| 摘要 |
PURPOSE: A hot runner injection molding apparatus having a nozzle centering mechanism in a joint motion type is provided to prevent the offset of a nozzle because a thermal expansion is not directly delivered to the nozzle. CONSTITUTION: A hot runner injection molding apparatus having a nozzle centering mechanism in a joint motion type comprises a joint unit(33) and a joint motion unit(80). The joint unit is formed in a nozzle(30). The joint motion unit moves the joint unit of the muzzle depending on a backup plate(40). The joint motion unit compensates the movement of the backup plate caused by a thermal expansion if the backup plate is thermally expanded.
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