Four identical pulleys 3, 4, 5 and 6 rotate about fixed axes A, B, C and D. Pulleys 7 and 8 rotate about axes E and F of slide 2 which reciprocates along fixed guides a-a. Flexible link 1 runs over pulleys 3, 4, 5, 6, 7 and 8, and its ends are connected by turning pairs E and F to pulleys 7 and 8. When any of pulleys 3, 4, 5 and 6 is rotated first in one direction and then in the other, slide 2 reciprocates along guides a-a.
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