GB2002655A - Electrophotographic development apparatus - Google Patents

Electrophotographic development apparatus

Info

Publication number
GB2002655A
GB2002655A GB7829585A GB7829585A GB2002655A GB 2002655 A GB2002655 A GB 2002655A GB 7829585 A GB7829585 A GB 7829585A GB 7829585 A GB7829585 A GB 7829585A GB 2002655 A GB2002655 A GB 2002655A
Authority
GB
United Kingdom
Prior art keywords
toner
hopper
image
roller
electrode
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.)
Granted
Application number
GB7829585A
Other versions
GB2002655B (en
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 GB2002655A publication Critical patent/GB2002655A/en
Application granted granted Critical
Publication of GB2002655B publication Critical patent/GB2002655B/en
Expired 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
    • G03G15/06—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
    • G03G15/0812—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 regulating means, e.g. structure of doctor blade
    • 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
    • G03G2215/0607—Developer solid type two-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
    • G03G2215/0602—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
    • 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
    • G03G2215/0641—Without separate supplying member (i.e. with developing housing sliding on donor member)

Abstract

An electrophotographic copier is described in which dry toner (T) is fed to the outer surface (5) of a photoconductive drum to develop an electrostatic image. The dry toner (T) is stored in a hopper (9) and the toner (T) is extracted from the bottom of the hopper by a roller (7) or belt which brings the toner (T) past doctor (9a) into contact with the image and develops it. An electrode (10) is immersed in the toner in the hopper and is energised to impart an electrostatic charge of one polarity or the other to the toner. This enables positive and negative image development to be achieved far more readily than in previously proposed copiers in which the toner was triboelectrically charged. In an alternative arrangement [fig. 7 (not shown)] the roller is disposed above the hopper and the electrode, in the form of a roller, contacts the developer on the surface thereof. <IMAGE>
GB7829585A 1977-08-19 1978-07-12 Electrophotographic development apparatus Expired GB2002655B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9920977A JPS5433033A (en) 1977-08-19 1977-08-19 Developing method for electrostatic latent image

Publications (2)

Publication Number Publication Date
GB2002655A true GB2002655A (en) 1979-02-28
GB2002655B GB2002655B (en) 1982-09-02

Family

ID=14241251

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7829585A Expired GB2002655B (en) 1977-08-19 1978-07-12 Electrophotographic development apparatus

Country Status (2)

Country Link
JP (1) JPS5433033A (en)
GB (1) GB2002655B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071466A2 (en) * 1981-07-27 1983-02-09 Xerox Corporation Apparatus, process for charging toner particles
EP0087074A2 (en) * 1982-02-19 1983-08-31 Hoechst Aktiengesellschaft Method and device for the development of a latent electrostatic image induced on a recording medium

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614269A (en) * 1979-07-16 1981-02-12 Canon Inc Developing device
JPS56165172A (en) * 1980-05-26 1981-12-18 Konishiroku Photo Ind Co Ltd Developing method of electrophotography
JPS59113449A (en) * 1982-12-20 1984-06-30 Minolta Camera Co Ltd Normal-reverse copying method
JPS60146268A (en) * 1984-01-10 1985-08-01 Konishiroku Photo Ind Co Ltd Developing device
US4643561A (en) * 1985-05-02 1987-02-17 Xerox Corporation Control system for an electrophotographic printing machine
JPS63100746U (en) * 1986-12-18 1988-06-30
JPS63314573A (en) * 1988-05-20 1988-12-22 Mita Ind Co Ltd Electrostatic latent image developing device
JPS63314572A (en) * 1988-05-20 1988-12-22 Mita Ind Co Ltd Electrostatic latent image developing device
JPH0614223B2 (en) * 1990-04-05 1994-02-23 キヤノン株式会社 Development device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071466A2 (en) * 1981-07-27 1983-02-09 Xerox Corporation Apparatus, process for charging toner particles
EP0071466B1 (en) * 1981-07-27 1986-11-12 Xerox Corporation Apparatus, process for charging toner particles
EP0087074A2 (en) * 1982-02-19 1983-08-31 Hoechst Aktiengesellschaft Method and device for the development of a latent electrostatic image induced on a recording medium
EP0087074A3 (en) * 1982-02-19 1984-03-21 Hoechst Aktiengesellschaft Method and device for the development of a latent electrostatic image induced on a recording medium
US4481903A (en) * 1982-02-19 1984-11-13 Hoechst Aktiengesellschaft Apparatus for developing an electrostatic latent image on a recording medium

Also Published As

Publication number Publication date
GB2002655B (en) 1982-09-02
JPS5433033A (en) 1979-03-10

Similar Documents

Publication Publication Date Title
GB1437991A (en) Electrophotographic device
GB2002655A (en) Electrophotographic development apparatus
GB1376278A (en) Electro photographic copying methods
GB853169A (en) Improvements in or relating to electro-photographic copying apparatus
GB1406666A (en) Electrophotographic developing process and apparatus
GB1469159A (en) Electrophotographic apparatus
ES486513A1 (en) Device and method for developing latent electrostatic images
GB1214512A (en) Developing electrostatic images
JPS55137551A (en) Electrophotographic dry type developing device
JPS54115233A (en) Reversal development process
JPS5557875A (en) Transfer type electrostatic copying machine
JPS54136339A (en) Developing apparatus
JPS5792355A (en) Developing device
JPS541638A (en) Electrophotographic apparatus
JPS54150132A (en) Transferring and separating device of electrophotographic copiers
JPS56116060A (en) Developing device
JPS5463830A (en) Development
JPS57104159A (en) Toner density detecting method
JPS5518631A (en) Developing and cleaning device in electrophotographic copier and others
JPS6488554A (en) Electrophotographic developer
JPS5515176A (en) Electrophotographic copying method
GB2018451A (en) Electrophotographic process and apparatus
JPS57190970A (en) Developing device of electronic copying machine
JPS53124431A (en) Electrophotographic copier
JPS5794770A (en) Cleaning method of electrophotographic photoreceptor

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940712