Improvements in the Method of and in Looms for Weaving Pile Fabrics.

Реферат: 15,283. Costikyan, N. July 25. Weaving pile fabrics of the orientalrug type, having Persian knots on pairs of ground warp threads. The knots are formed by crossing the warps a, a<1>, Fig. 21, passing the pile thread b between the crossed warps by means of a needle F, uncrossing the warps a, a<1>, thereby causing the pile thread b to assume the form shown in Fig. 22, passing the end b<1> of the pile thread between the uncrossed warps, Fig. 23, and finally cutting the pile thread at b<4>. The tufts may be formed on the upper or the under surface in the loom, and the operation may be reversed by passing the pile thread between the uncrossed warps, then crossing the latter, and finally passing one pile end between the crossed warps. Three or other number of wefts are inserted between the rows of knots. Looms for weaving pile fabrics in the manner described above. The ground warps a, a', Fig. 1, pass from a beam or beams B, and are shed by healds D, D', and the woven fabric d passes under the breast beam E, and partly round a spiked roller E<1> and a loose roller E<2>. Back - bearers ; warp tension, regulating.-The ground warps pass over a tension rod C, which is preferably mounted on arms C<1> on a shaft C<2>. An arm C<3> is secured to the shaft, and is acted upon by a spring C<4> to give the desired tension to the warps. Lays; beat-up motions.-The lay G, which comprises a series of open dents, is mounted on a shaft G<2>, on which is an arm G3 connected to the crankshaft of the loom. Pile, forming and cutting ; reeds.-The pile threads are carried by sets of tubular needles F, each set being held in a frame removably mounted on an endless carrier of the construction usual in Axminster looms. At the proper times, a frame with its set of needles F is disconnected from the carrier, and is transferred by a transferring-device F<1> to the place for forming the knots adjacent to the breast beam, and after the knots are formed the frame is returned to the carrier, which is caused to travel to move the next frame into the active position. A reed H having bent dents H<2>, Fig. 6, is fixed to the loom frame in front of the healds, and the lower vertical ends of the dents H' are in line with the dents G<1> of the lay. The warps a, u' of each pair of warps extend through adjacent spaces H<1> of the reed, and, when they are in their lowermost position, they lie in an uncrossed position and spaced apart ready for the entrance between them of the dents G<1> and the needle F. The warps a' are raised slightly, and the warps a are raised to the top of the reed H, thus crossing over the warps a<1>. The lay is then moved forwards to a vertical position, its dents entering between the crossed warps. The needles F are then passed between the crossed warps and raised, Fig. 21, and the lay is moved forwards slightly to place the pile thread b near to the fell, and is then moved to its rearmost position. The healds D, D<1> are then lowered, the warp a passing below the warp a<1>, and the warps being thereby uncrossed. The lay is again moved forwards, so that the dents G<1> pass between the uncrossed warps, and the needle F is also lowered between the warps, Fig. 23. A suitably-guided horizontal cutting-blade with a slanting edge is then passed across the loom bv suitable mechanism, and cuts the pile threads at the part b<4>, and the needles F are raised. The lay partly beats up the knot, and is then moved back, after which the shed is opened, the heald D carrying the warps a into their lowest position. A weft is then inserted by a shuttle or other weft-inserting device, and the lay beats up the weft and the knots. Two more wefts are then inserted, the shed being changed each time, and the knotting operation is repeated. A loom for forming the tufts on the upper surface of the fabric is also described, and in this loom the carrier for the needles F passes over sprocket-wheels journaled in the loom frame.