Abstract: This pneumatic supply device is designed for shuttle-free weaving machines with the picking of one or more weft threads (1, 2) by elements such as picking nozzles (5, 6) and nozzle relays (10), supplied with compressed air in accordance with predetermined sequences. A robot (25) connected to a picking sequence program support (26) drives, on one hand, electrovalves (12, 16) disposed in the compressed air inlets (13, 17) to the picking elements (5, 6, 10) and, on the other hand, switching members (20, 21) enabling these picking elements (5, 6, 10) to be supplied at at least two different pressures (P1, P2; p1, p2) selected as a function of the characteristics of the weft threads (1, 2) to be inserted. The switching members (20, 21) are, for example, proportional pressure reducers enabling the control of the air pressure in a tank (18, 22).

Abstract: A support freely pivotal about a fixed vertical axis carries a fixed blade. A lever pivoted on this support carries a pivotal blade crossing the fixed blade. One end of this lever is connected via a spring to the support so as to pivot this lever in one direction and the other end of the lever carries a barrel-shaped roller engageable with the lobes of a continuously rotating cam which open and close the blades. A pair of guides to either side of the blade ride against respective warp filaments between which a cut is to be made so that these warp filaments pivot the entire support about its vertical axis as the blades are continuously and rapidly opened and closed to cut the fabric exactly between these two warp filaments.