Whitworth quick return mechanism :
The Whitworth quick return mechanism converts rotary
motion into reciprocating motion, but unlike the crank and
slider, the forward reciprocating motion is at a different rate
than the backward stroke. At the bottom of the drive arm,
the peg only has to move through a few degrees to sweep
the arm from left to right, but it takes the remainder of the
revolution to bring the arm back. This mechanism is most
commonly seen as the drive for a shaping machine.
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