Question: For the quick - return mechanism below, the links are I 1 = 3 , I 2 = 2 , I 3 = 3 ,

For the quick-return mechanism below, the links are I1=3,I2=2,I3=3,I4=3.
(1) Find the existence of crank,
(2) Draw a kinematic diagram to show all the toggle positions, and
(3) Determine the time ratio Tr.
For the quick - return mechanism below, the links

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