JP2019165717A - Combine harvester - Google Patents

Abstract

To provide a combine harvester capable of suitably retaining a posture of joined grain culms regardless of an amount of grain culms, preventing clogging of grain culms in a joining part, and improving workability.SOLUTION: A combine harvester includes a reaping part, a thresher, and a grain culm conveyance device. The grain culm conveyance device conveys grain culms reaped by the reaping part to the thresher. The grain culm conveyance device includes a left lower conveyance mechanism 7, a right lower conveyance mechanism 8, a central lower conveyance mechanism, a joining part 9, and a vertical conveyance mechanism. The left lower conveyance mechanism 7, the right lower conveyance mechanism 8 and the central lower conveyance mechanism convey grain culms. In the joining part 9, grain culms conveyed by the left lower conveyance mechanism 7, the right lower conveyance mechanism 8 and the central lower conveyance mechanism are joined and pass. The vertical conveyance mechanism conveys grain culms joined in the joining part 9. The joining part 9 is deformable in accordance with an amount of joined grain culms.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a combine equipped with a conveying device that merges and conveys cereals harvested by a plurality of strips.

  Conventionally, a combiner is known as a harvesting machine that harvests and thresh cereal grains. Patent document 1 discloses this kind of combine.

  The combine of patent document 1 is a grain provided with a lower right conveyance mechanism, a lower left conveyance mechanism, and a vertical conveyance mechanism that conveys the cereal from a place where the cereals from the lower right conveyance mechanism and the lower left conveyance mechanism merge.稈 Equipped with a conveyor device. The corn straw transporting device is provided with a torque sensor that detects the transport load of the lower right transport mechanism and the lower left transport mechanism that are upstream from the merging point of the cereal mash. In this configuration, when the transport load of the lower transport mechanism detected using the torque sensor is larger than the limit load value, the combine operation is stopped to prevent clogging of the cereal.

JP 2015-223092 A

  In the corn straw transporting device, the corn straw is transported along an elongated gap. At the merging point of the cereals, the gap is set to be large to some extent so that it can pass even when the amount of cereals is large. Therefore, when the amount of cereals is small, the posture of the cereals 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 posture of the cereal and the mowing operation is interrupted.

  The present invention has been made in view of the above circumstances, and the purpose thereof is to appropriately maintain the posture of the corn flour to join regardless of the amount of the corn straw, to prevent clogging of the corn straw at the merging portion, The object is to provide a combine that can improve workability.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, 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 is provided with a cutting part, a threshing device, and a conveying device. The harvesting unit harvests cereal grains. The threshing device threshs the cereal. The conveying device conveys the cereals harvested by the mowing unit to the threshing device. The transport device includes a plurality of first transport mechanisms, a merging unit, and a second transport mechanism. The plurality of first transport mechanisms transport the cereals. In the merging portion, the cereals conveyed by the plurality of first conveying mechanisms merge and pass. The second transport mechanism transports the cereal mash that has joined at the merging portion. The said junction part can be deform | transformed according to the quantity of the grain mash to join.

  As a result, the shape of the merging portion can be adjusted according to the amount of cereals to be merged. Therefore, in the merging portion, the conveying posture can be suitably maintained regardless of the amount of cereals, and clogging of cereals is effective. Can be prevented.

  The above combine is preferably configured as follows. In other words, the plurality of first transport mechanisms include a third transport mechanism and a fourth transport mechanism. The third transport mechanism transports the cereals harvested on one side in the width direction of the mowing unit. The fourth transport mechanism transports the cereals harvested on the other side in the width direction of the mowing unit. The junction part is formed between the third transport mechanism terminal part and the fourth transport mechanism terminal part. The third transport mechanism end portion is a transport direction end portion of the third transport mechanism. The fourth transport mechanism end portion is a transport direction end portion of the fourth transport mechanism. The third transport mechanism includes a roller and a chain. The roller is provided at the end of the third transport mechanism. The chain is wound around the roller. The roller is installed so as to be movable with respect to the end portion of the fourth transport mechanism.

  Thereby, it becomes possible to change the shape of the merging portion by moving the roller, and it is possible to pass the cereal without any deviation regardless of the amount of the cereal to join.

  In the above-described combine, it is preferable that the merging portion is deformable between a shape in which the width increases from the upstream side to the downstream side and a shape having a uniform width.

  Thereby, while increasing the quantity of the cutting grain mash which can pass to a junction part, the exit of a junction part does not become narrower than an inlet_port | entrance, and it can prevent that the grain basket which entered the junction part is blocked by an exit.

  The above combine is preferably configured as follows. That is, the third transport mechanism includes an urging member and a movement amount detection unit. The urging member urges the roller in a direction in which the roller comes closer to the fourth conveyance mechanism terminal portion. The movement amount detection unit detects the movement amount of the roller. The urging member includes a first elastic member and a second elastic member. The second elastic member has a larger elastic modulus than the first elastic member. When the distance between the roller and the terminal end of the fourth transport mechanism is smaller than a predetermined distance, an elastic force having a configuration in which the first elastic member and the second elastic member are connected in series acts on the roller. To do. When the distance between the roller and the fourth transport mechanism terminal is greater than a predetermined distance, the elastic force of the second elastic member acts on the roller. Based on the detection result of the movement amount detection unit, the clogging of the merging unit is detected.

  Thereby, when there is little quantity of the harvested cereal rice cake which joins at a junction part, the gap | interval of a junction part can be smoothly extended or shortened according to the quantity of grain kernels. On the other hand, when the movement amount of the roller is approaching the threshold value at which clogging is detected by the movement amount detector, the movement sensitivity of the roller with respect to fine fluctuations in the amount of the harvested cereal is reduced, and erroneous detection of clogging is performed. Can be prevented.

  The above combine is preferably configured as follows. That is, the third transport mechanism includes a second roller. The second roller is provided at the end of the third transport mechanism on the downstream side of the roller in the direction of transporting the cereal. The roller is rotatable about the rotation axis of the second roller.

  Thus, the structure can be simplified by using the shaft center of the second roller as the rotation center of the roller for deforming the joining portion. Further, even if the amount of the harvested cereal rice cake passing through the merge portion increases, the position of the second roller does not change, so that the gap on the outlet side of the merge portion 9 can be prevented from being narrowed.

The right view of the combine which concerns on one Embodiment of this invention. The top view of a combine. Schematic which shows the grain conveying apparatus with which a combine is provided. The expansion perspective view which shows the shape of a confluence | merging part when there are few mowing cereal meals. (A) The perspective view which shows the structure of the track | orbit guide part and adjustment mechanism of a lower left conveyance mechanism. (B) The side view which shows the structure of a track guide part and an adjustment mechanism. The expansion perspective view which shows the structure of an expansion-contraction rod. The expansion perspective view which looked at the track guide part etc. from the bottom side. The expansion perspective view which shows the shape of a confluence | merging part when there are many mowing cereals. The graph which shows the relationship between the moving amount of a roller, and the urging | biasing force by a spring. The expansion perspective view which shows the structure of the lower left conveyance mechanism of 2nd Embodiment. The perspective view which shows the structure of the track | orbit guide part and adjustment mechanism in 2nd Embodiment. The partial perspective view which looked at the lower left conveyance mechanism from the bottom face side. The enlarged perspective view which shows the shape of a confluence | merging part when there are many cutting cereal meals in a lower left conveyance mechanism. The side view which shows the structure of a track guide part and an adjustment mechanism. The fragmentary perspective view explaining operation which cancels | releases the rotation lock of a base arm. The fragmentary perspective view which shows a mode that the base arm was rotated from the state of FIG.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a right side view of a combine 100 according to an embodiment of the present invention. FIG. 2 is a plan view of the combine 100. FIG. 3 is a schematic view showing the cereal carrying device 5 included in the combine 100.

  In the following description, “front” means the direction in which the combine 100 proceeds during cutting, and “rear” means the opposite direction. "Left" and "right" mean left and right as viewed from the operator sitting on 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-desorption type combine. The combine 100 includes a traveling machine body 1 supported by a pair of left and right traveling crawlers 2 and a reaping device (reaping part) 3 disposed at the front of the traveling machine body 1 as main components.

  The reaping device 3 is attached to the front portion of the traveling machine body 1 through the reaping frame 30 so as to be movable up and down. In this embodiment, the reaping device 3 is intended for 6-line cutting and can simultaneously harvest 6 lines of cereal. The reaping device 3 includes a cutting blade device 31, a culm raising device 32, a culm conveying device (conveying device) 5, and a weed body 33.

  The cutting blade device 31 is disposed below the cutting frame 30. The cutting blade device 31 has a cutting blade that reciprocates in order to cut the stock of uncut grain culm in the field.

  The grain raising device 32 is arranged in front of the cutting frame 30 and causes an uncut grain harvesting in the field. The grain raising device 32 includes a raising case 61, a star wheel 62, and a take-up belt 63.

  As shown in FIG. 2, the erecting case 61 includes a plurality of erecting tines for erecting an uncut grain culm that has entered between adjacent herbaceous bodies 33. As shown in FIG. 1, the star wheel 62 and the scraping belt 63 are raised and arranged at the lower rear part of the case 61. The star wheel 62 and the rake belt 63 rake up the stock side of the uncut cereal meal that has been raised and raised by the case 61. Then, the stock side of the uncooked cereal rice cake that has been scraped is cut by the cutting blade device 31 shown in FIG.

  The corn straw transporting device 5 is disposed between the corn straw raising device 32 and a front end portion (feed start end side) of a feed chain 11 described later. The cereal masher 5 conveys the chopped cereal that has been cut by the cutting blade device 31.

  As shown in FIG. 3, the cereal conveying device 5 includes an upstream conveying mechanism (first conveying mechanism) 51 and a vertical conveying mechanism (second conveying mechanism) 52. The upstream conveyance mechanism 51 is located on the upstream side in the conveyance direction of the harvested cereal meal, and the vertical conveyance mechanism 52 is located on the downstream side.

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

  The lower left transport mechanism 7, the central lower transport mechanism 53, and the lower right transport mechanism 8 are all provided with chains 67, 65, and 68 for transporting the harvested cereal. The lower left conveyance mechanism 7 conveys the stock of the harvested cereals for the left two of the six strips harvested by the combine 100 to the right rear side. The center lower conveyance mechanism 53 conveys the stocks of the harvested cereals for the two central strips obliquely rearward to the right so as to merge with the cereals conveyed by the lower right conveyance mechanism 8. The lower right conveyance mechanism 8 conveys the stocks of the harvested cereal grains for the two right stripes to the left diagonally backward.

  On the downstream side, the lower right transport mechanism 8 joins the stocks of the two left and second central chopped cereals with the right two chopped cereals transported by the lower left transport mechanism 7. As shown in FIG.

  In the conveying direction of the harvested cereal meal, the lower left conveying mechanism terminal portion (third conveying mechanism terminal portion) 70 that is the downstream end of the lower left conveying mechanism 7 and the right that is the downstream end of the lower right conveying mechanism 8. The lower conveyance mechanism terminal portion (fourth conveyance mechanism terminal portion) 80 is disposed so as to face each other and face each other. In this portion, a joining portion 9 is formed where four cut corn straws and two chopped potato straws join. The junction 9 is a gap between the chain 67 that travels at the lower left transport mechanism end portion 70 and the chain 68 that travels at the lower right transport mechanism end portion 80.

  The vertical conveyance mechanism 52 includes a chain 69 for conveying the harvested cereal meal. The vertical transport mechanism 52 inherits the stock of the harvested cereal mash that has been transported and joined by the lower left transport mechanism 7 and the lower right transport mechanism 8 from the joint section 9. The vertical conveyance mechanism 52 conveys the inherited harvested cereal grains toward the front end of the feed chain 11 that is obliquely upward at the rear.

  A vertical conveyance guide body 57 as a clamping guide member is provided so as to face the outer peripheral side of the chain of the vertical conveyance mechanism 52. The vertical conveyance guide body 57 can hold the stocks of the harvested cereals for six lines with the vertical conveyance mechanism 52.

  Each of the upper left conveyance mechanism 54, the central upper conveyance mechanism 55, and the upper right conveyance mechanism 56 includes a tine for conveying the harvested cereal meal. The upper left transport mechanism 54, the central upper transport mechanism 55, and the upper right transport mechanism 56 transport the head portions of the six cropped cereal grains to the left diagonally backward.

  The weed body 33 is arranged in a convex shape on the lower front part of the grain raising device 32, and weeds the six chopped grain cocoons in the field one by one.

  With this configuration, the combine 100 can drive the reaping device 3 and continuously cut the uncut cereals in the field while driving the traveling crawler 2 by the engine 50 and moving in the field.

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

  The threshing device 12 includes a handling cylinder 21 for threshing threshing, a swing sorter 22, a red pepper fan 23, a processing cylinder 24, and a dust exhaust fan 25. The rocking sorter 22 is configured as a rocking sorting mechanism that sorts the degranulated material falling below the handling cylinder 21. The Kara fan 23 supplies the sorting wind to the swing sorter 22. The processing cylinder 24 reprocesses the threshing discharge taken from the rear part of the handling cylinder 21. The dust exhaust fan 25 discharges dust at the rear part of the swing sorter 22 out of the machine.

  With the above-described configuration, the stock side of the harvested cereal mash that has been sent from the reaping device 3 by the culm transporting device 5 is inherited by the front end side of the feed chain 11. Then, by feeding the feed chain 11, the tip side of the grain culm is introduced into the threshing device 12 and threshed by the handling cylinder 21.

  A waste chain 26 is disposed on the rear end side (feed end side) of the feed chain 11. The waste inherited from the rear end side of the feed chain 11 to the waste chain 26 is discharged to the rear of the traveling machine body 1 in a long state or by a waste cutter 27 provided on the rear side of the threshing device 12. After being cut to a suitable short length, it is discharged to the rear lower side of the traveling machine body 1. In addition, a slag means the cocoon from which the grain was threshed.

  Below the rocking sorter 22 is a first conveyor 28 for picking up the grain (the first sort) selected by the rocking sorter 22 and a second sorter such as a grain with branches and branches. A number conveyor 29 is provided. In the present embodiment, the traveling body 1 is arranged in the left-right direction on the upper surface side of the traveling body 1 in a side view in order of the first conveyor 28 and the second conveyor 29 from the front side in the traveling direction.

  The swing sorter 22 is configured to swing sort (specific gravity sort) the cereal grains that have fallen below the handling cylinder 21. The grains (first sorted matter) that have fallen from the swing sorter 22 are removed by the sorting wind from the tang fan 23 and fall onto the first conveyor 28. A first cereal cylinder 40 extending in the vertical direction is connected to a terminal portion of the first conveyor 28 that protrudes outward from one side wall (in the embodiment, the right side wall) of the threshing device 12 near the grain tank 13. . The grain taken out from the first conveyor 28 is carried into the Glen tank 13 by the first cereal conveyor (not shown) in the first cereal cylinder 40 and stored.

  The rocking sorter 22 carries out second sorting such as grain with branches and branches (reduction-reprocessed product for resorting in which grain and sawdust are mixed) by rocking sorting (specific gravity sorting). 29 is configured to be dropped. The second sorted product taken out by the second conveyor 29 is returned to the upper surface side of the swing sorting board 22 via the second reduction conveyor 41 and the second processing unit 42 and re-sorted. Further, sawdust, dust and the like in the crushed material from the handling cylinder 21 are discharged toward the farm field from the rear part of the traveling machine body 1 by the sorting wind from the Kara fan 23.

  Subsequently, with reference to FIGS. 3 to 8, the configuration of the above-described merging portion 9 will be described in detail. FIG. 4 is an enlarged perspective view showing the shape of the merging portion 9 when there are few harvested cereals. FIG. 5 is a perspective view and a side view showing the configuration of the trajectory guide portion 72 and the adjustment mechanism 81 of the lower left transport mechanism 7. FIG. 6 is an enlarged perspective view showing the configuration of the telescopic rod 84. FIG. 7 is an enlarged perspective view of the trajectory guide portion 72 and the like viewed from the bottom side. FIG. 6 is a partial perspective view showing the back surface of a merging portion 9. FIG. 8 is an enlarged perspective view showing the shape of the merge portion 9 when there are many harvested cereals.

  Conventionally, as shown in Patent Document 1, the shape of the merging portion of the cereal conveyance device was constant. Therefore, in order to smoothly pass through the merged portion even when there are many harvested cereals, the size of the gap at the merged portion has to be increased assuming that the maximum number of strips is cut.

  On the other hand, the combine may cut the maximum number of strips, or may cut only one of the remaining strips. Further, the amount of cereals to be harvested varies depending on the traveling speed of the traveling machine 1 and the like. When a small amount of the harvested cereal rice cake was conveyed to a large gap in the junction, the posture of the harvested cereal rice cake easily collapsed, causing clogging and the like.

  In this respect, as shown in FIGS. 4 and 8, the joining portion 9 of the combine 100 according to the present embodiment is formed to be deformable in accordance with the amount of the harvested cereal rice cake passing therethrough.

  In the case where there is no or a small amount of harvested cereals conveyed to the merging portion 9, the merging portion 9 has a narrower width on the upstream side (inlet portion P) as shown in FIG. The shape becomes wider. When the inlet portion P of the junction 9 is narrowed to the limit, the width of the inlet portion P is determined to be a width that can be satisfactorily retained even with a small amount of harvested cereal. Therefore, even if a small amount of the harvested cereal rice cake is conveyed to the junction 9, the harvested cereal rice cake is satisfactorily held in the gap between the lower left conveyance mechanism 7 and the lower right conveyance mechanism 8, and the downstream side without misalignment. Can be transported to.

  When the harvested cereal mash that is conveyed to the junction 9 increases, the upstream side (inlet part P) of the merging section 9 is expanded from the state of FIG. In the state in which the amount of the harvested cereal passing is close to the assumed upper limit, as shown in FIG. 8, the size of the width on the upstream side of the junction 9 is almost the same as the width on the downstream side. At this time, the junction 9 has a uniform width.

  The upper limit of the passing amount of the harvested cereals is an amount obtained by adding a certain margin to the 6 items (for example, 7 items of the harvested cereal products for the 7 items), considering that the harvesting device 3 of the present embodiment is 6 items. ). Therefore, even when the maximum number of 6 reapings is performed, the left lower conveyance mechanism termination unit 80 and the right lower conveyance mechanism termination unit 80 are smooth without causing clogging of the harvested cereals at the junction 9. Can be conveyed downstream.

  The joining portion 9 is deformed 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. In addition, the detail of the structure for deform | transforming the junction part 9 in response to the quantity of the harvested grain cocoon is mentioned later.

  In the state where the width of the inlet portion P of the junction 9 is greatly widened, as shown in FIG. 8, the passage of the harvested cereals in the junction 9 has a uniform width. In other words, in the above state, the track of the chain 67 of the lower left transport mechanism end portion 70 and the track of the chain 68 of the lower right transport mechanism end portion 80 are parallel to each other. Thereby, the exit of the joining part 9 does not become narrower than an entrance, and it can prevent that the harvested cereal rice cake which entered the joining part 9 is blocked by the exit side.

  Next, a configuration for deforming the merging portion 9 will be described. In the combine 100 according to the present embodiment, the lower left transport mechanism termination 70 located on one side of the junction 9 rotates in a direction away from the lower right transport mechanism termination 80. As a result, the travel route of the chain 67 is changed, and the junction 9 is deformed.

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

  The chain 67 is configured to be endless and is driven to circulate in the lower left transport mechanism 7. The chain 67 that travels at the lower left transport mechanism end portion 70 is disposed so as to face the chain 68 that travels at the lower right transport mechanism end portion 80 across the junction 9 that is a gap. In the junction 9, the stock side of the harvested cereal rice cake is conveyed with both sides being sandwiched between the chains 67 and 68.

  The trajectory guide 72 guides the trajectory of the chain 67 at the lower left transport mechanism end portion 70 of the lower left transport mechanism 7. The track guide 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. The roller bracket 73 is rotatably supported at a tip end portion of a base arm 83 provided in an adjusting mechanism 81 described later.

  4 and 5A are views of the trajectory guide portion 72 and the like as viewed from above, and FIG. 7 is a view of the trajectory guide portion 72 and the like as viewed from below. As shown in FIG. 7, the base plate 77 is configured as a generally triangular plate member. As shown in FIGS. 5A and 5B, the cover plate 78 is configured as a flat plate member bent into a crank shape. By fixing the cover plate 78 on 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 inner space is open on the side close to the lower right transport mechanism terminal portion 80.

  The two rollers 75 and 76 are respectively disposed in the internal 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. The portion where the chain 67 is stretched between the two rollers 75 and 76 constitutes the lower left conveyance mechanism termination portion 70 that faces the lower right conveyance mechanism termination portion 80.

  In the following description, in order to specify each of the two rollers 75 and 76, a roller located on the upstream side in the conveying direction of the harvested cereal is referred to as an upstream roller 75, and a roller located on the downstream side. May be referred to as a downstream roller (second roller) 76.

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

  The adjustment mechanism 81 is attached to a fixed plate 96 fixed to the frame 95 as shown in FIG. The adjustment mechanism 81 includes a base arm (base member) 83, a support shaft bracket 82, a telescopic 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 rotation pin 86. A support bracket 82 is fixed to the other end of the base arm 83.

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

  The telescopic rod 84 connects the base arm 83 and an appropriate place of the track guide portion 72. One end of the telescopic rod 84 in the longitudinal direction is rotatably connected to a middle portion of the base arm 83, and the other end in the longitudinal direction 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 84 a and a bar member 84 b. Both the cylindrical member 84a and the rod member 84b are formed in an elongated shape in a straight line. A shaft hole is formed in the cylindrical member 84a, and a rod member 84b is inserted into the shaft hole. The rod member 84b is slidable in the longitudinal direction with respect to the cylindrical member 84a, and thereby the length of the telescopic rod 84 can be changed. The limit of the contraction direction of the expansion / contraction stroke of the expansion / contraction 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 configured by a compression coil spring, and the coil portion is disposed outside the telescopic rod 84. The telescopic rod 84 expands and contracts in conjunction with the expansion and contraction of the spring 85. Since the spring 85 (expandable rod 84) is disposed in a state of being contracted in the axial direction, an elastic force in a direction in which the expandable rod 84 is extended acts as a biasing force. This elastic force is transmitted from the telescopic 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. Thereby, in the junction part 9, it can hold | maintain while pinching a harvested grain trough between the lower left conveyance mechanism termination | terminus part 70 and the lower right conveyance mechanism termination | terminus part 80. FIG.

  The spring 85 has a configuration in which two springs having different spring constants are arranged in the axial direction. The first spring 85a (first elastic member) having a relatively small spring constant is disposed on the side close to the track guide portion 72, and the second spring 85b (second elastic member) having a relatively large spring constant is a track. It is arranged on the side far from the guide part 72. However, the first spring 85a and the second spring 85b may be arranged in reverse. The spring constant can be rephrased as an elastic modulus.

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

  The stroke on one side in the rotational direction of the track guide portion 72 (specifically, the side rotated by receiving the biasing force of the spring 85) is attached to the base arm 83 by the regulating member 74 shown in FIG. It is defined by contacting the axial end of the set bolt 87. The state in which the regulating member 74 is in contact with the set bolt 87 corresponds to the shape of the merging portion 9 in FIG. The set bolt 87 is provided so as to be movable with respect to the base arm 83 by rotating. Thereby, the lower limit value of the fluctuation range of the width of the inlet portion P of the merging portion 9 can be adjusted.

  The stroke on the other side in the rotation direction of the track guide portion 72 is defined by the limit of the contraction direction of the expansion / contraction stroke of the expansion / contraction rod 84 described above. However, before the telescopic rod 84 reaches the limit in the shrinking direction, when the trajectory guide portion 72 further rotates from the state of FIG.

  As the track guide unit 72 rotates, the upstream roller 75 can move in a direction away from the lower right transport mechanism terminal unit 80. Due to the movement of the upstream roller 75, the gap of the inlet portion P is widened, and the shape of the merge portion 9 is changed.

  Since the support shaft member 89 is disposed between the rotation centers of the rollers 75 and 76, an arc locus is drawn in a direction in which the upstream roller 75 moves away from the lower right transport mechanism terminal portion 80, as indicated by a thick arrow in FIG. At the same time, the downstream roller 76 moves along an arc locus in a direction approaching the lower right transport mechanism terminal portion 80. However, the support shaft member 89 is disposed at a position closer to the center of the downstream roller 76 than the point at which the rotation centers of the rollers 75 and 76 are equally divided. As a result, when the roller bracket 73 rotates, the upstream roller 75 moves more than the downstream roller 76. Accordingly, with the rotation of the roller bracket 73, the upstream roller 75 can be moved with a good stroke in a direction approaching or moving away from the lower right transport mechanism terminal portion 80.

  The position of the support shaft member 89 that is the rotation center of the roller bracket 73 does not coincide with the rotation center of the upstream roller 75 and the rotation center of the downstream roller 76, and is disposed between the two centers. Accordingly, the moment that acts on the roller bracket 73 so as to separate the upstream roller 75 from the lower right transport mechanism end portion 80 due to the tension of the chain 67 and the downstream roller 76 from the lower right transport mechanism end portion 80 due to the tension of the chain 67. The moments acting on the roller bracket 73 cancel each other out. As a result, the trajectory guide portion 72 is difficult to rotate due to the influence of the tension of the chain 67, and the shape of the merging portion 9 can be stabilized.

  The track guide 72 and the adjustment mechanism 81 are attached to the fixed plate 96 so as to be rotatable about the rotation pin 86. In a normal use state, the base arm 83 or a member fixed to the base arm 83 is fixed to a frame or the like by a fixing bolt (not shown). Therefore, the base arm 83 does not rotate from the position shown in FIG. On the other hand, for example, when severe clogging of the harvested cereals occurs at the junction 9, the fixing bolt is removed, and the base arm 83 is rotated from the position of FIG. By doing so, the adjustment mechanism 81 and the track guide part 72 can be rotated obliquely upward and backward. Thereby, the junction part 9 can be open | released greatly and maintenance, such as the removal of a harvested cereal, can be performed easily.

  Next, the operation of the two springs 85a and 85b constituting the spring 85 will be described.

  In the state of FIG. 4 where the gap at the inlet portion P of the merging 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 combined spring of the first spring 85a and the 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 relating to a series-connected combination spring, and is smaller than the spring constant of the first spring 85a.

  When the gap between the entrance portions P is increased to some extent, the spring wires of the coil portions of the first spring 85a come into contact with each other and cannot be further contracted. In this state, the spring constant of the spring 85 as a whole matches the spring constant of the second spring 85b. Thereafter, 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 of FIG. 8 is obtained.

  In the graph of FIG. 9, the relationship between the amount of movement of the upstream roller 75 from the state of FIG. 4 and the magnitude of the urging force of the spring 85 applied to the upstream roller 75 is indicated by a thick line. This graph also shows the amount of movement M1 at which the first spring 85a reaches the contraction limit. When the movement amount of the upstream roller 75 exceeds the above movement amount M1 and only the second spring 85b enters the expansion / contraction region, the increase rate of the urging force with respect to the increase in the gap of the inlet portion P is the same as that of the first spring 85a. It becomes larger than the area | region where both the 2nd springs 85b expand and contract.

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

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

  The potentiometer 90 is attached to the frame 95 as shown in FIG. The potentiometer 90 includes 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 disposed so as to come into contact with the transmission pin 79 and is urged by a spring (not shown) so as to rotate toward the transmission pin 79. As a result, the detection lever 91 always contacts the transmission pin 79.

  When the amount of the harvested cereal meal passing through the junction 9 increases, the trajectory guide 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 and rotates the detection lever 91. The potentiometer 90 can detect the rotation angle of the trajectory guide portion 72 (that is, the amount of movement of the upstream roller 75) by detecting the angle of the detection lever 91.

  Next, detection of clogging of the merging portion 9 in the combine 100 of the present embodiment will be described with reference to FIG.

  The combine 100 of this embodiment is provided with the control part which consists of computers. This control unit monitors the electrical signal output from 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 the merging unit 9 is clogged and displays it on a display arranged near the driver 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 merging unit 9 is clogged in the control unit. This threshold value corresponds to the shape of the junction 9 in FIG. The amount of movement of the upstream roller 75 corresponding to this threshold value is a region where the first spring 85a reaches the contraction limit and the spring constant of the spring 85 matches the spring constant of the second spring 85b (specifically, 1 spring 85a is included in an area larger than the moving amount M1 of the upstream roller 75 at which the shrinkage limit is reached.

  Consider a case where the amount of harvested cereals passing through the junction 9 per unit time increases from zero with this configuration. The chain 67 is pushed as the passing amount of the harvested cereals increases, and the upstream roller 75 moves from the state of FIG. 4, and the size of the gap at the inlet portion P of the junction 9 increases. In accordance with this, the spring 85 is compressed. At this time, the spring 85 functions as a composite 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 simultaneously elastically deformed with a deformation amount corresponding to each spring constant.

  When the movement amount of the upstream roller 75 reaches a predetermined value, the first spring 85a cannot be further contracted, and only the second spring 85b is contracted. Thereafter, the increase rate of the urging force of the spring 85 increases with an increase in the gap of the inlet portion P.

  The state of FIG. 8 is a state in which the amount of movement of the upstream roller 75 is equal to the threshold value by which the control unit determines that the harvested cereal meal is clogged. When the upstream roller 75 further moves further than this, the control unit determines that clogging has occurred.

  The region where the increase rate of the urging force of the spring 85 is large is determined so as to include the boundary state of FIG. Therefore, even when the passing amount of the harvested cereal per unit time in the junction 9 increases to near the limit causing clogging, the harvested cereal is conveyed while strongly resisting the pressure that the harvested culm tries to widen the gap. can do.

  The measurement of the size of the gap by the potentiometer 90 is used not only to determine clogging but also to inform the operator of the amount of harvested cereal that passes through the junction 9. From the viewpoint of accurately detecting the passage amount of the harvested cereal meal by the potentiometer 90, it is preferable that the upstream roller 75 moves to some extent with respect to increase / decrease in the passage amount of the harvested grain meal.

  Due to the density of grains in the field, the amount of harvested grains that pass through the junction 9 per unit time is not constant, and fine variations occur. In the graph of FIG. 9, as a comparative example, the spring 85 is composed of one spring having a spring constant equal to the first spring 85a and one spring having a spring constant equal to the second spring 85b. Cases are shown.

  When the passing amount of the harvested cereal per unit time increases to near the limit that causes clogging, it is possible to detect the variation in the amount of the harvested cereal with a high sensitivity as in the case of “weak spring only” in FIG. If the upstream roller 75 moves, the control unit determines that the clogging has occurred because the boundary is instantaneously exceeded due to the influence of fine variation, although it should not be determined as clogging. There is a risk that. On the other hand, if the urging force is increased over the entire area as in the case of “strong springs only” in FIG. 9, the force sandwiching the harvested cereals passing through the junction 9 becomes too strong, and the When the passage amount is small, it is difficult to detect the passage amount with high accuracy by the potentiometer 90.

  In this respect, in the present embodiment, in the state where the gap is widened to a state close to the state of FIG. 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 the small variation in the amount of harvested cereals becomes dull, so that erroneous detection of clogging can be prevented.

  As described above, the combine 100 according to the present embodiment includes the reaping device 3, the threshing device 12, and the culm conveying device 5. The reaping device 3 reaps cereals. The threshing device 12 threshs the cereal. The cereal masher 5 conveys cereals harvested by the reaper 3 to the threshing device 12. The cereal conveying device 5 includes a lower left conveying mechanism 7, a lower right conveying mechanism 8 and a central lower conveying mechanism 53, a junction 9, and a vertical conveying mechanism 52. The lower left transport mechanism 7, the lower right transport mechanism 8, and the central lower transport mechanism 53 transport the cereals. In the junction 9, the cereals conveyed by the lower left conveyance mechanism 7, the lower right conveyance mechanism 8, and the central lower conveyance mechanism 53 merge and pass. The center lower conveyance mechanism 53 conveys the cereals that have joined at the junction 9. The junction 9 can be deformed according to the amount of cereals to join.

  Thereby, since the shape of the confluence | merging part 9 can be adjusted according to the quantity of the cereals to merge, in the said merging part 9, the conveyance attitude | position can be maintained suitably irrespective of the quantity of cereals, and clogging of the cereals is carried out. It 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 that convey the cereal. The lower left conveyance mechanism 7 conveys the cereals harvested on the left side in the width direction of the reaping device 3. The lower right transport mechanism 8 transports the cereals harvested on the right side in the width direction of the reaping device 3. The junction 9 is formed between the lower left transport mechanism termination 70 and the lower right transport mechanism termination 80. The lower left transport mechanism end portion 70 is a transport direction end portion of the lower left transport mechanism 7. The lower right transport mechanism end portion 80 is a transport direction end portion of the lower right transport mechanism 8. The lower left transport mechanism 7 includes an upstream roller 75 and a chain 67. The upstream roller 75 is provided at the lower left conveyance mechanism terminal portion 70. The chain 67 is wound around the upstream roller 75. The upstream roller 75 is installed so as to be movable with respect to the lower right transport mechanism terminal portion 80.

  Thereby, the shape of the junction part 9 can be changed by moving the upstream roller 75, and the culm can be passed without deviation regardless of the amount of the culm to be merged.

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

  Thereby, while increasing the quantity of the harvested cereal rice cake which can pass to the junction part 9, the exit of the junction part 9 does not become narrower than an inlet_port | entrance, and it can prevent clogging into the junction part at the outlet.

  Moreover, in the combine 100 of this embodiment, the lower left conveyance mechanism 7 includes a spring 85 and a potentiometer 90. The spring 85 urges the upstream roller 75 in a direction in which the upstream roller 75 approaches the right lower conveyance mechanism terminal portion 80. The 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 larger elastic modulus than the first spring 85a. When the distance between the upstream roller 75 and the lower right transport mechanism end portion 80 is smaller than a predetermined distance (that is, a distance corresponding to the above-described movement amount M1), the upstream roller 75 includes a first spring 85a and a 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 larger than the predetermined distance, the elastic force of the second spring 85 b acts on the upstream roller 75. Based on the detection result of the potentiometer 90, the clogging of the junction 9 is detected.

  Thereby, when there is little quantity of the harvested cereal rice cake which joins in the junction part 9, the gap | interval of the joining part 9 can be smoothly extended or shortened according to the quantity of the harvested grain meal. On the other hand, when the movement amount of the upstream roller 75 is approaching the threshold value at which clogging is detected by the potentiometer 90, the movement sensitivity of the upstream roller 75 with respect to fine fluctuations in the amount of harvested cereal is reduced, and clogging occurs. False 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 trajectory guide portion 72) described in the first embodiment is not limited, and can be changed as appropriate. For example, as in the second embodiment described below, the support shaft member 89 may be arranged so as to coincide with the axis of the downstream roller 76.

  The second embodiment will be described mainly with reference to FIGS. 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 illustrating configurations of the trajectory guide unit 72x and the adjustment mechanism 81 according to the second embodiment. FIG. 12 is a partial perspective view of the lower left transport mechanism 7x according to the second embodiment as viewed from the bottom surface side. FIG. 13 is an enlarged perspective view showing the shape of the merge portion 9 when there are many harvested cereal meals in the lower left transport mechanism 7x of the second embodiment. 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, members that are the same as or similar to those in the above-described embodiment are denoted by the same reference numerals in the drawings, and description thereof may be omitted. Also, in FIGS. 11 and 14, the chain 67 is omitted.

  In the lower left transport mechanism 7x of the present embodiment, the trajectory 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.

  The tension roller 45 is disposed in the inner space of the roller bracket 73 and is 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.

  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 disposed at a position that is a predetermined distance away from the lower left conveyance mechanism terminal portion 70.

  The downstream roller 76 of this embodiment is arrange | positioned in the internal space of the spindle bracket 82, as shown in FIG. 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 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 transport mechanism terminal portion 80.

  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 of the joining portion 9. In this embodiment, compared with the above-described first embodiment, the outlet of the merging portion 9 is not narrowed. Therefore, it is possible to prevent the harvested cereal rice cake that has entered the junction 9 from being clogged at the outlet side.

  In addition, a tension roller 45 is provided in the track guide portion 72x of the present embodiment. Therefore, even when the roller bracket 73 is rotated so that the upstream roller 75 is separated from the lower right transport mechanism 8, the tension roller 45 is rotated so as to project rearward along with this rotation. Can absorb slack.

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

  The sub tension roller 46 is disposed outside the chain 67 as shown in FIG. The chain 67 is wound around the outside of the tension roller 45 and the inside 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 suitably maintained. However, the sub tension roller 46 may be omitted.

  In the present embodiment, the regulating member 74 that defines the rotation 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. In a state where the shape of the merging portion 9 is as shown in FIG. 10, the rotation of the track guide portion 72 x is restricted by the restriction member 74 coming into contact with the set bolt 87 attached to the lower surface of the base arm 83.

  The lower left transport mechanism 7 x of this embodiment includes an auxiliary fixing plate 35. 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 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 above-described 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 by 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 members (for example, the base arm 83 etc.) constituting the adjustment mechanism 81. The base arm 83 of the adjustment mechanism 81 is rotatably supported with respect to the protective cover 38 and the fixed plate 96 via the rotation pin 86.

  A restriction plate 39 is fixed to the protective cover 38. A regulation roller 37 is rotatably supported on the auxiliary fixing plate 35. When the auxiliary fixing plate 35 is at the position indicated by the solid line in FIG. By this regulating action, the rotation of the base arm 83 is regulated.

  In the present embodiment, an operation for largely opening the junction 9 for maintenance will be described with reference to FIGS. 15 and 16. FIG. 15 is a partial perspective view for explaining an operation of releasing the rotation lock of the base arm 83. FIG. 16 is a partial perspective view showing a state in which the base arm 83 is rotated from the state of FIG. 15 and 16, the chain 67 is omitted.

  The position of each component indicated by a solid line in FIG. 15 corresponds to FIG. For example, when a severe clogging of the harvested cereals occurs at the junction 9, the operator removes the lock pin 88, grasps the grip 99, and rotates the auxiliary fixing plate 35 in the direction of the thick arrow in FIG. 15. . Then, since the regulation roller 37 moves in a direction away from the regulation plate 39, the base arm 83 can be rotated around the rotation pin 86.

  Subsequently, the operator rotates the base arm 83 in the direction of the white arrow in FIG. Along with this, the trajectory guide portion 72x and the adjustment mechanism 81 rotate. Thereby, as shown in FIG. 16, the joining part 9 can be opened largely, and the maintenance such as the removal of the harvested cereal can be easily performed.

  After completion of the maintenance work, the operator rotates the base arm 83 to the original position (position shown in FIG. 15). Further, the operator rotates the auxiliary fixing plate 35 from the position of the chain line in FIG. 15 to the position of the solid line and returns it to the original position. As a result, the regulation roller 37 comes into contact with the regulation plate 39, and the rotation of the base arm 83 is regulated. Finally, the operator attaches the lock pin 88 and locks the base arm 83 and the auxiliary fixing plate 35 so as not to rotate. Thereby, it will be in the state which can convey a harvested grain mash again in the junction part 9. FIG.

  As described above, in the combine 100 of the present embodiment, the lower left transport mechanism 7x includes the downstream roller 76. The downstream roller 76 is provided at the lower left conveyance mechanism termination portion 70 on the downstream side of the upstream roller 75 in the direction of conveying the cereal. The upstream roller 75 is installed so as to be rotatable about the rotation axis of the downstream roller 76.

  In this way, the structure can be simplified by using the axis of the downstream roller 76 as the rotation center of the upstream roller 75 for deforming the joining portion 9. Moreover, even if the amount of the harvested cereal rice cake passing through the junction 9 increases, the position of the downstream roller 76 does not change, so that the gap on the outlet side of the junction 9 can be prevented from being narrowed.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  The trajectory guide unit 72 and the adjustment mechanism 81 may be provided at the lower right transport mechanism termination unit 80 or may be provided at the junction between the central lower transport mechanism 53 and the lower right transport mechanism 8.

  The spring 85 may be composed of one spring.

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

  The potentiometer 90 may be attached to the support shaft bracket 82 and the rotation of the roller bracket 73 may be directly detected.

  Instead of the lock pin 88, the base arm 83 may be 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 lock of the base arm 83 is performed only by the lock pin 88.

  The structure of the above-mentioned confluence | merging part 9 can also be applied to the harvesting part below 5 cuttings, or cutting 7 or more cuttings.

3 reaping device (reaping part)
5 Grain transporting device 9 Junction section 7 Lower left transport mechanism (first transport mechanism, third transport mechanism)
8 Lower right transport mechanism (first transport mechanism, fourth transport mechanism)
52 Vertical transport mechanism (second transport mechanism)
53 Lower center transport mechanism (first transport mechanism)
67 Chain 70 Lower left transport mechanism end (third transport mechanism end)
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 end (fourth transport mechanism end)
90 Potentiometer (travel distance detector)
100 combines

Claims (5)

A harvesting section for harvesting cereals;
A threshing device for threshing cereals;
A transport device for transporting the cereals harvested by the mowing unit to the threshing device;
A combine comprising:
The transfer device
A plurality of first transport mechanisms for transporting cereals;
A merging portion through which the cereals conveyed by the plurality of first conveying mechanisms merge and pass;
A second transport mechanism for transporting the cereals that have joined at the merging portion;
With
The combine is characterized in that the merging portion can be deformed according to the amount of cereals to be merged. The combine according to claim 1,
The plurality of first transport mechanisms are
A third transport mechanism for transporting the cereals harvested on one side in the width direction of the mowing unit;
A fourth transport mechanism for transporting the cereal harvested on the other side in the width direction of the mowing unit;
Including
The junction is
A third transport mechanism end portion which is a transport direction end portion of the third transport mechanism;
A fourth transport mechanism end portion which is a transport direction end portion of the fourth transport mechanism;
Formed between
The third transport mechanism is
A roller provided at the end of the third transport mechanism;
A chain wound around the roller;
With
The combine is characterized in that the roller is installed so as to be movable with respect to the end portion of the fourth transport mechanism. The combine according to claim 1 or 2,
The combine part is deformable between a shape whose width increases as it goes from the upstream side to the downstream side, and a shape that has a uniform width. The combine according to claim 2,
The third transport mechanism is
An urging member for urging the roller in a direction approaching the terminal end of the fourth transport mechanism;
A movement amount detection unit for detecting the movement amount of the roller;
With
The biasing member is
A first elastic member;
A second elastic member having a larger elastic modulus than the first elastic member;
With
When the distance between the roller and the terminal end of the fourth transport mechanism is smaller than a predetermined distance, an elastic force having a configuration in which the first elastic member and the second elastic member are connected in series acts on the roller. And
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,
The combine that detects clogging of the merging portion based on a detection result of the movement amount detecting portion. A combine according to any one of claims 2 to 4,
The third transport mechanism includes a second roller provided at the terminal end of the third transport mechanism on the downstream side of the roller in the direction of transporting the wheat straw,
The combiner, wherein the roller is rotatable about the axis of the second roller.

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