Clamping apparatus of an injection molding machine

Details Clamping apparatus of an injection molding machine Clamping apparatus of an injection molding machine

2000-04-06

2002-11-12

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

C425S593000

Reexamination Certificate

active

06478571

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a clamping apparatus of an injection molding machine, and especially to a mold clamping apparatus for building a clamping force in equilibrium.
DESCRIPTION OF THE PRIOR ART
As shown in
FIGS. 1 and 2
, a conventional mold clamping apparatus of an injection molding machine is illustrated, which includes a fixed platen A
1
, a movable platen A
2
, a rear platen A
3
, two pairs of parallel tie bar A
4
at four corners and an ejector apparatus B. The rear platen A
3
and the movable platen A
2
are connected by a toggle mechanism A
5
. By a clamping hydraulic cylinder A
6
at the end surface of the rear platen A
3
to push a crossed head A
7
, and then the crossed head A
7
to drive the toggle mechanism A
5
, the actions of opening mold and closing mold are performed. Two guide rods A
8
are installed between the rear platen A
3
, crossed head A
7
and the movable platen A
2
for guiding the crossed head A
7
and supporting the ejector apparatus B. Other than a clamping hydraulic cylinder A
6
, the end surface of the rear platen A
3
is further installed with a set of mold adjusting means including a driven motor A
9
, a driving gear A
10
, a gear A
11
, a female screw gear A
11
, a female screw supporter A
12
and fixed plate A
13
. By the motor A
9
to drive the driving gear A
10
for driving the driven gear A
11
. By the motor A
9
, the driving gear A
10
is driven for further driving the driven gear A
11
, and then by rotation of the driven gear A
11
, the female screw gear on the four tie bar A
4
are driven so that the rear platen A
3
will move with the seat of the movable platen A
2
. Therefore, the object of mold adjusting is achieved and it can be used by molds with different thickness. The ejector apparatus B includes an ejector plate B
1
, an ejector hydraulic cylinder B
2
. By the moving of an ejector piston B
4
, the ejector rod B
3
also move therewith so that the object of separating a product from a mold is attained.
As described above, the conventional mold clamping apparatus of an injection molding machine means uses a hydraulic cylinder means as a power source. Therefore, the hydraulic pump, valves, oil circuits, etc. in the mold clamping apparatus will increment the complexity thereof. The operation of the mold clamping is controlled by hydraulic pressure. Thus, the control is very complex and can not be performed exactly. In order to drive the toggle mechanism means to act, the hydraulic pump must be operated continuously for generating a required hydraulic pressure. Moreover, in order to retain a required pressure, a large energy must be consumed. Besides, conventional mold clamping apparatus of an injection molding machine has a problem of oil pollution which is undesired by peoples.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a mold clamping apparatus for effectively improving the defects in the conventional injection molding machine, such as large power consuming, difficult in maintenance and positioning for substituting the conventional hydraulic power source. Therefore, the structure can be simplified and positioning precision is incremented so that power is saved and oil pollution is avoided.
Another object of the present invention is to provide the mold clamping apparatus of an injection molding mechanism. Other than improving the aforesaid defects of conventional mold clamping apparatus, since two timing belts are used instead of single belt as in the prior art design. Since two symmetric ball screw with two timing belts are used instead of two belts, the unbalance of tension and the timing difference from the driving of ball screw are avoided. Moreover, since symmetric ball screw are used, the mold clamping forces are built. Therefore, the precision and stability of products are improved.
Accordingly, the present invention provides a mold clamping apparatus for an injection molding machine means mainly includes a servo motor installed at the center of the rear platen and two timing belts to drive two ball screw rear platen so as to push a five point inward bending toggle mechanism to open mold, close mold and clamping mold. Moreover, the servo motor fixed to the lateral side of the movable platen drives the nuts to rotate so as to push the ball screw, ejector rod and ejector plate to move linearly for achieving the object of ejecting. A electromotive motor on the rear platen will drive the mold adjusting means. By the assisting of the servo motor on the rear platen, the function and object of automatic mold adjusting can be achieved rapidly.


REFERENCES:
patent: 5190714 (1993-03-01), Reinhart
patent: 5370524 (1994-12-01), Liang et al.
patent: 5648103 (1997-07-01), Takanohashi
patent: 5843496 (1998-12-01), Ito et al.
patent: 6024560 (2000-02-01), Ito et al.
patent: 6050804 (2000-04-01), Tamaki et al.

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