Combine harvester

Abstract

To provide a combine harvester capable of reducing the frequency of the maintenance work of a cutting device by suppressing the collision of the front part of the cutting device with soil formed on the projecting part of a field.SOLUTION: The reaping and pre-processing device includes a raking device for conveying grain culms in a field rearward while erecting the grain culms, a cutter for cutting plant roots of the conveyed grain culms, an auger device for gathering the conveyed grain culms to one side, and a feeder-house side 3D for conveying the gathered grain culms to a thresher. The cutting device is formed of a pair of left and right rotary blade devices and a conveying device disposed above the rotary blade devices, a rear portion of a frame 21 supporting rotary blades of the rotary blade devices and extending in a front-rear direction is rotatably fixed to a support shaft, a detected portion extending rearward from the support shaft is formed at the rear portion of the frame, and a swing angle of the detected portion is measured by a sensor mounted on an auger frame 60.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a combine harvester equipped with a pre-harvest treatment device. [Background technology]

[0002] A conventional technology has been known in which a pre-harvest processing device is provided in front of the combine's threshing device, which transports the stalks in the field rearward while raising them up, a cutting device which cuts the base of the transported stalks, an auger device which gathers the transported stalks to one side, and a feeder house which transports the gathered stalks to the threshing device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-157280 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology of Patent Document 1, a sensor that measures the height of the cutting device from the field surface and a detector that moves along the unevenness of the field are provided at the rear of the cutting device, so there was a risk that the front of the cutting device would collide with soil formed on the convex parts of the field.

[0005] Therefore, the object of the present invention is to propose a combine that can prevent the front part of the cutting device from colliding with soil formed in convex parts of the field, thereby reducing the frequency of maintenance work on the cutting device. [Means for solving the problem]

[0006] The present invention, which has solved the above problems, is as follows. That is, the invention described in claim 1 is a combine harvester in which a traveling device (2) is provided under a machine frame (1), a pre-harvesting device (3) is provided in front of the machine frame (1), and a threshing device (4) is provided behind the pre-harvesting device (3), The pre-harvest processing device (3) is composed of a raking device (3A) that transports the culms in the field rearward while raising them upright, a cutting device (3B) that cuts the base of the transported culms, an auger device (3C) that gathers the transported culms to one side, and a feeder house (3D) that transports the gathered culms to a threshing device (4). A support shaft (25) extending in the left-right direction is provided on the lower wall of the auger frame (60) of the auger device (3C), and the cutting device (3B) is composed of a pair of left and right rotary blade devices (20), The combine is formed by a conveying device (30, 40) arranged above the rotary blade device (20), and the rear part of a frame (21) extending in the front-to-rear direction and supporting the rotary blade (22) of the rotary blade device (20) is rotatably fixed to a support shaft (25), and a detectable part (26) extending rearward from the support shaft (25) is formed at the rear of the frame (21), and the swing angle of the detectable part (26) is measured by a sensor (27) attached to the auger frame (60).

[0007] The invention described in claim 2 is the combine harvester described in claim 1, in which the pre-harvest treatment device (3) is raised and lowered based on the measurement value of the sensor (27).

[0008] The invention described in claim 3 is a combine described in claim 1 or 2, in which a cover (24) covering the lower part of the frame (21) is provided below the frame (21), and the lower part of the cover (24) is formed in a straight line when viewed from the side.

[0009] The invention as set forth in claim 4 is the combine harvester as set forth in claim 3, wherein the front part of the cover (24) is formed to be upwardly slanted in a side view.

[0010] The invention described in claim 5 is a combine described in claim 4, in which a regulating member (28) is provided on the lower wall of the auger frame (60), and when the front part of the frame (21) descends by more than a predetermined amount, the regulating member (28) engages with the rear part of the frame (21).

[0011] The invention described in claim 6 is a combine described in claim 5, in which the regulating member (28) is formed by a vertical portion extending downward from the lower wall of the auger frame (60) and a horizontal portion extending forward from the lower end of the vertical portion, the front surface of the vertical portion and the upper surface of the horizontal portion are fixed by a reinforcing member (28A) at a predetermined distance in the left-right direction, and the support shaft (25) is inserted through a connecting portion (21A) formed at the rear of the frame (21) and an opening formed in the reinforcing member (28A). [Effects of the Invention]

[0012] According to the invention of claim 1, the pre-harvest processing device (3) is composed of a raking device (3A) that transports the culms in the field backward while raising them up, a cutting device (3B) that cuts the base of the transported culms, an auger device (3C) that gathers the transported culms to one side, and a feeder house (3D) that transports the gathered culms to the threshing device (4). A support shaft (25) extending in the left-right direction is provided on the lower wall of the auger frame (60) of the auger device (3C), and the cutting device (3B) is composed of a pair of left and right rotary blade devices (20) and a feeder house (3D) that is disposed above the rotary blade device (20). The conveying device (30, 40) is formed by a frame (21) extending in the front-to-rear direction and supporting the rotary blade (22) of the rotary blade device (20). The rear part of the frame (21) is rotatably fixed to a support shaft (25). A detectable part (26) extending rearward from the support shaft (25) is formed at the rear of the frame (21). A sensor (27) attached to the auger frame (60) measures the swing angle of the detectable part (26). This prevents the front part of the cutting device (3B) from colliding with soil formed in a convex part in the field, thereby reducing the frequency of maintenance work on the cutting device (3B).

[0013] According to the invention of claim 2, in addition to the effect of the invention of claim 1, the pre-harvest treatment device (3) is raised and lowered based on the measurement value of the sensor (27), so that the pre-harvest treatment device (3) can be quickly moved up and down along the unevenness of the field, and the cutting device (3B) can be maintained at a predetermined height above the field surface.

[0014] According to the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, a cover (24) that covers the lower part of the frame (21) is provided on the lower side of the frame (21), and the lower part of the cover (24) is formed in a straight line in side view, so that the rotating shaft of the rotary blade (22) and the like are prevented from coming into contact with the field and soil is prevented from adhering to the rotating shaft and the like.

[0015] According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the front part of the cover (24) is formed to be upwardly oriented in a side view, so that the front part of the cover (24) is prevented from digging into the soil formed in a convex portion in the field, and the farm equipment can be moved smoothly across the field.

[0016] According to the invention of claim 5, in addition to the effect of the invention of claim 4, a regulating member (28) is provided on the lower wall of the auger frame (60), and when the front part of the frame (21) descends by more than a predetermined amount, the regulating member (28) engages with the rear part of the frame (21). This prevents the front part of the rotary blade (22) supported on the front part of the frame (21) from descending excessively, and prevents the front part of the rotary blade (22) from being excessively thrust into the soil of the field.

[0017] According to the invention of claim 6, in addition to the effects of the invention of claim 5, the regulating member (28) is formed of a vertical portion extending downward from the lower wall of the auger frame (60) and a horizontal portion extending forward from the lower end of the vertical portion, and the front surface of the vertical portion and the upper surface of the horizontal portion are fixed with reinforcing members (28A) at a predetermined distance in the left-right direction, and the support shaft (25) is inserted through a connecting portion (21A) formed at the rear of the frame (21) and an opening formed in the reinforcing member (28A), so that deformation of the horizontal portion of the regulating member (28) due to contact with the rear of the frame (21) can be prevented. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 1 is a plan view of a cutting device according to a first embodiment. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] 10A and 10B are explanatory diagrams of a method for attaching a restricting member. [Figure 9] FIG. 10 is a plan view of a cutting device according to a second embodiment. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 2 is an explanatory diagram of a conveyor device of the cutting device. [Figure 13] 1 is a transmission diagram of the engine output rotation. DETAILED DESCRIPTION OF THE INVENTION

[0019] As shown in Figures 1 to 3, a general-purpose combine harvester has a traveling device 2 consisting of a pair of left and right crawlers that travels on the soil surface on the underside of a body frame 1, a pre-harvesting processing device 3 that harvests stalks in the field on the front side of the body frame 1, a threshing device 4 that threshers and sorts the harvested stalks on the rear left side of the pre-harvesting processing device 3, and a control unit 5 on which an operator rides on on the rear right side of the pre-harvesting processing device 3.

[0020] An engine room 6 that houses the engine is provided below the control unit 5, a grain tank 7 that stores threshed and sorted grain is provided behind the control unit 5, and a discharge auger 8 that discharges the grain to the outside is provided behind the grain tank 7.

[0021] The pre-harvest processing device 3 is composed of a raking device 3A that transports the stalks in the field rearward while raising them upright, a cutting device 3B that cuts the base of the stalks that are transported to the rear and below the raking device 3A, an auger device 3C that gathers the stalks whose bases have been cut to the left, and a feeder house 3D that transports the gathered stalks to the threshing device 4.

[0022] <Scraping device> 4 and 5, the sweeping device 3A is provided on the front upper side of the auger frame 60 of the auger device 3C. The sweeping device 3A has approximately the same width as the auger frame 60 in the left-right direction.

[0023] The take-in device 3A is composed of a take-in reel 10 and an arm 11 that moves the take-in reel 10 up and down.

[0024] When viewed from the side, the take-up reel 10 is formed in an approximately hexagonal shape, and tine support rods 12 extending in the left-right direction are provided at six corners, and multiple reel tines 13 are suspended from the tine support rods 12 at predetermined intervals in the left-right direction.

[0025] A rotary shaft 14 extending in the left-right direction is mounted on the front of the arm 11, and the rotary shaft 14 supports the take-up reel 10. The rear of the arm 11 is rotatably fixed to the upper part of the rear wall of the auger frame 60 of the auger device 3C, and the arm 11 and the left wall of the auger frame 60 are connected at their intermediate portions by a lifting device such as a hydraulic cylinder that swings the front of the arm 11 up and down.

[0026] <Cutting device of first embodiment> 4 to 6, the cutting device 3B of the first embodiment is formed from a pair of left and right rotary blade devices 20 that cut the base of the stalk, and a pair of left and right lifter devices (referred to as "conveyor devices" in the claims) 30 provided above the rotary blade devices 20. The lifter devices 30 are devices that lift up the stalks that have been raked in by the raking device 3A.

[0027] The distance between the left-hand cutting device 3B and the right-hand cutting device 3B in the left-right direction is set to the distance between the rows in the field, which allows the rotary blade device 20 to efficiently cut the stalks planted in each row in the field.

[0028] The rotary blade device 20 is formed from a frame 21 extending in the front-to-rear direction, a rotary blade 22 provided on the upper front side of the frame 21, a motor 23 for rotating the rotary blade 22 provided on the upper rear side of the frame 21, and a cover 24 removably attached to the lower part of the frame 21.

[0029] The frame 21 of the rotary blade device 20 disposed on the left side extends from the rear toward the front right side, and the frame 21 of the rotary blade device 20 disposed on the right side extends from the rear toward the front left side.

[0030] The rotary blade 22 of the left rotary blade device 20 rotates clockwise, and the rotary blade 22 of the right rotary blade device 20 rotates counterclockwise. This prevents soil that comes into contact with the rotary blade 22 from scattering outside the auger frame 60.

[0031] A cover 24 covers the sprocket for the rotary blade supported on the lower part of the rotary shaft of the rotary blade 22, the sprocket for the motor supported on the lower part of the rotary shaft of the motor 23, and the chain wound around both sprockets. The rotary shaft of the rotary blade 22 and the rotary shaft of the motor 23 pass through the frame 21 and extend below the lower surface of the frame 21. This prevents the sprocket, chain, etc. from coming into contact with the field, and prevents soil from adhering to the sprocket and chain.

[0032] As shown in Figure 7, the rear part of the frame 21 is rotatably fixed to a support shaft 25 that extends in the left-right direction and is installed on the left and right walls of the auger frame 60. This allows the front part of the frame 21 to move up and down along the unevenness of the field, allowing the rotary blade 22 to efficiently cut the base of the stalk.

[0033] A detection target 26 extending rearward from the rear of the frame 21 is formed at the rear of the frame 21, and a pin 26A extending in the left-right direction is provided on the left surface of the rear of the detection target 26. A detector 27A of a sensor 27 such as a potentiometer attached to the auger frame 60 is fitted onto the outside of the pin 26A. This allows the frame 21 of the rotary blade device 20 to quickly measure the unevenness of the field, and the pre-harvesting treatment device 3 can be quickly moved up and down along the unevenness of the field to maintain the cutting device 3B at a predetermined height.

[0034] The lower side of the front part of the cover 24 is formed with an upward slope toward the front, which prevents the front part of the cover 24 from protruding into the unevenness of the field and allows the front part of the rotary blade device 20 to move up and down efficiently along the unevenness of the field.

[0035] The rotary blade 22 is positioned below the upper surface of the lower wall of the auger frame 60. This prevents a large amount of soil that comes into contact with the rotary blade 22 from entering the auger frame 60. Furthermore, when the raking device 3A is lowered, the tip of the reel tine 13 moves close to the upper surface of the rotary blade 22. This prevents head loss and allows the base of the stalk raked in by the raking device 3A to be cut and transported to the auger frame 60 efficiently.

[0036] A restricting member 28 is provided on the underside of the rear portion of the frame 21. This prevents the front portion of the frame 21 from descending excessively and coming into contact with the soil in the field when the pre-harvest treatment device 3 is raised.

[0037] As shown in Fig. 8, the restricting member 28, which has a predetermined length in the left-right direction, is fixed to the front portion of the lower wall of the auger frame 60 with fastening means such as bolts. The restricting member 28 is formed of an angle member or the like, and is connected by reinforcing members 28A at a predetermined left-right interval to a vertical portion extending downward from the front portion of the lower wall of the auger frame 60 and a horizontal portion extending forward from the lower end of the vertical portion. This prevents deformation of the horizontal portion of the restricting member 28 due to contact with the cover 24. The support shaft 25 is inserted through an opening formed in the connecting portion 21A at the rear of the frame 21 and an opening formed in the reinforcing member 28A.

[0038] As shown in Figures 4 to 6, the lifter device 30 is made up of a lifter 31 made of round steel and a sled 32 attached to the underside of the front of the lifter 31. The rear parts of the pair of left and right lifters 31 are preferably connected by a plate-shaped or comb-shaped cover 33. This makes it possible to reduce the amount of straw leaking into the field from the rear parts of the pair of left and right lifters 31, thereby suppressing head loss.

[0039] In side view, the lifter 31 extends upward from its front end, located in front of the rotary blade 22 of the rotary blade device 20, to above the motor 23, and then downward from the rear. The rear of the lifter 31 is rotatably fixed to a support shaft 34, which extends left and right and is located above and behind the support shaft 25. This allows the front of the lifter 31 to move up and down along the unevenness of the field, efficiently standing up the stalks raked in by the raking device 3A. In addition, the stalks, whose bases have been cut, can be efficiently guided to the auger device 3C.

[0040] In a plan view, the left part of the sled 32 extends from the front end toward the rear left side, and the right part of the sled 32 extends from the front end toward the rear right side. In a longitudinal cross-sectional view taken along the left-right direction, the left part of the sled 32 extends upward toward the left side, and the right part of the sled 32 extends upward toward the right side. This allows the sled 32 to move along the unevenness of the field, preventing the front part of the lifter 31 from penetrating the soil of the field.

[0041] <Cutting device of second embodiment> 9 to 11 show a cutting device 3B of the second embodiment. The same parts and members as those of the cutting device 3B of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0042] The cutting device 3B of the second embodiment is formed from a pair of left and right rotary blade devices 20 that cut the base of the stalk, and a pair of left and right conveyor devices (referred to as "transport devices" in the claims) 40 provided above the rotary blade devices 20. The lifter devices 40 are devices that lift up the stalks that have been raked in by the raking device 3A.

[0043] The conveyor device 40 is composed of a frame 41 extending in the front-rear direction at a predetermined interval in the left-right direction, a drive sprocket supported on a rotary shaft 42 provided at the rear of the frame 41 to which the output rotation of an engine is transmitted, a driven sprocket supported on a rotary shaft 43 provided at the front of the frame 41, and a chain wound around the drive sprocket and the driven sprocket. The rotary shaft 42 is located above and behind the support shaft 34.

[0044] The output rotation of the engine is transmitted to the rotary shaft 42 via a transmission part 60A extending in the front-to-rear direction and provided on the upper part of the left wall of the auger frame 60. The rotary shaft 42 is provided at the vertical center of the rear part of the frame 41, and the rotary shaft 43 is provided at the vertical center of the front part of the frame 41.

[0045] The chain is fitted with lugs 44 that transport the stalks at predetermined intervals. The lugs 44 rotate between an active area where they extend upward from the upper end of the frame 41 and move from the front to the rear of the frame 41 to transport the stalks, and a non-active area where they extend downward from the lower end of the frame 41 and move from the rear to the front of the frame 41.

[0046] The rear part of the conveyor device 40 is rotatably fixed to a rotary shaft 42, and a divider 45 that divides the stalks is provided at the front end of the conveyor device 40. This allows the front part of the conveyor device 40 to move up and down along the unevenness of the field, efficiently standing up the stalks raked in by the raking device 3A.

[0047] The right conveyor device 40 of the left cutting device 3B and the left conveyor device 40 of the right cutting device 3B are connected at their front-to-rear intermediate portions by a connecting member 46 made of round steel or the like extending in the left-right direction.

[0048] The connecting member 46 and the lower wall of the auger frame 60 are connected by a lifting device 47 such as a cylinder. This allows the conveyor device 40 to move up and down along the unevenness of the field, preventing the front of the frame 41 from encroaching excessively into the field.

[0049] It is preferable to connect the conveyor device 40 and the rear of the adjacent conveyor device 40, the left wall of the auger frame 60 and the rear of the conveyor device 40, and the rear of the conveyor device 40 and the right wall of the auger frame 60 with a plate-shaped or comb-shaped cover 48. This reduces the amount of straw that leaks into the field from the rear of the pair of left and right conveyor devices 40, etc., thereby suppressing head loss.

[0050] 12, the connecting member 46 can also be formed from a cylindrical pipe member 46A, a rod-shaped connecting member 46L extending rightward from the right conveyor device 40 in the left cutting device 3B, and a rod-shaped connecting member 46R extending leftward from the left conveyor device 40 in the right cutting device 3B. The connecting members 46L and 46R are fitted into the pipe member 46A so as to be slidable in the left-right direction, and the pipe member 46A and the connecting members 46L and 46R are fixed in predetermined positions by fixing members 46B such as removable lock pins.

[0051] The rotating shaft 42 is divided into rotating shaft 42L and rotating shaft 42R, and an engaging member 42A is provided on the right side of rotating shaft 42L to engage with an engaging portion such as a spline formed on the left side of rotating shaft 42R. This makes it possible to easily adjust the distance between the right conveyor device 40 in the left cutting device 3B and the left conveyor device 40 in the right cutting device 3B to match the row spacing in the field.

[0052] In this case, the pipe member 46A and the lower wall of the auger frame 60 are connected by a lifting device 47 such as a cylinder. This allows the conveyor device 40 to move up and down along the unevenness of the field, preventing the front part of the frame 41 from encroaching excessively into the field.

[0053] As shown in Figure 13, the output rotation of the engine is transmitted to 70. The output rotation transmitted to the rotating shaft 70 is transmitted to the feeder house 3D via sockets 70A and 70B, and is then transmitted to the rotating shaft 71 via socket 70C.

[0054] The output rotation transmitted to the rotary shaft 71 is transmitted to the auger device 3C via a sprocket 71A to rotate the raking auger 61. It is also transmitted to the rotary shaft 72 via a sprocket 71B.

[0055] The output rotation transmitted to the rotary shaft 72 is transmitted to the rotary shaft 73 via a sprocket 72A, and is then transmitted to the rotary shaft 14 of the take-in device 3A via a sprocket 72B, causing the take-in reel 10 to rotate.

[0056] The output rotation transmitted to the rotary shaft 73 is transmitted to the rotary shaft 42L of the cutting device 3B via sprockets 73A and 42B, and drives the conveyor device 40 disposed above the left cutting device 3B.

[0057] The output rotation transmitted to the rotary shaft 42L is transmitted to the rotary shaft 42R via the engaging member 42A. The output rotation transmitted to the rotary shaft 42R drives the conveyor device 40 located above the right-side cutting device 3B. Although the rotary blade device 20 of the illustrated cutting device 3B is rotated by an electric motor, it can also be rotated by transmitting the output rotation of an engine.

[0058] When the peripheral speed of the tip of the reel tine 13 of the take-in reel 10 increases or decreases, it is preferable to increase or decrease the moving speed of the lug 44 of the conveyor device 40. This allows the stalks taken in by the take-in reel 10 to be efficiently transferred from the reel tine 13 to the lug 44. Furthermore, when the traveling speed of the traveling device 2 increases or decreases, it is more preferable to increase or decrease the peripheral speed of the tip of the reel tine 13 of the raking reel 10 and the moving speed of the lug 44 of the conveyor device 40. This allows the raking reel 10 to rake in the stalks in the field more efficiently.

[0059] It is preferable to provide a gauge wheel device 50 that moves along the unevenness of the field between the right conveyor device 40 of the left cutting device 3B and the left conveyor device 40 of the right cutting device 3B.

[0060] The gauge wheel device 50 is formed from a gauge wheel 51 that travels on the field and a frame 52 that supports the gauge wheel 51, and the rear part of the frame 52 is fixed to the rotary shaft 42 so as to be freely rotatable.

[0061] <Auger device> As shown in FIG. 6, the auger device 3C is composed of an auger frame 60 and a scraping auger 61 installed on the left and right walls of the auger frame 60.

[0062] The auger frame 60 is formed of a lower wall, a left wall erected on the left portion of the lower wall, a right wall erected on the right portion of the lower wall, and a rear wall connecting the rear portion of the lower wall to the left and right walls. An inlet (not shown) for transporting the stalks to the feeder house 3D is formed on the left side of the rear wall. In side view, the lower wall of the auger frame 60 is formed in a gently curved shape that protrudes downward.

[0063] A plurality of raking fingers 62 that can freely appear and disappear from the outer peripheral surface are provided on the left side of the outer peripheral surface of the raking auger 61. This allows the grain straw that has gathered in front of the inlet of the auger frame 60 to be efficiently transported to the feeder house 3D.

[0064] A plurality of conveying spirals 63 are provided on the right side of the outer peripheral surface of the raking auger 61. This allows the grain straw conveyed to the auger frame 60 to be efficiently gathered in front of the inlet.

[0065] <Feeder House> As shown in FIG. 2, the feeder house 3D connects the auger device 3C and the threshing device 4, and is a device that transports the grain stalks, which are the material to be processed and are transported to the left part of the auger frame 60, to the threshing device 4. [Explanation of symbols]

[0066] 1 Aircraft frame 2 Running gear 3 Pre-harvest processing equipment 3A scraping device 3B Cutting device 3C Auger Device 3D Feeder House 4. Threshing equipment 20 Rotary blade device 21 frames 21A Connection part 22 Rotary blade 24 Cover 25 Spindle 26 Detected part 27 Sensors 28 Regulatory Members 28A Reinforcement member 30 Lifter device (transport device) 40 Conveyor equipment (transport equipment) 60 Ogre Frame

Claims

1. A combine harvester having a traveling device (2) provided below a machine frame (1), a pre-harvesting device (3) provided in front of the machine frame (1), and a threshing device (4) provided behind the pre-harvesting device (3), The pre-harvesting treatment device (3) is composed of a raking device (3A) that transports the culms in the field backward while raising them upright, a cutting device (3B) that cuts the bases of the transported culms, an auger device (3C) that gathers the transported culms to one side, and a feeder house (3D) that transports the gathered culms to a threshing device (4), a support shaft (25) extending in the left-right direction is provided on the lower wall of the auger frame (60) of the auger device (3C); The cutting device (3B) is formed by a pair of left and right rotary blade devices (20) and a conveying device (30, 40) arranged above the rotary blade devices (20), a rear portion of a frame (21) extending in the front-rear direction and supporting a rotary blade (22) of the rotary blade device (20) is rotatably fixed to a support shaft (25), and a detection target portion (26) extending rearward beyond the support shaft (25) is formed at the rear of the frame (21); The combine harvester is characterized in that a sensor (27) attached to the auger frame (60) measures the swing angle of the detection target part (26).

2. 2. The combine harvester according to claim 1, wherein the pre-harvest treatment device (3) is raised and lowered based on the measurement value of a sensor (27).

3. A cover (24) is provided below the frame (21) to cover the lower part of the frame (21), 3. The combine harvester according to claim 1, wherein the lower portion of the cover (24) is formed in a straight line in a side view.

4. 4. A combine harvester according to claim 3, wherein a front portion of the cover (24) is formed to be upwardly oriented in a side view.

5. A restricting member (28) is provided on the lower wall of the auger frame (60), 5. A combine harvester according to claim 4, wherein the regulating member (28) is adapted to engage with the rear portion of the frame (21) when the front portion of the frame (21) is lowered by a predetermined amount or more.

6. The regulating member (28) is formed by a vertical portion extending downward from the lower wall of the auger frame (60) and a horizontal portion extending forward from the lower end of the vertical portion, The front surface of the vertical portion and the upper surface of the horizontal portion are fixed with reinforcing members (28A) at a predetermined interval in the left-right direction, 6. A combine harvester according to claim 5, wherein the support shaft (25) is inserted through a connecting portion (21A) formed at the rear of the frame (21) and an opening formed in a reinforcing member (28A).

Images