Lawn trimmer, work head and trimmer

Abstract

The application provides a grass hitting head, a working head and a grass hitting machine. The grass hitting head comprises a reel and a head shell covering the reel. The grass hitting head has a winding mode and a releasing mode. In the winding mode, the head shell is stationary, the reel rotates relative to the head shell, and a grass hitting rope is wound on the reel. In the releasing mode, the grass hitting head rotates in the same direction as in the winding mode, the reel is separated from the head shell, and the reel and the head shell are both moved to a non-powered position to release the grass hitting rope. The grass hitting head disclosed in the application has the winding mode and the releasing mode, and the automatic winding and the automatic releasing replace the traditional manual winding and the manual releasing, the winding and the releasing are intelligentized, and thus manpower is saved.

Description

Technical Field

[0001] This invention relates to weeding equipment, and more particularly to a weeding head, a working head, and a weeding machine. Background Technology

[0002] A lawnmower is a device for cutting weeds. It consists of a trimming head with trimming rope wound inside. The two ends of the trimming rope protrude from the trimming head. When the trimming head is in operation, it rotates at high speed, causing the trimming rope to rotate at the same speed. During this process, the high-speed rotating rope impacts the weeds and generates a cutting force, thus cutting the weeds.

[0003] With existing hay trimmers, users need to manually install the hay trimming rope onto the trimmer, a process that is cumbersome, time-consuming, and labor-intensive.

[0004] Furthermore, after the trimming rope wears down, the length of the rope exposed above the trimming head is insufficient to cut weeds, requiring the rope to be let out to continue trimming. However, with existing trimming heads, users need to manually let out the rope, and this manual letting out can only be done when the trimmer is stopped. This manual letting out method is cumbersome and provides a poor user experience. Summary of the Invention

[0005] The purpose of this application is to provide a mowing head, a working head, and a mowing machine that can automatically lay out and wind the mowing line.

[0006] A first aspect of this application provides a grass trimming head, comprising:

[0007] A spool and a head cover fitted over the spool;

[0008] The grass-cutting head has a winding mode and a releasing mode;

[0009] In the winding mode, the head shell remains stationary, while the spool rotates relative to the head shell, and the straw rope is wound onto the spool.

[0010] In the release mode, the trimmer head rotates in the same direction as in the winding mode, the spool separates from the head shell, and both the spool and the head shell move to a powerless position to release the trimmer rope.

[0011] In one embodiment, in the winding mode, the spool rotates while the head shell is restricted from rotating; in the unwinding mode, the spool and the head shell are separated, and the spool and the head shell rotate in the same direction. Under the centrifugal force of the straw rope, the rotational speed of the spool is less than that of the head shell.

[0012] In one embodiment, the hay trimmer further includes a transmission component configured to drive the spool to rotate synchronously; the spool is configured to move along a longitudinal axis and to move between a first axial position and a second axial position; when the spool is in the first axial position, the transmission component abuts against the spool to drive the spool to rotate synchronously; when the spool is in the second axial position, the spool separates from the transmission component.

[0013] In one embodiment, the transmission element includes a transmission portion, and the spool includes a transmission cavity adapted to the transmission portion;

[0014] When the spool is located in the first axial position, the transmission part is accommodated in the transmission cavity, and the outer wall surface of the transmission part is in contact with the inner wall surface of the transmission cavity;

[0015] When the spool is in the second axial position, at least a portion of the transmission part is away from the transmission cavity, and the outer wall surface of the transmission part is separated from the inner wall surface of the transmission cavity.

[0016] In one embodiment, the transmission part includes a first end and a second end disposed opposite to each other in the direction from the first axial position to the second axial position, the direction from the first end to the second end being consistent with the direction from the first axial position to the second axial position; the outer contour of the cross-section of the first end is larger than the outer contour of the cross-section of the second end.

[0017] In one embodiment, the outer contour of the cross-section of the transmission part gradually decreases from the first axial position to the second axial position.

[0018] In one embodiment, the trimmer head includes a first limiting protrusion and a first limiting recess that are adapted to each other; one of the first limiting protrusion and the first limiting recess is disposed in the transmission part, and the other of the first limiting protrusion and the first limiting recess is disposed in the transmission cavity; when the spool is located in the first axial position, the first limiting protrusion and the first limiting recess are adapted to each other, and the transmission part drives the spool to rotate synchronously; when the spool is located in the second axial position, the first limiting protrusion and the first limiting recess are separated.

[0019] In one embodiment, the head shell is configured to move along a longitudinal axis and to move between a third axial position and a fourth axial position; when the head shell is in the third axial position, the spool abuts against the head shell to drive the head shell to rotate synchronously; when the head shell is in the fourth axial position, the head shell separates from the spool.

[0020] In one embodiment, the hay-trimming head includes a matching second limiting protrusion and a second limiting recess; one of the second limiting protrusion and the second limiting recess is disposed on the head shell, and the other of the second limiting protrusion and the second limiting recess is disposed on the spool; when the head shell is located in the third axial position, the second limiting protrusion and the second limiting recess are matched, and the spool drives the head shell to rotate synchronously; when the head shell is located in the fourth axial position, the second limiting protrusion and the second limiting recess are separated.

[0021] In one embodiment, the second limiting protrusion includes a first guide surface and a first stop surface; the first stop surface extends in a direction from the third axial position to the fourth axial position, and the first stop surface is configured to restrict the spool from rotating in a first rotation direction; the first guide surface includes a connecting end and an extending end, the connecting end is connected to the first stop surface, and the first guide surface is inclined in a direction from the connecting end to the extending end.

[0022] The second limiting recess includes a second guide surface and a second stop surface, wherein the second guide surface is adapted to the first guide surface and the second stop surface is adapted to the first stop surface;

[0023] When the head shell is located at the third axial position, the first guide surface abuts against the second guide surface, and the spool drives the head shell to rotate synchronously.

[0024] In one embodiment, at least a portion of the structure of the first guide surface has a component in the direction of rotation of the spool.

[0025] In one embodiment, the mowing head further includes a damping element, which is splinedly connected to the head shell and configured to limit the rotation of the head shell;

[0026] The damping element is configured to have a locked state and a rotating state. When the damping element is in the locked state, the damping element restricts the rotation of the head shell.

[0027] When the damping element is in the rotating state, the head shell drives the damping element to rotate synchronously.

[0028] In one embodiment, the mowing head further includes a locking member configured to restrict the rotation of the damping member; the damping member has an adaptation opening adapted to the locking member, the locking member is configured to move between a first position and a second position, when the locking member is in the second position, the locking member is located within the adaptation opening, restricting the rotation of the damping member, and the damping member is in the locking state.

[0029] In one embodiment, the mowing head further includes a reset member, which is fixedly connected to the locking member and configured to move the locking member from the second position to the first position.

[0030] A second aspect of this application provides a grass trimming head, comprising:

[0031] A spool and a head cover fitted over the spool;

[0032] The hay-cutting head has a winding mode. In the winding mode, the hay-cutting head rotates in the same direction as during hay-cutting operations, the head shell remains stationary, and the spool rotates relative to the head shell, with the hay-cutting rope wound around the hay-cutting head.

[0033] A third aspect of this application provides a grass trimming head, which includes:

[0034] A spool and a head cover fitted over the spool;

[0035] The grass-cutting head has a winding mode and a releasing mode;

[0036] In the winding mode, the hay-cutting head rotates along the first rotation direction, the head shell remains stationary, and the spool rotates relative to the head shell, with the hay-cutting rope wound around the spool;

[0037] In the line-laying mode, the grass-cutting head rotates along the second rotation direction, the spool separates from the head shell, and under the action of the centrifugal force of the grass-cutting rope, the spool moves to a position without power to release the grass-cutting rope;

[0038] The first rotation direction is the same as the second rotation direction.

[0039] A fourth aspect of this application provides a working head, which includes the above-mentioned grass trimming head and a driving device, wherein the driving device is configured to drive the grass trimming head to rotate.

[0040] A fifth aspect of this application provides a lawn mower, which includes the aforementioned mowing head and a drive device, the drive device being configured to drive the mowing head to rotate, and the lawn mower further includes an operating device for user operation to control the lawn mower.

[0041] The main technical effects achieved by the embodiments of this application are:

[0042] The hay-trimming head disclosed in this application has a winding mode and a releasing mode. It replaces the traditional manual winding and releasing with automatic winding and releasing, achieving intelligent winding and releasing, thus saving manpower. Furthermore, in the above device, the drive unit does not need to rotate in either direction; it only needs to rotate in one direction to achieve automatic winding and releasing. Therefore, this application avoids the problem of loose nuts and eliminates the need for adding anti-loosening adhesive to secure the nuts. Attached Figure Description

[0043] Figure 1 This is a three-dimensional structural diagram of the grass trimming head after the trimming rope is installed in this embodiment;

[0044] Figure 2 This is a schematic cross-sectional view of the grass-cutting head in the winding mode of this embodiment;

[0045] Figure 3 This is a schematic cross-sectional view of the grass-cutting head in the line-laying mode of this embodiment;

[0046] Figure 4 This is a schematic diagram of the cross-sectional structure of the mowing head in the mowing mode of this embodiment;

[0047] Figure 5 This is a three-dimensional structural diagram of the head shell in this embodiment;

[0048] Figure 6 This is a three-dimensional structural diagram of the upper shell in this embodiment;

[0049] Figure 7 This is another three-dimensional structural diagram of the upper shell in this embodiment;

[0050] Figure 8 This is a three-dimensional structural diagram of the spool in this embodiment;

[0051] Figure 9 This is a schematic diagram of the planar structure of the spool in this embodiment;

[0052] Figure 10 This is a schematic diagram of another planar structure of the spool in this embodiment;

[0053] Figure 11 This is a three-dimensional structural diagram of the damping component in this embodiment;

[0054] Figure 12 This is a schematic diagram of the planar structure of the damping element in this embodiment;

[0055] Figure 13 This is a three-dimensional structural diagram of the button in this embodiment;

[0056] Figure 14 This is a schematic diagram of the button's planar structure in this embodiment;

[0057] Figure 15 This is a three-dimensional structural diagram of the transmission component in this embodiment;

[0058] Figure 16 This is a schematic diagram of the planar structure of the transmission component in this embodiment.

[0059] Explanation of reference numerals in the attached figures

[0060] 1. Trimming head; 2. Trimming rope; 10. Drive unit; 20. Spool; 21. Inner threading hole; 22. Second limiting protrusion; 22. First stop surface; 222. First guide surface; 2221. Connecting end; 2222. Extension end; 23. First axial position; 24. Second axial position; 25. First limiting recess; 26. Transmission cavity; 30. Head shell; 31. Outer threading hole; 32. Upper shell; 33. Lower shell; 34. Third axial position; 35. Fourth axial position; 36. Second limiting recess; 36. Second stop surface; 361. Second guide surface; Guide surface 362, spring 40, damping element 50, external spline 51, adapter opening 52, locking element 60, reset element 70, winding switch 80, button 90, first part 91, first surface 911, second part 92, second surface 921, striking cap 100, transmission element 200, transmission part 210, first limiting protrusion 211, first end 212, second end 213, protective cover 300, longitudinal axis 1a, included angle α, winding mode A, unwinding mode B, mowing mode C Detailed Implementation

[0061] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The manner described in the following exemplary embodiments does not represent all manner consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0062] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one, which will be separately stated if only "a" is referred to. "A plurality" or "several" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper," etc., are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including," etc., mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms “connection” or “link” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0063] A lawn mower is a device that cuts weeds and is mainly used in lawn mowing, garden trimming, and other similar applications.

[0064] like Figure 1 As shown, the lawn mower includes a mowing head 1, with a mowing rope 2 wound inside the mowing head 1. Both ends of the mowing rope 2 extend out of the mowing head 1 and are exposed. When the mowing head 1 is in operation, it rotates at high speed, and the mowing rope 2 rotates at high speed along with it. During this process, the high-speed rotating mowing rope 2 impacts the weeds and generates a cutting force, thereby cutting the weeds.

[0065] like Figure 4As shown, the hay trimmer head 1 includes a spool 20, a head shell 30, and a drive device 10. The drive device 10 is connected to the spool 20 and configured to drive the spool 20 to rotate around a longitudinal axis 1a. The spool 20 is sleeved on the drive device 10. The spool 20 has inner threading holes 21 for passing through the hay trimmer rope 2, which are used to fix the hay trimmer rope 2. The number of inner threading holes 21 is even. The hay trimmer rope 2 passes through the inner threading holes 21 across the spool 20, and the inner threading holes 21 serve as fixing points so that the hay trimmer rope 2 can be wound around the spool 20. The head shell 30 covers the spool 20 and is driven by the spool 20; in other words, the head shell 30 can rotate around the longitudinal axis 1a together with the spool 20. The head shell 30 has outer threading holes 31 for passing through the hay trimmer rope 2, and the number of outer threading holes 31 is even. The two ends of the straw-cutting rope 2, wound on the spool 20, pass through the external threading holes 31 and protrude from the head shell 30. Furthermore, as... Figure 5 As shown, the head shell 30 includes an upper shell 32 and a lower shell 33. This structure facilitates disassembly and assembly, thereby making it easy to assemble the spool 20 into the head shell 30. This application does not limit the shape and structure of the head shell 30, as long as it can realize the assembly of the grass trimming head 1.

[0066] like Figure 1 As shown, the grass trimmer 1 also includes a protective cover 300, which is used to prevent the grass trimmer rope 2 from causing injury to the user.

[0067] In the above configuration, when the grass trimmer 1 is working, the drive device 10 drives the spool 20 to rotate at high speed. At the same time, the spool 20 drives the head shell 30 and the grass trimmer rope 2 to rotate at high speed together.

[0068] In one design, when the user needs to install the trimming rope 2 onto the trimming head 1, first, the upper shell 32 and lower shell 33 are disassembled, and the spool 20 is removed. Then, the user manually winds the trimming rope 2 onto the spool 20, and then places the spool 20 in a suitable position within the head shell 30 so that both ends of the trimming head 1 protrude through the external threading holes 31 of the head shell 30. Finally, the upper shell 32 and lower shell 33 are reassembled to complete the installation of the trimming rope 2 and the trimming head 1.

[0069] In this design, the user needs to manually install the trimming rope 2 onto the trimming head 1, a cumbersome and time-consuming process. Furthermore, after the trimming rope 2 wears down, the length of the rope protruding from the trimming head 1 becomes insufficient to cut weeds, requiring the rope to be let out to continue trimming. However, with the existing trimming head 1, the user must manually let out the rope, and this manual letting out can only be done when the trimmer is stopped. This manual letting out method is cumbersome and provides a poor user experience.

[0070] In this application, the grass trimmer 1 can automatically wind and automatically release the line, and the grass trimmer 1 has a winding mode A and a releasing mode B.

[0071] The specific principle of automatic winding is as follows: when the user needs to replenish new straw rope 2, the user can align the inner threading hole 21 and the outer threading hole 31, then pass the straw rope 2 through the outer threading hole 31 and then into the inner threading hole 21. At this time, as long as the spool 20 and the head shell 30 can move relative to each other, the limiting effect of the outer threading hole 31 on the straw rope 2 will cause the straw rope 2 to gradually wind around the spool 20 as the outer threading hole 31 moves relative to the spool 20. In this embodiment, in winding mode A, the drive device 10 drives the spool 20 to rotate, and the head shell 30 is restricted from rotating, so that relative movement occurs between the spool 20 and the head shell 30, and the straw trimmer head 1 performs automatic winding.

[0072] The principle of automatic thread feeding is that the thread feeding process is the reverse of the winding process. In this embodiment, during automatic winding, the rotational speed of the spool 20 is greater than that of the head shell 30. Therefore, during thread feeding, the rotational speed of the spool 20 is less than that of the head shell 30. In thread feeding mode B, the spool 20 is separated from both the drive device 10 and the head shell 30. Subsequently, under the action of inertia, the spool 20 and the head shell 30 rotate in the same direction. Furthermore, under the action of the centrifugal force of the straw rope 2, the rotational speed of the spool 20 is less than that of the head shell 30, and the straw-beating head 1 performs automatic thread feeding.

[0073] In addition, the hay trimmer 1 also has a hay trimming mode C. In hay trimming mode C, the drive device 10 drives the spool 20 to rotate, and at the same time, the spool 20 drives the head shell 30 and the hay trimming rope 2 to rotate at high speed together.

[0074] This application achieves automatic winding of the grass trimmer head 1 through the inclined surface fit between the spool 20 and the head shell 30 and the provision of a damping element 50. The head shell 30 can rotate relative to the spool 20, and the head shell 30 can also slide relative to the spool 20 along the longitudinal axis 1a, wherein the head shell 30 is configured to move between a third axial position 34 and a fourth axial position 35.

[0075] Specifically, in combination Figures 5 to 10The head shell 30 is provided with a second limiting recess 36, and the spool 20 is provided with a second limiting protrusion 22 that matches the second limiting recess 36. The tweezer head 1 also includes a spring 40 that applies a force between the head shell 30 and the spool 20. One end of the spring 40 is connected to the head shell 30, and the other end is connected to the spool 20. The spring 40 applies a force that brings the spool 20 closer to the top cover. When the head shell 30 is in the third axial position 34, the second limiting protrusion 22 matches the second limiting recess 36, and under the force of the spring 40, the second limiting protrusion 22 and the second limiting recess 36 abut tightly, and the spool 20 drives the head shell 30 to rotate synchronously. When the head shell 30 is in the fourth axial position 35, the second limiting protrusion 22 separates from the second limiting recess 36, thereby separating the head shell 30 from the spool 20. Of course, in other embodiments, the head shell 30 may be provided with a second limiting protrusion 22 and the spool 20 may be provided with a second limiting recess 36, as long as one of the second limiting protrusion 22 and the second limiting recess 36 is provided on the head shell 30 and the other of the second limiting protrusion 22 and the second limiting recess 36 is provided on the spool 20.

[0076] It should be noted that the number of second limiting protrusions 22 corresponds to the number of inner threading holes 21, and the number of inner threading holes 21 is even. Similarly, the number of second limiting recesses 36 also corresponds to the number of inner threading holes 21. In this embodiment, the spool 20 has six inner threading holes 21, and the number of second limiting recesses 36 and second limiting protrusions 22 is also six. Of course, in other embodiments, the number of inner threading holes 21, second limiting protrusions 22, and second limiting recesses 36 can be other values, as long as their numbers correspond.

[0077] Furthermore, the aforementioned head shell 30 can move between the third axial position 34 and the fourth axial position 35, which should be understood as the head shell 30 being movable relative to the spool 20 between the third axial position 34 and the fourth axial position 35.

[0078] like Figure 8 and Figure 9As shown, the second limiting protrusion 22 includes a first stop surface 221 and a first guide surface 222. The first stop surface 221 extends in a direction from the third axial position 34 to the fourth axial position 35. When the head shell 30 is located at the third axial position 34, the first stop surface 221 abuts against the second limiting recess 36 to restrict the spool 20 from rotating in the first rotation direction. The first guide surface 222 includes a connecting end 2221 and an extension end 2222, with the connecting end 2221 connected to the first stop surface 221. The first guide surface 222 is inclined in the direction from the connecting end 2221 to the extension end 2222, and at least a portion of the inclination direction of the first guide surface 222 has a component in the rotation direction of the spool 20. When the head shell 30 is located at the third axial position 34, the first guide surface 222 abuts against the second limiting recess 36, and under the action of the abutment force, the spool 20 drives the head shell 30 to rotate synchronously. With this design, when the second limiting protrusion 22 rotates, the first guide surface 222 can more easily drive the second limiting recess 36 to rotate.

[0079] In this embodiment, the first stop surface 221 and the first guide surface 222 of the first limiting protrusion 211 are trapezoidal. Of course, in other embodiments, the first stop surface 221 and the first guide surface 222 can also be V-shaped or other shapes, as long as they can restrict the spool 20 from rotating in the first rotation direction and drive the second limiting recess 36 to rotate.

[0080] like Figure 7 As shown, the second limiting recess 36 includes a second guide surface 362 and a second stop surface 361. The second guide surface 362 is adapted to the first guide surface 222. When the head shell 30 is in the third axial position 34, the first guide surface 222 abuts against the second guide surface 362, thereby causing the spool 20 to drive the head shell 30 to rotate synchronously. The second stop surface 361 is adapted to the first stop surface 221. When the head shell 30 is in the third axial position 34, the second stop surface 361 abuts against or pushes against the first stop surface 221, thereby restricting the first stop surface 221 from rotating along the first rotation direction.

[0081] It should be noted that in this application, the first rotation direction is opposite to the direction in which the spool 20 rotates around the longitudinal axis 1a when the driving device 10 drives the spool 20 to rotate.

[0082] The mowing head 1 also includes a damping element 50, which is splinedly connected to the head housing 30 and configured to limit the rotation of the head housing 30. For example... Figures 2 to 4 as well as Figure 11 and Figure 12As shown, the head shell 30 is fitted onto the damping member 50. The damping member 50 has an external spline 51, and the head shell 30 has an internal spline that mates with the external spline 51. The damping member 50 is configured to have a locked state and a rotating state. When the damping member 50 is in the rotating state, the internal spline mates with the external spline 51, and the head shell 30 drives the damping member 50 to rotate synchronously. When the damping member 50 is in the locked state, the internal spline mates with the external spline 51, and the damping member 50 restricts the rotation of the head shell 30. At this time, since the first guide surface 222 and the second guide surface 362 are in a beveled fit, and at least a portion of the structure of the first guide surface 222 has a component in the rotation direction of the spool 20, the first guide surface 222 pushes against the second guide surface 362, causing the head shell 30 to have a tendency to rotate relative to the spool 20. When the force on the head shell 30 along the longitudinal axis 1a is sufficient to overcome the elastic force of the spring 40, the first guide surface 222 passes over the second guide surface 362. During this process, the head shell 30 moves upward in the vertical direction and moves from the third axial position 34 to the fourth axial position 35, thereby disengaging the second limiting protrusion 22 from the second limiting recess 36, allowing the head shell 30 and the spool 20 to rotate relative to each other. After moving to the fourth axial position 35, the head shell 30 immediately returns to the third axial position 34 under the action of gravity.

[0083] Of course, in other embodiments, the head shell 30 may be provided with an external spline 51 and the damping member 50 may be provided with an internal spline, as long as the head shell 30 and the damping member 50 are splinedly connected.

[0084] like Figures 2 to 4 As shown, the trimmer head 1 also includes a locking member 60, which is configured to restrict the rotation of the damping member 50. The damping member 50 has an adaptation opening 52 that is adapted to the locking member 60. The locking member 60 is configured to move between a first position and a second position. When the locking member 60 is in the second position, it is located within the adaptation opening 52 and abuts against the damping member 50. Since the locking member 60 is in a fixed position, under the action of the abutting force of the locking member 60, the damping member 50 cannot rotate relative to the locking member 60, thus the damping member 50 is in a locked state. This application achieves the separation of the head shell 30 and the spool 20 by setting the locking member 60 to restrict the rotation of the damping member 50.

[0085] In this embodiment, the damping member 50 has four adapter openings 52. By providing multiple adapter openings 52, it is easier for the locking member 60 to enter the adapter openings 52. Of course, in other embodiments, the number of adapter openings 52 may be other values.

[0086] like Figures 2 to 4As shown, the trimmer head 1 also includes a reset member 70, which is fixedly connected to the locking member 60 and configured to move the locking member 60 from a second position to a first position. When the locking member 60 moves from the first position to the second position, the reset member 70 undergoes elastic deformation, or the deformation of the reset member 70 increases, so that when the locking member 60 is in the second position, the reset member 70 applies a restoring force to the locking member 60, so that the locking member 60 can automatically reset from the second position to the first position.

[0087] It should be noted that the locking member 60 can move between the first position and the second position, which should be understood as the locking member 60 being able to move between the first position and the second position relative to the damping member 50.

[0088] In some embodiments, the locking member 60 may be movable only between a first position and a second position. In other words, the first position and the second position are two extreme positions of movement of the locking member 60. In other embodiments, the second position is not the extreme position of the locking member 60, and the locking member 60 may continue to move in a direction from the first position to the second position and further extend into the adaptation opening 52 until it moves to its extreme position.

[0089] like Figures 2 to 4 As shown, the mowing head 1 includes a mowing switch (not shown) and a winding switch 80. In mowing mode C, the mowing head 1 operates at a first operating speed. When the mowing switch is turned on, the mowing head 1 rotates at the first operating speed. In winding mode A, the mowing head 1 operates at a second operating speed. When the winding switch 80 is turned on, the mowing head 1 rotates at the second operating speed. In this application, to reduce the space occupied by the winding switch 80, the winding switch 80 is inclined.

[0090] In this embodiment, in mowing mode C, the mowing rope 2 exposed on the mowing head 1 needs to rotate at high speed to generate sufficient cutting force to cut the weeds. However, in winding mode A, the spool 20 rotates too fast, which is not conducive to winding the mowing head 1. Therefore, the second operating speed is lower than the first operating speed.

[0091] like Figures 2 to 4 as well as Figure 13 and Figure 14As shown, the trimmer head 1 also includes a button 90, which is configured to move between a start position and an end position, with the end position closer to the locking member 60 relative to the start position. The button 90 includes a first portion 91 and a second portion 92. The first portion 91 is configured to push and open the winding switch 80. When the user presses and holds the button 90, moving it from the start position to the end position, the first portion 91 moves towards the winding switch 80 until it pushes and opens the winding switch 80, putting the trimmer head 1 in winding mode A, and the spool 20 rotates at a second operating speed. The second portion 92 is configured to push the locking member 60, causing it to move from a first position to a second position. During the movement of the button 90 from the start position to the end position, the second portion 92 moves towards the locking member 60 until it pushes the locking member 60, moving it from the first position to the second position, thus placing the locking member 60 within the adaptation opening 52 and abutting against the damping member 50, which is in a locked state. With this design, this application can keep the damping element 50 in a locked state and limit the rotation of the head shell 30 while the winding switch 80 is turned on.

[0092] In the above-described device, the first part 91 includes a first surface 911, which is configured to push against and open the winding switch 80. During the movement of the button 90 from the starting position to the ending position, the first surface 911 moves towards the winding switch 80 until it pushes against and opens the winding switch 80. The second part 92 includes a second surface 921, which is configured to push against a locking member 60, which moves from a first position to a second position. During the movement of the button 90 from the starting position to the ending position, the second surface 921 moves towards the locking member 60 until it pushes against the locking member 60 and moves the locking member 60 from the first position to the second position. In this embodiment, because the winding switch 80 is tilted, there is an angle α between the first surface 911 and the second surface 921. In actual design, the designer can design the size of the angle α according to the tilt angle of the winding switch 80.

[0093] It should be noted that the button 90 can move between a starting position and an ending position. This should be understood as the button 90 being able to move between a starting position and an ending position relative to the winding switch 80. The starting position and the ending position are the two extreme positions of the button 90's movement relative to the winding switch 80.

[0094] The automatic winding process of the grass trimmer head 1 is as follows: First, in the initial state, the inner threading hole 21 and the outer threading hole 31 of the grass trimmer head 1 are aligned. The grass trimmer rope 2 is passed through the outer threading hole 31 and then into the inner threading hole 21, so that the grass trimmer rope 2 crosses the grass trimmer head 1, and the two ends of the grass trimmer rope 2 extend out from the two outer threading holes 31 respectively. Then, when the user presses and holds the button 90 and moves the button 90 from the starting position to the ending position, the first surface 911 moves toward the winding switch 80 until it pushes and opens the winding switch 80, and the grass trimmer head 1 is in winding mode A. At this time, the drive device 10 drives the spool 20 to rotate at the second operating speed. At the same time, the second surface 921 moves toward the locking member 60 until it pushes the locking member 60 and moves the locking member 60 from the first position to the second position, so that the locking member 60 is located in the adaptation opening 52 and abuts against the damping member 50. The damping member 50 is in a locked state and restricts the rotation of the head shell 30. Subsequently, the head shell 30 and 20 rotate relative to each other. The spool 20 rotates at a second operating speed, while the head shell 30 is restricted from rotating by the damping element 50, and moves back and forth between the third axial position 34 and the fourth axial position. The limiting effect of the outer threading hole 31 on the trimming rope 2 causes the trimming rope 2 to gradually wind around the spool 20 as the outer threading hole 31 moves relative to the spool 20. Thus, in winding mode A, the user can automatically wind the trimming head 1 by pressing button 90, thus eliminating the need for the user to manually install the trimming rope 2 onto the trimming head 1.

[0095] The unwinding process of the straw trimmer 1 is the reverse of the winding process. When the rotational speed of the spool 20 is less than the rotational speed of the head shell 30, the straw trimmer 1 can automatically unwind the straw. To achieve this, the rotational speed of the spool 20 is less than that of the head shell 30, and the design of this application separates the spool 20 from both the drive device 10 and the head shell 30. Under the influence of inertia, the spool 20 and the head shell 30 rotate in the same direction, and under the centrifugal force of the straw trimmer rope 2, the rotational speed of the spool 20 is less than that of the head shell 30, thus enabling the straw trimmer 1 to automatically unwind the straw.

[0096] This application achieves the separation between the spool 20 and the drive device 10 by designing a transmission component 200.

[0097] like Figures 2 to 4 As shown, the hay-beating head 1 also includes a striking cap 100. The striking cap 100 and the head shell 30 move synchronously in the direction of the longitudinal axis 1a. In other words, changing the position of the striking cap 100 will cause the head shell 30 to move along with it, meaning that the head shell 30 will change its axial position due to striking the striking cap 100. During the movement of the head shell 30 along the longitudinal axis 1a, after the head shell 30 has moved to a certain position, it separates from the spool 20.

[0098] like Figures 2 to 4As shown, the trimmer head 1 also includes a transmission component 200, which is fixedly connected to the drive device 10 and configured to drive the bobbin 20 to rotate synchronously. By providing the transmission component 200, the drive device 10 and the bobbin 20 can be separated.

[0099] In actual operation, after the spool 20 separates from the head shell 30, the spool 20 can move along the longitudinal axis 1a under the action of the transmission component 200. When the spool 20 is in the first axial position 23, the transmission component 200 abuts against the spool 20 to drive the spool 20 to rotate synchronously; when the spool 20 is in the second axial position 24, the spool 20 separates from the transmission component 200.

[0100] It should be noted that the aforementioned spool 20 can move between the first axial position 23 and the second axial position 24, which should be understood as the spool 20 being able to move relative to the transmission member 200 between the first axial position 23 and the second axial position 24.

[0101] In some embodiments, the spool 20 can only move between a first axial position 23 and a second axial position 24. In other words, the first axial position 23 and the second axial position 24 are the two extreme positions of the spool 20's movement. When the spool 20 moves to the second axial position 24, the spool 20 no longer moves in the direction from the first axial position 23 to the second axial position 24.

[0102] In some embodiments, the second axial position 24 is not the extreme position of the spool 20. The spool 20 will first move from the first axial position 23 to the second axial position 24, and then move further in the direction from the first axial position 23 to the second axial position 24, until it reaches the extreme position.

[0103] Specifically, in combination Figure 15 and Figure 16The transmission component 200 includes a transmission part 210, which has a first limiting protrusion 211. The spool 20 includes a transmission cavity 26 adapted to the transmission part 210, and the inner wall surface of the transmission cavity 26 has a first limiting recess 25 adapted to the first limiting protrusion 211. When the spool 20 is in the first axial position 23, the transmission part 210 is accommodated in the transmission cavity 26, and the outer wall surface of the transmission part 210 is in contact with the inner wall surface of the transmission cavity 26. The first limiting protrusion 211 and the first limiting recess 25 are adapted to each other, so that when the driving device 10 drives the transmission part 210 to rotate, the transmission part 210 drives the spool 20 to rotate synchronously. When the spool 20 is in the second axial position 24, at least a portion of the transmission part 210 is moved away from the transmission cavity 26, and the outer wall surface of the transmission part 210 separates from the inner wall surface of the transmission cavity 26. The first limiting protrusion 211 separates from the first limiting recess 25, thereby separating the spool 20 from the transmission member 200. Of course, in other embodiments, the spool 20 may be provided with the first limiting protrusion 211, and the transmission member 200 may be provided with the first limiting recess 25, as long as one of the first limiting protrusion 211 and the first limiting recess 25 is provided on the spool 20, and the other of the first limiting protrusion 211 and the first limiting recess 25 is provided on the transmission member 200.

[0104] like Figure 15 and Figure 16 As shown, in the direction from the first axial position 23 to the second axial position 24, the transmission part 210 includes a first end 212 and a second end 213 disposed opposite to each other. The direction from the first end 212 to the second end 213 is consistent with the direction from the first axial position 23 to the second axial position 24. The outer contour of the cross-section of the first end 212 is larger than the outer contour of the cross-section of the second end 213. With this design, when the spool 20 moves to the second axial position 24, the spool 20 can disengage from the transmission part 210.

[0105] In one embodiment, at least a portion of the outer contour of the cross-section of the transmission part 210 can remain unchanged in the direction from the first axial position 23 to the second axial position 24. In other words, from the first end 212 to the second end 213, the outer contour of the cross-section of the transmission part 210 can first remain unchanged and then decrease, or first decrease and then remain unchanged, as long as the outer contour of the cross-section of the first end 212 is greater than the outer contour of the cross-section of the second end 213.

[0106] like Figure 15 and Figure 16As shown, in this embodiment, the outer contour of the cross-section of the transmission part 210 gradually decreases from the first axial position 23 to the second axial position 24. This "smaller at the top, larger at the bottom" design allows the spool 20 to separate from the transmission part 210 with only a small displacement in the direction from the first axial position to the second axial position 24, thus facilitating the separation of the transmission part 210 from the spool 20.

[0107] The automatic line feeding process of the mowing head 1 is as follows: In mowing mode C, the user taps the tapping cap 100. The tapping cap 100 contacts the ground, causing the head shell 30 to move along the longitudinal axis 1a. This separates the second limiting recess 36 from the second limiting protrusion 22, separating the head shell 30 from the spool 20. The head shell 30 and the spool 20 can then rotate relative to each other. Subsequently, under the action of the transmission component 200, the spool 20 can move along the longitudinal axis 1a. When the spool 20 moves to the second axial position 24, the spool 20 separates from the drive device 10, and the spool 20 and the drive device 10 can rotate relative to each other. When the spool 20, the head shell 30, and the drive device 10 are all separated, the head shell 30 and the spool 20 maintain rotation in the same direction under the action of inertia. However, under the centrifugal force of the trimming rope 2, the rotation speed of the spool 20 is less than that of the head shell 30, causing a portion of the trimming head 1 wound on the spool 20 to be released outside the head shell 30, and the trimming head 1 is in the line release mode B. Therefore, in trimming mode C, the user can release an appropriate amount of trimming rope 2 by tapping the tapping cap 100, thus eliminating the need to stop the trimmer and manually release the line.

[0108] The hay-trimming head disclosed in this application has a winding mode and a releasing mode. It replaces the traditional manual winding and releasing with automatic winding and releasing, achieving intelligent winding and releasing, thus saving manpower. Furthermore, in the above device, the drive unit does not need to rotate in either direction; it only needs to rotate in one direction to achieve automatic winding and releasing. Therefore, this application avoids the problem of loose nuts and eliminates the need for adding anti-loosening adhesive to secure the nuts.

[0109] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A type of grass trimming head, characterized in that, It includes: A spool and a head cover fitted over the spool; The grass-cutting head has a winding mode and a releasing mode; In the winding mode, the head shell remains stationary, while the spool rotates relative to the head shell, and the straw rope is wound onto the spool. The hay-trimming head also includes a transmission component. In the line-laying mode, the hay-trimming head rotates in the same direction as in the line-winding mode. The spool is separated from the drive device through the transmission component. The spool is separated from the head shell. Under the action of the centrifugal force of the hay-trimming rope, the rotational speed of the spool is less than the rotational speed of the head shell, and both the spool and the head shell move to a powerless position to release the hay-trimming rope. The transmission component is configured to drive the spool to rotate synchronously; the spool is configured to move along a longitudinal axis and to move between a first axial position and a second axial position; when the spool is at the first axial position, the transmission component abuts against the spool to drive the spool to rotate synchronously; when the spool is at the second axial position, the spool separates from the transmission component. The transmission component includes a transmission part, and the spool includes a transmission cavity adapted to the transmission part; when the spool is located in the first axial position, the transmission part is accommodated in the transmission cavity, and the outer wall surface of the transmission part is in contact with the inner wall surface of the transmission cavity; when the spool is located in the second axial position, at least a portion of the transmission part is moved away from the transmission cavity, and the outer wall surface of the transmission part is separated from the inner wall surface of the transmission cavity.

2. The hay trimmer as described in claim 1, characterized in that, In the winding mode, the spool rotates while the head shell is restricted from rotating.

3. The hay trimmer as described in claim 1, characterized in that, The transmission part includes a first end and a second end disposed opposite to each other, and the direction from the first end to the second end is consistent with the direction from the first axial position to the second axial position. The outer contour of the cross-section of the first end is larger than the outer contour of the cross-section of the second end.

4. The hay trimmer as described in claim 3, characterized in that, From the first axial position to the second axial position, the outer contour of the cross-section of the transmission part gradually decreases.

5. The hay trimmer as described in claim 3, characterized in that, The grass trimmer includes a first limiting protrusion and a first limiting recess that are adapted to each other; one of the first limiting protrusion and the first limiting recess is disposed in the transmission part, and the other of the first limiting protrusion and the first limiting recess is disposed in the transmission cavity. When the spool is in the first axial position, the first limiting protrusion and the first limiting recess are adapted to each other, and the transmission part drives the spool to rotate synchronously. When the spool is in the second axial position, the first limiting protrusion separates from the first limiting recess.

6. The hay trimmer as described in claim 1, characterized in that, The head shell is configured to move along a longitudinal axis and to move between a third axial position and a fourth axial position; When the head shell is in the third axial position, the spool abuts against the head shell to drive the head shell to rotate synchronously; When the head shell is located at the fourth axial position, the head shell separates from the spool.

7. The hay trimmer as described in claim 6, characterized in that, The hay-cutting head includes a matching second limiting protrusion and a second limiting recess; one of the second limiting protrusion and the second limiting recess is disposed on the head shell, and the other of the second limiting protrusion and the second limiting recess is disposed on the spool. When the head shell is located in the third axial position, the second limiting protrusion and the second limiting recess are adapted to each other, and the spool drives the head shell to rotate synchronously. When the head shell is located in the fourth axial position, the second limiting protrusion separates from the second limiting recess.

8. The hay trimmer as described in claim 7, characterized in that, The second limiting protrusion includes a first guide surface and a first stop surface; the first stop surface extends in a direction from the third axial position to the fourth axial position, and the first stop surface is configured to restrict the spool from rotating in a first rotation direction; the first guide surface includes a connecting end and an extending end, the connecting end is connected to the first stop surface, and the first guide surface is inclined in a direction from the connecting end to the extending end. The second limiting recess includes a second guide surface and a second stop surface, wherein the second guide surface is adapted to the first guide surface and the second stop surface is adapted to the first stop surface; When the head shell is located at the third axial position, the first guide surface abuts against the second guide surface, and the spool drives the head shell to rotate synchronously.

9. The hay trimmer as described in claim 8, characterized in that, The tilt direction of at least a portion of the structure of the first guide surface has a component in the rotation direction of the spool.

10. The hay trimmer as described in claim 9, characterized in that, The hay-trimming head also includes a damping element, which is splinedly connected to the head shell and configured to limit the rotation of the head shell; The damping element is configured to have a locked state and a rotating state. When the damping element is in the locked state, the damping element restricts the rotation of the head shell. When the damping element is in the rotating state, the head shell drives the damping element to rotate synchronously.

11. The hay trimmer as described in claim 10, characterized in that, The grass trimmer also includes a locking element configured to restrict the rotation of the damping element; The damping member has an adaptation opening that is adapted to the locking member. The locking member is configured to move between a first position and a second position. When the locking member is in the second position, the locking member is located within the adaptation opening, restricting the rotation of the damping member, and the damping member is in the locking state.

12. The hay trimmer as described in claim 11, characterized in that, The grass trimmer also includes a reset component, which is fixedly connected to the locking component and configured to move the locking component from the second position to the first position.

13. A working head, characterized in that, The grass trimmer head includes any one of claims 1-12, and includes a drive device configured to drive the grass trimmer head to rotate.

14. A lawn mower, characterized in that, The lawn mower includes a mowing head as described in any one of claims 1-12, and includes a drive device configured to drive the mowing head to rotate. The lawn mower also includes an operating device for user operation to control the lawn mower.

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