Locally pressurizing type injection molding machine
AssigneeSumitomo Heavy Industries, Ltd.
InventorNobuo Morikita
Life of this patent
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Abstract
A locally pressurizing type injection molding machine includes a stationary die and a movable die. An ejector pin extends through the movable die, with its tip end facing a mold cavity and its trailing end fixed by an ejector plate. A vibrating/pressurizing pin extends through the movable die and the ejector plate, with its tip end facing a resin passage and with its trailing end fixed by the vibrating/pressurizing plate. A vibrating/pressurizing actuator is disposed in rear of the vibrating/pressurizing plate, so that the vibrating/pressurizing can be effected through the vibrating/pressurizing plate, and the ejector pin can be advanced through the vibrating/pressurizing plate and the ejector plate, both by operation of the vibrating/pressurizing actuator.
Claims4
A locally pressurizing injection molding machine comprising:
- a stationary die,
- a movable die disposed for movement relative to said stationary die, between open and closed positions, said movable die and said stationary die defining a mold cavity therebetween in said closed position,
- an ejector pin slidably mounted in said movable die and having a tip end facing said cavity and a trailing end opposite said tip end,
- an ejector plate fixed to the trailing end of said ejector pin,
- a vibrating/pressurizing pin slidably mounted in said movable die and said ejector plate and having a tip end facing a resin passage in communication with said mold cavity and a trailing end opposite said tip end,
- a vibrating/pressurizing plate fixed to the trailing end of said vibrating/pressurizing pin,
- vibrating/pressurizing actuator means for vibrating said vibrating/pressurizing pin by applying a pulsating pressure against said vibrating/pressurizing plate, for advancing said vibrating/pressurizing plate into contact with said ejector plate and for further advancing said vibrating/pressurizing plate and said ejector plate together toward said dies;
- and
- control means for controlling the frequency and amplitude of said pulsating pressure.
Dependencies are inferred from the claim text.