JPH0482695A - Cutting method and cutting device - Google Patents

Abstract

PURPOSE:To maintain stabilized cutting for a long time without producing cracks on the end part of a cut product by making rotary knives slidable in the axial direction of cutter-shafts, and pressing a rotary knife located at the end part of one cutter shaft by a pressurizing means. CONSTITUTION:When rotary knives 3, 3a are made slidably in the axial direction of cutter-shafts 1, 1a, and the rotary knife 3 located at the end part of one cutter-shaft 1 is pressed by a pressurizing means (coil spring) 7, the adjacent rotary knives 3a are rotated while they are pressed by suitable force capable of making rubbing between the knives better. Thus, the clearances between the rotary knives 3 and 3a can be stably maintained at a reasonably very small level, and a sheet as thin as 10mum such as magnetic tape can be cut without producing a part that partially is not cut, or an irregular part ripped off along a cutting line.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cutting method and a cutting device for cutting a thin sheet material such as a magnetic tape to a predetermined width.

Prior Art A conventional cutting device is equipped with a plurality of rotary blades spaced apart from each other on a cutter shaft, as shown in Japanese Patent Publication No. 63-13737, and one of the cutter shafts is connected to a pair of cutter shafts configured in this way. When the outer circumferential side surface of each rotary blade of the shaft and the outer circumferential side surface of each rotary blade of the other cutter shaft slide against each other (the structure in which the meshed rotary blades are fixed) The cutting device is shown.A pair of cutter shafts L1a are sandwiched between each rotary blade 3.
The rotary blades 3.3a are engaged with each other so that the outer circumferential side surfaces of the blades 3.3a slide against each other, and are tightened by nuts 4, 4a.

In this type of device, (3.3
Generally, the width of the spacer 2.2a is set to be slightly larger than the width of the spacer 2.2a.

This dimensional difference becomes the clearance between adjacent rotary blades at the meshing part, and is an important factor that affects the quality of the cut product.In other words, if the clearance is too large, it will be difficult to cut the sheet material, and if the clearance is too small, it will be difficult to cut the sheet material. In this case, it becomes difficult for the outer peripheral side surfaces of adjacent rotary blades 3.3a to slide together.

Problems to be Solved by the Invention This clearance varies depending on the material of the product to be cut and the required quality.Generally, it is set to about several percent of the thickness of the product to be cut. When the product to be cut is plain paper, its thickness is about 100 μm, and the clearance is generally set to about 5 μm. Conventional cutting equipment can cut the product without any problems, but the product to be cut is magnetic tape. When the thickness is about 10μm, the clearance is 0.5μm.
It will be necessary to set it to about m.

The clearance setting limit for conventional cutting equipment is approximately 3 μm due to its mechanical accuracy, and when cutting thin sheet materials with a thickness of approximately 10 μm, such as magnetic tape, there may be parts that cannot be cut or the cutting line may be torn off. It is difficult to cut stably due to the occurrence of uneven areas, etc.Here, we will explain why the clearance setting limit in conventional cutting devices is about 3 μm due to its mechanical accuracy.

The thickness dimensional accuracy error between the rotary blade 3.3a and the spacer 2.2a directly affects the clearance accuracy. Even if this is processed with fairly high precision, an error of about 0.5 μm will occur in each case. Furthermore, when the rotary blade 3.3a and spacer 2゜2a are tightened to the force/interval axis 1.1a, the amount of deflection of the side surface of the rotary blade also directly affects the clearance accuracy. A deflection amount of about 1 μm occurs, and the total mechanical accuracy error that directly affects clearance accuracy is estimated to be about 3 μm.

Therefore, it is difficult to stably cut a thin sheet material with a thickness of about 10 μm.Furthermore, there are the following problems: In other words, sheets made of two or more layers of different materials are laminated. When cutting materials, this processing method is a shearing method using rotating blades that sandwich the upper and lower surfaces of the sheet material. Fig. 4 shows a magnetic sheet obtained by sputtering a magnetic film 16 made of a relatively easily cracked material and having a thickness of 1 μm onto a PET base film 15 having a thickness of 100 μm. Magnetic film 1 at the end of magnetic tape 14 cut with a conventional cutting device
6 shows the appearance of the crack 17 that occurred. The length of the crack 17 reaches several tens of micrometers to several hundred micrometers, which poses a quality problem.The present invention solves the above-mentioned problems in conventional cutting devices.

Means for Solving the Problems The means for solving the above problems are as follows: The rotary blades are made slidable in the direction of the cutter shaft, and the rotary blades at one end of the cutter shaft are pressed by a pressure means, so that each rotary blade is adjacent to the other rotary blades. The rotary blades are made to slide together on the outer peripheral side surfaces of the rotary blades.

Furthermore, a roller having a width comparable to the width of the rotary blade is slidable in the axial direction of the roller, and the roller is provided so as to mesh between each rotary blade of a cutter shaft equipped with a pressure means. That's true.

In addition, in a method of cutting a sheet material made by laminating two or more layers of different materials, the first step is to cut the laminated layer of relatively fragile material, and the remaining layer is cut. By cutting in the second step of cutting, the rotary blades acting on the arm can be slid in the direction of the cutter shaft, and by pressing the rotary blades at the end of one cutter shaft with the pressure means, the adjacent rotary blades are slid together. It rotates while being pressed with a moderate amount of force that makes it good. Therefore, the clearance between adjacent rotary blades can be stably maintained in an extremely small state without any difficulty, and even when cutting thin sheet materials such as magnetic tape with a thickness of about 10 μm, there are places where parts cannot be cut. It cuts without any unevenness, as if the line had been torn off.

Furthermore, if a roller with a width comparable to the width of the rotary blade is engaged between each rotary blade of a cutter shaft equipped with a pressure means, the outer peripheral side surfaces of each rotary blade will remain parallel to each other. Atsushi meshed together as if sliding together under constant pressure.
This allows for more stable cutting over a longer period of time.

Also, in a method of cutting a sheet material formed by laminating two or more layers of different materials, the cutting using the above method is performed after the first step of cutting a portion of the laminated layers of relatively fragile materials. By cutting the remaining layer using a device, the sudden shearing force generated by the rotating blades that sandwich the top and bottom surfaces of the sheet material during cutting can be prevented from being applied to the layer of material that is relatively easy to break. It is possible to cut the laminated parts at the edges of products without cracking.

Examples Examples of the present invention will be described below with reference to the drawings. Common parts in each figure are given the same number.

FIG. 1 is a schematic configuration diagram of a cutting device according to an embodiment of the present invention. In FIG. 1, a pair of cutter shafts 1.1a are rotatably supported by a pair of frame plates 5.

The rotary blade 3.3a is connected to the cutter shaft 1. The rotary blade 3.3a is slidable in the axial direction of the rotary blade 3.3a and the outer circumferential surfaces of the rotary blade 3.3a are meshed so that they slide into each other. Although it is incorporated through the coil spring 7 and spring holder 8, which are means for applying pressure in one direction of the cutter shaft, it is also possible to use, for example, a disc spring or hydraulic pressure as a means for applying pressure other than the coil spring 7.

The roller shaft 9 is rotatably supported by the frame plate 5. The roller lO has the same width as the width of the rotary blade 3.3a, is slidable in the axial direction of the roller shaft 9, and is installed so as to mesh between the rotary blade 3 and the cutter shaft 1.1a and the roller shaft. 9 is rotated by a driving means (not shown), and at the same time, the rotary blade 3.3a and the roller 10 are also rotated.

In this embodiment, the pressing force of the coil spring 7 is
By adjusting the force to an appropriate level to ensure good sliding, the clearance between adjacent rotating blades becomes extremely small and stable, and even when cutting thin sheet materials with a thickness of about 10 μm, such as magnetic tape, there will be no damage to the parts. It can be cut without any rough spots or uneven cutting lines that look like they have been torn off.

Furthermore, by providing the rollers 10 so as to mesh between the rotary blades 3, the outer peripheral side surfaces of the rotary blades 3.3a can be meshed in a good sliding state while keeping parallel to each other, resulting in more stable cutting. It is something that can be done over time.

FIG. 2 shows a method of cutting a magnetic sheet material 18 constructed by laminating two layers of different materials.

In FIG. 2, a magnetic sheet 18 obtained by sputtering a magnetic film 16 with a thickness of 1 μm on a PET base film 15 with a thickness of 100 μm is wound around a long roller 12 (as shown in FIG. 2(b)). Similarly, the core-type rotary blade 11 is provided so as to be in contact with the cutting line of the magnetic film 16 with a constant load.

In this embodiment, as a method for cutting the magnetic sheet material 18,
After the first step of cutting the layer of the magnetic film 16 with a thickness of 1 μm, which is relatively easy to break, with a core-type rotary blade, the remaining layer of the PET material base film 15 is cut with the cutting device shown in FIG. This prevents the rapid shearing force generated by the rotating blades that sandwich the upper and lower surfaces of the magnetic sheet material 18 from being applied to the layer of the magnetic film 16 that is relatively easy to break during cutting. It is possible to cut 16 parts without cracking. The cut sheet is taken up on a take-up reel 3.

7. When cutting a magnetic sheet material that has a three-layer structure in which relatively fragile magnetic films 16 are laminated on both sides of a PET base film 15, the long roller 12 in the first step is cut into a core type. Cutting can be done by replacing it with the rotary blade 11.

Furthermore, if the sheet material to be cut consists of one layer, the above first step is not necessary.

Effects of the invention As described above, go to C. Providing a pressure means for pressing the rotary blades in the direction of the cutter axis, and interlocking rollers having a width comparable to the width of the rotary blades between each rotary blade. In a method of cutting a sheet material composed of two or more layers of different materials, the first step is to cut the layer of material that is relatively easy to break, and the remaining layer is cut. By cutting in the second step, a thin sheet material such as magnetic tape, which has a thickness of about 10 μm and is composed of two or more layers of different materials, is cut into L.
Stable cutting can be performed for a long period of time without causing cracks in places where the cut cannot be made, where the cutting line is uneven as if it has been torn off, or at the edges of the cut product.

[Brief explanation of drawings]

Figure 1 zeta Figure 4 of the cutting device according to the embodiment of the present invention is a processing state diagram when a magnetic sheet is cut with a conventional cutting device. Spacer, 3
, 3a...Rotation Q 4. 4a -- Natsuto, 5
...Frame plate, 6.6a...Rotary blade holder is a thrust bearing link'', 7...Coil bar wood 8...Spring holder, 9...Roller fi 10...Roller, II...・Core type rotary blade 12...long roller,
13... Winding lino l/, 14... Magnetic tape, 15... PET material base fill 8 To 6...
Magnetism III 17...Crack 18...Magnetic sheet, 19...Cutting agent's name Patent attorney Shigetaka Awano and 1 other person 1, L 3.3 with a sharp Wζ blade (b) /, / 1-One voice Tsuta axis 2, Jiang-Syaap frame break

Claims (3)

[Claims] (1) A pair of cutter shafts each having a plurality of rotary blades spaced apart from each other, the outer peripheral side surface of each rotary blade of one cutter shaft and the outer peripheral side surface of each rotary blade of the other cutter shaft slide against each other. A cutting device in which the rotary blades are completely meshed, the rotary blades being able to slide in the direction of the cutter shaft, and the rotary blades at one end of the cutter shaft being pressed by a pressure means. (2) The cutting device according to claim (1), wherein the cutter has a roller having a width comparable to the width of the rotary blade and is slidable in the roller axial direction, and is equipped with a pressure means. A cutting device characterized in that the roller is provided so as to be engaged between the rotary blades on the opposite side of the sliding portion of the rotary blades of the shaft. (3) A method for cutting a sheet material constructed by laminating two or more layers of different materials, after the first step of cutting in advance the portion of the laminated material layers that are relatively easy to break. A cutting method comprising cutting the remaining layer using the cutting device according to claim 1.