GB1083363A - Apparatus for developing electrostatic images of records - Google Patents

Apparatus for developing electrostatic images of records

Info

Publication number
GB1083363A
GB1083363A GB3892/65A GB389265A GB1083363A GB 1083363 A GB1083363 A GB 1083363A GB 3892/65 A GB3892/65 A GB 3892/65A GB 389265 A GB389265 A GB 389265A GB 1083363 A GB1083363 A GB 1083363A
Authority
GB
United Kingdom
Prior art keywords
brush
toner
powder
brushes
electro
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
Application number
GB3892/65A
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB1083363A publication Critical patent/GB1083363A/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
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

1,083,363. Electro-static developing apparatus. HITACHI Ltd. Jan. 28, 1965 [Jan. 30, 1964], No. 3892/65. Headings G2H and G3R. Apparatus for dry powder development of electro-static images comprises a rotating magnetic brush 4 in contact with the surface of a moving web 14 on which electro-static images are formed, and a rotating insulated brush 5 of fine metal wires on an insulated hub 7, the brush 5 being in deep intersection with the magnetic brush and mostly immersed in reservoir 9 of a developer powder consisting of a mixture of iron-powder carrier and a toner powder which may be a polymer derived from styrene and/or its homologues. Brush 4 is formed by ferrite permanent bar or arcuate magnets 1 on a non- magnetic hexagonal bar 3. The iron powder and toner are charged to opposite electro-static polarities by the rotation of brush 5 and are mutually attracted. Excess free toner is removed from the magnetically saturated brush 4, formed of iron powder, by brush 5. Fresh toner is supplied from store 10 in which it is agitated and charged by brushes 12 to prevent coagulation, and is fed in controlled amounts by brush 13 to reservoir 9. As shown, two intersecting brushes 5 are used with separate magnetic brushes 4. The level of toner is observed through the transparent wall of store 10. Image density control is carried out by measuring the light reflected from brush 4 with a transducer whose output is amplified and fed to a device which controls the speed of rotation of brushes 4 and 5.
GB3892/65A 1964-01-30 1965-01-28 Apparatus for developing electrostatic images of records Expired GB1083363A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP426664 1964-01-30

Publications (1)

Publication Number Publication Date
GB1083363A true GB1083363A (en) 1967-09-13

Family

ID=11579720

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3892/65A Expired GB1083363A (en) 1964-01-30 1965-01-28 Apparatus for developing electrostatic images of records

Country Status (2)

Country Link
US (1) US3318284A (en)
GB (1) GB1083363A (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402698A (en) * 1966-06-06 1968-09-24 Konishiroku Photo Ind Magnet assembly for magnetic developing brush and developing apparatus for electrostatic process
US3357402A (en) * 1966-12-27 1967-12-12 Xerox Corp Rotary brush development
US3557751A (en) * 1967-05-20 1971-01-26 Minolta Camera Kk Device for dry development in electrophotography
US3552355A (en) * 1968-04-22 1971-01-05 Xerox Corp Development apparatus
US3848566A (en) * 1969-07-11 1974-11-19 Xerox Corp Donor apparatus
US3632370A (en) * 1970-03-20 1972-01-04 Xerox Corp Multiple brush development
US3802389A (en) * 1971-04-30 1974-04-09 Iwasaki Kk Developing apparatus used in electrophotography
BE795110A (en) * 1972-02-07 1973-05-29 Identicator Corp FINGERPRINT DEVELOPER DEVICE
US3900002A (en) * 1972-05-10 1975-08-19 Xerox Corp Donor apparatus
JPS5426172B2 (en) * 1973-05-23 1979-09-03
US3892908A (en) * 1973-06-25 1975-07-01 Minnesota Mining & Mfg Coating of solid substrates with magnetically propelled particles
JPS50149350A (en) * 1974-05-21 1975-11-29
US4041903A (en) * 1974-05-21 1977-08-16 Konishiroku Photo Industry Co., Ltd. Developing device for use in electrophotography
US3945343A (en) * 1975-03-24 1976-03-23 General Electric Company Magnetic brush for use in magnetic printing
JPS602598Y2 (en) * 1978-04-19 1985-01-24 株式会社東芝 Toner concentration detection device
US4330193A (en) * 1979-10-01 1982-05-18 Xerox Corporation Development system
JPS60178472A (en) * 1984-02-27 1985-09-12 Oki Electric Ind Co Ltd Dry type developing device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103445A (en) * 1963-09-10 Method of developing an electrostatic
US2987037A (en) * 1955-12-21 1961-06-06 Ibm Xerographic printer
GB927928A (en) * 1958-08-26 1963-06-06 Ozalid Co Ltd Improvements in and relating to electro-photographic developing apparatus
US3140199A (en) * 1961-04-28 1964-07-07 Eastman Kodak Co Vibrating belt powder cloud generator for xerography
US3152924A (en) * 1961-05-24 1964-10-13 Robertson Photo Mechanix Inc Xerographic brush
NL286833A (en) * 1961-12-27
US3145122A (en) * 1962-08-13 1964-08-18 Addressograph Multigraph Apparatus for applying developer powder to photo-conductive insulating material

Also Published As

Publication number Publication date
US3318284A (en) 1967-05-09

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