Process for the insertion in the form of a loop of a weft yarn in the shed of a weaving machine and weaving machine equipped with a device for carrying out this process

Claim 1

A weaving machine of the type comprising: a reserve of weft yarn located outside the shed; a metering device issuing a given length of yarn into an accumulator; an inserting member drawing the yarn from the accumulator and throwing it in the form of a loop having one end fastened and one end thrown; means for pressing against the fell of cloth the weft yarn which has just been inserted; pneumatic means producing an air stream inside the shed, during the insertion, the speed of the air stream being at most equal to the speed of the thrown end and being exerted at least over a major part of the length of said shed, said air stream tending to maintain the two ends of the loop separate from each other; wherein the air stream produced by the pneumatic means is confined inside the shed by a channel constituted by leaves spaced apart from one another to allow passage of the warp yarn therebetween; and wherein the pneumatic means comprises a single nozzle disposed near the entrance of the shed, the outlet aperture of the nozzle presenting a section similar to that of the channel.