Electrophotographic apparatus having means for avoiding blurring

Details Electrophotographic apparatus having means for avoiding blurring Electrophotographic apparatus having means for avoiding blurring

1989-09-11

1991-11-19

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118652, G03G 1506

Patent

active

050669885

ABSTRACT:
An electrophotographic apapratus which avoids blurred and tainted images caused by toner being heated during idle periods by a heated photosensitive drum. In one aspect a developing roller is separated from the drum during the idle periods. In another aspect toner is forcibly removed from the developing roller by application of a reverse bias voltage during the interval between turning on a main switch and the time at which copying becomes possible.

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patent: 4801966 (1989-01-01), Ikeda
patent: 4814816 (1989-03-01), Idenawa
patent: 4862219 (1989-08-01), Yoshida et al.
patent: 4870447 (1989-09-01), Yoshida et al.

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