Plastic article or earthenware shaping or treating: apparatus – Miscellaneous
Reexamination Certificate
1999-06-16
2001-06-05
Pyon, Harold (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Miscellaneous
C033S613000
Reexamination Certificate
active
06241507
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a device for aligning a nozzle of an injection unit of a vertical injection molding apparatus with a sprue of a mold.
2. The Prior Art
In injection molding, high temperature melted plastic is injected via a nozzle into a mold under great pressure. The temperature and pressure of the melted plastic often damages the mold. Furthermore, the mold undergoes wear and abrasion. Thus, the mold of an injection molding apparatus requires frequent maintenance and replacement in order to maintain precise molding dimensions. Maintenance of the mold requires the mold to be removed from the apparatus and then remounted in the apparatus for further operation. When remounting the mold to the apparatus, an adjustment of the relative position between the mold and the injection nozzle must be performed in order to exactly align the nozzle with a sprue of the mold. Conventionally, this is done by manually moving the mold with respect to the nozzle and then visually checking for perfect alignment therebetween. The process must be repeated several times until perfect alignment is obtained, which is time-consuming and laborious.
It is thus desirable to provide an aligning device for aligning an injection nozzle with a mold sprue and a method of using the aligning device to readily align the nozzle with the sprue.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an aligning device for aligning an injection nozzle of an injection molding apparatus with a spruce of a mold when mounting the mold to the injection molding apparatus.
Another object of the present invention is to provide a method for efficiently aligning an injection nozzle of an injection molding apparatus with a spruce of a mold when mounting the mold to the injection molding apparatus.
To achieve the above objects, an aligning device in accordance with the present invention comprises a barrel defining an interior space for receiving a spring therein. The barrel has first and second axial ends to which a nozzle aligning member and a sprue aligning member are respectively mounted. The sprue aligning member has a pin inserted into a sprue of a mold for removably fixing the aligning device on the mold. The nozzle aligning member is spring-biased to have a projection thereof in contact with a nozzle of an injection molding apparatus. Thus, by moving the mold and the aligning device with respect to the nozzle until an end of the projection is inserted into the nozzle, an exact alignment between the nozzle and the sprue is accomplished.
REFERENCES:
patent: 1141396 (1915-06-01), Jubinville
patent: 1470679 (1923-10-01), Bellringer
patent: 2466380 (1949-04-01), Clark
patent: 2484801 (1949-10-01), Anderson
patent: 2685824 (1954-08-01), Coop
patent: 4447956 (1984-05-01), Chung
patent: 4982489 (1991-01-01), Haugen
patent: 5299346 (1994-04-01), Kilgore et al.
Chung Wei Te
Hon Ahi Precision Ind. Co. Ltd.
Luk Emmanuel
Pyon Harold
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