US3612681A - Electrophotographic copying device - Google Patents

Electrophotographic copying device Download PDF

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Publication number
US3612681A
US3612681A US816568A US3612681DA US3612681A US 3612681 A US3612681 A US 3612681A US 816568 A US816568 A US 816568A US 3612681D A US3612681D A US 3612681DA US 3612681 A US3612681 A US 3612681A
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United States
Prior art keywords
copy paper
original
separating
strip member
plate
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
US816568A
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English (en)
Inventor
Yoshio Itoh
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Canon Inc
Original Assignee
Canon Inc
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Filing date
Publication date
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Publication of US3612681A publication Critical patent/US3612681A/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
    • G03G15/225—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 using contact-printing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/02—Exposure apparatus for contact printing
    • G03B27/14—Details
    • G03B27/24—Separating the original from the print
    • 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

Definitions

  • the present invention provides an electrophotographic copying device of the type in which a copy paper is maintained in direct contact with an original to be copied.
  • the device includes auxiliary separating means in the form of an elongated strip interposed between marginal portions of the copy paper and the original along one side of the advancing passage of the copy paper and original and separating means cooperating with said auxiliary separating means to separate the copy paper from the original.
  • the present invention relates to an electrophotographic copying device and more particularly an electrophotographic device provided with improved means for separating a copy paper from an original.
  • a copy paper having a photosensitive layer is unifonnly electrically charged before or after the copy paper is superposed on an original to be copied and the copy paper,
  • the copy paper which has been electrically attracted to the original, is separated therefrom and the electrostatic latent image formed on the photosensitive layer of the copy paper is developed by a suitable developing agent having an electrical polarity.
  • the developed image is fixed to the copy paper by a suitable means.
  • the copy paper is closely contacted with the original so that special means must be provided for separating the copy from the original prior to practice of the next step.
  • special means must be provided for separating the copy from the original prior to practice of the next step.
  • the copy paper and the original are advanced by a pair of feed rollers having different peripheral speeds so that the leading edges of the copy paper and the original are displaced from each other and in this state advanced toward the separating position.
  • the original and the copy paper are charged and exposed in superposed relation, or the previously electrically charged copy paper is superposed upon the original and then exposed, so that they are electrostatically attracted to each other, thereby making it difficult to separate the copy paper from the original. That is, even by the above-described separating method, separation is still difiicult.
  • a further separating method disclosed is such that between the original and the copy paper there is interposed a length of a thread, 'wire or sheet or the like during the time when the copy paper is superposed upon the original and the photosensitive layer is electrically charged and exposed.
  • this separating means is not preferable.
  • the primary object of the present invention is to provide an electrophotographic copying device incorporating therein means for easily separating an original from a copy paper. According to the present invention, this can be attained by the provision of auxiliary separating means, in the form of an elongated striplike material extending between marginal portions of the original and the copy paper along one side of the passage of their advancement, which will not adversely affect the copying operation, and wedge-shaped separating means disposed in the vicinity of said auxiliary separating means.
  • Another object of the present invention is to provide an electrophotographic copying device incorporating therein a novel means for positively separating an original from a copy paper, thus completely eliminating the defects encountered in conventional separating means.
  • Another object of the present invention is to provide an electrophotographic copying device incorporating therein separating means and auxiliary separating means for easily separating an original from a copy paper.
  • a further object of the present invention is to provide an electrophotographic copying device incorporating therein a novel separating means which requires no power to drive the same for separating an original from a copy paper.
  • an original and a copy paper are advanced with an auxiliary separating means being interposed therebetween along one side of the passage thereof while the copy paper is charged and exposed.
  • auxiliary separating means At the end portion of said auxiliary separating means are disposed wedge-shaped separating members having incliningside edges transversely of said passage, whereby the original and the copy paper are easily separated respectively transversely of said passage from the side of said auxiliary separating means toward the opposite side.
  • FIG. I is a sectional view of an embodiment of an electrophotographic photocopying device according to the present invention:
  • FIG. 2 is a perspective view of essential portions inside the device shown in FIG. 1;
  • FIG. 3 is a plan view of the inside of the device of FIG. 1;
  • FIG. 4 is a perspective view of a copy-original-separating mechanism incorporated in the device of FIG. I;
  • FIG. 5 is a perspective view of pressure plates disposed below the exposure device incorporated in the copying device of FIG. 1;
  • FIG. 6 is a sectional view of another embodiment of the present invention.
  • a copy paper 1 is guided by a guide plate 2 attached to a machine frame 100.
  • an original guide plate 4 for separating the original 3 from the copy 1 and guiding the original.
  • the original guide plate 4 is attached to the sideplate 45 as best shown in FIG. 2.
  • a pair of feed rollers 5 and 6 is disposed backwardly of both of the guide plates 2 and 4 and rotatably joumaled between sideplates 60. At least one of the feed rollers 5 or 6 is driven by a driving means such as motor not shown. Backwardly of the pair of feed rollers 5 and 6 are disposed charging devices 7 and 740 for imparting charge to the copy paper 1.
  • the charging devices 7 and 7' are mounted upon the sideplates 60 respectively through supporting members not shown and have corona electrodes 70 and 70' surrounded by shield cases 71 and 7l
  • the electrodes 70 and 70 are connected to the opposing polarity terminals of a highvoltage source not shown.
  • An exposure device 8 is disposed backwardly of the charging devices 7 and 7' for forming an electrostatic image upon the copy paper 1 and comprises an exposure light source 9, a hood covering the upper half of the light source 9 and a shield frame 19 for preventing transmission of light in undesired directions.
  • the exposure device 8 is disposed between the sideplates 60 through a suitable support.
  • pressure plates 10 and 10 for guiding the superposed original 3 and the copy paper 1 and light emanating from the exposure lamp 9 illuminates the copy paper 1 through the pressure plate 10.
  • the pressure plate must be transparent.
  • a pair of delivery rollers 11 and 12 joumaled rotatably between the sideplates 60. At least one of these delivery rollers must be driven by a suitable drive means such as motor not shown.
  • a pair of original delivery rollers 13 and 14 are rotatably joumaled between the sideplates 60 for delivering or discharging the original 3 out of the photocopying machine into for example a tray disposed outside of the machine.
  • the copy paper and original guide plates 2 and 4 In order that the original 3 may be transported or advanced forwardly and substantially horizontally, it is preferable that the copy paper and original guide plates 2 and 4, the pair of feed rollers 5 and 6, the charging device 7 and 7' the exposure device 8 and the pairs of delivery rollers 11 and 12, 13 and 14 are all disposed at the same height.
  • rollers 15 and 16 for advancing the copy paper bearing thereupon the electrostatic latent image toward the developing section.
  • at least one of the rollers 15 or 16 must be driven by suitable drive means such as motor not shown.
  • the rollers 12 and 16 In order to prevent the destruction of the electrostatic latent image upon the copy paper 1, the rollers 12 and 16 must be made of an electrically insulating material.
  • Reference numeral 17 designates a developing device for developing the electrostatic image upon the copy paper 1 into a visible image and is shown as a liquidtype developing device.
  • a pair of guide plates 43 are disposed within the developing device 17 and a pair of rollers 21 and 41 are provided for squeezing out the developing solution remaining upon the copy paper.
  • Any other suitable developing device - for example, magnetic brush developing device, powder cloud developing device and the like may be utilized as the developing device 17.
  • a guide plate 18 for image fixing is so arranged that heated air from an air-heating fan 20 disposed above the guide plate 18 may be directed upon the surface of the copy paper 1 passing over the guide plate 18.
  • a pair of delivery rollers 22 and 42 are disposed for delivering or discharging the processed copy paper 1 out of the photocopying machine into a tray not shown.
  • the pairs of rollers 15 and I6, 21 and 41, and 22 and 42 are rotatably supported between the sideplates 60. At least one roller of each pair of rollers must be driven by drive means not shown.
  • Reference numeral 23 designates an auxiliary separating member for preventing the marginal portions of copy paper 1 and the original 3 from contacting each other.
  • the auxiliary separating member 23 is in the form of an elongated strip, extending along one side of the passage of the original and copy paper from the outlet side of the original guide plate 4, toward the original-copy-separating members which will be described in more detail hereinafter, in such a manner that the copying operation will not be affected by this arrangement of the auxiliary separating member 23.
  • the auxiliary separating member 23 is securely fixed to the guide plate 4.
  • the auxiliary separating member 23 is made of an electrically insulating (insulative), smooth, sheetlike material.
  • the rear end portion of the auxiliary separating member 23 is disposed in contact with the separating member which will be described hereinafter.
  • Relief portions or reduced-diameter portions 28 and 51 are formed at one side portions of the feed rollers 5 and 6 respectively.
  • Similar relief portions 29 and 52 are formed at one side portions of the pair of delivery rollers 11 and 12. The diameters of these relief portions are smaller than those of the rollers.
  • FIG. 5 illustrates the pressure plates 10 and 10' disposed below the exposure device 8.
  • Relief portions 53 and 54 are formed in the pressure plates 10 and 10' respectively and the thickness of the relief portion is less than that of its corresponding pressure plate.
  • reference numeral 27 designates a wedge-shaped separating member attached to the sideplates and the leading edge of the separating member 27 contacts'the auxiliary separating member 23 and is disposed immediately backwardly of the roller 12.
  • the separating member 27 is curved so as to guide the copy paper bearing the electrostatic image thereupon and being delivered from the pair of rollers 11 and 12.
  • Reference numeral indicates the curving side edge of the separating member 27 for separating the copy paper from the original from the side close to the auxiliary separating member 23 toward the opposite side thereof transversely of the copy paper and the original.
  • Reference numeral 26 is another separating member having a flat surface and being disposed in a wedge shape so as to provide an inclining side edge 24.
  • both of the separating members 26 and 27 are made of an electrically insulating, thin and smooth sheetlike material. It is also preferable that the angle a of the wedge formed by the curving side edges 24 and 25 of the separating members 26 and 27 is within the range of from 5 to Next the mode of operation of the device having the construction as described hereinabove will be described.
  • the copy paper 1 is placed upon the guide plate 2 with the photosensitive layer of the copy paper 1 being directed downwardly while the original 3 is placed upon the guide plate 4 with the image of the original to be copied being directed downwardly.
  • the copy paper 1 and the original 3 are fed into the pair of rollers 5 and 6 simultaneously.
  • the auxiliary separating member 23 is interposed between the copy paper 1 and the original 3 and that the original 3 and the copy paper 1 are advanced by the rollers while being partially separated from each other by the auxiliary separating member through the charging and exposure devices until they are finally separated from each other by the separating members 26 and 27.
  • the photosensitive layer of the copy paper 1 is sensitized by corona discharge between the pair of corona discharge electrodes 70 and 70 of the discharging devices 7 and 7'.
  • both of the copy paper 1 and the original 3 are advanced toward the pairs of delivery rollers 11 and 12 by means of suitable transporting or advancing means such as rollers drivingly connected to an electric motor not shown and after passing through the delivery rollers, the copy paper is separated from the original.
  • the elongated striplike auxiliary separating member 23 extends from the guide plates toward the position at which the copy paper 1 is separated from the original 3, one lateral side (marginal) portion of the copy paper 1 and the original 3 being spaced apart while being advanced after having been electrically charged. Said one lateral side portion of the copy paper 1 advanced through the relief portion 52 formed in the roller 12 and the auxiliary separating member 23 abuts against the separating member 27 having the curved side edge 25 disposed backwardly of the pair of rollers 29 and 52 so that the copy paper 1 is separated from the original 3 from the side edge on the side of the auxiliary separating member 23 toward the opposite side transversely of the copy paper 1 by the curving side edge 25 as the copy paper 1 is advanced.
  • the separated copy paper 1, bearing thereupon the electrostatic latent image, is guided downwardly by the separating member 27 into the pair of feed rollers 15 and 16.
  • the copy paper 1 emerging from the feed rollers 15 and 16 is passed through a copy guide 43 disposed in the liquid developing device, in which the electrostatic image upon the copy paper 1 is developed. Thereafter, the copy paper 1 is directed toward the pair of squeezing and delivery rollers 21 and 41 and fixed and dried upon the guide plate 18 by the heated air delivered from the fan 20. Thereafter, the copy paper having a visible image is discharged out of the photocopying machine through the pair of delivery rollers 22 and 42.
  • Said one lateral side portion of the original 3 emanating between the relief portion 29 formed in the roller 11 and the auxiliary separating member 23 is directed toward the separating member having the curved side edge 24. ln a similar manner as described above, as the original 3 is advanced, it is separated from the copy paper 1 from the side of the auxiliary separating member 23 toward the opposite side transversely of the original by the curved side edge 24 and advanced along the separating member 26 which also serves as a guide plate toward the pair of delivery rollers 13 and 14, from which the original 3 is discharged out of the photocopying machine.
  • FIG. 6 illustrates another embodiment of the exposure device incorporated in the photocopying device according to the present invention.
  • the copy paper 1 is advanced while one side edge portion thereof is maintained in spaced-apart relation with the original 3 and is electrically charged by the charging devices 7 and 7' having the shield cases 71 and 71' surrounding the charging electrodes 70 and 70' having opposite polarities. Thereafter, the copy paper 1 is exposed by the lights transmitted through the exposure pressure plate 10" from the exposure device comprising an exposure light source 9 such as fluorescent lamp, a hood 90' covering the upper half of the light source 9' and a shield frame 19' for preventing propagation of light in undesired directions.
  • an exposure light source 9 such as fluorescent lamp
  • a hood 90' covering the upper half of the light source 9'
  • a shield frame 19' for preventing propagation of light in undesired directions.
  • the copy paper 1 is further electrically charged by a charging device 32 having a shield 30 which surrounds a charging electrode 31 as shown in FIG. 6.
  • a charging device 32 having a shield 30 which surrounds a charging electrode 31 as shown in FIG. 6.
  • an electrostatic latent image having a higher contrast as compared with that of the electrostatic latent image formed by thefirst embodiment of the present invention can be attained.
  • the copy paper is developed, fixed and discharged out of the photocopying machine.
  • a visible image having high contrast can be obtained.
  • the superposed copy paper 1 and the original 3 are advanced in the state in which they are attracted to each other electrostatically after having been uniformly charged by the charging devices 7 and 7 and the auxiliary separating member 23 is provided along one side of the passage of the copy paper and the original in such a manner that the auxiliary separating member 23 will not adversely affect the formation of an electrostatic latent image and so that the copy paper can be easily separated from the original prior to the next step.
  • edges of the separating members 26 and 27 are disposed at the end portion of the auxiliary member 23 in such a manner that said edges are in contact with the marginal portions of the copy paper and the original which are separated from each other by the auxiliary separating member 23, that is the portions between which are interposed the member 23. Therefore the leading edges of the copy paper and the original abut against the separating members 26 and 27 as the copy paper and the original are advanced and separated from each other transversely from the side of the auxiliary separating member 23 toward the opposite side.
  • the copy paper 1 is directed toward the developing device by the separating member 27 which serves as a guide for the copy paper while the original is directed toward the delivery rollers 13 and 14 through the separating member 26 which also serves as a guide.
  • the copy paper 1 can be separated from the original easily and positively. Furthermore, the separating device according to the present invention will not affect adversely the formation of an electrostatic latent image and will not require any further drive means, for example, individual separating rollers or air-suction mechanism.
  • the present invention has been so far with particular reference to a direct-contact-exposure-type electrophotographic photocopying machine, but it will be understood that the present invention can be also applied to a contact-reflection-exposure-type photocopying device and to an electrographic device of the type utilizing an electrostatic photocopying method in which a previously electrically charged copy paper is superposed upon an original and exposed, thereby forming an electrostatic image.
  • An electrophotographic copying device comprising:
  • guide means in said device for superposing an original atop a copy paper including a guide plate placeable between said su sed ori and b. pressure roller p aii l s suppor t ii rearufai c ii y a s;id guide plate and adapted to advance therebetween said superposed original and copy paper, opposed marginal portions of said rollers being of reduced diameter;
  • said separating means includes a first plate having an edge comprising a first portion secured to said strip member and a second portion tapering rearwardly of said strip member and a second plate having an edge disposed in contact with the undersurface of said strip member.
  • strip member is comprised of an electrically insulative resilient material.
  • said electrostatic image-forming means includes first and second plate members having opposed surfaces for receiving therebetween said superposed original and copy paper, opposed marginal portions of said plate member surfaces being recessed, said strip member extending between said recessed surfaces.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
US816568A 1968-04-25 1969-04-16 Electrophotographic copying device Expired - Lifetime US3612681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP43027916A JPS5134300B1 (de) 1968-04-25 1968-04-25

Publications (1)

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US3612681A true US3612681A (en) 1971-10-12

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US816568A Expired - Lifetime US3612681A (en) 1968-04-25 1969-04-16 Electrophotographic copying device

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US (1) US3612681A (de)
JP (1) JPS5134300B1 (de)
NL (1) NL6906441A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798029A (en) * 1971-07-27 1974-03-19 Sherwin Williams Co Laminated electrophotographic unit and process
FR2388309A1 (fr) * 1977-03-25 1978-11-17 Agfa Gevaert Ag Procede de reproduction electrographique et dispositif pour l'execution de ce procede
US5038177A (en) * 1988-12-15 1991-08-06 Xerox Corporation Selective pre-transfer corona transfer with light treatment for tri-level xerography

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022716A (en) * 1957-05-01 1962-02-27 Minnesota Mining & Mfg Photoprinting apparatus
US3498709A (en) * 1967-04-12 1970-03-03 Olivetti & Co Spa Desk top electrostatic copying machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022716A (en) * 1957-05-01 1962-02-27 Minnesota Mining & Mfg Photoprinting apparatus
US3498709A (en) * 1967-04-12 1970-03-03 Olivetti & Co Spa Desk top electrostatic copying machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798029A (en) * 1971-07-27 1974-03-19 Sherwin Williams Co Laminated electrophotographic unit and process
FR2388309A1 (fr) * 1977-03-25 1978-11-17 Agfa Gevaert Ag Procede de reproduction electrographique et dispositif pour l'execution de ce procede
US4210396A (en) * 1977-03-25 1980-07-01 Agfa-Gevaert, A.G. Electrophotographic method and apparatus
US5038177A (en) * 1988-12-15 1991-08-06 Xerox Corporation Selective pre-transfer corona transfer with light treatment for tri-level xerography

Also Published As

Publication number Publication date
NL6906441A (de) 1969-10-28
DE1920650A1 (de) 1969-12-04
DE1920650B2 (de) 1972-10-05
JPS5134300B1 (de) 1976-09-25

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