Patent GB-171124-A (GB)
Title: Improvements in and applicable to twist lace machines and to fabrics produced thereby
IPC: D04C5/04
Filed: 1920-05-14
Abstract: 171,124. Stroud, A. E. May 14, 1920. Lace; lace machines.-Relates to improvements in twist-lace machines and in woven or other fabrics produced thereon from warp and bobbin threads c, d, Fig. 10, and weft threads a, b. The threads c, d may be twisted together as shown in Fig. 11, the weft thread a being laid in the twisted pillars. The wefts, which may be individual threads or groups of threads, are traversed by carriers 43, 44 which may be mounted as shown in sliding traversing blocks 45 or may be pivoted on the comb bars. The blocks 45 or pivoted carriers are traversed to lay the wefts by wires or rods 46 which are carried by blocks 47, Fig. 4, traversing in horizontal grooves of a double channelled member 48 mounted on a framing 49 situated at one end of the machine. The traversing movement is imparted by a cam 55, 56 having a cam-groove 55<a> which operates sliding members 59, 61 connected by means of counterpoised levers 64, 67, adjustable links 71, levers 68, 69 mounted on a common pivot 70, links 73, slides 74, and spring catches 76 to the blocks 47. These catches are mounted on the blocks 47 and are normally in engagement with projections 75 on the slides 74 but can be tripped by rollers 78 on levers 79 to prevent the blocks 46 from being continuously traversed. The rollers 78 are lowered into the paths of the catches 76 by means of adjustable members 84 mounted on the rims 83 of two intermittently rotated wheels 81. The wheels 81 are mounted on a shaft 85 carrying a ratchet 95, Fig. 6, which is driven round by adjustable pegs 94 placed in the face of a ratchet 92. This ratchet is operated by a claw arm 91 on a radius arm 89, which is adjustably connected by an oblique link 88 to an eccentric 87. The take-up roller 102, Fig. 4, is driven from an eccentric 111 by an oblique link 110, radius arm 108, claw arm 106, ratchet 107 and worm and worm-wheel 104, 103. The shaft 105 on which the ratchet 107 is mounted can be independently actuated by means of another ratchet 118, Fig. 6, driven from an arm 112 on an oscillating shaft 20 by the link 113, arm 114, and claw arm 116, and these two motions can be used conjointly for varying the speed of the shaft 105, and the speed at which the work is taken up, the distance apart of the wefts in the fabric being also-varied accordingly. For reducing the speed of take-up just before and just after the carriers cease and begin to traverse so that the fabric when cut into lengths will be stouter or heavier at the extremities, the ratchet 95 is provided with adjustable pegs 156 which engage an arm 157 mounted on a shaft 158 and forming part of a frame 159, 161, 162 by means of which a claw arm 160 can be held out of engagement with the ratchet 118, after which the shaft 105 is driven at a slower rate by the ratchet 107. This mechanism replaces the driving gear 116, 114 &c. of Fig. 6 and is particularly applicable when onlv one row of weft carriers are employed. The wefts are tensioned by being passed under rollers 141, Fig. 3, carried on pivoted arms 144, the tension being supplied by hanging weights 146. The wefts also lead through spring arms 143 which take up slack and impart tension. The steel bars 38 for the warps can be shogged by means of a lever 150, Fig. 4, with a roller 152 running on a cam 153. The catch bar 4 and landing bars 5 are attached to links 22 pivoted to a frame 21 on a shaft 20 which is oscillated by link work arranged to give extra time for the laying of the weft threads. Specification 137,774 is referred to.