in the respective injector nozzle 6 can be selectively blown through the thread layer 18 and the stitch plate 3 by means of compressed air a thread monitor 11 is located below the injector nozzles 6 and by means of it constant monitoring of the embroidery thread 10 is done at the same time the thread monitor 11 serves to clamp the embroidery thread ends 10a located in the injector nozzles 6 or protruding from their upper blower openings 24a in such a way that the ends 10a do not slip out of the injector nozzles 6 the embroidery threads 10 drawn from the bobbins 16 are guided to the injector nozzles 6 via a thread tensioner 15 and a thread draw off device 14 additional thread guide strips 12 and 13 serve to guide the embroidery threads 10 parallel the injector nozzles 6 as can be seen from fig9 are each in communication through a compressed air hose 29 with a compressor or compressed air dispensing pressure vessel not shown between the compressor or compressed air vessel not shown one valve 7 is provided for each compressed air hose 29 the valve being controllable manually or automatically by the embroidery machine controller if the valve 7 which is preferably an electromagnet valve is opened the compressed air 39 flows via the corresponding compressed air hose 29 to reach the injector nozzle 6 as can be seen from fig3 each injector nozzle 6 comprises one nozzle base body 26 this base body 26 has two bores of different diameter located on the same axis a blower tube 24 is located in the bore having the larger diameter its blower opening 24a is movable by means of the drive mechanism 9 to alignment.