EMPLOYEE WAS USING A PULL ROPE AND COME-ALONG TO POSITION A TAKE UP ROLLER BACK INTO POSITION ON AN OVERHEAD BELT SYSTEM. HAD LT HAND POSITIONED ABOVE PULL ROPE ON BEAM, TIGHTENING COME-ALONG WHEN PULL ROPE MOVED UPWARD REPOSITIONING ITSELF CATCHING LEFT HAND FINGERS - RING, MIDDLE & POINTER.