Dispensing – Automatic control – Constant weight – volume or pressure control by output
Patent
1975-04-03
1981-07-21
Dobeck, B.
Dispensing
Automatic control
Constant weight, volume or pressure control by output
318318, 222 63, G05G 1112
Patent
active
RE0306843
ABSTRACT:
The throughput of a conveyor belt is controlled by a motor whose speed is established by the instantaneous state of an up/down counter. The counter is incremented upwardly by setpoint pulses representative of the desired mass flow rate, and downwardly by feedback pulses from a rate multiplier representative of the actual mass flow rate. When the actual mass flow rate is equal to the setpoint flow rate, the average number of setpoint pulses will equal the average number of feedback pulses with the result that the state of the counter will be stable with time. Speed control means for the motor maintains the belt speed at a level dependent upon the state of the counter. A variation between the actual and desired mass flow rates is manifested by a change in the average number of feedback pulses which results in a change in the state of the counter. The resultant change in the motor speed and hence the belt speed restores the average number of feedback pulses to equality with the setpoint pulses thus restoring stability to the counter and restoring the actual mass flow rate to the setpoint rate.
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Dobeck B.
K-Tron International Inc.
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