| 摘要 |
A valve device for an injection nozzle in an injection molding machine which includes a piston defined therein with a vertical cylindrical space having a lower portion partially receiving the injection nozzle adapted to inject molten resin into the cavity of a mold, and an upper portion partially receiving a connector adapted to connect the injection nozzle to a cylinder serving to supply molten resin. The piston also has a valve pin carrying portion configured to vertically support a valve pin in such a fashion that the valve pin moves vertically. The valve pin carrying portion extends diametrically across the cylindrical space of the piston. The valve pin carrying portion of the piston is provided at a central portion thereof with a hole for carrying a head of the valve pin in such a manner that the valve pin extends downwardly in a vertical direction. In this valve device, it is possible to not only obtain an optimum stroke of the piston, but also to minimize the size of the valve device. Therefore, the valve device is proper for the molding of small-size resin products.
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