Abstract: A painting machine unit including a painting booth having a side wall with a substantially vertical wall portion insertable in an opening in the booth side wall and having a viewing window therethrough. The unit also includes a painting machine attached to an inner side of the wall portion and has a device for automatic painting of objects within the booth, and a control unit for controlling the device for automatic painting of objects within the booth. The control unit attaches to an outer side of the wall portion and is surrounded by a control chamber housing for accommodating painting booth operator.

Abstract: An electrostatic spray coating method where an electrical field is generated between a spray gun and an object for electrostatically attracting the paint to the object for coating the same. A positive or negative voltage is preliminarily applied to the object through a clamping device disposed on a floor face of a spray booth with the spraying system for spraying the paint from the spray gun being electrically grounded while the object is maintained electrically insulated by suspending it from a hanger rod with an insulator of a hanger conveyor type installed in the spray booth.