Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (09): 173-179.doi: 10.13475/j.fzxb.20180900907

• Machinery & Accessories • Previous Articles     Next Articles

Parameter characteristics of weft insertion mechanism of rapier loom capable of simply adjusting reed width

ZHOU Xiangqin1,2(), GU Yeqin1, WU Zhenyu1   

  1. 1. The Research Center of Modern Textile Machinery Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Wanli Textile Machinery Research Institute, Hangzhou, Zhejiang 311243, China
  • Received:2018-09-03 Revised:2019-03-12 Online:2019-09-15 Published:2019-09-23

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Abstract:

In order to simplify the adjustment process of cloth width in rapier loom, a new design criterion for weft insertion mechanism was proposed by researching the relationship between the rapier position and actions of assistant devices, which means the weft insertion mechanism should be designed with unchanged rapier displacement outside of the shed (assistant displacement) and unchanged rapier position where weft is handed over during the process of adjusting reed width. Based on vector analysis method, the motion equations of a weft insertion mechanism containing a spatial linkage and a planer linkage were derived, and the rapier motion curve was obtained. The influences on rapier motion curve were discussed from sub mechanisms. The result shows that certain weft insertion mechanism exists, and when its original position satisfies a certain condition, regardless of the changes in cloth width, the assistant displacement of rapier stays unchanged. When the guider of point used for adjusting the reed width meets a certain condition, the rapier position where weft is handed over keeps in the same site.

Key words: rapier loom, weft insertion mechanism, cloth width, parameter characteristic

CLC Number: 

  • TH112.1

Fig.1

Weft insertion process. (a) Process of rapier motion; (b) Relative position between dust collector and rapier; (c) Relative position between releasing bar and rapier; (d) Relationship between cloth width and motion process of rapier"

Fig.2

Motion curve of rapier"

Fig.3

Spatial linkage used for weft insertion in rapier loom"

Fig.4

Schematic view of weft insertion mechanism"

Fig.5

Analysis schematic view of adjusting mechanism for weft insertion. (a) The first location of adjusting mechanism for weft insertion; (b) The second location of adjusting mechanism for weft insertion"

Tab.1

Parameters of mechanism"

参数量符号 参数数值 参数量符号 参数数值
γ/(°) 33.000 l1/mm 110.000
δ/(°) 57.000 l2/mm 155.000
η/(°) 41.020 l3/mm 140.000
ε/(°) 168.085 l4/mm 155.000
r/mm 186.175 i 5.500

Fig.6

Composition of rapier motion curve"

Tab.2

Parameters of mechanism"

参数量符号 参数数值 参数量符号 参数数值
γ/(°) 28.000 l1/mm 150.000
δ/(°) 120.000 l2/mm 245.000
η/(°) -9.808 l3/mm 108.000
175.400
ε/(°) 226.755 l4/mm 354.000
r/(°) 186.179 i 4.862

Fig.7

Example of adjustment mechanism for weft insertion"

Fig.8

Rapier curve with unchanged rapier assistantdisplacement. (a) Curve of rapier displacement;(b) Curve of rapier velocity; (c) Curve of rapier acceleration"

Fig.9

3-D Model of application case"

Fig.10

Physical display of application case"

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