Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 151-156.doi: 10.13475/j.fzxb.20180702506

• Machinery & Accessories • Previous Articles     Next Articles

Influence of interval distance of double-needle bed warp-knitting machine on yarn demand

XU Yunlong, XIA Fenglin()   

  1. Engineering Research Center for Knitting Technology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2018-07-10 Revised:2019-03-29 Online:2019-08-15 Published:2019-08-16
  • Contact: XIA Fenglin E-mail:xiafl_622@163.com

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Abstract:

In order to solve the yarn fluctuation caused by the interval distance of the double-needle bed warp-knitting machine, the intrinsic correlation of interval distance and the fluctuation of the yarn demand was analyzed. The displacement curves of the knitting needles and the guide needles in the process of forming a double-needle bed warp-knitting machine were tracked by using the KEYENCE VW-6000 dynamic analysis three-dimensional microscope system, the collocation of guide needle and knitting needles was analyzed, and the whole yarn demand fluctuation in the knitting area of the warp-knitting machine was calculated. A geometrical model of the coil parts in the process of the front needle bed knitting loop-forming was established. The function relation between the swing amplitude of guide bar and knocking-over bar was deduced. Then, the linear relation model between the integral yarn-demand fluctuation of the double-needle bed warp-knitting machine and the spacing of the knocking-over bar was obtained. Finally, a kind of movable rod tension bar with double compensation capability was designed, which can effectively reduce the yarn fluctuation during knitting.

Key words: double-needle bed warp-knitting machine, interval distance, yarn-demand, mathematical model, three-dimensional microscope system

CLC Number: 

  • TS184

Fig.1

Displacement curve of loop-forming parts"

Fig.2

Schematic diagram of movement of parts. (a) All crossed knitting needle;(b) Partly crossed knitting needle"

Tab.1

Knitting action of front needle bed and related feature"

角度域/(°) 运动状态
0~30 梳栉后摆,针床上升
30~60 梳栉前摆至原点上方
69~90 梳栉前摆,针前垫纱
90~120 梳栉后摆至原点上方
120~150 梳栉后摆,前针床成圈
150~180 梳栉前摆至原点上方

Fig.3

Yarn demand of spacer layer"

Tab.2

Requirement of yarn in typical position of different spacing"

主轴角度/(°) 需沙量/mm
L1 L2 L3 L4 L5
0 19.05 19.23 19.53 19.92 20.43
30 22.30 22.30 22.30 22.30 22.30
60 19.05 19.23 19.53 19.92 20.43
90 24.00 26.00 28.10 30.00 32.80
120 20.73 22.90 25.52 28.47 31.70
150 30.58 34.3 38.62 43.20 48.26
180 26.00 29.20 32.53 35.90 39.43
210 29.30 32.27 35.3 38.28 41.30
240 26.00 29.20 32.53 35.90 39.43
270 31.00 35.97 41.10 45.98 51.80
300 27.73 32.87 38.52 44.45 50.70
330 37.58 44.27 51.62 59.18 67.26
360 33.00 39.17 45.53 51.88 58.43

Fig.4

Maximum fluctuation of yarn demand in loop-forming region"

Fig.5

Guide-bar swing and path of yarn. (a) Yarn path; (b) Yarn path with guide-bar swinging"

Fig.6

Overall fluctuation demand of yarn demand"

Fig.7

Tension rod of spring piece(a) and principle of compensation (b)"

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