Textiles: weaving – Warp manipulation – Shedding
Patent
1980-05-26
1982-10-26
Jaudon, Henry
Textiles: weaving
Warp manipulation
Shedding
D03C 900
Patent
active
043556655
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a heddle provided with a thread guiding eye.
2. Description of the Prior Art
Heddles in looms serve the purpose of raising or lowering the warp threads, which run through the central eye of the heddle, for forming the shed. Heddles of yarn, of metal and of plastic are known. In the case of yarn heddles the thread guiding eye is formed by an appropriate knotting of the yarn itself or a thread guiding eye of metal is woven or tied in. In the case of metal heddles the thread guiding eye is formed either by piercing a double wire soldered together, by stamping out from a round wire rolled flat or from a rolled broad strip, depending upon the type of material the heddle is made from, or a thread guiding eye, also known as a mail, is soldered into a recess in the split heddle. Known heddles of plastic are stamped in such a way as to include the thread guiding eye.
Considerable importance is attached to the thread guiding eye, since it is subjected to wear by the warp thread passing through it and the warp thread must not be damaged by friction. As inserted thread guiding eye of metal can best meet this requirement since the necessary fine machining, such as polishing, is possible during its manufacture and the thread guiding eye is internally rounded in the manufacturing process. In addition, a thread guiding eye of this type may be casehardened. With these thread guiding eyes, however, the expense of tying or weaving them into a yarn heddle is disadvantageous. Such an expense renders the heddles more costly. In addition, metal heddles are relatively heavy, so that the thread speed or the number of weft rounds is limited on account of the weight of the shaft.
SUMMARY OF THE INVENTION
The object of the invention, therefore, is to provide a heddle which has a wear-resistant thread guiding eye, may be manufactured relatively inexpensively and which makes possible a large number of weft picks.
The heddle construction according to the invention comprises a plastics material portion in which a warp thread guiding eye is inserted. The thread guiding eye is formed of a material which is glass or metal, wherein the thread guiding eye is embedded in the plastics material. The thread guiding eye is surrounded by the plastics material along its circumference and the edges of the thread guiding eye are interengaged by the plastics material.
A heddle of this type has generally the same advantages as a metal heddle with an inserted thread guiding eye, but it is considerably lighter than a metal heddle and is less noisy in operation since its end slots, which are brought into contact with metal, consist of plastic. In addition, it is rust-proof.
The invention also relates to a method for the manufacture of the heddle, in which the thread guiding eye is placed in an injection mould and the plastic is injected around it.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the invention is explained in greater detail with reference to the drawing, in which:
FIG. 1 is a plan view of a heddle with closed end slots,
FIG. 2 is a cross-section along the line II--II of FIG. 1,
FIG. 3 is a cross-section along the line III--III of FIG. 1, and
FIG. 4 is a cross-section through an injection mould for the manufacture of the heddle according to FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The heddle illustrated in FIG. 1 has an inserted thread guiding eye 10 at its center and a closed end slot 12 and 14 respectively at each of its ends. The longitudinal parts 22 and 24 on opposite sides of the central part 16, which is enlarged in the area of the thread guiding eye 10, and the end portions 18 and 20 respectively, which are enlarged in the areas of the end slots 12 and 14, are shown shortened. The thread guiding eye 10 has an elongated opening 26. Instead of the closed end slots 12 and 14, the heddle can also have open end slots, which are used in particular in shaft weaving.
It is apparent from FIG. 2 that the cross-section of the longitudinal part 22
REFERENCES:
patent: 887102 (1908-05-01), Lackey
patent: 1413949 (1922-04-01), Wagner
patent: 1930151 (1933-10-01), Smith
patent: 3960182 (1976-06-01), Schwarz
Demin, "Konstruktsii pressform dlya plasticheskikh mass", 1952, pp. 38-39, Section 14, and FIGS. 16-18.
Burkhalter Hans
Ramseier Paul
Bracker AG
Jaudon Henry
Kleeman Werner W.
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