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