Spatial Ratchet Mechanism

Input: orange oscillating crank.
Output: green twin ratchet wheel of tooth number Z.
Both go and back motions of the crank make the wheel rotate in the same direction.
In 1 rev. of the input, the output rotates 1/Z rev. with two dwells.
Angle deflection between the two ratchet wheels is 360/2Z deg.

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