Pulleys 1 and 2 are of equal diameter, as are pulleys 4 and 6. Pulley 1 rotates about fixed axis A and, through flexible link 5, rotates pulley 2 about fixed axis B. Link 3, designed as a bent lever, turns about axis B and is connected by turning pairs D and C to pulleys 4 and 6. Flexible link 7 runs over pulleys 4 and 6 and is connected by turning pair F to flexible link 5. When pulley 1 rotates about axis A, pulleys 4 and 6 rotate about axes D and C, imparting oscillating motion to link 3.
$2102$FL,Sa$