Two identical two-stepped pulleys 3 and 4 rotate about fixed axes A and B. Flexible link 1 runs over both steps of pulleys 3 and 4, and rollers 5 and 6 which rotate about axes C and D of slide 2. Slide 2 reciprocates along fixed guides a-a. The mechanism allows slide 2 to be moved to various positions along guides a-a without changing the motion of flexible link 1.
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