Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (06): 153-160.doi: 10.13475/j.fzxb.20190706708

• Machinery & Accessories • Previous Articles     Next Articles

Improvement scheme and practice of weft-straightening machine

LIU Jianbao1, LI Ping1,2(), JIN Fujiang3, MEI Xiaohua1,2   

  1. 1. College of Information Science and Engineering, Huaqiao University, Xiamen, Fujian 361021, China
    2. Fujian Engineering Research Center of Motor Control and System Optimal Schedule, Xiamen, Fujian 361021, China
    3. College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, Fujian 361021, China
  • Received:2019-07-26 Revised:2019-11-20 Online:2020-06-15 Published:2020-06-28
  • Contact: LI Ping E-mail:pingping_1213@126.com

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Abstract:

The existing weft-straightening machine for woven fabrics has poor corrective effect on common types of weft skewness such as double bow and double hook, and computation for readjustment of rotating speed is complex for the weft-straightening machine. Accordingly, an improved scheme of weft-straightening machine was designed and experimented. Firstly, an improved structure of multi-roll weft straightener was proposed after analyzing the principle of weft straightening of roller weft straightener. The equation was used to simulate the common weft skew types, and the initial weft shape was obtained for calculating the weft slope of the fabric before weft correction. Eight points on the weft was used to describe the weft slope, and the simulation database of weft skew detection was thus established. Finally, a method was designed to obtain the adjustments of each weft roll by using the least square method based on the detected weft inclination data, reducing the computational complexity and enabling the calculation of the weft slope after weft rectification according to the final orientation of the weft. Experimental results show that the effect of weft-straightening machine is improved by readjusting the weft straightener, leading to a 100% first-class fabric qualification rate for different types of weft skew problems.

Key words: fabric weft skewness, weft-straightening machine, data simulation, data interpolation, least squares method

CLC Number: 

  • TS195.3

Fig.1

Camera weft-straightening diagram"

Fig.2

Fabric image collection"

Fig.3

Weft processing based on camera weft-straightening"

Fig.4

Relationship between straight roll angle and adjustment amount"

Fig.5

Relationship between bending angle and adjustment amount"

Fig.6

Correction of weft deformation. (a) Correction for weft skew only; (b) Correction for weft bend only; (c) Correction with both weft skew and weft bend"

Fig.7

Double bow weft and double reverse bow weft"

Fig.8

Left bending roll and right bending roll"

Fig.9

Improved structure of weft-straightening"

Fig.10

Several weft patterns in national standards"

Tab.1

Cubic spline interpolation result"

纬纱形态 最大值 平均值 标准差
斜纬 0.062 2 0.014 4 0.011 0
单弓纬 0.068 6 0.017 6 0.012 5
双弓纬 0.816 3 0.113 4 0.140 4
双反弓纬 1.084 2 0.108 0 0.186 6
钩弓 0.907 0 0.137 5 0.169 2
双钩弓纬 1.030 5 0.230 3 0.167 8

Tab.2

Results after using different interpolation methods"

纬纱形态 最大值 平均值 标准差
斜纬 0.024 6 0.005 4 0.004 1
单弓纬 0.052 3 0.010 5 0.008 4
双弓纬 0.258 6 0.029 5 0.040 8
双反弓纬 0.187 9 0.025 0 0.031 3
钩弓 0.230 9 0.031 6 0.035 5
双钩弓纬 0.247 7 0.047 9 0.042 1

Tab.3

Result before improved latitude"

纬纱
形态		 最大
值		 平均
值		 标准
差		 优等
品/%		 一等
品/%		 二等
品/%
斜纬 0.024 2 0.005 1 0.004 0 100 100 100
单弓纬 0.049 0 0.009 9 0.008 2 100 100 100
双弓纬 0.402 0 0.051 5 0.053 5 88 98 100
双反弓纬 0.532 7 0.064 4 0.054 7 89 94 99
钩弓 0.324 8 0.049 6 0.047 5 98 100 100
双钩弓纬 0.453 5 0.083 9 0.073 2 74 94 100

Tab.4

Result after improved latitude"

纬纱
形态		 最大
值		 平均
值		 标准
差		 优等
品/%		 一等
品/%		 二等
品/%
斜纬 0.023 7 0.005 3 0.004 0 100 100 100
单弓纬 0.047 5 0.010 1 0.008 2 100 100 100
双弓纬 0.316 4 0.033 8 0.044 7 95 100 100
双反弓纬 0.303 4 0.033 0 0.038 3 99 100 100
钩弓 0.249 3 0.033 0 0.037 4 100 100 100
双钩弓纬 0.349 0 0.050 9 0.050 8 91 100 100
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