EP0034254A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A rotary type electrostatic spray painting device
Assignee: Toyota Motor Corp
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Filing: 1981-01-16
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Granted: —
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Expires: 2001-01-16
Abstract
Abstract A rotaty 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 singlethrust magnetic 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.
Inventors
- 👤 Teru Morishita
- 👤 Matuyosi Sugiyama
- 👤 Akira Sato
- 👤 Toshikazu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
F; F16; F16C; F16C17/00; F16C17/02; F16C17/03; B; B05; B05B; B05B5/00; B05B5/025; B05B5/04; B05B5/0415; F16C32/00; F16C32/04; F16C32/0402; F16C32/0406; F16C32/0408; F16C32/0423; F16C32/0427; F16C2320/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
157 words
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 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 rotaty 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 magnetic bearing means arranged in said housing and cooperating with said rotary shaft for axially supporting said rotary shaft under a non-contacting state; a generator generating a negative high voltage and having an output connected to said housing, and; electrode means arranged in said housing and electrically connecting said output to said spray head.
Claim 2
Dependent Claim
157 words
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 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 rotaty 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 magnetic bearing means arranged in said housing and cooperating with said rotary shaft for axially supporting said rotary shaft under a non-contacting state; a generator generating a negative high voltage and having an output connected to said housing, and; electrode means arranged in said housing and electrically connecting said output to said spray head.
Claim 3
Dependent Claim
26 words
A rotary type electrostatic spray painting device as claimed in claim 1, wherein said non-contact type radial bearing means comprises a pair of radial air bearings.
Claim 4
Dependent Claim
84 words
A rotary type electrostatic spray painting device as claimed in claim 2, wherein each of said radial air bearings comprises a bearing frame connected to said housing, a plurality of pads, each having an inner face which extends along a circumferential outer wall of said rotary shaft and arranged to be spaced from the circumferential outer wall of said rotary shaft by a slight distance, and a plurality of support pins, each being connected to said bearing frame and pivotally supporting said corresponding pad.
Claim 5
Dependent Claim
51 words
A rotary type electrostatic spray painting device as claimed in claim 3, wherein each of said radial air bearings further comprises a resilient arm through which one of said support pins is connected to said bearing frame for biasing said corresponding pad to the circumferential outer wall of said rotary shaft.
Claim 6
Dependent Claim
47 words
A rotary type electrostatic spray painting device as claimed in claim 3, wherein each of said pads has an outer wall forming a spherical recess thereon, each of said support pins having a spherical tip which is in engagement with the spherical recess of said corresponding pad.
Claim 7
Dependent Claim
67 words
A rotary type electrostatic spray painting device as claimed in claim 1, wherein said non-contact type thrust magnetic bearing means comprises a stationary magnet means fixed onto said housing, and a rotary magnet means fixed onto said rotary shaft and arranged to be spaced from said stationary magnet means by a slight distance, said stationary and rotary magnet means being arranged to cause a repulsing force therebetween.
Claim 8
Dependent Claim
110 words
A rotary type electrostatic spray painting device as claimed in claim 6, wherein said thrust magnetic bearing means comprises a stationary annular plate having opposed side walls, and a pair of runners fixed onto said rotary shaft and arranged on each side of said annular plate, each of said runners having a side wall arranged to face the corresponding side wall of said annular plate, said stationary magnet means comprising a pair of stationary permanent magnets, each being fixed onto the respective side wall of said annular plate, said rotary magnet means comprising a pair of rotary permanent magnets, each being fixed onto the side wall of the respective runner.
Claim 9
Dependent Claim
71 words
A rotary type electrostatic spray painting device as claimed in claim 7, wherein annular recesses are formed on the opposed side walls of said annular plate and on the side walls of said runners, said stationary permenent magnets, which have an annular shape, being fitted into the annular recesses of said annular plate, said rotary permanent magnets, which have an annular shape, being fitted into the annular recesses of said runners.
Claim 10
Dependent Claim
33 words
A rotary type electrostatic spray painting device as claimed in calim 1, wherein said electrode means comprises an electrode which is arranged to continuously contact with the rear end of said rotary shaft.
Claim 11
Dependent Claim
19 words
A rotary type electrostatic spray painting device as claimed in claim 9, wherein said electrode is made of carbons.
Claim 12
Dependent Claim
71 words
A rotary type electrostatic spray painting device as claimed in calim 9, wherein the rear end of said rotary shaft has a flat end face extending parpendicular to the rotation axis of said rotary shaft, said electrode being arranged coaxially with the rotation axis of said rotary shaft and having a flat end face which is in contact with the flat end face of the rear end of said rotary shaft.
Claim 13
Dependent Claim
58 words
A rotary type electrostatic spray painting device as claimed in calim 9, wherein said electrode means further comprises an electrode holder fixed onto said housing and having therein a cylindrical hole, into which said electrode is slidably inserted, and a compression spring arranged in the cylindirical hole of said electrode holder between said electrode holder and said electrode.
Claim 14
Dependent Claim
55 words
A rotary type electrostatic spray painting device as claimed in claim 1, wherein said drive means comprises a compressor, an air injection nozzle arranged in said housing and connected to said compressor, and a turbine wheel fixed onto said rotary shaft and having a turbine blade which is arranged to face said air injection nozzle.
Claim 15
Dependent Claim
84 words
A rotary type electrostatic spray painting device as claimed in claim 1, wherein said cup shaped spray head comprises a cylindrical inner wall arranged coaxially with the rotation axis of said rotary shaft and defining therein an annular space, a plurality of paint outlfow bores being formed in the cylindrical inner wall of said spray head and smoothly connected to the cup shaped inner wall of said spray head, said feed means having a paint injection nozzle which is arranged in said annular space.
References Cited (Backward Citations)
No citation records indexed.
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