EP0742496A1 - Elektrostatographischer Vielfarbendruckapparat für sequentielles Duplexdrucken in einem Durchlauf auf einem gewebeartigen Toneraufnahmematerial - Google Patents

Elektrostatographischer Vielfarbendruckapparat für sequentielles Duplexdrucken in einem Durchlauf auf einem gewebeartigen Toneraufnahmematerial Download PDF

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Publication number
EP0742496A1
EP0742496A1 EP96201030A EP96201030A EP0742496A1 EP 0742496 A1 EP0742496 A1 EP 0742496A1 EP 96201030 A EP96201030 A EP 96201030A EP 96201030 A EP96201030 A EP 96201030A EP 0742496 A1 EP0742496 A1 EP 0742496A1
Authority
EP
European Patent Office
Prior art keywords
toner
printing
receiving member
printing apparatus
drum
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.)
Ceased
Application number
EP96201030A
Other languages
English (en)
French (fr)
Inventor
Jan C/O Agfa-Gevaert N.V. Van Den Bogaert
Leo C/O Agfa-Gevaert N.V. Vackier
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.)
Xeikon NV
Original Assignee
Agfa Gevaert NV
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 Agfa Gevaert NV filed Critical Agfa Gevaert NV
Priority to EP96201030A priority Critical patent/EP0742496A1/de
Publication of EP0742496A1 publication Critical patent/EP0742496A1/de
Ceased 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
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members

Definitions

  • the present invention relates to an electrostatographic printing apparatus suited for single pass sequential multi-colour duplex printing on a web-type receptor material.
  • Printing presses are classified into sheet-fed and web-fed printing presses.
  • non-impact printing processes e.g. electrostatographic printing, (ref. e.g. "Principles of Non-Impact Printing” by Jerome L. Johnson (1986) - Palatino Press - Irvine CA, 92715 U.S.A.).
  • Electrostatographic printing includes electrographic printing in which an electrostatic charge is deposited image-wise, e.g. by ionography, on a dielectric recording member as well as electrophotographic printing in which an overall electrostatically charged photoconductive dielectric recording member is image-wise exposed to conductivity increasing radiation producing thereby a "direct” or “reversal” toner-developable charge pattern on the recording member.
  • "Direct” development is a positive-positive development, and is particularly useful for reproducing pictures and text.
  • Reversal development is of interest in or when from a negative original a positive reproduction has to be made or vice-versa, or when the exposure derives from an image in digital electrical signal form, wherein the electrical signals modulate a laser beam or the light output of light-emitting diodes (LEDs). It is advantageous with respect to a reduced load of the electric signal modulated light source (laser or LEDs) to record graphic information (e.g. printed text) in such a way that the light information corresponds with the graphic characters so that by "reversal" development in the exposed area of a photoconductive recording layer, toner can be deposited to produce a positive reproduction of the electronically stored original. In high speed electrostatographic printing the exposure derives practically always from electronically stored, i.e. computer stored information.
  • graphic information e.g. printed text
  • the digitally operated multicolour electrophotographic printing machine XEIKON DCP-1 (tradename) (see also published EP-A 629 924 and 631 204) is capable of simultaneous duplex printing with good image registration by using a printing web driving all the photoconductive printing drums, whereas the E-PRINT 1000 (tradename) (see page 14 of the above mentioned article) operates with paper sheets and requires a turnaround mechanism for printing on both sides of the paper sheets whereby it is impossible to print continuously varying information on a receptor of practically infinite length as is possible with the web-fed XEIKON DCP-1 (tradename). Printing on paper with exceptionally long length is applied in practice e.g. in printing of a continuously varying stream of computer data or in the printing of wall paper wherein the length of the printing pattern largely exceeds the length of the printing drum.
  • single-pass simultaneous duplex printing on a paper web with more than three printing stations in staggered position with respect to the printing web requires according to published EP-A 631 204 means for controlling the electrostatic polarity of the toner already present on the web in advance of the third and each subsequent image-producing stations, to enable the transfer of a toner image at a third and any subsequent image-producing stations without disturbing the image transferred to the same side of the web at a previous image-producing station (see claims 3 and 4 of said EP-A).
  • the introduction of all these coronas for obtaining good printing quality with said electrostatographic duplex printer makes that a considerable amount of ozone and ionized gas are produced that may not enter into the environment and require neutralization or removal, e.g. by absorption.
  • monochrome colour separation images i.e. yellow, magenta, cyan and black image
  • the objects of the present invention are realized by providing an electrostatographic printing apparatus suited for single-pass sequential multi-colour duplex printing, characterized in that said printing proceeds by depositing and fixing toner particles on a final substrate (1) in web form and said apparatus comprises :
  • Fig. 1 represents a schematic cross-sectional view of an embodiment according to the present invention of a single pass duplex (double-side) multicolour electrostatographic printing machine wherein toner images that have been deposited on intermediate toner-receiving drums are transfixed on a final substrate in the form of a paper web.
  • Fig. 2 represents a schematic cross-sectional view of another embodiment according to the present invention of a single pass duplex (double-side) multicolour electrostatographic printing machine wherein toner images formed in a first printing system at one side of a paper web are fixed by an hot roll fuser intermediate said first printing system and a second printing system.
  • Fig. 3 represents a schematic cross-sectional view of still another embodiment according to the present invention of a single pass duplex (double-side) multicolour electrostatographic printing machine operating with a paper web driven by endless belts as intermediate toner-receiving members and wherein the toner images on the web are fixed by infra-red radiation in non-contact with the heating source.
  • the present invention can be implemented in an apparatus comprising two printing systems being arranged in succession at opposite sides of a final substrate in web form, each of the printing systems comprising an intermediate rotatable toner-receiving member.
  • colour separation images i.e. a yellow, magenta, cyan and black image
  • the apparatus comprises two printing systems on opposite sides of the final substrate (in web form), both sides of the final substrate can be printed in a single pass.
  • the intermediate toner-receiving member have preferably an endless surface, in the form of drums or endless belts, and are electrically insulating or have an electrically insulating surface layer, e.g. insulating polymer layer on an electrically biased metal base.
  • a very suitable method for depositing toner particles on said intermediate toner-receiving member is the method of Direct Electrostatic Printing (DEP).
  • DEP Direct Electrostatic Printing
  • a flow of charged toner particles from a toner source to a substrate is caused by a an electric field between the toner source and a backelectrode located behind said substrate.
  • the flow of toner particles is imagewise modulated by a printhead structure, comprising printing apertures, that by applying changing electrical fields can either let toner particles pass or prevent the passing of the toner particles.
  • DEP device wherein toner particles are applied to an intermediate toner receiving member.
  • European Application 95201262 filed on May 15, 1996, that is included herein by reference.
  • Another useful method for depositing toner particles on the intermediate toner-receiving member is a printing device as described in EP-A 304 983.
  • the colour separations are made on an image-forming element in the form of a rotating drum provided with an electrostatic layer built up from a number of controllable electrodes in and beneath a dielectric layer.
  • By imagewise applying a voltage on the controllable electrodes toner particles are attracted from a toner source to the drum. It is possible to mount several of such image forming elements, each adapted for printing a colour separation image, around the intermediate toner-receiving member of the present invention and apply the colour separation images in registration on the intermediate toner-receiving member.
  • the colour separation images are applied in registration to said intermediate toner-receiving member by a plurality of rotatable image-producing electrostatographic members that can be synchronously rotationally driven in contact with a common intermediate toner-receiving member, that is either a drum or an endless belt.
  • the image-producing electrostatographic members in an apparatus according to the present invention are endless surface members in the apparatus according to the present invention and are in the form of drums or endless belts, but are preferably in the form of drums having the same diameter.
  • the electrostatic image can be produced on said image-producing electrostatic members either by ionography (image-wise application of charges) or by electrophotography (imagewise exposure to light of a homogeneously charged photoconductive layer). This latter embodiment is the preferred embodiment to produce images on said electrostatographic image-producing members.
  • drums or belts For use in electrophotographic printing said drums or belts have a photoconductive coating or layer on a conductive support.
  • the intermediate toner-receiving member of the first printing system is a drum and is operated as a drive roller coupled to a speed controllable motor
  • the intermediate toner-receiving member of the second printing system is also a drum and is operated as a drive roller coupled to a torque controllable motor.
  • each of said intermediate toner-receiving members are drums and form a nip with a hot pressure roller, the final substrate by passing trough said nip obtains a translational displacement in synchronism with the peripheral movement of said toner-receiving members.
  • toner images transferred from said toner-receiving members are transfixed in registration onto said final substrate.
  • the present printing apparatus further comprises between the first and second printing system a fusing means for fixing already the toner images transferred on the final substrate in the first printing system.
  • said fusing means comprises a backing roller for said web and a hot reversing (turnaround) roller directly contacting said toner images.
  • a paper web 1 fed from a paper supply roller 2 is passed in the nip formed by an intermediate toner-receiving drum 3 and a backing roller 4 being under pressure towards said toner-receiving drum 3.
  • Said backing roller 4 is a hot fuser roller being electrically biased for attracting the toner particles from the toner-receiving drum 3 onto paper web 1, whereon the toner particles become trans-fixed.
  • the toner-receiving drum 3 has transfer coronas 25 inside opposite each photoconductive drum (5, 6, 7, 8).
  • each photoconductive drum is associated at its periphery with a corona-charging source 9 for uniformly charging the photoconductive layer of the drum.
  • An image-wise modulated light beam of a LED-array exposure source 10 is exposing each photoconductive drum according to the selected colour information, e.g. of a separation image (red, green or blue light information) of a multicolour original to be reproduced.
  • Each photoconductive drum has its associated toner development unit 11, e.g. a magnetic brush developing unit, and cleaning unit 12, e.g. a brush cleaning unit with suction exhaust, for removing residual non-transferred toner particles.
  • Each toner image initially formed on its photoconductive drum is transferred by electrostatic force onto the electrically biased toner-receiving drum 3 having transfer coronas 25 inside opposite each photoconductive drum.
  • the photoconductive drums ((5, 6, 7 and 8) are driven by the intermediate toner-receiving drum 3 of which the pressure contact with the photoconductive drums is such that the rotational movement of said drums is controlled by the peripheral speed of the outer surface of said drum 3, so that there is almost no slippage between it and the photoconductive drums.
  • transfer of the toner image of each photoconductive drum can take place in good superposing registration onto said toner-receiving drum 3.
  • the hot backing roller 4 has optionally a resilient surface so that under deformation thereof by pressing it towards the toner-receiving drum 3 there is a larger heating contact with the rear side of the toner-loaded paper web, the toner-images of which are heated through the paper web.
  • the pressure applied in the nip of said drum 3 and roller 4 makes that the paper is moved in synchronism with the peripheral movement of the toner-receiving drum 3 the axis of which is coupled to a speed controllable motor (not shown in Fig. 1).
  • the toner images that have been superposed on the toner-receiving drum are brought simultaneously into contact with the paper web 1 and trans-fixed thereon.
  • a brush cleaning station 20 with suction exhaust removes non-transferred toner from said intermediate drum 3.
  • the paper web arrives over cooling conveyor rollers 14 and 15 at a second printing system II being functionally the same as the first printing system I.
  • a second printing system II being functionally the same as the first printing system I.
  • the different members of the second system have obtained the same numbering as in the first system.
  • the whole process as described for the first printing system is repeated but at the opposite side of the paper web 1.
  • Said fixing station 16 is followed by a cutting station (not shown in the drawing ) in case prints in sheet form are required.
  • Fig. 2 represents in a schematic cross-sectional view another embodiment of a single pass duplex (double-side) multicolour electrostatographic printing machine which differs from the machine illustrated in Fig. 1 in that the backing roller 4 is not internally heated and does not serve in a trans-fix system but a hot roller 17 with back pressure roller 18 is used for fixing the toner images obtained in the first printing system before arriving in the second printing system.
  • the direct contact of the hot roller 17 with the toner particles makes that less heat is required for their fixing by fusing then when heat is applied through the rear side of the paper web 1 as shown in Fig. 1.
  • an encoder is fixed (not shown in the drawings) (see e.g. US-P 5,119,128) for yielding timing pulses that ensure synchronism of peripheral movement of said drums.
  • a paper web 1 fed from a paper supply roller 2 combined with a web-tensioning brake 15 is conveyed by conveyor roller 30 into the nip formed by a pressure backing roller 31A and part of an intermediate toner-receiving member, being endless belt 32A that is conveyed by a driver roller 33A (connected by its axis to an electric motor - not shown in the drawing) and belt-tensioning conveyor roller 34A.
  • Said pressure backing roller 31A has inside a transfer corona 35A to attract the toner particles from the intermediate toner-receiving member 32A onto the paper web 1.
  • each photoconductive drum represents respectively a cyan, magenta, yellow toner and black image-producing station positioned in contact with one side of said endless belt 32A.
  • Each said photoconductive drum is associated at its periphery with a corona-charging source 9 for uniformly charging the photoconductive layer of the drum.
  • An image-wise modulated light beam of a LED-array exposure source 10 is exposing each photoconductive drum according to the selected colour information, e.g. of a separation image (red, green or blue light information) of a multicolour original to be reproduced.
  • Each photoconductive drum has its associated toner development unit 11 and cleaning unit 12, e.g. brush cleaning unit with suction exhaust, for removing residual non-transferred toner particles.
  • the photoconductive drums ((40, 50, 60 and 70) are driven by their pressure-contact with the intermediate toner-receiving member 32A so that each of them obtains the same peripheral movement in synchronism with the peripheral movement of said belt.
  • the rotational movement of said intermediate toner-receiving member 32A controls also through its pressure-contact with the paper web 1 the synchronous translational movement of said web.
  • each drive roller 33A and 33B of the intermediate toner-receiving members 32A and 32B respectively is connected through its axis to a speed-controllable electric motor (not shown in Fig. 3).
  • Said individual electric motors are operated synchronously using for their speed control an encoder (not shown in Fig. 3) on the rotation axis of said drive rollers (33A and 33B).
  • Timing pulses provided by said encoders ensure synchronism of peripheral speed of both said intermediate toner-receiving members 32A and 32B.
  • a suitable encoder for that purpose is described e.g. in US-P 5,119,128.
  • Each toner image initially formed on its photoconductive drum is transferred by electrostatic force onto the electrically biased intermediate toner-receiving member 32A having transfer coronas 33 inside and opposite each photoconductive drum.
  • the toner polarity of the toner particles of the toner images already deposited on the receptor web 1 in the first printing system I is reversed in order to prevent that toner particles of said first formed images transfer from the paper web 1 onto the backing roller 31B during the electrostatic transfer of the secondly formed toner images that have been deposited in superposition on the intermediate toner-receiving member 32B in the second printing system.
  • the reversing of the charge polarity of already deposited toner proceeds with DC coronas (36, 37), wherein the corona directed to the toner particles has a charge polarity opposite to the original charge polarity of the toner applied in the first printing system.
  • the reversing of toner polarity as described above can be omitted by using in the second printing system toner particles of a charge polarity opposite to the charge polarity of the toner particles used in the first printing system and by applying to the backing roller 31B of the second printing system an electric bias of a polarity opposite to the polarity of the bias applied to the hacking roller 31A in the first printing system.
  • Some fixing or sintering of the toner particles of the images formed in the first printing system before passing the receptor web into the second printing system may also prevent transfer thereof to the guiding member of the second printing system.
  • Such intermediate fixing especially when applying a considerable amount of heat, may give rise to distortion of the paper web, e.g. causes wrinkling of the paper by too strongly drying, so that misregistration of the toner images formed in the second printing system may take place.
  • misregistration of the toner images later on formed at the other side of the receptor web may be kept at a minimum.
  • a brush cleaning station 39A preceded by alternating current corona 38A removes non-transferred toner from intermediate toner-receiving member 32A.
  • Said fixing station 81 is followed by a toner-abhesive turnaround roller 80 forming a nip with a toner-abhesive drive roller 82 driven by electric motor 83 to keep the paper web 1 straight without causing slippage thereof with respect to the intermediate toner receiving member, being endless belts 32 A and 32B in the toner-transfer points.
  • the abhesive character of the surface of said rollers 80 and 82 may be obtained with a surface coating of a highly fluorinated polymer such as poly(tetrafluoroethylene), sold under the tradename TEFLON.
  • the turnaround roller 80 and drive roller 82 may be provided with a cleaning system (not shown in the drawing), e.g. a brush cleaner as indicated by numeral 12 for the photoconductive drums.
  • turnaround roller 80 and drive roller 82 are followed by a cooling zone in which cold air is directed on the heat-fixed toner images or wherein both sides of the paper web make contact with smooth metal rollers that are cooled by cooling liquid pumped through said rollers.
  • the paper web 1 carrying fixed toner images at both sides is fed in a cutting station 84 and collected in a tray 85 or sorter.
  • an array of light-emitting diodes is used as is the case likewise in the printer described in published EP-A 629 924.
  • Exposure by laser light from a gas laser (e.g. He-Ne laser) or from a semiconductor laser (e.g. a GaAs laser) is a useful exposure method in the implementation of the present invention.
  • the imagewise modulation of the laser light is preferably done by pulse-width-modulation and the laser beam is elliptical.
  • DMD Digital Mirror Device
  • the development of the latent electrostatic images proceeds preferably with electrostatically attractable marking material, called toner, that may be in the from of dry solid triboelectrically charged particles or in the form of a dispersion of charged toner particles in a carrier liquid (liquid developer) and such preferably according to the known principles of reversal development.
  • toner electrostatically attractable marking material
  • Liquid toner development may be carried out as described, e.g. in US-P 4,770,967 by development liquid supplied from a tray or by ink jet or by using a liquid toner applicator having slots as described e.g. in US-P 4,545,326 or by using a toner-reservoir with flow-through as described in GB-P 1,125,628.
  • the toner liquid may have a relatively high viscosity as described e.g. in US-P 5,192,638, and may be concentrated on the intermediate roller (intermediate transfer member) by heating it thereon as described e.g. in US-P 5,276,492.
  • Fixing of the toner images on their web support may proceed by any technique known in the art, e.g. by cold pressure roller, contact-heating with hot pressure roller, hot air steam and/or radiant heat.
  • a hot roller fixing device suitable for use in the embodiment of trans-fixing illustrated in present Fig. 1 is described e.g. in US-P 4,550,243.
  • a hot roller (14) suitable for use in hot roller-pressure fixing is described e.g. in US-P 4,550,243 and in IBM J. Res. Develop. Vol. 22, No. 1 Jan. 1978, in the article "Design of the Fusing System for an Electrophotographic Laser Printer” by K.D. Brooms.
  • the present duplex printer may be used for single-pass sequential double-side printing on every flexible web-type support, e.g. paper, plastified paper, plastified fabric, plastic supports, plastified metal web, cardboard, etc... .
  • every flexible web-type support e.g. paper, plastified paper, plastified fabric, plastic supports, plastified metal web, cardboard, etc... .
EP96201030A 1995-05-09 1996-04-17 Elektrostatographischer Vielfarbendruckapparat für sequentielles Duplexdrucken in einem Durchlauf auf einem gewebeartigen Toneraufnahmematerial Ceased EP0742496A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96201030A EP0742496A1 (de) 1995-05-09 1996-04-17 Elektrostatographischer Vielfarbendruckapparat für sequentielles Duplexdrucken in einem Durchlauf auf einem gewebeartigen Toneraufnahmematerial

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP95201185 1995-05-09
EP95201185 1995-05-09
EP96201030A EP0742496A1 (de) 1995-05-09 1996-04-17 Elektrostatographischer Vielfarbendruckapparat für sequentielles Duplexdrucken in einem Durchlauf auf einem gewebeartigen Toneraufnahmematerial

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0848300A1 (de) 1996-12-16 1998-06-17 Agfa-Gevaert N.V. Einseitiges Drucken mit einer Tandemdruckmaschine
WO1998027466A1 (de) * 1996-12-18 1998-06-25 Oce Printing Systems Gmbh Elektrografische druckeinrichtung mit einander gegenüberliegenden druckwerken
DE19827254A1 (de) * 1998-06-18 2000-01-05 Oce Printing Systems Gmbh Elektrografische Druckeinrichtung mit zwei Druckwerken, die auf eine umgelenkte Materialbahn drucken
WO2011096929A1 (en) * 2010-02-05 2011-08-11 Hewlett-Packard Development Company, L.P. Imaging system and method
DE102012222488A1 (de) * 2012-12-06 2014-06-12 Koenig & Bauer Aktiengesellschaft Rollen-Druckmaschine
EP2444855A3 (de) * 2010-09-22 2015-04-15 Miyakoshi Printing Machinery Co., Ltd. Blattzufuhrduplex und Mehrfarbendrucker mit Blattzufuhrduplex

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694073A (en) * 1970-07-20 1972-09-26 Xerox Corp Method for duplexing
US4427285A (en) * 1981-02-27 1984-01-24 Xerox Corporation Direct duplex printing on pre-cut copy sheets
US5132712A (en) * 1990-12-24 1992-07-21 Xerox Corporation Automatic duplex printing apparatus
US5138363A (en) * 1990-03-02 1992-08-11 Minolta Camera Co., Ltd. Transfer device for duplex copier using a single charger and transfer belt
EP0629924A1 (de) * 1993-06-18 1994-12-21 Xeikon Nv Mehrstationsdrucker für elektrostatisches Drucken in einem einzigen Umlauf

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694073A (en) * 1970-07-20 1972-09-26 Xerox Corp Method for duplexing
US4427285A (en) * 1981-02-27 1984-01-24 Xerox Corporation Direct duplex printing on pre-cut copy sheets
US5138363A (en) * 1990-03-02 1992-08-11 Minolta Camera Co., Ltd. Transfer device for duplex copier using a single charger and transfer belt
US5132712A (en) * 1990-12-24 1992-07-21 Xerox Corporation Automatic duplex printing apparatus
EP0629924A1 (de) * 1993-06-18 1994-12-21 Xeikon Nv Mehrstationsdrucker für elektrostatisches Drucken in einem einzigen Umlauf

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0848300A1 (de) 1996-12-16 1998-06-17 Agfa-Gevaert N.V. Einseitiges Drucken mit einer Tandemdruckmaschine
US5999785A (en) * 1996-12-16 1999-12-07 Agfa-Gevaert N.V. Simplex printing with duplex printer
WO1998027466A1 (de) * 1996-12-18 1998-06-25 Oce Printing Systems Gmbh Elektrografische druckeinrichtung mit einander gegenüberliegenden druckwerken
US6141523A (en) * 1996-12-18 2000-10-31 Oce Printing Systems Gmbh Electrographic printing device with opposite-lying printing units
DE19827254A1 (de) * 1998-06-18 2000-01-05 Oce Printing Systems Gmbh Elektrografische Druckeinrichtung mit zwei Druckwerken, die auf eine umgelenkte Materialbahn drucken
DE19827254B4 (de) * 1998-06-18 2005-09-01 OCé PRINTING SYSTEMS GMBH Elektrografische Druckeinrichtung mit zwei Druckwerken, die auf eine umgelenkte Materialbahn drucken
WO2011096929A1 (en) * 2010-02-05 2011-08-11 Hewlett-Packard Development Company, L.P. Imaging system and method
US8985022B2 (en) 2010-02-05 2015-03-24 Hewlett-Packard Development Company, L.P. Imaging system and method
US9176432B2 (en) 2010-02-05 2015-11-03 Hewlett-Packard Indigo B.V. Imaging system and method
EP2444855A3 (de) * 2010-09-22 2015-04-15 Miyakoshi Printing Machinery Co., Ltd. Blattzufuhrduplex und Mehrfarbendrucker mit Blattzufuhrduplex
DE102012222488A1 (de) * 2012-12-06 2014-06-12 Koenig & Bauer Aktiengesellschaft Rollen-Druckmaschine
WO2014086900A1 (de) 2012-12-06 2014-06-12 Koenig & Bauer Aktiengesellschaft Rollen-druckmaschine

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