Textiles: spinning – twisting – and twining – Apparatus and processes – Unitary multiple twist devices
Patent
1996-10-09
1998-05-12
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Unitary multiple twist devices
57 5854, 57 5855, 57 5883, 57352, 242131, 2421311, 2425946, D01H 110
Patent
active
057492107
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a creel for supplying yarns directly to an apparatus for collectively processing the yarns, such as a loom or a warper, or to a yarn winding apparatus such as a bobbin winder, while twisting non-twisted yarns in a single twisting manner or in a two-for-one-twisting manner.
BACKGROUND ART
In the conventional art, when a belt-like fabric such as a safety belt or a sling belt is woven by using twisted yarns as warp, a beam formed by a predetermined number of twisted yarns wound thereon is loaded on a loom, or a creel carrying a plurality of bobbins of twisted yarns is used, from which the twisted yarns are fed to the loom.
When the twisted yarns are used as warp, the following problems may occur.
It is a custom that the twisting operation itself is generally not carried out by a fabric maker but is done by outside twisters. Therefore, although it is necessary to change a twisting degree in accordance with the required feelings of the individual fabrics so that the nature of a yarn is modified to be suitable for the use of a fabric, the change of twisting degree is substantially impossible after the yarn has been twisted even if it is found to be unsuitable, and the twisted yarns must be used as they are. Moreover, a length of yarn wound on a bobbin may vary from one bobbin to another resulting in a considerable amount of wasted twisted yarn.
Further, since a length of twisted yarn wound on a bobbin is at most one half, usually one third, of a length of large-packaged raw yarn, it is necessary to change the exhausted bobbin of twisted yarn for a new one and tie the two together. This results in not only a troublesome manual operation but also an increase in waste because the tied portion of yarn cannot be used for producing a fabric for certain uses and must be scrapped. As described above, there are many inconveniences in the process for the production of a woven fabric wherein twisted yarns are used as warp, compared with another process wherein non-twisted yarns are supplied directly to a loom from a creel as described below.
That is, the process wherein non-twisted yarns are directly supplied as warp from the creel is more advantageous from the viewpoint of production efficiency compared with the former process, for the following reasons. Since large-packaged raw yarns are used, it is unnecessary to tie the raw yarns together during the weaving operation; a rewinding process and warping process are eliminated; and it is unnecessary to rely on an outside twisted yarn maker for the twisting operation of raw yarn. However, there are problems in the process in that the quality of the resultant product is relatively inferior. For example, the resultant product has a feeling limited to a softer range and has a lower wear resistance because the non-twisted yarn is used, and the production process becomes troublesome when a certain type of yarn is used due to the generation of a large amount of fluff during the weaving operation due to filament breakage, whereby, in a worst case, it is necessary to stop the loom and restore the loom to a normal state.
To solve the above problems, the present inventors proposed, in Japanese Patent Application No. 57-029084, a creel provided with a plurality of twisting devices of a flyer type on bobbins, each carrying an non-twisted yarn, so that the non-twisted yarn is twisted while being supplied from the bobbin. Although the purpose for supplying a large-packaged non-twisted yarn while twisting the same to a loom has been attained according to this invention, it has been found that the installation cost becomes large.
Next, the present inventors proposed in Japanese Patent Application No. 60-189847, to achieve the same object with a relatively small installation cost, a creel using a ring-traveller type twisting device, which is simpler in structure and relatively inexpensive compared with the aforesaid flyer type twisting device.
However, the installation cost thus lowered was still expensive relatively to the twisting cost.
REFERENCES:
patent: 4332129 (1982-06-01), Schipper et al.
patent: 4789008 (1988-12-01), Kikuchi
Kikuchi Koichi
Tukamoto Tadashi
Kikuchi Kogyo Co., Ltd.
Slifkin Neal L.
Stryjewski William
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