Arrangement for monitoring the operation of a heating element

Details Arrangement for monitoring the operation of a heating element Arrangement for monitoring the operation of a heating element

1980-10-14

1983-01-18

Reynolds, B. A.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219483, 219502, 219216, 219492, 219505, 219509, 307117, 307252B, 361106, H05B 102

Patent

active

043693547

ABSTRACT:
A heating arrangement in a fixing station of a printing device has its operation monitored by an arrangement in which a measuring element is disposed in series with the heating element and a switch element. The measuring element is traversed by the heating current and emits a corresponding voltage which is supplied to an amplifier circuit which produces pulse-shaped clock signals as long as the heating current flows through the measuring element and the heating element. The clock signals are supplied to a reset input of a flip-flop whose dynamic input is connected to an oscillator operating at a frequency lower than that of the alternating current so that as long as clock pulses occur, the flip-flop is constantly reset. Therefore, the flip-flop can only be set over a longer interval when no heating current is flowing. If heating current flows although no heating current should flow, the same is identified by a counter whose counting input is connected to the amplifier circuit and whose reset input is connected to a heat sensor. Therefore, an undesired heating current through the heating element causes operation of the counter. A set flip-flop or a counting counter indicate malfunctions of the heating arrangement.

REFERENCES:
patent: 4001650 (1977-01-01), Romain
patent: 4039928 (1977-08-01), Noftsker et al.
patent: 4104692 (1978-08-01), Sudo et al.
patent: 4109134 (1978-08-01), Van Herten
patent: 4233498 (1980-11-01), Payne et al.

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