Lecture 16 Whitworth quick - return (motion) mechanism

Length of [Coupler ( Originally Link - 3) OR Driving Crank (Revised Link - 2)]  is made shorter than that of  [Crank ( Originally Link - 2) OR  Frame (Revised Link -1)]  in Slotted-lever quick-return mechanism so that the output link, namely, Slotted Lever [Revised link -4] performs oscillation.

If the length of Revised Crank (link -2) of Slotted-lever quick-return is made longer than that of its  [Frame (Revised link-1) OR Crank (Originally link -2)], then, output link, namely,  Slotted Lever [Revised link -4], will perform rotation instead of oscillation. Such a mechanism is used in shapers and slotting machines. Obviously, such mechanism is an example of second inversion of Crank - Slider Mechanism as crank [ Originally link - 2]  is fixed  and is known as Whitworth quick - return (motion) mechanism. 

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