JPS57158863A - Developing device - Google Patents

Developing device

Info

Publication number
JPS57158863A
JPS57158863A JP4520581A JP4520581A JPS57158863A JP S57158863 A JPS57158863 A JP S57158863A JP 4520581 A JP4520581 A JP 4520581A JP 4520581 A JP4520581 A JP 4520581A JP S57158863 A JPS57158863 A JP S57158863A
Authority
JP
Japan
Prior art keywords
thickness
sleeve
magnetic
copy
toner layer
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
JP4520581A
Other languages
Japanese (ja)
Inventor
Takeshi Watanabe
Masahiro Goto
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP4520581A priority Critical patent/JPS57158863A/en
Publication of JPS57158863A publication Critical patent/JPS57158863A/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
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush

Abstract

PURPOSE:To prevent the variance of the density of a copy picture due to the difference of the developing time for variable magnification copy, by changing the thickness of a developer layer applied onto a sleeve in accordance with the variance of the process speed. CONSTITUTION:A nonmagnetic developing sleeve 1 faces to a photosensitive drum 6 while holding a slight gap between them and is rotated. In the sleeve, a toner layer thickness regulating member 4 and a magnetic roller 2 having magnetic poles N1 and S1 at least in parts facing to the photosensitive drum are provided. Though the speed of the photosensitive drum is changed for variable magnification, the thickness of the toner layer is made small at a contracting copy time because the process speed is lower than that at a nonmagnification copy time, and the thickness of the toner layer is made large at an anlarging copy time. The thickness of the toner layer is adjusted by adjusting the magnitude of the magnetic force of the magnetic pole N of the magnetic roller or the distance between a tonner layer thickness regulating member (magnetic blade) and the sleeve.
JP4520581A 1981-03-27 1981-03-27 Developing device Pending JPS57158863A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4520581A JPS57158863A (en) 1981-03-27 1981-03-27 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4520581A JPS57158863A (en) 1981-03-27 1981-03-27 Developing device

Publications (1)

Publication Number Publication Date
JPS57158863A true JPS57158863A (en) 1982-09-30

Family

ID=12712762

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4520581A Pending JPS57158863A (en) 1981-03-27 1981-03-27 Developing device

Country Status (1)

Country Link
JP (1) JPS57158863A (en)

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