Combine harvester

Abstract

The invention provides a combine harvester which can improve the screening precision of a screening part on threshed materials. This combine harvester is provided with: a threshing unit for threshing crops; a swing screening device (43) that screens the threshed material that has been threshed by the threshing unit; and a winnower (47) that conveys screening air to the oscillating screening device (43), the oscillating screening device (43) having a grain screen (130) that screens the threshed material, and the grain screen (130) being provided so as to be capable of rotating so that the downwind side of the screening air moves up and down with the downwind side of the screening air as a fulcrum part (138).

Description

Technical Field

[0001] The present invention relates to a combine harvester having a oscillating screening device for screening grains threshed by means of a threshing section. Background Technology

[0002] The combine harvester has the following structure: a conveying device transports the crop cut by the harvesting section to the threshing section, and a screening section located below the threshing section screens the grains (threshed product) after threshing. The screening section has a oscillating screening device that screens the grains by oscillation. As a screening structure, the oscillating screening device includes: a coarse screen having multiple blades; and a grain screen located below the coarse screen. Additionally, the screening section is equipped with a winnowing fan, a fan, and other structures that generate screening air for achieving the air-force screening effect.

[0003] Regarding the structure of the screening section, Patent Document 1 describes a structure that allows for changing the area of ​​the grain screen and switching the airflow of the screening air flowing above the grain screen in response to the screening air from the winnowing machine.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 6-292448 Summary of the Invention

[0007] Regarding the previous screening section, for example, when the amount of threshed material is large, there is a problem that the screening accuracy of the threshed material cannot be fully obtained in the screening section.

[0008] The present invention was made in view of the above problems, and its object is to provide a combine harvester that can improve the screening accuracy of the screening section for threshed materials.

[0009] The combine harvester of the present invention comprises: a threshing section for threshing crops; a oscillating screening device for screening the threshed material after threshing by the threshing section; and a winnowing machine for supplying screening air to the oscillating screening device, wherein the oscillating screening device has a grain sieve for screening the threshed material, the grain sieve being configured to rotate in such a way that the upwind side of the screening air moves up and down with the downwind side of the screening air as a support.

[0010] The combine harvester of the present invention is based on the combine harvester, wherein the oscillating screening device has: a coarse screen disposed above the grain screen for screening the threshed material, the coarse screen including a plurality of blades arranged in such a way that the tilt angle can be adjusted, and configured to adjust the downward leakage amount of the threshed material according to the tilt angle of the plurality of blades, the grain screen being configured to rotate in conjunction with the change of the tilt angle of the plurality of blades.

[0011] The combine harvester involved in this invention is based on the combine harvester, wherein the oscillating screening device has: a grain disc disposed on the front side of the grain sieve and receiving the threshed material leaking down from the coarse sieve, and a sieve section disposed on the rear side of the grain disc in which a plurality of sieve lines are arranged in parallel.

[0012] The combine harvester involved in this invention is based on the combine harvester, wherein the swing screening device is disposed between the left and right side plates, and the left and right outer side plates are provided with an opening that includes at least a portion of the grain sieve in the opening range when viewed from the side.

[0013] The combine harvester of the present invention comprises: a threshing section for threshing crops; a oscillating screening device for screening the threshed material after threshing by the threshing section; and a winnowing machine for supplying screening air to the oscillating screening device, wherein the oscillating screening device includes: a coarse screen configured to vary the downward leakage amount of the threshed material according to the tilt angle of a plurality of blades; and a grain screen disposed below the coarse screen for screening the threshed material, and further includes: a material quantity detection sensor for detecting the amount of threshed material on the coarse screen; and a control unit for controlling the adjustment of the tilt angle of the plurality of blades based on the detection value of the material quantity detection sensor, wherein the grain screen is configured to be supported so as to rotate in a manner that the upwind side of the screening air moves up and down with the downwind side of the screening air as a support, and rotates in conjunction with the change in the tilt angle of the plurality of blades.

[0014] In other embodiments of the present invention, the combine harvester further includes a second processing quantity detection sensor, which is disposed on the upwind side of the screening air relative to the grain sieve and detects the amount of threshed material. The control unit corrects the angle of the grain sieve in the control based on the detection value of the second processing quantity detection sensor.

[0015] In other embodiments of the present invention, the combine harvester is based on the combine harvester, wherein the oscillating screening device is disposed between the left and right side plates, and further comprises an actuator disposed on either of the left and right side plates and causing the tilt angle of the plurality of blades to change.

[0016] The combine harvester of the present invention comprises: a threshing section for threshing crops; a oscillating screening device for screening the threshed material after threshing by the threshing section; and a winnowing machine for supplying screening air to the oscillating screening device, wherein the oscillating screening device includes: a coarse screen configured to vary the downward leakage amount of the threshed material according to the tilt angle of a plurality of blades; and a grain screen disposed below the coarse screen for screening the threshed material, the grain screen being configured to direct the screening air downwind. The device rotates by moving the screening air up and down on the windward side as a support shaft, and further includes: a processing quantity detection sensor that detects the amount of threshed material on the coarse screen; a second processing quantity detection sensor that is disposed on the windward side of the screening air relative to the grain screen and detects the amount of threshed material; and a control unit that controls the adjustment of the tilt angle of the plurality of blades based on the detection value of the processing quantity detection sensor, and controls the adjustment of the rotation angle of the grain screen based on the detection value of the second processing quantity detection sensor.

[0017] In other embodiments of the present invention, the combine harvester is based on the combine harvester, wherein the oscillating screening device is disposed between the left and right side plates and further comprises: a first actuator disposed on either of the left and right side plates and causing the tilt angle of the plurality of blades to change; and a second actuator disposed on either of the left and right side plates and causing the rotation angle of the grain sieve to change.

[0018] Invention Effects

[0019] According to the present invention, the screening accuracy of the screening section for threshed materials can be improved. Attached Figure Description

[0020] Figure 1 This is a left view of the combine harvester according to the first embodiment of the present invention.

[0021] Figure 2 This is a right view of the combine harvester according to the first embodiment of the present invention.

[0022] Figure 3 This is a top view of the combine harvester according to the first embodiment of the present invention.

[0023] Figure 4This is a diagram illustrating the power transmission structure of a combine harvester according to the first embodiment of the present invention.

[0024] Figure 5 This is a left sectional view showing the structure of the threshing section and the screening section according to the first embodiment of the present invention.

[0025] Figure 6 This is a left sectional view showing the structure of the screening section according to the first embodiment of the present invention.

[0026] Figure 7 This is a top cross-sectional view showing the grain sieve and its surrounding structure according to the first embodiment of the present invention.

[0027] Figure 8 This is a schematic front partial sectional view illustrating the support structure of the coarse screen blades according to the first embodiment of the present invention.

[0028] Figure 9 This is a left view showing the middle part of the swing screening device according to the first embodiment of the present invention in the front-rear direction.

[0029] Figure 10 This is a left view showing the operational structure of the coarse screen according to the first embodiment of the present invention.

[0030] Figure 11 This is an explanatory diagram regarding the operating state of the operating arm according to the first embodiment of the present invention.

[0031] Figure 12 This is a left view showing a portion of the screening section according to the first embodiment of the present invention.

[0032] Figure 13 This is an exploded rear sectional view showing the mounting structure of the cover according to the first embodiment of the present invention.

[0033] Figure 14 This is a left view showing a modified example of the swing screening device according to the first embodiment of the present invention.

[0034] Figure 15 This is a left sectional view showing the structure of the screening section according to the second embodiment of the present invention.

[0035] Figure 16 This is a top cross-sectional view showing the grain sieve and its surrounding structure according to the second embodiment of the present invention.

[0036] Figure 17 This is a schematic partial sectional view of the front view of the support structure of the coarse screen blades according to the second embodiment of the present invention.

[0037] Figure 18 This is a left view showing the structure of the middle part of the swing screening device in the front-to-back direction and the angle adjustment device according to the second embodiment of the present invention.

[0038] Figure 19 This is a left view showing the operational structure of the coarse screen according to the second embodiment of the present invention.

[0039] Figure 20 This is an exploded perspective view showing the structure of the angle adjustment device according to the second embodiment of the present invention.

[0040] Figure 21 This is a left view showing a portion of the screening section according to the second embodiment of the present invention.

[0041] Figure 22 This is a left view showing the structure of the processing quantity detection sensor according to the second embodiment of the present invention.

[0042] Figure 23 This is a block diagram illustrating the control structure of a combine harvester according to the second embodiment of the present invention.

[0043] Figure 24 This is a left view showing a modified example of the swing screening device according to the second embodiment of the present invention.

[0044] Figure 25 This is a left view showing the structure of the middle part of the swing screening device in the front-rear direction, the angle adjustment device, and the correction angle adjustment device according to the third embodiment of the present invention.

[0045] Figure 26 This is a left view showing the structure of the linkage mechanism according to the third embodiment of the present invention.

[0046] Figure 27 This is a block diagram illustrating the control structure of a combine harvester according to the third embodiment of the present invention.

[0047] Figure 28 This is a left view showing a portion of the screening section according to the third embodiment of the present invention.

[0048] Figure 29 This is a left view showing the structure of the middle part of the oscillating screening device in the front-to-back direction, as well as the coarse screening angle adjustment device and the grain screening angle adjustment device according to the fourth embodiment of the present invention.

[0049] Figure 30 This is a block diagram illustrating the control structure of a combine harvester according to the fourth embodiment of the present invention.

[0050] Figure 31This is a top sectional view showing the structure of the winnowing machine speed belt device according to the first embodiment of the present invention.

[0051] Figure 32 This is a top sectional view showing the structure of the winnowing machine speed belt device according to the first embodiment of the present invention.

[0052] Figure 33 This is a right view showing the fixed pulley according to the first embodiment of the present invention.

[0053] Figure 34 This is a left view showing the movable pulley according to the first embodiment of the present invention.

[0054] Figure 35 This is an expanded schematic diagram used to explain the structure of the claw engagement portion according to the first embodiment of the present invention.

[0055] Explanation of reference numerals in the attached figures

[0056] 1… Combine harvester; 7… Threshing section; 43… Oscillating screening device; 47… Winnowing machine; 50… Control section; 112… Lower grain disc; 120… Coarse screen; 121… Coarse screen blades; 130… Grain screen; 138… Support shaft; 139… Side plate; 139L… Side plate (left and right outer side plate); 151… Coarse screen operating arm; 171… Wire; 181… Operating arm; 190… Screen section; 191… Screen wire section; 200… Opening; 210… Cover; 230… Linkage mechanism; 300… Angle adjustment device; 301… Motor (actuator); 301B… First motor (first actuator); 301C… Second motor (second actuator); 350… Processing quantity detection sensor; 360… Second processing quantity detection sensor; 430… Linkage mechanism. Detailed Implementation

[0057] [First Implementation Method]

[0058] The first embodiment of the present invention will be described. Utilizing... Figures 1 to 5 The overall structure of the combine harvester 1 according to this embodiment will be described. Furthermore, in the following description, the left side ( ) will be positioned towards the front of the combine harvester 1. Figure 3 (lower side) and right side ( Figure 3 The upper side of the machine is set as the left and right sides of the combine harvester 1, respectively.

[0059] like Figure 1 and Figure 2As shown, the combine harvester 1 according to this embodiment is a common type of combine harvester that can harrow the crops (rice, wheat, soybeans, corn, etc.) from the harvested field into the machine body, thresh / screen / store the grains, and output them appropriately to the outside of the harvester. The combine harvester 1 has: a traveling body 2 capable of autonomous movement; and a cutting section 3, which is provided at the front end of the traveling body 2. The cutting section 3 is configured as a cutting device that cuts the uncut ears of rice, wheat, etc., and picks them up, and is mounted on the traveling body 2 in a lifting manner.

[0060] The machine body 2 includes a running section 4 configured as a tracked running device with a pair of left and right track sections 5, 5. A machine frame 6 is mounted between the left and right track sections 5, 5. Each track section 5 has: multiple rotating bodies including a drive sprocket 5a disposed at its front end; and a track 5c wound around the rotating body. The drive sprocket 5a is driven to rotate by receiving power from the engine 25 of the combine harvester 1.

[0061] On the left side of the machine frame 6 are provided: a threshing section 7, which threshes the ears of grain cut and supplied by the cutting section 3; and a screening section 8, which screens the grains after threshing by the threshing section 7. The threshing section 7 and the screening section 8 are arranged behind the cutting section 3 such that the threshing section 7 is on the upper layer and the screening section 8 is on the lower layer.

[0062] On the frame 6, a grain storage section 9 is provided on the right side of the threshing section 7 and the screening section 8. This grain storage section 9 has a grain bin 10 for storing the grains (refined grains) screened by the screening section 8. Inside the grain bin 10, a lower discharge conveyor 11 is provided to transport the stored grains towards the discharge outlet of the grain bin 10 (see reference). Figure 4 The longitudinal conveyor 12 is erected vertically in a manner connected to 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 using the above-mentioned conveyor, and the grains are discharged from the rice inlet 14 located at the end of the grain discharge conveyor 13 into the cargo box of a truck, container, etc.

[0063] On the frame 6, in front of the grain storage section 9, specifically on the right front side of the frame 6, is a driver's compartment 15 for the operator to sit in. The driver's compartment 15 is covered by a cab 16. The driver's compartment 15 includes: a driver's seat 17; a steering wheel 18 positioned in front of the driver's seat 17; and various operating components such as a main gearshift lever 19, a secondary gearshift lever, and a working clutch lever (see reference). Figure 2The working clutch lever is used for engaging the threshing clutch 57 and the cutting clutch 75 (see reference). Figure 4 ) Operational components used for engaging and disengaging operations.

[0064] An engine 25, serving as the drive source, is located below the driver's compartment 15 on the fuselage frame 6. The engine 25 is positioned in the front right side space of the fuselage frame 6, utilizing the space below the driver's compartment 15. The engine 25 is, for example, a diesel engine.

[0065] The harvesting section 3 will be described below. The harvesting section 3 includes a feeder 30 as a conveying device, a platform 31 as a grain harvesting table, a cutter device 32, a pair of left and right dividers 33, 33, and a harrowing reel 34.

[0066] The feeder 30 is a feeding and conveying device that transports the ear stalks cut by the cutting section 3 to the threshing section 7. The feeder 30 includes: a feeding chamber 35 as a housing; and a conveyor 36 for transporting the ear stalks (see reference). Figure 4 The feeder 30 is located within the feeding chamber 35. The feeding chamber 35 is configured as an approximately square cylinder when viewed from above, with its long side as the front-to-back direction. The feeder 30 is located on the left side of the driver's cab 16 (see reference). Figure 3 ), 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 (see reference). Figure 1 ).

[0067] Platform 31 is configured as a horizontally elongated bucket and is connected to the front side of feeder 30 via a connection to the front opening of feed chamber 35. A rake-gathering auger (platform-type auger) 37 is installed inside platform 31. The rake-gathering auger 37 is configured to rotate about the left-right axis.

[0068] The cutting device 32 is located at the lower front edge of the platform 31 and is configured as a pusher. A pair of left and right tillers 33, 33 are positioned to protrude forward from the left and right sides of the front of the platform 31. The harrowing reel 34 is a reel with a toothed beam and is positioned above and in front of the harrowing auger 37. The harrowing reel 34 is pivotally supported at its base between the ends of a pair of left and right reel support arms 34a, 34a on the platform 31, allowing it to rotate in the left-right direction. While rotating, the harrowing reel 34 continuously acts on the pod-bearing portion of the ear stalk, harrowing it towards the harrowing auger 37. The operation of each part of the harvesting section 3 is powered by the engine 25, which is transmitted via various transmission mechanisms.

[0069] A front rotating member 26 is provided at the rear of the feeder 30 to feed the stalks conveyed by the conveyor 36 into the threshing port 7a. The front rotating member 26 is located between the end of the conveyor 36 and the threshing port 7a. The front rotating member 26 has: a roughly cylindrical rotating body 27, referred to as a threshing drum, etc.; and a front rotating member shaft 28 (see reference). Figure 4 The conveyor 36 is axially oriented in the left-right direction. Starting from the end of the conveyor 36, the stalks conveyed by the feeder 30 are fed into the threshing chamber 7b of the threshing section 7 from the threshing port 7a using the front rotating member 26.

[0070] Regarding the conveyor 36 inside the feeding chamber 35, a cutting section input shaft (feeding chamber conveyor shaft) 38, which serves as the drive shaft supporting the end of its conveying section, is located at the front of the threshing section 7 and has its axial direction in the left-right direction. The rear end of the feeder 30 is supported by the cutting section input shaft 38 as its rotation axis, allowing it to rotate relative to the traveling body 2. Furthermore, a lifting cylinder 39, which functions as a hydraulic cylinder, is sandwiched between the lower surface of the feeding chamber 35 and the machine frame 6 (see reference). Figure 1 ).

[0071] The cutting unit 3 is configured to move up and down relative to the traveling body 2 due to the rotation of the feeder 30, which accompanies the extension and retraction of the lifting cylinder 39. The lifting and lowering of the cutting unit 3 causes it to move up and down about the input shaft 38, thereby adjusting its height. The lifting and lowering of the cutting unit 3 is operated using a pre-defined operating unit provided in the driving unit 15.

[0072] The threshing section 7 and the screening section 8 will be described below. The threshing section 7 includes: a threshing cylinder 40 disposed within a threshing chamber 7b that opens forward through a threshing port 7a; and a receiving screen 42 disposed below the threshing cylinder 40. The threshing chamber 7b is formed by a frame 21 disposed on the machine body frame 6.

[0073] The threshing cylinder 40 is supported by a threshing cylinder shaft 41 with the rear-to-rear direction as its axial direction, enabling it to rotate. For example... Figure 5 As shown, the threshing cylinder 40 has a cylindrical main body with a threshing cylinder shaft 41 along a central axis, and a plurality of threshing cylinder bars 40a protruding from the outer peripheral surface of the main body. On the upper side of the threshing cylinder 40, a plurality of dust valves 22 for adjusting the conveying speed (accumulation time) of the threshed material within the threshing chamber 7b are configured to be angle-adjustable relative to the top surface 7c of the threshing chamber 7b. A receiving mesh 42 allows the grains to leak downwards and is configured to run along the lower outer peripheral surface of the threshing cylinder 40.

[0074] The screening section 8 includes: a oscillating screening device 43 as an oscillating screening section, which is disposed below the threshing section 7 across the receiving net 42; an oscillating mechanism 44, which includes an oscillating shaft 44a; a first-grade product conveyor 45; a second-grade product conveyor 46; and a winnowing machine 47 (see reference). Figure 5 The oscillating mechanism 44 uses rotational power from the drive source to drive the oscillating shaft 44a to rotate, causing the oscillating screening device 43 to oscillate back and forth in a predetermined direction when viewed from above. An auxiliary winnowing machine 71, serving as a primary fan, is located above and in front of the winnowing machine 47. Furthermore, a secondary fan 72 is located behind the winnowing machine 47, between the first-grade conveyor 45 and the second-grade conveyor 46 in the back-to-back direction.

[0075] As a structure for gravity screening, the oscillating screening device 43 includes: an upper grain disc 111; a coarse screen 120 disposed behind the upper grain disc 111 and used for coarse screening by adjusting the downward leakage amount (leakage amount) of grains; a lower grain disc 112 disposed below the coarse screen 120; and a grain screen 130 disposed below the coarse screen 120.

[0076] A first-grade conveyor 45 is configured within a first-grade guide trough 45b extending along the width of the machine body, in a manner that allows first-grade grains (first-grade product) to collect. A second-grade conveyor 46 is configured within a second-grade guide trough 46b extending along the width of the machine body, located behind the first-grade conveyor 45, in a manner that allows second-grade grains (second-grade product) to collect. A winnowing machine 47 is located at the front of the screening section 8, and conveys screening air that passes from the lower front to the upper rear to the oscillating screening device 43.

[0077] A reduction conveyor 48 is provided on the right side of the machine body where the threshing section 7 and the screening section 8 are located (see reference). Figure 4 The reduction conveyor 48 is positioned so that its lower end is located near and connected to the second-grade conveyor 46, and its upper end is located near the front end of the threshing cylinder 40, extending in an inclined manner with a higher front and lower rear. A winnowing conveyor 49 extending vertically is provided to the right of the reduction conveyor 48. The winnowing conveyor 49 conveys the first-grade grain from the first-grade conveyor 45 into the grain bin 10.

[0078] The combine harvester 1, equipped with the above structure, raises the harvesting section 3 to the desired height (the harvesting height of the ear stalk of the crop) in the field by the lifting action of the feeder 30 centered on the input shaft 38 of the harvesting section (support shaft), thereby changing from a non-operating state to an operating state and moving in this state using the traveling body 2. Thus, the combine harvester 1 uses the left and right tillers 33, 33 to divide the crop into harvestable and non-harvestable parts, while using the harrowing reel 34 to harrow the pod-bearing part of the ear stalk of the harvestable part and using the cutting device 32 to cut the pod-bearing part of the ear stalk.

[0079] The rotary-driven rake auger 37 rakes the pod-bearing parts of the ear stalks cut at the desired cutting position into the platform 31. The rake auger 37 then conveys the stalks, causing them to gather near the intake of the feeding chamber 35 within the platform 31 and be drawn into the feeding chamber 35. The conveyor 36 then carries the ear stalks from the feeding chamber 35 through it and feeds them into the threshing port 7a via the front rotating member 26, thus supplying them to the threshing section 7.

[0080] The threshing section 7 is used to thresh the pod-bearing parts of the ears of grain supplied to it. Specifically, the ears of grain supplied to the threshing section 7 are conveyed rearward by a rotating threshing cylinder 40, while threshing mainly takes place between the threshing cylinder 40 and the receiving net 42. Grains and other threshed materials smaller than the mesh size of the receiving net 42 leak downward from the receiving net 42. Straw fragments and other materials that do not leak downward from the receiving net 42 are conveyed by the threshing cylinder 40 and exit through the dust discharge port 8a (see reference) located at the rear of the screening section 8. Figure 5 It is discharged into the fields.

[0081] On the other hand, the screening section 8 is used to screen the grains that have been threshed by the threshing section 7 and have leaked downward from the receiving screen 42. Specifically, the threshed material that has been threshed by the threshing cylinder 40 and has leaked downward from the receiving screen 42 is screened by the gravity screening action of the oscillating screening device 43 and the wind screening action of the winnowing machine 47 into fine grains (first grade), a mixture of grains with branches and stalks and straw (second grade), and straw scraps, etc., and then removed.

[0082] Grains (first-grade) that fall from the oscillating screening device 43 after being screened by the screening section 8 are conveyed to the grain bin 10 by the first-grade conveyor 45 and the winnowing conveyor 49 connected thereto. Second-grade grains are returned to the threshing start side of the threshing cylinder 40 by the second-grade conveyor 46 and the reduction conveyor 48 connected thereto for further threshing. Straw scraps and other debris are discharged into the field from the dust outlet 8a located at the rear of the screening section 8.

[0083] Next, using Figure 4 The power transmission structure of the combine harvester 1 according to this embodiment will be described. The combine harvester 1 uses the rotational power of the engine 25 to drive the cutting section 3, the traveling section 4, the threshing section 7, the screening section 8, and the grain storage section 9.

[0084] The engine 25 has a first output shaft 25a and a second output shaft 25b. The rotational power of the first output shaft 25a is transmitted to the traveling section 4, the threshing section 7, the screening section 8, and the cutting section 3. The rotational power of the second output shaft 25b is transmitted to the grain storage section 9. In addition, the engine 25 has a work pump shaft that drives a booster pump 54 that operates the lifting cylinder 39, etc.

[0085] Regarding the power transmission system for the traveling section 4, the rotational power of the first output shaft 25a is transmitted to the HST input shaft 52 via the first belt drive mechanism 51, and input to the transmission 53, which includes both a traveling HST and a turning HST. Here, "HST" refers to a hydraulic continuously variable transmission (CVT) that uses a hydraulic motor to convert the hydraulic pressure generated by driving a hydraulic pump back into rotational force. The driving force of the transmission 53 drives the drive sprocket 5a of the track section 5 constituting the traveling section 4 to rotate.

[0086] Regarding the power transmission system for the threshing section 7, the rotational power of the first output shaft 25a is transmitted to the threshing section input shaft 56 via the second belt drive mechanism 55. The second belt drive mechanism 55 is equipped with a threshing clutch 57 that transmits the rotational power of the first output shaft 25a to the threshing section input shaft 56 intermittently.

[0087] The rotational power of the threshing section input shaft 56 is transmitted to the threshing cylinder input shaft 59 via a third belt drive mechanism 58. The rotational power of the threshing cylinder input shaft 59 is transmitted to the threshing cylinder shaft 41 via a threshing speed change device 60, using a first bevel gear 115 fixedly mounted on the threshing cylinder input shaft 59 and a second bevel gear 116 fixedly mounted on the threshing cylinder shaft 41. The threshing speed change device 60 performs two speed levels, for example, high speed and low speed, to change the rotational power input from the threshing cylinder input shaft 59 to the threshing cylinder shaft 41.

[0088] According to this structure, the driving force of the engine 25 is transmitted to the threshing section 7. Moreover, the power transmission to the threshing section 7 is engaged or disengaged by operating the working clutch lever provided on the driver's unit 15, thereby connecting or disengaging the threshing clutch 57.

[0089] Regarding the power transmission system for the screening section 8, the threshing section input shaft 56 has a support shaft for the winnowing machine 47. The rotational power of the threshing section input shaft 56 is transmitted to the pulley rotating body 63, which is supported on the intermediate threshing shaft 62, via a fourth belt drive mechanism 61. The rotational power of the pulley rotating body 63 is transmitted to the auxiliary winnowing machine 71 and the winnowing machine 47 via a predetermined transmission mechanism. In addition, the rotational power of the threshing section input shaft 56 is transmitted to the rotating shafts of the first-grade conveyor 45, the secondary fan 72, and the second-grade conveyor 46 via predetermined transmission mechanisms.

[0090] The rotational power of the first-grade conveyor 45 is transmitted to the winnowing conveyor 49 via a prescribed transmission mechanism. The rotational power of the second-grade conveyor 46 is transmitted to the swing shaft 44a of the swing mechanism 44 via the fifth belt drive mechanism 64. The rotational power of the second-grade conveyor 46 is transmitted to the reduction conveyor 48 via a bevel gear.

[0091] Regarding the power transmission system for the cutting section 3, the rotational power of the pulley rotating body 63 is transmitted to the forward rotating shaft 28 via the sixth belt drive mechanism 73. The sixth belt drive mechanism 73 is equipped with a cutting clutch 75 that transmits the rotational power of the pulley rotating body 63 to the forward rotating shaft 28 intermittently. The rotational power of the forward rotating shaft 28 is transmitted to the cutting section input shaft 38 via the first chain drive mechanism 65. The rotation of the cutting section input shaft 38 drives the conveyor 36 within the feeding chamber 35 to operate.

[0092] The rotational power of the harvesting section input shaft 38 is transmitted to the PF (platform) drive shaft 67 via the second chain drive mechanism 66. The rotational power of the PF drive shaft 67 is transmitted to the PF auger shaft 37a, which rotates the harrowing auger 37, via the third chain drive mechanism 68. Furthermore, the rotational power of the PF drive shaft 67 is transmitted to the cutter drive shaft 32a, which drives the cutter device 32, via the seventh belt drive mechanism 69. Additionally, the rotational power of the PF drive shaft 67 is transmitted to the reel shaft 34b, which rotates the harrowing reel 34, via the fourth chain drive mechanism 76, which includes the reel sub-shaft 70.

[0093] With this structure, the driving force of the engine 25 is transmitted to the cutting unit 3. Furthermore, the power transmission to the cutting unit 3 is engaged or disengaged by operating the working clutch lever provided on the driver unit 15 to engage / disengage the cutting clutch 75.

[0094] Regarding the power transmission system for the grain storage section 9, the rotational power of the second output shaft 25b is transmitted to the lower discharge conveyor 11 via a power transmission mechanism including the grain bin intermediate shaft 77, and the rotational power of the lower discharge conveyor 11 is transmitted to the longitudinal conveyor 12 via a bevel gear. The rotational power of the longitudinal conveyor 12 is transmitted to the grain discharge conveyor 13 via a predetermined transmission mechanism. Furthermore, as a structure for receiving and driving the rotational power of the grain bin intermediate shaft 77, the grain storage section 9 includes an exhaust fan 78 and a compressor 79.

[0095] As described above, the combine harvester 1 according to this embodiment includes: a threshing section 7 for threshing crops; a oscillating screening device 43 for screening the threshed material after threshing by the threshing section 7; and a winnowing machine 47 for supplying screening air to the oscillating screening device 43. Furthermore, the oscillating screening device 43 includes: a coarse screen 120 for screening the threshed material; and a grain screen 130 disposed below the coarse screen 120 for screening the threshed material after screening by the coarse screen 120.

[0096] Thus, regarding the combine harvester 1, the threshing device is configured to include: a winnowing fan 47, which supplies screening air to a oscillating screening device 43 that screens the threshed material (hereinafter also simply referred to as "the material") leaking downwards from the receiving net 42 of the threshing chamber 7b; and a grain sieve 130, which allows first-grade grains to leak downwards from the oscillating screening device 43. Hereinafter, using... Figures 5 to 11 The structure of the oscillating screening device 43 will be described.

[0097] The oscillating screening device 43 uses a frame 140, which is approximately rectangular in shape with the longitudinal direction as its long side when viewed from above, as the oscillating body, thereby forming an oscillating screening disc that oscillates in the longitudinal direction when viewed from above. The frame 140 has: left and right side plates 141; a front plate 142 disposed between the front ends of the left and right side plates 141; and a rear plate 143 disposed between the rear ends of the left and right side plates 141, and the aforementioned plate portions are configured into an approximately rectangular frame shape.

[0098] The side plate 141 is a long, strip-shaped plate with its long side extending from front to back. When viewed from the side, it has the following shape: the upper edge is horizontal, and the lower front edge is inclined, higher at the front and lower at the back. The side plate 141 has a vertical surface with its thickness extending from left to right, and has an inner surface 141a and an outer surface 141b. Various structures constituting the screening of the oscillating screening device 43 are provided between the left and right side plates 141.

[0099] like Figure 7 As shown, the oscillating screening device 43 is disposed between the left and right side plates 139, which are side walls provided from the threshing section 7 to the screening section 8. Moreover, the oscillating screening device 43 is configured such that the left and right side plates 141 of the frame 140 are formed parallel to the side plates 139 and are located near the left and right inner sides of the side plates 139.

[0100] The frame 140 is connected to the swing mechanism 44 on the lower side of the rear end. The swing mechanism 44 causes the frame 140 and the various screening structures supported on the frame 140 to swing together.

[0101] An upper grain tray 111 is provided at the front end between the left and right side plates 141. The upper grain tray 111 has a main body 111a composed of a plate-shaped component that is approximately horizontally mounted between the left and right side plates 141. The upper grain tray 111 is configured to be fixed to the left and right side plates 141 by means of fasteners such as bolts or by welding.

[0102] A guide plate 111b that acts on the grains is erected on the main body 111a of the upper grain disc 111. At the rear of the main body 111a, a plurality of sieve sections 111c, which are narrow, straight, plate-like sections constituting the rear portion of the upper grain disc 111, are arranged in a comb-like configuration and extend rearward (slanted upward). The plurality of sieve lines constituting the sieve section 111c are arranged at predetermined intervals in the left-right direction. The upper grain disc 111 receives the processed material falling from the receiving screen 42 and, as the oscillating screening device 43 oscillates, moves the processed material rearward while leveling it.

[0103] A lower grain disc 112 is provided below the upper grain disc 111 and below the front part of the coarse screen 120. The lower grain disc 112 is a bent plate-shaped component that is mounted between the left and right side plates 141. The lower grain disc 112 is fixed to the left and right side plates 141 by means of bolts or other fasteners or by welding.

[0104] The lower grain disc 112 has a front grain disc portion 112a and a rear grain disc portion 112b, which together with the front grain disc portion 112a form an obtuse angle and are formed into a curved shape when viewed from the side. The front grain disc portion 112a is a portion that slopes from front to back along the lower front edge of the side plate 141 when viewed from the side, and constitutes the front portion of the lower grain disc 112. The rear grain disc portion 112b is located below the front portion of the coarse sieve 120, is horizontal, and constitutes the rear portion of the lower grain disc 112. In the front-rear direction, the front portion of the lower grain disc 112 is located below the rear portion of the main body portion 111a of the upper grain disc 111, and the rear portion extends further rearward than the upper grain disc 111.

[0105] A sieve section 190 is provided on the rear side of the lower grain tray 112, in which multiple sieve lines 191 are arranged in a parallel configuration. The sieve section 190 is provided in the left-right direction over a substantially entire area covering the rear grain tray section 112b of the lower grain tray 112 (see reference). Figure 16 The sieve section 190 is composed of two sieve components 195 arranged adjacent to each other in the left-right direction (see reference). Figure 16 ).

[0106] The sieve component 195 is a bent plate-shaped component with a defined bent shape, having a fixed plate portion 192 and a sieve body portion 193 including a plurality of sieve wire portions 191, and the above portions are configured to form a bent shape with an obtuse angle when viewed from the side. The fixed plate portion 192 is a rectangular plate-shaped portion with the left-right direction as its long side. The sieve body portion 193 has: a base portion 194, which constitutes the leading edge portion of the sieve body portion 193; and a plurality of sieve wire portions 191, which extend rearward from the base portion 194, and the sieve body portion 193 has a comb-like shape.

[0107] The base 194 forms the protruding base of a plurality of sieve sections 191, connects to the rear side of the fixing plate section 192, and together with the fixing plate section 192 forms an obtuse-angled curved surface. The sieve section 191 is a narrow, straight portion extending from the base 194 in a predetermined direction. The plurality of sieve sections 191 are arranged at predetermined intervals in the left-right direction.

[0108] The sieve component 195 is fixed to the lower grain tray 112 at multiple locations by bolts 196 with the fixing plate portion 192 overlapping the rear edge of the lower grain tray 112. The bolts 196 pass through the fixing plate portion 192 of the sieve component 195 and the rear edge of the lower grain tray 112, and are screwed into the nut portion 197 located on the inner (lower) side of the rear grain tray portion 112b.

[0109] The sieve section 190 positions a plurality of sieve wire sections 191 between the front portion of the grain sieve 130 and the middle portion of the coarse sieve 120 in the front-rear direction. Regarding the sieve section 190, the plurality of sieve wire sections 191 are arranged in an inclined manner, with the rear higher than the front, in a manner that is generally parallel to the grain sieve 130 in its reference position. In the front-rear direction, the end portions (rear ends) of the plurality of sieve wire sections 191 are positioned above the front portion of the grain sieve 130 and are configured to cover approximately one-quarter of the front side of the grain sieve 130.

[0110] A coarse screen 120 is provided in the vertical direction at a height between the upper grain disc 111 and the lower grain disc 112. The coarse screen 120 is a structure used to coarsely screen the processed material and adjust the downward leakage of the processed material, and has coarse screen blades 121 as multiple blades.

[0111] The coarse screen blade 121 is a narrow rectangular plate-shaped component with its long side facing left and right, and is mounted between the left and right side plates 141 with an inclined orientation that is lower in the front and higher in the back. Multiple (e.g., more than twenty) coarse screen blades 121 constituting the coarse screen 120 are arranged in parallel at predetermined intervals in the front-to-back direction. The coarse screen 120 is configured to allow adjustment of the inclination angle of the multiple coarse screen blades 121.

[0112] The coarse screen 120 is positioned such that the front coarse screen blades 121 are located near the rear end of the upper grain disc 111 in the front-back direction, and the rear coarse screen blades 121 are located further back than the rear end of the grain screen 130. As the oscillating screening device 43 oscillates, the coarse screen 120 sieves the material conveyed from the upper grain disc 111 through gravity screening to separate the grains and impurities.

[0113] like Figure 15As shown, a front guide plate 145, with an inclined surface that slopes from the rear of the coarse sieve 120 to the lower part of the grain sieve 130, is provided towards the first-grade product conveyor 45. The front guide plate 145 is composed of a metal plate-shaped component and a rubber pendant made of an elastic material such as rubber. The front guide plate 145 guides the threshed material (first-grade product) falling from the grain sieve 130 to the first-grade product conveyor 45.

[0114] Two straw supports 135, a front straw support 135A and a rear straw support 135B, are provided behind the coarse screen 120. The two straw supports 135 are located at the rear or rear end between the left and right side plates 141. The straw support 135 is composed of a plurality of straw support components 136 arranged at predetermined intervals in the left and right direction.

[0115] The straw support component 136 is a plate-shaped component with an alternating concave-convex shape on its upper side, and is configured such that its front end is fixed to the support component 137 erected between the left and right side plates 141. The straw support component 136 of the rear straw support 135B extends rearward, and its length in the front-to-back direction is longer than that of the straw support component 136 of the front straw support 135A. The front end of the straw support component 136 of the rear straw support 135B is located below the rear end of the straw support component 136 of the front straw support 135A, and the front and rear straw supports 135 are configured to be continuous in the front-to-back direction.

[0116] The straw support 135 performs gravity screening on the threshed material conveyed from the coarse screen 120. The straw support 135 is configured to allow the lighter secondary products (grains with branches, cut ears of grain, etc.) in the threshed material to flow downstream, and to discharge straw and other materials to the outside of the harvester.

[0117] Below the front and rear straw supports 135, a rear guide plate 146 is provided, forming an inclined surface that is lower in the front and higher in the back, facing the secondary product conveyor 46. The rear guide plate 146 is composed of a metal plate-shaped component and a rubber pendant made of an elastic material such as rubber. The rear guide plate 146 guides the threshed material falling from the straw supports 135 to the secondary product conveyor 46.

[0118] The grain sieve 130 receives the grains threshed by the threshing section 7 and is installed in the oscillating screening device 43 as a sieve section for screening first-grade products. Above the grain sieve 130 is a coarse sieve 120 with multiple coarse sieve blades 121, which further screens the processed material after screening by the coarse sieve 120. The grain sieve 130 is located above the first-grade product conveyor 45 and divides the conveying destination of the processed material into the first-grade product conveyor 45 and the second-grade product conveyor 46.

[0119] like Figure 15and Figure 16 As shown, the grain sieve 130 is a nearly flat plate-shaped component with a nearly rectangular plate-like shape. The grain sieve 130 has a width dimension (the dimension in the left-right direction) corresponding to the spacing between the left and right side plates 141, 141, and is provided in the left-right direction over a generally integral area covering the left and right side plates 141, 141.

[0120] The grain sieve 130 includes a plate-shaped grain sieve body 161 through which a plurality of holes 163 for screening the processed material are formed. The grain sieve body 161 is a generally flat, porous portion constituting the entirety of the grain sieve 130, which has a rectangular shape.

[0121] A plurality of through holes 163 are formed throughout most of the main body 161 of the grain sieve, excluding the front and rear edges. The multiple holes 163 are arranged in a two-dimensional grid pattern, substantially following the rectangular shape of the grain sieve 130. The grain sieve 130 utilizes the set of holes 163 to allow grains that should be stored in the grain bin 10 to fall out, and to allow impurities other than grains to remain on the grain sieve 130. The holes 163 have a rounded, approximately square or approximately rectangular opening shape. However, the opening shape of the holes 163 is not particularly limited.

[0122] The grain sieve 130 has its front and rear edges of the grain sieve body 161 as non-forming parts of the perforation 163. Regarding the grain sieve 130, lateral curved surfaces 164 are formed on the left and right sides of the grain sieve body 161, which bend downward at right angles from the left and right ends of the grain sieve body 161.

[0123] The grain sieve 130 is positioned such that its front end is located below the rear end of the rear grain disc portion 112b of the lower grain disc 112. Additionally, the grain sieve 130 is positioned such that its rear end is located near the rear end of the coarse sieve 120.

[0124] The adjustment mechanism for the tilt angle of the plurality of coarse screen blades 121 of the coarse screen 120 will be described. As a component supporting the plurality of coarse screen blades 121 from the left and right sides, the coarse screen 120 has a mounting side plate 122 and a connecting side plate 123. Both the mounting side plate 122 and the connecting side plate 123 are narrow plate-shaped components extending along the tilt direction of the coarse screen 120 when viewed from the side, and are arranged parallel to each other such that the mounting side plate 122 is on the upper side and the connecting side plate 123 is on the lower side.

[0125] The mounting side plate 122 is configured to be fixed to the side plate 141 of the oscillating screening device 43 by means of bolts 124 (see reference). Figure 8 The fixing parts based on bolts 124 are provided at multiple locations at predetermined intervals in the extending direction of the mounting side plate 122.

[0126] like Figure 8 As shown, the mounting side plate 122 has: a fixing face 122a, which overlaps with the side plate 141 from the inner face 141a side and allows the bolt 124 to pass through; an inclined face 122b, which is formed by bending in an inclined shape from the lower side of the fixing face 122a to the left and right inner sides; and a supporting face 122c, which is a face extending downward from the lower side of the inclined face 122b and parallel to the fixing face 122a, and the aforementioned faces are formed with a cross-sectional shape that is bent in an approximately crank shape. The bolt 124 passes through the fixing face 122a of the mounting side plate 122 and the side plate 141 from the left and right inner sides and is screwed into the nut portion 125 provided on the outer face 141b side of the side plate 141.

[0127] The connecting side plate 123 is connected to the mounting side plate 122 via multiple coarse screen blades 121 and is configured to be movable. Each coarse screen blade 121 is supported on the left and right sides of its upper edge by means of an upper rotating shaft 126 with the left and right directions as the axis. The upper rotating shaft 126 protrudes outward from the left and right ends of the coarse screen blades 121 and passes through the support surface 122c of the mounting side plate 122. The upper rotating shaft 126 is rotatably supported on the mounting side plate 122 by a locking member such as a locking pin (not shown) that passes through the protruding part protruding from the support surface 122c.

[0128] Furthermore, each coarse screen blade 121 is supported on the left and right connecting side plates 123 on both sides of its lower edge, in a manner that allows it to rotate via a lower rotating shaft 127 with the left and right direction as the axis. The lower rotating shaft 127 protrudes outward from both ends of the coarse screen blade 121 and passes through the connecting side plate 123. The lower rotating shaft 127 is rotatably supported on the connecting side plate 123 by a locking member such as a locking pin (not shown) that passes through the protruding portion protruding from the connecting side plate 123.

[0129] In this way, the upper rotation shaft 126 relative to the mounting side plate 122 is set as a fixed support shaft, and the lower rotation shaft 127 relative to the connecting side plate 123 is set as a movable support shaft, thereby supporting the coarse screen blades 121 assembly of the coarse screen 120, and connecting them on the movable side via the connecting side plate 123. Moreover, the coarse screen blades 121 assembly rotates while maintaining a parallel state with each other as the connecting side plate 123 connected to the lower rotation shaft 127 moves back and forth.

[0130] Regarding this structure, the connecting side plate 123 moves in the front-to-back direction, causing each coarse screen blade 121 to rotate around the rotation axis 126, thereby changing the tilt angle (hereinafter referred to as the "coarse screen angle") of the coarse screen blade group 121. The coarse screen 120 receives an operation to change the coarse screen angle, i.e., an operation to move the connecting side plate 123 back and forth, for a specific operating blade 121A located at the front of the coarse screen 120 among the multiple coarse screen blades 121. This operation becomes a rotation operation centered on the rotation axis 126 above the operating blade 121A.

[0131] As described above, the coarse screen 120, which is located above the grain screen 130 in the oscillating screening device 43, includes a plurality of coarse screen blades 121 that are configured to adjust the tilt angle, and is configured to adjust the downward leakage amount of the threshed material according to the tilt angle (coarse screen angle) of the plurality of coarse screen blades 121.

[0132] On the outer side (left side) of the left side plate 141L, a coarse screen angle adjustment part 150 that functions to operate the operating blade 121A is provided (see reference). Figure 9 As an operating component for adjusting the coarse screening angle, the coarse screening angle adjustment unit 150 has a coarse screening operating arm 151 provided on the outer side 141b of the side plate 141L.

[0133] like Figure 10 As shown, the coarse screening operating arm 151 has a forearm portion 151a and a rear arm portion 151b, which are formed into an approximately right-angled bent shape with the upper side being the convex side when viewed from the side. Both the forearm portion 151a and the rear arm portion 151b are composed of a long strip-shaped plate member with the thickness direction in the left-right direction.

[0134] The coarse screening operating arm 151 is configured to rotate integrally with the left-right direction as the rotation axis via a first arm support shaft 153 provided on the bent portion (top) of the front arm portion 151a and the rear arm portion 151b. That is, the coarse screening operating arm 151 is configured as an integral rotating body by means of the front arm portion 151a and the rear arm portion 151b, such that the angle formed by the aforementioned arm portions is constant and it rotates around the first arm support shaft 153. The first arm support shaft 153 is provided coaxially with the upper rotation shaft 126 of the operating blade 121A and becomes a fixed support shaft in the coarse screening operating arm 151.

[0135] The forearm portion 151a extends forward and downward from the first arm support shaft 153, and the rear arm portion 151b extends backward and downward from the first arm support shaft 153. Furthermore, the rear arm portion 151b has an arm length approximately 2 to 3 times that of the forearm portion 151a.

[0136] The end of the forearm portion 151a on the opposite side (end side) of the first arm support shaft 153 is connected to the lower rotation shaft 127 of the operating blade 121A via a second arm support shaft 154 with the left-right direction as the axial direction. The second arm support shaft 154 and the lower rotation shaft 127 of the operating blade 121A are coaxially arranged such that the left and right outer (left) portions are connected to the end portion of the forearm portion 151a, and the left and right inner (right) portions are connected to the lower rotation shaft 127 of the operating blade 121A.

[0137] Based on the above structure, the coarse screening operating arm 151 rotates around the first arm support shaft 153 (see reference). Figure 10 (Arrow A1), thereby enabling the operating blades 121A to rotate around the upper rotation shaft 126 via the second arm support shaft 154. As a result, the coarse screen blades 121 group connected by the side plate 123 rotate around the upper rotation shaft 126, thereby causing the coarse screen angle to change.

[0138] The coarse screening angle is adjusted by adjusting the position (rotation position) of the coarse screening operating arm 151 around the rotation direction of the first arm support shaft 153. The rotation position of the coarse screening operating arm 151 is fixed by bolts 156 that pass through and screw into the bolt holes 155 provided in the side plate 141L on the opposite side (end side) of the rear arm portion 151b to the first arm support shaft 153. Multiple bolt holes 155 are provided to fix the coarse screening operating arm 151 in different rotation positions. The rotation position, i.e., the coarse screening angle, of the coarse screening operating arm 151 is adjusted by selecting the bolt holes 155 used to fix the coarse screening operating arm 151.

[0139] like Figure 10 As shown, when viewed from the left, the coarse screening operating arm 151 is positioned further to the right (refer to arrow B1), that is, the end of the rear arm portion 151b is positioned further down, while the second arm support shaft 154 is positioned further forward and upward (refer to arrow C1). This causes the coarse screening blades 121 to tilt, and the gap between adjacent coarse screening blades 121 to narrow. Conversely, when viewed from the left, the coarse screening operating arm 151 is positioned further to the left (refer to arrow B2), that is, the end of the rear arm portion 151b is positioned further up, while the second arm support shaft 154 is positioned further back and lower (refer to arrow C2). This causes the coarse screening blades 121 to stand upright, and the gap between adjacent coarse screening blades 121 to widen.

[0140] In this embodiment, screw holes 155 are provided at five locations: the first to the fifth screw holes 155A to 155E, allowing the coarse screen angle to be adjusted in five levels. The first screw hole 155A is the screw hole 155 that causes the coarse screen blades 121 to be tilted at their maximum angle. The coarse screen blades 121 are formed in an upright state from the first screw hole 155A in the order of the second screw hole 155B, the third screw hole 155C, the fourth screw hole 155D, and the fifth screw hole 155E.

[0141] Figure 10 The state shown is the state in which the coarse screening operating arm 151 is fixed using the third screw hole portion 155C. Figure 11 Figure A shows the state in which the first screw hole portion 155A is fixed for the coarse screening operating arm 151, i.e., the state in which the coarse screening blades 121 are tilted at their maximum extent. Additionally, Figure 11 Figure B shows the state where the coarse screen operating arm 151 is fixed using the fifth screw hole 155E, that is, the state where the coarse screen blade 121 is erected at its maximum extent. Furthermore, in Figure 11 A and Figure 11 In the figures of B, the coarse screen operating arm 151, which is fixed by the third screw hole 155C, is shown by the double-dotted line.

[0142] Regarding the formation of the five screw holes 155, based on the hole diameter of the screw holes 155, the size of the adjustment angle of one level of the coarse screening angle (approximately 3° in this embodiment), the arm length of the rear arm 151b, etc., to avoid interference between the screw holes 155, the five screw holes 155 are arranged such that their radial positions on the circumference centered on the rotation center O1 of the coarse screening operating arm 151, which is aligned with the axis of the first arm support shaft 153, are different. Therefore, regarding the penetration position of the bolt 156 relative to the rear arm 151b, the penetration position in the length direction of the rear arm 151b varies depending on the screw holes 155 used. To accommodate this variation in the penetration position of the bolt 156 relative to the rear arm 151b, an elongated hole 151c is formed in the rear arm 151b along the length direction of the rear arm 151b as a hole through which the bolt 156 passes.

[0143] As described above, the coarse screening angle of the coarse screen 120 can be adjusted using the coarse screening angle adjustment unit 150. In particular, in this embodiment, based on the arrangement of the five screw holes 155 as described above, it is possible to achieve adjustments to the coarse screening angle at five levels with finer angle intervals.

[0144] like Figure 6As shown, a front guide plate 145, with an inclined surface that slopes from the rear of the coarse sieve 120 to the lower part of the grain sieve 130, is provided towards the first-grade product conveyor 45. The front guide plate 145 is composed of a metal plate-shaped component and a rubber pendant made of an elastic material such as rubber. The front guide plate 145 guides the threshed material (first-grade product) falling from the grain sieve 130 to the first-grade product conveyor 45.

[0145] Two straw supports 135, a front straw support 135A and a rear straw support 135B, are provided behind the coarse screen 120. The two straw supports 135 are located at the rear or rear end between the left and right side plates 141. The straw support 135 is composed of a plurality of straw support components 136 arranged at predetermined intervals in the left and right direction.

[0146] The straw support component 136 is a plate-shaped component with an alternating concave-convex shape on its upper side, and is configured such that its front end is fixed to the support component 137 erected between the left and right side plates 141. The straw support component 136 of the rear straw support 135B extends rearward, and its length in the front-to-back direction is longer than that of the straw support component 136 of the front straw support 135A. The front end of the straw support component 136 of the rear straw support 135B is located below the rear end of the straw support component 136 of the front straw support 135A, and the front and rear straw supports 135 are configured to be continuous in the front-to-back direction.

[0147] The straw support 135 performs gravity screening on the threshed material conveyed from the coarse screen 120. The straw support 135 is configured to allow the lighter secondary products (grains with branches, cut ears of grain, etc.) in the threshed material to flow downstream, and to discharge straw and other materials to the outside of the harvester.

[0148] Below the front and rear straw supports 135, a rear guide plate 146 is provided, forming an inclined surface that is lower in the front and higher in the back, facing the secondary product conveyor 46. The rear guide plate 146 is composed of a metal plate-shaped component and a rubber pendant made of an elastic material such as rubber. The rear guide plate 146 guides the threshed material falling from the straw supports 135 to the secondary product conveyor 46.

[0149] The grain sieve 130 receives the grains threshed by the threshing section 7 and is installed in the oscillating screening device 43 as a sieve section for screening first-grade products. Above the grain sieve 130 is a coarse sieve 120 with multiple coarse sieve blades 121, which further screens the processed material after screening by the coarse sieve 120. The grain sieve 130 is located above the first-grade product conveyor 45 and divides the conveying destination of the processed material into the first-grade product conveyor 45 and the second-grade product conveyor 46.

[0150] like Figure 6and Figure 7 As shown, the grain sieve 130 is a nearly flat plate-shaped component with a nearly rectangular plate-like shape. The grain sieve 130 has a width dimension (the dimension in the left-right direction) corresponding to the spacing between the left and right side plates 141, 141, and is provided in the left-right direction over a generally entire area between the left and right side plates 141, 141.

[0151] The grain sieve 130 includes a plate-shaped grain sieve body 161 through which a plurality of holes 163 for screening the processed material are formed. The grain sieve body 161 is a generally flat, porous portion constituting the entirety of the grain sieve 130, which has a rectangular shape.

[0152] A plurality of through holes 163 are formed throughout most of the main body 161 of the grain sieve, excluding the front and rear edges. The plurality of through holes 163 are arranged in a two-dimensional grid pattern, substantially along the rectangular shape of the grain sieve 130. The grain sieve 130 uses the set of through holes 163 to allow grains that should be stored in the grain bin 10 to fall off, and to allow impurities other than grains to remain on the grain sieve 130. The through holes 163 have a rounded, approximately square or approximately rectangular opening shape. However, the opening shape of the through holes 163 is not particularly limited.

[0153] The grain sieve 130 has its front and rear edges of the grain sieve body 161 as non-forming parts of the perforation 163. Regarding the grain sieve 130, lateral curved surfaces 164 are formed on the left and right sides of the grain sieve body 161, which bend downward at right angles from the left and right ends of the grain sieve body 161.

[0154] The grain sieve 130 is positioned such that its front end is located below the rear end of the rear grain disc portion 112b of the lower grain disc 112. Additionally, the grain sieve 130 is positioned such that its rear end is located near the rear end of the coarse sieve 120.

[0155] Regarding the above structure, the grain sieve 130 is configured to rotate so that the upwind side (front side) of the screening air is moved up and down using the downwind side (rear side) of the screening air from the winnowing machine 47 as a support shaft 138. That is, the grain sieve 130 is a component that is approximately flat, configured to be straight with a lower front and higher rear when viewed from the side, and is designed to rotate with the downstream side (rear side of the machine body) of the screening air in the direction of conveying the processed material as a fulcrum (support shaft). The support structure of the grain sieve 130 will be described below.

[0156] Regarding the support shaft 138, the grain sieve 130 is supported at its rear edge by a support shaft 170 mounted between the left and right side plates 141, allowing it to rotate. The support shaft 170 is a straight rod-shaped component with a circular cross-section along its left-right axis, and is fixed to the left and right side plates 141.

[0157] As an engaging portion relative to the support shaft 170, the grain sieve 130 has a shaft engaging portion 165 located on the rear side of the grain sieve main body 161. The shaft engaging portion 165 is a curved surface that is arc-shaped when viewed from the side (viewed axially along the support shaft 170), and is formed as an approximately cylindrical portion extending in the left-right direction. The shaft engaging portion 165 is formed in the left-right direction over the entire rear edge of the grain sieve main body 161.

[0158] As a portion that extends out of the plate-shaped part constituting the grain sieve body 161 and bends downward relative to the grain sieve body 161, the shaft engaging portion 165 is formed to be continuous relative to the grain sieve body 161. The grain sieve 130 holds the support shaft 170 in such a way that the shaft engaging portion 165 passes through it and engages with the support shaft 170.

[0159] In this way, the grain sieve 130 is configured to rotate within a specified angle range by using the support shaft 138 located on its rear side to set the support shaft 170 as a fulcrum (support shaft) and thus moving its front side up and down (see reference). Figure 6 (Arrow D1). In Figure 6 In the diagram, regarding the vertical rotation of the grain sieve 130 based on the support shaft 138, the grain sieve 130 in the upward position is shown by a single dashed line, and the grain sieve 130 in the downward position is shown by a double dashed line. As this is only one example, the grain sieve 130 is positioned at a reference position with an inclination angle of approximately 10° relative to the horizontal direction, forming a shape that is lower in the front and higher in the back, and is configured to rotate within a range of ±5° in the vertical direction relative to this reference position.

[0160] With the grain sieve 130 in the rising position, the front end of the grain sieve 130 is located directly below the rear end of the rear grain disc portion 112b of the lower grain disc 112, and the lower grain disc 112 and the grain sieve 130 are formed to be substantially continuous in the front-back direction. That is, with the grain sieve 130 in the rising position, the grain sieve 130 is configured to extend rearward along an extension line of the rear grain disc portion 112b of the horizontally positioned lower grain disc 112.

[0161] Furthermore, with the grain sieve 130 in its reference position, a step difference is created between the rear end of the lower grain disc 112 and the front end of the grain sieve 130. This step difference forms a space that draws in screening air from the winnowing machine 47 between the lower grain disc 112 and the grain sieve 130 and guides the screening air upwards onto the grain sieve 130. Moreover, when the grain sieve 130 is in its descending position, the step difference is at its maximum, and the amount of screening air drawn in relative to the upper side of the grain sieve 130 increases.

[0162] Furthermore, the support structure of the grain sieve 130 based on the support shaft portion 138 is not limited to this embodiment. In this embodiment, the shaft engagement portion 165 is provided in the left-right direction over the entire area of ​​the grain sieve body portion 161, but the shaft engagement portion 165 may also be provided in a partial area in the left-right direction, or may be provided in multiple locations. In addition, as a structure of the support shaft portion 138, for example, it may be a structure in which a shaft portion with the left-right direction as the axial direction is provided on the side of the grain sieve 130, and the shaft portion is supported so that it can rotate relative to the side plate 141, thereby supporting the grain sieve 130 in a rotatable manner on the frame 140.

[0163] As described above, regarding the grain sieve 130 configured to rotate vertically by using the support shaft 138 to make the rear end a rotation center and thus allowing the front side to move vertically, the front support portion is configured as an operating support portion 180 for rotating the grain sieve 130 (see reference). Figure 9 ).

[0164] like Figure 9 As shown, the operating support 180 is provided on the outer side of the left side plate 141L. As an operating component for adjusting the rotation angle (hereinafter referred to as the "grain sieve angle") centered on the support shaft 138 of the grain sieve 130, the operating support 180 has an operating arm 181 provided on the outer side 141b of the side plate 141L. The operating arm 181 is located below the coarse sieve operating arm 151.

[0165] The operating arm 181 has a lower arm portion 181a and an upper arm portion 181b, which are formed into an obtuse-angled bend shape with the front side protruding when viewed from the side. The operating arm 181 is composed of a plate-shaped member having a bend shape based on the elongated portion of each arm portion forming the lower arm portion 181a and the upper arm portion 181b in the left-right direction as the plate thickness direction.

[0166] The operating arm 181 is configured to rotate integrally with the left-right direction as the rotation axis by means of an arm shaft support 183 provided on the bent portion (top) of the lower arm portion 181a and the upper arm portion 181b. That is, the operating arm 181 is configured as an integral rotating body by means of the lower arm portion 181a and the upper arm portion 181b, such that the angle formed by the above-mentioned arm portions is constant and it rotates around the arm shaft support 183. The arm shaft support 183 is configured to support the operating arm 181 on the side plate 141L in a manner that allows it to rotate around a predetermined rotation axis P1.

[0167] The lower arm 181a extends downward (rearward) from the arm shaft support 183, and the upper arm 181b extends upward from the arm shaft support 183. Furthermore, the lower arm 181a has approximately 1.5 times the arm length of the upper arm 181b. Additionally, the operating support 180 is configured not to interfere with the coarse screening operating arm 151 within its rotational range.

[0168] The arm shaft support 183 is located near the horizontal lower edge 141c of the side plate 141L, and the operating arm 181 extends the lower arm 181a further downward than the lower edge 141c of the side plate 141L. The end of the lower arm 181a on the opposite side (end side) of the arm shaft support 183 is connected to the front end of the grain sieve 130 by means of a grain sieve support shaft 184 with the left-right direction as the axial direction.

[0169] The grain sieve 130 extends downward beyond the lower edge 141c of the side plate 141L. At the exposed front end extending downward from the side plate 141L, a grain sieve support shaft 184 is connected, through which the end portion of the lower arm 181a passes. The grain sieve 130 is supported on the lower arm 181a by the grain sieve support shaft 184 in a manner that allows it to rotate in the left-right direction.

[0170] The grain sieve support shaft 184 includes: a shaft body portion 184a, which is a connecting portion relative to the grain sieve 130; and a flange portion 184b, which is disposed on the left and right outer sides (left side) of the shaft body portion 184a and is an enlarged diameter portion relative to the shaft body portion 184a. The grain sieve support shaft 184 has the shaft body portion 184a configured as a through portion relative to the lower arm portion 181a, such that the flange portion 184b is located on the left and right outer sides of the lower arm portion 181a.

[0171] Based on the structure above, such as Figure 9 As shown, the operating arm 181 rotates around the arm shaft support 183 (around the rotation axis P1) (refer to arrows E1 and E2), thereby causing the grain sieve 130 to rotate around the support shaft 138 via the grain sieve support shaft 184 (refer to arrows F1 and F2), thus changing the angle of the grain sieve. Figure 9 In the image, the grain sieve 130 and the operating arm 181 in the upward operation state are shown by double-dotted lines.

[0172] Regarding the rotation of the interlocking operating arm 181 and grain sieve 130, the grain sieve support shaft 184 moves relative to the lower arm portion 181a in a manner that changes the distance between it and the arm shaft support portion 183. To allow for this change in the through position of the grain sieve support shaft 184 relative to the lower arm portion 181a, an elongated hole 181c is formed in the lower arm portion 181a along its length direction as a hole through which the grain sieve support shaft 184 passes.

[0173] The angle of the grain sieve is adjusted by rotating the operating arm 181 around the arm shaft support 183. The rotation of the operating arm 181 is performed by operating the grain sieve operating component 185, which is connected to the operating arm 181 via the operating wire 171. The grain sieve operating component 185 is an operating component used to rotate the grain sieve 130 up and down around the support shaft 138 by means of the operating arm 181.

[0174] The wire 171 is a so-called push-pull wire, having: an inner wire 172, which is a wire body having wire ends at both ends; and an outer tube 173, which is a cover member that substantially covers the inner wire 172 except for the two ends.

[0175] The outer tube 173 is fixed to designated locations at multiple points. Figure 9 In the example shown, the portion near one end of the outer tube 173 is supported by a wire support 174 provided on the outer surface 141b of the side plate 141L. The inner wire 172 is configured to be movable relative to the outer tube 173, which is fixed in a fixed state.

[0176] One end of the inner wire 172 is connected to the end of the upper arm portion 181b of the operating arm 181. The wire end 175, located at one end of the inner wire 172, is axially supported at the end of the upper arm portion 181b by means of a locking shaft 176, allowing it to rotate around the locking shaft 176. Furthermore, the locking shaft 176 is located on either side of the upper arm portion 181b and the wire end 175, supporting the other side so that it can rotate.

[0177] The wire 171 extends forward from the connection relative to the operating arm 181 and is arranged along a predetermined path toward the driver's compartment 15. The other end of the inner wire 172 is connected to the grain sieve operating member 185 via a wire end not shown. The grain sieve operating member 185 is, for example, an operating lever configured for tilting operation, and is located near the driver's compartment 15 or a position where the operator can operate from within the driver's compartment 15.

[0178] Regarding the above structure, the inner wire 172 is pushed and pulled by the operation of the grain sieve operating component 185. The pushing and pulling action of the inner wire 172 causes the operating arm 181 to rotate around the arm shaft support 183. As a result, the grain sieve 130 connected to the operating arm 181 rotates around the support shaft 138.

[0179] like Figure 9As shown, when viewed from the left, the operation of the grain sieve operating component 185 causes the operating arm 181 to rotate to the left (refer to arrow E1), thereby causing the grain sieve 130 to rotate about the support shaft 138 in a direction that raises the front end (refer to arrow F1). Conversely, when viewed from the left, the operating arm 181 rotates to the right (refer to arrow E2), thereby causing the grain sieve 130 to rotate about the support shaft 138 in a direction that lowers the front end (refer to arrow F2).

[0180] like Figure 6 and Figure 7 As shown, the oscillating screening device 43 has a lower grain disc 112, which is provided on the front side of the grain sieve 130 and receives the threshed material that leaks down from the coarse sieve 120. Furthermore, a sieve section 190 with a plurality of sieve lines 191 arranged in parallel is provided on the rear side of the lower grain disc 112.

[0181] The sieve section 190 is provided in the left-right direction over the entire area of ​​the rear grain disc section 112b covering the lower grain disc 112 (see reference). Figure 7 Therefore, the sieve section 190 is provided in the left-right direction over a generally entire area between the side plates 141 extending to the left and right. The sieve section 190 is composed of two sieve components 195 arranged adjacent to each other in the left-right direction (see reference). Figure 7 ).

[0182] The sieve component 195 is a bent plate-shaped component with a defined bent shape, having a fixed plate portion 192 and a sieve body portion 193 including a plurality of sieve lines 191, and the above portions are configured to form a bent curve shape that is obtuse in side view.

[0183] The fixing plate portion 192 is a rectangular plate-shaped portion with the left and right directions as its long sides, and the left and right dimensions are set to approximately half the left and right dimensions of the grain sieve 130. The sieve body portion 193 has: a base portion 194, which constitutes the front edge of the sieve body portion 193; and a plurality of sieve wire portions 191, which extend rearward from the base portion 194, and the sieve body portion 193 has a comb-like shape.

[0184] The base 194 is a plate-shaped portion formed in the same range as the fixed plate 192 in the left-right direction, and constitutes the protruding base of a plurality of sieve wire portions 191. The base 194 is connected to the rear side of the fixed plate 192 and together with the fixed plate 192 forms an obtuse-angled curved surface. The sieve wire portion 191 is a narrow, straight portion extending from the base 194 in a predetermined direction. The plurality of sieve wire portions 191 and the base 194 are formed coplanarly and arranged at predetermined intervals in the left-right direction.

[0185] The sieve component 195 constituting the sieve section 190 has a fixing plate portion 192 fixedly supported on the rear edge of the lower grain tray 112, i.e., the rear edge of the rear grain tray portion 112b. The sieve component 195 is fixed to the lower grain tray 112 by bolts 196 with the fixing plate portion 192 overlapping on the rear edge of the lower grain tray 112. The bolts 196 pass through the fixing plate portion 192 of the sieve component 195 and the rear edge of the lower grain tray 112, and are screwed into the nut portion 197 provided on the inner (lower) side of the rear grain tray portion 112b. Regarding each sieve component 195, the fixing portion based on the bolts 196 is provided at three locations in the left-right direction: at both ends and the center of the fixing plate portion 192.

[0186] The sieve section 190 positions a plurality of sieve wire sections 191 between the front portion of the grain sieve 130 and the middle portion of the coarse sieve 120 in the front-rear direction. Regarding the sieve section 190, the plurality of sieve wire sections 191 are arranged in an inclined shape, higher at the rear and lower at the front, in a manner approximately parallel to the grain sieve 130 which is in a reference position. Figure 6 In the example shown, the angle formed by the multiple sieve sections 191 relative to the horizontal direction is, for example, about 10°. Furthermore, the magnitude of the inclination angle of the sieve sections 191 relative to the horizontal direction is not particularly limited.

[0187] The sieve section 190 is positioned such that the ends (rear ends) of the plurality of sieve wire sections 191 are located above the front of the grain sieve 130 in the front direction, and are configured to cover approximately 1 / 4 of the front side of the grain sieve 130. Furthermore, the extension length of the plurality of sieve wire sections 191 is not particularly limited.

[0188] As described above, regarding the oscillating screening device 43, a sieve section 190 is provided above the front of the grain sieve 130, consisting of two sieve components 195 mounted on the rear side of the lower grain tray 112. Furthermore, in this embodiment, the sieve section 190 is composed of two sieve components 195 arranged adjacent to each other in the left-right direction, but the number of sieve components 195 constituting the sieve section 190 is not limited. The sieve section 190 may also be composed of a single sieve component or multiple sieve components of three or more.

[0189] Furthermore, regarding the grain sieve 130, the combine harvester 1 has the following structure. Specifically, in the screening section 8, a swing screening device 43 is disposed between the left and right side plate sections 139, and the left outer side plate section 139L of the left and right side plate sections 139 has an opening 200 that, when viewed from the side, includes at least a portion of the grain sieve 130 within its opening range (see reference). Figure 12 ).

[0190] like Figure 12As shown, the opening 200 is a through hole that opens to the outside of the space between the left and right side plate portions 139. The opening 200 is formed in the side plate portion 139L at a location corresponding to the grain sieve 130. The opening 200 has a front-to-back direction ( Figure 12 The opening shape is an approximately rounded rectangle in the length direction (left and right directions).

[0191] The opening 200 has a horizontal upper edge 200a and a lower edge 200b along the front-to-back direction as its opening edge. At the opening edge of the opening 200, the rear side of the lower edge 200b forms an inclined edge 200c that is lower in the front and higher in the rear. The opening 200 is formed such that the lower edge 141c of the side plate 141L of the oscillating screening device 43 is located approximately at the center of its opening range in the vertical direction.

[0192] The opening 200 has a longitudinal length sufficient to allow the grain sieve 130 to pass through. That is, the grain sieve 130 is configured to enter and exit relative to its installation location via the opening 200. The opening 200 is used for the installation / removal, internal inspection, and maintenance of the grain sieve 130.

[0193] The opening 200 is positioned such that its front opening edge is directly in front of the operating arm 181 that supports the grain sieve 130, and its rear opening edge is located near the front side of the support shaft 138 of the grain sieve 130. The opening 200 is formed such that, when viewed from the left, it includes the entire or substantially the entire operating arm 181 within its opening area. Furthermore, when viewed from the left, the opening 200 includes, within its opening area, the entire protruding portion of the grain sieve 130 extending downward from the lower edge 141c of the side plate 141L.

[0194] The opening 200 is typically closed by a cover 210. The cover 210 is designed to be detachable from the side panel 139L. The cover 210 is constructed of a nearly rectangular plate-shaped component with its long side in the left-right direction, and is configured to include the opening range of the opening 200 within its overall shape. Bent edges 212, formed by right-angle bends relative to the flat cover body 211 towards the left and right (left side) sides of the upper and lower edges of the rectangular shape of the cover 210, are provided throughout the entire front-back direction.

[0195] like Figure 12 and Figure 13 As shown, the cover 210 is fixed to the side plate portion 139L by bolts 215 at the four corners or near the corners of its rectangular shape. The bolts 215 pass through the cover body portion 211 and the side plate portion 139L of the cover 210 and are screwed into the nut portion 216 provided on the inner (right) side surface 139a of the side plate portion 139L.

[0196] Thus, the opening 200 is configured to be opened and closed using a cover 210, which is detachable relative to the side plate 139L, via bolts 215. By loosening the bolts 215 and removing the cover 210, the grain sieve 130 can be operated through the opening 200.

[0197] In this embodiment, the opening 200 is formed such that, when viewed from the side, the entire grain sieve 130 is located within the opening area. However, it may also be formed such that the entire grain sieve 130 is located within the opening area, including the rotation range of the grain sieve 130. Furthermore, regarding the cover 210, by constructing the cover 210 wholly or partially from a transparent plate, it can be structured such that, with the cover 210 installed, the interior of the sieving section can be visually inspected from the outside via the opening 200.

[0198] In addition, Figure 12 In the image, cover 210 is indicated by a double-dotted line. Additionally, in... Figure 13 The image shows the cover 210 and bolt 215 in the disassembled state, while the cover 210 and bolt 215 in the installed state are shown by double-dotted lines.

[0199] According to the combine harvester 1 of this embodiment with the above structure, the screening accuracy of the screening unit 8 for the threshed material can be improved.

[0200] Regarding the oscillating screening device 43, the grain sieve 130 is configured to rotate up and down around the support shaft 138. With this structure, the tilt angle (grain sieve angle) of the grain sieve 130 can be changed according to the amount of material being processed. Therefore, the grain sieve angle can be adjusted according to the amount of material being processed, the crop conditions of the target crop, the variety, etc., thereby improving the screening accuracy of the material being processed.

[0201] When the flow rate of the processed material is high, increasing the inclination angle of the grain sieve 130 (making the inclination steeper) can increase the step difference between the lower grain disc 112 and the grain sieve 130, and also increase the airflow from the winnowing machine 47 that is drawn onto the grain sieve 130 from the front side. Therefore, the falling distance of the processed material from the lower grain disc 112 onto the grain sieve 130 can be extended, thus prolonging the contact time with the screening air and improving the screening effect.

[0202] Furthermore, by increasing the tilt angle of the grain sieve 130, the movement of the processed material that overcomes the tilt on the grain sieve 130 can be suppressed, thus promoting the downward leakage of the processed material from the grain sieve 130. This increases the recovery rate of first-grade products by the first-grade product conveyor 45. Moreover, even with a large quantity of processed material, the downward leakage of first-grade products from the grain sieve 130 can be ensured, preventing a decrease in screening accuracy.

[0203] On the other hand, when the flow rate of the processed material is low, reducing the tilt angle of the grain sieve 130 (making the slope gentler) can promote the movement of the processed material moving on the grain sieve 130, thus suppressing the leakage of the processed material downward from the grain sieve 130. Consequently, by keeping the accumulated material on the grain sieve 130 at a constant level, excess space in the grain sieve 130 can be reduced, thus reducing the occurrence of impurities such as chopped stalks falling from the grain sieve 130. As a result, the screening accuracy of the processed material can be improved.

[0204] Thus, the combine harvester 1 equipped with the oscillating screening device 43 according to this embodiment can achieve improved screening accuracy and handle screening of multiple varieties by means of a structure that can adjust the inclination of the grain sieve 130, even though it is a compact structure.

[0205] Furthermore, regarding the oscillating screening device 43, a plurality of sieve sections 190 with parallel sieve lines 191 are provided on the rear side of the lower grain disc 112. According to this structure, the sieve sections 190, located above the front of the grain sieve 130, perform sieving of the material passing down from the coarse sieve 120 and the material conveyed from the lower grain disc 112, as the oscillating screening device 43 oscillates. Thus, in conjunction with the angle adjustment of the grain sieve 130, which has a variable tilt angle, the screening accuracy can be effectively improved.

[0206] Furthermore, an opening 200 is provided on the side plate portion 139L of the screening section 8. With this structure, by opening the outer cover on the left side of the motor body 2 and removing the cover 210, the condition of the grain sieve 130 can be observed through the opening 200. That is, the opening 200 can be used as a viewing window for the grain sieve 130, allowing the angle and other properties of the grain sieve 130 to be observed through the opening 200. Additionally, since all or part of the cover 210, which closes the opening 200, is made of a transparent plate, the condition of the grain sieve 130 can be visually observed even with the cover 210 installed.

[0207] Furthermore, the grain sieve 130 can be installed / removed and maintained through the opening 200 without removing the oscillating screening device 43 from the machine body side. This improves the operability of maintenance operations such as the grain sieve 130, thus maintaining the screening and conveying performance of the grain sieve 130 with simple operations. In addition, the oscillating screening device 43 is configured to be typically installed / removed from the traveling machine body 2 through the opening 202 covered by the rear cover 201 that covers the lower part of the rear side of the traveling machine body 2 (see reference). Figure 5 ).

[0208] (A variation of the swing screening device)

[0209] use Figure 14 The structure of a modified example of the swing screening device 43 according to this embodiment will be described.

[0210] As described above, the oscillating screening device 43 includes a coarse screen 120 disposed above the grain screen 130 and used to screen the threshed material. The coarse screen 120 includes a plurality of coarse screen blades 121 whose tilt angle can be adjusted, and is configured to adjust the downward leakage amount of the threshed material according to the tilt angle (coarse screen angle) of the plurality of coarse screen blades 121. Regarding this structure, in this modified example, the grain screen 130, which is configured to rotate about the support shaft 138, is configured to rotate in conjunction with the change of the coarse screen angle.

[0211] like Figure 14 As shown, the coarse screening operating arm 151, which is used to adjust the coarse screening angle, and the grain screen 130 are connected to each other by the connecting arm 220. The connecting arm 220 is a long strip-shaped plate with a straight shape in the left-right direction as the plate thickness direction, and is provided on the left side of the left side plate 141L.

[0212] The connecting arm 220 is connected to the end of the forearm portion 151a of the coarse screening operating arm 151 via the arm shaft support 221, with one end (upper side) along its length direction connected to the end of the forearm portion 151a. The arm shaft support 221 supports the connecting arm 220 and the forearm portion 151a so that they can rotate relative to each other via a support shaft 222 with the left-right direction as its axial direction. The support shaft 222 and the second arm support shaft 154 (see reference...) Figure 10 It is set on the same axis. In addition, as a shaft component constituting the support shaft 222, it can share the shaft component constituting the second arm support shaft 154.

[0213] The connecting arm 220 connects its other (lower) end in the longitudinal direction to the front end of the grain sieve 130 via the grain sieve support shaft 204. The connecting arm 220 supports the grain sieve 130 via the grain sieve support shaft 204 so that it can rotate in the left-right direction as the rotation axis.

[0214] The grain sieve support shaft 204 includes: a shaft body portion 204a, which is a connecting portion relative to the grain sieve 130; and a flange portion 204b, which is disposed on the left and right outer sides (left side) of the shaft body portion 204a and is an enlarged diameter portion relative to the shaft body portion 204a. The grain sieve support shaft 204 has the shaft body portion 204a configured as a through portion relative to the connecting arm 220, such that the flange portion 204b is located on the left and right outer sides of the connecting arm 220.

[0215] Based on the structure above, such as Figure 14As shown, the coarse screening operating arm 151 rotates around the first arm support shaft 153 (refer to arrows G1 and G2), thereby causing the grain screen 130 to rotate around the support shaft 138 via the connecting arm 220 (refer to arrows H1 and H2), thus changing the angle of the grain screen.

[0216] like Figure 14 As shown, when viewed from the left, the coarse sieve operating arm 151 rotates to the left (refer to arrow G1), causing the coarse sieve blades 121 to rotate towards the side where they are upright, and causing the grain sieve 130 to rotate about the support shaft 138 in the direction that lowers the front end, i.e., increases the grain sieve angle (refer to arrow H1). Conversely, when viewed from the left, the coarse sieve operating arm 151 rotates to the right (refer to arrow G2), causing the coarse sieve blades 121 to rotate towards the side where they are tilted, and causing the grain sieve 130 to rotate about the support shaft 138 in the direction that raises the front end, i.e., decreases the grain sieve angle (refer to arrow H2).

[0217] In this way, the grain sieve 130 rotates in conjunction with the change in the coarse sieve angle based on the operation of the coarse sieve operating arm 151, thereby changing the grain sieve angle. That is, the coarse sieve operating arm 151 and the connecting arm 220 constitute a linkage mechanism 230 that changes the grain sieve angle according to the coarse sieve angle. Therefore, the grain sieve angle is automatically adjusted along with the adjustment of the coarse sieve angle based on the selection of the screw hole portion 155 for fixing the coarse sieve operating arm 151 as described above.

[0218] In this embodiment, the coarse sieve angle can be adjusted in five levels using the first to fifth screw holes 155A to 155E, which are selected when fixing the rotation of the coarse sieve operating arm 151. Therefore, the grain sieve angle can be adjusted in five levels according to the fixed position of the coarse sieve operating arm 151.

[0219] like Figure 11 As shown in Figure A, when the first screw hole 155A is used to fix the coarse sieve operating arm 151, the coarse sieve blades 121 are tilted to their maximum extent. Correspondingly, the grain sieve 130 is in a state where its end side is at the rising end during rotation around the support shaft 138, i.e., the grain sieve angle is at its minimum. Furthermore, as... Figure 11 As shown in B, when the fifth screw hole 155E is used to fix the coarse sieve operating arm 151, the coarse sieve blade 121 is raised to its maximum extent. Correspondingly, the grain sieve 130 is raised to the maximum extent when the end side is in the downward end during the rotation operation centered on the support shaft 138.

[0220] As described above, the grain sieve 130 is configured to rotate around the support shaft 138. Based on the structure that causes the grain sieve 130 to rotate in conjunction with the change in the coarse sieve angle of the coarse sieve 120, the grain sieve angle can be automatically adjusted according to the change in the coarse sieve angle based on the adjustment of the coarse sieve angle.

[0221] For example, when processing a large quantity of material, adjusting the coarse screening operating arm 151 to a fixed position based on the fourth screw hole portion 155D and the fifth screw hole portion 155E increases the coarse screening angle and widens the spacing between the multiple coarse screening blades 121, and also increases the grain screening angle, thereby increasing the downward leakage of processed material from both the coarse screening 120 and the grain screening 130. Conversely, when processing a small quantity of material, adjusting the coarse screening operating arm 151 to a fixed position based on the first screw hole portion 155A and the second screw hole portion 155B decreases the coarse screening angle and narrows the spacing between the multiple coarse screening blades 121, and also decreases the grain screening angle, thereby reducing the downward leakage of processed material from both the coarse screening 120 and the grain screening 130.

[0222] In this way, the linkage mechanism 230 between the coarse screen 120 and the grain screen 130 can simultaneously adjust the angles of both the coarse screen and the grain screen according to the amount of material to be processed and the crop conditions, thereby improving the screening accuracy.

[0223] The above-described embodiments are one example of the present invention, and the present invention is not limited to the above-described embodiments. Therefore, even embodiments other than those described above, as long as they do not depart from the technical concept involved in the present invention, can of course be modified according to design, etc. In addition, the effects described in this disclosure are merely examples and are not limited; other effects may also be achieved.

[0224] In the above embodiment, the combine harvester 1 is a conventional combine harvester; however, the present invention can also be applied to other combine harvesters, such as self-tapping combine harvesters.

[0225] In the above embodiments, a structure is adopted to rotate the grain sieve 130 using the wire 171, or a structure is adopted to rotate the grain sieve 130 in conjunction with the change of the coarse sieve angle of the coarse sieve 120. However, the following structure can also be used to adjust the coarse sieve angle and the grain sieve angle.

[0226] That is, such as Figure 5 As shown, the structure is as follows: a stalk detection unit 300 for detecting stalks is provided in the screening section 8, and the coarse sieve angle and grain sieve angle are controlled based on the detection results of the stalk detection unit 300. Figure 5In the example shown, the stalk detection unit 300 is located near the dust discharge port 8a located at the rear of the screening section 8. The stalk detection unit 300 includes, for example, a detection body 301 that rotates under the action of discharged straw or the like discharged from the threshing chamber 7b to the dust discharge port 8a; and a detection switch 302 that switches the connection on / off according to the rotation of the detection body 301.

[0227] The detection body 301 is an approximately rectangular plate-shaped component, supported at its upper edge by a support shaft 303 with the front-to-back direction as the axial direction, and configured to rotate left and right around the axis of the support shaft 303. The support shaft 303 is mounted between the rear wall 7d of the threshing section 7 and a predetermined support member located in front of it. The detection body 301 is equipped with: a switch operating plate that activates the detection switch 302 by causing the detection body 301 to rotate by a predetermined amount; and an elastic body such as a spring that applies force to hold the detection body 301 at a predetermined detection reference position (all figures omitted). The detection switch 302 is electrically connected to the control unit 310 of the combine harvester 1, and the signal from the detection switch 302 is input to the control unit 310.

[0228] Regarding this structure, when the amount of straw discharged into the dust outlet 8a exceeds a constant amount, the detection body 301 rotates against the force of the elastic body, causing the detection switch 302 to be turned on via the action of the switch operating plate, and the control unit 310 recognizes the on signal. In this case, the flow rate of the processed material is relatively high, therefore, the control unit 310 automatically adjusts the flow by increasing the angles of the coarse screen and the grain screen, respectively. As a result, the downward leakage of the processed material from both the coarse screen 120 and the grain screen 130 increases.

[0229] On the other hand, when the amount of straw discharged into the dust outlet 8a is constant or less than constant, the detector 301 is rotated to the detection reference position by means of the elastic body, and the switch operation plate does not act on the detection switch 302, causing the detection switch 302 to be in an open state. The control unit 310 recognizes the open signal (no on signal is detected). In this case, the flow rate of the processed material is relatively low. Therefore, the control unit 310 automatically adjusts the flow rate by reducing the angle of the coarse sieve and the angle of the grain sieve, respectively. As a result, the downward leakage of the processed material from the coarse sieve 120 and the grain sieve 130 is reduced.

[0230] In adjusting the coarse sieve angle and grain sieve angle using this stalk detection unit 300, the set values ​​for each of the coarse sieve angle and grain sieve angle corresponding to the on / off signals of the detection switch 302 are preset and stored in the control unit 310. In this configuration, the coarse sieve angle and grain sieve angle are adjusted in two levels based on the on / off state of the detection switch 302. Furthermore, for example, by using a potentiometer as the stalk detection unit 300, a detection range of three or more levels can be set regarding the amount of stalk discharged to the dust discharge port 8a. This allows for control of adjusting the coarse sieve angle and grain sieve angle in three or more levels based on each detection range, and stepless adjustment of the coarse sieve angle and grain sieve angle based on the amount of stalk discharged.

[0231] Furthermore, as described above, regarding the structure for rotating the grain sieve 130 using the wire 171 (see...) Figure 9 The following structure can be adopted in self-tapping combine harvesters.

[0232] Regarding the self-threshing combine harvester, the threshing section includes: a threshing drum with its front-to-back direction as the axis of rotation; and a stalk feeding device located on the left side of the threshing drum. The stalk feeding device clamps the root of the stalk cut by the cutting section and feeds the stalk backward in a horizontal position with the stalk tip on the side of the threshing drum. The stalk feeding device is configured to include: a feeding chain wound around a plurality of sprockets with their left-to-right direction as the axis of rotation; and a stalk feeding clamp (clamping guide) that cooperates with the feeding chain to clamp the root of the stalk.

[0233] The clamping guide is designed to move in the clamping direction (vertical direction) of the straw, and its vertical position changes according to the amount of straw being clamped (the thickness of the straw layer). This clamping guide is connected to the arm that rotates the coarse screen blades using wire, and is configured to adjust the coarse screen angle according to the amount of straw being clamped and conveyed.

[0234] Regarding this structure, one end of the wire that will cause the grain sieve to rotate (e.g.) Figure 9 The other end of the wire 171 shown is connected to a wire or the operating part of the wire that links the clamping guide and the coarse screen together, thereby enabling it to rotate together with the grain screen in conjunction with the clamping guide and the coarse screen. With this structure, the inclination of the grain screen can be automatically adjusted along with the angle of the coarse screen according to the amount of ear straw conveyed in the ear straw supply device, thereby improving the screening accuracy.

[0235] The support structure of the grain sieve 130 will be described. The grain sieve 130 is configured to allow the downwind side (rear side) of the screening air from the winnowing machine 47 to move up and down using the support shaft 138 as the support shaft. That is, the grain sieve 130 is an approximately flat plate-shaped component, which is a straight line with a lower front and a higher rear when viewed from the side, and is configured to rotate with the downstream side (rear side of the machine body) of the screening air in the direction of conveying the processed material as the fulcrum (support shaft).

[0236] The grain sieve 130 can be rotatably supported on the support shaft 138 by means of the support shaft 170 mounted between the left and right side plates 141. The support shaft 170 is a straight rod-shaped component with a circular cross-section along the left and right direction as the axial direction, and is fixed to the left and right side plates 141.

[0237] As an engaging portion relative to the support shaft 170, the grain sieve 130 has a shaft engaging portion 165 located on the rear side of the grain sieve main body 161. The shaft engaging portion 165 is a curved surface that is arc-shaped when viewed from the side (viewed axially along the support shaft 170), and is formed as an approximately cylindrical portion extending in the left-right direction. The shaft engaging portion 165 is formed in the left-right direction over the entire rear edge of the grain sieve main body 161.

[0238] As a portion that extends out of the plate-shaped part constituting the grain sieve body 161 and bends downward relative to the grain sieve body 161, the shaft engaging portion 165 is formed to be continuous with the grain sieve body 161. The grain sieve 130 holds the support shaft 170 in such a way that the shaft engaging portion 165 passes through it and engages with the support shaft 170.

[0239] In this way, the grain sieve 130 is configured to rotate within a specified angle range by using the support shaft 138 located on its rear side as a fulcrum (support shaft) to allow the front side to move up and down (see reference). Figure 15 (Arrow D1). In Figure 15 In the diagram, regarding the vertical rotation of the grain sieve 130 based on the support shaft 138, the grain sieve 130 in the upward position is shown by a single dashed line, and the grain sieve 130 in the downward position is shown by a double dashed line. While this is just one example, the grain sieve 130 is positioned at an angle of approximately 10° relative to the horizontal, with its front lower and rear higher position set as a reference position, and is configured to rotate within a range of ±5° in the vertical direction relative to this reference position.

[0240] With the grain sieve 130 in the rising position, the front end of the grain sieve 130 is located directly below the rear end of the rear grain disc portion 112b of the lower grain disc 112, and the lower grain disc 112 and the grain sieve 130 are formed to be substantially continuous in the front-back direction. That is, with the grain sieve 130 in the rising position, the grain sieve 130 is configured to extend rearward along an extension line of the rear grain disc portion 112b of the horizontally positioned lower grain disc 112.

[0241] Furthermore, with the grain sieve 130 in its reference position, a step difference is formed between the rear end of the lower grain disc 112 and the front end of the grain sieve 130. This step difference creates a space between the lower grain disc 112 and the grain sieve 130, and guides the screening air from the winnowing machine 47 upwards onto the grain sieve 130. Moreover, the step difference is greatest when the grain sieve 130 is in its descending position, resulting in a greater amount of screening air intake relative to the upper side of the grain sieve 130.

[0242] Furthermore, the support structure of the grain sieve 130 based on the support shaft portion 138 is not limited to this embodiment. In this embodiment, the shaft engagement portion 165 is provided in the left-right direction over the entire area of ​​the grain sieve body portion 161, but the shaft engagement portion 165 may be provided in a partial or multiple locations in the left-right direction. In addition, as a structure of the support shaft portion 138, for example, it can be a structure in which a shaft portion with the left-right direction as the axial direction is provided on the side of the grain sieve 130, and the shaft portion is supported so that it can rotate relative to the side plate 141, thereby supporting the grain sieve 130 in a rotatable manner on the frame 140.

[0243] As described above, the grain sieve 130, which is rotatable by moving its front side up and down with the support shaft 138 as the center, is configured to rotate in conjunction with changes in the coarse sieve angle. Hereinafter, using... Figure 18 and Figure 19 The linkage structure of the coarse sieve 120 and the grain sieve 130 is explained.

[0244] like Figure 18 As shown, the oscillating screening device 43 has a linkage mechanism 230 that changes the rotation angle (hereinafter referred to as "grain sieve angle") centered on the support shaft 138 of the grain sieve 130 according to the coarse sieve angle.

[0245] The linkage mechanism 230 includes: a coarse screening operating arm 151, which is an operating component for adjusting the coarse screening angle; and a connecting arm 220, which connects the coarse screening operating arm 151 and the grain sieve 130 to each other. The coarse screening operating arm 151 and the connecting arm 220 are both located on the outside of the left side plate 141L of the left side plate 141 (left side).

[0246] like Figure 19 As shown, the coarse screening operating arm 151 has a forearm portion 151a and a rear arm portion 151b, which are arranged in a nearly right-angled bent shape with the upper side being the convex side when viewed from the side. Both the forearm portion 151a and the rear arm portion 151b are composed of a long strip-shaped plate member with the thickness direction in the left-right direction.

[0247] The coarse screening operating arm 151 is configured to rotate integrally in the left-right direction using a first arm support shaft 153 provided on the bent portion (top) of the front arm portion 151a and the rear arm portion 151b. That is, the coarse screening operating arm 151 is configured as an integral rotating body using the front arm portion 151a and the rear arm portion 151b, such that the angle of the arm portion configuration is constant and it rotates around the first arm support shaft 153. The first arm support shaft 153 is coaxially mounted with the upper rotation shaft 126 of the operating blade 121A and serves as a fixed support shaft in the coarse screening operating arm 151.

[0248] The forearm portion 151a extends forward and downward from the first arm support shaft 153, and the rear arm portion 151b extends backward and downward from the first arm support shaft 153. Furthermore, the rear arm portion 151b has an arm length approximately 2 to 3 times that of the forearm portion 151a.

[0249] The end of the forearm portion 151a on the opposite side (end side) of the first arm support shaft 153 is connected to the lower rotation shaft 127 of the operating blade 121A via a second arm support shaft 154 with the left-right direction as the axial direction. The second arm support shaft 154 and the lower rotation shaft 127 of the operating blade 121A are coaxially arranged such that the left and right outer (left) portions are connected to the end portion of the forearm portion 151a, and the left and right inner (right) portions are connected to the lower rotation shaft 127 of the operating blade 121A.

[0250] Based on the above structure, the coarse screening operating arm 151 rotates around the first arm support shaft 153 (see reference). Figure 19 (Arrow A1), thereby causing the operating blades 121A to rotate around the upper rotation shaft 126 via the second arm support shaft 154. Consequently, the coarse screen blades 121 group, connected by the side plate 123, rotate around the upper rotation shaft 126, causing the coarse screen angle to change. The coarse screen angle is adjusted by adjusting the position (rotation position) of the coarse screen operating arm 151 around the first arm support shaft 153 in the direction of rotation.

[0251] like Figure 19As shown, when viewed from the left, the coarse screening operating arm 151 is positioned further to the right (refer to arrow B1), that is, the end of the rear arm portion 151b is positioned further down, while the second arm support shaft 154 is positioned further forward and upward (refer to arrow C1). This causes the coarse screening blades 121 to tilt, and the gap between adjacent coarse screening blades 121 to narrow. Conversely, when viewed from the left, the coarse screening operating arm 151 is positioned further to the left (refer to arrow B2), that is, the end of the rear arm portion 151b is positioned further up, while the second arm support shaft 154 is positioned further back and lower (refer to arrow C2). This causes the coarse screening blades 121 to stand upright, and the gap between adjacent coarse screening blades 121 to widen.

[0252] The connecting arm 220 is composed of a long, plate-shaped component with a straight profile extending from left to right along its thickness. The connecting arm 220 is connected at one end (upper side) along its length to the end of the forearm portion 151a of the coarse screening operating arm 151 via an arm shaft support 221. The arm shaft support 221 supports the connecting arm 220 and the forearm portion 151a so that they can rotate relative to each other using a support shaft 222 with its axial direction extending from left to right. The support shaft 222 and the second arm support shaft 154 (see reference) Figure 19 It is set on the same axis. In addition, as a shaft component constituting the support shaft 222, it can share the shaft component constituting the second arm support shaft 154.

[0253] The connecting arm 220 is connected to the front end of the grain sieve 130 via the grain sieve support shaft 204 on the other side (lower side) in the longitudinal direction (see reference). Figure 18 The connecting arm 220 supports the grain sieve 130 with the grain sieve support shaft 204 so that it can rotate in the left-right direction as the rotation axis.

[0254] like Figure 18 As shown, the grain sieve support shaft 204 has: a shaft body portion 204a, which is a connecting portion relative to the grain sieve 130; and a flange portion 204b, which is an enlarged diameter portion of the shaft body portion 204a located on the left and right outer sides (left side) of the shaft body portion 204a. The grain sieve support shaft 204 has the shaft body portion 204a configured as a through portion relative to the connecting arm 220, such that the flange portion 204b is located on the left and right outer sides of the connecting arm 220.

[0255] Based on the structure above, such as Figure 18 As shown, the coarse screening operating arm 151 rotates around the first arm support shaft 153 (refer to arrows G1 and G2), thereby causing the grain screen 130 to rotate around the support shaft 138 via the connecting arm 220 (refer to arrows H1 and H2), thus changing the angle of the grain screen.

[0256] like Figure 18As shown, when viewed from the left, the coarse sieve operating arm 151 rotates to the left (refer to arrow G1), causing the coarse sieve blades 121 to rotate towards the side where they are upright, and causing the grain sieve 130 to rotate about the support shaft 138 in the direction that lowers the front end, i.e., increases the grain sieve angle (refer to arrow H1). Conversely, when viewed from the left, the coarse sieve operating arm 151 rotates to the right (refer to arrow G2), causing the coarse sieve blades 121 to rotate towards the side where they are tilted, and causing the grain sieve 130 to rotate about the support shaft 138 in the direction that raises the front end, i.e., decreases the grain sieve angle (refer to arrow H2).

[0257] In this way, the grain sieve 130 rotates in conjunction with the change in the coarse sieve angle based on the operation of the coarse sieve operating arm 151, thereby changing the grain sieve angle. That is, the coarse sieve operating arm 151 and the connecting arm 220 constitute a linkage mechanism 230 that changes the grain sieve angle according to the coarse sieve angle. As described above, the oscillating screening device 43 is configured using the linkage mechanism 230 to automatically adjust the grain sieve angle of the grain sieve 130 in accordance with the adjustment (operation) of the coarse sieve angle of the coarse sieve 120.

[0258] The coarse screening angle and the grain screening angle are adjusted by rotating the coarse screening operating arm 151 around the first arm support shaft 153. The rotation of the coarse screening operating arm 151 is achieved by the operation of the angle adjustment device 300, which is connected to the coarse screening operating arm 151 by means of the wire 171, which serves as the operating wire.

[0259] like Figure 18 and Figure 20 As shown, the angle adjustment device 300 includes: a motor 301, which is an actuator; a gear arm 302, which receives power from the motor 301 and performs an action; and a bracket 303, which supports the above components. The bracket 303 is a bent plate-shaped component with an approximately rectangular flat plate portion as the bracket body portion 303a, supporting the motor 301 and the gear arm 302 on the bracket body portion 303a. The motor 301 and the gear arm 302 are disposed on the same plate surface side relative to the bracket body portion 303a.

[0260] Motor 301 is an electric motor. A small-diameter gear 304 that meshes with the gear portion 302b of gear arm 302 is fixedly mounted on the output shaft 301a of motor 301. Motor 301 is fixed to one side of the long side of bracket body 303a by means of mounting plate 305 and fasteners such as bolts, with the axial direction of output shaft 301a facing the thickness direction of bracket body 303a. Figure 21 The lower part (middle section). The motor 301 is electrically connected to the control unit 50 of the combine harvester 1 (see reference). Figure 23 ), and accepts the action control of the control unit 50.

[0261] The gear arm 302 is a plate-shaped component with the output shaft 301a along its thickness direction. It has: a gear portion 302a with an approximately fan-shaped shape, which has an arc-shaped peripheral portion as a gear portion 302b; and an arm portion 302c that protrudes radially outward from the center of the gear arm 302. The gear arm 302 has a cylindrical shaft support portion 302d located at the center of the circumference along which the gear portion 302b is located. When the gear support shaft 306, which is provided on the bracket body portion 303a, is inserted into the shaft support portion 302d by means of bearing components such as bushings, the support is such that it can rotate relative to the bracket 303 about the gear support shaft 306.

[0262] Regarding the gear arm 302, a wire support shaft 307 for receiving the connection of the wire 171 is provided at the end of the arm portion 302c. The wire support shaft 307 extends through the arm portion 302c with the plate thickness direction of the gear arm 302 as the axial direction. In the bracket body portion 303a, a hole 303b through which the wire support shaft 307 extends allows the wire support shaft 307 to move with the rotation of the gear arm 302 centered on the shaft support portion 302d. Therefore, it is formed as an elongated hole curved along an arc.

[0263] The other end of the wire 171 is connected to a protruding portion of the wire support shaft 307 that protrudes outward from the bracket body 303a via the hole 303b. The gear arm 302 is an operating component for rotating the grain sieve 130 up and down around the support shaft 138 by means of the wire 171, the coarse screening operating arm 151, and the connecting arm 220.

[0264] The wire 171 is a so-called push-pull wire, having: an inner wire 172, which is a wire body having wire ends at both ends; and an outer tube 173, which is a cover member that substantially covers the inner wire 172 except for the two ends.

[0265] The outer tube 173 is fixed to designated locations at multiple points. Figure 18 In the example shown, the portion near one end of the outer tube 173 is supported by a wire support 174 provided on the outer surface 141b of the side plate 141L. The inner wire 172 is configured to be movable relative to the outer tube 173, which is set to a fixed state.

[0266] One end of the inner wire 172 is connected to the end of the rear arm portion 151b of the coarse screening operating arm 151. The wire end 175, located at one end of the inner wire 172, is supported at the end of the rear arm portion 151b by means of a locking shaft 176, allowing it to rotate around the locking shaft 176. Furthermore, the locking shaft 176 is located on either side of the rear arm portion 151b and the wire end 175, and is supported such that either side can rotate.

[0267] The wire 171 extends from the connection relative to the coarse screening operating arm 151 and is configured along a predetermined path, such that the other end is connected to the angle adjustment device 300. The portion near the end of the other end of the outer tube 173 is supported by a wire support member 311 that protrudes from the outside of the bracket body 303a of the bracket 303 (opposite to the configuration side of the gear arm 302).

[0268] The other end of the inner wire 172 is connected to the arm portion 302c of the gear arm 302. The inner wire 172 is such that the wire end 177 located on its other end is rotatably connected to the wire support shaft portion 307 located at the end of the arm portion 302c of the gear arm 302 on the outside of the bracket body portion 303a.

[0269] Regarding the above structure, the output shaft 301a is rotated in a predetermined direction or its opposite direction by the drive of the motor 301, thereby causing the gear arm 302 to rotate around the gear support shaft 306 via the small diameter gear 304. As a result, the inner wire 172 is pushed and pulled by the arm portion 302c, causing the coarse screening operating arm 151 to rotate around the first arm support shaft 153, thus changing the coarse screening angle. Furthermore, as the coarse screening operating arm 151 rotates, the connecting arm 220 moves vertically, and the grain sieve 130 connected to the connecting arm 220 rotates around the support shaft portion 138, thus changing the grain sieve angle.

[0270] The angle adjustment device 300 is configured to be installed on either side plate portion 139 of the left and right side plate portions 139, which are positioned between each other by the oscillating screening device 43. In this embodiment, the angle adjustment device 300 is configured to be installed on the outer side of the left and right side plate portions 139L, which is the outer side of the left side plate portion 139L on the side where the linkage mechanism 230 is configured (see reference). Figure 21 ).

[0271] exist Figure 21 In the example shown, the angle adjustment device 300 is positioned at a location overlapping the front end of the coarse screen 120 when viewed from the left. Furthermore, the mounting position of the angle adjustment device 300 on the side plate portion 139 is not limited. The angle adjustment device 300 is configured such that the bracket 303 supporting the motor 301 and gear arm 302 is fixed to the outer side (left side) relative to the side plate portion 139L.

[0272] The bracket 303 has, on one side of the bracket body 303a in the short-side direction, a side portion 331, which is formed at a right angle from the bracket body 303a toward the arrangement side of the gear arm 302; and a fixing portion 332, which is formed at a right angle to the side portion 331 and bends outward. Additionally, on the other side of the bracket body 303 in the long-side direction, both ends of the bracket 303 have support strips 333 and 334 that are provided in a tab-like manner relative to the bracket body 303a. Each support strip 333 and 334 has a side portion and a fixing portion that are formed together with the bracket body 303a in a crank-shaped bend, similar to the side portion 331 and the fixing portion 332.

[0273] The bracket 303 is fixed to the side plate 139L at three locations using fasteners such as bolts 335, with the fixing surfaces of ...

[0274] As described above, the combine harvester 1 has a motor 301 in the screening section 8 that changes the tilt angle (coarse screening angle) and grain screening angle of the plurality of coarse screening blades 121 provided on the left side plate section 139L. The motor 301 is mounted on the side plate section 139L by means of a bracket 303.

[0275] A coarse screening angle detection sensor 341 is provided in the angle adjustment device 300. The coarse screening angle detection sensor 341 is a rotary potentiometer with a rotating shaft, which is connected to one end of the detection arm 342. The coarse screening angle detection sensor 341 detects the rotational position (rotation amount) of the detection arm 342, and detects the rotational position (rotation amount) of the gear arm 302 by means of the detection arm 342.

[0276] The coarse screening angle detection sensor 341 is disposed on the same side as the gear arm 302 relative to the bracket body 303a, and is fixed to the bracket body 303a at multiple locations using fasteners 343 such as bolts. The coarse screening angle detection sensor 341 is disposed on the opposite side of the bracket body 303a relative to the long side of the bracket body 303a, opposite to the side where the motor 301 is disposed.

[0277] The coarse screening angle detection sensor 341 keeps the detection arm 342 in constant contact with the wire support shaft 307, and detects the rotation of the gear arm 302 as the detection arm 342 rotates. That is, the coarse screening angle detection sensor 341 detects the coarse screening angle using the detection arm 342, the gear arm 302, the wire 171, and the coarse screening operating arm 151. Furthermore, regarding the structure where the grain screening angle changes with the change in the coarse screening angle using the linkage mechanism 230, the grain screening angle is detected together with the coarse screening angle using the coarse screening angle detection sensor 341, based on the correspondence between the coarse screening angle and the grain screening angle.

[0278] [Second Implementation]

[0279] use Figure 15 , Figures 22 to 24 The second embodiment of the present invention will be described. For example... Figure 15 As shown, the combine harvester 1 has a processing material quantity detection sensor 350 in the screening section 8 to detect the amount of threshed material on the coarse screen 120. The processing material quantity detection sensor 350 is positioned above the middle part of the coarse screen 120 in the front-to-back direction.

[0280] like Figure 22 As shown, the processing quantity detection sensor 350 has a sensor body 351, a detection plate 352, and a reset plate 353. The processing quantity detection sensor 350 uses the sensor body 351 to detect the rotational position (rotation amount) of the detection plate 352, and detects the amount of threshed material on the coarse screen 120 based on the detected value.

[0281] The sensor body 351 is a rotary potentiometer with a rotating shaft 351a. The detection plate 352 is a plate-shaped component with an approximately crank-like buckling shape, so that when viewed axially along the rotating shaft 351a of the sensor body 351, its buckling shape is oriented such that one end (the upper end) is connected to the rotating shaft 351a.

[0282] The reset plate 353 is a plate-shaped component with a predetermined buckling or bending shape, which is integrated with the detection plate 352 so that it is oriented in the direction of its buckling or bending shape when viewed along the axial direction of the rotation axis 351a of the sensor body 351. The detection plate 352 and the reset plate 353 constitute an integrated rotating body 354 about the rotation axis 351a. The reset plate 353 functions as a counterweight for the rotating body 354 to return it to a predetermined initial position by gravity when no external force is applied (in its natural state).

[0283] The detection plate 352 is configured such that, with the rotating body 354 in its initial position, the end of the other end (lower end) is positioned above the upper end of the coarse screen blades 121 of the coarse screen 120 at a predetermined distance relative to the rotation about the rotation axis 351a. Here, the predetermined distance is set to a distance that prevents the detection plate 352 and the reset plate 353 from interfering (contacting) with the coarse screen blades 121 during the oscillating screening action of the oscillating screening device 43.

[0284] According to the processing material quantity detection sensor 350 with the above structure, the threshed material flowing from the front of the coarse screen 120 presses against the detection plate 352, thereby causing the rotating body 354 to rotate rearward from its initial position according to the amount of threshed material (fluid pressure) (see reference). Figure 22 (arrow R1). Moreover, if the pressing action on the rotating body 354 based on the threshed material is released, the weight of the reset plate 353 causes the rotating body 354, i.e. the detection plate 352, to return to its initial position.

[0285] like Figure 22 As shown, the processing quantity detection sensor 350 is mounted on the left and right side plate portions 139 via a mounting plate 355, forming a predetermined component of the frame 21. For example, the processing quantity detection sensor 350 is mounted on the left and right inner sides of the right side plate portion 139. The processing quantity detection sensor 350 is fixed to the mounting plate 355 using fasteners such as bolts 356 that pass through the protruding fixing pieces 351b located at the front and rear positions of the sensor body 351. The mounting plate 355 is fixed to the component to which it is mounted using fasteners such as bolts 357 that pass through the front and rear sides of the sensor body 351.

[0286] use Figure 23 The control structure of combine harvester 1 is described below. Figure 23 As shown, the combine harvester 1 includes a control unit 50. The control unit 50 controls various parts of the combine harvester 1 based on input signals from various sensors and other sources. The control unit 50 has the following structure: it connects, via a bus or the like, storage devices constituting a storage unit such as a CPU (Central Processing Unit) that performs various calculations and controls, RAM (Random Access Memory), ROM (Read Only Memory), etc.; input / output devices (input / output circuits) constituting an input / output unit such as an input / output interface for data input / output; peripheral circuits such as a clock circuit. The CPU of the control unit 50 performs calculations based on various programs stored in the ROM, etc.

[0287] The control unit 50 may be configured, for example, to include multiple microcomputer units connected to each other via a controller area network (CAN). However, the structure of the control unit 50 is not particularly limited. The control unit 50 is located in a designated location within the combine harvester 1.

[0288] like Figure 23 As shown, the coarse screen angle detection sensor 341 is connected to the input device (input circuit) of the control unit 50 via a cable including a signal line, and the detection signal of the coarse screen angle detection sensor 341 is transmitted to the control unit 50. The detection signal of the coarse screen angle detection sensor 341 is a signal about the amount of rotation (rotation angle) of the detection arm 342.

[0289] Furthermore, the processing quantity detection sensor 350 (sensor body 351) is connected to the input device of the control unit 50 via a cable including signal lines, and the detection signal of the processing quantity detection sensor 350 is transmitted to the control unit 50. The detection signal of the processing quantity detection sensor 350 is a signal relating to the amount of rotation (rotation angle) of the detection plate 352. The control unit 50 receives the signal input from the aforementioned sensor and generates a control signal based on the signal.

[0290] The control unit 50 adjusts the coarse screen angle based on the detection value of the processing material quantity detection sensor 350. If the amount of threshed material on the coarse screen 120 detected by the processing material quantity detection sensor 350 increases, the control unit 50 adjusts the coarse screen angle by increasing the gap between adjacent coarse screen blades 121, that is, by increasing the coarse screen angle. Specifically, this is done so that the gear arm 302 is stretched in the direction that pulls the inner wire 172 (…). Figure 18 The motor 301 performs its action by rotating in the direction of left turn (the middle direction is left turn).

[0291] On the other hand, if the amount of threshed material detected by the material quantity detection sensor 350 decreases on the coarse screen 120, the control unit 50 adjusts the coarse screen angle by reducing the gap between adjacent coarse screen blades 121, i.e., reducing the coarse screen angle. That is, the gear arm 302 is pushed in the direction that pushes the inner wire 172 ( Figure 18 The motor 301 performs its action by rotating in the direction of right turn (the middle direction is the right turn).

[0292] In the adjustment of the coarse sieve angle based on the detection value of the material quantity detection sensor 350, the grain sieve angle is adjusted together with the coarse sieve angle by utilizing the linkage structure of the coarse sieve 120 and the grain sieve 130 based on the linkage mechanism 230.

[0293] For example, when the amount of material processed on the coarse screen 120 is large, as described above, the coarse screen angle is increased by controlling the motor 301, and at the same time, the grain screen angle is increased (making the slope steeper). As a result, the amount of material passing downward through both the coarse screen 120 and the grain screen 130 increases. On the other hand, when the amount of material processed on the coarse screen 120 is small, as described above, the coarse screen angle is decreased by controlling the motor 301, and at the same time, the grain screen angle is decreased (making the slope gentler). As a result, the amount of material passing downward through both the coarse screen 120 and the grain screen 130 decreases.

[0294] According to the combine harvester 1 of this embodiment with the above structure, the screening accuracy of the screening unit 8 for the threshed material can be improved.

[0295] Regarding the oscillating screening device 43, the grain sieve 130 is configured to rotate up and down around the support shaft 138, and is configured to rotate in conjunction with the rotation of the coarse sieve blades 121. Furthermore, it is configured such that, by utilizing the linkage structure between the coarse sieve 120 and the grain sieve 130, both the coarse sieve angle and the grain sieve angle are adjusted simultaneously during the control of the coarse sieve angle by the processing quantity detection sensor 350.

[0296] Based on this structure, the tilt angle (grain sieve angle) of the grain sieve 130 can be changed together with the coarse sieve angle according to the amount of material being processed. Therefore, the grain sieve angle can be adjusted according to the amount of material being processed, the crop conditions of the harvested object, the variety, etc., thereby improving the screening accuracy of the material being processed.

[0297] When the flow rate of the processed material is high, the angle of the grain sieve is increased (making the inclination steeper) by the control unit 50 in conjunction with the coarse sieve angle. This increases the step difference between the lower grain disc 112 and the grain sieve 130, and also increases the airflow from the winnowing machine 47 that is drawn onto the grain sieve 130 from the front side. As a result, the falling distance of the processed material from the lower grain disc 112 onto the grain sieve 130 is increased, thus prolonging the contact time with the screening air and improving the screening effect.

[0298] Furthermore, by increasing the inclination angle of the grain sieve 130, the movement of the processed material that overcomes the inclination on the grain sieve 130 is suppressed, thus promoting the downward leakage of the processed material from the grain sieve 130. Consequently, the main stream of grains leaking downward from the grain sieve 130 is directly supplied to the first-grade product conveyor 45, which suppresses grain accumulation and increases the recovery rate of first-grade products based on the first-grade product conveyor 45. Moreover, even with a large quantity of processed material, the downward leakage rate of first-grade products from the grain sieve 130 is ensured, preventing a decrease in screening accuracy.

[0299] On the other hand, when the flow rate of the processed material is low, the control unit 50 reduces the angle of the grain sieve and the coarse sieve together (making the inclination gentler), which promotes the movement of the processed material on the grain sieve 130 and thus suppresses the leakage of the processed material downward from the grain sieve 130. As a result, by keeping the accumulated material on the grain sieve 130 at a constant level, excess space on the grain sieve 130 can be reduced, thereby reducing the falling of impurities such as chopped stalks from the grain sieve 130. Consequently, the screening accuracy of the processed material can be improved.

[0300] Thus, the combine harvester 1 equipped with the oscillating screening device 43 according to this embodiment has a compact structure that can adjust the inclination of the grain sieve 130 together with the coarse sieve angle by means of a control structure that adjusts the inclination of the grain sieve 130 based on the detection signal of the processing quantity detection sensor 350, thereby improving the screening accuracy and enabling the screening of multiple varieties.

[0301] Furthermore, regarding the screening section 8, an angle adjustment device 300, including a motor 301, is provided on the left side plate 139L of the side plate sections 139 located on both sides of the oscillating screening device 43. With this structure, the angle adjustment device 300 can be positioned close to the linkage mechanism 230 using existing structures, thus shortening the wire 171. Therefore, a structure incorporating the linkage mechanism 230 and the angle adjustment device 300 that performs its operation can be achieved in a compact and inexpensive manner, and good operability based on the wire 171 can be obtained.

[0302] Furthermore, for example, regarding the structure where the linkage mechanism 230 is located on the right side plate 141, the angle adjustment device 300 can be located on the right side plate portion 139. That is, the angle adjustment device 300 can be located on either the left or right side plate portion 139 depending on the configuration of the linkage mechanism 230, etc.

[0303] (Variation example)

[0304] use Figure 24 A variation of the screening unit 8 according to this embodiment will be described. For example... Figure 24 As shown, in this modified example, the operating arm 181, which serves as the operating component for rotating the grain sieve 130, is configured as a separate component from the coarse sieve operating arm 151 used for adjusting the coarse sieve angle. That is, the operating arm 181, which is the operating component for adjusting the grain sieve angle, is configured not to be directly linked to the coarse sieve operating arm 151. Furthermore, both the coarse sieve operating arm 151 and the operating arm 181 are operated by the angle adjustment device 300 via wires.

[0305] like Figure 24As shown, in this modified example, the grain sieve 130, which is configured to rotate vertically by using the support shaft 138 to rotate with the rear end as the center of rotation, is provided with a front support 180 for rotating the grain sieve 130. The operating support 180 is located on the outer side of the left side plate 141L. The operating support 180 has an operating arm 181 located on the outer side 141b of the side plate 141L. The operating arm 181 is located below the coarse sieve operating arm 151.

[0306] The operating arm 181 has a lower arm portion 181a and an upper arm portion 181b, which are formed in a bent shape with an obtuse angle, where the front side is the protruding side when viewed from the side. The operating arm 181 is composed of a plate-shaped member with the thickness direction in the left-right direction and having a bent shape based on the elongated portion of each arm portion constituting the lower arm portion 181a and the upper arm portion 181b.

[0307] The operating arm 181 is configured to rotate integrally with the left-right direction as the rotation axis by means of an arm shaft support 183 provided on the bent portion (top) of the lower arm portion 181a and the upper arm portion 181b. That is, the operating arm 181 is configured as an integral rotating body by means of the lower arm portion 181a and the upper arm portion 181b, such that the angle formed by the above-mentioned arm portions is constant and it rotates around the arm shaft support 183. The arm shaft support 183 is configured to support the operating arm 181 on the side plate 141L in a manner that allows it to rotate around a predetermined rotation axis P1.

[0308] The lower arm 181a extends downward (rearward) from the arm shaft support 183, and the upper arm 181b extends upward from the arm shaft support 183. Furthermore, the lower arm 181a has approximately 1.5 times the arm length of the upper arm 181b. Additionally, the operating support 180 is configured not to interfere with the coarse screening operating arm 151 within its rotational range.

[0309] The arm shaft support 183 is located near the horizontal lower edge 141c of the side plate 141L, and the operating arm 181 extends the lower arm 181a further downward than the lower edge 141c of the side plate 141L. The end of the lower arm 181a on the opposite side (end side) of the arm shaft support 183 is connected to the front end of the grain sieve 130 by means of a grain sieve support shaft 184 with the left-right direction as the axial direction.

[0310] The grain sieve 130 extends downward beyond the lower edge 141c of the side plate 141L, and its front portion is connected to a grain sieve support shaft 184 that passes through the end portion of the lower arm 181a at the exposed front end portion extending downward from the side plate 141L. The grain sieve 130 is supported by the grain sieve support shaft 184 and is able to rotate relative to the lower arm 181a with the left-right direction as the axis of rotation.

[0311] The grain sieve support shaft 184 includes: a shaft body portion 184a, which is a connecting portion relative to the grain sieve 130; and a flange portion 184b, which is disposed on the left and right outer sides (left side) of the shaft body portion 184a and is an enlarged diameter portion relative to the shaft body portion 184a. The grain sieve support shaft 184 has the shaft body portion 184a as a through portion relative to the lower arm portion 181a, and the flange portion 184b is located on the left and right outer sides of the lower arm portion 181a.

[0312] Based on the structure above, such as Figure 24 As shown, the operating arm 181 rotates around the arm shaft support 183 (around the rotation axis P1) (refer to arrows E1 and E2), thereby causing the grain sieve 130 to rotate around the support shaft 138 via the grain sieve support shaft 184 (refer to arrows F1 and F2), thus changing the angle of the grain sieve. Figure 24 In the image, the grain sieve 130 and the operating arm 181 in the upward operation state are shown by double-dotted lines.

[0313] Regarding the rotation of the interlocking operating arm 181 and grain sieve 130, the grain sieve support shaft 184 moves relative to the lower arm portion 181a in a manner that changes the distance between it and the arm shaft support portion 183. To allow for this change in the through position of the grain sieve support shaft 184 relative to the lower arm portion 181a, an elongated hole 181c is formed in the lower arm portion 181a along its length direction as a hole through which the grain sieve support shaft 184 passes.

[0314] The angle of the grain sieve is adjusted by rotating the operating arm 181 around the arm shaft support 183. The rotation of the operating arm 181 is achieved by the operation of an angle adjustment device 300 connected to the operating arm 181 via a second wire 271, which serves as the operating wire. Similar to wire 171, the second wire 271 has: an inner wire 272, which is the main body of the wire; and an outer tube 273, which is a covering component that substantially covers the inner wire 272.

[0315] The outer tube 273 is fixed at designated locations in multiple places. Figure 24 In the example shown, the portion near one end of the outer tube 273 is supported by a wire support 274 provided on the outer surface 141b of the side plate 141L. The inner wire 272 is configured to be movable relative to the outer tube 273, which is fixed in a fixed state.

[0316] One end of the inner wire 272 is connected to the end of the upper arm portion 181b of the operating arm 181. The wire end 275, located at one end of the inner wire 272, is supported on the end of the upper arm portion 181b by means of a locking shaft 276, allowing it to rotate around the locking shaft 276. Furthermore, the locking shaft 276 is located on either side of the upper arm portion 181b and the wire end 275, supporting the other side so that it can rotate.

[0317] The second wire 271 extends from the connection portion relative to the operating arm 181 and is configured along a predetermined path, such that its other end and the other end of the inner wire 172 of the wire 171 are connected to the angle adjustment device 300. The other end of the inner wire 272 is connected to the arm portion 302c of the gear arm 302.

[0318] The connection method of the inner wire 272 relative to the arm 302c is not limited, however, Figure 24 In the example shown, the other end of the inner wire 272 is connected (merged) with the inner wire 172 and connected to the arm 302c via a common wire end 177. Thus, wire 171 and the second wire 271 are connected to the gear arm 302 with their other ends serving as merging portions, and are configured as branch wires that branch off at one end and connect to the coarse screening operating arm 151 or the operating arm 181. Furthermore, the connection method of the inner wire 272 relative to the arm 302c can be, for example, a structure in which the other end of the inner wire 272 is connected to the arm 302c via a separate wire end relative to the inner wire 172 (shaft support).

[0319] Regarding the above structure, the inner wires 172 and 272 are pushed and pulled by the motor 301 and the small-diameter gear 304 and gear arm 302. The coarse screening operating arm 151 rotates, causing the coarse screening angle to change, and the operating arm 181 rotates, causing the grain screening angle to change. Regarding the rotation of the grain screening 130, in Figure 24 When viewed from the left, the operating arm 181 rotates to the left (refer to arrow E1), causing the grain sieve 130 to rotate in a direction that raises the front end about the support shaft 138 (refer to arrow F1). Conversely, the operating arm 181 rotates to the right (refer to arrow E2), causing the grain sieve 130 to rotate in a direction that lowers the front end about the support shaft 138 (refer to arrow F2).

[0320] Based on the modified structure described above, a structure can be achieved that allows the grain sieve 130 and the coarse sieve 120 to rotate up and down in conjunction with changes in their coarse sieve angles. This allows the grain sieve angle to be adjusted according to the amount of material being processed, the crop conditions being harvested, the variety, etc., thereby improving the screening accuracy of the processed material.

[0321] [Third Implementation Method]

[0322] use Figure 15 , Figure 22 as well as Figures 25 to 28 The third embodiment of the present invention will be described. Furthermore, in the embodiments of the present invention described below, the same names or reference numerals are used for structures common to or corresponding to the second embodiment, and repeated descriptions are appropriately omitted.

[0323] like Figure 15 and Figure 27 As shown, the combine harvester 1 according to this embodiment has a second processing material quantity detection sensor 360 in the screening section 8, which is provided on the upwind side (front side) of the screening air relative to the grain sieve 130 and detects the amount of threshed material. As the front side of the grain sieve 130, the second processing material quantity detection sensor 360 is disposed above the front part of the rear grain disc portion 112b of the lower grain disc 112.

[0324] As the second processing quantity detection sensor 360, a sensor with the same structure as the processing quantity detection sensor 350 is used; therefore, the same reference numerals are used and the description is omitted (see reference). Figure 22 The second processing material quantity detection sensor 360 uses the sensor body 351 to detect the rotational position (rotation amount) of the detection plate 352, and detects the amount of threshed material on the rear grain tray 112b based on its detection value. Furthermore, the second processing material quantity detection sensor 360 may have a different structure than the processing material quantity detection sensor 350.

[0325] Regarding the second processed material quantity detection sensor 360, the detection plate 352 is configured such that, with respect to rotation about the rotation axis 351a, the end of the other end (lower end) is positioned above the upper surface of the rear grain tray 112b at a predetermined distance when the rotating body 354 is in its initial position. Here, the predetermined distance is set to a distance that prevents the detection plate 352 and the reset plate 353 from interfering (contacting) with the rear grain tray 112b during the oscillating screening operation of the oscillating screening device 43.

[0326] According to the second processing material quantity detection sensor 360, the threshed material flowing from the front on the rear grain tray 112b exerts a pressing effect on the detection plate 352, thereby causing the rotating body 354 to rotate rearward from its initial position according to the amount of threshed material (fluid pressure). If the pressing effect of the threshed material on the rotating body 354 is released, the detection plate 352 returns to its initial position.

[0327] The second processing quantity detection sensor 360 is mounted, for example, on the inner left and right sides of the right side plate 141 of the left and right side plates 141 by means of a mounting plate 355. However, the second processing quantity detection sensor 360 may be provided on the body side (the side that does not swing) such as the component constituting the frame 21 or the side plate portion 139.

[0328] like Figure 27 As shown, the second processing quantity detection sensor 360 (sensor body 351) is connected to the input device of the control unit 50 via a cable including signal lines, and the detection signal of the second processing quantity detection sensor 360 is transmitted to the control unit 50. The control unit 50 receives the signal input from the second processing quantity detection sensor 360 and generates a control signal based on the signal.

[0329] Thus, regarding the structure equipped with the second processing quantity detection sensor 360, the control unit 50 corrects the grain sieve angle in the control of the coarse sieve angle and the grain sieve angle using the processing quantity detection sensor 350 based on the detection value of the second processing quantity detection sensor 360.

[0330] In this embodiment, the linkage mechanism 430 of the coarse sieve 120 and the grain sieve 130 has the following functions: it enables the coarse sieve 120 and the grain sieve 130 to move together so that both the coarse sieve angle and the grain sieve angle change simultaneously; and it enables the grain sieve 130 to rotate independently relative to the coarse sieve 120 so that only the grain sieve angle changes.

[0331] like Figure 26 As shown, the linkage mechanism 430 includes: a coarse screening operating arm 151; and a connecting rod 431 that connects the first arm support shaft 153 and the grain sieve 130 to each other. The connecting rod 431 is located on the outside (left side) of the left side plate 141L.

[0332] The connecting rod 431 has a first connecting arm 433 and a second connecting arm 434, which are formed in a bent shape with the front side convex when viewed from the side. The first connecting arm 433 and the second connecting arm 434 are both made of a long strip-shaped plate member with the thickness direction in the left-right direction, and are provided on the left and right outer sides (left side) relative to the front arm portion 151a and the rear arm portion 151b of the coarse screening operating arm 151.

[0333] The first connecting arm 433 supports one (upper) end along its length direction on the first arm support shaft 153 in a rotatable manner. That is, the first connecting arm 433 is configured to be able to rotate relative to the coarse screening operating arm 151 about the first arm support shaft 153.

[0334] The first connecting arm 433 is configured to rotate relative to the coarse screening operating arm 151 about the first arm support shaft 153. Figure 26The first connecting arm 433, when viewed from the left, is positioned in a near-right-angled, bent shape together with the arm 151b. A stop (not shown) restricts its relative rotation with respect to the coarse screening operating arm 151 in the direction that brings the lower end closer to the rear arm 151b (leftward rotation direction in left view). That is, the first connecting arm 433's relative rotation about the first arm support axis 153 with respect to the coarse screening operating arm 151 is limited to... Figure 17 The state shown indicates a rotation in the rightward direction.

[0335] The first connecting arm 433 is held in a position with rotational limitation relative to the coarse screening operating arm 151 about the first arm support shaft 153 by a return spring 435. The return spring 435 is mounted between the first connecting arm 433 and the rear arm portion 151b. The return spring 435 is a helical spring with hooks at both ends, such that the hook at one end engages with the support pin 436 located at the middle of the length direction of the first connecting arm 433, and the hook at the other end engages with the support pin 437 located at the middle of the length direction of the rear arm portion 151b.

[0336] The return spring 435 is a tension spring. Regarding rotation about the first arm support shaft 153, a force is applied to the first connecting arm 433 and the coarse screening operating arm 151 in a direction that brings the lower ends of the first connecting arm 433 and the rear arm portion 151b closer together. Therefore, with the return spring 435 restricting the relative rotation of the first connecting arm 433 and the coarse screening operating arm 151, the arms rotate integrally about the first arm support shaft 153 while maintaining their relative positions.

[0337] On the other hand, regarding the rotation about the first arm support axis 153, the first connecting arm 433 receives a force of more than a constant value in the direction of overcoming the force of the return spring 435, i.e., in the right-turn direction when viewed from the left, and thus rotates relative to the coarse screening operating arm 151 in the right-turn direction as the return spring 435 is stretched. That is, in the opposite direction (the right-turn direction when viewed from the left) to the direction that restricts the relative rotation with respect to the coarse screening operating arm 151, the first connecting arm 433 is allowed to rotate against the force of the return spring 435.

[0338] The second connecting arm 434 connects its end on one side (upper side) in the length direction to the lower end of the first connecting arm 433 in a manner that allows it to rotate axially in the left-right direction using the arm shaft support 438.

[0339] The second connecting arm 434 connects its other (lower) end in the longitudinal direction to the front end of the grain sieve 130 via the grain sieve support shaft 439. The grain sieve support shaft 439 has the same structure as the grain sieve support shaft 204 according to the second embodiment, and supports the grain sieve 130 in a manner that allows it to rotate in the left-right direction as the rotation axis.

[0340] Based on the structure above, such as Figure 25 As shown, the coarse screening operating arm 151 rotates around the first arm support shaft 153 (refer to arrows L1 and L2). Thus, as the coarse screening angle changes, the grain screen 130 rotates around the support shaft 138 by means of the connecting rod 431 (refer to arrows M1 and M2), thereby changing the grain screen angle.

[0341] Furthermore, the first connecting arm 433 rotates about the first arm support shaft 153, thereby causing the connecting rod 431 to rotate about the first arm support shaft 153 as its bending shape changes. As a result, the grain sieve 130 rotates about the support shaft 138, causing the grain sieve angle to change.

[0342] Regarding the rotation of the connecting rod 431 around the first arm support shaft 153, when the coarse screening operating arm 151 is in its rotating position, only the connecting rod 431 rotates, maintaining the coarse screening angle, and only the grain screening angle changes. On the other hand, when the coarse screening operating arm 151 and the connecting rod 431 rotate together, both the coarse screening angle and the grain screening angle change. Thus, the linkage mechanism 430 has a dual structure based on the coarse screening operating arm 151 and the connecting rod 431, enabling both operations that link the coarse screening 120 and the grain screening 130, and independent rotation operations only for the grain screening 130.

[0343] Thus, the coarse screening operating arm 151 and the connecting rod 431 constitute a linkage mechanism 430 that changes the grain screening angle according to the coarse screening angle. As described above, the oscillating screening device 43 is configured such that the grain screening angle of the grain screening 130 is automatically adjusted (operated) by the linkage mechanism 430 as the coarse screening angle of the coarse screening 120 is adjusted (operated).

[0344] The rotation of the connecting rod 431 is performed by the operation of the calibration angle adjustment device 300A, which is connected to the connecting rod 431 via the calibration wire 371, which serves as the operating wire. The calibration angle adjustment device 300A utilizes a device with the same structure as the angle adjustment device 300 according to the second embodiment; therefore, the same reference numerals are used and descriptions are omitted. The gear arm 302 of the calibration angle adjustment device 300A serves as an operating component for rotating the grain sieve 130 up and down around the support shaft 138 via the calibration wire 371 and the connecting rod 431.

[0345] Similar to cable 171, calibration cable 371 includes: an inner cable 372, which is the main body of the cable; and an outer tube 373, which is a covering component that substantially covers the inner cable 372. The outer tube 373 is fixed at specified locations in multiple places. Figure 16 In the example shown, the portion near one end of the outer tube 373 is supported by a wire support 374 provided on the outer surface 141b of the side plate 141L.

[0346] One end of the inner wire 372 is connected to the arm shaft support 438 that connects the first connecting arm 433 and the second connecting arm 434 to each other. The wire end 375 provided at one end of the inner wire 372 is supported on the arm shaft support 438 in a manner that allows it to rotate relative to the first connecting arm 433 and the second connecting arm 434 in the left-right direction as an axial direction.

[0347] The inner wire 372 extends from the connection portion relative to the connecting rod 431 and is arranged along a predetermined path, such that its other end is connected to the gear arm 302 of the adjustment device 300A for correction. The inner wire 372 allows the wire end 377 located at its other end to be rotatably connected to the wire support shaft portion 307 provided in the arm portion 302c of the gear arm 302.

[0348] Regarding the above structure, driven by the motor 301A, which serves as the actuator of the angle adjustment device 300A for calibration, the inner wire 372 is pushed and pulled by the small-diameter gear 304 and gear arm 302, thereby causing the connecting rod 431 to rotate and thus changing the angle of the grain sieve. The motor 301A of the angle adjustment device 300A for calibration is electrically connected to the control unit 50 (see reference). Figure 18 It receives motion control from the control unit 50.

[0349] like Figure 26 As shown, the arm shaft support 438 of the connecting rod 431 is pulled by the calibration wire 371 (refer to arrow S1), thereby causing the first connecting arm 433 to rotate to the right around the first arm support shaft 153 against the force of the return spring 435. Consequently, the grain sieve 130 is pulled upwards by the second connecting arm 434, causing it to rotate about the support shaft 138 in a direction that raises the front end (refer to arrow T1).

[0350] Conversely, the arm shaft support 438 of the connecting rod 431 is pushed by the calibration wire 371 (refer to arrow S2), thereby causing the first connecting arm 433 to rotate to the left around the first arm support shaft 153 by the force of the return spring 435. As a result, the grain sieve 130 is pressed downward by the second connecting arm 434, thereby enabling it to rotate about the support shaft 138 in a direction that lowers the front end (refer to arrow T2). Furthermore, when the arm shaft support 438 is pushed by the calibration wire 371, the coarse screening operating arm 151 rotates to the left along with the movement of the connecting rod 431 from a state that restricts the relative rotation of the first connecting arm 433 with respect to the coarse screening operating arm 151, thus changing the coarse screening angle.

[0351] Similar to the angle adjustment device 300, the calibration angle adjustment device 300A is configured to be installed on either of the left or right side plate portions 139. In this embodiment, both the angle adjustment device 300 and the calibration angle adjustment device 300A are configured to be installed on the outer side of the left side plate portion 139L, which serves as the mounting side of the linkage mechanism 430 (see reference). Figure 28 ).

[0352] exist Figure 28 In the example shown, when viewed from the left, an angle adjustment device 300 is positioned overlapping the front end of the coarse screen 120, and a correction angle adjustment device 300A is positioned below the angle adjustment device 300. Furthermore, the mounting positions of the angle adjustment device 300 and the correction angle adjustment device 300A on the side plate portion 139 are not limited. The mounting structure of the correction angle adjustment device 300A relative to the side plate portion 139 is the same as that of the angle adjustment device 300, and therefore description is omitted. An opening (not shown) is formed in the side plate portion 139L through which the linkage mechanism 430 located inside the side plate portion 139L and the wires 171 and 371 connecting the angle adjustment device 300 and the correction angle adjustment device 300A located outside the side plate portion 139L respectively pass.

[0353] As described above, the combine harvester 1 has a side plate 139L located on the left side of the screening section 8, which allows the tilt angle (coarse screening angle) and grain screening angle of the multiple coarse screening blades 121 to be changed. Each motor 301 and 301A is mounted on the side plate 139L by means of a bracket 303.

[0354] Regarding the calibration angle adjustment device 300A, the sensor corresponding to the coarse sieve angle detection sensor 341 of the angle adjustment device 300 can function as a grain sieve angle detection sensor 341A for detecting the grain sieve angle. The grain sieve angle detection sensor 341A detects the grain sieve angle using a detection arm 342, a gear arm 302, a calibration wire 371, and a connecting rod 431. For example... Figure 27 As shown, the grain sieve angle detection sensor 341A is connected to the input device (input circuit) of the control unit 50 via a cable including a signal line, and the detection signal of the grain sieve angle detection sensor 341A is transmitted to the control unit 50. The detection signal of the grain sieve angle detection sensor 341A is a signal relating to the amount of rotation (rotation angle) of the detection arm 342 of the calibration angle adjustment device 300A.

[0355] Regarding the above structure, the control unit 50 sets the control of adjusting both the coarse sieve angle and the grain sieve angle using the detection signal from the processing quantity detection sensor 350 in the manner described above as the main control. Furthermore, the control unit 50 performs correction control of the grain sieve angle using the detection signal from the second processing quantity detection sensor 360 in the main control.

[0356] As a correction control, for example in the main control, if the amount of processed material on the rear grain tray 112b detected by the second processed material quantity detection sensor 360 is low, the control unit 50 performs an operation by controlling the motor 301A to pull the correction wire 371, thereby causing the grain sieve 130 to rise and rotate. This corrects the angle of the grain sieve 130 in a direction that reduces the downward leakage of processed material from the grain sieve 130.

[0357] Furthermore, in the main control, when the amount of processed material on the rear grain tray 112b detected by the second processed material quantity detection sensor 360 is large, the motor 301A is controlled to push the correction wire 371 in the direction that causes the grain sieve 130 to descend and rotate. As a result, the angle of the grain sieve 130 is corrected in the direction that increases the downward leakage of processed material from the grain sieve 130.

[0358] According to the combine harvester 1 of this embodiment with the above structure, the control of the coarse screen angle and the grain screen angle is based on the amount of material on the coarse screen 120 detected by the material quantity detection sensor 350, and can also be mainly corrected based on the amount of material on the lower grain disc 112 located upstream of the grain screen 130 in the flow of screening air, so as to improve the screening accuracy of the material. Therefore, the coarse screen angle and the grain screen angle can be adjusted according to the amount of material, the crop conditions of the harvested crop, variety, etc.

[0359] Furthermore, regarding the screening section 8, an angle adjustment device 300 and a correction angle adjustment device 300A are provided on the left side plate 139L of the side plate sections 139 located on both sides of the oscillating screening device 43. With this structure, the angle adjustment device 300 and the correction angle adjustment device 300A can be positioned close to the linkage mechanism 430 using existing structures, allowing for the shortening of the wire 171 and the correction wire 371. Thus, a compact and inexpensive structure can be achieved, incorporating the linkage mechanism 430 and the angle adjustment device 300 and correction angle adjustment device 300A that enable its operation, and good operability based on each wire can be obtained. Moreover, the angle adjustment device 300 and the correction angle adjustment device 300A can be provided on either side of the left or right side plate sections 139 depending on the configuration of the linkage mechanism 430.

[0360] [Fourth Implementation Method]

[0361] use Figure 15 , Figure 29 and Figure 30 The fourth embodiment of the present invention will be described. The combine harvester 1 according to this embodiment is configured to adjust the signals of each sensor based on the coarse screen angle and the grain screen angle through independent control.

[0362] like Figure 15 and Figure 30 As shown, similar to the third embodiment, the combine harvester 1 according to this embodiment includes a throughput detection sensor 350 and a second throughput detection sensor 360. Additionally, as... Figure 29 As shown, the combine harvester 1 according to this embodiment includes: a coarse sieve angle adjustment device 300B, which is an angle adjustment device for adjusting the angle of the coarse sieve; and a grain sieve angle adjustment device 300C, which is used to adjust the angle of the grain sieve. Both the coarse sieve angle adjustment device 300B and the grain sieve angle adjustment device 300C utilize devices having the same structure as the angle adjustment device 300 according to the second embodiment; therefore, the same reference numerals are used and descriptions are omitted.

[0363] Furthermore, the control unit 50 performs the following controls: adjusting the coarse sieve angle based on the detection value of the processing quantity detection sensor 350 (first control); and adjusting the grain sieve angle based on the detection value of the second processing quantity detection sensor 360 (second control).

[0364] like Figure 29 As shown, in this embodiment, the structure is different from that of the variant of the second embodiment (refer to...). Figure 24Similar to the second embodiment, the coarse screening operating arm 151 for adjusting the coarse screening angle and the operating arm 181 for rotating the grain sieve 130 are configured as components that perform actions independently of each other. Similar to the modified example of the second embodiment, the coarse screening operating arm 151 is linked to the coarse screening angle adjustment device 300B via wire 171.

[0365] The operating arm 181 is linked to the grain sieve angle adjustment device 300C via the second wire 271. The inner wire 272 of the second wire 271 allows the wire end 277 located at its other end to be rotatably connected to the wire support shaft 307 of the arm portion 302c of the gear arm 302 of the grain sieve angle adjustment device 300C.

[0366] The coarse sieve angle adjustment device 300B has a first motor 301B that serves as a first actuator for changing the angle of the coarse sieve. The grain sieve angle adjustment device 300C has a second motor 301C that serves as a second actuator for changing the angle of the grain sieve.

[0367] Similar to the angle adjustment device 300 described in the second embodiment, the coarse screening angle adjustment device 300B and the grain screening angle adjustment device 300C are configured to be installed on the outer side of the left and right outer sides (left side) of the side plate portion 139, which serves as the arrangement side of the coarse screening operating arm 151 and operating arm 181. Furthermore, the installation position of the coarse screening angle adjustment device 300B and the grain screening angle adjustment device 300C on the side plate portion 139 is not limited.

[0368] Furthermore, the angle adjustment device 300B for the coarse screen and the angle adjustment device 300C for the grain screen can be arranged in different orientations relative to the side plate portion 139 depending on the arrangement of the wire 171 or the second wire 271. Figure 29 In the example shown, the coarse sieve angle adjustment device 300B is arranged with the opposite orientation to the grain sieve angle adjustment device 300C.

[0369] As described above, the combine harvester 1 includes in the screening section 8: a first motor 301B, which is provided on the left side plate 139L and changes the angle of the coarse screen; and a second motor 301C, which is also provided on the side plate 139L and changes the angle of the grain screen.

[0370] Regarding the angle adjustment device 300C for grain sieves, the sensor corresponding to the coarse sieve angle detection sensor 341 of the angle adjustment device 300 becomes the grain sieve angle detection sensor 341C for detecting the grain sieve angle. The grain sieve angle detection sensor 341C detects the grain sieve angle using a detection arm 342, a gear arm 302, a second wire 271, and an operating arm 181. For example... Figure 21As shown, the grain sieve angle detection sensor 341C is connected to the input device (input circuit) of the control unit 50 via a cable including a signal line, and the detection signal of the grain sieve angle detection sensor 341C is transmitted to the control unit 50. The detection signal of the grain sieve angle detection sensor 341C is a signal about the amount of rotation (rotation angle) of the detection arm 342 of the grain sieve angle adjustment device 300C.

[0371] Regarding the above structure, as the first control for controlling the coarse screening angle, the control unit 50 performs the following control: When the quantity of material detected by the quantity sensor 350 is high on the coarse screen 120, in order to increase the downward leakage of material from the coarse screen 120, the first motor 301B is operated in the direction of stretching the inner wire 172, thereby rotating the coarse screening operating arm 151 and increasing the coarse screening angle. On the other hand, when the quantity of material detected by the quantity sensor 350 is low on the coarse screen 120, in order to reduce the downward leakage of material from the coarse screen 120, the first motor 301B is operated in the direction of pushing the inner wire 172, thereby rotating the coarse screening operating arm 151 and decreasing the coarse screening angle.

[0372] Furthermore, as a second control for controlling the angle of the grain sieve, the control unit 50 performs the following control: When there is a large amount of material on the rear grain disc 112b detected by the second material quantity detection sensor 360, in order to increase the downward leakage of material from the grain sieve 130, the second motor 301C is operated in the direction of pushing the inner wire 272, thereby causing the operating arm 181 to descend and rotate, thus increasing the angle of the grain sieve. On the other hand, when there is a small amount of material on the rear grain disc 112b detected by the second material quantity detection sensor 360, in order to reduce the downward leakage of material from the grain sieve 130, the second motor 301C is operated in the direction of pulling the inner wire 272, thereby causing the operating arm 181 to rise and rotate, thus decreasing the angle of the grain sieve.

[0373] The first control regarding the coarse sieve angle and the second control regarding the grain sieve angle are performed as above, based on the amount of processed material detected by each of the processed material quantity detection sensors 350 and 360, which are independent of each other.

[0374] According to the combine harvester 1 of this embodiment, which has the above structure, the angles of the coarse screen and the grain screen can be adjusted independently based on the accumulation of processed material around the coarse screen 120 and the grain screen 130, respectively. The amount of processed material with a high proportion of dust or other impurities is detected by the processed material quantity detection sensor 350, and the coarse screen angle is adjusted based on this quantity. The amount of processed material leaking downwards from the coarse screen 120 with a low proportion of impurities is detected by the second processed material quantity detection sensor 360, and the grain screen angle is adjusted based on this quantity. Thus, despite its compact structure, extremely precise control is possible, effectively improving screening accuracy, effectively removing straw and other debris, and enabling the screening of multiple varieties.

[0375] Furthermore, regarding the screening section 8, a coarse screening angle adjustment device 300B and a grain screening angle adjustment device 300C are provided on the left side plate portion 139L of the side plate portions 139 located on both sides of the oscillating screening device 43. With this structure, the coarse screening angle adjustment device 300B and the grain screening angle adjustment device 300C can be positioned close to the coarse screening operating arm 151 and the operating arm 181, respectively, using existing structures, thus shortening the wire 171 and the second wire 271. Therefore, a compact and inexpensive structure can be achieved, incorporating two arms and the coarse screening angle adjustment device 300B and the grain screening angle adjustment device 300C that actuate them, and good operability based on each wire can be obtained. Moreover, the coarse screening angle adjustment device 300B and the grain screening angle adjustment device 300C can be provided on either side of the left or right side plate portion 139 depending on the configuration of the coarse screening operating arm 151 and the operating arm 181.

[0376] (Structure of the winnowing machine's speed belt system)

[0377] Regarding the combine harvester 1, a winnowing machine speed change device (airflow regulating device) is provided for adjusting the airflow of the winnowing machine 47 by changing its rotational speed. The winnowing machine speed change device has a split pulley mounted on a rotating shaft that supports the winnowing machine 47. The split pulley, along with other pulleys, receives the belt winding and rotates using friction with the belt. The winnowing machine speed change device is configured as a belt-type continuously variable transmission mechanism that allows the speed ratio to be variable by causing the split pulley to actuate and change the belt winding radius.

[0378] The winnowing machine speed change device includes: a dividing pulley, which is disposed on the rotating shaft of the winnowing machine 47 and receives the belt winding; a cam mechanism that changes the width (groove width) of the dividing pulley; an actuator such as a motor that operates the cam mechanism; and a transmission mechanism that transmits the power of the actuator to the cam mechanism. The dividing pulley includes: a fixed pulley, which is fixedly disposed on the rotating shaft of the winnowing machine 47; and a movable pulley, which is configured to be unable to rotate relative to the rotating shaft of the winnowing machine 47 and is capable of axial movement, causing the movable pulley to move relative to the fixed pulley, thereby changing the groove width of the dividing pulley, i.e., the winding radius of the belt. Furthermore, regarding the structure for changing the groove width of the dividing pulley in the winnowing machine speed change device, there are forced drive types based on actuators such as motors and balanced types utilizing spring force.

[0379] Regarding the speed change mechanism of this type of winnowing machine, there exists a device with the following structure: a guide pin, which functions as a guide member for the axial movement of the movable pulley relative to the fixed pulley, is provided between the two pulleys (see, for example, Japanese Patent Application Publication No. 2011-83226). The guide pin is arranged such that its axis is parallel to the rotation axis of the winnowing machine 47, fixed to the fixed pulley and passing through the movable pulley, and multiple guide pins are arranged around the rotation axis.

[0380] The structure with multiple guide pins between the fixed and movable pulleys presents the following problems. For example, when the slot width of the dividing pulley is at its maximum, i.e., when the winding radius of the belt on the dividing pulley is at its minimum and the air volume of the winnowing machine 47 is at its maximum, the belt is located closest to the center side (rotation axis side) of the dividing pulley. With the belt in this position, for example, if the dividing pulley generates excessive torque, the belt may become trapped in the dividing pulley, causing the belt's web side (inner circumferential side) to contact the guide pins. This contact between the belt and the guide pins can accelerate belt wear. Especially with toothed belts, this contact with the guide pins can lead to damage to the teeth (protrusions). Furthermore, since the guide pins are made of different components than the pulleys, the structure using guide pins increases the number of parts and assembly time.

[0381] Therefore, the purpose of the winnowing machine belt changer device according to this embodiment is to provide a structure that can suppress wear and damage of the belt wound on the split pulley with a simple structure.

[0382] use Figures 31 to 35 The winnowing machine speed change belt device 500 according to this embodiment will be described. The winnowing machine speed change belt device 500 is configured to change the speed of the winnowing machine 47 (see reference 47). Figure 5 The winnowing machine speed control device (airflow regulating device) adjusts the airflow of the winnowing machine 47 by regulating its rotational speed. For example... Figure 31As shown, the winnowing machine belt changer 500 includes: a rotating shaft 501 that supports the winnowing machine 47; a dividing pulley 502 disposed on the rotating shaft 501 and receiving the winding of the belt 505; and a cam mechanism 503 that changes the width (groove width) of the dividing pulley 502. The winnowing machine belt changer 500 constitutes a belt-type continuously variable transmission mechanism that causes the dividing pulley 502 to actuate and changes the winding radius of the belt 505, thereby making the gear ratio variable.

[0383] The rotating shaft 501 extends in the left-right direction with the left-right direction of the machine body as its axis. The winnowing machine 47 is configured to rotate integrally with the rotating shaft 501 relative to the rotating shaft 501. The rotating shaft 501 causes the left side ( Figure 31 The right side of the threshing section 7 and the screening section 8 are located on the left and right side plates 139 (see reference). Figure 5 , Figure 16 The left side plate portion 139L protrudes from the rotating shaft 501. A dividing pulley 502 and a cam mechanism 503 are provided on the protruding portion of the left side plate portion 139L.

[0384] The dividing pulley 502, along with other pulleys (not shown), receives the winding of the belt 505. The dividing pulley 502 has: a fixed pulley 511, serving as a first pulley, which is fixedly mounted to the rotating shaft 501; and a movable pulley 512, serving as a second pulley, which is configured to be unable to rotate relative to the rotating shaft 501 and is capable of axial movement. Both the fixed pulley 511 and the movable pulley 512 have a shape resembling rotating bodies, such that their central axes coincide with the axis of rotation of the rotating shaft 501.

[0385] The fixed pulley 511 and the movable pulley 512 are arranged opposite each other on the rotating shaft 501, with the fixed pulley 511 on its right side. Figure 31 A movable pulley 512 is provided on the left side of the middle section. The movable pulley 512 moves relative to the fixed pulley 511, thereby changing the groove width of the dividing pulley 502, that is, the winding radius of the belt 505 on the dividing pulley 502.

[0386] like Figure 31 and Figure 33 As shown, the fixed pulley 511 has: a base 521, which forms the central side of the fixed pulley 511 and has an approximately disc-shaped shape; and a plate-shaped flange 522, which is provided on the outer periphery of the base 521. The fixed pulley 511 has the base 521 protruding relative to the flange 522 on the left side, and has a fixed-side clamping surface 523 on the right side that clamps the belt 505 together with the movable pulley 512.

[0387] The fixed-side clamping surface 523 has a flat frustoconical shape with the right side as the apex. The fixed-side clamping surface 523 is formed such that the right side of the fixed pulley 511, except for the inner circumferential edge, is formed as the almost entire surface of the flange portion 522 in the radial direction.

[0388] The fixed pulley 511 is fixed to the rotating shaft 501 in a state where the left end of the rotating shaft 501 passes through and is positioned axially on the rotating shaft 501. A support hole 526 is formed at the center of the base 521 of the fixed pulley 511, through which the rotating shaft 501 passes. The fixed pulley 511 is fixed to the rotating shaft 501 by means of a fastening member 527 that engages with the external thread 501a formed at the left end of the rotating shaft 501. A washer 528 is sandwiched between the fastening member 527 and the fixed pulley 511, through which the external thread 501a passes.

[0389] In addition, a key 530 is provided between the rotating shaft 501 and the fixed pulley 511 to restrict their relative rotation. The key 530 is engaged with keyways formed on the outer peripheral surface of the rotating shaft 501 and the inner peripheral surface of the support hole 526 of the fixed pulley 511.

[0390] like Figure 31 and Figure 34 As shown, the movable pulley 512 has: a circular plate-shaped pulley body portion 541, which is configured as a movable side clamping surface 543 that acts as a surface that supports the belt 505; and a support cylinder portion 542, which protrudes in a cylindrical shape from the center of the pulley body portion 541 toward the right.

[0391] The movable side clamping surface 543 has a flat frustum shape with the left side as the vertex side, and is configured to be opposite to the fixed side clamping surface 523 and have a shape that is substantially symmetrical to the fixed side clamping surface 523 in the axial direction of the rotation axis 501.

[0392] The movable pulley 512 is configured to allow the rotating shaft 501 to pass through and to move axially along the rotating shaft 501. A support hole 546 is formed at the center of the movable pulley 512, through which the rotating shaft 501 passes. Most of the support hole 546 is formed in the support cylinder portion 542. A cylindrical bushing 550, through which the rotating shaft 501 passes, is sandwiched between the rotating shaft 501, through which the support hole 546 passes, and the movable pulley 512.

[0393] The fixed pulley 511 and the movable pulley 512, which have the above structure, form a V-shaped groove 540 by the fixed side clamping surface 523 and the movable side clamping surface 543 that are opposite to each other, so that the belt 505 can be wound around.

[0394] By moving the movable pulley 512 to the left and approaching the fixed pulley 511, the groove width of the groove portion 540 decreases, thereby increasing the winding radius of the belt 505. This, in turn, slows down the rotational speed of the rotating shaft 501 (see reference). Figure 31 The movable pulley 512 moves to the right, away from the fixed pulley 511, thereby increasing the groove width of the groove 540 and decreasing the winding radius of the belt 505, thus increasing the rotational speed of the rotating shaft 501 (see reference). Figure 32 ). Figure 31 The diagram shows the trough section 540 in its most closed state, which is also the winnowing machine 47 in its lowest speed state. Figure 32 The maximum extended state of the trough 540 is shown, which is the highest speed state of the winnowing machine 47.

[0395] The cam mechanism 503 includes: a fixed speed-changing cam 551, which is fixed to the side of the main body; and a movable speed-changing cam 552, which is configured to move axially along the rotation shaft 501 integrally with the movable pulley 512. The fixed speed-changing cam 551 and the movable speed-changing cam 552 have substantially the same shape and are configured to be substantially symmetrical along the rotation shaft 501. The fixed speed-changing cam 551 and the movable speed-changing cam 552 are arranged opposite each other on the rotation shaft 501, with the fixed speed-changing cam 551 located to the right of the movable speed-changing cam 552.

[0396] The fixed-speed cam 551 has: a base 553 that is approximately annular or cylindrical; a fixed plate portion 554, which is a plate-shaped protrusion extending from the base 553 to the front and rear sides; and a plurality of cam protrusions 555. The fixed-speed cam 551 is such that a rotating shaft 501 passes through the center of the base 553, and is supported by a cylindrical sleeve 561 externally fitted to the rotating shaft 501 and a bearing 562 externally fitted to the sleeve 561, allowing it to rotate relative to the rotating shaft 501. The bearing 562 is locked by a retaining ring 563 when engaged with the inner circumference of the base 553. A cylindrical locking member 564 externally fitted to the rotating shaft 501 is provided on the right side of the sleeve 561.

[0397] The fixed transmission cam 551 is fixed to the front and rear fixed plates 554 by bolts 565. Bolts 365 pass through the fixed plates 554 and the support plate 566 and are screwed into the nut portion 567 provided on the support plate 566. The support plate 566 is fixed to the support frame 568 provided on both sides of the traveling body by welding or the like.

[0398] The cam protrusion 555 is a tab that protrudes from the base 553 toward the left and has a cylindrical peripheral wall shape. The cam protrusion 555 is the part that engages with the movable transmission cam 552 and has a cam surface 555a that is inclined relative to the rotation axis 501. The cam protrusion 555 is provided at three locations at equal angular intervals in the circumferential direction of the base 553.

[0399] The movable variable speed cam 552 has: a base 573 that is approximately annular or cylindrical; a fixed plate portion 574, which is a plate-shaped protrusion extending from the base 573 to the front and rear sides; and a plurality of cam protrusions 575. The movable variable speed cam 552 causes the end portion (right end portion) of the support cylinder portion 542 of the movable pulley 512 to pass through the center portion of the base 573, and is supported by a bearing 582 externally fitted into the end portion of the support cylinder portion 542, so that it can rotate relative to the support cylinder portion 542, and is in a state that restricts the axial movement of the rotation shaft 501. The bearing 582 is locked by a retaining ring 583 when it is engaged with the inner circumferential side of the base 573.

[0400] The movable variable speed cam 552 is configured to receive rotational power from an actuator (not shown) such as a motor and rotate around a rotation axis 501. The rotational power of the actuator is transmitted to the movable variable speed cam 552 via a transmission mechanism. Regarding the movable variable speed cam 552, the arm plate 584 constituting the transmission mechanism is fixed to the fixed plate portion 574 using bolts 585 and nuts 586. Bolts 585 pass through the fixed plate portion 574 and the arm plate 584 and are screwed into the nut 586.

[0401] One end of the connecting rod 587 constituting the transmission mechanism is rotatably connected to the arm plate 584 by a connecting pin 588. The other end of the connecting rod 587 is connected to a specified transmission component (not shown) that constitutes the transmission mechanism and is driven by an actuator to perform an action.

[0402] The cam protrusion 575 is a tab-like portion that protrudes from the base 573 toward the right and has a cylindrical peripheral wall shape. The cam protrusion 575 is the portion that engages with the cam protrusion 555 of the fixed transmission cam 551 and has a cam surface 575a that is inclined relative to the rotation axis 501. The cam protrusion 575 is provided at three locations at equal angular intervals in the circumferential direction of the base 573.

[0403] The fixed-speed cam 551 and the movable-speed cam 552, having the above structure, are engaged with each other when the cam surfaces 555a and 575a of the corresponding cam protrusions 555 and 575 are in contact with each other. Furthermore, the movable-speed cam 552 receives power from the actuator via a connecting rod 587 and the like, and rotates around the rotation axis 501. This causes the fixed-speed cam 551 and the movable-speed cam 552 to slide along the rotation axis 501 due to the action of the cam protrusions 555 and 575, making the cam surfaces 555a and 575a sliding surfaces. Here, the movable-speed cam 552 moves axially along the rotation axis 501 as an integral part of the movable pulley 512. Thus, as described above, the rotational speed of the winnowing machine 47 is changed. Furthermore, the operation of the actuator of the winnowing machine speed change device is, for example, operated by the speed change operation unit of the winnowing machine 47 provided in the operating unit 15.

[0404] Regarding the winch belt changer 500 with the above structure, a pawl engagement part 600 is provided, which functions as a guide for the axial movement of the movable pulley 512 relative to the fixed pulley 511. Furthermore, in Figure 31 and Figure 32 For convenience, the portion of the claw engagement part 600 is shown as the external part (non-sectional part).

[0405] The pawl engagement portion 600 is the engagement portion of the fixed-side pawl portion 610, which is provided as part of the fixed pulley 511, and the movable-side pawl portion 620, which is provided as part of the movable pulley 512. The fixed pulley 511 and the movable pulley 512 are positioned so that the fixed-side pawl portion 610 and the movable-side pawl portion 620 are facing each other, and their respective concave and convex shapes are interlocked and engaged with each other.

[0406] The fixing claw portion 610 is provided with a constant diameter at the center of the fixing side clamping surface 523 (right side) of the fixing pulley 511, in a concentric cylindrical shape relative to the central axis of the fixing pulley 511, and protrudes to the right from the fixing side clamping surface 523. The fixing claw portion 610 has an outer peripheral surface 610a along a cylindrical or approximately cylindrical shape. The outer peripheral surface 610a forms the bottom surface (inner peripheral surface) of the groove portion 540. The fixing claw portion 610 has a periodic shape in which multiple mountain-shaped portions 611 and valley-shaped portions 612 are alternately arranged in the circumferential direction of the fixing pulley 511.

[0407] The mountain-shaped portion 611 is formed by a first inclined portion 615 and a second inclined portion 616 constituting a straight ridge portion 613 that is radially straight when viewed in the direction of the central axis of the fixed pulley 511. When the rotation direction in one direction (refer to arrow X1) of the fixed pulley 511 is set as the positive rotation direction, the inclined portion on the upstream side of the pair of inclined portions constituting each mountain-shaped portion 611 in the positive rotation direction is designated as the first inclined portion 615, and the inclined portion on the downstream side in that direction is designated as the second inclined portion 616.

[0408] The first inclined portion 615 and the second inclined portion 616 have a common shape / size when viewed axially from the fixed pulley 511, and form an approximately isosceles triangle with the central side as the vertex (see reference). Figure 24 The ridge portion 613 is inclined in a direction that descends from the radial outer periphery of the fixed pulley 511 toward the center. That is, regarding the height of the mountain-shaped portion 611, the height is the protrusion dimension protruding from a predetermined reference surface perpendicular to the central axis direction of the fixed pulley 511, and the height is highest at the outer periphery end of the ridge portion 613. Each mountain-shaped portion 611 forms a triangular claw in the fixed side claw portion 610.

[0409] The valley-shaped portion 612 is formed by a second inclined portion 616 of one of the two adjacent mountain-shaped portions 611 in the circumferential direction of the fixed pulley 511, and a first inclined portion 615 of the mountain-shaped portion 611 on the upstream side in the forward rotation direction (refer to arrow X1), thus forming a straight valley line portion 614 when viewed in the radial direction of the central axis of the fixed pulley 511. That is, the valley-shaped portion 612 is formed by the second inclined portion 616 and the first inclined portion 615, which are recesses between the adjacent mountain-shaped portions 611 in the circumferential direction of the fixed pulley 511.

[0410] Mountain-shaped portions 611 and valley-shaped portions 612 are formed alternately at equal intervals along the circumference of the fixed pulley 511. Ridge portions 613 and valley portions 614, when viewed along the central axis of the fixed pulley 511, are formed radially with the position X0 of the central axis of the fixed pulley 511 as the center (see reference). Figure 33 ).

[0411] In this embodiment, four mountain-shaped portions 611 and valley-shaped portions 612 are formed at equal intervals (90° intervals) and with a common height (depth) in the circumferential direction of the fixed pulley 511. Thus, the fixed side claw portion 610 has four triangular claws. Furthermore, the number of triangular claws is not limited to this embodiment.

[0412] The movable side claw portion 620 is provided with a constant diameter at the center of the movable side clamping surface 543 (left side) of the movable pulley 512, in a concentric cylindrical shape relative to the central axis of the movable pulley 512, and protrudes from the movable side clamping surface 543 toward the left. The movable side claw portion 620 has an outer peripheral surface 620a that is cylindrical or approximately cylindrical. The outer peripheral surface 620a forms the bottom surface (inner peripheral surface) of the groove portion 540. The movable side claw portion 620 is formed to have the same shape / size as the fixed side claw portion 610; therefore, the same reference numerals are used and descriptions are omitted.

[0413] Regarding the winch belt changer 500 with the above structure, the fixed pulley 511 and the movable pulley 512 are configured to engage with each other by means of a mountain-shaped portion 611 and a valley-shaped portion 612, which interlock the fixed side claw portion 610 and the movable side claw portion 620, thereby restricting the relative rotation of the movable pulley 512 relative to the fixed pulley 511. In other words, the movable pulley 512 is restricted from relative rotation with respect to the rotating shaft 501 by means of the fixed pulley 511 fixedly mounted on the rotating shaft 501. Therefore, the fixed pulley 511 and the movable pulley 512 rotate integrally with the rotating shaft 501.

[0414] Furthermore, as the movable pulley 512 on the rotating shaft 501 moves, the movable side claw 620 approaches / separates from the fixed side claw 610, thereby causing the groove width of the groove 540, i.e. the winding radius of the belt 505, to change.

[0415] Figure 35 A shows Figure 31 The state of the claw engagement portion 600 in the maximum closed state of the groove portion 540 shown. Regarding... Figure 35 In the state shown in A, the entire mountain-shaped portion 611 of the fixed side claw portion 610 and the movable side claw portion 620 is engaged with another valley-shaped portion 612, thereby forming a state in which the two claw portions are in contact with each other across the entire surface. Figure 35 The state shown in A corresponds to the lowest speed state of the winnowing machine 47 that maximizes the winding radius of the 505.

[0416] Figure 35 B shows Figure 32 The shown image shows the claw engagement portion 600 in its fully extended state of the groove portion 540. The movable pulley 512... Figure 35 The state shown in A moves in the direction of separation from the fixed pulley 511, thus as... Figure 35As shown in Figure B, the fixed side claw 610 and the movable side claw 620 are engaged with each other in a state where the top portion of the mountain-shaped portion 611 is in contact with each other, creating a gap 630 between them. That is, when the movable pulley 512 moves from the maximum closed state of the dividing pulley 502 to the separation direction, the fixed side claw 610 and the movable side claw 620 are in a state where the top portion of the mountain-shaped portion 611 is in contact with each other, thereby maintaining the engaged state of the fixed pulley 511 and the movable pulley 512, that is, the integrated rotation state of the two pulleys.

[0417] The fixed pulley 511 and the movable pulley 512, which are engaged with each other, have the first inclined surface 615 or the second inclined surface 616 of the fixed side claw portion 610 and the movable side claw portion 620 as guide surfaces, and the relative circumferential position of the two pulleys changes as the movable pulley 512 moves axially. Figure 35 The state shown in B corresponds to the highest speed state of the winnowing machine 47 that minimizes the winding radius of belt 505. Furthermore, Figure 35 A and Figure 35 B is a schematic diagram showing how the pawl engagement part 600 is expanded in the circumferential direction of the pulley.

[0418] According to the winnowing machine speed change belt device 500 with the above structure, even when the belt 505 is embedded in the inner circumference and in contact with the bottom side of the groove 540 when the pulley 502 is in its maximum unfolded state, i.e., in bottom contact, the bottom side of the groove 540 is also formed by a smooth surface without protrusions, i.e., the outer circumference surface 610a, 620a. Therefore, wear and damage to the belt 505 can be suppressed.

[0419] Furthermore, by making the fixed-side claw portion 610 and the movable-side claw portion 620 as part of the fixed pulley 511 or the movable pulley 512, respectively, the number of parts and assembly time can be reduced compared to structures using guide pins. Additionally, by manufacturing the fixed pulley 511 and the movable pulley 512 as an integral piece with the fixed-side claw portion 610 or the movable-side claw portion 620 through casting, forging, investment casting, etc., the number of claw machining steps can be reduced, and the connection structure of the two pulleys can be easily realized. Furthermore, by performing heat treatment on the claw portion, the durability of the claw portion can be improved.

[0420] Furthermore, regarding the claw engagement portion 600, even if debris such as belt dust or slag generated from the belt 505 intrudes between the fixed-side claw portion 610 and the movable-side claw portion 620, the debris can be discharged to the outside through the gap 630 between them using the centrifugal force generated by the rotation of the dividing pulley 502. This prevents debris from obstructing the smooth operation of the movable pulley 512, ensuring good operability of the winch belt changer 500 during speed change.

[0421] The above-described embodiments are examples of the present invention, and the present invention is not limited to the above-described embodiments. Therefore, even embodiments other than those described above can be modified in various ways depending on the design, as long as they do not depart from the technical concept involved in the present invention. In addition, the effects described in this disclosure are merely examples and are not limited thereto; other effects may also be present.

[0422] In the above embodiment, the combine harvester 1 is a conventional combine harvester; however, the present invention can also be applied to other combine harvesters, such as self-tapping combine harvesters.

[0423] Regarding the configuration of the grain sieve 130 as a structure capable of rotating up and down, the control of the rotation of the grain sieve 130 using the control unit 50 can be performed as follows: In the event of either "engaging" or "disengaging" the threshing clutch 57 based on the operating clutch lever provided on the driving unit 15, after temporarily rotating the grain sieve 130 to maximize its angle, a reset operation is performed to rotate it to minimize its angle.

[0424] The engagement / disengagement state of the threshing clutch 57 is detected by a threshing clutch sensor connected to the control unit 50. The control unit 50 monitors the engagement / disengagement state of the threshing clutch 57, i.e., the on / off state of the threshing device, based on the detection signal from the threshing clutch sensor. Upon receiving the detection signal from the threshing clutch sensor, the control unit 50 controls the grain sieve 130 to rotate from the disengaged state to the engaged state or vice versa, and then controls it to rotate from the upper end to the lower end.

[0425] In this way, the grain sieve 130 is reset according to the engagement and disengagement operation of the threshing clutch 57, thereby suppressing the clogging of the grain sieve 130 mesh and improving the screening accuracy of the screening unit 8 for the threshed material.

[0426] This technology can take the following structure. Furthermore, the structures described below can be selected, chosen, and combined arbitrarily.

[0427] (1) A combine harvester comprising: a threshing section for threshing crops; a oscillating screening device for screening the threshed material after threshing by the threshing section; and a winnowing machine for supplying screening air to the oscillating screening device, characterized in that,

[0428] The oscillating screening device has a grain sieve for screening the threshed material.

[0429] The grain sieve is configured to rotate in such a way that the upwind side of the screening air moves up and down with the downwind side of the screening air serving as a support.

[0430] (2) The combine harvester described in (1) is characterized in that,

[0431] The oscillating screening device includes: a coarse screen disposed above the grain sieve for screening the threshed material.

[0432] The coarse screen includes multiple blades arranged in an adjustable tilt angle, and is configured to adjust the downward leakage amount of the threshed material according to the tilt angle of the multiple blades.

[0433] The grain sieve is configured to rotate in conjunction with changes in the tilt angle of the plurality of blades.

[0434] (3) The combine harvester according to (1) or (2) is characterized in that,

[0435] The oscillating screening device includes: a grain disc disposed on the front side of the grain sieve and for receiving the threshed material leaking downwards from the coarse sieve.

[0436] A sieve section with multiple sieve lines arranged in parallel is provided on the rear side of the grain disc.

[0437] (4) The combine harvester described in any one of (1) to (3) is characterized in that,

[0438] The swing screening device is located between the left and right side plates.

[0439] The left and right outer side plates of the left and right side plates are provided with an opening that includes at least a portion of the grain sieve when viewed from the side.

Claims

1. A combine harvester comprising: a threshing section for threshing crops; a oscillating screening device for screening the threshed crop by the threshing section; and a winnowing machine for supplying screening air to the oscillating screening device. Its features are, The oscillating screening device has a grain sieve for screening the threshed material. The grain sieve is configured to rotate in such a way that the upwind side of the screening air moves up and down with the downwind side of the screening air serving as a support.

2. The combine harvester according to claim 1, characterized in that, The oscillating screening device includes: a coarse screen disposed above the grain sieve for screening the threshed material. The coarse screen includes multiple blades arranged in an adjustable tilt angle, and is configured to adjust the downward leakage amount of the threshed material according to the tilt angle of the multiple blades. The grain sieve is configured to rotate in conjunction with changes in the tilt angle of the plurality of blades.

3. The combine harvester according to claim 1 or claim 2, characterized in that, The oscillating screening device includes: a grain disc disposed on the front side of the grain sieve and for receiving the threshed material leaking downwards from the coarse sieve. A sieve section with multiple sieve lines arranged in parallel is provided on the rear side of the grain disc.

4. The combine harvester according to claim 1, characterized in that, The swing screening device is located between the left and right side plates. The left and right outer side plates of the left and right side plates are provided with an opening that includes at least a portion of the grain sieve when viewed from the side.

5. The combine harvester according to claim 2, characterized in that, The combine harvester also features: A quantity detection sensor for processing material, which detects the quantity of threshed material on the coarse screen; and The control unit adjusts the tilt angle of the plurality of blades based on the detection values ​​of the processed material quantity detection sensor. The grain sieve is configured to rotate in conjunction with changes in the tilt angle of the plurality of blades.

6. The combine harvester according to claim 5, characterized in that, The combine harvester also includes a second processing quantity detection sensor, which is positioned upwind of the screening air relative to the grain sieve and detects the amount of threshed material. The control unit corrects the angle of the grain sieve during the control process based on the detection value of the second processed material quantity detection sensor.

7. The combine harvester according to claim 5 or claim 6, characterized in that, The swing screening device is located between the left and right side plates. The combine harvester also includes an actuator disposed on either of the left and right side plates and capable of changing the tilt angle of the plurality of blades.

8. A combine harvester comprising: a threshing section for threshing crops; a oscillating screening device for screening the threshed crop; and a winnowing machine for supplying screening air to the oscillating screening device. Its features are, The swing screening device has: A coarse screen, configured to vary the downward leakage of the threshed material based on the tilt angle of multiple blades; and A grain sieve, positioned below the coarse sieve, is used to screen the threshed material. The grain sieve is configured to rotate by using the downwind side of the screening air as a support, thereby allowing the upwind side of the screening air to move up and down. The combine harvester also features: A material quantity detection sensor detects the amount of threshed material on the coarse screen; The second processing material quantity detection sensor is disposed on the upwind side of the screening air relative to the grain sieve, and detects the quantity of threshed material. as well as The control unit adjusts the tilt angle of the plurality of blades based on the detection value of the processed material quantity detection sensor, and adjusts the rotation angle of the grain sieve based on the detection value of the second processed material quantity detection sensor.

9. The combine harvester according to claim 8, characterized in that, The swing screening device is located between the left and right side plates. The combine harvester also features: The first actuator is disposed on either of the left and right side plates and causes the tilt angle of the plurality of blades to change; and A second actuator is disposed on either of the left and right side plates and causes the rotation angle of the grain sieve to change.

Images