G - Physics – 03 – G
Patent
G - Physics
03
G
341/32.31, 314/3
G03G 15/20 (2006.01)
Patent
CA 1185313
"ABSTRACT" A temperature-sensitive element on a rotatable drum of a copying machine changes a characteristic in response to a temperature on said drum. The characteris- tic is employed to control a temperature signal. The temperature signal from the drum is connected to station- ary portions of the copying machine through sliding con- tacts. A control circuit responds to the temperature signal to control the energization of a heater to main- tain the temperature of the drum at a predetermined value. The temperature signal and the control circuit comple- ment each other to avoid errors caused by changes in resistance in the sliding contacts. In one embodiment, the temperature signal is a controlled current, indepen- dent of resistance in series with it, and the control circuit measures the current. In another embodiment, the temperature signal is a voltage and the control circuit measures the voltage using a circuit whose input impedance is so high that the resistances of the sliding contacts and their consequent voltage drops are negligible by com- parison. In a third embodiment, the temperature signal is a frequency and the control circuit measures the fre- quency to determine the temperature.
412021
Barrigar & Oyen
Oce-Nederland B.v.
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