A rotor cup for spinning a fiber material includes a coupling device to detachably connect the rotor cup to a rotor shaft. The coupling device includes a connecting means for transfer of torque from the rotor shaft to the rotor cup and for axial securing of the rotor cup on the rotor shaft, and a centering means for centering the rotor cup on the rotor shaft. The centering means may include a cone-shaped extension or cone-shaped receiver defined on the rotor cup. The connecting means may include an extension on the rotor cup, with the centering means being a centering element separate from the connecting means and defined as one of a cylinder pin fixed in the rotor cup or a centering bore arranged in the rotor cup. An open end spinning rotor may include the rotor cup.

An open-end spinning device having a thread draw-off nozzle and a thread draw-off nozzle for an open-end spinning device, the thread draw-off nozzle having a thread-guiding surface which extends between an entry opening and a draw-off opening and which tapers in the shape of a funnel toward the draw-off opening. In order to provide a thread draw-off nozzle and an open-end spinning device having a thread draw-off nozzle which allows controlled production of the thread, the thread draw-off nozzle has a blocking element, which protrudes from the thread-guiding surface and which has a thread stop surface designed such that the thread stop surface blocks a thread from circulating over the thread-guiding surface.

In an open-end spinning rotor with a rotor cup, and with a rotor shaft, through which the spinning rotor is supported in a bearing, the rotor shaft and the rotor cup are detachably connected to each other through a coupling device. The coupling device includes a positive-locking connection for the transmission of the turning moment between the rotor cup and the rotor shaft, along with a magnetic device for the axial connection of the rotor shaft and the rotor cup. The rotor shaft features at least one projection with a one turning moment-transmitting area, which engages in a recess of the rotor cup with a turning moment-transmitting counter-area. A socket for a permanent magnet is arranged on the rotor cup.

In an open-end spinning rotor with a rotor cup, and with a rotor shaft, through which the spinning rotor is supported in a bearing, the rotor shaft and the rotor cup are detachably connected to each other through a coupling device. The coupling device includes a positive-locking connection for the transmission of the turning moment between the rotor cup and the rotor shaft, along with a magnetic device for the axial connection of the rotor shaft and the rotor cup. The rotor shaft features at least one projection with a one turning moment-transmitting area, which engages in a recess of the rotor cup with a turning moment-transmitting counter-area. A socket for a permanent magnet is arranged on the rotor cup.

An open-end spinning rotor (1), comprising a rotor shaft (2), a rotor cup (3) and a coupling device (4) with a receiving element (5) connected to the rotor shaft (2) and an axle element (6) connected to the rotor cup (3). The coupling device (4) comprises three clamping bodies (7, 8, 9), arranged between a contour (10) of the receiving element and a contour (11) of the axle element. The contour of the receiving element, the contour of the axle element and the clamping bodies are configured such that by driving the rotor shaft, a relative rotational movement is produced between the receiving element and the clamping bodies and the axle element, in that owing to the relative rotational movement, the clamping bodies are clamped between the contour of the axle element and the contour of the receiving element to non-positively transmit a drive torque.

An open-end spinning rotor (1), comprising a rotor shaft (2), a rotor cup (3) and a coupling device (4) with a receiving element (5) connected to the rotor shaft (2) and an axle element (6) connected to the rotor cup (3). The coupling device (4) comprises three clamping bodies (7, 8, 9), arranged between a contour (10) of the receiving element and a contour (11) of the axle element. The contour of the receiving element, the contour of the axle element and the clamping bodies are configured such that by driving the rotor shaft, a relative rotational movement is produced between the receiving element and the clamping bodies and the axle element, in that owing to the relative rotational movement, the clamping bodies are clamped between the contour of the axle element and the contour of the receiving element to non-positively transmit a drive torque.

A yarn comprising gel forming filaments or fibers particularly one used to make a woven or knitted wound dressing or other gelling fabric structure. The invention provides a yarn comprising a blend of from 30% to 100% by weight of gel-forming fibers and 0% to 70% by weight of textile fibers. Process for making the yarns are also described including those using rotor spinning.