Abstract: The invention relates to the textile industry and, more particularly, to weaving machines.The device comprises: a support (1) to be fixed on the weaving machine; a first lever (2) oscillating on the said support and provided with at least one tongue (3) which has at its end an eye (27) for guiding an additional warp thread; a second lever (6) also oscillating on the support (1) and provided with two bars (7) which are mounted in sliding fashion against each other in a direction parallel with the fell and which each have at least one eye for guiding a crossing thread; means (15, 16, 34, 35) for actuating pivoting of the two oscillating levers (2, 6); and means (49, 55, 65) for actuating sliding of the bars (7) for guiding the crossing threads, arranged so that each crossing thread passes alternately on either side of the corresponding additional warp thread.The invention is applicable to shuttleless weaving machines.

Abstract: The invention relates to a process for the insertion of a weft yarn in the shed of a weaving machine in which said weft yarn is drawn from a reserve located outside the shed to be inserted in the form of a loop of which one of the ends is fastened and the other thrown, wherein an air stream is blown in the shed in the direction of insertion of the weft, the speed of this air stream being less than or at the most equal to the speed of the thrown end, the action of this air stream being such that it tends to maintain the two ends of the loop separate from each other.

Abstract: The invention relates to a device for the preparation and insertion of at least one type of weft yarn into the shed of a weaving machine. The said device comprises a yarn metering-delivering member feeding a storage chamber used for temporarily storing a length of weft yarn before its insertion into the shed. The introduction of the weft yarn into the storage chamber and its extraction to be thrown by means of rotating rollers are effected via a single guiding channel which comprises a zone situated between the throwing rollers and close to the gripping line, said zone overlapping laterally with respect to the rollers and comprising a continuous longitudinal slot.

Abstract: A device adapted to be introduced into the shed of a weaving loom. The device is designed to facilitate insertion of a weft by an air stream. The device has a plurality of leaves which are spaced apart to allow the passage of the warp yarns. The leaves are placed in front of the reed and are provided with a recess, which recess is situated opposite the teeth. A portion of the reed, opposite to the recess, has a sharp-edged profile while the remaining portion has a round and smooth edged profile.

Abstract: A device for the insertion of a weft thread into the shed of a weaving machine is equipped with a delivery system for depositing a pick of weft thread from a weft thread storage space into a thread collecting unit; an insertion mechanism, placed between the delivery system and the thread collecting unit, which is adapted to intermittently insert, in synchronism with the cycle of the loom, the pick of weft thread into the shed between the warp threads; and a novel feeding system for feeding the pick of weft thread from the thread collecting unit to the insertion mechanism. The feeding system may be adapted to move unidirectionaly or alternately, or continuously or intermittently. This system is equipped with gripping devices that move through a predetermined path which is outside the trajectory of the insertion device. As the grippers move through their path the pull the pick or weft thread such that it is fed into the insertion mechanism.