Control system for the drop-out zone of a constant speed accumul

Details Control system for the drop-out zone of a constant speed accumul Control system for the drop-out zone of a constant speed accumul

1996-05-10

1998-10-20

Bidwell, James R.

Conveyors: power-driven

Conveyor section

Live roll

19878104, B65G 1306

Patent

active

058233199

ABSTRACT:
A control system for a conveyor system of the type having a first constant speed conveyor with a drop-out zone and a second variable speed downstream conveyor receiving products from the drop-out zone. The drop-out zone comprises a plurality of conveyor rollers driven by a drive mechanism operated by a constant speed prime mover assembly. An actuator engages and disengages the drive mechanism with the drop-out zone rollers. The control system has a processing circuit configured to ascertain the velocity of the downstream conveyor and configured to match the effective velocity of the first conveyor drop-out zone to that of the downstream conveyor by use of a periodic varying duty cycle signal that controls the actuator via an output device in communication with the processing circuit. The processing circuit also varies the ON-time and OFF-time of the varying duty cycle signal to automatically control energizing of the output device to accomplish the velocity match. The processing circuit is also capable of changing the period of the duty cycle signal when required.

REFERENCES:
patent: 3960262 (1976-06-01), Henig
patent: 4103769 (1978-08-01), Jorgensen
patent: 4383605 (1983-05-01), Harwick
patent: 4453627 (1984-06-01), Wilkins
patent: 4473149 (1984-09-01), Vogt et al.
patent: 4721203 (1988-01-01), Kimball et al.
patent: 5375696 (1994-12-01), Collins et al.
Uni-Com.RTM. Power Conveyor Brochure, The Buschman Company, Cincinnati, Ohio, issued Jul. 1993.

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