Thread-guiding unit, open-end spinning machine and method for operating a spinning station

A thread guide unit for drawing off a thread out of a rotor of a spinning unit of an open-end spinning machine, comprising:

• a draw-off tube, the draw-off tube having a first end, an opposite second end, and a continuous inner diameter surface between the first end and the opposite second end, wherein the draw-off tube is configured such that during spinning operations at the spinning unit, the first end is adjacent and concentric with an open-end of the rotor to draw a spun yarn out from a center of the rotor and into the draw-off tube;
• a compressed air nozzle configured with the draw-off tube;
• a thread outlet element extending into the second end of the draw-off tube;
• the compressed air nozzle comprising a mouth formed as a gap between the inner diameter surface of the draw-off tube and the thread outlet element, wherein compressed air is directed into and along the gap from the compressed air nozzle;
• and
• means for generating a vortex in the compressed air flowing through the gap and into the draw-off tube to generate or maintain a twist in the thread in the draw-off tube.