The influence on the motion characteristics of the heald frame from cam profile error in a modulator

Abstract

This study provides a comprehensive analysis of the dobby heald lifting mechanism's role in the textile weaving process. It specifically focuses on motion control methods aimed at improving yarn tension and fabric quality. The study proposes an optimized heald frame motion law to address the negative impact of heald movement on warp tension and yarn breakage rate. By utilizing a reverse modeling approach, the study uncovers the intricate relationship between the lifting mechanism's components and their contribution to achieving precise lifting. This approach involves finding cam profile solutions based on theoretical heald frame motion. Mathematical models are then used to establish correlations between heald frame motion and cam profile coordinates, enabling machine optimization. In order to assess the influence of errors in cam profiles on heald frame motion, simulations are conducted using the Monte Carlo method. The study concludes that both systematic and random errors have a significant impact on heald frame movement, which in turn affects machine performance and weaving quality. By conducting a comparative analysis, the study provides guidance on minimizing errors in cam design, thus enhancing the precision of the heald frame. This research contributes to the field of textile machinery design and manufacturing.