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

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

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Theory of Machine
The contact ratio is given by

(Length of path of recess)/(Circular pitch)
(Length of the arc of contact)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of the path of approach)/(Circular pitch)

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