Agricultural machine

Abstract

To provide an agricultural machine, when a working unit moves by an offset distance, having no or a little amount of change in a longitudinal movement of the working unit, the agricultural working machine, that is, having no or a little amount of change in a longitudinal distance between a traveling vehicle body and the working unit.SOLUTION: An agricultural machine comprises: a mounting unit being connectable to a traveling vehicle body; a working unit receiving power from the traveling vehicle body to execute predetermined work; and an offset mechanism for connecting the mounting unit and the working unit and moving the working unit in a horizontal direction, where the offset mechanism includes a first rotating frame whose lower end side is rotationally connected to the mounting unit, a second rotating frame whose upper end side is rotationally connected to an upper end side of the first rotating frame and whose lower end side is connected to the working unit, and a first extensible member for connecting the upper end side of the first rotating frame and the mounting unit.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an agricultural working machine, particularly an agricultural working machine capable of offsetting a working part to the outside of a traveling vehicle body such as a tractor.

Background Art

[0002] Conventionally, an agricultural working machine that can move (offset move) a working part from the rear to the outside of a tractor and can perform work outside the tractor, for example, an offset mower, is known. (Patent Document 1)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an offset mower as shown in Patent Document 1, a mounting part mounted on a connecting part such as a three-point link of a traveling vehicle body such as a tractor and a working part are connected by a parallel link arranged in the front-rear direction. By this parallel link, the working part is horizontally moved in the left-right direction, and the working part is offset-moved to the outside of the traveling vehicle body. In this offset movement by the parallel link, the working part moves in the left-right direction while rotating in the front-rear direction (in plan view). That is, when the working part is offset-moved, the distance between the working part and the traveling vehicle body in the front-rear direction changes, and the weight balance between the working machine and the traveling vehicle body also changes. In particular, when moving backward, the distance of the working part from the traveling vehicle body increases, and a force is applied such that the traveling vehicle body tilts in the front-rear direction (the front is lifted and the rear sinks), and there is a problem that the weight balance of the entire traveling vehicle body and the offset mower deteriorates.

[0005] Therefore, the present invention aims to solve the above problems and provides an agricultural working machine in which, when the working part is offset and moved, there is no or little change in the amount of movement of the working part in the front-rear direction, that is, an agricultural working machine in which there is no or little change in the distance between the traveling vehicle body and the working part in the front-rear direction.

Means for Solving the Problems

[0006] In order to solve such problems, the present invention comprises the following configuration. A mounting part connectable to the traveling vehicle body, A working part that receives power from the traveling vehicle body and performs a predetermined operation, An offset mechanism part that connects the mounting part and the working part and moves the working part in the left-right direction, The offset mechanism part includes A first rotating frame part whose lower end side is rotatably connected to the mounting part, A second rotating frame part whose upper end side is rotatably connected to the upper end side of the first rotating frame part and whose lower end side is connected to the working part, A first telescopic member that connects the upper end side of the first rotating frame part and the mounting part, An agricultural working machine characterized by having the above.

Effects of the Invention

[0007] In the agricultural working machine of the present invention, the mounting part and the working part are connected by an offset mechanism part having a first rotating frame part whose lower end side is rotatably connected to the mounting part, a second rotating frame part whose upper end side is rotatably connected to the upper end side of the first rotating frame and whose lower end side is connected to the working part, and a first telescopic member that connects the upper end side of the first rotating frame part and the mounting part. Thus, in the offset movement of the working part in the left-right direction, the amount of change in the movement of the working part in the front-rear direction can be eliminated or reduced.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 8

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Figure 10

Figure 11

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Figure 13

[0009] [First Embodiment] Hereinafter, the lawn mower A of the 1st Embodiment according to the present invention will be described with reference to the drawings. Note that the agricultural work machine is not limited to a lawn mower, and any machine that can be offset-moved may be used, for example, a ridge coater or the like. In the following description, the same reference numerals in different drawings denote parts having the same function, and duplicate 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 moves forward is forward, and the opposite is backward. Further, when facing forward, the right side is the rightward direction, and the left side is the leftward direction.

[0010] FIGS. 1, 2, and 3 are diagrams showing the configurations of the working unit 3 of the first embodiment in the stored state, the state during offset movement, and the maximum offset state, respectively. In each of these figures, the upper row shows, from left to right, a perspective view of the lawn mower A as seen from obliquely upper rear left, a view as seen from the front (front face), and a perspective view of the lawn mower A as seen from obliquely upper rear right; the middle row shows a plan view; and the lower row shows, from left to right, a left side view, a view as seen from the rear (back face), and a right side view.

[0011] [Overall Structure] The lawn mower A of the first embodiment is connected to a traveling vehicle body (not shown) and performs a lawn mowing operation while moving forward as the traveling vehicle body such as a tractor moves forward. The lawn mower A includes a mounting portion 1, an offset mechanism portion 2, and a working unit 3.

[0012] [Mounting Portion] The mounting portion 1 is connected to a three-point link mechanism (not shown) provided at the rear of the traveling vehicle body. 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.

[0013] The mounting portion 1 has a frame 11 including a connecting portion connected to the three-point link and a lawn mower power input shaft (not shown) to which power from the PTO shaft (not shown) of the traveling vehicle body is transmitted. Near the left and right centers of the frame 11, a first rotation frame lower end side support shaft 111 for rotatably connecting the first rotation frame 21 described later in the left and right directions is provided so as to protrude rearward. Inside the first rotation frame lower end side support shaft 111, a lawn mower power input shaft for inputting power to the lawn mower A is housed, and the first rotation frame lower end side support shaft 111 and the lawn mower power input shaft are arranged concentrically. At the lower right end of the frame 11, a first telescopic member lower end side support shaft 112 for rotatably connecting a first telescopic member 26 (to be described later) in the left - right direction is provided so as to protrude rearward. At the upper left end of the frame 11, a first support arm lower end side support shaft 113 for rotatably connecting a first support arm 24 (to be described later) in the left - right direction is provided so as to protrude rearward. Note that the mounting portion 1 may be connected to a three - point link mechanism of a traveling vehicle body via a known auto - hitch.

[0014] [Working portion] The working portion 3 includes grass - cutting claws and a claw shaft to which a plurality of grass - cutting claws are attached and which is rotationally driven by power from a working portion input shaft (to be described later), and has a working rotor (none of which are shown) for performing grass - cutting work. The working rotor is covered by a shield cover 32 and side plates 33 provided on both the left and right sides of the shield cover 32. A working portion transmission case 31 is provided outside the left - hand side plate 33. In the working portion transmission case 31, a second rotating frame lower end side support shaft 31a for rotatably connecting the lower end side of a second rotating frame 22 (to be described later) in the left - right direction is provided so as to protrude rearward. A working portion input shaft (not shown) is housed in the second rotating frame lower end side support shaft 31a. The working portion input shaft transmits power from the transmission means in the second rotating frame 22 (to be described later) to the claw shaft of the working rotor, and rotates the grass - cutting claws via the claw shaft. The shield cover 32 is configured in a sickle - like shape in a side view and covers the upper part of the working rotor. At the rear side of the shield cover 32 (in a plan view, the side rearward of the rotation center of the claw shaft), a second telescopic member support portion 34 for attaching a second telescopic member 27 (to be described later) protrudes.

[0015] [Offset mechanism portion] The offset mechanism unit 2 is a mechanism for offsetting the movement of the working unit 3, and includes a first rotating frame 21 and a first support arm 24 (first rotating frame part), a second rotating frame 22, a rotation support member 23 and a second support arm 25 (second rotating frame part), a first telescopic member 26, and a second telescopic member 27. In addition, in this specification, the offset mechanism unit 2 includes a mechanism for tilting the movement of the working unit 3 in addition to the mechanism for offsetting the movement of the working unit 3. The lower end side of the first rotating frame 21 is connected to a first rotating frame lower end side support shaft 111 provided near the left and right center of the mounting part 1 (frame 11) so as to be rotatable left and right. On the upper end side of the first rotating frame 21, a second rotating frame upper end side support shaft 211 for connecting the upper end side of the second rotating frame 22, which will be described later, so as to be rotatable left and right is provided so as to protrude rearward. Inside the second rotating frame upper end side support shaft 211, an intermediate transmission shaft (not shown) is housed, and the second rotating frame upper end side support shaft 211 and the intermediate transmission shaft are arranged concentrically. In addition, a second support arm upper end side support part 213 for connecting the second support arm 25, which will be described later, is fixed to the second rotating frame upper end side support shaft 211. The second support arm upper end side support part 213 is provided with two in the front-rear direction so that a second support arm upper end side support shaft 213a (not shown) for connecting the upper end of the second support arm 25 is inserted in the front-rear direction.

[0016] The first rotating frame 21 is configured to be hollow, and a first winding transmission means (power transmission means: not shown) is housed therein. The input shaft of the first winding transmission means is the lawn mower power input shaft of the mounting part 1, and the output shaft of the first winding transmission means is the intermediate transmission shaft in the second rotating frame upper end side support shaft 211. That is, a drive sprocket of the first winding transmission means is provided at an end portion located inside the first rotating frame 21 of the grass mower power input shaft, and a driven sprocket of the first winding transmission means is provided at an end portion located inside the first rotating frame 21 of the intermediate transmission shaft. A chain is wound around these drive sprocket and driven sprocket so as to transmit the power of the drive side sprocket (grass mower power input shaft) to the driven side sprocket (intermediate transmission shaft). In addition, in the present embodiment, the first winding transmission drive means is composed of a sprocket and a chain, but is not limited thereto, and it is also possible to configure it with a pulley and a belt or the like. At a position located on the upper end side of the right side surface of the first rotating frame 21, a first telescopic member upper end side support portion 212 connected to a first telescopic member 26 described later is provided so as to protrude to the right of the second rotating frame upper end side support shaft 211. The first telescopic member upper end side support portion 212 is formed in a substantially U shape so that a first telescopic member upper end side support shaft 212a (not shown) that rotatably connects the upper end, which is the cylinder side of the first telescopic member 26, in the left - right direction is inserted in the front - rear direction.

[0017] The upper end side of the second rotating frame 22 is rotatably connected to the second rotating frame upper end side support shaft 211 of the first rotating frame 21 in the left - right direction. The lower end side of the second rotating frame 22 is rotatably connected to a second rotating frame lower end side support shaft 31a provided so as to protrude rearward from the working portion transmission case 31 of the working portion 3 in the left - right direction. Inside the second rotating frame lower end side support shaft 31a, a working portion input shaft (not shown) is housed, and the second rotating frame lower end side support shaft 31a and the working portion input shaft are arranged concentrically.

[0018] The second rotating frame 22 is also configured to be hollow, similar to the first rotating frame 21, and a second winding transmission means (power transmission means: not shown) is housed therein. The input shaft of the second winding transmission means is an intermediate transmission shaft within the upper end side support shaft 211 of the second rotating frame, and the output shaft of the second winding transmission means is a working unit input shaft within the lower end side support shaft 31a of the second rotating frame. Note that the second winding transmission means is configured by, for example, a sprocket and a chain, similar to the first winding transmission means. That is, a drive sprocket of the second winding transmission means is provided at the end of the intermediate transmission shaft located inside the second rotating frame 22, and a driven sprocket of the second winding transmission means is provided at the end of the working unit input shaft located inside the second rotating frame 22. A chain is wound around these drive sprockets and driven sprockets so as to transmit the power of the drive side sprocket (intermediate transmission shaft) to the driven side sprocket (working unit input shaft). A first support arm upper end side support portion 221 provided with a first support arm upper end side support shaft 221a for supporting a first support arm 24 described later is rotatably connected to the front end portion of the upper end side support shaft 211 of the second rotating frame. The tip side of this first support arm upper end side support portion 221 is connected to the upper end side of the second rotating frame 22 by a second rotating frame connecting member 222. That is, the first support arm upper end side support portion 221 rotates integrally with the second rotating frame 22.

[0019] In the first embodiment, the first rotating frame 21 and the second rotating frame 22 not only have the function as a structural member of the lawn mower A but also have the function of housing the power transmission means, contributing to the compactification of the lawn mower A. Note that the first rotating frame 21 and the second rotating frame 22 may be configured such that the first winding transmission means and the second winding transmission means are not housed therein, and instead, a first transmission case and a second transmission case for housing the first winding transmission means and the second winding transmission means are provided side by side with the first rotating frame 21 and the second rotating frame 22, respectively.

[0020] A rotation support member 23 to which a second support arm 25 and a second telescopic member 27, which will be described later, are connected is rotatably supported on the lower end side support shaft 31a of the second rotating frame. The rotation support member 23 has a substantially C-shaped form. The bent portion of the C-shape is rotatably supported on the lower end side support shaft 31a of the second rotating frame. The lower end side of the second support arm 25 is rotatably connected to one end portion of the C-shape (left side in a rear view), and the rod side of the second telescopic member 27 is rotatably connected to the other end portion of the C-shape (right side in a rear view).

[0021] The lower end side of the first support arm 24 is connected to a first support arm lower end side support shaft 113 provided on the upper left end side of the frame 11 of the mounting portion 1 so as to be rotatable left and right. The upper end side of the first support arm 24 is connected to a first support arm upper end side support shaft 221a provided in the front-rear direction at the tip of a first support arm upper end side support portion 221 so as to be rotatable left and right, respectively. The upper end side of the second support arm 25 is connected to a second support arm upper end side support shaft 213a provided on a second support arm upper end side support portion 213 fixed to the second rotating frame upper end side support shaft 211 so as to be rotatable left and right. The lower end side of the second support arm 25 is connected to one end portion of the rotation support member 23 so as to be rotatable left and right. A curved portion 25a formed in a curved shape is provided on the upper end side of the second support arm 25 to prevent contact with other constituent members. When other constituent members are arranged in the movement locus of the second support arm 25, contact with other constituent members can be prevented by making a part of the second support arm 25 into the curved portion 25a.

[0022] The lower end side of the first telescopic member 26, which is the rod side, is connected to the lower end side support shaft 112 of the frame 11 so as to be rotatable left and right. Further, the upper end side of the first telescopic member 26, which is the cylinder side, is inserted into the upper end side support portion 212 of the first rotating frame 21 provided on the first rotating frame 21, and more specifically, is inserted into the upper end side support portion 212 of the first telescopic member, and is provided in the front-rear direction. It is connected to the upper end side support shaft 212a of the first telescopic member so as to be rotatable left and right. This first telescopic member 26 is used when the working portion 3 is offset and moved. One end of the second telescopic member 27, which is the rod side, is rotatably connected to the other end of the rotation support member 23. Further, the other end of the second telescopic member 27, which is the cylinder side, is connected to the second telescopic member support portion 34 provided on the shield cover 32 of the working portion 3. This second telescopic member 27 is used when the working portion 3 is tilted and moved. In the first embodiment, the first telescopic member 26 and the second telescopic member 27 use an electro-hydraulic cylinder, but other telescopic members such as an electric cylinder and a hydraulic cylinder may be used.

[0023] In the first embodiment, as described above, the second rotating frame 22 is connected to the rear of the first rotating frame 21, and the working portion 3 is connected to the front of the second rotating frame 22, and the working portion 3 is disposed below the mounting portion 1. With this arrangement, the working portion 3 is positioned closer to the traveling vehicle body, and it is possible to prevent the weight balance of the traveling vehicle body from deteriorating.

[0024] [Offset movement] FIG. 4 is a view showing the offset movement of the lawn mower A according to the first embodiment of the present invention. (a) is a stored state of the working portion 3, (b) is a state during the offset movement of the working portion 3, and (c) is a view of the maximum offset state of the working portion 3. Each of the upper stages is a plan view, and the lower stages are views seen from the rear. As described above, the offset mechanism unit 2 connects and supports the working unit 3 to the mounting unit 1 by connecting the first rotating frame 21 upward to the mounting unit 1, connecting the second rotating frame 22 downward to the upper end side of the first rotating frame 21, and connecting the working unit 3 to the lower end side of the second rotating frame 22. Furthermore, the first support arm 24 connects the mounting unit 1 and the upper end side of the second rotating frame 22, and the second support arm 25 connects the upper end side of the first rotating frame 21 and the working unit 3, respectively.

[0025] In the above-described offset mechanism unit 2, the working unit 3 is offset and moved in the left-right direction by expanding and contracting the first expansion and contraction member 26. In the first embodiment, as shown in FIG. 4(a), in the stored state where the working unit 3 is located behind the traveling vehicle body, the first expansion and contraction member 26 is in the most extended state. When the first expansion and contraction member 26 is contracted from the state shown in FIG. 4(a), as shown in FIG. 4(b), the working unit 3 is offset and moved to the side of the traveling vehicle body. Further, when the first expansion and contraction member 26 is contracted, as shown in FIG. 4(c), the first expansion and contraction member 26 is in the most contracted state, and the maximum offset state where the offset amount is maximized is reached. In the first embodiment 1, the working unit 3 can perform the grass cutting operation in any state between the stored state as shown in FIG. 4(a) and the maximum offset state as shown in FIG. 4(c). In the offset mechanism unit 2 of the first embodiment, the first rotating frame 21, the second rotating frame 22, the first support arm 24, and the second support arm 25 are arranged in the vertical direction, and the rotating shafts that connect these to be rotatable with each other are arranged parallel to the front-rear direction (traveling direction). Therefore, when the working unit 3 is offset and moved, as shown in the upper figure of FIG. 4, the working unit 3 does not move in the front-rear direction. In the upper figure of FIG. 4, it can be read that the frame 11 is immovable in the offset movement, and the position of the rear end of the working unit 3 moves along a dotted line parallel to the dotted line connecting the frames 11 in FIGS. 4(a), 4(b), and 4(c). With the configuration that allows offset movement without forward and backward movement, during offset movement, the front-back balance of the load applied to the traveling vehicle body does not change, and stable offset movement can be performed.

[0026] Furthermore, as shown in the lower diagram of Fig. 4, when the working unit 3 of the first embodiment performs offset movement, it moves almost horizontally while maintaining an almost horizontal state and hardly moves in the vertical direction. In the lower diagram of Fig. 4, the lower end side support shaft 111 of the first rotating frame remains stationary during offset movement, and it can be seen that the position of the lower end of the working unit 3 moves almost along a dotted line parallel to the dotted line connecting the lower end side support shaft 111 of the first rotating frame in Figs. 4(a), 4(b), and 4(c).

[0027] Hereinafter, the offset movement in the first embodiment will be described in detail. First, the displacement from the stored state in Fig. 4(a) to the state during offset movement in Fig. 4(b) will be described. From the state of Fig. 4(a), as the first telescopic member 26 contracts, the upper end side support portion 212 of the first telescopic member is pulled by the first telescopic member 26, and with the lower end side support shaft 111 of the first rotating frame of the mounting portion 1 as the rotation center axis, the upper end side of the first rotating frame 21 rotates to the right. As the upper end side of the first rotating frame 21 rotates to the right with the lower end side support shaft 111 of the first rotating frame as the rotation center axis, the upper end side support shaft 211 of the second rotating frame provided on the first rotating frame 21 also moves to the right with the lower end side support shaft 111 of the first rotating frame as the rotation center axis. Similarly, the upper end side support portion 213 of the second support arm and the upper end side support shaft 213a of the second support arm provided on the upper end side support shaft 211 of the second rotating frame also move to the right with the lower end side support shaft 111 of the first rotating frame as the rotation center axis. The first support arm upper end side support shaft 221a provided on the first support arm upper end side support portion 221 also moves rightward with the first rotation frame lower end side support shaft 111 as the rotation center axis. However, the second rotation frame 22 is pulled by the upper end side of the first support arm 24 that rotates rightward with the first support arm lower end side support shaft 113 as the rotation center axis, and the lower end side of the second rotation frame 22 rotates rightward with the second rotation frame upper end side support shaft 211 as the rotation center axis. As the lower end side of the second rotation frame 22 rotates rightward with the second rotation frame upper end side support shaft 211 as the rotation center axis, the lower end side of the second support arm 25 is pulled by the rotation support member 23, and the lower end side of the second support arm 25 rotates rightward with the second support arm upper end side support shaft 213a as the rotation center axis. In this way, due to the link mechanism of the second support arm upper end side support portion 213, the second rotation frame 22, the second support arm 25, and the rotation support member 23, the working portion 3 (rotation support member 23) moves rightward while maintaining a substantially horizontal state without rotating with respect to the ground.

[0028] Furthermore, when the first telescopic member 26 contracts, the upper end side of the first rotation frame 21 rotates rightward with the first rotation frame lower end side support shaft 111 as the rotation center axis, so the second rotation frame upper end side support shaft 211 moves upward with respect to the first rotation frame lower end side support shaft 111. On the other hand, since the lower end side of the second rotation frame 22 rotates rightward with the second rotation frame upper end side support shaft 211 as the rotation center axis, the second rotation frame lower end side support shaft 31a provided on the working portion transmission case 31 of the working portion 3 moves downward with respect to the second rotation frame upper end side support shaft 211. In the lawn mower A of this embodiment, the upward movement amount (displacement amount in the height direction) of the second rotation frame upper end side support shaft 211 with respect to the first rotation frame lower end side support shaft 111 caused by the contraction of the first telescopic member 26 and the downward movement amount (displacement amount in the height direction) of the second rotation frame lower end side support shaft 31a with respect to the second rotation frame upper end side support shaft 211 are designed to be substantially the same movement amount. Therefore, the working portion 3 (rotation support member 23) hardly moves up and down and moves substantially in the horizontal direction.

[0029] Next, the displacement from the state diagram during the offset movement in Fig. 4(b) to the maximum offset state in Fig. 4(c) will be described. From the state of Fig. 4(b), as the first telescopic member 26 further contracts, the upper end side support portion 212 of the first telescopic member is pulled by the first telescopic member 26, and with the lower end side support shaft 111 of the first rotation frame of the mounting portion 1 as the rotation center axis, the upper end side of the first rotation frame 21 rotates further to the right. As the upper end side of the first rotation frame 21 rotates to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis, the upper end side support shaft 211 of the second rotation frame provided on the first rotation frame 21 also moves to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis. Similarly, the upper end side support portion 213 of the second support arm and the upper end side support shaft 213a of the second support arm provided on the upper end side support shaft 211 of the second rotation frame also move to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis. The upper end side support shaft 221a of the first support arm provided on the upper end side support portion 221 of the first support arm also moves to the right in the same manner with the lower end side support shaft 111 of the first rotation frame as the rotation center axis. However, the second rotation frame 22 is pulled by the upper end side of the first support arm 24 that rotates to the right with the lower end side support shaft 113 of the first support arm as the rotation center axis, and the lower end side of the second rotation frame 22 rotates further to the right with the upper end side support shaft 211 of the second rotation frame as the rotation center axis. As the lower end side of the second rotation frame 22 rotates to the right with the upper end side support shaft 211 of the second rotation frame as the rotation center axis, the lower end side of the second support arm 25 is pulled by the rotation support member 23, and the lower end of the second support arm 25 rotates to the right with the upper end side support shaft 213a of the second support arm as the rotation center axis. In this way, due to the link mechanism of the upper end side support portion 213 of the second support arm, the second rotation frame 22, the second support arm 25, and the rotation support member 23, the working portion 3 (rotation support member 23) moves to the right while maintaining a substantially horizontal state without rotating with respect to the ground.

[0030] Furthermore, when the first telescopic member 26 contracts, the first rotating frame 21 rotates with the lower end side support shaft 111 of the first rotating frame as the rotation center axis, and the upper end side thereof rotates to the right. Therefore, the upper end side support shaft 211 of the second rotating frame moves downward with respect to the lower end side support shaft 111 of the first rotating frame. On the other hand, with the upper end side support shaft 211 of the second rotating frame as the rotation center axis, the lower end side of the second rotating frame 22 rotates to the right. Therefore, the lower end side support shaft 31a of the second rotating frame provided on the working part transmission case 31 provided in the working part 3 moves upward with respect to the upper end side support shaft 211 of the second rotating frame. In the lawn mower A of the present embodiment, the downward movement amount (displacement amount in the height direction) of the upper end side support shaft 211 of the second rotating frame with respect to the lower end side support shaft 111 of the first rotating frame caused by the contraction of the first telescopic member 26 and the upward movement amount (displacement amount in the height direction) of the lower end side support shaft 31a of the second rotating frame with respect to the upper end side support shaft 211 of the second rotating frame are designed to be almost the same movement amount. Therefore, the working part 3 (rotating support member 23) hardly moves up and down and moves almost in the horizontal direction. It should be noted that the movement from the maximum offset state in Fig. 4(c) to the storage state in Fig. 4(a) is the reverse operation of the aforementioned offset movement.

[0031] In this way, in the lawn mower A of the first embodiment, by combining the rotating first rotating frame 21 and the rotating second rotating frame 22, when the first telescopic member 26 contracts and the working part 3 is offset-moved, the upward or downward movement of the working part 3 caused by the rotation of the first rotating frame 21 can be offset by the downward or upward movement of the working part 3 caused by the rotation of the second rotating frame 22. When the working part 3 is offset-moved, an offset movement in which it hardly moves up and down becomes possible. And in the lawn mower A of the first embodiment, the working part 3 can be offset-moved regardless of the position in the vertical direction (for example, even when the working part 3 is lowered near the ground). In the first embodiment, by only expanding and contracting the first expansion and contraction member 26, the working unit 3 can be offset-moved substantially horizontally while maintaining a substantially horizontal state without moving back and forth or substantially vertically. That is, without requiring a complicated configuration such as controlling a plurality of expansion and contraction members in cooperation, it is possible to achieve the effect that the working unit 3 can be offset-moved with a simple configuration without moving in the front-rear and up-down directions.

[0032] As described above, when the upper end side support shaft 211 of the second rotating frame, which is a rotating shaft for rotatably connecting the first rotating frame 21, the second rotating frame 22, the first support arm 24, and the second support arm 25, is parallel to the traveling direction, there is no movement of the working unit 3 in the front-rear direction. However, due to the relationship between the traveling vehicle body and the place where the mowing work is performed, etc., when the mower A is slightly lifted by the three-point link of the traveling vehicle body, etc., the entire mower A may be inclined in the front-rear direction. In this case, since the upper end side support shaft 211 of the second rotating frame is also inclined with respect to the traveling direction, when the working unit 3 is offset-moved, the working unit 3 moves slightly in the front-rear direction due to the fact that the working unit 3 moves slightly in the up-down direction when the upper end side support shaft 211 of the second rotating frame is parallel to the traveling direction. In the first embodiment, the working unit 3 is in the stored state when the first expansion and contraction member 26 is in the most extended state, and the working unit 3 is in the maximum offset state when the first expansion and contraction member 26 is in the most contracted state. However, the working unit 3 may be in the stored state when the first expansion and contraction member 26 is in the most contracted state, and the working unit 3 may be in the maximum offset state when the first expansion and contraction member 26 is in the most extended state.

[0033] [Tilt movement] FIG. 5 is a diagram showing the tilt movement of the mower A according to the first embodiment of the present invention, where (a) is a diagram of the state where the working unit 3 is tilted upward, and (b) is a diagram of the state where the working unit 3 is tilted downward. In the first embodiment, the offset mechanism unit 2 has a second expansion and contraction member 27 for tilting the working unit 3. The second expansion and contraction member 27 connects the rotation support member 23 and the second expansion and contraction member support portion 34 provided on the shield cover 32 of the working unit 3. In the offset mechanism unit 2, by expanding and contracting the second expansion and contraction member 27, the working unit 3 can be tilted in both the vertical upward and downward directions with the lower end side support shaft 31a of the second rotation frame as the rotation center axis. In the first embodiment, as shown in FIG. 5(a), with the second expansion and contraction member 27 contracted, the working unit 3 is in an upwardly tilted state, and as shown in FIG. 5(b), with the second expansion and contraction member 27 extended, the working unit 3 is in a downwardly tilted state. It should be noted that it is also possible to configure such that with the second expansion and contraction member 27 extended, the working unit 3 is in an upwardly tilted state, and with the second expansion and contraction member 27 contracted, the working unit 3 is in a downwardly tilted state.

[0034] [Modification Example 1] FIG. 6 is a view showing a part of the lawn mower A of Modification Example 1 of the present invention, where (a) shows the upward tilt state of the working unit 3 and (b) shows the downward tilt state of the working unit 3. Note that in FIG. 6, some members are simplified for easier understanding of the tilt movement. In Modification Example 1, the rotation support member 23 and the connection structure between the rotation support member 23 and the second expansion and contraction member 27 of the first embodiment are different. The structure of Modification Example 1 other than the structure different from that of the first embodiment is all the same as the structure of the first embodiment. The rotation support member 23a (a part of the first rotation frame portion) has an arm shape, one end of which is rotatably connected to the lower end side support shaft 31a of the second rotation frame of the working unit 3, and the other end is rotatably connected to the lower end side of the second support arm 25. Note that the shape of the rotation support member 23a is not limited to an arm shape and may be other shapes. A link mechanism 23b is interposed between the rotation support member 23a and the second expansion and contraction member 27.

[0035] The link mechanism 23b is composed of two link arms, a first link arm 23b1 and a second link arm 23b2. One end of the first link arm 23b1 is rotatably connected to the connection point between the rotation support member 23a and the second support arm 25, and the other end is rotatably connected to one end of the second link arm 23b2. The second link arm 23b2 is formed in a substantially U-shape that is bent in a rear view, and the other end of the second link arm 23b2 that is not connected to the first link arm 23b1 is rotatably connected to a link mechanism support portion 35 provided on the shield cover 32 of the working portion 3. Note that the shape of the second link arm 23b2 is not limited to a substantially U-shape, and other shapes may be used. These rotation support member 23a, the first link arm 23b1, and the second link arm 23b2 constitute a four-bar link. One end of the second telescopic member 27 is rotatably connected to the connection point between the first link arm 23b1 and the second link arm 23b2, and the other end is rotatably connected to a second telescopic member support portion 34 provided on the shield cover 32 of the working portion 3. In the first modification, since the second telescopic member 27 is connected to the rotation support member 23a via the link mechanism 23b, even if the working portion 3 moves in the tilt direction due to vibration or the like, it is possible to suppress the influence from being transmitted to the rotation support member 23 side.

[0036] [Second Modification] FIG. 7 is a view showing a part of the lawn mower A according to the second modification of the present invention, where (a) shows the stored state of the working portion 3, (b) shows the state during the offset movement of the working portion 3, (c) shows the maximum offset state of the working portion 3, (d) shows the tilted state upward of the working portion 3, and (e) shows the tilted state downward of the working portion 3. Note that FIG. 7 simplifies some members for easy understanding of the offset movement and the tilt movement. Modification Example 2 is different from the first embodiment in that a third telescopic member 28 (a part of the second rotating frame portion) is provided in place of the rotating support member 23, the second support arm 25, and the second telescopic member 27 of the first embodiment. The structure of Modification Example 2 other than the structure different from the structure of the first embodiment is all the same as the structure of the first embodiment. This third telescopic member 28 is used when tilting and moving the working portion 3 and is also used as a part of the link mechanism when performing offset movement. For the third telescopic member 28, the upper end on the cylinder side is inserted into a third telescopic member upper end side support portion 214 fixed to the second rotating frame upper end side support shaft 211, and is connected to a third telescopic member upper end side support shaft 214a extending in the front-rear direction so as to be rotatable left and right. Further, the lower end on the rod side is connected to a third telescopic member lower end side support shaft 36a inserted in the longitudinal direction into a long hole 36b provided in a third telescopic member lower end side support portion 36 of the working portion 3 so as to be rotatable left and right. As shown in FIGS. 7(a) to 7(c), when the first telescopic member 26 is telescoped, the working portion 3 moves in an offset manner.

[0037] Hereinafter, the offset movement in Modification Example 2 will be described in detail. First, the displacement from the stored state in FIG. 7(a) to the state during offset movement in FIG. 7(b) will be described. From the state of FIG. 7(a), as the first telescopic member 26 contracts, the first telescopic member upper end side support shaft 212a is pulled by the first telescopic member 26, and with the first rotating frame lower end side support shaft 111 of the mounting portion 1 as the rotation center axis, the upper end side of the first rotating frame 21 rotates to the right. As the upper end side of the first rotating frame 21 rotates to the right with the first rotating frame lower end side support shaft 111 as the rotation center axis, the second rotating frame upper end side support shaft 211 provided on the first rotating frame 21 moves to the right with the first rotating frame lower end side support shaft 111 as the rotation center axis. Similarly, the third telescopic member upper end side support portion 214 and the third telescopic member upper end side support shaft 214a provided on the second rotating frame upper end side support shaft 211 also move to the right with the first rotating frame lower end side support shaft 111 as the rotation center axis. The first support arm upper end side support shaft 221a provided on the first support arm upper end side support portion 221 also moves to the right with the first rotation frame lower end side support shaft 111 as the rotation center axis. However, the second rotation frame 22 is pulled by the upper end side of the first support arm 24 that rotates to the right with the first support arm lower end side support shaft 113 as the rotation center axis, and the lower end side of the second rotation frame 22 rotates to the right with the second rotation frame upper end side support shaft 211 as the rotation center axis. In this way, due to the link mechanism of the second rotation frame 22, the third telescopic member upper end side support portion 214, the third telescopic member 28, and the working portion 3, the working portion 3 moves to the right while maintaining a substantially horizontal state without rotating with respect to the ground.

[0038] Furthermore, when the first telescopic member 26 contracts, the upper end side of the first rotation frame 21 rotates to the right with the first rotation frame lower end side support shaft 111 as the rotation center axis. Therefore, the second rotation frame upper end side support shaft 211 moves upward with respect to the first rotation frame lower end side support shaft 111. On the other hand, since the lower end side of the second rotation frame 22 rotates to the right with the second rotation frame upper end side support shaft 211 as the rotation center axis, the second rotation frame lower end side support shaft 31a provided on the working portion transmission case 31 of the working portion 3 moves downward with respect to the second rotation frame upper end side support shaft 211. And in the lawn mower A of this modification 2, the upward movement amount (displacement amount in the height direction) of the second rotation frame upper end side support shaft 211 with respect to the first rotation frame lower end side support shaft 111 caused by the contraction of the first telescopic member 26 and the downward movement amount (displacement amount in the height direction) of the second rotation frame lower end side support shaft 31a with respect to the second rotation frame upper end side support shaft 211 are designed to be substantially the same movement amount. Therefore, the working portion 3 hardly moves up and down and moves substantially in the horizontal direction.

[0039] Next, the displacement from the state diagram during offset movement in Fig. 7(b) to the maximum offset state in Fig. 7(c) will be described. From the state of Fig. 7(b), as the first telescopic member 26 further contracts, the upper end side support portion 212 of the first telescopic member is pulled by the first telescopic member 26, and with the lower end side support shaft 111 of the first rotation frame of the mounting portion 1 as the rotation center axis, the upper end side of the first rotation frame 21 rotates further to the right. As the upper end side of the first rotation frame 21 rotates to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis, the upper end side support shaft 211 of the second rotation frame provided on the first rotation frame 21 moves to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis. Similarly, the upper end side support portion 214 of the third telescopic member and the upper end side support shaft 214a of the third telescopic member provided on the upper end side support shaft 211 of the second rotation frame also move to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis. The upper end side support shaft 221a provided on the upper end side support portion 221 of the first support arm also moves to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis. However, the second rotation frame 22 is pulled by the upper end side of the first support arm 24 that rotates to the right with the lower end side support shaft 113 of the first support arm as the rotation center axis, and with the upper end side support shaft 211 of the second rotation frame as the rotation center axis, the lower end side of the second rotation frame 22 rotates further to the right. In this way, due to the link mechanism of the second rotation frame 22, the upper end side support portion 214 of the third telescopic member, the third telescopic member 28, and the working portion 3, the working portion 3 moves to the right while maintaining a substantially horizontal state without rotating with respect to the ground.

[0040] Furthermore, when the first telescopic member 26 contracts, the first rotation frame 21 rotates its upper end side to the right with the lower end side support shaft 111 of the first rotation frame as the rotation center axis. Therefore, the upper end side support shaft 211 of the second rotation frame moves downward with respect to the lower end side support shaft 111 of the first rotation frame. Also, since the lower end side of the second rotation frame 22 rotates to the right with the upper end side support shaft 211 of the second rotation frame as the rotation center axis, the lower end side support shaft 31a provided on the working portion transmission case 31 provided on the working portion 3 moves upward with respect to the upper end side support shaft 211 of the second rotation frame. And in the lawn mower A of the second modification, the downward movement amount (displacement amount in the height direction) of the upper end side support shaft 211 of the second swing frame with respect to the lower end side support shaft 111 of the first swing frame caused by the contraction of the first telescopic member 26 and the upward movement amount (displacement amount in the height direction) of the lower end side support shaft 31a of the second swing frame with respect to the upper end side support shaft 211 of the second swing frame are designed to be substantially the same movement amount. Therefore, the working part 3 hardly moves up and down and moves substantially in the horizontal direction. Note that the movement from the maximum offset state in Fig. 7(c) to the storage state in Fig. 7(a) is the reverse operation of the aforementioned offset movement.

[0041] As described above, due to the configuration that enables offset movement without vertical movement, in the lawn mower A of the second modification, the working part 3 can be offset-moved regardless of its position in the vertical direction (for example, even when the working part 3 is lowered near the ground). Also, in the second modification, by only expanding and contracting the first telescopic member 26, the working part 3 can be offset-moved substantially in the horizontal direction while maintaining a substantially horizontal state without moving back and forth or up and down. That is, without requiring a complicated configuration such as controlling a plurality of telescopic members in cooperation, with a simple configuration, the effect that the working part 3 can be offset-moved without moving back and forth or up and down can be achieved.

[0042] Note that in the second modification, the working part 3 is in the storage state when the first telescopic member 26 is in the most extended state, and the working part 3 is in the maximum offset state when the first telescopic member 26 is in the most contracted state. However, it may be arranged such that the working part 3 is in the storage state when the first telescopic member 26 is in the most contracted state, and the working part 3 is in the maximum offset state when the first telescopic member 26 is in the most extended state.

[0043] Also, as shown in Figs. 7(d) to (e), when the third telescopic member 28 is expanded and contracted, the working part 3 tilts and moves in the same manner as in the first embodiment. In Modification 2, by connecting the third telescopic member 28 and the working part 3 through the long hole of the third telescopic member lower end side support part 36, even if the working part 3 moves in the tilt direction due to vibration or the like, it is possible to suppress the transmission of the influence to the third telescopic member 28 side.

[0044] [Modification 3] FIG. 8 is a view showing a part of the lawn mower A according to Modification 3 of the present invention, and is a view showing a state during the offset movement of the working part 3. Note that in FIG. 8, some members are simplified for easy understanding of the offset movement. Modification 3 is different from Modification 2 in that the shape of the upper end side of the third telescopic member 28 in Modification 2 is changed. The structure of Modification 3 other than the structure different from the structure of Modification 2 is almost the same as the structure of Modification 2. When other constituent members are arranged in the movement locus of the third telescopic member 28, by making a part of the third telescopic member 28 into a curved portion 28a, it is possible to avoid contact with this constituent member and prevent contact with other constituent members.

[0045] [Modification 4] FIG. 9 is a view showing a part of the lawn mower A according to Modification 1 of the present invention, (a) is a view of the storage state of the working part 3, (b) is a view of the state during the offset movement of the working part 3, (c) is a view of the maximum offset state of the working part 3, and (d) is a view showing the offset movement of the working part 3. Note that in (d), some members are omitted for easy understanding of the offset movement. Modification 4 is different from the first embodiment in that in the first embodiment, the rotation support member 23 and the second telescopic member 27, which are mechanisms for tilting the working part 3, are removed, and the connection structure between the second support arm 25 (a part of the second rotation frame part) and the working part 3 is changed. The structure of Modification 4 other than the structure different from the structure of the first embodiment is all the same as the structure of the first embodiment. This lawn mower A of Modification 4 cannot tilt the working part 3, does not perform work on an inclined surface, and is specialized for work on a flat surface. In Modification 4, the lower end of the second support arm 25 is pivotally connected to a second support arm lower end side support shaft 37a provided on a second support arm lower end side support portion 37 fixed to the working portion 3 so as to be rotatable left and right. As shown in FIG. 9(d), also in Modification 4, similar to the first embodiment, when the first telescopic member 26 is telescoped, the working portion 3 can be offset and moved substantially in the horizontal direction with almost no vertical movement. By omitting the mechanism for tilting the working portion 3, the weight of the working portion 3, and thus the weight of the lawn mower A, can be reduced.

[0046] [Second Embodiment] Hereinafter, the lawn mower B according to the second embodiment of the present invention will be described with reference to the drawings. Note that the agricultural working machine is not limited to a lawn mower, and any machine that can be offset and moved may be used, such as a ridging machine. In the following description, the same reference numerals in different figures denote parts having the same function, and duplicate descriptions in each figure are omitted as appropriate. For the sake of 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 travels is forward, and the opposite is backward. Further, toward the front, the right side is the rightward direction, and the left side is the leftward direction.

[0047] FIGS. 10, 11, and 12 are diagrams showing the configurations of the lawn mower B according to the second embodiment in the stored state, the state during offset movement, and the maximum offset state, respectively. In each figure, the upper row shows, from the left, a perspective view of the lawn mower B seen obliquely from the upper left rear, a plan view, a perspective view of the lawn mower B seen obliquely from the upper right rear, and the lower row shows, from the left, a left side view, a view seen from the rear, and a right side view.

[0048] [Overall Structure] The lawn mower B according to the second embodiment performs a lawn mowing operation while moving forward as the traveling vehicle body (not shown) travels, and includes a mounting portion 4, an offset mechanism portion 5, and a working portion 6.

[0049] [Mounting Portion] The mounting part 4 is connected to a three-point link mechanism (not shown) provided at the rear of the traveling vehicle body. 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.

[0050] The mounting part 4 has a frame 41 having a connecting part connected to the three-point link and a lawn mower power input shaft (not shown) to which power from the PTO shaft (not shown) of the traveling vehicle body is transmitted. Near the left and right centers of the frame 41, a rotating frame upper end side support shaft 411 for rotatably connecting a rotating frame 51, which will be described later, to the left and right is provided so as to protrude rearward. Inside the rotating frame upper end side support shaft 411, a lawn mower power input shaft for inputting power to the lawn mower B is housed, and the rotating frame upper end side support shaft 411 and the lawn mower power input shaft are arranged concentrically. On the upper left end side of the frame 41, an upper end side support part 412 for rotatably connecting a support arm 53, which will be described later, to the left and right is provided so as to protrude rearward. Note that the mounting part 4 may be connected to the three-point link mechanism of the traveling vehicle body via a known auto hitch.

[0051] [Working part] The working part 6 includes a lawn mowing claw and a claw shaft to which a plurality of lawn mowing claws are attached and which is rotationally driven by power from the power input shaft, and has a working rotor (both not shown) for performing a lawn mowing operation. The working rotor is covered by a shield cover 62 and side plates 63 provided on both the left and right sides of the shield cover 62. A working part transmission case 61 is provided outside the left side plate 63. In the working part transmission case 61, a rotating frame lower end side support shaft 61a rotatably connected to the lower end side of the rotating frame 51 is provided so as to protrude rearward. Inside the rotating frame lower end side support shaft 61a, a working part input shaft (not shown) is housed. The working part input shaft transmits power from the transmission means in the rotating frame 51, which will be described later, to the rotating shaft of the working rotor, and rotates the claw shaft and the lawn mowing claws. The shield cover 62 is configured in a sickle shape in side view and covers the upper part of the working rotor. A second telescopic member support portion 64 for attaching a second telescopic member 55 described later is provided protruding on the rear side of the shield cover 62 (the side rear of the rotation center of the claw shaft in plan view).

[0052] [Offset mechanism section] The offset mechanism section 5 has a rotation frame 51, a rotation support member 52 and a support arm 53 (rotation frame section), a first telescopic member 54, and a second telescopic member 55. In this specification, the offset mechanism section 5 includes a mechanism for tilting the working section 6 in addition to the mechanism for offsetting the working section 6. The upper end side of the rotation frame 51 is connected to the rotation frame upper end side support shaft 411 of the mounting section 4 so as to be rotatable left and right. The lower end side of the rotation frame 51 is connected to the rotation frame lower end side support shaft 61a provided so as to protrude rearward from the working section transmission case 61 of the working section 6 so as to be rotatable left and right. Inside the rotation frame lower end side support shaft 61a, a working section input shaft (not shown) is housed, and the rotation frame lower end side support shaft 61a and the working section input shaft are arranged concentrically. The rotation frame 51 is configured to be hollow, and a winding transmission means (power transmission means: not shown) is housed therein. The input shaft of the winding transmission means is the lawn mower power input shaft of the mounting section 4, and the output shaft of the winding transmission means is the working section input shaft inside the rotation frame lower end side support shaft 61a. The winding transmission means is constituted by, for example, a sprocket and a chain. That is, a drive sprocket of the winding transmission means is provided at the end portion of the lawn mower power input shaft located inside the rotation frame 51, and a driven sprocket of the winding transmission means is provided at the end portion of the working section input shaft located inside the rotation frame 51. A chain is wound around these drive sprocket and driven sprocket so as to transmit the power of the drive side sprocket (lawn mower power input shaft) to the driven side sprocket (working section input shaft).

[0053] In the second embodiment, the rotating frame 51 is hollow and houses the winding transmission means inside. However, the rotating frame 51 may not house the winding transmission means inside, and a transmission case for housing the winding transmission means may be provided separately.

[0054] A rotation support member 52, which will be described later, is rotatably supported on the lower end side support shaft 61a of the rotating frame. The rotation support member 52 has a substantially C-shaped form. The bent portion of the C-shape is rotatably supported on the lower end side support shaft 61a of the rotating frame. The lower end side of the support arm 53 is rotatably connected to one end of the C-shape (left side in a rear view), and the rod side of the second telescopic member 55 is rotatably connected to the other end of the C-shape (right side in a rear view).

[0055] The upper end side of the support arm 53 is rotatably connected in the left-right direction to the upper end side support shaft 412a provided in the front-rear direction on the upper end side support portion 412 of the support arm of the mounting portion 4. The lower end side of the support arm 53 is rotatably connected in the left-right direction to a support shaft provided on the rotation support member 52.

[0056] The upper end side, which is the cylinder side, of the first telescopic member 54 is rotatably connected in the left-right direction to the upper end side support shaft 412a of the upper end side support portion 412 of the support arm of the mounting portion 4 together with the support arm 53. Also, the lower end side, which is the rod side, of the first telescopic member 54 is rotatably connected in the left-right direction to the front-rear direction lower end side support shaft 511a provided on the lower end side support portion 511 of the rotating frame 51 for the first telescopic member. This first telescopic member 54 is used when offsetting and moving the working portion 6. One end of the second telescopic member 55 is rotatably connected to one end portion of the rotation support member 52, and the other end is rotatably connected to the second telescopic member support portion 64 of the working portion 6. This second telescopic member 55 is used when tilting and moving the working portion 6.

[0057] In the second embodiment, as described above, the rotating frame 51 is supported behind the mounting portion 4, the working portion 6 is supported in front of the rotating frame 51, and the working portion 6 is disposed below the mounting portion 4. With this arrangement, the working portion 6 is positioned closer to the traveling vehicle body, and it is possible to prevent the weight balance of the traveling vehicle body from being deteriorated.

[0058] [Offset movement] FIG. 13 is a view showing the offset movement of the lawn mower B according to the second embodiment of the present invention, (a) is a view showing the offset movement of the working portion 6, (b) is a view showing a state where the working portion 6 is tilted upward, and (c) is a view showing a state where the working portion 6 is tilted downward. Note that FIG. 13 simplifies some members in order to make the offset movement and the tilt movement easier to understand. As described above, in the offset mechanism portion 5, the rotating frame 51 is connected downward to the mounting portion 4, and the working portion 6 is connected to the lower end side of the rotating frame 51, whereby the working portion 6 is connected to and supported by the mounting portion 4. Furthermore, the support arm 53 connects the mounting portion 4 and the rotation support member 52.

[0059] In the above-described offset mechanism portion 5, as shown in FIG. 13(a), the working portion 6 is offset by expanding and contracting the first expansion and contraction member 54. In the second embodiment, in the stored state where the working portion 6 is located behind the traveling vehicle body, the first expansion and contraction member 54 is in the most contracted state. When the first expansion and contraction member 54 is extended, the working portion 3 is offset to the side of the traveling vehicle body, and in the state where the first expansion and contraction member 54 is most extended, it becomes the maximum offset state where the offset amount is maximum. The offset mechanism unit 5 of the second embodiment constitutes a parallel link arranged in the vertical direction by the frame 41 of the mounting unit 4, the rotating frame 51, the rotation support member 52, and the support arm 53, and a rotating shaft that rotatably connects these to each other is arranged parallel to the front-rear direction (travel direction). Therefore, when the working unit 6 moves offset, the working unit 6 does not move in the front-rear direction. For this reason, it is possible to perform stable offset movement without changing the front-rear balance of the load applied to the traveling vehicle body due to the offset movement.

[0060] Further, as shown in Fig. 13(a), when the working unit 6 of the second embodiment moves offset, the working unit 6 remains in a substantially horizontal state and moves slightly in the vertical direction but does not move significantly in the vertical direction. In Fig. 13(a), it can be read that although the lower end side support shaft 61a of the rotating frame moves along an arc-shaped locus T centered on the upper end side support shaft 411 of the rotating frame, it does not move significantly in the vertical direction. Due to the configuration that enables such an offset movement with little vertical movement, in the lawn mower B of the second embodiment, the working unit 6 can be moved offset without being in a state where the working unit 6 is lifted significantly. In the second embodiment, when the first telescopic member 54 is in the most contracted state, the working unit 6 is in the stored state, and when the first telescopic member 54 is in the most extended state, the working unit 6 is in the maximum offset state. However, it may be configured such that when the first telescopic member 54 is in the most extended state, the working unit 6 is in the stored state, and when the first telescopic member 54 is in the most contracted state, the working unit 6 is in the maximum offset state.

[0061] Hereinafter, the offset movement in the second embodiment will be described in detail. First, the displacement from the stored state shown on the left side of Fig. 13(a) to the state during offset movement shown in the center will be described. (See also Figs. 10 and 11.) From the state shown on the left side of Fig. 13(a), as the first telescopic member 54 extends, the lower end side support shaft 511a of the first telescopic member is pushed by the first telescopic member 54, and the upper end side of the rotating frame 51 rotates to the right with the upper end side support shaft 411 of the rotating frame of the mounting unit 4 as the rotation center axis. The link mechanism of the swing frame 51, frame 41, support arm 53, and swing support member 52 enables the working unit 6 to move while maintaining a substantially horizontal state without rotating with respect to the ground. Since the lower end side of the swing frame 51 rotates to the right with the upper end side support shaft 411 of the swing frame as the rotation center axis, the lower end side support shaft 61a of the swing frame moves downward with respect to the upper end side support shaft 411 of the swing frame.

[0062] Next, the displacement to the maximum offset state shown on the right will be described based on the state diagram during offset movement shown in the center of Fig. 13(a). (See also Figs. 11 and 12.) From the state shown in the center of Fig. 13(a), as the first telescopic member 54 further extends, the lower end side support portion 511 of the first telescopic member is pushed, and the upper end side of the swing frame 51 rotates further to the right with the upper end side support shaft 411 of the swing frame of the mounting portion 1 as the rotation center axis. The link mechanism of the swing frame 51, frame 41, support arm 53, and swing support member 52 enables the working unit 6 to move while maintaining a substantially horizontal state without rotating with respect to the ground. Since the lower end side of the swing frame 51 rotates to the right with the upper end side support shaft 411 of the swing frame as the rotation center axis, the lower end side support shaft 61a of the swing frame moves upward with respect to the upper end side support shaft 411 of the swing frame.

[0063] As described above, in the second embodiment, the link mechanism of the swing frame 51, frame 41, support arm 53, and swing support member 52 enables the working unit 6 to move while maintaining a substantially horizontal state without rotating with respect to the ground. Also, since the lower end side support shaft 61a of the lower end side of the swing frame 51 performs an arc motion around the upper end side support shaft 411 of the swing frame, the working unit 6 moves slightly up and down but moves substantially in the horizontal direction. Also, in the second embodiment, by only expanding and contracting the first expansion and contraction member 54, the working unit 6 can be offset and moved in a substantially horizontal direction while maintaining a substantially horizontal state without moving back and forth. That is, without requiring a complicated configuration such as controlling a plurality of expansion and contraction members in cooperation, with a simple configuration, the working unit 6 can be offset and moved without moving in the front-rear and up-down directions, achieving the effect of being able to perform such movement.

[0064] As described above, when the upper end side support shaft 411 of the rotating frame, which is the rotating shaft for rotatably connecting the rotating frame 51, is parallel to the traveling direction, there is no movement of the working unit 6 in the front-rear direction. However, due to relationships such as the traveling vehicle body and the location where the mowing operation is performed, the entire mower B may be inclined in the front-rear direction by slightly raising the mower B by means of the three-point link of the traveling vehicle body. In this case, since the upper end side support shaft 411 of the rotating frame is also inclined with respect to the traveling direction, when the working unit 6 is offset and moved, the working unit 6 moves slightly in the front-rear direction due to the fact that when the upper end side support shaft 411 of the rotating frame is parallel to the traveling direction, the working unit 6 moves slightly in the up-down direction.

[0065] [Tilt movement] In the second embodiment, the offset mechanism unit 5 has a second expansion and contraction member 55 for tilting the working unit 6. The second expansion and contraction member 55 connects the rotation support member 52 and the second expansion and contraction member support portion 64 provided on the shield cover 62 of the working unit 6. In the offset mechanism unit 5, by expanding and contracting the second expansion and contraction member 55, as shown in FIGS. 13(b) and (c), the working unit 6 can be tilted and moved in both the up and down directions with the lower end side support shaft 61a of the rotating frame as the rotation center axis. In the second embodiment, as shown in FIG. 13(b), when the second expansion and contraction member 55 is contracted, the working unit 6 is in an upwardly tilted state, and as shown in FIG. 13(c), when the second expansion and contraction member 55 is extended, the working unit 6 is in a downwardly tilted state. Note that it is also possible to configure such that the working unit 6 tilts upward in a state where the second expansion and contraction member 55 is extended, and the working unit 6 tilts downward in a state where the second expansion and contraction member 55 is contracted.

[0066] In the above-described first embodiment, its modification examples 1 to 4, and the second embodiment, a chain mechanism (sprocket and chain) has been described as the winding transmission means (power transmission means) in the first rotating frame 21, the second rotating frame 22, and the rotating frame 51. However, a belt drive mechanism (pulley and belt) or a wire drive mechanism (wire and pulley) may be employed. Further, other power transmission means such as a combination of a gear and a transmission shaft other than the winding transmission means may be employed.

[0067] As described above, the lawn mower A according to the first embodiment of the present invention, its modification examples 1 to 4, and the lawn mower B according to the second embodiment have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments and modification examples, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention. Further, the above-described embodiments and modification examples can be combined by diverting each other's technologies as long as there are no particular contradictions or problems in their purposes and configurations.

Explanation of Reference Numerals

[0068] A Lawn mower 1 Mounting portion 11 Frame 111 Lower end side support shaft of the first rotating frame 112 Lower end side support shaft of the first expansion and contraction member 113 Lower end side support shaft of the first support arm 2 Offset mechanism portion 21 First rotating frame 211 Upper end side support shaft of the second rotating frame 212 Upper end side support portion of the first expansion and contraction member 212a Upper end side support shaft of the first expansion and contraction member 213 Upper end side support portion of the second support arm 213a Upper end side support shaft of the second support arm 214 Upper end side support portion of the third expansion and contraction member Upper-end-side support shaft of the 214a third telescopic member 22 Second rotating frame 221 Upper-end-side support portion of the first support arm 221a Upper-end-side support shaft of the first support arm 222 Second rotating frame connecting member 23, 23a Rotating support members 23b Link mechanism 23b1 First link arm 23b2 Second link arm 24 First support arm 25 Second support arm 26 First telescopic member 27 Second telescopic member 28 Third telescopic member 28a Curved portion 3 Working portion 31 Working portion transmission case 31a Lower-end-side support shaft of the second rotating frame 32 Shield cover 33 Side plate 34 Second telescopic member support portion 35 Link mechanism support portion 36 Lower-end-side support portion of the third telescopic member 36a Lower-end-side support shaft of the third telescopic member 36b Long hole 37 Lower-end-side support portion of the second support arm 37a Lower-end-side support shaft of the second support arm B Lawn mower 4 Mounting portion 41 Frame 411 Upper-end-side support shaft of the rotating frame 412 Upper-end-side support portion of the support arm 412a Upper-end-side support shaft of the support arm 5 Offset mechanism portion 51 Rotating frame 511 Lower-end-side support portion of the first telescopic member 511a Lower-end-side support shaft of the first telescopic member 52 Rotating support member 53 Support arm 54 First telescopic member 55 Second telescopic member 6 Working unit 61 Working unit transmission case 61a Rotating frame lower end side support shaft 62 Shield cover 63 Side plate 64 Second telescopic member support part T Locus

Claims

1. A mounting part connectable to a traveling vehicle body, A working part that receives power from the traveling vehicle body and performs a predetermined operation, An offset mechanism part that connects the mounting part and the working part and moves the working part in the left - right direction, characterized in that the offset mechanism part comprises A first rotating frame part whose lower end side is rotatably connected to the mounting part, A second rotating frame part whose upper end side is rotatably connected to the upper end side of the first rotating frame part and whose lower end side is rotatably connected to the working part, A first telescopic member that connects the upper end side of the first rotating frame part and the mounting part, An agricultural working machine characterized by having the above.

2. The first rotating frame part has a first rotating frame whose lower end side is rotatably connected to the mounting part, and a first support arm whose lower end side is rotatably connected to the mounting part. The second rotating frame part has a second rotating frame whose upper end side is rotatably connected to the upper end side of the first rotating frame and whose lower end side is rotatably connected to the working part, a rotation support member whose lower end side is rotatably connected to the working part, and a second support arm whose upper end side is rotatably connected to the upper end side of the first rotating frame and whose lower end side is rotatably connected to the rotation support member. The first telescopic member connects the upper end side of the first rotating frame and the mounting part. The agricultural working machine according to claim 1, characterized in that

3. The agricultural working machine according to claim 2, characterized in that the upper end side of the first support arm is connected to the upper end side of the second rotating frame.

4. The second rotating frame is connected behind the first rotating frame, and the working part is connected in front of the second rotating frame. The agricultural working machine according to claim 2, characterized in that

5. The agricultural working machine according to claim 2, characterized by having a second telescopic member that connects the rotation support member and the working part.

6. It has a link mechanism composed of two link arms that are rotatably attached to the connection point between the second support arm and the rotation support member and the working part respectively and are rotatably connected to each other, and has a second telescopic member that connects the connection point of the two link arms and the working part. The agricultural working machine according to claim 2, characterized in that

7. The agricultural working machine according to any one of claims 2 to 6, characterized in that the first rotating frame and the second rotating frame house power transmission means inside.

8. ​ The first rotating frame part is a first rotating frame with its lower end side rotatably connected to the mounting part, and a first support arm with its lower end side rotatably connected to the mounting part. The second rotating frame part is a second rotating frame with its upper end side rotatably connected to the upper end side of the first rotating frame and its lower end side connected to the working part, and a second support arm with its upper end side rotatably connected to the upper end side of the first rotating frame and its lower end side rotatably connected to the working part. The first telescopic member connects the upper end side of the first rotating frame and the mounting part. The agricultural working machine according to claim 1, characterized in that.

9. The second rotating frame is connected behind the first rotating frame, and the working part is connected in front of the second rotating frame. The agricultural working machine according to claim 8, characterized in that.

10. The second support arm is a telescopic member. The agricultural working machine according to claim 8, characterized in that.

11. The first rotating frame and the second rotating frame house power transmission means inside. The agricultural working machine according to any one of claims 8 to 10, characterized in that.

12. a mounting part connectable to a traveling vehicle body, a working part that receives power from the traveling vehicle body and performs a predetermined operation, an offset mechanism part that connects the mounting part and the working part and moves the working part in the left - right direction, and is provided with The offset mechanism part is a rotating frame part with its upper end side rotatably connected to the mounting part and its lower end side connected to the working part, and a first telescopic member that connects the lower end side of the rotating frame part and the mounting part. The agricultural working machine is characterized by having.

13. The rotating frame part is a rotating frame with its upper end side rotatably connected to the mounting part and its lower end side rotatably connected to the working part, a rotating support member rotatably connected to the working part, and a support arm with its upper end side rotatably connected to the mounting part and its lower end side rotatably connected to the rotating support member. The first telescopic member connects the lower end side of the rotating frame and the mounting part. The agricultural working machine according to claim 12, characterized in that.

14. The rotating frame is connected behind the mounting part, and the working part is connected in front of the rotating frame. The agricultural working machine according to claim 13, characterized in that.

15. The agricultural working machine according to claim 13, characterized by having a second telescopic member that connects the rotary support member and the working part.

16. The agricultural working machine according to any one of claims 13 to 15, characterized in that the rotary frame houses power transmission means therein.

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