Rotary spray head coater

A rotary atomizing head coating machine, including an air motor, a rotational shaft provided axially in and rotated by said air motor, and a feed tube provided axially in said rotational shaft and having a fore end portion for spouting paint or solvent, said rotary atomizing head coating machine comprising:

• a rotary atomizing head mounted on said rotational shaft for high speed rotation and including a bell cup of bell- or cup-like shape, a hub member mounted on the inner peripheral side of said bell cup and defining a paint reservoir on and together with said bell cup for temporarily storing paint spouted through said feed tube, a plurality of paint outlet holes provided in said hub member to let paint or solvent supplied to said paint reservoir through said feed tube flow out from said paint reservoir onto fore inner peripheral surface of said bell cup, and a plurality of solvent passages provided in said bell cup to let a solvent supplied to said paint reservoir through said feed tube flow out from said paint reservoir onto outer peripheral surface of said bell cup;
• a plurality of assist air outlet holes provided in front end portions of said cover to spurt assist air for guiding said solvent toward the front end of said bell cup upon coming out onto outer peripheral side of said bell cup through said plurality of solvent passages;
• and
• a cover of cylindrical shape internally provided with an assist air passage to deliver assist air supplied from a pressurized air source, and an exhaust air passage to deliver exhaust air from said air motor, air from said assist air passage and exhaust air passage being joined together and spurted out through said plurality of assist air outlet holes.

A rotary atomizing head coating machine, including a cover of cylindrical shape, an air motor provided within said cover, a rotational shaft provided axially in and rotated by said air motor, and a feed tube provided axially in said rotational shaft and having a fore end portion for spouting paint or solvent, said rotary atomizing head coating machine comprising:

• a rotary atomizing head mounted on said rotational shaft for high speed rotation and including a bell cup of bell- or cup-like shape, a hub member mounted on the inner peripheral side of said bell cup and defining a paint reservoir on and together with said bell cup for temporarily storing paint spouted through said feed tube, a plurality of paint outlet holes provided in said hub member to let paint or solvent supplied to said paint reservoir through said feed tube flow out from said paint reservoir onto fore inner peripheral surface of said bell cup, and a plurality of solvent passages provided in said bell cup to let a solvent supplied to said paint reservoir through said feed tube flow out from said paint reservoir onto outer peripheral surface of said bell cup;
• a plurality of assist air outlet holes provided in front end portions of said cover to spurt assist air for guiding said solvent toward the front end of said bell cup upon coming out onto outer peripheral side of said bell cup through said plurality of solvent passages;
• and
• a flange portion formed around the fore end of said feed tube for diffusing distribution of solvent spouted through said feed tube,
• wherein said flange portion is provided with a plurality of notches at intervals around the circumference thereof.

A rotary atomizing head coating machine, including a cover of cylindrical shape, an air motor provided within said cover, a rotational shaft provided axially in and rotated by said air motor, and a feed tube provided axially in said rotational shaft and having a fore end portion for spouting paint or solvent, said rotary atomizing head coating machine comprising:

• a rotary atomizing head mounted on said rotational shaft for high speed rotation and including a bell cup of bell- or cup-like shape, a hub member mounted on the inner peripheral side of said bell cup and defining a paint reservoir on and together with said bell cup for temporarily storing paint spouted through said feed tube, a plurality of paint outlet holes provided in said hub member to let paint or solvent supplied to said paint reservoir through said feed tube flow out from said paint reservoir onto fore inner peripheral surface of said bell cup, and a plurality of solvent passages provided in said bell cup to let a solvent supplied to said paint reservoir through said feed tube flow out from said paint reservoir onto outer peripheral surface of said bell cup;
• a plurality of assist air outlet holes provided in front end portions of said cover to spurt assist air for guiding said solvent toward the front end of said bell cup upon coming out onto outer peripheral side of said bell cup through said plurality of solvent passages;
• and
• an annular guide member provided around the outer peripheral surface of said bell cup in predetermined spaced relation with the bell cup to form therebetween a solvent diffusing chamber for diffused distribution of said solvent coming out of said plurality of solvent passages.