Electrostatic coating machine employing removable paint cartridge

Provided is an electrostatic coating machine employing a removable paint cartridge, which enable one to clean the paint flow path including coupling parts between the main body of the coating machine and a paint cartridge, with the said coupling parts including the paint outlet of the paint cartridge. The paint cartridge (10) has a stepped sleeve (300) projecting downward from the bottom face thereof and being displaceable up and down. The stepped sleeve (300) has a valve seat (302) for a first check valve (30) formed at the lower end thereof. A movable valve body (304) to fit to the valve seat (302) is energized by an inner peripheral spring (306) in the direction for fitting to the valve seat (302). A hollow (40) of the main body (6) of the coating machine has a secondary hollow (402) for fitting of a smaller-diameter part (300a) of the stepped sleeve (300). At the center of the bottom face of the secondary hollow (402), is opened a paint feeding channel (44).