Rotary atomizing head type coating device

Abstract

A rotation restricting mechanism is provided between a mounting shaft section of a rotational shaft and a mounting tube section of a rotary atomizing head. The rotation restricting mechanism is constituted by a male spline member which is provided on the outer peripheral side of the mounting shaft section, and a female spline member which is provided on the inner peripheral side of the mounting tube section. By meshing engagement of the male spline member with the female spline member, the rotation restricting mechanism restricts rotational displacements of the rotary atomizing head relative to the rotational shaft ( 14 ).

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; 
 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; and 
 said rotation restricting mechanism and said axial displacement restricting mechanism are constituted by one or a plural number of radially and outwardly displaceable coupling members provided on the outer peripheral side of said mounting shaft section of said rotational shaft, and fitting portions which are comprised of a plural number of independent grooves formed in series around the inner peripheral side of said mounting tube section of said rotary atomizing head and permit fitting of said coupling members in a fixed state relative to both axial and rotational directions when said coupling members intrude into said fitting portions. 
   
     
     
         2 . A rotary atomizing head type coating device according to  claim 1 , wherein 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 shaft 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. 
     
     
         3 . A rotary atomizing head type coating device according to  claim 2 , wherein said axial aligning mechanism is constituted by inclined bottom surfaces provided at the bottom portion of said independent grooves of said fitting portions in such a way that the groove depths get shallower gradually from a deepest portion toward an opening side of said mounting tube section. 
     
     
         4 . 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; 
 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; and 
 said rotation restricting mechanism and axial displacement restricting mechanism are constituted by arm members provided on the outer peripheral side of said mounting shaft section of said rotational shaft and provided with free ends at fore distal ends thereof to be flexible in the radial direction, claw members provided on fore distal ends of said arm members and projected toward the radially outward direction, and fitting portions which are comprised of a plural number of independent grooves formed in series around the inner peripheral side of said mounting tube section of said rotary atomizing head and permit fitting of said claw members in a fixed state relative to both axial and rotational directions when said claw members intrude into said fitting portions. 
   
     
     
         5 . A rotary atomizing head type coating device according to  claim 4 , wherein 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 shaft 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. 
     
     
         6 . A rotary atomizing head type coating device according to  claim 5 , wherein said axial aligning mechanism is constituted by inclined surfaces provided internally of said independent grooves of said fitting portions in such a way that the groove depths get shallower gradually from a deepest portion toward an opening side of said mounting tube section.