Apparatus for forming image by developing charge latent image wi

Details Apparatus for forming image by developing charge latent image wi Apparatus for forming image by developing charge latent image wi

1983-06-09

1985-05-21

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, G03G 1508

Patent

active

045182477

ABSTRACT:
An electrophotographic copying machine having a photosensitive drum is disclosed. Around the drum there are arranged a corona charger for uniformly charging the drum, an optical system for projecting an image of a document onto the uniformly charged drum to form an electrostatic charge latent image, a magnetic brush developing device for developing the latent image with a two component dry developing agent to form a toner image, a transferring device for transferring the toner image onto a record paper to form a duplicated copy, and a cleaning blade for collecting a residual toner on the drum to form a toner accumulation. When the cleaning blade is separated from the drum, the toner accumulation on the drum is transported toward the developing device as the drum continues to rotate and is collected into the developing device for the recovery. The cleaning blade is separated from the drum at a timing determined by a length of record papers to be used. A continuous duplication can be performed efficiently.

REFERENCES:
patent: 3552850 (1971-01-01), Royka et al.
patent: 4111545 (1978-09-01), Meltzer
patent: 4140388 (1979-02-01), Ikesue
patent: 4145137 (1979-03-01), Sunaga et al.
patent: 4158498 (1979-06-01), Ohmori
patent: 4174172 (1979-11-01), Lane
patent: 4218132 (1980-08-01), Iwai et al.
patent: 4284345 (1981-08-01), Sugiyama et al.
patent: 4357098 (1982-11-01), Endo

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