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CRANK DRIVE OF A PARALLEL-CRANK MECHANISM

The lengths of the links comply with the conditions: A͞B=D͞C and A͞D=B͞C. With each of four driven cranks 3, driving crank 1 forms a parallel-crank linkage in which the lengths of the links are respectively equal to those of linkage ABCD. The common connecting rod of all the linkages is round disk 2. The angular velocities of cranks 3 are equal.
$635$LW,PC$