SU632773A1 - Method of feeding weft thread on pneumatic loom - Google Patents

Description

  The invention relates to the textile industry and can be used to feed the weft yarn on pneumatic weaving machines. A known method of feeding weft threads on a pneumatic weaving machine involves pulling the measured portions of the weft thread through a nitate resident and laying them. By air stream in the confusing channel, implemented in a device for continuously measuring the weft thread of the required length G | . The disadvantage of the known method is that the length of the measured portion of the weft yarn is not controlled, which significantly reduces the quality of the fabric during yarn failures and increases the waste of the weft yarn when trimming it in the event of overflight of the fabric edge. The aim of the invention is to improve the quality of the fabric by increasing the accuracy of measuring the weft yarn sections. This is achieved by using the proposed method to measure the frequency of cases in which the lengths of the sections of the laid weft threads exceed. the threshold length, and change the tension of the weft yarn at the exit of the nitenate resident according to the result of comparing the frequency of cases with the gadan value of the probability integral exceeding the threshold length. The drawing shows a block diagram of a device for feeding the weft yarn. The diagram shows the weft package 1, weft thread 2, electromagnetic nitenate resident 3, metering drum 4, nozzle 5, confusing channel 6, photoelectric sensor 7, suction tube 8, case frequency measurement unit 9, probability input unit 10, unit 11 comparison, thread conductors 12. The device operates as follows. The weft thread 2 is continuously unwound from the fixed package 1, passes between the plates of the electromagnetic nitenate resident 3 through the system of thread conductors 12 and is placed in a helical groove on the surface continuously, and the pressure drum 4 is blown into it. I measure the thread from the surface