Yarn tension detector and weft tension detecting device of injection weaving machine

Abstract

The invention relates to a yarn tension detector and a weft tension detecting device of a jet loom. The yarn tension detector is provided with a yarn guiding part, a first plate part, a second plate part and a strain detection element. The yarn guiding part guides the yarns along the yarn guiding direction. The first plate part and the second plate part support the yarn guiding part. The strain detection element detects the strain of the first plate part or the strain of the second plate part. The first plate part and the second plate part are connected and fixed on the yarn guiding part. Thefirst plate part and the second plate part are mutually and oppositely arranged and configured mutually in parallel.

Description

technical field [0001] The present invention relates to a yarn tension detector with a strain detection element, and a weft yarn tension detection device for a jet loom. Background technique [0002] Yarn tension detectors are disclosed in JP-A-1-92451 and JP-A-2002-543297. The yarn tension detector disclosed in the above publication is called a three-point tension detector having three rods, and the rod arranged in the center of the three rods functions as a tension measuring element for detecting the tension of the yarn (yarn tension). Grooves are formed on each rod, and the yarn passes through the groove while always in contact with each rod in each groove. The yarn is bent by being guided by contacting the three rods, and the load applied to the central rod due to the bending is detected as the yarn tension. [0003] JP-A-6-229855 discloses a yarn sensor. The yarn sensor includes a leaf spring having a yarn guide hole, and an elongation detection sensor element made o...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the energy for transferring the yarn, that is, the air flow rate for inserting the weft yarn in the air-jet loom is greatly increased, and the yarn is easily broken.

In addition, in the transfer (weft insertion) of the spun yarn, the state of fluff on the surface of the yarn changes due to the above-mentioned slip joint, and there is a problem that the quality of the fabric deteriorates.

[0005] The above-mentioned yarn sensor disclosed in JP-A-6-229855 can detect the change of the yarn tension in the structure of the sensor element, but there is a problem that the yarn tension cannot be measured.

In addition, the above-mentioned yarn sensor outputs a value corresponding to the deflection of the leaf spring, so even if the magnitude of the yarn tension is the same, if the passing position of the yarn in the yarn guide hole is different, the amount of deflection of the leaf spring will vary. different, so the output value is different

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