Image forming apparatus

Details Image forming apparatus Image forming apparatus

2004-04-09

2008-08-26

Yan, Ren (Department: 2854)

Electrophotography

Document handling

Copy

C399S404000, C271S225000, C271S285000, C271S286000

Reexamination Certificate

active

07418234

ABSTRACT:
A discharge unit is disposed downstream of a principal transport path of a compound machine, and a shifter function is provided in this discharge unit. By shifting the paper passage position relative to a photosensitive drum when printing the front side and the paper passage position relative to the photosensitive drum when printing the back side, the region in which the surface electric potential of the photosensitive drum increases is diminished, and the region in which photographic fog is generated is made smaller. Thus, when printing the second and subsequent sheets, even when a slight amount of displacement of the transport position of the recording paper occurs, it is possible to suppress that recording paper making contact in the photographic fog region on the photosensitive drum, and defective printing can be prevented.

REFERENCES:
patent: 5162857 (1992-11-01), Higeta et al.
patent: 6424365 (2002-07-01), Kimoto
patent: 2-18242 (1990-01-01), None
patent: 4-208949 (1992-07-01), None
patent: 2002-23576 (2002-01-01), None
patent: 2002-333748 (2002-11-01), None

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