FIELD: instrument engineering; measurement technology. SUBSTANCE: mechanism has moving member installed in guides positioned on body, roller and flexible members which embrace roller along entire length of its section circumference. Roller may be of stepped form in longitudinal section, and it may be positioned under moving member. Ends of flexible members secured on body and on moving member may be positioned on one or different sides relative to roller axis, respectively. In mechanism variant moving member is located outside body, and roller is installed above moving assembly. Invention provides for enhancement of moving member positioning accuracy. EFFECT: simplified construction. 4 cl, 7 dwg
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