QUICK RETURN MECHANISM

QUICK RETURN MECHANISM INTRODUCTION:   A quick return mechanism is an apparatus to produce a reciprocating motion in which the time taken for travel in the return stroke is less than in the forward stroke. It is driven by a circular motion source and uses a system of links with three turning pair and one sliding pair. This mechanism is mostly used in shaping machines, slotting machines and in rotary internal combustion engines.     TYPES OF QUICK RETURN MECHANISM: 1. Whitworth Quick Return Mechanism   2. Crank and Slotted Link Mechanism  3. Hydraulic Drive    WHITWORTH QUICK RETURN MECHANISM : Fig 1 : WHITWORTH QUICK RETURN MECHANISM This mechanism converts rotary motion into oscillating motion, just like chronic and lever mechanism. Whitworth's quick return system is the second inversion of the slider crank mechanism in which the slider is fixed. In this mechanism, the bull gear is used and it has a crank pinion. The sliding blo...