Patent GB-413855-A (GB)
Title: Warp tying machine
IPC: D03J1/16
Filed: 1933-06-02
Abstract: 413,855. Uniting warp-threads. FLEISCHER, S. S. C., 8, Pr. Alexandrinesalle, Charlottenlund, near Copenhagen. June 2, 1933, No. 16083. [A Specification was laid open to inspection under Sect. 91 of the Acts, Dec. 4, 1933.] [Class 142 (ii).] A warp-tying machine is provided with means for separating, bringing together, cutting and knotting the end threads of two superposed sheets of warps, means for successively suspending the knotted threads, means stopping the machine on faulty knotting and means for relatively moving the machine and the thread sheets dependently on the movement of the thread separators. The thread engaging members are mounted on a movable carriage 1, Figs. 1<a> and 1<b>, having a frame member 5 that can be moved between movable and stationary warps 6, 7 respectively and carries a driving motor 8 that is operatively connected to two main driving shafts 11, 14, the latter being driven at twice the speed of the former. Separating and approaching mechanism. The end threads of the warp sheets 6, 7 are separated from the main bodies and brought together by the vertical movement of two needles 18, 18<1> which have fork-like extremities for engaging a single thread and are carried by arms 17, 17<1> on shafts 16, 161 adapted to be rocked by the action of cams 115, 115<1> on arms 15, 15<1> respectively. The threads are positioned for engagement by the feelers by pivoted spring actuated members 22, 221 that bear against the end threads until selection is made and are brushed aside by the vertical movement of the needles. As the threads are moved towards each other they engage and rock two pivoted bell crank levers 37, 37<1>, thereby moving hooked arms 39, 39<1> into locking engagement with the feeler supports 17, 17<1>, and finally pass into recesses 30, 30<1> in thread hooks 28, 28<1> which may be formed integrally with stationary or oscillating thread-adjusters 31, 31<1>. The locking of feeler supports prevents further selection being made until the threads have been removed from the hooks 28, 28<1>. If the warps to be united are leased, a modified thread separating mechanism, shown in Fig. 10, may be employed and the feelers shown in Figs. 1<a> and 1<b> used only to move the separated threads to the thread hooks. In this construction a frame 42, Fig. 10, attached to the machine and adapted to slide on lease rods 43, is provided with a shaft 44 that can be rocked and axially displaced by cams 60, 53 on the shaft 11, the shaft 44 being provided with a plate 45 carrying club-headed arms 46 for engaging and drawing back a thread so that it can be caught by a hook 63. The threads are released from the warps in turn by two frame members 50 carried by a sleeve 48 that is slidably but non-rotatably mounted on the shaft 44. The threads separated by this mechanism are fed to the hooks 28, 281, Fig. 1, by the feelers 18, 18<1>, and so long a thread is present in the hook 63, one end of a doublearmed lever 65-66 engages an arm 69 on the shaft 44 and prevents its return for further selection. Inserting and cutting mechanism. The isolated threads are removed from the hooks 28, 281 and presented to a pair of tongs 81, 82 by cam operated tongs 70, 71 on a carriage 73-74 that is only advanced when a pair of threads has been isolated, a knife 79 being provided to cut the threads during its forward stroke. Movement of the carriage 73-74 is dependent on the presence of a pair of threads on the hooks 28, 28<1>, a sliding sleeve 88, reciprocated by a crank on the shaft 11, carrying a catch 93 which, if not displaced by a lever 96, engages a catch 94 on a fixed sleeve 87 and on its return stroke retracts the shaft 74 and the tongs 70, 71. The lever 96 can only displace the catch 93 when rocker arms 37, 371 are in closed position due to the absence of threads from hooks 28, 28<1>, the projections 97 971 thereon preventing movement of lever 96 under pressure by the advancing catch 93 and thereby rocking the catch 93 out of the path of catch 94 on the return stroke. Knotting and suspending mechanism. The tying head comprises a fixed member 101 at the end of shaft 14 and a movable member 102 on a shaft 114 that can be axially displaced twice in quick succession within the shaft 14 by cams 119, 120 on the shaft 11, the threads presented by the tongs 81, 82 being wrapped around the tying head and gripped by opening and closing of the members 101, 102 during two revolutions of the shaft 14. The upward movement of a thread lifter 105, which finally deposits the knotted threads on a string 106, causes the wrapped portion to be drawn over the head to form the knot whilst the ends are held by the beaks. Correcting the relative positions of the warp sheets and the machine. The machine is advanced by the action of the cam operated lever 15<1>, Fig. 1<b>, on a pawl carrying lever 136 which rotates a shaft 133 geared to the wheel carrying shaft 130. If selection of a thread from the top sheet of warps is effected before selection from the bottom sheet the machine is advanced by the pawl 135 until selection can be made. If however the reverse takes place, the advance of the machine is stopped and the upper warp sheet is retracted until a thread is isolated by the continued feeling action of the upper feeler 18, the cam operated lever 15 being provided with a pawl 304 for rotating a ratchet 305 and, by means of worm gearing, a grooved pulley 310 which is encircled by a cord 311 connected at each end to the movable frame of the upper warp. Stop-motion acting on faulty knotting or thread breakage. During normal operation of the machine the knotted threads, on being raised by the arm 105, Fig. 12, engage a pivoted finger 225 and withdraw a depending arm 226 from the path of a lever 233 that is constantly oscillated by a connection 234 from a crank operated link 125. If however the threads are broken or badly knotted the lever 226 is raised by the lever 233 whereupon its supporting lever 216 is rocked to move a projection 217 beneath a member 221 and thereby allow the latter to move under spring action to stop the machine. Actuation of the stopping mechanism is however prevented if no threads are present on the tying mechanism, the shaft 74 in its inoperative position allowing pawls 206, 205, when raised by a cam 211, to slip over a lug 209 whereupon the shaft 201 is rocked by a spring 213 and a lever 230 connected thereto is raised to move the arm 226 out of the path of the lever 233.