Thermoplastic resin injection molding machine
AssigneeMurata Manufacturing Co., Ltd.
InventorsKunihito Seta, Takeshi Takeda
Life of this patent
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Abstract
An injection molding machine includes a plasticating unit for plasticating a thermoplastic resin, and an injecting unit connected to the plasticating unit through a connecting passage to inject the plasticated resin into a mold. In the connecting passage, provided is a buffering unit for reserving the resin in an amount at least equal to the quantity of the resin injected per one shot. The plasticated resin is temporarily reserved in the buffering unit, and then, the reserved resin is fed to the injecting unit when the measuring is carried out, whereby the plasticating unit can be driven continuously simultaneously with the operation of the injecting unit and the mold. The molding cycle can shortened with the plastication efficiency being enhanced.
Claims19
A thermoplastic resin injection molding machine comprising:
- a plasticating unit for plasticating a thermoplastic resin,
- an injecting unit connected to the plasticating unit through a connecting passage to inject the plasticated resin into a mold,
- a buffering unit having a buffering chamber having a volume at least equal to the injection quantity of the resin per shot, said buffering unit receiving the resin plasticated in the plasticating unit during an injection by the injection unit, and said buffering unit feeding a measured amount of the resin held in the buffering chamber into the injecting unit after injection by the injection unit, the buffering chamber provided in said plasticating unit, and
- a pressure sensor detecting a pressure in said buffering chamber wherein resin pressure is controlled to be constant in the buffering chamber based upon detected pressure.
A thermoplastic resin injection molding machine comprising:
- a plasticating unit for plasticating a thermoplastic resin,
- an injecting unit connected to the plasticating unit through a connecting passage to inject the plasticated resin into a mold,
- a buffering unit having a buffering chamber and receiving the resin plasticated in the plasticating unit, wherein the buffering unit is contained in the plasticating unit and is located in a longitudinal direction of the plasticating unit,
- a screw contained in the plasticating unit,
- a position detecting sensor detecting a change in position of the screw, and
- a controller calculating an amount of the resin in the buffering chamber based on the position of the screw and controlling the screw.
Dependencies are inferred from the claim text.