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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, Hongbin Yu, Lei Wang

Autex Research Journal

2021

Vol. 21, no. 3

323--332

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.

Comparison of Heald Frame Motion Generated by Rotary Dobby and Crank & Cam Shedding Motions

Eren R., Özkan G., Karahan M.

Fibres & Textiles in Eastern Europe

2005

Vol. 13, no. 4 (52)

78--83

Mechanism models are introduced for rotary dobby, crank & cam shedding motions. Equations governing heald frame motion are derived. Heald frame motion curves are obtained and compared with each other. It is shown that higher heald frame maximum velocity & maximum acceleration, as well as a longer approximate heald frame dwell, are generated by the rotary dobby rather than the crank or cam shedding motions, due to the intermittent nature of the rotary dobby shaft’s motion.

Opracowano modele mechanizmu napędu nicielnic, napędzanych przez mechanizm rotacyjny, korbowy i krzywkowy. Uzyskano wykresy ruchu nicielnic w funkcji czasu i porównano je między sobą. Wykazano, że większe maksimum prędkości i przyspieszenia nicielnic, jak również dłuższe przerwy sterowania nicielnic, występują raczej przy rotacyjnym ruchu nicielnic, niż przy korbowym lub krzywkowym napędzie. Wynika to głównie z przerywanego ruchu wału mechanizmu nicielnicowego.