Powder paint supply device

A paint supply device for use with an electrostatic powder painting apparatus that includes a paint tank for containing paint powder and a painting gun operatively coupled to said paint tank through an injector and a hose, said paint supply device comprising:

• discharge means for discharging paint powder from a paint tank when the supply device is connected to the tank of an electrostatic painting apparatus, a hopper so associated with said discharge means as to receive paint powder discharged by said discharge means, a screw feeder disposed at the bottom of said hopper, said screw feeder including a casing defining a discharge port at a discharge side thereof, and a screw rotatably supported and extending in said casing to a tip, the tip of said screw protruding to said discharge port, a flow straightener provided adjacent said discharge port and having a drop port in the bottom thereof, a lid plate slidably supported so as to be movable in the axial direction of said screw to and from a position closing said discharge port, and biasing means for urging said lid plate to said position closing the discharge port.