Separable collar for the harness of a Jacquard mechanism

DETAILED DESCRIPTION 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