Whitworth Quick Return mechanism The Whitworth Quick Return Mechanism converts rotating motion into oscillatory motion using a bull gear with a crank pinion. An electric motor shaft drives the crank pinion, and the bull gear rotates in synchronisation with the crankpin.
A quick return mechanism converts rotary motion into reciprocating motion where the return stroke is faster than the forward stroke. This is achieved by designing the mechanism so that the cutting or working stroke takes a longer time, while the return stroke is significantly faster. This is crucial in machines like shapers, where metal removal happens only during the forward stroke, and the return stroke is idle.