| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive gas nozzle on-off mechanism performing the opening/closing operation of a nozzle without providing a special drive source and simple in structure. SOLUTION: A gas nozzle opening/closing mechanism is equipped with the fixed pin 5 having the gas injection port 10 allowed to communicate with a gas supply passage formed in the vicinity of the end part protruded into a mold cavity 2 thereof and an opening/closing body 6 present at a position closing the gas injection port 10 of the fixed pin 5 when the mold cavity 2 is not filled with a resin and moved so as to open the gas injection port of the fixed pin 5 by the pressure of the resin charged in the mold cavity 2.
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