Patent GB-190900005-A (GB)
Title: New or Improved Pick Matching Mechanism for any Number of Harnesses in Automatic Weft-replenishing Looms.
IPC: D03D45/20
Filed: 1909-01-01
Granted: 1909-11-25
Abstract: 5. British Northrop Loom Co., [Northrop Loom Co.]. Jan. 1. Shuttles, changing bobbins and the like in, automatically; weft, cutting.-In looms provided with any number of healds and with weftreplenishing mechanism actuated by either of two independent weft forks A, B, Figs. 21 and 22, at the supply and opposite sides of the loom respectively, the replenishing-mechanism is so timed and the shedding governed in such a manner by a differential governor N, Fig. 1, on the low shaft G, that the first pick of fresh weft is introduced into the same shed, and preferably from the same side, as the broken weft. Both weft forks, by means of corresponding slides and fingers, operate the starting-shaft T, whereupon the replenishing and shedding mechanisms are brought under the control of the governor until a predetermined subsequent pick independently of the action of the weft forks during these intervening picks, the governor exerting a differential action, as shown respectively in Figs. 21 and 22, according to whether the weft fork A or B first detects failure. Shedding-mechanism such as is described in Specification 15,426/04 mav.be employed, four healds only being assumed to be in action, though five are shown in certain of the Figures, and in normal weaving the healds are assumed to be lowered singly in numerical sequence. The healds are actuated by camlevers b, Fig. 7, which have coupler-bars c, d moved into engagement with a vertically-reciprocating actuator F by spring-actuated followers o, while selector cams I, Figs. 1 and 7, on an intermittently-rotated shaft g disengage the coupler-bars as required. The shaft g is driven by bevel-gearing from a shaft i, which is connected by a spring-actuated clutch J to a shaft j driven by a cam on the crank-shaft H. A lever P is provided with a runner O, the upper end of which is pressed towards the shaft G by a torsion spring, a latch S bearing against the lower end of the runner O and normally preventing movement thereof. When the starting-shaft. T is actuated, the latch S is operated by lever mechanism v, u so as to free the runner O. If the weft fork B, Fig. 22, has been actuated, the shaft G, Fig. 1, is in such a position that the runner O passes, by means of an entrance not shown in Fig. 1, into cam-paths 26, 27, whereby the lever P is rocked against the action of a spring 34, and its upper end acts upon the upper cam-surface of a clutch lever Q, which raises the clutch J and uncouples the shafts i, j. The normal sequence of shed formation is thus stopped, the healds 1, 4, Fig. 22, which have their coupler-bars coupled to the actuator, continuing to move up and down until after the third pick, when the runner O, Fig. 1, has left the governor N by means of an outlet, not shown in Fig. 1, and the shafts i, j are again clutched together, after which the normal sequence of shed formation is resumed. The second pick is an idle one, no weft being laid in the shed. Before the third pick, fresh weft is supplied to the shuttle and is laid in the same shed and in the same direction as the broken weft. If the weft fork A, Fig. 21, is first operated, the shaft G is in a different position and the runner O is directed through the entrance 21 into a cam-path 23, whereby the lever P is rocked and arrests the normal sequence of shed formation as above described. The runner O afterwards passes into a cam-path 24 nearer to the shaft G, whereby the lever P is rocked further and a cam R, Figs. 1 and 7, thereon actuates a roller r and rocks an uncoupling- lever M. The followers m are provided with tumbler-levers L, by which they may be disengaged from the coupler-bars independently of the selector-cams. The heald 1, Fig. 21, that has last been brought into action, has its tumblerlever foot p opposite"a low part of the selector cam, so that the tumbler-lever falls into the path of the uncoupling-lever, and the couplerbars of this heald are uncoupled from the actuator, which however remains coupled to the coupler-bars of the heald 4, since the tumblerfoot thereof is on a high part of the selector - cam, and the tumbler is raised out of the path of the uncoupling - lever. After the third pick, the heald 1 therefore remains up, and, the heald 4 having been moved up, the fresh weft just supplied to the shuttle is thrown under all the warp threads and is cut at the right-hand selvedge as described below. At the fifth pick, this weft is drawn into the same shed as that wherein weftfailure occurs. The runner O, Fig. 1, is then directed into an outlet and the normal sequence of shed formation is resumed. The transferrer spring-actuated dog D has a lateral lug or pin, which engages a slotted lever W on a shaft carrying the usual shuttle-feeler X, the lever W being connected to a rod V fitting through the perforation in a lug or arm z secured to the lever P. The rod V has a shoulder 30, which prevents movement of the lever W tb raise the dog D under, the action of a torsion spring, until the lever P is liberated from the latch. To prevent the actuation of the weft-replenishing mechanism while the shuttle is in the. left shuttle box, the cam for the right-hand wefthammer is so timed that a lateral pin on this weft-hammer may engage the shuttle-feeler and prevent the shaft W from rocking sufficiently to place the transferrer dog into the path of the lay bunter, until after the shuttle has been thrown into the left-hand shuttle box and the lay bunter has passed the dog-engaging point on the beat-up. The thread is cut by a movable blade Z, Fig. 9, pivoted to a stationary blade Y, which is supported by the stand or guide of the weft-fork slide x at the supply side, the blade Z being kept in cutting contact with the stationary blade by a spring washer 41. The tail of the blade Z is connected by 'a spring 42 to the slide x, so that the thread-cutter is opened when the right-hand weft fork A is actuated. On the beat-up, the lay strikes the heel 43 of the movable blade and closes the thread-cutter, which cuts the loose thread at the right-hand selvedge, the thread being guided by a guide 44. To hold the selector-cams' accurately in place when unclutched from the driving-shaft, the clutch J, Fig. 1, has a flange provided with notches, one of which engages a fixed stud when the clutch J is lifted. The healds may be arranged to couple with the actuator F, so that on the idle pick the shuttle passes over all the warp threads. The shed governor may be employed in a loom wherein the shuttle does not at times pass below or above all the warp, or wherein its delaying action only is utilized. Instead of continuiug the reciprocation of the heald 4, Fig. 21, this heald may be uncoupled by the lever M at the same time as the heald 1 by suitably arranging the position of the foot of the corresponding tumbler, the fresh weft being inserted at pick 4 in a different direction to the broken weft.