JPH0153616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection molding machine in which a plurality of support plates can operate independently of each other.

(Prior art) A conventional injection molding machine has a first protruding plate and a second protruding plate.
An ejector pin is provided on each ejector plate, and when taking out a product, first raise the first ejector plate located on the movable mounting plate side, and then use the ejector pin to move the sprue runner, etc. The product was removed by lifting the first ejecting plate, pushing up the second ejecting plate, and activating the ejecting plate pin to eject the product.
−25452).

(Problem to be Solved by the Invention) According to the conventional example, the operation of the second ejecting plate is the same as that of the first ejecting plate.
As a result, the operation of the second ejecting plate is dependent on the operation of the ejecting plate, and there is a problem in that the operation of the second ejecting plate is restricted.

An object of the present invention is to enable a plurality of support plates to function independently of each other.

(Means for Solving the Problems) In the injection molding machine of the present invention, a plurality of support plates 9, 10 are arranged with a predetermined gap therebetween, and the plurality of support plates means at least two. The gap between the support plate 9 closer to the movable template and the support plate 10 closer to the movable attachment plate, which constitute these two support plates, is equal to or greater than the moving distance of the support plate 10 closer to the movable attachment plate. That is, even if the support plate 10 closer to the movable side mounting plate moves a predetermined distance to perform its function, both support plates 9 are moved by a distance that does not push out the support plate 9 closer to the movable side template plate. , 10 are far apart. Push the support plate 9 near the movable mold plate to one of the extrusion rods 13,
22, the support plate 10 near the movable mounting plate can be moved forward and backward independently of each other by the other push rods 18 and 24. The two extrusion rods 13, 22, 18, 24 are arranged coaxially. Operating pins 14 and 15 and an operating pin 19 project from each of the support plates 9 and 10 toward the movable mold plate 2, respectively. Operation pin 1
4, 15, and 19 include ejector pins, sprue lock pins, push-out rods, etc., and at least one of the operation pins on each support plate is an ejector pin.

(Function) Each extrusion rod 13, 18, 22, 24 is actuated by the drive means 12, 17, 21, 23, and this operation causes the support plate 9 near the movable mold plate and the support near the movable side mounting plate to be moved. The plate 10 moves forward and backward, and along with this, the operation pins 14 and 1
Although the movement of each support plate is the same as that of 5 and 19, the movement of each support plate does not follow the other, but is independent of each other, and the movement of each support plate can be controlled at the same time or at different times. It can be carried out. In addition, extrusion rods 13, 18, 22,
Since 24 is coaxial, space efficiency is improved.

(Example) Examples of the present invention will be described below based on the drawings.

In FIG. 1 showing the first embodiment, a fixed side template 1 and a movable side template (2) are in contact with each other, the fixed side template 1 is attached to the fixed side mounting plate 3, and the movable side template 2 is attached to the receiving plate. They are respectively attached to a movable side attachment plate 6 via a plate 4 and a spacer block 5. Fixed side template 1
A sprue bush 7 is provided on the side, and a nozzle 8 for injection molding is located at the upper end opening of the sprue bush so as to be movable up and down above the fixed side mounting plate 3. A cavity is formed between the stationary template 1 and the movable template 2.

Incidentally, in the spacer block 5 below the movable mold plate 2, a first ejector plate 9 and a second ejector plate 10, both of which constitute a support plate, are positioned facing each other with a predetermined gap therebetween. The upper first ejector plate 9 moves up and down (forward and backward) as the first ejector rod 13, which is an extrusion rod of the cylinder 12 positioned on the receiving portion 5a and supported by the frame 11, expands and contracts. be. First ejector plate 9
The first ejector pin 14 is an operating pin from the top surface.
and a sprue lock pin 15 protrude, and both pins pass through the receiving plate 4 and are movably inserted into the movable mold plate 2 to lock the first molded product 16a and the sprue runner attached thereto. 16b can be protruded.

The lower second ejector plate 10 is located on the movable mounting plate 6 and moves up and down as the second ejector rod 18, which is an extrusion rod of the cylinder 17 supported by the frame 11, expands and contracts. The second ejector plate 10 is located apart from the first ejector plate 9;
The distance from the ejector plate 9 is such a distance that the first ejector plate 9 will not be pushed out even if it moves forward.

A second ejector pin 19, which is an operating pin, protrudes onto the second ejector plate 10, and this second ejector pin passes through the first ejector plate 9 and the receiving plate 4, and can freely move the core 20 in the movable side plate template 2. , and the second molded product 16c can be projected from the upper end.

The second ejector rod 18 and the first ejector rod 13 are coaxially located, and the first ejector rod 13 passes through the cylinder 17 and is movably inserted into the second ejector rod 18.

Next, the effect will be explained.

The cavity is filled with liquid synthetic resin from the nozzle 8, and after the filled synthetic resin is cooled and solidified,
The movable sides such as the movable template 2 and the receiving plate 4 are moved back. Therefore, the first molded product 16a and the second molded product 16
If you want to take out the first molded product 16a first, first drive the cylinder 12 to extend the first ejector rod 13, protrude the first ejector pin 14 from the movable mold plate 2, and remove the first molded product 1.
6a and the sprue runner 16 attached to it
b and the movable side mold plate 2. Then, by driving the cylinder 17, the second ejector rod 1
8 is stretched, the second ejector plate 10 is raised, the second ejector pin 19 is projected from the upper surface of the core 20, and the second molded product 16c is separated from the movable mold plate 2.

Note that when the second molded product 16c is taken out first, the second ejector plate 10 is operated first. The order of operation of the first and second ejector plates 9 and 10 is selected as appropriate.

A second embodiment will be described with reference to FIG. Note that in this example, the same reference numerals are used for parts corresponding to those in the above example.

In this example, the second ejector rod is movably inserted into the first ejector rod. That is, the first ejector rod 22 is expanded and contracted by the operation of the cylinder 21 supported by the frame 11, and the diameter of the first ejector rod is increased. A second ejector rod 24 operated by the cylinder 23 passes through the cylinder 21 and is movably inserted into the first ejector rod 22. A pair of operating cams 2 are bent outward in an arc shape at the upper end of the second ejector rod 24.
5 and 25 are attached with pins 26 and 26 as swing centers, and the second ejector plate 10 is raised and lowered via these operating cams. operating cam 25,
25 is given a spring force so as to expand outward, but the expansion angle is regulated by a stopper (not shown) so as not to expand beyond a predetermined angle. An operating cam 2 is provided on the outer peripheral surface of the first ejector rod 22 from the bottom to the top of the movable side mounting plate 6.
The guide groove 22 allows the parts 5 and 25 to expand outward.
a, 22a are provided facing each other. Guide groove 22
The length of a, 22a is the ejection stroke of the second ejector rod 24. The diameter of the rod insertion hole 6a provided in the movable side mounting plate 6 is the same as the operating cam 25,
It is set to a size that does not interfere with the operation of 25.

The effect in this example will be explained.

When the first molded product is taken out, the first ejector rod 22 is operated. In this case, the second ejector rod 24 and the operating cam 2
Due to the presence of 5, 25, the first ejector rod 22
operation is not hindered. When taking out the second molded product, when the second ejector rod 24 is extended from the position shown by the solid line in FIG. Since the second ejector plate rises by contacting the lower surface of the second ejector plate 10 and further extending the second ejector rod 24, the second ejector pin 19 protrudes the second molded product. In this case, the operation of the second ejector rod 24 and the operating cam 25 is not hindered by the guide groove 22a.

(Effects of the Invention) As explained above, according to the present invention, a plurality of support plates can operate independently of each other, and any one of the support plates does not restrict the operation of the other support plate. The operating order can be changed arbitrarily in advance or during driving. Since the extrusion rods are arranged coaxially, space efficiency is improved and it can be accommodated even within the narrow space of the mold clamping mechanism.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment, and FIG. 2 is a sectional view showing a second embodiment. 1... Fixed side template, 2... Movable side template, 3...
Fixed side mounting plate, 6... Movable side mounting plate, 9...
Support plate (first ejector plate), 10
...Support plate (second ejector plate),
12...Cylinder, 13...Extrusion rod (first
Ejector rod), 14... Operating pin (first ejector pin), 15... Operating pin (sprue lock pin), 16a... First molded product, 16c...
Second molded product, 17...Cylinder, 18...Extrusion rod (second ejector rod), 19...Operation pin (second ejector pin), 21...Cylinder,
22...Extrusion rod (first ejector rod),
22a...Guide groove, 23...Cylinder, 24...
...Extrusion rod (second extruder rod), 25
...Operating cam.

Claims (1)

[Claims] 1. At least two parts separated by a gap.
two support plates 9, 10; push-out rods 13, 22 for moving the one support plate 9 forward and backward; and push-out rods 18, 24 for moving the other support plate 10 back and forth.
and operation pins 14 and 15 protruding from the one support plate 9, and the other support plate 1.
The support plates 9 and 10 are separated by a gap that does not interfere with each other's movements, and the extrusion rods 13, 22, 18, and 24 are coaxially arranged. The operation pin 19 of the other support plate passes through one support plate, and at least one of the operation pins 14 and 15 of one support plate and the operation pin 19 of the other support plate. An injection molding machine characterized in that the operating pin is an ejector pin.