Process and device to stop an open-end rotor spinning device

A process for producing a short yarn end for piecing in an open-end spinning device of a spinning machine wherein, during normal spinning operations, a fiber sliver is fed to an opener device which combs fibers from the leading end of the fiber sliver, the combed out fibers conveyed along a fiber conveying path to a fiber collection surface of a spinning rotor for incorporation into an end of a continuously withdrawn yarn, said process comprising stopping the feeding of the fiber sliver to the opener device and in synchronization therewith interrupting the flow of fibers from the opener device to the end of the continuously withdrawn yarn in the fiber collection surface so that fibers which continue to be combed out of the end of the stopped fiber sliver which is still in contact with the opener device are substantially simultaneously prevented from being incorporated into the end of the withdrawn yarn, the withdrawn yarn having a resulting yarn end having a defined relatively short length which does not incorporate thinned out fibers from the stopped fiber sliver,

• said interrupting the flow of fibers comprising bringing a suction airstream into action along the fiber conveying path substantially simultaneously with said stopping of feeding of the fiber sliver to the opener device to evacuate fibers conveyed from the opener device.