JPS62235723A - Resin sheet slitting mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting mechanism for cutting thin resin sheets.

An example of this technological resin sheet is the separator used in electric double layer capacitors. That is, as shown in FIG. 5, an electric double layer capacitor includes an insulating separator 51 having ion permeability sandwiched between a pair of polarizable electrodes 52 and 52, and an insulating layer around each polarizable electrode 52 and 53. The structure includes gaskets 54 and 55 made of rubber. In this electric double layer capacitor, the separator 51 is formed by punching out, for example, a circular shape from a thin microporous resin sheet having a thickness of 25 μm.

Conventional means for cutting this type of thin resin sheet into a predetermined shape include the following methods. Namely, ■Tokuko Sho 60
As disclosed in Japanese Patent Publication No. 18136, a means for placing a resin sheet to be cut on an adhesive sheet and pressing an annular cutting blade against the resin sheet while rotating it.

■As shown in FIG. 6, prepare a gasket 61 having a through hole, apply an adhesive 62 to the surface of the gasket surrounding the through hole, paste a resin sheet 63 on top of it, and in this state place the gasket 61 on a stage 64. Means for melt cutting by pressing the cutting edge 66 of a heated cutting blade 65 placed on top of the resin sheet 63 (proposed by the present applicant in Japanese Patent Application No. 60-234326). Punch 7 as shown
Means using punching molds 1 and 2 (in the figure,
73 is a resin sheet).

Problems caused by trying to resolve (2) By the way, with the conventional method (2) above, since the cutting edge rotates, the cutting shape is limited to a circle, and it is not possible to cut into other shapes, and the mechanism is This method is complicated, the cutting edge is severely worn out, and the resin sheet cannot be cut individually.

On the other hand, in the conventional method (2), the cutting edge does not involve rotation, so it can be cut into any shape, the mechanism is simplified, and there is less wear and tear on the cutting edge. There is a disadvantage that it cannot be cut by itself.

In addition, if the cutting edge descends below the resin sheet, it may damage or cut the gasket, so the amount of descent of the cutting blade must be controlled so that only the resin sheet is accurately cut. There is also the problem that if the circumference is not level, there will be uncut areas.

With the conventional method (2), the punch goes into the die, so the levelness of the cutting edge is not a problem, but the problem is that the clearance between the punch and the die must be extremely small, 1 to 3% of the thickness of the resin sheet. There is. That is, if the resin sheet thickness is about 25 μm, the clearance must be set to 1 μm or less, and with such a small clearance, the mold becomes very expensive, and the cutting edge is severely worn out, making maintenance difficult. . In addition, even if you try to use a batch production method in which multiple sheets of a predetermined shape (for example, circular) are simultaneously punched from a large area resin sheet, it is necessary to attach the multiple punches to the mold while maintaining the above-mentioned small tolerances. However, there is a problem in that it is difficult to implement because of the difficulty in processing accuracy.

An object of the present invention is to provide a new and useful cutting mechanism that can solve all of the above problems.

To achieve the above object, the resin sheet cutting mechanism according to the present invention includes a stage on which the resin sheet is placed, and a cutting pattern of the sheet in plan view. The stage has a cutting blade having a cutting edge in a shape corresponding to the outer peripheral edge and is heated to a temperature higher than the softening point of the resin sheet, and a suction hole for vacuum suctioning the resin sheet is formed on the stage. An escape groove is formed in a region corresponding to the periphery of the cut figure, and with the resin sheet adsorbed and fixed on the stage by vacuum suction, the cutting edge of the cutting blade is penetrated into the escape groove on the stage, and the resin sheet is placed in a predetermined position. It is characterized by cutting into the following cutting shapes.

Since the resin sheet is held on the stage by vacuum suction, the resin sheet can be cut individually. Furthermore, since the resin sheet is cut using a cutting blade, there is no need for severe tolerances as in the punch and die punching method, and there is a comparatively high degree of leeway. Therefore, it is advantageous in terms of cost and wear of the cutting edge, and the batch production method can also be implemented without much difficulty in terms of manufacturing accuracy.

Furthermore, since the resin sheet is cut by the cutting blade entering the relief groove on the stage, there will be no uncut portion even if the cutting edge is not level.

Figure 1 shows a resin sheet cutting mechanism according to an embodiment of the present invention, in which 1 is a cutting blade and 2 is a stage. The cutting blade 1 is provided so as to be movable up and down by a lift drive mechanism (not shown). The cutting edge 3 at the lower end of the cutting blade 1 has a shape corresponding to the outer peripheral edge of the cut figure of the resin sheet in plan view. In this embodiment, since the cutting pattern is circular, the cutting edge 3 has a circular shape in plan view. Further, the cutting edge 3 is a single-edged blade having an inclined portion 3a on the outside, as shown in an enlarged view in Fig. 3.4. At least the cutting edge 3 of the cutting blade 1 is heated to a predetermined temperature higher than the softening point of the resin sheet by a heating means (not shown) and kept warm.

On the other hand, the stage 2 has a flat upper surface with a moderate degree of smoothness, and a large number of suction holes 5 are scattered on the upper surface. Each suction hole 5 is connected to a vacuum pump (not shown), and the resin sheet (A) placed on the upper surface of the stage is suctioned and fixed by the suction action of the vacuum pump.

The diameter of the suction holes 5 is sufficiently small to prevent the resin sheet from entering the suction holes 5 during suction and causing wrinkles.

An escape groove 6 is also formed on the stage 2 at a portion corresponding to the periphery of the sheet cutting pattern. In this embodiment, the cutting pattern is circular, so the relief groove 6 is circular as shown in FIG.

The shaded part in Figure 2 is the shape of the cutting figure (circle)
It represents. The width W of the relief groove 6 is determined to be an appropriate dimension in relation to the thickness of the cutting edge 3 of the cutting blade. In this embodiment, the distance is set to 0.75 m. The depth d of the escape groove 6 is determined as appropriate in relation to the horizontality of the cutting edge 3 of the cutting blade. That is, even if the levelness of the cutting edge 3 is poor, the depth of the relief groove 6 is set so that the entire circumference of the cutting edge 3 fits into the relief groove.

In this example, 1. It is set to Qmm.

The procedure for cutting the resin sheet A with the above configuration will be explained. First, a large area of uncut resin sheet is placed on stage 2)
A is placed on the stage, and the resin sheet A is suctioned and fixed on the stage by the suction action of the vacuum pump.

Next, the cutting blade 1 is lowered until the entire circumference of the cutting edge 3 enters into the clearance groove 6, as shown in FIG.

Then, the resin sheet A covers the cutting edge 3 and the inner wall 6a of the relief groove 6.
Due to two factors: the cutting action between
It is cut into a predetermined cut shape (circular in the case of the embodiment).

In this case, the cutting is done with a cutting blade, so punch and gui.

Unlike the punching method, the cutting edge 3 and the relief groove inner wall 6
The clearance (S in FIG. 4) can be set large. According to experiments, in the case of the conventional punch and die method,
The result was that good punching could not be achieved unless the clearance was set to 1 μm or less, but in the example of the present invention, even if the clearance was set to 100 μm, cutting could be performed with sufficient accuracy.

For this reason, the molds are inexpensive and wear and tear on the cutting edges is low, and the batch-type production method, in which many cutting blades are arranged in a matrix or the like to cut many resin sheets at the same time, does not require high processing precision in the molds. It can be carried out with

Further, since the cutting blade 1 does not need to be rotated, the resin sheet can be cut into a desired shape, and the mechanism itself is simplified.

Furthermore, the resin sheet can be cut by the cutting edge 3 of the cutting blade entering the relief groove 6 on the stage 2, so even if the cutting edge 3 is not level, it can be completely cut without leaving any cut residue. can.

Incidentally, a representative example of the resin sheet used in the above embodiments is a separator for an electric double layer capacitor, but it goes without saying that the resin sheet is not limited thereto.

Since the resin sheet cutting mechanism according to the present invention is constructed as described above, it has the following effects.

■Since the resin sheet is adsorbed onto the stage and cut, it is possible to cut only the resin sheet alone.

This means that, for example, when used as a separator for an electric double layer capacitor, the manufacturing method of the electric double layer capacitor is no longer restricted by the production of the separator.
This has the effect of being able to be manufactured using the most desirable method.

■As mentioned in the example, it is possible to create a large clearance between the cutting edge and the inner wall of the relief groove, which brings about many benefits such as the cost of the mold, the degree of wear of the cutting edge, and the realization of a batch-type production system. .

■Since the cutting edge penetrates into the relief groove and cuts, it is possible to cut resin sheets even if the cutting edge is not level.
It is possible to cut resin sheets with high precision without having to control the amount of descent of the cutting blade very strictly.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram showing a resin sheet cutting mechanism as an embodiment of the present invention, FIG. 2 is a plan view of the stage, FIG. 3 is a diagram showing the state during cutting, and FIG. 3 is an enlarged view of a part of FIG. 3, FIG. 5 is a view showing an example of how a cut resin sheet is used, and FIGS. 6 and 7 are views showing a conventional cutting mechanism, respectively. 1... Cutting blade, 2... Stage, 3... Blade tip, 5
...Suction hole, 6...Escape groove, A...Resin sheet. Patent applicant: Mura Co., Ltd. 1) Manufacturing site Figure 1 Figure 2 Figure 1, l Figure 3 Figure 4 a Figure 5 J Figure 6 Figure 7

Claims (1)

[Claims] A stage on which a resin sheet is placed, and a cutting blade having a cutting edge having a shape corresponding to the outer periphery of a cut figure of the resin sheet in plan view and heated to a temperature equal to or higher than the softening point of the resin sheet, and A suction hole is formed on the stage to vacuum-suction the resin sheet, and an escape groove is formed in a portion corresponding to the periphery of the sheet cutting figure. A resin sheet cutting mechanism characterized by cutting a resin sheet into a predetermined cutting pattern by penetrating the cutting edge of a blade into a clearance groove on a stage.