coating machines
coating machines having a coating material discharging mechanism for discharging a previously filled coating material under pressure to an atomizing mechanism wherein a coating material bag for filling a coating material is housed in a coating material discharging chamber of a predetermined volume and an inlet/exit port of an operating fluid is disposed for exerting a pressure from the outside of the coating material bag thereby discharging the coating material under pressure, while crushing the coating material bag, whereby paint or other coating material can be discharged under pressure reliably by a small driving force.
Claims
What is claimed is:
1. coating machines having a coating material discharger configured to discharge a coating material under pressure to an atomizer wherein a coating material bag for fillingthe coating material is housed in a coating material discharging chamber of a predetermined volume, and an inlet/exit port of an operating fluid is disposed in the material discharging chamber for exerting a pressure from outside of the coating materialbag thereby discharging the coating material under pressure; wherein plural coating material bags are provided in the coating material discharging chamber, and switching valves are interposed in coating material discharge flow channels from each of thecoating material bags to the atomizer to selectively supply the coating material from one of the coating material bags to the atomizer during entering of the operating fluid.
2. The coating machines according to claim 1, wherein the coating material bag is formed in one of a tubular shape and a balloon shape, and having a connection port formed at one end thereof.
3. The coating machine according to claim 1, wherein the inside of the coating material discharge chamber is formed as a cylindrical inner peripheral surface.
4. The coating machines according to claim 1, wherein an electrostatic atomizer is provided as the atomizer to electrically charge conductive coating material particles to be atomized to or a polarity opposite to that of an object to becoated.
In the coating machine according to the invention, when a coating material such as a paint is previously filled in a coating material by housed in a coating material discharge chamber and an operating fluid is supplied to the outside of thecoating material bag, the operating fluid bag is expanded by the liquid pressure and the coating material bag is crushed by which the coating material is discharged under pressure by a predetermined amount and supplied to the atomizing mechanism.
As described above, since the coating material can be discharged under pressure by supplying the operating fluid thereby crushing the coating material bag, the pressure of the operating fluid is exerted as it is on the coating material and thecoating material can be discharged under pressure with a relatively small driving force.
Further, since there is no more required to slide the bottom plate, there is no worry of coating failure caused by the leakage in the seal for the bottom late and since there is no gaps through which the coating material intrude, cleaning can beconducted simply.
In this case, when the coating material bag and the operating fluid bag are housed in the coating material discharge chamber, even when the operating fluid bag should be broken during use, since the coating material is filled in the coatingmaterial bag, there is no worry that the coating material and the operating fluid are mixed in the coating material discharge chamber.
In addition, when at least portions of the coating material bag and the operating fluid bag are bound to each other such that the contact faces of the coating bag and the operating fluid bag are not positionally displaced from each other,movement of the coating material bag and the operational fluid bag to each other are restricted when they are expanded or crushed alternately while repeating filling and discharging of the coating material and entry and exit of the operating fluid,whereby the two bags are deformed integrally.
Thus, since the contact faces of the coating material bag and the operating fluid reciprocate as if they were a single sheet of diaphragm in the coating material discharge chamber without forcing only the coating material bag, for example, to thecorner of the coating material discharge chamber thereby compressing only the coating material bag, this can provide an advantageous effect that respective bags are less creased or broken.
Further when gaps between the coating material bag and the operating fluid bag are filled with a liquid, the pressure of the operating fluid transfers directly to the coating material bag because of the absence of air gaps, and the amount of theoperating fluid supplied and the amount of the coating material discharged are made identical.
Further, when the coating material discharge chamber has a cylindrical inner peripheral surface, the coating material bag and the operating fluid bag are not folded even when they are urged to the coating material discharge chamber.
Furthermore, in a case where a conductive coating material such as an aqueous coating material is electrostatically atomized, as the coating material by an electrostatic atomizing mechanism, since the coating material is filled in the coatingmaterial bag, high voltage does not leak by way of the coating material to the outside and there is no requirement for applying insulation countermeasure to the coating machines supply system.
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