Patent ID: 6920746

Claim:
An open-end spinning device for spinning fibers into a yarn, the spinning device comprising a rotor housing, a spinning rotor disposed for rotation in the rotor housing for receiving the fibers to be spun into the yarn, a yarn withdrawal nozzle for withdrawal therethrough of the yarn, the spinning rotor having a circumferential rotor groove at a greatest inside diameter within the rotor for collecting the fibers to be spun into yarn, and the rotor defining a lagging fiber tie-up zone at which a yarn shank extends from the yarn withdrawal nozzle to the rotor groove in a curvature at least in the vicinity of the rotor groove counter to the direction of rotation of the rotor, a rotor insert rotatably supported within the rotor coaxially therewith, and a drive arrangement for causing the rotor insert to rotate in the direction of rotation of the spinning rotor at a rotational speed retarded during spinning operation from the rotational speed of the spinning rotor by an amount corresponding substantially to a lag of the tie-up zone, the rotor insert comprising a guide portion for guiding the yarn shank between the rotor groove and the yarn withdrawal nozzle and for supporting the curvature of the yarn shank counter to the direction of rotor rotation in all spinning phases.