JPH0547461Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a method for manufacturing electrolytic capacitors using aluminum (hereinafter referred to as aluminum) foil, which serves as a capacitor element, and the tab of a lead wire that makes an electrical connection to the aluminum foil. This invention relates to a stitching connection device for connecting.

(B) Prior Art A conventional stitching connection device for connecting an aluminum foil and a tab by piercing them with a stitching needle is disclosed in, for example, Japanese Patent Laid-Open No. 52-54160. This conventional connecting device uses a square pyramid-shaped stitching needle that presses a pressing plate that is compressed by a spring against the terminal. is pierced into the drawer terminal and the aluminum foil halfway through its pointed part to form a burr on the drawer terminal and the aluminum foil, and the burr is pushed up with a punch to crimp the drawer terminal and the aluminum foil.

By the way, in recent years, electrolytic capacitors have become smaller and the width of the lead terminals, or lead wire tabs, has also increased.
It is smaller at 0.08mm to 1.2mm, and the presser foot during stitching connection is also smaller accordingly. When attempting to connect such tabs with a small presser foot with a conventional stitching connection device, as shown in Fig. 4, when the stitching needle is inserted into tab T and aluminum foil F, the tab may be partially retracted as shown in P. The aluminum foil is also pulled in as it is pulled in, and when the burrs caused by the stitching needle are crushed, cracks appear in the aluminum foil f, as shown in FIG. If such a crack c occurs in the aluminum foil, there is a problem that not only the mechanical strength of the connection between the tab t and the aluminum foil f becomes weak, but also the electrical resistance increases.

(c) Problems to be solved by the invention The problem to be solved by the invention is to improve the structure of the tab holding member in the stitching connection device so that cracks can occur in the aluminum foil even when the tab has a small presser allowance. The aim is to make it possible to connect without any problems.

(d) Means for Solving the Problems The present invention provides a stitching needle that is pointed in the shape of a polygonal pyramid and that pierces aluminum foil and tabs, a pilot hole tool in which a hole is formed to receive the stitching needle, and the pilot hole. In a stitching connection device that includes a tab holding member that presses the aluminum foil and the tab toward the tool, and a die that crushes burrs caused by the stabbing of the stitching needle, the tab side surface of the holding member is The tab is formed with projections and depressions to prevent the tab from slipping with respect to the presser member.

(e) Effect In the above configuration, the aluminum foil and tab are pressed toward the pilot hole tool by the tab holding member. Then, the uneven surface of the tab holding member comes into strong contact with the surface of the tab and firmly holds the tab. In this state, pierce the tab and aluminum foil with the stitching needle. Burrs are generated by the piercing of the stitching needle, and the burrs are crushed by a die to connect the two.

(f) Examples Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of the part of the stitching connection device of the present invention in which the stitching needle pierces the aluminum foil and the tab. In the figure, 1 is a stitching needle with a pyramid-shaped portion 2 formed at the tip (lower end in the figure), 3 is a pilot hole tool with a hole 4 having a square cross section for receiving the stitching needle 1, and 5 is a stitching needle. A hole 6 through which the needle 1 passes is formed, and it is a tab holding member that holds down the aluminum foil f and tab t placed on the pilot hole tool 3. The lower surface of the tab holding member 5 is provided with an uneven structure in which a large number of small square pyramid-shaped projections 7 are arranged side by side. The hole 6 of the pilot hole tool 3 is considerably larger than the diameter of the stitching needle so that burrs b on the aluminum foil and tab can be easily formed. Note that the die for crushing the burr is the same as the conventional die, so a description thereof will be omitted.

In the stitching connection device having the above configuration, after placing the aluminum foil f and the tab t on the pilot hole tool 3 in alignment with the hole 4, the tab holding member 5 is lowered and the tab t and the aluminum foil f are placed on the pilot hole tool 3. Press it towards the person. Then, the projection 7 formed on the lower surface of the tab holding member 5 bites into the upper surface of the tab t, making it uneven as shown in FIG. 3, and the tab is prevented from moving with respect to the tab holding member.

After that, when the stitching needle 1 is lowered and pierces the tab t and the aluminum foil f, a triangular burr b of the tab and the aluminum foil is formed in the hole 4 of the pilot hole tool 3 due to the action of the square pyramid part 2 of the stitching needle. be done. At this time, the protrusion 7 of the tab holding member bites into the tab and prevents the tab from moving relative to the tab holding member, thereby preventing the tab from being pulled in when the stitching needle is inserted.

Next, the stitching needle 1 and the tab holding member 5 are raised, and the pilot hole tool 3 is lowered, and the holed part is sent to another position or a second hole is placed at the same position.
The burr b is crushed by a pair of upper and lower dies 8 and 9 as shown in the figure to complete the connection.

(G) Effects According to the present invention, since it is possible to firmly hold the tab when piercing with a stitching needle, it is possible to improve the strength and performance of a capacitor with a small diameter connecting portion.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the part of the stitching connection device according to the present invention that pierces the stitching needle, Fig. 2 is a side view of the part of the stitching connection device that crushes the burr, and Fig. 3 is the same as that shown in Fig. 1. FIG. 4 is a plan view of the tab when the stitching needle is inserted using a conventional device; FIG. 5 is a plan view of the tab when the stitching needle is inserted using the conventional device; FIG.
This figure is a partial view seen from the opposite side of FIG. 4, and shows a state in which cracks occur in the aluminum foil. 1...Stitching needle, 2...Square pyramid part, 3
...Preparation hole tool, 4...hole, 5...tab holding member,
7... Protrusion.

Claims (1)

[Scope of utility model registration request] A stitching needle that is pointed in a polygonal pyramid shape and pierces the aluminum foil and the tab, a pilot hole tool that has a hole for receiving the stitching needle, and a tab that presses the aluminum foil and the tab toward the pilot hole tool. In a stitching connection device comprising a presser member and a die for crushing burrs caused by piercing of the stitching needle, a surface of the presser member on the tab side has an unevenness that prevents the tab from slipping with respect to the presser member. A stitching connection device characterized in that: