The roller is mounted between two arms (1) which extend beyond the support bearings (13) for the rollers. The extensions form stops (6) which lie against stop bolts (7). The stop bolts are mounted in rails (8) which have several holes in which the stop bolts can be mounted. The stops determine the height (H) between the bottom of the roller and the plate (3) over which the material to be crushed is moved. The motor (5), which drives the roller via a belt (10), is mounted on a support which is mounted between and is attached to the ends of the arms. The motor support hinges with the arms (1a).
