Fixing unit for use in image forming apparatus

Details Fixing unit for use in image forming apparatus Fixing unit for use in image forming apparatus

1997-03-17

1998-07-28

Grimley, A. T.

Electrophotography

Diagnostics

Fixing

219216, 399 69, 399122, 399328, G03G 1520

Patent

active

057873194

ABSTRACT:
The invention provides a fixing device in which a temperature fuse melts quickly when a heat roller becomes overheated. The heat roller, to which pressure is applied by a pressure roller placed in a fixing unit case, is axially supported by bearings which are made of synthetic resin and soften upon overheating of the heat roller. An electrical insulating cover, placed adjacent the heat roller opposite to the position of the pressure roller is fixed to an inner surface of a lower case. The electrical insulating cover has a heat collecting surface which is arcuate in cross section and placed opposed to a circumferential surface of the heat roller. The temperature fuse is fixed to the reverse side of the cover and is connected in series with an electric circuit from a power source to a halogen lamp in the heat roller.

REFERENCES:
patent: 4541708 (1985-09-01), Shiegenobu
patent: 4696561 (1987-09-01), Katoh et al.
patent: 4875068 (1989-10-01), Pawlik et al.
patent: 5481350 (1996-01-01), Yasui et al.
patent: 5493379 (1996-02-01), Kuroda et al.
patent: 5528345 (1996-06-01), Hasegawa
patent: 5592276 (1997-01-01), Ohtsuka et al.

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