Harvesting Machine

Abstract

To provide a harvester capable of easily and efficiently harvesting long-culm miscellaneous grains. [Solution] A harvester equipped with a cutting blade 31 for cutting crops and a raking reel 37 for raking in the crops, the harvester also comprising a pair of left and right extension parts 51 extending forward, and a push-down part 53 that is provided across the pair of extension parts 51 and positioned forward of the cutting blade 31 and the raking reel 37.

Description

[Technical field]

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

[0002] Patent Document 1 discloses a normal type combine harvester that rakes in culms to harvest. The culm rake-in device of this normal type combine harvester is equipped with a sensor arm at the front end of one of the support arms that supports the culm rake-in reel, and the sensor arm is equipped with three culm length sensors arranged vertically. The support arm is then swung so that only the top culm length sensor does not detect culms, and the culm rake-in reel is raised and lowered to an appropriate rake-in position, thereby performing the rake-in action accurately. Patent Document 2 discloses a normal type combine harvester that harvests standing crops while raking them in. This normal type combine harvester is equipped with a divider having a vertical wall and a guide plate, and the crop to be harvested is divided by the divider and the vertical wall and guided to the inside of the guide plate for cutting and harvesting. Patent Document 3 discloses a riding grass mower equipped with a front bumper. This riding grass mower uses a grass stem pushing edge of the front bumper to push down the grass stems into a certain position and align them, making it easier to cut. Patent Document 4 discloses a crop harvesting mechanism equipped with a tilting bar. In this crop harvesting mechanism, the tilting bar is provided behind and above the tip of the blade, so that the crop that has been cut by the blade and comes into contact with the tilting bar is transported from the base side. [Prior art documents] [Patent documents]

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

[0004] [Patent Document 2] JP 2019-198304 A

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

[0006] [Patent Document 4] JP 2017-163868 A Summary of the Invention [Problem to be solved by the invention]

[0007] Demand for miscellaneous grains, oilseed crops, and other grains has increased in recent years due to the health consciousness, and expectations are high for them as crops for regional development due to their high selling prices and suitability for cultivation in mountainous and hilly areas. However, many of these miscellaneous grains are prone to grain fall due to contact of the raking reel with the ears. In Patent Document 1, the culm raking reel, together with the culm length sensor, is raised and lowered to a height near the ears of the crop, thereby ensuring that the raking is performed at an appropriate raking position, but it is not possible to prevent the culm 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 miscellaneous grains are harvested using a normal type combine harvester as in Patent Documents 1 and 2, there is a concern that the ears will be hit by the rotating raking reel, causing grain shedding, and the grains will fall in front of the platform, resulting in a significant grain loss. In addition, the miscellaneous grains include crops with long stems of over 2m, such as hawk millet. Such long-culm crops are prone to becoming entangled with adjacent crops and various parts of the harvester due to the falling of the stems by strong winds and the spreading of the ears and leaves by their own weight. For this reason, when harvesting miscellaneous grains using a normal type combine harvester such as those in Patent Documents 1 and 2, there is a concern that the crops will become entangled with the reel or reel tines, etc., and the work efficiency will decrease. In addition, when harvesting long-culm crops with a normal normal type combine harvester, the height of the cutting blade installed at the tip of the platform is set to a high position above the ground, and a cutting method called high cutting is performed with the cutting blade, and the raking reel is also set to an even higher position to rake the long-culm crops into the platform auger. At this time, depending on the long-culm crop, the cut culms may be higher than the set upper limit height of the raking reel, and the raking reel may not be able to rake in the cut crops, and they may continue to pile up above the platform auger, making it impossible to harvest. On the other hand, Patent Document 3 discloses a grass stem pushing edge that pushes down the grass stems into a certain position and aligns them. Patent Document 3 is a document about a grass mower, and the long grass stems pushed down by the grass stem pushing edge are cut by a rotating plate installed in the abdomen of the vehicle, but since it is intended for mowing only, it does not take into consideration the loss of grains at all like a harvester. In addition, since the grass stem pushing edge has a linear shape extending in the left and right directions, 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, and there is no effect of eliminating entanglement with adjacent crops. In addition, the tilting bar in Patent Document 4 is for transporting the crops from the base side after harvesting, and is located behind the tip of the cutting blade, which makes it less effective in preventing the crops from getting tangled before harvesting. As such, it is difficult to efficiently harvest long-culm millet using conventional harvesters such as normal combine harvesters, and so there has been a demand for a harvester that can efficiently harvest long-culm millet. [Means for solving the problem]

[0008] One aspect of the present invention is a harvester including a blade for cutting crops and a reel for raking the crops, the harvester including a pair of left and right extension parts extending forward, and a push-down part provided across the pair of extension parts and positioned forward of the blade and the reel. The push-down portion has a shape in which a central portion in the left-right direction is recessed toward the rear, It is a harvesting machine. Another aspect of the present invention is a harvester equipped with a cutting blade for cutting crops and a raking reel for raking the crops, the harvester comprising a pair of left and right extension parts extending forward, and a push-down part that is provided across the pair of extension parts and is positioned forward of the cutting blade and the raking reel, the pair of extension parts extending forward further than the position at which the push-down parts are positioned. Effect of the Invention

[0009] According to the harvester of the present invention, when harvesting long-culm miscellaneous grains as a crop, the culms of the crop, which have been freed from entanglement with adjacent crops by the extension members, are guided to the inside of the pair of extension members, guided to the pushing-down section that straddles the extension members, pushed down by the pushing-down members, and then cut by the cutting blade. This makes it difficult for the crop to become entangled with the various parts of the harvester, such as the raking reel, and prevents a decrease in work efficiency. In addition, by pushing the crop forward with the pushing-down section, the raking reel is less likely to come into contact with the ears of the crop, and grain loss can be reduced. This makes it easier to harvest long-culm miscellaneous grains efficiently. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a left side view of the harvester according to the first embodiment. [Diagram 2] FIG. 2 is a perspective view of a reaping unit according to the first embodiment. [Diagram 3] FIG. 2 is a left side view of the reaping unit according to the first embodiment. [Figure 4] FIG. 11 is a perspective view of a reaping unit according to a second embodiment. [Diagram 5] FIG. 11 is a plan view of a reaping unit according to a second embodiment. [Figure 6] FIG. 11 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. 13 is a left side view of the rear part of the extension member according to the fourth embodiment. [Figure 9] FIG. 13 is a left side view of the rear part of the extension member with the angle 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 embodiment 5. [Figure 11] FIG. 13 is a perspective view of a reaping unit according to a modified example of the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 figure, 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, which will be described later, is provided with respect 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 provided under the body 10 and support the body 10, a feeder 17 that is provided in front of the body 10 and transports the cut crops toward the body 10, and a reaping unit 30 that is provided 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 "harvest machine" in the present invention.

[0013] The machine body 10 incorporates a threshing and sorting section that threshes and sorts the harvested crops to produce grains, as well as a grain tank for storing the grains. The grains stored in the grain tank are discharged to the outside by a discharge auger 13 provided on the top of the machine body 10. A driving operation unit 15 for a driver to sit on is provided at the front of the machine body 10. The driving operation unit 15 is provided with levers, switches, etc. for steering the combine harvester 1 and performing various operations.

[0014] A feeder 17 extending forward is provided at the front end of the machine body 10. The feeder 17 transports the harvested crops to the threshing and sorting section. The machine body 10 also includes an internal combustion engine, a generator, a battery, or the like for supplying power or 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 that 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 reciprocates left and right 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 rotatably driven. The platform auger 34 is rotatably driven to transport the crops received by the platform 33 toward the feeder 17. That is, 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 on 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 at approximately the height of the cutting blade 31 above the ground from the adjacent crops in the ridge next to the ridge to be harvested, and guide them 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 portion 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 the upper part of the rear end of the platform 33. The arm members 39 are configured to be able to swing up and down around the rear end as an axis. The pair of arm members 39 swing by the extension and contraction of a reel cylinder 38 connecting the left arm member 39 and 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, a belt, and the like for rotating the take-in reel 37 (see FIG. 1). Furthermore, each arm member 39 is provided with a fastening portion 39a having a screw hole for fastening an extension member 51 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 disposed outboard of the take-in reel 37 in the left-right direction. The extension members 51 also extend forward of the push-down members 53 that are disposed in front of the take-in reel 37. A rod-shaped reinforcing member 52 that extends left and right is hung between the mid-portions 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 parts 54 fixed to the extending member 51, and a main body part 55 connecting the pair of fixing parts 54. The fixing parts 54 are plate-shaped and are fixed to the extending member 51 by fastening them with bolts or the like. Note that the extending member 51 has a large number of fixing holes 51a, and the position of the pushing-down member 53 in the front-rear direction can be changed by changing the fixing holes 51a to which the fixing parts 54 are fastened. In FIG. 2, the main body part 55 is a rectangular pipe with a square cross section, but it may be a pipe with a circular cross section, and the cross-sectional shape is not limited. In addition, for example, in the case of a circular cross section, the diameter of the cross section is not limited.

[0025] (operation) Next, the operation of the above-mentioned combine harvester 1 when harvesting crops will be described. In the following, the case where the combine harvester 1 harvests the cereal millet will be described. In addition, the description of the direction such as forward in the following description means a direction based on the combine harvester 1.

[0026] The combine harvester 1 harvests the hawk millet while moving forward along the ridges. At this time, the extension member 51 located at the front of the combine harvester 1 is inserted between the hawk millet planted in the ridge to be harvested and the hawk millet planted in the ridge next to the ridge to be harvested as the combine harvester 1 moves forward. The hawk millet is a long crop that grows to a height of about 1.5 to 2.5 m, and because of its long height, the culms tend to fall or break and become entangled with the hawk millet in the adjacent row. In this embodiment, apart from the divider 35 that divides the grass at a height approximately equal to the height of the cutting blade above ground, the extension member 51 at a height near the height of the raking reel 37 above ground makes it easy to eliminate the entanglement between the hawk millet in the ridge to be harvested and the hawk millet in the adjacent row, and makes it easy to guide only the hawk millet in the ridge to be harvested between the pair of extension members 51.

[0027] As the combine harvester 1 advances, the main body 55 of the pushing member 53 comes into contact with the culm of the Takasugu millet guided between the pair of extension members 51. When the combine harvester 1 advances with the main body 55 in contact with the culm of the Takasugu millet, the part of the Takasugu millet above the root is pushed forward, so that the tip side with the ear is pushed forward. As a result, the Takasugu millet falls toward the Takasugu millet further forward. In this state, the ear of the Takasugu millet falls in a direction away from the raking reel 37 located behind the pushing member 53.

[0028] When the combine 1 advances further with the hawk millet pushed down forward, the cutting blade 31 reaches the stalk of the hawk millet and the hawk millet is cut. At this time, the cut hawk millet leans against the uncut hawk millet in front of it and is supported by it, reducing the risk of it falling onto the field. The cut hawk millet is then transported to the rear platform 33 with the ears facing forward as the raking reel 37 rakes in the leaves and culms from the cutting section. In this way, by cutting the hawk millet while pushing it down forward with the push-down member 53, the hawk millet can be harvested while preventing the ears of the hawk millet 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 push-down member 53 that is arranged across the pair of extension members 51 and positioned forward of the cutting blade 31 and the raking reel 37. As a result, when harvesting long-culm cereals, the crop that has been freed from entanglement with the adjacent crop by the extension member 51 can be guided into a space surrounded by the pair of extension members 51 and the pushing member 53, and then can be cut by the cutting blade 31 in a state where it is pushed down by the pushing member 53. This prevents the harvested crop from piling up above the platform auger 34, thereby preventing a decrease in work efficiency. In addition, by pushing the crop forward with the pushing member 53, it becomes difficult for the raking reel 37 to come into contact with the ears of the crop before it is raked into the platform 33, thereby preventing grain loss. This makes it easier to harvest long-culm cereals 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 in a shape in which a central portion 255a in the left-right direction is recessed toward the rear. In FIG. 4, the central portion 255a is recessed toward the rear by curving almost the entire main body 255 in an arc shape.

[0031] (operation) In the second embodiment, only the pushing member 253 in the crop pushing structure 50 is different from the first embodiment. As the combine 1 advances, the extension member 51 disentangles the hawk millet entangled with the adjacent crop, but since the central part 255a of the pushing member 253 is shaped to be concave toward the rear, the hawk millet pushed down by the main body part 255 is gathered in the central part 255a while the ears at the tip fall in a direction facing the center in the left-right direction. Also, the hawk millet that has not been completely disentangled from the adjacent crop by the extension member 51 is actively disentangled by moving it toward the center, and then the hawk millet is pushed down by the pushing member 253 and cut by the cutting blade. The cut hawk millet is sent from the cutting part to the platform auger 34. This makes it easier for long-culm 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 down and cut is sent sequentially from the cutting section to the platform auger 34, preventing the sorghum from becoming entangled with various parts 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 harvest target crop toward the center, so that when the harvested sorghum that is close to the extension member 51 is raked into the platform auger 34, the tip of the sorghum is caught between the platform side cover 32 and the raking reel 37, and it may not be raked into the platform auger 34. According to the second embodiment, the harvested sorghum is raked toward the center, so that the sorghum is raked into the platform auger 34 without being 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 so 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 harvest target crop with adjacent rows. In addition, it is possible to prevent the harvest target crop from being pinched between the platform side cover 32 and the raking reel 37 after reaping. The second embodiment makes it easier to efficiently harvest long-culm miscellaneous grains.

[0034] (Modification) FIG. 6 is a perspective view of the reaping unit 30 according to a modified example of the second embodiment. As shown in FIG. 6, in the modified example of the second embodiment, the main body 355 of the pushing member 353 provided across a pair of right and left extension members 51 is bent into a trapezoidal shape, unlike the main body 255 of the second embodiment, which is curved in a substantially arc shape as a whole. The main body 355 has a trapezoidal bent shape, and thus has a linear central portion 355a parallel to the left and right direction. The main body 355 also has a linear inclined portion 355b connecting the extension member 51 and the central portion 355a. The inclined portions 355b are provided in a pair on the left and right, and are inclined backward from the connection portion with the extension member 51 toward the central portion 355a.

[0035] In this manner, 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 the third embodiment. In the third embodiment, the crop pushing structure 50 is provided in the same manner as in the first embodiment. In the first embodiment, the pushing member 53 is fixed in a state of straddling between a pair of extension members 51 of the crop pushing structure 50, and the harvest target crop is pushed down by the pushing member 53 and then cut by the cutting blade 31. However, in the case of easily threshed grains, such as perilla, when the crop comes into contact with the pushing member 53, the grains may be threshed due to frictional resistance between the pushing member 53 and the main body 55 of the pushing member 53, which may increase losses. As shown in FIG. 7, in the third embodiment, a rotatable rotor 455 is installed on the outer periphery of the main body 55, and the rotor 455 reduces frictional resistance by rotating when it comes into contact with the harvest target crop. In detail, 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 crop guided between a pair of extension members 51 comes into contact with a rotating body 455 installed on the pushing member 53, and the rotating body 455 rotates according to the state of the harvested crop being pulled into the platform 33, allowing the crop to be raked in with low contact resistance.

[0038] (effect) As in this embodiment, the pushing-down member 53 may be configured to include 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 raked into 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 shedding of grains of the crop to be harvested, making it easier to efficiently harvest long-stalked miscellaneous grains.

[0039] (Embodiment 4) 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 with the angle 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, extension member 51 in embodiment 4 is provided with second shaft hole 151 and second positioning holes 152, 153, and 154. Second shaft hole 151 and each of second positioning holes 152 to 154 are holes that penetrate 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 of the extension member 51 is the second shaft hole 151, and is fastened together with the first shaft hole 161 by a bolt, nut, or the like. The other of the two fastening locations of the extension member 51 is any one of the second positioning holes 152-154, and is fastened together with the first positioning holes 162-166 by 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 point 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 point 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] Thus, in the fourth embodiment, the angle of the extension member 51 in a side view is changeable, and the height of the pushing members 53, 253, 353 is changed in accordance with the change in the angle of the extension member 51. Therefore, for example, the height of the pushing members 53, 253, 353 can be changed in accordance with the grass height of the crops in each field, making it easier to efficiently harvest crops of various grass heights.

[0046] (Embodiment 5) 10 is a left side view of the front part of the extension member 51 according to the fifth embodiment. In the fifth embodiment, unlike the first embodiment, the angle of the extension member 51 is changeable, and in the fifth embodiment, the pushing-down member 253 similar to that in the second embodiment is attached to the extension member 51. Therefore, when the angle of the extension member 51 is changed, the ground angle of the pushing-down member 253, which is attached to the front of the extension member 51 and has a concave shape toward the rear, is also changed. In the fifth embodiment, the pushing-down member 253 is attached to the extension member 51 via the 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 left to right.

[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 the third positioning holes 173 and 174. At this time, the angle of the pushing-down member 253 in a side view relative to the extension member 51 is changed depending on the fastening destination of the other fastening point.

[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. Also, 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 rearward and downward from the extension member 51 in a side view, and the central portion 255a is located lower than the extension member 51.

[0051] Thus, in the fifth embodiment, the angle of the pushing down member 253 relative to the extension member 51 can be changed, and the position of the central portion 255a changes 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 down member 253 can change the angle at which it contacts the crop depending on the state of the crop, making it easier to push down the crop 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 becomes possible to push down the crop to be harvested at an appropriate angle depending on the height of the crop, making it easier to efficiently harvest crops of various heights.

[0054] Also, like in this embodiment, the pushing down member 253 may be configured so that the angle thereof with respect 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 the 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 does not have the functions of threshing, sorting, and storing grains, and only harvests crops. 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 integrated by welding or the like.

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

[0058] In the second embodiment, central portion 255a has a shape that is concave toward the rear due to almost the entire main body portion 255 being curved in an arc shape, but as shown in FIG. 6, main body portion 355 may be configured to have a trapezoidal shape that is concave toward the rear, or may have a polygonal shape other than a trapezoid that is concave toward the rear.

[0059] In the third embodiment, the rotating body 455 is described as being provided over substantially the entire body 55 extending linearly in the left-right direction, but this is only one example. FIG. 11 is a perspective view of the reaping unit 30 according to a modification of the third embodiment. In this modification, the rotating body 455 similar to that of the third embodiment is provided in the straight portion of the center portion 355a of the body 355 in the modification of the second embodiment. The rotating body 455 may also be provided in the diagonal portion 355b connecting the center portion 355a of the body 355 and the extension member 51. In this way, the rotating body 455 can be provided in any straight portion of the body 55, 255, 355 of the pushing member 53, 253, 353. In addition, a protective member for preventing the harvested crop from being pinched by the end of the rotating body 455 provided in the straight portion of the body 355 may be attached to the diagonal portion 355b.

[0060] In the above embodiment, the extension member 51 is attached to the arm member 39 that supports the shoveling reel 37. In other words, the crop pushing structure 50 is configured to move up and down together with the shoveling 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 to the arm member 39, and the crop pushing structure 50 may not move up and down together with the shoveling reel 37.

[0061] In the fourth embodiment, the height of the push-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 number of heights. In this way, the height of the extension member 51 may be made variable, thereby changing the height of the push-down member 53. Alternatively, any structure may be used to change the height of the push-down member 53.

[0062] In the fifth embodiment, the pushing member 253 of the second embodiment is attached so that the 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, when the harvest target crop spreads from the root area to the adjacent row, the angle of the extension member 51 is changed toward the ground side, the spreading harvest target crop is brought between the pair of extension members 51, and the angle of the pushing member 253 is changed upward, so that the harvest target crop can be harvested without being knocked down more than necessary. If long-culm crops such as Takakibi are knocked down too much, they may break and become impossible to harvest, but this allows the way in which the crop is knocked down to be adjusted, making it easier to efficiently harvest various miscellaneous 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 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 a crop and a raking reel for raking the crop, A pair of left and right extension portions extending forward; a push-down portion that is provided across the pair of extension portions and is disposed forward of the cutting blade and the raking reel, The push-down portion has a shape in which a central portion in the left-right direction is recessed toward the rear.

2. The pushing-down unit is provided with a rotating body on the outer periphery of the central portion.

2. The harvester of claim 1.

3. The extension unit is configured to be able to change the angle of the pushing-down unit.

2. A harvester as claimed in claim 1.

4. The extension portion is configured to be able to change the angle in a side view.

2. A harvester as claimed in claim 1.

5. 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 push-down portion that is provided across the pair of extension portions and is disposed forward of the cutting blade and the raking reel, The pair of extension portions extend forward of a position where the pushing-down portion is disposed.

6. The pushing-down unit is provided with a rotating body on the outer periphery of the main body. A harvester as claimed in claim 5.

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