Device for controlling warp threads for the production of leno f

Details Device for controlling warp threads for the production of leno f Device for controlling warp threads for the production of leno f

1999-03-23

2000-07-25

Falik, Andy

Textiles: weaving

Warp manipulation

Traversing

139 54, D03D 1900, D03C 706

Patent

active

060925590

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a device for controlling warp threads for the production of leno fabrics on a textile machine comprising a reed equipped with gliders separated from each other by slots intended to guide pairs of warp threads, one of which belongs to a system of stationary warp threads, and the other, to a system of rotating warp threads. In the direction of the warp thread movement during the weaving process, a system of needles fitted with eyes for guiding the system of stationary warp threads, reversibly moveable, is arranged in front of the reed and coupled with a mechanism adapted to impart to it said reversible movement in front of which vertically adjustable heddle frames are situated. A first heddle frame has oblique slots for the passage of the rotating warp threads, the other one, a straight slot passing through the whole width of the warp for the passage of the warp thread system.


BACKGROUND OF THE INVENTION

Fabrics with leno weave show specific properties resulting from the different construction of the crossing point, the crossing proper and, consequently, the thread interlacing being achieved by the mutual turning of two warp threads around each other thereby eliminating the need to interlace the weft with said warp threads. In each weaving cycle, its position is each time over one and the same, and under the other, of the warp thread systems, said warp threads bringing about the interlacing effect not by mutually alternating the upper and the lower position but by their mutual turning around each other.
Thus, the warp threads are divided into two groups, i.e., into the stationary and the rotating ones. Special mechanisms are required to generate their mutual movement normal to their axis.
The known embodiments of such devices contain special leno heddles and return motion half-heddles.
Another embodiment makes use of shaft frames equipped with needles instead of with heddles. Here, the shaft frames, in addition to their shed forming motion, carry out a mutual reversible motion parallel with the direction of the shed insertion.
Another known method of leno weave creation is described in the patent CZ No. 280643 relating to a device for binding the fabric edge on weaving machines. Its advantage over the preceding ones consists in the method of generating the required motion of the rotating warp threads by means of an oblique slot provided in the shaft frame carrying out the standard shed motion so that, unlike the preceding embodiment, the shaft frame need not move in two directions and, consequently, the arising dynamic forces are substantially reduced, and the mechanism is simplified. In comparison with the embodiment using special heddles, this embodiment contains no further components such as half-heddles for mediating the positive contact with the warp threads and whose motion shows discontinuous changes during the heddle frame alternations that by their impacts have adverse effects on the operation frequence of the weaving machine. However, the drawback of the mechanism described in the patent CZ 280643 consists in that it permits to produce the leno weave only with a limited number of warp threads on the fabric edge, and not a complete leno fabric.
Another drawback of the described embodiment consists in that it fails to ensure the same tension in each of the two warp thread systems, and consequently, in the uneven proportionate elongation during the weaving process. For this reason, warp threads to be interlaced in this way must be supplied from special accessory warp thread bobbins, each of them equipped with an independently adjustable brake.
Another well-known device for producing the gauze weave on the fabric edge is described in EP 152 956 A2 and EP 450 120 A1, intended for double gripper looms for weaving double fabrics. For producing the edge on each fabric, it comprises one system of stationary threads, and two systems of laterally deflectable movable threads. The movable threads are led across oblique grooves responsible for their movement li

REFERENCES:
patent: 2647541 (1953-08-01), Nichols
patent: 4614210 (1986-09-01), Debaes
patent: 5123454 (1992-06-01), Debaes

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