Patent ID: 7258543

Claim:
A vertical micro-injection machine for molding microparts comprising: a plasticizing unit ( 30 ), in which a feeding channel for heating and melting a material in the feeding channel is provided and a screw or a plunger ( 31 ) for transporting the molten material is provided in the feeding channel; an injection unit ( 40 ) adapted to receive a metered amount of the molten material from said plasticizing unit ( 30 ); an injection mold ( 60 ) adapted to receive the metered amount of the molten material from the injection unit ( 40 ); at least two thrust cylinders ( 20 ) adapted to close the injection mold ( 60 ) before injection and open the injection mold ( 60 ) after injected parts solidified; characterized in that the injection unit ( 40 ) includes an injection cylinder ( 42 ), the injection cylinder ( 42 ) is connected with the feeding channel of the plasticizing unit ( 30 ), and a vertically reciprocating plunger ( 41 ) is provided in the injection cylinder ( 42 ), which can expel air above the molten material in the injection cylinder ( 42 ) by its upward advancement and then push the molten material into the injection mold ( 60 ).