Pulleys 2 and 5 are of equal diameter, as are pulleys 4 and 6. Link 1, designed as a bent lever, is connected by turning pairs A, B and E to pulleys 2 and 5 and to flexible link 7 which runs over pulleys 4 an 6. Link 3, designed as a bent lever, is connected by turning pairs C, D and F to pulleys 4 and 6 and to flexible link 8 which runs over pulleys 2 and 5 and is rigidly secured at points G and H to the base. When link 1 has straight translational motion, pulleys 2 and 5 roll along flexible link 8 and pulleys 4 and 6 rotate about axes C and D, imparting complex motion to link 3.
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