Method for preventing contamination of photosensitive drum

Details Method for preventing contamination of photosensitive drum Method for preventing contamination of photosensitive drum

1998-05-07

1999-09-28

Grimley, Arthur T.

Electrophotography

Machine operation

Electrical connection

G03G 1500

Patent

active

059602350

ABSTRACT:
A method for preventing contamination of a photosensitive drum in an image forming apparatus. To prevent contamination, the apparatus cuts off a ground path between the photosensitive drum and ground upon receiving an initial print command, until an initial area of the photosensitive drum, which initially contacts the charging roller, reaches a developing position where the photosensitive drum contacts a developing roller. After the initial area has reached the developing position, the apparatus connects the photosensitive drum to ground. In this way, the surface of the photosensitive drum does not have an electric potential so that toner is not transferred to the photosensitive drum until the uncharged area reaches the developing position or the area which is exposed during the initialization of the exposure unit reaches the developing position.

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