Teeth numbers of two small gears Z1 = Z2 = 20 Teeth number of the large gear Z0 = 40

Gear module m = 2 mm

Length of the pink crank a = 150 mm

Length of the green connecting rod b = 220 mm

The green gear irregularly rotates (with going back) 1 revolution when the pink crank rotates 1 revolution in the opposite direction.