are capable of producing different weft carrying forces more specifically the subnozzles 11 have nozzle orifices of an effective cross sectional area larger than that of the nozzle orifices of the subnozzles 13 provided the air 15 is supplied under the same pressure to the subnozzles 11 13 therefore the subnozzles 11 can exert a greater weft carrying force than the subnozzles 13 the weft insertion apparatus also includes a pair of regulators 7a 7b and a pair of subtanks 8a 8b connected respectively thereto the subtank 8a is connected through the on off valves 9 to the subnozzles 11 while the subtank 8b is connected through the on off valves 10 to the subnozzles 13 one of the regulators 7a for example has a greater pressure setting than that of the other regulator 7b as a consequence the subtanks 8a 8b supply the air 15 under different pressures to the corresponding subnozzles 11 13 for regulating the weft carrying forces produced by the subnozzles 11 13 the weft insertion apparatus shown in fig3 has groups of subnozzles 11 12 13 that are arranged in a pattern identical to that of the subnozzles 11 12 13 shown in fig1 the subtank 8 is connected to three on off valves 16 which are respectively coupled to directional control valves 17 which in turn are selectably.