JPH0246040Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] After the element is inserted into the opening of the case of the electrolytic capacitor, the opening is sealed with a rubber sealing plug. A large number of these sealing plugs are integrally molded on a rubber sheet in advance.
The present invention relates to a sealing rubber sheet in which a large number of sealing plugs are formed in this manner.

[Conventional technology]

FIG. 2 is a cross-sectional view of an electrolytic capacitor, in which an element 2 of the electrolytic capacitor is housed in a case 1, and then the opening is sealed with a sealing plug 3 made of rubber.
The two lead wires 4 and 5 are drawn out from a through hole previously opened in the sealing plug 3.

As disclosed in Japanese Unexamined Patent Publication No. 59-149018, a large number of sealing plugs 3 are integrally molded on one sheet 9 before sealing, as shown in FIG. 3A.
B is a sectional view of the sealing plug 3 on the rubber sheet 9, and the sealing plug 3 has two lead wire insertion holes 7 and 8 opened in advance. The sealing plugs 3 are punched out one by one from the rubber sheet 9 having a large number of sealing plugs 3 as described above, and used for sealing the case 1. In FIG. 3A, the holes 10 are formed after the sealing plugs 3 are punched out from the rubber sheet 9.

FIG. 4 is a sectional view of an apparatus for punching out a sealing plug 3 from a rubber sheet 9 and mounting it on an element of an electrolytic capacitor. The rubber sheet 9 is held by a holder 11 and fed intermittently. A guide block 13 disposed below the die 12 has a socket 15 for the sealing plug 3 and tapered holes 17 and 18 separated by a partition plate 16 directly below the cylindrical hole 14 of the die 12. There is. A cylindrical guide 1 is placed above the die 12.
A punch 20 that moves up and down inside the punch 9 is disposed.

To mount the sealing plugs 3, when the sealing plugs 3 of the rubber sheet 9 are transferred onto the die 12, the punch 20 is lowered and the shearing action between the punch 20 and the die 12 removes one of the sealing plugs 3. The sealing plug 3 that has been separated from the rubber sheet 9 is press-fitted into the socket 15 with a punch 20. Next, guide block 13
slides horizontally with respect to the dice 12 and retreats from the dice 12. Then, the two lead wires 4 and 5 of the electrolytic capacitor element 22 held by the gripping claws 21 are inserted into the tapered holes 17 and 18. When the element 22 further rises, the lead wires 4 and 5 are inserted into the corresponding lead wire insertion holes 7 and 5 of the sealing plug 3, respectively.
8 is inserted. At this time, the lead wires 4 and 5 are
Although they protrude from the guide block 13, since they are retracted from the die 12 as described above, the lead wires 4 and 5 do not come into contact with the upper member or the like.

When the sealing plug 3 is mounted on the element 22 in this way,
Next, after being transferred to the process, the guide block 13
is opened into two parts, and the element 22 and the sealing plug 3 are inserted into the case.

[Problem that the invention attempts to solve]

In this way, the sealing plug 3 is shear-punched one by one from the rubber sheet 9 using the die 12 and the punch 20, so after about 80,000 to 100,000 punching operations, the die 12 and the punch 20 wear out and become unusable. . This means that it becomes unusable due to the amount of work done in one day.

This rubber sheet 9 is manufactured in the rubber manufacturing industry, supplied to capacitor manufacturers, and used by punching out as shown in FIG. Therefore, there is a demand from capacitor manufacturers to provide a rubber sheet that can extend the life of the die 12 and punch 20. As shown in FIG. 3C, it has been proposed to provide a concave groove 23 on one side to facilitate punching, but this does not significantly extend the life of the tool. The technical problem of the present invention is to solve such problems with conventional rubber sheets with sealing plugs, and to realize a rubber sheet for sealing electrolytic capacitors that can extend the life of dies and punches when punching from the rubber sheet 9. It's about doing.

[Means for solving problems]

FIG. 1 is a diagram showing the basic structure of a rubber sheet for sealing an electrolytic capacitor according to the present invention, in which A is a plan view and B is a cross-sectional view taken along a line in FIG. The rubber sheet 9 of the present invention has a configuration in which arc-shaped notches 24 are made at the positions on the outer periphery of each sealing stopper 3 at positions where they are separated from the rubber sheet 9. This cut 24 penetrates from the front surface to the back surface of the rubber sheet 9, as shown in FIG. Moreover, a plurality of notches 24 are formed so as to surround the sealing plug 3. A portion between adjacent notches 24, 24 where the notch 24 is interrupted serves as a bridge portion 25, and the sealing plug 3 is integrally connected to the rubber sheet 9 via this bridge portion 25.

[Effect]

Each of the sealing plugs 3 is cut in advance at an arc-shaped cut 24 at a separation position between the outer periphery and the rubber sheet 9 when the sealing plug is used, and is connected only by a bridge portion 25. Therefore, when a capacitor manufacturer uses the sealing plug 3 to seal an electrolytic capacitor, it is sufficient to cut only the bridge portion 25, which reduces wear on the cutting edge of the cutting die and punch, and extends the life of the capacitor. .

Rather than arranging the bridge portions 25 at the same position relative to the sealing plug 3 for all of the rubber sheet 9, by arranging them at different angles with respect to the center of the sealing plug 3, only the same positions of the die and punch are worn out. By preventing this and allowing uniform wear around the entire circumference, longer life can be achieved.

〔Example〕

Next, examples will be used to explain how the rubber sheet for sealing an electrolytic capacitor according to the present invention is actually implemented. FIG. 5 is a plan view showing an embodiment of the rubber sheet for sealing an electrolytic capacitor according to the present invention. In the x1 row, bridge portions 25 are provided at positions of 0 degrees, 90 degrees, 180 degrees, and 270 degrees with respect to the x axis. On the other hand, in the x2 column, 45 degrees, 135 degrees, 225 degrees
It is located at an angle of 315 degrees. Also, in the x3 row, there are four locations: 22.5 degrees, 112.5 degrees, 202.5 degrees, and 292.5 degrees, and in the x4 row, 67.5 degrees, 157.5 degrees, 247.5 degrees, and 337.5 degrees.
They are installed in four locations.

In this way, the life of the die and punch can be further extended by not providing the bridge portions 25 in all the sealing plugs 3 at the same location but at different angles.

FIG. 6 is a sectional view showing various embodiments of the notch 24. The means for forming the notch 24 is not particularly limited, and the notch 24 is formed using a knife as shown in A.
It may also contain 4a. Alternatively, as shown in (b), a slit-shaped cut 24b having a width d may be formed during molding of the sealing plug 3. Of course, by punching, there are 2 slit-shaped cuts.
4b may be formed, but this must be done at a stage before being supplied to the capacitor manufacturer, which is the user.

Further, as shown in FIG. 3C, a groove 23 may be formed along the entire outer circumference of the sealing plug 3 as shown in FIG. 3C, and a cut 24c may be provided on the groove 23.

The material of the sealing plug 3 may be synthetic rubber such as butyl rubber or natural rubber. In addition, synthetic resin or the like may be used as long as the material has elasticity similar to that of rubber. Therefore, in this specification, "rubber" includes all rubber-like elastic bodies.

[Effect of idea]

As described above, according to the present invention, before the rubber sheet 9 with the sealing plug 3 is supplied to the capacitor manufacturer that is the user, a plurality of arc-shaped notches 24 are formed on the outer periphery of each sealing plug 3 at the separation position. are provided, and are connected to the rubber sheet 9 only at bridge portions 25 between the notches 24. Therefore,
When a capacitor manufacturer uses the sealing plug 3 after separating it from the rubber sheet 9, the load on the die or punch is reduced, and reduction in life due to wear of the cutting edge can be prevented. In particular, by providing the bridge parts 25 at different positions rather than at the same position so that the bridge parts 25 come into contact with different positions of the cutting edge of the die or punch, the life can be further extended.

[Brief explanation of the drawing]

Figure 1 is a plan view and a sectional view explaining the basic principle of the rubber sheet for sealing an electrolytic capacitor according to the present invention.
Fig. 2 is a sectional view of an electrolytic capacitor, Fig. 3 is a perspective view and a sectional view of a conventional rubber sheet for sealing an electrolytic capacitor, and Fig. 4 is a sectional view of a sealing plug separation device.
FIG. 5 is a plan view showing an embodiment of a rubber sheet for sealing an electrolytic capacitor according to the present invention, and FIG. 6 is a sectional view showing various embodiments of cutting cuts. In the figure, 3 is a sealing plug, 4 and 5 are lead wires,
9 is a rubber sheet, 12 is a die, 20 is a punch,
24, 24a, 24b, 24c are notches, 25
indicate the bridge portions, respectively.

Claims (1)

[Scope of utility model registration request] In a rubber sheet 9 on which a large number of sealing plugs 3 of an electrolytic capacitor are integrally formed, arc-shaped notches penetrating both the front and back surfaces are formed in advance between the sealing plugs 3 and the rubber sheet 9. 3. A rubber for sealing an electrolytic capacitor, characterized in that, when used for sealing an electrolytic capacitor, the connecting portion 25 between adjacent notches is cut so that the sealing plug 3 can be separated from the rubber sheet 9. sheet.