JP4377701B2 - Tillage equipment - Google Patents

Description

  The present invention relates to a center drive type rotary tiller, and more particularly to a technique for preventing a stone or the like from being caught between a tillage claw and a rotary drive case.

  Conventionally, a center drive type rotary tiller mounted on a management machine, tractor, etc. has a rotary drive case arranged vertically in the center of the left and right of the tiller, and projects horizontally on the lower part of the rotary drive case. A tilling claw shaft is horizontally mounted in the direction, a plurality of tilling claws are planted around the tilling claw shaft, and a tilling cover is arranged so as to cover the upper and upper sides of the rotation trajectory of the tilling claw tip. Then, the power from the engine is transmitted to the transmission case to change the speed, and the power is transmitted from the transmission case to the upper part of the rotary drive case to drive the lower tillage claw shaft. A tilling device is configured.

  In the center drive type rotary tiller configured in this way, the rotary drive case is disposed at the center of the left and right, and the rotary drive case has a certain amount of left and right width to accommodate a chain or the like. The plowing in that part was unavoidable. Therefore, to prevent residual tillage from occurring, a technology that is configured to plow the soil in the rotary drive case by providing a residual tillage blade, rod-shaped body, ridge, etc. projecting downward from the front of the rotary drive case. Is known. (For example, refer to Patent Document 1 and Patent Document 2).

Japanese Utility Model Publication No. 2-90903 Japanese Utility Model Publication No. 61-108109

  In such a rotary tillage device, when plowing work with the rotary rotated in the reverse direction, or when there is a reverse rotation part in order to prevent dash, a hard mass such as stone is located in the rotary drive case part. Or when it is repelled by the traveling wheel and reaches the front of the rotary drive case, a stone is caught between the tillage claw and the rotary drive case, and the rotation of the tillage claw shaft is stopped and an excessive load is applied. As a result, the power transmission system may be damaged or worn, and stones may be repelled and hit the rotary drive case, causing damage to the rotary drive case.

  In view of this, the present invention is configured such that a rod-like body is disposed so that stones are repelled during a tilling work and dropped before hitting the rotary drive case, so that a residual tilling process can be performed.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  In Claim 1, the transmission case (11) is arrange | positioned in the front-back center of the management machine (10), a traveling case (18) protrudes below from the front part of this mission case (11), and this traveling case (18) The axle (19) is horizontally mounted in the horizontal direction at the lower part of the vehicle, the traveling wheels (20, 20) are fixed on both sides of the axle (19), and the rear side of the transmission case (11) is rotated obliquely downward to the rear. A drive case (21) is protruded, and a tilling claw shaft (22) projects horizontally on the left and right sides at the bottom of the rotary drive case (21), and a plurality of pieces are mounted on the outer periphery of the tilling claw shaft (22). A tilling claw (23) is planted to constitute a center drive type rotary tilling device (9), and a rod-like body (24) is formed along the rotary driving case (21) at the front of the rotary driving case (21). ) And the rod-like body (24) is viewed from the side. A protrusion (24c) is formed that is bent into an L shape and protrudes, and the front end of the protrusion (24c) protrudes forward from the front upper part of the rotary drive case (21). It is located outside the rotation trajectory (7) at the tip of the tilling claw (23), overlaps with the traveling wheels (20, 20) supported by the axle (19) of the traveling case (18), and the traveling case (18) It extends to the rear side, is arranged close to the rear side, and in the space defined between the traveling case (18) and the rotary drive case (21), between the left and right traveling wheels (20, 20). A protrusion (24c) is extended and arranged in the back part.

According to Claim 2, in the tilling device according to Claim 1, an attachment portion (21a) is formed at a front portion of an edge portion of the rotary drive case (21), and the attachment portion (21a ) of the rotary drive case (21) is formed. ) To fix the mounting portion (24a) of the rod-shaped body (24), and the mounting portion (24a) of the rod-shaped body (24) is formed in a plate shape and is formed in a substantially trapezoidal shape with the lower side widened, The lower part of the rod-like body (24) is attached so as to gradually move away from the lower part of the rotary drive case (21), and the lower end of the rod-like body (24) is lower than the lower end of the rotary drive case (21). And arranged so as to be located above the lower end of the rotation trajectory (7) of the tip of the tilling claw (23), and further arranged to be located in front of the tilling claw shaft (22), It is also used as a residual tillage treatment device.

As effects of the present invention, the following effects can be obtained.
As in claim 1, the transmission case (11) is arranged at the front and rear center of the management machine (10), the traveling case (18) protrudes downward from the front portion of the transmission case (11), and the traveling case (18). The axle (19) is horizontally mounted in the horizontal direction at the lower part of the vehicle, the traveling wheels (20, 20) are fixed on both sides of the axle (19), and the rear side of the transmission case (11) is rotated obliquely downward to the rear. A drive case (21) is protruded, and a tilling claw shaft (22) projects horizontally on the left and right sides at the bottom of the rotary drive case (21), and a plurality of pieces are mounted on the outer periphery of the tilling claw shaft (22). A tilling claw (23) is planted to constitute a center drive type rotary tilling device (9), and a rod-like body (24) is formed along the rotary driving case (21) at the front of the rotary driving case (21). ) And the rod-like body (24) is substantially L in side view. A projecting portion (24c) which is bent and protruded in a shape, and a front end of the projecting portion (24c) projects forward from the front upper part of the rotary drive case (21), and the tilling nail in a side view (23) It is located outside the rotation locus (7) at the tip, overlaps with the traveling wheels (20, 20) supported by the axle (19) of the traveling case (18), and the rear side of the traveling case (18) In the space formed between the traveling case (18) and the rotary drive case (21), the rear part between the left and right traveling wheels (20, 20) Since the projecting portion (24c) is extended and arranged in the tillage, a hard lump of stone or the like is repelled by the rotation of the tillage claws and hits the rod-like body even if it flies to the front side of the rotary. Do not hit the drive case. It can prevent damage of the scan. Also, the front and lower protrusions allow the stones to bounce down downwards and not escape upwards, preventing the stones from biting.

As in claim 2, in the tilling device according to claim 1, an attachment portion (21a) is formed at a front portion of an edge portion of the rotary drive case (21), and the attachment portion (21a ) of the rotary drive case (21) is formed. ) To fix the mounting portion (24a) of the rod-shaped body (24), and the mounting portion (24a) of the rod-shaped body (24) is formed in a plate shape and is formed in a substantially trapezoidal shape with the lower side widened, The lower part of the rod-like body (24) is attached so as to gradually move away from the lower part of the rotary drive case (21), and the lower end of the rod-like body (24) is lower than the lower end of the rotary drive case (21). And arranged so as to be located above the lower end of the rotation trajectory (7) of the tip of the tilling claw (23), and further arranged to be located in front of the tilling claw shaft (22), By combining it with a residual tillage treatment device, The stone, etc., located at the bottom of the re-drive case can be pushed downward, preventing biting, and afterplowing treatment can also be performed. The cost can be reduced by reducing the number of points.

  Next, embodiments of the invention will be described.

  1 is a side view of a management machine equipped with a rod-like body of the present invention, FIG. 2 is a plan view of a rotary tiller, FIG. 3 is a side view, FIG. 4 is a rear view, and FIG. FIG. 6 is a side view of the tillage portion showing a state where the stone hits the rod state, and FIG. 7 is a perspective view showing a conventional structure for mounting the anti-scattering sheet.

  First, the whole structure of the Example which mounted | wore the management machine 10 with the tillage apparatus of this invention using FIG. 1 is demonstrated. Note that the present invention can also be applied to a center drive type rotary tiller that is attached to a towing work vehicle such as a tractor. The management machine 10 has a mission case 11 disposed in the front and rear center, an engine frame 12 protruding forward from a front portion of the mission case 11, and an engine 13 mounted and fixed on the engine frame 12. An output shaft protrudes laterally from the engine 13 so that power can be transmitted to an input shaft protruding laterally from the transmission case 11 via a pulley, a belt, or the like housed in the belt case 16.

  A handle base 14 is provided on the mission case 11, and a lower portion of the handle 15 is disposed on the handle base 14 so as to be pivotable back and forth in a horizontal plane and to be pivotable up and down. Can be changed back and forth, or the height of the handle 15 can be changed according to the height. The handle 15 protrudes obliquely upward and rearward from the handle base 14, and a side clutch lever 17, a main clutch lever, an accelerator lever, and the like are disposed at the rear of the handle 15.

  A traveling case 18 protrudes from the front lower part of the transmission case 11 to the front lower part, and an axle 19 is horizontally mounted in a horizontal direction in the lower part of the traveling case 18, and traveling wheels 20 are fixed to both sides of the axle 19. . Further, a rotary drive case 21 protrudes obliquely downward from the rear lower part of the transmission case 11, and a tilling claw shaft 22 projects horizontally from the left and right sides of the rotary drive case 21. A plurality of tilling claws 23, 23,... Thus, the rotary claw shaft 22 and the tilling claws 23, 23... Constitute a rotary. The rotary is configured to be able to rotate forward or reverse, and can be configured to prevent the dash by turning the rotation direction in the opposite direction on the left and right center sides and outside. A rod-like body 24 for biting prevention and residual plowing according to the present invention, which will be described later, is disposed at the front portion of the rotary drive case 21.

  A beam 25 projects rearward from the rear portion of the mission case 11 in a substantially horizontal direction, and a tillage cover 26 described later is attached to the left and right lower sides of the beam 25. The tillage cover 26 is configured to cover an upper side, an upper side, an upper front side, and an upper rear side of the rotation locus of the rotary.

  A mounting body 27 is provided at the rear end of the beam 25, and a support rod 29 that supports the tail wheel 28 is supported on the mounting body 27 so as to be vertically adjustable, and the support rod 29 is fixed at an arbitrary height by a fixture 30. I can do it. The support rod 29 is slid and fixed, and the height of the tail wheel 28 is adjusted so that the tilling depth can be adjusted.

  In this way, the center drive type rotary tiller 9 is configured at the rear part of the mission case 11, but the rotary tiller can also be configured to be detachable via a hitch at the rear part of the traveling part. That is, in this embodiment, the transmission case 11, the traveling case 18, and the rotary drive case 21 are integrally formed in a reverse “V” or reverse “Y” shape, but the transmission case 11 and the traveling case 18 are integrated. The rotary drive case 21 can also be configured to be separated. In this case, a hitch is provided at the rear part of the mission case 11 and the front part of the beam 25 so that they can be connected, the rotary drive case 21 is fixed to the beam 25, and between the side part of the mission case 11 and the upper part of the rotary drive case 21. A conductive case is arranged on the front so that power can be transmitted.

  A main speed change lever 31 and a PTO speed change lever 32 are arranged on the side surface of the transmission case 11, the travel speed is changed by operating the main speed change lever 31, the forward / backward movement is switched, and the operation of the PTO speed change lever 32 is operated. The rotational speed and direction of the rotary can be changed.

  Next, the tillage cover 26 will be described with reference to FIGS. However, since it is substantially symmetrical, only one side will be described. The tillage cover 26 includes an upper cover 26a, a side cover 26b, a rear cover 26c, and a front cover 26d. In the present configuration example, the upper cover 26a, the rear cover 26c, and the front cover 26d are integrally configured so as to cover the upper part of the rotary in a curved shape, but may be configured separately.

  The upper cover 26a is pivotally supported at the lower side of the beam 25 via front and rear hinges 33 and 33 so as to be vertically rotatable. A link 34 and a fixing member 35 are arranged between the upper cover 26a and the beam 25 so that the upper cover 26a can be fixed at an arbitrary angle. That is, a support stay 36 is fixedly provided on the upper surface of the front, rear, left, and right central portions of the upper cover 26a, and the lower portion of the link 34 is pivotally supported on the support stay 36 by a pin. A long hole 34a is opened. On the other hand, a support rod 37 is erected from the front and rear central portions of the beam 25, and a long hole 37a is opened in the support rod 37 in the vertical direction. Then, screw portions of the fixing member 35 are inserted into the long holes 37a and the long holes 34a so that the left and right links 34 and 34 can be fastened and fixed to the support rod 37.

  Therefore, by loosening the fixing member 35 composed of a knob screw and a nut and lifting the upper cover 26a, the link 34 slides along the long hole 34a and rotates to a desired angle, and then the fixing member 35 It can be fixed by tightening 35. Therefore, the upper cover 26a can swing to an arbitrary angle, and can be set to different angles on the left and right.

  Further, the side cover 26b is formed in a substantially trapezoidal shape, and the front / rear center part of the upper side of the side cover 26b and the front / rear center part of the outer side of the upper cover 26a are rotatably connected by a connecting member 38. . The connecting member 38 includes a fixed plate 38a and a rotating shaft 38b. The rotating shaft 38b is formed by bending a bar in a “U” shape, and both sides of the rotating shaft 38b are fixed to the side cover 26b. Then, the central portion is clamped and fixed to the fixing plate 38a. The fixing plate 38a is attached to both sides of the upper cover 26a and is made of spring steel or the like. In this manner, the side cover 26b can be rotated and opened to the left and right sides, and can be maintained in a state of being rotated at an arbitrary angle.

  And the scattering prevention sheet | seat 39 is attached to the said rear cover 26c integrally comprised by the rear part of the said upper cover 26a, and it prevents so that soil etc. may fly to the operator side at the time of tillage work. As shown in FIG. 7, the conventional anti-scattering sheet is formed of an elastic member such as rubber, and the anti-scattering sheet is configured in a substantially fan shape or a triangular shape so that both ends of the side cover are the rear part and the side part of the rear cover. It was fixed to. Thus, when the side cover is opened, the gap formed between the rear part of the side cover and the side part of the rear cover is closed with the anti-scattering sheet so that dirt or the like is not scattered from the gap. However, when the side cover is rotated to the vertical closed position, the scattering prevention sheet is bent into an “Ω” shape as shown in FIG. 7, and a pipe-like space is created in the center of the scattering prevention sheet. It will end up. When plowing work was performed in this state, the soil formed into a rod shape was pushed out from the central space, and the finish after the work was poor.

  Therefore, in this configuration, as shown in FIGS. 4 and 5, the upper outer side of the anti-scattering sheet 39 is configured to extend to the side from the side end of the rear cover 26c, and is attached to the rear cover 26c. ing. That is, the anti-scattering sheet 39 is formed into a sheet shape by an elastic member such as rubber, and the anti-scattering sheet 39 is configured to be longer outward than the left and right widths of the rear cover 26c at the top, and from the outer side of the rear cover 26c. A projecting portion 39a is formed by extending outward, and the lower portion of the anti-scattering sheet 39 is configured to be longer than the vertical width, and a portion extending downward from the rear cover 26c is a hanging portion 39b. An inner end portion of the overhang portion 39a is fixed to a side end portion of the rear cover 26c, and an upper portion of the hanging portion 39b is fixed to a lower portion of the rear cover 26c. The lower outer edge of the overhanging portion 39a is inclined obliquely inward so as to be continuous with the upper portion of the hanging portion 39b.

  A reinforcing plate 40 is fastened and fixed to the fixing portions of the upper portion of the hanging portion 39b and the lower portion of the rear cover 26c. The reinforcing plate 40 is a thin plate made of a flexible member such as spring steel or synthetic resin, and is configured to have an appropriate width. The inside of the reinforcing plate 40 is cantilevered at the lower part of the rear cover 26c, and the other side is the rear part. Extending outward from the cover 26c, the tip portion is configured to be longer than the protruding portion 39a. And the scattering prevention sheet | seat 39 is pinched | interposed between this reinforcement plate 40 and the rear cover 26c, and it fixes using the volt | bolt etc. In addition, although the inner side of the upper part of the anti-scattering sheet 39 is cut out in an L shape, the entire surface is made of an elastic body without being cut out to prevent mud from adhering to the inner side of the tillage cover 26. You can also.

  In this way, the anti-scattering sheet 39 is arranged so as not to interfere with the rotary, and is fixedly supported with the upper portion of the anti-scattering sheet 39 sandwiched between the reinforcing plate 40 and the rear cover 26c, so that the overhanging portion 39a is folded forward and the rotary. A substantially vertical state is maintained so as not to bend to the side, and when the side cover 26b is in a closed vertical state, the anti-scattering sheet 39 prevents dirt and the like from scattering backward. Further, when the top cover 26a or the side cover 26b is pivoted upward to open the soil to the side, as shown in FIG. The outer end portion is bent and arranged so as to enter the inside of the side cover 26b, so that the soil does not scatter to the rear operator side from between the rear cover 26c and the side cover 26b.

  Further, the inner side of the drooping portion 39b extends to the opposite side of the left and right center of the machine body (rotary tillage device), and is about one third to one half of the lower part of the left and right scattering prevention sheets 39 and 39. Are configured to overlap. With this configuration, when the upper cover 26a is rotated upward to open and work, the anti-scattering sheet 39 is also rotated to the side, but the rear anti-scattering sheet 39 and the anti-scattering sheet 39 There are no gaps between them so that soil does not scatter to the operator.

  Next, a rod-like body 24 that prevents a hard mass such as stone according to the present invention from being caught between the rotary and the rotary drive case 21 will be described with reference to FIGS. 1, 3, and 6. The rod-shaped body 24 is disposed along the longitudinal direction of the rotary drive case 21 at the front portion of the rotary drive case 21. A protruding portion 24 c that protrudes forward and downward is formed on the upper portion of the rod-like body 24. The lower portion of the rod-like body 24 extends downward from the rotary drive case 21. A sprocket, a chain, and the like are housed in the rotary drive case 21, and power from the engine 13 is transmitted to the rotary drive case 21 via the mission case 11. The power transmitted to the rotary drive case 21 rotationally drives the tilling claw shaft 22 to perform tilling by rotation of the tilling claws 23, 23. The rotary drive case 21 is divided into left and right halves, and the edges of the mating surfaces of the left and right cases are fixed to each other by bolts or the like. A mounting portion 21a is formed at the front portion of the edge portion of the mating surface, and the mounting portion 24a of the rod-shaped body 24 is fixed. Note that the attachment portion 24a can be directly fixed to the edge portion of the mating surface without constituting the attachment portion 21a. Further, as long as the rod-shaped body 24 can be disposed at the front portion of the rotary drive case 21, the mounting portion 24 a of the rod-shaped body 24 may be fixed to the side surface of the rotary drive case 21, the lower portion of the transmission case 11, or the like. It doesn't matter.

  And the attachment part 24a of the rod-shaped body 24 is comprised in plate shape, and has opened the long hole 24b long in the longitudinal direction. In this embodiment, the rod-like body 24 is arranged in three longitudinal directions, and the mounting position, that is, the operating position of the rod-like body 24 can be changed by moving the rod-like body 24 parallel to the longitudinal direction of the rotary drive case 21. The attachment portion 24 a is formed in a substantially trapezoidal shape with a wide lower side, and is attached so that the lower portion of the rod-like body 24 is gradually separated from the lower portion of the rotary drive case 21.

  The rod-shaped body 24 is formed of a round bar such as a steel material, but may be a polygonal bar, a pipe member, a plate, or the like. The rod-like body 24 is formed by being bent into a substantially L shape in a side view so that it can be easily formed, and the mounting portion 24a is fixed in parallel to the back surface of the lower rod-like body 24. That is, the rod-shaped body 24 is disposed at the front portion of the rotary drive case 21 and is disposed so as to overlap in the rear view.

  And the lower end of this rod-shaped body 24 is arrange | positioned below the lower end of the rotary drive case 21, is arrange | positioned so that it may be located above the lower end of the rotation locus | trajectory 7 of the tilling nail | claw 23 tip, and also more It arranges so that it may be located in the front. That is, when viewed from the side, the lower end position of the rod-like body 24 is disposed so as to be positioned at the front lower portion inside the rotation trajectory of the tip of the tilling claw 23.

  By configuring in this way, a rod-like body 24 having a diameter shorter than the width of the rotary drive case 21 is positioned at the front part position of the rotary drive case 21 where the tilling claws 23 do not act in the left and right central part of the rotary tiller 9. However, when the rod-like body 24 moves forward, the soil mass can be crushed so that no residual tillage occurs.

  The upper portion of the rod-like body 24 is bent substantially vertically downward and forward to form a protruding portion 24c. However, if the protrusion 24c is configured to protrude forward and downward from the upper part of the rod-like body 24, the protrusion 24c constituted by a stay or the like may be fixed to the upper part of the rod-like body 24 by welding or integrally formed. Is possible.

  The position of the projecting portion 24 c is disposed so as to be located outside the rotation locus 7 at the tip of the tilling claw 23 and in front of the upper portion of the rotary drive case 21 in a side view. The protrusion 24c extends from the front upper part of the rotary drive case 21 to the front lower side, and is bent into an inverted V shape when the rotary drive case 21 is disposed in the vertical direction.

  With this configuration, even when there is a hard mass of stone or the like in front of the rotary drive case 21 during tillage work, the stone hits the rod-like body 24 and escapes to the left and right, for example, the stone or the like will rise upward. However, the stone does not hit the rotary drive case 21, the transmission case 11, or the traveling case 18 because it hits the projecting portion 24 c and is pushed downward, and is not damaged or damaged.

  And the front-end | tip (front end) of the protrusion part 24c is extended to the rear part of the traveling case 18. FIG. That is, the front portion of the protrusion 24 c overlaps with the traveling wheel 20 in a side view, and the front end of the protrusion 24 c is disposed close to the rear side of the traveling case 18. That is, in the side view, the projecting portion 24 c is arranged in the inner portion of the space formed between the traveling case 18 and the rotary drive case 21.

  With this configuration, even if stones or the like are repelled away by the traveling wheels 20 toward the center of the body, they hit the projecting portion 24c and bounce down and fall, and the stones or the like fall into the traveling case 18, the transmission case 11, and the rotary drive case 21. It wo n’t hit you and it wo n’t be damaged. In particular, when the traveling case 18, the transmission case 11, and the rotary drive case 21 are integrally formed as in the present embodiment, the traveling case 18 and the rotary drive case 21 are disposed close to each other, and the traveling case 18 and the rotary drive case 21 are formed in an inverted V shape so that stones or the like can easily enter into the space formed below, but by arranging the rod-like body 24 as in the present invention in the V space. The stone hits the rod-shaped body 24 and hardly hits the traveling case 18, the transmission case 11, or the rotary drive case 21. Further, since the rod-like body 24 has a structure in which a steel bar is bent and the attachment portion 24a is welded and fixed, it can be simply configured and manufactured at low cost, and can be easily attached.

The side view of the management machine which comprised the rod-shaped body of this invention. The top view of a rotary tillage apparatus. Similarly side view. Similarly rear view. The rear perspective view of the state which rotated the side part cover to the upper side. The side view of the tillage part which shows the state where the stone hits the stick state. The perspective view which shows the attachment structure of the conventional scattering prevention sheet | seat.

DESCRIPTION OF SYMBOLS 9 Rotary tillage apparatus 21 Rotary drive case 24 Rod-shaped body 24c Protrusion part 26 Tillage cover 26c Rear cover 39 Scatter prevention sheet

Claims (2)

  A mission case (11) is arranged in the front and rear center of the management machine (10), a traveling case (18) protrudes downward from the front portion of the mission case (11), and an axle (19 ) In the horizontal direction, the traveling wheels (20, 20) are fixed to both sides of the axle (19), and the rotary drive case (21) is obliquely rearwardly lowered from the rear of the transmission case (11). The tilling claw shaft (22) protrudes horizontally on the left and right sides of the rotary drive case (21), and a plurality of tilling claws (23) are provided on the outer periphery of the cultivation claw shaft (22). Planted to constitute a center drive type rotary tiller (9), a rod-like body (24) is arranged along the rotary drive case (21) at the front of the rotary drive case (21), The rod-like body (24) is bent into a substantially L shape when viewed from the side. A protruding projection (24c) is formed, and the front end of the projection (24c) is projected forward from the front upper portion of the rotary drive case (21), and the tip of the tillage claw (23) is seen in a side view. Of the traveling case (18) overlaps with the traveling wheels (20, 20) supported by the axle (19) of the traveling case (18) and extends to the rear side of the traveling case (18). In the space formed between the traveling case (18) and the rotary drive case (21), a protruding portion (in the back part between the left and right traveling wheels (20, 20)) 24c) is extended and arranged. The tilling device according to claim 1, wherein an attachment portion (21a) is formed in a front portion of an edge portion of the rotary drive case (21), and the rod-like body is formed on the attachment portion (21a) of the rotary drive case (21). The mounting portion (24a) of (24) is fixed, and the mounting portion (24a) of the rod-shaped body (24) is formed in a plate shape and is formed in a substantially trapezoidal shape with the lower side widened, and the rod-shaped body (24) bottom, mounted away gradually from the lower portion of the rotary drive case (21), the lower end of the rod-shaped body (24) is located lower than the lower end of the rotary drive case (21) of, and tilling It arrange | positions so that it may be located above the lower end of the rotation locus | trajectory (7) of a nail | claw (23) front-end | tip, Furthermore, it arrange | positions so that it may be located ahead of the said tilling nail | claw axis | shaft (22),
A plowing device that is also used as a residual plowing treatment device.

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