Patent GB-189875-A (GB)
Title: Improvements in and relating to warp knitting machines
IPC: D04B27/26
Filed: 1921-09-09
Abstract: 189,875. Patrick, W. Sept. 9, 1921. Warp machines; needles.-Relates to the use of a cam for shogging the warps having a variable working face controlled by a pattern wheel, in conjunction with other improvements applicable to machines for knitting fringed goods such as shawls, scarves, &c. Latch-needles with cranked stems are secured in recessed plates g<4> so as to stand back to back, or there may be one line only of needles. The latches g<2> are controlled by springs g<3> extending down the rear of the needle stems. The needle-bars g, g<1> are mounted on arms 23, 19 and are given a rising and falling movement about pivoted cross-bars 22, 18 by connections 17, 20, 21 worked by an eccentric rod 16. The power shaft b carries the eccentric 15 and also a cam 24 which by means of connections 25, 27 causes the yarn-guide frame f to rock back and forth across the needles. The shogging movement of the frame f is obtained from a cam d on a shaft 28 driven by bevel gear 29 from the shaft b. This cam is formed with a raised face d<1>, Fig. 6, a recessed face d<2> and with a ridge d' the outline of which corresponds to that of the face d<1>. Normally, the lower end of a lever 33, Fig. 2, connected at the upper end with the frame f, is operated by the contours d<1>, d<2> so that the warps after forming loops on one set of needles are guided to form loops on diagonally opposite needles of the other set or on adjacent needles when one set is provided. When it is required to make a fringe the arm 33 is made to work on the ridge d<3> instead of on the contour d<2>. This causes the warps after forming loops on one set of needles to form loops on the needles directly opposite or on the same needles as before when only one set is provided. The ridge d<3> is provided with spring switches d<4>, d<5>, and the switch d<5> is mounted on the pivot of a bell crank 37, Fig. 7. one arm of which is connected to a curved arm 38 held by a spring 40 so as to project beyond the edge of the disc d the switch d<5> being at the same time held out so that the roller 27 on the arm 33 can pass over the cam d<2>. When fringes are to be made a sliding plunger rod 41 is held in the path of the arm 38 by a pattern wheel thereby causing the roller 27 to rise on the switch d<5> and pass over the ridge d<3>. The rod 41 may be actuated by removable contact pieces c<7>, Fig. 9, or by means of a quadrant c<2> slotted so as to slide on the axle of the wheel c and provided with a roller c<3> which is held by a spring c<4> against a snail cam c<1> carrying striking arms c<5> coacting with a fixed stop as the wheel c rotates. The warps are drawn off cops 1 or from beams and pass through a comb 2, over rollers 3, 5, 7, 9, 10 and under rods 4 and 8. The rod 4 is mounted on a bell-crank 42 oscillated by a lever 44 from the connecting- rod 20. Another arm of the bell-crank 42 carries a cross-bar 46 which when raised holds the warps against a bar 6 while the rod 4 draws yarn off the bobbins 1. The rod 8 is held in the bight of the yarns by tensioning springs 8<a>. Fabric takeup mechanism is also described.