Combine harvester

Abstract

A combine harvester is provided. The combine harvester does not incur a complicated configuration, and can eliminate clogging of a spike in a conveying device by a simple configuration that enables a conveying section to act in a reverse direction. The combine harvester includes a cutting section that cuts a spike, and a conveying section that conveys the spike cut by the cutting section toward a threshing section. The conveying section includes a conveying mechanism that conveys the cut spike toward the threshing section by rotation in one direction, a rotation restriction section that restricts the rotation of the conveying mechanism in the one direction to make the conveying mechanism into a restricted state, and a restraining section (500) that restrains the conveying mechanism into the restricted state until a prescribed condition is established. The conveying mechanism is configured to be able to rotate in a direction opposite to the one direction in the restricted state based on the rotation restriction section.

Description

Technical Field

[0001] The present invention relates to a combine harvester having a conveying section for conveying stalks cut by a cutting section toward a threshing section. Background Technology

[0002] Conventional combine harvesters include a feeding section that serves as a conveying unit for transporting stalks cut by the cutting section towards the threshing section. The feeding section comprises a structure in which a conveyor for conveying stalks is housed within a feeding chamber that forms the outer casing. The conveyor has a cutting input shaft with a left-right axial direction as its drive shaft, which provides shaft support to the conveying terminal side of the conveyor.

[0003] The rear end of the feeding section uses the cutting input shaft as a rotating shaft and is supported rotatably on the side of the combine harvester's traveling body. The feeding section, together with the cutting device or harrowing reel located at its front, constitutes the cutting section, which is configured to lift and lower by rotating the feeding section relative to the traveling body.

[0004] In a combine harvester with such a structure, there is a mechanism for reversing the conveyor to clear the blockage of the ear stalks in the feeding section (for example, see Patent Documents 1 and 2).

[0005] Patent Document 1 discloses a structure in which reverse power obtained from a threshing drum drive is transmitted via a reverse clutch to a cutting input shaft, which serves as the input shaft of a conveyor for a feeding section. This threshing drum drive is used to transmit engine power toward the threshing drum. In this structure, in cases of stalk blockage in the feeding section, the feeding section is reverse-driven by engaging the reverse clutch.

[0006] Furthermore, Patent Document 2 discloses a structure in which a reversing mechanism is provided between a threshing cylinder input shaft that receives power from the engine to rotate the threshing cylinder of the threshing section and a cutting input shaft. This reversing mechanism reverses the rotation transmitted toward the cutting input shaft, which serves as the conveyor input shaft for the feeding section. The reversing mechanism includes an input / output clutch for reversing the power transmitted toward the cutting input shaft. The reversing mechanism of Patent Document 2 comprises components such as pulleys, belts, and gears that transmit the power used to reverse the cutting input shaft, and shafts that support them.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2014-14333

[0010] Patent Document 2: Japanese Patent Application Publication No. 2016-136924 Summary of the Invention

[0011] The aforementioned existing technologies all have the following structure: a reversing transmission mechanism for reversing the conveyor is provided within the path that transmits power from the engine to the cutting section. Therefore, the power transmission mechanism for transmitting power from the engine to the cutting section becomes complex in construction, has a large number of parts, and is costly. Furthermore, as in the structure of Patent Document 2, the reversing power transmission mechanism is designed to branch off from the forward power transmission path of the cutting input shaft, requiring a structure to prevent interference between the forward and reverse power transmissions. Therefore, there are problems such as increased construction complexity or larger device structure.

[0012] In view of this fact, the main objective of the present invention is to provide a combine harvester that does not complicate the structure and allows the conveying section to operate in the reverse direction with a simple structure, thereby eliminating the blockage of the stalks in the conveying device.

[0013] The first feature of the present invention comprises: a cutting section for cutting ear stalks; and a conveying section for conveying the ear stalks cut by the cutting section toward a threshing section, the conveying section comprising: a conveying mechanism for conveying the cut ear stalks toward the threshing section by rotating in one direction; a rotation limiting section for limiting the rotation of the conveying mechanism in the one direction, thereby placing the conveying mechanism in a limited state; and a restraining section for restraining the conveying mechanism in the limited state until a predetermined condition is met, wherein the conveying mechanism is configured such that, in the limited state imposed by the rotation limiting section, the conveying mechanism rotates in a direction opposite to the one direction as the conveying section moves up and down.

[0014] According to this structure, the conveying mechanism is limited only by a rotation limiting part, thereby allowing it to rotate in the opposite direction. Therefore, it avoids complicating the construction, and the conveying mechanism can rotate in the opposite direction with a simple structure. This eliminates the blockage of stalks in the conveying device.

[0015] When the conveying mechanism is in a restricted state, a rotation limiting part is used to restrict the rotation of the conveying mechanism in one direction. At this time, when the rotation of the conveying mechanism in one direction continues to remain unchanged, the rotation limiting part is used to forcibly restrict the rotation in one direction, and a large force is applied to the rotation limiting part or the conveying mechanism, which may easily cause damage to the rotation limiting part or the conveying mechanism.

[0016] Therefore, according to this structure, a restraining part is provided that restrains the conveying mechanism into a restricted state until a predetermined condition is met. Thus, until the predetermined condition is met, it is unnecessary to use a rotation limiting part to restrict the rotation of the conveying mechanism in one direction; instead, the restraining part alone can suppress the application of excessive force to the rotation limiting part or the conveying mechanism. At this time, the predetermined condition is set such that the rotation of the conveying mechanism in one direction is stopped upon its fulfillment. After the rotation of the conveying mechanism in one direction stops, the rotation limiting part can be used to restrict the rotation of the conveying mechanism in one direction, thereby effectively preventing damage to the rotation limiting part or the conveying mechanism.

[0017] The second structural feature of the present invention comprises: a machine body having the cutting section, the conveying section, and the threshing section; and a machine body movement limiting section, which restricts the movement of the machine body by being activated by an operation of stepping on the machine body movement limiting operation section.

[0018] The specified conditions include: the movement restriction unit of the machine body is in a working state.

[0019] According to this structure, the movement of the machine body is restricted by the movement restriction unit being in an active state. When a predetermined condition is met, the rotation restriction unit can be used to restrict the rotation of the conveying mechanism in one direction, thus restricting the conveying mechanism to a restricted state. This ensures that the rotation of the conveying mechanism in one direction stops for a sufficient amount of time, thereby preventing damage to the rotation restriction unit or the conveying mechanism. Furthermore, while the movement of the machine body is restricted by the movement restriction unit, rotating the conveying mechanism in the opposite direction allows for the removal of stalk blockages in the conveying device, effectively eliminating such blockages.

[0020] The third structural feature of the present invention is that the body movement limiting part is configured such that, when the conveying mechanism is in a restricted state by means of the rotation limiting part, the body movement limiting part cannot switch from an operating state to a non-operating state.

[0021] According to this structure, when the conveying mechanism is restricted by the rotation limiting part, the movement limiting part of the machine body cannot be switched from the working state to the non-working state. Therefore, when the conveying mechanism is rotating in the opposite direction, the state that causes the machine body to move can be avoided, and the machine body can be prevented from moving unintentionally by the operator. Furthermore, the operation of clearing the blockage of the ear stalks in the conveying device can be performed, thereby effectively clearing the blockage of the ear stalks.

[0022] The fourth structural feature of the present invention comprises: a working operation member for operating the cutting section and the conveying section; and operating positions of the working operation member including: a working operation position, in which the cutting section is in a working state and the conveying mechanism is driven to rotate in the stated direction; a stop operation position, in which the cutting section is in a non-working state and the rotational drive of the conveying mechanism in the stated direction is stopped; and a reverse operation position, in which the cutting section is in a non-working state and the conveying mechanism is restricted by the rotation limiting member, thereby enabling the conveying mechanism to rotate in the opposite direction to the stated direction.

[0023] The restraining part is configured to restrain the movement of the operating component toward the reverse operation position until the specified conditions are met, thereby restraining the conveying mechanism into a restricted state.

[0024] According to this structure, a working operation member is used to operate the cutting section and the conveying section. By operating the working operation member toward the reverse operating position, the conveying mechanism can be restricted by the rotation limiting member, thereby causing the conveying mechanism to rotate in the opposite direction. This simplifies the structure and improves the operability of rotating the conveying mechanism in the opposite direction. Furthermore, the restraining member restrains the movement of the working operation member toward the reverse operating position, thus restricting the conveying mechanism to the restricted state. Therefore, the structure is simplified, and the restraining member can be appropriately restrained. Incidentally, the working operation member can be a working operation member that operates the switching on and off of power to the cutting section and the conveying section.

[0025] Preferably, the present invention comprises: a machine body having the cutting section, the conveying section, and the threshing section; a machine body movement limiting section that, by being in an operating state, restricts the movement of the machine body; and a machine body movement limiting operation section that operates the machine body movement limiting section.

[0026] The operating positions of the machine body movement restriction operation unit include: a non-operating position that puts the machine body movement restriction unit into a non-operating state; and an operating position that puts the machine body movement restriction unit into an operating state.

[0027] The restraining part can move in conjunction with the movement of the body movement restriction operation part. When the body movement restriction operation part is in a non-working position, the restraining part is switched to a restraining state to restrain the conveying mechanism into a restricted state. As the body movement restriction operation part moves toward the working position, the predetermined condition is met, and the restraining part is switched to a restraining release state to release the restraining state.

[0028] According to this structure, the restraining unit can move in conjunction with the movement of the body movement restriction operating unit. Therefore, the movement of the body movement restriction operating unit can be effectively utilized, the structure can be simplified, and the restraining state and restraint release state can be appropriately switched. Furthermore, when the body movement restriction operating unit is in a non-working position and the body movement restriction unit is in a non-working state, the restraining unit can be appropriately switched to the restraining state. And, as the body movement restriction operating unit moves towards the working position, and a predetermined condition is met, when the body movement restriction unit becomes working, the restraining unit can be appropriately switched to the restraint release state. Accordingly, by appropriately linking the movement of the body movement restriction unit with the movement of the restraining unit, and ensuring that the predetermined condition is met only after sufficient time is provided to stop the rotation of the conveying mechanism in one direction, damage to the rotation restriction unit or the conveying mechanism can be effectively prevented.

[0029] Preferably, the present invention includes a linkage mechanism for a rotation limiting part, which is capable of operating the rotation limiting part in conjunction with the movement of the working member toward a reverse operating position, thereby using the rotation limiting part to put the conveying mechanism into a restricted state.

[0030] The restraining part is configured to restrain the operation of the rotation limiting part linkage mechanism until the predetermined condition is met, thereby restraining the conveying mechanism into a restricted state.

[0031] When the operating component is in the reverse operation position and the conveying mechanism is in a restricted state, the rotation restriction part uses a linkage mechanism to restrict the movement of the restraining part, thereby preventing the body movement restriction part from switching from the working state to the non-working state.

[0032] According to this structure, by incorporating a linkage mechanism for a rotation limiting part, the movement of the operating component can be utilized, simplifying the structure and enabling the conveying mechanism to be in a restricted state using the rotation limiting part. Furthermore, the restraining part restrains the conveying mechanism to be in a restricted state by restraining the movement of the rotation limiting part linkage mechanism. Therefore, using a rotation limiting part linkage mechanism that restrains the conveying mechanism by utilizing the rotation limiting part allows for appropriate restraint of the conveying mechanism to be in a restricted state. In addition, by restricting the movement of the restraining part, the rotation limiting part linkage mechanism prevents the machine body movement limiting part from switching from an operating state to a non-operating state. Therefore, the rotation limiting part linkage mechanism can possess the following three functions: the function of restraining the conveying mechanism using the rotation limiting part, the function of switching the restraining part to a restraining state, and the function of preventing the machine body movement limiting part from switching to a non-operating state. This effectively simplifies the structure and allows each function to be appropriately utilized.

[0033] The fifth structural feature of the present invention is that the combine harvester includes a body movement limiting unit that restricts the movement of the body by entering an operating state when the body movement limiting unit is stepped on, and also includes a second operating line that, when the body movement limiting unit is in the operating state and the working operation member is allowed to move toward the reverse operation position, even if the working operation member is moved from the working operation position to the reverse operation position, the second operating line can still restrain the conveying mechanism into a limiting state.

[0034] The sixth feature of the present invention is that when the second operating line is in the working state, the conveying mechanism is restrained to a restricted state; when the second operating line is in the non-working state, the conveying mechanism is allowed to be in a restricted state; and when the conveying mechanism is in a restricted state, even without changing the second operating line from the non-working state to the working state, the restricted state of the conveying mechanism can be released by moving the work operation member from the reverse operation position toward the work operation position or the stop operation position. Attached Figure Description

[0035] Figure 1 This is a left view of a combine harvester according to one embodiment of the present invention.

[0036] Figure 2 This is a right view of a combine harvester according to one embodiment of the present invention.

[0037] Figure 3 This is a top view of a combine harvester according to one embodiment of the present invention.

[0038] Figure 4This is a diagram illustrating the power transmission structure in a combine harvester according to one embodiment of the present invention.

[0039] Figure 5 This is a left view showing the feeding section and the surrounding structure according to an embodiment of the present invention.

[0040] Figure 6 This is a left view showing the structure of the feeding section according to an embodiment of the present invention.

[0041] Figure 7 This is a top view showing the rear of the feeding section according to one embodiment of the present invention.

[0042] Figure 8 This is a perspective view showing the rear part of the feeding section according to an embodiment of the present invention.

[0043] Figure 9 This is a perspective view showing the structure of the reversing mechanism according to one embodiment of the present invention.

[0044] Figure 10 This is a left view showing the reversing mechanism according to one embodiment of the present invention.

[0045] Figure 11 This is a top view showing the reversing mechanism and amplification mechanism according to an embodiment of the present invention.

[0046] Figure 12 This is a rear sectional view showing the reversing mechanism and amplification mechanism according to an embodiment of the present invention.

[0047] Figure 13 This is a schematic diagram illustrating the reversing mechanism and the amplification mechanism according to one embodiment of the present invention.

[0048] Figure 14 This is a diagram illustrating the structure of a working clutch lever according to one embodiment of the present invention.

[0049] Figure 15 This is an explanatory diagram of the operating mode of the working clutch lever according to one embodiment of the present invention.

[0050] Figure 16 This is a perspective view showing the working clutch lever and linkage mechanism according to an embodiment of the present invention.

[0051] Figure 17 This is a top view showing the working clutch lever and linkage mechanism according to an embodiment of the present invention.

[0052] Figure 18This is a side view showing the working clutch lever, linkage mechanism, and restraint part according to an embodiment of the present invention.

[0053] Figure 19 This is a side view showing the working clutch lever, linkage mechanism, and restraint part according to an embodiment of the present invention.

[0054] Figure 20 This is a side view showing the working clutch lever, linkage mechanism, and restraint part according to an embodiment of the present invention.

[0055] Figure 21 This is a control block diagram according to one embodiment of the present invention.

[0056] Figure 22 This is an operational illustration of the working clutch lever and linkage mechanism according to one embodiment of the present invention.

[0057] Figure 23 This is an operational illustration of the reversing mechanism according to one embodiment of the present invention.

[0058] Figure 24 This is a perspective view showing the structure of the reversing mechanism according to one embodiment of the present invention.

[0059] Figure 25 This is a perspective view showing the second operating line and the electric motor according to an embodiment of the present invention.

[0060] Figure 26 This is a perspective view showing the second operating line and the electric motor according to an embodiment of the present invention. Detailed Implementation

[0061] The present invention is configured such that a conveying device for transporting stalks cut by the cutting section and supplying them toward the threshing section is configured to rotate and lift about the cutting input shaft. By utilizing the lifting action of the conveying device, the conveyor of the conveying device moves in the opposite direction, thereby eliminating stalk blockage in the conveying device with a simple structure. Embodiments of the present invention will be described below.

[0062] [First Embodiment]

[0063] [Overall structure of a combine harvester]

[0064] First, use Figures 1-4 The overall structure of the combine harvester 1 according to this embodiment will be described. Furthermore, in the following description, the left side when facing the front of the combine harvester 1 (…) Figure 3 (lower side) and right side ( Figure 3The upper side of the machine is designated as the left and right sides of the combine harvester 1.

[0065] like Figure 1 as well as Figure 2 As shown, the combine harvester 1 according to this embodiment is a general-type combine harvester that can harrow the harvested crops from the field into the machine body, perform threshing / screening / grain storage, and appropriately output them out of the machine. The combine harvester 1 has: a self-moving traveling body 2 (equivalent to the machine body), and a cutting section 3 provided at the front end of the traveling body 2. The cutting section 3 is configured as a cutting device that cuts rice or wheat or other grains without harvesting the stalks while picking them up, and is mounted on the traveling body 2 in a manner that allows it to be raised and lowered relative to the traveling body 2.

[0066] The traveling body 2 includes a traveling section 4, which is configured as a tracked traveling device with a pair of left and right track sections 5, 5. A body frame 6 is erected between the left and right track sections 5, 5. Each track section 5 has multiple rotating bodies, including a drive sprocket 5a provided at the front end of the track section 5 and a tension roller 5b provided at the rear end of the track section 5; and a track 5c wound around these rotating bodies. The multiple rotating bodies constituting the track section 5 are provided on a track frame 5d provided on the lower surface side of the traveling body 2. In addition, the drive sprocket 5a receives power transmission from the engine 25 of the combine harvester 1 and is driven to rotate.

[0067] like Figures 1-3 As shown, on the left side of the machine frame 6, there are: a threshing section 7 for threshing the ears of grain cut by the cutting section 3 and supplied thereon, and a screening section 8 for screening the grains threshed by the threshing section 7. The threshing section 7 and the screening section 8 are arranged such that the threshing section 7 is on top and the screening section 8 is on the bottom.

[0068] like Figure 2 as well as Figure 3 As shown, a grain storage section 9 is provided on the frame 6 of the machine body, to the right of the threshing section 7 and the screening section 8. This grain storage section 9 includes a grain bin 10 for storing the grains (cleaned grains) screened by the screening section 8. Inside the grain bin 10 is a lower discharge conveyor 11 (see reference 11) that conveys the stored grains towards the discharge port of the grain bin 10. Figure 4A longitudinal conveyor 12 is erected vertically, communicating with the discharge port of the grain bin 10. A grain discharge conveyor 13 is connected to the upper end of the longitudinal conveyor 12. The grain discharge conveyor 13 is configured to rotate horizontally and swing up and down about a horizontal axis. The grains in the grain bin 10 are transported by these conveyors and discharged from the grain feed inlet 14 at the tip of the grain discharge conveyor 13 toward a truck cargo box or container, etc.

[0069] In addition, such as Figures 1-3 As shown, a driver's compartment 15 for the operator is located on the front right side of the machine frame 6, in front of the grain storage section 9. The driver's compartment 15 is covered by the driver's cab 16. The driver's compartment 15 includes: a driver's seat 17, a steering wheel 18 located in front of the driver's seat 17, a main gear lever 21, a secondary gear lever 22, and a working clutch lever 23. The working clutch lever 23 is used to engage the threshing clutch 57 and the cutting clutch 75 (see reference). Figure 4 The operating components for connecting and disconnecting the gear shift lever 21, the auxiliary gear shift lever 22, and the operating clutch lever 23 are located on the lever column 24 on the left side of the driver's seat 17.

[0070] like Figure 2 as well as Figure 3 As shown, an engine 25, serving as a drive source, is located behind the grain storage section 9 on the vehicle body 2. The engine 25 is a diesel engine, and a diesel particulate filter (DPF) 26 (see reference) is mounted on the engine 25 as particulate matter for exhaust gas purification. Figure 1 The DPF26 captures particulate matter, primarily black smoke, from the exhaust gas emitted by the engine 25. The engine 25 purifies its exhaust gas by passing it through the DPF26.

[0071] The cutting section 3 will be explained. For example... Figures 1-3 As shown, the harvesting section 3 includes: a feeding section 30 as a conveying device, a grain harvesting platform 31, a cutting device 32, a pair of left and right dividing sections 33, 33, and a harrowing and pulling reel 34.

[0072] The feeding unit 30 is a conveying device that transports the stalks cut by the cutting unit 3 toward the threshing unit 7. The feeding unit 30 includes a feeding chamber 35 as a housing, and a conveyor 36 (see reference) for conveying the stalks within the feeding chamber 35. Figure 5The feeding section 30 is located to the left of the driver's cab 16 and is configured such that the rear end opening of the feeding chamber 35 is connected to the threshing port 7a on the front side of the threshing section 7. The feeding chamber 35 is configured to be approximately a square tube with its long side as the front-to-back direction when viewed from above.

[0073] like Figures 1-3 As shown, the grain harvesting platform 31 is configured as a horizontally elongated bucket and is connected to the front side of the feeding section 30 via a connection to the front opening of the feeding chamber 35. A harrowing auger (platform auger) 37 is installed inside the grain harvesting platform 31. The harrowing auger 37 is mounted in a manner that allows it to rotate with the left-right direction as its rotation axis.

[0074] The cutting device 32 is located at the lower front edge of the grain harvesting platform 31 and is configured as a pusher. A pair of left and right tillage bodies 33, 33 are configured to protrude forward from the left and right sides of the front of the grain harvesting platform 31. The harrowing reel 34 is a reel with serrated beams and is located above and in front of the harrowing auger 37. The harrowing reel 34 is supported between the tips of a pair of left and right reel support arms 34a, 34a, which are pivotally supported on the grain harvesting platform 31, allowing rotation in the left-right direction. While rotating, the harrowing reel 34 continuously acts on the pods of the ear of grain, thereby harrowing the pods towards the harrowing auger 37. The operation of each part of the harvesting unit 3 utilizes power from the engine 25 transmitted via various transmission mechanisms.

[0075] like Figure 1 As shown, the conveyor 36 inside the feeding chamber 35 (refer to) Figure 5 The threshing unit 30 has a cutting input shaft (feed chamber conveyor shaft) 38, which serves as a drive shaft supporting the conveying end side of the conveyor 36. This cutting input shaft (feed chamber conveyor shaft) 38 is located at the front of the threshing section 7 and has its axial direction as left-right. The rear end of the feeding section 30 is supported by the cutting input shaft 38 and is capable of rotating in the left-right direction. Furthermore, a lifting cylinder 39 is installed between the lower surface of the feeding chamber 35 and the machine frame 6.

[0076] like Figure 1 as well as Figure 2 As shown, the lifting cylinder 39 is a single-acting hydraulic cylinder that is accompanied by hydraulic pressure when it extends. Therefore, as the lifting cylinder 39 extends under the action of hydraulic pressure, the cutting section 3 (feeding section 30) rotates in the upward direction, and when the hydraulic pressure of the lifting cylinder 39 is released, the cutting section 3 (feeding section 30) descends due to its own weight, and the lifting cylinder 39 shortens accordingly.

[0077] With this structure, the harvesting section 3 is configured to rise and fall by means of the extension and retraction of the lifting cylinder 39, with the harvesting input shaft 38 as the rotation axis. That is, the rear end of the feeding section 30 is supported on the side of the traveling body 2 of the combine harvester 1 so as to be able to rotate with the harvesting input shaft 38 as the rotation axis. Furthermore, the feeding section 30, together with the cutter device 32 and the harrowing reel 34 located at its front, constitutes the harvesting section 3. The harvesting section 3 is configured such that the feeding section 30 rotates relative to the traveling body 2 by means of the extension and retraction of the lifting cylinder 39, thereby performing a lifting and falling action. The lifting and falling action of the feeding section 30 is operated by a predetermined operating section provided in the driving section 15.

[0078] The threshing section 7 and the screening section 8 will be explained. For example... Figure 1 As shown, the threshing section 7 includes: a threshing cylinder 41 disposed in a threshing chamber with the threshing port 7a facing forward; and a receiving screen 42 disposed below the threshing cylinder 41. The threshing cylinder 41 is supported by a threshing cylinder shaft 41a with the rear-to-rear direction as the axial direction, allowing it to rotate. The threshing cylinder 41 includes: a threshing cylinder shaft 41a (see reference 41a)... Figure 4 The cylindrical main body, running along the central axis, has spiral blades arranged on its outer circumferential surface. Multiple dust valves (not shown) are provided on the upper side of the threshing cylinder 41, adjustable in angle, to regulate the conveying speed (retention time) of the threshed material within the threshing chamber. A receiving mesh 42, designed to allow the grains to leak downwards, is positioned along the lower outer circumferential surface of the threshing cylinder 41.

[0079] The screening unit 8 includes: a swing screening disc 43 as a swinging part (see reference). Figure 4 The receiving mesh 42 is positioned below the receiving mesh 42; the swing mechanism 44 includes a swing shaft 44a (see reference) that uses rotational power from a drive source to swing the swing screening disc 43. Figure 4 ); first-class product conveyor 45; second-class product conveyor 46; and winnowing machine 47. In addition, such as Figure 4 As shown, a front fan 71 is provided in front of the winnowing machine 47, and a second fan 72 is provided behind the winnowing machine 47.

[0080] Swinging sieve disc 43 (reference) Figure 4 It features a gravity screening structure including a feeding tray, a coarse screen positioned behind the feeding tray to measure the amount of grain passing through, and a grain sieve positioned below the coarse screen. First-grade product conveyor 45 (refer to...) Figure 4 The first-grade grains are collected in a first-grade guide trough extending along the width of the machine body. Second-grade conveyor 46 (refer to...) Figure 4At the rear of the first-grade conveyor 45, second-grade grains are collected in a second-grade guide trough extending along the width of the machine body. The winnowing machine 47 blows screening air through the oscillating screening disc 43 from the lower front to the upper rear.

[0081] Additionally, a reduction conveyor 48 is provided on the left side of the machine body where the threshing section 7 and the screening section 8 are located. The reduction conveyor 48 is connected to the second-grade product conveyor 46 with its lower end located near the second-grade product conveyor 46, and its upper end located near the front end of the threshing cylinder 41, thus extending in an inclined manner with a higher front and lower rear. Furthermore, an upper conveyor 49 (see reference) is provided at the upper end of the reduction conveyor 48, extending in the left-right direction in front of the threshing cylinder 41. Figure 4 ).

[0082] The combine harvester 1, equipped with the above-described structure, moves in the field by raising and lowering the feed unit 30 around the cutting input shaft 38 (support shaft), raising the cutting unit 3 to the desired height relative to the ground (the height of the ear stalk of the harvested crop), thus changing from a non-operating state to an operating state, and in this state, it travels using the traveling body 2. In this way, the combine harvester 1 uses the left and right tillers 33 to divide the harvested crop into harvestable and non-harvestable parts, and while using the harrowing reel 34 to harrow the pods on the ear tip side of the ear stalk of the harvestable part, it uses the cutting device 32 to cut the pods of the ear stalk.

[0083] The pods of the ear of grain cut at the desired cutting position are raked into the grain harvesting table 31 by a rotating auger 37, and are collected near the entrance of the feed chamber 35 in the left and right center of the grain harvesting table 31. The pods of the ear of grain are then fed into the threshing port 7a by the conveyor 36 in the feed chamber 35 and fed towards the threshing section 7.

[0084] The pods of the ear stalks supplied to the threshing section 7 are threshed using the threshing section 7. Specifically, the ear stalks supplied to the threshing section 7 are conveyed rearward by the rotating threshing cylinder 41 and are threshed mainly between the threshing cylinder 41 and the receiving net 42. Threshing materials such as grains smaller than the mesh of the receiving net 42 will leak downward from the receiving net 42. Straw fragments and the like that do not leak downward from the receiving net 42 are discharged into the field through the dust discharge port located at the rear of the screening section 8 by the conveying action of the threshing cylinder 41.

[0085] On the other hand, the grains threshed using the threshing section 7 and leaking downwards from the receiving screen 42 are screened using the screening section 8. Specifically, the threshed material threshed using the threshing cylinder 41 and leaking downwards from the receiving screen 42 is screened by the gravity screening action of the oscillating screening disc 43 and the wind screening action of the winnowing machine 47, and the fine grains (first grade), the mixture of grains with branches and stalks and straw (second grade), and straw scraps are removed.

[0086] Grains (first-grade) that fall from the oscillating screening disc 43 after passing through the screening section 8 are conveyed towards the grain bin 10 via the first-grade conveyor 45 and the winnowing conveyor (not shown) connected to the first-grade conveyor 45. Second-grade grains are returned to the threshing start side of the threshing cylinder 41 via the second-grade conveyor 46, the reduction conveyor 48 connected to the second-grade conveyor 46, and the upper conveyor 49, and are threshed again. Straw scraps and the like are discharged into the field through the dust outlet located at the rear of the screening section 8.

[0087] Next, use Figure 4 The power transmission structure of the combine harvester 1 according to this embodiment will be described. The combine harvester 1 drives the cutting section 3, the traveling section 4, the threshing section 7, the screening section 8, and the grain storage section 9 by the rotational power of the engine 25.

[0088] The rotational power of the output shaft 25a of the engine 25 is transmitted to the first auxiliary shaft 51 via a first belt drive mechanism 52 provided between the output shaft 25a and the first auxiliary shaft 51. On the other hand, the rotational power of the engine 25 is transmitted via an auger clutch 53 to the grain storage section 9, which includes various conveyors such as the lower discharge conveyor 11, the longitudinal conveyor 12, and the grain discharge conveyor 13. Furthermore, the engine 25 includes a work pump shaft that drives a replenishment pump 54 that operates the lifting cylinder 39, etc.

[0089] The rotational power transmitted from the output shaft 25a of the engine 25 to the first auxiliary shaft 51 is branched to: the power transmission system toward the threshing section 7, and the power transmission system toward the traveling section 4, the screening section 8, and the cutting section 3.

[0090] First, regarding the power transmission system toward the threshing section 7, the rotational power of the first auxiliary shaft 51 is transmitted toward the first rotor drive shaft 56 via the second belt drive mechanism 55. A threshing clutch 57 is provided in the second belt drive mechanism 55, which is used to transmit the rotational power of the first auxiliary shaft 51 to the first rotor drive shaft 56 in an arbitrary and intermittent manner.

[0091] The rotational power of the first rotor drive shaft 56 is transmitted to the rotor drive shaft 59 via the threshing speed change device 58, and the rotational power of the rotor drive shaft 59 is transmitted to the threshing drum shaft 41a via the third belt drive mechanism 60. The threshing speed change device 58 has a two-stage structure with a high-speed gear train and a low-speed gear train, and under the control of the control device of the combine harvester 1, it performs appropriate speed change operations using a predetermined actuator according to the type of crop being processed.

[0092] With this structure, the driving force of the engine 25 is transmitted toward the threshing section 7, which includes the threshing cylinder 41, etc. Furthermore, by operating the working clutch lever 23, the threshing clutch 57 is engaged / disengaged, thereby intermittently transmitting power toward the threshing section 7.

[0093] Next, regarding the power transmission system toward the traveling section 4, the rotational power of the first secondary shaft 51 is transmitted toward the second secondary shaft 62 via the fourth belt drive mechanism 61. The rotational power of the second secondary shaft 62 is transmitted toward the HST input shaft 64 via the fifth belt drive mechanism 63, and is input to the gearbox 65, which includes a traveling HST and a turning HST, via the HST input shaft 64. Here, "HST" refers to a hydraulic continuously variable transmission that uses a hydraulic motor to convert the hydraulic pressure generated by the hydraulic pump back into rotational force. The driving force of the gearbox 65 drives the drive sprocket 5a of the track section 5 constituting the traveling section 4 to rotate.

[0094] Furthermore, regarding the power transmission system toward the screening section 8, the rotational power of the second auxiliary shaft 62 is transmitted toward the first PTO drive shaft 67 via the sixth belt drive mechanism 66, and the rotational power of the first PTO drive shaft 67 is transmitted toward the second PTO drive shaft 69 via a transmission mechanism 68 including gears, etc. The rotational power of the second PTO drive shaft 69 is transmitted via a predetermined transmission mechanism to the front fan shaft 71a that rotates the front fan 71, the winnowing machine shaft 47a that rotates the winnowing machine 47, and the first-grade product conveyor shaft 45a that rotates the first-grade product conveyor 45. Additionally, the rotational power of the second PTO drive shaft 69 is transmitted toward the swing shaft 44a of the swing mechanism 44 via the first-grade product conveyor shaft 45a. Furthermore, the rotational power of the first-grade product conveyor shaft 45a is transmitted toward the second fan shaft 72a that rotates the second fan 72 via a predetermined transmission mechanism.

[0095] The rotational power of the swing shaft 44a is transmitted via a predetermined transmission mechanism to the second conveyor shaft 46a, which rotates the second-grade conveyor 46. The rotational power of the second conveyor shaft 46a is transmitted via a predetermined transmission mechanism to the longitudinal conveyor shaft 48a, which rotates the reduction conveyor 48. The rotational power of the longitudinal conveyor shaft 48a is transmitted via a predetermined transmission mechanism to the transverse conveyor shaft 49a, which rotates the upper conveyor 49.

[0096] Furthermore, regarding the power transmission system toward the cutting section 3, the rotational power of the second PTO drive shaft 69 is transmitted toward the cutting input shaft 38 via the seventh belt drive mechanism 73. Driven by the rotation of the cutting input shaft 38, the conveyor 36 within the feeding chamber 35 operates. A cutting clutch 75 is provided in the seventh belt drive mechanism 73, which transmits the rotational power of the second PTO drive shaft 69 to the cutting input shaft 38 in an arbitrary and intermittent manner. Additionally, a pulley 73a constituting the seventh belt drive mechanism 73 is fixedly provided at the right end of the cutting input shaft 38.

[0097] The rotational power of the cutting input shaft 38 is transmitted to the PF drive shaft 77 via the first chain drive mechanism 76. The rotational power of the PF drive shaft 77 is transmitted to the PF auger shaft 37a, which rotates the harrowing auger 37, via the second chain drive mechanism 78. Additionally, the rotational power of the PF drive shaft 77 is transmitted to the cutter drive shaft 32a, which drives the cutter device 32, via the eighth belt drive mechanism 80. Furthermore, the rotational power of the PF drive shaft 77 is transmitted to the reel shaft 34b, which rotates the harrowing reel 34, via a power transmission mechanism including the first reel sub-shaft 81 and the second reel sub-shaft 82.

[0098] With this structure, the driving force of the engine 25 is transmitted toward the cutting section 3. Furthermore, by operating the working clutch lever 23, the cutting clutch 75 is engaged / disengaged, thereby intermittently transmitting power toward the cutting section 3.

[0099] The combine harvester 1 according to this embodiment, which has the structure described above, includes a conveyor reversing mechanism. This mechanism, in order to eliminate clogging of the stalks in the feed section 30 (which serves as a conveying device) using a simple construction, uses the lifting and lowering motion of the feed section 30 to cause the conveyor 36 of the feed section 30 to operate in the opposite direction. That is, in a combine harvester 1 where the cutting section 3 has a feed section 30 and this feed section 30 is configured to rotate and lift about the cutting input shaft 38, the conveyor reversing mechanism causes the conveyor 36 to operate in the opposite direction by the lifting and lowering motion of the feed section 30. Hereinafter, using... Figures 5-10The reverse action mechanism of the conveyor is explained.

[0100] In the combine harvester 1 according to this embodiment, the feeding unit 30 has a conveyor 36 (equivalent to a conveying unit) within the feeding chamber 35, which is driven by a cutting input shaft 38. The cutting input shaft 38 receives power transmission axially in the left-right direction. The feeding unit 30 is configured to move up and down by rotating around the cutting input shaft 38 (equivalent to a conveying mechanism) relative to the main body of the combine harvester 1. That is, as described above, the feeding unit 30 is configured to move up and down around the cutting input shaft 38 by extending and retracting a lifting cylinder 39 provided between the feeding chamber 35 and the machine frame 6 (see reference). Figure 5 (Middle arrow A1).

[0101] like Figure 6 as well as Figure 7 As shown, the feeding chamber 35 has left and right side portions 91L and 91R, a lower surface portion 92, and an upper surface portion 93, which together form a cylindrical body with openings at both the front and rear ends. More specifically, as... Figure 5 As shown, the upper surface portion 9 has a rear surface portion 93a and a front surface portion 93b, which are respectively inclined planes. When viewed from the side, the upper surface portion 9 has a buckled surface shape with the front and rear central portions as the tops. Corresponding to the buckled surface shape of the upper surface portion 93, the left and right side portions 91L and 91R (see reference) Figure 6 as well as Figure 7 This also makes the upper part resemble a mountain.

[0102] At the rear end of such a feeding chamber 35, an opening 94 in the shape of a generally elongated rectangle is formed by the rear ends of each of the left and right side portions 91L and 91R, the lower surface portion 92, and the rear side surface portion 93a of the upper surface portion 93 (see reference). Figure 8 In addition, the front end of the lifting cylinder 39 is supported on the front of the lower surface 92 of the feeding chamber 35 by means of the shaft support 39a, so that it can rotate in the left and right direction as the rotation axis.

[0103] like Figures 5-8 As shown, the conveyor 36 is a chain conveyor, which includes: chains 95 arranged parallel to each other on the left and right sides within the feeding chamber 35, and a plurality of plates 96 mounted between the left and right chains 95. The plates 96 are located on the outer periphery of the chains 95. Each plate 96 is an elongated member with its long side along the mounting direction (left-right direction) between the left and right chains 95, and is a bent plate-shaped member with a crank-like or approximately "U"-shaped cross-section. The plates 96 are fixed to the chains 95 using fasteners such as bolts. In this embodiment, 15 plates 96 are mounted on the chains 95 at predetermined intervals along their long sides.

[0104] like Figure 7 as well as Figure 8 As shown, the conveyor 36 winds the rear portion of the chain 95 around a sprocket 97, which is positioned on either side of the support portion within the feed chamber 35 of the conveyor 36's drive shaft, i.e., the feed chamber 35 of the cut input shaft 38, in a manner that rotates integrally with the cut input shaft 38. On the other hand, as... Figure 5 as well as Figure 6 As shown, the front portion of the chain 95 is wound around a cylindrical front drum 98 located at the front end within the feed chamber 35. The front drum 98 is axially supported such that it can rotate between the left and right side portions 91L and 91R of the feed chamber 35 around a predetermined rotation axis, namely the conveyor driven shaft 98a, which is axially oriented in the left-right direction. In other words, the chain 95 is wound in a loop around the sprocket 97 and the front drum 98, and is driven by rotating the sprocket 97 as the cutting input shaft 38 rotates, thus maintaining the wound state while moving the plate 96. The conveyor 36 is configured such that the rear end of the sprocket 97 can exit through the rear opening 94 of the feed chamber 35 (see reference). Figure 8 It protrudes out, and the front end of the front drum 98 can protrude slightly from the front opening of the feed chamber 35.

[0105] With this structure, the conveyor 36 rotates counterclockwise (left-handed) in the direction of left-view observation via the cutting input shaft 38 (see reference). Figure 6 (Middle arrow B1), and drive in the forward direction (see reference). Figure 6 (Middle arrow B2) The stalks taken into the feeding chamber 35 by the rake auger 37 are hooked onto the plate 96 and conveyed diagonally upward and backward. That is, when the conveyor 36 is driven in the forward direction, the path portion of the straight chain 95 located below the sprocket 97 and the front drum 98 (the path portion of the chain 95 directly above the lower surface portion 92 of the feeding chamber 35) becomes a path portion moving from the front to the rear, and the path portion of the straight chain 95 located above the sprocket 97 and the front drum 98 becomes a loop portion moving from the rear to the front. The stalks conveyed by the conveyor 36 pass from the feeding chamber 35 through the threshing port 7a (see reference). Figure 1 And supply to the threshing section 7.

[0106] like Figure 7As shown, the cutting input shaft 38 is mounted between the left and right side portions 91L and 91R at the rear end of the feeding chamber 35, and protrudes outward from the side portions 91L and 91R. The cutting input shaft 38 is configured to be able to rotate relative to the feeding chamber 35 by means of bearing components or the like. Furthermore, both ends of the cutting input shaft 38 are supported such that they can rotate freely relative to the support brackets 100 (100L, 100R) respectively provided on the left and right sides of the rear end of the feeding chamber 35 by means of bearing components or the like.

[0107] like Figure 8 As shown, the support bracket 100 is a component with the vertical direction as its long side, and has: a bent plate-shaped base portion, which is configured to be approximately "L"-shaped when viewed from above by means of a fixing surface 101 and a supporting surface 102; and a plurality of horizontal plate-shaped ribs 103, which are mounted on the inside of the bent shape of the base portion. The support bracket 100 is configured such that the plate-shaped portion of one side of its base portion forming an approximately "L"-shaped shape when viewed from above, i.e., the fixing surface 101, faces the rearward side, and the plate-shaped portion of the other side of its base portion forming an approximately "L"-shaped shape when viewed from above, i.e., the supporting surface 102, faces the left and right inward sides.

[0108] The left and right support brackets 100L and 100R are configured such that the support surfaces 102 are located on the left and right outer sides of the feeding chamber 35, along the outer sides of the side portions 91L and 91R of the feeding chamber 35, and the support surfaces 102 are positioned opposite each other, with the base portions being approximately symmetrical to each other. In other words, the left and right support brackets 100L and 100R are configured such that the rear ends of the feeding chamber 35 are clamped between their respective support surfaces 102 from the left and right sides.

[0109] Furthermore, the support bracket 100 is configured to be fixed to the main body side of the combine harvester 1. Specifically, the support bracket 100 is fixed to the left and right support columns 105 (105L, 105R) located on the main body side of the combine harvester 1. The support columns 105 are components that constitute the frame of the main body of the combine harvester 1, and are erected in front of the threshing section 7 at two locations on the left and right sides of the traveling body 2. The left support bracket 100L is fixed to the front surface of the upper part of the left support column 105L, and the right support bracket 100R is fixed to the front surface of the upper part of the right support column 105R.

[0110] The support bracket 100 is fixed to the support column 105 by means of multiple fastening members 106, such as bolts, through which its fixing face 101 passes from the front, so that the fixing face 101 is in contact with the front surface of the support column 105. In this embodiment, each support bracket 100 is fixed to the support column 105 by means of four fastening members 106 arranged at predetermined intervals in the vertical direction.

[0111] Thus, the feeding unit 30 is supported in such a way that it can be raised and lowered relative to the support bracket 100 of the structure fixed to the main body side of the combine harvester 1, namely the support column 105, in the left-right direction as the axial direction. That is, the feeding unit 30 is configured such that, with the rear end of the feeding unit 30 held from the left and right by the left and right support brackets 100L and 100R, the cutting input shaft 38 is used as the rotation axis to be raised and lowered relative to the main body side.

[0112] In addition, such as Figure 5 , Figure 6 as well as Figure 8 As shown, a cutting position sensor 107 is provided at the front of the upper part of the support bracket 100L on the left side. This cutting position sensor 107 detects the cutting height (the height of the cutting section 3 relative to the main unit) by utilizing the rotation angle of the feeding chamber 35. Figure 8 as well as Figure 9 As shown, the cutting position sensor 107 is mounted on a sensor support plate 108 located in front of the fixed surface 101 of the support bracket 100L, and is supported on the host side. The support bracket 100L is fixed to the host side by four fastening members 106, and the sensor support plate 108 is fixedly supported by the two fastening members 106 through which the upper two fastening members 106 pass.

[0113] like Figure 9 as well as Figure 10 As shown, the cutting position sensor 107 includes a detection piece 107a that is rotatable along a left-right axis and protrudes forward. On the other hand, a rod-shaped detection pin 109 that acts on the detection piece 107a is protruding from the left side 91L of the feed chamber 35. The detection pin 109 is located above the detection piece 107a and acts on the detection piece 107a within a predetermined range of motion during the lifting and lowering operation of the feed unit 30, causing the detection piece 107a to rotate. With this structure, the cutting position sensor 107 detects the cutting height based on the amount of rotation of the detection piece 107a caused by the action of the detection pin 109 during the lifting and lowering operation of the feed unit 30.

[0114] In the combine harvester 1 with the above-described structure, a reversing mechanism 110 (see reference 110) is provided as a conveyor reversing mechanism that causes the conveyor 36 of the feed unit 30 to move in the opposite direction by means of the lifting action of the feed unit 30. Figure 8 as well as Figure 9 The reversing mechanism 110 transmits the upward movement of the feeding section 30 toward the cutting input shaft 38, and as the feeding section 30 rises, the cutting input shaft 38 rotates in the opposite direction (hereinafter referred to as the "reversing direction") to the direction of rotation during the feeding of the stalks (when the conveyor 36 is driven in the forward direction). That is, after the feeding section 30 has descended from its rising position, the reversing mechanism 110 engages the feeding chamber 35 with the cutting input shaft 38, thereby restricting the relative rotation of the cutting input shaft 38 with respect to the feeding chamber 35 in the forward direction. In this state, the feeding section 30 rises, and the cutting input shaft 38 and the feeding chamber 35 rotate together in the reversing direction.

[0115] Specifically, the following functions can be achieved with the reversing mechanism 110: The cutting input shaft 38 is supported on the main body side of the combine harvester 1 by means of the left and right support brackets 100, as described above, and is configured to be able to rotate relative to the feed chamber 35. In addition, the component constituting the reversing mechanism 110, namely the gear 120, is supported on the cutting input shaft 38, and similarly, the component constituting the reversing mechanism 110, namely the claw component 130, is supported on the feed chamber 35 side.

[0116] Therefore, when the relative rotation of the cutting input shaft 38 with respect to the feeding chamber 35 in the forward direction is restricted by the reversing mechanism 110, when the feeding unit 30 rotates upward about the cutting input shaft 38 as the rotation center, the cutting input shaft 38 is forced to rotate in the reverse direction together with the feeding chamber 35 and by an amount corresponding to the upward rotation of the feeding unit 30. That is, the direction of the upward rotation of the feeding chamber 35 (refer to...) Figure 6 (C1) and the clockwise (right-hand) rotation direction of the cutting input axis 38 when viewed from the left (refer to...) Figure 6 As indicated by the middle arrow C2), the cutting input shaft 38, which is engaged with the feeding chamber 35 by the reversing mechanism 110, can rotate in the reversing direction together with the feeding chamber 3, which is rotating upward.

[0117] Therefore, as a reversing mechanism 110 that uses the lifting action of the feeding section 30 to rotate the cutting input shaft 38 in the reverse direction, any structure that can achieve the aforementioned engaging action on the cutting input shaft 38 is acceptable. That is, as a reversing mechanism 110, any structure that, in which the cutting input shaft 38 supported on the main unit side rotates relative to the feeding chamber 35, can at least restrict the relative rotation in the forward direction. Hereinafter, the specific structure of the reversing mechanism 110 according to this embodiment will be described.

[0118] like Figures 5-8 As shown, the reversing mechanism 110 is located on the left and right sides of the feed chamber 35, specifically on the outer side of the main unit of the combine harvester 1 in the left-right direction. That is, in this embodiment, the feed unit 30 is located on the left side of the cab 16, and the left side of the feed chamber 35 is located on the outer side of the main unit of the combine harvester 1 in the left-right direction. The reversing mechanism 110 is located on the left side of the rear end of the feed chamber 35.

[0119] The reversing mechanism 110 includes a gear 120 supported on the cutting input shaft 38 as a first engaging member, and a claw member 130 engaging with the gear 120. Furthermore, the reversing mechanism 110 is configured to include a ratchet mechanism that restricts the lifting and lowering movement of the feed section 30, which rotates the cutting input shaft 38 by means of the gear 120, to a rising movement of the feed section 30.

[0120] like Figure 9 as well as Figure 10 As shown, gear 120 is supported on: a protrusion 38a of the cutting input shaft 38 extending to the left from inside the feed chamber 35 (see reference). Figure 12 Gear 120 is an annular plate-shaped component through which the input shaft 38 passes, and has a plurality of teeth 121 on the inner circumferential side of gear 120, that is, on the outer circumferential side of the main body. The teeth 121 have a mountain-shaped form that is approximately triangular when viewed in the direction of the rotation axis of gear 120. Between adjacent teeth 121 along the circumferential direction of gear 120, there are engagement recesses 122 that are approximately “V”-shaped when viewed in the direction of the rotation axis of gear 120.

[0121] like Figures 5-8As shown, the claw member 130 is positioned to be supported on the feeding section 30, and by engaging with the gear 120, transmits the upward movement of the feeding section 30 towards the cutting input shaft 38 via the gear 120. The claw member 130 is located on the left side of the feeding chamber 35, in front of the gear 120. The claw member 130 is a plate-shaped member with a defined shape, and is rotatably positioned in the left-right direction along the plate thickness. The claw member 130 has a plate thickness that is approximately the same as or thinner than the gear 120, and is positioned so that its left-right position is approximately the same as that of the gear 120 (see reference). Figure 7 ), so that it can engage with gear 120.

[0122] like Figure 7 as well as Figure 9 As shown, the claw member 130 is configured to rotate relative to the left side portion 91L of the feed chamber 35 constituting the feed section 30. The claw member 130 is supported by a support shaft 131 that protrudes to the left from the side portion 91L and has a left-right axis, so that it can rotate in the left-right direction.

[0123] like Figure 9 as well as Figure 10 As shown, the protruding tip of the cylindrical portion of the support shaft 131 is a reduced diameter portion 131a, which extends through the claw member 130. The reduced diameter portion 131a receives the engagement of the retaining ring 135b via the washer 135a, thereby supporting the claw member 130 so that it can rotate. In addition, the support shaft 131 is supported on its lower front side by a reinforcing support plate 136, which is disposed between the support shaft 131 and the side portion 91L.

[0124] The claw component 130 includes: a support base 132, which is a support portion based on and through a support shaft 131; and a claw body 133, which protrudes upward from the support base 132. The support base 132 has a shape extending around the support shaft 131, and the claw body 133 is provided on the upper side of the support base 132. The claw body 133 has a shape that bends rearward from the upper side of the support base 132, and at the tip of the claw body 133 is a sharp engaging portion 134 that forms an acute angle towards the rear of the gear 120. The claw component 130 is engaged with the gear 120 by engaging the sharp engaging portion 134 with the engaging recess 122 of the gear 120. The sharp engaging portion 134 has an outer shape that corresponds to the approximately "V"-shaped concave shape of the engaging recess 122 in a manner that engages with the engaging recess 122.

[0125] With this structure, the claw member 130 rotates clockwise (right-handed) when viewed from the left, causing the sharp engaging portion 134 to engage with the engaging recess 122 located in front of the gear 120, thereby engaging the claw member 130 with the gear 120. On the other hand, by rotating the claw member 130, which is engaged with the gear 120, counterclockwise (left-handed) when viewed from the left, the engagement of the claw member 130 with the gear 120 is released.

[0126] The claw component 130 is force-applied by the spring 140, which acts as a force-applying component, in the direction of engagement with the gear 120, i.e., the right-hand rotation direction when viewed from the left (hereinafter referred to as the "engagement direction"). The spring 140 is a tension coil spring that provides tension to the claw component 130 in the engagement direction. The spring 140 is located on the rear lower side relative to the claw component 130. Figure 10 (Lower right side), by stretching the rear part of the claw component 130 downwards, force is applied to the claw component 130 in the engaging direction based on elastic force.

[0127] Specifically, the hook 140a at one end, i.e., the upper end, of the spring 140 is engaged with the locking pin 141, which passes through the rear side of the support portion of the claw member 130 supported by the pivot 131. Figure 10 The upper end of the spring 140 (right side) is hooked to the right side of the locking pin 141 of the through claw component 130. Figure 10 The protruding part (on the inner side).

[0128] On the other hand, the hook 140b at the other end of the spring 140, i.e. the lower end, is engaged with a support plate 14 fixed to the side portion 91L of the feed chamber 35 by welding or the like. The support plate 142 is located below the claw member 130. The support plate 142 is composed of a bent plate-like portion that protrudes from the side portion 91L toward the left and has a predetermined bent shape, and has a horizontal plate portion 142a that is inclined along the feed chamber 35 with a lower front and a higher rear, and a vertical plate portion 142b that bends upward at a right angle relative to the horizontal plate portion 142a from the rear edge of the horizontal plate portion 142a.

[0129] For such a support plate 142, the spring 140 is locked and supported on the support plate 142 with its lower hook portion 140b passing through the locking hole 142c formed in the longitudinal plate portion 142b.

[0130] Furthermore, the rotational movement centered on the pivot 131 of the claw component 130 is operated via an operation line 145, which is a line member connected to the claw component 130. One end of the operation line 145 is connected to the claw component 130 by means of a connecting member 146. The connecting member 146 is a long-side member that is generally rectangular in side view and open at the top when viewed from the front surface. The upper end of the connecting member 146 is connected to a locking pin 147, which locks the front side of the support portion of the claw component 130 supported by the pivot 131. Figure 10 The portion extending through to the left side of the center. The locking pin 147, through which the claw component 130 passes, faces to the right (…). Figure 10 The upper end of the connecting member 146 is connected to the protruding portion (on the inner side). A locking pin 147 passes through an elongated hole 146a formed in the connecting member 146 along its long side, and is supported on the connecting member 146 by the passage of the pin. Thus, the connecting member 146 is configured to be movable relative to the locking pin 147 along the long side of the elongated hole 146a. On the other hand, one end of an operating line 145 is connected to the lower end of the connecting member 146.

[0131] The operating line 145 is extended in such a state that a tubular line support member 148, which is fixedly supported on the cross plate portion 142a of the support plate 142, passes through it and is covered by a flexible covering tube 149. The line support member 148 is fixedly supported on the cross plate portion 142a by means of a nut member or the like, as it passes vertically through the cross plate portion 142a. The other end of the operating line 145 is connected to a specified operating member provided on the driving unit 15 by means of a member constituting a specified linkage mechanism (linkage mechanism 300) described later, so that it can be operated by the specified operating member.

[0132] The locking pin 141 for locking the spring 140 to the claw member 130 and the locking pin 147 for connecting the operating line 145 to the claw member 130 are located on approximately opposite sides of the front and rear of the claw member 130, such that the support position of the support shaft 131 is clamped between the locking pins 141 and 147. That is, the locking pin 141 for the spring 140 is located behind the support shaft 131, and the locking pin 147 for the operating line 145 is located in front of the support shaft 131.

[0133] Furthermore, between the claw component 130 and the support plate 142, the mounting direction (extension direction) of the spring 140 and the extension direction of the operating line 145 are both approximately vertically inclined in a forward-leaning manner. Moreover, the claw component 130 is constantly subjected to a downward tension from the spring 140, thereby causing it to rotate back and forth like a seesaw around the support shaft 131 depending on the presence or absence of the downward tension from the operating line 145.

[0134] use Figure 10 The operation of the reversing mechanism 110 will be explained. Typically, as... Figure 10 As shown, the reversing mechanism 110 is not in operation, and the claw component 130 is in a non-engaged position, moving from a rotational position engaged with the gear 120 (hereinafter referred to as the "engaged position") to a position opposite to the engagement direction (hereinafter referred to as the "anti-engaged direction"). In other words, the reversing mechanism 110 is in a non-operating state, and the cutting input shaft 38 is in a non-engaged state relative to the feeding chamber 35. The claw component 130 is kept in the non-engaged position by the tension of the operating line 145, which stretches the claw component 130 toward the anti-engaged direction, overcoming the force exerted by the spring 140 toward the engagement direction.

[0135] Furthermore, by operating the prescribed operating element that operates the operating line 145, the operation to put the reversing mechanism 110 into working state is performed, thereby releasing the tension of the operating line 145 on the claw member 130. As a result, the claw member 130 rotates in the engaging direction under the force of the spring 140 (refer to arrow D1), reaching the engaging position. The sharp engaging portion 134 engages with the engaging recess 122 located on the front side of the gear 120, and the claw member 130 is engaged with the gear 120. In other words, the reversing mechanism 110 is in working state, and the cutting input shaft 38 is engaged relative to the feeding chamber 35.

[0136] Starting from the operating state of the reversing mechanism 110, an operation is performed using a predetermined operating element to deactivate the reversing mechanism 110, thereby stretching the operating line 145. Accordingly, the pawl member 130 rotates against the force of the spring 140 in the reverse engagement direction (opposite to arrow D1), the engagement of the pawl member 130 with respect to the gear 120 is released, the pawl member 130 reaches the non-engaged position, and the reversing mechanism 110 returns to the deactivating state.

[0137] Furthermore, in the connection structure between the operating line 145 and the claw member 130, a gap is provided in the direction of action of the operating line 145 by utilizing a structure that engages the locking pin 147 with the elongated hole 146a of the connecting member 146. This prevents unintentional engagement of the claw member 130 with the gear 120, thereby enabling reliable switching between the operating and non-operating states of the reversing mechanism 110.

[0138] Furthermore, regarding the engagement mechanism between gear 120 and claw component 130, the reversing mechanism 110 has a ratchet-type structure, namely: when the claw component 130 is engaged with gear 120 (operating state), the gear 120 is allowed to rotate relative to the direction of rotation of the conveyor 36 relative to the feeding chamber 35, that is, the right-hand rotation direction when viewed from the side. In other words, each tooth 121 of gear 120 is inclined in the circumferential direction of gear 120 relative to the radial direction of gear 120 towards the forward rotation direction of the conveyor 36 (the left-hand rotation direction in the side view), so that in the operating state of the reversing mechanism 110, the relative rotation direction of gear 120 relative to the feeding chamber 35 is restricted to a direction corresponding to the direction of rotation of the cutting input shaft 38 in the reverse direction.

[0139] According to this structure, when the cutting input shaft 38 rotates integrally with the feeding chamber 35 due to blockage such as stalks within the feeding chamber 35 during its lifting and lowering motion, the reversing mechanism 110 becomes operational, thereby achieving the following effect: When the feeding section 30 rises, the gear 120 rotates in the direction corresponding to the reversing direction of the conveyor 36 (reversing direction) along with the rising feeding chamber 35. On the other hand, when the feeding section 30 descends, the gear 120 is allowed to rotate relative to the feeding chamber 35. Here, the direction of relative rotation of the gear 120 is the reversing direction. That is, when the feeding chamber 35 descends, the gear 120 is allowed to rotate relative to the feeding chamber 35, thereby causing the cutting input shaft 38 to rotate relative to the feeding chamber 35 in the reversing direction via the gear 120. Thus, based on the ratchet structure including the gear 120 and the claw component 130, the lifting and lowering action of the feed section 30, which rotates the cutting input shaft 38 by means of the gear 120, is limited to the lifting action of the feed section 30.

[0140] Therefore, when the reversing mechanism 110 is in operation, during the upward movement of the feeding section 30, the gear 120 rotates integrally with the feeding chamber 35 in the reversing direction. During the downward movement of the feeding section 30, the gear 120 rotates relative to the feeding chamber 35 in the reversing direction. In other words, both during the upward and downward movement of the feeding section 30, the cutting input shaft 38 can be rotated in the reversing direction by means of the gear 120. Therefore, by repeatedly performing the lifting and lowering movements of the feeding section 30, the cutting input shaft 38 can be rotated in the reversing direction each time an upward / lowering movement occurs.

[0141] As described above, the reversing mechanism 110 of this embodiment includes a gear 120 supported on the cutting input shaft 38 and a claw member 130 that is forceped in the direction of engaging with the gear 120 (engaging direction). The reversing mechanism 110 is configured to include a ratchet mechanism that restricts the lifting and lowering movement of the feed section 30, which rotates the cutting input shaft 38 by means of the gear 120, to the rising movement of the feed section 30.

[0142] According to the reversing mechanism 110 of this embodiment described above, when the reversing mechanism 110 is in operation, the feed section 30 rotates upward, and the gear 120 supported on the cutting input shaft 38 rotates in a direction corresponding to the reversing direction of the cutting input shaft 38 by an amount corresponding to the rotation of the feed section 30. Utilizing the rotational action of the gear 120 in the reversing direction, the cutting input shaft 38 rotates in the reversing direction. As a result, the conveyor 36 operates in the reversing direction, and the blockage of the stalks in the feed section 30 is cleared.

[0143] Here, for example, if the gear 120 is fixedly mounted coaxially with respect to the cutting input shaft 38, that is, if the gear 120 and the cutting input shaft 38 rotate as a unit, the amount of rotation of the gear 120 in the reverse direction as the feed section 30 rises is transmitted to the cutting input shaft 38 in a 1:1 ratio, causing the conveyor 36 to operate in the reverse direction. On the other hand, in such a configuration, the travel of the lifting and lowering motion of the feed section 30 is limited, so the amount of rotation of the cutting input shaft 38 that causes the conveyor 36 to operate in the reverse direction may not be sufficient to clear the blockage of the stalks.

[0144] Therefore, the combine harvester 1 according to this embodiment includes an amplification mechanism 200, which amplifies the rotation of the gear 120 that rotates by receiving the upward movement of the feed unit 30 via the claw member 130, and transmits it toward the cutting input shaft 38. Figures 11-13 The explanation of the increase mechanism 200 is as follows.

[0145] like Figure 12 As shown, the cutting input shaft 38 is supported by a cylindrical shaft support member 201 through which the cutting input shaft 38 passes, and is rotatable relative to the left side portion 91L of the feed chamber 35 and the support bracket 100L located on the left side of the side portion 91L.

[0146] The shaft support member 201 has a flange portion 201a, which is an enlarged diameter portion, on the right side. The right end of the flange portion 201a is inserted into a shaft support hole 91a formed in the side surface portion 91L, and the flange portion 201a extends along the outer side surface (left side surface) of the side surface portion 91L. The shaft support member 201 is fixed to multiple locations on the side surface portion 91L by means of a fixing bolt 202 that passes through the inside of the side surface portion 91L.

[0147] Furthermore, the shaft support member 201 inserts its cylindrical portion, which is further to the left of the flange portion 201a, into the shaft support hole 100a formed in the support bracket 100L in a manner that allows relative rotation. The protruding portion 38a of the cutting input shaft 38, extending to the left from the side portion 91L, passes through the shaft support member 201, and the shaft support member 201 supports the cutting input shaft 38 so that it can rotate relative to the shaft by means of a bearing member 203 fixed to it. Additionally, a bearing 204 is clamped between the right end of the shaft support member 201 and the cutting input shaft 38.

[0148] The cutting input shaft 38 protrudes to the left from the support bracket 100L, and a gear 120 is supported on its protruding portion 38a. The gear 120 is positioned near the left side of the support bracket 100L. When the reversing mechanism 110 is in operation, the amplifying mechanism 200 amplifies the rotation of the gear 120 caused by the rising of the feed section 30 and transmits it toward the cutting input shaft 38.

[0149] The amplification mechanism 200 includes: an input shaft-side gear supported on the cutting input shaft 38; an idler shaft 215 serving as a transmission shaft parallel to the cutting input shaft 38; and a transmission shaft-side gear supported on the idler shaft 215 and meshing with the input shaft-side gear. In this embodiment, as... Figures 11-13 As shown, the amplification mechanism 200 has a first gear 211 and a fourth gear 214 as input shaft-side gears, and a second gear 212 and a third gear 213 as transmission shaft-side gears.

[0150] like Figure 12 As shown, the first gear 211 is positioned adjacent to the left side of the gear 120. The first gear 211 is supported on the cutting input shaft 38 in a manner rotatable relative to the cutting input shaft 38 by means of two axially adjacent bearings 216, 216. The first gear 211 rotates integrally with the gear 120, thus coaxially supporting the gear 120, through which the cutting input shaft 38 passes, at the axis of the cutting input shaft 38.

[0151] The first gear 211 has a support cylinder portion 211a, which protrudes cylindrically from the right side of the first gear 211 at predetermined intervals relative to the outer peripheral surface of the cutting input shaft 38. With the support cylinder portion 211a inserted into the inner peripheral hole 120a of the gear 120 from the left, the first gear 211 is fixed to the gear 120 using a fixing bolt 217. The fixing bolt 217 passes through a bolt hole 211b formed in the first gear 211 from the left and is screwed into the main body of the gear 120. The fixing portions based on the fixing bolts 217 are provided at multiple locations (six locations in this embodiment) at equal intervals around the axis of the cutting input shaft 38. The outer diameter of the first gear 211 is approximately the same as the outer diameter of the gear 120.

[0152] The idler shaft 215 is located below the cutting input shaft 38 and is positioned on the left side of the side portion 91L of the feed chamber 35 with its axial direction pointing left and right. The idler shaft 215 has a length approximately the same as the protruding portion 38a of the cutting input shaft 38 extending to the left from the side portion 91L.

[0153] One end of the idler shaft 215, i.e. the right end, is rotatably supported by a bearing 218 in a lower shaft support hole 100b formed in the support bracket 100L. On the other hand, the other end of the idler shaft 215, i.e. the left end, is supported by the lower part of a mounting support plate 220 that supports the left end of the cutting input shaft 38.

[0154] The lower part of the support plate 220 has a short cylindrical bearing support 220a with the left-right direction as the axis of the cylinder. The left end of the idler shaft 215 is rotatably supported in the bearing support 220a by means of a bearing 221. The support plate 220 is a plate-shaped member with a generally chamfered rectangular shape with the vertical direction as the long side when viewed from the side. It supports the left ends of the cut-in input shaft 38 and the idler shaft 215 respectively, and is set in a position between the left ends of these shafts.

[0155] A second gear 212 is provided on the idler shaft 215 at a position corresponding to the first gear 211 in its axial direction. The second gear 212 is fixed to the idler shaft 215 by welding or the like, thereby rotating integrally with the idler shaft 215. The diameter of the second gear 212 is smaller than that of the first gear 211, and it functions as a pinion relative to the first gear 211.

[0156] In this embodiment, the first gear 211 has 38 teeth and the second gear 212 has 19 teeth. That is, the gear ratio between the first gear 211 and the second gear 212 is 1 / 2, and the speed-increasing ratio for the rotation from the first gear 211 to the second gear 212 is 2.

[0157] A third gear 213 is provided to the left of the second gear 212 on the idler shaft 215. The third gear 213 is fixed to the idler shaft 215 by welding or the same method as the second gear 212, thereby rotating integrally with the idler shaft 215. The third gear 213 is a gear with a diameter larger than that of the second gear 212. In this embodiment, the third gear 213 has 38 teeth.

[0158] A fourth gear 214 is provided on the cutting input shaft 38 at a position corresponding to the third gear 213 in its axial direction, meshing with the third gear 213. The third gear 213 is positioned approximately adjacent to the left side of the first gear 211. The fourth gear 214 is configured such that it cannot rotate relative to the cutting input shaft 38 via a parallel key 222, thereby rotating integrally with the cutting input shaft 38. The parallel key 222 engages with keyways formed on the outer circumferential surface of the cutting input shaft 38 and the inner circumferential surface of the fourth gear 214 along the axial direction of the cutting input shaft 38. The diameter of the fourth gear 214 is smaller than that of the third gear 213, functioning as a pinion relative to the third gear 213.

[0159] In this embodiment, the fourth gear 214 has 19 teeth, compared to the third gear 213 which has 38 teeth. That is, the gear ratio between the third gear 213 and the fourth gear 214 is 1 / 2, and the speed-increasing ratio for the rotational transmission from the third gear 213 to the fourth gear 214 is 2.

[0160] Furthermore, the left end of the cutting input shaft 38 is supported on the upper part of the mounting support plate 220 by means of the fourth gear 214. The fourth gear 214 has a cylindrical support cylinder 214a on the left side of its main body portion, which has teeth that mesh with the third gear 213 formed on its outer circumference, through which the cutting input shaft 38 passes. On the other hand, the upper part of the mounting support plate 220 has a short cylindrical bearing support portion 220b with the cylindrical axis in the left-right direction. Within this bearing support portion 220b, the support cylinder portion 214a of the fourth gear 214 is rotatably supported by means of a bearing 223. In other words, the left end of the cutting input shaft 38 is rotatably supported on the upper part of the mounting support plate 220 by means of the fourth gear 214 and the bearing 223.

[0161] The cutting input shaft 38 is such that the left end, on which the external thread 38b is formed, protrudes from the support plate 220 toward the left. The protruding portion of the cutting input shaft 38 protruding from the support plate 220 is supported by means of a locking part 224, which engages the nut 255 with the external thread 38b. The locking part 224 is composed of a washer or retaining ring through which the cutting input shaft 38 passes.

[0162] Based on the above-mentioned increase mechanism 200, such as Figure 12 as well as Figure 13 As shown, in the operating state of the reversing mechanism 110, the gear 120 receives the transmission of the upward movement of the feed section 30 via the claw member 130 and rotates in the reversing direction. The rotation of the gear 120 is the rotation of the first gear 211, which rotates integrally with the gear 120 relative to the cutting input shaft 38. The rotation of the first gear 211 is transmitted to the idler shaft 215 via the second gear 212 meshing with it. Here, due to the speed increase ratio between the first gear 211 and the second gear 212, the rotational amount of the first gear 211 increases and is transmitted towards the idler shaft 215. In this embodiment, as described above, the speed increase ratio between the first gear 211 and the second gear 212 is 2, and the rotational amount of the first gear 211 is increased to twice its original value and transmitted towards the idler shaft 215.

[0163] The rotation of the idler shaft 215 is transmitted toward the cutting input shaft 38 via a third gear 213 that rotates integrally with the idler shaft 215 and a fourth gear 214 that meshes with the third gear 213. Here, due to the speed increase ratio between the third gear 213 and the fourth gear 214, the rotational amount of the third gear 213 increases and is transmitted toward the fourth gear 214. Since the fourth gear 214 rotates integrally with the cutting input shaft 38, its rotational amount remains constant and becomes part of the rotational amount of the cutting input shaft 38. In this embodiment, as described above, the speed increase ratio between the third gear 213 and the fourth gear 214 is 2, the rotational amount of the third gear 213 increases to twice its original value, and is transmitted toward the cutting input shaft 38 via the fourth gear 214.

[0164] Thus, according to the amplification mechanism 200, when the reversing mechanism 110 is in operation, the rotation of the gear 120 integrated with the feeding unit 30 in the reversing direction is accelerated according to the following sequence: first gear 211 → second gear 212 → idler shaft 215 → third gear 213 → fourth gear 214 → cutting input shaft 38, while the rotation in the reversing direction of the cutting input shaft 38 is transmitted. Furthermore, in this embodiment, through the speed increase ratio between the first gear 211 and the second gear 212, and the speed increase ratio between the third gear 213 and the fourth gear 214, the rotation of the gear 120 is accelerated to a fourfold increase in two stages and transmitted towards the cutting input shaft 38. Moreover, the number of gears in the amplification mechanism 200, the number of teeth on each gear, and the speed increase ratio between gears are not particularly limited to the structure of this embodiment.

[0165] Additionally, among the 200 amplification institutions, such as Figure 11 As shown, the rear part of the support plate 220, which supports the left ends of the cutting input shaft 38 and the idler shaft 215 as described above, has a support surface 220c that bends inward (to the right) at approximately a right angle. In other words, the support plate 220 has a plate-shaped main body 220d, which supports the left ends of the cutting input shaft 38 and the idler shaft 215, with its thickness in the left-right direction; and a plate-shaped support surface 220c, with its thickness in the front-back direction. When viewed from above, the support plate 220 is approximately "L"-shaped.

[0166] The support plate 220 is configured such that the support surface 220c contacts or substantially contacts the front side of the left-side support column 105L on the main unit side. In the support plate 220, the rear surface 220e of the rear support surface 220c is used as the contact surface that contacts the front surface of the left-side support column 105L, thereby making the rear support surface 220c a support portion for the support column 105L.

[0167] That is, when the reversing mechanism 110 is in operation, as the feeding section 30 rises, the cutting input shaft 38 receives a rearward action via the claw member 130 and the gear 120. In other words, the cutting input shaft 38 wants to retract rearward. Therefore, by making the support surface 220c of the support plate 220 that supports the left end of the cutting input shaft 38 a support for the support column 105L, the rearward movement of the cutting input shaft 38 is restricted, and the rearward retraction of the cutting input shaft 38 can be prevented. As a result, a stable engagement state of the claw member 130 relative to the gear 120 can be obtained.

[0168] Furthermore, in the amplification mechanism 200, the reaction force from the meshing of the input shaft-side gear supported on the cutting input shaft 38 and the transmission shaft-side gear supported on the idler shaft 215 generates a force that causes the shafts of the cutting input shaft 38 and the idler shaft 215 to separate from each other. Therefore, as... Figure 12 As shown, the structure is as follows: the support plate 220 is set in the erected state between the cutting input shaft 38 and the idler shaft 215, and the left end of each shaft is supported by the support plate 220.

[0169] With this structure, the distance between the input shaft 38 and the idler shaft 215 remains fixed. This restricts the input shaft-side gear and the transmission shaft-side gear constituting the amplification mechanism 200 from being separated, thereby achieving a stable meshing state for the meshing of these gears.

[0170] As described above, by mounting the support plate 220, a stable operating state can be obtained in the reversing mechanism 110 and the amplifying mechanism 200, thereby reliably obtaining the reversing action of the conveyor 36 based on the reversing mechanism 110 and the speed-up transmission action of the rotation based on the amplifying mechanism 200.

[0171] Next, the structure related to the operation of the reversing mechanism 110 in the combine harvester 1 according to this embodiment will be described.

[0172] As described above, the reversing mechanism 110 is operated by means of the operating line 145 and a predetermined operating member. In this embodiment, the operating member of the reversing mechanism 110 is the working clutch lever 23 (see reference 145). Figure 14 as well as Figure 15 The working clutch lever 23 is located on the driver's unit 15, and is used for the threshing clutch 57 and the cutting clutch 75 (see reference). Figure 4 Perform the connection and disconnection operation.

[0173] That is, the combine harvester 1 of this embodiment is configured such that the operation / non-operation of the reversing mechanism 110 is operated by operating the operating clutch lever 23, which is used to operate the cutting section 3 and the threshing section. Therefore, the other end of the operating line 145 is connected to the operating clutch lever 23 by means of a component of the linkage mechanism 300 provided between the claw member 130 and the operating clutch lever 23, so that the reversing mechanism 110 can be operated by the operating clutch lever 23. In other words, the claw member 130 is linked to the operating clutch lever 23 by means of the linkage mechanism 300 including the operating line 145.

[0174] use Figure 14 as well as Figure 15The operating structure and operating mode of the working clutch lever 23, which serves as the operating element of the reversing mechanism 110, will be explained. For example... Figure 14 As shown, the operating clutch lever 23 includes: a rod-shaped lever body portion 23a having a predetermined shape; and a generally spherical gripping portion 23b disposed at the upper end of the lever body portion 23a.

[0175] The operating clutch lever 23 is configured such that it protrudes upward from the lever guide portion 150 provided on the lever post 24, which is located on the left side of the driver's seat 17. With the lever body portion 23a of the operating clutch lever 23 through, the lever guide portion 150 guides the movement of the operating clutch lever 23 along a predetermined operating path, wherein this predetermined operating path is used to stop multiple operating positions corresponding to predetermined operating contents. Furthermore, the lever body portion 23a has a predetermined bent shape, extending upward from the lever post 24 and tilting towards the driver's seat 17 side, i.e., the right side.

[0176] The rod guide portion 150 has a guide opening 151 formed on the upper surface portion 24a of the rod post 24, and a guide plate 152 disposed below the guide opening 151.

[0177] The guide opening 151 has a defined opening shape along the operating movement path of the working clutch lever 23. The guide plate 152 has a rectangular shape when viewed from above. A plate opening 152a is formed on the guide plate 152, which is smaller than the opening size of the guide opening 151, so that it is included within the opening range of the guide opening 151 when viewed from above, and the plate opening 152a has an opening shape that follows the opening shape of the guide opening 151. The plate opening 152a is covered by a plate-shaped cover member 153 that can elastically deform. The cover member 153 has an opening through which the lever body portion 23a of the working clutch lever 23 passes. The opening of the cover member 153 includes a slit-like portion along the movement path of the working clutch lever 23, and a wide portion with a generally circular shape at each operating position of the working clutch lever 23.

[0178] The lever guide 150 has a first moving path portion 161 along the left-right direction, a second moving path portion 162 extending forward from the right end of the first moving path portion 161, and a third moving path portion 163 extending rearward from the left end of the first moving path portion 161, which serve as path portions constituting the operating moving path of the operating clutch lever 23. The lever guide 150 is configured to have a generally crank shape overall through these moving path portions. Furthermore, in Figure 14 For convenience, each movement path is schematically represented by a shaded area.

[0179] Furthermore, the operating clutch lever 23 designates the corner portions between the first and third movement path portions 161 and 163, the corner portions between the first and second movement path portions 162, the front end portion of the second movement path portion 162, and the rear end portion of the third movement path portion 163 in the lever guide portion 150 as operating positions corresponding to the prescribed operating content. This is described in detail below.

[0180] The operating clutch lever 23 has the following four operating positions: a stop operation position P0 corresponding to the corner between the first moving path section 161 and the third moving path section 163; a first operating operation position P1 corresponding to the corner between the first moving path section 161 and the second moving path section 162; a second operating operation position P2 corresponding to the front end of the second moving path section 162; and a reverse operation position P3 corresponding to the rear end of the third moving path section 163.

[0181] The stop operation position P0 is an operation position in which the transmission of power to the cutting section 3 and the threshing section 7 is disconnected and the reversing mechanism 110 is in a non-operating state. That is, the operating clutch lever 23 is in the stop operation position P0 (see reference...). Figure 15 Under (a)), the cutting clutch 75 and the threshing clutch 57 (see reference) Figure 4 When the clutch lever 23 is in the disengaged state, the claw component 130 in the reversing mechanism 110 is in the non-engaged position, and the cutting input shaft 38 is in the non-engaged state relative to the feeding chamber 35. In other words, the state in which the working clutch lever 23 is in the stop operation position P0 is called the neutral state. In this embodiment, a stop display section 170 displaying the word "disengaged" is provided on the surface of the lever 24 near the stop operation position P0.

[0182] The first operating position P1 is a position where the vehicle has moved a predetermined amount of distance from the stop operating position P0 in the first direction, i.e., to the right, and where the transmission of power toward the threshing section 7 is engaged. That is, the operating position P1 is when the operating clutch lever 23 is in the first operating position P1 (refer to...). Figure 15 In (b) of this embodiment, the cutting clutch 75 is in the disengaged state, the threshing clutch 57 is in the engaged state, the reversing mechanism 110 is in the non-operating state, and the threshing section 7 is in the operating state. In this embodiment, a threshing display section 171 displaying the word "threshing" is provided on the surface of the rod 24 near the first operating position P1.

[0183] The second operating position P2 is a position where the power transmission towards the threshing section 7 is engaged while simultaneously engaging the power transmission towards the cutting section 3, moving a predetermined amount from the first operating position P1 in the third direction (i.e., forward). In other words, this is the operating position where the operating clutch lever 23 is in the second operating position P2 (refer to...). Figure 15 Under (c) conditions, the cutting clutch 75 and the threshing clutch 57 are engaged, the reversing mechanism 110 is not in operation, and the cutting section 3 and the threshing section 7 are in operation. In this embodiment, a cutting display section 172 displaying the word "cutting" is provided on the surface of the rod 24 near the second operation position P2.

[0184] The reverse operation position P3 is: a position where the operation has moved a predetermined amount from the stop operation position P0 in a second direction different from the first direction, i.e., rearward, and is an operation position that puts the reverse mechanism 110 into operation. That is, the state where the working clutch lever 23 is in the reverse operation position P3 (refer to...). Figure 15 Under condition (d), the cutting clutch 75 and the threshing clutch 57 are disengaged, the claw component 130 in the reversing mechanism 110 is in the engaged position, and the cutting input shaft 38 is engaged relative to the feeding chamber 35. In this embodiment, a cutting reversal display section 173 displaying the words "cutting reversal" is provided on the surface of the lever 24 near the reversing operation position P3.

[0185] As described above, in the combine harvester 1 according to this embodiment, the working clutch lever 23 has a first working operation position P1 and a second working operation position P2 as working operation positions. Each working operation position is a position where the harvester has moved at least a predetermined amount in a first direction from the stop operating position P0, and the transmission of power toward at least one of the cutting section 3 and the threshing section 7 is engaged. Specifically, the first working operation position P1 is a working operation position where the harvester has moved a predetermined amount in a first direction (to the right) from the stop operating position P0, and the transmission of power toward the threshing section 7 is engaged. The second working operation position P2 is a working operation position where the harvester has moved a predetermined amount to the right and forward from the stop operating position P0, and the transmission of power toward the threshing section 7 and the cutting section 3 is engaged.

[0186] Furthermore, in this embodiment, the direction of movement of the working clutch lever 23 from the stop operation position P0 to the reverse operation position P3, i.e., the second direction, is the opposite of the direction of movement from the first working operation position P1 to the second working operation position P2, i.e., the third direction. In other words, regarding the operating direction of the working clutch lever 23, the third direction is rearward, and its opposite direction, i.e., rearward, is the second direction.

[0187] Next, use Figure 16 as well as Figure 17 The linkage mechanism 300, which includes the operating line 145, will be described below. Figure 16 as well as Figure 17 As shown, the linkage mechanism 300 includes: a rod support rotating plate 310 as a first linkage member, which supports the base of the working clutch rod 23; and a rotating arm body 320 as a second linkage member, which receives the engagement of the rod support rotating plate 310 and receives the connection of the other end of the operating line 145.

[0188] The rod support rotating plate 310 has a plate-shaped portion, namely plate section 311, that is, a plate with a generally mountain-shaped profile. Plate section 311 is supported by a shaft support portion 312 with the left-right direction being the plate thickness direction, allowing it to rotate about a first rotation axis S1 along the left-right direction. Shaft support portion 312 is a portion forming a cylindrical shape with the left-right direction being the cylindrical axis direction, and is provided in a through-type manner relative to plate section 311 at the upper part (the top of the generally mountain-shaped profile). Shaft support portion 312 is supported at a predetermined position relative to a predetermined frame member disposed within the rod column 24. Thus, the rod support rotating plate 310 is configured to rotate about the first rotation axis S1 from a fixed position within the rod column 24.

[0189] The lever support rotating plate 310 rotatably supports the base of the working clutch lever 23 to the plate portion 311. The rod-shaped main body portion 23a, which has a predetermined shape, has a supported portion 23c that bends forward in a downwardly extending portion from the lever guide portion 150. The supported portion 23c is the portion that extends in a generally front-to-back direction and constitutes the base of the working clutch lever 23.

[0190] On the lower part of the right side of the plate 311, along the bottom edge of the plate 311 which is roughly mountain-shaped, there is a supported portion 23c of the working clutch lever 23. The supported portion 23c is supported by an annular or cylindrical shaft support member 313 fixed to the plate 311, so that it can rotate at a predetermined position with a second rotation axis S2 that is aligned with the central axis of the supported portion 23c.

[0191] Thus, the working clutch lever 23 is supported by the lever support rotating plate 310 such that it can rotate about a first rotation axis S1 in the left-right direction in the front-back direction, and can also rotate about a second rotation axis S2 in the left-right direction when viewed from above. Furthermore, in relation to the operating movement path of the working clutch lever 23 described above, during movement along the second movement path 162 and the third movement path 163 in the front-back direction, the working clutch lever 23 rotates in the front-back direction; during movement along the first movement path 161 in the left-right direction, the working clutch lever 23 rotates in the left-right direction (see reference...). Figure 14 ).

[0192] The rotating arm 320 includes: a support shaft portion 323 that rotates about a third rotation axis S3 in the left-right direction; a first arm 321 that extends rearward from one side (right side) of the support shaft portion 323 along its axial direction; and a second arm 322 that extends downward from the other side (left side) of the support shaft portion 323 along its axial direction. The first arm 321 and the second arm 322 are integrally connected to each other via the support shaft portion 323 and, when viewed from the side with respect to the third rotation axis S3 along its axial direction, are approximately "L"-shaped and rotate integrally about the third rotation axis S3. The support shaft portion 323 is supported at a predetermined position relative to a predetermined frame member disposed within the rod post 24. Thus, the rotating arm 320 is configured to rotate about the third rotation axis S3 from a fixed position within the rod post 24.

[0193] The first arm 321 is a long-side plate-shaped component, and is fixedly mounted to the right end of the support shaft portion 323 with the left-right direction aligned with the thickness direction of the plate. An elongated hole 321a is formed at the rear of the first arm 321 along its long side. A rod-shaped locking pin 314, protruding to the right from the lower front part of the plate portion 311, passes through the elongated hole 321a. The locking pin 314 is fixedly mounted to the plate portion 311 and rotates integrally with it.

[0194] In this way, the rotating arm 320 engages with the rod support rotating plate 310 by having the engaging pin 314 pass through the elongated hole 321a of the first arm 321. Furthermore, the engaging portion formed by the elongated hole 321a and the engaging pin 314 maintains the engagement state between the rod support rotating plate 310 and the rotating arm 320, and allows the engaging pin 314 to move relative to the first arm 321 as the plate 311 and the first arm 321 rotate. The elongated hole 321a guides the direction of the relative movement of the engaging pin 314 relative to the first arm 321 towards the long side direction of the first arm 321.

[0195] The second arm 322 is a long-sided plate-shaped component, fixedly mounted to the left end of the support shaft portion 323 with the left-right direction aligned with the thickness direction of the plate. The other end of the operation line 145 is connected to the middle portion of the second arm 322. A rod-shaped connecting member 324 is provided at the other end of the operation line 145. On the other hand, a rod-shaped connecting pin 325 is provided in the middle portion of the second arm 322, protruding to the left. The connecting pin 325 passes through the tip of the connecting member 324. The connecting member 324 is locked and supported by the connecting pin 325 by a locking pin passing through the tip of the connecting pin 325 through which the connecting member 324 passes. Thus, the other end of the operation line 145 is connected to the second arm 322 of the rotating arm body 320.

[0196] Furthermore, the other end of the operating line 145 extends horizontally from the connection end relative to the second arm 322 towards the rear, and is supported by a support plate 332 on a line support post 331 disposed within the rod post 24. The support plate 332 is a bent plate-shaped component that appears approximately "U"-shaped when viewed from the side, and is fixed to the line support post 331 by welding or the like, with its approximately "U"-shaped bottom surface facing forward. Additionally, a line support member 333 is provided at the other end of the covering tube 149 covering the operating line 145, through which the operating line 145 and the covering tube 149 pass. The line support member 333 is fixed to the support plate 332 in a form that penetrates the front surface portion of the support plate 332.

[0197] Thus, the portion at the other end of the operating line 145 is supported horizontally in a generally front-to-back direction, so that the directionality of the operating force (tension force) applied to the operating line 145 can be defined, and the operating force can be stably applied to the operating line 145. Specifically, the protruding portion of the operating line 145 extending forward from the line support member 333 is slightly inclined to the left-forward (see reference). Figure 17 By utilizing the connection structure of the operating line 145 relative to the rotating arm 320, the second arm 322 moves forward as the rotating arm 320 rotates around the third rotating axis S3, thereby stretching the operating line 145 forward from its other end.

[0198] Reference Figure 16 When the working clutch lever 23 is in the stop operation position P0, the first working operation position P1, the second working operation position P2, etc., except for the reverse operation position P3 (refer to...). Figure 14 , Figure 15In cases (a) to (c), the linkage mechanism 300 (equivalent to the rotation limiting linkage mechanism) applies a stretching force to the operating line 145, and the reversing mechanism 110 (equivalent to the rotation limiting part) is in a non-operating state. On the other hand, when the operating clutch lever 23 is moved from the stop operating position P0 to the reversing operating position P3 (see reference...), Figure 14 , Figure 15 When the (d) is moved, as the rotating arm 320 rotates around the third rotating axis S3, the linkage mechanism 300 (equivalent to the rotation limiting linkage mechanism) moves the second arm 322 to the rear, releasing the tension of the operating line 145 and switching the reversing mechanism 110 to the working state. In this way, by operating the working clutch lever 23 towards the reversing operating position P3, the reversing mechanism 110 can be switched to the working state by using the linkage mechanism 300, thereby limiting the rotation of the conveyor 36 (cutting input shaft 38) in the forward direction and keeping the conveyor 36 (cutting input shaft 38) in a restricted state.

[0199] When the reversing mechanism 110 is switched to the working state (the cutting input shaft 38 is switched to the restricted state), and the working clutch lever 23 is in the second working position P2, there is a possibility that the operator may move the working clutch lever 23 from the second working position P2 to the reversing position P3. In this case, if the time it takes for the operator to move the working clutch lever 23 from the second working position P2 to the reversing position P3 is short, the following adverse situation may occur.

[0200] When the operating clutch lever 23 is in the second operating position P2, the cutting section 3 and the threshing section 7 are in operation. Therefore, the conveyor 36 of the feeding section 30 in the cutting section 3 is facing the forward rotation direction (see reference). Figure 6 Arrow B2) drives rotation. On the other hand, when the working clutch lever 23 is in the reverse operation position P3, the reverse mechanism 110 is in the working state, so, as Figure 9 as well as Figure 10 As shown, the gear 120 on the cutting input shaft 38 side and the claw component 130 on the feeding chamber 35 side are engaged, and the conveyor 36 (cutting input shaft 38) is in a restricted state where rotation in the forward direction is limited. Therefore, when the operating time of the working clutch lever 23 is shortened, the cutting input shaft 38 may still be rotating due to inertia, causing the claw component 130 to engage with the gear 120, which rotates integrally with the cutting input shaft 38, potentially resulting in damage to the gear 120, the claw component 130, or the first to fourth gears 211 to 214.

[0201] Therefore, the combine harvester 1 according to this embodiment includes a restraining unit 500, which restrains the conveyor 36 into a restricted state until a predetermined condition is met. Here, the predetermined condition refers to the condition under which the rotation of the cutting input shaft 38 stops, thereby stopping the rotation of the conveyor 36 in the forward direction. Figures 18-20 This section explains the 500-unit restraint unit. Incidentally, in... Figures 18-20 In the middle, the right view shows the connecting mechanism 300 or the restraint part 500 and other components. The right side of the figure is the front side, and the left side is the rear side.

[0202] The restraint unit 500 is configured to maintain the original components of the linkage mechanism 300 while switching between a restrained state that restrains the conveyor 36 to a restricted state and a restrained-release state that releases the restraint. In this way, the restraint unit 500 remains functional. Figure 16 The rod support rotating plate 310 or rotating arm body 320 shown are components, therefore, in Figures 18-20 In the middle, the mark and Figure 16 The same symbols are used, therefore detailed descriptions of structures such as the rod support rotating plate 310 or the rotating arm body 320 are omitted. Incidentally, in Figures 18-20 In order to facilitate understanding of the structure of the restraint unit 500, switches such as the threshing switch 401 and supporting components are omitted. Additionally, in... Figures 18-20 In the diagram, regarding the working clutch lever 23, it is shown that the cylindrical portion 23d covers the area around the supported portion 23c.

[0203] like Figure 18 As shown, the combine harvester 1 includes a parking brake mechanism 600 (equivalent to a body movement limiting part) that restricts the movement of the traveling body 2, and a restraining part 500 configured to switch between a working state and a non-working state with the parking brake mechanism 600, and to switch between a restraining state and a restraining release state.

[0204] First, the parking brake mechanism 600 will be described. The parking brake mechanism 600 restricts the movement of the vehicle body 2 by being in an active state, and releases the restriction on the movement of the vehicle body 2 by being in a de-active state. The parking brake mechanism 600 includes: a parking brake pedal 601 (equivalent to a vehicle movement restriction operation unit) that can be stepped on by an operator, etc., and a parking brake that can switch between an active state and a de-active state according to the operating position of the parking brake pedal 601.

[0205] Although the parking brake is not shown in the diagram, for example, it is equipped on transmission 65 (see reference). Figure 4The transmission 65 outputs driving force to rotate the drive sprocket 5a of the track section 5. The parking brake is configured to restrict the output of driving force from the transmission 65 by limiting the rotation of the output shaft of the transmission 65, thereby enabling a switch to a state that restricts the movement of the traveling body 2. Incidentally, the parking brake is not limited to being equipped on the transmission 65; any other type of parking brake that can restrict the rotation of the drive sprocket 5a of the track section 5 can be used.

[0206] The parking brake pedal 601 is located on the right side of the front portion of the lever 24. The parking brake pedal 601 is positioned in a non-operating position Q1 (refer to) such that it can rotate about the fifth rotation axis S5, thus deactivating the parking brake mechanism 600. Figure 18 ), and working position Q2 (refer to) that puts the parking brake mechanism 600 into working state. Figure 19 , Figure 20 ).

[0207] The parking brake pedal 601 is restored to the non-operating position Q1 by the force of the elastic body 609 (described later). The configuration is such that when the parking brake pedal 601 is in the non-operating position Q1, the lower end of the parking brake arm 607 (described later) abuts against a stop member (not shown), thereby preventing the parking brake pedal 601 from rising beyond the non-operating position Q1. On the other hand, when the parking brake pedal 601 is rotated to the operating position Q2, as... Figure 19 as well as Figure 20 As shown by the single-dot dashed line, the engaging pin 605 engages with the engaging groove 604 formed in the rotating part 603, thereby positioning and holding the parking brake pedal 601 in the working position Q2. The engaging pin 605 is configured to move freely in the left and right direction from the lever 24 or the like toward the parking brake pedal 601 side. By manually operating the engaging pin 605, the operator or the like can move the engaging pin 605 in the engaging groove 604 of the parking brake pedal 601 when it is rotated to the working position Q2.

[0208] The parking brake pedal 601 includes: a step-in portion 602, which is plate-shaped in the left-right direction along its width and receives step-in operation from the operator; and a rotating portion 603, which is rod-shaped extending from a base end to a tip end, and the base end is supported by a shaft support portion 606 so that it can rotate about a fifth rotation axis S5 in the left-right direction. The step-in portion 602 is fixed to the tip end of the rotating portion 603. The shaft support portion 606 is cylindrical in the left-right direction and is supported so that it can rotate freely in a fixed position relative to a predetermined frame member provided in the rod post 24. Thus, the parking brake pedal 601 and the shaft support portion 606 can rotate integrally about the fifth rotation axis S5.

[0209] The parking brake mechanism 600 includes: a parking brake arm 607, which rotates around a fifth rotation axis S5 in order to associate the action of the parking brake pedal 601 with the action of the parking brake equipped on the transmission 65; and a parking brake operating part 608, which performs switching operation of the parking brake between an operating state and a non-operating state in conjunction with the rotation of the parking brake arm 607.

[0210] The parking brake arm 607 is fixed to the shaft support 606 and is formed as a plate extending along the front side. It rotates integrally with the shaft support 606 and the parking brake pedal 601 around the fifth rotation axis S5. Although not shown in the figure, the parking brake operation part 608 has, for example, an operation line built in, and is configured such that the operation line can be operated in conjunction with the rotation of the parking brake arm 607, thereby enabling the switching operation between the working state and the non-working state of the parking brake.

[0211] The tip of the parking brake arm 607 is connected to the parking brake operating part 608, and is configured such that rotation of the parking brake arm 607 switches the parking brake operating part 608 between an upward-moving operation state and a downward-moving operation state. When the parking brake operating part 608 is in the upward-moving operation state, the parking brake is in a non-operating state; when the parking brake operating part 608 is in the downward-moving operation state, the parking brake is in an operating state. It includes an elastic body (e.g., a spring) 609 that applies force to the parking brake operating part 608 in the upward direction. The force of the elastic body 609 returns the parking brake operating part 608 to the upward-moving operation state. One end of the elastic body 609 is hooked to a predetermined frame member provided within the rod post 24, and the other end of the elastic body 609 is hooked to the tip of the parking brake operating part 608.

[0212] like Figure 18 As shown, when the parking brake pedal 601 is in a non-operating position Q1, which is tilted towards the front and then towards the top, the parking brake arm 607, which rotates integrally with the parking brake pedal 601, moves the parking brake operating part 608 towards the top, and the parking brake of the transmission 65 is switched to a non-operating state, and the parking brake mechanism 600 is switched to a non-operating state.

[0213] When the operator, etc., depresses the parking brake pedal 601, such as Figure 19 as well as Figure 20 As shown, the parking brake pedal 601 rotates around the fifth rotating axis S5, and is located at: Figure 18 The tilted position is moved to the lower working position Q2, and the parking brake arm 607, which rotates integrally with the parking brake pedal 601, is switched to the state of moving downward. The parking brake of the transmission 65 is switched to the working state, and the parking brake mechanism 600 is switched to the working state.

[0214] The restraint unit 500 is configured to restrain the movement of the linkage mechanism 300 until a predetermined condition is met, and to restrain the movement of the working clutch lever 23 toward the reverse operating position P3, thereby restraining the mechanism 110 into the working state (the conveyor 36 into the restricted state). The restraint unit 500 can move in conjunction with the rotation of the parking brake pedal 601 in the parking brake mechanism 600. Figure 18 When the parking brake pedal 601 is in the non-operating position Q1 as shown, the restraint unit 500 is switched to the restraint state, as shown. Figure 19 When the parking brake pedal 601 is in the working position Q2 as shown, the restraint unit 500 is switched to the restraint release state.

[0215] The restraint part 500 has the following characteristics: the further it is towards the upper side, the further it is towards the rear side. Figures 18-20 The first link 501, extending from the left side in a tilted posture with a lower front and higher rear, and fixed to the shaft support 606 and facing forward ( Figures 18-20The second link 502 extends from the right side (center). Both the first link 501 and the second link 502 are plate-shaped with their thickness along the left-right direction. The lower end of the first link 501 and one end of the second link 502 are pivotally connected, allowing free rotation about a first pivot support axis R1 along the left-right direction. Accordingly, the second link 502 rotates integrally with the parking brake pedal 601 and the shaft support 606 around the fifth rotation axis S5, and the first link 501 rotates about the first pivot support axis R1 relative to the second link 502, which rotates integrally with the parking brake pedal 601 and the shaft support 606. Therefore, the first link 501 and the second link 502 are configured to move in conjunction with the movement of the parking brake pedal 601.

[0216] Here, the parking brake pedal 601, the parking brake arm 607, and the second link 502 are fixed to the shaft support 606. However, it is also possible to arrange them in the following order: parking brake pedal 601, second link 502, and parking brake arm 607, starting from the right side in the left-right direction. Accordingly, when the shaft support 606 rotates around the fifth rotation axis S5, the parking brake pedal 601, the second link 502, and the parking brake arm 607 rotate as a whole.

[0217] An obliquely shaped elongated hole 503, which is lower at the front and higher at the rear, is formed at the upper end of the first link 501. A locking pin 314, protruding from the plate portion 311, engages with the elongated hole 503 of the first link 501 in a through-hole state. Additionally, an obliquely shaped second abutment portion 505 is formed on the first link 501, extending forward from near the lower end of the portion forming the elongated hole 503. An obliquely shaped first abutment portion 504, which is lower at the front and higher at the rear, extends forward from the protruding end of the second abutment portion 505 towards the lower side. The first abutment portion 504 of the first link 501 is configured such that... Figure 18 When the parking brake pedal 601 is in the non-operating position Q1 as shown, it can abut against the support shaft 323 of the rotating arm 320 (first arm 321 and second arm 322) as the operating clutch lever 23 rotates. The second abutment portion 505 of the first link 501 is configured such that, as shown... Figure 20 When the working clutch lever 23 is in the reverse operation position P3 as shown, it can abut against the support shaft 323 of the rotating arm body 320 (first arm 321 and second arm 322) when the parking brake pedal 601 is switched from the working position Q2 to the non-working position Q1.

[0218] In such Figure 18 As shown, the clutch lever 23 is in the stop operation position P0 (refer to...). Figure 14 When the parking brake pedal 601 is in the non-operating position Q1, the engaging pin 314 is located at the lower end of the elongated hole 503 of the first link 501, and the first abutting part 504 of the first link 501 can abut against the support shaft 323 of the rotating arm 320 (first arm 321 and second arm 322) from the rear lower side. Accordingly, even if the first link 501 wants to move forward and upward, the movement of the first link 501 towards the forward and upward side can be restrained by the abutting part 504 against the support shaft 323. At this time, when the operator wants to operate the working clutch lever 23 towards the reverse operation position P3, the plate part 311 wants to rotate about the first rotating shaft S1 in the left-hand direction (counterclockwise direction) when viewed from the right. However, since the movement of the first link 501 towards the forward and upward side is restrained, the engagement of the engagement pin 314 of the plate portion 311 with the elongated hole portion 503 of the first link 501 restrains the rotation of the plate portion 311 about the first rotation axis S1 in the left-hand direction (counterclockwise direction) when viewed from the right, thereby restraining the movement of the working clutch lever 23 towards the reverse operation position P3. In this way, the restraining part 500 restrains the movement of the working clutch lever 23 towards the reverse operation position P3 by restraining the movement of the link mechanism 300 (plate portion 311), thereby restraining the reverse mechanism 110 from entering the working state (the conveyor 36 from entering the restricted state).

[0219] Incidentally, such as Figure 18 As shown, the movement of the first connecting rod 501 towards the forward and upward side is restrained by the contact of the first abutting part 504 with the support shaft part 323; however, the movement of the first connecting rod 501 towards the rearward and downward side is not restrained. Accordingly, in Figure 18 In the shown state, it is permissible to move the working clutch lever 23 from the stop operation position P0 toward the first working operation position P1 and the second working operation position P2. Therefore, when the parking brake pedal 601 is in the non-operating position Q, without being restrained by the restraint unit 500, the working clutch lever 23 can be operated toward the first working operation position P1 or the second working operation position P2, thereby enabling the threshing unit 7 or the cutting unit 3 to operate.

[0220] exist Figure 18 In the state shown, when the operator or others depress the parking brake pedal 601, as follows: Figure 19As shown, the parking brake pedal 601 moves toward the working position Q2. In conjunction with the movement of the parking brake pedal 601, the second link 502 and the first link 501 move. The engaging pin 314 moves from the middle of the elongated hole 503 of the first link 501 to the upper part, and the first abutment portion 504 of the first link 501 moves to a position where it moves away from the support shaft portion 323 of the rotating arm body 320 (first arm 321 and second arm 322) towards the lower side. This allows the first link 501 to move forward and upward without restriction. Accordingly, the plate portion 311 is allowed to rotate about the first rotating shaft S1 in a counter-clockwise direction when viewed from the right, and the operator can operate the working clutch lever 23 toward the reverse operation position P3, thus enabling the reverse mechanism 110 to operate (the conveyor 36 is in a restricted state). Thus, as the parking brake pedal 601 moves toward the working position Q2, the restraint unit 500 is switched to the restraint release state when the specified conditions are met. The specified conditions include: the parking brake mechanism 600 is in the working state.

[0221] As mentioned above, Figure 18 As shown, when the parking brake mechanism 600 is switched to the non-operating state, the restraint unit 500 restricts the movement of the operating clutch lever 23, thereby restricting the operation of the reversing mechanism 110 via the linkage mechanism 300, and thus restricting the conveyor 36 (cutting input shaft 38) to a restricted state. Additionally, as... Figure 19 As shown, the restraint unit 500 switches the parking brake mechanism 600 to the working state by using the parking brake pedal 601, allowing the working clutch lever 23 to move. This enables the reversing mechanism 110 to operate via the linkage mechanism 300, thereby restricting the conveyor 36 (cutting input shaft 38). Thus, when the restraint unit 500 or the linkage mechanism 300 is configured, the structure can be simplified even without other operating parts by utilizing the following two actions: the operation of the working clutch lever 23, which operates to switch the power to and from the cutting section 3 and the threshing section 7, including the conveyor 36, and the operation of the parking brake pedal 601, which operates the parking brake mechanism 600 between the working state and the non-working state.

[0222] exist Figure 19 In the state shown, when the operator moves the working clutch lever 23 toward the reverse operation position P3, as shown... Figure 20As shown, plate portion 311 rotates counterclockwise (to the left) about the center of the first rotation axis S1 when viewed from the right. Engaging pin 314 moves toward the upper end of the elongated hole portion 503 of the first connecting rod 501, causing the first connecting rod 501 to move forward and upward around the first pivot support axis R1. This results in the second abutment portion 505 of the first connecting rod 501 being positioned opposite the support axis portion 323 of the rotating arm body 320 (first arm 321 and second arm 322) from the lower front side. Therefore, even if the first connecting rod 501 wishes to move backward and upward, the second abutment portion 505 abutting against the support axis portion 323 restricts its movement. At this time, when the operator intends to move the parking brake pedal 601 to the non-operating position Q1, the first connecting rod 501 wishes to move backward and upward with the aid of the second connecting rod 502. However, because the movement of the first link 501 toward the rearward and upward side is restricted, the movement of the parking brake pedal 601 toward the non-operating position Q1 is also restricted. Thus, the movement of the first link 501 of the restraint unit 500 is restricted by the rotating arm 320 of the linkage mechanism 300, preventing the parking brake mechanism 600 from switching from an operating state to a non-operating state.

[0223] exist Figure 20 In the state shown, when the operator moves the working clutch lever 23 toward the stop operation position P0, as follows: Figure 19 As shown, plate portion 311 rotates clockwise (to the right when viewed from the right) around the first rotation axis S1. Engaging pin 314 moves toward the middle of the elongated hole portion 503 of the first connecting rod 501, causing the first connecting rod 501 to move rearward and downward around the first pivot support axis R1. The second abutment portion 505 of the first connecting rod 501 moves to a position where it is not opposed to the support axis portion 323 of the rotating arm body 320 (first arm 321 and second arm 322) and is disengaged from the support axis portion 323. This allows the movement of the first connecting rod 501 rearward and upward to be unrestricted, enabling the operator to move the parking brake pedal 601 to a non-operating position. The tilt angle of the second abutment portion 505 can be appropriately changed; for example, by increasing the tilt angle (lower at the front and higher at the rear), the movement of the first connecting rod 501 rearward and downward can be made smoother.

[0224] Alternatively, the second abutment portion 505 may be configured to have a surface that is substantially perpendicular to the direction of movement of the first link 501 when switching the parking brake pedal 601 between the non-operating position Q1 and the operating position Q2. According to this configuration, when the second abutment portion 505 abuts against the support shaft portion 323, in the event of switching the parking brake pedal 601 from the operating position Q2 to the non-operating position Q1, the surface perpendicular to the direction of movement of the first link 501 abuts against the support shaft portion 323, thereby more reliably preventing the parking brake mechanism 600 from switching from the operating state to the non-operating state.

[0225] Multiple switches are provided for the working clutch lever 23 that actuates the linkage mechanism 300. These switches operate through the action of predetermined components that are linked to the operation of the working clutch lever 23. The multiple switches include: a threshing switch 401, a cutting switch 402, and a reversing switch 403. These switches function as detection units for detecting the operating position of the working clutch lever 23, such as... Figure 21 As shown, these switches are connected to the controller 400, which is part of the control unit of the combine harvester 1. Additionally, an engine start permit switch 700 is provided to detect the operating position of the parking brake pedal 601, and the engine start permit switch 700 is also connected to the controller 400.

[0226] The controller 400 has the following structure: a CPU (Central Processing Unit) for performing various calculations or controls is connected via a bus; ROM (read-only memory), RAM (random access memory), and input / output interfaces serve as storage units. The CPU performs calculations based on various programs stored in the ROM, etc. The controller 400 receives input detection signals from the threshing switch 401, the cutting switch 402, and the reversing switch 403, or detection signals from various sensors provided with the combine harvester 1.

[0227] A threshing clutch 57 is connected to the controller 400 via an actuator for the threshing clutch (not shown). The controller 400 controls the operation of the threshing clutch 57 based on a detection signal from the threshing switch 401, by controlling the operation of the actuator for the threshing clutch. Additionally, a cutting clutch 75 is connected to the controller 400 via an actuator for the cutting clutch (not shown). The controller 400 controls the operation of the cutting clutch 75 based on a detection signal from the cutting switch 402, by controlling the operation of the cutting clutch actuator. Furthermore, the detection signal from the reverse switch 403 or the detection signal from the engine start permit switch 700 is used for the engine 25 start / stop control, described later by the controller 400.

[0228] The threshing switch 401 is a detection device used to detect whether the working clutch lever 23 is in a position corresponding to the "on" threshing state, i.e., from the first working operation position P1 to the second working operation position P2. Specifically, by moving the working clutch lever 23 from the stop operation position P0 to the first working operation position P1, the threshing switch 401 becomes the detection on state (see reference). Figure 14 ).

[0229] like Figure 16 as well as Figure 17 As shown, the threshing switch 401 is a push-button switch with a button 401a. When the button 401a is pressed, the threshing switch 401 is in the ON state. The threshing switch 401 is fixedly supported on the left side of the front and rear extension frame 341 with the button 401a side facing rear, by means of a support plate 342 and fasteners such as bolts. The front and rear extension frame 341 is arranged along the front and rear direction within the rod 24 and is located on the left side of the working clutch rod 23 when viewed from above.

[0230] On the other hand, a pressing member 350 is provided on the rear side of the working clutch lever 23. The pressing member 350 is linked to the movement of the working clutch lever 23 to press the button 401a. The pressing member 350 has: a cylindrical shaft support portion 351, the vertical direction of which is the shaft direction; an engaging arm 352, which is provided on the front side of the shaft support portion 351 and engages with the working clutch lever 23; and a pressing arm 353, which extends from the shaft support portion 351 to the left and presses the button 401a.

[0231] The pressing component 350 is configured to coaxially support the shaft support portion 351 on the support column 354 (see reference). Figure 16The clutch lever 23 rotates around a fourth rotating shaft S4. The support column 354 is located within the lever 24 and at the rear of the working clutch lever 23. The fourth rotating shaft S4 runs vertically along the central axis of the cylindrical shaft support 351. The support column 354 is fixed to the rear of the cross frame 344 by welding or the like. The cross frame 344 is mounted within the lever 24 between the front and rear extension frames 341 and a right front and rear extension frame 343 arranged parallel to the front and rear extension frames 341 on the right side. The engaging arm 352 and the pressing arm 353, together with the shaft support 351, form an integral pressing member 350, which rotates around the fourth rotating shaft S4.

[0232] The engagement arm plate 352 is a plate-shaped portion with its thickness along the vertical direction, and has a recess 352a that branches into two forks on the front side and has the front side as an open side. The pressing member 350 engages with the working clutch lever 23 by positioning the lever body portion 23a within the recess 352a of the engagement arm plate 352.

[0233] The pressing arm 353 is a plate-shaped portion whose thickness is roughly along the front-to-back direction, and is configured such that the tip of the pressing arm 353 is located in front of the button 401a. The plate surface 353a on the front side of the pressing arm 353 is the pressing surface, and the plate surface 353a presses the button 401a.

[0234] With this structure, the left-right rotation of the working clutch lever 23 centered on the second rotation axis S2 is transmitted via the engaging arm 352 as the left-right rotation of the pressing member 350 centered on the fourth rotation axis S4. The forward-backward movement of the pressing arm 353 caused by the rotation of the pressing member 350 switches the threshing switch 401 on / off. That is, by moving the working clutch lever 23 from the stop operation position P0 towards the first working operation position P1 to the right, the pressing member 350 rotates clockwise (to the right when viewed from above), and simultaneously, the pressing arm 353 moves forward to press the button 401a, thus activating the threshing switch 401. This activated state of the threshing switch 401 can also be maintained by moving the working clutch lever 23 from the first working operation position P1 to the second working operation position P2. On the other hand, as the pressing member 350 rotates, the pressing arm 353 releases the pressing action of the button 401a, causing the threshing switch 401 to be in the off state.

[0235] The cutting switch 402 is a detection device used to detect whether the working clutch lever 23 is in the position corresponding to the cutting "on", that is, the second working operation position P2. Specifically, the cutting switch 402 detects whether the working clutch lever 23 moves from the first working operation position P1 to the second working operation position P2.

[0236] like Figure 16 As shown, the cut-off switch 402 is a lever switch having a rotating rod 402a that rotates around a predetermined rotation axis. The cut-off switch 402 is switched on by rotating the rotating rod 402a a predetermined amount from the off state. The cut-off switch 402 is fixedly supported at a predetermined position on a switch support plate 345 using bolts or other fasteners, with the rotating rod 402a protruding upwards and the rotation axis of the rotating rod 402a pointing left-right. This switch support plate 345 is horizontally positioned within the rod post 24 and below the rod support rotating plate 310.

[0237] On the other hand, a first lever operating arm 371 is provided on the plate portion 311. The first lever operating arm 371 is a rod-shaped portion formed by bending in an L-shape, which is fixed to the front end of the plate portion 311 by welding or the like and extends downward. The extended protruding end of the first lever operating arm 371 has a horizontal axis portion 371a that bends to the left and keeps the rod axis along the left-right direction. The first lever operating arm 371 positions its horizontal axis portion 371a in front of the rotating rod 402a of the cut switch 402.

[0238] With this structure, the working clutch lever 23 rotates in the front-to-back direction around the first rotating shaft S1, causing the lever support rotating plate 310 to rotate. Simultaneously, the first lever operating arm 371 moves back and forth, thereby switching the cut-off switch 402 on / off. That is, by moving the working clutch lever 23 forward from the first working position P1 to the second working position P2, the plate portion 311 rotates clockwise in a right-viewing direction. Simultaneously, the horizontal axis portion 371a of the first lever operating arm 371 moves rearward, pressing the rotating lever 402a and causing it to rotate rearward, thus turning the cut-off switch 402 on. On the other hand, by returning the working clutch lever 23 from the second working position P2 to the first working position P1, the pressing action of the first lever operating arm 371 on the rotating lever 402a is released as the lever support rotating plate 310 rotates, thereby making the cut-off switch 402 open.

[0239] The reversing switch 403 is a detection device used to detect whether the working clutch lever 23 is in the position corresponding to the cutting reversal "on", that is, the reversing operation position P3. Specifically, the reversing switch 403 detects whether the working clutch lever 23 moves from the stop operation position P0 to the reversing operation position P3.

[0240] The reversing switch 403 is the same as the cutting switch 402, and is a lever switch having a rotating rod 403a that rotates around a predetermined rotating axis. The reversing switch 403 is switched on when the rotating rod 403a moves a predetermined amount from the off state. The reversing switch 403 is fixedly supported by bolts or other fasteners to a predetermined support member provided within the rod post 24, with the rotating rod 403a protruding upwards and its rotation axis pointing left-right.

[0241] On the other hand, a second lever operating arm 372 is provided on the second arm 322. The second lever operating arm 372 is a rod-shaped portion formed by bending in an L-shape, which is fixed by welding or the like to the lower side of the bent portion 322a located at the lower end of the second arm 322 and facing to the left, and extends downward. The extended protruding end of the second lever operating arm 372 has a transverse axis portion 372a that bends to the right and keeps the rod axis along the left-right direction. The second lever operating arm 372 positions its transverse axis portion 372a in front of the rotating rod 403a of the reversing switch 403.

[0242] With this structure, the working clutch lever 23 rotates in the front-to-back direction around the first rotating shaft S1, and the rotating arm 320 rotates with the help of the lever support rotating plate 310. Simultaneously, the second lever operating arm 372 moves back and forth, thereby switching the reversing switch 403 on / off. That is, by moving the working clutch lever 23 rearward from the stop operating position P0 towards the reversing operating position P3, the plate portion 311 rotates counterclockwise in the left-hand direction when viewed from the right. In conjunction with this, the rotating arm 320 rotates clockwise in the right-hand direction when viewed from the right. Simultaneously, the horizontal axis portion 372a of the second lever operating arm 372 moves rearward, pressing the rotating lever 403a and causing it to rotate rearward, thus turning the reversing switch 403 on. On the other hand, by returning the working clutch lever 23 from the reverse operation position P3 to the stop operation position P0, the pressing action of the second lever operating arm 37 on the rotating lever 403a is released as the lever support rotating plate 310 and the rotating arm body 320 rotate, and the reverse switch 403 becomes the open state.

[0243] In addition, such as Figure 19 as well as Figure 20As shown, an engine start authorization switch 700 is included, which is used to detect whether the parking brake pedal 601 is in the working position Q2. The engine start authorization switch 700 is also used to detect whether the parking brake pedal 601 moves from the non-working position Q1 to the working position Q2.

[0244] like Figure 18 As shown, the engine start permit switch 700 is the same as the threshing switch 401, and is a push-button switch with a button 701a, which is turned on when the button 701a is pressed. The engine start permit switch 700 is fixedly supported in a predetermined position with the button 701a side facing down, by a predetermined support member provided in the rod 24.

[0245] On the other hand, a pressing member 610 is provided on the rear side of the parking brake arm 607. The pressing member 610 is linked with the rotation of the parking brake arm 607 in a clockwise direction (right rotation direction) centered on the fifth rotation axis S5, and presses the button 701a.

[0246] With this structure, when the parking brake pedal 601 rotates around the fifth rotation axis S5, the parking brake arm 607 also rotates around the fifth rotation axis S5 in conjunction with this rotation. Through the rotation of the parking brake arm 607, the pressing member 610 moves vertically, thereby switching the engine start permit switch 700 on / off. That is, by moving the parking brake pedal 601 from the non-operating position Q1 (refer to...)... Figure 18 Oriented towards work position Q2 (refer to) Figure 19 When the step is engaged, the pressing component 350 moves upward to press the button 701a, thereby turning on the engine start permission switch 700.

[0247] use Figure 15 , Figure 18 , Figure 19 , Figure 20 , Figure 22 , Figure 23 An example of the operating mode of a combine harvester 1 with the above-described structure will be explained.

[0248] First, the neutral state of the working clutch lever 23 in the stop operation position P0 will be explained. In this state, as... Figure 15 of (a), Figure 22As shown in (b), the operating clutch lever 23 is in a neutral position in the longitudinal direction and on the left side in the lateral direction, with the threshing switch 401, the cutting switch 402, and the reversing switch 403 all in the off state. That is, in this neutral state, the following conditions are met: the pressing arm 353 does not activate the threshing switch 401, the first lever operating arm 371 does not activate the cutting switch 402, and the second lever operating arm 372 does not activate the reversing switch 403.

[0249] In addition, in this neutral state, such as Figure 23 As shown in (b), the reversing mechanism 110 is in a non-operating state, and the pawl component 130 is in a non-engaged position. The pawl component 130 is kept in the non-engaged position by a stretching action as described below: the operating line 145 is stretched by the rotating arm 320, which is in a predetermined rotational position corresponding to the operating clutch lever 23 which is held in a neutral position in the longitudinal direction, and supported by the lever-supported rotating plate 310. Furthermore, the operating clutch lever 23 can be kept in each operating position by utilizing appropriate structures such as the connection support structure of each component in the linkage mechanism 300 or a separately provided predetermined holding structure.

[0250] When starting work from a neutral state, such as Figure 15 As shown in (b), the working clutch lever 23 is moved to the right from the stop operation position P0 toward the first working operation position P1 (refer to arrow X1). Accordingly, the pressing member 350 engaged with the working clutch lever 23 rotates about the fourth rotation axis S4 in a clockwise direction when viewed from above (refer to...). Figure 17 Using the arrow M1 in the diagram, the button 401a of the threshing switch 401 is pressed by pressing the arm plate 353, thus turning the threshing switch 401 into the on state. Based on this, the working clutch lever 23 is detected to be in the first working operation position P1.

[0251] When the detection signal from the threshing switch 401 is input to the controller 400, the controller 400 sends a control signal to the actuator of the threshing clutch 57 to put it into the "on" state. As a result, the threshing clutch 57 is engaged, the threshing unit 7 starts to operate, and the threshing cylinder 41 and the like begin to rotate.

[0252] Furthermore, when the working clutch lever 23 is in the first working operation position P1, the reversing mechanism 110 is in a non-working state, similar to the neutral state (see reference). Figure 23 (b) This is based on the fact that even when the working clutch lever 23 is in either the stop operation position P0 or the first working operation position P1, the working clutch lever 23 is in a neutral position in the forward and backward direction.

[0253] Next, as Figure 15 As shown in (c), the operating clutch lever 23 is moved forward from the first operating position P1 toward the second operating position P2 (refer to arrow X2). Accordingly, the lever support rotating plate 310 rotates about the first rotating axis S1 in a right-hand direction when viewed from the right (refer to...). Figure 22 (c) Arrow M2), the first lever operating arm 371 is used to press the rotating lever 402a of the cutting switch 402 to rotate it, thereby turning the cutting switch 402 into the on state. Accordingly, the working clutch lever 23 is detected to be in the second working operation position P2. Here, between the first working operation position P1 and the second working operation position P2, the left and right position of the working clutch lever 23 is fixed, so while maintaining the rotating position of the pressing member 350 that turns the threshing switch 401 into the on state, the working clutch lever 23 can be allowed to move forward by using the recess 352a of the engaging arm plate 352.

[0254] When the detection signal from the cutting switch 402 is input to the controller 400, the controller 400 sends a control signal to the actuator of the cutting clutch to put the cutting clutch 75 into an "on" state. Accordingly, with the threshing section 7 operating, the cutting clutch 75 is engaged, the cutting section 3 begins to operate, and the conveyor 36 or the rake auger 37 of the feeding section 30 begins to rotate. Thus, the combine harvester 1 enters an operating state, capable of performing cutting operations in the cutting section 3 or threshing operations in the threshing section 7.

[0255] Furthermore, when operating with the combine harvester 1, in cases where stalks become blocked in the feeding section 30, such as... Figure 15 As shown in (d), the operating clutch lever 23 is moved from the second operating position P2 toward the reverse operating position P3. Accordingly, the operation of the cutting section 3 and the threshing section 7 stops, and the reverse mechanism 110 becomes operational.

[0256] Here, the working clutch lever 23 moves along a crank-shaped path formed by the second movement path 162, the first movement path 161, and the third movement path 163, via the first working operation position P1 and the stop operation position P0. Specifically, the working clutch lever 23 moves from the working state of the combine harvester 1 to the reverse operation position P3 through the next three stages of operation.

[0257] That is, the first stage is: operating from the second operation position P2 towards the rear of the first operation position P1 (refer to...). Figure 15(d) Arrow X3), in the first stage, the lever support rotating plate 310 is rotated in the left-hand direction when viewed from the right to release the action of the first lever operating arm 371 on the cutting switch 402, thereby disconnecting the cutting switch 402 and putting the cutting clutch 75 into the "disengaged" state. The second stage is: operating to the left from the first operating position P1 towards the stop operating position P0 (refer to...). Figure 15 (d) Arrow X4), in the second stage, the pressing member 350 is rotated in the left-hand direction when viewed from above to release the action of the pressing arm 353 on the threshing switch 401, thereby disconnecting the threshing switch 401 and putting the threshing clutch 57 in the "disengaged" state. The third stage is: operating from the stop operation position P0 to the reverse operation position P3 (refer to...). Figure 15 (d) with arrow X5), in the third stage, the cut reverse is activated.

[0258] Here, when performing the third stage operation from the stop operation position P0 to the reverse operation position P3, as follows: Figure 18 As shown, the restraint part 500 restrains the movement of the working clutch lever 23 toward the reverse operation position P3. Specifically, the first abutment part 504 abuts against the support shaft part 323, restraining the movement of the first connecting rod 501 toward the forward and upward side. Therefore, the rotation of the plate part 311 about the first rotation axis S1 in the left-hand (counterclockwise) direction when viewed from the right is restrained, thereby restraining the movement of the working clutch lever 23 toward the reverse operation position P3. Accordingly, to operate the working clutch lever 23 toward the reverse operation position P3, the restraint of the restraint part 500 needs to be released.

[0259] Therefore, in Figure 18 In the indicated state, the operator, etc., depresses the parking brake pedal 601, and as shown... Figure 19 As shown, the first link 501 moves forward and upward without restriction. Accordingly, the plate 311 is allowed to rotate counter-clockwise (to the left) around the first rotation axis S1, allowing the operator to operate the working clutch lever 23 towards the reverse operation position P3. Thus, when performing the third stage operation from the stop operation position P0 to the reverse operation position P3, the parking brake pedal 601 is moved towards the working position Q2 (see reference...). Figure 19 After the step-in operation has been performed, the third stage operation is carried out from the stop operation position P0 to the reverse operation position P3.

[0260] With the working clutch lever 23 in the neutral state of the stop operation position P0 as a reference, the reversing mechanism 110 is activated by operating the working clutch lever 23 backward from the neutral state. Here, the threshing switch 401 is kept in the open state. That is, the left-right position of the working clutch lever 23 is fixed between the stop operation position P0 and the reversing operation position P3. Therefore, while maintaining the rotational position of the pressing member 350 that keeps the threshing switch 401 in the open state, the working clutch lever 23 can be allowed to move backward via the recess 352a of the engaging arm plate 352.

[0261] The clutch lever 23 is moved from the stop operation position P0 to the reverse operation position P3 via the operating clutch lever 23, such as... Figure 22 As shown in (a), the rod support rotating plate 310 rotates about the first rotation axis S1 in a left-handed direction when viewed from the right (refer to arrow M4). Simultaneously, the first arm 321 is pressed upwards by the engaging pin 314 through the elongated hole 321a, thereby rotating the arm body 320 about the third rotation axis S3 in a right-handed direction when viewed from the right (refer to arrow M5). Accordingly, the operating line 145, stretched by the second arm 322, becomes slack, thus releasing the stretching effect of the operating line 145 that holds the claw component 130 in the non-engaged position on the claw component 130. Therefore, as... Figure 23 As shown in (a), the claw component 130 rotates in the engagement direction and engages with the gear 120 by the force of the spring 140 (refer to arrow M6), thereby making the cutting input shaft 38 engaged with the feeding chamber 35.

[0262] Thus, the linkage mechanism 300 is configured such that, through the travel of the working clutch lever 23 from the stop operating position P0 to the reverse operating position P3, the tension of the operating line 145 on the pawl member 130, which has overcome the force of the spring 140, is released. Conversely, the linkage mechanism 300 is configured such that, through the travel of the working clutch lever 23 from the reverse operating position P3 to the stop operating position P0, the tension of the operating line 145, which is held in place, is achieved by overcoming the force of the spring 140 and moving the pawl member 130 from the engaged position to the disengaged position.

[0263] When the reversing mechanism 110 is in operation, that is, when the cutting input shaft 38 is engaged with the feeding chamber 35, the feeding section 30 rises, the cutting input shaft 38 rotates in the reversing direction, and the conveyor 36 moves in the opposite direction within the feeding section 30. This eliminates blockages of the stalks within the feeding section 30.

[0264] Here, when clearing the blockage of the stalks in the feeding section 30, the upward movement of the feeding section 30 can be performed multiple times as needed by lowering the feeding section 30 again. Furthermore, when the feeding section 30 is lowered while the reversing mechanism 110 is in operation, the ratchet structure of the reversing mechanism 110 allows the feeding chamber 35 to rotate relative to the cutting input shaft 38, thereby preventing or suppressing the cutting input shaft 38 from rotating in the forward direction.

[0265] After the blockage of the stalks in the feeding section 30 is cleared, the combine harvester 1 is put into operation and resumes operation by moving the working clutch lever 23 to the first working operation position P1 and the second working operation position P2.

[0266] like Figure 20 As shown, when the reversing mechanism 110 is in the working state, the second abutment portion 505 abuts against the support shaft portion 323, which can suppress the movement of the first link 501 toward the rearward and upward side. Accordingly, the rotating arm 320 of the linkage mechanism 300 restricts the movement of the first link 501 of the restraining portion 500 by limiting the movement of the parking brake pedal 601 toward the non-working position Q1, thereby preventing the parking brake mechanism 600 from switching from the working state to the non-working state. Accordingly, when the reversing mechanism 110 is in the working state, if the working clutch lever 23 is not operated from the reversing operation position P3 toward the stop operation position P0, it is not necessary to switch the parking brake mechanism 600 from the working state to the non-working state, thus preventing the movement of the traveling body 2 during the operation of clearing the blockage of the stalks in the feeding portion 30.

[0267] In the above-described operating linkage mechanism between the working clutch lever 23 and the reversing mechanism 110, based on the operation of the working clutch lever 23, the linkage mechanism 300 rotates the pawl member 130 of the reversing mechanism 110 in two stages from the engaged position engaged with the gear 120 toward the reverse engagement direction. That is, the pawl member 130 is configured such that, as a non-engaged position, it is in an engaged-disengaged position where engagement with the gear 120 is released, and it can move from this engaged-disengaged position to a retracted position that rotates further toward the reverse engagement direction. Specifically, as described below.

[0268] The four operating positions of the working clutch lever 23 are divided into three positions in the front-rear direction: the reverse operation position P3 is the rear position, the stop operation position P0 and the first working operation position P1 is the neutral position, and the second working operation position P2 is the front position.

[0269] In such Figure 22 As shown in (a), the clutch lever 23 is in the rear position (reverse operation position P3), as... Figure 23 As shown in (a), the claw component 130 is in the engaged position where it engages with the gear 120, while the reversing mechanism 110 is in the working state.

[0270] By operating the working clutch lever 23 from the rear position towards the neutral position (stop operation position P0 or first working operation position P1), such as... Figure 22 As shown in (b), the rod support rotating plate 310 rotates in a right-hand direction when viewed from the right (refer to arrow M7), and in conjunction with this, the rotating arm 320 rotates in a left-hand direction when viewed from the right (refer to arrow M8), and the other end of the operating line 145 is stretched forward (refer to arrow M9). Accordingly, as Figure 23 As shown in (b), the claw component 130 rotates in the opposite engagement direction against the force of the spring 140 and reaches the engagement release position (refer to arrow M10), and the reversing mechanism 110 becomes non-working.

[0271] In addition, such as Figure 22 As shown in (c), by operating the clutch lever 23 from the neutral position, i.e., the first operating position P1, towards the forward position (the second operating position P2), the lever support rotating plate 310 rotates further in the right-hand direction when viewed from the right (refer to arrow M2). Simultaneously, the engaging pin 314, through which the elongated hole 321a passes, presses the first arm 321 downwards, thereby rotating the arm body 320 further in the left-hand direction when viewed from the right (refer to arrow M11). Consequently, the other end of the operating line 145 connected to the second arm 322 is further stretched forward (refer to arrow M12). Accordingly, as... Figure 23 As shown in (c), the pawl component 130 rotates further in the anti-engaging direction against the force of the spring 140 to reach the retracted position (refer to arrow M13). That is, as the clutch 75 is engaged by the operation of the working clutch lever 23, the pawl component 130, which is in the disengaged position, rotates to the retracted position obtained by rotating further in the anti-engaging direction from the disengaged position.

[0272] As described above, the linkage mechanism 300, which links the pawl member 130 of the reversing mechanism 110 with the working clutch lever 23, moves the working clutch lever 23 from the reversing operation position P3 toward the stop operation position P0, causing the pawl member 130 to move to the engagement release position relative to the gear 120, and moves the working clutch lever 23 from the first working operation position P1 toward the second working operation position P2, causing the pawl member 130 to move to a retraction position obtained by moving further from the engagement release position toward the engagement release direction (reverse engagement direction).

[0273] Furthermore, in the combine harvester 1 of this embodiment equipped with the reversing mechanism 110, the controller 400 that controls the starting of the engine 25 controls the starting and stopping of the engine 25 based on the detection signal of the reversing switch 403.

[0274] As described above, the reverse switch 403 can be used to detect that the working clutch lever 23 is in the reverse operating position P3. Therefore, when the detection signal from the reverse switch 403 is input to the controller 400, the controller 400 controls the engine 25 to prevent it from starting. In other words, the controller 400 prevents the engine 25 from starting when it detects that the working clutch lever 23 is in the reverse operating position P3 using the reverse switch 403. An example of a structure used to perform the above control will be described.

[0275] like Figure 21 As shown, the controller 400 is connected to the battery 406 via a power-on start switch 405. The start switch 405 is a rotary switch or push-button switch that can be rotated by inserting a predetermined key into a keyway, and is located, for example, in the steering column in front of the driver's seat 17 in the driver's compartment 15.

[0276] Normally, when the start switch 405 is turned on, current from the battery 406 flows into the coil of the starter relay connected to the starter, and the switch of the starter relay becomes conductive. Accordingly, the engine 25 starts by energizing the battery 406. After the engine 25 starts, the driving state of the engine 25 and the power supply from the battery 406 to various parts are maintained. Furthermore, when the start switch 405 is turned off, the power supply from the battery 406 stops, and the driving of the engine 25 ceases.

[0277] In this configuration, when the controller 400 detects that the working clutch lever 23 is in the reverse operation position P3 based on the detection signal from the reverse switch 403, it can also prevent the engine 25 from starting by turning on the starter switch 405 when the engine 25 is started. That is, the controller 400 controls the current from the battery 406 to prevent it from flowing into the coil of the starter relay, so as to maintain the switch portion of the starter relay in the off state (non-conducting state) when the reverse operation is interrupted. Accordingly, the power supply from the battery 406 to the starter is cut off, and the starter does not operate; as a result, the engine 25 will not start.

[0278] In the start-stop control of the engine 25 based on the detection signal of such a reversing switch 403, for example, a warning buzzer may be sounded, or a warning message such as "Please disconnect the reversing switch to start the engine" may be displayed on a display unit such as an LCD display provided on the driver's unit 15. Accordingly, the operator's attention can be drawn, and the inability to start the engine 25 can be accurately reported.

[0279] Furthermore, when the detection signal of the engine start permit switch 700 is input to the controller 400, the controller 400 controls the engine 25 to prevent it from starting. That is, the controller 400 operates in a manner that prevents the engine 25 from starting when the parking brake pedal 601 is in the non-operating position Q1 (see reference). Figure 18 In the state of (), the engine 25 is not started, and the controller 400 detects that the parking brake pedal 601 is in the working position Q2 (refer to) by using the engine start permission switch 700. Figure 19 The state allows engine 25 to start. Incidentally, the start-stop control of engine 25 based on the detection signal of engine start permission switch 700 can also adopt the same structure as the start-stop control of engine 25 based on the detection signal of reverse switch 403, so its description is omitted.

[0280] Furthermore, in the start-stop control of the engine 25 based on the detection signal of the engine start permission switch 700, for example, a warning buzzer may be sounded, or a warning message such as "Please set the 'parking brake pedal' to the 'operating position' to start the engine" may be displayed on a display unit such as an LCD display device provided on the driver's side 15. This can attract the operator's attention and accurately inform them that the engine 25 cannot be started.

[0281] According to the combine harvester 1 of this embodiment with the structure described above, the structure of the feeding section 30, which conveys / supplies the stalks cut by the cutting section 3 toward the threshing section 7, does not lead to structural complexity. With a simple structure, the conveyor 36 in the feeding section 30 can be made to move in the reverse direction, thereby eliminating the blockage of the stalks in the feeding section 30.

[0282] That is, the combine harvester 1 of this embodiment has the following structure: the cutting input shaft 38 is engaged with the feeding chamber 35 by means of the reversing mechanism 110, thereby forcibly rotating the conveyor 36 in the opposite direction by means of the rising action of the feeding section 30. In other words, it has the following structure: the conveyor 36 is rotated in the opposite direction by means of power independent of the transmission system that drives the working parts such as the cutting section 3 or the threshing section 7.

[0283] Therefore, when comparing the transmission mechanism for reversing the conveyor with a conventional structure installed in the power transmission path from the engine to the cutting section, it is possible to implement a structure for reversing the conveyor 36 in a cost-effective and simple manner without making special changes to the power transmission structure from the engine 25 to the cutting section 3. Furthermore, in the reversing mechanism 110 of this embodiment, the conveyor 36 is reversed by the upward movement of the feeding section 30 based on the lifting cylinder 39. Therefore, it is not necessary to make special changes to the hydraulic device that operates the lifting cylinder 39 in the combine harvester 1, and additional power is not required to reverse the movement of the conveyor 36.

[0284] Furthermore, the feeding unit 30 utilizes the hydraulic pressure of the lifting cylinder 39 for its upward movement. Therefore, the upward movement of the feeding unit 30 can easily generate a greater operating force than its weight-based downward movement. Thus, even when the feeding unit 30 is difficult to raise or lower due to blockages such as stalks within the feeding chamber 35, it can reliably rise, ensuring reliable reversal of the conveyor 36 based on the reversing mechanism 110. Moreover, the upward movement of the feeding unit 30 can be actively performed via the lifting cylinder 39, making motion control easier compared to the weight-based downward movement of the feeding unit 30. This results in excellent operability for the reversing movement of the conveyor 36 based on the reversing mechanism 110.

[0285] Furthermore, the reversing mechanism 110 according to this embodiment can be configured independently of the power transmission path from the engine 25 to the cutting section 3. Therefore, it is not necessary to provide a structure on the power transmission path from the engine 25 to the cutting section 3 to avoid interference between the power transmission for forward / reverse rotation of the conveyor 36. Thus, it is possible to configure a structure for causing the conveyor 36 to move in the opposite direction without making the structure complex or the device structure large.

[0286] Furthermore, the reversing mechanism 110 according to this embodiment is constructed with the following components as its main components: a gear 120 supported on the cutting input shaft 38, and a claw member 130 supported on the feeding chamber 35 and provided on the feeding section 30 side. With such a structure, the reversing mechanism 110 can be implemented with an extremely simple structure, and can be easily installed on the existing structure of the combine harvester 1.

[0287] Furthermore, the reversing mechanism 110 of this embodiment is configured as a ratchet mechanism using a gear 120 and a claw member 130. This ratchet mechanism restricts the lifting and lowering movement of the feed section 30, which rotates the cutting input shaft 38 in the reverse direction, to a rising movement of the feed section 30 while the reversing mechanism 110 is operating. With this structure, when the feed section 30 is lowering while the reversing mechanism 110 is operating, the feed section 30 can rotate relative to the cutting input shaft 38. Therefore, when removing blockages in the feed section 30, by lifting and lowering the feed section 30, and repeatedly causing the conveyor 36 to move in the opposite direction via the rising movement of the feed section 30, the lifting and lowering movement of the feed section 30 can be performed smoothly.

[0288] Furthermore, the combine harvester 1 according to this embodiment includes an amplification mechanism 200, which amplifies the rotation of the gear 120, which rotates in response to the upward movement of the feed unit 30 via the claw member 130, and transmits this amplification to the cutting input shaft 38. With this structure, sufficient rotational amount can be obtained simultaneously with the lifting and lowering movement of the feed unit 30 and the rotation of the cutting input shaft 38 in the opposite direction of the conveyor 36. That is, in cases where the lifting and lowering stroke of the feed unit 30 is limited, insufficient rotational amount can be obtained in the reverse direction of the cutting input shaft 38 to eliminate stalk blockage. However, by including the amplification mechanism 200, the rotational amount of the cutting input shaft 38 caused by the rotation of the gear 120, which rotates as the feed unit 30 rises, can be amplified. Therefore, sufficient rotational amount can be easily obtained in the opposite direction of the conveyor 36, thereby effectively eliminating stalk blockage.

[0289] Furthermore, the amplification mechanism 200 is configured to include: input shaft-side gears (first gear 211 and fourth gear 214) supported on the cutting input shaft 38, an idler shaft 215, and transmission shaft-side gears (second gear 212 and third gear 213) supported on the idler shaft 215 and meshing with the input shaft-side gears. With this structure, the amplification mechanism 200 can be easily constructed using existing structures, and the amplification effect based on the rotational amount of the amplification mechanism 200 can be reliably and easily obtained.

[0290] Furthermore, in this embodiment, the reversing mechanism 110 is positioned in the feed section 30 on the left side, which is the outer left and right side of the machine body, relative to the feed chamber 35. With this configuration, the reversing mechanism 110 is located on the outer left side of the combine harvester 1, thus improving accessibility to the reversing mechanism 110. Consequently, good maintainability of the reversing mechanism 110 can be achieved. Therefore, in cases where, for example, the combine harvester 1 according to this embodiment has a configuration where the feed section 30 of the cab 16 is arranged with the left and right sides reversed, the reversing mechanism 110 is preferably positioned on the right side, which is the outer left and right side of the machine body, relative to the feed chamber 35.

[0291] Furthermore, the combine harvester 1 according to this embodiment is configured such that the operation of the reversing mechanism 110 is operated using a working clutch lever 23 provided in the driver's compartment 15. With this configuration, the operator performing driving operations in the driver's compartment 15 can operate the reversing mechanism 110 without leaving the driver's seat 17, thus achieving good operability when clearing stalk blockages.

[0292] That is, for example, with a structure that additionally provides an operating member for operating the reversing mechanism 110, the operator's operating objects increase, making the operation more complex. Furthermore, with a structure where the operating member for operating the reversing mechanism 110 is located outside the driver's cab 15, for example, between the driver's cab 16 and the feeding section 30, it becomes difficult for the operator to operate the operating member for the reversing mechanism 110 while seated in the driver's seat 17, thus hindering good operability. Therefore, as in the combine harvester 1 of this embodiment, by using the working clutch lever 23 provided in the driver's cab 15 as the operating member for the reversing mechanism 110, the operability of the conveyor 36's reversing operation can be improved.

[0293] Furthermore, by adopting a structure in which the reversing mechanism 110 is operated using the clutch lever 23, the existing operating components provided in the driver's unit 15 can be shared as operating components of the reversing mechanism 110. Therefore, there is no need to provide a separate operating unit for operating the reversing mechanism 110, which simplifies the structure of the various operating units provided in the driver's unit 15.

[0294] Furthermore, in a structure where the reversing mechanism 110 is operated using an operating member separately provided from the working clutch lever 23, the cutting clutch 75 and the reversing mechanism 110 are operated independently. Therefore, a structure is needed that can prevent the reversing mechanism 110 from being in an operating state (double engagement) when the cutting clutch 75 is engaged. In this regard, by adopting a structure that uses the working clutch lever 23 to operate the reversing mechanism 110, the operating members of the cutting clutch 75 and the reversing mechanism 110 can be made common. By making the operation of the cutting clutch 75 and the operation of the reversing mechanism 110 independent of each other in this operating member, double engagement can be reliably avoided.

[0295] Furthermore, in this embodiment, the following structure is adopted: the claw member 130 is connected to the working clutch lever 23 via a linkage mechanism 300 including an operating line 145; the claw member 130 is subjected to force by a spring 140 in the direction of engagement with the gear 120, and the operating line 145 is used to stretch the claw member 130 against the spring 140, thereby maintaining the claw member 130 in an unengaged state relative to the gear 120. With this structure, when the engagement of the claw member 130 is released and the reversing mechanism 110 is in a non-operating state, the engagement of the claw member 130 can be reliably released by stretching the claw member 130 using the operating line 145.

[0296] In other words, if a structure is used to disengage the pawl member 130 using the force of a spring, the following undesirable situations may arise: the operation of the working clutch lever 23 cannot be adequately transmitted to the pawl member 130 due to the state of the spring, or the pawl member 130 remains engaged with the gear 120 due to the action of the spring. Therefore, by using the tensioning operating line 145 as the operating member for disengaging the pawl member 130, the operation of the working clutch lever 23 can be reliably transmitted to the pawl member 130, thus preventing the pawl member 130 from engaging and reliably deactivating the reversing mechanism 110 through the operation of the working clutch lever 23. Furthermore, regarding the rotation of the pawl member 130 in the engagement direction, by using the force of the spring 140, compared to structures using, for example, a different line than the disengagement operating line 145, a simpler structure can be used to operate the pawl member 130.

[0297] Furthermore, in this embodiment, the linkage mechanism 300 that connects the claw member 130 and the working clutch lever 23 is configured such that, depending on the operating position of the working clutch lever 23 in the forward and backward direction, the claw member 130 rotates from the engaged position to the anti-engaged position and then to the disengaged position and the retracted position. With this structure, when the working clutch lever 23 is present in the operating position that engages the cutting section 3, which directly interferes with the operation of the reversing mechanism 110, the claw member 130 can be reliably retracted from the engaged position. Therefore, it is possible to reliably prevent the claw member 130 from engaging with the gear 120 while the cutting section 3 is operating, thereby achieving higher safety.

[0298] Furthermore, the combine harvester 1 of this embodiment includes a reversing switch 403, and the start-stop control of the engine 25 is performed by the controller 400 based on the detection signal of the reversing switch 403. With this structure, it is possible to prevent the engine 25 from starting when the working clutch lever 23 is in the reversing operation position P3 (the cutting reversal is engaged), which puts the reversing mechanism 110 into operation. Thus, for example, it is possible to eliminate undesirable situations such as: when the engine 25 is started in the cutting reversal engaged state, the feed section 30 rises, and the cutting input shaft 38 rotates in the reversing direction; due to the rotation of the cutting input shaft 38, the various operating parts of the cutting section 3, such as the conveyor 36 or the cutting device 32, which receive power from the cutting input shaft 38 and operate accordingly, operate unintentionally. As a result, higher safety is achieved.

[0299] [Second Implementation]

[0300] This second embodiment is another embodiment relating to the structure in the first embodiment for stretching the claw member 130 in the reverse engagement direction. Regarding other structures, they are the same as in the first embodiment; therefore, the structure for stretching the claw member 130 in the reverse engagement direction will be described below, and descriptions of other structures will be omitted. Incidentally, structures identical to those in the first embodiment will be labeled with the same reference numerals.

[0301] In the first embodiment, an operating line 145 is provided to stretch the claw member 130 in the reverse engagement direction; however, in the second embodiment, as... Figure 24 As shown, in addition to operation line 145, a second operation line 620 is also provided, thus creating two operation lines. Incidentally, Figure 24 This is a perspective view taken from the front. The left side is the front of combine harvester 1, the right side is the rear of combine harvester 1, the inner side is the right side of combine harvester 1, and the near-front side is the left side of combine harvester 1. Figure 24In the diagram, the shape of the claw component 130 is shown to differ from that of the first embodiment; however, Figure 24 The claw component 130 shown is the same as that in the first embodiment, and has: a support base 132, a claw body 133, and a sharp engaging portion 134.

[0302] One end of the second operating line 620 is the same as that of the operating line 145, and is connected to the claw member 130 by means of the connecting member 621. The locking pin 147, through which the claw member 130 passes, faces to the left (…). Figure 24 The protruding portion on the right side is connected to the upper end of the connecting part 621. On the right side of the locking pin 147 ( Figure 24 The protruding portion (towards the left) is connected to: a connecting part 146 for the operating line 145. On one side of the claw part 130 (right side, ... Figure 24 On the left side of the middle part, there is an operating line 145, on the other side of the claw component 130 (left side, Figure 24 The right side of the middle section is connected to the second operation line 620. Accordingly, by stretching the claw member 130 in the opposite engagement direction through at least one of the two operation lines, operation line 145 and second operation line 620, the claw member 130 can be placed in the non-engaged position, and the reversing mechanism 110 is in a non-operating state.

[0303] The second operating line 620 passes through the line support member 622, which is fixedly supported on the horizontal plate portion 142a of the support plate 142, and is extended in a state covered by a flexible covered tube 623. The line support member 622 is fixedly supported on the horizontal plate portion 142a by means of a nut member, etc., in a vertically extending form that passes through the horizontal plate portion 142a.

[0304] like Figure 25 as well as Figure 26 As shown, the other end of the second operation line 620 is connected to the electric motor 624 so that it can be operated using the electric motor 624 provided in the driver's unit 15. Figure 25 as well as Figure 26 In the middle, the left side is the front side of combine harvester 1, the right side is the rear side of combine harvester 1, the inner side is the right side of combine harvester 1, and the near front side is the left side of combine harvester 1.

[0305] In driver's seat 17 (see reference) Figures 1-3A support column 625 extending vertically is provided on the lower side of the motor, and an extension frame 626 extending forward and backward is provided from the support column 625 toward the front side. An electric motor 624 is mounted on the extension frame 626 by means of a mounting component 627. The mounting component 627 is fixed to the extension frame 626 by welding or bolts and nuts, and the electric motor 624 is fastened to the mounting component 627 by bolts and nuts.

[0306] The output shaft 624a of the electric motor 624 is configured to protrude from the electric motor 624 toward the left. A rotating plate 628 is fixedly connected to the output shaft 624a, and the output shaft 624a and the rotating plate 628 rotate together around a first left-right axis R1 in the left-right direction.

[0307] The other end of the second operating line 620 is connected to the rotating plate 628 via a connecting member 629. A connecting pin 630 is provided on the lateral side of the rotating plate 628, protruding to the left. One end of the connecting member 629 is fixedly connected to the connecting pin 630, and the second operating line 620 is fixedly connected to the other end of the connecting member 629. The second operating line 620 passes through the line support member 632, which is fixedly supported on the support plate 631, and extends in a covered state using a covered tube 623.

[0308] One end of the rotating plate 628 is connected to the output shaft portion 624a, and the other end of the rotating plate 628 is provided with a pin member 641 protruding to the left (the side away from the electric motor 624). A force-applying member 633 extending in the front-rear direction is connected to the pin member 641. The force-applying member 633 is applied a force by a spring 633a, causing the rotating plate 628 to rotate rearward. The force-applying member 633 is provided with a plate-shaped front connecting portion 633b and a rod-shaped rear connecting portion 633c, with the spring 633a disposed between the front connecting portion 633b and the rear connecting portion 633c.

[0309] The rear connecting portion 633c of the force-applying component 633 is fixedly connected to a connecting plate 634, which is L-shaped when viewed from above. The connecting plate 634 is fixedly connected to the swing support plate 636 by means of a connecting pin 635. The swing support plate 636 is supported on the other component in a manner that allows it to swing freely about a second left-right axis R2 in the left-right direction relative to the other components (not shown in the figure). The swing support plate 636 and the rear connecting portion 633c of the force-applying component 633 swing together about the second left-right axis R2.

[0310] The rotating plate 628 is set in a manner that allows it to rotate freely about the first left and right axes R1. Figure 25The release position shown is the same as Figure 26 The location of action is shown. Figure 25 The release position shown is the position where the gripper component 130 is released by the stretching action of the second operating line 620 toward the reverse engagement direction. Figure 25 The release position shown brings the portion of the rotating plate 628 connected to the second operating line 620 close to the line support member 632, thereby relaxing the second operating line 620 and releasing the tension. Figure 26 The indicated position is where the stretching action of the claw component 130 towards the reverse engaging direction, achieved using the second operating line 620, is applied. Figure 26 The position shown in the diagram is such that the part of the rotating plate 628 connected to the second operating line 620 is separated from the line support member 632, thereby stretching the second operating line 620 so that the stretching effect takes effect.

[0311] The rotating plate 628 is subjected to a force towards the rear by the force exerted on the spring 628a at component 633, thus, towards Figure 25 The applied force is restored to the released position. The rotation of the rotating plate 628 from the released position to the applied position is driven by the rotational force of the electric motor 624. When the electric motor 624 is turned on, the output shaft 624a rotates clockwise around the first left and right axis R1. Figure 25 The rotating plate 628 is driven to rotate from the release position (refer to arrow N1) by the rotational drive. Figure 25 Orientation towards the point of action (reference) Figure 26 ) rotate. When the electric motor 624 is in the off state, the force applied to component 633 is used to rotate the output shaft 624a counterclockwise around the first left and right axis R1. Figure 26 The rotating plate 628 is driven to rotate from the operating position (refer to arrow N2) by the rotational drive. Figure 26 Orientation towards release position (refer to) Figure 25 Rotate.

[0312] like Figure 25 as well as Figure 26As shown, the system includes a release position sensor 638 for detecting when the rotating plate 628 is in the release position, and an action position sensor 640 for detecting when the rotating plate 628 is in the action position. The release position sensor 638 is fixed to an L-shaped support plate 637 extending to the left from the mounting member 627, located lower than the output shaft portion 624a. The action position sensor 640 is fixed to an L-shaped support plate 639 extending to the left from the mounting member 627, located upper than the output shaft portion 624a. By having the rotating plate 628 in contact with the release position sensor 638 and the action position sensor 640, the position of the rotating plate 628 in either the release or action position can be detected using these sensors.

[0313] Regarding the switching between the on and off states of electric motor 624, such as... Figure 21 As shown by the dashed line, the controller 400 switches the electric motor 624 between an on and off state based on the detection state of the cutting switch 402. The working clutch lever 23 is oriented towards the position corresponding to the cutting "on" state, i.e., the second working operation position P2 (see reference). Figure 14 When the operation is initiated, the working clutch lever 23 is detected to be in the second working position P2 using the cut switch 402. If no detection signal is input from the cut switch 402, the controller 400 disconnects the electric motor 624; if a detection signal is input from the cut switch 402, the controller 400 switches the electric motor 624 to the on state.

[0314] If the working clutch lever 23 is not oriented toward the second working position P2 (refer to...) Figure 14 When the operation is performed, the electric motor 624 becomes disconnected, and the rotating plate 628 is located in the position of Figure 25 The release position shown is achieved by the stretching action of the second operating line 620 on the pawl component 130 in the reverse engagement direction. Conversely, with the operating clutch lever 23 operated towards the second operating position P2, the electric motor 624 switches to the on state, and the rotating plate 628 is located in... Figure 26 The position shown is where the claw component 130 is stretched in the opposite engagement direction by the second operating line 620.

[0315] In this second embodiment, the claw member 130 can be stretched in the anti-engaging direction using only either the operation line 145 or the second operation line 620, thereby achieving the desired effect. Figure 23 As shown in (b) or (c), the claw component 130 is positioned in the non-engaged position, thus deactivating the reversing mechanism 110. The switching between the deactivating and operating states of the reversing mechanism 110 will be explained below.

[0316] As described in the first embodiment, if the working clutch lever 23 is not oriented toward the reverse operation position P3 (see reference...) Figure 14 When the clutch lever 23 is operated, the tension of the pawl component 130 towards the reverse engagement direction is utilized by the operating line 145. Therefore, even without operating the clutch lever 23 towards the reverse operation position P3, the tension of the operating line 145 can be utilized regardless of the position of the second operating line 620. Figure 23 Position the claw component 130 in the non-engaged position as shown in (b) or (c), thereby disabling the reversing mechanism 110.

[0317] As described in the first embodiment, when the working clutch lever 23 is operated toward the reverse operation position P3, as Figure 18 As shown, the restraint unit 500 is used to restrain the movement of the working clutch lever 23 toward the reverse operation position P3. In order to release the restraint unit 500, the operator needs to depress the parking brake pedal 601.

[0318] For example, when the parking brake pedal 601 is depressed, there may be a situation where the operating clutch lever 23 is operated towards either the first operating position P1 or the second operating position P2 for a test run. In this case, since the parking brake pedal 601 is depressed, the restraint of the restraint unit 500 is released. Therefore, due to misoperation of the operating clutch lever 23, it is possible that the operating clutch lever 23 may be operated towards the reverse operating position P3.

[0319] In this second embodiment, in addition to the operating line 145, a second operating line 620 is also provided. When the operating clutch lever 23 is oriented towards the second operating position P2 (see reference...),... Figure 14 When performing the operation, such as Figure 26 As shown, the electric motor 624 is switched to the on state, enabling the second operating line 620 to exert a stretching effect on the pawl component 130 in the reverse engagement direction. Accordingly, during trial operation, if the operating clutch lever 23 is operated towards the second operating position P2, the stretching effect of the second operating line 620 is utilized, and if... Figure 23 Position the claw component 130 in the non-engaged position as shown in (b) or (c), thereby disabling the reversing mechanism 110.

[0320] During the trial operation, the working clutch lever 23 was moved from the second working position P2 to other working positions (see reference). Figure 14 ) to move, and as Figure 25As shown, when the electric motor 624 switches to the off state, the tension on the claw component 130 towards the reverse engagement direction by the second operating line 620 is released. At this time, as the electric motor 624 switches to the off state, the force applied to the component 633 causes the rotating plate 628 to move from the operating position (refer to the reference position). Figure 26 Orientation towards release position (refer to) Figure 25 The clutch lever 23 rotates, thereby releasing the tension of the second operating line 620. Since this series of actions requires a certain amount of time, there is a time delay after the operating clutch lever 23 moves from the second operating position P2 to other operating positions before the tension of the second operating line 620 is actually released.

[0321] This time delay ensures the time until the rotation of the cutting input shaft 38 stops. In other words, when the working clutch lever 23 moves from the second working position P2 to another working position, the cutting clutch 75 disengages, and the rotation of the cutting input shaft 38 stops. However, sometimes the cutting input shaft 38 may continue to rotate due to inertia. In this case, due to the aforementioned time delay, the rotation of the cutting input shaft 38 caused by inertia is stopped. Therefore, even if the working clutch lever 23 is then operated towards the reverse working position P3, it is not necessary to engage the claw member 130 with the gear 120, which rotates integrally with the cutting input shaft 38, thus preventing damage to the gear 120 or the claw member 130.

[0322] Accordingly, in addition to various components that restrain the movement of the linkage mechanism 300, the restraint unit 500 may also include: a second operating line 620, an electric motor 624, a rotating plate 628, and a force-applying component 633, etc., for exerting the stretching effect of the second operating line 620.

[0323] When the restraint unit 500 is constructed using only the second operating line 620, the electric motor 624, the rotating plate 628, and the force-applying component 633, which are used to exert the stretching effect of the second operating line 620, the following problems exist.

[0324] For example, when the electric motor 624 malfunctions and remains disconnected, such as Figure 25 As shown, the tension of the second operating line 620 is released. Accordingly, when the restraint unit 500 is constructed using only various components for exerting the tension of the second operating line 620, when the electric motor 624 remains disconnected due to a malfunction or other reasons, the tension of the second operating line 620 is released, as shown. Figure 23As shown in (a), the claw component 130 is in the engaged position, the reversing mechanism 110 remains operational, and it may be impossible to perform the desired operation using the combine harvester 1.

[0325] However, in this second embodiment, as described in the first embodiment, the restraining part 500 includes various components that restrain the movement of the linkage mechanism 300. Therefore, even when the tension of the second operating line 620 is released, the tension of the operating line 145 is still activated. Figure 23 As shown in (b) or (c), the claw component 130 can be placed in the non-engaged position, and the reversing mechanism 110 can be deactivated.

[0326] [Other Implementation Methods]

[0327] Other embodiments of the present invention will be described. Furthermore, the structures of the embodiments described below are not limited to individual application, but can also be combined with the structures of other embodiments.

[0328] (1) In the above embodiment, the restraint unit 500 can switch between the restraint state and the restraint release state in conjunction with the parking brake mechanism 600 in the working state and the non-working state. However, the restraint unit can also switch between the restraint state and the restraint release state independently of the parking brake mechanism 600. The configuration of the restraint unit can be appropriately changed.

[0329] For example, the restraint unit can be configured to restrain the movement of the rotating arm 320, restrain the movement of various components in the linkage mechanism 300, or directly restrain the movement of the operating clutch lever 23, thereby switching to a restraint state. In this way, when restraining the movement of the components of the linkage mechanism 300 or the operating clutch lever 23, for example, when the operating clutch lever 23 is operated to the reverse operating position P3, restraining the movement of the components of the linkage mechanism 300 or the operating clutch lever 23 maintains a state in which the operating line 145 in the linkage mechanism 300 is subjected to tension. Furthermore, by a predetermined time elapsed from the moment the operating clutch lever 23 is operated to the reverse operating position P3, and a predetermined condition is met, the restriction on the movement of the components of the linkage mechanism 300 or the operating clutch lever 23 is mechanically released using the force of the applying body, thereby releasing the tension on the operating line 145 and switching to a restraint-released state. The specified time can be, for example, the time required to stop the rotation of the cutting input shaft 38 and to stop the rotation of the conveyor 36 in the forward direction.

[0330] Alternatively, instead of the linkage mechanism 300, a reverse mechanism actuator that freely switches the reverse mechanism 110 between the working and non-working states can be provided. When the reverse switch 403 detects that the working clutch lever 23 has moved to the reverse operation position P3, the restraining part maintains the restrained state. If a predetermined time has elapsed since the reverse switch 403 detected that the working clutch lever 23 has moved to the reverse operation position P3, the restraining part becomes the restrained released state, and the reverse mechanism actuator operates, thereby switching the reverse mechanism 110 to the working state. Thus, in the above embodiment, a mechanical structure that restrains the movement of the working clutch lever 23, etc., is used as the restraining part; however, an electrical structure using the reverse switch 403 or the reverse mechanism actuator can also be used.

[0331] Furthermore, in the above embodiment, the operating movement path is configured as follows: the operating movement path connecting the second operating position P2 and the first operating position P1 is orthogonal to the operating movement path connecting the first operating position P1 and the stop operating position P0, and the operating movement path connecting the first operating position P1 and the stop operating position P0 is orthogonal to the operating movement path connecting the stop operating position P0 and the reverse operating position P3. However, by changing the shape of the operating movement path from the second operating position P2 to the reverse operating position P3, the movement of the operating clutch lever 23 toward the reverse operating position P3 can also be restrained.

[0332] For example, regarding the operating movement path connecting the first operating position P1 and the stop operating position P0, by forming the operating clutch lever 23 into a bent shape that temporarily moves forward and then moves backward, the movement of the operating clutch lever 23 toward the reverse operating position P3 can be restrained. In this case, a predetermined time is required before operating the operating clutch lever 23 toward the reverse operating position P3; by making the time required to operate the operating clutch lever 23 the predetermined time, the predetermined condition is met.

[0333] Alternatively, a manually operable limiting part can be included. This limiting part abuts against the working clutch lever 23 between the stop operating position P0 and the reverse operating position P3, thereby restraining the movement of the working clutch lever 23 toward the reverse operating position P3. In this case, with the working clutch lever 23 in the stop operating position P0, the operator or others operate the limiting part to move it to a retracted position where it does not abut against the working clutch lever 23, thus allowing the working clutch lever 23 to move toward the reverse operating position P3. Furthermore, when moving the working clutch lever 23 from the stop operating position P0 toward the reverse operating position P3, by providing greater resistance than when moving toward other operating positions, the movement of the working clutch lever 23 toward the reverse operating position P3 can also be restrained. In this case, a predetermined time is required before operating the working clutch lever 23 toward the reverse operating position P3; by ensuring that the time required to operate the working clutch lever 23 is the predetermined time, the predetermined condition is met.

[0334] (2) In the above embodiment, the lifting cylinder 39 that causes the feeding section 30 to lift is a single-acting hydraulic cylinder that applies hydraulic pressure when the feeding section 30 is raised. However, it is not limited to this and the lifting cylinder 39 can be a double-acting cylinder.

[0335] (3) In the above embodiment, the operating member used for operating the reversing mechanism 110 is a working clutch lever 23 for operating the cutting section 3 and the threshing section 7, but it is not limited to this. The operating member for operating the reversing mechanism 110 can be an operating member for operating either the cutting section 3 or the threshing section 7, or an operating member that is set differently from the operating member for operating the reversing mechanism 110. However, from the viewpoint of simplifying the structure by utilizing the existing structure, or avoiding the cutting section 3 and the reversing mechanism 110 from being in a working state at the same time, it is preferable that the operating member of the reversing mechanism 110 is a working operating member for operating at least one of the cutting section 3 and the threshing section 7.

[0336] (4) In the above embodiment, the lever guide portion 150 of the operating clutch lever 23 is configured to form a generally crank shape using the first moving path portion 161, the second moving path portion 162, and the third moving path portion 163; however, it is not limited to this configuration. In the lever guide portion 150, the direction (second direction) along which the third moving path portion 163 travels from the stop operating position P0 to the reverse operating position P3 can be any direction different from the direction (first direction) along which the first moving path portion 161 travels from the stop operating position P0 to the first operating position P1. Therefore, for example, it can be configured such that the third moving path portion 163 is arranged forward from the stop operating position P0, and the lever guide portion 150 is generally formed into a "U" shape using each moving path portion.

[0337] (5) In the above embodiment, the engine 25 can be started and stopped by cutting off the power supply from the battery 406 to the starter using the controller 400, but it is not limited to this.

[0338] Industrial applications

[0339] This invention can be applied to various combine harvesters equipped with a conveying section that transports the stalks cut by the cutting section toward the threshing section.

[0340] Explanation of reference numerals in the attached figures:

[0341] 1… combine harvester; 2… traveling body (body); 3… cutting section; 7… threshing section; 23… working clutch lever (operating operation component); 36… conveyor (conveying device); 38… cutting input shaft (conveying mechanism); 110… reversing mechanism (rotation limiting part); 300… linkage mechanism (linkage mechanism for rotation limiting part); 500… restraint part; 600… parking brake mechanism (body movement limiting part); 601… parking brake pedal (body movement limiting operation part).

Claims

1. A combine harvester characterized by comprising: a cutting section that cuts a stalk; a conveying section that conveys the stalk cut by the cutting section toward a threshing section; a machine body that has the cutting section, the conveying section, and the threshing section; and a machine body movement restriction section that restricts movement of the machine body by becoming an active state in response to a step-on operation of a machine body movement restriction operation section, the conveying section has a conveying mechanism that conveys the cut stalk toward the threshing section by rotation in one direction, a rotation restriction section that restricts rotation of the conveying mechanism in the one direction to make the conveying mechanism into a restricted state, and a holding section that holds the conveying mechanism into the restricted state until a prescribed condition is satisfied, the conveying mechanism is configured to rotate in a direction opposite to the one direction in response to a lifting operation of the conveying section in the restricted state based on the rotation restriction section, the machine body movement restriction section is configured to be unable to switch from the active state to an inactive state in a state in which the conveying mechanism is made into the restricted state by the rotation restriction section.

2. The combine harvester according to claim 1, characterized in that the prescribed condition includes that the machine body movement restriction section is in the active state.

3. The combine harvester according to claim 1 or 2, characterized in that the combine harvester includes a work operation member that operates the cutting section and the conveying section, operation positions of the work operation member include a work operation position in which the cutting section is made into an active state and the conveying mechanism is rotationally driven in the one direction, a stop operation position in which the cutting section is made into an inactive state and rotation drive of the conveying mechanism in the one direction is stopped, and a reverse operation position in which the cutting section is made into the inactive state and the conveying mechanism is made into the restricted state by the rotation restriction section and is able to rotate in the direction opposite to the one direction, the holding section is configured to hold the conveying mechanism into the restricted state by holding movement of the work operation member toward the reverse operation position until the prescribed condition is satisfied.

4. The combine harvester according to claim 3, characterized in that the combine harvester includes the machine body movement restriction section that restricts movement of the machine body by becoming the active state in response to the step-on operation of the machine body movement restriction operation section, a second operation line is further included that is able to hold the conveying mechanism into the restricted state even in a case in which the work operation member is moved from the work operation position to the reverse operation position, when the machine body movement restriction section is in the active state and the work operation member is allowed to move toward the reverse operation position.

5. The combine harvester according to claim 4, characterized in that ​ when the second operation wire is in the non-operation state, the conveying mechanism is allowed to be in the restricted state, when the conveying mechanism is in the restricted state, even if the second operation wire is not changed from the non-operation state to the operation state, by moving the work operation member from the reverse operation position toward the work operation position or the stop operation position, the restricted state of the conveying mechanism can be released.

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