US3804401A - Pneumatic stripping apparatus - Google Patents

Pneumatic stripping apparatus Download PDF

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Publication number
US3804401A
US3804401A US00302364A US30236472A US3804401A US 3804401 A US3804401 A US 3804401A US 00302364 A US00302364 A US 00302364A US 30236472 A US30236472 A US 30236472A US 3804401 A US3804401 A US 3804401A
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US
United States
Prior art keywords
stripping
drum
air
stripping member
drum surface
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
US00302364A
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English (en)
Inventor
K Stange
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Priority to US00302364A priority Critical patent/US3804401A/en
Priority to CA177,731A priority patent/CA998705A/en
Priority to BR826673A priority patent/BR7308266D0/pt
Priority to JP48119373A priority patent/JPS49102350A/ja
Priority to GB4952573A priority patent/GB1427058A/en
Priority to IT3057173A priority patent/IT998964B/it
Priority to NL7314842A priority patent/NL7314842A/xx
Priority to DE19732354387 priority patent/DE2354387C3/de
Priority to FR7338663A priority patent/FR2204824B1/fr
Application granted granted Critical
Publication of US3804401A publication Critical patent/US3804401A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6532—Removing a copy sheet form a xerographic drum, band or plate
    • 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
    • Y10S271/90—Stripper

Definitions

  • ABSTRACT This invention relates to an apparatus for stripping [451 Apr. 16, 1974 copy sheets bearing developed electrostatic images from the surface of a photoreceptor drum member, in which the stripping member is supported on a cushion of air so as not to contact the drum surface during the stripping operation.
  • a stripping member is formed with a wedge portion member positioned adjacent to the drum surface to affect stripping of the paper from the drum surface.
  • a stripping member is formed with a plenum channel with the bottom thereof, and is in communication with a source of air that effects an air cushion formed between a stripping member and a drum surface. Air channels are formed at the leading edge of the stripping member to direct air in the vicinity of the leading edge of the copy sheet to facilitate lifting of the copy sheet off the drum surface.
  • air channels are formed in the face of the wedge portion to assist in separating the copy sheet from the drum surface after it has been initially stripped.
  • the stripping member is loaded against the photoreceptor drum member by a gimbal spring which allows the stripping member to maintain a constant relationship to the photoreceptor under conditions of whom or eccentricity of the photoreceptor while operating under dynamic conditions.
  • Thisinvention relates generally to xerographic copying apparatus and in particular to an improved stripping apparatus for stripping copy sheets having an electrostatic toner image transferred thereon from a moving drum surface.
  • a photoconductive surface in the form of a drum is uniformly charged and then exposed to a light image of an original to be reproduced. Under the influence of the light image the charge of the surface is selectively dissipated to produce what is known as a latent electrostatic image.
  • the charged latent image is developed, or made visible, by attracting oppositely charged toner particles, which are brought into close proximity to the drum surface.
  • the developed image is then transferred to a paper support material, which must then be separated or stripped from the drum surface which concerns the present invention.
  • the image is then affixed to the support material to form a permanent record of the original document.
  • the copy sheet is placed over the image bearing the photoconductive surface and the back side of the sheet subjected to a spray of ionized air.
  • a charge is built up on the sheet, having a magnitude and polarity sufficient to electrostatically attract the toner particles from the photoconductive surface onto the copy sheet.
  • One of the best and most widely known stripping devices is a mechanically air puffing device and as described, for example, in U.S. Pat. No. 3,062,536.
  • the copy sheet is stripped from the surface of the drum by introducing a jet of air between the copy sheet and the surface of the drum allowing the sheet to fall away from the photoconductive surface where it can be picked up by a transport belt or the like.
  • puffing devices are satisfactory they are not entirely reliable in operation as for example when puffing occurs too soon or too late.
  • stripping device is one or more mechanical stripping fingers which are actuated by an electrical signal brought into contact with the surface of the drum to contact the edge of the copy sheet and wedge the edge away from the photoconductive drum surface as described. for example in U.S. Pat. No. 3,578,859. While mechanical stripping fingers are satisfactory in one sense, they usually require frequent replacement and care must be exercised in the selection of the materials to prevent scratching or otherwise damaging the sensitive photoconductive drum surface.
  • the present invention is directed to a pneumatic stripping apparatus for removing copy sheets from a photoconductive surface and is accomplished generally speaking by a stripping member floating on a thin air cushion such that stripping is effected without contacting the drum surface. More than this the stripping apparatus may be used for stripping copy sheets from a moving fusing drum surface which is heated.
  • FIGS. 1(a) (c) illustrates the prior art stripping de vices showing different sequencing of an air blast, respectively;
  • FIG. 2 illustrates schematically a partial view of xerographic reproducing apparatus employing a preferred embodiment of the pneumatic stripping apparatus according to the present invention
  • FIG. 3 is a plan view of the stripping apparatus
  • FIG. 4 is an end view of the stripping apparatus
  • FIG. 5 is a partial side sectional view of an alternative embodiment of the pneumatic stripping apparatus illustrating certain detail thereof.
  • FIGS. 1(a) to) there is shown a prior art stripping system, which directs high pressure air through an array of jets 2 at a distance spaced from the photographic conductive drum toward copy sheet 4 carried on drum 6.
  • FIG. 1(a) when the air blast 6 occurs too soon, the energy is exhausted before the leading edge of sheet 4 arrives.
  • FIG. 1(b) the blast of air will actually push the copy sheet down toward the drum surface.
  • the jets are not capable of pushing all the air below the leading edge of the sheet as some of the air will always push the sheet down onto the drum surface.
  • more air than is needed is employed, which may cause turbulence in a machine and may cause toner on the copy sheet to shift.
  • FIG. 2 there is shown in schematic form a reproduction machine which incorporates the stripping apparatus of the invention generally designated 10.
  • image rays or an original to be copied are projected by means of an optical system exposing the photosensitive surface of a xerographic plate in the form of a drum generally designated by the reference numeral 16.
  • the drum surface continues, its movement of the electrostatic image passes through a development station at which development of the image takes place as by cascading developer material thereacross.
  • the developed electrostatic images passes a transfer station where a sheet of copy paper 22 is advanced at a speed in synchronism with the drum in order to accomplish transfer to the developed image.
  • a sheet transfer corotron 25 which effects electrostatic transfer of the developed image from the surface of the drum to the copy sheet.
  • a detack corotron 27 which is opposite in polarity to the transfer corotron 25 serves to neutralize the charge generated by transfer corotron 25 on the copy sheet.
  • the sheet is stripped from the drum by a pneumatic stripping apparatus 10 according to the present invention as will be described hereinafter.
  • the sheet is advanced to a conveyor such as a vacuum transport 30 which conveys the sheet to a fuser (not shown) where the developed image is permanently fixed to the sheet.
  • stripping apparatus can be used for stripping sheets from a fuser roll surface as well.
  • the foregoing brief description is deemed sufficient for an understanding of the copying steps of the machine and reference is made to foregoing patents for a more detailed description thereof.
  • the pneumatic stripping apparatus 20 which includes a stripping head member 33 which is formed with wedge portion 34 and contoured on the under side to conform to that of the drum surface and to define a plenum chamber as will become apparent.
  • Supporting the stripping head member is gimbal spring member 35 provides a normal force against the drum surface and enables the stripping head member to conform to the drum surface in the pitch and yaw directions under conditions of runout or eccentricity of the drum surface while operating under dynamic conditions.
  • a pair of lift rail members Positioned at the sides of the stripping head member are a pair of lift rail members which serve to guide and continue lifting the leading edge of the copying sheet after it is stripped from the drum surface by the stripping head member as will become more apparent.
  • Stripping head member 33 which may be made of any suitable material, such as, Bakelite aluminum with anodized hardcoating or ceramic, or mixture thereof, is maintained at a predetermined distance from the drum surface on a thin cushion of air.
  • an air conduit member 46 which is connected to a flexible conduit member 47 which in turn is connected to an air manifold 48 which is formed in the suspension arm 37.
  • the manifold 48 is connected to a suitable source-of air (not shown) which enables low pressurized air to be communicated to the stripping head member to effect an air cushion on the bottom thereof creating a floating stripping head member against the action of spring member 35.
  • the wedge portion 34 serves to strip the leading edge of the copy sheet which further acted on by air from grooves 49 to lift the sheet toward guide rails 45. Now it will be appreciated, that the copy is stripped from the drum surface reliably without contact of the stripping head member on the drum surface to prevent damage and/or wear.
  • FIG. 5 shows a second embodiment in which air escape conduits 51 are formed in wedge portion 34 to further enhance lift of the sheet from the drum surface.
  • Apparatus for stripping copy sheets bearing developed electrostatic images from a xerographic surface in the shape of a drum comprising;
  • said stripping member having a wedge portion positioned adjacent to the drum path and being formed with a plenum chamber on the bottom thereof,
  • air supply means to provide low pressurized air in communication with said plenum chamber to effect formation of an air cushion between said stripping member and the drum surface acting against said resilient mounting means to maintain a predetermined uniform spacing therebetween while the wedge portion strips the leading edge of each copy sheet from the drum surface without destroying the developed images on the copy sheets.
  • said wedge portion is formed with a plurality of conduits in communication with the air supply to exert an air force against the leading edge of each copy sheet as it is moved along the surface of the wedge portion.
  • Apparatus for stripping copy sheets bearing developed electrostatic images from a xerographic surface in the shape of a drum comprising;
  • said stripping member having a wedge portion positioned adjacent to the drum path and being formed with a plenum chamber on the bottom thereof,
  • said frame includes a gimbal spring to mainstroying the developed images on the copy sheets, tain constant relationship of stripping member and 5 drum surface for stripping subsequent copy sheet. wherein said frame is pivotally mounted for loading i

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
US00302364A 1972-10-30 1972-10-30 Pneumatic stripping apparatus Expired - Lifetime US3804401A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US00302364A US3804401A (en) 1972-10-30 1972-10-30 Pneumatic stripping apparatus
CA177,731A CA998705A (en) 1972-10-30 1973-07-31 Pneumatic stripping apparatus
JP48119373A JPS49102350A (enrdf_load_stackoverflow) 1972-10-30 1973-10-23
BR826673A BR7308266D0 (pt) 1972-10-30 1973-10-23 Aparelho aperfeicoado para remover folhas de copia contendo imagens eletrostaticas reveladas
GB4952573A GB1427058A (en) 1972-10-30 1973-10-24 Stripping apparatus
IT3057173A IT998964B (it) 1972-10-30 1973-10-25 Apparecchiatura per la separazione dei fogli particolarmente per macchine da stampa
NL7314842A NL7314842A (enrdf_load_stackoverflow) 1972-10-30 1973-10-29
DE19732354387 DE2354387C3 (de) 1972-10-30 1973-10-30 Abstreifvorrichtung zum Entfernen eines Blattes Kopierpapier von der Trommeloberfläche eines xerographischen Kopiergerätes
FR7338663A FR2204824B1 (enrdf_load_stackoverflow) 1972-10-30 1973-10-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00302364A US3804401A (en) 1972-10-30 1972-10-30 Pneumatic stripping apparatus

Publications (1)

Publication Number Publication Date
US3804401A true US3804401A (en) 1974-04-16

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ID=23167447

Family Applications (1)

Application Number Title Priority Date Filing Date
US00302364A Expired - Lifetime US3804401A (en) 1972-10-30 1972-10-30 Pneumatic stripping apparatus

Country Status (3)

Country Link
US (1) US3804401A (enrdf_load_stackoverflow)
JP (1) JPS49102350A (enrdf_load_stackoverflow)
CA (1) CA998705A (enrdf_load_stackoverflow)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885785A (en) * 1973-12-20 1975-05-27 Xerox Corp Vacuum transport
US3891206A (en) * 1973-07-02 1975-06-24 Xerox Corp Sheet stripping apparatus
US3936045A (en) * 1973-02-26 1976-02-03 Ricoh Co., Ltd. Sheet stripping device for copying apparatus
US3948507A (en) * 1974-11-25 1976-04-06 Xerox Corporation Copy stripper
US3955889A (en) * 1973-12-20 1976-05-11 Katsuragawa Denki Kabushiki Kaisha Apparatus for stripping receptor papers for use in electrophotographic machines
FR2300361A1 (fr) * 1975-02-10 1976-09-03 Xerox Corp Dispositif pour
US4009877A (en) * 1975-11-03 1977-03-01 International Business Machines Corporation Document transport device
US4026541A (en) * 1974-10-25 1977-05-31 Xerox Corporation Sheet stripping device
US4058306A (en) * 1976-05-24 1977-11-15 Xerox Corporation Detack and stripping system
US4092021A (en) * 1977-05-02 1978-05-30 Xerox Corporation Unfused image transport
US4097146A (en) * 1975-12-18 1978-06-27 Rank Xerox, Ltd. Original handling system and process
US4119307A (en) * 1977-06-20 1978-10-10 Xerox Corporation Sheet stripping apparatus
US4219270A (en) * 1979-08-29 1980-08-26 Xerox Corporation Reproducing apparatus
US4252307A (en) * 1978-06-28 1981-02-24 International Business Machines Corporation Sheet feed and transport
US4420152A (en) * 1979-02-02 1983-12-13 Olympus Optical Company Limited Apparatus for peeling or separating a record paper from a photosensitive drum of an electrophotographic copying machine
US4786046A (en) * 1986-03-15 1988-11-22 John Waddington Plc Handling of sheet materials
US4796880A (en) * 1986-12-29 1989-01-10 Eastman Kodak Company Skive with anti-gouge stiffener
US4806985A (en) * 1986-07-11 1989-02-21 Xerox Corporation Stripper fingers
US6254094B1 (en) * 1998-07-28 2001-07-03 Heidelberger Druckmaschinen Aktiengesellschaft Method and device for transferring a trailing edge of a sheet in a reversing device of a sheet-fed rotary printing machine
EP1291736A3 (en) * 2001-08-27 2003-04-23 Xerox Corporation Air knife for corrugating paper sheets
US20050156377A1 (en) * 2004-01-21 2005-07-21 Xerox Corporation Fuser sheet stripping system
US20080193176A1 (en) * 2007-02-13 2008-08-14 Xerox Corporation Air knife system with pressure sensor
US20100084804A1 (en) * 2008-10-06 2010-04-08 Xerox Corporation Systems and methods for controlling substrate flatness in printing devices using vacuum and/or the flow of air
US20100084809A1 (en) * 2008-10-06 2010-04-08 Xerox Corporation Systems and methods for controlling substrate flatness in printing devices using the flow of air
US20100201061A1 (en) * 2009-02-12 2010-08-12 Xerox Corporation Universal module for enabling measurements on color printers
US10124976B2 (en) * 2014-04-28 2018-11-13 Giesecke+Devrient Currency Technology Gmbh Stripping device
US11407605B2 (en) 2019-12-05 2022-08-09 Xerox Corporation Air-based photoreceptor sheet stripper

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5029046A (enrdf_load_stackoverflow) * 1973-07-17 1975-03-24
JPS6027028B2 (ja) * 1975-07-18 1985-06-26 キヤノン株式会社 転写装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595478A (en) * 1920-05-25 1926-08-10 Minton Ogden Method of stripping and feeding paper and apparatus
US3126200A (en) * 1960-07-30 1964-03-24 Separating device
US3396235A (en) * 1963-09-09 1968-08-06 Xerox Corp Xerographic facsimile printer having light scanning and electrical charging
US3428308A (en) * 1967-01-03 1969-02-18 Honeywell Inc Flexure-mounted magnetic pinch roll
US3578859A (en) * 1969-07-03 1971-05-18 Xerox Corp Mechanical stripping apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595478A (en) * 1920-05-25 1926-08-10 Minton Ogden Method of stripping and feeding paper and apparatus
US3126200A (en) * 1960-07-30 1964-03-24 Separating device
US3396235A (en) * 1963-09-09 1968-08-06 Xerox Corp Xerographic facsimile printer having light scanning and electrical charging
US3428308A (en) * 1967-01-03 1969-02-18 Honeywell Inc Flexure-mounted magnetic pinch roll
US3578859A (en) * 1969-07-03 1971-05-18 Xerox Corp Mechanical stripping apparatus

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936045A (en) * 1973-02-26 1976-02-03 Ricoh Co., Ltd. Sheet stripping device for copying apparatus
US3891206A (en) * 1973-07-02 1975-06-24 Xerox Corp Sheet stripping apparatus
US3955889A (en) * 1973-12-20 1976-05-11 Katsuragawa Denki Kabushiki Kaisha Apparatus for stripping receptor papers for use in electrophotographic machines
US3885785A (en) * 1973-12-20 1975-05-27 Xerox Corp Vacuum transport
US4026541A (en) * 1974-10-25 1977-05-31 Xerox Corporation Sheet stripping device
US3948507A (en) * 1974-11-25 1976-04-06 Xerox Corporation Copy stripper
FR2300361A1 (fr) * 1975-02-10 1976-09-03 Xerox Corp Dispositif pour
US3981085A (en) * 1975-02-10 1976-09-21 Xerox Corporation Air stripping device for elastomeric surface
US4009877A (en) * 1975-11-03 1977-03-01 International Business Machines Corporation Document transport device
US4097146A (en) * 1975-12-18 1978-06-27 Rank Xerox, Ltd. Original handling system and process
US4058306A (en) * 1976-05-24 1977-11-15 Xerox Corporation Detack and stripping system
US4092021A (en) * 1977-05-02 1978-05-30 Xerox Corporation Unfused image transport
US4119307A (en) * 1977-06-20 1978-10-10 Xerox Corporation Sheet stripping apparatus
US4252307A (en) * 1978-06-28 1981-02-24 International Business Machines Corporation Sheet feed and transport
US4420152A (en) * 1979-02-02 1983-12-13 Olympus Optical Company Limited Apparatus for peeling or separating a record paper from a photosensitive drum of an electrophotographic copying machine
US4219270A (en) * 1979-08-29 1980-08-26 Xerox Corporation Reproducing apparatus
US4786046A (en) * 1986-03-15 1988-11-22 John Waddington Plc Handling of sheet materials
US4806985A (en) * 1986-07-11 1989-02-21 Xerox Corporation Stripper fingers
US4796880A (en) * 1986-12-29 1989-01-10 Eastman Kodak Company Skive with anti-gouge stiffener
US6254094B1 (en) * 1998-07-28 2001-07-03 Heidelberger Druckmaschinen Aktiengesellschaft Method and device for transferring a trailing edge of a sheet in a reversing device of a sheet-fed rotary printing machine
EP1291736A3 (en) * 2001-08-27 2003-04-23 Xerox Corporation Air knife for corrugating paper sheets
US20050156377A1 (en) * 2004-01-21 2005-07-21 Xerox Corporation Fuser sheet stripping system
US7505723B2 (en) 2007-02-13 2009-03-17 Xerox Corporation Air knife system with pressure sensor
US20080193176A1 (en) * 2007-02-13 2008-08-14 Xerox Corporation Air knife system with pressure sensor
US20100084804A1 (en) * 2008-10-06 2010-04-08 Xerox Corporation Systems and methods for controlling substrate flatness in printing devices using vacuum and/or the flow of air
US20100084809A1 (en) * 2008-10-06 2010-04-08 Xerox Corporation Systems and methods for controlling substrate flatness in printing devices using the flow of air
US8186675B2 (en) 2008-10-06 2012-05-29 Xerox Corporation Systems and methods for controlling substrate flatness in printing devices using vacuum and/or the flow of air
US8752831B2 (en) 2008-10-06 2014-06-17 Xerox Corporation Systems and methods for controlling substrate flatness in printing devices using the flow of air
US20100201061A1 (en) * 2009-02-12 2010-08-12 Xerox Corporation Universal module for enabling measurements on color printers
US7957657B2 (en) * 2009-02-12 2011-06-07 Xerox Corporation Universal module for enabling measurements on color printers
US10124976B2 (en) * 2014-04-28 2018-11-13 Giesecke+Devrient Currency Technology Gmbh Stripping device
US11407605B2 (en) 2019-12-05 2022-08-09 Xerox Corporation Air-based photoreceptor sheet stripper

Also Published As

Publication number Publication date
CA998705A (en) 1976-10-19
JPS49102350A (enrdf_load_stackoverflow) 1974-09-27

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