EE WAS CHANGING OUT A CARRYING IDLER ON THE SHUTTLE CONVEYOR. IN ORDER TO TIGHTEN THE IDLER HE WAS PLACING THE ROLLERS ON A CART. WITH THE ROLLER IN HIS HANDS HE SWUNG BACK STRIKING & PINCHING HIS LT. RING FINGER BETWEEN THE ROLLER & CONVEYOR FRAME. HE WAS DIAGNOSED WITH A DISTAL TIP FRACTURE AND A HEMATOMA.