Abstract: An apparatus at a spinning room machine, especially a spinning preparation machine, for example a carding machine or draw frame, for visual signal display, has at least two light sources in the form of light-emitting diodes (LEDs), each of which is associated with a cover, the signal display—which is in communication with a control device—being capable of emitting signals of light of different colours. In order to provide an apparatus which especially is of simple construction and allows a reduced outlay in terms of manufacture and installation, a plurality of LEDs, which are located inside a clear or opaque cover, are capable of emitting coloured or white light corresponding to the particular operating situation of the spinning room machine.

Abstract: A method of operating a sliver draw unit of a spinning preparation machine includes the following steps: applying, by incremental rotary displacement sensors, signals to an electronic control and regulating device; determining from the signals the angular position and/or the rotary direction of at least one of the roll pairs of the draw unit during operation and standstill; and rotating at least one of the roll pairs into a predetermined angular position by controlling the electric motor driving that roll pair.