Input: the green gear to which a long arm is fixed.
Two short arms (each carries two rollers) are connected to both ends
of the long arm by revolution joints. Due to the orange gear cams and
slots in the circular runway, the short arms change direction every half-turn of the long arm.
The plates fixed to the short arm always show the red surface outward when they are on the right side of the circular runway.
Transmission ratio of the gear drive is 2.

STEP files of this video:
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Inventor files of this video:
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