JPS5933966B2 - How to wind a capacitor element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for winding a capacitor element, and more particularly to a method for winding a capacitor element in which electrode foils and separators are alternately stacked and wound.

For example, electrolytic capacitors are made by alternately stacking electrode foils made of aluminum film and insulating paper, or separators, and unwinding them to create a capacitor element, and then inserting the capacitor element into a case. .

In this way, the aluminum film, that is, the electrode foil, used in the manufacture of capacitor elements is usually made by cutting a wide raw film into a desired width using a slitter a as shown in Figure 1. Burrs are generated on the side edges of the foil (called foil) due to cutting.

Moreover, this streamer is generated in a state in which it protrudes in a direction substantially perpendicular to the surface of the electrode foil.

In this case, when such an electrode foil and a thin separator are overlapped and wound, the burrs pb of the electrode foil f are wedged into the separator S and are separated from the similar burrs b of the opposing electrode foil, as shown in FIG. A problem arises in that contact occurs and short circuits occur between the electrode foils.

Especially in recent years, the thickness of separators has become thinner and thinner.
For example, in the case of a small electrolytic capacitor, it is 30 to 20 microns (
Conventionally, a material with a thickness of 50 microns or a rough texture has been used, increasing the risk of short circuits caused by the wire.

Therefore, an object of the present invention is to provide a novel capacitor element winding method that solves the above-mentioned problems and winds the capacitor element without short circuits.

The method for winding up a capacitor element according to the present invention is characterized in that the edges 9 of the electrode foil are flattened by pressing them with a pressure roller, and the film is wound up while being pressed with a pressure roller.

Embodiments of the present invention will be described below with reference to the drawings.

3 to 5, a final winding device for carrying out the winding method of the present invention is shown.

In the figure, 1 is the turret of the capacitor element winding machine, 2 is the rotation axis of the turret, and 3 is a plurality of pieces arranged at equal intervals around the turret, and the turret is rotated in the direction of the arrow X to center around the rotation axis. A core 4 is formed at the tip of the core 3, and electrode foils f1 t f2 and separators S1 . A groove S2 is inserted through, 5 is a first cutting device for cutting one of the electrode foils f1, and 6 and 7 are guide rollers for guiding the electrode foil and the separator.

The tip of the winding core 3 can move forward and backward from the front of the turret.

A main body 11 of a second pressing device 100 for carrying out the winding method of the present invention is disposed close to the turret 1 so as to be movable toward the center of the turret.

At the lower end of one side (right side in FIG. 3) of the main body 11, there is a cutter die 1 close to the winding core 3 at the first winding position A.
2 is formed.

A slider 13 is rotatably attached to the main body 11 at its lower end and has a pressure roller 14 having a width l' narrower than the width of the electrode foil.
and a tension roller 16 narrower than the electrode foil at the lower end.
A slider 15 is rotatably attached to the slider 15 so as to be slidable up and down.

Sliders 13 and 15 have springs 17 and 18, respectively.
is being suppressed downward.

The slider 13 is arranged so that the pressure roller 14 can press the electrode foil etc. wound around the core at the second winding position.
Positioned above the winding core, the slider 15 is positioned approximately at the center between the first winding position and the second winding position.

Reference numeral 19 denotes a plate that is fixed between adjacent winding cores on the front surface of the turret, and cooperates with the tension roller 16 to hold the rear end of the electrode foil, etc., which is wound at the second winding position 13. It has the effect of clamping the material and applying tension through frictional resistance.

In front of the turret 1, a cutter 8 is provided movably in the direction of arrow Y at a position corresponding to the cutter die 12, and the cutter 8 and the cutter die 12 separate the electrode foil fs and the separator S1. It is designed to disconnect from S2.

A burr crushing device 20.20 is installed on the upstream side of the electrode foil.
A is provided.

Each crushing device is composed of a feed roller 21 that is fed and driven in connection with the operation of the winding device, and a crushing roller 22 that is pressed against the feed roller 21 by a spring 23.

As shown in FIG. 5, the crushing roller 22 has an annular groove 220 formed on the outer periphery of the center, and electrode foil f1 t only on both side edges.
f2 and crush the burrs b on both sides of the electrode foil or flatten them to the same surface as the surface of the electrode foil.

Next, a winding method according to the present invention will be explained with reference to FIGS. 3 to 5.

Electrode foil f1 + pulled out from a roll cut into a predetermined width by a slitter and wound into a predetermined size.
f2 is the crushing roller 21 of the crushing device 20, 20a
After being flattened by the separators S, , S2 and a pair of guide rollers 6.7 which are stacked alternately, the tip is placed in the groove 4 of the winding core 3 at position A.

Next, the winding core 3 rotates for a predetermined amount, and then the rotation of the winding core stops, and the turret 1 intermittently rotates about 60° in the direction of arrow □, move to position B while pulling out s2.

Thereafter, the cutter 5 acts to cut the electrode foil f1.

Next, the main body 11 moves slightly downward and the pressure roller 14
While pressing the electrode foil etc. wound around the winding core, move to position B.
When the rear end of the electrode foil f1 cut off by the cutter 5 has advanced slightly from position C to position B, the rotation of the winding core is stopped.

FIG. 1 shows that the winding of a predetermined amount of electrode foil, etc. at the second winding position B has been completed, and that the electrode foil f2 (fl has already been cut by the cutter 5) and the separators S, S2 have been cut. Shows the state immediately before execution.

That is, when the winding at the second winding position is completed, the main body 11 of the second cutting device is lowered until the lower end of the cutter die 12 is at the position shown in the solid line, and thereby the sliders 13 and 15 are also lowered. do.

For this reason, the pressure roller 14 presses the wound electrode foil etc. at the second winding position, and the tension roller 16 presses the electrode foil etc.
9 to clamp the electrode foil and apply tension.

In this state, the electrode foil etc. passing through the first winding position are
Since the receiver comes to cross straight across the center of the winding core at that position by the action of the plate 19 and the tension roller 16, it is aligned with the direction of the groove of the winding core 3, which has been retracted from the front surface of the turret.

When the winding core continues to protrude forward, an electrode foil or the like is inserted through the groove 4.

The winding core 3 is then rotated slightly counterclockwise, for example by 30° to 60°.

Next, the cutter 8 moves in the direction of arrow Y to cut the electrode foil f1 and the separators S1 p S2.

At this time, since the electrode foil and the like are wound at the second winding position and pressed by the pressure roller 14 and the tension roller 16, the tension does not suddenly loosen after being cut.

When the above-mentioned cutting is completed, the core at the second winding position rotates again while pressing the electrode foil etc. with the pressure roller and the tension roller, and winds up the remaining portion.

During this time, the main body is slightly raised (compared to when cutting) so that the lower surface of the cutter die is in position, but the pressure roller and tension roller are pressing the electrode foil etc. by the action of the spring.

On the other hand, the winding core at position A also rotates, and the electrode foil at position f1.
f2, separator S1. Winding of S2 is performed.

Note that when the winding core, which has been wound with a predetermined amount of electrode foil, etc., moves from position A to position B, the tip of the electrode foil A 1 is located closer to the rear end of the electrode foil F that was previously wound and cut by the cutter 5. The cutter 8 is fed by a known feeding mechanism with a slight delay (separately).
When cutting the electrode foil, etc., the position AK is approximately at the center of the winding core.As is clear from the above description, the winding method of the present invention provides the following effects.

(a) Capacitors with high reliability can be manufactured without the electrode foil causing short circuits. (b) Insulating paper can be made thinner, so small capacitors with good performance can be manufactured.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing how the electrode foil is cut by a slitter, Fig. 2 is an enlarged view showing the conduction state between the electrode foils when using the conventional end-of-life inspection method, and Fig. 3 is a diagram showing the winding and method according to the present invention. FIG. 4 is a schematic diagram of the apparatus for carrying out the process, and FIG.
- Enlarged view along IV, Figure 5 is line V-■ in Figure 3
FIG. 1... Turret, 3... Winding core, 10
... Pressure device, 14 ... Pressure roller,
16...Tension roller, 20, 20a...
...Burr crushing device, 22...Crushing roller, f, f,, f2...Electrode foil, S, Sl, S
2...Separator.

Claims (1)

[Claims] 1. In a method for winding a capacitor element by alternately overlapping and winding electrode foils and separators to form a capacitor element, the edge of the electrode foil is flattened by a roller and the winding is performed. A method for winding a capacitor element, which is characterized by winding an electrode foil, etc. wound around a core while compressing it. 2. A method for winding a capacitor element according to claim 1, characterized in that the pressure roller is pressed only at the central portion, which is narrower than the width of the electrode foil.