US3671118A - Apparatus for creating duplex reproductions - Google Patents

Apparatus for creating duplex reproductions Download PDF

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Publication number
US3671118A
US3671118A US887845A US3671118DA US3671118A US 3671118 A US3671118 A US 3671118A US 887845 A US887845 A US 887845A US 3671118D A US3671118D A US 3671118DA US 3671118 A US3671118 A US 3671118A
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US
United States
Prior art keywords
image
reading
support material
drum
duplex
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Expired - Lifetime
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US887845A
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English (en)
Inventor
Joseph Fantuzzo
Frazer D Punnett
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Xerox Corp
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Xerox Corp
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Publication date
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Publication of US3671118A publication Critical patent/US3671118A/en
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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

Definitions

  • This invention relates in general to producing reproductions of subject matter and, in particular, to an improved method and apparatus for producing duplicate reproductions on two opposite surfaces of a support material.
  • this invention relates to a duplex method and apparatus wherein a right reading latent electrostatic image of subject matter to be reproduced is formed and developed on a photosensitive surface and is transferred therefrom to a storage medium to be retained thereon. A second wrong reading or mirror latent image is also formed and developed on the photosensitive surface and is transferred directly to one surface of a support material at a transfer station. The other surface of the support material receives through transfer the developed image retained by the storage medium to produce a duplex reproduction of the original.
  • a xerographic surface comprising a layer of photoconductive material on a conductive backing is given a uniform electric charge on the surface and then is exposed to the subject matter to be reproduced by various projection techniques. This exposure discharges the surface in accordance with the light intensity reaching it thereby creating a latent electrostatic image on or in the surface.
  • Development of the image is effected by developers which may comprise, in general, a mixture of suitable, pigmented or dyed, resin base powder, hereinafter referred to as toner, which is brought into contact with the surface by various Well-known development techniques.
  • the toner powder is brought into surface contact with a photoconductive coating and is held there electrostatically in a pattern corresponding to the latent electrostatic image. Thereafter, the developed xerographic image may be transferred to a support material to which it may be afiixed by any suitable means such as heat fusing.
  • Another object of this invention is to improve the method and apparatus for producing duplex reproductions.
  • a duplex method and apparatus that effectively produces reproductions on two sides of a support material.
  • the method and apparatus disclosed herein utilizes a photosensitive surface whereon two electrostatic latent images of opposite reading are created and developed.
  • a right reading latent image is first formed and developed on the surface to be thereupon transferred to an image storage material where it is stored until a developed second wrong reading image on the photoconductor subsequently reaches the transfer station.
  • each of the respective developed images thereon are transferred to opposite sides of the support material.
  • the transferred image lying on both sides of the support material are transported to a fusing area where a permanent duplex reproduction is produced.
  • the novel method and apparatus of the present invention produces satisfactory duplex reproductions with a minimum of elements.
  • the original copy may comprise, for example, a two sided original document, two separate sides from two originals, or a side by side microfilm document and the like.
  • the invention requires only one storage medium and a single photosensitive surface to effect a duplex reproduction of the original copy wherein merely one image transfer is necessary besides the actual transfers to the support material.
  • the duplex method and device of the present invention utilizes a dry toner image to be transferred electrostatically to a support material in a manner not heretofore possible because the prior duplex systems require use of tackified images to effect a duplex reproduction.
  • the present system disclosed herein results in a faster and more economical device which readily produces high quality duplex reproductions with less complexity than prior art duplex systems.
  • FIG. 1 is a schematic illustration of a duplex xerographic reproduction device of the present invention.
  • FIG. 1 there is shown a schematic view of a drum type automatic xerographic reproducing machine for producing duplex reproductions according to the present invention.
  • the central element of the apparatus is a drum I mounted for rotation and drivable in a clockwise direction by motor M.
  • the drum comprises an outer surface with a layer of photoconductive insulating material such as, for example, vitreous selenium, or any other suitable surface.
  • a uniform electrostatic charge is placed on the photoconductor surface of the drum by means of a conventional corona charging device 2.
  • the uniformly charged surface of the drum is then moved to an exposure means 3 which exposes the charged surface to copy to be reproduced to thereby form a latent electrostatic image of the copy on the photoconductor drum surface.
  • the exposure means may comprise, for example, a device which wil alternately reverse the image of the copy or document to be reproduced.
  • a reversing image optical system may be any conventional type as, for example, disclosed in the aforementioned US. Pat. No. 3,318,212 to Rubin wherein microfilm originals are being duplicated.
  • Other exposure means also may be utilized in conjunction with the present invention to expose the drum to alternately reading images of two sided original documents, one side from two documents and the like.
  • the optical means exposes the charged surface to copy to be reproduced and forms a first right reading latent electrostatic image on the photoconductor drum. Following the formation of a right reading electrostatic image, the image moves past a conventional development device 4 to bring the latent image into contact with developer material, such as toner powder or other electroscopic material, for development thereof.
  • developer material such as toner powder or other electroscopic material
  • the visible first right reading image moves to a transfer station -5 which includes a corotron 6 mounted adjacent a storage medium 7 of suitable material such as, for example, a dielectric belt of Mylar. It is within the scope of the invention to use other forms and materials for the storage medium such as a drum and the like or other materials capable of storing a visible toner image.
  • the belt 7 is mounted on rollers 8 to allow the surface of the storage medium to be driven by a suitable motor means (not shown) in direct confrontation to the surface of the drum 1.
  • a conventional corona device 6 is mounted on the opposite side of the dielectric belt 7 to transfer the developed right reading image from the drum to the belt by applying an electrical field to the back thereof.
  • the visible right reading image transferred from the drum thereupon is reversed in reading when placed upon the dielectric material.
  • the length of the dielectric belt may be of any convenient size, such as, for example, one-half the circumference of the photoconductor drum. Further, it is desirable to drive the belt at a speed equal to the surface speed of the drum although other speeds of the belt may be selected if desired.
  • the time sequence of the charging, exposure and development of the two oppositely reading images in the machine disclosed herein is effected by the machine control circuit (not shown).
  • the particular selected time sequence of operation depends on such factors as the location of various stations around the drum, the length of and velocity of the storage belt relative to the size and surface speed of the drum and the like.
  • the area of the surface of the drum to receive the first right reading image is located diametrically opposite to the area of the drum supporting the wrong reading image. Therefore, when the first right reading image reaches the transfer station 5 for transfer to the storage belt 7 the center of the first image is situated one-half of the circumference of the drum from the second wrong reading image.
  • the image transferred will move on the belt and return to confront the transfer station 5 at the instant the visible wrong reading latent image on the drum moves to the transfer station. Accordingly, the two images lying respectively on the storage belt and the drum confront each other at the same time.
  • a sheet of support material 9 is delivered to end 7a of the storage belt 7 of a conventional sheet feeding mechanism (not shown).
  • Paper tacking corotrons 10 are mounted adjacent end 7a of the belt on the opposite side of the roller 7 wherein the sheet of support material is fed between the belt and the corotrons 10 and a charge is applied by the corotrons to the support material to cause the sheet to adhere to the storage belt directly over the toner image retained thereon.
  • the storage belt carries the sheet to the transfer station 5 and the corotron 6 applies an electric field to the back of the sheet to transfer the developed image lying on the drum to one surface of the support material.
  • the sheet of support material thereupon retains on one surface the developed image transferred from the drum 1 and the opposite surface of the sheet is in contact with the developed image lying on the storage belt.
  • a second transfer corotron 11 is positioned at end 7b of the storage belt to apply an electric field to the sheet material as it is carried by the adherence of the sheet to the belt. The electric field produced by the second transfer corotron 11 transfers the image stored on the belt 7 therefrom to the surface of the sheet 9 of support material.
  • a conveying means 12 thereafter carries the sheet retaining an image on each surface to a suitable conventional fusing means 13 to afiix the developed image on each surface to the sheet to produce a permanent duplex copy.
  • the first developed image stored on the belt creates a right reading toner image on one side of the support material when transferred thereto.
  • the mirror toner image transfered from the drum to the other side of the support material likewise creates a right reading toner image and a suitable reading duplex is produced.
  • the exposure means creating the alternately reversed images was illustrated as a single alternately reversing exposure device.
  • two separate exposure devices may be utilized to optically create each of the opposite reading images upon the photoconductive drum sequentially or simultaneously.
  • the two images may be formed on different areas of the drum other than diametrically opposite ones as disclosed herein.
  • the photoconductive surface was described for convenience of illustration as that being of a xerographic drum but the invention may also employ other photosensitive members such as plates, webs and the like.
  • the relative speed and length of the dielectric material and the photosensitive surface may be selected to be any desired magnitude other than as disclosed which would insure the images on each member to effectively transfer on both sides of the support material. It is further within the scope of the invention to store the first developed image on a stationary belt or surface while the second image is developed if so desired.
  • Apparatus for obtaining right reading xerographic toner images on opposite sides of the support member comprising a continuous reusable photosensitive surface supported for movement relative to charging, exposing and developing means for creating right and reverse reading toner images on the photosensitive surface,
  • first electrostatic transfer means adjacent the photo sensitive surface for electrostatically transferring both right and reverse reading images from the photosensitive surface
  • a single continuous, reusable storage surface adjacent said photosensitive surface for receiving only right reading images electrostatically transferred directly from the photosensitive surface by the first transfer 6 means and for storing the received image and recycling it past the first transfer means simultaneously with the passage of a reverse reading image on the photosensitive surface past the first transfer means, feed means for transporting a support member between the photosensitive and storage surfaces to receive only reverse reading images electrostatically transferred directly from the photosensitive surface by the first transfer means and for preventing transfer of the reverse images to the storage surface by the first transfer means,
  • second electrostatic transfer means adjacent the storage surface and support member receiving a reverse image at the first transfer means for electrostatically transferring an image on the storage surface to the free side of said support member
  • the storage surface includes a belt of a length equal to said predetermined distance and adapted to be moved at the selected speed of the photosensitive surface whereby the stored image lying on the belt returns to the first transfer means at the same time a reverse reading image on the photosensitive surface moves past the first transfer means.
  • the apparatus of claim 1 further comprises fusing means to affix the toner images transferred to the two surfaces of the support members to produce a permanent duplex copy.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimiles In General (AREA)
US887845A 1969-12-24 1969-12-24 Apparatus for creating duplex reproductions Expired - Lifetime US3671118A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88784569A 1969-12-24 1969-12-24

Publications (1)

Publication Number Publication Date
US3671118A true US3671118A (en) 1972-06-20

Family

ID=25391974

Family Applications (1)

Application Number Title Priority Date Filing Date
US887845A Expired - Lifetime US3671118A (en) 1969-12-24 1969-12-24 Apparatus for creating duplex reproductions

Country Status (11)

Country Link
US (1) US3671118A (de)
JP (1) JPS4937538B1 (de)
BE (1) BE760746A (de)
CA (1) CA922768A (de)
CH (1) CH526137A (de)
DE (1) DE2062591C3 (de)
ES (1) ES386707A1 (de)
FR (1) FR2075126A5 (de)
GB (1) GB1282808A (de)
NL (1) NL7018565A (de)
SE (1) SE366403B (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841754A (en) * 1973-08-29 1974-10-15 Xerox Corp Duplex reproduction system
US3976370A (en) * 1973-12-03 1976-08-24 Xerox Corporation Belt transfer and fusing system
US3986773A (en) * 1972-01-17 1976-10-19 Hoechst Aktiengesellschaft Apertured conveyor belt for transporting copy material
US4072412A (en) * 1974-12-28 1978-02-07 Canon Kabushiki Kaisha Image transfer device
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
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
US4413898A (en) * 1982-05-17 1983-11-08 Eastman Kodak Company Photoelectrophoretic duplex imaging apparatus and method
US4512651A (en) * 1977-07-05 1985-04-23 Eastman Kodak Company Collating document feeder and reproduction apparatus having copy duplexing capabilities
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
US4714939A (en) * 1985-11-04 1987-12-22 Eastman Kodak Company Electrographic reproduction apparatus
US5159392A (en) * 1990-04-23 1992-10-27 Ricoh Company, Ltd. Image forming apparatus for forming an image on one or both sides of a recording medium
US5572274A (en) * 1989-01-04 1996-11-05 Indigo N.V. Liquid developer imaging system and method utilizing an intermediate transfer member
US5636349A (en) * 1988-09-08 1997-06-03 Indigo N.V. Method and apparatus for imaging using an intermediate transfer member
US5745829A (en) * 1989-01-04 1998-04-28 Indigo N.V. Imaging apparatus and intermediate transfer blanket therefor
US5815783A (en) * 1989-12-06 1998-09-29 Indigo N.V. Method and apparatus for printing on both sides of a substrate

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE832115A (fr) 1974-08-05 1975-12-01 Procede et machine de reproduction recto-verso
JPS5518653A (en) * 1978-07-28 1980-02-08 Canon Inc Transfer device
DE3940217C2 (de) * 1988-12-05 1996-05-09 Ricoh Kk Aufzeichnungsgerät
US5204716A (en) * 1988-12-05 1993-04-20 Ricoh Company, Ltd. Side-free recording apparatus
DE4203265C2 (de) * 1991-02-25 1996-12-19 Siemens Nixdorf Inf Syst Druck- oder Kopiergerät mit beidseitig eines Aufzeichnungsträger-Transportkanals angeordneten Zwischenträgern für ein- oder mehrfarbigen Simplex- oder Duplexdruck

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986773A (en) * 1972-01-17 1976-10-19 Hoechst Aktiengesellschaft Apertured conveyor belt for transporting copy material
US3841754A (en) * 1973-08-29 1974-10-15 Xerox Corp Duplex reproduction system
US3976370A (en) * 1973-12-03 1976-08-24 Xerox Corporation Belt transfer and fusing system
US4072412A (en) * 1974-12-28 1978-02-07 Canon Kabushiki Kaisha Image transfer device
USRE32541E (en) * 1976-01-15 1987-11-10 Xerox Corporation Fluidic feeding of documents to an exposure station
US4140387A (en) * 1976-06-01 1979-02-20 Eastman Kodak Company Apparatus for producing collated copies from two sided originals
US4095979A (en) * 1977-02-14 1978-06-20 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
US4174905A (en) * 1977-02-14 1979-11-20 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
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
US4413898A (en) * 1982-05-17 1983-11-08 Eastman Kodak Company Photoelectrophoretic duplex imaging apparatus and method
US4714939A (en) * 1985-11-04 1987-12-22 Eastman Kodak Company Electrographic reproduction apparatus
US5636349A (en) * 1988-09-08 1997-06-03 Indigo N.V. Method and apparatus for imaging using an intermediate transfer member
US5572274A (en) * 1989-01-04 1996-11-05 Indigo N.V. Liquid developer imaging system and method utilizing an intermediate transfer member
US5745829A (en) * 1989-01-04 1998-04-28 Indigo N.V. Imaging apparatus and intermediate transfer blanket therefor
US5815783A (en) * 1989-12-06 1998-09-29 Indigo N.V. Method and apparatus for printing on both sides of a substrate
US5159392A (en) * 1990-04-23 1992-10-27 Ricoh Company, Ltd. Image forming apparatus for forming an image on one or both sides of a recording medium

Also Published As

Publication number Publication date
DE2062591C3 (de) 1978-12-21
BE760746A (fr) 1971-06-23
ES386707A1 (es) 1973-04-01
CA922768A (en) 1973-03-13
FR2075126A5 (de) 1971-10-08
SE366403B (de) 1974-04-22
GB1282808A (en) 1972-07-26
CH526137A (de) 1972-07-31
NL7018565A (de) 1971-06-28
DE2062591A1 (de) 1971-07-01
DE2062591B2 (de) 1978-04-27
JPS4937538B1 (de) 1974-10-09

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