Transfer bias control method for image forming apparatus...

Details Transfer bias control method for image forming apparatus... Transfer bias control method for image forming apparatus...

2006-06-06

2006-06-06

Grainger, Quana (Department: 2852)

Electrophotography

Control of electrophotography process

Responsive to copy media characteristic

Reexamination Certificate

active

07058322

ABSTRACT:
To prevent jamming with small-sized print materials without disturbing an image located at a trailing end of a print material, an image forming apparatus includes a photosensitive drum that carries a toner image, a transfer device which can apply a transfer bias to the transfer roller to transfer the toner image to a print material passing through the transfer nip portion, and a control device for controlling a transfer bias set value set in order to apply a predetermined transfer bias to the transfer roller. The control device switches a first transfer bias set value to a second bias set value smaller than the first transfer bias set value while the print material is passing through the transfer nip portion, in order to change the transfer bias applied to the transfer roller.

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