Transfer belt unit and image forming apparatus using the same

Details Transfer belt unit and image forming apparatus using the same Transfer belt unit and image forming apparatus using the same

2011-03-29

2011-03-29

Gray, David M (Department: 2852)

Electrophotography

Image formation

Transfer

C399S121000, C399S299000, C399S302000

Reexamination Certificate

active

07917071

ABSTRACT:
An image forming apparatus includes a transfer belt unit which has an intermediate transfer belt for supporting toner images and primary transfer rollers for pressing the intermediate transfer belt against corresponding photoreceptor drums and moves the intermediate transfer belt along the surface of each photoreceptor drum to transfer the toner images to the intermediate transfer belt. The intermediate transfer belt is formed so as to be 30 μm to 50 μm in average thickness, each primary transfer roller is arranged at a position, along the moving direction of the intermediate transfer belt, which is deviated downstream with respect to the moving direction from the position where the intermediate transfer belt is in contact with the photoreceptor and which is projected toward the photoreceptor drum side so as to press the intermediate transfer belt against photoreceptor with a nip pressure ranging from 10 gf/cm2to 40 gf/cm2.

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