JPS54109846A - Magnetic brush developing device - Google Patents

Magnetic brush developing device

Info

Publication number
JPS54109846A
JPS54109846A JP1640678A JP1640678A JPS54109846A JP S54109846 A JPS54109846 A JP S54109846A JP 1640678 A JP1640678 A JP 1640678A JP 1640678 A JP1640678 A JP 1640678A JP S54109846 A JPS54109846 A JP S54109846A
Authority
JP
Japan
Prior art keywords
developer
sleeve
developing
drum
supplied
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
JP1640678A
Other languages
Japanese (ja)
Inventor
Takeshi Iijima
Shunji Kato
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 JP1640678A priority Critical patent/JPS54109846A/en
Publication of JPS54109846A publication Critical patent/JPS54109846A/en
Pending legal-status Critical Current

Links

Landscapes

  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE: To reduce the degradation of photosensitive drum and developer and prevent the deposition of unnecessary toner on the drum by preventing the developer from being supplied onto a developer conveying member when developing is not being actually done.
CONSTITUTION: A shield member 8 for developer is fixed and disposed near a developing sleeve 3 and is formed in the plate form body extending parallel with the developing sleeve. A doctor blade 9 is attached thereto. On the other hand, developing magnets 4, 4a disposed in the sleeve are so supported as to be able to turn in the specified angle range and are so arranged as to occupy the first position like (a) and the second position like (b). Hence, when the developing magnets 4, 4a are in the first position, the magnet 4a positioned in the lower part is apart from the bottom end of the shield member 8 and therefore even if the sleeve ritates, the developer 5 is not supplied to the peripheral surface of the sleeve and it turns out that in the second position the developer is continuously supplied to the peripheral surface of the sleeve. Thereby, the degradation of the drum and developer may be reduced.
COPYRIGHT: (C)1979,JPO&Japio
JP1640678A 1978-02-17 1978-02-17 Magnetic brush developing device Pending JPS54109846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1640678A JPS54109846A (en) 1978-02-17 1978-02-17 Magnetic brush developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1640678A JPS54109846A (en) 1978-02-17 1978-02-17 Magnetic brush developing device

Publications (1)

Publication Number Publication Date
JPS54109846A true JPS54109846A (en) 1979-08-28

Family

ID=11915351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1640678A Pending JPS54109846A (en) 1978-02-17 1978-02-17 Magnetic brush developing device

Country Status (1)

Country Link
JP (1) JPS54109846A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834469A (en) * 1981-08-25 1983-02-28 Toshiba Corp Magnetic brush device
JPS60239771A (en) * 1984-05-14 1985-11-28 Toshiba Corp Image forming device
JPS60239772A (en) * 1984-05-14 1985-11-28 Toshiba Corp Image forming device
JPH01101261U (en) * 1987-12-26 1989-07-07
JP2004101930A (en) * 2002-09-10 2004-04-02 Ricoh Co Ltd Image forming apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834469A (en) * 1981-08-25 1983-02-28 Toshiba Corp Magnetic brush device
JPS60239771A (en) * 1984-05-14 1985-11-28 Toshiba Corp Image forming device
JPS60239772A (en) * 1984-05-14 1985-11-28 Toshiba Corp Image forming device
JPH01101261U (en) * 1987-12-26 1989-07-07
JP2004101930A (en) * 2002-09-10 2004-04-02 Ricoh Co Ltd Image forming apparatus

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