Electrophotography – Control of electrophotography process – Control of fixing
Patent
1994-12-07
1997-12-23
Beatty, Robert
Electrophotography
Control of electrophotography process
Control of fixing
399330, G03G 1520
Patent
active
057015562
ABSTRACT:
A thermal fixing device for rising a temperature of a heat roller up to a designated temperature in a short time and a color image forming apparatus using this device. This thermal fixing device comprises a heat roller having a heat source and positioned on the side of a toner image on a recording medium to fix the toner image; a pressurizing member, positioned opposite to the side of the toner image on the recording medium, for pushing the recording medium against the heat roller; a temperature sensor for detecting a temperature of the heat roller; and a control circuit for controlling the heat source of the heat roller by comparing a detected temperature of the temperature sensor with a set temperature, sequentially stepwise increasing the set temperature up to the designated temperature when starting the operation of the device and, at the same time, controlling a generated energy of a plurality of heat sources to sequentially decrease the generated energy thereof. The heat roller includes an elementary tube accommodating a heat source, a rubber member provided along the periphery of the elementary tube, and a heat emission prevention member covering the ends of the tube. The temperature sensor is provided in a position for detecting a temperature of this elementary tube. The heat emission prevention member is formed with a plurality of air holes.
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Beatty Robert
Fujitsu Limited
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