for the roving through the resumption of air feeding through the compressed air openings 300 310 into the interior of the torsion element 3 and through the beginning of winding and yarn draw off which may be delayed somewhat in relation to winding the yarn 10 is combined with the roving 1 and the normal spinning process is thus resumed through the reopening of the gap 33 between the injector nozzle 30 and the torsion nozzle 31 as well as of the gap 34 in the holding device 32 when draw off of the spun yarn 10 by bobbin 51 begins and possibly also by the draw off device 4 the air required for the spinning process can be sucked through the gap 33 34 into the interior of the torsion element 3 the sealing device 61 shown in fig1 and 2 is provided with a screen 610 which is fixedly supported and to which the torsion element 3 is associated through its movement from spinning position i into threading position ii the details of a particularly advantageous example of an embodiment of the invention are now explained through fig2 the holding device 32 is here supported on a swivelling lever 35 capable of being swivelled around a bearing bolt 350 a first stop 36 is associated to the torsion element 3 the swivelling lever 35 is subjected to the pull of a tension spring 351 one end of which is attached to the swivelling lever 35 and the.