Patent ID: 8978580
Filing Date: 2015-03-17
Classification: B05B

Abstract:
1. An electrostatic coating apparatus comprising: a motor, a rotary atomizing head provided rotatably on a fore end side of said motor, a shaping air ring disposed on a rear side of said rotary atomizing head, a plurality of air outlet holes provided in said shaping air ring and arranged in an annular shape along a paint releasing edge of said rotary atomizing head to spurt out shaping air, a cover member provided in a tubular shape in such a manner as to enshroud outer surfaces of said motor, an external electrode assembly provided on an outer periphery of said cover member, and a high voltage application means for applying a high voltage to said external electrode assembly to indirectly electrify sprayed paint particles from said rotary atomizing head with a high voltage electrostatic charge, wherein: said rotary atomizing head is formed of a material which is electrically conductive in its entirety or whose surface at least is electrically conductive or semi-conductive and said rotary atomizing head is connected to the earth; said shaping air ring comprises an annular portion radially outward relative to said air outlet holes, said annular portion being formed of an electrically conducting material, connected to the earth; said cover member is formed of an electrically insulating material, and is arranged to enshroud an outer peripheral side of said shaping air ring over its entire surface; an electric field concentrating portion for causing an electric field to be concentrated around said air outlet holes is provided on said shaping air ring; said electric field concentrating portion is formed of an electrically conducting material connected to the earth and by an annular projecting portion which is formed in an annular shape along said plurality of air outlet holes formed in a front side portion of said shaping air ring, and projects from the front side portion of said shaping air ring toward said rotary atomizing head; said annular projecting portion has a fore distal end surface located at a projecting end thereof, an outer peripheral surface which is located on an outer peripheral side of said fore distal end surface, a substantially annular outer peripheral edge portion which is formed between said fore distal end surface and said outer peripheral surface, and an inner peripheral surface located on an inner peripheral side of said fore distal end surface; and said plurality of air outlet holes are arranged to be open at said fore distal end surface of said annular projecting portion.