Harvesting cutting blade and harvesting device equipped with the same

Abstract

To effectively cut an object to be cut by guiding the object to be cut toward a blade bottom direction while preventing it from escaping toward a blade edge direction.SOLUTION: In a harvesting cutting blade 1 that cuts an object to be cut by overlapping a first blade 2 having a plurality of first blade portions 2a arranged in a straight line at a predetermined interval with a second blade 3 having a plurality of second blade portions 3a arranged in a straight line at a predetermined interval, and sliding and moving the first blade 2 and the second blade 3 relative to each other, the first blade portion 2a has a sharp arc-shaped first blade surface 2b formed on at least one side in a sliding direction, and the second blade portion 3a has a sharp arc-shaped first blade surface 3b formed on at least one side in the sliding direction, and the first blade surface 2b and the second blade surface 3c are formed in an arc shape so that an angle formed between the first blade surface 2b and the second blade surface 3c gradually narrows in a plan view of the first blade 2 and the second blade 3 by sliding and moving the first blade 2 and the second blade 3 relative to each other.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cutting blade for use with a cutting device such as a hedge trimmer. [Background technology]

[0002] Conventionally, harvesting devices such as hedge trimmers and oscillating clippers are known to cut grass and branches by reciprocating first and second blades that extend in a straight line and have cutting edges on both sides in the width direction.

[0003] 11, for example, the cutting blade 101 of this harvesting device is configured to cut grass, branches, and other objects to be cut (not shown) by overlapping a first blade 102 having a plurality of first blade portions 102a arranged in a straight line at a predetermined interval A and a second blade 103 having a plurality of second blade portions 103a arranged in a straight line at a predetermined interval B, and sliding the first blade 102 and the second blade 103 relative to one another. Normally, the interval A and the interval B are the same length. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-327669 Summary of the Invention [Problem to be solved by the invention]

[0005] As shown in enlarged views in Figures 12(a) to (d), in conventional cutting blades for cutting, as the distance between the first blade portion 102a of the first blade 102 and the second blade portion 103a of the first blade 102 relatively approaches each other from, for example, 14 mm to 6 mm, the angle between the second blade surface 102c and the first blade surface 103b remains constant at 20°, resulting in a problem that the material to be cut easily slips away toward the blade tip.

[0006] The present invention has been made in consideration of these points, and its purpose is to guide the workpiece toward the bottom of the blade while making it difficult for it to escape toward the tip of the blade, thereby effectively cutting the workpiece. [Means for solving the problem]

[0007] In order to achieve the above object, in the present invention, the cutting edge shapes of the first blade and the second blade are devised.

[0008] Specifically, in the first invention, A first blade having a plurality of first blade portions arranged in a straight line at predetermined intervals; A second blade having a plurality of second blade portions arranged in a straight line at predetermined intervals is overlapped with the second blade. A cutting blade for reaping that cuts an object to be cut by sliding the first blade and the second blade relative to each other, The first blade portion has a first blade surface and a second blade surface each having an arc shape recessed on both sides in the sliding direction, The second blade portion has a first blade surface and a second blade surface each having a concave arc shape on both sides in the sliding direction, By sliding the first blade and the second blade relative to one another, the first blade surface and the second blade surface are shaped into an arc so that, in a plan view of the first blade and the second blade, the angle formed between the first blade surface on one side in the sliding direction of the first blade portion and the second blade surface on the other side in the sliding direction of the second blade portion and the angle formed between the second blade surface on the other side in the sliding direction of the first blade portion and the first blade surface on one side in the sliding direction of the second blade portion gradually narrows.

[0009] According to the above configuration, when the first blade and the second blade slide relative to each other, the workpiece sandwiched between the first blade surface and the second blade surface is guided toward the bottom of the blade, and as the distance between the first blade surface and the second blade surface narrows, the angle between the blade surfaces becomes smaller, so that the workpiece is less likely to escape outside the cutting edge.

[0010] In the second invention, in the first invention, The first blade surface and the second blade surface of the first blade and the second blade have arc centers located closer to the blade bottom than the blade tip in a plan view.

[0011] With the above configuration, when the first blade and the second blade slide relative to each other, the workpiece sandwiched between the first blade surface and the second blade surface is less likely to escape outside the blade edges, compared to a configuration in which the centers of the arcs are located outside the respective blade edges.

[0012] In a third aspect of the present invention, in the first or second aspect of the present invention, At least one of the first blade portion and the second blade portion has a sharp third blade surface formed on its cutting edge, the third blade surface being inclined at an angle of 10° to 40° with respect to the sliding direction.

[0013] According to the above configuration, even if the object to be cut that is sandwiched between the first blade surface and the second blade surface escapes to the outside of the blade tip, the object to be cut is scratched by the sharp third blade surface that is inclined at the tip, so that the object to be cut that is sandwiched between the first blade surface and the second blade surface is easily cut again. The inclination direction may be an upward gradient or a downward gradient toward the base side of the reaping cutting blade.

[0014] In a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, A saw-like blade surface is formed on a tip side of at least one of the first blade surface and the second blade surface.

[0015] According to the above configuration, the saw blade catches an object to be cut that is sandwiched between the first blade surface and the second blade surface, making it difficult for the object to escape outward beyond the cutting edge, and the saw blade improves cutting efficiency.

[0016] In a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, The first blade portion and the second blade portion have saw-shaped blade surfaces formed on their cutting edge sides.

[0017] According to the above configuration, the sawtooth blade surfaces on both sides in the sliding direction catch on the workpiece sandwiched between the first blade surface and the second blade surface of the first blade and the second blade, making it even more difficult for the workpiece to escape outward beyond the cutting edge, and the sawtooth blade surfaces improve cutting efficiency.

[0018] In a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, A saw-shaped third blade surface is formed on a cutting edge of at least one of the first blade portion and the second blade portion.

[0019] According to the above configuration, even if the workpiece sandwiched between the first blade surface and the second blade surface escapes to the outside of the blade tip, the third blade surface at the tip of the saw-like blade scratches the workpiece, making it easier to cut the workpiece sandwiched between the first blade surface and the second blade surface again. The third blade surface may be provided on both the first blade portion and the second blade portion, or may be provided on only one side.

[0020] In a seventh aspect of the present invention, in any one of the first to sixth aspects of the present invention, The first blade portion has a first blade surface and a second blade surface that are arc-shaped and sharp on both sides in the sliding direction, The second blade portion has first and second arc-shaped blade surfaces that are not sharp, formed on both sides in the sliding direction.

[0021] According to the above configuration, if the first blade side of the first blade is provided with a first blade surface and a second blade surface with good cutting efficiency, even if the second blade side of the second blade is simply a receiving blade, a cutting efficiency that is not inferior to that of a conventional mowing cutting blade can be obtained, thereby reducing the number of manufacturing steps and lowering production costs.

[0022] In an eighth aspect of the present invention, in any one of the first to sixth aspects of the present invention, The first blade portion has an arc-shaped sharp blade surface formed only on one side in the sliding direction, and an arc-shaped non-sharp blade surface formed on the other side in the sliding direction, The second blade portion has an arcuate sharp blade surface formed only on one side in the sliding direction, and has an arcuate, non-sharp blade surface formed on the other side in the sliding direction.

[0023] According to the above configuration, as long as a sharp blade surface is provided on only one side of the sliding direction of the first blade portion and the second blade portion, even if a non-sharp blade surface is formed on the other side, the workpiece will be cut when the first blade and the second blade slide back and forth, thereby reducing the number of manufacturing steps and production costs.

[0024] A reaping device according to a ninth aspect of the present invention is provided with a reaping cutting blade according to any one of the first to eighth aspects of the present invention.

[0025] According to the above configuration, a highly marketable reaping device can be obtained that has a cutting blade that guides the material to be cut toward the bottom of the blade and has good cutting efficiency, as the material does not easily escape from the cutting edge toward the tip of the blade. Effect of the Invention

[0026] As described above, according to the present invention, the workpiece can be guided toward the blade bottom direction and is less likely to escape toward the blade tip direction, thereby making it possible to efficiently cut the workpiece. [Brief description of the drawings]

[0027] [Figure 1] 2 is an exploded perspective view showing a cutting mechanism in the reaping device according to an embodiment of the present invention. FIG. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a plan view showing the positional relationship between the centers of arcs of a first blade surface and a second blade surface. [Figure 4] 13(a) to 13(c) are plan views showing the relative movement between the first blade and the second blade in order from 1 to 6. FIG. [Diagram 5] FIG. 1 is a plan view showing a comparison of the blade length of the present invention with the blade length of a conventional blade. [Figure 6]FIG. 4 is an enlarged plan view showing a part of a reaping cutting blade according to a first modified example of the embodiment of the present invention. [Figure 7] FIG. 11 is an enlarged plan view showing a reaping cutting blade according to a second modified example of the embodiment of the present invention. [Figure 8] FIG. 11 is an enlarged plan view showing a reaping cutting blade according to a third modified example of the embodiment of the present invention. [Figure 9] FIG. 11 is an enlarged plan view showing a reaping cutting blade according to a fourth modified example of the embodiment of the present invention. [Figure 10] 1A to 1D are plan views showing how the angle between the blade faces decreases in sequence. [Figure 11] FIG. 1 is an enlarged plan view of a conventional reaping blade. [Figure 12] FIG. 11 is a plan view corresponding to FIG. 10 according to the conventional technology. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0029] 1 to 3 show a reaping cutting blade 1 according to an embodiment of the present invention, which comprises a first blade 2 having a plurality of first blade portions 2a arranged in a straight line at a predetermined interval, and a second blade 3 having a plurality of second blade portions 3a arranged in a straight line at a predetermined interval. The first blade 2 and the second blade 3 are overlapped and configured to cut an object to be cut (not shown) by being slid relatively.

[0030] Although not shown in detail, this cutting blade 1 for reaping is detachable from a reaping device such as a hedge trimmer, which has an electric motor for relatively moving the first blade 2 and the second blade 3, a battery for supplying power to this electric motor, and a cam mechanism for converting the rotational motion of the electric motor into relative movement between the first blade 2 and the second blade 3. It goes without saying that the reaping device may be of a wired type or an engine type.

[0031] In this embodiment, the relative movement between the first blade 2 and the second blade 3 is set by a plate-shaped support plate 4 that supports both of them, a support screw 5 fixed to the bolt insertion hole 4a, a support nut 6 to which the support screw 5 is fastened, a spacer 7 and a retaining washer 8 inserted between the support nut 6 and the support screw 5, and an elongated hole 9 into which the spacer 7 is inserted. In this embodiment, a cam member that is eccentrically connected to a rotating shaft in an unillustrated state moves within a cam ring 10 on the base side of the cutting blade 1, thereby converting the rotational motion of the electric motor into a relative linear motion between the first blade 2 and the second blade 3. The first blade 2 and the second blade 3 do not necessarily have to have this cam ring 10, and a different mechanism for converting between rotational motion and linear motion may be provided.

[0032] In this embodiment, the first blade 2 has first blade portions 2a arranged at the same pitch in vertically offset positions. The size of this pitch and the number of first blade portions 2a are not particularly limited. The first blade portions 2a may be arranged at a predetermined pitch only on one side, either the top or bottom. The first blade portion 2a has sharp arc-shaped first blade surfaces 2b and second blade surfaces 2c formed on both sides in the sliding direction.

[0033] Similarly, the second blade 3 has second blade portions 3a arranged at the same pitch in vertically offset positions. The size of this pitch and the number of second blade portions 3a are not particularly limited, but are the same as those of the first blade 2. The second blade portions 3a may be arranged at a predetermined pitch only on one side, either above or below. The second blade portion 3a has sharp arc-shaped first blade surfaces 3b and second blade surfaces 3c formed on both sides in the sliding direction.

[0034] In this embodiment, the first blade 2 and the second blade 3 have the same shape, and are supported by the support plate 4 so as to be relatively movable in a straight line, with the first blade 2 positioned on the front side and the second blade 3, which has a shape obtained by inverting the first blade 2, positioned on the back side. This reduces the number of types of parts and makes inventory management easier. The linear distance over which the first blade 2 and the second blade 3 can move relatively is set by the difference between the length of the long hole 9 and the outer diameter of the spacer 7.

[0035] As shown in FIG. 3, the centers of the arcs of the first blade surfaces 2b, 3b and the second blade surfaces 2c, 3c are located closer to the blade bottom side than the blade edges in a plan view.

[0036] Next, modified examples of the shapes of the first blade 2 and the second blade 3 of this embodiment will be described.

[0037] -Variation 1- Fig. 6 shows a reaping cutting blade 201 according to a first modified example of the embodiment of the present invention, which differs from the above-described embodiment in that the shape of the third blade surface is different. In the following modified examples, the same parts as those in Figs. 1 to 4 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0038] In this modification, sharp third blade surfaces 202d, 203d inclined at an angle of 10° to 40° (10°≦θ≦40°) with respect to the sliding direction (direction away from the main body of the mowing device) are formed on the cutting edge of the first blade portion 202a of the first blade 202 and the second blade portion 203a of the second blade 203. If θ is less than 10°, the effect of the third blade surfaces 202d, 203d cannot be fully exerted, and if θ is greater than 40°, the amount of cutting into the material to be cut is too large, and too much load is applied to the blade base.

[0039] In this modified example, even if the object to be cut that is sandwiched between the first blade surface 202b and the second blade surface 203b escapes beyond the blade tip, the object is scratched by the sharp third blade surfaces 202d, 203d with an inclined tip, making it easier to cut the object that is sandwiched between the first blade surface 202b and the second blade surface 203b again.

[0040] -Variation 2- FIG. 7 shows a reaping cutting blade 301 according to a second modification of the embodiment of the present invention, which differs from the first modification in that it has a saw-shaped blade surface (saw blades 302e, 303e).

[0041] That is, in addition to the shape of Modification 1, saw blades 302e, 303e are formed on the tip sides of first blade surface 302b and first blade surface 303b on the side opposite the reaping device of first blade portion 302a of first blade 302 and second blade portion 303a of second blade 303, respectively. Note that saw blades 302e, 303e may be formed on the tip sides of second blade surface 302c and second blade surface 303c, respectively.

[0042] According to the configuration of this modified example, the saw blades 302e, 303e catch on the workpiece sandwiched between the first blade surface 302b and the second blade surface 303c or between the first blade surface 303b and the second blade surface 302c, making it difficult for the workpiece to escape beyond the cutting edge, and the saw blades 302e, 303e improve cutting efficiency.

[0043] -Variation 3- Figure 8 shows a cutting blade 401 according to a third modified example of an embodiment of the present invention, which differs from the above embodiment in that saw-shaped blade surfaces (saw blades 402e, 403e) are formed on both sides of the cutting edge of the first blade portion 402a and the second blade portion 403a.

[0044] In this modified example, the first blade surface 402b and the second blade surface 402c of the first blade 402 are formed on both sides in the sliding direction, and the first blade surface 403b and the second blade surface 403c of the second blade 403 are formed on both sides in the sliding direction, and this differs from the above embodiment in that saw blades 402e, 403e are formed on the cutting edge sides of the first blade surfaces 402b, 403b and the second blade surfaces 402c, 403c.

[0045] According to the configuration of this modified example, the saw blades 402e, 403e provided on both sides in the sliding direction catch on the workpiece sandwiched between the first blade surfaces 202b, 203b and the second blade surfaces 202c, 203c, making it more difficult for the workpiece to escape beyond the cutting edge, and the saw blades 402e, 403e improve the cutting efficiency.

[0046] -Variation 4- Figure 9 shows a cutting blade 501 according to a fourth embodiment of the present invention, which differs from the above-described embodiment in that saw-shaped third blade surfaces 502d, 503d are formed on the cutting edges of the first blade portion 502a of the first blade 502 and the second blade portion 503a of the second blade 503, respectively.

[0047] The first blade portion 502a of the first blade 502 and the second blade portion 503a of the second blade 503 each have a saw-like third blade surface 502d, 503d formed at the cutting edge thereof.

[0048] According to the configuration of this modified example, even if an object to be cut that is sandwiched between the first blade surface 2b and the second blade surface 3c or between the first blade surface 3b and the second blade surface 2c escapes beyond the blade tip, the object is scratched by the saw-like third blade surface 502d, 503d at the tip, making it easier to cut the object again that is sandwiched between the first blade surface 2b and the second blade surface 3c or between the first blade surface 3b and the second blade surface 2c.

[0049] -Variation 5- Although not shown in detail, in this modified example, the first blade portion 2a of the first blade 2 has a first blade surface 2b and a second blade surface 2c that are arc-shaped and sharp on both sides in the sliding direction, while the second blade portion 3a of the second blade 3 has a first blade surface 2b and a second blade surface that are not arc-shaped and sharp on both sides in the sliding direction.

[0050] According to the configuration of this modified example, if a first blade surface 2b and a second blade surface 2c with good cutting efficiency are provided on both sides in the sliding direction of the first blade portion 2a on the first blade 2 side, even if the first blade surface 3b and the second blade surface 3c on the second blade 3 side are simply receiving blades, cutting efficiency that is not inferior to that of conventional mowing cutting blades can be obtained, thereby reducing the number of manufacturing steps and reducing production costs.

[0051] -Variation 6- Although not shown in detail, in this modified example, the first blade portion 2a of the first blade 2 has a sharp, arc-shaped first blade surface 2b formed only on one side in the sliding direction, while the second blade portion 3a of the second blade 3 has a sharp, arc-shaped first blade surface 3b formed only on one side in the sliding direction.

[0052] According to the configuration of this modified example, if sharp first blade surfaces 2b, 3b are provided on one side of the sliding direction of the first blade portion 2a and the second blade portion 3a, respectively, even if the second blade surfaces 2c, 3c on the other side of the sliding direction of the first blade portion 2a and the second blade portion 3a are simply receiving blades, the object to be cut will be cut when the first blade 2 and the second blade 3 slide back and forth, thereby reducing the number of manufacturing steps and production costs.

[0053] Next, the operation of the reaping cutting blade 1 according to this embodiment will be described with reference to FIGS.

[0054] As shown in FIGS. 4(a) to (c), a first blade 2 and a second blade 3 slide relatively linearly as indicated by arrows 1 to 6 due to rotation of a cam member (not shown).

[0055] Specifically, as shown in Figure 4(a), in the standby state, the spacer 7 is located on the opposite side of the long hole 9 of the first blade 2 from the main body of the mowing device, and when the mowing device begins to operate, the first blade 2 slides in the direction of the arrow 1.

[0056] As shown in FIG. 4( b ), the first edge of first blade 2 further slides in the direction of arrow 2 toward the second edge of second blade 3 .

[0057] As shown in Fig. 4(c), when first blade 2 further slides in the direction of arrow 3, the first edge of first blade 2 overlaps with the second edge of second blade 3. At this time, spacer 7 is located on the side of long hole 9 of first blade 2 that faces the reaping device body.

[0058] Then, as shown in FIG. 4(c), the first blade 2 reverses and slides in the direction of the arrow 4.

[0059] As shown in FIG. 4( b ), the first edge of first blade 2 further slides in the direction of arrow 5 toward the first edge of second blade 3 .

[0060] Then, as shown in Figure 4(a), the second blade 3 slides in the direction of the arrow 6, the spacer 7 reaches the side of the long hole 9 of the first blade 2 on the side of the harvesting device body, and the first blade of the first blade 2 overlaps with the first blade of the second blade 3.

[0061] In other words, when focusing on the first edge of the first blade 2, it can be seen that this slides relatively and linearly between the first and second edges of the second blade 3.

[0062] As shown in an enlarged view in FIG. 5, when the first blade surfaces 2b, 3b and the second blade surfaces 2c, 3c of this embodiment are compared with the first blade surfaces 102b, 103b and the second blade surfaces 102c, 103c of the prior art, it can be seen that when the blade surface shape is an arc shape as in this embodiment, the circumferential length is longer than the straight-line length as in the prior art. Therefore, even if the cutting blades are of the same height, the blade length is longer and the cutting efficiency is improved.

[0063] 10(a) to 10(d) show how the first cutting edge portion 302a of the first blade 302 and the second cutting edge portion 303a of the second blade 303 gradually approach each other in the shape of Modification 2. Of course, the same applies to the shapes of this embodiment and other modifications.

[0064] By sliding the first blade 302 and the second blade 303 relative to one another, the first blade surface 303b and the second blade surface 302c are shaped into an arc shape so that the angle formed between the first blade surface 303b of the second blade 303 and the second blade surface 302c of the first blade 302 gradually narrows in a plan view of the first blade 302 and the second blade 303.

[0065] Specifically, as shown in Figures 10(a) to (d), when the first blade portion 302a and the second blade portion 303a approach each other in a plan view, for example, by 14 mm, 10.5 mm, 7 mm, and 6 mm, the angle between the first blade surface 303b and the second blade surface 302c rapidly narrows to 81°, 43°, 20°, and 5°.

[0066] This is in stark contrast to the prior art, which has a fixed angle of 20° as illustrated in FIG.

[0067] In this way, when the first blade 302 and the second blade 303 slide relative to each other, the workpiece sandwiched between the first blade surface 303b and the second blade surface 302c is guided toward the bottom of the blade, and as the distance between the first blade surface 303b and the second blade surface 302c narrows, the angle between the blade surfaces becomes smaller, so that the workpiece is less likely to escape outside the cutting edge.

[0068] As shown in FIG. 3, the centers of the arcs of the first blade surfaces 2b, 3b and the second blade surfaces 2c, 3c are located closer to the bottom of the blade than the cutting edges when viewed in a plane. As a result, when the first blade 2 and the second blade 3 slide relative to each other, the workpiece sandwiched between the first blade surfaces 2b, 3b and the second blade surfaces 2c, 3c is less likely to escape outside the cutting edges.

[0069] Therefore, the cutting blade 1 according to the present embodiment can guide the object to be cut toward the bottom of the blade and prevent it from escaping toward the tip of the blade, so that the object can be cut efficiently. Furthermore, the object that has escaped is scratched, so that the object is more likely to be cut when it is cut again.

[0070] (Other embodiments) The present invention may be configured as follows with respect to the above embodiment.

[0071] In other words, in the above embodiment, an example was described in which the harvesting device was a hedge trimmer, but this is not limited to this, and for example, the harvesting device may be one that performs not only harvesting work, but also grass cutting, shearing, pruning, etc., and includes so-called hedge trimmers, pruning trimmers, etc.

[0072] It should be noted that the above-described embodiments are essentially preferred examples, and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of symbols]

[0073] 1 Cutting blade for reaping 2. First Blade 2a 1st blade part 2b,3b 1st blade surface 2c,3c 2nd blade surface 3. Second Blade 3a 2nd blade part 4 Support Plate 4a Bolt insertion hole 5 Support Screw 6 Support Nut 7 Spacer 8 Washers 9 long hole 10 Cam Ring 102b,103b 1st blade surface 102c,103c 2nd blade surface 201 Cutting blade for reaping 202 First Blade 202a 1st blade part 202b,203b 1st blade surface 202c,203c 2nd blade surface 202d,203d 3rd blade surface 203 2nd Blade 203a 2nd blade part 301 Cutting blade for reaping 302 First Blade 302a 1st blade part 302b 1st blade surface 302c 2nd blade surface 302e,303e saw blade 303 2nd Blade 303a 2nd blade part 303b 1st blade surface 303c 2nd blade surface 401 Cutting blade for reaping 402 First Blade 402a 1st blade part 402b,403b 1st blade surface 402c,403c 2nd blade surface 402e,403e saw blade 403 2nd Blade 403a 2nd blade part 501 Cutting blade for reaping 502 First Blade 502a First cutting edge 502d,503d 3rd cutting edge 503 2nd Blade 503a 2nd blade part

Claims

1. a first blade having a plurality of first blade portions arranged in a straight line at predetermined intervals; A second blade having a plurality of second blade portions arranged in a straight line at predetermined intervals is overlapped with the second blade. A cutting blade for reaping that cuts an object to be cut by sliding the first blade and the second blade relative to each other, The first blade portion has a first blade surface and a second blade surface each having an arc shape recessed on both sides in the sliding direction, The second blade portion has a first blade surface and a second blade surface each having an arc shape recessed on both sides in the sliding direction, The first blade surface and the second blade surface are shaped in an arc shape such that, in a plan view of the first blade and the second blade, an angle formed between a first blade surface on one side in a sliding direction of the first blade portion and a second blade surface on the other side in the sliding direction of the second blade portion and an angle formed between the second blade surface on the other side in the sliding direction of the first blade portion and the first blade surface on one side in the sliding direction of the second blade portion gradually narrow by sliding the first blade surface and the second blade surface in the plan view of the first blade and the second blade surface gradually narrow. A cutting blade for harvesting.

2. The first blade surface and the second blade surface of the first blade and the second blade have arc centers located closer to the bottom side than the cutting edge in a plan view.

2. A cutting blade for reaping according to claim 1.

3. At least one of the first blade portion and the second blade portion has a sharp third blade surface inclined at an angle of 10° to 40° with respect to the sliding direction.

2. A cutting blade for reaping according to claim 1.

4. A saw-shaped blade surface is formed on the tip side of at least one of the first blade surface and the second blade surface.

2. A cutting blade for reaping according to claim 1.

5. The first blade portion and the second blade portion have a saw-shaped blade surface formed on the cutting edge side of the first blade surface and the second blade surface.

2. A cutting blade for reaping according to claim 1.

6. At least one of the first blade portion and the second blade portion has a saw-shaped third blade surface formed on its cutting edge.

2. A cutting blade for reaping according to claim 1.

7. The first blade portion has a first blade surface and a second blade surface that are arc-shaped and sharp on both sides in the sliding direction, The second blade portion has a first blade surface and a second blade surface that are not sharp and have an arc shape on both sides in the sliding direction.

2. A cutting blade for reaping according to claim 1.

8. The first blade portion has an arc-shaped sharp blade surface formed only on one side in the sliding direction, and an arc-shaped non-sharp blade surface formed on the other side in the sliding direction, The second blade portion has an arc-shaped sharp blade surface formed only on one side in the sliding direction, and has an arc-shaped non-sharp blade surface formed on the other side in the sliding direction.

2. A cutting blade for reaping according to claim 1.

9. A cutting blade for reaping according to any one of claims 1 to 8. A harvesting device characterized by:

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