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动力头的往复运动——让支架和连接组件通过机械传动来实现往复移位运动,看来是不切实际的。这在很大程度上是由于需要在每分钟内作0～120次的无级调速往复运动,
Reciprocation of the power head - it seems impractical to have the bracket and the connecting assembly reciprocate by mechanical transmission. This is due in large part to the need to make 0 to 120 stepless speed regulation reciprocating motions in every minute,