F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
341/11
F26B 25/22 (2006.01) D06F 58/28 (2006.01) F26B 21/06 (2006.01)
Patent
CA 1172337
PA-5112-0-DR-USA LOW VOLTAGE SENSOR FOR A DRYER ABSTRACT OF THE DISCLOSURE 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 con- dition. 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 dis- charge. As the fabric dries the capacitor will discharge more slowly. After the capacitor has been allowed to dis- charge 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 accum- ulated in the counter which triggers cicruitry to terminate the fabric drying operation.
393379
Corporation Whirlpool
Kirby Eades Gale Baker
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