Weaving heddle having end eyes formed by pressing

Textiles: weaving – Warp manipulation – Shedding

Reexamination Certificate

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Details

C140S072000

Reexamination Certificate

active

06213162

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates a weaving heddle made of a strip material and a process for making the heddle. The invention relates more particularly to the formation of the heddle end eyes which, as known, permit the heddles to be lined up and hung in heddle frames.
It is known that weaving heddles have been used for many years in many weaving mills and it is not surprising that certain limits in efficiency have been reached. Since the cross-sectional dimensions of the metal strip used in making the weaving heddle have essentially remained unchanged, the cost of polishing remains low. Moreover unhardened steel strip material has been utilized in most cases. Both such factors allow for the production of a low cost heddle but also one which is not particularly efficient. Even with the great advancements in the weaving technology, such heddles are still used in very modern facilities because the mechanical life-span of the heddles is about the same as the limited useful life of the thread eyelet. The thread eyelet may however become damaged by modern synthetic fibers quite quickly to a degree that weaving is not made possible. Even more expensive materials such as hardened steel do not produce in most cases improved conditions in proportion to the higher expense. Thus there is a great deal of interest in the textile industry for a more efficient design of the traditional type of heddle.
Such heddles as they are currently used in great numbers, are generally disclosed in detail in U.S. Pat. No. 748,713. The end eyes as therein described are made by punching out an elongated rectangular opening from the strip. Thereafter the narrow sides of the opening are squeezed-pressed resulting in the longitudinal sides being deformed and the opening being enlarged. One disadvantage is the formation of wedge-shaped pressed areas at the narrow sides of the opening. These make contact with the heddle slide bar that runs through the openings such that these areas become damaged quite quickly thereby rendering the heddles unserviceable.
German patent 180525 discloses an improvement over the U.S. Pat. No. 748,713 in the formation of heddle end eyes by first deforming the area of the end eye by squeeze-pressing it into the desired width and then punching out the weakened sections so formed. It appears that a substantially strengthened end eye is produced by the removal of the thin pressed sections. However, formation of the end eyes according to such a method can be realized with only a very soft original material which diminishes the overall advantages offered by the end formation technique.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a weaving heddle having end eyes formed in a manner which improves upon that of German 180525 and which the strip of material from which the heddle is made is substantially stronger to thereby meet the requirements of modern day weaving mills.
In accordance with the invention a weaving heddle is made of an elongated strip of material having squeeze-pressed and punched out end sections forming end eyes adjacent the terminal ends of the strip. Each of the end eyes is defined by a pair of spaced apart side legs lying parallel to the longitudinal axis of the strip. The side legs have outer edges extending laterally outwardly of opposed outer edges of the remainder of the strip. And at least one of the opposing faces of the strip has at least one deformation defining an indentation adjacent one end of each of the end eyes.
In the production of the weaving heddle according to the invention, there is provided at first a squeeze-pressed section oriented in a longitudinal direction in the area of the end eye to be formed, and preferably lying along the longitudinal axis of the strip such that the strip is widened in the area of the end eye to be formed, and the end eye is formed by subsequently punching out the strip material at the squeeze-pressed section. An additional squeeze-pressed section is applied simultaneously at a distance from a short end of the eye to be formed, and preferably additional pressed sections are formed at distances from both short sides of the eyes to be formed. Thus three squeeze-pressed sections are formed in the area of end eye to be formed. When such squeeze-pressed sections are formed simultaneously, each end eye is subsequently formed by punching out the squeezed material from that pressed section of the eye to be formed.
Between the three pressed sections, there remain two narrow ridges for areas that are undeformed. The two auxiliary pressed sections adjacent the short ends of the end eye as formed function to extend the area from the widest section of the deformed end eye to the non-deformed strip to thereby minimize the development of any stresses in the material. In other words the auxiliary pressed sections which form deformations provide for elongated and smoother transitions between the widened section of the strip from which the end eye is formed, and the undeformed portions of the strip. Moreover the two auxiliary pressed sections may be shaped in such a manner that the ridges are slightly puffed so that the thickness, even with the widening of the strip in this area, correspond approximately with the thickness of remaining strip. The end eyes are formed by punching out the middle squeeze-pressed section, the punched areas overlapping the slightly pushed-up ridges so that a large bearing surface for the heddle slide bar is formed. This relatively large bearing surface prevents premature material wear. Thus in addition to using strip material with increased stability, the heddle produced according to the invention meets stress requirements found in the modern day weaving mills.


REFERENCES:
patent: 748713 (1904-01-01), Fehr
patent: 1517129 (1924-11-01), Ruegg
patent: 3049151 (1962-08-01), McFetters
patent: 5699836 (1997-12-01), Golz
patent: 180525 (1905-09-01), None

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