(好きな機構にはハートでも押してね)
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Lever crank mechanism【Four-bar linkage】

リンク | Link

A link mechanism in which the follower reciprocates as the driver rotates.

Force transmission is from the rotation side to the reciprocation side, and the link cannot be rotated from the reciprocation side. (If you add inertia, you can turn it)

The reciprocating motion can be adjusted by adjusting the length of the link, such as fast going and slow returning.