Arm device for a milking-parlour arrangement for the automatic milking of milk-producing animals, divider for a milking-parlour arrangement, and milking-parlour arrangement

An arm device (6) for a milking-parlour arrangement for the automatic milking of milk-producing animals comprises an arm (10) and a holder (11), which is coupled to the arm in a pivotable manner and has a milking cluster (5), wherein the arm (10) is connected to an arm-drive shaft (12) and is mounted such that it can be rotated about an arm axis, wherein a holder-drive shaft is mounted in the arm-drive shaft (12) such that it can be rotated independently of the arm-drive shaft (12), wherein the arm-drive shaft (12) and the holder-drive shaft are designed such that they can be coupled to a drive unit (9), wherein the arm device (6) has at least one transmission element in the form of a pulling means for transmitting rotary or pivoting movements. The at least one transmission element is fixed in each case to respective wheels, with which it interacts in order to transmit rotary or pivoting movements. The invention also relates to a divider for a milking-parlour arrangement having said arm device (6), and to a milking-parlour arrangement.