Patent GB-653386-A (GB)
Title: Improvements in or relating to apparatus for mounting warp-stop detectors in looms
IPC: D03D51/20
Filed: 1947-05-02
Abstract: 653,386. Mounting warp stop motion detectors in looms. ZELLWEGER AKT.- GES. APPARATEUND MASCHINENFABRIKEN USTER. May 2, 1947 No. 11836. Convention date, May 3, 1946. [Class 142(ii)] Detectors 147, Fig. 3, having a closed upper slot and an open-ended lower slot, are mounted astride the warp threads in a loom by mechanism which separates successive warp threads from a lease and separates detectors from a number of stacks in turn, the machine traversing across the warp along rails 3 mounted on the loom framework. Separating warp threads. Figs. 3, 13. A separator comprising a pusher 61 and a sickle 52 operating between lease rods 5 engages the next warp thread d (the pusher being at this time retracted within the e sickl); the pusher then moves the thread away from the main part w of the warp, whereupon blades 128, 130 drop (side-by-side), between the separated thread and the warp and then open (scissorwise); a finger 68, which has meanwhile been lying horizontally above the warp near the lease rods 5, then turns vertically downwards between the thread d and the warp w and swings to the position shown, thereby completing the separation of f the e thread throughout its length, whereupon a blade 108 drops between the thread d and the warp w. The thread next receives a detector (as described below) after which the pusher 61 and the blade 108 push it up to the already treated threads t, a blade 92 rising to permit this and then dropping alongside the blade 108. Feeding detectors, Fig. 10. Each stack of detectors 147 slides down a rib 146, the foremost detector resting against a lug 146<1> and against a separator device 145 described in Specification 594,423. When the device 145 separates the first detector from the stack, gripper arms 107, 116 take hold of it by the ends of its closed slot, lift it over the lug 146<1>, and insert it between feed rollers 76; these force it over a spreader 149 which splays out its legs and deposits it on the separated thread and on a guide bar 4 across which the thread is disposed, see Figs. 3 and 13. The separators 145 and gripper arms 107, 116 for the various stacks of detectors are controlled by cams so as to take a detector from each stack in turn. Stop motion. If a detector is not delivered the machine stops. As shown in Fig. 15, the upper gripper arm 107, in lifting a detector over the lug 146<1>, also lifts the gripper arm 116 (the detector 147 acting as a link between them), to bring an arm 117 into the path of a bell crank lever 123, thereby preventing the stop motion from acting. If, however, no detector is present in the grippers, the bell crank lever is free to turn under the influence of a spring 124 when a recess in a cam 98 reaches the position shown. A link 126 thereby turns a fourarmed lever 38, releasing a spring-loaded lever 26 which is coupled to the motor switch and also, through linkage 29, 31, to a clutch 17, 18; the clutch is disengaged and a brake cone 20 simultaneously engaged with a brake drum 21. A handle 35 is provided for stopping the machine manually.