Patent ID: 7371284

Claim:
A powder coating apparatus comprising: a rotating and holding mechanism for rotatably holding a cylindrical object having an outer circumferential periphery serving as a coating area, non-coating areas axially extending from axial end faces of the cylindrical object, respectively, and an inner space formed inside the outer circumferential periphery; a powder spray nozzle for spraying a resin powder onto the outer circumferential periphery of the cylindrical object; first and second masking members disposed on both axial ends of the cylindrical object for rotatably supporting the cylindrical object to mask the non-coating areas of the cylindrical object so as to define axial clearances between the first and second masking members and the axial end faces of the cylindrical object, respectively, and first and second radial clearances formed on both ends of the cylindrical object between the first and second masking members and the both ends of the cylindrical object, respectively; and a compressed air supply unit connected through one of the first and second masking members to the inner space of the cylindrical object for supplying a flow of compressed air thereto to discharge the flow of compressed air from the inner space of the cylindrical object to an outside of the cylindrical object through the first and second axial clearances and the first and second radial clearances in opposition to a flow of the resin powder being sprayed onto the outer circumferential periphery of the cylindrical object.