motor the drive 4 for reciprocating the yarn transfer element 2 comprises a slider 41 an entraining member 42 a connecting link 43 a pivotable lever 45 or 45 39 and a guide 49 of the slider 41 a double arrow 46 indicates the pivoting movement of the lever 45 between the rear position and the a front position the front position being shown in chain dotted lines the guide 49 causes the slider 41 to move parallel to the slide bar 2a and at the same height as the latter for the sake of clarity various simplifications have been made in fig3 no guide tubes for the weft yarns on the body 11 between the shaft 16 and grooves 12 are shown nor are guide elements 13 see fig2 shown in the channels 12 also only one of four yarn transfer elements is shown the lateral projection 22 on the slide bar 2a serves to couple the same with the slider 41 by way of the entraining member 42 and in co operation with the arcuate groove 29 in which the projection 22 is guided when the changer 1 pivots prevents a displacement of the inoperative yarn transfer elements 2 in the picking direction a second part of the guide groove 29 is disposed in laterally inverted relationship above the horizontal plane determined by the sliding movement of the slide bar 2a center line.