Sensing and reckoning mechanism for injection machine

Details Sensing and reckoning mechanism for injection machine Sensing and reckoning mechanism for injection machine

2001-04-25

2003-09-16

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With indicator, signal, recorder, illuminator, or inspection...

For molding temperature or pressure

C425S149000

Reexamination Certificate

active

06619944

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to an injection unit of the injection machine, which is particularly equipped with a pressure sensor for feedback of a signal so as to control injection operation of the injection machine more precisely.
BACKGROUND OF THE INVENTION
In order to monitor and control injection operation effectively and heighten stability and reliability thereof, a load bearer is usually applied in an injection machine for sensing the injection forward and back pressure during injection operation. More particularly, for driving a servomotor, signal of the load bearer is necessary for control of the injection pressure, the back pressure, and the release-to-retreat force of the injection machine.
In an “auger and injection structure” widely implemented in existing injection machines as shown in
FIG. 1
, a load bearer
39
is arranged to sense the injection gel's pressure and the back pressure effectively, and a release-to-retreat path (A) and a gel-injection path (B) are shown in FIG.
2
. In this structure, a bearing seat
371
is fixedly locked on a depression base
391
, which is locked together with the load bearer
39
and locked directly on a movable depression plate
23
to incur a pressure imposed to the load bearer
39
at the very beginning, thereby and along with a clearance made during assembling, the pressure sensed by the load bearer
39
will somewhat depart from the due value to have badly affected machine's stability and reliability, or the load bearer
39
may become insensitive in response and for output of a correct signal. Moreover, when an auger
17
is driven by a belt pulley
42
to rotate and feed material between a bearing base
46
and the depression plate
23
, the sensed value cannot be read from the load bearer
39
directly to result in distortions or errors. Consequently, neither can an output pressure be reckoned precisely, nor can a successful feedback control be made accordingly.
SUMMARY OF THE INVENTION
The primary object of this invention is to provide a sensing and reckoning mechanism equipped with a load bearer that can sense injection gel's pressure and reckon back pressure of an injection machine precisely.
For more detailed information regarding advantages or features of this invention, at least an example of preferred embodiment will be elucidated below with reference to the annexed drawings.


REFERENCES:
patent: 4961696 (1990-10-01), Yamamura
patent: 5206034 (1993-04-01), Yamazaki
patent: 5209936 (1993-05-01), Ihara et al.
patent: 5997780 (1999-12-01), Ito et al.
patent: 6461139 (2002-10-01), Yokoya et al.

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