Electric heating – Heating devices – Combined with diverse-type art device
Patent
1982-09-22
1984-09-11
Envall, Jr., Roy N.
Electric heating
Heating devices
Combined with diverse-type art device
355 3FU, 219471, 219469, G03G 1520, B21B 2700
Patent
active
044712103
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 characteristic is employed to control a temperature signal. The temperature signal from the drum is connected to stationary portions of the copying machine through sliding contacts. A control circuit responds to the temperature signal to control the energization of a heater to maintain the temperature of the drum at a predetermined value. The temperature signal and the control circuit complement each other to avoid errors caused by changes in resistance in the sliding contacts. In one embodiment, the temperature signal is a controlled current, independent 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 comparison. In a third embodiment, the temperature signal is a frequency and the control circuit measures the frequency to determine the temperature.
REFERENCES:
patent: 2526906 (1950-10-01), Schaab
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patent: 3500019 (1970-03-01), Childress
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patent: 3674963 (1972-07-01), Serrano
patent: 3758738 (1973-09-01), Otani
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patent: 4114023 (1978-09-01), Zelinka
patent: 4127764 (1978-11-01), Minden
patent: 4180721 (1979-12-01), Watanabe et al.
Envall Jr. Roy N.
Johnston Albert C.
O/c/ e-Nederland B.V.
Walberg Teresa J.
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