Fluid sprinkling – spraying – and diffusing – Electrostatic type – With impeller
Patent
1998-03-18
2000-01-04
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Electrostatic type
With impeller
239112, 239223, 239290, 239600, B05B 500
Patent
active
060100842
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the invention
This invention relates to a paint spraying apparatus particularly suitable for use, for example, in coating paint on vehicle bodies or the like.
2. Discussion of the Background
Generally, paint spraying apparatus which are in wide use for coating a paint on vehicle bodies or the like are largely constituted by a color changing valve assembly unit which is connected to a multi-color paint source for supplying paint of specified colors selectively from the multi-color paint source, and a paint applicator unit which is connected to the color changing valve assembly unit to spray a paint toward an object to be coated. In a paint spraying apparatus of this sort, in many cases, the paint applicator unit is either mounted on a coating robot or on a reciprocator which is located or installed in a plate remote from the color changing valve assembly, and connected with the latter through a number of paint feed pipes.
In a paint spraying apparatus of this class, for the purpose of enhancing the efficiency of paint deposition on a coating object, a high voltage is applied to the paint applicator unit by the use of a high voltage generator, letting charged paint particles sprayed by the paint applicator unit fly along an electrostatic field which is formed toward the coating object which is retained at the earth potential.
Further, the paint applicator units which are generally used on the paint spraying apparatus of this sort can be classified into a rotary atomizing head type paint applicator unit having a rotary atomizing head which is put in high speed rotation by an air motor to spray a paint supplied from a color changing valve assembly, and a spray gun type paint applicator unit adapted to spray a paint supplied from a color changing valve assembly, along with compressed air or under pressurized air.
Further, the paint applicator units which are in use on the paint spraying apparatus of this sort can also be classified into a straight type paint applicator unit having a housing which is rectilinearly straight in shape for spraying a paint in a straightforward direction and which is suitable for coating surfaces with relatively simple shapes or contours like exterior surfaces of vehicle bodies, and a bend type coating unit having a housing which is angularly bent and suitable for spraying a paint in an angular direction off its axis for coating surfaces with relatively complicate shapes or contours like interior surfaces of vehicle bodies.
In this connection, Japanese Patent Laid-Open No.H6-134354 discloses an electrostatic paint coating apparatus which is generally constituted by a synthetic resin casing, an air motor assembled into the resin casing, a rotary atomizing head mounted at the fore distal end of a rotational shaft of the air motor, and a paint nozzle assembly which can supply paint of different colors to the rotary atomizing head. In this instance, the paint nozzle assembly is provided with a plurality of paint nozzles exclusively for the respective colors which are available, without necessitating the wasting residual paint each time the paint color is changed.
Also disclosed in Japanese Patent Laid-Open No.H7-213957 is an electrostatic paint coating apparatus consisting of a single machine body including an air motor assembled into the machine body, a rotary atomizing head mounted at the fore distal end of a rotational shaft of the air motor, a paint feed pipe for supplying paint to the rotary atomizing head, and a color changing valve mechanism assembled into the machine body in a position on the rear side of the air motor and having a plurality number of paint feed valves in association with a washing valve. In this case, a paint feed passage which connects the paint feed valves with the rotary atomizing head is shortened to minimize the amount of paint which has to be wasted at the time of changing the paint color.
In this regard, of the prior art paint spraying apparatus mentioned above, the paint spraying apparatus which has a color changi
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Matsuda Hidetsugu
Yoshida Osamu
ABB Industry K.K.
Ganey Steven J.
Kashnikow Andres
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