Abstract:
A common coil device in a dryer control circuit usable as an electromagnetic device for developing functions of both a motor and a relay. The relay function is utilized as a circuit continuity function which is normally provided as a shunt to a momentarily operated starting push button, and the motor function is utilized as a timer for intermittent pulsing of the dryer drive motor during an antiwrinkle cycle.
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 has reached a desired condition. A digital counter receives and accumulates pulses from a reference source and is repetitively reset by signals from a sensor circuit which provides reset pulses at a rate dependent upon the dryness condition of the fabric load. As the fabric load approaches the desired dryness condition the interval between reset pulses increases, thus allowing the counter to accumulate successively greater counts before being reset, until eventually a preselected count is accumulated which triggers circuitry to terminate the fabric drying operation. After termination of the drying operation the counter serves as a clock and operates in conjunction with an indexable digital memory and associated logic circuitry to control a program of subsequent fabric treatment operations.
Abstract:
A semielectronic control system for a combination washing and drying machine utilizing a solenoid-actuated stepping switch, each successive position of the switch controlling such functions as water fill, agitate, drain, extract, and dry making up the washer-dryer''s cycle of operation. Energization of the solenoid is controlled either by RC timer circuitry having a number of selective delays or by circuitry responsive to sensed conditions. The stepping switch selects the appropriate delay in the RC timing circuitry or the proper condition responsive circuit which causes energization of the solenoid to advance the stepping switch to the next position.