Hair trimmer

Abstract

The embodiment of the utility model discloses a hair trimmer which comprises a first movement unit, a second movement unit and a driving mechanism. The first movement unit comprises a first tool bit assembly and a first transmission assembly, and the first transmission assembly is in transmission connection with the driving mechanism and the first tool bit assembly; the second movement unit comprises a second tool bit assembly and a second transmission assembly, and the second transmission assembly is in transmission connection with the driving mechanism and the second tool bit assembly; the first tool bit assembly comprises at least two first tool bits, the second tool bit assembly comprises at least one second tool bit, and the number of the first tool bits is larger than that of the second tool bits; the mass of the first transmission assembly is smaller than that of the second transmission assembly. According to the hair trimmer, the mass of the first transmission assembly is smaller than that of the second transmission assembly, so that the mass difference of the two movement units is reduced, mechanical unbalance and vibration caused by overweight of one side are avoided, vibration can be effectively reduced, and the comfort level of a user when the user uses the hair trimmer is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hair trimming, and in particular to a hair trimmer. Background Art

[0002] Multi-head hair trimmers have multiple cutting heads, which can effectively expand the trimming area and are suitable for a variety of trimming scenarios, such as trimming long and short hair at the same time. However, when multiple cutting heads are driven synchronously, the large vibration amplitude can reduce the user's grip comfort.

[0003] Existing technologies typically use two transmission assemblies, each connecting two cutter head assemblies of equal mass, and moving them in opposite directions to reduce vibration. However, when there is an odd number of cutter heads or the masses of the cutter heads vary, the mass difference between the cutter head assemblies connected by the two transmission assemblies is large, which can still cause strong vibration.

[0004] The above content is only used to assist in understanding the technical solution of the utility model and does not constitute an admission that the above content is prior art. Utility Model Content

[0005] In view of the above problems, the present invention proposes a hair trimmer, which aims to solve the technical problem that strong vibrations will still be generated when the number of blades is odd or the masses of the blades are different.

[0006] To achieve the above-mentioned purpose, the hair trimmer proposed by the present invention comprises: a first motion unit, a second motion unit and a driving mechanism; wherein,

[0007] The first motion unit includes a first cutter head assembly and a first transmission assembly, wherein the first transmission assembly is in transmission connection with the drive mechanism and the first cutter head assembly; the second motion unit includes a second cutter head assembly and a second transmission assembly, wherein the second transmission assembly is in transmission connection with the drive mechanism and the second cutter head assembly;

[0008] The first cutter head assembly includes at least two first cutter heads, the second cutter head assembly includes at least one second cutter head, and the number of the first cutter heads is greater than the number of the second cutter heads;

[0009] The mass of the first transmission assembly is smaller than the mass of the second transmission assembly.

[0010] In one embodiment, the driving mechanism includes a first moving member and a second moving member, the first transmission assembly is connected to the first moving member, and the second transmission assembly is connected to the second moving member.

[0011] In one embodiment, the mass of the first moving member is smaller than the mass of the second moving member.

[0012] In one embodiment, the first moving member includes a first mounting frame and a first permanent magnet disposed on the first mounting frame, and the first transmission assembly is fixedly connected to the first mounting frame;

[0013] The second moving part includes a second mounting frame and a second permanent magnet arranged on the second mounting frame, and the second transmission assembly is fixedly connected to the second mounting frame.

[0014] In one embodiment, the mass of the first mounting bracket is smaller than the mass of the second mounting bracket.

[0015] In one embodiment, the first mounting bracket includes a first mounting block fixedly connected to the first transmission assembly, and the second mounting bracket includes a second mounting block fixedly connected to the second transmission assembly, and the thickness of the second mounting block is greater than that of the first mounting block.

[0016] In one embodiment, the first transmission assembly includes a first transmission base and at least two first transmission rods connected to the first transmission base, the first transmission base is connected to the first mounting frame, and each of the first transmission rods is connected to the first cutting head;

[0017] The second transmission assembly includes a second transmission seat and at least one second transmission rod connected to the second transmission seat, the second transmission seat is connected to the second mounting bracket, and each second transmission rod is respectively connected to the second cutter head.

[0018] In one embodiment, the mass of the first transmission base is smaller than the mass of the second transmission base, or the total mass of the first transmission base and the first moving member is smaller than the total mass of the second transmission base and the second moving member.

[0019] In one embodiment, the first transmission seat includes a first base plate fixedly connected to the first mounting frame, the second transmission seat includes a second base plate and a counterweight wall protruding from the second base plate, the second base plate is fixedly connected to the second mounting frame, the counterweight wall is located on the side wall of the second mounting frame, and the mass of the first transmission seat is less than the mass of the second transmission seat.

[0020] In one embodiment, the second transmission base includes two counterweight walls, and the two counterweight walls are located on opposite sides of the second mounting frame.

[0021] In one embodiment, the two counterweight walls include a first wall and a second wall, the first wall is located on a side of the second mounting frame close to the first mounting frame, the second wall is located on the other side opposite to the second mounting frame, and the thickness of the first wall is greater than the thickness of the second wall.

[0022] In one embodiment, the thickness of the first bottom plate is smaller than the thickness of the second bottom plate.

[0023] In one embodiment, the first mounting bracket includes a first mounting block and two mounting protrusions protruding from a wall surface of the first mounting block close to the first base plate, a clearance space adapted to the mounting protrusions is formed on a wall surface of the first base plate close to the first mounting bracket; two connecting protrusions are protruding from a wall surface of the first base plate facing away from the first mounting bracket, and the connecting protrusions are arranged corresponding to the clearance spaces;

[0024] The first motion unit further includes a fastener, which is passed through the connecting protrusion and the mounting protrusion to fix the first transmission seat and the first mounting bracket.

[0025] In one embodiment, the first cutter head assembly and the second cutter head assembly are arranged side by side;

[0026] The first transmission assembly and the second transmission assembly reciprocate along a preset direction, and the movement directions of the first transmission assembly and the second transmission assembly are opposite.

[0027] In one embodiment, the at least two first blade heads include a long-beard blade head and a first short-beard blade head, the at least one second blade head includes a second short-beard blade head, and the long-beard blade head is arranged between the first short-beard blade head and the second short-beard blade head.

[0028] The hair trimmer of the present invention is configured to have a first blade assembly including at least two first blades and a second blade assembly including at least one second blade. This allows the hair trimmer to adapt to different trimming needs and can trim both long and short hair simultaneously. Furthermore, the provision of multiple blades can expand the trimming area, thereby improving trimming efficiency. Secondly, the number of first blades is greater than the number of second blades, resulting in the mass of the first blade assembly being greater than the mass of the second blade assembly. The hair trimmer of the present invention reduces the mass difference between the first and second motion units by configuring the mass of the first transmission assembly to be smaller than the mass of the second transmission assembly, thereby balancing the driving force in the system and avoiding mechanical imbalance and vibration caused by excessive weight on one side. This can effectively reduce vibration and enhance user comfort when using the hair trimmer.

[0029] In addition, by optimizing the mass of the first transmission assembly and the second transmission assembly to achieve the counterweight balance between the first motion unit and the second motion unit, only one-time design and adjustment are required to achieve the counterweight balance between the two, reducing the independent adjustment and maintenance work for each cutter head and reducing the complexity of system design and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic structural diagram of an embodiment of a hair trimmer of the present utility model is shown;

[0032] Figure 2 for Figure 1 Exploded view of the structure of the medium hair trimmer;

[0033] Figure 3 for Figure 1 Another exploded view of the structure of the medium hair trimmer;

[0034] Figure 4 for Figure 1 Cross-sectional view of a medium hair trimmer;

[0035] Figure 5 for Figure 4 Exploded view of the medium hair trimmer;

[0036] Figure 6 for Figure 3 A schematic structural diagram of the first transmission assembly and the first moving part;

[0037] Figure 7 for Figure 3 Schematic diagram of the structure of the second transmission assembly and the second moving part.

[0038] Description of Figure Numbers:

[0039] Label name Label name Label name 100 hair trimmer 200 First motion unit 210 First cutter head assembly 211 First cutter head 220 First transmission assembly 224 First transmission seat 225 First base plate 225a Avoidance space 226 First transmission rod 227 Connecting convex part 227a Connection slot 228 fastener 300 Second motion unit 310 Second cutter head assembly 311 Second cutting head 320 Second transmission assembly 324 Second transmission seat 325 Second base plate 326 Counterweight wall 327 First wall 328 Second wall 329 Second transmission rod 400 Drive mechanism 410 First driving member 420 Second driving member 430 First moving part 431 First mounting bracket 432 First permanent magnet 433 First mounting block 434 Mounting convex part 440 Second moving part 441 Second mounting bracket 442 Second permanent magnet 443 Second mounting block 444 Mounting lugs

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that meet both A and B.

[0044] The present invention provides a hair trimmer 100 , which may be an electric shaver, a hair clipper, or the like.

[0045] In the embodiment of this utility model, please refer to Figures 1 to 7 The hair trimmer 100 includes a first motion unit 200, a second motion unit 300 and a driving mechanism 400; wherein the first motion unit 200 includes a first cutter head assembly 210 and a first transmission assembly 220, and the first transmission assembly 220 is transmission-connected to the driving mechanism 400 and the first cutter head assembly 210; the second motion unit 300 includes a second cutter head assembly 310 and a second transmission assembly 320, and the second transmission assembly 320 is transmission-connected to the driving mechanism 400 and the second cutter head assembly 310; the first cutter head assembly 210 includes at least two first cutter heads 211, and the second cutter head assembly 310 includes at least one second cutter head 311, and the number of first cutter heads 211 is greater than the number of second cutter heads 311; the mass of the first transmission assembly 220 is less than the mass of the second transmission assembly 320.

[0046] In this embodiment, the drive mechanism 400 includes but is not limited to a linear motor and its mover. The drive mechanism 400 is used to provide a driving force to drive the first motion unit 200 and the second motion unit 300 to move, wherein the first motion unit 200 and the second motion unit 300 respectively include a first blade assembly 210 and a second blade assembly 310 for contacting the skin and trimming hair. The first blade assembly 210 includes two first blades 211, which are suitable for trimming long hair and short hair. The second blade assembly 310 includes one second blade 311, which is suitable for trimming short hair or long hair. In other embodiments, the first blade assembly 210 may also include three, four, or more first blades 211, and the second blade assembly 310 may also include two, three, or more second blades 311 to meet different trimming needs.

[0047] The first transmission assembly 220 and the second transmission assembly 320 are used to respectively connect the movers of the driving mechanism 400 to respectively drive the first cutter head assembly 210 and the second cutter head assembly 310 to move, thereby acting as a transmission bridge. The first transmission assembly 220 may include a transmission shaft, and the second transmission assembly 320 may include a transmission shaft and a counterweight block, so that the mass of the first transmission assembly 220 and the second transmission assembly 320 matches the mass of the first cutter head assembly 210 and the second cutter head assembly 310. The provision of the counterweight block can effectively reduce the difficulty of counterweight balancing. For example, if the mass of the first cutter head assembly 210 exceeds the mass of the second cutter head assembly 310, a counterweight block of a corresponding mass can be added to the second transmission assembly 320 to achieve counterweight balance of the first motion unit 200 and the second motion unit 300.

[0048] The hair trimmer 100 of the present invention utilizes a first cutter head assembly 210 comprising at least two first cutter heads 211 and a second cutter head assembly 310 comprising at least one second cutter head 311, allowing the hair trimmer 100 to adapt to different trimming needs and simultaneously trim both long and short hair. Furthermore, the multiple cutter heads expand the trimming area, thereby improving trimming efficiency. Furthermore, the greater number of first cutter heads 211 than the number of second cutter heads 311 results in the first cutter head assembly 210 being heavier than the second cutter head assembly 310. By configuring the first transmission assembly 220 to have a smaller mass than the second transmission assembly 320, the hair trimmer 100 of the present invention reduces the mass difference between the first motion unit 200 and the second motion unit 300, balancing the driving force in the system and avoiding mechanical imbalance and vibration caused by excessive weight on one side. This effectively reduces vibration, enhances user comfort while using the hair trimmer 100, and reduces noise.

[0049] In addition, by optimizing the mass of the first transmission assembly 220 and the second transmission assembly 320 to achieve weight balance between the first motion unit 200 and the second motion unit 300, only one-time design and adjustment is required to achieve weight balance between the two, reducing the need for independent adjustment and maintenance of each cutter head and reducing the complexity of system design and maintenance. For example, the first cutter head 211 and the second cutter head 311 can be mass-produced, ensuring consistency between the first cutter head 211 and the second cutter head 311 and improving production efficiency. Furthermore, as needed, at least two first cutter heads 211 are provided in the first cutter head assembly 210, and at least one second cutter head 311 is provided in the second cutter head assembly 310. Only the total mass of the first cutter head assembly 210 and the total mass of the second cutter head assembly 310 need to be calculated, and then the mass of the first transmission assembly 220 and the second transmission assembly 320 need to be calculated and designed to achieve weight balance between the first motion unit 200 and the second motion unit 300. Moreover, the cutter head usually needs to consider multiple functions, such as cutting, adjustment, etc. Achieving counterweight balance on the first cutter head assembly 210 and the second cutter head assembly 310 will increase the design difficulty and complexity. The design of the transmission assembly is relatively simple, and achieving counterweight balance on it can reduce the design difficulty.

[0050] In one embodiment, reference Figures 3 to 7 The driving mechanism 400 includes a first moving member 430 and a second moving member 440 , the first transmission assembly 220 is connected to the first moving member 430 , and the second transmission assembly 320 is connected to the second moving member 440 .

[0051] In this embodiment, the driving mechanism 400 also includes a driving assembly for driving the first moving member 430 and the first moving member 430. The driving assembly can be a driving member that drives the first moving member 430 and the first moving member 430 to move simultaneously, or it can be two driving members that drive the first moving member 430 and the first moving member 430 respectively, and the two driving members are respectively arranged corresponding to the first moving member 430 and the first moving member 430. The first moving member 430 and the second moving member 440 serve as movers of the driving mechanism 400, including but not limited to permanent magnets. The driving assembly includes a coil for generating a changing electromagnetic field when power is applied to move the first moving member 430 and the second moving member 440. Among them, the first moving member 430 is used to connect to the first transmission assembly 220 to drive the first cutter head assembly 210 to move, and the second moving member 440 is used to connect to the second transmission assembly 320 to drive the second cutter head assembly 310 to move.

[0052] Furthermore, the mass of the first moving part 430 is less than the mass of the second moving part 440. In this embodiment, on the basis that the mass of the first transmission component 220 is less than the mass of the second transmission component 320, the first moving part 430 and the second moving part 440 are counterbalanced, that is, the mover of the driving mechanism 400 is counterbalanced, thereby increasing the counterbalance method. If the limit value of the mass of the first transmission component 220 and the second transmission component 320 is adjusted and the ideal balance state is still not achieved, the mass of the first moving part 430 and the second moving part 440 can be further adjusted to avoid the limitation of a single method causing the mass difference between different loads of the driving part to be too large. Secondly, the mover structure of the driving mechanism 400 is relatively simple, and the mass distribution is easy to adjust. Achieving counterbalance on it can reduce the design difficulty.

[0053] Specifically, the first moving member 430 includes a first mounting frame 431 and a first permanent magnet 432 disposed on the first mounting frame 431, and the first transmission assembly 220 is fixedly connected to the first mounting frame 431. The second moving member 440 includes a second mounting frame 441 and a second permanent magnet 442 disposed on the second mounting frame 441, and the second transmission assembly 320 is fixedly connected to the second mounting frame 441. In this embodiment, the first permanent magnet 432 and the second permanent magnet 442 can be fixedly mounted on the first mounting frame 431 and the second mounting frame 441, respectively, by bonding, clamping, or other means, so as to reciprocate under the action of the changing electromagnetic field generated by the drive assembly, thereby driving the first blade assembly 210 and the second blade assembly 310 to perform a trimming action.

[0054] The mass of first mounting frame 431 is smaller than that of second mounting frame 441. The materials of first mounting frame 431 and second mounting frame 441 can be the same or different. To reduce the difficulty of balancing the weight of first mounting frame 431 and second mounting frame 441, first mounting frame 431 and second mounting frame 441 are typically made of the same material. The mass of first mounting frame 431 is reduced to that of second mounting frame 441 by varying the dimensions of first mounting frame 431 and second mounting frame 441. When first mounting frame 431 and second mounting frame 441 have the same dimensions but different materials, first mounting frame 431 can be made of a lightweight material, such as aluminum alloy, while second mounting frame 441 can be made of a heavier material, such as steel or copper, to ensure that the mass of first mounting frame 431 is reduced to that of second mounting frame 441.

[0055] Since the mass of a permanent magnet is usually closely related to its magnetic properties. By adjusting the mass on the mounting frame, it is possible to avoid changing the structure and material of the permanent magnet itself, thereby maintaining its original magnetic field strength and uniformity. This ensures that the electromagnetic performance of the drive mechanism 400 will not be adversely affected by the counterweight adjustment, thereby ensuring the drive efficiency and stability of the system. Secondly, the structure of the mounting frame is usually relatively simple, and a variety of materials and structural designs can be used. Therefore, mass adjustment on the mounting frame is more flexible. For example, the mass can be easily adjusted by selecting different materials or adding counterweights, without involving the complex manufacturing process of the permanent magnet. This flexibility makes counterweight adjustment more convenient and quick, reducing the complexity of design and manufacturing.

[0056] Furthermore, the first mounting bracket 431 includes a first mounting block 433 fixedly connected to the first transmission assembly 220, and the second mounting bracket 441 includes a second mounting block 443 fixedly connected to the second transmission assembly 320, and the thickness of the second mounting block 443 is greater than the thickness of the first mounting block 433.

[0057] In this embodiment, the shapes of the first mounting block 433 and the second mounting block 443 can be the same or different. In order to more accurately and efficiently control the quality of the first mounting block 433 and the second mounting block 443, the first mounting block 433 and the second mounting block 443 of the same shape are usually used.

[0058] This embodiment changes the thickness of the first mounting block 433 and the second mounting block 443 so that the mass of the first mounting frame 431 is less than the mass of the second mounting frame 441, thereby more accurately controlling the mass difference. By fine-tuning the thickness, a small mass increase or decrease can be achieved, while changing the material may cause a large mass change, which is difficult to accurately control. Secondly, thickness adjustment does not require additional materials or complex processes, which can effectively control manufacturing costs. For example, changing the thickness usually only requires adjusting the cutting or molding process of the material, while changing the material may require redesigning the mold or process flow, increasing manufacturing complexity. At the same time, by adjusting the mass by changing the thickness, quality differences can be achieved while maintaining the strength and rigidity of the material, while changing the material may affect the structural strength and rigidity of the component.

[0059] In one embodiment, the first transmission assembly 220 includes a first transmission seat 224 and at least two first transmission rods 226 connected to the first transmission seat 224, the first transmission seat 224 is connected to the first mounting bracket 431, and each first transmission rod 226 is respectively connected to the first cutter head 211; the second transmission assembly 320 includes a second transmission seat 324 and at least one second transmission rod 329 connected to the second transmission seat 324, the second transmission seat 324 is connected to the second mounting bracket 441, and each second transmission rod 329 is respectively connected to the second cutter head 311; the mass of the first transmission assembly 220 is less than the mass of the second transmission assembly 320.

[0060] In this embodiment, there are two first transmission rods 226 and one second transmission rod 329. The first transmission assembly 220 also includes a first connecting base, wherein one first transmission rod 226 is integrally formed with the first transmission base 224, and the other first transmission rods 226 are disposed on the first connecting base. The first connecting base is then sleeved onto the first transmission rod 226 integrally formed with the first transmission base 224, so that at least two first transmission rods 226 are arranged side by side and spaced apart. This arrangement allows the first transmission rods 226 to provide stronger and more stable support for the first cutting heads 211, thereby ensuring smooth operation of the multiple first cutting heads 211. The first connecting base and the other first transmission rods 226 can be made of plastic to reduce weight. To reduce the total mass of the first transmission rod 226 and the first connecting base and the mass difference between the second transmission rod 329, the second transmission assembly 320 includes a second connecting base, wherein one second transmission rod 329 is integrally provided with the second transmission base 324, and the second connecting base is sleeved on the second transmission rod 329 integrally provided with the second transmission base 324. If the number of second transmission rods 329 is two or more, the other second transmission rods 329 can be provided on the second connecting base. The second connecting base and the other second transmission rods 329 can also be made of plastic to reduce mass. In other embodiments, multiple transmission rods for connecting the cutter head can be integrally formed, or other transmission rod configuration methods can be adopted, which will not be repeated here.

[0061] In this embodiment, the first transmission rod 226 and the second transmission rod 329 may have the same mass, and the first transmission base 224 may have a smaller mass than the second transmission base 324. Alternatively, the first transmission base 224 and the second transmission base 324 may have the same mass, and the first transmission rod 226 may have a smaller mass than the second transmission rod 329. Alternatively, the first transmission base 224 and the second transmission base 324 may have different masses, and the first transmission rod 226 and the second transmission rod 329 may have different masses, so long as the total mass of the first transmission base 224 and the first transmission rod 226 is smaller than the total mass of the second transmission base 324 and the second transmission rod 329. For example, if the number of first transmission rods 226 is greater than the number of second transmission rods 329, and if the same material is used, the mass of at least two first transmission rods 226 may be greater than the mass of at least one second transmission rod 329. In this case, the mass of the first transmission base 224 can be reduced so that the mass of the first transmission assembly 220 is greater than the mass of the second transmission assembly 320. This approach provides greater flexibility in counterweight design.

[0062] Specifically, the mass of the first transmission base 224 is smaller than the mass of the second transmission base 324 , or the total mass of the first transmission base 224 and the first moving member 430 is smaller than the total mass of the second transmission base 324 and the second moving member 440 .

[0063] In this embodiment, the mass of the first transmission seat 224 is set to be smaller than the mass of the second transmission seat 324, so that the mass of the first transmission assembly 220 is smaller than the mass of the second transmission assembly 320, making the counterweight simpler and more accurate. Since the number of the two sets of transmission rods is inconsistent, if the counterweight is balanced on the transmission rod, it is necessary to consider the structure and material issues, resulting in a more complicated design, which is not conducive to improving production efficiency.

[0064] Secondly, there are various implementations for making the total mass of the first transmission base 224 and the first moving member 430 less than the total mass of the second transmission base 324 and the second moving member 440. For example, when the masses of the first transmission base 224 and the second transmission base 324 are the same, the mass of the first moving member 430 is less than the mass of the second moving member 440. When the mass of the first transmission base 224 is less than the mass of the second transmission base 324, the mass of the first moving member 430 and the mass of the second moving member 440 can be the same or different. When the mass of the first transmission base 224 is greater than the mass of the second transmission base 324, the mass of the first moving member 430 is less than the mass of the second moving member 440. This approach makes the counterweight design more flexible, and counterweight balance can be achieved through multiple components, avoiding the situation where a single component is too heavy and causes damage to its load-bearing components.

[0065] Specifically, the first transmission seat 224 includes a first base plate 225 connected to the first mounting frame 431, the second transmission seat 324 includes a second base plate 325 and a counterweight wall 326 protruding from the second base plate 325, the second base plate 325 is fixedly connected to the second mounting frame 441, the counterweight wall 326 is located on the side wall of the second mounting frame 441, and the mass of the first transmission seat 224 is less than the mass of the second transmission seat 324.

[0066] In this embodiment, the first base plate 225 and the second base plate 325 may be square, circular, or other shapes. The masses of the first base plate 225 and the second base plate 325 may be the same or different, without limitation. Compared to the first transmission base 224, the second transmission base 324 further includes a counterweight wall 326. This reduces the mass of the first transmission base 224, thereby reducing the mass of the first transmission assembly 220 and the second transmission assembly 320. This reduces vibration between the first and second motion units 200 and 300. One or more counterweight walls 326 may be provided. When there is only one counterweight wall 326, it may be located on the side wall of the second mounting frame 441 near the first mounting frame 431. This allows the weight of the counterweight wall 326 to be applied to the center of the hair trimmer 100, reducing vibration and preventing the weight of the counterweight wall 326 from acting on the side walls, which could cause an imbalance in the force applied to the second transmission assembly 320 and increase vibration, thereby generating noise.

[0067] When multiple counterweight walls 326 are provided, each counterweight wall 326 can be located on the sidewall of the second mounting frame 441. This allows the counterweight walls 326 to have a larger volume and greater mass, thereby reducing the mass difference between the first motion unit 200 and the second motion unit 300, thereby reducing vibration. By reducing vibration, user comfort when using the device is greatly improved, making the grip more stable and less prone to fatigue.

[0068] Furthermore, the second transmission base 324 includes two counterweight walls 326 , and the two counterweight walls 326 are located on opposite sides of the second mounting frame 441 .

[0069] In this embodiment, compared to the first transmission seat 224, the second transmission seat 324 also includes two counterweight walls 326, so that the adjustable mass range is larger. The two counterweight walls 326 can be arranged on any two opposite sides of the second mounting frame 441, and there is no restriction here. The mass of the two counterweight walls 326 can be the same or different. When the mass of the two counterweight walls 326 is the same, the two counterweight walls 326 are arranged on opposite sides of the second mounting frame 441. This symmetrical design helps to evenly distribute the weight, thereby maintaining the balance of the overall structure and reducing the generation of eccentric force. Secondly, the symmetrical distribution of the counterweight walls 326 can better balance the force on the second transmission assembly 320 and avoid structural instability caused by excessive force on one side.

[0070] When the masses of the two counterweight walls 326 are different, the counterweight wall 326 with a larger mass can be arranged on the side wall of the second mounting frame 441 close to the first mounting frame 431, so that the main weight of the counterweight wall 326 is applied to the middle part of the hair trimmer 100, thereby making the overall center of gravity more concentrated. The position close to the center can better balance the force, avoiding the tilting problem caused by the main weight of the counterweight wall 326 being applied to the side of the hair trimmer 100.

[0071] Furthermore, the second installation block 443 is in an elongated strip shape, and the two counterweight walls 326 are located on opposite sides of the second installation block 443 in the width direction thereof.

[0072] In this embodiment, the two counterweight walls 326 are located on opposite sides of the second mounting block 443 in the width direction, and the length of the counterweight walls 326 can be the same as the length of the second mounting block 443. When a certain weight is required, compared to placing the two counterweight walls 326 on opposite sides of the second mounting block 443 in the length direction, the counterweight walls 326 of this embodiment are shorter. This prevents the counterweight walls 326 from being too tall and squeezing the space for other components, thereby ensuring sufficient space for the installation and operation of other components. This arrangement of this embodiment makes the hair trimmer 100 more compact.

[0073] Furthermore, the two counterweight walls 326 include a first wall 327 and a second wall 328. The first wall 327 is located on one side of the second mounting block 443 close to the first mounting frame 431, and the second wall 328 is located on the other side opposite to the second mounting block 443. The thickness of the first wall 327 is greater than the thickness of the second wall 328, so that the mass of the first wall 327 is greater than the mass of the second wall 328.

[0074] In this embodiment, increasing the mass of the first wall 327 by increasing its thickness, rather than by increasing its height, maintains the compactness of the overall structure, prevents the counterweight wall 326 from being too tall and squeezing out space for other components, and facilitates internal layout and design optimization. Furthermore, the location near the first mounting bracket 431, close to the center of the device, where the heavier first wall 327 is located, not only helps maintain the device's center of gravity balance, but also reduces eccentric forces and vibrations. Furthermore, placing the thicker first wall 327 near the center of the device, rather than near the edge, helps reduce the size of the hair trimmer 100. Since the main components of the hair trimmer 100 are better protected when located in the middle of the device, placing the first wall 327 at the edge would increase the device's lateral bulk, thereby increasing the size of the hair trimmer 100.

[0075] In one embodiment, the thickness of the first bottom plate 225 is smaller than the thickness of the second bottom plate 325 , so that the mass of the first bottom plate 225 is smaller than the mass of the second bottom plate 325 .

[0076] In this embodiment, rather than increasing the mass of the second base plate 325 by increasing its width, increasing the thickness of the second base plate 325 to make it greater than the mass of the first base plate 225 maintains the compactness of the overall structure, preventing the base plate from occupying excessive lateral space, thereby leaving more space for the layout and installation of other components. Furthermore, increasing the thickness and mass further centralizes and stabilizes the center of gravity, reducing the problem of center of gravity shift caused by increased width. Furthermore, a thicker base plate has greater bending resistance, providing better support and stability during operation, improving the overall strength of the base plate, enhancing its impact and fatigue resistance, and extending its service life.

[0077] In one embodiment, the first mounting frame 431 includes a first mounting block 433 and two mounting protrusions 434 protruding from the wall of the first mounting block 433 near the first base plate 225, and a avoidance space 225 adapted to the mounting protrusion 434 is formed on the wall of the first base plate 225 near the first mounting frame 431; two connecting protrusions 227 are protruding from the wall of the first base plate 225 away from the avoidance space 225, and the connecting protrusions 227 are arranged corresponding to the avoidance space 225; the first motion unit 200 also includes a fastener 228, which is passed through the connecting protrusion 227 and the mounting protrusion 434 to fix the first transmission seat 224 and the first mounting frame 431.

[0078] In this embodiment, the fastener 228 can be a bolt. Furthermore, the connecting protrusion 227 and the wall surface of the first base plate 225 away from the avoidance space 225 are enclosed to form a connecting groove 227, and the connecting groove 227 is used to accommodate the head of the bolt. The function of the mounting protrusion 434 and the connecting protrusion 227 is to strengthen the local structural strength, increase the connection thickness between the first mounting seat and the first mounting block 433, and ensure that the connection between the first transmission seat 224 and the first mounting block 433 is more stable. The multi-point fixation of the two mounting protrusions 434 and the first base plate 225 further improves the strength and stability of the connection, and avoids the looseness and instability that may be caused by a single-point connection. Secondly, the mounting protrusion 434 and the avoidance space 225 provide a clear positioning and installation area, improve the installation accuracy and assembly efficiency, and also prevent slippage between components, ensuring stability during operation.

[0079] Furthermore, the second mounting block 443 is provided with mounting lugs 444 at opposite ends in the length direction thereof, and the two counterweight walls 326 are provided on opposite sides of the second mounting block 443 avoiding the mounting lugs 444 .

[0080] In this embodiment, the mounting lugs 444 can be used to connect to the elastic support components of the second moving member 440, such as spring clips. It will be appreciated that the first mounting block 433 also has mounting lugs at opposite ends along its length to connect to the elastic support components of the first moving member 430. For example, the driving member and the moving member in the drive mechanism 400 are connected by spring clips. The connection of the mounting lugs 444 to the spring clips not only enables the second moving member 430 to reciprocate in a predetermined direction but also reduces vibration of the drive mechanism 400. Providing the counterweight wall 326 away from the mounting lug 444 prevents interference between the counterweight wall 326 and the mounting lug 444 and other components, optimizing internal space utilization and making the structure of the hair trimmer 100 more compact. Furthermore, providing the counterweight wall 326 away from the mounting lug 444 simplifies the manufacturing process, reduces complexity, and improves manufacturing precision and efficiency. Furthermore, during installation, the counterweight wall 326 and the mounting lug 444 do not interfere with each other, simplifying the assembly process and improving assembly efficiency and reliability.

[0081] In one embodiment, the first cutting head assembly 210 and the second cutting head assembly 310 are arranged side by side; the first transmission assembly 220 and the second transmission assembly 320 reciprocate along a preset direction, and the first transmission assembly 220 and the second transmission assembly 320 move in opposite directions.

[0082] In this embodiment, the first transmission assembly 220 and the second transmission assembly 320 reciprocate in opposite directions along predetermined directions. This design allows the vibrations generated by the movement of the two transmission assemblies to cancel each other out, reducing vibration during operation and thus noise, providing a quieter user environment. Secondly, the side-by-side arrangement of the first and second cutting head assemblies 210 and 310 allows for simultaneous processing of more hair, improving trimming efficiency. The side-by-side arrangement of the cutting heads allows for a larger trimming area, enhancing trimming efficiency.

[0083] For further information, please refer to Figure 3 and Figure 5 The driving mechanism 400 also includes a first driving member 410 and a second driving member 420. The first driving member 410 and the second driving member 420 are arranged side by side and spaced apart. The first moving member 430 and the second moving member 440 are respectively arranged side by side and spaced apart on the first driving member 410 and the second driving member 420, and the first driving member 410 corresponds to the first moving member 430, and the second driving member 420 corresponds to the second moving member 440.

[0084] In this embodiment, the first and second drive members 410 and 420 each comprise a coil. When energized, these members generate a varying electromagnetic field, causing the first and second moving members 430 and 440 to reciprocate under the influence of the electromagnetic fields of the first and second drive members 410 and 420, respectively. Compared to a single-drive system, a dual-drive system can provide higher overall power output because each drive member can independently provide driving capability. Each drive member drives a transmission assembly, enabling more efficient power distribution and preventing excessive burden on a single drive member, thereby improving the overall operating efficiency of the device. Furthermore, the dual-drive system allows the vibrations of the first and second moving members 430 and 440 to offset each other, reducing overall device vibration. This design provides a smoother operating experience and reduces user fatigue. Furthermore, the dual-drive system allows for independent control and adjustment of the two transmission assemblies. This allows the trimmer to be adjusted for different trimming modes or conditions, ensuring that the hair trimmer 100 provides optimal performance and results in a variety of scenarios. Furthermore, single-drive systems often require complex transmission mechanisms to simultaneously drive multiple transmission components, potentially increasing system complexity and increasing the risk of failure. Dual-drive systems simplify the overall design by connecting each drive component to its corresponding transmission component. Maintenance and replacement of each drive component is relatively independent, reducing repair complexity and overall system maintenance costs.

[0085] In one embodiment, at least two first blade heads 211 include a long-beard blade head (not shown) and a first short-beard blade head (not shown), and at least one second blade head 311 includes a second short-beard blade head (not shown), and the long-beard blade head is arranged between the first short-beard blade head and the second short-beard blade head.

[0086] In this embodiment, the long-beard head is used to trim longer hairs, reducing them to a medium or shorter length, preparing them for further trimming with the short-beard head. The short-beard head is used to trim shorter hairs. Positioning the long-beard head between the two short-beard heads allows for simultaneous treatment of both long and short hairs, improving trimming efficiency. For example, the long-beard head will first trim the longer hairs, followed by the short-beard heads on either side for a more detailed trim. Furthermore, this arrangement allows for a closer fit around the jawline for shaving, making it more convenient to use.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hair trimmer, characterized in that: It includes a first motion unit, a second motion unit and a driving mechanism; wherein, The first motion unit includes a first cutter head assembly and a first transmission assembly, wherein the first transmission assembly is in transmission connection with the drive mechanism and the first cutter head assembly; the second motion unit includes a second cutter head assembly and a second transmission assembly, wherein the second transmission assembly is in transmission connection with the drive mechanism and the second cutter head assembly; The first cutter head assembly includes at least two first cutter heads, the second cutter head assembly includes at least one second cutter head, and the number of the first cutter heads is greater than the number of the second cutter heads; The mass of the first transmission assembly is smaller than the mass of the second transmission assembly.

2. The hair trimmer according to claim 1, wherein The driving mechanism includes a first moving part and a second moving part, the first transmission assembly is connected to the first moving part, and the second transmission assembly is connected to the second moving part.

3. The hair trimmer according to claim 2, wherein: The mass of the first moving member is smaller than the mass of the second moving member.

4. The hair trimmer according to claim 2, wherein: The first moving member includes a first mounting frame and a first permanent magnet disposed on the first mounting frame, and the first transmission assembly is fixedly connected to the first mounting frame; The second moving part includes a second mounting frame and a second permanent magnet arranged on the second mounting frame, and the second transmission assembly is fixedly connected to the second mounting frame.

5. The hair trimmer according to claim 4, wherein: The mass of the first mounting bracket is smaller than the mass of the second mounting bracket.

6. The hair trimmer according to claim 5, characterized in that The first mounting bracket includes a first mounting block fixedly connected to the first transmission assembly, and the second mounting bracket includes a second mounting block fixedly connected to the second transmission assembly. The thickness of the second mounting block is greater than that of the first mounting block.

7. The hair trimmer according to claim 4, wherein: The first transmission assembly includes a first transmission base and at least two first transmission rods connected to the first transmission base, the first transmission base is connected to the first mounting frame, and each of the first transmission rods is connected to the first cutter head respectively; The second transmission assembly includes a second transmission seat and at least one second transmission rod connected to the second transmission seat, the second transmission seat is connected to the second mounting bracket, and each second transmission rod is respectively connected to the second cutter head.

8. The hair trimmer according to claim 7, wherein: The mass of the first transmission seat is smaller than the mass of the second transmission seat, or the total mass of the first transmission seat and the first moving part is smaller than the total mass of the second transmission seat and the second moving part.

9. The hair trimmer according to claim 8, wherein The first transmission seat includes a first base plate fixedly connected to the first mounting frame, the second transmission seat includes a second base plate and a counterweight wall protruding from the second base plate, the second base plate is fixedly connected to the second mounting frame, and the counterweight wall is located on the side wall of the second mounting frame.

10. The hair trimmer according to claim 9, wherein The second transmission seat includes two counterweight walls, and the two counterweight walls are located on opposite sides of the second mounting frame.

11. The hair trimmer according to claim 10, wherein: The two counterweight walls include a first wall and a second wall, the first wall is located on a side of the second mounting frame close to the first mounting frame, the second wall is located on the other side opposite to the second mounting frame, and the thickness of the first wall is greater than that of the second wall.

12. The hair trimmer according to claim 9, wherein The thickness of the first bottom plate is smaller than the thickness of the second bottom plate.

13. The hair trimmer according to claim 9, wherein The first mounting bracket includes a first mounting block and two mounting protrusions protruding from a wall surface of the first mounting block close to the first base plate. A clearance space adapted to the mounting protrusions is formed on a wall surface of the first base plate close to the first mounting bracket. Two connecting protrusions are protruding from a wall surface of the first base plate facing away from the first mounting bracket. The connecting protrusions are arranged corresponding to the clearance spaces. The first motion unit further includes a fastener, which is passed through the connecting protrusion and the mounting protrusion to fix the first transmission seat and the first mounting bracket.

14. The hair trimmer according to any one of claims 1 to 13, characterized in that The first cutter head assembly and the second cutter head assembly are arranged side by side; The first transmission assembly and the second transmission assembly reciprocate along a preset direction, and the movement directions of the first transmission assembly and the second transmission assembly are opposite.

15. The hair trimmer according to claim 14, wherein The at least two first blade heads include a long-beard blade head and a first short-beard blade head, and the at least one second blade head includes a second short-beard blade head. The long-beard blade head is arranged between the first short-beard blade head and the second short-beard blade head.

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