Rotating spraying type coating apparatus

A rotating spraying type coating apparatus, comprising:

• a rotating drive device having a rotary shaft,
• a substantially cylindrical spraying head attached to the rotary shaft of said rotating drive device, said spraying head having a base end of the side of said rotary shaft and top end on the side of an article to be coated,
• a paint supplying passage connected to said spraying head,
• paint radiating means for radiating paint particles and mounted at the top end of said spraying head, and
• air jetting means comprising at least one pair of air jetting openings having a sufficiently small length between inner walls thereof, relative to the circumference length of the spraying head and provided on both sides of said spraying head, prolongations of central axes of said at least one pair of air jetting openings intersecting said outer circumferential wall of said spraying head at a predetermined angle, for jetting air locally on the outer circumferential wall of said spraying head and for spreading said locally jetted air in the circumferential direction along the whole outer circumferential wall to form air streams having a circumferential velocity component in addition to an axial velocity component, said axial velocity component being largest at the locally air-jetted portion on the outer circumferential wall and smaller at a portion farther therefrom and said circumferential velocity component being smallest at the locally air-jetted portion and the larger at a portion farther therefrom, so as to enable said air streams to wrap said paint particles as soon as said paint particles leave said spraying head and to form said paint particles into a coating pattern substantially of a dumbell or elongated shape composed of two portions joined together, each of said portions having a large axial velocity component and having a part with more paint particles than a remaining part therein.