Thermal fixing device with heater operation diagnosing function

Details Thermal fixing device with heater operation diagnosing function Thermal fixing device with heater operation diagnosing function

2005-11-15

2005-11-15

Beatty, Robert (Department: 2852)

Electrophotography

Diagnostics

Fixing

C399S334000

Reexamination Certificate

active

06965741

ABSTRACT:
A thermal fixing device is equipped with a plurality of heaters for heating a fixing member at different axial positions thereof for proper temperature control. When the difference between the center temperature TAand the end temperature TBexceeds a proper temperature difference range (15° C.), of the center temperature TAand the end temperature TB, the one nearer to the average temperature Tmof the fixing upper limit temperature Thand the fixing lower limit temperature T1. is selected. The control value for the farther halogen lamp is changed so as to approach the selected temperature. When the temperature difference is 10° C. or less, the control value is further changed. With this process, it is possible to set both the temperatures and the portion near the center of the thermal roller to temperatures within the proper temperature range.

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