EP3810537B1 - Band unwinding device and machine for stamping sheet-shaped elements - Google Patents

Band unwinding device and machine for stamping sheet-shaped elements Download PDF

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Publication number
EP3810537B1
EP3810537B1 EP19769382.3A EP19769382A EP3810537B1 EP 3810537 B1 EP3810537 B1 EP 3810537B1 EP 19769382 A EP19769382 A EP 19769382A EP 3810537 B1 EP3810537 B1 EP 3810537B1
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EP
European Patent Office
Prior art keywords
satellite
central drum
strip
central
satellite roller
Prior art date
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Active
Application number
EP19769382.3A
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German (de)
French (fr)
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EP3810537A1 (en
Inventor
Christophe De Gaillande
Bernard Jaquet
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Bobst Mex SA
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Bobst Mex SA
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Publication of EP3810537A1 publication Critical patent/EP3810537A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/24—Advancing webs by looping or like devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H16/00—Unwinding, paying-out webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/449—Features of movement or transforming movement of handled material
    • B65H2301/4491—Features of movement or transforming movement of handled material transforming movement from continuous to intermittent or vice versa
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/15—Roller assembly, particular roller arrangement
    • B65H2404/152—Arrangement of roller on a movable frame
    • B65H2404/1521—Arrangement of roller on a movable frame rotating, pivoting or oscillating around an axis, e.g. parallel to the roller axis

Definitions

  • the present invention relates to a strip unwinding device for a sheet-shaped element stamping machine.
  • the invention also relates to a stamping machine configured to deposit on each sheet of the gold or metallized film from at least one strip to be stamped.
  • Each strip to be stamped is packaged in the form of a reel which is rotatably mounted on itself, and which is unwound by means of a feed shaft pulling directly on the strip.
  • this advance shaft is destined to rotate at variable speed since the tape advance takes place sequentially within the platen press.
  • the coil has a mass and therefore a relatively large inertia, it proves to be particularly difficult for it to follow such a succession of accelerations, decelerations and time delays.
  • a tape unwinding system which is capable both of accumulating tape in a pre-unrolled form downstream of the reel, and of delivering the correct length of pre-unrolled tape at each load on the advance shaft.
  • the presence of such a tape reserve in the interposed position then advantageously makes it possible to unwind the reel at a substantially constant speed, while allowing the advance shaft to operate at variable speed.
  • a tape unwinding system which takes place between the reel and the advance shaft, and which implements two series of references whose spacing is likely to vary according to the tape advance.
  • the two series of returns are arranged so as to define a tape circulation path, the shape of which describes a succession of loops which circumvent each return respectively by passing alternately from one series of returns to the other.
  • One of the series of transmissions is mounted so as to move relative to the other, between a position close in which the series of returns are arranged close to each other so as to define a strip circulation path of minimum length, and a remote position in which said series of returns are arranged at a distance from one of the other so as to define a strip circulation path of maximum length.
  • This tape unwinding system can however generate jolts due to the inertia of the reel, in particular during the transient phases of start-up, acceleration stop and deceleration. These jolts can stretch the strip to be stamped and damage it.
  • a reel braking device is also generally necessary to guarantee an optimum web tension and not to unwind the reel more than necessary when the advance shaft slows down and stops.
  • Another disadvantage of this system is that it can prove difficult to implement, in particular following a production malfunction.
  • Another problem also is that the outsourced system requires a space on the ground and a strip deployment between the reel and the press which are not negligible. This long length of unwound strip can affect the accuracy of placement and increase the length of strip consumed.
  • the document WO2010/063353 describes a web unwinding system comprising a central roll and a satellite roll.
  • the axis of the satellite roller is mounted on a rotation system whose axis coincides with the axis of the central roller and allows the satellite roller to move around the central roller.
  • the movement of the satellite roller makes it possible to vary the advance of the strip at the exit of the system.
  • the satellite roller being large enough to allow a sufficiently large variation in the advance of the strip.
  • One of the aims of the present invention is to propose a device for unwinding a strip to be stamped which makes it possible to at least partially solve at least one of the aforementioned drawbacks.
  • the strip to be stamped can thus be pre-unrolled at constant speed from the stamping reel, pulled by the satellite roller.
  • the tape can be fed out of the tape unwinding device at the variable forward speed.
  • the length of accumulated strip to be stamped varies with the angular displacement of the satellite roller around the central drum which itself varies, due to the planetary drive, as a function of the difference in the speeds of rotation of the central drum and of the outer ring. It is thus possible to accumulate strip to be stamped and then to deliver the strip to be stamped accumulated each time the feed shaft is actuated.
  • the tape unwinding device is more compact than a “linear” system of the prior art because it can be integrated directly into the machine. It is also more robust and easier to implement. The distance between the reel and the press can be small, which makes it possible to increase the strip laying precision and therefore to reduce the strip consumed.
  • the pitch radius of the central pinion corresponds to the outer radius of the central drum.
  • the diameter of the satellite roller has a dimension smaller than the radial gap located between the pitch diameter of the outer crown and the outer diameter of the central drum.
  • the satellite roller is rotatable.
  • the planetary drive device further comprises a toothed wheel mounted on the planet carrier, integral in movement with the planet roller and meshing with the outer crown.
  • the pitch radius of the toothed wheel corresponds for example to the outer radius of the satellite roller.
  • the satellite roller is fixed to a planet carrier of the planetary drive device, the satellite roller being porous and having an internal cavity configured to be placed in communication with pressurized air so as to form an air cushion under the strip to be stamped.
  • the planetary drive device comprises a guide integral in movement with the satellite roller around the central drum, the guide being capable of being interposed between two strands of the pre-unrolled strip to guide an outer strand of said strip.
  • the guide comprises between one and ten, such as five, additional satellite roller(s), the additional satellite roller(s) and the roller satellite inscribed in a circle.
  • the additional satellite roller(s) may be rotatable.
  • the guide further comprises for example as many toothed wheels as additional satellite rollers, the toothed wheels being mounted on the planet carrier and integral in rotation with a respective additional satellite roller and meshing with the outer ring.
  • the guide comprises a metal element fixed to the planet carrier, the metal element having between one and ten, such as five fold(s) or undulation(s), the fold(s) or undulation( s) and the satellite roll fitting into a circle.
  • the diameter of said circle corresponds to the pitch diameter of the outer crown.
  • the outer crown is configured to be driven in rotation at a constant speed substantially equal to an average value of the variable advance speed.
  • the axis of the central drum is capable of being driven in rotation at a variable advance speed by a motor of the strip unwinding device to form an advance shaft. This reduces the number of parts.
  • the subject of the invention is also a machine for stamping elements in the form of sheets configured to deposit on each sheet gold or metallized film from at least one strip to be stamped, characterized in that it further comprises at least one device tape unwinding as previously described.
  • upstream and downstream are defined with reference to the longitudinal direction of movement of the sheets D ( Figure 1 ).
  • the sheets move from upstream to downstream, generally following the main longitudinal axis of the machine, in a rhythmic movement with periodic stops.
  • sheet-shaped elements and “sheets” will be considered equivalent, and will concern elements made of corrugated cardboard as well as flat cardboard, paper or any other material commonly used in the packaging industry.
  • sheet or “element in sheets” or “element in the form of sheets” refer very generally to any printing medium in the form of sheets such as, for example , sheets of cardboard, paper, plastic, etc.
  • FIG. 1 represents an embodiment of a stamping machine 1 capable of depositing on each sheet of the gold or metallized film from at least one strip to be stamped 2, in particular for the manufacture of packaging.
  • This machine 1 is conventionally composed of several workstations 100, 200, 300, 400, 500 which are juxtaposed but interdependent one by one to form a unitary assembly able to process a succession of sheet-like elements.
  • a transport device 600 is also provided to individually move each sheet from the exit of the feed table 200 to the receiving station 500, including through the stamping station 300.
  • the sheets are successively removed from the top of a stack by a suction gripper which transports them to the directly adjacent feed table 200 .
  • the sheets are put into a sheet by the suction gripper, that is to say placed one after the other so as to partially overlap.
  • the entire web is then moved along a platen towards the stamping station 300, by means of a belt transport mechanism.
  • the head sheet can be systematically positioned with precision by means of frontal and lateral cleats or by a register system.
  • the workstation located just after the margin table 200 is therefore the stamping station 300.
  • the latter has the function of depositing on each sheet, by hot stamping, the metallized film which comes from a strip to be stamped 2. It uses for this a platen press 310 inside which the stamping operation takes place conventionally, between a heated upper platen 320 which is fixed, and a lower platen 330 which is mounted to move along a vertical back-and-forth motion.
  • the strip supply station 400 is responsible for ensuring both the supply of the machine 1 with stamping strip 2 as well as the evacuation of this same strip 2 once it has been used after having passed through the station. stamping 300.
  • the process of processing the sheets in the stamping machine 1 ends in the receiving station 500, the main function of which is to repackage the previously processed sheets into a stack.
  • the transport device 600 is for example arranged so as to automatically release each sheet when the latter finds itself in line with this new stack. The sheet then falls squarely on top of the pile.
  • the transport device 600 implements a series of gripper bars which are movably mounted via two chain trains 620 arranged laterally on each side of the stamping machine 1.
  • Each chain train 620 traverses a loop which allows the gripper bars to follow a trajectory successively passing through the stamping station 300, the tape supply station 400 and the receiving station 500.
  • the set of gripper bars will start from a stopped position, accelerate, reach a maximum speed, decelerate, then stop, thus describing a cycle corresponding to the movement of a sheet from a work station to the station.
  • Chain trains 620 move and stop periodically so that during each move all of the gripper bars engaged with a sheet are moved from one station to the adjacent downstream work station. Each station performs its work in synchronism with this cycle which is commonly called the machine cycle. Workstations start a new job each time a machine cycle begins.
  • the strip supply station 400 comprises at least one strip unwinding device 10 capable of accumulating the strip to be stamped 2 in a pre-unrolled form downstream of at least one stamping reel 3 and of delivering the pre-rolled tape at each load on a feed shaft of machine 1.
  • the tape unwinding device 10 is interposed between at least one stamping reel 3 and the platen press 310 ( Figure 1 ).
  • the tape unwinding device 10 comprises a central drum 11, a satellite roller 14 and a planetary drive device 15.
  • the central drum 11 is configured to be driven in rotation at a variable forward speed, integral in rotation with an axis 16 of the tape unwinding device 10.
  • the forward speed controlled by the machine 1 increases then decreases (we speak of "advance") and cancels out.
  • This step of advance causes the band to be stamped 2 to coincide with a sheet for depositing the metallized film by stamping according to a predefined program in the machine 1.
  • the advances can be identical or different between each stop or different between at least two successive and periodic stops.
  • the satellite roller 14 has an axis 21 arranged parallel to the axis 16 of the central drum 11.
  • the satellite roller 14 is capable of rotating around the central drum 11.
  • the pre-unrolled strip is likely to wrap around the central drum 11 (over less than one turn) under the effect of the displacement of the satellite roller 14. More specifically, the pre-rolled strip is wrapped around of the central drum 11 after having bypassed the satellite roller 14 forming a return of the pre-unrolled strip ( Figures 10 and 11 ).
  • the planetary drive device 15 comprises a central pinion 12, an outer crown 13, a planet carrier 17 and at least one planet pinion 20 ( Figure 4 And 5 ).
  • the central pinion 12 is integral in rotation with the central drum 11 and it is coaxial with the central drum 11 ( Figure 6 ). They are for example fixed to the axis 16 ( Figure 4 ). A bearing supports for example the opposite end of the axis 16.
  • the pitch radius of the central pinion 12 corresponds for example to the outer radius of the central drum 11 ( Figure 6 ).
  • the outer crown 13 is toothed ( Picture 7 ). It is coaxial with the central pinion 12 and is configured to be driven in rotation at constant speed.
  • the term "constant" means a substantially constant speed, that is to say for example varying over less than +/- 10% of an average speed.
  • the constant speed is for example substantially equal to an average value of the variable forward speed.
  • the direction of rotation of the outer crown 13 is opposite to the direction of rotation of the central drum 11.
  • the direction of rotation of the outer crown 13 is chosen so that the rotation of the outer crown 13 unwinds the stamping reel 3.
  • the outer ring 13 is for example carried by a support 19 rotatably mounted on the axis 16 by means of a bearing ( Figure 4 ). In the axial direction, the central pinion 12 is interposed between the central drum 11 and the support 19 of the outer crown 13.
  • the satellite roller 14 has, for example, a diameter of a dimension smaller than the radial gap located between the pitch diameter of the outer ring 13 and the outer diameter of the central drum 11, which allows an inner strand of the strip to be stamped 2 s 'rolling on the central drum 11 to interpose without getting stuck between the satellite roller 14 and the central drum 11.
  • the planet carrier 17 is integral in movement with the planet roller 14 around the central drum 11 and coaxial with the central drum 11.
  • the planet carrier 17 is for example rotatably mounted on the axis 16 by means of a bearing ( Figure 4 ).
  • the planet carrier 17 is formed on the one hand by a disc 17a, for example solid, having a bearing in the center and on the other hand, by a crown 17b fixed coaxially to the disc 17a and carrying bearings for the axes of at least one satellite pinion 20 and, if necessary, and as will be seen later, toothed wheels 18 and 24 ( Figure 4 , 8 and 9 ).
  • the at least one satellite pinion 20 is mounted on the planet carrier 17. It meshes on the one hand, the outer crown 13 and on the other hand, the central pinion 12 to be driven in rotation in one direction or the other around the central drum 11 as a function of the difference in the speeds of rotation of the central drum 11 and of the outer ring 13.
  • the movement of the at least one satellite pinion 20 causes the movement of the satellite roller 14 around the central drum 11 which varies the length of the pre-rolled strip.
  • the planetary drive device 15 comprises for example four planet pinions 20 mounted on the planet carrier 17, for example inscribed in a cross shape ( Figure 5 , 8 and 9 ).
  • the planet gears 20 transmit the drives of the outer crown 13 and of the central pinion 12 to the planet carrier 17 integral in movement with the planet roller 14.
  • the planet gears 20 are not themselves connected to any planet roller.
  • the diameter of at least one satellite pinion 20 is for example substantially larger than the diameter of the satellite roller 14.
  • the satellite pinions 20, the central pinion 12 and the outer ring 13 are arranged at one end of the shaft 16, substantially in the same plane. They are, for example, received in a box 28 ( Figure 2 And 3 ).
  • This arrangement of gears is also called “planetary train” or “planetary drive”, the “inner planetary” or “sun” being the central pinion 12, the “outer planetary” or “crown” being the outer crown 13 and the “satellite meshing the two sun gears and rotating around their common axis being the planet pinion 20, the "common axis" being the axis 16.
  • the satellite roller 14 is rotatable, and can turn on itself around its axis 21.
  • the strip to be stamped 2 can thus be rolled up without friction around the satellite roller 14.
  • the planetary drive device 15 further comprises a toothed wheel 18 mounted on the planet carrier 17, integral in movement with the planet roller 14 and meshing with the outer crown 13.
  • the toothed wheel 18 and the planet roller 14 are for example mounted on the axis 21 at one end of the satellite roller 14 ( Figure 4 ).
  • a bearing supports for example the opposite end of the axis 21 of the satellite roller 14.
  • the pitch radius of the toothed wheel 18 corresponds for example to the outer radius of the satellite roller 14.
  • the circumferential speed of rotation of the satellite roller 14 then corresponds to the speed of rotation of the outer crown 13 at which the strip to be stamped 2 is unwound from the stamping reel 3.
  • the strip to be stamped 2 can thus be driven by the satellite roller 14 at the same speed as it is unwound from the stamping coil 3.
  • the satellite roller 14 is non-rotating. It is for example fixed to the planet carrier 17.
  • the planet roller 14 can be porous and have an internal cavity configured to be placed in communication with pressurized air so as to form an air cushion under the stamping strip 2 so that the stamping strip 2 can be rolled up without friction around the satellite roller 14.
  • the planetary drive device 15 further comprises a guide 22 integral in movement with the satellite roller 14 around the central drum 11 ( Figures 8 and 9 ).
  • the guide 22 is capable of being interposed between two strands of the pre-unrolled strip 2, an inner strand of the strip to be stamped 2 being against the central drum 11 and an outer strand, to guide an outer strand of the strip ( Figure 10 and 11 ).
  • the guide 22 comprises between one and ten, such as five, additional satellite roller(s) 23, the additional satellite roller(s) 23 and the satellite roller 14 being part of a circle C ( Figure 9 ).
  • the additional satellite rollers 23 and the satellite roller 14 are for example regularly spaced, for example on an arc of a circle between 90° and 180°.
  • the guide 22 may further comprise a holding element 34 to hold and guide the opposite ends of the additional satellite rollers 23 around the axis 16.
  • the additional satellite roller(s) 23 can be rotatable.
  • the outer strand of the pre-unrolled strip can thus slide on the additional rotary satellite rollers 23 almost without friction.
  • the guide 22 comprises between one and ten, such as five, additional rotary planet rollers 23 and as many toothed wheels 24 mounted on the planet carrier 17 ( Figure 5 And 8 ).
  • the toothed wheels 24 are integral in rotation with an additional satellite roller 23 respectively. They are mounted at one axial end of a respective additional satellite roller 23 and mesh with the outer crown 13.
  • a bearing can support the opposite end of each additional satellite roller 23.
  • the additional satellite rollers 23 and the toothed wheels 24 have, for example, diameters of dimensions similar to the satellite roller 14.
  • the inner strand of the strip to be stamped 2 can thus be interposed without getting stuck between, on the one hand, the satellite roller 14 and the additional satellite rollers 23 and on the other hand, the central drum 11.
  • the diameter of said circle C corresponds for example substantially to the pitch diameter of the outer crown 13.
  • the circumferential rotational speed of the additional satellite rollers 23 corresponds to the rotational speed of the outer crown 13 at which the strip to be stamped 2 is unwound from the stamping reel 3. The strip to be stamped 2 can thus be driven by the additional satellite rollers 23 at the same speed as it is unwound from the stamping reel 3.
  • the strip 2 to be stamped coming from the stamping reel 3 can thus be guided by the additional satellite rollers 23 so that the outer strand approximately follows the pitch diameter of the outer crown 13, the outer strand being substantially parallel to the inner strand of the strip winding around the central drum 11.
  • the guide 22 may further comprise a plate 32, or plate elements, fixed to the satellite carrier 17 in an arc of a circle to guide the inner strand of the strip to be stamped 2 against the central drum 11 ( Figures 8 to 11 ).
  • the strip to be stamped 2 is for example oriented tangentially to the additional satellite rollers 23 by an entry return 26.
  • the strip to be stamped 2 can be returned to the horizontal by an exit return 27 to guide the strip 2 flat in the platen press 310 ( Figure 1 ).
  • the tape unwinding device 10 to comprise a motor 25 configured to drive the axis 16 of the central drum 11 at a variable forward speed ( Figures 3 and 4 ).
  • the motor 25 is for example in direct connection with the end of the axis 16.
  • the axis 16 integral in rotation with the central drum 11 to unwind the strip to be stamped 2 thus also forms the advance shaft. This reduces the number of parts.
  • the strip unwinding device 10 may further comprise a feed roller 29 pressing the central drum 11 to guarantee good transmission between the strip to be stamped 2 and the central drum 11 ( Figure 1 ).
  • the outer ring 13 can be rotated at constant speed by an additional motor 31 of the tape unwinding device 10 ( Figure 3 ).
  • the additional motor 31 drives the outer crown 13 for example via a pulley system.
  • the outer crown 13 is driven in rotation at constant speed, for example at a speed of rotation substantially equal to an average value of the variable advance speed (in the counterclockwise direction on the example of the Figures 10 and 11 ).
  • the satellite roller 14 When the feed rate is zero ( Picture 10 ), the satellite roller 14 is driven (here in the direction of counterclockwise rotation) around the central drum 11 by the outer ring 13. The movement of the satellite roller 14 has the effect of increasing the length of pre-unrolled strip and thus the accumulated tape reserve. There Picture 10 thus illustrates a first extreme position of the satellite roller 14 for which the reserve of pre-unrolled strip is maximum. While the satellite roller 14 is moving around the central drum 11 to reach this first extreme position, a deposit of gold or metallic film is carried out on a sheet in the platen press 310.
  • the central drum 11 is rotated in the opposite direction to the outer ring 13 (clockwise on the Picture 11 ) causing the rotation of the satellite roller 14 in the same direction, which reduces the length of pre-unrolled strip which is delivered to the stamping station 400.
  • the Picture 11 shows an example of a second extreme position of the satellite roller 14 for which the reserve of pre-unrolled tape is minimal.
  • the strip 2 to be stamped can thus be pre-unrolled at constant speed from the stamping reel 3, pulled by the satellite roller 14.
  • the strip can be delivered at the exit from the strip unwinding device 10 at the variable feed given by the central drum 11.
  • the accumulated length of strip 2 to be stamped varies with the angular displacement of the satellite roller 14 around the central drum 11 which varies, due to the planetary drive, as a function of the difference in rotational speeds of the central drum 11 and of the outer crown 13. It is thus possible to accumulate strip 2 to be stamped and then to deliver the strip 2 to be stamped accumulated at each request of the advance shaft.
  • coils 3 can also be unwound with the tape unwinding device 10 if these are delivered to the stamping station 300 with the same feed speed.
  • the tape unwinding device 10 is more compact than a “linear” system of the prior art because it can be integrated directly into the machine 1. It is also more robust and easier to implement.
  • the distance between the reel 3 and the press 310 can be small, which makes it possible to increase the strip laying precision and therefore to reduce the strip consumed.
  • the unwinding of the stamping reel 3 can continue to be braked in production by a braking device to guarantee a minimum strip tension but in a much smoother way, which makes it possible to avoid jerks which can deteriorate the strip .
  • the guide 33 comprises a metal element, such as a metal sheet, such as a metal sheet, having between one and ten, such as five, folds or undulations 30.
  • the guide 33 may further comprise a holding element 34 to hold and guide the opposite end of the metallic element around the axis 16.
  • the folds or undulations 30 and the satellite roller 14 are part of a circle, coaxial with the outer ring 13.
  • the diameter of said circle corresponds for example substantially to the pitch diameter of the outer ring 13.
  • the folds or undulations 30 are for example regularly spaced, for example on an arc of a circle between 90° and 180°.
  • the outer strand of the pre-rolled strip can thus slide over the folds or undulations 30 almost without friction.
  • the strip 2 to be stamped coming from the stamping reel 3 can thus be guided by the folds or undulations 30 so that the outer strand approximately follows the pitch diameter of the outer crown 13.
  • the outer strand is then substantially parallel to the inner strand of the strip which wraps around the central drum 11. The more folds or undulations 30 there are, the more the guiding of the outer strand is circular, which makes it possible to avoid jerky unwinding of the strip.

Landscapes

  • Advancing Webs (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Physical Vapour Deposition (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Description

La présente invention concerne un dispositif de déroulage de bande pour une machine d'estampage d'éléments en forme de feuilles. L'invention concerne également une machine d'estampage configurée pour déposer sur chaque feuille de la pellicule dorée ou métallisée issue d'au moins une bande à estamper.The present invention relates to a strip unwinding device for a sheet-shaped element stamping machine. The invention also relates to a stamping machine configured to deposit on each sheet of the gold or metallized film from at least one strip to be stamped.

Il est connu d'imprimer des textes et/ou des motifs par estampage, c'est-à-dire de déposer par pression sur un support en forme de feuille de la pellicule colorée ou métallisée issue d'une ou plusieurs bandes à estamper communément appelées bandes métallisées. Dans l'industrie, une telle opération de transfert est traditionnellement réalisée au moyen d'une presse à platines dans laquelle les supports d'impression sont introduits feuille à feuille, tandis que chaque bande à estamper est amenée de façon continue.It is known to print texts and / or patterns by stamping, that is to say to deposit by pressure on a sheet-shaped support of the colored or metallized film from one or more strips to be stamped commonly called metallic bands. In industry, such a transfer operation is traditionally carried out by means of a platen press in which the printing supports are introduced sheet by sheet, while each band to be stamped is fed continuously.

Chaque bande à estamper est conditionnée sous la forme d'une bobine qui est montée mobile en rotation sur elle-même, et qui est dévidée par l'intermédiaire d'un arbre d'avance tirant directement sur la bande. En pratique, cet arbre d'avance est voué à tourner à vitesse variable étant donné que l'avance de bande s'opère de façon séquentielle au sein de la presse à platines. Mais comme la bobine présente une masse et donc une inertie relativement importante, il s'avère particulièrement difficile pour elle de suivre une telle succession d'accélérations, de décélérations et de temporisations.Each strip to be stamped is packaged in the form of a reel which is rotatably mounted on itself, and which is unwound by means of a feed shaft pulling directly on the strip. In practice, this advance shaft is destined to rotate at variable speed since the tape advance takes place sequentially within the platen press. But since the coil has a mass and therefore a relatively large inertia, it proves to be particularly difficult for it to follow such a succession of accelerations, decelerations and time delays.

Pour remédier à cette difficulté, on a pensé à dissocier la rotation de la bobine de celle de l'arbre d'avance, en constituant une réserve de bande entre ces deux organes rotatifs. Pour cela, on utilise habituellement un système de déroulage de bande qui est capable à la fois, d'accumuler de la bande sous une forme pré-déroulée en aval de la bobine, et de délivrer une juste longueur de bande pré-déroulée à chaque sollicitation de l'arbre d'avance. La présence d'une telle réserve de bande en position intercalée permet alors avantageusement de dévider la bobine à vitesse sensiblement constante, tout en laissant fonctionner l'arbre d'avance à vitesse variable.To remedy this difficulty, it was thought to dissociate the rotation of the reel from that of the advance shaft, by constituting a tape reserve between these two rotary members. For this, a tape unwinding system is usually used which is capable both of accumulating tape in a pre-unrolled form downstream of the reel, and of delivering the correct length of pre-unrolled tape at each load on the advance shaft. The presence of such a tape reserve in the interposed position then advantageously makes it possible to unwind the reel at a substantially constant speed, while allowing the advance shaft to operate at variable speed.

A cet égard, on connaît du document WO2012/116781 , un système de déroulage de bande qui prend place entre la bobine et l'arbre d'avance, et qui met en oeuvre deux séries de renvois dont l'écartement est susceptible de varier en fonction de l'avance de bande. Concrètement, les deux séries de renvois sont disposées de manière à définir un chemin de circulation de bande dont la forme décrit une succession de boucles qui contournent respectivement chaque renvoi en passant alternativement d'une série de renvois à l'autre. Une des séries de renvois est montée mobile en déplacement par rapport à l'autre, entre une position rapprochée dans laquelle les séries de renvois sont disposées à proximité l'une de l'autre de façon à définir un chemin de circulation de bande de longueur minimale, et une position éloignée dans laquelle lesdites séries de renvois sont disposées à distance l'une de l'autre de manière à définir un chemin de circulation de bande de longueur maximale.In this respect, we know from the document WO2012/116781 , a tape unwinding system which takes place between the reel and the advance shaft, and which implements two series of references whose spacing is likely to vary according to the tape advance. In concrete terms, the two series of returns are arranged so as to define a tape circulation path, the shape of which describes a succession of loops which circumvent each return respectively by passing alternately from one series of returns to the other. One of the series of transmissions is mounted so as to move relative to the other, between a position close in which the series of returns are arranged close to each other so as to define a strip circulation path of minimum length, and a remote position in which said series of returns are arranged at a distance from one of the other so as to define a strip circulation path of maximum length.

Ce système de déroulage de bande peut toutefois générer des à-coups du fait de l'inertie de la bobine, notamment lors des phases transitoires de démarrage, d'arrêt d'accélération et de décélération. Ces à-coups peuvent étirer la bande à estamper et l'endommager. Un dispositif de freinage de la bobine est de plus généralement nécessaire pour garantir une tension de bande optimale et ne pas dérouler la bobine plus que nécessaire lorsque l'arbre d'avance ralenti et s'arrête. Un autre inconvénient de ce système est qu'il peut s'avérer délicat à mettre en oeuvre notamment suite à un dysfonctionnement de production. Un autre problème également est que le système externalisé requiert une place au sol et un déploiement de bande entre la bobine et la presse qui sont non négligeables. Cette longueur importante de bande déroulée peut nuire à la précision de dépose et augmenter la longueur de bande consommée.This tape unwinding system can however generate jolts due to the inertia of the reel, in particular during the transient phases of start-up, acceleration stop and deceleration. These jolts can stretch the strip to be stamped and damage it. A reel braking device is also generally necessary to guarantee an optimum web tension and not to unwind the reel more than necessary when the advance shaft slows down and stops. Another disadvantage of this system is that it can prove difficult to implement, in particular following a production malfunction. Another problem also is that the outsourced system requires a space on the ground and a strip deployment between the reel and the press which are not negligible. This long length of unwound strip can affect the accuracy of placement and increase the length of strip consumed.

Le document WO2010/063353 décrit un système de déroulement de bande comprenant un rouleau central et un rouleau satellite. L'axe du rouleau satellite est monté sur un système de rotation dont l'axe coïncide avec l'axe du rouleau central et permet au rouleau satellite de se déplacer autour du rouleau central. Le mouvement du rouleau satellite permet de faire varier l'avance de la bande à la sortie du système. Le rouleau satellite étant assez grand pour permettre une variation suffisamment importante de l'avance de la bande.The document WO2010/063353 describes a web unwinding system comprising a central roll and a satellite roll. The axis of the satellite roller is mounted on a rotation system whose axis coincides with the axis of the central roller and allows the satellite roller to move around the central roller. The movement of the satellite roller makes it possible to vary the advance of the strip at the exit of the system. The satellite roller being large enough to allow a sufficiently large variation in the advance of the strip.

Un des buts de la présente invention est de proposer un dispositif de déroulage de bande à estamper permettant de résoudre au moins partiellement au moins un des inconvénients précités.One of the aims of the present invention is to propose a device for unwinding a strip to be stamped which makes it possible to at least partially solve at least one of the aforementioned drawbacks.

A cet effet, la présente invention a pour objet un dispositif de déroulage de bande pour machine d'estampage susceptible d'accumuler de la bande à estamper sous une forme pré-déroulée entre au moins une bobine d'estampage et une presse à platines de la machine d'estampage, le dispositif de déroulage de bande comportant :

  • un tambour central configuré pour être entrainé en rotation à une vitesse d'avance variable,
  • un rouleau satellite présentant un axe agencé parallèlement à l'axe du tambour central, le rouleau satellite étant susceptible de tourner autour du tambour central, la bande pré-déroulée étant susceptible de s'enrouler autour du tambour central sous l'effet du déplacement du rouleau satellite,
    le dispositif étant caractérisé en ce que :
    • le tambour central est solidaire en rotation d'un axe du dispositif de déroulage de bande, et en ce que le dispositif de déroulage de bande comporte en outre
    • un dispositif d'entrainement planétaire pour déplacer le rouleau satellite autour du tambour central en fonction de la différence des vitesses de rotation du tambour central et d'une couronne extérieure du dispositif d'entrainement planétaire configurée pour être entrainée en rotation à vitesse constante dans un sens de rotation contraire au sens de rotation du tambour central.
To this end, the subject of the present invention is a strip unwinding device for a stamping machine capable of accumulating the strip to be stamped in a pre-unrolled form between at least one stamping reel and a press with the stamping machine, the tape unwinding device comprising:
  • a central drum configured to be rotated at a variable forward speed,
  • a satellite roller having an axis arranged parallel to the axis of the central drum, the satellite roller being capable of rotating around the central drum, the pre-unrolled strip being capable of being wound around the central drum under the effect of the movement of the satellite roller,
    the device being characterized in that:
    • the central drum is integral in rotation with an axis of the tape unwinding device, and in that the tape unwinding device further comprises
    • a planetary drive device for moving the satellite roller around the central drum according to the difference in the rotational speeds of the central drum and an outer ring of the planetary drive device configured to be rotated at a constant speed in a direction of rotation opposite to the direction of rotation of the central drum.

La bande à estamper peut ainsi être pré-déroulée à vitesse constante de la bobine d'estampage, tirée par le rouleau satellite. La bande peut être délivrée en sortie du dispositif de déroulage de bande à la vitesse d'avance variable. La longueur de bande à estamper accumulée varie avec le déplacement angulaire du rouleau satellite autour du tambour central qui lui varie, du fait de l'entrainement planétaire, en fonction de la différence des vitesses de rotation du tambour central et de la couronne extérieure. Il est ainsi possible d'accumuler de la bande à estamper puis de délivrer la bande à estamper accumulée à chaque sollicitation de l'arbre d'avance.The strip to be stamped can thus be pre-unrolled at constant speed from the stamping reel, pulled by the satellite roller. The tape can be fed out of the tape unwinding device at the variable forward speed. The length of accumulated strip to be stamped varies with the angular displacement of the satellite roller around the central drum which itself varies, due to the planetary drive, as a function of the difference in the speeds of rotation of the central drum and of the outer ring. It is thus possible to accumulate strip to be stamped and then to deliver the strip to be stamped accumulated each time the feed shaft is actuated.

Le dispositif de déroulage de bande est plus compact qu'un système « linéaire » de l'art antérieur car il peut être intégré directement dans la machine. Il est en outre plus robuste et plus facile à mettre en oeuvre. La distance entre la bobine et la presse peut être faible, ce qui permet d'augmenter la précision de dépose de bande et donc de réduire la bande consommée.The tape unwinding device is more compact than a “linear” system of the prior art because it can be integrated directly into the machine. It is also more robust and easier to implement. The distance between the reel and the press can be small, which makes it possible to increase the strip laying precision and therefore to reduce the strip consumed.

Selon un exemple de réalisation, le dispositif d'entrainement planétaire comporte :

  • un pignon central solidaire en rotation et coaxial au tambour central, la couronne extérieure étant coaxiale au pignon central,
  • un porte-satellite solidaire en déplacement du rouleau satellite autour du tambour central et coaxial au tambour central, et
  • au moins un pignon satellite monté sur le porte-satellite, engrenant la couronne extérieure et le pignon central pour être entrainé en rotation dans un sens ou dans l'autre autour du tambour central en fonction de la différence des vitesses de rotation du tambour central et de la couronne extérieure.
According to an exemplary embodiment, the planetary drive device comprises:
  • a central pinion integral in rotation and coaxial with the central drum, the outer ring being coaxial with the central pinion,
  • a satellite carrier integral in movement with the satellite roller around the central drum and coaxial with the central drum, and
  • at least one satellite pinion mounted on the planet carrier, meshing the outer ring gear and the central pinion to be driven in rotation in one direction or the other around the central drum according to the difference in the speeds of rotation of the central drum and of the outer crown.

Selon un exemple de réalisation, le rayon primitif du pignon central correspond au rayon extérieur du tambour central.According to an exemplary embodiment, the pitch radius of the central pinion corresponds to the outer radius of the central drum.

Selon un exemple de réalisation, le diamètre du rouleau satellite présente une dimension inférieure à l'interstice radial situé entre le diamètre primitif de la couronne extérieure et le diamètre extérieur du tambour central.According to an exemplary embodiment, the diameter of the satellite roller has a dimension smaller than the radial gap located between the pitch diameter of the outer crown and the outer diameter of the central drum.

Selon un exemple de réalisation, le rouleau satellite est rotatif.According to an exemplary embodiment, the satellite roller is rotatable.

Par exemple, le dispositif d'entrainement planétaire comporte en outre une roue dentée montée sur le porte-satellite, solidaire en déplacement du rouleau satellite et engrenant la couronne extérieure. Le rayon primitif de la roue dentée correspond par exemple au rayon extérieur du rouleau satellite.For example, the planetary drive device further comprises a toothed wheel mounted on the planet carrier, integral in movement with the planet roller and meshing with the outer crown. The pitch radius of the toothed wheel corresponds for example to the outer radius of the satellite roller.

Selon un autre exemple de réalisation, le rouleau satellite est fixé à un porte-satellite du dispositif d'entrainement planétaire, le rouleau satellite étant poreux et présentant une cavité interne configurée pour être mise en communication avec de l'air pressurisé de manière à former un coussin d'air sous la bande à estamper.According to another exemplary embodiment, the satellite roller is fixed to a planet carrier of the planetary drive device, the satellite roller being porous and having an internal cavity configured to be placed in communication with pressurized air so as to form an air cushion under the strip to be stamped.

Selon un exemple de réalisation, le dispositif d'entrainement planétaire comporte un guide solidaire en déplacement du rouleau satellite autour du tambour central, le guide étant susceptible d'être interposé entre deux brins de la bande pré-déroulée pour guider un brin extérieur de ladite bande.According to an exemplary embodiment, the planetary drive device comprises a guide integral in movement with the satellite roller around the central drum, the guide being capable of being interposed between two strands of the pre-unrolled strip to guide an outer strand of said strip.

Selon un exemple de réalisation, le guide comporte entre un et dix, tels que cinq, rouleau(x) satellite(s) additionnel(s), le(s) rouleau(x) satellite(s) additionnel(s) et le rouleau satellite s'inscrivant dans un cercle.According to an exemplary embodiment, the guide comprises between one and ten, such as five, additional satellite roller(s), the additional satellite roller(s) and the roller satellite inscribed in a circle.

Le(s) rouleau(x) satellite(s) additionnel(s) peuvent être rotatif(s).The additional satellite roller(s) may be rotatable.

Le guide comporte par exemple en outre autant de roues dentées que de rouleaux satellites additionnels, les roues dentées étant montées sur le porte-satellite et solidaire(s) en rotation d'un rouleau satellite additionnel respectif et engrenant la couronne extérieure.The guide further comprises for example as many toothed wheels as additional satellite rollers, the toothed wheels being mounted on the planet carrier and integral in rotation with a respective additional satellite roller and meshing with the outer ring.

Selon un autre exemple de réalisation, le guide comporte un élément métallique fixé au porte-satellite, l'élément métallique présentant entre un et dix, tels que cinq pli(s) ou ondulation(s), les pli(s) ou ondulation(s) et le rouleau satellite s'inscrivant dans un cercle.According to another exemplary embodiment, the guide comprises a metal element fixed to the planet carrier, the metal element having between one and ten, such as five fold(s) or undulation(s), the fold(s) or undulation( s) and the satellite roll fitting into a circle.

Selon un exemple de réalisation, le diamètre dudit cercle correspond au diamètre primitif de la couronne extérieure.According to an exemplary embodiment, the diameter of said circle corresponds to the pitch diameter of the outer crown.

Selon un exemple de réalisation, la couronne extérieure est configurée pour être entrainée en rotation à une vitesse constante sensiblement égale à une valeur moyenne de la vitesse d'avance variable.According to an exemplary embodiment, the outer crown is configured to be driven in rotation at a constant speed substantially equal to an average value of the variable advance speed.

Selon un exemple de réalisation, l'axe du tambour central est susceptible d'être entrainé en rotation à une vitesse d'avance variable par un moteur du dispositif de déroulage de bande pour former un arbre d'avance. On réduit ainsi le nombre de pièces.According to an exemplary embodiment, the axis of the central drum is capable of being driven in rotation at a variable advance speed by a motor of the strip unwinding device to form an advance shaft. This reduces the number of parts.

L'invention a aussi pour objet une machine d'estampage d'éléments en forme de feuilles configurée pour déposer sur chaque feuille de la pellicule dorée ou métallisée issue d'au moins une bande à estamper, caractérisée en ce qu'elle comporte en outre au moins un dispositif de déroulage de bande tel que décrit précédemment.The subject of the invention is also a machine for stamping elements in the form of sheets configured to deposit on each sheet gold or metallized film from at least one strip to be stamped, characterized in that it further comprises at least one device tape unwinding as previously described.

DESCRIPTION SOMMAIRE DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

D'autres avantages et caractéristiques apparaîtront à la lecture de la description de l'invention, ainsi que sur les figures annexées qui représentent un exemple de réalisation non limitatif de l'invention et sur lesquelles :

  • La Figure 1 illustre de façon très schématique un exemple d'une machine d'estampage.
  • La Figure 2 montre une vue en perspective d'un dispositif de déroulage de bande de la machine d'estampage de la Figure 1 (avec un boitier représenté en transparence).
  • La Figure 3 montre une autre vue du dispositif de déroulage de bande de la Figure 2.
  • La Figure 4 montre une vue en coupe longitudinale d'éléments du dispositif de déroulage de bande de la Figure 2.
  • La Figure 5 montre une vue en coupe transversale A-A d'éléments du dispositif de déroulage de bande de la Figure 4.
  • La Figure 6 montre une vue en perspective d'un tambour central et d'un pignon central du dispositif de déroulage de bande de la Figure 2.
  • La Figure 7 montre une vue en perspective d'une couronne extérieure et d'un support du dispositif de déroulage de bande de la Figure 2.
  • La Figure 8 montre une vue en perspective d'un dispositif d'entrainement planétaire du dispositif de déroulage de bande de la Figure 2.
  • La Figure 9 montre une autre vue du dispositif d'entrainement planétaire de la Figure 8.
  • La Figure 10 montre une vue en coupe transversale du dispositif de déroulage de bande de la Figure 2 en train de dérouler une bande à estamper, le dispositif de déroulage de bande étant dans une première position extrême.
  • La Figure 11 montre une vue similaire à la Figure 10 dans une deuxième position extrême.
  • La Figure 12 montre une vue en perspective d'éléments d'un dispositif de déroulage de bande selon un deuxième exemple de réalisation.
Other advantages and characteristics will appear on reading the description of the invention, as well as on the appended figures which represent a non-limiting embodiment of the invention and in which:
  • There Figure 1 very schematically illustrates an example of a stamping machine.
  • There Figure 2 shows a perspective view of a tape unwinding device of the stamping machine of the Figure 1 (with a box shown in transparency).
  • There Figure 3 shows another view of the tape unwinding device of the Figure 2 .
  • There Figure 4 shows a longitudinal sectional view of elements of the tape unwinding device of the Figure 2 .
  • There Figure 5 shows a cross-sectional view AA of elements of the tape unwinding device of the Figure 4 .
  • There Figure 6 shows a perspective view of a central drum and a central pinion of the tape unwinding device of the Figure 2 .
  • There Picture 7 shows a perspective view of an outer crown and a support of the tape unwinding device of the Figure 2 .
  • There Figure 8 shows a perspective view of a planetary drive device of the tape unwinding device of the Figure 2 .
  • There Figure 9 shows another view of the planetary drive device of the Picture 8 .
  • There Picture 10 shows a cross-sectional view of the tape unwinding device of the Figure 2 in the process of unwinding a strip to be stamped, the strip unwinding device being in a first extreme position.
  • There Picture 11 shows a view similar to the Picture 10 in a second extreme position.
  • There Picture 12 shows a perspective view of elements of a tape unwinding device according to a second embodiment.

Sur ces figures, les éléments identiques portent les mêmes numéros de référence. Les réalisations suivantes sont des exemples. Bien que la description se réfère à un ou plusieurs modes de réalisation, ceci ne signifie pas nécessairement que chaque référence concerne le même mode de réalisation, ou que les caractéristiques s'appliquent seulement à un seul mode de réalisation. De simples caractéristiques de différents modes de réalisation peuvent également être combinées ou interchangées pour fournir d'autres réalisations.In these figures, identical elements bear the same reference numbers. The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the characteristics apply only to a single mode. of achievement. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.

On définit les termes amont et aval en référence à la direction longitudinale de déplacement des feuilles D (Figure 1). Les feuilles se déplacent d'amont en aval, en suivant généralement l'axe principal longitudinal de la machine, dans un mouvement cadencé par des arrêts périodiques.The terms upstream and downstream are defined with reference to the longitudinal direction of movement of the sheets D ( Figure 1 ). The sheets move from upstream to downstream, generally following the main longitudinal axis of the machine, in a rhythmic movement with periodic stops.

Les termes « éléments en forme de feuilles » et « feuilles » seront considérés comme équivalents, et concerneront aussi bien des éléments composés de carton ondulé que de carton plat, de papier ou de toute autre matière utilisée couramment dans l'industrie de l'emballage. Il est entendu que dans l'ensemble de ce texte, les termes « feuille » ou « élément en feuilles » ou « élément en forme de feuilles » désignent de façon très générale tout support d'impression en forme de feuilles tel que, par exemple, des feuilles de carton, de papier, de matière plastique, etc..The terms "sheet-shaped elements" and "sheets" will be considered equivalent, and will concern elements made of corrugated cardboard as well as flat cardboard, paper or any other material commonly used in the packaging industry. . It is understood that throughout this text, the terms "sheet" or "element in sheets" or "element in the form of sheets" refer very generally to any printing medium in the form of sheets such as, for example , sheets of cardboard, paper, plastic, etc.

Les termes « dessus », « dessous », « bas », « haut », « horizontal » et « vertical » sont définis en référence à la disposition des éléments dans une machine de façonnage posée au sol.The terms "above", "below", "bottom", "top", "horizontal" and "vertical" are defined with reference to the arrangement of the elements in a shaping machine placed on the ground.

La Figure 1 représente un exemple de réalisation d'une machine d'estampage 1 capable de déposer sur chaque feuille de la pellicule dorée ou métallisée issue d'au moins une bande à estamper 2, notamment pour la fabrication d'emballages.There Figure 1 represents an embodiment of a stamping machine 1 capable of depositing on each sheet of the gold or metallized film from at least one strip to be stamped 2, in particular for the manufacture of packaging.

Cette machine 1 est classiquement composée de plusieurs stations de travail 100, 200, 300, 400, 500 qui sont juxtaposées mais interdépendantes une à une pour former un ensemble unitaire à même de traiter une succession d'éléments en forme de feuille. On trouve ainsi un margeur 100, une table de marge 200, une station d'estampage 300, une station d'alimentation de bande 400 ainsi qu'une station de réception 500. Un dispositif de transport 600 est par ailleurs prévu pour déplacer individuellement chaque feuille depuis la sortie de la table de marge 200 jusqu'à la station de réception 500, y compris à travers la station d'estampage 300.This machine 1 is conventionally composed of several workstations 100, 200, 300, 400, 500 which are juxtaposed but interdependent one by one to form a unitary assembly able to process a succession of sheet-like elements. There is thus a feeder 100, a feeder table 200, a stamping station 300, a tape supply station 400 and a receiving station 500. A transport device 600 is also provided to individually move each sheet from the exit of the feed table 200 to the receiving station 500, including through the stamping station 300.

Dans ce mode particulier de réalisation, choisi uniquement à titre d'exemple, les feuilles sont successivement enlevées du dessus d'une pile par un organe de préhension à succion qui les transporte jusqu'à la table de marge 200 directement adjacente.In this particular embodiment, chosen purely by way of example, the sheets are successively removed from the top of a stack by a suction gripper which transports them to the directly adjacent feed table 200 .

Au niveau de la table de marge 200, les feuilles sont mises en nappe par l'organe de préhension à succion, c'est-à-dire posées l'une après l'autre de façon à se chevaucher partiellement. L'ensemble de la nappe est ensuite entraîné en déplacement le long d'un plateau en direction de la station d'estampage 300, au moyen d'un mécanisme de transport à courroies. A l'extrémité de la nappe, la feuille de tête peut être systématiquement positionnée avec précision au moyen de taquets frontaux et latéraux ou par un système à registre.At the level of the feed table 200, the sheets are put into a sheet by the suction gripper, that is to say placed one after the other so as to partially overlap. The entire web is then moved along a platen towards the stamping station 300, by means of a belt transport mechanism. At the end of the web, the head sheet can be systematically positioned with precision by means of frontal and lateral cleats or by a register system.

La station de travail située juste après la table de marge 200 est donc la station d'estampage 300. Cette dernière a pour fonction de déposer sur chaque feuille, par estampage à chaud, de la pellicule métallisée qui est issue d'une bande à estamper 2. Elle utilise pour cela une presse à platines 310 à l'intérieur de laquelle l'opération d'estampage s'opère classiquement, entre une platine supérieure chauffante 320 qui est fixe, et une platine inférieure 330 qui est montée mobile en déplacement suivant un mouvement de va-et-vient vertical.The workstation located just after the margin table 200 is therefore the stamping station 300. The latter has the function of depositing on each sheet, by hot stamping, the metallized film which comes from a strip to be stamped 2. It uses for this a platen press 310 inside which the stamping operation takes place conventionally, between a heated upper platen 320 which is fixed, and a lower platen 330 which is mounted to move along a vertical back-and-forth motion.

La station d'alimentation de bande 400 est chargée d'assurer à la fois l'alimentation de la machine 1 en bande à estamper 2 ainsi que l'évacuation de cette même bande 2 une fois celle-ci usagée après être passée dans la station d'estampage 300.The strip supply station 400 is responsible for ensuring both the supply of the machine 1 with stamping strip 2 as well as the evacuation of this same strip 2 once it has been used after having passed through the station. stamping 300.

Le processus de traitement des feuilles dans la machine d'estampage 1 s'achève dans la station de réception 500 dont la principale fonction est de reconditionner en pile les feuilles préalablement traitées. Pour cela, le dispositif de transport 600 est par exemple agencé de manière à relâcher automatiquement chaque feuille lorsque cette dernière se retrouve au droit de cette nouvelle pile. La feuille tombe alors de façon équerrée sur le dessus de la pile.The process of processing the sheets in the stamping machine 1 ends in the receiving station 500, the main function of which is to repackage the previously processed sheets into a stack. For this, the transport device 600 is for example arranged so as to automatically release each sheet when the latter finds itself in line with this new stack. The sheet then falls squarely on top of the pile.

De manière très classique, le dispositif de transport 600 met en oeuvre une série de barres de pinces qui sont montées mobiles par l'intermédiaire de deux trains de chaîne 620 disposés latéralement de chaque côté de la machine d'estampage 1. Chaque train de chaîne 620 parcourt une boucle qui permet aux barres de pinces de suivre une trajectoire passant successivement par la station d'estampage 300, la station d'alimentation de bande 400 et la station de réception 500.Very conventionally, the transport device 600 implements a series of gripper bars which are movably mounted via two chain trains 620 arranged laterally on each side of the stamping machine 1. Each chain train 620 traverses a loop which allows the gripper bars to follow a trajectory successively passing through the stamping station 300, the tape supply station 400 and the receiving station 500.

L'ensemble des barres de pinces va partir d'une position arrêtée, accélérer, atteindre une vitesse maximale, décélérer, puis s'arrêter, en décrivant ainsi un cycle correspondant au déplacement d'une feuille d'une station de travail à la station de travail suivant. Les trains de chaînes 620 se déplacent et s'arrêtent périodiquement de sorte que, durant chaque déplacement, toutes les barres de pinces en prise avec une feuille sont passées d'une station à la station de travail aval adjacente. Chaque station effectue son travail en synchronisme avec ce cycle que l'on appelle communément cycle machine. Les stations de travail démarrent un nouveau travail à chaque début de cycle machine.The set of gripper bars will start from a stopped position, accelerate, reach a maximum speed, decelerate, then stop, thus describing a cycle corresponding to the movement of a sheet from a work station to the station. next job. Chain trains 620 move and stop periodically so that during each move all of the gripper bars engaged with a sheet are moved from one station to the adjacent downstream work station. Each station performs its work in synchronism with this cycle which is commonly called the machine cycle. Workstations start a new job each time a machine cycle begins.

La station d'alimentation de bande 400 comporte au moins un dispositif de déroulage de bande 10 susceptible d'accumuler de la bande à estamper 2 sous une forme pré-déroulée en aval d'au moins une bobine d'estampage 3 et de délivrer la bande pré-déroulée à chaque sollicitation d'un arbre d'avance de la machine 1.The strip supply station 400 comprises at least one strip unwinding device 10 capable of accumulating the strip to be stamped 2 in a pre-unrolled form downstream of at least one stamping reel 3 and of delivering the pre-rolled tape at each load on a feed shaft of machine 1.

Pour cela, le dispositif de déroulage de bande 10 est interposé entre au moins une bobine d'estampage 3 et la presse à platines 310 (Figure 1).For this, the tape unwinding device 10 is interposed between at least one stamping reel 3 and the platen press 310 ( Figure 1 ).

En outre, comme on peut mieux le voir notamment sur les figures 2 à 11, le dispositif de déroulage de bande 10 comporte un tambour central 11, un rouleau satellite 14 et un dispositif d'entrainement planétaire 15.Furthermore, as can be better seen in particular on the figures 2 to 11 , the tape unwinding device 10 comprises a central drum 11, a satellite roller 14 and a planetary drive device 15.

Le tambour central 11 est configuré pour être entrainé en rotation à une vitesse d'avance variable, solidaire en rotation d'un axe 16 du dispositif de déroulage de bande 10. Sur chaque cycle machine, la vitesse d'avance pilotée par la machine 1 augmente puis diminue (on parle d' « avance ») et s'annule. Ce pas d'avance (avance puis arrêt) fait coïncider la bande à estamper 2 avec une feuille pour la dépose par estampage de la pellicule métallisée selon un programme prédéfini dans la machine 1. Les avances peuvent être identiques ou différentes entre chaque arrêt ou différentes entre au moins deux arrêts successifs et périodiques.The central drum 11 is configured to be driven in rotation at a variable forward speed, integral in rotation with an axis 16 of the tape unwinding device 10. On each machine cycle, the forward speed controlled by the machine 1 increases then decreases (we speak of "advance") and cancels out. This step of advance (advance then stop) causes the band to be stamped 2 to coincide with a sheet for depositing the metallized film by stamping according to a predefined program in the machine 1. The advances can be identical or different between each stop or different between at least two successive and periodic stops.

Le rouleau satellite 14 présente un axe 21 agencé parallèlement à l'axe 16 du tambour central 11. Le rouleau satellite 14 est susceptible de tourner autour du tambour central 11.The satellite roller 14 has an axis 21 arranged parallel to the axis 16 of the central drum 11. The satellite roller 14 is capable of rotating around the central drum 11.

En fonctionnement, la bande pré-déroulée est susceptible de s'enrouler autour du tambour central 11 (sur moins d'un tour) sous l'effet du déplacement du rouleau satellite 14. Plus précisément, la bande pré-déroulée s'enroule autour du tambour central 11 après avoir contourné le rouleau satellite 14 formant un renvoi de la bande pré-déroulée (Figures 10 et 11).In operation, the pre-unrolled strip is likely to wrap around the central drum 11 (over less than one turn) under the effect of the displacement of the satellite roller 14. More specifically, the pre-rolled strip is wrapped around of the central drum 11 after having bypassed the satellite roller 14 forming a return of the pre-unrolled strip ( Figures 10 and 11 ).

Selon un exemple de réalisation, le dispositif d'entrainement planétaire 15 comporte un pignon central 12, une couronne extérieure 13, un porte-satellite 17 et au moins un pignon satellite 20 (Figures 4 et 5).According to an exemplary embodiment, the planetary drive device 15 comprises a central pinion 12, an outer crown 13, a planet carrier 17 and at least one planet pinion 20 ( Figure 4 And 5 ).

Le pignon central 12 est solidaire en rotation du tambour central 11 et il est coaxial au tambour central 11 (Figure 6). Ils sont par exemple fixés à l'axe 16 (Figure 4). Un palier supporte par exemple l'extrémité opposée de l'axe 16.The central pinion 12 is integral in rotation with the central drum 11 and it is coaxial with the central drum 11 ( Figure 6 ). They are for example fixed to the axis 16 ( Figure 4 ). A bearing supports for example the opposite end of the axis 16.

Le rayon primitif du pignon central 12 correspond par exemple au rayon extérieur du tambour central 11 (Figure 6).The pitch radius of the central pinion 12 corresponds for example to the outer radius of the central drum 11 ( Figure 6 ).

La couronne extérieure 13 est dentée (Figure 7). Elle est coaxiale au pignon central 12 et est configurée pour être entrainée en rotation à vitesse constante. On entend par « constante », une vitesse sensiblement constante, c'est-à-dire par exemple variant sur moins de +/- 10% d'une vitesse moyenne. La vitesse constante est par exemple sensiblement égale à une valeur moyenne de la vitesse d'avance variable.The outer crown 13 is toothed ( Picture 7 ). It is coaxial with the central pinion 12 and is configured to be driven in rotation at constant speed. The term "constant" means a substantially constant speed, that is to say for example varying over less than +/- 10% of an average speed. The constant speed is for example substantially equal to an average value of the variable forward speed.

Le sens de rotation de la couronne extérieure 13 est contraire au sens de rotation du tambour central 11. Le sens de rotation de la couronne extérieure 13 est choisi pour que la rotation de la couronne extérieure 13 déroule la bobine d'estampage 3.The direction of rotation of the outer crown 13 is opposite to the direction of rotation of the central drum 11. The direction of rotation of the outer crown 13 is chosen so that the rotation of the outer crown 13 unwinds the stamping reel 3.

La couronne extérieure 13 est par exemple portée par un support 19 monté en rotation sur l'axe 16 au moyen d'un roulement (Figure 4). Dans la direction axiale, le pignon central 12 est interposé entre le tambour central 11 et le support 19 de la couronne extérieure 13.The outer ring 13 is for example carried by a support 19 rotatably mounted on the axis 16 by means of a bearing ( Figure 4 ). In the axial direction, the central pinion 12 is interposed between the central drum 11 and the support 19 of the outer crown 13.

Le rouleau satellite 14 présente par exemple un diamètre de dimension inférieure à l'interstice radial situé entre le diamètre primitif de la couronne extérieure 13 et le diamètre extérieur du tambour central 11, ce qui permet à un brin intérieur de la bande à estamper 2 s'enroulant sur le tambour central 11 de s'interposer sans se coincer entre le rouleau satellite 14 et le tambour central 11.The satellite roller 14 has, for example, a diameter of a dimension smaller than the radial gap located between the pitch diameter of the outer ring 13 and the outer diameter of the central drum 11, which allows an inner strand of the strip to be stamped 2 s 'rolling on the central drum 11 to interpose without getting stuck between the satellite roller 14 and the central drum 11.

Le porte-satellite 17 est solidaire en déplacement du rouleau satellite 14 autour du tambour central 11 et coaxial au tambour central 11. Le porte-satellite 17 est par exemple monté en rotation sur l'axe 16 au moyen d'un roulement (Figure 4).The planet carrier 17 is integral in movement with the planet roller 14 around the central drum 11 and coaxial with the central drum 11. The planet carrier 17 is for example rotatably mounted on the axis 16 by means of a bearing ( Figure 4 ).

A titre d'exemple, le porte-satellite 17 est formé d'une part d'un disque 17a, par exemple plein, présentant un roulement au centre et d'autre part, d'une couronne 17b fixée coaxialement au disque 17a et portant des paliers pour les axes du au moins un pignon satellite 20 et le cas échéant, et comme on le verra plus tard de roues dentées 18 et 24 (Figures 4, 8 et 9).By way of example, the planet carrier 17 is formed on the one hand by a disc 17a, for example solid, having a bearing in the center and on the other hand, by a crown 17b fixed coaxially to the disc 17a and carrying bearings for the axes of at least one satellite pinion 20 and, if necessary, and as will be seen later, toothed wheels 18 and 24 ( Figure 4 , 8 and 9 ).

Le au moins un pignon satellite 20 est monté sur le porte-satellite 17. Il engrène d'une part, la couronne extérieure 13 et d'autre part, le pignon central 12 pour être entrainé en rotation dans un sens ou dans l'autre autour du tambour central 11 en fonction de la différence des vitesses de rotation du tambour central 11 et de la couronne extérieure 13. Le déplacement du au moins un pignon satellite 20 entraine le déplacement du rouleau satellite 14 autour du tambour central 11 ce qui fait varier la longueur de la bande pré-déroulée.The at least one satellite pinion 20 is mounted on the planet carrier 17. It meshes on the one hand, the outer crown 13 and on the other hand, the central pinion 12 to be driven in rotation in one direction or the other around the central drum 11 as a function of the difference in the speeds of rotation of the central drum 11 and of the outer ring 13. The movement of the at least one satellite pinion 20 causes the movement of the satellite roller 14 around the central drum 11 which varies the length of the pre-rolled strip.

Le dispositif d'entrainement planétaire 15 comporte par exemple quatre pignons satellites 20 montés sur le porte-satellite 17, par exemple inscrits dans une forme en croix (Figures 5, 8 et 9).The planetary drive device 15 comprises for example four planet pinions 20 mounted on the planet carrier 17, for example inscribed in a cross shape ( Figure 5 , 8 and 9 ).

Les pignons satellites 20 transmettent les entrainements de la couronne extérieure 13 et du pignon central 12 au porte-satellite 17 solidaire en déplacement du rouleau satellite 14. Les pignons satellites 20 ne sont eux-mêmes reliés à aucun rouleau satellite.The planet gears 20 transmit the drives of the outer crown 13 and of the central pinion 12 to the planet carrier 17 integral in movement with the planet roller 14. The planet gears 20 are not themselves connected to any planet roller.

Le diamètre du au moins un pignon satellite 20 est par exemple sensiblement plus grand que le diamètre du rouleau satellite 14.The diameter of at least one satellite pinion 20 is for example substantially larger than the diameter of the satellite roller 14.

Les pignons satellites 20, le pignon central 12 et la couronne extérieure 13 sont agencés à une extrémité de l'axe 16, sensiblement dans un même plan. Ils sont par exemple reçus dans un boitier 28 (Figures 2 et 3). Cet agencement des engrenages est aussi appelé « train épicycloïdal » ou « entrainement planétaire », le « planétaire intérieur » ou « soleil » étant le pignon central 12, le « planétaire extérieur » ou « couronne » étant la couronne extérieure 13 et le « satellite » engrenant les deux planétaires et tournant autour de leur axe commun étant le pignon satellite 20, l' « axe commun » étant l'axe 16.The satellite pinions 20, the central pinion 12 and the outer ring 13 are arranged at one end of the shaft 16, substantially in the same plane. They are, for example, received in a box 28 ( Figure 2 And 3 ). This arrangement of gears is also called "planetary train" or "planetary drive", the "inner planetary" or "sun" being the central pinion 12, the "outer planetary" or "crown" being the outer crown 13 and the "satellite meshing the two sun gears and rotating around their common axis being the planet pinion 20, the "common axis" being the axis 16.

Selon un exemple de réalisation, le rouleau satellite 14 est rotatif, et peut tourner sur lui-même autour de son axe 21. La bande à estamper 2 peut ainsi s'enrouler sans frottements autour du rouleau satellite 14.According to an exemplary embodiment, the satellite roller 14 is rotatable, and can turn on itself around its axis 21. The strip to be stamped 2 can thus be rolled up without friction around the satellite roller 14.

Selon un exemple de réalisation, le dispositif d'entrainement planétaire 15 comporte en outre une roue dentée 18 montée sur le porte-satellite 17, solidaire en déplacement du rouleau satellite 14 et engrenant la couronne extérieure 13. La roue dentée 18 et le rouleau satellite 14 sont par exemple montés sur l'axe 21 à une extrémité du rouleau satellite 14 (Figure 4). Un palier supporte par exemple l'extrémité opposée de l'axe 21 du rouleau satellite 14. Le rayon primitif de la roue dentée 18 correspond par exemple au rayon extérieur du rouleau satellite 14. La vitesse de rotation circonférentielle du rouleau satellite 14 correspond alors à la vitesse de rotation de la couronne extérieure 13 à laquelle la bande à estamper 2 est déroulée de la bobine d'estampage 3. La bande à estamper 2 peut ainsi être entrainée par le rouleau satellite 14 à la même vitesse qu'elle est dévidée de la bobine d'estampage 3.According to an exemplary embodiment, the planetary drive device 15 further comprises a toothed wheel 18 mounted on the planet carrier 17, integral in movement with the planet roller 14 and meshing with the outer crown 13. The toothed wheel 18 and the planet roller 14 are for example mounted on the axis 21 at one end of the satellite roller 14 ( Figure 4 ). A bearing supports for example the opposite end of the axis 21 of the satellite roller 14. The pitch radius of the toothed wheel 18 corresponds for example to the outer radius of the satellite roller 14. The circumferential speed of rotation of the satellite roller 14 then corresponds to the speed of rotation of the outer crown 13 at which the strip to be stamped 2 is unwound from the stamping reel 3. The strip to be stamped 2 can thus be driven by the satellite roller 14 at the same speed as it is unwound from the stamping coil 3.

Selon un autre exemple de réalisation, le rouleau satellite 14 est non rotatif. Il est par exemple fixé au porte-satellite 17. Dans ce cas, le rouleau satellite 14 peut être poreux et présenter une cavité interne configurée pour être mise en communication avec de l'air pressurisé de manière à former un coussin d'air sous la bande à estamper 2 pour que la bande à estamper 2 puisse s'enrouler sans frottements autour du rouleau satellite 14.According to another exemplary embodiment, the satellite roller 14 is non-rotating. It is for example fixed to the planet carrier 17. In this case, the planet roller 14 can be porous and have an internal cavity configured to be placed in communication with pressurized air so as to form an air cushion under the stamping strip 2 so that the stamping strip 2 can be rolled up without friction around the satellite roller 14.

Selon un exemple de réalisation, le dispositif d'entrainement planétaire 15 comporte en outre un guide 22 solidaire en déplacement du rouleau satellite 14 autour du tambour central 11 (Figures 8 et 9).According to an exemplary embodiment, the planetary drive device 15 further comprises a guide 22 integral in movement with the satellite roller 14 around the central drum 11 ( Figures 8 and 9 ).

Le guide 22 est susceptible d'être interposé entre deux brins de la bande pré-déroulée 2, un brin intérieur de la bande à estamper 2 étant contre le tambour central 11 et un brin extérieur, pour guider un brin extérieur de la bande (Figure 10 et 11).The guide 22 is capable of being interposed between two strands of the pre-unrolled strip 2, an inner strand of the strip to be stamped 2 being against the central drum 11 and an outer strand, to guide an outer strand of the strip ( Figure 10 and 11 ).

Selon un exemple de réalisation, le guide 22 comporte entre un et dix, tels que cinq, rouleau(x) satellite(s) additionnel(s) 23, le(s) rouleau(x) satellite(s) additionnel(s) 23 et le rouleau satellite 14 s'inscrivant dans un cercle C (Figure 9). Les rouleaux satellites additionnels 23 et le rouleau satellite 14 sont par exemple régulièrement espacés, par exemple sur un arc de cercle compris entre 90° et 180°. Le guide 22 peut en outre comporter un élément de maintien 34 pour maintenir et guider les extrémités opposées des rouleaux satellites additionnels 23 autour de l'axe 16.According to an exemplary embodiment, the guide 22 comprises between one and ten, such as five, additional satellite roller(s) 23, the additional satellite roller(s) 23 and the satellite roller 14 being part of a circle C ( Figure 9 ). The additional satellite rollers 23 and the satellite roller 14 are for example regularly spaced, for example on an arc of a circle between 90° and 180°. The guide 22 may further comprise a holding element 34 to hold and guide the opposite ends of the additional satellite rollers 23 around the axis 16.

Le(s) rouleau(x) satellite(s) additionnel(s) 23 peu(ven)t être rotatif(s). Le brin extérieur de la bande pré-déroulée peut ainsi glisser sur les rouleaux satellite additionnels 23 rotatifs quasiment sans frottements.The additional satellite roller(s) 23 can be rotatable. The outer strand of the pre-unrolled strip can thus slide on the additional rotary satellite rollers 23 almost without friction.

Sur l'exemple des Figures 1 à 11, le guide 22 comporte entre un et dix, tels que cinq, rouleaux satellites additionnels 23 rotatifs et autant de roues dentées 24 montées sur le porte-satellite 17 (Figure 5 et 8). Les roues dentées 24 sont solidaires en rotation d'un rouleau satellite additionnel 23 respectif. Elles sont montées à une extrémité axiale d'un rouleau satellite additionnel 23 respectif et engrènent la couronne extérieure 13. Un palier peut supporter l'extrémité opposée de chaque rouleau satellite additionnel 23.On the example of Figures 1 to 11 , the guide 22 comprises between one and ten, such as five, additional rotary planet rollers 23 and as many toothed wheels 24 mounted on the planet carrier 17 ( Figure 5 And 8 ). The toothed wheels 24 are integral in rotation with an additional satellite roller 23 respectively. They are mounted at one axial end of a respective additional satellite roller 23 and mesh with the outer crown 13. A bearing can support the opposite end of each additional satellite roller 23.

Les rouleaux satellites additionnels 23 et les roues dentées 24 présentent par exemple des diamètres de dimensions similaires au rouleau satellite 14. Le brin intérieur de la bande à estamper 2 peut ainsi s'interposer sans se coincer entre d'une part, le rouleau satellite 14 et les rouleaux satellites additionnels 23 et d'autre part, le tambour central 11.The additional satellite rollers 23 and the toothed wheels 24 have, for example, diameters of dimensions similar to the satellite roller 14. The inner strand of the strip to be stamped 2 can thus be interposed without getting stuck between, on the one hand, the satellite roller 14 and the additional satellite rollers 23 and on the other hand, the central drum 11.

Le diamètre dudit cercle C correspond par exemple sensiblement au diamètre primitif de la couronne extérieure 13. La vitesse de rotation circonférentielle des rouleaux satellites additionnels 23 correspond à la vitesse de rotation de la couronne extérieure 13 à laquelle la bande à estamper 2 est déroulée de la bobine d'estampage 3. La bande à estamper 2 peut ainsi être entrainée par les rouleaux satellites additionnels 23 à la même vitesse qu'elle est dévidée de la bobine d'estampage 3.The diameter of said circle C corresponds for example substantially to the pitch diameter of the outer crown 13. The circumferential rotational speed of the additional satellite rollers 23 corresponds to the rotational speed of the outer crown 13 at which the strip to be stamped 2 is unwound from the stamping reel 3. The strip to be stamped 2 can thus be driven by the additional satellite rollers 23 at the same speed as it is unwound from the stamping reel 3.

La bande à estamper 2 provenant de la bobine d'estampage 3 peut ainsi être guidée par les rouleaux satellites additionnels 23 de sorte que le brin extérieur suive approximativement le diamètre primitif de la couronne extérieure 13, le brin extérieur étant sensiblement parallèlement au brin intérieur de la bande s'enroulant autour du tambour central 11. Plus il y a de rouleaux satellites additionnels 23 et plus le guidage du brin extérieur est proche d'un cercle, ce qui permet d'éviter un déroulement par à-coups de la bande.The strip 2 to be stamped coming from the stamping reel 3 can thus be guided by the additional satellite rollers 23 so that the outer strand approximately follows the pitch diameter of the outer crown 13, the outer strand being substantially parallel to the inner strand of the strip winding around the central drum 11. The more additional satellite rollers 23 there are, the more the guiding of the outer strand is close to a circle, which makes it possible to avoid jerky unwinding of the strip.

Le guide 22 peut en outre comporter une plaque 32, ou des éléments de plaque, fixée au porte-satellite 17 en arc de cercle pour guider le brin intérieur de la bande à estamper 2 contre le tambour central 11 (Figures 8 à 11).The guide 22 may further comprise a plate 32, or plate elements, fixed to the satellite carrier 17 in an arc of a circle to guide the inner strand of the strip to be stamped 2 against the central drum 11 ( Figures 8 to 11 ).

Entre la bobine d'estampage 3 et le dispositif de déroulage de bande 10, la bande à estamper 2 est par exemple orientée tangentiellement aux rouleaux satellites additionnels 23 par un renvoi d'entrée 26. En sortie du dispositif de déroulage de bande 10, la bande à estamper 2 peut être renvoyée à l'horizontale par un renvoi de sortie 27 pour guider la bande 2 à plat dans la presse à platines 310 (Figure 1).Between the stamping reel 3 and the tape unwinding device 10, the strip to be stamped 2 is for example oriented tangentially to the additional satellite rollers 23 by an entry return 26. At the exit of the strip unwinding device 10, the strip to be stamped 2 can be returned to the horizontal by an exit return 27 to guide the strip 2 flat in the platen press 310 ( Figure 1 ).

Selon un exemple de réalisation, on prévoit que le dispositif de déroulage de bande 10 comporte un moteur 25 configuré pour entrainer l'axe 16 du tambour central 11 à une vitesse d'avance variable (Figures 3 et 4). Le moteur 25 est par exemple en liaison directe avec l'extrémité de l'axe 16. L'axe 16 solidaire en rotation du tambour central 11 pour dérouler la bande à estamper 2 forme ainsi également l'arbre d'avance. On réduit ainsi le nombre de pièces.According to an exemplary embodiment, provision is made for the tape unwinding device 10 to comprise a motor 25 configured to drive the axis 16 of the central drum 11 at a variable forward speed ( Figures 3 and 4 ). The motor 25 is for example in direct connection with the end of the axis 16. The axis 16 integral in rotation with the central drum 11 to unwind the strip to be stamped 2 thus also forms the advance shaft. This reduces the number of parts.

Le dispositif de déroulage de bande 10 peut en outre comporter un galet d'avance 29 pressant le tambour central 11 pour garantir une bonne transmission entre la bande à estamper 2 et le tambour central 11 (Figure 1).The strip unwinding device 10 may further comprise a feed roller 29 pressing the central drum 11 to guarantee good transmission between the strip to be stamped 2 and the central drum 11 ( Figure 1 ).

La couronne extérieure 13 peut être entrainée en rotation à vitesse constante par un moteur supplémentaire 31 du dispositif de déroulage de bande 10 (Figure 3). Le moteur supplémentaire 31 entraine la couronne extérieure 13 par exemple via un système à poulies.The outer ring 13 can be rotated at constant speed by an additional motor 31 of the tape unwinding device 10 ( Figure 3 ). The additional motor 31 drives the outer crown 13 for example via a pulley system.

En fonctionnement, la couronne extérieure 13 est entrainée en rotation à vitesse constante, par exemple à une vitesse de rotation sensiblement égale à une valeur moyenne de la vitesse d'avance variable (dans le sens antihoraire sur l'exemple des Figures 10 et 11).In operation, the outer crown 13 is driven in rotation at constant speed, for example at a speed of rotation substantially equal to an average value of the variable advance speed (in the counterclockwise direction on the example of the Figures 10 and 11 ).

Lorsque la vitesse d'avance est nulle (Figure 10), le rouleau satellite 14 est entrainé (ici dans le sens de rotation antihoraire) autour du tambour central 11 par la couronne extérieure 13. Le déplacement du rouleau satellite 14 a pour effet d'augmenter la longueur de bande pré-déroulée et ainsi la réserve de bande accumulée. La Figure 10 illustre ainsi une première position extrême du rouleau satellite 14 pour laquelle la réserve de bande pré-déroulée est maximale. Pendant que le rouleau satellite 14 se déplace autour du tambour central 11 pour atteindre cette première position extrême, une dépose de pellicule dorée ou métallisée est réalisée sur une feuille dans la presse à platines 310.When the feed rate is zero ( Picture 10 ), the satellite roller 14 is driven (here in the direction of counterclockwise rotation) around the central drum 11 by the outer ring 13. The movement of the satellite roller 14 has the effect of increasing the length of pre-unrolled strip and thus the accumulated tape reserve. There Picture 10 thus illustrates a first extreme position of the satellite roller 14 for which the reserve of pre-unrolled strip is maximum. While the satellite roller 14 is moving around the central drum 11 to reach this first extreme position, a deposit of gold or metallic film is carried out on a sheet in the platen press 310.

Puis, lorsque la vitesse d'avance augmente (Figure 11), le tambour central 11 est entrainé en rotation dans le sens contraire de la couronne extérieure 13 (dans le sens horaire sur la Figure 11) entrainant la rotation du rouleau satellite 14 dans le même sens, ce qui diminue la longueur de bande pré-déroulée qui est délivrée à la station d'estampage 400. La Figure 11 montre un exemple d'une deuxième position extrême du rouleau satellite 14 pour laquelle la réserve de bande pré-déroulée est minimale.Then, as the feed rate increases ( Picture 11 ), the central drum 11 is rotated in the opposite direction to the outer ring 13 (clockwise on the Picture 11 ) causing the rotation of the satellite roller 14 in the same direction, which reduces the length of pre-unrolled strip which is delivered to the stamping station 400. The Picture 11 shows an example of a second extreme position of the satellite roller 14 for which the reserve of pre-unrolled tape is minimal.

Puis la vitesse d'avance diminue jusqu'à s'arrêter. Par voie de conséquence, le rouleau satellite 14 est entrainé (ici dans le sens de rotation antihoraire) autour du tambour central 11 par la couronne extérieure 13 jusqu'à revenir à la première position extrême (Figure 10). Un nouveau cycle machine reprend et ainsi de suite.Then the feed rate decreases until it stops. Consequently, the satellite roller 14 is driven (here in the direction of counterclockwise rotation) around the central drum 11 by the outer crown 13 until it returns to the first extreme position ( Picture 10 ). A new machine cycle resumes and so on.

La bande à estamper 2 peut ainsi être pré-déroulée à vitesse constante de la bobine d'estampage 3, tirée par le rouleau satellite 14. La bande peut être délivrée en sortie du dispositif de déroulage de bande 10 à la vitesse d'avance variable donnée par le tambour central 11. La longueur de bande à estamper 2 accumulée varie avec le déplacement angulaire du rouleau satellite 14 autour du tambour central 11 qui lui varie, du fait de l'entrainement planétaire, en fonction de la différence des vitesses de rotation du tambour central 11 et de la couronne extérieure 13. Il est ainsi possible d'accumuler de la bande à estamper 2 puis de délivrer la bande à estamper 2 accumulée à chaque sollicitation de l'arbre d'avance.The strip 2 to be stamped can thus be pre-unrolled at constant speed from the stamping reel 3, pulled by the satellite roller 14. The strip can be delivered at the exit from the strip unwinding device 10 at the variable feed given by the central drum 11. The accumulated length of strip 2 to be stamped varies with the angular displacement of the satellite roller 14 around the central drum 11 which varies, due to the planetary drive, as a function of the difference in rotational speeds of the central drum 11 and of the outer crown 13. It is thus possible to accumulate strip 2 to be stamped and then to deliver the strip 2 to be stamped accumulated at each request of the advance shaft.

Plusieurs bobines 3 peuvent en outre être déroulées avec le dispositif de déroulage de bande 10 si celles-ci sont délivrées à la station d'estampage 300 avec la même vitesse d'avance.Several coils 3 can also be unwound with the tape unwinding device 10 if these are delivered to the stamping station 300 with the same feed speed.

On comprend que le dispositif de déroulage de bande 10 est plus compact qu'un système « linéaire » de l'art antérieur car il peut être intégré directement dans la machine 1. Il est en outre plus robuste et plus facile à mettre en oeuvre. La distance entre la bobine 3 et la presse 310 peut être faible, ce qui permet d'augmenter la précision de dépose de bande et donc de réduire la bande consommée. Le déroulement de la bobine d'estampage 3 peut continuer à être freiné en production par un dispositif de freinage pour garantir une tension de bande minimale mais de manière beaucoup plus douce, ce qui permet d'éviter les à-coups qui peuvent détériorer la bande.It is understood that the tape unwinding device 10 is more compact than a “linear” system of the prior art because it can be integrated directly into the machine 1. It is also more robust and easier to implement. The distance between the reel 3 and the press 310 can be small, which makes it possible to increase the strip laying precision and therefore to reduce the strip consumed. The unwinding of the stamping reel 3 can continue to be braked in production by a braking device to guarantee a minimum strip tension but in a much smoother way, which makes it possible to avoid jerks which can deteriorate the strip .

La Figure 12 illustre un autre exemple de réalisation du dispositif de déroulage de bande 10'.There Picture 12 illustrates another embodiment of the tape unwinding device 10'.

Cet exemple diffère du précédent par le fait qu'ici, le guide 33 comporte un élément métallique, tel qu'une feuille métallique, tel qu'une tôle, présentant entre un et dix, tels que cinq, plis ou ondulations 30.This example differs from the previous one in that here, the guide 33 comprises a metal element, such as a metal sheet, such as a metal sheet, having between one and ten, such as five, folds or undulations 30.

Une extrémité axiale de l'élément métallique est fixée au porte-satellite 17. Le guide 33 peut en outre comporter un élément de maintien 34 pour maintenir et guider l'extrémité opposée de l'élément métallique autour de l'axe 16.One axial end of the metallic element is fixed to the planet carrier 17. The guide 33 may further comprise a holding element 34 to hold and guide the opposite end of the metallic element around the axis 16.

Les plis ou ondulations 30 et le rouleau satellite 14 (dans la direction radiale à l'axe 16) s'inscrivent dans un cercle, coaxial à la couronne extérieure 13. Le diamètre dudit cercle correspond par exemple sensiblement au diamètre primitif de la couronne extérieure 13.The folds or undulations 30 and the satellite roller 14 (in the direction radial to the axis 16) are part of a circle, coaxial with the outer ring 13. The diameter of said circle corresponds for example substantially to the pitch diameter of the outer ring 13.

Les plis ou ondulations 30 sont par exemple régulièrement espacés, par exemple sur un arc de cercle compris entre 90° et 180°.The folds or undulations 30 are for example regularly spaced, for example on an arc of a circle between 90° and 180°.

Le brin extérieur de la bande pré-déroulée peut ainsi glisser sur les plis ou ondulations 30 quasiment sans frottements. La bande à estamper 2 provenant de la bobine d'estampage 3 peut ainsi être guidée par les plis ou ondulations 30 de sorte que le brin extérieur suive approximativement le diamètre primitif de la couronne extérieure 13. Le brin extérieur est alors sensiblement parallèlement au brin intérieur de la bande qui s'enroule autour du tambour central 11. Plus il y a de plis ou ondulations 30 et plus le guidage du brin extérieur est circulaire, ce qui permet d'éviter un déroulement par à-coups de la bande.The outer strand of the pre-rolled strip can thus slide over the folds or undulations 30 almost without friction. The strip 2 to be stamped coming from the stamping reel 3 can thus be guided by the folds or undulations 30 so that the outer strand approximately follows the pitch diameter of the outer crown 13. The outer strand is then substantially parallel to the inner strand of the strip which wraps around the central drum 11. The more folds or undulations 30 there are, the more the guiding of the outer strand is circular, which makes it possible to avoid jerky unwinding of the strip.

Claims (17)

  1. Device for unwinding strips (10) for a stamping machine (1) capable of accumulating the strip to be stamped (2) in a pre-wound form between at least one stamping spool (3) and a platen press (310) of the stamping machine (1),
    the device for unwinding strips (10) comprises:
    - a central drum (11) configured to be rotated at a variable feed rate,
    - a satellite roller (14) having an axis (21) arranged parallel to the axis (16) of the central drum (11), the satellite roller (14) being capable of turning around the central drum (11), the pre-unwound strip being capable of winding around the central drum (11) under the effect of the movement of the satellite roller (14),
    characterised in that
    - the central drum (11) is integral in rotation with an axis (16) of the device for unwinding strips (10),
    and in that the device for unwinding strips (10) further comprises
    - a planetary drive device (15) for moving the satellite roller (14) around the central drum (11) according to the difference in speeds of rotation of the central drum (11) and of an external ring (13) of the planetary drive device (15) configured to be rotated at a constant speed in a direction of rotation that is counter to the direction of rotation of the central drum (11).
  2. Device for unwinding strips (10) according to the preceding claim, characterised in that the planetary drive device (15) comprises:
    - a central pinion (12) integral in rotation and coaxial to the central drum (11), the external ring (13) being coaxial to the central pinion (12),
    - a satellite holder (17) integral in movement with the satellite roller (14) around the central drum (11) and coaxial to the central drum (11), and
    - at least one satellite pinion (20) mounted on the satellite holder (17), meshing the external ring (13) and the central pinion (12) to be rotated in a direction or in the other around the central drum (11) according to the difference in speeds of rotation of the central drum (11) and of the external ring (13).
  3. Device for unwinding strips (10) according to the preceding claim, characterised in that the gear pitch radius of the central pinion (12) corresponds to the external radius of the central drum (11).
  4. Device for unwinding strips (10) according to one of the preceding claims, characterised in that the diameter of the satellite roller (14) has a dimension less that the radial gap located between the gear pitch radius of the external ring (13) and the external diameter of the central drum (11).
  5. Device for unwinding strips (10) according to one of the preceding claims, characterised in that the satellite roller (14) is rotary.
  6. Device for unwinding strips (10) according to the preceding claim, characterised in that the planetary drive device (15) further comprises a toothed wheel (18) mounted on the satellite holder (17), integral in movement with the satellite roller (14) and meshing the external ring (13).
  7. Device for unwinding strips (10) according to the preceding claim, characterised in that the gear pitch radius of the toothed wheel (18) corresponds to the external radius of the satellite roller (14).
  8. Device for unwinding strips according to one of claims 1 to 4, characterised in that the satellite roller (14) is fixed to a satellite holder (17) of the planetary drive device (15), the satellite roller (14) being porous and having an internal cavity configured to be put in communication with pressurised air so as to form an air cushion under the strip to be stamped (2).
  9. Device for unwinding strips (10) according to one of the preceding claims, characterised in that the planetary drive device (15) comprises a guide (22; 33) integral in movement with the satellite roller (14) around the central drum (11), the guide (22; 33) being capable of being interposed between two strands of the pre-unwound strip to guide an external strand of said strip.
  10. Device for unwinding strips (10) according to the preceding claim, characterised in that the guide (22) comprises between one and ten, such as five, additional satellite roller(s) (23), the additional satellite roller(s) (23) and the satellite roller (14) being joined in a circle (C).
  11. Device for unwinding strips (10) according to the preceding claim, characterised in that the additional satellite roller(s) (23) are rotary.
  12. Device for unwinding strips (10) according to the preceding claim, characterised in that the guide (22) further comprises as many toothed wheels (24) as additional satellite rollers (23), the toothed wheels (24) being mounted on the satellite holder (17) and integral in rotation with a respective additional satellite roller (23) and meshing the external ring (13).
  13. Device for unwinding strips (10) according to claim 9, characterised in that the guide (33) comprises a metal element fixed to the satellite holder (17), the metal element having between one and ten, such as five fold(s) or ripple(s) (30), the fold(s) or ripple(s) (30) and the satellite roller (14) being joined in a circle (C).
  14. Device for unwinding strips (10) according to one of claims 10 to 13, characterised in that the diameter of said circle (C) corresponds to the gear pitch diameter of the external ring (13).
  15. Device for unwinding strips (10) according to one of the preceding claims, characterised in that the external ring (13) is configured to be rotated at a constant speed substantially equal to an average value of the variable feed rate.
  16. Device for unwinding strips (10) according to one of the preceding claims, characterised in that the axis (16) of the central drum (11) is capable of being rotated at a variable feed rate by a motor (25) of the device for unwinding strips (10) to form a feed shaft.
  17. Machine (1) for stamping machine elements in the form of sheets configured to deposit a gold or metal film on each sheet from at least one strip to be stamped (2), characterised in that it further comprises at least one device for unwinding strips (10) according to one of the preceding claims.
EP19769382.3A 2018-09-10 2019-09-06 Band unwinding device and machine for stamping sheet-shaped elements Active EP3810537B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18020442 2018-09-10
PCT/EP2019/025298 WO2020052809A1 (en) 2018-09-10 2019-09-06 Device for unwinding strips and machine for stamping elements in sheet form

Publications (2)

Publication Number Publication Date
EP3810537A1 EP3810537A1 (en) 2021-04-28
EP3810537B1 true EP3810537B1 (en) 2023-08-09

Family

ID=63557198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19769382.3A Active EP3810537B1 (en) 2018-09-10 2019-09-06 Band unwinding device and machine for stamping sheet-shaped elements

Country Status (10)

Country Link
US (1) US11180335B2 (en)
EP (1) EP3810537B1 (en)
JP (1) JP7119219B2 (en)
KR (1) KR102320620B1 (en)
CN (1) CN112654571B (en)
BR (1) BR112021001649B1 (en)
ES (1) ES2955716T3 (en)
RU (1) RU2758611C1 (en)
TW (1) TWI719628B (en)
WO (1) WO2020052809A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI804078B (en) * 2020-12-17 2023-06-01 瑞士商巴柏斯特麥克斯合資公司 Sheet processing machine
CN115724262A (en) * 2021-08-31 2023-03-03 宁德时代新能源科技股份有限公司 Roller assembly, manufacturing equipment of battery monomer and adjusting method of roller

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH292425A (en) * 1950-01-10 1953-08-15 Etudes De Machines Speciales Device intended to be interposed between a member for feeding a strip or a flexible wire and a member for using this strip.
SU376247A1 (en) * 1969-07-03 1973-04-05 Проектно конструкторское бюро проектированию оборудовани производства пластических масс , синтетических смол METHOD OF TRANSPORTATION OF BELT MATERIAL
CH690547A5 (en) * 1995-05-08 2000-10-13 Bobst Sa Feed device of a band in the working station stopped, this band arriving continuously.
JPH09309645A (en) 1996-05-21 1997-12-02 Citizen Watch Co Ltd Sheet releasing device of automatic sheet feeder
RU2170209C1 (en) * 2000-05-31 2001-07-10 Зао "Стабо+" Method of and device for making packages from thin tape material
MX2008011461A (en) * 2006-03-09 2008-09-24 Rib Loc Australia Method and apparatus for stabilising strip during winding.
JP5308535B2 (en) * 2008-12-04 2013-10-09 ボブスト ソシエテ アノニム Apparatus for feeding a web substrate to a conversion unit for a feeding station in a packaging machine
WO2012116781A1 (en) 2011-02-28 2012-09-07 Bobst Mex Sa Tape paying out device for stamping machine
EP3016898B1 (en) * 2013-07-01 2017-03-15 Bobst Mex Sa Device for braking a web reel
CN108340663B (en) * 2017-01-23 2020-02-07 长胜纺织科技发展(上海)有限公司 Paperless transfer printing machine

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Publication number Publication date
JP2021527609A (en) 2021-10-14
US20210245985A1 (en) 2021-08-12
BR112021001649B1 (en) 2022-07-26
EP3810537A1 (en) 2021-04-28
ES2955716T3 (en) 2023-12-05
TW202017834A (en) 2020-05-16
WO2020052809A1 (en) 2020-03-19
KR20210032533A (en) 2021-03-24
TWI719628B (en) 2021-02-21
KR102320620B1 (en) 2021-11-02
RU2758611C1 (en) 2021-11-01
BR112021001649A2 (en) 2021-05-04
CN112654571B (en) 2022-03-08
JP7119219B2 (en) 2022-08-16
CN112654571A (en) 2021-04-13
US11180335B2 (en) 2021-11-23

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