JP2018170984A - Mower and rotary blade for mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain, by an easy method as much as possible, the cutting performance of vegetation by a rotary blade for mower.SOLUTION: A mower includes a support medium, a rotary blade 20 for mower supported to be rotatably around a rotation axis with respect to the support medium, and a rotation drive part for rotating the rotary blade 20 for mower. The rotary blade 20 for mower includes a discoid rotary blade body 22, and a plurality of cutting blades 30 provided protrusively around the rotary blade body 22. Each of the plurality of cutting blades 30 includes a plurality of division blades 34 aligned along a circumferential direction of the rotary blade body 22, separably with respect to the rotary blade body 22.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a mower.

  2. Description of the Related Art Conventionally, there is a mowing machine that performs mowing by rotating a rotary blade having a plurality of cutting blades protruding around.

  However, when mowing with a rotary blade, the tip of the cutting blade may be damaged, and a situation may occur in which mowing cannot be performed efficiently. In this case, if the cutting blade is polished, the cutting performance with respect to plants and the like can be restored. However, in this case, it is necessary to polish the cutting blades one by one, which is troublesome.

  Then, an object of this invention is to enable it to maintain the cutting performance of the vegetation by the rotary blade for mowing as easy as possible.

  In order to solve the above-described problem, a mower according to a first aspect includes a support, a rotary blade for mowing supported so as to be rotatable about a rotation axis with respect to the support, and the rotary blade for mowing is rotated. A rotary drive unit for cutting, the rotary blade for mowing includes a disk-shaped rotary blade main body, and a plurality of cutting blades provided so as to protrude around the rotary blade main body. Each of the cutting blades includes a plurality of divided blades arranged along the circumferential direction of the rotary blade body in a state separable from the rotary blade body.

  A 2nd aspect is a mower which concerns on a 1st aspect, Comprising: A groove | channel is formed along the boundary of the said rotary blade main body and the said some division blade.

  A 3rd aspect is the mower which concerns on a 1st or 2nd aspect, Comprising: A thin thin part is partially formed in the front end side rather than a base end part among these some division blades. is there.

  A 4th aspect is a mower which concerns on a 3rd aspect, Comprising: The said thin part is formed in the position close | similar to a front-end | tip part rather than a base end part in each of these division blades. .

  A fifth aspect is a mower according to the third or fourth aspect, wherein the rotation is performed on each of the plurality of cutting blades at a position between a base end portion and a tip end portion of the plurality of split blades. A thin portion forming groove extending along the circumferential direction of the blade body is formed, and a portion where the thin portion forming groove is formed is the thin portion.

  A sixth aspect is a mower according to the fifth aspect, wherein the thin-walled portion forming groove is suddenly deeper at a portion closer to the distal end side of the divided blade than at a portion closer to the proximal end side of the divided blade. It is supposed to be a groove.

  A seventh aspect is a mower according to any one of the first to sixth aspects, wherein a slit is formed between adjacent ones of the plurality of divided blades.

  The eighth aspect is a mower according to the seventh aspect, further comprising a filling portion filled in the slit.

  A ninth aspect is a mower according to any one of the first to eighth aspects, wherein a hole is formed in at least a part of the rotary blade body.

  A tenth aspect is a mower according to the ninth aspect, further comprising a cover that is attached to at least one main surface of the rotary blade for mowing and closes the hole.

  An eleventh aspect is a mower according to any one of the first to tenth aspects, wherein the rotary body is provided on one main surface of the mowing rotary blade so as to rotate together with the mowing rotary blade. And a cord rotating member that is supported by the rotating body so that the end portion extends in a direction away from the rotating shaft.

  A twelfth aspect is a mower according to the eleventh aspect, wherein the rotating body includes a rotating body main body supported by the support body together with the rotary blade for mowing, and an end portion extending outward. A first cover member that is detachably attached to the rotating body main body in a state in which the cord-like member is wound, and a second cover member that is detachably attached to the rotating body main body. The first cover member and the second cover member are selectively attached to the rotating main body.

  A thirteenth aspect is a mower according to the eleventh or twelfth aspect, wherein the rotating body includes a winding shaft portion and a flange portion provided on an outer periphery of the winding shaft portion, A cord reel around which the cord-like member is wound is included in a winding shaft portion, and a cord insertion hole is formed in the collar portion along a direction intersecting the thickness direction.

  In order to solve the above problem, a rotary blade for mowing according to a fourteenth aspect includes a disc-shaped rotary blade body and a plurality of cutting blades provided so as to protrude around the rotary blade body, Each of the plurality of cutting blades includes a plurality of divided blades arranged along the circumferential direction of the rotary blade body in a state separable from the rotary blade body.

  A fifteenth aspect is a rotary blade for mowing according to the fourteenth aspect, wherein a groove is formed along a boundary between the rotary blade body and the plurality of divided blades.

  A sixteenth aspect is a rotary blade for mowing according to the fourteenth or fifteenth aspect, wherein a thin thin part is partially formed on the distal end side of the base end part among the plurality of divided blades. Is.

  A seventeenth aspect is a rotary blade for mowing according to the sixteenth aspect, wherein the thin portion is formed at a position closer to the tip than the base end in each of the plurality of divided blades. It is.

  An eighteenth aspect is a rotary blade for mowing according to the sixteenth or seventeenth aspect, in each of the plurality of cutting blades at a position between a base end portion and a tip end portion of the plurality of divided blades. A thin portion forming groove extending along the circumferential direction of the rotary blade body is formed, and a portion where the thin portion forming groove is formed is the thin portion.

  A nineteenth aspect is a rotary blade for mowing according to the eighteenth aspect, wherein the thin portion forming groove is sharper at a portion closer to the distal end side of the divided blade than a portion closer to the proximal end side of the divided blade. It is a deep groove.

  A twentieth aspect is a rotary blade for mowing according to any one of the fourteenth to nineteenth aspects, in which a slit is formed between adjacent ones of the plurality of divided blades.

  A twenty-first aspect is a rotary blade for mowing according to the twentieth aspect, further comprising a filling portion filled in the slit.

  According to the first aspect, in each cutting blade, when the tip of the divided blade on the front side in the rotational direction of the rotary blade for mowing is damaged, the divided blade can be separated from the rotating blade body. Thereby, in each cutting blade, the divided blade on the front side in the rotational direction of the rotary blade for mowing can be sharpened, and the cutting performance of the vegetation by the rotary blade for mowing can be maintained as easily as possible.

  According to the 2nd aspect, each division blade can be easily separated from a rotary blade main body.

  According to the third aspect, the thin-walled portion can be cut easily and reliably so that the vegetation is not shredded by cutting the vegetation like a chainsaw.

  According to the 4th aspect, the vegetation which hit the position near the outer periphery of a division blade can be effectively shredded.

  According to the 5th aspect, the thin part for easily cutting a plant can be easily formed by the thin part formation groove | channel. Moreover, since the front-end | tip part of a division blade becomes comparatively thick, even if the front-end | tip part of a division | segmentation blade hits a hard thing, it is hard to chip.

  According to the sixth aspect, it is possible to effectively shred the vegetation that has hit the portion where the thin portion is formed with respect to the split blade.

  According to the 7th aspect, it is easy to isolate | separate each division blade separately.

  According to the eighth aspect, it is difficult for foreign matter to enter between the divided blades.

  According to the ninth aspect, the weight of the rotary blade for mowing can be reduced by the hole.

  According to the 10th aspect, it becomes difficult for a foreign material to enter into the hole of the rotary blade body.

  According to the eleventh aspect, since the cord-like member rotates together with the mowing rotary blade, a part of the foreign matter is removed by the cord-like member, and is prevented from hitting the mowing rotary blade. Thereby, chipping of the rotary blade for mowing can be effectively suppressed.

  According to the 12th aspect, it can respond easily with the case where a cord-shaped member is used and the case where it is not used.

  According to the thirteenth aspect, if the cord-like member is inserted into the cord insertion hole, the cord-like member is not easily detached from the cord reel. In this state, since the cord-like member can be wound around the cord reel, the winding operation can be easily performed.

  According to the fourteenth aspect, in each cutting blade, when the tip of the split blade on the front side in the rotational direction of the rotary blade for mowing is damaged, the split blade can be separated from the rotary blade body. Thereby, in each cutting blade, the divided blade on the front side in the rotational direction of the rotary blade for mowing can be sharpened, and the cutting performance of the vegetation by the rotary blade for mowing can be maintained as easily as possible.

  According to the fifteenth aspect, each divided blade can be easily separated from the rotary blade body.

  According to the sixteenth aspect, the vegetation can be easily cut by the thin portion.

  According to the 17th aspect, the vegetation which hit the position near the outer periphery of a division blade can be effectively shredded.

  According to the eighteenth aspect, the thin part for easily cutting the plant can be easily formed by the thin part forming groove. Moreover, since the front-end | tip part of a division blade becomes comparatively thick, even if the front-end | tip part of a division | segmentation blade hits a hard thing, it is hard to chip.

  According to the nineteenth aspect, it is possible to effectively shred the vegetation that has hit the portion where the thin portion is formed with respect to the split blade.

  According to the 20th aspect, it is easy to separate each division blade separately.

  According to the twenty-first aspect, it is difficult for foreign matter to enter between the divided blades.

It is a schematic side view of a mower. It is a partial schematic side view of a mower. It is a schematic plan view which shows the rotary blade for mowing and a code | cord | chord rotation part. It is a partial schematic plan view of the rotary blade for mowing. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 4. It is a partial schematic plan view which shows the state which isolate | separated some division blades of the cutting blade. It is a partial schematic plan view which shows the modification which provided the filling part between the division blades. It is a partial schematic plan view which shows the modification which made the edge part of the front side of a division blade into the blade edge | tip structure. It is a schematic plan view which shows the modification of the rotary blade for mowing. It is a schematic plan view which shows the other modification of the rotary blade for mowing. It is a schematic side view of a code | cord | chord rotation part. It is a schematic side view of a code | cord | chord rotation part. It is a disassembled schematic side view of a code | cord | chord rotation part. It is a schematic side view which shows the state which attached the 2nd cover member to the rotary body main-body part. It is a schematic side view which shows a code reel. FIG. 16 is a schematic sectional view taken along line XVI-XVI in FIG. 15. It is explanatory drawing which shows a mode that a plant is cut | disconnected with a blade without a thin part. It is explanatory drawing which shows a mode that a plant is cut | disconnected with a blade without a thin part. It is explanatory drawing which shows a mode that a plant is cut | disconnected with the cutting blade in which the thin part was formed. It is explanatory drawing which shows a mode that a plant is cut | disconnected with the cutting blade in which the thin part was formed.

  Hereinafter, the mower and the rotary blade for mowing according to the embodiment will be described.

<About the overall configuration>
FIG. 1 is a schematic side view showing a mower 10, and FIG. 2 is a partial schematic side view of the mower 10. The mower 10 includes a support 12, a mowing rotary blade 20, and a rotation drive unit 18. In the present embodiment, the mower 10 further includes a cord rotating unit 40. It is not essential that the mower 10 includes the cord rotating unit 40.

  The support 12 is a member that rotatably supports the rotary blade 20 for cutting and the cord rotating part 40, and here, the long pipe-shaped member formed of a metal pipe or the like is formed in a bent shape. Has been. A rotation drive unit 18 such as an engine or an electric motor is attached to an upper end portion which is one end portion of the support 12. A mowing rotary blade 20 and a cord rotating portion 40 are rotatably attached to a lower end portion which is the other end portion of the support body 12. Then, the rotational driving force of the rotational driving unit 18 is transmitted to the rotary blade 20 for cutting and the cord rotating unit 40 through a rotational transmission mechanism such as a flexible shaft and a gear incorporated in the support 12. That is, the rotation driving unit 18 rotates the rotary blade 20 for mowing. In addition, the handle part 14 which an operator holds in order to support the mower 10 in the attitude | position suitable for mowing is provided in the longitudinal direction intermediate part.

  The mowing rotary blade 20 is a disk-shaped member made of metal or the like, and is supported so as to be rotatable around the rotation axis A with respect to the lower end portion of the support 12.

  The cord rotating part 40 is provided on the lower side of the rotary blade 20 for mowing, that is, on the surface opposite to the support 12 with respect to the rotary blade 20 for mowing. The cord rotating unit 40 rotates around the rotation axis A together with the mowing rotary blade 20 by driving of the rotation driving unit 18.

<About rotary blade for mowing>
3 is a schematic plan view showing the rotary blade 20 for mowing and the cord rotating portion 40, FIG. 4 is a partial schematic plan view of the rotary blade 20 for mowing, and FIG. 5 is a schematic cross-sectional view taken along the line VV of FIG. FIG.

  The mowing rotary blade 20 is a member integrally formed of metal or the like, and includes a rotary blade body 22 and a plurality of cutting blades 30.

  The rotary blade body 22 is formed in a disk shape. A cylindrical portion 23 is erected at the center of the rotary blade body 22, and a fixing hole 23 h is formed in the cylindrical portion 23. Then, in a state where the cylindrical portion 23 is externally fitted to the lower end portion of the support body 12, a rotating shaft extending from the lower end portion of the support body 12 is inserted into the fixing hole 23h. In this state, a nut is fastened to the rotary shaft protruding from the rotary blade main body 22, so that the rotary blade 20 for mowing is fixed to rotate together with the rotary shaft.

  The rotary blade body 22 has a hole 22h. Here, a plurality of (here, three) holes 22h are formed in a portion of the rotary blade body 22 around the cylindrical portion 23. Each hole 22h is preferably as large as possible within a range in which the strength of the rotary blade body 22 can be maintained. Here, each hole 22h is formed in a hole shape having a portion whose width gradually decreases from the outer periphery of the rotary blade body 22 toward the inner periphery. The plurality of holes 22h are formed so as to exhibit rotational symmetry about the rotation axis A. By forming the hole 22h in the rotary blade main body 22, the rotary blade main body 22 can be reduced in weight.

  The plurality of cutting blades 30 are provided so as to protrude around the rotary blade body 22. The plurality of cutting blades 30 exhibit rotational symmetry about the rotation axis A. That is, when N (N is an integer of 2 or more), when N cutting blades 30 are provided, the N cutting blades 30 exhibit N-fold rotational symmetry about the rotation axis A.

  Here, when the plurality of cutting blades 30 are viewed as a whole, they are provided around the rotary blade body 22. In other words, when N cutting blades 30 are provided, each cutting blade 30 exists in a portion that draws an arc having a central angle (360 / N) degrees around the rotation axis A around the rotary blade body 22. Yes. But the part in which the cutting blade 30 is not provided between each cutting blade 30 may exist.

  Here, eight cutting blades 30 are provided. Each of the cutting blades 30 has eight-fold rotational symmetry about the rotation axis A. Further, each cutting blade 30 is present in a portion that draws an arc having a central angle of 45 degrees around the rotation axis A around the rotary blade body 22.

  The cutting blade 30 includes a plurality (here, 11) of divided blades 34. The plurality of divided blades 34 are formed so as to be aligned along the extending direction of the cutting blade 30, that is, the circumferential direction of the rotary blade body 22. Each divided blade 34 is formed to be separable from the rotary blade body 22. The fact that the split blade 34 is separable from the rotary blade body 22 means that the split blade 34 can be separated without performing a cutting process or the like normally performed to cut metal or the like.

  Here, the groove 24 is formed along the boundary between the rotary blade body 22 and the plurality of divided blades 34. At the boundary between the rotary blade body 22 and the plurality of divided blades 34, the depth of the groove 24 is thinner than the other portions. For this reason, when a force to bend in the thickness direction is applied to any of the divided blades 34 (see FIG. 5), the divided blades 34 are broken and separated at the portions where the grooves 24 are formed (see FIG. 6). Separation of the divided blades 34 may be performed by a dedicated tool that applies the above-described breaking force to the divided blades 34 according to the principle of the lever, or may be performed by a general-purpose tool such as pliers. The grooves 24 are preferably formed on both surfaces of the rotary blade 20 for mowing. Thereby, it is possible to cause metal fatigue by repeatedly bending the split blade 34 to both sides, and the split blade 34 can be easily separated. But the groove | channel 24 may be formed only in one side of the rotary blade 20 for mowing.

  The groove 24 may have a transverse cross section (cross section orthogonal to the extending direction) V-shape or arc shape. Here, the groove 24 has a circular arc shape in cross section. If the groove 24 has a cross-sectional arc shape, a region where the thickness can be reduced can be increased to some extent at the base end portion of the cutting blade 30, and the cutting of the vegetation can be performed at this portion. Will improve.

  Moreover, the some division | segmentation blade 34 is the state which was isolate | separated between the things adjacent, or the state which can be isolate | separated. Here, the slits 26 are formed between adjacent ones of the plurality of divided blades 34, and are separated from the beginning. However, a groove having a V-shaped cross section or an arc shape is formed between adjacent ones of the plurality of divided blades 34, and the plurality of divided blades 34 are separable between adjacent ones. It may be connected.

  Here, the slit 26 is a gap that does not exist other than air. However, as shown in FIG. 7, the filling portion 26 a may be filled in the slit. The filling portion 26a can be formed by melting and filling a thermoplastic resin, filling an adhesive, or the like. By providing the filling portion 26 a in the slit 26, it becomes difficult for a cord-like member 60 described later to enter the slit 26. Moreover, it becomes difficult to separate each divided blade 34 carelessly. Since the filling portion 26a is weaker than the metal constituting the rotary blade 20 for mowing, even if the filling portion 26a remains after the split blade 34 is separated, it can be easily removed. The filling part 26a may be a transparent resin.

  3 to 6, the split blade 34 is a quadrangular plate shape surrounded by the outer peripheral edge portion 34 a, the one side edge portion 34 b, and the other side edge portion 34 c, here, a parallelogram plate shape. Is shown.

  The outer peripheral edge 34a is formed in an arc shape. Assuming that the direction of rotation of the rotary blade 20 for mowing is R, the arc formed by the outer peripheral edge 34a is directed to the opposite side of the rotation direction R with respect to the arc C centering on the rotation axis A. As shown in FIG. 4, a partial spiral approaching the rotation axis A is drawn (see FIG. 4). The plurality of divided blades 34 are also arranged along the partial spiral. For this reason, when observing the plurality of divided blades 34 as a whole, it approaches the rotation axis A side as it goes to the opposite side to the rotation direction R. When observing between the adjacent cutting blades 30, the outer peripheral edge 34 a of the dividing blade 34 on the rear side in the rotation direction R is located at the base end portion of the dividing blade 34 on the front side in the rotation direction R. Thereby, the split blade 34 on the front side in the rotational direction R can be projected to the outer peripheral side in each cutting blade 30 while the outer peripheral edge portion of each cutting blade 30 is smoothly continued in an arc shape.

  Further, the front edge portion 34b in the rotation direction R of the split blades 34 is inclined so as to face the rear side in the rotation direction R with respect to the diameter B direction of the circle centering on the rotation axis A (FIG. 3). And FIG. 4). For this reason, when the rotary blade 20 for cutting the grass is rotated, if the vegetation hits the edge 34b, it is moved toward the center of the rotary blade 20 for cutting according to the inclination of the edge 34b, and toward the base end. It is cut in the middle or cut or shredded by hitting the corner of the base end.

  Moreover, the edge part 34c of the rear side of the rotation direction R among the division blades 34 is also inclined similarly to the edge part 34b. For this reason, between the adjacent divided blades 34, the edge portion 34b of one divided blade 34 and the edge portion 34c of the other divided blade 34 extend in parallel, and a slit having an equal width between them. 26 is formed. But it is not essential that the edge part 34c inclines as mentioned above.

  The edge portions 34a, 34b, 34c of the divided blade 34 have a shape in which each corner portion of the divided blade 34 formed in a plate shape remains. Each corner portion can form a cutting edge whose cutting edge angle is a right angle. However, as shown in FIG. 8, for example, the edge 34 b on the front side in the rotation direction R of the divided blade 34 may be formed in a blade edge structure that gradually becomes thinner toward the front side in the rotation direction R.

  A thin portion 35 that is partially thin is formed on the tip side of each split blade 34 with respect to the base end portion. Here, each of the cutting blades 30 has a thin portion forming groove 35g extending along the circumferential direction of the rotary blade body 22 at a position between the edge portion 34a and the base end portion on the distal end side of the plurality of divided blades 34. Is formed. The thin portion 35 and the thin portion forming groove 35g are formed at a position closer to the distal end portion than the proximal end portion of the split blade 34. Further, the thin portion forming groove 35g is formed in a groove shape that suddenly becomes deeper at a portion closer to the distal end side of the divided blade 34 than a portion closer to the proximal end side of the divided blade 34. More specifically, a portion of the thin portion forming groove 35g close to the distal end side of the split blade 34 is formed in a shape that suddenly becomes deep while drawing an arc, and the thin portion forming groove 35g is close to the proximal end side of the split blade. This part is formed in a shape that gently deepens while drawing a gentle arc or straight line. The thin part forming groove may have a triangular groove shape, a semicircular groove shape, or the like. A portion of each divided blade 34 where the thin portion forming groove 35 g is formed is a thin portion 35.

  Since the portion where the thin portion 35 is formed in the divided blade 34 is thinner than the other portions, if the plant hits the portion where the thin portion 35 is formed among the edges 34b of the divided blade 34, the plant is easy. Disconnected. Further, when the vegetation hits the front end side in the rotational direction of the split blade 34, the vegetation enters the thin portion 35 while being bent. As a result, the vegetation is shredded without escaping to the outer peripheral side of the split blade 34. In particular, the thin portion forming groove 35g is formed in a groove shape that suddenly becomes deeper at a portion closer to the distal end side of the dividing blade 34 than a portion closer to the proximal end side of the dividing blade 34, so that the vegetation is formed into a thin portion forming groove. It gets into 35g and is effectively shredded. This point will be further described later. Further, since the tip side portion of the edge portion 34b of the split blade 34 is thicker than the portion where the thin portion 35 is formed, it is assumed that a hard object such as a stone hits the tip side portion of the edge portion 34b. However, the portion on the tip side of the edge portion 34b is not easily chipped.

  Further, a cover 25 for closing the hole 22h is provided on at least one main surface of the rotary blade 20 for mowing. The cover 25 is a disk-shaped member made of a resin such as a transparent resin. Here, the cover 25 is provided on the lower surface of the mowing rotary blade 20, that is, the surface on the side where the cord rotating portion 40 is provided. The cover 25 is provided on the lower surface of the mowing rotary blade 20 and suppresses foreign matter (for example, the cord-like member 60) from entering the hole 22h.

  The cover 25 is provided between the mowing rotary blade 20 and the cord rotating portion 40, and is preferably in close contact with the mowing rotary blade 20 and the cord rotating portion 40 as much as possible. Thereby, the cord-like member 60 is prevented from entering between the rotary blade 20 for mowing and the cover 25 and between the cord rotating portion 40 and the cover 25. Here, the cover 25 is bonded to the surface of the cord rotating portion 40 on the mowing rotary blade 20 side with an adhesive or the like.

  The cover 25 may be provided on the upper surface side of the rotary blade 20 for mowing.

  In the above example, the rotary blade 20 for mowing has been described as an example including the eight cutting blades 30 around the rotary blade main body 22, but the number of the cutting blades 30 may be plural, and the number is arbitrary.

  For example, the rotary blade 120 for mowing shown in FIG. 9 includes two cutting blades 130 around the rotary blade main body 122.

  10 includes four cutting blades 230 around the rotary blade body 222. The rotary blade 220 for mowing shown in FIG.

  In addition, an example in which three cutting blades are provided around the rotary blade main body, an example in which five to seven blades are provided, an example in which nine to twelve blades are provided, and an example in which many cutting blades are provided are conceivable.

  In addition, here, each divided blade 34 has been described as a portion obtained by processing a plate material into a predetermined shape, but a hard tip such as a hard alloy or diamond is provided at the front end of the divided blade in the rotation direction. Also good.

<About the code rotating section>
11 and 12 are schematic side views of the cord rotating unit 40, and FIG. 13 is an exploded schematic side view of the cord rotating unit 40.

  The cord rotating unit 40 includes a rotating body 42 and a cord-like member 60.

  The cord rotation unit 40 is provided on one main surface (here, the lower surface) of the mowing rotary blade 20 so as to rotate together with the mowing rotary blade 20. The cord-like member 60 is supported by the rotating body 42 so that the end portion extends in a direction away from the rotation axis A. And when the code | cord | chord rotating part 40 rotates with the rotary blade 20 for mowing, the cord-shaped member 60 will also rotate. When mowing, the cord-like member 60 rotates below the rotary blade 20 for mowing so that the cord-like member 60 contacts the plant before the rotary blade 20 for mowing contacts the plant. When small foreign matters such as pebbles are present in the vegetation, the cord-like member 60 contacts a part before the rotary blade 20 for mowing contacts the foreign matter, and the foreign matter can be removed. Thereby, it is suppressed that a small foreign material contacts the rotary blade 20 for mowing, and chipping of the cutting blade 30 due to a small and hard foreign material is suppressed.

  The length dimension of the cord-like member 60 extending from the rotating body 42 is preferably large enough to extend (slightly extend) the tip portion thereof to the outside of the rotary blade 20 for mowing.

  The cord-like member 60 is preferably a resin cord having a diameter of 2.5 mm to 3 mm and a circular cross section. Thereby, it becomes difficult to wind the cord-shaped member 60 around the rotating body 42 or the like.

  More specifically, the rotating body 42 includes a rotating body main body 44 and a first cover member 50.

  The rotating body main body 44 is supported on the support body 12 together with the mowing rotary blade 20. For example, a nut is fastened to the rotating shaft protruding into the rotating body main body 44 with the rotating shaft extending from the lower end of the support 12 inserted through the rotary blade 20 for mowing and the rotating body main body 44. As a result, the mowing rotary blade 20 and the rotary body main body 44 are fixed to the rotary shaft in a non-rotating state.

  The rotating body main body 44 includes a ceiling portion 45, a peripheral wall portion 46, and a locking piece 47.

  The ceiling part 45 is formed in a disc shape, and the cover 25 is fixed to the upper outer surface thereof. The ceiling part 45 is fixed to the support 12 so as to contact the lower surface of the rotary blade 20 for mowing through the cover 25.

  The peripheral wall portion 46 projects from the periphery of the lower surface of the ceiling portion 45 and surrounds the lower space of the ceiling portion 45. Concave portions 46a are formed in two opposing portions of the peripheral wall portion 46, and locking pieces 47 are formed in the concave portions. The locking piece 47 protrudes downward from the facing portion of the periphery of the lower surface of the ceiling portion 45. A locking projection 47 p that protrudes outward is formed at the tip of the locking piece 47. The locking projection 47 p is formed in a plate shape that can be elastically deformed in the inner and outer directions of the peripheral wall 46. The front end portion of the locking piece 47 in the locking projection 47p is formed on a guide surface 47a whose projecting dimension gradually decreases toward the front end side of the locking piece 47. A portion of the locking projection 47 p that faces the proximal end side of the locking piece 47 is formed on a locking surface 47 b that is orthogonal to the protruding direction of the locking piece 47.

  Moreover, the code | cord | leading recessed part 46b is formed in two places which shifted | deviated 90 degree | times to the surroundings of the rotating shaft A with respect to the said recessed part 46a among the surrounding wall parts 46. FIG.

  The first cover member 50 is detachably attached to the rotating body main body 44 in a state where the cord-like member 60 is wound so that the end portion extends outward.

  More specifically, the first cover member 50 includes a bottom portion 52 and a peripheral wall portion 54.

  The bottom 52 is formed in a disc shape. An opening 51 h is formed at the center of the bottom 52. In addition, a locking hole 53 is formed at a position of the bottom 52 that faces the pair of locking pieces 47. The locking hole 53 is formed in an elongated slit shape into which the distal end portion of the locking piece 47 can be inserted. A receiving portion 53a is formed in the outer portion of the locking hole 53 so that the locking projection 47p can be pulled out and locked.

  The peripheral wall portion 54 protrudes from the periphery of the upper surface of the bottom portion 52 and surrounds the upper space of the bottom portion 52. The peripheral wall portion 54 is formed in a size that can be fitted onto the peripheral wall portion 46. A concave portion 54 a is formed in a portion corresponding to the pair of locking pieces 47 in the peripheral wall portion 54. With the first cover member 50 attached to the rotating body main body 44, the pair of locking pieces 47 is formed. It arrange | positions in the said recessed part 54a. A cord lead-out recess 54b is formed at a position corresponding to the cord lead-out recess 46b in the peripheral wall portion 54, and a cord lead-out member 56 is disposed in the cord lead-out recess 54b. The cord lead-out member 56 is a member in which a cord insertion hole 56h through which the cord-like member 60 can be inserted is formed, and a slit 56a for arranging the cord-like member 60 in the cord insertion hole 56h from the outside is formed. .

  The first cover member 50 is attached to the rotating body main body 44 in a state where the peripheral wall portion 54 surrounds the outer periphery of the peripheral wall portion 46. In this state, the tip ends of the pair of locking pieces 47 are inserted into the locking holes 53. When the distal end of the locking piece 47 is inserted into the locking hole 53, the guide surface 47a hits the opening edge of the locking hole 53 and the locking piece 47 is elastically deformed inward, When the convex portion 47p exceeds the receiving portion 53a, the locking piece 47 returns to its original shape, and the locking convex portion 47p is retained and locked to the receiving portion 53a. Thereby, the first cover member 50 is attached to the rotating body main body 44. In this state, the cord lead-out member 56 is also disposed in the cord lead-out recess 46b.

  In the above state, when the pair of locking pieces 47 are elastically deformed inward to release the locking state between the locking projection 47p and the receiving portion 53a, the first cover member 50 is removed from the rotating body main body 44. be able to.

  The rotating body 42 accommodates a cord reel 70 around which the cord-like member 60 is wound.

  The cord reel 70 includes a winding shaft portion 72 and flange portions 74, 75, and 76.

  The winding shaft portion 72 is formed in a cylindrical shape, and the cord-shaped member 60 is wound around the winding shaft portion 72.

  The flange portions 74, 75, and 76 are members formed so as to protrude from the outer periphery of the winding shaft portion 72, and have a disc outer shape. The collar portion 74 is provided at one end of the winding shaft portion 72, the collar portion 75 is provided at the other end portion of the winding shaft portion 72, and the flange portion 76 is provided at an intermediate portion in the axial direction of the winding shaft portion 72. ing.

  A half region on one end side of the cord-like member 60 is wound around the winding shaft portion 72 between the flange portions 74 and 76, and a half region on the other end side of the cord-like member 60 is between the flange portions 75 and 76. Is wound around the winding shaft portion 72.

  An operation portion 77 that protrudes outward is provided on one end side of the winding shaft portion 72. An urging member 78 such as a coil spring is provided on the other end side of the winding shaft portion 72.

  A plurality of rotation stop recesses 79 are formed around the portion of the cord reel 70 from which the operation portion 77 protrudes. Correspondingly, an anti-rotation convex portion 59 is formed around the opening 51 h on the inner surface side of the bottom portion 52 of the first cover member 50. The concavo-convex relationship between the rotation stop recess 79 and the rotation stop protrusion 59 may be reversed.

  The cord reel 70 is accommodated in the first cover member 50 in a state where the cord-like member 60 is wound around the cord reel 70. In this state, both end portions of the cord-like member 60 extending from the cord reel 70 are drawn outward through the cord insertion hole 56 h of the cord lead-out member 56.

  When the first cover member 50 is attached to the rotating body main body 44 in a state where the cord reel 70 is housed in the first cover member 50, the operation portion 77 protrudes outward from the opening 51h. Further, the urging member 78 is interposed between the cord reel 70 and the ceiling portion 45 in a compressed state, whereby the cord reel 70 is urged toward the first cover member 50 side. In this state, the rotation preventing projection 59 is fitted into the rotation stopping recess 79, and the rotation of the cord reel 70 is restricted. For this reason, the length dimension of the cord-like member 60 extending from the rotating body 42 is kept constant. When the length of the cord-like member 60 extending from the rotating body 42 is shortened due to wear of the cord-like member 60 or the like, the operation unit 77 is pushed. Then, the rotation prevention convex part 59 is pulled out from the rotation prevention concave part 79, and the cord reel 70 becomes rotatable in the rotary body main body 44 and the first cover member 50, and each end of the cord-like member 60 is removed. Can be pulled out. When the force that pushes the operation portion 77 is released in a state where each end portion of the cord-like member 60 is pulled out by a desired length, the rotation prevention convex portion 59 fits into the rotation prevention concave portion 79 and the cord reel 70 The rotation is restricted, and the state returns to the above state in which the length of the cord-like member 60 is kept constant.

  As shown in FIG. 14, a second cover member 150 can be detachably attached to the rotating body main body 44 in place of the first cover member 50. The second cover member 150 is also shown in parentheses in FIG.

  The second cover member 150 includes a bottom portion 152 and a peripheral wall portion 154.

  The bottom portion 152 has the same structure as the bottom portion 52 except that the opening 51h and the locking projection 47p are not formed.

  The peripheral wall portion 154 has the same structure as the peripheral wall portion 54 except that the cord lead-out recess 54b is not formed.

  The second cover member 150 is attached to the rotating body main body 44 when the cord-shaped member 60 is not used and the mowing rotary blade 20 is used exclusively for mowing. That is, the first cover member 50 and the second cover member 150 are selectively detachably attached to the rotating body main body 44.

  Further, when the cord-like member 60 is wound around the cord reel 70, the middle portion in the longitudinal direction of the cord-like member 60 is arranged from between the flange portions 74, 76 to between the flange portions 75, 76. In this state, it is preferable that the cord reel 70 is temporarily fixed.

  Therefore, as shown in FIGS. 15 and 16, a cord insertion hole 76h is formed in the flange portion 76 along a direction intersecting the thickness direction thereof. The cord insertion hole 76h extends in a direction intersecting the thickness direction between the outer peripheral edge portion and the inner peripheral edge portion of the flange portion 76 along the direction orthogonal to the radial direction. One opening of the cord insertion hole 76h opens to the flange portion 74 side, and the other opening opens to the flange portion 75 side. Then, the cord-like member 60 is inserted from one opening of the cord insertion hole 76h toward the other opening, and an intermediate portion in the extending direction of the cord-like member 60 is disposed in the cord insertion hole 76h. At this time, since the cord insertion hole 76h is along the direction intersecting the thickness direction of the flange portion 76, the operation of inserting the cord-like member 60 into the cord insertion hole 76h can be easily performed. Then, with the intermediate portion in the extending direction of the cord-like member 60 disposed in the cord insertion hole 76h, one end thereof is wound around the winding shaft portion 72 between the flange portions 74 and 76, and the other The end portion on the side can be wound around the winding shaft portion 72 between the flange portions 75 and 76. At this time, since the intermediate portion in the extending direction of the cord-like member 60 is inserted into the cord insertion hole 76h, the cord-like member 60 is difficult to come off from the flange portion 76. Here, the cord insertion hole 76h is also formed on the opposite side across the winding shaft portion 72. When the cord-like member 60 is wound, the winding operation may be performed using any one of the cord insertion holes 76h.

  According to the mower 10 or the rotary blade 20 for mowing configured as described above, if the tip of the split blade 34 on the front side in the rotation direction R of the rotary blade 20 for mowing is damaged in each cutting blade 30, the split blade 34 is concerned. Can be separated from the rotary blade body 22. Then, in each cutting blade 30, the next divided blade 34 is positioned on the front side in the rotational direction R. Thereby, in each cutting blade 30, the division | segmentation blade of the front side of the rotation direction R of the rotary blade 20 for mowing can be sharpened, and the cutting performance of the grass by the rotary blade 20 for mowing can be maintained as easily as possible.

  Further, since the groove 24 is formed on the base end side of the divided blade 34, each divided blade 34 can be easily separated from the rotary blade main body 22.

  Further, since the thin blade 35 is formed on the split blade 34, the thin blade 35 can be easily and reliably cut by cutting the vegetation like a chain saw.

  This will be described in more detail in comparison with the case where the thin portion 35 is not formed. That is, as shown in FIGS. 17 and 18, a blade 300 in which the thin portion 35 is not formed is assumed. When the blade 300 rotates and hits the vegetation 320 existing on the front side in the rotation direction, the vegetation 320 may escape to the outer peripheral side of the blade 300. For this reason, even if vegetation hits the blade 300, it may remain uncut. In order to avoid the above, it is necessary to make the rotational speed of the rotary blades exceed 10 million revolutions per minute, resulting in poor fuel consumption.

  On the other hand, when the thin portion 35 is formed on the split blade 34, the split blade 34 rotates as shown in FIGS. 19 and 20, and the vegetation 320 existing on the front side in the rotation direction is the thin portion 35 of the split blade 34. If it hits the part where is formed, the vegetation 320 bends at the part where the split blade 34 hits due to the impact. Then, the bent part of the plant 320 enters the groove (thin wall portion forming groove 35 g) that forms the thin wall portion 35. When the split blade 34 further rotates, the portion of the plant 320 that has entered the groove forming the thin portion 35 (thin portion forming groove 35g) is shredded by the thin portion 35 without escaping to the outer peripheral side. This makes it possible to cut the vegetation while suppressing uncut portions even if the rotational speed of the rotary blade for mowing 20 is reduced. For example, the rotational speed of the rotary blade for mowing 20 can be reduced to 5000 rpm or less. It becomes possible.

  Moreover, a thin portion forming groove 35g extending along the circumferential direction of the rotary blade body 22 is formed in each of the plurality of cutting blades 30 at a position between the base end portion and the tip end portion of the plurality of divided blades 34. Since the portion where the thin portion forming groove 35g is formed is the thin portion 35, the thin portion 35 can be easily formed with respect to the plurality of divided blades 34. Moreover, since the front-end | tip part of the division | segmentation blade 34 becomes comparatively thick, even if the outer edge of the front-end | tip part of the division | segmentation blade 34 hits a hard thing, it is hard to chip.

  Further, since the thin portion 35 is formed at a position closer to the distal end portion than the base end portion in each of the plurality of divided blades 34, the thin portion 35 is also formed at a position where the plant is closer to the distal end side of the divided blade 34. Is more effectively cut off.

  Further, since the thin portion forming groove 35g is a groove that suddenly becomes deeper at the portion closer to the distal end side of the divided blade than the portion closer to the proximal end side of the divided blade 34, the portion of the plant 320 is the thin portion formed groove. If it enters 35g, it will become difficult to escape from the thin part formation groove | channel 35g to an outer peripheral side. For this reason, it is possible to more effectively shred vegetation that hits the portion where the thin portion 35 is formed with respect to the divided blade 34.

  Further, since the slits 26 are formed between the divided blades 34, it is easy to separate each divided blade 34 individually.

  Further, when the slit 26 is filled with the filling portion 26 a, it is difficult for foreign matter such as the cord-like member 60 to enter between the divided blades 34.

  Further, since the hole 22h is formed in the mowing rotary blade 20, the weight of the mowing rotary blade 20 can be reduced.

  In this case, if the cover 25 that closes the hole 22h is provided, it is difficult for foreign matter such as the cord-like member 60 to enter the hole 22h.

  Further, the cord-like member 60 held by the rotating body 42 is rotated together with the rotary blade 20 for mowing. For this reason, mowing with the rotary blade 20 for mowing can be performed while removing foreign matters such as pebbles with the cord-like member 60. Thereby, it is suppressed that foreign matters, such as pebbles, hit the rotary blade 20 for mowing, and damage, chipping, etc. of the rotary blade 20 for mowing can be effectively suppressed.

  Further, the first cover member 50 that holds the cord-like member 60 and the second cover member 150 that does not hold the cord-like member 60 can be selectively attached to the rotating body main body 44. For this reason, it is possible to easily cope with the case where mowing is performed using the cord-like member 60 and the case where mowing is performed without using the cord-like member 60.

  Further, since the cord insertion hole 76h intersecting the thickness direction is formed in the flange portion 76 of the cord reel 70, if the cord-like member 60 is inserted into the cord insertion hole 76h, the cord-like member 60 is corded. Hard to come off the reel 70. In this state, since the cord-like member 60 can be wound around the cord reel 70, the winding operation can be easily performed.

  In addition, each structure demonstrated in the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Mower 12 Support body 18 Rotary drive part 20, 120, 220 Rotary blade for mowing 22 Rotary blade main body 22h Hole 24 Groove 25 Cover 26 Slit 26a Filling part 30, 130, 230 Cutting blade 34 Split blade 35 Thin part 35g Thin part Forming groove 40 Cord rotating portion 42 Rotating body 44 Rotating body main body portion 46b Cord lead-out recessed portion 47 Locking piece 50 First cover member 53 Locking hole portion 56 Cord lead-out member 60 Cord-like member 70 Code reel 72 Winding shaft portion 74 鍔Part 75 collar part 76 collar part 76h cord insertion hole 150 second cover member A rotating shaft

Claims (21)

A support;
A rotary blade for mowing supported so as to be rotatable about a rotation axis with respect to the support;
A rotation drive unit for rotating the rotary blade for mowing,
With
The rotary blade for mowing is
A disc-shaped rotary blade body;
A plurality of cutting blades provided so as to protrude around the rotary blade body,
Each of the plurality of cutting blades includes a plurality of divided blades arranged in a circumferential direction of the rotary blade body in a state that is separable from the rotary blade body. The mower according to claim 1,
A mowing machine in which a groove is formed along a boundary between the rotary blade body and the plurality of divided blades. A mower according to claim 1 or claim 2,
A mowing machine in which a thin thin portion is partially formed on the distal end side of the base end portion among the plurality of divided blades. A mower according to claim 3,
The thin wall portion is a mowing machine in which each of the plurality of divided blades is formed at a position closer to the distal end portion than to the proximal end portion. A mower according to claim 3 or claim 4,
Each of the plurality of cutting blades is formed with a thin portion forming groove extending along the circumferential direction of the rotary blade body at a position between a base end portion and a tip end portion of the plurality of divided blades. A mowing machine in which the portion in which the portion forming groove is formed is the thin portion. The mower according to claim 5,
The thin-walled portion forming groove is a mower that is a groove that suddenly becomes deeper at a portion closer to the distal end side of the divided blade than a portion closer to the proximal end side of the divided blade. A mower according to any one of claims 1 to 6,
A mowing machine in which a slit is formed between adjacent ones of the plurality of divided blades. A mower according to claim 7,
A mowing machine further comprising a filling portion filled in the slit. A mower according to any one of claims 1 to 8,
A mowing machine in which a hole is formed in at least a part of the rotary blade body. A mower according to claim 9,
A mowing machine further comprising a cover attached to at least one main surface of the rotary blade for mowing and closing the hole. A mower according to any one of claims 1 to 10,
A rotary body provided on one main surface of the rotary blade for mowing so as to rotate together with the rotary blade for mowing, and a cord supported by the rotary body such that an end portion extends in a direction away from the rotary shaft. A mowing machine further comprising a cord rotating unit including a member. A mower according to claim 11,
The rotating body is
A rotating body main body supported by the support together with the rotary blade for mowing;
A first cover member detachably attached to the rotating body main body in a state in which the cord-like member is wound so that the end portion extends outwardly;
A second cover member detachably attached to the rotating body main body,
With
A mowing machine in which the first cover member and the second cover member are selectively attached to the rotating main body. A mower according to claim 11 or claim 12,
The rotating body is
Including a winding shaft portion and a flange provided on an outer periphery of the winding shaft portion, including a cord reel on which the cord-like member is wound around the winding shaft portion,
A mowing machine in which a cord insertion hole is formed in the buttock along a direction intersecting the thickness direction. A disc-shaped rotary blade body;
A plurality of cutting blades provided so as to protrude around the rotary blade body;
Each of the plurality of cutting blades includes a plurality of divided blades arranged in a circumferential direction of the rotary blade main body in a state that is separable from the rotary blade main body. The rotary blade for mowing according to claim 14,
A rotary blade for mowing, in which a groove is formed along a boundary between the rotary blade body and the plurality of divided blades. The rotary blade for mowing according to claim 14 or 15,
A rotary blade for mowing, in which a thin thin portion is partially formed on the distal end side of the base end portion among the plurality of divided blades. The rotary blade for mowing according to claim 16,
The thin-walled portion is a rotary blade for mowing that is formed at a position closer to the distal end portion than to the proximal end portion in each of the plurality of divided blades. A rotary blade for mowing according to claim 16 or claim 17,
Each of the plurality of cutting blades is formed with a thin portion forming groove extending along the circumferential direction of the rotary blade body at a position between a base end portion and a tip end portion of the plurality of divided blades. A rotary blade for mowing, wherein the portion where the portion forming groove is formed is the thin portion. The rotary blade for mowing according to claim 18,
The thin-walled portion forming groove is a rotary blade for mowing, which is a groove that suddenly becomes deeper at a portion closer to the distal end side of the divided blade than a portion closer to the proximal end side of the divided blade. The rotary blade for mowing according to any one of claims 14 to 19,
A rotary blade for mowing, in which a slit is formed between adjacent ones of the plurality of divided blades. The rotary blade for mowing according to claim 20,
A rotary blade for mowing further provided with a filling portion filled in the slit.

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