对衡量急回运动特性程度的行程速比系数的可能取值范围进行了严密分析；
The possible values of advance-to-return-time ratio, which is used to measure the degree of quick-return for crank-rocker mechanism, are analyzed precisely.
本文分析偏置双曲柄滑块机构的急回运动特性，给出了按最小传动角设计偏置双曲柄滑块机构的设计方法和设计曲线。
The characteristic of quick-return of offset double crank slider mechanism was analyzed in this paper. The synthesis method and curve of this mechanism with minimum transmission angle were presented.
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