Patent GB-190828326-A (GB)
Title: New or Improved Cut Measuring and Stopping Mechanism for Looms for Weaving.
Filed: 1908-12-29
Granted: 1909-12-09
Abstract: 28,326. British Northrop Loom Co., [Northrop Loom Co.]. Dec. 29. Loom stop-motions. -In a clothmeasuring and loom-stopping mechanism, a threaded shaft 17, Figs. 2 and 6, is driven by bevel and change gearing from the take - up roller 4, or from the lay, or otherwise. A tripping- d e v i c e, comprising two pivotally-connected members 24, 25 threaded to engage the shaft 17 and held in contact therewith by a threaded locking-rod 28 entering a slot in the member 25 and by a nut 29, is moved upwards gradually until, when the required length or ' cut' of cloth has been woven, a lug 31 on the member 24 lifts a detent 41, Fig. 4, and allows a rod 44, with a squared part 43 and a shoulder 42, to be moved by a spring 50 to the right and thereby stop the loom. The completion of the cut may be indicated in the cloth by the usual headers. A handle 47 is used to move the rod 44 behind the detent 41, which falls into locking position when the lug 31, Figs. 2 and 6, is moved. After completion of a cut, the members 24, 25 are separated and moved dowhwards on a guide-rod 22, held in bearings 19, 21, to the starting position, an adjustable collar 33 on the guide-rod 22 limiting the downward movem nt of the tripping-device. A slotted gauge plate 36 is adjustably screwed by an authorized person, such as the overseer, to a har 35 fixed to the brackets 19, 21. The member 25 has a toe 32, which fits over the plate 36 when the tripping- device is in operative position, and thereby prevents the weaver from unlocking the tripping-device until it has travelled to the top of the plate 36. An auxiliary p'ate 40 is used as a further safeguard to prevent the weaver from returning the tripping- device to its starting position before it has travelled the full extent required to give the correct cut. When the tripping-device has moved beyond the plate 40 and has actuated the detent, it is unlocked, and the toe 32 is moved beyond the plate 36. The device may then be moved downwards until it is opposite to a notched part 37 of the plate, and may then be clamped on the shaft 17 in readiness to commence a fresh cut. The loom is preferably stopped by connecting the rod 44 by another rod to a lever loose on the rock-shaft of the warp stopmotion and provided with a finger bent so that, when the rod 44 is moved to the right, this fingar may be moved into the path of the feeler of the warp stop-motion and there by stop the loom in the same manner as a released detector. By noting the position of the handle 47, the weaver may at once determine whether loom-stoppage has been caused by the completion of a cut or by other means. In the warp stop-motion a double-throw feeler is oscillated by means of links from a cam on the cam shaft, and hunters carried by a link are normally held out of the path of tappets on the cam shaft, but, when the oscillation of the feeler is prevented by a fallen detector &c., one of the bunters is left in the path of, and is engaged by, one of the tappets, the link being then moved endways and turning a rock-shaft which operates the knock-off arm and stops the loom.