Cutting blade for harvesting and harvesting apparatus equipped therewith

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 mowing used in a mowing device such as a hedge trimmer.

Background Art

[0002] Conventionally, a mowing device such as a hedge trimmer or a swing-type clipper is known to cut grass and branches by reciprocally driving a first blade and a second blade that linearly extend and have blade portions on both sides in the width direction.

[0003] For example, as shown in FIG. 11, the cutting blade 101 for mowing of this mowing device includes a first blade 102 in which a plurality of first blade portions 102a are linearly arranged at a predetermined interval A, and a second blade 103 in which a plurality of second blade portions 103a are linearly arranged at a predetermined interval B. The first blade 102 and the second blade 103 are overlapped, and the first blade 102 and the second blade 103 are relatively slid to cut an object to be cut (not shown) such as grass and branches. Usually, the interval A and the interval B have the same length.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] And, as shown enlarged in FIGS. 12(a) to (d), in the conventional cutting blade for mowing, for example, in the process where the interval between the first blade portion 102a of the first blade 102 and the second blade portion 103a of the first blade 102 relatively approaches from 14 mm to 6 mm, the angle between the respective second blade surfaces 102c and the first blade surfaces 103b remains constant at 20°. Therefore, there is a problem that the object to be cut easily slips and escapes to the blade tip side.

[0006] The present invention has been made in view of the above, and its purpose is to effectively cut the object to be cut by guiding it toward the bottom of the blade and making it difficult for it to escape toward the tip of the blade. [Means for solving the problem]

[0007] To achieve the above objective, this invention incorporates improvements to the blade surface shapes of the first and second blades.

[0008] Specifically, in the first invention, A first blade having multiple first cutting sections arranged in a straight line at predetermined intervals, Multiple second cutting edges are superimposed on a second blade arranged in a straight line at predetermined intervals. A cutting blade for cutting, which 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 and second blade surface formed on both sides in the sliding direction, which are arc-shaped and recessed. The second blade portion has a first and second blade surface formed on both sides in the sliding direction, which are arc-shaped and recessed. By sliding the first blade and the second blade relative to each other, the first blade and the second blade are shaped into an arc shape such that, in a plan view of the first and second blades, the angle formed between the first blade surface on one side in the sliding direction of the first blade and the second blade surface on the other side in the sliding direction of the second blade, and the angle formed between the second blade surface on the other side in the sliding direction of the first blade and the first blade surface on one side in the sliding direction of the second blade, gradually narrow.

[0009] According to the above configuration, as the first blade and the second blade slide relative to each other, the material to be cut, which is sandwiched between the first and second cutting surfaces, is guided towards the bottom of the blade. Furthermore, as the distance between the first and second cutting surfaces narrows, the angle between the cutting surfaces decreases, making it difficult for the material to escape beyond the cutting edge.

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

[0011] With the above configuration, compared to a configuration where the center of the arc is located outside the cutting edge when the first and second blades slide relative to each other, the material to be cut, which is trapped between the first and second cutting surfaces, is less likely to escape outside the cutting edge.

[0012] In the third invention, in the first or second invention, At least one of the first and second cutting edges has a sharp third cutting surface that is inclined at an angle of 10° to 40° with respect to the sliding direction.

[0013] With the above configuration, even if the material to be cut, trapped between the first and second blade surfaces, moves outward beyond the cutting edge, the sharp, angled third blade surface at the tip scratches the material, making it easier to cut the material trapped between the first and second blade surfaces again. The direction of the inclination may be an upward slope toward the base of the cutting blade or a downward slope.

[0014] In the fourth invention, in any one of the first to third inventions, A saw-like cutting surface is formed on the tip side of at least one of the first and second cutting surfaces.

[0015] With the above configuration, the saw blade catches on the object to be cut sandwiched between the first and second cutting surfaces, making it difficult for it to slip outward beyond the cutting edge, and the saw blade improves cutting efficiency.

[0016] In the fifth invention, in any one of the first to fourth inventions, A saw-like cutting surface is formed on the cutting edge side of the first cutting surface and the second cutting surface of the first and second cutting surfaces of the first and second cutting portions.

[0017] According to the above configuration, since the saw-tooth-shaped blade surfaces provided on both sides in the sliding direction catch on the object to be cut sandwiched between the first blade surface and the second blade surface of the first blade and the second blade, it becomes more difficult for the object to escape to the outside than the cutting edge, and the cutting efficiency is improved by the saw-tooth-shaped blade surfaces.

[0018] In the sixth invention, in any one of the first to fifth inventions, A saw-tooth-shaped third blade surface is formed on the 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 object to be cut sandwiched between the first blade surface and the second blade surface escapes to the outside of the cutting edge, by damaging the object to be cut with the saw-tooth-shaped third blade surface at the tip, the object to be cut sandwiched again between the first blade surface and the second blade surface is easily cut. The saw-tooth-shaped third blade surface may be provided on both the first blade portion and the second blade portion, or may be provided only on one side.

[0020] In the seventh invention, in any one of the first to sixth inventions, The first blade portion has arc-shaped sharp first and second blade surfaces formed on both sides in the sliding direction, The second blade portion has arc-shaped non-sharp first and second blade surfaces formed on both sides in the sliding direction.

[0021] According to the above configuration, if the first blade portion side of the first blade is provided with the first and second blade surfaces with good cutting efficiency, even if the second blade portion side of the second blade is merely a receiving blade, a cutting efficiency not inferior to that of a conventional cutting blade for mowing can be obtained, so the number of manufacturing processes is reduced and the production cost can be lowered.

[0022] In the eighth invention, in any one of the first to sixth inventions, 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 is formed on the other side in the sliding direction, The second blade part has an arcuate sharp blade surface formed only on one side in the sliding direction, and an arcuate non-sharp blade surface is formed on the other side in the sliding direction.

[0023] According to the above configuration, if sharp blade surfaces are provided only on one side in the sliding direction of the first blade part and the second blade part, even if non-sharp blade surfaces are formed on the other side, when the first blade and the second blade slide back and forth, the object to be cut is cut, so the number of manufacturing processes is reduced and the production cost can be reduced.

[0024] The mowing device of the ninth invention includes a cutting blade for mowing according to any one of the first to eighth inventions.

[0025] According to the above configuration, an object to be cut is guided toward the blade root direction, and a mowing cutting blade with good cutting efficiency in which the object to be cut is difficult to escape from the blade tip that does not escape in the blade tip direction can be obtained, and a highly commercial mowing device can be obtained.

Effect of the Invention

[0026] As described above, according to the present invention, the object to be cut can be guided toward the blade root direction, and the object to be cut can be efficiently cut by making it difficult for the object to be cut to escape in the blade tip direction.

Brief Description of the Drawings

[0027] [Figure 1] It is an exploded perspective view showing a cutting mechanism in a mowing device according to an embodiment of the present invention. [Figure 2] It is a plan view showing a cutting part. [Figure 3] It is a plan view showing the positional relationship of the arc centers of the first blade surface and the second blade surface. [Figure 4] (a) to (c) are plan views showing the relative movement of the first blade and the second blade in order from 1 to 6. [Figure 5] It is a plan view showing a comparison between the blade surface length of the present invention and the blade surface length of the conventional one. [Figure 6]This is a plan view showing an enlarged portion of a cutting blade for harvesting according to a modified example 1 of the present invention. [Figure 7] This is an enlarged plan view showing a cutting blade for harvesting according to a modified example 2 of the embodiment of the present invention. [Figure 8] This is an enlarged plan view showing a cutting blade for harvesting according to a modified example 3 of the present invention. [Figure 9] This is a plan view showing an enlarged view of a cutting blade for harvesting according to a modified example 4 of the present invention. [Figure 10] This is a plan view showing how the angle between the blade surfaces decreases sequentially from (a) to (d). [Figure 11] This is a plan view showing a magnified view of a conventional cutting blade for harvesting. [Figure 12] This is a plan view equivalent to Figure 10 of the conventional technology. [Modes for carrying out the invention]

[0028] Embodiments of the present invention will be described below with reference to the drawings.

[0029] Figures 1 to 3 show a cutting blade 1 for harvesting according to an embodiment of the present invention. This cutting blade 1 comprises a first blade 2 in which a plurality of first blade portions 2a are arranged in a straight line at predetermined intervals, and a second blade 3 in which a plurality of second blade portions 3a are arranged in a straight line at predetermined intervals. The first blade 2 and the second blade 3 are superimposed and slid relative to each other to cut an object to be cut (not shown).

[0030] Although not shown in detail, this cutting blade 1 is detachable from a cutting device such as a hedge trimmer and includes an electric motor that moves the first blade 2 and the second blade 3 relative to each other, a battery that supplies power to the electric motor, and a cam mechanism that converts the rotational motion of the electric motor into relative movement between the first blade 2 and the second blade 3. The cutting device may be wired or engine-powered.

[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 blades, a support screw 5 fixed to the bolt insertion hole 4a of the support plate, a support nut 6 into 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, which is rotationally integrated with the rotating shaft in an eccentric state (not shown), moves within the cam ring 10 on the root side of the cutting blade 1, thereby converting the rotational motion of the electric motor into 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 this cam ring 10, and different mechanisms for converting rotational motion and linear motion may be provided.

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

[0033] Similarly, the second blade 3 has second cutting edges 3a arranged at the same pitch in vertically offset positions. The size of this pitch and the number of second cutting edges 3a are not particularly limited, but are the same as those of the first blade 2. The second cutting edges 3a may be arranged at a predetermined pitch on only one side, vertically. The second cutting edges 3a have arc-shaped sharp first cutting surface 3b and second cutting surface 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. For example, the first blade 2 is positioned on the front side, and the second blade 3, which is the reversed version of the first blade 2, is positioned on the back side. They are supported on the support plate 4 so as to be able to move linearly relative to each other. This reduces the number of parts and simplifies inventory management. The linear distance at which the first blade 2 and the second blade 3 can move relative to each other is determined by the difference between the length of the elongated hole 9 and the outer diameter of the spacer 7.

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

[0036] Next, we will describe variations in the shapes of the first blade 2 and the second blade 3 of this embodiment.

[0037] -Experimental Variation 1- Figure 6 shows a cutting blade 201 for harvesting according to Modification 1 of the embodiment of the present invention, which differs from the above embodiment in that the shape of the third cutting surface is different. In the following modifications, the same reference numerals are used for parts that are the same as in Figures 1 to 4, and their detailed descriptions are omitted.

[0038] In this modified example, the cutting edges of the first blade portion 202a of the first blade 202 and the second blade portion 203a of the second blade 203 have sharp third cutting surfaces 202d and 203d that are inclined at an angle of 10° to 40° (10°≦θ≦40°) with respect to the sliding direction (the direction away from the main body of the harvesting device). If θ is less than 10°, the effect of the third cutting surfaces 202d and 203d cannot be effectively utilized, 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 placed on the base of the blade.

[0039] In this modified example, even if the object to be cut, trapped between the first cutting surface 202b and the second cutting surface 203b, moves outward beyond the cutting edge, the sharp, angled third cutting surfaces 202d and 203d at the tip make it easier to cut the object again, which is then trapped between the first cutting surface 202b and the second cutting surface 203b.

[0040] -Variation 2- Figure 7 shows a cutting blade 301 for harvesting according to Modification 2 of the embodiment of the present invention, which differs from Modification 1 above in that it has a saw-shaped blade surface (saw blades 302e, 303e).

[0041] In other words, in addition to the shape of the modified example 1, saw blades 302e and 303e are formed on the first blade surface 302b and the tip side of the first blade surface 303b opposite to the harvesting device on the first blade portion 302a of the first blade 302 and the second blade portion 303a of the second blade 303, respectively. Furthermore, saw blades 302e and 303e may also be formed on the tip side of the second blade surface 302c and the second blade surface 303c, respectively.

[0042] According to the configuration of this modified example, the saw blades 302e and 303e catch on the object to be cut that is 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 object to escape outward beyond the cutting edge, and the cutting efficiency is improved by the saw blades 302e and 303e.

[0043] -Variation 3- Figure 8 shows a cutting blade 401 according to a modified example 3 of the present invention, which differs from the above embodiment in that saw-shaped cutting 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 cutting surface 402b and the second cutting surface 402c of the first blade 402 are formed on both sides in the sliding direction, and the first cutting surface 403b and the second cutting surface 403c of the second blade 403 are formed on both sides in the sliding direction. This differs from the above embodiment in that saw blades 402e and 403e are formed on the cutting edge side of these first cutting surfaces 402b, 403b and second cutting surfaces 402c, 403c.

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

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

[0047] The first cutting edge 502a of the first blade 502 and the second cutting edge 503a of the second blade 503 have saw-shaped third cutting surfaces 502d and 503d, respectively.

[0048] According to the configuration of this modified example, even if the object to be cut, which is trapped 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, moves outward beyond the cutting edge, the saw-like third blade surfaces 502d and 503d at the tip make scratches on the object to be cut, making it easier to cut the object trapped 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, again.

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

[0050] According to the configuration of this modified example, if the first blade portion 2a on the first blade 2 side is provided with a first blade surface 2b and a second blade surface 2c on both sides in the sliding direction, then even if the first blade surface 3b and the second blade surface 3c on the second blade 3 side are merely receiving blades, cutting efficiency no less than that of conventional cutting blades for harvesting can be obtained, thus reducing the number of manufacturing steps and lowering production costs.

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

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

[0053] Next, the operation of the cutting blade 1 for harvesting according to this embodiment will be explained using Figures 4, 5, and 10.

[0054] As shown in Figures 4(a) to 4(c), the rotation of a cam member (not shown) causes the first blade 2 and the second blade 3 to slide linearly relative to each other, as indicated by arrows 1 to 6.

[0055] Specifically, as shown in Figure 4(a), in the standby state, the spacer 7 is on the opposite side of the elongated hole 9 of the first blade 2 from the main body of the harvesting device, and when the harvesting device starts operating, the first blade 2 slides in the direction of arrow 1.

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

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

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

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

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

[0061] In other words, when we focus on the first edge of the first blade 2, we can see that it slides relatively and linearly between the first and second edges of the second blade 3.

[0062] As shown in an enlarged view in Figure 5, when comparing the first blade surfaces 2b, 3b and second blade surfaces 2c, 3c according to this embodiment with the first blade surfaces 102b, 103b and second blade surfaces 102c, 103c according to the prior art, as in this embodiment, when the blade surface shape is arc-shaped, its circumference becomes longer compared to the straight length of the prior art. Therefore, even with cutting blades of the same height, the blade length becomes longer and cutting efficiency is improved.

[0063] Next, Figures 10(a) to (d) show how the first cutting edge 302a of the first blade 302 and the second cutting edge 303a of the second blade 303 gradually approach each other, as shown in the shape of Modified Example 2. Of course, the same applies to the shapes of this embodiment and other modified examples.

[0064] By sliding the first blade 302 and the second blade 303 relative to each other, the first blade surface 303b and the second blade surface 302c are shaped into an arc shape such that, in a plan view of the first blade 302 and the second blade 303, 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.

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

[0066] This is a significant difference compared to conventional technology, which uses a constant angle of 20° as explained in Figure 12.

[0067] Thus, as the first blade 302 and the second blade 303 slide relative to each other, the material to be cut, trapped between the first cutting surface 303b and the second cutting surface 302c, is guided toward the bottom of the blade. At the same time, as the gap between the first cutting surface 303b and the second cutting surface 302c narrows, the angle between the cutting surfaces decreases, making it difficult for the material to escape beyond the cutting edge.

[0068] Furthermore, as shown in Figure 3, in a plan view, the centers of the arcs of the first cutting surfaces 2b, 3b and the second cutting surfaces 2c, 3c are located closer to the blade base than the cutting edge. Therefore, when the first blade 2 and the second blade 3 slide relative to each other, the material to be cut, which is caught between the first cutting surfaces 2b, 3b and the second cutting surfaces 2c, 3c, is less likely to escape outward from the cutting edge.

[0069] Therefore, according to the cutting blade 1 of this embodiment, the material to be cut is guided toward the bottom of the blade and made less likely to escape toward the tip of the blade, thereby enabling efficient cutting of the material to be cut. Furthermore, since the material that escapes is damaged, it becomes easier to cut the material again during re-cutting.

[0070] (Other embodiments) The present invention may also have the following configuration in the above embodiment.

[0071] In other words, although the above embodiment described an example in which the mowing device is a hedge trimmer, it is not limited to this, and for example, the mowing device may perform not only mowing work but also grass cutting, shearing, pruning, etc., and also includes so-called hedge trimmers, pruning shears, etc.

[0072] The embodiments described above 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 screws 6. Support nuts 7 Spacers 8 washers 9 long hole 10 Camring 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 Second 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 Second 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 Second Blade 403a 2nd blade part 501 Cutting blade for reaping 502 First Blade 502a First cutting edge 502d, 503d Third cutting edge 503 Second Blade 503a 2nd blade part

Claims

1. A first blade having multiple first cutting sections arranged in a straight line at predetermined intervals, Multiple second cutting edges are superimposed on a second blade arranged in a straight line at predetermined intervals. A cutting blade for cutting, which 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 and second blade surface formed on both sides in the sliding direction, which are arc-shaped and recessed. The second blade portion has a first and second blade surface formed on both sides in the sliding direction, which are arc-shaped and recessed. By sliding the first blade and the second blade relative to each other, the first blade and the second blade are shaped into an arc shape such that, in a plan view of the first and second blades, the angle formed between the first blade surface on one side in the sliding direction of the first blade and the second blade surface on the other side in the sliding direction of the second blade, and the angle formed between the second blade surface on the other side in the sliding direction of the first blade and the first blade surface on one side in the sliding direction of the second blade, gradually narrow. A cutting blade for harvesting characterized by the following features.

2. In a plan view, the first cutting surface and the second cutting surface of the first blade and the second cutting surface are such that the center of the arc is located closer to the bottom of the blade than the cutting edge of each respective blade. The cutting blade for harvesting according to feature 1.

3. At least one of the first and second cutting edges has a sharp third cutting surface that is inclined at an angle of 10° to 40° with respect to the sliding direction. The cutting blade for harvesting according to feature 1.

4. A saw-like cutting surface is formed on the tip side of at least one of the first and second cutting surfaces. The cutting blade for harvesting according to feature 1.

5. On the cutting edge side of the first and second cutting surfaces of the first and second cutting portions, a saw-shaped cutting surface is formed. The cutting blade for harvesting according to feature 1.

6. A saw-shaped third cutting surface is formed on the cutting edge of at least one of the first and second cutting portions. The cutting blade for harvesting according to feature 1.

7. The first blade portion has a first and second sharp, arc-shaped cutting surface formed on both sides in the sliding direction. The second blade portion has a first and second blade surface formed on both sides in the sliding direction, which are arc-shaped and not sharp. The cutting blade for harvesting according to feature 1.

8. The first blade portion has a sharp, arc-shaped cutting surface formed on only one side in the sliding direction, and a non-sharp, arc-shaped cutting surface formed on the other side in the sliding direction. The second blade portion has a sharp, arc-shaped cutting surface formed on only one side in the sliding direction, and a blunt, arc-shaped cutting surface formed on the other side in the sliding direction. The cutting blade for harvesting according to feature 1.

9. Having a cutting blade for harvesting according to any one of claims 1 to 8 A harvesting device characterized by the following features.

Images