Crank 1 rotates about fixed axis x-x. Link 2 is connected by turning pairs A and B to crank 1 and ring 3 which turns about fixed axis y-y. Upon rotation of crank 1 about axis x-x, ring 3 oscillates about axis y-y under the condition that the axes of all kinematic turning pairs intersect at a single point. Link 2, hinged to crank 1, is shown in a cut-away view.
$561$LW,4L$