Patent ID: 7959771

Claim:
An electrophoretic dip coating plant comprising: at least one dip tank, which is filled with a coating fluid; a conveyor system, which brings the objects which are to be coated up to the dip tank, immerses them in the coating fluid at one end region of the dip tank, carries them through the coating fluid to the other end region of the dip tank, where it moves them out of the coating fluid and away from the dip tank; at least one electrode of a first polarity disposed in the dip tank; a bus bar arrangement which runs along the path of movement of the objects, with which the objects can be brought into electrical contact upon passing through the dip tank and which is galvanically divided into an input and/or output region and at least one main region following in the direction of movement of the objects; a d.c. voltage supply unit, one terminal of which is connected to the electrode of the first polarity and the other terminal of which is connected to the bus bar arrangement, wherein the voltage which is applied to the input and/or output region of the bus bar arrangement can be adjusted independently of the voltage which is applied to the main region a common d.c. voltage supply unit is provided for the input and/or output region and the main region of the bus bar arrangement, the corresponding terminal of which unit is connected to the main region; and, the input and/or output region is connected to the main region of the bus bar arrangement via a controllable semiconductor switch such that the voltage which is applied to the main region can be transferred at a controllable magnitude to the input and/or output region, wherein the controllable semiconductor switch is stationary with respect to the bus bar arrangement while the objects are moved.