"从动件停歇" can be translated into English as "dwell of the follower" or "follower dwell".
In mechanical engineering terminology, "从动件" (follower) refers to the component that is driven by another part (such as a cam), and "停歇" (dwell) describes the period when the follower remains stationary despite the motion of the driving part.
Both expressions are commonly used to describe this phenomenon in English-speaking engineering contexts.