Patent GB-699317-A (GB)
Title: Improvements in high capacity mechanical looms
IPC: D03D47/24
Filed: 1951-07-25
Abstract: 699,317. Looms. LICENCIA TALAEMANYOKAT ERTEKESITO VALLALAT, July 25, 1951 [Aug. 1, 1950], No. 17672/51. Classes 142(i), 142(ii) and 142(iii)  A loom comprises a gripper shuttle driven by means arranged along curved sections of a shuttle path outside the shed so as to accelerate the shuttle under centrifugal force, thus enabling it to traverse the shed. The shuttle 51, Fig. 3, is inserted in an inlet tube 55 and pushed into a tunnel 50 which comprises a groove in a carrier wheel 41, an inner belt 46 and an outer belt 45. The carrier wheel and belts are rotated in the direction of arrow 314, the shuttle is pressed against belt 45 by centrifugal force and carried round by it, leaving the tunnel through an inlet tube 52 with sufficient velocity to cross the shed. On leaving the shed the shuttle enters an exit tube 53 whence it enters a tunnel 50 similar to the tunnel on the opposite side of the loom; it is then passed through a second shed before re-entering the first tunnel. Wheels 41 are driven independently of the rest of the loom. Warps. Two warps are disposed vertically on opposite sides of the loom. Warp threads 32, Fig. 2, pass from warp beams 31 by means of carrier rollers 33, tension rollers 34 and carrier rollers 37 to cloth beams 38. The cloth beams and rollers 37 are driven from heddle shafts 72. In one embodiment the warps are disposed horizontally. Beat-up motions, shuttle-races; reeds. The dents of a reed are formed by levers 90, Fig. 7, having arms 91, 92 defining a shuttle-race 93. The reed oscillates for beat-up about a shaft 97 operated by a main shaft 63 provided with an electromagnetic clutch 118 and an electro-magnetic brake 121. While the shuttle traverses the shed a switch 130 is in the position shown by full lines, Fig. 7, brake 121 is active thus keeping the reed stationary and the shuttle-race aligned with tunnels 50. Stop-motions. On leaving a shed and entering an outlet tube 53 the shuttle depresses a key 173, Fig. 8, which brings wings 164 of a weft feeler 155 into contact with the weft. In the absence of a weft thread an abutment 154 is removed from contact with a bar 152 preventing the moving of switch 130 into position for operating the clutch. On breakage of a warp thread a log 141 is removed from the switch-throwing mechanism and switch 130 remains in the inoperative position. The shuttle next depresses a key 148 causing the displacement of switch 130 into its alternative position providing weft is present and warp threads unbroken, clutch 118 being actuated and beat-up motion initiated. When the main shaft 63 has completed a revolution a cam 195 and its associated lever system displaces switch 130 into its inoperative position thereby arresting the motion of the reeds which are again aligned with tunnel 50. The shuttle leaves tunnel 50 through the inlet passage 52, a wall 206 of which is pivoted at 208 and operated from the main shaft 63 to permit the passage of the shuttle only when the shuttle-races 93 are .in alignment with the inlet passages. Thread guiding, cutting. A weft thread 101 is held in a position to be gripped by the shuttle by being passed from a stationary cap through a guide hole 223, Fig. 9, to a bifurcated thread guide 243, the free end of the thread being gripped by a portion 237 of an arm 228 and a finger 234 pivoted to arm 228 and urged by a spring towards the portion 237. Levers 212, 213 form a pair of scissors for cutting the weft. When a weft thread has been laid and beat-up commences, a pin 239 contacts a spring plate 240, opening the space betwen fingers 234 and the portion 237, which then receives the weft thread. Pin 239 rises above the spring plate and the thread is gripped by the finger, the scissors cutting the weft. During the return of the reed pin 239 contacts the opposite side of the spring plate, the weft thread continues to be held and is inserted in thread guide 243 ready for the next pick. Selvages, forming. The ends of the weft extending beyond race 93 are held by the arm 228 and finger 234 at one end, and by the weft feeler 155 at the other end at the commencement of beat-up and are forced between branches 247, 248 of a weft holder 249 at each end of the race. Branch 248 is elongated into a slide bar 252, Fig. 11, guided by a slide bearing 253 and by slots of guide plates 255. The weft roller is reciprocated longitudinally by a roller 263, guided in a lemniscate-like groove of a disc 261 which is rotated by a heddle shaft 72, connected to bar 252 by levers. In the forward position of the weft holder the branches release the weft thread. To remove the thread holder from the path of the scissors a slide 257 suporting the guide bar betwen guide plates 255 is reciprocated by a bell-crank lever, which is actuated by the reed shaft 97. Shedding motions. The heddle shaft 72 operates heald frames 283, Fig. 15, by means of cams 291, 292 keyed to the shaft. Frames 283 are connected to two-part bridles 285. Rollers 286 provided at the ends of the bridles roll between guide plates 287 and are actuated by the cams 291, 292. Dummy shuttles. The gripper shuttle is provided with a transverse slot 295 for receiving a weft thread. The thread is held in the shuttle by an arm 298 of a lever urged to the gripping position by a spring 301. This lever co-operates with a tongue 302 situated in outlet tube 53 to release the weft on the completion of a pick.