Packing machine
When Engineer (not worker-san) staff adjust packing machine because of film flow was not good. He cut of safety sensor and he move the film by hand and check the flow. Then his left hand go into horizon cut area and he cut his hand(fingers) To check the flow, he did not switch off machine he knew where the safety sensor, so he cut off sensor for check movement.
(4fingers was injured by cut and ring-finger had broken bone)