A mechanical drafting device for an air-jet loom

Abstract

The invention discloses a mechanical drafting device of an air jet loom. The mechanical drafting device comprises a loom frame, and the loom frame is provided with a beating-up mechanism, a yarn gripping mechanism and a driving mechanism. The beating-up mechanism comprises a beating-up shaft, a beating-up support arm, a batten and a reed. The yarn gripping mechanism comprises a yarn gripper and swing rods, wherein the yarn gripper comprises a yarn gripping base and a plurality of yarn gripping pieces arranged on a yarn gripping seat and uniformly distributed; the yarn gripping seat is arranged on the reed, the relative positions of the yarn gripping pieces are provided with yarn guide holes, the yarn guide holes rightly face weft guide reed slots of the reed, a yarn gripping slot is fittingly formed between every two adjacent yarn gripping pieces, the number of the swing rods is equal to that of the yarn gripping slots, the heads of the swing rods penetrate into the yarn gripping slots, the tails of the swing rods are fixedly arranged on swing rod shafts, the swing rod shafts are hinged to a swing rod support, the swing rod support is arranged on the yarn gripping seat, the swing rod shafts are connected with the driving mechanism via a connecting rod mechanism, and the swing rods can swing up and down under drive of the reed and the swing rod shafts. The mechanical drafting device is capable of instantly gripping yarns at high speed, and looped wefts are avoided.

Description

technical field [0001] The invention belongs to the field of textile machinery, in particular to a mechanical drafting device for an air-jet loom. Background technique [0002] Stretch yarn is mainly elastic and belongs to a kind of textured yarn. Its characteristic is that the yarn can spring back quickly after being stretched. When the loom is weaving the elastic yarn weft, due to the high elasticity of the elastic yarn, weft shrinkage is prone to occur at the right side of the selvage. Therefore, in order to avoid the rebound of the weft yarn at the end of weft insertion, a drafting force is required to straighten it, and when the drafting force cannot reach the force required by the elastic yarn, weft shrinkage is prone to occur. The existing solution is to install a drafting nozzle at the end of the weft insertion of the loom. The drafting nozzle is provided with an air source by an independent air bag, and a larger air pressure is used to give a drafting force to the ...

AI Technical Summary

Problems solved by technology

The existing solution is to install a drafting nozzle at the end of the weft insertion of the loom. The drafting nozzle is provided with an air source by an independent air bag, and a larger air pressure is used to give a drafting force to the flying weft yarn to ensure that the weft yarn It can straighten smoothly and prevent weft shrinkage. This method requires a lot of drafting air pressure, which is a serious waste of air. In addition, this process requires a special solenoid valve and drafting air bag to control the air pressure, which increases the cost, especially for Energy-saving air jets are not suitable for independent air supply looms

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