Patent GB-334812-A (GB)
IPC: D03D45/34
Filed: 1929-12-20
Abstract: 334,812. Schmidt, P. March 27, 1929, [Convention date]. Shuttle-changing mechanism. - In shuttlechanging mechanism for overpick or underpick looms wherein the full shuttle is introduced on one side of the loom and, at the same time, the empty shuttle is ejected on the other side, the front walls of the shuttle box are moved upwardly and forwardly at an inclination to the vertical by a member to which rotary motion is imparted by the crankshaft and then descend abruptly in two successive stages. Shuttle-change initiating arrangements. Upon failure or breakage of weft, the weft,fork arm 3, Fig. 4, moves the upper arm 4 of a bell-crank lever to the left and through a link 5 and an arm n rotates a control shaft 6 into position to be held by a detent 7<1> in the path of the lay in engagement with a locking-member 7 on the shaft. The shaft 6 on being turned, moves a bowl 8 into the path of abrupt cams h, i on the crankshaft whereby a shaft 13<a> is rotated through lever mechanism 11, 12, 13 against the action of a spring d Shuttle-box arrangements. When the shaft 13a is rotated as described above, links 14 connected to the front walls 15 of the shuttle boxes move the latter upwardly and forwardly as shown in Fig. 4, the outer rod 14 for each shuttle box being guided in a spring-controlled lever device whereby shuttles of different widths may be employed. Picker-positioning device. An arm 13<c>, Fig. 4, on the shaft 13a is adapted, on call for weft replenishment, to be raised and to move a rod upwardly wherbey a rod 18 is turned to move the picker outwardly and clear of the fresh shuttle. Shuttle-magazine arrangements. When the weft-fork arm 3, Fig. 4, is operated, the upper arm of the lever 4 moves to the left, so that fingers 32 on levers 31 pivoted to an arm 29 on the lever 4 are raised and lift the shuttles in the magazine free from the lowermost shuttle 16. At the same time, fingers 33 normally holding the lowermost shuttle in position are raised to allow that shuttle to be fed into the shuttle-box. The fingers 32, 33 are held raised by a detent device 34, 35, Fig. 8 (not shown), which is released on the return of the shuttle feeder or slide 27. Shuttle - feeding arrangements. When the control shaft 6 is turned, a lever 22 is moved into the path of a yielding abutment 24 on the lay by link and lever devices, so that a shuttle feeder or slide 27 is moved to transfer the lowermost shuttle beneath the raised front 15 of the shuttle-box. The front 15 falls abruptly about half-way and, as the feeder returns, it falls again abruptly to its lowest position. Shuttle-rejecting arrangements. When the shaft 13a, Fig. 9, is rotated, upon call for shuttle changing, an arm 13b carrying rods 14 for raising the front 15 of the shuttle-box at the shuttleejecting side of the loom, moves a cam 45 on a rod 44 mounted in yielding guides to engage levers 46 to move pins 47 through the swell 48 to eject the shuttle, cam and lever devices, Figs. 13 and 14 (not shown) controlled by the ccntrol shaft and operated by the movement of the lay being provided for moving the swell outwardly. Weft, cutting.-At the beginning of the shuttlechanging operation, a cutting-device 40, Fig. 10, is raised by mechanism operated from the crankshaft and set in operation by the weft-fork mechanism, and held in position by a spring- controlled arm 70 engaging a notch k in its lower part. After the first weft a has been inserted, a projection 71 on the weft fork hammer 42 engages a cam 72 on the lever 70 to release the cutter 40 to cut the weft. Preventing premature operation of the weftfork mechanism after shuttle changing. The weft cutter 40, Fig. 10, carries a stop member 84 extending behind the lay and adapted to extend into the path of the weft-fork when the fresh shuttle has been introduced and the welt thread from it has not yet been introduced into the shed. Take-up motions.-The control shaft 6, Fig. 15, which is rotated through the weft-fork mechanism upon call for shuttle change, raises the pawl 58 of the take-up motion wheel 59 through the link and lever mechanism shown. Jacquards, dobbies.-The control shaft 6, Fig. 15, which is rotated through the weft-fork mechanism upon call for shuttle change, causes the reverse rotation of the jacquard or dobby cylinder 90 to be effected by the devices shown.