Cord feeding mechanism of bush cutter and bush cutting method

Abstract

To provide a bush cutter capable of pulling out the remaining cord wound on a cord winding bobbin from a cord insertion port by a simple operation.SOLUTION: Provided are a cord feeding mechanism of a bush cutter and a bush cutting method using the same, wherein a case is comprised of a cord winding button, which is biased by a spring and is installed in the space surrounded by the top and bottom lids of the case body, with a part of it protruding below the bottom lid and movable up and down along its axis, and a cord winding bobbin, which is fixed to the axial end of the cord winding button and has cord distribution guide means, and engagement means for stopping or releasing the rotation of the cord winding bobbin is provided on the lower surface of the cord winding bobbin and on the upper surface of the lower cover, so that each time the bottom of the cord winding button touches the ground, the cord wound on the cord winding bobbin is pulled out from the cord insertion guide.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rotary cutter for a lawn mower that is rotationally driven via a drive shaft, more specifically, when the length of the cord wound around the cord winding bobbin is consumed and shortened from the cord insertion port, the rotary cutter can be removed from the drive shaft or disassembled, and the remaining cord wound around the cord winding bobbin can be easily pulled out from the cord insertion port by a simple operation. The present invention relates to a cord feeding mechanism for a lawn mower and a lawn mowing method.

Background Art

[0002] A reel that stores a cord for mowing grass and feeds the cord while rotating intermittently, a case body that stores the reel, a cover that covers the case body, and a pressing body that protrudes from the case and is movable in the axial direction by pressing and rotates the reel integrally. In a rotary cutter for a lawn mower comprising an elastic body that is axially incorporated between the cover and the reel and elastically supports the cover and the reel, the reel is configured to move in the axial direction as the pressing body rotates and come into and out of contact with the pressing body, and a structure is disclosed in which the cord is inserted into the gap between the pressing body and the reel generated by the axial movement of the reel and wound around the reel in a clamped state. (See Patent Document 1). (See Patent Document 1.)

[0003] Further, a pressing portion biased and protruded by a spring is integrally formed with a reel member divided into two-layer cord winding portions via an intermediate partition portion below the exterior case, and an engagement mechanism that transmits or releases the rotation of the exterior case, and when the pressing portion rises, the reel member is rotated in the direction of loosening the cord. It is equipped with a walking mechanism, and a cord insertion hole is provided facing the outer periphery of the exterior case. Near the cord insertion hole in the middle partition part, a cord guide hole having a distribution guiding means is provided substantially linearly in the diameter direction of the pressing part. A cord pay-out device for a lawn mower and a cord routing method in the cord pay-out device are disclosed (see Patent Document 2). close to the cord insertion hole, and a cord guide hole having a distribution guiding means is provided substantially linearly in the diameter direction of the pressing part The cord pay-out device for a lawn mower and the cord routing method in the cord pay-out device are shown (see Patent Document 2). shown (see Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The invention described in Patent Document 1 is a rotary cutter of a type in which the cutter head part is attached to the rotary drive shaft without removing the case and the cover, the cord is inserted from the cord guides on both sides, and the cord is wound around the reel by turning a pressing body that integrally rotates the reel. It can not only wind the cord simply and quickly, but also continue the operation without the remaining cord wound around the reel coming out of the reel even if the cord wears and the cord wound around the reel is consumed and shortened. It aims to provide a rotary cutter for a lawn mower The cord attachment work according to the above invention rotates the reel that rotates integrally with the pressing body in the direction opposite to the cord pay-out direction, moves the reel in the axial direction against the spring The cord attachment work according to the above invention rotates the reel that rotates integrally with the pressing body in the direction opposite to the cord pay-out direction, moves the reel in the axial direction against the spring, and winds the cord around the reel. It aims to provide a rotary cutter for a lawn mower that can not only wind the cord simply and quickly, but also continue the operation without the remaining cord wound around the reel coming out of the reel even if the cord wears and the cord wound around the reel is consumed and shortened and even if the cord that is wound around the reel wears and the cord wound around the reel is consumed and shortened, the remaining cord wound around the reel can continue the operation without coming out of the reel and provides a rotary cutter for a lawn mower for the purpose of

[0006] The cord attachment work according to the above invention rotates the reel that rotates integrally with the pressing body in the direction opposite to the cord pay-out direction, moves the reel in the axial direction against the spring, and winds the cord around the reel. It aims to provide a rotary cutter for a lawn mower that can not only wind the cord simply and quickly, but also continue the operation without the remaining cord wound around the reel coming out of the reel even if the cord wears and the cord wound around the reel is consumed and shortened A gap is created between the plate of the pressing body and the reel, and then the tip of the cord is inserted into the gap inward from the plate. While turning the pressing body further in this state, the gap is eliminated. At the same time, the reel moves toward the case side due to the biasing force of the spring, and the cord is clamped by the plate. However, since the nylon cord used in the mower has flexibility and resilience, it is not easy to insert both tip portions of the nylon cord inward of the gap between the plate of the pressing body and the reel, and while holding the nylon cord with one hand, turn the pressing body with the other hand to fix the tip of the nylon cord to the reel. The invention described in Patent Document 2 is a cord payout device for a mower, which includes a reel member divided into upper and lower cord winding portions where the cord can be wound in two layers via a partition portion, an engagement mechanism for transmitting or releasing the rotation of the outer case to the reel member, a stepping mechanism for rotating the reel member in the cord loosening direction when the pressing portion rises, and cord insertion holes provided on the outer periphery of the outer case facing in the diameter direction, and a cord guide hole provided in the partition portion substantially linearly over the diameter of the pressing portion in a direction crossing the rotation axis of the outer case and close to the cord insertion hole. The procedure for winding the cord around the cord reel member is as follows: First, align the cord insertion hole provided on the outer periphery of the outer case facing in the diameter direction with the cord guide hole formed in the partition portion between the upper and lower flanges of the reel member, insert one end of the cord through one of the cord insertion holes, and then

[0007] However, since the nylon cord used in the mower has flexibility and resilience, it is not easy to insert both tip portions of the nylon cord inward of the gap between the plate of the pressing body and the reel, and while holding the nylon cord with one hand, turn the pressing body with the other hand to fix the tip of the nylon cord to the reel. insert the tip of the nylon cord inward of the gap between the plate of the pressing body and the reel, and while holding the nylon cord with one hand, turn the pressing body with the other hand to fix the tip of the nylon cord to the reel. However, since the nylon cord used in the mower has flexibility and resilience, it is not easy to insert both tip portions of the nylon cord inward of the gap between the plate of the pressing body and the reel, and while holding the nylon cord with one hand, turn the pressing body with the other hand to fix the tip of the nylon cord to the reel. However, since the nylon cord used in the mower has flexibility and resilience, it is not easy to insert both tip portions of the nylon cord inward of the gap between the plate of the pressing body and the reel, and while holding the nylon cord with one hand, turn the pressing body with the other hand to fix the tip of the nylon cord to the reel.

[0008] The invention described in Patent Document 2 is a cord payout device for a mower, which includes a reel member divided into upper and lower cord winding portions where the cord can be wound in two layers via a partition portion, an engagement mechanism for transmitting or releasing the rotation of the outer case to the reel member, a stepping mechanism for rotating the reel member in the cord loosening direction when the pressing portion rises, and cord insertion holes provided on the outer periphery of the outer case facing in the diameter direction, and a cord guide hole provided in the partition portion substantially linearly over the diameter of the pressing portion in a direction crossing the rotation axis of the outer case and close to the cord insertion hole. The reel member is divided into upper and lower cord winding portions where the cord can be wound in two layers via a partition portion, and an engagement mechanism is provided between the outer case and the reel member to transmit or release the rotation of the outer case. When the pressing portion rises, a stepping mechanism rotates the reel member in the cord loosening direction. Cord insertion holes are provided on the outer periphery of the outer case facing in the diameter direction, and a cord guide hole is provided in the partition portion substantially linearly over the diameter of the pressing portion in a direction crossing the rotation axis of the outer case and close to the cord insertion hole. The procedure for winding the cord around the cord reel member is as follows: First, align the cord insertion hole provided on the outer periphery of the outer case facing in the diameter direction with the cord guide hole formed in the partition portion between the upper and lower flanges of the reel member, insert one end of the cord through one of the cord insertion holes, and then insert the tip of the cord into the cord guide hole through the other cord insertion hole, and then wind the cord around the upper and lower cord winding portions of the reel member. The invention described in Patent Document 2 is a cord payout device for a mower, which includes a reel member divided into upper and lower cord winding portions where the cord can be wound in two layers via a partition portion, an engagement mechanism for transmitting or releasing the rotation of the outer case to the reel member, a stepping mechanism for rotating the reel member in the cord loosening direction when the pressing portion rises, and cord insertion holes provided on the outer periphery of the outer case facing in the diameter direction, and a cord guide hole provided in the partition portion substantially linearly over the diameter of the pressing portion in a direction crossing the rotation axis of the outer case and close to the cord insertion hole. The reel member is divided into upper and lower cord winding portions where the cord can be wound in two layers via a partition portion, and an engagement mechanism is provided between the outer case and the reel member to transmit or release the rotation of the outer case. When the pressing portion rises, a stepping mechanism rotates the reel member in the cord loosening direction. Cord insertion holes are provided on the outer periphery of the outer case facing in the diameter direction, and a cord guide hole is provided in the partition portion substantially linearly over the diameter of the pressing portion in a direction crossing the rotation axis of the outer case and close to the cord insertion hole. The invention described in Patent Document 2 is a cord payout device for a mower, which includes a reel member divided into upper and lower cord winding portions where the cord can be wound in two layers via a partition portion, an engagement mechanism for transmitting or releasing the rotation of the outer case to the reel member, a stepping mechanism for rotating the reel member in the cord loosening direction when the pressing portion rises, and cord insertion holes provided on the outer periphery of the outer case facing in the diameter direction, and a cord guide hole provided in the partition portion substantially linearly over the diameter of the pressing portion in a direction crossing the rotation axis of the outer case and close to the cord insertion hole.

[0009] The procedure for winding the cord around the cord reel member is as follows: First, align the cord insertion hole provided on the outer periphery of the outer case facing in the diameter direction with the cord guide hole formed in the partition portion between the upper and lower flanges of the reel member, insert one end of the cord through one of the cord insertion holes, and then insert the tip of the cord into the cord guide hole through the other cord insertion hole, and then wind the cord around the upper and lower cord winding portions of the reel member. align the cord insertion hole provided on the outer periphery of the outer case facing in the diameter direction with the cord guide hole formed in the partition portion between the upper and lower flanges of the reel member, insert one end of the cord through one of the cord insertion holes, and then It is inserted substantially linearly across the diameter of the pressing part through the guide hole, and the other cord guide After pulling it out from the inner hole and the cord insertion hole, align both ends of the cord so that the center of the cord is located at the center of the reel member, and the pressing part is rotated to the winding side of the cord.

[0010] However, in this wiring method, an adjustment operation is necessary to make the drawn lengths of the cords inserted into the cord insertion holes provided to oppose the reel member substantially the same. Also, an engagement mechanism provided between the exterior case and the reel member for transmitting or releasing the rotation of the exterior case, and the structure of the stepping mechanism for rotating the reel member in the direction of cord loosening when the pressing part rises is complicated, resulting in high costs.

Means for Solving the Problems

[0011] The present invention has been made to solve the above problems. A first invention is a flat dish-shaped upper lid having an arc-shaped hole that engages with a lower lid formed opposite to each other on an upper surface that is attached to a drive shaft and rotates, and a standing wall portion provided with an opening for sandwiching a cord insertion guide facing each other on an outer peripheral edge, and a lower lid that is detachably fitted and attached to the upper lid, has an engagement piece with the upper lid formed on an outer peripheral edge, and has a standing wall portion provided with an opening for sandwiching a cord insertion guide facing each other, and a cord winding button is provided with a through hole that can move up and down at the center, and a case body is composed of a bottom lid that is detachably attached to the lower part of the lower lid and has a through hole that can move the cord winding button up and down at the center. A space surrounded by the upper lid and the lower lid of the case body is internally installed by being biased by a spring ring, and a part of it protrudes below the lower lid and the bottom lid, and the shaft A cord winding button that can move up and down in the center direction, and is fixed to the upper shaft end of the cord winding button It is composed of a cord winding bobbin having cord distribution guiding means.

[0012] On the lower surface of the cord winding bobbin and the upper surface of the lower cover, engaging means for stopping or releasing the rotation of the cord winding bobbin are provided, and when the bottom surface of the cord winding button touches the ground To a degree, the cord winding button moves to the upper cover side of the main body to temporarily stop the rotation of the cord winding bobbin, and due to the centrifugal force when the bottom surface of the cord winding button leaves the ground and rotates The cord wound around the cord winding bobbin is configured to be pulled out from the cord insertion guide. It is a cord payout mechanism for a lawn mower, characterized in that.

[0013] In the second invention, the cord winding button is formed with a polygonal grip portion and a hollow bottomed quadrangular prism axis erected from the grip portion integrally. A hollow quadrangular prism axis formed on the cord winding bobbin is fitted to the axis, and the cord winding button and the cord winding Bobbin are integrally assembled. In the axis of the hollow quadrangular prism of the cord winding bobbin, through holes are provided from the four inner wall sides to the four outer wall sides. One of the opposing through holes communicates with the upper stage insertion hole of the distribution guiding means formed on the cord winding bobbin, and the other communicates with the lower stage insertion hole of the distribution guiding means formed on the cord winding bobbin. The cords are separated into upper and lower stages and wound around the cord winding bobbin, which is the cord payout mechanism according to claim 1, characterized in that.

[0014] In the third invention, the distribution guiding means of the cord winding bobbin is the upper and lower surfaces of the cord winding bobbin ​​​​​​​​​​In the middle of the flange to be formed, which has the same diameter as or slightly smaller diameter than the flange and is formed in the radial direction, two pairs of cord insertion holes are provided on the circumference against the outer peripheral surface of the middle partition portion formed in the radial direction, penetrating from the outer peripheral surface of the middle partition portion through the axis of the cord winding bobbin. One of the opposing pair of insertion holes is an upper-stage insertion hole, and the other is a lower-stage insertion hole, and they are separated into the upper stage and the lower stage and wound around the cord winding bobbin respectively. It is a cord payout mechanism of the lawn mower according to claim 1 or 2, characterized in that. Against the outer peripheral surface of the middle partition portion which has the same diameter as or slightly smaller diameter than the flange and is formed in the radial direction in the middle of the flange to be formed, two pairs of cord insertion holes are provided on the circumference, penetrating from the outer peripheral surface of the middle partition portion through the axis of the cord winding bobbin. One of the opposing pair of insertion holes is an upper-stage insertion hole, and the other is a lower-stage insertion hole, and they are separated into the upper stage and the lower stage and wound around the cord winding bobbin respectively. It is a cord payout mechanism of the lawn mower according to claim 1 or 2, characterized in that. It is separated into the upper stage and the lower stage and wound around the cord winding bobbin respectively. It is a cord payout mechanism of the lawn mower according to claim 1 or 2, characterized in that.

[0015] In the fourth invention, on the inner surface of the hollow bottomed quadrangular prism erected from the gripping portion of the cord winding button, gripping bodies for gripping both tip ends of the cord are provided opposingly. It is a cord payout mechanism of the lawn mower according to claim 1 or 2, characterized in that. On the inner surface of the hollow bottomed quadrangular prism erected from the gripping portion of the cord winding button, gripping bodies for gripping both tip ends of the cord are provided opposingly. It is a cord payout mechanism of the lawn mower according to claim 1 or 2, characterized in that.

[0016] In the fifth invention, an engagement mechanism is formed on the bottom surface of the cord winding bobbin and the upper surface of the lower lid. A substantially triangular protrusion with a substantially triangular cross section provided on the bottom surface of the cord winding bobbin and a trapezoidal protrusion provided on the upper surface of the lower lid so as to face the protrusion are engaged in a state pressed by the spring and rotate integrally. When the lower part of the cord winding button is brought into contact with the ground, the cord winding button rises and the engagement between the substantially triangular protrusion provided on the bottom surface of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid facing it is released and becomes a disengaged state, and the rotation of the reel stops. When the cord winding button is separated from the ground, the cord winding bobbin descends, and the substantially triangular protrusion of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid are in an engaged state. It is a cord payout mechanism of the lawn mower according to claim 1 or 2, characterized in that. In the fifth invention, an engagement mechanism is formed on the bottom surface of the cord winding bobbin and the upper surface of the lower lid. A substantially triangular protrusion with a substantially triangular cross section provided on the bottom surface of the cord winding bobbin and a trapezoidal protrusion provided on the upper surface of the lower lid so as to face the protrusion are engaged in a state pressed by the spring and rotate integrally. When the lower part of the cord winding button is brought into contact with the ground, the cord winding button rises and the engagement between the substantially triangular protrusion provided on the bottom surface of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid facing it is released and becomes a disengaged state, and the rotation of the reel stops. When the lower part of the cord winding button is brought into contact with the ground, the cord winding button rises and the engagement between the substantially triangular protrusion provided on the bottom surface of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid facing it is released and becomes a disengaged state, and the rotation of the reel stops. When the lower part of the cord winding button is brought into contact with the ground, the cord winding button rises and the engagement between the substantially triangular protrusion provided on the bottom surface of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid facing it is released and becomes a disengaged state, and the rotation of the reel stops. When the lower part of the cord winding button is brought into contact with the ground, the cord winding button rises and the engagement between the substantially triangular protrusion provided on the bottom surface of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid facing it is released and becomes a disengaged state, and the rotation of the reel stops. When the lower part of the cord winding button is brought into contact with the ground, the cord winding button rises and the engagement between the substantially triangular protrusion provided on the bottom surface of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid facing it is released and becomes a disengaged state, and the rotation of the reel stops. When the cord winding button is separated from the ground, the cord winding bobbin descends, and the substantially triangular protrusion of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid are in an engaged state. When the cord winding button is separated from the ground, the cord winding bobbin descends, and the substantially triangular protrusion of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid are in an engaged state. It is a cord payout mechanism of the lawn mower according to claim 1 or 2, characterized in that.

[0017] The sixth invention is a flat dish-shaped upper lid that is attached to a drive shaft and rotates, with an arc-shaped hole formed on the upper surface for engaging with a lower lid, and has a vertical wall portion provided with openings facing each other for sandwiching a cord insertion guide on the outer peripheral edge, a flat dish-shaped lower lid that is detachably fitted and attached to the upper lid, has an engaging piece with the upper lid formed on the outer peripheral edge, has a vertical wall portion provided with openings facing each other for sandwiching a cord insertion guide, and has a loose insertion hole through which a cord winding button can move up and down in the central portion, and a bottom lid that is detachably attached to the lower portion of the lower lid and has a loose insertion hole through which a cord winding button can move up and down in the central portion. In the cord payout mechanism of a lawn mower composed of a case body, after aligning a pair of opposing cord insertion guides sandwiched between the upper lid and the lower lid and through holes provided in a pair of distribution guide means formed opposite to the cord winding bobbin, respectively, insert both tip ends of an arbitrarily long elongated cord into the holes of the cord insertion guides, respectively, attach both tip ends of the cord to the cord holding body provided on the axis of the cord winding button, and then, while rotating the cord winding button, wind the cord around the cord winding bobbin until a predetermined cord payout length is exposed from the cord insertion guides. After that, cut the central portion of the exposed cord. This completes the winding of the cord around the cord winding bobbin and enables the lawn mowing operation. During the lawn mowing operation, when the payout length of the cord becomes short, each time the bottom surface of the cord winding button is grounded, the cord winding button moves toward the upper lid side of the main body, the rotation of the cord winding bobbin temporarily stops, and when the bottom surface of the cord winding button leaves the ground and rotates, ​​​​​​​​​​Due to the centrifugal force, the cord wound around the cord winding bobbin is pulled out from the cord insertion guide. This is a grass cutting method of a cord feeding mechanism for a lawn mower, characterized in that the cord wound around the cord winding bobbin is pulled out from the cord insertion guide.

Advantages of the Invention

[0018] According to the present invention, engaging means for stopping or releasing the rotation of the cord winding bobbin are provided on the lower surface of the cord winding bobbin and the upper surface of the lower cover. Therefore, every time the lower surface of the cord winding button touches the ground, the rotation of the cord winding bobbin stops, and due to the centrifugal force when the bottom surface of the cord winding button rotates away from the ground, the cord wound around the cord winding bobbin is pulled out from the cord insertion guide. As a result, even if the cord becomes shorter due to wear during the grass cutting operation, it is possible to continue the grass cutting operation without stopping the grass cutting operation, simply by grounding the bottom surface of the cord winding button.

[0019] According to the present invention, the cord distribution guiding means of the cord winding bobbin is provided with a cord insertion hole penetrating through the axis from the outer peripheral surface of the middle partition portion formed in the radial direction, facing the outer peripheral surface of the middle partition portion formed in the middle of the flange forming the upper and lower surfaces of the cord winding bobbin. Further, one of the pair of opposing insertion holes is an upper-stage insertion hole and the other is a lower-stage insertion hole, and the cord is separated into upper and lower stages and wound around the cord winding bobbin, so that there is no need for the labor of manually distributing and winding it up and down, and it can be easily wound.

[0020] According to the present invention, the insertion hole is drilled through the central axis hole of the cord winding bobbin and the hollow quadrilateral shaft of the cord winding button, and the tip of the cord is located in the hollow quadrilateral shaft. ​​​​​​​​​​​​​Since a cord holding body for preventing the cord from falling out of the hollow quadrilateral shaft is provided, during the mowing operation the cord will not fall out, and the danger to the body and the like can be prevented in advance.

[0021] According to the present invention, inside the hollow and bottomed quadrangular prism erected from the grip portion of the cord winding button on the side surface, holding bodies for holding both tip ends of the cord are provided oppositely, so that the tip end of the cord can be prevented from coming out of the cord winding bobbin.

[0022] According to the present invention, an engaging mechanism is formed on the bottom surface of the cord winding bobbin and the upper surface of the lower lid so that a substantially triangular protrusion provided on the bottom surface of the cord winding bobbin and a trapezoidal protrusion provided on the upper surface of the lower lid facing the protrusion are engaged with each other while being pressed by the spring and rotate integrally. When the lower part of the cord winding button contacts the ground, the cord winding button rises, and the engagement between the triangular protrusion provided on the bottom surface of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid facing the protrusion is released, resulting in a non-engaged state and the rotation of the reel stops. When the cord winding button is separated from the ground, the cord winding bobbin descends, and the triangular protrusion of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid are engaged with each other. Even if the pulling length of the cord becomes shorter, the operation of temporarily stopping the mowing operation and pulling out the cord is no longer required, and an efficient mowing operation becomes possible. When the cord winding button is separated from the ground, the cord winding bobbin descends, and the triangular protrusion of the cord winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid are engaged with each other, so that even if the pulling length of the cord becomes shorter, the operation of temporarily stopping the mowing operation and pulling out the cord is no longer required, and an efficient mowing operation becomes possible. bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid are engaged with each other, so that even if the pulling length of the cord becomes shorter, the operation of temporarily stopping the mowing operation and pulling out the cord is no longer required, and an efficient mowing operation becomes possible. no longer required, and an efficient mowing operation becomes possible.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2 the cord payout mechanism 1 of the grass cutter is rotatably attached to the tip of the drive shaft S by a nut N (shown by a broken line), and is composed of an upper lid 2, a lower lid 3, a bottom lid 4, a cord winding bobbin 5, a cord winding button 6, a spring 7, and a cord insertion guide 8. Further, the constituent members excluding the aforementioned spring 7 and cord insertion guide 8 are molded from synthetic resin.

[0025] ​​ In FIGS. 1 and 2, the upper lid 2 is attached to the drive shaft S by a nut N and rotates together with the drive shaft S. The upper lid 2 has a drive shaft insertion hole 21 formed at the center, and a pair of arc-shaped through holes 24 that attach to a pair of standing wall portions 31 erected from the circumferential portion of the lower lid 3 are provided at the outer periphery. Further, both peripheral portions through which the arc-shaped through holes 24 penetrate bulge at the outer peripheral portion, and the upper surface portion of the upper lid 2 is formed in an elliptical shape.

[0026] In FIG. 3, the notch 26 for gripping the cord insertion guide 8 is formed by cutting a part of the two-layer standing wall portions 23a and 23b provided opposite to each other, and is formed in a substantially flat dish shape as a whole. Note that the portion where the drive shaft insertion hole 21 is provided is integrally molded only with synthetic resin, but a flange-shaped insert (not shown) made of metal or non-ferrous metal may be arranged and integrally molded for strength retention.

[0027] On the outer peripheral edge of the major axis of the elliptical dish-shaped surface of the upper lid 2, two arc-shaped through holes 24 are provided opposite to each other for detachably inserting the engaging pieces 33 and 33 provided on the lower lid 3. Further, two-layer standing wall portions 23a and 23b are erected on the outer peripheral edge of the upper lid 2, and at a position rotated 90° from the arc-shaped through holes 24, two notches 26 for gripping the cord insertion guide 8 that are detachably provided diametrically opposite on the circumference of the standing wall portions 23a and 23b are provided. Furthermore, eight reinforcing walls 27 for reinforcing the holding cylinder 25 (not shown) that holds the spring 7 disposed on the outer periphery of the drive shaft insertion hole 21 are radially provided on the inner surface of the upper lid 2.

[0028] The code insertion guide 8 is die-cast using an aluminum alloy, and from the holes 81 formed in its central portion, the tip ends on both sides of the code C are respectively inserted into the code entrance and exit 56 of the code winding bobbin 5 and wound around the code winding bobbin 5.

[0029] In FIG. 4, the lower lid 3 is formed in a substantially flat dish shape having a standing wall portion 31 erected on its outer peripheral edge. Then, the standing wall portion 31 erected on the outer peripheral edge of the lower lid 3 is detachably fitted and attached to the gap between the two-layer standing wall portions 23a and 23b provided on the upper lid 2. At the center of the dish-shaped surface of the lower lid 3, an insertion hole 32 for inserting the grip portion and pressing portion 61 of the code winding button 6 described later is provided. At a position opposing the arc-shaped through hole 24 provided in the upper lid 2 outside the standing wall portion 31, two engaging pieces 33 having a fishhook-shaped tip are erected and are detachably inserted into the arc-shaped through hole 24. The engaging piece 33 has flexibility and can be pinched with a finger so as to press the outer peripheral surface, and can be attached to and detached from the upper lid 2.

[0030] On the circumferential portion of the periphery of the insertion hole 32 penetrating the lower lid 3, eight trapezoidal protrusions 34 are erected at equal intervals on the circumference in a side view, and eight protrusions 57 that are substantially triangular in side view and are erected at equal intervals on the circumference of the lower surface of the code winding bobbin 5 described later contact or separate from each other, thereby constituting an engaging means capable of stopping or releasing the rotation of the code winding bobbin 5.

[0031] At a position rotated 90° with respect to each engaging piece 33 of the lower lid 3, a notch 35 for placing the code insertion guide 8 is provided. Further, on the circumferential edge portion of the lower lid 3, from the upper lid 2 An edge 36 is provided to facilitate pinching by fingers when removing.

[0032] In FIG. 5, the bottom cover 4 is formed in a substantially flat dish shape. A through hole 41 is provided at the center thereof for inserting the gripping and pressing portion 61 of the cord winding button 6 so as to be vertically movable. Near the circumferential edge there are provided four engaging pieces 42 having a tip portion formed like a fishing hook for detachably engaging with the lower cover 3. These engaging pieces 42 are flexible and can be pinched by fingers to press the outer peripheral surface thereof and attached to and removed from the lower cover 3.

[0033] In FIGS. 6 and 7, a square central hole 54 of the cord winding bobbin 5 has a square axial center 63 of the cord winding button 6 that can move up and down in the axial direction with respect to the insertion hole 32 of the lower cover 3 and the through hole 41 of the bottom cover 4, and is fitted therein. The cord winding bobbin 5 and the cord winding button 6 rotate in an integrated state.

[0034] Also, engaging means for stopping or releasing the rotation of the cord winding bobbin 5 are provided on the lower surface of the cord winding bobbin 5 and the upper surface of the lower cover 3. On the lower surface of the lower flange 52 of the cord winding bobbin 5, eight protrusions 57 having a substantially triangular cross section are provided radially.

[0035] In the gap between the central hole 54 of the cord winding bobbin 5 and the central shaft hole 64 of the cord winding button 6, as shown in FIG. 2, a spring (coil spring) 7 for pressing and biasing the cord winding button 6 toward the ground side is disposed. Thereby, the cord winding bobbin 5 and the cord winding button 6 are rotatable and vertically movable in the axial direction with respect to the upper cover 2 connected to the drive shaft S, the lower cover 3 connected to the upper cover 2, and the bottom cover 4. ​

[0036] The configuration of the code winding bobbin 5 is such that an intermediate partition portion 53 having substantially the same diameter or slightly smaller diameter than the upper flange 51 and the lower flange 52 is formed in the radial direction between the upper flange 51 and the lower flange 52. Thus, the code C is wound through the intermediate partition portion 53 and is divided into upper and lower two-layer code winding portions 55a and 55b. The upper flange 51 and the lower flange 52 are formed with an intermediate partition portion 53 having substantially the same diameter or slightly smaller diameter, and the code C is wound through the intermediate partition portion 53 and is divided into upper and lower two-layer code winding portions 55a and 55b. By forming the intermediate partition portion 53 in the radial direction, the code C is wound through the intermediate partition portion 53 and is divided into upper and lower two-layer code winding portions 55a and 55b. The structure is such that the code C is wound around the upper and lower code winding portions 55a and 55b through the intermediate partition portion 53.

[0037] In FIGS. 8(a) and 8(b), as the code C distribution guiding means, on the outer peripheral side surface of the intermediate partition portion 53, two pairs (four in total on the circumference) of released slit-shaped code inlets and outlets 56a and 56b are formed facing the rotation axis of the code winding bobbin 5, and the code C is wound around the upper and lower code winding portions 55a and 55b through the slit-shaped inlets and outlets 56a and 56b. On the outer peripheral side surface of the intermediate partition portion 53, two pairs (four in total on the circumference) of released slit-shaped code inlets and outlets 56a and 56b are formed facing the rotation axis of the code winding bobbin 5, and the code C is wound around the upper and lower code winding portions 55a and 55b through the slit-shaped inlets and outlets 56a and 56b. One of the pair of slit-shaped portions is a slit opened toward the rear side with respect to the rotation direction of the code winding bobbin, and is connected to the upper winding portion 55a as shown in FIG. 8(a). The other is a slit opened toward the rear side with respect to the rotation direction of the code winding bobbin as shown in FIG. 8(b), and is connected to the lower winding portion 55b.

[0038] One of the pair of slit-shaped portions is a slit opened toward the rear side with respect to the rotation direction of the code winding bobbin, and is connected to the upper winding portion 55a as shown in FIG. 8(a). The other is a slit opened toward the rear side with respect to the rotation direction of the code winding bobbin as shown in FIG. 8(b), and is connected to the lower winding portion 55b. The other is a slit opened toward the rear side with respect to the rotation direction of the code winding bobbin as shown in FIG. 8(b), and is connected to the lower winding portion 55b. The other is a slit opened toward the rear side with respect to the rotation direction of the code winding bobbin as shown in FIG. 8(b), and is connected to the lower winding portion 55b.

[0039] Also, as shown in FIG. 8(c), at positions rotated 90° respectively from the released slit-shaped code inlets and outlets 56a and 56b, slit-shaped code inlets and outlets 58a and 58b similar to the slit-shaped code inlets and outlets 56a and 56b are formed. Therefore, during use, the code can be used through the slit-shaped code inlets and outlets 56a and 56b where the codes are linearly opposed, or the slit-shaped code inlets and outlets 58a and 58b can be selected for use. At positions rotated 90° respectively from the released slit-shaped code inlets and outlets 56a and 56b, slit-shaped code inlets and outlets 58a and 58b similar to the slit-shaped code inlets and outlets 56a and 56b are formed. Therefore, during use, the code can be used through the slit-shaped code inlets and outlets 56a and 56b where the codes are linearly opposed, or the slit-shaped code inlets and outlets 58a and 58b can be selected for use. The code can be used through the slit-shaped code inlets and outlets 56a and 56b where the codes are linearly opposed, or the slit-shaped code inlets and outlets 58a and 58b can be selected for use. The code can be used through the slit-shaped code inlets and outlets 56a and 56b where the codes are linearly opposed, or the slit-shaped code inlets and outlets 58a and 58b can be selected for use.

[0040] In FIGS. 9 to 11, the cord winding button 6 has a substantially pentagonal grip portion and pressing portion 61 and a disk 62, and a hollow square cylinder shaft core 63 erected on the upper portion of the disk 62. The grip portion and pressing portion 61 is used when winding the cord C around the cord winding bobbin 5 and also functions as a pressing portion when pulling out the cord C from the cord winding bobbin 5.

[0041] On the upper side surface of the shaft core 63 of the hollow square cylinder, four cord insertion holes 67 are provided which communicate with the cord inlet / outlet holes 56a and 56b, 58a and 58b provided in the cord winding bobbin 5 respectively. Therefore, the inlets / outlets for using the cord C simultaneously are combinations of the cord inlet / outlet holes 56a and 56b or 58a and 58b where the cords C oppose each other in a straight line.

[0042] As shown in FIG. 12, in the internal space forming the upper four side surfaces of the shaft core 63, resin holding bodies 65 for holding both end portions of the cord C are fitted. The holding body 65 is a hexahedron made of synthetic resin and is molded with flexible PP (polypropylene). Also, four through holes 66 having a hole diameter slightly smaller than the diameter of the cord C and penetrating from the four side surfaces of the hexahedron to the bottom surface are provided independently.

[0043] By inserting both end portions of the cord C into a pair of opposing through holes 56a, 56b or 58a, 58b of the holding body 65 and passing through the through holes 66 of the holding body 65, both end portions of the cord C can be prevented from dropping out of the cord winding bobbin 5 during the mowing operation using the cord pay-out device 1 of the mower according to the present application.

[0044] ​​​​​​ FIG. 13 is a schematic explanatory view of the engagement mechanism, and the arrows indicate the rotation directions. (a) shows the engaged state, and (b) shows the released state. In FIG. 13(a), an engagement mechanism is formed on the bottom surface of the cord winding bobbin 5 and the upper surface of the lower cover 3. A substantially triangular protrusion 57 with a substantially triangular cross-section provided on the bottom surface of the cord winding bobbin 5 and a trapezoidal protrusion 34 with a trapezoidal cross-section provided on the upper surface of the lower cover 3 so as to face the substantially triangular protrusion 57 are engaged with each other under the pressure of the spring 7 and rotate integrally, and the mowing operation is performed in this engaged state. The bottom surface of the cord winding bobbin 5 and the upper surface of the lower cover 3 are formed with an engagement mechanism. A substantially triangular protrusion 57 provided on the bottom surface of the cord winding bobbin 5 and having a substantially triangular cross-section and a trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 so as to face the substantially triangular protrusion 57 are engaged with each other under the pressure of the spring 7 and rotate integrally, and the mowing operation is performed in this engaged state. A substantially triangular protrusion 57 provided on the bottom surface of the cord winding bobbin 5 and having a substantially triangular cross-section and a trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 so as to face the substantially triangular protrusion 57 are engaged with each other under the pressure of the spring 7 and rotate integrally, and the mowing operation is performed in this engaged state. A substantially triangular protrusion 57 provided on the bottom surface of the cord winding bobbin 5 and having a substantially triangular cross-section and a trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 so as to face the substantially triangular protrusion 57 are engaged with each other under the pressure of the spring 7 and rotate integrally, and the mowing operation is performed in this engaged state.

[0045] FIG. 13(b) shows a state where the lower part of the cord winding button 6 is in contact with the ground. When the cord winding button 6 rises, the substantially triangular protrusion 57 provided on the bottom surface of the cord winding bobbin 5 rises, and the engagement with the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 facing the substantially triangular protrusion 57 is released, resulting in a non-engaged state, and the rotation of the cord winding bobbin 5 stops. Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5. Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5. Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5.

[0046] Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5. Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5. Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5. Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5. Next, when the cord winding button 6 is separated from the ground, the cord winding bobbin 5 descends due to the pressing force of the spring 7, and the substantially triangular protrusion 57 of the cord winding bobbin 5 and the trapezoidal protrusion 34 provided on the upper surface of the lower cover 3 return to the engaged state, returning to the state shown in FIG. 13(a). When the cord winding bobbin 5 starts to rotate, due to the centrifugal force, the cord C is pulled out from the cord winding bobbin 5.

[0047] The reason for forming the substantially triangular protrusion 57 of the cord winding bobbin 5 as an arc instead of a triangle is to reduce the impact generated when the cord C is wound around the cord winding bobbin 5 and to reduce the winding force when the cord C is wound around the cord winding bobbin 5 with fingers. The reason for forming the substantially triangular protrusion 57 of the cord winding bobbin 5 as an arc instead of a triangle is to reduce the impact generated when the cord C is wound around the cord winding bobbin 5 and to reduce the winding force when the cord C is wound around the cord winding bobbin 5 with fingers. The reason for forming the substantially triangular protrusion 57 of the cord winding bobbin 5 as an arc instead of a triangle is to reduce the impact generated when the cord C is wound around the cord winding bobbin 5 and to reduce the winding force when the cord C is wound around the cord winding bobbin 5 with fingers.

[0048] The embodiment of the cord payout mechanism 1 of the lawn mower of the present invention is configured as described above. When attaching the cord C, it is desirable to perform the following procedure.

[0049] Prepare a cord (nylon cord) C made of synthetic resin.

[0050] In order to wind the cord C around the cord spool 5, cut the cord C to a necessary length, for example, Preferably 3 to 4 m as the length of one winding, but it may be cut to a desired length according to the situation. It may be.

[0051] When attaching the cord C to the cord payout mechanism 1, first grasp and rotate the gripping and pressing portion 61 of the cord winding button 6 with your fingers without disassembling the cord payout mechanism 1, so as to align the cord insertion hole guide 8 provided diametrically opposite on the outer periphery of the lower lid 3 with the cord inlet / outlet holes 56a, 56b formed in the partition portion 53 of the cord spool 5 rotatably and axially movably provided in the space surrounded by the upper lid 2 and the lower lid 3.

[0052] Next, when one end of the cord C is inserted through one cord insertion hole 8, the cord inlet / outlet holes 56a, 56b corresponding to this cord insertion hole 8 are formed in the middle of the upper and lower flanges 51, 52 in the width direction. Therefore, the cord insertion hole 8 and the cord inlet / outlet holes 56a, 56b are aligned without any gap or step. The tip of the cord C is inserted into the insertion hole 56a of the holding body 65 and fixed so as not to fall off easily.

[0053] The other end of the cord C is inserted into the opposing cord inlet / outlet hole of the holding body 65 by performing the same procedure as above. It is inserted into the cord insertion hole 66 and fixed so as not to easily fall off. Also, thereby Both tip ends of the cord C are held by the cord pay-out mechanism 1 of the lawn mower.

[0054] Next, while holding the side surface of the upper lid 2 with one hand, hold the gripping portion and pressing portion 61 of the cord winding button 6 with the fingers of the other hand and turn it in the rotational direction. Then, the cord C is wound into the cord winding portions 55a, 55b of the cord winding bobbin 5 and is wound up by being drawn into the cord winding bobbin 5.

[0055] As shown in FIG. 8, the cord C is symmetrically provided via the slit-shaped portions 56a, 56b opened in either one of the cord winding portions 55a, 55b of the cord winding bobbin 5. The cord C is divided into the cord winding portions 55a, 55b and the cord C is wound approximately half by half.

[0056] When the length of the cord C exposed from the hole 81 of the cord insertion guide 8 becomes about 20 to 30 cm stop winding the cord winding button 6, and cut the middle portion of the cord C that has not been drawn into the cord winding portions 55a, 55 b with a cutting tool or the like. Thereby, the attachment of the cord C to the cord pay-out mechanism 1 is completed, and it is possible to perform a lawn mowing operation for weeds and the like.

Industrial Applicability

[0057] The cord pay-out mechanism of the lawn mower of the present invention can be widely used as a rotary cutter for a lawn mower that is rotationally driven via a drive shaft.

Explanation of Signs

[0058] 1 Cord pay-out mechanism of lawn mower 2 Upper lid​​​​​ 21 Drive shaft insertion hole 23a, 23b Upright wall part 24 Arc-shaped through hole 25 Holding cylinder 26 Notch 27 Reinforcing wall 3 Lower cover 31 Upright wall part 32 Insertion hole 33 Engagement piece 34 Trapezoidal protrusion 35 Notch 36 Edge 4 Bottom cover 41 Through hole 42 Engagement piece 5 Cord winding bobbin 51 Upper flange 52 Lower flange 53 Middle partition part 54 Center hole 55a, 55b Cord winding part 56a, 56b Released slit-shaped cord inlet / outlet 57 Substantially triangular protrusion 58a, 58b Released slit-shaped cord inlet / outlet 6 Cord winding button 61 Grip part and pressing part 62 Disc 63 Axis 64 Central axis hole 65 Detaining body 66 Through hole 67 Cord insertion hole 7 Spring (coil spring) 8 Cord insertion guide 81 Hole C Cord (nylon cord) N Nut S Drive shaft

Claims

1. A flat dish-shaped upper lid that is attached to a drive shaft and rotates, with arc-shaped holes formed on the upper surface to engage with a lower lid, and vertical wall portions provided opposite to each other with openings for sandwiching a cord insertion guide on the outer peripheral edge; A flat dish-shaped lower lid that is detachably fitted and attached to the upper lid, with engaging pieces with the upper lid formed on the outer peripheral edge, vertical wall portions provided opposite to each other with openings for sandwiching a cord insertion guide, and a through hole provided at the center portion through which a cord winding button can move up and down; A case body is composed of a bottom lid that is detachably attached to the lower part of the lower lid and has a through hole at the center portion through which a cord winding button can move up and down; In the space surrounded by the upper lid and the lower lid of the case body, there is a cord winding bobbin that is urged by a spring and internally installed, with a part protruding below the lower lid and the bottom lid, and is capable of moving up and down in the axial direction, and has a cord distribution guiding means fixed to the upper shaft end of the cord winding button; Engaging means for stopping or releasing the rotation of the cord winding bobbin are provided on the lower surface of the cord winding bobbin and the upper surface of the lower lid; Each time the bottom surface of the cord winding button touches the ground, the cord winding button moves to the upper lid side of the main body and the rotation of the cord winding bobbin temporarily stops. When the bottom surface of the cord winding button leaves the ground and rotates, due to the centrifugal force, the cord wound around the cord winding bobbin is configured to be pulled out from the cord insertion guide. A cord payout mechanism for a lawn mower, characterized by this.

2. The cord winding button is integrally formed with a grip portion formed in a polygon and the axis of a hollow bottomed quadrangular prism standing upright from the grip portion; The axis of a hollow quadrangular prism formed on the cord winding bobbin is fitted to the axis, and the cord winding button and the cord winding bobbin are integrated; In the axis of the hollow quadrangular prism of the cord winding bobbin, through holes are provided from the four inner wall sides to the four outer wall sides. One pair of opposing through holes communicate with the upper stage insertion holes of the distribution guiding means formed on the cord winding bobbin, and the other communicates with the lower stage insertion holes of the distribution guiding means formed on the cord winding bobbin. The cord is separated into the upper stage and the lower stage and wound around the cord winding bobbin respectively. The cord payout mechanism according to Claim 1, characterized by this.

3. The code payout guiding means of the code winding bobbin is provided such that on the outer peripheral surface of a middle partition portion formed in the radial direction with the same diameter as or slightly smaller than the flange forming the upper and lower surfaces of the code winding bobbin, two pairs of code insertion holes are provided on the circumference in opposition, penetrating from the outer peripheral surface of the middle partition portion through the axis of the code winding bobbin. One of a pair of opposing insertion holes is an upper-stage insertion hole and the other is a lower-stage insertion hole, and they are separated into the upper and lower stages and wound around the code winding bobbin, which is a feature of the code payout mechanism of the brush cutter according to claim 1 or 2.

4. On the inner side surface of a hollow bottomed quadrangular prism erected from the gripping portion of the code winding button, gripping bodies for gripping both tip ends of the code are provided in opposition, which is a feature of the code payout mechanism of the brush cutter according to claim 1 or 2.

5. An engagement mechanism is formed on the bottom surface of the code winding bobbin and the upper surface of the lower lid. A triangular protrusion provided on the bottom surface of the code winding bobbin and a trapezoidal protrusion provided on the upper surface of the lower lid facing the protrusion are engaged and rotate integrally while being pressed by the spring. When the lower portion of the code winding button is brought into contact with the ground, the code winding button rises and the engagement of the trapezoidal protrusion provided on the upper surface of the lower lid facing the triangular protrusion provided on the bottom surface of the code winding bobbin is released to become a non-engaged state, and the rotation of the reel stops. When the code winding button is separated from the ground, the code winding bobbin descends, and the triangular protrusion of the code winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower lid are in an engaged state, which is a feature of the code payout mechanism of the brush cutter according to claim 1 or 2.

6. In a code payout mechanism of a brush cutter composed of a case body including a flat dish-shaped upper lid attached to a drive shaft and rotating, having an arc-shaped hole formed on the upper surface for engaging with the lower lid, and having a standing wall portion provided with openings facing each other for sandwiching a code insertion guide at the outer peripheral edge, a flat dish-shaped lower lid detachably fitted and attached to the upper lid, having an engagement piece with the upper lid formed at the outer peripheral edge, and having a standing wall portion provided with openings facing each other for sandwiching the code insertion guide, and having a loose insertion hole through which a code winding button can move up and down provided at the center portion, and a bottom lid detachably attached to the lower portion of the lower lid and having a loose insertion hole through which the code winding button can move up and down provided at the center portion. An engaging mechanism is formed on the bottom surface of the code winding bobbin and the upper surface of the lower cover. A triangular protrusion provided on the bottom surface of the code winding bobbin and a trapezoidal protrusion provided on the upper surface of the lower cover facing the protrusion are engaged with each other in a state pressed by the spring and rotate integrally. When the lower part of the code winding button contacts the ground, the code winding button rises, and the engagement of the trapezoidal protrusion provided on the upper surface of the lower cover facing the triangular protrusion provided on the bottom surface of the code winding bobbin is released and becomes a disengaged state, and the rotation of the reel stops. A method of using a cord payout mechanism of a brush cutter, characterized in that when the code winding button is separated from the ground, the code winding bobbin descends, and the triangular protrusion of the code winding bobbin and the trapezoidal protrusion provided on the upper surface of the lower cover are engaged.

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