JPS56138761A - Magnetic brush developing device - Google Patents

Magnetic brush developing device

Info

Publication number
JPS56138761A
JPS56138761A JP18164480A JP18164480A JPS56138761A JP S56138761 A JPS56138761 A JP S56138761A JP 18164480 A JP18164480 A JP 18164480A JP 18164480 A JP18164480 A JP 18164480A JP S56138761 A JPS56138761 A JP S56138761A
Authority
JP
Japan
Prior art keywords
sleeve
developing
developing powder
hopper
powder
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.)
Pending
Application number
JP18164480A
Other languages
Japanese (ja)
Inventor
Takashi Yano
Mitsuo Shibusawa
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
Priority to JP18164480A priority Critical patent/JPS56138761A/en
Publication of JPS56138761A publication Critical patent/JPS56138761A/en
Pending 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
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0856—Detection or control means for the developer level
    • 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
    • G03G15/0856—Detection or control means for the developer level
    • G03G15/0862—Detection or control means for the developer level the level being measured by optical means

Abstract

PURPOSE:To correctly detect the residual amount of the developer by providing a light emitting element and a photodetector within the range where the magnetic force of a magnet acts from the developing sleeve surface, near the opening part of a hopper for supplying developing powder to the developing sleeve. CONSTITUTION:The developing powder 6 in a hopper 5 is supplied from the opening part 5a in the lower part of a hopper 5 onto the developing sleeve surface. The developing powder 6 is attracted on the rotating sleeve by the magnetic force of the magnet 2 in the sleeve 1, and the amount of its pickup is regulated by the tip of a partition plate 3a. The developing powder on the sleeve 1 contacts the photosensitive drum surface in the position where the sleeve 1 approaches the nearest the photosensitive drum 4, thereby developing the electrostatic latent image on the photoreceptor. When the developing powder 6 in the hopper decreases gradually upon repetition of development, the developing powder which had fallen in the recess 3c of the back plate 3b is swept to the sleeve side by the magnetic force of the approaching magnetic pole and the quantity of the light from the light emitting element 9 crossing this recess increases as well and is captured as a change in current by the photodetector 9, whereby the residual amount of the developing powder is detected.
JP18164480A 1980-12-22 1980-12-22 Magnetic brush developing device Pending JPS56138761A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18164480A JPS56138761A (en) 1980-12-22 1980-12-22 Magnetic brush developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18164480A JPS56138761A (en) 1980-12-22 1980-12-22 Magnetic brush developing device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP52144482A Division JPS5946391B2 (en) 1977-11-30 1977-11-30 magnetic brush developing device

Publications (1)

Publication Number Publication Date
JPS56138761A true JPS56138761A (en) 1981-10-29

Family

ID=16104346

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18164480A Pending JPS56138761A (en) 1980-12-22 1980-12-22 Magnetic brush developing device

Country Status (1)

Country Link
JP (1) JPS56138761A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0600665A1 (en) * 1992-11-30 1994-06-08 Mita Industrial Co. Ltd. Image forming machine equipped with an exchangeable developing unit
EP0682297A3 (en) * 1994-05-12 1996-08-21 Brother Ind Ltd Developing device having detachable toner box for use in image recording apparatus.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5476237A (en) * 1977-11-30 1979-06-18 Ricoh Co Ltd Magnetic brush developing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5476237A (en) * 1977-11-30 1979-06-18 Ricoh Co Ltd Magnetic brush developing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0600665A1 (en) * 1992-11-30 1994-06-08 Mita Industrial Co. Ltd. Image forming machine equipped with an exchangeable developing unit
US6163660A (en) * 1992-11-30 2000-12-19 Kyocera Mita Corporation Image-forming machine equipped with an exchangeable developing unit
EP0682297A3 (en) * 1994-05-12 1996-08-21 Brother Ind Ltd Developing device having detachable toner box for use in image recording apparatus.

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