Backlash-free drive for the infeed mechanism of a microtome

摘要: A backlash-free drive for the infeed mechanism of a microtome, comprising threaded spindle (1) mounted so as to be rotatable but axially non-shiftable, well two nut elements (2a, 2b) connected such that they are non-rotatable can shifted in an axial direction relative one another, said being spring-loaded against another direction. Acceptable tolerances conicity obtained by making use at least plain bearing (11,13;12,14) between and element (2a), specimen holder (16) via gear. Fences (30,32;31,33) acting rotation protect thread from deformation, do frictional clutches (24;25), which prevent excessive driving torques having effect allow user option operating micrometer with manual feed (22) or automatic device (26).