Electrophotographic printing device with a charging roller

Details Electrophotographic printing device with a charging roller Electrophotographic printing device with a charging roller

1997-03-04

1998-06-16

Brase, Sandra L.

Electrophotography

Control of electrophotography process

Control of charging

399 66, 399176, 399313, G03G 1502

Patent

active

057686530

ABSTRACT:
In an electrophotographic printing device, a charging roller for a photoconductive drum is constituted by an outer, resilient and resistive layer and by a conductive core connected to earth by means of an element with adjustable resistance. The charging roller is rotated and at the same time its outer layer is charged, by an auxiliary conductive roller which is in contact with the charging roller along a generatrix, with a specific surface charge which is discharged gradually through the resistive layer and the adjustable resistor according to a law determined by the value of the adjustable resistor so that the residual charge transferred by the charging roller to the drum can be controlled simply, reliably and repetitively, so as to adopt an optimal value.

REFERENCES:
patent: 3626260 (1971-12-01), Kimura et al.
patent: 5089851 (1992-02-01), Tanaka et al.
patent: 5119141 (1992-06-01), Bhagat
patent: 5144368 (1992-09-01), Ohzeki et al.
patent: 5321476 (1994-06-01), Gross
patent: 5412455 (1995-05-01), Ono et al.
patent: 5446615 (1995-08-01), Matsumoto et al.
patent: 5495317 (1996-02-01), Matsuda et al.
patent: 5678129 (1997-10-01), Yasuda et al.
Patent Abstracts of Japan, 95 (002) for Publication No.: JP7-049601, Publication Date: Feb. 21, 1995.

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