JP2008278802A - Combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combine harvester that simultaneously prevents grain culm clogging and grain culm falling through at the joint part of the plant foot part of the conveyed grain culm of a reaping pretreatment apparatus. <P>SOLUTION: An idler roll 110 that is positioned at the inner peripheral side of the rear end part of a conveying chain 104 with pawls in a left lower conveying mechanism 51 is pivotally supported on the tip of an idler arm 113 rotatable around a spindle 112 projected from a support frame 97. A tension roller 111 is pivotally supported on a shaft 111a at the tip of a tension arm 114 pivotally supported on the drive shaft (pivot) 95b of a drive sprocket 105. While the idler roll 110 is arranged at a side close to a joint part A with a drive sprocket 105 therebetween. The tension roller 111 is in contact with the outer peripheral side of the conveying chain 104 with pawls at a side apart from the joint part A. The idler arm 113 and the tension arm 114 are connected to a tension spring 115 as an urging means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a combine that continuously harvests and threshes planted cereals in a field, and more specifically, a lower transport mechanism (stock transport mechanism) in a pre-cutting processing device that transports the harvested cereals to a threshing unit. It is related with the structure which can prevent clogging of cereals.

  Conventionally, in this type of combine, a cutting pretreatment device is attached to a front portion of a traveling machine body equipped with a threshing device with a feed chain so as to be adjusted up and down by an elevator actuator.

  This pre-cutting processing device is equipped with a weeding device, a grain raising device, a cutting blade device, a scavenging device, an upper transport mechanism, a stock transport mechanism, a vertical transport mechanism, an auxiliary transport mechanism, etc. according to the number of cutting lines Has been. After weeding the planted cereals in the field, we scrape them while raising them with a cedar pulling device, star wheel, and a rake belt which is a belt with protrusions. Disconnect. The harvested cereals are transported while being pinched by the upper transport mechanism and the tip transport tine, while being pinched by the lower transport mechanisms arranged on the left and right of the stock base side for a plurality of strips. In that case, in the rear of the lower body transport mechanism on the left side, for example, on the rear side of the lower transport mechanism on the other side (right side), the stock of the left and right chopped grain cereals is merged and then transported vertically. It is configured to inherit to the mechanism. If a large amount of stock is transported to this junction, there is a risk of clogging between the left and right lower transport mechanisms.

  In order to eliminate this phenomenon, in Patent Document 1, a rotating wheel that winds and supports the rear end of the stock transport chain in either the left or right lower transport mechanism is used as the stock transport chain in the other lower transport mechanism. On the other hand, there is disclosed a configuration in which a rotating wheel is held at a position approaching the other stock transport chain by a cam means that can be displaced in the perspective direction and is rotatable. According to this configuration, the cam means is operated to release the approach position holding of the rotating wheel and to separate it, thereby pulling out the culm clogged at the merging portion and releasing the cereal clogging. .

On the other hand, in Patent Document 2, a rear guide is rotatably arranged around the drive shaft of a drive sprocket that is driven while winding and supporting the rear end portion of the stock transport chain in either the left or right lower transport mechanism, The rear guide is provided adjacent to the rear end of the stock transport chain and is in contact with the inner peripheral surface of the stock transport chain on the merging portion side, and tension is applied to the stock transport chain via the rear guide. A tensioning mechanism is provided.
JP-A-11-127663 JP 2007-29025 A

  However, in both Patent Documents 1 and 2, when clogging occurs in the merging portion, it is a configuration for facilitating the release operation, and a state in which a large amount of culm is conveyed and a small amount It was not possible to automatically adjust the gap of the merging portion in the state where the cereal was conveyed.

  Therefore, the present invention can automatically adjust the gap of the alternating current section according to the change in the amount of the transported culm at the merging part, so that the cereal clogging at the merging part and spilling of the culm It is a technical problem to provide a combine that eliminates both the phenomenon of (dropping off) and realizes smooth grain transport.

  In order to solve this technical problem, the invention of claim 1 includes a traveling machine body on which a threshing device with a feed chain is mounted, and a pre-cutting treatment device attached to the front part of the traveling machine body, The pre-harvest processing device includes a cutting unit, a vertical conveying mechanism that conveys the stock side of the harvested cereal mill toward the feed chain, and a stock source side of the harvested grain from the harvesting unit to the vertical conveying mechanism. A combiner provided with a plurality of left and right lower transport mechanisms for transporting, wherein a joint portion on the stock side by the plurality of lower transport mechanisms is applied to an inner peripheral side of the transport chain in the at least one lower transport mechanism. A contacting idler roller is rotatably provided at one end of a swingable and rotatable idler arm, and biasing means for biasing the idler arm elastically biases the idler roller in a direction approaching the junction. Yo Those provided on.

  According to a second aspect of the present invention, in the combine according to the first aspect, the idler roller is disposed on a side close to the merging portion with a drive sprocket for driving the conveying chain in the lower conveying mechanism interposed therebetween, and the merging A tension roller that abuts the outer peripheral side of the transfer chain is provided on one end of a tension arm that can swing and rotate with respect to the pivot of the drive sprocket. The arm is connected by the biasing means.

  According to a third aspect of the present invention, in the combine according to the first or second aspect, the idler arm extends substantially in parallel with the cereal conveyance direction in which the conveyance chain heads toward the junction.

  According to the first aspect of the present invention, the idler roller in contact with the inner peripheral side of the conveyance chain in the at least one lower conveyance mechanism is oscillated and rotated at the joint portion on the stock side by the plurality of lower conveyance mechanisms. The idler arm is rotatably provided at one end of a possible idler arm, and is provided so as to elastically urge the idler roller in a direction approaching the merging portion by an urging means for urging the idler arm. Therefore, the idler roller automatically moves so as to change the gap at the junction through the elastically biased idler arm in accordance with the change in the amount of the culm passing through the junction. This eliminates both the clogging of cereals and the spilling (dropping out) of the cereals, thereby realizing smooth cereal transportation and improving the workability of the mowing and threshing work.

  According to invention of Claim 2, the said idler roller is arrange | positioned on the side near the said confluence | merging part on both sides of the drive sprocket for driving the conveyance chain in the said lower conveyance mechanism, and the side far from the said confluence | merging part. A tension roller that abuts on the outer peripheral side of the transfer chain is rotatably provided at one end of a tension arm that can swing and rotate with respect to the pivot of the drive sprocket, and the idler arm and the tension arm are attached to the attachment arm. Since it is connected by the biasing means, an appropriate tension can be applied to the transfer chain with the tension arm and tension roller, and the transfer chain becomes excessively loosened or excessively tensioned as the idler roller moves. Can be surely prevented. In addition, since the idler arm and the tension arm are connected by the biasing means, the amount of movement of the tension roller is not constrained with respect to the amount of movement of the idler roller, and appropriate tension is applied. Becomes easy.

  According to the third aspect of the present invention, the idler arm extends substantially parallel to the grain transporting direction in which the transport chain heads toward the merging portion. Therefore, the position and tension of the idler roller with respect to the idler arm. When the ratio with respect to the connection portion of the spring is given, there is an effect that the idler arm can be easily formed long without interfering with other parts.

  DESCRIPTION OF EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings (FIGS. 1 to 8). 1 is a side view of the combine, FIG. 2 is a plan view of the combine, FIG. 3 is a schematic side view of the pre-cutting processing device, FIG. 4 is a schematic plan view of the pre-cutting processing device, and FIG. 5 is a skeleton diagram of the power transmission system. FIG. 6 is a skeleton diagram of a power transmission system in the pre-harvest processing device, FIG. 7 is a plan view of one lower transport mechanism in the junction, and FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG.

(1). First, the schematic structure of the combine will be described with reference to FIGS. 1 and 2.

  The combine for four-row cutting in the embodiment includes a traveling machine body 1 supported by a pair of left and right traveling crawlers 2 and 2. At the front part of the traveling machine body 1, a pre-cutting processing device 3 that takes in planted cereal pods (uncut cereal potatoes) in the field is mounted by a single-acting hydraulic cylinder 4 so as to be adjustable up and down.

  A threshing device 5 with a feed chain 6 and a glen tank 7 for storing grain after threshing are mounted on the traveling machine body 1 side by side. In this case, the threshing device 5 is disposed on the left side in the traveling direction of the traveling machine body 1, and the Glen tank 7 is disposed on the right side in the traveling direction of the traveling machine body 1. A discharge auger 8 is provided at the rear of the traveling machine body 1 so as to be able to turn. The grain in the Glen tank 7 is carried out from the tip throat throw hole of the discharge auger 8 to, for example, a truck bed or a container.

  A control unit 9 is provided between the pre-cutting processing device 3 and the Glen tank 7. A steering handle 10 for changing the traveling (turning) direction and turning speed of the traveling machine body 1, a control seat 11 on which an operator is seated, and the like are disposed in the control unit 9. A side column 12 disposed on one side of the control seat 11 is used for a power transmission operation to the main transmission lever 13 and the sub transmission lever 14 for performing a speed change operation of the traveling machine body 1 and the pre-cutting processing device 3. A mowing clutch lever 15 and a threshing clutch lever 16 for power disconnection operation to the threshing device 5 are provided so as to be able to tilt forward and backward.

  An engine 17 as a power source is disposed below the control unit 9. A transmission case 18 is disposed in front of the engine 17 for appropriately shifting the power from the engine 17 and transmitting it to the left and right traveling crawlers 2. A diesel engine is employed as the engine 17 of the embodiment.

  The pre-harvest processing device 3 includes a clipper-type cutting blade device 19, a culm pulling device 20 for four strips, a culm conveying device 21, and a weed body 22. The cutting blade device 19 is disposed below the cutting frame 45 constituting the framework of the pre-cutting processing device 3. The grain raising apparatus 20 is disposed above the cutting frame 45. The corn straw transporting device 21 is disposed between the corn straw pulling device 20 and the feed start end of the feed chain 6. The weed body 22 is provided in front of the lower part of the grain raising device 20. The traveling machine 1 continuously cuts the uncut grain culm in the field by driving the pre-cutting processing device 3 while driving the left and right traveling crawlers 2 by the engine 17 and moving in the field.

  The threshing device 5 includes a handling cylinder 23 for threshing the harvested cereal, a swing sorting mechanism 24 and a wind sorting mechanism 25 arranged below the handling cylinder 23, and a threshing taken out from the rear part of the handling cylinder 23. And a dust-feed port processing cylinder 26 for reprocessing. The handling cylinder 23 is arranged in the handling chamber of the threshing device 5. The swing sorting mechanism 24 is for swinging and sorting the cereals threshed by the handling cylinder 23, and the wind sorting mechanism 25 is for wind sorting the threshing.

  The stocker side of the harvested cereal meal sent from the pre-harvest processing device 3 is inherited by the feed chain 6. Then, the tip side of the harvested cereal culm is carried into the threshing device 5 and threshed by the handling cylinder 23. In addition, the rotating shaft 74 (refer FIG. 5) of the handling cylinder 23 is extended along the feed direction (the advancing direction of the traveling body 1) of the harvested cereal meal by the feed chain 6.

  In the lower part of the threshing device 5, there are a first receiving bowl 27 where most of the grains selected from the two sorting mechanisms 24, 25 are collected, a grain with a branch stem, a grain of ears, etc. There is provided a second receiving bowl 28 where second things gather. The two receiving rods 27 and 28 of the embodiment are horizontally provided above the rear portion of the traveling crawler 2 in a side view in order of the first receiving rod 27 and the second receiving rod 28 from the front side in the traveling direction of the traveling machine body 1.

  The first thing such as the fine grains collected in the first receiving bowl 27 through the sorting by both sorting mechanisms 24 and 25 is the first conveyor 29 in the first receiving bowl 27 and the cereal in the milling cylinder 31. It is sent to the Glen tank 7 via the conveyor 32 (see FIG. 5).

  The second item such as grain with branch stems is collected in the second receiving rod 28 behind the first receiving rod 27, and from here the second conveyor 30 in the second receiving rod 28 and the reducing conveyor in the reducing cylinder 33. 34 (see FIG. 5) and sent to the second processing cylinder 35. And after the second thing is rethreshed in the second treatment cylinder 35, it is returned to the threshing apparatus 5 and reselected. The sawdust is sucked into the dust exhaust fan 36 and discharged out of the machine from a discharge port (not shown) provided in the rear part of the threshing device 5.

  A waste chain 37 is disposed on the rear side (feed end side) of the feed chain 6. The waste (granulated soot) inherited from the rear end of the feed chain 6 to the waste chain 37 is discharged to the rear of the traveling machine body 1 in a long state, or the waste cutter 38 at the rear of the threshing device 5. After being cut to a short length as appropriate at, it is discharged to the rear of the traveling machine body 1.

(2). Next, the pre-cutting processing apparatus 3 and the surrounding structure will be described with reference to FIGS. 3 and 4.

  The pre-cutting processing device 3 is configured to be vertically rotatable around a horizontally long cutting input pipe 42 that is pivotally supported by a cutting stand 41 in front of the threshing device 5. A longitudinal transmission pipe 43 that extends obliquely downward and forward is attached to the midway portion of the cutting input pipe 42. A midway portion of the longitudinal transmission pipe 43 and the front end portion of the traveling machine body 1 are connected via a single-acting hydraulic cylinder 4.

  A horizontally long horizontal transmission pipe 44 fixed to the lower end portion of the vertical transmission pipe 43 is provided with a plurality of cutting frames 45 that protrude in the forward direction and are arranged at appropriate intervals in the horizontal direction. A clipper-type cutting blade device 19 is provided below the cutting frame 45. And the weeding body 22 is protrudingly provided by the front-end | tip part of each cutting frame 45. As shown in FIG. The horizontal transmission pipe 44 is provided with a plurality of support pipes 46 extending diagonally forward and upward. Each support pipe 46 supports the culm raising device 20 for causing the planted culm in the field.

  As shown in FIG. 3, the grain raising apparatus 20 includes a vertically elongating case 47 having an erecting tine (not shown) for erecting an uncut rice cake taken through the weed body 22, and each of the raising cases 47. A star wheel 48 and a scraping belt 49 are provided at the lower rear part. The star wheel 48 and the scraping belt 49 are for scraping the stock side of the uncut grain raised by the pulling tine of the pulling case 47 corresponding to these sets backward. The stock source side of the uncut grain slag scraped by the star wheel 48 and the scraping belt 49 is cut (cut) by the cutting blade device 19.

  The cereal carrying device 21 disposed between the cereal raising device 20 and the feed start end of the feed chain 6 includes a lower right carrying mechanism 50, a lower left carrying mechanism 51, an upper carrying mechanism 52, a vertical carrying mechanism 53, and a horizontal carrying mechanism. A rotating first relay transport mechanism 54 and a vertical second relay transport mechanism 55 are provided.

  The lower right transport mechanism 50 is of a chain type that transports the right two reaped cereal grains diagonally to the left rear. The lower left transport mechanism 51 is of a chain type that transports the left two reaped cereal grains diagonally to the right and joins the stock side to the vicinity of the feed end portion of the lower right transport mechanism 50. The upper right transport mechanism 52 and the upper left transport mechanism 96 are of a tine system that transports the tips of the harvested cereal grains for four ridges diagonally to the left and back.

  The vertical conveyance mechanism 53 is of a chain type that conveys the stock side of the four reaped cereal grains that merged in the vicinity of the feed end portion of the lower right conveyance mechanism 50 toward the feed chain 6 diagonally upward. . The first relay transport mechanism 54 and the second relay transport mechanism 55 are of a chain system that relays the transport of the harvested cereal culm between the vertical transport mechanism 53 and the feed chain 6.

  The vertical conveying mechanism 53 supports the feed start end side in the longitudinal middle portion of the vertical transmission pipe 43 via the transmission case 58. The vertical transfer mechanism 53 is configured to be rotatable up and down around the transmission case 58 so that the feed end side moves toward and away from the start end side of the feed chain 6 by driving of a vertical transfer actuator (not shown). (See FIG. 4). By such vertical rotation of the vertical transport mechanism 53, the handling depth position of the harvested cereal meal relative to the handling cylinder 23 is adjusted.

  The upper transport mechanism 52, the first relay transport mechanism 54, and the vertical transport mechanism 53 are arranged side by side in this order in a side view. More specifically, the first relay transport mechanism 54 is sandwiched from above and below by the feed end portion of the upper right transport mechanism 52 and the feed end portion of the vertical transport mechanism 53.

  The second relay transport mechanism 55 is located between the first relay transport mechanism 54 and the feed start end portion of the feed chain 6 in the plan view of FIG. 4, and the feed rear side of the feed chain 6 is in the side view of FIG. 3. It overlaps (wraps) the feed start end. The second relay transport mechanism 55 is configured to be capable of changing the posture in the vertical direction with the feeding rear side as a fulcrum by driving of an electric motor (not shown) as an actuator.

  A vertical conveyance guide body 56 as a clamping guide member is disposed at a position facing the feed surface side of the vertical conveyance mechanism 53. The vertical conveyance guide body 56 is for clamping the stock base side of the harvested cereal grains for the four strips together with the vertical conveyance mechanism 53. At the place facing the feed surface side of the first relay transport mechanism 54, the relay that clamps the stock base side (more specifically, the middle part near the stock base) of the harvested cereal grains for the four strips together with the first relay transport mechanism 53 A guide body 57 is disposed (see FIG. 3).

  The stock side of the four sown cereal grains that have been nipped and conveyed by the vertical conveyance mechanism 53 and the vertical conveyance guide body 56 are fed via the first and second relay conveyance mechanisms 54 and 55. It is inherited by the feed start end of the chain 6. And the tip side of these harvested cereals is threshed by the handling drum 23 in the handling chamber of the threshing device 5.

(3). Next, the power transmission system of the combine will be described with reference to FIGS. 5 and 6.

  One of the power from the engine 17 is branched and transmitted in two directions, the pre-cutting processing device 3 and the threshing device 5. Other power from the engine 17 is transmitted to the discharge auger 8. The branching power from the engine 17 to the pre-cutting processing device 3 is once transmitted to the HST input shaft 62 of the hydraulic pump hydraulic motor type (HST type) continuously variable transmission in the mission case 18 via the cutting clutch 61. Shifted. This shift output is transmitted from the cutting PTO shaft 63 projecting from the transmission case 18 to the cutting input shaft 64 in the cutting input pipe 42 via the pulley and the belt transmission system, and from the cutting input shaft 64 to the cutting pre-processing device. Power is transmitted to each of the three devices 19 to 21. Therefore, in this case, the driving speeds of the devices 19 to 21 of the pre-cutting processing device 3 also change in conjunction with the traveling speed of the combine.

  For example, a part of the power transmitted to the cutting input shaft 64 is transmitted to the upper right transport mechanism 52 and the first relay transport mechanism 54 via the upper transmission mechanism 65 connected to the midway part of the cutting input shaft 64. The Further, a part of the power transmitted to the vertical transmission shaft 66 in the vertical transmission pipe 43 is transmitted through the lower transmission mechanism 67 connected to the middle portion of the vertical transmission shaft 66 and the vertical lower conveyance mechanism 53 and the lower right conveyance mechanism 50. Is transmitted to. The vertical conveyance drive shaft 68, which is a constituent element of the lower transmission mechanism 67, protrudes upward from a transmission case 58 attached to the longitudinal middle portion of the vertical transmission pipe 43, and is longitudinally driven by the rotational power of the vertical conveyance drive shaft 68. The transport mechanism 53 is configured to be driven.

  In addition, power is transmitted from the end of the vertical transmission shaft 66 to the cutting blade device 19 through the bevel gear pair in the horizontal transmission pipe 44 and the lower drive shaft 89. Furthermore, power is transmitted from one end of the lower drive shaft 89 to the pulling drive shaft 92 in the upper lateral transmission pipe 91 via the bevel gear pair in one support pipe 46 and the vertical transmission shaft 90, and then further. Power is transmitted to the power transmission section 93 in the four raising cases 47, and each raising tine chain 94 is rotated (see FIG. 6). Power is transmitted to the lower left transport mechanism 51 and the upper left transport mechanism 96 through a transmission mechanism 95 connected to the middle portion of the vertical transmission shaft 90 (see FIG. 6).

  On the other hand, the branching power from the engine 17 toward the threshing device 5 is transmitted to the threshing input shaft 72 via the threshing clutch 71. A part of the power transmitted to the threshing input shaft 72 is transmitted to the rotating shaft 75 of the dust feeding port processing cylinder 26, the rotating shaft 74 of the handling cylinder 23, and the waste chain 37 via the threshing drive mechanism 73. The

  In addition, from the threshing input shaft 72, through the pulley and the belt transmission system, the Kara fan shaft 76 of the wind sorting mechanism 25, the first conveyor 29 and the cereal conveyor 32, the second conveyor 30 and the reduction conveyor 34, and the second processing. It is transmitted to the barrel 35, the swing shaft 77 of the swing sorting mechanism 24, the dust discharge shaft 78 of the dust exhaust fan 36, and the waste cutter 38.

  The branching power passing through the dust removal shaft 78 is transmitted to the rear side of the feed chain 6 through the FC clutch 79 and the feed chain shaft 80, and from the feed chain 6 is a sprocket type power unit arranged on the feed start end side. Power is transmitted to the second relay transport mechanism 55 via the transmission means 81.

  The power from the threshing input shaft 72 can also be transmitted to the cutting input shaft 64 via the pouring clutch 82. That is, by directly transmitting the power from the engine 17 to the pre-cutting processing device 3 without going through the mission case 18, the pre-cutting processing device 3 is forcibly driven at a constant high speed regardless of whether the vehicle speed is fast or slow. The configuration is switchable.

  The power from the engine 17 toward the discharge auger 8 is transmitted through the Glen input gear mechanism 83 and the power interrupting auger clutch 84 to the bottom conveyor 85 in the Glen tank 7 and the vertical conveyor 86 in the vertical auger cylinder in the discharge auger 8. Then, the power is transmitted to the discharge conveyor 88 in the horizontal auger cylinder of the discharge auger 8 via the transfer screw 87.

(4). Detailed structure of the lower transport mechanism Next, referring to FIGS. 4 and 6 to 8, the harvested portion of the harvested cereal is moved by the transport action rear side (merging section) of the left and right lower transport mechanisms 51, 50. A mechanism for preventing clogging of cereals when joining will be described in detail.

  As shown in FIGS. 7 and 8, the case 95a and the support frame 97 of the transmission mechanism 95 of the lower left conveyance mechanism 51, and the support frame 98 for the star wheel 48 and the take-in belt 49 in front thereof are connected to a connecting pipe 99. Further, although not shown, the upper end of the support pipe standing from the cutting frame 45 is connected to the support frame 98 to fix the position and posture. A drive sprocket 105 for driving the endless claw-carrying transfer chain 104 in the lower left transfer mechanism 51 is fixed to the drive shaft (pivot) 95b of the transmission mechanism 95 on the lower surface side of the support frame 97 via a key or the like.

  On the other hand, a non-rotating support shaft 100 is projected downward from the connection pipe 99 and the support frame 98. The cylindrical drum case 103 is rotatably supported (suspended) through an outer case of bearing means 101 provided at the lower end of the non-rotating support shaft 100. On the outer periphery of the cylindrical drum case 103, a driven sprocket 106 for an endless claw transport chain 104 is fixed. Further, a pulley 102 for the scraping belt 49 is detachably attached to the upper end side of the cylindrical drum case 103, and a star wheel 48 is detachably attached to the lower end side.

  The claw-conveying chain 104 is wound around a driving sprocket 105, a driven sprocket 106, and an idler roller 110 described later, and tension is applied by a tension roller 111 described later. Then, the cylindrical drum case 103, the driven sprocket 106, the star wheel 48, and the pulley 102 are integrally rotated in accordance with the rotation of the claw transport chain 104 (see FIGS. 7 and 8). A driven pulley 107 for the take-up belt 49 is rotatably supported on the support frame 98, and the driven side of the take-up belt 49 is wound. On the outer periphery of the rubber scraping belt 49, a protrusion 49a for scratching the stock portion of the cereal is integrally formed.

  The scraping belt 49 and the star wheel 48 in FIG. 7 are arranged on the leftmost side in the aircraft traveling direction in FIG. 4, and this star wheel 48 and the star wheel 48 adjacent to the right side thereof mesh with each other. The right-hand drive belt 49 is also rotationally driven through the concentric shaft and pulley.

  Next, the transporting action rear side of the cereal stock base by the endless claw transport chain of the lower right transport mechanism 50 and the lower left transport mechanism 51 (the confluence portion A shown in FIGS. 4 and 7) A is also a part of the cereal clogging prevention means at the rear of at least one lower transport mechanism (left lower transport mechanism 51 in the embodiment) when joining at the start end of the vertical transport mechanism 53). The configuration will be described.

  The idler roller 110 located on the inner peripheral side of the endless conveyance chain 104 with an endless claw in the lower left conveyance mechanism 51 is rotatable (swinging) around a support shaft 112 protruding downward from the support frame 97. It is pivotally supported by a shaft 110a at the tip of the idler arm 113 that is rotatable. On the other hand, the tension roller 111 is pivotally supported on a shaft 111a at the tip of a tension arm 114 pivotally supported with respect to a drive shaft (pivot axis) 95b of the drive sprocket 105. The idler roller 110 is disposed on the side close to the merging portion A with the drive sprocket 105 interposed therebetween, and the tension roller 111 is in contact with the outer peripheral side of the claw-type conveying chain 104 on the side far from the merging portion A. The idler arm 113 and the tension arm 114 are connected by a tension spring 115 as an example of a biasing means. In that case, one end of the tension spring 115 and the tip of the tension arm 114 are connected by an adjustment bolt 116 whose length is adjustable, so that the spring force of the tension spring 115 can be adjusted.

  With the above configuration, the idler arm 113 is urged to rotate counterclockwise in FIG. 7 by the urging force of the tension spring 115, while the tension arm 114 is urged to rotate clockwise. As a result, the idler roller 110 at the tip of the idler arm 113 is urged at the rear end of the claw conveying chain 104 so that the gap of the joining portion A is small, and the tension roller 111 is tensioned to the conveying chain 104 with claw ( Tension).

  When a large amount of cereals is conveyed to the merging portion A, the gap between the merging portions A (the conveying chain with endless claw in the lower right conveying mechanism 50 and the conveying chain 104 with endless claw in the lower left conveying mechanism 51 face each other. The idler roller 110 moves so as to widen the gap), and the idler arm 113 rotates clockwise in FIG. 7, so that the tension arm 114 also rotates clockwise via the tension spring 115, and the tension roller 111 It is possible to maintain a state in which tension is applied to the outer periphery of the nail transport chain 104. When a small amount of cereal is conveyed to the junction A, the urging force of the tension spring 115 acts and the idler roller 110 moves through the idler arm 113 so that the gap of the junction A becomes small. Thus, the idler roller 110 can automatically move so as to widen or narrow the gap of the merging portion A according to the amount of cereals passing through the merging portion A, and the tension roller 111 does not loosen the conveying chain 104 with a claw. Since the tension is applied to the starter side of the vertical conveying mechanism 53, the effect of smoothing the cereals can be achieved without causing the cereals to fall off (drop off) or clogging the cereals at the junction A. Play.

  The distance (second arm length) from the support shaft 112 to the connection point of the tension spring 115 at the other end of the idler arm 113, rather than the distance (first arm length) from the support shaft 112 to the tip shaft 110a of the idler arm 113. And the second arm length is set larger than that. By setting in this way, the amount of expansion and contraction of the tension spring 115 can be made larger than the distance that the idler roller 110 moves in the direction of adjusting the gap of the merging portion A. The moving urging force (automatic return force) in the direction to reduce the gap can be increased quickly. Therefore, especially when the amount of culm passing through the merging portion A changes from a large state to a small state, it is possible to eliminate omission of the culm at the merging portion A.

  The idler arm 113 extends substantially in parallel to the grain conveying direction of the claw conveying chain 104 toward the junction A, so that the position of the idler roller 110 with respect to the idler arm 113 and the connecting portion of the tension spring 115 are When the above ratio is given, the idler arm 113 can be easily formed long without interfering with other parts. Further, by connecting the idler arm 113 and the tension arm 114 with a tension spring 115 that can be expanded and contracted, the amount of rotation of the tension arm 114 (tension roller 111) is determined by the amount of rotation of the idler arm 113 (movement amount of the idler roller 110). The amount of movement) is not constrained, so that the trouble that the claw-type conveying chain 104 is carelessly loosened or excessively tensioned is also eliminated.

  A proximal end portion of a guide rod 117 formed of a round bar-shaped spring pair is fixed to the support frame 97 at a portion close to the merging portion A on the working surface side (feed surface) of the conveyance chain 104 with pawls. The front end portion of 117 is extended from the merging portion A to the start end side of the vertical transport mechanism 53 so that the cereals can be smoothly inherited.

  As another embodiment, the idler arm 113 and the tension arm 114 may be configured to be elastically biased by separate biasing means (torsion spring) or the like.

  Each structure of above-mentioned embodiment is not limited to the thing of illustration, A various change is possible in the range which does not deviate from the meaning of this invention.

It is a left view of a combine. It is a top view of a combine. It is a schematic side view of a cutting pretreatment apparatus. It is a schematic plan view of a cutting pretreatment apparatus. It is a skeleton figure of a power transmission system. It is a skeleton figure of the power transmission system in a cutting pretreatment device. 4 is an enlarged plan view of a lower left transport mechanism 51. FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 3 Cutting pre-processing apparatus 50 Lower right conveyance mechanism 48 Star wheel 49 Scratching belt 51 Lower left conveyance mechanism 21 Grain conveying apparatus 95b Drive shaft (pivot)
104 Conveyor chain with pawl 105 Drive sprocket 110 Idler roller 111 Tension roller 112 Support shaft 113 Idler arm 114 Tension arm 115 Tension spring 116 as biasing means Adjustment bolt

Claims (3)

A traveling machine body equipped with a threshing device with a feed chain, and a pre-cutting processing device mounted on the front part of the traveling machine body, the pre-cutting processing device includes a cutting unit, and It is a combine provided with a vertical transport mechanism that transports the stock side toward the feed chain, and a plurality of left and right lower transport mechanisms that transport the stock side of the harvested cereal from the harvesting part to the vertical transport mechanism. And
An idler roller that comes into contact with the inner peripheral side of the transfer chain in the at least one lower transfer mechanism is rotatable at one end of an swingable idler arm at the joining portion on the stock side by the plurality of lower transfer mechanisms. The combine is provided so that the idler roller is elastically biased in a direction approaching the merging portion by a biasing means that biases the idler arm. The idler roller is disposed on the side near the merging portion with a drive sprocket for driving the conveying chain in the at least one lower conveying mechanism, and on the outer side of the conveying chain on the side far from the merging portion. A tension roller that abuts is rotatably provided at one end of a tension arm that can swing and rotate with respect to the pivot of the drive sprocket,
The combine according to claim 1, wherein the idler arm and the tension arm are connected by the urging means.   The combiner according to claim 1 or 2, wherein the idler arm extends substantially parallel to a grain transport direction in which the transport chain heads toward the junction.

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