Abstract: A yarn supply apparatus for textile machines, particularly for knitting machines, has a rotatable yarn supply means supplying yarn under essentially slipless conditions to the textile machine; a speed controlled motor coupled to the yarn supply means controls the rotation of the yarn supply means. A movable yarn tension element is positioned in the path of yarn from the yarn supply means to the textile machine and is subjected to a bias force means that determines the yarn tension. A yarn reserve zone is formed in the path of the yarn from the yarn tension element to at least one of the yarn guide elements, the size of this zone depending on the position of the yarn tension element. Coupled with the yarn tension element is a transducer that provides a signal representative of the position or movement of the yarn tension element to an electrical circuit that includes the drive motor.

Abstract: A yarn supply element (5, 150) that supplies the yarn substantially without slip and is rotatably supported has yarn guide elements (14, 15, 16; 158) and is coupled to an electric motor (3) of regulated frequency that drives it. In the yarn travel path following the yarn supply element, there are yarn tension sensing means (21) that monitor the yarn (17) unwinding from the yarn supply element and that emit and electrical signal that is supplied to a control circuit (52), which supplies the motor with a frequency signal. To assure satisfactory yarn supply even in the event of abrupt changes in yarn utilization, a device (21, 19) for forming a yarn reserve is provided along the yarn travel path following the yarn supply element. The size of the yarn reserve is dimensioned to be sufficient to cover the yarn requirement during start up of the motor. Associated with this device are means (28, 50-55) for automatically refilling the yarn reserve to an original size no later than after the startup of the motor.

Abstract: A yarn feeding apparatus for yarn-processing textile machines such as circular knitting machines has a feed element which advances the yarn with its circumference. The feed element is rotatably supported on a holder which is arranged to be secured on a carrier and has yarn guide and/or monitoring devices for the yarn being fed to and/or delivered by the feed element. The feed element is driven by a regulated electric motor disposed on the holder. To provide for yarn feeding apparatus which is both compact and inexpensive, the electric motor is a stepping motor coupled to at least one yarn feed element, which advances a yarn in a slip-free manner with its circumference, each element having its own yarn guide and monitoring devices associated with it.

Abstract: An apparatus intended particularly for pulling filamentary spooled material, such as yarn, from a spool has a spool holder, receiving the spool, and a flyer arm, preferably rotatably supported about the axis of the spool. The flyer arm carries yarn guide elements for the spooled yarn arriving from the spool and traveling to a yarn user. In order to assure gentle, regulated pulling off of the spooled material, the arrangement is such that the flyer arm and/or the rotatably supported spool holder is coupled with a speed controlled electric drive motor, and the flyer arm has sensing means which scan the spooled yarn arriving from the spool and emit an output signal representative of the spooled yarn travel speed with respect to the flyer arm. The speed of the drive motor is synchronized with the output signal of the sensing means.

Abstract: A yarn supply apparatus for yarn-using textile machinery has a rotatable yarn supply element (4) supplying yarn under slip free conditions at a predetermined tension, which is driven by a speed-controllable electric drive motor (6), the speed of which is controlled in accordance with the output signal of sensing means (7, 9) monitoring the travel speed of the yarn (11) supplied by the yarn supply element. In order to provide an apparatus which operates independently of external synchronizing means, the arrangement is such that the speed of the drive motor is synchronized with the sensing means output signal (36), which is representative of the yarn supply speed, and the sensing means (7, 9) are located at a distance behind the yarn supply element (4), as viewed in the direction of yarn travel.

Abstract: A yarn storage and delivery arrangement, particularly for textile machines, has a storage drum (4) that has a number of elongated yarn support elements (12) arranged evenly around the circumference at equal radial distances from the drum axis; and having yarn storage contact sections (13) to store several loops or turns of a storage winding. To achieve a simple, low-inertia design of the storage drum, the yarn support elements (12) are formed by U or L-shaped narrow bails or wire elements fastened at least at one end to the drum body (5) and guided at the other end by the drum body or a part connected thereto.

Abstract: A yarn brake, particularly for textile machines, has a pivoted, low-inertia yarn drum that is wrapped several times by yarn in a slip-free manner in a yarn contact section and is non-rotatably secured to a low-inertia armature of a controllable electric motor which is driven by the moving yarn against its impressed sense of rotation.

Abstract: To prevent formation of kinks or twists upon uncontrolled removal of yarn from a storage drum, an intermediate yarn guide element 20 is located between the lower edge 18 of the storage drum and the pull-off guide eye, the intermediate yarn guide element 20 being formed with at least one yarn guide edge located laterally with respect to the axis of rotation 24 of the drum 1 and in the path of the yarn from the storage winding to the removal guide eye. The yarn guide edge is extended to terminate into an elongated narrow guide slot 23 formed in the intermediate yarn guide element, the slot extending from the guide edge inwardly towards the axis of rotation of the drum.