Freed-fiber spinning devices

In a freed-fiber spinning device having a hollow rotor mounted for high speed rotation and being subjected to a partial vacuum in its hollow interior, means for delivering textile yarn from the interior of said rotor along the geometrical axis of the rotor, a yarn exit tube having an entrance end communicating with said yarn delivering means and the partial vacuum in said rotor for receiving the yarn therein, take-up means for drawing the yarn through the exit tube, and an elbowed portion in said yarn exit tube for modifying the direction of the path of the yarn as it passes through the exit tube, the improvement comprising;

• a recess penetrating through the elbowed portion of the yarn exit tube in the zone of the generator-line having the shortest radius of curvature of said elbowed portion;
• a detachable member having a configuration identical with the configuration of the portion of the tube removed to form said recess so that the detachable member fits in position against the periphery of said recess and has inner and outer surfaces ensuring respectively the continuity of the inner and outer surfaces of said exit tube interrupted by said recess;
• a false-twist rib integrally formed in one piece with said detachable member and extending thereon across the geometrical plane formed by a length of yarn upstream and a length of yarn downstream of said rib so that said rib is disposed within said yarn exit tube and said yarn passes against said rib as it is drawn through the exit tube by said take-up means;
• said false-twist rib having a rounded cross-section against which said yarn passes;
• and
• a removable retaining means for stationarily fixing said detachable member in said recess.