Sheet nipping mechanism and image forming apparatus with same

Details Sheet nipping mechanism and image forming apparatus with same Sheet nipping mechanism and image forming apparatus with same

2007-03-06

2007-03-06

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Fixing

Reexamination Certificate

active

10843857

ABSTRACT:
A sheet nipping mechanism is applied to an image forming apparatus and has a transfer belt for transporting a sheet having a toner image through a photosensitive drum. A fixing roller and a pressure roller are downstream of the transfer belt and are vertically aligned in a paired manner to define a nip zone therebetween for nipping the sheet. A guide is disposed between the nip zone and the downstream end of the transfer belt. The fixing roller has a reverse-crown shape whose diameter is gradually reduced in a direction extending from each of the opposite transverse ends to the central region of the fixing roller. The guide has an edge opposed to the nip zone and is formed in a crown shape conformable to the reverse-crown shape. The sheet nipping mechanism prevents crimples and bouncing of sheet in the nip zone.

REFERENCES:
patent: 2002/0131801 (2002-09-01), Tomatsu
patent: 2004/0146323 (2004-07-01), Fujisawa et al.
patent: 61047978 (1986-03-01), None
patent: 06138786 (1994-05-01), None
patent: 9-114292 (1997-05-01), None
patent: 2000-293060 (2000-10-01), None

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