MAINTENANCE MAN WAS CALLED TO MUDROOM TO ADJUST THE TRACKING OF THE CONVEYER BELT UNDER THE MIXER. NO ONE WAS AWARE THAT HE BEGAN TO ADJUST THE BELT. HIS RIGHT HAND/ARM BECAME ENTANGLED IN THE TAIL ROLLER. TWO MEN RESPONDED TO HIS SCREAMING AND FOUND EE WITH HIS RIGHT ARM IN THE TAIL ROLLER UP TO HIS SHOULDER. RESULTED IN BREAKING HIS RIGHT UPPER ARM, IT PIERCED HIS SKIN.