Control device for a laundry drier

Details Control device for a laundry drier Control device for a laundry drier

1982-07-19

1984-09-11

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 53, 34 55, F26B 1900

Patent

active

044702043

ABSTRACT:
A control device for a laundry drier of the kind in which mechanical movement of the laundry load in a drum causes the article(s) constituting the load to form an electrically resistive connection between contact electrodes 5 and 6 in the drum. An a.c. sensing current is fed from a transformer T1 via the load and through a series capacitor C2 such that the voltage across the capacitor C3 is an inverse function of the state of dryness of the articles. This voltage is compared in a comparator TR1 with a reference voltage Vref which is chosen so that the comparator TR1 produces an output signal when the articles of the load have reached a predetermined dryness. Any electrostatic charges developed in the load are suppressed by a unidirectional low impedance shunt comprising a diode D8 and a resistor R12 in series.

REFERENCES:
patent: 3491458 (1970-01-01), Elders et al.
patent: 4215486 (1980-08-01), Heyer et al.
patent: 4385451 (1983-05-01), Wesley

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