JP2011120485A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine which can lift or lower a reaping portion in flexible response to the shape of the land. <P>SOLUTION: A combined harvester as the working machine, includes a reaping portion for reaping grain stalks and a reaping portion-lifting or lowering cylinder for lifting or lowering the reaping portion. The reaping portion includes a grass-dividing plate 80, a rotation shaft-attaching portion 83, a potentiometer 89, and a damper 87. The grass-dividing plate 80 is disposed in front of a machine frame to divide grain stalks. The rotation shaft-attaching portion 83 is disposed at the back side of the grass-dividing plate 80, and a grass-dividing plate-rotating shaft 93 is attached to rotate the grass-dividing plate 80. The potentiometer 89 outputs a signal for controlling the lifting or lowering of a reaping portion-lifting or lowering cylinder. The damper 87 is disposed behind the grass-dividing plate 80, and transmits the rotation to the grass-dividing plate-rotating shaft 93 of the grass-dividing plate 80, to the potentiometer 89. The grass-dividing plate-rotating shaft 93 is placed above a virtual straight line L1 drawn in the horizontal direction to pass through the central part of the grass-dividing plate 80 in a side view. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a working machine capable of moving up and down a cutting part.

  Conventionally, a working machine such as a combine has been provided with a cutting height detection sensor for detecting the height of the cutting portion with respect to the ground by means of ultrasonic waves or the like, and the lifting control is performed so that the cutting portion has a predetermined height with respect to the ground. The structure which performs is known. Further, in addition to the cutting height detection sensor, a weeding board having a function as a grounding type detection sensor (detection piece) for detecting the shape of the field is provided, and the weeding board projects into the convex part of the field A working machine configured to prevent this is also known. Patent Document 1 and Patent Document 2 disclose this type of combine.

  In the combine disclosed in Patent Document 1 and Patent Document 2, the weed board (weeding tool) is configured to be rotatable in the vertical direction. When this weed board comes into contact with the convex part of the field, the weed board rotates upward, and along with this rotation, the sliding rod (detection rod) connected to the rear part of the weed board moves backward. The ground switch (detection switch) is pressed. When the ground switch is pressed, control is performed to raise the mowing unit (the mowing device). In this way, the weeding board detects the convex part of the field and raises the cutting part to avoid the weeding of the weeding board.

JP 2001-269031 A Japanese Patent No. 3718562

  However, even in the configurations of Patent Document 1 and Patent Document 2 described above, depending on the shape of the convex portion of the field, when the weed plate and the convex portion are in contact, the force is not applied well in the direction of rotating the weed plate, In some cases, this weed board pierced into the convex part.

  When the weed board thrusts into the convex part of the field, the soil is picked up and transported to the rear of the machine body, so that the soil bites the cutting blade and damages the blade. Furthermore, since the soil is easily transported together with the cereal straw, the durability of the transport device, the cutter, and the like is reduced.

  This invention is made in view of the above situation, The objective is to provide the working machine which can raise / lower a cutting part corresponding to the shape of the ground flexibly.

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 working machine of the following structures is provided. That is, this working machine includes a cutting unit and a lifting device. The harvesting unit harvests cereal grains. The lifting device lifts and lowers the cutting part. The mowing unit includes a weed body, a rotary shaft attachment unit, a detection unit, and a transmission unit. The weed body is arranged in the front part of the aircraft and separates the cereals. The rotating shaft attaching portion is installed behind the weed body and can attach a weed plate rotation shaft for rotating the weed body in the vertical direction. The detection unit outputs a signal for control to raise and lower the lifting device. The transmission unit is installed behind the weed body and transmits the rotation of the weed body with respect to the weed plate rotation axis to the detection unit. The weed plate rotation axis is located above a virtual straight line drawn in the horizontal direction so as to pass through the central portion of the weed body in a side view.

  Thereby, when there exists a convex part or a recessed part in a farm field, a herbicidal body rotates to an up-down direction by receiving force by contacting this convex part or a recessed part. The rotation direction and the rotation amount of the herbaceous body can be detected by the detection unit via the transmission unit, and the convex portion and the concave portion of the field can be detected from the detected content. Therefore, it becomes possible to raise and lower the cutting part in a flexible manner corresponding to the uneven shape of the field. In particular, since the rotation center of the weed body (the weed body rotation axis) is located above, when the weed body comes into contact with the convex portion, the force in the direction in which the weed body rotates is greater than the force in the direction in which the weed body pierces. It becomes easy to receive power. Therefore, it is possible to accurately detect the convex portion and the concave portion of the field and to prevent the weed body from thrusting into the convex portion.

  The working machine preferably has the following configuration. That is, the detection unit includes a rotation arm and an angle detection unit. The rotating arm is connected to the transmission unit. The angle detection unit can detect an angle of rotation of the rotary arm. And the length of the perpendicular drawn from the rotating shaft of the rotating arm to the central axis of the transmitting portion is shorter than the length of the perpendicular drawn from the weed plate rotating shaft to the central axis of the transmitting portion.

  Accordingly, even when the angle of rotation of the weed body is small, the rotation arm of the detection unit can be greatly rotated, so that the rotation of the weed body can be detected with high sensitivity. Therefore, the cutting part can be lifted and lowered with high accuracy corresponding to the uneven shape of the field.

  In the work machine, it is preferable that the transmission unit is installed to extend rearward and upward in a side view.

  Thereby, since a transmission part has an inclination because a transmission part is attached as mentioned above, dust etc. can be dropped below it, without collecting on a transmission part.

  The working machine preferably has the following configuration. That is, this working machine is provided with a warp-like member installed below the weed body. In a state where the weed body is not rotating, at least a rear end portion of the warp-like member is located below a cutting frame included in the cutting unit.

  Thereby, since it becomes difficult for a wrinkle etc. to enter from between a warp-shaped member and a cutting frame, it can prevent that a wrinkle is caught in a cutting frame etc.

The side view which showed the whole structure of the combine which concerns on one Embodiment of this invention. The top view of a combine. The side view which shows a mode that a weed board rotates. The bottom view which shows the structure of a weed board and a rotation detection mechanism. The side view which shows the positional relationship of a weed board and a rotation detection mechanism. Explanatory drawing which shows the geometric relationship between rotation of a weed board and rotation of a rotation arm. The block diagram explaining the structure which raises / lowers a cutting part.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an overall configuration of a combine 10 according to an embodiment of the present invention. FIG. 2 is a plan view of the combine 10. In the following description, the terms “left side”, “right side”, and the like simply mean the left side and the right side toward the front of the combine.

  As shown in FIG. 1, a combine (work machine) 10 according to the present embodiment includes a cutting unit 12 for cutting stocks such as rice and wheat at the front of the machine, and a crawler unit 11 for running the machine. Is provided at the bottom of the fuselage. As shown in FIG. 2, a threshing machine 14 for threshing the harvested corn straw is provided on the upper left side of the combine 10. Further, a Glen tank 15 is provided on the upper right side of the combine 10 so as to be arranged in parallel with the threshing machine 14.

  A cabin 17 for an operator to board is disposed in front of the Glen tank 15. The cabin 17 is provided with a driving operation tool, a driving seat, and the like, and is configured to perform various operations of the combine 10 such as cutting and traveling by operating the driving operation tool. Below the cabin 17, an unillustrated engine is disposed as a drive source for the combine 10.

  The power of the engine is branched and transmitted from the output shaft of the engine to the mission device that drives the crawler unit 11, each part of the threshing machine 14, the discharge auger 51, the mowing unit 12, and the like.

  The crawler part 11 shown in FIG. 1 is arrange | positioned at the both right and left sides of the combine 10, and it is comprised so that the combine 10 may be driven when this crawler part 11 drives. Then, the traveling direction and speed of the combine 10 can be adjusted by changing the driving direction and speed of the left and right crawler portions 11 by the traveling mission device.

  The cylinder connection frame 65 attached to the rear lower side of the cutting unit 12 is rotatably attached to the cutting unit support shaft 62. The cylinder connecting frame 65 is connected to a cutting unit lifting cylinder (lifting device) 63. As the reaping portion lifting cylinder 63 expands and contracts, the cylinder connection frame 65 rotates about the reaping portion support shaft 62, and the position of the reaping portion 12 is displaced up and down.

  The cutting unit 12 includes a preprocessing unit 25, a cutting blade unit 13, a scraping device 47, and a conveyance unit (not shown).

  The pre-processing unit 25 is disposed in the lower front part of the fuselage 10 body. Further, the pretreatment unit 25 includes a weed board (herb body) 80 and a pulling device 46 as main components. The pulling device 46 has an unillustrated tine, and performs pulling work for picking up a fallen crop or converging the tip to a certain width. The weed board 80 is for defining the width to which the crop is to be harvested by the harvesting unit 12, and when the weed board 80 scoops up the fallen rice and the like, the pulling device 46 causes the above-described raising. Make work easier.

  The weeding board 80 located on the right front side of the machine body is configured to be rotatable in the vertical direction according to the shape of the concave and convex portions of the field. The rotation amount and the rotation direction are detected by a rotation detection mechanism 100 (not shown in FIGS. 1 and 2) disposed on the attachment base of the weed board 80. The details of the configuration in which the weed board 80 and the rotation detection mechanism 100 detect the concave and convex portions of the field will be described later.

  A non-contact type cutting height sensor 69 configured with an ultrasonic sensor or the like is disposed behind the weed board 80. The cutting unit elevating cylinder 63 adjusts the ground height of the cutting unit 12 based on the detection result by the cutting height sensor 69 and the detection result by the weed plate 80 and the rotation detection mechanism 100. .

  The cutting blade part 13 is provided with a cutting blade and a receiving blade, and when both are driven right and left, the stock of a crop is cut off. Further, the scraping device 47 is disposed above the cutting blade portion 13, and the scraping device 47 scrapes the cereals cut by the cutting blade portion 13 and delivers it to a conveying portion (not shown). This conveyance part is provided with the conveyance chain, the vertical conveyance chain, etc., and is comprised so that the stock of a crop may be conveyed to the feed chain 16 of the threshing machine 14. FIG.

  The feed chain 16 is configured to convey and thresh while pinching the cereal. After the threshing of the cereal, the grain is sorted and separated from the swarf by an unillustrated sorting device, and the refined grain is stored in the Glen tank 15 as the first thing. The sawdust is cut into an appropriate length by a waste cutter 48 provided at the rear portion of the combine 10 and discharged outside the machine.

  Next, with reference to FIG.3 and FIG.4, the structure which detects the recessed part and convex part of a field with the weed board 80 and the rotation detection mechanism 100 is demonstrated. FIG. 3 is a side view showing how the weed board 80 rotates. FIG. 4 is a bottom view showing the configuration of the weed board 80 and the rotation detection mechanism 100. FIG. 3 shows the weed board 80 and the rotation detection mechanism 100 viewed from the right side of the combine 10.

  The rotation detection mechanism 100 located behind the weed plate 80 includes a base 81, a first support arm 82, a rotation shaft attachment portion 83, a second support arm 84, an attachment plate 85, and a connecting plate 86. , A damper (transmission portion) 87, a damper support portion 88, and a potentiometer (detection portion) 89.

  A base 81 for attaching the weed board 80 and the rotation detection mechanism 100 is attached to the front side of the cutting frame 66 of the combine 10. A first support arm 82 and a damper support portion 88 are connected to the base 81.

  The first support arm 82 extends while curving forward and upward, and is connected to the rotary shaft attachment portion 83 at the tip thereof. The rotating shaft attachment portion 83 has a weed plate rotating shaft 93 for enabling the weed plate 80 to rotate, and a second support arm 84 is connected to the weed plate rotating shaft 93. . That is, the second support arm 84 is configured to be rotatable with respect to the rotary shaft attachment portion 83. The tip of the second support arm 84 is connected to the side surface of the mounting plate 85.

  The attachment plate 85 is a thin plate-like member, and is connected to the weed plate 80 above the attachment plate 85. In addition to the weed plate 80, a connecting plate 86 and a warped member 71 are connected to the mounting plate 85.

  The connecting plate 86 is located behind the mounting plate 85. A U-shaped member 96 is attached so as to sandwich the connecting plate 86 from behind. The connecting plate 86 and the U-shaped member 96 are formed with mounting holes, and the U-shaped member 96 can be rotated with respect to the connecting plate 86 by using the connecting member in the mounting hole. Has been.

  With this configuration, when the attachment plate 85 rotates together with the weed plate 80, the connecting plate 86 receives the force from the attachment plate 85 and rotates together. The U-shaped member 96 receives a force from the connecting plate 86 and moves forward or backward.

  The rear end of the U-shaped member 96 is connected to the damper 87. The damper 87 is configured to absorb impact using hydraulic pressure, and the weed plate 80 is prevented from rotating by a relatively soft material such as a weed or a lump of straw. Moreover, the damper support part 88 connected to the base 81 supports the damper 87 rotatably. For this reason, the load on the damper 87 is supported and the forward and backward movement of the damper 87 is not hindered. A potentiometer 89 capable of detecting an angle is connected to the rear end of the damper 87.

  The potentiometer 89 includes a rotating arm 99 and an angle detector (not shown). The rotating arm 99 is connected to the rear end of the damper 87, and when the damper 87 moves forward, the rotating arm 99 rotates forward about the rotation axis. The angle detection unit is configured to be able to detect the angle at which the rotary arm 99 is rotated. The potentiometer 89 is configured to transmit a detection signal that is a detected angle to a control unit described later.

  With this configuration, when the weed plate 80 is rotated upward by contacting the convex portion of the field, the attachment plate 85 and the connecting plate 86 are also integrally rotated upward. And since the U-shaped member 96 is pulled ahead by the connection board 86 rotating upwards, the damper 87 moves to the front. Thereby, the rotary arm 99 of the potentiometer 89 rotates counterclockwise in FIG. In FIG. 3, the weed board 80 rotating downward from the normal time is indicated by a solid line, and the weed board rotating upward from the normal time is indicated by a two-dot chain line.

  That is, as the weed board 80 rotates, the rotating arm 99 also rotates in conjunction with it. Here, the correspondence between the rotation angle of the weed board 80 and the rotation angle of the rotary arm 99 is uniquely determined based on the length of each part of the rotation detection mechanism 100 and the like. Therefore, the rotation angle of the weed board 80 can be obtained from the rotation angle detected by the potentiometer 89. In addition, when the weed board 80 rotates downward by contacting the recessed part of a field, each part of the rotation detection mechanism 100 operate | moves in the reverse direction when the weed board 80 contacts the convex part.

  Thereby, the combine 10 of this embodiment can detect the shape of the ground in front of the body.

  The warped member 71 attached below the attachment plate 85 has a front inclined portion 31, a flat portion 32, and a rear inclined portion 33. As shown in FIG. 3, the front inclined portion 31 is configured to extend forward and upward. As shown in FIG. 4, the front inclined portion 31 has a shape in which the tip portion is divided into two portions, and the two tip portions are connected so as to sandwich the attachment plate 85. Further, due to the inclination of the front inclined portion 31, when the weed plate 80 comes into contact with the convex portion of the field, the weed plate 80 is easily rotated upward.

  The flat portion 32 is located on the lower surface of the mounting plate 85, and a rear inclined portion 33 is formed behind the flat portion 32.

  The rear inclined portion 33 is configured to extend rearward and upward, and the rear end portion of the rear inclined portion 33 is located behind the front end portion of the cutting frame 66. Therefore, even when there is a heel or the like on the lower surface of the warp-like member 71, the heel flows toward the rear of the machine body along the rear inclined portion 33, and the heel enters from between the cutting frame 66 and the warp-like member 71. There is nothing. Therefore, it is the structure which can prevent that a hook is caught.

  Next, with reference to FIG.5 and FIG.6, the positional relationship of the weed board 80 and the rotation detection mechanism 100 is demonstrated. FIG. 5 is a side view showing the positional relationship between the weed board 80 and the rotation detection mechanism 100. FIG. 6 is an explanatory diagram showing a geometric relationship between the rotation of the weed board 80 and the rotation of the rotary arm 99. In the following description, a position where the rotation angle of the weed board is 0 ° (a position where the flat portion 32 of the warped member 71 is horizontal) is referred to as a reference position.

  The imaginary straight line L1 shown in FIG. 5 is a straight line drawn horizontally so as to pass through the central portion of the weed plate 80 at the reference position in a side view. The central portion means a height position that bisects the vertical dimension of the weed board 80. As shown in FIG. 5, the weed board rotation shaft 93 of this embodiment is located above the virtual straight line L1.

  Since the rotation center of the weed board 80 (the weed board rotation shaft 93) is located above, even when the weed board 80 contacts the convex portion of the field, In many cases, a force in a direction of rotating the weed board 80 around the rotation center is applied. That is, as the direction of the force that the weed board 80 receives from the ground, the direction in which the weed board 80 is rotated to escape is more dominant than the direction in which the weed board 80 is pushed into the ground. Therefore, the penetration of the weed board 80 into the field can be suppressed, and the weed board 80 picks up and rotates the unevenness of the field with high sensitivity, so that the convex and concave parts of the agricultural field can be detected with high accuracy.

  5 is a vertical line drawn from the weed board rotation shaft 93 to the central axis of the damper 87 when the weed board 80 is at the reference position (position shown in FIG. 5). The virtual straight line L3 is a perpendicular drawn from the rotation axis of the rotary arm 99 to the central axis of the damper 87 when the weed plate 80 is at the reference position.

  As described above, the damper 87 is configured to incline rearward and upward. When the weed plate 80 rotates downward, the damper 87 moves rearward and upward in the axial direction while substantially maintaining the inclination. At this time, as shown in FIG. 6, it is assumed that the point A, which is the intersection of the center axis of the damper 87 and L2, has moved to the point A '. Similarly, it is assumed that the point B that is the intersection of the center axis of the damper 87 and L3 has moved to the point B '. The rotation angle of the weed plate 80 (rotation angle around the weed plate rotation axis 93) is α2, and the rotation angle of the rotary arm 99 on the potentiometer 89 side is α3.

  At this time, the length of the line segment AA ′ and the length of the line segment BB ′ in FIG. 6 is slightly affected by the expansion and contraction of the damper 87 and the change in the inclination angle, but is substantially equal. it can. Therefore, since the relational expression of (the length of the virtual straight line L2) × tan α2 = (the length of the virtual straight line L3) × tan α3 is substantially established from the geometrical relationship, (the length of the virtual straight line L2): (virtual The length of the straight line L3) = tan α3: tan α2. Further, tanα monotonously increases in the range of −90 ° <α <90 °, and α2 and α3 can obviously only take values in this range, so tanα2 and tanα3 increase as α2 and α3 increase. From the above, it can be said that α2 <α3 holds if (length of L2)> (length of L3).

  In this embodiment, the length of the perpendicular line (L2) drawn from the weed plate rotation shaft 93 to the central axis of the damper 87 is equal to the perpendicular line (L3) drawn from the rotation axis of the rotary arm 99 to the central axis of the damper 87. ), The relational expression α2 <α3 is established. Therefore, since the potentiometer 89 can detect the change of the rotation angle of the weed board 80 in a mechanically amplified form, the angle range detectable by the potentiometer 89 can be effectively used to change the uneven shape of the field. It can be detected with high accuracy.

  Next, with reference to FIG. 7, the control for performing the lifting operation will be briefly described. FIG. 7 is a block diagram illustrating a configuration for raising and lowering the cutting unit 12.

  The combine 10 includes a microcomputer-type control unit 110 for controlling each unit, and as shown in FIG. 7, the harvesting unit 12 is moved up and down by the control unit 110.

  A signal indicating the detection contents of the cutting height sensor 69 and the potentiometer 89 is input to the control unit 110. In addition, the control unit 110 sends an appropriate signal to a device (not shown) that adjusts the supply of hydraulic oil, whereby the amount of hydraulic oil supplied to the cutting unit elevating cylinder 63 can be controlled. With this configuration, the height of the cutting unit 12 can be adjusted based on the height detected by the cutting height sensor 69 and the potentiometer 89.

  It is arbitrary how the lifting / lowering amount of the cutting unit 12 is determined based on the cutting height and the rotation amount of the weed plate 80. If the lifting / lowering amount is controlled based only on the cutting height, it can be reliably controlled when the field is flat or gently inclined. However, in an actual field, unevenness is caused by fertilization, spraying of chemicals, grooving work, etc., and since the cutting height sensor 69 is located behind the weed board 80, a control delay occurs. The weeding board 80 may protrude into the convex part. In addition, when the cutting height sensor 69 detects the recess and the cutting unit 12 descends, the weed board 80 may be pressed against the field.

  Therefore, normally, the raising and lowering control of the cutting unit 12 is performed with a specific gravity on the detection signal from the cutting height sensor 69, and the specific gravity is applied to the detection signal from the potentiometer 89 for relatively large inclinations such as unevenness in the field. The above-mentioned problem can be dealt with by performing the lifting control.

  As described above, the combine 10 of the present embodiment includes the cutting unit 12 and the cutting unit lifting cylinder 63. The mowing unit 12 harvests the cereal. The mowing unit lifting cylinder 63 moves the mowing unit 12 up and down. The mowing unit 12 includes a weed plate 80, a rotary shaft attachment unit 83, a potentiometer 89, and a damper 87. The weed board 80 is arranged in the front part of the aircraft and separates the cereals. The rotating shaft attachment portion 83 is installed behind the weed board 80, and can attach a weed board rotating shaft 93 for rotating the weed board 80 in the vertical direction. The potentiometer 89 outputs a signal for controlling the lifting / lowering cylinder 63 to move up and down. The damper 87 is installed behind the weed board 80 and transmits the rotation of the weed board 80 with respect to the weed board rotating shaft 93 to the potentiometer 89. The weed board rotation shaft 93 is located above the virtual straight line L1 drawn in the horizontal direction so as to pass through the central portion of the weed board 80 in a side view.

  Thereby, when there exists a convex part or a recessed part in a farm field, the weed board 80 rotates by receiving force by contacting this convex part or a recessed part. The rotation direction and the rotation amount of the weed board 80 can be detected by a potentiometer 89 through a damper 87, and the convex and concave portions of the field can be detected from the detected contents. Therefore, it becomes possible to raise and lower the cutting unit 12 by supplying hydraulic oil to the cutting unit lifting cylinder 63 in a flexible manner corresponding to the uneven shape of the field. In particular, since the rotation center of the weed board 80 (the weed board rotation shaft 93) is located above, when the weed board 80 comes into contact with the convex portion, the force in the direction in which the weed board 80 pierces is larger than the force. It becomes easy to receive the force in the direction in which the weed board 80 rotates. Therefore, it is possible to accurately detect the convex portion and the concave portion of the field, and to prevent the weed board 80 from being stuck into the convex portion.

  Moreover, in the combine 10 of this embodiment, the potentiometer 89 is provided with the rotation arm 99 and the angle detection part. The rotating arm 99 is connected to the damper 87. The angle detection unit can detect the angle at which the rotary arm 99 is rotated. The length of the imaginary straight line L3 drawn from the rotation axis of the rotary arm 99 to the center axis of the damper 87 is shorter than the length of the imaginary straight line L2 drawn from the weed board rotation axis to the center axis of the damper 87. .

  As a result, even when the angle at which the weed plate 80 is rotated is small, the rotation arm 99 of the potentiometer 89 can be greatly rotated, so that the rotation of the weed plate 80 can be detected with high sensitivity. Therefore, it is possible to raise and lower the cutting unit 12 by supplying hydraulic oil to the cutting unit lifting and lowering cylinder 63 corresponding to the uneven shape of the field with high accuracy.

  Moreover, in the combine 10 of this embodiment, the damper 87 is installed so as to extend rearward and upward in a side view.

  Thereby, since the damper 87 has an inclination by attaching the damper 87 as described above, dust or the like can be dropped below the damper 87 without accumulating on the damper 87.

  Moreover, the combine 10 of this embodiment is provided with the warp-like member 71 installed under the weed board 80. In a state where the weed plate 80 is not rotating, at least the rear inclined portion 33 of the warped member 71 is located below the cutting frame 66 of the cutting unit 12.

  Thereby, since it becomes difficult for a wrinkle etc. to enter from between the warp-like member 71 and the cutting frame 66, it is possible to prevent the wrinkle from being caught by the cutting frame 66 or the like.

  Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

  In the above embodiment, the rotation detection mechanism 100 is provided only behind the right side weed plate 80, but, for example, the rotation detection mechanism 100 may be provided behind the left side weed plate 80.

  In the above embodiment, the damper 87 is used as the transmission unit, but a spring or the like as an elastic member can be used instead. Furthermore, you may use the rod-shaped body which is not an elastic member.

  The potentiometer 89 in the above embodiment is configured to detect an angle, but a detector that detects a position on a straight line can be used instead.

  Moreover, in the said embodiment, although this invention is applied to the combine 10, the working machine which can apply this invention is not limited to the combine 10. FIG. For example, the present invention can be applied to a working machine such as a self-propelled root vegetable harvester that harvests radishes and carrots.

10 Combine (work machine)
12 Cutting part 63 Cutting part lifting cylinder (lifting device)
66 Cutting frame 80 Weeding board (weeding body)
83 Rotating shaft mounting part 87 Damper (Transmission part)
89 Potentiometer (detector)
93 Weeding board rotating shaft 99 Rotating arm

Claims (4)

A harvesting section for harvesting cereals;
A lifting device that lifts and lowers the cutting part;
With
The cutting part is
A herbaceous body placed on the front of the aircraft to separate the cereals,
A rotary shaft mounting portion installed behind the weed body and capable of mounting a weed plate rotation shaft for rotating the weed body in the vertical direction;
A detection unit that outputs a signal for control to raise and lower the lifting device; and
A transmission unit installed behind the weed body, and transmitting the rotation of the weed body with respect to the weed plate rotation axis to the detection unit;
With
The working machine, wherein the weed plate rotation shaft is located above a virtual straight line drawn in a horizontal direction so as to pass through a central portion of the weed body in a side view. The work machine according to claim 1,
The detector is
A rotating arm connected to the transmission unit;
An angle detector capable of detecting an angle of rotation of the rotary arm;
With
The length of the perpendicular drawn from the rotation axis of the rotating arm to the central axis of the transmission unit is shorter than the length of the perpendicular drawn from the weed plate rotation axis to the central axis of the transmission unit Machine. The working machine according to claim 1 or 2,
The working machine, wherein the transmission unit is installed to extend rearward and upward in a side view. The working machine according to any one of claims 1 to 3,
Comprising a sled-like member installed below the weed body,
In a state where the weed body is not rotating, at least a rear end portion of the warp-like member is located below a cutting frame included in the cutting unit.

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