Agricultural machinery

Abstract

To provide a farm implement capable of reducing a burden on an operator.SOLUTION: A farm implement 1 includes a tilling body 12 for performing tilling work, a ground levelling body 13 for performing ground levelling work, and a ground contact pressure adjusting part 51 for adjusting ground contact pressure of the ground levelling body 13. The ground contact pressure adjusting part 51 includes driving means 53 and a rotation regulation body 54 that rotates on the basis of the power from the driving means 53. The ground contact pressure adjusting part 51 also includes a rotation body 55 and energizing means 56 for energizing the ground levelling body 13 in a state that the rotation of the rotation body 55 is regulated by the rotation regulation body 54.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an agricultural machine for performing agricultural work. [Background technology]

[0002] BACKGROUND ART Conventionally, an agricultural work machine such as that described in Patent Document 1 below is known.

[0003] This conventional agricultural machine comprises a body that is connected to the rear of a tractor, for example, a running vehicle; a tilling body that is rotatably mounted on the body and performs tilling work while rotating in a predetermined direction; a leveling body that performs ground leveling work behind the tilling body; a torsion spring that biases the leveling body; an operating lever that is integrally mounted contiguous to one end of the torsion spring; and a lever support that supports the operating lever.

[0004] The torsion spring can be selectively switched between a state in which it urges the ground leveling body in a direction that increases the ground pressure of the ground leveling body, a state in which it urges the ground leveling body in a direction that decreases the ground pressure of the ground leveling body, and a state in which it does not urge the ground leveling body, based on manual operation of the operating lever by the worker. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-58304 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the above-mentioned conventional agricultural machine, when adjusting the ground pressure of the ground leveling body, the operator must manually operate the operating lever connected to one end of the torsion spring and position it in the desired hole in the lever support, which can make adjusting the ground pressure of the ground leveling body time-consuming.

[0007] An object of the present invention is to provide an agricultural work machine that can reduce the burden on the worker. [Means for solving the problem]

[0008] The agricultural working machine of the present invention comprises a tilling body that performs tilling work, a leveling body that performs leveling work behind the tilling body, and a ground pressure adjustment unit that adjusts the ground pressure of the leveling body, and the ground pressure adjustment unit has a drive means, a rotation control body that rotates based on power from the drive means, a rotating body whose rotation is controlled by the rotation control body, and a biasing means that biases the leveling body while the rotation of the rotating body is controlled. [Effects of the Invention]

[0009] According to the present invention, the burden on the worker can be reduced. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view of an agricultural machine according to a first embodiment of the present invention. FIG. [Figure 2] FIG. [Figure 3] FIG. 2 is a side view of the ground pressure adjusting section of the agricultural work machine. [Figure 4] FIG. 2 is a plan view of the ground pressure adjusting section of the agricultural work machine. [Figure 5] FIG. 2 is a partially enlarged plan view of a ground pressure adjusting section of the agricultural work machine. [Figure 6] FIG. 4 is a side view of the ground pressure adjusting section of the agricultural work machine in a pressurized state during operation. [Figure 7] FIG. 4 is a side view of the ground pressure adjusting section of the agricultural work machine in a free state during operation. [Figure 8] FIG. 10 is a plan view of a ground pressure adjusting section of an agricultural machine according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] An agricultural machine according to a first embodiment of the present invention will be described with reference to FIGS.

[0012] In the figure, reference numeral 1 denotes an agricultural implement. This agricultural implement 1 is connected to the rear of a tractor (not shown), which is a traveling vehicle, and is a tiller that can perform agricultural work, such as plowing (land leveling), while moving forward (in the direction of travel) through a field such as a rice paddy, as the tractor moves.

[0013] The agricultural work machine 1 is, for example, a folding work machine with a foldable three-part structure, and is equipped with a central work unit 2 that is detachably connected (attached) to a three-point link section at the rear of the tractor, extended work units (side work units) 3 that are provided at both left and right ends of the central work unit 2 and are rotatable up and down around a rotation center axis 5, and an electric hydraulic cylinder (cylinder section) 4 that is a rotation drive means that rotates the extended work unit 3 up and down relative to the central work unit 2.

[0014] Each of the left and right extension working units 3 is deployed by rotating in one direction (approximately 180 degrees in the opening direction) based on the extension and retraction action of the extendable electric hydraulic cylinder 4, and is folded by rotating in the other direction (approximately 180 degrees in the closing direction).

[0015] Therefore, this three-part agricultural work machine 1 can be selectively switched between a state in which work is performed using only the central working unit 2, a state in which work is performed using the central working unit 2 and both the left and right extension working units 3, and a state in which work is performed using the central working unit 2 and only one of the left and right extension working units 3.

[0016] The central working unit 2 comprises a machine body (central machine body) 11 that is detachably connected to the three-point linkage section of the tractor, a tilling body (central tilling body) 12 that is rotatably mounted on the machine body 11 and performs tilling work while rotating in a predetermined direction, and a soil leveling body (central soil leveling body) 13 that is rotatably mounted in the vertical direction at the rear end of the tilling cover section 15 of the machine body 11 and performs soil leveling work behind the tilling body 12.

[0017] The machine body 11 has a three-point linkage 16 that is detachably connected to a three-point linkage of the tractor, and this three-point linkage 16 is made up of a top mast 17 and left and right lower arms 18. The machine body 11 also has a transmission case 19 in the center in the left-right direction, and an input shaft 20 is rotatably provided in this transmission case 19. The input shaft 20 is connected to the PTO shaft of the tractor via a joint.

[0018] Power from the input shaft 20 connected to the PTO shaft is transmitted to the tillage body 12 by a power transmission means (not shown). Frame pipes 14, which are cylindrical frames elongated in the left-right direction, are connected to both the left and right sides of the transmission case 19, and a transmission shaft of the power transmission means is rotatably housed within one of the frame pipes 14.

[0019] The tilling body 12 has a left-right tilling shaft 21 that is driven to rotate in a predetermined direction based on power from the power transmission means, and a plurality of tilling tines 22 that are detachably attached to the tilling shaft 21. The upper part of the tilling body 12 is covered by a tilling cover part 15 of the machine body 11.

[0020] The leveling body (central leveling body) 13 has a first leveling body (central leveling plate) 23, which is an approximately plate-shaped first leveling section attached to the rear end of the tillage cover section 15 of the body 11 so as to be rotatable in the vertical direction around a left-right axis 26, and a second leveling body (central rake) 24, which is an approximately plate-shaped second leveling section attached to the lower end of the first leveling body 23 so as to be rotatable in the vertical direction around a left-right axis 27.

[0021] Each of the left and right extension working units 3 comprises a body (extended body) 31 that can rotate vertically around a rotation center axis (rotation fulcrum) 5 relative to the body 11 of the central working unit 2, a tilling body (extended tilling body) 32 that is rotatably mounted on this body 31 and performs tilling work together with the tilling body 12 of the central working unit 2 when the extension working unit 3 is in the extended state, and a ground leveling body (extended ground leveling body) 33 that is rotatably mounted on the rear end of the tilling cover part 35 of the body 31 and performs ground leveling work together with the ground leveling body 13 of the central working unit 2 when the extension working unit 3 is in the extended state.

[0022] Like the tiller body 12 of the central working unit 2, the tiller body 32 of the extension working unit 3 has a tiller shaft 41 extending in the left-right direction and a plurality of tiller tines 42 detachably attached to the tiller shaft 41. The upper part of the tiller body 32 is covered by the tiller cover part 35 of the machine body 31.

[0023] Similar to the leveling body 13 of the central working unit 2, the leveling body 33 of the extended working unit 3 has a first leveling body (extended leveling plate) 43, which is an approximately plate-shaped first leveling section attached to the rear end of the tillage cover section 35 of the body 31 so as to be rotatable in the vertical direction around a left-right axis, and a second leveling body (extended rake) 44, which is an approximately plate-shaped second leveling section attached to the lower end of the first leveling body 43 so as to be rotatable in the vertical direction around a left-right axis.

[0024] In addition, an auxiliary leveling plate (auxiliary rake) 45 is rotatably provided at the outer end of the second leveling body 44, and this auxiliary leveling plate 45 can be selectively switched between an unfolded state and a folded state by a switching device (side kit) 46 having a driving source such as a motor.

[0025] The agricultural implement 1 also has a ground pressure adjustment unit 51 that adjusts the ground pressure of at least the ground leveling body 13 of the central working unit 2 against the field surface when working in the field (the ground pressure of the ground leveling body 13 and the ground leveling body 33 when working with the central working unit 2 and the extended working unit 3 in the unfolded state).

[0026] That is, for example, at two locations (one location is also possible and the location is optional) on both the left and right sides of the central working section 2, an electric ground pressure adjustment section (ground pressure adjustment device) 51 is provided which can be remotely operated by a worker on a tractor using an operating section such as a remote control (not shown) while working.

[0027] The two ground pressure adjustment units 51 (51a, 51b) in the illustrated left-right pair are different in that they are symmetrical, but have the same basic configuration (see FIG. 2). Note that, for example, the left and right ground pressure adjustment units 51 may not be symmetrical but may have the same configuration, and the ground pressure adjustment unit 51 is not limited to being provided only in the central working unit 2, but may instead be provided only in the extension working unit 3, or may be provided in both the central working unit 2 and the extension working unit 3, for example.

[0028] Here, as shown in Figures 3 to 5, the ground pressure adjustment unit 51 has a drive means 53 which is an actuator capable of outputting power, a rotation restriction body 54 which can rotate to at least a first position (restricted position) and a second position (restriction released position) based on the power from the drive means 53, a rotation restriction body 54 which restricts rotation (at least upward rotation) by the rotation restriction body 54 when the rotation restriction body 54 is located in the first position, but when the rotation restriction body 54 is located in the second position, the restriction is released and the rotation body 55 can rotate in the vertical direction, and a biasing means 56 which biases the ground leveling bodies 13, 33 downward when the rotation of the rotation body 55 is restricted by the rotation restriction body 54, but does not bias the ground leveling bodies 13, 33 when the restriction is released. In addition, the ground pressure adjustment unit 51 is not limited to a configuration in which the rotation restriction body 54 is selectively set (stopped) at the first position and the second position, but may also be configured, for example, in which the rotation restriction body 54 is set at any position, thereby allowing the biasing force to be set at any position.

[0029] The rotation restricting body 54 and the rotating body 55 are provided on the machine body 11 so as to be rotatable about a common central axis 57 in the left-right direction, which is a rotation fulcrum common to both of them, and the common central axis 57 is attached to an attachment portion 58 that protrudes forward from the outer peripheral surface of the frame pipe 14 of the machine body 11. Therefore, the common central axis 57 is located forward of the frame pipe 14. The attachment portion 58 is configured, for example, by a pair of left and right attachment plates 59 that face each other and are spaced apart.

[0030] The biasing means 56 is installed between the rotating body 55 and the ground leveling body 13. In other words, one end of the biasing means 56 is rotatably connected to the rotating body 55, the other end is rotatably connected to the ground leveling body 13, and the middle part is rotatably connected to the machine body 11.

[0031] The driving means 53 rotates the rotation restricting body 54 around a common central axis 57, and is composed of, for example, an electric cylinder 61, which is an extendable electric actuator. The electric cylinder 61 has a cylinder body 62 and a rod 63 that can advance and retreat relative to the cylinder body 62.

[0032] The base end of the cylinder body 62 is rotatably attached via a pin 66 to a cylinder attachment portion 65 that protrudes from the tillage cover portion 15 of the machine body 11. This cylinder attachment portion 65 has a pair of left and right attachment plates 65a, 65b that face each other at a distance, and a pin 66 is installed between the upper ends of these attachment plates 65a, 65b, to which a mounting tube portion 64 at the base end of the cylinder body 62 is rotatably attached. On the other hand, a mounting tube portion 68 at the tip end of the rod 63 is rotatably attached to a round-shaft-shaped rod attachment portion 67 of the rotation restricting body 54. The electric cylinder 61 is located below the upper end 14a of the frame pipe 14 of the machine body 11.

[0033] The rotation restricting body 54 has a pair of left and right opposing plate portions 71 that are rotatable around a common central axis 57. The opposing plate portions 71 are connected to each other by a connecting portion 72 that has a round shaft shape along the left-right direction, and a rod mounting portion 67 that has a round shaft shape and a smaller diameter than the connecting portion 72 is provided integrally with the right end of the connecting portion 72. A mounting tube portion 68 of the rod 63 of the electric cylinder 61 is attached to the rod mounting portion 67, thereby connecting the rotation restricting body 54 and the electric cylinder 61 to each other.

[0034] Further, each of the opposing plate portions 71 is provided with an elongated hole portion 73 that is arc-shaped in side view and has its center (including the approximate center) at the common central axis 57. Note that the elongated hole portion 73 is not limited to the arc-shaped shape shown in the drawing, and may be formed, for example, in a linear shape.

[0035] The rotating body 55 has a rotating plate portion 81 that is rotatable around a common central axis 57 at a position between both opposing plate portions 71 of the rotation restricting body 54, and this rotating plate portion 81 is provided with a first cylindrical portion 82 and a second cylindrical portion 83. The common central axis 57 is inserted into and attached to the first cylindrical portion 82.

[0036] An insertion shaft 85, which is a shaft-shaped insertion portion (shaft portion) in the left-right direction, is inserted and attached to the second cylindrical portion 83. The insertion shaft 85 of the rotating body 55 is inserted into the elongated hole portion 73 of the rotation restrictor 54 so as to be movable (slidable) along the elongated hole portion 73. In other words, the elongated hole portion 73 of the rotation restrictor 54 guides the insertion shaft 85 of the rotating body 55 when the rotating body 55 rotates.

[0037] The biasing means 56 can be selectively switched (changeable) between a pressurized state in which the ground leveling body 13, 33 is biased (pressurized) downward in the direction in which the ground contact pressure of the ground leveling body 13, 33 against the field surface increases, and a free state in which the ground leveling body 13, 33 is not biased, depending on whether or not rotation is restricted by the rotation restricting body 54.

[0038] Specifically, the urging means 56 has an urging member 91 which is a longitudinal first member having a front end attached to the rotating body 55, an arm member 92 which is a longitudinal second member having a lower end attached to the ground leveling body 13, and a rotating member 93 which is a rotatable connecting member that connects the rear end of the urging member 91 with the upper end of the arm member 92. In other words, the urging means 56 is made up of a plurality of members 91, 92, 93 which are rotatably connected to each other.

[0039] The rotating member 93 is rotatably attached to a mounting plate 95, which is a plate-shaped mounting portion protruding from the tillage cover portion 15 of the machine body 11, and to the left mounting plate 65a of the cylinder mounting portion 65 via a pin 96. In other words, the pin 96 is installed between the two mounting plates 65a, 95, which are fixed to the tillage cover portion 15 and face each other at a distance, and the front part of the rotating member 93 is rotatably attached to this pin 96. The rotating member 93 is composed of, for example, a pair of left and right rotating plates 97 that face each other at a distance.

[0040] The upper end of the arm member 92 is rotatably attached to the lower part of the rotating member 93 via a pin 98. The lower end of the arm member 92 is rotatably attached to an attachment part 99 of the first leveling body 23 of the leveling body 13 via a pin 100.

[0041] The biasing member 91 is used to bias (pressurize) the soil leveling bodies 13, 33 in the direction of increasing ground pressure when the rotation of the rotating body 55 is restricted by the rotation restricting body 54 during work in the field, and is composed of, for example, a single elastic body, a gas spring 101. This gas spring for adjusting ground pressure has a cylinder portion 102 filled with nitrogen gas or the like, and a rod portion 103 that can advance and retreat relative to this cylinder portion 102.

[0042] The U-shaped portion 103a at the front end of the rod portion 103 is rotatably attached to the lower part of the rotating plate portion 81 of the rotating body 55 via a pin 106. The U-shaped portion 102a at the rear end of the cylinder portion 102 is rotatably attached to the upper part of the rotating member 93 via a pin 107. The gas spring 101 is located above the tillage cover portion 15 of the machine body 11.

[0043] The common center shaft 57, insertion shaft 85, and various pins in the ground pressure adjusting section 51 are prevented from coming off by a retaining pin (not shown). Also, at the center of the left-right direction of the central working section 2, there is provided a switching section 110 that can selectively switch the ground leveling bodies 13, 33 between a ground leveling work state (a state in which they can move up and down relative to the machine body) and an earthmoving work state (a locked state in which they are fixed to the machine body) (see Figure 2).

[0044] Next, the operation of the agricultural work machine 1 will be described.

[0045] For example, a case will be described in which the left and right extension working units 3 are deployed as shown in FIG. 2, and the central working unit 2 on the center side and the extension working units 3 on both the left and right sides are used to perform plowing work (land leveling work).

[0046] In a farm field (a paddy field filled with water), when the agricultural implement 1 is moved forward (in the direction of travel) in a working posture by driving a tractor, the tilling bodies 12, 32 work together to till the land, and behind them the leveling bodies 13, 33 work together to level the land.

[0047] Here, as shown in FIG. 6, when the rotation restricting body 54 rotates downward and is set to the first position (restricted position) by the contraction of the electric cylinder 61 of the driving means 53 based on the operation of the operating part (for example, pressing the pressure button), the insertion shaft 85 abuts against the end of the long hole portion 73, restricting the upward rotation of the rotating body 55, and the gas spring 101 is in a contracted state (pressurized state of the biasing means 56).

[0048] As a result, the ground leveling bodies 13, 33 are urged (pressurized) downward based on the urging force of the gas spring 101 in its compressed state, and therefore perform ground leveling work with increased ground contact pressure with the field surface.

[0049] In contrast, as shown in Figure 7, when the electric cylinder 61 of the drive means 53 is extended based on the operation of the operating section (for example, pressing the free button), the rotation restriction body 54 rotates upward and is set to the second position (restriction release position), the insertion shaft 85 is located in the middle of the elongated hole portion 73 and can slide along the elongated hole portion 73, i.e., the rotation restriction by the rotation restriction body 54 is released and the rotating body 55 can rotate around the common central axis 57, so that the gas spring 101 is in a fully extended natural length state (free state of the biasing means 56).

[0050] As a result, the ground leveling bodies 13, 33 perform ground leveling work with ground contact pressure based solely on their own weight, without being biased by the gas spring 101.

[0051] For example, if, during this work, the operator wishes to increase the ground pressure of the soil leveling units 13, 33 on the field surface beyond the ground pressure based solely on their own weight, the operator, while still on the tractor, can operate the electric cylinder 61 by remote control to rotate the rotation restricting body 54 to the first position. Also, simply returning the rotation restricting body 54 to the second position releases the restriction imposed by the rotation restricting body 54, allowing the gas spring 101 to return to its natural length.

[0052] When work is performed using only the central working unit 2, only the ground pressure of the leveling body 13 of the central working unit 2 can be adjusted using the ground pressure adjustment unit 51. When work is performed using the central working unit 2 and either the left or right extension working unit 3, the ground pressure of the leveling body 13 of the central working unit 2 and the ground pressure of the leveling body 33 of either the left or right extension working unit 3 can be adjusted simultaneously using the ground pressure adjustment unit 51.

[0053] Furthermore, according to the agricultural work machine 1 described above, the ground pressure adjustment unit 51 has a drive means 53, a rotation restriction body 54 that rotates based on the power from the drive means 53, a rotating body 55 whose rotation is restricted by the rotation restriction body 54, and a ground pressure adjustment biasing means 56 that biases the ground leveling body 13, 33 when the rotation of the rotating body 55 is restricted.Therefore, compared to conventional agricultural work machines, the ground pressure of the ground leveling body 13, 33 against the field surface can be easily adjusted while working in the field, for example, thereby reducing the burden on the worker.

[0054] Furthermore, the rotation restricting body 54 and the rotating body 55 are rotatable around a common central axis 57 relative to the body 11, and the rotation restricting body 54 has an arc-shaped long hole portion 73 centered on the common central axis 57, and the rotating body 55 has an insertion shaft 85 that is movably inserted into the long hole portion 73, so that the configuration of the ground pressure adjusting section 51 can be appropriately simplified and made compact.

[0055] Furthermore, since the electric cylinder (drive source) 61, which is the drive means 53, is located below the upper end 14a of the frame pipe 14 of the machine body 11, the ground pressure adjustment unit 51 can be made even more compact than in a configuration in which, for example, a part of the drive means protrudes significantly upward.

[0056] Furthermore, the gas spring (first member) 101, which is the biasing member 91 of the biasing means 56, is attached to the rotating body 55 and positioned above the tillage cover portion 15 of the machine body 11. Therefore, compared to a configuration in which the biasing member (gas spring) 91 and the arm member 92 are swapped and reversed, for example, muddy water and the like can be prevented from adhering to the gas spring 101 when working in the field, and maintenance is also easier.

[0057] Next, an agricultural work machine according to a second embodiment shown in FIG. 8 will be described.

[0058] 8, the drive means 53 of the ground pressure adjustment unit 51 may be, for example, one that uses an electric motor (not shown) as a drive source. That is, the drive means 53 has a storage case 113 fixed to the tillage cover unit 15 of the machine body 11, and the electric motor, gears, etc. are stored in this storage case 113. In addition, the base end of a connecting rod 116 is rotatably connected to a rotating arm 115 that protrudes from inside the storage case 113 and rotates around a rotation fulcrum 114, and the tip side of this connecting rod 116 is rotatably attached to the rod mounting portion 67 of the rotation restriction body 54.

[0059] Then, the rearward movement of the connecting rod 116 based on the operation of the electric motor causes the rotation restricting body 54 to rotate downward and take up the first position, and as a result, the rotation of the rotating body 55 is restricted by the rotation restricting body 54, and the biasing means 56 biases the leveling bodies 13, 33 downward.

[0060] In addition, the forward movement of the connecting rod 116 based on the operation of the electric motor causes the rotation restriction body 54 to rotate upward and take up the second position, resulting in the rotation restriction of the rotating body 55 by the rotation restriction body 54 being released and the biasing force of the biasing means 56 acting on the leveling bodies 13, 33 no longer acting.

[0061] Therefore, the agricultural work machine 1 according to the second embodiment can also achieve the same effects as the first embodiment described above, such as being able to reduce the burden on the worker.

[0062] In each of the above-described embodiments, a detector such as a potentiometer may detect the operation of the drive means (such as the stroke of the electric cylinder) or the rotational position of the rotation restricting body, and the detection result may be displayed as a pressure force (quantified or visualized as a graph) on a display unit of a terminal or the like via a control unit. Similarly, a detector such as a potentiometer may detect the operation of the drive means (such as the stroke of the electric cylinder) or the rotational position of the rotation restricting body, stop the rotation of the rotation restricting body at an arbitrary position, and store that position in the control unit.

[0063] Furthermore, in any of the embodiments, the configuration is not limited to one in which the drive means operates based on the operation of an operating unit such as a remote control by the operator, but may also be one in which the drive means operates based on the detection results of a detection unit that detects field conditions such as soil quality and the state of finish of the field.

[0064] Furthermore, the agricultural work machine is not limited to a folding work machine and may be, for example, a non-foldable one-piece work machine, and the leveling body is not limited to one having a first and second leveling body and may be, for example, one having only a leveling plate as the first leveling body.Furthermore, it is not limited to a configuration in which the lower end of the arm member is rotatably attached to the first leveling body and may be, for example, a configuration in which the lower end of the arm member is rotatably attached to a second leveling body (rake).

[0065] Furthermore, the configuration is not limited to one in which the biasing means consisting of multiple members connected to each other is installed between the rotating body and the first leveling body, but may also be one in which the biasing means is installed between the rotating body and the second leveling body, for example.

[0066] Furthermore, the number of gas springs (elastic members) constituting the biasing member may be one or more, and is arbitrary, and the orientation of the gas springs is also arbitrary.

[0067] Furthermore, as mentioned above, from the viewpoint of ease of maintenance, etc., it is preferable that the biasing means has a configuration including a biasing member (first member) attached to the rotating body, an arm member (second member) attached to the leveling body, and a connecting member (rotating member) that connects these two members, but it may also be configured in such a way that the biasing member and the arm member are swapped, for example.

[0068] Furthermore, the driving means is not limited to an electric cylinder, but may be, for example, an electric hydraulic cylinder, and the biasing member is not limited to a gas spring, but may be, for example, a configuration having a rod and a coil spring provided on the outer periphery of the rod.

[0069] Although several embodiments and modifications of the present invention have been described, it is also possible to combine the embodiments and modifications as appropriate without departing from the gist of the present invention. [Explanation of symbols]

[0070] 1 Agricultural machinery 12 Cultivating body 13 Land leveling structure 15 Tillage cover 51 Ground pressure adjustment unit 53 Driving means 54 Rotation restrictor 55 Rotating body 56 Actuation means 57 Common central axis as pivot point 73 Long hole part 85 Insertion shaft which is the insertion part 91 First member, biasing member 92 Arm member, which is the second member 93 Rotating member that is a connecting member

Claims

1. A tilling body that does the tilling work, A leveling body that performs leveling work behind the tilling body; A ground pressure adjusting unit is provided to adjust the ground pressure of the ground leveling body, The ground pressure adjusting unit is A driving means; a rotation restricting body that rotates based on power from the driving means; a rotating body whose rotation is restricted by the rotation restricting body; and a biasing means for biasing the ground leveling body in a state where the rotation of the rotating body is restricted, The rotation restricting body and the rotating body are provided so as to be rotatable about a common rotation fulcrum. Agricultural machinery characterized by:

2. The rotation restricting body has an elongated hole portion, The rotating body has an insertion portion that is movably inserted into the long hole portion.

2. The agricultural implement according to claim 1.

3. The biasing means is a first member attached to the rotating body; A second member attached to the ground leveling body; a connecting member that connects the first member and the second member 3. The agricultural machine according to claim 1 or 2.

4. one of the first member and the second member is a biasing member, The other of the first member and the second member is an arm member.

4. The agricultural implement according to claim 3.

5. The connecting member is rotatably provided on a tillage cover portion that covers the tillage body.

4. The agricultural implement according to claim 3.

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