JP7699535B2 - Work Machine - Google Patents

Description

The present invention relates to a work machine equipped with a traveling body, a ground work device connected to the traveling body so as to be capable of rolling around the longitudinal axis of the body, and a rolling operation mechanism for rolling the ground work device.

The above-mentioned working machine has a rolling operation mechanism that includes a rolling operation unit supported on the traveling machine body side so that it can be displaced left and right along the machine body, a rolling actuator that displaces the rolling operation unit, a left interlocking mechanism that interlocks the rolling operation unit with the left side part of the ground work device via a left elastic member, and a right interlocking mechanism that interlocks the rolling operation unit with the right side part of the ground work device via a right elastic member.

One example of this type of working machine is the riding rice transplanter shown in Patent Document 1. This riding rice transplanter is equipped with a ground work device (seedling planting device) that is connected to the traveling body so that it can roll. It is equipped with a rolling operation unit (drive arm) that is supported on the traveling body side (rear link member) so that it can be displaced in the left-right direction of the body, a rolling actuator (rolling motor) that displaces the rolling operation unit, a left interlocking mechanism that interlocks the rolling operation unit with the left side part of the ground work device (left part of the horizontal frame) via a left elastic member (flexible spring), and a right interlocking mechanism that interlocks the rolling operation unit with the right side part of the ground work device (right part of the horizontal frame) via a right elastic member (flexible spring).

JP 2015-177753 A

Conventionally, when the rolling operation unit is in a neutral position and an operating force acts on the ground work device in a direction that causes it to swing, even a weak operating force such as that caused by vibration transmitted from the traveling machine body to the ground work device can cause the ground work device to wobble, resulting in poor work finish for the ground work device, such as different seedling planting depths on the left and right sides of the seedling planting device.

The present invention provides a work machine that can prevent the ground work device from wobbling when the rolling operation unit is in the neutral state.

The working machine according to the present invention comprises:
The ground work device is provided with a traveling body, a ground work device connected to the traveling body so as to be rollable around a longitudinal axis of the body, and a rolling operation mechanism for rolling the ground work device, the rolling operation mechanism being provided with a rolling operation section supported on a portion 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 section, a left interlocking mechanism for interlocking the rolling operation section with a left lateral portion of the ground work device via a left elastic member, and a right interlocking mechanism for interlocking the rolling operation section with a right lateral portion of the ground work device via a right elastic member , the left elastic member having an elastic restoring force in a direction separating the rolling operation section and the left lateral portion of the ground work device when the rolling operation section is in a neutral state, and the right elastic member having an elastic restoring force in a direction separating the rolling operation section and the right lateral portion of the ground work device when the rolling operation section is in a neutral state .

According to this configuration, the left elastic member or the right elastic member resists the operating force that swings the ground work device while retaining an elastic restoring force, so even if an operating force acts on the ground work device in a direction that swings it, the ground work device will not swing if the operating force is weak enough for the left elastic member and the right elastic member to resist. In other words, when the rolling operating force of the rolling operating unit is transmitted to the ground work device, the elastic deformation of the left elastic member and the right elastic member can generate some interlocking flexibility, while making it difficult for the ground work device to wobble when the rolling operating unit is in a neutral state.

In the present invention,
It is preferable that a left restoring force adjustment section capable of adjusting the elastic restoring force of the left elastic member is provided, and a right restoring force adjustment section capable of adjusting the elastic restoring force of the right elastic member is provided.

With this configuration, the elastic restoring forces of the left and right elastic members can be adjusted, so that even if the load on the left side and the right side of the ground work device are different, the elastic restoring force of the left elastic member can be adjusted to a strength appropriate for the load on the left side, and the elastic restoring force of the right elastic member can be adjusted to a strength appropriate for the load on the right side, making the ground work device less likely to wobble.

In the present invention,
The left interlocking mechanism includes a left interlocking rod having one end connected to the rolling operation unit, 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 being a left coil spring fitted onto the left interlocking rod in a state of being sandwiched between a spring receiving portion provided at one end of the left interlocking rod and a spring receiving portion provided on the left connecting member, the left restoring force adjustment portion being configured to change an amount of compressive elastic deformation of the left coil spring by changing a distance between the spring receiving portion of the left interlocking rod and the spring receiving portion of the left connecting member, It is preferable that the moving mechanism includes a right interlocking rod having one end connected to the rolling operation unit, and a right connecting member connected to the right side portion in a state where it slidably supports the other end of the right interlocking rod, the right elastic member being a right coil spring that is fitted onto the right interlocking rod in a state where it is sandwiched between a spring receiving portion provided on one end of the right interlocking rod and a spring receiving portion provided on the right connecting member, and the right restoring force adjustment unit 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.

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 the left coil spring has an elastic restoring force and the left connecting member is pushed, so that the rolling operation force of the rolling operation unit is transmitted to the left side 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 the right coil spring has an elastic restoring force and the right connecting member is pushed, so that the rolling operation force of the rolling operation unit is transmitted to the right side part, so that the rolling operation force of the rolling operation unit can be securely transmitted to the left and right side parts.

Because the left elastic member is a left coil spring, the structure of the left restoring force adjustment section 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.Because the right elastic member is a right coil spring, the structure of the right restoring force adjustment section 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.

In the present invention,
It is preferable that a right interlocking mechanism is provided which allows relative movement between the rolling operation unit and the right interlocking mechanism when the left interlocking mechanism transmits the rolling operation force of the rolling operation unit to the left lateral side portion, and that a left interlocking mechanism is provided which allows relative movement between the rolling operation unit and the left interlocking mechanism when the right interlocking mechanism transmits the rolling operation force of the rolling operation unit to the right lateral side portion.

According to this configuration, when the rolling operation force of the rolling operation unit is transmitted to the left side portion to perform the rolling operation of the ground work device, the rolling operation unit and the right interlocking mechanism move relative to each other by the right interlocking interchangeable part, so that the load on the right side of the ground work device is not applied to the rolling operation unit, and when the rolling operation force of the rolling operation unit is transmitted to the right side portion to perform the rolling operation of the ground work device, the rolling operation unit and the left interlocking mechanism move relative to each other by the left interlocking interchangeable part, so that the load on the left side of the ground work device is not applied to the rolling operation unit, so that when the rolling operation force of the rolling operation unit is transmitted to the left side portion, the load on the right side of the ground work device is applied to the rolling operation unit, and when the rolling operation force of the rolling operation unit is transmitted to the right side portion, the load on the left side of the ground work device is applied to the rolling operation unit. It is possible to employ a rolling actuator with smaller output than one in which the load on the right side of the ground work device is applied to the rolling operation unit when the rolling operation force of the rolling operation unit is transmitted to the left side portion.

In the present invention,
It is preferable that the left interlocking mechanism is provided with a left interlocking rod, one end of which is connected to the rolling operation unit, the left interlocking accommodation unit is provided on one of the one end of the left interlocking rod and the rolling operation unit, and has a left long hole with which the one end of the left interlocking rod and the rolling operation unit are slidably engaged, and the right interlocking mechanism is provided with a right interlocking rod, one end of which is connected to the rolling operation unit, and the right interlocking accommodation unit is provided on one of the one end of the right interlocking rod and the rolling operation unit, and has a right long hole with which the one end of the right interlocking rod and the rolling operation unit are slidably engaged.

According to this configuration, a left interlocking section can be obtained by a simple structure in which one end of the left interlocking rod and one of the rolling operation parts are provided with a left long hole with which one end of the left interlocking rod and the other of the rolling operation part can slidably engage. A right interlocking section can be obtained by a simple structure in which one end of the right interlocking rod and one of the rolling operation parts are provided with a right long hole with which one end of the right interlocking rod and the other of the rolling operation part can slidably engage.

In the present invention,
It is preferable that the rolling operation unit be provided with a plurality of magnetic field generating units provided at a plurality of locations, and a magnetic sensor that detects the operation position of the rolling operation unit by detecting each of the plurality of magnetic field generating units.

With this configuration, multiple operating positions of the rolling operation unit are detected by a smaller number of magnetic sensors than the multiple magnetic generating units, so multiple operating positions of the rolling operation unit can be detected by a detection mechanism with a simple structure that includes a small number of magnetic sensors.

In the present invention,
It is preferable that a link mechanism is provided which has upper and lower links extending from the traveling body so as to be able to swing up and down, a rear link which is connected to the free end of the upper link and the free end of the lower link and which supports the ground work device so as to be able to roll, and which connects the ground work device to the traveling body so that it can be raised and lowered, and an operating case which houses the magnetic sensor is supported by the rear link.

With this configuration, the rear link is used as a support member for the operation case, making it possible to simplify the support structure for the operation case.

In the present invention,
The work machine described in claim 8, wherein the rolling operation unit is supported by a first outer circumferential portion of the outer periphery of the operation case, and an electric wire extending from the magnetic sensor is wired along a second outer circumferential portion of the outer periphery of the operation case that faces in a direction different from the direction in which the first outer circumferential portion faces.

With this configuration, compared to wiring the electric wires around the first outer periphery, there is no need to take care that the electric wires do not come into contact with the rolling operation part, which is a movable member, making wiring the electric wires easier.

In the present invention,
It is preferable that the operating case be supported by the rear link in a state in which the operating case is located above and along the upper link when the ground work apparatus is located at the lowest operating position.

With this configuration, the height of the space that needs to be provided above the upper link to position the operating case on the upper link can be made lower than if the operating case were positioned above the upper link in a non-parallel orientation to the upper link, so even if the equipment part of the ground work device is located above the upper link, it is easy to install the operating case in the space between the upper link and the equipment part.

FIG. 2 is a side view of a riding rice transplanter. FIG. FIG. FIG. 4 is an exploded view of the left interlocking mechanism and the right interlocking mechanism. FIG. 2 is a side view showing a sector gear, a rolling motor and an operating case. 4 is a cross-sectional view showing a support structure for a sector gear, a left interlocking rod and a right interlocking rod. FIG. FIG. 13 is a bottom view showing the magnetic sensor and the sector gear. FIG. 4 is a schematic diagram of a rolling operation mechanism in a neutral state. FIG. 13 is an explanatory diagram of a rolling operation.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following explanation, with regard to the running body of a riding rice transplanter (an example of a "working machine"), the direction of arrow F shown in Figures 1 and 2 etc. is referred to as the "forward direction of the body," the direction of arrow B as the "rearward direction of the body," the direction of arrow U as the "upward direction of the body," the direction of arrow D as the "downward direction of the body," the direction of L shown in Figure 2 as the "leftward direction of the body," and the direction of arrow R as the "rightward direction of the body."

[Overall view of riding rice transplanter]
As shown in FIG. 1, the riding rice transplanter has a running body 3 provided with a pair of left and right front wheels 1 that can be swivelled, steered, and driven, and a pair of left and right rear wheels 2 that can be driven.
A driving section 4 equipped with an engine (not shown) is formed at the front of the traveling body 3. A driving section 5 is formed at the rear of the traveling body 3. The driving section 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 of the traveling body 3. The seedling planting device 10 is connected to the traveling body 3 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 of the traveling body 3. The link mechanism 8 is supported by the machine frame 9 so as to be able to swing up and down. The link mechanism 8 is equipped with a lifting cylinder 8b connected to the machine frame 9 and the rear link 8a of the link mechanism 8. The seedling planting device 10 is lifted and lowered between a lowered working state and an elevated non-working state by lifting and lowering the link mechanism 8 by the extension and contraction operation of the lifting cylinder 8b.

[Seedling planting device]
1 and 2, the seedling planting device 10 is provided with a device frame 11 having a main frame 11a extending in the left-right direction of the device and a plurality of planting drive cases 11b extending from a plurality of positions in the left-right direction of the main frame 11a toward the rear of the device. A seedling planting mechanism 12 is drivably supported on both sides of the rear of each planting drive case 11b.
In this embodiment, four planting drive cases 11b and eight seedling planting mechanisms 12 are provided, but three or less or four or more planting drive cases 11b and seven or less or nine or more seedling planting mechanisms 12 may be provided. A seedling carrier 13 is supported in a rearwardly downwardly inclined position at the front of the device frame 11. The seedling carrier 13 is supported so as to be reciprocally slidable in the left-right direction of the device in a state in which it has eight seedling placement sections 13a for placing seedlings to be supplied to the eight seedling planting mechanisms 12. A sliding guide rail 14 that slidably guides the lower part of the seedling carrier 13 is supported by the device frame 11. A seedling removal port 15 is provided at a portion 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 left-right direction of the device are supported at the lower part of the device frame 11.

In the seedling planting device 10, power from the engine is input to the feed case 17 (see FIG. 2) provided at the front of the device frame 11 by the rotating shaft 18 (see FIG. 1), and the input power is transmitted from the feed case 17 to each planting drive case 11b, and the two seedling planting mechanisms 12 in 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, it alternately takes out seedlings from the seedling placement section 13a at the seedling removal port 15 by a pair of seedling planting claws 12a (see FIG. 1), transports the taken seedlings down to the field, and performs a seedling planting movement in which the seedlings are planted in the area of the field that has been leveled by the ground float 16. The seedling carrier 13 is moved back and forth in the left and right directions of the device by a seedling lateral feed mechanism (not shown) that is provided between the seedling carrier 13 and the feed case 17, and is guided by a sliding guide rail 14 in conjunction with the seedling planting movement of the seedling planting mechanism 12, and moves the seedlings placed on the seedling placement section 13a back and forth in the left and right directions of the device relative to the seedling removal opening 15. The seedling removal by the seedling planting claws 12a of each seedling planting mechanism 12 is performed sequentially from one end to the other end in the width direction of the seedlings placed on the seedling placement section 13a.

[Rolling control of seedling planting device]
The seedling planting device 10 is connected to the traveling body 3 in a state in which it can roll around the axis X (see FIG. 2) of the machine body in the fore-and-aft direction. Specifically, as shown in FIG. 1, the link mechanism 8 provided at the rear of the traveling body 3 has an upper link 8c and a lower link 8d that extend from the machine body frame 9 toward the rear of the machine body so as to be able to swing up and down, and a rear link 8a that is connected to the free end of the upper link 8c and the free end of the lower link 8d. A feed case 17 is provided at the center in the left-right direction of the machine at the front of the device frame 11. The feed case 17 is supported by the rear link 8a so as to be rotatable around the axis X of the machine body in the fore-and-aft direction, and the device frame 11 is supported by the rear link 8a so as to be able to roll around the axis X of the machine body in the fore-and-aft direction.

1 and 2, a rolling operation mechanism 20 that rolls the seedling planting device 10 relative to the traveling body 3 is provided in front of the seedling carrier 13. As shown in FIG. 3, a control device 21 is linked to the rolling operation mechanism 20, and a tilt angle sensor 22 that detects the left and right tilt 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 tilt 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 and right posture of the seedling planting device 10 is horizontal or close to horizontal. Even if the traveling body 3 is tilted left and right due to unevenness of the field tillage bed, the seedling planting device 10 can perform seedling planting work with the left and right seedling planting depths being the same or almost the same. The left and right balance springs 56 shown in FIG. 2 are connected to the free end of the link mechanism 8 that supports the seedling planting device 10 and the side end portion of the seedling carrier 13, and are used to balance the weight of the left and right sides of the seedling planting device 10 regardless of the left and right movement of the seedling carrier 13.

[Rolling operation mechanism]
As shown in Fig. 3, the rolling operation mechanism 20 includes a sector gear 23 as a rolling operation part, a rolling motor 24 as a rolling actuator for swinging the sector gear 23, a left interlocking mechanism 30 for interlocking the sector gear 23 with the left side part 19a of the seedling planting device 10, and a right interlocking mechanism 40 for interlocking the sector gear 23 with the right side part 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 between the sector gear 23 and the operation case 25 as a support part for supporting the sector gear 23.

As shown in Figures 2, 3, and 4, the left side portion 19a of the seedling planting device 10 is formed by a portion of the horizontal frame 19 attached to the device frame 11, which extends along the left-right direction of the device and is located to the left of the center in the left-right direction of the machine. The right side portion 19b of the seedling planting device 10 is formed by a portion of the horizontal frame 19 located to the right of the center in the left-right direction of the machine. The horizontal frame 19 forms a support frame 11c that supports the seedling carrier 13 so that it can move in the left-right direction of the device. The support frame 11c is formed by left and right support frames 11d erected on the left and right ends of the main frame 11a, and a horizontal frame 19 erected on the top of the left and right support frames 11d.

As shown in Figures 3 and 5, the sector gear 23 is supported by the rear link 8a, which is a part on the traveling machine body side. As shown in Figures 3, 5, and 6, the sector gear 23 is supported by the rear link 8a by providing an operation case 25 as a support part on the upper part of the rear link 8a and supporting the sector gear 23 on the operation case 25. The sector gear 23 is supported by supporting the support shaft 23a of the sector gear 23 on a boss part 25b provided on the first outer circumferential part 25a of the operation case 25. The sector gear 23 is supported by the operation case 25, which is a support part of the rear link 8a, in a state in which it can be swung and displaced in the left-right direction of the machine body with the axis P of the support shaft 23a as the swing fulcrum.

The rolling motor 24 is 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 periphery 25a of the operation case 25. The sector gear 23 and the rolling motor 24 are supported on the outside of the operation case 25. In this embodiment, the sector gear 23 and the rolling motor 24 are supported on the first outer periphery 25a of the operation case 25, but the sector gear 23 and the rolling motor 24 may be supported on different outer periphery parts of the operation case 25. As shown in Figs. 5 and 6, the operation case 25 includes an upper case part 25u supported on the rear link 8a, and a lower case part 25d that is fitted from below into the upper case part 25u to close the downward opening of the upper case part 25u and form a space for accommodating the magnetic sensor 51 inside the operation case 25.

As shown in Figures 3, 5, and 6, the rolling motor 24 has 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 causes the sector gear 23 to swing and displace in the left-right direction of the vehicle body.

In this embodiment, the rolling operation unit is constituted by a sector gear 23, and the rolling actuator is constituted by a rolling motor 24 made up of an electric motor, but is not limited thereto. The rolling operation unit may be one that can slide in the left-right direction of the machine body, such as a rack of a rack and pinion. The rolling actuator may be a cylinder that operates the rolling operation unit by expanding and contracting.
In this embodiment, the support part that supports the sector gear 23 and the rolling motor 24 is constituted by the operation case 25, but the support part may be a member of any shape, such as a single plate-shaped member or a groove-shaped member.

As shown in Figures 1 and 5, when the seedling planting device 10 is in the lowest operating position, the operating case 25 is supported by the rear link 8a in a state in which it is positioned above and along the upper link 8c. When the seedling planting device 10 is in the lowest operating position, the distance between the upper link 8c and the portion 13b of the seedling carrier 13 located above the upper link 8c is the narrowest, but it is easy to install the operating case 25, the sector gear 23, and the rolling motor 24 in the space between the upper link 8c and the seedling carrier 13.

[Left linkage 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 side portion 19 a, a left coil spring 32 as a left elastic member , and a left connecting member 33, and is configured to transmit the rolling operating force of the sector gear 23 to the left lateral side portion 19 a via the left interlocking rod 31, the left coil spring 32, and the left connecting member 33.

3 and 6, one end 31a of the left interlocking rod 31 is connected to the sector gear 23. One end 31a of the left interlocking rod 31 is connected to the sector gear 23 on the side where the sector gear 23 is located relative to the operation case 25. The one end 31a of the left interlocking rod 31 is connected to the sector gear 23 by supporting the one end 31a on the connecting shaft 26 provided on the sector gear 23. The left connecting member 33 is connected to the left side portion 19a in a state in which the other end 31b of the left interlocking rod 31 is slidably supported by the support hole 33a. The left coil spring 32 is fitted to the left interlocking rod 31 in a state in which it is sandwiched between the spring receiving portion 31c provided on the one end 31a of the left interlocking rod 31 and the spring receiving portion 33b provided on the left connecting member 33. The left coil spring 32 is sandwiched between the spring bearing portion 31c of the left interlocking rod 31 and the spring bearing portion 33b of the left connecting member 33 in a state in which it has been elastically deformed in advance so as to have an elastic restoring force when the sector gear 23 is in the neutral state, i.e., in a so-called initial elastic deformation state.

As shown in Figs. 3 and 4, the left interlocking rod 31 has a plate-shaped portion 31T that forms one end 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 31b. The spring receiving portion 31c of the left interlocking rod 31 is formed by a bent end portion provided at the end of the plate-shaped portion 31T on the rod portion side. The spring receiving portion 33b of the left connecting member 33 is formed by a plate-shaped portion having a support hole 33a. The spring receiving portion 31c of the left interlocking 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 located between the spring receiving portions 31c, 33b and the end of the left coil spring 32. The spring receiving member 34 has a through hole through which the rod portion 31L is inserted.

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

3 and 6, one end 41a of the right interlocking rod 41 is connected to the sector gear 23. One end 41a of the right interlocking rod 41 is connected to the sector gear 23 on the side where the sector gear 23 is located relative to the operation case 25. The one end 41a of the right interlocking rod 41 is connected to the sector gear 23 by supporting the one end 41a on the connecting shaft 26 provided on the sector gear 23. The right connecting member 43 is connected to the right side portion 19b in a state in which the other end 41b of the right interlocking rod 41 is slidably supported by the support hole 43a. The right coil spring 42 is fitted to the right interlocking rod 41 in a state in which it is sandwiched between the spring receiving portion 41c provided on the one end 41a of the right interlocking rod 41 and the spring receiving portion 43b provided on the right connecting member 43. The right coil spring 42 is sandwiched between the spring bearing portion 41c of the right interlocking rod 41 and the spring bearing portion 43b of the right connecting member 43 in a state in which it has been elastically deformed in advance so as to have an elastic restoring force when the sector gear 23 is in the neutral state, i.e., in a so-called initial elastic deformation state.

3 and 4, the right interlocking rod 41 has a plate-shaped portion 41T forming one end 41a and a spring receiving portion 41c, and a rod portion 41L extending from the plate-shaped portion 41T toward the right connecting member 43 and forming the other end 41b. The spring receiving portion 41c of the right interlocking rod 41 is formed by a bent end portion provided at the end portion of the plate-shaped portion 41T on the rod portion side. The spring receiving portion 43b of the right connecting member 43 is formed by a plate-shaped portion having a support hole 43a. The spring receiving portion 41c of the right interlocking 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, 43b and the end of the right coil spring 42. The spring receiving member 44 has a through hole through which the rod portion 41L is inserted.

As shown in FIG. 8, in this embodiment, the distance L1 from the connecting shaft 26 to the left side portion 19a of the sector gear 23 in the neutral state is the same as the distance L2 from the connecting shaft 26 to the right side portion 19b of the sector gear 23 in the neutral state, but this is not limited to this. The left interlocking mechanism 30 and the right interlocking mechanism 40 may be configured such that the distance L1 in the left interlocking mechanism 30 and the distance L2 in the right interlocking mechanism 40 are different.

In this embodiment, the left coil spring 32 is used as the left elastic member, and the right coil spring 42 is used as the right elastic member, but this is not limited to this. As the left elastic member and the right elastic member, various elastic members such as disc springs, spiral springs, and rubber materials can be used.

[Support of left and right interlocking rods in sector gear]
3 and 6, one end 31a of the left interlocking rod 31 is supported on the sector gear 23 by providing a left connecting hole 36 (see FIG. 4) in one end 31a of the left interlocking rod 31 and fitting the one end 31a onto the connecting shaft 26 of the sector gear 23 through the left connecting hole 36. One end 41a of the right interlocking rod 41 is supported on the sector gear 23 by providing a right connecting hole 46 (see FIG. 4) in one end 41a of the right interlocking rod 41 and fitting the one end 41a onto 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 fitted onto the connecting shaft 26 while being aligned in a direction along the axis of the connecting shaft 26.

As shown in FIG. 6, a left connection flexibility portion 27 is provided between the first shaft portion 26a of the connecting shaft 26 on which the one end portion 31a of the left interlocking rod 31 fits, and the left interlocking rod 31, allowing the one end portion 31a of the left interlocking rod 31 to be displaced relative to the first shaft portion 26a in a direction along the axis of the connecting shaft 26. Specifically, as shown in FIGS. 4 and 6, the left connection flexibility portion 27 is configured by making the length of the first shaft portion 26a in the direction along the axis of the connecting shaft 26 longer than the thickness of the one end portion 31a of the left interlocking rod 31, and making the left connection hole 36 a left elongated hole that is long in the direction along the axis of the left interlocking rod 31.

As shown in FIG. 6, a right connecting portion 28 is provided between the second shaft portion 26b of the connecting shaft 26 on which the one end 41a of the right connecting rod 41 fits, and the right connecting rod 41, to allow the one end 41a of the right connecting rod 41 to be displaced relative to the second shaft portion 26b in a direction along the axis of the connecting shaft 26. Specifically, as shown in FIG. 4 and FIG. 6, the right connecting 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 41a, and making the right connecting hole 46 a right long hole that is long in the direction along the axis of the right connecting rod 41.

As shown in FIG. 6, a flange 26c is provided between the first shaft portion 26a and the second shaft portion 26b, protruding toward the outside in the diameter direction of the connecting shaft 26. The flange 26c is configured to separate the one end 31a of the left interlocking rod 31 and the one end 41a of the right interlocking rod 41 in the direction along the axis of the connecting shaft 26, even if the one end 31a of the left interlocking rod 31 and the one end 41a of the right interlocking rod 41 are brought together.

As shown in FIG. 6, the first shaft portion 26a, the second shaft portion 26b, and the flange portion 26c are formed by a bushing member 29 that fits around the connecting shaft 26. The bushing member 29 is made of resin. The bushing member 29 is divided into two split bushing members 29a, 29b in a direction along the axis of the connecting shaft 26. The split bushing member 2a, one of the two split bushing members 29a, 29b, is provided with the first shaft portion 26a and a split flange portion of the flange portion 26c that is connected to the first shaft portion 26a. The other split bushing member 2b, one of the two split bushing members 29a, 29b, is provided with the second shaft portion 26b and a split flange portion of the flange portion 26c that is connected to the second shaft portion 26b. In this embodiment, the bushing member 29 is divided into two split bushing members 29a and 29b, but it is also possible to use a non-split bushing member as the bushing member 29.

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

[Interlocking accommodation department]
As shown in Fig. 3, the left interlocking mechanism 30 is provided with a left interlocking interchange part 35. When the right interlocking mechanism 40 transmits the rolling operation force of the sector gear 23 to the right side part 19b, the left interlocking interchange part 35 allows relative movement between the sector gear 23 and the left interlocking mechanism 30, and is configured so that the rolling operation force of the sector gear 23 is not transmitted to the left side part 19a. The right interlocking mechanism 40 is provided with a right interlocking interchange part 45. When the left interlocking mechanism 30 transmits the rolling operation force of the sector gear 23 to the left side part 19a, the right interlocking interchange part 45 allows relative movement between the sector gear 23 and the right interlocking mechanism 40, and is configured so that the rolling operation force of the sector gear 23 is not transmitted to the right side part 19b.

Specifically, as shown in Figures 3 and 4, the left interlocking interchangeable portion 35 has a left connecting hole 36 provided at one end 31a of the left interlocking 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 interlocking rod 31. The left connecting hole 36 is configured to allow the sector gear 23 to slidably engage. The sector gear 23 is slidably engaged with the left connecting hole 36 by slidably inserting the connecting shaft 26 into the left connecting hole 36 (left long hole).

As shown in Figures 3 and 4, the right interlocking interchange section 45 has a right connecting hole 46 provided at one end 41a of the right interlocking 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 interlocking rod 41. The right connecting hole 46 (right long hole) is configured to slidably engage with the sector gear 23. The sector gear 23 slidably engages with the right connecting hole 46 by slidably inserting the connecting shaft 26 into the right connecting hole 46 (left long hole).

When the sector gear 23 is operated in the swinging direction indicated by arrow A (see FIG. 3), the connecting shaft 26 is positioned at the left end of the left connecting hole 36 (left long hole) and the left interlocking rod 31 is pushed to the left of the machine by the connecting shaft 26, and the rolling operation force of the sector gear 23 is transmitted to the left side portion 19a by the left interlocking mechanism 30. At this time, the connecting shaft 26 moves to the left of the machine through the right connecting hole 46 (right long hole) of the right interlocking rod 41, and the rolling operation force of the sector gear 23 is not transmitted to the right interlocking rod 41, and the rolling operation force of the sector gear 23 is not transmitted to the right side portion 19b.

When the sector gear 23 is operated in the swing direction indicated by arrow B (see FIG. 3), the connecting shaft 26 is positioned at the right end of the right connecting hole 46 (right long hole) and the right interlocking rod 41 is pushed to the right of the machine by the connecting shaft 26, and the rolling operation force of the sector gear 23 is transmitted to the right side portion 19b by the right interlocking mechanism 40. At this time, the connecting shaft 26 moves to the right of the machine through the left connecting hole 36 (left long hole) of the left interlocking rod 31, and the rolling operation force of the sector gear 23 is not transmitted to the left interlocking rod 31, and the rolling operation force of the sector gear 23 is not transmitted to the left side portion 19a.

In this embodiment, the left interlocking interchangeable part 35 is provided with a left connecting hole 36 (left long hole) at one end 31a of the left interlocking rod 31 with which the sector gear 23 slidably engages, but the sector gear 23 (rolling operation part) may also be provided with a left long hole with which the one end 31a of the left interlocking rod 31 slidably engages. In this embodiment, the right interlocking interchangeable part 45 is provided with a right connecting hole 46 (right long hole) at one end 41a of the right interlocking rod 41 with which the sector gear 23 slidably engages, but the sector gear 23 (rolling operation part) may also be provided with a right long hole with which the one end 41a of the right interlocking rod 41 slidably engages.

[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 between the sector gear 23 and the operation case 25 .

As shown in Figs. 5, 6 and 7, the operation position detection mechanism 50 includes magnetic generating units 52 provided at two locations on the sector gear 23, and a magnetic sensor 51 provided on the operation case 25. The two magnetic generating units 52 are composed of 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 is opened in the first outer peripheral portion 25a of the operation case 25, which allows the magnetic sensor 51 to detect the magnetic generating units 52.

As shown in Figs. 5 and 6, the sector gear 23 is supported by the first outer periphery 25a of the outer periphery 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 exits from an outlet 55 provided in the side portion 25c, which is the second outer periphery of the operation case 25 and faces in a direction different from the direction in which the first outer periphery 25a faces, and is wired along the side portion 25c.

In the operation position detection mechanism 50, when the sector gear 23 is swung, one of the two magnetic generating units 52 faces the magnetic sensor 51 through the detection port 53, and when the magnetic generating unit 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, and when the other of the two magnetic generating units 52 faces the magnetic sensor 51 through the detection port 53, and when the magnetic generating unit 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 the detection result is transmitted from the magnetic sensor 51 to the control device 21.

In this embodiment, the magnetic generating units 52 are provided at two locations on the sector gear 23, but the magnetic generating units 52 may be provided at three or more locations to detect three or more operating positions of the sector gear 23.

When the sector gear 23 is in the neutral position in the rolling operation mechanism 20, even if an operating force acts on the seedling planting device 10 in a direction that causes it to swing, the left coil spring 32 and the right coil spring 42 resist the force with their elastic restoring force, and the swinging of the seedling planting device 10 is suppressed by the left coil spring 32 and the right coil spring 42.

The rolling motor 24 is controlled by the control device 21, and the sector gear 23 is operated by the rolling motor 24 in the swing direction indicated by the arrow A (left swing direction) or the swing direction indicated by the arrow B (right swing direction). The swing operation of the sector gear 23 in the swing direction indicated by the arrow A (left swing direction) and the swing operation of the sector gear 23 in the swing direction indicated by the arrow B (right swing direction) are performed until the tilt angle sensor 22 detects that the left-right posture of the seedling planting device 10 has become horizontal or close to horizontal. The swing operation of the sector gear 23 in the swing direction indicated by the arrow A (left swing direction) can be performed until the operation position detection mechanism 50 detects that the sector gear 23 has reached the swing operation limit operation position by one of the two magnetic generating units 52 and the magnetic sensor 51. The sector gear 23 can be swung in the direction indicated by arrow B (rightward swing direction) until the other of the two magnetic generators 52 and the magnetic sensor 51 in the operating position detection mechanism 50 detects that the sector gear 23 has reached the operating position at the swing operation limit.

9, when the sector gear 23 is swung in the left swing direction, the rolling force of the sector gear 23 is transmitted to the left side portion 19a by the left interlocking mechanism 30. That is, the left interlocking rod 31 is pushed to the left of the machine body by the connecting shaft 26, the rolling force of the sector gear 23 is transmitted from the left interlocking rod 31 to the left coil spring 32, and from the left coil spring 32 to the left connecting member 33, the left side 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 force to the left connecting member 33 while being slightly compressed and deformed by the rolling force of the sector gear 23, and the sector gear 23 and the left side portion 19a are interlocked with some interlocking flexibility. When the seedling planting device 10 is rolled counterclockwise, the right interlocking interchangeable portion 45 acts to transmit the rolling force of the sector gear 23 to the right interlocking rod 41 and not to the right side portion 19b, and the load of 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, the right side portion 19b of the seedling planting device 10 swings upward in response to the rolling operation, and the right interlocking rod 41 is pushed toward the sector gear 23 by the right side portion 19b via the right connecting member 43 and the right coil spring 42, so that the connecting shaft 26 is positioned at the right end portion of the right connecting hole 46 (right long hole) of the right interlocking rod 41.

When the sector gear 23 is swung in the right swing direction, the rolling force of the sector gear 23 is transmitted to the right side portion 19b by the right interlocking mechanism 40. That is, the right interlocking rod 41 is pushed to the right of the machine body by the connecting shaft 26, the rolling force of the sector gear 23 is transmitted from the right interlocking rod 41 to the right coil spring 42, and from the right coil spring 42 to the right connecting member 43, the right side portion 19b is pushed by the right connecting member 43, and a rolling operation is performed in which the seedling planting device 10 is rolled clockwise with the axis X of the machine body in the forward and backward direction as the rolling fulcrum. The right coil spring 42 transmits the rolling force to the right connecting member 43 while being slightly compressed and deformed by the rolling force of the sector gear 23, and the sector gear 23 and the left side portion 19a are interlocked with some interlocking flexibility. When the seedling planting device 10 is rolled clockwise, the left interlocking interchangeable portion 35 acts to transmit the rolling force of the sector gear 23 to the left interlocking rod 31 and not to the left side portion 19a, and the load of lifting the left side of the seedling planting device 10 is not applied to the sector gear 23. However, when the seedling planting device 10 is rolled clockwise, the left side portion 19a of the seedling planting device 10 swings upward in response to the rolling operation, and the left interlocking rod 31 is pushed toward the sector gear 23 by the left side portion 19a via the left connecting member 33 and the left coil spring 32, so that the connecting shaft 26 is positioned at the left end portion of the left connecting hole 36 (left long hole) of the left interlocking rod 31.

When the sector gear 23 is swung, an operating force acts on the left interlocking rod 31 and the right interlocking rod 41, tilting them from the neutral position of the sector gear 23, due to the forward and backward movement of the connecting shaft 26 supporting one end 31a of the left interlocking rod 31 and one end 41a of the right interlocking rod 41. However, the left connecting part 27 allows the one end 31a of the left interlocking rod 31 to move relative to the first shaft part 26a, and the left connecting part 27 prevents the left interlocking mechanism 30 from assuming an unnatural position. The right connecting part 28 allows the one end 41a of the right interlocking rod 41 to move relative to the second shaft part 26b, and the right connecting part 28 prevents the right interlocking mechanism 40 from assuming an unnatural position. Even if one end 31a of the left interlocking rod 31 and one end 41a of the right interlocking rod 41 move out of place, the one end 31a of the left interlocking rod 31 and the one end 41a of the right interlocking rod 41 are separated by the flange 26c so that the left interlocking rod 31 and the right interlocking rod 41 do not come into contact with each other.

[Restoring force adjustment section]
As shown in FIG. 4, the left interlocking mechanism 30 is provided with a left restoring force adjustment unit 37, and is configured so that the elastic restoring force of the left coil spring 32 when the sector gear 23 is in the neutral state can be adjusted by the left restoring force adjustment unit 37.

Specifically, as shown in FIG. 4, the left restoring force adjustment section 37 is configured so that the left connecting member 33 is detachably connected to the left side portion 19a by a connecting bolt 38, and the left side portion 19a is provided with a number of mounting holes 39 for replacing the connecting bolts 38, aligned in the left-right direction of the aircraft.

In the left restoring force adjustment section 37, the connecting bolt 38 is replaced with a selected mounting hole 39 from among a plurality of mounting holes 39 to change the connecting position of the left connecting member 33 in the left side portion 19a, thereby changing the distance between the spring receiving portion 31c of the left interlocking rod 31 and the spring receiving portion 33b of the left connecting member 33, thereby changing the amount of compressive elastic deformation of the left coil spring 32, and adjusting the restoring force of the left coil spring 32. 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 interlocking rod 31 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 is rotated and adjusted to adjust the length by which the rod portion 31L protrudes from the spring receiving portion 33b to the side opposite to the left coil spring side. In other words, regardless of changes in the distance between spring receiving portion 31c and spring receiving portion 33b, the connecting shaft 26 is adjusted so that it is positioned at the end of the left coil spring side (left side) of the left connecting hole 36 (left long hole) of the left interlocking rod 31 when the sector gear 23 is in the neutral state.

As shown in FIG. 4, the right interlocking mechanism 40 is provided with a right restoring force adjustment unit 47, and is configured so that the elastic restoring force of the right coil spring 42 when the sector gear 23 is in the neutral state can be adjusted by the right restoring force adjustment unit 47.

Specifically, as shown in FIG. 4, the right restoring force adjustment unit 47, like the left restoring force adjustment unit 37, is configured such that the right connecting member 43 is detachably connected to the right side portion 19b by a connecting bolt 48, and the right side portion 19b is provided with a number of mounting holes 49 for replacing the connecting bolts 48, aligned in the left-right direction of the aircraft.

In the right restoring force adjustment section 47, the connecting bolt 48 is replaced with a selected mounting hole 49 from among a plurality of mounting holes 49 to change the connecting position of the right connecting member 43 in the right side portion 19b, thereby changing the distance between the spring receiving portion 41c of the right interlocking rod 41 and the spring receiving portion 43b of the right connecting member 43, thereby changing the amount of compressive elastic deformation of the right coil spring 42, and adjusting the restoring force of the right coil spring 42. 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 interlocking rod 41 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 is rotated and adjusted to adjust 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. In other words, regardless of changes in the distance between spring receiving portion 41c and spring receiving portion 43b, the connecting shaft 26 is adjusted so that it is positioned at the end of the right coil spring side (right side) of the right connecting hole 46 (left long hole) of the right interlocking rod 41 when the sector gear 23 is in the neutral state.

In this embodiment, the left restoring force adjustment unit 37 is configured to adjust the position of the left connecting member 33 in the left lateral side portion 19a, but it is also possible to adopt a configuration that adjusts the position of the spring receiver 33b in the left connecting member 33, or a configuration that adjusts the position of the spring receiver 31c in the left interlocking rod 31. In this embodiment, the right restoring force adjustment unit 47 is configured to adjust the position of the right connecting member 43 in the right lateral side portion 19b, but it is also possible to adopt a configuration that adjusts the position of the spring receiver 43b in the right connecting member 43, or a configuration that adjusts the position of the spring receiver 41c in the right interlocking rod 41.

[Another embodiment]
In the above-described embodiment, an example was shown in which a seedling planting device was used as the ground work device, but the ground work device may also be a device that performs various ground work, such as sowing various seeds such as rice and wheat in a field, or fertilizing work such as spreading fertilizer in a field.

The present invention can be applied to a work machine equipped with a ground work device connected to a traveling body so as to be able to roll around the longitudinal axis of the body, and a rolling operation mechanism for rolling the ground work device.

3 Running body 8a Rear link (part on the running body side)
8c Upper link 8d Lower link 10 Seedling planting device (ground work device)
19a Left side portion 19b Right side portion 20 Rolling operation mechanism 23 Sector gear (rolling operation portion)
24 Rolling motor (rolling actuator)
26 Connecting shaft 25 Operation case (support part)
25a First outer peripheral part 25c Side part (second outer peripheral part)
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 interchangeable portion 36 Left connecting hole (left long hole)
37 Left restoring force adjustment 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 interchangeable portion 46 Right connecting hole (right long hole)
47 Right restoring force adjustment unit 51 Magnetic sensor 52 Magnetic field generation unit 54 Electric wire

Claims (9)

A running body,
A ground work device is connected to the traveling vehicle body so as to be capable of rolling about a vehicle body longitudinal axis;
a rolling operation mechanism for rolling the ground work device,
The rolling operation mechanism is provided with a rolling operation unit supported on a portion of the traveling machine body side so as to be displaceable in the left-right direction of the machine body, a rolling actuator which displaces the rolling operation unit, a left interlocking mechanism which interlocks the rolling operation unit with the left side portion of the ground work device via a left elastic member, and a right interlocking mechanism which interlocks the rolling operation unit with the right side portion of the ground work device via a right elastic member,
the left elastic member has an elastic restoring force in a direction separating the rolling operation unit from a left lateral portion of the ground work apparatus when the rolling operation unit is in a neutral state,
The right elastic member has an elastic restoring force in a direction separating the rolling operation unit from a right side portion of the ground work device when the rolling operation unit is in a neutral state . A left restoring force adjustment unit is provided that can adjust the elastic restoring force of the left elastic member.
2. The work machine according to claim 1, further comprising a right restoring force adjustment section that is capable of adjusting the elastic restoring force of the right elastic member. The left interlocking mechanism includes a left interlocking rod having one end connected to the rolling operation unit, and a left connecting member connected to the left side portion in a state of slidably supporting the other end of the left interlocking rod,
the left elastic member is a left coil spring that is fitted onto the left interlocking rod in a state where it is sandwiched between a spring receiving portion provided at one end of the left interlocking rod and a spring receiving portion provided on the left connecting member,
the left restoring force adjustment portion is configured to change an amount of compressive elastic deformation of the left coil spring by changing a 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 includes a right interlocking rod having one end connected to the rolling operation unit, and a right connecting member connected to the right side portion in a state of slidably supporting the other end of the right interlocking rod,
the right elastic member is a right coil spring that is fitted onto the right interlocking rod in a state where it is sandwiched between a spring receiving portion provided at one end of the right interlocking rod and a spring receiving portion provided on the right connecting member,
3. The work machine according to claim 2, wherein the right restoring force adjustment portion is configured to change the amount of compressive elastic deformation of the right coil spring by changing the distance between the spring bearing portion of the right interlocking rod and the spring bearing portion of the right connecting member. A right interlocking mechanism is provided that allows relative movement between the rolling operation unit and the right interlocking mechanism when the left interlocking mechanism transmits the rolling operation force of the rolling operation unit to the left side portion,
The work machine according to any one of claims 1 to 3, further comprising a left interlocking mechanism that allows relative movement between the rolling operation unit and the left interlocking mechanism when the right interlocking mechanism transmits the rolling operation force of the rolling operation unit to the right side portion. The left interlocking mechanism is provided with a left interlocking rod having one end connected to the rolling operation unit,
The left interlocking portion is provided on one of the one end of the left interlocking rod and the rolling operation portion, and includes a left long hole with which the other of the one end of the left interlocking rod and the rolling operation portion can slidably engage,
The right interlocking mechanism is provided with a right interlocking rod having one end connected to the rolling operation unit,
The work machine according to claim 4, wherein the right interlocking interchangeable portion is provided on one of the one end of the right interlocking rod and the rolling operation portion, and has a right long hole with which the other of the one end of the right interlocking rod and the rolling operation portion slidably engage. The work machine according to any one of claims 1 to 5, which is provided with a plurality of magnetic generating units provided at a plurality of locations on the rolling operation unit, and a magnetic sensor that detects the operating position of the rolling operation unit by detecting each of the plurality of magnetic generating units. a link mechanism is provided which has an upper link and a lower link extending from the traveling machine body so as to be able to swing up and down, and a rear link which is connected to a free end of the upper link and a free end of the lower link and which supports the ground work device so as to be able to roll, and which connects the ground work device to the traveling machine body so as to be able to rise and fall,
7. The work machine according to claim 6, wherein an operating case housing the magnetic sensor is supported by the rear link. The rolling operation unit is supported on a first outer circumferential portion of the outer circumferential portion of the operation case,
The work machine according to claim 7, wherein an electric wire extending from the magnetic sensor is wired along a second outer periphery portion of the outer periphery of the operating case, the second outer periphery portion facing in a direction different from the direction in which the first outer periphery portion faces. The work machine according to claim 7 or 8, wherein the operating case is supported by the rear link in a state in which it is positioned above and along the upper link when the ground work device is in the lowest operating position.

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