Combine harvester

Abstract

A combine harvester is desired to avoid the hooked contact of the ear side portion of the cut grain stalk in the conveyance by the ear conveyance device. The combine harvester is provided with an ear conveyance device (3) that conveys the ear side portion of the cut grain stalk toward a threshing device (6). The ear conveyance device (33) has a ring-shaped rotating chain (36) and a guide member (40) that guides the cut grain stalk toward the ring-shaped rotating chain side (36). The combine harvester is provided with a support frame (45) that supports the guide member (40). The support frame (45) extends toward the guide member (40) from the side opposite to the ring-shaped rotating chain (36) with respect to the guide member (40) in a direction intersecting the conveyance direction of the ear conveyance device (33) in a plan view. The combine harvester is provided with an avoidance mechanism (M) for avoiding the contact of the cut grain stalk in the conveyance by the ear conveyance device (33) with the support frame (45).

Description

TECHNICAL FIELD

[0001] The present application relates to a combine harvester. BACKGROUND

[0002] In the past, as a combine harvester, there is known, for example, the combine harvester described in Patent Literature 1. In the combine harvester described in Patent Literature 1, there is provided a threshing device (in the document, "threshing device [4]") that performs a threshing process on a cut grain plant, and a spike tip conveying device (in the document, "spike tip locking conveying section

[34] ") that conveys a spike tip side portion of the cut grain plant toward the threshing device. In the spike tip conveying device, there are provided: a ring-shaped rotating chain (in the document, "ring-shaped rotating chain [34a]"); a plurality of claws (in the document, "locking conveying claws [34b]") that are installed on the ring-shaped rotating chain and lock to the spike tip side portion of the cut grain plant; and a guide member (in the document, "spike tip conveying guide

[35] , locking conveying guide rail

[41] ") that guides the cut grain plant toward the ring-shaped rotating chain side. In the combine harvester described in Patent Literature 1, there is provided a support frame (in the document, "front end side portion (45e)") that supports the guide member.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2002-360040 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In the combine harvester described in Patent Literature 1, the spike tip side portion of the cut grain plant in the conveying by the spike tip conveying device sometimes gets hooked on the support frame. Moreover, if the spike tip side portion of the cut grain plant in the conveying by the spike tip conveying device gets hooked on the support frame, there is a concern that the grain is lost.

[0008] In view of the above circumstances, a combine harvester in which the spike tip side portion of the cut grain plant in the conveying by the spike tip conveying device is less likely to get hooked on the support frame is desired.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The present application is characterized by a combine harvester including: a threshing device that performs a threshing process on cut stalks; and an ear tip conveying device that conveys an ear tip side portion of the cut stalks toward the threshing device, the ear tip conveying device including: a ring-shaped rotating chain; a plurality of claws that are attached to the ring-shaped rotating chain and that are engaged with the ear tip side portion of the cut stalks; and a guide member that guides the cut stalks toward the ring-shaped rotating chain, the combine harvester including a support frame that supports the guide member, the support frame extending from a side opposite the ring-shaped rotating chain toward the guide member in a direction intersecting a conveying direction of the ear tip conveying device when viewed from above, and including an avoidance mechanism for avoiding contact between the cut stalks in the conveying by the ear tip conveying device and the support frame.

[0011] According to the present feature, even if the ear tip side portion of the cut stalks in the conveying by the ear tip conveying device extends outward from between the ring-shaped rotating chain and the guide member, the ear tip side portion of the cut stalks passes through the space formed by the curved portion. Thus, even if the ear tip side portion of the cut stalks in the conveying by the ear tip conveying device extends outward from between the ring-shaped rotating chain and the guide member, the ear tip side portion of the cut stalks is less likely to be hooked on the support frame.

[0012] Further, in the present application, it is preferable that, as the avoidance mechanism, a curved portion formed by the support frame meandering upward be provided.

[0013] According to the present feature, even if the ear tip side portion of the cut stalks in the conveying by the ear tip conveying device extends outward from between the ring-shaped rotating chain and the guide member, the ear tip side portion of the cut stalks passes through the space formed by the curved portion. Thus, even if the ear tip side portion of the cut stalks in the conveying by the ear tip conveying device extends outward from between the ring-shaped rotating chain and the guide member, the ear tip side portion of the cut stalks is less likely to be hooked on the support frame.

[0014] Further, in the present application, it is preferable that the curved portion include: a first longitudinal portion extending upward from the guide member; a transverse portion extending transversely from an upper end of the first longitudinal portion toward a side opposite the ring-shaped rotating chain; and a second longitudinal portion extending downward from an end of the transverse portion opposite the first longitudinal portion.

[0015] According to the present feature, the curved portion is formed in a substantially inverted U shape. Thus, the curved portion can be easily provided.

[0016] Further, in the present application, it is preferable that, as the avoidance mechanism, a longitudinal wall extending from the support frame along the guide member toward an upstream side of the conveying direction of the ear tip conveying device be provided.

[0017] According to this structural feature, the tip portion of the harvested rice stalk during transport by the tip conveyor is guided by the longitudinal wall. Therefore, the tip portion of the harvested rice stalk during transport by the tip conveyor is less likely to hook onto the support frame.

[0018] Furthermore, in this invention, it is preferred that the avoidance mechanism includes a longitudinal wall extending upstream of the support frame along the guide member toward the conveying direction of the ear tip conveying device, and the curved portion having: a first longitudinal portion extending upward from the guide member; a transverse portion extending laterally from the upper end of the first longitudinal portion toward the side opposite to the annular rotating chain; and a second longitudinal portion extending downward from the end of the transverse portion on the side opposite to the first longitudinal portion.

[0019] According to this structural feature, the curved portion is formed in a roughly inverted U-shape. This allows for a simple installation of the curved portion. Furthermore, the ear-tip side portion of the harvested stalk during transport by the ear-tip conveyor is guided by the longitudinal wall. This prevents the ear-tip side portion of the harvested stalk during transport from easily hooking onto the support frame.

[0020] Furthermore, in this invention, it is preferred that the upper lateral width of the curved portion has a width that is more than half the width of the lower lateral width.

[0021] According to this structural feature, the upper lateral width of the curved section is relatively wide. Therefore, even if a large amount of the ear-tip side portion of the harvested rice stalk passes through the space formed by the curved section, the ear-tip side portion of the harvested rice stalk is difficult to hook onto the support frame. Attached Figure Description

[0022] Figure 1 This is a left-side view of a combine harvester.

[0023] Figure 2 This is a top view showing the cutting section.

[0024] Figure 3 This is a perspective view showing the front of the conveying section and the threshing device.

[0025] Figure 4 This is a left-side view showing the front of the conveying section and the threshing device.

[0026] Figure 5 This is a front view showing the right ear tip conveying device and the threshing device.

[0027] Figure 6 This is a top view showing the front of the conveying section and the threshing device.

[0028] Figure 7 yes Figure 6Sectional view VII-VII in the figure.

[0029] Figure 8 yes Figure 6 Sectional view VIII-VIII in the middle.

[0030] Explanation of reference numerals in the attached figures

[0031] 6 Threshing device

[0032] 33. Right ear shoot conveying device (ear shoot conveying device)

[0033] 36. Right spikelet chain (ring-shaped rotating chain)

[0034] 37 claws

[0035] 40. Top spike guide (guide component)

[0036] 45 support frame

[0037] 46. ​​Right longitudinal section (first longitudinal part)

[0038] 47. Upper horizontal section (horizontal part)

[0039] 48. Left longitudinal section (second longitudinal section)

[0040] 50 bend

[0041] 51 longitudinal walls

[0042] M Avoidance Agency

[0043] The horizontal width of the upper side of W1

[0044] The horizontal width of the lower side of W2 Detailed Implementation

[0045] Based on the accompanying drawings, the embodiments for implementing the present invention will be described. It should be noted that, in the following description, the direction of arrow F is designated as "front side of the aircraft", the direction of arrow B is designated as "rear side of the aircraft", the direction of arrow L is designated as "left side of the aircraft", and the direction of arrow R is designated as "right side of the aircraft".

[0046] [Overall structure of a combine harvester]

[0047] exist Figure 1 The image shows a semi-feed combine harvester (equivalent to the "combine harvester" of this invention). For example... Figure 1 As shown, this combine harvester includes a traveling body 1. The traveling body 1 includes a tracked traveling device 2 and a frame 3 supported on the tracked traveling device 2. A cutting section 4 for cutting planted rice stalks is located at the front of the traveling body 1. A driver's cab 5 is located on the right side of the front part of the traveling body 1.

[0048] Behind the harvesting section 4, a threshing device 6 is provided to thresh the harvested rice stalks from the harvesting section 4. Adjacent to the right of the cab 6, a grain storage box 7 is provided to store the threshed grains. A grain discharge device 8 is connected to the grain storage box 7 to discharge the grains inside the grain storage box 7.

[0049] The threshing device 6 includes a threshing cylinder 10 that can rotate about a rotation axis Y1 extending in the front-rear direction of the machine body. The threshing cylinder 10 includes a generally cylindrical body portion 10A and a plurality of threshing teeth 10B installed on the outer periphery of the body portion 10A. A straw inlet 6A is formed on the front surface of the threshing device 6 for introducing cut straw from the cutting section 4.

[0050] A conveyor chain 9 is provided laterally (to the left) on the threshing device 6. The conveyor chain 9 is configured to clamp the stem-root side of the harvested rice stalk as it passes through the interior of the threshing device 6, and convey the harvested rice stalk towards the rear of the machine. By clamping the stem-root side of the harvested rice stalk as it passes through the interior of the threshing device 6 and conveying it towards the rear of the machine, the ear-root side of the harvested rice stalk is threshed inside the threshing device 6 via the threshing cylinder 10.

[0051] [Cut-off section]

[0052] like Figure 1 as well as Figure 2 As shown, the harvesting section 4 is configured for multi-stalk harvesting (in this embodiment, it is a seven-stalk harvesting section). The harvesting section 4 includes: multiple (eight in this embodiment) separating tools 12 for separating the planted rice stalks; multiple (seven in this embodiment) supporting devices 13 for supporting the planted rice stalks; multiple (seven in this embodiment) feeding belts 14 for feeding the stems and roots of the planted rice stalks; a cutting device 15 for cutting the planted rice stalks; multiple (seven in this embodiment) feeding presses 16 for feeding the stems and roots of the harvested rice stalks; and a conveying section 17 for conveying the harvested rice stalks toward the rear of the machine body.

[0053] According to this structure, the planted rice stalks in the field are divided by the dividing tool 12, and then the divided rice stalks are supported by the supporting device 13. The supported rice stalks are then pushed in by the feeding belt 14, and cut by the cutting device 15. The cut rice stalks are then pushed in by the pressing device 16, and conveyed towards the rear of the machine by the conveying unit 17.

[0054] [Transportation Department]

[0055] like Figure 2 As shown, the conveying unit 17 includes a left conveying device 18, a middle conveying device 19, a right conveying device 20, a threshing depth conveying device 21, a supply conveying device 22, and an auxiliary conveying device 23.

[0056] The left conveying device 18 is configured to convey the leftmost two of the seven stalks of harvested rice stalks. The left conveying device 18 includes a left stem root conveying device 24 that clamps and conveys the stem root side portion of the harvested rice stalks and a left ear tip conveying device 25 that stops and conveys the ear tip side portion of the harvested rice stalks.

[0057] The central conveyor 19 is configured to convey the harvested stalks of the three central stalks out of the seven stalks. The central conveyor 19 includes a central left conveyor 26 and a central right conveyor 27.

[0058] The left-middle conveying device 26 is configured to convey the leftmost of the three central stalks of harvested rice stalks. The left-middle conveying device 26 includes a left-middle stem root conveying device 28 for clamping and conveying the stem root side portion of the harvested rice stalk, and a left-middle ear tip conveying device 29 for locking and conveying the ear tip side portion of the harvested rice stalk.

[0059] The middle-right conveying device 27 is configured to convey the right two of the three central stalks of harvested rice stalks. The middle-right conveying device 27 includes a middle-right stem-root conveying device 30 that clamps and conveys the stem-root side portion of the harvested rice stalks and a middle-right ear-tip conveying device 31 that stops and conveys the ear-tip side portion of the harvested rice stalks.

[0060] The right conveying device 20 is configured to convey the harvested rice stalks of the two rightmost plants out of the seven plants. The right conveying device 20 includes a right stem root conveying device 32 for clamping and conveying the stem root side portion of the harvested rice stalks and a right ear tip conveying device 33 for blocking and conveying the ear tip side portion of the harvested rice stalks (equivalent to the "ear tip conveying device" of the present invention).

[0061] The threshing depth conveying device 21 is configured to clamp and convey the stalk and root side portion of the harvested rice stalk from the left stalk and root conveying device 24, the middle left stalk and root conveying device 28, the middle right stalk and root conveying device 30, and the right stalk and root conveying device 32. The threshing depth conveying device 21 is configured to swing up and down at its front pivot point. By swinging the threshing depth conveying device 21 up and down, the threshing depth can be adjusted.

[0062] The supply conveying device 22 is configured to clamp and convey the stalk-root side portion of the harvested rice straw, which is received from the threshing depth conveying device 21. The supply conveying device 22 includes a supply chain 34 and a supply guide 35, which is positioned opposite the supply chain 34 to guide the harvested rice straw towards the supply chain 34. A supply frame 43 is provided to support the supply guide 35 and the like. The auxiliary conveying device 23 is configured to clamp and convey the stalk-root side portion of the harvested rice straw, which is received from the supply conveying device 22.

[0063] According to this structure, the two-stalk cut rice stalks on the ear side, which are stopped and conveyed by the left ear tip conveying device 25, the one-stalk cut rice stalk on the ear side, which are stopped and conveyed by the middle left ear tip conveying device 29, the two-stalk cut rice stalks on the ear side, which are stopped and conveyed by the middle right ear tip conveying device 31, and the two-stalk cut rice stalks on the ear side, which are stopped and conveyed by the right ear tip conveying device 33, merge. The merged cut rice stalks on the ear side (the seven-stalk cut rice stalks on the ear side) are stopped and conveyed by the right ear tip conveying device 33 and introduced into the rice stalk inlet 6A of the threshing device 6.

[0064] Additionally, the stem-root portion of two stalks of harvested rice straw held and conveyed by the left stem-root conveyor 24, the stem-root portion of one stalk of harvested rice straw held and conveyed by the middle left stem-root conveyor 28, the stem-root portion of two stalks of harvested rice straw held and conveyed by the middle right stem-root conveyor 30, and the stem-root portion of two stalks of harvested rice straw held and conveyed by the right stem-root conveyor 32 merge. This merged stem-root portion of harvested rice straw (seven stalks of harvested rice straw) is held and conveyed by the threshing depth conveyor 21 and the supply conveyor 22. Then, the stem-root portion of harvested rice straw from the supply conveyor 22 is transferred to the conveyor chain 9 by the auxiliary conveyor 23.

[0065] [Right ear shoot conveying device]

[0066] like Figures 2 to 6 As shown, the right-hand shoot conveying device 33 includes: a right-hand shoot chain 36 (equivalent to the "ring rotating chain" of the present invention); multiple claws 37 mounted on the right-hand shoot chain 36 and engaged with the shoot-side portion of the harvested rice stalk; a right-hand shoot guide 38 that guides the harvested rice stalk toward the right-hand shoot chain 36; and a guide member 39 that forms a passage path Pr through which the shoot-side portion of the harvested rice stalk passes. The right-hand shoot guide 38 includes an upper shoot guide 40 (equivalent to the "guide member" of the present invention) that guides the upper part of the shoot-side portion of the harvested rice stalk, and a lower shoot guide 41 that guides the lower part of the shoot-side portion of the harvested rice stalk. Both the upper shoot guide 40 and the lower shoot guide 41 are composed of rod-shaped (round rod-shaped) components.

[0067] The front ends of the upper spikelet guide 40 and the lower spikelet guide 41 are respectively supported on the side of the left spikelet conveying device 25. A support portion 40a is formed at the front end of the upper spikelet guide 40, which supports the left spikelet conveying device 25. A support portion 41a is formed at the front end of the lower spikelet guide 41, which supports the left spikelet conveying device 25.

[0068] The lower spikelet guide 41 is supported on the support bar 44 via the lower support bar 42. The lower support bar 42 is supported on the supply frame 43 via the support bar 44.

[0069] [Support Frame]

[0070] like Figures 3 to 7 As shown, a support frame 45 is provided to support the upper ear tip guide 40. The upper ear tip guide 40 is supported on the support bar 44 via the support frame 45. The support frame 45 is supported on the supply frame 43 via the support bar 44. The support frame 45 and the lower support bar 42 are bolted together (jointly fastened) to the support bar 44.

[0071] When viewed from above, the support frame 45 extends relative to the upper spikelet guide 40 from the side opposite to the right spikelet chain 36 in a direction intersecting the conveying direction of the right spikelet conveying device 33. The support frame 45 includes a right longitudinal portion 46 (corresponding to the "first longitudinal portion" of the present invention), an upper transverse portion 47 (corresponding to the "transverse portion" of the present invention), a left longitudinal portion 48 (corresponding to the "second longitudinal portion" of the present invention), and a lower transverse portion 49.

[0072] In the support frame 45, a curved section 50 is formed by the right longitudinal section 46, the upper transverse section 47, and the left longitudinal section 48. That is, the curved section 50 is provided as an avoidance mechanism M to prevent the cut rice stalks during the conveying process of the right ear tip conveyor 33 from contacting the support frame 45. The curved section 50 is formed by the support frame 45 meandering upwards. In other words, the curved section 50 is formed in a roughly inverted U-shape.

[0073] The right longitudinal portion 46 extends upward from the upper spikelet guide portion 40. The upper transverse portion 47 extends laterally (to the left) from the upper end of the right longitudinal portion 46 toward the side opposite to the right spikelet chain 36.

[0074] The left longitudinal portion 48 extends downward from the end (left end) of the upper horizontal portion 47 opposite to the right longitudinal portion 46. The left longitudinal portion 48 is formed with a bend in its middle section. The left longitudinal portion 48 extends to a lower position than the right longitudinal portion 46. In the left longitudinal portion 48, an inclined portion 48a and a parallel portion 48b are provided sequentially from the top. The inclined portion 48a is formed with a shape that slopes downward and further away from the right longitudinal portion 46. The parallel portion 48b is formed parallel (or approximately parallel) to the right longitudinal portion 46.

[0075] The lower horizontal portion 49 extends laterally (to the left) from the lower end of the left vertical portion 48 toward the side opposite to the right spikelet chain 36. The lower horizontal portion 49 and the lower support bar 42 are bolted together (jointly fastened) to the support bar 44.

[0076] exist Figure 7In the curved section 50, W1 represents the upper lateral width, and W2 represents the lower lateral width. In the curved section 50, the upper lateral width W1 is narrower than the lower lateral width W2. Specifically, in the curved section 50, the upper lateral width W1 is narrower than the lower lateral width W2, and has a width that is more than half the width of the lower lateral width W2.

[0077] like Figure 7 As shown, the ear-tip side portion of the harvested rice stalks conveyed by the right ear-tip conveying device 33 typically passes between the right ear-tip guide 38 and the right ear-tip chain 36 (see reference). Figure 7 The top portion of the harvested rice stalk (S1) during the transport by the right top portion conveyor 33 extends outward from between the right top portion chain 36 and the upper top portion guide 40 (see reference). Figure 7 The tip portion S2 of the harvested rice stalk will pass through the space formed by the bend 50. Therefore, even if the tip portion of the harvested rice stalk extends outward from between the right tip chain 36 and the upper tip guide 40 during transport by the right tip conveyor, the tip portion S2 is unlikely to hook onto the support frame 45. Thus, the bend 50 functions as an avoidance device M.

[0078] [Vertical Wall]

[0079] like Figures 3 to 6 As shown, a longitudinal wall 51 is provided, which extends upstream from the support frame 45 along the upper ear guide 40 toward the conveying direction of the right ear conveyor 33. That is, the longitudinal wall 51 is provided as an avoidance mechanism M to prevent the cut rice stalks during conveying by the right ear conveyor 33 from contacting the support frame 45. The longitudinal wall 51 is formed in a shape that bends along the curved shape of the upper ear guide 40. The longitudinal wall 51 extends upstream from the support frame 45 to the vicinity of the front end (support portion 40a) of the upper ear guide 40 toward the conveying direction of the right ear conveyor 33.

[0080] In the longitudinal wall 51, starting from the downstream side in the conveying direction of the right ear tip conveying device 33, there are sequentially provided a first plate surface 51a, a second plate surface 51b, and a third plate surface 51c. The first plate surface 51a extends from the leading edge of the right longitudinal section 46 toward the upstream side in the conveying direction of the right ear tip conveying device 33. The second plate surface 51b extends from the leading edge of the first plate surface 51a toward the upstream side in the conveying direction of the right ear tip conveying device 33. The third plate surface 51c extends from the leading edge of the second plate surface 51b toward the upstream side in the conveying direction of the right ear tip conveying device 33.

[0081] [Grain stalk entrance]

[0082] like Figure 6as well as Figure 8 As shown, an inlet guide plate 55 for guiding the cutting of rice straw is provided at the straw inlet 6A of the threshing device 6. The inlet guide plate 55 is formed in a generally arc shape when viewed from the front, along the lower edge of the straw inlet 6A of the threshing device 6. At the right end of the inlet guide plate 55, a longitudinal guide plate 56 for guiding the front end of the ear tip side of the cutting rice straw is provided.

[0083] A rear guide plate 57 is mounted at the rear end of the guide member 39. The rear guide plate 57 is made of a flexible plate-like member (e.g., a rubber sheet). The rear guide plate 57 is disposed across the rear end of the guide member 39 and the inlet guide plate 55.

[0084] On the front surface of the threshing device 6, there is a display section D indicating indicator I. Indicator I is an indicator indicating the appropriate entry position of the front end of the ear of rice stalk in the rice stalk inlet 6A of the threshing device 6. Indicator I is an indicator used by the operator during manual threshing of the rice stalk.

[0085] exist Figure 8 In this diagram, 10a represents the lowest point of the cylinder section 10A, and A represents the rotation direction of the threshing cylinder 10 around the rotation axis Y1. Indicator I is positioned downstream of the rotation direction A of the threshing cylinder 10, further than the lowest point 10a of the cylinder section 10A. In other words, Indicator I is positioned closer to the ear tip of the harvested rice stalk than the lowest point 10a of the cylinder section 10A.

[0086] [Threshing Depth Control]

[0087] like Figure 4 as well as Figure 5 As shown, a shoot sensor 52 is provided above the rear part of the guide member 39 (specifically, the third guide member 60 described later). This shoot sensor 52 detects the shoot-side portion of the harvested rice stalk passing through the passage path Pr. The shoot sensor 52 includes a shoot-side sensor 52A at the stem root and a shoot-side sensor 52B at the shoot tip.

[0088] This combine harvester includes a control structure for adjusting the threshing depth of the threshing depth conveying device 21. This control structure includes a threshing depth motor 53 that drives the threshing depth conveying device 21 to swing up and down, and a threshing depth control device 54 that controls the threshing depth motor 53. The threshing depth control device 54 is configured to change the guide length of the ear-tip side of the harvested stalk relative to the stalk inlet 6A of the threshing device 6 based on the detection results of the ear-tip sensor 52. Specifically, the threshing depth control device 54 controls the threshing depth motor 53 in a manner that brings the front end of the ear-tip side of the harvested stalk close to index I.

[0089] Specifically, when both the stalk-root side spikelet sensor 52A and the spikelet sensor 52B detect the spikelet side portion of the harvested rice stalk, the threshing depth control device 54 drives the threshing depth motor 53 to swing the threshing depth conveying device 21 towards the shallow threshing side (swinging downwards). Conversely, when neither the stalk-root side spikelet sensor 52A nor the spikelet sensor 52B detects the spikelet side portion of the harvested rice stalk, the threshing depth control device 54 drives the threshing depth motor 53 to swing the threshing depth conveying device 21 towards the deep threshing side (swinging upwards). Furthermore, when the spikelet side spikelet sensor 52B does not detect the spikelet side portion of the harvested rice stalk, but the stalk-root side spikelet sensor 52A detects it, the threshing depth control device 54 does not drive the threshing depth motor 53 (does not swing the threshing depth conveying device 21).

[0090] [Guide Components]

[0091] like Figures 3 to 8 As shown, the guide member 39 comprises, sequentially upstream of the right ear tip conveying device 33, a first guide member 58, a second guide member 59, and a third guide member 60. The rear end of the first guide member 58 and the front end of the second guide member 59 are bolted together. The rear end of the second guide member 59 and the front end of the third guide member 60 are also bolted together.

[0092] The third guide component 60 includes a bottom part 61, a near-front longitudinal wall 62, and an inner longitudinal wall 63.

[0093] A curved portion 61a is formed at the front of the bottom portion 61. A mounting portion 61b for mounting the rear guide plate 57 is provided at the rear end of the bottom portion 61. It should be noted that, as... Figure 7 as well as Figure 8 As shown, "cutting the rice stalk from the top of the ear" is indicated by the arrow pointing to the "top of the ear" side, and "cutting the rice stalk from the root side" is indicated by the arrow pointing to the "root side".

[0094] The inner longitudinal wall 63 is located closer to the ear tip of the harvested rice stalk than the near-front longitudinal wall 62, and is erected at the end of the bottom surface 61 on the ear tip side of the harvested rice stalk. The inner longitudinal wall 63 extends in a straight line when viewed from above.

[0095] The anterior longitudinal wall 62 is located closer to the stem root side of the harvested rice stalk than the inner longitudinal wall 63, and is erected at the end of the bottom surface 61 on the ear tip side of the harvested rice stalk. The anterior longitudinal wall 62 is composed of a wall that is higher than the inner longitudinal wall 63 (higher from the bottom surface 61).

[0096] The front longitudinal wall 62 is configured to be detachable from the bottom surface 61. That is, the front longitudinal wall 62 is configured to be repositionable. The front longitudinal wall 62 is detachably mounted on one mounting position of the bottom surface 61. The front longitudinal wall 62 is mounted on the bottom surface 61 via a first mounting portion 64 and a second mounting portion 65, and is mounted on the inner longitudinal wall 63 via a third mounting portion 66.

[0097] The first mounting portion 64 is provided at the front end of the front longitudinal wall 62. The first mounting portion 64 is formed along the shape of the bend 61a and is bolted to the bend 61a in a state along the bend 61a.

[0098] The second mounting part 65 is located at the lower end of the front-to-rear midpoint of the longitudinal wall 62. The second mounting part 65 is bolted to the bottom part 61.

[0099] The third mounting part 66 is located at the rear end of the front longitudinal wall 62. The third mounting part 66 is bolted to the inner longitudinal wall 63.

[0100] The near-front longitudinal wall 62 includes: a first inclined portion 62A, which is inclined such that it is further away from the inner longitudinal wall 63 towards the rear; a parallel portion 62B, which is continuously disposed from the rear end of the first inclined portion 62A and is parallel (or substantially parallel) to the inner longitudinal wall 63; and a second inclined portion 62C, which is continuously disposed from the rear end of the parallel portion 62B and is inclined such that it is further away from the inner longitudinal wall 63 towards the rear. Figure 6 In the diagram, L1 represents the extension line of the parallel section 62B. The intersection point P1 of the extension line L1 and the front surface of the threshing device 6 is located near the index I. That is, the parallel section 62B extends towards the index I. The second inclined section 62C protrudes further rearward than the rear end of the bottom section 61.

[0101] [Other Implementation Methods]

[0102] (1) In the above embodiment, the avoidance mechanism M includes a curved portion 50 and a longitudinal wall 51. However, it is also possible that the avoidance mechanism M includes only either the curved portion 50 or the longitudinal wall 51.

[0103] (2) In the above embodiment, the bent portion 50 is formed in a generally inverted U-shape. However, the bent portion 50 is not limited to an inverted U-shape as long as it functions as an avoidance mechanism M.

[0104] (3) In the above embodiment, in the curved portion 50, the upper lateral width W1 is narrower than the lower lateral width W2, and has a width that is more than half the width of the lower lateral width W2. However, it is also possible that in the curved portion 50, the upper lateral width W1 has a width that is less than half the width of the lower lateral width W2. Alternatively, it is also possible that in the curved portion 50, the upper lateral width W1 has a width that is wider than the lower lateral width W2.

[0105] (4) In the above embodiment, the cutting section 4 is configured to harvest seven plants. However, the cutting section 4 is not limited to harvesting seven plants. For example, the cutting section 4 may be configured to harvest six plants.

[0106] Industrial availability

[0107] This invention can be used in semi-feed combine harvesters.

Claims

1. A combine harvester, comprising: A threshing device that threshes the harvested rice stalks; The ear-top conveying device locks and conveys the ear-top portion of the harvested rice stalks toward the threshing device; The ear-tip conveying device includes: an annular rotating chain; multiple claws mounted on the annular rotating chain and engaged with the ear-tip side portion of the harvested rice stalk; and a guide component that guides the harvested rice stalk toward the annular rotating chain. The combine harvester is characterized by having a support frame that supports the guide component. When viewed from above, the support frame extends relative to the guide member from the side opposite to the annular rotating chain in a direction intersecting the conveying direction of the ear-sprout conveying device. It includes an avoidance mechanism to prevent the tip of the harvested rice stalk extending outward from between the annular rotating chain and the guide member from contacting the support frame during the conveying of the rice stalk. As the avoidance mechanism, it has a portion that extends upward from the guide member in a manner that causes the support frame to meander upward.

2. The combine harvester as described in claim 1, characterized in that, As the avoidance mechanism, it has a curved portion formed by the support frame detouring upwards.

3. The combine harvester as described in claim 2, characterized in that, The curved portion has: a first longitudinal portion extending upward from the guide member; a transverse portion extending laterally from the upper end of the first longitudinal portion toward a side opposite to the annular rotating chain; and a second longitudinal portion extending downward from the end of the transverse portion on the side opposite to the first longitudinal portion.

4. The combine harvester as described in claim 2 or 3, characterized in that, As the avoidance mechanism, it has a longitudinal wall extending upstream from the support frame along the guide member toward the conveying direction of the ear tip conveying device.

5. The combine harvester as described in claim 2, characterized in that, As the avoidance mechanism, it includes a longitudinal wall extending upstream of the support frame along the guide member toward the conveying direction of the ear-feather conveying device. The curved portion has: a first longitudinal portion extending upward from the guide member; a transverse portion extending laterally from the upper end of the first longitudinal portion toward a side opposite to the annular rotating chain; and a second longitudinal portion extending downward from the end of the transverse portion on the side opposite to the first longitudinal portion.

6. The combine harvester as described in claim 3 or 5, characterized in that, In the curved section, the upper lateral width (W1) is more than half the width of the lower lateral width (W2).

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