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US 4,368,853 AGranted
Rotary type electrostatic spray painting device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTeru Morishita, Matuyosi Sugiyama, Toshikazu Suzuki
Life of this patent
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Abstract
A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.
Claims20
A rotary type electrostatic spray painting device comprising:
- a metallic housing;
- a metallic rotary shaft rotatably arranged in said metallic housing and having a front end and a rear end, said rotary shaft further having a hollow shaft portion having a predetermined hollow portion diameter, said hollow shaft portion being axially contiguous with first and second solid shaft portions at said front and rear ends, respectively, said first and second solid shaft portions having respective solid portion diameters, said hollow portion diameter being larger than said solid portion diameters;
- a cup shaped metallic spray head fixed onto said first solid shaft portion at said 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 rotary shaft for rotating said rotary shaft;
- non-contact type radial bearing means arranged in said metallic housing and arranged with respect to said metallic rotary shaft so as to be adjacent to said hollow shaft portion of said rotary shaft for radially supporting said rotary shaft under a non-contacting state;
- non-contact type thrust bearing means arranged in said metallic housing and arranged with respect to said metallic rotary shaft so as to be adjacent to said second solid shaft portion for axially supporting said metallic rotary shaft under a non-contacting state;
- terminal means for receiving a negative high voltage, said terminal means being connected to said housing;
- and
- electrode means arranged in said housing and electrically connecting said terminal means to said spray head.
7 more elements
A rotary type electrostatic paint spraying device comprising:
- a metallic housing;
- a metallic rotary shaft rotatably arranged in said metallic housing, said rotary shaft having a front end and a rear end said rotary shaft further having a hollow shaft portion having a predetermined hollow portion diameter, said hollow shaft portion being contiguous with first and second solid shaft portions having respective solid shaft portion diameters, said hollow portion diameter being larger than said solid portion diameters;
- a cup shaped metallic spray head fixed onto said first solid shaft portion at said 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;
- air connector means for receiving compressed air and introducing said compressed air into said metallic housing, said compressed air flowing within said metallic housing along at least a first predetermined air path;
- drive means arranged adjacent to said second solid portion of said rotary shaft for rotating said rotary shaft in response to said compressed air from said air connector means flowing along said first predetermined air path;
- non-contact type radial bearing means arranged in said metallic housing and arranged with respect to said rotary shaft so as to be adjacent to said hollow shaft portion for axially supporting said rotary shaft under a non-contacting state;
- non-contact type thrust bearing means arranged in said metallic housing and arranged with respect to said rotary shaft so as to be adjacent to said second solid shaft portion for axially supporting said rotary shaft under a non-contacting state;
- terminal means for receiving a negative high voltage, said terminal means being connected to said housing;
- and
- electrode means arranged in said metallic housing for electrically connecting said terminal means to said rotary shaft, at least a portion of said electrode means being arranged in said first predetermined air path for cooling said electrode means.
8 more elements
Dependencies are inferred from the claim text.