Working machine

Abstract

To provide an implement comprising: a rolling operation mechanism for performing rolling operation of a grounding work device coupled to a travel machine body, the implement capable of suppressing staggering of the grounding work device in a neutral state of the rolling operation.SOLUTION: An implement comprises: a rolling operation mechanism 20; a rolling operation part 23 which is supported to the machine lateral direction so as to displace freely; a rolling actuator 24 for displacing and operating the rolling operation part 23; a left linkage mechanism 30 for linking the rolling operation part 23 to a left lateral part 19a of the grounding work device through a left resilient machine 32; and a right linkage mechanism 40 for linking the rolling operation part 23 to a right lateral part 19b of the grounding work device, through a right resilient machine 42. The left resilient machine 32 and the right resilient machine 42 have elastic restoration force in a neutral state of the rolling operation part 23.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a working machine including a traveling body, a ground working device rollably connected to the traveling body about an axis in the longitudinal direction of the body, and a rolling operation mechanism for rolling the ground working device.

Background Art

[0002] Among the above-described working machines, the rolling operation mechanism includes a rolling operation part supported so as to be displaceable in the left-right direction of the body on the traveling body side, a rolling actuator for displacing the rolling operation part, a left interlocking mechanism for interlocking the rolling operation part with the left lateral part of the ground working device via a left elastic member, and a right interlocking mechanism for interlocking the rolling operation part with the right lateral part of the ground working device via a right elastic member.

[0003] As an example of this type of working machine, there is a riding type rice transplanter shown in Patent Document 1. In this riding type rice transplanter, a ground working device (seedling planting device) rollably connected to the traveling body is provided. A rolling operation part (drive arm) supported so as to be displaceable in the left-right direction of the body on the traveling body side (rear link member), a rolling actuator (rolling motor) for displacing the rolling operation part, a left interlocking mechanism for interlocking the rolling operation part with the left lateral part (left part of the horizontal frame) of the ground working device via a left elastic member (fusion spring), and a right interlocking mechanism for interlocking the rolling operation part with the right lateral part (right part of the horizontal frame) of the ground working device via a right elastic member (fusion spring) are provided.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventionally, when the rolling operation unit is in the neutral state, if an operating force in the direction of swinging this is applied to the ground working device, even a weak operating force such as an operating force caused by vibration transmitted from the traveling body to the ground working device causes the ground working device to wobble, and the work finish of the ground working device deteriorates, such as different left and right seedling planting depths in the seedling planting device.

[0006] The present invention provides a working machine capable of making the ground working device less likely to wobble when the rolling operation unit is in the neutral state.

Means for Solving the Problems

[0007] The working machine according to the present invention includes a traveling body, a ground working device rollably connected to the traveling body around a longitudinal axis of the body, and a rolling operation mechanism for rollingly operating the ground working device. The rolling operation mechanism includes a rolling operation unit supported on the traveling body side portion so as to be displaceable in the left-right direction of the body, a rolling actuator for displacing the rolling operation unit, a left interlocking mechanism for interlocking the rolling operation unit with the left side portion of the ground working device via a left elastic member, and a right interlocking mechanism for interlocking the rolling operation unit with the right side portion of the ground working device via a right elastic member. The left elastic member is In the neutral state of the rolling operation unit, between the rolling operation unit and the ground working device left lateral part has an elastic restoring force in the direction of separating them and the right elastic member has an elastic restoring force in a direction to separate the rolling operation part from the right lateral part of the ground working device in the neutral state of the rolling operation part .

[0008] According to this configuration, since the left elastic member or the right elastic member resists with an elastic restoring force against the operating force for swinging the ground working device, even if an operating force in the direction of swinging this is applied to the ground working device, as long as it is a weak operating force that the left elastic member and the right elastic member can resist, the ground working device is not swung. That is, when the rolling operation force of the rolling operation unit is transmitted to the ground working device, it is possible to make the ground working device less likely to wobble when the rolling operation unit is in the neutral state while generating some interlocking flexibility due to the elastic deformation of the left elastic member and the right elastic member.

[0009] In the present invention, it is preferable that a left restoring force adjusting portion capable of adjusting the elastic restoring force of the left elastic member and a right restoring force adjusting portion capable of adjusting the elastic restoring force of the right elastic member are provided.

[0010] According to this configuration, since the elastic restoring forces of the left elastic member and the right elastic member can be adjusted, even when the load on the left side and the load on the right side in the ground working device are different, for example, the elastic restoring force of the left elastic member can be adjusted to a strength adapted to the load on the left side, and the elastic restoring force of the right elastic member can be adjusted to a strength adapted to the load on the right side, making the ground working device less likely to wobble.

[0011] In the present invention, the left interlocking mechanism is provided with a left interlocking rod having one end connected to the rolling operation portion, and a left connecting member connected to the left lateral portion in a state of slidably supporting the other end of the left interlocking rod. The left elastic member is a left coil spring externally fitted to the left interlocking rod while being sandwiched between a spring receiving portion provided at one end of the left interlocking rod and a spring receiving portion provided at the left connecting member. The left restoring force adjusting portion is configured to change the amount of compressive elastic deformation of the left coil spring by changing the distance between the spring receiving portion of the left interlocking rod and the spring receiving portion of the left connecting member. The right interlocking mechanism is provided with a right interlocking rod having one end connected to the rolling operation portion, and a right connecting member connected to the right lateral portion in a state of slidably supporting the other end of the right interlocking rod. The right elastic member is a right coil spring externally fitted to the right interlocking rod while being sandwiched between a spring receiving portion provided at one end of the right interlocking rod and a spring receiving portion provided at the right connecting member. The right restoring force adjusting portion is configured to change the amount of compressive elastic deformation of the right coil spring by changing the distance between the spring receiving portion of the right interlocking rod and the spring receiving portion of the right connecting member, which is preferable.

[0012] According to this configuration, when the rolling operation unit is operated by the rolling actuator, the left interlocking rod is pushed by the rolling operation unit toward the left coil spring to push the left coil spring, and in a state where the left coil spring has an elastic restoring force, the left connecting member is pushed to transmit the rolling operation force of the rolling operation unit to the left lateral part. When the rolling operation unit is operated by the rolling actuator, the right interlocking rod is pushed by the rolling operation unit toward the right coil spring to push the right coil spring, and in a state where the right coil spring has an elastic restoring force, the right connecting member is pushed to transmit the rolling operation force of the rolling operation unit to the right lateral part. Therefore, the rolling operation force of the rolling operation unit can be firmly transmitted to the left lateral part and the right lateral part.

[0013] Since the left elastic member is the left coil spring, the structure of the left restoring force adjusting unit can be a simple structure that only changes the distance between the spring receiving portion of the left interlocking rod and the spring receiving portion of the left connecting member. Since the right elastic member is the right coil spring, the structure of the right restoring force adjusting unit can be a simple structure that only changes the distance between the spring receiving portion of the right interlocking rod and the spring receiving portion of the right connecting member.

[0014] In the present invention, when the left interlocking mechanism transmits the rolling operation force of the rolling operation unit to the left lateral part, a right interlocking accommodation part that allows relative movement between the rolling operation unit and the right interlocking mechanism is provided, and when the right interlocking mechanism transmits the rolling operation force of the rolling operation unit to the right lateral part, it is preferable that a left interlocking accommodation part that allows relative movement between the rolling operation unit and the left interlocking mechanism is provided.

[0015] According to this configuration, when the rolling operation force of the rolling operation unit is transmitted to the left lateral part and the rolling operation of the ground working device is performed, the rolling operation unit and the right interlocking mechanism relatively move by the right interlocking accommodation part, and the load on the right lateral side of the ground working device is not applied to the rolling operation unit. When the rolling operation force of the rolling operation unit is transmitted to the right lateral part and the rolling operation of the ground working device is performed, the rolling operation unit and the left interlocking mechanism relatively move by the left interlocking accommodation part, and the load on the left lateral side of the ground working device is not applied to the rolling operation unit. Therefore, when the rolling operation force of the rolling operation unit is transmitted to the left lateral part, the load on the right lateral side of the ground working device is applied to the rolling operation unit, and when the rolling operation force of the rolling operation unit is transmitted to the right lateral part, compared with the case where the load on the left lateral side of the ground working device is applied to the rolling operation unit, a rolling actuator with a small output can be adopted.

[0016] In the present invention, It is preferable that the left interlocking mechanism is provided with a left interlocking rod having one end connected to the rolling operation unit, the left interlocking accommodation part is provided on one of the one end of the left interlocking rod and the rolling operation unit, and has a left long hole in which the other of the one end of the left interlocking rod and the rolling operation unit slidably engages. The right interlocking mechanism is provided with a right interlocking rod having one end connected to the rolling operation unit, the right interlocking accommodation part is provided on one of the one end of the right interlocking rod and the rolling operation unit, and has a right long hole in which the other of the one end of the right interlocking rod and the rolling operation unit slidably engages.

[0017] According to this configuration, the left interlocking accommodation part can be obtained by a simple structure having only a left long hole in which the other of the one end of the left interlocking rod and the rolling operation unit slidably engages on one of the one end of the left interlocking rod and the rolling operation unit. The right interlocking accommodation part can be obtained by a simple structure having only a right long hole in which the other of the one end of the right interlocking rod and the rolling operation unit slidably engages on one of the one end of the right interlocking rod and the rolling operation unit.

[0018] In the present invention, It is preferable that a plurality of magnetic generation units are provided at a plurality of locations of the rolling operation unit, and a magnetic sensor that detects an operation position of the rolling operation unit by detecting each of the plurality of magnetic generation units is provided.

[0019] According to this configuration, since a plurality of operation positions of the rolling operation unit are detected by magnetic sensors that are fewer in number than the plurality of magnetic generation units, a plurality of operation positions of the rolling operation unit can be detected by a detection mechanism having a simple structure with a small number of magnetic sensors.

[0020] In the present invention, an upper link and a lower link that extend from the traveling body so as to be vertically swingable, and a rear link that is connected to a free end portion of the upper link and a free end portion of the lower link and supports the ground working device so as to be rollable are provided, and a link mechanism that connects the ground working device to the traveling body so as to be liftable and lowerable is provided. It is preferable that an operation case that houses the magnetic sensor is supported by the rear link.

[0021] According to this configuration, since the rear link is utilized as a support member for the operation case, the support structure of the operation case can be simplified.

[0022] In the present invention, The working machine according to claim 8, wherein the rolling operation unit is supported by a first outer peripheral portion of an outer peripheral portion of the operation case, and an electric wire extending from the magnetic sensor is wired along a second outer peripheral portion that faces a direction different from a direction in which the first outer peripheral portion of the outer peripheral portion of the operation case faces.

[0023] According to this configuration, compared to wiring the electric wire to the first outer peripheral portion, there is no need to consider preventing the electric wire from touching the rolling operation unit, which is a movable member, so the electric wire can be easily wired.

[0024] In the present invention, When the ground working device is in the lowest operation position, it is preferable that the operation case is supported by the rear link in a state of being located along the upper link above the upper link.

[0025] According to this configuration, the height of the space required to be provided above the upper link to position the operation case on the upper link can be made lower than when the operation case is located above the upper link in a posture non-parallel to the upper link. Therefore, even when the device part of the ground working device is located above the upper link, it is easy to install the operation case in the space between the upper link and the device part.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0027] Hereinafter, an embodiment which is an example of the present invention will be described based on the drawings. In the following description, regarding the traveling body of a riding type rice transplanter (an example of a "working machine"), the direction of arrow F shown in FIGS. 1 and 2 etc. is defined as "front of the machine body", the direction of arrow B as "rear of the machine body", the direction of arrow U as "above the machine body", the direction of arrow D as "below the machine body", the direction of L shown in FIG. 2 as "left of the machine body", and the direction of arrow R as "right of the machine body".

[0028] 〔Overall of Riding Type Rice Transplanter〕 As shown in FIG. 1, the riding type rice transplanter has a traveling body 3 provided with a pair of left and right front wheels 1 that can be swing-steered and driven, and a pair of left and right rear wheels 2 that can be driven. At the front part of the traveling body 3, a power unit 4 equipped with an engine (not shown) is formed. At the rear part of the traveling body 3, a driver's cab 5 is formed. The driver's cab 5 is equipped with a driver's seat 6 and a steering wheel 7 for steering the front wheels 1. A seedling planting device 10 is connected to the rear part of the traveling body 3. The connection of the seedling planting device 10 to the traveling body 3 is carried out by connecting the front part of the device frame 11 of the seedling planting device 10 to the free end of a link mechanism 8 provided at the rear part of the traveling body 3. The link mechanism 8 is supported by the machine body frame 9 so as to be vertically swingable. The link mechanism 8 is provided with a lifting cylinder 8b connected to the machine body frame 9 and the rear link 8a of the link mechanism 8. The seedling planting device 10 is lifted and lowered over a lowering working state and a rising non-working state by being lifted and lowered when the link mechanism 8 is expanded and contracted by the lifting cylinder 8b.

[0029] 〔Seedling Planting Device〕 As shown in FIGS. 1 and 2, the seedling planting device 10 is provided with a device frame 11 having a main frame 11a extending along the left-right direction of the device, and a plurality of planting drive cases 11b extending rearward from a plurality of positions in the left-right direction of the main frame 11a of the device. Seedling planting mechanisms 12 are supported on both lateral sides at the rear part of each planting drive case 11b so as to be drivable. In this embodiment, four planting drive cases 11b and eight seedling planting mechanisms 12 are provided. However, it may be provided with three or less, or four or more planting drive cases 11b, and seven or less, or nine or more seedling planting mechanisms 12. A seedling stage 13 is supported in a rearwardly inclined posture at the front portion of the apparatus frame 11. The seedling stage 13 is supported so as to be reciprocally slidable in the apparatus left-right direction in a state of including eight seedling placement portions 13a for placing the seedlings supplied to the eight seedling planting mechanisms 12. A sliding guide rail 14 for slidably guiding the lower portion of the seedling stage 13 is supported by the apparatus frame 11. Seedling outlets 15 are provided at portions of the sliding guide rail 14 corresponding to each of the eight seedling planting mechanisms 12. A plurality of ground floats 16 arranged in the apparatus left-right direction are supported at the lower portion of the apparatus frame 11.

[0030] In the seedling planting apparatus 10, the power from the engine is input to a feed case 17 (see FIG. 2) provided at the front portion of the apparatus frame 11 by a rotating shaft 18 (see FIG. 1). The input power is transmitted from the feed case 17 to each planting drive case 11b, and the two seedling planting mechanisms 12 of each of the four planting drive cases 11b are driven by the power transmitted to the planting drive case 11b. When each of the eight seedling planting mechanisms 12 is driven, the seedlings are alternately taken out from the seedling placement portion 13a at the seedling outlet 15 by a pair of seedling planting claws 12a (see FIG. 1), the taken-out seedlings are lowered and conveyed to the field, and a seedling planting motion of planting the seedlings at a location leveled by the ground float 16 in the field is performed. The seedling stage 13 is reciprocally transferred in the apparatus left-right direction guided by the sliding guide rail 14 in conjunction with the seedling planting motion of the seedling planting mechanism 12 by a seedling lateral feed mechanism (not shown) provided across the seedling stage 13 and the feed case 17, and the seedlings placed on the seedling placement portion 13a are reciprocally moved in the apparatus left-right direction with respect to the seedling outlet 15. The taking-out of the seedlings by the seedling planting claws 12a in each seedling planting mechanism 12 is sequentially performed from one end side to the other end side in the lateral width direction of the seedlings placed on the seedling placement portion 13a.

[0031] 〔Rolling Control of Seedling Planting Apparatus〕 The seedling planting device 10 is connected to the traveling machine body 3 so as to be rollable around the machine body longitudinal axis X (see Fig. 2). Specifically, as shown in Fig. 1, the link mechanism 8 provided at the rear part of the traveling machine body 3 has an upper link 8c and a lower link 8d that extend vertically swingably rearward from the machine body frame 9, and a rear link 8a connected to the free ends of the upper link 8c and the lower link 8d. A feed case 17 is provided at the central part in the left - right direction of the front part of the device frame 11. The feed case 17 is rotatably supported by the rear link 8a around the machine body longitudinal axis X, and the device frame 11 is rollably supported by the rear link 8a around the machine body longitudinal axis X.

[0032] As shown in Figs. 1 and 2, a rolling operation mechanism 20 for rolling the seedling planting device 10 with respect to the traveling machine body 3 is provided on the front side of the seedling mounting table 13. As shown in Fig. 3, a control device 21 is linked to the rolling operation mechanism 20, and an inclination angle sensor 22 for detecting the left - right inclination angle of the seedling planting device 10 is linked to the control device 21. The control device 21 controls the rolling operation mechanism 20 based on the detection result of the inclination angle sensor 22, and is configured to cause the rolling operation mechanism 20 to perform a rolling operation of the seedling planting device 10 so that the left - right posture of the seedling planting device 10 becomes horizontal or nearly horizontal. Even if the traveling machine body 3 inclines left and right due to unevenness of the field tillage, etc., it is possible to cause the seedling planting device 10 to perform a seedling planting operation in which the left and right seedling planting depths are the same or nearly the same. The left and right balance springs 56 shown in Fig. 2 are connected to the free ends of the link mechanism 8 that supports the seedling planting device 10 and the lateral end portions of the seedling mounting table 13, and are intended to achieve weight balance so that the left - hand weight and the right - hand weight of the seedling planting device 10 are balanced regardless of the left - right transfer of the seedling mounting table 13.

[0033] 〔Rolling operation mechanism〕 As shown in FIG. 3, the rolling operation mechanism 20 includes a sector gear 23 as a rolling operation portion, a rolling motor 24 as a rolling actuator that swings the sector gear 23, a left interlocking mechanism 30 that interlocks the sector gear 23 with the left lateral portion 19a of the seedling planting device 10, and a right interlocking mechanism 40 that interlocks the sector gear 23 with the right lateral portion 19b of the seedling planting device 10. As shown in FIGS. 6 and 7, an operation position detection mechanism 50 for detecting the operation position of the sector gear 23 is provided across the sector gear 23 and an operation case 25 as a support portion that supports the sector gear 23.

[0034] As shown in FIGS. 2, 3, and 4, the left lateral portion 19a of the seedling planting device 10 is constituted by a portion of a lateral frame 19 provided on the device frame 11 in a state of extending along the left - right direction of the device and located on the left - end side of the center in the left - right direction of the machine body. The right lateral portion 19b of the seedling planting device 10 is constituted by a portion of the lateral frame 19 located on the right - end side of the center in the left - right direction of the machine body. The lateral frame 19 constitutes a support frame 11c that supports the seedling table 13 so as to be movable in the left - right direction of the device. The support frame 11c is constituted by left and right support columns 11d erected at the left and right end portions of the main frame 11a and a lateral frame 19 erected on the upper portions of the left and right support columns 11d.

[0035] As shown in FIGS. 3 and 5, the sector gear 23 is supported by a rear link 8a as a portion on the traveling machine body side. As shown in FIGS. 3, 5, and 6, the support of the sector gear 23 to the rear link 8a is performed by providing an operation case 25 as a support portion on the upper portion of the rear link 8a and supporting the sector gear 23 by the operation case 25. The support of the sector gear 23 to the operation case 25 is performed by supporting a support shaft 23a of the sector gear 23 by a boss portion 25b provided on a first outer peripheral portion 25a of the operation case 25. The sector gear 23 is supported by the operation case 25 which is a support portion of the rear link 8a in a state where it can swing - displace in the left - right direction of the machine body with the axis P of the support shaft 23a as a swing fulcrum.

[0036] The rolling motor 24 is constituted by an electric motor. As shown in FIGS. 3, 5, and 6, the rolling motor 24 is supported together with the sector gear 23 on the first outer peripheral portion 25a of the operation case 25. The sector gear 23 and the rolling motor 24 are supported outside the operation case 25. In the present embodiment, the sector gear 23 and the rolling motor 24 are supported on the first outer peripheral portion 25a of the operation case 25, but the sector gear 23 and the rolling motor 24 may be distributed and supported on different outer peripheral portions of the operation case 25. As shown in FIGS. 5 and 6, the operation case 25 includes an upper case portion 25u supported by the rear link 8a, a lower case portion 25d that is fitted into the upper case portion 25u from below, closes the downward opening of the upper case portion 25u, and forms a space for accommodating the magnetic sensor 51 inside the operation case 25.

[0037] As shown in FIGS. 3, 5, and 6, the rolling motor 24 includes an output gear 24a that meshes with the sector gear 23. The rolling motor 24 is controlled by the control device 21, and the output gear 24a swings and displaces the sector gear 23 in the left - right direction of the aircraft body.

[0038] In the present embodiment, the rolling operation portion is constituted by the sector gear 23, and the rolling actuator is constituted by the rolling motor 24 which is an electric motor, but it is not limited thereto. As the rolling operation portion, a member that can be slidably displaced in the left - right direction of the aircraft body, such as adopting a rack of a rack and pinion, may be used. As the rolling actuator, a cylinder that operates the rolling operation portion by telescopic operation can be adopted. In the present embodiment, the support portion that supports the sector gear 23 and the rolling motor 24 is constituted by the operation case 25, but as the support portion, a member of any shape such as a single plate - shaped member or a groove - shaped member may be adopted.

[0039] As shown in FIGS. 1 and 5, when the seedling planting device 10 is in the lowest operation position, the operation case 25 is supported by the rear link 8a in a state of being located along the upper link 8c above the upper link 8c. When the seedling planting device 10 is in the lowest operation position, the distance between the portion 13b of the seedling table 13 located above the upper link 8c and the upper link 8c becomes the narrowest, but it is easy to provide the operation case 25, the sector gear 23, and the rolling motor 24 in the space between the upper link 8c and the seedling table 13.

[0040] 〔Left interlocking mechanism〕 As shown in FIG. 3, the left interlocking mechanism 30 includes a left interlocking rod 31 that interlocks the sector gear 23 with the left lateral portion 19a, a left member coil spring 32 as, and a left connecting member 33, and is configured to transmit the rolling operation force of the sector gear 23 to the left lateral portion 19a via the left interlocking rod 31, the left coil spring 32, and the left connecting member 33.

[0041] Specifically, as shown in FIGS. 3 and 6, one end portion 31a of the left interlocking rod 31 is connected to the sector gear 23. One end portion 31a of the left interlocking rod 31 is connected to the sector gear 23 on the side where the sector gear 23 is located with respect to the operation case 25. The connection of one end portion 31a of the left interlocking rod 31 to the sector gear 23 is performed by supporting the one end portion 31a on a connecting shaft 26 provided on the sector gear 23. The left connecting member 33 is connected to the left lateral portion 19a in a state of slidably supporting the other end portion 31b of the left interlocking rod 31 by a support hole 33a. The left coil spring 32 is externally fitted to the left interlocking rod 31 in a state of being sandwiched between a spring receiving portion 31c provided at one end portion 31a of the left interlocking rod 31 and a spring receiving portion 33b provided at the left connecting member 33. The left coil spring 32 is in a state of being elastically deformed in advance so as to have an elastic restoring force in the neutral state of the sector gear 23, that is, in a so-called initial elastic deformation state, and is sandwiched between the spring receiving portion 31c of the left interlocking rod 31 and the spring receiving portion 33b of the left connecting member 33.

[0042] As shown in FIGS. 3 and 4, the left linkage rod 31 includes a plate-shaped portion 31T that forms one end portion 31a and a spring receiving portion 31c, and a rod portion 31L that extends from the plate-shaped portion 31T toward the left connecting member 33 and forms the other end portion 31b. The spring receiving portion 31c of the left linkage rod 31 is constituted by a bent end portion provided at the end portion of the plate-shaped portion 31T on the rod portion side. The spring receiving portion 33b of the left connecting member 33 is constituted by a plate-shaped portion having a support hole 33a. The spring receiving portion 31c of the left linkage rod 31 and the spring receiving portion 33b of the left connecting member 33 are configured to receive the left coil spring 32 via a spring receiving member 34 positioned between the spring receiving portions 31c and 33b and the end portion of the left coil spring 32. The spring receiving member 34 is provided with a through hole through which the rod portion 31L is inserted.

[0043] 〔Right linkage mechanism〕 As shown in FIG. 3, the right linkage mechanism 40 includes a right linkage rod 41 that interlocks the sector gear 23 with the right lateral portion 19b, a right coil spring 42 as a right elastic member, and a right connecting member 43, and is configured to transmit the rolling operation force of the sector gear 23 to the right lateral portion 19b via the right linkage rod 41, the right coil spring 42, and the right connecting member 43.

[0044] Specifically, as shown in FIGS. 3 and 6, one end 41a of the right link rod 41 is connected to the sector gear 23. One end 41a of the right link rod 41 is connected to the sector gear 23 on the side where the sector gear 23 is located with respect to the operation case 25. The connection of one end 41a of the right link rod 41 to the sector gear 23 is achieved by supporting the one end 41a on a connecting shaft 26 provided on the sector gear 23. The right connecting member 43 is connected to the right lateral portion 19b in a state where the other end 41b of the right link rod 41 is slidably supported by a support hole 43a. The right coil spring 42 is externally fitted to the right link rod 41 while being sandwiched between a spring receiving portion 41c provided at one end 41a of the right link rod 41 and a spring receiving portion 43b provided at the right connecting member 43. The right coil spring 42 is in a state of being elastically deformed in advance so as to have an elastic restoring force in the neutral state of the sector gear 23, that is, in a so-called initial elastic deformation state, and is sandwiched between the spring receiving portion 41c of the right link rod 41 and the spring receiving portion 43b of the right connecting member 43.

[0045] As shown in FIGS. 3 and 4, the right link rod 41 includes a plate-like portion 41T that forms one end 41a and the spring receiving portion 41c, and a rod portion 41L that extends from the plate-like portion 41T toward the right connecting member 43 and forms the other end 41b. The spring receiving portion 41c of the right link rod 41 is constituted by a bent end provided at the end of the plate-like portion 41T on the rod portion side. The spring receiving portion 43b of the right connecting member 43 is constituted by a plate-like portion having a support hole 43a. The spring receiving portion 41c of the right link rod 41 and the spring receiving portion 43b of the right connecting member 43 are configured to receive the left coil spring 32 via a spring receiving member 44 located between the spring receiving portions 41c and 43b and the end of the right coil spring 42. The spring receiving member 44 is provided with a through hole through which the rod portion 41L is inserted.

[0046] As shown in Fig. 8, in this embodiment, the distance L1 from the connecting shaft 26 to the left lateral part 19a in the neutral state of the sector gear 23 and the distance L2 from the connecting shaft 26 to the right lateral part 19b in the neutral state of the sector gear 23 are configured to be the same, but it is not limited thereto. As the left interlocking mechanism 30 and the right interlocking mechanism 40, the distance L1 in the left interlocking mechanism 30 and the distance L2 in the right interlocking mechanism 40 may be different.

[0047] In this embodiment, a left coil spring 32 is adopted as the left elastic member, and a right coil spring 42 is adopted as the right elastic member, but it is not limited thereto. As the left elastic member and the right elastic member, various elastic members such as disc springs, spiral springs, and rubber materials can be adopted.

[0048] 〔Support of the left and right interlocking rods in the sector gear〕 As shown in Figs. 3 and 6, the support of one end 31a of the left interlocking rod 31 to the sector gear 23 is performed by providing a left connecting hole 36 (see Fig. 4) in one end 31a of the left interlocking rod 31 and externally fitting one end 31a to the connecting shaft 26 of the sector gear 23 through the left connecting hole 36. The support of one end 41a of the right interlocking rod 41 to the sector gear 23 is performed by providing a right connecting hole 46 (see Fig. 4) in one end 41a of the right interlocking rod 41 and externally fitting one end 41a to the connecting shaft 26 of the sector gear 23 through the right connecting hole 46. One end 31a of the left interlocking rod 31 and one end 41a of the right interlocking rod 41 are externally fitted to the connecting shaft 26 in a state of being arranged along the axial center of the connecting shaft 26.

[0049] As shown in Fig. 6, across the first shaft part 26a of the connecting shaft 26 where one end 31a of the left interlocking rod 31 is externally fitted and the left interlocking rod 31, a left connecting flexible part 27 is provided that allows one end 31a of the left interlocking rod 31 to be displaced in the direction along the axial center of the connecting shaft 26 with respect to the first shaft part 26a. Specifically, as shown in Figs. 4 and 6, the left connecting flexible part 27 is configured by making the length of the first shaft part 26a in the direction along the axial center of the connecting shaft 26 longer than the thickness of one end 31a of the left interlocking rod 31 and making the left connecting hole 36 into a left long hole that is long in the direction along the axial center of the left interlocking rod 31.

[0050] As shown in FIG. 6, a second shaft portion 26b on which one end portion 41a of the right link 41 is externally fitted among the connecting shafts 26, and the right link 41 are provided with a right connecting flexible portion 28 that allows the one end portion 41a of the right link 41 to be displaced in a direction along the axis of the connecting shaft 26 with respect to the second shaft portion 26b. Specifically, as shown in FIGS. 4 and 6, the right connecting flexible portion 28 is configured by making the length of the second shaft portion 26b in the direction along the axis of the connecting shaft 26 longer than the thickness of the one end portion 41a, and making the right connecting hole 46 into a long hole that is long in the direction along the axis of the right link 41.

[0051] As shown in FIG. 6, a flange portion 26c that protrudes outward in the diameter direction of the connecting shaft 26 is provided between the first shaft portion 26a and the second shaft portion 26b. The flange portion 26c is configured to separate the one end portion 31a of the left link 31 and the one end portion 41a of the right link 41 in the direction along the axis of the connecting shaft 26 even when the one end portion 31a of the left link 31 and the one end portion 41a of the right link 41 approach each other.

[0052] As shown in FIG. 6, the first shaft portion 26a, the second shaft portion 26b, and the flange portion 26c are constituted by a bush member 29 that is externally fitted to the connecting shaft 26. The bush member 29 is made of resin. The bush member 29 is divided into two split bush members 29a and 29b in the direction along the axis of the connecting shaft 26. One of the two split bush members 29a and 29b, i.e., the split bush member 2a, is provided with the first shaft portion 26a and a split flange portion that is connected to the first shaft portion 26a among the flange portions 26c. The other split bush member 2b of the two split bush members 29a and 29b is provided with the second shaft portion 26b and a split flange portion that is connected to the second shaft portion 26b among the flange portions 26c. In the present embodiment, the bush member 29 is divided into two split bush members 29a and 29b, but as the bush member 29, it is possible to adopt a bush member that is not divided.

[0053] In this embodiment, one end 31a of the left linkage rod 31 and one end 41a of the right linkage rod 41 are supported by the same connecting shaft 26. However, the sector gear 23 may be separately provided with a left connecting shaft and a right connecting shaft, and one end 31a of the left linkage rod 31 may be supported by the left connecting shaft, and one end 41a of the right linkage rod 41 may be supported by the right connecting shaft.

[0054] 〔Interlocking flexible part〕 As shown in FIG. 3, the left interlocking mechanism 30 is provided with a left interlocking flexible part 35. When the right interlocking mechanism 40 transmits the rolling operation force of the sector gear 23 to the right lateral part 19b, the left interlocking flexible part 35 allows the relative movement between the sector gear 23 and the left interlocking mechanism 30, and is configured such that the rolling operation force of the sector gear 23 is not transmitted to the left lateral part 19a. The right interlocking mechanism 40 is provided with a right interlocking flexible part 45. When the left interlocking mechanism 30 transmits the rolling operation force of the sector gear 23 to the left lateral part 19a, the right interlocking flexible part 45 allows the relative movement between the sector gear 23 and the right interlocking mechanism 40, and is configured such that the rolling operation force of the sector gear 23 is not transmitted to the right lateral part 19b.

[0055] Specifically, as shown in FIGS. 3 and 4, the left interlocking flexible part 35 includes a left connecting hole 36 provided at one end 31a of the left linkage rod 31. The left connecting hole 36 is formed as a left long hole that is long in the direction along the axis of the left linkage rod 31. The sector gear 23 is configured to slidably engage with the left connecting hole 36. The slidable engagement of the sector gear 23 with the left connecting hole 36 is performed by slidably engaging the connecting shaft 26 with the left connecting hole 36 (left long hole).

[0056] As shown in FIGS. 3 and 4, the right interlocking flexible part 45 includes a right connecting hole 46 provided at one end 41a of the right linkage rod 41. The right connecting hole 46 is formed as a right long hole that is long in the direction along the axis of the right linkage rod 41. The sector gear 23 is configured to slidably engage with the right connecting hole 46. The slidable engagement of the sector gear 23 with the right connecting hole 46 is performed by slidably engaging the connecting shaft 26 with the right connecting hole 46 (left long hole).

[0057] When the sector gear 23 is operated in the swinging direction indicated by the arrow A (see Fig. 3), when the connecting shaft 26 is located at the left end of the left connecting hole 36 (left elongated hole), the left interlocking lever 31 is pushed leftward of the machine body by the connecting shaft 26, and the rolling operation force of the sector gear 23 is transmitted to the left lateral part 19a by the left interlocking mechanism 30. At this time, the connecting shaft 26 moves the right connecting hole 46 (right elongated hole) of the right interlocking lever 41 leftward of the machine body, the rolling operation force of the sector gear 23 is not transmitted to the right interlocking lever 41, and the rolling operation force of the sector gear 23 is not transmitted to the right lateral part 19b.

[0058] When the sector gear 23 is operated in the swinging direction indicated by the arrow B (see Fig. 3), when the connecting shaft 26 is located at the right end of the right connecting hole 46 (right elongated hole), the right interlocking lever 41 is pushed rightward of the machine body by the connecting shaft 26, and the rolling operation force of the sector gear 23 is transmitted to the right lateral part 19b by the right interlocking mechanism 40. At this time, the connecting shaft 26 moves the left connecting hole 36 (left elongated hole) of the left interlocking lever 31 rightward of the machine body, the rolling operation force of the sector gear 23 is not transmitted to the left interlocking lever 31, and the rolling operation force of the sector gear 23 is not transmitted to the left lateral part 19a.

[0059] In this embodiment, the left interlocking flexible part 35 is provided with a left connecting hole 36 (left elongated hole) on one end 31a of the left interlocking lever 31 with which the sector gear 23 slidably engages, but the sector gear 23 (rolling operation part) may be provided with a left elongated hole with which one end 31a of the left interlocking lever 31 slidably engages. In this embodiment, the right interlocking flexible part 45 is provided with a right connecting hole 46 (right elongated hole) on one end 41a of the right interlocking lever 41 with which the sector gear 23 slidably engages, but the sector gear 23 (rolling operation part) may be provided with a right elongated hole with which one end 41a of the right interlocking lever 41 slidably engages.

[0060] 〔Operation position detection mechanism〕 As shown in Figs. 5, 6, and 7, an operation position detection mechanism 50 for detecting the operation position of the sector gear 23 is provided across the sector gear 23 and the operation case 25.

[0061] As shown in FIGS. 5, 6, and 7, the operation position detection mechanism 50 includes magnetic generation portions 52 provided at two locations on the sector gear 23 and a magnetic sensor 51 provided on the operation case 25. The two magnetic generation portions 52 are constituted by magnets attached to the sector gear 23. The magnetic sensor 51 is housed in the operation case 25 as shown in FIGS. 6 and 7. A detection port 53 that enables detection of the magnetic generation portion 52 by the magnetic sensor 51 is opened in the first outer peripheral portion 25a of the operation case 25.

[0062] As shown in FIGS. 5 and 6, the sector gear 23 is supported by the first outer peripheral portion 25a of the outer peripheral portion of the operation case 25. As shown in FIGS. 5 and 7, the electric wire 54 extending from the magnetic sensor 51 toward the control device 21 is provided at a side surface portion 25c as a second outer peripheral portion facing a direction different from the direction in which the first outer peripheral portion 25a of the outer peripheral portion of the operation case 25 faces. It exits the operation case 25 from a lead-out port 55 provided in the side surface portion 25c and is wired along the side surface portion 25c.

[0063] In the operation position detection mechanism 50, when the sector gear 23 is swung and one of the two magnetic generation portions 52 of the two magnetic generation portions 52 faces the magnetic sensor 51 through the detection port 53 and the magnetic generation portion 52 is detected by the magnetic sensor 51, it is detected that the sector gear 23 is located at an operation position that is one of the operation limits of the swing operation range. When the other magnetic generation portion 52 of the two magnetic generation portions 52 faces the magnetic sensor 51 through the detection port 53 and the magnetic generation portion 52 is detected by the magnetic sensor 51, it is detected that the sector gear 23 is located at an operation position that is the other operation limit of the swing operation range. An electric signal as a detection result is transmitted from the magnetic sensor 51 to the control device 21.

[0064] In the present embodiment, the magnetic generation portions 52 are provided at two locations on the sector gear 23, but the magnetic generation portions 52 may be provided at three or more locations to detect three or more operation positions of the sector gear 23.

[0065] In the rolling operation mechanism 20, when the sector gear 23 is in the neutral state, even if an operating force in the direction of swinging it acts on the seedling planting device 10, the left coil spring 32 and the right coil spring 42 oppose it with elastic restoring forces, and the wobbling of the seedling planting device 10 is suppressed by the left coil spring 32 and the right coil spring 42.

[0066] The rolling motor 24 is controlled by the control device 21, and the sector gear 23 is operated in the swinging direction (left swinging direction) indicated by the arrow A or the swinging direction (right swinging direction) indicated by the arrow B by the rolling motor 24. The swinging operation of the sector gear 23 in the swinging direction (left swinging direction) indicated by the arrow A and the swinging operation of the sector gear 23 in the swinging direction (right swinging direction) indicated by the arrow B are performed until the tilt angle sensor 22 detects that the left and right postures of the seedling planting device 10 have become horizontal or a posture close to horizontal. The swinging operation of the sector gear 23 in the swinging direction (left swinging direction) indicated by the arrow A can be performed until it is detected by one of the two magnetic generating portions 52 of the two magnetic generating portions 52 and the magnetic sensor 51 in the operation position detecting mechanism 50 that the sector gear 23 has reached the operation position at the limit of the swinging operation. The swinging operation of the sector gear 23 in the swinging direction (right swinging direction) indicated by the arrow B can be performed until it is detected by the other magnetic generating portion 52 of the two magnetic generating portions 52 and the magnetic sensor 51 in the operation position detecting mechanism 50 that the sector gear 23 has reached the operation position at the limit of the swinging operation.

[0067] As shown in Fig. 9, when the sector gear 23 is rocked in the left rocking direction, the rolling operation force of the sector gear 23 is transmitted to the left lateral portion 19a by the left interlocking mechanism 30. That is, the left interlocking rod 31 is pushed in the left direction of the machine body by the connecting shaft 26, the rolling operation force of the sector gear 23 is transmitted from the left interlocking rod 31 to the left coil spring 32, and is transmitted from the left coil spring 32 to the left connecting member 33, and the left lateral portion 19a is pushed by the left connecting member 33, and a rolling operation is performed to roll the seedling planting device 10 counterclockwise with the machine body longitudinal axis X as the rolling fulcrum. The left coil spring 32 transmits the rolling operation force to the left connecting member 33 while being slightly compressed and deformed by the rolling operation force of the sector gear 23, and the sector gear 23 and the left lateral portion 19a are interlocked in a state where there is a slight interlocking flexibility. When the counterclockwise rolling operation of the seedling planting device 10 is performed, due to the action of the right interlocking flexibility portion 45, the rolling operation force of the sector gear 23 is not transmitted to the right interlocking rod 41 and is not transmitted to the right lateral portion 19b, and the load for lifting the right side of the seedling planting device 10 is not applied to the sector gear 23. However, when the seedling planting device 10 is rolled counterclockwise, with this rolling operation, the right lateral portion 19b of the seedling planting device 10 rises and rocks, and the right interlocking rod 41 is pushed toward the sector gear 23 through the right connecting member 43 and the right coil spring 42 by the right lateral portion 19b, and the connecting shaft 26 is in a state of being located at the right end side portion in the right connecting hole 46 (right long hole) of the right interlocking rod 41.

[0068] When the sector gear 23 is rocked in the right rocking direction, the rolling operation force of the sector gear 23 is transmitted to the right lateral portion 19b by the right interlocking mechanism 40. That is, the right interlocking rod 41 is pushed in the right direction of the machine body by the connecting shaft 26, the rolling operation force of the sector gear 23 is transmitted from the right interlocking rod 41 to the right coil spring 42, and is transmitted from the right coil spring 42 to the right connecting member 43, and the right lateral portion 19b is pushed by the right connecting member 43, and a rolling operation is performed to roll the seedling planting device 10 in the right direction with the machine body longitudinal axis X as the rolling fulcrum. The right coil spring 42 transmits the rolling operation force to the right connecting member 43 while being slightly compressed and deformed by the rolling operation force of the sector gear 23, and the sector gear 23 and the left lateral portion 19a are interlocked in a state where there is a slight interlocking flexibility. When the rolling operation of the seedling planting device 10 in the right direction is performed, the rolling operation force of the sector gear 23 is not transmitted to the left interlocking rod 31 and is not transmitted to the left lateral portion 19a due to the action of the left interlocking flexibility portion 35, and the load for lifting the left lateral side of the seedling planting device 10 is not applied to the sector gear 23. However, when the seedling planting device 10 is rolled in the right direction, the left lateral portion 19a of the seedling planting device 10 rises and rocks along with this rolling operation, and the left interlocking rod 31 is pushed toward the sector gear 23 through the left connecting member 33 and the left coil spring 32 by the left lateral portion 19a, and the connecting shaft 26 is in a state of being located at the left end side portion in the left connecting hole 36 (left long hole) of the left interlocking rod 31.

[0069] When the sector gear 23 is rocked, an operating force that tilts the left link 31 and the right link 41 with respect to the posture of the sector gear 23 in the neutral state acts on the left link 31 and the right link 41 due to, for example, the connecting shaft 26 that supports one end 31a of the left link 31 and one end 41a of the right link 41 moving in the front-rear direction. However, the left connecting flexible portion 27 allows one end 31a of the left link 31 to shift with respect to the first shaft portion 26a, and the left connecting flexible portion 27 prevents the left link mechanism 30 from assuming an unreasonable posture. The right connecting flexible portion 28 allows one end 41a of the right link 41 to shift with respect to the second shaft portion 26b, and the right connecting flexible portion 28 prevents the right link mechanism 40 from assuming an unreasonable posture. Even if one end 31a of the left link 31 and one end 41a of the right link 41 shift, one end 31a of the left link 31 and one end 41a of the right link 41 are separated by the flange portion 26c so that the left link 31 and the right link 41 do not hit each other.

[0070] 〔Resilience Adjusting Portion〕 As shown in FIG. 4, the left link mechanism 30 is provided with a left resilience adjusting portion 37 and is configured such that the elastic restoring force of the left coil spring 32 in the neutral state of the sector gear 23 can be adjusted by the left resilience adjusting portion 37.

[0071] Specifically, as shown in FIG. 4, the left resilience adjusting portion 37 is configured such that the left connecting member 33 is detachably connected to the left lateral portion 19a by a connecting bolt 38, and a plurality of mounting holes 39 for replacing the connecting bolt 38 are provided along the left-right direction of the machine body in a state of being arranged side by side on the left lateral portion 19a.

[0072] In the left restoring force adjusting section 37, by replacing the connecting bolt 38 with a selected mounting hole 39 from a plurality of mounting holes 39 to change the connection position of the left connecting member 33 in the left lateral portion 19a, the distance between the spring receiving portion 31c of the left link rod 31 and the spring receiving portion 33b of the left connecting member 33 is changed, the compression elastic deformation amount of the left coil spring 32 is changed, and the restoring force of the left coil spring 32 is adjusted. When adjusting the elastic restoring force of the left coil spring 32, the screw hole member 31e engaged with the rod portion 31L of the left link rod 31 is rotationally adjusted on the side opposite to the side where the left coil spring 32 is located with respect to the spring receiving portion 33b of the left connecting member 33, and the length of the rod portion 31L protruding from the spring receiving portion 33b to the side opposite to the left coil spring side is adjusted. That is, regardless of the change in the distance between the spring receiving portion 31c and the spring receiving portion 33b, the connecting shaft 26 is adjusted to be located at the end on the left coil spring side (left side) in the left connecting hole 36 (left long hole) of the left link rod 31 in the neutral state of the sector gear 23.

[0073] As shown in FIG. 4, the right link mechanism 40 is provided with a right restoring force adjusting section 47, and is configured such that the elastic restoring force of the right coil spring 42 in the neutral state of the sector gear 23 can be adjusted by the right restoring force adjusting section 47.

[0074] Specifically, as shown in FIG. 4, the right restoring force adjusting section 47 is configured such that the right connecting member 43 is detachably connected to the right lateral portion 19b by a connecting bolt 48, similar to the left restoring force adjusting section 37, and a plurality of mounting holes 49 for replacing the connecting bolt 48 are provided in the right lateral portion 19b in a state of being arranged along the left - right direction of the machine body.

[0075] In the right restoring force adjusting section 47, by replacing the connecting bolt 48 with a mounting hole 49 selected from a plurality of mounting holes 49 to change the connection position of the right connecting member 43 in the right lateral portion 19b, the interval between the spring receiving portion 41c of the right link rod 41 and the spring receiving portion 43b of the right connecting member 43 is changed, the compression elastic deformation amount of the right coil spring 42 is changed, and the restoring force of the right coil spring 42 is adjusted. When adjusting the elastic restoring force of the right coil spring 42, the screw hole member 41e engaged with the rod portion 41L of the right link rod 41 is rotationally adjusted on the side opposite to the side where the right coil spring 42 is located with respect to the spring receiving portion 43b of the right connecting member 43, and the length by which the rod portion 41L protrudes from the spring receiving portion 43b to the side opposite to the right coil spring side is adjusted. That is, regardless of the change in the interval between the spring receiving portion 41c and the spring receiving portion 43b, the connecting shaft 26 is adjusted to be positioned at the end on the right coil spring side (right side) in the right connecting hole 46 (left long hole) of the right link rod 41 in the neutral state of the sector gear 23.

[0076] In the present embodiment, as the left restoring force adjusting section 37, a configuration for adjusting the position of the left connecting member 33 in the left lateral portion 19a is adopted, but a configuration for adjusting the position of the spring receiving portion 33b in the left connecting member 33 or a configuration for adjusting the position of the spring receiving portion 31c in the left link rod 31 can be adopted. In the present embodiment, as the right restoring force adjusting section 47, a configuration for adjusting the position of the right connecting member 43 in the right lateral portion 19b is adopted, but a configuration for adjusting the position of the spring receiving portion 43b in the right connecting member 43 or a configuration for adjusting the position of the spring receiving portion 41c in the right link rod 41 can be adopted.

[0077] 〔Alternative Embodiment〕 In the above-described embodiment, an example in which a seedling planting device is adopted as the ground working device is shown, but as the ground working device, a device that performs various ground operations such as a seeding operation for sowing various seeds such as rice and wheat in a field or a fertilizing operation for spreading fertilizer in a field may be adopted.

Industrial Applicability

[0078] The present invention can be applied to a working machine including a ground working device rollably connected to a traveling body about a longitudinal axis of the body, and a rolling operation mechanism for rolling the ground working device.

Explanation of Signs

[0079] 3 Traveling body 8a Rear link (portion on the traveling body side) 8c Upper link 8d Lower link 10 Seedling planting device (ground working device) 19a Left lateral portion 19b Right lateral portion 20 Rolling operation mechanism 23 Sector gear (rolling operation portion) 24 Rolling motor (rolling actuator) 26 Connecting shaft 25 Operation case (support portion) 25a First outer peripheral portion 25c Side portion (second outer peripheral portion) 30 Left interlocking mechanism 31 Left interlocking rod 31c Spring receiving portion 32 Left coil spring (left elastic member) 33 Left connecting member 33b Spring receiving portion 35 Left interlocking accommodation portion 36 Left connecting hole (left elongated hole) 37 Left restoring force adjusting portion 40 Right interlocking mechanism 41 Right interlocking rod 41c Spring receiving portion 42 Right coil spring (right elastic member) 43 Right connecting member 43b Spring receiving portion 45 Right interlocking accommodation portion 46 Right connecting hole (right elongated hole) 47 Right restoring force adjusting portion 51 Magnetic sensor 52 Magnetic generating portion 54 Electric wire

Claims

1. A traveling body, a ground working device connected to the traveling body so as to be rollable about an axis in the longitudinal direction of the body, and a rolling operation mechanism for rolling the ground working device, wherein the rolling operation mechanism includes a rolling operation part supported on the traveling body side so as to be displaceable in the left - right direction of the body, a rolling actuator for displacing the rolling operation part, a left interlocking mechanism for interlocking the rolling operation part with the left - hand side part of the ground working device via a left elastic member, and a right interlocking mechanism for interlocking the rolling operation part with the right - hand side part of the ground working device via a right elastic member, the left elastic member has an elastic restoring force in a direction separating the rolling operation part and the left - hand side part of the ground working device in a neutral state of the rolling operation part, and the right elastic member has an elastic restoring force in a direction separating the rolling operation part and the right - hand side part of the ground working device in a neutral state of the rolling operation part.

2. The working machine according to claim 1, further comprising a left restoring force adjusting part for adjusting the elastic restoring force of the left elastic member, and a right restoring force adjusting part for adjusting the elastic restoring force of the right elastic member.

3. The left interlocking mechanism includes a left interlocking rod having one end connected to the rolling operation part, and a left connecting member connected to the left - hand side part while slidably supporting the other end of the left interlocking rod, the left elastic member is a left coil spring externally fitted to the left interlocking rod while being sandwiched between a spring receiving part provided at one end of the left interlocking rod and a spring receiving part provided at the left connecting member, the left restoring force adjusting part is configured to change the amount of elastic compression deformation of the left coil spring by changing the distance between the spring receiving part of the left interlocking rod and the spring receiving part of the left connecting member, the right interlocking mechanism includes a right interlocking rod having one end connected to the rolling operation part, and a right connecting member connected to the right - hand side part while slidably supporting the other end of the right interlocking rod, and the right elastic member is a right coil spring externally fitted to the right interlocking rod while being sandwiched between a spring receiving part provided at one end of the right interlocking rod and a spring receiving part provided at the right connecting member. The right restoring force adjusting portion is configured to change the amount of compressive elastic deformation of the right coil spring by changing the distance between the spring receiving portion of the right link rod and the spring receiving portion of the right connecting member. The working machine according to claim 2.

4. When the left interlocking mechanism transmits the rolling operation force of the rolling operation portion to the left lateral portion, a right interlocking accommodation portion that allows relative movement between the rolling operation portion and the right interlocking mechanism is provided. When the right interlocking mechanism transmits the rolling operation force of the rolling operation portion to the right lateral portion, a left interlocking accommodation portion that allows relative movement between the rolling operation portion and the left interlocking mechanism is provided. The working machine according to any one of claims 1 to 3.

5. The left interlocking mechanism is provided with a left link rod having one end connected to the rolling operation portion. The left interlocking accommodation portion is provided on one of the one end of the left link rod and the rolling operation portion, and includes a left long hole in which the other of the one end of the left link rod and the rolling operation portion slidably engages. The right interlocking mechanism is provided with a right link rod having one end connected to the rolling operation portion. The right interlocking accommodation portion is provided on one of the one end of the right link rod and the rolling operation portion, and includes a right long hole in which the other of the one end of the right link rod and the rolling operation portion slidably engages. The working machine according to claim 4.

6. A plurality of magnetic generating portions provided at a plurality of locations of the rolling operation portion, and a magnetic sensor that detects the operation position of the rolling operation portion by detecting each of the plurality of magnetic generating portions are provided. The working machine according to any one of claims 1 to 5.

7. An upper link and a lower link that extend swingably up and down from the traveling body, and a rear link that is connected to the free end of the upper link and the free end of the lower link and supports the ground working device so as to be rollable. A link mechanism that connects the ground working device to the traveling body so as to be liftable and lowerable is provided. The operation case that houses the magnetic sensor is supported by the rear link. The working machine according to claim 6.

8. The rolling operation portion is supported by a first outer peripheral portion of the outer peripheral portion of the operation case. The working machine according to claim 7, wherein an electric wire extending from the magnetic sensor is routed along a second outer peripheral portion of the outer peripheral portion of the operation case, the second outer peripheral portion facing a direction different from the direction in which the first outer peripheral portion faces.

9. The working machine according to claim 7 or 8, wherein the operation case is supported by the rear link in a state of being located along the upper link above the upper link when the ground working device is in the lowest lowering operation position.

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