EP1488289B1 - Procede et dispositif d'impression de feuilles individuelles au moyen d'un ensemble inverseur - Google Patents

Procede et dispositif d'impression de feuilles individuelles au moyen d'un ensemble inverseur Download PDF

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Publication number
EP1488289B1
EP1488289B1 EP03718702A EP03718702A EP1488289B1 EP 1488289 B1 EP1488289 B1 EP 1488289B1 EP 03718702 A EP03718702 A EP 03718702A EP 03718702 A EP03718702 A EP 03718702A EP 1488289 B1 EP1488289 B1 EP 1488289B1
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EP
European Patent Office
Prior art keywords
printing
individual sheets
switch
toner
printing unit
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
EP03718702A
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German (de)
English (en)
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EP1488289A1 (fr
Inventor
Hans Manzer
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
Oce Printing Systems GmbH and Co KG
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Publication of EP1488289A1 publication Critical patent/EP1488289A1/fr
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Anticipated expiration legal-status Critical
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    • 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
    • G03G15/234—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member by inverting and refeeding the image receiving material with an image on one face to the recording member to transfer a second image on its second face, e.g. by using a duplex tray; Details of duplex trays or inverters

Definitions

  • the invention relates to an electrographic printing device, in particular a printer or copier, in which at least one printing unit is used which contains at least two exposure units, at least two charging corona devices and at least two developer stations which are arranged along the circumference of a toner intermediate carrier. Furthermore, the invention relates to a method for printing.
  • a latent light is applied.
  • toner is accumulated on the latent image.
  • a substrate e.g. a paper web
  • the toner is transferred at the transfer point. The toner image on the substrate will be fixed later.
  • duplex printing Modern printing technology requires that a single device print the substrate on both sides at high speed. This mode is commonly referred to as duplex printing. It also requires Spot Color Printing or Dual Color Printing, which prints two-color on both sides of the substrate. In addition, there is a need for full-color printing with the four process colors "yellow, magenta, cyan and black".
  • duplex printing it is known to first print a continuous carrier web on one side, then to turn the carrier web and to print the second page with the same printing unit.
  • the transport path of the carrier web in the printer and in the required web turning device is relatively long and requires a complicated and also prone to failure transport device for the carrier material.
  • an electrographic printing device which contains two similar printing units whose transfer printing locations are arranged opposite one another.
  • a continuous carrier web is passed between the two printing units and the front side and the back side of the carrier web are printed simultaneously.
  • the printing units may each contain a plurality of exposure units and a plurality of developer stations, so that a multi-color printing can be realized on each side of the continuous carrier web.
  • EP 0 433 444 B1 (Applicant: Eastman Kodak Company) is also known a printer in which a plurality of developer stations are arranged along a photoconductor belt as a toner image carrier. Each developer station can color the charge image generated by an exposure station with toner of a predetermined color. The toner image formed on the photoconductor belt is then transferred to the substrate at a single transfer point.
  • the same applicant is a printing device with two similar printing units known, which are supplied via a common input sheets.
  • the individual sheets are supplied in the printing device via guideways so the two printing units that both the front and the back of the single sheets are printed in a single pass of the single sheets by the printing device.
  • the transport routes for the single sheets are connected via connection paths to two rings.
  • Each ring contains a printing unit.
  • the individual sheets can be fed to the one ring or the other ring and can also pass through the two rings one after the other, optionally turning the single sheets can be done. This document also describes turning devices.
  • a color printer which contains a printing unit with a printing roller.
  • the printing roller prints on a page at a first Umbuchstelle an image page and during further transport prints the same pressure roller at one of the first Umtikstellen opposite second Umtikstelle an image on the other side of the sheet. During transport, the sheet is turned.
  • single sheets are used as the carrier material.
  • high flexibility in the print jobs can be achieved.
  • different print formats and also different carrier materials can be used.
  • the occurring in continuous webs committee, also called waste, is completely avoided.
  • a turning device which turns the single sheets after a first printing operation and re-feeds the printing unit for printing on the other side.
  • This turning device can be arranged relatively close to the printing unit due to the use of single sheets, resulting in a compact structure.
  • the printing unit contains at least one printing unit, which in turn contains at least two exposure units, at least two charging corona devices and at least two developer stations, which are arranged along the circumference of the toner subcarrier. In this way, both a single-color printing and a multi-color printing can be realized on both sides of the single sheets.
  • the toner subcarrier is an endless toner carrier belt along the periphery of which the image forming devices are arranged. Due to the possible arrangement of the toner carrier belt as an elongated loop, a compact structure for the entire printing device can also be realized here.
  • FIG. 1 schematically a printing unit 10 is shown, which can be used as described below in a printing unit.
  • the printing unit 10 has a photoconductor belt 12, whose outer peripheral surface is charged with latent charge images, as is known per se from electrophotography.
  • the photoconductor belt 12 is moved past a transfer printing point 16 in a rotary movement in the direction of the arrow 14 in order to transfer a toner image to a single sheet 18.
  • a transfer roller 20 is arranged opposite a transfer corotron 22, which deposits the toner particles on the photoconductor belt 12 by the action of an electrostatic force field on the surface of the single sheet 18, so that a still bleachable toner image on the cut sheet 18 is formed.
  • the transfer corotron 22, viewed in the transport direction 24 of the single sheet 18, is preceded by a conditioning corotron 26 which places the single sheet 18 in a defined electrostatic initial state.
  • the transfer roller 20 opposite a deflection roller 28 is arranged, which deflects the photoconductor web 12.
  • the photoconductive path 12 is formed as an elongated loop whose longitudinal axis is substantially vertical. This makes it possible to arrange the necessary for the generation of the toner image aggregates along this longitudinal axis on both sides of the photoconductor 12 space-saving.
  • the length of the photoconductor belt 12 is chosen so that sufficient space remains for the units to be described.
  • the photoconductor belt 12 is as in FIG. 1 can be seen guided on several rollers 30.
  • a clamping element 32 with a roller is switchable in two positions. In the shown Position is the photoconductor belt 12 taut. In the other (not shown) position, the mechanical tension of the photoconductor belt 12 is reduced. In this position, the photoconductor belt 12 can be replaced or maintenance work can be carried out.
  • a two-color toner image on the photoconductor belt 12 can be generated.
  • a cleaning corotron 34 and a cleaning station 36 are arranged after the transfer corotron 22. Both units have the function of removing the residual toner remaining after printing at the transfer printing point 16 from the photoconductor belt 12 in order to bring it into a defined initial state for the subsequent exposure and toner pickup.
  • a first charging corotron 38 is provided, which generates a defined state of charge on the surface of the photoconductor belt 12.
  • the charge image is influenced in accordance with the printed image to be printed. Subsequently, the charge image is colored by means of a first developer station 42 with a toner of a first color.
  • the photoconductor belt 12 is guided in the further course of a second charging corotron 44, a second character generator 46 and a second developer station 48.
  • a first latent charge image is formed by the first charging corotron 38 and the first character generator 40
  • a first toner image is formed on the photoconductor belt 12 by the first developer station 42.
  • the second character generator 46 in combination with the second loading corotron 44 on the developed first charge image by overlaying creates a second latent charge image which is colored by the second developer station 48 with a toner of a second color.
  • the first Toner image on the photoconductor belt 12 superimposed on a second toner image.
  • the resulting toner image is bicoloured and is transferred at the transfer point 16 to the surface of the cut sheet 18.
  • a two-color toner image can be printed at a high printing speed at the transfer printing point 16.
  • FIG. 2 shows an embodiment of the printing device according to the invention.
  • the printing device has a printing unit 50, which is a printing unit 10 according to FIG. 1 contains.
  • This printing unit 10 prints in the state shown, the single sheet 18.
  • This single sheet 18 is conveyed along a guideway 54, for example with the aid of controlled roller drives.
  • the "simplex mode" mode in which the individual sheets 18 are printed on one side only with the printing unit 10 in monochrome or multicolored, these individual sheets 18 run in a straight path along the guide path 54.
  • a turning device 52 which turns the single sheets 18 after the first printing on the printing unit 10 and the printing unit 10 for printing on the other side feed again.
  • the turning device 52 includes a switch 55 downstream of the pressure unit 50 and a switch 56 upstream of the pressure unit 50 and a return path 58 along which the cut sheets 18 are conveyed.
  • the downstream switch 55 has three operating states. In the first operating state, the switch 55 leaves an incoming from the printing unit 50 single sheet 18 undistorted, so that this single sheet 18 is conveyed along the guideway 54 straight ahead. In a second operating position, the switch 55 deflects the arriving from the printing unit 50 single sheets 18 in the return path 58 from. This return path 58 conveys the individual sheets to the upstream switch 56. This switch 56 is designed as a turning soft. The printed by the printing unit 50 side is in the promotion along the return path 58 above. The single sheet 18 is first transported by the switch 56 in the direction of the arrow 60 for a predetermined turning distance, ie the switch 56 conveys the guided over the return path 58 single sheet into the guideway 54.
  • the transport direction for the now located in the guideway 54 single sheet 18 vice versa ie the transport direction is now opposite to the transport direction 60.
  • the switch 56 is then switched so that this single sheet 18 is transported straight ahead, so that it can be fed again to the printing unit 50 for printing.
  • the switches 55 and 56 thus act together so that the once printed single sheet 18 can be returned along the return path 58 and along the guide track 54 the same printing unit 50 can be fed again and then led out after renewed printing from the printing device.
  • the switches 55 and 56 can also cooperate in another mode, the "bypass mode" so that the along the guideway 54 incoming single sheets 18 are conveyed via the switch 56 to the return path 58 and directed by the switch 55 in the guide track 54. In this mode of operation, therefore, the single sheets 18 are conveyed with the omission of the printing unit 50 in the printing device, e.g. to transport unprinted interleaves through the printing device.
  • FIG. 3 shows another variant.
  • the printing unit 50 here contains two similar printing units 10, which are arranged in series one after the other.
  • Each printing unit 10 prints two-color Toner images.
  • a four-color duplex operation can be realized, ie in each case the front and the back of the single sheets can be printed with four different-colored image patterns.
  • a full-color printing with the four process colors, "yellow, magenta, cyan and black" possible, each of the two printing units 10 of which prints two process colors.
  • the printing unit 50 is followed by a fixing station 62, which realizes a fixing of the printed by the printing unit 50 multicolor toner image.
  • a fixation with the aid of rollers 64, 66 can take place under pressure and heating temperature.
  • an infrared radiation fixation or a combination of radiation fixation and roller fixation can take place.
  • the single sheets are turned in the turning device 52 and fed again to the printing unit 50 to print the back of the single sheets in multi-color printing.
  • a fuser 62 which is arranged between the printing unit 50 and the downstream switch 55, is also in the example after FIG. 2 required.
  • the printing unit 10 may also operate by a method other than the described electrostatic imaging method, e.g. after a magnetic process.
  • a toner subcarrier can be used in addition to a photoconductor belt 12 and a photoconductor drum.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Facsimiles In General (AREA)

Claims (21)

  1. Dispositif d'impression électrographique, notamment appareil d'impression ou copieur, dans lequel
    des feuilles individuelles (18) d'un support d'impression sont transportées le long d'un chemin de guidage (54),
    une unité d'impression (50), en regard du chemin de guidage (54), imprime le côté de la feuille individuelle respective (18) qui lui fait face, une station de fixation (62), disposée immédiatement en aval de l'unité d'impression (50), fixant l'image formée par du toner qui a été imprimée,
    un dispositif de retournement (52) est prévu, qui retourne, après un premier processus d'impression, les feuilles individuelles (18) dotées de l'image formée par du toner qui a été fixée, et les ramène à l'unité d'impression (50) pour imprimer l'autre côté,
    l'unité d'impression (50) contient deux éléments d'impression (10) qui contiennent chacun deux unités d'éclairement (40, 46), deux dispositifs de charge à effet Corona (38, 44) et deux stations de développement (42, 48), qui sont disposés le long de la périphérie de chaque support intermédiaire de toner séparé (12), les feuilles individuelles (18) étant amenées immédiatement l'une après l'autre aux deux éléments d'impression (10), et qui impriment chacun deux images d'impression de couleurs différentes l'une après l'autre sur le même côté de la même feuille individuelle (18),
    une première image latente, qui est colorée avec du toner d'une première couleur par la première station de développement (42), est générée à l'aide du premier dispositif de charge à effet Corona (38) et de la première unité d'éclairement (40) dans chacun des deux éléments d'impression (10) lorsque le support intermédiaire (12) fait un tour complet,
    puis le deuxième dispositif de charge à effet Corona (44) et la deuxième unité d'éclairement (46) génèrent une seconde image latente qui est superposée à la première image latente colorée,
    et la seconde image latente est colorée avec un toner d'une seconde couleur par la deuxième station de développement (48).
  2. Dispositif d'impression selon la revendication 1, dans lequel les stations de développement (42, 48) possèdent des toners de couleurs différentes.
  3. Dispositif d'impression selon la revendication 1 ou 2, dans lequel le support intermédiaire de toner est une bande de support de toner (12), avantageusement une bande photoconductrice (12).
  4. Dispositif d'impression selon l'une des revendications précédentes, dans lequel les éléments d'impression (10) sont de même type, mais utilisent des toners de couleurs différentes.
  5. Dispositif d'impression selon la revendication 4, dans lequel chaque élément d'impression (10) utilise deux toners dont les couleurs sont choisies parmi les couleurs de processus jaune, magenta, cyan et noire, pour l'impression en couleurs pures.
  6. Dispositif d'impression selon l'une des revendications précédentes, dans lequel le dispositif de retournement (52) contient un dispositif d'aiguillage (55) agencé en aval de l'unité d'impression (50), un chemin de retour (58), et un dispositif d'aiguillage (56) agencé en amont de l'unité d'impression (50).
  7. Dispositif d'impression selon la revendication 6, dans lequel le dispositif d'aiguillage aval (55) laisse passer les feuilles individuelles (18) sans les dévier lorsqu'il est dans une première position de fonctionnement.
  8. Dispositif d'impression selon l'une des revendications 6 ou 7, dans lequel le dispositif d'aiguillage aval (55) dévie les feuilles individuelles (18), arrivant de l'unité d'impression (50), vers le chemin de retour (58) lorsqu'il est dans une seconde position de fonctionnement.
  9. Dispositif de fonctionnement selon l'une des revendications 6 à 8, dans lequel le dispositif d'aiguillage aval (55) transporte les feuilles individuelles (18), arrivant du chemin de retour (58), vers le chemin de guidage (54).
  10. Dispositif d'impression selon l'une des revendications 6 à 9, dans lequel le dispositif d'aiguillage amont (56) transporte, lorsqu'il est dans la position de fonctionnement en retournement, une feuille individuelle (18), arrivant du chemin de retour (58), vers le chemin de guidage (54) en passant par une voie de retournement prédéterminée dans le sens opposé au sens de transport normal (24) des feuilles individuelles (18), et dans lequel le dispositif d'aiguillage amont (56) transporte ensuite la feuille individuelle (18) le long du chemin de guidage (54) en direction de l'unité d'impression (50).
  11. Dispositif d'impression selon l'une des revendications 6 à 10, dans lequel le dispositif d'aiguillage amont (56) dévie des feuilles individuelles (18) qui arrivent vers le chemin de retour (58) qui amène les feuilles individuelles (18) au dispositif d'aiguillage aval (55).
  12. Procédé d'impression, dans lequel
    des feuilles individuelles (18) d'un support d'impression sont transportées le long d'un chemin de guidage (54),
    une unité d'impression (50), en regard du chemin de guidage (54), imprime le côté de la feuille individuelle respective (18) qui lui fait face, une station de fixation (62, disposée immédiatement en aval de l'unité d'impression (50), fixant l'image formée par du toner qui a été imprimée,
    un dispositif de retournement (52) est prévu, qui retourne, après un premier processus d'impression, les feuilles individuelles (18) dotées de l'image formée par du toner qui a été fixée, et les ramène à l'unité d'impression (50) pour imprimer l'autre côté,
    l'unité d'impression (50) contient deux éléments d'impression (10) qui contiennent chacun deux unités d'éclairement (40, 46), deux dispositifs de charge à effet Corona (38, 44) et deux stations de développement (42, 48), qui sont disposés le long de la périphérie de chaque support intermédiaire de toner séparé (12), les feuilles individuelles (18) étant amenées immédiatement l'une après l'autre aux deux éléments d'impression (10), et qui impriment chacun deux images d'impression de couleurs différentes l'une après l'autre sur le même côté de la même feuille individuelle (18),
    une première image latente, qui est colorée avec du toner d'une première couleur par la première station de développement (42), est générée à l'aide du premier dispositif de charge à effet Corona (38) et de la première unité d'éclairement (40) dans chacun des deux éléments d'impression (10) lorsque le support intermédiaire (12) fait un tour complet,
    puis le deuxième dispositif de charge à effet Corona (44) et la deuxième unité d'éclairement (46) génèrent une seconde image latente qui est superposée à la première image latente colorée,
    et la seconde image latente est colorée avec un toner d'une seconde couleur par la deuxième station de développement (48).
  13. Procédé d'impression selon la revendication 12, dans lequel le support intermédiaire de toner est une bande de support de toner sans fin (12), avantageusement une bande photoconductrice (12).
  14. Procédé d'impression selon la revendication 12 ou 13, dans lequel les éléments d'impression (10) sont de même type, mais utilisent des toners de couleurs différentes.
  15. Procédé d'impression selon la revendication 14, dans lequel chaque élément d'impression utilise deux toners dont les couleurs sont choisies parmi les couleurs de processus jaune, magenta, cyan et noire, pour l'impression en couleurs pures.
  16. Procédé d'impression selon l'une des revendications précédentes, dans lequel le dispositif de retournement (52) contient un dispositif d'aiguillage (55) agencé en aval de l'unité d'impression (50), un chemin de retour (58), et un dispositif d'aiguillage (56) agencé en amont de l'unité d'impression (50).
  17. Procédé d'impression selon la revendication 16, dans lequel le dispositif d'aiguillage aval (55) laisse passer les feuilles individuelles (18) sans les dévier lorsqu'il est dans une première position de fonctionnement.
  18. Procédé d'impression selon l'une des revendications 16 ou 17, dans lequel le dispositif d'aiguillage aval (55) dévie les feuilles individuelles (18), arrivant de l'unité d'impression (50), vers le chemin de retour (58) lorsqu'il est dans une seconde position de fonctionnement.
  19. Procédé de fonctionnement selon l'une des revendications 16 à 18, dans lequel le dispositif d'aiguillage aval (55) transporte les feuilles individuelles (18), arrivant du chemin de retour (58), vers le chemin de guidage (54).
  20. Procédé d'impression selon l'une des revendications 16 à 19, dans lequel le dispositif d'aiguillage amont (56) transporte, lorsqu'il est dans la position de fonctionnement en retournement, une feuille individuelle (18), arrivant du chemin de retour (58), vers le chemin de guidage (54) en passant par une voie de retournement prédéterminée dans le sens opposé au sens de transport normal (24) des feuilles individuelles (18), et dans lequel le dispositif d'aiguillage amont (56) transporte ensuite la feuille individuelle (18) le long du chemin de guidage (54) en direction de l'unité d'impression (50).
  21. Procédé d'impression selon l'une des revendications 16 à 20, dans lequel le dispositif d'aiguillage amont (56) dévie des feuilles individuelles (18) qui arrivent vers le chemin de retour (58) qui amène les feuilles individuelles (18) au dispositif d'aiguillage aval (55).
EP03718702A 2002-03-22 2003-03-21 Procede et dispositif d'impression de feuilles individuelles au moyen d'un ensemble inverseur Expired - Lifetime EP1488289B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10212840 2002-03-22
DE10212840A DE10212840A1 (de) 2002-03-22 2002-03-22 Verfahren und Einrichtung zum Bedrucken von Einzelblättern mit einer Wendevorrichtung
PCT/EP2003/002989 WO2003081343A1 (fr) 2002-03-22 2003-03-21 Procede et dispositif d'impression de feuilles individuelles au moyen d'un ensemble inverseur

Publications (2)

Publication Number Publication Date
EP1488289A1 EP1488289A1 (fr) 2004-12-22
EP1488289B1 true EP1488289B1 (fr) 2010-08-25

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EP03718702A Expired - Lifetime EP1488289B1 (fr) 2002-03-22 2003-03-21 Procede et dispositif d'impression de feuilles individuelles au moyen d'un ensemble inverseur

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Country Link
US (1) US7636534B2 (fr)
EP (1) EP1488289B1 (fr)
JP (1) JP2005527845A (fr)
DE (2) DE10212840A1 (fr)
WO (1) WO2003081343A1 (fr)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE102004005964A1 (de) 2004-02-06 2005-09-08 OCé PRINTING SYSTEMS GMBH Steuerungseinrichtung und Verfahren zum Steuern eines elektrofotografischen Druckers oder Kopierers

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US7636534B2 (en) 2009-12-22
US20050175384A1 (en) 2005-08-11
WO2003081343A1 (fr) 2003-10-02
JP2005527845A (ja) 2005-09-15
EP1488289A1 (fr) 2004-12-22
DE10212840A1 (de) 2003-10-09

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