Patent GB-191000584-A (GB)
IPC: D03D45/34
Abstract: 584. Crossley, B., Cooper, W. G., and Palatine Automatic Loom Co. Jan. 10. Shuttle-changing mechanism. - In shuttlechanging mechanism in which the shuttle-box front 12 is lowered and the backboard 14 raised to enable a fresh shuttle to be introduced and the spent shuttle to be ejected, these movements are effected by the beating-up of the lay, and the box front and backboard are returned to normal position immediately the lay reaches its foremost position. The front 12 and backboard 14 are carried by two rods 7 and two rods 8 secured to two levers 5 on a shaft 1, which carries a striking-lever 17 provided with a stud carrying a bowl 19. A lateral projection on a part 24 connected adjustably by a screw to a bell-crank lever 23 is raised into the path of the bowl 19 by connexions from the weft-fork mechanism, so that, when the lay beats up, the striking-lever 17 and shaft 1 are rocked, the front 12 being lowered and the backboard raised against the action of a spring 25. The bowl rolls over and slips off the projection on the part 24, when the lay is forward, and the spring returns the parts to normal position The guiding-bosses 9, 10 of the rods 7, 8 are preferably inclined so that the backboard when lifted may be moved back somewhat, and on its return may move the fresh shuttle to the front again, if it should have been pushed a little too far back. When the weft-fork mechanism is actuated, a lateral projection on a slide-block on the weft-fork rod encounters an arm fixed on a cross-shaft 38, which is thereby rocked, and a stud 40 on a lever fixed on the shaft engages in a slot in the, arm 27 of the lever' 23, thus raising the abutment on the part 24 into position to engage the bowl .19. The return movement of the lever 23, under the action of gravity or a spring, is limited by a set-screw on a lug on the bracket 21. A bar 61 adjustably fixed by a screw to a swivel piece 60 on a lever 52 rests upon the part 24, so that, when the latter is raised and the lay beats up, the hooked nose 62 of the part 61 engages a plate 63 fixed to a lay-sword and the lever 52 is rocked. A cross-rod 48 held between the lever 52 and a spring-actuated jaw 53 pivoted on this lever is thus moved, and a block 47 carried thereby is thus reciprocated along two guidespindles, and push-rods 49 then feed a fresh shuttle from the magazine into the shuttle box, the spent shuttle being ejected from the box and being temporarily held against a plate 65 carried by spring-actuated rods 69. When the backboard 14 is lowered, the shuttle is ejected into the shoot 68. The hook-shaped nose 62 is held up by the plate 63 until the lay begins to move backwards, whereupon the plate 63 engages the turned-up end of the bar 61 and returns it nearly to its position of rest, a spring 56 which prevents undue vibration completing the return movement. To guide the fresh shuttle into the box, a frame 70 open to receive the picker is fixed in the shuttle box and has projecting tongs to meet the turned-up back of the magazine, while other prongs 72 formed on the shuttle-box bottom pass between the anglebrackets 43 supporting the magazine. In fastreed looms, the back swell is fixed on the backboard or on one of the supporting-rods, and the back-swell lever, fixed on the stop-rod, is made longer and may be cranked laterally so as to engage the swell while it is lifted. The back edge of the frame or plate 70 is chamfered on its underside, to press the swell back as it is lifted up with the backboard and thus prevent it from catching on the plate 70.