APPARATUS FOR ELECTROSTATICALLY COATING POWDERS ON A WORKPIECE

摘要

Apparatus for electrostatically coating powders on a workpiece from a rotating injection head having a plurality of nozzles disposed outwardly from the axis of the rotating injection head and rotatably mounted on the injection head for dispersing the powders. Each of the nozzles has a curved or bent portion, such that the distance between the nozzle and the axis of the rotating injection head and the angle from which the powders are dispersed are variable. The apparatus is utilized for performing a method of electrostatically coating powders on a workpiece comprising the steps of dispersing the powders in such a manner that the angle at which the powders are dispersed is variable. The apparatus also comprises a mixer connected to a source of compressed air for supplying the powders from a source through a pipe into the injection head with an air stream fed from a compressed air source, a controller for controlling the powder supply from the powder source to the injection head, and a constant powder supplying means for supplying the powders from the powder source to the mixer, whereby the powder supply is controlled by the powder supply means.