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EP2088474A3 - Image forming apparatus and image forming method - Google Patents

Image forming apparatus and image forming method Download PDF

Info

Publication number
EP2088474A3
EP2088474A3 EP09151328A EP09151328A EP2088474A3 EP 2088474 A3 EP2088474 A3 EP 2088474A3 EP 09151328 A EP09151328 A EP 09151328A EP 09151328 A EP09151328 A EP 09151328A EP 2088474 A3 EP2088474 A3 EP 2088474A3
Authority
EP
European Patent Office
Prior art keywords
image bearing
toner
bearing members
additives
image forming
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.)
Withdrawn
Application number
EP09151328A
Other languages
German (de)
French (fr)
Other versions
EP2088474A2 (en
Inventor
Ken Yoshida
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of EP2088474A2 publication Critical patent/EP2088474A2/en
Publication of EP2088474A3 publication Critical patent/EP2088474A3/en
Withdrawn legal-status Critical Current

Links

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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit
    • G03G15/0131—Details of unit for transferring a pattern to a second base
    • 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
    • G03G15/1605—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 at least one intermediate support
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G03G2215/0122—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt
    • G03G2215/0125—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted
    • G03G2215/0129—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted horizontal medium transport path at the secondary transfer
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G03G2215/0122—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt
    • G03G2215/0125—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted
    • G03G2215/0132—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted vertical medium transport path at the secondary transfer
    • 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
    • G03G2215/16—Transferring device, details
    • G03G2215/1604—Main transfer electrode
    • G03G2215/1614—Transfer roll

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

An image forming apparatus includes image bearing members (20), transfer members (12), and pressing units (18). The image bearing members (20) include a black image bearing member (20K) for forming black image and other image bearing members (20Y,20M,20C) for forming other color images. The toner image from the image bearing members is transferred with the transfer member. The pressing units (18) press the transfer member (12) to the image bearing members (20) with a given pressure. The toner has a sunken rate of additives of 40% or more. The sunken rate of additives X% = { (A-B) / A } × 100. "A (m2/g)" is a BET specific surface of toner matrix before sinking additives in toner, and "B (m2/g)" is a BET specific surface of the toner after sinking additives in toner. The pressing unit (18K) for the black image bearing member (20K) presses the transfer member (12K) with a pressure set smaller compared to other pressing units (18) for the other image bearing members (20).
EP09151328A 2008-02-06 2009-01-26 Image forming apparatus and image forming method Withdrawn EP2088474A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008026587 2008-02-06
JP2008064799A JP2009211019A (en) 2007-07-10 2008-03-13 Image forming apparatus and image forming method

Publications (2)

Publication Number Publication Date
EP2088474A2 EP2088474A2 (en) 2009-08-12
EP2088474A3 true EP2088474A3 (en) 2009-09-23

Family

ID=40668458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09151328A Withdrawn EP2088474A3 (en) 2008-02-06 2009-01-26 Image forming apparatus and image forming method

Country Status (2)

Country Link
EP (1) EP2088474A3 (en)
JP (1) JP2009211019A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5677331B2 (en) * 2011-01-31 2015-02-25 京セラドキュメントソリューションズ株式会社 Toner for electrostatic latent image development
JP2017032657A (en) * 2015-07-29 2017-02-09 富士ゼロックス株式会社 Unit for image forming apparatus, process cartridge, and image forming apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040179860A1 (en) * 2003-03-12 2004-09-16 Toshiba Tec Kabushiki Kaisha Image forming apparatus
JP2005024936A (en) * 2003-07-03 2005-01-27 Canon Inc Image forming apparatus
EP1857888A1 (en) * 2006-05-16 2007-11-21 Ricoh Company, Ltd. Image Forming Apparatus
JP2007304404A (en) * 2006-05-12 2007-11-22 Ricoh Co Ltd Color image forming apparatus
EP1862867A1 (en) * 2006-05-30 2007-12-05 Ricoh Company, Ltd. Image forming apparatus
US20090016784A1 (en) * 2007-07-10 2009-01-15 Ken Yoshida Image forming apparatus and image forming method

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63149018A (en) 1986-12-12 1988-06-21 Nippon Steel Corp Roller straightening method for long columns
JPH03100661A (en) 1989-09-14 1991-04-25 Konica Corp Image forming method
JP2978367B2 (en) 1993-06-10 1999-11-15 三田工業株式会社 Transfer device
JP3328013B2 (en) 1993-07-08 2002-09-24 コニカ株式会社 Electrostatic image developer and multicolor image forming method
JPH07152202A (en) 1993-11-29 1995-06-16 Hitachi Chem Co Ltd Electrostatic charge developing toner, its production and developer
JPH09152791A (en) * 1995-09-26 1997-06-10 Fuji Xerox Co Ltd Image forming device
JPH09319134A (en) 1996-05-29 1997-12-12 Konica Corp Static-charge-image development toner and multicolor image forming method
JP3762078B2 (en) 1997-11-17 2006-03-29 三洋化成工業株式会社 Dry toner and its production method
JP2000162899A (en) 1998-09-25 2000-06-16 Canon Inc Image-forming device
JP2000155476A (en) 1998-11-24 2000-06-06 Fuji Xerox Co Ltd Image forming device
JP2002014515A (en) 2000-06-28 2002-01-18 Ricoh Co Ltd Image forming device and belt device used for the same
JP2002318494A (en) * 2001-04-20 2002-10-31 Fuji Xerox Co Ltd Image forming device
JP4497771B2 (en) 2001-09-25 2010-07-07 株式会社リコー Image forming method and image forming apparatus
JP2004264559A (en) 2003-02-28 2004-09-24 Canon Inc Image forming apparatus
JP2007041202A (en) * 2005-08-02 2007-02-15 Ricoh Co Ltd Transfer evaluating device, image forming method using the same and image forming apparatus
JP2007071963A (en) * 2005-09-05 2007-03-22 Fuji Xerox Co Ltd Developing device, and image forming apparatus and process cartridge using the same
JP2007108622A (en) * 2005-09-13 2007-04-26 Ricoh Co Ltd Toner and method for manufacturing same, and developer, toner container, process cartridge, image forming apparatus, and image forming method
JP4810183B2 (en) * 2005-10-18 2011-11-09 キヤノン株式会社 Toner production method
JP2006301673A (en) 2006-08-15 2006-11-02 Canon Inc Image forming apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040179860A1 (en) * 2003-03-12 2004-09-16 Toshiba Tec Kabushiki Kaisha Image forming apparatus
JP2005024936A (en) * 2003-07-03 2005-01-27 Canon Inc Image forming apparatus
JP2007304404A (en) * 2006-05-12 2007-11-22 Ricoh Co Ltd Color image forming apparatus
EP1857888A1 (en) * 2006-05-16 2007-11-21 Ricoh Company, Ltd. Image Forming Apparatus
EP1862867A1 (en) * 2006-05-30 2007-12-05 Ricoh Company, Ltd. Image forming apparatus
US20090016784A1 (en) * 2007-07-10 2009-01-15 Ken Yoshida Image forming apparatus and image forming method

Also Published As

Publication number Publication date
EP2088474A2 (en) 2009-08-12
JP2009211019A (en) 2009-09-17

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