Mowing implement

Abstract

To provide a mowing implement capable of efficiently performing mowing operation.SOLUTION: A mowing implement is used by detachably connecting to a tractor. The mowing implement includes an operation body 51 performing mowing operation while being rotated in the up-cut direction, and a cover body 71 for covering the upper side of the operation body 51. The mowing implement also includes a space part 70 which is positioned between a rotation locus 65 of the operation body 51 and the cover body 71, and gradually becomes large toward the up-cut direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a grass cutting work machine that is detachably connected to a traveling vehicle and used.

Background Art

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

[0003] This conventional grass cutting work machine is, for example, detachably connected to the rear part of a tractor which is a traveling vehicle and used, and includes a working body that performs a grass cutting operation while rotating in an up-cut direction which is a predetermined rotation direction based on the power from the tractor side, and a cover body that covers the upper side of this working body.

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, for example, depending on the type and amount of grass to be cut, etc., the grass (such as cut grass) cut by the working body rotating in the up-cut direction may be clogged inside the cover body, and there is a possibility that the working efficiency may decrease.

[0006] One of the problems of the present invention is to provide a grass cutting work machine that can perform a grass cutting operation efficiently.

Means for Solving the Problems

[0007] The lawn mowing machine according to an embodiment of the present invention is a lawn mowing machine used by being connected to a traveling vehicle, and includes a working body that performs a lawn mowing operation while rotating in an up-cut direction, a cover body that covers the upper side of the working body, and a space portion that is formed between the rotation locus of the working body and the cover body and that becomes larger toward the up-cut direction.

Effect of the Invention

[0008] According to the embodiment of the present invention, lawn mowing work can be efficiently performed.

Brief Description of the Drawings

[0009]

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Mode for Carrying Out the Invention

[0010] One embodiment of the present invention will be described with reference to FIGS. 1 to 7.

[0011] Reference numeral 1 in the figure denotes a lawn mower, which is a flail mower (agricultural working machine) that is connected (mounted) to the rear part of a tractor (not shown), which is a traveling vehicle, and used.

[0012] That is, the lawn mower 1 is detachably connected to the rear part of the tractor, and performs a lawn mowing operation, which is an agricultural operation, while moving forward (in the traveling direction) due to the traveling of the tractor.

[0013] More specifically, the lawn mower 1 is connected to the three-point link part (agricultural working machine mounting device) at the rear part of the tractor, and while moving forward due to the forward traveling of the tractor, cuts and shreds grasses (for example, weeds, wheat straws, secondary ears, green manure, etc.) W to be cut. Note that this lawn mower 1 is an offset working machine that can be offset to the side of the tractor, that is, for example, to the right side.

[0014] The lawn mower 1 includes a mounting part 5 that is detachably connected (mounted) to the three-point link part at the rear part of the tractor, a working part 6 that can be changed between a stored state and an offset state and can be changed between a horizontal posture and an inclined posture, and mainly performs a lawn mowing operation in a desired offset state, and a connecting part (offset mechanism part) 7 that connects the front and rear mounting part 5 and working part 6.

[0015] Further, this lawn mower 1 includes an operation part (not shown) such as a remote controller operated by an operator on the tractor, a drive part 12 for moving the working part 6 to change the state and posture of the working part 6, a first detection part 13 for detecting an offset amount (state of the working part) of the working part 6 with respect to the tractor, a second detection part 14 for detecting a posture angle (posture of the working part) of the working part 6 with respect to the tractor, and a control part (control box) 15 for controlling the drive part 12 based on information from these first detection part 13, second detection part 14, and operation part.

[0016] And the drive unit 12 includes a first cylinder (offset cylinder) 16 which is a first drive means for offset that is extensible and retractable to move the working unit 6 in the left - right direction with respect to the mounting unit 5, and a second cylinder (tilt cylinder) 17 which is a second drive means for posture change that is extensible and retractable to rotate the working unit 6 in the up - down direction about the rotation center axis (rotation fulcrum) 11 in the front - rear direction with respect to the connecting unit 7. Each of the cylinders 16, 17 is, for example, an electro - hydraulic cylinder. Also, each of the detection units 13, 14 is, for example, a potentiometer, and both are arranged within the covers 18, 19.

[0017] Here, the working unit 6 can perform mowing operations not only in the offset state but also in the stored state where it is stored in the rear part of the tractor. The stored state means a state where the working unit 6 is located at the storage position behind the tractor (a position where substantially the whole of the working unit 6 is stored within the width of the tractor). The offset state means a state where the working unit 6 is located at an offset position shifted by a desired offset amount (movement amount) to the right side from the storage position behind the tractor.

[0018] And the working unit 6 can move in the left - right direction with respect to the tractor (mounting unit) by the extension and retraction of the first cylinder 16 between the storage position and the maximum offset position, and can be positioned at these two positions and any position between these two positions.

[0019] Also, in the offset state, the working unit 6 can perform mowing operations in any posture, including a horizontal posture along the left - right direction and upward / downward inclined postures (an upward inclined posture with the left side lower and the right side higher and a downward inclined posture with the left side higher and the right side lower).

[0020] And the working unit 6 can rotate in the up - down direction about the rotation center axis 11 in the front - rear direction with respect to the tractor (mounting unit) by the extension and retraction of the second cylinder 17 between the maximum upward position and the maximum downward position, and can be positioned at these two positions and any position (including the horizontal position) between these two positions.

[0021] The mounting portion 5 has a hitch frame 21 which is a mounting frame, and a three-point connection portion 22 is provided on the hitch frame 21 so as to be detachably connected to the three-point link portion at the rear of the tractor. The three-point connection portion 22 has a top mast 24 holding a top pin 23 and a pair of left and right lower arms 26 holding lower pins 25.

[0022] Also, an input shaft holding portion 29 that rotatably holds an input shaft 28 for inputting power from the tractor side is provided on the hitch frame 21. The input shaft 28 is connected to a PTO shaft of a tractor (not shown) via a joint, and inputs the power from the PTO shaft side to the lawn mower 1 side. Further, an arm attachment portion 30 is provided on the right side of the hitch frame 21.

[0023] The connecting portion 7 has a connecting arm (parallel link) 41 which is two rotating arms whose front end portions are rotatably attached to the arm attachment portion 30 via a shaft 46, and an arm attachment member 42 whose rear end portion of the connecting arm 41 is rotatably attached via a shaft 47.

[0024] Also, a rotation center axis 11 in the front-rear direction is fixed to the arm attachment member 42, and this rotation center axis 11 is held by a shaft holding member 45 of the working portion 6. That is, the working portion 6 can rotate in the vertical direction about the rotation center axis 11 in the front-rear direction fixed to the arm attachment member 42.

[0025] And the second detection portion 14 detects the rotation angle of the shaft holding member 45 with respect to the rotation center axis 11, in other words, the rotation angle of the working portion 6 with respect to the mounting portion 5, and transmits the information to the control portion 15. Also, the first detection portion 13 detects the rotation angle of the connecting arm 41 with respect to the mounting portion 5 and transmits the information to the control portion 15. Note that the first detection portion 13 is attached to the arm attachment portion 30 of the mounting portion 5, and the second detection portion 14 is attached to the shaft holding member 45 of the working portion 6.

[0026] The working unit 6 includes a working body 51 which is a working means for performing a grass cutting operation (an operation of cutting and shredding the grass growing on the working surface) while rotating in an up-cut direction (the direction of the arrow in the figure) which is a predetermined rotation direction, a cover means 52 for covering the working body 51, a gauge roller 50 which is a ground wheel disposed behind the working body 51, and a scraper 49 for removing the attachments (such as soil) adhering to the gauge roller 50.

[0027] Further, the working unit 6 includes a pulley case 53 which is a first transmission case body in which a plurality of pulleys 56, 57, 58 and a belt 59 are stored, and a gear case 54 which is a second transmission case body in which a plurality of gears (not shown) are stored.

[0028] The belt 59 in the pulley case 53 is wound around a driving-side pulley 56, a driven-side pulley 57 and a tension pulley 58, and this tension pulley 58 is urged by an elastic body 60. The urging force by this elastic body 60 can be adjusted by a tension bolt 55.

[0029] Also, the intermediate input shaft 31 is rotatably held by the gear case 54, and a power transmission means 33 for transmitting the power from the input shaft 28 is connected to the intermediate input shaft 31. Then, the power input from the power transmission means 33 to the intermediate input shaft 31 is transmitted to the working body 51 via the gears in the gear case 54 and the belt 59 in the pulley case 53, etc. As a result, the working body 51 is driven to rotate in the up-cut direction to perform the grass cutting operation.

[0030] The working body 51 includes a rotation shaft 61 which is longitudinally long in the left-right direction, and a plurality of grass cutting claws 64 which are detachably attached to the claw attachment portion 62 of the rotation shaft 61 via an attachment member 63 and perform a grass cutting operation while rotating in the up-cut direction.

[0031] Note that the rotation locus 65 of the working body 51 is a circular locus (a circular claw tip movement locus centered on the rotation center of the working body) drawn by the tip of the grass cutting claw 64 which moves along the up-cut direction when the working body 51 rotates.

[0032] The cover means 52 includes a cover body 71 that is longitudinally long in the left - right direction and substantially plate - shaped and covers the upper side of the working body 51, and left and right cover side plates 72 that cover the side of the working body 51. The rotation axis 61 of the working body 51 is rotatably installed on both of these cover side plates 72. Further, a lower side plate 73 is detachably provided at the lower part of each cover side plate 72.

[0033] And, as shown in FIG. 3, in a side view, a space portion 70 in which the space width (the interval which is the rotation locus of the working body and the distance between the cover bodies) gradually increases step - by - step (it may be stepless as shown in FIG. 8 described later) in the up - cut direction which is a predetermined rotation direction (the clockwise direction in FIG. 3, that is, the rotation direction in which the mowing claws 64 move from the front side to the rear side at the upper part of the working body 51) is formed between the rotation locus 65 of the working body 51 and the inner surface of the cover body 71.

[0034] That is, a space portion 70 that gradually widens from the front side to the rear side is formed between the rotation locus 65 of the working body 51 and the surface (inner surface) of the cover body 71 that faces the working body 51.

[0035] Here, the cover body 71 has a cover main body member 76 having a cutting member attachment portion 75 which is a cylindrical portion with a substantially square cross - section at the front end side, a rear cover member 78 that is rotatably installed on both cover side plates 72 so as to be able to rotate up and down around a shaft portion 77 in the left - right direction, and a cutting member (a reinforcing member and cutting member that also serves as a reinforcement for the cover main body member) 79 that is fixedly attached to the cutting member attachment portion 75 of the cover main body member 76 and cuts the grass W. Note that the cutting member 79 fixed to the cutting member attachment portion 75 on the front end side of the cover body 71 is located in front of the rotation axis 61 of the working body 51 in a side view.

[0036] The cover body member 76 has a plurality of longitudinally extending members in the left-right direction and in the form of plates, that is, for example, four cover plates 81 to 84. That is, the cover body member 76 includes a first cover plate portion 81 positioned in an inclined shape with the front lower and the rear higher, a second cover plate portion 82 positioned in an inclined shape with a gentler inclination than the first cover plate portion 81 and with the front lower and the rear higher, a third cover plate portion 83 positioned horizontally, and a fourth cover plate portion 84 positioned in an inclined shape with the front higher and the rear lower.

[0037] On the front surface of the cutting member attachment portion 75 of the cover body member 76, an elastic plate 80 such as guard rubber that can be elastically deformed is attached. Also, on the front surface of the cutting member attachment portion 75 of the cover body member 76, a plate-shaped cylinder cover member 40 that covers the front side of the second cylinder 17 is attached together with the elastic plate 80 by a fixture (for example, bolts and nuts, etc.) 39 in a state of being clamped together. Thereby, it is possible to suppress grass W such as tall grass or cut grass rebounding from the front side from contacting the rod or wiring of the second cylinder 17.

[0038] The rear cover member 78 has a vertically rotatable rear cover plate portion 85 that is longitudinally extending in the left-right direction and in the form of a plate, and left and right side plate portions 86 provided at both ends in the left-right direction of the rear cover plate portion 85 (see FIG. 5).

[0039] The cutting member 79 is, for example, composed of an L-shaped longitudinally extending angle member in the left-right direction, and includes a first plate portion 91 positioned horizontally, a second plate portion 92 positioned vertically, and a cutting corner portion 93 formed between the first plate portion 91 and the second plate portion 92 for cutting grass W.

[0040] As shown in FIG. 4, the first plate portion 91 is fixed to the lower surface portion 75a of the cutting member attachment portion 75, and the second plate portion 92 is fixed to the rear surface portion 75b of the cutting member attachment portion 75. That is, the cutting member 79 is fixed so as to overlap and cover the corner portion where the lower surface portion 75a and the rear surface portion 75b intersect in the angular cylinder-shaped cutting member attachment portion 75.

[0041] Note that the angle θ formed by the first plate portion 91 and the second plate portion 92 is preferably, for example, 60° to 90°, and in the illustrated example, "θ = 90°". Further, the corner portion 93 for cutting is formed not in an arc shape but in a sharp and pointed shape (for example, a right-angled shape).

[0042] And between the inner surface (the surface facing the working body) of the cover body 71 composed of such a cutting member 79, the cover body member 76, and the rear cover member 78, and the rotation locus 65 of the working body 51 that can rotate in the up-cut direction, a space portion 70 that gradually increases in the up-cut direction is formed.

[0043] That is, for example, as shown in FIG. 3, the distance A2 between the first cover plate portion 81 of the cover body member 76 and the rotation locus 65 of the working body 51 is larger than the distance A1 between the second plate portion 92 of the cutting member 79 and the rotation locus 65 of the working body 51, and the distance A3 between the second cover plate portion 82 of the cover body member 76 and the rotation locus 65 of the working body 51 is larger than this distance A2, and the distance A4 between the third cover plate portion 83 of the cover body member 76 and the rotation locus 65 of the working body 51 is larger than this distance A3, and the distance A5 between the fourth cover plate portion 84 of the cover body member 76 and the rotation locus 65 of the working body 51 is larger than this distance A4, and the distance A6 between the rear cover plate portion 85 of the rear cover member 78 and the rotation locus 65 of the working body 51 is larger than this distance A5.

[0044] In short, the space portion 70 located between the cover body 71 and the rotation locus 65 of the working body 51 gradually increases from the front side to the rear side so as to satisfy "A1 < A2 < A3 < A4 < A5 < A6". Note that the space width, which is the distance A1 between the second plate portion 92 of the cutting member 79 and the rotation locus 65 of the working body 51, that is, the space width of the lower opening-shaped entrance portion of the space portion 70 is the smallest compared to the space widths in other portions.

[0045] In the example illustrated in FIG. 3, taking an example of specific dimensions, for example, "A1 = 22 mm", "A2 = 24 mm", "A3 = 26 mm", "A4 = 35 mm", "A5 = 50 mm", "A6 = 98 mm". However, "A6 = 98 mm" is the dimension in the fully closed state of the rear cover member 78.

[0046] That is to say, as described below, since the rear cover member 78 is rotatably adjustable in the vertical direction, the distance A6 changes according to the rotational adjustment of the rear cover member 78, but it is always the largest compared to the space widths in other parts.

[0047] Also, as shown in FIGS. 5 to 7, the rear cover member 78 of the cover body 71 is rotatably adjustable in the vertical direction about the left - right shaft portion 77 with respect to the left - right cover side plates 72, that is, it can be rotatably adjusted in four steps (it may be stepless instead of stepped) as shown by the two - dotted chain line in FIG. 7 for example. Therefore, the size of the portion located between the rear cover plate portion 85 and the rotation locus 65 of the working body 51 in the space portion 70 can be adjusted.

[0048] In addition, the arrows in FIGS. 5 and 6 indicate the flow of the cut grass (mowed grass, etc.) W cut by the mowing claws (cutting blades) 64 of the working body 51 that rotates in the up - cut direction.

[0049] Specifically, the cover side plate 72 has a plurality, that is, for example, four adjustment holes 101 (101a, 101b, 101c, 101d) arranged on a virtual circle centered on the shaft portion 77.

[0050] The adjustment hole 101 (101a) is a hole for the fully closed position used when fixing the rear cover member 78 to the fully closed position to make it in the fully closed state. The adjustment holes 101 (101b, 101c) are holes for the intermediate position used when fixing the rear cover member 78 to the intermediate position (standard position) to make it in the intermediate state. The adjustment hole 101 (101d) is a hole for the fully open position used when fixing the rear cover member 78 to the fully open position to make it in the fully open state.

[0051] When the adjustment hole 101a (fully closed position) is used, the cut grass hits the rear cover member 78 and is returned to the working part 6 side, leading to an improvement in shredding performance. When the adjustment hole 101b (one of the intermediate positions and the standard position) is used, a grass cutting operation with a good balance between shredding performance and discharge performance becomes possible. Furthermore, when the adjustment hole 101c (yet another intermediate position) or the adjustment hole 101d (fully open position) is used, by rotating the rear cover member 78 upward more than in the standard position, the influence of the rear cover member 78 during grass discharge is reduced, the discharge performance is improved, and clogging inside the working part 6 is reduced. Therefore, speeding up etc. is possible, the working efficiency is improved, and it is possible to suppress the shredding of the cut grass.

[0052] In addition, the side plate portion 86 of the rear cover member 78 has an opposing hole 102 that opposes one adjustment hole 101 selected from the plurality of adjustment holes 101 in the cover side plate 72.

[0053] And a bolt 103, which is a fixing member for removably fixing the rear cover member 78 to the cover side plate 72, is inserted and fixed into the opposing hole 102 of the rear cover member 78 and one selected adjustment hole 101 that opposes it. Note that 104 in the figure is a rotation prevention member fixed to the side plate portion 86 of the rear cover member 78, and the rotation of the bolt 103 is restricted by this rotation prevention member 104.

[0054] Next, the operation etc. of the lawn mower 1 will be described.

[0055] When performing a lawn mowing operation using the lawn mower 1, the operator sets the rear cover member 78 at the rear of the cover body 71 to a state suitable for the desired workability.

[0056] Then, by the forward travel of the tractor, the lawn mower 1 mounted on the rear part of the tractor is moved forward.

[0057] Then, the working body 51 of the working part 6 of the grass mowing machine 1 performs grass mowing work while rotating in the up-cut direction based on the power from the tractor side.

[0058] At this time, the grass W growing on the working surface is mainly lifted upward by the grass cutting claws 64 of the working body 51 rotating in the up-cut direction and sent to the rear side while being cut. However, a part of the grass W is cut when it abuts against the corner part 93 of the cutting member 91 as shown in FIG. 4. Then, the cut grass (mowed grass, etc.) W is discharged to the rear side through the space part 70 and the like between the cover body 71 and the rotation locus 65 of the working body 51.

[0059] And according to such a grass mowing machine 1, a working body 51 that performs grass mowing work while rotating in the up-cut direction based on the power from the tractor side, a cover body 71 that covers the upper side of the working body 51, and a space part 70 that is located between the cover body 71 and the rotation locus 65 of the working body 51 and gradually becomes larger in the up-cut direction are provided. Therefore, it is possible to prevent (suppress) the cut grass W cut by the working body 51 from being clogged in the cover body 71. Thus, the comminution property and discharge property of the working part 6 are improved, and the grass mowing work can be performed efficiently.

[0060] In addition, since the cover body 71 has a cutting member 79 formed with a corner part 93 for cutting the grass W at the front end side, the grass W can also be cut by the corner part 93 of this cutting member 79, and the grass mowing work can be performed more efficiently.

[0061] Moreover, since the corner part 93 of the cutting member 79 is formed in a sharp shape (for example, a right-angled shape) instead of an arc shape, the grass W can be appropriately cut at this corner part 93.

[0062] Note that the cover body 71 of the grass mowing machine 1 is not limited to the above-described one, and may be, for example, those according to other embodiments shown in FIGS. 8 and 9.

[0063] Unlike the above-described one, the cover body 71 of the grass cutting machine 1 according to this other embodiment includes a cover main body member 106 having a substantially semi-circular plate shape convex upward, and a cutting member fixedly attached to a cutting member attachment portion 110 at the front end of the cover main body member 106, the cutting member (a reinforcing member and a cutting member also serving as a reinforcement of the cover main body member) 107 for cutting grass W.

[0064] The cutting member 107 is, for example, a longitudinally extending bending member in the left-right direction having a V-shaped cross section, and includes a front first plate portion 111, a rear second plate portion 112, and a cutting corner portion 113 formed between the first plate portion 111 and the second plate portion 112 for cutting grass W. The second plate portion 112 is fixed to the cutting member attachment portion 110 on the front end side of the cover body 71.

[0065] Note that the angle θ formed by the first plate portion 111 and the second plate portion 112 is preferably, for example, 60° to 90°, and in the illustrated example, it is "θ = 60°" (see FIG. 9). Further, as shown in FIG. 9, the cutting corner portion 113 is not sharp, but is formed in an arc shape with a radius of 3 mm or less, that is, for example, an arc shape with a radius of 3 mm (R3).

[0066] And between the inner surface (the surface facing the working body) of the cover body 71 composed of such a cutting member 107 and the cover main body member 106 and the rotation locus 65 of the working body 51 rotatable in the up-cut direction, a space portion 70 that gradually increases in the up-cut direction is formed in the same manner as described above. Therefore, even with the configuration shown in FIGS. 8 and 9, the same operational effects as described above can be achieved, such as being able to perform the grass cutting operation efficiently.

[0067] In the example shown in FIG. 8, as an example of specific dimensions, for example, "A1 = 22 mm", "A2 = 28 mm", "A3 = 35 mm", "A4 = 42 mm", "A5 = 45 mm".

[0068] Also, in any of the above embodiments, although the configuration in which a cutting member (a reinforcing member and a cutting member) separate from the cover body member is fixed to the cutting member attachment portion of the cover body member by welding or the like has been described, for example, a configuration in which the cutting member is detachably attached to the cutting member attachment portion may be used.

[0069] Furthermore, for example, as shown in FIG. 10, a configuration in which a cutting member 121 made of a plate member that is longitudinally long in the left-right direction and flat is provided on the lower surface portion 75a of the cutting member attachment portion 75 so that its front-rear position can be adjusted may be used.

[0070] In this configuration, by adjusting the front-rear position of the cutting member 121 with respect to the cutting member attachment portion 75, it becomes possible to change the distance (spatial width) A1 between the rear end portion of the cutting member 121 and the rotation locus 65 of the working body 51. Then, for example, as shown in FIG. 10(b), by making the distance A1 smaller than the case shown in FIG. 10(a), it is possible to improve the cuttability by the cutting member 121.

[0071] The cutting member 121 shown in this FIG. 10 has a sharp corner portion 123 for cutting the grass W at the lower end of the rear end portion. A plurality of elongated holes 124 that are longitudinally long in the front-rear direction are formed in the cutting member 121 at intervals in the left-right direction. Then, the cutting member 121 is attached to the cutting member attachment portion 75 by a fixture (such as a bolt and a nut) 125, and the front-rear position of this cutting member 121 can be adjusted within the length dimension range of the elongated holes 124.

[0072] Although not shown in the figure, for example, a configuration in which the distance (spatial width) between the cutting member and the rotation locus of the working body can be changed by making the cutting member attachment portion adjustable in the front-rear position may be used.

[0073] Although some embodiments and modifications thereof of the present invention have been described, it is also possible to appropriately combine each embodiment and each modification without departing from the gist of the present invention.

Explanation of Reference Numerals

[0074] 1 Grass cutting working machine 51 Working body 65 Rotation locus 70 Space part 71 Cover body 75,110 Cutting member mounting part 78 Rear cover member 79,107,121 Cutting member 91,111 First plate part 92,112 Second plate part 93,113,123 Corner part W Grasses

Claims

1. A lawn mowing machine used by being connected to a traveling vehicle, a working body that performs lawn mowing while rotating in an up-cut direction, a cover body that covers the upper side of the working body, a space portion formed between the rotation locus of the working body and the cover body and increasing in the up-cut direction characterized by comprising. A lawn mowing machine.

2. The cover body has a cutting member formed with a corner for cutting grass The lawn mowing machine according to claim 1, characterized in that.

3. The cover body has a cutting member attachment portion on the front end side, The cutting member is attached to the cutting member attachment portion The lawn mowing machine according to claim 2, characterized in that.

4. The corner of the cutting member is formed between a first plate portion and a second plate portion, The angle formed by the first plate portion and the second plate portion is 60° to 90° The lawn mowing machine according to claim 2 or 3, characterized in that.

5. The corner of the cutting member is formed in a sharp shape or an arc shape with a radius of 3 mm or less The lawn mowing machine according to claim 2 or 3, characterized in that.

6. The cover body has a rear cover member that can be rotationally adjusted in the vertical direction The lawn mowing machine according to any one of claims 1 to 3, characterized in that.

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