JP2011-160155|2011-07-21|

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PCT/JP2011/069237|WO2012023633A1|2010-08-20|2011-08-19|Cartridge and image-forming apparatus|

---