Moving cutter and cutter head of hair trimmer and hair trimmer

Abstract

The embodiment of the utility model discloses a moving cutter of a hair trimmer, a cutter head of the hair trimmer and the hair trimmer, and the moving cutter of the hair trimmer comprises an arc-shaped cutting part and two fixing walls; the arc-shaped shearing part comprises a plurality of shearing blades which are arranged at intervals in the preset direction; the two fixing walls are connected to the two side ends of the arc-shaped shearing part in the bending direction of the arc-shaped shearing part and located on the inner side of the outermost end of the arc-shaped shearing part so that a concave space can be formed in the connecting position of the outer side face of each fixing wall and the outer side face of the arc-shaped shearing part. The effective shearing area of the moving cutter of the hair trimmer is large, and the shearing efficiency of the whole hair trimmer is high.

Description

Technical Field

[0001] The present application relates to the technical field of hair trimming, and particularly relates to a moving blade of a hair trimmer, a cutter head of a hair trimmer, and a hair trimmer. Background Art

[0002] Common hair trimmers include razors, hair clippers, hair groomers, etc. A hair trimmer includes a moving blade and a stationary blade that are fitted to each other, and the moving blade is driven to move relative to the stationary blade through a driving mechanism to cut hair. In order to better fit the skin, currently there are hair trimmers with the cross-sections of the stationary blade and the moving blade being U-shaped. Limited by the stationary blade, the effective cutting area of the moving blade with a U-shaped cross-section is small, resulting in low cutting efficiency of the whole machine.

[0003] The above content is only used to assist in understanding the technical solution of the utility model, and does not represent an admission that the above content is prior art. Summary of the Utility Model

[0004] In view of the above problems, the present utility model provides a moving blade of a hair trimmer, aiming to solve the technical problem of the small effective cutting area of the moving blade.

[0005] To achieve the above object, the moving blade of the hair trimmer provided by the present utility model includes an arc-shaped cutting portion and two fixed walls;

[0006] The arc-shaped cutting portion includes a plurality of cutting edges arranged at intervals along a preset direction;

[0007] The two fixed walls are connected to both ends of the arc-shaped cutting portion on both sides in its bending direction, and are located inside the outermost ends of the arc-shaped cutting portion, so that a recessed space is formed at the connection between the outer side surface of each fixed wall and the outer side surface of the arc-shaped cutting portion.

[0008] In one embodiment, the two fixed walls are respectively connected to the arc-shaped cutting portion through a connecting portion; the connecting portion is arranged at an angle with both the first direction and the second direction, and the outer side surface of the connecting portion is inclined outward; the two fixed walls are spaced apart in the first direction, and the first direction, the second direction, and the preset direction are perpendicular to each other in pairs.

[0009] In one embodiment, the outer side surface of the connecting portion is an arc surface, and the outer side surface of the connecting portion is smoothly transitioned with the outer side surface of the arc-shaped cutting portion and the outer side surface of the fixed wall.

[0010] In one embodiment, the inner side surface of the connecting portion is arc-shapedly transitioned with the inner side surface of the arc-shaped cutting portion and encloses a feeding space.

[0011] In one embodiment, the outer side surface of the arc-shaped cutting portion is arc-shapedly transitionally connected to the outer side surface of the fixed wall.

[0012] In one embodiment, the arc-shaped shearing part, the connecting part and the two fixed walls are integrally formed.

[0013] In one embodiment, in the bending direction of the arc-shaped shearing part, both ends of the shearing blade extend to the connecting part.

[0014] In one embodiment, in the bending direction of the arc-shaped shearing part, the width of the shearing blade gradually increases from the middle to both ends.

[0015] In one embodiment, the ratio of the distance between the two fixed walls to the maximum width of the arc-shaped shearing part in its bending direction is greater than or equal to 0.6 and less than or equal to 0.9.

[0016] The present utility model also provides a cutter head of a hair trimmer, including a stationary blade, a moving knife holder and a moving knife of the hair trimmer according to any one of the above embodiments. The stationary blade covers the periphery of the arc-shaped shearing part of the moving knife to cooperate with the arc-shaped shearing part to shear hair; the two fixed walls of the moving knife are fixedly connected to the moving knife holder.

[0017] The present utility model also provides a hair trimmer, including a main body and at least one cutter head of the hair trimmer as described above. The main body has an output shaft, and the output shaft is connected to the moving knife of the cutter head of the hair trimmer to drive the moving knife to reciprocate relative to the stationary blade along a preset direction.

[0018] The moving knife of the hair trimmer of the present utility model is configured such that the two fixed walls are connected to both side ends of the arc-shaped shearing part in its bending direction and are located inside the outermost ends of the arc-shaped shearing part, so that a concave space is formed at the connection between the outer side surface of each fixed wall and the outer side surface of the arc-shaped shearing part. Thus, compared with a moving knife having a U-shaped cross section, without increasing the distance between the two fixed walls, the extension length of the arc-shaped shearing part in its bending direction can be effectively increased, so that the shearing blade on the arc-shaped shearing part can be set longer, thereby increasing the effective shearing area of the moving knife, and further improving the shearing efficiency of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 FIG. shows a schematic structural diagram of one embodiment of the moving knife of the hair trimmer of the present utility model;

[0021] Figure 2 is Figure 1 the left view of the moving blade of the hair trimmer in

[0022] Figure 3 is Figure 1 the cross-sectional view of the moving blade of the hair trimmer at an angle in

[0023] Figure 4 is the cross-sectional view of an embodiment of the cutter head of the hair trimmer of the present utility model, wherein the dotted part indicates the existing moving blade with a U-shaped cross-section;

[0024] Figure 5 is Figure 4 the schematic structural view of the cutter head of the hair trimmer in , wherein the stationary blade is removed;

[0025] Figure 6 is Figure 5 the exploded view of the cutter head of the hair trimmer in ;

[0026] Figure 7 is the schematic structural view of an embodiment of the hair trimmer of the present utility model;

[0027] Figure 8 is Figure 7 the schematic structural view of the cutter head of the hair trimmer in ;

[0028] Figure 9 is Figure 8 the cross-sectional view of the cutter head of the hair trimmer at an angle in .

[0029] Explanation of the reference numerals in the drawings:

[0030] Label Name Label Name Label Name 10 Blade head of hair clipper 120 Fixed wall 200 Stationary blade 100 Moving blade of hair clipper 130 Connecting part 300 Moving blade seat 110 Arc-shaped shearing part 140 Recessed space 20 Main body 111 Shearing edge 150 Advancing space

[0031] The realization, functional features and advantages of the object of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of the technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of the technical solutions does not exist and is not within the protection scope required by the present utility model.

[0033] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously.

[0035] The present utility model provides a moving blade for a hair trimmer, which is used for the cutter head of the hair trimmer and cooperates with a stationary blade to cut hair.

[0036] In the embodiments of the present utility model, please refer to Figures 1 to 4 , the moving blade 100 of the hair trimmer includes an arc-shaped shearing portion 110 and two fixing walls 120; the arc-shaped shearing portion 110 includes a plurality of shearing edges arranged at intervals along a preset direction; the two fixing walls 120 are connected to both ends of the arc-shaped shearing portion 110 in its bending direction and are located inside the outermost ends of the arc-shaped shearing portion 110, so that a recessed space 140 is formed at the connection of the outer side surface of each fixing wall 120 and the outer side surface of the arc-shaped shearing portion 110.

[0037] In this embodiment, it can be understood that the extending shape of the cross-section of the arc-shaped shearing portion 110 is arc-shaped. The central angle corresponding to the cross-section of the arc-shaped shearing portion 110 can be less than 180 degrees, or equal to or greater than 180 degrees, as long as the cross-section of the arc-shaped shearing portion 110 is arc-shaped. The central angle corresponding to the cross-section of the arc-shaped shearing portion 110 is not specifically limited herein. A plurality of shearing edges are provided on the arc-shaped shearing portion 110 for cooperating with the mesh holes on the stationary blade 200 to achieve shearing. The specific structure of the shearing edges can refer to the existing design and is not specifically limited herein. The fixing walls 120 are used to fix the moving blade 100 to the moving blade seat 300 or other structures.

[0038] It can be understood that the arc-shaped shearing portion 110 has two outermost end points in its bending direction, referring to the two outermost points of the projection plane of the arc-shaped shearing portion 110 on the horizontal plane in the opposite directions of the two fixed walls 120. Thus, when the central angle corresponding to the cross-section of the arc-shaped shearing portion 110 is less than or equal to 180 degrees, the two outermost end points of the arc-shaped shearing portion 110 in its bending direction are the two end end points of the arc-shaped shearing portion 110 in the bending direction. When the central angle corresponding to the cross-section of the arc-shaped shearing portion 110 is greater than 180 degrees, the two outermost end points of the arc-shaped shearing portion 110 in the bending direction are located outside the two end end points of the arc-shaped shearing portion 110 in the bending direction. By connecting the two fixed walls 120 to the inner side of the outermost end of the arc-shaped shearing portion 110 in the bending direction, a recessed space 140 can be formed at the connection between the outer side surface of the fixed wall 120 and the outer side surface of the arc-shaped shearing portion 110.

[0039] Figure 4 The figure shows a cross-sectional view of an embodiment of the cutter head 10 of the hair trimmer of the present utility model. Among them, the dotted part indicates the existing moving cutter 100 with a U-shaped cross-section. From Figure 4 It can be seen that the fixed wall 120 of the moving cutter 100 is used to be fixed to the moving cutter seat 300, and the arc-shaped shearing portion 110 of the moving cutter 100 is used to be fitted with the stationary cutter 200. If the two ends of the arc-shaped shearing portion 110 of the existing moving cutter 100 with a U-shaped cross-section extend downward in the bending direction, the distance between the two fixed walls 120 will increase. Thus, the gap between the fixed wall 120 and the stationary cutter 200 seat will decrease, making it easy for the moving cutter 100 to interfere and rub during movement.

[0040] The moving cutter 100 of the hair trimmer of the present utility model is configured such that the two fixed walls 120 are connected to the two side ends of the arc-shaped shearing portion 110 in its bending direction and are located inside the outermost end of the arc-shaped shearing portion 110, so that a recessed space 140 is formed at the connection between the outer side surface of each fixed wall 120 and the outer side surface of the arc-shaped shearing portion 110. Thus, compared with the moving cutter 100 with a U-shaped cross-section, the extension length of the arc-shaped shearing portion 110 in its bending direction can be effectively increased without increasing the distance between the two fixed walls 120, so that the shearing edge on the arc-shaped shearing portion 110 can be set longer, thereby increasing the effective shearing area of the moving cutter 100 and further improving the shearing efficiency of the whole machine.

[0041] In this application, the outer side surface of the arc-shaped shearing portion 110 and the outer side surface of the fixed wall 120 can be transitioned by an arc surface, a bevel surface, or a combination of an arc surface and a bevel surface.

[0042] In one embodiment, the outer side surface of the arc-shaped shearing portion 110 is arc-transitionally connected to the outer side surface of the fixed wall 120. Compared with the bevel transition between the arc-shaped shearing portion 110 and the fixed wall 120, the arc-transition between the outer side surface of the arc-shaped shearing portion 110 and the outer side surface of the fixed wall 120 can effectively avoid stress concentration and prevent the connection from breaking, thereby improving the service life of the moving blade 100. In addition, the arc-transition between the outer side surface of the arc-shaped shearing portion 110 and the outer side surface of the fixed wall 120 makes there be no dead corners on the outside of the moving blade 110 that are easy to hide hair debris, making it easy to clean the power 100.

[0043] In one embodiment, as Figures 2 to 5 shown, the two fixed walls 120 are respectively connected to the arc-shaped shearing portion 110 through a connecting portion 130; the connecting portion 130 is arranged at an angle with both the first direction and the second direction, and the outer side surface of the connecting portion 130 is inclined outward; the two fixed walls 120 are arranged at intervals in the first direction, and the first direction, the second direction and the preset direction are perpendicular to each other in pairs. That is, in the direction from the arc-shaped shearing portion 110 to the two fixed walls 120, the interval between the two connecting portions 130 gradually decreases.

[0044] In this embodiment, it can be understood that the surface of the arc-shaped shearing portion 110 is an arc surface, while the surface of the fixed wall 120 is generally set as a plane. If the arc-shaped shearing portion 110 is directly connected to the fixed wall 120, it will cause the connection to be easily broken. By providing the connecting portion 130 to connect the fixed wall 120 and the arc-shaped shearing portion 110, the connecting portion 130 is bent relative to the arc-shaped shearing portion 110 and the fixed wall 120, which can form a concave space 140 at the connection between the outer side surface of the fixed wall 120 and the outer side surface of the arc-shaped shearing portion 110, and can effectively avoid the connection between the fixed wall 120 and the arc-shaped shearing portion 110 from being easily broken directly.

[0045] The connecting portion 130 is arranged at an angle with both the first direction and the second direction, and the outer side surface of the connecting portion 130 is inclined outward, that is, the outer side surface of the connecting portion 130 forms an obtuse angle with the outer side surface of the fixed wall 120. Compared with the connecting portion 130 being arranged at a right angle to the fixed wall 120, or the outer side surface of the connecting portion 130 forming an acute angle with the outer side surface of the fixed wall 120, it can effectively avoid the connection between the connecting portion 130 and the fixed wall 120 from breaking, improve the structural strength, and thus ensure the service life of the moving blade 100.

[0046] To ensure the structural strength, optionally, the arc-shaped shearing portion 110, the connecting portion 130 and the two fixed walls 120 are integrally formed. In actual production, the fixed wall 120 of the moving blade 100 with a U-shaped cross-section can be integrally offset inward relative to the arc-shaped shearing portion 110 to naturally bend to form the connecting portion 130.

[0047] In the present application, the outer side surface of the connecting portion 130 may be a curved surface, an inclined surface, or a combination of a curved surface and an inclined surface.

[0048] Further, if Figures 2 to 4 As shown, the outer side surface of the connecting portion 130 is an arcuate surface, and the outer side surface of the connecting portion 130 smoothly transitions with the outer side surface of the arcuate shearing portion 110 and the outer side surface of the fixed wall 120. In this way, the outer peripheral wall of the arcuate shearing portion 110 and the fixed wall 120 are smoothly connected through the arcuate connecting portion 130, effectively preventing the arcuate shearing portion 110, the connecting portion 130, and the fixed wall 120 from breaking.

[0049] In one embodiment, please refer to Figures 1 to 3 The inner side surface of the connecting portion 130 transitions with the inner side surface of the curved shearing portion 110 in an arcuate manner, enclosing a space for entry 150. This arcuate transition between the inner and outer sides of the connecting portion 130 and the curved shearing portion 110 further ensures the connection strength between the connecting portion 130, the curved shearing portion 110, and the fixed wall 120, thereby ensuring the service life of the movable blade 100. Furthermore, the inner side surface of the connecting portion 130 and the inner side surface of the curved shearing portion 110 enclose the space for entry 150. This allows the inner side surface of the connecting portion 130 to receive some hair, thereby enhancing the hair-cutting effect of the shearing edge of the curved shearing portion 110 adjacent to the connecting portion 130. Furthermore, the arcuate transition between the inner side surface of the connecting portion 130 and the inner side surface of the curved shearing portion 110 eliminates dead corners on the inner side of the movable blade 110 where stubble and other debris can easily hide, making the power tool 100 easier to clean.

[0050] In one embodiment, if Figure 1 、 Figure 5 、 Figure 6 As shown, in the bending direction of the arc-shaped cutting portion 110, both ends of the cutting blade extend to the connecting portion 130. In this way, the length of the cutting blade can be maximized, the effective cutting area of the arc-shaped cutting portion 110 can be increased, and the cutting efficiency of the entire hair trimmer can be improved.

[0051] In one embodiment, please refer again to Figure 1 、 Figure 5 、 Figure 6 In the curvature of the arcuate shearing portion 110, the width of the shearing blade gradually increases from the middle to the ends. The larger width of the shearing blade at the ends of the curvature improves the connection strength with the fixed wall 120 and prevents breakage. The smaller width of the shearing blade in the middle of the curvature allows the shearing blade to fit more closely with the movable blade 100, thereby improving the shearing effect of the cutter head 10.

[0052] In one embodiment, the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in its bending direction is greater than or equal to 0.6 and less than or equal to 0.9. Specifically, the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in its bending direction can be 0.6, 0.65, 0.7, 0.78, 0.8, 0.85, 0.88, 0.9.

[0053] When the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in its bending direction is less than 0.6, the inner bending distance of the two fixed walls 120 relative to the arc-shaped shearing part 110 is too large, the size of the entire arc-shaped shearing part 110 in the bending direction is too large, and the arc-shaped shearing part 110 is prone to shaking relative to the fixed walls 120, thereby affecting the cutting effect. When the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in its bending direction is greater than 0.9, the inner bending distance of the two fixed walls 120 relative to the arc-shaped shearing part 110 is too small, and the effect of increasing the effective shearing area of the moving blade 100 is not obvious. By making the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in its bending direction greater than or equal to 0.6 and less than or equal to 0.9, while ensuring the running stability of the entire moving blade 100, the effective shearing area of the moving blade 100 can be significantly increased, realizing an overall improvement in the shearing efficiency of the hair clipper.

[0054] The present invention also proposes a cutter head 10 of a hair trimmer, as Figures 4 to 6 , Figure 9 shown. The cutter head 10 of the hair trimmer includes a stationary blade 200, a moving blade seat 300, and a moving blade 100 of the hair trimmer. The stationary blade 200 covers the periphery of the arc-shaped shearing part 110 of the moving blade 100 to cooperate with the arc-shaped shearing part 110 to shear hair; the two fixed walls 120 of the moving blade 100 are fixedly connected to the moving blade seat 300; the specific structure of the moving blade 100 of the hair trimmer refers to the above embodiment. Since the cutter head 10 of the hair trimmer adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0055] The cross-section of the stationary blade 200 is U-shaped, and the arc-shaped shearing part 110 of the moving blade 100 fits with the arc-shaped inner surface of the stationary blade 200 so that the moving blade 100 moves relative to the stationary blade 200 to shear hair. The specific structure of the moving blade seat 300 can be various, as long as it can fix the fixed walls 120 of the moving blade 100 and the output shaft, and no specific limitation is made here. The fixed walls 120 and the moving blade seat 300 can be fixedly connected by welding.

[0056] The present invention also proposes a hair trimmer. Please refer toFigure 7 and Figure 8 , the hair trimmer includes a main body 20 and at least one cutter head 10 of the hair trimmer. The main body 20 has an output shaft, and the output shaft is connected to a moving blade 100 of the cutter head 10 of the hair trimmer to drive the moving blade 100 to reciprocate relative to a stationary blade 200 along a preset direction; for the specific structure of the cutter head 10 of the hair trimmer, refer to the above-mentioned embodiments. Since this hair trimmer adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated one by one here.

[0057] The hair trimmer may include one or more of the above-mentioned cutter heads 10. A driving mechanism is provided in the main body 20, and an output shaft of the driving mechanism is connected to the moving blade 100 to drive the moving blade 100 to reciprocate relative to the stationary blade 200 along a preset direction to cut hair. The specific structures of the main body 20 and the driving mechanism may have many forms and are not specifically limited here.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. The moving blade of a hair trimmer, characterized in that, It includes an arc-shaped shearing part and two fixed walls; The arc-shaped shearing part includes a plurality of shearing blades arranged at intervals in a preset direction; The two fixed walls are connected to both ends of the arc-shaped shearing part on both sides in its bending direction and are located inside the outermost ends of the arc-shaped shearing part, so that a recessed space is formed at the connection between the outer side surface of each fixed wall and the outer side surface of the arc-shaped shearing part.

2. The moving blade of the hair trimmer according to claim 1, characterized in that, The two fixed walls are respectively connected to the arc-shaped shearing part through a connecting part; the connecting part is arranged at an angle with both the first direction and the second direction, and the outer side surface of the connecting part is inclined outward; the two fixed walls are arranged at intervals in the first direction, and the first direction, the second direction and the preset direction are perpendicular to each other in pairs.

3. The moving blade of the hair trimmer according to claim 2, wherein The outer side surface of the connecting part is an arc surface, and the outer side surface of the connecting part is smoothly transitioned with the outer side surface of the arc-shaped shearing part and the outer side surface of the fixed wall.

4. The moving blade of the hair trimmer according to claim 2, wherein The inner side surface of the connecting part is arc-shapedly transitioned with the inner side surface of the arc-shaped shearing part and encloses to form an inlet space.

5. The moving blade of the hair trimmer according to claim 1, characterized in that, The outer side surface of the arc-shaped shearing part is arc-shapedly transitionally connected to the outer side surface of the fixed wall.

6. The moving blade of the hair trimmer according to claim 2, characterized in that The arc-shaped shearing part, the connecting part and the two fixed walls are integrally formed.

7. The moving blade of the hair trimmer according to claim 2, wherein In the bending direction of the arc-shaped shearing part, both ends of the shearing blade extend to the connecting part.

8. The moving blade of the hair trimmer according to claim 1, wherein In the bending direction of the arc-shaped shearing part, the width of the shearing blade is gradually increased from the middle to both ends.

9. The moving blade of the hair trimmer according to any one of claims 1 to 8, characterized in that, The ratio of the distance between the two fixed walls to the maximum width of the arc-shaped shearing part in its bending direction is greater than or equal to 0.6 and less than or equal to 0.

9.

10. A cutter head of a hair trimmer, characterized in that, It includes a stationary blade, a movable blade seat and a movable blade of the hair trimmer according to any one of claims 1 to 9. The stationary blade covers the periphery of the arc-shaped shearing part of the movable blade to cooperate with the arc-shaped shearing part to shear hair; the two fixed walls of the movable blade are fixedly connected to the movable blade seat.

11. A hair trimmer, characterized in that, It includes a main body and at least one cutter head of the hair trimmer according to claim 10. The main body has an output shaft, and the output shaft is connected to the movable blade of the cutter head of the hair trimmer to drive the movable blade to reciprocate relative to the stationary blade in a preset direction.

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