Apparatus for weft insertion in a weaving loom

An apparatus for weft insertion into successive sheds of a loom by means of a fluid, typically a gaseous fluid, by guidance and driving of weft threads through a comb having a channel which includes a main axis and is formed in passage means of a plurality of laminas carried by a slay, therebeing laminas having nozzles and laminas without nozzles, the comb being located at the fabric side of the reed, means for rocking said comb and reed, the passage means of each lamina opening on the reed side forming a channel which is tapered inwardly in a direction perpendicular away from the reed plane, the passage means having a rounded termination, the channel also tapering inwardly in the weft picking direction between two successive laminas with nozzles, each of said laminas with a nozzle being followed in the weft picking direction with a lamina having passage means larger than the passage means of a preceeding lamina with nozzle, so that the passage means opening on the reed side widens in a stepped form toward the nozzle, each nozzle being situated near a passage means opening on the reed side of the lamina and is so directed that the axis of the nozzle stream has increasing spacing relative to the reed plane in the picking direction and that the axis of each nozzle stream has a decreasing spacing relative to the main axis location in picking direction, the axis of each nozzle stream being free of intersection with a peripheral surface of that side of the passage means upon which the nozzles are located.