Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to close mold
Patent
1998-02-05
2000-02-15
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to close mold
425594, B29C 4564
Patent
active
060245603
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improvement of an injection molding machine.
BACKGROUND ART
Horizontal injection molding machines comprise a mold clamping unit and an injection unit that are arranged in the horizontal direction on a base, and is constructed in the following manner, as shown in FIG. 30A, for example.
A mold clamping unit 96 is composed of a stationary platen 3, moving platen 4, rear platen 5, mold clamping mechanism TG, etc. The stationary platen 3 is fixed to a base BS, and is coupled to the rear platen 5 by means of tie bars 2. The moving platen 4 is located between the stationary platen 3 and the rear platen 5, and the tie bars 2 are passed individually through holes that are formed in the moving platen 4. The mold clamping mechanism TG is located between the rear platen 5 and the moving platen 4, and a crosshead 10 moves straight toward the stationary platen 3, thereby carrying out mold closing operation, as a ball screw BT rotates. Molds (stationary mold SM and moving mold MM) are fixed to the stationary platen 3 and the moving platen 4, respectively.
An injection unit 8 is provided on the side of the stationary platen 3 which is remoter from the moving platen 4. When it is moved toward the moving platen 4 by means of a ball screw & nut (nozzle-touch mechanism) NT, a nozzle 12 of an injection cylinder 11 projects through a through hole TH in the central portion of the stationary platen 3, and comes into contact with the stationary-side mold SM.
The injection molding machines described above require use of guide rods (not shown) for assisting the crosshead 10 in rectilinear movement. On the other hand, the injection unit 8 itself is mounted on the base BS of the injection molding machine by means of exclusive guide rods (not shown), such as linear motion guides, and is moved toward or away from the stationary platen 3. Thus, the guide rods for the crosshead 10 are arranged independently of the guide rods for the injection unit 8, in the mold clamping mechanism section.
Vertical injection molding machines comprises a mold clamping unit and an injection unit that are arranged in the vertical direction. Some of them have the same basic construction as the aforementioned horizontal injection molding machines. As shown in FIG. 30B, however, a vertical injection molding machine disclosed in Japanese Patent Publication, KOKAI No. 8-52756, has the following configuration. A moving platen 4 and a rear platen 5 are arranged above and below a stationary platen 3, respectively, that is fixed to a machine frame FR, and they are coupled by means of tie bars 2 that penetrate the stationary platen 3.
Molds (stationary mold SM and moving mold MM) are mounted on the stationary platen 3 and the moving platen 4. An injection unit 8 is located above the moving platen 4 (on the side remoter from the stationary platen 3), and is moved toward the moving platen 4 by means of a ball screw & nut (nozzle-touch mechanism) NT, whereupon a nozzle 12 of an injection cylinder 11 projects through a through hole TH in the central portion of the moving platen 4, and comes into contact with the moving-side mold MM. A mold clamping mechanism TG is located between the stationary platen 3 and the rear platen 5, and a crosshead 10 is moved straight toward the stationary platen 3 by means of a ball screw BT.
The aforementioned vertical injection molding machine, which uses a toggle-type mold clamping mechanism, also require use of guide rods (not shown) for assisting the crosshead 10 in rectilinear movement. On the other hand, the injection unit 8 is guided by exclusive guide rods (not shown) set up on the moving platen 4 as it moves toward or away from the stationary platen 3. Thus, the guide rods for the crosshead 10 are arranged, independently of the guide rods for the injection unit 8, in the mold clamping mechanism section.
Both the horizontal injection molding machine of FIG. 30A and the vertical injection molding machine of FIG. 30B are subject to the following problems.
(a) The overall length is
REFERENCES:
patent: 3292214 (1966-12-01), Battenfeld et al.
patent: 4636167 (1987-01-01), Shibata
patent: 4708631 (1987-11-01), Hehl
patent: 5565224 (1996-10-01), Stillhard
Ito Susumu
Yoshioka Mitsushi
Fanuc Ltd.
Mackey James P.
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