Grass trimmer

Abstract

To provide a grass cutting machine that can improve shredding performance. [Solution] The grass cutting machine comprises a grass cutting body 3 that performs grass cutting work while rotating in an upward rotation direction, and a cutting body 5 that cuts grasses K such as straw between the grass cutting claws 72 of the grass cutting body 3. The cutting body 5 has a plurality of recesses 126 through which the tips of the grass cutting claws 72 of the grass cutting body 3 pass.

Description

Technical Field

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

Background Art

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

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

[0004] And, the upper part of the grass cutting working body is covered with a cover portion (cutting portion cover), and a part of the grass is further finely crushed (cut) by the grass cutting claws while being carried around inside this cover portion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0009] Furthermore, an embodiment of the present invention provides a grass cutting machine comprising a machine body having a cutting body attachment portion, a grass cutting work body provided on the machine body, and a cutting body for cutting grass between itself and the grass cutting work body, wherein the grass cutting work body has a plurality of grass cutting tines, and the cutting body has an attachment portion attached to the cutting body attachment portion of the machine body, and a cutting portion provided on the attachment portion, and the cutting portion has a plurality of recesses through which the tips of the grass cutting tines pass. [Effects of the Invention]

[0010] According to embodiments of the present invention, shredding performance can be improved. [Brief explanation of the drawing]

[0011] [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] This is a schematic plan view of the above-mentioned grass-cutting machine (including some enlarged views). [Figure 5] This is a partial cross-sectional view of the same grass cutting machine as shown above. [Figure 6] This is a partial cross-sectional view taken along the line A in Figure 5. [Figure 7] This is an exploded perspective view showing the grass cutting tines of the same grass cutting workpiece. [Figure 8] This is a partial plan view showing the relationship between the grass-cutting tines and the cutting body of the grass-cutting workpiece. [Figure 9] This is a partially enlarged plan view of Figure 8. [Figure 10] This is a partial perspective view showing the relationship between the grass cutting claws and the cutting body of the grass cutting workpiece shown above.

Embodiment for Carrying Out the Invention

[0012] One embodiment of the present invention will be described with reference to FIGS. 1 to 10.

[0013] Reference numeral 1 in the drawings is a mowing work machine which is an agricultural work machine. This mowing work machine 1 is connected to the rear part of a tractor (not shown) which is a traveling vehicle, for example, and performs a mowing work (a work of shredding grasses) which is an agricultural work while moving forward (in the traveling direction) by the traveling of the tractor.

[0014] More specifically, the mowing work machine 1 is a relatively large straw chopper which is detachably connected to the three-point link part (an agricultural work machine lifting support part) at the rear part of the tractor, and shreds grasses to be mowed (mainly, for example, wheat straws, green manures, etc.) while moving forward (in the traveling direction) by the forward traveling of the tractor.

[0015] As shown in FIGS. 1 to 3 and the like, the mowing work machine 1 includes a machine body 2 which is detachably connected to the three-point link part (an agricultural work machine lifting support part) at the rear part of the tractor, and a mowing work body 3 which is rotatably provided on the machine body 2 and performs a mowing work while rotating in a predetermined rotation direction (an up-cut direction) about a rotation center axis X in the left-right direction.

[0016] Further, the mowing work machine 1 includes a fixed cutting body (a cutting auxiliary tool) 5 which cuts grasses such as wheat straws between the mowing work body 3, and a scattering prevention body 6 which prevents the forward scattering of scattered materials from the mowing work body 3 side. Note that the scattered materials from the mowing work body 3 side are, for example, stones, earth and sand, mowed grasses (shredded grasses), etc.

[0017] 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.

[0018] 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.

[0019] More specifically, the three-point connection portion 16 includes, in addition to the top pin 17 and the left and right lower pins 18, 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, a hitch plate 26, and the like.

[0020] 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 work in the field, the machine body 2 can tilt forward and backward according to the unevenness of the field surface and 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.

[0021] 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.

[0022] 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 filler ports of the transmission case section 32 and the frame pipe section 33, and drain bolts 36 and 37 are detachably attached to the drain ports of both.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] On the other hand, the grass-cutting workpiece 3 performs grass-cutting work by rotating (high-speed driven rotation) in a predetermined rotational direction, the up-cut direction, around the rotational axis X, using power from the power transmission means 40. As shown in Figures 5 to 7, 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.

[0032] 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.

[0033] 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).

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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 6).

[0041] Furthermore, the number of grass cutting tines 72 varies depending on the working width of the grass cutting workpiece 3 (axial length of the rotating shaft 71). For example, there are 30 tines (the axial length of the rotating shaft 71 is approximately 2.9 m), and the number of corresponding tine mounting parts 73 is the same.

[0042] Furthermore, 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 is one angle within the range of 135 degrees 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 is another angle within the range of 135 degrees 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] On the other hand, as shown in Figures 4, 5, 8 to 10, etc., the grass cutting machine 1 is equipped with a plate-shaped cutting body (fixed cutting body) 5 that is elongated in the left-right direction and cuts grass (such as straw) between a plurality (for example, 30) of grass cutting tines 72 that rotate in the up-cut direction.

[0046] The cutting body 5 is composed of multiple cutting members arranged in the left-right direction, which is the axial direction of the rotation axis 71 of the grass-cutting work body 3. For example, it consists of two identical cutting members (divided cutting bodies) 111 that are divided into left and right halves and have a longitudinal shape in the left-right direction. Each cutting member 111 is detachably attached to the cutting body mounting portion (mounted plate portion) 112 of the machine body 2 by multiple mounting means 113. The mounting means 113 are, for example, bolts 114 and nuts 115.

[0047] The cut body attachment portion 112 of the machine body 2 is formed at the front lower end of the cover portion 57 that covers the front and front upper part of the grass cutting work body 3. That is, for example, the cover portion 57 of the machine body 2 has a cylindrical portion (box-shaped portion) 116 for reinforcement that is longitudinal in the left-right direction at its front lower end, and a plate-shaped cut body attachment portion (protruding plate) 112 that is longitudinal in the left-right direction protrudes downward from the rear end of the lower plate 117 of this cylindrical portion 116, and this protruding cut body attachment portion 112 is the front lower end of the cover portion 57.

[0048] Multiple mounting holes 118 are formed in the cut body mounting section 112, specifically in 12 locations spaced apart in the left-right direction, for example, to attach the cutting members 111 that make up the cut body 5.

[0049] Furthermore, a debris containment body 6 is positioned in front of the cut body 5. This debris containment body 6 has a left-right longitudinal shaft member 107 attached to a mounting plate (hanging plate) 106 protruding from the lower plate 117, and a plurality of detachable debris containment members 108 supported by this shaft member 107 so as to be rotatable in the front-rear direction. Each of these plurality of debris containment members 108 can be individually attached to and detached from the shaft member 107.

[0050] The cutting member 111 has a vertical plate-shaped mounting portion (mounting plate portion) 121 that is elongated in the left-right direction and detachably attached to the cutting body mounting portion 112 of the machine body 2, a horizontal plate-shaped cutting portion (cutting plate portion) 122 that is elongated in the left-right direction and projecting rearward from the lower end of the mounting portion 121 and cuts (shreds) grass between itself and a plurality of grass cutting tines 72, and a plurality of vertical plate-shaped reinforcing portions (reinforcing plate portions) 123 that are provided between the mounting portion 121 and the cutting portion 122 and are oriented in the front-rear direction. The front surface of the reinforcing portion 123 is fixed to the rear surface of the mounting portion 121, and the lower surface is fixed to the upper surface of the protruding portion 127 of the cutting portion 122.

[0051] The mounting portion 121 has a plurality of mounting holes 124 that correspond to the mounting holes 118 of the cutting portion mounting portion 112. Bolts 114 are inserted into both of these mounting holes 118 and 124, and nuts 115 are screwed onto the bolts 114, thereby attaching the mounting portion 121 of the cutting member 111 to the cutting portion mounting portion 112.

[0052] The cutting portion 122 has a plurality of recessed portions 126 arranged side by side in the left-right direction on the rear side of the cutting portion 122, and a plurality of protruding portions 127 arranged between the two adjacent recessed portions 126 in the left-right direction on the rear side of the cutting portion 122, and the recessed portions 126 are formed in a concave shape corresponding to the rotational trajectory of the claw member 91 of the grass cutting claw 72.

[0053] Furthermore, when the grass-cutting workpiece 3 rotates (during grass-cutting work), the tip of the claw member 91 of the grass-cutting claw 72, which rotates in the up-cutting direction, passes through the inner space 130 of the recessed portion 126, and the tip of the blade member 92 of the grass-cutting claw 72, which rotates in the up-cutting direction, passes near the rear of the convex portion 127.

[0054] As a result, the cutting action between the tip of the grass cutting claw 72 rotating in the up-cutting direction and the cutting portion 122 of the cutting member 111 fixed to the front lower end of the cover portion 57 causes the grass to be cut (for example, grass such as straw that gets caught and raked up by the rotating grass cutting claw 72 as shown in Figure 10) to be finely cut by being sandwiched between the two.

[0055] Here, with reference to Figure 9, the specific shape of the recessed portion 126 having an inner space 130 through which the tip of the claw member 91 passes will be described.

[0056] As shown in Figure 9, the recessed portion 126, in a plan view, has a single left-right linear portion 131 aligned in the left-right direction, two parallel front-rear linear portions 132 aligned in the front-rear direction, and two inclined linear portions 133 that form a roughly V-shape aligned in a direction inclined at a predetermined inclination angle θ (for example, θ is 45 degrees) with respect to the front-rear direction. These continuous planar linear portions (linear planar portions having pointed corners at least at their lower ends) 131, 132, and 133 are located facing the inner space 130 of the rear-opening recessed portion 126.

[0057] The tip of the claw member 91 of the grass cutting claw 72 passes through the portion of the inner space 130 of the recess 126 that is located between the two front and rear straight sections 132 that are spaced apart from each other. At this time, the tip edge of the claw member 91 passes through the inner space 130 near the opposing positions of the inclined straight section 133 and the front and rear straight sections 132. The gap dimension a between the tip edge of the claw member 91 and the inclined straight section 133 is, for example, about 10 mm, and the gap dimension b between the tip edge of the claw member 91 and the front and rear straight sections 132 is also, for example, about 10 mm. On the other hand, the gap dimension c between the corner portion of the tip of the claw member 91 and the left and right straight sections 131 is slightly larger than gap dimensions a and b, for example, about 12 mm.

[0058] Furthermore, the tip edge of the blade member 92 of the grass cutting tines 72 passes not within the recessed portion 126, but near opposing positions of the left and right linear portions (linear surface portions having pointed corners at least at their lower ends) 135, which are left and right portions formed along the left-right direction at the tip (rear end) of the convex portion 127. The gap dimension d between the tip edge of the blade member 92 and the left and right linear portions 135 is slightly larger than the gap dimension c, for example, about 15 mm. Also, the left-right dimension of the tip edge of the blade member 92 is larger than the left-right dimension of the left and right linear portions 135. The values ​​of the gap dimensions a, b, c, and d are arbitrary, and they may all be the same value as long as there is a gap greater than the predetermined value.

[0059] On the other hand, as shown in Figure 4, with respect to the two cutting members 111 that make up the cut body 5, the gap dimension e between the left cutting member 111 and the right cutting member 111 is, for example, about 13 mm.

[0060] Furthermore, as is clear from Figure 4, the recessed portions 126 located at both ends in the left-right direction of each cut member 111 differ from other ordinary recessed portions 126 in that approximately half of them are cut out, so there is only one front-to-back straight portion 132 and one inclined straight portion 133.

[0061] Furthermore, the distance f1 between the front-to-back straight section 132 of the recess 126 located at the right end of the left cutting member 111 and the front-to-back straight section 132 of the recess 126 located at the left end of the right cutting member 111 is, for example, about 80 mm, and the distance f2 between the two front-to-back straight sections 132 of the other normal recess 126 is also, for example, about 80 mm.

[0062] In the illustrated example, the cut body 5 consists of two cut members 111 divided into two in the left-right direction, but it may also consist of three or more cut members divided into three or more sections, or it may consist of a single continuous cut member, for example.

[0063] Next, we will explain the operation of the grass cutting machine 1.

[0064] 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.

[0065] During this grass cutting operation, the grass to be cut (such as straw) is shredded by the grass cutting claws 72 as it is moved around within the cover portion 57 of the machine body 2, and is also shredded by the cutting action between the tip of the grass cutting claws 72 (the blade portion 99 at the tip of the claw member 91 and the blade portion 103 at the tip of the blade member 92) and the lower rear corner of the cutting portion 122 of the cutting body 5 (see Figure 10).

[0066] Furthermore, 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), so that contact between the two adjacent grass cutting claws 72 is prevented (suppressed). In addition, the tip of each grass cutting claw 72 passes near the rear end of the cutting portion 122, but does not come into contact with the cutting portion 122.

[0067] Therefore, the above-described grass cutting machine 1 is equipped with a cutting body 5 that cuts (shreds) grass by sandwiching it between the grass cutting claws 72 of the rotating grass cutting work body 3 which rotates in the up-cut direction. Since the cutting body 5 has a plurality of recesses 126 through which the tips of the grass cutting claws 72 of the grass cutting work body 3 pass, it is possible to appropriately shred grass regardless of the shape, hardness, or type of grass to be cut, thereby improving shredding performance.

[0068] Furthermore, for example, during grass cutting work in fields, it is possible to prevent (suppress) the occurrence of problems such as contact between the grass cutting tines 72 and the cutting part 122, or contact between the grass cutting tines 72 themselves. Thus, problems such as chipping of the grass cutting tines 72 or the generation of noise due to tine contact can be appropriately prevented.

[0069] 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 unit) that can be adjusted left and right relative to the tractor can be set to a desired offset position to perform grass cutting. [Explanation of symbols]

[0070] 1. Grass trimmer 2 units 3. Grass cutting work unit 5 cut body 57 Cover section 72 Grass cutting tines 91 Claw member 92 Blade component 112 Cut section mounting part 121 Mounting part 122 Cutting section 123 Reinforcement section 126 Concave part 127 Convex part 130 Interior space 133 Inclined section, inclined straight section K Grass

Claims

1. The aircraft and, The aforementioned machine is equipped with a grass-cutting work unit, The system includes a cutting body for cutting grass and other plants, between the aforementioned grass-cutting work body and the cutting body. The aforementioned grass-cutting workpiece has multiple grass-cutting tines, The cutting body has a plurality of recesses through which the tip of the grass cutting claw passes. A grass cutting machine characterized by the following features.

2. A machine having a section for attaching the cut body, The aforementioned machine is equipped with a grass-cutting work unit, The system includes a cutting body for cutting grass and other plants, between the aforementioned grass-cutting work body and the cutting body. The aforementioned grass-cutting workpiece has multiple grass-cutting tines, The cut body is The mounting portion attached to the cutting body mounting portion of the aforementioned machine, The mounting portion has a cutting portion, The cutting portion has a plurality of recesses through which the tip of the grass cutting claw passes. A grass cutting machine characterized by the following features.

3. The attachment part for the cut body is detachable from the attachment part for the cut body on the machine. The grass cutting machine according to feature 2.

4. The machine has a cover section that encloses the grass-cutting workpiece. The attachment portion of the cut body of the machine is formed at the lower end of the cover portion. The grass cutting machine according to claim 2 or 3.

5. The cut section has a reinforcing section provided between the mounting section and the cut section. The grass cutting machine according to claim 2 or 3.

6. The grass cutting tines are A claw component that performs grass cutting work while rotating, It has a blade member that rotates together with the claw member and generates wind in the direction of rotation, The tip of the claw member passes through the inner space of the recessed portion, The tip of the wing member passes near the convex portion between adjacent recesses. A grass cutting machine according to any one of claims 1 to 3.

7. The concave portion has an inclined portion that is inclined in a direction relative to the front-to-back direction in a plan view. The tip of the claw member passes near the inclined portion in the inner space of the recess. The grass cutting machine according to feature 6.

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