Rotary type electrostatic spray painting device

A rotary type electrostatic spray painting device comprising:

• a metallic housing;
• a metallic rotary shaft rotatably arranged in said housing and having a front end and a rear end;
• a cup shaped metallic spray head fixed onto the front end of said rotaty shaft and having a cup shaped inner wall and an approximately cylindrical inner wall which is spaced radially inwardly from said cup shaped inner wall and defines an annular space therein, said approximately cylindrical inner wall being arranged coaxially with a rotation axis of said rotary shaft and having a plurality of paint outflow bores, each being formed in said approximately cylindrical inner wall and smoothly connected to said cup shaped inner wall;
• feed means having a paint injection nozzle which is arranged in said annular space and is directed to said approximately cylindrical inner wall for feeing a paint onto said approximately cylindrical inner wall said paint injection nozzle being inclined in the direction of rotation of said spray head by a predetermined angle with respect to a radial line of said spray head which crosses said paint injection nozzle;
• drive means cooperating with said rotary shaft for rotating said rotary shaft;
• non-contact type radial bearing means arranged in said housing and cooperating with said rotary shaft for radially supporting said rotary shaft under a non-contacting state;
• non-contact type thrust bearing means arranged in said housing and cooperating with said rotary shaft for axially supporting said rotaty shaft under a non-contacting state;
• terminal means for receiving a negative high voltage, said terminal means being connected to said metallic housing, and;
• electrode means arranged in said metallic housing for electrically connecting said terminal means to said spray head.