Producing a multi-ply fabric on a loom having auxiliary end reed

Details Producing a multi-ply fabric on a loom having auxiliary end reed Producing a multi-ply fabric on a loom having auxiliary end reed

1987-11-04

1990-02-27

Falik, Andrew M.

Textiles: weaving

Weft manipulation

Lays or beat-ups

139188R, 139192, 139411, D03D 4968, D03D 1100

Patent

active

049037374

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a method for the production of fabrics, and more especially to the production of multi-ply fabrics, wherein the fabrics are made completely, or at least predominantly, from extremely delicate technical grade fibers such as carbon fibers, glass fibers or the like. The invention furthermore relates to a loom used to make such fabrics and to the fabrics themselves.
2. The Prior Art
British Pat. No. 2,066,308 describes three-dimensional fabrics made of carbon fibers or glass fibers. There has also been proposed a method for weaving carbon fibers wherein impacts are avoided so as to take into account their extreme brittleness, which is caused by their temperature coefficient of near zero.
Furthermore, European Pat. No. 00 56 351 describes a sheet-like fabric consisting of high-strength material, such as metal fibers, carbon fibers, aramide fibers or mixtures thereof. This sheet fabric is made into a particular shape.
In known systems the result produced has been unsatisfactory because after each filler thread has been inserted into the shed in a conventional loom it has been beaten. In this regard, the dents of the reed rub along and damage the warp threads both during forward and backward motion thereof. In the case of high or very high filler thread counts, there is a proportionality between the respective stroke of the reed, the warp, the filler thread count and the stroke of the sley.
In order to reduce rubbing damage to the delicate warp material, it has been proposed to weave post-twisted warp material or warp material with fibers wrapped around the warp material. However, this results in a reduction in relative strength to the entire fabric, which in many cases is not acceptable.
The object of the present invention is to avoid the above-mentioned disadvantages and to devise a method and an apparatus for creating a fabric whose delicate warp threads have not been impaired during manufacture, even when there is a high filler thread count.


SUMMARY OF THE INVENTION

According to the invention the warp threads of delicate material are mounted on a loom having a main reed and at least one filler (weft) thread is inserted in each shed provided in the fabric without beating, and only after a plurality of filler threads have been inserted is the main reed of the loom moved to beat the filler threads. In this way, frictional contact between the main reed and the delicate warp threads is reduced, thereby improving the quality of the produced fabric. Preferably, the fabric is produced on a loom which has independently operable auxiliary end reeds at opposite ends of the main reed, and the delicate warp threads are mounted on the loom to extend through the main reed and warp threads of a more robust material are mounted on the loom to extend through the auxiliary end reeds. One or more filler (weft) threads are inserted in each shed formed in the delicate threads and the robust threads, and as each filler thread is inserted the auxiliary end reeds are moved to beat the portions of the weft filler threads associated therewith. However, only after a plurality of filler threads have been inserted in one or more sheds and beaten is the main reed moved to beat the portions of the weft filler threads associated therewith, thereby greatly reducing rubbing contact of the main reed against the delicate warp threads that extend therethrough. The edges of the produced fabric containing the robust warp threads (selvedge) can be subsequently cutoff.
The method and apparatus in accordance with the invention offers the advantage that delicate yarns of the type mentioned may be woven into fabrics with appropriate weaves so as to have filler thread counts of 20 to over 150 per cm and so that the production of technical grade fabrics with a three-dimensional structure (multi-ply fabrics) and a very dense arrangement of the filler and warp threads becomes possible. Even in the case of a correspondingly high number of filler threads, the friction of the r

REFERENCES:
patent: 808976 (1906-01-01), Dornan
patent: 4036265 (1977-07-01), Malasek et al.
patent: 4078586 (1978-03-01), Porter et al.
patent: 4256148 (1981-03-01), Scharling
patent: 4320160 (1982-03-01), Nishimura et al.
patent: 4379735 (1983-04-01), MacBean

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