A modification to the slider crank mechanism where the crank-centre does not lie on the slider axis. The slider hits the dead centres by traversing on a line. The system has three links, namely a crank, a driven link and the slider. They are connected with two revolute joints; one between the crank and the driven link and one between the slider and the driven link; and one prismatic joint between the slider and fixed link ( guide/ ground). The system has therefore one degree of freedom.