EE WAS REMOVING GUARD FOR REPAIR OF PLANT FEEDERWHEN GUARD WAS REMOVED THE DRIVE ARM CAME LOOSE,SWUNG DOWN KNOCKING HIM OFF THE LADDER HE WAS STANDING ON. HE FELL TO THE FLOOR STRIKING HIS BAC K ON THE GUARDING. THIS RESULTED IN SEVERE CONTUSIONS AND FRACTURED RIBS ON LOWER LEFT SIDE. HE TRIED TO RETURN TO WORK BUT THE PAIN WAS INTENSE& HE HAS BEEN OFF SINCE 10/30/00.