Loop holding mechanism for use in a multi-axial yarn structure f

Details Loop holding mechanism for use in a multi-axial yarn structure f Loop holding mechanism for use in a multi-axial yarn structure f

1998-02-09

1999-09-07

Falik, Andy

Textiles: weaving

Special-type looms

139DIG1, 442204, D03D 4100

Patent

active

059471603

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a loop holding mechanism for holding and engaging loop portions of yarns successively produced at opposite side edges of a multi-axial yarn structure being formed and a machine for forming a multi-axial yarn structure.
It has been proposed to provide a machine for producing multi-axial yarn structures in which warp yarns are supplied in a warp feed direction in the form of a warp sheet and in which a yarn transfer device is provided which subjects warp yarns to successive bias yarn forming steps in which each yarn is caused to move in a succession of lateral transfer steps in a first weft direction to move from a first bias yarn reversal position to a second bias yarn reversal position and then to move in a succession of return lateral transfer steps in the opposite direction from the second bias yarn reversal position to the first bias yarn reversal position thereby to form a non-woven bias yarn assembly comprising two 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 the warp feed direction and in which each bias yarn at each reversal position in proceeding from a transfer step in one direction to a transfer step in the opposite direction forms a bias yarn loop portion.
In publication EP 0263392-A2 there is disclosed a machine for forming a two dimensional tetra-axial woven yarn structure 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. The machine includes a yarn transfer device for progressively transferring yarns fed to it to provide the sub-assemblies of oppositely inclined bias yarns and in one form of yarn structure produced, the bias yarn sub-assemblies are arranged between outer warp yarns and outer weft yarns and the warp yarns are woven with the weft yarns to hold the intermediate bias yarns in place in the fabric.
The weaving together of the outer warp yarns and outer weft yarns in the machine disclosed in EP 0263392-A2 serves to hold the intermediate bias yarns in place in the structure and tensions in the bias yarns arising from their displacement by the traversing device are adequately absorbed in the woven structure thus formed.
In WIPO publication No. WO92/14876 a method of forming a three-dimensional woven yarn structure is disclosed in which use is made of a yarn transfer device for transferring yarns in the weft direction to provide bias yarn arrays in which the yarns are inclined to the warp feed direction and in which the arrays of inclined bias yarns are woven into other arrays of yarns by selective shedding of the yarns and insertion of weft yarns to produce the three-dimensional structure.
Again, the weaving of the arrays of bias yarns with other arrays of yarns and the insertion of weft yarns in the method disclosed in WO92/14876 allows the tensions in the bias yarns to be absorbed.
In U.S. Pat. No. 5,137,058 there is disclosed a machine for forming a three-dimensional yarn structure embodying warp yarns, weft yarns and non-woven bias yarns which are held together by binding warp yarns which pass through the yarn structure between adjacent non-binding warp yarns. The machine includes a yarn transfer device for progressively transferring yarns fed to it to provide non-woven sub-assemblies of oppositely inclined bias yarns which are fed into a binding zone where they are held in place within the warp and weft yarn structure by the binding warp yarns. The binding warp yarns are held captive at the upper and lower faces of the yarn structure by weft yarns inserted at each face. In addition, the bias yarns of the bias yarn sub-assemblies are held in place at their yarn reversal positions along each edge of the structure being formed by an outer binding warp yarn which passes through the bias yarn loop portions formed at the yar

REFERENCES:
patent: 5137058 (1992-08-01), Anahara et al.
patent: 5431193 (1995-07-01), Mood et al.
patent: 5540260 (1996-07-01), Mood

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