• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    Method and machine for the formation of trays or prismatic boxes by folding and joining of die-cut plates. The present invention proposes to position a bottom portion (11) of an asymmetric flat blank (10) between the mouth (21) of a mold (20) and a male (30); displacing the core by contacting a bottom plane (31) of the core (30) with the bottom portion (11) of the blank (10); actuate at least one retaining device (40) integrated in the bottom plane of the male causing the trapping of the bottom portion (11) of the blank (10) against the male (30) and insert the male through the mouthpiece (21) of the mold (20) dragging the bottom portion (11) causing the folding of the side wall portions (12) of the blank (10) in interaction with wall benders (22) integrated in the mold. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2782049A1
    申请号:ES201930204
    申请日:2019-03-06
    公开日:2020-09-09
    发明作者:Olmos Telesforo Gonzalez
    申请人:Telesforo Gonzalez Maquinaria SL；
    IPC主号:
    专利说明:

    [0001] METHOD AND MACHINE FOR FORMING PRISMATIC TRAYS OR BOXES
    [0002] Technical field
    [0003] The present invention relates generally to a method and a machine for the formation of prismatic trays or boxes by folding and joining of blanks.
    [0004] Forming machines include a core and a mold provided with a mouth surrounded by wall benders, the male being linearly movable for insertion through said mouth of the mold.
    [0005] The die-cut plates that allow the formation of trays or boxes with this type of machine consist of a series of creasing lines that determine fold lines where the die-cut plate will bend when forming the tray or box. Said score lines delimit a bottom portion surrounded by side wall portions.
    [0006] The method comprises placing the die-cut plate between the mold and the core, leaving the bottom portion aligned with the mouth of the mold, so that when the core descends, it drags the bottom portion into the mold, bending the side wall portions. in interaction with the wall benders of the mold, generating a prismatic tray or box.
    [0008] State of the art
    [0009] Forming machines for trays or prismatic boxes from a blank and including a core and a mold are widely known.
    [0010] The core includes a bottom plane, facing a mouth of the mold, and designed to drag a blank located between the core and the mold, inserting it through the mouth of the mold. Surrounding the mouth of the mold are placed wall benders that during said insertion of the die-cut plate through the mouth interact with perimeter parts of the die-cut plate, corresponding to wall portions, causing their bending with respect to a rectangular central part of the plate die-cut, corresponding to a bottom portion, thus generating a prismatic tray or box.
    [0011] It is also known to include centering lugs in the male, protruding from a bottom plane of the male facing the mouth of the mold, in collaboration with a die-cut plate provided with complementary holes with said centering lugs.
    [0012] During the linear movement of the male, the centering lugs are inserted into said holes in the blank, correctly centering the blank with respect to the male. As the male continues to move downward, it drags the stamped plate into the mold, forming the prismatic tray or box. During this movement, the centering lugs prevent a lateral movement of the die-cut plate with respect to the core, that is, an offset of the bottom portion of the die-cut plate with respect to the bottom plane of the core that could negatively affect the geometry of the tray or box. generated.
    [0013] In the case of using an asymmetric die-cut plate, typically to obtain trays or boxes with sides of different height or lacking one side, when the male pushes the die-cut plate through the mouth of the mold, the resistance that each portion opposes side wall of the die-cut sheet to its bending is different, generating asymmetric stresses. These asymmetric stresses can cause that during insertion of the blank through the mouth of the mold, the bottom portion of the blank rotates away from the bottom plane of the core, which negatively affects the final geometry of the die. tray or prismatic box obtained and which may cause the machine to block. This problem is accentuated with trays or boxes lacking on one side.
    [0014] The use of the centering pins described above does not prevent this problem, since said centering pins do not prevent the separation of the bottom portion of the blank from the bottom plane of the core.
    [0015] Document EP0022139A1 is also known, for example, which describes a plug provided with a retaining device formed by cavities connected by conduits to a suction pump.
    [0016] In this document the mentioned cavities are located in the peripheral walls of the male that act as a support against which the wall portions of the die-cut plate are pressed when the tray or prismatic box is formed, so that said retaining device can only act on the wall portions and only after the formation of the tray or box, but not before or during the process of forming the same. Therefore, the retaining devices described in this document do not allow solve the technical problem described above existing in asymmetric die-cut plates.
    [0017] Documents JP2017047635A and US2008032878A1 present similar solutions in which the male also presents, on its side walls, cavities connected by conduits to a suction pump, in this case to retain die-cut plates in position before proceeding to the formation of the tray. or box by inserting the male into the mold. These solutions are necessary when the tray or box is formed by a union of several die-cut plates. The solutions described in these documents also do not allow to solve the technical problem posed by asymmetric stamped plates.
    [0018] Brief description of the invention
    [0019] According to a first aspect, the present invention concerns a method for forming prismatic trays or boxes by folding and joining a blank provided with a bottom portion and side wall portions by means of a forming machine.
    [0020] It is understood that a die-cut plate is a flat plate of a laminar material that allows bending but has a certain rigidity, such as corrugated cardboard.
    [0021] Said die-cut plate will have a series of cuts and crease lines that will delimit different regions of the die-cut plate, said crease lines determining future folds corresponding to edges of the tray or prismatic box once formed.
    [0022] Said regions of the blank correspond to a bottom portion, typically rectangular, destined to constitute the bottom of the formed prismatic tray or box, and side wall portions destined to constitute the side walls of the prismatic tray or box once formed. The wall portions may include flaps intended to overlap other wall portions once the prismatic tray or box is formed, allowing adhesion.
    [0023] The forming machine comprises a mold with a mouth surrounded by wall benders, said mouth of the mold facing a bottom plane of a linearly movable core through said mouth of the mold.
    [0024] It will be understood that the bottom plane of the core may be a continuous flat surface, a flat frame or a plurality of coplanar partial surfaces inscribed within the area defined by said bottom plane.
    [0025] The proposed method comprises, in a manner known in the state of the art, the following steps:
    [0026] a) depositing glue lines on predefined areas of a flat die-cut plate; b) positioning the bottom portion of the flat blank between the mouth of the mold and the core;
    [0027] c) displacing the core by contacting a bottom plane of the core with the bottom portion of the blank;
    [0028] d) inserting the core through the mouth of the mold by dragging the bottom portion of the blank into the mold causing the side wall portions of the blank to fold in interaction with wall benders integrated in the mold around the mouthpiece, putting the areas with glue lines in contact with other areas of the die-cut plate, forming a prismatic tray or box.
    [0029] Thus, after positioning the die-cut plate between the core and the mold, centering the bottom portion of the die-cut sheet with the mouth of the mold and with the bottom plane of the core, the core is moved to support the bottom plane of the core. against the bottom portion of the blank, and its movement is continued by inserting the blank into the mold.
    [0030] Surrounding the mouth of the mold there are wall benders, which typically consist of curved slip surfaces that determine a transition from a plane parallel to the bottom plane of the core to a plane perpendicular to said bottom plane of the core.
    [0031] When inserting the die-cut plate into the mold, the wall portions come into contact with the wall benders, slipping by the aforementioned curved slip surface causing the die-cut plate to fold along the corresponding crease line gradually tilting the custom wall portion that the core is inserted into the mold until it is in an upright position with respect to the bottom portion of the blank, typically perpendicular thereto.
    [0032] There may be different wall benders at different heights, causing the folding of different wall portions, or different flaps, at different times of the insertion of the male into the mold, determining that some wall portions or some flaps are above others wall portions or flaps in the completed prismatic tray or box.
    [0033] The size and shape of the bottom portion of the blank, of the mouth of the mold, and of the bottom plane of the core shall be configured to be complementary, the bottom portion being equal in size to or less than the mouth of the mold, and the bottom plane of the core being equal to or smaller than the bottom portion.
    [0034] Ideally, the bottom plane of the core will be smaller than the mouth of the mold, the difference in size being, for example, a few millimeters, preferably said difference in size being equal to the thickness of the side walls of the tray or prismatic box formed, having also take into account the possible thicknesses of flaps superimposed on said walls.
    [0035] In this type of machine, the size of the mouth of the mold and the size of the bottom plane of the core can be adjustable to adapt to different shapes of trays or prismatic boxes to be formed.
    [0036] The method of the present invention further proposes that, in a way not known in the existing state of the art:
    [0037] • the die-cut plate is an asymmetric die-cut plate;
    [0038] • between steps c) and d) a retaining step is included that comprises actuating at least one retaining device integrated in the bottom plane of the core causing the bottom portion of the blank to be trapped against the core; and that
    [0039] • the retaining device maintains retention of the bottom portion during step d).
    [0040] It will be understood that an asymmetric blank will produce, when inserted into the mold, also asymmetric stresses that can cause inappropriate displacement of parts of the blank during formation of the prismatic tray or box.
    [0041] In order to avoid possible inappropriate movements of the blank during the process of forming the tray or prismatic box, it is proposed that, after the bottom plane of the core comes into contact with the bottom portion of the blank, and before the male produces the complete insertion of the die-cut plate into the mold, a retaining device located in the bottom plane of the male is actuated producing the anchoring and fixation of the bottom portion of the die-cut plate against the bottom plane of the male, trapping it preventing any relative displacement. The retaining device will maintain said retention during the process of inserting the core into the mold for the formation of the tray or prismatic box, preventing undue misalignments from occurring during said process.
    [0042] According to an embodiment of the present invention, it is proposed that during step c) one or more cavities integrated in the bottom plane of the core and provided with a coplanar opening with said bottom plane of the core, are in close contact with and sealed by the bottom portion of the blank, and where the retention stage it comprises applying air at low pressure into said one or more cavities causing the bottom portion to be trapped against the core by suction.
    [0043] In other words, it is proposed that the retaining device comprise one or more cavities in the manner of suction cups or bells that include an opening coplanar with the bottom plane of the core so that, by supporting the bottom plane of the core against the bottom portion of the core. the blank, said openings are pressed against the bottom portion sealing the cavities. The application of a certain level of vacuum in said cavities by means of a system of conduits and by means of a suction device will cause the fixing of the bottom portion against the bottom plane of the core, preventing any relative displacement while maintaining said partial vacuum.
    [0044] According to one embodiment, said cavity can cover practically the entire bottom plane of the core, said cavity being surrounded by a frame. Alternatively they can be several suction cup shaped cavities distributed over the bottom plane.
    [0045] Alternatively or additionally, it is proposed that during step c) one or more centering lugs, constituting said retaining device, integrated and protruding from the bottom plane of the core, pass through complementary holes provided in the bottom portion of the die-cut plate, and where the retention stage comprises actuating an expansive device integrated in said one or more centering lugs.
    [0046] In other words, it is proposed that the trapping of the bottom portion be produced by means of a retaining device constituted by centering lugs protruding from the bottom plane of the core. Said centering studs are inserted into complementary holes provided in the bottom portion of the die-cut plate during step c), producing the correct centering, and subsequently an expansive device integrated in the centering studs is actuated, preferably in a distal portion of said studs. centering pins, causing expansion of the centering pins.
    [0047] Preferably said expansive device increases the size of at least the distal portion of said one or more centering lugs to a size greater than that of the holes provided in the bottom portion of the blank, preventing the extraction of the centering lugs from the corresponding holes. of the blank plate in which they are inserted, holding the blank against the male.
    [0048] Alternatively, said centering lugs may include a lateral projection on their distal portion. The retention step will comprise moving one or more centering lugs in a direction parallel to the bottom plane of the male, causing a displacement of the centering lug (s) with respect to the corresponding hole, leaving the lateral projection superimposed on the material of the bottom portion that surrounds the corresponding hole, preventing the extraction of the centering pin from said hole in the direction perpendicular to the bottom plane of the core.
    [0049] Before step c), an optional step of adjusting said at least one retaining device to the size of the bottom portion may be carried out by moving it in a direction parallel to the bottom plane of the core.
    [0051] According to a second aspect, the present invention also concerns a prismatic tray or box forming machine, the machine comprising:
    [0052] • a mold provided with a mouthpiece and wall benders integrated into the mold around said mouthpiece,
    [0053] • a core provided with a bottom plane facing said mouth of the mold and linearly movable through said mouth of the mold by means of a male actuator device;
    [0054] • a blanking plate supplying device configured to position a flat blanking plate between the mold and the core, with a bottom portion of said blank being located between the mouth of the mold and the core;
    [0055] • a glue line applicator device configured to deposit glue lines on predefined areas of said flat die-cut plate.
    [0056] The mold and the core of the proposed machine have already been described in detail above. The tap actuator device is typically a crank-rod mechanism, a piston, linear motor, or other similar mechanism that allows linear reciprocating movement of the tap. The male will be guided, usually in a vertical direction, its displacement being up and down.
    [0057] The die-cut plate supply device usually consists of a die-cut plate magazine and a conveyor which extracts the punched plates, one at a time, from the die-cut plate magazine, and deposits them in the said position between the core and the mold.
    [0058] Said conveyor is usually a conveyor belt, but it can be for example a robot arm.
    [0059] The glue line applicator device may be coordinated with the conveyor device to apply the glue lines in the predefined areas during the transport of said blanks by the conveyor. For example, the blanks can be moved in front of the glue line applicator device and it will supply glue when the predefined areas pass in front of the glue line applicator device, forming the aforementioned glue lines.
    [0060] Typically the glue lines are applied on the flaps or on the wall portions intended to be overlapped by flaps.
    [0061] Glue lines can be cold glue, hot glue, or a combination of cold glue and hot glue lines.
    [0062] It is further proposed that, in a way not known in the existing state of the art:
    [0063] • the core includes a retainer integrated into the bottom plane of the core, the retainer device configured to trap the bottom portion of a flat blank against the core.
    [0065] As previously mentioned, different embodiments of the retaining device are proposed.
    [0066] According to one embodiment, said retaining device comprises one or more cavities integrated in the male and provided with an opening coplanar with the bottom plane of the male, said one or more cavities being in communication with a low-pressure air supply device to produce retention by Suction of the die-cut plate against the male.
    [0067] According to another embodiment, the retaining device comprises one or more centering lugs integrated and protruding from the bottom plane of the core in a direction perpendicular to said bottom plane, each of said one or more centering lugs including an expansive device configured to produce an increase in the size of at least part of said centering pin.
    [0068] The centering lugs are configured to be inserted through complementary holes provided in the bottom portion of the blank. The expansion of the centering pin as a result of the activation of the expansion device will prevent the extraction of the centering pin from the corresponding hole, retaining the blank against the core.
    [0069] The expander device can comprise, for example, at least one tilting retainer articulated around an axis parallel to the bottom plane of the plug and movable, actuated by an expander actuating device, between a retracted position in which the tilting retainer is retracted. in alignment with the rest of the centering pin and an expanded position in which the rocker retainer is laterally protruding of the rest of the centering pin defining an increase in the size of a distal portion of the centering pin.
    [0070] Therefore, according to this embodiment, the pivoting retainer can, by its rotation, protrude laterally from the centering pin or retract within the envelope defined by said centering pin, thus causing an increase or a reduction in the size of the centering pin. To achieve this, said rotation of the tilting retainer is carried out around an axis parallel to the bottom plane of the tap.
    [0071] According to another embodiment of the retaining device, it comprises several integrated and protruding centering lugs from the bottom plane of the core in a direction perpendicular to said bottom plane, said centering lugs being movable with respect to one another causing them to approach or move away, to produce the retention of a bottom portion of the blank provided with holes threaded in said centering lugs. Optionally each of said centering lugs will include a lateral shoulder on a distal portion.
    [0072] The displacement of the centering lugs causing their approach or distance allows said centering lugs to act together as fingers that compress or pull the die-cut sheet causing its retention. The inclusion of said lateral projection will improve said retention by introducing a step in the body of the centering pin that interferes with the blank, making it even more difficult to extract the centering pins from the holes in the blank.
    [0073] Alternatively, it is contemplated that the expansive device of said one or more centering studs includes at least one rotary retainer located in a distal portion of the corresponding centering stud and articulated, by a non-central zone, around an axis perpendicular to the bottom plane of the male located in a non-central area of the corresponding centering pin, the rotation of said rotary retainer being actuated by an expander actuating device.
    [0074] As the axis of rotation of the rotary retainer is off-center with respect to both the centering pin and the rotary retainer, turning the rotary retainer will allow it to be positioned in a position contained in the envelope of the centering pin, aligned with it, or in a laterally protruding position .
    [0075] Another additional embodiment proposes that the expansion device includes an inflatable elastic body connected to a source of compressed air to cause its expansion.
    [0076] Alternatively, the expander device may include a compressible solid elastic body disposed between two end stops, one or both end stops being connected to an expander actuator device configured to produce mutual approach of the end stops in a direction perpendicular to the bottom plane of the plug. causing a compression of the elastic body and its radial expansion.
    [0077] Geometric positional references, such as parallel, perpendicular, tangent, etc. they admit deviations of up to ± 5 ° with respect to the theoretical position defined by said nomenclature.
    [0078] Other characteristics of the invention will appear in the following detailed description of an embodiment.
    [0079] Brief description of the figures
    [0080] The foregoing and other advantages and characteristics will be more fully understood from the following detailed description of an embodiment with reference to the attached drawings, which should be taken by way of illustration and not limitation, in which:
    [0081] Fig. 1 shows a schematic sectional view of the polygonal tray or box forming machine, being in an initial stage of the method;
    [0082] Fig.2 shows the same machine as Fig. 1 but in a final stage of the method;
    [0083] Fig. 3 shows an exploded perspective view from below of the core and the blank, the bottom portion of the blank facing the bottom plane of the core, according to an embodiment in which the core consists of four side walls, that define a frame corresponding to the bottom plane of the core, and a cover that delimits an internal cavity of the core provided with an opening coplanar with the bottom plane of the core and therefore being sealable by the bottom portion of the blank, being said cavity connected by conduits to a suction device, forming a retaining device by suction;
    [0084] Fig. 4 shows a view equivalent to that shown in Fig. 3 but corresponding to another embodiment of the retaining device, according to which the male integrates four suction cups each one formed by a cavity of flexible material with an opening coplanar with the plane of bottom of the core, each cavity being connected by conduits to the suction device;
    [0085] Fig. 5 shows a view equivalent to that shown in Fig. 3 but corresponding to another embodiment of the retaining device, according to which the male integrates two centering lugs protruding from the bottom plane of the male, complementary with two holes provided in the bottom portion of the blank, each centering pin including an expander device at its distal portion;
    [0086] Figs. 6, 7 and 8 each show two detailed views, in a retracted and expanded position, of the same retaining device formed by a centering pin provided with an expander device in its distal portion according to a first, a second and a third embodiment provided with two symmetrical tilting retainers articulated around respective axes parallel to the bottom plane of the male, the three embodiments differing in the expander actuator device;
    [0087] Fig. 9 shows two detailed views, in a retracted and expanded position, of the same retaining device formed by a centering pin provided with an expander device in its distal portion according to a fourth embodiment according to which the expander device consists of two tilting retainers symmetrical articulated around respective axes perpendicular to the bottom plane of the male;
    [0088] Fig. 10 shows two detailed views, in a retracted and expanded position, of the same retaining device formed by a centering pin provided with an expander device in its distal portion according to a fifth embodiment according to which the expander device consists of an elastic body inflatable connected to a source of compressed air to produce its expansion;
    [0089] Fig. 11 shows two detailed views, in the retracted and expanded position, of the same retaining device formed by a centering pin provided with an expander device in its distal portion according to a sixth embodiment according to which the expander device consists of an elastic body compressible solid retained between two end stops, an end stop being connected to an expander actuator device configured to cause mutual approach of the end stops in a direction perpendicular to the bottom plane crushing the compressible solid elastic body causing its radial expansion;
    [0090] Fig. 12 shows two detailed views, in a retracted and expanded position, of the same retaining device formed by two centering lugs movable with respect to each other to bring them closer or farther away.
    [0092] Detailed description of a realization example
    [0093] The attached figures show exemplary non-limiting illustrative embodiments of the present invention.
    [0094] In the embodiment of the tray and box forming machine shown in Figs. 1 and 2, said machine consists of a die-cut plate warehouse 52 where a plurality of identical die-cut plates 10 are stored stacked, from a die-cut plate supply device 50 10, a glue line applicator device 51, a mold 20 and a core 30.
    [0096] The blanks 10 are plates that include a series of cuts and crease lines that determine crease lines of the blanks to allow the formation of a prismatic tray or box by folding the blanks 10 along the crease lines. Said creasing lines divide the blank 10 into different portions corresponding to a rectangular bottom portion 11, intended to constitute the bottom of the tray or prismatic box produced, and to several wall portions 12 located around the bottom portion 11, and which may also include flaps for adhering some wall portions 12 with other wall portions 12, consolidating the tray or box once formed.
    [0098] In this embodiment, the supply device 50 consists of a conveyor belt provided with stops of a thickness equal to or less than the thickness of a die-cut plate 10, leaving a section of said conveyor belt facing the die-cut plate store 52, so that the aforementioned The stops drag the blanks 10 out of the blank magazine 52 one at a time.
    [0100] Another section of the conveyor belt faces the glue line applicator device 51, which consists of nozzles facing said conveyor belt. The coordinated actuation of the nozzles and of the conveyor belt allows precise amounts of glue to be deposited in pre-established areas on one face of a blank 10 carried on said conveyor belt.
    [0102] At the end of the conveyor belt the mold 20 is located, said conveyor belt depositing the blanks 10 on top of said mold 20.
    [0104] The mold 20 consists of a cavity located below a rectangular mouth 21 having the size and shape of the bottom of the tray or box to be produced. Said mouth 21 is surrounded by wall benders 22, one or more on each side of mouth 21.
    [0105] The die-cut plate 10 deposited on the mold 20 is located with the corresponding bottom portion 11 of the die-cut plate 10 facing and superimposed on the mouth. 21 of the mold 20, the wall portions 12 being arranged around the mouth 21, totally or partially facing parts of the wall benders 22 of the mold 20.
    [0107] Above the mouth 21 of the mold 20, and the bottom portion 11 of the blank 10 deposited on the mold 20, the core 30 is located.
    [0109] The male 30 is vertically movable in a guided manner by actuation of a male actuator device to produce the insertion and extraction of the male 30 into the mold 20 through the mouth 21.
    [0111] The male 30 includes a bottom plane 31, facing the mouth 21 of the mold 20, which is perpendicular to the direction of travel of the male 30. In this example said bottom plane 31 is horizontal and parallel to the bottom portion 11 of the blank 10 deposited by the dispensing device 50 above the mouth 21 of the mold 20.
    [0112] Said bottom plane 31 of the core 30 is a pressure surface intended to rest on the bottom portion 11 of the blank 10 and push it towards the interior of the mold 20 causing the interaction of the wall portions 12 of the blank 10 with the wall benders 22 of the mold 20, causing said wall portions 12 to bend with respect to the bottom portion 11 of the blank 10, generating a prismatic tray or box.
    [0114] Each wall bender 22 consists of a curved slip surface that determines a transition between a plane parallel to the bottom plane 31 of the core 30 to a plane perpendicular to said bottom plane 31 of the core 30. The wall portions 12 of the plate The die-cut 10 initially comes into contact with the part of the wall benders 22 parallel to the bottom plane 31, which in this example is horizontal, and as the insertion of the core 30 into the mold 20 occurs, the wall portions 12 slide on said curved slip surface until it is in a vertical position.
    [0115] Typically the glue line applicator device 51 deposits glue lines on flaps included in the wall portions 12 of the blank 10, or on parts of the wall portions 12 intended to be adhered to said flaps.
    [0117] During the bending of the blank 10 within the mold 20 the wall portions 12 with glue lines on top are pressed against other wall portions 12 of the blank 10 by the combined action of the core 30, the mold 20 and the benders of wall 22, allowing the glue lines to adhere the overlapping parts of the die-cut sheet 10, giving strength and stability to the tray or box formed.
    [0119] In the present invention, the blank 10 is asymmetric. In the examples of the blank 10 shown in Figs. 3, 4 and 5 said die-cut plate 10 has a bottom portion 11 surrounded by wall portions 12 only on three of its sides, leaving one side of the bottom portion 11 free of wall portions 12, determining the formation of a tray or box with one side open. In the two corners existing between the three wall portions 12 are included two flaps intended to join together the three existing wall portions 12 when forming the tray or prismatic box.
    [0121] Obviously other embodiments are contemplated in which the four sides of the bottom portion 11 include wall portions 12, but said wall portions 12 being asymmetrical, for example, two wall portions 12 being from opposite sides of the blank 10 of different height, shape or surface.
    [0123] The aforementioned asymmetry causes that, when the die-cut plate 10 is bent by the combined action of the male 30 and the mold 20, asymmetric forces are produced, since the force necessary to bend each of the wall portions 12 with respect to the portion Background 11 will be different on the asymmetric sides, favoring that the die-cut plate 10 can turn over during the tray or box formation process, which can cause imperfections in the formed trays or boxes or even block the machine during the formation process. .
    [0125] To prevent this problem, the present invention proposes to include, in the bottom plane 31 of the core 30, a retaining device 40 that interacts with the bottom portion 11 of the blank 10 during the process of forming the tray or box, retaining and trapping said bottom portion 11 against the bottom plane 31 of the core, preventing any relative movement between them, thus ensuring that there are no undesired displacements of the blank 10 during the process of forming the tray or prismatic box.
    [0127] According to a first and a second embodiment shown in Figs. 3 and 4, said retaining device 40 acts by suction, sucking the bottom portion 11 of the blank 10 against the bottom plane 31 of the core through cavities 41 provided in said background plane 31.
    [0128] In Fig. 3 the entire male acts as a cavity 41 surrounded by four side walls that form a frame that defines the bottom plane 31 of the male 30, said frame surrounding an opening of the cavity 41, coplanar with the bottom plane 31 , which when resting on the bottom portion 31 closes the cavity 41 allowing a low pressure to be applied inside it through pipes connected to a suction device or a vacuum pump, causing the retention and trapping of the bottom portion 11 of the plate die 10 against the bottom plane 31 of the core 30.
    [0130] In the embodiment of Fig. 4, the suction is produced by four suction cups that act as cavities 41 whose opening is coplanar with the bottom plane 31 of the core 30.
    [0132] In Fig. 5 an alternative embodiment of the retaining device 40 is shown, according to which said retaining device 40 consists of several centering lugs 42 protruding from the bottom plane 31 of the tap 30 in a direction perpendicular to said bottom plane 31, the Centering lugs 42 provided with an expansive device 43 in their distal portion, that is to say in the portion furthest from the male 30.
    [0134] The expander device 43 can vary between a retracted position and an expanded position in which the size of the centering pin 42 is increased relative to its size in the retracted position.
    [0136] The centering pin 42 is intended to be inserted through a complementary hole 13 provided in the bottom portion 11 of the blank 10 with the expander device 43 in the retracted position. The subsequent expansion of the distal portion of the centering pin 42 by the action of the expander device 43 prevents the extraction of the centering pin 42 from the mentioned hole 13, retaining and trapping the bottom portion 11 of the blank 10 against the bottom plane 31 of the core 30 .
    [0138] Different embodiments of the expander device 43 are shown in Figs. 6 to 11.
    [0140] In Figs. 6, 7 and 8 the expander device 43 consists of a pair of facing pivoting retainers 45, each one articulated about a horizontal axis E parallel to the bottom plane 31 of the male 30.
    [0142] An expander actuator device 46 is in charge of causing said tilting retainers 45 to rotate causing them to approach to the retracted position or to move away from them to the expanded position.
    [0143] Said expander actuator device 46 may consist of a lever mechanism connected to a piston or linear motor that transmits its movement causing the pivoting retainers 45 to rotate.
    [0145] Alternatively the expander actuator device 46 may be connected to the rocker retainers 45 via a cam and cam follower assembly, as shown in Fig. 7, or via a gear and rack system as shown in Fig. 8, causing rotation of the rocker retainers 45 in response to a linear displacement of a piston or linear motor.
    [0147] An alternative solution is shown in Fig. 9 in which the expansive device 43 consists of two rotating retainers 47 in the shape of a crescent, each articulated by a non-central zone around a vertical axis E perpendicular to the bottom plane 31 of the male 30. The expander actuator device 46 consists in this example of a motor connected to said vertical E axes by means of gears, causing the simultaneous rotation of both rotary retainers 47 between a retracted position in which the two rotary retainers 47 in the form of a half The moon is in contact, together obtaining a full moon shape, and an expanded position in which both rotary retainers 47 are spaced from each other.
    [0149] Figs. 10 and 11 show two alternative embodiments in which the expander device 43 comprises either an inflatable elastic body 48 connected to a source of compressed air to cause its expansion, as shown in Fig. 10, or a body solid compressible elastic 49 disposed between two end stops, one or both end stops being connected to an expander actuator device configured to produce mutual approach of the end stops in a direction perpendicular to the bottom plane of the male, causing compression of the elastic body and its radial expansion, as shown in Fig. 11.
    [0151] Fig. 12 shows another further embodiment according to which the retaining device 40 consists of two centering lugs 42 which, by means of an actuator device, can both move in a direction parallel to the bottom plane 31 of the male 30, bringing them closer or closer together. his estrangement.
    [0153] In any of the previous embodiments, the inclusion of lateral projections 44 in the centering lugs 42 favors the retention of the bottom portion 11 by said centering lugs 42.
    [0154] It will be understood that the different parts that make up the invention described in one embodiment can be freely combined with the parts described in other different embodiments even though said combination has not been explicitly described, provided that there is no harm in the combination.
    权利要求:
    Claims (15)
    [1]
    1. Method for the formation of trays or prismatic boxes by folding and joining a blank (10) provided with a bottom portion (11) and side wall portions (12) by means of a forming machine equipped with a mold (20 ) with a mouth (21) facing a male (30) linearly movable through said mouth (21) of the mold (20), the method comprising:
    a) depositing glue lines on predefined areas of a flat die-cut plate (10);
    b) positioning the bottom portion (11) of the die-cut plate (10) flat between the mouth (21) of the mold (20) and the male (30);
    c) moving the core (30) by contacting a bottom plane (31) of the core (30) with the bottom portion (11) of the blank (10);
    d) inserting the male (30) through the mouth (21) of the mold (20) dragging the bottom portion (11) of the blank (10) inside the mold (20) causing the wall portions to fold side (12) of the die-cut plate (10) in interaction with wall benders (22) integrated in the mold (20) around the mouth (21), bringing the areas with glue lines into contact with other areas of the plate die-cut (10), forming a prismatic tray or box; characterized because
    • the die-cut plate (10) is an asymmetric die-cut plate;
    • between stages c) and d) a retention stage is included that comprises actuating at least one retention device (40) integrated in the bottom plane (31) of the male (30) causing the bottom portion (11) to be trapped of the blank (10) against the male (30); and because
    • the retaining device (40) maintains the retention of the bottom portion (11) during step d).
    [2]
    Method according to claim 1, wherein during step c) one or more cavities (41) integrated in the bottom plane (31) of the core (30) and provided with an opening coplanar with said bottom plane (31) of the core (30) are in close contact with and sealed by the bottom portion (11) the die-cut plate (10), and wherein the retention step comprises applying low pressure air inside said one or more cavities (41) causing the trapping the bottom portion (11) against the male (30) by suction.
    [3]
    3. Method according to claim 1 or 2 wherein during step c) one or more centering lugs (42), constituting said retaining device (40), integrated and protruding from the bottom plane (31) of the male (30) traverse some Complementary holes (13) provided in the bottom portion (11) of the blank (10), and where the retention step comprises actuating an expansive device (43) integrated in said one or more centering lugs (42).
    [4]
    Method according to claim 3, wherein said expansive device (43) increases the size of at least the distal portion of said one or more centering lugs (42) to a size greater than that of the holes (13) provided in the bottom portion. (11) of the die-cut plate (10).
    [5]
    5. Method according to claim 1, 2 or 3 wherein during step c) one or more centering lugs (42), constituting said retaining device (40), integrated and protruding from the bottom plane (31) of the male (30) passing through complementary holes (13) provided in the bottom portion (11) of the blank (10), said centering lugs (42) including a lateral projection (44) in their distal portion; and wherein the retention step comprises moving one or more centering lugs (42) in a direction parallel to the bottom plane (31) of the male (30), moving the one or more centering lugs (42) with respect to the corresponding hole (13) the lateral projection (44) being superimposed on the material of the bottom portion (11) that surrounds the corresponding hole (13), preventing the extraction of the centering pin (42) from said hole (13) in the direction perpendicular to the bottom plane (31) of the male (30).
    [6]
    Method according to any one of the preceding claims, wherein before step c) a step is included for adjusting said at least one retaining device (40) to the size of the bottom portion (11) by moving it in a parallel direction of the bottom plane (31) of the core (30).
    [7]
    7. Prismatic tray or box forming machine, the machine comprising:
    • a mold (20) provided with a mouth (21) and wall benders (22) integrated in the mold (20) around said mouth (21),
    • a male (30) provided with a bottom plane (31) facing said mouth (21) of the mold (20) and linearly movable through said mouth (21) of the mold (20) by means of an actuator device of male;
    • a blanking plate supply device (50) configured to position a flat blank (10) between the mold (20) and the male (30), leaving a bottom portion (11) of said blank (10) located between the mouth (21) of the mold (20) and the core (30);
    • a glue line applicator device (51) configured to deposit glue lines on predefined areas of said flat blank plate (10); characterized because
    • The male (30) includes a retaining device (40) integrated in the bottom plane (31) of the male (30), the retaining device (40) being configured to trap the bottom portion (11) of a blank ( 10) flat against the male (30).
    [8]
    8. Machine according to claim 7 wherein the retaining device (40) comprises one or more cavities (41) integrated in the male (30) and provided with an opening coplanar with the bottom plane (31) of the male (30), being said one or more cavities (41) in communication with a low pressure air supply device.
    [9]
    9. Machine according to claim 7 or 8, wherein the retaining device (40) comprises one or more centering lugs (42) integrated and protruding from the bottom plane (31) of the male (30) in a direction perpendicular to said bottom plane ( 31), each of said one or more centering studs (42) including an expansive device (43) configured to produce an increase in size of at least part of said centering stud (42).
    [10]
    10. Machine according to claim 8, wherein the expansive device (43) includes at least one pivoting retainer (45) articulated around an axis (E) parallel to the bottom plane (31) of the male (30) and movable, actuated by a expander actuator device (46), between a retracted position in which the pivoting retainer (45) is retracted in alignment with the rest of the centering pin (42) and an expanded position in which the pivoting retainer (45) is laterally protruding of the remainder of the centering pin (42) defining an increase in the size of a distal portion of the centering pin (42).
    [11]
    Machine according to claim 7, wherein said at least one retaining device (40) comprises several centering lugs (42) integrated and protruding from the bottom plane (31) of the core (30) in a direction perpendicular to said bottom plane (31 ), said centering lugs (42) being movable with respect to each other, bringing them closer together or moving away, to produce the retention of a bottom portion (11) of the die-cut plate (10) provided with holes (13) threaded in said centering pins (42).
    [12]
    12. Machine according to claim 11, wherein each of said centering lugs (42) includes a lateral projection (44) in a distal portion.
    [13]
    13. Machine according to claim 9, wherein the expansion device (43) of said one or more centering pins (42) includes at least one rotary retainer (47) located in a distal portion of the corresponding centering pin (42) and articulated, by a non-central area, around an axis (E) perpendicular to the bottom plane (31) of the male (30) located in a non-central area of the corresponding centering pin (42), the rotation of said rotary retainer (47) being actuated by an expander driver device (46).
    [14]
    14. Machine according to claim 9 wherein the expansive device (43) includes an inflatable elastic body (48) connected to a source of compressed air to cause its expansion.
    [15]
    15. Machine according to claim 9, wherein the expander device (43) includes a compressible solid elastic body (49) arranged between two end stops, one or both end stops being connected to an expander actuating device configured to produce the mutual approach of the end stops in a direction perpendicular to the bottom plane (31) of the male (30), causing a compression of the elastic body and its radial expansion.
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    同族专利:
    公开号 | 公开日
    ES2782049B2|2021-01-25|
    引用文献:
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    GB908544A|1960-02-23|1962-10-17|Hesser Ag Maschf|Method of and apparatus for the automatic and continuous production of package covers from thermoplastic sheet|
    GB2023548A|1978-05-13|1980-01-03|Nutro Patent & Maschinen|Feeding Sheets in Apparatus for Producing Trays|
    EP0022139A1|1979-07-06|1981-01-14|Kliklok Corporation|Method and apparatus for forming a flanged tray|
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    ES2593823A1|2015-06-08|2016-12-13|Telesforo Gonzalez Maquinaria Slu|Machine for forming bases or caps of prismatic boxes by bending and joining of die-cut plates |
    JP2017047635A|2015-09-03|2017-03-09|東罐興業株式会社|Transport device|
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    优先权:
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    ES201930204A|ES2782049B2|2019-03-06|2019-03-06|METHOD AND MACHINE FOR THE FORMATION OF TRAYS OR PRISMATIC BOXES BY BENDING AND JOINING DIE-CUTTING PLATES|ES201930204A| ES2782049B2|2019-03-06|2019-03-06|METHOD AND MACHINE FOR THE FORMATION OF TRAYS OR PRISMATIC BOXES BY BENDING AND JOINING DIE-CUTTING PLATES|
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