EE WAS ATTEMPTING TO REMOVE A GUARD FROM A TAIL PULLEY WHEN THE TAIL PULLEY FELL A FEW INCHES. EE'S FINGER WAS CAUGHT BETWEEN TAIL PULLEY AND RAILING. THE TIP OF HIS MIDDLE FINGER (RT) WAS AMPUTATED. CONVEYOR WAS LOCKED OUT AND ALL COMP.SAFETY RULES WERE BEING FOLLOWED. THIS WAS A NEWPIECE OF EQUIPMENT THAT EE WAS NOT FAMILIAR WITH.