Image forming apparatus provided with contact-type charger and c

Details Image forming apparatus provided with contact-type charger and c Image forming apparatus provided with contact-type charger and c

1997-12-24

1999-02-16

Beatty, Robert

Electrophotography

Internal machine environment

Particle or contaminant control

399174, G03G 1502

Patent

active

058730133

ABSTRACT:
A charging member is disposed so as to contact a surface of a charge-receiving member which moves relative to the charging member. In conjunction with the movement of the charge receiving member, the charging member removes foreign substance present on the charge-receiving member on the upstream side in the direction of travel of the charge-receiving member at the contact region with the charging member. Simultaneously, a discharge voltage is applied to the charging member so that the charging member charges the charge-receiving member in the area from which said foreign substance has been removed at the contact region on the downstream side of the charge-receiving member in the direction of travel of the charge-receiving member. During a cleaning operation, the charging member retracts from the charge-receiving member and is out of contact therewith in accordance with the number of image formations, black and white ratio, and humidity. The removed foreign substance passes by said charging member in conjunction with the movement of the charge-receiving member.

REFERENCES:
patent: 3904929 (1975-09-01), Kanaya et al.
patent: 5192974 (1993-03-01), Ikegawa et al.
patent: 5278614 (1994-01-01), Ikegawa et al.
patent: 5376995 (1994-12-01), Yamamoto et al.
patent: 5402213 (1995-03-01), Ikegawa et al.
patent: 5557375 (1996-09-01), Nagayasu et al.
patent: 5572293 (1996-11-01), Kikuchi et al.
patent: 5629755 (1997-05-01), Ohtsuka
patent: 5655188 (1997-08-01), Nagamori et al.
patent: 5697020 (1997-12-01), Sato et al.

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