Shedding mechanism (heald frame movement rules)
From the perspective of shed geometry, the warp tension is small when the heddle is flat and high when it is fully open. In order to improve the adverse effect of heald frame relaxation on warp tension, the relaxation law of heald frame should be that the speed is high when the heald is flat and the speed is low when it is close to full opening; at the moment when the opening ends and the closing begins, the acceleration of the warp is completely small, and the rest of the time The internal acceleration changes moderately. In this way, the warp yarns are relaxed smoothly, the tension fluctuation is small, the heald frame vibration is small, and the breakage rate can also be reduced accordingly. Commonly used heald frame relaxation laws include simple harmonic relaxation law, elliptical ratio relaxation law and sinusoidal acceleration relaxation law. Theoretically speaking, the acceleration of simple harmonic leisure at the end of opening or the beginning of closing is very large, the impact on the heald frame is great, and the acceleration change of elliptical leisure is larger during the leisure process. Both of them are not suitable for high speed, while the sinusoidal acceleration leisure is It is superior to the above two types of leisure, and the speed and acceleration curves meet the requirements of the heald frame. However, due to the high manufacturing accuracy of the cam for sinusoidal acceleration leisure, when the cam is not accurately manufactured, the actual heald frame vibration is greater than that of the simple harmonic leisure. As for the elliptical ratio, when the ratio of the long and short axes reaches 3:2, similar disadvantages also exist. Therefore, considering the simple and harmonious leisure finishing, convenience and high accuracy, it is also widely adopted on high-speed looms.
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