Hair trimmer

Abstract

A hair trimmer, comprising three technical solutions. In solution 1, a hair trimmer (100) comprises a first moving unit (200), a second moving unit (300) and a driving mechanism (400); the first moving unit comprises a first cutter head assembly (210) and a first transmission assembly (220); the second movement unit comprises a second cutter head assembly (310) and a second transmission assembly (320); the number of first cutter heads (211) of the first cutter head assembly is greater than the number of second cutter heads (311) of the second cutter head assembly; the mass of the first transmission assembly is less than the mass of the second transmission assembly. In solution 2, a hair trimmer (100) comprises a first cutting unit (200), a second cutting unit (300), and a power device (400); the number of first cutter heads (211) of the first cutting unit is greater than the number of second cutter heads (311) of the second cutting unit, and the weight of the first cutting unit is greater than the weight of the second cutting unit; the power device is provided with a first mover assembly (430) and a second mover assembly (440), and the weight of the second mover assembly is greater than the weight of the first mover assembly. In solution 3, a hair trimmer (100) comprises a first driving unit (110), a second driving unit (120), a first cutter head assembly (130) and a second cutter head assembly (140); the number of first cutter heads (131) of the first cutter head assembly is greater than the number of second cutter heads (141) of the second cutter head assembly, and the reciprocating speed of a first moving blade (132) of the first cutter head is less than the reciprocating speed of a second moving blade (142) of the second cutter head.

Description

Hair trimmer

[0001] This application claims priority to the Chinese patent application No. 2024113382205, filed on September 24, 2024, and entitled "Hair trimmer", the content of which is incorporated herein by reference in its entirety.

[0002] This application claims priority to the Chinese patent application No. 2024113382949, filed on September 24, 2024, and entitled "Hair trimmer", the content of which is incorporated herein by reference in its entirety.

[0003] This application claims priority to the Chinese patent application No. 2024113458416, filed on September 24, 2024, and entitled "Hair trimmer", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0004] The present application relates to the technical field of hair trimming, in particular to a hair trimmer. BACKGROUND

[0005] The multi-clipper hair trimmer has multiple clipper heads, which can effectively expand the trimming area and is suitable for various trimming scenes, such as trimming long hair and short hair at the same time. However, when multiple clipper heads are driven synchronously, the large vibration amplitude reduces the comfort when the user holds it, and there is a problem of loud noise. SUMMARY

[0006] In view of the above problems, the first scheme of the present application proposes a hair trimmer, which aims to solve the technical problem that when the number of clipper heads is odd or the mass of each clipper head is different, strong vibration will still occur.

[0007] To achieve the above-mentioned purpose, the hair trimmer proposed by the present application comprises a first movement unit, a second movement unit and a driving mechanism; wherein the first movement unit comprises a first clipper head assembly and a first transmission assembly, the first transmission assembly is transmissionally connected with the driving mechanism and the first clipper head assembly; the second movement unit comprises a second clipper head assembly and a second transmission assembly, the second transmission assembly is transmissionally connected with the driving mechanism and the second clipper head assembly; the first clipper head assembly comprises at least two first clipper heads, the second clipper head assembly comprises at least one second clipper head, the number of the first clipper heads is greater than the number of the second clipper heads; the mass of the first transmission assembly is less than the mass of the second transmission assembly.

[0008] In view of the above problems, the second scheme of the present application proposes a hair trimmer, which aims to solve the technical problem that when the weights of different cutting units are inconsistent, the hair trimmer will produce loud noise.

[0009] To achieve the above object, the hair trimmer provided by the present application comprises: a first cutting unit provided with a plurality of first cutting heads; a second cutting unit provided with at least one second cutting head, the number of the first cutting heads being greater than the number of the second cutting heads, and the weight of the first cutting unit being greater than the weight of the second cutting unit; and a power device provided with a first mover assembly and a second mover assembly, the first mover assembly being in transmission connection with the first cutting unit, the second mover assembly being in transmission connection with the second cutting unit, and the weight of the second mover assembly being greater than the weight of the first mover assembly.

[0010] In view of the above problems, the third aspect of the present application provides a hair trimmer, which aims to solve the technical problem that when the number of cutting heads in two cutting head groups is inconsistent, the contact area of the moving cutting head and the static cutting head in the cutting head group with more cutting heads is larger, resulting in larger noise.

[0011] To achieve the above object, the hair trimmer provided by the present application comprises: a first cutting unit provided with a plurality of first cutting heads; a second cutting unit provided with at least one second cutting head, the number of the first cutting heads being greater than the number of the second cutting heads, and the weight of the first cutting unit being greater than the weight of the second cutting unit; and a power device provided with a first mover assembly and a second mover assembly, the first mover assembly being in transmission connection with the first cutting unit, the second mover assembly being in transmission connection with the second cutting unit, and the weight of the second mover assembly being greater than the weight of the first mover assembly. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0013] FIG. 1 shows a structural schematic diagram of an embodiment of the hair trimmer of the present application;

[0014] FIG. 2 is an exploded view of the structure of the hair trimmer in FIG. 1;

[0015] FIG. 3 is another exploded view of the structure of the hair trimmer in FIG. 1;

[0016] FIG. 4 is a sectional view of the hair trimmer in FIG. 1;

[0017] Fig. 5 is an exploded view of the hair clipper of Fig. 4;

[0018] Fig. 6 is a structural schematic view of the first transmission assembly and the first moving member of Fig. 3;

[0019] Fig. 7 is a structural schematic view of the second transmission assembly and the second moving member of Fig. 3;

[0020] Fig. 8 shows a structural schematic view of an embodiment of the hair clipper of the present application;

[0021] Fig. 9 is an exploded view of the hair clipper of Fig. 8;

[0022] Fig. 10 is another exploded view of the hair clipper of Fig. 8;

[0023] Fig. 11 is a sectional view of the hair clipper of Fig. 8;

[0024] Fig. 12 is an exploded view of the hair clipper of Fig. 11;

[0025] Fig. 13 is a partial structural schematic view of Fig. 10;

[0026] Fig. 14 is another partial structural schematic view of Fig. 10;

[0027] Fig. 15 shows a structural schematic view of an embodiment of the hair clipper of the present application;

[0028] Fig. 16 is an exploded view of the hair clipper of Fig. 15;

[0029] Fig. 17 is another exploded view of the hair clipper of Fig. 15;

[0030] Fig. 18 is a sectional view of the hair clipper of Fig. 15;

[0031] Fig. 19 is another sectional view of the hair clipper of Fig. 15 from another angle;

[0032] Fig. 20 is a structural schematic view of the first transmission assembly of Fig. 17;

[0033] Fig. 21 is a structural schematic view of the second transmission assembly of Fig. 17.

[0034] Explanation of Reference Signs:

[0035] Explanation of Reference Signs Corresponding to Figs. 1 to 7 of the First Aspect:

[0036] Explanation of Reference Signs Corresponding to Figs. 8 to 14 of the Second Aspect:

[0037] Explanation of Reference Signs Corresponding to Figs. 15 to 21 of the Third Aspect: DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application. In addition, the technical solutions in each embodiment can be combined with each other, but the combination of the technical solutions should be based on the fact that a person of ordinary skill in the art can realize the combination, and when the combination of the technical solutions is contradictory or unachievable, it should be considered that the combination of the technical solutions does not exist, and is also not within the protection scope of the present application.

[0039] It should be noted that if the embodiments of the present application 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 condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0040] In addition, if the embodiments of the present application involve descriptions such as “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” appearing throughout the text means that three parallel schemes are included, for example, “A and / or B” includes A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0041] The present application provides three independent schemes, and the following points need to be explained in advance: first, regarding the component names, the component names of each scheme in the three schemes of the present application are independent of each other and are not mutually referenced. For example, the component names in the first scheme are only applicable to the first scheme and are not applicable to the second scheme and the third scheme. Even if the same names as in the first scheme exist in the second scheme and the third scheme, the components referred to are different, which has nothing to do with the first scheme, or the same components as in the first scheme exist in the third scheme and the second scheme, but the names are different, which also has nothing to do with the first scheme. As for the second scheme and the third scheme, the same understanding as the first scheme can be made, and will not be described in detail. Next, examples will be given to illustrate:

[0042] (1) The first cutter head assembly in the first aspect and the first cutting unit in the second aspect both represent the same component, but the names are different in different aspects. Please understand the respective names in each aspect.(2) The first transmission seat in the first aspect, the first transmission seat in the second aspect, and the first base in the third aspect all represent the same component, but the names are different in different aspects. Please understand the respective names in each aspect.(3) The second cutter head assembly in the first aspect and the second cutting unit in the second aspect represent the same component, but the names are different in different aspects. Please understand the respective names in each aspect. Some of the above-mentioned components represent the same component, but the component names are different in the three aspects. Please refer to the above method for the same understanding and processing. This embodiment will not be illustrated one by one.

[0043] Secondly, regarding the component name, the component name in each aspect of the three aspects of the present application is independent of each other and is not mutually referenced. For example, the component name in the first aspect is only applicable to the first aspect and is not applicable to the second aspect and the third aspect. Even if the same label exists in the second aspect and the third aspect as in the first aspect, the components referred to are different, which has no relation to the first aspect. Or, the same component exists in the second aspect and the third aspect as in the first aspect, but the labels are different, which also has no relation to the first aspect. As for the second aspect and the third aspect being the same as the first aspect, the same understanding can be made, and no further description is given. Next, examples will be given to illustrate:

[0044] (1) The first cutter head assembly exists in the first aspect and the third aspect, but the labels of the first cutter head assembly are different in different aspects. For example, the label of the first cutter head assembly in the first aspect is 210, and the label of the first cutter head assembly in the third aspect is 130. Therefore, the same component has different labels in different aspects. Please understand the respective labels in each aspect.(2) The first cutter head exists in the first aspect to the third aspect, but the labels of the moving cutter are different in different aspects. For example, the label of the first cutter head in the first aspect is 211, the label of the first cutter head in the second aspect is 211, and the label of the first cutter head in the third aspect is 131. Therefore, the same component has different labels in different aspects. Please understand the respective labels in each aspect. Some of the above-mentioned components represent the same component, but the labels are different in the three aspects. Please refer to the above method for the same understanding and processing. This embodiment will not be illustrated one by one.

[0045] (3) The same reference numerals 200 are used in the first and second solutions, but represent different components in different solutions. For example, in the first solution, the reference numeral 200 represents the first moving unit, and in the second solution, the reference numeral 200 represents the first cutting unit. Therefore, the same reference numeral represents different components in different solutions, and the respective reference numerals should be used for understanding in each solution. (4) The same reference numerals 300 are used in the first and second solutions, but represent different components in different solutions. For example, in the first solution, the reference numeral 300 represents the second moving unit, and in the second solution, the reference numeral 300 represents the second cutting unit. Therefore, the same reference numeral represents different components in different solutions, and the respective reference numerals should be used for understanding in each solution. The same understanding and processing can be performed for the same reference numerals representing different components in the three solutions, and the present embodiment will not be exemplified one by one.

[0046] Thirdly, regarding the drawings, the three solutions include 21 drawings in total, but each solution has its respective corresponding drawings, and the remaining drawings are irrelevant to the solution, and should not be cross-referenced. For example, the first solution only corresponds to reference drawings 1-7, and the other drawings are irrelevant to the first solution. The second solution only corresponds to reference drawings 8-14, and the other drawings are irrelevant to the second solution. The third solution only corresponds to reference drawings 15-21, and the other drawings are irrelevant to the third solution.

[0047] A multi-clip hair trimmer has multiple clip heads, which can effectively expand the trimming area and be suitable for various trimming scenarios, such as trimming long and short hairs at the same time. However, when multiple clip heads are synchronously driven, a large vibration amplitude will reduce the comfort when a user holds the trimmer.

[0048] The prior art usually adopts two transmission assemblies to connect two clip head assemblies with the same mass and move them in opposite directions to reduce vibration. However, when the number of clip heads is odd or the masses of the clip heads are different, the mass difference between the clip head assemblies connected by the two transmission assemblies is large, and strong vibration will still be generated.

[0049] The above content is only used to assist understanding of the technical solutions of the application, and does not represent an acknowledgement of the above content as prior art.

[0050] To solve the above problems, the first solution of the present application proposes a hair trimmer 100.

[0051] Please refer to FIGS. 1-7, the first solution of the present application proposes a hair trimmer 100, which can be an electric shaver, a hair clipper, etc.

[0052] In the embodiments of the present application, please refer to FIG. 1 to FIG. 7, the hair trimmer 100 comprises a first motion unit 200, a second motion unit 300 and a driving mechanism 400; wherein the first motion unit 200 comprises a first cutter head assembly 210 and a first transmission assembly 220, the first transmission assembly 220 is transmissionally connected to the driving mechanism 400 and the first cutter head assembly 210; the second motion unit 300 comprises a second cutter head assembly 310 and a second transmission assembly 320, the second transmission assembly 320 is transmissionally connected to the driving mechanism 400 and the second cutter head assembly 310; the first cutter head assembly 210 comprises at least two first cutter heads 211, the second cutter head assembly 310 comprises at least one second cutter head 311, the number of the first cutter heads 211 is greater than the number of the second cutter heads 311; the mass of the first transmission assembly 220 is less than the mass of the second transmission assembly 320.

[0053] In the embodiments, the driving mechanism 400 comprises but is not limited to a linear motor and its mover, the driving mechanism 400 is used to provide 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 comprise the first cutter head assembly 210 and the second cutter head assembly 310 for fitting the skin and trimming the hair, the first cutter head assembly 210 comprises two first cutter heads 211, which can be suitable for trimming long hair and short hair, the second cutter head assembly 310 comprises one second cutter head 311, which can be suitable for trimming short hair or long hair. In other embodiments, the first cutter head assembly 210 can also comprise three, four or more first cutter heads 211, and the second cutter head assembly 310 can also comprise two, three or more second cutter heads 311 to meet different trimming needs.

[0054] The first transmission assembly 220 and the second transmission assembly 320 are used to connect the mover of the driving mechanism 400 respectively to drive the first cutter head assembly 210 and the second cutter head assembly 310 to move, to play the role of transmission bridge. The first transmission assembly 220 can comprise a transmission shaft, and the second transmission assembly 320 can comprise a transmission shaft and a counterweight, so that the mass of the first transmission assembly 220 and the second transmission assembly 320 matches the first cutter head assembly 210 and the second cutter head assembly 310, the setting of the counterweight can effectively reduce the difficulty of counterweight balance, for example, if the mass of the first cutter head assembly 210 exceeds that of the second cutter head assembly 310, a counterweight of corresponding mass can be added to the second transmission assembly 320 to realize the counterweight balance of the first motion unit 200 and the second motion unit 300.

[0055] The hair trimmer 100 of the present application comprises at least two first cutting heads 211 in the first cutting head assembly 210 and at least one second cutting head 311 in the second cutting head assembly 310, so that the hair trimmer 100 can adapt to different trimming needs and trim long and short hairs at the same time. At the same time, the arrangement of multiple cutting heads can expand the trimming area, thereby improving the trimming efficiency. Secondly, the number of first cutting heads 211 is greater than the number of second cutting heads 311, resulting in the mass of the first cutting head assembly 210 being greater than the mass of the second cutting head assembly 310. The mass of the first transmission assembly 220 is less than the mass of the second transmission assembly 320, so as to reduce the mass difference between the first motion unit 200 and the second motion unit 300, balance the pushing force in the system, avoid mechanical imbalance and vibration caused by one-sided overweight, effectively reduce vibration, improve the comfort of users when using the hair trimmer 100, and reduce noise.

[0056] In addition, the counterweight balance of the first motion unit 200 and the second motion unit 300 is achieved by optimizing the mass of the first transmission assembly 220 and the second transmission assembly 320. Only one-time design and adjustment is needed to achieve the counterweight balance of the two, reducing the independent adjustment and maintenance work of each cutting head and reducing the complexity of system design and maintenance. For example, the first cutting head 211 and the second cutting head 311 can be mass-produced to ensure the consistency of the first cutting head 211 and the second cutting head 311 and improve production efficiency; at least two first cutting heads 211 are arranged in the first cutting head assembly 210 and at least one second cutting head 311 is arranged in the second cutting head assembly 310, only the total mass of the first cutting head assembly 210 and the total mass of the second cutting head assembly 310 need to be calculated, and the mass of the first transmission assembly 220 and the second transmission assembly 320 needs to be calculated and designed, so as to achieve the counterweight balance of the first motion unit 200 and the second motion unit 300. Moreover, cutting heads usually need to consider multiple functions, such as cutting, adjusting, etc. Achieving counterweight balance on the first cutting head assembly 210 and the second cutting head assembly 310 will increase the design difficulty and complexity, and the design of the transmission assembly is relatively simple, and achieving counterweight balance on it can reduce the design difficulty.

[0057] In an embodiment, referring to FIGS. 3-7, 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. In this embodiment, the driving mechanism 400 further includes a driving assembly for driving the first moving member 430 and the second moving member 440. The driving assembly can be one driving member for simultaneously driving the first moving member 430 and the second moving member 440 to move, or two driving members for respectively driving the first moving member 430 and the second moving member 440, which are respectively arranged corresponding to the first moving member 430 and the second moving member 440. The first moving member 430 and the second moving member 440, as the moving members of the driving mechanism 400, include but are not limited to permanent magnets. The driving assembly includes a coil for generating a changing electromagnetic field when energized to move the first moving member 430 and the second moving member 440. The first moving member 430 is used to connect the first transmission assembly 220 to move the first cutter head assembly 210, and the second moving member 440 is used to connect the second transmission assembly 320 to move the second cutter head assembly 310.

[0058] Further, the mass of the first moving member 430 is less than the mass of the second moving member 440. In this embodiment, the first moving member 430 and the second moving member 440 are counterbalanced on the basis that the mass of the first transmission assembly 220 is less than the mass of the second transmission assembly 320, that is, the moving members of the driving mechanism 400 are counterbalanced, and the mass is increased in the form of counterweight. If the limit value of the mass of the first transmission assembly 220 and the second transmission assembly 320 still cannot reach the ideal balance state, the mass of the first moving member 430 and the second moving member 440 can be further adjusted to avoid the limitation of a single method causing too large mass difference between different loads of the driving member. Secondly, the moving member structure of the driving mechanism 400 is relatively simple, and the mass distribution is easy to adjust, so that the counterbalance can be realized on the moving member to reduce the design difficulty.

[0059] Specifically, the first moving member 430 includes a first mounting frame 431 and a first permanent magnet 432 arranged 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 arranged 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 are respectively fixedly mounted on the first mounting frame 431 and the second mounting frame 441 by bonding, clamping or other means, to reciprocate under the action of the changing electromagnetic field generated by the driving assembly, and further drive the first cutter head assembly 210 and the second cutter head assembly 310 to perform trimming action.

[0060] The mass of the first mounting frame 431 is less than the mass of the second mounting frame 441. The materials of the first mounting frame 431 and the second mounting frame 441 can be the same or different. To reduce the difficulty of counterweighting the first mounting frame 431 and the second mounting frame 441, the first mounting frame 431 and the second mounting frame 441 are usually made of the same material, and the mass of the first mounting frame 431 is made less than the mass of the second mounting frame 441 by changing the size of the first mounting frame 431 and the second mounting frame 441. When the size of the first mounting frame 431 and the second mounting frame 441 is the same and the materials are different, the first mounting frame 431 can be made of light materials such as aluminum alloy, and the second mounting frame 441 can be made of heavy materials such as steel or copper, so that the mass of the first mounting frame 431 is less than the mass of the second mounting frame 441.

[0061] Since the mass of the permanent magnet is usually closely related to its magnetic properties, adjusting the mass on the mounting frame can 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 counterweight adjustment, ensuring the driving efficiency and stability of the system. Secondly, the structure of the mounting frame is usually relatively simple and can be designed with various materials and structures. Therefore, it is more flexible to adjust the mass on the mounting frame. For example, the mass can be easily adjusted by selecting different materials or adding counterweight blocks, without involving the complex manufacturing process of the permanent magnet. This flexibility makes it more convenient and efficient to adjust the counterweight, reducing the complexity of design and manufacturing.

[0062] Further, the first mounting frame 431 includes a first mounting block 433 fixedly connected to the first transmission assembly 220, and the second mounting frame 441 includes a second mounting block 443 fixedly connected to the second transmission assembly 320. The thickness of the second mounting block 443 is greater than the thickness of the first mounting block 433.

[0063] In this embodiment, the shapes of the first mounting block 433 and the second mounting block 443 can be the same or different. To more accurately and efficiently control the mass of the first mounting block 433 and the second mounting block 443, the first mounting block 433 and the second mounting block 443 are usually made of the same shape.

[0064] In this embodiment, the thickness of the first mounting block 433 and the second mounting block 443 is changed so that the mass of the first mounting frame 431 is less than the mass of the second mounting frame 441. This can more accurately control the mass difference. By adjusting the thickness, a small mass increase or decrease can be achieved. However, changing the material may result in a larger mass change, which is difficult to control accurately. In addition, adjusting the thickness does not require additional materials or complex processes, which can effectively control the manufacturing cost. 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 the manufacturing complexity. At the same time, by adjusting the mass through the thickness, the mass difference can be achieved while maintaining the strength and rigidity of the material. However, changing the material may affect the structural strength and rigidity of the component.

[0065] In an embodiment, the first transmission assembly 220 includes a first transmission seat 224 connected to the first mounting frame 431 and at least two first transmission rods 226 connected to the first transmission seat 224, each first transmission rod 226 being connected to a first tool bit 211. The second transmission assembly 320 includes a second transmission seat 324 connected to the second mounting frame 441 and at least one second transmission rod 329 connected to the second transmission seat 324, each second transmission rod 329 being connected to a second tool bit 311. The mass of the first transmission assembly 220 is less than the mass of the second transmission assembly 320.

[0066] In this embodiment, the number of first transmission rods 226 is two, and the number of second transmission rods 329 is one. The first transmission assembly 220 further includes a first connecting seat, one of the first transmission rods 226 is integrally provided with the first transmission seat 224, and the other first transmission rods 226 are provided on the first connecting seat. The first connecting seat is further sleeved on the first transmission rod 226 integrally provided with the first transmission seat 224, so that the at least two first transmission rods 226 are arranged side by side and spaced apart. This arrangement can make the first transmission rod 226 have stronger support for the first tool bit 211 and more stable support, so that the plurality of first tool bits 211 can run smoothly. The first connecting seat and the other first transmission rods 226 can be made of plastic to reduce the mass. To reduce the mass difference between the total mass of the first transmission rod 226 and the first connecting seat and the mass of the second transmission rod 329, the second transmission assembly 320 includes a second connecting seat, one of the second transmission rods 329 is integrally provided with the second transmission seat 324, and the second connecting seat is sleeved on the second transmission rod 329 integrally provided with the second transmission seat 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 seat. The second connecting seat and the other second transmission rods 329 can also be made of plastic to reduce the mass. In other embodiments, a plurality of transmission rods for connecting tool bits can be integrally made, or other transmission rod arrangement methods can be used, which will not be described here.

[0067] In the embodiment, the first transmission rod 226 and the second transmission rod 329 can be set to have the same mass, and the first transmission seat 224 can be set to have a mass smaller than that of the second transmission seat 324. Alternatively, the first transmission seat 224 and the second transmission seat 324 can be set to have the same mass, and the first transmission rod 226 can be set to have a mass smaller than that of the second transmission rod 329. Alternatively, the first transmission seat 224 and the second transmission seat 324 can be set to have different masses, and the first transmission rod 226 and the second transmission rod 329 can also be set to have different masses, as long as the total mass of the first transmission seat 224 and the first transmission rod 226 is smaller than that of the second transmission seat 324 and the second transmission rod 329. For example, since the number of the first transmission rod 226 is greater than that of the second transmission rod 329, if the same material is used, the mass of at least two first transmission rods 226 can be greater than that of at least one second transmission rod 329. In this case, the mass of the first transmission assembly 220 can be made greater than that of the second transmission assembly 320 by reducing the mass of the first transmission seat 224. This way, the counterweight design is more flexible.

[0068] Specifically, the mass of the first transmission seat 224 can be set to be smaller than that of the second transmission seat 324, or the total mass of the first transmission seat 224 and the first moving part 430 can be set to be smaller than that of the second transmission seat 324 and the second moving part 440.

[0069] In the embodiment, the mass of the first transmission seat 224 is set to be smaller than that of the second transmission seat 324 to achieve a smaller mass of the first transmission assembly 220 than that of the second transmission assembly 320, which makes the counterweight simpler and more accurate. Since the number of the two sets of transmission rods is inconsistent, if the counterweight balance is achieved on the transmission rods,

[0070] The structure and material need to be considered, which makes the design more complex and is not conducive to improving the production efficiency.

[0071] Secondly, there are various ways to achieve the total mass of the first transmission seat 224 and the first moving part 430 being smaller than that of the second transmission seat 324 and the second moving part 440. For example, when the mass of the first transmission seat 224 is the same as that of the second transmission seat 324, the mass of the first moving part 430 can be set to be smaller than that of the second moving part 440. When the mass of the first transmission seat 224 is smaller than that of the second transmission seat 324, the mass of the first moving part 430 can be the same as or different from that of the second moving part 440. When the mass of the first transmission seat 224 is greater than that of the second transmission seat 324, the mass of the first moving part 430 can be set to be smaller than that of the second moving part 440. This way, the counterweight design is more flexible, and the counterweight balance can be achieved by multiple components, avoiding the damage of the load-bearing components caused by the excessive weight of a single component.

[0072] Specifically, the first transmission seat 224 includes a first bottom plate 225 connected to the first mounting frame 431, and the second transmission seat 324 includes a second bottom plate 325 and a counterweight wall 326 protruding from the second bottom plate 325, the second bottom plate 325 is fixedly connected to the second mounting frame 441, and the counterweight wall 326 is located at the side wall of the second mounting frame 441. The mass of the first transmission seat 224 is less than the mass of the second transmission seat 324.

[0073] In the embodiment, the shapes of the first bottom plate 225 and the second bottom plate 325 can be square, circular or other shapes, and the masses of the first bottom plate 225 and the second bottom plate 325 can be the same or different, which is not limited herein. Compared with the first transmission seat 224, the second transmission seat 324 further includes the counterweight wall 326, so that the mass of the first transmission seat 224 is less than the mass of the second transmission seat 324, thereby the mass of the first transmission assembly 220 is less than the mass of the second transmission assembly 320, so as to reduce the vibration of the first motion unit 200 and the second motion unit 300. The counterweight wall 326 can be provided with one or more. When the counterweight wall 326 is one, the counterweight wall 326 can be located at the side wall of the second mounting frame 441 close to the first mounting frame 431, so that the weight of the counterweight wall 326 can be applied to the middle part of the hair trimmer 100, thereby reducing the vibration and avoiding the gravity of the counterweight wall 326 applied to the side wall, which can cause the second transmission assembly 320 to be unbalanced and increase the vibration, thereby generating noise.

[0074] When the counterweight wall 326 is provided with multiple, the counterweight walls 326 can be located at the side walls of the second mounting frame 441, so that the counterweight walls 326 can be provided with larger volume and larger mass, thereby reducing the mass difference between the first motion unit 200 and the second motion unit 300, so as to reduce the vibration. By reducing the vibration, the comfort of the user when using the device is greatly improved, and the holding is more stable, and fatigue is less likely to occur.

[0075] Further, the second transmission seat 324 includes two counterweight walls 326 located at opposite sides of the second mounting frame 441.

[0076] In the embodiment, compared with the first transmission seat 224, the second transmission seat 324 further includes two counterweight walls 326, so that the adjustable mass range is larger. The two counterweight walls 326 can be located at any opposite sides of the second mounting frame 441, which is not limited herein. The masses of the two counterweight walls 326 can be the same or different. When the masses of the two counterweight walls 326 are the same, the two counterweight walls 326 are arranged at opposite sides of the second mounting frame 441. The symmetrical design helps to uniformly 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 stress of the second transmission assembly 320, thereby avoiding the problem of unstable structure caused by excessive stress on one side.

[0077] When the masses of the two weight walls 326 are different, the weight 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 weight wall 326 is applied to the middle part of the hair clipper 100, thereby making the overall gravity center more concentrated, and the position close to the center can better balance the stress, avoiding the tilting problem caused by the main weight of the weight wall 326 applied to the side of the hair clipper 100.

[0078] Further, the second mounting block 443 is in a strip shape, and the two weight walls 326 are located on opposite sides of the second mounting block 443 in the width direction.

[0079] In the present embodiment, the two weight walls 326 are located on opposite sides of the second mounting block 443 in the width direction, and the length dimension of the weight wall 326 can be the same as the length dimension of the second mounting block 443. When a certain weight needs to be reached, compared with arranging the two weight walls 326 on opposite sides of the second mounting block 443 in the length direction, the height of the weight wall 326 in the present embodiment is smaller, avoiding that the height of the weight wall 326 is too large to squeeze the space of other components, thereby ensuring that other components have enough installation and operation space, and the arrangement of the present embodiment makes the structure of the hair clipper 100 more compact.

[0080] Further, the two weight 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 opposite side of the second mounting block 443, and 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.

[0081] In the present embodiment, compared with increasing the mass of the first wall 327 by increasing the height, the mass of the first wall 327 is increased by increasing the thickness, which can maintain the compactness of the overall structure, avoid that the height of the weight wall 326 is too large to squeeze the space of other components, and facilitate internal layout and design optimization. Secondly, the position close to the first mounting frame 431 is close to the center of the device, and the arrangement of the first wall 327 with a larger mass at this position not only helps to keep the gravity center of the device balanced and reduce the generation of eccentric force, but also reduces the vibration. In addition, the first wall 327 with a larger thickness is arranged at a position close to the center of the device, rather than a position close to the edge of the device, which helps to reduce the volume of the hair clipper 100. Since the main components of the hair clipper 100 are arranged at the middle part of the device, they can be better protected. If the first wall 327 is arranged at the edge of the device, the transverse volume of the device will increase, thereby increasing the volume of the hair clipper 100.

[0082] In an embodiment, the first bottom plate 225 has a thickness smaller than that of the second bottom plate 325, so that the mass of the first bottom plate 225 is smaller than that of the second bottom plate 325.

[0083] In the present embodiment, compared with increasing the mass of the second bottom plate 325 by increasing its width, the mass of the second bottom plate 325 is increased by increasing its thickness, so that the compactness of the overall structure can be maintained, and the bottom plate does not occupy too much lateral space, thereby leaving more space for the arrangement and installation of other components. Secondly, increasing the mass by increasing the thickness makes the center of gravity more concentrated and stable, reducing the problem of center of gravity deviation caused by increasing the width. In addition, the thicker bottom plate has higher bending resistance, can provide better support and stability during work, improve the overall strength of the bottom plate, enhance its impact resistance and fatigue resistance, and prolong the service life.

[0084] In an embodiment, the first mounting bracket 431 includes a first mounting block 433 and two mounting protrusions 434 protruding from the first mounting block 433 near the wall surface of the first bottom plate 225, and the wall surface of the first bottom plate 225 near the first mounting bracket 431 is formed with an avoidance space 225a adapted to the mounting protrusions 434; the wall surface of the first bottom plate 225 away from the avoidance space 225a is provided with two connecting protrusions 227 corresponding to the avoidance space 225a; the first motion unit 200 further includes a fastener 228 penetrating the connecting protrusions 227 and the mounting protrusions 434 to fix the first transmission seat 224 and the first mounting bracket 431.

[0085] In the present embodiment, the fastener 228 can be a bolt, and further, the connecting protrusions 227 and the wall surface of the first bottom plate 225 away from the avoidance space 225a enclose a connecting groove 227a for accommodating the head of the bolt. The mounting protrusions 434 and the connecting protrusions 227 serve to strengthen the local structural strength, increase the connecting thickness of 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. By multi-point fixing of the two mounting protrusions 434 and the first bottom plate 225, the strength and stability of the connection are further improved, and loosening and instability caused by single-point connection are avoided. Secondly, the mounting protrusions 434 and the avoidance space 225a provide a clear positioning and mounting area, improve the installation precision and assembly efficiency, and also prevent the sliding between components, ensuring the stability during operation.

[0086] Further, 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 arranged on opposite sides of the second mounting block 443 away from the mounting lugs 444.

[0087] In the embodiment, the mounting lug 444 can be used to connect the elastic supporting component of the second moving member 440, such as an elastic sheet. It can be understood that the first mounting block 433 is also provided with mounting lugs at opposite ends in the length direction, to connect the elastic supporting component of the first moving member 430. For example, the driving member and the moving member in the driving mechanism 400 are connected by an elastic sheet, and the mounting lug 444 connected to the elastic sheet can not only enable the second moving member 430 to reciprocate in the preset direction, but also reduce the vibration of the driving mechanism 400. The counterweight wall 326 is arranged away from the mounting lug 444, which can avoid interference between the counterweight wall 326 and the mounting lug 444 and other components, optimize the use of internal space, and make the structure of the hair trimmer 100 more compact. Secondly, the counterweight wall 326 is arranged away from the mounting lug 444, which can simplify the processing technology, reduce the complexity, and improve the manufacturing precision and efficiency. Moreover, the counterweight wall 326 and the mounting lug 444 do not interfere with each other during the installation process, which simplifies the assembly process, improves the assembly efficiency and reliability.

[0088] In an embodiment, the first cutter head assembly 210 and the second cutter head assembly 310 are arranged side by side; the first transmission assembly 220 and the second transmission assembly 320 reciprocate in the preset direction, and the movement directions of the first transmission assembly 220 and the second transmission assembly 320 are opposite.

[0089] In the embodiment, the first transmission assembly 220 and the second transmission assembly 320 reciprocate in the preset direction and in opposite directions, which makes the vibrations generated by the movement of the two transmission assemblies offset each other, reduces the vibration generated by the device during operation, and thus reduces the noise, providing a quieter use environment for the user. Secondly, the first cutter head assembly 210 and the second cutter head assembly 310 are arranged side by side, which can process more hair at the same time and improve the trimming efficiency. The side-by-side arrangement of the cutter heads can cover a larger trimming area and improve the trimming efficiency.

[0090] Further, referring to FIGS. 3 and 5, the driving mechanism 400 further 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 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.

[0091] In this embodiment, the first driving member 410 and the second driving member 420 each include a coil, and the first driving member 410 and the second driving member 420 generate a changing electromagnetic field after being energized. The first moving member 430 and the second moving member 440 each perform reciprocating motion under the action of the electromagnetic field of the first driving member 410 and the second driving member 420. Compared with a single driving system, the double driving system can provide higher overall power output, because each driving member can independently provide driving capacity. Each driving member is responsible for driving one transmission assembly, which can more efficiently distribute power and avoid overloading a single driving member, thereby improving the overall operating efficiency of the device. Secondly, the double driving system can make the vibrations of the first moving member 430 and the second moving member 440 cancel each other out, reducing the overall vibration of the device. This design helps to provide a smoother operation experience and reduce user holding fatigue. In addition, the double driving system allows independent control and adjustment of the two transmission assemblies. This enables the trimmer to be adjusted in different trimming modes or conditions, so that the hair trimmer 100 can provide optimal performance and results in various scenarios. In addition, in a single driving system, a complex transmission mechanism is usually required to drive multiple transmission assemblies at the same time, which can increase the complexity and failure rate of the system. The double driving system can simplify the overall design by connecting each driving member to its corresponding transmission assembly independently. The maintenance and replacement of each driving member are relatively independent, reducing the difficulty of maintenance and reducing the overall maintenance cost of the system.

[0092] In an embodiment, the at least two first cutting heads 211 include a long hair cutting head (not labeled in the figure) and a first short hair cutting head (not labeled in the figure), and the at least one second cutting head 311 includes a second short hair cutting head (not labeled in the figure). The long hair cutting head is arranged between the first short hair cutting head and the second short hair cutting head.

[0093] In this embodiment, the long hair cutting head is used to trim longer hair to a medium or shorter length, preparing the hair for further trimming by the short hair cutting heads. The short hair cutting heads are used to trim shorter hair. The long hair cutting head is arranged between the two short hair cutting heads, which helps to handle long and short hair at the same time and improve trimming efficiency. For example, the long hair cutting head first cuts longer hair, and then the two short hair cutting heads on the sides perform more delicate trimming. Moreover, this arrangement can closely fit the angle of the lower jaw for mustache removal, making it more convenient to use.

[0094] In an embodiment, the first cutter head 211 comprises a first moving cutter (not shown) and a first static cutter (not shown) covering the first moving cutter, and the second cutter head 311 comprises a second moving cutter (not shown) and a second static cutter (not shown) covering the second moving cutter; the first moving cutter is drivingly connected to the first transmission assembly 220 to enable the first moving cutter to reciprocate relative to the first static cutter in a preset direction; the second moving cutter is drivingly connected to the second transmission assembly 320 to enable the second moving cutter to reciprocate relative to the second static cutter in the preset direction; the stroke of the first moving cutter is less than the stroke of the second moving cutter, and the deviation of the frequency of the movement of the first moving cutter from the frequency of the movement of the second moving cutter is less than or equal to 5%.

[0095] In the embodiment, the moving cutter reciprocates relative to the static cutter in a preset direction to shear hair. The stroke refers to the maximum distance of the movement of the moving cutter in a single direction. The number of the first cutter heads 211 in the first cutter head assembly 210 is greater than the number of the second cutter heads 311 in the second cutter head assembly 310, resulting in greater vibration of the first moving cutter in the first cutter head assembly 210 and thus greater noise. Since the frequency of the movement of the first moving cutter is almost the same as the frequency of the movement of the second moving cutter, and the stroke of the first moving cutter is less than the stroke of the second moving cutter, the speed of the movement of the first moving cutter is less than the speed of the movement of the second moving cutter, and thus the total distance of the movement of the first moving cutter in a unit of time is shorter than the total distance of the movement of the second moving cutter in a unit of time. That is, the total contact area of the plurality of first moving cutters and the first static cutter in the first cutter head assembly is reduced, and the smaller contact area means that the friction area between the moving cutter and the static cutter is reduced, and thus the friction force is reduced, thereby reducing the mechanical vibration and noise caused by the friction.

[0096] The multi-cutter head hair trimmer has a plurality of cutter heads, which can effectively expand the trimming area and be suitable for a variety of different trimming scenarios, such as simultaneously trimming long hair and short hair.

[0097] In the prior art, a plurality of cutter head groups are driven by a plurality of motors of the same specification, and the motors control the speeds of the plurality of cutter head groups to be the same. When the number of cutter heads is odd, the number of cutter heads driven by different motors is different, some motors drive cutter head groups with a larger number of cutter heads, and some motors drive cutter head groups with a smaller number of cutter heads. However, since the number of cutter heads of different cutter head groups is inconsistent, when the motors control the speeds of different cutter head groups to be the same, the total contact area of the moving cutter and the static cutter in a unit of time in the cutter head group with a larger number of cutter heads is larger, resulting in greater noise.

[0098] The above content is only used to assist in understanding the technical solutions of the application and does not mean that the above content is prior art.

[0099] To solve the above problems, the second scheme of the present application provides a hair trimmer 100.

[0100] Please refer to FIGS. 8 to 14, the second scheme of the present application provides a hair trimmer 100, which can be an electric shaver, a hair clipper, etc.

[0101] In the embodiments of the present application, referring to FIGS. 8-14, the hair trimmer 100 includes a first cutting unit 200, a second cutting unit 300, and a power device 400; the first cutting unit 200 is provided with a plurality of first cutting heads 211; the second cutting unit 300 is provided with at least one second cutting head 311, the number of the first cutting heads 211 is greater than the number of the second cutting heads 311, and the weight of the first cutting unit 200 is greater than the weight of the second cutting unit 300; the power device 400 is provided with a first mover assembly 430 and a second mover assembly 440, the first mover assembly 430 is drivingly connected to the first cutting unit 200, the second mover assembly 440 is drivingly connected to the second cutting unit 300, and the weight of the second mover assembly 440 is greater than the weight of the first mover assembly 430.

[0102] In the embodiments, the power device 400 can further include a driving assembly for driving the first mover assembly 430 and the first mover assembly 430 to move, in other words, the driving assembly corresponds to the stator of the power device 400. The driving assembly can be one driving member for simultaneously driving the first mover assembly 430 and the first mover assembly 430 to move, or can be two driving members for respectively driving the first mover assembly 430 and the first mover assembly 430, and the two driving members are respectively arranged corresponding to the first mover assembly 430 and the first mover assembly 430. The first mover assembly 430 and the second mover assembly 440 as the mover of the power device 400 include but are not limited to permanent magnets and fixed seats. The driving assembly includes a coil for generating a changing electromagnetic field when energized to move the first mover assembly 430 and the second mover assembly 440. Among them, the first mover assembly 430 is used to drive the first cutting unit 200 to move, and the second mover assembly 440 is used to drive the second cutting unit 300 to move.

[0103] The first cutting unit 200 and the second cutting unit 300 respectively include two first cutting heads 211 and one second cutting head 311 for fitting the skin and trimming the hair, the two first cutting heads 211 can be suitable for trimming longer hair and shorter hair, and the one second cutting head 311 can be suitable for trimming shorter hair or longer hair. In other embodiments, the first cutting unit 200 can also include three, four or more first cutting heads 211, and the second cutting unit 300 can also include two, three or more second cutting heads 311 to meet different trimming needs.

[0104] The hair trimmer 100 of the present application comprises at least two first cutting heads 211 in the first cutting unit 200 and at least one second cutting head 311 in the second cutting unit 300, so that the hair trimmer 100 can adapt to different trimming needs and can trim both long and short hair at the same time. At the same time, the setting of multiple cutting heads can expand the trimming area, thereby improving the trimming efficiency. Secondly, the number of first cutting heads 211 is greater than the number of second cutting heads 311, and the weight of the first cutting unit 200 is greater than the weight of the second cutting unit 300. The weight of the first mover assembly 430 is set to be less than the weight of the second mover assembly 440 to balance the total weight of the first mover assembly 430 and the first cutting unit 200 and the total weight of the second mover assembly 440 and the second cutting unit 300, reduce the weight difference between the two, thereby balancing the pushing force in the drive assembly, avoiding mechanical imbalance and vibration caused by one-sided overweight, effectively reducing vibration and noise, and improving the comfort of the user when using the hair trimmer.

[0105] In addition, due to the simple structure of the first mover assembly 430 and the second mover assembly 440, the weight distribution is easy to adjust, and the counterweight balance can be achieved by optimizing the weight of the first mover assembly 430 and the second mover assembly 440, which can reduce the design difficulty. Only one-time design and adjustment can achieve the counterweight balance of the two, reducing the independent adjustment and maintenance work of each cutting head and reducing the complexity of system design and maintenance. For example, the first cutting head 211 and the second cutting head 311 can be mass-produced to ensure the consistency of the first cutting head 211 and the second cutting head 311 and improve production efficiency; and at least two first cutting heads 211 are arranged in the first cutting unit 200 and at least one second cutting head 311 is arranged in the second cutting unit 300. In this way, only the total weight of the first cutting unit 200 and the total weight of the second cutting unit 300 need to be calculated, and the weight of the first mover assembly 430 and the second mover assembly 440 needs to be calculated and designed, so that the counterweight balance can be achieved.

[0106] In addition, the first cutting unit 200 and the second cutting unit 300 usually contain complex structures, in addition to the weight of the cutting head, there may be other components such as shafts or supporting structures that affect the weight of the cutting unit. It is relatively simple and accurate to set counterweights in the mover assembly of the power device 400, which can reduce the design difficulty and reduce the weight interference of other components. For example, if the number of first cutting heads 211 is large, the number of corresponding shafts will also be large. If counterweights are implemented in other components in the cutting unit, the actual weight difference cannot be confirmed, resulting in inaccurate counterweights.

[0107] Specifically, the first mover assembly 430 is provided with a first fixed seat 431 drivingly connected to the plurality of first cutter heads 211 and a first permanent magnet 442 connected to the first fixed seat 431; and the second mover assembly 440 is provided with a second fixed seat 441 drivingly connected to the plurality of second cutter heads 311 and a second permanent magnet 442 connected to the second fixed seat 441.

[0108] In the present embodiment, the first permanent magnet 432 and the second permanent magnet 442 are fixedly installed on the first fixed seat 431 and the second fixed seat 441 respectively through bonding, clamping or other means, so as to reciprocate under the action of the changing electromagnetic field generated by the driving assembly, thereby driving the first cutting unit 200 and the second cutting unit 300 to perform trimming action.

[0109] The weight of the first fixed seat 431 is less than that of the second fixed seat 441. The materials of the first fixed seat 431 and the second fixed seat 441 can be the same or different. In order to reduce the difficulty of counterweighting the first fixed seat 431 and the second fixed seat 441, the first fixed seat 431 and the second fixed seat 441 are usually made of the same material, and the weight of the first fixed seat 431 is made less than that of the second fixed seat 441 by changing the sizes of the first fixed seat 431 and the second fixed seat 441. When the sizes of the first fixed seat 431 and the second fixed seat 441 are the same but the materials are different, the first fixed seat 431 can be made of light material such as aluminum alloy, and the second fixed seat 441 can be made of heavy material such as steel or copper, so as to realize the weight of the first fixed seat 431 less than that of the second fixed seat 441.

[0110] Since the weight of the permanent magnet is usually closely related to its magnetic properties, adjusting the weight on the fixed seat can 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 power device 400 will not be adversely affected by the counterweight adjustment, ensuring the driving efficiency and stability of the system. Secondly, the structure of the fixed seat is usually relatively simple and can be designed with various materials and structures. Therefore, it is more flexible to adjust the weight on the fixed seat. For example, the weight can be easily adjusted by selecting different materials or adding counterweight blocks, without involving the complex manufacturing process of the permanent magnet. This flexibility makes the counterweight adjustment more convenient and fast, reducing the complexity of design and manufacturing.

[0111] Further, the first fixed seat 431 includes a first fixed plate 433 drivingly connected to the first cutter head 211, and the second fixed seat 441 includes a second fixed plate 443 drivingly connected to the second cutter head 311, the size of the second fixed plate 443 being greater than that of the first fixed plate 433.

[0112] In the embodiment, the first fixed plate 433 and the second fixed plate 443 can have the same shape or different shapes. To more accurately and efficiently control the weight of the first fixed plate 433 and the second fixed plate 443, the first fixed plate 433 and the second fixed plate 443 are usually the same shape, such as a square or a circle. When the shape of the fixed plate is a square, the size refers to the width, length, and thickness of the first fixed plate 433 and the second fixed plate 443. When the shape of the fixed plate is a circle, the size refers to the diameter and height.

[0113] In the embodiment, the size of the first fixed plate 433 and the second fixed plate 443 is changed so that the weight of the first fixed seat 431 is less than the weight of the second fixed seat 441, which can improve the assembly efficiency of the hair trimmer 100. For example, if a counterweight is additionally provided, the counterweight needs to be fixedly connected with the fixed seat to realize assembly. If only the size is changed, no additional parts are needed, which improves the assembly efficiency of the hair trimmer 100.

[0114] In an embodiment, the thickness of the second fixed plate 443 is greater than the thickness of the first fixed plate 433.

[0115] In the embodiment, the thickness of the first fixed plate 433 and the second fixed plate 443 is changed so that the weight of the first fixed seat 431 is less than the weight of the second fixed seat 441, which can more accurately control the weight difference. By fine-tuning the thickness, a smaller weight increase or decrease can be achieved. Changing the material may cause a larger weight change and is difficult to accurately control. In addition, thickness adjustment does not require additional materials or complex processes, which can effectively control the manufacturing cost. For example, changing the thickness usually only needs to adjust the cutting or forming process of the material, while changing the material may need to redesign the mold or process flow, increasing manufacturing complexity. At the same time, by changing the thickness to adjust the weight, the weight difference 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 part.

[0116] In an embodiment, referring to FIGS. 10 and 12, the first cutting unit 200 and the second cutting unit 300 are arranged side by side; and both reciprocate along the first direction, the movement directions of the first mover assembly 430 and the second mover assembly 440 are opposite; the power device 400 further 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 mover assembly 430 and the second mover assembly 440 are arranged side by side and spaced apart on the first driving member 410 and the second driving member 420, respectively, and the first driving member 410 corresponds to the first mover assembly 430, and the second driving member 420 corresponds to the second mover assembly 440.

[0117] In the embodiment, the first cutting unit 200 and the second cutting unit 300 reciprocate in the first direction and in opposite directions. This design makes the vibrations generated by the movement of the two motor assemblies cancel each other out, reducing the vibration generated by the device during operation, thereby reducing noise and providing a quieter use environment for the user. Secondly, the first cutting unit 200 and the second cutting unit 300 are arranged side by side, which can simultaneously process more hair and improve the trimming efficiency. The side-by-side arrangement of the cutter heads can cover a larger trimming area, improving the trimming efficiency.

[0118] Secondly, the first driving member 410 and the second driving member 420 each include a coil. After being energized, the first driving member 410 and the second driving member 420 generate a changing electromagnetic field. The first motor assembly 430 and the second motor assembly 440 reciprocate under the action of the electromagnetic field of the first driving member 410 and the second driving member 420, respectively. Compared with a single driving system, a double driving system can provide higher overall power output because each driving member can independently provide driving capability. Each driving member is responsible for driving one motor assembly, which can more efficiently distribute power and avoid overloading a single driving member, thereby improving the overall operating efficiency of the device. Secondly, the double driving system can make the vibrations of the first motor assembly 430 and the second motor assembly 440 cancel each other out, reducing the overall vibration of the device. This design helps to provide a smoother operation experience and reduce user holding fatigue. In addition, the double driving system allows independent control and adjustment of the two motor assemblies. This enables the trimmer to adjust in different trimming modes or conditions, allowing the hair trimmer 100 to provide optimal performance and results in various scenarios. In addition, in a single driving system, a complex transmission mechanism is usually required to drive multiple motor assemblies simultaneously, which can increase the complexity and failure rate of the system. The double driving system can simplify the overall design by connecting each driving member to its corresponding motor assembly independently. The maintenance and replacement of each driving member are relatively independent, reducing the difficulty of maintenance and reducing the overall maintenance cost of the system.

[0119] In an embodiment, the first cutting unit 200 further includes a first transmission seat 224 and a plurality of first connecting shafts 226 connected to the first transmission seat 224, the first transmission seat 224 is connected to the first fixed seat 431, the plurality of first connecting shafts 226 are arranged correspondingly to the plurality of first cutter heads 211, and each first connecting shaft 226 is connected to a first cutter head 211; the second cutting unit 300 includes a second transmission seat 324 and at least one second connecting shaft 329 connected to the second transmission seat 324, the second transmission seat 324 is connected to the second fixed seat 441, and each second connecting shaft 329 is connected to a second cutter head; the total weight of the first transmission seat 224 and the first connecting shafts 226 is less than the total weight of the second transmission seat 324 and the second connecting shafts 329.

[0120] In the embodiment, the number of the first shafts 226 is two, and the number of the second shafts 329 is one. The first cutting unit 200 further comprises a first connecting seat, one of the first shafts 226 is integrally arranged with the first transmission seat 224, and the other first shafts 226 are arranged on the first connecting seat, and the first connecting seat is further sleeved on the first shaft 226 integrally arranged with the first transmission seat 224, so that the at least two first shafts 226 are arranged side by side and spaced apart. This arrangement can make the support of the first shaft 226 to the first cutter head 211 stronger and more stable, so that the plurality of first cutter heads 211 run smoothly. The first connecting seat and the other first shafts 226 can be made of plastic to reduce the weight. In order to reduce the weight difference between the total weight of the first shaft 226 and the first connecting seat and the weight of the second shaft 329, the second cutting unit 300 comprises a second connecting seat, one of the second shafts 329 is integrally arranged with the second transmission seat 324, and the second connecting seat is sleeved on the second shaft 329 integrally arranged with the second transmission seat 324. If the number of the second shafts 329 is two or more, the other second shafts 329 can be arranged on the second connecting seat. The second connecting seat and the other second shafts 329 can also be made of plastic to reduce the weight. In other embodiments, a plurality of shafts for connecting cutter heads can also be integrally made, or other arrangements of shafts can be used, which will not be described here.

[0121] In the embodiment, the weight of the first shaft 226 and the second shaft 329 can be the same, and the weight of the first transmission seat 224 is less than that of the second transmission seat 324. The weight of the first transmission seat 224 and the second transmission seat 324 can also be the same, and the weight of the first shaft 226 is less than that of the second shaft 329. The weight between the first transmission seat 224 and the second transmission seat 324 can also be different, and the weight between the first shaft 226 and the second shaft 329 can also be different, as long as the total weight of the first transmission seat 224 and the first shaft 226 is less than the total weight of the second transmission seat 324 and the second shaft 329. For example, because the number of the first shaft 226 is greater than the number of the second shaft 329, if the same material is used, the weight of the at least two first shafts 226 can be greater than that of the at least one second shaft 329. At this time, the total weight of the first transmission seat 224 and the first shaft 226 can be made smaller than the total weight of the second transmission seat 324 and the second shaft 329 by reducing the weight of the first transmission seat 224. This way makes the counterweight design more flexible.

[0122] Specifically, the weight of the first transmission seat 224 is less than that of the second transmission seat 324, or the total weight of the first transmission seat 224 and the first mover assembly 430 is less than that of the second transmission seat 324 and the second mover assembly 440.

[0123] In the embodiment, the weight of the first transmission seat 224 is less than that of the second transmission seat 324, so that the total weight of the first transmission seat 224 and the first connecting shaft 226 is less than that of the second transmission seat 324 and the second connecting shaft 329, the counterweight is more simple and accurate, and the number of the two groups of connecting shafts is inconsistent. If the counterweight is balanced on the connecting shaft, the structure and material need to be considered, which leads to more complex design and is not conducive to improving production efficiency.

[0124] Secondly, the total weight of the first transmission seat 224 and the first mover assembly 430 is less than that of the second transmission seat 324 and the second mover assembly 440. There are various embodiments, for example, when the weight of the first transmission seat 224 is the same as that of the second transmission seat 324, the weight of the first mover assembly 430 is less than that of the second mover assembly 440; when the weight of the first transmission seat 224 is less than that of the second transmission seat 324, the weight of the first mover assembly 430 can be the same as or different from that of the second mover assembly 440; when the weight of the first transmission seat 224 is greater than that of the second transmission seat 324, the weight of the first mover assembly 430 is less than that of the second mover assembly 440. Such a way makes the counterweight design more flexible, and the counterweight balance can be achieved by multiple components, avoiding the damage of the bearing component caused by the overloading of a single component.

[0125] Specifically, the first mover assembly 430 is provided with a first fixed seat 431 fixedly connected with the first transmission seat 224; the second mover assembly 440 is provided with a second fixed seat 441 fixedly connected with the second transmission seat 324; the first transmission seat 224 is provided with a first connecting plate 225 connected with the first fixed seat 431; the second transmission seat 324 is provided with a second connecting plate 325 fixedly connected with the second fixed seat 441 and a first side wall 326 protruding from the second connecting plate 325, the first side wall 326 extends towards the second mover assembly 440 and is located on the side wall of the second fixed seat 441, and the weight of the first transmission seat 224 is less than that of the second transmission seat 324.

[0126] In the embodiment, the first connecting plate 225 and the second connecting plate 325 can be square, circular or other shapes, and the first connecting plate 225 and the second connecting plate 325 can be the same weight or different weights, which is not limited herein. Compared with the first transmission seat 224, the second transmission seat 324 further comprises a first side wall 326, so that the weight of the first transmission seat 224 is less than the weight of the second transmission seat 324, so as to reduce the mass difference between the first cutting unit 200 and the second cutting unit 300. The first side wall 326 can be provided with one or more. When the first side wall 326 is one, the first side wall 326 can be located on the side wall of the second fixed seat 441 close to the first fixed seat 431, so that the weight of the first side wall 326 is applied to the middle of the hair trimmer 100, reducing vibration, avoiding the gravity of the first side wall 326 applied to the side wall, resulting in the stress imbalance of the second cutting unit 300 and increasing vibration, thereby generating noise.

[0127] When the first side wall 326 is provided with multiple, the first side wall 326 can be located on the side wall of the second fixed seat 441, so that the first side wall 326 can be provided with a larger volume and a larger weight, so as to reduce the weight difference between the first cutting unit 200 and the second cutting unit 300, thereby reducing vibration. By reducing vibration, the comfort of the user when using the device is greatly improved, and the holding is more stable and less likely to cause fatigue.

[0128] Further, the second connecting plate 325 further protrudes a second side wall 328 opposite to the first side wall 326, and the second fixed plate 443 is in a strip shape, and the first side wall 326 and the second side wall 328 are located on opposite sides of the second fixed plate 443 in the width direction.

[0129] In the embodiment, compared with the first transmission seat 224, the second transmission seat 324 further comprises the first side wall 326 and the second side wall 328, so that the adjustable weight range is larger. The first side wall 326 and the second side wall 328 can be the same weight or different weights. When the first side wall 326 and the second side wall 328 are the same weight, the first side wall 326 and the second side wall 328 are arranged on opposite sides of the second fixed seat 441, and such symmetrical design helps to uniformly distribute the weight, thereby maintaining the balance of the overall structure and reducing the generation of eccentric force. Secondly, the symmetrical distribution of the first side wall 326 and the second side wall 328 can better balance the stress of the second cutting unit 300, avoiding the problem of unstable structure caused by excessive stress on one side.

[0130] When the weights of the first side wall 326 and the second side wall 328 are different, the side wall with greater weight can be arranged between the second fixing base 441 and the first fixing base 431, so that the weight is applied to the middle part of the hair trimmer 100, thereby making the overall gravity center more concentrated, and the position close to the center can better balance the stress, avoiding the problem of tilting caused by the weight applied to the side of the hair trimmer 100.

[0131] Secondly, the two first side walls 326 are located on the opposite sides of the second fixing plate 443 in the width direction, and the length dimension of the first side wall 326 can be the same as the length dimension of the second fixing plate 443. When a certain weight needs to be reached, compared with arranging the two first side walls 326 on the opposite sides of the length direction of the second fixing plate 443, the height of the first side wall 326 in the embodiment is smaller, which avoids that the height of the first side wall 326 is too large to squeeze the space of other components, thereby ensuring that other components have sufficient installation and operation space. The arrangement of the embodiment makes the structure of the hair trimmer 100 more compact.

[0132] Further, the first side wall 326 is located between the second fixing plate 443 and the first fixing base 431, and the thickness of the first side wall 326 is greater than the thickness of the second side wall 328, so that the weight of the first side wall 326 is greater than the weight of the second side wall 328.

[0133] In the embodiment, compared with increasing the weight of the first side wall 326 by increasing the height, the weight of the first side wall 326 is increased by increasing the thickness, which can maintain the compactness of the overall structure, avoid that the height of the first side wall 326 is too large to squeeze the space of other components, and facilitate internal layout and design optimization. Secondly, the position close to the first fixing base 431 is close to the center of the device, and the first side wall 326 with greater weight arranged at this position not only helps to keep the gravity center of the device balanced, but also reduces the generation of eccentric force to reduce vibration. In addition, the first side wall 326 with greater thickness is arranged at a position close to the center of the device, rather than a position close to the edge of the device, which helps to reduce the volume of the hair trimmer 100. Since the main components of the hair trimmer 100 are arranged at the middle part of the device, they can be better protected. If the first side wall 326 is arranged at the edge of the device, the lateral volume of the device will increase, thereby increasing the volume of the hair trimmer 100.

[0134] In an embodiment, the thickness of the first connecting plate 225 is less than the thickness of the second connecting plate 325, so that the weight of the first connecting plate 225 is less than the weight of the second connecting plate 325.

[0135] In this embodiment, compared with increasing the width to increase the weight of the second connecting plate 325, by increasing the thickness of the second connecting plate 325 to make its weight greater than that of the first connecting plate 225, the compactness of the overall structure can be maintained, avoiding the connecting plate occupying too much lateral space, thereby leaving more space for the arrangement and installation of other components. Secondly, by increasing the weight by increasing the thickness, the center of gravity is more concentrated and stable, reducing the problem of center of gravity deviation caused by increasing the width. In addition, the thicker connecting plate has higher bending resistance, can provide better support and stability during work, improve the overall strength of the connecting plate, enhance its impact resistance and fatigue resistance, and prolong the service life.

[0136] In an embodiment, the first fixing seat 431 includes a first fixing plate 433 and two mounting protrusions 434 protruding from the first fixing plate 433 near the wall surface of the first connecting plate 225, and the wall surface of the first connecting plate 225 near the first fixing seat 431 is formed with a clearance space 225a adapted to the mounting protrusions 434; the wall surface of the first connecting plate 225 away from the clearance space 225a is provided with two connecting protrusions 227 corresponding to the clearance space 225a; the first cutting unit 200 further includes a fastener 228 penetrating the connecting protrusions 227 and the mounting protrusions 434 to fix the first transmission seat 224 and the first fixing seat 431.

[0137] In this embodiment, the fastener 228 can be a bolt, and further, the connecting protrusions 227 and the wall surface of the first connecting plate 225 away from the clearance space 225a enclose a connecting groove 227a for accommodating the head of the bolt. The mounting protrusions 434 and the connecting protrusions 227 serve to strengthen the local structural strength, increase the connecting thickness of the first mounting seat and the first fixing plate 433, and ensure that the connection between the first transmission seat 224 and the first fixing plate 433 is more stable. By multi-point fixing of the two mounting protrusions 434 and the first connecting plate 225, the strength and stability of the connection are further improved, avoiding looseness and instability that may be caused by single-point connection. Secondly, the mounting protrusions 434 and the clearance space 225a provide a clear positioning and mounting area, improving the installation precision and assembly efficiency, while also preventing slipping between components, ensuring stability during operation.

[0138] Further, the second fixing plate 443 is provided with mounting lugs 444 at opposite ends in the length direction thereof, and the first side wall 326 and the second side wall 328 are arranged on opposite sides of the second fixing plate 443 away from the mounting lugs 444.

[0139] In the embodiment, the mounting lugs 444 can be used to connect the elastic supporting components of the second mover assembly 440, such as elastic sheets and the like. It can be understood that the first fixed plate 433 is also provided with mounting lugs at opposite ends in the length direction, to connect the elastic supporting components of the first mover assembly 430. For example, the driving member and the mover assembly in the power device 400 are connected by elastic sheets, and the mounting lugs 444 are connected to the elastic sheets, which can not only enable the second mover assembly 430 to reciprocate in the first direction, but also reduce the vibration of the power device 400. The first side wall 326 is arranged away from the mounting lugs 444, which can avoid interference between the first side wall 326 and the mounting lugs 444 and other components, optimize the use of internal space, and make the structure of the hair trimmer 100 more compact. In addition, the first side wall 326 is arranged away from the mounting lugs 444, which can simplify the processing process, reduce complexity, and improve manufacturing precision and efficiency. Moreover, the first side wall 326 and the mounting lugs 444 do not interfere with each other during the mounting process, which simplifies the assembly process, improves assembly efficiency and reliability.

[0140] In an embodiment, the at least two first cutting heads 211 include a long hair cutting head (not labeled in the figure) and a first short hair cutting head (not labeled in the figure), and the at least one second cutting head 311 includes a second short hair cutting head (not labeled in the figure). The long hair cutting head is arranged between the first short hair cutting head and the second short hair cutting head.

[0141] In the embodiment, the long hair cutting head is used to trim longer hair to a medium or shorter length, to prepare for further trimming of the hair by the short hair cutting heads. The short hair cutting heads are used to trim shorter hair. The long hair cutting head is arranged between the two short hair cutting heads, which helps to simultaneously process longer hair and shorter hair, and improves trimming efficiency. For example, the long hair cutting head first cuts longer hair, and then the two short hair cutting heads on the sides perform more fine trimming. Moreover, this arrangement can closely fit the chin angle for beard removal, and is more convenient to use.

[0142] In an embodiment, the movement speed of the first mover assembly 430 is less than the movement speed of the second mover assembly 440.

[0143] In the embodiment, the first cutting head 211 includes a first moving cutter (not labeled in the figure) and a first stationary cutter (not labeled in the figure) covering the first moving cutter, and the second cutting head 311 includes a second moving cutter (not labeled in the figure) and a second stationary cutter (not labeled in the figure) covering the second moving cutter; the first moving cutter is drivingly connected to the first mover assembly 430, so that the first moving cutter reciprocates relative to the first stationary cutter in the first direction; the second moving cutter is drivingly connected to the second mover assembly 440, so that the second moving cutter reciprocates relative to the second stationary cutter in the first direction. The movement speed of the first mover assembly 430 is less than the movement speed of the second mover assembly 440, i.e., the movement speed of the first moving cutter is less than the movement speed of the second moving cutter.

[0144] The first moving cutter reciprocates relative to the second moving cutter in the first direction to shear the hair. The stroke of the first moving cutter assembly 430 can be set to be smaller than the stroke of the second moving cutter assembly 440, and the moving frequencies of the first moving cutter assembly 430 and the second moving cutter assembly 440 are substantially the same, so that the moving speed of the first moving cutter assembly 430 is smaller than the moving speed of the second moving cutter assembly 440, and the moving speed of the first moving cutter is smaller than the moving speed of the second moving cutter. The stroke refers to the maximum distance of the moving cutter moving in a single direction. It can be understood that the speed of the first moving cutter assembly 430 and the second moving cutter assembly 440 changes during reciprocating motion, and the moving speed of the first moving cutter assembly 430 and the second moving cutter assembly 440 can be the average speed, that is, the average speed of the first moving cutter assembly 430 is smaller than the average speed of the second moving cutter assembly 440.

[0145] Because the number of the first cutter heads 211 in the first cutting unit 200 is greater than the number of the second cutter heads 311 in the second cutting unit 300, the vibration of the first moving cutter in the first cutting unit 200 is greater, thereby causing greater noise. The moving speed of the first moving cutter is smaller than the moving speed of the second moving cutter, so that the total moving distance of the first moving cutter is shorter than the second moving cutter in unit time. That is, the total contact area of the plurality of first moving cutters and the first stationary cutter in the first cutting unit 200 is reduced, and the smaller contact area means that the friction area between the moving cutter and the stationary cutter is reduced, thereby reducing the friction force, and thus reducing the mechanical vibration and noise caused by friction.

[0146] To solve the above problems, the third scheme of the present application provides a hair trimmer 100.

[0147] Please refer to FIG. 15 to FIG. 21, the third scheme of the present application provides a hair trimmer 100, which can be an electric shaver or an electric hair clipper.

[0148] In the embodiments of the present application, referring to FIGS. 15-21, the hair trimmer 100 includes a first driving unit 110, a second driving unit 120, a first cutter head assembly 130, and a second cutter head assembly 140. The first cutter head assembly 130 includes at least two first cutter heads 131, and the second cutter head assembly 140 includes at least one second cutter head 141. The number of the first cutter heads 131 is greater than the number of the second cutter heads 141. The first cutter head 131 includes a first moving cutter 132 and a first stationary cutter 133 covering the first moving cutter 132. The first driving unit 110 is drivingly connected to the at least two first moving cutters 132 to drive the at least two first moving cutters 132 to reciprocate relative to the first stationary cutter 133 along a preset direction at a first speed. The second cutter head 141 includes a second moving cutter 142 and a second stationary cutter 143 covering the second moving cutter 142. The second driving unit 120 is drivingly connected to the at least one second moving cutter 142 to drive the at least one second moving cutter 142 to reciprocate relative to the second stationary cutter 143 along a preset direction at a second speed. The first speed is less than the second speed.

[0149] In the embodiments, the first driving unit 110 and the second driving unit 120 are linear motors or other motors, which can respectively include a first driving member 112 having a coil winding, a second driving member 122, a first moving member 113 having a permanent magnet, and a second moving member 123.

[0150] The first driving unit 110 and the second driving unit 120 can have the same specification or different specifications. The first cutter head assembly 130 includes two first cutter heads 131, and the second cutter head assembly 140 includes one second cutter head 141. The two first cutter heads 131 can be cutter heads with the same function or different functions. For example, the two first cutter heads 131 can be two short hair cutter heads 180 for trimming short hair, two long hair cutter heads 170 for trimming long hair, or one long hair cutter head 170 and one short hair cutter head 180, which can simultaneously trim long hair and short hair. In other embodiments, the first moving cutter 132 can be three, four, or more in number. The second moving cutter 142 can be two, three, or more in number, as long as the number of the first moving cutter 132 is greater than the number of the second moving cutter 142. The first stationary cutter 133 can be one or the same number as the first moving cutter 132, and the second stationary cutter 143 can be one or the same number as the second moving cutter 142.

[0151] The first driving unit 110 is connected to the at least two first moving knives 132 to drive the at least two first moving knives 132 to reciprocate relative to the first fixed knife 133 along a preset direction at a first speed; the second driving unit 120 is connected to the at least one second moving knife 142 to drive the at least one second moving knife 142 to reciprocate relative to the second fixed knife 143 along a preset direction at a second speed; the first speed is less than the second speed, so that in a unit time, the total contact area of the plurality of first moving knives 132 in the first knife head assembly 130 with the first fixed knife 133 is reduced, the smaller contact area means that the friction area between the moving knife and the fixed knife is reduced, thereby reducing the friction force, thereby reducing the mechanical vibration and noise caused by friction.

[0152] Secondly, the movement speed of the first moving knife 132 is slow, so that the movement stability of the first moving knife 132 is improved, and the situation of violent shaking of the first moving knife 132 is reduced, thereby reducing the total friction contact area and the number of contact points of the first moving knife 132, and avoiding the instantaneous high friction and vibration caused by violent shaking, thereby reducing the noise.

[0153] It can be understood that the first speed and the second speed can be average speed or instantaneous speed. For example, the first moving knife 132 and the second moving knife 142 reciprocate, in order to reduce the instantaneous impact when the moving knife reverses, the speed is slowed down when approaching the reverse point of the movement, and then the direction is converted, at this time the first speed and the second speed represent the average speed. In other embodiments, the first moving knife 132 and the second moving knife 142 can also move at a constant speed, at this time the first speed is continuously less than the second speed.

[0154] In an embodiment, the first speed and the second speed are average speeds.

[0155] In the present embodiment, the first moving knife 132 and the second moving knife 142 will slow down when approaching the reverse point of the movement, and then convert the direction to reduce the instantaneous impact when the moving knife reverses, thereby reducing the noise and vibration, and reducing the wear and tear, prolonging the service life of the knife head. Secondly, in the middle section of the movement, the moving knife cuts at a faster speed to ensure the efficiency of pruning. And when the speed is slow at both ends, the stability of the moving knife is improved, which can better handle details and reduce miscuts.

[0156] In an embodiment, the maximum distance of the first moving knife 132 reciprocating relative to the first fixed knife 133 is a first stroke, and the maximum distance of the second moving knife 142 reciprocating relative to the second fixed knife 143 is a second stroke; the first stroke is less than the second stroke; the difference between the movement frequencies of the first moving knife 132 and the second moving knife 142 is less than or equal to 5%.

[0157] In the embodiment, the motion frequency of the first moving blade 132 and the second moving blade 142 is small, and tends to be the same, which means that the motion period of the first moving blade 132 and the second moving blade 142 tends to be the same, that is, the time of the first moving blade 132 in the first stroke motion and the time of the second moving blade 142 in the second stroke motion tend to be the same, and the first stroke is smaller than the second stroke, so that the first speed is smaller than the second speed.

[0158] To realize that the first stroke is smaller than the second stroke, the following methods can be used: when the stroke specifications of the first driving unit 110 and the second driving unit 120 are consistent, the first stroke can be controlled to be smaller than the second stroke by limiting the power, voltage, etc. of the first driving unit 110; or a limiting structure for limiting the stroke of the first moving blade 132 can be arranged in the first blade head assembly 130, or the slide rail length of the first moving blade 132 is shorter than that of the second moving blade 142, so as to realize that the first stroke is smaller than the second stroke; or the stroke of the moving blade can also be accurately controlled by a software algorithm. For example, different adjustment parameters or different pulse width modulation frequencies and duty cycles can be set in the control system to control the strokes of different blade heads. When the specifications of the first driving unit 110 and the second driving unit 120 are inconsistent, the first driving unit 110 with a smaller stroke and the second driving unit 120 with a larger stroke are used.

[0159] By controlling that the first stroke is smaller than the second stroke, that is, the stroke of the blade head assembly with more blade heads is smaller than the stroke of the blade head assembly with fewer blade heads, the total contact area of the moving blade and the static blade of the first blade head assembly 130 can be further reduced, and the smaller contact area means that the friction area between the moving blade and the static blade is reduced, and then the friction force is reduced, so that the mechanical vibration and noise caused by friction are reduced. For example, in the case that the number of blade heads in the first blade head assembly 130 and the second blade head assembly 140 is inconsistent, if the strokes of the two blade head assemblies are the same, since the number of the first moving blade 132 is large, it means that the potential contact points between the first moving blade 132 and the first static blade 133 are also more in the same time, that is, the total contact area of the moving blade and the static blade of the blade head assembly with more blade heads is large, which leads to a large friction force, and thus a large noise is generated.

[0160] Secondly, when the first stroke of the first moving blade 132 is smaller than the second stroke of the second moving blade 142, it means that the contact area between any first moving blade 142 and the first static blade 143 is small in a single stroke, so that the total contact area of the moving blade and the static blade in the first blade head assembly 130 can be reduced, and then the noise is reduced.

[0161] In an embodiment, the stroke difference between the first stroke and the second stroke is not greater than 0.8 mm.

[0162] In the present embodiment, the specific strokes of the first stroke and the second stroke are not limited, when the volume of the hair trimmer 100 is small, the first stroke and the second stroke can be set to a smaller number, when the volume of the hair trimmer 100 is large, the first stroke and the second stroke can be set to a larger number, as long as the stroke difference between the first stroke and the second stroke is not greater than 0.8 mm, the stroke difference can be 0.8 mm, 0.7 mm, 0.6 mm, 0.5 mm or other difference. When the stroke difference between the first stroke and the second stroke is controlled within 0.8 mm, the noise generated by the first cutter head assembly 130 and the second cutter head assembly 140 during operation can be more effectively balanced, avoiding the problem of uneven noise caused by too large stroke difference. For example, mechanical vibration is one of the important sources of noise. When the stroke difference between the two cutter head assemblies is too large, they may vibrate at different frequencies and amplitudes, causing uneven distribution of noise in time and space. At the same time, a small stroke difference means that the friction difference between the two cutter head assemblies during operation is small, thereby reducing the noise and vibration caused by uneven friction.

[0163] Further, the first stroke is greater than or equal to 1.2 mm and less than or equal to 2.6 mm, and the second stroke is greater than or equal to 1.5 mm and less than or equal to 2.8 mm; the movement frequency of the first moving cutter and the second moving cutter is greater than or equal to 160 Hz and less than or equal to 210 Hz.

[0164] In the present embodiment, the first stroke of the first moving cutter 132 is small, suitable for fine trimming, and the second stroke of the second moving cutter 142 is large, suitable for rough trimming. For example, the first moving cutter 132 has a small stroke and moves at a slow speed, with higher control accuracy. In the motor drive system, lower speed movement is usually easier to achieve precise control. Because when the speed is slow, the control system has more time to respond and adjust to any possible deviation or disturbance. Therefore, the first moving cutter 132 moves at a slower speed, allowing the control system to more accurately control its position, speed and acceleration, thereby improving the overall control accuracy. High control accuracy ensures that the moving cutter can accurately trim small areas and detailed parts without damaging surrounding hair or skin. At the same time, the slow movement of the first moving cutter 132 makes the movement of the moving cutter more stable and less likely to shake, which helps to ensure that the trimming is neat and beautiful, especially for parts that need to be trimmed finely, such as the edges of the beard, the temples, around the ears, etc. Secondly, small stroke reduces the contact area and friction between the moving cutter and the static cutter, thereby reducing noise and wear, which helps to improve user experience and prolong the service life of the cutter head.

[0165] The second moving cutter 142 has a larger stroke and a faster movement speed, which is suitable for quickly trimming larger areas of hair, such as hair, large areas of beard or body hair. The larger stroke range can cut more hair in a shorter time, improving trimming efficiency. The required precision for rough trimming is lower, but speed and efficiency are required, so the design of the second moving cutter 142 is suitable for quickly processing longer or denser hair, providing a fast and effective trimming effect. Although the second moving cutter 142 has a faster speed, since the number is small, the system can better control its movement trajectory, avoiding violent shaking and noise.

[0166] In addition, the first stroke is set between 1.2mm-2.6mm, and the second stroke is set between 1.5mm-2.8mm, which can effectively cut hair of various lengths, meeting the needs of detailed trimming and processing longer hair without affecting the trimming effect. If the stroke is too small, for example, below 1.1mm, it may cause the cutter head to be unable to effectively cut longer hair, requiring more trimming times and reducing trimming efficiency. If the stroke is too large, for example, above 2.9mm, it may cause the cutter head to be difficult to control accurately, especially when trimming detailed parts, which is prone to produce uneven effects.

[0167] The movement frequency of the first moving cutter and the second moving cutter is set between 160Hz-210Hz, and preferably, the frequency of the first moving cutter and the second moving cutter is 190Hz, which can ensure that the moving cutter can move back and forth quickly and stably. If the movement frequency is too low, for example, below 160Hz, the reciprocating speed of the moving cutter will not be enough to deal with denser hair areas, which may result in incomplete cutting, the need to increase the number of trimming times, and not only reduce work efficiency, but also may exacerbate the wear of the cutter head and the skin due to repeated friction. If the movement frequency is too high, it will increase the load of the driving part, causing increased energy consumption and heat, and even possibly damaging the driving part.

[0168] In an embodiment, the output power of the first driving unit 110 is less than the output power of the second driving unit 120.

[0169] In this embodiment, if the specifications of the first driving unit 110 and the second driving unit 120 are the same, the output current of the first driving unit 110 can be adjusted to be less than the output current of the second driving unit 120 to control the power of both; the voltage of both can also be controlled to achieve the output power of the first driving unit 110 being less than the output power of the second driving unit 120. If the specifications of the first driving unit 110 and the second driving unit 120 are different, the resistance of the first driving unit 110 can be adjusted to be greater than the resistance of the second driving unit 120 to control the power of both.

[0170] By adjusting the output power of the driving element instead of the voltage, the complexity and development cost of the system are reduced, and the production efficiency is improved. For example, if the driving signal of the driving element is controlled by a software algorithm to adjust the stroke of the moving knife, the software parameters need to be frequently debugged and the control algorithm needs to be optimized, which increases the time and cost of software development and debugging. Second, adjusting the output power of the driving element is a direct and easy-to-implement method, and the adjustment and setting during manufacturing are simpler, reducing the complexity in production.

[0171] Further, the input current of the first driving unit 110 is less than the input current of the second driving unit 120.

[0172] In this embodiment, the specifications of the first driving unit 110 and the second driving unit 120 are the same, and the output power of the first driving unit 110 is controlled by controlling the input current of the first driving unit 110, which is less than the output power of the second driving unit 120.

[0173] Compared to adjusting the voltage to achieve the output power of the first driving unit 110 being less than the output power of the second driving unit 120, the current control in this embodiment can more accurately adjust the output power of the driving element, especially when the load changes, the current control can better maintain stable power output. For example, when the trimmer is close to the skin, it will encounter more hair, especially longer or denser hair, which will increase the mechanical resistance of the trimmer. When the cutter head of the trimmer contacts the skin, it will also increase the friction, increasing the resistance of the cutter head movement. Due to the increase in mechanical resistance, the motor needs more force to drive the cutter head, and more current is usually used to generate more power to overcome the increased load. Because the current control system can quickly detect current changes and adjust the driving signal in time, the cutter head movement is kept smooth to reduce noise. If the output power is adjusted by adjusting the voltage, when the load suddenly increases, the voltage control system may not respond in time, causing the voltage to drop instantaneously and the output power to be unstable.

[0174] At the same time, the current control method can better resist the influence of voltage fluctuations on the system, improving the stability and reliability of the system. In other words, voltage fluctuations can affect the performance of the driving element, while current control can provide more stable output. In addition, compared to a complex voltage regulation circuit, power regulation can be achieved by controlling the input current, which can simplify circuit design and reduce system complexity and cost.

[0175] Further, the hair trimmer 100 further comprises a current distributor connected to the power supply of the hair trimmer 100, the current distributor being connected to the input end of the first driving unit 110 and the input end of the second driving unit 120 respectively; the resistance value of the end of the current distributor connected to the first driving unit 110 is greater than the resistance value of the end connected to the second driving unit 120.

[0176] In the embodiment, the current distributor is connected to one end of the first driving unit 110 and is provided with a resistor with a resistance of R1, and is connected to one end of the second driving unit 120 and is provided with a resistor with a resistance of R2, where R1>R2. In this way, the current passing through the current distributor will preferentially flow to the end with the smaller resistance R2, i.e., the second driving unit 120, so as to achieve that the input current of the first driving unit 110 is less than the input current of the second driving unit 120. By providing different resistances in the current distributor, the current can be passively distributed, and the input current of the first driving unit 110 can be accurately achieved to be less than the input current of the second driving unit 120. Compared with an active current regulating circuit, this method is simpler and more direct, does not require a complex control circuit, simplifies circuit design, and reduces cost.

[0177] Further, the first driving unit 110 and the second driving unit 120 have the same specifications.

[0178] In the embodiment, the same specifications refer to that the rated stroke, performance, and parameters of the first driving unit 110 and the second driving unit 120 are the same, so as to ensure the consistency of products. The use of driving units with the same specifications simplifies the manufacturing process, reduces the time for production line adjustment and equipment switching, improves production efficiency, and improves production efficiency. The use of driving units with the same specifications can achieve standardized design of products, and facilitates product production line expansion and upgrading.

[0179] In an embodiment, referring to FIGS. 17 and 18, the first driving unit 110 includes a first coil winding 111, and the second driving unit 120 includes a second coil winding 121, and the resistance of the first coil winding 111 is greater than the resistance of the second coil winding 121.

[0180] In the embodiment, the first driving unit 110 and the second driving unit 120 have different specifications, the first coil winding 111 is arranged in the driving unit of the first driving unit 110, the second coil winding 121 is arranged in the driving unit of the second driving unit 120, and the resistance of the first driving unit 110 is greater than the resistance of the second driving unit 120, so that the output power of the first driving unit 110 is less than the output power of the second driving unit 120.

[0181] The resistance of the first coil winding 111 can be greater than the resistance of the second coil winding 121 in the following manner: for example, the first driving unit 110 can include a first magnetic member (not shown in the figure), and the second driving unit 120 can include a second magnetic member (not shown in the figure); the first magnetic member includes a first bottom plate and two first winding arms protruding from the first bottom plate, and the first coil winding 111 is wound around the first winding arms; the second magnetic member includes a second bottom plate and two second winding arms protruding from the second bottom plate, and the second coil winding 121 is wound around the second winding arms; and the number of turns of the first coil winding 111 is greater than the number of turns of the second coil winding 121.

[0182] Also, the wire diameter of the first coil winding can be smaller than that of the second coil winding, or the winding density of the first coil winding 111 can be greater than that of the second coil winding 121.

[0183] Since the resistance of the first coil winding 111 is greater than that of the second coil winding 121, the current of the first driving unit 110 is smaller than that of the second driving unit 120 under the same voltage. According to Ohm's law (I = U / R), the greater the resistance, the smaller the current, so that the power output by the first driving unit 110 is lower than that of the second driving unit 120. This setting does not require an additional current distributor, and the accurate control of current and power can be achieved by simply the difference in resistance.

[0184] In an embodiment, the output end of the first driving unit 110 is drivingly connected to the first cutter head assembly 130, and the output end of the second driving unit 120 is drivingly connected to the second cutter head assembly 140.

[0185] The mass of the first cutter head assembly 130 is greater than that of the second cutter head assembly 140, so that in the moving state, the load resistance of the output shaft of the first driving unit 110 is greater than that of the second driving unit 120.

[0186] In the embodiment, the masses of the first moving knives 132 and the second moving knives 142 are the same, and since the number of the first moving knives 132 is greater than that of the second moving knives 142, the mass of the first cutter head assembly 130 is greater than that of the second cutter head assembly 140, which can make the load resistance borne by the first driving unit 110 greater than that borne by the second driving unit 120 when working, so that the first stroke is smaller than the second stroke. In other words, the greater mass of the first cutter head assembly 130 means that it has greater mechanical resistance, so that the first driving unit 110 needs to overcome greater load resistance when working. Such load resistance mainly includes the inertia of the cutter head, the frictional resistance and the shear resistance of the hair. Within a certain time, the greater the load resistance, the movement speed and stroke of the driving member will be generally limited. That is, since the mass of the first cutter head assembly 130 is greater, the first driving unit 110 needs to overcome greater load resistance, so that the first stroke is smaller than the second stroke, thereby reducing the total contact area of the plurality of first moving knives 132 and the first stationary knife 133, and thus reducing the noise.

[0187] In an embodiment, referring to FIG. 17, the strokes of the first cutting heads 131 are the same, and the strokes of the second cutting heads 141 are the same; at least two first cutting heads 131 include a long hair cutting head 170 and a short hair cutting head 180, and at least one second cutting head 141 includes a short hair cutting head 180, and the long hair cutting head 170 is located between the two short hair cutting heads 180.

[0188] In the embodiment, the hair trimmer 100 has three cutting heads, two short hair cutting heads 180 and one long hair cutting head 170. The first cutting head assembly 130 includes the long hair cutting head 170 and the short hair cutting head 180, which can simultaneously process long hair and short hair. The long hair cutting head 170 is located between the two short hair cutting heads 180, which can effectively process the short hair on both sides while trimming the long hair, achieving a more comprehensive trimming effect. The short hair cutting head 180 of the second cutting head assembly 140 is suitable for processing short hair parts, and by applying different types of cutting heads in different areas, the working efficiency and flexibility of the trimmer can be improved.

[0189] Since the strokes of the first cutting heads 131 in the first cutting head assembly 130 are consistent, it helps to reduce vibration and noise between the first cutting heads 131. The strokes of the second cutting heads 141 in the second cutting head assembly 140 are consistent, which helps to reduce vibration and noise caused by the stroke difference of the second cutting heads 141.

[0190] Specifically, the hair trimmer 100 further includes a first transmission assembly 150 and a second transmission assembly 160, the first transmission assembly 150 is connected to at least two first moving knives 132, and the second transmission assembly 160 is connected to at least one second moving knife 142; the first transmission assembly 150 is fixedly connected to the output end of the first driving unit 110 to drive the first moving knife 132 to reciprocate along a predetermined direction; the second transmission assembly 160 is fixedly connected to the output end of the second driving unit 120 to drive the second moving knife 142 to reciprocate along a predetermined direction; the mass of the first transmission assembly 150 is less than the mass of the second transmission assembly 160.

[0191] In the embodiment, the materials of the first transmission assembly 150 and the second transmission assembly 160 can be the same or different. When the materials of the first transmission assembly 150 and the second transmission assembly 160 are different, the first transmission assembly 150 can use lightweight materials such as plastic or aluminum alloy, and the second transmission assembly 160 can use heavier materials such as steel or iron. When the materials of the first transmission assembly 150 and the second transmission assembly 160 are the same, the second transmission assembly 160 can be added with a counterweight to achieve the mass of the first transmission assembly 150 being less than the mass of the second transmission assembly 160.

[0192] The first transmission assembly 150 is connected to the first cutter head assembly 130, and the first transmission assembly 150 and the first cutter head assembly 130 together constitute the load of the first driving unit 110. The second transmission assembly 160 is connected to the second cutter head assembly 140, and the second transmission assembly 160 and the second cutter head assembly 140 together constitute the load of the second driving unit 120. The mass of the first cutter head assembly 130 is greater, and the mass of the first transmission assembly 150 is smaller, so as to balance the loads of the first driving unit 110 and the second driving unit 120, thereby reducing noise. For example, if the load of a single driving member is too heavy, it can generate greater vibration and impact, thereby causing noise.

[0193] Specifically, referring to FIGS. 18, 20 and 21, the first transmission assembly 150 includes a first base 151 and a first transmission rod 152. The first base 151 is connected to the output end of the first driving unit 110, and the first transmission rod 152 connects the first base 151 and the first cutter head assembly 130. The second transmission assembly 160 includes a second base 161 and a second transmission rod 162. The second base 161 is fixedly connected to the output end of the second driving unit 120, and the second transmission rod 162 connects the second base 161 and the second cutter head assembly 140. The mass of the first base 151 is smaller than the mass of the second base 161.

[0194] In the embodiment, the first base 151 and the second base 161 can have a square shape, a circular shape or other shapes. The first transmission rod 152 and the second transmission rod 162 can have a long strip cylindrical shape or a long strip cuboid shape, which is not limited herein. The first transmission rod 152 can include a plurality of integrally formed connecting rods, or a mounting seat including a plurality of connecting rods can be additionally provided to connect a plurality of first cutter heads 131. The materials of the first base 151 and the second base 161 can be the same or different. When the materials of the first base 151 and the second base 161 are different, the first base 151 can be made of a light material such as plastic or aluminum alloy, and the second base 161 can be made of a heavier material such as steel or iron. When the materials of the first base 151 and the second base 161 are the same, the second base 161 can be additionally provided with a counterweight to achieve the mass of the first base 151 being smaller than the mass of the second base 161. For example, a counterweight can be added to the second base 161 to make the mass of the second base 161 greater than the mass of the first base 151.

[0195] The mass of the transmission assembly can be more accurately controlled by adjusting the mass of the base. Compared with changing other parts, adjusting the mass of the base has a more direct and easy-to-control effect on the overall system, simplifying the design and production process. For example, if the transmission rods in the transmission assembly are changed, the transmission rods are connected to the cutter heads. If the materials of the two transmission rods are the same, in order to change the mass of the transmission rod, only the size or the counterweight can be changed. Both of these two ways need to consider the connection and matching relationship with the cutter heads, making the design more complex.

[0196] In an embodiment, the first transmission rod 152 is sleeved with a first buffer sleeve, and the first buffer sleeve is connected to the first moving blade 132; the second transmission rod 162 is sleeved with a second buffer sleeve, and the second buffer sleeve is connected to the second moving blade 142.

[0197] In the embodiment, the first transmission rod 152 is fixedly connected to the first base 151, and the second transmission rod 162 is fixedly connected to the second base 161. The first buffer sleeve and the second buffer sleeve can be made of silica gel, rubber or other materials having a buffering effect. The vibration generated by the transmission rod during operation can be effectively reduced. These materials can absorb and buffer the vibration generated by the direct collision of the transmission rod with the moving blade when the transmission rod moves, thereby reducing the propagation of noise.

[0198] In an embodiment, the first moving blade 132 and the second moving blade 142 are arranged side by side, and the moving directions of the first moving blade 132 and the second moving blade 142 are opposite. In this way, the vibrations generated by the first moving blade 132 and the second moving blade 142 when moving are offset, reducing the vibration generated by the device during operation, thereby reducing noise.

[0199] The multi-blade hair trimmer integrates multiple independent blades, aiming to improve trimming efficiency and flexibility, and is suitable for different length and density hair trimming needs, providing users with a diversified shaving experience.

[0200] In the prior art, the cutting unit of the multi-blade hair trimmer usually includes multiple blades, and the multiple cutting units are synchronously driven to improve trimming efficiency. However, the structure of the cutting unit is complex, and due to the limitation of the number of blades or machining precision, the weights of different cutting units are inconsistent, causing uneven vibration of the hair trimmer, thereby generating a large amount of noise.

[0201] The above content is only used to assist in understanding the technical solutions of the application and does not represent the acknowledgement of the above content as prior art.

[0202] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not drive 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, wherein, The first motion unit, the second motion unit and the driving mechanism are included. The first motion unit includes a first tool head assembly and a first transmission assembly, and the first transmission assembly is in transmission connection with the driving mechanism and the first tool head assembly. The first tool head assembly includes at least two first tool heads, and the second tool head assembly includes at least one second tool head. The mass of the first transmission assembly is less than the mass of the second transmission assembly.

2. The hair trimmer of 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 of claim 2, wherein, The mass of the first moving part is less than the mass of the second moving part.

4. The hair trimmer of claim 2, wherein, The first moving part includes a first mounting frame and a first permanent magnet arranged 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 of claim 4, wherein, The mass of the first mounting frame is less than the mass of the second mounting frame.

6. The hair trimmer of claim 5, wherein, The first mounting frame includes a first mounting block fixedly connected to the first transmission assembly, and the second mounting frame includes a second mounting block fixedly connected to the second transmission assembly.

7. The hair trimmer of claim 4, wherein, The first transmission assembly includes a first transmission seat and at least two first transmission rods connected to the first transmission seat, and the first transmission seat is connected to the first mounting frame. The second transmission assembly includes a second transmission seat and at least one second transmission rod connected to the second transmission seat, and the second transmission seat is connected to the second mounting frame.

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

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

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

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

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

13. The hair trimmer of claim 9, wherein, The first mounting frame comprises a first mounting block and two mounting protrusions protruding from the first mounting block near the wall surface of the first bottom plate, and the wall surface of the first bottom plate near the first mounting frame is formed with a clearance space matched with the mounting protrusions; the wall surface of the first bottom plate away from the first mounting frame is provided with two connecting protrusions corresponding to the clearance space; The first moving unit further comprises a fastener, which is arranged through the connecting protrusions and the mounting protrusions to fix the first transmission seat and the first mounting frame.

14. The hair trimmer of any one of claims 1 to 13, wherein, 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 of claim 14, wherein, The at least two first cutter heads comprise a long whisker cutter head and a first short whisker cutter head, and the at least one second cutter head comprises a second short whisker cutter head, and the long whisker cutter head is arranged between the first short whisker cutter head and the second short whisker cutter head.

16. The hair trimmer of claim 14, wherein, The first cutter head comprises a first moving cutter and a first static cutter covering the first moving cutter, and the second cutter head comprises a second moving cutter and a second static cutter covering the second moving cutter; The first moving cutter is drivingly connected to the first transmission assembly, so that the first moving cutter reciprocates along the preset direction relative to the first static cutter; The second moving cutter is drivingly connected to the second transmission assembly, so that the second moving cutter reciprocates along the preset direction relative to the second static cutter; The stroke of the first moving cutter is smaller than the stroke of the second moving cutter, and the deviation of the movement frequency of the first moving cutter and the second moving cutter is less than or equal to 5%.

17. A hair trimmer, wherein, Comprise: A first cutting unit is provided with a plurality of first cutter heads; A second cutting unit is provided with at least one second cutter head, the number of first cutter heads is greater than the number of second cutter heads, and the weight of the first cutting unit is greater than the weight of the second cutting unit; A power device is provided with a first mover assembly and a second mover assembly, the first mover assembly is drivingly connected to the first cutting unit, the second mover assembly is drivingly connected to the second cutting unit, and the weight of the second mover assembly is greater than the weight of the first mover assembly.

18. The hair trimmer of claim 17, wherein, The first mover assembly is provided with a first fixed seat drivingly connected to a plurality of first cutter heads and a first permanent magnet connected to the first fixed seat; the second mover assembly is provided with a second fixed seat drivingly connected to a plurality of second cutter heads and a second permanent magnet connected to the second fixed seat.

19. The hair trimmer of claim 18, wherein, The weight of the second fixed seat is greater than the weight of the first fixed seat.

20. The hair trimmer of claim 19, wherein, The first fixed seat comprises a first fixed plate drivingly connected to the first cutter head, and the second fixed seat comprises a second fixed plate drivingly connected to the second cutter head, and the size of the second fixed plate is greater than the size of the first fixed plate.

21. The hair trimmer of claim 20, wherein, The thickness of the second fixed plate is greater than the thickness of the first fixed plate.

22. The hair trimmer of claim 17, wherein, The first cutting unit and the second cutting unit are arranged side by side and reciprocate along a first direction, and the movement directions of the first mover assembly and the second mover assembly are opposite; The power device comprises a first driving member and a second driving member, the first driving member and the second driving member are arranged side by side and spaced apart, the first mover assembly and the second mover assembly are arranged spaced apart from the first driving member and the second driving member respectively, and the first driving member corresponds to the first mover assembly, and the second driving member corresponds to the second mover assembly.

23. The hair trimmer of any one of claims 17 to 22, wherein, The first cutting unit further comprises a first transmission seat and a plurality of first connecting shafts connected to each other, the first transmission seat is connected to the first mover assembly, a plurality of the first connecting shafts are arranged corresponding to a plurality of the first tool heads, and each of the first connecting shafts is connected to the first tool head; The second cutting unit further comprises a second transmission seat and at least one second connecting shaft connected to each other, the second transmission seat is connected to the second mover assembly, and each of the second connecting shafts is connected to the second tool head; the total weight of the second transmission seat and the second connecting shaft is greater than the total weight of the first transmission seat and the first connecting shaft.

24. The hair trimmer of claim 23, wherein, The first mover assembly is provided with a first fixed seat fixedly connected to the first transmission seat; the second mover assembly is provided with a second fixed seat fixedly connected to the second transmission seat; The first transmission seat is provided with a first connecting plate fixedly connected to the first fixed seat, the second transmission seat is provided with a second connecting plate fixedly connected to the second fixed seat and a first side wall protruding from the second connecting plate, the first side wall extends towards the second mover assembly and is located on the side wall of the second fixed seat, and the weight of the second transmission seat is greater than the weight of the first transmission seat.

25. The hair trimmer of claim 24, wherein, The second connecting plate is provided with a second side wall opposite to the first side wall, the first side wall is located between the first fixed seat and the second fixed seat, and the thickness of the first side wall is greater than the thickness of the second side wall; And / or, the thickness of the second connecting plate is greater than the thickness of the first connecting plate.

26. The hair trimmer of claim 17, wherein, The movement speed of the first mover assembly is less than the movement speed of the second mover assembly.

27. A hair trimmer wherein, The power device comprises a first driving unit, a second driving unit, a first tool head assembly and a second tool head assembly, wherein, The first tool head assembly comprises at least two first tool heads, and the second tool head assembly comprises at least one second tool head, and the number of the first tool heads is greater than the number of the second tool heads; The first tool head comprises a first moving cutter and a first static cutter covering the first moving cutter, and the first driving unit is drivingly connected to at least two first moving cutters to drive at least two first moving cutters to reciprocate relative to the first static cutter along a preset direction at a first speed; The second tool head comprises a second moving cutter and a second static cutter covering the second moving cutter, and the second driving unit is drivingly connected to at least one second moving cutter to drive at least one second moving cutter to reciprocate relative to the second static cutter along the preset direction at a second speed; The first speed is less than the second speed.

28. The hair trimmer of claim 27, wherein, The first speed and the second speed are average speeds.

29. The hair trimmer of claim 27, wherein, The maximum distance of the first moving cutter reciprocating relative to the first static cutter is a first stroke, and the maximum distance of the second moving cutter reciprocating relative to the second static cutter is a second stroke; The first stroke is less than the second stroke. The difference between the motion frequencies of the first moving cutter and the second moving cutter is less than or equal to 5%.

30. The hair trimmer of claim 29, wherein, The stroke difference between the first stroke and the second stroke is not greater than 0.8 mm.

31. The hair trimmer of claim 29, wherein, The first stroke is greater than or equal to 1.2 mm and less than or equal to 2.6 mm, and the second stroke is greater than or equal to 1.5 mm and less than or equal to 2.8 mm. The motion frequency of the first moving cutter and the second moving cutter is greater than or equal to 160 Hz and less than or equal to 210 Hz.

32. The hair trimmer of claim 27, wherein, The output power of the first driving unit is less than the output power of the second driving unit.

33. The hair trimmer of claim 32, wherein, The input current of the first driving unit is less than the input current of the second driving unit.

34. The hair trimmer of claim 33, wherein, The specifications of the first driving unit and the second driving unit are the same.

35. The hair trimmer of claim 32, wherein, The first driving unit includes a first coil winding, and the second driving unit includes a second coil winding, and the resistance of the first coil winding is greater than the resistance of the second coil winding.

36. The hair trimmer of claim 27 wherein, The output end of the first driving unit is drivingly connected to the first cutter head assembly, and the output end of the second driving unit is drivingly connected to the second cutter head assembly. The mass of the first cutter head assembly is greater than the mass of the second cutter head assembly, and the load resistance of the output shaft of the first driving unit is greater than the load resistance of the output shaft of the second driving unit.

37. A hair trimmer as claimed in any of claims 27 to 36 wherein, The hair trimmer further comprises a first transmission assembly and a second transmission assembly, the first transmission assembly is connected to at least two first moving cutters, and the second transmission assembly is connected to at least one second moving cutter. The first transmission assembly is fixedly connected to the output end of the first driving unit to drive the first moving cutter to reciprocate in a predetermined direction. The second transmission assembly is fixedly connected to the output end of the second driving unit to drive the second moving cutter to reciprocate in a predetermined direction. The mass of the first transmission assembly is less than the mass of the second transmission assembly.

38. The hair trimmer of claim 37, wherein, The first transmission assembly includes a first base and a first transmission rod, the first base is connected to the output end of the first driving unit, and the first transmission rod connects the first base and the first cutter head assembly. The second transmission assembly includes a second base and a second transmission rod, the second base is fixedly connected to the output end of the second driving unit, and the second transmission rod connects the second base and the second cutter head assembly. The mass of the first base is less than the mass of the second base.

39. The hair trimmer of claim 29, wherein, The strokes of each first cutter head are the same, and the strokes of each second cutter head are the same. The first cutter head assembly includes a long hair cutter head and a short hair cutter head, the second cutter head assembly includes a short hair cutter head, and the long hair cutter head is located between the two short hair cutter heads.

40. The hair trimmer of claim 27 wherein, The first moving cutter and the second moving cutter are arranged side by side, and the motion directions of the first moving cutter and the second moving cutter are opposite.

Images