EP0608264B1 - Imprimante ou photocopieur ayant un dispositif d'impression des deux cotes d'un support d'enregistrement - Google Patents

Imprimante ou photocopieur ayant un dispositif d'impression des deux cotes d'un support d'enregistrement Download PDF

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Publication number
EP0608264B1
EP0608264B1 EP92920147A EP92920147A EP0608264B1 EP 0608264 B1 EP0608264 B1 EP 0608264B1 EP 92920147 A EP92920147 A EP 92920147A EP 92920147 A EP92920147 A EP 92920147A EP 0608264 B1 EP0608264 B1 EP 0608264B1
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EP
European Patent Office
Prior art keywords
transfer
recording medium
transfer printing
fusing
printing
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
EP92920147A
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German (de)
English (en)
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EP0608264A1 (fr
Inventor
Albrecht Gerstner
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.)
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Publication date
Application filed by Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Priority to EP92920147A priority Critical patent/EP0608264B1/fr
Publication of EP0608264A1 publication Critical patent/EP0608264A1/fr
Application granted granted Critical
Publication of EP0608264B1 publication Critical patent/EP0608264B1/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
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
    • G03G2215/0174—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member plural rotations of recording member to produce multicoloured copy
    • 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
    • G03G2215/1695—Simultaneous toner image transfer and fixing at the second or higher order transfer point

Definitions

  • Printing or copying device with an arrangement for printing on both sides of a record carrier
  • the invention relates to an arrangement for printing on the front or the back of a recording medium in a printing or copying device operating according to the transfer printing principle, and to a method for operating such an arrangement.
  • Printing or copying machines for simplex or duplex printing are e.g. Known from US-A-4 477 176 and US-A 4 537 493. These are electrophotographic printing devices with a photoconductor, on which at least two charge images can be arranged one behind the other and which have a transfer printing station with associated single sheet positioning device (turning device), which makes it possible to operate the electrophotographic printing device in two operating modes, namely in one first operating mode in which the colored toner images arranged one behind the other on the charge image carrier are arranged one above the other or next to one another on one side of the single sheet and in a second operating mode in which the sequence of the toner images located on the charge image carrier is arranged on the front and back of the single sheet.
  • the toner images are fixed on the single sheets with the help of a roller fixing station using pressure and high temperatures.
  • 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. transported via an air cushion.
  • each braking, acceleration and turning device in the device exerts forces on the recording medium, which complicates exact positioning of the recording medium and thus difficult guidance of the recording medium in the device. This increases the risk of congestion considerably, which can lead to frequent downtimes.
  • the turning of a recording medium provided with toner images before the fixing requires a considerable amount of guidance in order to prevent blurring of the toner images.
  • the aim of the invention is to provide an arrangement for printing on the front and / or back of a recording medium in a printing or copying machine which works according to the transfer printing principle, as well as a method for operating such an arrangement which enables simultaneous printing and fixing of the recording medium the front and the back in one step.
  • Another object of the invention is to achieve an optimal registration accuracy of the print images on the recording medium with a minimal control effort.
  • the invention enables simultaneous transfer printing with simultaneous fixation in only one operation.
  • the record carrier can move in a completely straight path through the device at a continuous speed. No acceleration or deceleration processes are required to print and fix the record carrier.
  • a turning device can be omitted.
  • the one-time processing process with simultaneous double-sided transfer printing using a low-temperature fixation leads to a gentle processing of the record carrier. This prevents warping and tension in the record carrier.
  • the arrangement enables full color printing without additional effort in the transfer printing and fixing station.
  • the illustrated electrophotographic single-sheet printing device for single-color or multi-color printing of single sheets in simplex or duplex mode contains an intermediate carrier 10 in the form of a photoconductor drum which is driven by an electric motor. Instead of the photoconductor drum, however, an OPC tape can also be arranged. Grouped around the first intermediate carrier 10 are the various units for the electrophotographic process. These are essentially: a charging device LE in the form of a charging corotron for charging the intermediate carrier 10; a character generator ZG with an LED comb for character-dependent exposure of the intermediate carrier 10; Developer stations EY, EM, EC and EB for coloring the charge-dependent discharge images generated with the help of the character generator ZG on the intermediate carrier 10 with colored toner.
  • the developer station EY contains yellow toner, the developer station EM toner in the color magenta, the developer station EC toner the color cyan and the developer station EB black toner.
  • a cleaning station RS is provided with a cleaning brush integrated therein with an associated suction device and a discharge device (not shown here).
  • the developer stations EY, EM, EC and EB are interchangeable designed and z. B. pulled out of the device via slide guides and inserted into the device. They are usually constructed and contain developer rollers for coloring the charge image. They can be controlled individually and can be operated or activated together or individually.
  • the deflection rollers 16 and 17 are part of the transfer station 11, which in the case shown contains a transfer corotron 19.
  • a mechanical transfer station instead of such an electrostatic transfer station, in which the toner images developed on the intermediate carrier 10 are transferred to the transfer belt 12 by contact between the transfer belt 12 and the intermediate carrier 10.
  • a transfer printing and fixing element 22 in is parallel to the deflection roller 13 Form arranged a heated transfer roller. It is guided on both sides and is supported on the deflection roller 13 and thus on the transfer belt 12 via an elastic suspension. It can also be driven by an electric motor.
  • the area between the deflected transfer belt 12 or the deflection roller 13 and the transfer roller 22 is referred to as transfer and fixing gap 23.
  • the transfer roller 22 has a structure as shown, for example, in FIG. 2. It consists of a metal hollow roller 24 made of aluminum with an elastic layer arranged thereon, e.g. B. made of rubber 25 and an outer jacket layer 26 made of fluoroplastic.
  • the fluoroplastic-containing outer jacket can, for. B.
  • Teflon can be used as the fluoroplastic material. Teflon is a trademark of Du Pont. Fluoroplastic materials are e.g. B. materials made of tetrafluoroethylene, photopolymers of tetrafluoroethylene and hexafluoropropylene and similar materials.
  • the hollow roller 24 can have a thickness of 2 to 5 mm, the rubber layer 25 z. B. a thickness of 200 to 500 microns. However, other dimensions are possible, as z. B. are described in EP-B1-0 186 314.
  • a heating device 27 in the form of a radiant heater is arranged in the hollow roller 24. It is also possible to heat the hollow roller 24 from the outside.
  • a cleaning device 28, for. B. in the form of a movable assembly line or in the form of brushes.
  • the cleaning device 28 can be pivoted in and out on the transfer roller 22 with the aid of a pivoting mechanism in the arrow directions shown in FIG. 1.
  • a paper channel 30 For feeding a recording medium 29 in the form of a single sheet or several arranged side by side Single sheets for the transfer printing and fixing gap 23, a paper channel 30 is provided with the recording medium transport devices 31 and 32 assigned to the paper channel, e.g. B. with both sides of the paper channel 30 attacking paper transport rollers 33 or conveyor belts.
  • These record carrier transport devices transport the single sheets 29 from a storage area 34 to the transfer printing and fixing nip 23 and from there to a stacking device 35.
  • This preheating device 36 can be constructed corresponding to the heating station 20 and it can have radiator elements arranged on both sides of the paper transport channel 30. Instead of separate radiators, it is also possible, for. B. to heat the paper transport rollers 33 of the recording medium transport device 31.
  • the record carrier 29 to be printed is fed in the form of a single sheet to the transfer printing and fixing station 18 in such a way that its rear side faces upwards and its front side points downwards.
  • the record carrier 29 is thus stacked face down in the stacking device 35.
  • the terms "front side” and “back side” are to be understood relatively to describe the two opposite surfaces of the record carrier.
  • the present printing or copying machine has a format-independent printing performance to reduce the control effort and to achieve a high register accuracy. That means within a certain unit of time it can be A4 or A5 regardless of the size of the formats or US formats a certain number of single sheets can be printed. The print performance is based on the processing speed of the largest possible format.
  • the single sheets 29 of different formats are thus fed to the transfer printing and fixing station 18 with a fixed time grid in fixed time windows and printed within these fixed time windows regardless of their format size.
  • image areas 38 are defined on the photoconductor, within which charge images 37/1, 37/2 can be generated at any point via the character generator ZG by exposing the photoconductor drum 10.
  • the image areas also determine the largest possible charge image that can be generated, the so-called "IMAGE".
  • the image areas 38 of constant size are continuously lined up, their constant length is referred to as the following distance.
  • the following distance must now be dimensioned such that it is larger than the largest possible recording medium format to be processed.
  • the size of the image areas and thus the subsequent distance is determined in such a way that the common DIN and US formats result in a maximum printing performance and thus the predetermined image areas and thus the largest charge image that can be generated is used to the maximum.
  • the latent character images of the back 37/1 and the front 37/2 of a sequence of individual sheets 29 to be printed are produced in succession in the image areas 38 of the photoconductor 10 by exposure, specifically the back 37/1 followed by the front 37/2 etc.
  • the latent character images "IMAGES" are then colored by one of the developer stations EB to EY depending on the desired color with toner and thus toner images 39/1 and 39/2 are generated.
  • the toner images 39/1 and 39/2 are then electrostatically transferred to the transfer belt 12 in the transfer station 11.
  • the transfer belt 12 is in a hot state. It is kept at this temperature by the heating device 20. In this way, firstly back side information and then front side information is now transferred to the transfer belt 12.
  • the action of the heating device 27 changes the state of the toner images, they become doughy.
  • the transfer belt 12 transports the toner images of the back side 39/1 and the front side 39/2, which follow one after the other into the transfer printing and fixed nip 23.
  • a clock sequence is used with which a single sheet is fed after every second toner image.
  • the guidance of the single sheets in the paper transport channel 30 is straight, the transport speed is continuous. Due to the rigid, geometrically precisely determined sequence, a high register accuracy is achieved. Record carriers are printed gently, since the temperatures are low and the transfer and fixing station 18 only has to be passed once in duplex operation.
  • the corresponding charge images are generated one after the other in the image areas 38, colored in the developer station E according to the desired color, transferred to the transfer belt 12 and, in the illustrated case, to the individual sheets fed one behind the other on the front side thereof transfer. Due to the continuous feeding of the single sheets, there is no unwanted transfer of toner images to the transfer roller 22 assigned to the back.
  • the toner images are normally transferred completely to the single sheets 29 without residues of the toner remaining on the transfer belt 12 or the transfer roller 22. Faults occurring in the electrophotographic process can, however, lead to an accumulation of toner at fault locations, which in some circumstances leads to the fact that toner residues still remain on the transfer roller or transfer belt 12.
  • the transfer belt 12 can be assigned a cleaning device 21 in the form of one or more cleaning rollers 15, 21 and the transfer roller 22 a cleaning device 28 e.g. in the form of a fleece cleaning station that can be swung in and out.
  • the fleece cleaning station 28 is pivoted on and off in a controlled manner by the device control as a function of the toner image sequence.
  • the transfer roller 22 can be cleaned with the fleece cleaning station 28 pivoted in, e.g. then take place when there is no toner image to be printed on the transfer roller 22 or e.g. during the transfer to the single sheet.
  • cleaning cycles can be inserted as part of the printing cycle sequence.
  • a sequence of latent character images associated with partial color images for the rear side and a latent character image for the front side is generated in the image areas 38 via the character generator ZG.
  • These latent character images are then colored via the developer stations EB to EY and the toner images thus generated are transferred to the transfer belt 12.
  • the heated, doughy partial color toner images are then superimposed by the transfer roller 22 and, together with a monochrome toner image for the front side, which is also connected to the transfer belt 12, are transferred simultaneously and in one operation to a single sheet being fed.
  • the supplied single sheets 29 can be printed in color on their rear side.
  • Appropriate activation of the character generator in connection with a targeted activation of the developer stations EB to EY also enables mixed operation with different operating modes.

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  • 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)

Abstract

Une imprimante ou un photocopieur fonctionnant selon le principe hectographique comprend un dispositif d'impression du recto et/ou du verso d'un support d'enregistrement (29). Le dispositif comprend un tambour photoconducteur (10) et une bande thermoadhésive de transfert (12) couplée au tambour photoconducteur. Une station (18) d'impression hectographique et de fixation associée à la bande de transfert (12) contient une fente de fixation (23) d'un côté de laquelle est située la bande de transfert (10) et de l'autre côté de laquelle est situé un élément d'impression hectographique et de fixation (22) constitué par un rouleau chauffé d'impression hectographique. La bande de transfert (10) et l'élément d'impression hectographique et de fixation (22) s'appuient élastiquement l'un sur l'autre. Afin d'imprimer en même temps le recto et le verso d'un support d'enregistrement, une première image en toner (39/1) associée au verso du support d'enregistrement (29) et une deuxième image en toner associée au recto (39/2) du support d'enregistrement (29) sont générées sur le tambour photoconducteur et transférées dans cet ordre à la bande de transfert (12). Les images en toner chauffées jusqu'à l'état pâteux sont amenées à la fente de fixation (23), l'image en toner (39/1) correspondant au verso étant traitée la première par le rouleau chauffé (22) d'impression hectographique et de fixation (22). Le support d'enregistrement (29) est ensuite amené à la fente de fixation (23). En tournant sur la feuille (29), la bande de transfert (12) et le rouleau d'impression (22) assurent en même temps le transfert et la fixation des images en toner sur les deux côtés du support d'enregistrement

Claims (10)

  1. Dispositif pour l'impression monochrome ou polychrome du recto et du verso d'un support d'enregistrement (29) dans un appareil d'impression ou de reprographie fonctionnant selon le principe du report, comportant
    - un dispositif électrophotographique (10,ZG,E) comportant un photoconducteur (10) servant à produire une suite d'images de toner (39/1, 39/2) sur le photoconducteur (10),
    - une bande de transfert (12) comportant des moyens associés de transfert électrostatique (19) pour la prise en charge des images de toner (39/1, 39/2) par le photoconducteur (10) et le transport des images de toner à un poste de report et de fixage (18),
    - un ou plusieurs dispositifs de chauffage (20,27) pour chauffer les images de toner (39/1, 39/2) de manière qu'elles possèdent un état pâteux collant au voisinage de la température de fusion du matériau du toner,
    - une fente de report et de fixage (23), associée au poste de report et de fixage (18), sur un côté de laquelle est disposée la bande de transfert (12) et sur l'autre côté de laquelle est disposé un élément de report et de fixage (22), de telle sorte que la bande de transfert (12) et l'élément de report et de fixage (22) prennent appui élastiquement l'un sur l'autre, l'élément de report et de fixage (22) et la bande de transfert (12) étant agencés au niveau de leurs surfaces recevant les images de toner (39/1, 39/2) de telle sorte que l'élément de report et de fixage (22) détache et prend en charge, lors du contact établi avec la bande de transfert (12), une image de toner chaude située sur la bande de transfert (12) et se trouvant dans un état pâteux et collant, et
    - un dispositif (31,32) de transport du support d'enregistrement pour amener le support d'enregistrement (29) à la fente de report et de fixage (23) de telle sorte que, lors du passage du support d'enregistrement (29) dans la fente (23), l'élément de report et de fixage (22) et la bande de transfert (12) roulent sur le support d'enregistrement (29) et que des images de toner chaudes (39/1, 39/2), qui sont situées à l'état pâteux et collant, sont transférées au support d'enregistrement (29).
  2. Dispositif suivant la revendication 1,
    - comportant un élément de report et de fixage, qui est agencé sous la forme d'un cylindre chauffé (22).
  3. Dispositif suivant la revendication 1,
    - comportant un élément de report et de fixage, qui est agencé sous la forme d'une bande chauffée.
  4. Dispositif suivant l'une des revendications 1 ou 2,
    - dans laquelle l'élément de report et de fixage (22) possède une longueur circonférentielle qui est fixée en fonction d'une distance de succession, prédéterminée de façon fixe, de zones d'image (38), recevant les images de toner, sur le photoconducteur (10).
  5. Dispositif suivant la revendication 1, comportant un dispositif de nettoyage (28) associé à l'élément de report et de fixage (22) et pouvant être activé le cas échéant.
  6. Dispositif suivant l'une des revendications 1 à 5, comportant un dispositif de chauffage (27,20) associé au poste de report et de fixage (18) et/ou à la bande de transfert (12).
  7. Dispositif suivant l'une des revendications 1 à 6, comportant un dispositif de préchauffage (36) qui réalise le préchauffage du support d'enregistrement (29) avant son envoi à la fente de fixage.
  8. Dispositif suivant la revendication 1, dans lequel la couche superficielle de la bande de transfert (12) est en silicone ou en un matériau semblable au silicone, et la couche superficielle de l'élément de report et de fixage (22) contient une matière plastique fluorée.
  9. Procédé pour l'impression monochrone ou polychrone simultanée au recto et au verso d'un support d'enregistrement (29) dans un appareil d'impression ou de reprographie fonctionnant selon le principe du report, présentant les caractéristiques suivantes :
    - production d'une suite d'images de toner (37/1, 37/2) au moyen d'un processus électrophotographique sur un photoconducteur (10), une première image de toner (37/1) étant associée au verso du support d'enregistrement (29) et une seconde image de toner (37/2) étant associée au recto du support d'enregistrement (29),
    - transfert électrostatique de la suite d'images de toner sur une bande de transfert (12),
    - envoi de la suite d'images de toner situées sur la bande de transfert (12) à un poste de report et de fixage (18) comportant une fente de report et de fixage (23) servant à recevoir le support d'enregistrement (29), et sur un côté de laquelle est disposée la bande de transfert (12) et sur l'autre côté de laquelle est disposé un élément de report et de fixage (22),
    - chauffage des images de toner situées sur la bande de transfert (12) et/ou dans la fente de report et de fixage (23) jusqu'au voisinage de la température de fusion du matériau du toner,
    - transfert de la première image de toner (34/1) sur l'élément de report et de fixage (22),
    - envoi d'un support d'enregistrement à la fente de report et de fixage (23), auquel cas, pour l'impression simultanée au recto et au verso sur le support d'enregistrement (29) et pour le fixage des images de toner sur le support d'enregistrement, l'élément de report et de fixage (22) comportant la première image de toner (37/1) et la bande de transfert (12) comportant la seconde image de toner (37/2) roulent sur le support d'enregistrement (29).
  10. Procédé suivant la revendication 9, selon lequel les images de toner situées sur le support intermédiaire (10) sont formées dans des zones d'images (38), qui se succèdent à une distance prédéterminée de façon fixe et que la longueur circonférentielle de l'élément de report et de fixage (22) est fixée en fonction de cette distance de succession.
EP92920147A 1991-10-15 1992-09-24 Imprimante ou photocopieur ayant un dispositif d'impression des deux cotes d'un support d'enregistrement Expired - Lifetime EP0608264B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92920147A EP0608264B1 (fr) 1991-10-15 1992-09-24 Imprimante ou photocopieur ayant un dispositif d'impression des deux cotes d'un support d'enregistrement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP91117565 1991-10-15
EP91117565 1991-10-15
PCT/EP1992/002214 WO1993008511A1 (fr) 1991-10-15 1992-09-24 Imprimante ou photocopieur ayant un dispositif d'impression des deux cotes d'un support d'enregistrement
EP92920147A EP0608264B1 (fr) 1991-10-15 1992-09-24 Imprimante ou photocopieur ayant un dispositif d'impression des deux cotes d'un support d'enregistrement

Publications (2)

Publication Number Publication Date
EP0608264A1 EP0608264A1 (fr) 1994-08-03
EP0608264B1 true EP0608264B1 (fr) 1995-11-15

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EP92920147A Expired - Lifetime EP0608264B1 (fr) 1991-10-15 1992-09-24 Imprimante ou photocopieur ayant un dispositif d'impression des deux cotes d'un support d'enregistrement

Country Status (5)

Country Link
US (1) US5420662A (fr)
EP (1) EP0608264B1 (fr)
JP (1) JPH07500925A (fr)
DE (1) DE59204375D1 (fr)
WO (1) WO1993008511A1 (fr)

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Also Published As

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JPH07500925A (ja) 1995-01-26
DE59204375D1 (de) 1995-12-21
EP0608264A1 (fr) 1994-08-03
US5420662A (en) 1995-05-30
WO1993008511A1 (fr) 1993-04-29

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