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Geneva Mechanism

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The Geneva Mechanisms are often used in applications requiring indexing or intermittent rotational motions (a series of rotation followed by dwell sequences). The mechanism consists of a Geneva wheel, a crank wheel, a crank wheel shaft, and a crank pin as shown in the picture below. The wheel shown here has six radial slots and six arch segments. In this case, the Geneva wheel is turned 60 degrees for each rotation of the crank wheel. Both the number of dwell periods and rotations depends on the application. The number of radial slots in the Geneva wheel is determined by the number of dwell period and the dwell time is determined by the rotational speed of the crank wheel. In order to avoid infinite acceleration, the slot axis must be tangent to the circle traversed by the crank wheel pin center.