Transfer unit of electrophotographic image forming appraratus

Details Transfer unit of electrophotographic image forming appraratus Transfer unit of electrophotographic image forming appraratus

2006-02-14

2006-02-14

Tran, Hoan (Department: 2852)

Electrophotography

Image formation

Transfer

C399S121000

Reexamination Certificate

active

06999709

ABSTRACT:
A transfer unit of an electrophotographic image forming apparatus. The transfer unit includes a transfer belt which is rotated while contacting a photosensitive drum, a driving assembly having a driving roller supported by a plurality of main frames to rotate the transfer belt, and a steering roller portion supported by the plurality of main frames and which pushes the transfer belt to tighten the transfer belt. The apparatus further includes a transfer backup roller assembly having a plurality of transfer backup rollers which are installed inside the transfer belt to support a plurality of auxiliary frames and support the transfer belt, and a plurality of guide rollers supported by the plurality of auxiliary frames and to guide the transfer belt, and a transfer backup roller ascending and descending portion which ascends and descends the transfer backup roller assembly towards the driving assembly.

REFERENCES:
patent: 6453135 (2002-09-01), Sameshima et al.
patent: 6463236 (2002-10-01), Morikami et al.
patent: 6484003 (2002-11-01), Tokutake et al.

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