Patent GB-1532439-A (GB)
Title: Thread transfer device for a winding machine working without losses
IPC: B65H67/048
Filed: 1975-12-23
Abstract: 1532439 Continuous winding apparatus; transfer tails BARMAG BARMER MASCHINENFABRIK AG 23 Dec 1975 [23 Dec 1974] 52577/75 Heading D1J This invention relates to a continuous winding apparatus of the kind in which two tube supporting chucks 9, 9, Fig. 1, are mounted on a rotatable bobbin revolver 12, and in which there is a friction roller 7 on a carriage 2 that is slidable to and from the bobbin revolver 12, the carriage 2 containing a thread traversing means for traversing- a thread guide member 4; the arrangement being such that the revolver 12 is rotatable between (1) a winding position in which one of the tubes or a package thereon is in contact with the friction roller 7; and (2) a thread changing position, Fig. 2, in which an empty bobbin tube 10.2 and a fully wound package 11 are simultaneously in control with the drive roller 7. According to the invention there is an auxiliary thread guide comprising a shank portion 17, Fig. 3, having a thread guide edge 22 at its free end, and an automatic thread catching eye 21 at the transition from the shank 17 to the edge 22. This auxiliary thread guide is carried by a piston and cylinder unit 16, Fig. 1, operable such that the thread guide edge 22 can be rotated about the axis of the unit 16 into the plane of reciprocation of the thread 14 so that as the thread is traversed from right to left by a traverse member 4, the thread moves along the guide edge 22 and into the eye 21. The shank 17 and edge 22 are then swung away from the traverse plane of the traverse member 4 and this causes a loop of the thread being wound to be pulled out by the eye 21 in the form of a first thread length stretching from the eye 21 up to a fixed eye 8 and a second thread length stretching from the eye 21 over a rigid mandrel 18 and down to the package 11 that is still being wound. The piston and cylinder unit 16 is now actuated to extend the piston thereof such that the thread guide edge 22 descends to the broken line position shown in Fig. 2, the thread guide edge 22 being then swung inwardly under the empty tube 10.2 that has by now been moved into engagement with the drive drum 7. The rigid mandrel 18 is formed with two conical portions 24, 25, Fig. 3; and at this stage of the operation the thread that extends downwardly from the fixed eye 8 to the thread catching eye 21 passes over the conical portion 24; whilst the thread that exetnds from the package 11 to the thread catching eye 21 passes over conical portion 25. As the thread guide edge 22, in the lowermost setting shown in Fig. 2, swings towards the package 11, that length of the thread that extends downwardly from the fixed eye 8 is guided by the conical surface 24 into the range of a thread catching notch 43, Fig. 1, on the empty tube 10.2. As a result, thread coming from the eye 8 is wound onto the empty tube 10.2 and, further, the thread extending between the empty tube 10.2 and the package 11 becomes tensioned and breaks, the broken length being wound onto the package 11. A pin 27, Fig. 3, now slides to the broken line setting to force the thread being wound onto the surface 25. The thread slides down the surface 25, along the mandrel 18 and into the traversing member 4 so that the winding of the fresh package can commence. Transfer tail. While the thread is forced over the surface 24 by movement of the pin 27, a transfer tail is wound on the empty tube 10.2.