Fixing unit having heating roller and pressure roller

Details Fixing unit having heating roller and pressure roller Fixing unit having heating roller and pressure roller

1994-05-24

1996-01-23

Brase, Sandra L.

Photocopying

Contact printing

Light boxes

355282, 355285, G03G 1520

Patent

active

054869080

ABSTRACT:
A fixing unit is included in a image forming apparatus, and includes a heating roller and a pressure roller. A separating layer is formed on a surface of the heating roller, and an elastic member layer is formed on a surface of the pressure roller, and both are brought into pressure-contact with each other in a state where the elastic member layer is in elastic deformation. The heating roller and the pressure roller are rotatably supported at fixed positions by bearings, respectively. At this time L=D1/2+D2/2-B.sup.2 /4 (1/D1+1/D2), where D1 is a diameter of the heating roller, D2 is a diameter of the pressure roller, B is nip width between the rollers, and L is a center distance between the rollers is satisfied.

REFERENCES:
patent: Re33770 (1991-12-01), Torino et al.
patent: 4163892 (1979-08-01), Komatsu et al.
patent: 5124755 (1992-06-01), Hediger
patent: 5177552 (1993-01-01), Isogai et al.
patent: 5239349 (1993-08-01), Hoover et al.
patent: 5287156 (1994-02-01), Shikada et al.
patent: 5345301 (1994-09-01), Satoh et al.

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