Image forming apparatus having a charging member and a cleaning

Details Image forming apparatus having a charging member and a cleaning Image forming apparatus having a charging member and a cleaning

1991-04-26

1992-12-01

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355299, G03G 1502, G03G 2100

Patent

active

051683091

ABSTRACT:
An image forming apparatus includes a cleaning blade for cleaning a photosensitive member and a contact charging blade for charging the photosensitive member. The contact charging blade is contacted to the photosensitive member with a frictional coefficient which is smaller than the frictional coefficient at which the cleaning blade is contacted to the photosensitive member. The photosensitive member and the blades are protected from wearing and damage even if the contact charging blade is contacted to such a portion of the photosensitive member which is free from residual matter due to the function of the cleaning blade. In addition, the service life of the contact charging blade can be expanded to be substantially equal to that of the cleaning blade, and therefore, the present invention is particularly effective when both of the blades are provided in a process cartridge detachably mountable into a main assembly of the apparatus.

REFERENCES:
patent: 2892973 (1959-06-01), Straughan
patent: 3936183 (1976-02-01), Sadamatsu
patent: 3973845 (1976-08-01), Lindblad et al.
patent: 4026648 (1977-05-01), Takahashi
patent: 4264191 (1981-04-01), Gerbasi et al.
patent: 4387980 (1983-06-01), Ueno et al.
patent: 4469434 (1984-09-01), Yamazaki et al.
patent: 4527887 (1985-07-01), Vineski
patent: 4540268 (1985-09-01), Toyono et al.
patent: 4547060 (1985-10-01), Lindblad
patent: 4706320 (1987-11-01), Swift

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