Cutting device

Abstract

The present invention provides a cutting device that ensures a predetermined clearance between the movable blade and the fixed blade when they engage, while suppressing the generation of metal foreign matter and changes in the clearance. [Solution] The present disclosure relates to a cutting device 1 that lowers a movable blade 20 and cuts an object to be cut W by the shear force caused by the meshing of the movable blade 20 and a fixed blade 30, wherein the movable blade 20 is pivotable in a direction away from the fixed blade 30, and a first guide member 21a attached to the movable blade 20 and a second guide member 31 attached to the fixed blade 30 are positioned to overlap in a top view of the cutting device 1, the first guide member 21a is positioned to protrude below the lower surface of the movable blade 20, and the second guide member 31 is rotatable.

Description

Technical Field

[0001] The present disclosure relates to a cutting device.

Background Art

[0002] In Patent Document 1, in a cutting device that cuts an object to be cut by a shearing action based on the approaching and separating movement of an upper blade (movable blade) and a lower blade (fixed blade), a sliding portion that slides on the blade side surface on the fixed blade side is provided on the movable blade, and when the movable blade and the fixed blade mesh with each other, a predetermined clearance is secured between them to prevent chipping of the cutting edges of the movable blade and the fixed blade. A cutting device is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, since the sliding portion of the movable blade and the blade side surface on the fixed blade side are in sliding contact, there is a risk of generating metal foreign matter due to wear. In addition, there is also a risk that the sliding portion of the movable blade and the blade side surface on the fixed blade side wear, and the clearance changes. The present disclosure solves such problems, and provides a cutting device that suppresses the generation of metal foreign matter and changes in the clearance while securing a predetermined clearance between the movable blade and the fixed blade when they mesh with each other.

Means for Solving the Problems

[0005] This disclosure relates to a cutting device comprising a movable blade positioned above and movable up and down above an object to be cut, and a fixed blade positioned below the object to be cut, wherein the movable blade is lowered and the object to be cut is cut by a shear force due to the meshing of the movable blade and the fixed blade, wherein the movable blade is pivotable in a direction away from the fixed blade, a first guide member is attached to the movable blade, and a second guide member is attached to the fixed blade, the first guide member and the second guide member are positioned to overlap in a top view of the cutting device, the first guide member is positioned to protrude below the lower surface of the movable blade, or the second guide member is positioned to protrude above the upper surface of the fixed blade, and either the first guide member or the second guide member is rotatable. This configuration ensures a predetermined clearance between the movable and fixed blades when they mesh, while suppressing the generation of metallic foreign matter and changes in the clearance.

[0006] The device comprises a swing holder on which the movable blade is mounted, and a fixed holder connected to the swing holder via a hinge. The hinge has a hinge axis extending in the width direction of the object to be cut, and the movable blade swings around the hinge axis. This configuration allows the movable blade to swing away from the fixed blade.

[0007] A coil spring is provided between the fixed holder and the oscillating holder to press the movable blade against the fixed blade. This configuration makes it possible to straighten the longitudinal curvature of either the movable blade or the fixed blade.

[0008] The other of the first guide member and the second guide member is provided with an inclined surface that contacts either the first guide member or the second guide member when the movable blade is lowered, and that inclins toward the side of the movable blade or the fixed blade in the direction in which the movable blade and the fixed blade are aligned when viewed from above the cutting device, as the movable blade and the fixed blade move away from each other in the vertical direction. With this configuration, before the movable blade is lowered and the movable blade and the fixed blade engage, the inclined surface contacts the first guide member or the second guide member, causing the first guide member or the second guide member to rotate on the inclined surface and to swing the movable blade away from the fixed blade. [Effects of the Invention]

[0009] This disclosure provides a cutting device that ensures a predetermined clearance between the movable blade and the fixed blade when they mesh, while suppressing the generation of metallic foreign matter and changes in the clearance. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front view of the cutting device according to Embodiment 1. [Figure 2] This is a side view of the cutting device according to Embodiment 1. [Figure 3] This is a top view of the cutting device according to Embodiment 1. [Figure 4] This is a perspective view of the cutting device according to Embodiment 1. [Figure 5] This is a partial perspective view of the cutting device according to Embodiment 1, showing the area around the guide and cam follower. [Figure 6] This is a side view of a cutting device according to Embodiment 1, showing the state in which the cam follower is in contact with the first inclined surface of the guide. [Figure 7] This is a side view of the cutting apparatus according to Embodiment 1, showing the state in which the cam follower has reached the boundary between the first inclined surface and the second inclined surface of the guide. [Figure 8] This is a side view of the cutting apparatus according to Embodiment 1, showing the state in which the cam follower is in contact with the second inclined surface of the guide. [Figure 9] This is a side view of a cutting device according to Embodiment 1, showing the state in which the movable blade, the cutting edge, and the cutting edge of the fixed blade are engaged. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to Figures 1 to 9. Figure 1 is a front view of the cutting device of Embodiment 1. Figure 2 is a side view of the cutting device of Embodiment 1. Figure 3 is a top view of the cutting device of Embodiment 1. Figure 4 is a perspective view of the cutting device of Embodiment 1. Figure 5 is a partial perspective view of the cutting device of Embodiment 1, showing the area around the guide and cam follower. Figure 6 is a side view of the cutting device of Embodiment 1, showing the state in which the cam follower is in contact with the first inclined surface of the guide. Figure 7 is a side view of the cutting device of Embodiment 1, showing the state in which the cam follower has reached the boundary between the first inclined surface and the second inclined surface of the guide. Figure 8 is a side view of the cutting device of Embodiment 1, showing the state in which the cam follower is in contact with the second inclined surface of the guide. Figure 9 is a side view of the cutting device of Embodiment 1, showing the state in which the movable blade, the cutting edge, and the cutting edge of the fixed blade are meshed together.

[0012] It should be noted that the right-handed XYZ Cartesian coordinate system shown in Figures 1 to 9 is merely a convenient representation for explaining the positional relationships of the constituent elements. In Figures 1 to 9, the positive Z-axis direction is the upward direction, and the XY plane is the horizontal plane.

[0013] Embodiment 1 The cutting device 1 shown in Figures 1 to 4 is a device that cuts a sheet-like metal foil (hereinafter abbreviated as "workpiece W") which will be used as a base material for lithium-ion batteries, by shearing through the interlocking of a movable blade 20 and a fixed blade 30. The workpiece W, which is the object to be cut, is made of aluminum, copper, etc., and has a width of 1200 to 1500 mm and a thickness of 60 to 110 μm. As shown in Figure 2, the workpiece W is supported by a clamp C and transported from the back side to the front side (positive X-axis direction in Figure 2) of the cutting device 1.

[0014] As shown in FIGS. 1 to 4, the cutting device 1 includes a holder plate 10, a fixed holder 12, a swing holder 14, a movable blade 20, and a fixed blade 30.

[0015] The holder plate 10 is formed in a flat plate shape that is rectangular in plan view, and is arranged such that the flat surface portion faces the conveyance direction of the workpiece W (the positive X-axis direction in FIG. 2). As shown in FIG. 3, on the flat surface portion of the holder plate 10, inner rails 11 that are substantially rectangular parallelepiped-shaped and extend in the vertical direction (the Z-axis direction in FIG. 3) are provided. The inner rails 11 are provided in a pair at both ends in the longitudinal direction of the holder plate 10 (the Y-axis direction in FIG. 3).

[0016] The fixed holder 12 is formed in an elongated substantially flat plate shape, and is arranged such that the flat surface portion faces the conveyance direction of the workpiece W (the positive X-axis direction in FIG. 2). As shown in FIG. 3, on the flat surface portion of the fixed holder 12, outer rails 13 that have a concave cross-section and extend in the vertical direction (the Z-axis direction in FIG. 3) are provided. The outer rails 13 are provided in a pair at both ends in the longitudinal direction of the fixed holder 12 (the Y-axis direction in FIG. 3).

[0017] As shown in FIG. 2, the fixed holder 12 is arranged on the downstream side in the conveyance direction of the workpiece W with respect to the holder plate 10. The holder plate 10 and the fixed holder 12 are arranged such that their respective flat surface portions face each other. As shown in FIG. 3, by fitting the inner rails 11 into the recesses of the outer rails 13, the holder plate 10 and the fixed holder 12 are connected and can move relative to each other in the vertical direction (the Z-axis direction in FIG. 3). A cylinder 10a for raising and lowering the fixed holder 12 in the vertical direction (the Z-axis direction in FIG. 3) is attached to the holder plate 10.

[0018] The swing holder 14 is formed in an elongated substantially rectangular parallelepiped shape and is arranged such that its longitudinal direction faces the width direction of the workpiece W (the Y-axis direction in FIG. 1). As shown in FIG. 2, the swing holder 14 is arranged on the downstream side in the conveyance direction of the workpiece W with respect to the fixed holder 12. The swing holder 14 is connected to the fixed holder 12 via a hinge 15. As shown in FIG. 1, a pair of hinges 15 are provided at both ends in the longitudinal direction of the swing holder 14 (the Y-axis direction in FIG. 1).

[0019] As shown in FIG. 4, the hinge 15 has an upper hinge 15a, a lower hinge 15b, and a hinge shaft 15c. The upper hinge 15a is attached to the planar portion on the workpiece W conveyance direction side (the positive X-axis direction side in FIG. 4) of the fixed holder 12. The lower hinge 15b is attached to the upper surface of the swing holder 14. The hinge shaft 15c extends in the longitudinal direction of the swing holder 14, that is, in the width direction of the workpiece W (the Y-axis direction in FIG. 4). The hinge shaft 15c is pivotally supported by the sliding bearings formed in the upper hinge 15a and the lower hinge 15b, respectively. Considering the generation of metallic foreign substances, it is desirable that the hinge shaft 15c be pivotally supported by a rolling bearing.

[0020] As shown in FIG. 2, the lower hinge 15b is connected to the upper hinge 15a via the hinge shaft 15c in a state swingable in the conveyance direction and the vertical direction of the workpiece W (the direction of the solid line arrow in FIG. 2). That is, the swing holder 14 is connected to the fixed holder 12 via the hinge 15 in a state swingable in the conveyance direction and the vertical direction of the workpiece W (the direction of the solid line arrow in FIG. 2).

[0021] As shown in Figures 1 to 4, a coil spring 16 is provided between the fixed holder 12 and the oscillating holder 14. As shown in Figure 4, a total of four coil springs 16 are arranged in a row along the longitudinal direction of the fixed holder 12. One end of each coil spring 16 is supported by a coil spring support 16a attached to the flat portion of the fixed holder 12 on the workpiece W transport direction side (positive X-axis direction in Figure 4). The other end of each coil spring 16 is supported by the upper surface of the oscillating holder 14. The coil springs 16 are arranged to be expandable and contractible in the vertical direction (Z-axis direction in Figure 4). The coil springs 16 bias the oscillating holder 14 downwards.

[0022] The movable blade 20 is mounted on the oscillating holder 14. The movable blade 20 is formed in an elongated, flat shape, and its flat portion is positioned so as to face the direction of workpiece W transport (positive X-axis direction in Figure 4). The upper part of the movable blade 20 is fixed to the oscillating holder 14 by fixing means not shown. As shown in Figures 1 and 2, a cutting edge 20a is provided at the lower end of the movable blade 20 on the side opposite to the workpiece W transport direction (negative X-axis direction in Figure 2) (in Figure 2, the lower surface 20c of the movable blade 20 on which the lowest cutting edge 20a is provided is shown by a dashed line). As shown in Figure 1, the cutting edge 20a is provided along the longitudinal direction of the movable blade 20 (Y-axis direction in Figure 1). The cutting edge 20a has a shear angle α that is inclined in the vertical direction (Z-axis direction in Figure 1). The shear angle α of the cutting edge 20a is set to be greater than 0° and not exceeding 3°. Furthermore, the cutting blade 20a is angled to a predetermined degree so that the cross-section of the cutting device 1, when viewed from the side, is acute.

[0023] As shown in Figure 3, a pin 14a is attached to the oscillating holder 14. The movable blade 20 can rotate around the pin 14a as its axis in the direction of transporting the workpiece W (in the direction of the solid arrow in Figure 3). That is, the movable blade 20 can be positioned at a predetermined angle relative to the fixed blade 30, which will be described later, when viewed from above by the cutting device 1.

[0024] As shown in Figures 1 and 4, the movable blade 20 is provided with a projection 20b. The projection 20b is located on one end of the movable blade 20 in the longitudinal direction, and is positioned lower than the cutting edge 20a which is inclined at a shear angle α. The projection 20b is located on the outside in the width direction of the workpiece W. The projection 20b is formed to protrude below the cutting edge 20a (towards the negative Z-axis direction in Figure 1).

[0025] As shown in Figures 1, 2, 4, and 5, a guide 21 is attached to the protruding portion 20b. The guide 21 has a guide body portion 21a and a guide mounting portion 21b. As shown in Figure 2, the guide body portion 21a has a pentagonal shape in a side view of the cutting device 1 and is formed in a plate shape. As shown in Figure 1, the guide body portion 21a is positioned on the outside in the longitudinal direction (Y-axis direction in Figure 1) of the movable blade 20. Furthermore, the lower part of the guide body portion 21a is positioned to protrude below the lower surface of the protruding portion 20b (negative Z-axis direction in Figure 1). The guide body portion 21a constitutes a first guide member attached to the movable blade 20.

[0026] As shown in Figure 1, the guide mounting portion 21b extends inward from the upper part of the guide body portion 21a in the longitudinal direction (Y-axis direction in Figure 1) of the movable blade 20. The guide mounting portion 21b is attached to the surface of the protruding portion 20b facing the workpiece W transport direction (positive X-axis direction in Figure 1).

[0027] As shown in Figure 2, the guide body 21a is provided with a first inclined surface 21c and a second inclined surface 21d. The first inclined surface 21c and the second inclined surface 21d are provided on the surface of the guide body 21a facing the opposite direction from the workpiece W transport direction (the negative X-axis direction in Figure 2). The first inclined surface 21c is located below the second inclined surface 21d (the negative Z-axis direction in Figure 2). In a side view of the cutting device 1, the first inclined surface 21c is located below the lower surface of the protruding portion 20b.

[0028] The first inclined surface 21c is inclined so as it moves from the bottom to the top of the guide body 21a, it moves toward the opposite direction from the workpiece W transport direction (negative X-axis direction in Figure 2). The second inclined surface 21d is inclined so as it moves from the bottom to the top of the guide body 21a, it moves toward the transport direction of the workpiece W (positive X-axis direction in Figure 2). The first inclined surface 21c is inclined toward the installation side of the fixed blade 30 (negative X-axis direction in Figure 2) in the direction in which the movable blade 20 and the fixed blade 30 are aligned when viewed from above the cutting device 1 (X-axis direction in Figure 2) as the movable blade 20 and the fixed blade 30, which will be described later, move toward the opposite direction from each other in the vertical direction (Z-axis direction in Figure 2).

[0029] As shown in Figures 1, 2, 4, and 5, the fixed blade 30 is located below the movable blade 20. The fixed blade 30 is formed in an elongated, roughly rectangular parallelepiped shape, and is positioned so that its longitudinal direction is in the width direction of the workpiece W (Y-axis direction in Figure 1). As shown in Figure 1, the length of the fixed blade 30 in the longitudinal direction (Y-axis direction in Figure 1) is approximately the same as the length of the movable blade 20 in the longitudinal direction. As shown in Figure 2, the fixed blade 30 is positioned upstream of the movable blade 20 in the conveying direction of the workpiece W (positive X-axis direction in Figure 2). The fixed blade 30 can be moved downward to allow the clamper C to pass when the workpiece W is being conveyed.

[0030] As shown in Figure 2, a cutting edge 30a is provided at the upper end of the fixed blade 30 on the side that conveys the workpiece W (the positive X-axis direction in Figure 2) (in Figure 2, the fixed blade 30 hidden by the cam follower 31, which will be described later, is shown by a dashed line). As shown in Figures 1 and 4, the cutting edge 30a is provided along the longitudinal direction of the fixed blade 30 (the Y-axis direction in Figure 1). The cutting edge 30a is set at a predetermined angle so that the cross-section in a side view of the cutting device 1 is acute. As shown in Figure 1, the cutting edge 30a is provided so as to be parallel to the horizontal plane.

[0031] As shown in Figures 1, 2, 4, and 5, a cam follower 31 is attached to the fixed blade 30. As shown in Figure 1, the cam follower 31 is located on one end of the fixed blade 30 in the longitudinal direction (Y-axis direction in Figure 1), on the side where the guide 21 is installed. The cam follower 31 is positioned on the outside of the fixed blade 30 in the longitudinal direction (Y-axis direction in Figure 1). The cam follower 31 constitutes a second guide member attached to the fixed blade 30.

[0032] As shown in Figure 5, the cam follower 31 has a stud 31a and an outer ring 31b. The stud 31a is cylindrical and is positioned so that its central axis faces the longitudinal direction of the fixed blade 30 (the Y-axis direction in Figure 5). One end of the stud 31a on the fixed blade 30 side is fixed to the fixed blade 30. An outer ring 31b is provided on the outer circumference of the stud 31a via rolling elements (not shown). The outer ring 31b rotates around the central axis of the stud 31a.

[0033] As shown in Figures 1 and 2, the guide body 21a and the cam follower 31 are positioned to overlap in a top view of the cutting device 1. Specifically, as shown in Figure 2, the first inclined surface 21c of the guide body 21a and the end 31c of the cam follower 31 on the workpiece W transport direction side (positive X-axis direction in Figure 2) overlap in a top view of the cutting device 1.

[0034] Next, the method for cutting the workpiece W using the cutting device 1 will be explained using Figures 2 and 6 to 9.

[0035] First, as shown in Figure 2, the workpiece W to be cut is transported between the movable blade 20 and the fixed blade 30. Next, the cylinder 10a of the holder plate 10 is activated to lower the fixed holder 12, the swinging holder 14, and the movable blade 20.

[0036] As the movable blade 20 is lowered, the outer ring 31b of the cam follower 31 comes into contact with the first inclined surface 21c of the guide body 21a. Furthermore, as the movable blade 20 is lowered, as shown in Figure 6, the outer ring 31b of the cam follower 31 rotates on the first inclined surface 21c, and the oscillating holder 14 and the movable blade 20 oscillate around the hinge axis 15c in the direction of workpiece W transport and upward (in the direction of the solid arrow in Figure 6). That is, the movable blade 20 oscillates away from the fixed blade 30. In addition, the oscillating of the oscillating holder 14 compresses the coil spring 16.

[0037] Furthermore, as the movable blade 20 is lowered, the outer ring 31b of the cam follower 31 comes into contact with the boundary between the first inclined surface 21c and the second inclined surface 21d, as shown in Figure 7. At this time, the amount of oscillation of the oscillating holder 14 and the movable blade 20 in the workpiece W transport direction and upward is maximized. A predetermined clearance is then secured between the protruding portion 20b and the fixed blade 30 in the workpiece W transport direction (positive X-axis direction in Figure 7). The clearance is set to a few micrometers. The protruding portion 20b is close to the fixed blade 30 until just before it engages with it (overlap occurs between the two when viewed in the workpiece W transport direction).

[0038] Furthermore, as the movable blade 20 is lowered, as shown in Figure 8, the outer ring 31b of the cam follower 31 rotates on the second inclined surface 21d, crossing the boundary between the first inclined surface 21c and the second inclined surface 21d. When the outer ring 31b of the cam follower 31 crosses the boundary between the first inclined surface 21c and the second inclined surface 21d and contacts the second inclined surface 21d, the protrusion 20b and the fixed blade 30 begin to engage. Immediately before the engagement between the protrusion 20b and the fixed blade 30 begins, a predetermined clearance is secured between the protrusion 20b and the fixed blade 30 in the direction of workpiece W transport. Therefore, at the timing when the engagement between the protrusion 20b and the fixed blade 30 begins, the lower surface of the protrusion 20b and the cutting edge 30a of the fixed blade 30 do not come into contact. Consequently, the occurrence of damage to the cutting edge 30a of the fixed blade 30 can be suppressed.

[0039] Furthermore, when the outer ring 31b of the cam follower 31 begins to rotate on the second inclined surface 21d, the oscillating holder 14 and the movable blade 20 oscillate around the hinge axis 15c in the opposite direction to the workpiece W transport direction and downward (in the direction of the solid arrow in Figure 8). This oscillating of the oscillating holder 14 causes the compressed coil spring 16 to expand due to its restoring force. The expansion of the coil spring 16 pushes the oscillating holder 14 and the movable blade 20 in the opposite direction to the workpiece W transport direction (negative X-axis direction in Figure 8). As the movable blade 20 is pushed in the opposite direction to the workpiece W transport direction, the protruding portion 20b presses against the fixed blade 30. Specifically, the side of the protruding portion 20b facing the opposite direction to the workpiece W transport direction (negative X-axis direction in Figure 8) presses against the side of the fixed blade 30 facing the workpiece W transport direction (positive X-axis direction in Figure 8).

[0040] Furthermore, as the movable blade 20 is lowered, as shown in Figure 9, the cutting edge 20a of the movable blade 20 and the cutting edge 30a of the fixed blade 30 engage, and the workpiece W is cut by shear force. While the cutting edge 20a of the movable blade 20 and the cutting edge 30a of the fixed blade 30 are engaged, the extension of the coil spring 16 pushes the oscillating holder 14 and the movable blade 20 in the opposite direction to the conveying direction of the workpiece W (negative X-axis direction in Figure 9). As the movable blade 20 is pushed in the opposite direction to the conveying direction of the workpiece W, the movable blade 20 presses against the fixed blade 30. Specifically, the side of the movable blade 20 facing the opposite direction to the conveying direction of the workpiece W (negative X-axis direction in Figure 9) presses against the side of the fixed blade 30 facing the conveying direction of the workpiece W (positive X-axis direction in Figure 9). The movable blade 20 presses against the fixed blade 30, which can make the longitudinal curvature of either the movable blade 20 or the fixed blade 30 closer to being straight.

[0041] The cutting device 1 has a movable blade 20 that can swing away from the fixed blade 30. The movable blade 20 has a guide body 21a attached to it that protrudes below its lower surface, and the fixed blade 30 has a rotatable cam follower 31 attached to it that is positioned to overlap with the guide body 21a when viewed from above the cutting device 1. With this configuration, before the movable blade 20 descends and engages with the fixed blade 30, the guide body 21a and the cam follower 31 come into contact, causing the movable blade 20 to swing away from the fixed blade 30. Therefore, when the movable blade 20 and the fixed blade 30 engage, a predetermined clearance is ensured between them, preventing damage to the cutting edge. In addition, because the cam follower 31 is rotatable, even if the cam follower 31 and the guide body 21a come into contact, wear does not occur, and the generation of metallic foreign matter and changes in clearance can be suppressed.

[0042] In this embodiment, a guide body is attached to the movable blade, protruding below its lower surface, and a rotatable cam follower is attached to the fixed blade. However, the guide body may not protrude below the lower surface of the movable blade, and the cam follower may be attached in a position that protrudes above the upper surface of the fixed blade. Alternatively, the guide body may be attached to the fixed blade, and a rotatable cam follower may be attached to the movable blade, with the guide body protruding above the upper surface of the fixed blade. Alternatively, the guide body may be attached to the fixed blade, and a rotatable cam follower may be attached to the movable blade, with the cam follower protruding below the lower surface of the movable blade.

[0043] Furthermore, the swing holder 14 on which the movable blade 20 is mounted and the fixed holder 12 are connected via a hinge 15. The hinge 15 has a hinge axis 15c that extends in the width direction of the workpiece W, and the movable blade 20 swings around the hinge axis 15c. With this configuration, the movable blade 20 can swing away from the fixed blade 30.

[0044] Furthermore, a coil spring 16 is provided between the fixed holder 12 and the oscillating holder 14 to press the movable blade 20 against the fixed blade 30. This configuration makes it possible to straighten the longitudinal curvature of either the movable blade 20 or the fixed blade 30.

[0045] Furthermore, the guide body 21a is provided with a first inclined surface 21c that contacts the cam follower 31 when the movable blade 20 is lowered, and as the movable blade 20 and the fixed blade 30 move away from each other in the vertical direction, the inclined surface 21c tilts toward the fixed blade 30 in the direction in which the movable blade 20 and the fixed blade 30 are aligned when viewed from above the cutting device 1. With this configuration, before the movable blade 20 is lowered and the movable blade 20 and the fixed blade 30 engage, the first inclined surface 21c and the cam follower 31 come into contact, causing the cam follower 31 to rotate on the first inclined surface 21c and the movable blade 20 to swing away from the fixed blade 30. As a result, when the movable blade 20 and the fixed blade 30 engage, a predetermined clearance is secured between them, preventing damage to the cutting edge.

[0046] In this embodiment, a guide body with an inclined surface is attached to the movable blade, and a cam follower is attached to the fixed blade. However, it is also acceptable to attach the guide body with an inclined surface to the fixed blade and the cam follower to the movable blade. In that case, the inclined surface will contact the cam follower when the movable blade is lowered, and as the movable blade and fixed blade move away from each other in the vertical direction, it will incline towards the movable blade's mounting side in the direction in which the movable blade and fixed blade are aligned when viewed from above the cutting device.

[0047] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its spirit. [Explanation of Symbols]

[0048] 1...cutting device 12...Fixed holder 14. Swivel holder 15. Hinge 15c...Hinge shaft 16. Coil springs 20...Movable blade 21... Guide 21a. Guide body 21c...1st slope 21d...Second slope 30...Fixed blade 31.. Come follower 31b ··Outer ring W...work

Claims

1. A movable blade positioned above the object to be cut and capable of moving up and down, It comprises a fixed blade positioned below the object to be cut, A cutting device that lowers the movable blade and cuts the object to be cut by the shear force produced by the meshing of the movable blade and the fixed blade, The movable blade is capable of swinging away from the fixed blade. A first guide member is attached to the aforementioned movable blade. A second guide member is attached to the aforementioned fixed blade. The first guide member and the second guide member are positioned so that they overlap when viewed from above the cutting device. The first guide member is positioned so as to protrude below the lower surface of the movable blade, or the second guide member is positioned so as to protrude above the upper surface of the fixed blade. Either the first guide member or the second guide member is rotatable. Cutting device.

2. A swing holder on which the aforementioned movable blade is mounted, The swing holder is connected to the fixed holder via a hinge, The hinge has a hinge axis that extends in the width direction of the object to be cut. The movable blade swings around the hinge axis. The cutting device according to claim 1.

3. A coil spring is provided between the fixed holder and the swinging holder to press the movable blade against the fixed blade. The cutting apparatus according to claim 2.

4. The other of the first guide member and the second guide member is provided with an inclined surface that contacts either the first guide member or the second guide member when the movable blade is lowered, and that, as the movable blade and the fixed blade move away from each other in the vertical direction, inclined toward the side where the movable blade or the fixed blade is installed in the direction in which the movable blade and the fixed blade are aligned when viewed from above the cutting device. The cutting device according to claim 1.

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