technological conditions such as special operating modes and operating states the tandem nozzle 8 can be suitably orientated in any desired direction with respect to the main nozzle 6 fig8 shows schematically the illustration of an arrangement in which the tandem nozzle 8 and the main nozzle 6 are not arranged in alignment even with corresponding reduction of the cloth width significant advantages result in contrast with the prior art if the cloth width is correspondingly reduced the main nozzle 6 and the tandem nozzle 8 can both be placed on the main profile part 4 in the sley apparatus in accordance with the invention the auxiliary profile part 5 can likewise be removed in such a case so that the additional mass of the auxiliary profile part 5 need no longer be co moved if for specific reasons the use of a main nozzle 9 of increased length becomes necessary in the case of a non reduced cloth width the main profile part 4 can be extended in a simple manner in the sley apparatus in accordance with the invention through the auxiliary profile part 5 with it being possible to connect the auxiliary profile part 5 for example directly to the main profile part 4 as shown in fig7 naturally a rotationally fixed connection between the auxiliary profile part 5 and the main profile part 4 can also be produced in a manner different from that shown in fig7 in summary the above description shows that the flexibility of a jet weaving machine is considerably increased in contrast with the prior art through the use of a sley apparatus in accordance with the invention as is already shown by the few selected variants of some.