阅读说明：本技术 联合收割机 (Combine harvester ) 是由 田中祐二 濑川卓二 于 2008-07-30 设计创作，主要内容包括：本发明提供一种能够轻松高效地进行承接网的清扫和检修作业的联合收割机。该联合收割机具有脱粒机(4),该脱粒机(4)具有将收割禾秆的整体投入到脱粒室(31)并利用自由旋转驱动的脱粒滚筒进行脱粒处理的脱粒部(30)、和通过自由摆动的筛选装置(42)对来自上述脱粒室(31)的脱粒处理物进行筛选处理的筛选部(40),其中,具有以能自由摆动开闭的方式支撑形成上述脱粒机(4)的上述脱粒室(31)的上横向侧壁部的枢支机构(81)、和以能自由装卸的方式支撑上述上横向侧壁部的装卸机构(80)。(The invention provides a combine harvester which can easily and efficiently clean and overhaul a bearing net. The combine harvester is provided with a thresher (4), the thresher (4) is provided with a threshing part (30) for throwing the whole harvested straws into a threshing chamber (31) and performing threshing treatment by using a threshing cylinder driven in a free rotation mode, and a screening part (40) for screening the threshed treatment object from the threshing chamber (31) through a screening device (42) capable of swinging freely, wherein the combine harvester is provided with a pivot support mechanism (81) for supporting and forming the upper transverse side wall part of the threshing chamber (31) of the thresher (4) in a manner of swinging freely and opening and closing, and a loading and unloading mechanism (80) for supporting the upper transverse side wall part in a manner of loading and unloading freely.)

1. A combine harvester comprises a thresher (4), the thresher (4) having a threshing part (30) for throwing the whole of the harvested straw into a threshing chamber (31) and performing threshing treatment by a threshing cylinder driven to rotate freely, and a screening part (40) for screening the threshed treatment material from the threshing chamber (31) by a screening device (42) swinging freely,

characterized in that the thresher comprises a pivot mechanism (81) for supporting an upper lateral side wall portion of the threshing chamber (31) forming the thresher (4) in a freely swingable opening and closing manner, and a loading and unloading mechanism (80) for supporting the upper lateral side wall portion in a freely loading and unloading manner.

2. A combine harvester according to claim 1, wherein a grain sieve loading/unloading window (90) for taking out and loading the grain sieve (55) of the sieving mechanism is provided in a lower lateral side wall portion of the sieving portion (40) forming the thresher (4).

3. A combine harvester according to claim 1, characterised in that it has a pivot support (94) supporting the top plate (34) forming the threshing chamber (31) of the thresher (4) in a freely swingable opening and closing manner.

4. A combine harvester according to claim 1, characterized in that it comprises a dust feed valve (35) and a reinforcing plate (100), wherein the dust feed valve (35) is connected to the inner surface side of a top plate (34) forming the threshing chamber (31) of the thresher (4) in a row in the direction of the rotational axis of the threshing cylinder, and the reinforcing plate (100) is connected to the outer surface side of the top plate (34) in a manner of being co-fastened with the plurality of dust feed valves (35).

5. A combine harvester according to claim 1, characterised in that a freely rotatably driven rotary drum (227) for harrowing standing straw to the harvesting device is provided at the harvesting section (220),

among the teeth (245, 246) provided on the rotary drum (227) and arranged in the direction of the rotational axis of the rotary drum, the bending strength of the end side teeth (246) located on the lateral end side of the rotary drum is set to be greater than the bending strength of the inner side teeth (245) located inside the rotary drum.

6. A combine harvester according to claim 5, characterised in that the inner teeth (245) are shaped such that the tip side of the inner teeth (245) is located further towards the outer periphery of the rotatable drum than the tip side of the tip teeth (246).

7. A combine harvester according to claim 5, characterised in that the extension (L1) of the end side teeth (246) from the tooth support (242) is set shorter than the extension (L2) of the inner side teeth (245) from the tooth support (242).

8. A combine harvester according to claim 5, wherein, of a pair of the teeth supporting portions (242) adjacent to each other in the rotation direction of the rotation drum (227), an inner teeth group having a plurality of the inner teeth (245) supported by one of the teeth supporting portions (242) and an inner teeth group having a plurality of the inner teeth (245) supported by the other one of the teeth supporting portions (242) are disposed so as to be shifted in the rotation axial center direction of the rotation drum.

Technical Field

The present invention relates to a combine harvester having a thresher including a threshing section for putting a whole of harvested straw into a threshing chamber and performing threshing processing by a threshing cylinder driven to rotate freely, and a screening section for screening a threshing processed product from the threshing chamber by a free swing screening device.

Background

Among the above-mentioned combine harvesters, there has been conventionally known, for example, a harvester described in japanese patent application laid-open No. h 6-253657 (paragraph 0010, fig. 3 and 4) (hereinafter referred to as "patent document 1") as a harvester capable of opening a threshing chamber.

In the combine harvester described in patent document 1, a top plate of a threshing chamber is attached to the combine harvester so as to be openable and closable around a longitudinal axis.

Although the threshing chamber can be opened by adopting the above-described prior art, there is a problem in cleaning and maintenance of the receiving net.

That is, in the case of opening the threshing chamber by the conventional technique, although the threshing chamber can be opened and the hand or the cleaning tool can be put into the threshing cylinder, the hand or the cleaning tool cannot reach the receiving net, and the receiving net needs to be pulled out from the opening of the threshing chamber in order to clean and inspect the receiving net.

Disclosure of Invention

The invention aims to provide a combine harvester which can easily and efficiently clean and overhaul a receiving net.

The present invention is characterized in that a combine harvester is provided with a thresher having a threshing part for throwing the whole of harvested straw into a threshing chamber and performing threshing treatment by a threshing cylinder driven to rotate freely and a screening part for screening the threshed treatment from the threshing chamber by a screening device capable of swinging freely, wherein the combine harvester is provided with a pivot support mechanism for supporting an upper lateral wall part of the threshing chamber of the thresher in a manner of swinging freely to open and close and a loading and unloading mechanism for supporting the upper lateral wall part in a manner of loading and unloading freely.

According to this configuration, the upper lateral side wall portion can be swung open or detached, whereby the lateral side portion of the threshing chamber can be opened with the receiving net facing the opening, and cleaning and maintenance can be performed with the receiving net still attached to the threshing chamber.

In addition, depending on the scale of cleaning and inspection, the tool, and the like, the upper lateral side wall portion may be opened by swinging without being detached, and the upper lateral side wall portion may be detached to prevent the upper lateral side wall portion from becoming an obstacle, thereby facilitating the work.

Therefore, the cleaning and maintenance work of the receiving net can be easily and efficiently performed without taking the receiving net out of the threshing chamber. In addition, the upper lateral side wall portion may be removed to prevent the upper lateral side wall portion from becoming an obstacle, and the work can be efficiently performed.

In the above configuration, it is preferable that a grain sieve loading/unloading window for loading and unloading the grain sieve of the sieving device is provided in a lower lateral side wall portion of the sieving portion forming the thresher.

According to this structure, can take out and put into the cereal sieve through cereal sieve loading and unloading window and change thereby.

Therefore, when the type of grain to be harvested changes, the entire swing type screening apparatus can be replaced with a grain screen having a different mesh without requiring the labor of removing the entire swing type screening apparatus from the screening section, and appropriate screening processing can be performed easily.

In the above configuration, it is preferable to provide a pivot support mechanism for supporting a top plate forming the threshing chamber of the thresher so as to be swingable to open and close.

According to this configuration, the upper part of the threshing chamber can be opened and the receiving net can be taken out from the threshing chamber by swinging the opening top plate.

Therefore, when the type of grain to be harvested changes, the receiving net can be replaced with a receiving net having a different mesh, and appropriate threshing can be performed.

In the above configuration, it is preferable that the threshing machine further includes a dust feed valve connected to an inner surface side of a top plate forming the threshing chamber of the threshing machine in a row in a rotation axial center direction of the threshing cylinder, and a reinforcement plate connected to an outer surface side of the top plate in a co-fastening manner with the plurality of dust feed valves.

According to this structure, the supporting strength can be enhanced by the reinforcing plate, so that the dust sending valve can be firmly supported by the top plate.

Therefore, even if a large reaction force from the threshing object acts on the dust feed valve, the dust feed valve can be firmly supported by the top plate, and the flow of the threshing object can be guided with high accuracy by the dust feed valve. Further, the structure can be realized by a simple structure of providing only the reinforcing plate, and the structure can be obtained at a lower cost than a case where the top plate is formed of a thick plate.

In the above configuration, it is preferable that the teeth provided on the rotary drum in the direction of the rotation axis of the rotary drum have a bending strength of the end teeth located on the lateral end side of the rotary drum set to be greater than a bending strength of the inner teeth located on the inner side of the rotary drum.

Conventionally, there is a structure in which all the teeth arranged in the direction of the rotation axis of the rotating drum have the same bending strength, but in a combine harvester using the technology related to the conventional rotating drum, there is a case in which threshing or raking is insufficient.

That is, on the lateral end side in the rotation axis direction of the rotating drum, upright straws that have not harvested the land are tangled and enter the harvester together with the harvesting target straws in some cases. If the bending strength of the end-side teeth located on the lateral end side of the rotating drum is small, the end-side teeth deform due to a strong reaction force from the straw, and a problem occurs in that the raking of the straw by the end-side teeth is poor. Therefore, in order to make it difficult for the end side teeth to rake poorly, it is necessary to increase the bending strength of the end side teeth so that the end side teeth rake strongly. In this way, the bending strength of the inner teeth located inward in the rotation axis center direction of the rotary drum is also increased. In fact, the inner teeth act on the reaped object straw tangled with standing straw without reaped land without receiving as large a reaction force as the end teeth, and nevertheless exert a strong raking action on the straw without deflection due to the reaction force. As a result, the inside of the rotary drum is likely to cause a problem of threshing depending on the kind of straw.

Therefore, with this configuration, the end-side teeth, which rake standing straw on the lateral end side of the rotating drum, have a greater bending strength than the inner-side teeth, and even if the reaction force from the straw is large, the deformation is less likely to occur, and a strong raking action can be performed.

On the other hand, the inner teeth, which rake standing straw inside the rotating drum, have a smaller bending strength than the end teeth, and thus, when receiving a large reaction force from straw, they easily bend and gently rake the straw.

Therefore, the harrowing of the straw to the harvesting device by the rotary drum can be performed in a good state in which insufficient harrowing or threshing is difficult to occur, the straw can be smoothly flowed to perform efficient work, and the loss of grains can be prevented.

In the above configuration, it is preferable that the inner teeth are formed such that a distal end side of the inner teeth is located on the outer peripheral side of the rotary drum than a distal end side of the end teeth.

According to this configuration, even if the rotary drum is lowered to act at a position as close to the ground as possible and the inner teeth are grounded, the end side of the inner teeth is located on the outer peripheral side of the rotary drum than the end side of the end teeth, and therefore, the end teeth can be easily prevented from being grounded. The inner teeth have a lower bending strength than the end teeth, and are more likely to be elastically deformed by grounding, and are less likely to be deformed or broken.

Therefore, even if the rotating drum is excessively lowered to cause grounding, the combine harvester with excellent durability, which is less likely to be deformed or damaged by grounding of the inner side teeth or the end side teeth, can be obtained.

In the above configuration, it is preferable that an extension length of the end side teeth from the teeth support portion is set to be shorter than an extension length of the inner side teeth from the teeth support portion.

According to this configuration, even if the rotary drum is lowered to act at a position as close to the ground as possible and the inner teeth are grounded, the length of extension of the end teeth from the teeth support portion is shorter than the length of extension of the inner teeth from the teeth support portion, and therefore grounding of the end teeth is easily avoided. The inner teeth have a lower bending strength than the end teeth, and are more likely to be elastically deformed by grounding, and are less likely to be deformed or broken.

Therefore, even if the rotating drum is excessively lowered to cause grounding, the combine harvester with excellent durability, which is less likely to be deformed or damaged by grounding of the inner side teeth or the end side teeth, can be obtained.

In the above-described configuration, it is preferable that, in a pair of the teeth support portions adjacent to each other in the rotation drum rotation direction of the rotation drum, an inner tooth group having a plurality of the inner teeth supported by one of the teeth support portions and an inner tooth group having a plurality of the inner teeth supported by the other of the teeth support portions are disposed so as to be shifted in the rotation axis center direction of the rotation drum.

According to this configuration, since the mounting interval of the inner teeth on each of the teeth support portions can be set large and the number of the inner teeth of the rotating drum can be reduced, the inner teeth can be obtained at low cost in terms of the number of the inner teeth, and the straw can be harrowed with high accuracy by the rotating drum.

That is, the inner teeth on one tooth support portion are aligned with each other and the inner teeth on the other tooth support portion are aligned in the circumferential direction of the rotating drum. Thus, the interval between the inner teeth on each of the teeth support portions can be set large, and the number of the inner teeth provided on each of the teeth support portions can be reduced, and as a result, even if there is a standing straw which is positioned between the inner teeth of the teeth support portion reaching below the rotating drum and is not caught by the inner teeth positioned on the teeth support portion, the inner teeth of the next reaching teeth support portion can catch the standing straw and rake it up into the cutting apparatus.

Drawings

Fig. 1 is a left side view of the combine as a whole;

fig. 2 is a right side view of the combine as a whole;

fig. 3 is a top view of the combine as a whole;

FIG. 4 is a longitudinal sectional side view of the thresher;

FIG. 5 is a front cross-sectional view of the thresher;

FIG. 6 is a rear longitudinal sectional view of the secondary feed back device;

FIG. 7 is a side view of a secondary feed back device;

fig. 8 is a perspective view in an opened state of the upper lateral side wall portion;

fig. 9 (a) is a plan view in a state where the upper lateral side wall portion is closed, and fig. 9 (B) is a plan view in a state where the upper lateral side wall portion is swung open;

FIG. 10 is a side view of the attachment and detachment mechanism and the pivot support mechanism;

FIG. 11 is a rear elevational view of the attachment and detachment mechanism and the pivot support mechanism;

FIG. 12 is a top view of the locking mechanism;

FIG. 13 is a front view of the locking mechanism;

FIG. 14 is a side view of the grain screen loading window mounting portion of the outboard lateral side wall;

FIG. 15 is a top view of the top plate;

FIG. 16 is a cross-sectional view of the gusset fitting portion of the top plate;

fig. 17 is a left side view of the whole of the combine harvester of the second embodiment;

fig. 18 is a right side view of the whole of the combine harvester of the second embodiment;

fig. 19 is a plan view of the whole of the combine harvester of the second embodiment;

figure 20 is a side view of the rotating drum assembly of the harvesting portion;

FIG. 21 is a side view of the rotating drum;

FIG. 22 is a top view of the rotating drum;

FIG. 23 is a front view of one end side in the lateral direction of the rotary drum;

fig. 24 is a front view of the other lateral end side of the rotary reel;

fig. 25 is a side view of the rotary drum in a lowered operation state on the low position side;

fig. 26 is a side view of the rotary drum in a lowered operation state on the high position side;

fig. 27 is a side view of the rotary drum in a lowered operation state on the low position side;

FIG. 28 is a side view of the tooth support;

FIG. 29 is a top view of a portion of a screw feeder;

FIG. 30 is a side view of the seat support structure;

FIG. 31 is a top view of the seat support structure;

FIG. 32 is a front view of the seat support structure;

fig. 33 is a side view at the tooth support of the rotary drum having the second embodiment.

Detailed Description

[ first embodiment ]

A first embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a left side view of the whole of a combine harvester according to a first embodiment of the present invention. Fig. 2 is a right side view of the combine harvester as a whole in an embodiment of the invention. Fig. 3 is a plan view of the combine harvester as a whole according to the embodiment of the present invention. As shown in these figures, the combine harvester of the embodiment of the present invention has: a traveling machine body which is self-propelled by a pair of crawler traveling devices 1, 1 on the left and right, and which has a driving unit 2 to which a driving seat 2a is attached; a thresher 4 mounted on the rear side of the machine body frame 3 of the traveling machine body; a grain bagging part 10 equipped with a bagging box 11 provided at a lateral side of the thresher 4; and a harvesting part 20 connected with a feeding device 21 at the front part of the thresher 4.

The combine harvester harvests rice, wheat and the like.

That is, the harvesting unit 20 includes, in addition to the feeding device 21 described above: a harvester frame 22 connected to a front end portion of the feeding device 21; a crop divider 23 provided on both lateral sides of a front end portion of the harvester frame 22; a pusher-shaped harvesting unit 24 provided on the harvester frame 22 so as to be freely drivable at a front end of the stand portion 22a of the harvester frame 22; a screw feeder 25 rotatably disposed on the harvester frame 22 on the upper surface side of the frame part 22 a; and a rotary drum 27 supported rotatably and driveably by a pair of right and left support arms 26, 26 extending forward from an upper portion of the harvester frame 22 on the base end side.

The feeder 21 is vertically swung about a lifting axis P extending in the transverse direction of the machine body with respect to the thresher 4 by a hydraulic cylinder 28, whereby the reaping unit 20 is lifted to a lowered operating state in which the platform part 22a of the reaping machine frame 22 is lowered to the vicinity of the ground and a raised non-operating state in which the reaping machine frame 22 is greatly raised from the ground. When the traveling machine body is driven in a lowered state of the harvesting section 20, the harvesting section 20 performs a harvesting process of harvesting standing straws and a process of supplying the harvested straws to the thresher 4.

That is, the standing straw is divided into a harvesting object and a non-harvesting object by the pair of left and right dividers 23, and then the standing straw as the harvesting object is harrowed up to the harvesting device 24 by the rotary reel 27 while being harvested by the harvesting device 24. The harvested straws are transversely fed to the front of the feeding device 21 along the stage part 22a by means of screw plates 25a at both end sides of the screw feeder 25. The harvested straw reaching the front of the feeder 21 is fed to the inlet of the feeder 21 located at the rear side of the screw feeder 25 by the gathering and feeding of the conveying arm 25b integrally and freely rotatably provided in the middle of the screw feeder 25. Then, the harvested straw fed into the feeding device 21 is conveyed to the rear through the inside of the feeding device 21 by the conveyor 29 located inside the feeding device 21. The harvested straw reaching the rear end of the feeder 21 is thrown into the front end of a threshing chamber 31 (see fig. 4) of the thresher 4 from the root to the tip of the ear by the gathering and feeding action of the conveyor 29.

Fig. 4 is a longitudinal sectional side view of the thresher 4. Fig. 5 is a front cross-sectional view of the thresher. As shown in these figures, the thresher 4 includes: a threshing part 30 having the threshing chamber 31, and a screening part 40 having a screening chamber 41 located below the threshing chamber 30.

The threshing unit 30 includes, in addition to the threshing chamber 31: a threshing cylinder 32 provided in the threshing chamber 31 so as to be freely rotatably driven around a threshing cylinder rotation axis 32a facing the front and rear of the machine body; a receiving net 33 disposed in the threshing chamber 31 along the periphery of the lower portion of the threshing cylinder 32; the dust sending valves 35 are arranged on the inner surface side of the top plate 34 of the threshing chamber 31 in a direction along the rotation axis 32a of the threshing cylinder.

The threshing unit 30 performs threshing processing as follows.

That is, the harvested cereal stalks put into the front end of the threshing chamber 31 are fed into the threshing processing section of the threshing cylinder 32 having threshing teeth 32c by the helical plate-shaped raking teeth 32b provided integrally rotatably at the front end of the threshing cylinder 32. The harvested straws fed to the threshing processing section are threshed by the threshing teeth 32c and the receiving net 33, which are round bars arranged in the circumferential direction and the front-rear direction of the threshing cylinder 32. At this time, straw chips and the like flow rearward of the threshing chamber 31 by the transfer action of the rotation of the threshing cylinder 32 and the flow guide action of the dust feed valves 35. The grain thus separated passes through the receiving net 33 and falls into the sifting device 42 of the sifting portion 40, and dust such as straw chips is discharged from the dust feeding port 36 located at the rear end of the threshing chamber 31.

The screening section 40 includes a wind turbine 43 provided below the front end of the screening apparatus 42 in addition to the screening chamber 41 and the screening apparatus 42; a primary screw conveyor 44 and a secondary screw conveyor 45 provided at the bottom of the screening chamber 41.

The screening device 42 includes: a screen box 50 interlocked with a screen driving mechanism 46 located at a rear end portion of the screen chamber 41; an upper grain tray 51, a chaff screen 52 and a straw walker 53 arranged in the front-rear direction of the screen box at the upper part of the inner side of the screen box 50; a lower grain tray 54 and a grain sieve 55 arranged at the bottom of the sieve box 50 in the front-rear direction of the sieve box.

The screening device 42 includes a screening adjustment plate 56 detachably provided at a front end portion of the chaff screen 52. The screening adjusting plate 56 is used in the following manner when the threshing processed object dropped from the receiving net 33 onto the upper grain tray 51 contains a large amount of dust such as straw chips: under the screen line 57 extending from the rear end of the upper grain tray 51, the processed material drop holes of the chaff screen 52 are closed.

The screening unit 40 drives the screening device 42 by the above-described screening drive mechanism 46 in a swinging manner, and supplies screening wind in the front-rear direction of the thresher to pass through the chaff sieve 52, the straw walker 53, and the grain sieve 55 by the wind turbine 43, thereby performing a screening process of the threshed objects.

That is, the threshed products falling from the receiving net 33 are received by the screening device 42, and the threshed products are subjected to swing screening by the upper grain pan 51, the chaff screen 52, the straw walker 53, the lower grain pan 54, and the grain screen 55 and wind screening by the screening wind, thereby screening the single grain as the primary processed product, the mixture of the branched grains and the straw chips as the secondary processed product, and the dust such as the straw chips as the tertiary processed product. The primary processed material is dropped to the primary screw conveyor 44, and is conveyed to the lateral outside of the thresher body by the primary screw conveyor 44. The secondary processed matter is dropped onto the secondary screw conveyor 45, and is conveyed to the lateral outside of the thresher body by the secondary screw conveyor 45. The threshed processed objects and the threshed processed objects from the dust feeding port 36 of the threshing chamber 31 are discharged from the dust discharging port 47 at the rear part of the threshing machine body to the rear outer side of the threshing machine body by the screening wind.

The dust discharge port 47 has a dust discharge cover 48 for guiding the downward flow of the discharged dust so that the dust does not spread to the rear of the thresher.

As shown in fig. 2, the grain bagging section 10 includes, in addition to the bagging box 11, a bag support section that supports the upper end side of the grain bag attached to the discharge tube 12 by a bag support rod 13 and supports the lower end side of the grain bag by a bag receiving table 14. The discharge tube 12 is located at the lower part of the bagging box 11.

The bagging box 11 is supplied with the husked grains from the first-stage screw conveyor 44 by a winnowing device 15 (see fig. 3), stores the husked grains, and discharges the stored husked grains from the discharge tube 12 into a grain bag.

As shown in fig. 3, the thresher 4 has a secondary feed back device 60 disposed laterally outside the thresher body. Fig. 6 is a longitudinal rear sectional view of the secondary feed back device 60. Fig. 7 is a side view of the secondary feed back device 60 described above. As shown in these figures, the secondary feed-back device 60 has: a treatment tank 62 having an inlet 61 communicating with a conveying end portion of the two-stage screw conveyor 45; two processing blades 63 provided inside the processing box 62 so as to be connected to the screw shaft of the secondary screw conveyor 45 so as to be integrally rotatable; a winnowing barrel 64 whose lower end side is communicated with the discharge port of the treatment box 62; a winnowing screw 65 rotatably provided in the winnowing barrel 64; a transmission case 66 disposed across the lateral side of the treatment case 62 and the lower end of the winnowing drum 64.

The secondary feed-back device 60 rotationally drives the processing blades 63 by the secondary screw conveyor 45, transmits the driving force of the secondary screw conveyor 45 to the lower end of the winnowing screw 65 by the transmission chain 67 housed in the transmission case 66 to drive the winnowing screw 65, and performs the re-screening process in the screening device 42 after performing the singulation process on the secondary processed object from the screening section 40.

That is, the processed object from the secondary screw conveyor 45 is introduced into the processing box 62 by the conveying force of the secondary screw conveyor 45. The grain with branches mixed in the secondary processed product that has entered the processing box 62 is processed and divided into individual pieces by the beating action of the processing blades 63. The processed material such as the processed grains and straw chips is sent to the winnowing barrel 64 by the rotating processing blade 63. The processed matter entering the winnowing barrel 64 is winnowed to the upper end of the winnowing barrel 64 by the winnowing screw 65. The processed material reaching the upper end of the winnowing barrel 64 is fed into a return port 69 located on the lateral side wall of the thresher 4 by the throwing action of a rotary blade 68 integrally and rotatably attached to the screw shaft of the winnowing screw 65, and is dropped from the return port 69 to the sieving chamber 41 through a space between the body lateral side wall of the threshing chamber 31 and the threshing cylinder 32, thereby being supplied to the front end of the sieving device 42.

The treatment tank 62 includes: a box body 62a bolted to a lateral side wall 70 (hereinafter referred to as inner lateral side wall 70) located on the lateral inner side of the travel machine body of the thresher 4; a side plate 62c detachably connected to the box main body 62a by a connecting bolt 62b on the side opposite to the side where the inlet 61 is located.

That is, by detaching the side plate 62c to open the inside of the treatment tank 62, the inside of the treatment tank can be inspected and cleaned even in a state where the tank main body 62a is still connected to the inner lateral side wall 70. The transmission case 66 is detachably connected to the screw shaft of the secondary screw conveyor 45 and the input shaft 65a of the winnowing screw 65, and the transmission case 66 can be attached to and detached from the side plate 62 c.

As shown in fig. 1, the thresher 4 includes an upper front cover 72, an upper rear cover 73, a lower front cover 74, and a lower rear cover 75, which are provided on the outer surface side of a lateral side wall 71 (hereinafter referred to as an outer lateral side wall 71, see fig. 5) located laterally outside the running machine body.

The upper front cover 72, the lower front cover 74, and the lower rear cover 75 cover a belt transmission mechanism 76 (see fig. 14) provided on the outer surface side of the outer lateral side wall 71. The belt transmission mechanism 76 transmits the driving force from the engine 5 (see fig. 2) located below the driver seat 2a to the threshing cylinder 32, the wind turbine 43, the primary screw conveyor 44, the secondary screw conveyor 45, and the sorting drive mechanism 46.

The upper front cover 72, the lower front cover 74, and the lower rear cover 75 are supported on the outer lateral side walls 71 by a mounting and dismounting mechanism (not shown) provided across the covers 72, 74, and 75 and the outer lateral side walls 71. The attaching and detaching mechanism of each cover 72, 74, 75 is constituted by a hook (not shown), and the hook is operated to swing to the detaching side by an operation element 77 provided in the cover 72, 74, 75, thereby releasing the connection of the cover 72, 74, 75 to the outer lateral side wall 71.

The covers 72, 74, and 75 may be detachably connected by connecting bolts.

As shown in fig. 8, the upper lateral side wall portion 71a of the outer lateral side wall 71 of the thresher 4, which forms the threshing chamber 31, and the lower lateral side wall portion 71b, which forms the sieving portion 40, are formed as separate bodies, and the upper lateral side wall portion 71a is supported on the inner surface side of the upper rear cover 73. A loading and unloading mechanism 80 and a pivot support mechanism 81 are provided across the rear end of the upper rear cover 73 and the body frame 78 of the thresher 4.

Fig. 10 is a side view of the attachment/detachment mechanism 80 and the pivot support mechanism 81. Fig. 11 is a rear view of the attachment/detachment mechanism 80 and the pivot support mechanism 81. As shown in these figures, the attachment/detachment mechanism 80 and the pivot support mechanism 81 include: a pair of upper and lower pivot shafts 83, 83 provided by attaching a pair of upper and lower support bodies 82, 82 to the body frame 78; a pair of upper and lower connection holes 85, 85 provided by connecting a pair of upper and lower connection plates 84, 84 to the inner surface side of the upper rear cover 73.

The pair of upper and lower connecting plates 84, 84 are externally fitted to the pair of upper and lower pivot shafts 83, 83 from above through the pair of upper and lower connecting holes 85, the pair of upper and lower support bodies 82, 82 receive and support the connecting plates 84 from below through upper surfaces thereof, and the attachment/detachment mechanism 80 attaches the upper rear cover 73 to the machine body frame 78, thereby obtaining a state in which the upper lateral side wall portion 71a is attached to the machine body frame 78. The pivot support mechanism 81 pivotally supports the upper lateral side wall portion 71a together with the upper rear cover 73 so as to be swingable to open and close around an opening/closing axis X located on the rear end side of the upper lateral side wall portion 71a and having the pair of upper and lower pivot support shafts 83, 83.

The attachment/detachment mechanism 80 releases the connection of the upper lateral side wall portion 71a to the body frame 78 by releasing the connection of the upper rear cover 73 to the body frame 78 by pulling out the pair of upper and lower connection plates 84, 84 from the pivot shaft 83.

Fig. 9 (a) is a plan view in a state where the upper lateral side wall portion 71a is closed. As shown in the drawing, the upper rear cover 73 is connected to the machine body frame 78 by the attachment/detachment mechanism 80, and is set in a closed state aligned in the travel machine body front-rear direction with the upper front cover 72 in the attached state. Thus, the upper lateral side wall portion 71a closes the threshing chamber lateral opening 86 located at the outer lateral side wall 71. At this time, the upper lateral side wall portion 71a can be fixed in the closed state by fixing the upper rear cover 73 in the closed state by the lock mechanism 87 provided astride the front end portion of the upper rear cover 73 and the outer lateral side wall portion 71.

Fig. 12 is a plan view of the lock mechanism 87. Fig. 13 is a front view of the lock mechanism 87. As shown in these figures, the lock mechanism 87 includes: a locking lever 87a provided on the outer surface side of the outer lateral side wall 71; a pair of hooks 87b, 87b configured to be engaged with and disengaged from the lock lever 87a and provided on the back surface side of the front end portion of the upper rear cover 73; and an operation member 88 provided on the front surface side of the upper rear cover 73 for pivotally releasing the pair of hooks 87b, 87 b.

Instead of the locking mechanism 87, the upper lateral side wall portion 71b may be closed and locked by closing and fixing the upper rear cover 73 with a connecting bolt.

The upper lateral side wall portion 71a indicated by a solid line in fig. 8 is an upper lateral side wall portion in a swing open state. The upper lateral side wall portion 71a shown by a two-dot chain line in fig. 8 is an upper lateral side wall portion in a detached and opened state. Fig. 9 (B) is a plan view of the upper lateral side wall portion 71a in a swing-open state. As shown in these figures, the upper rear cover 73 in the state where the lock mechanism 87 has been switched to the unlocked state swings open laterally outward of the travel machine body about the opening/closing axis X. Thus, the upper lateral side wall portion 71a swings outward in the lateral direction of the travel machine body together with the upper rear cover 73, and is brought into a swing open state. Alternatively, the upper rear cover 73 is lifted up with respect to the support body 82, and the upper and lower pair of connecting plates 84, 84 are pulled out from the pivot shaft 83, thereby releasing the connection of the upper rear cover 73 to the body frame 78 by the attachment/detachment mechanism 80. Thus, the upper lateral side wall portion 71a is detached from the body frame 78 together with the upper rear cover 73, and is in a detached and opened state. In either case, the threshing chamber lateral opening 86 is opened, and the receiving net 33 can be inspected and cleaned laterally outward of the threshing machine body while still being attached to the threshing chamber 31.

As shown in fig. 9 (B), the other end side of the lock lever 89 supported rotatably and elevatably on the lower link plate 84 at one end side is fitted into the lock lever hole 82a of the support 82 in a state where the upper lateral side wall portion 71a is swung open. In this way, the lock lever 89 can hold and support the upper rear cover 73 in the opened state thereof, thereby fixing the upper lateral side wall portion 71a in the opened state.

As shown in fig. 5 and 14, the thresher 4 includes: a grain sieve attachment/detachment window 90 provided in the lower lateral side wall portion 71b of the outer lateral side wall 71 in which the sieving portion 40 is formed and the lower lateral side wall portion 70b of the inner lateral side wall 70 in which the sieving portion 40 is formed; and a cover 91 for the grain sieve loading/unloading window 90. The grain sieve attachment/detachment window 90 of the outer lateral side wall portion 71 is disposed so as to be covered by the lower rear cover 75. The grain sieve loading/unloading window 90 of the inner lateral side wall portion 70b is located below the bag box 11.

Each of the cover bodies 91 is attached to and detached from the lower lateral side walls 70b, 71b via an engaging portion 92 provided on the lower lateral side walls 70b, 71b so as to be detachably engaged with a lower end portion of the cover body 91, and a pair of connecting bolts 93, 93 attached to an upper end portion of the cover body 91, thereby opening and closing the grain sieve attaching/detaching window 90.

That is, when the type of crop to be harvested is changed, the grain sieve 55 is replaced with a grain sieve provided with a processed object falling hole of an appropriate size. This replacement is performed according to the following.

That is, the lower rear cover 75 and the cover 91 positioned behind the lower rear cover 75 are removed, and the grain sieve attachment/detachment window 90 of the outer lateral side wall 71 is opened, and the connection or disconnection between the one end side of the grain sieve 55 and the sieve box 50 by the connection bolt is performed through the grain sieve attachment/detachment window 90. The cover 91 positioned below the bagging box 11 is removed, the grain sieve attaching/detaching window 90 of the inner lateral side wall 70 is opened, and the other end side of the grain sieve 55 and the sieve box 50 are connected or disconnected by the connecting bolt from the grain sieve attaching/detaching window 90. The grain sieve 55 is inserted and removed from the sieve loading and unloading window 90 of the outer lateral side wall 71 or the inner lateral side wall 70 with respect to the sieving chamber 41.

As shown in fig. 5 and 15, the top plate 34 is connected to a machine body frame 95 via three pivot mechanisms 94 arranged in the front-rear direction of the traveling machine body at the end portion of the top plate 34 on the outer side in the lateral direction of the traveling machine body.

That is, the top plate 34 swings downward relative to the machine body frame 95 about the opening/closing axial center Y in the traveling machine body front-rear direction, which is included in the connecting pin 94a of each pivot mechanism 94, and takes a closed posture in which the free end portion 34a of the top plate 34 abuts against the machine body frame 96, thereby closing the threshing chamber upper opening 97. At this time, the three locking pieces 98 provided at the free end portion of the top plate 34 in the front-rear direction of the traveling machine body are applied to the machine body frame 96, whereby the top plate 34 can be fixed in the closed posture.

The top plate 34 is raised and swung about the opening/closing axis Y with respect to the machine body frame 95, whereby the threshing chamber upper opening 97 can be opened, the threshing cylinder 32 can be inspected and cleaned from the threshing chamber upper opening 97, and the receiving net 33 can be pulled out from the threshing chamber 31 to the outside through the threshing chamber upper opening 97. The receiving net 33 is divided into two divided receiving nets along the circumferential direction of the threshing cylinder and pulled out.

As shown in fig. 15, the top plate 34 has reinforcing plates 100 provided at both ends in the transverse direction of the traveling machine body on the outer surface side thereof. As shown in fig. 15 and 16, the reinforcing plates 100 are connected to the top plate 34 by connecting bolts 101 at positions corresponding to the end portions of the three dust feed valves 35 positioned at the front portion of the threshing chamber among the plurality of dust feed valves 35 so as to be fastened together with the dust feed valves 35.

That is, since the front part of the threshing cylinder 31 contains more objects to be processed such as grains and straw chips than the rear part, the dust feed valve 35 located at the front part of the threshing chamber 31 receives a stronger reaction force than the dust feed valve 35 located at the rear part of the threshing chamber 31. Therefore, each reinforcing plate 100 increases the supporting strength to firmly support the dust feed valve 35 by the top plate 34.

As shown in fig. 4, the screening device 42 is detachably connected to the support frame 102 via a mounting/demounting mechanism 103 provided across the rear end side of the screen box 50 and the support frame 102 interlocked with the screening drive mechanism 46.

That is, the dust exhaust cover 48 is detached from the thresher body, the dust exhaust port 47 is opened, a hand is inserted into the sieving chamber 41 from the dust exhaust port 47, the sieve box 50 connected to the support frame 102 by the attachment/detachment mechanism 103 is released, and the sieving device 42 is moved to the rear side of the thresher body. In this way, the sieve box 50 is slidably guided by the pair of right and left guide rails 104, 104 provided on the support frame 102, and the sieving device 42 is moved to the dust discharge port 47 through the threshing chamber, so that the whole sieving device 42 can be pulled out of the machine body from the dust discharge port 47 by a light taking-out operation.

Instead of the upper transverse side wall portion 71b of the above embodiment, a configuration of swinging around an axis located on the front end side of the upper transverse side wall portion and facing the vertical direction of the thresher body to open and close, or a configuration of swinging around an axis located on the upper end side of the upper transverse side wall portion and facing the front and rear direction of the thresher body to open and close may be adopted. In these cases, the object of the present invention can be achieved.

[ second embodiment ]

A second embodiment of the present invention will be described below with reference to the drawings.

Fig. 17 is a left side view of the combine harvester as a whole in accordance with the second embodiment of the present invention. Fig. 18 is a right side view of the whole of the combine harvester according to the second embodiment of the present invention. Fig. 19 is a plan view of the whole of the combine harvester according to the second embodiment of the present invention. As shown in these figures, the combine harvester of the embodiment of the present invention has: a traveling machine body that travels by self-traveling by a pair of crawler traveling devices 201, 201 on the left and right, and has a driving unit 202 to which a driving seat 202a is attached; a thresher 204 mounted on the rear side of the body frame 203 of the traveling body; a grain bagging section 210 equipped with a bagging box 211 provided at a lateral side of the thresher 204; and a harvesting part 220 connected with a feeding device 221 at the front part of the thresher 204.

The combine harvester harvests rice, wheat and the like.

That is, the harvesting unit 220 includes, in addition to the feeding device 221: a harvester frame 222 connected to a front end portion of the feeding device 221; a crop divider 223 provided on both lateral sides of the front end portion of the harvester frame 222; a pusher-shaped harvesting unit 224 disposed at a front end portion of a stand portion 222a of the harvesting frame 222 on the harvesting frame 222 and configured to be driven freely; a screw feeder 225 rotatably and drivingly disposed on the harvester frame 222 on the upper surface side of the frame part 222a in the vicinity of the rear side of the harvesting device 224; and a rotary drum 227, the rotary drum 227 being rotatably and drivingly supported by a pair of right and left support arms 226, the support arms extending forward from an upper portion of the harvester frame 222 on the base end side.

The feeding device 221 is vertically swung about a lifting axis P oriented in the body transverse direction with respect to the thresher 204 by a hydraulic cylinder 228, whereby the harvesting unit 220 is lifted to a lowered working state in which the platform portion 222a of the harvesting machine frame 222 is lowered to the vicinity of the ground and a raised non-working state in which the harvesting machine frame 222 is greatly raised from the ground. When the traveling machine body is driven in a state where the harvesting unit 220 is lowered, the harvesting unit 220 performs a harvesting process of harvesting standing straws and a process of supplying the harvested straws to the thresher 204.

That is, the standing straw is divided into a harvesting object and a non-harvesting object by the pair of left and right dividers 223, and then the standing straw as the harvesting object is harrowed up to the harvesting device 224 by the rotary reel 227 while being harvested by the harvesting device 224. The harvested straws are transversely conveyed to the front of the feeding device 221 along the shelf portion 222a by the screw plates 225a at both end sides of the screw feeder 225. The harvested straw reaching the front of the feeder unit 221 is fed to the inlet of the feeder unit 221 located on the rear side of the screw feeder 225 by the gathering and feeding of the conveying arm 225b integrally and freely rotatably provided in the middle of the screw feeder 225. Then, the harvested straw fed into the feeding device 221 is conveyed to the rear through the inside of the feeding device 221 by the conveyor 229 located inside the feeding device 221. The harvested straw reaching the rear end of the feeder 221 is thrown into a threshing chamber (not shown) of the thresher 204 from the root to the tip of the ear by the gathering and feeding action of the conveyor 229.

As shown in fig. 29, the tip end portion 225c of each screw plate 225a of the screw feeder 225 is formed of a steel wire rod welded to the screw plate 225 a.

That is, when wear occurs on the tip end portion 225c of the spiral plate 225a, repair can be performed only by replacing the tip end portion 225c by installing a new steel wire and replacing the worn steel wire.

The thresher 204 performs threshing processing using a threshing cylinder (not shown) that rotates harvested straw put into a threshing chamber.

As shown in fig. 18, the grain bagging section 210 includes a bag support section that supports the upper end side of the grain bag attached to the discharge tube 212 by a bag support rod 213 and supports the lower end side of the grain bag by a bag receiving table 214, in addition to the bagging box 211. The discharge tube 212 is located at a lower portion of the bag box 211.

The bagging tank 211 supplies and stores the hulled grains from a screening unit (not shown) of the thresher 204 by a winnower 215 (see fig. 18), and discharges the stored hulled grains from the discharge tube 212 into a grain bag.

As shown in fig. 18 and 19, the grain bagging section 210 includes a pair of front and rear work aids 216 and 216. Each work aid 216 is supported so as to be switchable between a lowered use posture in which it projects from the bag support portion to the outside in the lateral direction of the travel machine body as indicated by a solid line in fig. 18 and 19, and a raised storage posture in which it is positioned above the bag box 211 as indicated by a two-dot chain line in fig. 18. By switching each work aid 216 to the lowered use posture, each work aid 216 is located at an arrangement height of 1.0 to 1.1m from the height H of the upper surface of the bag receiving table 214, and thus a user riding to perform a bagging work on the grain bagging portion 210 can use it as a waist support member.

As shown in fig. 30, 31, and 32, the operator's seat 202a is supported on a seat support base 233 via a pair of left and right mounting members 230, 230 provided on the lower surface side of the operator's seat 202a, a connecting shaft 231 provided at the front end portions of the pair of left and right mounting members 230, and a support member 232 that rotatably supports both end portions 231a of the connecting shaft 231 by a support piece portion 232 a. The seat support base 233 serves as an engine cover that covers the engine 205. Each mounting member 230 is placed on and supported by the upper surface of the seat support base 233 via a cushion rubber 234 attached to the rear end of the mounting member 230 and a cushion rubber 234 attached to the connecting shaft mounting member 230 a.

The seat support base 233 has a seat fixing mechanism 236 provided with a seat fixing body 235, and the seat fixing body 235 is provided on the upper surface side of the seat support base 233. The seat fixing mechanism 236 includes a lock pin 237 detachably attached to the seat fixing body 235, in addition to the seat fixing body 235. The seat fixing mechanism 236 is a seat locking state in which the driver seat 202a is fixed in the lowered use posture by attaching the lock pin 237 to the pair of left and right vertical pieces 235a, 235a of the seat fixing body 235, and thereby causing the lock pin 237 to stop the rear end portion of the attachment member 230 from above and preventing the attachment member 230 from swinging upward around the axis of the end portion 231a of the connecting shaft 231.

That is, by releasing the lock pin 237 from the seat fixing body 235, the fixing of the operator's seat 202a by the seat fixing mechanism 236 can be released, and thereby the operator's seat 202a can be moved up and down with respect to the seat support base 233, and can be switched to a maintenance-use upward-opening posture in which the upper side of the seat support base 233 is opened.

The rotary reel 227 described above is explained below.

Fig. 21 is a side view of the rotary reel 227. Fig. 22 is a plan view of the rotary drum 227. Fig. 23 is a front view of one end side of the rotary reel 227. Fig. 24 is a front view of the other end side of the rotary drum 227. As shown in these figures, the rotary drum 227 has: a drive shaft 240 rotatably supported at the distal end portions of the pair of support arms 226, 226; a reel frame 241 integrally rotatably provided at left and right end portions of the drive shaft 240 and having a pentagonal shape as viewed from the side of the traveling machine body; tooth support portions 242 made of a circular tube material are provided on the rotary drum 227 so as to be aligned in the circumferential direction of the rotary drum 227 across a pair of left and right drum frames 241, and are disposed one at each of the five top portions of the drum frame 241.

Each of the reel frames 241 has: a sheet metal reel frame body 241b having five arms 241 a; a block 243 made of resin and provided at a distal end portion of each arm 241 a; and an annular band plate 244 wound over the five blocks 243 and connected to the arm 241a by a common fastening bolt shared by the blocks 243. Each block 243 constitutes a mounting portion to which the tooth support portion 242 is rotatably mounted. The endless belt plate 244 is formed of a divided belt plate material divided at the position of each arm 241 a.

The rotary reel 227 has: teeth 245 and 246 provided in the respective tooth support portions 242 so as to be aligned in the direction of a rotation drum rotation axis X1 (hereinafter, simply referred to as a drum rotation axis X1) of the drive shaft 240; the tooth holding mechanism 260 is provided on one lateral outer side of the rotary drum 227 and has an auxiliary rotary body 261 having a pentagonal shape as viewed from the side of the travel machine body.

The pair of support arms 226 and 226 of the rotary drum 227 are vertically swung about the axial center Y1 of the connecting shaft 251 relative to the harvester frame 222 by the hydraulic cylinder 250 connected to one of the pair of support arms 226 and the harvester frame 222, whereby the rotary drum 227 is raised and lowered to a lowered working state and a raised non-working state.

Fig. 25 is a side view of the rotary drum 227 in a lowered operation state on the low position side. As shown in the drawing, when the pair of left and right support arms 226 and 226 are lowered so that the lower end side of the rotary drum 227 is positioned near the ground G, the rotary drum 227 is in a lowered operation state on the low position side. Thus, by the rotation of the drive shaft 240, the rotary drum 227 rotates about the drum rotation axis X1, and the teeth 245 and 246 of the respective tooth support portions 242 rotate about the drum rotation axis X1 in the rotation direction a. The teeth 245 and 246 rotate while maintaining the posture of extending downward from the tooth support portion 242 by the tooth holding mechanism 260, and the tips 245a and 246a of the teeth 245 and 246 draw a rotation locus T which moves at a height above the ground lower than the height above the ground H1 of the tip 223a of the crop divider 223 behind the tip 223a of the crop divider 223 and moves at a height above the ground lower than the height above the ground H2 of the tip of the harvesting device 224 in front of the harvesting device 224.

Thus, even if the standing straw falls deeply, the rotating drum 227 can hold the standing straw with high accuracy by the respective teeth 245 and 246 and rake and supply the standing straw to the harvesting device 224 even if there is no standing straw which is not subjected to the action of the divider 223.

Fig. 26 is a side view of the rotary drum 227 in a high-position side lowering operation state. As shown in the drawing, when the pair of right and left support arms 226 and 226 are lowered so that the lower end side of the rotary drum 227 is positioned slightly away from the ground G, the rotary drum 227 is in a lowered operation state on the high position side. Thus, by the rotation of the drive shaft 240, the rotary drum 227 rotates about the drum rotation axis X1, and the teeth 245 and 246 of the respective tooth support portions 242 rotate about the drum rotation axis X1 in the rotation direction a. The teeth 245 and 246 rotate while maintaining the posture of extending downward from the tooth support portion 242 by the tooth holding mechanism 260, and the tips 245a and 246a of the teeth 245 and 246 draw a rotation locus T1, and the rotation locus T1 moves at a height above the ground H1 higher than the ground height of the tip 223a of the crop divider 223 behind the tip 223a of the crop divider 223.

Thus, in the lowered working state on the high position side, the rotating drum 227 can rake and supply the standing straw to the harvesting device 224 while avoiding the contact of the respective teeth 245, 246 with the ground, regardless of the front-rear inclination of the traveling machine body.

As shown in fig. 27, the reel rotation axis X1 is disposed such that, in the lowered operation state of the rotating reel 227, the straight line S passing through the reel rotation axis X1 and the harvesting device 224 becomes a vertical line perpendicular to the upper surface of the harvesting blade of the harvesting device 224, and even if the extension angle of each of the teeth 245 and 246 from the tooth support portion 242 is changed, it is possible to satisfactorily prevent straw from floating from the harvesting device 224 and to supply straw to the harvesting device 224.

That is, the teeth 245, 246 shown by solid lines in fig. 27 represent teeth supported on the tooth support portion 242 at a standard extension angle. The teeth 245 and 246 shown by the broken lines in fig. 27 represent teeth supported in a posture inclined to the backward side as compared with the posture at the standard extension angle. The teeth 245 and 246 shown by the two-dot chain line in fig. 27 indicate teeth supported in a posture inclined toward the forward side compared to the posture of the normal extension angle. As shown by these lines, even if the extension angle of the teeth 245 and 246 from the tooth support portion 242 is changed, the teeth 245 and 246 can be moved above the harvesting device 224 without greatly changing the interval between the tooth ends and the harvesting device 224.

Among the plurality of teeth 245 and 246 supported by the respective tooth support portions 242, the teeth 246 located on the lateral end sides of the left and right rotary drums are end side teeth 246, and the teeth 245 located inside the rotary drums are inner side teeth 245. The end teeth 246 and the inner teeth 245 of each tooth support portion 242 are formed of a solid iron round bar material extending from the tooth support portion 242. As shown in fig. 22 and 23, each two of the inner teeth 245 of each tooth support portion 242 is formed of a single round bar material which is bent to have the inner teeth 245 at both end portions and a connecting portion 247 at a middle portion connected to the tooth support portion 242.

The end side teeth 246 have a larger outer diameter than the inner side teeth 245 so that each end side tooth 246 of each tooth support 242 has a greater bending strength than each inner side tooth 245.

That is, at the lateral end side of the rotating drum 227, the standing straw that has not harvested the land is entangled, and the standing straw that has a large reaction force applied to the end-side teeth 246 is raked up. Therefore, the end-side teeth 246 are not bent even if they receive a large reaction force from the straw, and are locked to the standing straw, thereby firmly raking the straw to the harvesting device 224.

On the other hand, the vertical straw on the uncut land is not entangled inside the rotary drum 227, and the vertical straw having a small reaction force applied to the inner teeth 245 is raked up. Therefore, the inner teeth 245 are relatively easily deflected by the reaction force from the standing straw to catch the standing straw, and can quickly rake the straw to the harvesting device 224.

As shown in fig. 21, each inner tooth 245 of each tooth support portion 242 is formed in a bent state in which the tip end side of the inner tooth 245 is positioned on the outer peripheral side of the rotating drum than the tip end side of the tip end side tooth 246.

That is, when the end side teeth 246 of the rotary drum 227 are grounded, the end side teeth 246 have a bending strength larger than that of the inner side teeth 245, and thus are easily deformed or broken. However, even when the rotary drum 227 is grounded, the inner teeth 245 are grounded while the end teeth 246 are not grounded, the inner teeth 245 are easily elastically deformed due to a small bending strength, and the end teeth 246 are not grounded and are not plastically deformed or broken, so that it is difficult for both the inner teeth 245 and the end teeth 246 to be plastically deformed or broken.

As shown in fig. 21, the five tooth support portions 242 are respectively a first tooth support portion 242A, a second tooth support portion 242B, a third tooth support portion 242C, a fourth tooth support portion 242D, and a fifth tooth support portion 242E. As shown in fig. 22, the pair of tooth support portions other than the pair of tooth support portions 242 and 242 formed by the first tooth support portion 242A and the fifth tooth support portion 242E adjacent to each other in the rotation direction of the rotary drum (i.e., the pair of tooth support portions 242 and 242 formed by the first tooth support portion 242A and the second tooth support portion 242B, the pair of tooth support portions 242 and 242 formed by the second tooth support portion 242B and the third tooth support portion 242C, the pair of tooth support portions 242 and 242 formed by the third tooth support portion 242C and the fourth tooth support portion 242D, and the pair of tooth support portions 242 and 242 formed by the fourth tooth support portion 242D and the fifth tooth support portion 242E) correspond to an installation interval D78 (hereinafter, referred to as an inner side tooth group) in the rotation direction of the drum of the inner side teeth 245 in the inner side tooth group of each tooth support portion 242, as shown by an installation interval D1 (hereinafter, referred to as an inner side tooth support portion, referred to as an installation interval D) in the rotation direction of the drum of the inner side teeth 245 in the inner side tooth group of each tooth support portion 242 Tooth attachment interval D1) is shifted from the other by a distance D2 of about 1/2 in the direction of the axis of rotation of the drum.

That is, in a pair of tooth support portions 242 and 242 composed of the first tooth support portion 242A and the second tooth support portion 242B, a pair of tooth support portions 242 and 242 composed of the second tooth support portion 242B and the third tooth support portion 242C, a pair of tooth support portions 242 and 242 composed of the third tooth support portion 242C and the fourth tooth support portion 242D, and a pair of tooth support portions 242 and 242 composed of the fourth tooth support portion 242D and the fifth tooth support portion 242E, the inner teeth 245 of one tooth support portion 242 and the inner teeth 245 of the other tooth support portion 242 are arranged in the circumferential direction of the rotary drum. Thus, even if there are standing straws located between the inner teeth 245 of the tooth support part 242 reaching below the rotating drum 227 without being caught by the inner teeth 245, the rotating drum 227 can cause the inner teeth 245 of the tooth support part 242 reaching next to catch the standing straws and rake the standing straws to the harvesting device 224 in this state.

As shown in fig. 23 and 24, the rotary drum 227 has a tooth cover 253 attached to each of the tooth support portions 242. As shown in fig. 28, each of the tooth covers 253 covers the connecting portion 247 of the inner teeth 245 so that straw chips and the like do not get tangled in the connecting portion 247. Each of the tooth covers 253 is formed of a resin cylinder having a slit 254 formed in the entire length thereof, and is attached to and detached from the tooth support portion 242 through the opened slit 254 by elastically deforming the slit 254 to an open state.

Fig. 21 shows a side view of the tooth holding mechanism 260. Fig. 23 shows a front view of the tooth holding mechanism 260. As shown in these figures, the tooth holding mechanism 260 includes, in addition to the auxiliary rotating body 261: a support 262 supported by the boss 226a of the support arm 226 and having a circular shape when viewed from the side of the rotary drum; and a link 263 disposed across the auxiliary rotator 261 and the drum frame 241 so as to correspond to each of the tooth supporting portions 242.

The support 262 is fitted to the boss 226a at the mounting hole 262a and fixed to a support plate 264 connected to the boss 226a by a fixing bolt 265. The support body 262 has three support rollers 266, and these support rollers 266 are fitted into the circular mounting hole 261a of the auxiliary rotating body 261 and are arranged in a dispersed manner on the circumferential portion of the support body 262. The auxiliary rotating body 261 is pivotally supported on the support body 262 by the three rollers 266, and rotates about an axial center Z eccentrically disposed from the drum rotation axial center X1 at the center of the support body 262. The end of each link 263 on the spool frame side is integrally rotatably connected to the corresponding rotation support shaft 242a of the tooth support portion 242. The end of each link 263 on the auxiliary rotor side is rotatably connected to the top of the auxiliary rotor 261.

Thus, the tooth holding mechanism 260 rotates the auxiliary rotating body 261 around the shaft center Z different from the spool rotation shaft center X1 by the driving force transmitted from the rotation spool 227 via the link 263 in accordance with the rotation of the rotation spool 227, and rotates the rotation support shaft 242a of each tooth support portion 242 by the link 263 to rotate each tooth support portion 242 with respect to the spool frame 241, so that the posture in which the end-side teeth 246 and the inner teeth 245 of each tooth support portion 242 extend downward from the tooth support portion 242 can be maintained regardless of the rotation spool 227.

Fig. 33 is a side view at the tooth arrangement portion of the rotating drum 227 having the second embodiment.

The rotary drum 227 having the structure of the second embodiment has the end side teeth 246 and the inner side teeth 245, and the extension length L1 of the end side teeth 246 from the tooth support part 242 is set shorter than the extension length L2 of the inner side teeth 245 from the tooth support part 242.

That is, when the rotary drum 227 is grounded with the end side teeth 246, the end side teeth 246 have a bending strength larger than that of the inner side teeth 245, and thus are easily deformed or broken. However, even when the rotary drum 227 is grounded, the inner teeth 245 are grounded while the end teeth 246 are not grounded, the inner teeth 245 are easily elastically deformed due to a small bending strength, and the end teeth 246 are not grounded and are not plastically deformed or broken, so that it is difficult for both the inner teeth 245 and the end teeth 246 to be plastically deformed or broken.

Instead of the inner teeth 245 of the above-described embodiment, the inner teeth 245 may be formed in an angular curved state such that the tip end side of the inner teeth 245 is positioned on the outer peripheral side of the rotating drum than the tip end side of the tip end teeth 246. In this case, the object of the present invention can be achieved.