Electrophotographic printer and fixing unit controlling apparatu

Details Electrophotographic printer and fixing unit controlling apparatu Electrophotographic printer and fixing unit controlling apparatu

1998-11-24

2000-01-11

Grimley, Arthur T.

Electrophotography

Control of electrophotography process

Control of fixing

399 45, G03G 1520

Patent

active

060145315

ABSTRACT:
A fixing unit has a heat roller with a heater element built therein, a pressure roller disposed to oppose the heat roller and holds and advances a print medium therebetween in sandwiched relation. A thermistor is in contact with the heat roller and detects the temperature of the heat roller. Another thermistor detects the temperature of the pressure roller. A control circuit controls energization of the heater element so as to maintain the temperature of the heat roller to a target temperature. The heater element is energized to maintain a constant value of Tc given by an equation Tc=Th+k.multidot.Tp where Th is a surface temperature of the heat roller, Tp is a surface temperature of the pressure roller, and k is a coefficient having the range of 0<k<1.

REFERENCES:
patent: 4905051 (1990-02-01), Satoh et al.
patent: 5321481 (1994-06-01), Mathers
patent: 5555075 (1996-09-01), Fukano et al.

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