JPS5639566A - Electrophotographic developing device - Google Patents

Electrophotographic developing device

Info

Publication number
JPS5639566A
JPS5639566A JP11482879A JP11482879A JPS5639566A JP S5639566 A JPS5639566 A JP S5639566A JP 11482879 A JP11482879 A JP 11482879A JP 11482879 A JP11482879 A JP 11482879A JP S5639566 A JPS5639566 A JP S5639566A
Authority
JP
Japan
Prior art keywords
bias
photoreceptor
power source
voltage
magnetic brush
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
JP11482879A
Other languages
Japanese (ja)
Inventor
Mitsuru Mamizuka
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 JP11482879A priority Critical patent/JPS5639566A/en
Publication of JPS5639566A publication Critical patent/JPS5639566A/en
Pending legal-status Critical Current

Links

Landscapes

  • Developing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE: To prevent securely the surface of paper form staining in copying by detecting the existence of a photoreceptor by the magnitude of bias electric current and by applying a high bias voltage only when the photoreceptor exists.
CONSTITUTION: Opposite electrode 2 is provided at the opposite position of magnetic brush 1 and then applied with a bias. Then, photoreceptor 3 with a formed electrostatic latent image is sent between magnetic brush 1 and opposite electrode 2 by roller 4 and led to heat fixing roller 5. Bias electric power source control system 6, however, is put into operation only when detecting method 8 detects photoreceptor 3 reaching magnetic brush 1 by a change in bias voltage or electric current. For example, bias electric power source control system 6 consists of about 20V low- voltage power source 7l and about 200V voltage power source 7h mutually connected in parallel, electric current detecting method 8 that detects the bias current, and comparators 9a and 9b connected between the method and voltage source 7h.
COPYRIGHT: (C)1981,JPO&Japio
JP11482879A 1979-09-07 1979-09-07 Electrophotographic developing device Pending JPS5639566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11482879A JPS5639566A (en) 1979-09-07 1979-09-07 Electrophotographic developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11482879A JPS5639566A (en) 1979-09-07 1979-09-07 Electrophotographic developing device

Publications (1)

Publication Number Publication Date
JPS5639566A true JPS5639566A (en) 1981-04-15

Family

ID=14647697

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11482879A Pending JPS5639566A (en) 1979-09-07 1979-09-07 Electrophotographic developing device

Country Status (1)

Country Link
JP (1) JPS5639566A (en)

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