Explain slotted time quick return mechanism with neat sketch.

Explain slotted time quick return mechanism with neat sketch. 
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Answer :

The slotted lever quick return mechanism is illustrated in Figs. a and b The crank AB (of adjustable length R) rotates with a uniform angular speed. The crank pin B is in the shape of a die block which is free to slide inside the slot in the slotted lever OBC. This slotted lever is pivoted at O and the other end C is connected to the ram by a short link arm as shown in Fig. (a).  When the crank AB rotates clockwise from position AB1 to AB2, the ram moves forward from left to right and when it rotates from position AB2 to AB1 the ram returns back to its original position. Clearly the time taken to complete forward stroke is proportional to angle (refer to Fig. (b)) and the return stroke is completed in less time which is proportional to angle β.

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