JP6494911B2 - Rotary blade for mowing machine and mowing machine using the same - Google Patents

Description

  The present invention relates to a rotary blade for a mower and a mower using the same.

  There is a portable power mower as an instrument for removing weeds growing on the bank of a field. This mower is of a type also called a brush cutter, and is configured to transmit the rotational power generated by a small engine to a rotary blade supported at the tip of an operation tube. Or while controlling the rotation of the rotary blade rotated by this, the operation tube is swung left and right to perform a desired mowing operation.

  Among the rotary blades suitable for this type of portable power mower, examples of nylon cord type rotary blades include those shown in Patent Documents 1 and 2.

  In the rotary blade shown in Patent Document 1, a plurality of circular winding blocks are erected on the upper surface of the peripheral portion of the mounting disk, and the interval between adjacent winding blocks is set so that the nylon cord can pass through. is there. In such a configuration, the nylon cord has a predetermined length, and a large-diameter portion is provided on the base end side by tying a knot at one end, and this is arranged between the adjacent winding blocks from the free end on the front end side. By passing it from the inside of the mounting disk, it can be easily mounted. In this state, in the nylon cord, the large-diameter portion on the proximal end side is locked between the adjacent winding blocks, and the state where the free end on the distal end side extends from the outer periphery of the mounting disk is maintained.

  Further, Patent Document 2 is equipped with a guide member that rotates together with the rotary blade mounting shaft and is supported rotatably around the rotation shaft with respect to the holding member, in addition to the holding member that winds and holds the nylon cord. Nylon cord type rotary blade is shown.

  The rotary blade shown in Patent Document 2 has an adjustment function that allows the extension length to be extended by feeding out the nylon cord wound around the holding member when the extension length of the nylon cord is shortened due to wear. In addition, since the guide member prevents the cutting object such as weeds from entering the inside of the outer periphery of the guide member, the cutting object is efficiently cut by the tip portion of the nylon cord that rotates at high speed. It has a function.

  However, each of the rotary blades shown in Patent Documents 1 and 2 is configured so that one nylon cord extends from each place in the circumferential direction. Naturally, there is a limitation that weeds with thick stems larger than a predetermined size and weeds that have become dry and hard cannot be easily cut.

JP-A-7-177812 International Publication WO 2007/023758

  The present invention has been conceived under the circumstances described above, and provides a rotary blade for a mowing machine having a higher cutting ability while using a nylon cord used in a conventional nylon cord type rotary blade. This is the main issue.

  In order to solve the above problems, the present invention employs the following technical means.

Mower rotary blades provided by the first aspect of the present invention includes a holding member which is rotated is attached to the rotary blade mounting shaft of the mower, the base end side up Symbol holding member is held, the distal end side of the holding member A cord-shaped cutting member that extends outward in the radial direction of the blade, and the cord-shaped cutting member includes a plurality of cord-shaped cutting members that extend from the same circumferential position of the holding member. The holding member is formed by wrapping the cord-shaped cutting member coupled to any of the plurality of coupling portions to which the base end side of the cord-shaped cutting member is coupled and the plurality of coupling portions. A hook portion that extends the distal end side of the cutting member outward in the radial direction of the holding member, and two of the plurality of connecting portions, one end of which is connected to two or more connecting portions. The above cord-shaped cutting part But is wound around the same the hanging turning unit, characterized in that it is by extending radially outwardly of said retaining member.

  In a preferred embodiment, the distances from the plurality of connecting portions to the hanging portion are different from each other.

  In a preferred embodiment, the plurality of connecting portions are arranged at a predetermined interval in a circumferential direction around the rotation center of the holding member.

  In a preferred embodiment, the holding member has a flange portion having a circular outer periphery having a radius larger than the distance from the rotation center to the hanging portion, and the plurality of the plurality of the hanging portions wound around the holding portion. The cord-like cutting member of the book is extended on the upper surface of the flange portion.

  In a preferred embodiment, a grounding member that is rotatable relative to the holding member about the rotation axis of the holding member is further provided below the holding member.

  In a preferred embodiment, the grounding member has an outer diameter that is smaller than the outer diameter of the flange portion and larger than ½ of the outer diameter of the flange portion.

The mower provided by the second aspect of the present invention includes a power source and a rotary blade mounting shaft that is rotationally driven by the power of the power source. The rotary blade for mowers concerning the 1 side is attached, It is characterized by the above-mentioned.

The cord cutting member mounting method in the rotary blade for mower provided by the third aspect of the present invention includes a holding member attached to the rotary blade mounting shaft of the mower and rotated, and a base end side held by the holding member A cord-shaped cutting member whose distal end extends outward in the radial direction of the holding member, and extends a plurality of the cord-shaped cutting members from the same circumferential position of the holding member. A method for attaching a cord-like cutting member in a rotary blade for a mowing machine, wherein the holding member includes any one of a plurality of connecting portions to which proximal ends of the one cord-like cutting members are connected, and the plurality of connecting portions. A hooking portion that hangs the cord-like cutting member connected to the hook and extends the distal end side of the cord-like cutting member outward in the radial direction of the holding member. Two or more of the cord-shaped cutting members, one end of which is connected to two or more connecting portions, are extended around the same hooking portion and extended outward in the radial direction of the holding member. And

It is a perspective view of the rotary blade for mowing machines concerning a 1st embodiment of the present invention. It is a top view of the rotary blade for mowing machines shown in FIG. It is a figure equivalent to the III-III line cross section of FIG. 2, and also shows the attachment structure with respect to a mower. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a bottom view of the grounding member of the rotary blade for mowing machines shown in FIG. It is explanatory drawing of an example of the attachment method of a cord-shaped cutting member (nylon cord). It is a perspective view of the rotary blade for mowing machines concerning a 2nd embodiment of the present invention. It is a top view of the rotary blade for mowing machines shown in FIG. It is a figure equivalent to the XX line cross section of FIG. 9, and also shows the attachment structure with respect to a mower. It is the XI-XI sectional view taken on the line of FIG. It is action | operation explanatory drawing of the rotary blade for mowing machines shown in FIG. It is explanatory drawing of the other example of the attachment method of a cord-shaped cutting member (nylon cord).

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 7 show an embodiment of a rotary blade A for a mower and a mower B using the same according to a first embodiment of the present invention. As clearly shown in FIGS. 1 and 3, in the mower B, a small engine (not shown) as a drive source is connected to the proximal end side of the operation tube 12, and the rotational output thereof is operated. It is configured to be transmitted to the distal end portion of the operation tube 12 via a transmission shaft 13 inserted in the tube 12. As the small engine, for example, an engine with a displacement of about 25 cc is used in consideration of the portability of workers. A small engine may be directly attached to the base end of the operation tube 12, or an engine mounted on a backpack frame, for example, may be connected via a flexible transmission shaft.

  As clearly shown in FIG. 3, the rotary blade mounting shaft 14 is supported on the gear case 16 at the tip of the operation tube 12, and the rotary blade mounting shaft 14 and the transmission shaft 13 are configured with a bevel gear mechanism (not shown). It is linked by. A spline is formed on the outer periphery of the rotary blade mounting shaft 14, and a screw hole 14a extending in the axial direction is formed at the shaft end. A rotating blade holder 17 made of metal is splined to the rotating blade mounting shaft 14. On the lower surface of the rotary blade holder 17, a short-axis columnar bulging portion 17a is formed.

  A rotary blade A characterized by the present invention is attached to the rotary blade mounting shaft 14.

  As shown in FIGS. 1, 2, and 3, the rotary blade A has a holding member 100 that is attached to the rotary blade mounting shaft 14 and rotated, and a base end side is held by the holding member 100. A plurality of cord-shaped cutting members whose front ends extend radially outward of the holding member 100 and the holding member 100 can be rotated relative to the holding member 100 around the rotation axis thereof. And a grounding member 200 supported on the ground. As the cord-shaped cutting member, as shown well in FIG. 4, a commercially available nylon cord 40 having a large diameter portion 40a at the proximal end and a thickness of about 3 mm and a predetermined length can be used.

  As clearly shown in FIG. 3, the holding member 100 includes a horizontal disc-shaped mounting base 110 having a mounting hole 110 a having a diameter corresponding to the outer diameter of the bulging portion 17 a of the rotary blade holder 17, and this mounting. A thick annular portion 120 having an upper surface continuous to the upper surface of the mounting base 110 on the outer periphery of the base 110 and formed thicker than the thickness of the mounting base 110, and a horizontal surface from the lower surface of the thick annular portion 120 And a flange portion 160 extending in the direction and having a constant outer diameter. In the embodiment, the mounting base 110 and the thick annular portion 120 are integrally formed of resin, for example, and the flange portion 160 formed of resin separately from the mounting base 110 is integrated by a screw 152 (see FIG. 5). It has been made. The outer diameter of the flange portion 160 is, for example, 200 to 400 mm, preferably 250 to 350 mm, but is not limited thereto.

  The thick annular portion 120 is a portion that holds a plurality of nylon cords 40, and has the following configurations in two regions facing each other in the diameter direction.

  The thick annular portion 120 is formed with a cord insertion space 130 having a rectangular cross section extending in a range of a central angle of approximately 90 ° along the circumferential direction in which the thick annular portion 120 extends. One end is closed and the other end is open to the outer peripheral surface 120 a of the thick annular portion 120. Four cord connecting portions 141, 142, 143, and 144 are formed at equal intervals on the ceiling wall 131 of the cord insertion space 130. As shown in FIG. 4, each cord connecting portion 141, 142, 143, 144 can be inserted through the general portion of the nylon cord 40, and the hole 132 has a size that cannot be inserted through the large-diameter portion 40 a. Is formed in the ceiling wall 131 in a penetrating manner. In the present embodiment, the seat surface 132a on which the large-diameter portion 40a of the nylon cord 40 is seated is inclined so that the degree of bending of the nylon cord 40 that passes through the hole 132 and reaches the cord insertion space 130 is reduced. And the site | part which the curved part of the nylon cord 40 in the inner wall of the hole 132 contacts is rounded smoothly. Further, in the vicinity of the outlet of the cord insertion space 130, a looping portion 150 for extending the distal end side of the nylon cord 40 inserted through the cord insertion space 130 to extend outward in the radial direction of the holding member 100. Is provided. In the present embodiment, as shown in FIG. 3, the hanging portion 150 is a screw arranged so as to span between a part of the ceiling wall 131 of the thick annular portion 120 and the flange portion 160. It is formed by interposing a cylindrical collar 151 having a predetermined outer diameter so as to be fitted to 152.

  As shown in FIG. 3, the grounding member 200 bulges smoothly downward as a whole, and has a short-axis dome shape accommodated in a space defined by the inner surface of the thick annular portion 120 in the holding member 100. It has a cylindrical portion 210 on the inner periphery. Further, as shown in FIG. 6, four concave grooves 260 extending in the radial direction and arranged in a cross shape are provided on the lower surface of the grounding member 200. The ground member 200 is formed of, for example, metal or resin. The grounding member 200 is attached to the rotary blade mounting shaft 14 or the holding member 100 by interposing a bearing 250 between the bearing receiver 220 integral with the rotary blade mounting shaft 14 or the holding member 100 and the cylindrical portion 210. On the other hand, the rotary blade mounting shaft 14 is rotatably supported around the rotation center.

  In the present embodiment, the rotary blade A having the above-described configuration is configured such that the mounting hole 110a of the mounting base 110 of the holding member 100 is externally fitted to the bulging portion 17a of the rotary blade presser 17, and the bearing holder 230 is placed on the lower surface side of the mounting base 110. As described above, the bearing receiver 220 that rotatably supports the grounding member 200 is overlapped, and the mounting bolt 15 passed from below through the center hole 221 of the bearing receiver 220 and the center hole 231 of the bearing retainer 230 is attached to the rotary blade mounting shaft. It is attached to the rotary blade mounting shaft 14 by being screwed into the 14 screw holes 14a.

  In the present invention, a plurality of nylon cords 40 are extended from the same circumferential direction of the holding member 100. Below, the example of the attachment method of the nylon cord 40 in the case of extending the two nylon cords 40 from the same location of the circumferential direction in the holding member 100 is demonstrated.

  Of the cord connecting portions 141, 142, 143, and 144 provided at the four locations along the cord insertion spaces 130 in the thick annular portion 120, the first cord connecting portion 141 and the second cord are arranged in order from the hung portion 150. The connecting portion 142, the third cord connecting portion 143, and the fourth cord connecting portion 144 are used. The same nylon nylon cord 40 is used, and the base ends are connected to the third and fourth cord connecting portions 143 and 144 as shown in FIGS. Specifically, first, the nylon cord 40 is passed through the holes 132 of the third cord connecting portion 143 and the fourth cord connecting portion 144 from the tip portion thereof, passed through the cord insertion space 130, and the hanging portion 150 is wound around. The holding member 100 is pulled out radially outward. As shown in FIG. 4, these nylon cords 40 have their large-diameter portions 40a on the base end side seated and locked on the inclined seating surface 132a on the outer surface of the hole 132. The side is substantially connected to the third code connection part 143 and the fourth code connection part 144. As a result, the two nylon cords 40 are wound around the same looping portion 150 and are extended in the radial direction from the same circumferential position of the holding member 100. The length of the nylon cord 40 is such that, for example, when the base end is connected to the fourth cord connecting portion 144, the distal end of the nylon cord 40 extends in the radial direction of the holding member 100 and the outer end of the flange portion 160 is Is set so as to protrude about 30 to 60 mm.

  When the mowing operation is performed for a certain period of time using the rotary blade A for mowing machine as will be described later, the tip of the nylon cord 40 is worn, and the length extending from the flange portion 160 gradually decreases. In that case, the nylon cord 40 connected to the third cord connecting portion 143 is reconnected to the second cord connecting portion 142, and the nylon cord 40 connected to the fourth cord connecting portion 144 is connected to the third cord connecting portion. Reconnect to part 143. The nylon cord 40 can be easily removed by pulling the large-diameter portion 40a on the base end side, and the nylon cord 40 can be reconnected to the adjacent cord connecting portion in the same manner as described above. . As a result, the extension length of the nylon cord 40 from the flange portion 160 can be extended by a length corresponding to the distance between the adjacent cord connecting portions 141, 142, 143, and 144. In this way, when the tips of the two nylon cords 40 connected to the second and third cord connecting portions 142 and 143 are worn and shortened again, the first and second cord connecting portions 141 and 142 are further connected to each other. Just reconnect.

  When mowing using the mower B, for example, if the throttle opening of the engine is increased by operating the throttle lever or the like, the holding member 100 or the nylon cord of the rotary blade A is generated by the rotational output of the engine. 40 is rotated. The rotational output of the engine is decelerated from the transmission shaft 13 by a bevel gear (not shown) in the gear case 16 and transmitted to the holding member 100 or the nylon cord 40 via the rotary blade mounting shaft 14. The rotation speed of the holding member 100 or the nylon cord 40 reaches, for example, 5,000 to 6,000 rpm. When the outer diameter of the holding member 100 of the rotary blade A (outer diameter of the flange portion 160) is, for example, 300 mm, the peripheral speed of the nylon cord 40 at the outer peripheral portion of the holding member 100 reaches about 340 km / h. When the rotary blade A is moved along the ground, the cutting object such as weeds is prevented from entering further inward in the radial direction by the flange portion 160, and the transverse by the nylon cord 40 that turns at high speed. It is severed from the direction and cut off.

  And in the rotary blade A of this embodiment, the nylon cord 40 extended from the same location of the holding member 100 becomes two or more. As described above, while the rotary blade A is rotating, the nylon cord 40 collides with an object to be cut such as weeds at high speed and cuts it, but two or more nylon cords 40 collide simultaneously with the object to be cut. Therefore, the impact force received by the object to be cut is several times that of the case where one nylon cord 40 collides. Therefore, weeds with relatively thick stems, weeds that have become dry and hardened can be easily obtained. Can be reaped. Thereby, the application range of the mowing work which can be performed using the safe cord type rotary blade A is greatly expanded. Moreover, since the nylon cord 40 that has been used in this type of cord type rotary blade can be used as it is, it is convenient.

  Further, in the rotary blade A of the present embodiment, a grounding member 200 supported at the lower part of the holding member 100 so as to be rotatable about the rotation axis of the holding member 100 with respect to the holding member 100 or the rotary blade mounting shaft 14 is provided. ing. Since the rotational driving force from the engine does not act on the grounding member 200, the holding member 100 or the nylon cord 40 can be rotated while the grounding member 200 is in contact with the ground. Moreover, since the ground contact member 200 in the present embodiment has a short-axis dome shape that smoothly bulges downward, it can easily slide relative to the ground while being grounded. This means that the mowing operation can be performed while moving the rotary blade A along the ground while supporting the weight of the tip of the operation tube 12 of the mowing machine B or the rotary blade A on the ground via the grounding member 200. Means. As a result, the labor of the operator is remarkably reduced, and a high-quality mowing operation in which the heights of the stumps after mowing are aligned can be performed. And since the grounding member 200 is disposed so as to be accommodated in the space defined by the inner surface of the thick annular portion 120 in the holding member 100, the grass pieces cut by the nylon cord 40 are removed from the grounding member 200. It is possible to effectively avoid the situation of entering the inside and inhibiting the relative rotation of the grounding member 200 with respect to the mounting shaft 14. Furthermore, since the grounding member 200 is provided with a concave groove 260 extending in the radial direction on the lower surface thereof, the grounding member 200 does not rotate carelessly in contact with the ground, and can realize a good sliding motion with respect to the ground.

  8 to 13 show a mowing machine rotary blade A1 according to a second embodiment of the present invention and a mowing machine B1 using the same. The rotary blade A1 for mower of this embodiment is different from the rotary blade A for mower of the first embodiment in the configuration of the grounding member 200a and the attachment structure of the nylon cord 40a, and the other configurations are the same. Below, it demonstrates centering on the difference with respect to the rotary blade A for mowers of 1st Embodiment, About the same member or part as the rotary blade A for mowers, it is the same as having attached | subjected in FIG. 1 thru | or FIG. A detailed description is omitted with reference numerals.

  The grounding member 200a includes a center tube portion 210a that is rotatably supported by a bearing receiver 220 via a pair of upper and lower bearings 250, and an intermediate tube positioned on the inner side of the thick annular portion 120 of the holding member 100. Portion 211a, a donut-shaped bottom wall 212a connecting between the lower ends of the center tube portion 210a and the intermediate tube portion 211a, and a flange portion 213a extending radially outward so as to be continuous with the bottom wall 212a Is provided. The bottom surfaces of the bottom wall portion 212a and the flange portion 213a are substantially flat, and only the outer peripheral portion of the flange portion 213a is displaced slightly upward. The grounding member 200a can be formed of metal or resin, but in this embodiment, as shown in FIG. 10, a metal such as aluminum is provided from the center tube portion 210a to the middle of the bottom wall portion 212a. And the other part can be integrally formed of resin. By doing so, the use of a pair of upper and lower bearings 250 and the central cylindrical portion 210a supported by the bearings 250 are made of metal, so that the rotatable support state of the grounding member 200a is more stable. While being able to be made, weight reduction can also be achieved.

  The outer diameter of the flange portion 213a of the grounding member 200a is smaller than the outer diameter of the flange portion 160 of the holding member 100, and is larger than ½ of the outer diameter of the flange portion 160, preferably 2/3. In a larger range, an appropriate dimension is set based on the following concept.

  That is, since there is a vertical difference between the nylon cord 40a and the bottom surface of the grounding member 200a, in order to cut the weed to be cut at the root, the peripheral portion of the grounding member 200a is grounded as shown in FIG. For example, it is necessary to move the rotary blade A1 while being tilted by 10 ° to 15 ° with respect to the ground in a state where it is grounded. At this time, the outer diameter of the flange portion 213a of the grounding member 200a is set to such an extent that the flange portion 160 of the holding member 100 that rotates at a high speed together with the nylon cord 40a does not contact the ground.

  Next, in the rotary blade A1 of the present embodiment, a nylon cord 40a obtained by cutting a long nylon cord into a predetermined length is used. That is, as clearly shown in FIGS. 11 and 13, both ends of the nylon cord 40 a are inserted into the holes 132 of the third and fourth cord connecting portions 143 and 144, and both ends thereof are passed through the cord insertion space 130. The hanging portion 150 is hung and pulled out radially outward of the holding member 100. Accordingly, the two nylon cords 40a whose base ends are connected to the third and fourth cord connecting portions 143 and 144 are the same as those extended from the same circumferential position in the holding member 100. Since the two nylon cords 40a are connected to one on the outer surface side of the third and fourth cord connecting portions 143 and 144, they do not fall out carelessly. In addition, the length of one nylon cord used so that the tip of the two nylon cords 40a extends from the outer edge of the flange portion 160 by about 30 to 60 mm with the two nylon cords 40a extending in the radial direction of the holding member 100. Is set.

  When the mowing operation is performed for a certain period of time using the rotary blade A1 for the mower, the tip of the nylon cord 40a wears and the length extending from the flange portion 160 gradually decreases. The portion of the upper surface of the annular portion 120 that extends between the third cord connecting portion 143 and the fourth cord connecting portion 144 is pulled to pull out the nylon cord, and into each hole 132 of the second and third cord connecting portions 142, 143. Both ends of the nylon cord 40a are inserted and passed through the cord insertion space 130, and the hanging portion 150 is hung and pulled out in the radial direction of the holding member 100. Thereby, the extension length from the outer edge of the flange part 160 of the nylon cord 40a can be extended by the length corresponding to the distance between the adjacent cord connecting parts 141, 142, 143, and 144. When the end of the nylon cord 40a is worn again and the extension length from the flange portion 160 is shortened, the nylon cord 40a is extracted in the same manner as described above, and both ends are connected to the first and second cord connecting portions. It suffices to insert them into the holes 132 of 141 and 142 and hang around the wrapping portion 150 in the same manner as described above and pull it outward in the radial direction.

  The rotary blade A1 for the mower according to the second embodiment is relative to the rotary blade mounting shaft 14 in that a plurality of nylon cords 40a are extended from the same place in the circumferential direction of the holding member 100. In common with the rotary blade A for mowers of the first embodiment, the rotary grounding member 200a is provided. Accordingly, even when the mowing operation is performed using the rotary blade A1 for the mower according to the second embodiment, the mowing operation is performed using the rotary blade A for the mower according to the first embodiment, as described above. Thus, weeds that are to be cut can be cut very efficiently.

  In particular, the rotary blade A1 for the mower of the second embodiment has a particularly large outer diameter of the grounding member 200a and a wide flat area on the bottom surface. It can be stably moved along the ground while being grounded. Further, since the outer diameter of the grounding member 200a is large as described above, as shown in FIG. 12, for example, the rotary blade A1 is grounded, for example, 10-15 with respect to the ground while grounding the periphery of the grounding member 200a. Even when the object to be cut such as weed is to be cut from its root, the flange portion 160 that rotates at high speed together with the nylon cord 40a inadvertently contacts the ground and the rotation of the rotary blade A1 is decelerated. Efficiently avoiding and efficient mowing work can be continued.

  Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the claims are all encompassed in the scope of the present invention.

  The specific configuration for extending a plurality of nylon cords 40, 40a (cord cutting blades) from the same circumferential position of the holding member 100 is not limited to that of the embodiment.

  In each embodiment, the four cord connecting portions 141, 142, 143, and 144 are provided side by side in the circumferential direction, but the number of the cord connecting portions may be two or more.

  In the first embodiment, of the four cord connecting portions 141, 142, 143, and 144, two cord connecting portions are used, and the base ends of two nylon cords 40 are connected to two adjacent cord connecting portions. The example in which the tip end sides of the two nylon cords 40 extend from the same looping portion 150 has been described, but three cord connecting portions are used and three nylon cords 40 are adjacent to each other. You may make it connect with a connection part and the front end side of the three nylon cords 40 may extend from the same hanging part 150. FIG.

  Further, the holding member 100 in each embodiment holds the proximal end side of the nylon cord 40 having a predetermined length, but the nylon cord holding form is not limited to this. For example, as shown in Patent Document 2 (International Publication No. WO2007 / 023758), a long nylon cord is used as a holding member, and a plurality of these are used. These nylon cords may be wound and held so that two or more nine cords are led out from one lead-out hole.

  Furthermore, the mowing machine B to which the rotary blade A of the present invention is attached is not limited to the one having the rotary blade attachment shaft 14 at the tip of the operation tube 12 as shown in FIGS. 1 and 3. The rotary blade of the present invention is also attached to a so-called self-propelled mower or the like having a power source such as an engine and a rotary blade mounting shaft that is rotationally driven by the power source on a frame having wheels and movable on the ground. Can be used.

A, A1 Rotary blade B Mower 40, 40a Nylon cord (Cord-like cutting member)
14 Rotating blade mounting shaft 17 Rotating blade holder 17a Swelling part (for rotating blade holder)
DESCRIPTION OF SYMBOLS 100 Holding member 110 Mounting base 120 Thick annular part 130 Code insertion space 141,142,143,144 Code connection part 150 Hanging part 160 Flange part 200,200a Grounding member

Claims (8)

A holding member that is attached to a rotary blade attachment shaft of a mowing machine and is rotated; and a cord-like cutting member that is held by the holding member at a proximal end side and that has a distal end side that extends radially outward of the holding member. The cord-shaped cutting member is a rotary blade for a mowing machine in which a plurality of the cord-shaped cutting members are extended from the same location in the circumferential direction of the holding member,
The holding member has a plurality of connecting portions to which the base end side of the cord-like cutting member is connected, and the cord-like cutting member connected to any of the plurality of connecting portions to hang around the cord-like cutting member. A winding portion that extends the distal end side radially outward of the holding member, and
Among the plurality of connecting portions, two or more cord-like cutting members having one ends connected to two or more connecting portions are wound around the same hooking portion and radially outward of the holding member. A rotary blade for a mower characterized by being extended. The distance from the plurality of connecting portions to the hanging turning portion are different respectively, the mower for rotary blade according to claim 1.   The rotary blade for a mowing machine according to claim 2, wherein the plurality of connecting portions are arranged at a predetermined interval in a circumferential direction around the rotation center of the holding member.   The holding member has a flange portion having a circular outer periphery having a radius larger than the distance from the rotation center to the hung portion, and the plurality of cord-like cuts wound around the hung portion. The rotary blade for a mowing machine according to any one of claims 1 to 3, wherein the member is extended on an upper surface of the flange portion. The rotary blade for mowing machines according to claim 4 , further comprising a grounding member that is rotatable relative to the holding member about the rotation axis of the holding member at a lower position of the holding member.   The rotary blade for a mowing machine according to claim 5, wherein the grounding member has an outer diameter that is smaller than an outer diameter of the flange portion and larger than a half of an outer diameter of the flange portion. A power source and a rotary blade mounting shaft that is rotationally driven by the power of the power source;
The mowing machine according to any one of claims 1 to 6 , wherein the rotary blade mounting shaft is attached to the rotary blade mounting shaft. A holding member that is attached to a rotary blade attachment shaft of a mowing machine and is rotated; and a cord-like cutting member that is held by the holding member at a proximal end side and that has a distal end side that extends radially outward of the holding member. A method for attaching a cord-like cutting member in a rotary blade for a mowing machine, wherein a plurality of cord-like cutting members are extended from the same circumferential position of the holding member,
The holding member hangs around the cord-like cutting member connected to any one of the plurality of connecting portions and the plurality of connecting portions to which the base ends of the one cord-like cutting member are connected, and the cord A hanging portion that extends the distal end side of the cutting member outward in the radial direction of the holding member, and
Two or more cord-like cutting members, one end of which is connected to two or more connecting portions among the plurality of connecting portions, are hung on the same hanging portion and extend outward in the radial direction of the holding member. A method for attaching a cord-like cutting member in a rotary blade for a mowing machine, characterized in that:

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