Material-saving weft cutting device for rapier loom

Abstract

The invention discloses a material-saving weft cutting device for a rapier loom. The device comprises an upper scissors assembly, a lower scissors assembly, a transmission mechanism and a weft crimping mechanism connected with the lower scissors assembly, wherein the upper scissors assembly and the lower scissors assembly are connected to the transmission mechanism respectively; the transmission mechanism comprises a cam which is used for pushing the upper scissors assembly to actuate; the weft crimping mechanism comprises a weft pressing wheel, a driven wheel which is coaxial with the weft pressing wheel and a driving wheel which drives the driven wheel to rotate; and the weft pressing wheel is contacted with a horizontal extension section of the lower scissors assembly and unidirectionally rotates to coil wefts. The wefts which enter a scissors mouth of the weft cutting device are coiled and compacted through the unidirectional rotation of the weft pressing wheel so as to replace the effect achieved by waste edge warps which are originally used for clamping the wefts; and the weft pressing wheel can press single wefts, and can also sequentially crimp multiple wefts under the condition that the multiple wefts are not wound.

Description

technical field [0001] The invention relates to a textile machine, in particular to a weft cutting device of a rapier loom, which comprises an upper scissors assembly, a lower scissors assembly and a transmission mechanism; the upper scissors assembly and the lower scissors assembly are respectively connected to the transmission mechanism ; The transmission mechanism includes a cam that pushes the action of the upper scissors assembly. Background technique [0002] The rapier loom weaves the weft and warp together through the weft feeding sword and the weft receiving sword. In the process of weaving, in order to make the weft thread have enough tension when beating up, and prevent the defective fabric from being caused by the elastic retraction of the weft thread, warp and edge threads are often set on both sides of the cloth body, generally 12-16, and many even require 30 pieces, play the role of clamping the weft thread at this place. The two ends of the weft are clamped...

AI Technical Summary

Problems solved by technology

This method is a way to save materials, but there are also two unsolvable shortcomings: 1. When there are more than two wefts, the inhaled wefts will be lost due to the action of the vortex of the airflow. It will be entangled and knotted together. If the weft feeding mechanism sends one of the weft threads into the weaving area at this time, it will bring out the other one or several weft threads at the same time, resulting in failure and resulting in defective cloth.

2. Due to the use of negative pressure suction fan, it is necessary to use additional power to drive the continuous operation of the negative pressure suction fan, which itself also produces a waste of electricity. Often the power of this negative pressure suction fan is not small, generally small It is also around 100W. If it continues to run, the electricity bill consumed 24 hours a day may be much higher than the material cost saved.

This non-waste side yarn device is installed together with the rapier loom during use, and the original waste side warp yarn at the waste side part of the fabric on both sides is replaced by the warp yarn substitute thread, and recycled, avoiding to a certain extent The waste of warp yarn can be used for multi-weft weaving, which reduces the production cost, but because it uses warp yarn substitute thread to replace the waste edge warp yarn, it needs complicated spinning and separating mechanism, and it is not very convenient to install and use

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