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US 4,378,091 AGranted
Rotary type electrostatic spray painting device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTeru Morishita, Matsuyoshi Sugiyama, Toshikazu Suzuki
Life of this patent
Estimating the term…
Abstract
A rotary type electrostatic spray painting device is provided with 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 in a no-contact state by a single thrust air bearing, a pair of radial air bearings, and a magnetic bearing arranged between the radial air bearings. An electrode for providing continuous electrical contact with the rear end of the rotary shaft, is cooled by being at least partially arranged in a flow path of compressed air. A negative high voltage is applied to the housing of the painting device, which is applied to the spray head via the electrode and the rotary shaft.
Claims24
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 metallic rotary shaft further having a hollow portion having a first diameter and arranged axially contiguous with and intermediate of first and second solid portions arranged at said front and rear ends, respectively, said first and second solid portions having respective diameters which are smaller than said first diameter;
- a cup-shaped metallic spray head fixed onto said first solid portion at said front end of said metallic 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 air bearing means arranged in said metallic housing and arranged with respect to said metallic rotary shaft so as to be adjacent to said hollow portion of said metallic rotary shaft for radially supporting said metallic rotary shaft in a non-contacting state;
- non-contact type radial magnetic bearing means arranged in said metallic housing and cooperating with said metallic rotary shaft for radially supporting said rotary shaft in 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 portion for axially supporting said metallic rotary shaft in 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 for electrically coupling said terminal means to said spray head.
8 more elements
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 metallic rotary shaft further having a hollow portion having a first diameter and arranged axially contiguous with and intermediate of first and second solid portions arranged at said front and rear ends, respectively, said first and second solid portions having respective diameters which are smaller than said first diameter;
- a cup-shaped metallic spray head fixed onto said first solid portion at said front end of said metallic 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 metallic rotary shaft;
- non-contact type radial air bearing means arranged in said metallic housing and arranged with respect to said metallic rotary shaft so as to be adjacent to said hollow portion of said metallic rotary shaft for radially supporting said metallic rotary shaft in a non-contacting state;
- non-contact type radial magnetic bearing means arranged in said metallic housing, said magnetic bearing means having an annular shape, and cooperating with said hollow portion of said metallic rotary shaft for radially supporting said metallic rotary shaft in 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 portion for axially supporting said metallic rotary shaft in 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 coupling said terminal means to said spray head.
8 more elements
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 metallic rotary shaft further having a hollow portion having a first diameter and arranged axially contiguous with and intermediate of first and second solid portions arranged at said front and rear ends, respectively, said first and second solid portions having respective diameters which are smaller than said first diameter;
- a cup-shaped metallic spray head fixed onto said first solid portion at said front end of said metallic 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 metallic rotary shaft;
- air supply coupling means for receiving air under pressure 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;
- non-contact type radial air bearings means arranged in said metallic housing and arranged with respect to said metallic rotary shaft so as to be adjacent to said hollow portion of said metallic rotary shaft for radially supporting said metallic rotary shaft in a non-contacting state;
- non-contact type radial magnetic bearing means arranged in said metallic housing and cooperating with said metallic rotary shaft for radially supporting said metallic rotary shaft in 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 portion for axially supporting said metallic rotary shaft in 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 coupling said terminal means to said spray head, at least a portion of said electrode means being arranged in said first predetermined air path for cooling said electrode means.
9 more elements
Dependencies are inferred from the claim text.