Improvement scheme and practice of weft-straightening machine

The existing weft-straightening machine for woven fabrics has poor corrective effect on common types of weft skewness such as double bow and double hook, and computation for readjustment of rotating speed is complex for the weft-straightening machine. Accordingly, an improved scheme of weft-straightening machine was designed and experimented. Firstly, an improved structure of multi-roll weft straightener was proposed after analyzing the principle of weft straightening of roller weft straightener. The equation was used to simulate the common weft skew types, and the initial weft shape was obtained for calculating the weft slope of the fabric before weft correction. Eight points on the weft was used to describe the weft slope, and the simulation database of weft skew detection was thus established. Finally, a method was designed to obtain the adjustments of each weft roll by using the least square method based on the detected weft inclination data, reducing the computational complexity and enabling the calculation of the weft slope after weft rectification according to the final orientation of the weft. Experimental results show that the effect of weft-straightening machine is improved by readjusting the weft straightener, leading to a 100% first-class fabric qualification rate for different types of weft skew problems. Copyright No content may be reproduced or abridged without authorization.