Dispensing – Automatic control – Material level control
Patent
1982-07-14
1985-10-08
Tollberg, Stanley H.
Dispensing
Automatic control
Material level control
2221466, B67D 562
Patent
active
045455058
ABSTRACT:
An electronic control circuit for carbonated beverage dispensing machines employs the low voltage AC supply for the solenoid dispensing valves as a source of clipped, balanced ac which is applied to one or more water-imersed sensors. One sensor senses ice mass size and the other senses carbonated water supply level. The balanced ac prevents electroplating by the sensors. Peak detector circuits associated with the sensors produce dc control signals whose levels increase and decrease respectively as the control shut-off point is reached. These dc control signals are applied to Schmitt circuits, the output of one of which is used to control the carbonated water supply pump and the other of which inversely controls the refrigerant compressor. In addition, the balanced ac signal is used to clock a counter which is held at full count. Reset for this counter is effected in response to solenoid valve energization and the counter output is OR'ed with the refrigerant compressor signal to control the coolant water agitator motor.
REFERENCES:
patent: 3196625 (1965-07-01), Nicolaus
patent: 3892335 (1975-07-01), Schroeder
patent: 4008832 (1977-02-01), Rodth
patent: 4263587 (1981-04-01), John
Chow Edmund E.
Mueller Richard J.
Reed Industries, Inc.
Tollberg Stanley H.
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