Image forming apparatus

Details Image forming apparatus Image forming apparatus

2008-12-05

2011-11-01

Gray, David (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

C399S297000

Reexamination Certificate

active

08050582

ABSTRACT:
In a black monochromatic mode, an intermediary transfer belt is separated from an upstream photosensitive drum in a state in which a downstream photosensitive drum contacts the intermediary transfer belt. At this time, a stretching roller is moved upwardly in interrelation with a contact-separation mechanism to increase an angle of contact of the intermediary transfer belt with the downstream photosensitive drum compared with the case of a full-color mode. On the other hand, in the full-color mode, the stretching roller is moved downwardly to be separated from an inner surface of the intermediary transfer belt.

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