JP7115943B2 - combine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine having a conveying device for joining grain culms harvested in a plurality of rows and collectively conveying them.

BACKGROUND ART Conventionally, a combine is known as a harvesting machine for harvesting and threshing grain culms. Patent Literature 1 discloses this type of combine.

The combine of Patent Document 1 includes a lower right conveying mechanism, a lower left conveying mechanism, and a vertical conveying mechanism that conveys the culms from the location where the culms from the lower right conveying mechanism and the lower left conveying mechanism merge. Equipped with a culm transporter. This grain culm conveying device is provided with a torque sensor for detecting the conveying load of the lower right conveying mechanism and the lower left conveying mechanism located upstream from the joining point of the culms. With this configuration, clogging of grain culms is prevented by stopping the operation of the combine when the conveying load of the lower conveying mechanism detected using the torque sensor is greater than the limit load value.

JP 2015-223092 A

In the culm conveying device, culms are conveyed along an elongated gap. At the junction of grain culms, the gap is set to be relatively large so that even when the amount of grain culms is large, it can pass through. Therefore, when the amount of grain stalks is small, the posture of the stalks tends to collapse at the junction. Therefore, in Patent Document 1, there is a high possibility that clogging occurs due to the collapse of the attitude of the grain culm, and the reaping work is interrupted.

The present invention has been made in view of the above circumstances, and its object is to maintain the posture of merging culms in a suitable manner regardless of the amount of culms, and to prevent clogging of the culms at the junction, To provide a combine harvester capable of improving workability.

Means and Effects for Solving Problems

The problems to be solved by the present invention are as described above. Next, the means for solving the problems and the effects thereof will be described.

According to the viewpoint of this invention, the combine of the following structures is provided. That is, this combine has a reaping part, a threshing device, and a conveying device. The reaping part reaps the culms. The threshing device threshes the culms. The conveying device conveys the culms harvested by the harvesting unit to the threshing device. The transport device includes a plurality of first transport mechanisms, a confluence section, and a second transport mechanism. A plurality of said 1st conveyance mechanisms convey a grain culm. The culms conveyed by the plurality of first conveying mechanisms join and pass through the confluence portion. A said 2nd conveying mechanism conveys the culm which joined in the said confluence|merging part. The merging portion can be deformed according to the amount of culms that merge. The plurality of first transport mechanisms includes a third transport mechanism and a fourth transport mechanism. A said 3rd conveying mechanism conveys the culm harvested by the width direction one side of the said harvesting part. A said 4th conveying mechanism conveys the culm harvested by the width direction other side of the said harvesting part. The confluence portion is formed between the terminal end portion of the third transport mechanism and the terminal end portion of the fourth transport mechanism. The third transport mechanism terminal end is a transport direction terminal end of the third transport mechanism. The fourth transport mechanism terminal end is a transport direction terminal end of the fourth transport mechanism. The third transport mechanism includes rollers and chains. The roller is provided at the terminal end of the third transport mechanism. The chain is wound around the roller. A support shaft member is provided as a center of movement of the roller. The roller can move away from the terminal end portion of the fourth transport mechanism while drawing an arcuate trajectory centering on the support shaft member.

As a result, since the shape of the merging portion can be adjusted according to the amount of culms that join, regardless of the amount of culms, the feeding posture of the merging portion can be preferably maintained, and clogging of the culms can be effectively prevented. can be prevented. By moving the rollers, it is possible to change the shape of the merging portion, and regardless of the amount of the culms to be merged, the culms can pass through without deviation.

In the above combine, it is preferable that the confluence portion is deformable between a shape whose width increases from the upstream side to the downstream side and a shape with a uniform width.

As a result, the amount of harvested culms that can pass through the merging section is increased, and the exit of the merging section does not become narrower than the entrance, so that the culms entering the merging section can be prevented from clogging the outlet.

The combine harvester described above preferably has the following configuration. That is, the third transport mechanism includes an urging member and a movement amount detection section. The biasing member biases the roller in a direction to approach the terminal end of the fourth transport mechanism. The movement amount detection section detects the movement amount of the roller. The biasing member includes a first elastic member and a second elastic member. The second elastic member has a higher elastic modulus than the first elastic member. When the distance between the roller and the terminal end portion of the fourth transport mechanism is smaller than a predetermined distance, the elastic force of the configuration in which the first elastic member and the second elastic member are connected in series acts on the roller. do. The elastic force of the second elastic member acts on the roller when the distance between the roller and the terminal end of the fourth transport mechanism is greater than a predetermined distance. Clogging of the confluence section is detected based on the detection result of the movement amount detection section.

As a result, when the amount of harvested culms joining at the merging portion is small, the gap at the merging portion can be smoothly widened or narrowed according to the amount of grain culms. On the other hand, when the amount of movement of the rollers is close to the threshold value at which clogging is detected by the movement amount detection unit, the movement sensitivity of the rollers to small fluctuations in the amount of harvested grain culms is lowered to prevent erroneous detection of clogging. can be prevented.

The combine harvester described above preferably has the following configuration. That is, the third conveying mechanism has a second roller. A said 2nd roller is provided in the said 3rd conveyance mechanism terminal part downstream from the said roller in the direction which conveys a grain culm. The roller is rotatable around the rotation axis of the second roller.

In this manner, the structure can be simplified by using the axis of the second roller as the rotation center of the roller for deforming the junction. In addition, even if the amount of harvested culms passing through the confluence increases, the position of the second roller does not change, so the gap on the exit side of the confluence 9 can be prevented from narrowing.

The right view of the combine which concerns on one Embodiment of this invention. Top view of the combine. The schematic which shows the culm conveying apparatus with which a combine is provided. The enlarged perspective view which shows the shape of a confluence|merging part when there are few harvested grain culms. (a) The perspective view which shows the structure of the track|orbit guide part of a lower left conveyance mechanism, and an adjustment mechanism. (b) The side view which shows the structure of a track|orbit guide part and an adjustment mechanism. FIG. 4 is an enlarged perspective view showing the structure of an extendable rod; The enlarged perspective view which looked at the track|orbit guide part etc. from the bottom face side. The enlarged perspective view which shows the shape of a confluence|merging part when there are many harvested grain culms. 4 is a graph showing the relationship between the amount of movement of the roller and the biasing force of the spring; The enlarged perspective view which shows the structure of the left lower part conveyance mechanism of 2nd Embodiment. The perspective view which shows the structure of the track|orbit guide part and adjustment mechanism in 2nd Embodiment. FIG. 4 is a partial perspective view of the lower left transport mechanism as seen from the bottom side; The enlarged perspective view which shows the shape of the confluence|merging part when there are many harvested grain culms in a left lower part conveyance mechanism. The side view which shows the structure of a track|orbit guide part and an adjustment mechanism. FIG. 5 is a partial perspective view for explaining an operation for releasing the rotation lock of the base arm; FIG. 16 is a partial perspective view showing a state in which the base arm is rotated from the state shown in FIG. 15;

Next, embodiments of the present invention will be described with reference to the drawings. Drawing 1 is a right side view of combine 100 concerning one embodiment of the present invention. FIG. 2 is a plan view of the combine 100. FIG. FIG. 3 : is schematic which shows the culm conveying apparatus 5 with which the combine 100 is provided.

In the following description, "front" means the direction in which the combine 100 advances during harvesting, and "rear" means the opposite direction. Also, "left" and "right" refer to left and right as seen from the operator sitting in the driver's seat.

As shown in FIG.1 and FIG.2, the combine 100 of this embodiment is comprised as what is called a self-threshing combine. The combine 100 mainly includes a traveling body 1 supported by a pair of left and right traveling crawlers 2 and a harvesting device (reaping section) 3 arranged in front of the traveling body 1 .

The harvesting device 3 is attached to the front portion of the traveling body 1 via a harvesting frame 30 so as to be able to move up and down. In this embodiment, the reaping device 3 is for reaping six rows, and can reap six rows of culms at the same time. The reaping device 3 includes a reaping blade device 31 , a grain culm raising device 32 , a grain culm conveying device (conveying device) 5 , and a cutting body 33 .

The cutting blade device 31 is arranged below the cutting frame 30 . The cutting blade device 31 has a cutting blade that reciprocates to cut the base of uncut grain stalks in a field.

A culm raising device 32 is arranged in front of the reaping frame 30 to raise uncut culms in the field. The culm lifting device 32 includes a lifting case 61 , a star wheel 62 and a raking belt 63 .

As shown in FIG. 2, the raising case 61 has a plurality of raising tines for raising the uncut culms that have entered between the adjacent stems 33 . As shown in FIG. 1 , the star wheel 62 and the raking belt 63 are arranged at the lower rear portion of the raising case 61 . The star foil 62 and the raking belt 63 rake backward the root side of the uncut culms erected by the raising case 61 . Then, the root side of the uncut culm that has been rake-in is cut by the cutting blade device 31 shown in FIG.

The grain culm conveying device 5 is arranged between the grain culm raising device 32 and the front end portion (feed start end side) of the feed chain 11 described later. The grain culm conveying device 5 conveys harvested grain culms cut by the cutting blade device 31 .

The culm conveying device 5 includes an upstream conveying mechanism (first conveying mechanism) 51 and a vertical conveying mechanism (second conveying mechanism) 52, as shown in FIG. The upstream conveying mechanism 51 is positioned upstream in the direction of conveying harvested culms, and the vertical conveying mechanism 52 is positioned downstream.

The upstream transport mechanism 51 includes a lower left transport mechanism (third transport mechanism) 7, a lower central transport mechanism 53, a lower right transport mechanism (fourth transport mechanism) 8, an upper left transport mechanism 54, and an upper central transport mechanism. 55 and an upper right transport mechanism 56 .

The lower left transport mechanism 7, the lower central transport mechanism 53, and the lower right transport mechanism 8 are all provided with chains 67, 65, 68 for transporting harvested grain culms. The lower left conveying mechanism 7 conveys the roots of the harvested grain culms of the left two rows of the six rows harvested by the combine 100 obliquely rearward to the right. The central lower conveying mechanism 53 conveys the base of the harvested culms of the central two rows diagonally rearward to the right so as to join the culms conveyed by the lower right conveying mechanism 8 . The lower right conveying mechanism 8 conveys the base of the right two rows of harvested grain culms obliquely rearward to the left.

The lower right transport mechanism 8 merges the two left and two center harvested culms at the downstream side thereof with the two right harvested culms transported by the left lower transport mechanism 7 . , the paper is transported obliquely backward to the left.

In the conveying direction of harvested grain culms, a left lower conveying mechanism terminal portion (third conveying mechanism terminal portion) 70 that is the downstream end portion of the left lower conveying mechanism 7 and a right downstream end portion of the lower right conveying mechanism 8 lower transport mechanism terminal end (fourth transport mechanism terminal end) 80 are arranged to approach each other and face each other. At this portion, a confluence portion 9 is formed where four harvested grain culms and two harvested grain culms join together. The confluence portion 9 is a gap between the chain 67 running at the lower left transport mechanism terminal end 70 and the chain 68 running at the lower right transport mechanism terminal end 80 .

The vertical transport mechanism 52 has a chain 69 for transporting the harvested culms. The vertical conveying mechanism 52 receives from the merging section 9 the roots of the reaping grain culms conveyed and joined by the lower left conveying mechanism 7 and the lower right conveying mechanism 8 . The vertical conveying mechanism 52 conveys the harvested culms to the front end of the feed chain 11 located obliquely upward in the rear.

A vertical transport guide body 57 as a clamping guide member is provided so as to face the outer peripheral side of the chain of the vertical transport mechanism 52 . The vertical transport guide body 57 can hold the roots of the harvested grain culms for six rows between itself and the vertical transport mechanism 52 .

The upper left transport mechanism 54, the upper central transport mechanism 55, and the upper right transport mechanism 56 all have tines for transporting harvested grain culms. The upper left conveying mechanism 54, the upper central conveying mechanism 55, and the upper right conveying mechanism 56 collect the tips of the harvested grain culms of six rows and convey them obliquely backward to the left.

The dividing body 33 is arranged in a convex shape in the lower front part of the grain raising device 32, and divides the uncut grain culms of the field one by one for six rows.

With this configuration, the combine 100 can drive the traveling crawler 2 by the engine 50 to move in the field, and drive the reaping device 3 to continuously reap the uncut culms in the field.

The traveling machine body 1 includes a threshing device 12 having a feed chain 11 and a grain tank 13 for storing grains after threshing. The threshing device 12 and the grain tank 13 are arranged side by side, with the threshing device 12 on the left side and the grain tank 13 on the right side. The grain tank 13 is provided with a grain discharge auger 14 for discharging the grain stored inside thereof to the outside of the machine body.

The threshing device 12 includes a threshing drum 21 for threshing culms, a swing sorting disc 22, a winnow fan 23, a processing drum 24, and a dust exhaust fan 25. - 特許庁The rocking sorting board 22 is configured as a rocking sorting mechanism for sorting out the grains falling below the handling cylinder 21 . A winnowing fan 23 supplies sorting air to the swing sorting board 22 . The processing cylinder 24 reprocesses the threshing effluent removed from the rear of the processing cylinder 21 . The dust exhaust fan 25 exhausts dust from the rear portion of the swing sorting board 22 to the outside of the machine.

With the above configuration, the base side of the harvested culms sent from the harvesting device 3 by the culm conveying device 5 is transferred to the front end side of the feed chain 11 . Then, the feed chain 11 is conveyed to introduce the tip side of the grain culm into the threshing device 12 and thresh it by the threshing cylinder 21 .

A straw removal chain 26 is arranged on the rear end side (feed end side) of the feed chain 11 . The straw taken over from the rear end side of the feed chain 11 to the straw removal chain 26 is discharged to the rear of the traveling machine body 1 in a long state, or is discharged by a straw removal cutter 27 provided on the rear side of the threshing device 12. After being cut to an appropriate length, it is discharged rearwardly and downwardly of the traveling machine body 1 . In addition, the waste straw means the culm from which grains have been shed.

Below the rocking sorting board 22, there are a first conveyor 28 for taking out the grains sorted by the rocking sorting board 22 (the first sorted material), and a conveyor 28 for taking out the second sorted material such as grains with stems. A number conveyor 29 is provided. In this embodiment, the first conveyor 28 and the second conveyor 29 are arranged in order from the front side of the traveling machine body 1 in the direction of travel, and are arranged in the horizontal direction of the machine body on the upper surface side of the traveling machine body 1 in a side view.

The oscillating sorting board 22 is configured to oscillate sort out (gravity sorting) the threshed grains dropped below the threshing cylinder 21 . The grains (most sorted grains) that have fallen from the swing sorting disc 22 fall to the first conveyor 28 after the dust in the grains is removed by the sorting wind from the winnow fan 23 . A vertically extending first grain hoisting tube 40 is connected to the end portion of the first conveyor 28 that protrudes outward from one side wall (the right side wall in the embodiment) of the threshing device 12 near the grain tank 13 . . The grains taken out from the first conveyor 28 are carried into the grain tank 13 and stored by the first grain-hoisting conveyor (not shown) in the first-grain-hoisting tube 40 .

The rocking sorting board 22 uses rocking sorting (specific gravity sorting) to transfer the second sorted material such as grains with branch stems (reduced and reprocessed material for re-sorting mixed with grains and straw waste) to the second conveyor. 29 is configured to drop. The second sorted material taken out by the second conveyor 29 is returned to the upper surface side of the swing sorting board 22 via the second return conveyor 41 and the second processing unit 42 and sorted again. Straw waste, dust, and the like in the sheds from the handling drum 21 are discharged from the rear part of the traveling machine body 1 toward the field by the sorting wind from the winnowing fan 23 .

Next, with reference to FIGS. 3 to 8, the configuration of the confluence section 9 will be described in detail. FIG. 4 is an enlarged perspective view showing the shape of the confluence portion 9 when there are few harvested grain culms. 5A and 5B are a perspective view and a side view showing the configuration of the track guide portion 72 and the adjustment mechanism 81 of the lower left transport mechanism 7. FIG. FIG. 6 is an enlarged perspective view showing the configuration of the telescopic rod 84. As shown in FIG. FIG. 7 is an enlarged perspective view of the track guide portion 72 and the like viewed from the bottom side. 4 is a partial perspective view showing the back surface of the confluence portion 9. FIG. FIG. 8 is an enlarged perspective view showing the shape of the confluence portion 9 when there are many harvested culms.

Conventionally, as shown in Patent Document 1, the shape of the confluence portion of the grain culm conveying device has been constant. Therefore, in order to smoothly pass through the confluence even when there are many reaping grain culms, it has been necessary to increase the size of the gap at the confluence, assuming the case of harvesting the maximum number of rows.

On the other hand, a combine harvester may harvest the maximum number of rows or may harvest only one row left uncut. Also, the amount of culms to be harvested changes depending on the traveling speed of the traveling machine body 1 and the like. When a small amount of harvested culms is conveyed into a large gap in the merging portion, the posture of the harvested culms tends to change, which causes clogging or the like.

In this regard, the confluence portion 9 of the combine 100 of the present embodiment is formed so as to be deformable according to the amount of passing harvested grain culms, as shown in FIGS. 4 and 8 .

When there is no harvested culm transported to the confluence section 9 or when there are only a few culms, the confluence section 9 has a narrow upstream side (inlet portion P) as shown in FIG. It has a wider shape. When the inlet portion P of the confluence portion 9 is narrowed to the limit, the width of the inlet portion P is determined so that even a small amount of harvested stalks can be retained satisfactorily. Therefore, even if a small amount of harvested grain culms are conveyed to the merging section 9, the harvested grain culms are well sandwiched between the lower left conveying mechanism 7 and the lower right conveying mechanism 8 and held, and are not displaced downstream. can be transported to

When the harvested culms conveyed to the merging section 9 increase, the pressure of the passing harvested culms spreads the upstream side (inlet portion P) of the merging section 9 from the state shown in FIG. When the passing amount of harvested culms is close to the assumed upper limit, as shown in FIG. 8, the width of the upstream side of the confluence portion 9 is almost the same as the width of the downstream side. At this time, the confluence portion 9 has a shape with a uniform width.

Considering that the reaping device 3 of the present embodiment cuts 6 rows, the upper limit of the passing amount of harvested grain culms is an amount obtained by adding a certain margin to 6 rows (for example, 7 rows of harvested culms ). Therefore, even when cutting 6 rows, which is the maximum number of rows, clogging of the harvested grain culms does not occur in the merging portion 9, and the lower left conveying mechanism terminal portion 70 and the lower right conveying mechanism terminal portion 80 allow smooth cutting. can be transported downstream.

The confluence portion 9 deforms between a shape in which the width increases from the upstream side to the downstream side as shown in FIG. 4 and a shape in which the width is constant as shown in FIG. The details of the configuration for deforming the merging portion 9 in conjunction with the amount of harvested grain culms will be described later.

When the width of the inlet portion P of the confluence portion 9 is greatly widened, as shown in FIG. 8, the culm passage in the confluence portion 9 has a uniform width. In other words, in the above state, the trajectory of the chain 67 at the lower left transport mechanism terminal end 70 and the trajectory of the chain 68 at the lower right transport mechanism terminal end 80 are parallel to each other. As a result, the outlet of the merging portion 9 does not become narrower than the inlet, and the harvested grain culms entering the merging portion 9 can be prevented from being clogged on the outlet side.

Next, a configuration for deforming the confluence portion 9 will be described. In the combine 100 of the present embodiment, the left lower transport mechanism terminal end portion 70 positioned on one side of the merging portion 9 rotates away from the lower right transport mechanism terminal end portion 80 . As a result, the running route of the chain 67 is changed, and the merging portion 9 is deformed.

The lower left transport mechanism 7 includes a chain 67, a track guide portion 72, and an adjustment mechanism 81, as shown in FIG. 4 and the like.

The chain 67 is endless and driven to circulate in the lower left transport mechanism 7 . The chain 67 running at the lower left transport mechanism terminal end 70 is arranged to face the chain 68 running at the lower right transport mechanism terminal end 80 across the confluence portion 9 which is a gap. At the confluence section 9 , the root side of the harvested grain culm is conveyed while being sandwiched between both sides by the chains 67 and 68 .

The track guide portion 72 guides the track of the chain 67 at the left lower transport mechanism end portion 70 of the left lower transport mechanism 7 . The track guide portion 72 includes a roller bracket 73 and two rollers 75 and 76 .

The roller bracket 73 includes a base plate 77 and a cover plate 78, as shown in FIG. 5(a) and the like. The roller bracket 73 is rotatably supported by the tip of a base arm 83 provided in an adjustment mechanism 81, which will be described later.

4 and 5A are diagrams of the track guide portion 72 and the like viewed from above, and FIG. 7 is a diagram of the track guide portion 72 and the like viewed from below. As shown in FIG. 7, the base plate 77 is configured as a generally triangular plate-like member. As shown in FIGS. 5(a) and 5(b), the cover plate 78 is configured as a plate-like member bent into a crank shape. By fixing the cover plate 78 to the upper side of the base plate 77, the roller bracket 73 having an internal space sandwiched between the base plate 77 and the cover plate 78 is configured. This internal space is open on the side near the lower right transport mechanism terminal end 80 .

The two rollers 75 and 76 are arranged in the inner space of the roller bracket 73 and are rotatably supported by the roller bracket 73 . Although the chain 67 is not shown in FIG. 5, the chain 67 is wound around the rollers 75 and 76 as shown in FIG. 4 and the like. The portion where the chain 67 is stretched between the two rollers 75 and 76 constitutes the lower left transport mechanism terminal end portion 70 facing the lower right transport mechanism terminal end portion 80 .

In the following description, in order to specify each of the two rollers 75 and 76, the roller located upstream in the conveying direction of the harvested grain culms will be referred to as the upstream roller 75, and the roller located downstream is sometimes called a downstream roller (second roller) 76 .

As shown in FIG. 5( a ), a regulating member 74 is fixed at an appropriate position on the roller bracket 73 . Furthermore, as shown in FIGS. 5(b) and 7, a transmission pin 79 is fixed to the lower surface of the base plate 77 of the roller bracket 73. As shown in FIG. Both the regulating member 74 and the transmission pin 79 rotate integrally with the roller bracket 73 .

The adjusting mechanism 81 is attached to a fixed plate 96 fixed to a frame 95, as shown in FIG. 5(a) and the like. The adjustment mechanism 81 includes a base arm (base member) 83 , a support shaft bracket 82 , an extendable rod 84 and a spring (biasing member) 85 .

The base arm 83 is formed in a U shape so as to bypass the telescopic rod 84 and the spring 85 . One end of the base arm 83 is rotatably supported by a fixed plate 96 via a rotating pin 86 . A support shaft bracket 82 is fixed to the other end of the base arm 83 .

The support shaft bracket 82 is configured as a laterally U-shaped member. The support shaft bracket 82 rotatably supports the roller bracket 73 of the track guide portion 72 via a support shaft member 89 . The support shaft member 89 is arranged parallel to the rotation shafts of the rollers 75 and 76 .

The telescopic rod 84 connects the base arm 83 and an appropriate location of the track guide portion 72 . One longitudinal end of the telescopic rod 84 is rotatably connected to the middle portion of the base arm 83 , and the other longitudinal end is rotatably connected to the roller bracket 73 of the track guide portion 72 .

As shown in FIGS. 5A and 6, the telescopic rod 84 includes a tubular member 84a and a rod member 84b. Both the cylinder member 84a and the rod member 84b are formed in a linear shape and are elongated. A shaft hole is formed in the cylindrical member 84a, and the rod member 84b is inserted into the shaft hole. The rod member 84b is slidable in the longitudinal direction with respect to the tubular member 84a, and thereby the length of the telescopic rod 84 can be changed. The contraction limit of the telescopic stroke of the telescopic rod 84 is defined by the contact of the rod member 84b with the end wall of the shaft hole of the cylindrical member 84a.

The spring 85 is composed of a compression coil spring, and its coil portion is arranged outside the extension rod 84 . The expansion rod 84 expands and contracts in conjunction with expansion and contraction of the spring 85 . Since the spring 85 (extendable rod 84) is arranged in a contracted state in the axial direction, an elastic force in the direction of extending the extendable rod 84 acts as an urging force. This elastic force is transmitted from the extensible rod 84 to the track guide portion 72 to rotate the track guide portion 72 in the direction of narrowing the width of the inlet portion P of the junction portion 9 . As a result, the harvested grain culms can be sandwiched and held between the lower left transport mechanism terminal end portion 70 and the lower right transport mechanism terminal end portion 80 at the confluence portion 9 .

The spring 85 has a configuration in which two springs having different spring constants are arranged side by side in the axial direction. A first spring 85a (first elastic member) with a relatively small spring constant is arranged on the side closer to the track guide portion 72, and a second spring 85b (second elastic member) with a relatively large spring constant is arranged on the side closer to the track. It is arranged on the far side from the guide part 72 . However, the first spring 85a and the second spring 85b may be reversely arranged. The spring constant can also be called the elastic modulus.

The trajectory guide portion 72 rotates within a predetermined angular range around a support shaft member 89 attached to the support shaft bracket 82 .

The stroke of the trajectory guide portion 72 on one side in the rotational direction (specifically, the side on which it rotates under the biasing force of the spring 85) is It is defined by contacting the axial end of the stop bolt 87 . The state in which the regulating member 74 is in contact with the stop bolt 87 corresponds to the shape of the confluence portion 9 in FIG. The stop bolt 87 is provided so as to be screw-movable with respect to the base arm 83 by rotating it. Thereby, the lower limit of the variation range of the width of the inlet portion P of the confluence portion 9 can be adjusted.

The stroke of the track guide portion 72 on the other side in the rotational direction is defined by the contraction limit of the extension stroke of the telescopic rod 84 described above. However, before the telescopic rod 84 reaches the limit in the contraction direction, when the trajectory guide part 72 rotates even slightly from the state shown in FIG.

As the track guide portion 72 rotates, the upstream roller 75 can move away from the lower right transport mechanism terminal portion 80 . The movement of the upstream roller 75 widens the gap of the inlet portion P, and changes the shape of the confluence portion 9 .

Since the support shaft member 89 is arranged between the rotation centers of the rollers 75 and 76, the upstream roller 75 draws an arc locus in the direction away from the lower right conveying mechanism end portion 80, as indicated by the thick arrow in FIG. At the same time, the downstream roller 76 moves along an arc in a direction toward the lower right transport mechanism terminal end 80 . However, the support shaft member 89 is arranged at a position closer to the center of the downstream roller 76 than the point that bisects the center of rotation of the rollers 75 and 76 . Accordingly, when the roller bracket 73 rotates, the upstream roller 75 moves more than the downstream roller 76 . Therefore, as the roller bracket 73 rotates, the upstream roller 75 can be moved toward or away from the lower right conveying mechanism end portion 80 with a good stroke.

The position of the support shaft member 89, which is the center of rotation of the roller bracket 73, does not coincide with the center of rotation of the upstream roller 75 or the center of rotation of the downstream roller 76, and is arranged between the two centers. Therefore, the tension of the chain 67 acts on the roller bracket 73 to move the upstream roller 75 away from the lower right transport mechanism terminal end 80 , and the tension of the chain 67 moves the downstream roller 76 away from the lower right transport mechanism terminal end 80 . and the moment acting on the roller brackets 73 to separate them cancel each other out. As a result, the track guide portion 72 is less likely to rotate due to the tension of the chain 67, and the shape of the junction portion 9 can be stabilized.

The trajectory guide portion 72 and the adjustment mechanism 81 are attached to the fixed plate 96 so as to be rotatable around the rotation pin 86 . In normal use, the base arm 83 or a member fixed thereto is fixed to the frame or the like with a fixing bolt (not shown). Therefore, the base arm 83 does not rotate from the position shown in FIG. 4 and the like. On the other hand, for example, when severe clogging of harvested culms occurs in the confluence portion 9, the fixing bolt is removed and the base arm 83 is rotated around the rotation pin 86 from the position shown in FIG. By doing so, the adjustment mechanism 81 and the track guide portion 72 can be rotated obliquely upward and rearward. As a result, the merging portion 9 can be largely opened to facilitate maintenance such as removal of harvested grain culms.

Next, the action of the two springs 85a and 85b that constitute the spring 85 will be described.

In the state shown in FIG. 4 where the gap at the entrance portion P of the confluence portion 9 is the smallest, the amount of contraction of the spring 85 is small. As the gap of the inlet portion P increases from the state shown in FIG. 4, the spring 85 contracts.

The spring 85 functions as a composite spring of a first spring 85a and a second spring 85b having different spring constants until the gap of the inlet portion P increases from the state of FIG. 4 to a predetermined size. At this time, the spring constant of the spring 85 as a whole can be obtained according to a known formula for combination springs connected in series, and is smaller than the spring constant of the first spring 85a.

When the gap of the inlet portion P becomes large to a certain extent, the spring wires of the coil portion of the first spring 85a come into contact with each other and cannot contract any further. In this state, the spring constant of the spring 85 as a whole matches the spring constant of the second spring 85b. After that, only the portion of the second spring 85b is contracted, so that the gap of the inlet portion P is increased, and eventually the state shown in FIG. 8 is reached.

In the graph of FIG. 9, the relationship between the amount of movement of the upstream roller 75 from the state of FIG. This graph also shows the amount of movement M1 at which the first spring 85a reaches its contraction limit. When the amount of movement of the upstream roller 75 exceeds the amount of movement M1 described above and enters the region where only the second spring 85b expands and contracts, the rate of increase in the urging force with respect to the increase in the gap of the inlet portion P becomes equal to that of the first spring 85a. Both of the second springs 85b are larger than the stretchable area.

Next, a configuration for detecting the size of the gap at the inlet portion P of the confluence portion 9 will be described.

The combine 100 is provided with a potentiometer (movement amount detection unit) 90 as shown in FIGS. 5B and 7 . This potentiometer 90 can detect the rotation angle of the track guide portion 72 (in other words, the amount of movement of the upstream roller 75).

The potentiometer 90 is attached to a frame 95 as shown in FIG. 5(b). The potentiometer 90 has a rotatable detection lever 91 and outputs an electrical signal corresponding to the rotation angle of the detection lever 91 . The detection lever 91 is arranged so as to be able to contact the transmission pin 79 and is biased by a spring (not shown) so as to rotate toward the transmission pin 79 . As a result, the detection lever 91 is always in contact with the transmission pin 79 .

When the amount of harvested culms passing through the confluence portion 9 increases, the track guide portion 72 rotates. Along with this, the transmission pin 79 fixed to the roller bracket 73 rotates, and in this process, the transmission pin 79 pushes the detection lever 91 to rotate it. By detecting the angle of the detection lever 91, the potentiometer 90 can detect the rotation angle of the track guide portion 72 (that is, the amount of movement of the upstream roller 75).

Next, detection of clogging in the merging section 9 in the combine 100 of this embodiment will be described with reference to FIG. 9 and the like.

The combine 100 of this embodiment is provided with a control section consisting of a computer. This controller monitors the electrical signal output by the potentiometer 90 . When the potentiometer 90 detects that the amount of movement of the upstream roller 75 has reached a predetermined value or more, the control unit determines that clogging has occurred in the confluence unit 9, and displays the display located near the driver's seat. Control for displaying a warning, control for automatically stopping the engine 50, and the like are performed as necessary.

FIG. 9 shows threshold values for determining whether or not the confluence section 9 is clogged in the control section. This threshold value corresponds to the shape of the confluence portion 9 shown in FIG. The amount of movement of the upstream roller 75 corresponding to this threshold is the region where the first spring 85a has reached the contraction limit and the spring constant of the spring 85 matches the spring constant of the second spring 85b (specifically, the first 1 spring 85a is included in the region larger than the moving amount M1 of the upstream roller 75, which is the contraction limit.

Consider a case where the amount of harvested culms passing through the confluence portion 9 per unit time increases from zero in this configuration. As the passing amount of harvested culms increases, the chain 67 is pushed, the upstream roller 75 moves from the state shown in FIG. Accordingly, the spring 85 is compressed. At this time, the spring 85 functions as a compound spring in which the first spring 85a and the second spring 85b are connected in series. The first spring 85a and the second spring 85b are elastically deformed at the same time with deformation amounts according to their respective spring constants.

When the amount of movement of the upstream roller 75 reaches a predetermined value, the first spring 85a can no longer contract, and only the second spring 85b contracts. After this point, the rate of increase in the biasing force of the spring 85 increases as the gap of the inlet portion P increases.

The state of FIG. 8 is a state in which the amount of movement of the upstream roller 75 is equal to the threshold at which clogging of harvested culms is determined by the control unit. If the upstream roller 75 moves further than this, the controller will determine that a jam has occurred.

The region in which the rate of increase of the biasing force of the spring 85 is large is defined to include the boundary conditions of FIG. Therefore, even when the amount of harvested culms passing through the confluence section 9 per unit time increases to near the limit of causing clogging, the harvested culms are conveyed while strongly resisting the pressure that causes the culms to widen the gap. can do.

The measurement of the gap size by the potentiometer 90 is used to inform the operator of the amount of culm harvest passing through the junction 9 as well as to determine clogging. From the viewpoint of accurately detecting the passing amount of the harvested culm by the potentiometer 90, it is preferable that the upstream roller 75 moves to some extent sensitively to the increase or decrease in the passing amount of the harvested culm.

The amount of harvested grain culms passing through the junction 9 per unit time is not constant due to the density of the grain culms in the field, etc., and small variations occur. In the graph of FIG. 9, as a comparative example, the spring 85 consists of one spring having a spring constant equal to that of the first spring 85a and one spring having a spring constant equal to that of the second spring 85b. If and are shown.

When the passing amount of harvested culms per unit time increases close to the limit at which clogging occurs, as in the case of "weak spring only" in FIG. When the upstream roller 75 moves due to the movement of the upstream roller 75, the boundary is instantaneously exceeded due to the influence of fine variations, even though it should not be substantially determined as clogging, and the control unit determines that clogging has occurred. There is a risk that it will be lost. On the other hand, if the biasing force is increased over the entire area as in the case of "only a strong spring" in FIG. When the passing amount is small, it becomes difficult to detect the passing amount with high accuracy by the potentiometer 90 .

In this regard, in this embodiment, when the gap is widened to a state close to the state of FIG. 8, the rate of increase in the biasing force of the spring 85 with respect to the increase in the gap is greater than when the gap is not so large. ing. Therefore, in the vicinity of the threshold value for determining the presence or absence of clogging, the movement sensitivity of the upstream roller 75 with respect to minute variations in the amount of harvested grain culms becomes dull, so erroneous detection of clogging can be prevented.

As described above, the combine 100 of the present embodiment includes the reaping device 3, the threshing device 12, and the culm conveying device 5. The reaping device 3 reaps the culms. The threshing device 12 threshes the culms. The culm conveying device 5 conveys the culm harvested by the reaping device 3 to the threshing device 12 . The culm conveying device 5 includes a lower left conveying mechanism 7 , a lower right conveying mechanism 8 , a central lower conveying mechanism 53 , a merging portion 9 , and a vertical conveying mechanism 52 . The lower left transport mechanism 7, the lower right transport mechanism 8, and the lower central transport mechanism 53 transport culms. The culms conveyed by the lower left conveying mechanism 7, the lower right conveying mechanism 8, and the central lower conveying mechanism 53 merge and pass through the merging portion 9. The central lower transport mechanism 53 transports the culms that have merged at the merging section 9 . The merging portion 9 can be deformed according to the amount of culms to be merged.

As a result, the shape of the merging portion 9 can be adjusted according to the amount of grain culms to be merged, so that the conveying posture of the merging portion 9 can be preferably maintained regardless of the amount of grain culms, and clogging of grain culms can be prevented. can be effectively prevented.

Moreover, in the combine 100 of this embodiment, the lower left conveying mechanism 7 and the lower right conveying mechanism 8 are included in the plurality of conveying mechanisms for conveying the culms. The lower left transport mechanism 7 transports the culms harvested on the left side in the width direction of the harvesting device 3 . The lower right transport mechanism 8 transports the culms harvested on the right side in the width direction of the harvesting device 3 . The confluence portion 9 is formed between the left lower transport mechanism terminal end portion 70 and the right lower transport mechanism terminal end portion 80 . The lower left transport mechanism end portion 70 is the end portion of the lower left transport mechanism 7 in the transport direction. The lower right transport mechanism end portion 80 is the transport direction end portion of the lower right transport mechanism 8 . The lower left transport mechanism 7 includes upstream rollers 75 and chains 67 . The upstream roller 75 is provided at the lower left transport mechanism terminal end portion 70 . The chain 67 is wound around the upstream roller 75 . The upstream roller 75 is movably installed with respect to the lower right conveying mechanism end portion 80 .

Thus, by moving the upstream roller 75, the shape of the merging portion 9 can be changed, and regardless of the amount of the culms to be merged, the culms can pass through without deviation.

Moreover, in the combine 100 of this embodiment, the confluence|merging part 9 can deform|transform between the shape which has a width|variety which becomes wide as it goes from an upstream to a downstream, and the shape which has uniform width.

As a result, the amount of harvested culms that can pass through the merging section 9 is increased, and the outlet of the merging section 9 is prevented from becoming narrower than the inlet, so that the culms entering the merging section can be prevented from clogging the outlet.

Moreover, in the combine 100 of this embodiment, the lower left transport mechanism 7 includes a spring 85 and a potentiometer 90 . The spring 85 urges the upstream roller 75 in a direction to approach the lower right transport mechanism terminal end 80 . A potentiometer 90 detects the amount of movement of the upstream roller 75 . The spring 85 includes a first spring 85a and a second spring 85b. The second spring 85b has a higher elastic modulus than the first spring 85a. When the distance between the upstream roller 75 and the lower right transport mechanism terminal end portion 80 is smaller than a predetermined distance (that is, the distance corresponding to the movement amount M1 described above), the upstream roller 75 has the first spring 85a and the first spring 85a. The elastic force of the spring 85, which is a composite spring in which two springs 85b are connected in series, acts. When the distance between the upstream roller 75 and the lower right transport mechanism end portion 80 is greater than the predetermined distance, the elastic force of the second spring 85 b acts on the upstream roller 75 . Clogging of the confluence section 9 is detected based on the detection result of the potentiometer 90 .

As a result, when the amount of harvested culms joining at the merging section 9 is small, the gap of the merging section 9 can be smoothly widened or narrowed according to the amount of harvested grain culms. On the other hand, when the amount of movement of the upstream roller 75 approaches the threshold at which clogging is detected by the potentiometer 90, the movement sensitivity of the upstream roller 75 to small fluctuations in the amount of harvested grain culms is reduced to prevent clogging. erroneous detection can be prevented.

Next, a second embodiment will be described. The position of the support shaft member 89 (the center of rotation of the track guide portion 72) described in the above-described first embodiment is not limited, and can be appropriately changed as necessary. For example, as in a second embodiment described below, the support shaft member 89 may be arranged so as to coincide with the axial center of the downstream roller 76 .

2nd Embodiment is described mainly with reference to FIGS. 10-14. FIG. 10 is an enlarged perspective view showing the configuration of the lower left transport mechanism 7x of the second embodiment. FIG. 11 is a perspective view showing the configuration of the track guide portion 72x and the adjustment mechanism 81 of the second embodiment. FIG. 12 is a partial perspective view of the lower left transport mechanism 7x of the second embodiment as viewed from the bottom side. FIG. 13 is an enlarged perspective view showing the shape of the confluence portion 9 in the lower left transport mechanism 7x of the second embodiment when there are many harvested grain culms. FIG. 14 is a side view showing the configuration of the trajectory guide portion 72x and the adjustment mechanism 81. As shown in FIG.

In the description of this embodiment, the same or similar members as those of the above-described embodiment are denoted by the same reference numerals in the drawings, and description thereof may be omitted. 11 and 14, the chain 67 is omitted.

In the lower left transport mechanism 7x of the present embodiment, the track guide portion 72x further includes a tension roller 45 in addition to the upstream roller 75 and the downstream roller 76, as shown in FIG. 10 and the like.

The tension roller 45 is arranged in the inner space of the roller bracket 73 and rotatably supported by the roller bracket 73 . Although the chain 67 is not shown in FIG. 11, the chain 67 is wound around the tension roller 45 as shown in FIG. 10 and the like.

The tension roller 45 is arranged downstream of the upstream roller 75 and downstream of the downstream roller 76 in the direction in which the chain 67 circulates. The tension roller 45 is arranged at a predetermined distance from the lower left transport mechanism end portion 70 .

The downstream roller 76 of this embodiment is arranged in the inner space of the support shaft bracket 82 as shown in FIG. 11 . The rotation axis of the downstream roller 76 coincides with the axis of the support shaft member 89 . That is, in the track guide portion 72x of the present embodiment, the roller bracket 73 (the upstream roller 75 and the tension roller 45) is a support shaft member that is the rotational axis of the downstream roller 76, as indicated by the thick arrow in FIG. Centering on 89, it is provided so as to be rotatable with respect to the lower right conveying mechanism end portion 80. As shown in FIG.

In the present embodiment, the position of the downstream roller 76 is fixed, and the upstream roller 75 rotates in a direction away from the lower right transport mechanism 8 , thereby widening the gap at the confluence portion 9 . In this embodiment, the outlet of the confluence portion 9 is not narrowed as compared with the above-described first embodiment. Therefore, it is possible to prevent the harvested culms that have entered the merging section 9 from clogging the exit side.

A tension roller 45 is provided in the track guide portion 72x of the present embodiment. Therefore, even when the roller bracket 73 rotates so that the upstream roller 75 is separated from the lower right transport mechanism 8, the tension roller 45 rotates so as to protrude rearward along with this rotation. It can absorb slack.

As shown in FIGS. 11 and 14, a sub-tension roller 46 is further provided in the lower left transport mechanism 7x of the present embodiment. The sub-tension roller 46 is arranged between a support member 47 fixed to the upper portion of the base arm 83 and a portion elongated from the base arm 83 . The sub-tension roller 46 is rotatably supported by the support member 47 and the base arm 83 . The subtension roller 46 is arranged immediately downstream of the tension roller 45 in the direction in which the chain 67 circulates.

The sub-tension roller 46 is arranged outside the chain 67 as shown in FIG. 10 and the like. The chain 67 is wound around the outer side of the tension roller 45 and the inner side of the sub-tension roller 46 so as to pass between the tension roller 45 and the sub-tension roller 46 . Thereby, the tension of the chain 67 can be preferably maintained. However, the sub-tension roller 46 can be omitted.

In this embodiment, the restricting member 74 that defines the rotational stroke of the track guide portion 72x (roller bracket 73) is attached to the lower surface of the base plate 77, as shown in FIG. With the confluence portion 9 shaped as shown in FIG. 10, the restricting member 74 comes into contact with the stop bolt 87 attached to the lower surface of the base arm 83, thereby restricting the rotation of the track guide portion 72x.

The lower left transport mechanism 7x of this embodiment includes an auxiliary fixing plate 35. As shown in FIG. As shown in FIG. 10 , one end of the auxiliary fixing plate 35 is supported by a support shaft member 89 . The auxiliary fixing plate 35 is rotatable with respect to the cover plate 78 around the support shaft member 89 . A lock pin 88 is detachably attached to the other end of the auxiliary fixing plate 35 . An elongated rod-shaped grip portion 99 is fixed to the auxiliary fixing plate 35 .

A second fixing plate 98 is fixed to the second frame 97 . The lock pin 88 fixes the auxiliary fixing plate 35 to the second fixing plate 98 and fixes the support member 47 to the second fixing plate 98 . Thereby, the auxiliary fixing plate 35 and the base arm 83 can be locked so as not to rotate. Since two parts can be locked with one lock pin 88, a simple configuration can be realized.

A plate-shaped protective cover 38 is attached so as to connect the second frame 97 and the fixed plate 96 . The protective cover 38 covers and protects the members forming the adjustment mechanism 81 (for example, the base arm 83 and the like). A base arm 83 of the adjusting mechanism 81 is rotatably supported with respect to the protective cover 38 and the fixed plate 96 via a rotating pin 86 .

A regulating plate 39 is fixed to the protective cover 38 . A regulating roller 37 is rotatably supported by the auxiliary fixing plate 35 . When the auxiliary fixing plate 35 is at the solid line position in FIG. 10 , the outer peripheral surface of the regulating roller 37 is in contact with the regulating plate 39 . This restricting action restricts the rotation of the base arm 83 .

In this embodiment, the operation of wide opening the confluence section 9 for maintenance will be described with reference to FIGS. 15 and 16. FIG. FIG. 15 is a partial perspective view for explaining the operation of releasing the rotation lock of the base arm 83. FIG. FIG. 16 is a partial perspective view showing how the base arm 83 is rotated from the state shown in FIG. 15 and 16, the chain 67 is omitted.

The position of each component indicated by solid lines in FIG. 15 corresponds to FIG. For example, when severe clogging of harvested grain culms occurs in the confluence section 9, the operator removes the lock pin 88, grasps the grip section 99, and rotates the auxiliary fixing plate 35 in the direction of the thick arrow in FIG. . Then, the regulating roller 37 moves away from the regulating plate 39, so that the base arm 83 becomes rotatable about the rotating pin 86. As shown in FIG.

Subsequently, the operator rotates the base arm 83 in the direction of the white arrow in FIG. Along with this, the track guide portion 72x and the adjusting mechanism 81 rotate. As a result, as shown in FIG. 16, the merging section 9 can be largely opened to facilitate maintenance such as removal of harvested grain culms.

After completing the maintenance work, the operator rotates the base arm 83 to its original position (the position shown in FIG. 15). Further, the operator rotates the auxiliary fixing plate 35 from the position indicated by the dashed line in FIG. 15 to the position indicated by the solid line, and returns it to its original position. As a result, the regulating roller 37 comes into contact with the regulating plate 39 and the rotation of the base arm 83 is regulated. Finally, the operator attaches the lock pin 88 to lock the base arm 83 and the auxiliary fixing plate 35 against rotation. As a result, the reaping grain culms can be transported again at the junction 9 .

As explained above, in the combine 100 of this embodiment, the lower left transport mechanism 7x includes the downstream rollers 76 . The downstream roller 76 is provided at the lower left transport mechanism terminal end portion 70 on the downstream side of the upstream roller 75 in the direction of transporting the culm. The upstream roller 75 is installed rotatably around the rotation axis of the downstream roller 76 .

By using the axial center of the downstream roller 76 as the rotation center of the upstream roller 75 for deforming the merging portion 9 in this manner, the structure can be simplified. Further, even if the amount of harvested culms passing through the junction 9 increases, the position of the downstream roller 76 does not change, so the gap on the exit side of the junction 9 can be prevented from narrowing.

Although the preferred embodiments of the present invention have been described above, the above configuration can be modified, for example, as follows.

The track guide portion 72 and the adjusting mechanism 81 may be provided at the lower right transport mechanism end portion 80 or may be provided at the junction of the central lower transport mechanism 53 and the lower right transport mechanism 8 .

The spring 85 may consist of one spring.

As a biasing member that biases the upstream roller 75 or the track guide portion 72, instead of the springs 85 (the first spring 85a and the second spring 85b), for example, rubber or the like may be used.

A potentiometer 90 may be attached to the support shaft bracket 82 to directly detect the rotation of the roller bracket 73 .

Instead of the lock pin 88, the base arm 83 may be rotationally locked/unlocked by attaching/detaching a detachable bolt, for example.

In the second embodiment, the auxiliary fixing plate 35, the regulating roller 37, the regulating plate 39, and the grip portion 99 can be omitted. In this case, the rotation of the base arm 83 is locked only by the lock pin 88 .

The configuration of the merging section 9 described above can also be applied to a reaping section that cuts 5 or less, or 7 or more.

3 Harvesting device (harvesting part)
5 grain culm conveying device 9 confluence section 7 lower left conveying mechanism (first conveying mechanism, third conveying mechanism)
8 lower right transport mechanism (first transport mechanism, fourth transport mechanism)
52 vertical transport mechanism (second transport mechanism)
53 Central lower transport mechanism (first transport mechanism)
67 chain 70 lower left transport mechanism terminal portion (third transport mechanism terminal portion)
75 upstream roller (roller)
85 spring (biasing member)
85a first spring (first elastic member)
85b second spring (second elastic member)
80 lower right transport mechanism terminal (fourth transport mechanism terminal)
90 potentiometer (movement amount detector)
100 combine

Claims (4)

a reaping part for reaping grain culms;
a threshing device for threshing the culms;
a conveying device that conveys the culms harvested by the harvesting unit to the threshing device;
A combine harvester comprising
The conveying device is
a plurality of first transport mechanisms for transporting culms;
a confluence section where the grain culms conveyed by the plurality of first conveying mechanisms merge and pass;
a second transport mechanism for transporting the culms that have joined at the junction;
with
The merging portion is deformable according to the amount of culms that merge ,
The plurality of first transport mechanisms are
a third transport mechanism for transporting the culms harvested on one side in the width direction of the harvesting unit;
a fourth transport mechanism for transporting the culms harvested on the other side in the width direction of the harvesting unit;
including
The confluence section is
a third transport mechanism terminal portion that is a transport direction terminal portion of the third transport mechanism;
a fourth transport mechanism terminal portion that is a transport direction terminal portion of the fourth transport mechanism;
formed between
The third transport mechanism is
a roller provided at the terminal end of the third transport mechanism;
a chain wound around the roller;
with
A support shaft member serving as a center of movement of the roller is provided,
The combine , wherein the roller can draw an arc locus centering on the support shaft member and be separated from the terminal end portion of the fourth conveying mechanism . The combine according to claim 1 ,
The combine is characterized in that the confluence portion is deformable between a shape whose width increases from the upstream side to the downstream side and a shape with a uniform width. The combine according to claim 1 ,
The third transport mechanism is
a biasing member that biases the roller in a direction to approach the terminal end of the fourth transport mechanism;
a movement amount detection unit that detects the movement amount of the roller;
with
The biasing member is
a first elastic member;
a second elastic member having a higher elastic modulus than the first elastic member;
with
When the distance between the roller and the end portion of the fourth transport mechanism is smaller than a predetermined distance, the roller is subjected to an elastic force of a structure in which the first elastic member and the second elastic member are connected in series. death,
When the distance between the roller and the end portion of the fourth transport mechanism is greater than a predetermined distance, the elastic force of the second elastic member acts on the roller,
A combine, wherein clogging of the confluence section is detected based on a detection result of the movement amount detection section. The combine according to any one of claims 1 to 3 ,
The third transport mechanism includes a second roller provided at the end of the third transport mechanism on the downstream side of the roller in the direction of transporting the culm,
A combine, wherein the roller is rotatable about the axis of the second roller.

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