device 4 and is driven via a friction roller 11 during the winding travel the removal of the finished cheeses 8 takes place by means of a cheese transport device 12 extending over the length of the machine the work stations 2 of the open end spinning rotor machine 1 are serviced by an automatically operating service unit 10 which is supported on rails 14 14 39 by its undercarriage 17 the rails 14 14 39 preferably extend in the superstructure of the open end spinning machine 1 it is known from numerous references and therefore not shown in greater detail that the service unit 10 has a plurality of manipulating devices for piecing or changing the cheese among other things such a service unit 10 has an unlocking lever 13 by means of which the open end spinning device 3 can be opened and closed as needed and a cleaning head 16 for cleaning the spinning rotors 15 cleaning of the spinning rotors is periodically performed preventively as well as after a yarn break the cleaning head 16 can be extended by means of a drive 19 in the direction of the spinning housing 20 of the open end spinning device 3 both the unlocking lever 13 and the cleaning head 16 are standard components known per se of such service.