PERFECCIONAMIENTOS EN EQUIPOS PARA RECIBIR Y VOLVER A ENTRE-GAR SIN TENSIONES UNA LONGITUD PREVIAMENTE ESTABLECIDA DE UNHILO O ELEMENTO SIMILAR.

摘要

A yarn take-up and supply mechanism for use with textile machines processing yarn, such as during a threading-up operation of the machine, characterized by a construction for coiling a given length of yarn into a single-layer winding to produce a yarn storage and for releasing the stored yarn to the textile machine in a substantially tension-free condition, including the following. A selectively-rotatable elongate drum is operatively mounted at one end on a frame portion of the mechanism and defines an outwardly-extending overhanging free other end for winding of a given length of the yarn on the outside surface thereof. Selectively-operable clamping devices are mounted on and positioned generally at the free end of the drum for receiving a free end of the yarn and for clamping the free end of the yarn during winding of the yarn on the drum and for releasing the free end of the yarn after winding for supplying of the yarn to the textile machine from the surface of the drum by unwinding. A selectively-movable yarn guide device is mounted on the frame for slidably receiving the clamped yarn therethrough and for movement from the free end of the drum rearwardly along the drum for guiding the yarn onto the outside surface of the drum for winding thereof into a coiled single layer permitting subsequent unwinding in a substantially tension-free condition and for releasing the yarn and returning to its starting position after winding. Preferably, selectively-operable suction devices are operatively associated with the clamping devices for cooperating therewith when the clamping devices are open to draw the free end of yarn into the clamping devices for subsequent closing thereof to hold the free end of yarn therein. Also, preferably, selectively-operable compressed air devices are operatively associated with the clamping devices for cooperating therewith when the clamping devices are open for creating a positive compressed air stream to remove the free end of yarn from the clamping devices and for conveying the free end of yarn to a desired location in the textile machine.