Patent ID: 6863466

Claim:
An open-end spinning rotor having a rotor shaft and a rotor cup, the rotor shaft being supported in a spinning-rotor bearing and the rotor shaft and the rotor cup being detachably connected via a coupling device for removal of the rotor cup while the rotor shaft remains supported in the spinning-rotor bearing, characterized in that the coupling device comprises: a) a magnetic device comprised of a permanent magnet fixed to the rotor shaft by a receiving casing having a cylindrical bore that surrounds a corresponding guide attachment on the rotor cup for fixing the rotor shaft and the rotor cup axially with respect to one another solely by magnetic attraction therebetween during spinning operation, and b) a mechanical rotational safety mechanism comprised of an interior polyhedral receiving area in the receiving casing and a mating exterior polyhedral surface on the rotor cup for fixing the rotor shaft and the rotor cup radially with respect to one another.