• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1526796 Applying potential to xerographic developer XEROX CORP 29 Oct 1975 [24 Feb 1975] 44601/75 Heading B2L In a xerographic developer, wherein latent images are formed on an insulating surface overlying a conductive backing held at a reference potential, e.g. earth, an electrostatic field uniform across the image surface but non-uniform along it is produced by an electrode comprising a body rotatable about an axis parallel to the width of the image surface and comprising a resistive medium 26, 27 having a plurality of elongate axial conductors 24 engaged therewith, and a plurality of stationary contacts 25 spaced about said axis and connected to bias sources for supplying voltage to conductors 24. The rotatable body 22 may be the brush cylinder of a magnetic brush; the contacts 25 may directly contact conductors 24 as shown, or an insulating sleeve of lower resistivity than coating 27 but rotatable therewith may be interposed between 24 and 25 (as in Fig. 4, not shown). The potentials applied before, at, and after the development "nip" may correspond to less than the background potential, a potential between the back ground and image potentials, and a potential above the image potential respectively, to urge toner particles away from sleeve 22, assist development, and prevent post-development powder clouds respectively.
    公开号:SU917713A3
    申请号:SU752301294
    申请日:1975-12-24
    公开日:1982-03-30
    发明作者:Джин Паркер Дэлмер；Луис Скалетта Джозеф
    申请人:Ксерокс Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to electrophotographic copying, in particular to devices with a system for developing a latent image of the type 'magnetic brush'. 5
    Electrophotographic photocopiers are widely known in which a manifestation system of the 'type' magnetic brush 'C1] and [2] is implemented.
    The closest solution to the proposed technical essence and the achieved result is an electrophotographic photocopier containing an electrophotographic image carrier, charging, exposure, transfer, fixing, cleaning and developing units of the 'magnetic brush' type with a rotating developing roller serving as an electrode to which bias voltage is applied [2J. 20
    A disadvantage of the known electrophotographic photocopier is the low quality of the manifestation due to the presence of the 'edge effect' and the incomplete elimination of the manifestation of the background. 25
    The purpose of the invention is the improvement of the development process by obtaining a developing electrostatic field, constant across the width of the development zone and smoothly varying along the length of the development zone, which positively affects the quality of the copies.
    To achieve this goal in the known electrophotographic copying machine containing an image electrophotographic carrier, charging units, exposure, transferring, fixing t purification and expressions of type "magnetic brush" with a rotating developing roller, on the surface of the developing roller at certain intervals parallel to the axis of stacked conductors and around the circumference of the roller with mixing relative to each other are fixed conductive elements connected to sources of different voltages th mixing, and the conductors are in sliding contact with the conductive elements, while at least
    917713 4 at least part of the surface of the roller along its length is covered with resistive material.
    In this case, the conductive elements are located on the ring resistive element mounted with the possibility of 5 sliding contact with the conductors, and each conductive element is in contact with at least one conductor ..
    In FIG. 1 schematically shows an electric photographic photocopier, a general view of a sectional view; in FIG. 2 shows a developing roller, a part of the surface of which is coated with a resistive material; · in FIG. 3 - part of the developing roller, 15 cross-sectional view, ·· of FIG. 4 - developing roller in combination with an annular resistive element for connecting conductive elements disposed thereon with the conductors, by about 2 skolzya- conductive contact.
    The electrographic apparatus contains an electrophotographic image carrier 1, made in the form of a drum coated with a photoconductor layer 25 2, a hopper 3 with a developer 4, which is added as a consumption by a dispenser 5, showing a roller 6, on the surface of which with a certain interval parallel to its axis 30 of the wife’s conductors 7, and around the circumference of the roller - conductive elements 8 located on the ring resistive element 9 installed by means of a sliding contact with the conductors 7. 35
    A part of the surface of at least the developing roller 6 is coated with resistive material 10. A permanent magnet 11 is located inside the developing roller 6. The developing roller is adjacent to the developing zone 12.
    Resistive material 10 has a high coefficient of friction, which allows the developing roller to efficiently transport the developing mixture 4. Resistive material 10 45 is a conductive rubber with a carbon black additive that provides a resistance of 1O 7 -10 ^ Ohm. The thickness of the resistive material is 0.254-0.635 mm. This material 10 provides not only a 50 to 50 coefficient of friction, but also the path of neutralizing currents necessary to neutralize the total charge of the developer when bends are removed from it. In the process, each— '. The 55th conductor 7 is an equipotential surface, and in the corresponding section of the resistive material 10 there is a potential difference caused by bias voltages that are applied to adjacent conductors.
    In accordance with this, the interval between adjacent conductors 7 should be such a value as to exclude the possibility of the formation of an electric arc or dangerous local overheating of the resistive material 10 in the case of the greatest potential difference between adjacent conductors.
    A part of each of the conductors 7 remains free of resistive material 10 to provide direct, direct contact with the stationary conductive elements 8. In this case, each stationary conductive element 8 has an overlap in the interval between adjacent conductors 7, so that each of the stationary conductive elements 8 interacts with at least one conductor 7.
    In the case where the contact between the conductive elements 8 and the conductors 7 is established through the resistive element 9, the latter should be uniform and have a relatively low resistance, so that the bias voltage supplied to the conductors 7 is set essentially independently of the resistive material 10.
    !
    The device operates as follows.
    The latent image obtained on the electrophotographic medium 1 of the image is essentially divided into sections having nominal potentials of approximately 800 and 200 V, respectively. Depending on this, the required bias voltage levels of the conductors 7 are determined in the areas of capture, capture, and after capture of the development zone 12. The conductors in the capture area at any given time should have a preferred bias voltage of 250-300 V, so that the possibility of the manifestation of white areas and not. has a significant impact on the process of manifestation of a latent image. Conductors 7 passing through the pre-gripping zone 6 during rotation of the developing roller 6 should be predominantly offset by a voltage of 100 V or close to it, whereby the developing mixture 4 is opened from the developing roller 6 and the developer 4 migrates to the developing zone 12. Conductors 7 which, when the developing roller 6 rotates below the developing zone 12, can undergo voltage displacement up to 1 ° C, whereby the particles of the 5 developing mixture 4 are attracted to the developing roller 6, which eliminates the unwanted emission of the bend cloud. The bias stresses change gradually and smoothly, which is provided by the 10 gradient of the voltage generated by the resistive material 10 and positively affects the quality of the manifestation.
    权利要求:
    Claims (2)
    [1]
    least part of the surface of the roller along its length is covered with resistive material. In this case, the conductive elements are located on an annular resistive element installed with the possibility of sliding contact with the conductors, and each conductive element is in contact at least one with one conductor. In FIG. 1 schematically depicts an electrophotographic copying agashrat, a general view in section; in fig. 2 is a developing roller, part of the surface of which is covered with resistive material in FIG. 3 — the part of the developing roller, a cross-section; in FIG. 4 shows a developing roller in combination with an annular resistive element for connecting wire elements located on it with conductors by means of a sliding contact. The electrographic apparatus contains an electrophotographic carrier 1 of the image, made in the form of a drum covered with a photo semiconductor layer 2, a hopper 3 with a developer 4, which as it consumes is added using a dispenser 5, the developing roller 6 on the surface of which with a certain interval parallel to its axis The conductors 7 were dispersed, and along the roller circumference - the conductive elements 8, located on the ring resistive element 9, installed by means of sliding contact with the conductors 7. Part of the surface along at least the developing roller 6 is covered with resistive material 10. Inside the developing roller 6 there is a permanent magnet 11. The developing roller is located adjacent to the zone 12 of the manifestation. The resistive material 10 has a high friction coefficient, which allows the developing roller to efficiently transport the piercing mixture 4. The resistive material 10 is a conductive rubber with a carbon black additive that provides resistance. The thickness of the resistive material is 0.254-0.635 mm. This material Y provides not only the coefficient of friction, but also the path of neutralizing currents necessary to neutralize the total charge of the developer when it turns off the turn signals. During operation, each conductor 7 is an equipotential surface, and a potential difference occurs at the corresponding portion of the resistive material 1O, caused by bias voltages that are applied to adjacent conductors. In accordance with this, the interval between adjacent conductors 7 must be of such magnitude as to exclude the possibility of electric arcing or dangerous local overheating of the resistive material 10 in the case of the greatest potential difference between adjacent conductors. Part of each of the conductors 7 remains free of resistive material 1O. provide directly. contact with stationary conductive elements 8. In this case, each stationary conductive element 8 has an overlap in the spacing between adjacent conductors 7, so that each of the stationary conductive elements 8 interacts with at least one conductor 7. In the case where the contact between conductive elements 8 and conductors 7 is installed through a resistive element 9, the latter must be uniform and have a relatively low resistance, so that the bias voltage. supplied to conductors 7 are installed essentially independently of the resisive material 1O. The device works as follows. The latent image obtained on the electrophotographic image carrier 1 is essentially divided into areas having nominal potentials of about 800 and 200 V, respectively. Depending on this, the required voltage levels of the displacement of the conductors 7 in the under-grip, capture and after the capture zone 12 of the manifestation are determined. The conductors in the gripping area at any given point in time should have a preferred bias voltage of 250-300 V, so that the possibility of space gaps and not occurrence is eliminated. has a significant effect on the process of developing a latent image. The conductors 7, which pass through the rotation of the developing roller 6 through the pre-grip area, should be predominantly displaced by or close to 100 V, whereby the developing mixture 4 opens from the developing roller 6 and the migration takes place. pro-kel 4 in zone 12 of manifestation. The conductors 7 which, when the developing roller 6 rotates, pass below the manifestation zone 12, may be subjected to voltage mixing up to 1000 V, as a result of which the developing mixture 4 particles attract the developing roller 6, which eliminates undesirable emission clouds turn. The variation of the bias voltage occurs gradually and smoothly, which is provided by the voltage gradient formed by the resistive material 10 and has a positive effect on the quality of the manifestation. Claim 1. Electrophotographic copier containing an electrophotographic image carrier. Charging, exposing, transferring, fixing, peeling, and developing type magnetic brush with a rotating developing roller, characterized in that, in order to improve the appearance process , on the surface of the developing roller with a certain interval parallel to its axis, conductors are laid, and around the circumference of the roller with an offset relative to each other, fixed conductive elements are mounted, connected e sources razlichnyhnapr zheny offset, and the conductors are in sliding contact with the conductive elements, wherein at least part of the surface along the length of the roller is coated with resistive material. 2. An apparatus according to claim 1, characterized in that each conductive element is in contact with at least one conductor. 3. The apparatus according to claim 1, characterized in that the conductive elements are located on an annular resistive element that is installed with the possibility of sliding contact with the conductors. Sources of information taken into account in the examination 1. USSR patent number 383388, cl. C 03 C 15 / O6, published 1973
    [2]
    2. Patent of the USSR No. 4О2245, cl. С ОЗ С 15 / О6, published. 1974.
    (rig. 2. FIG.
    类似技术:
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    同族专利:
    公开号 | 公开日
    JPS51104835A|1976-09-17|
    CA1070940A|1980-02-05|
    NL7514878A|1976-03-31|
    US3996892A|1976-12-14|
    DE2555803A1|1976-09-02|
    GB1526796A|1978-09-27|
    FR2301851A1|1976-09-17|
    JPS5918706B2|1984-04-28|
    DE2555803B2|1979-03-08|
    DE2555803C3|1979-10-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2987037A|1955-12-21|1961-06-06|Ibm|Xerographic printer|
    BE626526A|1961-12-27|
    US3358594A|1966-01-17|1967-12-19|American Can Co|Electrostatic printing with a magnetic brush feed|
    US3611992A|1969-07-03|1971-10-12|Xerox Corp|Cleanup electrode|
    US3759222A|1971-03-04|1973-09-18|Xerox Corp|Microfield donor with continuously reversing microfields|
    US3805739A|1971-06-11|1974-04-23|Xerox Corp|Controlling multiple voltage levels for electrostatic printing|
    US3818864A|1971-09-14|1974-06-25|Xerox Corp|Image developing apparatus|
    US3865080A|1973-01-17|1975-02-11|Xerox Corp|Toner pickoff apparatus|
    US3884185A|1973-09-06|1975-05-20|Xerox Corp|Coated wire developer brush|JPS5442143A|1977-09-01|1979-04-03|Olympus Optical Co Ltd|Electrophotographic method|
    AU3829378A|1977-11-10|1980-01-31|Ibm|Cuprous-nickel magnetic brush roll|
    JPS6331778B2|1979-07-16|1988-06-27|Canon Kk|
    US4292923A|1979-07-16|1981-10-06|Xerox Corporation|Development system|
    DE3043040C2|1979-11-14|1991-02-28|Canon K.K., Tokio/Tokyo, Jp|
    US4445771A|1980-12-05|1984-05-01|Ricoh Company, Ltd.|Developing apparatus for electrostatic photography|
    DE3117296C2|1981-04-30|1984-01-19|Siemens AG, 1000 Berlin und 8000 München|Developer station for developing charge images generated on a charge image carrier|
    US4428665A|1981-11-06|1984-01-31|Xerox Corporation|Apparatus, process for removal of toner particles|
    GB2114919B|1982-02-17|1986-06-25|Ricoh Kk|A developing device|
    GB2120960B|1982-05-31|1986-10-01|Ricoh Kk|Developer device|
    US4515106A|1982-10-15|1985-05-07|Tokyo Shibaura Denki Kabushiki Kaisha|Developing apparatus|
    JPH0446428B2|1983-03-31|1992-07-29|Tokyo Shibaura Electric Co|
    US4787323A|1987-08-12|1988-11-29|Atlantic Richfield Company|Treating sludges and soil materials contaminated with hydrocarbons|
    US5504563A|1991-07-01|1996-04-02|Xerox Corporation|Scavengeless donor roll development|
    US5177538A|1991-09-27|1993-01-05|Xerox Corporation|Phenolic graphite donor roll|
    US5339142A|1992-07-30|1994-08-16|Xerox Corporation|AC/DC spatially programmable donor roll for xerographic development|
    US5268259A|1992-10-16|1993-12-07|Xerox Corporation|Process for preparing an electroded donor roll|
    JPH06149071A|1992-10-22|1994-05-27|Xerox Corp|Electrode type donor developing device|
    US5919514A|1992-12-28|1999-07-06|Xerox Corporation|Process for preparing electroded donor rolls|
    US5300339A|1993-03-29|1994-04-05|Xerox Corporation|Development system coatings|
    US5360940A|1993-07-14|1994-11-01|Xerox Corporation|Scavengeless two component development with an electroded development roll|
    US5539505A|1993-11-23|1996-07-23|Xerox Corporation|Commutating method for SCD donor roll bias|
    US5394225A|1993-11-23|1995-02-28|Xerox Corporation|Optical switching scheme for SCD donor roll bias|
    US5413807A|1994-10-17|1995-05-09|Xerox Corporation|Method of manufacturing a donor roll|
    US5515142A|1994-11-15|1996-05-07|Xerox Corporation|Donor rolls with spiral electrodes for commutation|
    US5473414A|1994-12-19|1995-12-05|Xerox Corporation|Cleaning commutator brushes for an electroded donor roll|
    US5523826A|1995-01-18|1996-06-04|Xerox Corporation|Developer units with residual toner removal to assist reloading|
    US5517287A|1995-01-23|1996-05-14|Xerox Corporation|Donor rolls with interconnected electrodes|
    US5614995A|1995-09-05|1997-03-25|Xerox Corporation|Electroded donor roll having robust commutator contacts|
    US5570169A|1995-09-25|1996-10-29|Xerox Corporation|Donor rolls with modular commutation|
    US5589917A|1995-09-25|1996-12-31|Xerox Corporation|Donor rolls with magnetically coupledcommutation|
    US5600418A|1995-09-25|1997-02-04|Xerox Corporation|Donor rolls with exterior commutation|
    US5594534A|1996-01-11|1997-01-14|Xerox Corporation|Electroded doner roll structure incorporating resistive network|
    US5592271A|1996-01-11|1997-01-07|Xerox Corporation|Donor rolls with capacitively cushioned commutation|
    US5701564A|1996-09-26|1997-12-23|Xerox Corporation|Scavengeless development apparatus including an electroded donor roll having a tri-contact commutator assembly|
    US5729807A|1997-01-21|1998-03-17|Xerox Corporation|Optically switched commutator scheme for hybrid scavengeless segmented electroded donor rolls|
    EP0867783B1|1997-03-28|2004-07-21|Xerox Corporation|A segmented electrode development roll|
    US5745827A|1997-03-31|1998-04-28|Xerox Corporation|Bundled steel wire SED communicator secondary cores|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/552,011|US3996892A|1975-02-24|1975-02-24|Spatially programmable electrode-type roll for electrostatographic processors and the like|
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