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A film coating apparatus has a nozzle body and a coating material spreading element having an injection hole communicated with the inside of the nozzle body, and formed integrally with the nozzle body. The apparatus further has a rotation support element and a fixing element for rotatably supporting

A film coating apparatus has a nozzle body and a coating material spreading element having an injection hole communicated with the inside of the nozzle body, and formed integrally with the nozzle body. The apparatus further has a rotation support element and a fixing element for rotatably supporting both ends of a piston for a fixed displacement swash plate type compressor and a pair of first coating material applying elements moveably installed above the rotation support element. The first coating material applying elements have a pair of first nozzles which apply coating material in uniform thickness to circumferential outer surfaces of both head parts of the piston. A second coating material applying element is installed above the fixing element such that it can be moved upward and downward and slid laterally to apply coating material in uniform thickness to a bridge part of the piston.

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1. An apparatus for coating a compressor piston, comprising:rotation support means for rotatably supporting both ends of a piston for a fixed displacement swash plate type compressor;a pair of first coating material applying means installed above the rotation support means in a manner such that said

1. An apparatus for coating a compressor piston, comprising:rotation support means for rotatably supporting both ends of a piston for a fixed displacement swash plate type compressor;a pair of first coating material applying means installed above the rotation support means in a manner such that said pair of first coating material applying means can be moved upward and downward, the pair of first coating material applying means having a pair of first nozzles, respectively, which apply coating material to circumferential outer surfaces of both head parts of the piston rotated by the rotation support means, and at the same time spread of a uniform film thickness applied coating material and thereby remove excess coating material, in a state where the pair of first nozzles are placed adjacent to the circumferential outer surfaces of both head parts of the piston;fixing means installed in the vicinity of the rotation support means to fixedly support both ends of the piston; andsecond coating material applying means installed above the fixing means in a manner such that said second coating material applying means can be moved upward and downward and slid laterally, the second coating material applying means having a second nozzle which applies coating material to a bridge part of the piston fixedly supported by the fixing means, and at the same time is slid to spread to a uniform film thickness applied coating material and thereby remove excess coating material, in a state where the second nozzle is placed adjacent to the bridge part of the piston. 2. The apparatus as set forth in claim 1, wherein each of the first and second nozzles comprises:a nozzle body configured to supply coating material; andat least one coating material spreading means defined with at least one coating material injection hole which is communicated with the inside of the nozzle body, and formed integrally with the nozzle body to spread to a uniform film thickness coating material applied through the coating material injection hole to a surface of the piston for the fixed displacement swash plate type compressor in such a way as to remove excess coating material. 3. The apparatus as set forth in claim 2, wherein a lower end surface of coating material spreading means of the first nozzle and a lower end surface of coating material spreading means of the second nozzle are formed as inclined surfaces of predetermined inclination angles to ensure easy spreading of coating material. 4. The apparatus as set forth in claim 2, wherein the at least one coating material injection hole defined in the coating material spreading means comprises one selected from a group consisting of a single slot, a plurality of independent holes, and a combination of a single slot and independent holes. 5. The apparatus as set forth in claim 2, wherein the coating material spreading means of each of the first nozzles comprise, on a lower end surface of said coating material spreading means, a projection formed in a position that corresponds to an annular groove defined on a circumferential outer surface of one of the head parts of the piston for the fixed displacement swash plate type compressor, so as to control an amount of coating material applied in the annular groove. 6. The apparatus as set forth in claim 2, wherein the second nozzle has a pair of coating material spreading means, and the lower end surface of each coating material spreading means of the second nozzle has one cross-sectional shape selected from a group consisting of cross-sectional shapes of a straight line, a first curved line having a predetermined curvature, a second curved line having plural curvatures, a line bent at plural points, and a combination of straight and curved lines, to conform to a corresponding surface outline of the bridge part of the piston for the fixed displacement swash plate type compressor. 7. The apparatus as set forth in claim 6, wherein at least one guide post is provided to the nozzle body of the second nozzle in a manner such that said at least one guide post is brought into sliding contact with the bridge part of the piston for the fixed displacement swash plate type compressor, to prevent the second nozzle from fluctuating during movement thereof and allow a predetermined gap to be defined between a lower end of the coating material spreading means of the second nozzle and the bridge part, to thereby determine a thickness of coated film on the bridge part. 8. An apparatus for coating a compressor piston, comprising:rotation support means for rotatably supporting both ends of a piston for a variable displacement swash plate type compressor;first coating material applying means installed above the rotation support means in a manner such that said first coating material applying means can be moved upward and downward, the first coating material applying means having a first nozzle which applies coating material to a circumferential outer surface of a head part of the piston rotated by the rotation support means, and at the same time spreads to a uniform film thickness applied coating material and thereby removes excess coating material, in a state where the first nozzle is placed adjacent to the circumferential outer surface of the head part of the piston;fixing means installed in the vicinity of the rotation support means to fixedly support both ends of the piston; andsecond coating material applying means installed above the fixing means in a manner such that said second coating material applying means can be moved upward and downward and slid laterally, the second coating material applying means having a second nozzle which applies coating material to both wing parts of the piston fixedly supported by the fixing means, and at the same time is slid to spread to a uniform film thickness applied coating material and thereby remove excess coating material, in a state where the second nozzle is placed adjacent to the wing parts of the piston. 9. The apparatus as set forth in claim 8, wherein each of the first and second nozzles comprises:a nozzle body configured to supply coating material; andat least one coating material spreading means defined with at least one coating material injection hole which is communicated with the inside of the nozzle body, and formed integrally with the nozzle body to spread to a uniform film thickness coating material applied through the coating material injection hole to a surface of the piston for the variable displacement swash plate type compressor in such a way as to remove excess coating material. 10. The apparatus as set forth in claim 9, wherein a lower end surface of coating material spreading means of the first nozzle and a lower end surface of coating material spreading means of the second nozzle are formed as inclined surfaces of predetermined inclination angles to ensure easy spreading of coating material. 11. The apparatus as set forth in claim 9, wherein a projection is formed at a position on a lower end surface of the coating material spreading means constituting the first nozzle, which position corresponds to an annular groove defined on the circumferential outer surface of the head part of the piston for the variable displacement swash plate type compressor, so as to control an amount of coating material applied in the annular groove. 12. The apparatus as set forth in claim 9, wherein the second nozzle has a pair of coating material spreading means, and the lower end surface of each coating material spreading means of the second nozzle has one cross-sectional shape selected from a group consisting of cross-sectional shapes of a straight line, a first curved line having a predetermined curvature, a second curved line having plural curvatures, a line bent at plural points, and a combination of straight and curved lines, to conform to a corresponding surface outline of the wing parts of the piston for the variable displacement swash plate type compressor. 13. The apparatus as set forth in claim 12, wherein at least one guide post is provided to the nozzle body of the second nozzle in a manner such that said at least one guide post is brought into sliding contact with a bridge part of the piston for the variable displacement swash plate type compressor, to prevent the second nozzle from fluctuating during movement thereof and allow a predetermined gap to be defined between a lower end of the coating material spreading means of the second nozzle and wing parts, to thereby determine a thickness of coated film on the wing parts. 14. The apparatus as set forth in claim 9, wherein the at least one coating material injection hole defined in the coating material spreading mean comprises one selected from a group consisting of a single slot, a plurality of independent holes, and a combination of a single slot and independent holes. 15. An apparatus for coating a compressor piston, comprising:rotation support means for rotatably supporting both ends of a half-finished product comprising a pair of unseparated pistons, which is prepared in the course of manufacturing a piston for a variable displacement swash plate type compressor prior to being cut into two pistons;first, second and third coating material applying means; andfixing means installed in the vicinity of the rotation support means to fixedly support both ends of the half-finished product comprising the pair of unseparated pistons;whereinsaid first and third coating material applying means are installed above the rotation support means in a manner such that said first and third coating material applying means can be moved upward and downward, the first and third coating material applying means respectively having first nozzles which apply coating material to circumferential outer surfaces of both head parts of the half-finished product comprising the pair of unseparated pistons, rotated by the rotation support means, and at the same time spread to a uniform film thickness applied coating material and thereby remove excess coating material, in a state where the first nozzles are placed adjacent to the circumferential outer surfaces of the head parts of the half finished product comprising the pair of unseparated pistons; andsaid second coating material applying means are installed above the fixing means in a manner such that said second coating material applying means can be moved upward and downward and slid laterally, the second coating material applying means having a second nozzle which applies coating material to two pairs of wing parts of the half-finished product comprising the pair of unseparated pistons, fixedly supported by the fixing means, and at the same time is slid to spread to a uniform film thickness applied coating material and thereby remove excess coating material, in a state where the second nozzle is placed adjacent to the wing parts of the half-finished product comprising the pair of unseparated pistons. 16. The apparatus as set forth in claim 15, wherein each of the first and second nozzles comprises:a nozzle body configured to supply coating material; andat least one coating material spreading means defined with at least one coating material injection hole which is communicated with the inside of the nozzle body, and formed integrally with the nozzle body to spread to a uniform film thickness coating material applied through the coating material injection hole to a surface of the half-finished product comprising the pair of unseparated pistons in such a way as to remove excess coating material. 17. The apparatus as set forth in claim 16, wherein a lower end surface of coating material spreading means of the first nozzle and a lower end surface of coating material spreading means of the second nozzle are formed as inclined surfaces of predetermined inclination angles to ensure easy spreading of coating material. 18. The apparatus as set forth in claim 15, wherein a projection is formed at a position on a lower end surface of the coating material spreading means constituting the first nozzle, which position corresponds to an annular groove defined on the circumferential outer surface of the head part of the half-finished product comprising the pair of unseparated pistons, so as to control an amount of coating material applied in the annular groove. 19. The apparatus as set forth in claim 15, wherein the second nozzle has a pair of coating material spreading means, and the lower end surface of each coating material spreading means of the second nozzle has one cross-sectional shape selected from a group consisting of cross-sectional shapes of a straight line, a first curved line having a predetermined curvature, a second curved line having plural curvature a line bent at plural points, and a combination of straight and curved lines, to conform to a corresponding surface outline of the wing parts of the half-finished product comprising the pair of unseparated pistons. 20. The apparatus as set forth in claim 19, wherein at least one guide post is provided to the nozzle body of the second nozzle in a manner such that said at least one guide post is brought into sliding contact with a bridge part of the half-finished product comprising the pair of unseparated pistons, to prevent the second nozzle from fluctuating during movement thereof and allow a predetermined gap to be define between a lower end of the coating material spreading means of the second nozzle and the wing parts, to thereby determine a thickness of coated film on the wing parts. 21. The apparatus as set forth in claims 16 , wherein the at least one coating material injection hole defined in the coating material spreading means comprises one selected from a group consisting of a single slot, a plurality of independent holes, and a combination of a single slot and independent holes. 22. The apparatus as set forth in claim 3, wherein the coating material spreading means of each of the first nozzles comprise, on the lower end surface of said coating material spreading means, a projection formed in a position that corresponds to an annular groove defined on a circumferential outer surface of one of the head parts of the piston for the fixed displacement swash plate type compressor, so to control an amount of coating material applied in the annular groove. 23. The apparatus as set forth in claim 3, wherein the second nozzle has a pair of coating material spreading means, and the lower end surface of each coating material spreading means of the second nozzle has one cross-sectional shape selected from a group consisting of cross-sectional shapes of a straight line, a first curved line having a predetermined curvature, a second curved line having plural curvatures, a line bent at plural points, and a combination of straight and curved lines, to conform to a corresponding surface outline of the bridge part of the piston for the fixed displacement swash plate type compressor. 24. The apparatus as set forth in claim 10, wherein a projection is formed at a position on the lower end surface of the coating material spreading means constituting the first nozzle, which position corresponds to an annular groove defined on the circumferential outer surface of the head part of the piston for the variable displacement swash plate type compressor, so as to control an amount of coating material applied in the annular groove. 25. The apparatus as set forth in claim 16, wherein a projection is formed at a position on the lower end surface of the coating material spreading means constituting the first nozzle, which position corresponds to an annular groove defined on the circumferential outer surface of the head part of the half-finished product comprising the pair of unseparated pistons, so as to control an amount of coating material applied in the annular groove. 26. The apparatus as set forth in claims 17 , wherein the at least one coating material injection hole defined in the coating material spre ading means comprises one selected from a group consisting of a single slot, a plurality of independent holes, and a combination of a single slot and independent holes.