Harvester

Abstract

To provide a harvester capable of efficiently harvesting long-stalked cereals.SOLUTION: A harvester comprises a cutting blade 31 configured to cut crops, and a gathering reel 37 configured to gather the crops. The harvester further comprises a pair of left and right extension portions 51 extending forward, and a pushing-down portion 53 provided across the pair of extension portions 51 and disposed in front of the cutting blade 31 and the gathering reel 37.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a harvester. [Background technology]

[0002] Patent Document 1 discloses a full-type combine harvester that rakes in stumps to harvest. The stump rake-in device of this full-type combine harvester is equipped with a sensor arm at the front end of one of the support arms that supports the stump rake-in reel, and the sensor arm is equipped with three stump length sensors arranged vertically. The support arm is then swung so that only the top stump length sensor does not detect stumps, thereby raising and lowering the stump rake-in reel to the appropriate rake-in position, thereby accurately performing the rake-in operation. Patent Document 2 discloses a conventional combine harvester that harvests standing crops by raking them in. This conventional combine harvester is equipped with a divider having vertical walls and guide plates, and the crop to be harvested is divided by the divider and vertical walls and guided inside the guide plates for reaping and harvesting. Patent Document 3 discloses a riding mower equipped with a front bumper. This riding mower uses a grass stem pushing edge on the front bumper to push down grass stems into a certain position, aligning them and making them easier to cut. Patent Document 4 discloses a crop harvesting mechanism equipped with a tilting bar. This crop harvesting mechanism has a tilting bar located behind and above the tip of the cutting blade, so that the crop that has been cut by the cutting blade and comes into contact with the tilting bar is transported from the base of the plant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 02-076514

[0004] [Patent Document 2] Japanese Patent Application Publication No. 2019-198304

[0005] [Patent Document 3] Patent Publication No. 2021-013307

[0006] [Patent Document 4] Japanese Patent Application Publication No. 2017-163868 Summary of the Invention [Problem to be solved by the invention]

[0007] Demand for miscellaneous grains such as cereals and oilseed crops has increased in recent years due to the health-conscious trend, and expectations are growing for them to be used as regional revitalization crops due to their high selling prices and their suitability for cultivation in mountainous and hilly areas. However, many of these miscellaneous grains are prone to grain shedding due to contact of the raking reel with the ears. In Patent Document 1, a culm length sensor and a grain stalk raking reel are raised and lowered to a height near the ears of the crop, ensuring that the stalks are raked in at the appropriate raking position, but this does not prevent the grain stalk raking reel from coming into contact with the ears. In Patent Document 2, the raking reel is also prone to coming into contact with the ears. For this reason, when harvesting miscellaneous grains using a regular combine harvester such as those in Patent Documents 1 and 2, the ears are struck by the rotating raking reel, causing grain shedding and the grain to fall in front of the platform, raising the risk of significant grain loss. Additionally, miscellaneous grains include crops with long stems exceeding 2 meters, such as sorghum. Such long-culm crops are prone to entanglement with neighboring crops and various parts of the harvester due to stems being knocked over by strong winds and ears and leaves spreading under their own weight. Therefore, when harvesting miscellaneous grains using a conventional combine harvester such as those described in Patent Documents 1 and 2, there is a concern that the crop may become entangled in the reel or reel tines, resulting in reduced work efficiency. Furthermore, when harvesting long-culm crops with a conventional conventional combine harvester, the cutting blade attached to the tip of the platform is set high above ground, and a cutting method known as high cutting is performed using the cutting blade. The raking reel is also set even higher to rake the long-culm crop into the platform auger. However, depending on the long-culm crop, the cut culms may be higher than the set upper limit of the raking reel, preventing the raking reel from raking the cut crop, resulting in the crop continuing to pile up above the platform auger, resulting in unharvested crops. Meanwhile, Patent Document 3 discloses a grass stem pushing edge that pushes down grass stems into a fixed position and aligns them. Patent Document 3 is a document related to a grass mower, and the long grass stems pushed down by the grass stem pushing edge are cut by a rotating plate attached to the underside of the vehicle body. However, because it is intended solely for mowing, it does not take into consideration the loss of grain like a harvester. Furthermore, because the grass stem pushing edge is linear and extends left and right, some tall grass stems that are pushed down are pushed forward, while some grass stems that hit the outer part of the grass stem pushing edge fall outside the vehicle body instead of forward, which does not have the effect of eliminating entanglement with adjacent crops. Furthermore, the tilting bar in Patent Document 4 is designed to transport crops from the base of the plant after harvesting, and is located behind the tip of the cutting blade, which makes it less effective in preventing tangled crops before harvesting. As described above, it is difficult for conventional harvesters such as normal combine harvesters to efficiently harvest long-stemmed miscellaneous grains, and therefore there has been a demand for a harvester that can efficiently harvest long-stemmed miscellaneous grains. [Means for solving the problem]

[0008] One aspect of the present invention is a harvester equipped with a cutting blade for cutting crops and a raking reel for raking the crops, and the harvester is equipped with a pair of left and right extension sections that extend forward, and a pushing section that is provided across the pair of extension sections and is positioned forward of the cutting blade and the raking reel. [Effects of the Invention]

[0009] According to the harvester of the present invention, when harvesting long-culm miscellaneous grains, the culms of the crop, which have been freed from entanglement with neighboring crops by the extension members, are guided to the inside of a pair of extension members, guided to the pushing-down section spanning the extension members, pushed down by the pushing-down members, and then cut with the cutting blade. This makes it less likely that the crop to be harvested will become entangled with various parts of the harvester, such as the raking reel, and reduces declines in work efficiency. Furthermore, by pushing the crop forward with the pushing-down section, the raking reel is less likely to come into contact with the crop's ears, reducing grain loss. This makes it easier to efficiently harvest long-culm miscellaneous grains. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a left side view of the harvester according to the first embodiment. [Figure 2] FIG. 2 is a perspective view of a reaping unit according to the first embodiment. [Figure 3] FIG. 2 is a left side view of the reaping unit according to the first embodiment. [Figure 4] FIG. 10 is a perspective view of a reaping unit according to a second embodiment. [Figure 5] FIG. 10 is a plan view of a reaping unit according to a second embodiment. [Figure 6] FIG. 10 is a perspective view of a reaping unit according to a modified example of the second embodiment. [Figure 7] FIG. 11 is a perspective view of a crop pushing structure according to a third embodiment. [Figure 8] FIG. 10 is a left side view of the rear part of the extension member according to the fourth embodiment. [Figure 9] FIG. 11 is a left side view of the rear part of the extension member in a state where the angle is changed according to the fourth embodiment. [Figure 10] FIG. 13 is a left side view of the front part of the extension member according to the fifth embodiment. [Figure 11]FIG. 11 is a perspective view of a reaping unit according to a modified example of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (Embodiment 1) (composition) (Basic configuration) FIG. 1 is a left side view of a combine harvester 1 according to a first embodiment. In the drawing, X indicates the right direction of the combine harvester 1, Y indicates the forward direction of the combine harvester 1, and Z indicates the upward direction. The forward direction of the combine harvester 1 is the direction in which a reaping unit 30 (described below) is provided, relative to the machine body 10. In the following description, the right direction is the direction of the right hand side of a person riding on the combine harvester 1 and facing forward.

[0012] The combine harvester 1 is an agricultural machine that cuts and harvests crops while traveling. The combine harvester 1 includes a body 10 that threshes and stores the harvested crops, a pair of left and right crawlers 11 that are mounted on the bottom of the body 10 and support the body 10, a feeder 17 that is mounted in front of the body 10 and transports the cut crops toward the body 10, and a reaping unit 30 that is mounted at the tip of the feeder 17 and cuts the crops planted in a field or the like. The combine harvester 1 travels by being driven by the pair of left and right crawlers 11. The combine harvester 1 corresponds to an example of the "harvester" of the present invention.

[0013] The machine body 10 incorporates a threshing and sorting unit that threshes and sorts the harvested crops into grain, as well as a grain tank that stores the grain. The grain stored in the grain tank is discharged to the outside by a discharge auger 13 provided above the machine body 10. A driving and operating unit 15 on which the driver sits is provided at the front of the machine body 10. The driving and operating unit 15 is provided with levers, switches, etc. for operating the combine harvester 1 and for performing various operations.

[0014] A feeder 17 extending forward is provided at the front end of the machine body 10. The feeder 17 transports harvested crops to the threshing and sorting section. The machine body 10 also has a built-in internal combustion engine, generator, battery, or the like that supplies power and electricity to each section, such as the crawler 11 and the threshing and sorting section.

[0015] (Configuration of the harvesting section) Fig. 2 is a perspective view of the reaping unit 30 according to the first embodiment. Fig. 3 is a left side view of the reaping unit 30 according to the first embodiment. The reaping unit 30, which reaps crops, is provided on the front side of the machine body 10. The reaping unit 30 includes a platform 33 fixed to the front end of the feeder 17, a cutting blade 31 attached to the lower front end of the platform 33, and a raking reel 37 rotatably supported on the platform 33 via an arm member 39.

[0016] The platform 33 is a bucket-shaped structure that opens forward and upward. The cutting blade 31 is of a reciprocating type and moves back and forth in the left and right directions along the lower front end of the platform 33 to cut crops planted in the field. The platform 33 receives the crops cut by the cutting blade 31 at the lower front end.

[0017] A platform auger 34 is provided inside the platform 33. The platform auger 34 has a rotation shaft extending in the left-right direction. The platform auger 34 is supported on the platform 33 so as to be rotatable. The platform auger 34 is driven to rotate, thereby transporting the crops received by the platform 33 toward the feeder 17. In other words, the crops cut by the cutting blade 31 are transported to the threshing and sorting section of the machine body 10 via the platform 33, the platform auger 34, and the feeder 17.

[0018] A pair of left and right dividers 35 protruding forward are provided at the front end of the platform 33. The dividers 35 are positioned outboard of the cutting blade 31 in the left-right direction. When harvesting with the combine 1, the dividers 35 separate only the crops in the ridge to be harvested from the adjacent crops in the ridge adjacent to the ridge to be harvested at approximately the height of the cutting blade 31 above ground, and guide the grass to the cutting blade 31.

[0019] A raking reel 37 is provided above the reaping unit 30. When power is transmitted to the raking reel 37, the raking reel 37 rotates in a direction in which the lower part faces rearward, with the axis extending in the left-right direction. A large number of reel tines forming a comb-like shape are attached to the raking reel 37.

[0020] The take-in reel 37 is supported by being stretched across a pair of left and right arm members 39. The arm members 39 extend forward from above the rear end of the platform 33. The arm members 39 are configured to be able to swing up and down around their rear ends as an axis. The pair of arm members 39 swing due to the extension and contraction of a reel cylinder 38 connecting the left arm member 39 to the platform 33 (see FIG. 1). This causes the position of the take-in reel 37 to move up and down. The right arm member 39 is provided with a transmission case 36 that transmits power to the take-in reel 37, and the transmission case 36 incorporates a pulley, belt, etc. for rotating the take-in reel 37 (see FIG. 1). Each arm member 39 is further provided with a fastening portion 39a having a screw hole for fastening an extension member 51, which will be described later.

[0021] The reaping unit 30 is provided with a crop pushing structure 50. The crop pushing structure 50 has an extension member 51 and a pushing member 53.

[0022] The extension members 51 are bent plate members that are attached to the fastening portions 39a of the arm members 39 by fastening and extend forward. In this embodiment, the extension members 51 are formed by bending a metal plate into a U-shaped cross section. The extension members 51 are positioned outward in the left-right direction from the take-up reel 37. The extension members 51 also extend forward from the push-down members 53 that are installed in front of the take-up reel 37. A rod-shaped reinforcing member 52 extending left and right is hung between the midpoints of the pair of left and right extension members 51. The extension members 51 are an example of an "extension portion" in the present invention.

[0023] The pushing-down member 53 is a member that is fixed in a state straddling the pair of left and right extension members 51, forward of the reinforcing member 52. In this embodiment, the pushing-down member 53 is a square pipe material. The pushing-down member 53 is located forward of the sweeping reel 37 and the cutting blade 31. The pushing-down member 53 is an example of a "pushing-down portion" in the present invention.

[0024] The pushing-down member 53 has a pair of fixing portions 54 fixed to the extension member 51 and a main body portion 55 connecting the pair of fixing portions 54. The fixing portions 54 are plate-shaped and are fixed to the extension member 51 by fastening them with bolts or the like. The extension member 51 has a large number of fixing holes 51a formed therein, and the position of the pushing-down member 53 in the front-to-rear direction can be changed by changing the fixing holes 51a to which the fixing portions 54 are fastened. In FIG. 2, the main body portion 55 is a rectangular pipe with a square cross section, but it may also be a pipe with a circular cross section, and the cross-sectional shape is not limited. Furthermore, in the case of a circular cross section, for example, the diameter of the cross section is not limited.

[0025] (operation) Next, the operation of the combine harvester 1 described above when harvesting crops will be described. In the following, the case where the combine harvester 1 harvests Takakibi, a type of miscellaneous grain, will be described. Note that in the following description, the description of directions such as forward refers to directions relative to the combine harvester 1.

[0026] The combine harvester 1 harvests sorghum while moving forward along the ridges. As the combine harvester 1 moves forward, the extension member 51, located at the front of the combine harvester 1, is inserted between the sorghum planted in the ridge to be harvested and the sorghum planted in the adjacent ridge. Sorghum is a long crop that grows to a height of approximately 1.5 to 2.5 meters. Because of its long height, the culms tend to fall or break, easily becoming entangled with sorghum plants in the adjacent ridges. In this embodiment, in addition to the divider 35, which divides the grass at a height roughly equivalent to the height of the cutting blade above ground, the extension member 51 at a height approximately equal to the height of the raking reel 37 above ground makes it easy to eliminate entanglement between the sorghum planted in the ridge to be harvested and the sorghum planted in the adjacent ridge, guiding only the sorghum planted in the ridge to be harvested between the pair of extension members 51.

[0027] As the combine harvester 1 moves forward, the main body 55 of the pushing member 53 comes into contact with the culms of the sorghum guided between the pair of extension members 51. When the combine harvester 1 moves forward with the main body 55 in contact with the sorghum culms, the sorghum above the root is pushed forward, causing the tip with the ear to be pushed forward. As a result, the sorghum falls toward the sorghum further forward. In this state, the ears of sorghum fall in a direction away from the raking reel 37, which is located behind the pushing member 53.

[0028] As the combine 1 moves further forward with the sorghum millet pushed forward, the cutting blade 31 reaches the sorghum millet culms and the millet is cut. At this time, the cut sorghum millet leans against the uncut sorghum millet in front, supporting it and reducing the risk of it tipping over into the field. The raking reel 37 then rakes in the leaves and culms from the cutting section, transporting the cut sorghum millet to the rear platform 33 with the ears facing forward. In this way, by cutting the sorghum millet while it is pushed forward by the pushing member 53, the sorghum millet can be harvested while preventing the ears from coming into contact with the raking reel 37.

[0029] (Effects, etc.) As described above, the combine 1 of this embodiment is a harvester equipped with a cutting blade 31 for cutting crops and a raking reel 37 for raking the crops, and is equipped with a pair of left and right extension members 51 extending forward, and a pushing member 53 that is arranged across the pair of extension members 51 and is positioned forward of the cutting blade 31 and the raking reel 37. As a result, when harvesting long-culm miscellaneous grains, the extension members 51 can be used to free the crop from entanglement with adjacent crops, and the crop can be guided into the space surrounded by the pair of extension members 51 and the pushing members 53, allowing the crop to be pushed down by the pushing members 53 and then cut by the cutting blade 31. This prevents the harvested crop from piling up above the platform auger 34, preventing a decline in work efficiency. Furthermore, by pushing the crop forward with the pushing members 53, it becomes less likely that the raking reel 37 will come into contact with the crop ears before they are raked into the platform 33, thereby reducing grain loss. This makes it easier to harvest long-culm miscellaneous grains efficiently.

[0030] (Embodiment 2) FIG. 4 is a perspective view of the reaping unit 30 according to the second embodiment. FIG. 5 is a plan view of the reaping unit 30 according to the second embodiment. In the second embodiment, a crop pushing structure 50 is provided, as in the first embodiment. In the first embodiment, a pushing member 53 having a linear main body 55 is fixed in a straddling state between a pair of extension members 51 of the crop pushing structure 50, but in this embodiment, the main body 255 of the pushing member 253 is formed so that a central portion 255a in the left-right direction is recessed backward. In FIG. 4, the central portion 255a is recessed backward by substantially the entire main body 255 being curved in an arc shape.

[0031] (operation) In the second embodiment, only the pushing member 253 of the crop pushing structure 50 is different from the first embodiment. As the combine harvester 1 moves forward, the extension member 51 disentangles the staghorn millet that has become entangled with the adjacent crop. However, because the central portion 255a of the pushing member 253 is concave toward the rear, the staghorn millet pushed down by the main body portion 255 falls in a direction such that the tip of the ear faces the center in the left-right direction and is gathered in the central portion 255a. Furthermore, the staghorn millet that has not been completely disentangled with the adjacent crop by the extension member 51 is actively disentangled by being gathered toward the center. The staghorn millet is then pushed down by the pushing member 253 and cut by the cutting blade. The cut staghorn millet is sent from the cutting section to the platform auger 34. This makes it easier for long-stemmed sorghum to fall over so that it is less likely to come into contact with sorghum in adjacent rows, making it easier to fall over while preventing entanglement with sorghum in adjacent rows.The sorghum that has been pushed over and cut is sent sequentially from the cutting section to the platform auger 34, preventing entanglement of the sorghum with each part of the cutting section 30 and also preventing grains from falling into the field due to contact with the raking reel.

[0032] In the first embodiment, the pushing member 53 does not move the crop to be harvested toward the center, so when the harvested staghorn that is closest to the extension member 51 is raked into the platform auger 34, the tip of the staghorn may get caught between the platform side cover 32 and the raking reel 37, and the staghorn may not be raked into the platform auger 34. According to the second embodiment, the harvested staghorn is moved toward the center, so the staghorn is raked into the platform auger 34 without getting caught between the platform side cover 32 and the raking reel 37.

[0033] (Effects, etc.) As in this embodiment, the pushing-down member 253 may be configured such that the central portion 255a in the left-right direction is recessed rearward. In the first embodiment, the extension member 51 makes it easier to dissolve entanglement with adjacent rows of crops, but with this configuration, in addition to the function of the first embodiment, the present embodiment can more actively dissolve entanglement of the harvested crop with adjacent rows. In addition, it is possible to prevent the harvested crop from being caught between the platform side cover 32 and the raking reel 37. The second embodiment makes it easier to efficiently harvest long-stemmed miscellaneous grains.

[0034] (Variation) FIG. 6 is a perspective view of a reaping unit 30 according to a modification of the second embodiment. As shown in FIG. 6, in the modification of the second embodiment, the main body 355 of the pushing member 353, which is provided across a pair of left and right extension members 51, has a trapezoidal bent shape, unlike the main body 255 of the second embodiment, which is curved in an arc shape almost entirely. Because of its trapezoidal bent shape, the main body 355 has a linear central portion 355a that is parallel to the left and right directions. The main body 355 also has a linear inclined portion 355b that connects the extension members 51 and the central portion 355a. The inclined portions 355b are provided in pairs on the left and right, and are inclined backward from the connection portion with the extension members 51 toward the central portion 355a.

[0035] In this way, the pushing-down members 253, 353 may have a central portion 255a that is recessed toward the rear by being smoothly curved, or may have a central portion 355a that is recessed toward the rear by being bent into a polygonal shape such as a trapezoid.

[0036] (Embodiment 3) FIG. 7 is a perspective view of a crop pushing structure 50 according to a third embodiment. The third embodiment includes a crop pushing structure 50 similar to that of the first embodiment. In the first embodiment, a pushing member 53 is fixed between a pair of extension members 51 of the crop pushing structure 50 in a straddling state. The crop to be harvested is pushed down by the pushing member 53 and then cut by the cutting blade 31. However, with easily shattered grains, such as perilla, contact with the pushing member 53 can lead to increased shedding due to frictional resistance between the pushing member 53 and the main body 55 of the pushing member 53, potentially resulting in increased losses. As shown in FIG. 7 , the third embodiment is configured such that a rotatable rotor 455 is attached to the outer periphery of the main body 55. The rotor 455 rotates when it comes into contact with the crop to be harvested, thereby reducing frictional resistance. Specifically, the rotor 455 is a cylindrical member extending in the left-right direction and is rotatable around the main body 55. In FIG. 7, the rotating body 455 has a length that is approximately the same as the width of the pair of extension members 51, but this is not limited to this and the rotating body 455 may have a length that is shorter than the width of the pair of extension members 51.

[0037] (operation) In embodiment 3, as the combine 1 moves forward, the harvested crops guided between the pair of extension members 51 come into contact with the rotating body 455 installed on the pushing member 53, and the rotating body 455 rotates according to the state in which the harvested crops are pulled into the platform 33, allowing the crops to be raked in with low contact resistance.

[0038] (effect) As in this embodiment, the pushing-down member 53 may be configured to have a rotor 455 on the outer periphery of the main body 55. As a result, in embodiment 3, when the crop to be harvested is scraped onto the platform 33, it is pushed down while coming into contact with the freely rotatable rotor 455 of the pushing-down member 53, and since the contact resistance between the crop to be harvested and the rotor 455 is small at this time, it is possible to reduce the shedding of grains from the crop to be harvested, making it easier to efficiently harvest long-stemmed miscellaneous grains.

[0039] (Fourth embodiment) Fig. 8 is a left side view showing the rear part of extension member 51 according to embodiment 4. Fig. 9 is a left side view showing the rear part of extension member 51 according to embodiment 4 in a state where the angle is changed.

[0040] In the fourth embodiment, unlike the first embodiment, the extension member 51 is attached to the arm member 39 via a first angle change member 160. The first angle change member 160 is fixed to the fastening portion 39a of the arm member 39 by fastening, and is a member that extends forward.

[0041] 8 and 9, first angle change member 160 is formed with first shaft hole 161 and first positioning holes 162, 163, 164, 165, and 166. First shaft hole 161 and first positioning holes 162 to 166 are holes that penetrate first angle change member 160 from left to right.

[0042] 8 and 9, the extension member 51 in the fourth embodiment is provided with a second shaft hole 151 and second positioning holes 152, 153, and 154. The second shaft hole 151 and each of the second positioning holes 152 to 154 are holes that pass through the extension member 51 in the left-right direction.

[0043] In the fourth embodiment, the extension member 51 is attached to the first angle change member 160 by fastening it at two locations. One of the two fastening locations on the extension member 51 is the second shaft hole 151, and is fastened together with the first shaft hole 161 using a bolt, nut, or the like. The other of the two fastening locations on the extension member 51 is one of the second positioning holes 152 to 154, and is fastened together with the first positioning holes 162 to 166 using a bolt, nut, or the like. At this time, the angle of the extension member 51 relative to the first angle change member 160 is changed depending on the other fastening location.

[0044] For example, when the other fastening location is the second positioning hole 154, the second positioning hole 154 is overlapped on the left and right with the first positioning hole 166, as shown in Fig. 8, and the extension member 51 is fixed at an angle extending in the same direction as the first angle change member 160. When the other fastening location is the second positioning hole 152 and is fastened together with the first positioning hole 162, the second positioning hole 152 is overlapped on the left and right with the first positioning hole 162, and the extension member 51 is fixed at an angle where the tip side faces upward relative to the first angle change member 160, as shown in Fig. 9.

[0045] As described above, in the fourth embodiment, extension member 51 is configured so that its angle in a side view can be changed, and the height of pushing members 53, 253, 353 is changed in accordance with the change in the angle of extension member 51. Therefore, the height of pushing members 53, 253, 353 can be changed to match the height of the crops in each field, for example, making it easier to efficiently harvest crops of various heights.

[0046] (Embodiment 5) 10 is a left side view of the front portion of extension member 51 according to embodiment 5. Unlike embodiment 1, extension member 51 is attached so that its angle can be changed, and in embodiment 5, a pushing-down member 253 similar to that in embodiment 2 is attached to extension member 51. Therefore, when the angle of extension member 51 is changed, the ground angle of pushing-down member 253, which is attached to the front of extension member 51 and has a concave shape toward the rear, is also changed. In embodiment 5, pushing-down member 253 is attached to extension member 51 via second angle change member 170.

[0047] Second angle change member 170 is a plate-shaped member and includes fixing holes 171 and 172 and third positioning holes 173 and 174. Fixing holes 171 and 172 and third positioning holes 173 and 174 are holes that penetrate second angle change member 170 from side to side.

[0048] As shown in FIG. 10, the second angle change member 170 is attached to the extension member 51 by fastening the fixing holes 171, 172 together with the two fixing holes 51a of the extension member 51 with bolts and nuts or the like.

[0049] In the fifth embodiment, the pushing-down member 253 is fixed to the second angle change member 170 by fastening two points of the fixing portion 54 to the second angle change member 170. One of the two fastening points of the fixing portion 54 of the pushing-down member 253 is fastened to the fixing hole 171. The other fastening point of the fixing portion 54 is fastened to either the fixing hole 172 or one of the third positioning holes 173 and 174. At this time, the angle of the pushing-down member 253 relative to the extension member 51 in a side view is changed depending on where the other fastening point is fastened.

[0050] 10, when the other fastening point of the fixing portion 54 is fastened to the fixing hole 172, the main body 255 of the pushing-down member 253 extends in the same direction as the extension member 51 in a side view, and the central portion 255a is located at the same height as the extension member 51. Furthermore, when the other fastening point of the fixing portion 54 is fastened to the third positioning hole 174, as shown by the imaginary line in FIG. 10, the main body 255 of the pushing-down member 253 is inclined downward and rearward from the extension member 51 in a side view, and the central portion 255a is located lower than the extension member 51.

[0051] As described above, in the fifth embodiment, the angle of the pushing member 253 relative to the extension member 51 can be changed, and the position of the central portion 255a changes in accordance with the change in angle. Therefore, for example, when the angle of the extension member 51 is significantly moved up or down to accommodate the height of the crop, the pushing member 253 can change the angle at which it contacts the crop depending on the state of the crop, making it easier to push the crop down at an appropriate height.

[0052] (effect) In this embodiment, when the pushing member 253 is concave toward the rear as in embodiment 5, the extension member 51 is configured to be able to change the height of the pushing member 253, so that the angle at which the pushing member 253 contacts the crop to be harvested can be appropriately changed depending on the height of the crop to be harvested and the condition of the stems and leaves, making it easier to efficiently harvest crops of various heights.

[0053] Furthermore, as in this embodiment, if the extension member 51 is configured so that the angle when viewed from the side can be changed, it will be possible to push down the crops to be harvested at an appropriate angle depending on their height, making it easier to efficiently harvest crops of various heights.

[0054] Furthermore, as in this embodiment, the pushing-down member 253 may be configured so that the angle thereof relative to the extending member 51 in a side view can be changed. This allows crops of various heights to be pushed down at the appropriate height, making it easier to harvest efficiently.

[0055] (Other embodiments) In the above embodiment, an example in which the harvester of the present invention is applied to a combine harvester 1 has been described, but this is merely one example. For example, the harvester of the present invention may be a single-function harvester that only harvests crops, without having functions such as threshing, sorting, and grain storage. Furthermore, the configuration of the harvester of the present invention may be applied to agricultural machinery other than a combine harvester, such as a binder.

[0056] In the above embodiment, the pair of left and right extension members 51 and the pushing members 53, 253, 353 are each separately detachable members, but the configuration of the crop pushing structure 50 is not limited to this. The crop pushing structure 50 may be integrally molded, or may be composed of the pair of left and right extension members 51 and the pushing members 53, 253, 353 that are integrated by welding or the like.

[0057] In the second embodiment, it has been described that central portion 255a is recessed rearward by substantially the entire main body portion 255 being curved in an arc shape, but this is merely an example. Main body portion 255 of the pushing-down member may have any shape as long as the center in the left-right direction is recessed rearward. For example, central portion 255a may be configured to be recessed rearward by substantially the entire main body portion 255 being bent in a V-shape.

[0058] In the second embodiment, the central portion 255a is formed in a shape concave toward the rear by curving almost the entire main body portion 255 in an arc shape, but as shown in FIG. 6, the main body portion 355 may be formed in a shape concave toward the rear in a trapezoidal shape, or in a polygonal shape other than a trapezoidal shape.

[0059] In the third embodiment, the rotor 455 is described as being provided over substantially the entire main body 55, which extends linearly in the left-right direction. However, this is merely an example. FIG. 11 is a perspective view of the reaping unit 30 according to a modification of the third embodiment. In this modification, the rotor 455, similar to that of the third embodiment, is provided on a linear portion of the central portion 355a of the main body 355 according to the modification of the second embodiment. Alternatively, the rotor 455 may be provided on the diagonal portion 355b connecting the central portion 355a of the main body 355 to the extension member 51. In this manner, the rotor 455 can be provided on any linear portion of the main body 55, 255, 355 of the pushing member 53, 253, 353. Alternatively, a protective member may be attached to the diagonal portion 355b to prevent the harvested crop from being pinched by the edge of the rotor 455 provided on the linear portion of the main body 355.

[0060] In the above embodiment, the extension member 51 is attached to the arm member 39 that supports the raking reel 37. That is, the crop pushing structure 50 is configured to move up and down together with the raking reel 37, but this is just one example. For example, the extension member 51 may be attached directly or indirectly to the platform 33 instead of the arm member 39, and the crop pushing structure 50 may not move up and down together with the raking reel 37.

[0061] In the fourth embodiment, the height of the pushing-down member 53 can be changed by changing the angle of the extension member 51 with respect to the horizontal plane, but this is just one example. For example, the extension member 51 may be attached to a mounting pillar extending upward from the platform 33 or the arm member 39 at a selectable height. In this way, the height of the extension member 51 may be changed, thereby changing the height of the pushing-down member 53. Alternatively, any structure may be used to change the height of the pushing-down member 53.

[0062] In the fifth embodiment, the pushing member 253 of the second embodiment is attached so that its angle relative to the extension member 51 can be changed, but this does not limit the combination with the fourth embodiment. By changing the angle of the extension member 51 and also the angle of the pushing member 253, for example, if the crop to be harvested is spreading from near the roots to the adjacent row, the angle of the extension member 51 can be changed so that it faces the ground, and the spreading crop to be harvested can be moved between the pair of extension members 51. Also, by changing the angle of the pushing member 253 upward, it is possible to harvest the crop without knocking it down more than necessary. If long-stemmed crops such as Japanese millet are knocked down too much, they can break and become impossible to harvest. This allows the way the crop is knocked down to be adjusted, making it easier to efficiently harvest a variety of grains. [Explanation of symbols]

[0063] 1 Combine (harvesting machine) 31 mower blade 37 Sweeping reel 50 Crop pushing structure 51 Extension member (extension portion) 53 Push-down member (pushing down part) 55 Main body 55a central section 253 Push-down member (pushing down part) 255 Main body 255a central part 353 Push-down member (pushing down part) 355 Main body 355a central part 455 Rotating Body

Claims

1. A harvester having a cutting blade for cutting crops and a raking reel for raking the crops, A pair of left and right extension portions extending forward; a pushing-down section that is provided across the pair of extension sections and positioned forward of the cutting blade and the raking reel.

2. The pushing-down portion has a shape in which a central portion in the left-right direction is recessed toward the rear. The harvester of claim 1.

3. The pushing-down unit has a rotating body on the outer periphery of the main body. The harvester of claim 1.

4. The pushing-down unit has a rotating body on the outer periphery of the central part. The harvester of claim 2.

5. The extension section is configured to be able to change the angle of the pushing-down section.

3. The harvester of claim 2.

6. The extension portion is configured to be able to change its angle in a side view. The harvester of claim 1.

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