Combine harvester

Abstract

The present application provides a combine harvester capable of easily and efficiently performing cleaning and maintenance work of a receiving net. The combine harvester has a thresher (4) having a threshing section (30) that feeds a whole of harvested crop stalks into a threshing chamber (31) and performs a threshing process using a freely rotating driven threshing cylinder, and a screening section (40) that performs a screening process on the threshing process product from the above-described threshing chamber (31) by a freely swinging screening device (42), wherein a pivot support mechanism (81) that supports an upper lateral side wall section forming the above-described threshing chamber (31) of the above-described thresher (4) in a freely swingable opening and closing manner, and a detachable support mechanism (80) that supports the above-described upper lateral side wall section in a freely detachable manner are provided.

Description

[0001] This application is a divisional application of the original application (application date: July 30, 2008, application number: 200810131191.X, invention title: combine harvester) and its divisional application (application date: July 30, 2008, application number: 202110754886.9, invention title: combine harvester). Technical Field

[0002] The present invention relates to a combine harvester having a threshing unit equipped with a threshing section for threshing harvested straw by feeding the whole harvested straw into the threshing chamber and threshing it using a threshing drum driven by free rotation, and a screening section for screening the threshed material from the threshing chamber by a screening device that swings freely. Background Technology

[0003] Among the aforementioned combine harvesters, those with an open threshing chamber have historically included, for example, Japanese Patent Application Publication No. 6-253657 (paragraph 0010). Figure 3 , 4 The harvester described in (hereinafter referred to as "Patent Document 1").

[0004] In the combine harvester described in Patent Document 1, the top plate of the threshing chamber is installed so that it can be freely opened and closed around the axis in the front-back direction.

[0005] Although the threshing chamber can be opened by adopting the above-mentioned existing technology, there are problems with the cleaning and maintenance of the receiving net.

[0006] In other words, even when the threshing chamber is opened using existing technology, although the threshing chamber can be opened to allow hands or cleaning tools to enter the threshing drum, the hands or cleaning tools cannot reach the receiving screen. Therefore, in order to clean and maintain the receiving screen, it is necessary to pull the receiving screen out of the opening of the threshing chamber. Summary of the Invention

[0007] The purpose of this invention is to provide a combine harvester that can easily and efficiently perform cleaning and maintenance of the receiving net.

[0008] The present invention is characterized in that the combine harvester has a threshing machine, which has a threshing section for feeding the harvested straw into the threshing chamber and threshing it using a threshing drum driven by free rotation, and a screening section for screening the threshed material from the threshing chamber by a freely swinging screening device. The threshing machine has a pivot support mechanism that supports the upper transverse sidewall of the threshing chamber in a freely swinging opening and closing manner, and a loading and unloading mechanism that supports the upper transverse sidewall in a freely loading and unloading manner.

[0009] According to this structure, by swinging open the upper transverse sidewall or removing it, the transverse side of the threshing chamber can be opened with the receiving mesh facing the opening, thereby enabling cleaning and maintenance while the receiving mesh is still installed in the threshing chamber.

[0010] In addition, depending on the scale of cleaning and maintenance and the condition of tools, sometimes it is sufficient to swing the upper transverse sidewall open without removing it, while at other times the upper transverse sidewall can be removed to prevent it from becoming an obstruction, making the operation easier.

[0011] Therefore, cleaning and maintenance of the receiving screen can be carried out easily and efficiently without removing it from the threshing chamber. Additionally, depending on the specific circumstances, the upper transverse sidewall can be removed to prevent it from becoming an obstruction, which also allows for efficient operation.

[0012] In the above structure, it is preferable to provide a grain sieve loading and unloading window for placing and taking out the grain sieve of the screening device on the lower transverse side wall of the screening section that forms the thresher.

[0013] According to this structure, the grain sieve can be removed and placed in through the grain sieve loading and unloading window for replacement.

[0014] Therefore, when the type of grain being harvested changes, the grain sieve can be easily replaced with a grain sieve with a different mesh size without having to remove the entire oscillating screening device from the screening section, thus enabling proper screening.

[0015] In the above structure, it is preferable to have a pivot support mechanism that supports the top plate of the threshing chamber forming the threshing machine in a manner that allows it to swing open and close freely.

[0016] According to this structure, by swinging the top plate, the upper part of the threshing chamber can be opened to remove the receiving net from the threshing chamber.

[0017] Therefore, when the type of grain being harvested changes, the receiving net can be replaced with a receiving net with a different mesh size, thus enabling appropriate threshing.

[0018] In the above structure, it is preferable to have dust feeding valves and a reinforcing plate. The dust feeding valves are arranged and connected to the inner surface of the top plate of the threshing chamber forming the threshing machine along the rotation axis of the threshing drum. The reinforcing plate is connected to the outer surface of the top plate in a manner that is fastened together with the plurality of dust feeding valves.

[0019] Based on this structure, reinforcing plates can be used to increase the support strength, so that the top plate can be used to firmly support the dust valve.

[0020] Therefore, even with large reaction forces from the threshed material acting on the dust valve, the top plate can firmly support the dust valve, enabling precise flow guidance of the threshed material. Moreover, this can be achieved with a simple structure such as a reinforcing plate, making it cheaper than using thick plates to construct the top plate.

[0021] Furthermore, in the above structure, it is preferable that a rotary drum for rakes upright straw into the harvesting device is provided in the harvesting section, and that the bending strength of the end teeth located on the transverse end side of the rotary drum is set to be greater than the bending strength of the inner teeth located on the inner side of the rotary drum among the teeth arranged along the rotation axis of the rotary drum.

[0022] Previously, there were structures where all the teeth arranged along the axis of rotation of the rotating drum had the same bending strength. However, in combine harvesters that used technologies associated with conventional rotating drums, insufficient threshing or harrowing occurred.

[0023] In other words, sometimes upright rice stalks from unharvested land become entangled and enter the harvester along with the target rice stalks on the transverse side of the rotating drum. If the bending strength of the end teeth on this transverse side is low, they will deform due to the strong reaction force from the rice stalks, resulting in poor raking of the rice. Therefore, to prevent this problem, the bending strength of the end teeth must be increased to ensure powerful raking. This also increases the bending strength of the inner teeth on the inner side of the rotating drum. However, the inner teeth act on the target rice stalks that are not entangled with unharvested land and do not experience the same reaction force as the end teeth. Nevertheless, they still apply a strong raking action to the rice without causing deflection due to the reaction force. As a result, depending on the type of rice, threshing problems can easily occur on the inner side of the rotating drum.

[0024] Therefore, by adopting this structure, the end teeth on the transverse end of the rotating drum that harrow the upright straw have greater bending strength than the inner teeth, so that even if the reaction force from the straw is large, it is difficult to deform and a strong harrowing action can be performed.

[0025] On the other hand, the inner teeth that harrow the upright straw on the inside of the rotating drum have a smaller bending strength than the end teeth, so that they can bend easily and gently harrow the straw when subjected to a large reaction force from the straw.

[0026] Therefore, the stalks can be raked into the harvesting device by a rotating drum under good conditions where it is difficult for insufficient raking or threshing to occur. This allows for smooth stalk flow and efficient operation, while also preventing grain loss.

[0027] In the above structure, preferably, the inner teeth are formed such that the end side of the inner teeth is closer to the outer periphery of the rotating drum than the end side of the end teeth.

[0028] According to this structure, even if the inner teeth are grounded due to the lowering of the rotating drum to operate as close to the ground as possible, the end teeth can be easily prevented from grounding because the end of the inner teeth is closer to the outer periphery of the rotating drum than the end of the end teeth. The inner teeth have lower bending strength than the end teeth, making them more prone to elastic deformation due to grounding and less susceptible to deformation or breakage.

[0029] Therefore, it is possible to obtain a combine harvester with excellent durability that is less prone to deformation or damage due to grounding of the inner or end teeth, even if the rotating drum descends excessively and grounds.

[0030] In the above structure, it is preferable to set the extension length of the end-side tooth extending from the tooth support portion to be shorter than the extension length of the inner tooth extending from the tooth support portion.

[0031] According to this structure, even if the rotating drum is lowered to operate as close to the ground as possible, causing the inner teeth to ground, the end teeth are less likely to ground because their extension length from the tooth support is shorter than that of the inner teeth. The inner teeth also have lower bending strength than the end teeth, making them more susceptible to elastic deformation due to grounding and less prone to deformation or breakage.

[0032] Therefore, it is possible to obtain a combine harvester with excellent durability that is less prone to deformation or damage due to grounding of the inner or end teeth, even if the rotating drum descends excessively and grounds.

[0033] In the above structure, preferably, in a pair of adjacent tooth support portions in the rotation direction of the rotating drum, an inner tooth set having multiple inner teeth supported by one tooth support portion and an inner tooth set having multiple inner teeth supported by the other tooth support portion are arranged at staggered positions in the rotation axis direction of the rotating drum.

[0034] According to this structure, the installation interval of the inner teeth on each tooth support can be set to be large, reducing the number of inner teeth on the rotating drum. Therefore, in terms of the number of inner teeth, it can be obtained cheaply. At the same time, the rotating drum can be used to rake the straw with high precision.

[0035] In other words, the inner teeth on one tooth support are arranged circumferentially around the rotating drum, as are the inner teeth on another tooth support. This allows for a larger spacing between the inner teeth on each tooth support and a reduction in the number of inner teeth on each tooth support. Consequently, even if there are upright stalks located on tooth supports below the rotating drum that are not stopped by the inner teeth on those tooth supports, the inner teeth of the next arriving tooth support can stop the upright stalks and rake them into the harvesting device. Attached Figure Description

[0036] Figure 1 This is a left-side view of the combine harvester as a whole;

[0037] Figure 2 This is a right-side view of the combine harvester as a whole;

[0038] Figure 3 This is a top view of the combine harvester as a whole;

[0039] Figure 4 This is a longitudinal sectional side view of a threshing machine;

[0040] Figure 5 This is a cross-sectional front view of the threshing machine;

[0041] Figure 6 This is a longitudinal sectional rear view of the secondary recycling device;

[0042] Figure 7 This is a side view of the secondary recycling unit;

[0043] Figure 8 It is a three-dimensional view of the upper transverse sidewall in its open state;

[0044] Figure 9 (A) is a top view with the upper transverse sidewall closed. Figure 9 (B) is a top view of the upper transverse sidewall in its swing-open state;

[0045] Figure 10 This is a side view of the loading / unloading mechanism and the pivot mechanism;

[0046] Figure 11 This is a rear view of the loading / unloading mechanism and the pivot mechanism;

[0047] Figure 12 This is a top view of the locking mechanism;

[0048] Figure 13 This is the main view of the locking mechanism;

[0049] Figure 14 This is a side view of the grain sieve loading and unloading window assembly on the outer transverse sidewall;

[0050] Figure 15 This is a top view of the top plate;

[0051] Figure 16 This is a sectional view of the reinforcing plate assembly of the top plate;

[0052] Figure 17 This is a left-side view of the combine harvester as described in the second embodiment;

[0053] Figure 18 This is a right-side view of the combine harvester as described in the second embodiment;

[0054] Figure 19 This is a top view of the combine harvester as described in the second embodiment;

[0055] Figure 20 This is a side view of the rotating drum assembly of the harvesting section;

[0056] Figure 21 This is a side view of the rotating drum;

[0057] Figure 22 This is a top view of the rotating drum;

[0058] Figure 23 This is a front view of one side of the rotating drum;

[0059] Figure 24 This is the front view of the other side of the rotating drum;

[0060] Figure 25 This is a side view of the rotating drum in its lower position during the descent operation.

[0061] Figure 26 This is a side view of the rotating drum in its descent operation from its high position side;

[0062] Figure 27 This is a side view of the rotating drum in its lower position during the descent operation.

[0063] Figure 28 This is a side view of the tooth support.

[0064] Figure 29 This is a top view of a part of the screw feeder;

[0065] Figure 30 This is a side view of the seat support structure;

[0066] Figure 31 This is a top view of the seat support structure;

[0067] Figure 32 This is the front view of the seat support structure;

[0068] Figure 33This is a side view of the toothed support portion of the rotating drum having the second embodiment structure. Detailed Implementation

[0069] [First Implementation Method]

[0070] The first embodiment of the present invention will now be described with reference to the accompanying drawings.

[0071] Figure 1 This is a left-side view of the combine harvester according to the first embodiment of the present invention. Figure 2 This is a right-side view of the combine harvester as described in an embodiment of the present invention. Figure 3 This is a top view of the combine harvester according to an embodiment of the present invention. As shown in these figures, the combine harvester according to an embodiment of the present invention includes: a traveling body that is self-propelled by a pair of tracked traveling devices 1, 1 on the left and right sides, and has a driver's section 2 with a driver's seat 2a installed thereon; a threshing machine 4 installed on the rear side of the body frame 3 of the traveling body; a grain bagging section 10 equipped with a bagging box 11 provided on the lateral side of the threshing machine 4; and a harvesting section 20 connected to the front of the threshing machine 4 with a feeding device 21.

[0072] The combine harvester harvests rice, wheat, and other crops.

[0073] In other words, in addition to the aforementioned feeding device 21, the harvesting unit 20 also includes: a harvester frame 22 connected to the front end of the feeding device 21; dividers 23 disposed on both sides of the front end of the harvester frame 22; a pusher-shaped harvesting device 24 disposed on the front end of the frame portion 22a of the harvester frame 22 and freely drivable; a screw feeder 25 disposed on the upper surface of the frame portion 22a and freely rotatable on the harvester frame 22; and a rotating drum 27, which is freely rotatable and drivable supported on a pair of left and right support arms 26, 26, which extend forward from the upper part of the base end side of the harvester frame 22.

[0074] The aforementioned feeding device 21, under the action of the hydraulic cylinder 28, is oscillating up and down relative to the thresher 4 around the lifting axis P which faces laterally towards the machine body. This allows the harvesting unit 20 to move in a lowering operation state, where the platform portion 22a of the harvester frame 22 is lowered to near the ground, and in a rising, non-operational state, where the harvester frame 22 is significantly raised from the ground. When the machine body is traveling in the lowering operation state, the harvesting unit 20 performs the harvesting of upright straw and the supply of harvested straw to the thresher 4.

[0075] In other words, a pair of dividers 23, 23 on the left and right sides separate the upright stalks into harvestable and non-harvestable types. Then, while the upright stalks to be harvested are raken together by the rotating drum 27 and harvested by the harvesting device 24, the harvesting device 24 is used for harvesting. The harvested stalks are laterally conveyed along the frame section 22a to the front of the feeding device 21 by the spiral plates 25a located at both ends of the spiral feeder 25. The harvested stalks that have reached the front of the feeding device 21 are fed into the inlet of the feeding device 21 located at the rear of the spiral feeder 25 by the gathering and conveying arm 25b, which is integrally rotatable and set in the middle of the spiral feeder 25. Then, the harvested stalks fed into the feeding device 21 are conveyed to the rear by the conveyor 29 located inside the feeding device 21. Using the conveyor 29, the harvested straw, from root to tip, is fed into the threshing chamber 31 of the threshing machine 4 (see reference 29) at the rear end of the feeding device 21. Figure 4 The front end of ).

[0076] Figure 4 This is a longitudinal sectional side view of the thresher 4 mentioned above. Figure 5 This is a cross-sectional front view of the threshing machine described above. As shown in these figures, the threshing machine 4 described above has: a threshing section 30 having the threshing chamber 31 described above, and a screening section 40 having a screening chamber 41 located below the threshing chamber 30.

[0077] In addition to the threshing chamber 31, the threshing section 30 also includes: a threshing drum 32 that is rotatably driven to rotate around a threshing drum rotation axis 32a facing the front and rear of the machine body; a receiving mesh 33 arranged around the lower side of the threshing drum 32 in the threshing chamber 31; and a plurality of dust valves 35 arranged on the inner surface of the top plate 34 of the threshing chamber 31 in the direction along the threshing drum rotation axis 32a.

[0078] The threshing section 30 performs threshing as follows.

[0079] In other words, the harvested rice straw, fed into the front end of the threshing chamber 31, is fed into the threshing section of the threshing drum 32 by a spiral-shaped rake tooth 32b that is rotatably integrated at the front end of the threshing drum 32. The harvested rice straw fed into this threshing section is threshed using the aforementioned cylindrical threshing teeth 32c arranged circumferentially and longitudinally along the threshing drum 32 and the aforementioned receiving net 33. At this time, under the conveying action of the rotating threshing drum 32 and the flow guidance action of each dust valve 35, the straw fragments and other debris flow towards the rear of the threshing chamber 31. The threshed grains fall through the receiving net 33 into the screening device 42 of the screening section 40, while the straw fragments and other dust are discharged from the dust inlet 36 located at the rear end of the threshing chamber 31.

[0080] In addition to the screening chamber 41 and the screening device 42, the screening unit 40 also has a windmill 43 located below the front end of the screening device 42; a primary spiral conveyor 44 and a secondary spiral conveyor 45 located at the bottom of the screening chamber 41.

[0081] The screening device 42 described above includes: a sieve box 50 that is linked to a screening drive mechanism 46 located at the rear end of the screening chamber 41; an upper grain tray 51, a chaff sieve 52, and a stalk remover 53 arranged in the front-to-back direction of the inner upper part of the sieve box 50; and a lower grain tray 54 and a grain sieve 55 arranged in the front-to-back direction of the sieve box at the bottom of the sieve box 50.

[0082] The screening device 42 described above has a screening adjustment plate 56 that is detachably mounted on the front end of the chaff screen 52. This screening adjustment plate 56 is used when there is a lot of dust, such as straw, mixed in with the threshed material falling from the receiving net 33 onto the upper grain tray 51, by closing the material drop hole of the chaff screen 52 below the screening line 57 extending from the rear end of the upper grain tray 51.

[0083] The screening unit 40 uses the screening drive mechanism 46 to swing and drive the screening device 42, and uses the fan 43 to supply screening air along the front and back direction of the thresher in a manner that passes through the husk screen 52, the stalk separator 53 and the grain screen 55, thereby performing screening processing of the threshed material.

[0084] In other words, the threshed material falling from the receiving net 33 is received by the screening device 42, and the oscillating screening performed by the upper grain tray 51, chaff screen 52, stalk separator 53, lower grain tray 54, and grain screen 55, as well as the air screening performed by the screening air, separates single grains as primary processed material, mixed material such as stalked grains and straw as secondary processed material, and dust such as straw as tertiary processed material. The primary processed material falls onto the primary screw conveyor 44, which transports it to the lateral outer side of the threshing machine body. The secondary processed material falls onto the secondary screw conveyor 45, which transports it to the lateral outer side of the threshing machine body. The screening air uses the tertiary processed material, along with the threshed material from the dust inlet 36 of the threshing chamber 31, to the rear outer side of the threshing machine body through the dust outlet 47 located at the rear of the threshing machine body.

[0085] The aforementioned dust discharge port 47 has a dust discharge hood 48 that guides the discharged dust downwards so that it does not spread to the rear of the threshing machine.

[0086] like Figure 2As shown, the grain bagging section 10, in addition to the bagging box 11, also has a bag support section. This bag support section supports the upper end of the grain bag mounted on the discharge cylinder 12 using a bag support rod 13, and supports the lower end of the grain bag using a bag receiving platform 14. The discharge cylinder 12 is located at the lower part of the bagging box 11.

[0087] Bag box 11 utilizes winnowing device 15 (see reference) Figure 3 The dehulled grains are supplied from the first-stage screw conveyor 44 and stored thereon, and the stored dehulled grains are discharged from the discharge cylinder 12 into the grain bag.

[0088] like Figure 3 As shown, the thresher 4 has a secondary material return device 60 located on the lateral outer side of the thresher body. Figure 6 This is a longitudinal sectional rear view of the aforementioned secondary material return device 60. Figure 7 This is a side view of the aforementioned secondary recycling device 60. As shown in these figures, the secondary recycling device 60 includes: a processing box 62 connected to an inlet 61 at the conveying end of the aforementioned secondary screw conveyor 45; two processing blades 63 disposed inside the processing box 62 and integrally and rotatably connected to the screw shaft of the secondary screw conveyor 45; a winnowing cylinder 64 whose lower end is connected to the outlet of the aforementioned processing box 62; a winnowing screw 65 disposed rotatably inside the winnowing cylinder 64; and a transmission box 66 disposed across the lateral side of the aforementioned processing box 62 and the lower end of the aforementioned winnowing cylinder 64.

[0089] The secondary return device 60 uses a secondary screw conveyor 45 to rotate and drive the processing blades 63. The drive force of the secondary screw conveyor 45 is transmitted to the lower end of the winnowing screw 65 by the transmission chain 67 housed in the transmission box 66, and the winnowing screw 65 is driven. After the secondary processed material from the screening section 40 is processed into individual particles, it is re-screened in the screening device 42.

[0090] In other words, the conveying force of the secondary screw conveyor 45 is used to guide the processed material from the secondary screw conveyor 45 into the processing box 62. The impact action of the processing blades 63 processes the stalked and branched grains mixed in with the secondary processed material that has entered the processing box 62, making them into individual grains. The processed grains and stalks are then fed into the winnowing drum 64 by the rotating processing blades 63. The processed material entering the winnowing drum 64 is lifted to the upper end of the winnowing drum 64 by the winnowing screw 65. The throwing action of the rotating blades 68, which are integrally and freely rotatably attached to the screw shaft of the winnowing screw 65, propels the processed material reaching the upper end of the winnowing drum 64 into the return port 69 located on the transverse side wall of the threshing machine 4. From the return port 69, the material falls through the transverse side wall of the threshing chamber 31 and the threshing drum 32 into the screening chamber 41, thereby being supplied to the front end of the screening device 42.

[0091] The aforementioned processing box 62 has: a box body 62a bolted to a transverse side wall 70 (hereinafter referred to as the inner transverse side wall 70) located on the transverse inner side of the traveling body of the threshing machine 4; and a side plate 62c connected to the opposite side of the aforementioned inlet 61 of the box body 62a by means of connecting bolts 62b in a manner that allows for free loading and unloading.

[0092] In other words, by removing the side plate 62c to open the interior of the processing box 62, maintenance and cleaning of the interior of the processing box can be carried out even when the box body 62a is still connected to the aforementioned inner transverse side wall 70. The transmission box 66 is connected to the screw shaft of the secondary screw conveyor 45 and the input shaft 65a of the winnowing screw 65 in a freely detachable manner, allowing the transmission box 66 to be installed and removed together with the side plate 62c while it is mounted on the side plate 62c.

[0093] like Figure 1 As shown, the threshing machine 4 described above has a transverse sidewall 71 located on the transverse outer side of its traveling body (see reference). Figure 5 The outer surface of the outer sidewall 71 includes the upper front cover 72, upper rear cover 73, lower front cover 74, and lower rear cover 75.

[0094] The aforementioned upper front cover 72, lower front cover 74, and lower rear cover 75 cover the belt drive mechanism 76 (see reference) which is disposed on the outer surface of the aforementioned outer transverse sidewall 71. Figure 14 The aforementioned belt drive mechanism 76 will supply power from the engine 5 located below the driver's seat 2a (see reference). Figure 2 The driving force of the threshing drum 32, the windmill 43, the primary spiral conveyor 44, the secondary spiral conveyor 45 and the screening drive mechanism 46 are transmitted to the threshing drum 32, the windmill 43, the primary spiral conveyor 44, the secondary spiral conveyor 45 and the screening drive mechanism 46.

[0095] The aforementioned upper front cover 72, lower front cover 74, and lower rear cover 75 are supported on the outer transverse sidewall 71 by a loading and unloading mechanism (not shown) provided across each cover 72, 74, 75 and the outer transverse sidewall 71. The loading and unloading mechanism of each cover 72, 74, 75 is constructed using hooks (not shown). By swinging the hooks to the detachment side using the operating member 77 provided on the cover 72, 74, 75, the connection between the cover 72, 74, 75 and the outer transverse sidewall 71 is released.

[0096] Each cover 72, 74, and 75 can also be freely attached and detached using connecting bolts.

[0097] like Figure 8 As shown, the upper transverse sidewall 71 forming the threshing chamber 31 and the lower transverse sidewall 71b forming the screening section 40 of the threshing machine 4 are formed separately, with the upper transverse sidewall 71a supported on the inner surface of the upper rear cover 73. A loading / unloading mechanism 80 and a pivoting mechanism 81 are provided across the rear end of the upper rear cover 73 and the machine frame 78 of the threshing machine 4.

[0098] Figure 10 This is a side view of the aforementioned loading and unloading mechanism 80 and the aforementioned pivot mechanism 81. Figure 11 These are rear views of the aforementioned loading / unloading mechanism 80 and the aforementioned pivot support mechanism 81. As shown in these figures, the aforementioned loading / unloading mechanism 80 and the aforementioned pivot support mechanism 81 have: a pair of upper and lower pivot shafts 83, 83 for attaching a pair of upper and lower supports 82, 82 to the aforementioned machine frame 78; and a pair of upper and lower connecting holes 85, 85 for connecting a pair of upper and lower connecting plates 84, 84 to the inner surface of the upper rear cover 73.

[0099] Using the aforementioned pair of upper and lower connecting holes 85, the aforementioned pair of upper and lower connecting plates 84, 84 are respectively externally embedded from above onto the aforementioned pair of upper and lower pivot shafts 83, 83. The aforementioned pair of upper and lower support bodies 82, 82 receive and support the connecting plates 84 from below using their upper surfaces. By setting this state, the loading and unloading mechanism 80 connects the upper rear cover 73 to the machine frame 78, thereby obtaining the aforementioned upper transverse sidewall portion 71a connected to the machine frame 78. The pivot mechanism 81 provides pivotal support, causing the aforementioned upper transverse sidewall portion 71a and the upper rear cover 73 to swing open and close together around the opening and closing axis X facing up and down toward the threshing machine body. This opening and closing axis X is the axis of the aforementioned pair of upper and lower pivot shafts 83, 83 and is located on the rear end side of the upper transverse sidewall portion 71a.

[0100] The loading and unloading mechanism 80 disconnects the upper rear cover 73 from the frame 78 by pulling the upper and lower pair of connecting plates 84, 84 from the pivot 83, thereby disconnecting the upper transverse side wall portion 71a from the frame 78.

[0101] Figure 9 Figure (A) is a top view of the upper transverse sidewall portion 71a in the closed state. As shown in the figure, the upper rear cover 73 is connected to the machine frame 78 by the loading and unloading mechanism 80, and is arranged in a closed state in the longitudinal direction of the machine body, in line with the upper front cover 72 in the installed state. In this way, the upper transverse sidewall portion 71a closes the transverse opening 86 of the threshing chamber located on the outer transverse sidewall 71. At this time, the upper rear cover 73 is fixed in the closed state by the locking mechanism 87 provided across the front end of the upper rear cover 73 and the outer transverse sidewall 71, thereby fixing the upper transverse sidewall portion 71a in the closed state.

[0102] Figure 12 This is a top view of the aforementioned locking mechanism 87. Figure 13 This is a front view of the locking mechanism 87 described above. As shown in these figures, the locking mechanism 87 includes: a locking rod 87a disposed on the outer surface of the outer transverse sidewall 71; a pair of hooks 87b, 87b that are disengaged from the locking rod 87a and disposed on the back side of the front end of the upper rear cover 73; and an operating member 88 disposed on the surface side of the upper rear cover 73 for swinging release operation of the pair of hooks 87b, 87b.

[0103] As an alternative to the locking mechanism 87, a structure in which the upper rear cover 73 is closed and fixed by connecting bolts can also be used to close and lock the upper transverse sidewall portion 71b.

[0104] Figure 8 The solid line represents the upper transverse sidewall portion 71a in the swing-open state. Figure 8 The double-dotted line indicates the upper transverse sidewall 71a, which is the upper transverse sidewall in the unloaded and open state. Figure 9 Figure (B) is a top view of the upper transverse sidewall portion 71a in its swing-open state. As shown in these figures, the upper rear cover 73, with the locking mechanism 87 switched to the unlocked state, swings open laterally outward about the opening / closing axis X. Thus, the upper transverse sidewall portion 71a and the upper rear cover 73 together swing outward about the machine body to achieve the swing-open state. Alternatively, by lifting the upper rear cover 73 relative to the support body 82, the upper and lower connecting plates 84, 84 are pulled out from the pivot axis 83, thereby disengaging the upper rear cover 73 from the machine frame 78 via the loading / unloading mechanism 80. Thus, the upper transverse sidewall portion 71a and the upper rear cover 73 together are removed from the machine frame 78 to achieve the unloaded open state. In either case, the transverse opening 86 of the threshing chamber can be opened, and maintenance and cleaning can be performed laterally outward from the threshing machine body while the receiving net 33 is still installed in the threshing chamber 31.

[0105] like Figure 9As shown in (B), with the upper transverse sidewall portion 71a open in a swing-open state, the other end of a locking rod 89, which is rotatably and vertically supported on the connecting plate 84 on the lower side, is installed in the locking rod hole 82a of the support body 82. In this way, the locking rod 89 presses against and supports the upper rear cover 73 when it is open, thereby fixing the upper transverse sidewall portion 71a in the open state.

[0106] like Figure 5 , Figure 14 As shown, the thresher 4 includes: a grain sieve loading / unloading window 90, which is disposed on the lower transverse sidewall portion 71b of the outer transverse sidewall 71 where the screening section 40 is formed, and the lower transverse sidewall portion 70b of the inner transverse sidewall 70 where the screening section 40 is formed; and a cover 91 for the grain sieve loading / unloading window 90. The grain sieve loading / unloading window 90 of the outer transverse sidewall portion 71 is configured to be covered by the lower rear cover 75. The grain sieve loading / unloading window 90 of the inner transverse sidewall portion 70b is located below the bagging box 11.

[0107] Each of the aforementioned covers 91 is mounted and dismounted relative to the lower transverse sidewalls 70b and 71b by means of a locking part 92 provided on the lower end of the cover 91 in a manner that can be freely locked and acted upon by the locking part 92 provided on the lower end of the cover 91, and a pair of connecting bolts 93 and 93 installed on the upper end of the cover 91, thereby opening and closing the grain sieve loading and unloading window 90.

[0108] In other words, when the type of crop being harvested changes, the grain sieve 55 should be replaced with a grain sieve equipped with appropriately sized processing material drop holes. This replacement should be carried out according to the following guidelines.

[0109] In other words, the lower rear cover 75 and the cover 91 located behind the lower rear cover 75 are removed, and the grain sieve loading and unloading window 90 of the outer transverse side wall 71 is opened. The connection or disconnection between one end of the grain sieve 55 and the sieve box 50 via the connecting bolts is then performed through the grain sieve loading and unloading window 90. The cover 91 located below the bagging box 11 is removed, and the grain sieve loading and unloading window 90 of the inner transverse side wall 70 is opened. The connection or disconnection between the other end of the grain sieve 55 and the sieve box 50 via the connecting bolts is then performed through the grain sieve loading and unloading window 90 of either the outer transverse side wall 71 or the inner transverse side wall 70. The grain sieve 55 is then placed in and removed from the screening chamber 41 through the grain sieve loading and unloading window 90 of either the outer transverse side wall 71 or the inner transverse side wall 70.

[0110] like Figure 5 , Figure 15 As shown, the top plate 34 is connected to the frame 95 via three pivot mechanisms 94 arranged along the front-rear direction of the vehicle body at the end of the top plate 34 on the lateral outer side of the vehicle body.

[0111] In other words, the top plate 34 swings downward relative to the frame 95 about the opening and closing axis Y of the connecting pins 94a of the aforementioned pivot mechanisms 94 in the longitudinal direction of the traveling machine body, so that the free end 34a of the top plate 34 abuts against the frame 96, thereby closing the upper opening 97 of the threshing chamber. At this time, by causing the three locking members 98 arranged in the longitudinal direction of the traveling machine body at the free end of the top plate 34 to act on the frame 96, the top plate 34 can be fixed in the closed position.

[0112] By causing the top plate 34 to swing upwards relative to the machine frame 95 around the aforementioned opening and closing axis Y, the upper opening 97 of the threshing chamber can be opened. The threshing drum 32 can be inspected and cleaned through this upper opening 97, and the receiving net 33 can also be pulled out of the threshing chamber 31 through the upper opening 97. The receiving net 33 is then pulled out by dividing it into two separate receiving nets along the circumference of the threshing drum.

[0113] like Figure 15 As shown, the aforementioned top plate 34 has reinforcing plates 100 at both ends of the vehicle body in the transverse direction on its outer surface. For example... Figure 15 , Figure 16 As shown, each of the reinforcing plates 100 is connected to the top plate 34 by means of connecting bolts 101 at the positions corresponding to the ends of the three dust valves 35 located at the front of the threshing chamber.

[0114] In other words, because the front of the threshing drum 31 contains more grains and straw than the rear, the dust valve 35 located at the front of the threshing chamber 31 experiences a stronger reaction force than the dust valve 35 located at the rear. Therefore, each reinforcing plate 100 increases the support strength to firmly support the dust valve 35 against the top plate 34.

[0115] like Figure 4 As shown, the screening device 42 is connected to the support frame 102 in a manner that allows for free loading and unloading via a loading and unloading mechanism 103 provided across the rear end side of the screening box 50 and the support frame 102 that is linked to the screening drive mechanism 46.

[0116] In other words, the dust hood 48 is removed from the threshing machine body, the dust outlet 47 is opened, and a hand is inserted into the screening chamber 41 through the dust outlet 47. The connection between the screen box 50 and the support frame 102, achieved by the loading and unloading mechanism 103, is then released, and the screening device 42 is moved to the rear of the threshing machine body. By sliding and guiding the screen box 50 using the pair of left and right guide rails 104, 104 provided on the support frame 102, the screening device 42 can be moved through the threshing chamber towards the dust outlet 47. The entire screening device 42 can then be easily pulled out of the machine body from the dust outlet 47.

[0117] As an alternative to the upper transverse sidewall portion 71b in the above embodiment, a structure that opens and closes by swinging around an axis located at the front end of the upper transverse sidewall portion in the vertical direction toward the threshing machine body, or a structure that opens and closes by swinging around an axis located at the upper end of the upper transverse sidewall portion in the front-rear direction toward the threshing machine body, can also be used. The objective of the present invention can be achieved in all these cases.

[0118] [Second Implementation]

[0119] The second embodiment of the present invention will now be described with reference to the accompanying drawings.

[0120] Figure 17 This is a left-side view of the combine harvester according to the second embodiment of the present invention. Figure 18 This is a right-side view of the combine harvester according to the second embodiment of the present invention. Figure 19 This is a top view of the combine harvester according to the second embodiment of the present invention. As shown in these figures, the combine harvester of the present invention includes: a traveling body that is self-propelled by a pair of tracked traveling devices 201, 201 on the left and right sides, and has a driver's section 202 with a driver's seat 202a installed thereon; a threshing machine 204 installed on the rear side of the body frame 203 of the traveling body; a grain bagging section 210 equipped with a bagging box 211 provided on the lateral side of the threshing machine 204; and a harvesting section 220 with a feeding device 221 connected to the front of the threshing machine 204.

[0121] The combine harvester harvests rice, wheat, and other crops.

[0122] In other words, in addition to the aforementioned feeding device 221, the harvesting unit 220 also includes: a harvester frame 222 connected to the front end of the feeding device 221; dividers 223 disposed on both sides of the front end of the harvester frame 222; a pusher-shaped harvesting device 224 disposed on the front end of the frame portion 222a of the harvester frame 222 and configured to be freely rotatable; a screw feeder 225 disposed on the harvester frame 222 near the rear of the harvesting device 224 and on the upper surface of the frame portion 222a; and a rotating drum 227 supported on a pair of left and right support arms 226, which extend forward from the upper part of the base end side of the harvester frame 222.

[0123] The aforementioned feeding device 221, under the action of the hydraulic cylinder 228, swings up and down relative to the thresher 204 around the lifting axis P which faces laterally towards the machine body. This allows the harvesting unit 220 to move from a lowering operation state (where the platform portion 222a of the harvester frame 222 is lowered to near the ground) to a non-operational state (where the harvester frame 222 is significantly raised from the ground). When the machine body is traveling in the lowering operation state, the harvesting unit 220 performs the harvesting of upright straw and the supply of harvested straw to the thresher 204.

[0124] In other words, a pair of dividers 223 on the left and right sides separate the upright stalks into harvestable and non-harvestable types. Then, while the upright stalks to be harvested are raken together by the rotating drum 227 and harvested by the harvesting device 224, the harvesting device 224 is used for harvesting. The harvested stalks are laterally conveyed along the frame section 222a to the front of the feeding device 221 by the spiral plates 225a located at both ends of the spiral feeder 225. The harvested stalks that have reached the front of the feeding device 221 are fed into the inlet of the feeding device 221 located at the rear of the spiral feeder 225 by the gathering and conveying arm 225b, which is integrally rotatable and set in the middle of the spiral feeder 225. Then, the harvested stalks fed into the feeding device 221 are conveyed to the rear by the conveyor 229 located inside the feeding device 221. Using the conveyor 229, the harvested straw from the root to the tip of the ear is fed into the threshing chamber (not shown) of the threshing machine 204.

[0125] like Figure 29 As shown, the end portion 225c of each of the spiral plates 225a of the spiral feeder 225 is made of steel wire welded to the spiral plates 225a.

[0126] In other words, when wear occurs on the end portion 225c of the spiral plate 225a, it can be repaired simply by replacing the end portion 225c by installing new steel wire to replace the worn steel wire.

[0127] The threshing machine 204 uses a threshing drum (not shown) that rotates the harvested straw that is fed into the threshing chamber to perform threshing.

[0128] like Figure 18 As shown, the grain bagging section 210, in addition to the bagging box 211, also has a bag support section. This bag support section uses a bag support rod 213 to support the upper end of the grain bag mounted on the discharge cylinder 212, and uses a bag receiving platform 214 to support the lower end of the grain bag. The discharge cylinder 212 is located below the bagging box 211.

[0129] Bag box 211 utilizes winnowing device 215 (see reference) Figure 18 The hulled grains are supplied to the screening section (not shown) of the thresher 204 and stored thereon, and the stored hulled grains are discharged from the discharge cylinder 212 into the grain bag.

[0130] like Figure 18 , Figure 19 As shown, the grain bagging section 210 has a pair of front and rear operating aids 216, 216. Each operating aid 216 can be switched as follows: Figure 18 and Figure 19 The solid line shows the lowering posture, protruding from the bag support to the lateral outer side of the vehicle body, and as shown in the figure. Figure 18 The upward receiving posture, indicated by the double-dotted line, located above the bagging box 211, is supported. By switching each work aid 216 to a downward use posture, each work aid 216 is positioned at a height H of 1.0 to 1.1 m above the upper surface of the bag receiving platform 214, allowing the user riding on the grain bagging section 210 to use it as a back support.

[0131] like Figure 30 , Figure 31 , Figure 32 As shown, the driver's seat 202a is supported on a seat support platform 233 via a pair of left and right mounting members 230, 230 located on the lower surface of the driver's seat 202a, a connecting shaft 231 located at the front end of the pair of left and right mounting members 230, 230, and support members 232 that rotatably support the two ends 231a of the connecting shaft 231 by support plate portions 232a. The seat support platform 233 serves as an engine cover covering the engine 205. Each mounting member 230 is placed and supported on the upper surface of the seat support platform 233 via cushioning rubber 234 mounted on the rear end of the mounting member 230 and cushioning rubber 234 mounted on the connecting shaft mounting member 230a.

[0132] The aforementioned seat support platform 233 has a seat fixing mechanism 236 equipped with a seat fixing body 235, which is disposed on the upper surface side of the seat support platform 233. In addition to the seat fixing body 235, the seat fixing mechanism 236 also has a locking pin 237 that can be freely attached and detached from the seat fixing body 235. By installing the locking pin 237 onto a pair of left and right longitudinal plates 235a, 235a of the seat fixing body 235, the seat fixing mechanism 236 prevents the locking pin 237 from moving upwards and swinging around the axis of the end 231a of the connecting shaft 231, thereby securing the driver's seat 202a in a lowered usage position.

[0133] In other words, by removing the locking pin 237 from the seat fixing body 235, the seat fixing mechanism 236 can be released from fixing the driver's seat 202a. As a result, the driver's seat 202a can be raised and swung relative to the seat support platform 233, thereby switching to an open maintenance raised and open posture above the seat support platform 233.

[0134] The rotating drum 227 described above is explained below.

[0135] Figure 21 This is a side view of the aforementioned rotating drum 227. Figure 22 This is a top view of the aforementioned rotating drum 227. Figure 23 This is a front view of one end of the aforementioned rotating drum 227. Figure 24 This is a front view of the other end of the aforementioned rotating drum 227. As shown in these figures, the rotating drum 227 has: a drive shaft 240 that is rotatably supported at the ends of the pair of support arms 226, 226; a drum frame 241 that is integrally and rotatably disposed at the left and right ends of the drive shaft 240 and is pentagonal when viewed from the side of the vehicle body; and toothed support portions 242 made of circular tubular material, which are arranged circumferentially on the rotating drum 227 across the pair of left and right drum frames 241, 241, and are arranged such that one is on each of the five tops of the drum frames 241.

[0136] Each of the aforementioned roll frames 241 comprises: a sheet metal roll frame body 241b having five arms 241a; a resin block 243 disposed at the end of each arm 241a; and an annular strip plate 244 wound across the five blocks 243 and connected to the arms 241a by common fastening bolts shared with the blocks 243. Each block 243 constitutes a mounting portion for the toothed support portion 242, which can be rotatably mounted. The annular strip plate 244 is composed of segmented strip plates divided at portions of each arm 241a.

[0137] The rotating drum 227 has: teeth 245 and 246 arranged on the tooth support portion 242 along the direction of the rotating drum rotation axis X1 (hereinafter referred to as the drum rotation axis X1) of the drive shaft 240; and a tooth holding mechanism 260 disposed on the lateral outer side of one side of the rotating drum 227, having an auxiliary rotating body 261 that is pentagonal when viewed from the side of the traveling body.

[0138] The pair of support arms 226, 226 of the rotating drum 227 are operated by a hydraulic cylinder 250 connected to one of the support arms 226, 226 and the harvester frame 222, which swings up and down relative to the harvester frame 222 around the axis Y1 of the connecting shaft 251, thereby rotating the drum 227 to a lowering working state and an upward non-working state.

[0139] Figure 25 This is a side view of the rotating drum 227 in its lower position during descent. As shown in the figure, during descent, the pair of support arms 226 on the left and right sides lower the rotating drum 227 so that its lower end is near the ground G, thus placing the rotating drum 227 in its lower position during descent. In this way, by rotating the drive shaft 240, the rotating drum 227 rotates around its rotation axis X1, causing the teeth 245 and 246 of each tooth support 242 to rotate around the rotation axis X1 in the rotation direction A. Each tooth 245, 246 rotates while maintaining a downwardly extending posture from the tooth support 242 under the action of the tooth holding mechanism 260. The ends 245a, 246a of each tooth 245, 246 trace a rotation trajectory T. This rotation trajectory T moves behind the end 223a of the divider 223 at a ground height H1 lower than the ground height H1 of the end 223a of the divider 223, and in front of the harvesting device 224 at a ground height H2 lower than the ground height H2 of the end of the harvesting device 224.

[0140] Therefore, even if the upright stalks are deeply lodged, and even if there are upright stalks that are not affected by the divider 223, the rotating drum 227 can still make each tooth 245, 246 precisely lock the upright stalks and rake them together to supply them to the harvesting device 224.

[0141] Figure 26 This is a side view of the high-position side of the rotating drum 227 during the descent operation. As shown in the figure, when the lower end of the rotating drum 227 is positioned slightly away from the ground G during the descent operation, the rotating drum 227 is in the high-position side descent operation state. Thus, by rotating the drive shaft 240, the rotating drum 227 rotates around the drum rotation axis X1, causing the teeth 245 and 246 of each tooth support 242 to rotate in the rotation direction A around the drum rotation axis X1. Each tooth 245 and 246 rotates while maintaining a downwardly extending posture from the tooth support 242 under the action of the tooth holding mechanism 260. The ends 245a and 246a of each tooth 245 and 246 trace a rotation trajectory T1, which moves behind the end 223a of the divider 223 at a ground height H1 higher than the ground height H1 of the end 223a of the divider 223.

[0142] Therefore, in the descent operation state on the high side, regardless of the forward or backward tilt of the traveling machine, the rotating drum 227 can harrow and supply the upright straw to the harvesting device 224 while avoiding the teeth 245 and 246 from touching the ground.

[0143] like Figure 27As shown, the aforementioned drum rotation axis X1 is configured such that, in the descending operation state of the rotating drum 227, the straight line S between the drum rotation axis X1 and the harvesting device 224 becomes a vertical line perpendicular to the upper surface of the harvesting blade of the harvesting device 224. Even if the extension angle of each tooth 245, 246 extending from the tooth support 242 is changed, it can effectively prevent the straw from floating up from the harvesting device 224 and being supplied to the harvesting device 224.

[0144] In other words, Figure 27 The solid lines indicate teeth 245 and 246, which are teeth supported on tooth support 242 at a standard extension angle. Figure 27 The dotted lines indicate teeth 245 and 246, which are supported in a backward tilted position compared to the standard extension angle. Figure 27 The double-dotted lines indicate that teeth 245 and 246 are supported in a forward-leaning posture compared to the standard extension angle. As these lines show, even if the extension angle of teeth 245 and 246 extending from the tooth support 242 is changed, teeth 245 and 246 can be moved above the harvesting device 224 without significantly changing the interval between the tooth tip and the harvesting device 224.

[0145] Of the plurality of teeth 245 and 246 supported on the aforementioned tooth support portions 242, the teeth 246 located on the left and right transverse ends of the rotating drum are designated as end-side teeth 246, and the teeth 245 located on the inner side of the rotating drum are designated as inner-side teeth 245. The end-side teeth 246 and inner-side teeth 245 of each tooth support portion 242 are constructed from a solid iron round rod extending from the tooth support portion 242. Figure 22 , 23 As shown, each pair of the inner teeth 245 of each tooth support portion 242 is made of a round rod material, which is bent into shape such that it has the inner teeth 245 at both ends and a connecting portion 247 in the middle that is connected to the tooth support portion 242.

[0146] The end teeth 246 have an outer diameter greater than that of the inner teeth 245, such that the bending strength of each end tooth 246 of each tooth support portion 242 is greater than that of each inner tooth 245.

[0147] In other words, at the transverse end of the rotating drum 227, sometimes the upright stalks of unharvested land become tangled, requiring a large reaction force to be applied to the end teeth 246 to rake them together. Therefore, even when subjected to a large reaction force from the stalks, the end teeth 246 do not bend, but rather lock onto the upright stalks, firmly rakeing the stalks together into the harvesting device 224.

[0148] On the other hand, inside the rotating drum 227, there is no tangling of upright straw from unharvested land, allowing for the raking of upright straw with minimal reaction force applied to the inner teeth 245. Therefore, the inner teeth 245 are more likely to bend and lock upright straw under the reaction force from the straw, enabling the straw to be quickly raked into the harvesting device 224.

[0149] like Figure 21 As shown, each inner tooth 245 of each tooth support 242 is formed in a bent state where the end side of the inner tooth 245 is closer to the outer periphery of the rotating drum than the end side of the end tooth 246.

[0150] In other words, if the end teeth 246 of the rotating drum 227 are grounded, they are more prone to deformation or breakage because they have greater bending strength than the inner teeth 245. However, even when the rotating drum 227 is grounded, the inner teeth 245 are grounded while the end teeth 246 are not. The inner teeth 245 are prone to elastic deformation due to their lower bending strength, while the end teeth 246 are not grounded and therefore do not undergo plastic deformation or breakage. Thus, it is difficult for both the inner teeth 245 and the end teeth 246 to undergo plastic deformation or breakage.

[0151] like Figure 21 As shown, the five toothed support portions 242 are respectively designated as a first toothed support portion 242A, a second toothed support portion 242B, a third toothed support portion 242C, a fourth toothed support portion 242D, and a fifth toothed support portion 242E. Except for the pair of toothed support portions 242, 242 formed by the first toothed support portion 242A and the fifth toothed support portion 242E adjacent in the rotation direction of the rotating drum, the other paired toothed support portions (i.e., the pair of toothed support portions 242, 242 formed by the first toothed support portion 242A and the second toothed support portion 242B, the pair of toothed support portions 242, 242 formed by the second toothed support portion 242B and the third toothed support portion 242C, the pair of toothed support portions 242, 242 formed by the third toothed support portion 242C and the fourth toothed support portion 242D, and the pair of toothed support portions 242, 242 formed by the fourth toothed support portion 242D and the fifth toothed support portion 242E), as shown... Figure 22 As shown, an inner tooth set having multiple inner teeth 245 supported by one tooth support 242 and an inner tooth set having multiple inner teeth 245 supported by another tooth support 242 are staggered along the direction of the drum rotation axis by a distance D2 that is approximately half of the mounting interval D1 (hereinafter referred to as the inner tooth mounting interval D1) of the inner teeth 245 in the inner tooth set of each tooth support 242 in the direction of the drum rotation axis.

[0152] In other words, in the pair of tooth supports 242, 242 formed by the first tooth support 242A and the second tooth support 242B, the pair of tooth supports 242, 242 formed by the second tooth support 242B and the third tooth support 242C, the pair of tooth supports 242, 242 formed by the third tooth support 242C and the fourth tooth support 242D, and the pair of tooth supports 242, 242 formed by the fourth tooth support 242D and the fifth tooth support 242E, the inner teeth 245 of one tooth support 242 are arranged circumferentially with each other and the inner teeth 245 of the other tooth support 242. Thus, even if there are upright stalks that are not caught between the inner teeth 245 of the toothed support 242 located below the rotating drum 227, the rotating drum 227 can still catch the upright stalks with the inner teeth 245 of the next arriving toothed support 242 and rake the upright stalks into the harvesting device 224 in this state.

[0153] like Figure 23 , 24 As shown, the rotating drum 227 has a toothed cover 253 mounted on each of the toothed support portions 242. (As indicated...) Figure 28 As shown, each of the aforementioned tooth covers 253 covers the connecting portion 247 of the inner tooth 245 to prevent straw or other debris from becoming entangled on the connecting portion 247. Each tooth cover 253 is made of a resin cylinder with a slit 254 along its entire length. By elastically deforming the slit 254 to an open state, it can be attached to and detached from the tooth support portion 242 through the open slit 254.

[0154] Figure 21 This shows the side view of the tooth retaining mechanism 260 described above. Figure 23 The figures show the front view of the tooth holding mechanism 260. As shown in these figures, in addition to the auxiliary rotating body 261, the tooth holding mechanism 260 also includes: a support body 262 that is circular when viewed from the side of the rotating drum and is supported on the protrusion 226a of the support arm 226; and a connecting rod 263 that is provided across the auxiliary rotating body 261 and the drum frame 241 corresponding to each tooth support portion 242.

[0155] The aforementioned support body 262 is externally fitted into the aforementioned protrusion 226a at the mounting hole 262a and fixed to the support plate 264 connected to the protrusion 226a by fixing bolts 265. The support body 262 has three support rollers 266, which are engaged in the circular mounting hole 261a of the aforementioned auxiliary rotating body 261 and distributed around the periphery of the support body 262. The auxiliary rotating body 261 is pivotally supported on the aforementioned support body 262 by the aforementioned three rollers 266 and rotates about an axis Z eccentrically disposed at the center of the aforementioned support body 262 from the aforementioned drum rotation axis X1. The drum frame side end of each of the aforementioned connecting rods 263 is integrally and freely rotatably connected to the rotation support shaft 242a of the corresponding aforementioned toothed support 242. The auxiliary rotating body side end of each of the aforementioned connecting rods 263 is freely rotatably connected to the top of the auxiliary rotating body 261.

[0156] Thus, as the rotating drum 227 rotates, the tooth holding mechanism 260 causes the auxiliary rotating body 261 to rotate around an axis Z different from the rotating axis X1 of the drum by means of the driving force transmitted from the rotating drum 227 via the connecting rod 263. The connecting rod 263 rotates the rotating support shaft 242a of each tooth support 242, thereby rotating each tooth support 242 relative to the drum frame 241. Regardless of the rotation of the rotating drum 227, it can be operated to maintain the position in which the end teeth 246 and inner teeth 245 of each tooth support 242 extend downward from the tooth support 242.

[0157] Figure 33 This is a side view of the toothed portion of the rotating drum 227 having the second embodiment structure.

[0158] The rotating drum 227 with the second embodiment structure has an end side tooth 246 and an inner side tooth 245, and the extension length L1 of the end side tooth 246 extending from the tooth support portion 242 is set to be shorter than the extension length L2 of the inner side tooth 245 extending from the tooth support portion 242.

[0159] In other words, if the rotating drum 227 is grounded via the end teeth 246, the end teeth 246 are more prone to deformation or breakage because they have greater bending strength than the inner teeth 245. However, even when the rotating drum 227 is grounded, the inner teeth 245 are grounded while the end teeth 246 are not. The inner teeth 245 are more prone to elastic deformation due to their lower bending strength, while the end teeth 246 are not grounded and therefore do not undergo plastic deformation or breakage. Thus, it is difficult for both the inner teeth 245 and the end teeth 246 to undergo plastic deformation or breakage.

[0160] As an alternative to the inner tooth 245 in the above embodiment, the following structure can also be adopted: the inner tooth 245 is shaped into a curved state with sharp edges, so that the end side of the inner tooth 245 is closer to the outer periphery of the rotating drum than the end side of the end tooth 246. In this case, the object of the present invention can also be achieved.

Claims

1. A harvester, comprising a freely rotating rotary drum (227) on a harvesting section (220) for rakes upright straw into a harvesting device, characterized in that, The teeth arranged on the rotating drum (227) along the rotation axis include end teeth (246) located on the transverse end side of the rotating drum and inner teeth (245) located on the inner side of the rotating drum. An inner tooth set having multiple inner teeth (245) supported by one of the tooth support portions (242) of a pair of adjacent tooth support portions (242) in the rotation direction of the rotating drum (227), and an inner tooth set having multiple inner teeth (245) supported by the other tooth support portion (242) of the pair of tooth support portions (242), are arranged at offset positions in the rotation axis direction of the rotating drum. The bending strength of the end teeth (246) is set to be greater than that of the inner teeth (245).

2. The harvester as described in claim 1, characterized in that, The aforementioned end teeth (246) and the aforementioned inner teeth (245) are each made of solid iron round rod material extending from the tooth support portion (242) of the aforementioned rotating drum (227).

3. The harvester as described in claim 1 or 2, characterized in that, By bending a round rod material into shape, two inner teeth (245) are formed at both ends of the round rod material, and a connecting part (247) is formed in the middle part of the round rod material to connect with the tooth support part (242) of the rotating drum (227). On the rotating drum (227), the two inner teeth (245) are adjacent in the direction of the rotation axis of the rotating drum.

Images