Abstract: To prevent the formation of remnant thread pieces due to response of a thread cutting apparatus 2, 3, 4 coupled to a thread or yarn cleaning device 36, which erroneously responds with an "off-size" signal upon a thread break, the cutter blade is guided in front of the thread when tensioned--under ordinary conditions--but loose if the thread should be broken. Under tension, movement of the cutter blade 2, 3 will sever the thread; when the thread is slack, the cutter blade can move into a groove 4, 4' of a counter element or anvil, which groove is deeper than the travel of the cutter blade to accomodate the slack thread. For heavier threads, the forward portion of the cutter element can be movable (FIGS. 4-6) to be pulled against a counter surface 14 by a taut thread, but to engage into the deeper groove 4' by a slack thread not having the pulling action on the blade.

Abstract: A suction element (1) has a slit-like suction nozzle portion (20) extending transversely over a cone from which a loose thread end is to be sucked off. The element includes an airflow chamber 22, located between the suction nozzle portion and a vacuum fitting (8), in which two draw-off rollers (2, 3) are positioned, freely rotatable and driven by the air stream flowing from the nozzle opening through the chamber into the suction fitting. The soft elastic force of the suction airflow is transferred to the rollers and then to the thread or yarn being picked or plucked off so that thread breakage upon sudden changes in pull-off resistance are effectively prevented.

Abstract: There is disclosed a nozzle having a pair of rollers arranged at the end over a suction slot. A smooth contact roller of the pair is arranged toward the outside for contacting the surface of a wound thread member rotating against it. The other clamping roller is rotated by contact with the contact roller and spaced back from the wound thread member. The contact roller is movably mounted so that the contact pressure forces it into rolling contact also with the clamping roller. The clamping roller is a multiple worm roller, by which along the contact line of the two rollers there are a series of clamping points which tug at the thread as it is pulled into the nozzle by the suction through spaces separating the clamping points along the length of the rollers. The contact roller may be tapered to a smaller diameter toward the middle, with the clamping roller being correspondingly tapered to a larger diameter toward the middle.