Wrap-winding spinning machine

A wrap-winding spinning machine including a wrap-winding apparatus for producing wrapped yarns including slivers and at least one thin winding thread, preferably a filament, said wrap-winding apparatus further including a rotor to be driven at very high rpm and a yarn channel coaxial with a rotary axis thereof, said rotor having a rotatably supported, driven hollow spindle and a bobbin having a rotor head, and at least a lower area interchangeably placed on the hollow spindle, said bobbin arranged to carry the winding thread in the form of a thread winding body and further being surrounded in a spaced-apart manner by a yarn-ballooning limiter having an area and a closed circumferential wall, said yarn-ballooning limiter arranged to circumferentially surround said rotor head having an end face located at the top of said thread winding body and arranged to form a narrow annular gap between the circumference thereof and said yarn-ballooning limiter characterized in that said yarn-ballooning limiter has at least one air outlet opening disposed at a distance below said annular gap between said yarn-ballooning limiter and said rotor head, through which air continuously exits, and further wherein air continuously flows from above said rotor head through the annular gap, that said end face of said rotor head is provided with an inlet for said yarn channel of said rotor and is curved in a convex manner such that from the vicinity of the yarn-ballooning limiter up to the inlet of said yarn channel it forms at least substantially a thread guide face on which the winding thread glides.