Nozzle control device with closed loop control circuit for an air weaving loom

摘要

PCT No. PCT/EP89/00617 Sec. 371 Date Jan. 31, 1990 Sec. 102(e) Date Jan. 31, 1990 PCT Filed Jun. 1, 1989 PCT Pub. No. WO89/12122 PCT Pub. Date Dec. 14, 1989.A nozzle control device for an air weaving loom has a weft thread insertion by one or more main nozzles and a feed advance of the yarn in the air insertion channel by relay nozzles arranged one behind the other at the weaving reed. The relay nozzles are controlled in groups and in sequence in an impulse type manner in such a way that the thread tip zone is seized by the air stream and the thread is pulled through the air insertion channel. The control of the relay nozzles of an air weaving machine is accomplished in such a way that in sequential work steps substantially different types of yarns can be woven with a high quality. For this purpose the durations of air impulses supplied to the relay nozzles arranged in groups, are controlled as a function of yarn specific values modified by a currently measured air effectiveness of the respective yarn being processed.