Plastic article or earthenware shaping or treating: apparatus – With safety feature
Patent
1994-01-18
1995-10-24
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
With safety feature
425173, 425567, B29C 4520, B29C 4584
Patent
active
054605059
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an injection molding apparatus, more particularly to an injection molding apparatus equipped with a clamping and an injection units disposed opposite to each other.
BACKGROUND ART
In the injection molding apparatus equipped with a clamping and an injection units disposed confronting each other, injection is performed by causing the tip of the nozzle of the injection unit to abut against the dies fixed to the clamping unit. When the dies have been changed, the cylinder assembly of the injection unit has been changed, or when the injection unit has been turned for change of the parts, it is necessary to check, at the time of the nozzle touching operation, whether the tip of the nozzle of the injection unit accurately abuts against the sprue bush of the dies while operating the injection unit manually or at a low speed.
For this purpose, the abutment between the sprue bush and the injection nozzle tip, i.e. the condition of nozzle touch, is conventionally monitored through a clearance formed in the vicinity of the purge shield by an operator looking into the front side of the stationary platen (a surface on the side of the injection unit) from the front side of the clamping unit. However, a point where the sprue bush and the injection nozzle tip abut each other tends to locate in a dark place far inward from the front side of the stationary platen. Thus, it has been difficult for the operator to accurately monitor the condition of abutment.
This difficulty increases as the size of the injection molding apparatus increases, since the size of the stationary platen also increases accordingly. Thus, there has been a possibility of having the resin leaked outside due to improper nozzle touch.
DISCLOSURE OF INVENTION
The present invention provides an injection molding apparatus rendering easier for an operator to monitor abutting condition between the sprue bush and the injection nozzle tip.
According to the present invention, an injection molding apparatus comprises a clamping unit having a movable platen and a stationary platen. The stationary platen has a locating hole into which the sprue of dies is to be located, and at least one monitoring hole extending from the side thereof toward the locating hole, so that the locating hole can be monitored from the side of the clamping unit through this monitoring hole.
The direction of the monitoring hole is determined so that an operator is allowed to monitor the locating hole from at least either of the front and rear sides of the clamping unit.
The monitoring holes may be provided with shutters, the shutters being interlocked with a purge shield so that the monitor hole is opened together with the purge shield when the purge shield is opened. This shutter prevents the gas or resin from blowing off directly toward an operator during the purge operation.
Furthermore, a window may be provided in the purge shield covering the front side of the stationary platen. The window of the purge shield and the monitoring holes are designed to cooperatively allow the operator to monitor the locating hole even during the purge operation of the clamping unit.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a partly sectional side view showing an injection molding apparatus in accordance with a first embodiment of the present invention;
FIG. 2 is a front view showing a stationary platen of the injection molding apparatus shown in FIG. 1;
FIG. 3 is a horizontal sectional view taken along a line III--III of FIG. 2;
FIG. 4 is a side view showing the stationary platen shown in FIG. 2;
FIG. 5 is a transversal sectional view showing an essential part of an injection molding apparatus in accordance with a second embodiment of the present invention;
FIG. 6 is a transversal sectional view showing an essential part of an injection molding apparatus in accordance with a third embodiment of the present invention; and
FIG. 7 is a perspective view showing a purge shield shown in the third embodiment of FIG. 6.
BEST MODE FOR CARRYING OUT THE INVENT
REFERENCES:
patent: 3728057 (1973-04-01), Grundmann et al.
patent: 4950144 (1990-08-01), Watanabe et al.
Patent Abstracts of Japan, vol. 7, No. 203 (M-241) (1348) 8 Sep. 1983 & JP-A-58-101 023 (Matsushita Denki Sangyo K.K.) 16 Jun. 1983.
Patent Abstracts of Japan, vol. 14, No. 231 (M-0974) (4174) 16 May 1990 & JP-A-02-060 723 (Fanuc Ltd) 1 Mar. 1990.
Patent Abstracts of Japan, vol. 14, No. 237 (M-0976) (4180) 21 May 1990 & JP-A-02-063 710 (Fanuc Ltd) 5 Mar. 1990.
Ito Susumu
Nishimura Koichi
Fanuc Limited
Mackey James P.
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