EP0635146B1 - Dispositif d'impression electrophotographique pour l'impression simultanee sur les deux faces d'un support - Google Patents

Dispositif d'impression electrophotographique pour l'impression simultanee sur les deux faces d'un support Download PDF

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Publication number
EP0635146B1
EP0635146B1 EP93905157A EP93905157A EP0635146B1 EP 0635146 B1 EP0635146 B1 EP 0635146B1 EP 93905157 A EP93905157 A EP 93905157A EP 93905157 A EP93905157 A EP 93905157A EP 0635146 B1 EP0635146 B1 EP 0635146B1
Authority
EP
European Patent Office
Prior art keywords
printing
recording medium
rollers
printing device
electrophotographic
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
EP93905157A
Other languages
German (de)
English (en)
Other versions
EP0635146A1 (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 EP0635146A1 publication Critical patent/EP0635146A1/fr
Application granted granted Critical
Publication of EP0635146B1 publication Critical patent/EP0635146B1/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
    • G03G15/238—Arrangements for copying on both sides of a recording or image-receiving material using more than one reusable electrographic recording member, e.g. single pass duplex copiers
    • 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
    • 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
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/168—Simultaneous toner image transfer and fixing at the first transfer point
    • G03G2215/1685—Simultaneous toner image transfer and fixing at the first transfer point using heat

Definitions

  • the invention relates to an electrophotographic printing device for simultaneous double-sided printing of a record carrier according to the features of claim 1.
  • An electrophotographic printing device with which a recording medium can be printed on both sides is known from WO-91/13386.
  • the electrophotographic printing device described there in particular for printing on single sheets, contains one or more printing modules in which the process means for carrying out the electrophotographic process are summarized in terms of construction.
  • the printing modules are designed as separate structural units for fastening in a housing of the printing device and have fitting elements for precisely fitting the printing modules in the housing.
  • Each printing module contains an intermediate carrier with associated fixing elements in order to transfer a toner image generated on a photoconductor drum to a recording medium and fix it there.
  • the printing device can be expanded by a multiple arrangement of the printing modules from a single-color simplex printer to a multi-color duplex printer.
  • EP-A2-0 399 794 describes an electrophotographic printing device which has two identical printing modules.
  • the printing modules are fastened in such a way that a transport channel for the recording medium opens between them, heating means being provided on transfer printing rollers for simultaneously fixing the toner images generated on the photoconductors.
  • US-A-36 94 073 describes a method for double-sided printing of a record carrier with an electrophotographic printing device, in which a toner image is applied using a first photoconductor drum a front side of the recording medium is transferred and, with the aid of a second photoconductor drum connected downstream, a toner image on the back side.
  • Fixed are the toner images in several stages.
  • a radiator connected downstream of the first photoconductor drum initially partially fixes the toner image so that the recording medium does not heat up too much and so that the toner image transfer on the second photoconductor drum is not impeded.
  • a further partial fixation takes place via a further radiator, which is connected downstream of the second photoconductor drum.
  • the actual overall fixation of the toner images is effected by a subsequent fixing station with reinforced radiators arranged on both sides of the recording medium.
  • This multi-stage fixation is necessary because the toner image consisting of loose toner particles can stand out from the recording medium between the photoconductors.
  • a multiple action of heat on the record carrier in the course of the printing process deforms and stresses the record carrier made of paper, which deteriorates the print quality and the paper handling.
  • the multiple arrangement of radiators with a high power consumption requires the provision of a powerful, large-scale power supply. This affects the flexible use of the printing device.
  • the object of the invention is to provide a simply constructed and interference-prone electrophotographic printing device for simultaneous printing on both sides of a record carrier, which ensures gentle handling of the record carrier with the lowest possible energy consumption.
  • Another object of the invention is to construct the printing device in such a way that it can be constructed from standard parts depending on customer-specific requirements.
  • a transport channel for the recording medium opens between the printing systems and through the arrangement of appropriate guide means with which the recording medium is printed and fixed in the transport channel at the same time a simply constructed and trouble-free printing device. It is preferably suitable for simultaneous double-sided printing of endless record carriers.
  • a clearly defined paper path, between a storage area and a receiving area, through the printer without significant deflections enables gentle and stress-free treatment of the recording medium, which has a positive effect on the print quality. This is particularly advantageous if environmental papers or the like with a very different composition are used as recording media.
  • a pair of rollers is used as the guide means in the transport channel, which has opposing deflecting rollers which are wrapped by the respective intermediate carrier and between which the recording medium is guided in a transfer printing and fixing nip.
  • the electrophotographic printing device shown in FIG. 1 is used for simultaneous printing on both sides of a tape-shaped recording medium, but is also suitable for printing single sheets if the paper path is designed accordingly. It contains two printing modules 10/1 and 10/2, on which the process means for printing on a recording medium are summarized.
  • These process means comprise: an electric motor-driven photoconductor drum 11 with associated exposure device 12 for generating a charge image on the surface of the photoconductor drum; a developer station 13 for inking the charge image with toner; an endless belt-shaped intermediate carrier 14 for transferring a toner image formed by coloring the charge image on the photoconductor drum onto the surface of the recording medium; Fixing agents for the heat-pressure fixing of the toner image on the recording medium described in more detail later, and cleaning means 15 for cleaning the intermediate carrier 14 and the photoconductor 11.
  • the cleaning agents for the photoconductor can consist of a non-woven tape and a brush cleaning station that works with negative pressure.
  • An LED character generator is used as the exposure device 12, which extends over the entire length of the photoconductor drum 12 and which is controlled by a character generator of the device to generate the charge image on the photoconductor drum 11.
  • the intermediate carrier 14 arranged for transferring the toner image to the recording medium 21 consists of a rubber or silicone band, which is mounted on deflection rollers 16 and is referred to as a thermal transfer ribbon and which contacts the surface of the photoconductor drum 11 in the area of a transfer printing location 17.
  • a motor device 18 which can be arranged, if necessary, allows the intermediate carrier 14 to be pivoted on and off against the photoconductor drum 11.
  • the temperature at the transfer location 17 is set so that the toner of the toner image is in one doughy state and is transferred to the intermediate carrier 14 by adhesive force.
  • the transmission can also take place electrostatically via a corresponding corona station.
  • this transfer location 20 contains a pair of rollers comprising a deflection roller 22 with a large diameter and a counter roller 23, between which the recording medium 21 is passed. If appropriate, it may be favorable to preheat the recording medium 21 via a heating station before it enters the transfer printing station 20/1.
  • the fixability can thereby be increased.
  • the intermediate carrier 14 is then cleaned in a cleaning station 24.
  • the cleaning station 24 contains a cleaning roller with an associated pressure roller.
  • the cleaning roller mechanically or chemically removes toner residues from the intermediate carrier 14, which are then wiped off the cleaning roller on a correspondingly designed nonwoven element or in a cleaning bath.
  • a transport and temperature stabilization unit downstream of the cleaning station 24 in the transport direction of the intermediate carrier, which unit sets the intermediate carrier 14 to a constant temperature.
  • the photoconductor drum 11 can contain an electrically heated heating element as an additional heating device for heating the transfer printing point 17.
  • two identically constructed printing modules 10/1 and 10/2 are arranged in the printing device in such a way that a transport channel 25 opens through the printing modules, through which the recording medium 21 passes starting from a supply roll 26, which is only shown schematically here, to a take-up roll 27.
  • Correspondingly arranged deflection rolls 28 serve for feeding and removing the recording medium 21 in the area of the printing modules 10/1 and 10/2.
  • the transfer printing takes place at the transfer printing point 20/1 of the printing module 10/1 with simultaneous fixing of a back toner image on the back of the recording medium 21 and in the immediately downstream transfer printing station 20/2 of the second printing module 10/2 a transfer printing with simultaneous fixing of a front image on the front of the recording medium 21.
  • a central control device which is coupled to both printing modules
  • the transfer printing takes place at the transfer printing point 20/1 of the printing module 10/1 with simultaneous fixing of a back toner image on the back of the recording medium 21 and in the immediately downstream transfer printing station 20/2 of the second printing module 10/2 a transfer printing with simultaneous fixing of a front image on the front of the recording medium 21.
  • one of the Rolls 22 and 23 of the pair of rolls are additionally heated.
  • a particularly simple and paper-friendly construction of the electrophotographic printing device results from an arrangement of the printing modules 10/1 and 10/2 as shown in FIG.
  • the printing modules 10/1 and 10/2 are arranged against one another in such a way that the deflection rollers 22 for the intermediate carriers 14 lie opposite one another and thus form a single transfer printing and fixing gap 29 through which the recording medium 21 is guided.
  • the deflection rollers can be spring-mounted.
  • the non-active intermediate carrier 14 of the printing modules can be pivoted away from the photoconductor drum with the aid of the motor device 18.
  • the deflection rollers 22 can also be designed such that they can be pivoted on and off. It is also possible to arrange paper rolls which can be pivoted in and out in front of and behind the transfer printing and fixing gap 29 and which ensure that the recording medium is pressed against the transfer printing rollers or guide the recording medium 14 securely in the gap.
  • the relative information on the back side toner image, front side toner image or back side and front side of the recording medium are interchangeable relative data regarding the relative position of the toner image on the recording medium.

Landscapes

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

Abstract

Un dispositif d'impression électrophotographique pour l'impression simultanée sur les deux faces d'un support contient deux modules d'impression (10/1 et 10/2) et les moyens de traitement électrophotographique pertinents (11 à 15). Ces modules d'impression (10/1 et 10/2) sont placés l'un à côté de l'autre et fixés de manière à laisser un passage de transport (25) du support (21). Le support (21) est guidé par des organes de guidage (paires de rouleaux) de manière à pouvoir entrer en contact recto et/ou verso avec le support intermédiaire approprié (14) du module d'impression (10/1 et 10/2) concerné. Le rouleau de renvoi pour le support intermédiaire (14), en coopération avec un contre-rouleau (23), ou bien les rouleaux de renvoi (22) disposés du côté opposé pour le support intermédiaire (14), servent de paires de rouleaux.

Claims (7)

  1. Dispositif d'impression électrophotographique pour l'impression recto-verso d'un support d'enregistrement (21), comprenant
    - un premier module d'impression (10/1) équipé de moyens de traitement électrophotographiques (11 à 13, 15) pour la production d'une image de toner de verso associée au verso du support d'enregistrement (21) sur un photoconducteur (11), et d'un support intermédiaire (14) sans fin, en forme de bande, qui prend l'image de toner sur le photoconducteur (11) et sert à transférer et fixer l'image de toner de verso sur le verso du support d'enregistrement (21) ;
    - un deuxième module d'impression (10/2) équipé de moyens de traitement électrophotographiques (11 à 13, 15) pour la production d'une image de toner de recto associée au recto du support d'enregistrement (21) sur un photoconducteur (11), et d'un support intermédiaire (14) sans fin, en forme de bande, qui prend l'image de toner sur le photoconducteur (11) et sert à transférer l'image de toner de recto sur le recto du support d'enregistrement (21) ;
    les modules d'impression (10/1, 10/2) étant fixés face à face dans le dispositif d'impression de manière à laisser ouvert entre les modules d'impression un couloir de transport (25) pour le support d'enregistrement (21), dans lequel le support d'enregistrement (21) est guidé à l'aide de moyens de guidage (22, 23) de telle manière qu'il puisse être mis en contact par son verso et/ou son recto avec le support intermédiaire (14) respectif associé des modules d'impression (10/1, 10/2).
  2. Dispositif d'impression électrophotographique selon la revendication 1, comprenant, comme moyens de guidage, une paire de cylindres (22, 23) qui comprend un cylindre de renvoi (22) embrassé par le support intermédiaire (14) correspondant et un contre-cylindre (23) qui presse le support d'enregistrement (14) contre le cylindre de renvoi (22).
  3. Dispositif d'impression électrophotographique selon la revendication 1, comprenant, comme moyens de guidage, une paire de cylindres qui comprend des cylindres de renvoi (22) disposés face à face dans le couloir de transport (25), embrassés chacun par son support intermédiaire (14), entre lesquels le support d'enregistrement est guidé dans une fente de report et de fixage formée par les cylindres (22).
  4. Dispositif d'impression électrophotographique selon l'une des revendications 2 ou 3, dans lequel au moins un des cylindres (22, 23) de la paire de cylindres est construit de façon à pouvoir être mis en pression et hors pression.
  5. Dispositif d'impression électrophotographique selon l'une des revendications 2 à 4, dans lequel au moins un des cylindres (22, 23) de la paire de cylindres est construit de façon à pouvoir être chauffé.
  6. Dispositif d'impression électrophotographique selon l'une des revendications 1 à 5, comprenant un dispositif à moteur électrique (18) qui peut mettre le support intermédiaire en pression et hors pression par rapport au photoconducteur selon le besoin.
  7. Dispositif d'impression électrophotographique selon l'une des revendications 1 à 6, comprenant une bande de transfert thermique en tant que support intermédiaire (14).
EP93905157A 1992-04-10 1993-03-04 Dispositif d'impression electrophotographique pour l'impression simultanee sur les deux faces d'un support Expired - Lifetime EP0635146B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4212144 1992-04-10
DE4212144 1992-04-10
PCT/DE1993/000195 WO1993021566A1 (fr) 1992-04-10 1993-03-04 Dispositif d'impression electrophotographique pour l'impression simultanee sur les deux faces d'un support

Publications (2)

Publication Number Publication Date
EP0635146A1 EP0635146A1 (fr) 1995-01-25
EP0635146B1 true EP0635146B1 (fr) 1996-08-07

Family

ID=6456589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93905157A Expired - Lifetime EP0635146B1 (fr) 1992-04-10 1993-03-04 Dispositif d'impression electrophotographique pour l'impression simultanee sur les deux faces d'un support

Country Status (5)

Country Link
US (1) US5550624A (fr)
EP (1) EP0635146B1 (fr)
JP (1) JPH07505489A (fr)
DE (1) DE59303381D1 (fr)
WO (1) WO1993021566A1 (fr)

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
IL113235A (en) * 1995-04-03 2006-07-17 Hewlett Packard Indigo Bv Double sided imaging
US6108513A (en) * 1995-04-03 2000-08-22 Indigo N.V. Double sided imaging
US5740510A (en) * 1995-05-09 1998-04-14 Agfa-Gevaert Electrostatographic multicolour printing apparatus for single pass sequential duplex printing on a web-type toner receptor material
US5765081A (en) * 1995-05-09 1998-06-09 Agfa-Gevaert Electrostatographic multi-color printer for duplex printing on a web-type toner receptor material
KR970028908A (ko) * 1995-11-24 1997-06-24 엘 드 샴펠라에레 싱글 패스 다색 정전 사진 프린터
US5797077A (en) * 1996-04-04 1998-08-18 Fuji Xerox Co., Ltd. Double-sided images forming apparatus and method using the same
DE59702908D1 (de) * 1996-10-17 2001-02-15 Oce Printing Systems Gmbh Modularer elektrofotografischer mehrfarben-drucker
US5875383A (en) * 1997-09-30 1999-02-23 Xerox Corporation Dual mode interchangeable modules cut sheet or web printing system with a single xerographic cut sheet print engine
JPH11143333A (ja) * 1997-11-13 1999-05-28 Fuji Xerox Co Ltd 両面画像形成装置
JP3317908B2 (ja) * 1998-11-16 2002-08-26 富士通株式会社 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
US6487388B2 (en) * 2001-01-24 2002-11-26 Xerox Corporation System and method for duplex printing
JP2002240402A (ja) * 2001-02-22 2002-08-28 Sony Corp 画像及び付帯情報の印刷形成装置及び方法

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JPS5616156A (en) * 1979-07-18 1981-02-16 Ricoh Co Ltd Illumination optical unit for copying
JPS5723983A (en) * 1980-07-21 1982-02-08 Konishiroku Photo Ind Co Ltd Picture forming device
US4427285A (en) * 1981-02-27 1984-01-24 Xerox Corporation Direct duplex printing on pre-cut copy sheets
DE3242231A1 (de) * 1981-11-16 1983-05-26 Konishiroku Photo Industry Co., Ltd., Tokyo Bildwiedergabevorrichtung
DE3324996C2 (de) * 1982-07-12 1994-06-23 Canon Kk Vorrichtung zum Wenden von Aufzeichnungsblättern
DE3406244A1 (de) * 1984-02-21 1985-08-22 Siemens AG, 1000 Berlin und 8000 München Laserdrucksystem fuer mehrfarben- und rueckseitendruck
NL8402339A (nl) * 1984-07-25 1986-02-17 Oce Nederland Bv Electrofotografische inrichting.
JPH0229217B2 (ja) * 1984-11-13 1990-06-28 Konishiroku Photo Ind Zokirokuhoho
US4958187A (en) * 1987-02-13 1990-09-18 Canon Kabushiki Kaisha Image forming apparatus for scanning both sides of an original and producing a duplex copy
US5196893A (en) * 1987-12-22 1993-03-23 Minolta Camera Kabushiki Kaisha Image forming method and apparatus having intermediate transfer member which is movable toward and away from a photoconductor
US5057875A (en) * 1989-01-27 1991-10-15 Oki Electric Industry Co., Ltd. Image forming apparatus provided with an image bearing film and a movable transfixing station
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EP0478820B1 (fr) * 1990-10-02 1996-01-03 Siemens Nixdorf Informationssysteme Aktiengesellschaft Imprimante ou copieur pour l'impression simple face et double face en une ou plusieurs couleurs
US5115277A (en) * 1991-05-17 1992-05-19 Hewlett-Packard Company Electrostatically assisted transfer roller and method for directly transferring liquid toner to a print medium

Also Published As

Publication number Publication date
JPH07505489A (ja) 1995-06-15
WO1993021566A1 (fr) 1993-10-28
DE59303381D1 (de) 1996-09-12
US5550624A (en) 1996-08-27
EP0635146A1 (fr) 1995-01-25

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