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GB1231868A - - Google Patents

Info

Publication number
GB1231868A
GB1231868A GB1231868DA GB1231868A GB 1231868 A GB1231868 A GB 1231868A GB 1231868D A GB1231868D A GB 1231868DA GB 1231868 A GB1231868 A GB 1231868A
Authority
GB
United Kingdom
Prior art keywords
electrode
image
potential
particles
toner particles
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
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 filed Critical
Publication of GB1231868A publication Critical patent/GB1231868A/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
    • G03G15/082—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer for immersion
    • 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
    • Y10S222/00—Dispensing
    • Y10S222/01—Xerography

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

1,231,868. Xerographic developing apparatus. RANK XEROX Ltd. Aug. 6, 1968 [Aug. 9, 1967], No.37506/68. Heading G2H. A xerographic development apparatus has a support 20 for maintaining developer, comprising carrier particles and charged toner particles, adjacent a surface bearing a latent electrostatic image and means to vibrate the support to suspend the developer in a fluidized state in contact with the image, and an apertured development electrode in proximity to the image and biased to the same polarity as the image. An assembly 14, oscillated by a motor 24 through a link 26, has a support plate 20 as described in Specification 1,193,443. Oscillation of the assembly 14 causes developer to become fluidized in development zone 22. Developer can flow freely through a development electrode 28 in the form of a mesh screen. A screen electrode 30 supports a quantity of developer adjacent the image surface. The mesh of the screen is such that toner particles may flow freely, but not carrier particles. A sump 32 beneath the electrode 30 contains developer having an excess quantity of toner particles. During operation, vibrations of the assembly cause charged toner particles to rise through electrode 30. A variable potential 38 maintains electrode 28 at potential slightly above the potential of the non-image areas, e.g. 100 volts positive, while a second variable potential 40 maintains the electrode 30 at a higher potential than the electrode 28, e. g. 4, 000 volts positive. Negatively charged toner particles are repelled by the electrode 28 to prevent particles not associated with carrier particles from entering zone 22. Carrier particles not carrying toner attract toner particles. Thus, toner particles are continuously conveyed from the sump by carrier particles to the image surface. The potentials 38, 40 can be varied to control image density. In a modification, the electrode 30 is replaced by an undulating screen(42) Fig. 2 (not shown) with insulating caps (44) which prevent the upward passage of uncharged toner particles. In another modification, a potential (40) Fig. (not shown) is applied between electrode wires (52) and plate (20), while a potential (38) is applied between the wires (52) and the substrate of the image surface. An insulating screen (54) is apertured to allow the passage of toner but not carrier particles.
GB1231868D 1967-08-09 1968-08-06 Expired GB1231868A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US659519A US3396700A (en) 1967-08-09 1967-08-09 Xerographic toner dispensing apparatus

Publications (1)

Publication Number Publication Date
GB1231868A true GB1231868A (en) 1971-05-12

Family

ID=24645729

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1231868D Expired GB1231868A (en) 1967-08-09 1968-08-06

Country Status (4)

Country Link
US (1) US3396700A (en)
JP (1) JPS4916651B1 (en)
DE (1) DE1797065A1 (en)
GB (1) GB1231868A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010725A1 (en) * 1978-10-31 1980-05-14 Agfa-Gevaert AG Process and device for the electrophoretic development of electrostatically charged recording carriers

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3545968A (en) * 1966-12-24 1970-12-08 Fuji Photo Film Co Ltd Developing a latent electrostatic image with ferromagnetic carrier and toner by employing a varying magnetic field
US3790397A (en) * 1969-09-15 1974-02-05 Xerox Corp Retoning carrier beads in the development zone
US3648658A (en) * 1969-09-15 1972-03-14 Xerox Corp Developing apparatus
US3654900A (en) * 1970-09-17 1972-04-11 Xerox Corp Fluidized development of electrostatic images
US3754531A (en) * 1971-07-14 1973-08-28 Xerox Corp Fluidized development apparatus
BE791193A (en) * 1971-11-11 1973-05-10 Xerox Corp XEROGRAPHIC DEVELOPMENT DEVICES
US3894514A (en) * 1973-12-20 1975-07-15 Ibm Toner recovery system
US5229823A (en) * 1992-01-30 1993-07-20 Eastman Kodak Company Toner agitator system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2784109A (en) * 1950-09-18 1957-03-05 Haloid Co Method for developing electrostatic images
US3263234A (en) * 1961-10-04 1966-07-26 Burroughs Corp Apparatus and method of electrostatic recording
NL702000A (en) * 1963-02-01
US3202093A (en) * 1963-02-11 1965-08-24 Electrostatic Printing Corp Electrostatic printing
US3295440A (en) * 1964-05-27 1967-01-03 Continental Can Co Electrostatic printing method and apparatus employing corona discharge means
US3306193A (en) * 1964-09-14 1967-02-28 Continental Can Co Electrostatic screen printing with magnetic conveyer and moving base electrode
US3357403A (en) * 1967-01-03 1967-12-12 Xerox Corp Powder cloud development apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010725A1 (en) * 1978-10-31 1980-05-14 Agfa-Gevaert AG Process and device for the electrophoretic development of electrostatically charged recording carriers

Also Published As

Publication number Publication date
JPS4916651B1 (en) 1974-04-24
US3396700A (en) 1968-08-13
DE1797065A1 (en) 1971-07-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees