Coating apparatus – Control means responsive to a randomly occurring sensed... – Responsive to attribute – absence or presence of work
Patent
1979-03-23
1981-02-10
Silverberg, Sam
Coating apparatus
Control means responsive to a randomly occurring sensed...
Responsive to attribute, absence or presence of work
118DIG4, 118683, 118324, B05C 500
Patent
active
042494788
ABSTRACT:
A controller for maintaining a constant thickness of a layer applied to work pieces fed through a liquified curtain, the curtain itself being provided through a positive displacement pump which is driven by a motor having means for varying its speed from a remote locate. The work pieces are fed by an infeed conveyor, which is also driven by a motor of the variable speed type, and magnetic pickups or sensors are provided to produce two discrete trains of pulses indicative of the speed of the infeed conveyor, and of the positive displacement pump respectively. A digital readout ratio calculating unit is provided to produce a display indicative of the ratio of these pulse train frequencies, and the unit can be preset to provide an input to low and high limit preset counters. The preset low and the high preset counts are electrically connected to relays, which control the speed of the pump motor itself through conventional circuitry, and the resulting controller provides for continuously updating the speed of the pump motor to maintain a predetermined ratio of its speed to that of the infeed conveyor for maintaining a predetermined coating thickness on the work piece.
REFERENCES:
patent: 4060649 (1977-11-01), Coleman
patent: 4075976 (1978-02-01), Clayton
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