US3929098A - Toner loading for touchdown donor - Google Patents

Toner loading for touchdown donor Download PDF

Info

Publication number
US3929098A
US3929098A US419732A US41973273A US3929098A US 3929098 A US3929098 A US 3929098A US 419732 A US419732 A US 419732A US 41973273 A US41973273 A US 41973273A US 3929098 A US3929098 A US 3929098A
Authority
US
United States
Prior art keywords
particles
carrier particles
sump
toner
development system
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
US419732A
Other languages
English (en)
Inventor
Alan J Liebman
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 US419732A priority Critical patent/US3929098A/en
Priority to CA208,700A priority patent/CA1047246A/en
Priority to GB48996/74A priority patent/GB1490210A/en
Priority to JP49134170A priority patent/JPS5087334A/ja
Priority to FR7439079A priority patent/FR2252596B1/fr
Application granted granted Critical
Publication of US3929098A publication Critical patent/US3929098A/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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0808—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer supplying means, e.g. structure of developer supply roller
    • 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
    • G03G2215/06—Developing structures, details
    • G03G2215/0602—Developer
    • G03G2215/0604—Developer solid type
    • G03G2215/0614—Developer solid type one-component
    • 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
    • G03G2215/06—Developing structures, details
    • G03G2215/0634—Developing device
    • G03G2215/0636—Specific type of dry developer device
    • 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
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • a toner laden rotating donor member (which may be a roller or an endless belt) is located adjacent to a moving photoreceptive surface bearing a latent electrostatic image thereon.
  • the donor member is spaced from the photoreceptor so that a gap of about to 8 'mils exists between the toner layer surface and the photoreceptive surface.
  • the toner on the donor member is given a charge in polarity opposite to the polarity of the electrostatic latent image; As the donor member carries toner past the latent image, the toner is attracted from the donor to the image to develop the image.
  • One of the main problems in prior touchdown development systems is loading the donor roll with an adequate amount of toner to provide a developed image of an acceptable density.
  • a more detailed relatedobject is to provide a method and meansfor loading the donor member with a generally uniform layer of toner particles which will result in a generally uniform development of the electrostatic latent image.
  • the sole figure is a schematic view of a touchdown development system.
  • a xerographic photoreceptor plate is in the form of a drum 10 which passes through stations A-E in the direction shown by the arrow.
  • the drum has a suitable photosensitive surface on which a latent electrostatic image can be formed.
  • a plurality of stations about the periphery of the drum which carry out the reproduction process are: charging station A, exposing station B, developing station C, transfer station D, and cleaning station E. These stations represent conventional means for carrying out their respective functions and do not form a part of the present invention.
  • a corona charging device 12 places a uniform electrostatic charge on the photosensitive material.
  • a light pattern by a suitable exposing apparatus 14, is exposed onto the charged surface of the drum 10.
  • the latent image thereby formed on the surface of the drum is developed by the application of toner particles 15 by a donor member 16 at the developing station C. After the image is developed at station C, it passes through transfer stationD, wherein the toner is transferred to a sheet 17.
  • a corona charging device 18 is utilized in the normal way to facilitate transfer and fuser device 20 is provided to fuse the toner to sheet 17. Following transfer of the developed image to the copy sheet, the drum rotates through cleaning station E, comprising cleaning brush,22 which cleans residual toner particles from the drum 10.
  • a developer sump 26 containing a developer mix 28 therein is located below the donor member 16.
  • the developer mix comprises toner particles 15 and ferromagnetic carrier particles.
  • the toner particles and the carrier particles are selected that the toner particles will become triboelectrically charged to'a polarity op posite the charge of the latentimage upon mixing with the carrier particles. In this particular instance, if the charge of the latent image is positive then the triboelectric charge on the tonerparticles will be selected to be negative.
  • Any type of agitating means may be provided for agitating the developer mix in the sump -to create the proper triboelectric charge on the toner particles.
  • a magnetic brush in the form of a cylinder housing.30 is provided between the donor 16 .and the developer.
  • a pickup magnet- 3l ,and a developing magnet 32 are provided on a stationary iron keeper 33 within the cylinder housing 30.
  • the magnets, 31 and 32 are arranged so that, upon rotation of the cylinder housing 30 through the developerbed, magnetic carrier particles with toner triboelectrically attached thereto will be picked up by the cylinder housing at those portions corresponding to the magnetic field of pickup magnet 31-and brought adjacent to the outer surface of the donor member 16 and within the magnetic field of development magnet 32. which causes thedeveloper bristles on the brush 30 to become erect.
  • the unused toner particles as well as the magnetic carrier particles carried thereby are brought outof thefleld of the magnet 32 whereby they fall bygravity back into the developer sump where the carrier particles can be retoned with toner particles.
  • the magnetic brush 30 In order to create an electrical field for developing or loading the donor 16 with toner particles, and assuming that the latent image carries a positive charge, the magnetic brush 30 is biased to 6OO volts and the donor 16 is biased to +200 volts which is approximately the background potential on the drum 10. This field effects transfer of the negative toner particleslS to the donor 16 from the carrier particles as the developer is pres ented to the donor by the magnetic brush 30.
  • a carrier trap 36 which is in the form of a magnetic roller, is rotatably located adjacent the drum to pick off any carrier particles 38 which may be on the donor 16.
  • a scraper member 40 engages the roller 36 to scrape any carrier particles on the roller 36 therefrom.
  • the carrier particles 38 scraped from the pick-off roller 36 fall by gravity back into the sump 26 for retoning.
  • a scraper member 42 is provided to scrape residual toner particles from the donor 16 which fall back into the sump 26.
  • the carrier particle size distribution should be such that at least 85%, preferably 95%, of all of the particles, by volume, are less than 50 microns average diameter and preferably between and 50 microns. This is necessary in order to coat the donor [6 with a generally uniform layer of toner particles. It has been found that when larger size carrier particles are utilized, numerous carrier bead tracks which were relatively wide and deep were formed in the toner layer on the donor drum 16. When carrier particles of the size specified above are utilized, thinner and shallower carrier tracks were formed in the deposited toner layer which were insignificant insofar as disturbing the uniformity of the toner layer on the donor drum 16.
  • a development system for developing latent electrostaticimages carried by a photoreceptor of an electrostatic processor comprising the combination of a sump for storing a supply of developer, said developer including ferromagnetic carrier particles having toner particles triboelectrically attracted thereto; a rotatable doner member positioned adjacent said photoreceptor for applying toner particles. to said photoreceptor in conformity with said latent images; magnetic means disposed between said sump and said doner member for loading said doner member with toner particles; and means coupled to said doner member and said magnetic means for creating an electrostatic field between said magnetic means and said doner member for stripping the toner particles from the carrier particles during the loading of said doner member.
  • a rotatable magnetic means is located adjacent the surface of said doner member to magnetically attract any carrier particles carried by said donor member prior to said carrier particles being presented to said latent image, and means for removing said magnetic particles from said rotatable magnetic means.
  • a development system for developing latent electrostatic images carried by a photoreceptor of an electrostatic processor comprising the combination of a supply of developer including ferromagnetic carrier particles having toner particles triboelectrically attracted thereto, at least 85% by volume of all of said carrier particles having a diameter less than 50 microns; a doner member positioned adjacent said photoreceptor for developing said images with toner particles; and means disposed between said sump and said doner member for removing developer from said sump, stripping toner particles from the carrier particles of said removed developer and loading said toner member with a substantially uniform layer of said stripped toner particles.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Cleaning In Electrography (AREA)
US419732A 1973-11-28 1973-11-28 Toner loading for touchdown donor Expired - Lifetime US3929098A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US419732A US3929098A (en) 1973-11-28 1973-11-28 Toner loading for touchdown donor
CA208,700A CA1047246A (en) 1973-11-28 1974-09-09 Toner loading for touchdown donor
GB48996/74A GB1490210A (en) 1973-11-28 1974-11-12 Apparatus for developing an electrostatic latent image
JP49134170A JPS5087334A (enrdf_load_stackoverflow) 1973-11-28 1974-11-21
FR7439079A FR2252596B1 (enrdf_load_stackoverflow) 1973-11-28 1974-11-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US419732A US3929098A (en) 1973-11-28 1973-11-28 Toner loading for touchdown donor

Publications (1)

Publication Number Publication Date
US3929098A true US3929098A (en) 1975-12-30

Family

ID=23663522

Family Applications (1)

Application Number Title Priority Date Filing Date
US419732A Expired - Lifetime US3929098A (en) 1973-11-28 1973-11-28 Toner loading for touchdown donor

Country Status (5)

Country Link
US (1) US3929098A (enrdf_load_stackoverflow)
JP (1) JPS5087334A (enrdf_load_stackoverflow)
CA (1) CA1047246A (enrdf_load_stackoverflow)
FR (1) FR2252596B1 (enrdf_load_stackoverflow)
GB (1) GB1490210A (enrdf_load_stackoverflow)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036175A (en) * 1976-03-30 1977-07-19 Sperry Rand Corporation High speed development technique
DE2800056A1 (de) * 1977-01-05 1978-07-13 Xerox Corp Reproduktionsmaschine, sowie elektrofotografische druckmaschine
US4101909A (en) * 1976-07-30 1978-07-18 Epp Corp. Magnetic inking apparatus for pulsed electrical printing
US4103306A (en) * 1976-07-30 1978-07-25 Epp Corp. Non-impact printer with magnetic ink reorientation
US4230070A (en) * 1977-08-24 1980-10-28 Minolta Camera Kabushiki Kaisha Device for automatically replenishing toner to dry-type developing apparatus for electrophotography
DE3034093A1 (de) * 1979-09-11 1981-04-02 Canon K.K., Tokyo Entwicklungseinrichtung
US4295442A (en) * 1978-08-04 1981-10-20 Sperry Corporation Magnetic toner apparatus
DE3108194A1 (de) * 1980-03-04 1981-12-24 Canon K.K., Tokyo Entwicklungsverfahren und entwicklungseinrichtung
US4378158A (en) * 1979-07-16 1983-03-29 Canon Kabushiki Kaisha Developing apparatus
DE3329497A1 (de) * 1982-08-16 1984-03-15 Tokyo Shibaura Denki K.K., Kawasaki Entwicklungsvorrichtung
EP0026677B1 (en) * 1979-10-01 1984-05-09 Xerox Corporation Magnetic photoreceptor cleaning system
JPS59121347A (ja) * 1982-12-28 1984-07-13 Toshiba Corp 現像装置
US4487496A (en) * 1981-05-13 1984-12-11 Siemens Aktiengesellschaft Device for adjusting the level of a developing mixture, which consists of a toner and carrier particles, on a developing roller
US4511268A (en) * 1979-10-19 1985-04-16 Marshall Eric J High speed printer
US4743937A (en) * 1983-12-12 1988-05-10 Xerox Corporation Apparatus for charging toner particles
EP0322940A1 (en) * 1987-12-07 1989-07-05 Agfa-Gevaert N.V. Dry toner development
US5032872A (en) * 1989-10-30 1991-07-16 Xerox Corporation Developing device with dual donor rollers including electrically biased electrodes for each donor roller
EP0414455A3 (en) * 1989-08-21 1991-08-07 Xerox Corporation Hybrid development system
US5063875A (en) * 1990-03-19 1991-11-12 Xerox Corporation Development apparatus having a transport roll rotating at least twice the surface velocity of a donor roll
US5177323A (en) * 1990-10-31 1993-01-05 Kabushiki Kaisha Toshiba Developing device for developing an electrostatic latent image by a one-component developing agent
EP0435566A3 (en) * 1989-12-26 1993-01-13 Xerox Corporation Electrostatographic apparatus
US5270782A (en) * 1991-12-23 1993-12-14 Xerox Corporation Single-component development system with intermediate donor member
US5341197A (en) * 1992-12-07 1994-08-23 Xerox Corporation Proper charging of donor roll in hybrid development
US5416567A (en) * 1992-06-30 1995-05-16 Sharp Kabushiki Kaisha Developing device and a developing method having a conductive member upstream of image data forming member
EP0725322A1 (en) * 1995-02-03 1996-08-07 Hewlett-Packard Company Dry development process with liquid toner
US5587224A (en) * 1995-03-27 1996-12-24 Xerox Corporation Developing apparatus including a coated developer roller
US5634181A (en) * 1993-02-16 1997-05-27 Fuji Xerox Co., Ltd. Developing apparatus
US5937236A (en) * 1996-09-11 1999-08-10 Samsung Electronics Co., Ltd. Ghost-image preventing apparatus for a developing roller
US6253053B1 (en) 2000-01-11 2001-06-26 Xerox Corporation Enhanced phenolic developer roll sleeves
US6526248B1 (en) * 1999-09-16 2003-02-25 Ricoh Company, Ltd. Toner support member and developing device prevented from charging toner by friction
US20040002015A1 (en) * 2002-03-15 2004-01-01 Yoshio Ozawa Method for developing in hybrid developing apparatus
US20040022549A1 (en) * 2002-03-26 2004-02-05 Yoshio Ozawa Image forming apparatus and image forming method
DE10246022B3 (de) * 2002-10-02 2004-07-22 OCé PRINTING SYSTEMS GMBH Vorrichtung und Verfahren zum Aufsammeln von magnetisierbaren Trägerteilchen aus einem Gemisch von Tonerteilchen und magnetisierbaren Trägerteilchen
US20060024092A1 (en) * 2004-07-30 2006-02-02 Kyocera Mita Corporation Developing device
US20080232859A1 (en) * 2007-03-20 2008-09-25 Kyocera Mita Corporation Image forming apparatus
US20080232860A1 (en) * 2007-03-20 2008-09-25 Kyocera Mita Corporation Image forming apparatus
US20080232862A1 (en) * 2007-03-20 2008-09-25 Kyocera Mita Corporation Image forming apparatus
US20080292365A1 (en) * 2007-05-25 2008-11-27 Kyocera Mita Corporation Image forming apparatus and developing device
US20090003891A1 (en) * 2007-06-27 2009-01-01 Kyocera Mita Corporation Image forming apparatus
JP2009031749A (ja) * 2007-06-27 2009-02-12 Kyocera Mita Corp 画像形成装置
US20090190970A1 (en) * 2007-07-23 2009-07-30 Ricoh Printing Systems, Ltd. Development Device and Image Forming Apparatus Using the Same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5451847A (en) * 1977-09-30 1979-04-24 Ricoh Co Ltd Direct recorder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405682A (en) * 1964-06-08 1968-10-15 Xerox Corp Xerographic development apparatus with web loading means to remove residual developer
US3580673A (en) * 1968-08-26 1971-05-25 Xerox Corp Cleaning apparatus
US3654902A (en) * 1969-11-28 1972-04-11 Plastic Coating Corp Toner unit for photoelectrostatic reproduction
US3696783A (en) * 1970-12-15 1972-10-10 Xerox Corp Automated touchdown developement system
US3759222A (en) * 1971-03-04 1973-09-18 Xerox Corp Microfield donor with continuously reversing microfields

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405682A (en) * 1964-06-08 1968-10-15 Xerox Corp Xerographic development apparatus with web loading means to remove residual developer
US3580673A (en) * 1968-08-26 1971-05-25 Xerox Corp Cleaning apparatus
US3654902A (en) * 1969-11-28 1972-04-11 Plastic Coating Corp Toner unit for photoelectrostatic reproduction
US3696783A (en) * 1970-12-15 1972-10-10 Xerox Corp Automated touchdown developement system
US3759222A (en) * 1971-03-04 1973-09-18 Xerox Corp Microfield donor with continuously reversing microfields

Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036175A (en) * 1976-03-30 1977-07-19 Sperry Rand Corporation High speed development technique
US4101909A (en) * 1976-07-30 1978-07-18 Epp Corp. Magnetic inking apparatus for pulsed electrical printing
US4103306A (en) * 1976-07-30 1978-07-25 Epp Corp. Non-impact printer with magnetic ink reorientation
DE2800056A1 (de) * 1977-01-05 1978-07-13 Xerox Corp Reproduktionsmaschine, sowie elektrofotografische druckmaschine
US4230070A (en) * 1977-08-24 1980-10-28 Minolta Camera Kabushiki Kaisha Device for automatically replenishing toner to dry-type developing apparatus for electrophotography
US4295442A (en) * 1978-08-04 1981-10-20 Sperry Corporation Magnetic toner apparatus
US4378158A (en) * 1979-07-16 1983-03-29 Canon Kabushiki Kaisha Developing apparatus
US4383497A (en) * 1979-09-11 1983-05-17 Canon Kabushiki Kaisha Developing device
DE3034093A1 (de) * 1979-09-11 1981-04-02 Canon K.K., Tokyo Entwicklungseinrichtung
EP0026677B1 (en) * 1979-10-01 1984-05-09 Xerox Corporation Magnetic photoreceptor cleaning system
US4511268A (en) * 1979-10-19 1985-04-16 Marshall Eric J High speed printer
DE3108194A1 (de) * 1980-03-04 1981-12-24 Canon K.K., Tokyo Entwicklungsverfahren und entwicklungseinrichtung
US4487496A (en) * 1981-05-13 1984-12-11 Siemens Aktiengesellschaft Device for adjusting the level of a developing mixture, which consists of a toner and carrier particles, on a developing roller
DE3329497A1 (de) * 1982-08-16 1984-03-15 Tokyo Shibaura Denki K.K., Kawasaki Entwicklungsvorrichtung
JPS59121347A (ja) * 1982-12-28 1984-07-13 Toshiba Corp 現像装置
US4743937A (en) * 1983-12-12 1988-05-10 Xerox Corporation Apparatus for charging toner particles
EP0322940A1 (en) * 1987-12-07 1989-07-05 Agfa-Gevaert N.V. Dry toner development
EP0414455A3 (en) * 1989-08-21 1991-08-07 Xerox Corporation Hybrid development system
US5032872A (en) * 1989-10-30 1991-07-16 Xerox Corporation Developing device with dual donor rollers including electrically biased electrodes for each donor roller
EP0435566A3 (en) * 1989-12-26 1993-01-13 Xerox Corporation Electrostatographic apparatus
US5063875A (en) * 1990-03-19 1991-11-12 Xerox Corporation Development apparatus having a transport roll rotating at least twice the surface velocity of a donor roll
US5177323A (en) * 1990-10-31 1993-01-05 Kabushiki Kaisha Toshiba Developing device for developing an electrostatic latent image by a one-component developing agent
US5270782A (en) * 1991-12-23 1993-12-14 Xerox Corporation Single-component development system with intermediate donor member
US5416567A (en) * 1992-06-30 1995-05-16 Sharp Kabushiki Kaisha Developing device and a developing method having a conductive member upstream of image data forming member
US5341197A (en) * 1992-12-07 1994-08-23 Xerox Corporation Proper charging of donor roll in hybrid development
EP0601786A3 (en) * 1992-12-07 1995-07-19 Xerox Corp Correct loading of a delivery roller for hybrid development.
US5634181A (en) * 1993-02-16 1997-05-27 Fuji Xerox Co., Ltd. Developing apparatus
EP0725322A1 (en) * 1995-02-03 1996-08-07 Hewlett-Packard Company Dry development process with liquid toner
US5587224A (en) * 1995-03-27 1996-12-24 Xerox Corporation Developing apparatus including a coated developer roller
US5937236A (en) * 1996-09-11 1999-08-10 Samsung Electronics Co., Ltd. Ghost-image preventing apparatus for a developing roller
US6526248B1 (en) * 1999-09-16 2003-02-25 Ricoh Company, Ltd. Toner support member and developing device prevented from charging toner by friction
US6253053B1 (en) 2000-01-11 2001-06-26 Xerox Corporation Enhanced phenolic developer roll sleeves
US6381848B2 (en) 2000-01-11 2002-05-07 Xerox Corporation Method of making enhanced phenolic developer roll sleeves
US6868240B2 (en) 2002-03-15 2005-03-15 Kyocera Corporation Method for developing in hybrid developing apparatus
US20040002015A1 (en) * 2002-03-15 2004-01-01 Yoshio Ozawa Method for developing in hybrid developing apparatus
US20040022549A1 (en) * 2002-03-26 2004-02-05 Yoshio Ozawa Image forming apparatus and image forming method
US6829448B2 (en) 2002-03-26 2004-12-07 Kyocera Corporation Image forming apparatus and image forming method
DE10246022B3 (de) * 2002-10-02 2004-07-22 OCé PRINTING SYSTEMS GMBH Vorrichtung und Verfahren zum Aufsammeln von magnetisierbaren Trägerteilchen aus einem Gemisch von Tonerteilchen und magnetisierbaren Trägerteilchen
US20080240795A1 (en) * 2004-07-30 2008-10-02 Kyocera Mita Corporation Developing Device Used In An Image Forming Apparatus
US20060024092A1 (en) * 2004-07-30 2006-02-02 Kyocera Mita Corporation Developing device
US7298995B2 (en) 2004-07-30 2007-11-20 Kyocera Mita Corporation Developing device used in an image forming apparatus
US20080232859A1 (en) * 2007-03-20 2008-09-25 Kyocera Mita Corporation Image forming apparatus
US20080232862A1 (en) * 2007-03-20 2008-09-25 Kyocera Mita Corporation Image forming apparatus
US20080232860A1 (en) * 2007-03-20 2008-09-25 Kyocera Mita Corporation Image forming apparatus
US7742727B2 (en) 2007-03-20 2010-06-22 Kyocera Mita Corporation Image forming apparatus
US7826781B2 (en) 2007-03-20 2010-11-02 Kyocera Mita Corporation Image forming apparatus with controlled application of alternating-current bias
CN101271302B (zh) * 2007-03-20 2010-11-17 京瓷美达株式会社 图像形成装置
US7941080B2 (en) 2007-03-20 2011-05-10 Kyocera Mita Corporation Image forming apparatus
US20080292365A1 (en) * 2007-05-25 2008-11-27 Kyocera Mita Corporation Image forming apparatus and developing device
US20090003891A1 (en) * 2007-06-27 2009-01-01 Kyocera Mita Corporation Image forming apparatus
JP2009031749A (ja) * 2007-06-27 2009-02-12 Kyocera Mita Corp 画像形成装置
US7613417B2 (en) 2007-06-27 2009-11-03 Kyocera Mita Corporation Image forming apparatus
US20090190970A1 (en) * 2007-07-23 2009-07-30 Ricoh Printing Systems, Ltd. Development Device and Image Forming Apparatus Using the Same
US8073369B2 (en) 2007-07-23 2011-12-06 Ricoh Company, Ltd. Development device transferring only a toner layer to a developing roller and image apparatus using the same

Also Published As

Publication number Publication date
GB1490210A (en) 1977-10-26
JPS5087334A (enrdf_load_stackoverflow) 1975-07-14
CA1047246A (en) 1979-01-30
FR2252596A1 (enrdf_load_stackoverflow) 1975-06-20
FR2252596B1 (enrdf_load_stackoverflow) 1977-11-04

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