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WO1992010792A3 - Electrostatic image developer dispenser - Google Patents

Electrostatic image developer dispenser Download PDF

Info

Publication number
WO1992010792A3
WO1992010792A3 PCT/US1991/009120 US9109120W WO9210792A3 WO 1992010792 A3 WO1992010792 A3 WO 1992010792A3 US 9109120 W US9109120 W US 9109120W WO 9210792 A3 WO9210792 A3 WO 9210792A3
Authority
WO
WIPO (PCT)
Prior art keywords
opposite
pole
bar assembly
doctor blade
magnetic pole
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.)
Ceased
Application number
PCT/US1991/009120
Other languages
French (fr)
Other versions
WO1992010792A2 (en
Inventor
Todd A Kahle
Robert E Gunst
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.)
Infographix Inc
Original Assignee
Infographix Inc
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 Infographix Inc filed Critical Infographix Inc
Publication of WO1992010792A2 publication Critical patent/WO1992010792A2/en
Publication of WO1992010792A3 publication Critical patent/WO1992010792A3/en
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
    • 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
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0865—Arrangements for supplying new developer
    • 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
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0865—Arrangements for supplying new developer
    • G03G15/0875—Arrangements for supplying new developer cartridges having a box like shape
    • 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
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0877—Arrangements for metering and dispensing developer from a developer cartridge into the development unit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
  • Dry Development In Electrophotography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

An electrostatic image developer dispenser (10, 310) forms a uniformly thick and uniformly charged layer of developer particles on a transport surface (106) of a conveyor (50, 350) for delivering particles from a reservoir (22) to a development region (107) adjacent to a photoreceptor (100). A magnet bar assembly (70, 370) inside the tubular conveyor (50, 350) attracts particles to the transport surface (106) for conveyance to the development region (107). A magnetic doctor blade (110, 410) presents a surface (114, 414) parallel to the transport surface (106) to establish a regulating gap (116) between the doctor blade surface (114, 414) and the transport surface (106). The doctor blade (110, 410) extends in the transport direction (67) from opposite one pole (91, 393) of the magnet bar assembly (70, 370) toward an opposite pole (85, 387) downstream from the one pole (91, 393), to concentrate and orient the magnetic field in the particle layer formation area. As such, the doctor blade (110, 410) has a first induced magnetic pole at its periphery (114, 417) opposite from the first magnetic pole (91, 393) of the magnet bar assembly (70, 370) which is of an opposite polarity from the first magnetic pole (91, 393), and the doctor blade (110, 410) has a second induced magnetic pole at its periphery (419) closest to the second magnetic pole (85, 387) of the magnetic bar assembly (70, 370) which is of an induced polarity opposite from the polarity of its first induced magnetic pole. In one embodiment, the magnet bar assembly (70, 370) has a pole plate (90) opposite from the doctor blade surface (114) and angularly offset therefrom in a direction opposite to the transport direction (67). In another embodiment, the magnet bar assembly (370) has two pairs of opposed magnets (382, 389). A scraper blade (152) bears against the transport surface (106) to remove developer particles from the transport surface (106) after they have passed through the development region (107). A cleaning blade (126) is provided in the dispenser (10, 310) that bears against the photoreceptor (100) to remove developer particles therefrom upstream from the development region (107) and recycle the removed particles back into the reservoir (22).
PCT/US1991/009120 1990-12-14 1991-12-05 Electrostatic image developer dispenser Ceased WO1992010792A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US62767890A 1990-12-14 1990-12-14
US627,678 1990-12-14

Publications (2)

Publication Number Publication Date
WO1992010792A2 WO1992010792A2 (en) 1992-06-25
WO1992010792A3 true WO1992010792A3 (en) 1992-09-03

Family

ID=24515650

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/009120 Ceased WO1992010792A2 (en) 1990-12-14 1991-12-05 Electrostatic image developer dispenser

Country Status (1)

Country Link
WO (1) WO1992010792A2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2254537A1 (en) * 1971-11-12 1973-05-17 Ricoh Kk ELECTROPHOTOGRAPHIC DEVELOPMENT DEVICE
US3754526A (en) * 1971-12-17 1973-08-28 Ibm Electrophotographic development apparatus
US4244322A (en) * 1977-03-11 1981-01-13 Tokyo Shibaura Electric Co., Ltd. Magnetic brush type developing apparatus
US4941019A (en) * 1988-04-15 1990-07-10 Canon Kabushiki Kaisha Apparatus for developing electrostatic latent image
JPH06324269A (en) * 1993-05-14 1994-11-25 Canon Inc Attachment for pretreatment of microscope sample and method for producing fracture surface using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2254537A1 (en) * 1971-11-12 1973-05-17 Ricoh Kk ELECTROPHOTOGRAPHIC DEVELOPMENT DEVICE
US3754526A (en) * 1971-12-17 1973-08-28 Ibm Electrophotographic development apparatus
US4244322A (en) * 1977-03-11 1981-01-13 Tokyo Shibaura Electric Co., Ltd. Magnetic brush type developing apparatus
US4941019A (en) * 1988-04-15 1990-07-10 Canon Kabushiki Kaisha Apparatus for developing electrostatic latent image
JPH06324269A (en) * 1993-05-14 1994-11-25 Canon Inc Attachment for pretreatment of microscope sample and method for producing fracture surface using the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Vol 12, No 231, P723, & JP, A, 6324269 (MINOLTA CAMERA CO. LTD) 1 February 1988, see detail 4a *

Also Published As

Publication number Publication date
WO1992010792A2 (en) 1992-06-25

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