Electrophotographic printing apparatus capable of printing image

Details Electrophotographic printing apparatus capable of printing image Electrophotographic printing apparatus capable of printing image

1994-03-23

1995-04-04

Picard, Leo P.

Photocopying

Contact printing

Light boxes

355246, 355274, G03G 1506

Patent

active

054042135

ABSTRACT:
To prevent spurious adherence of toner to the surface of a photosensitive drum during start-up of an electrophotographic printing apparatus, once rotation of the drum and charging of the drum surface to a predetermined potential are initiated, rotation of a developing roller to bring toner into contact with the drum surface is delayed until the charged portion of the drum surface has been rotated around to a position facing the developing roller. Applications of appropriately timed biasing voltages to the developing roller and an image transfer roller are also utilized to prevent spurious toner attraction to the surfaces of the drum and the transfer roller.

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patent: 5146601 (1992-09-01), Hosaka et al.
patent: 5155533 (1992-10-01), Kurokawa et al.
patent: 5161084 (1992-11-01), Morihara et al.
patent: 5164746 (1992-11-01), Nishioka
patent: 5164783 (1992-11-01), Taguchi et al.

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