Pulley 1 rotates about fixed axis C and, through flexible link 2, rotates pulleys 5, 6 and 7 about fixed axes A, B and D. Link 3 is connected by turning pairs E and F to flexible link 2 and to link 4 which turns about fixed axis G. When pulley 1 rotates about axis C, link 4 oscillates about axis G. The law of motion of the mechanism can be varied by changing the diameters of pulleys 1, 5, 6 and 7, and the location of their axes of rotation.
$1892$FL,ML$