Fixing apparatus having pressing members

Details Fixing apparatus having pressing members Fixing apparatus having pressing members

1996-05-24

1998-04-07

Ramirez, Nestor R.

Electrophotography

Image formation

Fixing

399330, 399331, G03G 1520

Patent

active

057376794

ABSTRACT:
A fixing apparatus has two backup rollers which rotate while remaining in contact with the circumference of a pressing roller, and a plurality of roller bearings for pressing the pressing roller against a heating roller via the backup rollers. The roller bearings are set so as to forcefully press the portion in the vicinity of the center of the pressing roller compared to the portions around both ends of the pressing roller, via the backup roller. As a result, a pressing force acting between the pressing roller and the heating roller becomes substantially even in the axial direction of them, thereby resulting in an even nipping width. Further, the fixing apparatus may be provided with a cylindrical rotary pressing member and a substantially cylindrical pressed-contact member which is disposed in the rotary pressing member and presses it against the heating roller. The pressed-contact member may be formed so as to have a larger diameter at the center than at both ends thereof.

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