Photocopying – Contact printing – Light boxes
Patent
1989-12-15
1991-09-24
Moses, R. L.
Photocopying
Contact printing
Light boxes
355210, G03G 1500
Patent
active
050517783
ABSTRACT:
An electrophotographic apparatus has its electrophotographic component parts divided into three units consisting essentially of a developing unit A, a photoreceptor unit B and a toner cartridge unit C. Each of the units is capable of being detached from and reattached to the main body of the apparatus while maintaining the required relative positions. The service lives of the units are set in such a manner that the ratio therebetween is represented as a ratio between integers, and the relationship therebetween in magnitude satisfies the relationship of the service life of the developing unit A.gtoreq.the service life of the photoreceptor unit B.gtoreq.the service life of the toner cartridge unit C. Thus, the apparatus enables its maintenance to be performed easily and economically without requiring any increase in the size and the cost of the electrophotographic mechanisms.
REFERENCES:
patent: 3689146 (1972-09-01), Ito et al.
patent: 3883242 (1975-05-01), Takahashi et al.
Fukasawa Jiro
Watanabe Hisao
Moses R. L.
Shindengen Electric Manufacturing Co. Ltd.
Yamanashi Electronics Co. Ltd.
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