Agricultural implement

Abstract

To provide an agricultural implement that allows an amount of tilt movement of an agricultural implement to be grasped easily.SOLUTION: An agricultural implement having a mounted part that is mounted on a travelling vehicle body and a work part connected to the mounted part includes a tilt mechanism part that can tilt-move the work part around a turning shaft parallel to the advancing direction of the travelling vehicle body. The tilt mechanism part is provided with detection means for detecting an amount of tilt movement of the work part.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an agricultural working machine in which a working part can be tilted (tilted and moved) up and down around a rotation axis parallel to the traveling direction with respect to a mounting part.

Background Art

[0002] Conventionally, among agricultural working machines connected to the rear of a traveling vehicle body such as a tractor, those that tilt and move the working part to an angle along an inclined working surface are known. (Patent Documents 1 to 4)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] In conventional agricultural working machines, the amount of tilt movement was grasped by the operator in the driver's seat of the traveling vehicle body looking back and visually recognizing it. However, since there was no indicator showing the amount of movement, it was difficult to accurately grasp the amount of movement, and it depended on the subjectivity of the operator.

[0005] Therefore, an object of the present invention is to solve the above problems and provide an agricultural working machine that can easily grasp the amount of tilt movement of the agricultural working machine.

Means for Solving the Problems

[0006] In order to solve such problems, the present invention has the following configuration. An agricultural work machine having a mounting portion mounted on a traveling vehicle body and a working portion connected to the mounting portion, comprising a tilt mechanism portion capable of tilting the working portion around a rotation axis parallel to the traveling direction of the traveling vehicle body, wherein the tilt mechanism portion is provided with detection means for detecting the tilt movement amount of the working portion. An agricultural work machine characterized by this.

Effect of the Invention

[0007] By detecting the tilt movement amount by the detection means, it is possible to provide an agricultural work machine that can be easily grasped without the operator looking back.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

[0009] [Embodiment 1] Hereinafter, the lawn mower 1 of Embodiment 1 according to the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings indicate parts having the same function, and redundant descriptions in each drawing are omitted as appropriate. For convenience of explanation, terms indicating directions such as upward, downward, forward, backward, rightward, and leftward are used. However, the direction in which gravity acts is downward, and the opposite is upward. Also, the direction in which the traveling vehicle body 2 travels is forward, and the opposite is backward. Further, toward the front, the right side is the rightward, and the left side is the leftward.

[0010] [Overall Structure] FIG. 1 is a view showing the stored state and horizontal state of the lawn mower 1 of Embodiment 1 of the present invention, and FIG. 2 is a view showing the maximum offset state and horizontal state of the lawn mower 1 of Embodiment 1 of the present invention. In both figures, the upper left figure is a plan view, the lower left figure is a front view (viewed from the rear), the upper right figure is a perspective view viewed from the upper right rear, and the lower right figure is a right side view (viewed from the right). FIG. 3 is a view showing the maximum offset state and horizontal state of the lawn mower 1 of Embodiment 1 of the present invention. The upper figure is a perspective view viewed from the upper right front, the middle figure is a rear view (viewed from the front), and the lower figure is a perspective view viewed from the upper left front. FIG. 4 is a bottom view of the lawn mower 1 according to Embodiment 1 of the invention, where (a) shows the stored state and the horizontal state, and (b) shows the maximum offset state and the horizontal state. The lawn mower 1 in this Embodiment 1 includes a mounting portion 11, an offset mechanism portion 12, a power transmission portion 13, a working portion 14, and a tilt mechanism portion 15. The lawn mower 1 is connected to a traveling vehicle body 2 such as a tractor (see FIG. 9) by the mounting portion 11. The mounting portion 11 and the working portion 14 are connected via the offset mechanism portion 12 and the power transmission portion 13. Accordingly, as the traveling vehicle body 2 travels, the lawn mower 1 moves forward, and the lawn mowing operation is performed by the working portion 14.

[0011] As will be described later, the working portion 14 can be moved by the operation of the offset mechanism portion 12 from the position shown in FIG. 1 to a position offset to the right side shown in FIG. 2. The position shown in FIG. 1 is a storage position where the working portion 14 is located at the rear position of the traveling vehicle body 2, and the state where the working portion 14 is in the storage position is referred to as the storage state. The position shown in FIG. 2 is the maximum offset position where the working portion 14 is offset to the outermost right side in the direction orthogonal to the traveling direction of the traveling vehicle body 2 with respect to the traveling vehicle body 2, and the state where the working portion 14 is in the maximum offset position is referred to as the maximum offset state.

[0012] The lawn mower 1 of this Embodiment 1 can perform the lawn mowing operation regardless of the position of the working portion 14 between the storage position and the maximum offset position. Also, it can be arbitrarily set within what range between the storage state as shown in FIG. 1 and the maximum offset state as shown in FIG. 2 the lawn mowing operation can be performed. For example, the lawn mowing operation may not be possible in the storage state, or the lawn mowing operation may be possible only at specific locations between the storage state and the maximum offset state, etc., and the lawn mowing operation may be performed only within a specific range or at a specific position.

[0013] [Mounting Portion] The mounting portion 11 is connected to a three-point link mechanism (not shown) provided between two rear tires 21 (see FIG. 9) of the traveling vehicle body 2. The three-point link mechanism is generally composed of a top link, a lift rod, a lower link, and the like. Since the three-point link mechanism is a known mechanism, a detailed description thereof will be omitted. The mounting portion 11 includes a hitch frame 111 extending in the left-right direction, which is the width direction of the traveling vehicle body 2. The hitch frame 111 has a top link connecting portion 1111 connected to the top link and a lower link connecting portion 1112 connected to the lower link, and is configured to be connectable to a three-point link mechanism provided at the rear portion of the traveling vehicle body 2. A gear box 112 is provided at the lower center of the hitch frame 111, and a lawn mower input shaft 113 (see FIG. 3) for receiving power from the traveling vehicle body 2 is provided in the gear box 112. Power is transmitted to the lawn mower input shaft 113 from a PTO shaft (not shown) provided on the traveling vehicle body 2 via a universal joint (not shown).

[0014] Also, as shown in FIGS. 1 and 3, a control box 3 for housing control means (not shown) for performing communication with various controls of the lawn mower 1 and control means of the traveling vehicle body 2 is installed on the front surface of the hitch frame 111. Since the working portion 14 of the lawn mower 1 has a large vibration, by installing the control box 3 on the hitch frame 111 with relatively little vibration, vibration is not applied to the control means housed in the control box 3. Note that the control box 3 is preferably installed at a position as high as possible so that grass and the like before mowing are less likely to get entangled. In the first embodiment, the control box 3 is provided at a high position on the front side of the hitch frame 111, but it is also possible to provide the control box 3 above the hitch frame 111, that is, at a high position. In this way, by installing the control box 3 at a high position, when the control box 3 performs wireless communication with the communication unit of the control means provided on the traveling vehicle body 2 or a portable terminal used by an operator, the distance from the communication unit of these control means and the portable terminal or the like becomes close, so that the communication state can be kept good. In addition, in view of the fact that an operating device including a mobile terminal, a joystick, etc. used by an operator is disposed on the right side of the driver's seat of the traveling vehicle body, or the working unit 14 is offset to the right, so that the operator can perform work while checking the right rear side, in the first embodiment, the control box 3 is disposed so as to be located on the right side of the lawn mower input shaft 113 in a front view or a plan view, and consideration is given to minimizing the distance between the control box 3 and the operating device including a mobile terminal, a joystick, etc. used by the operator. As a result, the wireless communication state between the control box 3 and the mobile terminal, the operating device, etc. used by the operator can be made more stable.

[0015] [Offset mechanism section] The offset mechanism section 12 is a mechanism for offsetting and moving the working unit 14 in a substantially horizontal direction between the storage position and the maximum offset position. Specifically, the offset mechanism section 12 can move the working unit 14 from the storage position shown in FIG. 1 to the maximum offset position shown in FIG. 2. The offset mechanism section 12 includes an offset frame 121, a link rod 122, a support frame 123, and an offset cylinder 124 (offset expansion and contraction member). In the first embodiment, the support frame 123 supports the front gear case 132 (described later) of the power transmission section 13 that rotatably connects the working unit 14, and is configured to offset to the right together with the working unit 14.

[0016] One end (front side) of the offset frame 121 and the link rod 122 is rotatably connected to the hitch frame 111, and the other end (rear side) of the offset frame 121 and the link rod 122 is rotatably connected to the support frame 123. With the above configuration, the hitch frame 111, the offset frame 121, the link rod 122, and the support frame 123 constitute a link mechanism in the shape of a parallelogram with their respective rotation centers as vertices. By this link mechanism, the offset mechanism section 12 can offset and move the working unit 14 while maintaining the angle of the working unit 14 with respect to the traveling direction of the traveling vehicle body 2.

[0017] The offset cylinder 124 is the power source (actuator) of the offset mechanism unit 12, and in the first embodiment, it is composed of an electric hydraulic cylinder. Note that the power source of the offset mechanism unit 12 can also be composed of an electric cylinder, a hydraulic cylinder, etc. instead of the electric hydraulic cylinder. One end of the offset cylinder 124 is rotatably connected to the hitch frame 111, and the other end is rotatably connected to the offset frame 121. By the expansion and contraction of the offset cylinder 124, the offset mechanism unit 12 is driven, and the offset movement amount (the movement amount in the offset direction) of the working unit 14 can be controlled.

[0018] In the first embodiment, the working unit 14 is configured to be in the storage position when the offset cylinder 124 is contracted and in the offset position when the offset cylinder 124 is extended. Conversely, it may be configured such that the working unit 14 is in the storage position when the offset cylinder 124 is extended and in the offset position when the offset cylinder 124 is contracted. In the first embodiment, the working unit 14 is configured to be able to offset to the right outside of the traveling vehicle body 2. Conversely, it may be configured to be able to offset to the left outside, or further configured to be able to offset to both the left and right outside.

[0019] [Power transmission unit] The power transmission unit 13 is a mechanism for transmitting the power from the traveling vehicle body 2 received by the lawn mower input shaft 113 of the mounting unit 11 to the working unit 14. The lawn mower 1 of the first embodiment employs a chain drive mechanism, and the power transmission unit 13 includes at least a drive sprocket, a driven sprocket, and a roller chain wound around them (none of which are shown). Also included in the power transmission unit 13 is a shaft (not shown) connected to the driven sprocket and extending downward, a first bevel gear (not shown) connected to the lower end of this shaft, and a front gear case 132 for housing this first bevel gear. The drive sprocket, driven sprocket, and roller chain are disposed above the offset mechanism unit 12, more specifically, above the offset frame 121, while being housed in the power transmission case 131. Further, on the working unit 14 side of the power transmission unit 13, a cylindrical portion through which a shaft connected to the driven sprocket is inserted extends downward. The cylindrical portion is fixed to the upper part of the support frame 123 and is rotatably fitted to the offset frame 121.

[0020] The power received from the traveling vehicle body 2 by the lawn mower input shaft 113 is transmitted to the first bevel gear via the drive sprocket, roller chain, and driven sprocket. Note that the power transmission unit 13 may use a belt drive mechanism instead of the chain drive mechanism as described above. Also, as the power transmission unit 13, it is also possible to use a drive shaft and bevel gears connected to both ends thereof. Furthermore, the lawn mower 1 may be provided without the power transmission unit 13 and equipped with a drive source such as an electric motor or a hydraulic motor, and the power of the drive source may be directly transmitted to the working unit 14, or the power of the drive source may be transmitted to the working unit 14 via other power transmission means.

[0021] [Working Unit] The working unit 14 is supported by the offset mechanism unit 12. Specifically, the rear gear case 145 attached to the rotor cover 142 is rotatably connected to the front gear case 132 fixed to the lower part of the support frame 123 of the offset mechanism unit 12 via a cylindrical portion, thereby being supported. And as described above, the support frame 123 is rotatably connected to the offset frame 121, and the working unit 14 is offset and moved while maintaining a constant angle with respect to the traveling direction of the traveling vehicle body 2 by the expansion and contraction of the offset cylinder 124.

[0022] The working unit 14 includes a working rotor 141, a rotor cover 142, side plates 143, a cutting blade drive unit 144, a working unit input shaft (not shown), a second bevel gear (not shown), a rear gear case 145 for housing the second bevel gear, a tilt cylinder mounting portion 146, and a gauge roller 147. The working rotor 141 includes a rotating shaft 141a (a rotating shaft to which a grass cutting blade is attached) disposed between the side plates 143 at both ends, and extends in a horizontal direction orthogonal to the traveling direction of the traveling vehicle body 2 when the working unit 14 is in a horizontal state. Although detailed illustration is omitted, a plurality of brackets 141b having a pair of support portions are radially provided on the circumferential surface of the rotating shaft 141a, and the grass cutting blade 141c is attached to the bracket 141b.

[0023] Instead of providing a plurality of brackets 141b having a pair of support portions on the circumferential surface of the rotating shaft 141a, a plurality of protruding portions may be provided on the circumferential surface of the rotating shaft 141a. Also, the grass cutting blade 141c uses two so-called flail blades stacked together, but the shape and structure of the grass cutting blade are not limited, and any other shape and structure may be used. Further, the grass cutting blade 141c may be attached not directly to the bracket 141b but via another member such as a shackle or a ring.

[0024] The working unit 14 rotates the rotating shaft 141a to cut weeds and the like with the grass cutting blade 141c. In the first embodiment, the rotating shaft 141a rotates counterclockwise when viewed from the right. Thereby, the grass cutting blade 141c cuts weeds and the like by hitting them from the rear to the front below the rotating shaft 141a. The cut weeds and the like pass through the rotor cover 142 and the side plates 143, and are finally discharged rearward from the gap between the rotor cover 142 and the ground.

[0025] The rotor cover 142 is a cover member disposed to cover the front, upper, and rear of the working rotor 141. The rotor cover 142 prevents the scattering of weeds cut by the mowing blade, soil adhering to the weeds, small stones falling on the working surface (ground surface), etc., and has the effect of returning the cut weeds etc. back to the mowing blade and finely crushing them. Note that a tilt cylinder mounting portion 146 is erected on the front side of the upper surface of the rotor cover 142. The side plate 143 rotatably supports the rotary shaft 141a via a ball bearing or the like and supports the rotor cover 142. In the first embodiment, a blade drive portion 144 is provided on the leftmost side plate 143.

[0026] The power transmission means in the working portion 14 will be described. The power transmitted to the driven sprocket of the power transmission portion 13 is transmitted to a working portion input shaft (not shown), which is a power input portion of the working portion 14, via a first bevel gear provided at the lower end portion of the shaft of the driven sprocket. The working portion input shaft is a power transmission shaft that connects the first bevel gear in the front gear case 132 and the second bevel gear in the rear gear case 145. The axis of this working portion input shaft is concentric with the rotation axes of the front gear case 132 and the rear gear case 145. Note that in the first embodiment, the working portion input shaft is provided on the right side (inside) of the blade drive portion 144 provided on the left side (outside) of the left side plate 143, but it may be provided on the left side (outside) of the blade drive portion 144.

[0027] The power transmitted to the working portion input shaft is transmitted to the blade drive portion 144 via a second bevel gear provided at the rear end portion of the working portion input shaft. The power transmitted to the blade drive portion 144 is transmitted to the rotary shaft 141a of the working rotor 141. That is, the power transmitted from the power transmission portion 13 to the working portion input shaft is finally directly transmitted to the rotary shaft 141a by the blade drive portion 144. As described above, the front gear case 132 and the rear gear case 145 are relatively rotatable around the axis of the working unit input shaft, and can respond to the vertical rotation of the working unit 14 by the tilt mechanism unit 15 described later.

[0028] In the cutting blade drive unit 144, the power transmitted from the working unit input shaft is transmitted to a drive pulley shaft (not shown), and then from a drive pulley (not shown) to a driven pulley (not shown) via a belt (not shown). Finally, it is transmitted from the driven pulley shaft to the rotary shaft 141a, and the working rotor 141 is driven. The driven pulley shaft and the rotary shaft 141a are concentric. In the first embodiment, a belt drive is adopted as the cutting blade drive unit 144. However, the present invention is not limited to this, and any power transmission means such as a chain drive or a gear drive may be adopted.

[0029] As shown in FIG. 2 and the like, the gauge roller 147 has a pair of left and right arms 147a supported so as to swing about swing fulcrums provided on each of the two side plates 143, and a roller body 147b pivotally supported on the arm 147a. By changing and fixing the swing position of the arm 147a, the height between the roller body 147b and the rotary shaft 141a can be changed, and the cutting height at the grass cutting blade can be adjusted. The roller body 147b is a driven roller that rolls on the grass cutting surface following the movement of the working unit 14. In the first embodiment, when the grass mower 1 and the traveling vehicle body 2 are moving forward, it rotates clockwise when viewed from the right. Further, the gauge roller 147 of the first embodiment is provided with a scraper member 147c for removing grass and the like attached to the roller body 147b. The scraper member 147c is bridged between the pair of arms 147a on the rear end side of the arm 147a and is arranged so as to face the gauge roller 147.

[0030] [Tilt mechanism unit] FIGS. 5 and 6 are views showing the maximum offset state and the upward rotation state of the grass mower 1 according to the first embodiment of the present invention, and FIGS. 7 and 8 are views showing the maximum offset state and the downward rotation state of the grass mower 1 according to the first embodiment of the present invention. In both FIGS. 5 and 7, the upper left figure is a plan view, the lower left figure is a front view (viewed from the rear), the upper right figure is a perspective view viewed from the upper right rear, and the lower right figure is a right side view (viewed from the right). In both FIGS. 6 and 8, the upper figure is a perspective view viewed from the upper right front, the middle figure is a rear view (viewed from the front), and the lower figure is a perspective view viewed from the upper left front. The tilt mechanism unit 15 is a mechanism for rotating (tilting) the working unit 14 in the vertical direction about a tilt axis 151 extending in the front-rear direction, which is the traveling direction of the traveling vehicle body 2. The tilt mechanism unit 15 includes a tilt axis 151, a support arm 152, a tilt cylinder 153 (a telescopic member for tilting), and a tilt axis bracket 154.

[0031] In FIG. 5, in the maximum offset state, the working unit 14 is tilted by the tilt mechanism unit 15 so that the right end portion is upward, that is, it rotates upward counterclockwise when viewed from the rear. The state shown in FIG. 5 is a state in which the working unit 14 performs mowing work on an inclined surface (such as a normal surface) located above the traveling surface of the traveling vehicle body 2. Also, in FIG. 7, in the maximum offset state, the working unit 14 is tilted by the tilt mechanism unit 15 so that the right end portion is downward, that is, it rotates downward clockwise when viewed from the rear. The state shown in FIG. 7 is a state in which the working unit 14 performs mowing work on an inclined surface (such as a normal surface) located below the traveling surface of the traveling vehicle body 2.

[0032] As the structure of the tilt mechanism unit 15, the working unit 14 can be rotated in the vertical direction at any position between the stored state and the maximum offset state. Also, in the first embodiment, the right end portion of the working unit 14 is upward in the state where the tilt cylinder 153 is extended (see FIG. 6), and the right end portion of the working unit 14 is downward in the state where it is contracted (see FIG. 8). Conversely, it may be configured such that the right end portion of the working unit 14 is downward in the state where the tilt cylinder 153 is extended, and the right end portion of the working unit 14 is upward in the state where it is contracted.

[0033] The tilt axis 151 of the tilt mechanism section 15 is fixed such that the rear end portion is concentric with the working section input shaft at the front portion of the front gear case 132 (see Fig. 3). The support arm 152 is fixed to the tilt axis 151 on the upper side. That is, the tilt axis 151 and the support arm 152 are fixed so as not to rotate with respect to the front gear case 132. Further, the front end portion of the tilt axis 151 is rotatably connected to a tilt axis bracket 154 provided on the front side of the upper surface of the rotor cover 142. With such a configuration, the tilt axis bracket 154 (working section 14) can rotate with respect to the support arm 152 (front gear case 132) about the tilt axis 151. Also, one end of the tilt cylinder 153 is pivotally supported on the lower side of the support arm 152, and the other end is pivotally supported on the tilt cylinder mounting portion 146 so as to be rotatable. One end of the tilt cylinder 153 is connected to the offset mechanism section 12 via the front gear case 132 to which the support arm 152 is fixed, and the other end is connected to the working section 14 via the tilt cylinder mounting portion 146. By extending and contracting the tilt cylinder 153, the tilt mechanism section 15 can be driven to control the tilt movement amount (movement amount in the tilt direction) of the working section 14.

[0034] With such a configuration, when the tilt cylinder 153 is extended from the state where the working section 14 shown in Fig. 3 is horizontal, the working section 14 rotates upward about the tilt axis 151, and as shown in Fig. 6, the right end of the working section 14 inclines upward so that it becomes the highest. Then, when the tilt cylinder 153 is contracted from the state where the working section 14 shown in Fig. 3 is horizontal, the working section 14 rotates downward about the tilt axis 151, and as shown in Fig. 8, the right end of the working section 14 inclines downward so that it becomes the lowest.

[0035] [Detection of Offset Movement Amount] Figs. 4(a) and (b) respectively show an enlarged view of the portion surrounded by a circle in the figure and a view of the figure with the offset movement amount detector cover 43 removed. In the lawn mower 1 of the first embodiment, the offset movement amount of the working unit 14 can be detected by detecting the relative rotation angle between the link rod 122 and the hitch frame 111. The offset movement amount detector 4 (detection means) is installed between the hitch frame 111 and the link rod 122. The offset movement amount detector 4 includes an offset movement amount detector main body 41 and an offset movement amount detection arm 42. The offset movement amount detection arm 42 is rotatably provided on the offset movement amount detector main body 41. Further, an offset movement amount detector cover 43 for protecting the offset movement amount detector 4 is attached to the hitch frame 111.

[0036] The offset movement amount detector main body 41 is fixed to the hitch frame 111 side. The base side of the offset movement amount detection arm 42 is rotatably provided with respect to the hitch frame 111 around the axis about which the hitch frame 111 and the link rod 122 rotate relative to each other. The recess formed on the tip side is engaged with the pin 122a protruding from the link rod 122. When the offset mechanism unit 12 operates, the link rod 122 rotates with respect to the hitch frame 111 around the axis about which the hitch frame 111 and the link rod 122 rotate relative to each other, and the rotation angle of the link rod 122 with respect to the hitch frame 111 changes. Then, the offset movement amount detection arm 42 whose tip side is engaged with the link rod 122 also rotates around the axis about which the hitch frame 111 and the link rod 122 rotate relative to each other, and the rotation angle of the offset movement amount detection arm 42 with respect to the offset movement amount detector main body 41 also changes. In the first embodiment, when detecting the offset movement amount of the working unit 14, first, the rotation angle of the offset movement amount detection arm 42 with respect to the offset movement amount detector main body 41 is detected by the offset movement amount detector main body 41. Then, based on the detected rotation angle, the control means in the control box 3 performs arithmetic processing to calculate the offset movement amount of the working unit 14.

[0037] Note that the offset movement amount detector body 41 may be configured using a known angular sensor such as a potentiometer or a rotary encoder. Also, the offset movement amount detector 4 may be any device that can detect the relative rotation angle between the link rod 122 and the hitch frame 111. In this embodiment, the offset movement amount detector 4 indirectly detects the relative rotation angle between the link rod 122 and the hitch frame 111 by detecting the rotation angle of the offset movement amount detection arm 42. However, it is also possible to configure the offset movement amount detector 4 to directly detect the rotation angle of the link rod 122 with respect to the hitch frame 111 without providing the offset movement amount detection arm 42. In such a case of the offset movement amount detector 4, an attachment portion may be provided on the hitch frame 111, the offset movement amount detector body 41 as a sensor may be attached to the attachment portion, and the rotating portion of the sensor may be fixed to the rotation axis of the link rod 122. Alternatively, an attachment portion may be provided on the rotation axis of the link rod 122, the offset movement amount detector body 41 may be attached, and the rotating portion of the sensor may be fixed to the hitch frame 111. In addition to detecting the relative rotation angle between the link rod 122 and the hitch frame 111, it is also possible to detect the relative rotation angle between the offset frame 121 and the hitch frame 111, and the relative rotation angle between the link rod 122 or the offset frame 121 and the support frame 123 that supports the working portion 14 for detecting the offset movement amount. It is also possible to detect the offset movement amount by detecting the expansion and contraction amount of the offset cylinder 124.

[0038] [Detection of tilt movement amount] In FIGS. 3, 6, and 8, the parts surrounded by circles in the left figures are enlarged, and the figures with the tilt movement amount detector cover 53 removed are appended on the right side, respectively. In the first embodiment, in order to detect the tilt movement amount, the relative rotation angle between the tilt axis 151 and the tilt axis bracket 154 is detected. The tilt movement amount detector 5 (detection means) is installed between the tilt axis 151 and the tilt axis bracket 154. The tilt movement amount detector 5 includes a tilt movement amount detector main body 51 and a tilt movement amount detection arm 52. The tilt movement amount detection arm 52 is rotatably provided on the tilt movement amount detector main body 51. Further, a tilt movement amount detector cover 53 for protecting the tilt movement amount detector 5 is attached to the tilt axis bracket 154 (see the enlarged view in the upper left of the upper figure in FIG. 3).

[0039] The tilt movement amount detector main body 51 is fixed to the tip of the tilt axis 151. The base side of the tilt movement amount detection arm 52 is provided so as to be rotatable with respect to the tilt axis 151 around the central axis of the tilt axis 151, and the recess formed on the tip side is engaged with the pin 154a protruding from the tilt axis bracket 154. When the tilt mechanism unit 15 operates, the tilt axis bracket 154 rotates with respect to the tilt axis 151 around the central axis of the tilt axis 151, and the rotation angle of the tilt axis bracket 154 with respect to the tilt axis 151 changes. Then, the tilt movement amount detection arm 52 whose tip side is engaged with the tilt axis bracket 154 also rotates around the central axis of the tilt axis 151, and the rotation angle of the tilt movement amount detection arm 52 whose tip side is engaged with the tilt axis bracket 154 with respect to the tilt movement amount detector main body 51 also changes. In the first embodiment, when detecting the tilt movement amount of the working unit 14, first, the rotation angle of the tilt movement amount detection arm 52 with respect to the tilt movement amount detector main body 51 is detected by the tilt movement amount detector main body 51. Then, based on the detected rotation angle, the control means in the control box 3 performs arithmetic processing to calculate the tilt movement amount of the working unit 14.

[0040] Note that the tilt movement amount detector main body 51 may be configured using a known angle sensor such as a potentiometer or a rotary encoder. Further, the tilt movement amount detector 5 only needs to be able to detect the relative rotation angle between the tilt axis 151 and the tilt axis bracket 154, and it is also possible to configure the tilt movement amount detector 5 without providing the tilt movement amount detection arm 52. In the case of such a tilt movement amount detector 5, an attachment portion may be provided on the tilt axis bracket 154 to attach the tilt movement amount detector main body 51 serving as a sensor, and the rotating portion of the sensor may be fixed to the tilt axis 151. Alternatively, an attachment portion may be provided on the tilt axis 151 to attach the tilt movement amount detector main body 51, and the rotating portion of the sensor may be fixed to the tilt axis bracket 154. Further, the detection of the tilt movement amount can also be performed by providing a sensor for detecting the expansion and contraction amount of the tilt cylinder 153 and detecting the expansion and contraction amount of the tilt cylinder 153 with this sensor.

[0041] [Movement amount display] FIG. 9 is a diagram for explaining the display contents when the offset state and the tilt state of the lawn mower 1 according to Embodiment 1 of the present invention are displayed on the display screen. The detection results detected by the offset movement amount detector 4 and the tilt movement amount detector 5 are transmitted to the control means in the control box 3. The control means in the control box 3 calculates the offset movement amount and the tilt movement amount based on the transmitted detection results. The calculated offset movement amount and tilt movement amount are used for various controls of the lawn mower 1 and are also transmitted to the control means of the traveling vehicle body 2. The control means of the traveling vehicle body 2 also stores a program (tilt amount display program) for displaying the offset movement amount and the tilt movement amount on the display device provided on the traveling vehicle body 2 based on the offset movement amount and the tilt movement amount transmitted from the control means in the control box 3. If the tilt amount display program is stored in a PC, a tablet, a mobile terminal such as a smartphone, etc., by transmitting the calculated offset movement amount and tilt movement amount to the PC, the tablet, the mobile terminal such as a smartphone, etc., it is also possible to display the offset movement amount and the tilt movement amount on the display unit (display device) of the PC, the tablet, the mobile terminal such as a smartphone, etc.

[0042] Note that the detection result transmitted to the control means in the control box 3 may be directly transmitted to the control means of the traveling vehicle body 2. In this case, the offset movement amount and the tilt movement amount are calculated by the control means of the traveling vehicle body 2, and a program for causing the display device provided on the traveling vehicle body 2 to display the offset movement amount and the tilt movement amount calculated by the control means of the traveling vehicle body 2 is stored. Similarly, if a program for calculating the offset movement amount and the tilt movement amount is caused to be calculated by a PC, a portable terminal such as a tablet or a smartphone, and the offset movement amount and the tilt movement amount are displayed on the PC, the tablet, the smartphone, etc. based on the calculation result, the detection result transmitted to the control means in the control box 3 may be directly transmitted to a PC, a portable terminal such as a tablet or a smartphone, so that the offset movement amount and the tilt movement amount can be displayed on the display unit of the PC, the tablet, the smartphone, etc.

[0043] As shown in FIG. 9, the mounting portion 11 and the working portion 14 are schematically shown in a view of the traveling vehicle body 2 seen from the rear. FIG. 9 shows the storage state of the working portion 14 in the upper stage, the offset state of the working portion 14 in the middle stage, and the maximum offset state of the working portion 14 in the lower stage. The left column shows the horizontal state of the working portion 14, the middle column shows the downward rotation state of the working portion 14 (the tilt movement amount in the upper stage: small, the tilt movement amount in the middle stage: medium, the tilt movement amount in the lower stage: large), and the right column shows the upward rotation state of the working portion 14 (the tilt movement amount in the upper stage: small, the tilt movement amount in the middle stage: medium, the tilt movement amount in the lower stage: large). In the first embodiment, the offset movement amount is displayed in three stages: the storage state, the offset state, and the maximum offset state, and the tilt movement amount (rotation angle) is displayed in seven stages different according to the tilt movement amount (the horizontal state, three stages of large, medium, and small tilt movement amounts in the downward rotation state, and three stages of large, medium, and small tilt movement amounts in the upward rotation state). A total of 21 types of figures are stored in the control means of the traveling vehicle body 2 in association with the detection values by the offset movement amount detector 4 and the tilt movement amount detector 5. FIG. 9 illustrates nine of those figures. Then, based on the detection results detected by the offset movement amount detector 4 and the tilt movement amount detector 5, the control means of the traveling vehicle body 2 indicates on the display device the state of the working unit 14. For example, when the offset movement amount is the maximum offset movement amount and the tilt movement amount is in the upward rotation state, the second figure from the top in the right column of FIG. 9 is illustrated on the display screen.

[0044] In this way, by illustrating the offset movement amount and the tilt movement amount on the display device provided on the traveling vehicle body 2, the operator can monitor and easily grasp the offset movement amount and the tilt movement amount without looking back. Also, the operator can appropriately operate the lawn mower 1 according to the monitoring result. In the present embodiment, a horizontal button (not shown) for making the working unit 14 horizontal is provided on a joystick (not shown) serving as an operating device of the lawn mower 1. When the operator wants to make the working unit 14 horizontal based on the monitoring result, when the operator presses the horizontal button, a signal is transmitted to the control unit of the lawn mower 1, and the control unit of the lawn mower 1 expands and contracts the tilt cylinder 153. The expansion and contraction amount of the tilt cylinder 153 is controlled based on the tilt movement amount detector main body 51, and the working unit 14 becomes horizontal.

[0045] In addition to the display by the figure, the display of the offset movement amount and the tilt movement amount can also be an index display of the movement amount (such as the offset movement amount and the rotation angle) in numerical values. The numerical value to be displayed may be the calculated numerical value of the offset movement amount or the rotation angle, or may be a stepped numerical value obtained by dividing these numerical values of the offset movement amount and the rotation angle into a plurality of steps (for example, numerical values of 1 to 5 divided into 5 steps). In addition, the display content such as display by figure and display by numerical value can be changed as appropriate. For example, instead of displaying the offset movement amount and the tilt movement amount in a plurality of predetermined steps as in the present embodiment, it is also possible to display the offset movement amount and the tilt movement amount as they are (continuously). Further, in the present embodiment, the offset movement amount and the tilt movement amount are illustrated in a single drawing, but it is also possible to illustrate the offset movement amount and the tilt movement amount individually, such as illustrating only the offset movement amount or only the tilt movement amount. Furthermore, the operator can arbitrarily select what kind of display content to use (for example, only the illustrated display of the state, or also displaying the numerical index of the state together with the illustrated state). In addition, the display of the offset movement amount and the tilt movement amount is not limited to being displayed on the display device provided on the traveling vehicle body 2. Moreover, when using other remote control devices (remote controls) of the lawn mower 1, mobile terminals such as smartphones (these may be collectively referred to as electronic devices), the control means of the lawn mower 1 and the electronic device communicate with each other, and it is also possible to display on the display devices of these electronic devices.

[0046] [Tilt movement amount display gauge] In FIGS. 2, 5, and 7, enlarged views of the tilt movement amount display gauge 6 (display gauge) provided at the front part of the front gear case 132 are appended respectively. In the first embodiment, in addition to displaying the offset movement amount and the tilt movement amount by the display device provided on the traveling vehicle body 2, the lawn mower 1 is provided with a tilt movement amount display gauge 6 capable of displaying the tilt movement amount. The tilt movement amount display gauge 6 has a tilt movement amount display scale 61 and a tilt movement amount display pointer 62. The tilt movement amount display scale 61 is concentric with the tilt axis 151 provided at the front part of the front gear case 132, and is formed on the front end side of the outer peripheral surface of a cylindrical tilt axis cover 151a provided so as to cover the tilt axis 151. This tilt axis cover 151a is fixed together with the tilt axis 151 of the tilt mechanism part 15 so that the rear end part is concentric with the working part input axis at the front part of the front gear case 132. That is, the tilt axis cover 151a is fixed together with the tilt axis so as not to rotate with respect to the front gear case 132. The tilt movement amount display pointer 62 is formed on the rear end side of the outer peripheral surface of the tilt movement amount detector cover 53. The tilt movement amount detector cover 53 is attached to the tilt axis bracket 154 as described above, and tilts (rotates up and down) integrally with the working part 14. The outer peripheral surface of the tilt axis cover 151a on which the tilt movement amount display scale 61 is formed and the outer peripheral surface of the tilt movement amount detector cover 53 on which the tilt movement amount display pointer 62 is formed are configured to be substantially flush.

[0047] As described above, when the tilt mechanism part 15 operates, since the rotation angle of the tilt axis bracket 154 with respect to the tilt axis 151 changes, the tilt axis cover 151a and the tilt movement amount detector cover 53 attached to the tilt axis bracket 154 rotate relative to each other. The tilt movement amount display pointer 62 formed on the tilt movement amount detector cover 53 rotates with respect to the tilt movement amount display scale 61 formed on the tilt axis cover 151a, and indicates the tilt movement amount display scale 61 corresponding to the tilt movement amount. As shown in FIG. 2, when the working unit 14 is in a horizontal state, the tilt movement amount display pointer 62 points to the central tilt movement amount scale 61. When the working unit 14 tilts upward, the tilt movement amount display pointer 62 rotates counterclockwise (when viewed from the rear). As shown in FIG. 5, when the working unit 14 tilts upward most, that is, in the maximum upward tilt state, the tilt movement amount display pointer points to the leftmost tilt movement amount scale 61. On the other hand, when the working unit 14 tilts downward, the tilt movement amount display pointer 62 rotates clockwise (when viewed from the rear). As shown in FIG. 7, when the working unit 14 tilts downward most, that is, in the maximum downward tilt state, the tilt movement amount display pointer 62 points to the rightmost tilt movement amount scale 61.

[0048] Note that the central tilt movement amount scale 61 corresponding to the horizontal state of the working unit 14 is preferably in a different form (for example, the length of the scale line is longer, the color of the scale line is different) from the tilt movement amount scale 61 indicated when the working unit 14 is rotating (tilting). Thereby, the operator can accurately grasp whether the working unit 14 is in a horizontal state. Further, in the present embodiment, the tilt axis cover 151a provided with the tilt movement amount scale 61 is configured in a cylindrical shape, but it is not necessary to be limited to this shape, and it can be appropriately changed as long as it can cover the tilt axis 151. For example, the portion provided with the tilt movement amount scale 61 may be configured in an arc shape when viewed from the front (including a semi-circular shape or a spherical shape including a hemispherical shape for the portion provided with the tilt movement amount scale 61), a polygonal shape, or the like. Also, the shape of the tilt movement amount detector cover 53 is not limited to a specific shape and can be appropriately changed according to the shape of the tilt axis cover 151a.

[0049] Since the tilt movement amount display gauge 6 is provided in front of the front gear case 132, it can be easily visually recognized from the driver's seat. Note that in the stored state of the lawn mower 1 as shown in FIG. 1, the tilt movement amount display gauge 6 is hidden by the mounting portion 11 and the power transmission portion 13, making it difficult to visually recognize from the driver's seat. However, in the stored state of the lawn mower 1, tilting movement is generally hardly performed, so there is no problem. Note that the tilt movement amount display scale 61 may be formed on the outer peripheral surface of the tilt movement amount detector cover 53, and the tilt movement amount display pointer 62 may be formed on the outer peripheral surface of the tilt shaft cover 151a, respectively. The tilt movement amount is detected by the tilt movement amount detector 5 and displayed on a display device or the like. In particular, when working with the working unit 14 offset to the right, the operator may work while checking the right rear in order to confirm the finish of mowing and the location where mowing is performed. At this time, the tilt movement amount can be confirmed by the tilt movement amount display gauge 6.

[0050] [Offset movement amount display gauge] The above tilt movement amount display gauge 6 displays the tilt movement amount of the working unit 14. Similarly, an offset movement amount display gauge (display gauge) for detecting and displaying the offset movement amount of the working unit 14 may be provided. The offset movement amount display gauge is preferably provided at the mounting portion 11 close to the driver's seat so as to be easily visible from the driver's seat. Due to the offset movement of the working unit 14, the offset mechanism portion 12 and the power transmission portion 13 rotate with respect to the mounting portion 11. The offset movement amount display gauge may be configured to detect and display this rotational movement amount. The offset movement amount display gauge has an offset movement amount display scale and an offset movement amount display pointer. If one of the offset movement amount display scale and the offset movement amount display pointer is formed on the hitch frame 111 of the mounting portion 11 and the other is formed on the power transmission case 131 of the power transmission portion 13, the driver's seat can be easily visible. Note that depending on the specific configuration of the offset mechanism portion 12 and the power transmission portion 13, if the offset mechanism portion 12 can be easily visible from the driver's seat, it may be formed on the offset frame 121, link rod 122 or offset cylinder 124 of the offset mechanism portion 12.

[0051] In the first embodiment, both the tilt movement amount detector 5 and the tilt movement amount display gauge 6 are provided for tilt movement, but only one of them may be provided. Also, regarding the offset movement, instead of providing the offset movement amount detector 4, only the offset movement amount display gauge may be provided. Also, for both the tilt movement and the offset movement, it is not necessary to provide a movement amount detector or a movement amount display gauge. It is also possible to provide a movement amount detector or a movement amount display gauge only for the tilt movement or only for the offset movement.

[0052] [Embodiment 2] FIG. 10 is a view showing the stored state and the horizontal state of the lawn mower 7 according to Embodiment 2 of the present invention. FIG. 11 is a view showing the maximum offset state and the horizontal state of the lawn mower 7 according to Embodiment 2 of the present invention. FIG. 12 is a view showing the maximum offset state and the upward pivoting state of the lawn mower 7 according to Embodiment 2 of the present invention. FIG. 13 is a view showing the maximum offset state and the downward pivoting state of the lawn mower 7 according to Embodiment 2 of the present invention. In each case, the upper left figure is a perspective view seen from the upper right front, the upper middle figure is a plan view, the upper right figure is a perspective view seen from the upper left front, the lower left figure is a front view (viewed from the front), and the lower right figure is a right side view (viewed from the left).

[0053] [Overall Structure] The lawn mower 7 in the present Embodiment 2 includes a mounting portion 71, an offset mechanism portion 72, a power transmission portion 73, a working portion 74, and a tilt mechanism portion 75. The lawn mower 7 is connected to a traveling vehicle body 2 (see FIG. 9) such as a tractor by the mounting portion 71. The mounting portion 71 and the working portion 74 are connected via the offset mechanism portion 72 and the power transmission portion 73. Thereby, as the traveling vehicle body 2 travels, the lawn mower 7 moves forward, and the lawn mowing operation by the working portion 74 is performed.

[0054] As will be described later, the working unit 74 can be moved by the operation of the offset mechanism unit 72 from the position shown in FIG. 10 to a position offset to the right side shown in FIG. 11. The position shown in FIG. 10 is a storage position where the working unit 74 is located at the rear position of the traveling vehicle body 2, and the state where the working unit 74 is in the storage position is referred to as a storage state. The position shown in FIG. 11 is the maximum offset position where the working unit 14 is offset to the outermost right side in the direction orthogonal to the traveling direction of the traveling vehicle body 2 with respect to the traveling vehicle body 2, and the state where the working unit 14 is in the maximum offset position is referred to as the maximum offset state.

[0055] In the lawn mower 7 of the second embodiment, the mowing operation can be performed regardless of the position of the working unit 74 between the storage position and the maximum offset position. Also, it can be arbitrarily set within what range between the storage state as shown in FIG. 10 and the maximum offset state as shown in FIG. 11 the mowing operation can be performed. For example, the mowing operation may not be possible in the storage state, or the mowing operation may be possible only at specific locations between the storage state and the maximum offset state. That is, the mowing operation may be made possible only within a specific range or at a specific position.

[0056] [Mounting portion] The mounting portion 71 is connected to a three-point link mechanism (not shown) provided between the two rear tires 21 (see FIG. 9) of the traveling vehicle body 2. The three-point link mechanism is usually composed of a top link, a lift rod, a lower link, and the like. Since the three-point link mechanism is a known mechanism, a detailed description thereof will be omitted. The mounting portion 71 includes a hitch frame 711 that extends in the left - right direction, which is the width direction of the traveling vehicle body 2. The hitch frame 711 has a top link connection portion 7111 connected to the top link and a lower link connection portion 7112 connected to the lower link, and is configured to be connectable to a three - point link mechanism provided at the rear of the traveling vehicle body 2. A gearbox 712 is provided at the lower center of the hitch frame 711, and a lawn mower input shaft 713 that receives power from the traveling vehicle body 2 is provided in this gearbox 712. Power is transmitted to the lawn mower input shaft 713 from a PTO shaft (not shown) provided on the traveling vehicle body 2 via a universal joint (not shown).

[0057] Also, as shown in FIGS. 10, 11, and 13, a control box 3 that houses control means (not shown) for performing various controls of the lawn mower 7 and communication with control means of the traveling vehicle body 2 and the like is installed on the upper surface of the hitch frame 711. The working portion 74 of the lawn mower 7 has large vibrations. By installing the control box 3 on the hitch frame 711 with relatively less vibration, vibration is not applied to the control means housed in the control box 3. Note that the control box 3 is preferably installed at as high a position as possible on the hitch frame 711 so that grass and the like before mowing are less likely to get entangled. In the second embodiment, the control box 3 is provided on the upper surface of the hitch frame 711, but it is also possible to provide the control box 3 above the hitch frame 711, that is, at a higher position. In this way, by installing the control box 3 at a high position on the hitch frame 711, when the control box 3 performs wireless communication with the communication portion of the control means provided on the traveling vehicle body 2 or a portable terminal used by an operator, the distance between the communication portion of these control means and the portable terminal and the like becomes close, so that the communication state can be kept good.

[0058] [Offset mechanism section] The offset mechanism unit 72 is a mechanism for offsetting and moving the working unit 74 in a substantially horizontal direction between the storage position and the maximum offset position. Specifically, the offset mechanism unit 72 can move the working unit 74 from the storage position shown in FIG. 10 to the maximum offset position shown in FIG. 11. The offset mechanism unit 72 includes an offset frame 721, a link rod 722, a support frame 723, and an offset cylinder 724 (offset telescopic member). In the second embodiment, the support frame 723 rotatably connects to an offset mechanism connection part 745 (described later) of the working unit 74. That is, the offset mechanism unit 72 supports the working unit 74 by the support frame 723 and the offset mechanism connection part 745, and is configured to offset the working unit 74 to the right. Note that the support frame 723 may be configured to rotatably connect to an offset connection shaft (described later) of the working unit 74.

[0059] One end (front side) of the offset frame 721 and the link rod 722 is rotatably connected to the hitch frame 711, and the other end (rear side) of the offset frame 721 and the link rod 722 is rotatably connected to the support frame 723. With the above configuration, the hitch frame 711, the offset frame 721, the link rod 722, and the support frame 723 form a link mechanism in the shape of a parallelogram with the respective rotation centers as vertices. By this link mechanism, the offset mechanism unit 72 can offset and move the working unit 74 while maintaining the angle of the working unit 74 with respect to the traveling direction of the traveling vehicle body 2.

[0060] The offset cylinder 724 is the power source (actuator) of the offset mechanism unit 72, and in the second embodiment, it is composed of an electro-hydraulic cylinder. Note that the power source of the offset mechanism unit 72 can also be composed of an electric cylinder, a hydraulic cylinder, etc. instead of the electro-hydraulic cylinder. One end of the offset cylinder 724 is rotatably connected to the hitch frame 711, and the other end is rotatably connected to the support frame 723. By the expansion and contraction of the offset cylinder 724, the offset mechanism unit 72 is driven, and the offset movement amount (the movement amount in the offset direction) of the working unit 74 can be controlled.

[0061] In the second embodiment, the working unit 74 is configured to be in the storage position when the offset cylinder 724 is extended and in the offset position when the offset cylinder 724 is contracted. Conversely, it may be configured such that the working unit 14 is in the storage position when the offset cylinder 724 is contracted and in the offset position when the offset cylinder 724 is extended. In the second embodiment, the working unit 74 is structured to be offset to the right outside of the traveling vehicle body 2. Conversely, it may be structured to be offset to the left outside, or further structured to be offset to both the left and right outside.

[0062] [Power transmission unit] The power transmission unit 73 is a mechanism for transmitting the power from the traveling vehicle body 2 received by the lawn mower input shaft 713 of the mounting unit 71 to the working unit 74. The lawn mower 7 of the second embodiment employs a transmission mechanism using universal joints. The power transmission unit 13 includes a universal joint 731 on the mounting unit 71 side, a universal joint 732 on the working unit 74 side, and a drive shaft 733 between the two universal joints. The two universal joints 731 and 732 are arranged to the left of the offset mechanism unit 72. The universal joint 732 on the working unit 74 side is connected to a working unit input shaft (not shown) which is the power input part of the working unit 74.

[0063] Note that the grass mower 7 may be provided with a drive source such as an electric motor or a hydraulic motor instead of the power transmission unit 73, and the power of the drive source may be directly transmitted to the working unit 74, or the power of the drive source may be transmitted to the working unit 74 via other power transmission means.

[0064] [Working unit] As described above, the working unit 74 is supported by the offset mechanism unit 72. Specifically, the offset mechanism connecting portion 745 of the working unit 74 is rotatably connected to the support frame 723 of the offset mechanism unit 72, thereby being supported. And, as described above, the working unit 74 is offset by the expansion and contraction of the offset cylinder 724 while keeping the angle with respect to the traveling direction of the traveling vehicle body 2 constant. Note that instead of the offset mechanism connecting portion 745, the working unit 74 may be configured to be supported by rotatably connecting the offset connecting shaft of the working unit 74 to the support frame 723 of the offset mechanism unit 72. In this case, a cover is attached around the offset connecting shaft.

[0065] The working unit 74 includes a working rotor 741, a rotor cover 742, side plates 743, a cutting blade drive unit 744, a working unit input shaft, an offset mechanism connecting portion 745, a tilt cylinder mounting portion 746, and a gauge roller 747. The working rotor 741 includes a rotating shaft 741a (refer to the right figure at the lower part of FIG. 13, the rotating shaft to which the grass cutting blade is attached) disposed between the side plates 743 at both ends, and extends in a horizontal direction orthogonal to the traveling direction of the traveling vehicle body 2 when the working unit 74 is in a horizontal state. Although not shown, as in the first embodiment, a plurality of brackets having a pair of support portions are radially provided on the peripheral surface of the rotating shaft 741a, and the grass cutting blades are attached to the brackets.

[0066] Note that instead of providing a plurality of brackets having a pair of support portions on the peripheral surface of the rotating shaft 741a, a plurality of protruding portions may be provided on the peripheral surface of the rotating shaft 741a. Further, the grass cutting blade uses two so-called flail blades stacked together, but the shape and structure of the grass cutting blade are not limited, and it may have any other shape and structure. Further, the grass cutting blade may be attached not directly to the bracket but via another member such as a shackle or a ring.

[0067] The working unit 74 rotates the rotating shaft 741a and cuts weeds and the like with the grass cutting blade. In the second embodiment, the rotating shaft 741a rotates clockwise when viewed from the left. As a result, the grass cutting blade cuts weeds and the like from the rear to the front below the rotating shaft 741a. The cut weeds and the like pass through the rotor cover 742 and the side plate 743 and are finally discharged rearward from the gap between the rotor cover 742 and the ground.

[0068] The rotor cover 742 is a cover member that is disposed to cover the front, upper, and rear of the working rotor 741. The rotor cover 742 prevents the scattering of weeds and the like cut by the grass cutting blade, soil adhering to the weeds and the like, and small stones falling on the working surface (ground surface), and has the effect of returning the cut weeds and the like to the grass cutting blade again and finely crushing them. The side plate 743 rotatably supports the rotating shaft 741a via a ball bearing or the like and supports the rotor cover 742. In the second embodiment, a blade drive unit 744 is provided for the left end side plate 743. Further, an offset mechanism connecting portion 745 connected to the support frame 723 of the offset mechanism portion 72 described above is provided on the left side of the upper surface of the rotor cover 742, and a tilt cylinder mounting portion 746 is erected on the front side of the upper surface of the rotor cover 742.

[0069] The power transmission means in the working unit 74 will be described. The power transmitted to the universal joint 732 of the power transmission unit 73 is transmitted to the working unit input shaft which is the power input unit of the working unit 74. On the left outer side of the left side plate 743 of the working unit 14, a cutting blade drive unit 744 is arranged to transmit the power input to the working unit input shaft to the rotating shaft 741a of the working rotor 741. The working unit input shaft is arranged on the left outer side of the cutting blade drive unit 744. Note that the working unit input shaft can also be arranged on the right inner side of the cutting blade drive unit 744.

[0070] The power transmitted to the working unit input shaft is transmitted to the cutting blade drive unit 744 via a bevel gear (not shown) provided at the rear end of the working unit input shaft. The power transmitted to the cutting blade drive unit 744 is transmitted to the rotating shaft 741a of the working rotor 741. That is, the power transmitted from the power transmission unit 73 to the working unit input shaft is finally directly transmitted to the rotating shaft 741a by the cutting blade drive unit 744. In the cutting blade drive unit 744, the power transmitted from the working unit input shaft is transmitted to a drive pulley shaft (not shown), then transmitted from a drive pulley (not shown) to a driven pulley (not shown) via a belt (not shown), and finally transmitted from the driven pulley shaft to the rotating shaft 741a to drive the working rotor 741. The driven pulley shaft and the rotating shaft 741a are concentric. Note that in the first embodiment, a belt drive is adopted as the cutting blade drive unit 744, but it is not limited to this, and any power transmission means such as a chain drive or a gear drive may be adopted.

[0071] As shown in FIG. 11 etc., the gauge roller 747 has a pair of left and right arms 747a supported so as to swing about a swing fulcrum provided on each of the two side plates 743, and a roller body 747b pivotally supported on the arm 747a. By changing and fixing the swing position of the arm 747a, the height between the roller body 747b and the rotating shaft 741a can be changed, and the cutting height at the grass cutting blade can be adjusted. The roller body 747b is a driven roller that rolls on the mowing surface following the movement of the working unit 74. In the second embodiment, when the mower 7 and the traveling vehicle body 2 are moving forward, it rotates clockwise when viewed from the right. Further, in the gauge roller 747 of the second embodiment, a scraper member for removing grass and the like adhering to the roller body 747b is not provided, but a scraper member may be provided as in the first embodiment.

[0072] [Tilt mechanism section] FIG. 12 is a view showing the upward rotation state of the mower 7 according to the second embodiment of the present invention, and FIG. 13 is a view showing the downward rotation state of the mower 7 according to the second embodiment of the present invention. The tilt mechanism section 75 is a mechanism for rotating (tilting) the working unit 74 in the vertical direction about a tilt axis (not shown), which is a shaft that rotatably connects the support frame 723 of the offset mechanism section 72 to the offset mechanism connection section 745 of the working unit 74. The tilt axis is arranged so as to extend parallel to the front-rear direction, which is the traveling direction of the traveling vehicle body 2. The tilt mechanism section 75 has a tilt axis, a support arm 752, and a tilt cylinder 753 (a telescopic member for tilting). In FIG. 12, the working unit 74 is in the maximum offset state and is tilted by the tilt mechanism section 75 so that the right end portion is upward, that is, it rotates upward counterclockwise when viewed from the rear. The state shown in FIG. 12 is a state in which the working unit 74 performs mowing work on an inclined surface (such as a normal surface) located above the traveling surface of the traveling vehicle body 2. Further, in FIG. 13, the working unit 74 is in the maximum offset state and is tilted by the tilt mechanism section 75 so that the right end portion is downward, that is, it rotates downward clockwise when viewed from the rear. The state shown in FIG. 13 is a state in which the working unit 14 performs mowing work on an inclined surface (such as a normal surface) located below the traveling surface of the traveling vehicle body 2.

[0073] As the structure of the tilt mechanism section 75, the working unit 74 can be rotated in the vertical direction at any position between the stored state and the maximum offset state. In addition, in the second embodiment, the right end of the working unit 74 is configured to be upward when the tilt cylinder 753 is extended (see FIG. 12), and the right end of the working unit 74 is configured to be downward when the tilt cylinder 753 is contracted (see FIG. 13). Conversely, the right end of the working unit 74 may be configured to be downward when the tilt cylinder 753 is extended, and the right end of the working unit 74 may be configured to be upward when the tilt cylinder 753 is contracted.

[0074] The tilt axis of the tilt mechanism unit 75 has its rear end fixed to the front part of the offset mechanism connection part 745. That is, the tilt axis is fixed so as not to rotate with respect to the offset mechanism connection part 745. Also, above the front part of the tilt axis, the upper side of the support arm 752 and the support frame 723 of the offset mechanism unit 72 are rotatably connected. The upper side of the support arm 752 and the support frame 723 of the offset mechanism unit 72 are connected to each other so as not to rotate relative to each other. With such a configuration, the offset mechanism connection part 745 (working unit 74) is rotatable with respect to the support frame 723 of the offset mechanism unit 72 about the tilt axis. One end of the tilt cylinder 753 is pivotally supported rotatably on the lower side of the support arm 752, and the other end is pivotally supported on the tilt cylinder attachment part 746. One end of the tilt cylinder 753 is connected to the offset mechanism unit 72 via the support frame 723 to which the support arm 752 is fixed, and the other end is connected to the working unit 74 via the tilt cylinder attachment part 746. By the expansion and contraction of the tilt cylinder 753, the tilt mechanism unit 75 is driven, and the tilt movement amount (movement amount in the tilt direction) of the working unit 74 can be controlled.

[0075] With such a configuration, when the tilt cylinder 753 is extended from the state where the working unit 74 is horizontal as shown in FIG. 11, the working unit 74 rotates upward about the tilt axis, and as shown in FIG. 12, it tilts upward so that the right end of the working unit 74 is the highest. Then, when the tilt cylinder 753 is contracted from the state where the working unit 74 is horizontal as shown in FIG. 11, the working unit 74 rotates downward about the tilt axis, and as shown in FIG. 13, it tilts downward so that the right end of the working unit 74 is the lowest.

[0076] [Detection of Offset Movement Amount] In the upper middle figure of FIG. 10, an enlarged view of the state where the offset movement amount detector cover 43 at the location where the offset frame 721 is rotatably connected to the hitch frame 711 is removed is appended. Similarly, in the upper middle figure of FIG. 11, an enlarged view of the state where the offset movement amount detector cover 43 at the location where the offset frame 721 is rotatably connected to the hitch frame 711 is removed is appended. In the lawn mower 7 of the second embodiment, the offset movement amount of the working unit 74 can be detected by detecting the relative rotation angle between the offset frame 721 and the hitch frame 711. The offset movement amount detector 4 is installed between the hitch frame 711 and the offset frame 721. The offset movement amount detector 4 has an offset movement amount detector main body 41 and an offset movement amount detection arm 42, similar to the first embodiment. The offset movement amount detection arm 42 is rotatably provided on the offset movement amount detector main body 41. Also, an offset movement amount detector cover 43 for protecting the offset movement amount detector 4 is attached to the hitch frame 711.

[0077] The offset movement amount detector body 41 is fixed to the hitch frame 711 side. Also, the offset movement amount detection arm 42 is provided so as to be rotatable with respect to the hitch frame 711 with the axis about which the hitch frame 711 and the offset frame 721 rotate relative to each other as the rotation center. The recess formed on the tip side is engaged with the pin 721a protruding from the offset frame 721. When the offset mechanism portion 72 operates, the offset frame 721 rotates with respect to the hitch frame 711 about the axis about which the hitch frame 711 and the offset frame 721 rotate relative to each other, and the rotation angle of the offset frame 721 with respect to the hitch frame 711 changes. (Refer to the enlarged views of FIGS. 10 and 11.) Then, the offset movement amount detection arm 42 whose tip side is engaged with the offset frame 721 also rotates about the axis about which the hitch frame 711 and the offset frame 721 rotate relative to each other, and the rotation angle of the offset movement amount detection arm 42 with respect to the offset movement amount detector body 41 also changes. In the second embodiment, when detecting the offset movement amount of the working portion 74, first, the offset movement amount detector body 41 detects the rotation angle of the offset movement amount detection arm 42 with respect to the offset movement amount detector body 41. Then, based on the detected rotation angle, the control means in the control box 3 performs arithmetic processing to calculate the offset movement amount of the working portion 74.

[0078] Note that the offset movement amount detector body 41 may be configured using a known sensor such as a potentiometer or a rotary encoder. Further, the offset movement amount detector 4 only needs to be able to detect the relative rotation angle between the offset frame 721 and the hitch frame 711, and does not necessarily have to have an offset movement amount detection arm 42. In the present embodiment, the offset movement amount detector 4 detects the rotation angle of the offset movement amount detection arm 42 to indirectly detect the relative rotation angle between the offset frame 721 and the hitch frame 711. However, it is also possible to configure the offset movement amount detector 4 to directly detect the rotation angle of the offset frame 721 with respect to the hitch frame 711 without providing the offset movement amount detection arm 42. In the case of such an offset movement amount detector 4, a mounting portion may be provided on the hitch frame 711, and the offset movement amount detector body 41, which is a sensor, may be attached to the mounting portion, and the rotating portion of the sensor may be fixed to the rotation axis of the offset frame 721. Alternatively, a mounting portion may be provided on the rotation axis of the offset frame 721, the offset movement amount detector body 41 may be attached, and the rotating portion of the sensor may be fixed to the hitch frame 711. In addition to detecting the relative rotation angle between the offset frame 721 and the hitch frame 711, the detection of the offset movement amount can also be performed by detecting the relative rotation angle between the link rod 722 and the hitch frame 711, or the relative rotation angle between the offset frame 721 or the link rod 722 and the support frame 723 that supports the working unit 74. Also, the detection of the offset movement amount can be performed by detecting the amount of expansion and contraction of the offset cylinder 724.

[0079] [Detection of tilt movement amount] In FIGS. 10, 11, 12, and 13, the parts surrounded by circles in the upper right figures are enlarged and the figures in the state where the tilt movement amount detector cover 53 is removed are appended respectively. In the second embodiment, in order to detect the tilt movement amount, the relative rotation angle between the tilt axis and the support arm 752 is detected. The tilt movement amount detector 5 is installed between the tilt axis and the support arm 752. The tilt movement amount detector 5 includes a tilt movement amount detector main body 51 and a tilt movement amount detection arm 52 (neither is shown clearly in the figure). The tilt movement amount detection arm 52 is rotatably provided on the tilt movement amount detector main body 51. Further, a tilt movement amount detector cover 53 for protecting the tilt movement amount detector 5 is attached to the support frame 723 of the offset mechanism portion 72.

[0080] The tilt movement amount detector main body 51 is fixed to the tip of the tilt axis. Also, the base side of the tilt movement amount detection arm 52 is provided so as to be rotatable with respect to the tilt axis around the central axis of the tilt axis, and the recess formed on the tip side is engaged with a pin (not shown) protruding from the support arm 752. When the tilt mechanism portion 75 operates, the support arm 752 rotates with respect to the tilt axis around the central axis of the tilt axis, and the rotation angle of the support arm 752 with respect to the tilt axis changes. Then, the tilt movement amount detection arm 52 whose tip side is engaged with the support arm 752 also rotates around the central axis of the tilt axis, and the rotation angle of the tilt movement amount detection arm 52 with respect to the tilt movement amount detector main body 51 also changes. In the second embodiment, when detecting the tilt movement amount of the working portion 74, first, the rotation angle of the tilt movement amount detection arm 52 with respect to the tilt movement amount detector main body 51 is detected by the tilt movement amount detector main body 51. Then, based on the detected rotation angle, the control means in the control box 3 performs arithmetic processing to calculate the tilt movement amount of the working portion 14.

[0081] Note that the tilt movement amount detector main body 51 may be configured using a known angle sensor such as a potentiometer or a rotary encoder. Further, the tilt movement detector 5 only needs to be able to detect the relative rotation angle between the tilt axis and the support arm 752, and it is also possible to configure the tilt movement detector 5 without providing the tilt movement detection arm 52. In the case of such a tilt movement detector 5, an attachment portion may be provided on a member (for example, the support arm 752) that rotates with respect to the tilt axis, the tilt movement detector body 51 serving as a sensor may be attached, and the rotating portion of the sensor may be fixed to the tilt axis. Alternatively, an attachment portion may be provided on the tilt axis, the tilt movement detector body 51 may be attached, and the rotating portion of the sensor may be fixed to a member (for example, the support arm 752) that rotates with respect to the tilt axis. Also, the detection of the tilt movement amount can be performed by providing a sensor that detects the expansion and contraction amount of the tilt cylinder 753 and detecting the expansion and contraction amount of the tilt cylinder 153 with this sensor.

[0082] [Movement amount display] Also in the second embodiment, in the same figure as the figure for explaining the display content when the offset state and tilt state of the lawn mower 1 shown in FIG. 9 are displayed on the display screen, similar to the first embodiment, the offset state and tilt state are displayed. That is, similar to the first embodiment, in the control means of the traveling vehicle body 2 as shown in FIG. 9, a figure is stored in association with the detection values by the offset movement detector 4 and the tilt movement detector 5, and a figure corresponding to the detection values by the offset movement detector 4 and the tilt movement detector 5 is displayed. The detection results detected by the offset movement detector 4 and the tilt movement detector 5 are transmitted to the control means in the control box 3. The control means calculates the offset movement amount and the tilt movement amount based on the transmitted detection results. The calculated offset movement amount and tilt movement amount are used for various controls of the lawn mower 1 and are also transmitted to the control means of the traveling vehicle body 2. The control means of the traveling vehicle body 2 also stores a program (tilt amount display program) for displaying the offset movement amount and the tilt movement amount on the display device provided on the traveling vehicle body 2 based on the offset movement amount and the tilt movement amount transmitted from the control means in the control box 3. If the tilt amount display program is stored in a portable terminal such as a PC, a tablet, or a smartphone, the offset movement amount and the tilt movement amount calculated in the control box 3 can be transmitted to the portable terminal such as a PC, a tablet, or a smartphone, and the offset movement amount and the tilt movement amount can be displayed on the display unit (display device) of the portable terminal such as a PC, a tablet, or a smartphone.

[0083] Note that the detection result transmitted to the control means in the control box 3 may be directly transmitted to the control means of the traveling vehicle body 2. In this case, the control means of the traveling vehicle body 2 calculates the offset movement amount and the tilt movement amount, and stores a program for displaying the offset movement amount and the tilt movement amount calculated by the control means of the traveling vehicle body 2 on the display device provided on the traveling vehicle body 2. Similarly, if the offset movement amount and the tilt movement amount are calculated by a portable terminal such as a PC, a tablet, or a smartphone, and a program for displaying the offset movement amount and the tilt movement amount is stored on the portable terminal such as a PC, a tablet, or a smartphone based on the calculation result, the detection result transmitted to the control means in the control box 3 can be directly transmitted to the portable terminal such as a PC, a tablet, or a smartphone, and the offset movement amount and the tilt movement amount can be displayed on the display unit of the portable terminal such as a PC, a tablet, or a smartphone. Also, in the second embodiment as well, similar to the first embodiment, by illustrating the offset movement amount and the tilt movement amount on the display device provided on the traveling vehicle body 2, the operator can monitor and easily grasp the offset movement amount and the tilt movement amount without looking back, and based on the monitoring result, operate a joystick (not shown) serving as an operating device of the lawn mower 7 to bring the working unit 74 into a desired state.

[0084] [Tilt movement amount display gauge] Figures 10, 11, 12, and 13 respectively show enlarged views of the tilt movement amount display gauge 6 provided at the front portion of the offset mechanism connecting portion 745. In the second embodiment, in addition to displaying the offset movement amount and the tilt movement amount by a display device provided on the traveling vehicle body 2, a tilt movement amount display gauge 6 capable of displaying the tilt movement amount is provided on the mower 7. The tilt movement amount display gauge 6 has a tilt movement amount scale 61 and a tilt movement amount display pointer 62. The tilt movement amount scale 61 is formed on the front portion of the outer peripheral surface of the offset mechanism connecting portion 745. The outer peripheral surface of the offset mechanism connecting portion 745 on which the tilt movement amount scale 61 is formed is formed in a cylindrical surface shape concentric with the tilt axis. The tilt movement amount display pointer 62 is formed on the rear end side of the outer peripheral surface of a cylindrical tilt movement amount detector cover 53 provided so as to cover the tilt movement amount detector 5. This tilt movement amount detector cover 53 is fixed to the support frame 723 of the offset mechanism portion 72. Further, the tilt movement amount detector cover 53 is formed in a cylindrical shape concentric with the tilt axis. The outer peripheral surface of the offset mechanism connecting portion 745 on which the tilt movement amount scale 61 is formed and the outer peripheral surface of the tilt movement amount detector cover 53 on which the tilt movement amount display pointer 62 is formed are configured to be substantially flush.

[0085] As described above, when the tilt mechanism portion 75 operates, the rotation angle of the support frame 723 with respect to the tilt axis changes. Therefore, the offset mechanism connecting portion 745 connected to the tilt axis and the tilt movement amount detector cover 53 attached to the support frame 723 rotate relative to each other. The tilt movement amount display pointer 62 formed on the tilt movement amount detector cover 53 rotates with respect to the tilt movement amount scale 61 formed on the offset mechanism connecting portion 745 and indicates the tilt movement amount scale 61 corresponding to the tilt movement amount. As shown in FIG. 11, when the working unit 74 is in a horizontal state, the tilt movement amount display pointer 62 points to the central tilt movement amount scale 61. When the working unit 74 tilts upward, the tilt movement amount display pointer 62 rotates counterclockwise (when viewed from the rear). As shown in FIG. 12, when the working unit 74 tilts upward most, that is, in the maximum upward tilt state, the tilt movement amount display pointer 62 points to the right-end tilt movement amount scale 61. On the other hand, when the working unit 74 tilts downward, the tilt movement amount display pointer 62 rotates clockwise (when viewed from the rear). As shown in FIG. 13, when the working unit 74 tilts downward most, that is, in the maximum downward tilt state, the tilt movement amount display pointer 62 points to the left-end tilt movement amount scale 61.

[0086] Note that the central tilt movement amount scale 61 corresponding to the horizontal state of the working unit 74 is preferably different from the tilt movement amount scale 61 indicated when the working unit 74 is rotating (tilting) (for example, the length of the scale line is longer, and the color of the scale line is different). Thereby, the operator can accurately grasp whether the working unit 74 is in a horizontal state. Further, in the present embodiment, the offset mechanism connecting portion 745 provided with the tilt movement amount scale 61 is configured in a cylindrical shape, but it is not necessary to be limited to this shape, and it can be appropriately changed as long as it can cover the tilt axis. For example, the portion provided with the tilt movement amount scale 61 may be configured in an arc shape when viewed from the front (including a semi-circular shape or a spherical shape including a hemispherical shape for the portion provided with the tilt movement amount scale 61), a polygonal shape, or the like. Further, the shape of the tilt movement amount detector cover 53 is not limited to a specific shape, and can be appropriately changed according to the shape of the offset mechanism connecting portion 745. Since the tilt movement amount display gauge 6 is provided on the upper part of the rotor cover 742 of the working unit 74, it can be easily visually recognized from the driver's seat. Note that the tilt movement amount scale 61 may be formed on the outer peripheral surface of the tilt movement amount detector cover 53, and the tilt movement amount display pointer 62 may be formed on the outer peripheral surface of the offset mechanism connecting portion 745, respectively. Although the tilt movement amount is detected by the tilt movement amount detector 5 and the detection result is displayed on a display device or the like, particularly when working with the working unit 74 offset to the right, the operator may work while checking the right rear in order to confirm the finish of mowing and the location where mowing is to be performed. At this time, it becomes possible to check the tilt movement amount using the tilt movement amount display gauge 6.

[0087] [Offset Movement Amount Display Gauge] In the second embodiment as well, an offset movement amount display gauge for displaying the offset movement amount of the working unit 74 may be provided. The offset movement amount display gauge is preferably provided at the mounting portion 71 close to the driver's seat so as to facilitate visual recognition from the driver's seat. Due to the offset movement of the working unit 74, the offset mechanism unit 72 and the power transmission unit 73 rotate with respect to the mounting portion 71. The offset movement amount display gauge may be configured to detect and display this rotational movement amount. The offset movement amount display gauge has an offset movement amount scale and an offset movement amount display pointer. If one of the offset movement amount scale and the offset movement amount display pointer is formed on the hitch frame 711 of the mounting portion 71 and the other is formed on the offset frame 721, link rod 722 or offset cylinder 724 of the offset mechanism unit 72 or the drive shaft 733 of the power transmission unit 73, the driver's seat can be easily visually recognized.

[0088] In the second embodiment, for tilt movement, both the tilt movement amount detector 5 and the tilt movement amount display gauge 6 are provided, but only one of them may be provided. Also, for offset movement, instead of providing the offset movement amount detector 4, only the offset movement amount display gauge may be provided. Also, it is not necessary to provide a movement amount detector or a movement amount display gauge for both tilt movement and offset movement, and a movement amount detector or a movement amount display gauge may be provided only for tilt movement or only for offset movement.

[0089] In the above-described Embodiment 1 and Embodiment 2, a lawn mower has been described as an example of an agricultural working machine. However, as the agricultural working machine, any machine may be used as long as it enables offset movement or tilt movement, or enables the movement of the agricultural working machine or a part thereof. For example, a ridger that performs offset movement, a harrow or a rotary tiller that performs tilt movement, and the like can be mentioned. In an agricultural working machine such as a harrow or a rotary tiller that can only perform tilt movement, for detecting the tilt movement amount, a detector or a display gauge for detecting the relative rotation amount between the mounting portion and the working portion may be used.

[0090] As described above, the lawn mower 1 of Embodiment 1 and the lawn mower 7 of Embodiment 2 according to the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these Embodiment 1 and Embodiment 2, and even if there are design changes or the like within the scope that does not depart from the gist of the present invention, they are included in the present invention. In addition, in the above-described Embodiment 1 and Embodiment 2, as long as there are no particular contradictions or problems in their purposes and configurations, etc., it is possible to divert and combine the technologies of each other.

Explanation of Reference Numerals

[0091] 1 Lawn mower 11 Mounting portion 111 Hitch frame 1111 Top link connection portion 1112 Lower link connection portion 112 Gear box 113 Lawn mower input shaft 12 Offset mechanism portion 121 Offset frame 122 Link rod 122a Pin 123 Support frame 124 Offset cylinder 13 Power transmission portion 131 Power transmission case 132 Front gear case 14 Working portion 141 Working rotor 141a Rotating shaft 141b Bracket 141c Grass cutting blade 142 Rotor cover 143 Side plate 144 Blade drive part 145 Rear gear case 146 Cylinder mounting part for tilt 147 Gauge roller 147a Arm 147b Roller body 147c Scraper member 15 Tilt mechanism part 151 Tilt shaft 151a Tilt shaft cover 152 Support arm 153 Cylinder for tilt 154 Tilt shaft bracket 154a Pin 2 Traveling vehicle body 21 Rear tire 3 Control box 4 Offset movement amount detector 41 Offset movement amount detector body 42 Offset movement amount detection arm 43 Offset movement amount detector cover 5 Tilt movement amount detector 51 Tilt movement amount detector body 52 Tilt movement amount detection arm 53 Tilt movement amount detector cover 6 Tilt movement amount display gauge 61 Tilt movement amount display scale 62 Tilt movement amount display pointer 7 Grass cutter 71 Mounting part 711 Hitch frame 7111 Top link connection part 7112 Lower link connection part 712 Gear box 713 Grass cutter input shaft 72 Offset mechanism part 721 Offset frame 721a Pin 722 Link rod 723 Support Frame 724 Offset Cylinder 73 Power Transmission Unit 731 Universal Joint 732 Universal Joint 733 Drive Shaft 74 Working Unit 741 Working Rotor 741a Rotating Shaft 742 Rotor Cover 743 Side Plate 744 Blade Drive Unit 745 Offset Mechanism Connecting Part 746 Tilt Cylinder Mounting Part 747 Gauge Roller 747a Arm 747b Roller Body 75 Tilt Mechanism Unit 752 Support Arm 753 Tilt Cylinder

Claims

1. An agricultural work machine having a mounting portion mounted on a traveling vehicle body and a working portion connected to the mounting portion, comprising a tilt mechanism portion capable of tilting and moving the working portion around a rotation axis parallel to the traveling direction of the traveling vehicle body, wherein the tilt mechanism portion is provided with detection means for detecting the tilt movement amount of the working portion. The agricultural work machine is characterized by this.

2. The mounting portion and the working portion are connected by an offset mechanism portion capable of offsetting and moving the working portion in a direction substantially orthogonal to the traveling direction of the traveling vehicle body and in a substantially horizontal direction with respect to the mounting portion, wherein the tilt mechanism portion can tilt and move the working portion with respect to the offset mechanism portion. The agricultural work machine according to Claim 1 is characterized by this.

3. The offset mechanism portion is provided with detection means for detecting the offset movement amount of the working portion. The agricultural work machine according to Claim 2 is characterized by this.

4. An agricultural work machine having a mounting portion mounted on a traveling vehicle body and a working portion connected to the mounting portion, comprising a tilt mechanism portion capable of tilting and moving the working portion around a rotation axis parallel to the traveling direction of the traveling vehicle body, wherein the tilt mechanism portion is provided with a display gauge capable of visually recognizing the tilt movement amount of the working portion. The agricultural work machine is characterized by this.

5. The mounting portion and the working portion are connected by an offset mechanism portion capable of offsetting and moving the working portion in a direction substantially orthogonal to the traveling direction of the traveling vehicle body and in a substantially horizontal direction with respect to the mounting portion, wherein the tilt mechanism portion can tilt and move the working portion with respect to the offset mechanism portion. The agricultural work machine according to Claim 4 is characterized by this.

6. The offset mechanism portion is provided with detection means for detecting the offset movement amount of the working portion. The agricultural work machine according to Claim 5 is characterized by this.

7. A display device for displaying the tilt movement amount and / or the offset movement amount of the working portion based on the tilt movement amount and / or the offset movement amount of the working portion transmitted from the detection means for detecting the tilt movement amount of the working portion and / or the detection means for detecting the offset movement amount of the working portion of the agricultural work machine according to any one of Claims 1 to 3 and 6.

Images