Washing machine

Details Washing machine Washing machine

1992-03-30

1994-05-31

Coe, Philip R.

Textiles: fluid treating apparatus

Machines

Single tub and automatic sequential operation mechanism

68 1227, 324439, D06F 3302

Patent

active

053158474

ABSTRACT:
A washing machine comprises a washing/dehydrating tank, a water storage tank in which the washing/dehydrating tank is disposed, and a sensor for detecting an electric conductivity of washing water in the washing/dehydrating tank and the water storage tank. The sensor is provided with a pair of electrodes to take into account a variation of an electric resistance of the washing water therebetween, which is representative of the electric conductivity of the washing water, thereby controlling a washing operation of the washing machine. The sensor has a CR oscillation circuit including a resistance which represents the electric conductivity of the water between the electrodes. A variation of the electric conductivity of the washing water is converted into an oscillation frequency variation of the oscillation circuit, and the operation of the washing machine is controlled on the basis of the thus varying oscillation frequency.

REFERENCES:
patent: 3645669 (1972-02-01), Rausch
patent: 4091833 (1978-05-01), Ellis et al.
patent: 4237565 (1980-12-01), Torita et al.
patent: 4257708 (1981-03-01), Fukuda

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