Importance

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Abstract

A spray coating apparatus (10) for applying a paint composed of a controlled mixture of two liquid components. A first gear pump (32) is disposed in a spray booth (30) and pumps the first component to an applicator (14). A second gear pump (36) in the spray booth (30) pumps the second component to the applicator (14). A manifold (44) is disposed between the two gear pumps (32, 36) and the applicator (14) for converging the two paint components. A variable speed motor (16, 20) controls the rate of fluid pumped by each of the gear pumps (32, 36). Each motor (16, 20) includes an encoder (27, 29) sending feedback signals to an adjustor module (24) which computes an instantaneous ratio between the volumetric flow rates of the first and second components and compares this instantaneous ratio with a reference ratio, then adjusts the instantaneous speed of each motor (16, 20) thereby adjusting the ratio between the volumetric flow rates of the first and second components with respect to the reference ratio.

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First Claim