Image forming device including secondary transfer counter...

Details Image forming device including secondary transfer counter... Image forming device including secondary transfer counter...

2007-06-26

2007-06-26

Gray, David M. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

C399S044000, C399S045000, C399S302000, C399S308000

Reexamination Certificate

active

11192820

ABSTRACT:
In an image forming apparatus a primary transfer is carried out such that toner images on a plurality of photoreceptors are transferred and laminated onto an intermediate transfer member, and a recording paper and the intermediate transfer member are sandwiched between a secondary transfer roller disposed so as to be in contact with the intermediate transfer member and a secondary transfer counter roller disposed opposite to the secondary transfer roller, to carry out a secondary transfer that the toner images on the intermediate transfer member are transferred onto the recording paper. At the time, an electric field is applied to the recording paper, and further the secondary transfer counter roller is switched by a switch between grounded state and floating state so that a potential difference between the intermediate transfer member and the secondary transfer roller can be adjusted.

REFERENCES:
patent: 5565975 (1996-10-01), Kumon et al.
patent: 6253037 (2001-06-01), Park
patent: 6421521 (2002-07-01), Tanaka
patent: 05-333723 (1993-12-01), None
patent: 08-101590 (1996-04-01), None
patent: 2001-296759 (2001-10-01), None
patent: 2002-108111 (2002-04-01), None

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