Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1979-07-05
1981-05-26
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
1525652, 355 3R, G03G 2100
Patent
active
042695031
ABSTRACT:
A toner cleaning apparatus for use in an electrophotographic apparatus having a rotatable photosensitive drum, a corona charger for uniformly charging or electrifying the photosensitive drum, an optical system for projecting an image of a document to be duplicated to form an electrostatic latent image, a biased magnet roller type developing device for developing the latent image with a dry toner to form a toned image, a rotatable transfer roller for transferring the toner image onto a record paper which is synchronously fed between the drum and the roller, and a fixing device for fixing the toner image onto the record paper. A first exclusive cleaning device such as brush type and blade type cleaners are arranged between the transfer roller and the corona charger and a switching device for changing a bias voltage applied to the developing device cooperates therewith such that the developing device is selectively operated as a developing device and a second cleaning device. A control device selectively operates the first and second cleaning devices in such a manner that the second cleaning device is usually operative, while the first exclusive cleaning device is operative only when the developing device could not be used or is not suitable to be used as the second cleaning device.
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Braun Fred L.
Olympus Optical Co,. Ltd.
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