Treatment Device for Workpieces, Comprising an Electric Treatment Unit

A method for operating a treatment device which includes a treatment chamber, a shaft extending through a wall in the treatment chamber into the treatment chamber and which is mounted rotatably, an electric treatment unit fastened to the shaft, a power supply arrangement including a first supply line, an electric coupling, a second supply line and an actuating unit, wherein the electric coupling includes a first coupling element fastened to the shaft outside the treatment chamber and a second coupling element, wherein the first supply line connects the electric treatment unit to the first coupling element, wherein the second supply line is connected to the second coupling element, and wherein the actuating unit is configured to actuate the electric coupling so as to bring the second coupling element into contact with the first coupling element or so as release the second coupling element from the first coupling element, the method comprising:

• operating the treatment device in a first operating state, in which the second coupling element is in contact with the first coupling element;
• or
• operating the treatment device in a second operating state, in which the second coupling part is released from the first coupling element.