Low voltage sensor for a dryer

Details Low voltage sensor for a dryer Low voltage sensor for a dryer

1981-06-29

1983-12-27

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 53, 34 55, 34133, F26B 2110

Patent

active

044222475

ABSTRACT:
A fabric treating apparatus, such as a domestic clothes dryer, is provided with a digital control circuit and a sensor system which cooperate to terminate a fabric treatment operation when the fabric reaches a desired condition. A digital counter receives and accumulates timing pulses. A sensing circuit repetitively charges a capacitor which is allowed to discharge through a sensor in contact with the wet fabric load. If the fabric in contact with the sensor is wet, the capacitor will quickly discharge. As the fabric dries the capacitor will discharge more slowly. After the capacitor has been allowed to discharge for a preselected period, the charge on the capacitor is read and if low, the counter is reset. As the fabric load approaches the desired dryness condition, the remaining charge on the capacitor will increase until it reaches a level which prevents the counter from being reset. Thus, the counter accumulates successively greater counts before being reset, until eventually a preselected count is accumulated in the counter which triggers cicruitry to terminate the fabric drying operation.

REFERENCES:
patent: 3324568 (1967-06-01), Nelson et al.
patent: 3497964 (1970-03-01), Elders
patent: 3758959 (1973-09-01), Karklys
patent: 4385451 (1983-05-01), Wesley
patent: 4385452 (1983-05-01), De Schaaf

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