PURCHASING SUPERVISOR WAS DIRECTING A LOADER OPERATOR TO UNLOAD A ROLL OF 48"" WIDE CONVEYOR BELTING. THE ROLL WAS SUSPENDED WITH A CHAIN FROM THE BUCKET TEETH AND AS THE ROLL WAS PLACED ON THE GROUND THE CHAIN WENT SLACK. INJURED EE REACHED BETWEEN THE BUCKET & THE ROLL OF CONVEYOR BELTING PINCH POINT WITH HIS RT.HAND & SUSTAINED A CRUSHING INJURY TO HIS HAND. SMALL FRACTURES.