Bias yarn assembly forming device

Details Bias yarn assembly forming device Bias yarn assembly forming device

1996-07-15

1998-07-07

Falik, Andy

Textiles: weaving

Special-type looms

139DIG1, 442204, D03D 4100

Patent

active

057753814

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a bias yarn assembly forming device for forming in a succession of bias yarn forming steps in which warp yarns of a warp sheet are displaced in opposite weft directions a bias yarn assembly comprising two superposed 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.
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.
2. Description of the Prior Art
In U.S. Pat. No. 5,137,058 there is disclosed a machine for forming a three dimensional fabric 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 warp yarns and which are held captive at the outer faces of the structure by weft yarns inserted at each face. The machine includes a bias yarn traversing device for progressively traversing yarns fed to it to provide sub-assemblies of oppositely inclined bias yarns which are fed into the weaving zone where they are held in place with the warp and weft yarns by the binding warp yarns.
In one form of bias yarn traversing device disclosed in U.S. Pat. No. 5,137,058, the warp yarns supplied to the device are passed through holes in an arrangement of guide blocks with one block for each yarn and the blocks are caused to move continuously first along an upper horizontal run in which each block follows the one-preceding it and each block on arrival at the end of the run is transferred to a lower horizontal run where it is progressively displaced in the opposite direction along the lower run until it reaches the end of the lower run where it is then moved back into the upper run. The traversing device in this form requires the use of a rotating yarn supply creel which takes the form of an endless belt or chain which supports the bias yarn supply packages and causes them to follow the movement of the bias yarns in the bias yarn traversing device. The traversing device, however, suffers the disadvantage that it requires a cumbersome endless belt creel for supporting the large plurality of supply packages.
In WIPO publication WO92/14876 a method of forming a three-dimensional woven fabric 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 fabric. In this method, each yarn which is to form a bias yarn needs to be detachably engaged by a yarn engaging heald for selectively raising and lowering the yarn during the weaving process.
International patent application No. PCT/GB94/00028 (publication No. WO94/16131) discloses a machine for producing a multi-axial yarn structure which utilises a yarn transfer device for forming a non-woven bias yarn assembly of two superposed non-woven bias yarn sub-assemblies, but which does not require the use of a rotary creel or its equivalent for the supply of bias yarns and in which repeated engagement and disengagement of yarns from healds in the weaving process disclosed in WO92/14876 can be avoided.
The machine disclosed in PCT/GB94/00028 for forming the multi-axial yarn structure comprises supply means for supplying in a warp feed direction warp yarns in the form of a warp sheet, and bias yarn forming means for forming the non-woven bias yarn assembly of two superposed non-woven bias yarn sub-assemblies.
A simple form of three-dimension yarn structure which can be produced on the yarn structure fo

REFERENCES:
patent: 3799209 (1974-03-01), Dow et al.
patent: 5137058 (1992-08-01), Anahara et al.
patent: 5204157 (1993-04-01), Matsumiya
patent: 5435352 (1995-07-01), Yamamoto et al.
patent: 5540260 (1996-07-01), Mood

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