Accordingly, a coating material is filled in a coating material tank formed in a
coating machines or a coating material is filled in a cartridge mounted detachably to a coating machines and a coating martial is discharged under pressure from the coating material tank or the cartridge for coating thereby electrically shielding the coating material supply system in order not to leak a high voltage even when it is applied to the coating machines (for example, refer to Japanese Unexamined Patent Publication No. 2000-317354).
In the electrostatic coating machines of the type described above, a bottom plate as a piston is slidably located along the inner peripheral surface of a coating material tank or a cartridge as a cylinder and the bottom plate is pushed by other actuator or under a reduced pressure to press-discharge the coating material.
In view of the above, it is a technical subject of the present invention to provide a coating material-filled type coating machines capable of discharging under pressure a paint or like other coating material reliably with a small 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 of the invention can be attained by a 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 for an operating fluid is disposed for exerting a pressure from the outside of the coating material bag thereby discharging the coating material under pressure.