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Autex Research Journal

The Journal of Association of Universities for Textiles (AUTEX)

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Kinematic Comparison of a Heald Frame Driven by a Rotary Dobby with a Cam-Slider, a Cam-Link and a Null Modulator

Honghuan Yin
  • School of Mechanical Engineering, Tianjin Polytechnic University, No. 399, Binshuixi Road, Xiqing District, Tianjin 300387, China
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/ Hongbin Yu
  • Corresponding author
  • School of Mechanical Engineering, Tianjin Polytechnic University, No. 399, Binshuixi Road, Xiqing District, Tianjin 300387, China
  • Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin Polytechnic University, No. 399, Binshuixi Road, Xiqing District, Tianjin 300387, China
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/ Lei Wang
  • School of Mechanical Engineering, Tianjin University, No. 92, Weijin Road, Nankai District, Tianjin 300072, China
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Published Online: 2020-01-07 | DOI: https://doi.org/10.2478/aut-2019-0068


The kinematics of the heald frame of a rotary dobby with two different modulator types are analyzed and compared. Kinematic mathematical models of the modulator main shaft, cam unit, and heald frame driven by the rotary dobby with a cam-slider modulator and a cam-link modulator were constructed based on two different cam contours derived from measured points on the conjugate cams of the two modulators. The motion characteristics of the two modulators and a null modulator, the cam unit, and the motion transmission unit are analyzed. The purpose of the present study was to establish the kinematic models, investigate the motion characteristics, and analyze their differences. At the same time, a calculation method for each motion transmission process was established and numerical models were developed. The results demonstrated that the two different modulators produce almost the same heald frame motion characteristics. Despite that both modulator types can be adapted to the requirements of a loom, the cam-link modulator can produce a more stable and reliable motion.

Keywords: Rotary dobby; kinematic comparison; cam-slider modulator; cam-link modulator; heald frame


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About the article

Published Online: 2020-01-07

Citation Information: Autex Research Journal, ISSN (Online) 2300-0929, DOI: https://doi.org/10.2478/aut-2019-0068.

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© 2019 Honghuan Yin et al., published by Sciendo. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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