Abstract: A device for collecting yarns on conical reels which compensates for the take-up pulsations of the thread winding onto the conical reel. The device comprises a fixed bar compensator at an adjustable oblique angle with respect to the winding line of the thread which varies the length of the free path of the traversing thread.

Abstract: Thread-guiding device for collecting spun yarns on bobbins, particularly for open-end spinning frames, constituted by a common thread-guiding rod which carries the thread-guides for the spinning stations, said rod being operated in alternate movement in front of the bobbins being formed by a linear electric motor driven by the control unit of the spinning frame in its alternate backward and forward movement as regards instantaneous speed, amplitude of excursion, axial coordinates of the ends of the travel of the thread-guiding rod.

Abstract: Thread-guiding device for collecting spun yarns on bobbins, particularly for open-end spinning frames, constituted by a common thread-guiding rod which carries the thread-guides for the spinning units, driven in alternate movement in front of the bobbins being formed by the motion of a driving means controlled in turn by a motor capable of alternate rotation and controlled by the control unit of the spinning frame in its alternate clockwise/counterclockwise movement as regards instantaneous speed, amplitude of angular excursion, angular coordinates of the ends of its travel.

Abstract: A reel-stick arm for winding yarn with regulated pressure between the reel and its actuation roller, particularly for double-twist twisting frames, comprising automatic means for balancing the effect of weight variation of the reel being formed, means for automatic raising of the reel-stick arm, and automatic means for clamping the arm in the raised position, said raising and clamping means being co-ordinated by interlocking means.

Abstract: Device for collecting yarns on conical reels with compensation of the take-up pulsations of the thread from the conical reel with a fixed bar compensator at an oblique angle with respect to the winding line of the thread which varies the length of the free path of the traversing thread.

Abstract: The present invention provides a method for monitoring the soundness and quality of a twisted yarn produced in a double twist spindle of a twisting frame.The invention also provides a device for implementing said monitoring of the soundness and quality of the twisted yarn which is produced in the spindle and undergoes the movement necessary to feed the bobbin under formation.

Abstract: There is described an automatic device for restarting a two-for-one twisting station after yarn interruption, the device being provided on a carriage which patrols the twisting machine faces and is equipped to discharge a completed bobbin, seize the yarn ends from the feed side and the bobbin side and convey them to a joining device, join said ends, pick up a new tube and position it on the bobbin carrier arm, bring the yarn ends on the feed side up to it and restart the station, so restoring the yarn flow.

Abstract: A method for pneumatic threading in a two-for-one twisting spindle having a double hollow mandrel. The method comprising seizing the initial portion of wound yarn from a bobbin positioned on the lower hollow mandrel in the spindle basket and feeding a sufficient length of it through the upper hollow mandrel to enable it to be then placed alongside the initial wound yarn portion unwound from the bobbin mounted on the upper hollow mandrel. The two initial yarn portions are then held jointly and rested on the mouth of the upper hollow mandrel, on which a head connected to a compressed air source is placed and pressed, in order to achieve pneumatic yarn threading.

Abstract: This invention relates to a method for pneumatic threading in a double-twisting doubling frame having a double hollow pin twisting spindle, in which the two thread feeding bobbins are disposed coaxially, one above the other, in the head of the spindle, and each individual bobbin engages its own hollow pin, this method providing for removing the initial length of thread from the lower bobbin in order to advance it into the hollow pin of the upper bobbin and also removing the initial length of thread from the upper bobbin and holding together the two said initial lengths of thread so that they rest on the inlet of the upper hollow pin, a head connected to a source of compressed air coming towards and being pressed against said upper hollow pin, allowing for both the lateral displacement of the braking device and the injection of compressed air for pneumatic threading.

Abstract: An automatic device for positioning a mechanical yarn feeler against a yarn. An extendable arm is provided with a magnet at one end. The magnet is held in a pivotable base which pivots within a limited range on the arm. The magnet actively engages the feeler when the arm is extended and as the arm retracts to lower the feeler onto the yarn, the magnet rotates with respect to the arm. When the magnet rotation reaches its limit, the magnet disengages the feeler and the feeler becomes passively supported on the base. The feeler is then further lowered to rest against the yarn and the arm retracted out of engagement with the feeler.

Abstract: A device for feeding a conical tube to a bobbin support arm and positioning it thereon, consisting of a rotatable extendable arm having an articulated wrist provided with three fingers which grip the picked-up tube, the axes of rotation of the arm and wrist being both parallel to the axis of the bobbin drive cylinder.