To facilitate the working for changing the relative positions of the orifices of the jetting nozzle, as the degree of freedom is kept high in the change of the relative positions of the orifices of the jetting nozzle for feeding a weft to the weft feeding path formed in the reed.

A supporting block 16 is fixed to the front face of sley 12 with bolt 17 and lock nut 18. A cylindrical holder 19 is rotatably fitted to the supporting block 16. A screw 20 is screwed to the supporting block 16 and the cylindrical holder 19 is fixed to the supporting block 16 by screwing the screw 20. The nozzle 15 for assisting the weft insertion is slidably and rotatably fitted to the holder 19. The nozzle 15 for assisting the weft insertion is fixed to the holder 19 by driving the screw 21.