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Simple mechanism for intermittent 120 deg. rotation

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Input: horizontal cam shaft. Output: green 3-pointed star that rotates intermittently. It has prismatic joint with blue vertical shaft of two motions (up-down and rotary). Orange bar angularly positions the vertical shaft. Unusual thing: 2 (cam and friction drives) in 1. Disadvantage: considerable wear when the vertical shaft does not rotate. In term of function this mechanism is equivalent to the spatial Geneva drive STEP files of this video: Inventor files of this video:

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