Cutting device and cutting method

Abstract

To prevent materials from different layers from coming into contact with each other when cutting a sheet-like workpiece made up of multiple layers. [Solution] The cutting device cuts the side edges of a sheet-like workpiece, which is made up of multiple layers, along the feeding direction. The cutting device has a pair of cutting blades that feed the workpiece in the feeding direction and, while gripping the side edges of the upper and lower surfaces of the workpiece, make cuts of a predetermined depth in each of the side edges of the upper and lower surfaces.

Description

Technical Field

[0001] The present disclosure relates to a cutting device and a cutting method for cutting a workpiece.

Background Art

[0002] A cutting method for cutting a sheet-shaped workpiece by a gang slit method is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above cutting method, when cutting a sheet-shaped workpiece in which a plurality of layers are laminated, such as an electrode of a battery, there is a risk that materials of different layers come into contact with each other and cause a short circuit.

[0005] The present disclosure has been made in view of such problems, and a main object thereof is to provide a cutting device and a cutting method capable of preventing materials of different layers from coming into contact with each other when cutting a sheet-shaped workpiece in which a plurality of layers are laminated.

Means for Solving the Problems

[0006] One aspect of the present invention for achieving the above object is a cutting device for cutting a side end portion along the feeding direction of a sheet-shaped workpiece in which a plurality of layers are laminated, and having a pair of cutting blade portions that make cuts with a predetermined depth in the side end portions of the upper and lower surfaces of the workpiece while feeding the workpiece in the feeding direction and sandwiching the side end portions of the upper and lower surfaces of the workpiece. Cutting device is. On this flight, Each of the cutting blades may make a cut that is shallower than the depth of the outermost layer at the side edge of the upper and lower surfaces of the workpiece. On this flight, The device may further have a bending portion that presses the side edge of the workpiece into which the aforementioned cut has been made, and bends the workpiece starting from the cut, thereby cutting off the side edge. On this flight, The workpiece may be a sheet-shaped electrode. One aspect of the present invention for achieving the above objective is: A cutting method for cutting the side edge of a sheet-like workpiece, which is made up of multiple layers stacked together, along the feeding direction, While feeding the workpiece in the feed direction, the pair of cutting blades grip the side edges of the upper and lower surfaces of the workpiece and make cuts to a predetermined depth in each of the side edges. Cutting method That is the case. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a cutting apparatus and cutting method that can prevent materials from different layers from coming into contact with each other when cutting a sheet-like workpiece made up of multiple layers. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows a schematic configuration of the cutting device according to this embodiment. [Figure 2] This diagram shows the state in which the notched section makes cuts on the upper and lower surfaces of a sheet-like workpiece. [Figure 3] This figure shows the schematic configuration of a pair of cutting blades. [Figure 4] This is a diagram showing the general structure of the folded section. [Figure 5] This diagram shows the state in which a sheet-like workpiece is folded starting from a cut and the side edge is cut. [Modes for carrying out the invention]

[0009] Hereinafter, this embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a cutting device according to this embodiment.

[0010] The cutting device 1 according to this embodiment adjusts the width of the sheet-like workpiece W by cutting the side end portion along the conveyance direction (feeding direction) of the sheet-like workpiece formed by laminating a plurality of layers.

[0011] The cutting device 1 performs slitting by performing the above-described cutting on the sheet-like workpiece W. The sheet-like workpiece W is a thin plate-like material. The sheet-like workpiece includes a belt-like material.

[0012] For example, a roll-shaped material around which a belt-like material is wound may be used as the sheet-like workpiece W. Preferred examples of the sheet-like workpiece W include a sheet-like electrode (positive electrode or negative electrode) in which an electrode (positive electrode or negative electrode) composite layer having a predetermined composition containing an electrode active material or the like is laminated on the surface of a sheet-like metal foil (current collector). For example, it may be an electrode material for an all-solid-state lithium-ion secondary battery or other secondary batteries.

[0013] By the way, as described above, when cutting a sheet-like workpiece W in which a plurality of layers such as electrodes of a battery are laminated, there is a risk that materials of different layers come into contact with each other and cause a short circuit.

[0014] On the other hand, the cutting device 1 according to this embodiment sandwiches the side end portions of the upper and lower surfaces of the sheet-like workpiece W with a pair of slit blades, and makes cuts with a predetermined depth at the side end portions of the upper and lower surfaces respectively. By limiting the cut to a predetermined depth in this way, it is possible to prevent materials of different layers from touching each other.

[0015] The cutting device 1 according to this embodiment includes an unwinding portion 2, a foil splicing portion 3, a cutting portion 4, and a winding portion 5.

[0016] The unwinding unit 2 unwinds the sheet-like workpiece W wound in a roll shape. The sheet-like workpiece W wound around the unwinding roller 21 of the unwinding unit 2 is unwound via a plurality of rollers 22. The sheet-like workpiece W unwound from the unwinding unit 2 passes through the foil splicing unit 3 and enters the cutting unit 4.

[0017] The cutting unit 4 cuts the side end portion of the sheet-like workpiece W sent from the foil splicing unit 3. The cutting unit 4 has a cutting portion 41 and a bending portion 42 disposed downstream of the cutting portion 41.

[0018] FIG. 2 is a diagram showing a state in which the cutting portion makes cuts on the upper and lower surfaces of the sheet-like workpiece. As shown in FIG. 2, the cutting portion 41 is provided on the upper surface side of the sheet-like workpiece W and has an upper cutting blade portion 411 that rotates in the conveying direction, and a lower cutting blade portion 412 that is provided on the lower surface side of the sheet-like workpiece W and rotates in the conveying direction.

[0019] The pair of upper and lower cutting blade portions 411 and 412 make cuts of a predetermined depth on the side end portions of the upper and lower surfaces of the sheet-like workpiece W while sandwiching the side end portions of the upper and lower surfaces of the sheet-like workpiece W in a state of feeding the sheet-like workpiece W in the conveying direction.

[0020] Each cutting blade portion makes a cut shallower than the depth of the outermost layer W1 of the side end portions of the upper and lower surfaces of the sheet-like workpiece W, for example. Thereby, it is possible to prevent the material of the outermost layer W1 from coming into contact with the material of the layer W5 adjacent to the outermost layer W1.

[0021] FIG. 3 is a diagram showing a schematic configuration of the pair of cutting blade portions. As shown in FIG. 3, each of the cutting blade portions 411 and 412 is constituted by a disk-shaped member rotatable about a rotation axis. On the outer periphery of the disk-shaped member, slit blades 4111 and 4121 that contact and cut the upper and lower surfaces of the sheet-like workpiece W are provided.

[0022] The pair of disc-shaped slitting blades 4111 and 4121 rotate in the direction of transport of the sheet-like workpiece W, and while gripping the upper and lower surfaces of the sheet-like workpiece W, they make cuts to a predetermined depth on the upper and lower surfaces, respectively. The seed-like workpiece W, which has been cut in the cut section 41, enters the bending section 42 downstream, as shown in Figure 1.

[0023] Furthermore, if the sheet-like workpiece W is made of a material whose side edges can be separated only by the aforementioned cuts, the cutting portion 4 may have only the cut portion 41, that is, a configuration without the following bent portion 42.

[0024] Figure 4 shows a schematic configuration of the folding section. As shown in Figure 4, the folding section 42 presses the side edge of the sheet-like workpiece W into which the cuts have been made, and folds the sheet-like workpiece W starting from the cuts, thereby cutting off the side edge W3 from the sheet-like workpiece body W2.

[0025] The bending section 42 has a pair of upper and lower nip rolls 421 and 422 that sandwich the sheet-like workpiece W, and a bending roll 423 that bends the sheet-like workpiece W.

[0026] The upper and lower pair of nip rolls 421 and 422 are composed of substantially disc-shaped members that can rotate around a rotation axis. The upper and lower pair of nip rolls 421 and 422 grip the sheet-like workpiece body W2 and rotate in the conveying direction, thereby feeding the sheet-like workpiece body W2 in the conveying direction.

[0027] The bending roll 423 is located on the underside of the side edge W3 of the sheet-like workpiece W. The outer surface of the bending roll 423 contacts only the side edge W3 of the sheet-like workpiece W. The bending roll 423 and the lower nip roll 422 are arranged coaxially and rotate simultaneously in the conveying direction.

[0028] Since the radius of the bending roll 423 is larger than the radius of the lower nip roll 422, the bending roll 423 protrudes outward relative to the lower nip roll 422.

[0029] Therefore, as shown in Figure 5, the upper and lower nip rolls 421 and 422 clamp the sheet-like workpiece body W2, while the bending roll 423 presses upward against the side edge W3 of the sheet-like workpiece W, bending the sheet-like workpiece W starting from the cut W4, thereby cutting off the side edge W3 from the sheet-like workpiece body W2.

[0030] As described above, the sheet-like workpiece body W2, which has been cut, is sent to the winding section 5 as shown in Figure 1. The winding rollers 51 of the winding section 5 wind up the sheet-like workpiece body W2 sent from the cutting section 4 via a plurality of rollers 52.

[0031] As described above, according to the cutting method of this embodiment, while feeding the sheet-like workpiece W in the feeding direction, the side edges of the upper and lower surfaces of the sheet-like workpiece W are sandwiched between a pair of cutting blades 411 and 412, and cuts W4 are made to a predetermined depth in each of the side edges of the upper and lower surfaces. By limiting the depth of the cuts W4 to partway through the layers in this way, it is possible to prevent materials from different layers from coming into contact with each other.

[0032] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of Symbols]

[0033] 1 cutting device 2. Dispensing section 3. Foil joint 4 Cut section 5. Winding section 21 unwinding roller 22 Laura 41 Cut section 42 Folded section 51 Winding roller 52 Laura 411 Cutting blade part 412 Cutting blade part 421 Nip Roll 422 Nip Roll 423 Folding Roll 4111 Slit blade 4112 Slit blade

Claims

1. A cutting device for cutting the side edge of a sheet-like workpiece, which is made up of multiple layers stacked together, along the feeding direction, The device has a pair of cutting blades that, while feeding the workpiece in the feeding direction, clamp the side edges of the upper and lower surfaces of the workpiece and make cuts of a predetermined depth in each of the side edges of the upper and lower surfaces. Cutting device.

2. A cutting device according to claim 1, Each of the cutting blades makes a cut that is shallower than the depth of the outermost layer at the side edge of the upper and lower surfaces of the workpiece. Cutting device.

3. A cutting device according to claim 1, The device further has a bending portion which presses the side edge of the workpiece into which the aforementioned cut has been made and bends the workpiece starting from the cut, thereby splitting the side edge. Cutting device.

4. A cutting device according to claim 1, The workpiece is a sheet-shaped electrode. Cutting device.

5. A cutting method for cutting the side edge of a sheet-like workpiece, which is made up of multiple layers stacked together, along the feeding direction, While feeding the workpiece in the feed direction, the pair of cutting blades grip the side edges of the upper and lower surfaces of the workpiece and make cuts to a predetermined depth in each of the side edges. Cutting method.

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