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, said metallic rotary shaft having a hollow shaft portion having a first diameter and a solid shaft portion having a second diameter which is substantially smaller than said first diameter;
• a cup-shaped metallic spray head fixed onto the front end of said rotary shaft and having a cup-shaped inner wall;
• feeding means for feeding a paint onto said cup-shaped inner wall;
• drive means cooperating with said metallic rotary shaft for rotating said rotary shaft;
• non-contact type radial bearing means arranged in said housing and cooperating with said hollow shaft portion for radially supporting said metallic rotary shaft in a non-contacting state;
• means for receiving compressed air;
• a stationary annular plate fixed onto said housing and having opposed side walls, said annular plate having a plurality of first air outflow bores formed on said opposed side walls;
• a plurality of radially extending air passages, each being formed in said annular plate and having an outer end, and an inner end which is connected to said corresponding first air outflow bore, each of said outer ends being connected to said means for receiving compressed air;
• a pair of runners fixed onto said solid shaft portion of said metallic rotary shaft and arranged on each side of said annular plate, each of said runners being slightly spaced from the corresponding side wall of said annular plate;
• terminal means for receiving a negative high voltage and being connected to said metallic housing;
• and
• electrode means arranged in said housing and electrically connecting said terminal means to said spray head.