DURING PLANT OPERATIONS, BOLTS WORKED OUT OF THE FEEDER BOX UNDERNEATH THE BIN, CAUSING THE FEEDER BOX TO DROP INTO THE FEEDER. THREE EMPLOYEES ATTEMPTED TO PUT THE FEED BOX BACK INTO PLACE WHEN THE BOX DROPPED DOWN INTO THE FEEDER, PINCHING THE EMPLOYEE'S RIGHT THUMB, CAUSING HIM TO GET STITCHES IN HIS THUMB.