Abstract: The invention concerns a fiber feed element 1 of a rotor spinning machine. A bearing surface formed on the lower side 2 of the fiber feed element 1 can be disposed above a opening cylinder for the processing of the initial fiber material. A pivotably borne fiber channel plate can be supported on an upper side 5 of the fiber feed element 1. A fiber guide channel 4 is fashioned into the fiber feed element 1 and extends from the bearing surface up to the support surface. The fiber feed element 1 is made from fiber-glass-reinforced plastic with a fraction of 30 to 60% glass fibers. Use of a composite material allows the conventional fiber feed element to be more simply constructed and produced.

Abstract: A side disc (2) for axial introduction onto a support disc (1) for a support disc bearing of the rotor of an open-ended rotor spinning machine having at least one reflecting region on the side of the side disc (2) facing a light source which is being otherwise substantially non-reflecting, wherein the reflecting region in the side disc (2) has one or more reflectors (3) worked into the side disc, is characterized in that the side disc (2) is made from injection moulded transparent and preferentially colourless plastic, and the reflectors (3) are fashioned on the side of the side disc (2) facing away from the light source in a form of cats-eye structures, and the region of the formed reflectors (3) is stepped-back with respect to other portions of the side of the side disc (2) facing away from the light source, and a fitted member (5) is provided for which is mounted into a recess (6) of the side disc (2) containing the reflector (3) and which completely covers, in a dust-tight manner, the region of the corres

Abstract: A supporting ring for a supporting ring bearing of the rotor of an open end rotor spinning machine for the optical control of a joining carriage and having at least one reflecting region on an otherwise substantially non-reflecting axial ring surface (2) of the supporting ring (1) facing a light source, wherein one or more cupped receptacles (6) are provided for in the ring surface (2) into which reflectors (3) can be inserted and secured, and wherein an interruption of a rotational motion of the supporting ring (1) about a rotational axis (4a) is optically recognized by the joining carriage to start a joining carriage execution procedure, is characterized in that the depth of a receptacle (6) is larger than the thickness of a reflector (3) which can be placed therein. In this fashion the disadvantages of conventional supporting rings having reflectors can be avoided and optimal reflection can easily be restored at any time after wear of individual reflectors.