Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 162-169.doi: 10.13475/j.fzxb.20200705308

• Machinery & Accessories • Previous Articles     Next Articles

Control technology for spandex yarn delivery in weft knitting

PENG Laihu1, LUO Chang1, NIU Chong2(), LÜ Yongfa3, HU Xudong1, DAI Ning1   

  1. 1. Key Laboratory of Modern Textile Machinery & Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Hangzhou Xuren Automation Co., Ltd., Hangzhou, Zhejiang 310018, China
    3. Zhejiang Rifa Textile Machinery Technology Co., Ltd., Xinchang, Zhejiang 312500, China
  • Received:2020-07-21 Revised:2020-12-11 Online:2021-04-15 Published:2021-04-20
  • Contact: NIU Chong E-mail:614519168@qq.com

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Abstract:

The amount of spandex yarn delivery is difficult to adjust and control in weft knitting process because of its low modulus, high elasticity and high recovery rate. The fast response positive yarn feeder was used as the drive for yarn delivery. Analog control signal output was achieved using the pulse width modulation (PWM) with adjustable duty cycle. The high performance advanced RISC machines (ARM) processor was used as the control core, and the position and speed double closed loop mode was adopted. The real-time controller of the spandex yarn was designed to achieve the dynamic adjustment and constant tension delivery. The process requirements of spandex delivery were studied, and hardware design and software development of the yarn feeding controller were addressed. The synchronization scheme between the yarn dilivery controller and the whole machine control system was made. The experimental results show that the weft knitted fabrics produced with the new control scheme is even and tidy in circle, without dark stripes and with good elasticity, which verifies the feasibility of the spandex delivery control scheme.

Key words: positive yarn feeding, constant tension, spandex yarn, weft knitting, yarn dilivery control technology

CLC Number: 

  • TS103.7

Fig.1

Spandex yarn dilivery process diagram"

Fig.2

Spandex yarn dilivery control technical solutions"

Fig.3

Syringe (a) and yarn delivery drive roller (b) schematic"

Fig.4

Stress-strain curve of spandex yarn"

Fig.5

System hardware circuit overall block diagram"

Fig.6

Schematic diagram of machine needle encode and zero signal detection"

Fig.7

Encoder and zero pulse acquisition circuit"

Fig.8

PWM voltage regulation output analog control signal"

Fig.9

Schematic diagram of human-computer interaction with driver"

Fig.10

Spandex yarn dilivery regulation flow chart"

Fig.11

Spandex yarn dilivery gradient adjustment process"

Fig.12

PWM voltage regulation output front and rear waveforms. (a) Front-end PWM output; (b) Back-end PWM output"

Fig.13

Fabric loop parameter measurement diagram. (a) Fabric front loop;(b) Fabric reverse loop"

Tab.1

Measurement data of fabric sample loop parameters"

试样编号 圈距/μm 圈高/μm 标准差/μm
1 388.36 516.04 5.01
2 385.89 523.28 4.23
3 388.31 516.07 3.81
4 385.83 513.63 5.22
5 381.01 528.11 3.25
6 388.31 525.69 5.49
7 390.65 522.45 6.02
8 393.06 511.49 4.91
9 381.00 523.76 3.89
10 388.33 519.28 5.11
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