A coating mechanical system possessing a coating fabric discharging mechanism for discharging a previously filled coating fabric below compression to an atomizing mechanism wherein a coating fabric bag for filling a coating fabric is housed in a coating fabric discharging chamber of a predetermined volume and an inlet or exit port of an operating fluid is disposed for exerting a compression from the outside regarding the coating fabric bag thereby discharging the coating fabric below pressure, while crushing the coating fabric gag, whereby paint or like other coating fabric should be discharged below compression reliably by a mini driving force. Within the coating of car bodies, coating fabrics creating use of organic solvents are predominant, but it was demanded to decrease volatile organic solvents that are evolved a good quantity within the coating process with a view of environment protection and prevention of public pollution and, like a outer measure, coating with aqueous coating fabrics has attracted attention. For creating use of an aqueous coating with no loss, it is preferred to apply coating by an electrostatic coating apparatus of high coating efficiency. However, since the aqueous coating fabric has little electric resistance tending to electrically conduct the rotary atomizing head and the ground regarding the electrostatic coating mechanical system by method of a coating fabric flowing through a coating fabric supply system, insulation has to be applied over the entire coating fabric supply system so as to prevent leakage of high voltage of 60 to 90 kV applied to the rotary atomizing head. Accordingly, a coating fabric is filled in a coating fabric tank formed in a coating mechanical system or a coating fabric is filled in a cartridge mounted detachably to a coating mechanical system and a coating martial is discharged below compression from the coating fabric tank or the cartridge for coating thereby electrically shielding the coating fabric supply system sequential not to leak an above voltage even when it is applied to the coating mechanical system for example, refer to Japanese Unexamined Patent Publication No.
Within the electrostatic coating mechanical system regarding the kind described above, a bottom plate like a piston is slidably located along the inner peripheral surface of a coating fabric tank or a cartridge like a cylinder and the bottom plate is pushed by other actuator or below a reduced compression to press-discharge the coating material. However, since the bottom plate and the inner peripheral surface should be sealed reliably, friction increases by so many to need a large driving force. Since the seal is worn by friction on every reciprocation regarding the bottom plate, an operating fluid shall possibly enter to release an undesired effect on the quality regarding the coating in a case of liquid compression driving. Further, since plural O-rings are arranged in parallel to the outer peripheral surface regarding the bottom plate like a piston within the usual seal, the coating fabric intrudes between each regarding the O-rings and this imposes a trouble of decomposing and detaching the bottom plate and clean the similar to upon cleaning subsequent to completion of every day’s job. In view regarding the above, it is a technical subject regarding the present invention to give a coating material-filled kind coating mechanical system capable of discharging below compression a paint or like other coating fabric reliably with a mini driving force without sliding movement of a bottom plate and, accordingly, with no trouble of decomposing cleaning by detaching the bottom plate.
The foregoing object regarding the invention should be attained by a coating mechanical system possessing a coating fabric discharging mechanism for discharging a previously filled coating fabric below compression to an atomizing mechanism wherein a coating fabric bag for filling a coating fabric is housed in a coating fabric discharging chamber of a predetermined volume, and an inlet or exit port for an operating fluid is disposed for exerting a compression from the outside regarding the coating fabric bag thereby discharging the coating fabric below pressure. Within the coating mechanical system according to the invention, when a coating fabric for example a paint is previously filled in a coating fabric by housed in a coating fabric discharge chamber and an operating fluid is supplied to the outside regarding the coating fabric bag, the operating fluid bag is expanded by the liquid compression and the coating fabric bag is crushed by which the coating fabric is discharged below compression by a predetermined quantity and supplied to the atomizing mechanism. As described above, since the coating fabric should be discharged below compression by supplying the operating fluid thereby crushing the coating fabric bag, the compression regarding the operating fluid is exerted as it is on the coating fabric and the coating fabric should be discharged below compression with a relatively mini driving force. Further, since there is no more compulsory to slide the bottom plate, there is no worry of coating failure caused by the leakage within the seal for the bottom late and since there is no gaps through which the coating fabric intrude, cleaning should be conducted simply. In this case, when the coating fabric bag and the operating fluid bag are housed within the coating fabric discharge chamber, even when the operating fluid bag should be broken during use, since the coating fabric is filled within the coating fabric bag, there is no worry that the coating fabric and the operating fluid are mixed within the coating fabric discharge chamber.
In addition, when at fewest portions regarding the coating fabric bag and the operating fluid bag are bound to each other such that the contact faces regarding the coating bag and the operating fluid bag are not positionally displaced from each other, movement regarding the coating fabric bag and the operational fluid bag to each other are restricted when they can be expanded or crushed alternately while repeating filling and discharging regarding the coating fabric and entry and exit regarding the operating fluid, whereby the 3 bags are deformed integrally. Thus, since the contact faces regarding the coating fabric bag and the operating fluid reciprocate as if they were a lone sheet of diaphragm within the coating fabric discharge chamber without forcing only the coating fabric bag, for example, to the corner regarding the coating fabric discharge chamber thereby compressing only the coating fabric bag, this can give an advantageous effect that respective bags are fewer creased or broken. Distant when gaps between the coating fabric bag and the operating fluid bag are filled with a liquid, the compression regarding the operating fluid transfers directly to the coating fabric bag due to the fact that regarding the absence of space gaps, and the quantity regarding the operating fluid supplied and the quantity regarding the coating fabric discharged are created identical. Further, when the coating fabric discharge chamber has a cylindrical inner peripheral surface, the coating fabric bag and the operating fluid bag are not folded even when they can be urged to the coating fabric discharge chamber. Furthermore, in a case where a conductive coating fabric for example an aqueous coating fabric is electrostatically atomized, as the coating fabric by an electrostatic atomizing mechanism, since the coating fabric is filled within the coating fabric bag, high voltage does not leak by method regarding the coating fabric to the outside and there is no requirement for applying insulation countermeasure to the coating fabric supply system.