SPECIFICATION

Title of Invention

ROTARY TILLER Technical Field

[0001]

The present invention relates to a rotary tiller having a tilling pawl attached to
a flange of a pawl shaft.

Background Art

[0002]

As a rotary tiller having a tilling pawl attached to a flange of a pawl shaft, as disclosed in Japanese Unexamined Patent Publication JP-A2008-22716, a plurality of flanges are provided in a pawl shaft direction on an outer circumference of a pawl shaft that is supported by a rotary machine frame so as to be freely rotatable about a shaft axis, and each of the flanges has a plurality of tilling pawls attached thereto in a circumferential direction.

[0003]
Further, in a side drive rotary tilling device disclosed in Japanese Unexamined Patent Publication JP-A2004-141061, multiple pawl brackets each having a fitting recess at a tip end thereof are provided to be projected in a radially outward direction on an outer circumferential surface of a tilling shaft that is supported so as to be freely rotatable about a shaft axis and a proximal end of the tilling pawl fitted to the fitting recess is fixed to the pawl bracket with a bolt, and in order to prevent long stems such as weeds from winding about the tilling shaft, a long sized linear member is bridged in separation from the tilling shaft between the tilling pawls separated from each other in the axial, direction of the tilling shaft.

Summary of Invention Technical

Problem [0004]

In the rotary tiller disclosed in the JP-A2008-22716, since the flange is formed by externally fitting a plate member onto an outer circumference of a rotating shaft, the flange becomes an obstacle and it becomes difficult to adopt a technique applied in the JP-A2004-141061, that is, to attach the long sized linear member to a position which is comparatively near the pawl shaft and separated from the pawl shaft in order to prevent long stems such as weeds from winding about the tilling shaft.

[0005]
Therefore, an essential object of the present invention is to provide a rotary tiller capable of solving such a conventional technical problem.

More specifically, the present invention is aimed to provide a rotary tiller allowing a linear member for preventing weeds from winding to be attached to a vicinity of an outer circumference of a pawl shaft in a rotary tiller having a tilling pawl attached to a flange.

Solution to Problem

[0006]
Specific means of the present invention for solving the problem are as following.

[0007]
In a first aspect of the present invention, a rotary tiller includes: a plurality of flanges 4 provided in a pawl shaft direction on an outer circumference of a pawl shaft 3 supported so as to be freely rotatable about a shaft axis of a rotary machine frame 10, each flange 4 having a tilling pawl 2 attached thereto.

In this configuration, there is provided a linear member 6 for preventing winding of weeds, extending between the flanges 4 located at both ends of the pawl shaft 3, and through holes 5 are formed so as to penetrate the flanges 4 located at both ends of the pawl shaft 3 in the pawl shaft direction, the ends of the linear member 6 are inserted through the through holes 5, and stopper means 7 is provided at both of the ends of the linear member 6 for preventing the linear member 6 from slipping off the through holes 5 in the pawl shaft direction.

[0008]
In a second aspect of the present invention, the through holes 5 are formed so as to penetrate intermediate flanges 4 located between the flanges 4 located at both ends of the pawl shaft 3 in the pawl shaft direction, and the linear member 6 is inserted through the through holes 5 formed in all the flanges 4.

[0009]
In a third aspect of the present invention, the through holes 5 of all the flanges 4 are arranged in a straight line state substantially parallel to the pawl shaft -3 .

[0010]
In a fourth aspect of the present invention, the flanges 4 respectively having the tilling pawls 2 attached thereto are fixed to the pawl shaft 3 so that the flanges 4 adjacent to each other in the pawl shaft direction have their tilling pawls 2 with their phases shifted in a circumferential direction, the respective flanges 4 having the through holes 5 formed in positions corresponding to the shifts of all the tilling pawls 2, and the linear member 6 is inserted to pass through all the flsnass 4 in a substantial! v strainht linfs stai-o

[0011]
In a fifth aspect of the present invention, the through holes 5 of all the flanges 4 are arranged around the pawl shaft 3 in a spiral state.

[0012]
In a sixth aspect of the present invention, the through hole 5 of each flange 4 is a round hole formed in a radially inner side than an attachment base 8 of the tilling pawl 2.

[0013]
In a seventh aspect of the present invention, the through hole 5 of each flange 4 is formed by forming a notched recess 50 in a radially inward direction from an outer circumference of the flange 4 and closing an opening side of the notched recess 50 with an attachment base 8 of the tilling pawl 2.

[0014]
In an eighth aspect of the present invention, the stopper means 7 is configured of a male screw 7a formed at least at one end of the linear member 6 and a nut 7b screwed with the male screw (7a).

[0015]
In a ninth aspect of the present invention, the stopper means 7 is formed of a bent portion 7c formed by bending at least one end of the linear member 6 or an enlarged portion 7d formed by radially enlarging the same.

[0 016]
In a tenth aspect of the present invention, a side frame 11 configuring the rotary machine frame 10 has an insertion hole 11a formed in correspondence with the through hole 5 of the flange 4 so that the linear member 6 is inserted to the insertion hole 11a from the outward of the side frame 11. [0017]
In an eleventh aspect of the present invention, each of the flanges 4 is formed of a.ring-like disk shaped plate member and each of the flanges 4 is provided with a plurality of leftward bent tilling pawls 2L and rightward bent tilling pawls 2R in pairs at intervals in the circumferential direction. [Effect of the Invention] [0018]
According to the first aspect of the present invention, since a linear member 6 for preventing winding of weeds, extending between the flanges 4 located at both ends of the pawl shaft 3, and through holes 5 are formed so as to penetrate the flanges 4 located at both ends of the pawl shaft 3 in the pawl shaft direction, the ends of the linear member 6 are inserted through the through

holes 5, and stopper means 7 is provided at both of the ends of the linear member 6 for preventing the linear member 6 from slipping off the through holes 5 in the pawl shaft direction, the linear member 6 can be easily provided in the flange 4 to which the tilling pawl 2 is attached, whereby winding of weeds about the pawl shaft
3 can be prevented.
[0019]
According to the second aspect of the present
invention, since the through holes 5 are formed so as to penetrate intermediate flanges 4 located between the flanges 4 located at both ends of the pawl shaft 3 in the pawl shaft direction, and the linear member 6 is inserted through the through holes 5 formed in all the flanges 4, the linear member 6 can be inserted to all the flanges 4 on the pawl shaft 3 and attached, the linear member 6 can be easily inserted to the pawl shaft 3. [0020]
According to the third aspect of the present invention, since the through holes 5 of all the flanges
4 are arranged in a straight line state substantially
parallel to the pawl shaft 3, the insertion of the linear
member 6 to all the flanges 4 on the pawl shaft 3 can
be extremely easily performed.
[0021]

According to the fourth aspect of the present invention, since the flanges 4 respectively having the tilling pawls 2 attached thereto are fixed to the pawl shaft 3 so that the flanges 4 adjacent to each other in the pawl shaft direction have their tilling pawls 2 with their phases shifted in a circumferential direction, the respective flanges 4 having the through holes 5 formed in positions corresponding, to the shifts of all the tilling pawls 2, and the linear member 6 is inserted to pass through all the flanges 4 in a substantially straight line state, all the flanges 4 can be formed in the same shape. [0022]
According to the fifth aspect of the present invention, since the through holes 5 of all the flanges 4 are arranged around the pawl shaft 3 in a spiral state, it becomes possible to arrange the linear member 6 along the arrangement of the tilling pawls 2 on the pawl shaft 3. [0023] '
According to the sixth aspect of the present invention, since the through hole 5 of each flange 4 is a round hole formed in a radially inner side than an attachment base 8 of the tilling pawl 2, processing of the though hole 5 in the flange 4 can be easily performed.

[0024]
According to the seventh aspect of the present invention, since the through hole 5 of each flange 4 is formed by forming a notched recess 50 in a radially inward direction from an outer circumference of the flange 4 and closing an opening side of the notched recess 50 with an attachment base 8 of the tilling pawl 2, the linear member 6 can be inserted to the through hole 5 from the outer circumferential side of the flange 4 and the linear member 6 can be prevented from slipping off the flange 4 in the radially outward direction by the attachment base 8 of the tilling pawl 2.
[0025]
According to the eighth aspect of the present invention, since the stopper means 7 is configured of a male screw 7a formed at least at one end of the linear member 6 and a nut 7b screwed thereto, stopping and tension adjustment of the linear member 6 with respect to the flange 4 can be simply and easily performed.
[0026]
According to the ninth aspect of the present invention, since the stopper means 7 is formed of a bent portion 7c formed by bending one end of the linear member
c
6 or an. enlarged portion 7d formed by radially enlarging the same, the stopper means 7 can be easily formed at

a low cost. [0027]
According to the tenth aspect of the present invention, since a side frame 11 configuring the rotary machine frame 10 has an insertion hole 11a formed in correspondence with the through hole 5 of the flange 4 so that the linear member 6 is inserted to the insertion hole 11a from the outer side of the side frame 11, even in the case of using a steel rod as the linear member 6, the linear member 6 can be inserted to the through hole 5 of the flange 4 from the outer side of the side frame 11. [0028]
According to the eleventh aspect of the present invention, since each of the flanges 4 is formed of a ring-like disk shaped plate member and each of the flanges 4 is provided with a plurality of leftward bent tilling pawls 2L and rightward bent tilling pawls 2R in pairs at intervals in the circumferential direction, multiple L type pawls can be installed on the flange 4 to which the linear member 6 for preventing weeds from winding is attached.
Brief Description of Drawings [0029]
Fig. 1 is a cross-sectional rear view of an entire

part of a rotary tiller showing one embodiment of the present invention;
Fig. 2 is a side view of the rotary tiller;
Fig. 3 is a cross-sectional rear view of a main part of the same;
Fig. 4 is a side view of each flange;
Fig. 5 is a side view of a tilling part showing a second embodiment of the present invention;
Fig. 6 is a cross-sectional rear view of the same main part;
Fig. 7 is a side view of each flange;
Fig. 8 is a side view of a tilling part showing a third embodiment;
Fig. 9 is a cross-sectional rear view of the same main part; and
Fig. 10 is an entire side view showing a rotary tiller installed in a tractor body. Description of Embodiments [0030]
The following describes an embodiment of the present invention with reference to the drawings.. [0031]
In Figs. 1 to 4 and 10, a side drive rotary tiller 1 pertaining to a first embodiment of the present invention is shown, and this rotary tiller- 1 is coupled

to a rear of a tractor body 100 via a three-point link mechanism 26 so as to be vertically movable. [0032]
In the rotary tiller 1, right and left support arms 15 are protruded sideward from a gear case 12, a transmission case 17 and a side frame 11 are respectively attached to outer edges of the right and left support arms 15 to thereby configure a rotary machine frame 10, and a pair of right and left rotating short shafts 19 are provided beneath the transmission case 17 and side frame 11, and a pawl shaft 3 is connected between the right and left rotating short shafts 19. [0033]
The rotary machine frame 10 is provided with a pair of right and left support stays 25 and mast 29, and rear ends of a pair of right and left lower links 28 of the three-point link mechanism 26 are coupled to the right and left support stays 25, and a top link 27 is coupled to the mast 29. [0034]
Power transferred from a PTO (power take-off) shaft 30 of the tractor body 100 to an input shaft 13 via a joint 31 drives the rotating short shaft 19 and pawl shaft 3 by transmission chain transfer means 18 within the transmission case 17 via a gear 14 within the gear case

12 and a transmission shaft 16 within the left support arm 15. Multiple tilling pawls 2 are fixed to the pawl shaft 3 via a plurality of flanges 4 and these members 2, 3 and 4 form a tilling part K. Thus, the pawl shaft 3 is driven to be rotated in a direction of an arrow mark A shown in Figs. 2 and 10. [0035]
The rotary machine frame 10 includes: a pair of right and left side plates 23 respectively fixed to inner surfaces of the transmission case 17 and side frame 11; and a front frame member 31 connecting the front parts of the right and left side plates 23. A main cover 21 for covering over the tilling part K is installed on the right and left side plates 23 and front frame member 31. A generally central portion of the main cover 21 is supported by the gear case 12 via a fixing member 24. [0036]
The right and left support stays 25 are provided on the front frame member 31 and main cover 21 and the mast 29 is supported by the right and left support stays 25. A rear cover (not shown) covering a rearward of the tilling part K is pivoted by a rear part of the main cover 21. Rear side covers 22 covering a sideward rear side of the tilling part K are provided on the rearward sides of the transmission case 17 and side frame 11 and the

right and left side plates 23. [0037]
Right and left skids 20 for adjusting tilling depth are attached to the side frame 11 and transmission case 17 so as to be adjustable in vertical position and freely detachable. Note here that only any one of the right and left skids 20 may be provided. [0038]
In Figs. 1 to 4, the pawl shaft 3 is a cylindrical rotating shaft and it is provided with multiple flanges 4 at constant intervals in the axial direction and six tilling pawls 2 are fastened to one of the surfaces of each flange 4 with bolts B and nuts N. [0039]
It is noted that Figs. 4 (a) to (f) correspond to notations (a) to (f) shown in Fig. 1. For example, the flange 4 in Fig. 4 (b) has its phase respectively displaced by 20°in the circumferential direction with respect to the flanges 4 in Figs. 4(a) and 4(c). [0040]
The flange 4 is a plate-like member formed to have a ring-like disk shape. In this configuration, a hole in a central portion thereof is fitted for the pawl shaft 3 and six pairs of attachment holes 4a for installing six tilling pawls 2 are provided in an outer

circumferential side at predetermined intervals in the circumferential direction. One pair thereof is formed of two attachment holes 4a with which one tilling pawl 2 is attached. Thus, respectively three rightward and three leftward, i.e., total six tilling pawls 2 are attached to the flange 4. [0041]
As shown in Figs. 1 to 4, the tilling pawl 2 is an L type shaped pawl bending toward a side of the transmission case 17 or a side of the side frame 11 as it goes from the vicinity of the center to the most tip end side in front view. An attachment hole 2a is formed in an attachment base 8 of the tilling pawl 2 for fixing the tilling pawl 2 to the flange 4. [0042]
Hereafter, a tilling pawl 2 bending toward the side of the transmission case 17 denotes a leftward tilling pawl 2L and a tilling pawl 2 bending toward the side of the side frame 11 denotes a rightward tilling pawl 2R. These leftward and rightward tilling pawls 2L and 2R are alternately arranged in the circumferential direction in one side surface of the flange 4. And one pair of the tilling pawls 2 is formed of one leftward tilling pawl 2L and one rightward tilling pawl 2R, and three pairs of leftward and rightward tilling pawls 2L and 2R are

arranged in the flange 4 so that the leftward tilling pawl 2L and rightward tilling pawl 2R in each pair are displaced by 120°. [0043]
Further, two sets of round through holes 5, one set including six through holes 5, i.e., total.twelve through holes 5 are formed in the flange 4 in positions displaced by generally 180°about the pawl shaft 3 for inserting through a linear member 6 for preventing weeds from winding in a radially inner side from the attachment holes 4a. The six through holes 5 in each set are formed at positions which are displaced by 20°in the circumferential direction, and this configuration corresponds to the phases of all the six flanges 4, whereby one of the six through holes 5 in each of the six flanges 4 is to be aligned on one straight line parallel to the pawl shaft 3. [0044]
In specific, two sets of through holes 5, one set including six through holes 5, in position displaced by generally 180°are formed in the flange 4, and as shown in Figs. 4(a) to 4(f), the through holes 5 positioned in the same phase in the circumferential direction of the pawl shaft are aligned on one straight line and one pair thereof is to be formed in the positions which are

displaced by 180°in the circumferential direction. Thus, it becomes possible to insert two straight linear members 6 in parallel to the pawl shaft 3 through the through holes 5. [0045]
By forming the six sets of attachment holes 4a and two sets of through holes 5, one set including six through holes, in each flange 4, in the case where all the flanges 4 are formed in the same shape and fixed with.their phases respectively displaced by 20° with respect to the pawl shaft 3, it becomes possible to attach the leftward and rightward tilling pawls 2L and 2R and insert the straight linear members 6. [0046]
The linear member 6 is composed of a bar member (steel rod) or a long-sized wire member which are slightly shorter than the pawl shaft 3 and slightly longer than a distance between the flanges 4 located at both outer ends of the pawl shaft 3, and male screws 7a are formed at both ends of the linear member 6. By screwing two nuts 7b to the male screws 7a from the outsides of the flanges 4 located at both outer ends of the pawl shaft 3, stopper means 7 is configured for preventing the linear member 6 from slipping off inwardly in the pawl shaft direction. This stopper means 7 can apply a tensile force and adjust

a tension of the linear member 6 by adjusting a position
of the nuts 7b.
[0047]
In the side frame 11 of the rotary machine frame 10, there is one insertion hole 11a in correspondence with the through holes 5 to be aligned through all the ' flanges 4. [0048]
In the case where the linear member 6 is composed of steel rod or wire which is hard to be bent, the linear member 6 is moved in parallel to the pawl shaft 3 while inserting through the insertion hole 11a from the outward of the side frame 11 and then it is inserted through the through holes 5 which are aligned through all the flanges 4. Then the male screws 7a are arranged in a state of protruding the male screws 7a outwardly from the flanges 4 located at both ends, and the nuts 7b are screwed to be fastened with the protruded male screws 7a located at both ends, whereby the both ends of the linear member 6 are made in a slip-off prevention state and then the linear member 6 is installed to the flanges 4. [0049]
In the case where the linear member 6 is a bendable or flexible wire, the linear member 6 can be inserted through the through holes 5 of all the flanges 4 from

the underside of the side frame 11 without using the insertion hole 11a formed in the side frame 11. [0050]
The linear member 6 in a state of being bridged over through all the flanges 4 is arranged in a position radially separated outward from the pawl shaft 3 but comparatively near the same. Thus, it is possible to prevent weeds possibly winding the pawl shaft 3 from winding at the time of tilling, and even in the case of occurrence of the winding, since the pawl shaft 3 and the linear member 6 are separated from each other, the weeds can be easily cut by entering a blade in the space between the pawl shaft 3 and the linear member 6. [0051]
A rotary tiller pertaining to the second embodiment of the present invention is shown in Figs. 5 to 7. The second embodiment is different from the first embodiment in a point of forming the through hole 5 of the flange 4 and forming the stopper means 7. [0052]
In the flange 4, there are formed two notched recesses 50. in positions mutually displaced by 180°in the circumferential direction. Each of these notched recesses 50 is formed in an intermediate position between a pair of attachment holes 2a to which the attachment

base 8 of the tilling pawl 2 is fastened, by notching from an outer circumference to a radially inner side than, the attachment holes 2a. The notched recess 50 has a front and rear walls in the rotational direction and a bottom, and it has a length such that, when the attachment base 8 of the tilling pawl 2 is installed on the flange 4 with a bolt B, an opening side of the notched recess 50 is closed while the bottom remains. [0053]
When the attachment base 8 of the tilling pawl 2 is attached to the flange 4, the notched recess 50 is closed by the attachment base 8 while the bottom of the notched recess 50 remains to form the through hole 5 for inserting the linear member 6 therethrough. [0054]
The linear member 6 is inserted into the notched recesses 50 from the outer circumferential sides of all the flanges 4 prior to attaching the tilling pawls 2 and the attachment bases 8 of the tilling pawls 2 are attached to each of the flanges 4, whereby disengagement of the linear member 6 from the notched recess 50 can be prevented. Each of the notched recesses 50 in which the linear member 6 entered to reach the bottom thereof is closed by the attachment base 8 in a state of leaving a space of the bottom portion remaining, whereby the

linear member 6 is in a state of passing through the through holes 5. [0055]
As shown in Fig. 6, both ends of the linear member
6 are flattened to be enlarged to thereby form enlarged
parts 7d. Thus, the enlarged parts 7d configure the
stopper means 7 for preventing the linear member 6 from
slipping off inwardly in the pawl shaft direction from
the through holes 5 of the flanges 4 positioned at both
of the outer end sides in the pawl shaft direction.
[0056]
In this second embodiment, each flange 4 has six pairs of attachment holes 4a and a pair of notched recesses 50 for forming the through holes, and all the flanges 4 previously formed in the same shape are fixed with their phases respectively displaced by 20°with respect to the pawl shaft 3 as shown in Figs. 7(a) to
7 (f) , thereby allowing the leftward and rightward tilling
pawls 2L and 2R to be attached and the linear member 6
to be inserted at the same time.
[0057]
Since the notched recesses 50 of all the flanges 4 are respectively displaced by 20°, the linear member 6 is not formed in parallel to the pawl shaft 3 but in a spiral shape. Therefore, a slightly bendable long bar

member or a long-sized wire member is used as the linear member 6. [0058]
A rotary tiller pertaining to a third embodiment of the present invention is shown in Figs. 8 and 9. The third embodiment is different from the second embodiment in a point of forming the stopper means 7 at the ends of the linear member 6. In this embodiment, bent portions 7c are formed by bending both ends of the linear member 6 at the outsides of the flanges 4 positioned at both ends to thereby configure the stopper means 7 . [005 9]
The linear member 6 is inserted into the notched recesses 50 from the outer circumferential sides of all the flanges 4 prior to attaching the tilling pawls 2 and the attachment bases 8 are attached to each of the flanges 4, whereby disengagement of the linear member 6 from the notched recess 50 can be prevented. The linear member 6 entered to reach the bottom of the notched recesses 50 is prevented from moving in a radially outward direction of the pawl shaft 3 by the attachment base 8 of each of the tilling pawls 2. Thus, the bent portions 7c of the both ends of the linear member 6 are prevented from slipping off the through holes 5 of the flanges 4 inwardly in the pawl shaft direction.

[0060]
It is noted that, the shapes of the respective members, front and rear, right and left, and upper and lower relationships are the best mode in the case of the configuration shown in Figs. 1 to 9. However, the present invention should not be limited to the above embodiments, and various modifications of the members and configurations can be made or combination of the members and configuration can be changed.

[0061]
For example, only one tilling pawl 2 may be attached to the flange 4, or two pairs thereof may be provided with their phases displaced by 180° . Further, a hatchet pawl (C type pawl) may be used instead of the L type pawl. In the case where the number of the attached tilling pawls 2 is few, the outer circumferential shape of the flange 4 may be elliptical.

[0062]
The number of the linear member 6 to be provided may be one, and also may be three or more. The stopper means 7 provided at both ends of the linear member 6 may be configured by using any of the configurations of the first to third embodiments as the one end side of the linear member 6 and the other end side thereof has a configuration of the first to third embodiments different from the one end side, and further the enlarged part 7d may be formed by crimping a tube body at the end of the linear member 6.

[0063]
Although the notched recess 50 configuring the through hole 5 is positioned in the center of a pair of attachment holes 2a, it may be formed in a position shifted from the center.

[0064]
There may be arranged an auxiliary flange 4 and tilling pawl 2 in the outer end side in the pawl shaft direction than all the flanges 4 to which the linear member 6 of the pawl shaft 3 is attached.

[0065]
In addition, although the linear member 6 made of a bar member or a wire member for preventing weeds from winding is provided between the flanges 4 located at both ends of the pawl shaft 3, in addition to inserting one linear member 6 to pass through all the flanges 4, the linear member 6 between the flange 4 positioned at the end of the pawl shaft 3 and a flange 4 adjoining thereto and a linear member 6 provided between the intermediate flanges 4 between the flanges 4 positioned at the both ends of the pawl shaft 3 may be separately arranged. Otherwise, one linear member 6 made of wire material is inserted through only the flanges 4 positioned at the both ends of the pawl shaft 3 and it may hitch an intermediate portion of the linear member 6 in the outer circumferential sides of the flanges 4 between the intermediate flanges 4.

[0066]
The through holes 5 of all the flanges 4 may be linearly arranged generally in parallel to the pawl shaft 3 and the linear member 6 made of bar member or wire member may be linearly inserted therethrough, or may be arranged in a spiral state around the pawl shaft 3, or the linear member 6 made of wire member may be inserted therethrough in a spiral state along the arrangement of the tilling pawls 2 on the pawl shaft 3.


CLAIMS

1. A rotary tiller comprising:

a plurality of flanges (4) provided in a pawl shaft direction on an outer circumference of a pawl shaft (3) supported so as to be freely rotatable about a shaft axis of a rotary machine frame (10), each flange (4) having a tilling pawl (2) attached thereto, wherein

there is provided a linear member (6) for preventing winding of weeds, extending between the flanges (4) located at both ends of the pawl shaft (3), and

through holes (5) are formed so as to penetrate the flanges (4) located at both ends of the pawl shaft (3) in the pawl shaft direction, the ends of the linear member (6) are inserted through the through holes (5), and stopper means (7) is provided at both of the ends of the linear member (6) for preventing the linear member (6) from slipping off the^through holes (5) in the pawl shaft direction.

2. The rotary tiller according to claim 1, wherein the through holes (5) are formed so as to penetrate
intermediate flanges (4) located between the flanges (4) located at both ends of the pawl shaft (3) in the pawl shaft direction, and the linear member (6) is inserted through the through holes (5) formed in all the flanges (4) .

3. The rotary tiller according to claim 2, wherein the through holes (5) of all the flanges (4) are arranged in a straight line state substantially parallel to the pawl shaft (3).

4. The rotary tiller according to claim 3, wherein the flanges (4) respectively having the tilling pawls (2) attached thereto are fixed to the pawl shaft (3) so that the flanges (4) adjacent to each other in the pawl shaft direction have their tilling pawls (2) with their phases shifted in a circumferential direction, the respective flanges (4) having the through holes (5) formed in positions corresponding to the shifts of all the tilling pawls (2), and the linear member (6) is inserted to pass through all the flanges (4) in a substantially straight line state.

5. The rotary tiller according to claim 2, wherein the through holes (5) of all the flanges (4) are arranged around the pawl shaft (3) in a spiral state.

6. The rotary tiller according to any one of claims 1 to 5, wherein the through hole (5) is a round hole formed in a radially inner side than an attachment base (8) of the tilling pawl (2) .

7. The rotary tiller according to any one of claims 1 to 5, wherein the through hole (5) is formed by forming a notched recess (50) in a radially inward direction from an outer circumference of the flange (4) and closing an opening side of the notched recess (50) with an attachment base (8) of the tilling pawl (2).

8. The rotary tiller according to any one of claims 1 to 7, wherein the stopper means (7) is configured of a male screw (7a) formed at least at one end of the linear member (6) and a nut (7b) screwed with the male screw (7a).

9. The rotary tiller according to any one of claims 1 to 7, wherein the stopper means (7) is formed of a bent portion (7c) formed by bending one end of the linear member (6) or an enlarged portion (7d) formed by radially enlarging at least one end of the linear member (6).

10. The rotary tiller according to any one of claims 1 to 9, wherein a side frame (11) configuring the rotary machine frame (10) has an insertion hole (11a) formed in correspondence with the through hole (5) of the flange (4) so that the linear member (6) is inserted to the insertion hole (11a) from the outward of the side frame (11).

11. The rotary tiller according to any one of claims 1 to 10, wherein each of the flanges (4) is formed of a ring-like disk shaped plate member and each of the flanges (4) is provided with a plurality of leftward bent tilling pawls (2L) and rightward bent tilling pawls (2R) in pairs at intervals in the circumferential direction.