Coating system with correction for non-linear dispensing charact

Coating apparatus – Control means responsive to a randomly occurring sensed... – Responsive to attribute – absence or presence of work

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118674, 118308, 118324, 118DIG5, B05C 1906

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active

050564625

ABSTRACT:
A coating system is provided with a controller which transforms a demand signal responsive to the speed, relative to the dispensing apparatus, of an object to be coated, into a control signal which adjusts for the non-linear output characteristics of the flow of coating powder through the dispensing apparatus to cause the material to be dispensed with a uniformity that is corrected for the non-linear relationship between those output characteristics and the speed of the object. In the preferred embodiment, the system corrects for the non-linear characteristics of different powder pumps in dispensing different powder coating materials upon objects carried by variable speed conveyors. A plurality of stair-step tables are stored in the memory of the controller. Each table represents a different selectable powder pump to provide a desired powder pump output characteristic. A digital pulse counter signals the conveyor speed by periodically sending a speed count signal to the controller memory which is periodically gated with a selected stored table to set the level of the control signal which determines the powder flow of the pumping apparatus.

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