US3827799A - Device for preventing development of non-image marginal portions of a photoreceptor in electrophotographic copying apparatus - Google Patents

Device for preventing development of non-image marginal portions of a photoreceptor in electrophotographic copying apparatus Download PDF

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Publication number
US3827799A
US3827799A US00348228A US34822873A US3827799A US 3827799 A US3827799 A US 3827799A US 00348228 A US00348228 A US 00348228A US 34822873 A US34822873 A US 34822873A US 3827799 A US3827799 A US 3827799A
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United States
Prior art keywords
photoreceptor
exposing
original
charging
marginal portions
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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
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US00348228A
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English (en)
Inventor
Y Koizumi
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Ricoh Co Ltd
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Ricoh Co Ltd
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Publication date
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Publication of US3827799A publication Critical patent/US3827799A/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
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/045—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas
    • G03G15/047—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas for discharging non-image areas
    • 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
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0275—Arrangements for controlling the area of the photoconductor to be charged
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0434—Parameters defining the non-image area to be cleaned
    • G03G2215/0436—Document properties at the scanning position, e.g. position and density
    • G03G2215/0441—Manual input of properties
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0448—Charge-erasing means for the non-image area
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0448—Charge-erasing means for the non-image area
    • G03G2215/046—Charger

Definitions

  • ABSTRACT In an electrophotographic copying apparatus, a device for preventing the charging device from charging selected marginal portions of a photoreceptor, to thereby prevent staining of these selected marginal portions when the charged part of the photoreceptor is exposed to the image of an original, and this image is later developed. Charging of the selected marginal portions of the photoreceptor is prevented by means of plates which are moved with respect to the charging device by manually moving indicators disposed along the length and width of the rest plate that supports an original for copying. Thus, only that portion of the photoreceptor which corresponds to the selected size of the original is charged, while the marginal portions of the photoreceptor which would surround the projected image of the original are not charged.
  • the invention relates to a device for preventing staining of marginal portions of a photoreceptor in an electrophotographic copying apparatus.
  • An object of the invention is to provide a device which prevents staining of marginal portions of a photoreceptor and thus obviates the need to retouch a photoreceptor after it has been charged and exposed to an image of an original.
  • This object is accomplished by providing charge preventing plates which are movably disposed adjacent the charging device of an electrophotographing copying apparatus and can prevent charging of marginal portions of the photoreceptor on which portions no image of the original is projected.
  • the copying apparatus is provided with a width indicator mounted for sliding movement along an edge of theoriginal rest glass plate of the apparatus, and the width indicator is linked with a pair of charge preventing plates whose position with respect to the width of the photoreceptor can be adjusted by manually moving the width indicator.
  • a length indicator is provided along another edge of the original rest glass plate, and is linked with a light intercepting plate provided at least at one of the two longitudinal ends of the exposing device of the copying machine.
  • the light intercepting plate is provided with a light source for illuminating a marginal area of the photoreceptor on which no image of the original is projected, so that the charge carried by such marginal area can be removed.
  • the longitudinal portion of the photoreceptor on which an image will be projected may thus be selected by manually moving the length indicator along the orignal rest glass plate.
  • FIG. 1 is a perspective view of an electrophotographic copying apparatus incorporating the. invented device for preventing staining of marginal portions of a photoreceptor.
  • FIG. 2 is a perspective partial view of a charging device forming apart of the apparatusshown in FIG. 1.
  • FIG. 1 a book 2 is placed on an original rest glass plate 1 of an electrophotographing copying apparatus.
  • the apparatus includes a charging device 3, an exposing device 4 and a developing device 5 which are disposed along the same horizontal plane in the indicated order.
  • a lens system 7 is interposed between the original glass plate 1 and the exposing device 4.
  • a photoreceptor 8 is suitably fed in the indicated direction.
  • the charging device 3 includes a pair of charge preventing plates 9 and 9A each disposed at one of the transverse ends of the charging device 3-for sliding movement in a direction transverse to the direction of movement of the photoreceptor 8a
  • the plates 9 and 9A are urged inwardly, toward each other, by means of return springs 10 and 10A respectively.
  • the original rest glass plate 1 is graduated at its edge 11, and two indicators 12 and 12Aare suitably mounted along the edge 11 so that they can be manually moved slidably therealong.
  • Thev indicator l2 and 12A are linked with the charge preventing plates 9 and 9A respectively through respective strings l8 and 18A and suitable pulleys. The link is such that when the indicators l2 and 12A are moved along the graduations at the edge 11 of the original rest glass plate 1, the charge preventing plate 9 and 9A move under or against the biasing force of the spring 10 and 10A toward or away from each other.
  • Each of the charge preventing plates 9 and 9A may thus be moved independently.
  • an upstanding light intercepting plate 14 is disposed at the longitudinal end of the exposing device 4 which is adjacent the charging device 3.
  • the light intercepting plate 14 includes an upper marginal portion 14A which is bent horizontally to point towards the charging device 3.
  • An electric lamp 16 is suitably secured to the side of the intercepting plate 14 which faces the charging device 3 and is disposed below the. horizontally bent upper marginal portion 14A.
  • the original rest glass plate 1 is provided with a length indicator 18 mounted along an edge of the plate 1 which is transverse to the edge 11.
  • the length indicator 18 is linked with the plate 14 by means of a string. 19 and suitable 3 pulleys, and a spring 17 is provided to urge the plate '14 toward the charging device 3.
  • the invented device operates as follows: When an original 2 is placed over the original rest glass plate 1, as shown in: FIG. 1, the width indicators 12 and 12A are manually moved to indicate the desired width of the original. The manual movement of the width indicators 12 and 12A moves, through the strings 13 and 13A respectively, the chargepreventing plates and 10A respectively, such that the distance between the charge preventing plates 10 and 10A corresponds to the distance between the indicators 12 and 12A and hence to the desired width of the original 2.
  • the length indicator 18 is manually moved to indicate the desired length of the original 2. As the length indicator is moved, the light intercepting plate 14 moves correspondingly, because of the link through the string 19, to a selected position with respect to the exposing station 4.
  • a photoreceptor 8 is then moved, by conventional means, in the indicated direction such that its side marginal portions are between the charging device 3 and 'the charge preventing plates 9 and 9A.
  • the portions thereof which are between the charge preventing plates 9 and 9A are electrically charged in the conventional manner, while the side marginal portions which are above the charge preventing plates 9 and 9A are not so charged.
  • the photoreceptor 8 moves into the exposing device 4 and is conventionally stopped at an exposing position by suitable means including a microswitch for detecting the proper exposing position of the photoreceptor 8.
  • the photoreceptor 8 After the photoreceptor 8 is in its exposing position, it is exposed to an optical image of the original 2 by conventional means to thereby form on the photoreceptor 8 an electrostatic latent image of the original 2. At the same time, or immediately after the photoreceptor 8 is exposed to the image of the original, the lamp 16 is turned on by suitable means, such as by the closing of the microswitch 20, to thereby illuminate the bottom marginal portion of the photoreceptor 8 and to remove the charge therefrom.
  • intercepting plate 14 may be disposed at the end of the exposing device 4 which is away from the charging device 3, such that it can selectively illuminate a top marginal portion of a photoreceptor 8 which is at the exposing position. It should also be clear that similar intercepting plates 14 may be disposed at each of the two longitudinal ends of the exposing station 4, such that both the top and the bottom margins of a photoreceptor 8 may be illuminated.
  • a second length indicator similar to the shown length indicator 18, may be provided and may be linked with the second intercepting plate 14 in a manner similar to the manner in which the length indicator 18 is linked to the shown intercepting plate 14.
  • the arrangement of two length indicators 18 may be similar to the arrangement of the shown width indicators 12 and 12A.
  • the photoreceptor After the photoreceptor is exposed as aforementioned, it is conventionally moved through a developing device 5, and a fixing device 6 before being discharged from the copying apparatus. Since the selected marginal portions of thephotoreceptor 8 are not electrically charged, they are not stained by toner particles or otherwise in the course of developing the image projected thereon.
  • the invented device is useful for preventing staining of selected marginal portions of a photoreceptor in electrophotographic copying apparatus both of the dry developing type and of the wet developing type. It obviates the prior art need for retouching duplicates, and provides duplicates which are commercially acceptable and have pleasing appearance. The waste of developing agent which is associated with prior art methods is minimized. Additionally, the invented device is beneficial to the operator of a copying machine and to the general appearance of the premises of a copying machine because it prevents scattering of toner particles occasioned by retouching.
  • the invented device eliminates the use of such white frames on such occassions, and speeds up multiple exposure or multiple transfer printing processes.
  • a device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographic copying apparatus including means for charing a photoreceptor moving along a defined path with respect to the charging means, said device comprising a plurality of charge preventing plates and means for se lectively positioning said plates at the side margins transversely of said path to prevent charging of selected side marginal portions of the photoreceptor by the charging means and to thereby define the width of the charged area of the photoreceptor, an original rest plate for supporting an original for copying, width indicator means, means for mounting the width indicator means for sliding movement along one edge of the rest plate transverse to said defined path to indicate the desired width of an original placed on the plate, means for supporting the charge preventing plates for sliding transverse movement with respect to the charging means, and means for linking the indicator means with the charge preventing plates for corresponding movement thereof when the width indicator means are manually moved to indicate the desired width of an original.
  • the photocopying machine includes an exposing station having an exposing position along the path of the photoreceptor downstream from the charging means and means for projecting an image of an original supported on said rest plate onto a photoreceptor at an exposing position at said exposing station, said device comprising, at least at one of the longitudinal ends of the exposing station along the path of the photoreceptor, a light intercepting plate extending transversely to the path of the photoreceptor and having a light source on the side facing away from the exposing station to illuminate a selected margin at a longitudinal end of a photoreceptor in the exposing position, whereby the light source may be selectively turned on to illuminate and thereby discharge a selected charge marginal portion at a longitudinal end of a photoreceptor.
  • a device as in claim 2 including means for supporting the light intercepting plate for longitudinal movement toward and away from the exposing station, length indicator means, means for mounting the length indicator means for sliding movement along a longitudinal edge of the rest plate to indicate the desired length of an original placed on the plate, and means for linking the length indicator means with the support means for the light intercepting plate for corresponding movement of the light intercepting plate when the length indicator means are moved manually to indicate the desired length of an original.
  • a device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographying copying apparatus including means for charging a photoreceptor moving along a defined path with respect to the charging means, said device comprising a plurality of charge preventing plates and means for selectively positioning said plates at the side margins transversely of said path to prevent charging of selected side marginal portions of the photoreceptor by the charging means and to thereby define the width of the charged area of the photoreceptor, said machine further including an exposing station having an exposing position along the path of a photoreceptor downwstream from the charging means, and means for projecting an image of an original onto a photoreceptor at an exposing position at said exposing station, said device further comprising means for selectively discharging a marginal portion at least at one of the longitudinal ends of a photoreceptor at the exposing position including a light source and a light intercepting plate blocking the light therefrom and preventing it from reaching a selected central portion of the photoreceptor at the exposing position,
  • a device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographic copying apparatus having means for charging a photoreceptor moving along a defined path with respect to the charging means, an original rest plate for supporting an original placed thereon for copying and exposing means having an exposing station located downstream from the charging means along the path of the photoreceptor for projecting an image of an original placed on the rest plate for copying onto a photoreceptor disposed at an exposing position at said exposing station, said device comprising moveable means disposed adjacent the charging means for selectively preventing the charging of selected side marginal portions of a photoreceptor moving towards the exposing means and means located at least at one of the longitudinal ends of the exposing means for discharging selected marginal portions at least at one of the longitudinal ends of a photoreceptor disposed at the exposing position, a width indicator visible from outside the copying apparatus and mounted for sliding movement along an edge of the rest plate transverse to said defined path and a length indicator visible from outside the copying apparatus and mounted for sliding movement

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Holders For Sensitive Materials And Originals (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Rotary Presses (AREA)
US00348228A 1972-04-17 1973-04-05 Device for preventing development of non-image marginal portions of a photoreceptor in electrophotographic copying apparatus Expired - Lifetime US3827799A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47037745A JPS4912829A (enrdf_load_stackoverflow) 1972-04-17 1972-04-17

Publications (1)

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US3827799A true US3827799A (en) 1974-08-06

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US (1) US3827799A (enrdf_load_stackoverflow)
JP (1) JPS4912829A (enrdf_load_stackoverflow)
DE (1) DE2316387C3 (enrdf_load_stackoverflow)
GB (1) GB1369776A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2843975A1 (de) * 1977-10-08 1979-04-19 Canon Kk Kopiergeraet mit wahlweise einstellbarer vorlagengrundlinie
US4255042A (en) * 1979-03-26 1981-03-10 International Business Machines Corporation Light pipe for accurate erasure of photoconductor charge
US4320956A (en) * 1979-03-12 1982-03-23 Olympus Optical Company Ltd. Electrophotographic apparatus including a screen member for decreasing side edge electrostatic charge
US4593989A (en) * 1983-06-10 1986-06-10 Sharp Kabushiki Kaisha Charge removing device for an electrophotographic copying machine
US4653899A (en) * 1985-02-06 1987-03-31 Kabushiki Kaisha Toshiba Image forming apparatus with area selection and preservation functions
US4666288A (en) * 1985-01-18 1987-05-19 Kabushiki Kaisha Toshiba Image forming apparatus with area selection and confirmation
US4708464A (en) * 1985-01-30 1987-11-24 Minolta Camera Kabushiki Kaisha Device for erasing unnecessary images for use in reader-printers
US4774593A (en) * 1985-04-19 1988-09-27 Sanyo Electric Co., Ltd. Image forming apparatus
US5521675A (en) * 1995-06-28 1996-05-28 Xerox Corporation Annotation system occluding device for an electrophotographic printing apparatus
US5987299A (en) * 1995-10-09 1999-11-16 Oce Printing Systems Gmbh Electrographic printer with adjustable corona device

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5820032B2 (ja) * 1974-07-06 1983-04-21 株式会社リコー センコウロコウガタセイデンフクシヤキニオケル ゲンゾウハンイゲンテイソウチ
JPS5172044U (enrdf_load_stackoverflow) * 1974-12-04 1976-06-07
CH607624A5 (en) * 1976-05-14 1978-09-29 Walter Spengler Printer with electrostatic printing ink transfer onto a dielectric substrate
JPS5312334A (en) * 1976-07-20 1978-02-03 Oki Electric Ind Co Ltd Light beam printer
JPS6051709B2 (ja) * 1976-07-23 1985-11-15 沖電気工業株式会社 光ビ−ムプリンタ
JPS5913633Y2 (ja) * 1977-06-30 1984-04-23 株式会社リコー 変倍複写用帯電チャ−ジャ−
JPS5469438A (en) * 1977-11-14 1979-06-04 Ricoh Co Ltd Electrophotographic apparatus
JPS565098Y2 (enrdf_load_stackoverflow) * 1977-12-24 1981-02-04
JPS5494038A (en) * 1978-01-07 1979-07-25 Ricoh Co Ltd Copier for zerography
US4431301A (en) * 1980-03-12 1984-02-14 Tokyo Shibaura Denki Kabushiki Kaisha Electrostatic copying apparatus with means for preventing contamination of reverse side of copying medium
JPS56146155A (en) * 1980-04-15 1981-11-13 Mita Ind Co Ltd Electrostatic copying machine
JPS5793942U (enrdf_load_stackoverflow) * 1980-11-28 1982-06-09
JPS57105638U (enrdf_load_stackoverflow) * 1980-12-18 1982-06-29
JPS57163253A (en) * 1981-04-01 1982-10-07 Sharp Corp Electrophotographic copier
JPS57160148U (enrdf_load_stackoverflow) * 1981-04-01 1982-10-07
JPS57163254A (en) * 1981-04-01 1982-10-07 Sharp Corp Electrophotographic copier

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556655A (en) * 1968-01-22 1971-01-19 Addressograph Multigraph Photoelectrostatic copying machine
US3578970A (en) * 1968-05-03 1971-05-18 Plastic Coating Corp Variable width corona discharge apparatus with means to shield or vary a predetermined length of a corona discharge wire
US3603851A (en) * 1968-11-11 1971-09-07 Commw Of Australia Method of contour charging
US3656851A (en) * 1969-03-10 1972-04-18 Iwatsu Electric Co Ltd Copying apparatus
US3671121A (en) * 1970-08-05 1972-06-20 Eastman Kodak Co Exposure device for controlling charge on a portion of a charged surface bordering an image frame projected on the charged surface
US3685895A (en) * 1970-05-18 1972-08-22 Opto Graphics Inc Electrophotographic charging easel
US3724940A (en) * 1970-12-07 1973-04-03 Ricoh Kk Electrophotographic copying apparatus with means for erasing marginal images
US3751155A (en) * 1971-12-30 1973-08-07 Xerox Corp Pre-development exposure assembly

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556655A (en) * 1968-01-22 1971-01-19 Addressograph Multigraph Photoelectrostatic copying machine
US3578970A (en) * 1968-05-03 1971-05-18 Plastic Coating Corp Variable width corona discharge apparatus with means to shield or vary a predetermined length of a corona discharge wire
US3603851A (en) * 1968-11-11 1971-09-07 Commw Of Australia Method of contour charging
US3656851A (en) * 1969-03-10 1972-04-18 Iwatsu Electric Co Ltd Copying apparatus
US3685895A (en) * 1970-05-18 1972-08-22 Opto Graphics Inc Electrophotographic charging easel
US3671121A (en) * 1970-08-05 1972-06-20 Eastman Kodak Co Exposure device for controlling charge on a portion of a charged surface bordering an image frame projected on the charged surface
US3724940A (en) * 1970-12-07 1973-04-03 Ricoh Kk Electrophotographic copying apparatus with means for erasing marginal images
US3751155A (en) * 1971-12-30 1973-08-07 Xerox Corp Pre-development exposure assembly

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2843975A1 (de) * 1977-10-08 1979-04-19 Canon Kk Kopiergeraet mit wahlweise einstellbarer vorlagengrundlinie
US4256400A (en) * 1977-10-08 1981-03-17 Canon Kabushiki Kaisha Copying machine provided with means for selectively setting original base line
US4320956A (en) * 1979-03-12 1982-03-23 Olympus Optical Company Ltd. Electrophotographic apparatus including a screen member for decreasing side edge electrostatic charge
US4255042A (en) * 1979-03-26 1981-03-10 International Business Machines Corporation Light pipe for accurate erasure of photoconductor charge
US4593989A (en) * 1983-06-10 1986-06-10 Sharp Kabushiki Kaisha Charge removing device for an electrophotographic copying machine
US4666288A (en) * 1985-01-18 1987-05-19 Kabushiki Kaisha Toshiba Image forming apparatus with area selection and confirmation
US4708464A (en) * 1985-01-30 1987-11-24 Minolta Camera Kabushiki Kaisha Device for erasing unnecessary images for use in reader-printers
US4653899A (en) * 1985-02-06 1987-03-31 Kabushiki Kaisha Toshiba Image forming apparatus with area selection and preservation functions
US4774593A (en) * 1985-04-19 1988-09-27 Sanyo Electric Co., Ltd. Image forming apparatus
US5521675A (en) * 1995-06-28 1996-05-28 Xerox Corporation Annotation system occluding device for an electrophotographic printing apparatus
US5987299A (en) * 1995-10-09 1999-11-16 Oce Printing Systems Gmbh Electrographic printer with adjustable corona device

Also Published As

Publication number Publication date
JPS4912829A (enrdf_load_stackoverflow) 1974-02-04
DE2316387B2 (de) 1975-04-17
DE2316387A1 (de) 1973-10-25
DE2316387C3 (de) 1975-11-27
GB1369776A (en) 1974-10-09

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JPS5826012B2 (ja) 原稿移動型電子複写機