JPH0544106Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a workpiece synchronous lifting and lowering device that is installed in an insert molding machine that sequentially insert molds works that are connected to a strip-shaped workpiece support.

(Prior art) Generally, when molding small-sized insert molded products in large quantities, a hoop material in which the workpiece is connected to a belt-shaped work support is used, and the hoop material is passed between the upper and lower molds of the insert molding machine. In many cases, each workpiece is insert-molded in sequence while the material is transferred in accordance with the molding cycle.

The insert molding machine that performs insert molding using this hoop material is equipped with a loader and an unloader on both sides of the upper and lower molds in the hoop material transfer direction. It is supported and intermittently transferred in conjunction with the opening and closing of the upper and lower molds. Also,
A plurality of positioning holes are formed in the hoop material at equal pitches, and the hoop material is positioned on the lower mold by fitting a plurality of positioning pins provided in the lower mold into the positioning holes. Then, the hoop material is clamped by the closing and clamping of the upper and lower molds, and the workpiece is insert-molded within the cavity defined by the upper and lower molds. When the insert molding is completed, the upper and lower molds are opened, and the eject pin provided in the lower mold is pushed upward to eject the molded workpiece.Then, this molded product is transferred together with the hoop material. It is cut and removed from the hoop material.

(Problem to be solved by the invention) However, in the case of such a conventional device, a part of the work piece that is insert-molded as a hoop material, that is, a molded product, is ejected only by ejecting the eject pin. Because of the heat, the hoop material supported by the loader and unloader on both sides of the upper and lower molds was bent upward during ejection. For this reason, the hoop material is distorted and deformed at the positioning hole where the positioning pin is inserted.
There were problems in that the hoop material workpiece was damaged and the positioning of the workpiece became uncertain, resulting in frequent molding defects.

(Purpose of the invention) Therefore, when ejecting an insert-molded workpiece, the present invention raises the workpieces on both the front and back sides connected to the hoop material in synchronization with the ejecting, thereby preventing damage to the workpiece or poor positioning. The purpose is to eliminate this problem and prevent molding defects from occurring.

(Means for Solving the Problems) In order to achieve the above object, the workpiece synchronous lifting device according to the present invention is used in a device for ejecting a workpiece connected to a strip-shaped workpiece support from a mold of an insert molding machine. , on both sides between the upper and lower molds,
It has a first support member and a second support member that respectively support the supply side and the discharge side of the workpiece support, and the support member moves in parallel in conjunction with a workpiece ejector device driven by a cylinder. It is characterized by being connected by a link mechanism.

(Function) In the present invention, the first support member and the second support member, which are on both sides of the upper and lower molds and support the workpiece support, are connected by a link mechanism that moves in parallel in conjunction with the workpiece ejector device. be done. Therefore, when the workpiece ejector device operates to eject the workpiece, the workpieces connected before and after the workpiece are synchronized together with the workpiece support member by the first support member and the second support member. There is no possibility that the hoop material will be bent and twisted at the positioning part when it is lifted and ejected. As a result, damage to the workpiece and poor positioning are eliminated, and the occurrence of molding defects is prevented.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings.

1 and 2 are diagrams showing one embodiment of the present invention, and the workpiece synchronous lifting device of this embodiment constitutes a device for ejecting the workpiece from the mold of an insert molding machine.

First, the configuration will be explained. In FIG. 1, 1 is a hoop material supplied from a supply roll (not shown), and the hoop material 1 is connected to a belt-shaped workpiece support 2 and a workpiece connected to the workpiece support 2 by pressurization or the like. It consists of 3. The hoop material 1 is wound around a supply roll on the left side of the figure, and is fed in the direction of arrow A between the upper and lower molds 4 and 5, and the workpiece support 2 discharged in the direction of A is wound around a roll not shown in the figure. It is wound onto a take-up roll. At least one of the upper and lower molds 4 and 5, for example, the lower mold 5, has a plurality of recesses 5a of a predetermined shape on the mold clamping surface P side, and the upper and lower molds 4 and 5 are molded by an insert molding machine main body (not shown). When the mold is opened (as shown), the mold is closed, and the mold is clamped, the molding space (cavity) corresponding to the recess 5a is formed.
It has come to be defined as

Also, the hoop material 1 is attached to both sides between the upper and lower molds 4 and 5, that is, the upper mold 4 and the lower mold 5 in the figure.
Hoop material 1 is placed on both sides of the supply direction (direction of arrow A).
A pair of lifting tables 6L and 6R are provided for loading and unloading the mold onto and from the lower mold 5.

As shown in FIG. 2, the lifting tables 6L and 6R are provided with fixing plates 7L and 7L fixed to the insert molding machine body on the supply side and the discharge side of the hoop material 1, respectively.
7R, a plurality of guide pins 8L, 8R attached to the fixed plates 7L, 7R, and the guide pin 8.
It is slidably attached to L and 8R, and the hoop material 1 is attached to A.
It has an elevating plate 9L (first supporting member) and an elevating plate 9R (second supporting member) that are supported so as to be movable in different directions. Lifting plate 9L, 9
Brackets 9a (only one of which is shown) having a substantially U-shaped cross section are fixedly attached to the lower surface of R, and each bracket 9a has a pair of swingable levers 11L and 11R of the same shape. One end of each is engaged. Specifically, the levers 11L, 11
R has rotatable rollers 11a at both ends,
11b, and is swingably supported by the fixed plates 7L, 7R or the insert molding machine body via a bracket S etc. pin-coupled to the intermediate part 11c, and the roller 1 at one end of the levers 11L, 11R.
1a is in rolling contact with the bracket 9a.
Furthermore, the rollers 11b at the other ends of the levers 11L and 11R are similarly rolled into contact with the brackets 12a and 12b at both ends of the arm 12, and the upper and lower molds 4 are moved by the operation of the air cylinder 13 that supports the arm 12. , 5, when the arm 12 moves up and down with the mold open, the length of both arms of the levers 11L and 11R
The elevating plates 9L and 9R are designed to move up and down simultaneously with strokes according to the ratio of l ₁ and l ₂ (l ₁ >l ₂ ).

On the other hand, the lower mold 5 is provided with a plurality of positioning pins 14 and eject pins 15. The positioning pins 14 are fitted into positioning holes (not shown) formed at equal pitches in the hoop material 1 to position the hoop material 1 on the lower mold 5, and as described above, the elevating plates 9L, When 9R moves up and down at the same time, the hoop material 1 between the lifting plates 9L and 9R is positioned or released. The eject pin 15 is driven by a cylinder 16 that uses the same air pressure source as the air cylinder 13, and when the elevating plates 9L and 9R rise, it protrudes into the recess 5a of the lower mold 5 and ejects the insert-molded workpiece 3. When the elevating plates 9L and 9R descend, they sink into the lower mold 5 to form the bottom surface of the recess 5a. That is, the eject pin 15, the cylinder 16, the air pressure source, etc. constitute a work ejector device 17 that ejects the insert-molded work 3 (i.e., the molded product), and the levers 11L, 11R, the arm 12, the air pressure source, etc. A link mechanism 18 configured by a cylinder 13 and the like and connecting the elevating plates 9L and 9R moves the arm 12 in parallel in conjunction with the work ejector device 17, and lifts the eject pin 15.
The hoop material 1 is raised and lowered in a horizontal state in synchronization with the lifting plates 9L and 9R.

The lifting strokes of the lifting plates 9L, 9R are larger than the strokes of the eject pin 15, so that when the lifting plates 9L, 9R rise by a predetermined amount, the eject pin 15 separates from the insert-molded workpiece 3.
In addition, the lifting plates 9L and 9R are provided with guide pins 8.
It stops horizontally at the position where it is stopped by the upper limit stopper 8a attached to L and 8R, and after the hoop material 1 has been transferred by a predetermined amount, it is lowered in a horizontal state by the operation of the link mechanism 18.

Next, the effect will be explained.

First, with the upper and lower molds 4 and 5 open, when the hoop material 1 is transferred by a predetermined amount in the direction of arrow A as shown in FIG. The plates 9L and 9R are simultaneously lowered in a horizontal state, and the hoop material 1 is loaded onto the lower mold 5 and positioned by the positioning pins 14. Next, when the upper and lower molds 4 and 5 are closed and clamped, the hoop material 1 is sandwiched between the upper and lower molds 4 and 5, and cavities corresponding to the recesses 5a are defined. A workpiece 3 is insert-molded using molten resin from the molding machine main body.

Next, when the upper and lower molds 4 and 5 are opened, the cylinder 16 of the workpiece ejector device 17 is actuated by air pressure from the air pressure source, and the insert-molded workpiece 3 is pushed into the recess 5 by the ejector pin 15.
ejected from a. At this time, cylinder 1
6, the air cylinder 13 operates, and the link mechanism 18 urges the lifting plates 9L and 9R to rise in synchronization with the eject pin 15, thereby removing the formed workpiece 3 and the workpieces 3 on the supply side and the discharge side connected thereto. , that is, the hoop material 1 between the lifting plates 9L and 9R is lifted horizontally, and the positioning pin 1
It is unloaded while the positioning by 4 is released. In this state, the hoop material 1 is not bent upward by the protrusion of the eject pin 15, so the hoop material 1 is not twisted at the location of the positioning hole, and the workpiece support 2 and the workpiece 3 damage is reliably prevented.

Next, when the hoop material 1 is transferred by a predetermined amount in the direction A again, the lifting plates 9L and 9R are moved as described above.
At the same time, the subsequent hoop material 1 is lowered and positioned on the lower mold 5 by the positioning pins 14. At this time, the hoop material 1 is not damaged and the horizontally descended hoop material 1 is accurately positioned, so that the next insert molding is normally promoted.

As described above, in this embodiment, the elevating plates 9L and 9R are moved to the eject pin 15 by the link mechanism 18 interlocked with the workpiece ejector device 17.
The hoop material 1 is raised horizontally in synchronization with ejecting the insert-molded workpiece 3, and is lowered horizontally.
Damage to the workpiece 3 and poor positioning are completely eliminated, and defective molding is prevented. In addition, the elevating plate 9
Since rollers 11a are provided on the levers 11L and 11R for raising and lowering L and 9R, smooth raising and lowering is promoted, and the lengths l ₁ and l ₂ of both arms of the lever 11 are such that l ₁ > l ₂ . A small air cylinder 13 with a small stroke can be used.

(Effects) According to the present invention, the first support member and the second support member, which are on both sides of the upper and lower molds and support the supply side and discharge side of the workpiece, are moved in parallel in conjunction with the workpiece ejector device. Since they are connected by a link mechanism, when the workpiece is ejected by the operation of the workpiece ejector device, the workpieces connected before and after the workpiece are synchronized by the first support member and the second support member. It is possible to completely eliminate damage to the workpiece and poor positioning caused by twisting during ejection, and prevent molding defects.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an embodiment of a workpiece synchronous lifting device according to the present invention, and Figure 1 is a front configuration diagram of the main parts of an insert molding machine equipped with the workpiece synchronous lifting device, and Figure 2 is a diagram showing an embodiment of the workpiece synchronous lifting device according to the present invention. FIG. 2 is a perspective view showing the configuration of the workpiece synchronous lifting device. 2...Work support, 3...Work, 4...Upper mold (mold), 5...Lower mold (mold), 9L...Elevating plate (first support member), 9R...Elevating Plate (second support member), 16...Cylinder, 17
...Workpiece ejector device, 18...Link mechanism.

Claims (1)

[Scope of utility model registration request] In a device that discharges a workpiece connected to a strip-shaped workpiece support from a mold of an insert molding machine,
A first support member and a second support member are provided on both sides between the upper and lower molds and support the supply side and the discharge side of the workpiece support, respectively, and the support member is a support member for a workpiece driven by a cylinder. A workpiece synchronous lifting device characterized by being connected to an ejector device by a link mechanism that moves in parallel.