US3672765A - Apparatus for making two-sided copies from two images on an original - Google Patents

Apparatus for making two-sided copies from two images on an original Download PDF

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Publication number
US3672765A
US3672765A US60500A US3672765DA US3672765A US 3672765 A US3672765 A US 3672765A US 60500 A US60500 A US 60500A US 3672765D A US3672765D A US 3672765DA US 3672765 A US3672765 A US 3672765A
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US
United States
Prior art keywords
images
image
receiver
copy
transfer
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
US60500A
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English (en)
Inventor
Conrad Altmann
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3672765A publication Critical patent/US3672765A/en
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
    • 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
    • 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
    • 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
    • G03G2215/00172—Apparatus for electrophotographic processes relative to the original handling
    • G03G2215/00206—Original medium
    • G03G2215/00261—Plastic
    • G03G2215/0027—Transparent film 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
    • G03G2215/00172—Apparatus for electrophotographic processes relative to the original handling
    • G03G2215/00206—Original medium
    • G03G2215/00261—Plastic
    • G03G2215/00278—Microfiche
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S271/00—Sheet feeding or delivering
    • Y10S271/902—Reverse direction of sheet movement

Definitions

  • This invention relates to a reversing device, and more particularly to a device for reversing a receiver for placing images on opposite sides thereof.
  • the images are then toned and one image is transferred to one side of a receiver.
  • the receiver is then turned over by a novel reversing mechanism and a second image transferred to the opposite side of the receiver and fused. Since there are no intermediate transfers of the image before printing, the density and hence the quality of the image can be maintained more commensurate with the density and quality of the original image. Also the density of the image on the opposite side of the receiver should be substantially the same.
  • the images are projected from opposite sides of an opaque original whereas in a second embodiment adjacent images are projected from an original to be copied on opposite sides of a receiver.
  • FIG. 1 is a schematic longitudinal section of an electrophotogr-aphic apparatus showing a reversing device constructed in accordance with this invention
  • FIG. 2 is a perspective view of a first optical system which may be utilized with the apparatus of FIG. 1;
  • FIG. 3 is a fragmentary plan view of a section of microfilm having adjacent images arranged in one format
  • FIG. 4 is a fragmentary plan view of another section of microfilm having adjacent images arranged in another format.
  • FIG. 5 is a perspective view of a second optical system which may be utilized 'with the apparatus of FIG. 1.
  • the electrophotographic apparatus A of FIG. 1 includes an endless photoconductive belt 10 which includes a photoconductive layer on a conductive backing and is driven by suitable means, such as motor 11 past a charging station 12, an exposure station 13, through a toning station 14, past transfer means such as a first transfer station 15 and a second transfer station 16, a cleaning station 17 and an erase lamp 18.
  • suitable means such as motor 11 past a charging station 12, an exposure station 13, through a toning station 14, past transfer means such as a first transfer station 15 and a second transfer station 16, a cleaning station 17 and an erase lamp 18.
  • suitable means such as motor 11 past a charging station 12, an exposure station 13, through a toning station 14, past transfer means such as a first transfer station 15 and a second transfer station 16, a cleaning station 17 and an erase lamp 18.
  • suitable means such as motor 11 past a charging station 12, an exposure station 13, through a toning station 14, past transfer means such as a first transfer station 15 and a second transfer station 16, a cleaning station 17 and an erase lamp 18.
  • the optical system S for flash exposure at station 13 includes plane mirrors 20 and 21 which project the images from opposite sides of original document 22, mounted in supports 23, through lenses 24 and 25, respectively.
  • the light which forms these images is then reflected off of plane mirror 26 onto photoconductive belt 10 to form electrostatic images 27 and 28, respectively.
  • mirror 26 could be two separate mirrors rather than a single mirror, as shown, or could be omitted entiely if the optics are rotated so that the images are projected directly onto the photoconductive belt from lenses 24 and 25.
  • a receiver sheet 31 is fed from a hopper 32 by a feed mechanism, such as roller 33, through metering rollers 34 and support rollers 35 to transfer station 15.
  • image 28 is transferred from photoconductor to receiver 31.
  • the receiver is then directed upwardly by deflector 29 through a pair of rollers, such as fusing rollers 36 and 37, into a receiver reversing means R.
  • Means such as a compressed air nozzle or air puffer 38, may be activated by suitable means (not shown) to force the receiver against a reverse driving means, such as endless belt 39 which extends between rollers 40 and 41, and cooperates with fusing roller 36 to feed the receiver into position to be brought into contact with photoconductor 10 as it passes between belt 39 and roller 42.
  • a reverse driving means such as endless belt 39 which extends between rollers 40 and 41, and cooperates with fusing roller 36 to feed the receiver into position to be brought into contact with photoconductor 10 as it passes between belt 39 and roller 42.
  • the receiver is turned over so that the opposite side is brought into contact with photoconductor 10 to receive image 27.
  • photoconductor 10 has been fed downwardly past roller 43 around a roller 44, the diameter and spacing of this roller being such that by the time the receiver is reversed by reversing mechanism R, the second image 27 on the photoconductor will be in position to be transferred to the second side of the receiver at the second transfer station 16.
  • the receiver is then deflected by deflector 30 so that this second image is fused by fusing rollers 45 and 46 after being separated from the photoconductor, as shown.
  • receiver 3-1 is fed to a copy receptacle 47.
  • the photoconductor continues to move in a counterclockwise direction, any remaining toner thereon from images 27 and 28 being removed at cleaning station 17 and any remaining electrostatic charge pattern being erased by exposure to erase lamp 18.
  • microfilm 50 of FIG. 3 which includes pairs of spaced images, such as images 51 and images 52 which are arranged side by side, as shown.
  • FIG. 4 An alternative format is shown in FIG. 4 wherein a microfilm strip 50' includes pairs of side by side images 53 and 54, as shown.
  • FIG. 5 An exposure station S for projecting microfilm images is shown in FIG. 5, wherein microfilm 50 is fed from a supply reel 56 past a projection gate defined by spaced rollers 58 and 60 to a take-up reel 62.
  • a light source 64 together with lens 65 uniformly illuminates the images on microfilm 50 so that they are projected by means of a projection lens 66 to a movable mirror 68 which may be brought into the light path to project light onto screen 70 so that the images may be viewed.
  • the screen is provided with image field marks 72 so that the images may be centered on the screen prior to printing.
  • projection lens 66 After centering, mirror 68 is moved out of the projection beam by means (not shown) so that the projection lens now projects the image onto mirror 74 which reflects the images in spaced positions along photoconductor 10, as shown.
  • the projection lens has been illustrated as a single lens 66, this lens can take any form so long as it is constructed so as to project the images onto the photoconductor at the proper spacing for development and transfer to opposite sides of the receiver sheet in the device shown in FIG. 1.
  • projection lens 66 might take the form of two rotatable lenses which include dove prisms to allow image rotation and one of the lens may be moved in a longitudinal direction of the film to allow adjustment of the image spacing. With such an arrangement, it is apparent that the spaced images 51 or the spaced images 52 as shown in FIG.
  • FIG. 3 could be projected or alternatively images arranged in the format of FIG. 4 such as images 53 and 54 could be projected, respectively.
  • the device could be used to project images arranged in other formats.
  • a similar projection system could be used to project adjacent images on.an opaque original or the images to be projected may be spaced from each other rather than being side-by-side.
  • an electrophotographic apparatus having a movable photoconductive member, an exposure station for exposing one side of the photoconductive member to separate images projected from an original document to be copied to form separate electrostatic images on said one side of said photoconductive member, a toning station for developing said electrostatic images, a first transfer station for transferring one developed image to one side of a receiver and means for moving said photoconductive member past said stations, the improvement comprising:
  • a second transfer station for transferring said second image to said other side of said receiver
  • said means for reversing said receiver including a reverse driving means for feeding said receiver to said second transfer station with said other side positioned to receive said second image; means for feeding said receiver from the first transfer station into said reverse driving means; and means for urging said receiver into engagement with said reverse driving means.
  • said photoconductive member includes:
  • said reverse driving means includes an endless belt
  • said feeding means includes a pair of fusing rollers for fusing said first image to said receiver, one of said rollers being positioned adjacent said endless belt to cooperate therewith to feed said reversed receiver to said second transfer station.
  • An electrophotographic apparatus as claimed in claim 1, wherein the improvement further includes:
  • photoconductor diverting means between said first and second transfer stations for directing said photoconductor away from said receiver during reversal of said receiver to bring said second image on said photoconductor into position to be transferred to said other side of said receiver after said receiver is reversed.
  • An electrophotographic apparatus having a photoconductive member movable past a series of electrophotographic stations to form images on opposite sides of a receiver from an original having first and second images thereon, said apparatus comprising:
  • a charging station for placing a substantially uniform electrostatic charge on said photoconductive member
  • an exposure station for projecting said first and second images from the original at spaced positions along said photoconductive member to form spaced first and second electrostatic imagesthereon;
  • a first transfer station for transferring said first toned image to one side of the receiver
  • An electrophotographic apparatus as claimed in claim 5, wherein said exposure station includes:
  • an improved transfer electrophotography method for producing copy images on opposite sides of a copy sheet comprising:
  • said exposing step includes simultaneously projecting light images from opposite sides of a substantially opaque original onto spaced areas of said photoconductor surface.
  • the invention defined in claim 8 further including the step of delaying the movement of said trailing toner image past the operative stations of the apparatus between transfer of said leading and trailing toner images.
  • Improved electrophotographic apparatus for producing copy images on both sides of a copy sheet, said apparatus comprising:
  • first transfer means located along said operative path, for transferring the leading toner image to the first side of the fed copy sheet
  • said exposing means includes means for simultaneously projecting light images from opposite sides of a substantially opaque original onto spaced areas of said photoconductor surface.
  • said exposing means includes means for simultaneously projecting light images of transparencies onto spaced areas of said photoconductor surface.
  • the invention defined in claim 13 further including means for delaying the movement of the trailing toner image past the operative stations of the apparatus between transfer operations on the leading and trailing toner images.
  • Improved electrophotographic apparatus for producing copy image on both sides of a copy sheet, said apparatus comprising:
  • said transfer means includes first and second transfer stations spaced along the operative path and respectively operative on the leading and trailing toner images and wherein said fusing means includes first and second fusers respectively associated with said first and second transfer stations and operative respectively on the leading and trailin toner images.
  • the invention defined in claim 18 further including means for delaying movement along said path of the imaging area bearing the trailing toner image While said copy sheet inverting means is inverting the copy sheet.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (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)
US60500A 1968-03-26 1970-08-03 Apparatus for making two-sided copies from two images on an original Expired - Lifetime US3672765A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US71609268A 1968-03-26 1968-03-26
US6050070A 1970-08-03 1970-08-03

Publications (1)

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US3672765A true US3672765A (en) 1972-06-27

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DE (1) DE1914959B2 (de)

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2352171A1 (de) * 1972-10-17 1974-05-02 Canon Kk Kopiergeraet
FR2212786A5 (de) * 1972-12-29 1974-07-26 Xerox Corp
US3833911A (en) * 1972-12-29 1974-09-03 Xerox Corp Reproduction system and method with simplex and duplex modes of operation
US3841754A (en) * 1973-08-29 1974-10-15 Xerox Corp Duplex reproduction system
US3844654A (en) * 1972-11-16 1974-10-29 Xerox Corp Duplex copying system
US3871763A (en) * 1973-08-02 1975-03-18 Pitney Bowes Inc Photo-conductive material handling device
JPS5075443A (de) * 1973-11-01 1975-06-20
JPS5099553A (de) * 1973-12-28 1975-08-07
DE2424191A1 (de) * 1974-05-17 1975-11-27 Agfa Gevaert Ag Abbildungssystem fuer kopiergeraete
US3926625A (en) * 1971-04-29 1975-12-16 Oce Van Der Grinten Nv Photoconductive belt device and electrophotographic process and apparatus utilizing the same
DE2534977A1 (de) 1974-08-05 1976-02-19 Xerox Corp Verfahren und system zum projizieren der beiden seiten eines originales auf eine bildebene
US3948505A (en) * 1974-11-01 1976-04-06 Control Data Corporation Document turn-around sorter/stacker
JPS5166445U (de) * 1975-11-11 1976-05-26
US3999852A (en) * 1973-01-17 1976-12-28 Canon Kabushiki Kaisha Copying apparatus capable of both-side printing
US4054285A (en) * 1976-03-08 1977-10-18 Xerox Corporation Apparatus for registering and inverting sheets
US4095979A (en) * 1977-02-14 1978-06-20 Eastman Kodak Company Method and apparatus for producing duplex copies
US4140387A (en) * 1976-06-01 1979-02-20 Eastman Kodak Company Apparatus for producing collated copies from two sided originals
US4174905A (en) * 1977-02-14 1979-11-20 Eastman Kodak Company Method and apparatus for producing duplex copies
WO1979001073A1 (en) * 1978-05-16 1979-12-13 Ricoh Kk Reproducing apparatus
US4186662A (en) * 1977-08-22 1980-02-05 A. B. Dick Company Duplexing copying system
US4194829A (en) * 1978-09-15 1980-03-25 Eastman Kodak Company Apparatus for producing duplex copies
US4202266A (en) * 1977-12-07 1980-05-13 A. B. Dick Company Staging mechanism for duplexing copy machines
US4204472A (en) * 1977-08-22 1980-05-27 A. B. Dick Company Duplexing copying system
US4234180A (en) * 1979-06-27 1980-11-18 Xerox Corporation Recirculating document handler configuration
US4262895A (en) * 1979-08-31 1981-04-21 Xerox Corporation Inverter with variable buckling control
US4264183A (en) * 1979-06-04 1981-04-28 Eastman Kodak Company Duplex copying apparatus and method
US4291970A (en) * 1979-11-29 1981-09-29 Eastman Kodak Company Apparatus for producing duplex copies
US4348101A (en) * 1980-09-30 1982-09-07 Sperry Corporation Duplex printing apparatus
US4431303A (en) * 1981-11-04 1984-02-14 Xerox Corporation Sheet handling apparatus for use with a very high speed duplicator
US4443094A (en) * 1982-11-22 1984-04-17 Am International, Inc. Duplicating machine with duplexing capability
US4466607A (en) * 1982-03-08 1984-08-21 The Mead Corporation Sheet inverting device
US4512651A (en) * 1977-07-05 1985-04-23 Eastman Kodak Company Collating document feeder and reproduction apparatus having copy duplexing capabilities
US4593995A (en) * 1984-06-11 1986-06-10 Eastman Kodak Company Method and apparatus for producing multiple sets of copies of a document
DE3514779A1 (de) * 1985-04-24 1986-10-30 Wolfgang 8800 Ansbach Frieß Projektionsvorrichtung, insbesondere muenzprojektor
US4660963A (en) * 1985-12-30 1987-04-28 Xerox Corporation Auto duplex reproduction machine
USRE32422E (en) * 1977-02-14 1987-05-19 Eastman Kodak Company Method and apparatus for producing duplex copies
USRE32541E (en) * 1976-01-15 1987-11-10 Xerox Corporation Fluidic feeding of documents to an exposure station
US4708468A (en) * 1985-12-30 1987-11-24 Xerox Corporation Self adjusting paper guide
US4708462A (en) * 1985-12-30 1987-11-24 Xerox Corporation Auto duplex reproduction machine
US4777498A (en) * 1985-05-14 1988-10-11 Canon Kabushiki Kaisha Image forming apparatus
US4825245A (en) * 1987-04-16 1989-04-25 Kentek Information Systems, Inc. Duplex printing module for an electrographic printer
EP0392632A1 (de) * 1989-04-13 1990-10-17 Océ-Nederland B.V. Verfahren und Vorrichtung zum Übertragen von zwei Bildern auf beide Seiten eines Empfangsblattes
US5070369A (en) * 1987-11-10 1991-12-03 Eastman Kodak Company Electrostatographic method and apparatus for producing multicolor duplex reproductions
US5095371A (en) * 1987-02-28 1992-03-10 Ricoh Company, Ltd. Duplex image forming system with number of single side printed sheets in feed path selected before printing second side
EP0657790A2 (de) * 1993-12-09 1995-06-14 Nec Corporation Verfahren und Gerät zum Erzeugen von Bildern auf beiden Seiten eines Aufzeichnungspapiers ohne dieses Papier zu wenden
EP0848300A1 (de) 1996-12-16 1998-06-17 Agfa-Gevaert N.V. Einseitiges Drucken mit einer Tandemdruckmaschine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983815A (en) * 1975-01-29 1976-10-05 Honeywell Information Systems, Inc. Apparatus and method for printing on plain paper
JPS53112738A (en) * 1977-02-14 1978-10-02 Eastman Kodak Co Electrophotographic system for making possible copying at both sides and device therefor

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926625A (en) * 1971-04-29 1975-12-16 Oce Van Der Grinten Nv Photoconductive belt device and electrophotographic process and apparatus utilizing the same
DE2352171A1 (de) * 1972-10-17 1974-05-02 Canon Kk Kopiergeraet
US3844654A (en) * 1972-11-16 1974-10-29 Xerox Corp Duplex copying system
FR2212786A5 (de) * 1972-12-29 1974-07-26 Xerox Corp
US3833911A (en) * 1972-12-29 1974-09-03 Xerox Corp Reproduction system and method with simplex and duplex modes of operation
US3999852A (en) * 1973-01-17 1976-12-28 Canon Kabushiki Kaisha Copying apparatus capable of both-side printing
US3871763A (en) * 1973-08-02 1975-03-18 Pitney Bowes Inc Photo-conductive material handling device
US3841754A (en) * 1973-08-29 1974-10-15 Xerox Corp Duplex reproduction system
JPS5075443A (de) * 1973-11-01 1975-06-20
JPS5099553A (de) * 1973-12-28 1975-08-07
JPS599053B2 (ja) * 1973-12-28 1984-02-29 ゼロツクス コ−ポレ−シヨン 両面複写装置
DE2424191A1 (de) * 1974-05-17 1975-11-27 Agfa Gevaert Ag Abbildungssystem fuer kopiergeraete
DE2534977A1 (de) 1974-08-05 1976-02-19 Xerox Corp Verfahren und system zum projizieren der beiden seiten eines originales auf eine bildebene
DE2560246C2 (de) * 1974-08-05 1985-09-26 Xerox Corp., Rochester, N.Y. Elektrophotographisches Reproduzierverfahren sowie Kopiervorrichtung
US3948505A (en) * 1974-11-01 1976-04-06 Control Data Corporation Document turn-around sorter/stacker
JPS5166445U (de) * 1975-11-11 1976-05-26
USRE32541E (en) * 1976-01-15 1987-11-10 Xerox Corporation Fluidic feeding of documents to an exposure station
US4054285A (en) * 1976-03-08 1977-10-18 Xerox Corporation Apparatus for registering and inverting sheets
US4140387A (en) * 1976-06-01 1979-02-20 Eastman Kodak Company Apparatus for producing collated copies from two sided originals
US4174905A (en) * 1977-02-14 1979-11-20 Eastman Kodak Company Method and apparatus for producing duplex copies
USRE32422E (en) * 1977-02-14 1987-05-19 Eastman Kodak Company Method and apparatus for producing duplex copies
US4095979A (en) * 1977-02-14 1978-06-20 Eastman Kodak Company Method and apparatus for producing duplex copies
US4512651A (en) * 1977-07-05 1985-04-23 Eastman Kodak Company Collating document feeder and reproduction apparatus having copy duplexing capabilities
US4186662A (en) * 1977-08-22 1980-02-05 A. B. Dick Company Duplexing copying system
US4204472A (en) * 1977-08-22 1980-05-27 A. B. Dick Company Duplexing copying system
US4202266A (en) * 1977-12-07 1980-05-13 A. B. Dick Company Staging mechanism for duplexing copy machines
WO1979001073A1 (en) * 1978-05-16 1979-12-13 Ricoh Kk Reproducing apparatus
US4385825A (en) * 1978-05-16 1983-05-31 Ricoh Co., Ltd. Copying apparatus
US4194829A (en) * 1978-09-15 1980-03-25 Eastman Kodak Company Apparatus for producing duplex copies
US4264183A (en) * 1979-06-04 1981-04-28 Eastman Kodak Company Duplex copying apparatus and method
US4234180A (en) * 1979-06-27 1980-11-18 Xerox Corporation Recirculating document handler configuration
US4262895A (en) * 1979-08-31 1981-04-21 Xerox Corporation Inverter with variable buckling control
US4291970A (en) * 1979-11-29 1981-09-29 Eastman Kodak Company Apparatus for producing duplex copies
US4348101A (en) * 1980-09-30 1982-09-07 Sperry Corporation Duplex printing apparatus
US4431303A (en) * 1981-11-04 1984-02-14 Xerox Corporation Sheet handling apparatus for use with a very high speed duplicator
US4466607A (en) * 1982-03-08 1984-08-21 The Mead Corporation Sheet inverting device
US4443094A (en) * 1982-11-22 1984-04-17 Am International, Inc. Duplicating machine with duplexing capability
US4593995A (en) * 1984-06-11 1986-06-10 Eastman Kodak Company Method and apparatus for producing multiple sets of copies of a document
DE3514779A1 (de) * 1985-04-24 1986-10-30 Wolfgang 8800 Ansbach Frieß Projektionsvorrichtung, insbesondere muenzprojektor
US4777498A (en) * 1985-05-14 1988-10-11 Canon Kabushiki Kaisha Image forming apparatus
US4660963A (en) * 1985-12-30 1987-04-28 Xerox Corporation Auto duplex reproduction machine
US4708468A (en) * 1985-12-30 1987-11-24 Xerox Corporation Self adjusting paper guide
US4708462A (en) * 1985-12-30 1987-11-24 Xerox Corporation Auto duplex reproduction machine
US5095371A (en) * 1987-02-28 1992-03-10 Ricoh Company, Ltd. Duplex image forming system with number of single side printed sheets in feed path selected before printing second side
US4825245A (en) * 1987-04-16 1989-04-25 Kentek Information Systems, Inc. Duplex printing module for an electrographic printer
US5070369A (en) * 1987-11-10 1991-12-03 Eastman Kodak Company Electrostatographic method and apparatus for producing multicolor duplex reproductions
EP0392632A1 (de) * 1989-04-13 1990-10-17 Océ-Nederland B.V. Verfahren und Vorrichtung zum Übertragen von zwei Bildern auf beide Seiten eines Empfangsblattes
EP0657790A2 (de) * 1993-12-09 1995-06-14 Nec Corporation Verfahren und Gerät zum Erzeugen von Bildern auf beiden Seiten eines Aufzeichnungspapiers ohne dieses Papier zu wenden
EP0657790A3 (de) * 1993-12-09 1997-06-04 Nec Corp Verfahren und Gerät zum Erzeugen von Bildern auf beiden Seiten eines Aufzeichnungspapiers ohne dieses Papier zu wenden.
EP0848300A1 (de) 1996-12-16 1998-06-17 Agfa-Gevaert N.V. Einseitiges Drucken mit einer Tandemdruckmaschine

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Publication number Publication date
DE1914959A1 (de) 1969-10-16
DE1914959B2 (de) 1970-08-13

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