Patent GB-174508-A (GB)
Title: Improvements in or relating to jacquard-machines or dobbies with a needle board which is movable in divisions
IPC: D03C3/24
Filed: 1920-12-02
Abstract: 174,508. Soeters, M. C. Dec. 2, 1920. Jacquards ; dobbies.-A jacquard or dobby has a needle-board 1<A> made in sections, so that some groups of needles 1 can be placed opposite the lower and others opposite the upper row of holes in the sides of an iron needle-controlling cylinder 25 or in perforated cards on a perforated wooden cylinder, one row of holes in each card being arranged to weave, for example, a warp-satin effect and the other a weft-satin effect. The needle-board sections are carried by slotted rods 2 controlled by springs 5<2> and operated by spring- controlled pattern-levers 6, which are controlled by notched pattern lags or cards or by lags &c. 12 provided with displaceable pegs 9, one undivided pattern lag &c. serving to operate all the levers 6 at one time. The cylinder 25 may have five sides, as shown, and, after five picks, during which these sides have come into action in succession, the cylinder 11 carrying the pattern lags &c. may be turned in either direction to bring a fresh lag beneath the pattern levers 6, thus causing fresh groups of the needles 1 to be moved to lower and upper positions. An auxiliary set of pattern lags &c. 38 determines whether the cylinder 11 is rotated backwards or forwards or is allowed to remain in the same position after the five picks by acting on spring-controlled feelers 27, 28, which are normally held in a raised and inoperative position by means of one end of a transverse lever 26. After the five picks, the other end of the transverse lever is raised by means of a frame 14 operated from a jacquard hook &c. controlled through a special needle and a special hole in one of the jacquard cards. The feelers are thus released, and are drawn down on to the auxiliary pattern lags &c. 38, and, according to the pegging thereon, either the feeler 27 depresses a push-pawl 29 into engagement with a ratchet-wheel 39 on the shaft 40 of the cylinder 11, which is thereupon turned forwards or the feeler 28 depresses a push-pawl 30 into engagement with a ratchet-wheel 43, in which case this wheel 43 is turned, and, by means of gearing 44, 45, the shaft 40 and cylinder 11 are turned backwards; or pegs on the lags may prevent either feeler from being depressed, so that neither of the pawls 29, 30 comes into action and the shaft 40 and cylinder 11 are not rotated in either direction. The pawls 29, 30 are normally moved into inoperative positions by springs 47, 48, which, however, are weaker than the springs 36 controlling the .feelers 27, 28, and the pawls are pivoted at 46 on a lever 50 provided with a slidable block 52 acted on by a spring 53 and having a projection operated by the radius link 54 carrying the jacquard cylinder &c. 25. The lifter frame 14 lifts all the levers 6 and also a special lever 13, shown in Fig. 7, away from the cylinder 11, when this is turning, wear being thus prevented. The cylinder 94 carrying the auxiliary pattern lags &c. 38 is rotated from the cylinder 25 through a clutch and pin and pinwheel devices controlled by the special lever 13, which is itself controlled by the pattern lags 9, the parts being so arranged that after each five picks the cylinder 94 is or is not rotated according to the indication given by the pattern lags. The cylinders 25, 11 are provided with spring-presser devices to prevent overrunning, and a shaft 63 from which the cylinder 94 is driven is provided with a ratchet-wheel 67 engaged by a spring- controlled pawl on a spring-controlled lever 86, which is at times acted upon bv a pin 92 on a crank on the shaft 60 of the radius link 54, this pawl acting to prevent overrunning of the shaft 63 whilst allowing the shaft to rotate at times in a reverse direction. The cylinder 25 is intermittently rotated by means of a pawl 55, and it can be driven reversely bv a counter-pawl device 65 operated by a cord 66. The cylinder 25 may have more or less than five sides, other parts of the apparatus being correspondingly modified. A double ratchet-lever for moving the cylinder 11 backwards or forwards in case of a fault is provided on the elongated axis of the cylinder. The upward movement of the needle-board divisions is limited by the upper cross-bar, and the downward movement is limited by the lower cross-bar, of a guide-frame 4, and the slots in the rods 2 are of such a length that when the levers 6 are lifted by the frame 14 during the turning of the cylinder 11 the left-hand ends of these levers do not touch the upper ends of the slots in the rod 2, so that there is thus no connection between the lags &c. 12 and the needle-boards during the rotation of the cylinder 11. A similar action occurs when a peg raises a lever 6, and when there is no pattern peg underneath such lever the right-hand end of thislever 6 is depressed by its spring and the other end of the lever raises the corresponding rod 2 until the corresponding needle-board division engages the upper cross-bar of the frame 4, the springs controlling the levers 6 being stronger than the springs controlling the slotted rods 2.