Patent GB-190318650-A (GB)
Title: The Construction of Sheets or Nets made of Helically Twisted Wire with a Selvedge or Edging to the same, and the Machinery connected therewith.
Inventor: GIUSSANI GIOVANNI
Filed: 1903-08-29
Granted: 1904-08-11
Abstract: 18,650. Giussani, G., Crisp, S. S., and Grice, H. Aug. 29. Wire fabrics are woven with warps and wefts of helically-twisted wire, and a selvage is formed at each edge. In the Provisional Specification it is stated that the fabrics are intended for use in the fireproof construction of walls, ceilings, &c. Looms, general arrangement of; back-bearers; driving - mechanism. - In looms for weaving the above fabrics, the warp wires are drawn from drums b, and pass downwards over guide-rollers b<1> into a lower plane to the shedding-mechanism. A shaft l mounted in the upper part of the framework in the first-motion shaft, and the various mechanisms are driven therefrom. Loom shedding-motions. -The warp wires, instead of, or in addition to, passing through loops in the healds c, c', pass alternately through tubes c<2>, c<3> hinged to the healds c, c' respectively. The tubes are guided by combs c', c<5>, the former carried by a bar c<6> hinged to the heald c, and the latter by a counterweighted bar c<7> pivoted to the framework. The healds are operated by rods hinged to opposite ends of a lever on a rock-shaft t, which is rocked in the following manner :-A lever r, centered on the shaft of the cloth beam h, is vibrated by a rod l<6> from a crank-pin on a spur-wheel l<1> on the shaft l. A rod r' connects the lever r and a centrally-pivoted lever s, and a pin t<2>, Fig. 5, on an arm t<1> fixed to the shaft t engages in a slot s<2> in a link s<1> hinged to the lever s. To give a dwell to the healds at the end of each movement, the arm t<1> is held in its left and right positions by weighted pawls u, u<1> respectively, until the link s<1> has been moved the length of the slot s<2> in the opposite direction, when the lower end of one of two levers t<3>, t<4>, pivoted on the arm t<1> and resting against the ends of a slot formed by a strap fixed to the links s<1>, strikes against the pawl and releases the arm t<1>. Loom shuttles; shuttle-races; picking-motions.- The weft wire is wound on a drum d, Fig. 3, mounted to rotate in a horizontal plane on a slide d<2> which moves in a transverse guide-way i. The wire is guided from the drum by an eye d<3> in a frame d<1>, and is kept in place on the drum by a spring band. The guide-way i has transverse grooves i<1> to accommodate the tubes c', c<3> in their lower positions. The picking-mechanism comprises a slide k, moving in the guide-way i and connected by a rod k<1> to a crosshead k<2> which has downwardly-extending projections k<3>, k<4> on opposite sides. The projections k<3>, k<4> are engaged in turn by tappets k<11>, k<12> on two endless chains k<5>, which are moved in opposite directions by sprocketwheels k<9> driven through bevel, chain, and spur gearing from the shaft l. An intermittent reciprocating motion is thus given to the slide k, on which is pivoted a hook k<13>, shown resting on a tooth of a crown-wheel k<14>. A pawl pivoted to a spring-controlled push-rod k<16> engages with ratchet - teeth on the periphery of the crownwheel. When the slide k is moved to the right, the push-rod k<16> is pressed against the frame d<1>, and moving against the action of its spring k<17> turns the crown-wheel by means of the pawl and ratchet teeth, causing the hook k<13> to fall from its supporting-tooth and take into an eye d<5> on the frame d<1>. The tappet k<12> then strikes the projection k<4>, and the slide is moved back, carrying the frame d' with it. The play of the hook k<13> in the eye d<5> relieves the pressure of the rod k<16> against the frame d', and the spring k<17> moves forward the rod, so that the pawl takes into the next ratchet tooth. When the framed' has passed through the shed, the healds are reversed, and then the frame is pushed back by the motion of the slide to the right. The rod k<16> is again pressed against the frame d<1>, and the crown-wheel k<14> is turned as before, causing the hook k<13> to ride up on to the top of the next tooth on the crownwheel. In this position the hook is disengaged from the eye, and the slide returns without the frame d<1>. After the next shed is formed, the cycle is repeated. Loom lays; reeds; beat-up motions.-The lay m<4> has no shuttle-race, and the reed m consists of a comb open at the bottom. Shafts m<2>, p' are rocked by links m', p<2>, and rods o<3>, o<4> respectively from a crank-pin o<2> on a spur-wheel o' driven by the spur-wheel l<1>. An arm on the shaft m' is pivoted to the top of the lay, and the lower end of the lay is adjustably connected by links to arms on the shaft p'. The links and levers move the reed m in an elliptical path, to descend into the warp behind the weft wire, bend it up, and then rise free of the warp. Looms, forming and protecting selvages in.-In order that the selvages may be properly formed, the weft wire after each beat up passes round one of two pins n, which are raised through brackets by links n<5>, levers n<3> pivoted to frames n<4>, and links n<2> hinged to the links connected to the lay. To adapt the loom for weaving narrower fabrics, the brackets supporting the pins n and the pivots connecting them to the links n<5> are lengthened. Loom take-up motions.-The woven fabric passes over a roller f and under a roller g to the cloth beam h. The roller f consists of a number of sprocket-wheels mounted on a shaft, so that the teeth engage with the meshes of the fabric. After each beat-up, the roller f is revolved one step to withdraw the weft just beaten up from the sphere of action of the reed. This motion is effected by means of connected levers v, v<1>, centered on the shafts of the rollers f, g, and vibrated by a rod r<2> hinged to the lever r. Pawls pivoted to the levers v, v<1> actuate ratchet-wheels on the shafts of the rollers f, g alternately after each beat-up, and as the roller f is geared with the roller g it is moved one step after each beat-up. A short shaft q, geared to the cloth beam h, is driven by spur and belt gearing from the main shaft. Overdriving of the beam h is prevented by the slipping of the belts.