2. Fourbar Quick return(急回特性) The toggle positions are C determined by the f colinearity o B 慢速 the two of the 快速 movins ng links B They also define the limits of Toggle position motion of the 极限位置 driven rocker2. Fourbar Quick return （急回特性） Toggle position 极限位置 The toggle positions are determined by the colinearity of the two of the moving links. They also define the limits of motion of the driven rocker