Patent GB-356761-A (GB)
Title: Improvements in and relating to shuttle changing mechanisms in high speed looms
IPC: D03D43/00
Filed: 1930-03-11
Abstract: 356,761. Looms having automatic weft-replenishing mechanism. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Crompton & Knowles Loom Works; Worcester, Massachusetts, U.S.A.) March 11, 1930, No. 7875. [Class 142 (iii).] In high-speed looms wherein the weft-detecting mechanism is mounted at one side of the loom and the shuttle-changing mechanism at the other side and separate cams are provided for the two mechanisms, the detector mechanism is arranged to transmit immediately indication of weft exhaustion to the other side of the loom where the shuttle-change cam is relatively positioned to delay shuttle change until after the second flight of the shuttle to the changing side of the loom. Means are also provided for assisting the transfer of the shuttle and for disabling the controller of the weft-detecting mechanism during transfer. Weft feeler arrangements.-A weft feeler 33, Fig. 4, of the usual side-swipe type operates; on weft exhaustion to effect, by means of a tail portion 28, a tilting of a controller 37 about its pivot 35 and into the path of a vertically moving actuator 38, Figs. 1 and 5, which is pivoted at 39 to a vertically reciprocating bar 40 mounted on the upper end of a rod 42 associated with cam lever 44 and cam 46 on the bottom shaft 47. On the other end of the actuator is pivoted a rod 48 connected by a bell crank 49 and flexible connections 50, 51 to the shuttle-changing mechanism. Normally the actuator pivots about the joint made with the rod 48 but when the controller 37 engages the opposite end the fulcrum is transferred thereto and the rod 48 is depressed to operate the shuttlechanging mechanism. Shuttle-changing mechanism.-On the replenishing side of the loom a lever 55, Fig. 2, pivoted at 58 and operated by a cam 56 on the low shaft 47, carries a pivotally-mounted latch or lever 64 having a head 67 adapted to protrude through a slot in the lever 55, its action being controlled partly by a spring 66 and partly by connections 51, 50, &c., through its depending arm 69. The forward end of a lever 57, also mounted on the stud 58, is attached to a depending link 60 forming pivotal support for a lifter element 61 associated with the box lifter-rod 59. When indication of weft failure is first transmitted the lever 55 is in the raised position, but when it is lowered, the head 67, which is still acted on by the spring 51 consequent upon the retaining action of the cam 48, is pulled beneath the lever 57 so that upon the next upward movement of the lever 55 by the cam 56 the lever 57 and consequently the boxes are raised for replenishing action. When the boxes are raised abutments 74 thereon engage and push back adjustable screws 73 on a movable shelf 72 of the magazine M, thereby allowing the bottom shuttle to take its place in the top shuttle box, the same movement of the lay causing a flap door 77 of the box to be raised by the engagement of a roller 80 with a cam 81. The feeler mechanism is prevented from indicating a fresh change before transfer is effected by means of a member .110, Fig. 1, which on the upward movement of the lever 57, with which it is associated, allows a spring-controlled member 86 to move in a clockwise direction, thereby, through members 88, 90 and 91 operating a member 93, Fig. 5, to keep the controller: 37 or part thereof out of the path of the actuator 38.