Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Longest link is a fixed link
Slider is a fixed link
Coupler link is fixed
Smallest link is a fixed link

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Theory of Machine
Cam angle is defined as the angle

Of rotation of the cam for a definite displacement of the follower
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Through which, the cam rotates during the period in which the follower remains in the highest position
During which the follower returns to its initial position

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then

Acceleration and velocity of the piston P is zero
Acceleration of the piston P is maximum and its velocity is zero
Acceleration of the piston P is zero and its velocity is maximum
Acceleration and velocity of the piston P is maximum

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