The mechanism contains a slider crank kinematic chain connected in parallel with a slider crank. The kinematic chain RRT´s joints are connected with the crank and coupler of the slider crank. By means of changing the geometrical lengths of the mechanism´s links, the coupler point M describes a range of coupler curves. The image shows a scheme of the mechanism, generated with the analysis software KOSIM for the geometrical variant: l1 = 20 mm, l1´ = -57 mm, l2 = 77 mm, l4 = 70 mm, x = -4 mm, α = 25°.