Fusing device, a heating device, and a method for fusing a toner

Details Fusing device, a heating device, and a method for fusing a toner Fusing device, a heating device, and a method for fusing a toner

1996-05-30

1997-09-23

Lee, S.

Electrophotography

Image formation

Fixing

219216, G03G 1520

Patent

active

056714734

ABSTRACT:
A fusing device has a pair of fusing rollers of which at least one is covered by an elastically deformable layer of heat resistant material with the fusing rollers being brought into contact with each other; a recording material guide member and a pre-heating member having a plane-shaped heating surface opposite to the recording material guide member on an upstream side recording material which maintains a toner image away of a nip portion where the fusing roller make contact. While the recording material which maintains the toner image is guided on said recording material guide member, the toner image is heated by means of the pre-heating member and passed through the nip portion. The fusing device is set to satisfy the relationship of 0<F<0.5.theta..sup.2 +0.05.theta. for an angle .theta.(.degree.) formed by a straight line connecting the nip portion with the edge of the recording material insertion side of the pre-heating member in the vertical plane on the rotating axis of the pair of fusing rollers and a straight line connecting the nip portion with the edge of the recording material insertion side of the recording material guide member as well as for a combined force F (kg).

REFERENCES:
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patent: 5027160 (1991-06-01), Okada et al.
patent: 5053829 (1991-10-01), Field et al.
patent: 5164782 (1992-11-01), Nagayama et al.
patent: 5465146 (1995-11-01), Higashi et al.
patent: 5521688 (1996-05-01), Moser

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