Thread twist system for twisting and spinning machines
Thread twist system for twisting and spinning machines which comprises means ( 12 ) for measuring and/or calculating directly or indirectly the rotation speed ( 11 ) of the runner ( 5 ), in such a way that the working movements and parameters of the machine keep real twisting constant throughout the process of filling the reel ( 2 ) in a dynamic and instantaneous way, by acting on the angular speed ( 10 ) of the spindles ( 1 ) and/or the feeding ( 9 ) speed of the thread ( 6 ), with the objective of correcting the theoretical twisting on the thread itself ( 6 ) and converting it into real twisting.
1. Thread twist system for twisting and spinning machines including a rotatable spindle, a reel attached to the spindle and disposed to rotate therewith, a ring disposed to extend around the reel, a rotatable runner carried on the ring and being rotatable at a variable rotational speed, and a thread feed pulley disposed to feed thread to the runner at a variable thread feed speed to fill the reel with thread, wherein the thread twist system comprises:
means for determining the rotational speed of the runner; and
means for maintaining the ratio of the runner rotational speed and the thread feed speed at a constant value, whereby torsion variation of the twisted thread is minimized.
2. The thread twist system of claim 1 wherein the means for maintaining the ratio constant includes means for continuously varying the rotational speed of the runner.
3. The thread twist system of claim 1 wherein the means for determining the rotational speed of the runner includes an ultrasound sensor.
4. The thread twist system of claim 2 wherein the means for determining the rotational speed of the runner includes an ultrasound sensor.