| 摘要 |
An ejector pin of an injection mold includes a sleeve, a valve structure, and a biasing member. The sleeve has a passage hole and an enlarged hollow portion, which communicate with each other via a stepped portion engaged therebetween. The valve structure has a valve portion and a collar portion, which are disposed in the sleeve. The collar portion of the valve structure is biased by the biasing member such as a spring and stopped by the stepped portion. Gaps interposed between the valve structure and the sleeve serve as a gas passageway through which gas in a molding cavity is exhausted by a vacuum pump.
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