Vibratory feeder voltage control

Conveyors: power-driven – Conveyor section – Reciprocating conveying surface

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198524, B65G 4300

Patent

active

051450542

ABSTRACT:
A control for regulating the AC voltage provide to a vibratory feeder, which includes electronic circuitry for generating a "desired" voltage signal, feedback circuitry for generating an "actual" voltage signal, a logic circuit for comparing the "desired" and "actual" voltage signals and generating a difference signal, and a controller which uses the difference signal to generate a control signal for regulating the AC voltage provided to the feeder. An initialization circuit enables the control a predetermined time after AC power is applied and an automatic relay couples a DC power source to the control for selective adjustment of the control output. A fault circuit automatically shuts down the control if the feedback signal is lost when the "desired" voltage signal is at or turned down to a predetermined level. A maximum AC output indicator identifies the optimum setting for a maximum output adjustment, regardless of load, and a ramp function determines the build-up and decay of the AC output voltage. Logic circuits are utilized in conjunction with the control for independently setting "on" and "off" delay periods and for controlling the on/off operation of the control in response to high and low sensor signals relating to backlogs of parts.

REFERENCES:
patent: 3922589 (1975-11-01), Peckingham
patent: 4101816 (1978-07-01), Shepter
patent: 4216416 (1980-08-01), Grace
patent: 4300083 (1981-11-01), Heiges
patent: 4331263 (1982-05-01), Brown
patent: 4369398 (1983-01-01), Lowry
patent: 4456822 (1984-06-01), Rose et al.

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