这种平衡凸轮的设计计算在一般机械原理教材著作中是很少见的。

These kinds of cams are quite special, being rarely treated in ordinary technical literature on the theory of cam designs.

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新型环锭纺机利用弹性元件和干衡凸轮来替代传统用的重锤，以平衡升降部件的大部分自重，其中有用扭杆的，也有用螺旋圈簧的。

In new type ring frames, elastic members and balancing cams are used to replace the traditional dead weights for the balancing of the ring rails and other lifting parts.

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