Patent ID: 7665978

Claim:
An injection molding machine having centering means for centering a nozzle hole in an injection nozzle to a sprue hole, the centering means comprising: a distance measuring unit that measures a distance from the distance measuring unit to a first reference point at a known distance from the central axis of the nozzle hole; means for obtaining a displacement between the central axis of the nozzle hole and a known central axis of the sprue hole using the distance measured by the distance measuring unit; and means for adjusting the position of the injection nozzle using the obtained displacement, wherein the distance measuring unit is a single movable unit associated with a motion guiding member said motion guiding member guiding movement of the single movable distance measuring unit so that the displacement between the central axis of the nozzle hole and the central axis of the sprue hole can be obtained in a plurality of directions by moving the single movable distance measuring unit to different positions.