Television – Special applications – Manufacturing
Reexamination Certificate
1999-12-16
2002-06-04
Le, Vu (Department: 2613)
Television
Special applications
Manufacturing
C264S040500
Reexamination Certificate
active
06400398
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a calibration method for precisely aligning the center of a die entrance bushing with the center of an injection nozzle of an injection molding machine.
2. Description of the Related Art
A conventional injection molding machine in accordance with the prior art shown in
FIGS. 7 and 8
comprises a fixed frame
83
defining a tapered opening
84
therein, a die
80
secured to the fixed frame
83
and defining a cavity
82
therein, a die entrance bushing
81
mounted in the die
80
and connecting to the cavity
82
and the tapered opening
84
, and an injection nozzle
86
secured to a feed tube
85
which is movable relative to the fixed frame
83
so that the injection nozzle
86
can be moved into the tapered opening
84
of the fixed frame
83
to contact the die entrance bushing
81
so as to inject plastic raw material contained in the feed tube
85
into the cavity
82
of the die
80
. The plastic raw material may reversely flow from the die entrance bushing
81
when the center of the die entrance bushing
81
does not register the center of the injection nozzle
86
. Therefore, it is important to align the center of the die entrance bushing
81
with the center of the injection nozzle
86
.
A conventional calibration method in accordance with the prior art comprises providing a needle
88
on the injection nozzle
86
. The feed tube
85
is then moved relative to the fixed frame
83
until the needle
88
contact the die entrance bushing
81
so as to inspect the deviation between the die entrance bushing
81
and the injection nozzle
86
by eyesight. The position of the die
80
is repeatedly adjusted so as to adjust the position of the die entrance bushing
81
for manually aligning the center of the die entrance bushing
81
with the center of the injection nozzle
86
. Therefore, the operation of the conventional calibration method is not easily performed, it requires a long period of time for calibrating the center of the die of the injection molding machine. Further, an operator needs to get close to the feed tube
85
so as to calibrate the center of the die of the injection molding machine by eyesight so that the operator is easily injured by the feed tube
85
which is often very hot.
The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional calibration method.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a calibration method for aligning a center of a die entrance bushing with a center of an injection nozzle of an injection molding machine.
The calibration method includes the following steps: (a) moving a camera to project an image of an injection nozzle of an injection molding machine onto a screen of the camera so as to align a center of the injection nozzle with a center of the screen; (b) moving a die entrance bushing of a die of the injection molding machine relative to the camera to project an image of the die entrance bushing of the die onto the screen of the camera; and (c) moving the die relative to the camera so as to align a center of the die entrance bushing with the center of the screen so that the center of the die entrance bushing aligns with the center of the injection nozzle. The screen includes a cross coordinate mounted thereon, and a plurality of scales mounted thereon.
The calibration method further includes the step of providing at least one mark on a tapered opening of the injection molding machine so as to correct the center of the screen of the camera, wherein the tapered opening is located between the die entrance bushing and the camera.
The calibration method further includes the step of inspecting the distance between the center of the die entrance bushing and the center of the screen so that the distance is used as a distance for moving the die relative to the camera.
The calibration method further includes the step of providing a swing arm pivotally mounted on a fixed frame of the injection molding machine; and mounting the camera on the swing arm.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 3628901 (1971-12-01), Paulson
patent: 3642401 (1972-02-01), Wilson
patent: 4069948 (1978-01-01), Saaty et al.
patent: 4236181 (1980-11-01), Shibata et al.
patent: 4841364 (1989-06-01), Kosaka et al.
patent: 5247585 (1993-09-01), Watanabe
patent: 5599486 (1997-02-01), Fujishiro et al.
patent: 5928578 (1999-07-01), Kachnic et al.
patent: 5997778 (1999-12-01), Bulgrin
patent: 63-118224 (1988-05-01), None
patent: 10-113967 (1998-05-01), None
patent: 2001-225373 (2001-08-01), None
Bulgrin et al., “The application of advanced control theory to enhance molding machine performance”, IEEE, Apr. 1994, pp. 94-102.
Le Vu
Rosenberg , Klein & Lee
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