A powder spraying gun generates a desired pattern of electrostatically
charged particles for coating a workpiece without rotating parts or
particle deflectors. The powder pattern is generated with a funnel-shaped
output in conjunction with air introduced into a powder charging chamber
of the gun in a tangential swirling motion. The swirling air is
additionally used to purge agglomerated powder particles from the charging
electrodes in the charging chamber. The charging chamber surface is
fashioned from material exhibiting low friction or high resistance to
powder impact fusion.
