JPS6465584A - Developing device for copying machine - Google Patents

Developing device for copying machine

Info

Publication number
JPS6465584A
JPS6465584A JP22266287A JP22266287A JPS6465584A JP S6465584 A JPS6465584 A JP S6465584A JP 22266287 A JP22266287 A JP 22266287A JP 22266287 A JP22266287 A JP 22266287A JP S6465584 A JPS6465584 A JP S6465584A
Authority
JP
Japan
Prior art keywords
magnet body
protective film
developing device
service life
copying machine
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
JP22266287A
Other languages
Japanese (ja)
Inventor
Naotaka Funayama
Masatoshi Kaneshige
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP22266287A priority Critical patent/JPS6465584A/en
Priority to US07/237,870 priority patent/US4980728A/en
Publication of JPS6465584A publication Critical patent/JPS6465584A/en
Pending legal-status Critical Current

Links

Landscapes

  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE:To extend a service life of a magnet body by covering the whole surface of outside periphery of the magnet body, with a magnet body protective film. CONSTITUTION:When a developing roller 22 rotates clockwise B, a developer 2 which is adhered to a magnet body protective film 22a holds a spike rise state by magnetic force of magnets N, S, while being scraped by a scraping end 24a of a spike rise forming plate 24. In such a case, since the whole surface of a magnet body 21 is covered with a magnet body protective film 22a, the scraping end 24a comes into contact with the surface of the magnet body protective film 22a and does not come into contact with the magnet body 21, therefore, an abrasion of the magnet body 21 can be prevented. In such a way, the service life of the magnet body can be extended.
JP22266287A 1987-09-04 1987-09-04 Developing device for copying machine Pending JPS6465584A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP22266287A JPS6465584A (en) 1987-09-04 1987-09-04 Developing device for copying machine
US07/237,870 US4980728A (en) 1987-09-04 1988-08-29 Developing device with a magnetic brush turning plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22266287A JPS6465584A (en) 1987-09-04 1987-09-04 Developing device for copying machine

Publications (1)

Publication Number Publication Date
JPS6465584A true JPS6465584A (en) 1989-03-10

Family

ID=16785962

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22266287A Pending JPS6465584A (en) 1987-09-04 1987-09-04 Developing device for copying machine

Country Status (1)

Country Link
JP (1) JPS6465584A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52129526A (en) * 1976-04-23 1977-10-31 Hitachi Metals Ltd Electrostatic developing method and apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52129526A (en) * 1976-04-23 1977-10-31 Hitachi Metals Ltd Electrostatic developing method and apparatus

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