Transfer roller with voltage polarity control

Details Transfer roller with voltage polarity control Transfer roller with voltage polarity control

1991-03-15

1993-01-26

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355219, 355274, G03G 1516

Patent

active

051826046

ABSTRACT:
An image forming apparatus includes an image bearing member movable along an endless path, an image forming system for forming a toner image on the image bearing member, and a transfer device for transferring the toner image from the image bearing member to a transfer material at a transfer position. The image forming system includes a charger for charging the image bearing member, and a developer. The transfer device includes a transfer member contactable to a backside of the transfer material. The transfer member is supplied with a voltage having a polarity which is the same as the charging polarity of the toner during a developing operation to transfer the toner from the transfer member to the image bearing member when the transfer material is absent at the transfer position. Also provided is a device for causing a region of the image bearing member to have a potential of the same polarity as the charging polarity of the charger before the region is charged by the charger for image formation.

REFERENCES:
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patent: 4412732 (1983-11-01), Ogata et al.
patent: 4674860 (1987-06-01), Tokunaga et al.
patent: 4719489 (1988-01-01), Ohkubo et al.
patent: 4843423 (1989-06-01), Nakamura et al.
patent: 5006902 (1991-04-01), Araya
patent: 5034777 (1991-07-01), Ohzeki et al.

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