Linkage Driven Dobby with Dwell

Guha, Anirban; Amarnath, C.; Issac, K. Kurien; Talukdar, Mayukh; Joshi, Sanjog V.

doi:10.1177/0040517507087673

Cited by 5 publications

(2 citation statements)

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“…At present, the dobby development technology is focused toward higher speed, higher effi ciency, and easier control and operation [16][17][18]. Conjugate cams are also used in most rotation transmission mechanisms of rotary dobby lifting mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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

Yin

Wang

2021

Autex Research Journal

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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.

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Section: Introductionmentioning

confidence: 99%

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

Yin

Wang

2021

Autex Research Journal

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“…The rotary dobby is the most advanced high-speed shedding device at present [1][2][3]. Its function is to form a passage where the weft can get through by dividing the warp yarns into two layers according to certain rules.…”

Section: Introductionmentioning

confidence: 99%

Dynamics Analysis of the Rigid‐Flexible Coupling Lifting Comprehensive Mechanism for a Rotary Dobby

Wei

Jin

Zhan

et al. 2019

Mathematical Problems in Engineering

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This paper addresses the problem of dynamics analysis of the rigid-flexible coupling lifting comprehensive mechanism for a rotary dobby, which is the important part of the loom. To provide a physical model basis for a precise dynamics model, the finite element method was used to discretize the bending arm of the rotary dobby effectively. Combining with the modal synthesis techniques, the dynamic model of the bending arm was established by using Kane’s formulation, and it laid a foundation for analyzing the dynamic performance of the heald frame. By comparing virtual prototype simulation results with the numerical calculation results of the bending arm, the correctness of this model was verified. Based on the established dynamic model, the modal truncation method is used to simplify the dynamic model; in addition, the influence of parameters such as the speed of the dobby, the warp tension, the movement distance of the heald frame, and the thickness of the bending arm on the dynamic characteristics of the heald frame was analyzed. Last, the sensitivity analysis (SA) method is used to analyze the effects of each parameter. The results show that it is appropriate to select the first four modes to calculate, and increasing the speed greatly or increasing the warp tension, the shedding performance is obviously worse, while the shedding performance of the loom can be optimized by reducing the shedding range or increasing the thickness of the bending arm.

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