Agricultural work machine

Abstract

To provide an agricultural work machine excellent in workability.SOLUTION: An agricultural work machine includes a machine body, a work unit connected to the machine body so as to adjust an inclination with respect to the machine body, and an inclination adjustment mechanism including a first grip portion capable of switching between a restricted state in which the adjustment of the inclination is restricted and a restriction released state in which the restriction of the adjustment of the inclination is released. The first grip portion includes a fixed portion fixed to the work unit and a movable portion provided so as to be gripped together with the fixed portion which is movable relative to the fixed portion. The movable portion is movable relative to the fixed portion by being gripped together with the fixed portion by an operator, and is switched from the restricted state to the restriction released state by the movement of the movable portion relative to the fixed portion.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an agricultural machine. [Background technology]

[0002] Conventionally, mowing work has been carried out periodically using a mower to remove weeds and the like that have grown on the top surface or slopes of ridges. Patent Document 1 discloses a self-propelled mower that is remotely controlled via wireless communication and moves over the ridge to mow the top surface and slopes. The mower described in Patent Document 1 is equipped with a cutting blade unit that has a horizontal cutting blade and an inclined cutting blade at the front of the machine body, and while moving, it can use the horizontal cutting blade to remove weeds and the like that have grown on the top surface of the ridge, and the inclined cutting blade to remove weeds and the like that have grown on the slopes of the ridge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-176153 Summary of the Invention [Problem to be solved by the invention]

[0004] When mowing the slope of a ridge, it is necessary to adjust the inclination angle of the slope mowing unit of the mower depending on the slope angle of the slope. In the mower described in Patent Document 1, the angle of the inclined mowing blade is adjusted by inserting pins into holes in multiple arms connected between the inclined mowing blade and the machine body, but attaching and removing the pins is tedious, making the work difficult. There are also problems such as interruptions to work due to the pin being lost. Furthermore, when removing the pin, it is necessary to support the inclined mowing blade, which is freely rotatable, which means both hands are occupied, making the work difficult.

[0005] An embodiment of the present invention has been made in consideration of the above problems, and has an object to provide an agricultural work machine with good workability. [Means for solving the problem]

[0006] In one embodiment of the present invention, an agricultural work machine comprises a body, a working unit connected to the body so that its inclination relative to the body can be adjusted, and a tilt adjustment mechanism including a first gripping unit that can switch between a restricted state in which the adjustment of the inclination is restricted and an unrestricted state in which the restriction on the adjustment of the inclination is released, wherein the first gripping unit comprises a fixed part fixed to the working unit and a movable part that can be gripped together with the fixed part and is movable relative to the fixed part, wherein the movable part can be moved relative to the fixed part by being gripped together with the fixed part by an operator, and the state is switched from the restricted state to the unrestricted state by movement of the movable part relative to the fixed part.

[0007] The tilt adjustment mechanism may include a positioning member having a limiting portion, and a restricted portion that enters the limiting portion to limit the adjustment of the tilt.

[0008] The movable part may be connected to the restricted part, and movement of the movable part relative to the gripping part may cause the restricted part to move from a restricted position where the restricted part enters the restricted part to an unrestricted position where the restricted part retreats from the restricted part.

[0009] The tilt adjustment mechanism may include a biasing portion that biases the movable portion in a direction away from the fixed portion, and a stopper that, in the unrestricted state, restricts the movable portion from rotating in the direction away from the fixed portion.

[0010] The positioning member may be a plate-like member provided with a plurality of the limiting portions, and the restricted portion may be a rod-like member that can enter any one of the limiting portions.

[0011] The working unit may include a second gripping unit provided at a position opposite to the first gripping unit. [Effects of the Invention]

[0012] According to one embodiment of the present invention, it is possible to provide an agricultural work machine with good workability. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a top view showing the configuration of a grass mower according to an embodiment of the present invention; [Figure 2] 1 is a side view showing the configuration of a grass mower according to an embodiment of the present invention. [Figure 3] 1 is a rear view showing the configuration of a grass mower according to an embodiment of the present invention. FIG. [Figure 4] 1 is a perspective view showing the configuration of a slope mowing unit of a grass mower according to an embodiment of the present invention. [Figure 5] FIG. 2 is a side view showing the configuration of a slope reaping unit according to one embodiment of the present invention. [Figure 6] FIG. 2 is a side view showing the configuration of a slope reaping unit according to one embodiment of the present invention. [Figure 7] FIG. 2 is a side view showing the configuration of a slope reaping unit according to one embodiment of the present invention. [Figure 8] FIG. 2 is a rear view showing the configuration of a slope reaping unit according to one embodiment of the present invention. [Figure 9] FIG. 2 is a rear view showing the configuration of a slope reaping unit according to one embodiment of the present invention. [Figure 10] FIG. 2 is a rear view showing the configuration of a slope reaping unit according to one embodiment of the present invention. [Figure 11] FIG. 2 is a rear view showing the configuration of a slope reaping unit according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] A grass cutter, which is an example of an agricultural work machine according to the present invention, will be described below with reference to the drawings. However, the agricultural work machine according to the present invention can be embodied in many different forms, and should not be construed as being limited to the description of the example shown below. In the drawings referred to in this embodiment, identical parts or parts having similar functions are designated with the same reference numerals or with the same reference numerals followed by an alphabet, and repeated description thereof will be omitted. Furthermore, when identical or similar parts are provided on the left and right sides of the direction of travel, the reference numerals of the parts are followed by L (left-side member) or R (right-side member). When there is no particular distinction between left and right members, the parts may be described using only the reference numerals, omitting L and R.

[0015] In this specification, "up" refers to the direction vertically away from the grass when the mower is moving forward while mowing a ridge or other grass area, and "down" refers to the opposite direction from "up." For ease of explanation, "front" refers to the direction in which the top cutting unit is positioned relative to the traveling unit, and "rear" refers to the opposite direction from "front." Furthermore, "left" and "right" refer to the left and right in a rear view of the mower as seen from the rear of the mower.

[0016] Furthermore, when the center line of the mower in a plan view (a line parallel to the direction of travel and passing through the center of the mower) is used as a reference, the side closer to the center line is called the "inside" and the side farther from the center line is called the "outside."

[0017] In the present specification, ridges, flat land and other grasslands where grass is cut by a mower are collectively referred to as grasslands.

[0018] [1. First embodiment] [1-1. Configuration of the grass cutter 100] The mower 100 is a self-propelled mower that mows grass while traveling. Specifically, the mower 100 is remotely controlled by a remote controller, and is a mower that mows grass while self-propelled over grassland.

[0019] FIG. 1 is a top view showing the configuration of a mower 100 according to one embodiment of the present invention. FIG. 2 is a left side view showing the configuration of a mower 100 according to one embodiment of the present invention. Specifically, FIG. 2 shows a state in which, when the mower is traveling on a ridge, the slope mowing unit 80 (only the left slope mowing unit 80L is shown) described below is adjusted to a position parallel or approximately parallel to a horizontal plane 203 (see FIG. 3). FIG. 3 is a rear view showing the configuration of a mower 100 according to one embodiment of the present invention. Specifically, FIG. 3 shows a state in which, when the mower 100 is traveling on a ridge, the slope mowing unit 80 is adjusted to an oblique position in accordance with the inclination of the slope 202 of the ridge 200.

[0020] As shown in FIGS. 1 to 3, the mower 100 includes a machine body 10, a traveling unit 20, a mowing unit 120 including a top surface mowing unit 30 and a slope surface mowing unit 80, a position adjustment mechanism 90, an inclination adjustment mechanism 130, an engine 60, an alternator 70, a battery 40, and a tip-over prevention means 300. The drive of each unit is controlled by a control unit 50. The mower 100 is self-propelled by the traveling unit 20 and controls the drive of the mowing unit 120, so that it can mow the top surface 201 and the slope surface 202 of a ridge 200 in a single run, as shown in FIG. 3. Note that, to simplify the illustration, parts other than the slope surface mowing unit 80, the position adjustment mechanism 90, and the inclination adjustment mechanism 130 are omitted or simplified in FIG. 3. The slope surface mowing unit 80 may be referred to as the "working unit."

[0021] 1 and 2, the machine body 10 includes a machine body 14, which is a frame forming the skeleton of the mower 100, and a support case 15 attached to the machine body 14 and extending forward. The support case 15 may be supported so as to be rotatable in the vertical direction relative to the machine body 14. Mounting members 11 (see FIG. 2) for attaching the top surface mowing unit 30 are provided facing downward on the support case 15. In addition, a pair of left and right slope mowing units 80 are provided at the rear of the machine body 14. As will be described in detail later, the slope mowing units 80 are supported by a position adjustment mechanism 90 that adjusts the position of the slope mowing units 80 in the vertical and horizontal directions, and an inclination adjustment mechanism 130 that rotates the slope mowing units 80 around an axis (for example, a rotation axis 185L described later) that extends in the traveling direction of the machine body 10. In other words, the slope reaping unit 80 (working unit) is connected to the machine body 10 (machine body 14) so ​​that its inclination relative to the machine body 10 can be adjusted. The machine body 10 can be made of a metal material (e.g., steel, aluminum), fiber reinforced plastic (FRP) material, or the like, but is not limited to these examples.

[0022] The travel section 20 includes a pair of left and right travel sections 20L and 20R, and functions as travel means for the mower 100. When viewed from behind (see FIG. 3), the travel section 20L is the travel means on the left side when facing the direction of travel of the mower 100, and the travel section 20R is the travel means on the right side. Note that the structure of the travel section 20R is the same as that of the travel section 20L, so the following description will focus on the travel section 20L.

[0023] As shown in FIG. 2, the traveling unit 20L includes a crawler belt 21L, drive wheels 22L, driven wheels 23L, a crawler frame 24L, and a drive unit 54L. The crawler belt 21L is spanned between the drive wheels 22L and the driven wheels 23L and rotates in accordance with the rotation of the drive wheels 22L. The drive unit 54L is driven by power supplied from an alternator 70 or a battery 40. The drive wheels 22L rotate by power transmitted from the drive unit 54L. Power generated by the rotation of the drive wheels 22L is transmitted to the driven wheels 23L via the crawler belt 21L. The crawler frame 24L rotatably supports the drive wheels 22L and the driven wheels 23L. In this embodiment, the crawler belt 21L is made of an elastic member (specifically, rubber) and has a plurality of lugs (protrusions), and a motor is used as the drive unit 54L.

[0024] As described above, in FIG. 1 , the mowing unit 120 includes the top surface mowing unit 30 provided in front of the traveling unit 20 and the slope surface mowing unit 80 (specifically, a pair of left and right slope surface mowing units 80L and 80R) provided behind the traveling unit 20. As will be described in detail later, the top surface mowing unit 30 is provided in front of the machine body 10 and functions as a mowing unit that mows weeds and other grass that grow on the top surface (mowing work) when mowing ridges. The slope surface mowing unit 80 is provided behind the machine body 10 and functions as a mowing unit that mainly mows weeds and other grass that grow on slopes when mowing ridges. For example, when mowing the top surface of a ridge and the left and right slopes simultaneously, the top surface mowing unit 30 will be located between the left slope surface mowing unit 80L and the right slope surface mowing unit 80R in the left-right direction in a rear view. The positional relationship between the top surface reaping unit 30 and the slope surface reaping unit 80 is not limited to the example shown in FIGS. 1 to 3, and for example, the positions of the top surface reaping unit 30 and the slope surface reaping unit 80 may be reversed.

[0025] The work that can be performed by the slope mowing unit 80 is not limited to mowing on slopes, but it is also possible to perform mowing on grasslands other than slopes (for example, flat grasslands). For example, as shown in Figures 1 and 2, if the slope mowing unit 80 is adjusted to a position parallel or approximately parallel to the horizontal plane 203 (see Figure 3), it can perform mowing on a flat surface that is parallel or approximately parallel to the horizontal plane 203.

[0026] The control unit 50 is provided, for example, above the machine body 10, and has the function of controlling the traveling unit 20, the cutting unit 120, the engine 60, the alternator 70, or the battery 40. The control unit 50 has, for example, an electronic circuit board equipped with a calculation unit, memory, a communication circuit, etc. In this case, a control program for controlling each part of the mower 100 is stored in the memory, and the calculation unit reads the control program from the memory and controls each part, such as the traveling unit 20, based on the control program.

[0027] As shown in Figures 1 to 3, the engine 60 is provided above the machine body 10. The engine 60 functions as a power source for the drive unit 33 that drives the top surface reaping unit 30, and as a power source for the alternator 70. The power generated by the engine 60 is transmitted to the drive unit 33 and the alternator 70 via power transmission means (not shown) formed of a belt or the like.

[0028] The alternator 70 is provided below the support case 15. The alternator 70 generates electric power by receiving power from the engine 60. The alternator 70 supplies the generated electric power to the battery 40 and also functions as a power source for the drive unit 83 that drives the slope reaping unit 80 and the drive unit 54 (see FIG. 2) that drives the traveling unit 20.

[0029] In this embodiment, an example has been shown in which the engine 60 is used as the power source for driving the top surface reaping unit 30, but the present invention is not limited to this example. For example, an alternator 70 can also be used as the power source for driving the top surface reaping unit 30. In other words, the top surface reaping unit 30, the slope reaping unit 80, and the traveling unit 20 can all be driven by power supplied from the alternator 70 or the battery 40.

[0030] The alternator 70 of this embodiment is equipped with a power generation control circuit (not shown) for controlling power generation. The mower 100 has a sensor that detects the battery voltage of the battery 40, and the power generation control circuit monitors the results detected by the sensor, allowing the alternator 70 to control its power generation state itself. The power generation control circuit controls the alternator 70 so that if the battery voltage of the battery 40 falls below a predetermined value, the alternator 70 generates power and enters a power supply state, and if the battery voltage of the battery 40 exceeds the predetermined value, the alternator 70 enters a power supply stopped state.

[0031] The battery 40 is provided at a position behind the control unit 50. The battery 40 stores the electric power generated by the alternator 70. The battery 40 may function as a power source that supplies the stored electric power to the drive unit 83 that drives the slope reaping unit 80 and the drive unit 54 that drives the traveling unit 20.

[0032] Although not shown, the mower 100 may include a cover member that covers the battery 40, the control unit 50, and the engine 60 and serves to protect each part. The cover member may be configured to cover only a portion of the battery 40, the control unit 50, and the engine 60.

[0033] The tip-over prevention means 300L and 300R are arranged side by side on the left and right running sections 20L and 20R, respectively, and prevent the mower 100 from tipping over in the left or right direction during mowing work. The tip-over prevention means 300 includes a support frame 310, a main arm 320, and an auxiliary arm 330. The support frame 310 is attached to the side of the running section 20 by an attachment member 17 (see Figure 2; however, Figure 2 shows only attachment member 17L) that is connected to the machine body 14 and the crawler frame 24.

[0034] One end of the front side of the main arm 320 is rotatably connected to the support frame 310, and the main arm 320 is rotatably supported by the support frame 310. The auxiliary arm 330 is an extendable member that spans between the support frame 310 and the main arm 320 and is configured to be fixed at a predetermined length. The main arm 320 can be rotated by extending or contracting the auxiliary arm 330. Specifically, when the auxiliary arm 330 is extended, the main arm 320 rotates downward and extends outward, and when the auxiliary arm 330 is retracted, the main arm 320 rotates upward and is held by the machine body. When mowing, the auxiliary arm 330 is extended, the main arm 320 is rotated downward, and the auxiliary arm 330 is fixed at a predetermined length. By doing so, when the mower 100 tilts, the extending main arm 320 comes into contact with the field or grass and can support the mower 100. It is also possible to place a member that can ensure a large contact area at the part of the main arm 320 that comes into contact with the field. For example, if a plate-shaped member is attached to the rear end of the main arm 320, the plate-shaped member will function as a part that comes into contact with the field when the mower 100 tilts, making it possible to distribute the load (weight of the mower 100) on the main arm 320.

[0035] The configuration of the reaping unit 120 (specifically, the top surface reaping unit 30 and the slope surface reaping unit 80) will be described in detail below with reference to FIGS.

[0036] [1-2. Configuration of top surface reaping unit 30] The structure of the top surface reaping unit 30 will be described. As shown in FIG. 1, the top surface reaping unit 30 includes a casing 31, two blade units 32L and 32R arranged side by side, and drive units 33L and 33R corresponding to the blade units 32L and 32R, respectively. The drive units 33L and 33R are each connected to a mounting member 11. The casing 31 covers the top and sides of the blade unit 32 to prevent soil, pebbles, grass, and the like from scattering to the surrounding area. The casing 31 is sometimes referred to as a cover unit, and the side of the blade unit 32 not covered by the casing 31 faces the top surface 201 of the ridge 200. The structures of the blade unit 32R and drive unit 33R are the same as those of the blade unit 32L and drive unit 33L, respectively.

[0037] As shown in FIG. 2, the top surface cutting unit 30 is supported so as to be suspended from the support case 15 via the mounting member 11. The blade unit 32 is made up of multiple mowing blades. The blade unit 32 is connected to the rotating shaft of the drive unit 33, and rotation of the rotating shaft of the drive unit 33 causes the blade unit 32, which includes multiple mowing blades, to rotate. These rotating mowing blades perform the work of mowing the grass. The drive unit 33 uses the driving force of the engine 60 transmitted via power transmission means (not shown) including a belt (not shown) as the driving force (rotational power) for the blade unit 32.

[0038] In this embodiment, the two blade sections 32L and 32R are provided symmetrically or approximately symmetrically with respect to the center line 110 of the machine body 10, and are arranged with a phase shift so that the mowing blades do not interfere with each other when the machine is stationary. The power transmission means is designed to transmit the driving force of the engine 60, transmitted via a belt, evenly or approximately evenly to both drive sections 33L and 33R. Therefore, the multiple mowing blades of blade section 32L and the multiple mowing blades of blade section 32R rotate at the same timing and the same speed.

[0039] In this embodiment, an example has been shown in which the engine 60 is used as the power source for rotating the blade section 32 of the top surface cutting section 30. However, when the alternator 70 is used as the power source for rotating the blade section 32, a motor can be used as the drive section 33. In this case, the control section 50 may be used to independently control the drive sections 33L and 33R, and independently drive the blade sections 32L and 32R. Furthermore, in this case, the power for driving the motor can be supplied from the alternator 70 or the battery 40.

[0040] [1-3. Configuration of the slope reaping unit 80] The structure of the slope reaping unit 80 will now be described. The slope reaping unit 80 includes a pair of left and right slope reaping units 80L and 80R. As shown in FIGS. 1 and 2, the slope reaping units 80L and 80R include casings 81L and 81R, blade units 82L and 82R, drive units 83L and 83R corresponding to the blade units 82L and 82R, first gripping units 150L and 150R, and second gripping units 140L and 140R, respectively. The casing 81, like the casing 31 of the top surface reaping unit 30, is sometimes referred to as a cover unit. It covers the top and sides of the blade units 82 and prevents soil, pebbles, grass, and other debris from scattering into the surrounding area. The structure of the slope reaping unit 80R is the same as that of the slope reaping unit 80L.

[0041] As shown in FIG. 2, the blade unit 82 has a plurality of mowing blades. The blade unit 82 is connected to and rotates on the rotary shaft of the drive unit 83, which is driven by power from the alternator 70 or the battery 40. That is, the rotation of the rotary shaft of the drive unit 83 causes the blade unit 82, which includes a plurality of mowing blades, to rotate, and the blade unit 82 performs grass cutting work. A motor, for example, can be used as the drive unit 83. The drive units 83L and 83R can be driven independently. That is, the mower 100 can perform grass cutting work by independently controlling the slope cutting units 80L and 80R.

[0042] 1 and 3, the slope reaping units 80L and 80R are supported on the machine body 14 via position adjustment mechanisms 90L and 90R and inclination adjustment mechanisms 130L and 130R, respectively. Because the position adjustment mechanisms 90 are rotatably connected to the machine body 14, the slope reaping units 80 are also rotatable relative to the machine body 14.

[0043] The position adjustment mechanism 90 is a mechanism for moving the slope mowing unit 80 to follow the shape of the slope when the slope mowing unit 80 mows the slope. It adjusts the left-right position of the slope mowing unit 80 to match the width of the ridge (ridge width) and the up-down position of the slope mowing unit 80 to match the undulations of the slope. The position adjustment mechanism 90 includes a parallel link structure for translating the slope mowing unit 80 in the vertical direction relative to the machine body 14, and a parallel link structure for translating the slope mowing unit 80 in the horizontal direction. These two parallel link structures allow the slope mowing unit 80 to translate up, down, left, and right without changing its posture. In other words, when the position adjustment mechanism 90 operates in response to changes in the ridge width or the undulations of the slope, the two parallel link structures translate the slope mowing unit 80 in the vertical and horizontal directions, preventing changes in posture relative to the slope and allowing for efficient mowing.

[0044] The tilt adjustment mechanisms 130L and 130R are connected to the position adjustment mechanisms 90L and 90R and the slope reaping units 80L and 80R, respectively. The slope reaping unit 80 is connected to the machine body 10 so that its tilt with respect to the machine body 14 can be adjusted by operating the tilt adjustment mechanism 130. Specifically, as shown in FIG. 3, the tilt adjustment mechanism 130 is configured to adjust the angle (angle α2) between the mowing surface 204 of the slope reaping unit 80 and the underside of the machine body 14 (the same plane as the plane 206 shown in FIG. 3) in accordance with the inclination angle of the slope 202 of the ridge 200 (the same angle as the angle α1 between the horizontal plane 203 and the mowing surface 204). In the following description, the "underside of the machine body 14" is synonymous with the plane 206 shown in FIG. 3. The "cutting surface 204" is a surface (indicated by a dashed line in FIG. 3) that includes the path of the blade 82 (see FIG. 2) of the slope cutting unit 80 when cutting grass, and can also be said to be the cut surface of the grass during the mowing work. The configurations of the tilt adjustment mechanisms 130L and 130R will be explained in detail later.

[0045] 1 and 2, the slope mowing units 80L and 80R include mowing height adjustment units 400L and 400R, respectively. The mowing height adjustment unit 400L includes a roller support unit 420L that rotatably supports the roller 410L. Similarly, the mowing height adjustment unit 400R includes a roller support unit 420R that rotatably supports the roller 410R.

[0046] 1, the front end of the roller support part 420 is rotatably supported via a bracket (not shown) erected on the upper surface of the casing 81, and each extends rearward from near the rear end of the slope cutting part 80. An adjustment part (not shown) is also provided on the upper surface of the casing 81 for adjusting the rotational position of the roller support part 420 using a positioning pin.

[0047] The roller 410 extends laterally from the roller support part 420 and is rotatably connected to the roller support part 420. As shown in FIG. 2, the roller 410L is suspended from the roller support part 420L. The roller 410 is a rotating body having a truncated cone shape. The rotation axis of the truncated cone is inclined downward with respect to the roller support part 420L so that the bottom surface of the roller 410 is parallel or approximately parallel to the mowing surface 204 of the slope mowing unit 80. The bottom surface of the truncated cone shape of the roller 410 is closer to the roller support part 420 than the top surface. In other words, the diameter of the roller 410 gradually decreases as it moves away from the roller support part 420.

[0048] As described above, the slope mowing unit 80 is configured to move in accordance with the shape of the slope through the operation of the position adjustment mechanism 90. As shown in FIG. 3, the slope mowing unit 80 is configured so that the roller 410 comes into contact with the slope 202 of the ridge 200 and the distance from the mowing surface 204 to the slope 202 (corresponding to the mowing height) can be maintained at a predetermined distance H1. In other words, the slope mowing unit 80 can maintain a constant mowing height for grass growing on the slope 202 in accordance with the undulations of the slope 202 of the ridge 200. Furthermore, by inserting the aforementioned positioning pin while the roller support unit 420 is at a predetermined rotation angle, the position of the roller 410 relative to the slope mowing unit 80 can be adjusted. Therefore, the height of the mowing surface 204 relative to the slope 202 can be adjusted.

[0049] As described above, the mower 100 of this embodiment can translate the slope mowing unit 80 in the up, down, left, and right directions by operating the position adjustment mechanism 90, allowing mowing work to be performed without changing the posture of the slope mowing unit 80 in response to changes in ridge width and the undulations of the slope. Providing a cutting height adjustment unit 400 on the slope mowing unit 80 is extremely useful for effectively operating the position adjustment mechanism 90. The mower 100 can maintain a predetermined distance from the mowing surface 204 to the slope 202 using the cutting height adjustment unit 400, preventing the casing 81 of the slope mowing unit 80 from contacting the ridge 200 and enabling smooth translation of the slope mowing unit 80 by the position adjustment mechanism 90.

[0050] As described above, in this embodiment, a configuration in which the slope reaping unit 80 can be moved in the up, down, left, and right directions by the position adjustment mechanism 90 has been exemplified, but the present invention is not limited to this configuration. The position adjustment mechanism 90 may be omitted, and the slope reaping unit 80 may be connected to the machine body 10 via the tilt adjustment mechanism 130. In other words, the slope reaping unit 80 may not be movable in the up, down, left, and right directions, and only its tilt may be adjusted by the tilt adjustment mechanism 130. However, a configuration in which the position adjustment mechanism 90 can be moved only in the up, down, or left and right direction may also be employed.

[0051] [1-4. Configuration of tilt adjustment mechanism 130] The configuration of the inclination adjustment mechanism 130 will be described using Figures 4 to 7. Figure 4 is a perspective view showing the configuration of the slope mowing unit of a mower according to one embodiment of the present invention. Figures 5 to 7 are side views showing the configuration of the slope mowing unit according to one embodiment of the present invention. Figures 5 to 7A are views of the slope mowing unit 80L, position adjustment mechanism 90L, and inclination adjustment mechanism 130L, respectively, as seen from the left side. However, members such as the drive unit 83L, second gripping unit 140L, roller 410L, and roller support unit 420L shown in Figure 4 are omitted, and only a portion of the configuration of the slope mowing unit 80L related to the inclination adjustment mechanism 130L (for example, a fixed unit 151L, a movable unit 160L, a connecting unit 175L, and a reinforcing member 176L, which will be described later) is shown as a cross-sectional view. Figures 5 to 7B also show the positional relationship between the movable unit 160L and the restricted unit 170L in the states shown in Figures 5 to 7A, respectively.

[0052] As shown in FIG. 4, the position adjustment mechanism 90L is connected to the vicinity of the right end of the slope reaping part 80L via an inclination adjustment mechanism 130L.

[0053] The tilt adjustment mechanism 130L adjusts the tilt of the slope mowing unit 80 with respect to the machine body 10 by rotating the slope mowing unit 80L around an axis (a pivot axis 185L, described below) that extends in the direction of travel of the machine body 10 when moving forward. As will be described in detail below, the tilt adjustment mechanism 130L is a mechanism that can switch between a "restricted state" and a "restriction-released state." The restricted state is a state in which adjustment of the slope mowing unit 80 with respect to the machine body 10 is restricted. The restriction-released state is a state in which the restriction on the tilt adjustment is released. Specifically, in the restriction-released state, the tilt adjustment mechanism 130L can adjust the tilt of the slope mowing unit 80L with respect to the underside of the machine body 10 (e.g., the machine body main body 14). In the restriction-released state, the tilt adjustment mechanism 130L limits the rotation range of the slope mowing unit 80L to an adjusted predetermined rotation angle or a predetermined rotation angle range that includes the adjusted predetermined rotation angle.

[0054] 4 to 7, the tilt adjustment mechanism 130L includes a first gripping portion 150L, ​​a restricted portion 170L, a connecting portion 175L, and a tilt positioning member 180L. The first gripping portion 150L includes a fixed portion 151L fixed to the slope reaping portion 80L, and a movable portion 160L that is provided so as to be grippable together with the fixed portion 151L and is movable relative to the fixed portion 151L.

[0055] The fixing portion 151L includes a pair of leg-shaped members 152L provided on the upper surface of the casing 81L, a plate 153L fixed to the upper ends of the leg-shaped members 152L so as to span the pair of leg-shaped members 152L, and a rod-shaped member 154L fixed to the upper surface of the plate 153L and held by an operator.

[0056] The movable part 160L is a lever-like member rotatably supported by a rotation shaft 164L fixed between a pair of leg-like members 152L, and has a first arm part 161L and a second arm part 162L. The movable part 160L is configured in a substantially V-shape, and as shown in FIGS. 5 and 6A, is rotatable about the rotation shaft 164L provided at the bent part where the first arm part 161L and the second arm part 162L are connected. The movable part 160L, together with the rod-like member 154L of the fixed part 151L, is provided in a position where it can be grasped by an operator.

[0057] The first arm portion 161L is a portion that is operated (held) by an operator, and a bent portion 166L that can hook a hook 155L provided on a rod-shaped member 154L (described later) is provided near the rear end of the first arm portion 161L, i.e., the rotating end portion. The second arm portion 162L is a portion that is connected to a restricted portion 170L (described later), and is provided with an elongated hole 163L through which a protrusion 172L provided on a connecting portion 171L (described later) slides.

[0058] Further, a biasing portion 165L is provided between the movable portion 160L and the casing 81L. The biasing portion 165L biases the movable portion 160L in a direction away from the fixed portion 151L. In other words, the biasing portion 165L applies rotational force to the movable portion 160L in the R1 direction (downward). As will be described in detail later, when the biasing portion 165L biases the movable portion 160L, a restricted portion 170L (described later) receives a force in a direction to be inserted into a tilt positioning member 180L (described later), more specifically, in a direction to enter limiting portions 186L to 189L (described later) provided on the positioning member 180L (described later). In this embodiment, a spring (a coil spring in this embodiment) is used as the biasing portion 165L. However, the configuration of this embodiment is not limited to that of the present invention, and the biasing portion 165L may be a torsion coil spring as long as it can apply a force to the restricted portion 170L in the direction of insertion into the tilt positioning member 180L, more specifically, in the direction of entering limiting portions 186L to 189L provided on the positioning member 180L, which will be described later. Also, an elastic member other than a spring may be used, or a member without elasticity may be used.

[0059] 5 and 6A, when an operator grips the movable part 160L together with the fixed part 151L, the movable part 160L rotates around the rotation axis 164L and is movable relative to the fixed part 151L. Specifically, when the operator grips the movable part 160L together with the fixed part 151L, the movable part 160L rotates in the R2 direction (upward) so as to approach the fixed part 151L. On the other hand, when the operator releases the fixed part 151L and the movable part 160L from their gripped state, the biasing force of the biasing part 165L causes the movable part 160L to rotate in the R1 direction (downward) so as to move away from the fixed part 151L.

[0060] A hook 155L is rotatably connected near the rear end of the fixed part 151L. The hook 155L is configured in a ring shape. When the movable part 160L rotates in the R2 direction and approaches the fixed part 151L, the hook 155L is hooked onto the bent part 166L of the movable part 160L, thereby restricting the rotation of the movable part 160L in the R1 direction (the direction in which the movable part 160L moves away from the fixed part 151L).

[0061] The restricted portion 170L is a rod-shaped member arranged to pass through a through-hole 177L provided in the connecting portion 175L and a through-hole provided in the reinforcing member 176, which will be described later. In the present embodiment, a configuration in which a pin is used as the restricted portion 170L is exemplified. The restricted portion 170L is fixed to the connecting portion 171L. A convex portion 172L provided to slide inside an elongated hole 163L provided in the second arm portion 162L is fixed to the connecting portion 171L. With the above-described configuration, the connecting portion 171L and the convex portion 172L connect the restricted portion 170L and the movable portion 160L. Instead of a rod-shaped pin, a non-rod-shaped member may be used as the restricted portion 170L.

[0062] As described above, the convex portion 172L slides on the inner wall of the elongated hole 163L, and the restricted portion 170L is inserted through the through hole 177L provided in the connecting portion 175L (described later) and the through hole provided in the reinforcing member 176, thereby interlocking the rotation of the movable portion 160L with the linear movement (advancement / retraction) of the restricted portion 170L. In other words, the elongated hole 163L provided in the second arm portion 162L of the movable portion 160L and the convex portion 172L provided in the coupling portion 171L, as well as the through hole 177L provided in the connecting portion 175L and the through hole provided in the reinforcing member 176, convert the rotational movement of the movable portion 160L into the linear movement (advancement / retraction) of the restricted portion 170L. 5 and 6A, as the movable part 160L rotates in the R2 direction, the convex part 172L is pushed rearward while sliding against the side wall of the elongated hole 163L, so that the restricted part 170 moves rearward while sliding through a through hole 177L provided in a connecting part 175L and a through hole provided in a reinforcing member 176, which will be described later. Also, as the movable part 160L rotates in the R1 direction, the convex part 172L is pushed forward while sliding against the side wall of the elongated hole 163L, so that the restricted part 170 moves forward while sliding through a through hole 177L provided in a connecting part 175L and a through hole provided in a reinforcing member 176, which will be described later. Note that the configuration is not limited to one in which the restricted portion 170L moves in the front-rear direction, and may be one in which the restricted portion 170L moves in the up-down direction as the movable portion 160L rotates, or one in which the restricted portion 170L moves in the left-right direction as the movable portion 160L rotates. Furthermore, it is desirable that the shape of the restricted portion 170L corresponds to the direction of movement of the restricted portion 170L. Furthermore, the restricted portion 170L may be configured to tilt and clamp the positioning member 180L as the movable portion 160L rotates.

[0063] The connecting portion 175L is fixed to the upper surface of the casing 81. The connecting portion 175L has a generally U-shaped configuration in a side view. A reinforcing member 176L is provided on the side wall on the rear end side of the connecting portion 175L. A through hole 177L (see FIG. 6) through which the restricted portion 170L is inserted is provided on the side wall on the rear end side of the connecting portion 175L, and a through hole through which the restricted portion 170L is inserted is also provided on the reinforcing member 176L. The reinforcing member 176L is fixed to the side wall on the rear end side of the connecting portion 175L so that the through hole provided in the reinforcing member 176L communicates with the through hole 177L provided in the side wall on the rear end side of the connecting portion 175L. In addition, a rotation shaft 185L fixed to these side walls is provided between the side wall on the front end side and the side wall on the rear end side of the connecting portion 175L.

[0064] The tilt positioning member 180L is configured in a substantially inverted U-shape, and its upper surface is fixed to the lower surface of the fixing portion 901L on the rear end side of the position adjustment mechanism 90L. The tilt positioning member 180L is arranged to be fitted inside the connecting portion 175L. Through holes are provided in the side walls on the front and rear end sides of the tilt positioning member 180L, and the rotation shaft 185L is inserted through the through holes. As described above, the connecting portion 175L and the tilt positioning member 180L are rotatably connected and supported by the rotation shaft 185L. The detailed configuration of the tilt positioning member 180L will be described later, but the tilt positioning member 180L is provided with a plurality of limiting portions 186L to 189L into which the restricted portion 170L can enter.

[0065] A detector is provided adjacent to the tilt adjustment mechanism 130L to detect when the tilt adjustment mechanism 130L is in the unlocked state. The detector includes a movable contact 190L, a fixed contact 191L, and an interlocking portion 195L (see FIG. 4). The interlocking portion 195L moves in the front-to-rear direction in conjunction with the restricted portion 170L. That is, when the movable portion 160L rotates in the R2 direction, the interlocking portion 195L moves rearward together with the restricted portion 170L. When the interlocking portion 195L moves rearward, it comes into contact with the movable contact 190L. Further rearward movement of the interlocking portion 195L moves the movable contact 190L rearward until it reaches the fixed contact 191L. When the control unit 50 detects that the movable contact 190L and the fixed contact 191L ​​have come into contact, it stops driving the drive unit 83L and stops the rotation of the blade portion 82. In other words, the movable contact 190L and the fixed contact 191L ​​function as a switch to ensure the safety of the worker by detecting that the tilt adjustment mechanism 130L has entered the restricted state when the worker grasps the movable part 160L together with the fixed part 151L.

[0066] As shown in Fig. 5A, when the restricted portion 170L moves forward and is inserted into (enters) one of the limiting portions 186L to 189L of the tilt positioning member 180L (described later) and reaches a limiting position, adjustment of the tilt of the slope mowing unit 80L is limited. This state is the "limited state" described above. Fig. 5A shows the state in which the restricted portion 170L has entered the limiting portion 186L (described later).

[0067] FIG. 6 shows a state in which the operator grips the movable part 160L together with the fixed part 151L from the state shown in FIG. 5, causing the movable part 160L to rotate in the R2 direction and come into contact with the fixed part 151L. As the movable part 160L rotates in the R2 direction, the protrusion 172L slides against the side wall of the elongated hole 163L and is pushed rearward, causing the restricted part 170L to move rearward. As a result, as shown in FIG. 6A, the restricted part 170L is positioned in a non-restricted position (described later) where it has withdrawn from any of the restricting parts 186L to 189L (described later) of the tilt positioning member 180L. This releases the restriction on the rotation of the slope reaping part 80L. As a result, the slope reaping part 80L can be freely rotated by the tilt adjustment mechanism 130L, making it possible to adjust the tilt of the slope reaping part 80L.

[0068] 7 shows a state in which, in the state shown in FIG. 6 (a state in which the worker grips movable part 160L together with fixed part 151L), the worker operates hook 155L to hook hook 155L onto movable part 160L, and then releases the grip of movable part 160L (a state in which the worker releases the grip of movable part 160L). Note that, when hook 155L is hooked onto movable part 160L and then the grip of movable part 160L is released, the biasing force of biasing part 165L causes movable part 160L to rotate by a predetermined angle in the R1 direction from the state shown in FIG. 6, but hook 155L restricts the rotation of movable part 160L in the R1 direction from the state shown in FIG. 7. Hook 155L is sometimes referred to as a "stopper." As shown in Fig. 7, the restricted portion 170L is in the non-restricted position where it has withdrawn from (retracted from) any of the limiting portions 186L to 189L (described later) of the tilt positioning member 180L, and the forward movement of the restricted portion 170L is restricted by the stopper. Therefore, even when the operator is not gripping the fixed portion 151L and the movable portion 160L, the restriction on the adjustment of the tilt of the slope reaping portion 80L by the tilt adjustment mechanism 130L is released. The states shown in Figs. 6 and 7 are both states in which the restriction on the adjustment of the tilt of the slope reaping portion 80L is released, and therefore correspond to the "restriction-released state" described above.

[0069] In the state shown in Fig. 7, an operator grips movable portion 160L together with fixed portion 151L, rotates movable portion 160L in the R2 direction, releases hook 155L from the bent portion 166L of movable portion 160L, and releases the grip of movable portion 160L, causing movable portion 160L to rotate in the R1 direction due to the biasing force of biasing portion 165L. As movable portion 160L rotates in the R1 direction, convex portion 172L slides against the side wall of elongated hole 163L and is pushed forward, causing restricted portion 170L to move forward. As a result, the state shown in Fig. 5 is restored.

[0070] As described above, the first gripping portion 150L switches between the restricted state and the unrestricted state. Specifically, when the movable portion 160L rotates in the R2 direction, the restricted portion 170L moves linearly rearward and is positioned at a non-restricted position where it is removed (retreated) from any of the restricting portions 186L to 189L described below, thereby switching from the "restricted state" to the "unrestricted state." On the other hand, when the movable portion 160L rotates in the R1 direction, the restricted portion 170L moves linearly forward and is positioned at a restricted position where it enters any of the restricting portions 186L to 189L described below, thereby switching from the "unrestricted state" to the "restricted state."

[0071] 7, the movable part 160L is biased in the R1 direction by the biasing part 165L, and therefore the hook 155L is pulled in the R1 direction by the movable part 160L. Therefore, even if vibration is applied to the slope mowing part 80L, it is possible to prevent the hook 155L from detaching from the bent part 166L of the movable part 160L.

[0072] In the present embodiment, a configuration in which the movable part 160L is connected to the fixed part 151L has been exemplified, but the present invention is not limited to this configuration. As long as the movable part 160L can be held together with the fixed part 151L and the movable part 160L is movable relative to the fixed part 151L, a configuration other than the above may be used. Furthermore, in the present embodiment, a configuration in which the movable part 160L is rotatably connected to the fixed part 151L has been exemplified, but the present invention is not limited to this configuration. For example, the movable part 160L may be connected to the fixed part 151L so as to be movable in parallel with the fixed part 151L.

[0073] [1-5. Configuration and Function of Tilt Positioning Member 180L] The configuration and function of the tilt positioning member 180L will be described using Figures 8 to 11. Figures 8 to 11 are rear views showing the configuration of the slope reaping unit 80L according to one embodiment of the present invention. Figures 8 to 11(A) are rear views of the slope reaping unit 80L, position adjustment mechanism 90L, and tilt adjustment mechanism 130L, respectively. For ease of explanation, members such as the fixed unit 151L and the movable unit 160L are omitted, and the restricted unit 170L is shown separately. In Figures 8 to 11, the slope reaping unit 80L rotates around a rotation shaft 185L. Similarly to the slope reaping unit 80L, the restricted unit 170L also rotates around the rotation shaft 185L. Furthermore, Figures 8 to 11(B) show the positional relationship between the tilt positioning member 180L and the restricted unit 170L for the states shown in Figures 8 to 11(A), respectively.

[0074] As described above, the tilt positioning member 180L is configured in a generally inverted U-shape, and the rear wall of the tilt positioning member 180L is flat, as shown in Figures 8 to 11(B). The tilt positioning member 180L is provided with a plurality of limiting portions 186L to 189L into which the restricted portion 170L can enter. The limiting portions 186L to 189L each limit the range of movement of the restricted portion 170L relative to the tilt positioning member 180L, i.e., the range of rotation of the slope cutting part 80L about the rotation axis 185L relative to the tilt positioning member 180L.

[0075] In this embodiment, the limiting portions 186L-189L are each formed by a recess provided on the outer periphery of the tilt positioning member 180L. The movable range of the restricted portion 170L relative to the tilt positioning member 180L, i.e., the rotation range of the slope mowing portion 80L around the rotation axis 185L relative to the tilt positioning member, is limited by the restricted portion 170L contacting the side walls of the limiting portions 186L-189L (recesses). Of these side walls, those marked with reference numerals in FIGS. 8-11B are referred to as engaging portions 181L-184L, 182'L, and 183'L. When the restricted portion 170L engages with one of these limiting portions 186L-189L (more specifically, the engaging portions 181L-184L, 182'L, and 183'L), the rotation of the slope mowing portion 80L by the tilt adjustment mechanism 130L is limited.

[0076] Therefore, by retracting the restricted portion 170L from any of the limiting portions 186L to 189L (to the non-restricted position) and adjusting the inclination of the slope mowing portion 80L, the restricted portion 170L can be moved into any of the limiting portions 186L to 189L (to the restricted position), thereby restricting the rotation range of the slope mowing portion 80L to the adjusted predetermined rotation angle or a predetermined rotation angle range including the adjusted predetermined rotation angle. The "restricted state" in which the restricted portion 170L is positioned at the restricted position where it has entered the limiting portions 186L to 189L of the inclination adjustment member 180L as shown in FIG. 5 is a state in which the restricted portion 170L can engage with any of the engaging portions 181L to 184L, 182'L, and 183'L.

[0077] 5 is a state in which the restricted portion 170L has entered the limiting portion 186L of the inclination adjustment member 180L, and therefore the restricted portion 170L can engage with the engaging portion 181L. On the other hand, in the "restriction release state" shown in FIGS. 6 and 7, in which the restricted portion 170L is positioned at a non-restricted position retreated from the limiting portions 186L to 189L of the inclination adjustment member 180L, the restricted portion 170L cannot engage with any of the limiting portions 186L to 189L (more specifically, the engaging portions 181L to 184L, 182'L, 183'L). Note that the switching operation between the "restriction state" and the "restriction release state" is performed by rotating the movable portion 160L as described above.

[0078] In this embodiment, the tilt positioning member 180L is provided with a plurality of limiting portions 186L to 189L (recesses), and the side walls of each recess function as engaging portions (engaging portions 181L to 184L, 182'L, 183'L). The rotation of the slope mowing part 80L by the tilt adjustment mechanism 130L is restricted by the restricted portion 170L coming into contact with (engaging with) any of the engaging portions 181L to 184L, 182'L, 183'L. In this state (restricted state in which the restricted portion 170L has entered any of the limiting portions 186L to 189L), the restricted portion 170L can engage with the engaging portions 181L to 184L, 182'L, 183'L, and therefore this position of the restricted portion 170L in the front-to-rear direction may be referred to as the "restricted position."

[0079] On the other hand, when the restricted portion 170L is removed (retracted) from the tilt positioning member 180L, the restricted portion 170L cannot engage with the engaging portions 181L to 184L, 182'L, and 183'L, and therefore the slope mowing portion 80L can rotate freely. The position of the restricted portion 170L in the front-to-rear direction in this state (a restricted release state in which the restricted portion 170L has retracted from all of the restricting portions 186 to 189L) may be referred to as the "unrestricted position."

[0080] The inclination of the engagement portions 182'L, 183'L is gentler than the inclination of the engagement portions 182L, 183L. That is, the angle of the side walls of the recesses (limiting portions 187L, 188L) of the engagement portions 182'L, 183'L relative to the arc centered on the rotation axis 185L is smaller than the angle of the corresponding side walls of the engagement portions 182L, 183L.

[0081] The engaging portion is not limited to the side wall of the recess. For example, a configuration in which protrusions functioning as engaging portions are formed on the flat surface of a plate-like member without a recess may be used instead of the tilt positioning member 180L. In this configuration, the space between the protrusions corresponds to the limiting portion. Furthermore, in this embodiment, the tilt positioning member 180L may be any member provided with limiting portions having something equivalent to the engaging portion, and the portion where the limiting portion is provided does not have to be flat. Furthermore, in this embodiment, the rod-shaped restricted portion 170L that moves in the front-rear direction is exemplified as a member that engages with the engaging portions 181L to 184L, 182'L, and 183'L of the tilt positioning member 180L, but this configuration is not limiting.

[0082] FIG. 8 shows a state in which the mowing surface 204L is horizontal. This state of the slope mowing unit 80L is sometimes referred to as the "horizontal state." In this state, the restricted portion 170L and the slope mowing unit 80L are positioned as shown by the solid lines. As shown in FIG. 8, the restricted portion 170L engages with the engaging portion 181L, restricting the rotation of the slope mowing unit 80L in the R3 direction (rotation of the slope mowing unit 80L downward). On the other hand, in the state shown in FIG. 8, there is no engaging portion in the R4 direction of the restricted portion 170L, so the restricted portion 170L can rotate in the R4 direction (to the position shown by the two-dot chain line) (rotation of the slope mowing unit 80L upward). Accordingly, the slope mowing unit 80L can also change from the horizontal state shown by the solid line to the inclined state shown by the two-dot chain line. For example, if there is an obstacle such as a stone in the grass, or if there is a bump in the grass, the slope cutting unit 80L can be rotated in the R4 direction to allow the slope cutting unit 80L to follow the shape of the obstacle or the grass.

[0083] FIG. 9 shows a state in which the cutting surface 204L is inclined at an angle θ1 with respect to the horizontal plane. In this state, the restricted portion 170L and the slope mowing portion 80L are positioned as shown by the solid lines. As shown in FIG. 9, the restricted portion 170L engages with the engaging portion 182L, restricting the rotation of the slope mowing portion 80L in the R3 direction. The restricted portion 170L engages with the engaging portion 182′L, restricting the rotation of the slope mowing portion 80L in the R4 direction. In the state shown in FIG. 9, the engaging portion 182′L is provided in the R4 direction of the restricted portion 170L, so the restricted portion 170L can rotate between the engaging portion 182′L (position indicated by the two-dot chain line) and the engaging portion 182L (position indicated by the solid line). In other words, the slope mowing portion 80L can change its inclination from the inclined state indicated by the solid line to the inclined state indicated by the two-dot chain line without being fixed at a constant inclination angle θ1. For example, the angle θ1 is about 30°.

[0084] FIG. 10 shows a state in which the cutting surface 204L is inclined at an angle θ2 with respect to the horizontal plane. In this state, the restricted portion 170L and the slope mowing portion 80L are positioned as shown by the solid lines. As shown in FIG. 10, the restricted portion 170L engages with the engaging portion 183L, restricting the rotation of the slope mowing portion 80L in the R3 direction. The restricted portion 170L engages with the engaging portion 183′L, restricting the rotation of the slope mowing portion 80L in the R4 direction. In the state shown in FIG. 10, the engaging portion 183′L is provided in the R4 direction of the restricted portion 170L, so the restricted portion 170L can rotate between the engaging portion 183′L (position indicated by the two-dot chain line) and the engaging portion 183L (position indicated by the solid line). In other words, the slope mowing portion 80L can change from the inclined state indicated by the solid line to the inclined state indicated by the two-dot chain line without being fixed at a constant inclination angle θ2. For example, the angle θ2 is about 60°.

[0085] FIG. 11 shows a state in which the mowing surface 204L is vertical. In the state shown in FIG. 11, the slope mowing unit 80L is rotated upward to store the slope mowing unit 80L. This state of the slope mowing unit 80L is sometimes referred to as the "stored state." As shown in FIG. 11, the restricted portion 170L engages with the engaging portion 184L, restricting rotation of the slope mowing unit 80L in the R3 and R4 directions around the rotation shaft 185L, and maintaining the stored state. In other words, in the stored state, the slope mowing unit 80L hardly rotates around the rotation shaft 185L due to the tilt adjustment mechanism 130L.

[0086] The first gripping unit 150L is provided near the right end of the slope mowing unit 80L, while the second gripping unit 140L is provided near the left end thereof. In other words, the second gripping unit 140L and the first gripping unit 150L are provided in positions facing each other near both left and right ends of the slope mowing unit 80L, and the drive unit 83L is provided between the second gripping unit 140L and the first gripping unit 150L. In a configuration in which the slope mowing unit 80L moves up and down relative to the machine body 10, when adjusting the tilt of the slope mowing unit 80L using the tilt adjustment mechanism 130L, the tilt may be adjusted while restricting the up and down movement of the slope mowing unit 80L. In this case, with the configuration according to this embodiment, the operator grasps fixed part 151L and movable part 160L, which are provided near the rotation center of slope surface mowing part 80L about rotation axis 185L, and rotates movable part 160L. This intuitive method allows the operator to retract restricted part 170L, which is in the restricted position, from limiting parts 186L to 189L of tilt adjustment member 180L, and release the restriction on rotation of slope surface mowing part 80L about rotation axis 185L while restricting the up and down movement of first gripping part 150L (fixed part 151L and movable part 160L in a gripped state). This leverage action allows the operator to move restricted part 170L from the restricted position to the unrestricted position with a light force. Furthermore, in this state, the operator can adjust the inclination of the slope reaping unit 80L by gripping the second gripping unit 140L and moving the gripping hand up and down to rotate the slope reaping unit 80L about the rotation axis 185L. That is, the operator can use one hand to release the restriction on the rotation of the slope reaping unit 80L about the rotation axis 185L and to restrict the up and down movement of the slope reaping unit 80L around the rotation axis 185L, and can use the other hand to adjust the inclination of the slope reaping unit 80L. Therefore, the workability of adjusting the inclination of the slope reaping unit 80L can be improved. Furthermore, the operator can also move the slope reaping unit 80L up and down while holding the first gripping unit 150L (or the rod-shaped member 154L) and the second gripping unit 140L.

[0087] In the above embodiment, a configuration in which the slope mowing unit 80L, which is the working unit, is provided on the self-propelled mower 100 has been exemplified, but the present invention is not limited to this configuration. For example, the above configuration may be applied to a working machine that is detachable from a traveling machine body such as a tractor.

[0088] Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above-described embodiments and can be modified as appropriate without departing from the spirit of the present invention. For example, agricultural work machines in which a person skilled in the art appropriately adds, deletes, or modifies components based on the present embodiments are also included in the scope of the present invention as long as they incorporate the gist of the present invention. Furthermore, the above-described embodiments can be combined as appropriate as long as there are no mutual contradictions, and technical matters common to the embodiments are included in the respective embodiments even if not explicitly stated.

[0089] Furthermore, even if there are other effects and advantages different from those brought about by the aspects of each of the above-mentioned embodiments, if they are clear from the description in this specification or can be easily predicted by a person skilled in the art, they are naturally understood to be brought about by the present invention. [Explanation of symbols]

[0090] 10: Machine body, 11: Mounting member, 14: Machine body, 15: Support case, 17: Mounting member, 20: Traveling unit, 21L: Crawler belt, 22L: Drive wheel, 23L: Driven wheel, 24: Crawler frame, 30: Top surface mowing unit, 31: Casing, 32: Blade unit, 33: Drive unit, 40: Battery, 50: Control unit, 54: Drive unit, 60: Engine, 70: Alternator, 80: Slope mowing unit, 81: Casing, 82: Blade unit, 83: Drive unit, 90: Position adjustment mechanism, 100: Grass cutter, 110: Center line, 120: Mowing unit, 130: Tilt adjustment mechanism, 140L, 140R: Second gripping unit, 150L: First gripping unit, 151L: Fixed portion, 152L: Leg-like member, 153L: Plate, 154L: Rod-like member, 155L: Hook, 160L: Movable portion, 161L: First arm portion, 162L: Second arm portion, 163L: Elongated hole, 164L: Rotating shaft, 165L: Urging portion, 166L: Bending portion, 170L: Restricted portion, 171L: Connecting portion, 172L: Convex portion, 175L: Connection portion, 180L: Tilt positioning member, 181L, 182L, 183L, 184L, 182'L, 183'L: Engaging portion, 185L: Rotating shaft, 186L, 187L, 188L, 189L: Limiting portion, 190L: Movable contact, 191L: fixed contact point, 195L: interlocking part, 200: ridge, 201: top surface, 202: slope, 203: horizontal surface, 204: mowing surface, 206: flat surface, 300: anti-tipping means, 310: support frame, 320: main arm, 330: auxiliary arm, 400: mowing height adjustment part, 410: roller, 420: roller support part

Claims

1. The aircraft and a working unit connected to the machine body so as to be adjustable in inclination relative to the machine body; a tilt adjustment mechanism including a first grip portion that can switch between a restricted state in which the tilt adjustment is restricted and a restricted release state in which the restriction on the tilt adjustment is released, The first gripping portion is a fixed portion fixed to the working portion; a movable part that is provided so as to be grippable together with the fixed part and is movable relative to the fixed part, the movable part is movable relative to the fixed part by being gripped by an operator together with the fixed part, The agricultural work machine switches from the restricted state to the released state by movement of the movable part relative to the fixed part.

2. The tilt adjustment mechanism includes: a positioning member having a limiting portion; The agricultural work machine according to claim 1 , further comprising: a restricted portion that restricts adjustment of the inclination by entering the restricting portion.

3. the movable portion is connected to the restricted portion, The agricultural work machine of claim 2, wherein movement of the movable part relative to the gripping part causes the restricted part to move from a restricted position where the restricted part enters the restricting part to an unrestricted position where the restricted part retreats from the restricting part.

4. The tilt adjustment mechanism includes: a biasing portion that biases the movable portion in a direction in which the movable portion moves away from the fixed portion; The agricultural work machine according to claim 1 , further comprising: a stopper that, in the restriction-released state, restricts the movable part from rotating in a direction away from the fixed part relative to the movable part.

5. the positioning member is a plate-like member provided with a plurality of the limiting portions, The agricultural work machine according to claim 2 or 3, wherein the restricted portion is a rod-shaped member that can enter any one of the restricting portions.

6. The agricultural work machine according to claim 1 , wherein the working unit includes a second gripping unit provided at a position opposite to the first gripping unit.

Images