Electrode roller with flexible current transmitting disc

A pendulum roller head for a resistance seam-welding machine comprising:

• a stator, a rotor including an electrode roller and a shaft which carries the electrode roller at one end of the shaft and which is rotatably mounted at the opposite end of the shaft in the stator of the pendulum roller head, a sliding contact current transmission device arranged between the stator and rotor and urged against at least one of them by spring force, and ducts for passage of a coolant in the stator, the rotor and the sliding contact current transmission device, wherein the sliding contact current transmission device has at least one annular disc which extends radially between the rotor and stator, makes contact at the inner circumference with one of the stator and rotor and at the outer circumference with the other of the stator and rotor and is flexibly designed in an intermediate bridging part between the inner and outer circumferences, and the annular disc is located as a part of the sliding contact current transmission device between the rotor and the stator in the region of the opposite end of the shaft.