针对裹包机中常用的凸轮机构，考虑构件的弹性，建立了两自由度的动力学方程。计算结果表明，若不考虑杆件的弹性作用，就不能准确得出机构的加速度-时间历程。为保证凸轮机构的正常运转奠定了基础。

Based on the elastic property of the mechanical component the two degree of freedom dynamic equations are established. The acceleration-time history of mechanism can not be obtained successfully if not considering the elastic effect of the components when the machine runs with high speed.