of the fluted roller were here controlled by a time relay then different lengths of yarn would be fed back into the spinning turbine for different turbine speeds since a certain length of yarn is required for the start of spinning phase which length is dependent on the diameter of the spinning turbine the fluted cylinder 5 must be controlled so that during its reverse rotation it rotates through a fixed angular distance i e a point on its periphery traverses a path of predetermined length the constant length yarn feedback is feasible for instance by variation of the reverse time constants in dependence on the spinning speed or start of spinning speed or by direct control of the reverse motion path or reverse motion angle through an angular distance transmitter attached to the shaft 63 at this time again controlled by a time relay the so called start of spinning phase begins which is effected by placing the electromagnetic couplings in the following states starting from shaft 26 which is constantly driven by shaft 13 shaft 45 is driven via closed coupling 36 pulleys 37 38 39 and 40 shaft 58 pulleys 41 and 42 and a reduction gear 44 this shaft 45 drives shaft 54 via intermediate shafts 49 and 51 by means of gears 46.