Electricity: motive power systems – Automatic and/or with time-delay means – Radiant energy
Patent
1976-07-12
1978-06-20
Dobeck, B.
Electricity: motive power systems
Automatic and/or with time-delay means
Radiant energy
318 39, 250223R, G01D 534
Patent
active
040964248
ABSTRACT:
Disclosed is a circuit for automatically controlling the feed rate of parts that is particularly adapted for controlling inductive loads. Disposed on either side of a passageway is a light source and a photo-sensing device which emits a signal pulse whenever a part interrupts the light beam between the light source and the photo-sensor. The pulses from the photo-sensing device are supplied to a monostable multivibrator which converts the pulses to uniform width, fixed amplitude pulses that are integrated and provided to a control circuit which controls the charge on a capacitor. When the charge on the capacitor exceeds a predetermined level an SCR is triggered, operating the motive means of the circuit.
In addition to a first discharge path for controlling the charge on the capacitor in accordance with the frequency of the signal pulses from the photo-sensing device, the control circuit provides an additional discharge path for resetting the charge level on the capacitor to its quiescent state after each cycle of the power supply signal. In this manner, the motor can be operated at low speed control settings without causing erratic operation due to "skip-cycling".
Also disclosed is circuitry which permits the system to be used to control inductive motors such as vibratory feeders without causing overheating of the motors after a continuous period of use.
REFERENCES:
patent: 2966253 (1960-12-01), Gerrans
patent: 3200932 (1965-08-01), Metz et al.
patent: 3546555 (1970-12-01), Morgan et al.
patent: 3780297 (1973-12-01), Geary
patent: 3845375 (1974-10-01), Stiebel
patent: 3919612 (1975-11-01), Ratzel et al.
patent: 3921047 (1975-11-01), Carter
Dobeck B.
N.D.T. Laboratories, Inc.
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