Hair trimmer

Abstract

The embodiment of the invention discloses a hair trimmer which comprises a first driving unit, a second driving unit, a first tool bit assembly and a second tool bit assembly, and the first tool bit assembly comprises a first tool bit; the second tool bit assembly comprises second tool bits, and the number of the first tool bits is larger than that of the second tool bits. The first tool bit comprises first moving cutters and first static cutters, and the first driving unit is in transmission connection with the at least two first moving cutters so as to drive the at least two first moving cutters to reciprocate at a first speed in the preset direction relative to the first static cutters; the second cutter head comprises a second moving cutter and a second static cutter, and the second driving unit is in transmission connection with the at least one second moving cutter so as to drive the at least one second moving cutter to reciprocate at a second speed in the preset direction relative to the second static cutter; the first speed is less than the second speed. According to the hair trimmer, the first speed is set to be smaller than the second speed, so that the friction area of the first movable cutter and the first static cutter in unit time is reduced, and noise is reduced.

Description

Technical Field

[0001] This application relates to the field of hair trimming technology, and in particular to a hair trimmer. Background Technology

[0002] Multi-blade hair trimmers have multiple blades, which can effectively expand the trimming area and are suitable for a variety of different trimming scenarios, such as trimming long and short hair at the same time.

[0003] In existing technologies, multiple identical motors typically drive multiple cutter head groups, with each motor controlling the speed of the cutter head groups to be the same. When the number of cutters is odd, the number of cutters driven by different motors varies; some motors drive cutter head groups with more cutters, while others drive those with fewer. However, because the number of cutters in different cutter head groups is inconsistent, when the motors control the speed of different cutter head groups to be the same, the total contact area between the moving and stationary cutters in the cutter head groups with more cutters is larger per unit time, resulting in higher noise levels.

[0004] The above content is only used to help understand the technical solution of the invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a hair trimmer, which aims to solve the technical problem that when the number of blades in two blade groups is inconsistent, the contact area between the moving blade and the stationary blade in the blade group with more blades is larger, resulting in greater noise.

[0006] To achieve the above objectives, the hair trimmer proposed in this invention includes a first drive unit, a second drive unit, a first blade assembly, and a second blade assembly, wherein...

[0007] The first cutter head assembly includes at least two first cutters; the second cutter head assembly includes at least one second cutter head, and the number of first cutters is greater than the number of second cutters.

[0008] The first cutter head includes a first moving cutter and a first stationary cutter covering the first moving cutter. The first drive unit is connected to at least two of the first moving cutters to drive the at least two first moving cutters to reciprocate relative to the first stationary cutter in a preset direction at a first speed.

[0009] The second cutter head includes a second moving cutter and a second stationary cutter covering the second moving cutter. The second drive unit is driven to at least one of the second moving cutters to drive at least one of the second moving cutters to reciprocate relative to the second stationary cutter along the preset direction at a second speed.

[0010] The first speed is less than the second speed.

[0011] In one embodiment, the first speed and the second speed are average speeds.

[0012] In one embodiment, the maximum distance of the reciprocating motion of the first moving blade relative to the first stationary blade is the first stroke, and the maximum distance of the reciprocating motion of the second moving blade relative to the second stationary blade is the second stroke;

[0013] The first stroke is shorter than the second stroke;

[0014] The first moving blade and the second moving blade move at the same frequency.

[0015] In one embodiment, the difference between the first stroke and the second stroke is no greater than 0.8 mm.

[0016] In one embodiment, 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.

[0017] The movement frequencies of the first and second moving blades are greater than or equal to 160Hz and less than or equal to 210Hz. In one embodiment, the output power of the first drive unit is less than the output power of the second drive unit.

[0018] In one embodiment, the input current of the first driving unit is less than the input current of the second driving unit.

[0019] In one embodiment, the first driving unit and the second driving unit have the same specifications.

[0020] In one embodiment, the first driving unit includes a first coil winding, 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.

[0021] In one embodiment, the output end of the first drive unit is driven to the first cutter head assembly, and the output end of the second drive unit is driven to the second cutter head assembly;

[0022] 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 drive unit is greater than the load resistance of the output shaft of the second drive unit.

[0023] In one embodiment, the hair trimmer further includes a first transmission assembly and a second transmission assembly, wherein the first transmission assembly is connected to at least two first moving blades, and the second transmission assembly is connected to at least one second moving blade;

[0024] The first transmission component is fixedly connected to the output end of the first drive unit to drive the first moving blade to reciprocate along a preset direction;

[0025] The second transmission component is fixedly connected to the output end of the second drive unit to drive the second moving blade to reciprocate along a preset direction;

[0026] The mass of the first transmission component is less than the mass of the second transmission component.

[0027] In one embodiment, the first transmission assembly includes a first base and a first transmission rod, the first base being connected to the output end of the first drive unit, and the first transmission rod being connected to the first base and the first cutter head assembly;

[0028] 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 drive unit, and the second transmission rod connects the second base and the second cutter head assembly.

[0029] The mass of the first base is less than the mass of the second base.

[0030] In one embodiment, the stroke of each first cutter head is the same, and the stroke of each second cutter head is the same;

[0031] The first cutter head assembly includes a long-bearded cutter head and a short-bearded cutter head, and the second cutter head assembly includes a short-bearded cutter head, with the long-bearded cutter head located between the two short-bearded cutter heads.

[0032] In one embodiment, the first moving blade and the second moving blade are arranged side by side, and the first moving blade and the second moving blade move in opposite directions.

[0033] The present invention is driven by a first driving unit connected to at least two first moving blades to drive the at least two first moving blades to reciprocate relative to a first stationary blade in a preset direction at a first speed; a second driving unit is driven by at least one second moving blade to drive the at least one second moving blade to reciprocate relative to a second stationary blade in a preset direction at a second speed; the first speed is less than the second speed, so that in a unit of time, the total contact area between the multiple first moving blades and the first stationary blade in the first blade assembly with a large number of blades is reduced. The smaller contact area means that the friction area between the moving blade and the stationary blade is reduced, thereby reducing the friction force and thus reducing the mechanical vibration and noise caused by friction.

[0034] Secondly, the slower movement speed of the first moving cutter improves its stability and reduces the occurrence of violent shaking. This reduces the total frictional contact area and the number of contact points of the first moving cutter, while also avoiding instantaneous high friction and vibration caused by violent shaking, thus reducing noise. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of an embodiment of the hair trimmer of the present invention is shown;

[0037] Figure 2 for Figure 1 Exploded view of the structure of a medium-sized hair trimmer;

[0038] Figure 3 for Figure 1 Another exploded view of the structure of the mid-length hair trimmer;

[0039] Figure 4 for Figure 1 Cross-sectional view of a medium-sized hair trimmer;

[0040] Figure 5 for Figure 1 A cross-sectional view of a medium-sized hair trimmer from another angle;

[0041] Figure 6 for Figure 3 A schematic diagram of the structure of the first transmission component;

[0042] Figure 7 for Figure 3 A schematic diagram of the structure of the second transmission component.

[0043] Explanation of icon numbers:

[0044] label name label name label name 100 hair trimmer 110 First drive unit 111 First coil winding 120 Second drive unit 121 Second coil winding 130 First cutter head assembly 131 First cutter head 132 First incision 133 First Still Blade 140 Second cutter head assembly 141 Second cutter head 142 Second incision 143 Second still knife 150 First transmission component 151 First base 152 First transmission rod 160 Second transmission component 161 Second base 162 Second transmission rod 170 Long-bearded knife head 180 Short razor head 112 First driving component 113 First moving part 122 Second drive unit 123 Second moving part

[0045] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0048] Furthermore, if the embodiments of the present invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text is to include three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B.

[0049] This invention proposes a hair trimmer 100, which can be an electric shaver or an electric hair clipper.

[0050] In the embodiments of the present invention, please refer to Figures 1 to 7The hair trimmer 100 includes a first drive unit 110, a second drive unit 120, a first blade assembly 130, and a second blade assembly 140. The first blade assembly 130 includes at least two first blades 131; the second blade assembly 140 includes at least one second blade 141, and the number of first blades 131 is greater than the number of second blades 141. Each first blade 131 includes a first moving blade 132 and a first stationary blade 133 covering the first moving blade 132. The first drive unit 110 is tractively connected to at least two first moving blades 132 to drive the at least two first moving blades 132 to reciprocate relative to the first stationary blade 133 in a preset direction at a first speed. Each second blade 141 includes a second moving blade 142 and a second stationary blade 143 covering the second moving blade 142. The second drive unit 120 is tractively connected to at least one second moving blade 142 to drive the at least one second moving blade 142 to reciprocate relative to the second stationary blade 143 in a preset direction at a second speed. The first speed is less than the second speed.

[0051] In this embodiment, the first drive unit 110 and the second drive unit 120 are linear motors or other motors, and may respectively include a first drive member 112 and a second drive member 122 with coil windings, and a first moving member 113 and a second moving member 123 with permanent magnets.

[0052] The specifications of the first drive unit 110 and the second drive unit 120 can be the same or different. 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 cutter heads with different functions. For example, they can be two short-hair cutter heads 180 for trimming shorter hair, two long-hair cutter heads 170 for trimming longer hair, or one long-hair cutter head 170 and one short-hair cutter head 180, which can trim longer and shorter hair simultaneously. In other embodiments, there can be three, four or more first moving cutter heads 132. There can be two, three or more second moving cutter heads 142, as long as the number of first moving cutter heads 132 is greater than the number of second moving cutter heads 142. There can be one first stationary cutter head 133 or the same number as the first moving cutter head 132, and there can be one second stationary cutter head 143 or the same number as the second moving cutter head 142.

[0053] The present invention is driven by a first drive unit 110 connected to at least two first moving blades 132 to drive at least two first moving blades 132 to reciprocate relative to a first stationary blade 133 in a preset direction at a first speed; a second drive unit 120 is driven by at least one second moving blade 142 to drive at least one second moving blade 142 to reciprocate relative to a second stationary blade 143 in a preset direction at a second speed; the first speed is less than the second speed, so that in a unit of time, the total contact area between the multiple first moving blades 132 and the first stationary blade 133 in the first blade assembly 130 with a large number of blades is reduced. The smaller contact area means that the friction area between the moving blade and the stationary blade is reduced, thereby reducing the friction force and thus reducing the mechanical vibration and noise caused by friction.

[0054] Secondly, the slower movement speed of the first moving cutter 132 improves the stability of its movement, reduces the occurrence of violent shaking, thereby reducing the total frictional contact area and the number of contact points of the first moving cutter 132. At the same time, it avoids instantaneous high friction and vibration caused by violent shaking, thus reducing noise.

[0055] It is understandable that the first and second velocities can be average velocities or instantaneous velocities. For example, when the first moving blade 132 and the second moving blade 142 reciprocate, to reduce the instantaneous impact when the blades reverse direction, the speed will slow down near the reversal point before changing direction. In this case, the first and second velocities represent average velocities. In other embodiments, the first moving blade 132 and the second moving blade 142 can also move at constant speeds, in which case the first speed is consistently lower than the second speed.

[0056] In one embodiment, the first speed and the second speed are average speeds.

[0057] In this embodiment, the first moving blade 132 and the second moving blade 142 reduce their speed and change direction as they approach the reversal point of their movement. This reduces the instantaneous impact during the reversal of the moving blades, thereby reducing noise and vibration, as well as wear and extending the service life of the blades. Secondly, in the middle section of the movement, the moving blades cut at a relatively high speed, ensuring efficient trimming. At the slower speeds at both ends, the stability of the moving blades is improved, allowing for better handling of details and reducing accidental cuts.

[0058] In one embodiment, the maximum distance of the reciprocating motion of the first moving blade 132 relative to the first stationary blade 133 is the first stroke, and the maximum distance of the reciprocating motion of the second moving blade 142 relative to the second stationary blade 143 is the second stroke; the first stroke is less than the second stroke; and the difference in motion frequency between the first moving blade 132 and the second moving blade 142 is less than or equal to 5%.

[0059] In this embodiment, the movement frequencies of the first moving blade 132 and the second moving blade 142 are small and close to the same, which means that the movement cycles of the first moving blade 132 and the second moving blade 142 are close to the same. That is, the time for the first moving blade 132 to move in the first stroke and the time for the second moving blade 142 to move in the second stroke are close to the same, and the first stroke is shorter than the second stroke, thereby making the first speed less than the second speed.

[0060] To achieve a first stroke shorter than the second stroke, the following methods can be used: When the stroke specifications of the first drive unit 110 and the second drive unit 120 are the same, the first stroke can be controlled to be shorter than the second stroke by limiting the power, voltage, etc. of the first drive unit 110; alternatively, a limiting structure can be set in the first cutter head assembly 130 to limit the stroke of the first moving cutter 132, or the slide rail length of the first moving cutter 132 can be shorter than the slide rail length of the second moving cutter 142, to achieve a first stroke shorter than the second stroke; alternatively, the drive signal of the drive component can be precisely controlled by software algorithms to adjust the stroke of the moving cutter. For example, different adjustment parameters or different pulse width modulation frequencies and duty cycles can be set in the control system to control the stroke of different cutter heads. When the specifications of the first drive unit 110 and the second drive unit 120 are inconsistent, the first drive unit 110 with a smaller stroke and the second drive unit 120 with a larger stroke can be used.

[0061] This invention, by controlling the first stroke to be shorter than the second stroke (i.e., the stroke of the cutter assembly with more cutters is shorter than that of the cutter assembly with fewer cutters), can further reduce the total contact area between the moving and stationary cutters of the first cutter assembly 130. A smaller contact area means a smaller friction area between the moving and stationary cutters, thereby reducing friction and thus lowering mechanical vibration and noise caused by friction. For example, when the number of cutters in the first cutter assembly 130 and the second cutter assembly 140 is different, if the strokes of the two cutter assemblies are the same, the larger number of first moving cutters 132 means that there are more potential contact points between the first moving cutter 132 and the first stationary cutter 133 in the same amount of time. That is, the cutter assembly with more cutters has a larger total contact area between the moving and stationary cutters, resulting in greater friction and thus generating more noise.

[0062] Secondly, when the first stroke of the first moving cutter 132 is less than the second stroke of the second moving cutter 142, it means that in a single stroke, the contact area between either the first moving cutter 142 and the first stationary cutter 143 is smaller. Therefore, the total contact area between the moving cutter and the stationary cutter in the first cutter head assembly 130 can be reduced, thereby reducing noise.

[0063] In one embodiment, the difference between the first stroke and the second stroke is no greater than 0.8 mm.

[0064] In this embodiment, the specific strokes of the first and second strokes are not limited. When the hair trimmer 100 is small, the first and second strokes can be set to smaller numbers; when the hair trimmer 100 is large, the first and second strokes can be set to larger numbers, as long as the stroke difference between the first and second strokes is not greater than 0.8mm. The stroke difference can be 0.8mm, 0.7mm, 0.6mm, 0.5mm, or other values. When the stroke difference between the first and second strokes is controlled within 0.8mm, 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 noise imbalance problem caused by excessive 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, resulting in an uneven distribution of noise in time and space. At the same time, a smaller stroke difference means that the friction difference between the two cutter head assemblies is smaller during operation, thereby reducing noise and vibration caused by uneven friction.

[0065] Furthermore, the first stroke is greater than or equal to 1.2 mm and less than or equal to 2.6 mm, 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 and second moving blades is greater than or equal to 160 Hz and less than or equal to 210 Hz.

[0066] In this embodiment, the first moving blade 132 has a short first stroke, suitable for fine trimming, while the second moving blade 142 has a longer second stroke, suitable for coarse trimming. For example, the shorter stroke of the first moving blade 132 results in a slower movement speed and higher control precision. In motor-driven systems, slower movements are generally easier to control precisely. This is because a slower speed gives the control system more time to respond and adjust to any possible deviations or disturbances. Therefore, the slower movement of the first moving blade 132 allows the control system to more accurately control its position, speed, and acceleration, thereby improving overall control precision. High control precision ensures that the moving blade can precisely trim small areas and details without damaging surrounding hair or skin. Simultaneously, the slower movement speed of the first moving blade 132 makes its movement smoother and less prone to wobbling, contributing to a neat and aesthetically pleasing trim, especially for areas requiring fine trimming, such as beard edges, sideburns, and around the ears. Furthermore, the shorter stroke reduces the contact area and friction between the moving and stationary blades, thereby reducing noise and wear, improving user experience, and extending the blade's lifespan.

[0067] The second moving blade 142 has a longer stroke and faster movement speed, making it suitable for quickly trimming large areas of hair, such as head hair, large areas of beard, or body hair. The longer stroke range allows it to cut more hair in a shorter time, improving trimming efficiency. Coarse trimming requires less precision but demands speed and efficiency; therefore, the second moving blade 142 is designed for quickly processing longer or denser hair, providing a fast and effective trimming result. Although the second moving blade 142 moves quickly, its smaller number allows for better control of its movement trajectory, avoiding violent shaking and noise.

[0068] Furthermore, the first stroke is set between 1.2mm and 2.6mm, and the second stroke between 1.5mm and 2.8mm, effectively cutting hair of various lengths. This satisfies the needs of detailed trimming while also handling longer hairs without compromising the trimming effect. If the stroke is too small, such as below 1.1mm, the blade may not be able to effectively cut longer hairs, requiring more trimming passes and reducing trimming efficiency. If the stroke is too large, such as above 2.9mm, the blade may be difficult to control precisely, especially when trimming detailed areas, potentially resulting in uneven textures.

[0069] The movement frequencies of the first and second moving blades are set between 160Hz and 210Hz, preferably 190Hz. This setting ensures that the blades can reciprocate quickly and stably. If the movement frequency is too low, for example below 160Hz, the reciprocating speed of the blades will be insufficient to handle denser hair areas, potentially leading to incomplete cutting and requiring more trimming cycles. This not only reduces work efficiency but may also exacerbate wear on the blades and skin due to repeated friction. If the movement frequency is too high, it will increase the load on the drive components, leading to increased energy consumption, increased heat generation, and potentially even damage to the drive components.

[0070] In one embodiment, the output power of the first drive unit 110 is less than the output power of the second drive unit 120.

[0071] In this embodiment, if the first driving unit 110 and the second driving unit 120 have the same specifications, their power can be controlled by adjusting the output current of the first driving unit 110 to be less than the output current of the second driving unit 120; alternatively, the output power of the first driving unit 110 can be made less than the output power of the second driving unit 120 by controlling their voltage. If the first driving unit 110 and the second driving unit 120 have different specifications, their power can be controlled by adjusting the resistance of the first driving unit 110 to be greater than the resistance of the second driving unit 120.

[0072] Controlling the stroke by adjusting the output power of the drive unit instead of the voltage reduces system complexity and development costs, while improving production efficiency. For example, if the drive signal of the drive unit is controlled by a software algorithm to adjust the stroke of the moving tool, frequent debugging of software parameters and optimization of the control algorithm are required, increasing the time and cost of software development and debugging. Secondly, adjusting the output power of the drive unit is a direct and easy-to-implement method, making adjustments and settings during the manufacturing process simpler and reducing complexity in production.

[0073] Furthermore, the input current of the first driving unit 110 is less than the input current of the second driving unit 120.

[0074] In this embodiment, the specifications of the first driving unit 110 and the second driving unit 120 are the same. The output power of the first driving unit 110 is controlled to be less than the output power of the second driving unit 120 by controlling the input current of the first driving unit 110.

[0075] Compared to adjusting the voltage to reduce the output power of the first drive unit 110 to be lower than that of the second drive unit 120, this embodiment uses current control to more precisely regulate the output power of the drive components. Especially when the load changes, current control can better maintain a stable power output. For example, when the trimmer is close to the skin, it encounters more hair, especially longer or denser hair, which increases the mechanical resistance of the trimmer. Similarly, when the trimmer's blade contacts the skin, friction increases, increasing the resistance to the blade's movement. Due to the increased mechanical resistance, the motor needs more force to drive the blade. This is usually achieved by increasing the current to generate more electrical energy to overcome the increased load. Because the current control system can quickly detect current changes and adjust the drive signal in a timely manner, it can maintain smooth blade movement and reduce noise. If the output power is adjusted by adjusting the voltage, the voltage control system may not respond promptly when the load suddenly increases, resulting in a momentary voltage drop and unstable output power.

[0076] Meanwhile, current control methods are better able to resist the effects of voltage fluctuations on the system, improving system stability and reliability. In other words, voltage fluctuations may affect the performance of driving components, while current control can provide a more stable output. Furthermore, compared to complex voltage regulation circuits, power regulation by controlling the input current simplifies circuit design and reduces system complexity and cost.

[0077] Furthermore, the hair trimmer 100 also includes a current distributor connected to the power supply of the hair trimmer 100. The current distributor is connected to the input terminal of the first drive unit 110 and the input terminal of the second drive unit 120, respectively. The resistance of the end of the current distributor connected to the first drive unit 110 is greater than the resistance of the end connected to the second drive unit 120.

[0078] In this embodiment, a resistor with resistance R1 is set at one end of the current distributor connected to the first driving unit 110, and a resistor with resistance R2 is set at the other end connected to the second driving unit 120, where R1 > R2. Thus, the current flowing through the current distributor will preferentially flow to the terminal with the smaller resistance, R2, i.e., the second driving unit 120, thereby ensuring that the input current of the first driving unit 110 is less than the input current of the second driving unit 120. By setting different resistance values ​​in the current distributor, current can be passively distributed, precisely ensuring that the input current of the first driving unit 110 is less than the input current of the second driving unit 120. Compared to an active current regulation circuit, this method is simpler and more direct, requiring no complex control circuitry, simplifying circuit design and reducing costs.

[0079] Furthermore, the first drive unit 110 and the second drive unit 120 have the same specifications.

[0080] In this embodiment, "same specifications" means that the rated stroke, performance, and parameters of the first drive unit 110 and the second drive unit 120 are the same, ensuring product consistency. Using drive components of the same specifications simplifies the manufacturing process, reduces production line adjustments and equipment changeover time, and improves production efficiency. Using drive components of the same specifications also enables standardized product design, facilitating the expansion and upgrading of product production lines.

[0081] In one embodiment, please refer to Figure 3 and Figure 4 The first driving unit 110 includes a first coil winding 111, and the second driving unit 120 includes a second coil winding 121. The resistance of the first coil winding 111 is greater than the resistance of the second coil winding 121.

[0082] In this embodiment, the first driving unit 110 and the second driving unit 120 have different specifications. The first coil winding 111 is disposed in the driving component of the first driving unit 110, and the second coil winding 121 is disposed in the driving component of the second driving unit 120. The resistance of the first driving unit 110 is greater than the resistance of the second driving component 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.

[0083] The resistance of the first coil winding 111 can be made greater than that of the second coil winding 121 in the following ways: For example, the first drive unit 110 may include a first magnetic element (not shown in the figure), and the second drive unit 120 may include a second magnetic element (not shown in the figure); the first magnetic element includes a first base plate and two first winding arms protruding from the first base plate, and the first coil winding 111 is wound around the first winding arms; the second magnetic element includes a second base plate and two second winding arms protruding from the second base plate, and the second coil winding 121 is wound around the second winding arms; the number of turns of the first coil winding 111 is greater than the number of turns of the second coil winding 121.

[0084] Alternatively, with the same coil length, the wire diameter of the first coil winding can be smaller than that of the second coil winding; or the resistance of the first coil winding 111 can be made greater than that of the second coil winding 121 by setting the winding tightness of the first coil winding 111 to be greater than that of the second coil winding 121.

[0085] Because the resistance of the first coil winding 111 is greater than that of the second coil winding 121, under the same voltage, the current in the first drive unit 110 is less than that in the second drive unit 120. According to Ohm's law (I = U / R), the larger the resistance, the smaller the current, thus the power output of the first drive unit 110 is lower than that of the second drive unit 120. This setup does not require an additional current distributor; precise control of current and power can be achieved simply through the difference in resistance.

[0086] In one embodiment, the output end of the first drive unit 110 is driven to the first cutter head assembly 130, and the output end of the second drive unit 120 is driven to the second cutter head assembly 140.

[0087] The mass of the first cutter head assembly 130 is greater than the mass of the second cutter head assembly 140, so that in motion, the load resistance of the output shaft of the first drive unit 110 is greater than the load resistance of the output shaft of the second drive unit 120.

[0088] In this embodiment, the first moving blade 132 and the second moving blade 142 have the same mass. Since the number of first moving blades 132 is greater than the number of second moving blades 142, the mass of the first blade assembly 130 is greater than the mass of the second blade assembly 140. This results in the first drive unit 110 experiencing a greater load resistance than the second drive unit 120 during operation, thus making the first stroke shorter than the second stroke. In other words, the larger mass of the first blade assembly 130 means it has greater mechanical resistance, requiring the first drive unit 110 to overcome a greater load resistance during operation. This load resistance mainly includes the inertia of the blade head, frictional resistance, and the shearing resistance of the hair. Within a certain time period, the greater the load resistance, the more limited the movement speed and stroke of the drive component are usually. That is, because the first blade assembly 130 has a larger mass, the first drive unit 110 needs to overcome a larger load resistance, therefore the first stroke is shorter than the second stroke, thereby reducing the total contact area between the multiple first moving blades 132 and the first stationary blade 133, and thus reducing noise.

[0089] In one embodiment, please refer to Figure 3 Each of the first cutter heads 131 has the same stroke, and each of the second cutter heads 141 has the same stroke; at least two of the first cutter heads 131 include a long-bearded cutter head 170 and a short-bearded cutter head 180, and at least one of the second cutter heads 141 includes a short-bearded cutter head 180, with the long-bearded cutter head 170 located between the two short-bearded cutter heads 180.

[0090] In this embodiment, the hair trimmer 100 has three blades: two short-hair blades 180 and one long-hair blade 170. The first blade assembly 130 includes the long-hair blade 170 and the short-hair blade 180, enabling simultaneous processing of both long and short hair. The long-hair blade 170 is located between the two short-hair blades 180, effectively processing the short hair on both sides while trimming the long hair, achieving a more comprehensive trimming effect. The short-hair blades 180 of the second blade assembly 140 are suitable for processing the short hair portion. By applying different types of blades in different areas, the trimmer's efficiency and flexibility can be improved.

[0091] Since the strokes of the individual first cutters 131 in the first cutter head assembly 130 are consistent, it helps to reduce vibration and noise caused by the individual first cutters 131. Similarly, the strokes of the individual second cutters 141 in the second cutter head assembly 140 are consistent, which helps to reduce vibration and noise caused by differences in the strokes of the second cutters 141.

[0092] 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 blades 132, and the second transmission assembly 160 is connected to at least one second moving blade 142. The first transmission assembly 150 is fixedly connected to the output end of the first drive unit 110 to drive the first moving blades 132 to reciprocate in a preset direction. The second transmission assembly 160 is fixedly connected to the output end of the second drive unit 120 to drive the second moving blades 142 to reciprocate in a preset direction. The mass of the first transmission assembly 150 is less than the mass of the second transmission assembly 160.

[0093] In this embodiment, the first transmission component 150 and the second transmission component 160 can be made of the same or different materials. When the materials are different, the first transmission component 150 can be made of a lightweight material, such as plastic or aluminum alloy, while the second transmission component 160 can be made of a heavier material, such as steel or iron. When the materials of the first transmission component 150 and the second transmission component 160 are the same, the counterweight of the second transmission component 160 can be increased to make the mass of the first transmission component 150 less than the mass of the second transmission component 160.

[0094] The first transmission assembly 150 is connected to the first cutter head assembly 130. The first transmission assembly 150 and the first cutter head assembly 130 together constitute the load of the first drive unit 110. The second transmission assembly 160 is connected to the second cutter head assembly 140. The second transmission assembly 160 and the second cutter head assembly 140 together constitute the load of the second drive unit 120. The first cutter head assembly 130 has a larger mass, while the first transmission assembly 150 has a smaller mass, in order to balance the load of the first drive unit 110 and the second drive unit 120, thereby reducing noise. For example, if the load on a single drive component is too heavy, it may generate greater vibration and impact, thus causing noise.

[0095] For details, please refer to Figure 4 , Figure 6 and Figure 7 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 drive 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 drive 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 less than the mass of the second base 161.

[0096] In this embodiment, the first base 151 and the second base 161 can be square, circular, or other shapes. The first transmission rod 152 and the second transmission rod 162 can be elongated cylindrical or elongated cuboid, without limitation. The first transmission rod 152 may include multiple integrally formed connecting rods, or a mounting base including multiple connecting rods may be provided to connect multiple first cutter heads 131. The first base 151 and the second base 161 can be made of the same or different materials. When the materials are different, the first base 151 can be made of a lightweight material, such as plastic or aluminum alloy, while 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 counterweight of the second base 161 can be increased to make the mass of the first base 151 less than the mass of the second base 161. For example, a counterweight block can be added to the second base 161 so that the mass of the second base 161 is greater than that of the first base 151.

[0097] Adjusting the mass of the base allows for more precise control over the mass of the transmission components. Compared to changing other parts, adjusting the mass of the base has a more direct and easily controllable impact on the overall system, simplifying the design and manufacturing process. For example, if the transmission rod in the transmission component is changed, and the transmission rod connects to the cutter head, and if both transmission rods are made of the same material, changing the mass of the transmission rod would require changing its size or adding a counterweight. Both of these methods require consideration of the connection and fit with the cutter head, making the design more complex.

[0098] In one embodiment, the first transmission rod 152 is fitted with a first buffer sleeve, which is connected to the first moving blade 132; the second transmission rod 162 is fitted with a second buffer sleeve, which is connected to the second moving blade 142.

[0099] In this 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 and second buffer sleeves can be made of materials with cushioning effects, such as silicone or rubber. This effectively reduces the vibration generated by the transmission rod during operation. These materials can absorb and buffer the vibration generated by the direct collision between the transmission rod and the moving blade during movement, thereby reducing the propagation of noise.

[0100] In one embodiment, the first moving blade 132 and the second moving blade 142 are arranged side by side, and the first moving blade 132 and the second moving blade 142 move in opposite directions. This causes the vibrations generated by the first moving blade 132 and the second moving blade 142 during movement to cancel each other out, reducing the vibration generated by the equipment during operation and thus reducing noise.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A hair trimmer, characterized in that, It includes a first drive unit, a second drive unit, a first cutter head assembly, and a second cutter head assembly, wherein, The first cutter head assembly includes at least two first cutters; the second cutter head assembly includes at least one second cutter head, and the number of first cutters is greater than the number of second cutters. The first cutter head includes a first moving cutter and a first stationary cutter covering the first moving cutter. The first drive unit is connected to at least two of the first moving cutters to drive the at least two first moving cutters to reciprocate relative to the first stationary cutter in a preset direction at a first speed. The second cutter head includes a second moving cutter and a second stationary cutter covering the second moving cutter. The second drive unit is driven to at least one of the second moving cutters to drive at least one of the second moving cutters to reciprocate relative to the second stationary cutter along the preset direction at a second speed. The first speed is less than the second speed.

2. The hair trimmer as claimed in claim 1, characterized in that, The first speed and the second speed are average speeds.

3. The hair trimmer as claimed in claim 1, characterized in that, The maximum distance of the first moving blade reciprocating relative to the first stationary blade is the first stroke, and the maximum distance of the second moving blade reciprocating relative to the second stationary blade is the second stroke; The first stroke is shorter than the second stroke; The difference in movement frequency between the first moving blade and the second moving blade is less than or equal to 5%.

4. The hair trimmer as claimed in claim 3, characterized in that, The difference in stroke between the first stroke and the second stroke is no greater than 0.8 mm.

5. The hair trimmer as claimed in claim 3, characterized in that, 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 frequencies of the first moving blade and the second moving blade are greater than or equal to 160Hz and less than or equal to 210Hz.

6. The hair trimmer as claimed in claim 1, characterized in that, The output power of the first drive unit is less than the output power of the second drive unit.

7. The hair trimmer as claimed in claim 6, characterized in that, The input current of the first driving unit is less than the input current of the second driving unit.

8. The hair trimmer as claimed in claim 7, characterized in that, The first drive unit and the second drive unit have the same specifications.

9. The hair trimmer as claimed in claim 6, characterized in that, The first driving unit includes a first coil winding, and the second driving unit includes a second coil winding, wherein the resistance of the first coil winding is greater than the resistance of the second coil winding.

10. The hair trimmer as claimed in claim 1, characterized in that, The output end of the first drive unit is driven to the first cutter head assembly, and the output end of the second drive unit is driven 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 drive unit is greater than the load resistance of the output shaft of the second drive unit.

11. The hair trimmer according to any one of claims 1-10, characterized in that, The hair trimmer further includes a first transmission assembly and a second transmission assembly, wherein the first transmission assembly is connected to at least two first moving blades, and the second transmission assembly is connected to at least one second moving blade; The first transmission component is fixedly connected to the output end of the first drive unit to drive the first moving blade to reciprocate along a preset direction; The second transmission component is fixedly connected to the output end of the second drive unit to drive the second moving blade to reciprocate along a preset direction; The mass of the first transmission component is less than the mass of the second transmission component.

12. The hair trimmer as claimed in claim 11, characterized in that, 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 drive unit, and the first transmission rod is connected to 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 drive 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.

13. The hair trimmer as claimed in claim 3, characterized in that, The stroke of each first cutter head is the same, and the stroke of each second cutter head is the same; The first cutter head assembly includes a long-bearded cutter head and a short-bearded cutter head, and the second cutter head assembly includes a short-bearded cutter head, with the long-bearded cutter head located between the two short-bearded cutter heads.

14. The hair trimmer as claimed in claim 1, characterized in that, The first moving blade and the second moving blade are arranged side by side, and the first moving blade and the second moving blade move in opposite directions.

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