Patent GB-191101063-A (GB)
Title: Improvements in or in connection with Loom Stopping Mechanism.
Inventor: JACKSON SIMEON SCHOON
IPC: D03D51/00
Filed: 1909-12-20
Granted: 1911-03-20
Abstract: 1063.. Jackson, S. S. Dec. 20, 1909. Weft-replenishing mechanism.-After weftfailure has been detected by the weft-fork mechanism at either side of the loom, the weaving - mechanism is stopped with the shuttle always on the same side of the loom, and after a certain number of picks have occurred subsequent to the broken pick, this number varying according to the direction of the broken pick and being such that the first pick of fresh weft, on restarting the loom, is thrown through a reopening of the shed in which the weft - failure occurred. The invention is described in connexion with a loom wherein the shedding cycle comprises three harness changes, and wherein, after the usually operative parts of the loom have been stopped, a normally stationary change-shaft is rotated, this shaft causing shuttle - changing to occur and then automatically restarting the loom. Devices for preventing the weft-fork mechanism from being operated during the first beat-up on restarting the loom, and. for preventing the changeshaft from being operated accidentally, are also described. When th weft fails on a pick (p i c 1) to the replenishing side of the loom, the weft-fork slide 31, Figs. 3, 5, and 6, at that side is operated, the weft-fork-hammer cam being specially shaped so as first to advance the hammer 34 sufficiently to engage its weft-fork 30, and the hammer then dwelling and finally completing its forward movement immediately after the return pick (pick 3) to the replenishing side of the loom. The slide 31 is adjustably connected to an arm 36 on a shaft 37, a second arm 38 fixed to this shaft being provided with a stud 392, on which is pivoted a dog 39 having a lateral engaging projection 391. When the slide 31 makes its final movement, the projection 391 engages a shoulder 42 on and operates an arm 41 fixed to a short rod 411, which causes the loom to stop and the shuttle to be changed, as described below, the first pick when the loom restarts (pick 4) being introduced into a reopening of the shed containing the broken pick. When the weft-fork 50 at the driving side first indicates weft-failure, the corresponding weftfork slide 51 is moved forwards, and, by means of adjustable connexions 56, 57, an arm 58 loose on the rod 37 and provided with an inclined cam portion 59 is moved, the cam portion acting on a pin 393 on the dog 39 and lifting its engaging projection above the shoulder 42 of the arm 41, so that, when the weft-fork 30 is first actuated and the dog 39 is moved forwards; its projection 391 does not operate the arm 41. A wire 62 fitted in a socket in an arm 60 hung upon the stud 392 of the dog 39 is moved forwards, so that its upwardly-bent portion 64 acts upon a lateral projection 65 of the weftfork 50, tilts the weft-fork on its return with the slide, and prevents actuation of the weftfork 50 at the third pick, so that the weft-fork slide and its engaging cam remain in their rearward position, and, when the weft-fork 30 is again actuated (pick 4), the dog 39 is moved far enough forwards to cause the projection 391 to engage the shoulder 42, and the wire 62 is moved far enough forwards to prevent the actuation of the weft-fork 50 at pick 5. The weft hammer 34 then completes its movement, and the rod 411 is turned immediately after the sixth pick, to cause stoppage and weft-replenishment, the first pick of the fresh weft (pick 7) being again introduced into a reopening of the shed containing the broken pick. When the short rod 411 is turned, a projection on a hub thereon engages a projection on the shipper handle 20, Figs. 5 and 7, and rocks the shipper shaft 21, a rod 19 pivoted to the handle 20 being moved from one side of the shaft 21 to the other, whereupon a spring comes into action to operate lever mechanism, which causes a continuously-rotating hand-driven loose pulley to be unclutched from a wheel fast to the crankshaft, and also causes a band-brake to be tightened, whereby the usually operative parts of the loom are temporarily stopped. The lever mechanism may be operated by a hand-lever to stop and start the loom. When the rod 411 is turned as described, an arm 43 thereon raises a latch by means of a connexion 44 and thus operates clutch mechanism, as described in Specification 30,335/09, whereby a changeshaft 25, Fig. 3, is driven from the loose band pulley. Cams on this shaft actuate the shuttlechanging mechanism described below, and, after the shaft has made a complete revolution, the clutch through which it is driven is automatically disengaged to stop its rotation, a cam 29 on the shaft having first operated an arm or lever 291, which engages an adjustable collar on a rod 293 pivoted to an arm 295 connected by a spring to an arm 296 fast to the shipper shaft 21, Figs. 3 and 7, whereby the usually operative parts of the loom are restarted, the changeshaft being locked against accidental rotation by the engagement of a projection on the lever 291 with a recess a in the cam 29. To prevent immediate actuation of the stopping-mechanism during the first beat-up on restarting the loom, a lever pivoted on the lay-sword pin is broadened at its free end to extend across or bridge one or more spaces of the grate cooperating with the weft-fork 30, and is actuated through lever mechanism by a cam on the change-shaft so as to be in position on the first beat-up, but not subsequently, to act just as a substitute weft to tilt the weft-fork 30. In order to prevent accidental actuation of the change-shaft after the loom has been stopped and the shipper handle is in the stopping position, when, for example, working the loom by hand, a finger 396 is fixed to the shipper shaft 21 and has a transversely-broadened extremity, which engages a tail 395 of the dog 39 when the shipper shaft is turned to stop the loom, and tilts the dog upwards so that it cannot engage the shoulder 42. If the weaver, in turning the loom by hand, should then cause the weft-fork mechanism to be operated, the dog 39 makes an idle stroke and does not actuate the changeshaft, so that accidents are prevented. Shuttle-changing mechanism.-An edge cam 269 on the shaft 25 operates lever mechanism 267, 266, 265, and arms 261 carrying the vertically - movable front plate of the movable shuttle box are thereby raised, a finger 274 which projects forwards from an ejector 27 mounted on brackets 271 at the back of the shuttle box being actuated by one of the arms 261 to eject the spent shuttle on to a flexible apron connected to the lay and passing over a transverse rod 281 at the rear of a shuttle receptacle. A spiral spring 272, connected to a strap wrapped round the ejector rock-shaft and secured to a rock-shaft 262, retracts the ejector, the movement of which is limited by a finger 273. A cam 243 on the change-shaft causes a preliminary movement of an injector 24 towards the front of the loom, thereby operating a downwardly-extending finger 232 of a shuttle support 23 having rearwardly-extending fingers, which are thereby withdrawn so that the contents of the hopper drop until the bottom shuttle rests upon the horizontal portions of the injector. The injector then moves towards the lay under the action of a spring 244, and feeds a fresh shuttle into the shuttle box, the shuttle support 23 swinging rearwards to support the remaining shuttles in the hopper.