Control apparatus for a pneumatically-operated hopper feeder

Details Control apparatus for a pneumatically-operated hopper feeder Control apparatus for a pneumatically-operated hopper feeder

1977-12-05

1979-10-30

Rolla, Joseph J.

Dispensing

Automatic control

By the weight of the material in the supply container

222 77, 406 23, 177114, 200 819R, 200 6121, 141268, 141 59, B67D 534, B65G 5304, H01H 3524, G01G 1326

Patent

active

041725352

ABSTRACT:
The operation of a vacuum-conveying hopper feeder is controlled using pneumatic logic circuitry including a leak sensor relay providing improved control accuracy and with a sensor orifice which becomes occluded by a spring-loaded plunger when the feeder body is filled to a predetermined weight. The leak sensor relay connects through a pneumatic logic NOT element to an aspirator or pump control valve and releases the vacuum allowing the contents of the body to be dumped. Time delay elements can be included between the relay, NOT element, and control valve so as to continue the filling for a predetermined interval following occlusion of the sensor orifice and to continue the dumping for a period following unblocking of the orifice.

REFERENCES:
patent: 3186768 (1965-06-01), Pendelton
patent: 3498395 (1970-03-01), Henry
patent: 3814877 (1974-06-01), Alvarez
patent: 4118612 (1978-10-01), Gabus

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