JPS6327225A - Injection molding machine - Google Patents

Abstract

PURPOSE:To enable the title machine to unload resin molded products to be obtained every shot by connecting them reliably with each other, by a method wherein the molded product is unloaded upward of a split mold by removing the molded product from a stopper pin of a carrier rest, a tail end side of the molded product is inserted into a receiving groove of the split mold by connecting the tail end side of the molded product with the receiving groove and then injection molding of the next molded product is performed. CONSTITUTION:When a carrier rest 15 faces to a split mold 11, a molded product 20 is removed from a mold by an ejector pin 111 of the split mold 11 and sent to stopper pins 154a-154c of the carrier rest 15, a feed hole 21 is fitted over the stopper pin and the molded product 20 is delivered to the carrier rest 15. When the carrier rest 15 is moved upward and the molded product 20 arrives at the top dead center, the stoper pin 154c of the carrier rest 15 comes to a matched position with a stopper pin 113 of the split mold 11. The pin 113 is fitted in the feed hole 21 of a tail end side of the molded product 20 under that state, the tail end side is inserted into a receiving groove 112 of the split mold 11 and the molded product 20 is supported again by the split mold. Then the next molded product 20' is formed by injecting molten resin by clamping the split molds 10, 11. The molten resin is welded to the tail end side of the molded product 20 inserted into the receiving groove 112 and the molded products 20, 20' are connected with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an injection molding machine configured such that resin molded products individually formed for each one shot can be successively connected and taken out.

Conventional technology Conventionally, when molding a case or a cap (hereinafter referred to as a "molded product") that encases an electronic component such as a piezoelectric vibrator with resin, it is usual to form each piece separately using injection molding. .

To assemble electronic parts using these molded products, the molded products are dropped from an injection molding machine into a receiver, and after checking the quantity, they are packed into boxes or magazines.Furthermore, in the assembly process, each molded product is removed from the box. Necessary circuit parts must be assembled inside each molded product by sifting them into a parts feeder or sequentially arranging them from a magazine and feeding them individually into an automatic assembly machine. Therefore, it is necessary to rely on humans to perform quantitative inspection of molded products, and it is necessary to manually transfer parts to parts feeders and pack them into magazines, which is extremely time-consuming to handle. When supplying molded products individually, there is a risk that a situation in which supply cannot be made due to mistakes in identifying the front and back sides of the molded products or failures may occur, which may impede smooth assembly work.

Instead of this, it is conceivable to hold each molded product by inserting a tape member made of paper, resin, metal, etc. having pitch feed holes at regular intervals during production of the molded product to form a multi-stranded product. In this case, it becomes easier to control the quantity and supply of molded products, but the molded products may be contaminated with foreign matter from the tape member, and the positional relationship between each molded product and the sprocket hole may be inaccurate. It is difficult to set it to 1F,
Moreover, it is not preferable because the equipment becomes complicated and the mold is likely to wear out.

Problems to be Solved by the Invention In order to eliminate these disadvantages, a carrier tape section in which pitch feed holes are carved at regular intervals in the longitudinal direction for each shot is integrally molded with the case and cap from the same resin. It is only necessary to perform injection molding such that these molded products are successively connected by carrier tape portions to form a multi-strand structure.

Means for Solving the Problems In the injection molding machine according to the present invention, there is provided a receiver for inserting the tail end of the molded product that has been previously locked onto the split mold side from which the molded product is removed from the mold using the eject bin of the mold. A groove is provided to be continuous with the cavity groove, and a locking pin that engages with a feed hole formed near the tail end of the molded product is provided protruding from the inner surface of the groove, and faces oppositely to this split mold side at the bottom dead center. A carrier stand is arranged so as to be movable up and down, and several locking pins are provided protruding from the front side of the carrier stand to engage with each feed hole of the molded product. It is configured such that the stopper is mounted so as to be able to come into contact with the stopper, and the stopper that protrudes from the lower side of the carrier base can be aligned with the stopper on the split mold side as the carrier base moves upward.

Function: In this injection molding machine, when a molded product formed in one shot is removed from the split mold using an eject bin, the carrier table is moved downward to face the split mold, and the molded product is removed from the mold using the eject bin and molded at the same time. A stopper is inserted into the feed hole of the product, and the molded product is received by the carrier stand.The carrier stand is moved upward until the stopper on the lower side aligns with the stopper on the split mold, and then stopped. Then, a part of the molded product is taken out above the split mold by removing it from the stop bin on the carrier stand, and the tail end of the molded product is locked with the stop bin on the split mold side. If you insert it into the receiving groove of the split mold and then injection mold the next molded product in the cavity groove that is continuous with the mold, you can weld and connect the tail end and starting end of each molded product. It becomes possible to sequentially connect and take out molded products that are individually formed in one shot during molding.

Embodiments will now be described with reference to the accompanying drawings.

The injection molding machine shown in FIG.
0 and 11 are horizontally suspended guide bars 12 and 13, which are attached so that they can move toward or away from each other. In addition, each separate mold has grooves on the opposing surfaces that join together to form a cavity space for injecting molten resin, and each cavity groove is relatively vertical and has feed holes spaced apart at a predetermined interval to form a molded product. It corresponds to the shape. These split molds 10. As shown in FIG.
..., and a receiving groove 112 is formed continuously above the cavity groove 110 into which a part of the molded product can be inserted. Furthermore, at least one retaining pin 113 is protruded from the plane of the receiving groove 112 and engages with a feed hole of the molded product.

A carrier stand 15 is attached above the split mold 11 via a stand-up frame 14, as shown in FIG. The carrier stand 15 is connected and supported by a drive cylinder 16 that moves downward to the bottom dead center corresponding to the split die 11, and is mounted so as to be movable up and down by fixing the drive cylinder 16 to the rising frame 14. In addition to the drive cylinder 16, the carrier stand 15 is equipped with a drive cylinder 17 having a relatively short stroke. As shown in FIG. 3, the drive cylinder 17 is a slider 15 that is fitted and supported by a guide frame 150 of the carrier base 15 so as to be movable up and down.
1, and is attached so that the slider 151 can be moved upward by a predetermined stroke while keeping the carrier stand 15 stationary at the bottom dead center. This slider 15
1 has a bottle holder 15 via a drive cylinder 152.
3 is attached so that it can move forward and backward. The pin holder 1
53 is a plurality of retaining pins 15 that fit into the feed holes of the molded product.
The fixing pins 154a to 154c are mounted on the plate surface of the pin holder 153 at vertically spaced intervals so as to be able to engage with predetermined feed holes of the molded product. ing. Also, slider 1
51 through the pin holder 153 and drive cylinder 15.
An extrusion plate 156 connected at 5 is provided so as to be movable back and forth, and retaining pins 154a to 154c are inserted through the plate surface of the extrusion plate 156 with their tips protruding forward. The carrier platform 15 described above is provided with stopper bolts 157 that come into contact with appropriate locations on the fuselage 18 to restrict the downward movement of the drive cylinder 16, and a positioning pin 158 is provided at the bottom of the carrier platform 15.
can be configured to be attached and engaged with a receiver 115 formed on the bottom plate 114 of the split mold 11 at the bottom dead center.

In the injection molding machine configured in this way, the fourth
It can be used to form a molded article 20 as shown in the figures. The molded product 20 is one in which a plurality of components 24, such as external cases or caps for electronic components, are integrally molded on the left and right sides, and are connected by a carrier tape section 22 in which feed holes 21 are carved at regular intervals, and a liner section 23.23. The part shown by the solid line can be formed by a one-shot operation using the split molds 10 and 11.

Now, once one molded product 20 has been injection molded, the split molds 10 and 11 are moved apart from each other to split the mold.

At this time, the split mold 10 can remove a part of the excess runner that is generated due to resin injection into the mold, and the split mold 11 can move the molded product 20 away from the mold to a predetermined position while keeping it fixed in the cavity groove 110. It is supposed to be done. Split mold 10,
11 moves to a predetermined position and stops, carrier stand 1
5 descends to the bottom dead center facing the split mold 11 as shown in FIG. 3 by extending the stroke of the drive cylinders 16 and 17. In this state, the eject pin 111 protrudes from the split mold 11 to remove the molded product 20 from the mold, and at the same time, the feed holes 21 are inserted into the stop pins 154a to 154C protruding from the pin holder 153 of the carrier stand 15. Then, the molded product 20 is transferred to the carrier stand 15 as shown in FIG. At this time, if the drive cylinders 152 and 155 are moved to extend their strokes and the stop pins 154a to 154C are moved forward until they come into contact with the split mold 11, the molded product 2
0 can be reliably delivered to the carrier stand 15. When the carrier table 15 receives the molded product, the drive cylinders 152 and 155 are moved backward, the drive cylinder 17 is moved to reduce its stroke, and the slider 151 is moved upward along the guide frame 150. Due to the upward movement, the molded product 20 is partially moved upward from the split mold 11 held by the slider 151 of the carrier stand 15. Further, when the slider 151 reaches the top dead center, the stop pin 154C located on the lower side of the carrier base 15 is aligned with the stop pin 113 of the split mold 11, as shown in FIG.

When the drive cylinder 115 is moved to extend its stroke in this state, the extrusion plate 156 moves forward and hangs the molded product 20 from the stop pins 154a to 154c, thereby moving the molded product 20 toward the split mold 11 side. At this time, the drive cylinder 152 of the bottle holder 153 is also moved to extend its stroke along with the drive cylinder 155, and the stop pin 154c is
113 may be brought into contact with each other, and by fitting their tips into each other as shown in FIG. 7, they can be accurately positioned with respect to each other. The molded product 20 removed from the stoppers 154a to 154c as the extrusion plate 1560 advances is inserted into the stopper 1 of the split mold 11 in the feed hole 21 on the tail end side.
13 is fitted in, and the tail end side is inserted into the receiving groove 112 of the split mold 11, so that it is supported by the split mold 11 again. When this transfer is completed, the carrier table 15 returns to its original position above by reducing the stroke of the drive cylinder 16, and waits until receiving the next lowering signal. Furthermore, the molded product 20 that has been partially lifted upward is gradually moved backward via tension roller groups 18a, 18b, 18c, etc. as shown in FIG. ) to wind it up and hold it.

When the split mold 11 receives the molded product 20 by locking its tail end side with the stop pin 113 and inserting it into the receiving groove 112, the mold receives the next molded product 20' shown by the two-dot chain line in FIG. In order to resin mold the mold, the split molds 10 and 11 are moved close to each other and clamped.

At the same time as the mold clamping, molten resin is injected into the cavity space of the mold, and this molten resin also flows into the receiving groove 112 that is continuous with the cavity groove 110 of the split mold 11, and the molded resin inserted in the receiving groove 112 is injected. It is welded to the tail end side of the product 20. By welding, the previously formed molded product 20 and the newly formed molded product 2
0' are connected to each other. In order to ensure this connection, as shown in FIG. 8, about four small holes 25 are provided on the tail end side of the molded product 20, and the holes 25 are filled with holes for the next molded product 20'. It is preferable to inject and harden the 8-melt resin. Also, as shown in FIG. 9, if the diameter of the opening 25 increases from the back side to the front side (α1 < α2), the molded product 2
From the point where the 0' molten resin interlocks and hardens, an extremely strong connection can be achieved.

Although the above-mentioned embodiment shows a case in which one strip of molded product is connected and molded, by forming a plurality of molded products at the same time in a mold, a plurality of strips of molded products can be taken out in parallel. In addition, although resin cases and caps for electronic components are exemplified as molded products, the present invention can also be applied to injection molding of various resin molded products.

Effects of the Invention As described above, according to the injection molding machine according to the present invention, resin molded products individually molded in one shot can be reliably connected and taken out in sequence.

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing an injection molding machine according to the present invention, Fig. 2 is a perspective view showing a split mold on one side of the molding machine, and Fig. 3 is an explanation of the configuration of a carrier stand attached to the molding machine. 4 is a plan view showing an example of a molded product manufactured by the same molding machine, FIGS. 5 and 6 are explanatory diagrams of the operation of the carrier stand, and FIG. 7 is a partial sectional view showing the contact structure of the stop pin. FIGS. 8 and 9 are explanatory diagrams showing the connection structure of molded products. 10.11: Split mold, 110: Cavity groove, 111: Eject bin, 112: Receiving groove, 113: Stopping bin, 15
: Carrier stand, 16.17: Cylinder for driving carrier stand, 151 Nislider, 152: Cylinder for driving locking pin, 153: Pin holder, 154a to 154c: Locking pin, 155: Cylinder for driving extrusion plate, 15
6: Extrusion plate. Patent applicant TDC Co., Ltd.
Daiwa Leather Co., Ltd. Figure 5 Figure 7 Figure 9 Figure 6 Figure 8

Claims (2)

[Claims] (1) An injection molding machine that uses a mold that can be divided into left and right parts to form a relatively vertically elongated molded product having feed holes spaced apart at a predetermined interval in order to form a removable product, and the eject pin of the mold. A receiving groove for inserting the tail end of the molded product that was previously locked on the split mold side from which the molded product is removed from the mold is provided in continuity with the cavity groove, and a groove is provided on the inner surface of the receiving groove near the tail end of the molded product. A retaining pin that engages with the formed feed hole is provided protrudingly, and a carrier stand that faces the split mold side and the bottom dead center is arranged so as to be movable up and down, and each feed of the molded product is placed on the front side of the carrier stand. In addition to protruding a plurality of retaining pins that engage with the holes, the retaining pin on the lower side of the carrier base is attached so as to be able to come into contact with the retaining pin in the receiving groove, and the retaining pin protruding from the lower side of the carrier base An injection molding machine characterized by being configured so that it can be aligned with a stop pin on a split mold side as the carrier table moves upward. (2) The injection molding machine according to claim 1, wherein the carrier table is provided with an extrusion plate that is movable forward and backward and moves forward toward the tip of the stop pin.