Patent ID: 8720796
Filing Date: 2014-05-13
Classification: B05B,F16D

Abstract:
1. A rotary atomizing head type coating device comprising: a rotational shaft adapted to be put in rotation by a motor and provided with a mounting shaft section at a fore distal end thereof, and a rotary atomizing head whose front portion is formed in a bell- or cup-shape and whose rear portion is a mounting tube section mounted on an outer peripheral side of said mounting shaft section of said rotational shaft, wherein: a rotation restricting mechanism which is adapted to restrict rotational movements of said rotary atomizing head in the rotational direction relative to said rotational shaft is provided between said mounting shaft section of said rotational shaft and said mounting tube section of said rotary atomizing head; and said rotation restricting mechanism is constituted by a male spline comprised of a plural number of spline teeth provided on the outer peripheral side of said mounting shaft section of said rotational shaft and extending in the axial direction in parallel relation with a longitudinal axis O-O of said rotational shaft, and a female spline comprised of a plural number of spline teeth provided on the inner peripheral side of said mounting tube section of said rotary atomizing head and extending in the axial direction in parallel relation with a longitudinal axis O-O of said rotational shaft for meshing engagement with said spline teeth, an axial displacement restricting mechanism, which is adapted to restrict displacements of said rotary atomizing head in the axial direction relative to said rotational shaft, is provided between said mounting shaft section of said rotational shaft and said mounting tube section of said rotary atomizing head, said axial displacement restricting mechanism is constituted by radially and outwardly displaceable coupling members provided on the outer peripheral side of said mounting shaft section of said rotational shaft, and a circumferentially extending fitting groove provided on the inner peripheral side of said mounting tube section of said rotary atomizing head in such a way as to permit intrusion and fitting of said coupling members, an axial aligning mechanism, which is adapted to push an inner peripheral surface of said rotary atomizing head against an outer peripheral surface of said rotational shaft to bring a center axis of said rotary atomizing head into alignment with a center axis of said rotational shall when said rotary atomizing head is put in rotation, is provided between said mounting shaft section of said rotational shaft and said mounting tube section of said rotary atomizing head, and said axial aligning mechanism is constituted by an inclined bottom surface provided at the bottom portion of said fitting groove in such a way that the groove depth gets shallower gradually from a deepest portion toward an opening side of said mounting tube section.