EP3895896B1 - Tambour pour un dispositif imprimeur, dispositif imprimeur et procédé de fixation temporaire d'un substrat en forme de papier sur un tambour - Google Patents

Tambour pour un dispositif imprimeur, dispositif imprimeur et procédé de fixation temporaire d'un substrat en forme de papier sur un tambour Download PDF

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Publication number
EP3895896B1
EP3895896B1 EP21167540.0A EP21167540A EP3895896B1 EP 3895896 B1 EP3895896 B1 EP 3895896B1 EP 21167540 A EP21167540 A EP 21167540A EP 3895896 B1 EP3895896 B1 EP 3895896B1
Authority
EP
European Patent Office
Prior art keywords
drum
vacuum
sheet
shell
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21167540.0A
Other languages
German (de)
English (en)
Other versions
EP3895896A1 (fr
Inventor
Alexander GÖDECKE
Stefan Tschorn
Daniel Koster
Matthias Amrein
Tina Baier
Michael Gardon
Josef Kirschbauer
James Zerbel
Franziska Peinze
Arthur Mathea
Alexander MOMBRÉE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of EP3895896A1 publication Critical patent/EP3895896A1/fr
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Publication of EP3895896B1 publication Critical patent/EP3895896B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/106—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine
    • B41F21/108—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine with pneumatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/102—Combinations of transfer drums and grippers with pneumatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/104—Gripper details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/22—Clamps or grippers
    • B41J13/223—Clamps or grippers on rotatable drums
    • B41J13/226—Clamps or grippers on rotatable drums using suction

Definitions

  • the invention relates to a drum for a printing device for printing and for transporting a sheet-shaped substrate, the drum comprising a drum shell that can be driven to rotate about a drum longitudinal axis and has a shell surface on which at least one sheet-shaped substrate can be fixed at least in certain areas.
  • the drum comprises a first, in particular mechanical, fixing device for temporarily fixing a first substrate area of the sheet-like substrate to the drum shell and a vacuum fixing device for temporarily fixing a second substrate area of the sheet-like substrate to the drum shell by means of a vacuum.
  • the invention also relates to a printing device with such a drum.
  • the invention also relates to a method for temporarily fixing a sheet-like substrate to such a drum.
  • a printing device is used, for example, in the production of an identity document, value or security document, in particular in the production of passports.
  • Passports consist of a cover and a passport block which are glued and folded together.
  • the passport book block is made from a sheet, in particular a sheet of paper, from which, after printing, the copies are separated.
  • a sheet can therefore contain a large number of copies, it being possible for only individual copies of the sheet to be printed in an individualized and/or personalized manner.
  • personalized data or information such as place of residence, height, eye color or the name of a religious order or artist is printed on (paper) page one under numbers 11 to 14.
  • the passport book pages or visa pages of the visa sheet remain largely unprinted and only individual passport book pages are provided with a personalized or individualized print, with an inkjet printing device preferably being used for this purpose.
  • a printing device is, for example, from EP 2 657 035 A1 known, which provides a drum for the transport of a sheet-shaped substrate at the das Substrate can be fixed to the lateral surface of the drum by means of a mechanical fixing device, which is equipped with grippers, and by means of a vacuum fixing device, before it is printed with an inkjet printing device.
  • drums for the transport of a sheet-shaped substrate are in US Pat EP 3 016 365 A1 , the U.S. 2009/0 051 747 A1 and the DE 10 2016 207 398 B3 described.
  • the drums only use either mechanical gripping elements or only a vacuum to fix the sheet-like substrate to the drum.
  • a very proven for the purpose of producing identity, value or security documents printing device is in the DE 10 2016 221 192 A1 and in the WO 2018 / 077 927 A1 described by the applicant, which makes it possible to print on both sides of a sheet-shaped substrate. After the first side of the substrate has been printed, the sheet-like substrate is turned by means of deflection rollers before it is also printed on the second side of the substrate.
  • the U.S. 2011/0 025 807 A1 describes a drum that is used in a printing machine, which provides gripper fingers for mechanically fixing the substrate as well as a suction air area to prevent the paper from "raising" during mechanical gripping.
  • U.S. 2009/0 284 561 A1 and US 4,660,825A also described rollers that fix a substrate both with suction air or by means of a vacuum and by means of mechanical fingers.
  • the EP 3 543 015 A1 describes a machine arrangement for the sequential processing of sheet-shaped substrates, with non-impact printing devices being assigned to the drum for transporting the sheet-shaped substrate.
  • the drum according to the invention is characterized in particular by the fact that the vacuum fixing device comprises at least one vacuum insert which is accommodated in a recess in the drum casing and which is mounted to slide along the casing surface concentrically with respect to the longitudinal drum axis between two stops, and which temporarily applies a vacuum on its side of the casing surface for fixing of the second substrate region of the sheet-shaped substrate.
  • the vacuum insert can be used to clamp the substrate onto the lateral surface, as a result of which an improved printed image can be achieved.
  • the arcuate substrate can be clamped with the at least one vacuum insert because it can slide counter to the direction of rotation of the drum or the drum casing, for example driven by gravity due to the acting force of gravity. If the vacuum insert slides against the direction of rotation of the drum, the sheet-like substrate is clamped onto the lateral surface, since it is fixed on the one hand with the first fixing device on the first substrate area and on the other hand it is fixed on the second substrate area with the vacuum insert of the vacuum fixing device.
  • the vacuum insert terminates radially with respect to the longitudinal axis of the drum in a planar manner with the other components of the drum casing.
  • the at least one vacuum insert is supported or acted upon by a spring, and when the spring is designed to exert a restoring force on the vacuum insert in a direction opposite to the direction of rotation of the drum shell.
  • the spring causes an active displacement of the vacuum insert and contributes to the required tension of the sheet-shaped substrate.
  • the vacuum insert can be made particularly compact, so that it can be accommodated in the drum shell or in the recess of the drum shell in a very space-saving manner.
  • the vacuum insert comprises a suction plate that provides the negative pressure on the lateral surface and to which, in an advantageous further development, a connecting piece is fastened which extends radially with respect to the longitudinal axis of the drum through the guide opening protrudes. In this way, it is also possible to actuate the vacuum insert on an inside of the drum shell, ie on a side opposite the shell surface.
  • the vacuum insert preferably has an actuating piece for concentric adjustment of the vacuum insert, with the connecting piece being fastened to this actuating piece.
  • the connecting piece is connected at one end to the suction plate and at the other end to the actuating piece of the vacuum insert.
  • the actuating piece therefore slides on an inside of the drum shell and can also be actuated on the inside of the drum shell.
  • the actuating piece preferably includes a connection which is fluidically connected to suction openings formed in the suction plate radially with respect to the longitudinal axis of the drum, it being possible for a vacuum line to be connected to the connection in a simple manner.
  • a flow path leads from the connection through the actuating piece, through the connecting piece into the suction plate, in which suitable distribution structures are present in order to provide the negative pressure evenly distributed over all suction openings.
  • the actuating piece includes an actuating member which can be actuated by means of an eccentric. By acting on the actuating member by means of the eccentric, the actuating piece and thus the vacuum insert as a whole can be adjusted concentrically between the two stops.
  • An operationally safe adjustment of the vacuum insert can be realized, for example, in that the actuating member is formed from a roller which is rotatably mounted on an axis oriented parallel to the longitudinal axis of the drum.
  • the eccentric is mounted on an eccentric shaft which extends parallel to the longitudinal axis of the drum, which is mounted so that it can rotate to a limited extent about its longitudinal axis and by means of a Switching element can be actuated.
  • the switching element can be actuated externally to the drum, and it has proven to be advantageous if the Switching element is designed to be adjusted by means of a relative to the rotation of the drum shell fixed cam and / or by means of a relative to the rotation of the drum shell fixed linear actuator.
  • the switching element is preferably attached to an end face of the drum and is also formed with a roller.
  • the vacuum insert is provided with improved tribological properties, so that it is advantageous if that surface of the vacuum insert is formed as a sliding surface provided with a friction-reducing coating, which interacts with the surface of the drum shell.
  • a Teflon® coating can be present, with the surfaces of the actuating piece and/or the suction plate and/or the connecting piece being formed as such sliding surfaces with a friction-reducing coating.
  • the friction-reducing coating is characterized by a lower sliding and static friction coefficient compared to the other materials.
  • the vacuum fixing device has a plurality of vacuum inserts arranged parallel to the longitudinal axis of the drum.
  • the advantages and advantageous configurations mentioned in connection with the drum according to the invention apply in the same way to the printing device according to the invention, which is equipped with such a drum.
  • the printing device according to the invention thus comprises this drum and a printing device arranged radially with respect to the drum for printing on a sheet-like substrate fixed on the drum.
  • the printing device comprises a first drum and a first printing device for printing a first side of the sheet-like substrate, and if the printing device has a second drum and a second printing means for printing on a second side of the sheet-shaped substrate.
  • This method creates a particularly efficient, distortion-free fixing of a sheet-like substrate to a drum for subsequent printing.
  • a printing device 200 which serves to print a sheet-shaped substrate 300 .
  • This printing device 200 is used in particular in the production of a German passport.
  • the printing device 200 comprises a first drum 202A and a second drum 202B, which can be driven in opposite directions to one another, continuously or clocked, rotating about their drum longitudinal axes 204.
  • the two drums 202A, 202B are aligned with one another such that a transfer gap 216 is formed between them for transferring the sheet-like substrate 300 from the first drum 202A to the second drum 202B.
  • the drums 202A and 202B have a drum jacket, on the jacket surface 206 of which the sheet-like substrate 300 can be fixed at least in regions.
  • the substrate sheet is fixed on the one hand by means of a mechanical fixing device comprising at least one gripper 208 on a first substrate area 302 and on the other hand by means of a vacuum fixing device 210 comprising at least one vacuum insert 240 on a second substrate area 304 with the aid of a vacuum.
  • a mechanical fixing device comprising at least one gripper 208 on a first substrate area 302
  • a vacuum fixing device 210 comprising at least one vacuum insert 240 on a second substrate area 304 with the aid of a vacuum.
  • the first substrate area 302 and the second substrate area 304 do not overlap; they are preferably spatially separated from one another.
  • the first drum 202A is assigned a first printing device 250A radially, in particular vertically above the drum 202A.
  • the first printing device 250A is, for example, an inkjet printing device comprising a plurality of print heads educated.
  • the second drum 202B is assigned a second printing device 250B radially, in particular vertically above the drum 202B.
  • the second printing device 250B is also formed, for example, as an inkjet printing device comprising a plurality of print heads. In the present case, the two printing devices 250A, 250B are aligned parallel to one another.
  • a sheet feeder 400 configured to feed the sheet substrate 300 to the first drum 202A.
  • a sheet tray 402 for storing the double-sided sheet substrate 300 is provided below the second drum 202B.
  • the sheet feeder 400 and/or the sheet stacker 402 can be height-adjustable, either manually or automatically.
  • the drums 202A, 202B and thus their drum casing can be driven to rotate about their drum longitudinal axis 204, a motor 232 being present for rotating or for driving the drums 202A, 202B.
  • a motor 232 being present for rotating or for driving the drums 202A, 202B.
  • each of the strips 234 is assigned its own gripper 208 of the mechanical fixing device.
  • each of the strips 234 is assigned its own vacuum insert 240 of the vacuum fixing device 210 .
  • the vacuum fixing device 210 is only partially formed on the lateral surface 206 of the drums 202A, 202B and maintains a predetermined distance from the first mechanical fixing device with the at least one gripper 208.
  • a plurality of grippers 208 is fixed there to a fastening rod 212, with the grippers 208 being aligned in particular equidistantly from one another.
  • the fastening rod 212 is mounted by means of a lever 214 such that it can pivot about its longitudinal axis between a first pivot position and a second pivot position. The lever 214 thus opens and closes the grippers fixed to the attachment rod 212 208.
  • the lever 214 which can be actuated by means of a pressure medium, in particular pneumatically or hydraulically, is designed in such a way that the fastening rod 212 can be pivoted between the first pivoted position, in which the at least one gripper 208 is in an open position, and a second pivoted position, in which the at least one gripper 208 is in a closed position.
  • the grippers 208 are in the open position, the sheet-like substrate 300 can be fed to the drum 202A, 202B, with the grippers 208 fixing the sheet-like substrate to the lateral surface 206 of the drum 202A, 202B in the closed position.
  • the adjusting unit for actuating the lever 214 has a linearly adjustable, in particular actuated (hydraulically or pneumatically) piston rod 242 which is pivotally fixed to the lever 214 .
  • both of the drums 202A, 202B are designed to simultaneously fix three of the sheet-like substrates 300 on their lateral surface 206 and to transport them.
  • a different number is possible, whereby the diameter of the drum 202A, 202B and the number of attachment rods 212 with grippers 208 can be adjusted accordingly.
  • a plurality of mechanical fixing devices arranged distributed over the circumference of the drum 202A, 202B and a number of vacuum fixing devices 210 corresponding to the number of mechanical fixing devices can be present.
  • the mounting rod 212 is rotatably mounted on a pivot bracket 218 in the present case.
  • the swivel mounts 218 which are mounted on both sides of the drum 202A, 202B.
  • a first swivel mount 218 is arranged on the first end of the drum 202A, 202B and a second swivel mount 218 is arranged on the second end of the drum 202A, 202B, so that it forms a swivel bracket with the fastening rod 212 form.
  • the first swivel mount 218 is in front of the lateral surface 206 with respect to the drum longitudinal axis 204 and the second swivel mount 218 with respect to the Drum longitudinal axis 204 arranged after the lateral surface 206 of the drum 202A, 202B.
  • This swivel bracket 218 can be adjusted between a raised position, in which the fastening rod 212 protrudes beyond the lateral surface 206 of the drum 202A, 202B (e.g. swivel bracket 218 in the figure below) and a lowered position, in which the fastening rod 212 is at least flush with the lateral surface 206 of the drum 202A, 202B (e.g. swivel brackets 218 in the picture at the top left and right).
  • the swivel mount 218 can also be brought into the raised position, driven by gravity.
  • the pivoting mount 218 can also be adjusted by means of an electric servomotor.
  • the pivoting mount 218 can be adjusted by pressure medium, in particular pneumatically or hydraulically.
  • the swivel mount 218 is guided in a guide groove 244 of the drum 202A, 202B and can be moved between two stops, the guide groove 244 extending tangentially with respect to the lateral surface 206 or along a secant of the circle described by the lateral surface 206.
  • Pivoting mount 218 is also assigned a roller 222, which is configured to interact with a control cam or a stop or a guide bar, for example a guide bar of a machine frame, in such a way that pivoting mount 218 is brought back into guide recess 246 and thus back into its retracted position becomes. It is also possible that there is a kinematic reversal whereby the roller 222 is used to disengage the pivot bracket 218 from the guide recess 246 and into the raised position.
  • the drum 202A, 202B has at least one switching device which is designed to switch the vacuum on the vacuum fixing device 210 only at predetermined angular positions or only within a predetermined range of angular positions of the drum 202A, 202B between an active, a configuration providing suction power on the lateral surface 206 and an inactive configuration preventing the suction power on the lateral surface 206.
  • the fastening rod 212 comprises a recess which is provided with a thread in order to fix the gripper 208 to the fastening rod 212 by means of at least one screw, in this case exactly three screws. A different number of screws is possible.
  • another fixation for the grippers 208 is possible, which can be formed, for example, with rivets, nails or other clamping elements for clamping one end of the gripper.
  • This figure also shows the shape of the grippers 208, which comprise a retaining tab 248 at their free end, ie at their end not arranged on the fastening rod 212.
  • the holding tab 248 is that part of the gripper 208 which fixes the sheet-shaped substrate 300 to its first substrate area 302 .
  • Figure 1 shows the transfer nip 216 in detail with the gripper 208 of the second drum 202B in the open position and with the gripper 208 of the first drum 202A in the closed position.
  • the different pivot positions of the two fastening rods 212 shown can be recognized by the fact that the two piston rods 242 are visible in different lengths and that the two levers 214 also have different pivot positions.
  • the grippers 208 on the fastening rods 212 are offset from one another, with the grippers 208 of the first drum 202A in particular combing with the grippers 208 of the second drum 202B interlock.
  • FIG 7 a sectional view of the printing device 200, in particular the drum 200A, 200B in the area of the vacuum fixing device 210 is shown.
  • the vacuum insert 240 of the vacuum fixing device 210 is accommodated in a recess in the drum casing in the present case flush with the lateral surface 206 of the drum casing.
  • the vacuum insert 240 is slidably mounted along the lateral surface 206 concentrically with respect to the drum longitudinal axis 204 between two stops, temporarily providing a vacuum on its side facing the lateral surface 206 to fix the second substrate region 304 of the sheet-shaped substrate 300.
  • the vacuum insert 240 is composed of several parts and includes a suction plate 254 that provides the negative pressure on the lateral surface 206 .
  • a connecting piece 256 is fastened to this suction plate 254 and is arranged in a guide opening 252 between two stops provided by the drum shell.
  • the guide opening 252 for the vacuum insert 240 is oriented coaxially with respect to the drum longitudinal axis 204, one of the two stops for the vacuum insert 240 being formed from a first end of the guide opening 252, and the other of the two stops for the vacuum insert 240 being formed from a second end of the Guide opening 252 is formed.
  • the connecting piece 256 of the vacuum insert 240 is followed by an actuating piece 258 located on the inner area of the drum shell, which includes a connection 264 to which a vacuum line (not shown) is connected in order to apply a vacuum to the suction plate 254 .
  • the vacuum insert 240 is an in figure 7 associated only vaguely recognizable spring 226, whereby the vacuum insert 240 is pressed against one of the two stops. This is to be understood as a so-called “relaxed” vacuum liner 240 configuration. If, on the other hand, the vacuum insert 240 is adjusted against the spring force of the spring 226, a restoring force is effective, which leads to a so-called “tightened” configuration of the vacuum insert 240.
  • the spring 226 is designed to exert a restoring force on the vacuum insert 240 in a direction opposite to the direction of rotation of the drum shell.
  • FIG. 1 shows a partially sectioned view of the vacuum insert 240, whereby its structure can be seen in more detail.
  • the suction plate 254 of the vacuum insert 240 has a plurality of suction openings 266 arranged in rows, which are fluidly connected to a vacuum space formed within the suction plate 254, which in turn is fluidly connected to the connection 264 to the Creating a negative pressure is connected.
  • the spring 226 is positioned in a spring receptacle formed on the end face of the suction plate 254 .
  • the actuation piece 258 has an actuation member 262, which in the present case is a ball-bearing roller that is mounted on an axis oriented parallel to the longitudinal axis 204 of the drum.
  • the actuating member 262 of the vacuum insert 240 namely the roller of the actuating piece 258, is adjusted.
  • an eccentric 260 is used to adjust the actuating piece 258 and thus the entire vacuum insert 240 concentrically with respect to the longitudinal axis 204 of the drum.
  • the vacuum fixing device 210 has a plurality of vacuum inserts 240 arranged parallel to the longitudinal axis 204 of the drum.
  • each vacuum insert 240 has the actuating member 262 which can be actuated by means of a respective associated eccentric 260 .
  • the eccentrics 260 are attached to a common eccentric shaft 220 and, in particular, are arranged equidistantly on the eccentric shaft 220 .
  • the eccentric shaft 220 extends parallel to the longitudinal axis 204 of the drum and is in particular mounted so that it can rotate to a limited extent about its longitudinal axis.
  • the eccentric shaft 220 can be rotated with this switching element 224, as a result of which the eccentrics 260 arranged thereon also rotate in order to act on the actuating piece 258, in particular the roller.
  • This twisting leads to a concentric adjustment of the vacuum inserts 240 with respect to the drum longitudinal axis 204.
  • the eccentrics 260 have a flattening, so that when the eccentric shaft 220 is rotated with the aid of the eccentric 260, a dead center can be reached, which defines the tensioned configuration of the vacuum insert 240.
  • a sheet-like substrate 300 is temporarily fixed to the lateral surface 206 of the drum casing of the drums 202A, 202B, which drum casing can be driven to rotate about the drum longitudinal axis 204.
  • the sheet-like substrate 300 is fixed to its first substrate area 302 with the grippers 208 of the first fixing device.
  • the drum shell is then rotated further about the drum longitudinal axis 204 until the switching element 224 is aligned with a linear actuator 270 which is stationary relative to the drum rotation and which in turn can be actuated pneumatically or hydraulically, in particular with a pressure medium.
  • This linear actuator 270 adjusts the switching element 224, the eccentric 260 on the eccentric shaft 220 being rotated with the actuating elements 262 until the dead center is reached.
  • the vacuum insert 240 of the vacuum fixing device 210 is prestressed against the force of the spring 226 at the same time.
  • the vacuum insert 240 is adjusted along the lateral surface 206 concentrically with respect to the longitudinal axis 204 of the drum in a direction corresponding to the direction of rotation of the drum shell, the prestressing being maintained due to the dead center reached by the eccentrics 260 ( figure 10 ).
  • a negative pressure is then applied to the suction openings 266 of the vacuum insert 240 so that a second substrate area 304 of the sheet-shaped substrate 300 is sucked by the vacuum insert 240 .
  • the switching element 224 then interacts with a control cam 268 which is fixed relative to the rotation of the drum casing, so that the eccentrics 260 on the eccentric shaft 220 are rotated out of their dead center again.
  • each of the vacuum inserts 240 then slides due to the acting restoring force of the spring 226 in a direction opposite to the direction of rotation of the drum shell, as a result of which the sheet-shaped substrate 300 is clamped onto the shell surface 206 .
  • distortion-free printing can take place with the respective printing device 250A, 250B.

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  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Claims (14)

  1. Tambour (202A, 202B) pour un dispositif d'impression (200) permettant d'imprimer un substrat courbe (300),
    comprenant une enveloppe de tambour pouvant être entraînée en rotation autour d'un axe longitudinal de tambour (204) et présentant une surface d'enveloppe (206) sur laquelle au moins un substrat courbe (300) peut être immobilisé au moins localement,
    avec un premier dispositif d'immobilisation permettant une immobilisation temporaire d'une première zone de substrat (302) du substrat courbe (300) sur l'enveloppe de tambour,
    et avec un dispositif d'immobilisation par dépression (210) permettant d'immobiliser temporairement une seconde zone de substrat (304) du substrat courbe (300) sur l'enveloppe de tambour au moyen d'une dépression,
    dans lequel
    le dispositif d'immobilisation par dépression (210) comprend au moins un insert à vide (240) accueilli dans un évidement de l'enveloppe de tambour et monté coulissant le long de la surface d'enveloppe (206) de manière concentrique par rapport à l'axe longitudinal de tambour (204) entre deux butées et fournissant de manière temporaire sur son côté de la surface d'enveloppe (206) une dépression permettant l'immobilisation de la seconde zone de substrat (304), caractérisé en ce que le au moins un insert à vide (240) est soutenu par un ressort (226), et en ce que le ressort (226) est conçu pour exercer une force de rappel sur l'insert à vide (240) dans une direction opposée à la direction de rotation de l'enveloppe de tambour.
  2. Tambour (202A, 202B) selon la revendication 1, caractérisé en ce qu'un orifice de guidage (252) destiné à l'insert à vide (240) et orienté de manière coaxiale par rapport à l'axe longitudinal de tambour (204) est prévu dans l'évidement de l'enveloppe de tambour, en ce que l'une des deux butées destinées à l'insert à vide (240) est formée d'une première extrémité de l'orifice de guidage (252), et en ce que l'autre des deux butées destinées à l'insert à vide (240) est formée d'une seconde extrémité de l'orifice de guidage (252).
  3. Tambour (202A, 202B) selon la revendication 2, caractérisé en ce que l'insert à vide (240) comprend une plaque d'aspiration (254) fournissant la dépression au niveau de la surface d'enveloppe (206) et sur laquelle est fixée une pièce de liaison (256) faisant saillie à travers l'orifice de guidage (252) de manière radiale par rapport à l'axe longitudinal de tambour (204).
  4. Tambour (202A, 202B) selon la revendication 3, caractérisé en ce que l'insert à vide (240) comprend une pièce d'actionnement (258) permettant un réglage concentrique de l'insert à vide (240) et au niveau de laquelle la pièce de liaison (256) est fixée.
  5. Tambour (202A, 202B) selon la revendication 4, caractérisé en ce que la pièce d'actionnement (258) comprend un raccord (264) relié fluidiquement à des orifices d'aspiration (266) réalisés dans la plaque d'aspiration (254) de manière radiale par rapport à l'axe longitudinal de tambour (204).
  6. Tambour (202A, 202B) selon la revendication 4 ou 5, caractérisé en ce que la pièce d'actionnement (258) comprend un élément d'actionnement (262) pouvant être actionné au moyen d'un excentrique (260).
  7. Tambour (202A, 202B) selon la revendication 6, caractérisé en ce que l'élément d'actionnement (262) est formé d'un rouleau monté rotatif sur un axe orienté parallèlement par rapport à l'axe longitudinal de tambour (204).
  8. Tambour (202A, 202B) selon la revendication 6 ou 7, caractérisé en ce que l'excentrique (260) est mis en place sur un arbre excentrique (220) s'étendant parallèlement à l'axe longitudinal de tambour (204) et monté de manière à pouvoir tourner de manière limitée autour de son axe longitudinal et pouvant être actionné au moyen d'un organe de commutation (224).
  9. Tambour (202A, 202B) selon la revendication 8, caractérisé en ce que l'organe de commutation (224) est conçu pour être déplacé au moyen d'une came de commande (268) fixe par rapport à la rotation de l'enveloppe de tambour et/ou au moyen d'un actionneur linéaire (270) fixe par rapport à la rotation de l'enveloppe de tambour.
  10. Tambour (202A, 202B) selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la surface de l'insert à vide (240) est réalisée sous la forme d'une surface de coulissement interagissant avec la surface de l'enveloppe de tambour et munie d'un revêtement réduisant le frottement.
  11. Tambour (202A, 202B) selon l'une quelconque des revendications 1 à 10, caractérisé en ce que le dispositif d'immobilisation par dépression (210) présente une pluralité d'inserts à vide (240) agencés parallèlement à l'axe longitudinal de tambour (204).
  12. Dispositif d'impression (200) comprenant un tambour (202A, 202B) selon l'une quelconque des revendications 1 à 11 et un appareil d'impression (250A, 250B) agencé de manière radiale par rapport au tambour (202A, 202B) et permettant d'imprimer un substrat courbe (300) immobilisé sur le tambour (202A, 202B).
  13. Dispositif d'impression (200) selon la revendication 12, caractérisé par un premier tambour (202A) selon l'une quelconque des revendications 1 à 11 et un premier appareil d'impression (250A) permettant d'imprimer un premier côté du substrat courbe (300), et par un second tambour (202B) selon l'une quelconque des revendications 1 à 11 et un second appareil d'impression (250B) permettant d'imprimer un second côté du substrat courbe (300).
  14. Procédé d'immobilisation temporaire d'un substrat courbe (300) sur une surface d'enveloppe (206) d'une enveloppe de tambour, pouvant être entraînée en rotation autour d'un axe longitudinal de tambour (204), d'un tambour (202A, 202B) selon l'une quelconque des revendications 1 à 11, comprenant les étapes consistant à :
    - immobiliser une première zone de substrat (302) du substrat courbe (300) sur l'enveloppe de tambour avec un premier dispositif d'immobilisation,
    - actionner un organe de commutation (224) afin de faire tourner un excentrique (260) au niveau d'un arbre excentrique (220) orienté parallèlement à l'axe longitudinal de tambour (204) jusqu'à un point mort, dans lequel un insert à vide (240) d'un dispositif d'immobilisation par dépression (210) est précontraint à l'encontre de la force d'un ressort (226), dans lequel l'insert à vide (240) est déplacé le long de la surface d'enveloppe (206) de manière concentrique par rapport à l'axe longitudinal de tambour (204) dans une direction correspondant au sens de rotation de l'enveloppe de tambour, et dans lequel la précontrainte est maintenue en raison du point mort atteint par l'excentrique (260),
    - aspirer une seconde zone de substrat (304) du substrat courbe (300) au moyen d'une dépression exercée par l'insert à vide (240), et
    - actionner l'organe de commutation (224) afin de faire tourner l'excentrique (260) avec l'arbre excentrique (220) à partir du point mort, ce qui fait que l'insert à vide (240) coulisse dans une direction opposée à la direction de rotation de l'enveloppe de tambour grâce à la force de rappel du ressort (226) et le substrat courbe (300) est tendu sur la surface d'enveloppe (206).
EP21167540.0A 2020-04-14 2021-04-09 Tambour pour un dispositif imprimeur, dispositif imprimeur et procédé de fixation temporaire d'un substrat en forme de papier sur un tambour Active EP3895896B1 (fr)

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DE102020110185.6A DE102020110185A1 (de) 2020-04-14 2020-04-14 Trommel für eine druckvorrichtung, druckvorrichtung und verfahren zum zeitweisen fixieren eines bogenförmigen substrats an einer trommel

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Publication number Priority date Publication date Assignee Title
US4660825A (en) 1979-07-26 1987-04-28 Ricoh Company Ltd. Sheet clamping device
DE10315193A1 (de) 2002-04-18 2003-10-30 Heidelberger Druckmasch Ag Gegendruckzylinder in einer Wendeeinrichtung einer bogenverarbeitenden Maschine
JP2009046295A (ja) 2007-08-23 2009-03-05 Brother Ind Ltd 画像記録装置
JP5148363B2 (ja) 2008-05-13 2013-02-20 富士フイルム株式会社 画像形成装置及びメンテナンス方法
JP5350933B2 (ja) 2009-07-31 2013-11-27 富士フイルム株式会社 媒体固定装置及び画像形成装置
EP2657035B1 (fr) 2012-04-24 2016-09-07 Komori Corporation Appareil d'impression numérique
WO2014208587A1 (fr) 2013-06-28 2014-12-31 コニカミノルタ株式会社 Dispositif de formation d'image
DE102016207398B3 (de) 2015-09-09 2016-08-18 Koenig & Bauer Ag Maschinenanordnung zum sequentiellen Bearbeiten mehrerer bogenförmiger jeweils eine Vorderseite und eine Rückseite aufweisender Substrate
JP6599571B2 (ja) * 2016-08-10 2019-10-30 ケーニッヒ ウント バウアー アー・ゲー シート状の基材を連続的に加工する印刷装置を備える機械構造物
DE102016221192A1 (de) 2016-10-27 2018-05-03 Bundesdruckerei Gmbh Vorrichtung und Verfahren zum Bedrucken eines bogenförmigen Substrats

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