Patent GB-711511-A (GB)
Title: Improvements in looms
IPC: D03D47/24
Filed: 1951-12-13
Abstract: 711.511. Looms with stationary weft supply. MAREK, A. J. Dec. 13, 1951, No. 29276/51. Class 142(2) In a wire weaving loom, the weft is inserted by a dummy shuttle having grippers at each end operated by a sliding member in the shuttle body, the sliding member being moved when it strikes stops on arrival at the shuttle box. Picking motions. A gear wheel 19, Fig. 1, driven by a gear 18 on the crank shaft carries a striker 23 that strikes a lever 24 pivoted on the loom frame and which depresses a member 25 on the picker stick 26. A spring 27 returns the picker stick. The picker, Fig. 10, has a central portion 93 that slides in a slot in the base of the shuttle box, has an upper portion 94 that strikes the shuttle, and has a lower portion 95 having a hole 98 for a rod 100 of the picking mechanism. During the initial movement of the picker stick, the rod 100 moves a block 101 thereon and a cam portion 105 on the block depresses a lever 107 and raises a rod 110 whose upper end raises a gate member 112 lying across the inner end of the shuttle box. Dummy shuttle. In one embodiment, Fig. 3, the shuttle comprises two superposed parts bolted together and having in each end a slidable member 49. Levers 54 mounted on pins 55 are connected by pins 56 to each member 49. A spring 57 having an over-centre action is connected to the levers. Striking portions 62 are provided on one end of each member 49 and, when engaged by stops in the shuttle box, swing arms 64 pivoted at 63 to cause cams 65 to grip the weft. In a second embodiment, Fig. 27, the cams 65 are mounted on toothed members 236 and pivoted on pins 66. The members 236 engage toothed racks on the ends of rods 49<SP>1</SP>, a spring 241, connected to a member 238 engaging a pin 237 in one bar 49<SP>1</SP>, maintains the cams in the open and closed positions. In a third embodiment, the rods 49<SP>1</SP> are separate members urged together by springs and connected to the cams 65 by links, the ends of the rods striking stops in the shuttle box to operate the cams. The abutting surfaces of the cams may be roughened. Shuttle box. The shuttle box, Figs 7, 15, comprises a base 80 having slots to accommodate the picker, sides 84, and a removable top 130 secured by members 136 connected to a handle 134 and engaging lugs 86 on the sides 84. A block 87 is mounted at the outer end of the box and carries a weft presenting nozzle. Stops 92 for engaging the striking portions 62 of the shuttle are mounted on screwed rods in the block 87. The swell which is spring- loaded, is pivoted in the removable top. The front wall of the box carries a spring- loaded pin 153 which is struck by an adjustable stop on the frame when the slay beats-up and operates the levers 54 in the shuttle. If the shuttle is incorrectly positioned, springs 157, 162 prevent damage to the peg. An incoming shuttle lifts rollers 119 in the box and the gate 112 is lowered behind the shuttle. The box is moved from an inner shuttle receiving position to an outer position where the shuttle strikes the stops 92. At the inner position, a member 49<SP>2</SP>, Fig. 28(m), bears against one end of a finger 251 pivoted at its centre and a roller 253 on the other end of the finger engages a cam surface 254 on the loom frame as the slay swings forward, thereby causing the gripping cams 65 to move slightly to release the weft. Weft supplying, cutting, guiding, and tensioning. Weft from a bobbin 33, Figs.1 and 2, passes over guides 35 and through a feeding device comprising a spring- loaded nozzle 89 mounted in the block 87 in the end of the shuttle box. Cutters 180 mounted on the loom frame are normally held open by a spring but are closed as the slay moves back by a member 184 that engages an upstanding arm on the movable blade. A deflector may be fitted to deflect the cut end. After cutting, the free end of the weft is drawn back to the nozzle 89 by loop-forming mechanism. In one embodiment, this mechanism comprises a two-armed lever 190, 191, Fig. 20, pivoted at 192 and having a grooved roller 195 engaging the weft w. A cam 202 cooperates with the lever 190, 191 which is swung to form a loop in the weft. The weft from the supply passes between two discs 196 pressed together by a strong spring and then passes between two discs 200 held together by a weaker spring. As the loop of weft is formed the weft is drawn back through the discs 200 to the feeding nozzle 89. In a second embodiment, a finger mounted on the slay engages a guide through which the weft passes and, as the slay swings, moves the guide and forms the loop. Selvage. A selvage is formed by spotwelding the severed weft ends to the edge warps. Take-up mechanism. The cloth roll is rotated by a worm wheel 32, worm 31, gears 29, 30 and an eccentrically disposed lever 28 connected to the crank shaft 13.