A crushing mechanism having at least two pairs of co-acting rollers each roller having a hub with a plurality of teeth extending from a circumference thereof, the pairs of rollers being mounted in open cage fashion, wherein each tooth having, at least at an outermost position, the form of a fiat plate angled relative to a radius of the hub with an edge laying parallel with a roller axis, the rollers at their closest positions having plates on one in spaces between plates in the other, said plates of said at least two pairs of co-acting rollers comprising a means for crushing without scraping material in said crushing mechanism, said angle of each plate is substantially the same angle which would be present on a face of a gear tooth between co-acting rollers having gear teeth for crushing material.