Photocopying – Contact printing – Light boxes
Patent
1992-06-03
1994-04-05
Grimley, A. T.
Photocopying
Contact printing
Light boxes
219216, 219470, 355282, G03G 1520
Patent
active
053009967
ABSTRACT:
A fixing apparatus for fixing an image on a record sheet comprises a fixing roller in which a heater is disposed, a pressing roller urged against the fixing roller, heat pipes extending in either one of the fixing and pressing rollers in a longitudinal direction thereof, and a temperature detection / control device for detecting to control a temperature of the fixing roller. In a typical embodiment, the heat pipes are disposed in the fixing roller to extend both through an imaging portion, through which a record sheet passes, and through a non-imaging portion, through which no record sheet passes and the temperature detection / control device has a temperature detection device for detecting a temperature of the fixing roller in contact with the non-imaging portion. The temperature detection / control device is provided with a temperature regulating device for interrupting electricity to the heater when the fixing roller exceeds a predetermined temperature. In another embodiment, at least one of heat pipes is provided in the fixing roller in parallel with an axis of the fixing roller, and a core of the fixing roller is produced by extrusion.
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Arai Atsushi
Fukuchi Yutaka
Higaya Toshiaki
Okamoto Jun
Sato Masahiko
Grimley A. T.
Lee Shuk Y.
Ricoh & Company, Ltd.
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