JP2002051604A - Agricultural implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural implement properly adaptable to the state of a field. SOLUTION: The agricultural implement 1 is provided with a tillage rotary working body 16 for tilling the field, and an upper cover 31 for hindering the dispersion of soil is placed above the tillage rotary working body 16. The first land-leveler 38 is placed on the upper cover 31 via an elastic linking body 32. The first land-leveler 38 has the second land-leveler 40 placed via a right and a left rotary arm 60, 60. Each 60 of the rotary arms can be shifted between a locked state in which the rotation around a rotary center shaft Y placed in a lateral horizontal direction on the front end side is inhibited and a free state in which the rotation around the rotary center shaft Y is allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural machine for leveling a field.

[0002]

2. Description of the Related Art Conventionally, this kind of agricultural working machine has been disclosed in, for example, Japanese Utility Model Publication No. 44-22417.
A front arm is rotatably connected via a pin to a support arm suspended and supported by a rear end of the tractor, and includes a pair of left and right rotating arms which are positioned to be spaced apart from each other on the left and right sides. The left and right sides of the front end of the leveling body are rotatably connected to the rear end of the arm body via mounting brackets.

[0003] The agricultural working machine is in a free state in which the rotating arm body is allowed to rotate around a horizontal center axis in the horizontal direction which is coincident with the axis of the pin on the front end side. When the tractor tilts due to the unevenness of the field, the turning arm body turns about its turning center axis, whereby the tilt of the tractor is quickly absorbed, and the leveling body is maintained in a predetermined horizontal state.

[0004]

However, since the conventional agricultural working machine has a structure in which the rotating arm is always in a free state, for example, the leveling body is inadvertently tilted due to the bad influence of the earth mass. However, there is a problem that it is difficult to appropriately cope with the condition of the field, such as inconveniences such as inconvenience.

[0005] The present invention has been made in view of such a point, and an object of the present invention is to provide an agricultural work machine that can appropriately cope with the condition of a field.

[0006]

According to a first aspect of the present invention, there is provided an agricultural working machine, comprising: a pair of rotating arm members which are positioned to be separated from each other on the left and right sides; A turning body that is connected rotatably to level the field, and the turning arm body is in a locked state in which turning about a turning center axis in the left-right horizontal direction at the other end is restricted. And a free state in which rotation about the rotation center axis is permitted.

In this configuration, the rotating arm is
Depending on the condition of the field, the lock state is switched to the locked state in which the rotation about the rotation center axis in the left and right horizontal direction is restricted, or the rotation about the rotation center axis in the left and right horizontal direction is allowed. It may be switched to a free state.

According to a second aspect of the present invention, there is provided the agricultural working machine according to the first aspect, wherein the other side of the rotating arm is engaged with the rotating arm so as to be able to freely engage and disengage with the rotating arm. It is provided with a stopper body for restricting rotation about the central axis.

In this configuration, the stopper body is removably engaged with the rotating arm body to appropriately regulate the rotation of the rotating arm body about the horizontal center axis in the horizontal direction. It is possible.

According to a third aspect of the present invention, in the agricultural working machine according to the second aspect, the stopper body is capable of moving forward and backward with respect to the rotating arm body, and is engaged with the other end of the rotating arm body by advance. It is detachably engaged to restrict the rotation of the other end side of the rotating arm body about the horizontal center axis in the left-right horizontal direction, and is engaged with the other end side of the rotating arm body by retreating. To allow the rotation of the rotation arm body about the rotation center axis.

In this configuration, the switching between the locked state and the free state of the rotating arm can be easily performed by moving the stopper body forward and backward.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the agricultural working machine according to the present invention will be described below with reference to the drawings.

In FIG. 1 to FIG. 3, reference numeral 1 denotes an agricultural working machine such as a scratching device. Is to level the surface of the surface in a horizontal plane.

The agricultural work machine 1 has a machine body 2 detachably mounted on a tractor (not shown). The machine body 2 has an elongated cylindrical main frame 3 having a longitudinal direction in the left-right horizontal direction of the farm work machine 1. are doing.

At the center of the main frame 3 in the longitudinal direction, a transmission 6 having an input shaft 5 is provided, and a three-point connecting portion 7 as a tractor connecting portion is provided. The three-point connecting portion 7 includes a top mast 9 having a top pin 8, a pair of left and right lower arms 11, 11 having a lower pin 10, and the like.

At both ends in the longitudinal direction of the main frame 3, a chain case 14 and a bracket 15 as a pair of left and right side plate frames, which are elongated and substantially rectangular in a side view and have a longitudinal direction in the vertical direction, are spaced apart from each other. Is fixed at the upper end.

The chain case 14 and the bracket
A tilling rotary work body 16 as a tilling body for tilling and crushing a paddy field is rotatably provided between lower end portions of the paddy fields 15. This tillage rotary work body 16 is
And a horizontal rotating shaft 17 suspended between the lower ends of the brackets 15. A plurality of tilling claws 18 are provided on the rotating shaft 17 in parallel with each other in the axial direction at intervals. Is the rotation axis
It protrudes radially from 17.

The chain case 14 and the bracket
A pair of left and right plate-like projecting portions 21 and 21 projecting rearward from the lower rear end of each of the lower and upper portions 15 are provided.
Is located on the side of the tilling rotary work body 16 and prevents the soil discharged from the tilling rotary work body 16 together with the chain case 14 and the bracket 15 from scattering to the side. Further, as shown in FIG. 1, a substantially cylindrical support member 23 having both open ends is attached to the outer side surface of the side cover body 21. The support member 23 has an upper end opening obliquely forward. It has a predetermined inclined state which is opened upward and the lower end opening is opened obliquely rearward and downward. In addition, this support member 23
, A rotation operation setting body 24 as a setting body is rotatably supported. The turning operation setting body 24 is formed by bending an elongated rod-shaped member at three places and forming a substantially isosceles triangle in a side view, and a free end portion (not shown) is inserted into the support member 23 and is equal. Engagement part 25 on the connection part side of two sides
Is formed. Note that the shaft member holding means 26 is constituted by the support member 23 and the rotation operation setting body 24.

On the other hand, between the substantially central portions of the chain case 14 and the bracket 15 in the vertical direction, a slightly curved cover having an elongated rectangular plate shape having a longitudinal direction in the left-right direction and a central portion in the width direction bulging upward. An upper cover body 31 as a body is provided substantially in a horizontal plane. The upper cover body 31 is disposed along the tillage rotary work body 16 at a position above the tillage rotary work body 16 to prevent the soil discharged from the tillage rotary work body 16 from scattering upward.

Also, at the rear end of the upper cover body 31,
A front end portion of an elastic connecting body 32 as an elastically deformable connecting body such as an elongated substantially rectangular plate-like rubber plate having a longitudinal direction in the left-right direction is connected and fixed. As shown in FIG. 1, the elastic connecting body 32 is disposed in an inclined shape that is gradually inclined downward from the front end side to the rear end side.
It is located approximately between 21 and 21.

Further, at the rear end of the elastic connecting body 32,
The front end of a slender, substantially rectangular plate-shaped leveling board 34 having a longitudinal direction in the left-right direction bent at two intermediate points in the width direction is connected and fixed. As shown in FIG.
It is arranged in an inclined shape that is gradually inclined downward from the front end side to the rear end side, and is located behind the pair of left and right side cover bodies 21.

A pair of left and right leveling side plates 35, 35 which are spaced apart from each other and are opposed to each other are fixed to both ends in the longitudinal direction of the leveling board 34, and the front side of the leveling side plate 35 has a side cover body 21 and an elastic connecting body 32. And between them. Further, on the upper outer side surface of the leveling side plate 35, engaging shaft portions 36, 36 such as fixing pins having a circular cross section whose axial directions coincide with the horizontal direction are integrally formed. Leveling side plate 35 of a pair of left and right engaging shafts 36
, Respectively, as shown in FIG.
The dimension of the tip of the engagement shaft portion 36 is set to protrude laterally from the outer surface of the side cover body 21. In addition, the engagement shaft 36
Is disposed at a position slightly closer to the rear end side than the center in the front-rear direction of the elastic connecting plate 32 or at a lateral position at the center in the front-rear direction. Note that a first leveling body 38 such as a leveling plate is configured by the leveling board 34, the leveling side plate 35, the engaging shaft 36, and the like. The first leveling body 38 is located at a position rearward of the plowing rotary work body 16. Position to,
The soil released from the tilling rotary work body 16 is guided downward to level the ground in a substantially horizontal plane.

The engaging shaft portion 36 of the grading side plate 35 of the first grading body 38 is configured to be freely disengageable from the engaging portion 25 of the turning operation setting body 24. The body 24 is urged toward the side cover body 21 by the spring action of the free end side when the body 24 is rotated in one direction about the rotation center axis that coincides with the axial direction of the support member 23 by the operator's hand, for example. And is brought into pressure contact with the side cover body 21, and the engaging portion 25 is
The rotation operation setting body 24 is configured to be capable of engaging and disengaging with the engagement shaft portion 36 of the engagement shaft portion 35 of the first ground adjustment body 38 in the left and right horizontal direction (the rotation axis of the engagement shaft portion 36). Center axis) position change of X,
In other words, a state is set in which the restricting posture restricts the position change of the engaging shaft 36 along the rotation center axis X (FIGS. 1 and 5).

When the turning operation setting body 24 is set in the restricting posture, the engaging shaft 36 engages with the engaging portion 25 of the turning operation setting body 24 in the restricting posture. It is held between the engaging portion 25 and the rear end edge of the side cover body 21 and is in a position change restricted state in which upward or rearward movement is restricted. It is possible.
That is, when the rotation operation setting body 24 is set in the restricting posture, the first ground adjustment body 38 is in a state where it can rotate around the engagement shaft 36 so that the rear end side moves up and down. When the first terrain body 38 rotates, the first terrain body 38
The elastic connector 32 is elastically deformed in such a manner as to be bent along the longitudinal direction in accordance with the rotation of.

The turning operation setting body 24 can be freely moved by, for example, the operator's hand turning the turning member 24 in the other direction opposite to one direction about the turning center axis line coincident with the axial direction of the support member 23. It is urged toward the side cover body 21 by a spring action on the end side and comes into pressure contact with the side cover body 21, and the engagement with the engagement shaft portion 36 of the leveling side plate 35 is released. First
Horizontal axis of rotation of the terrain body 38 (the engaging shaft 36
(The center axis of the center axis X), that is, a state in which the position of the engagement shaft 36 along the rotation center axis X is allowed is set (FIG. 4). Note that, in this state, the first terrain body 38 is in a state of being suspended and held by the elastic connecting body 32.

Further, the front end of a second terrain body 40 as a terrain body such as an elongated rectangular plate-like rake plate having a longitudinal direction in the left-right direction is connected to the rear end of the first terrain body 38. Have been.

As shown in FIG. 6, a stopper support is provided on each of the outer surfaces of the pair of left and right grading side plates 35 of the first grading body 38 located along the left and right direction of the body 2.
41, 41 are fixed by a fixing tool 41a. Each of the pair of left and right stopper supports 41, 41 is a pair of elongated rectangular opposing plates 42, 42, which are opposed to each other substantially in the front-rear direction.
An insertion portion 44 having a substantially U-shaped cross section, which is opened substantially vertically, is formed by a connecting plate 43 integrally connected between one side edge portions along the longitudinal direction of the insertion portions 42, 42. Stopper bodies 55, 55 are slidably inserted into the insertion section 44 along the longitudinal direction of the insertion section 44. The connecting plate 43 has a substantially U-shaped notch 43a formed therein, and an operation plate piece 43b is formed inside the notch 43a in the connecting plate 43. A knob 43c slightly bent outward is formed on one end of the operation plate piece 43b, and a circular protrusion 43d protruding toward the leveling side plate 35 is formed at the center of the operation plate piece 43b. Is formed.

Each of the pair of left and right stopper members 55 has an elongated rectangular substrate portion 56 which can be inserted into the insertion portion 44 of the stopper support member 41. One end of the substrate portion 56 The upper end side is bent at a substantially right angle toward the outside, and a knob 57 is formed at the bent portion. A beak-shaped engaging portion 58 is formed by a substantially triangular notch at the lower end, which is the other end of the substrate portion 56. Further, a free hole portion 56a and a locking hole portion 56b that selectively engage with the protruding portion 43d of the operation plate piece 43b are formed in the base plate portion 56 so as to open in a state of penetrating in the thickness direction. The two free holes 56a and the locking holes 56b are arranged along the longitudinal direction of the substrate 56 with an interval therebetween.

On the other hand, on the lower outer surfaces of the pair of left and right grading side plates 35, 35 of the first grading body 38, support shaft portions 59, 59 whose axial directions coincide with the left and right horizontal directions are directed sideways. The front end sides of the rotating arm bodies 60, 60 are rotatably connected to the respective support shaft portions 59 so as to protrude. Each of the pair of left and right rotating arms 60, 60 positioned opposite to each other on the left and right is formed in a substantially elongated plate shape, and a shaft insertion hole in which a support shaft portion 59 is inserted in a front end side so as not to fall off. A portion 60a is formed, and a tapered engagement receiving portion 60b is formed which engages with the engaging portion 58 of the stopper body 55 in a detachable manner. Further, as shown in FIG. 3, a second grounding body 40 is formed in a shaft insertion hole 60c formed on the rear end side of the rotating arm body 60.
Each of a pair of left and right connecting shaft portions 40b, 40b protruding outward from the front end positions of the left and right side plate portions 40a, 40a is inserted and prevented from coming off.
The left and right sides of the front end portion of the second terrain body 40 are rotatably connected to the rear end side.

The stopper body 55 is configured to be capable of moving forward and backward with respect to the corresponding rotating arm body 60. The stopper body 55 is rotated by a sliding operation in one direction using the knob 57. The stopper body 55 is advanced relative to the arm body 60 and positioned.
When the rotating arm body 60 is engaged with the engagement receiving portion 60b of the
Is the horizontal center axis of rotation in the horizontal direction on the front end side (support shaft 59
(A center axis of the support shaft 59), that is, a locked state in which the rotation about the support shaft 59 along the rotation center axis Y is restricted (the state shown by the two-dot chain line in FIG. 6). ).

In the locked state, the rotating arm body 60 is in a standing posture in which the longitudinal direction coincides with the vertical direction. In this locked state, the stopper support
The projecting portion 43d of the operation plate piece 43b of 41 enters the locking hole 56b of the stopper body 55 and is in a state of being engaged with the locking hole 56b, whereby the stopper body 55 is moved to the stopper support 41. Is securely positioned and fixed.

On the other hand, the engagement between the projection 43d and the locking hole 56b is released by elastically deforming the operation plate 43b outward using the knob 43c of the operation plate 43b. From above, the stopper body 55 is slid in the other direction opposite to the one direction using the knob 57 so that the rotating arm body
When the engaging portion 58 of the stopper body 55 is disengaged from the engagement receiving portion 60b of the rotating arm body 60, the rotating arm body 60 is moved in the left-right horizontal direction on the front end side. The rotation about the rotation center axis (the center axis of the support shaft portion 59) Y, that is, the free state in which the rotation about the support shaft portion 59 along the rotation center axis Y is allowed (see FIG. 4). The state shown by the solid line in FIG. 6). In this free state, the stopper support
The projection 43d of the operation plate piece 43b of 41 enters the free hole 56a of the stopper body 55 and is in a state of being engaged with the locking hole 56a, whereby the stopper body 55 is moved to the stopper support 41. Is securely positioned and fixed.

In the free state, the rotating arm body 60 is moved from the rear end side and the second ground adjustment body 40 around the support shaft 59 in accordance with the earth pressure acting on the second ground adjustment body 40. The second terrain body 40 rotates so as to move up and down, and the first terrain body 38
Is positioned in a predetermined horizontal leveling posture at the rear of the paddy field, and the surface of the paddy field that has been leveled by the first leveling body 38 is leveled flat in a horizontal plane.

The front end portions of a pair of left and right first support arms 46, 46 are rotatably mounted on the left and right arm mounting portions 45 on the upper surface of the upper cover body 31. The upper end of the first suspension rod 47 is rotatably connected to the rear end of the first suspension rod 47, and the lower end of the first suspension rod 47 is rotatably connected to the upper surface of the first grounding body 38. ing. Then, the first support arm 46, the first suspension rod 47, the coil spring
48 and the like, a first terrain body contact pressure adjusting means 49 is configured, and the first terrain body contact pressure adjusting means 49 can adjust the contact pressure of the first terrain body 38 with the field scene. Has become.

The second support arm 51 is attached to the arm mounting portion 50 at the center in the longitudinal direction on the upper surface of the upper cover body 31.
The front end of which is rotatably mounted on the second support arm
The upper end of the second hanging rod 52 is rotatably connected to the rear end of the 51, and the lower end of the second hanging rod 52 is rotatably connected to the upper surface of the second terrain body 40. Have been. The second ground contact pressure adjusting means 54 is composed of the second support arm 51, the second suspension rod 52, a gas spring (not shown), and the like.
The second terrain body 40 is adjusted by the second terrain body ground pressure adjusting means 54.
The contact pressure with the field scene is adjustable. In addition, the second leveling body 40 can be switched between a horizontal leveling attitude for performing leveling work and a substantially vertical soil leveling attitude for performing soil leveling work by operating an operation handle (not shown).

Next, the operation of the embodiment will be described.

A three-point link mechanism (not shown) of the tractor is connected to the three-point link mechanism (hydraulic device for lifting and lowering the work equipment) of the body 2 and the input shaft 5 is connected to the PTO shaft of the tractor (not shown).
Are connected via a power transmission shaft or the like (not shown), and the rotary work body 16 is operated by the driving force from the tractor.

During the roughing work centered on the crushed soil, as shown in FIG. 5, the rotation operation setting body 24 is operated to set the regulating posture, and the engagement shaft portion 36 of the first ground adjustment body 38 is set. The position change of is restricted. As shown by a two-dot chain line in FIG. 6, the operation plate 43b of the stopper body 55 and the stopper support body 41 is operated to move the rotation arm body 60 to the rotation center axis Y.
Into a locked state where it cannot be rotated about.

When the tractor travels to move the whole agricultural work machine 1 forward along the paddy field together with the tractor, the tilling rotary work body 16 performs the tilling and crushing soil work, and the first grading body 38 and the The ground preparation work is performed by the second ground preparation body 40, and the surface of the paddy field is leveled flat in a horizontal plane.

At the time of this rough work, the first leveling body 38
However, if the earth pressure equal to or more than a predetermined magnitude is received based on the impact of the earth mass on the ground adjustment substrate 34, the rear end side of the first earth adjustment body 38 rises around the rotation center axis X in the left-right horizontal direction. The elastic connecting body 32 is rotated in the direction
At a position facing the position 36, for example, at a position near the rear end, the elastic connection body 32 is slightly bent along the longitudinal direction. However, a predetermined portion of the elastic connector 32, that is, a portion located forward of the engagement shaft portion 36 is not deformed, and the space A between the predetermined portion of the elastic connector 32 and the tillable rotary working body 16 does not increase. Therefore, the space A is maintained at a predetermined size. As a result, it is possible to prevent the revolving property of the earth mass of the tilling rotary working body 16 from being deteriorated, and the crushing property is good.

In this rough work, the rotating arm body is used.
Since the lock 60 is in the locked state, the second terrain body 40 is not inadvertently tilted due to the adverse effect of the relatively large and solid soil mass, and the second earth mass is kept in a state where it protrudes from the surface of the field. And can be prevented from escaping to the rear of the ground preparation body 40, and the uniformity is good.

On the other hand, at the time of finishing allowance work centering on leveling, as shown in FIG. 4, the rotation operation setting body 24 is set in an allowable posture, and the position of the engagement shaft portion 36 of the first ground adjustment body 38 is adjusted. Change is allowed. Also, as shown by the solid line in FIG. 6, the operation body 43b of the stopper body 55 and the stopper support body 41 is operated to bring the rotating arm body 60 into a free state in which the rotating arm body 60 can be rotated about the rotation center axis Y.

Then, when the whole agricultural work machine 1 is moved forward along with the tractor along the paddy field by traveling of the tractor, the tilling rotary work body 16 performs the tilling and crushing soil work, and the first grading body 38 and the The ground preparation work is performed by the second ground preparation body 40, and the surface of the paddy field is leveled flat in a horizontal plane.

At the time of this finishing allowance work, the first ground adjustment body 38
Is in a free state in which it is suspended and held by the elastic connecting body 32, and rotates around the horizontal center axis in the horizontal direction so that the rear end moves up and down based on the elastic deformation of the elastic connecting body 32. It moves about a rotation center axis in the front-rear horizontal direction so that the left and right ends move up and down. As a result, the unevenness of the field can be absorbed by the elastic deformation of the elastic linking body 32, and even if the tractor is tilted due to the unevenness of the field, the first leveling body 38 can be absorbed.
The second leveling body 40 can be maintained in a predetermined horizontal state, and the leveling property is good.

Further, at the time of this finishing allowance work, since the rotating arm body 60 is also in the free state, the rotating arm body 60 is rotated about the horizontal center axis Y in the left-right horizontal direction on the front end side. Thus, the inclination of the tractor due to the unevenness of the field can be quickly absorbed, the second terrain body 40 can be constantly maintained in a horizontal state, and the levelness is further improved.

Also, since the restriction on the position change of the engaging shaft 36 has been released, the weight of the first leveling body 38 does not forcibly act on the softened surface of the field, and the second leveling. Body 40
Is in a substantially floating state, so that the weight of the second terrain body 40 does not forcibly act on the softened surface of the field, and a good finished surface can be obtained. Further, in the free state of the engagement shaft portion 36, the horizontal center axis of rotation of the first terrain body 38 in the horizontal direction is located at the upper end, which is the front end of the elastic connector 32. Leveling board 34 and elastic connector
The soil from the tillage rotary work body 16 can be guided flexibly downward at a relatively long distance in the leveling portion having a relatively long distance in the front-rear direction consisting of 32, and the leveling can be improved.

As described above, according to the embodiment,
The turning operation setting body 24 provided on the side cover body 21 on the side of the tilling rotary working body 16 of the machine body 1 is set in the regulating posture by turning in one direction to set the right and left sides of the first terrain body 38. The position change of the horizontal rotation center axis X in the horizontal direction is restricted, or the rotation operation is performed in the other direction to set the posture to the allowable posture and the first position.
The position of the rotation center axis X in the horizontal direction of the left and right horizontal direction of the terrain body 38 can be changed, and the rotation arm body 60 can be in a locked state or a free state. It is possible to appropriately cope with the condition of the field according to the situation and the like, and it is possible to perform an appropriate leveling operation according to the condition of the field.

Further, the setting of the rotation operation setting body 24 and the stopper body 55 can be performed by one-touch operation of the operator, and the operability is good.

In the above-described embodiment, the shaft holding means 26 for releasably holding the engaging shaft 36 of the first ground adjustment body 38 includes the support member 23 and the rotation operation setting body 24. However, for example, the shaft portion holding means 26a shown in FIGS. 7 to 9 may be used.

The shaft holding means 26a has a rotating operation setting body 61 as a rotatable setting body. The rotating operation setting body 61 is formed in a slender, substantially rectangular plate shape and has a longitudinal direction. It is slightly bent near the center, and the inclined portion formed by this bending is the knob 62. A shaft insertion hole 63 is formed at an end of the rotation operation setting body 61 on the base end side opposite to the knob 62, and a side cover body is formed in the shaft insertion hole 63. A support shaft portion 65 protruding laterally from the outer surface of 21 and having an axial direction coinciding with the left-right horizontal direction of the agricultural work machine 1.
Is inserted, and the rotation operation setting body 61 is rotatable around the support shaft 65. A ring-shaped retaining member 66 is fitted to the distal end of the support shaft 65, and a bias is applied between the retaining member 66 and the peripheral portion of the shaft insertion hole 63 of the rotation operation setting body 61. A coil spring 67 as a means is mounted in a compressed state, and the coil spring 67 urges the rotation operation setting body 61 toward the side cover body 21 to rotate the rotation operation setting body 61.
Is in pressure contact with the outer surface of the side cover body 21.

A shaft holding hole 68 is formed at the center of the rotation operation setting body 61 in the longitudinal direction. on the other hand,
On the outer surface of the side cover body 21, there is a shaft portion for setting an allowable posture.
70 is provided so as to protrude toward the side.
Is located above the support shaft 65 and parallel to the support shaft 65.

The turning operation setting body 61 is removably fitted to the engaging shaft portion 36 of the first terrain body 38 by a turning operation in one direction according to the condition of the field according to the work situation and the like. The first alignment body 38 is engaged with the first alignment body 38 in the horizontal direction of the left and right horizontal axis X.
(FIGS. 7 and 9), and the first leveling is performed by releasing the engagement with the engagement shaft portion 36 by a rotation operation in the other direction opposite to the one direction. The posture is set to allow the position change of the rotation center axis X in the left-right horizontal direction of the body 38 (FIG. 8).

That is, when the turning operation setting body 61 is set in the restricting posture, for example, the operator grips the knob 62 of the turning operation setting body 61 in the allowable posture by hand, and the coil spring 67.
Of the rotation operation setting body 61 and the shaft 70 are released from engagement. Thereafter, by rotating in one direction about the support shaft portion 65, the engaging shaft portion 36 of the leveling side plate 35 is inserted into the shaft holding hole 68 of the rotation operation setting body 61, and this rotation is performed. The operation setting body 61 and the engagement shaft 36 are engaged. As a result, the rotation operation setting body 61 changes the position of the rotation center axis X (the center axis of the engagement shaft portion 36) in the horizontal direction of the first terrain body 38, that is, the position of the engagement shaft portion 36. It is in a state where it is set to the restrictive posture for restricting the change.

When the turning operation setting body 61 is set in the restricting posture, the engaging shaft 36 is inserted into the shaft holding hole 68 of the turning operation setting body 61 in the restricting posture. Although it is in a state of being held by the shaft holding hole 68 and is in a position change restricted state in which upward and rearward movements are restricted, rotation at the fixed position is possible. . That is, when the rotation operation setting body 61 is set in the restricted posture,
The first grading body 38 is in a state where it can rotate about the engagement shaft 36 so that the rear end side moves up and down.

When the rotation operation setting body 61 is set in the allowable posture, for example, the operator grips the knob 62 of the rotation operation setting body 61 in the restricted posture by hand, and applies the urging force of the coil spring 67. The engagement between the shaft holding hole 68 of the rotation operation setting body 61 and the engagement shaft 36 is released. Thereafter, by rotating the support shaft 65 in the other direction in the other direction, the shaft 70 of the side cover body 21 is inserted into the shaft holding hole 68 of the rotation operation setting body 61. The setting body 61 and the shaft 70 are engaged. Thus, the rotation operation setting body 61 changes the position of the rotation center axis X (the center axis of the engagement shaft portion 36) in the horizontal direction of the first terrain body 38, that is, the position of the engagement shaft portion 36. The state is set to the allowable posture allowing the change. In this state, the first leveling body 38 is in a state of being suspended and held by the elastic connecting body 32.

In the configuration having the shaft holding means 26a shown in FIGS. 7 to 9, the shaft holding means 26a shown in FIG.
As with the configuration including the above, it is possible to provide the effects such as appropriately responding to the state of the field according to the work situation and the like, and performing appropriate leveling work according to the state of the field.

In each of the above embodiments, the first grounding member 38 has been described as being connected to the rear end of the elastic connecting member 32 such as a rubber plate. For example, as shown in FIG. The support shaft 71 whose axial direction matches the front-rear horizontal direction
A metal connecting body 32 that pivots so that the left and right ends move up and down around the center, and pivots so that the rear end moves up and down around a support shaft 72 whose axial direction coincides with the horizontal direction.
It may be configured to be connected to the rear end of a. Note that the rotation operation setting body 24 shown in FIG. 10 is set in the restricted posture and the rotation center axis X in the horizontal direction of the left and right horizontal direction of the first ground adjustment body 38, that is, of the ground adjustment substrate 34 of the first ground adjustment body 38 The position change of the engagement shaft portions 36, 36 protruding laterally from both left and right ends of the front end portion, which is the upper end portion, is restricted, and the position change of the engagement shaft portions 36, 36 is permitted by being set to the allowable posture.

Further, as shown in FIG. 11, the first terrain body 38 rotates around the support shaft 73 whose axial direction coincides with the horizontal direction in the left-right direction so that the rear end thereof moves up and down and the support shaft is used. The structure may be such that 73 is connected to the rear end of the metal connecting body 32b that moves up and down by being guided by the long hole 74 of the side cover body 21. The rotation operation setting body 24 shown in FIG.
In the same manner as the turning operation setting body 24 shown in FIG. 5, the control posture is set to the regulation posture, and the rotation center axis X in the left-right horizontal direction of the first grading body 38, that is, While restricting the position change of the engaging shafts 36, 36 protruding laterally from both left and right ends of a certain front end, the engaging shafts 3 are set in an allowable posture.
6, 36 position changes are allowed.

In each of the above embodiments, the setting members such as the rotation operation setting members 24 and 61 have been described as being configured to be set in the restricted posture and the allowable posture by the rotation operation. , A configuration that is set by a slide operation, or a configuration that is set by performing an insertion / removal operation of an insertion portion or the like formed in the setting body with respect to the hole of the first leveling body 38.

Further, a driving source (not shown) may be provided to automatically set the posture of the setting body by the driving force from this driving source, or to automatically switch the rotating arm body 60.

Although not shown, the stopper support 4
1, without providing the stopper body 55 etc., the rotating arm body 6
A first pin insertion hole is provided at 0 and a second pin insertion hole, which is inserted into the first pin insertion hole, is provided with the first pin insertion hole.
For example, on the leveling side plate 35 on the side of the leveling body 38,
The switching of the rotary arm body 60 may be performed by inserting and removing a pin from the pin insertion hole and the second pin insertion hole.

[0062]

According to the first aspect of the present invention, the rotating arm is brought into the locked state in which the rotation about the rotation center axis in the horizontal direction is restricted, and the rotation in the horizontal direction is controlled. Since a free state in which rotation about the central axis is allowed can be achieved, it is possible to appropriately cope with a field condition.

According to the second aspect of the present invention, by engaging the stopper body with the rotating arm body in a detachable manner,
The rotation of the rotation arm body about the rotation center axis in the left-right horizontal direction can be appropriately regulated.

According to the third aspect of the present invention, switching between the locked state and the free state of the rotary arm body can be easily performed by moving the stopper body forward and backward.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of an agricultural working machine according to the present invention.

FIG. 2 is a rear view of the agricultural working machine.

FIG. 3 is a partially enlarged rear view of the agricultural working machine.

FIG. 4 is a side view showing a state where the setting body of the agricultural work machine is set in an allowable posture.

FIG. 5 is a side view showing a state where the setting body of the agricultural work machine is set in a restricted posture.

FIG. 6 is a partially enlarged side view of the agricultural working machine.

FIG. 7 is a partially enlarged rear view of another embodiment of the agricultural working machine of the present invention.

FIG. 8 is a side view showing a state where the setting body of the agricultural work machine is set in an allowable posture.

FIG. 9 is a side view showing a state where the setting body of the agricultural work machine is set in a restricted posture.

FIG. 10 is a perspective view of a farm working machine according to still another embodiment of the present invention as viewed from the rear.

FIG. 11 is a perspective view of still another embodiment of the agricultural working machine of the present invention as viewed from the rear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Agricultural work machine 40 Second leveling body as leveling body 55 Stopper body 60 Rotating arm body Y Center axis of rotation

Claims (3)

[Claims] 1. A pair of rotating arm members which are located on the left and right sides of each other so as to be spaced apart from each other, and one of the left and right rotating arm members is rotatably connected to one end of the left and right sides to level the field. A rocking state in which rotation about a rotation center axis in the left-right horizontal direction at the other end is restricted, and rotation about the rotation center axis. The agricultural work machine is configured to be switchable to an allowed free state. 2. A stopper body which is detachably engaged with the rotating arm body and regulates the rotation of the other end side of the rotating arm body about the horizontal center axis in the horizontal direction. The agricultural work machine according to claim 1, wherein: 3. The stopper body is capable of moving forward and backward with respect to the rotating arm body, and is engaged with the other end side of the rotating arm body by advance and releasable engagement with the other end side of the rotating arm body. The rotation about the rotation center axis in the left and right horizontal direction is restricted, and the retraction is released from the engagement with the other end of the rotation arm body, and the rotation center axis of the rotation arm body is 3. The agricultural work machine according to claim 2, wherein rotation around the center is allowed.