Link 1, of round cylindrical cross section, is arranged between guide rollers 2 which have annular vee grooves d. Screws a adjust the axial position of the rollers. With respect to rollers 2, link 1 accomplishes one translational motion along axis x-x and one turning motion about the same axis x-x. To reduce friction losses in the sliding of link 1 along axis x-x, rollers 2 rotate freely about their pins b.
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