Multi-axial yarn structure and weaving method

Details Multi-axial yarn structure and weaving method Multi-axial yarn structure and weaving method

1994-11-07

1996-07-30

Falik, Andy

Textiles: weaving

Special-type looms

139DIG1, D03D 1300, D03D 2500, D03D 4100

Patent

active

055402607

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to multi-axial yarn structures and is particularly although not exclusively concerned with a method of and machine for forming a three dimensional multi-axial yarn structure which embodies an assembly of bias yarns formed by two or more superposed non-woven bias yarn sub-assemblies in which the bias yarns of one sub-assembly are inclined to the bias yarns of the other sub-assembly and in both of which the bias yarns are inclined to a warp feed direction of the structure being formed.
By yarn is meant a continuous monofilament, an assembly of continuous filaments in the form of a tow or twisted together or a yarn spun from short fibres.
By warp feed direction is meant the direction in which warp yarns are fed and which is orthogonal to weft yarns in the structure being formed.


DESCRIPTION OF THE PRIOR ART

In EP 0263392-A2 there is disclosed a machine for forming a tetra-axial woven fabric embodying warp yarns, weft yarns and a bias yarn assembly having two bias yarn sub-assemblies in which the bias yarns of each are inclined to the bias yarns of the other and to the warp and weft yarns. In one form of fabric produced, the bias yarn sub-assemblies are arranged between the warp and weft yarns and the warp yarns are woven with the weft yarns hold the intermediate bias yarns in place in the fabric. The machine includes a bias yarn traversing device for progressively traversing yarns fed to it to provide the sub-assemblies of oppositely inclined bias yarns which are fed into the weaving zone where the warp yarns are woven with the weft yarns.
Three different forms of bias yarn traversing device are disclosed in EP0263392-A2. In a first form, two contra-rotating guide rolls are arranged one above the other. Each roll is provided with a helical groove by means of which yarns fed to the device are progressively traversed first along one of the rolls in a first weft direction and then along the other roll in an opposite weft direction and means are provided for transferring each yarn on its arrival at the end of one roll to the adjacent end of the other roll. In a second form of the bias yarn traversing device, an endless belt is provided having an upper horizontal run in which the belt moves in a first weft direction and a lower horizontal run in which the belt moves in an opposite weft direction. The belt is provided with spaced outwardly projecting guide pins along its length, which define openings through which yarns are fed and which guide the yarns so that the yarns in the upper run are traversed in one weft direction while the yarns in the lower run are traversed in the opposite weft direction, with the yarns transferring from one run to the other by being carried round with the belt which passes round supporting end sprockets. In a third form of the bias yarn traversing device, yarns in an upper run are progressively advanced in a first weft direction by engagement with grooves in shifting plate assembly and upon arrival at one end are transferred into a lower run where they are then traversed in a opposite direction by engagement in grooves in a further grooved shifting plate assembly.
In all three forms of the bias yarn traversing device disclosed in EP0263292-A2 the bias yarn formation is achieved by moving each yarn continuously and cyclically in one direction along a closed non-intersecting path. To accommodate such cyclical yarn movement, the bobbins supplying yarn to the devices are also required to move continuously in a closed path to prevent a winding up of the yarns upon each other on the supply side of the bias yarn traversing device. In particular, bobbins supplying the yarns are mounted on an annular creel on the supply side of the traversing device which is rotatable on supporting rollers for rotation in a plane perpendicular or inclined to the direction along which the fabric being formed is taken up.
The rotary annular creel however needs to be of substantial dimensions in relation to other parts of the machine in order to carry at its

REFERENCES:
patent: 3799209 (1974-03-01), Dow et al.
patent: 3999578 (1976-12-01), Kulczycki
patent: 4031922 (1977-06-01), Trost et al.
patent: 5137058 (1992-08-01), Anahara et al.
patent: 5224519 (1993-07-01), Farley

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