Textiles: knitting – Needles – Pivoted latch
Patent
1984-09-04
1985-10-22
Jaudon, Henry S.
Textiles: knitting
Needles
Pivoted latch
66116, D04B 3506
Patent
active
045480567
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a stamped knitting tool for knitting machines and more particularly for knitting machine needle e.g. a latch needle, compound needle, plush hook or the like, which has a hook formed on a shank with an intermediate neck section. Up to the end of the hook or the beginning of a hook point, the hook is entirely made of a shaped material having a substantially rectangular cross section.
BACKGROUND
The knitting tools of the type under discussion are latch needles, compound needles and bearded needles, as well as plush hooks such as are used for producing plush goods, and the like.
In knitting tools of this kind, the hook in the great majority of tools has a circular cross-sectional form. The growing increase in the operating speed of knitting machines equipped with knitting tools of this kind results in ever-increasing stresses on the knitting tools in the vicinity of the hook. In order to increase the strength of the hook, the attempt has already been made to form it with a rectangular, triangular or other cross-sectional shape, such as is known for example from U.S. Pat. Nos. 2,854,836, 4,178,781 and 4,210,003. Although the section modulus of the highly stressed hook could be increased by these changes in cross section, such hooks have not become established in practice because as a consequence of the large cross section, which remains uniform over the entire hook, undesirably large dimensions on the part of the entire hook necessarily resulted. Needles with such relatively large hooks cannot be used in producing very fine grades of knitted goods, for instance, because the size of the loop or stitch, is also determined by the size of the hook, and because during loop formation a maximum amount of free space should be available for the thread at the side of the hook.
THE INVENTION
It is an object of the invention to provide a stamped knitting tool for knitting machines, the hook of which is capable of withstanding the great stresses occurring during the knitting process without thedanger of premature breakage or bending open or other damage to the hook, and which at the same time has a hook of appropriately small size.
Briefly the hook has varying cross-sectional dimensions which, beginning with a maximum value for these dimensions in the vicinity of the neck, taper steadily toward the end of the hook, or toward the region where the point of the hook begins.
A rectangular cross-sectional form of the hook produces a high section modulus during the knitting process. However, since the cross-sectional dimensions taper steadily toward the end of the hook, the hook can nevertheless be made with relatively small dimensions without thereby impairing its strength.
In order to favorable influence on the sliding of the thread on the knitting tool during knitting and to prevent the danger of thread breakage, the lateral limiting edges of the tool are preferably rounded off or chamfered, at least in the vicinity of the tapering portion.
Depending upon the type of strain on a given knitting tool during the knitting process, the knitting tool may be embodied such that each rectangular cross-sectional area points in the vicinity of the taper with its longer sides toward either the width dimension or the height dimension. It is also possible for at least the hook to be substantially square in cross section. In corresponding fashion, the neck as well may be substantially rectangular or square in cross section.
In a preferred embodiment, all the cross-sectional areas at least of the hook are similar to one another in the vicinity of the taper; this means that the taper is changes by identical amounts both in the direction of the width dimension and in the direction of the height dimension. The taper may also extend over the neck, which likewise has a rectangular or square cross section.
In the case where a knitting tool of this type is embodied as a latch needle, it is advantageous if the region of taper, beginning at a maximum value for the cross-sectional dimensions located in the vicinity of the
REFERENCES:
patent: 2685787 (1952-01-01), Noe
patent: 2854836 (1958-10-01), Morris
patent: 4178781 (1979-12-01), Virgilio et al.
patent: 4210003 (1980-07-01), Sqrillo et al.
Wignall, H., "Knitting Times", Kinetics and Economics of Weft Knitting-Part 6, Jun. 4, 1973, pp. 78-84.
Schuler Bernhard
Schuller Ferdinand
Wohlgemuth Werner
Ellis Mary A.
Jaudon Henry S.
Theodor Groz & Sohne & Ernst Beckert
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