JP2004229560A - Device for detecting height of reaping section above ground for harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting the height of a reaping section above the ground utilizing a ground contact sensor 21 in a scarcely breakable manner even if slipped sideways on the ground. <P>SOLUTION: The device has the following construction and mechanism: The ground contact sensor 21 is swingably supported axially X on a supporting body 25 mounted on a dividing frame 16. The supporting body 25 is linked to the dividing frame 16 so as to turn about the axis Y in the longitudinal direction of the machine body and impelled turnably by a coil spring 60 at a reference turning position where the ground contact sensor 21 is to make a vertical swinging motion about the axis X relative to the dividing frame 16. A detective unit 22 interlocks with the rotating support shaft 41 of the sensor 21 through an interlocking mechanism in a gear case 40 and functions to detect the height of the reaping section above the ground based on the swing angle of the sensor 21. The engagement part 65 of the dividing frame 16 is engaged on the engagement part 21d on the rear end of the sensor 21 so as to restrain the rear end of the sensor from slipping sideways relative to the dividing frame 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting unit of a harvester, comprising: a ground contact sensor that can swing up and down with respect to a weeding frame; and a detection unit that detects a height of the cutting unit with respect to the ground based on the swing angle of the contact sensor. The present invention relates to a ground height detection device.
[0002]
[Prior art]
In the harvester, a detecting device for detecting the ground height of the mowing part is provided, and when the height detected by the ground height detecting device becomes equal to or less than the set height, the mowing part is automatically raised with respect to the traveling body. The mowing unit is automatically moved up and down with respect to the traveling body so that the ground height of the mowing unit is set within a set range based on a result of detection by the ground height detecting device. The control is executed so that the mowing part of the mowing part can be prevented from plunging into the ground even when the traveling machine leans back and forth, or the mowing height of the mowing device is maintained at the set height. You may be able to work while you work.
[0003]
A grounding sensor that can swing up and down with respect to the weeding frame, and a detecting unit that detects the ground height of the cutting unit based on the swing angle of the grounding sensor, and the ground height of the cutting unit is detected by the grounding sensor. Conventionally, there has been an apparatus disclosed in Patent Document 1, for example, as a device for detecting a cutting portion-to-ground height of a harvester that is to be detected.
That is, a sled-shaped ground contact member as a ground sensor is attached to a weed support rod as a weed frame so as to be able to swing up and down around the horizontal axis, and detects that the ground contact member has swung downward by a certain amount or more. And a switch for detecting that the ground contact member has swung upward by a certain amount or more.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 60-5778 (Page 2, Figure 2-3)
[0005]
[Problems to be solved by the invention]
When the steering operation of the airframe is performed, the mowing unit swings laterally with respect to the ground, and the ground contact sensor may slide on the ground. When the conventional sensor is used, when the ground sensor slides on the ground, the ground sensor is caught on a bulge or soil mass on the ground, and a strong bending force is likely to be applied to the ground sensor or the sensor support. Had become. Excessive force was also likely to be applied to the detection unit.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a harvesting unit-to-ground height detecting device of a harvester in which an excessive force is hardly applied to a grounding sensor even if the grounding sensor slides on the ground.
[0007]
[Means for Solving the Problems]
The configuration and operation of the invention according to claim 1 are as follows.
[0008]
〔Constitution〕
A ground contact sensor that can swing up and down with respect to the weeding frame, and a cutting unit-to-ground height detection of a harvester that includes a detecting unit that detects the ground height of the cutting unit based on the swing angle of the ground sensor. In the device,
A supporting body rotatably connected to the weeding frame around a longitudinal axis of the fuselage; and urging means for urging the supporting body to a reference rotation position with respect to the weeding frame. So that the ground sensor is rotated with respect to the weeding frame around the axis with the support, and swings up and down with respect to the support at the reference rotation position. Supported by the support, the detection unit is supported by the support so as to rotate with respect to the weeding frame around the axis with the support, and connected to the support of the ground sensor. A locking portion is provided on the rear end side opposite to the side where the ground sensor is located, and the locking portion is engaged with the locking portion to allow the grounding sensor to rotate around the axis with respect to the weeding frame. Lateral displacement with respect to the weeding frame on the rear end side An engaging portion for regulating are provided on the divided grass frame.
[0009]
[Action]
When the ground contact sensor is moved laterally on the ground and is subjected to movement resistance by being caught on a ridge, etc., depending on the magnitude of the resistance, the ground sensor rolls together with the support against the urging means. At this time, since the engaging portion is engaged with the locking portion on the rear end side of the grounding sensor to allow rotation of the grounding sensor and restricts lateral displacement with respect to the weeding frame on the rear end side of the grounding sensor, The ground contact sensor rolls in a state in which the rear end side does not greatly displace from the weeding frame due to movement resistance. Further, at this time, the detection unit also rolls together with the ground sensor. Thereafter, when the rotation operation force is not applied due to the ground sensor being disengaged or the like, the support returns to the reference rotation position due to the rotation urging by the urging means, and the ground sensor also rotates together with the support. It moves to return to the detection posture. As a result, even if the ground sensor is caught on a ridge or the like, both the ground sensor and the detection unit roll, and the rear end of the ground sensor is supported by the engaging portion so as not to be largely displaced from the weeding frame. In addition, an unreasonable operating force such as a bending force stronger than the strength determined by the urging force of the urging means is not applied to the grounding sensor or the sensor supporting portion or the detecting portion.
[0010]
〔effect〕
Therefore, even if the ground sensor slides on the ground, it is difficult to apply excessive bending force to the ground sensor, the support part and the detecting part of the ground sensor, and it is difficult to deform or break. It becomes something.
[0011]
The structure and operation of the invention according to claim 2 are as follows.
[0012]
〔Constitution〕
In the configuration according to the first aspect of the present invention, the lateral width of the locking portion of the grounding sensor is smaller than the lateral width of the grounding action portion.
[0013]
[Action]
The engaging portion engages with the locking portion so as to restrict the lateral displacement of the grounding sensor while allowing the rotation of the grounding sensor by a lateral width difference between the engaging portion and the locking portion, The larger the width of the locking portion, the larger the engaging portion. The wider the width of the grounding action portion of the grounding sensor, the more difficult it is for the grounding sensor to sink even in wetlands. As a result, the above-mentioned engagement between the engaging portion and the locking portion can be performed while widening the width of the grounding action portion of the grounding sensor and reducing the size of the engaging portion for the width. It is to be.
[0014]
〔effect〕
Therefore, although it is difficult to settle the ground contact sensor even in wetlands, it is possible to advantageously prevent lateral displacement of the rear end side of the ground contact sensor with a small engaging portion.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, a crawler-type traveling unit 1 is self-propelled, and is a boarding-type driving unit equipped with a driving seat 2, and a driving unit provided with an engine (not shown) located below the driving seat 2. The base end side of the pre-processing unit frame 11 of the mowing unit 10 is rotatably connected to a support unit 4 located at a front part of a body frame 3 of a self-propelled body having a horizontal rotation around a body horizontal axis. A threshing device 5 and a grain tank 6 are provided on the rear end side of the body frame 3 to constitute a combine.
[0016]
This combine harvests grains such as rice and wheat. When a hydraulic lift cylinder 8 having a cylinder rod connected to the pre-processing unit frame 11 via a link mechanism 7 is operated, this combine is lifted. The cylinder 8 swings the pre-processing unit frame 11 up and down to move the reaping unit 10 up and down to a working position in which the reaping unit 10 is lowered to near the ground and a non-working position in which the mowing unit 10 rises high from the ground. When the mowing unit 10 is set to the lowering work position and the self-propelled machine is caused to travel, the mowing unit 10 weeds a plurality of planting stems to be mowed by a plurality of planting streaks by a plurality of weeding tools 12 arranged in the lateral direction of the machine. To a corresponding one of the plurality of raising devices 13 arranged in the lateral direction of the body, and is raised and raised by raising raising claws (not shown) of each raising device 13, and is clipped by a clipper type cutting device 14. The harvesting and cutting grain culm is transported to the rear side of the machine body by a transporting device 17 including a pinching transporting device acting on the base of the stock and a locking transporting device acting on the tip side, and the threshing device 5 cuts the grain from the transporting device 17. While conveying the culm by the threshing feed chain 5a in the rearward direction of the machine body, the tip side is supplied to a handling room (not shown) for threshing, and the grain tank 6 collects and stores threshing grains from the threshing device 5. To go.
[0017]
More specifically, the mowing unit 10 is configured as shown in FIGS.
That is, a main frame 11a, which is a transmission case facing in the front and rear direction of the fuselage, the base end of which is rotatably connected to the support portion 4 of the body frame 3, and an intermediate portion is connected to the distal end of the main frame 11a. The pre-processing unit frame 11 is constituted by a transmission case 15 or the like in which the body is oriented sideways. The weeding frame 16 is extended forwardly from a plurality of portions of the support member 15a of the laterally transmitting case 15 in the lateral direction of the fuselage, and the culm is raised by a pair of neighboring weeding frames 16. 18, the weeding tool 12 is fixed to the tip of each weeding frame 16, and the raising device 13 is arranged on the side of each grain stem raising path 18. The mowing device 14 is mounted over the base end of the mowing device.
[0018]
As shown in FIG. 2, the mowing part 10 of the mowing part 10 is located slightly behind the weeding implement 12 located at the outermost lateral side of the fuselage 12 of the mowing part 10 using the grounding sensor 21. A reaper-to-ground height detecting device 20 for detecting the ground height is provided. As shown in FIG. 9, the control means 30 linked with the detecting section 22 of the cutting section-to-ground height detecting device 20 is connected to the electromagnetic operating section of the control valve 31 of the lift cylinder 8 and the cutting height provided in the operating section. The setting means 32 is linked.
[0019]
The cutting height setting means 32 is constituted by a potentiometer which can be manually operated, and variably sets the cutting height of the cutting device 14 to be maintained by cutting height control, and converts the set cutting height to an electric signal to control means. 30.
[0020]
The control means 30 is constituted by using a microcomputer, and automatically controls the lift cylinder 8 based on information detected by the cutting section-to-ground height detecting device 20 and setting information by the cutting height setting means 32. Height control is performed.
In other words, when the height detected by the cutting section-to-ground height detecting device 20 deviates from the cutting height set by the cutting height setting means 32, the control valve 31 outputs a signal for operating the lift cylinder 8, thereby causing the lift cylinder 8 to operate. Is operated on the ascending side or the descending side of the mowing unit 10, so that the mowing unit 10 is raised or lowered, and the mowing unit-to-ground height detecting device 20 corresponds to the setting height set by the cutting height setting means 32. When the ground height is detected, a signal to stop the lift cylinder 8 is output to the control valve 31 to stop the lift cylinder 8 to stop the raising and lowering of the mowing unit 10. I have.
[0021]
Thereby, when the harvesting height control by the control means 30 is switched on in performing the harvesting work, the height detected by the cutting unit-to-ground height detecting device 20 becomes equal to the setting height set by the cutting height setting means 32. The cutting height is controlled by automatically raising and lowering the cutting unit 10 so that the ground height of the cutting device 14 is set even if the self-propelled body is tilted in the front-rear direction due to unevenness or inclination of the running ground. The stump is maintained at or near the height, and the stump can be operated in a state where the height of the stump is at or near the set cutting height.
[0022]
The raising / lowering lever 34 shown in FIG. 9 is provided in the driving unit so as to be manually operated, and when operated, outputs a command for raising or lowering the reaping unit 10 to the control unit 30 to raise or lower the reaping unit 10. It is something to be operated. That is, the mowing unit 10 is manually moved up and down. The control means 30 switches the control valve 31 to prioritize the detection result by the cutting section-to-ground height detection device 20 and operates the lift slider 8 when the lifting lever 34 is operated to input a rising or lowering command. It is designed to be operated on the ascending side and the descending side of 10.
[0023]
As shown in FIG. 2 and FIG. 3, the cutting unit-to-ground height detecting device 20 is located at the most laterally outer side of the fuselage on the side opposite to the side where the driving unit is located among the plurality of weeding tools 12. A support 25 attached near the rear end of the weeding frame 16 for supporting the weeding tool 12 near the rear side of the weeding tool 12 to be connected, and the base side of the lower side of the support 25 is connected to an alligator. The grounding sensor 21 and the detecting unit 22 attached to the side surface of the upper part of the support 25 are allotted.
[0024]
As shown in FIGS. 3 and 4 and the like, the support 25 includes a mounting member 50 made of sheet metal having pin-shaped mounting portions 51 and 52 on the front and rear sides, and the mounting portions 51 and 52 of the mounting member 50. 52 and a gear case 40 having one side connected by a screw. The bent round bar is connected to the distal end of a round steel tube forming the proximal end portion 16a of the weeding frame 16. Thus, the both attachment portions 51 and 52 are connected to the bent portion 16b provided at the tip of the weeding frame 16. That is, the front-side mounting portion 51 is rotatably mounted in a mounting hole of a front support portion 16c provided by mounting a tubular body below the vertical portion of the body on the distal end side of the bending portion 16b. The rear mounting portion 52 is rotatably mounted in a mounting hole of a rear support portion 16d provided by mounting a bracket at a lower portion of the body vertical portion on the end side, so that the rear mounting portion 52 is connected to the bending portion 16b. Accordingly, the support 25 rotates with respect to the weeding frame 16 around an axis Y in the longitudinal direction of the machine body, which is located on the axis of both the mounting portions 51 and 52, and is mounted on the weeding frame 16. The bent portion 16b is designed to bypass the support 25 to the upper side of the fuselage.
[0025]
As shown in FIG. 10 and the like, the grounding sensor 21 is provided with a mounting piece 21c on the front end side, a front end portion 21b on an intermediate portion, and a grounding action portion 21a protruding downward from the rear end side of the fuselage. It is composed of a bent leaf spring. As shown in FIG. 3 and the like, the grounding sensor 21 is supported by the support 25 by connecting the mounting piece 21c to the input shaft 41 of the gear case 40 of the support 25 so as to be integrally rotatable. Accordingly, the grounding sensor 21 swings with respect to the support 25 around an axis X which is the axis of the input shaft 41 and is orthogonal to the rotation axis Y of the support 25. 5 (b) and the reverse rotation direction B shown in FIG. 5 (c) with respect to the weeding frame 25 around the axis Y together with the support 25. It is designed to rotate.
[0026]
As shown in FIGS. 3 and 5, a spring stopper portion 16e disposed between the two end portions 61 and 62 of the coil spring 60 having the coil portion externally fitted to the front mounting portion 51 is provided with weeding. A spring operation pin 53 provided on the bent portion 16b of the frame 16 and disposed between the two spring end portions 61 and 62 at a position closer to the coil portion of the winding spring 60 than the spring stopper portion 16e. The support 25 is fixed to the mounting member 50, and the support 25 is urged to rotate by the winding spring 60 as follows. That is, among the rotation positions of the support 25 around the rotation axis Y with respect to the weeding frame 16, the swing axis X of the ground sensor 21 with respect to the support 25 is oriented sideways, and the ground sensor 21 is positioned with the weed. The rotation position at which the frame 16 swings up and down around the axis X is defined as a reference rotation position N (FIG. 5A), and the support 25 moves from the reference rotation position N in the normal rotation direction A. Regardless of the rotation direction of the rotation direction B or the reverse rotation direction B, the rotation is urged to return to the reference rotation position N automatically when the rotation operation force is released.
[0027]
That is, as shown in FIG. 5B, when the support 25 is rotated from the reference rotation position N in the forward rotation direction A, one of the first spring ends 61 of the coil spring 60 is moved to the spring stopper 16e. While being abutted and supported, the other second spring end 62 is pressed in the forward rotation direction A by the spring operating pin 53 to elastically deform the coil spring 60, and the coil spring 60 moves the support 25 to the reference rotation position N. Is urged to return to. As shown in FIG. 5C, when the support 25 is rotated from the reference rotation position N in the reverse rotation direction B, the second spring end 62 of the coil spring 60 comes into contact with the spring stopper 16e and is supported. Then, the first spring end portion 61 is pressed in the reverse rotation direction B by the spring operation pin 53 to elastically deform the coil spring 60, and the coil spring 60 returns the support 25 to the reference rotation position N and rotates. Energize to.
[0028]
As shown in FIG. 7, the detection unit 22 is configured by a rotary potentiometer whose main body is fixed to a side surface of the gear case 40 and an input shaft 22 a enters the inside of the gear case 40.
[0029]
As shown in FIGS. 6 and 7, a sector gear 42 in which a mounting portion 42 a is fitted externally to the input shaft 41 of the gear case 40, and the input shaft 22 a is meshed with the sector gear 42. A gear interlocking mechanism 44 including a circular gear 43 fitted outside is provided inside the gear case 40. The mounting portion 42a of the sector gear 42 is integrally rotatably engaged with the input shaft 41 due to the non-circular cross section of the input shaft 41. The circular gear 43 is integrally rotatably engaged with the input shaft 22a because of the non-circular cross section of the input shaft 22a. The pitch circle diameter of the sector gear 42 is larger than the pitch circle diameter of the circular gear 43. Thus, the gear interlocking mechanism 44 controls the input shaft 41 so that the rotation of the rotation support shaft 41 that supports the ground sensor 21 so as to be able to swing up and down is transmitted to the input shaft 22 a of the detection unit 22. It is linked to the input shaft 22a of the detection unit 22.
[0030]
Inside the gear case 40, there is provided a sensor spring 46 composed of a wound spring whose coil part is fitted around the input shaft 41. The sensor spring 46 swings the input shaft 41 via the sector gear 42 to swing the ground sensor 21 downward so that the ground action portion 21a of the ground sensor 21 reliably performs the ground action. I'm going.
[0031]
As a result, the mowing unit-to-ground height detecting device 20 operates as follows.
That is, at normal times, the support 25 is at the reference rotation position N due to the winding spring 60, and the ground contact sensor 21 swings up and down with respect to the weeding frame 16 around the axis X. When the ground height of the cutting unit 10 changes and the ground height of the weeding frame 16 changes, the ground contact sensor 21 detects the ground reaction force acting on the ground action unit 21 a and the elasticity of the ground sensor 21. Due to the restoring force and the descending force of the sensor spring 45, the ascending or descending swinging movement of the weeding frame 16 around the axis X is performed. Then, the rotation of the grounding sensor 21 is accelerated by the gear interlocking mechanism 44 and transmitted to the input shaft 22a of the detection unit 22 to operate the detection unit 22. Thus, the detection unit 22 detects the ground height of the reaping unit 10 based on the swing angle of the grounding sensor 21 with respect to the support 25, and detects the ground height of the reaper 14 based on the detection result. The detection result is output to the control means 30 as an electric signal.
[0032]
When the mowing unit 10 is swayed due to the steering operation of the self-propelled body, the ground contact sensor 21 is displaced on the ground. At this time, if the ground sensor 21 is caught on the earth mass, the ground sensor 21 acts on the ground sensor 21. Due to the movement resistance, the ground sensor 21 rolls together with the support 25 around the axis Y against the winding spring 60 and also the detection unit 22 rolls together, and the ground sensor 21 and the input shaft 41 and the detection unit 22 An operating force such as an excessive bending force that is stronger than the strength determined by the urging force of the winding spring 60 is less likely to be applied.
[0033]
As shown in FIG. 2 and the like, a bent round bar material bent and formed in a U-shape is attached to the base end portion 16a of the weeding frame 16, and an engaging portion 65 for the ground contact sensor 21 is provided. As shown in FIG. 8A, the engaging portion 65 is provided at the rear end of the grounding sensor 21 with a width W1 smaller than the width W2 of the grounding action portion 21a (FIG. 4). The engaging portion 65 is engaged with the pair of left and right vertical sides 65a of the machine body even if the rear end of the ground sensor 21 is to be displaced laterally with respect to the weeding frame 16. It engages with the portion 21d and regulates the lateral displacement so that the rear end side of the sensor does not move more than the stroke in which the rear end of the sensor moves due to the interval between the vertical side portions 65a being larger than the horizontal width W1 of the locking portion 21d. It is configured as follows. In addition, the engaging portion 65 is configured such that the locking portion 21d can rotate with respect to the engaging portion 65 due to the interval between the vertical side portions 65a being larger than the horizontal width W1 of the locking portion 21d. The ground sensor 21 is allowed to rotate around the axis Y with respect to the weeding frame 16.
[0034]
That is, the engaging portion 65 determines that when the rotation operation force acts on the ground sensor 21, the ground sensor 21 rolls around the axis Y due to the difference between the width W1 of the locking portion 21 d and the interval between the vertical sides. While allowing, the rear end side of the ground contact sensor 21 is prevented from being greatly displaced with respect to the weeding frame 16 and the torsion of the ground contact sensor 21 is generated. In other words, it is possible to prevent the ground sensor 21 and the input shaft 41 from being subjected to an excessive bending force or the like due to the occurrence of torsion in the ground sensor 21.
[0035]
As shown in FIGS. 7 and 10, an inclined portion 21 e is provided at the front end of the ground contact sensor 21 and is inclined with respect to the longitudinal direction of the aircraft. Due to the action of the inclined portion 21e, the lap between the gear case 40 and the ground contact sensor 21 in a plan view is reduced, the mud is less likely to be clogged between the gear case 40 and the ground contact sensor 21, and the ground contact sensor 21 breaks into the stock. At this time, it becomes difficult to push down the planted grain stem forward.
[0036]
[Another embodiment]
The lift cylinder 8 is mounted on the mowing unit 10 based on the detection result of the mowing unit-ground height detecting device 20 so that the ground height of the mowing device 14 is within the set range regardless of the longitudinal inclination of the self-propelled body as in the above-described embodiment. The lift cylinder 8 is automatically operated on the ascending side or the descending side of the lift cylinder 8 on the basis of the detection result of the mowing portion-to-ground height detecting device 20 so as to prevent the weeding implement 12 from sticking into the ground. The present invention can also be applied to a case in which is automatically operated on the ascending side of the mowing unit 10.
[0037]
The reaping unit-to-ground height detecting device 20 is disposed behind the weeding implement 12 located at the most lateral side of the body opposite to the driving unit as in the above-described embodiment, and is also located at the most lateral end of the driving unit side. It may be arranged behind the weeding implement 12 or behind the weeding implement 12 located on the inside of the fuselage rather than the weeding implements 12 located at both lateral ends thereof.
[0038]
Various types of spring means such as a leaf spring and rubber may be adopted in place of the above-mentioned coil spring 60, and these coil springs 60, leaf springs and rubber may be collectively referred to as urging means 60.
[0039]
The present invention can also be applied to work vehicles for harvesting various crops such as onions and carrots in addition to combine harvesters, and these work vehicles and combines are collectively referred to as harvesters.
[Brief description of the drawings]
FIG. 1 is a side view of a front portion of a combiner. FIG. 2 is a perspective view showing a main frame of a cutting unit and a ground height detecting device. FIG. 3 is a side view of a cutting unit and ground height detecting device. FIG. 5A is an explanatory view showing a reference rotation position of a support, and FIGS. 5B and 5C are explanatory views showing the urging action of a winding spring. FIG. 7 is a front view of a gear case. FIG. 8A is a front view of an engaging portion, and FIG. 8B is a cross-sectional view of a grounding action portion of a grounding sensor. Block diagram [Figure 10] Plan view of ground sensor [Explanation of reference numerals]
Reference Signs List 10 Cutting part 16 Grass weeding frame 21 Grounding sensor 21a Grounding action part 21d of grounding sensor Locking part 22 of grounding sensor Detecting part 25 Supporting body 60 Energizing means 65 Engaging part N Reference rotation position Y of supporting body Rotation axis W1 Width of locking part W2 Width of grounding part

Claims (2)

A grounding sensor that can swing up and down with respect to the weeding frame, and a detecting unit that detects a ground height of the cutting unit based on a swing angle of the grounding sensor. A device,
A supporting body rotatably connected to the weeding frame around a longitudinal axis of the machine body, and an urging means for urging the supporting body to a reference rotation position with respect to the weeding frame. Prepare
The grounding sensor is supported so as to rotate with respect to the weeding frame around the axis together with the support, and to swing up and down with respect to the support at the reference rotation position. Let your body support you,
The detection unit is supported by the support so as to rotate with respect to the weeding frame around the axis together with the support,
A locking portion is provided on the rear end side of the grounding sensor opposite to the side connected to the support, and the locking portion is engaged with the locking portion so that the grounding sensor can be moved around the axis. A harvesting part-to-ground height detecting device for a harvester, wherein an engaging part for restricting a lateral displacement with respect to a weeding frame at a rear end side of a ground sensor while allowing rotation with respect to the grass frame is provided on the weeding frame. 2. The harvesting unit-to-ground height detecting device of a harvester according to claim 1, wherein the lateral width of the locking portion of the grounding sensor is smaller than the lateral width of the grounding action portion.

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