运用数值逼近法改进飞梭刺绣机布框运动规律

介绍了采用伺服电机及微机技术改造老式大型飞梭刺绣机纯机械传动方式的设计与实现。用伺服电机取代原机械头驱动飞梭机布框。采用测绘凸轮获得的基本轮廓线数据,再用数值方法中的差分法和三次样条函数数值逼近法,逼真模拟原机的运行曲线,并将曲线数据变换成伺服电机的步进时间间隔,由控制程序控制伺服电机模拟运行。改造后飞梭机故障率降低,刺绣精度得到改善,机器转速提高30%,从而提高了机器的整体效率。该方法可以作为同类旧设备以及完成类似将老式凸轮传动改造为电控变速驱动的借鉴。

Using numerical-approximation method to improvement movement regularity of the cloth-frame of embroidery machines

This paper introduced the reformation of the pure mechanical drive system of the old style embroidery machine using servo motor and microcomputer technique with focuses on its design and execution.The original machine head was replaced with servo motor to drive the cloth frame.The basic outline data of the cam was measured and the lifelike imitation of the movement curve of the old machine was obtained by numerical-approximation methods such as difference equation and third order spline function.Then the movement curve data was converted into step-by-step time partition of the servo motor and the simulation operation of the servo motor was controlled by program controller.After reformation of the machine,the breakdown is down,precision of embroidery is up,and the efficiency is raised by 30%.This method can be used as an reference for the renovation of the old machine of the same kind.