Textiles: weaving – Fabrics – Special shape
Patent
1994-08-15
1997-01-14
Falik, Andy
Textiles: weaving
Fabrics
Special shape
139408, 139305, 139 22, 428257, 428 361, 294 74, D03D 100, D03D 1100, D03D 3500
Patent
active
055929770
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thick belt and a device for producing the same, particularly to a thick high-strength belt used, in place of a rope, as a safety belt or for a sling for a flexible container.
BACKGROUND ART
A safety belt generally comprises a metal member attached to one end of a rope and a hook attached to the other end thereof. In a sling for a flexible container, a rope is connected to a metal member attached to a container body. Usually the connection of the rope with the metal member is carried out manually by a process in which a rope end is untwisted to a group of strands which are then fixedly incorporated into the rope body. Since this process requires skill as well as considerable strength, it is difficult to obtain operators therefor nowadays. If a narrow width woven fabric is used in place of a rope, the connection may be easily carried out through a sewing operation, but the handling thereof is inferior to that of a rope due to its width.
In a woven fabric used for a sling requiring a high strength, it is necessary to weave a number of warps into a predetermined width of the fabric, whereby the fabric must be three layerd, or two layered while adding a plurality of reinforcing core yarns. An inspection of eight slings available in the market showed that the average thickness was 4.17 mm and the maximum thickness was 5.2 mm (nylon). An estimate was obtained, from the investigation of these weave structures, that the average breakage strength is 7,820 Kgf and the maximum is 10,680 Kgf (polyester) if a strength utilization ratio is assumed to be 80%. As there is a limit to the number of warps that can be woven into a predetermined width, it is necessary to weave fabrics to be undesirably wide in order that the strength requirement is fulfilled. Of course, specially high-strength yarns, such as aramide fiber yarns, may be used for this requirement, but these are so expensive that they cannot be used for general purposes.
The limitation of the number of warps that can be woven into a predetermined width of a narrow width fabric, is mainly determined by the capacity of the loom on which the fabric is produced. It is the above-mentioned slings that are designed and produced within such a strict limitation of the number of warps and thus these fabrics were produced under an extremely uppermost verge of the limitation of the conventional art. The limitations of loom will be described below.
In a needle-type narrow loom, a weft is picked into a warp shed from one side thereof, and received by a latch needle positioned on the other side so that a knitted selvage is formed. During the formation of the selvage, the weft is first caught by a hook of the latch needle. There is no problem when the weft is received by the hook from a back layer of a multilayered thick fabric, but when it is received from a front layer, the weft is liable to detach from the hook if the weft is positioned above a tip end of the hook. Accordingly, a fabric thickness under which a weaving operation is stably carried out is less than 5 mm in a gray fabric, and less than 4.5 mm after the heat-set has been carried out thereto.
In a rack-and-pinion type narrow loom, the weaving operation can be relatively smoothly continued even if a number of warps are woven, because a shuttle passes through a center of shedding while being gripped. However, there is one drawback therein. That is, it is necessary to increase the lengths of shuttle and shuttle box relative to the dimensions of the weaving window so that the shuttle is retained in the original shuttle box until a rack of the shuttle engages with a pinion of an opposite shuttle box. This results in the lowering of loom rotational speed, and since a wider space is required, the loom is generally designed as narrow as possible provided the shuttle can be safely passed. Therefore, if a shedding motion is even slightly disturbed when an extremely thick belt is woven, the passage of shuttle is obstructed and this causes a machine failure.
In a slide-hook
REFERENCES:
patent: 4209044 (1980-06-01), Taki
patent: 4354704 (1982-10-01), Mayerjak
patent: 4640317 (1987-02-01), Chardon et al.
patent: 5219636 (1993-06-01), Golz
Microfilm of the specification and drawings annexed to the written application of Japanese Utility Model Application No. 60737/1982 (Laid-Open No. 163959/1983), (Kopal K.K.), Nov. 1, 1983 (01.11.83), FIG. 1 (Family:none) No English Translation.
JP, A, 53-130134 (Yanmar Agricultrual Equipment Co., Ltd.), Nov. 13, 1978 (13.11.78), FIG. 1 (Family:none) No English Translation.
Microfilm of the specification and drawings annexed to the written application of Japanese Utility Model Application No. 128560/1981 (Laid-Open No. 34871/1983), (Kanebo Gosei Kagaku K.K. and another), Mar. 7, 1983 (07.03.83), (Family:none) No English Translation.
Microfilm of the specification and drawings annexed to the written application of Japanese Utility Model Application No. 62490/1980 (Laid-Open No. 165081/1981), (Sanshin Seisen K.K.), Dec. 7, 1981 (07.12.81), (Family:none) No English Translation.
JP, V2, 63031576 No English Translation (Forell), Jun. 24, 1988 (24.06.88), & US, A, 4640317.
Kikuchi Koichi
Watanabe Masao
Falik Andy
Kikuchi Web Tech Co., Ltd.
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