Textiles: weaving – Warp manipulation – Shedding
Patent
1997-04-15
1998-08-11
Falik, Andy
Textiles: weaving
Warp manipulation
Shedding
403329, 24616, D03C 340
Patent
active
057913820
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the Jacquard mechanisms for the milling on looms and it relates, in particular, to the harnesses that are attached to the moveable operating elements of these mechanisms for the control of the warp yarn.
2. History of the Related Art
It is known that a harness of typical construction comprises a multitude of twines, the number of which is equal to that of the mechanism's operating elements; each of these twines is tied in with one or several harness cords which, in turn, are fastened to the eyeletted heddles. The fastening of these twines and of the harness cords is by means of snaps, of very poor control, and it can be seen that the disassembling and the subsequent reassembling of a harness be it for repairs or its replacement, implies the handling of several thousands of snaps. Therefore, the operation is lengthy and tedious, thus causing a costly interruption of production.
Consequently, the chief object of the present invention is to remedy this inconvenience, to wit, by using a collar joint that is designed in a such manner so as to render a simple and quick operation, requiring that only one piece be moved in an axial direction.
In a technical field other than that of the invention, Patent EP 197,331 discloses, for example, jewelry clasps having a pointed end and a shuttle, that are used under very different conditions than those of looms.
SUMMARY OF THE INVENTION
The collar joint in accordance with the invention comprises two elements, male and female, that are affixed, respectively, to the extremities of the twine and of the harness cord to be fastened, in such a manner that one of these elements can axially fit into the other. The female element comprises at least one chuck whose jaws are shaped so that they grip the male element directly behind a prong provided at the end of the male element. Behind the prong, the male element is provided with an axially moveable sleeve or shuttle in order to ensure the operation of the jaws when they are opening or closing. The bearing area of the jaws against the back of the prong is essentially parallel to the back of the prong when the chuck is in a closed position.
According to an advantageous embodiment of the invention, the bearing area of the chuck against the back of the prong is essentially radial when the chuck is in a closed position. Thus, the vibrations due to the movements of the loom and of the surroundings that constantly act upon the jaws cause them to be flexing, which is suitable to their geometry. Therefore, there is no risk of wear and tear or of a breaking of the jaws because such a risk would exist in the case of a collar in which the jaws would rest on a ridge or on their edges against the back of the prong. The jaws would thus be acted upon by creep and their pin shaped extremities would be worn out by multiple contacts with the prong.
In an another advantageous embodiment of the invention, the bearing area of each jaw against the shuttle is essentially axial when the chuck is in an open position. This causes the stresses transmitted by the chuck to the shuttle to be radial, that is to say, perpendicular to the shuttle with respect to the rest of the male element. Thus, the shuttle does not tend to be displaced by the axial stresses imparted by the jaws and, in particular, there is not risk that these stresses move it to the opposite side of the prong.
Consequently, the axial length of the shuttle is greater than the distance between the external surface of the jaws and the back of the prong when the male element is completely inserted into the female element. The shuttle does not to slip from the jaws when being pushed back between the jaws and the prong. This features makes it possible to prevent the risks of a jamming of the shuttle.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and some of its other advantages will be more clearly elucidated in light of the below description of an embodiment of a removable collar
REFERENCES:
patent: 5636663 (1997-06-01), Lacroix
patent: 5671782 (1997-09-01), Lemaire et al.
Froment Jean-Paul
Lacroix Jean-Jacques
Falik Andy
Staubli Faverges
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