A positive tension compensation device for warp knitting

Abstract

The invention discloses a positive tension compensating device for tricot knitting and belongs to the field of tricot knitting tension adjustment. According to the device, bearing supports are arranged on a machine rack, a shaft is arranged on the bearing supports in a sleeved mode, a steel plate is arranged on the shaft, a rigid tension rod is connected with the shaft through the steel plate, a coupler is arranged at one end of the shaft, and a voice coil motor is connected with shaft through the coupler; the voice coil motor is connected with a controller; the controller is connected with a main shaft of a tricot machine, and a yarn tension test system is connected with an encoder which is connected with the controller. According to the positive tension compensating device, firstly, the warp tension fluctuation is measured through a resistance strain type yarn tension meter, then based on the primary crest position and the crest peak amplitude in a yarn tension measuring result, the rotation of the voice coil motor is adjusted through the controller so as to change the size of the bobbing angular displacement theta of the rigid tension rod, the crest is reduced, so that the size of the yarn tension is changed uniformly, accordingly, the warp yarn compensation amount is changed, and the positive compensation of the warp yarn tension is achieved.

Description

technical field [0001] The invention relates to a warp knitting positive tension compensation device, which belongs to the field of warp knitting tension adjustment. Background technique [0002] In the process of warp knitting, due to the difference between the amount of yarn consumption and the amount of yarn feeding during knitting, the tension of the warp yarn will fluctuate. Excessive tension fluctuations will easily cause yarn breakage and uneven coils, affecting product quality and production efficiency. . [0003] The current tension compensation device generally consists of a tension element and a tension rod. One end of the tension element is fixed on the frame through a connecting piece, and the other end is fixed to the tension rod. The warp tension is compensated by the elasticity and elastic recovery performance of the tension element. It is also reported that by changing the length of the tension piece, and then changing the working torque of the compensation...

AI Technical Summary

Problems solved by technology

However, these tension compensation methods have a phenomenon of compensation lag in a loop forming process, that is, negative tension compensation

[0004] Negative tension compensation has a certain tension compensation ability to a certain extent, but it makes the warp tension fluctuate, resulting in uneven yarn tension, forming a large warp tension peak ( figure 1 is a typical peak), there is still the problem of tension compensation hysteresis, which cannot meet the requirements of some yarns with low strength and insufficient performance, such as spun yarns

[0005] At present, no positive tension compensation device has been found, and it is necessary to develop a warp knitted positive tension compensation device to overcome these defects in the negative tension compensation

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