WO2019198121A1

WO2019198121A1 - Rotating blade for grass trimmer and grass trimmer using same

Info

Publication number: WO2019198121A1
Application number: PCT/JP2018/014864
Authority: WO
Inventors: 正範小林
Original assignee: 有限会社小林産業
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2019-10-17

Abstract

[Problem] To provide a rotating blade for a grass trimmer configured in such a manner as to allow the extension length of a cord-shaped cutting member to be adjusted simply, and also to allow the cord-shaped cutting member to be replaced simply. [Solution] The rotating blade A for a grass trimmer comprises a holding member 100 that is attached to a rotating blade attachment axis 14 of the grass trimmer B and is made to rotate, and a holding mechanism 200 holding the cord-shaped cutting member 40 in such a manner that the proximal end side thereof is held by the holding member 100 and the distal end side thereof extends outward in the radial direction of the holding member. The holding mechanism 200 comprises a coupling part 210 whereto one end of the cord-shaped cutting member 40 is connected, a plurality of wrapping parts 220a, 220b, 220c, 220d arranged in the circumferential direction of the holding member 100, wherearound the cord-shaped cutting member 40 is wrapped, and a mounting facilitation means 300 facilitating the mounting of the cord-shaped cutting member 40. The mounting facilitation means 300 is formed from a groove section 122 opening outward in the radial direction of the holding member 100 and includes a straight line L which joins, from among the plurality of wrapping parts 220a, 220b, 220c, 220d, the back position of the wrap part 220a closest to the coupling part 210 to the back position of the wrap part 220d most distant from the coupling part 210.

Description

Rotary blade for mowing machine and mowing machine using the same

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

There is a portable power mower as a tool for removing weeds growing on the bank of the 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 to perform a desired mowing operation.

Among the rotary blades suitable for this type of portable power mower, there is, for example, the one disclosed in Patent Document 1 as a nylon cord type rotary blade.

The rotary blade described in Patent Document 1 can be easily replaced when the nylon cord is worn and shortened, but when the tip of the nylon cord is gradually worn and shortened. The adjustment function for extending the extension length is not considered.

On the other hand, Patent Document 2 is equipped with a guide member that rotates together with the rotary blade attachment 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, the rotary blade shown in Patent Document 2 has a drawback in that the structure of the holding member is complicated, heavy, and expensive. In addition, when the configuration of Patent Document 1 is adopted as the nylon cord holding mechanism of the rotary blade shown in Patent Document 2, the weight reduction can be achieved and the cost can be reduced, but the extension length of the nylon cord can be adjusted. There is a problem that it is not possible and it becomes unusable.

Japanese Patent Laid-Open No. 7-177812 International Publication WO 2007/023758

The present invention has been conceived under the circumstances described above, and it is possible to easily adjust the extension length of the nylon cord and to easily replace the nylon cord. The main subject is to provide a nylon cord type rotary blade for a mowing machine configured as described above.

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

The rotary blade for mower provided by the first aspect of the present invention includes a holding member that is attached to a rotary blade mounting shaft of a mowing machine and is rotated, a proximal end side is held by the holding member, and a distal end side is the holding member. A rotary blade for a mower with a holding mechanism for holding the cord-like cutting member so as to extend outward in the radial direction, wherein the holding mechanism is connected to one end of the cord-like cutting member And a plurality of looping portions around which the cord-like cutting member is looped, and attachment facilitating means for facilitating the attachment of the cord-like cutting member. The mounting facilitating means includes a straight line connecting a back position of a hanging portion farthest from the connecting portion from a back position of the hanging portion closest to the connecting portion among the plurality of hanging portions, Holding part Characterized in that it is formed by a groove section for the open radially outwardly.

In a preferred embodiment, the connecting portion includes a wall portion formed on the holding member and a slit through which the cord-like cutting member formed on the wall portion can pass, and the cord-like cutting member has one end. The one end is connected by fitting the cord-shaped cutting member into the slit so that the large diameter portion is locked to the side surface of the wall portion. The

In a preferred embodiment, the slit is provided so as to open to the upper surface of the wall portion, and the cord-like cutting member is fitted into the slit from above.

In a preferred embodiment, a convex portion protruding outward in the radial direction of the holding member is formed between the wall portion and the hanging portion closest to the wall portion.

In a preferred embodiment, the hanging portion is configured by attaching a drum-shaped roller-shaped member having an outer circumferential groove having a concave curved cross section to a horizontal upper surface of a support wall formed on the peripheral portion of the holding member. Has been.

In a preferred embodiment, the roller member is supported so as to be rotatable or non-rotatable around the axis so as to have an axis perpendicular to the upper surface of the support wall.

In a preferred embodiment, the holding member is provided with a detachment preventing means for preventing the cord-shaped cutting member wound around the roller-shaped member from being detached from the roller-shaped member.

In a preferred embodiment, the detachment preventing means includes a first detachment prevention means, and the first detachment prevention means passes through the cord-shaped cutting member with respect to the upper end height position of the roller-shaped member. It is constituted by a separation preventing wall located at a higher position with a gap therebetween.

In a preferred embodiment, the separation preventing wall is formed with a notch that is recessed from the outer periphery thereof and faces the roller-like member in plan view.

In a preferred embodiment, the separation prevention means includes a second separation prevention means, and the second separation prevention means is located radially outward of the holding member between two adjacent roller-shaped members. Protruding portions that protrude toward the surface are provided, and the groove portions in the mounting facilitating means are provided on the protruding portions.

In a preferred embodiment, the separation preventing means further includes a second separation preventing means, and the second separation preventing means provides a protrusion between two adjacent roller-shaped members, and the protrusion It is comprised by providing the said groove part in the said attachment facilitating means in a part.

In a preferred embodiment, the holding mechanism is provided at two places facing the diameter direction of the holding member.

In a preferred embodiment, a guide member that can rotate relative to the holding member about the rotation axis is provided below the holding member.

The mower provided by the second aspect of the present invention includes a rotary blade mounting shaft that is rotationally driven, and the rotary blade mounting shaft is attached with the rotary blade for the mower according to the first aspect. Features.

Other features and advantages of the present invention will become more apparent from the description of embodiments described below with reference to the drawings.

It is a whole lineblock diagram of an example of a mowing machine in which a rotary blade for mowing machines of the present invention is used. It is a principal part enlarged view of FIG. It is the III-III arrow directional view of FIG. FIG. 4 is a view showing an embodiment of the rotary blade for mower of the present invention and corresponding to the view taken along the line IV-IV in FIG. 1. It is the VV sectional view taken on the line of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG. FIG. 7 is an explanatory diagram of an operation, and corresponds to a cross section taken along line VII-VII in FIG. 5.

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

FIG. 1 to FIG. 10 show a mower B using a rotary blade A for mowing machine (hereinafter simply referred to as “rotary blade A”) according to an embodiment of the present invention. As clearly shown in FIG. 1, in the mower B, a small engine 10 as a drive source is connected to the proximal end side of the operation tube 12, and the rotation output thereof is a transmission shaft (not shown). ) Is transmitted to the rotary blade mounting shaft 14 protruding from the gear box 16 having a built-in speed reduction mechanism 16a supported on the distal end of the operation tube 12. As the small engine 10, for example, an engine with an engine displacement of about 25 cc is used in consideration of the portability of the operator.

Male screws

14a and 14b are formed on the base end side large diameter portion and the distal end side small diameter portion of the rotary blade mounting shaft 14, respectively, and a metal rotary blade holder 17 is screwed onto the base end side male screw 14a. ing.

The mower B according to the present embodiment is configured so that the support angle of the rotary blade A can be changed by rotating the operation lever 18 as follows.

As shown in FIGS. 1 and 2, the operation tube 12 has a distal end side second portion 12 b that is always moved toward the distal end by a coil spring 19 inserted into the operation tube 12 with respect to the proximal end side first portion 12 a. Combined to be stretchable while being energized. A flexible tube 20 having a distal end extending from the distal end of the operation tube 12 is inserted into the operation tube 12, and a transmission shaft 11 having at least a distal end is inserted into the flexible tube 20. Yes. The rotational driving force of the transmission shaft 11 is transmitted to the rotary blade mounting shaft 14 protruding from the gear box 16. The operation lever 18 is rotatably supported by the second portion 12b while being given a certain resistance. The operation lever 18 is formed with a reel portion 18a, and by rotating the operation lever 18 back and forth, the other end of the cable 21 having one end connected to the first portion 12a is wound or fed out to the reel portion 18a. You can do that. By rotating the operation lever 18 in the cable winding direction, the second portion 12b can be retracted in the proximal direction of the operation tube 12 against the elasticity of the coil spring 19, and the total length of the operation tube 12 can be shortened. The second portion 12b can be extended in the direction of the distal end of the operation tube 12 by the elasticity of the coil spring 19 by rotating in the cable feeding direction, and the entire length of the operation tube 12 can be extended.

An arm 12c extending obliquely downward is fixedly connected to the distal end portion of the second portion 12b of the operation tube 12, and the gear box 16 is centered on the lateral axis 22 at the distal end of the arm 12c. It is rotatably supported. Since the total length of the flexible tube 20 and the transmission shaft 11 inserted therein is constant, when the total length of the operation tube 12 is extended by the operation of the operation lever 18, the flexible tube 20 is connected to the operation tube 12. When the entire length of the operation tube 12 is shortened by being pulled inside, the flexible tube 20 is pushed out from the tip of the operation tube 12. As a result, the gear box 16 and the rotary blade A supported by the gear box 16 rotate about the lateral axis 22, thereby changing the angle of the rotary blade A with respect to the operation tube 12 as desired.

A handle 23 is provided at an appropriate part of the operation tube 12 so that the operator can hold it and swing the operation tube 12 left and right.

The configuration and type of mower B are not limited to those described above. For example, the small engine 10 may be directly attached to the proximal end of the operation tube 12 as in the embodiment, or the engine is mounted on, for example, a back frame through a flexible transmission shaft inserted into the bellows tube. May be concatenated. There is also a type in which the rotary blade is directly driven to rotate by a small engine mounted at the tip of the operation tube. Alternatively, there is a type in which an engine and a power transmission mechanism are mounted on a wheeled frame, thereby rotating the rotary blade. In short, the present invention can be applied to any type of mower as long as it includes a rotary blade mounting shaft that is driven to rotate by an appropriate power source.

Rotating blade A characterized by the present invention is mounted on the rotating blade mounting shaft 14.

As shown in FIGS. 4 to 7, the rotary blade A is attached to the rotary blade mounting shaft 14 and rotated, and the holding member 100 that holds the cord-like cutting member 40 and the holding member 100. A guide member 500 is provided that can rotate relative to the member 100 around its rotational axis (same axis as the rotary blade mounting shaft 14). In the following description, the radial direction means the radial direction of the holding member 100 or the rotary blade A.

The holding member 100 includes a holding mechanism 200 that holds the proximal end portion of the cord-shaped cutting member 40. The holding member 100 is generally circular in plan view, and has an upper support plate portion 110 that is provided with a boss portion 102 having a center hole 101 at the center and in which a plurality of concave-curved cutout portions 111 are formed on the outer periphery. In addition, the holding mechanism 200 is provided below the outer peripheral region of the upper support plate portion 110. The holding member 100 can be configured by resin integral molding except for portions to be generated with metal for strength maintenance, such as hanging

portions

220a, 220b, 220c, and 220d to be described later and attachment members thereof.

A lower part of the upper support plate part 110 has a substantially same outer diameter as that of the upper support plate part 110 through a connecting wall part 120 that is positioned so as to surround the boss part 102 and has a predetermined height in the vertical direction. And a lower support plate portion 130 that extends outward from the connecting wall portion 120 in a horizontal flange shape. The holding mechanism 200 is formed on the horizontal upper surface (support wall) of the lower support plate portion 130.

In the present embodiment, the lower support plate 130 is divided into two in the circumferential direction, and the two holding mechanisms 200 having the same configuration are provided. The holding mechanism 200 is arranged in the circumferential direction of the connecting portion 210 to which the large-diameter portion 41 at one end of the cord-like cutting member 40 is connected and the lower support plate portion 130, and the cord-like cutting member 40 is wound around. It basically has a plurality of hanging

portions

220a, 220b, 220c, and 220d. As the cord-shaped cutting member 40, for example, one end of a nylon cord is crushed by heat or knotted to form a large-diameter portion, or a nylon cord material cut to a predetermined length A commercially available product having a cylindrical large-diameter portion 41 formed at one end thereof is used.

As shown in FIGS. 4 and 7-9, the connecting portion 210 is formed on the lower support plate portion 130 facing upward by providing a recessed portion 112 on the outer periphery of the upper support plate portion 110. The wall portion 211 that is also connected to the portion 120 is erected, and the wall portion 211 is formed by providing a slit 212 that opens on the upper surface thereof. The slit 212 has a width that allows the cord-shaped cutting member 40 to pass therethrough and prevents the large-diameter portion 41 from passing therethrough.

In the present embodiment, in each holding mechanism 200, the

wrapping portions

220a, 220b, 220c, and 220d are the first wrapping portions 220a that are located at a predetermined interval in the circumferential direction of the rotary blade A with respect to the connecting portion 210. And four hung portions including second, third, and fourth hung

portions

220b, 220c, and 220d that are located at predetermined intervals in the circumferential direction with respect to the first hung portion 220a. It is configured. Each of the hanging

portions

220a, 220b, 220c, and 220d has a drum shape having an outer circumferential groove having a concave cross section on a support shaft 222 that is erected vertically to the upper surface (support wall) of the lower support plate portion 130. The roller member 221 is supported. In this way, the roller-like member 221 is supported by the cantilevered support shaft 222 whose lower end is fixed to the lower support plate portion 130, and the lower surface of the upper support plate portion 110 and each roller-like member 221 are supported. A gap S is formed between the upper end so that the cord-like cutting member 40 can pass in the lateral direction. Further, the notch 111 is formed at the upper position of each roller-like member 221 in the upper support plate portion 110 so that each roller-like member 221 faces in plan view.

The holding mechanism 200 also includes an attachment facilitating means 300 that facilitates the attachment of the cord-like cutting member 40, and the attachment facilitating means 300 includes a plurality of hanging

portions

220a, 220b, 220c, and 220d. A straight line L connecting the rear position of the hanging portion 220d (fourth hanging portion) farthest from the connecting portion 210 from the rear position of the hanging portion 220a (first hanging portion) closest to the connecting portion 210. It is formed by providing a groove portion 122 that includes and opens outward in the radial direction of the holding member 100. In the present embodiment, the connecting wall portion 120 includes a protrusion 121 that protrudes between adjacent winding

portions

220a, 220b, 220c, and 220d (the protrusion 121 corresponds to each roller in the upper support plate 110). The protrusions 113 formed on the outer periphery of the upper support plate 110 are provided by providing the notches 111 at the upper position of the shaped member 221). 121 or the connecting wall 120 is dug inward in the radial direction so that the bottom 122a has a groove 122 extending linearly from a position behind the first hook 220a to a position behind the fourth hook 220d. Forming. The bottom 122a of the groove 122 does not necessarily have to be linear, and may be a groove formed deeper as long as the straight line L is included. The vertical width of the groove 122 corresponds to the diameter of the cord-like cutting member 40, and is preferably set to a vertical width that can restrain the cord-like cutting member 40 fitted in the groove 122 in the vertical direction.

In this embodiment, the holding mechanism 200 also prevents the cord-like cutting member 40 hung around the

hung portions

220a, 220b, 220c, 220d from being detached from the 220a, 220b, 220c, 220d. One detachment prevention means 410 and a second detachment prevention means 420 are provided. The first detachment preventing means 410 is a protrusion formed on the outer periphery of the upper support plate portion 110 by providing a notch portion 111 at an upper position of each of the hanging

portions

220a, 220b, 220c, 220d in the upper support plate portion 110. The portion 113 functions as the first detachment prevention means 410 (detachment prevention wall). As described above, there is a gap between the lower surface of the protruding portion 113 and the upper end of the roller-like member 221 (the

hung portions

220a, 220b, 220c, and 220d) that allows the cord-like cutting member 40 to pass in the lateral direction. S is formed. As for the second detachment preventing means 420, the groove 122 formed as the attachment facilitating means 300 also functions as the second detachment preventing means 420.

In the present embodiment, a third detachment preventing means 430 for preventing the cord-like cutting member 40 connected to the connecting portion 210 from easily detaching from the connecting portion 210 is further provided. The third detachment preventing means 430 includes a convex portion 123 protruding outward in the radial direction from the connecting wall portion 120 between the wall portion 211 forming the connecting portion 210 and the first hanging portion 220a. The cord-shaped cutting member 40 having the base end connected to the connecting portion 210 goes around the convex portion 123 and then goes to the back of the first hanging portion 220a.

As can be seen from FIGS. 4 and 7, the holding member 100 of the present embodiment is configured symmetrically with respect to the diameter connecting the two connecting portions 210 located on the opposite side across the center. As a result, the cord-shaped cutting member 40 can be hung from the connecting portion 210 along the clockwise route to the

hung portions

220a, 220b, 220c, 220d, and conversely, from the connecting portion 210 along the counterclockwise route. It can also be hung around the

hung portions

220a, 220b, 220c, and 220d. With such a configuration, the cord-shaped cutting member 40 can be appropriately mounted according to the rotation direction of the rotary blade A.

The guide member 500 includes a central cylindrical portion 511 and a circular disc portion 520 extending from the lower end of the central cylindrical portion 511. The circular disc portion 520 extends horizontally to the vicinity corresponding to the outer periphery of the holding member 100, The outer peripheral side is displaced upward. Thus, the guide member 500 in the present embodiment has an outer diameter larger than the maximum outer diameter of the holding member 100. In this embodiment, the vicinity of the central cylinder portion 511 is made of metal, and the remaining portion of the circular disc portion 520 is made of resin. Two bearings 530 stacked in the axial direction are held on the inner surface of the central cylindrical portion 511 of the guide member 500 by press-fitting the outer ring 531. The guide member 500 is a screw that passes through the center hole 101 of the bearing 530 and the boss portion 102 of the holding member 100 in a state where the inner ring 532 of the upper bearing 530 is in contact with the lower surface of the boss portion 102 of the holding member 100. By screwing the tip female screw portion of the shaft 15 into the tip-side male screw 14b of the rotary blade mounting shaft 14, the screw shaft 15 is supported so as to be relatively rotatable around the axis (axis of the rotary blade mounting shaft 14). Is done. At the same time, the holding member 100 is supported so as not to rotate relative to the rotary blade mounting shaft 14.

As shown in FIG. 10, the cord-shaped cutting member 40 is inserted between the convex portion 123 and the first hanging portion 220 a from the tip end side, and the tip is passed through the groove portion 122 to the fourth hanging portion. 220d is further extended outward in the radial direction from the rear side, and the base end portion is turned outside the convex portion 123, and then fitted into the slit 212 from the upper surface of the wall portion 211, and finally the large diameter portion. By pulling the distal end side so that 41 is locked to the side surface of the wall portion 211, it is held by the holding mechanism 200. As described above, since the groove portion 122 forming the attachment facilitating means 300 includes the straight line L from the back position of the first hooking portion 220a to the back position of the fourth hooking portion 220d, Thus, the cord-like cutting member 40 can be easily guided to a required position by simply inserting it without bending, and can be connected to the connecting portion 210 simply by being fitted into the slit 212 of the wall portion 211. The cord-shaped cutting member 40 can be mounted very easily. In the mounted state, the

hooks

220a, 220b, 220c, and 220d are provided by the protrusion 121 (detachment prevention wall) that is the first detachment prevention means 410 and the groove 122 that can function as the second detachment prevention means 420. The cord-like cutting member 40 can be prevented from being detached from. Further, the base end portion of the cord-shaped cutting member 40 is fitted from above into the slit 212 in a state where it is forcibly bent by the convex portion 123 forming the third detachment preventing means 430. It does not easily leave 212.

The cord-shaped cutting member 40 becomes gradually shorter due to wear. In this case, the extension length of the cord-shaped cutting member 40 can be extended as follows. That is, the cord-shaped cutting member 40 that has been initially wound around the fourth hooking portion 220d is looped around the third hooking portion 220c as shown by the phantom line in FIG. In the present embodiment, a gap S through which the cord-like cutting member 40 can pass in the lateral direction is formed between the upper end of each roller-like member 221 and the upper support plate portion 110, and the outer periphery of the upper support plate portion 110. Since the notches 111 are formed so that each roller-like member 221 faces upward, the work of detaching the cord-like cutting member 40 from the roller-like member 221 and the work of hanging around the adjacent roller-like member 221 Can be easily performed. In this way, the extension length of the cord-like cutting member 40 is extended by a length corresponding to the distance between the adjacent roller-like members 221. When the distal end of the cord-like cutting member 40 is worn again and the extension length is shortened, the cord-like cutting member 40 is operated from the third hooking portion 220c to the second hook by performing the same operation as described above. What is necessary is just to hang around the rotation part 220b again. When the distal end of the cord-like cutting member 40 is further worn and the extension length is shortened, the cord-like cutting member 40 is similarly changed from the second hanging portion 220b to the first hanging portion 220a. Just hang it around. When the extension length is further shortened in the state of being hung around the first hanging portion 220a, the cord-like cutting member 40 is replaced. By pulling and pulling out, it can be easily removed, and a new cord-like cutting member 40 can be easily attached as described above.

When mowing using the mower B, for example, if the throttle opening of the small engine 10 is increased by operating a throttle lever or the like, the rotation output of the small engine 10 causes the rotary blade A to be held. The member 100 or the cord-shaped cutting member 40 is rotated. The rotational speed of the cord-like cutting member 40 can be adjusted by adjusting the throttle opening of the engine. The rotational output of the engine is decelerated from the transmission shaft 13 by the speed reduction mechanism 16 a in the gear box 16, and is transmitted to the holding member 100 or the cord-shaped cutting member 40 via the rotary blade mounting shaft 14. The rotation speed of the holding member 100 or the cord-shaped cutting member 40 reaches, for example, 5,000 to 6,300 rpm. When the outer diameter of the rotary blade A (the outer diameter of the guide member 500) is, for example, 300 mm, the peripheral speed of the distal end portion of the cord-shaped cutting member 40 easily reaches 350 km / h. When the rotary blade A is moved along the ground, a relatively soft and thin object such as weed is prevented from entering further inward in the radial direction by the guide member 500, and the cord turns at high speed. In response to a strong collision from the lateral direction by the cutting member 40, it is cut without difficulty by the impact. The cord-shaped cutting member 40 has a diameter of about 3 mm at most and is lightweight. However, since the peripheral speed of the tip is extremely high as described above, it is necessary to cut a soft stalk such as weed. It has enough kinetic energy.

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 included in the scope of the present invention.

In the rotary blade A according to the embodiment, the roller-shaped member 221 is fixed to the lower support plate portion 130 via the support shaft 222, but the roller-shaped member 221 can rotate with respect to the support shaft 222. You may support as follows. By doing so, the roller-like member 221 is not worn by the cord-like cutting member 40, which is advantageous in extending the life of the rotary blade A.

In the rotary blade A according to the embodiment, four hung

portions

220a, 220b, 220c, and 220d arranged in the circumferential direction are provided in two regions, and the two cord-like cutting members 40 extend from the holding member 100. However, the number of the

wrapping portions

220a, 220b, 220c, and 220d in each region may be any number as long as it is plural. Alternatively, the holding member 100 may have three or more circumferential regions, and the number of the cord-shaped cutting members 40 extending from the holding member 100 may be three or more.

In the rotary blade A according to the embodiment, the guide member 500 that can rotate relative to the holding member 100 or the rotary blade mounting shaft 14 is also provided. Whether or not the guide member 500 is provided is a matter of choice. .

A Rotary blade for mowing machine B Mowing machine S Clearance L Straight line 10 Small engine 11 Transmission shaft 12 Operation tube 12a First part (of operation tube)
12b Second part (of the operation tube)
12c Arm 13 Transmission shaft 14 Rotating

blade mounting shaft

14a, 14b Male thread portion 15 Screw shaft 16 Gear box 17 Rotating blade retainer 18 Operation lever 18a Reel portion 19 Coil spring 20 Flexible tube 21 Cable 22 Lateral shaft 23 Handle 40 Cord shape Cutting member 41 Large diameter portion 100 Holding member 101 Center hole 102 Boss portion 110 Upper support plate portion 111 Notch portion 112 Recess portion 113 Projection portion 120 Connecting wall portion 121 Projection portion 122a Bottom portion 122 Groove portion 123 Protrusion portion 130 Lower support plate portion 200 Holding mechanism 210 Connecting portion 211 Wall portion 212

Slit

220a, 220b, 220c, 220d Hanging portion 221 Roller member 222 Support shaft 300 Attachment facilitating means 410 First detachment preventing means 420 Second detachment preventing means 430 Third Withdrawal Stop means 500 guiding member 511 central cylinder portion 520 circular disk portion 530 bearing 531 outer ring 532 inner ring

Claims

A holding member attached to the rotary blade mounting shaft of the mower and rotated;
A holding mechanism for holding the cord-shaped cutting member so that the proximal end side is held by the holding member and the distal end side is extended radially outward of the holding member;
A rotary blade for a mower equipped with
The holding mechanism includes a connecting portion to which one end of the cord-like cutting member is connected, a plurality of hanging portions that are arranged in the circumferential direction of the holding member and around which the cord-like cutting member is hung, and the cord-like cutting Mounting facilitating means for facilitating mounting of the member,
The attachment facilitating means includes a straight line that connects a back position of a hanging portion farthest from the connecting portion to a rear position of the hanging portion that is the closest to the connecting portion among the plurality of hanging portions, and the holding A rotary blade for a mowing machine, characterized in that the rotary blade is formed by a groove that opens outward in the radial direction of the member.
The connecting portion includes a wall portion formed on the holding member and a slit through which the cord-like cutting member formed on the wall portion can pass, and the cord-like cutting member has a large-diameter portion at one end. The one end is connected by fitting the cord-shaped cutting member into the slit so that the large diameter portion is locked to the side surface of the wall portion. The rotary blade for the mower described.
The rotary blade for a mowing machine according to claim 2, wherein the slit is provided so as to open to an upper surface of the wall portion, and the cord-shaped cutting member is fitted into the slit from above.
The rotary blade for a mowing machine according to claim 3, wherein a convex portion protruding outward in the radial direction of the holding member is formed between the wall portion and the hanging portion closest to the wall portion. .
The said hanging part is configured by attaching a drum-shaped roller-shaped member having an outer peripheral groove having a concavely curved cross section to a horizontal upper surface of a support wall formed on the peripheral part of the holding member. The rotary blade for mowers according to any one of 1 to 4.
The rotary blade for a mowing machine according to claim 5, wherein the roller-shaped member is supported so as to be rotatable or non-rotatable around the axis so as to have an axis perpendicular to the upper surface of the support wall.
The rotary blade for a mowing machine according to claim 6, wherein the holding member is provided with a detachment preventing means for preventing the cord-shaped cutting member wound around the roller-shaped member from detaching from the roller-shaped member. .
The detachment preventing means includes first detachment prevention means, and the first detachment prevention means is located above a gap at which the cord-like cutting member can pass with respect to an upper end height position of the roller-like member. The rotary blade for mowing machines according to claim 7, wherein the rotary blade is configured by a separation preventing wall located at the position.
The rotary blade for a mowing machine according to claim 8, wherein the separation preventing wall is formed with a notch portion that is recessed from an outer periphery thereof so that the roller-shaped member faces in a plan view.
The separation prevention means includes a second separation prevention means, and the second separation prevention means is a protrusion that protrudes radially outward of the holding member between two adjacent roller-like members. The rotary blade for mowing machine according to claim 7, wherein the protrusion is provided with the groove in the attachment facilitating means.
The separation prevention means further includes a second separation prevention means, and the second separation prevention means is provided with a protrusion between two adjacent roller-shaped members, and the attachment is easy on the protrusion. The rotary blade for mowing machines according to claim 8 or 9, wherein the rotary blade is configured by providing the groove portion in the converting means.
The rotary blade for a mower according to any one of claims 1 to 11, wherein the holding mechanism is provided at two locations facing the diameter direction of the holding member.
The rotary blade for a mowing machine according to any one of claims 1 to 12, further comprising a guide member that is rotatable relative to the holding member about the rotation axis at a lower position of the holding member.
A power source and a rotary blade mounting shaft that is rotationally driven by the power of the power source;
A mowing machine, characterized in that the rotary blade for mower according to any one of claims 1 to 13 is attached to the rotary blade mounting shaft.