JPS54124732A - Magnetic brush developing device - Google Patents

Magnetic brush developing device

Info

Publication number
JPS54124732A
JPS54124732A JP3214578A JP3214578A JPS54124732A JP S54124732 A JPS54124732 A JP S54124732A JP 3214578 A JP3214578 A JP 3214578A JP 3214578 A JP3214578 A JP 3214578A JP S54124732 A JPS54124732 A JP S54124732A
Authority
JP
Japan
Prior art keywords
developing
thru
powders
developing sleeve
voltage
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
JP3214578A
Other languages
Japanese (ja)
Inventor
Nobuo Kasahara
Toshio Nakahara
Hidetoshi Yano
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 JP3214578A priority Critical patent/JPS54124732A/en
Publication of JPS54124732A publication Critical patent/JPS54124732A/en
Pending legal-status Critical Current

Links

Landscapes

  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE: To effectively perform color developing by disposing a plurality of developing powder containing vessels to a developing sleeve and specifying the voltage application to the developing sleeve.
CONSTITUTION: A magnetic brush developing device is constituted by a developing sleeve 51 and a plurality of developing units 52 thru 54, etc. disposed around this. The developing sleeve 41 is then connected to power sources E1, E2 via switches S1 thru S4, voltage varying devices R1 thru R3. The developing powders of yellow, magenta and cyan in developing powder containing vessels 60, 70 80 having been agitated with vane wheels 62, 72, 82 are attracted to supply sleeves 61, 71, 81 by the magnetic forces of magnets 66 thru 68, 76 thru 78, 86 thru 88 and are then attracted in brush form on the developing sleeve 51 by the magnetic forces of 56 thru 59. At the time of turning the charge images of a photosensitive drum 1 to powder images, the voltage of the same polarity as that of the photosensitive drum 1 is applied to the developing sleeve 51 by closing the switches S1 thru S3 at the supplying of the developing powders and the voltage of the opposite polarity is applied by closing the switch S4 at the recovering of the developing powders. Thereby, the supply and recovery of the developing powders is efficiently accomplished and the mixing of the developing powders with themselves is prevented.
COPYRIGHT: (C)1979,JPO&Japio
JP3214578A 1978-03-20 1978-03-20 Magnetic brush developing device Pending JPS54124732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3214578A JPS54124732A (en) 1978-03-20 1978-03-20 Magnetic brush developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3214578A JPS54124732A (en) 1978-03-20 1978-03-20 Magnetic brush developing device

Publications (1)

Publication Number Publication Date
JPS54124732A true JPS54124732A (en) 1979-09-27

Family

ID=12350722

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3214578A Pending JPS54124732A (en) 1978-03-20 1978-03-20 Magnetic brush developing device

Country Status (1)

Country Link
JP (1) JPS54124732A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4743938A (en) * 1984-10-16 1988-05-10 Canon Kabushiki Kaisha Color image forming apparatus
US4827869A (en) * 1986-09-30 1989-05-09 Kabushiki Kaisha Toshiba Single and multi-color developing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4743938A (en) * 1984-10-16 1988-05-10 Canon Kabushiki Kaisha Color image forming apparatus
US4827869A (en) * 1986-09-30 1989-05-09 Kabushiki Kaisha Toshiba Single and multi-color developing apparatus

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