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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

Kinematic Comparison of a Heald Frame Driven by A Rotary Dobby with A Cam-Slider, A Cam-Link and... AbstractThe 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Autex Research Journal de Gruyter

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

Autex Research Journal , Volume 21 (3): 10 – Jul 1, 2021

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Publisher
de Gruyter
Copyright
© 2021 Honghuan Yin et al., published by Sciendo
ISSN
2300-0929
eISSN
2300-0929
DOI
10.2478/aut-2019-0068
Publisher site
See Article on Publisher Site

Abstract

AbstractThe 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.

Journal

Autex Research Journalde Gruyter

Published: Jul 1, 2021

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

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