combine

Abstract

To provide a combine harvester that can improve the sorting accuracy of threshed material in the sorting section. [Solution] A combine harvester comprising a threshing unit for threshing crops, an oscillating sorting device 43 for sorting the threshed material threshed by the threshing unit, and a winnowing machine 47 for blowing sorting air to the oscillating sorting device 43, wherein the oscillating sorting device 43 has a grain sieve 130 for sorting the threshed material, and the grain sieve 130 is rotatably provided so as to move the upwind side of the sorting air up and down with the downwind side of the sorting air as a support shaft 138.

Description

Technical Field

[0001] The present invention relates to a combine harvester provided with a rocking sorting device for sorting grain that has been threshed by a threshing unit.

Background Art

[0002] Some combine harvesters are configured to convey the crops cut by a cutting unit to a threshing unit by a conveying device and supply them to the threshing unit, and to sort the grain (threshed product) threshed by the threshing unit by a sorting unit provided below the threshing unit. The sorting unit has a rocking sorting device that sorts grain by rocking. The rocking sorting device includes, as a sorting configuration, a chaff sieve having a plurality of fins and a grain sieve provided below the chaff sieve. Further, the sorting unit is provided with a configuration for generating sorting air for obtaining a winnowing effect, such as a fanning mill or a fan.

[0003] Regarding the configuration of the sorting unit, Patent Document 1 describes a configuration in which the area of the grain sieve can be changed operably and the air volume of the sorting air flowing above the grain sieve from the fanning mill can be switched operably.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a conventional sorting unit, there is a problem that sufficient sorting accuracy of the threshed product cannot be obtained in the sorting unit, for example, when the amount of the threshed product becomes relatively large.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a combine harvester capable of improving the sorting accuracy of the threshed product in the sorting unit. [Means for solving the problem]

[0007] The combine harvester according to the present invention comprises a threshing unit for threshing crops, an oscillating sorting device for sorting the threshed material obtained by the threshing unit, and a winnowing machine for blowing sorting air to the oscillating sorting device, wherein the oscillating sorting device has a grain sieve for sorting the threshed material, and the grain sieve is rotatably provided so as to move the upwind side of the sorting air up and down with the downwind side of the sorting air as the support shaft.

[0008] The combine harvester according to the present invention is configured such that the oscillating sorting device has a chaff sieve provided above the grain sieve for sorting threshed material, the chaff sieve includes a plurality of fins provided so as to be adjustable inclination angle, and the amount of threshed material leaking out is adjusted by the inclination angle of the plurality of fins, and the grain sieve is provided to rotate in conjunction with the change in inclination angle of the plurality of fins.

[0009] The combine harvester according to the present invention has a swivel sorting device which is provided in front of the grain sieve and has a grain pan that receives the threshed material that has leaked down from the chaff sieve, and a sieving section is provided behind the grain pan, which has a plurality of sieving wires arranged in parallel.

[0010] In the combine harvester according to the present invention, the oscillating sorting device is provided between the left and right side plates, and of the left and right side plates, the left and right outer side plates are provided with openings that, in a side view, include at least a portion of the grain sieve within their opening range. [Effects of the Invention]

[0011] According to the present invention, the sorting accuracy of threshed material in the sorting section can be improved. [Brief explanation of the drawing]

[0012] [Figure 1] This is a left side view of a combine harvester according to one embodiment of the present invention. [Figure 2] This is a right side view of a combine harvester according to one embodiment of the present invention. [Figure 3] This is a plan view of a combine harvester according to one embodiment of the present invention. [Figure 4] This figure shows the power transmission configuration in a combine harvester according to one embodiment of the present invention. [Figure 5] This is a left side cross-sectional view showing the configuration of the threshing and sorting sections according to one embodiment of the present invention. [Figure 6] This is a left side cross-sectional view showing the configuration of the sorting unit according to one embodiment of the present invention. [Figure 7] This is a plan cross-sectional view showing the configuration of a grain sieve and its vicinity according to one embodiment of the present invention. [Figure 8] This is a schematic front partial cross-sectional view showing the support structure of a chaff fin according to one embodiment of the present invention. [Figure 9] This is a left side view showing the front and rear intermediate section of an oscillating sorting device according to one embodiment of the present invention. [Figure 10] This is a left side view showing the operating structure of a chaff sieve according to one embodiment of the present invention. [Figure 11] This is an explanatory diagram of the operating state of the operating arm in one embodiment of the present invention. [Figure 12] This is a left side view showing a part of the sorting section in one embodiment of the present invention. [Figure 13] This is an exploded rear cross-sectional view showing the mounting structure of a lid cover according to one embodiment of the present invention. [Figure 14] This is a left side view showing a modified configuration of the oscillating sorting device according to one embodiment of the present invention. [Modes for carrying out the invention]

[0013] Using FIGS. 1 to 5, the overall configuration of the combine 1 according to this embodiment will be described. In the following description, the left side (the lower side in FIG. 3) and the right side (the upper side in FIG. 3) facing the front of the combine 1 are defined as the left side and the right side of the combine 1, respectively.

[0014] As shown in FIGS. 1 and 2, the combine 1 according to this embodiment is a standard combine as a harvesting machine that scoops up the harvested crops (such as rice, wheat, soybeans, corn, etc.) in the field into the machine body, threshes, sorts, stores the grain, and can be carried out of the machine as appropriate. The combine 1 includes a self - propelled traveling machine body 2 and a cutting unit 3 provided at the front end of the traveling machine body 2. The cutting unit 3 is configured as a cutting device that takes in uncut cereal straws such as rice and wheat while cutting them, and is attached to the traveling machine body 2 so as to be able to move up and down.

[0015] The traveling machine body 2 includes a traveling unit 4 configured as a crawler - type traveling device having a pair of left and right crawler units 5, 5. A machine body frame 6 is installed between the left and right crawler units 5, 5. Each crawler unit 5 has a plurality of rotating bodies including a drive sprocket 5a provided at its front end, and a crawler 5c wound around these rotating bodies. The drive sprocket 5a is rotationally driven by receiving the transmission of power from the engine 25 provided in the combine 1.

[0016] On the left side of the machine body frame 6, there are provided a threshing unit 7 that threshes the cereal straws cut and supplied by the cutting unit 3, and a sorting unit 8 that sorts the grains threshed by the threshing unit 7. The threshing unit 7 and the sorting unit 8 are arranged in a manner such that the threshing unit 7 is in the upper stage and the sorting unit 8 is in the lower stage behind the cutting unit 3.

[0017] On the machine frame 6, a grain storage section 9 is provided to the right of the threshing section 7 and sorting section 8, and has a grain tank 10 for storing grain (clean grain) sorted in the sorting section 8. Inside the grain tank 10, a lower discharge conveyor 11 is provided to transport the stored grain toward the discharge port of the grain tank 10 (see Figure 4). A vertical conveyor 12 is erected vertically so as to communicate with the discharge port of the grain tank 10. A grain discharge conveyor 13 is connected to the upper end of the vertical conveyor 12. The grain discharge conveyor 13 is provided so as to be able to rotate horizontally and swing up and down around a horizontal axis. The grain in the grain tank 10 is transported by these conveyors and discharged from a paddy input port 14 provided at the tip of the grain discharge conveyor 13 to the bed of a truck or a container.

[0018] On the machine frame 6, the driver's compartment 15 is located in front of the grain storage section 9, that is, in the front right position on the machine frame 6, where the operator sits. The driver's compartment 15 is covered by a cabin 16. The driver's compartment 15 is equipped with a driver's seat 17, a steering wheel 18 located in front of the driver's seat 17, and various operating parts such as a main gear lever 19, a sub-gear lever, and a work clutch lever (see Figure 2). The work clutch lever is an operating tool for engaging and disengaging the threshing clutch 57 and the harvesting clutch 75 (see Figure 4).

[0019] Below the control unit 15 on the aircraft frame 6, an engine 25 is provided as the power source. The engine 25 is located in the space below the control unit 15, on the front right side of the aircraft frame 6. The engine 25 is, for example, a diesel engine.

[0020] The harvesting unit 3 will now be described. The harvesting unit 3 includes a feeder 30 as a conveying device, a platform 31 as a grain header, a cutting blade device 32, a pair of left and right grass dividers 33, 33, and a raking reel 34.

[0021] The feeder 30 is a supply and conveying device that transports the grain stalks harvested in the harvesting section 3 and supplies them to the threshing section 7. The feeder 30 has a feeder house 35 as a housing and a conveyor 36 for transporting grain stalks (see Figure 4) provided inside the feeder house 35. The feeder house 35 is configured as a roughly rectangular tube with its longitudinal direction as the front-to-back direction in a plan view. The feeder 30 is located to the left of the cabin 16 (see Figure 3) and is provided with the rear end opening of the feeder house 35 communicating with the front threshing opening 7a of the threshing section 7 (see Figure 1).

[0022] The platform 31 is configured in a horizontally elongated bucket shape and is connected to the front side of the feeder 30 so as to communicate with the front end opening of the feeder house 35. A scraping auger (platform auger) 37 is provided inside the platform 31. The scraping auger 37 is mounted on an axis so as to be rotatable with the left-right direction as the axis of rotation.

[0023] The cutting blade device 32 is provided on the front lower edge of the platform 31 and is configured in the shape of a clipper. The pair of left and right grass dividers 33, 33 are provided so as to protrude forward from the left and right sides of the front of the platform 31. The raking reel 34 is a reel with a tine bar and is provided in a position in front and above the raking auger 37. The raking reel 34 is supported so as to be rotatable with the left-right direction as the axis of rotation between the tips of a pair of left and right reel support arms 34a, 34a, whose base ends are pivotally supported on the platform 31. The raking reel 34 rotates and continuously acts on the podded portion of the grain stalk, raking the podded portion of the grain stalk towards the raking auger 37. Power from the engine 25, transmitted via various transmission mechanisms, is used for the operation of each part of the cutting unit 3.

[0024] A front rotor 26 is provided at the rear of the feeder 30 to feed the stalks of grain being transported by the conveyor 36 to the threshing opening 7a. The front rotor 26 is located between the end of the conveyor 36 and the threshing opening 7a. The front rotor 26 has a roughly cylindrical rotor body 27, also called a beater, and a front rotor shaft 28 (see Figure 4) whose axis is oriented in the left-right direction. The stalks of grain transported by the feeder 30 are fed from the end of the conveyor 36 through the threshing opening 7a into the threshing chamber 7b of the threshing unit 7 by the front rotor 26.

[0025] The conveyor 36 inside the feeder house 35 has a harvesting unit input shaft (feeder house conveyor shaft) 38, which is located at the front of the threshing unit 7 and has its axial direction in the left-right direction, as a drive shaft that pivots at the end of the feeder house. The rear end of the feeder 30 is supported so as to be rotatable relative to the traveling machine body 2, with the harvesting unit input shaft 38 as the pivot axis. In addition, a lifting cylinder 39 (see Figure 1), which is a hydraulic cylinder, is interposed between the lower surface of the feeder house 35 and the machine frame 6.

[0026] The harvesting unit 3 is designed to move up and down by the rotation of the feeder 30 relative to the traveling machine body 2, which occurs as a result of the extension and retraction of the lifting cylinder 39. The height of the harvesting unit 3 is adjusted by the lifting and lowering of the harvesting unit 3, with the harvesting unit input shaft 38 as the pivot axis. The lifting and lowering of the harvesting unit 3 is operated by a predetermined operating unit provided on the driver's unit 15.

[0027] The threshing section 7 and the sorting section 8 will now be described. The threshing section 7 has a threshing drum 40 located in a threshing chamber 7b with a threshing opening 7a facing forward, and a receiving net 42 positioned below the threshing drum 40. The threshing chamber 7b is formed by a machine frame 21 provided on the machine frame 6.

[0028] The threshing drum 40 is rotatably supported by a threshing drum shaft 41 whose axis is oriented in the front-rear direction. As shown in Figure 5, the threshing drum 40 has a cylindrical main body with the threshing drum shaft 41 aligned along its central axis, and a plurality of threshing drum rods 40a protrude from the outer circumferential surface of the main body. On the upper side of the threshing drum 40, a plurality of dust supply valves 22 for adjusting the conveying speed (residence time) of the threshed grain in the threshing chamber 7b are provided so as to be angle-adjustable relative to the top surface 7c of the threshing chamber 7b. The receiving net 42 is for allowing the grain to leak out and is provided so as to be along the outer circumferential surface of the lower part of the threshing drum 40.

[0029] The sorting unit 8 includes an oscillating sorting device 43, which is positioned below the threshing unit 7 via a receiving net 42, an oscillating mechanism 44 including an oscillating shaft 44a, a first conveyor 45, a second conveyor 46, and a winnowing machine 47 (see Figure 5). The oscillating mechanism 44 rotates the oscillating shaft 44a with rotational power from a drive source, causing the oscillating sorting device 43 to oscillate back and forth in a predetermined direction which is the front-to-back direction in a plan view. A secondary winnowing machine 71 is provided as a pre-fan in front of and above the winnowing machine 47. A second fan 72 is provided behind the winnowing machine 47, in a position between the first conveyor 45 and the second conveyor 46 in the front-to-back direction.

[0030] The oscillating sorting device 43 has a configuration for specific gravity sorting, which includes an upper grain pan 111, a chaff sieve 120 positioned behind the upper grain pan 111 to adjust the amount of grain that leaks out (the amount that falls out) for rough sorting, a lower grain pan 112 positioned below the chaff sieve 120, and a grain sieve 130 positioned below the chaff sieve 120.

[0031] The first conveyor 45 is positioned within the first trough 45b, which extends in the machine width direction, to collect the first grain (first grade). The second conveyor 46 is positioned behind the first conveyor 45 and is positioned within the second trough 46b, which extends in the machine width direction, to collect the second grain (second grade). The winnowing machine 47 blows sorting air to the oscillating sorting device 43, which exits from the front lower to the rear upper.

[0032] A return conveyor 48 is provided on the right side of the machine body where the threshing section 7 and sorting section 8 are located (see Figure 4). The return conveyor 48 is connected to the second conveyor 46 with its lower end positioned near the second conveyor 46, and its upper end is positioned near the front end of the threshing drum 40, extending in an upward sloping manner. To the right of the return conveyor 48 is a vertically extending grain lifting conveyor 49. The grain lifting conveyor 49 transports the first grain, which has been sent by the first conveyor 45, into the grain tank 10.

[0033] The combine harvester 1, having the configuration described above, raises the harvesting unit 3 to a desired height (the harvesting height of the grain stalks) relative to the ground by the raising and lowering motion of the feeder 30, with the harvesting unit input shaft 38 as the central pivot shaft, in the field, and moves from a non-working state to a working state, in which state it moves on the traveling machine body 2. As a result, the combine harvester 1 separates the harvested crop into those to be harvested and those not to be harvested by the left and right dividers 33, 33, and while the pod-bearing portion of the grain stalks to be harvested is raked in by the raking reel 34, the pod-bearing portion of the grain stalks is cut by the cutting blade device 32.

[0034] The podded portions of the grain stalks, harvested at the desired cutting position, are raked into the platform 31 by a rotating auger 37. The auger 37's feeding action also gathers the stalks near the intake of the feeder house 35 within the platform 31, where they are then drawn into the feeder house 35. The grain stalks drawn into the feeder house 35 are then transported by a conveyor 36 through the feeder house 35 to the threshing opening 7a by the front rotor 26, and supplied to the threshing unit 7.

[0035] The podded portions of the grain stalks supplied to the threshing unit 7 are threshed by the threshing unit 7. Specifically, the grain stalks supplied to the threshing unit 7 are conveyed backward by the rotating threshing drum 40, and are threshed mainly between the threshing drum 40 and the receiving screen 42. Threshed grains smaller than the mesh size of the receiving screen 42 leak through the receiving screen 42. Straw and other debris that do not leak through the receiving screen 42 are discharged into the field through the dust outlet 8a (see Figure 5) located at the rear of the sorting unit 8 by the conveying action of the threshing drum 40.

[0036] Meanwhile, the grains that have been threshed in the threshing section 7 and have leaked out of the receiving screen 42 are sorted in the sorting section 8. Specifically, the threshed grains that have been threshed in the threshing drum 40 and have leaked out of the receiving screen 42 are sorted into fine grains (first grade), grains with stems and other parts attached and mixed with straw (second grade), and straw scraps, etc., by the specific gravity sorting action of the oscillating sorting device 43 and the wind sorting action of the winnowing machine 47, and then removed.

[0037] The grain (first-grade) that falls from the oscillating sorting device 43 after sorting in the sorting section 8 is transported to the grain tank 10 by the first conveyor 45 and the connected lifting grain conveyor 49. The second-grade grain is returned to the threshing start end of the threshing drum 40 by the second conveyor 46 and the connected return conveyor 48, where it undergoes threshing again. Straw and other debris are discharged into the field through a dust discharge port located at the rear of the sorting section 8.

[0038] Next, the power transmission configuration of the combine harvester 1 according to this embodiment will be explained with reference to Figure 4. The combine harvester 1 uses the rotational power of the engine 25 to drive the harvesting unit 3, the traveling unit 4, the threshing unit 7, the sorting unit 8, and the grain storage unit 9.

[0039] 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 sorting section 8, and the harvesting section 3. The rotational power of the second output shaft 25b is transmitted to the grain storage section 9. The engine 25 also has a work equipment pump shaft that drives a charge pump 54 which operates the lifting cylinder 39 and the like.

[0040] Regarding the power transmission system to the running section 4, the rotational power of the first output shaft 25a is transmitted to the HST input shaft 52 by the first belt transmission mechanism 51 and input to the transmission 53, which includes the running HST and the turning HST. Here, "HST" refers to a hydraulic continuously variable transmission that employs a method of converting hydraulic pressure generated by driving a hydraulic pump back into rotational force using a hydraulic motor. The driving force of the transmission 53 rotates the drive sprocket 5a of the crawler section 5 that constitutes the running section 4.

[0041] Regarding the power transmission system to the threshing unit 7, the rotational power of the first output shaft 25a is transmitted to the threshing unit input shaft 56 by the second belt transmission mechanism 55. The second belt transmission mechanism 55 is provided with a threshing clutch 57 that transmits the rotational power of the first output shaft 25a to the threshing unit input shaft 56 intermittently as needed.

[0042] The rotational power of the threshing unit input shaft 56 is transmitted to the threshing drum input shaft 59 by the third belt transmission mechanism 58. The rotational power of the threshing drum input shaft 59 is transmitted to the threshing drum shaft 41 via the threshing speed change device 60, through a first bevel gear 115 fixed to the threshing drum input shaft 59 and a second bevel gear 116 fixed to the threshing drum shaft 41. The threshing speed change device 60 performs a two-stage speed change, for example, between high speed and low speed, for the rotational power input from the threshing drum input shaft 59 to the threshing drum shaft 41.

[0043] With this configuration, the driving force of the engine 25 is transmitted to the threshing unit 7. Then, by operating the work clutch lever provided on the driver's unit 15, the threshing clutch 57 is turned ON / OFF, thereby intermittently transmitting power to the threshing unit 7.

[0044] Regarding the power transmission system to the sorting section 8, the threshing section input shaft 56 has a support shaft for the winnowing machine 47, and the rotational power of the threshing section input shaft 56 is transmitted by the fourth belt transmission mechanism 61 to a pulley rotating body 63 supported on the threshing intermediate shaft 62. The rotational power of the pulley rotating body 63 is transmitted to the auxiliary winnowing machine 71 and the winnowing machine 47 by a predetermined transmission mechanism. In addition, the rotational power of the threshing section input shaft 56 is transmitted by a predetermined transmission mechanism to the rotating shafts of the first conveyor 45, the second fan 72, and the second conveyor 46, respectively.

[0045] The rotational power of the first conveyor 45 is transmitted to the grain lifting conveyor 49 by a predetermined transmission mechanism. The rotational power of the second conveyor 46 is transmitted to the oscillating shaft 44a of the oscillating mechanism 44 by the fifth belt transmission mechanism 64. The rotational power of the second conveyor 46 is transmitted to the return conveyor 48 via a bevel gear.

[0046] Regarding the power transmission system to the harvesting unit 3, the rotational power of the pulley rotating body 63 is transmitted to the front rotor shaft 28 by the sixth belt transmission mechanism 73. The sixth belt transmission mechanism 73 is equipped with a harvesting clutch 75 that transmits the rotational power of the pulley rotating body 63 to the front rotor shaft 28 intermittently as needed. The rotational power of the front rotor shaft 28 is transmitted to the harvesting unit input shaft 38 by the first chain transmission mechanism 65. The rotational drive of the harvesting unit input shaft 38 operates the conveyor 36 inside the feeder house 35.

[0047] The rotational power of the harvesting unit input shaft 38 is transmitted to the PF (platform) drive shaft 67 via the second chain transmission mechanism 66. The rotational power of the PF drive shaft 67 is transmitted to the PF auger shaft 37a, which rotates the raking auger 37, via the third chain transmission mechanism 68. The rotational power of the PF drive shaft 67 is also transmitted to the cutting blade drive shaft 32a, which drives the cutting blade device 32, via the seventh belt transmission mechanism 69. Furthermore, the rotational power of the PF drive shaft 67 is transmitted to the reel shaft 34b, which rotates the raking reel 34, via the fourth chain transmission mechanism 76, which includes the reel counter shaft 70.

[0048] With this configuration, the driving force of the engine 25 is transmitted to the harvesting unit 3. Then, by operating the work clutch lever provided on the driver unit 15, the harvesting clutch 75 is turned ON / OFF, and the power transmission to the harvesting unit 3 is interrupted.

[0049] Regarding the power transmission system to the grain storage section 9, the rotational power of the second output shaft 25b is transmitted to the lower discharge conveyor 11 by a power transmission mechanism including the grain tank intermediate shaft 77, and the rotational power of the lower discharge conveyor 11 is transmitted to the vertical conveying conveyor 12 via bevel gears. The rotational power of the vertical conveying conveyor 12 is transmitted to the grain discharge conveyor 13 by a predetermined transmission mechanism. The grain storage section 9 is equipped with a suction fan 78 and a compressor 79, which are driven by the rotational power transmitted from the grain tank intermediate shaft 77.

[0050] As described above, the combine harvester 1 according to this embodiment includes a threshing unit 7 for threshing crops, an oscillating sorting device 43 for sorting the threshed material threshed by the threshing unit 7, and a winnowing machine 47 for blowing sorting air to the oscillating sorting device 43. The oscillating sorting device 43 includes a chaff sieve 120 for sorting the threshed material and a grain sieve 130 provided below the chaff sieve 120 for sorting the threshed material sorted by the chaff sieve 120.

[0051] Thus, the combine harvester 1 is configured as a threshing apparatus that includes a winnowing machine 47 that sends sorting air to an oscillating sorting device 43 for sorting the threshed material (hereinafter also simply referred to as "processed material") that has leaked down from the receiving net 42 of the threshing chamber 7b, and a grain sieve 130 that allows the first material to leak down from the oscillating sorting device 43. The configuration of the oscillating sorting device 43 will be explained below with reference to Figures 5 to 11.

[0052] The oscillating sorting device 43 has a frame 140 that is configured to be roughly rectangular in shape with the front-to-back direction as the longitudinal direction when viewed from above, and the oscillating sorting plate that oscillates in the front-to-back direction when viewed from above. The frame 140 has left and right side plates 141, a front plate portion 142 provided between the front ends of the left and right side plates 141, and a rear plate portion 143 provided between the rear ends of the left and right side plates 141, and these plate portions are configured to be roughly rectangular in shape.

[0053] The side plate 141 is a long plate-shaped member with its longitudinal direction in the front-to-back direction. In a side view, its upper edge is horizontal, and its lower front edge is sloped upwards. The side plate 141 has a vertical surface with its thickness direction in the left-to-right direction, and has an inner surface 141a and an outer surface 141b. Various sorting components that constitute the oscillating sorting device 43 are provided between the left and right side plates 141.

[0054] As shown in Figure 7, the oscillating sorting device 43 is installed between the left and right side plate sections 139 that extend from the threshing section 7 to the sorting section 8. The oscillating sorting device 43 is installed so that the left and right side plates 141 of the frame 140 are positioned parallel to the side plate sections 139 and near the left and right inner sides of the side plate sections 139.

[0055] The frame 140 is connected to the rocking mechanism 44 at the lower rear end. The operation of the rocking mechanism 44 causes the frame 140 and the various sorting components supported by it to rock together as a single unit.

[0056] An upper grain pan 111 is provided at the front end between the left and right side plates 141. The upper grain pan 111 has a main body portion 111a made up of a substantially horizontal plate-shaped member that is installed between the left and right side plates 141. The upper grain pan 111 is installed in a state where it is fixed to the left and right side plates 141 by fasteners such as bolts or by welding.

[0057] A guide plate 111b that acts on the grain is erected on the main body 111a of the upper grain pan 111. Behind the main body 111a, a sieving section 111c is provided, which forms the rear part of the upper grain pan 111, and is made up of multiple sieving wires arranged in a comb-like pattern, forming a narrow, straight plate-like section, and extends backward (upward and diagonally backward). The multiple sieving wires that make up the sieving section 111c are arranged in parallel with a predetermined interval between them in the left-right direction. The upper grain pan 111 receives the processed material that falls from the receiving net 42 and moves it backward while leveling the processed material as the oscillating sorting device 43 oscillates.

[0058] A lower grain pan 112 is provided below the upper grain pan 111 and below the front part of the chaff sieve 120. The lower grain pan 112 is a bent plate-shaped member installed between the left and right side plates 141. The lower grain pan 112 is installed in a state where it is fixed to the left and right side plates 141 by fasteners such as bolts or by welding.

[0059] The lower grain pan 112 has a front grain pan portion 112a and a rear grain pan portion 112b that forms an obtuse angle with the front grain pan portion 112a, and these surfaces form a bent shape in side view. The front grain pan portion 112a is the part that slopes downward to the rear along the slope of the front-lower edge of the side plate 141 in side view, and forms the front part of the lower grain pan 112. The rear grain pan portion 112b is located below the front of the chaff sieve 120 and is provided horizontally, forming the rear part of the lower grain pan 112. In the front-rear direction, the front part of the lower grain pan 112 is located below the rear of the main body portion 111a of the upper grain pan 111, and the rear part extends rearward from the upper grain pan 111.

[0060] In the vertical direction, a chaff sieve 120 is provided at a height between the upper grain pan 111 and the lower grain pan 112. The chaff sieve 120 is configured to roughly sort the processed material and adjust the amount of material that leaks out, and has a plurality of fins, which are chaff fins 121.

[0061] The chaff fin 121 is a narrow, rectangular plate-shaped member with its longitudinal direction running horizontally, and is installed between the left and right side plates 141 in a forward-sloping orientation. Multiple chaff fins 121 (for example, more than twenty) that make up the chaff sieve 120 are arranged in parallel with a predetermined interval between them. The chaff sieve 120 is configured to allow adjustment of the inclination angle of the multiple chaff fins 121.

[0062] The chaff sieve 120 has its front chaff fins 121 positioned near the rear end of the upper grain pan 111, and its rear chaff fins 121 positioned behind the rear end of the grain sieve 130. As the oscillating sorting device 43 oscillates, the chaff sieve 120 sieves the material sent from the upper grain pan 111, separating it by specific gravity and separating grain from impurities.

[0063] The structure for adjusting the inclination angle of the multiple chaff fins 121 in the chaff sieve 120 will be described. The chaff sieve 120 has a mounting side plate 122 and a connecting side plate 123 as members that support the multiple chaff fins 121 from both the left and right sides. Both the mounting side plate 122 and the connecting side plate 123 are narrow plate-shaped members that extend along the inclination direction of the chaff sieve 120 in a side view, and are arranged parallel to each other with the mounting side plate 122 on the upper side and the connecting side plate 123 on the lower side.

[0064] The mounting side plate 122 is fixed to the side plate 141 of the oscillating sorting device 43 by bolts 124 (see Figure 8). The fixing points by bolts 124 are provided at multiple locations at predetermined intervals in the extension direction of the mounting side plate 122.

[0065] As shown in Figure 8, the mounting side plate 122 has a fixed surface portion 122a which overlaps the side plate 141 from the inner surface 141a side and through which the bolt 124 passes, an inclined surface portion 122b which is bent inward on both the left and right sides from below the fixed surface portion 122a, and a support surface portion 122c which extends downward from below the inclined surface portion 122b and is parallel to the fixed surface portion 122a, and these surfaces form a cross-sectional shape that is bent in a roughly crank shape. The bolt 124 passes through the fixed surface portion 122a of the mounting side plate 122 and the side plate 141 from the left and right inner sides and is screwed into a nut portion 125 provided on the outer surface 141b side of the side plate 141.

[0066] The connecting side plate 123 is connected to the mounting side plate 122 via a plurality of chaff fins 121 and is movably mounted. Each chaff fin 121 is rotatably supported on both the left and right sides of its upper edge by an upper pivot shaft 126 oriented axially in the left-right direction relative to the left and right mounting side plates 122. The upper pivot shaft 126 protrudes outward to the left and right at both ends of the chaff fin 121 and penetrates the support surface portion 122c of the mounting side plate 122. The upper pivot shaft 126 is rotatably supported relative to the mounting side plate 122 by a locking member, such as a locking pin (not shown), which penetrates the portion of the upper pivot shaft 126 that protrudes from the support surface portion 122c.

[0067] Furthermore, each chaff fin 121 is rotatably supported on both the left and right sides of its lower edge by a lower pivot shaft 127 oriented axially in the left-right direction relative to the left and right connecting side plates 123. The lower pivot shaft 127 protrudes outward to the left and right at both ends of the chaff fin 121 and penetrates the connecting side plates 123. The lower pivot shaft 127 is rotatably supported relative to the connecting side plates 123 by a locking member, such as a locking pin (not shown), which penetrates the portion of the connecting side plate 123 that protrudes from the connecting side plate 123.

[0068] Thus, the chaff fins 121 of the chaff sieve 120 are each supported by an upper pivot axis 126 on the mounting side plate 122 as a fixed support axis, and a lower pivot axis 127 on the connecting side plate 123 as a movable support axis, and are connected by the connecting side plate 123 on the movable side. The chaff fins 121 then rotate in a parallel link configuration, maintaining a parallel state to each other as the connecting side plate 123, which is connected to the lower pivot axis 127, moves back and forth.

[0069] In this configuration, as the connecting side plate 123 moves back and forth, each chaff fin 121 rotates around the upper pivot axis 126, and the inclination angle of the chaff fin group 121 (hereinafter referred to as "chaff angle") changes. The chaff sieve 120 receives an operation to change the chaff angle, that is, an operation to move the connecting side plate 123 back and forth, at a predetermined operating fin 121A located at the front of the chaff sieve 120, among the multiple chaff fins 121. This operation is a rotational operation of the operating fin 121A around the upper pivot axis 126.

[0070] A chaff angle adjustment unit 150 that acts on the operating fin 121A is provided on the outer side (left side) of the left side plate 141L of the left side plate 141 (see Figure 9). The chaff angle adjustment unit 150 has a chaff operating arm 151 provided on the outer surface 141b side of the side plate 141L as an operating member for adjusting the chaff angle.

[0071] As shown in Figure 10, the chaff dispensing arm 151 has a front arm portion 151a and a rear arm portion 151b, and these arm portions form a roughly right-angle bend with the upper side convex when viewed from the side. Both the front arm portion 151a and the rear arm portion 151b are composed of longitudinal plate-like members with the left-right direction being the thickness direction.

[0072] The chaff dispensing arm 151 is provided with a first arm support shaft 153 located at the bent portion (top) formed by the front arm portion 151a and the rear arm portion 151b, so that it rotates integrally with the left-right direction as the axis of rotation. In other words, the chaff dispensing arm 151 is configured as an integral rotating body that rotates around the axis of the first arm support shaft 153 while keeping the angle between these arm portions constant. The first arm support shaft 153 is provided coaxially with the upper rotation shaft 126 of the operating fin 121A and serves as a fixed support shaft for the chaff dispensing arm 151.

[0073] The front arm portion 151a extends downward and forward from the first arm support shaft 153, and the rear arm portion 151b extends downward and rearward from the first arm support shaft 153. The rear arm portion 151b has an arm length approximately 2 to 3 times that of the front arm portion 151a.

[0074] The end of the front arm portion 151a opposite to the first arm support shaft 153 (the tip side) is connected to the lower pivot shaft 127 of the operating fin 121A via a second arm support shaft 154, which is oriented axially in the left-right direction. The second arm support shaft 154 is provided coaxially with the lower pivot shaft 127 of the operating fin 121A, with its left and right outer (left side) portions connected to the tip of the front arm portion 151a, and its left and right inner (right side) portions connected to the lower pivot shaft 127 of the operating fin 121A.

[0075] With the above configuration, the chaff operating arm 151 rotates around the first arm support shaft 153 (see Figure 10, arrow A1), causing the operating fin 121A to rotate around the upper pivot shaft 126 via the second arm support shaft 154. As a result, the group of chaff fins 121 connected via the connecting side plate 123 rotates around the upper pivot shaft 126, changing the chaff angle.

[0076] The chaff angle is adjusted by adjusting the rotational position (rotational position) of the chaff operating arm 151 around the first arm support shaft 153. The rotational position of the chaff operating arm 151 is fixed by a bolt 156 that passes through the end of the rear arm portion 151b opposite to the first arm support shaft 153 (the tip side) and is screwed into a screw hole 155 provided in the side plate 141L. Multiple screw holes 155 are provided to fix the chaff operating arm 151 at different rotational positions, and the rotational position of the chaff operating arm 151, i.e., the chaff angle, is adjusted by selecting the screw hole 155 used to fix the chaff operating arm 151.

[0077] As shown in Figure 10, in a left side view, the more the chaff operating arm 151 is positioned clockwise (see arrow B1), that is, the more the tip of the rear arm portion 151b is positioned downwards, the more the second arm support shaft 154 is positioned forward and upwards (see arrow C1), the more the chaff fins 121 are tilted, and the gap between adjacent chaff fins 121 becomes narrower. Conversely, in a left side view, the more the chaff operating arm 151 is positioned counterclockwise (see arrow B2), that is, the more the tip of the rear arm portion 151b is positioned upwards, the more the second arm support shaft 154 is positioned rear and downwards (see arrow C2), the more the chaff fins 121 are upright, and the wider the gap between adjacent chaff fins 121 becomes.

[0078] In this embodiment, the screw holes 155 are provided in five locations, from the first to the fifth screw holes 155A to 155E, allowing the chaff angle to be adjusted in five stages. The first screw hole 155A is the screw hole 155 that positions the chaff fin 121 in its most reclined state, and the chaff fin 121 becomes more upright in the order of the first screw hole 155A, second screw hole 155B, third screw hole 155C, fourth screw hole 155D, and fifth screw hole 155E.

[0079] The state shown in Figure 10 is when the chaff dispensing arm 151 is fixed using the third screw hole 155C. Figure 11A shows the state when the chaff dispensing arm 151 is fixed using the first screw hole 155A, that is, when the chaff fin 121 is in its most reclined position. Figure 11B shows the state when the chaff dispensing arm 151 is fixed using the fifth screw hole 155E, that is, when the chaff fin 121 is in its most upright position. In Figures 11A and 11B, the chaff dispensing arm 151 fixed using the third screw hole 155C is indicated by a dashed line.

[0080] Regarding the formation locations of the five screw holes 155, in order to avoid interference between the screw holes 155, the five screw holes 155 are arranged so that their radial positions on the circumference of the chaff operating arm 151, which coincides with the axis of the first arm support shaft 153, differ depending on the relationship between the hole diameter of the screw holes 155, the magnitude of the adjustment angle of one stage of the chaff angle (approximately 3° in this embodiment), and the arm length of the rear arm portion 151b. Therefore, with respect to the penetration position of the bolt 156 into the rear arm portion 151b, the penetration position in the longitudinal direction of the rear arm portion 151b differs depending on the screw hole 155 used. To allow for such changes in the penetration position of the bolt 156 into the rear arm portion 151b, an elongated hole 151c is formed in the rear arm portion 151b along the longitudinal direction of the rear arm portion 151b as a hole through which the bolt 156 passes.

[0081] As described above, the chaff angle adjustment unit 150 makes it possible to adjust the chaff angle of the chaff sieve 120. In particular, in this embodiment, the arrangement of the five screw holes 155 as described above makes it possible to adjust the chaff angle in five stages with relatively fine angle intervals.

[0082] As shown in Figure 6, a front guide plate section 145 is provided, which forms a downward sloping surface towards the first conveyor 45, extending from the lower rear of the chaff sieve 120 to the lower part of the grain sieve 130. The front guide plate section 145 is made up of a metal plate-like member or a rubber sag made of an elastic material such as rubber. The threshed grain (first batch) that falls from the grain sieve 130 is guided to the first conveyor 45 by the front guide plate section 145.

[0083] Behind the chaff sieve 120, there are two straw racks 135, a front straw rack 135A and a rear straw rack 135B. The two straw racks 135 are located at the rear or rear end between the left and right side plates 141. The straw rack 135 is composed of a plurality of straw rack members 136 that are spaced apart at predetermined intervals in the left-right direction.

[0084] The straw rack member 136 is a plate-shaped member with a zigzag-like uneven shape on its upper side, and is installed with its front end fixed to a support member 137 that is installed between the left and right side plates 141. The straw rack member 136 of the rear straw rack 135B extends to the rear and is longer in front-to-back length than the straw rack member 136 of the front straw rack 135A. The front end of the straw rack member 136 of the rear straw rack 135B is located below the rear end of the straw rack member 136 of the front straw rack 135A, and the front and rear straw racks 135 are installed to be continuous in the front-to-back direction.

[0085] The straw rack 135 performs specific gravity separation on the threshed grain sent from the chaff sieve 120. The straw rack 135 is configured to allow secondary materials (such as grains with stems and ear fragments) that are lighter in specific gravity than the grain to flow down, while also sending the discarded straw and other materials outside the machine.

[0086] Below the front and rear straw racks 135, there is a rear guide plate section 146 that forms a downward sloping surface towards the second conveyor 46. The rear guide plate section 146 is made up of metal plate-like members or rubber sags made of elastic material such as rubber. The threshed grain that falls from the straw racks 135 is guided to the second conveyor 46 by the rear guide plate section 146.

[0087] The grain sieve 130 receives the grain threshed by the threshing unit 7 and is installed in the oscillating sorting device 43 as a sieve for sorting the first grain. Above the grain sieve 130 is a chaff sieve 120 having multiple chaff fins 121, and the grain sieve 130 further sorts the processed material sorted by the chaff sieve 120. The grain sieve 130 is located above the first conveyor 45 and distributes the processed material to be transported to the first conveyor 45 and the second conveyor 46.

[0088] As shown in Figures 6 and 7, the grain sieve 130 is a substantially flat plate-shaped member with a substantially rectangular plate-like outer shape. The grain sieve 130 has a width dimension (dimension in the left-right direction) corresponding to the distance between the left and right side plates 141, 141, and is provided in a range that extends substantially across the entire distance between the left and right side plates 141, 141 in the left-right direction.

[0089] The grain sieve 130 includes a plate-shaped grain sieve body portion 161 through which numerous holes 163 for sorting materials are formed. The grain sieve body portion 161 is a flat, porous portion that makes up substantially the entire grain sieve 130, which has a rectangular outer shape.

[0090] Numerous holes 163, which serve as openings, are formed through most of the grain sieve body 161, excluding the front and rear edges. These numerous holes 163 are basically arranged in a two-dimensional grid along the rectangular outer shape of the grain sieve 130. The grain sieve 130 allows grain to fall into the grain tank 10 through the holes 163, while leaving other impurities on the grain sieve 130. The holes 163 have an opening shape that is roughly square or roughly rectangular with rounded corners. However, the opening shape of the holes 163 is not particularly limited.

[0091] The grain sieve 130 has the front and rear edges of the grain sieve body portion 161 as areas where the holes 163 are not formed. In the grain sieve 130, lateral bent surfaces 164 are formed on both the left and right sides of the grain sieve body portion 161, bending downward at a right angle from the left and right ends of the grain sieve body portion 161.

[0092] The grain sieve 130 has its front end positioned below the rear end of the rear grain pan portion 112b of the lower grain pan 112. The grain sieve 130 also has its rear end positioned below and near the rear end of the chaff sieve 120.

[0093] In the configuration described above, the grain sieve 130 is rotatably mounted so as to move the upwind side (front side) of the sorting airflow from the winnowing machine 47 up and down, with the downwind side (rear side) of the sorting airflow from the winnowing machine 47 as the support shaft 138. That is, the grain sieve 130 is a substantially flat plate-shaped member as a whole, and is mounted so as to form a straight line sloping downwards in a side view, and is rotatably mounted with the downwind side (rear side of the machine) in the direction of transport of the processed material by the sorting airflow as the fulcrum (support shaft). The support configuration of the grain sieve 130 will be described below.

[0094] In the support shaft portion 138, the grain sheave 130 is rotatably supported at its rear edge by a support shaft 170 that is installed between the left and right side plates 141. The support shaft 170 is made up of a straight rod-shaped member with its axial direction in the left-right direction and a circular cross-section, and is fixed to the left and right side plates 141.

[0095] The grain sieve 130 has a shaft engagement portion 165 provided on the rear side of the grain sieve body portion 161 as an engagement portion with the support shaft 170. The shaft engagement portion 165 is a curved surface portion that forms an arc shape in side view (viewed in the axial direction of the support shaft 170), and is formed as a substantially cylindrical portion that extends in the left-right direction. The shaft engagement portion 165 is formed over the entire area of ​​the rear edge of the grain sieve body portion 161 in the left-right direction.

[0096] The shaft engagement portion 165 is formed to be continuous with the grain sheave body portion 161 by extending the plate-shaped portion that makes up the grain sheave body portion 161 and curving downward relative to the grain sheave body portion 161. The grain sheave 130 engages with the support shaft 170 by embracing the support shaft 170 in a manner in which the support shaft 170 passes through the shaft engagement portion 165.

[0097] Thus, the grain sieve 130 is provided with a support shaft portion 138 located on its rear side, allowing it to rotate within a predetermined angular range so that its front side moves up and down with the support shaft 170 as the pivot point (pivot shaft) (see Figure 6, arrow D1). In Figure 6, the up and down rotational movement of the grain sieve 130 by the support shaft portion 138 is shown with a dashed line when the grain sieve 130 is at the upper end and with a double dashed line when the grain sieve 130 is at the lower end. This is just one example, but the grain sieve 130 is provided with a reference position where it is tilted downwards at an angle of about 10° with respect to the horizontal, and is rotatable within a range of ±5° up and down from this reference position.

[0098] When the grain sieve 130 is at its raised end, the front end of the grain sieve 130 is located directly below the rear end of the rear grain pan portion 112b of the lower grain pan 112, and the lower grain pan 112 and the grain sieve 130 are substantially continuous in the front-to-back direction. In other words, when the grain sieve 130 is at its raised end, the grain sieve 130 is positioned along the rearward extension of the rear grain pan portion 112b of the horizontally positioned lower grain pan 112.

[0099] Furthermore, when the grain sieve 130 is in its reference position, a step is created between the rear end of the lower grain pan 112 and the front end of the grain sieve 130. This step creates a space that takes in the sorting air from the winnowing machine 47 between the lower grain pan 112 and the grain sieve 130 and guides the sorting air onto the grain sieve 130. When the grain sieve 130 is at its lowered end, the above step is maximized, and the amount of sorting air taken in to the upper side of the grain sieve 130 increases.

[0100] The support configuration of the grain sieve 130 by the support shaft portion 138 is not limited to this embodiment. In this embodiment, the shaft engagement portion 165 is provided over the entire range of the grain sieve body portion 161 in the left-right direction, but the shaft engagement portion 165 may be provided partially in the left-right direction or at multiple locations. Furthermore, as for the configuration of the support shaft portion 138, for example, a shaft portion with the left-right direction as the axial direction may be provided on the grain sieve 130 side, and this shaft portion may be rotatably supported relative to the side plate 141, thereby rotatably supporting the grain sieve 130 relative to the frame 140.

[0101] As described above, the grain sieve 130 is provided by the support shaft portion 138 so as to be able to rotate up and down with the rear end as the pivot center and the front end moving up and down, and the front support portion is used as an operating support portion 180 for operating the rotation of the grain sieve 130 (see Figure 9).

[0102] As shown in Figure 9, the operating support 180 is provided on the outside of the left side plate 141L. The operating support 180 has an operating arm 181 provided on the outer surface 141b side of the side plate 141L as an operating member for adjusting the rotation angle (hereinafter referred to as the "grain sheave angle") around the pivot shaft 138 of the grain sheave 130. The operating arm 181 is provided below the chaff operating arm 151.

[0103] The operating arm 181 has a lower arm portion 181a and an upper arm portion 181b, and these arm portions form an obtuse-angled bend with the front side convex when viewed from the side. The operating arm 181 is composed of a plate-like member whose left-right direction is the thickness direction and which has a bend due to the longitudinal portions that make up the lower arm portion 181a and the upper arm portion 181b.

[0104] The operating arm 181 is provided with an arm pivot support 183 located at the bent portion (top) formed by the lower arm portion 181a and the upper arm portion 181b, so that it can rotate integrally with the left-right direction as the axis of rotation. In other words, the operating arm 181 is configured as an integral rotating body that rotates around the axis of the arm pivot support 183 while keeping the angle between these arm portions constant. The arm pivot support 183 is configured to support the operating arm 181 so that it can rotate around a predetermined rotation axis P1 relative to the side plate 141L.

[0105] The lower arm portion 181a extends downward (rear-downward) from the arm pivot support portion 183, and the upper arm portion 181b extends upward from the arm pivot support portion 183. The lower arm portion 181a has an arm length approximately 1.5 times that of the upper arm portion 181b. The operating support portion 180 is provided so as not to interfere with the chaff operating arm 151 within its range of rotation.

[0106] The arm pivot support 183 is located near the horizontal lower edge 141c of the side plate 141L, and the operating arm 181 has its lower arm portion 181a extending downward from the lower edge 141c of the side plate 141L. The end of the lower arm portion 181a opposite to the arm pivot support 183 (the tip side) is connected to the front end of the grain sheave 130 via a grain sheave support shaft 184 oriented axially in the left-right direction.

[0107] The grain sieve 130 has its front portion extending downward from the lower edge 141c of the side plate 141L, and at its front end that protrudes downward from the side plate 141L, it is connected to the grain sieve support shaft 184, which penetrates the tip of the lower arm portion 181a. The grain sieve 130 is supported by the grain sieve support shaft 184 so as to be rotatable with respect to the lower arm portion 181a with the left-right direction as the pivot axis.

[0108] The grain sheave support shaft 184 has a shaft body portion 184a, which is the connecting portion to the grain sheave 130, and flange portions 184b, which are provided on the left and right outer sides (left side) of the shaft body portion 184a and are enlarged portions relative to the shaft body portion 184a. The grain sheave support shaft 184 has the shaft body portion 184a as a penetrating portion to the lower arm portion 181a, and the flange portions 184b are positioned on the left and right outer sides of the lower arm portion 181a.

[0109] With the above configuration, as shown in Figure 9, when the operating arm 181 rotates around the arm pivot 183 (around the rotation axis P1) (see arrows E1 and E2), the grain sheave 130 rotates around the pivot shaft 138 via the grain sheave support shaft 184 (see arrows F1 and F2), and the grain sheave angle changes. In Figure 9, the grain sheave 130 and operating arm 181 in the raised state are shown by the dashed line.

[0110] During the rotational movement of the interconnected operating arm 181 and grain sheave 130, the grain sheave support shaft 184 moves relative to the lower arm portion 181a, changing the distance between it and the arm shaft support portion 183. To allow for this change in the penetration position of the grain sheave support shaft 184 into the lower arm portion 181a, an elongated hole 181c is formed in the lower arm portion 181a along its longitudinal direction, serving as a hole through which the grain sheave support shaft 184 passes.

[0111] The angle of the grain sheave is adjusted by rotating the operating arm 181 around the arm pivot 183. The rotation of the operating arm 181 is performed by operating the grain sheave operating member 185, which is connected to the operating arm 181 via an operating wire 171. The grain sheave operating member 185 is an operating member for rotating the grain sheave 130 up and down around the pivot 138 via the operating arm 181.

[0112] The wire 171 is a so-called push-pull wire and has an inner wire 172, which is the wire body with wire ends at both ends, and an outer tube 173, which is a covering member that covers substantially the entire inner wire 172 except for both ends.

[0113] The outer tube 173 is fixed to predetermined locations at multiple points. In the example shown in Figure 9, a portion near one end of the outer tube 173 is supported by a wire stay 174 provided on the outer surface 141b of the side plate 141L. The inner wire 172 is movably mounted relative to the fixed outer tube 173.

[0114] One end of the inner wire 172 is connected to the tip of the upper arm portion 181b of the operating arm 181. The wire end 175, provided on one end of the inner wire 172, is pivotally supported on the tip of the upper arm portion 181b via a locking shaft 176, so as to be rotatable around the locking shaft 176. The locking shaft 176 is provided on either the upper arm portion 181b or the wire end 175, and rotatably supports the other side.

[0115] The wire 171 extends forward from the connection point to the operating arm 181 and is arranged along a predetermined path toward the driver unit 15. The other end of the inner wire 172 is connected to a grain sheave operating member 185 via a wire end (not shown). The grain sheave operating member 185 is, for example, an operating lever configured for tilting operation and is located in the driver unit 15 or near the driver unit 15, where it can be operated from within the driver unit 15 by an operator.

[0116] In the configuration described above, the inner wire 172 is pushed and pulled by the operation of the grain sheave operating member 185, and the pushing and pulling motion of the inner wire 172 causes the operating arm 181 to rotate around the arm pivot portion 183. As a result, the grain sheave 130 connected to the operating arm 181 rotates around the pivot portion 138.

[0117] As shown in Figure 9, in a left side view, when the operating arm 181 is rotated counterclockwise by the operation of the grain sheave operating member 185 (see arrow E1), the grain sheave 130 rotates in a direction that raises its front end around the support shaft portion 138 (see arrow F1). Conversely, in a left side view, when the operating arm 181 is rotated clockwise (see arrow E2), the grain sheave 130 rotates in a direction that lowers its front end around the support shaft portion 138 (see arrow F2).

[0118] As shown in Figures 6 and 7, the oscillating sorting device 43 has a lower grain pan 112 located in front of the grain sieve 130 to receive the threshed material that has leaked down from the chaff sieve 120. Behind the lower grain pan 112, there is a sieving section 190 in which a plurality of sieving wire sections 191 are arranged in parallel.

[0119] The sieving section 190 is provided in a range that extends substantially across the entire rear grain pan section 112b of the lower grain pan 112 in the left-right direction (see Figure 7). Therefore, the sieving section 190 is provided in a range that extends substantially across the entire area between the left and right side plates 141 in the left-right direction. The sieving section 190 is composed of two sieving members 195 arranged adjacent to each other on the left and right sides (see Figure 7).

[0120] The sieving member 195 is a bent plate-shaped member having a predetermined bend shape, and comprises a fixed plate portion 192 and a sieving body portion 193 including a plurality of sieving wire portions 191, and these portions form an obtuse-angled bent line shape when viewed from the side.

[0121] The fixed plate portion 192 is a rectangular plate-shaped portion with its longitudinal direction running horizontally, and its horizontal dimension is approximately half the horizontal dimension of the grain sieve 130. The sieve body portion 193 has a base portion 194 that forms the front edge of the sieve body portion 193 and a plurality of sieve wire portions 191 that extend rearward from the base portion 194, and has a comb-like shape.

[0122] The base portion 194 is a plate-shaped part formed in the same area as the fixed plate portion 192 in the left-right direction, and forms the extended base of a plurality of sieve wire portions 191. The base portion 194 is connected to the rear side of the fixed plate portion 192 and together with the fixed plate portion 192 forms an obtuse-angled bent surface portion. The sieve wire portion 191 is a narrow, straight portion extending from the base portion 194 in a predetermined direction. The plurality of sieve wire portions 191 are formed in the same plane as the base portion 194 and are arranged in parallel with predetermined intervals in the left-right direction.

[0123] The sieving member 195, which constitutes the sieving section 190, has its fixing plate portion 192 fixedly supported on the rear edge of the lower grain pan 112, that is, on the rear edge of the rear grain pan portion 112b. The sieving member 195 is fixed to the lower grain pan 112 by bolts 196 with the fixing plate portion 192 superimposed on the rear edge of the lower grain pan 112. The bolts 196 pass through the fixing plate portion 192 of the sieving member 195 and the rear edge of the lower grain pan 112, and are screwed into nuts 197 provided on the back (lower) side of the rear grain pan portion 112b. In each sieving member 195, the fixing portions by bolts 196 are provided at three locations in the left-right direction: both ends and the center of the fixing plate portion 192.

[0124] The sieve section 190 has multiple sieve wire sections 191 positioned between the front of the grain sieve 130 and the front-to-back intermediate section of the chaff sieve 120. In the sieve section 190, the multiple sieve wire sections 191 are arranged in an upward sloping manner so as to be approximately parallel to the grain sieve 130 in the reference position. In the example shown in Figure 6, the angle that the multiple sieve wire sections 191 make with respect to the horizontal direction is, for example, about 10°. The magnitude of the inclination angle of the sieve wire sections 191 with respect to the horizontal direction is not particularly limited.

[0125] The sieve section 190 is provided such that, in the front-to-back direction, the tips (rear ends) of the multiple sieve wire sections 191 are positioned above the front of the grain sieve 130, and it extends over approximately one-quarter of the front of the grain sieve 130. The extension length of the multiple sieve wire sections 191 is not particularly limited.

[0126] As described above, in the oscillating sorting device 43, a sieving section 190 is provided above the front of the grain sieve 130, consisting of two sieving members 195 attached to the rear side of the lower grain pan 112. In this embodiment, the sieving section 190 is composed of two sieving members 195 arranged adjacent to each other on the left and right, but the number of sieving members 195 constituting the sieving section 190 is not limited. The sieving section 190 may be composed of a single sieving member or of three or more sieving members.

[0127] Furthermore, the combine harvester 1 has the following configuration with respect to the grain sieve 130. Specifically, in the sorting section 8, the oscillating sorting device 43 is provided between the left and right side plates 139, and of the left and right side plates 139, the left outer side plate 139L has an opening 200 that includes at least a part of the grain sieve 130 in its opening range when viewed from the side (see Figure 12).

[0128] As shown in Figure 12, the opening 200 is a through-hole that opens the space between the left and right side plates 139 to the outside. The opening 200 is formed in the side plate 139L at a location corresponding to the grain sheave 130. The opening 200 has a roughly rounded rectangular shape with its longitudinal direction in the front-to-back direction (left-to-right direction in Figure 12).

[0129] The opening 200 has a horizontal upper edge 200a and a lower edge 200b that are aligned in the front-rear direction as its opening edge. At the opening edge of the opening 200, the rear side of the lower edge 200b is a downward sloping edge 200c. The opening 200 is formed such that the lower edge 141c of the side plate 141L of the oscillating sorting device 43 is positioned approximately in the center of its opening range in the vertical direction.

[0130] The opening 200 has a length sufficient to allow the grain sieve 130 to pass through. In other words, the grain sieve 130 is provided to be able to be moved in and out of its installation location through the opening 200. The opening 200 is used for installing and removing the grain sieve 130, as well as for internal inspection and maintenance.

[0131] The opening 200 is positioned such that, in the front-rear direction, its front opening edge is located directly in front of the operating arm 181 that supports the grain sieve 130, and its rear opening edge is located near the front of the pivot shaft portion 138 of the grain sieve 130. In a left side view, the opening 200 is formed to include the entirety or substantially the entirety of the operating arm 181 within its opening range. Furthermore, in a left side view, the opening 200 is formed to include the entirety of the portion of the grain sieve 130 that extends downward from the lower edge portion 141c of the side plate 141L within its opening range.

[0132] The opening 200 is normally closed by a lid cover 210. The lid cover 210 is detachably attached to the side plate portion 139L. The lid cover 210 is made up of a substantially rectangular plate-shaped member with the left-right direction as its longitudinal direction, and is provided so as to include the entire opening range of the opening 200 within the range of its outer shape. On the upper and lower edges of the rectangular outer shape of the lid cover 210, there are bent edges 212 that are bent at a right angle toward the left and right outward (left side) relative to the flat plate-shaped cover body portion 211, extending along the entire length in the front-rear direction.

[0133] As shown in Figures 12 and 13, the lid cover 210 is fixed to the side plate portion 139L by bolts 215 at the four corners or near the corners of its rectangular outer shape. The bolts 215 pass through the cover body portion 211 and the side plate portion 139L of the lid cover 210 and are screwed into nuts 216 provided on the inner (right) side surface 139a of the side plate portion 139L.

[0134] Thus, the opening 200 is configured to be openable and closable by a lid cover 210 which is detachably attached to the side plate portion 139L by bolts 215. By removing the bolts 215 and the lid cover 210, it becomes possible to access the grain sieve 130 through the opening 200.

[0135] In this embodiment, the opening 200 is formed so that substantially the entire grain sieve 130 is positioned within the opening range when viewed from the side. However, it may also be formed so that the entire grain sieve 130, including its rotational range, is positioned within the opening range. Furthermore, regarding the lid cover 210, by making the lid cover 210 entirely or partially from a transparent plate, it is possible to make it possible to see the inside of the sorting section from the outside through the opening 200 when the lid cover 210 is attached.

[0136] In Figure 12, the lid cover 210 is indicated by a dashed line. In Figure 13, the lid cover 210 and bolt 215 are shown in a removed state, and the lid cover 210 and bolt 215 are shown in an installed state by a dashed line.

[0137] According to the combine harvester 1 of this embodiment, which has the above configuration, the sorting accuracy of the threshed material in the sorting section 8 can be improved.

[0138] In the oscillating sorting device 43, the grain sieve 130 is provided so as to be able to rotate up and down around the support shaft 138. With this configuration, it is possible to change the inclination angle (grain sieve angle) of the grain sieve 130 according to the amount of material to be processed. This makes it possible to adjust the grain sieve angle according to the amount of material to be processed, the conditions and variety of the crop to be harvested, etc., thereby improving the sorting accuracy of the material.

[0139] When the flow rate of the material to be processed is relatively high, increasing the inclination angle (steepening the inclination) of the grain sieve 130 increases the height difference between the lower grain pan 112 and the grain sieve 130, and also increases the airflow of the sorting air from the winnowing machine 47 that is drawn into the grain sieve 130 from the front. As a result, the distance over which the material to be processed falls from the lower grain pan 112 onto the grain sieve 130 can be increased, thus increasing the time it is exposed to the sorting air and improving the sorting effect.

[0140] Furthermore, increasing the inclination angle of the grain sieve 130 suppresses the movement of the processed material against the inclination on the grain sieve 130, thereby promoting the leakage of the processed material from the grain sieve 130. This increases the amount of first-row material recovered by the first conveyor 45. Also, even when the amount of processed material is large, the amount of first-row material leakage from the grain sieve 130 can be ensured, thereby suppressing a decrease in sorting accuracy.

[0141] On the other hand, when the flow rate of the material being processed is relatively low, reducing the inclination angle of the grain sieve 130 (making the inclination gentler) promotes the movement of the material moving on the grain sieve 130, thereby suppressing leakage of the material from the grain sieve 130. This reduces the amount of excess space on the grain sieve 130 by leaving a certain level of sediment on the grain sieve 130, thus reducing the amount of foreign matter such as broken stalks falling from the grain sieve 130. As a result, the sorting accuracy of the material being processed can be improved.

[0142] Thus, with the combine harvester 1 equipped with the oscillating sorting device 43 according to this embodiment, the configuration that allows the tilt of the grain sieve 130 to be adjusted makes it possible to improve sorting accuracy while maintaining a compact structure, and enables sorting that can handle a wide variety of products.

[0143] Furthermore, in the oscillating sorting device 43, a sieving section 190 is provided on the rear side of the lower grain pan 112, with multiple sieving wire sections 191 arranged in parallel. With this configuration, the sieving section 190 acts on the material leaking from the chaff sieve 120 and the material being sent from the lower grain pan 112 above the front of the grain sieve 130, and sieving sorting is performed in conjunction with the oscillating sorting device 43. This, combined with the angle adjustment of the grain sieve 130, which has a variable inclination angle, makes it possible to effectively improve sorting accuracy.

[0144] Furthermore, an opening 200 is provided in the side plate portion 139L of the sorting section 8. With this configuration, by opening the exterior cover on the left side of the traveling body 2 and removing the lid cover 210, the condition of the grain sieve 130 can be checked through the opening 200. In other words, the opening 200 can be used as an inspection window for the grain sieve 130, and the angle state of the grain sieve 130 can be checked through the opening 200. In addition, by making all or part of the lid cover 210 that closes the opening 200 from a transparent plate, it becomes possible to visually check the condition of the grain sieve 130 while the lid cover 210 is attached.

[0145] Furthermore, the installation and removal of the grain sieve 130, as well as maintenance work, can be performed through the opening 200 without removing the oscillating sorting device 43 from the machine body. This improves the workability of maintenance work on the grain sieve 130, allowing the sorting and conveying performance of the processed materials by the grain sieve 130 to be maintained with simple operations. The oscillating sorting device 43 is provided to be removable from and installed on the traveling machine body 2 through an opening 202 that is normally covered by a rear cover 201 that covers the lower part of the rear of the traveling machine body 2 (see Figure 5).

[0146] (Modified version of the oscillating sorting device) A modified configuration of the oscillating sorting device 43 according to this embodiment will be explained with reference to Figure 14.

[0147] As described above, the oscillating sorting device 43 has a chaff sieve 120 provided above the grain sieve 130 for sorting the threshed material. The chaff sieve 120 includes a plurality of chaff fins 121 that are provided to allow adjustment of the inclination angle, and is configured to adjust the amount of threshed material that leaks out by adjusting the inclination angle (chaff angle) of the plurality of chaff fins 121. In this modified configuration, the grain sieve 130, which is provided to be rotatable around the support shaft 138, is provided to rotate in conjunction with the change in the chaff angle.

[0148] As shown in Figure 14, the chaff operating arm 151 for adjusting the chaff angle and the grain sieve 130 are connected to each other by a connecting arm 220. The connecting arm 220 is made of a longitudinal plate-like member with a linear shape and its left-right direction being the thickness direction, and is provided on the left side of the left side plate 141L.

[0149] The connecting arm 220 is connected to the tip of the front arm portion 151a of the chaff operating arm 151 by an arm pivot support 221 at one end (upper side) in the longitudinal direction. The arm pivot support 221 pivotally supports the connecting arm 220 and the front arm portion 151a so that they can rotate relative to each other by a support shaft 222 whose axis is oriented in the left-right direction. The support shaft 222 is provided coaxially with the second arm support shaft 154 (see Figure 10). Note that the shaft member forming the support shaft 222 may be the same as the shaft member forming the second arm support shaft 154.

[0150] The connecting arm 220 connects its other (lower) end in the longitudinal direction to the front end of the grain sheave 130 via a grain sheave support shaft 204. The connecting arm 220 supports the grain sheave 130 so that it can rotate with the left-right direction as the axis of rotation.

[0151] The grain sheave support shaft 204 has a shaft body portion 204a, which is the connecting portion to the grain sheave 130, and flange portions 204b, which are provided on the left and right outer sides (left side) of the shaft body portion 204a and are enlarged portions relative to the shaft body portion 204a. The grain sheave support shaft 204 has the shaft body portion 204a as the penetrating portion for the connecting arm 220, and the flange portions 204b are positioned on the left and right outer sides of the connecting arm 220.

[0152] With the above configuration, as shown in Figure 14, when the chaff handling arm 151 rotates around the first arm support shaft 153 (see arrows G1 and G2), the grain sieve 130 rotates around the support shaft 138 via the connecting arm 220 (see arrows H1 and H2), and the grain sieve angle changes.

[0153] As shown in Figure 14, in a left side view, when the chaff dispensing arm 151 rotates counterclockwise (see arrow G1), the chaff fin 121 rotates to the upright position, and the grain sieve 130 rotates around the support shaft 138 in a direction that lowers its front end, that is, in a direction that increases the grain sieve angle (see arrow H1). Conversely, in a left side view, when the chaff dispensing arm 151 rotates clockwise (see arrow G2), the chaff fin 121 rotates to the downed position, and the grain sieve 130 rotates around the support shaft 138 in a direction that raises its front end, that is, in a direction that decreases the grain sieve angle (see arrow H2).

[0154] In this way, the grain sieve 130 rotates in conjunction with the change in the chaff angle caused by the operation of the chaff operating arm 151, and the grain sieve angle changes. That is, the chaff operating arm 151 and the connecting arm 220 constitute an interlocking mechanism 230 that changes the grain sieve angle according to the chaff angle. Therefore, the grain sieve angle is automatically adjusted in conjunction with the adjustment of the chaff angle by selecting the screw hole portion 155 used to fix the chaff operating arm 151 as described above.

[0155] In this embodiment, the chaff angle can be adjusted in five steps by selecting the first to fifth screw holes 155A to 155E, which are used to fix the rotation of the chaff operating arm 151. Therefore, the grain sieve angle is adjusted in five steps according to the fixed position of the chaff operating arm 151.

[0156] As shown in Figure 11A, when the first screw hole 155A is used to fix the chaff dispensing arm 151, the chaff fin 121 is in its most reclined position, and accordingly, the grain sheave 130 is positioned with its tip at the upper end during rotational movement around the support shaft 138, that is, the grain sheave angle is at its minimum. Also, as shown in Figure 11B, when the fifth screw hole 155E is used to fix the chaff dispensing arm 151, the chaff fin 121 is in its most upright position, and accordingly, the grain sheave 130 is positioned with its tip at the lower end during rotational movement around the support shaft 138, that is, the grain sheave angle is at its maximum.

[0157] As described above, in a configuration in which the grain sieve 130 is provided so as to be rotatable around the support shaft 138, if the grain sieve 130 is rotated in conjunction with the change in the chaff angle of the chaff sieve 120, the grain sieve angle can be automatically adjusted in accordance with the change in the chaff angle due to the adjustment of the chaff angle.

[0158] For example, when the amount of material to be processed is relatively large, adjusting the chaff operating arm 151 to a fixed position using the fourth screw hole 155D or the fifth screw hole 155E increases the chaff angle, widening the spacing between the multiple chaff fins 121, and also increases the grain sieve angle, thereby increasing the amount of material to be leaked through the chaff sieve 120 and grain sieve 130, respectively. Conversely, when the amount of material to be processed is relatively small, adjusting the chaff operating arm 151 to a fixed position using the first screw hole 155A or the second screw hole 155B decreases the chaff angle, narrowing the spacing between the multiple chaff fins 121, and also decreases the grain sieve angle, thereby reducing the amount of material to be leaked through the chaff sieve 120 and grain sieve 130, respectively.

[0159] Thus, the interlocking mechanism 230 between the chaff sieve 120 and the grain sieve 130 makes it possible to simultaneously adjust both the chaff angle and the grain sieve angle according to the amount of material being processed and crop conditions, thereby improving sorting accuracy.

[0160] The embodiments described above are examples of the present invention, and the present invention is not limited to the embodiments described above. Therefore, even in embodiments other than those described above, various modifications are possible depending on the design, etc., as long as they do not depart from the technical spirit of the present invention. Furthermore, the effects described in this disclosure are merely examples and are not limiting, and other effects may also exist.

[0161] In the embodiment described above, combine harvester 1 is a conventional combine harvester, but the present invention is also applicable to other combine harvesters, such as a self-propelled combine harvester.

[0162] In the embodiments described above, a configuration is employed in which the grain sheave 130 is rotated using the wire 171, or in which the grain sheave 130 is rotated in conjunction with a change in the chaff angle of the chaff sheave 120. However, the following configurations can be adopted for adjusting the chaff angle and the grain sheave angle.

[0163] In other words, as shown in Figure 5, the sorting unit 8 is equipped with a grain stalk detection means 300 for detecting grain stalks, and the chaff angle and grain sieve angle are controlled based on the detection results from the grain stalk detection means 300. In the example shown in Figure 5, the grain stalk detection means 300 is located near the dust discharge port 8a at the rear of the sorting unit 8. The grain stalk detection means 300 includes a detection body 301 that rotates in response to the action of, for example, the discharged straw from the handling chamber 7b to the dust discharge port 8a, and a detection switch 302 that switches on and off in accordance with the rotation of the detection body 301.

[0164] The detection body 301 is a substantially rectangular plate-shaped member, with its upper edge supported by a support shaft 303 whose axis is oriented in the front-rear direction, and is provided to be rotatable left and right around the axis of the support shaft 303. The support shaft 303 is installed between the rear wall portion 7d of the threshing unit 7 and a predetermined support member provided in front of it. The detection body 301 is provided with a switch operating piece that acts on the detection switch 302 to turn on the detection switch 302 when the amount of rotation of the detection body 301 exceeds a predetermined amount, and an elastic body such as a spring that biases the detection body 301 to hold it in a predetermined detection reference position (neither of which are shown). The detection switch 302 is electrically connected to a control unit 310 of the combine harvester 1, and the signal from the detection switch 302 is input to the control unit 310.

[0165] In this configuration, if the amount of straw discharged to the dust outlet 8a exceeds a certain amount, the detection body 301 rotates against the biasing force of the elastic body, causing the detection switch 302 to turn on due to the action of the switch operating piece, and the control unit 310 recognizes the ON signal. In this case, it can be said that the flow rate of the processed material is relatively high, so the control unit 310 automatically adjusts the chaff angle and grain sieve angle to be larger. As a result, the amount of processed material leaking out of the chaff sieve 120 and grain sieve 130 increases.

[0166] On the other hand, if the amount of straw discharged to the dust outlet 8a is a certain amount or less, the detection body 301 is moved to the detection reference position by the biasing force of the elastic body, the switch operating piece does not act on the detection switch 302, and the detection switch 302 is turned off, and the control unit 310 recognizes the off signal (non-detection of the on signal). In this case, it can be said that the flow rate of the processed material is relatively low, so the control unit 310 automatically adjusts the chaff angle and grain sieve angle to be smaller. As a result, the amount of processed material leaking out of the chaff sieve 120 and grain sieve 130 is reduced.

[0167] In adjusting the chaff angle and grain sieve angle using the grain stalk detection means 300, the set values ​​for the chaff angle and grain sieve angle corresponding to the ON and OFF signals of the detection switch 302 are pre-set and stored in the control unit 310. In this configuration, the chaff angle and grain sieve angle are adjusted in two stages according to the ON / OFF state of the detection switch 302. For example, by using a potentiometer as the grain stalk detection means 300, it is possible to set three or more detection ranges for the amount of straw discharged to the dust outlet 8a and control the chaff angle and grain sieve angle to adjust them in three or more set angles according to each detection range, or to control the chaff angle and grain sieve angle to adjust them steplessly according to the amount of straw discharged.

[0168] Furthermore, regarding the configuration in which the grain sheave 130 is rotated using the wire 171 as described above (see Figure 9), the following configuration can be adopted in a self-propelled combine harvester.

[0169] In a self-propelled combine harvester, the threshing unit has a threshing drum with the front-to-back direction as the axis of rotation, and a stalk supply device located to the left of the threshing drum. The stalk supply device grips the base of the stalks cut by the harvesting unit and transports the stalks backward in a horizontal position with the ears facing the threshing drum. The stalk supply device consists of a feed chain wound around a plurality of sprockets with the left-to-right direction as the axis of rotation, and a stalk supply clamping body (clamping guide) that works in cooperation with the feed chain to grip the base of the stalks.

[0170] The gripping guide is provided to be movable in the gripping direction (up and down) of the grain stalk, and its vertical position in the gripping state is changed depending on the amount of grain stalk being gripped (thickness of the straw layer). In such a gripping guide, there is a configuration in which the gripping guide and the arm that rotates the chaff fin of the chaff sieve are linked to each other by a wire, and the chaff angle is adjusted according to the amount of grain stalk being gripped and transported.

[0171] In this configuration, one end of a wire that rotates the grain sieve (for example, the other end of wire 171 shown in Figure 9) is connected to a wire or wire operating part that interlocks the gripping guide and the chaff sieve, so that the grain sieve rotates in conjunction with the gripping guide and the chaff sieve. With this configuration, it becomes possible to automatically adjust the tilt of the grain sieve along with the chaff angle according to the amount of grain being conveyed in the grain stalk feeding device, thereby improving sorting accuracy.

[0172] This technology can take the following configurations. Note that the configurations described below can be selected and combined as desired.

[0173] (1) A combine harvester comprising: a threshing unit for threshing crops; an oscillating sorting device for sorting the threshed material from the threshing unit; and a winnowing machine for blowing sorting air to the oscillating sorting device, The aforementioned oscillating sorting device has a grain sieve for sorting threshed material, The grain sieve is rotatably mounted so as to move the upwind side of the sorting air up and down, with the downwind side of the sorting air as the pivot point. A combine harvester characterized by the following features. (2) The aforementioned oscillating sorting device has a chaff sieve provided above the grain sieve for sorting the threshed material, The chaff sieve includes a plurality of fins that are provided to allow adjustment of the inclination angle, and is configured to adjust the amount of threshed material that leaks out by adjusting the inclination angle of the plurality of fins. The aforementioned glen sheave is provided to rotate in conjunction with the change in the inclination angle of the plurality of fins. The combine harvester according to (1) above, characterized in that it is a combination harvester. (3) The oscillating sorting device has a grain pan provided in front of the grain sieve to receive the threshed material that leaks out from the chaff sieve. The rear side of the aforementioned grain pan is provided with a sieve section in which multiple sieve wires are arranged in parallel. The combine harvester according to (1) or (2) above, characterized in that it is the same as described above. (4) The aforementioned oscillating sorting device is installed between the left and right side plates, Of the left and right side plates, the left and right outer side plates are provided with openings that, in a side view, include at least a portion of the grain sieve within their opening range. A combine harvester according to any one of the above items (1) to (3), characterized in that it is a combine harvester. [Explanation of Symbols]

[0174] 1 combine harvester 7. Threshing section 43. Oscillating sorting device 47 Karawinoo 112 Lower Glenpan (Glenpan) 120 Chaff Sieve 121 Chaff fins (fins) 130 Glen Seeve 138 Support shaft 139 Side plate part 139L Side panel section (left and right outer side panels) 151 Chaff dispensing arm 181 Operating Arm 190 Phloem 191 Sieve section 200 opening 210 Lid cover 230 Interlocking mechanism

Claims

1. A combine harvester comprising a threshing unit for threshing crops, an oscillating sorting device for sorting the threshed material from the threshing unit, and a winnowing machine for blowing sorting air to the oscillating sorting device, The aforementioned oscillating sorting device has a grain sieve for sorting threshed material, The grain sieve is rotatably mounted so as to move the upwind side of the sorting air up and down, with the downwind side of the sorting air as the pivot point. A combine harvester characterized by the following features.

2. The aforementioned oscillating sorting device has a chaff sieve provided above the grain sieve for sorting the threshed material, The chaff sieve includes a plurality of fins that are provided to allow adjustment of the inclination angle, and is configured to adjust the amount of threshed material that leaks out by adjusting the inclination angle of the plurality of fins. The aforementioned glen sheave is provided to rotate in conjunction with the change in the inclination angle of the plurality of fins. The combine harvester as described in feature 1.

3. The oscillating sorting device has a grain pan provided in front of the grain sieve to receive the threshed material that leaks out from the chaff sieve. The rear side of the aforementioned grain pan is provided with a sieve section in which multiple sieve wires are arranged in parallel. A combine harvester according to claim 1 or 2.

4. The aforementioned oscillating sorting device is installed between the left and right side plates, Of the left and right side plates, the left and right outer side plates are provided with openings that, in a side view, include at least a portion of the grain sieve within their opening range. The combine harvester as described in feature 1.

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