Belt linear translating motion
Input: pink crank. Grey pulley is stationary. Belt drive of transmission ratio 1/1 keeps yellow rotary runway always vertical. Triangular cam
makes blue slider move up/down. Spring follower moves one way direction thanks to deep portion (in black) of the cam groove. So the
blue slider translates along a triangular trajectory (green triangle). Time for tracing horizontal portion of the trajectory corresponds 1/2
input revolution. It can be used for plantigrade machines of 2 legs.
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