JP7159091B2 - Cord holder and work machine - Google Patents

Description

The technology disclosed by this specification relates to a cord holder and a working machine.

Patent Document 1 discloses a cutter cord. The cutter cord is made of nylon-based resin and has a flat cross-sectional shape. According to the cutter cord having such a flat cross-sectional shape, the air resistance when the cutter cord rotates can be reduced, and the energy consumed for rotating the cutter cord can be reduced. In addition, since the wind noise generated when the cutter cord rotates is reduced, the noise can be suppressed.

Japanese Patent Publication No. 2006-506963

In some cases, the cutter cord is wound around a spool, and the necessary length of the cutter cord is pulled out from the spool before use. In this case, as in Patent Document 1, the cutter cord having a flat cross-sectional shape must be wound around the spool so that the longitudinal direction of the cross-section of the cutter cord is substantially parallel to the rotation axis of the spool. However, the cutter cord pulled out from the spool is held so that the longitudinal direction of the cross section of the cutter cord matches the rotation direction of the cutter cord, that is, it is twisted at an angle with respect to the rotation axis of the spool. Otherwise, air resistance increases when the cutter cord rotates, resulting in increased energy consumption and increased noise. This specification provides a technique capable of reducing energy consumption and noise when the cutter cord rotates.

This specification discloses a code holder. The cord holder may include a spool around which the cutter cord is wound, and a case that houses the spool. The cutter cord may be made of a nylon-based resin and may have a flat cross-sectional shape. The cutter cord may be wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool. The case may include an eyelet for feeding the cutter cord drawn from the spool to the outside of the case. The cutter cord may be delivered from the eyelet such that the longitudinal direction of the cross section of the cutter cord is at a twisted angle with respect to the axis of rotation of the spool.

This specification also discloses a work machine. The work machine may include a cord holder and a prime mover that rotates the cord holder. The cord holder may include a spool around which the cutter cord is wound, and a case that houses the spool. The cutter cord may be made of a nylon-based resin and may have a flat cross-sectional shape. The cutter cord may be wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool. The case may include an eyelet for feeding the cutter cord drawn from the spool to the outside of the case. The cutter cord may be delivered from the eyelet such that the longitudinal direction of the cross section of the cutter cord is at a twisted angle with respect to the axis of rotation of the spool.

According to the above configuration, the cutter cord pulled out from the spool and delivered to the outside of the case through the eyelet is held so that the longitudinal direction of the cross section of the cutter cord matches the rotation direction of the cutter cord. By adopting such a configuration, it is possible to reduce the energy consumed for rotating the cutter cord, and to suppress the noise generated when the cutter cord rotates.

1 is a perspective view showing a bush cutter 2 according to an embodiment; FIG. Fig. 3 is a longitudinal sectional view of the front end unit 6 of the bush cutter 2 according to the embodiment; Fig. 3 is a perspective view of a cutter cord 22 of the bush cutter 2 according to the embodiment; Fig. 3 is a cross-sectional view of the cutter cord 22 of the bush cutter 2 according to the embodiment; 4 is a perspective view of the upper case 60 of the cord holder 18 according to the embodiment; FIG. 4 is a perspective view of the lower case 62 of the cord holder 18 according to the embodiment; FIG. 4 is a cross-sectional view showing the structure of eyelets 54, 55 of the cord holder 18 according to the embodiment; FIG. FIG. 5 is a cross-sectional view showing the structure of eyelets 54 and 55 of a cord holder 18 according to a modification;

Below, representative and non-limiting embodiments of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to provide those skilled in the art with details for implementing a preferred embodiment of the invention, and is not intended to limit the scope of the invention. Additionally, the additional features and inventions disclosed below may be used separately from or in conjunction with other features and inventions to provide improved cord holders and implements, methods of making and using the same. be able to.

Moreover, any combination of features and steps disclosed in the following detailed description are not required to practice the invention in its broadest sense, but are specifically intended to illustrate representative embodiments of the invention only. is described. Moreover, various features of the exemplary embodiments described above and below, as well as those set forth in the independent and dependent claims, are described herein in providing additional and useful embodiments of the invention. They do not have to be combined in the exact order given or in the order listed.

All features set forth in the specification and/or claims, apart from the configuration of the features set forth in the examples and/or claims, are limitations on the originally disclosed and claimed subject matter: They are intended to be disclosed separately and independently of each other. Moreover, all numerical ranges and groupings or populations are intended to disclose configurations intermediate therebetween as limitations on the original disclosure as well as the specific subject matter claimed.

In one or more embodiments, the cord holder may comprise a spool around which the cutter cord is wound and a case that houses the spool. The cutter cord may be made of a nylon-based resin and may have a flat cross-sectional shape. The cutter cord may be wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool. The case may include an eyelet for feeding the cutter cord drawn from the spool to the outside of the case. The cutter cord may be delivered from the eyelet such that the longitudinal direction of the cross section of the cutter cord is at a twisted angle with respect to the axis of rotation of the spool.

According to the above configuration, the cutter cord pulled out from the spool and delivered to the outside of the case through the eyelet is held so that the longitudinal direction of the cross section of the cutter cord matches the rotation direction of the cutter cord. By adopting such a configuration, it is possible to reduce the energy consumed for rotating the cutter cord, and to suppress the noise generated when the cutter cord rotates.

In one or more embodiments, the cutter cords are stacked on the spool such that the newly wound cutter cord overlaps the already wound cutter cord. It may be wrapped around.

In a cutter cord made of nylon-based resin, if the already wound cutter cord and the newly wound cutter cord are staggered on the spool and wound in a plurality of rows, the cutter cord It may get twisted. If the cutter cord has a tendency to twist, the longitudinal direction of the cross section of the cutter cord will be different between the part near the eyelet and the part far from the eyelet of the cutter cord sent out of the case. This leads to an increase in energy consumption and an increase in noise accompanying the rotation of the cord. As described above, by winding the cutter cords in a line on the spool, it is possible to prevent the cutter cords from being twisted.

In one or more embodiments, the case may comprise a first case and a second case. The first case may have a notch. The second case may have a projection. A shape of the eyelet may be defined by the notch and the protrusion.

According to the above configuration, with the second case removed from the first case, the cutter cord pulled out from the spool is set in the notch of the first case, and then the second case is attached to the first case. , the cutter cord drawn from the spool can be set in the eyelet. The cutter cord pulled out from the spool can be easily set in the eyelet. In addition, according to the above configuration, the cutter cord set in the notch of the first case is restrained by the projection of the second case, so that the cutter cord enters the gap between the first case and the second case and escapes from the eyelet. You can prevent it from coming off.

In one or more embodiments, the height of the protrusion may be adjustable.

According to the above configuration, even if a cutter cord having a different cross-sectional shape is used, the height of the protrusions can be adjusted according to the cross-sectional shape of the cutter cord, so that the shape of the eyelet can be adjusted according to the cross-sectional shape of the cutter cord. can be

In one or more embodiments, the first case may have a guide member that is detachable from the first case and has the notch formed therein.

According to the above configuration, even when a cutter cord having a different cross-sectional shape is used, by replacing the guide member with a guide member that matches the cross-sectional shape of the cutter cord, the shape of the eyelet can be made according to the cross-sectional shape of the cutter cord. can be done.

In one or more embodiments, the notch includes a widened portion that allows the cutter cord to be positioned at an angle in which the longitudinal direction of the cross section of the cutter cord is twisted with respect to the axis of rotation of the spool; It is arranged between the edge of the first case and the widened portion, and the cutter cord cannot be arranged at an angle in which the longitudinal direction of the cross section of the cutter cord is twisted with respect to the rotation axis of the spool. It may have a narrow width portion.

In the above configuration, the cutter cord pulled out from the spool is inserted into the notch from the edge of the first case without being twisted, passed through the narrow width portion, and then twisted in the wide width portion. Can be set in the notch. Since the twisted cutter cord cannot enter from the widened portion to the narrowed portion, it is possible to maintain the state in which the cutter cord is set in the notch.

In one or more embodiments, the ratio of the longitudinal dimension to the transverse dimension of the cross-section of the cutting cord may be 1.2 or greater.

According to the above configuration, the energy consumed for rotating the cutter cord can be reduced, and noise generated when the cutter cord rotates can be suppressed.

In one or more embodiments, the eyelet holds the cutter cord drawn from the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotational axis of the spool. A code holding section for holding may be provided.

If the cutter cord pulled out from the spool is held at a twisted angle for a long time without using the cutter cord, the cutter cord may become twisted. According to the above configuration, when the cutter cord is not used, the cord holding portion can be used to hold the cutter cord pulled out from the spool without being twisted. can be prevented.

In one or more embodiments, a work machine may include a cord holder and a prime mover that rotates the cord holder. The cord holder may include a spool around which the cutter cord is wound, and a case that houses the spool. The cutter cord may be made of a nylon-based resin and may have a flat cross-sectional shape. The cutter cord may be wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool. The case may include an eyelet for feeding the cutter cord drawn from the spool to the outside of the case. The cutter cord may be delivered from the eyelet such that the longitudinal direction of the cross section of the cutter cord is at a twisted angle with respect to the axis of rotation of the spool.

According to the above configuration, the cutter cord pulled out from the spool and delivered to the outside of the case through the eyelet is held so that the longitudinal direction of the cross section of the cutter cord matches the rotation direction of the cutter cord. By adopting such a configuration, it is possible to reduce the energy consumed for rotating the cutter cord, and to suppress the noise generated when the cutter cord rotates.

In one or more embodiments, the prime mover may be a motor.

In general, in a work machine using an engine as a prime mover, the noise from the engine is large, so the noise from the cutter cord does not significantly affect the quietness of the work machine. However, in a work machine using a motor as a prime mover, the noise from the motor is not so large, so the noise from the cutter cord has a great effect on the quietness of the work machine. According to the above configuration, the noise from the cutter cord can be suppressed, so that the quietness of the work machine can be further enhanced.

In one or more embodiments, the work machine may further include a battery pack that is detachable from the work machine and that supplies power to the motor.

In a work machine that uses a battery pack as a power source, if power consumption is large, the time that the work machine can work continuously without charging the battery pack is shortened. According to the above configuration, it is possible to suppress the power consumption associated with the rotation of the cutter cord, so that the continuous working time can be extended without charging the battery pack.

(Example)
A brush cutter 2 according to an embodiment of a working machine will be described below with reference to the drawings. A bush cutter 2 shown in FIG. 1 is an electric work machine for gardening and is used to cut grass. The bush cutter 2 includes a support rod 4, a front end unit 6 provided at the front end 4a of the support rod 4, a rear end unit 8 provided at the rear end 4b of the support rod 4, and an intermediate portion of the support rod 4. and a grip 12 provided between the loop handle 10 of the support rod 4 and the rear end unit 8. - 特許庁The support rod 4 is in the shape of a hollow pipe and extends linearly from the front end 4a to the rear end 4b.

The front end unit 6 includes a motor housing 16 housing a motor 14 (see FIG. 2), a cord holder 18 detachably attached below the motor housing 16, and a support bar behind the motor housing 16 and the cord holder 18. 4 is provided with a safety cover 20 attached to it. The motor 14 is an outer rotor type brushless three-phase motor. The cord holder 18 is rotationally driven by the motor 14 . The cord holder 18 holds string-like cutter cords 22 and 23 . The ends of the cutter cords 22 and 23 are pulled out from the cord holder 18 and rotate together with the cord holder 18 . The bush cutter 2 of this embodiment cuts plants by means of cutter cords 22 and 23 that rotate at high speed.

The loop handle 10 is in the shape of a hollow pipe and has a loop shape that expands upward and laterally of the support rod 4 . A loop handle 10 is fixed to the support rod 4 .

The grip 12 is formed so as to cover the outer circumference of the support rod 4 . The grip 12 has a lock-off lever 24 provided on the upper surface and a trigger switch 26 provided on the lower surface. A trigger switch 26 is a switch for driving the motor 14 of the front end unit 6 . When the trigger switch 26 is not pushed, power supply to the motor 14 is cut off. Electric power is supplied to the motor 14 when the trigger switch 26 is depressed. The lock-off lever 24 is a lever for regulating and canceling the pushing operation of the trigger switch 26 . When the lock-off lever 24 is not pushed in, the pushing operation of the trigger switch 26 is restricted. When the lock-off lever 24 is pushed in, the restriction on the pushing operation of the trigger switch 26 is released.

An operation panel 28 and a display panel 30 are provided on the upper surface of the grip 12 in front of the lock-off lever 24 . The operation panel 28 accommodates an operation board (not shown). An operation button (not shown) for controlling the drive of the motor 14 of the front end unit 6 is arranged on the operation board. By operating the operation buttons, the operator can perform operations such as switching between driving and stopping the motor 14, switching the rotation direction of the motor 14, changing the rotation speed of the motor 14, and the like. The display panel 30 accommodates a display substrate (not shown). A display lamp (not shown) for displaying the operating state of the motor 14 is attached to the display substrate.

The rear end unit 8 includes a rear end housing 32 housing a control board (not shown) and a battery pack 34 detachably attached to the rear end housing 32 . Battery pack 34 includes a plurality of rechargeable battery cells. Battery pack 34 has, for example, ten lithium-ion battery cells connected in series and has a nominal voltage of 36 volts. The control board controls the operation of the motor 14 by controlling the power supplied from the battery pack 34 to the motor 14 .

An operator who uses the bush cutter 2 holds the loop handle 10 with one hand and the grip 12 with the other hand. Then, the operator pushes the lock-off lever 24 with the base of the thumb holding the grip 12, and pushes the trigger switch 26 with the index finger, middle finger, ring finger and/or little finger of the same hand. Power is thereby supplied to the motor 14 . In this state, the operator can control the operation of the motor 14 by operating the operation buttons of the operation panel 28 with the thumb of the hand holding the grip 12 .

As shown in FIG. 2, the output shaft 42 of the motor 14 has its upper end supported by the motor housing 16 via bearings 44 and its lower end connected to the cord holder 18 . Rotation of the motor 14 is transmitted to the cord holder 18 via the output shaft 42 .

The cord holder 18 has a case 50 and a spool 52 housed in the case 50 . Case 50 is fixed to output shaft 42 . The rotation axis of spool 52 coincides with the rotation axis of output shaft 42 . The cutter cords 22 and 23 are wound around the spool 52 . The cutter cords 22 , 23 are led out of the case 50 through eyelets 54 , 55 provided on the case 50 .

The shapes of the cutter cords 22 and 23 will be described with reference to FIGS. 3 and 4. FIG. The cutter cords 22 and 23 are made of, for example, a nylon resin such as PA6, and are manufactured by, for example, extrusion molding or injection molding. The cutter cords 22 and 23 have a flat cross-sectional shape in which the longitudinal dimension W1 is larger than the lateral dimension H1 when viewed from the plane OP orthogonal to the center line CL of the cutter cords 22 and 23. . Specifically, in the cutter cords 22 and 23, the ratio of the longitudinal dimension W1 to the lateral dimension H1 is, for example, 1.2 or more, preferably 1.5 or more. For example, the lengthwise dimension W1 of the cutter cords 22 and 23 is 4 mm, and the widthwise dimension H1 is 3 mm. When the cutter cords 22 and 23 have such a flat cross-sectional shape, by aligning the longitudinal direction of the cross section with the direction of rotation of the cutter cords 22 and 23, the air flow when the cutter cords 22 and 23 rotate can be reduced. The resistance can be reduced, and the energy consumed for rotating the cutter cords 22 and 23 can be reduced. Also, by aligning the longitudinal direction of the cross section with the direction of rotation of the cutter cords 22 and 23, wind noise when the cutter cords 22 and 23 rotate can be reduced and noise can be suppressed. In the examples shown in FIGS. 3 and 4, the cutter cords 22 and 23 have a major axis in the longitudinal direction and a minor axis in the lateral direction when viewed from a plane orthogonal to the center line of the cutter cords 22 and 23. Although it has an elliptical cross-sectional shape with a It may have an oval or polygonal cross-sectional shape. In either case, if the longitudinal dimension W1 is smaller than the transverse dimension H1, the cross-sectional shape can be said to be flat.

As shown in FIG. 2 , the cutter cords 22 and 23 are wound around the spool 52 so that the longitudinal direction of the cross section is along the rotation axis of the spool 52 . In this embodiment, the cutter cord 22 is wound on the upper portion of the spool 52 and the cutter cord 23 is wound on the lower portion of the spool 52 . The cutter cord 22 is wound on the spool 52 in a line at the same position so that the newly wound cutter cord 22 completely overlaps the already wound cutter cord 22. there is Similarly, the cutter cord 23 is wound on the spool 52 in a line at the same position so that the newly wound cutter cord 23 completely overlaps the already wound cutter cord 23 . being turned. When the cutter cords 22 and 23 are wound around the spool 52 in this manner, the cutter cords 22 and 23 do not develop a tendency to twist even after a long period of time while being wound around the spool 52 .

The cutter cord 22 pulled out from the spool 52 is twisted at the eyelet 54 so that the longitudinal direction of the cross section is substantially parallel to the rotation direction of the cutter cord 22 and is pulled out of the case 50 . The cutter cord 23 is pulled out of the case 50 from the spool 52 while being twisted at the eyelet 55 such that the longitudinal direction of the cross section is substantially parallel to the direction in which the cutter cord 23 rotates. Since the cutter cords 22 and 23 do not have a tendency to twist, by pulling out the cutter cords 22 and 23 at the eyelets 54 and 55 in this way, the entirety of the pulled out cutter cords 22 and 23 are stretched in the longitudinal direction of the cross section. The cutter cords 22 and 23 can be held so that the direction of rotation of the cutter cords 22 and 23 is aligned.

A spool 52 is fixed to a code send button 56 . The code sending button 56 protrudes downward from the case 50 through a through hole 50 a formed in the lower surface of the case 50 . The cord sending button 56 is normally biased downward by a spring 58 , and the spool 52 is pressed against the case 50 so that the spool 52 cannot rotate with respect to the case 50 . Therefore, when the output shaft 42 rotates, the case 50 and the spool 52 rotate integrally. When the cord sending button 56 is pushed while the cord holder 18 is rotating, the spool 52 is separated from the case 50 and the spool 52 is rotatable with respect to the case 50 . At this time, the cutter cords 22 and 23 wound around the spool 52 are sent out by the centrifugal force acting on the cutter cords 22 and 23 extending from the cord holder 18 . As shown in FIG. 1, the safety cover 20 is integrally provided with a trim cutter 20a. The trim cutter 20a cuts off the tips of the extra cutter cords 22, 23 sent out from the cord holder 18, and trims the cutter cords 22, 23 extending from the cord holder 18 to appropriate lengths.

The case 50 includes an upper case 60 shown in FIG. 5 and a lower case 62 shown in FIG. As shown in FIG. 5 , a notch 64 is formed in the upper case 60 at a position corresponding to the eyelet 54 . The notch 64 has a passage portion 64a extending from the edge of the upper case 60 and a window portion 64b communicating with the passage portion 64a. A guide member 66 is detachably attached to the notch 64 of the upper case 60 . A notch 68 is formed in the guide member 66 . The notch 68 has a passage portion 68a extending from the edge of the guide member 66 and a guide portion 68b communicating with the passage portion 68a. Engagement projections 68c projecting from both side surfaces in the circumferential direction are formed in the passage portion 68a. The interval between the engaging projections 68c is smaller than the lengthwise dimension of the cross section of the cutter cord 22 and slightly larger than the lengthwise dimension of the cross section of the cutter cord 22 . The lateral dimension of the guide portion 68b is slightly larger than the longitudinal dimension of the cross section of the cutter cord 22 . When setting the cutter cord 22 to the guide member 66, the cutter cord 22 pulled out from the spool 52 is inserted into the passages 62a and 68a as it is without being twisted, and is passed between the engaging protrusions 68c. The cutter cord 22 is twisted 90 degrees at the portion 68b. As a result, the cutter cord 22 is set on the guide portion 68b. Although not shown in FIG. 5, a cutout 65 having the same shape as the cutout 64 is formed at a position corresponding to the eyelet 55 of the upper case 60 . A guide member 67 (see FIG. 2) having the same shape as the guide member 66 is detachably attached to the notch 65 .

As shown in FIG. 6, projecting members 70 and 71 are fixed to the lower case 62 at positions corresponding to the eyelets 54 and 55 . The projecting member 70 has a shape that enters into the passage portions 62 a and 68 a of the upper case 60 when the lower case 62 is attached to the upper case 60 . The projecting member 71 also has a shape similar to that of the projecting member 70 .

As shown in FIG. 7, when the lower case 62 is attached to the upper case 60, the guide members 66 and 67 surround the cutter cords 22 and 23 at the eyelets 54 and 55 from above and laterally, and the projecting members 70 , 71 push up the cutter cords 22, 23 from below. As a result, the cutter cords 22 and 23 passing through the eyelets 54 and 55 can be held in a twisted state so that the longitudinal direction of the cross section is substantially parallel to the direction of rotation of the cutter cords 22 and 23 . By making the vertical distance from the upper surfaces of the guide portions 68b and 69b of the guide members 66 and 67 to the upper ends of the projecting members 70 and 71 smaller than the widthwise dimension of the cutter cords 22 and 23, the guide The members 66, 67 and the projecting members 70, 71 can hold the cutter cords 22, 23 in a crushed state.

As shown in FIG. 8, notches 68 and 69 of guide members 66 and 67 are formed with cord holding portions 68d and 69d for holding the cutter cords 22 and 23 when they are not used. You may The cord holding portions 68 d and 69 d are shaped to hold the cutter cords 22 and 23 with the longitudinal directions of the cross sections of the cutter cords 22 and 23 substantially parallel to the rotational axis of the spool 52 . When the brush cutter 2 and the cord holder 18 are stored without being used for a long period of time, the cutter cords 22, 23 pulled out from the spool 52 are held by the cord holding portions 68d, 69d. 23 can be prevented from being twisted.

The positions of the upper ends of the projecting members 70 and 71 with respect to the lower case 62 may be adjustable. For example, the projecting members 70 and 71 may be vertically movably held on the lower case 62 and urged upward by an elastic member such as a spring. Alternatively, the projecting members 70 and 71 may be vertically movably held on the lower case 62, and the vertical position of the lower case 62 may be adjusted by an adjusting member such as an adjusting screw.

In the above embodiment, the upper case 60 is provided with the guide members 66, 67 having the notches 68, 69, and the lower case 62 is provided with the projecting members 70, 71. Alternatively, guide members 66 and 67 having cutouts 68 and 69 may be provided on the lower case 62 and projecting members 70 and 71 may be provided on the upper case 60 .

In the above embodiment, the brush cutter 2 is configured to drive the motor 14 with electric power supplied from the battery pack 34 . Alternatively, the brush cutter 2 may be configured to drive the motor 14 with power supplied from a power cord instead of the battery pack 34 .

In the above embodiment, the brush cutter 2 has the motor 14 as a prime mover for rotating the cord holder 18 . Alternatively, the bush cutter 2 may be configured to include an engine as a prime mover for rotating the cord holder 18 .

In the above embodiment, the brush cutter 2 has been described as an example of the working machine, but the working machine may be another type of working machine such as a mower having wheels or a lawn mower.

As can be seen, in one or more embodiments, the cord holder 18 includes a spool 52 around which the cutter cords 22, 23 are wound and a case 50 that houses the spool 52. As shown in FIG. The cutter cords 22 and 23 are made of nylon resin and have a flat cross-sectional shape. The cutter cords 22 , 23 are wound around the spool 52 such that the longitudinal direction of the cross section of the cutter cords 22 , 23 is substantially parallel to the rotational axis of the spool 52 . The case 50 has eyelets 54 and 55 for sending out the cutter cords 22 and 23 pulled out from the spool 52 to the outside of the case 50 . The cutter cords 22 , 23 are sent out from the eyelets 54 , 55 so that the longitudinal direction of the cross section of the cutter cords 22 , 23 forms a twisted angle with respect to the rotational axis of the spool 52 .

According to the above configuration, the cutter cords 22 and 23 pulled out from the spool 52 and delivered to the outside of the case 50 through the eyelets 54 and 55 are arranged such that the longitudinal direction of the cross section of the cutter cords 22 and 23 is the same as that of the cutter cord 22 . , 23 are held in alignment with each other. With such a configuration, the energy consumed for rotating the cutter cords 22 and 23 can be reduced, and noise generated when the cutter cords 22 and 23 rotate can be suppressed.

In one or more embodiments, the cutter cords 22,23 overlap the already wound cutter cords 22,23 with the newly wound cutter cords 22,23 on the spool 52. It is stacked in a line and wound like this.

In the cutter cords 22 and 23 made of nylon-based resin, the already wound cutter cords 22 and 23 and the newly wound cutter cords 22 and 23 are shifted with respect to the spool 52 to form a plurality of rows. , the cutter cords 22 and 23 may become twisted. If the cutter cords 22 and 23 become twisted, of the cutter cords 22 and 23 fed out of the case 50, the portions near the eyelets 54 and 55 and the portions far from the eyelets 54 and 55 may twist the cutter cords 22 and 23. , 23 are in different longitudinal directions, resulting in an increase in energy consumption and noise accompanying the rotation of the cutter cords 22 and 23 . As described above, by winding the cutter cords 22 and 23 in a line on the spool 52, it is possible to prevent the cutter cords 22 and 23 from being twisted.

In one or more embodiments, the case 50 may comprise an upper case 60 (an example of a first case) and a lower case 62 (an example of a second case). The upper case 60 has guide members 66 and 67 having cutouts 68 and 69 . The lower case 62 has projection members 70 and 71 (examples of projections). The shape of the eyelets 54,55 is defined by notches 68,69 and projecting members 70,71.

According to the above configuration, with the lower case 62 removed from the upper case 60, the cutter cords 22, 23 pulled out from the spool 52 are set in the cutouts 68, 69 of the upper case 60, and then the upper case 60 is By assembling the lower case 62, the cutter cords 22, 23 pulled out from the spool 52 can be set in the eyelets 54, 55. - 特許庁The cutter cords 22, 23 pulled out from the spool 52 can be easily set in the eyelets 54, 55. - 特許庁Further, according to the above configuration, the cutter cords 22, 23 set in the cutouts 68, 69 of the upper case 60 are restrained by the projecting members 70, 71 of the lower case 62, so that the cutter cords 22, 23 are It is possible to prevent it from getting into the gap between the upper case 60 and the lower case 62 and coming off the eyelets 54 and 55.例文帳に追加

In one or more embodiments, the height of protruding members 70, 71 is adjustable.

According to the above configuration, even when the cutter cords 22 and 23 having different cross-sectional shapes are used, by adjusting the heights of the projecting members 70 and 71 according to the cross-sectional shapes of the cutter cords 22 and 23, the cutter can be The shape of the eyelets 54,55 can be adapted to the cross-sectional shape of the cords 22,23.

In one or more embodiments, the upper case 60 has guide members 66, 67 that are removable from the upper case 60 and have notches 68, 69 formed therein.

According to the above configuration, even if the cutter cords 22 and 23 having different cross-sectional shapes are used, the cutter cords 22 and 23 can be changed by replacing the guide members 66 and 67 with the guide members 66 and 67 that match the cross-sectional shape of the cutter cords 22 and 23 . The shape of the eyelets 54 and 55 can be made according to the cross-sectional shape of the .

In one or more embodiments, the notches 68 , 69 are guides that allow the cutting cords 22 , 23 to be positioned at an angle where the longitudinal direction of the cross-section of the cutting cords 22 , 23 is twisted relative to the axis of rotation of the spool 52 . Portions 68b, 69b (examples of widened portions) are arranged between the edges of the upper case 60 and the guide portions 68b, 69b, and the cutter cords 22, 23 are arranged so that the longitudinal direction of the cross section of the cutter cords 22, 23 is A region (an example of a narrow width portion) is provided between the engaging projections 68c that cannot be arranged at a twisted angle with respect to the rotation axis of the spool 52.

In the above configuration, the cutter cords 22 and 23 pulled out from the spool 52 are inserted into the cutouts 68 and 69 from the edges of the upper case 60 without being twisted, and passed through the engaging protrusions 68c. The cutter cords 22 and 23 can be set in the cutouts 68 and 69 by twisting the guide portions 68b and 69b. Since the twisted cutter cords 22, 23 cannot enter between the engaging protrusions 68c from the guide portions 68b, 69b, the cutter cords 22, 23 must be kept in the cutouts 68, 69. can be done.

In one or more embodiments, the ratio of the longitudinal dimension to the lateral dimension of the cross-section of the cutting cords 22, 23 is 1.2 or greater.

According to the above configuration, the energy consumed for rotating the cutter cords 22, 23 can be reduced, and noise generated when the cutter cords 22, 23 rotate can be suppressed.

In one or more embodiments, eyelets 54 , 55 are positioned so that the longitudinal direction of the cross-section of cutter cords 22 , 23 is substantially parallel to the axis of rotation of spool 52 . , 23 are provided.

If the cutter cords 22 and 23 pulled out from the spool 52 are held at a twisted angle for a long time without using the cutter cords 22 and 23, the cutter cords 22 and 23 may become twisted. According to the above configuration, when the cutter cords 22 and 23 are not used, the cutter cords 22 and 23 pulled out from the spool 52 can be held without being twisted by using the cord holding portions 68d and 69d. Therefore, it is possible to prevent the cutter cords 22 and 23 from being twisted.

In one or more embodiments, the bush cutter 2 (exemplary work machine) includes a cord holder 18 and a motor 14 (exemplary prime mover) that rotates the cord holder 18 . The cord holder 18 has a spool 52 around which the cutter cords 22 and 23 are wound, and a case 50 that accommodates the spool 52 . The cutter cords 22 and 23 are made of nylon resin and have a flat cross-sectional shape. The cutter cords 22 , 23 are wound around the spool 52 such that the longitudinal direction of the cross section of the cutter cords 22 , 23 is substantially parallel to the rotational axis of the spool 52 . The case 50 has eyelets 54 and 55 for sending out the cutter cords 22 and 23 pulled out from the spool 52 to the outside of the case 50 . The cutter cords 22 , 23 are sent out from the eyelets 54 , 55 so that the longitudinal direction of the cross section of the cutter cords 22 , 23 forms a twisted angle with respect to the rotational axis of the spool 52 .

According to the above configuration, the cutter cords 22 and 23 pulled out from the spool 52 and delivered to the outside of the case 50 through the eyelets 54 and 55 are arranged such that the longitudinal direction of the cross section of the cutter cords 22 and 23 is the same as that of the cutter cord 22 . , 23 are held in alignment with each other. With such a configuration, the energy consumed for rotating the cutter cords 22 and 23 can be reduced, and noise generated when the cutter cords 22 and 23 rotate can be suppressed.

In one or more embodiments, the prime mover that rotates cord holder 18 is motor 14 .

In general, in a work machine using an engine as a prime mover, the noise from the engine is large, so the noise from the cutter cords 22 and 23 does not significantly affect the quietness of the work machine. However, in the brush cutter 2 that uses the motor 14 as the prime mover, the noise from the motor 14 is not so large, so the noise from the cutter cords 22 and 23 has a large effect on the quietness of the brush cutter 2 . According to the above configuration, the noise from the cutter cords 22 and 23 can be suppressed, so the quietness of the bush cutter 2 can be further enhanced.

In one or more embodiments, brush cutter 2 further includes a battery pack 34 that is removable from brush cutter 2 and powers motor 14 .

In the brush cutter 2 that uses the battery pack 34 as a power source, if the power consumption is large, the time that the battery pack 34 can be continuously operated without being charged is shortened. According to the above configuration, it is possible to suppress the power consumption associated with the rotation of the cutter cords 22 and 23, so that the continuous working time can be extended without charging the battery pack 34. FIG.

2: Brush cutter 4: Support rod 4a: Front end 4b: Rear end 6: Front end unit 8: Rear end unit 10: Loop handle 12: Grip 14: Motor 16: Motor housing 18: Cord holder 20: Safety cover 20a: Trim cutter 22: Cutter cord 23: Cutter cord 24: Lock-off lever 26: Trigger switch 28: Operation panel 30: Display panel 32: Rear end housing 34: Battery pack 42: Output shaft 44: Bearing 50: Case 50a: Through hole 52: Spool 54 : Eyelet 55 : Eyelet 56 : Cord sending button 58 : Spring 60 : Upper case 62 : Lower case 62a : Passage 64 : Notch 64a : Passage 64b : Window 65 : Notch 66 : Guide member 67 : Guide member 68: notch 68a: passage portion 68b: guide portion 68c: engaging projection 68d: cord holding portion 69: notch 69b: guide portion 69d: cord holding portion 70: projection member 71: projection member

Claims (11)

a code holder,
a spool around which the cutter cord is wound;
A case for accommodating the spool is provided,
The cutter cord is made of nylon resin and has a flat cross-sectional shape,
the cutter cord is wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool;
the case is provided with an eyelet for feeding the cutter cord pulled out from the spool to the outside of the case,
the cutter cord is fed out from the eyelet such that the longitudinal direction of the cross section of the cutter cord forms a twisted angle with respect to the rotation axis of the spool ;
the case comprises a first case and a second case,
The first case has a notch,
The second case has a protrusion,
A cord holder , wherein the shape of the eyelet is defined by the notch and the projection . 2. The cord holder of claim 1 , wherein the height of said protrusion is adjustable. 3. The cord holder according to claim 1, wherein said first case is detachable from said first case and has a guide member having said notch. The notch is
a widened portion capable of arranging the cutter cord at an angle in which the longitudinal direction of the cross section of the cutter cord is twisted with respect to the rotation axis of the spool;
It is arranged between the edge of the first case and the widened portion, and the cutter cord cannot be arranged at an angle in which the longitudinal direction of the cross section of the cutter cord is twisted with respect to the rotation axis of the spool. 4. A cord holder according to any one of claims 1 to 3 , comprising a narrowed portion. a code holder,
a spool around which the cutter cord is wound;
A case for accommodating the spool is provided,
The cutter cord is made of nylon resin and has a flat cross-sectional shape,
the cutter cord is wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool;
the case is provided with an eyelet for feeding the cutter cord pulled out from the spool to the outside of the case,
the cutter cord is delivered from the eyelet such that the longitudinal direction of the cross section of the cutter cord forms a twisted angle with respect to the rotation axis of the spool ;
The eyelet includes a cord holding portion that holds the cutter cord pulled out from the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool , code holder. 3. The cutter cord is wound around the spool in a line so that the newly wound cutter cord overlaps the already wound cutter cord. A code holder of any one of 1 to 5 . The cord holder according to any one of claims 1 to 6, wherein the ratio of the longitudinal dimension to the transverse dimension of the cross section of the cutter cord is 1.2 or more. a cord holder;
A working machine comprising a prime mover for rotating the cord holder,
the code holder
a spool around which the cutter cord is wound;
A case for accommodating the spool is provided,
The cutter cord is made of nylon resin and has a flat cross-sectional shape,
the cutter cord is wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool;
the case is provided with an eyelet for feeding the cutter cord pulled out from the spool to the outside of the case,
the cutter cord is fed out from the eyelet such that the longitudinal direction of the cross section of the cutter cord forms a twisted angle with respect to the rotation axis of the spool ;
the case comprises a first case and a second case,
The first case has a notch,
The second case has a protrusion,
The working machine , wherein the shape of the eyelet is defined by the notch and the projection . a cord holder;
A working machine comprising a prime mover for rotating the cord holder,
the code holder
a spool around which the cutter cord is wound;
A case for accommodating the spool is provided,
The cutter cord is made of nylon resin and has a flat cross-sectional shape,
the cutter cord is wound around the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool;
the case is provided with an eyelet for feeding the cutter cord pulled out from the spool to the outside of the case,
the cutter cord is fed out from the eyelet such that the longitudinal direction of the cross section of the cutter cord forms a twisted angle with respect to the rotation axis of the spool ;
The eyelet includes a cord holding portion that holds the cutter cord pulled out from the spool such that the longitudinal direction of the cross section of the cutter cord is substantially parallel to the rotation axis of the spool , working machine. A work machine according to claim 8 or 9 , wherein said prime mover is a motor. 11. The work machine according to claim 10, further comprising a battery pack detachable from the work machine and supplying power to the motor.

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