WE WAS MAKING BELT MOVE ON 3RD SHIFT. LIFTED TOP ROLLER-PLACING IT ON RAILS-ROLLER ROLLED OVER CATCHING LT HAND BETWEEN BOTH RAIL AND ROLLER-BROKE RING FINGER ON LEFT HAND. THIS INJURY DID NOT INVOLVE ANY ASPECT OF COMPLIANCE WITH RULES OR REGULATION, JOB SKILLS, ATTITUDE OR PROTECTIVE ITEMS.