Patent GB-191218572-A (GB)
Title: Improved Process and Apparatus for Piecing Warp Threads.
Inventor: WENZEL MAX
IPC: D03J1/16
Filed: 1912-08-13
Granted: 1913-08-07
Abstract: 18,572. Wenzel, M. Aug. 13. Warp threads, uniting.-The warp threads are united by whipping a special thread round their juxtaposed ends. In one form of apparatus. the two threads a, b, Figs. 3 and 4, to be united are separated from the remaining threads, arranged in the usual crossed condition, and are moved between the two parts e, e<1>, Figs. 3, 4, 7, and 9, of the opened whipping- appliance, and are inserted between clamps 2, 3. The part e<1> carries a whipping-thread spool 4 and thread-guide 5, the part e being counterweighted, while both parts are supported by sliding bearings h, i and are normally prevented from rotating by pawls k', k. The end' of the whipping-thread c is gripped between the spring-closed jaws of a holding and clamping device 7 carried by a transversely rocking lever. The bearings h, i are raised by means of a cam q, the pawls k, k<1> being disengaged by stops v, v<1>. The whipping-appliance is thus closed, and is then rotated by an endless cord or rope l. The framing T carrying the bearings h, i is rocked about pivots 17, 17<1>, the rotating whipping-appliance being thus caused to travel towards the clamps 2 and back again to the clamps 3 so that the whipping-thread c is wound round the threads a, b, the holder 7 retaining the end of the whipping-thread for some time and then releasing it. A gripper 8, controlled by cam-and-lever mechanism, then pulls out sideways the whipping-thread extending from the completed whipping to the spool. 4, the thread being cut and gripped again by the holder 7. The united threads are then removed, and a fresh pair placed into the whipping-appliance. In a modification, the whipping-thread, extends from its spool 4, Fig. 25, situated outside the whipping-appliance e to a special clamping and severing device 49, from which the end of the whipping-thread is conveyed by a special device into position to be engaged by a gripper on the whipping- appliance supported by a frame T. This frame oscillates on pivots on a base-plate 125 during the whipping operation. The lower end of the whipping-thread is cut by the device 49, and, as the whipping-appliance rotates, the whipping-thread is first wound in a groove therein and is then wound round the threads a, b to be united. The threads tied together in bunches extend over lease-rods 116, 117, 118, 119, and the threads from a pair of bunches are brushed straight and then placed in clamps 120, 121, which may be fixed to the base-plate 125. During the piecing operation, the apparatus is traversed across the fixed warps by a conveyer screw 124 engaging a nut 126 on the base-plate 125, the warp threads being brought into position between the clamps 2, 21 and 3, 3<1> of the whipping-appliance by means of grippers. The screw 124 is rotated in a forward direction by a feed - mechanism according to the closeness of the warp threads, and is rotated backwards by hand. In another modification, several pairs of warp threads are simultaneously united, the whipping-threads being supplied as in the modification just described. The whipping-appliances comprise toothed disks e, Figs. 27 and 32, having radial insertion slots 3<x> and mounted in a carrier, which is caused to slide on rods by cam-and-lever mechanism. the disks being simultaneously rotated from a broad spur-wheel rotated through mutilated spur gearing &c. from the main shaft, braking- devices being arranged to cause the disks to stop at the completion of each whipping operation with their slots coincident with insertion slots in the carrier. The warp threads are guided into position below the slots 3<x> by teeth on rings 31<X>, 32<X> on a shaft rotated by ratchet mechanism, wire guides 33x, 34<X> facilitating the entry of the warp threads into the place of the warp and preventing their accidental removal from the teeth, the pitch of which corresponds to the spacing of the whipping-appliances. The warp threads are moved into parallel relation by forks 46<x> on carriers 47<X> on endless travelling bands or chains 48x, the carriers having guide-arms sliding in guides on the frame side. The separated warp threads are engaged by gripping- devices carried by cross-pieces 71<x>, 71<x1>, which are simultaneously moved up and down by cam- and-lever mechanism, each gripping-device comprising three forks 79<x>, 80<x>, 81<x> and a hook 83<x,> which are specially operated to cut and clamp one thread and then engage beneath the other, and then insert both threads a, b into the whipping-appliance, the forks releasing the threads after they have been united. The threads are taken alternately out of the lease by pairs of trough-mouthed suckers 96<x>, Figs. 27 and 31, acting at each side of the lease and formed as tubes pivoted by cock or plug-like pins 103<x> on the lower ends of hollow arms 104<x> provided with eyers 105<x>. An eye 106<x> on the upper end of the arm 104<x> rotates on a hollow pin 107<x> fixed to a suction pipe and provided with a side aperture coinciding with the bore 108<x> of the eye 106<x> when the sucker is in its taking-up position. The bores of the pins 103<x> and eyers 105<x> also coincide when the sucker is in its taking-up position, the current of suction being controlled by the movement of the sucker and the arm 104<x>, which is driven by lever-and-crank mechanism. Each sucker is also moved up and down by a link 115<x> having a pin travelling in a cam-groove 119x provided with a switch 118x. Automaticallyoperated locking-pins 97<x> at the mouths of the suckers engage the taken-up threads and retain them when the suction is cut off. To check the work, the threads are divided into groups. the last threads of which are passed over special rods 120<x>, so as to support levers 121<x>, 122x, under a disk 125<x> provided with a fixed contact projection 126<x> and an adjustable contact projection 126<x1>. At the beginning of the motion of one group of threads, one of the contact projections is situated over the arms 122<x> of the levers 121<x>, 122<x>, the disk being driven forwards by ratchet mechanism step by step, according to the number of threads in a group, until the other contact projection is over the ends of the arms 122<x>. If one of the contactlevers has moved owing to the breakage of the check thread of any group, an electric circuit is completed and an electro-magnet is energized, whereby a weighted lever is released. This lever unolutches the driving-shaft from the driving- motor and clutches it to a fixed cone-clutch. whereby the machine is stopped. For the next group, the disk is driven in the reverse direction until the other contact projection is situated over the arms 121<x>.