Flexible link 1 runs over pulleys 6 and 7, of equal diameter, and oscillates about fixed axis A. Link 4, designed as a bent lever, is connected by turning pairs C and D to pulleys 6 and 7 and by turning pair F to link 5 which turns about fixed axis B. Link 3 is connected by turning pairs F and G to link 5 and to link 2 which, in turn, is connected by turning pair E to flexible link 1. When flexible link 1 turns about axis A, links 2, 3 and 4 have complex motions and link 5 oscillates about axis B.
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