US3850519A - Xerographic image transfer apparatus - Google Patents

Xerographic image transfer apparatus Download PDF

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Publication number
US3850519A
US3850519A US00323159A US32315973A US3850519A US 3850519 A US3850519 A US 3850519A US 00323159 A US00323159 A US 00323159A US 32315973 A US32315973 A US 32315973A US 3850519 A US3850519 A US 3850519A
Authority
US
United States
Prior art keywords
plate
baffle
sheet
generator
corona
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
US00323159A
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English (en)
Inventor
D Weikel
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 US00323159A priority Critical patent/US3850519A/en
Priority to DE2359331A priority patent/DE2359331C3/de
Priority to NL7400085.A priority patent/NL161900C/xx
Priority to IT19179/74A priority patent/IT1006786B/it
Priority to SE7400197A priority patent/SE387755B/xx
Priority to BE139676A priority patent/BE809579A/xx
Priority to GB104174A priority patent/GB1446252A/en
Priority to BR74129A priority patent/BR7400129D0/pt
Priority to AR251876A priority patent/AR202116A1/es
Priority to CA190,003A priority patent/CA1033616A/en
Priority to CH38974A priority patent/CH567748A5/xx
Priority to AU64446/74A priority patent/AU6444674A/en
Priority to FR7400908A priority patent/FR2324034A1/fr
Priority to SU741986065A priority patent/SU676191A3/ru
Priority to ES422230A priority patent/ES422230A1/es
Priority to JP49006966A priority patent/JPS5836336B2/ja
Application granted granted Critical
Publication of US3850519A publication Critical patent/US3850519A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/163—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap
    • G03G15/1635—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap the field being produced by laying down an electrostatic charge behind the base or the recording member, e.g. by a corona device
    • G03G15/165—Arrangements for supporting or transporting the second base in the transfer area, e.g. guides

Definitions

  • the shield which is made up of a grounded plate having a thin dielectric coating thereover, is positioned within the generator ion stream to prevent the charged ions from reaching the support material prior to its being placed in contact with the photoconductive plate.
  • This device is particularly well suited to prevent premature transfer of toner images in a machine environment wherein a xerographic drum having a relatively small diameter is utilized.
  • This invention relates to apparatus for electrically transferring a xerographic toner image from an intermediate support surface onto a sheet of final support material.
  • this invention relates to apparatus for electrically transferring the xerographic toner images from a xerographic drum having a relatively small diameter onto a substantially fiat sheet of final support material.
  • a latent electrostatic image of an original to be reproduced is created upon a photoconductive plate and the latent image then developed or made visible by applying thereto a specially prepared, oppositely charged finely divided toner material.
  • the fine toner particles when brought into close proximity with the latent image force field, are captured by the force field and held on the plate in image configuration thus rendering the latent image visible.
  • a sheet of plain copy paper, or any other similar suitable support material having insulating properties is placed in overlying contact with the image bearing plate surface and the charged toner particles are electrically transferred from the plate to the copy sheet.
  • image transfer is accomplished by spraying the back side of the copy sheet with a corona discharge having a polarity opposite that of the charged toner while the sheet is in contact with the plate surface.
  • Sufficient corona is deposited upon the sheet to electrically couple the sheet to the grounded xerographic plate. A force field acting normal to the sheet is thus created between the two contacting bodies which causes the toner particles to be electrically transferred from the plate to the copy sheet.
  • this type of image distress can be avoided by properly positioning the corona generator in respect to the contact region whereby the corona stream is applied to the sheet well after contact is established.
  • This particular arrangement calls for a relatively long contact zone being greater than the width of the corona stream, or extremely accurate positioning of the generator.
  • a still further object of the present invention is to prevent premature charging of a copy sheet as the sheet is entering a xerographic transfer station.
  • Yet another object of the present invention is to efficiently transfer xerographic toner images in a machine environment wherein the contact region between a receiving copy sheet and an image bearing xerographic plate is more, confined than the corona stream utilized to effect transfer.
  • an image transfer device comprised of a sheet feeding apparatus ananged to bring a sheet of final support material into overlying contact with a moving xerographic plate, a corona generator mounted in close proximity to the plate surface adjacent to the region where the sheet of final support material contacts the plate, the generator being adapted to spray the back side of the sheet with a corona discharge to effect an electrical transfer of the toner images from the plate onto the sheet, and a grounded conductive baffle having a dielectric coating thereon mounted between the corona generator and the plate surface with the baffle extending into the corona stream and being positioned to prevent the stream from reaching the copy sheet prior to the sheet contacting the image bearing plate.
  • FIG. 1 illustrates the image transfer apparatus of the present invention embodied in an automatic xerographic machine employing a reusable photoreceptor in the form of a relatively small diameter drum;
  • FIG. 2 is an enlarged partial view of the baffle used to prevent premature charging of the copy sheet.
  • a relatively small diameter image recording drum l1 suitable for use in an automatic xerographic copier is arranged to rotate in the direction indicated about a horizontal support shaft 12 to transport the drum through a series of xerographic processing stations.
  • the drum is comprised of a grounded substrate 13 over which is coated a photoconductive layer 14, such as selenium or the like.
  • the photoconductive surface is conventionally charged initially to a given positive potential and then exposed to a lightimage of the original to be copied thereby recording the image infonnation on the photoreceptor in the form of a latent electrostatic image.
  • the latent image is next passed through a xerographic development station 15 wherein the latent image information is rendered visible by applying oppositely or negatively charged toner particles to the image areas.
  • the toner image bearing drum surface is then transported through an image transfer station 10 wherein the image is transferred to a sheet of final support material in the manner described in greater detail below.
  • cut sheets of final support material 17 are forwarded through the transfer station in synchronous timed relation with the developed images transported therethrough upon xerographic drum surface.
  • a sheet forwarding mechanism 19 made up of a pair of cooperating advancing rolls 20, 21.
  • the sheet of support material is normally separated from a supply stack (not shown) and properly registered with the moving drum surface prior to its being brought into the nip of the advancing roll assembly. The sheet is brought into the nip in engagement between the rolls and advanced at drum speed towards the transfer station.
  • a guide plate 24 is positioned at the outlet side of the advancing roll assembly and serves to direct the moving sheet into the image transfer station.
  • the first generator 30, in the direction of drum rotation, is a transfer generator which is herein employed to electrically transfer the toner particles from the drum surface to the copy sheet.
  • the second generator, 31, is a sheet detacking generator which serves to reduce or neutralize any electrical forces generated during transfer which may tend to hold copy sheets onto the drum surface and thus effect the release of the sheets from the photoreceptor.
  • this discharge device is formed of a U-shaped conductive shield 31 which extends longitudinally along the entire photoconductive drum surface.
  • the open end of the U-shaped grounded shield 32 is arranged to face the drum surface adjacent to the region wherein the copy sheet is advanced into contact with the photoreceptor.
  • a corona generating wire 33 which'is electrically connected to a DC source of power 34.
  • an electrical potential is placed upon the wire which causes the wire to emit a positive stream of corona through the shield opening onto the back side of the copy sheet-
  • the grounded generator shield 32 acts as an electrical control in the generating system and also serves to focus a uniform stream of corona towards the copy sheet.
  • the wire to shield spacing and the generator shield opening are related, among other things, to the power available to excite the wire.
  • a corona device having a wire of about 0.0035 inches in diameter which has an input of about 8000 volts DC requires a shield opening of about 0.500 inches when operating under optimum conditions.
  • the generator opening is made more restrictive the power requirements of the generating system will increase drastically. In fact, a point is soon reached where the power requirements become prohibited in that the electrical demands will exceed the power available in most copyingmachines.
  • the apparatus of the present invention is provided with a control baffle 40 which is capable of both physically and electrically shielding the copy sheet from the corona stream until such time as the copy sheet is well seated in contact with the xerographic plate surface.
  • the baffle forms a guide for directing the copy sheet into contact with the plate surface prior to its being exposed to the corona stream emitted by the generator 30.
  • the baffle 40 is positioned adjacent to the drum surface in close proximity therewith so that the sheet of final support material, which is forwarded into the image transfer station by the advancing roll members, is guided into tangential moving contact with the moving photoreceptor surface prior to the sheets entering the corona stream.
  • the baffle is comprised of an elongated body 41, pivotably mounted at one end upon pivot pin 42, and an extended arm 43 which projects horizontally between the generator shield and the photoreceptor surface.
  • the location of the baffle is controlled by means of a locating pin 45 against which boss 46 on the baffle rests.
  • the extended arm 43 is physically positioned in the corona stream emitted by generator 30 and physically shields a portion of the plate from the corona stream.
  • the upper surface of the bafile is provided with an upwardly protruding surface 48 which is arranged to engage the bottom surface of a copy sheet forwarded into the transfer station.
  • the surface is adapted to direct the copy sheet moved thereover upwardly into contact with the photoconductive plate with the region shielded from the corona stream by arm 43 thus assuring that the sheet is well seated against the drum prior to being exposed to the transfer stream.
  • the baffle is made up of a conductive metal substrate 49 that is coated with a thin layer of dielectric material 50.
  • the dielectric coating is sufficiently thin whereby the electrostatic charge directed thereupon by the transfer generator is felt internally by the substrate.
  • the substrate is grounded and thus is capable of acting as a control device, in respect to the generator, to limit the amount of charge that will be accepted upon the dielectric coating.
  • a predetermined amount of corona is accepted upon the baffle.
  • any further corona directed at the baffle is repelled therefrom by the electrostatic field established thereon by the previously deposited corona.
  • the apparatus of the present invention was employed in an automatic xerographic system which included a xerographic drum having a diameter of about 3.3 inches.
  • the contact zone between the copy sheet and the photoconductive surface varied from between oneeighth of an inch and three-sixteenths of an inch depending upon the weight of the support sheet in process.
  • a corona generator similar to that disclosed by Vyverberg was positioned adjacent to the contact zone to accomplish a conventional electrical image transfer of flow images from the plate to the copy sheet. Initially the plate was charged to a positive potential of approximately 800 volts and the initial potential reduced in the background areas during exposure to a value of about 300 volts. The image was developed with a negatively charged toner material and transfer accomplished by means of a single wire generator consisting of a 3 mil.
  • tungsten wire positioned about 0.250 inches above the photoreceptor surface adjusted to draw approximately -l40 micro-amps DC bare plate current.
  • the generator was positioned within a grounded shield having a onehalf inch opening opposite the contact zone.
  • a baffle similar to the one herein described was positioned at about 0.080 inches from the drum surface and brought under the shield so as to extend into the corona stream.
  • the baffle was fabricated of a conductive metal substrate having a 0.003 to 0.005 inch coating of a dielectric material which was sprayed over the metal substrate. The baffle acted both as a physical and an electrical barrier to the corona stream to prevent premature charging of the copy sheet and eliminated image distress.
  • the baffle substrate is placed at a ground potential in the present embodiment, it is within the scope of the present invention to bias the substrate to some potential other than ground without departing from the teachings of the present invention.
  • the initial surge current that flows from the corona generator to the baffle can be minimized and the dielectric strength requirements of the baffle coating material can be considerably relaxed. It should be clear, however, that this bias voltage should be insufficient, by itself, to initiate premature transfer of the toner material carried on the xerographic plate surface.
  • an image transfer apparatus including:
  • said transferring means including a corona generator for generating a corona stream comprising corona discharge means extending across said plate and a shield'partially enclosing said discharge means and having an opening facing said plate;
  • baffle positioned between said plate and said generator, said baffle including means for guiding said sheet into contact with said. plate prior to said sheet being exposed to said corona stream, a portion of said baffle extending partially between said opening and said plate.
  • baffle is comprised of a conductive material which is placed at a ground potential.
  • baffle includes a conductive substrate biased to a potential between ground potential and the operating potential of the generator to minimize current flow therebetween.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
US00323159A 1973-01-12 1973-01-12 Xerographic image transfer apparatus Expired - Lifetime US3850519A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
US00323159A US3850519A (en) 1973-01-12 1973-01-12 Xerographic image transfer apparatus
DE2359331A DE2359331C3 (de) 1973-01-12 1973-11-28 Einrichtung zur elektrostatischen Übertragung eines auf einem elektrofotographischen Aufzeichnungsmaterial befindlichen Tonerbildes auf ein Bildempfangsmaterial im Durchlaufverfahren
NL7400085.A NL161900C (nl) 1973-01-12 1974-01-03 Elektrofotografische beeldoverdrachtsinrichting.
IT19179/74A IT1006786B (it) 1973-01-12 1974-01-08 Apparecchiatura per il trasferimen to di immagini xerografiche
SE7400197A SE387755B (sv) 1973-01-12 1974-01-08 Bildoverforingsapparat
GB104174A GB1446252A (en) 1973-01-12 1974-01-09 Image transfer in an imaging apparatus
BE139676A BE809579A (fr) 1973-01-12 1974-01-09 Appareils de transfert d'image xerographique
AR251876A AR202116A1 (es) 1973-01-12 1974-01-10 Aparato para transferir electricamente una imagen de matizador electrostatografico desde una superficie de soporte intermedio hacia una hoja de material de soporte final
BR74129A BR7400129D0 (pt) 1973-01-12 1974-01-10 Mecanismo para transferencia de imagem, aparelho para impedir transferencia prematura das imagens carregadas
CA190,003A CA1033616A (en) 1973-01-12 1974-01-11 Electrostatographic image transfer apparatus
CH38974A CH567748A5 (cs) 1973-01-12 1974-01-11
AU64446/74A AU6444674A (en) 1973-01-12 1974-01-11 Image transfer apparatus
FR7400908A FR2324034A1 (fr) 1973-01-12 1974-01-11 Appareils de transfert d'image xerographique
SU741986065A SU676191A3 (ru) 1973-01-12 1974-01-11 Устройство дл переноса изображени в электрофотографическом аппарате
ES422230A ES422230A1 (es) 1973-01-12 1974-01-11 Mecanismo de transferencia de imagenes.
JP49006966A JPS5836336B2 (ja) 1973-01-12 1974-01-12 トナ−ゾウテンシヤソウチ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00323159A US3850519A (en) 1973-01-12 1973-01-12 Xerographic image transfer apparatus

Publications (1)

Publication Number Publication Date
US3850519A true US3850519A (en) 1974-11-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00323159A Expired - Lifetime US3850519A (en) 1973-01-12 1973-01-12 Xerographic image transfer apparatus

Country Status (16)

Country Link
US (1) US3850519A (cs)
JP (1) JPS5836336B2 (cs)
AR (1) AR202116A1 (cs)
AU (1) AU6444674A (cs)
BE (1) BE809579A (cs)
BR (1) BR7400129D0 (cs)
CA (1) CA1033616A (cs)
CH (1) CH567748A5 (cs)
DE (1) DE2359331C3 (cs)
ES (1) ES422230A1 (cs)
FR (1) FR2324034A1 (cs)
GB (1) GB1446252A (cs)
IT (1) IT1006786B (cs)
NL (1) NL161900C (cs)
SE (1) SE387755B (cs)
SU (1) SU676191A3 (cs)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944355A (en) * 1973-04-09 1976-03-16 Research Laboratories Of Australia Apparatus for transporting and charging paper in electrostatic copiers and the like
US4055380A (en) * 1975-10-29 1977-10-25 Xerox Corporation Transfer charge maintaining system
US4077709A (en) * 1975-08-26 1978-03-07 Xerox Corporation Transfer charge control system
US4114536A (en) * 1976-08-26 1978-09-19 Ricoh Co., Ltd. Method of and apparatus for transfer printing a toner image
US4165171A (en) * 1974-04-08 1979-08-21 Oce-Van Der Grinten N.V. Electrographic apparatus and process
US4235548A (en) * 1975-01-07 1980-11-25 Minolta Camera Kabushiki Kaisha Electrostatic latent image transfer type copying apparatus
US4385824A (en) * 1981-09-08 1983-05-31 Rca Corporation Static discharge device
US4491407A (en) * 1981-05-29 1985-01-01 Sharp Kabushiki Kaisha Toner image transfer system
US4533618A (en) * 1974-08-01 1985-08-06 Mita Industrial Company, Ltd. Method for transferring toner image
US4575216A (en) * 1983-11-09 1986-03-11 Ricoh Company, Ltd. Electrophotographic copying apparatus including transfer charge corona and shield
US4673280A (en) * 1984-10-15 1987-06-16 Xerox Corporation Transfer charge control system
US4823158A (en) * 1987-06-22 1989-04-18 Xerox Corporation Biased pretransfer baffle
US4847652A (en) * 1986-09-19 1989-07-11 Sharp Kabushiki Kaisha Image transfer device
US4851879A (en) * 1985-08-29 1989-07-25 Sharp Kabushiki Kaisha Transfer device in electrophotographic copying machine
US4922303A (en) * 1987-08-21 1990-05-01 Minolta Camera Kabushiki Kaisha Image forming apparatus with corona discharge device for transferring toner image
EP0382448A2 (en) * 1989-02-08 1990-08-16 Kabushiki Kaisha Toshiba Transfer device
US4994861A (en) * 1989-06-30 1991-02-19 International Business Machines Corporation Printing machine with charge neutralizing system
US5091751A (en) * 1989-05-31 1992-02-25 Canon Kabushiki Kaisha Image forming apparatus utilizing intermediate transfer member
USRE33844E (en) * 1982-05-12 1992-03-10 Ricoh Company, Ltd. Transfer medium separation in a recording apparatus
US5198864A (en) * 1991-12-23 1993-03-30 Xerox Corporation Transfer system with field tailoring
US5249022A (en) * 1990-11-21 1993-09-28 Canon Kabushiki Kaisha Image forming device having an electrically dielectric regulating member conductive transfer member and a disposed at a transfer station thereof
US5284731A (en) * 1992-05-29 1994-02-08 Eastman Kodak Company Method of transfer of small electrostatographic toner particles
US5298955A (en) * 1993-03-29 1994-03-29 Xerox Corporation Blade cleanable corona porous transfer device
US5714079A (en) * 1995-06-12 1998-02-03 Eastman Kodak Company Method for making a thin gauge metallic article with electrical insulation on one side
US5758247A (en) * 1995-03-24 1998-05-26 Asahi Kogaku Kogyo Kabushiki Kaisha Charge removing device for electrophotographic printer
EP1367460A2 (en) 2002-05-31 2003-12-03 Xerox Corporation Paper input guide for a transfer zone in a xerographic printing apparatus
US20060269324A1 (en) * 2005-05-31 2006-11-30 Xerox Corporation Transfer charge device cover in non-image receiving medium area
US20060280531A1 (en) * 2005-06-10 2006-12-14 Xerox Corporation Transfer-detack assembly for a xerographic printer

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5313126B2 (cs) * 1973-04-26 1978-05-08
JPS5212542U (cs) * 1975-07-14 1977-01-28
JPS54108040U (cs) * 1978-01-18 1979-07-30
JPS54108041U (cs) * 1978-01-18 1979-07-30
US4239373A (en) * 1978-11-01 1980-12-16 Xerox Corporation Full wave rectification apparatus for operation of DC corotrons
NZ202810A (en) * 1981-12-23 1985-02-28 Mobil Oil Corp Converting fossil fuel successively to synthesis gas,oxygenates and hydrocarbons,then upgrading
JPH0677170B2 (ja) * 1984-12-10 1994-09-28 富士ゼロックス株式会社 電子複写機の転写補助装置
US4823152A (en) * 1987-12-11 1989-04-18 Moore Business Forms, Inc. Transfer corona shield
CA2007788A1 (en) * 1989-03-17 1990-09-17 Roger W. Bell Electrophotographic machine with efficient transfer

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US3409768A (en) * 1967-04-03 1968-11-05 Eastman Kodak Co Light lock for air ionizer to shield photosensitive material
US3483372A (en) * 1966-05-11 1969-12-09 Xerox Corp Corona charging device with conductive shield and insulating means on said shield
US3506259A (en) * 1967-10-12 1970-04-14 Xerox Corp Electrostatic sheet detacking apparatus
US3578859A (en) * 1969-07-03 1971-05-18 Xerox Corp Mechanical stripping apparatus
US3620617A (en) * 1969-11-24 1971-11-16 Ibm Electrophotographic apparatus with improved toner transfer
US3660656A (en) * 1970-08-26 1972-05-02 Eastman Kodak Co Light lock for corona device
US3675096A (en) * 1971-04-02 1972-07-04 Rca Corp Non air-polluting corona discharge devices
US3691375A (en) * 1970-09-08 1972-09-12 Addressograph Multigraph Charging device

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US3483372A (en) * 1966-05-11 1969-12-09 Xerox Corp Corona charging device with conductive shield and insulating means on said shield
US3409768A (en) * 1967-04-03 1968-11-05 Eastman Kodak Co Light lock for air ionizer to shield photosensitive material
US3506259A (en) * 1967-10-12 1970-04-14 Xerox Corp Electrostatic sheet detacking apparatus
US3578859A (en) * 1969-07-03 1971-05-18 Xerox Corp Mechanical stripping apparatus
US3620617A (en) * 1969-11-24 1971-11-16 Ibm Electrophotographic apparatus with improved toner transfer
US3660656A (en) * 1970-08-26 1972-05-02 Eastman Kodak Co Light lock for corona device
US3691375A (en) * 1970-09-08 1972-09-12 Addressograph Multigraph Charging device
US3675096A (en) * 1971-04-02 1972-07-04 Rca Corp Non air-polluting corona discharge devices

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Paper Entrance Guide , Beaudrot, IBM Technical Disclosure Bulletin, Vol. 15, No. 2, July 1972, p. 520. *

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944355A (en) * 1973-04-09 1976-03-16 Research Laboratories Of Australia Apparatus for transporting and charging paper in electrostatic copiers and the like
US4165171A (en) * 1974-04-08 1979-08-21 Oce-Van Der Grinten N.V. Electrographic apparatus and process
US4533618A (en) * 1974-08-01 1985-08-06 Mita Industrial Company, Ltd. Method for transferring toner image
US4235548A (en) * 1975-01-07 1980-11-25 Minolta Camera Kabushiki Kaisha Electrostatic latent image transfer type copying apparatus
US4077709A (en) * 1975-08-26 1978-03-07 Xerox Corporation Transfer charge control system
US4055380A (en) * 1975-10-29 1977-10-25 Xerox Corporation Transfer charge maintaining system
US4114536A (en) * 1976-08-26 1978-09-19 Ricoh Co., Ltd. Method of and apparatus for transfer printing a toner image
US4491407A (en) * 1981-05-29 1985-01-01 Sharp Kabushiki Kaisha Toner image transfer system
US4385824A (en) * 1981-09-08 1983-05-31 Rca Corporation Static discharge device
USRE33844E (en) * 1982-05-12 1992-03-10 Ricoh Company, Ltd. Transfer medium separation in a recording apparatus
US4575216A (en) * 1983-11-09 1986-03-11 Ricoh Company, Ltd. Electrophotographic copying apparatus including transfer charge corona and shield
US4673280A (en) * 1984-10-15 1987-06-16 Xerox Corporation Transfer charge control system
US4851879A (en) * 1985-08-29 1989-07-25 Sharp Kabushiki Kaisha Transfer device in electrophotographic copying machine
US4847652A (en) * 1986-09-19 1989-07-11 Sharp Kabushiki Kaisha Image transfer device
US4823158A (en) * 1987-06-22 1989-04-18 Xerox Corporation Biased pretransfer baffle
US4922303A (en) * 1987-08-21 1990-05-01 Minolta Camera Kabushiki Kaisha Image forming apparatus with corona discharge device for transferring toner image
EP0382448A2 (en) * 1989-02-08 1990-08-16 Kabushiki Kaisha Toshiba Transfer device
EP0382448A3 (en) * 1989-02-08 1991-06-12 Kabushiki Kaisha Toshiba Transfer device
US5138396A (en) * 1989-02-08 1992-08-11 Kabushiki Kaisha Toshiba Device for preventing paper from falling in a transfer device for electrophotographic recorders
US5091751A (en) * 1989-05-31 1992-02-25 Canon Kabushiki Kaisha Image forming apparatus utilizing intermediate transfer member
US4994861A (en) * 1989-06-30 1991-02-19 International Business Machines Corporation Printing machine with charge neutralizing system
US5249022A (en) * 1990-11-21 1993-09-28 Canon Kabushiki Kaisha Image forming device having an electrically dielectric regulating member conductive transfer member and a disposed at a transfer station thereof
US5198864A (en) * 1991-12-23 1993-03-30 Xerox Corporation Transfer system with field tailoring
US5284731A (en) * 1992-05-29 1994-02-08 Eastman Kodak Company Method of transfer of small electrostatographic toner particles
US5298955A (en) * 1993-03-29 1994-03-29 Xerox Corporation Blade cleanable corona porous transfer device
US5758247A (en) * 1995-03-24 1998-05-26 Asahi Kogaku Kogyo Kabushiki Kaisha Charge removing device for electrophotographic printer
US5714079A (en) * 1995-06-12 1998-02-03 Eastman Kodak Company Method for making a thin gauge metallic article with electrical insulation on one side
EP1367460A2 (en) 2002-05-31 2003-12-03 Xerox Corporation Paper input guide for a transfer zone in a xerographic printing apparatus
US6687479B2 (en) 2002-05-31 2004-02-03 Xerox Corporation Paper input guide for a transfer zone in a xerographic printing apparatus
US20060269324A1 (en) * 2005-05-31 2006-11-30 Xerox Corporation Transfer charge device cover in non-image receiving medium area
US7315719B2 (en) * 2005-05-31 2008-01-01 Xerox Corporation Transfer charge device cover in non-image receiving medium area
US20060280531A1 (en) * 2005-06-10 2006-12-14 Xerox Corporation Transfer-detack assembly for a xerographic printer

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Publication number Publication date
SE387755B (sv) 1976-09-13
JPS5836336B2 (ja) 1983-08-09
CH567748A5 (cs) 1975-10-15
JPS49105540A (cs) 1974-10-05
AR202116A1 (es) 1975-05-15
GB1446252A (en) 1976-08-18
FR2324034B1 (cs) 1978-03-24
FR2324034A1 (fr) 1977-04-08
IT1006786B (it) 1976-10-20
AU6444674A (en) 1975-07-17
SU676191A3 (ru) 1979-07-25
ES422230A1 (es) 1976-09-01
BR7400129D0 (pt) 1974-08-15
DE2359331C3 (de) 1984-09-20
DE2359331A1 (de) 1974-07-18
NL7400085A (cs) 1974-03-25
NL161900C (nl) 1980-03-17
CA1033616A (en) 1978-06-27
BE809579A (fr) 1974-05-02
DE2359331B2 (de) 1977-08-04
NL161900B (nl) 1979-10-15

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