Low voltage sensor for dryer

Details Low voltage sensor for dryer Low voltage sensor for dryer

1981-06-03

1983-05-31

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With apparatus using centrifugal force

34 55, 34 48, F26B 2106

Patent

active

043854524

ABSTRACT:
A fabric treating apparatus, such as a domestic clothes dryer, is provided with a microcomputer controlled circuit and a sensor system which cooperates to terminate a fabric treatment operation when the fabric reaches the desired condition. A conductivity sensor senses the moisture content of the fabric within the drying zone. A sensing circuit electrically connected to the sensor generates a voltage level proportional to the moisture condition sensed. The microcomputer reads the voltage level at spaced intervals in time and generates a valid wet signal whenever a given consecutive number of readings indicate a wet condition of the fabric within the drying zone. A counter within the microcomputer counts pulses from a source of timing signals and is repeatedly terminated and restarted whenever a valid wet signal is generated. The fabric drying operation is terminated upon the accumulation of a preselected count in the counter such that the termination coincides with an optimum dryness condition.

REFERENCES:
patent: 3460267 (1969-08-01), Lorenz
patent: 3621293 (1971-11-01), Heldtmann
patent: 3702030 (1972-11-01), Janke
patent: 3762064 (1973-10-01), Offutt
patent: 3769716 (1973-11-01), Janke
patent: 4197866 (1980-04-01), Neal
patent: 4215486 (1980-08-01), Heyer et al.

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