JP6566399B2 - Multi blade mower - Google Patents

Description

The present invention relates to a multi-blade mowing apparatus that cuts grass wrapped around a long object while moving along the long object.

When using a mower to remove weeds that grow near the grounding part of a pole-like structure such as a power pole or its pole, if the rotary blade of the mower touches the pole-like structure, the columnar structure will be brazed and the rotary blade will be damaged. There is a fear. Furthermore, there is a risk of causing an accident in which an operator may be injured by the broken rotary blade fragments scattered by the kickback mower. Therefore, removal of weeds near the ground contact portion of the columnar structure is often performed manually. For this reason, in order to eliminate the inconvenience of mowing work, weed growth prevention plates (for example, refer to Patent Document 1) and pole mats (for example, Patent Document 2) that prevent the growth of weeds near the ground contact portion of the columnar structure. Have been proposed).

JP-A-9-125330 JP 2004-060279 A

Even if weed prevention plates and pole mats can be installed to prevent the growth of weeds near the grounding part of the columnar structure, for example, vines and persimmons grow on the outer periphery of the weed growth prevention plates and pole mats. If so, the columnar structure will eventually wind around the vines and vines. And if it is going to remove the vine and the vine which were wound around the columnar structure, the actual situation is that there is no method other than relying on manual work for the removal work.
Here, since the vines and buds prefer to grow in an environment where the solar radiation is not obstructed, the removal work of the vines and moths will be performed in an environment where the solar radiation is not obstructed. It will be performed under conditions where temperature and humidity are severe. For this reason, reduction of the work burden with respect to an operator has become a big subject. Furthermore, mechanization is demanded for labor saving and efficiency in mowing work that relies on manual work against the background of labor shortage in recent years.

The present invention has been made in view of such circumstances. For example, grass wrapped around a long object such as a utility pole, its support column, or a branch line is mowed without moving the long object while moving along the long object. It is an object of the present invention to provide a multi-blade mowing device capable of performing the above-described operation.

The multi-blade mowing device according to the present invention that meets the above-mentioned object is a multi-blade mowing device that removes grass wrapped around a long object,
1) A pair of left and right blade holders that can rotate around the rotation axis and the long object as a center, and at least the front part of the left and right blade holders, respectively, are rotatable and the left and right Mowing provided with left and right blades provided so as to be able to intersect with a gap when the blade holder is rotated, rotation drive means for the left and right blades, and rotation drive means for the left and right blade holders And
2) A movable holder part that holds the long object and is connected to the mowing part to guide the movement of the mowing part along the longitudinal direction of the long object;
3) It has an operation pole which a tip part connects with the mowing part and guides the mowing part to the destination along the long object.

In the multi-blade mowing apparatus according to the present invention, when the mowing part is guided to the target location along the long object with the operation pole, the mowing part moves while being guided by the movable holder part. The distance between the mowing part and the long object can be kept constant.
Here, the left and right blades provided on the left and right blade holders are rotated, and the left and right blade holders are rotated along the longitudinal direction of the long object while rotating the left and right blade holders with the long object at the center. In other words, the left and right blades in the rotating state can be moved along the longitudinal direction of the long object while repeating the forward and backward movement with respect to the long object, so that the grass wrapped around the long object can be removed. It becomes possible to cut along the longitudinal direction of the long object. As a result, the divided grass cannot be wound around the long object, and can be detached from the long object with the movement of the mowing part and the movable holder part, so that stable mowing work can be performed. become.
The left and right blade holders rotate in opposite phases, that is, the left blade holder rotates clockwise, the right blade holder rotates counterclockwise, the left blade holder rotates counterclockwise, and the right blade holder rotates right. As the left and right blade holders rotate, the center of gravity position of the multi-blade mowing device does not vary greatly. For this reason, the weight balance of the multi-blade mowing device can always be maintained, and the multi-blade mowing device can be moved stably.

It is explanatory drawing which shows the use condition of the multiblade mowing apparatus which concerns on one embodiment of this invention. It is a sectional side view of the multiblade mowing apparatus. It is a plane sectional view of the multiblade mowing apparatus. It is a partial omission front sectional view of the multiblade mowing apparatus. It is a front view which shows the relationship between the rotation state of a left and right blade holder, and a branch line. It is a front view which shows the relationship between the rotation state of a left and right blade holder, and a branch line. It is a front view which shows the relationship between the rotation state of a left and right blade holder, and a branch line with a small outer diameter. It is explanatory drawing when a movable holder part hold | maintains a branch line.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 and 2, a multi-blade mowing apparatus 10 according to an embodiment of the present invention is arranged in an inclined manner between a branch line 11 (an example of a long object) (a side of a power pole 11a and a ground surface 11b). A vine or a vine (an example of grass) wound around the branch line 11, which is arranged at a distance from the branch line 11 and removes the grass wound around the branch line 11, and the branch line 11 and a movable holder 13 that guides the movement of the mowing unit 12 along the longitudinal direction of the branch line 11 by connecting the mowing unit 12 to the mowing unit 12, and a front part that connects the mowing unit 12 to the mowing unit 12. And an operation pole 14 for guiding to a destination location.

As shown in FIG. 2 to FIG. 4, the mowing unit 12 includes a left and right blade holders 15 and 16 and a left and right blade holder that are paired so as to be rotatable about the rotation shaft 23 and the branch line 11 as the center. The left and right blades 17 and 18 are provided at the front portions of 15 and 16 so as to be rotatable and to be able to intersect with a gap when the left and right blade holders 15 and 16 are rotated. 18 rotation drive means 19 and rotation drive means 20 for the left and right blade holders 15 and 16.

As shown in FIG. 2, the rotational drive means 19 is supported by a mowing part frame 21 of the mowing part 12 via a ball bearing 22 which is an example of a bearing member with the axial direction parallel to the longitudinal direction of the branch line 11. The rotating shaft 23 that rotates in this manner, the left rotation transmission mechanism 25 that connects the rotation shaft 23 and the rotation shaft portion 24 of the left blade 17, and the right rotation transmission mechanism that connects the rotation shaft 23 and the rotation shaft portion 26 of the right blade 18. 27. The rotating shaft 23 is a bearing member disposed at the base of the right blade holder 12 with the base of the left blade holder 11 via a ball bearing 28 which is an example of a bearing member disposed at the base of the left blade holder 11. The base part of the right blade holder 12 is penetrated through a ball bearing 28a as an example.

The rotation drive means 20 is arranged in parallel with the rotation shaft 23, and is provided on a rotation support shaft 29 held on the mowing unit frame 21 on both sides and on the outer peripheral side of the rotation support shaft 29. A left rotation transmission mechanism 30 that transmits a rotation driving force to the base, a right rotation transmission mechanism 31 that is provided on the outer peripheral side of the rotation support shaft 29 and transmits the rotation driving force to the base of the right blade holder 16; It has. With such a configuration, the left and right blade holders 15 and 16 can be rotated about the axial center position of the rotation shaft 23.

As shown in FIG. 4, the left and right blade holders 15 and 16 are refracted at the intermediate portion in the longitudinal direction, and the intermediate portion of the left blade holder 15 has a second axial direction parallel to the axial direction of the rotary shaft 23. The left blade 32 is provided with a second right blade 33 whose axial direction is parallel to the axial direction of the rotary shaft 23 in the middle of the right blade holder 16. Further, a central shaft 34 that rotates concentrically with the rotational shaft 23 is provided on the rotational shaft 23 sandwiched between the base portions of the left and right blade holders 15 and 16.

As shown in FIG. 4, the refraction angles of the left blade holder 15 (straight lines passing through the centers of the rotary shaft 23 and the second left blade 32 and straight lines passing through the centers of the second left blade 32 and the left blade 17). ), The refraction angle of the right blade holder 16 (straight lines passing through the centers of the rotating shaft 23 and the second right blade 33, and straight lines passing through the centers of the second right blade 33 and the right blade 18). The angle at which they intersect is greater than 0 degrees and less than 180 degrees, preferably 90 degrees or more and 120 degrees or less. Accordingly, when the rotation shaft 23 is viewed from the axial direction, a straight line passing through the rotation center of the left blade 17 and the rotation center of the second left blade 32, the rotation center of the right blade 18, and the rotation center of the second right blade 33 are obtained. The intersection of the passing straight lines exists on a line connecting the center of the rotation shaft 23 and the center of the rotation support shaft 29 or on an extension line thereof (in FIG. 4, the center of the rotation shaft 23 and the center of the rotation support shaft 29 are connected). The case where the line segment exists on an extended line extending to the rotation support shaft 29 side is described).

As shown in FIG. 2 and FIG. 3, one end side of the rotary shaft 23 protrudes outward from the mowing unit frame 21 and is erected on the outer side of the mowing unit frame 21 via a coupling mechanism 35 having a bevel gear. A first flexible shaft 37 that is connected to one end side of the rotational power shaft 36 and supplies a rotational driving force to the rotational power shaft 36 is connected to the other end side of the rotational power shaft 36. As a result, the rotational driving force is transmitted to the rotational power shaft 36 via the first flexible shaft 37 connected to the rotational shaft of a rotational drive source (for example, an electric motor) (not shown) to rotate the rotational power shaft 36. The rotation of the rotary power shaft 36 can be transmitted to the rotary shaft 23 via the coupling mechanism 35.

The left rotation transmission mechanism 25 that connects the rotation shaft portion 24 of the left blade 17 to the rotation shaft 23 includes a left blade side pulley 38 provided on the rotation shaft portion 24 of the left blade 17 and a rotation shaft of the second left blade 32. A second left blade side pulley 39 provided in the section, a left rotation shaft side pulley 40 attached to the rotation shaft 23, and a belt 41 connecting the left blade side pulley 38 and the second left blade side pulley 39. And a belt 42 for connecting the second left blade side pulley 39 and the left rotating shaft side pulley 40.
As shown in FIG. 4, in the left rotation transmission mechanism 25, the rotation direction of the second left blade 32 and the rotation direction of the left blade 17 are the same with respect to the rotation direction of the rotation shaft 23 (center blade 34). As shown, belts 42 and 41 are wound between the left rotating shaft side pulley 40 and the second left blade side pulley 39 and between the second left blade side pulley 39 and the left blade side pulley 38, respectively. Yes.

A right rotation transmission mechanism 27 that connects the rotation shaft portion 26 of the right blade 18 to the rotation shaft 23 includes a right blade side pulley 43 provided on the rotation shaft portion 26 of the right blade 18 and a rotation shaft of the second right blade 33. A second right blade side pulley 44 provided in the section, a right rotation shaft side pulley 45 attached to the rotation shaft 23, and a belt 46 connecting the right blade side pulley 43 and the second right blade side pulley 44. And a belt 47 that connects the second right blade side pulley 44 and the right rotating shaft side pulley 45.
As shown in FIG. 4, in the right rotation transmission mechanism 27, the rotation directions of the second right blade 33 and the right blade 18 are reversed (opposite directions) with respect to the rotation direction of the rotation shaft 23 (center blade 34). ), The belt 47 is wound so that the right rotation shaft side pulley 45 and the second right blade side pulley 44 rotate in opposite directions, and the second right blade side pulley 44 and the right blade side pulley 43 are Is wound around the belt 46 so as to rotate in the same direction.

As shown in FIG. 2, the rotation driving means 20 transmits a rotation driving force to the base of the left blade holder 15, and transmits a rotation driving force to the base of the right blade holder 16. A right rotation transmission mechanism 31 and a driving force distribution mechanism 48 that distributes the rotation driving force to the left and right rotation transmission mechanisms 30 and 31 are provided. Further, the rotation driving means 20 is connected to a driving force distribution mechanism 48 and a rotation driving source (not shown) (for example, an electric motor), and transmits a second driving force to the driving force distribution mechanism 48. A shaft 49 is provided.

The left rotation transmission mechanism 30 is attached to the outer peripheral side of a ball bearing 28 disposed at the base of the left blade holder 15 and is capable of rotating about the axis of the rotation shaft 23, and a left rotation shaft side outer peripheral gear 50. The rotation support shaft 29 has a left rotation support shaft side outer peripheral gear 52 which is attached to the outer periphery side of the rotation support shaft 29 via a ball bearing 51 and is screwed with the left rotation shaft side outer peripheral gear 50.
The right rotation transmission mechanism 31 is attached to the outer peripheral side of a ball bearing 28 a disposed at the base of the right blade holder 16, and can rotate around the axis of the rotation shaft 23. A right rotation support shaft side outer peripheral gear 54 that is attached to the outer peripheral side of the rotation support shaft 29 via a ball bearing 51 a and is screwed with the right rotation shaft side outer peripheral gear 53 is provided.

The driving force distribution mechanism 48 is attached to the opposite surface side of the left and right rotation support shaft side outer peripheral gears 52 and 54, and rotates with the left and right rotation support shaft side outer peripheral gears 52 and 54, respectively. A driving bevel gear 57 disposed between the gears 55, 56 and the left and right bevel gears 55, 56 and connected to the left and right bevel gears 55, 56 respectively, and one end side connected to the drive bevel gear 57 And a rotation drive shaft 58 provided with a connection portion with the second flexible shaft 49 on the other end side. Further, the driving force distribution mechanism 48 is disposed on the bottom side of the mowing unit frame 21, and the rotation driving shaft 58 passes through the ball bearing 73 (an example of a bearing member) and is rotatably supported. 74.

With this configuration, when the rotation drive force is transmitted from the rotation drive source to the rotation drive shaft 58 via the second flexible shaft 49 and the rotation drive shaft 58 is rotated, the rotation drive shaft 58 rotates. The directions of the rotational driving force transmitted to the left and right bevel gears 55 and 56 via the drive bevel gear 57 connected to the drive shaft 58 are opposite to each other. For this reason, when a rotational driving force is supplied to the bases of the left and right blade holders 15 and 16 via the left and right rotation transmission mechanisms 30 and 31, the left and right blade holders 15 and 16 rotate in opposite phases. As a result, the left and right blade holders 15 and 16 intersect when rotating. The crossing state of the left and right blade holders 15 and 16 can be adjusted by the rotation angle of the rotation drive shaft 58.

When the left and right blade holders 15 and 16 in the state shown in FIG. 5 are rotated and intersected as shown in FIG. 6, the rotation angles of the left and right blade holders 15 and 16 depend on the branch line 11 from the longitudinal direction. As seen, the center position of the closed region R surrounded by the intersecting left and right blade holders 15 and 16 coincides with the center position of the branch line 11 and is inscribed in the closed region R concentrically with the center of the closed region R. the radius of the circle C _I is adjusted to equal to or more than as compared to the radius of the circumscribed circle C _O circumscribing the cross-section of the branch line 11 at the center and concentric branch 11. That is, the rotation angles of the left and right blade holders 15 and 16 are adjusted according to the diameter of the circumscribed circle circumscribing the branch line (radius of the circumscribed circle), and as shown in FIG. As the outer diameter decreases, the rotation angles of the left and right blade holders 15 and 16 increase. Incidentally, in FIG. 6, the radius of an inscribed circle C _I, describes when adjusted to equal the radius of the circumscribed circle C _O.

When the closed region R is formed, gaps δ _C and δ _L are formed between the outer peripheral portions of the central blade 34, the second left blade 32, and the second right blade 33 and the surface of the branch line 11, respectively. , [delta] as _R are formed, the central blade 34, the outer diameter of the second left blade 32, and the second right blade 33 is adjusted. Here, the gaps δ _C , δ _L and δ _R are set to 0.2 to 2 mm, preferably 0.5 to 1 mm.
It should be noted that the outer diameter of the left blade 17 is such that the removal area is wide in a range not in contact with the second left blade 32, and the removal diameter is in a range not in contact with the second right blade 33. Are determined to be wide.

2, 3, and 8, the movable holder portion 13 is disposed on one side in a direction orthogonal to the longitudinal direction of the branch line 11, engages with one side of the branch line 11, rotates, and moves in the longitudinal direction. One side holder frame 62 provided with two moving one side rollers 60 and 61, and arranged on the other side in the direction perpendicular to the longitudinal direction of the branch line 11, engaged with the other side of the branch line 11 and rotated to the longitudinal direction The other side holder frame 65 having two other side rollers 63, 64 moving to the other side holder frame 65 and the one side holder frame 62 are connected, and the one side holder frame 62 is connected to the other side holder frame 65. It includes an electric actuator 66 (an example of an advance / retreat drive source) that moves forward and backward, and has a gripping means 67 that grips and releases the branch line 11 by one side and the other side holder frames 62 and 65.
The roller support shafts 72 of the one side rollers 60 and 61 provided on the one side holder frame 62 are urged toward the other side holder frame 65 by a spring 68 (an example of an elastic member). Thereby, the branch line 11 can be reliably gripped by the one side rollers 60 and 61 and the other side rollers 63 and 64.

As shown in FIG. 1, the operation pole 14 is a multistage type, and the divided poles 69 of various lengths are connected through the connecting members 70 as many as necessary according to the height of the mowing range of the branch line 11. (In FIG. 1, three divided poles 69 of three lengths are connected one by one). As shown in FIG. 2, the tip portion of the operation pole 14 is connected to a connecting portion 75 projecting from the bottom of the mowing portion frame 21.
Each split pole 69 has a hollow shape. As shown in FIG. 2, first and second flexible shafts 37 and 49 and a power cable 71 for the electric actuator 66 are provided in the operation pole 14. Can be stored. As a result, the first and second flexible shafts 37 and 49 and the power cable 71 can be moved together with the operation pole 14, and the operation of the multi-blade mowing apparatus 10 is facilitated, so that the mowing work is efficient. Can be done automatically.

Then, the effect | action of the multiblade mowing apparatus 10 which concerns on one embodiment of this invention is demonstrated.
As shown in FIG. 1, in the multi-blade mowing apparatus 10, when the mowing unit 12 is guided to the target location along the branch line 11 by the operation pole 14, the mowing unit 12 and the movable holder unit 13 are connected. Following the part 12, the movable holder part 13 moves on the branch line 11 toward the destination. For this reason, even if the mowing part 12 moves, the distance between the mowing part 12 and the branch line 11 can be kept constant.

The left blade 17 and the second left blade 32 provided on the left blade holder 15 are rotated, the right blade 18 and the second right blade 33 provided on the right blade holder 16 are rotated, and the left, right blade holder 15, 16 is moved along the longitudinal direction of the branch line 11 while being rotated about the rotation axis 23 and the branch line 11 as the center, the left blade 17, the second left blade 32, and the right blade 18 are rotated. The second right blade 33 moves along the longitudinal direction of the branch line 11 while repeatedly moving back and forth with respect to the branch line 11.
Further, since the rotation angle of the left and right blade holders 15 and 16 can be controlled by adjusting the rotation angle of the rotation drive shaft 58, the central blade 34 and the second blade holder 15 can be adjusted even if the sectional shape of the branch line 11 changes. The gaps δ _C , δ _L , δ _R between the outer peripheral portions of the second left blade 32 and the second right blade 33 and the surface of the branch line 11 are, for example, 0.2 to 2 mm, preferably 0.5. It can be set to ˜1 mm. As a result, the grass stalk wound around the branch line 11 is reliably divided along the longitudinal direction of the branch line 11.
Since the divided grass cannot be wound around the branch line 11, the cut grass is swept out of the branch line 11 when the mowing unit 12 and the movable holder unit 13 are moved.

The left and right blade holders 15 and 16 are rotated in opposite phases, that is, the left blade holder 15 is rotated clockwise, the right blade holder 16 is rotated counterclockwise, and the left blade holder 15 is rotated counterclockwise. Since the right blade holder 16 is simultaneously rotated clockwise, even if the left and right blade holders 15 and 16 are rotated, the position of the center of gravity of the multi-blade mowing apparatus 10 does not vary greatly. For this reason, the weight balance of the multi-blade mowing device 10 can always be maintained, the posture of the multi-blade mowing device 10 can be kept constant and moved on the branch line 11, and stable mowing work can be performed. Become.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
Further, the present invention also includes a combination of components included in the present embodiment and other embodiments and modifications.
For example, the number of the one side roller and the other side roller of the movable holder unit is two, but either one of the one side roller and the other side roller, or the number of both may be three or more. As a result, the gripping force of the gripping means with respect to the branch line can be improved, and the stability when guiding the movement of the mowing unit can be improved.

10: Multi-blade mowing device, 11: Branch line, 11a: Telephone pole, 11b: Ground, 12: Mowing unit, 13: Movable holder unit, 14: Operation pole, 15: Left blade holder, 16: Right blade holder, 17: Left Blade: 18: Right blade, 19: Rotation drive means, 20: Rotation drive means, 21: Mowing frame, 22: Ball bearing, 23: Rotation shaft, 24: Rotation shaft portion, 25: Left rotation transmission mechanism, 26 : Rotation shaft portion, 27: right rotation transmission mechanism, 28, 28a: ball bearing, 29: rotation support shaft, 30: left rotation transmission mechanism, 31: right rotation transmission mechanism, 32: second left blade, 33: second right blade, 34: center blade, 35: coupling mechanism, 36: rotational power shaft, 37: first flexible shaft, 38: left blade side pulley, 39: second left blade side pooh , 40: Left rotation shaft side pulley, 41, 42: Belt, 43: Right blade side pulley, 44: Second right blade side pulley, 45: Right rotation shaft side pulley, 46, 47: Belt, 48: Driving force Distribution mechanism, 49: second flexible shaft, 50: left rotation shaft side outer peripheral gear, 51, 51a: ball bearing, 52: left rotation support shaft side outer peripheral gear, 53: right rotation shaft side outer peripheral gear, 54: right Rotation support shaft side outer peripheral gear, 55: Left bevel gear, 56: Right bevel gear, 57: Drive bevel gear, 58: Rotation drive shaft, 59: Branch line, 60, 61: One side roller, 62: One side Holder frame, 63, 64: other side roller, 65: other side holder frame, 66: electric actuator, 67: gripping means, 68: spring, 69: split pole, 70: connecting member, 71: power cable, 72: roller Support shaft, 73: Bo Le bearings, 74: mount, 75: connecting portion

Claims (8)

A multi-blade mowing device for removing grass wrapped around a long object,
1) A pair of left and right blade holders that can rotate around the rotation axis and the long object as a center, and at least the front part of the left and right blade holders, respectively, are rotatable and the left and right Mowing provided with left and right blades provided so as to be able to intersect with a gap when the blade holder is rotated, rotation drive means for the left and right blades, and rotation drive means for the left and right blade holders And
2) A movable holder part that holds the long object and is connected to the mowing part to guide the movement of the mowing part along the longitudinal direction of the long object;
3) A multi-blade mowing device having an operation pole that is connected to the mowing portion at a tip and guides the mowing portion to a destination along the long object. 2. The multi-blade mowing apparatus according to claim 1, wherein the rotation driving unit is configured such that the rotation shaft rotates in a state where both sides are supported by a mowing unit frame of the mowing unit with an axial direction parallel to a longitudinal direction of the long object. And a left and right rotation transmission mechanism for connecting the rotation shaft and the rotation shaft portions of the left and right blades, respectively, wherein the rotation driving means is arranged in parallel with the rotation shaft, and both sides of the mowing portion And a left and right rotation transmission mechanism that is provided on the rotation support shaft and transmits a rotation driving force to the base of the left and right blade holders. A multi-blade mowing device. 3. The multi-blade mowing apparatus according to claim 2, wherein the movable holder portion is disposed on one side in a direction perpendicular to the longitudinal direction of the long object, and engages with and rotates on one side of the long object to make the longitudinal A one-side holder frame having at least two one-side rollers moving in a direction, and arranged on the other side in a direction perpendicular to the longitudinal direction of the long object, and engaged with and rotated on the other side of the long object. And connecting the other side holder frame and the one side holder frame to the other side holder frame and connecting the other side holder frame to the other side holder frame. A multi-blade mowing apparatus, comprising: an advancing / retreating drive source for advancing and retreating the apparatus, and gripping means for gripping and releasing the long object by the one side and the other side holder frame. 4. The multi-blade mowing device according to claim 3, wherein the left and right blade holders are refracted at a middle portion in the longitudinal direction, and the rotation shaft sandwiched between the base portions of the left and right blade holders includes the rotation shaft and the rotation shaft. A central blade rotating concentrically has a second left blade whose axial direction is parallel to the axial direction of the rotating shaft in the middle part of the left blade holder, and an axial direction in the middle part of the right blade holder. A second right blade parallel to the axial direction of the rotary shaft is provided, and when the rotary shaft is viewed from the axial direction, a straight line passing through the rotational center of the left blade and the rotational center of the second left blade; An intersection of a straight line passing through the rotation center of the right blade and the rotation center of the second right blade exists on a line segment connecting the center of the rotation shaft and the center of the rotation support shaft or an extension thereof. Be Ruchiburedo mowing equipment. 5. The multi-blade mowing apparatus according to claim 4, wherein the center position of the closed region surrounded by the left and right blade holders intersecting with each other when the long object is viewed from the longitudinal direction is equal to the center position of the long object. The inscribed circle radius that is concentric with the center of the closed region and is inscribed in the closed region is equal to or exceeds the circumscribed circle radius that is concentric with the center of the elongated object and circumscribes the cross section of the elongated object. A multi-blade mowing device. 6. The multi-blade mowing device according to claim 5, wherein each rotation angle of the left and right blade holders is adjusted based on the circumscribed circle radius. 7. The multi-blade mowing device according to claim 6, wherein when the closed region is formed, the outer peripheral portions of the central blade, the second left blade, and the second right blade, and the surface of the long object, A multi-blade mowing device characterized in that a gap is formed between them. The multi-blade mowing device according to any one of claims 2 to 7, wherein a first flexible shaft that transmits a rotational driving force to the rotation shaft and the left and right rotation transmission are provided in the operation pole. A multi-blade mowing apparatus characterized in that a second flexible shaft for transmitting a rotational driving force is housed in the mechanism.

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