Analyzing the motion inversion of the limit of the crank rocker mechanism, drawing the relative supplementary circle, and designing the mechanism up to requirement.

对曲柄摇杆机构极限位置进行运动倒置分析，作出相应辅助圆，从而设计出满足条件要求的机构。

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Inverson of circle: Into a circle, if the circle pass through inversion center o, it becomes a straight line.

圆的反演：反演成一圆。但当圆通过反演中心时变成一直线。

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