Harvester

Abstract

To provide a harvester that can provide good operability for an operation to avoid contact with and thrust into the ground of a reaping part in such a case of entering a farm field in a configuration to perform automatic control for the height of the reaping part.SOLUTION: A harvester equipped with a reaping part provided so as to be lifted and lowered for a travelling machine body includes: a control unit for controlling the height of the reaping part on the basis of a predetermined target value; a target value setting operation unit for setting a target value within a predetermined setting range; a main speed change lever 17 for performing a predetermined operation for the harvester; and a target value changeover switch 270 provided at the main speed change lever 17 for switching a first target value, which is the target value set by the target value setting operation unit, to a second target value corresponding to the height of the reaping part, which is equal to or higher than the first target value.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to a harvester equipped with a height-adjustable cutting unit.

Background Art

[0002] A combine, which is a type of harvester, is equipped with a cutting unit on the front side of a traveling body and a threshing unit on the traveling body, and performs operations such as cutting of cereal straw by the cutting unit and threshing by the threshing unit while traveling. Conventionally, some combines are configured to be able to raise and lower the cutting unit relative to the traveling body, and perform control of the ground clearance, which is the height of the cutting unit with respect to the ground, and control of the machine clearance, which is the height of the cutting unit with respect to the traveling body (see, for example, Patent Document 1).

[0003] Patent Document 1 describes a cutting height position control means for automatically controlling the raising and lowering of the cutting unit so that the machine clearance becomes a set height, and a cutting height automatic control means for automatically controlling the raising and lowering of the cutting unit so that the ground clearance becomes a set height, and switching both raising and lowering controls in response to a predetermined switching operation signal. Further, in the configuration described in the same document, the target height for each raising and lowering control is set by a cutting height setting dial provided on a cutting height operation panel.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the configuration that automatically sets the height of the cutting unit (cutting height) to the target height as disclosed in Patent Document 1, there are the following problems. For example, when the machine body enters the field for harvesting work, when entering the field by going down a downward slope at the entrance of the field, there are cases where the cutting unit may come into contact with the ground or plunge into the ground when entering the field. In such a case, when the automatic control of the cutting height is ON, if the target height is relatively low, the cutting unit may come into contact with the ground or plunge into the ground when entering the field.

[0006] Therefore, in order to avoid contact or plunging of the cutting unit with the ground when entering the field, the target height can be made relatively high by operating an operation unit for setting the cutting height for setting the target height, such as a cutting height setting dial. However, operating the operation unit for setting the cutting height each time when entering the field is troublesome as an operation while running the machine body.

[0007] The present invention has been made in view of the above problems, and in a configuration for automatically controlling the height of the cutting unit, an object is to provide a harvesting machine capable of obtaining good operability for an operation for avoiding contact or plunging of the cutting unit with the ground when entering the field or the like.

Means for Solving the Problems

[0008] The harvesting machine according to the present invention is a harvesting machine including a cutting unit provided so as to be able to move up and down with respect to a traveling machine body, a control unit that controls the height of the cutting unit based on a predetermined target value, a target value setting operation unit for setting the target value within a predetermined setting range, an operation member for performing a predetermined operation on the harvesting machine, and a target value switching operation unit provided on the operation member for switching a first target value, which is the target value set by the target value setting operation unit, to a second target value corresponding to the height of the cutting unit that is equal to or higher than the first target value.

[0009] In the harvesting machine according to another aspect of the present invention, the second target value is the maximum value within the setting range.

[0010] In a harvester according to another aspect of the present invention, in the harvester, the operation member is a main shift lever for performing a traveling operation of the traveling machine body.

[0011] In a harvester according to another aspect of the present invention, in the harvester, the target value switching operation unit is an operation unit that receives a pressing operation, and the control unit holds a state in which the target value is switched from the first target value to the second target value during the pressing operation of the target value switching operation unit.

[0012] In a harvester according to another aspect of the present invention, in the harvester, the control unit performs control to return the target value from the second target value to the first target value when the pressing operation of the target value switching operation unit is released.

[0013] In a harvester according to another aspect of the present invention, in the harvester, an automatic setting operation unit for automatically positioning the cutting unit at a predetermined working position set in advance is provided, and the target value switching operation unit shares an operating tool with the automatic setting operation unit.

[0014] In a harvester according to another aspect of the present invention, in the harvester, a notification unit for notifying that the target value has been switched from the first target value to the second target value is provided.

Advantages of the Invention

[0015] According to the present invention, in a configuration for automatically controlling the height of the cutting unit, good operability can be obtained for operations to avoid contact or digging of the cutting unit with the ground when entering the field or the like.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Mode for Carrying Out the Invention

[0017] The present invention is provided with a cutting unit whose height can be adjusted, and in a configuration for controlling the cutting height which is the height of the cutting unit, by providing an operation unit for temporarily switching the target value for controlling the cutting height, it aims to obtain good operability for operations to avoid contact or digging of the cutting unit with the ground when entering the field or the like. Hereinafter, taking a combine as an example of a harvesting machine, embodiments of the present invention will be described.

[0018] [Overall Configuration of Combine] Using FIGS. 1 and 2, the overall configuration of the combine 1 according to this embodiment will be described. In the following description, the left side and the right side toward the front (the left side in FIG. 1) of the combine 1 are the left side and the right side in the combine 1, respectively.

[0019] As shown in FIGS. 1 and 2, the combine 1 according to this embodiment includes a traveling unit 2 configured as a crawler - type traveling device having a pair of left - and - right crawler units 3, 3, and a traveling machine body 4 supported by the traveling unit 2. The traveling machine body 4 includes a frame - shaped structural part of the vehicle body of the combine 1. The combine 1 is provided with an engine 11 as a drive source mounted on the traveling machine body 4.

[0020] At the front part of the traveling machine body 4, a cutting unit 5 is provided for taking in while cutting the cereal straws such as rice and wheat in the field. On the traveling machine body 4, a threshing unit 6 for threshing the cereal straws cut by the cutting unit 5 and a grain tank 7 for storing the grains taken out from the threshing unit 6 are provided side - by - side horizontally. The threshing unit 6 is arranged on the left side of the machine body, and the grain tank 7 is arranged on the right side of the machine body. The combine 1 performs operations such as cutting cereal straws by the cutting unit 5 and threshing by the threshing unit 6 while traveling by the traveling unit 2.

[0021] Each crawler unit 3 constituting the traveling unit 2 has a track frame 3a extending in the front - rear direction below the traveling machine body 4, various rotating bodies such as a drive sprocket 3b supported by the track frame 3a, and a crawler 3c wound around these rotating bodies. The crawler unit 3 receives the transmission of the power of the engine 11 at the drive sprocket 3b and is driven.

[0022] The cutting unit 5 is driven by the driving force from the engine 11, cuts the cereal straws, and conveys the cut cereal straws to the threshing unit 6 or the like. The cutting unit 5 is provided at the front side of the traveling body 4 over substantially the entire width of the combine 1. The cutting unit 5 is provided so as to be liftable with respect to the traveling body 4. Note that FIG. 2 shows a state in which the cutting unit 5 is lowered with respect to the state shown in FIG. 1.

[0023] The threshing unit 6 has a handling cylinder 6a having the front-rear direction as the rotation axis direction, and a cereal straw supply device provided to the left of the handling cylinder 6a. The cereal straw supply device sandwiches the stock of the cereal straws cut by the cutting unit 5 and conveys the cereal straws rearward in a lying posture with the spike tip on the side of the handling cylinder 6a. The cereal straw supply device includes a feed chain (not shown) wound around a plurality of sprockets having the left-right direction as the rotation axis direction, and a cereal straw supply clamping body 6c that cooperates with this to clamp the stock of the cereal straws.

[0024] Below the threshing unit 6 on the traveling body 4, a sorting unit 8 for sorting the processed material threshed by the threshing unit 6 is provided. The sorting unit 8 has a swing sorting device 8a, a wind sorting device, and a grain conveying device. The sorting unit 8 swing-sorts the processed material that has fallen from the threshing unit 6 by the swing sorting device 8a, and wind-sorts the processed material after the swing sorting by the wind sorting device. Among the processed material after the wind sorting, the sorting unit 8 conveys the grains rightward toward the grain tank 7 by the grain conveying device, and blows the straw scraps and dust rearward by the wind sorting device and discharges them to the outside of the machine body. The grains conveyed toward the grain tank 7 by the grain conveying device are stored in the grain tank 7.

[0025] On the right rear end portion of the traveling body 4, a discharge auger 9 as a grain discharge device for discharging the grains in the grain tank 7 to the outside is provided so as to be rotatable. The discharge auger 9 has a discharge port 9a at the tip, and discharges the grains stored in the grain tank 7 from the discharge port 9a. The grains discharged from the discharge port 9a are put into the loading platform of a truck, a container, or the like.

[0026] On the traveling body 4, behind the threshing unit 6, a straw processing unit 10 for processing the straw discharged after the threshing process by the threshing unit 6 is provided. The straw processing unit 10 includes a straw conveying device 10a and a straw cutting device 10b. The straw conveying device 10a conveys the threshed grain straws (straws) backward by the threshing unit 6 to discharge them outside the machine body or convey them to the straw cutting device 10b. The straw cutting device 10b cuts the straws conveyed from the straw conveying device 10a and discharges them outside the machine body.

[0027] On the traveling body 4, in front of the grain tank 7, an operation unit 14 covered by the cab 13 is provided. At the front of the operation unit 14, a handle unit 15 as a steering operation unit is provided. Behind the handle unit 15, a driver's seat 16 is provided. On the left side of the driver's seat 16, a side operation unit 12 is provided in which various operation tools including the main transmission lever 17 and various operation unit groups 300 such as dials and switches are arranged with respect to the side column 19 (see Fig. 11). The main transmission lever 17 is an operation member for performing traveling operations of the traveling body 4 such as forward and backward movement and speed increase and decrease of the machine body.

[0028] Below the operation unit 14, a prime mover unit including the engine 11 is provided. The engine 11 is, for example, a diesel engine. The power of the engine 11 is transmitted to various devices provided in each part of the combine 1 via a transmission device or the like.

[0029] The cutting unit 5 will be described with reference to Figs. 1 to 3. The cutting unit 5 has a cutting support frame 20 as a cutting frame, and a weeding plate 21, a lifting device 22, a scraping device 23, a cutting blade device 24, a grain straw conveying device 25, etc. are supported on the cutting support frame 20 to be configured. Each device included in the cutting unit 5 operates by the power being transmitted from the engine 11.

[0030] The weeding plate 21 is an example of a weeding body constituting the weeding unit 50 included in the cutting unit 5, and is provided at the front of the cutting unit 5. The weeding plate 21 has a tapered shape and weeds the grain straws growing in the field.

[0031] The lifting device 22 is provided on the rear side of the straw dividing plate 21, and includes a lifting case 22b extending in the front-rear direction in plan view, and tines 22a which are a plurality of lifting claws connected by a chain provided in the case 22b. The lifting device 22 is provided such that the lifting case 22b is inclined upward to the rear in side view, and by operating the plurality of tines 22a, the lodged cereal straws are lifted up.

[0032] The raking-in device 23 is provided on the rear side of the lifting device 22, and is configured to include a conveying mechanism 23a driven by a chain, a rotary packer 23b, etc., and rakes in the cereal straws. In FIG. 3, only the components provided at the left end of the raking-in device 23 are shown, and the illustration of other components is omitted.

[0033] The cutting blade device 24 is a clipper-type device that cuts the base of the lifted cereal straws. The cereal straw conveying device 25 is a device that conveys the cut cereal straws, merges a plurality of cut cereal straws, clamps and conveys them upward to the rear, and delivers them in a lying-down posture to the starting end of the feed chain of the threshing unit 6.

[0034] As shown in FIG. 1, the cutting support frame 20 is supported by a support frame 26 arranged in a downward-forward state on the front side of the traveling body 4. The support frame 26 is provided at approximately the center in the left-right direction of the body, and the cutting support frame 20 is provided on the front side of the support frame 26.

[0035] As shown in FIG. 3, the cutting support frame 20 includes a horizontal frame 31 extending in the left-right direction of the body, and a plurality of straw dividing frames 32, 34 extending forward from the horizontal frame 31. The cutting support frame 20 is supported by the support frame 26 at the horizontal frame 31.

[0036] The horizontal frame 31 is a linear frame portion made of a square pipe-shaped member. The weed dividing frames 32 and 34 are frame portions made of round pipe-shaped members, have a predetermined bent shape or curved shape, and extend in the front-rear direction in plan view. The weed dividing frames 32 and 34 are supported in a cantilevered manner by fixing and supporting their rear ends or rear parts to the horizontal frame 31.

[0037] The plurality of weed dividing frames 32 and 34 are arranged in parallel at a predetermined interval in the left-right direction. The number of weed dividing frames 32 and 34 provided is one more than the number of cutting rows of the combine 1. The combine 1 according to the present embodiment is a six-row cutter, and seven weed dividing frames 32 and 34 are provided. Among the seven weed dividing frames 32 and 34, the weed dividing frames 34 located second and sixth from the left respectively have shapes different from those of the other plurality of (five) weed dividing frames 32.

[0038] The lifting device 22 is arranged between the adjacent weed dividing frames 32 and 34 on the left and right, and a total of six lifting devices 22 are provided. The lower part of the case 22b of the lifting device 22 is connected and supported to the front parts of the respective weed dividing frames 32 and 34 via a support stay (not shown) or the like. In addition, a weed dividing plate 21 is attached to the front part of each weed dividing frame 32 and 34. As the plurality of weed dividing plates 21, two types of weed dividing plates 21, a relatively large one and a relatively small one, are provided in a predetermined arrangement. In the present embodiment, four relatively large weed dividing plates 21 and three relatively small weed dividing plates 21 are alternately arranged in the left-right direction.

[0039] The mowing unit 5 configured as described above is mounted on the traveling body 4 so as to be rotatable about a predetermined rotation axis via a mowing elevation cylinder 18 (see FIG. 1) as an elevating device. That is, the mowing unit 5 is provided so as to be able to move up and down relative to the traveling body 4 by a rotation operation caused by the telescopic operation of the mowing elevation cylinder 18. The mowing elevation cylinder 18 is a hydraulic cylinder and is provided between the traveling body 4 and the support frame 26. The rear end portion of the support frame 26 is supported by the traveling body 4 so as to be rotatable about a horizontal axis as a rotation fulcrum for the elevating operation of the mowing unit 5 by the mowing elevation cylinder 18.

[0040] As described above, the combine 1 is provided with the mowing unit 5 so as to be able to move up and down relative to the traveling body 4. And the combine 1 includes a mowing height detection device 40 and a control device 200 (see FIG. 10) in order to control the mowing height (height relative to the ground), which is the height of the mowing unit 5 from the ground 30. In such a configuration, based on the detection signal of the mowing height detection device 40, the control device 200 controls the operation of the mowing elevation cylinder 18 that raises and lowers the mowing unit 5, and automatic control of the mowing height is performed.

[0041] The operation of the mowing elevation cylinder 18 is controlled by controlling the operation of an electromagnetic valve, which is a control valve. The control device 200 controls the mowing height by controlling the operation of the control valve of the mowing elevation cylinder 18 based on the detection signal of the mowing height detection device 40.

[0042] The automatic control of the mowing height controls the operation of the control valve of the mowing elevation cylinder 18 based on the detection signal of the mowing height detection device 40 so as to maintain the mowing height at a set value, and automatically controls the elevation of the mowing unit 5. In the automatic control of the mowing height, the control device 200 controls the height of the mowing unit 5 so that the mowing height detected by the mowing height detection device 40 becomes a preset target value (hereinafter referred to as "mowing height target value").

[0043] That is, when the detected cutting height is lower than the target cutting height, the control device 200 raises the cutting unit 5, and when the detected cutting height is higher than the target cutting height, the control device 200 lowers the cutting unit 5, thereby performing lifting control of the cutting unit 5 so that the cutting height is maintained at a height corresponding to the target cutting height.

[0044] Also, in the automatic control of the cutting height, the target cutting height may be set as a value within a predetermined range (a value with a width). In this case, when the detected cutting height is lower than the lower limit value of the target cutting height, the control device 200 raises the cutting unit 5, and when the detected cutting height is higher than the upper limit value of the target cutting height, the control device 200 lowers the cutting unit 5, thereby performing lifting control of the cutting unit 5 so that the cutting height is maintained within a range of heights corresponding to the target cutting height.

[0045] The operation unit 14 is provided with an operation unit for adjusting the cutting height. For example, during the automatic control of the cutting height, control is performed to prioritize the adjustment of the cutting height by operating the operation unit for adjusting the cutting height. As an example of the operation unit for adjusting the cutting height, a cutting lift lever 35 (see FIG. 10) for lifting and lowering the cutting unit 5 and a cutting unit lift switch 252 (see FIG. 12) are provided.

[0046] By manually operating the cutting lift lever 35, the operation of the control valve of the cutting lift cylinder 18 is controlled via the control device 200, and the cutting unit 5 is lifted and lowered. By operating the cutting lift lever 35 from the neutral position to the upward side, the cutting lift cylinder 18 is controlled to extend, and the cutting unit 5 rises. By operating the cutting lift lever 35 from the neutral position to the downward side, the cutting lift cylinder 18 is controlled to contract, and the cutting unit 5 descends. Note that the operation unit for adjusting the cutting height may be configured by an operating tool other than a lever, such as a switch operation unit (cutting unit lift switch).

[0047] In addition, the operation unit 14 is provided with a cutting auto-lift switch 36 for raising the cutting unit 5 to a predetermined height position set for the cutting unit 5 as an operation unit for operating the cutting unit 5, and a cutting auto-set switch 37 for lowering the cutting unit 5 to the predetermined height position set for the cutting unit 5 (FIG. 10). After the engine 11 is started, when the cutting clutch is ON and the cutting auto-lift switch 36 is turned ON, the cutting unit 5 automatically rises until it reaches the predetermined height position set in advance along with the extension drive of the cutting lift cylinder 18. Further, after the engine 11 is started, when the cutting clutch is ON and the cutting auto-set switch 37 is turned ON, the cutting unit 5 automatically descends until it reaches the predetermined height position set in advance along with the contraction drive of the cutting lift cylinder 18.

[0048] The cutting auto-lift switch 36 and the cutting auto-set switch 37 are arranged as operation buttons on the main transmission lever 17 (see FIG. 12). During the raising and lowering of the cutting unit 5 by operating these switches, the raising and lowering operation of the cutting unit 5 by operating the cutting lift lever 35 or the like is prioritized. The cutting auto-set switch 37 is an example of an automatic setting operation unit for automatically positioning the cutting unit 5 at a predetermined working position set in advance. The cutting clutch is turned ON by operating a clutch operating tool such as a work clutch lever arranged in the operation unit 14.

[0049] In this embodiment, the cutting height detection device 40 is arranged behind the dividing plates 21A located second from the left and sixth from the left among the seven dividing plates 21 (see FIG. 3). The dividing plate 21A is supported by a dividing frame 34 having a different shape from other dividing frames 32. The dividing plate 21A is a relatively small dividing plate among the two types of dividing plates 21. In this way, the combine 1 is provided with two cutting height detection devices 40. However, the number of cutting height detection devices 40 provided in the combine 1 and the positions where the cutting height detection devices 40 are provided are not limited. The cutting height detection device 40 may be provided, for example, at one location behind the dividing plate 21 at the left end or the right end.

[0050] [Configuration of cutting height detection device] The configuration of the cutting height detection device 40 will be described with reference to FIGS. 4 to 9. As shown in FIGS. 4 to 9, the cutting height detection device 40 includes a device main body 41, a grounding body 42, a cutting height sensor 43 which is a sensor for detecting the cutting height, and a unit support body 44 which is a member for supporting the device main body 41.

[0051] In the cutting height detection device 40, an integral sensor unit 45 is formed by the device main body 41, the grounding body 42, and the cutting height sensor 43 (see FIG. 9), and this sensor unit 45 is supported so as to be rotatable about an axis in the left-right direction with respect to the unit support body 44. The unit support body 44 is supported so as to be rotatable about an axis in the front-rear direction with respect to the grass dividing unit 50.

[0052] As a whole, the cutting height detection device 40 is supported so as to be rotatable about an axis in the front-rear direction with respect to the grass dividing unit 50, and the sensor unit 45 is supported so as to be rotatable about an axis in the left-right direction with respect to the unit support body 44. The rotation of the cutting height detection device 40 about the front-rear direction axis and the rotation of the sensor unit 45 about the left-right direction axis are performed according to the external force acting on the cutting height detection device 40. Hereinafter, a state in which no external force is acting on the cutting height detection device 40 is defined as the reference state, and basically, the cutting height detection device 40 in the reference state will be described.

[0053] In the sensor unit 45, the device main body 41 has a configuration in which various gears, springs, etc. are supported on a predetermined axis in a case 51 made of, for example, a metal casting. The case 51 has a left-right two-part structure including a right case body 52 forming the main body of the case 51 and a left case body 53 covering the left side of the right case body 52 in a lid shape. The right case body 52 and the left case body 53 are fixed to each other by fixing bolts 55 at four locations around the case 51 in a side view. The case 51 has a substantially rectangular outer shape with the longitudinal direction being the front-rear direction (the left-right direction in FIG. 6) in a side view.

[0054] In the sensor unit 45, the grounding body 42 extends downward from the rear side of the rear end of the case 51. Further, the cutting height sensor 43 is provided in a manner attached to the right side surface portion of the case 51.

[0055] The unit support 44 is a member in a form bent so that a narrow plate-like member forms a predetermined shape in plan view and extends in the front-rear direction. As shown in FIG. 8, the unit support 44 has a first support 46 mainly constituting the left side portion of the unit support 44 and a second support 47 mainly constituting the right side portion of the unit support 44.

[0056] The unit support 44 has a left side surface portion 44a elongated in the front-rear direction, a front surface portion 44b formed to be perpendicular from the front end portion of the left side surface portion 44a toward the right, and a right side surface portion 44c formed from the right end portion of the front surface portion 44b toward the rear and elongated in the front-rear direction. These surface portions forming the unit support 44 are all vertical surface portions. That is, both the first support 46 and the second support 47 are plate-like members in a form bent so as to form a predetermined shape in plan view, and the left side surface portion 44a, the front surface portion 44b, and the right side surface portion 44c are formed by these supports.

[0057] As shown in FIG. 8, the first support 46 has an outer wall surface portion 46a forming the left side surface portion 44a of the unit support 44, a front wall surface portion 46b forming a part of the front surface portion 44b of the unit support 44, and an inner wall surface portion 46c formed to be perpendicular from the right end portion of the front wall surface portion 46b toward the rear. The first support 46 forms a substantially "J" - shaped bent shape in plan view by the outer wall surface portion 46a, the front wall surface portion 46b, and the inner wall surface portion 46c. Also, as shown in FIG. 8, the second support 47 has a side wall surface portion 47a forming the right side surface portion 44c of the unit support 44, a front wall surface portion 47b forming a part of the front surface portion 44b of the unit support 44, and a beveled wall surface portion 47c formed at the corner formed by the side wall surface portion 47a and the front wall surface portion 47b and having a chamfered shape in bottom view.

[0058] The left side surface portion 44a of the unit support 44 (the outer wall surface portion 46a of the first support 46) is an elongated plate-like portion with the left-right direction as the plate thickness direction and extending in the front-rear direction. The left side surface portion 44a extends the position of the rear end portion rearward beyond the rear end portion of the case 51 in the front-rear direction. The front surface portion 44b of the unit support 44 is a plate-like portion with the front-rear direction as the plate thickness direction. The front surface portion 44b is formed by the front side wall surface portion 46b of the first support 46 and the front side wall surface portion 47b of the second support 47.

[0059] The first support 46 and the second support 47 are connected to each other by being fastened and fixed by a screw body 48 and a nut 49 that penetrate the overlapping portion between the front side wall surface portions 46b and 47b. The screw body 48 projects the screw portion forward from the front side wall surface portion 47b of the second support 47, and the nut 49 is screwed onto this projecting portion. The fixing portions by the screw body 48 are provided at two locations, upper and lower.

[0060] The right side surface portion 44c of the unit support 44 (the side wall surface portion 47a of the second support 47) is an elongated plate-like portion with the left-right direction as the plate thickness direction and extending in the front-rear direction, and is provided so as to face the left side surface portion 44a in the left-right direction. The right side surface portion 44c positions the rear end portion at substantially the same position as the rear end portion of the case 51 in the front-rear direction.

[0061] The unit support 44 has a shape that is open at the top and bottom and, in plan view, follows a substantially rectangular shape with the front-rear direction as the longitudinal direction by the left side surface portion 44a, the front surface portion 44b, and the right side surface portion 44c. The unit support 44 positions the left side surface portion 44a, the front surface portion 44b, and the right side surface portion 44c on the left side, the front, and the right side of the sensor unit 45 (see FIG. 9), respectively, and constitutes a peripheral wall portion surrounding the periphery of the sensor unit 45. That is, the sensor unit 45 is provided so as to be positioned, in plan view, entirely or substantially entirely in the space portion surrounded by the unit support 44.

[0062] Each part of the sensor unit 45 will be described. The apparatus main body 41 is provided so as to be vertically rotatable about a front fixed shaft 61 which is the first axis. The front fixed shaft 61 is a support shaft having the left - right direction as its axial direction, and supports the sensor unit 45 so as to be rotatable about the first axis center P1 (see FIGS. 6 and 8).

[0063] The front fixed shaft 61 is located in the apparatus main body 41 near the front end portion of the case 51. The front fixed shaft 61 has its right end fixed to the inner wall surface portion 46c of the first support 46 via a support plate 56, and extends leftward from the inner wall surface portion 46c. The front fixed shaft 61 is a fixed shaft supported in a cantilever manner with respect to the inner wall surface portion 46c. The support plate 56 is fixed at two locations, above and below, by bolts 57 in a state of overlapping the inner side (left side) of the inner wall surface portion 46c. Note that the front fixed shaft 61 may be a shaft fixed to the unit support 44. The front fixed shaft 61 is supported so as to be relatively rotatable with respect to the case 51. That is, the case 51 is supported so as to be rotatable with respect to the front fixed shaft 61.

[0064] In this way, the sensor unit 45 is provided so as to be vertically rotatable in a cantilever - supported state with the left - right direction as the axial direction with respect to the front fixed shaft 61 which is a fixed shaft fixed to the unit support 44 (see FIG. 6, arrow A1). That is, the unit support 44 supports the apparatus main body 41 of the sensor unit 45 so as to be vertically rotatable about the first axis center P1 by the front fixed shaft 61.

[0065] Regarding the rotation of the sensor unit 45 around the first axis P1 with respect to the unit support 44, the sensor unit 45 is biased in the downward rotation direction (clockwise direction when viewed from the left side) by a case return member, which is an elastic member such as a spring provided in the case 51. The case return member is, for example, a torsion spring with both ends of a coiled main body portion being linear extension portions. In this case, the case return member is provided in a state where the front fixing shaft 61 penetrates through the main body portion, one extension portion is locked to the front fixing shaft 61 side, and the other extension portion is locked to the case 51 side, and a force for pushing down the case 51 with respect to the front fixing shaft 61 side acts thereon. Thereby, the sensor unit 45 is biased in the direction of rotating downward around the axis of the front fixing shaft 61.

[0066] Also, a case return spring 58 for biasing the sensor unit 45 in the downward rotation direction with respect to the front fixing shaft 61 is provided at a portion of the front fixing shaft 61 protruding rightward from the case 51 (see FIG. 8). The case return spring 58 is a torsion spring with both ends of a coiled main body portion being linear extension portions 58a.

[0067] The case return spring 58 is provided in a state where the front fixing shaft 61 penetrates through the main body portion, one extension portion 58a is inserted into and locked to a locking hole portion 52a (see FIG. 7) formed on the right side of the front portion of the right case body 52 of the case 51, and the other extension portion 58a is locked to the front surface portion 44b of the unit support 44 in a predetermined manner, and a force for pushing down the case 51 with respect to the front fixing shaft 61 side acts thereon. Thereby, the sensor unit 45 is biased in the direction of rotating downward around the axis of the front fixing shaft 61.

[0068] On the other hand, regarding the rotation of the sensor unit 45 with respect to the unit support 44, the downward rotation of the sensor unit 45 is restricted at the reference state position by a case stopper bolt 59 provided on the case 51. The case stopper bolt 59 is screwed in from the left into the front-rear intermediate portion of the upper edge of the left case body 53, and the head protrudes leftward from the left case body 53.

[0069] With such a configuration, in the reference state, the sensor unit 45 makes the head of the case stopper bolt 59 abut against the upper edge of the left side surface 44a of the unit support 44, thereby preventing relative downward rotation with respect to the unit support 44. Note that the locking portion of the sensor unit 45 with respect to the unit support 44 may be a protruding portion formed as a part of the left case body 53.

[0070] In this way, with respect to rotation around the front fixing shaft 61, the sensor unit 45 is urged in the downward rotation direction and the downward rotation with respect to the unit support 44 from the reference state is restricted. Therefore, when an external force from the ground 30 or the like acts on the sensor unit 45 so as to rotate the sensor unit 45 upward around the front fixing shaft 61, the sensor unit 45 rotates upward against the biasing force of the case return member and the case return spring 58 in the case 51. When the acting of the external force is released, the sensor unit 45 in the upwardly rotated state automatically rotates downward by the biasing force of the case return spring 58 or the like and returns to the position in the reference state by the locking action of the case stopper bolt 59 with respect to the unit support 44.

[0071] The grounding body 42 is rotatably supported by a rear rotation shaft 62 which is a second shaft located behind the front fixing shaft 61 with respect to the apparatus main body 41. The rear rotation shaft 62 is a support shaft having the left - right direction as the axial direction, and rotatably supports the grounding body 42 with respect to the case 51 of the apparatus main body 41 around the second axis center P2.

[0072] The rear rotation shaft 62 is located near the rear end portion of the case 51 and is relatively rotatably supported with respect to the case 51 via a bearing member such as a bush. The grounding body 42 is fixedly provided on the portion of the rear rotation shaft 62 protruding rightward from the case 51. The grounding body 42 has a grounding body main body portion 42a which is a portion extending downward from the apparatus main body 41 and a support arm portion 42b which is a support portion with respect to the rear rotation shaft 62. Both the grounding body main body portion 42a and the support arm portion 42b are plate - shaped portions having a predetermined shape.

[0073] The grounding body main body portion 42a is a spatula-shaped portion having a downwardly widening shape with a gradually increasing width (dimension in the left-right direction) from the upper side to the lower side. The support arm portion 42b extends right-forward along the case 51 from the upper end portion of the grounding body main body portion 42a located immediately behind the case 51 and is fixed to the rear rotation shaft 62. The support arm portion 42b penetrates the right end portion of the rear rotation shaft 62 at its front portion and is fastened and fixed to the rear rotation shaft 62 by a nut 68 or the like. A screw portion for receiving the screwing of the nut 68 is formed at the right end portion of the rear rotation shaft 62.

[0074] In this way, the grounding body 42 is fixed to the rear rotation shaft 62 and rotates integrally with the rear rotation shaft 62 about the second axis P2. The grounding body 42 is provided so as not to interfere with the case 51 within its rotation range. Regarding the rotation position of the grounding body 42, the position of the grounding body 42 in the mowing height detection device 40 in the reference state is taken as the reference position.

[0075] The grounding body 42 performs the following rotation as a relative rotation about the rear rotation shaft 62 with respect to the apparatus main body 41. That is, with the tip in contact with the ground 30, the grounding body 42 rotates (rearward rotation) so as to move the tip side rearward due to the pulling resistance (ground sliding resistance) from the ground 30 as the combine 1 moves forward (see arrow C1 in FIG. 6). On the other hand, the grounding body 42 rotates (forward rotation) so as to move the tip side forward due to the ground sliding resistance as the combine 1 moves backward (see arrow C2 in FIG. 6).

[0076] The mowing height sensor 43 is a sensor that detects the amount of rotation of the grounding body 42 about the rear rotation shaft 62. The mowing height sensor 43 is provided with respect to the intermediate rotation shaft 70 which is the third axis provided in the mowing height detection device 40, and detects the amount of rotation of the grounding body 42 about the rear rotation shaft 62 from the amount of rotation of the intermediate rotation shaft 70.

[0077] The intermediate rotation shaft 70 is a support shaft with its axial direction being the left - right direction. It is supported so as to be relatively rotatable with respect to the case 51 of the apparatus main body 41 via a bearing member such as a bush around the third axis center P3. The intermediate rotation shaft 70 is located in the middle of the front - side fixed shaft 61 and the rear - side rotation shaft 62 in the front - rear direction.

[0078] The cutting - height sensor 43 is a rotary potentiometer. It detects the rotational position of the grounding body 42 via the intermediate rotation shaft 70 and the rear - side rotation shaft 62. The cutting - height sensor 43 is fixed to the right - case body 52 at two positions, upper and lower, by bolts 73 with respect to the right - side surface portion of the right - case body 52 (see Fig. 7).

[0079] The cutting - height sensor 43 receives the connection at the right - end portion of the intermediate rotation shaft 70. Taking the intermediate rotation shaft 70 as the detection axis, it directly detects the rotational position around the third axis center P3 of the intermediate rotation shaft 70. The cutting - height sensor 43 has a main body portion 43a and a connector portion 43b to which a signal line is connected in the main body portion 43a. One end side of a wire harness (not shown) as a signal line is connected to the connector portion 43b. The cutting - height sensor 43 is connected to the control device 200 provided on the traveling machine body 4 side by the wire harness. Note that the cutting - height sensor 43 may have a configuration in which a signal line extends directly from the main body portion as a connection configuration to the control device 200.

[0080] The intermediate rotation shaft 70 rotates by receiving the transmission of the rotational power of the rear - side rotation shaft 62 accompanying the rotation of the grounding body 42. The intermediate rotation shaft 70 receives the transmission of the rotational power of the rear - side rotation shaft 62 via gears or the like provided on the respective shafts of the rear - side rotation shaft 62 and the intermediate rotation shaft 70. The rotation of the intermediate rotation shaft 70 is detected by the cutting - height sensor 43. The grounding body 42 uses an elastic member such as a spring provided in the case 51 as a grounding - body return member. It is provided so as to be positioned at a predetermined reference position in a state where it is not affected by an external force with respect to the rotation around the rear - side rotation shaft 62 by setting the biasing force (torque) of the grounding - body return member, the case return member, etc.

[0081] In the mowing height detection device 40 having the above-described configuration, when the grounding body 42 is located behind the reference position, it is provided so as to rotate around the rear rotation shaft 62 with respect to the device main body 41 in a state where the rotation around the front fixed shaft 61 is stopped. That is, for example, when the body of the combine 1 moves forward, when the grounding body 42 receives a pressing action from the front and rotates to the rear side of the reference position, the device main body 41 does not rotate around the front fixed shaft 61, and only the grounding body 42 rotates relative to the device main body 41 around the rear rotation shaft 62.

[0082] And the mowing height sensor 43 detects the amount of rotation of the grounding body 42 backward from the reference position. That is, the relative backward rotation of the grounding body 42 with respect to the device main body 41 from the state where the grounding body 42 is at the reference position is detected by the mowing height sensor 43 as the rotation for detecting the mowing height.

[0083] On the other hand, regarding the relative rotation of the grounding body 42 with respect to the device main body 41, the rotation of the grounding body 42 forward from the reference position will be accompanied by the upward rotation of the case 51. That is, in the rotation of the grounding body 42 forward from the reference position, the device main body 41 will rotate upward as a whole around the front fixed shaft 61 in conjunction with the rotation of the grounding body 42. Here, in the relative rotation of the grounding body 42 forward from the reference position with respect to the device main body 41, the intermediate rotation shaft 70 does not rotate, and the rotation of the intermediate rotation shaft 70 is not detected by the mowing height sensor 43.

[0084] As described above, the mowing height detection device 40 is configured such that the mowing height sensor 43 detects the amount of rotation of the grounding body 42 in the state of the grounding body 42 rotating backward from the reference position with respect to the device main body 41.

[0085] With the mowing height detection device 40 having the above-described configuration, the combine 1 detects the height (mowing height) of the cutting unit 5 based on the detection signal from the mowing height sensor 43. As described above, since the mowing height detection device 40 detects the backward rotation of the grounding body 42, the mowing height is mainly detected when the body of the combine 1 moves forward.

[0086] In the mowing height detection device 40, the mowing height sensor 43 detects the rotational position of the intermediate rotating shaft 70 that rotates in conjunction with the rotation of the grounding body 42, thereby detecting the height of the dividing grass plate 21 from the ground 30, that is, the mowing height. The detection signal of the mowing height sensor 43 is sent to the control device 200 via a wire harness. The control device 200 receives the input of the detection signal from the mowing height sensor 43, and based on the detection signal, operates the mowing lift cylinder 18 (see FIG. 1) so as to hold the mowing height calculated from the detection result as a set value, and adjusts the mowing height.

[0087] In the configuration where the mowing height sensor 43 is attached to the outside of the case 51 of the device main body 41, the device main body 41 is provided with a sensor cover 170 that covers the mowing height sensor 43. The sensor cover 170 is fixed to the case 51 by bolts 176.

[0088] [Support configuration of mowing height detection device] The support configuration of the mowing height detection device 40 will be described with reference to FIGS. 4 to 8. The mowing height detection device 40 is rotatably supported so as to swing left and right about an axis line O1 (see FIGS. 6 and 8) along the front-rear direction by the support configuration of the unit support 44 with respect to the dividing grass part 50.

[0089] As shown in FIGS. 4 to 8, the dividing grass part 50 includes a dividing grass frame 34 provided at the lower part of the mowing part 5 and a dividing grass plate 21 provided at the front side of the dividing grass frame 34. Here, the dividing grass plate 21 and the dividing grass frame 34 related to the support of the mowing height detection device 40 are the dividing grass plate 21A and the dividing grass frame 34 located at the second and sixth positions from the left, respectively (see FIG. 3).

[0090] The weed separating frame 34 has, from the rear end side to the front end side, a rear inclined portion 101 which is a downwardly inclined portion, an intermediate horizontal portion 102 which is a horizontal portion, and a front inclined portion 103 which is an upwardly inclined portion forming an obtuse angle together with the intermediate horizontal portion 102. The intermediate horizontal portion 102 and the front inclined portion 103 form a curved corner portion 104. The weed separating frame 34 has the rear end portion of the rear inclined portion 101 as the base end portion and the front end portion of the front inclined portion 103 as the tip end portion. The weed separating frame 34 positions the rear end portion of the rear inclined portion 101 above the lateral frame 31, and fixes the rear inclined portion 101 to the lateral frame 31 via a predetermined support member 105 fixed to the lateral frame 31 (see FIG. 4).

[0091] The weed separating plate 21 has a weed separating plate main body 121 and a rib plate portion 122 provided on the rear side of the weed separating plate main body 121. The weed separating plate main body 121 is a plate-shaped member with the front side being the convex side in a plan sectional view, and has a sharp shape that gradually narrows from the rear side to the front side in a front view and a plan view. The weed separating plate main body 121 has a curved shape that slopes downward to the front and has the rear lower side as the convex side in a side view. The rib plate portion 122 is a plate-shaped portion with the left-right direction as the plate thickness direction, and is provided as an integral part with the weed separating plate main body 121 on the rear side of the front plate portion of the weed separating plate main body 121. The configuration in which the rib plate portion 122 is provided on the weed separating plate main body 121 has a substantially symmetrical shape.

[0092] Further, the weed separating portion 50 includes a hitch 125 as a weed separating plate support member provided on the rear side of the weed separating plate 21. The hitch 125 is a longitudinally extending plate-shaped member, and is provided in an upwardly inclined state such that its longitudinal direction follows the upward slope of the weed separating plate 21. The hitch 125 is fixed to the weed separating frame 34 via a hitch support plate 124. The hitch support plate 124 is a plate-shaped member with the left-right direction as the plate thickness direction, and is fixedly provided to the front inclined portion 103 of the weed separating frame 34 by welding or the like.

[0093] The hitch 125 is fastened and fixed to the hitch support plate 124 by bolts 127 and nuts 128 at two locations in the front and rear in a state where the rear part is overlapped with the hitch support plate 124 from the left side. A weed separating plate 21 is attached to the hitch 125. The weed separating plate 21 is fastened and fixed to the hitch 125 by bolts 141 and nuts 142 at two locations in the front and rear in a state where the rear part of the rib plate portion 122 is overlapped with the front part of the hitch 125 from the right side. In this way, the hitch 125 supports the weed separating plate 21 in front of the weed separating frame 34 by being fixed to the weed separating frame 34.

[0094] With respect to the weed separating portion 50 having the above-described configuration, the mowing height detection device 40 is supported so as to be rotatable about an axis in the front-rear direction. The mowing height detection device 40 has a shaft support portion 130 on its front side as a support portion for the weed separating portion 50, and is supported by this shaft support portion 130 so as to be rotatable about an axial center line O1 in the front-rear direction as a rotation axis.

[0095] The shaft support portion 130 is provided on the rear side of the weed separating plate 21. The shaft support portion 130 has a boss portion 132 which is a support portion provided on the rear side of the weed separating plate 21, and a support shaft portion 131 which is provided at the front end portion of the unit support body 44 and is supported by the boss portion 132. The shaft support portion 130 has a configuration in which the support shaft portion 131 protruding forward from the front side wall surface portion 46b of the front surface portion 44b of the unit support body 44 is supported by the boss portion 132 provided at the lower end portion of the hitch 125. That is, the front end portion side of the mowing height detection device 40 is attached to the hitch 125 via the boss portion 132.

[0096] The support shaft portion 131 protrudes forward from the front side wall surface portion 46b as a part integrated with the unit support body 44, and the axis thereof coincides with the axial center line O1. The boss portion 132 is a hollow cylindrical portion having an open rear side, and is provided by fixing a cylindrical member to the lower end portion of the hitch 125. The support shaft portion 131 is rotatably supported by the boss portion 132 via a bearing member such as a bush in a state where the front portion is inserted into the boss portion 132, and is prevented from coming off from the boss portion 132 by a set screw 137 and a lock nut 138 (see FIG. 8).

[0097] In this way, the shaft support portion 130 supports the support shaft portion 131 provided at the front portion of the unit support 44 via the hitch 125 and by means of the boss portion 132 with respect to the weed separating plate 21. Thereby, the shaft support portion 130 supports the front side of the cutting height detection device 40 with respect to the weed separating portion 50 so as to be rotatable about the longitudinal direction as the rotation axis. The cutting height detection device 40 is cantilever-supported with respect to the weed separating portion 50 by the shaft support portion 130.

[0098] As described above, the cutting height detection device 40 supports the unit support 44 with respect to the weed separating portion 50 so as to be rotatable about the axial center line O1 in the longitudinal direction, thereby supporting the sensor unit 45 supported by the unit support 44 so as to be swingable left and right.

[0099] The cutting height detection device 40 is elastically positioned by a return spring 147 provided in the shaft support portion 130 so as to be located at a predetermined neutral position with respect to rotation about the axis in the longitudinal direction. The return spring 147 is a so-called torsion spring, penetrates the rear portion of the boss portion 132 through the coiled portion, and is locked to a locking pin 148 projecting forward from the front side wall surface portion 46b above the boss portion 132.

[0100] The return spring 147 positions the extending portions 147a at both ends on both the left and right sides of the locking pin 148, and clamps the locking pin 148 with elastic force from both the left and right sides by the extending portions 147a. Further, the return spring 147 positions the extending portions 147a on both the left and right sides of the lower portion of the hitch 125 located above the locking pin 148, and clamps the hitch 125 with elastic force by the left and right extending portions 147a.

[0101] According to such a configuration, when an external force of a predetermined magnitude or more that rotates the cutting height detection device 40 around the axis line O1 acts on the cutting height detection device 40, the cutting height detection device 40 presses one extension portion 147a with the locking pin 148 according to the rotation direction and locks the other extension portion 147a to the hitch 125, and rotates against the elastic force of the return spring 147. Then, when the action of the external force disappears, the cutting height detection device 40 returns to the neutral position by the elastic force of the return spring 147.

[0102] [Operation of the cutting height detection device] The operation of the cutting height detection device 40 will be described. During normal operation by the combine 1, that is, during operation in the state where the machine body is moving forward, height control of the cutting height is performed based on the detected value of the cutting height by the cutting height detection device 40 so that the cutting height is maintained at the set value. Detection of the cutting height is performed in a state where the grounding body 42 is positioned behind the reference position with respect to the rotational position with respect to the device main body 41.

[0103] During forward movement of the machine body, the grounding body 42 that slides in a state where the tip is in contact with the ground 30 rotates rearward around the rear-side rotation shaft 62 from the reference position with respect to the case 51 of the device main body 41 due to the ground sliding resistance (see FIG. 6, arrow C1). The grounding body 42 rotates around the second axis P2 integrally with the rear-side rotation shaft 62, the rotation of the rear-side rotation shaft 62 is transmitted to the intermediate rotation shaft 70 via a gear or the like, the rotation of this intermediate rotation shaft 70 is detected by the cutting height sensor 43, and the cutting height is detected based on the amount of rotation of the intermediate rotation shaft 70.

[0104] Also, for example, when a lateral external force acts on the cutting height detection device 40 when a steering operation of the machine body is performed in a state where the grounding body 42 is grounded, the cutting height detection device 40 rotates around the axial center line O1 in the front-rear direction by the shaft support portion 130 and escapes. When the action of the lateral external force on the cutting height detection device 40 disappears, the cutting height detection device 40 returns to a predetermined neutral position by the biasing structure of the return spring 147 and the locking pin 148.

[0105] [Control configuration of the combine] The control configuration of the combine 1 will be described with reference to FIG. 10. As shown in FIG. 10, the combine 1 includes a control device 200. The control device 200 controls each part of the combine 1 based on input signals from various sensors and the like provided in the combine 1. The control device 200 includes a CPU (Central Processing Unit) as an arithmetic processing device that executes various arithmetic processes and controls, a storage device such as a RAM (Random Access Memory) and a ROM (Read Only Memory), an input / output device (input / output circuit) such as an input / output interface for data input / output, and a peripheral circuit such as a clock circuit, which are connected by a bus or the like. The CPU of the control device 200 performs arithmetic processing according to various programs stored in the ROM and the like.

[0106] As shown in FIG. 10, the combine 1 is configured to be electrically connected to the input device (input circuit) of the control device 200. In addition to the cutting height sensor 43 of the cutting height detection device 40, it has a cutting height adjustment dial 202 as a target value setting operation unit for the cutting height, an automatic cutting height switch 205, and a relative machine body height sensor 203 as a relative machine body height detection device. The control device 200 receives the input of signals from these sensors, switches, etc., and generates a control signal based on these signals.

[0107] The relative machine body height sensor 203 is provided on a shaft support portion that rotatably supports the cutting unit 5 around a predetermined rotation axis along the left-right direction with respect to the traveling machine body 4. The relative machine body height sensor 203 is a relative machine body position sensor for detecting the relative machine body height (relative to the own machine height), which is the height of the cutting unit 5 with respect to the traveling machine body 4. The relative machine body height sensor 203 is, for example, a rotary potentiometer, and detects the rotation position of the cutting unit 5 via the rotation axis of the cutting unit 5 with respect to the traveling machine body 4.

[0108] The combine harvester 1 has, as a driving unit 220 related to the vehicle speed, a traveling HST for performing traveling speed change. Here, the "HST" is a hydraulic continuously variable transmission device that employs a method of converting the hydraulic pressure generated by driving a hydraulic pump back into rotational force by a hydraulic motor. The HST has a variable displacement type pump and motor that are fluidly connected to each other, solenoid valves corresponding to the pump and the motor respectively, and an output shaft. In the HST, while receiving the power from the engine 11, the pump is adjustably driven (traveling drive adjustment) via the solenoid valve for the pump, and the drive of the motor due to the adjustment drive is transmitted to the output shaft.

[0109] The output shaft of the traveling HST is interlockingly connected to a transmission mechanism for transmitting the driving force to the left and right crawler units 3, 3 that constitute the traveling unit 2. This transmission mechanism is configured to include a planetary gear group and the like, and has left and right output shafts for transmitting the driving force to the drive sprockets 3b of the left and right crawler units 3.

[0110] The control device 200 receives the input of a detection signal regarding the forward and backward rotation operation position (operation amount) of the main speed change lever 17, generates control information based on the detection signal, and controls the drive of the driving unit 220 based on the generated control information. By operating the main speed change lever 17, the vehicle speed is adjusted. The operation amount of the main speed change lever 17 is detected by, for example, a rotary encoder or a rotary potentiometer. The control device 200 controls the drive of the pump and the motor by controlling the solenoid valve for the HST, and controls the power transmission from the output shaft to the transmission mechanism.

[0111] The combine harvester 1 is configured to be electrically connected to the output device (output circuit) of the control device 200, and has a monitor 211 and a buzzer 212 that generates a notification sound. The control device 200 has, as functional units, a monitor control unit that controls the monitor 211 and a buzzer control unit that controls the buzzer 212.

[0112] As shown in FIG. 11, the monitor 211 is provided at the central portion inside the annular handle main body portion 15a of the handle portion 15 disposed in front of the driver's seat 16 in the operation unit 14. The monitor 211 is, for example, a liquid crystal monitor having a touch panel function, and is a display unit that displays various situations of the combine 1 to an operator or the like. The buzzer 212 is a sound generation unit that generates an electronic sound, and includes an output unit such as a speaker as a portion that emits the electronic sound.

[0113] Based on the detection signal from the cutting height sensor 43, the control device 200 operates the cutting elevation cylinder 18 so that the cutting height is maintained at the cutting height target value, and performs elevation control of the cutting unit 5. The control device 200 controls the expansion and contraction operation of the cutting elevation cylinder 18 by controlling the operation of the electromagnetic valve 221 for hydraulic control of the cutting elevation cylinder 18.

[0114] A cutting height target value used for the elevation control of the cutting unit 5 is set and stored in the control device 200. The setting of the cutting height target value for the control device 200 is performed by the cutting height adjustment dial 202.

[0115] As shown in FIG. 11, the cutting height adjustment dial 202 is provided as one of the operation units of the operation unit group 300 provided on the upper surface portion of the side column 19 in the side operation unit 12 provided on the left side of the driver's seat 16 in the operation unit 14, and is operated by an operator sitting on the driver's seat 16. The cutting height adjustment dial 202 is an operating tool for stepwise adjusting the cutting height target value, and is provided as a cylindrical protrusion (knob) that is rotationally operated.

[0116] In this embodiment, the cutting height adjustment dial 202 is configured to be adjustable in five steps within a preset predetermined setting range, for example, within the range of 10 to 50 mm, as the cutting height target value. On the upper surface of the side column 19, a scale display portion 204 representing scales "1" to "5" regarding the rotation position of the cutting height adjustment dial 202 is provided around the cutting height adjustment dial 202. Regarding the setting of the cutting height target value by the cutting height adjustment dial 202, the cutting height corresponding to the scale "1" corresponds to the lowest cutting height in the setting range, and the cutting height corresponding to the scale "5" corresponds to the highest cutting height in the setting range.

[0117] As described above, the combine 1 includes a cutting unit 5 provided so as to be able to move up and down with respect to the traveling body 4, a cutting height detection device 40 for detecting the cutting height, a control device 200 as a control unit for controlling the cutting height based on a predetermined target value (cutting height target value) and the detection signal of the cutting height detection device 40, a cutting height adjustment dial 202 for setting the cutting height target value within a predetermined setting range, and a main speed change lever 17 as an operation member for performing a predetermined operation on the combine 1.

[0118] The lift control of the cutting unit 5 performed by the control device 200 in the combine 1 having the above configuration will be described. In the lift control of the cutting unit 5 according to this embodiment, for example, among the detection signals of the two cutting height detection devices 40 provided in the combine 1, the detection signal of the one that detects the lower cutting height is used. However, the usage mode of the two cutting height detection devices 40 is not particularly limited.

[0119] The control device 200 performs cutting height control including the above-described automatic cutting height control, which is control based on the detection signal of the cutting height detection device 40, as the lift control of the cutting unit 5. The cutting height control is performed during the cutting operation by the combine 1.

[0120] The control device 200 has, as control modes for the cutting height control, an automatic cutting height mode which is the first control mode for performing the above-described automatic control of the cutting height, and an automatic lift mode which is the second control mode for controlling the cutting unit 5 to rise to a constant height under a predetermined condition. Hereinafter, the cutting height control including these two control modes and based on the detection signal of the cutting height detection device 40 is referred to as "automatic cutting height control".

[0121] The automatic cutting height mode of the automatic cutting height control controls the height of the cutting unit 5 so that the cutting height detected by the cutting height detection device 40 becomes a predetermined target value (cutting height target value), and holds the height of the cutting unit 5 at a constant height with respect to the ground 30 during the cutting operation. The automatic lift mode of the automatic cutting height control is a mode in which, based on the cutting height detected by the cutting height detection device 40, when the height of the cutting unit 5 becomes lower than the set height with respect to the ground 30 during the cutting operation, the cutting unit 5 is raised to a constant height.

[0122] The automatic cutting height switch 205 functions as a mode switching switch for switching between the automatic cutting height mode and the automatic lift mode in the automatic cutting height control. As shown in FIG. 11, the automatic cutting height switch 205 is arranged in the operation unit group 300 in the vicinity of the cutting height adjustment dial 202 as an operation unit set with the cutting height adjustment dial 202. In the present embodiment, the automatic cutting height switch 205 is an operation unit to be pressed and is arranged in the vicinity of the right side (the lower side in FIG. 11) of the cutting height adjustment dial 202. In FIG. 11, the arrangement portions of the cutting height adjustment dial 202 and the automatic cutting height switch 205 are partially cut out and separately enlarged and shown.

[0123] Near the automatic cutting height switch 205, a mode display unit 206 indicating the current control mode is provided. The mode display unit 206 includes a first display unit 206a that displays the characters "Automatic Cutting Height" corresponding to the automatic cutting height mode, and a second display unit 206b that displays the characters "OK Lift" corresponding to the automatic lift mode. The first display unit 206a and the second display unit 206b are configured to be able to blink, and the display unit corresponding to the control mode selected by operating the automatic cutting height switch 205 is configured to light up. Also, by not selecting either the automatic cutting height mode or the automatic lift mode by operating the automatic cutting height switch 205, the automatic cutting height control is turned off. In the state where the automatic cutting height control is off, both the first display unit 206a and the second display unit 206b are turned off. That is, by operating the automatic cutting height switch 205, switching among three states is performed: the state of the automatic cutting height mode of the automatic cutting height control, the state of the automatic lift mode of the automatic cutting height control, and the state of the off of the automatic cutting height control.

[0124] When working in the automatic cutting height mode, with the engine 11 started, the automatic cutting height mode is selected by operating the automatic cutting height switch 205. In the state where the automatic cutting height mode is selected, the first display unit 206a lights up and the second display unit 206b is turned off. When the mowing operation is started in the state where the automatic cutting height mode is selected, during the mowing operation, the cutting height adjustment dial 202 is adjusted to one of the graduations from "1" to "5". In the example shown in FIG. 11, the cutting height adjustment dial 202 is set to the graduation of "3". Thereby, based on the detection signal of the cutting height detection device 40, with the cutting height corresponding to the graduation set by the cutting height adjustment dial 202 as the cutting height target value, the cutting height is controlled to be automatically held at the cutting height target value.

[0125] When operating in the automatic lift mode, with the engine 11 started, the automatic lift mode is selected by operating the automatic cutting height switch 205. When the automatic lift mode is selected, the second display unit 206b lights up and the first display unit 206a turns off. When the cutting operation is started in the selected automatic lift mode and it is detected during the cutting operation that the cutting height detected by the cutting height detection device 40 is equal to or less than the set height (for example, 10 mm), the cutting unit 5 is controlled to automatically rise by a predetermined amount (for example, 1 to 2 cm). Also, when the automatic lift mode is selected and the machine body is stopped during travel or it is detected that the cutting height detected by the cutting height detection device 40 is equal to or greater than another set height (for example, 20 mm), the control is such that the raising of the cutting unit 5 stops. The set height and the predetermined amount for the automatic lift mode are set and stored in advance in the control device 200.

[0126] [Operation part of the main transmission lever] The operation part of the main transmission lever 17 will be described with reference to FIG. 12. As shown in FIG. 12, the main transmission lever 17 has a rod-shaped lever main body part 17a having a predetermined shape and a gripping operation part 17b provided on the upper side of the lever main body part 17a. The main transmission lever 17 extends the lever main body part 17a upward from a lever guide part 240 provided on the upper surface part of the side column 19 (see FIG. 11).

[0127] The gripping operation part 17b is a part gripped by the operator, and an operation panel part 250 with various operation tools arranged is provided on the rear surface side of the upper part of the gripping operation part 17b. The operation panel part 250 is provided as a vertically long region part along the outer shape of the lever main body part 17a. The main transmission lever 17 is basically an operation tool operated by the left hand of the operator sitting in the driver's seat 16, and the various operation tools of the operation panel part 250 are mainly operated by the thumb of the left hand gripping the gripping operation part 17b.

[0128] As shown in FIG. 12, on the operation panel unit 250, in the lower right region, the mowing auto-lift switch 36 and the mowing auto-set switch 37 are arranged vertically one above the other. In the region at the lower end of the operation panel unit 250, a sub-shift switch 251 for shifting the vehicle speed to high speed is arranged.

[0129] Also, in the lower left region of the operation panel unit 250, a mowing unit lift switch 252 is provided. The mowing unit lift switch 252 is a vertically long seesaw-shaped switch, and its upper and lower parts are configured to be pressing parts for lowering and raising the mowing unit 5, respectively. In the region above the mowing auto-lift switch 36 on the operation panel unit 250, a feed chain operation button 253 for forcibly moving the feed chain, for example, when the vehicle body stops running, is arranged.

[0130] Also, in the region above the mowing unit lift switch 252 on the operation panel unit 250, a weeding depth adjustment switch 254 for adjusting the weeding depth in the threshing unit 6 is arranged. The depth adjustment switch 254 is a longitudinally long seesaw-shaped switch, and one side part and the other side part in the longitudinal direction are configured to be pressing parts for shallowing and deepening the weeding depth, respectively.

[0131] Also, in the upper right region of the operation panel unit 250, a mowing speed change button 255 for changing the speed of the mowing unit 5 is arranged. On the upper left side of the operation panel unit 250, a machine body control switch 256 is arranged. The machine body control switch 256 is configured to enable operations corresponding to the up, down, left, and right directions. By operating in the left and right directions, the left and right inclination of the vehicle body is adjusted, and by operating in the up and down directions, the vehicle height is adjusted up and down.

[0132] In the combine 1 having the above-described configuration, for example, as shown in FIG. 13, when entering the field with the machine body to perform the harvesting operation, when entering the field by descending the inclined land 260 inclined downward at the entrance of the field, there may be a case where the cutting height detection device 40 is in a state where the grounding body 42 is in contact with the ground in a rearward rotation state, but the rotation position of the grounding body 42 does not reach the rotation position until the cutting unit 5 is lifted, and when entering the field, the weed separating plate 21 of the cutting unit 5 may contact the ground or plunge into the ground.

[0133] In order to avoid the contact or plunge of the cutting unit 5 with the ground when entering the field, the cutting height adjustment dial 202 can be operated to make the cutting height target value relatively high. However, operating the cutting height adjustment dial 202 each time when entering the field is troublesome as an operation while running the machine body. That is, during normal operation by the combine 1, the cutting height adjustment dial 202 is often set to one of the graduations of "1" to "3", and when entering the field in that set state, in order to avoid the plunge of the cutting unit 5 into the ground, etc., it is necessary to set and operate the cutting height adjustment dial 202 to a graduation of, for example, "5", but such an operation is troublesome.

[0134] Therefore, the combine 1 is provided with a target value switching operation unit which is an operation unit for temporarily switching the cutting height target value to a predetermined value set in advance, giving priority to the setting of the cutting height target value by the cutting height adjustment dial 202. That is, when the cutting height target value set by the cutting height adjustment dial 202 is taken as the first target value, the target value switching operation unit switches the cutting height target value from the first target value to a second target value corresponding to a cutting height equal to or higher than the first target value by receiving a predetermined operation by the operator.

[0135] The second target value is, for example, the maximum value within the setting range of the cutting height target value by the cutting height adjustment dial 202. In the present embodiment, the maximum value within the setting range of the cutting height target value by the cutting height adjustment dial 202 is the cutting height corresponding to the graduation of "5", and the second target value is set to the cutting height corresponding to the graduation of "5" of the cutting height adjustment dial 202.

[0136] Note that the second target value may be, for example, the cutting height corresponding to the graduation of "4" of the cutting height adjustment dial 202. Further, the second target value may be, for example, a predetermined cutting height between the cutting height corresponding to the graduation of "4" and the cutting height corresponding to the graduation of "5", or a cutting height higher than the cutting height corresponding to the graduation of "5", etc. That is, the second target value may be a value other than the stepwise setting value set by the cutting height adjustment dial 202 or a value outside the setting range by the cutting height adjustment dial 202.

[0137] The target value switching operation unit is provided on the main transmission lever 17. In the present embodiment, the target value switching operation unit shares the cutting auto set switch 37 and the operating tool. As shown in FIG. 12, the cutting auto set switch 37 is a circular operation button 271 as an operating tool, and the target value switching operation unit is provided as a target value switching switch 270 using the operation button 271 as an operating tool. That is, the function as the target value switching switch 270 is assigned to the operation button 271, and the operation button 271 is used as an operating tool for both the cutting auto set switch 37 and the target value switching switch 270.

[0138] As shown in FIG. 10, the target value switching switch 270 is configured to be electrically connected to the input device of the control device 200 in the same manner as the cutting height adjustment dial 202, and is connected to the control device 200 with a configuration that shares the cutting auto set switch 37 and the operation button 271. The target value switching switch 270 switches the cutting height target value in the state of the automatic cutting height mode of the automatic cutting height control based on the detection value by the cutting height detection device 40 from the first target value to the second target value by receiving a predetermined operation.

[0139] The switching of the function of the operation button 271 is performed, for example, by a long-press operation of the operation button 271. That is, in a state where the cutting clutch is ON, by long-pressing the operation button 271 for a preset predetermined operation time (for example, 3 seconds), the operation button 271 switches from the operating tool of the cutting auto-set switch 37 to the operating tool of the target value switching switch 270. In this case, for example, if the pressing operation of the operation button 271 is an operation for less than the predetermined operation time, the operation button 271 functions as the operating tool of the cutting auto-set switch 37.

[0140] The target value switching switch 270 is provided as an operation unit that receives a pressing operation by using the operation button 271 as an operating tool. And the control device 200 holds a state in which the cutting height target value is switched from the first target value to the second target value during the pressing operation of the target value switching switch 270. That is, the control device 200 performs control (target value switching control) to forcibly set the cutting height target value in the automatic cutting height control to the second target value prior to the set value by the cutting height adjustment dial 202 while the operation button 271 functioning as the target value switching switch 270 is being pressed.

[0141] In addition, the control device 200 performs control to return the cutting height target value from the second target value to the first target value when the pressing operation of the target value switching switch 270 is released. That is, in the target value switching control, the control device 200 switches the cutting height target value so as to return from the second target value to the value (first target value) set by the cutting height adjustment dial 202 when the operation button 271 of the target value switching switch 270 becomes a non-operating state.

[0142] In addition, the combine 1 includes a notification unit for notifying that the cutting height target value has been switched from the first target value set by the cutting height adjustment dial 202 to the second target value by the target value switching switch 270 with respect to the switching of the cutting height target value by the target value switching switch 270.

[0143] As the notification unit, for example, the automatic cutting height switch 205 is used. In this case, the automatic cutting height switch 205 is configured to be able to blink. Specifically, as shown in FIG. 11, the automatic cutting height switch 205 has a character display unit 205b that displays the characters "cutting height" within a circular background portion 205a, and at least one of the background portion 205a and the character display unit 205b is configured to blink.

[0144] Then, when the target value switching control is performed by operating the target value switch 270, as shown in FIG. 14, the automatic cutting height switch 205 is in a lit state. That is, when the target value switch 270 is operated, the control device 200 controls the automatic cutting height switch 205 to turn on the automatic cutting height switch 205. Thereby, the operator is notified that the cutting height target value has been switched to the second target value. In the example shown in FIG. 14, the background portion 205a and the character display unit 205b are shown in a lit state. Note that the lighting mode of the automatic cutting height switch 205 is not limited.

[0145] Also, as the notification unit, the monitor 211 or the buzzer 212 may be used. When the monitor 211 is used as the notification unit, for example, characters for notification such as "changing cutting height target value" or "executing field entry mode" are displayed as a message for notifying the operator that the cutting height target value has been switched to the second target value at a predetermined location on the screen of the monitor 211. That is, when the target value switch 270 is operated, the control device 200 controls the monitor 211 so that the notification characters are displayed on the display screen of the monitor 211. Also, when the buzzer 212 is used as the notification unit, a predetermined notification sound is emitted by the buzzer 212. That is, when the target value switch 270 is operated, the control device 200 controls the buzzer 212 so that the buzzer 212 generates a notification sound.

[0146] Note that, as the notification unit, for example, a notification display lamp configured to emit light by a light source such as an LED (light-emitting diode) may be provided. The notification display lamp is provided, for example, in the vicinity of the operation panel unit 250 in the main shift lever 17, the vicinity of the handle unit 15, the peripheral edge of the monitor 211, or the like.

[0147] According to the combine 1 having the above configuration, in the configuration for automatically controlling the height of the cutting unit 5, good operability can be obtained for the operation to avoid contact or intrusion of the cutting unit 5 with respect to the ground when entering the field or the like. Regarding the achievement of such an effect, an example of the target value switching control by the target value switch 270 will be described. In this example, regarding the first target value, it is assumed that the cutting height adjustment dial 202 is set to the scale of "2". Further, in the combine 1, the automatic cutting height mode of the automatic cutting height control is selected by operating the automatic cutting height switch 205.

[0148] When the operator descends the sloping ground 260 that slopes downward at the entrance of the field and enters the field (see FIG. 13), at a stage before entering the field, the operator presses the operation button 271 at an appropriate timing. Here, the operator activates the target value switching control by the control device 200 by pressing and holding the operation button 271 for a predetermined operation time, and uses the operation button 271 as an operating tool for the target value switch 270. Further, the operator can press the operation button 271 with the left hand that holds the gripping operation portion 17b of the main shift lever 17.

[0149] When the target value switching control is started by operating the target value switch 270, the cutting height target value switches from the first target value corresponding to the scale of "2" on the cutting height adjustment dial 202 to the second target value. The second target value is a value corresponding to the scale of "5" on the cutting height adjustment dial 202 as described above. That is, by operating the target value switch 270, the cutting height target value is temporarily set to a value corresponding to the scale of "5".

[0150] During the target value switching control, when the cutting height target value becomes the second target value, regarding the rotation operation of the grounding body 42 of the cutting height detection device 40 that contacts the ground in the rearward rotation state when the machine body moves forward, the rotation amount from the state where the grounding body 42 is at the reference position to the rotation position where the cutting unit 5 is raised is minimized. As a result, the cutting unit 5 is controlled to rise with a slight rearward rotation amount of the grounding body 42 from the reference position. That is, the cutting unit 5 is controlled to move up and down so as to be held at the cutting height corresponding to the scale of "5".

[0151] Specifically, when the cutting height target value remains the first target value, as shown in Fig. 15A, the rearward rotation amount α1 of the grounding body 42 from the reference position until the control to raise the cutting unit 5 in the cutting height detection device 40 starts to take effect is relatively large, for example, about 50°. And the cutting height H1, which is the height relative to the ground held based on the first target value in the automatic cutting height control, is about 10 to 20 mm. If the machine enters the field in such a state, the cutting unit 5 may sink into the ground or the like.

[0152] On the other hand, when the cutting height target value is switched to the second target value by operating the target value switching switch 270, as shown in Fig. 15B, the rearward rotation amount α2 of the grounding body 42 from the reference position until the control to raise the cutting unit 5 in the cutting height detection device 40 starts to take effect is minimized, for example, about 10°. And the cutting height H2, which is the height relative to the ground held based on the second target value in the automatic cutting height control, is about 50 mm.

[0153] In addition, in Figs. 15A and 15B, the cutting heights H1 and H2 are shown as the heights from the ground 30 to the lower edge of the rib plate portion 122. Also, in Figs. 15A and 15B, the grounding body 42 at the reference position is shown by a two-dot chain line.

[0154] As shown in FIG. 15B, by controlling so that the cutting height is temporarily held at a high position based on the second target value, it is possible to avoid the cutting unit 5 from contacting the ground or digging into the ground when the combine 1 enters the field, and the combine 1 can smoothly enter the field.

[0155] After the combine 1 enters the field, by releasing the pressing operation of the target value switching switch 270, that is, by removing the finger from the operation button 271, the cutting height target value automatically returns from the second target value to the first target value. Since the first target value is the cutting height target value mainly used in normal cutting operations, it is possible to smoothly shift from entering the field to the cutting operation. In the target value switching control, when the first target value set by the cutting height adjustment dial 202 is the same as the second target value, the cutting height target value will not change.

[0156] As described above, according to the configuration in which the main transmission lever 17 is provided with the target value switching switch 270, it is not necessary to operate the cutting height adjustment dial 202 to change the cutting height target value to the ascending side when entering the field or the like. Therefore, it is possible to change the cutting height target value to the ascending side by operating the target value switching switch 270 without releasing the hand from the main transmission lever 17. Thereby, good operability can be obtained when temporarily changing the cutting height target value to the ascending side while maintaining the execution state of the automatic cutting height control.

[0157] Also, as the second target value of the target value switching control, the maximum value within the setting range of the cutting height target value by the cutting height adjustment dial 202 is used. According to such a configuration, since the cutting unit 5 can be raised to the maximum height in the automatic cutting height control by operating the target value switching switch 270, it is possible to effectively suppress the cutting unit 5 from digging into the ground or the like. In addition, since the existing set value can be used as the cutting height target value, the second target value can be easily set.

[0158] In addition, the target value switching switch 270 is provided on the main shift lever 17. According to such a configuration, while adjusting the vehicle speed by operating the main shift lever 17, the target value switching switch 270 can be operated by the hand holding the main shift lever 17, so that good operability can be obtained.

[0159] In addition, the target value switching switch 270 is configured as an operation unit that receives a pressing operation, and the control device 200 is configured to hold the state in which the cutting height target value is switched from the first target value to the second target value during the pressing operation of the target value switching switch 270. According to such a configuration, the operator can easily grasp the state in which the cutting height target value is switched by operating the target value switching switch 270, so that good operability can be obtained.

[0160] In addition, the control device 200 is configured to perform control to return the cutting height target value from the second target value to the first target value when the pressing operation of the target value switching switch 270 is released. According to such a configuration, the target value switching control can be terminated by a simple operation of releasing the finger from the operation button 271 of the target value switching switch 270, and the cutting height target value can be returned to the value set by the cutting height adjustment dial 202.

[0161] As described above, according to the control mode of the target value switching control by the target value switching switch 270 according to the present embodiment, good operability can be obtained for the switching operation of the cutting height target value.

[0162] Further, the target value switching switch 270 is configured to share the mowing auto set switch 37 and the operation button 271. According to such a configuration, the existing configuration can be utilized, and the target value switching switch 270 can be easily provided without separately providing operation tools such as buttons. Further, since the mowing auto set switch 37 is an operation unit related to the raising and lowering of the mowing unit 5, by assigning the function of the target value switching switch 270 to the operation button 271 of the mowing auto set switch 37, when the operator operates the target value switching switch 270, the target value switching control can be smoothly activated without impairing the existing operation feeling.

[0163] Further, the combine 1 includes a notification unit for notifying that the mowing height target value has been switched from the first target value to the second target value. According to such a configuration, it is possible to notify the operator that the target value switching control is in progress, so that the operator can easily grasp the current mowing height target value and obtain good operability.

[0164] The above-described embodiments are examples of the present invention, and the present invention is not limited to the above-described embodiments. Therefore, of course, various modifications can be made according to the design and the like as long as they do not deviate from the technical idea of the present invention even if they are other than the above-described embodiments. Further, the effects described in the present disclosure are merely examples and are not limited, and there may be other effects.

[0165] In the above-described embodiment, the operation member provided with the target value switching switch 270 is the main speed change lever 17, but the present invention is not limited to such a configuration. The target value switching switch 270 may be provided on another operation member provided on the operation unit 14, such as the handle main body 15a of the handle portion 15, for performing a predetermined operation on the combine 1.

[0166] In the above-described embodiment, the target value switching switch 270 is assigned to the operation button 271 of the mowing auto set switch 37. However, the present invention is not limited to such a configuration. The target value switching switch 270 may be assigned to an operating tool of another operating part provided in the operation panel part 250 of the main transmission lever 17, such as an operating tool of the mowing part lifting switch 252.

[0167] In the above-described embodiment, the control device 200 is configured to hold the execution state of the target value switching control during the pressing operation of the target value switching switch 270, and to end the target value switching control when the pressing operation of the target value switching switch 270 is released. However, the present invention is not limited to such a configuration. For example, the control device 200 may be configured to start the execution of the target value switching control when the target value switching switch 270 is long-pressed for a first operation time (for example, 3 seconds), and to end the target value switching control when the target value switching switch 270 is long-pressed for a second operation time (for example, 2 seconds) during the execution of the target value switching control.

[0168] The present technology can adopt the following configurations. Note that the configurations described below can be arbitrarily combined by making selections. (1) A harvester including a mowing part provided so as to be liftable with respect to a traveling machine body, a control part that controls the height of the mowing part based on a predetermined target value, a target value setting operation part for setting the target value within a predetermined setting range, an operation member for performing a predetermined operation on the harvester, and a target value switching operation part provided on the operation member for switching a first target value, which is the target value set by the target value setting operation part, to a second target value corresponding to a height of the mowing part equal to or higher than the first target value. A harvester characterized by the above. (2) The second target value is the maximum value within the setting range. The harvester according to the above (1), characterized in that... (3) The operation member is a main shift lever for performing the traveling operation of the traveling machine body. The harvester according to the above (1) or (2), characterized in that... (4) The target value switching operation unit is an operation unit that receives a pressing operation, During the pressing operation of the target value switching operation unit, the control unit holds the state in which the target value is switched from the first target value to the second target value. The harvester according to any one of the above (1) to (3), characterized in that... (5) When the pressing operation of the target value switching operation unit is released, the control unit performs control to return the target value from the second target value to the first target value. The harvester according to the above (4), characterized in that... (6) It is provided with an automatic setting operation unit for automatically positioning the cutting unit at a predetermined working position set in advance, The target value switching operation unit shares an operation tool with the automatic setting operation unit. The harvester according to any one of the above (1) to (5), characterized in that... (7) It is provided with a notification unit for notifying that the target value has been switched from the first target value to the second target value. The harvester according to any one of the above (1) to (6), characterized in that...

Explanation of Signs

[0169] 1 Combine (Harvester) 4 Traveling Machine Body 5 Cutting Unit 17 Main Shift Lever (Operation Member) 37 Cutting Auto-Set Switch (Automatic Setting Operation Unit) 200 Control Device (Control Unit) 202 Cutting Height Adjustment Dial (Target Value Setting Operation Unit) 205 Automatic Cutting Height Switch (Notification Unit) 211 Monitor (Notification Unit) 212 Buzzer (Notification Unit) 270 Target Value Switching Switch (Target Value Switching Operation Unit) 271 Operation Button (Operating Tool)

Claims

1. A harvester comprising a cutting unit provided so as to be able to move up and down with respect to a traveling machine body, a control unit that controls the height of the cutting unit based on a predetermined target value, a target value setting operation unit for setting the target value within a predetermined setting range, an operation member for performing a predetermined operation on the harvester, and a target value switching operation unit provided on the operation member for switching a first target value, which is the target value set by the target value setting operation unit, to a second target value corresponding to the height of the cutting unit that is equal to or greater than the first target value. A harvester characterized by the above.

2. The second target value is the maximum value within the setting range. The harvester according to claim 1, characterized by the above.

3. The operation member is a main speed change lever for performing a traveling operation of the traveling machine body. The harvester according to claim 1 or claim 2, characterized by the above.

4. The target value switching operation unit is an operation unit that receives a pressing operation, and the control unit holds a state in which the target value is switched from the first target value to the second target value during the pressing operation of the target value switching operation unit. The harvester according to claim 1, characterized by the above.

5. The control unit performs control to return the target value from the second target value to the first target value when the pressing operation of the target value switching operation unit is released. The harvester according to claim 4, characterized by the above.

6. It is provided with an automatic setting operation unit for automatically positioning the cutting unit at a predetermined working position set in advance, and the target value switching operation unit shares the automatic setting operation unit and an operating tool. The harvester according to claim 1, characterized by the above.

7. It is provided with a notification unit for notifying that the target value has been switched from the first target value to the second target value. The harvester according to claim 1, characterized by the above.

Images