EP0602087B1 - Systeme electrophotographique d'impression simultanee double face - Google Patents

Systeme electrophotographique d'impression simultanee double face Download PDF

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Publication number
EP0602087B1
EP0602087B1 EP92918212A EP92918212A EP0602087B1 EP 0602087 B1 EP0602087 B1 EP 0602087B1 EP 92918212 A EP92918212 A EP 92918212A EP 92918212 A EP92918212 A EP 92918212A EP 0602087 B1 EP0602087 B1 EP 0602087B1
Authority
EP
European Patent Office
Prior art keywords
transfer
printing
deflection
recto
recording medium
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.)
Expired - Lifetime
Application number
EP92918212A
Other languages
German (de)
English (en)
Other versions
EP0602087A1 (fr
Inventor
Rudolf WÄCHTLER
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Wincor Nixdorf International 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.)
Filing date
Publication date
Application filed by Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Publication of EP0602087A1 publication Critical patent/EP0602087A1/fr
Application granted granted Critical
Publication of EP0602087B1 publication Critical patent/EP0602087B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/232—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00451—Paper
    • G03G2215/00455—Continuous web, i.e. roll

Definitions

  • the invention relates to a printing or copying machine with two transfer ribbons for simultaneous printing on the front and back of a record carrier.
  • the front and back are fixed simultaneously.
  • the single sheet printed on one side must be turned over and printed again on the other side, and then it becomes contactless with the roller fixing station, e.g. B. promoted via an air cushion.
  • the roller fixing station e.g. B. promoted via an air cushion.
  • non-mechanical printing or copying device for multi-color and reverse side printing which consists of several devices arranged one behind the other, which are operated simultaneously, a switchable deflection device for the paper web is arranged between the devices.
  • the copier contains a photoconductor drum on which front and back toner images are produced in succession.
  • Two transfer belts that can be swiveled alternately onto the photoconductor drum and each wrap around a heating roller take over the front and back toner images.
  • the transfer belts are pivoted away from the photoconductor drum and the toner images are simultaneously transferred to a single sheet passed between the heating rollers.
  • the object of the invention is to provide a printing or copying device with which continuous two-sided printing of the record carrier is possible in one operation.
  • an intermediate carrier e.g. B. a photoconductor drum on the side by side of the front and the back of the recording medium associated toner images are applied, and by the arrangement of two transfer ribbons with appropriate deflection, the recording medium can be printed on the front and back at the same time.
  • the device is suitable for processing single sheets as well as continuous paper. Since only one printing system is required, the device is particularly economical and reliable. It can be operated at high speed.
  • the recording medium passes through the heat-setting station only once. This means that the recording medium is only slightly thermally stressed and not deformed.
  • the entire device is compact and space-saving. The small printing distance when the toner image is generated between the front and back results in a smaller memory requirement for image generation. Mechanical intermediate storage via an extension of the transfer belt is thus also possible.
  • An electrophotographic printing device shown schematically in FIG. 1 contains a photoconductor drum as the intermediate carrier 10. Instead of the photoconductor drum, however, a band-shaped intermediate carrier, e.g. use an OPC tape.
  • the various units for the electrophotographic process are grouped around the intermediate carrier 10. These are essentially: a charging device 11 in the form of a charging corotron for charging the intermediate carrier 10; a character generator 12 with an LED comb for character-dependent exposure of the intermediate carrier 10; a developer station 13 for coloring the charge-dependent discharge image on the intermediate carrier 10 with the aid of toner.
  • a cleaning station 14 is provided, with a cleaning brush integrated therein with an associated suction device and a discharge device.
  • the intermediate carrier 10 (photoconductor drum) is driven by an electric motor and moved in the direction of the arrow in the printing operation.
  • the printing device contains two transfer belts T1 and T2 arranged next to one another, which serve to transfer toner images generated on the photoconductor 10 to a recording medium 15.
  • the transfer ribbons T1 and T2 can be made of a temperature-resistant carrier fabric, e.g. B. of glass fibers or similar materials with elastic arranged thereon Cover layer consist of an elastomer. They are guided so that the elastic cover layer faces the intermediate carrier 10.
  • Both transfer belts T1 and T2 are driven by an electric motor and are designed to be pivotable on and off the photoconductor drum 10. In the exemplary embodiment shown, they are swiveled in and out together, but it is also possible to design them to be swiveled in and out separately. In order to accomplish this pivoting in and out, both transfer belts T1 and T2 are guided over two pivotably arranged guide rollers 16.
  • the transfer of the toner images generated on the intermediate carrier 10 to the belt-shaped transfer elements T1 and T2 takes place in the exemplary embodiment shown by electrostatic transfer. However, it is also possible to generate this transmission purely mechanically by pressing and passing it on.
  • the belt surface is electrostatically charged directly in front of the transfer region on the photoconductor drum 10 by means of a charging station 17, which can consist, for example, of a corotron. Because of the essentially electrostatic transfer effect, only very small forces and contact zones between the photoconductor 10 (intermediate carrier) and the transfer ribbons T1 and T2 are necessary. This avoids excessive heating of the photoconductor.
  • the toner images thus transferred to the transfer belts T1 and T2 are heated, for example with the aid of an infrared heating device 18, until the toner images are sticky. Then they are transferred to the recording medium 15 in a transfer printing and fixing station 19.
  • the transfer printing and fixing station 19 serves both as a transfer printing station and as a fixing station. For this purpose, it contains two rollers, namely an upper roller 20 and a lower roller 21.
  • the transfer tape T1 used for printing on the front side of the recording medium 15 is guided over the lower roller 21, and the transfer tape T2 used for printing on the rear side of the recording medium 15 over the upper roller 20.
  • the rollers 20 and 21 are elastically supported and each have a heater, e.g. B. in the form of a radiator. With sufficient dimensions, it is also possible to heat only one roller.
  • the transfer tapes T1 and T2 are guided over cleaning rollers 22.
  • the record carrier 15 can consist of a single sheet or continuous paper. Furthermore, it should be noted that the terms front and back serve only as relative names for the two sides of the recording medium 15, they are interchangeable.
  • the transfer belts T1 and T2 are arranged side by side.
  • the transfer belt T1 is assigned to the front side (in this case the underside) of the recording medium 15 and the transfer band T2 is assigned to the rear side (in this case the top side) of the recording medium 15. So that this simultaneous printing of the recording medium 15 can take place in the transfer printing and fixing station 19, the transfer ribbon T2 assigned to the rear side is guided over a deflection device 24.
  • the deflection device 24 consists of a feed deflection device 24/1 and a return deflection device 24/2.
  • Both deflection devices 24/1 and 24/2 have two deflection elements 25 and 26 arranged at an angle to one another, the transfer belt T2 being guided over the deflection elements in such a way that only the non-concrete side of the transfer belt touches the deflection elements.
  • the deflection elements 25 and 26 can e.g. B. consist of rods or of movably mounted rollers. Their radius should be such that the toner adhering to the transfer belt T2 is not blasted off by a deflection angle that is too sharp.
  • the deflection elements 24/1 and 24/2 are designed with respect to the position of their deflection elements 25 and 26 so that the transfer belt T2, which wraps around the upper roller 20, is positioned exactly above the transfer belt T1 wrapping around the lower roller 21.
  • both transfer ribbons T1 and T2 move in the same direction (arrow direction) in the area of the transfer printing and fixing station 19, so that they can simultaneously print on the front and the back of the recording medium 15.
  • the record carrier 15 is guided through the transfer printing and fixing station in the direction of the arrow.
  • the printer controller consists schematically of a central processing unit CPU, a page memory SP, which, for. B. is divided into a memory area for front sides VS and a memory area for rear sides RS and a data control unit DC. All of the control units are connected to one another and to the character generator 12 via a BUS system.
  • the generation of the front and back toner images on the photoconductor drum 10 and thus on the transfer belts T1 and T2 is carried out by appropriate data preparation via the data control device DC, the data starting from a data source (HOST) z. B. an external data memory via an interface of the data control device DC.
  • the data of the individual pages to be printed are stored in the page memory SP, for example separated from the front VS and rear RS in corresponding storage areas. If a sequence of recording media 15 is now to be printed, it is necessary due to the different running times of the toner images arranged on the transfer belts T1 and T2 to reach the transfer and fixing station 19, the toner images for the back and the front are staggered in time on the intermediate carrier 10 to generate.
  • the length of the transfer belt for printing on the front side is dimensioned such that a complete toner image of one page can be produced on the transfer belt T1 before the toner image reaches the transfer printing and fixing station 19 and one continues to assume that that the length of the transfer belt T2 between the transfer and fixing station 19 and the intermediate carrier 10 is dimensioned such that it can take two toner images before the first toner image reaches the transfer and fixing station 19, it is necessary to first use the intermediate carrier 10 on the Transfer tape for the rear side T2, to generate the rear side toner image for the first record carrier in the sequence of two supplied record carriers 15.
  • This toner image synchronization can also be achieved according to an embodiment of Figure 2, that the transfer belt T1 is deflected accordingly via a deflection roller 27 and thereby the conveyor length of the transfer belt for the front T1 between the intermediate carrier 10 and transfer and fixing station 19 of the conveyor length of the transfer belt for the Adapts backside T2 between intermediate carrier 10 and transfer and fixing station 19.
  • a simultaneous generation of the toner images for the front and back of an assigned recording medium on the photoconductor drum 10 is possible.
  • a time-delayed preparation of the data for the individual toner images to be generated via the control of the device is not required in this case.
  • a combined transfer printing and fixing station 19 is used.
  • the rollers 20 and 21 would serve as unheated rotatable rollers only for transfer printing of the toner images on the recording medium.
  • An additional fixing station arranged downstream in the paper transport direction (arrow) would then be necessary for fixing the re-printed toner images on the recording medium.
  • This fuser could also be designed as a thermal pressure fuser or z. B. from a Blitzfixierstation or a heat-setting station.
  • deflection elements in the form of spring-mounted, smoothly polished half-shells or similar elements instead of the rotatable rollers 20 and 21.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Fixing For Electrophotography (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)

Abstract

L'invention concerne un dispositif d'impression ou de copie comportant un tambour photoconducteur (10) pour enregistrer deux images de toner adjacentes pour un verso et un recto d'un support d'enregistrement (15). Deux rubans de transfert distincts sont prévus pour l'image de toner recto et l'image de toner verso en vue du transfert simultané des images de toner au support d'enregistrement (15). Un ruban de transfert est infléchi par l'intermédiaire d'un dispositif de déflexion de telle manière que les rubans de transfert (T1 et T2) soient positionnés l'un au-dessus de l'autre dans une station de fixage (19) se présentant sous la forme d'une station de fixage de thermoimpression. Le support d'enregistrement (15) est guidé entre les rubans de transfert (T1 et T2) et ainsi imprimé simultanément recto verso.

Claims (7)

  1. Appareil imprimeur ou copieur comprenant
    - un support intermédiaire (10) auquel est associée une station d'enregistrements et de développement (12, 13) pour recevoir une image toner recto associée à un côté recto d'un support d'enregistrements (15) dans une zone réservée au recto et pour recevoir une image toner verso associée à un côté verso du support d'enregistrements (15) dans une zone réservée au verso, les zones sur le support intermédiaire (10) étant situées les unes à côté des autres perpendiculairement à la direction du mouvement du support intermédiaire (10),
    - un dispositif de réimpression (19) comprenant un élément de renvoi supérieur (20) et un élément de renvoi inférieur (21),
    - une bande de transfert pour le recto (T1) couplée à la zone réservée au recto du support intermédiaire (15), entourant l'élément de renvoi inférieur (21),
    - une bande de transfert pour le verso (T2) couplée à la zone réservée au verso du support intermédiaire (10), entourant l'élément de renvoi supérieur (20), la bande de transfert verso (T2) passant sur un dispositif de renvoi (24) qui déplace la bande de transfert verso (T2) dans le plan de la bande, transversalement à la direction du mouvement de la bande de transfert verso (T2), de manière à ce que les bandes de transfert (T1, T2) soient situées l'une en face de l'autre dans le dispositif de réimpression (19) et impriment simultanément le support d'enregistrements (15) inséré entre les bandes de transfert (T1, T2) dans le dispositif de réimpression (19), et comprenant
    - des moyens (19) pour fixer les images toner transférées sur le support d'enregistrements (15).
  2. Appareil imprimeur ou copieur selon la revendication 1, comprenant des éléments de renvoi (20, 21) qui sont exécutés en tant que cylindres.
  3. Appareil imprimeur ou copieur selon la revendication 1, comprenant un dispositif de réimpression et de fixage (19) qui est pourvu, en tant qu'éléments de renvoi, de cylindres (20, 21) dont au moins un est chauffé.
  4. Appareil imprimeur ou copieur selon l'une des revendications 1 ou 2, comprenant une station de fixage située après la station de réimpression (19) dans la direction de transport du support d'enregistrements (15) et pourvue de deux cylindres de fixage attaquant les deux côtés du support d'enregistrements et dont au moins un est chauffé.
  5. Appareil imprimeur ou copieur selon l'une des revendications 1 à 4, comprenant un dispositif de déviation (27) pour la bande de transfert (T1), associé à la bande de transfert pour le recto (T1), en vue d'adapter la longueur de transport de la bande de transfert (T1) et en tant que stockage intermédiaire mécanique pour les images toner.
  6. Appareil imprimeur ou copieur selon l'une des revendications 1 à 5, comprenant des bandes de transfert (T1, T2) exécutées de manière à pouvoir être rapprochées ou éloignées du support intermédiaire (10).
  7. Appareil imprimeur ou copieur selon l'une des revendications 1 à 6, comprenant un dispositif de renvoi (24) pour la bande de transfert correspondant au verso (T2), le dispositif de renvoi (24) comprenant : un dispositif de renvoi d'arrivée (24/1) et un dispositif de renvoi de retour (24/2) pourvus respectivement d'éléments de renvoi (25, 26) disposés de manière à former un angle l'un par rapport à l'autre, qui guident la bande de transfert (T2) sur sa face ne portant pas de toner.
EP92918212A 1991-09-03 1992-08-27 Systeme electrophotographique d'impression simultanee double face Expired - Lifetime EP0602087B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4129277A DE4129277A1 (de) 1991-09-03 1991-09-03 Elektrofotografisches simultan-doppeldrucksystem
DE4129277 1991-09-03
PCT/DE1992/000716 WO1993005447A1 (fr) 1991-09-03 1992-08-27 Systeme electrophotographique d'impression simultanee double face

Publications (2)

Publication Number Publication Date
EP0602087A1 EP0602087A1 (fr) 1994-06-22
EP0602087B1 true EP0602087B1 (fr) 1996-03-06

Family

ID=6439767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92918212A Expired - Lifetime EP0602087B1 (fr) 1991-09-03 1992-08-27 Systeme electrophotographique d'impression simultanee double face

Country Status (5)

Country Link
US (1) US5410384A (fr)
EP (1) EP0602087B1 (fr)
JP (1) JPH06510134A (fr)
DE (2) DE4129277A1 (fr)
WO (1) WO1993005447A1 (fr)

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FR2713989B1 (fr) * 1993-12-21 1996-01-12 Nipson Imprimante à haute cadence d'impression et utilisations d'une telle imprimante.
US5526107A (en) * 1994-07-13 1996-06-11 Scitex Corporation Ltd. Color printing apparatus for producing duplex copies
DE59506363D1 (de) * 1994-07-15 1999-08-12 Oce Printing Systems Gmbh Multifunktionale druckeinrichtung zum bedrucken von bandförmigen aufzeichnungsträgern
EP0697634B1 (fr) * 1994-08-19 1996-04-17 Siemens Nixdorf Informationssysteme AG Dispositif d'inversion d'un substrat d'enregistrement en forme de bande
US6108513A (en) * 1995-04-03 2000-08-22 Indigo N.V. Double sided imaging
EP0871082B1 (fr) * 1997-04-07 2008-05-07 Punch Graphix International N.V. Imprimante et méthode électrostatographique
IL121564A (en) * 1997-08-18 2001-06-14 Scitex Corp Ltd Double-sided printing press with a single printing roller for each color
JP2000131893A (ja) * 1998-10-27 2000-05-12 Fujitsu Ltd 両面印刷装置
JP3320367B2 (ja) * 1998-12-08 2002-09-03 富士通株式会社 両面印刷装置および同装置の制御方法
US6466761B1 (en) 2000-11-14 2002-10-15 Xerox Corporation Duplex transfer apparatus and processes

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DE3406244A1 (de) * 1984-02-21 1985-08-22 Siemens AG, 1000 Berlin und 8000 München Laserdrucksystem fuer mehrfarben- und rueckseitendruck
JPH0229217B2 (ja) * 1984-11-13 1990-06-28 Konishiroku Photo Ind Zokirokuhoho
FR2589104A1 (fr) * 1985-10-28 1987-04-30 Telephonie Ind Commerciale Imprimante electrostatique indirecte recto-verso
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JPH04321062A (ja) * 1991-04-22 1992-11-11 Hitachi Koki Co Ltd 連続印刷用紙の両面印刷装置

Also Published As

Publication number Publication date
DE59205624D1 (de) 1996-04-11
JPH06510134A (ja) 1994-11-10
WO1993005447A1 (fr) 1993-03-18
US5410384A (en) 1995-04-25
DE4129277A1 (de) 1993-03-04
DE4129277C2 (fr) 1993-06-03
EP0602087A1 (fr) 1994-06-22

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