Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With accumulator – trap chamber – or serially arranged valves...
Patent
1996-08-08
1998-06-23
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With accumulator, trap chamber, or serially arranged valves...
425558, B29C 4548
Patent
active
057702462
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an injection molding machine. More specifically, the present invention relates to an injection molding machine in which molding material introduced into an injection chamber formed by an injection cylinder is pushed out from the injection chamber into a metal mold by an injection plunger.
BACKGROUND TECHNOLOGY
In order to push out molding material from an injection chamber formed by an injection cylinder into a metal mold, injection molding machines of the type which use injection plungers usually have a heating cylinder which pre-plasticizes the molding material by heating it before the molding material is introduced into the injection chamber. In general, a channel is provided on this type of injection molding machine in order to connect the hole in the heating cylinder with the injection chamber, and a ball-type check valve is provided within that channel in order to prevent the reverse flow of melted molding material in the injection chamber into the heating cylinder hole when the injection plunger advances.
FIG. 12 is an illustration of a commonly used injection molding machine "U" in which an injection plunger is used to push out pre-plasticized molding material from the injection chamber. This injection molding machine "U" includes a plasticizing unit 1 and an injection unit 2 having an injection cylinder 20, which forms injection chamber 22.
The plasticizing unit 1 includes a heating cylinder 11, which forms a plasticizing chamber 15, and a screw 12, which moves back and forth within the plasticizing chamber 15. A hopper hole 13 is formed in the heating cylinder 11, and resin material is supplied therefrom to a pre-plasticizing chamber
The injection molding machine "U" includes a screw drive device 4, which drives the screw 12. The screw drive device 4 includes a motor 41, a cylinder 42, and a piston 43, which moves back and forth within the cylinder 42 by means of hydraulic pressure. The piston 43 is linked to the screw 12 at its front end and to the motor 41 at its back end.
The plasticizing chamber 15 is connected to an injection chamber 22 by means of an appropriate channel 10. The molding material in the plasticizing chamber is plasticized by the rotation of screw 12, and the molding material thus plasticized flows into the injection chamber 22 through a channel 10.
The injection unit 2 includes an injection plunger 21, which moves back and forth within the injection chamber 22, which is a hole in the injection cylinder 20 having a uniform diameter over the entire length thereof. The injection plunger 21 has a shank 21b and a head 21a, the diameter of which is larger than that of shank 21b; it is connected to a ram 27 by rod 26. A window 28 is formed on the back edge of the injection cylinder 20 in order to push the molded material which leaks out of the injection chamber 22 through the gap between the inside wall of the injection cylinder 20 and the injection plunger 21 out of the injection cylinder. The ram 27 moves back and forth by means of hydraulic pressure within the cylinder 55, which is supported within a casing 58a. A casing 58b, which surrounds the connection section between the injection plunger 21 and the rod 26, is linked to the injection cylinder 20 by a flange coupling 29. Case 58a, which supports the cylinder 55, is connected to the casing 58b.
A nozzle adapter 39 is affixed to the front edge of the injection cylinder 20 by means of a bolt 35, and a nozzle 3, which has an opening 32, is attached to the nozzle adapter 39. The nozzle adapter 39 has a channel 31 which penetrates it and which connects the injection chamber 22 to the opening 32, which opens in proximity to the injection chamber 22 in the injection cylinder 20. Melted molding; material pushed out from the injection chamber 22 by the to the opening 32 through the channel 31 and the secondary path 36. From the; opening 32, it is directed to a metal mold affixed to a fixed platen 7.
As is best shown in FIG. 9, the injection plunger 21 includes a head portion 21a and
REFERENCES:
patent: 4133855 (1979-01-01), Pahl
patent: 4726751 (1988-02-01), Shibata et al.
patent: 5499915 (1996-03-01), Fujita
Webster's Ninth New Collegiate Dictionary, p. 469, 1986.
Heitbrink Tim
Sodick Co. Ltd.
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