The mechanism contains an inverted slider crank kinematic chain connected in parallel with a slider crank. The kinematic chain RTR´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 describe a range of coupler curves. The scheme was generated with the analysis software KOSIM. The movie was created for the geometric dimensions: l1 = 100 mm, l1´ = 100 mm, l2 = 500 mm, l2´ = 200 mm, l4 = 500 mm.