Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1991-06-03
1992-11-03
Gilreath, Stanley N.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242157R, B65H 5120, B65H 5724
Patent
active
051600978
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention refers to a yarn storage and feed device.
In yarn storage and feed devices the yarn should be treated as gently as possible along its yarn path through the device and it should be subjected to the smallest possible frictional loads when it comes into contact with components of the device several times. Part of the components of the device rotate relative to the running yarn, the yarn is carried along and deflected, or it circulates relative to stationary components, it oscillates and is subjected to jerky acceleration and deceleration and is moved between spaced guide surfaces in a balloon-forming manner. Yarn guide surfaces, which are coated with sintered ceramic material or which are made of said material, are normally provided at the locations at which yarn contacting is to be expected. Up to this day, conventional abrasion-proof sintered material has been used for this purpose. In spite of increasingly high yarn speeds, e.g. 2,000 m/min and more, a more and more compact structural design is aimed at in the case of modern yarn storage and feed devices for modern textile machines, e.g. jet weaving machines, so that especially the forces acting on the yarn along the yarn path become increasingly important. The quality of a yarn storage and feed device is judged on the basis of its reliability, i.e. the frequency of yarn breaks in operation, since each yarn break will cause a standstill of the textile machine supplied and perhaps of additional systems following said textile machine. Each standstill will result in a loss of production causing high financial losses. Yarn breaks occur predominantly between the feed area and the storage member of the yarn storage and feed device, i.e. in an area where the yarn is normally subjected to friction as well as to a deflection so that it is natural to suspect that there is a connection between the yarn break frequency and the yarn guide surfaces and the influence of the yarn guide surfaces on the yarn.
The object of the present invention is to provide a yarn storage and feed device of the type mentioned at the beginning by means of which the frequency of yarn breaks can be reduced.
In accordance with the present invention, there is provided a yarn storage and feed device for textile machines, comprising a storage body defining a storage surface, a winding member for the yarn, the winding member and the storage member being rotatable in relation to each other for transporting the yarn from a feed side of the device onto the storage surface of the storage member and for forming a yarn supply from which the yarn is removed towards the take-off side of the device, said device further comprising yarn guide members which are arranged in the yarn path from the feed side to the take-off side and formed as moldings and which comprise yarn guide surfaces coated with a ceramic sintered material or composed of a ceramic sintered material, the yarn being deflected on the yarn guide surfaces at various angles, at least the yarn guide surface having a large deflection angle being formed on a high-density sintered molding of hard material made by hot isostatic pressing in an encapsulation.
Surprisingly enough, the frequency of yarn breaks can be reduced by using this sintered material at least in guide surfaces having a large yarn deflection angle. The cause of this surprising improvement is, presumably, that the friction between the yarn and the guide surface is substantially reduced due to the nature of the material used, and this reduced friction will result in smaller mechanical loads on the yarn, and this will have a positive effect on the quality of the yarn storage and feed device especially in the case of higher yarn speeds. Surprisingly enough, it turns out that, in comparison with the friction caused by conventional sintered material, the friction will be reduced for practically all types and qualities of yarn by the use of the present sintered material, i.e. although the frictions which can be measured in the case of a synthetic yarn as
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Bengtsson Alf
Josefsson Par
Gilreath Stanley N.
Iro AB
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