Drum cleaning in an electrophotographic copying machine

Details Drum cleaning in an electrophotographic copying machine Drum cleaning in an electrophotographic copying machine

1982-02-26

1988-06-28

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

430125, G03G 2100

Patent

active

047543043

ABSTRACT:
An electrophotographic copying machine includes a combined developing-cleaning magnetic brush element for selectively conducting the developing operation and the cleaning operation. During the first revolution of the drum, a bias voltage of -200 V is applied to the combined developing-cleaning magnetic brush element to conduct the developing operation. During the second revolution of the drum, a bias voltage of +30 V or zero (0) volts is applied to the combined developing-cleaning magnetic brush element to attract the inversely charged residual toner from the drum surface. During the third revolution of the drum, the bias voltage of -200 V is again applied to the combined developing-cleaning magnetic brush element to attract the positively charged residual toner from the drum surface.

REFERENCES:
patent: 3647293 (1972-03-01), Queener
patent: 4142165 (1979-02-01), Miyakawa et al.
patent: 4183655 (1980-01-01), Umahashi et al.
patent: 4185910 (1980-01-01), Nomura et al.
patent: 4361922 (1982-12-01), Karal

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