Patent GB-433042-A (GB)
Title: Automatic loom for the manufacture of knot stitch carpets
IPC: D03D39/02
Filed: 1934-02-01
Abstract: 433,042. Pile-fabric looms. SOC. ANON. DE FABRICATION DE TAPIS A POINTS NOUES SAFTAN, 57, Rue d'Hauteville, Paris. Feb. 1, 1934, Nos. 3406 and 3407. Convention dates, Feb. 16, 1933 and Dec. 22, 1933. [Classes 142 (ii) and 142 (iii)] Relates to looms for weaving knot - stitch carpets by means of tuft yarn inserters or needles 12, Fig. 1, which wind the tufts around warps selected by combs c<a>, Fig. 7, on an oscillating batten c<1>, carriages f adapted to receive a complete row of needles being reciprocated towards and away from one another and from the vertical warp threads, and the needles being moved from one carriage to the other between the warp threads, as described in Specification 243,821, [Class 142 (ii)], the wound stitch knots thus formed being transformed into Smyrna knots as described in Specification 295,876, [Class 142 (ii)], by means of devices of an improved character. The parts are all controlled from three main independently-rotatable shafts 1, 2, 3 which are geared to three shafts b<3>, each having a loose belt driven clutch member b<15> clutchable to its shaft under the operation of parts controlled by three pattern chains b<11> one for each shaft 1, 2, 3. The pattern chains are all carried by a shaft b<9> operated by means described so that when any shaft b<3> is rotated all the pattern chains are advanced by one step. After one of the main shafts has made one or more revolutions, according to its controlling pattern chain, another main shaft is operated the particular order in which they rotate being described. The shaft 1 controls the mechanism for forming the ground of the fabric, the shaft 2 controls the members forming the stitches and the shaft 3 controls the devices for locking the needles 12 on the carriages f<1> and for actuating a magazine referred to below. Improved means are described, referred to below, for actuating the batten carrying the selecting combs, for moving the carriages f and locking the needles therein, for transforming the wound stitches into Smyrna knots, for cutting the tufts yarns 1 and for replacing a whole used row of needles by another row from a magazine, also for forming a shuttle race having members for deflecting the weft. The carriages f <1> carrying the needles 12 are guided by fixed guides, the inserters not being moved laterally but instead the batten c<1>, Fig. 7, being reciprocated laterally as described in Specification 293,627, [Class 142 (ii)], but by modified means. The batten is supported by links c<2> operated by lever mechanism and a cam on the shaft 1, and by other devices described whereby it is allowed to fall freely to beat up. It is guided by guides c<15> suspended by a hollow roller c<16> from a shaft c<17>. The guides are moved in a direction at right angles to the plane of warp threads, one being also operated by parts c<26>, c<27> and a cam c<29> operated by a cam on the shaft 1 to move the batten laterally so as to move the comb c<a> in a plane parallel to that of the warp thread. The carriages f<1> move towards and from one another, the needles 12 moving between the warp threads when the carriages meet and being transferred from one carriage to the other by unlocking them from the first and locking them to the other carriage. They are locked in the carriages by a longitudinally and vertically movable steel blade f<3>, Fig. 4, movable on guides, mounted on links and movable into a self locking position, shutters comprising angle-shaped grooved members g<1> having notches engageable by pivoted panels g<6> spacing the needles correctly. Reciprocating the carriages. The movement of the carriages is controlled by nuts h<3>, Fig. 1, fixed to one of the carriages meshing with a worm h<1>, turning in but movable longitudinally in fixed bearings. The worm is rotated by a wheel on a shaft provided with two loose pulleys driven by belts in opposite directions and clutched to the shaft by parts controlled by cams on the shaft 3. An adjustable stop i<1> controlled from the shaft 3 and engaged by the nut h<3> limits the return movement of the carriage according to the length of the threads on the needles 12. Magazine arrangements. After the needles 12 have inserted their threads, they are taken from the left hand carriage and inserted in a bar 4<1> held in a vertically movable changing device m<1> and by means described this bar 41 is carried to the lower track k<2> of a magazine, and a bar 4<1> from the upper track is inserted in the changing device in its place, the tuft inserters or needles 12 from this bar being then inserted into the empty left-hand carriage f and then used in turn. The bars 41 in the magazine are furnished with needles carrying threads in accordance with the pattern, means being described for moving bars 4<1> along the tracks and from the lower to the upper track. Cutting the tuft yarns. A table 5, Fig. 31, in front of the warp threads a<1> guides reciprocating hooks 7 which transform the wound stitch into Smyrna knots, and has dovetailed projections 17 covered by members 18 and beaks penetrating between the warp threads. The cutting table 20 is mounted on trunnions 21 and is operated by levers to clamp the tuft yarns, which in the present case are placed above the hooks 7. The tuft yarns are cut by several blades, &c. on a rod slidden in a grooved rod by cam controlled lever mechanism, the grooved rod being raised and lowered to place the blades in cutting position. Shuttle races, slackening weft. A race to support the shuttle is formed by fingers d<10>, Fig. 14, carried by angle pieces d on arms d<2> on shafts d<3> intergeared by wheels d<4>, which are rotated under the control of a cam on the shaft 1 to form the shuttle race. Long fingers d<11> carried by one of the angle pieces are formed with a recess d<12> to receive the weft, which is extended as shown by Figs. 15 and 16, by fingers d<13> moved by means described.