JPH0216501Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to an ejecting mechanism for a mold, and particularly to an ejecting mechanism for a mold body having a thin wall structure and an insert component.

(b) Background of the Technology Figure 1 is an enlarged perspective view for explaining a method for mass producing coil bobbins to be incorporated into small electromagnetic relays.

In FIG. 1, a bobbin 1 consists of a molded body 2 made of electrically insulating plastic and a pair of coil connection lead terminals 3.
The bent portion of the letter-shaped lead terminal 3 is inserted into one flange of the molded body 2. In order to mass-produce the bobbin 1 configured as described above, a strip 4 formed by pressing a hoop material to connect a large number of lead terminals, that is, a U-shaped terminal 5 with both ends of the lead terminal 3 extended, is connected to the connecting member 6. A method has already been put into practical use in which a molded body 2 is formed by forming a strip 4 connected to the mold body 4 and inserting each of the opposing corner portions of a pair of terminals 5, and then cutting off unnecessary portions 7 and 8 of the terminal 5. There is.

(c) Prior art and problems FIG. 2 is a diagram for explaining the main structure and operation of the mold for forming the molded body 2 mentioned above.
The mold 11 is composed of an upper mold plate (fixed mold plate) 12, a lower mold plate (movable mold plate) 13, and a pair of side mold plates 14. The lower mold plate 13 moves up and down, while the side mold plate 14 moves downward. Template 1
It comes to slide back and forth along the top surface of 3.

FIG. 2A is a side cross-sectional view after the mold is closed and molten resin is injected into the cavity, and the cavity constituted by template plates 12 to 14 forms the mold body 2. At that time, the strip 4 introduced into the mold 11 is attached to the lower mold plate 13.
It is designed to be fixed in the thickness direction of the paper along the top surface of the paper.

FIG.
It descends with 3.

FIG. 2C is a side sectional view of a pair of side mold plates 14 slid toward the outside of the mold, and as a result, the side mold plates 14
The engagement with the mold body 2 is released.

FIG. 2 D is a side sectional view of the molded body 2 after being ejected, and the plurality of eject pins 15 passing through the lower molding plate 13 rise to push the molded body 2 upward and into the center of the lower molding plate 13. The mold body 2 comes to come out from the protruding core pin 16.

Thereafter, the strip 4 is run by a predetermined pitch in the thickness direction of the paper, and then the mold is closed, and by repeating the above mold operation, a large number of molded bodies 2 are successively formed on the strip 4. The bobbin 1 is completed by cutting off the unnecessary parts 7 and 8.

However, when the mold body in such a mold becomes smaller and thinner, the flange of the mold body protruded by the eject pin becomes deformed or damaged, so an eject mechanism different from the conventional mold structure is required. It became like that.

(d) Purpose of the invention The purpose of the invention is to provide a mold that meets the above requirements.

(e) Structure of the invention The above object is achieved by the invention, which consists of an upper mold plate, a lower mold plate, a pair of side mold plates, and a guide plate having a pair of guide rails at the tips, and the lower surface of the upper mold plate is connected to the upper surface of the cavity. The upper surface of the lower mold plate has grooves into which a pair of guide rails of the guide plate are fitted from above on the left and right sides of the cavity center, and the guide plate can move up and down together with the lower mold plate and independently. The upper surface of the at least one guide rail constitutes the lower surface of the cavity together with the upper surface of the lower mold plate, and the opposite end surface of the side mold plate that can slide from the outside toward the center along the upper surface of the lower mold plate forms the lower surface of the cavity. make up the sides,
The guide rail is inserted into the groove of the lower mold plate, and the side mold plate slides toward the center.The lower surface of the upper mold plate and the upper surface of the side mold plate then come into contact, and the mold is closed to form a cavity. This is achieved by a molding die characterized in that the mold is opened by raising the guide plate after the side mold plate slides outward following the lowering of the plate.

(f) Embodiment of the invention The structure and operation of a mold according to an embodiment of the invention will be explained below using drawings.

Fig. 3 is a schematic side sectional view A showing the main structure and the mold closed state of a mold according to an embodiment of the present invention, and a schematic side sectional view B showing the mold open state, and Fig. 4 shows the upper mold plate excluded. FIG. 5 is a perspective view showing the mold in a closed state, and FIG. 5 is a perspective view showing the mold in an open state with the upper mold plate removed. However, the mold is used to attach and form the molded body 2 to the strip 4 mentioned above.

In FIG. 3, the mold 21 includes an upper mold plate (fixed mold plate) 22 and a lower mold plate (movable mold plate) 2 that can move up and down.
3, a pair of side mold plates 24 and 25 that can reciprocate laterally along the upper surface of the convex portion of the lower mold plate 23, and a core pin 26 that can move up and down along a through hole bored in the lower mold plate 23.
The guide plate is composed of a guide plate having guide rails 28 and 29 at its tips that are fitted into grooves provided on the left and right sides of the center of the lower template plate 23. It can move up and down while being fitted into the groove, and can also move up and down independently.

3A and 4, the guide rails 28 and 29 of the guide plate 27 are fitted into the grooves of the lower mold plate 23 from above, the side mold plates 24 and 25 are moved to the center of the lower mold plate 23, and the lower The mold plate 23 is raised so that the upper surfaces of the side mold plates 24 and 25 come into contact with the lower surface of the upper mold plate 22, and the core pin 26 is raised until its upper end surface matches the upper surface of the lower mold plate 23. , a mold body forming cavity is formed.

Therefore, when the molten resin is injected into the cavity, the mold body 2 is formed, but the pair of guide rails 28 and 29 of the guide plate 27 crosses the mold 21 in the horizontal direction (thickness direction of the paper). The strip 4 (not shown) is connected to the rails 28 and 2.
9 in the width direction. However, a part of the upper surface of the rail 28 takes part in forming the cavity, and the connecting member 6 of the strip 4 is interposed between the upper surface of the rail 29 and the lower surface of the side template 25 opposite to the upper surface. inserted.

In such a mold 21, the lower mold plate 23 and the side mold plates 24, 25 are moved vertically and by the same means as in the conventional mold 11 (for example, a connected movement mechanism using a plurality of air cylinders as driving bodies). The guide plate 27, which reciprocates in the left-right direction and moves up and down together with the lower mold plate 23, moves the mold body 2 toward the lower mold plate 2 by driving an air cylinder (not shown) when the lower mold plate 23 descends.
It is designed to move vertically to lift it upwards from 8.

In FIG. 4, numerals 35 and 36 are intermediate shafts for reciprocating the side mold plates 24 and 25, respectively, and 37 and 38 are recesses ( 5), the guide plate 27 includes a main body 30 with a large opening in the center, guide rails 28 and 29 whose ends are connected to the main body with metal fittings 31, and a main body 30.
It is comprised of a cover 33 etc. that covers the recess 32 of 0. A groove 34 bored in the center of the recess 32
The strip 4 derived from the guide rails 28 and 2
9, and is fed intermittently and progressively by the same means as the conventional mold 11.

In FIGS. 3B and 5, after the lower mold plate 23 moves downward, the side mold plates 24 and 25 slide toward the outside of the mold 21 (backward movement), and then the core pin 26 moves downward. When the guide plate 27 is moved upward, the mold body 2 is ejected from the mold 21, and the strip 4 can be progressively fed. At this time, the guide rail 28 pushes up the lower flange of the molded body 2, and the guide rail 29 pushes up the strip 4 whose predetermined portion is inserted into the molded body 2.

Hereinafter, after feeding the strip 4 in pitches and moving the guide plate 27 downward so that the guide rails 28 and 29 fit into the grooves on the upper surface of the lower mold plate 23, the steps shown in Fig. 3A and Fig. 4 will be explained. As explained,
When the side mold plates 24, 25 and the lower mold plate 23 are operated, a new mold body forming cavity is created.

As a result, a large number of molded bodies 2 are successively formed on the long strip 4, and the bobbins 1 are mass-produced by cutting out unnecessary portions 7 and 8 of the strip 4.

(g) Effect of the invention As explained above, according to the invention, the guide plate for running the insert strip ejects the mold body, and the eject pushes up a part of the mold body and the insert strip. The practical effect of facilitating the formation of a mold body in which the mechanical strength is weak due to the thinner wall and the arrangement of the edgy pin is difficult due to the miniaturization is significant.

[Brief explanation of drawings]

Figure 1 is an enlarged perspective view for explaining the mass production method of small coil bobbins with lead terminals inserted, and Figure 2 is a schematic diagram for explaining the main structure and operation of a conventional mold for forming the molded body of the bobbin. 3 is a schematic side sectional view for explaining the main structure and operation of a mold according to an embodiment of the present invention, and FIG. 4 is an upper mold of the mold shown in FIG. 3. FIG. 5 is a perspective view showing the mold in a closed state with the plate removed, and FIG. 5 is a perspective view showing the mold shown in FIG. 3 in an open state with the upper mold plate removed. In the figure, 1 is a coil bobbin, 2 is a mold body, 3 is a lead terminal (insert part), 4 is a strip, 11 and 21 are mold molds, 12 and 22 are upper mold plates, and 13 and 23 are lower mold plates. , 14, 24, 25
27 indicates a side template, and 27 indicates a guide plate.

Claims (1)

[Scope of utility model registration request] It consists of an upper mold plate, a lower mold plate, a pair of side mold plates, and a guide plate having a pair of guide rails at its tips, the lower surface of the upper mold plate forming the upper surface of the cavity,
The upper surface of the lower mold plate has grooves on the left and right sides of the cavity center into which a pair of guide rails of a guide plate are inserted from above, and the guide plate is movable up and down together with the lower mold plate and independently, and has at least one groove. The upper surface of the guide rail constitutes the lower surface of the cavity together with the upper surface of the lower mold plate, and the opposing end surface of the side mold plate that can slide toward the center from the outside along the upper surface of the lower mold plate constitutes the side surface of the cavity. , the guide rail is inserted into the groove of the lower mold plate, the side mold plate slides toward the center, and then the lower surface of the upper mold plate and the upper surface of the side mold plate touch, the mold is closed, forming a cavity, and the lower mold plate is slid toward the center. 1. A molding die characterized in that the mold is opened by raising a guide plate after the side mold plate slides outward following the lowering of the mold plate.