Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (09): 21-26.doi: 10.13475/j.fzxb.20220400606

• Invited Column: Textile Intelligent Manufacturing and Robotics • Previous Articles     Next Articles

Key technology for yarn automatic splicer

MAO Huimin, SUN Lei, TU Jiajia, SHI Weimin()   

  1. The Center for Engineering Technology of Modern Textile Machinery & Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2022-04-01 Revised:2022-05-12 Online:2022-09-15 Published:2022-09-26
  • Contact: SHI Weimin E-mail:swm@zstu.edu.cn

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Abstract:

The existing splicing devices in knitting workshops are only applicable to some limited yarn types and it is difficult to splice automatically on the yarn frame. This research simulated the manual knotting process and designed a small mechanical splicer consisting of negative pressure thread suction, thread pressing, tensioning, mechanical knotting and thread picking mechanism. In parallel to the analysis of construction and motion principle of the knotting and thread picking mechanisms, the knotting method and process were simulated and analyzed, leading to the development of a prototype for experimental testing. The experimental results show that the mechanical splicer can simulate the manual knotting by using the interplay between the knotting mechanism and the thread picking mechanism to draw and join two yarns together, and the success rate of knotting is higher than 99%, and it is structurally compact and applicable for wide range yarn types.

Key words: automatic splicing, mechanical knotting, knotting mechanism, thread picking mechanism, yarn splicing, smart manufacturing

CLC Number: 

  • TS103.7

Fig.1

Principle of yarn splicing"

Fig.2

Diagram of splicer"

Fig.3

Knotting knife parts structure diagram"

Fig.4

Knotting knife profile curve(a) and knotting knife guide groove trajectory curve(b)"

Fig.5

Schematic diagram of structure of thread picking components"

Fig.6

Sketch of thread picking convex contour line (a) and thread picking mechanism(b)"

Fig.7

Schematic diagram of thread suction mechanism"

Fig.8

Simulation results of different nozzle shapes. (a) Squareness; (b) Oval; (c) Roundness"

Fig.9

Simulation results for different inner diameter nozzles. (a) Inner diameter is 6 mm; (b) Inner diameter is 16 mm"

Fig.10

Thread pressing mechanism diagram"

Fig.11

Sketch of transmission mechanism"

Fig.12

Knotting knife knotting process diagram. (a) Rotates 90°; (b) Rotates 270°; (c) Rotates 360°; (d) Rotates 540°"

Fig.13

Yarn knotting process. (a) Experiment platform; (b) Knotting knife rotates 270°; (c) Knotting knife rotates 540°; (d) Knotting knife rotates 720°"

Fig.14

Results of different yarn splicing. (a) Same yarn splicing results 1; (b) Same yarn splicing results 2; (c) Results of different types of yarn splicing"

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