Geneva Wheel Mechanism
The Geneva wheel mechanism is shown in Fig. The input crank is typically a motor driven at a constant speed. The Geneva wheel is fitted with at least three equispaced, radial slots.
The mechanism shown here is having four slots. The crank has a pin that enters a radial slot and causes the Geneva wheel to turn through a portion of a revolution. When the point leaves that slot, the Geneva wheel remains stationary until the pin enters the next slot. This results in the intermittent motion of the Geneva wheel.
The crank is also fitted with an arc segment, which engages a matching cutout on the periphery of the Geneva wheel when the pin is out of the slot. This keeps the Geneva wheel stationary and in the proper location for the next entry of the pin. The number of slots determine the number of “stops” of the mechanisms where stop is synonymous with dwell. The slot provided must be tangential to the path of pin while engaging with the pin to reduce shock and jerk.
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