Abstract: In a reading device for dobby or other weaving mechanism with double swinging levers and retaining hooks, of the type in which said hooks are actuated by a disc with radial lugs or the equivalent, at least one input gear connected for rotation with the shaft of the mechanism and meshing with an intermediate gear carried by a mobile member which can be displaced concentrically with respect to the axis of said input gear, and which intermediate gear meshes with an output gear in turn with the lug disc coupled for rotation and carried by a supporting lever associated with yieldable means operative to maintain said output gear in mesh with the intermediate gear, so that by selectively angularly displacing the mobile member about the input shaft, it is possible either to achieve a simple angular shift of the lug disc to allow for unweaving during reverse motion, or alternatively to achieve the retraction of said lug disc away from the heels of the hooks in order to level all of the heddle frames.

Abstract: A shed locating device, interposed between a dobby and the shed forming of a mechanism corresponding weaving loom, of the type comprising an auxiliary motor associated with a dog clutch mechanism for coupling the shaft of said motor to the shaft of the mechanism after disconnection of the mechanism shaft from the shaft of the loom, which dog clutch mechanism comprises a sliding collar member coupled rotationally to the shaft of the mechanism and provided with two series of dog clutch teeth adapted to cooperate selectively with one or the other of two corresponding plates respectively fixed in rotation with the shaft of the loom and with the shaft of the auxiliary motor, wherein the two series of dog clutch teeth of the sliding collar member are provided on two separate ring pieces capable of moving in the axial direction independently of one another against resilient spring return means.

Abstract: A non-return device for welding installations, of the kind comprising a movable valve arranged so as to free the passage of gas for the normal supply of the torch from a welding gas generator and, by contrast, to block said passage in the case of a back-pressure resulting from an explosion in the region of the torch burner, the said valve including for this purpose closure means co-operating with a seat under the effect of resilient return means, the valve including second closure means operating inversely to the first in such a manner that the displacement of said valve, under the effect of a sudden fall in pressure downstream of the device and against return means conveniently calibrated to this effect, ensures the automatic cut-off of the flow of gas through the assembly.