The mechanism contains an inverted slider crank 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 = 145 mm, l2 = 720 mm, l1´ = 165 mm, l2´ = 180 mm, l4 = 500 mm.