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This model shows the oscillating mechanism of a fan. The long shaft is connected directly to the fan blades (not shown) and the large step in the shaft represents the motor. The shaft is driving a worm gear which has a smaller gear connected below it. This smaller gear is meshed with a bigger gear and a link is connected to the outer radius of the bigger gear. The other end of the link is restricted to only move in one direction, causing the link to oscillate.
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