Grass trimmer

Abstract

To provide a grass cutting machine that can prevent the occurrence of malfunctions where the grass cutting tines come into contact with each other. [Solution] The grass cutting workpiece 3 of the grass cutting workpiece is equipped with a rotating shaft 71 having a plurality of claw mounting parts 73 that are each located at different positions in the axial direction. Grass cutting claws 72 are detachably attached to each mounting part 73 of this rotating shaft 71 using mounting means 74. In a side view, the angle between two adjacent claw mounting parts 73 in the axial direction of the rotating shaft 71 is within the range of 135 degrees to 180 degrees.

Description

Technical Field

[0001] Embodiments of the present invention relate to a grass cutting work machine.

Background Art

[0002] Conventionally, for example, a grass cutting work machine described in Patent Document 1 below is known.

[0003] This conventional grass cutting work machine includes, for example, a machine body connected to a traveling vehicle such as a tractor, and a grass cutting work body provided on this machine body that performs a grass cutting operation while rotating. Further, the grass cutting work body has a rotating shaft having a plurality of claw attachment portions, and grass cutting claws attached to each claw attachment portion of this rotating shaft.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above conventional grass cutting work machine, since the angles formed by both claw attachment portions adjacent to each other in the axial direction of the rotating shaft in a side view are all the same 90 degrees, for example, there is a possibility that a problem may occur where the grass cutting claws contact each other during the grass cutting operation.

[0006] Therefore, one of the problems of the embodiments of the present invention is to provide a grass cutting work machine that can prevent the occurrence of problems where the grass cutting claws contact each other.

Means for Solving the Problems

[0007] An embodiment of the present invention comprises a machine body and a grass cutting work body provided on the machine body, wherein the grass cutting work body has a rotating shaft having a plurality of claw mounting parts located at different positions in the axial direction, and grass cutting claws attached to the claw mounting parts, and the angle between the two claw mounting parts that are adjacent to each other in the axial direction in a side view is within the range of 135 degrees to 180 degrees.

[0008] Furthermore, an embodiment of the present invention comprises a machine body and a grass-cutting work body provided on the machine body, wherein the grass-cutting work body has a rotating shaft having a plurality of claw mounting parts located at different positions in the axial direction, and grass-cutting claws attached to the claw mounting parts, wherein in a side view, the angle between one pair of adjacent claw mounting parts in the axial direction is one angle within the range of 135 degrees to 180 degrees, and in a side view, the angle between other pairs of adjacent claw mounting parts in the axial direction is another angle within the range of 135 degrees to 180 degrees. [Effects of the Invention]

[0009] According to embodiments of the present invention, it is possible to prevent the occurrence of problems such as the grass cutting tines coming into contact with each other. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of a grass cutting machine according to one embodiment of the present invention. [Figure 2] This is a plan view of the same grass cutting machine. [Figure 3] A front view of the same grass-cutting machine. [Figure 4] A partial front view of the grass-cutting workpiece of the same grass-cutting machine. [Figure 5] This is an enlarged view of section A in Figure 4. [Figure 6] This is an exploded perspective view showing the grass cutting tines of the same grass cutting workpiece. [Figure 7] This is a side view of the grass-cutting workpiece shown above. [Figure 8] This is a schematic side view showing the rotation range of the grass cutting tines of the grass cutting workpiece shown above. [Figure 9] This figure shows an example of attaching a balance weight to the balance weight mounting plate of the same grass-cutting workpiece. [Figure 10] This diagram shows the position of the claw attachment part to which the grass cutting claws are attached. [Modes for carrying out the invention]

[0011] One embodiment of the present invention will be described with reference to Figures 1 to 10.

[0012] In the diagram, 1 is an agricultural implement, specifically a grass cutting machine. This grass cutting machine 1 is, for example, attached to the rear of a vehicle called a tractor (not shown), and moves forward (in the direction of travel) as the tractor moves, performing the agricultural task of grass cutting (shredding grass).

[0013] More specifically, the grass cutting implement 1 is a relatively large straw chopper that is detachably connected to the three-point linkage at the rear of the tractor and moves forward (in the direction of travel) as the tractor moves forward, while shredding the grass to be cut (mainly, for example, wheat straw and green manure).

[0014] As shown in Figures 1 to 3, the grass cutting machine 1 comprises a machine body 2 that is detachably connected to a three-point linkage section (agricultural machine lifting support section) at the rear of a tractor, and a grass cutting work unit 3 that is rotatably mounted on the machine body 2 and performs grass cutting work while rotating in a predetermined rotational direction (up-cut direction) about a rotational axis X in the left-right direction.

[0015] Furthermore, the grass cutting machine 1 is equipped with a fixed cutting body (cutting aid) 5 that cuts grass such as straw between itself and the grass cutting workpiece 3, and a debris prevention body 6 that prevents debris from flying forward from the grass cutting workpiece 3. The debris from the grass cutting workpiece 3 includes, for example, stones, soil, and cut grass (shredded grass).

[0016] Furthermore, the grass cutting machine 1 includes a rear cover body 8 provided on the machine body 2 so as to be pivotally adjustable in the vertical direction about a shaft portion 7 in the left - right direction, a guide body (a discharge guide which is a deflector) 9 detachably provided on the rear cover body 8, a gauge roller 11 provided on the machine body 2 so as to be pivotally adjustable in the vertical direction about a shaft portion 10 in the left - right direction, a scraper 12 provided on the gauge roller 11 and adjustable in angle, and a stand 13 provided on the machine body 2 and adjustable in the vertical position.

[0017] The machine body 2 has a three - point connection portion 16 detachably connected (mounted) to the three - point link portion at the rear of the tractor. The three - point connection portion 16 is such that, for example, the top pin 17 and the left and right lower pins 18 are directly connected to the top link and the left and right lower links of the three - point link portion.

[0018] More specifically, in addition to the top pin 17 and the left and right lower pins 18, the three - point connection portion 16 has a top mast 19, a mast arm 20, a mast arm mounting plate 21, a stay 22, a lower pin frame 23, a hook with a lever 24, a hitch arm 25, and a hitch plate 26, etc.

[0019] The top mast 19 holding the top pin 17 is pivotally mounted at the tip of the mast arm 20 whose base end is attached to the mast arm mounting plate 21 so as to be pivotally adjustable in the vertical direction about a shaft portion 28 in the left - right direction. Therefore, for example, during grass cutting operations in the field, the machine body 2 can tilt forward and backward according to the unevenness of the field surface to follow the unevenness. A joint hanger 29 for supporting the joint is attached to the stay 22 which is a reinforcing body of the mast arm 20.

[0020] The lower pin 18 is fixed to the left and right ends of the lower pin frame 23 detachably locked by the left and right hitch arms 25 and the hook with a lever 24. The hitch arm 25 is detachably attached to the hitch plate 26.

[0021] Furthermore, the machine body 2 has a transmission case section 32, which is an input shaft holding section that rotatably holds the input shaft 31 connected to the PTO shaft at the rear of the tractor via a joint. A cylindrical frame pipe section 33, which is longitudinal in the left-right direction, is connected to the left side of this transmission case section 32 (left side when facing the direction of travel). Oil plugs 34 and 35 are detachably attached to the oil ports of the transmission case section 32 and the frame pipe section 33, and drain bolts 36 and 37 are detachably screwed into the drain ports of both.

[0022] A power transmission means 40 is connected to the input shaft 31 to transmit the power input to the input shaft 31 (power from the tractor) to the grass-cutting work unit 3, which is the work unit. The power transmission means 40 includes a transmission shaft 41 in the frame pipe section 33, a drive-side pulley 42, a driven-side pulley 43, an endless series of belts 44 (for example, five) stretched between these two pulleys 42 and 43, and a tension adjustment mechanism 45 for adjusting the tension of these belts 44.

[0023] The tension adjustment mechanism 45 consists of a tension pulley 46, a pulley arm 47, a tension rod 48, a fixing plate 49, a compression spring 50, a washer 51, and a nut 52, and the tension of the belt 44 can be adjusted by adjusting the nut 52. The tension adjustment mechanism 45, both pulleys 42 and 43, and the belt 44 are housed in a box-shaped pulley case 53. The pulley case 53 is detachably attached to the left side plate 56 of the machine body 2.

[0024] Furthermore, the machine body 2 has left and right side plates 56 that cover the sides of the grass-cutting work body 3, and a cover portion 57 that covers the front and top (front upper) of the grass-cutting work body 3. An elastic rubber cover 55, which is an elastically deformable cover, is detachably attached to the rear end of this cover portion 57. In addition, a mast arm mounting plate 21 and a hitch plate 26 are fixed to the cover portion 57.

[0025] The upper rear of the grass-cutting work unit 3 is covered by a rear cover 8 that can be opened and closed. Therefore, when the rear cover 8 is open, the shredded grass (finely cut straw, etc.) is guided in the desired direction by the guide 9 and discharged (released) to the rear. However, when the rear cover 8 is closed (in this closed state, the guide 9 must be removed), the shredded grass is discharged downwards.

[0026] The two side plates 56, which are spaced apart from each other, are connected by a rectangular reinforcing pipe 58 that is elongated in the left-right direction, and a boss 60 is detachably attached to each of these side plates 56. The grass-cutting workpiece 3 is then rotatably supported by the left and right bosses 60.

[0027] Each side plate 56 is provided with a hole 61 for mounting the front gauge wheel, a hole 62 for mounting the screw-type gauge roller, and a mounting section 63 for a stand with casters. The front gauge wheel, screw-type gauge roller, and stand with casters, which are not shown in the figure, are all optional parts.

[0028] Furthermore, the aircraft body 2 has a stand mounting section 66 to which a stand 13 used when not in operation is attached so as to be vertically adjustable, and this stand mounting section 66 is detachably attached to the hitch plate 26.

[0029] The stand 13 has one working hole 67 and multiple (e.g., three) non-working holes 68, and a pin (e.g., a pin with a hook) 70 is removably inserted into one of these holes and into a mounting hole 69 of the stand mounting portion 66 to hold it in the desired position.

[0030] On the other hand, the grass-cutting workpiece 3 performs grass-cutting work by rotating (high-speed driven rotation) in an up-cut direction, which is a predetermined rotation direction, around the rotational axis X, using power from the power transmission means 40. As shown in Figures 4 to 9, it has a left-right longitudinal rotating shaft (claw shaft) 71 having a plurality of claw mounting parts 73 located at different positions in the horizontal axial direction (left-right direction), and grass-cutting claws 72 that are detachably attached to each claw mounting part 73 of this rotating shaft 71 by mounting means 74. The mounting means 74 is, for example, a bolt 75 and a nut 76.

[0031] The rotating shaft 71 is a drive shaft that rotates in an up-cut direction about the rotational axis X with power from the power transmission means 40, and has a cylindrical shaft body portion 77 that is longitudinal in the left-right direction, and a plurality of protruding claw mounting portions 73 that are provided on the cylindrical outer surface of the shaft body portion 77 so as to protrude radially outward from the outer surface and are each located at different positions (positions offset in the axial direction) with respect to the axial direction of the rotating shaft 71.

[0032] A pulley shaft 78, which is a mounting shaft, is provided at the end face of the axial end (the end on the left side in the direction of travel) of the shaft body portion 77, and the driven pulley 43 of the power transmission means 40 is attached to this pulley shaft 78 (see Figure 3).

[0033] Each claw mounting portion 73 is composed of a pair of opposing plates 81 fixed to the outer circumferential surface of the shaft body portion 77 and spaced apart from each other, and each of these opposing plates 81 has a mounting hole 82. Each opposing plate 81 has a pair of opposing plate portions 83 spaced apart from each other and a connecting plate portion 84 that connects these two opposing plate portions 83, and a mounting hole 82 is formed in this connecting plate portion 84.

[0034] Each grass cutting tine 72 includes, for example, a pair of plate-shaped tine members (blade members) 91 that are spaced apart from each other, a plate-shaped wing member 92 located between these two tine members 91, two annular spacer members 93, and a cylindrical collar member 94. However, the grass cutting tine 72 is not limited to the members 91 to 94, and may also consist of, for example, only a pair of tine members 91 or only ginkgo-leaf shaped tine members, although these are not shown in the figures.

[0035] The claw member 91 performs grass cutting work while rotating in an up-cut direction, and has a mounting plate portion (mounting base portion) 97 in which mounting holes 96 are formed, and a blade plate portion 98 that is bent and connected to the mounting plate portion 97, and pointed blade portions 99 are formed at both ends in the width direction of the blade plate portion 98.

[0036] The blade member 92 rotates together with the claw member 91 to generate airflow in the direction of rotation (up-cut direction), and has a cylindrical portion 101 formed in a substantially cylindrical shape, and a blade portion 102 connected to the cylindrical portion 101, with its tip curved toward the direction of rotation, and a pointed blade portion 103 is formed at the tip of the blade portion 102.

[0037] Then, the collar member 94 is inserted into the mounting hole 96 of the claw member 91, the cylindrical portion 101 of the blade member 92, and the spacer member 93. The shaft portion 75a of the bolt 75 is then inserted into the collar member 94 and the mounting hole 82 of the claw mounting portion 73. Subsequently, the nut 76 is screwed onto the shaft portion 75a of the bolt 75, thereby attaching the grass cutting claw 72 to the claw mounting portion 73.

[0038] Thus, the grass cutting claws 72 are attached to the claw mounting portion 73 by mounting means 74 consisting of bolts 75 and nuts 76, such that the tips of both claw members 91 face away from each other, forming a roughly V-shape. The grass cutting claws 72 are rotatable around the shaft portion 75a of the bolt 75 relative to the claw mounting portion 73. In other words, the grass cutting claws 72 attached to each claw mounting portion 73 of the rotating shaft 71 are rotatable within a predetermined range of rotation around the rotation center axis Y in the left-right direction relative to the claw mounting portion 73. Furthermore, the two claw members 91 and the blade member 92 that constitute the grass cutting claws 72 are each rotatable independently.

[0039] Furthermore, the grass cutting claw 72 is rotatable in the circumferential direction of the shaft 75a of the bolt 75 fixed to the claw mounting portion 73, but it is not rotatable in the axial direction (left-right direction) of the shaft 75a. In other words, the base of the grass cutting claw 72 is sandwiched between the two opposing plates 81 of the claw mounting portion 73, and there is almost no gap between the claw member 91 and the opposing plates 81 (see Figure 5).

[0040] Figure 10 is a diagram showing the position of the claw mounting section 73 to which the above-described grass cutting claws 72 are attached (a claw arrangement diagram showing the corresponding claw positions). The circled numbers in this diagram number the leftmost claw mounting section 73, located at the left end of the rotating shaft 71 (the left end in the direction of travel), as "No. 1," and number the others sequentially as they move to the right (the same applies to the circled numbers in the other diagrams).

[0041] In the example shown in Figure 10, the number of grass-cutting tines 72 is, for example, 30 (the axial length of the rotating shaft 71 is approximately 2.9 m). Therefore, the tine mounting section 73 at the left end is "No. 1", the tine mounting section 73 at the right end is "No. 30", and the tine mounting sections 73 located in between are numbered "No. 2 to 29" in order from the left side to the right side in the direction of travel. All of these multiple tine mounting sections 73 are arranged at different positions (staggered positions) in the left-right direction, with equal intervals in the axial direction. As shown by the dashed line in Figure 10, the multiple tine mounting sections 73 are arranged in a roughly spiral direction on the outer circumferential surface of the shaft body 77.

[0042] Furthermore, as is clear from the angles shown in Figure 10, in this grass-cutting workpiece 3, in a side view, the angles (circumferential angle difference) between the two adjacent claw mounting portions 73 with respect to the axial direction of the rotation axis 71 are all within the range of 135 to 180 degrees (135 degrees or more and 180 degrees or less).

[0043] More specifically, in a side view, the angle formed by a plurality of adjacent double-claw mounting portions 73 with respect to the axial direction of the rotation axis 71 (e.g., the angle between portions 1 and 2, the angle between portions 3 and 4) is one angle within the range of 135 to 180 degrees, i.e., 180 degrees, and the angle formed by a plurality of other adjacent double-claw mounting portions 73 with respect to the axial direction of the rotation axis 71 in a side view (e.g., the angle between portions 2 and 3, the angle between portions 4 and 5) is another angle within the range of 135 to 180 degrees, i.e., 135 degrees.

[0044] Furthermore, the multiple claw mounting portions 73 are arranged in a substantially spiral direction at different positions with respect to the axial direction (left-right direction) of the rotation axis 71, such that only one different angle (e.g., 180 degrees) and another angle (e.g., 135 degrees) alternate sequentially from one axial end to the other axial end of the rotation axis 71.

[0045] Here, as shown in Figure 7, the angle α between the "No. 1" claw mounting portion 73 and the adjacent "No. 2" claw mounting portion 73 in a side view (the angle between the two claw mounting portions 73) is, for example, 180 degrees. Also, the angle β between the "No. 2" claw mounting portion 73 and the adjacent "No. 3" claw mounting portion 73 in a side view (the angle between the other two claw mounting portions 73) is, for example, 135 degrees. Furthermore, the angle γ between the "No. 1" claw mounting portion 73 and the two adjacent "No. 3" claw mounting portion 73 in a side view is, for example, 45 degrees.

[0046] Furthermore, the angle between the two claw mounting portions 73 in a side view from the axial direction is the angle formed by two lines passing through a point on the rotational axis X (the rotational center point of the rotation axis 71) and a point on the rotational axis Y (the rotational center points of the grass cutting claws 72, which are points separated in the circumferential direction).

[0047] As shown in Figure 7, the multiple claw mounting parts 73 are positioned radially in eight directions at equal 45-degree intervals in a side view. In other words, the multiple claw mounting parts 73 are arranged in the circumferential direction of the rotation axis 71 at equal 45-degree intervals from each other in a side view, and are equally distributed in eight directions (the same applies to the corresponding grass cutting claws 72).

[0048] In a front view, the overlap (a) of two adjacent grass cutting tines 72 is approximately 60 mm, while the gap (b) between two adjacent grass cutting tines 72 is approximately 35 mm (see Figure 4). If a gap is provided between the rotational trajectories of two adjacent grass cutting tines 72, contact between them can be avoided, but some grass will be left uncut. Therefore, it is necessary to make the rotational trajectories of two adjacent grass cutting tines 72 (the rotational trajectories of the corresponding tine mounting parts 73) overlap in a front view with respect to the axial direction of the rotation axis 71.

[0049] Furthermore, as shown in Figure 8, with respect to the claw mounting portion 73 of the rotating shaft 71, the rotation of the grass cutting claw 72 around the rotation center axis Y is restricted by the contact between the base of the grass cutting claw 72 (for example, the widthwise end face of the mounting plate portion 97 of the claw member 91) and the outer circumferential surface of the shaft body portion 77 of the rotating shaft 71.

[0050] As is clear from Figures 8(a) and (b), in this grass-cutting workpiece 3, the rotational ranges (for example, 205 degrees) of the grass-cutting claws 72 attached to the two adjacent claw mounting portions 73 in the axial direction of the rotating shaft 71 do not overlap in a side view.

[0051] More specifically, as shown in Figure 8(a), the rotational ranges of the two grass-cutting tines 72, each attached by mounting means 74 to a plurality of adjacent double-tine mounting parts (e.g., tine mounting parts 1 and 2) 73 in the axial direction of the rotating shaft 71, do not overlap in a side view, and these adjacent double-tines 72 do not come into contact (interfere) with each other. The rotational radius r of the grass-cutting tine 72 is, for example, about 177 mm, the rotational radius R of the rotation center point of the grass-cutting tine 72 is, for example, about 142 mm, and the gap dimension c between the grass-cutting tine 72 and the rotating shaft 71 is, for example, about 5 mm.

[0052] Furthermore, as shown in Figure 8(b), the rotational ranges of the double-claw tines 72 attached by mounting means 74 to multiple other double-claw mounting parts (for example, the second and third claw mounting parts) 73 adjacent to each other in the axial direction of the rotating shaft 71 do not overlap in a side view, and these adjacent double-claw tines 72 do not come into contact (interfere with each other) in any way.

[0053] Furthermore, when adjacent grass-cutting tines 72 are close to each other, the gap dimension d between them is, for example, about 3 mm. In order to secure a contact prevention gap S with this gap dimension d, it is desirable that the angle β between the "second" tine mounting portion 73 and the "third" tine mounting portion 73 be 135 degrees or more.

[0054] Furthermore, as shown in Figure 9, substantially U-shaped balance weight mounting plates 106 are provided protruding from the outer circumferential surfaces of both axial ends of the shaft body portion 77 of the rotating shaft 71 in the grass-cutting workpiece 3. The balance weight mounting plates 106 have a plurality of mounting holes 107 located in the circumferential direction of the rotating shaft 71, and plate-shaped balance weights 108 are detachably attached to the selected mounting holes 107 using bolts 109 and nuts 110 as needed.

[0055] Furthermore, it is preferable to have multiple balance weights 108 for ensuring good weight balance of the grass-cutting workpiece 3, for example, with different plate thicknesses resulting in varying weights, and to select and use them as needed. In addition, the balance weight mounting plate 106 has a recessed portion 105 formed therein to avoid interference between the balance weight mounting plate 106 and the bolt 75 when attaching or detaching the grass-cutting claws 72.

[0056] Next, we will explain the operation of the grass cutting machine 1.

[0057] With the three-point connecting section 16 of the grass cutting implement 1 directly connected to the three-point link section of the tractor, when the entire grass cutting implement 1 is moved forward by the tractor's forward movement, the grass cutting tines 72 of the grass cutting body 3 rotate at high speed in a predetermined up-cut direction about the rotational axis X together with the rotation axis 71 relative to the machine body 2, performing grass cutting work, that is, for example, shredding grass such as threshed wheat straw scattered in the field after wheat harvesting by a combine harvester.

[0058] During this grass cutting operation, the grass cutting claws 72 of the grass cutting workpiece 3 may rotate within a predetermined range of rotation about the rotation center axis Y relative to the claw mounting portion 73 of the rotating shaft 71. However, in a side view, the angles formed by the two adjacent claw mounting portions 73 with respect to the axial direction of the rotating shaft 71 are all within the range of 135 to 180 degrees (for example, a combination of two angle differences such as 180 degrees and 135 degrees). Accordingly, contact between the two adjacent grass cutting claws 72 is prevented (suppressed).

[0059] In other words, as shown in Figure 10, among the multiple claw mounting parts 73 arranged in a roughly spiral direction, the angle between two adjacent claw mounting parts 73 in that roughly spiral direction is within the range of 135 to 180 degrees (for example, a configuration where 180 degrees and 135 degrees alternate), thereby preventing contact between the grass cutting claws 72.

[0060] Therefore, with this type of grass cutting machine 1, it is possible to prevent (suppress) the occurrence of problems such as the grass cutting tines 72 coming into contact with each other during grass cutting work in fields, etc., and thus, problems such as chipping of the grass cutting tines 72 and the generation of noise due to tine contact can be appropriately prevented.

[0061] Furthermore, in conventional lawn mowing machines where the angle between the two tine mounting parts in a side view is 90 degrees, the rotation axis must be rotated by more than 90 degrees at the start of operation in order to maintain that rotation, which requires a large starting torque and places a heavy load on the tractor. However, with this lawn mowing machine 1, such a large starting torque is not required, thus reducing the load on the tractor.

[0062] Note that the number of cutting tines on the mowing body of a mowing machine varies depending on the working width of the mowing body (axial length of the rotation axis). Therefore, the example shown in Figure 10 (30 tines) is just one example, and other numbers are also acceptable.

[0063] Furthermore, the angle (angle in a side view) between the two adjacent claw mounting parts (the two claw mounting parts whose rotational trajectories partially overlap) with respect to the axial direction of the rotation axis is preferably an alternating combination of only two angles, 135 degrees and 180 degrees, but is not limited to this; for example, it may be 135 degrees only, or a combination of three or four or more angles.

[0064] Furthermore, the grass cutting machine is not limited to a configuration that prevents grass cutting at an offset position. For example, it may be configured such that a grass cutting workpiece (working section) that can be adjusted left and right relative to the tractor can be set to a desired offset position to perform grass cutting.

[0065] Furthermore, the angle of the tine mounting parts adjacent to each other in the axial direction in a side view is not limited to being based on the rotation direction of the grass cutting workpiece; for example, it may be configured to be 135 to 180 degrees in the direction opposite to the rotation direction of the grass cutting workpiece. [Explanation of Symbols]

[0066] 1. Grass trimmer 2 units 3. Grass cutting work unit 71 Rotation axis 72 Grass cutting tines 73 Claw mounting part α Angle between the two mounting parts of the claws β Angle between the other two claw mounting parts

Claims

1. The aircraft and, The aforementioned machine is equipped with a grass-cutting work unit, The aforementioned grass-cutting workpiece is A rotating shaft having multiple claw mounting portions located at different positions in the axial direction, It has a grass cutting claw attached to the claw mounting part, In a side view, the angle between the two adjacent claw mounting portions in the axial direction is within the range of 135 to 180 degrees. A grass cutting machine characterized by the following features.

2. The aircraft and, The aforementioned machine is equipped with a grass-cutting work unit, The aforementioned grass-cutting workpiece is A rotating shaft having multiple claw mounting portions located at different positions in the axial direction, It has a grass cutting claw attached to the claw mounting part, In a side view, the angle formed by one pair of adjacent claw mounting portions in the axial direction is one angle within the range of 135 degrees to 180 degrees. In a side view, the angle between the other adjacent claw mounting portions in the axial direction is any other angle within the range of 135 to 180 degrees. A grass cutting machine characterized by the following features.

3. One angle is 180 degrees, and the other angles are 135 degrees. The grass cutting machine according to feature 2.

4. Multiple claw mounting parts are positioned at different locations relative to the axial direction of the rotation axis, such that only one different angle and another angle alternate between them. The grass cutting machine according to claim 2 or 3.

5. The grass cutting tines are rotatable relative to the tine mounting portion of the rotating shaft. The rotation of the grass cutting tines is restricted by the contact between the base of the grass cutting tines and the rotating shaft. A grass cutting machine according to any one of claims 1 to 3.

6. The rotational ranges of the grass-cutting tines attached to adjacent tine mounting points on the axial direction of the rotating shaft do not overlap in a side view. The grass cutting machine according to claim 5.

7. The multiple claw attachment points are positioned radially in eight directions at 45-degree intervals when viewed from the side. A grass cutting machine according to any one of claims 1 to 3.

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