EMPLOYEE WAS USING A ROPE TO LOWER A PART FROM ONE LEVEL TO ANOTHER. THE ROPE HAD 3 WRAPS AROUND A PIPE/RAIL. AS HE WAS LOWERING, THE ROPE CAUGHT ON FRAME ALLOWING SLACK IN TOP 1/3 OF ROPE. WH EN ROPE WAS FREED, EMPLOYEES FINGER WAS CAUGHT BETWEEN ROPE & RAIL.