JP4133913B2 - Cultivator - Google Patents

Description

  The present invention relates to a driving force transmission mechanism that transmits a driving force to a tilling claw of a rotary tiller.

Conventionally, as a driving force transmission mechanism that transmits driving force to the tilling claws of a rotary tiller, gears, sprockets, and chains are used, and a forward rotation shaft and a reverse rotation shaft are provided. There is known a field cultivator equipped with a driving force transmission mechanism for the purpose of so-called plowing treatment, so that no plowing is left behind (see, for example, Patent Document 1-2).
JP-A-6-191309 (FIG. 9) JP-A-9-327203 (FIG. 2)

Patent Document 1 will be described with reference to FIG.
FIG. 12 is a schematic view of a conventional tillage claw portion, and a pair of right and left forward tillage shafts 102 and 102 are extended outward from the speed reducer 101, and sleeves 103, 103, which are fixed to each other and welded to the outer peripheries of the respective sleeves 103, 103, ... 105... Are fixed.

  Similarly, a pair of left and right reverse tillage shafts 106, 106 are extended to the outside, and sleeves 107, 107 are fixed to the outer periphery of both ends of the reverse tillage shafts 106, 106 and are welded to the outer periphery of these sleeves 107, 107. The reverse tillage claws 109..., 109.

Patent Document 2 will be described with reference to FIG.
FIG. 13 is a schematic diagram of a conventional tillage claw transmission mechanism, in which a drive chain 111 is wound around three sprockets 112, 113, 114. 112 is a counter sprocket, 113 is a forward sprocket, and 114 is a reverse sprocket. The normal rotation sprocket 113 is engaged with the normal rotation tillage claw shafts 115 and 115, and the normal rotation tillage claw shafts 115 and 115 are attached to the normal rotation tillage claw shafts 115 and 115.

  Next, the reverse sprocket 114 is connected to the reverse tillage claw shafts 117 and 117 via transmission means such as a plurality of gears, and the reverse tillage claw shafts 117 and 117 are connected to the reverse tillage claw shafts 118 and 117. Install.

Transmission of the forward driving force is transmitted from the drive chain 111 → forward sprocket 113 → forward tillage claw shafts 115, 115, and transmission of the reverse driving force is transmitted from the drive chain 111 → reverse sprocket 114 → forward counter shaft. 119 → forward rotation counter gears 121, 121 → reverse rotation tillage gears 122,122 → reverse rotation tillage claw shafts 117,117.
All the prior arts have a mechanism that combines a forward rotation tillage axis and a reverse rotation tillage axis as a countermeasure for the residual tillage treatment.

  However, in Patent Document 1, since the case 101a and the chain case 101b of the speed reducer 101 are arranged at the center in the width direction of the machine body, at least a width T is required between the tilling claws 105 and 105 in the center. As a result, cross-cut placement in which the tilling claws are arranged so that the tilling claws are overlapped with each other in the width direction of the machine body becomes difficult, and a problem remains in the remaining tillage processing of the farm field corresponding to the center portion in the width direction.

On the other hand, in Patent Document 2, measures such as inclining the direction of the tilling claws 118... And devising the shape of the tilling claws 118. However, in order to incline the direction of the tilling claws 118..., It is necessary to add a new transmission mechanism in addition to the reverse tillage gear 122, and the transmission mechanism becomes complicated. As a result, the transmission mechanism becomes complicated, leading to an increase in cost.
Therefore, it can be said that the technique of Patent Document 2 is not suitable for a small cultivator.

  Therefore, an object of the present invention is to provide a cultivator capable of easily configuring a transmission mechanism while having a crosscut arrangement excellent in a residual tillage process.

  The invention according to claim 1 is a cultivator in which a horizontally long support shaft is attached to a lower portion of a body frame, a hollow tillage shaft is rotatably attached to the support shaft, and a tillage claw is provided on the tillage shaft. Is a folding shaft consisting of a central shaft portion, a left shaft portion, and a right shaft portion at the two folding points, and the hollow tillage shaft is a central shaft A drive force input that receives the drive force from the drive source on the central tillage shaft, divided into a left tillage shaft that fits on the left shaft portion, and a right tillage shaft that fits on the right shaft portion A right tiller shaft with a left driven tiller claw and a left tiller nail that rotate around the drive tiller nail only when it is hung on the drive tiller nail. And a right driven tilling nail that rotates around the driving tillage nail only when it is on the driving tilling nail, and a right tilling nail.

  Upon receiving the driving force from the driving source, the central tillage shaft rotates around the central shaft portion, and the drive tillage claw also rotates as the central shaft portion rotates. The left tillage shaft is provided with a left driven tillage nail that rotates around the drive tillage nail only when it is hung on the drive tillage nail, and the left tillage nail is driven only when it is hung on the drive tillage nail. Since the right driven tilling claw and the right tilling claw that are rotated around are provided, it is possible to make a crosscut arrangement in which the driving tilling claws and the left and right driven tilling claws overlap.

Accordingly, since the cross cut arrangement of the tilling claws is realized, it is possible to obtain a tilling claw excellent in the residual tillage processing only by setting the cross cut occurrence position at the lowermost part of the tilling claws.
In addition, since the tillage claw of the present invention has a cross cut arrangement, the transmission mechanism can be easily configured, and thus is suitable for a small tiller with great cost constraints.

  In the invention according to claim 2, the support shaft is attached to the body frame so as to be rotatable around the shaft, and the operation angle provided on the handle provided in the tiller can be operated to change the attachment angle of the support shaft. It is configured as described above.

The support shaft was configured to change the mounting angle of the support shaft by operating an operator provided on a handle provided in the tiller. That is, the support shaft is a bending shaft including a central shaft portion, a left shaft portion, and a right shaft portion, and the support shaft can be changed forward, downward, or rearward.
If you do not want to leave the remaining tillage, set the folding axis downward to effectively perform tilling work focusing on remaining tillage.

In addition, when weeding is the main purpose, if the folding shaft is set forward in order to tear off the grass, etc., the cultivation work focusing on weeding can be effectively performed.
Furthermore, in the case of a field with a lot of stones, if the folding shaft is set rearward so that it is difficult for the stone to bite, the cultivation work can be effectively performed while suppressing the occurrence of the stone bite.
As a result, by moving the position of the cross-cut portion where the tilling claws overlap each other back and forth, the optimum tilling work according to the field conditions can be performed.

In addition, since the position of the crosscut part can be selected, it is possible to easily change to deep plowing, weeding, and plowing with only one-touch operation of the operation element without preparing multiple types of jigs and tilling nails. it can.
As a result, it is possible to carry out the tilling work as intended by the worker very easily.

In the invention according to claim 1, only the drive tillage claw among the plurality of tillage claws is directly driven by the drive source, and the other tillage claws are driven by the drive tillage claws using the crosscut arrangement. .
Conventionally, since all tilling claws were directly driven by a drive source via gears or chains / sprockets, the power transmission mechanism consisting of gears / chains / sprockets became complicated, which increased the cost of the tillers. It was a cause.

  In this respect, in claim 1, since most tilling claws are driven without using a power transmission means comprising gears or chains and sprockets, the power transmission mechanism can be greatly simplified and the cost of the tiller can be reduced. Can be planned.

In the invention according to claim 2, since the support shaft can be changed to the front, the lower, or the rear, the position of the crosscut portion can be moved back and forth.
As a result, optimum tillage work can be performed according to the situation of the field.
In addition, since the position of the crosscut part can be selected, deep plowing, weeding, or plowing can be performed only by one-touch operation of the operator without preparing multiple types of jigs and tilling nails, There is an advantage that it is possible to easily perform the cultivation work as intended by the operator.

  FIG. 1 is a front view of a cultivator according to the present invention. A cultivator 10 includes a cultivating claw 11, a cultivating shaft 12 for attaching the cultivating claw 11, a support shaft 13 for supporting the cultivating shaft 12, and the support shaft. 13 is rotatably supported, and a vehicle body frame 14 extended upward as a fuselage, a drive source 15 placed on top of the vehicle body frame 14, and disposed in front of the drive source 15, an output of the drive source 15 A transmission 16 that plays the role of shifting and outputting the rotation, a handle 17 extending from the upper part of the body frame 14 to the rear, an operator 18 provided on the handle 17, and a support plate fixed to the support shaft 13. 19 and a rod member 21 for connecting the support shaft plate 19 and the operating element 18 are mainly configured.

Reference numeral 22 denotes a fender that protects against mud scraped by the tilling claws, 23 is a guard pipe, 24 is a reinforcement pipe, and 25 is a resistance rod provided to suppress the submersion of the tiller into the field.
The drive source 15 is an engine, and an engine unit 26 is formed by integrally incorporating an intake system, an exhaust system, a fuel tank, and a fuel supply system into the engine.

  The drive system includes an output gear 32 attached to the output shaft 31 of the engine unit 26, an input gear 34 attached to the input shaft 33 of the transmission 16, and a first chain spanned between these gears 32, 34. 35, a TM output gear 37 attached to the output shaft 36 of the transmission 16, a sprocket 38 attached to the tilling shaft 12, and a second chain 39 spanned between the TM output gear 37 and the sprocket 38. .

  2 is a view taken in the direction of the arrow 2 in FIG. 1, and a handle 17 attached to the outside of the vehicle body frame 14 from the front to the rear of the vehicle body, and a throttle for controlling the output rotational speed of the engine unit 26 provided in the handle 17. A lever 41, an operating element 18 that is attached to the inside of the handle 17 and changes the mounting angle of the support shaft 13 (see FIG. 1), and a guide plate 42 that guides the movement of the operating element 18 are provided.

FIG. 3 is a view taken in the direction of the arrow 3 in FIG. 1 and has a plurality of tilling claws 11 for plowing the field, and the tip parts of some of the tilling claws 11 are arranged so as to overlap in front view. This is a cultivator in which a support shaft 13 is provided at the rotation center of the tilling claw 11 and a machine body as a vehicle body frame 14 that supports the support shaft 13 is disposed above the support shaft 13.
The handle 17 is provided with an operator 18 that extends obliquely upward from the left and right body frames 14 and is used to change the mounting angle of the support shaft 13 by being attached to the inside of the handle 17.

The drive system related to the reduction gear output includes a TM output gear 37 attached to the output side of the transmission 16, a sprocket 38 attached to the tillage shaft 12, and a second chain that extends vertically between the TM output gear 37 and the sprocket 38. 39.
The structure around the tillage shaft 12 formed by bending it into a square shape at two locations along the shaft will be described in detail in the next figure.

  4 is a cross-sectional view of the main part of FIG. 3. A horizontally long support shaft 13 is attached to the lower portion 14a of the vehicle body frame, and a hollow tillage shaft 12 is rotatably attached to the support shaft 13, and a tilling claw is attached to the tillage shaft 12. 11, the central shaft portion 51 of the support shaft 13 is disposed substantially parallel to the field G of the field, and the left and right end portions 52L and 52R of the central shaft portion 51 are connected to the front end of the body frame. The left and right extending shaft portions 53L and 53R extend downwardly from the left and right end portions 52L and 52R toward the outermost end, and are driven to the central shaft portion 51 of the support shaft 13 by being supported by the portions 14a and 14a. A central tillage shaft 57 that rotates around the central shaft portion 51 and is attached with drive tillage claws 56L and 56R is provided by the driving force of the second chain 39 that is one of the side chains, and the left and right extending shafts of the support shaft 13 are provided. Drives the drive tillage claws 56L, 56R to the parts 53L, 53R By a Hidarinobe 設軸 portion 53L, and rotates around the right extension 設軸 unit 53R, the left and right driven tilling claws 61L, cultivating shaft of right and left wearing the 61R 62L, disposing 62R.

  That is, the support shaft 13 provided in the tilling device 60 is bent into a square shape at two locations along the shaft, and the central shaft portion 51, the left extending shaft portion 53L, and the right extending shaft are bounded by two bending points. This is a bending shaft 63 formed of a portion 53R, and is a member that is attached to the vehicle body frame 14 so as to be rotatable around the axis.

  The hollow tillage shaft 12 is divided into a center tillage shaft 57 that fits into the center shaft portion 51, a left tillage shaft 62L that fits into the left extending shaft portion 53L, and a right tillage shaft 62R that fits into the right extending shaft portion 53R. In this configuration, the central tillage shaft 57 includes a sprocket 38 as a driving force input member that receives a driving force from a driving source and eggplant-shaped driving tillage claws 56L and 56R, and the left tillage shaft 62L has a driving tillage. The left driven tillage claw 61L and the left tillage claw 66L rotate around the drive tillage claw 56L only when it is hooked on the claw 56L. The right tillage shaft 62R is moved to the drive tillage claw 56R only when it is hung on the drive tillage claw 56R. A right driven tilling claw 61R that rotates and a right tilling claw 66R are provided.

  FIG. 5 is a principle diagram (perspective view) of a tillage claw driving force transmission mechanism according to the present invention. The transmission mechanism is a support shaft 13B and a tillage shaft 12B disposed on the back side of the support shaft 13B and having a driving force. And a driven claw 61B disposed on the front side of the figure. The driven claw 61B is a member that is freely attached to the support shaft 13B. The axis of the drive claw 56B and the axis of the driven shaft 61B are the same.

Hereinafter, a case where the driving claw 56B hits the driven claw 61B in a substantially horizontal portion in front of the figure will be considered.
The cultivating shaft 12B rotates, the driving claw 56B integrated with the cultivating shaft 12B is rotated in the direction of the arrow L1, and the side surface 68 of the tip provided in the driving claw 56B is brought into contact with the side 69 of the tip provided in the driven claw 61B.

FIG. 6 is a principle diagram (front view) of the tillage claw driving force transmission mechanism according to the present invention. Both the driving claw 56B and the driven claw 61B have a cross-like shape when viewed from the front. The driven claw 61B is driven by hitting the side surface 69 of the distal end of the driven claw.
As a result, the driven claw 61B is rotated in the direction of the arrow L1 by the driving force of the driving claw 56B.

FIG. 7 is an explanatory diagram of a tilling claw driving force transmission mechanism according to the present invention. The difference from FIG. 6 is that the shape of the driving claw and the driven claw is changed to an actual tilling claw, and the driving cultivation claw 56 is a driven tilling claw The point corresponding to 61 is the lowest point.
The driven tillage claw 61 is a member that is freely attached to the support shaft 13 (see FIG. 4), and the axis center of the drive tillage claw 56 and the axis center of the driven tillage claw 61 are the same.

(A) shows the state before the drive tillage nail 56 hits the driven tillage nail 61.
(B) is a B arrow view of (a), and shows that the drive tillage claw 56 has not reached the state where it hits the driven tillage claw 61.

(C) shows a state in which the drive tillage claw 56 hits the driven tillage claw 61.
(D) is a view from arrow D in (c), where the drive tillage claw 56 and the driven tillage claw 61 are substantially overlapped, and the side surface 71a of the tip of the drive tillage nail is in contact with the side surface 72a of the tip of the driven tillage nail. .

  The driven tilling claw 61 after hitting is rotated in the direction of the arrow L2 along with the driving tilling claw 56 by the driving force of the driving tilling claw 56. Since the axis center of the drive tillage claw 56 and the axis center of the driven tillage shaft 61 are the same, the drive tillage claw 56 and the driven tillage shaft 61 rotate while being rotated.

  Therefore, by tilting the driven tilling shaft of the driven tilling claw 61 with respect to the central tilling shaft having the driving tilling claw 56, the driving tilling claw 56 and the driven tilling claw 61 rotate while touching or coming off from each other. be able to.

  The reason why the tillage work does not continue without the tip of the drive tillage nail 56 hitting the tip of the follower tillage nail 61 is that the follower tillage nail 61 always bites the surface of the field, and the follower moves with the movement of the tiller. This is because the tilling claw 61 rotates.

  However, the contact of the drive tillage nail 56 with the driven tillage nail 61 is only a limited angle range at the lowest point, and therefore, in order to ensure a predetermined tillage performance, The number of sheets can be increased as appropriate.

  FIG. 8 is a perspective view of the operating portion of the drive shaft rotating mechanism according to the present invention. Brackets 75L and 75R are attached to the left and right of the handle 17, and the operating element 18 including the operating element shaft 76 is sandwiched by the brackets 75L and 75R. To do.

  A connecting piece 77 is attached downward from the operating element shaft 76, and the rod member 21 is attached to the connecting piece 77 via a pin member 78 so as to be rotatable. Then, the arm member 79 is spanned between the operation element shaft 76 and the horizontal axis 18 b constituting the operation element 18. The arm member 79 is a member composed of an upper cylindrical portion 81, a shaft portion 82, and a lower cylindrical portion 83. The shaft portion 82 is passed through a guide hole 42 h formed in the guide plate 42, the upper cylindrical portion 81 is passed through the horizontal shaft 18 b of the operating element 18, and the lower cylindrical portion 83 is passed through the operating element shaft 76.

  9 is a cross-sectional view taken along the line 9-9 in FIG. 8. The collar member 84 is fixed to the operating element shaft 76, the spring 85 is passed to the left side of the collar member 84, and the lower cylindrical portion 83 is passed from the left side of the spring 85, A connecting piece 77 is attached from below the operating element shaft 76, and the rod member 21 is rotatably attached via a pin member 78 composed of a bolt 86 and a nut 87.

  Next, the shaft portion 82 fixed to the lower cylindrical portion 83 is passed through the guide hole 42h of the guide plate 42, the shaft portion 82 is passed through the guide hole 42h, and then the arm member 79 is configured on the horizontal shaft 18b of the operation element 18. An arm member 79 is formed by passing the upper cylindrical portion 81 and fixing the upper cylindrical portion 81 and the shaft portion 82 together.

The shaft portion 82 constituting the arm member 79 is normally subjected to a force in the direction of FIG. G by the reaction force of the spring 85, is regulated by a part of the guide hole 42h, and is one of three positions forming the guide hole 42h. Stop on.
The rod member 21 is moved back and forth by moving the shaft portion 82 constituting the arm member 79 in the reverse direction of the figure while pushing it in the direction opposite to the arrow G.
The mounting angle of the support shaft 13 (see FIG. 4) can be changed by operating the operating element 18 provided on the handle provided in the tiller.

  FIG. 10 is an explanatory view of the rotating portion of the drive shaft rotating mechanism according to the present invention. The support shaft 13 is supported so as to be rotatable with respect to the vehicle body frame, and the axis of the support shaft 13 is supported on the support shaft 13. A spindle plate 19 that rotates integrally with the spindle 13 is provided at the center. Then, an operating element 18 (see FIG. 8) for rotating the spindle plate 19 is provided on the handle 17 via a rod member 21.

  That is, the support shaft 13 is attached to the vehicle body frame 14 so as to be rotatable about the shaft, and the operation angle 18 provided on the handle 17 provided in the tiller can be operated to change the attachment angle of the support shaft 13. Configured.

Hereinafter, in (a), (b), and (c), reference numeral 91 denotes a position where the drive tilling claw 56 hits the driven tilling claw 61, and a cross cut portion 92 that serves as a cross cut occurrence position.
Reference numeral 93 denotes a trajectory of the driving tilling claw tip, and 94 denotes a trajectory of the driven tilling claw tip.

(A) is explanatory drawing when the support shaft 13 is changed to the front, and the crosscut portion 92 is set forward, so that weeds prospered on the surface of the field in the front as compared with the case where it is set downward. This makes it possible to perform tillage work with an emphasis on weeding.
(B) is an explanatory view when the support shaft 13 is changed downward, and the crosscut portion 92 is set downward, so that when the residual tillage is not desired, the tilling work can be performed with emphasis on the remaining tillage processing. .

  (C) is an explanatory view when the support shaft 13 is changed to the rear, and the crosscut portion 92 is set to the rear, so that in the case of a field with a mixture of stones, the tilling nail may hit a foreign object such as a stone. Plowing work can be performed while suppressing the occurrence of stone biting.

In the support shaft 13, there is no particular restriction on the inter-axis pitch P between the central shaft portion 51 and the extended shaft portion 53.
In the present embodiment, the angles of the cross cut portion 92 with respect to the vertical axis, that is, θf and θb are each set to 15 °, but may be set to angles other than 15 °.

FIG. 11 is an operation diagram of the drive shaft turning mechanism, and shows that the cross cut portion 92 can be changed downward, forward, or backward by shifting the operation element 18 attached to the handle.
(A) shows that the arm member 79 of the operating element is moved from the lower position 96 in the direction of the figure X to the lower neutral position 96N.
In (d), when the arm member 79 of the operating element is in the lower position 96 or 96N, the support shaft 19 fixed to the support shaft 13 is in a position facing downward.

(B) moves the arm member 79 of the operating element from the lower neutral position 96N, moves the horizontal axis 18b of the operating element 18 in the Y direction in the figure, removes the force applied to the arm member 79 constituting the operating element 18, and the rear neutral position. This indicates that the rear position 97 is set via 97N.
(E) shows that the support plate 19 fixed to the support shaft 13 is positioned rearward when the arm member 79 of the operating element is at the rear position 97.

(C) The arm member 79 of the operating element is set to the rear neutral position 97N, the horizontal shaft 18b of the operating element is moved in the direction opposite to the Y direction in the figure, the force applied to the arm member 79 of the operating element is removed, and the front position 98.
In (f), when the arm member 79 of the operating element is at the front position 98, the support shaft 19 fixed to the support shaft 13 is in a position facing forward.

Since the position of the cross-cut portion 92 can be selected, deep plowing, weeding, and plowing can be performed only by one-touch operation of the operation element 18 without preparing a plurality of types of jigs and tilling claws.
As a result, it is possible to easily perform tillage work as intended by the operator.

  Returning to FIG. 4, upon receiving the driving force from the driving source, the central tillage shaft 57 rotates around the central shaft portion 51, and the drive tillage claws 56 </ b> L and 56 </ b> R also rotate as the central tillage shaft 57 rotates. The left tillage shaft 62L is provided with a left driven tillage claw 61L that rotates around the drive tillage claw 56L only when it is engaged with the drive tillage claw 56L, and a left tillage claw 66L. Since the right driven tilling claw 61R and the right tilling claw 66R are rotated around the driving tilling claw 56R only when it is hooked, the driving tilling claw 56L and the driven tilling claw 61L, and the driving tilling claw 61R and the driven tilling claw 61R overlap. A cross cut arrangement can be used.

  Accordingly, since the crosscut arrangement of the tilling claws is realized, it is possible to obtain a tilling claw excellent in the remaining tillage processing only by setting the crosscut generation position at the lowest part of the tilling claws.

In the invention according to claim 1, only the drive tillage claw among the plurality of tillage claws is directly driven by the drive source, and the other tillage claws are driven by the drive tillage claws using the crosscut arrangement. .
Conventionally, since all tilling claws were directly driven by a drive source via gears or chains / sprockets, the power transmission mechanism consisting of gears / chains / sprockets became complicated, which increased the cost of the tillers. It was a cause.

In this respect, in claim 1, since most of the tilling claws are driven without using the power transmission means comprising gears or chains and sprockets, the power transmission mechanism can be greatly simplified and the cost of the tiller can be reduced. Can be planned.
In addition, since the tillage claw of the present invention has a cross-cut arrangement, the transmission mechanism can be simply configured, so that it can also be applied to a small tiller with great cost constraints.

  In addition, in the present Example, the cultivator according to the present invention was applied to a small cultivator for a home garden, but it is not necessary to be a cultivator of this class.

  The present invention is suitable for a field cultivator.

It is a front view of the field cultivator concerning the present invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1. It is principal part sectional drawing of FIG. It is a principle figure (perspective view) of the tilling nail driving force transmission mechanism concerning the present invention. It is a principle figure (front view) of the tilling nail driving force transmission mechanism concerning the present invention. It is explanatory drawing of the tilling nail drive force transmission mechanism which concerns on this invention. It is a perspective view of the operation part of the drive shaft rotation mechanism which concerns on this invention. FIG. 9 is a sectional view taken along line 9-9 in FIG. 8. It is explanatory drawing of the rotation part of the drive shaft rotation mechanism which concerns on this invention. It is an effect | action figure of a drive shaft rotation mechanism. It is a schematic diagram of the conventional tilling nail | claw part. It is a schematic diagram of a conventional tillage claw transmission mechanism.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Tiller, 11 ... Tilling claw, 12 ... Tilling shaft, 13 ... Support shaft, 14 ... Body frame, 15 ... Drive source, 17 ... Handle, 18 ... Operator, 19 ... Support plate, 38 ... Sprocket, 51 ... center shaft portion of the support shaft (13), 53L, 53R ... extension shaft portion of the support shaft (13), 56L, 56R ... drive tillage nail, 57 ... center tillage shaft, 61L, 61R ... driven tillage nail, 62L, 62R ... Tilling shaft, 63 ... Folding shaft, 66 ... Tilling claw.

Claims (2)

In a field cultivator in which a horizontally long support shaft is attached to the lower part of the body frame, a hollow tillage shaft is rotatably attached to the support shaft, and a tillage claw is provided on the tillage shaft.
The support shaft is a bending shaft composed of a central shaft portion, a left shaft portion, and a right shaft portion, which is bent at two points in the middle of the shaft and bordered by two bending points,
The hollow tillage shaft is divided into a central tillage shaft that fits into the center shaft portion, a left tillage shaft that fits into the left shaft portion, and a right tillage shaft that fits into the right shaft portion.
A driving force input member that receives a driving force from a driving source on the central tillage shaft, and a nail-like driving tillage nail,
The left tillage shaft, the left driven tillage nail that rotates with the drive tillage nail only when it is hooked on the drive tillage nail, and the left tillage nail,
A cultivator comprising: a right driven cultivating claw that rotates around the right cultivating claw only on the right cultivating claw; The support shaft is rotatably attached to the vehicle body frame, and is configured such that an attachment angle of the support shaft can be changed by operating an operator provided on a handle provided in a tiller. The cultivator according to claim 1.

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