JPS6217221Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an injection molding machine for hollow elastic molded products, and in particular to an injection molding machine that uses the elastic force of the molded product to eject the product from the mold.

Conventionally, when molding a hollow elastic body made of synthetic resin such as silicone rubber, such as a boot that is attached to the base of a movable member to prevent the intrusion of foreign substances such as dust and the diffusion of oil droplets, there is a gap between the upper and lower molds. A stripper plate is interposed in the mold, and when the mold is opened, the molded product is engaged with the stripper plate by the undercut portion of the molded product and separated from the lower mold, and then the molded product is manually removed. Therefore, it was common practice to strip it off the stripper plate.

However, the above-mentioned work to take out the molded product has the disadvantage that the molded product can be damaged to a large extent, and it is labor-intensive because it is manual work, and the work is done at the mold opening position, and outside the frame. Since the molded product cannot be taken out at the working position, there is also the problem that the work becomes complicated.

The purpose of this invention was to take into account the problem of taking out molded products due to the structure of the injection molding machine based on the above-mentioned conventional technology, and to provide a structure in which a take-out head having a suction tip at the bottom can be brought into contact with and removed from the stripper plate. By doing so, it is an object of the present invention to provide an excellent injection molding machine for hollow elastic molded products, which eliminates the above-mentioned drawbacks and eliminates the difficulties, and allows the molded product to be taken out extremely easily and efficiently. be.

The structure of this invention in accordance with the above purpose is that, for a hollow elastic molded product that is engaged with an opened stripper plate at an undercut portion, a suction member provided at a take-out head is moved into a hollow space of the molded product. The undercut portion of the molded product is separated from the stripper plate by inserting the molded product into the stripper plate and applying suction force to bring the molded product into close contact with the suction member.
The gist is that the molded product can be taken out by pulling up the suction member in this state.

Next, an embodiment of this invention will be described below based on the drawings.

FIG. 1 shows the mold opened after molding at the injection position, with a core 2 hanging vertically on the upper mold 1, and a core 2 on the table 3 facing the upper mold 1. A lower mold 4 is provided at the position where the mold 4 is formed, and a mold engraving space 5 is formed in the lower mold 4. A stripper plate 6 is interposed between the upper and lower molds 1 and 4, and the stripper plate 6 is integrally provided with the lower mold 4 so as to be openable and closable. Move as one. The molded hollow elastic molded product 7 is provided with an undercut portion 8, where it is engaged and held by the stripper plate 6 and detached from the lower mold 4. Note that 9 is a hollow space in the molded product 7, and 10 is a positioning recess formed in the stripper plate 6.

As shown in FIGS. 2 and 3, a take-out head 11 is provided above the stripper plate 6 at the molded product take-out position so as to be movable up and down. A suction tip 12 is installed vertically at the bottom of the take-out head 11, and the shape of the suction tip 12 is such that it can be inserted into the hollow space 9 of the hollow elastic molded product 7 when the take-out head 11 is lowered. It is becoming. Further, the suction tip 12 is provided with a suction hole 13, and the suction hole 13 is provided at a position that opens into the hollow space 9 when the suction tip 12 is inserted into the molded product 7. , is preferably provided near the undercut portion 8 of the molded product 7. The suction hole 13 communicates with an air pump (not shown) through an air passage 14 formed in the suction tip 12 and the take-out head 11.

A positioning protrusion 1 is provided on the bottom surface of the take-out head 11.
5 is provided, and the stripper plate 6
It aligns with the positioning recess 10 of. Further, the take-out head 11 is supported via an arm 16 by appropriate means so as to be rotatable and movable up and down.

In the above configuration, after the molding operation is completed at the injection position shown in FIG. 1, the mold is opened and the upper mold 1 is pulled upward, and the stripper plate 6 is pulled up from the lower mold 4. At this time, the molded product 7 engages with the stripper plate 6 through its undercut portion 8, and leaves the molding space 5 of the lower die 4 while being held there.

Next, the lower mold 4 and the stripper plate 6 are moved together by the table 3 to the molded product removal work position shown in FIG. There is no upper die in the upper space of the take-out work position, and the take-out head 11 in the retracted position is rotated by appropriate means.
The mold is brought to the unloading work position and positioned directly above the lower die 4 and the stripper plate 6. Then,
Lowering the extraction head 11 from the upper position,
It is brought into contact with the stripper plate 6. At this time,
Both are accurately positioned and aligned by the positioning protrusion 15 and the positioning recess 10. When the two are in contact with each other, the suction tip 12 of the take-out head 11 is deeply inserted into the hollow space 9 of the molded product 7.

Thereafter, when a vacuum is applied to the suction hole 13 through the air passage 14, the air in the hollow space 9 of the molded product 7 is sucked out, so that the molded product 7 is elastically deformed, as shown in FIG. It comes into close contact with the suction tip 12.
At this time, the undercut portion 8 of the molded product 7 and the stripper plate 6 are disengaged.

Next, when the take-out head 11 is raised, the molded product 7 is removed from the stripper plate 6 while being in close contact with the suction tip 12.

Then, the take-out head 11 is rotated by the arm 16 and moved from the take-out position to another working position, such as a chute, where the suction tip 1 is moved.
By cutting off the vacuum suction force to 2 and blowing out air as necessary, the molded product 7 is transferred to the suction tip 1.
It is to be removed from 2 and collected.

As for the means for moving the lower mold and the stripper plate between the injection position and the molded product take-out position, it goes without saying that any method such as a rotary table method or a shuttle method can be employed.

As mentioned above, according to this invention, a stripper plate is interposed between the upper and lower molds, and when the mold is opened, the molded product is engaged and held by the stripper plate. In an injection molding machine, by providing a take-out head with a suction tip connected to a vacuum source, the stripper plate, which is moved together with the lower mold to the molded product take-out position, is rotated and lowered. The take-out head is brought into contact with the molded product from above at the molded product take-out position, the suction tip is inserted into the hollow space of the molded product, and a vacuum is applied to the tip to apply suction to the molded product to reduce its elasticity. This allows the undercut of the molded product to be removed from the stripper plate by elastically deforming it and bringing it into close contact with the suction tip, allowing molding with a high yield without damaging the molded product in any way. This has the excellent effect of making it possible to take out items.

Moreover, since the work does not rely on manual labor, there is an advantage that work efficiency is significantly improved.

Furthermore, by rotating, raising and lowering the take-out head and moving it out of the frame, the molded product can be ejected at any working position outside the frame, allowing the molded product to flow smoothly to the next process. There is also the advantage of being

In addition, since the molded product is brought into close contact with the suction tip by elastic deformation of the molded product due to the vacuum suction force, the shape of the suction tip does not necessarily need to be precisely aligned with the internal shape of the molded product. It has the practical benefit of being easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an injection molding machine to which this invention is applied when the mold is opened, and FIGS. 2 and 3 are explanatory diagrams of the operation of an embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Upper mold, 4... Lower mold, 6... Stripper plate, 7... Molded product, 8... Undercut part, 9... Hollow space, 11... Take-out head, 1
2... Suction chip, 13... Suction hole, 14... Air path.

Claims (1)

[Scope of utility model registration request] In an injection molding machine for hollow elastic molded products having an upper mold 1, a lower mold 4, and a stripper plate 6 interposed between the upper and lower molds, the stripper plate A take-out head 11 is provided which can be raised and lowered from above to come into contact with and release from the handle.
A suction tip 12 that can be inserted into the hollow space 9 of the molded product 7 is attached to the lower part of the take-out head, and the suction tip 12 is provided with a suction hole 13 that opens into the hollow space 9. An injection molding machine for hollow elastic molded products.