combine

Abstract

This combine harvester can improve the safety of the working environment by stopping the operation of the straw conveying device and the shredding cutter when the combine is stopped or reversing. [Solution] A continuously variable transmission (40) is provided between the transmission path of the engine (E) and the travel device (2), a threshing clutch (43) is provided between the transmission path of the engine (E) and the threshing device (4), a harvesting clutch (42) is provided between the transmission path of the continuously variable transmission (40) and the harvesting device (3), a straw conveying device (35) and a shredding cutter (38) are provided at the rear of the threshing device (4), a shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5), and the controller (90) releases the threshing clutch (43) when the harvesting lever (18) is operated to engage the threshing clutch (43) and the shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40).

Description

Technical Field

[0001] The present invention relates to a combine harvester provided with a straw conveying device for conveying straw and grain straw to the rear of a threshing device, and a shredding cutter for shredding the straw and grain straw falling from the straw conveying device.

Background Art

[0002] In a conventional combine harvester, in order to prevent the straw and grain straw discharged from the straw conveying device of the threshing device from accumulating on the field and piling up when the combine harvester stops, a technique is known in which a shredding cutter is provided below the straw conveying device to shred the straw and grain straw falling from the straw conveying device and discharge it to the outside. (See Patent Document 1)

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technique of Patent Document 1, there is a risk that an operator may accidentally come into contact with the straw conveying device or the shredding cutter and get injured when the combine harvester stops.

[0005] Therefore, the main problem of the present invention is to provide a combine harvester that can improve the safety of the working environment by stopping the driving of the straw conveying device and the shredding cutter when the combine harvester stops or moves backward.

Means for Solving the Problems

[0006] The present invention that solves the above problems is as follows.

[0007] The invention according to claim 1 described is In a combine harvester having a machine frame (1) equipped with an engine (E), a traveling device (2) for traveling in a field located below it, a harvesting device (3) for cutting grain stalks located at the front of the machine frame (1), a threshing device (4) for threshing and sorting the grain stalks located to the left rear of the harvesting device (3), a control unit (5) for the operator to sit in located to the right rear of the harvesting device (3), and a grain tank (7) for storing the threshed and sorted grain located behind the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) for conveying the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) for shredding the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5). The threshing clutch (43) is formed by a main clutch (43A) located between the engine (E) and the straw conveying device (35) and a sub-clutch (43B) located between the main clutch (43A) and the shredding cutter (38), combine harvester The controller (90) disengages the sub-clutch (43B) when the threshing lever (18) is operated to engage the threshing clutch (43) and the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), and then disengages the main clutch (43A) after a predetermined time has elapsed. Characterized by It's a combine harvester.

[0008] Claim 2 The invention described is, In a combine harvester having a machine frame (1) equipped with an engine (E), a traveling device (2) for traveling in a field located below it, a harvesting device (3) for cutting grain stalks located at the front of the machine frame (1), a threshing device (4) for threshing and sorting the grain stalks located to the left rear of the harvesting device (3), a control unit (5) for the operator to sit in located to the right rear of the harvesting device (3), and a grain tank (7) for storing the threshed and sorted grain located behind the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) for conveying the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) for shredding the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5). A layer thickness sensor (22A) is provided to measure the layer thickness of the grain being transported on the transfer shelf (25A) of the oscillating sorting device (25) located below the threshing drum (21) of the threshing device (4), and combine harvester The controller (90) disengages the threshing clutch (43) when the threshing lever (18) is operated to engage the threshing clutch (43), the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), and the measured value of the layer thickness sensor (22A) is thinner than a predetermined layer thickness set in advance. Characterized by It's a combine harvester.

[0009] Claim 3 The invention described is, In a combine harvester having a machine frame (1) equipped with an engine (E), a traveling device (2) for traveling in a field located below it, a harvesting device (3) for cutting grain stalks located at the front of the machine frame (1), a threshing device (4) for threshing and sorting the grain stalks located to the left rear of the harvesting device (3), a control unit (5) for the operator to sit in located to the right rear of the harvesting device (3), and a grain tank (7) for storing the threshed and sorted grain located behind the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) for conveying the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) for shredding the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5). A weight sensor (7A) is provided to measure the weight of grain stored in the grain tank (7), combine harvester The controller (90) disengages the threshing clutch (43) when the threshing lever (18) is operated to engage the threshing clutch (43), the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), and the measured value of the weight sensor (7A) does not increase for a predetermined period of time. Characterized by It's a combine harvester.

[0010] Claim 4 The invention described is, In a combine harvester having a machine frame (1) equipped with an engine (E), a traveling device (2) for traveling in a field located below it, a harvesting device (3) for cutting grain stalks located at the front of the machine frame (1), a threshing device (4) for threshing and sorting the grain stalks located to the left rear of the harvesting device (3), a control unit (5) for the operator to sit in located to the right rear of the harvesting device (3), and a grain tank (7) for storing the threshed and sorted grain located behind the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) for conveying the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) for shredding the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5). A feed chain (20) is provided to transport the grain stalks harvested by the harvesting device (3) to the threshing device (4), combine harvester When the cutting lever (18) is operated to engage the cutting clutch (42) and the threshing clutch (43), and the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), the controller (90) disengages the cutting clutch (42), disengages the front chain clutch (61) located between the engine (E) and the transmission path of the front rotating shaft (62) that supports the front sprocket (62A) that tensions the front part of the feed chain (20), engages the rear chain clutch (54) located between the engine (E) and the transmission path of the rear rotating shaft (55) that supports the rear sprocket (55A) that tensions the rear part of the feed chain (20), and disengages the threshing clutch (43) after a predetermined time has elapsed. Characterized by It's a combine harvester.

[0011] Claim 5 The invention described is characterized in that the control unit (5) is provided with a hand-operating switch (19) that switches from a work mode in which the harvesting device (3) harvests grain stalks to a hand-operating mode in which an operator manually harvests grain stalks, and the controller (90) restricts the disengagement of the threshing clutch (43) when the hand-operating switch (19) is pressed and the system is switched to hand-operating mode. 4 This is the combine harvester described.

[0012] Claim 6 The invention described is characterized in that the control unit (5) is equipped with a scraping pedal (14) that switches to a scraping mode in which the grain stalks accumulated in the harvesting device (3) and threshing device (4) are threshed and sorted by the threshing device (4), and the controller (90) restricts the release of the threshing clutch (43) when the scraping pedal (14) is pressed and the system is switched to scraping mode. 4It is the combine harvester described.

Advantages of the Invention

[0013]

[0014] Claim 1 According to the invention described A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) to convey the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) to shred the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5). The threshing clutch (43) is formed by a main clutch (43A) arranged between the engine (E) and the transmission path of the straw discharge conveyor (35), and a sub clutch (43B) arranged between the main clutch (43A) and the transmission path of the shredding cutter (38). combine harvester When the reaping lever (18) is operated to a position where the threshing clutch (43) is engaged and the shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), the controller (90) releases the engagement of the sub clutch (43B), and then releases the engagement of the main clutch (43A) after a preset predetermined time has elapsed. Therefore, When the combine harvester is stopped or moving in reverse, the drive of the straw conveying device (35) and the shredding cutter (38) stops, ensuring a high level of safety in the working environment. It is possible to reduce a sudden change in the load applied to the engine (E), suppress disturbances applied to the controller (90), and perform control efficiently.

[0015] Claim 2 According to the invention described A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) to convey the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) to shred the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5). A layer thickness sensor (22A) for measuring the layer thickness of the grains being transferred on the transfer shelf (25A) of the swing sorting device (25) arranged below the handling cylinder (21) of the threshing device (4) is provided. combine harvester When the reaping lever (18) is operated to a position where the threshing clutch (43) is engaged, the shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), and the measured value of the layer thickness sensor (22A) is thinner than a preset predetermined layer thickness, the controller (90) releases the engagement of the threshing clutch (43). Therefore, When the combine harvester is stopped or moving in reverse, the drive of the straw conveying device (35) and the shredding cutter (38) stops, ensuring a high level of safety in the working environment. It is possible to suppress the discharge amount (third loss) of the grains to which branches and the like adhering are discharged to the outside by the dust exhaust fan provided behind the swing sorting device (25).

[0016] Claim 3 According to the invention described A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) to convey the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) to shred the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5).A weight sensor (7A) is installed in the grain tank (7) to measure the weight of the grain stored there. combine harvester The controller (90) disengages the threshing clutch (43) when the threshing lever (18) is operated to engage the threshing clutch (43), the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), and the measured value of the weight sensor (7A) does not increase for a predetermined period of time. When the combine harvester is stopped or moving in reverse, the drive of the straw conveying device (35) and the shredding cutter (38) stops, ensuring a high level of safety in the working environment. The amount of grain with attached stems and other debris (third loss) discharged to the outside by the dust removal fan located behind the oscillating sorting device (25) can be further suppressed.

[0017] Claim 4 According to the invention described A continuously variable transmission (40) is provided between the engine (E) and the drivetrain (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation; a threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path; a harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path; a straw conveying device (35) is provided at the rear of the threshing device (4) to convey the threshed and sorted straw stalks to the rear; a shredding cutter (38) is provided below the straw conveying device (35) to shred the straw stalks falling from the straw conveying device (35); a gear shift lever (16) for operating the continuously variable transmission (40) and a harvesting lever (18) for operating the threshing clutch (43) and harvesting clutch (42) are provided on the control unit (5). A feed chain (20) is provided to transport the grain stalks harvested by the harvesting device (3) to the threshing device (4). combine harvester When the cutting lever (18) is operated to engage the cutting clutch (42) and the threshing clutch (43), and the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), the controller (90) disengages the cutting clutch (42), disengages the front chain clutch (61) located between the engine (E) and the transmission path of the front rotating shaft (62) that supports the front sprocket (62A) that tensions the front part of the feed chain (20), engages the rear chain clutch (54) located between the engine (E) and the transmission path of the rear rotating shaft (55) that supports the rear sprocket (55A) that tensions the rear part of the feed chain (20), and disengages the threshing clutch (43) after a predetermined time has elapsed. When the combine harvester is stopped or moving in reverse, the drive of the straw conveying device (35) and the shredding cutter (38) stops, ensuring a high level of safety in the working environment. The output rotation of the engine (E) is transmitted to the feed chain (20) via a rear sprocket (55A) supported by a rear rotating shaft (55), allowing the harvesting device (3) and the grain stalks accumulated on the feed chain (20) to be transported to the threshing device (4) for threshing and sorting, thereby suppressing grain recovery loss. Furthermore, when the traveling device (2) moves forward, the feed chain (20) is driven in conjunction with the harvesting device (3), allowing harvesting work to be quickly resumed.

[0018] Claim 5According to the invention described, 4 In addition to the effects of the invention described above, the control unit (5) is provided with a manual operation switch (19) that switches from the operation mode in which the harvesting device (3) harvests the grain stalks to the manual operation mode in which the operator manually harvests the grain stalks. The controller (90) restricts the release of the threshing clutch (43) when the manual operation switch (19) is pressed and the system is switched to the manual operation mode, so that the grain stalks harvested manually by the operator can be threshed and sorted by the threshing device (4).

[0019] Claim 6 According to the invention described, 4 In addition to the effects of the invention described above, the control unit (5) is provided with a scraping pedal (14) that switches to a scraping mode in which the grain stalks accumulated in the harvesting device (3) and threshing device (4) are threshed and sorted by the threshing device (4). The controller (90) restricts the release of the threshing clutch (43) when the scraping pedal (14) is pressed and the system is switched to scraping mode. This allows the grain stalks accumulated in the harvesting device (3) and threshing device (4) to be threshed and sorted by the threshing device (4), thereby suppressing the loss of recovered grain. [Brief explanation of the drawing]

[0020] [Figure 1] This is a front view of a combine harvester. [Figure 2] This is a left side view of a combine harvester. [Figure 3] This is a plan view of a combine harvester. [Figure 4] This is a longitudinal cross-sectional view of the threshing machine in the front-to-back direction. [Figure 5] This is a cross-sectional view of the threshing machine in the front-to-back direction. [Figure 6] This is a diagram showing the power transmission configuration of the engine. [Figure 7] This is a power output / speed transmission diagram for the engine. [Figure 8] This is a perspective view of the motor side of the threshing clutch. [Figure 9] This is a perspective view of the arm side of the threshing clutch. [Figure 10] This is a connection diagram for the controller. [Figure 11] This is a diagram illustrating how to operate the threshing clutch. [Modes for carrying out the invention]

[0021] As shown in Figures 1 and 2, the combine harvester has a running device 2 consisting of a pair of left and right crawlers that travel on the field, located on the underside of the machine frame 1; a harvesting device 3 for cutting grain stalks in the field, located on the front of the machine frame 1; a threshing device 4 for threshing and sorting the harvested grain stalks, located on the rear left side of the harvesting device 3; and a control unit 5 for the operator, located on the rear right side of the harvesting device 3.

[0022] Below the control unit 5 is an engine room 6 where the engine E is mounted, and behind the control unit 5 is a grain tank 7 for storing threshed and sorted grain, and behind the grain tank 7 is a discharge auger 8 consisting of a vertically extending grain lifting section and a horizontally extending front-to-back discharge section for discharging grain to the outside.

[0023] As shown in Figure 3, a front panel 11 is provided in front of the cockpit 10 of the control unit 5. A touch panel monitor 12 is provided in the center of the front panel 11 to display the output rotation of the engine E and the travel speed of the travel device 2, etc. An operating lever 13 for operating the turning of the travel device 2 and the raising and lowering of the harvesting device 3 is provided to the right of the monitor 12. A scraping pedal 14 is provided on the step below the front panel 11 to switch to scraping mode, which transports grain stalks that have accumulated in the harvesting device 3 and threshing device 4 at the edge of the ridges during headwood harvesting to the threshing device 4 for threshing and sorting. The amount of pressure applied to the scraping pedal 14 is measured by an angle sensor 14A such as a potentiometer attached to the base of the scraping pedal 14.

[0024] When the operating lever 13 is tilted forward, the harvesting device 3 descends to the harvesting position, and when it is tilted backward, the harvesting device 3 rises to the retraction position. Also, when the operating lever 13 is tilted to the left, the traveling device 2 turns to the left, and when it is tilted to the right, the traveling device 2 turns to the right. The operating position of the operating lever 13 is measured by an angle sensor such as a potentiometer attached to the base of the operating lever 13.

[0025] A side panel 15 is provided on the left side of the cockpit 10. A main shift lever (the "shift lever" in the claims) 16 is provided at the front of the side panel 15 to operate the continuously variable transmission 40 shown in Figure 6 to increase or decrease the travel speed of the travel device 2. The operating position of the main shift lever 16 is measured by an angle sensor 16A, such as a potentiometer, attached to the base of the main shift lever 16.

[0026] A sub-shift lever 17 is provided to the right rear of the main shift lever 16, which operates the transmission 41 shown in Figure 6 to increase or decrease the travel speed of the travel device 2. The operating position of the sub-shift lever 17 is measured by an angle sensor such as a potentiometer attached to the base of the sub-shift lever 17.

[0027] To the left of the sub-transmission lever 17 is a harvesting / threshing lever 18, which is used to connect and disconnect the harvesting clutch 42 and the threshing clutch 43 as shown in Figure 6. The operating position of the harvesting / threshing lever 18 is measured by an angle sensor 18A, such as a potentiometer, attached to the base of the harvesting / threshing lever 18.

[0028] Behind the cutting lever 18, there is a discharge lever (not shown) for operating the discharge clutch 44 shown in Figure 6 to engage and disengage it. The operating position of the discharge lever is measured by an angle sensor such as a potentiometer attached to the base of the discharge lever.

[0029] To the right of the main gear shift lever 16 is a manual switch 19 for switching to manual mode, in which the operator manually transports the harvested grain stalks to the threshing device 4 for threshing.

[0030] When the main shift lever 16 is in the neutral position, the output rotation of the continuously variable transmission 40, which switches the speed of the engine E's output rotation and its direction of rotation, becomes zero. When the main shift lever 16 is moved from the neutral position to the forward tilt position, the output rotation of the continuously variable transmission 40 is increased or decreased according to the angle of the forward tilt position, and the direction of rotation of the continuously variable transmission 40's output rotation becomes the same forward rotation as the direction of rotation of the engine E's output rotation. Furthermore, when the main shift lever 16 is moved from the neutral position to the rearward tilt position, the output rotation of the continuously variable transmission 40 is increased or decreased according to the angle of the rearward tilt position, and the direction of rotation of the continuously variable transmission 40's output rotation becomes the opposite of the direction of rotation of the engine E's output rotation.

[0031] When the sub-transmission lever 17 is tilted forward, the gear switches to a high-speed gear and the output rotation of the transmission 41 is increased. When the sub-transmission lever 17 is tilted backward, the gear switches to a low-speed gear and the output rotation of the transmission 41 is reduced.

[0032] When the harvesting lever 18 is tilted forward, the harvesting clutch 42 and the threshing clutch 43 are disengaged, and when the harvesting lever 18 is tilted backward, the harvesting clutch 42 and the threshing clutch 43 are engaged. Also, when the harvesting lever 18 is placed in a neutral position between the forward and backward tilting positions, the harvesting clutch 42 is disengaged and the threshing clutch 43 is engaged.

[0033] When the harvesting clutch 42 is engaged, the output rotation of the engine E is transmitted to the harvesting device 3, and the harvesting device 3 is driven. When the harvesting clutch 42 is disengaged, the transmission of the output rotation of the engine E to the harvesting device 3 is cut off, and the harvesting device 3 stops. Similarly, when the threshing clutch 43 is engaged, the output rotation of the engine E is transmitted to the threshing device 4, and the threshing device 4 is driven. When the threshing clutch 43 is disengaged, the transmission of the output rotation of the engine E to the threshing device 4 is cut off, and the threshing device 4 stops.

[0034] When the discharge lever is tilted forward, the discharge clutch 44 is disengaged, and when the discharge lever is tilted backward, the discharge clutch 44 is engaged. When the discharge clutch 44 is engaged, the output rotation of the engine E is transmitted to the discharge auger 8, driving the discharge auger 8. When the discharge clutch 44 is disengaged, the transmission of the output rotation of the engine E to the discharge auger 8 is cut off, and the discharge auger 8 stops.

[0035] As shown in Figures 4 and 5, the threshing device 4 is equipped with a threshing cylinder 21 at its upper part for threshing the stalks of grain transported from the harvesting device 3 by the feed chain 20. Below the threshing cylinder 21 is a receiving net 22, and below the receiving net 22 is a layer thickness sensor 22A that measures the layer thickness of the grain being transported on the upper surface of the transport rack 25A of the oscillating sorting device 25, which sorts the grain processed by the threshing cylinder 21. The feed chain 20 is provided along a threshing opening that extends in the front-to-back direction and is formed on the left wall of the threshing device 4.

[0036] The upper part of the threshing drum 21 is covered by a threshing drum cover 23. A clamping culm 24, which is biased toward the feed chain 20, is provided at the lower part of the left wall of the threshing drum cover 23.

[0037] The upper part of the oscillating sorting device 25 is equipped with, in order from the front, a transfer rack 25A made of plate-like bodies, a fixed sheave 25B made of multiple plate-like bodies arranged at predetermined intervals in the front-to-back direction with an upward sloping rearward inclination, a variable sheave 25C made of multiple plate-like bodies arranged at predetermined intervals in the front-to-back direction with a variable upward sloping rearward inclination angle, and a straw rack 25D made of multiple plate-like bodies arranged at predetermined intervals in the left-to-right direction. The lower part of the oscillating sorting device 25 is equipped with a sorting net 25E for sorting grains that leak down from the fixed sheave 25B and the variable sheave 25C.

[0038] Below the oscillating sorting device 25, in order from the front, there is a winnowing machine 26 that blows sorting air toward the fixed sieve 25B and the variable sieve 25C, a first receiving tub 27 that collects grains that leak down from the fixed sieve 25B and the variable sieve 25C, and a second receiving tub 28 that collects grains (second grade) with branches and stems attached that leak down from the straw rack 25D.

[0039] The grain collected in the first receiving tub 27 is lifted into the grain tank 7 by the first lifting cylinder 30, and the second grain collected in the second receiving tub 27 is lifted into the second processing cylinder 32, which is located to the right of the threshing cylinder 21, by the second lifting cylinder 31. A conveying spiral 32A is provided on the outer circumference of the second processing cylinder 32 to transport the second grain forward. The grain tank 7 is equipped with a weight sensor 7A to measure the weight of the stored grain.

[0040] A dust removal cylinder 33 is provided at the rear of the second processing cylinder 32 to transport straw debris mixed in with the second processing material to the rear. A dust removal fan 34 is provided above the straw rack 25D of the oscillating sorting device 25 to suck up straw debris and discharge it to the outside. A conveying spiral 33A is provided on the outer circumference of the dust removal cylinder 33 to transport straw debris to the rear.

[0041] A straw conveying device 35 is provided at the rear of the feed chain 20 to transport the threshed grain stalks backward. The front of the straw conveying device 35 is located above the rear of the feed chain 20, and the rear of the straw conveying device 35 is located above the straw processing chamber 36.

[0042] In the upper part of the straw processing chamber 36, there is a guide body 37 that changes the direction of the straw stalks being transported by the straw conveying device 35, and below the guide body 37, there are a number of shredding cutters 38 that are spaced apart in the left-right direction to shred the straw stalks that fall from the rear of the straw conveying device 35.

[0043] As shown in Figure 6, the output rotation of engine E is transmitted to the continuously variable transmission 40. The output rotation of engine E transmitted to the input shaft of the continuously variable transmission 40 undergoes acceleration / deceleration and rotational direction switching within the continuously variable transmission 40.

[0044] The output rotation of the first output shaft of the continuously variable transmission 40 is transmitted to the transmission 41. The output rotation of the first output shaft of the continuously variable transmission 40, transmitted to the input shaft of the transmission 41, is accelerated or decelerated by the multi-stage gears in the transmission 41 before being transmitted to the running gear 2. This allows the output rotation of the engine E to be accelerated or decelerated before being transmitted to the running gear 2.

[0045] The output rotation of the second output shaft of the continuously variable transmission 40 is transmitted to the harvesting device 3 via the harvesting clutch 42. This allows the output rotation of the engine E to be increased or decreased and transmitted to the harvesting device 3.

[0046] The engine E output rotation is transmitted to the threshing device 4 via the threshing clutch 43. This allows the engine E output rotation to be transmitted to the threshing device 4.

[0047] The output rotation of engine E is transmitted to the discharge auger 8 via the discharge clutch 44. This allows the output rotation of engine E to be transmitted to the discharge auger 8.

[0048] <Engine power output and rotation transmission diagram> As shown in Figure 7, the output rotation of engine E is transmitted to the counter shaft 50 via the main clutch 43A of the threshing clutch 43.

[0049] The output rotation of the counter shaft 50 is transmitted to the winnowing machine 26 via pulleys 51A and 51B to drive the winnowing machine 26. In addition, the output rotation of the counter shaft 50 is transmitted to the first grain lifting cylinder 30 and the second grain lifting cylinder 31 via pulleys 52A to 52C to drive the first grain lifting cylinder 30 and the second grain lifting cylinder 31.

[0050] The output rotation of the No. 1 grain lifting cylinder 30 is transmitted via pulleys 53A to 53D to the dust removal fan 34, the guide body 37, and the shredding cutter 38, which in turn drive the dust removal fan 34, the guide body 37, and the shredding cutter 38.

[0051] The rotational force of the dust removal fan 34 is transmitted to the rotating shaft (rear rotating shaft) 55 via the chain clutch (rear chain clutch) 54. A sprocket (rear sprocket) 55A for tensioning the rear of the feed chain 20 is provided on the left side of the rotating shaft 55. The chain clutch 54 is connected after a predetermined time has elapsed after the chain clutch 61, which will be described later, has been released. This restarts the feed chain 20 to prevent clogging of grain stalks and allows the grain stalks accumulated in the harvesting device 3 and threshing device 4 to be transported to the threshing device 4.

[0052] The output rotation of the counter shaft 50 is transmitted to the counter shaft 56 via the sub-clutch 43B of the threshing clutch 43.

[0053] The output rotation of the counter shaft 56 is transmitted to the threshing drum 21 via the bevel gear 57, causing the threshing drum 21 to rotate.

[0054] The output rotation of the threshing drum 21 is transmitted to the straw conveying device 35 via pulleys 58A and 58B, driving the straw conveying device 35.

[0055] The output rotation of the engine E transmitted to the harvesting device 3 is transmitted to the rotating shaft 60, and the output rotation of the rotating shaft 60 is transmitted to the rotating shaft (the "front rotating shaft" in the claim) 62 via the chain clutch (the "front chain clutch" in the claim) 61. A sprocket (the "front sprocket" in the claim) 62A for tensioning the front part of the feed chain 20 is provided on the left side of the rotating shaft 62.

[0056] The output rotation of engine E is transmitted to the countershaft 70 via the exhaust clutch 44.

[0057] The output rotation of the counter shaft 70 is transmitted via the clutch 71 to the cooling fan 6A in the engine room 6, causing the cooling fan 6A to rotate. The output rotation of the counter shaft 70 is also transmitted via the bevel gear 72 to the grain conveying spiral 7B located at the bottom of the grain tank 7, driving the grain conveying spiral 7B.

[0058] The output rotation of the grain conveying spiral 7B is transmitted via the bevel gear 72 to the vertical grain lifting cylinder 8A and the horizontal grain lifting cylinder 8B of the discharge auger 8, driving the vertical grain lifting cylinder 8A and the horizontal grain lifting cylinder 8B.

[0059] <Motor that operates the connection between the main clutch and sub-clutch, etc.> As shown in Figures 8 and 9, the main clutch pin 80, which operates the connection and disconnection of the main clutch 43A, and the sub-clutch pin 81, which operates the connection and disconnection of the sub-clutch 43B, are rotated by a motor 83, such as a servo motor, via a link arm 82. The rotation angle of the link arm 82 is measured by an angle sensor, such as a potentiometer. This allows the main clutch pin 80 and the sub-clutch pin 81 to be rotated with precision, enabling accurate connection and disconnection of the main clutch 43A and the sub-clutch 43B.

[0060] <Controller> As shown in Figure 10, the controller 90 is composed of a processing unit 91 consisting of a CPU and the like, a storage unit 92 consisting of ROM, RAM, a hard disk drive, flash memory and the like, a timer 93 for measuring elapsed time, and a communication unit 94 for data communication with the outside.

[0061] The input side of the controller 90 is connected via a predetermined input interface circuit to a weight sensor 7A that measures the weight of grain stored in the grain tank 7, an angle sensor 14A that measures the amount the raking pedal 14 is pressed, an angle sensor 16A that measures the operating position of the main speed lever 16, an angle sensor 18A that measures the operating position of the threshing lever 18, a hand switch 19 that switches from normal harvesting to hand threshing, and a layer thickness sensor 22A that measures the layer thickness of grain being transported on the transport rack 25A.

[0062] On the output side of the controller 90, the following are connected via a predetermined output interface circuit: a main clutch 43A located upstream of the straw conveying device 35 of the threshing device 4 and the shredding cutter 38 of the straw processing chamber 36; a sub clutch 43B located upstream of the straw conveying device 35; a chain clutch 54 located upstream of the sprocket 55A around which the rear of the feed chain 20 is wound; and a chain clutch 61 located upstream of the sprocket 55A around which the rear of the feed chain 20 is wound.

[0063] <How to operate the threshing clutch> As shown in Figure 11, in step S1, the processing unit 91 of the controller 90 determines the operating position of the threshing lever 18. If the measurement value of the angle sensor 18A indicates that the threshing lever 18 is in a neutral position or a rearward tilted position, that is, when the harvesting device 3 is stopped and the threshing device 4 is running, or when both the harvesting device 3 and the threshing device 4 are running, the process proceeds to step S2. If the measurement value of the angle sensor 18A indicates that the threshing lever 18 is in a forward tilted position, that is, when both the harvesting device 3 and the threshing device 4 are stopped, the process returns to step S1.

[0064] In step S2, the processing unit 91 determines the operating position of the main shift lever 16. If the measurement value of the angle sensor 16A indicates that the main shift lever 16 is in the neutral position or a rearward tilted position, that is, when the traveling device 2 and the harvesting device 3 are stopped or when the traveling device 2 is moving in reverse and the harvesting device 3 is being driven, the process proceeds to step S3. If the measurement value of the angle sensor 16A indicates that the main shift lever 16 is in a forward tilted position, that is, when the traveling device 2 is moving forward and the harvesting device 3 is being driven, the process returns to step S1.

[0065] In step S3, the processing unit 91 determines the thickness of the grain layer being transported on the transport rack 25A. If the measurement value of the layer thickness sensor 22A is less than the preset layer thickness, the process proceeds to step S4; if the measurement value of the layer thickness sensor 22A is equal to or greater than the preset layer thickness, the process returns to step S1. This makes it possible to suppress the discharge of grain with attached branches and stems (third loss) that is discharged to the outside by the dust removal fan 34.

[0066] In this embodiment, the processing unit 91 determines the thickness of the grain layer being transported on the transport rack 25A, but it can also determine whether or not there is grain being transported to the grain tank 7 by the first hoisting cylinder 30. If the measurement value of the weight sensor 7A does not increase within a predetermined time, the process proceeds to step S4, and if the measurement value of the weight sensor 7A increases within a predetermined time, the process returns to step S1.

[0067] In step S4, the processing unit 91 determines the state of the raking pedal 14, which is used to continue driving the threshing device 4, if there are grain stalks remaining in the harvesting device 3 or the threshing device 4. If the measurement from the angle sensor 14A determines that the operator is not pressing down on the raking pedal 14, the process proceeds to step S5. If the measurement from the angle sensor 14A determines that the operator is pressing down on the raking pedal 14, the process returns to step S1. This restricts the disengagement of the main clutch 43A and sub-clutch 43B of the threshing clutch 43, allowing the grain stalks remaining in the harvesting device 3 or the threshing device 4 to be threshed and sorted, thereby suppressing grain recovery loss.

[0068] In step S5, the processing unit 91 determines whether the system has switched from the normal harvesting mode, in which the harvesting device 3 cuts the grain stalks, to the manual harvesting mode, in which the operator manually cuts the grain stalks. If the manual harvesting switch 19 is not pressed and the system determines that the system is in the normal harvesting mode, it proceeds to step S6. If the manual harvesting switch 19 is pressed and the system determines that the system is in the manual harvesting mode, it returns to step S1. This restricts the disengagement of the main clutch 43A and sub-clutch 43B of the threshing clutch 43, allowing the grain stalks manually harvested by the operator to be threshed and sorted by the threshing device 4.

[0069] In step S6, the processing unit 91 disconnects the chain clutch 61 provided on the harvesting device 3 and connects the chain clutch 54 provided on the threshing device 4, then proceeds to step S7. This transmits the output rotation of the engine E to the sprocket 55A supported on the rotating shaft 55, which rotates the feed chain 20. The grain stalks accumulated on the feed chain 20 are then threshed and sorted by the threshing device 4, thereby suppressing grain recovery loss.

[0070] In step S7, the processing unit 91 determines whether a predetermined time has elapsed. If the timer 93's measurement indicates that the predetermined time has elapsed, the process proceeds to step S8. If the timer 93's measurement indicates that the predetermined time has not elapsed, step S7 is repeated. This allows the grain stalks remaining on the feed chain 20 to be threshed and sorted by the threshing device 4, further reducing the loss of recovered grain.

[0071] In step S8, the processing unit 91 disengages the sub-clutch 43B provided on the threshing device 4 and proceeds to step S9. This stops the straw conveying device 35 that transports the threshed straw stalks processed by the threshing device 4 to the upper part of the straw processing chamber 36, thereby increasing the safety of the working environment and preventing injury to the worker even if they accidentally come into contact with the straw conveying device 35. Furthermore, when the processing unit 91 disengages the sub-clutch 43B, it is preferable to display a monitor or flash a lamp on the monitor 12 of the control unit 5 to indicate that the threshing process in the threshing drum 21 has stopped.

[0072] In step S9, the processing unit 91 determines whether a predetermined time has elapsed. If it determines that the timer 93 has measured that the predetermined time has elapsed, the process proceeds to step S10. If it determines that the timer 93 has measured that the predetermined time has not elapsed, the process repeats step S9. This reduces sudden fluctuations in the load applied to the engine E, suppresses disturbances applied to the processing unit 91, and stabilizes the control.

[0073] In step S10, the processing unit 91 disconnects the main clutch 43A provided in the threshing device 4 and proceeds to step S11. This stops the shredding cutter 38 that shreds the straw stalks falling from the straw conveying device 35, thereby increasing the safety of the work environment and preventing injury to the worker even if they accidentally come into contact with the shredding cutter 38. Furthermore, when the processing unit 91 disconnects the main clutch 43A, it is preferable to illuminate a monitor display or lamp on the monitor 12 of the control unit 5 to indicate that the entire threshing device 4 has stopped running.

[0074] In step S11, the processing unit 91 disconnects the chain clutch 54 provided on the threshing device 4, connects the chain clutch 61 provided on the harvesting device 3, and returns to step S1. This allows the feed chain 20 to be driven in conjunction with the harvesting device 3 when the main gear lever 16 is tilted forward and the traveling device 2 moves forward, thereby resuming the harvesting operation.

[0075] In this embodiment, the processing unit 91 disconnects the sub-clutch 43B in step S8 and the main clutch 43A in step S10. However, steps S8 and S9 can be omitted, and the main clutch 43A and sub-clutch 43B can be disconnected simultaneously. [Examples]

[0076] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0077] [Example 1] The present invention will be explained using harvesting work as an example, with the combine harvester rotating counterclockwise. The operator holds the harvesting lever 18 in a rearward tilt position, and the harvesting clutch 42 and threshing clutch 43 are engaged to perform the harvesting work. At a corner of the circular path, the operator stops the travel device 2 by setting the main transmission lever 16 to the neutral position, and then moves the travel device 2 in reverse by setting the main transmission lever 16 to a rearward tilt position to perform a turning maneuver, aligning the front direction of the combine harvester with a row perpendicular to the row in which the grain stalks have been harvested. It should be noted that the combine harvester used by the operator is equipped with a function that automatically stops the harvesting device 3 by disengaging the harvesting clutch 42 when the travel device 2 is stopped or moved in reverse by setting the main transmission lever 16 to the neutral or rearward tilt position.

[0078] When the combine harvester stops at a corner of the circular path during harvesting, the harvesting device 3 also stops automatically. However, the feed chain 20, which is driven in conjunction with the harvesting device 3, also stops. To prevent harvested grain stalks from remaining on the feed chain 20, the controller 90 disconnects the front chain clutch 61 and engages the rear chain clutch 54, controlling the feed chain 20 to be driven in conjunction with the threshing device 4. At this time, the threshing and sorting process continues, and the straw conveying device 35 and the shredding cutter 38, which are driven in conjunction with the threshing device 4, are also running. This poses a risk of injury to workers or non-workers who accidentally come into contact with the shredding cutter 38. Furthermore, if the oscillating sorting device 25 continues to run, a third loss will occur. Therefore, the timing of stopping the threshing device 4 is adjusted to suppress grain recovery loss. For example, the controller 90 may stop the threshing device 4 after a predetermined time has elapsed (for example, 3 to 5 seconds) from when the traveling device 2 stops moving forward or moves backward. Furthermore, if the measured value of the layer thickness sensor 22A is indicated in one of four stages: "thick," "medium," "thin," or "none," the layer thickness sensor 22A may detect "thin" or "none" and stop the threshing device 4. Alternatively, the threshing device 4 may be stopped after a predetermined time has elapsed (for example, 0 to 7 seconds, preferably 3 to 5 seconds) after the layer thickness sensor 22A detects "thin" or "none." After the threshing device 4 is stopped, the controller 90 releases the rear chain clutch 54 and connects the front chain clutch 61 so that the drive of the feed chain 20 is linked to the drive of the harvesting device 3.

[0079] When the operator sets the main gear lever 16 to a forward tilt position and moves the travel device 2 forward to resume harvesting, the controller 90 connects the harvesting clutch 42 of the harvesting device 3 and the threshing clutch 43 of the threshing device 4 to resume harvesting and threshing operations.

[0080] The present invention may also be equipped with a human body detection switch. When the operator tilts the harvesting lever 18 to the rearward position, keeping the harvesting clutch 42 and threshing clutch 43 engaged, and stops the travel device 2 by moving the main transmission lever 16 to the neutral position, the controller 90 is configured to detect the OFF state of the human body detection switch (no person present) and release the connection between the harvesting clutch 42 and threshing clutch 43. The human body detection switch is preferably a seat switch that is activated by the weight of the operator sitting on the seat. This configuration stops the operation of the straw conveying device 35 and the shredding cutter 38, which are driven in conjunction with the threshing device 4, thereby preventing injuries caused by accidental contact between the operator and non-operators with the shredding cutter 38. [Explanation of Symbols]

[0081] 1. Aircraft frame 2. Traveling device 3 Reaping device 4. Threshing machine 5. Control Unit 7 Glen Tank 7A Weight Sensor 14. Scooping pedal 16. Main gear shift lever (gear shift lever) 18. Cutting lever 19. Manual switch 20 Feed Chain 21. 22A Layer Thickness Sensor 25. Oscillating sorting device 25A transfer shelf 35. Straw Removal and Conveying Device 38 Shredder 40 Continuously Variable Transmission 42 Harvesting clutch 43 Threshing clutch 43A Main Clutch 43B Subclutch 54 Chain clutch (rear chain clutch) 55 Rotation axis (rear rotation axis) 55A Sprocket (Rear Sprocket) 61 Chain clutch (front chain clutch) 62 Rotation axis (front rotation axis) 62A Sprocket (Front Sprocket) 90 Controllers E-engine

Claims

1. A combine harvester having a machine frame (1) on which an engine (E) is mounted, a traveling device (2) for traveling in a field located below the machine frame (1), a harvesting device (3) for cutting grain stalks located at the front of the machine frame (1), a threshing device (4) for threshing and sorting the grain stalks located at the left rear of the harvesting device (3), a control unit (5) for the operator to sit in located at the right rear of the harvesting device (3), and a grain tank (7) for storing threshed and sorted grain located at the rear of the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the traction unit (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation. A threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path. A harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path. At the rear of the threshing device (4), a straw conveying device (35) is provided for conveying the threshed and sorted straw stalks to the rear, and below the straw conveying device (35), a shredding cutter (38) is provided for shredding the straw stalks that fall from the straw conveying device (35). The control unit (5) is provided with a gear shift lever (16) for operating the continuously variable transmission (40), and a threshing lever (18) for operating the threshing clutch (43) and the harvesting clutch (42). The threshing clutch (43) is formed by a main clutch (43A) located between the engine (E) and the transmission path of the straw conveying device (35), and a sub-clutch (43B) located between the main clutch (43A) and the transmission path of the shredding cutter (38). The controller (90) of the combine harvester is characterized in that, when the threshing lever (18) is operated to engage the threshing clutch (43) and the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), the controller (90) of the combine harvester disengages the sub-clutch (43B), and then disengages the main clutch (43A) after a predetermined time has elapsed.

2. A combine harvester having a machine frame (1) on which an engine (E) is mounted, a traveling device (2) for traveling in a field provided on the lower side of the machine frame (1), a harvesting device (3) for cutting grain stalks provided on the front side of the machine frame (1), a threshing device (4) for threshing and sorting grain stalks provided on the left rear side of the harvesting device (3), a control unit (5) for the operator to sit on on the right rear side of the harvesting device (3), and a grain tank (7) for storing threshed and sorted grain provided on the rear side of the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the traction unit (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation. A threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path. A harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path. At the rear of the threshing device (4), a straw conveying device (35) is provided for conveying the threshed and sorted straw stalks to the rear, and below the straw conveying device (35), a shredding cutter (38) is provided for shredding the straw stalks that fall from the straw conveying device (35). The control unit (5) is provided with a gear shift lever (16) for operating the continuously variable transmission (40), and a threshing lever (18) for operating the threshing clutch (43) and the harvesting clutch (42). A layer thickness sensor (22A) is provided to measure the layer thickness of the grain being transported on the transfer shelf (25A) of the oscillating sorting device (25) located below the threshing drum (21) of the threshing device (4). The controller (90) of the combine harvester is characterized in that when the threshing lever (18) is operated to engage the threshing clutch (43), the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), and the measured value of the layer thickness sensor (22A) is thinner than a predetermined layer thickness, the controller (90) of the combine harvester disengages the threshing clutch (43).

3. A combine harvester having a machine frame (1) on which an engine (E) is mounted, a traveling device (2) for traveling in a field located below the machine frame (1), a harvesting device (3) for cutting grain stalks located at the front of the machine frame (1), a threshing device (4) for threshing and sorting the grain stalks located at the left rear of the harvesting device (3), a control unit (5) for the operator to sit in located at the right rear of the harvesting device (3), and a grain tank (7) for storing threshed and sorted grain located at the rear of the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the traction unit (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation. A threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path. A harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path. At the rear of the threshing device (4), a straw conveying device (35) is provided for conveying the threshed and sorted straw stalks to the rear, and below the straw conveying device (35), a shredding cutter (38) is provided for shredding the straw stalks that fall from the straw conveying device (35). The control unit (5) is provided with a gear shift lever (16) for operating the continuously variable transmission (40), and a threshing lever (18) for operating the threshing clutch (43) and the harvesting clutch (42). A weight sensor (7A) is provided in the grain tank (7) to measure the weight of the grain stored therein. The controller (90) of the combine harvester is characterized in that when the threshing lever (18) is operated to engage the threshing clutch (43), the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), and the measured value of the weight sensor (7A) does not increase for a predetermined period of time, the controller (90) of the combine harvester disengages the threshing clutch (43).

4. A combine harvester having a machine frame (1) on which an engine (E) is mounted, a traveling device (2) for traveling in a field located below the machine frame (1), a harvesting device (3) for cutting grain stalks located at the front of the machine frame (1), a threshing device (4) for threshing and sorting the grain stalks located at the left rear of the harvesting device (3), a control unit (5) for the operator to sit in located at the right rear of the harvesting device (3), and a grain tank (7) for storing threshed and sorted grain located at the rear of the control unit (5), A continuously variable transmission (40) is provided between the engine (E) and the traction unit (2) in the transmission path, which increases or decreases the output rotation of the engine (E) and switches the direction of rotation. A threshing clutch (43) is provided between the engine (E) and the threshing device (4) in the transmission path. A harvesting clutch (42) is provided between the continuously variable transmission (40) and the harvesting device (3) in the transmission path. At the rear of the threshing device (4), a straw conveying device (35) is provided for conveying the threshed and sorted straw stalks to the rear, and below the straw conveying device (35), a shredding cutter (38) is provided for shredding the straw stalks that fall from the straw conveying device (35). The control unit (5) is provided with a gear shift lever (16) for operating the continuously variable transmission (40), and a threshing lever (18) for operating the threshing clutch (43) and the harvesting clutch (42). A feed chain (20) is provided to transport the grain stalks harvested by the harvesting device (3) to the threshing device (4). The controller (90) of the combine harvester is characterized in that, when the cutting lever (18) is operated to engage the cutting clutch (42) and the threshing clutch (43), and the gear shift lever (16) is operated to stop or reverse the output rotation of the continuously variable transmission (40), it releases the connection of the cutting clutch (42), releases the connection of the front chain clutch (61) located between the engine (E) and the transmission path of the front rotating shaft (62) that supports the front sprocket (62A) that tensions the front part of the feed chain (20), connects the rear chain clutch (54) located between the engine (E) and the transmission path of the rear rotating shaft (55) that supports the rear sprocket (55A) that tensions the rear part of the feed chain (20), and releases the connection of the threshing clutch (43) after a predetermined time has elapsed.

5. The control unit (5) is provided with a manual switch (19) that switches from the operation mode in which the harvesting device (3) harvests the grain stalks to a manual operation mode in which the operator manually harvests the grain stalks. The combine harvester according to claim 4, wherein the controller (90) restricts the disengagement of the threshing clutch (43) when the manual operation switch (19) is pressed and the system is switched to manual operation mode.

6. The control unit (5) is provided with a scraping pedal (14) that switches to a scraping mode in which the grain stalks accumulated in the harvesting device (3) and threshing device (4) are threshed and sorted by the threshing device (4). The combine harvester according to claim 4, wherein the controller (90) restricts the disengagement of the threshing clutch (43) when the raking pedal (14) is pressed down and the harvesting mode is activated.

Images