tension is too little then tool little torsion is present in the strand between the drawing rolls 4 and the point of convergence 12 which results in losses of fibers at the outlet of the drawing rolls 4 as a result of poor interlocking of the fibers for example excellent results have been obtained with a speed of 215 meters per minute with a draw between the drawing rolls 4 and the delivery rolls 10 of 1 53 and a thread of 2 u00d7 25 tex composed of 45 wool of 27 microns and 55 polyester of 3 denier thus the difference in speed between the drawing rolls 4 and the delivery rolls 10 is adjusted as a function of the spinning parameters and the speed of travel if the tension on the other hand is too great the thread is excessively tensioned resulting in the risk of breakage in the event that friction twisting members are employed which assure both a component of twist and a component of advance of the thread it may be of interest to adjust the tension of the thread by varying this component of advance independently of the adjustment of the tension between the delivery and drawing rolls for example when two endless crossed belts are used this adjustment is effected by variation of the angle of the two belts by the present invention the problem of breaking while twisting the assembled intermediate.