Patent GB-190228740-A (GB)
Title: Improvements in Looms for Weaving Leno and the like Fabrics.
Filed: 1902-12-30
Granted: 1903-12-30
Abstract: 28,740. Heyworth, E., and Smith & Bros., W. Dec. 30. Loom change-box motions; picking-motions; shedding-motions; jacquards.-In looms for weaving leno, madras, and like fabrics, change - box, picking, and warpcrossing tappets are dispensed with, and designs in any number of colours can be woven without changing the working parts. Any drop-box motion, but preferably that described in Specification No. 12,689, A.D. 1898, may be employed to operate the shuttle boxes, such motion being driven from the crank shaft e, Fig. 2, through elliptical gearing f, which gives a longer time for the action of the parts controlling the dropbox mechanism, thereby obviating the changing of the dropbox motion parts in altering the loom from check to pick-and-pick weaving. The gauzereed rod g is actuated by a treadle h, which is worked by a rod i and gearing k from the shaft e. The picking-shafts l are mounted on the lay, and carry pins o, and vertical shafts m carrying pins n are oscillated to bring the pins n alternately into the path of the pins on the picking-shafts, which, on the forward movement of the lay, are thus operated alternately. Snugs m<2> on the bearings of the shafts m hold the pins n steady in operative position. The shafts m, Fig. 6, carry arms q which are oscillated directly and through a cord q<1>, respectively, by a pivoted elbow-lever p operated by a cord r from any uf the jacquard books or from the drop-box motion or otherwise. When operated from the drop-box motion, the lever q carries a bowl which is acted upon by a cam t on a shaft s. A ratchet-wheel u at the back of the cam is engaged by a pawl y carried by an arm x freely mouuted on the boss of the cam, and a lever z, pivoted to the arm x and steadied during working by a weight 2 or a spring or both, is operated from the needle lever of the drop-box motion so as to bring a lug 3 into engagement with a stud 4, Fig. 2, on the lever h, whereby the lever z is lifted to turn the cam. A spring bolt w engages pins v projecting from the wheel u to hold the cam when at rest. In another arrangement, the lever z may be operated or controlled from a stud on the shuttle-box rod, or may be retained in working position, as the pattern requires, by a plate 7 secured to an elbow-lever 8 and adjustable by hand. The elbow-lever 8 is pivoted to the shaft s, and carries on one arm a hinged lever 10, the ends of which form guides for a single-lift jacquard rod and the gauze-reed rod g. Each time the shuttle-box lever 16 rises, a plate 11<x> secured at the fulcrum end of the shuttle-box rod 6, which is pivoted to the lever 16, acts on a weighted hoop 8<x> on a rod 11 secured to the free arm of the lever 8, and tilts it so as to disengage the jacquard rod from, and engage the rod g with, the stud 4 on the treadle lever h. In this position of the lever 16, the stud on the shuttle-box rod acts through a rod 7<x> to engage the lug 3 of the lever z with the stud 4. One of the pins n is thus brought into working position, in which position it is left for one or more picks as the pattern requires. The warp-crossing reed c is operated by a cord c<1>, Fig. 6, from a lever 14 mounted on the pivot of the leverp and operdted by the cam. The rod 6 connects the shuttle-box lever 16 to an elbow-lever pivoted on the lay sword at one side of the loom, such elbow-lever being connected by an adjustable rod with another elbowlever which is mounted on the opposite lay sword and linked to the shuttle-box rod at that side. A single or double lift jacquard is employed for working the harness, and the disengagement of the jacquard rod from the stud 4 may be effected by means of a blank card 21, Fig. 7, which is suspended from a pivoted lever 22 connected through a cord 23 and pivoted lever 23<x> with certain hooks 40 of the jacquard. When weaving plain, or in forming the gauze shed, the hooks 40 are pressed off their griffes 25 by the pattern cylinder 26 pressing the card 21 against the needles 27. A lever 28, pivoted to a fixed bracket 29 and operated by a spring 22<x> and cord 21<x> from the cord 23, is brought in front of one or other of two hooks 24<x> when the card 21 is raised, and keeps this hook clear of the griffe 25x while the other one is free to be moved into engagement with it by the needles 27<x>. Levers 30, 31, respectively loose and fixed on a shaft, are connected by a spring 32 in compression. On movement of the lever 30, the cylinder 26 is brought against the needles 27x, and the spring 32 acts as a cushion, causing a dwell to allow the drop-box needle levers F, Fig. 2, to come into action and operate the boxes. The lever 30 is connected to the griffe lever F<1> by a rod 35, which is locked to a slotted bracket 35<x>, pivoted to the lever F<1>, by a pivoted lever 37 and stop 38. The movement of the lever 30 raises the griffe 25x and lifts one or both of the hooks 24<x>, which are connected, through bell-crank levers 36 and cords F', with the drop-box motion needle levers F. Cords 33, 34, operated by the jacquard or by the weaver, are arranged to withdraw the lever 37 away from the bracket 35<X> when required, the bracket then sliding on its pivot without operating the griffe lever F<1>, and thus rendering the shuttle boxes inoperative. The catch 43 for turning the cylinder 26 is lifted out of engagement with the cylinder during plain weaving by a cord 42 connected to the lever 22.