Blade set and manufacturing method therefor, and hair cutting appliance

Abstract

A blade set and a manufacturing method therefor, and a hair cutting appliance. A fixed cutter base (1) of a blade set (100) is formed by means of symmetrically folding two side wings (12) of a rectangular metal sheet (11), and a mounting slot (14) is provided in the side of the fixed cutter base (1) facing the side wings (12); comb-shaped teeth (15) are provided at bending positions on two sides of the fixed cutter base (1); a fixed blade (2) is arranged on the fixed cutter base (1) and covers the mounting slot (14), and fixed cutter teeth (21) on two sides of the fixed blade (2) are arranged corresponding to the comb-shaped teeth (15) on a one-to-one basis; and a movable blade (31) is movably mounted in the mounting slot (14) and is located between the fixed cutter base (1) and the fixed blade (2), and movable cutter teeth (311) on two sides of the movable blade (31) are exposed at tooth intervals of the comb-shaped teeth (15). The fixed cutter base (1) and the fixed blade (2) both use a metal structure. The manufacturing method for the blade set (100) is mainly used for manufacturing the fixed cutter base (1). The hair cutting appliance comprises the blade set (100).

Description

Blade assembly and its manufacturing method, hair cutting tool Technical Field

[0001] This invention belongs to the field of cutting tool technology, and relates to hair cutting products, particularly to a blade assembly and its manufacturing method, and a hair cutting instrument. Background Technology

[0002] Current hair removal products cannot shave both long and short hairs (less than 0.1mm) cleanly in one go. The usual practice is to first use a side shaving blade (or sideburn shaving blade) to shorten the long hairs, and then use a foil shaving blade to clean the short hairs. The main reason is that the structure of the side shaving blade means that its thickness cannot be too thin. If it is too thin, it will not be strong and will become too sharp, easily cutting the skin. The foil shaves the short hairs cleanly, but because it does not have comb teeth, it cannot cut long hairs. Therefore, the side shaving blade and the foil shaving blade are always used together.

[0003] However, some products known to the inventors have not yet reached their optimal state. For example, Philips' blade assembly (i.e., the blade head) often uses a combination of plastic and metal in its fixed blade assembly. That is, the fixed blade holder is made of plastic and the fixed blade is made of metal. This not only makes the assembly process complex and involves many parts, but also makes the plastic blade holder prone to breakage when it falls, resulting in poor durability and reduced blade head lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a novel blade assembly and its manufacturing method, as well as a hair cutting tool. Both the fixed blade holder and the fixed blade of the blade assembly are made of metal, which can improve the structural strength and durability of the blade assembly, thereby solving the problems of the plastic fixed blade holder being easily damaged by falling off, having poor durability, and reducing the service life of the blade head in the existing blade assemblies.

[0005] To achieve the above objectives, the present invention provides a blade assembly for a hair cutting tool, comprising a fixed blade assembly and a movable blade assembly. The fixed blade assembly includes a fixed blade holder and a fixed blade. The fixed blade holder is formed by symmetrically folding two wings of a rectangular metal sheet. The outer edges of the two wings are joined together, and a guide groove is provided at the joint of the two wings. A mounting groove for mounting the movable blade is provided on the side of the fixed blade holder opposite to the wings. Comb-like teeth are provided at the bent positions on both sides of the fixed blade holder. The fixed blade is disposed on the fixed blade holder and covers the mounting groove. Fixed blade teeth are provided on both sides of the fixed blade, and the fixed blade teeth are arranged in a one-to-one correspondence with the comb-like teeth. The movable blade assembly includes a movable blade, which is movably mounted in the mounting groove and located between the fixed blade holder and the fixed blade. Movable blade teeth are provided on both sides of the movable blade, and the movable blade teeth are exposed at the tooth spacing of the comb-like teeth.

[0006] In some embodiments, the mounting groove is a rectangular groove and is located at the center of the rectangular metal sheet.

[0007] In some embodiments, notches are provided on the outer edges of both sides of the rectangular metal sheet, and the notches of the two sides are joined together to form the guide groove.

[0008] In some embodiments, the fixed blade holder has an embedding groove on one side where the mounting groove is located, and the fixed blade is embedded and fixed in the embedding groove; or, the fixed blade is formed by symmetrically folding two wings of a rectangular metal sheet, the fixed blade is wrapped around the outside of the fixed blade holder, and the fixed blade teeth are provided at both bent positions on both sides of the fixed blade.

[0009] In some embodiments, the fixed blade holder has a convex curved surface on one side of the mounting groove, and the fixed blade is an integral convex blade adapted to the convex curved surface.

[0010] In some embodiments, protective end caps are inserted into the exterior of both ends of the fixed tool holder to provide safety protection for both ends of the fixed tool holder; or, the edges of both ends of the fixed tool holder are folded outwards with flanges, which can blunt the edges of both ends of the fixed tool holder to provide safety protection for both ends of the fixed tool holder; or, metal strips are provided on the outer surface of both ends of the fixed tool holder, which can increase the thickness of the edges of both ends of the fixed tool holder to provide safety protection for both ends of the fixed tool holder.

[0011] In some embodiments, a fixed tool holder is also provided on one side of the guide groove of the fixed tool holder, and fixed ears are provided at both ends of the fixed tool holder, with mounting holes provided on any one of the fixed ears.

[0012] In some embodiments, two sets of cantilever arms are symmetrically arranged on the moving blade, and the moving blade set further includes a moving blade support and a transmission component; the moving blade support is located inside the fixed blade holder, and both top ends of the moving blade support pass through the fixed blade holder and the guide groove in sequence, and the two top ends of the moving blade support are respectively connected to the two sets of cantilever arms; two insert fingers are symmetrically arranged at the bottom of the moving blade support, and a slot is provided on the inner side of any one of the insert fingers; a "U"-shaped slot is provided on the transmission component, and the two insert fingers are engaged with the "U"-shaped slot through the slot.

[0013] The present invention also proposes a method for preparing the blade assembly described in any one of the above claims, including the preparation step of the fixed blade holder. The preparation step of the fixed blade holder includes: firstly folding the two sides of a rectangular metal sheet symmetrically to form the fixed blade holder, and then inserting protective end caps on the outside of both ends of the fixed blade holder; or, firstly folding the two ends of the rectangular metal sheet outward to form flanges, and then folding the two sides of the rectangular metal sheet with the flanges symmetrically to form the fixed blade holder; or, firstly setting metal strips on the outer surfaces of the two ends of the rectangular metal sheet, and then folding the two sides of the rectangular metal sheet with the metal strips symmetrically to form the fixed blade holder.

[0014] The present invention also proposes a hair cutting tool, comprising the blade assembly described in any one of the above claims.

[0015] Compared with the prior art, the present invention achieves the following technical advantages: The blade assembly proposed in this invention has a reasonable structural design. The fixed blade holder is formed by symmetrically folding two wings of a rectangular metal sheet. Both the fixed blade holder and the fixed blade are made of metal, which can improve the structural strength and durability of the blade assembly. This solves the problems of existing blade assemblies, such as the plastic fixed blade holder being easily damaged by falling, poor durability, and short service life. Moreover, since both the fixed blade holder and the fixed blade are made of metal, the entire fixed blade assembly is made of metal, which has a better texture compared to plastic blade holders.

[0016] In some of the technical solutions disclosed in this invention, protective end caps, metal strips or flanges are also provided at both ends of the fixed blade holder for safety protection, which can prevent the ends of the fixed blade holder from being too sharp and causing damage to the human body or other objects, thereby improving the safety of the entire blade assembly during assembly, installation and use.

[0017] The manufacturing method of the blade assembly provided by this invention is mainly used to manufacture the fixed blade holder. By setting protective end caps, metal strips or flanges at both ends of the fixed blade holder for safety protection, it can prevent the ends of the fixed blade holder from being too sharp and causing damage to the human body or other objects, which is beneficial to improving the safety of the entire blade assembly during assembly, installation and use.

[0018] The hair cutting tool provided by the present invention includes the above-mentioned blade assembly and has all the characteristics of the above-mentioned blade assembly, which will not be described in detail here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is an overall structural diagram of a blade assembly disclosed according to one or more embodiments.

[0021] Figure 2 is a top view of a blade assembly disclosed according to one or more embodiments.

[0022] Figure 3 is a cross-sectional view of Figure 2 (AA section).

[0023] Figure 4 is an exploded structural diagram of a blade assembly disclosed according to one or more embodiments.

[0024] Figure 5 is a schematic diagram of a first assembly of a fixed blade and a fixed blade holder in a blade assembly disclosed according to one or more embodiments.

[0025] Figure 6 is a schematic diagram of the moving blade assembly in a blade assembly disclosed according to one or more embodiments.

[0026] Figure 7 is a schematic diagram of a second assembly of a fixed blade and a fixed blade holder in a blade assembly disclosed according to one or more embodiments.

[0027] Figure 8 is an enlarged structural diagram of point B in Figure 7.

[0028] Figure 9 is an enlarged structural diagram of point C in Figure 7.

[0029] Figure 10 is a schematic diagram of the structure and forming principle of the fixed tool holder in a blade assembly disclosed according to one or more embodiments.

[0030] Figure 11 is a schematic diagram of the structure and forming principle of the fixed tool holder in a blade assembly disclosed according to one or more embodiments.

[0031] Figure 12 is a schematic diagram of the structure and forming principle of the fixed tool holder in a blade assembly disclosed according to one or more embodiments.

[0032] In the figure, the reference numerals are as follows: 100, blade assembly; 1, fixed blade holder; 11, rectangular metal sheet; 12, side wing; 13, guide groove; 14, mounting groove; 15, comb-like teeth; 16, notch; 17, embedding groove; 18, convex curved surface; 19, protective end cap; 110, flange; 111, metal strip; 112, fixed blade holder; 113, fixing ear; 114, mounting hole; 2, fixed blade; 21, fixed blade teeth; 3, moving blade assembly; 31, moving blade; 311, moving blade teeth; 312, cantilever; 32, moving blade support; 321, mating surface; 33, insert finger; 331, slot; 4, transmission component; 41, "U" shaped slot; 5, fixed blade assembly. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] One of the objectives of this invention is to provide a novel blade assembly in which both the fixed blade holder and the fixed blade are made of metal, which can improve the structural strength and durability of the blade assembly and solve the problems of the plastic fixed blade holder being easily damaged by falling off, having poor durability, and reducing the service life of the blade head.

[0035] Another object of the present invention is to provide a method for manufacturing the above-mentioned blade assembly.

[0036] Another object of the present invention is to provide a hair cutting device comprising the above-described blade assembly.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] As shown in Figures 1 to 4, this embodiment proposes a blade assembly 100 for use on a hair cutting tool. The blade assembly 100 specifically includes a fixed blade assembly 5 and a moving blade assembly 3. The fixed blade assembly 5 includes a fixed blade seat 1 and a fixed blade 2. The fixed blade seat 1 is formed by symmetrically folding two wings 12 from a rectangular metal sheet 11. The outer edges of the two wings 12 are joined together, and a guide groove 13 for guiding the moving blade 31 is provided at the joint of the two wings 12. On the side of the fixed blade seat 1 opposite to the side wings 12, a mounting groove 14 for mounting the moving blade 31 is provided. Comb-like teeth 15 are provided at the bending positions on both sides of the fixed blade seat 1. The fixed blade 2 is disposed on the fixed blade seat 1 and covers the mounting groove 14. After the fixed blade 2 and the fixed blade seat 1 are assembled, one side of the mounting groove 14 is the fixed blade 2, and the other side is the two side wings 12. The space between the two side wings 12 and the fixed blade 2 is the space for mounting the moving blade 31. Both sides of the fixed blade 2 are provided with fixed blade teeth 21, which are arranged one-to-one with the comb-shaped teeth 15. The moving blade assembly 3 includes a moving blade 31, which is movably installed in the mounting groove 14 and located between the fixed blade holder 1 and the fixed blade 2. Both sides of the moving blade 31 are provided with serrated moving blade teeth 311, which are exposed at the tooth gaps of the comb-shaped teeth 15. In use, the moving blade teeth 311 cooperate with the fixed blade teeth 21 to achieve the cutting function. In the above-mentioned blade assembly 100, the fixed blade holder 1 is formed by symmetrically folding the two side wings 12 of a rectangular metal sheet 11. Both the fixed blade holder 1 and the fixed blade 2 are made of metal, which can improve the structural strength and durability of the blade assembly 100 and solve the problems of easy breakage, poor durability and short service life of existing plastic fixed blade holders. Moreover, the fixed blade holder 1 and the fixed blade 2 are both made of metal, making the fixed blade assembly 5 as a whole metal, which has a better texture than plastic blade holders.

[0040] In some embodiments, the mounting groove 14 is preferably a rectangular groove and is located at the center of the rectangular metal sheet 11. The fixed tool holder 1 formed by folding the rectangular metal sheet 11 is rectangular in shape, and the rectangular center of the fixed tool holder 1 and the mounting groove 14 coincide.

[0041] In some embodiments, it is preferred that the outer edges of both sides of the rectangular metal sheet 11 have notches 16, which are preferably rectangular. After the outer edges of the two sides of the wings 12 are joined together, the notches 16 of the two sides of the wings 12 are joined together to form a guide groove 13. The guide groove 13 is rectangular in shape, and the length directions of the guide groove 13, the fixed tool holder 1, and the mounting groove 14 are all parallel. The rectangular centers of the guide groove 13, the fixed tool holder 1, and the mounting groove 14 coincide. It should be noted that since the outer edges of both sides of the rectangular metal sheet 11 have notches 16, when the rectangular metal sheet 11 is in a completely flat state, it has an "I"-shaped structure with a hollow center (i.e., the mounting groove 14).

[0042] In some embodiments, the fixed blade 2 is preferably formed by symmetrically folding two wings of a rectangular metal sheet, as shown in Figure 5. The fixed blade 2 is wrapped around the outside of the fixed blade holder 1, and fixed blade teeth 21 are provided at both bent positions of the fixed blade 2. During assembly, for reinforcement, the fixed blade 2 is preferably welded to the fixed blade holder 1.

[0043] In some embodiments, one side of the mounting groove 14 of the fixed tool holder 1 can be a flat surface or a convex curved surface 18, and the overall shape of the fixed blade 2 is adapted to the shape of one side of the mounting groove 14 of the fixed tool holder 1. If one side of the mounting groove 14 of the fixed tool holder 1 is a convex curved surface 18, then the fixed blade 2 is set as a convex blade adapted to the convex curved surface 18; correspondingly, the moving blade 31 is also a convex blade adapted to the convex curved surface 18.

[0044] In some embodiments, as shown in Figures 1, 3 and 4, a fixed tool holder 112 is also provided on one side of the guide groove 13 of the fixed tool holder 1. Fixed ears 113 are provided at both ends of the fixed tool holder 112, and mounting holes 114 are provided on any fixed ear 113.

[0045] In some embodiments, as shown in Figures 1, 4, and 6, two sets of cantilever arms 312 are symmetrically arranged on the moving blade 31. As shown in Figure 6, two U-shaped grooves are symmetrically formed on the moving blade 31, and the inner circle of the U-shaped grooves is the cantilever arm 312.

[0046] In some embodiments, as shown in Figures 1, 4, and 6, the moving tool assembly 3 further includes a moving tool support 32 and a transmission component 4. The moving tool support 32 is located between the two fixed ears 113 of the fixed tool holder 112. The moving tool support 32 is generally U-shaped, with its two top ends passing through the fixed tool holder 112 and the guide groove 13 in sequence. Each of the two top ends of the moving tool support 32 has a contact surface 321, and the two top ends of the moving tool support 32 are connected to the two sets of cantilever arms 312 through the contact surface 321. The bottom of the moving tool support 32 has two symmetrically arranged fingers 33, and the inner side of each finger 33 has a slot 331. The transmission component 4 has a U-shaped slot 41, and the two fingers 33 engage with the U-shaped slot 41 through the slot 331, thereby connecting the moving tool support 32 and the transmission component 4.

[0047] When assembling the blade assembly 100, the moving blade 31 is first assembled into the mounting groove 14, then the rectangular metal sheet for making the fixed blade 2 is placed over the mounting groove 14, and the two wings of the rectangular metal sheet are symmetrically folded backward so that the fixed blade 2 is wrapped around the outside of the fixed blade holder 1. Finally, the fixed blade 2 is welded to the fixed blade holder 1 to complete the assembly of the moving blade 31, the fixed blade 2 and the fixed blade holder 1.

[0048] Example 2

[0049] This embodiment proposes a blade assembly 100, which differs from Embodiment 1 only in that: in Embodiment 1, the fixed blade 2 is wrapped around the outside of the fixed blade holder 1, and the fixed blade 2 is a folded blade, while in this embodiment, the fixed blade 2 is plate-shaped. Specifically, as shown in Figures 7 to 9, one side of the fixed blade holder 1 with the mounting groove 14 has an embedding groove 17, and the fixed blade 2 is embedded in the embedding groove 17. For reinforcement, it is preferable that the fixed blade 2 is welded to the fixed blade holder 1.

[0050] Except for the structure of the fixed blade 2, which differs from that of Example 1, the rest of the structure in this embodiment is the same as that in Example 1, and will not be described again here.

[0051] Example 3

[0052] Based on the blade assembly 100 disclosed in Embodiment 1 or Embodiment 2, since the fixed blade holder 1 is made of a thin sheet of metal folded together, in order to avoid the two ends of the fixed blade holder 1 being too sharp and causing damage to the human body or other objects, this embodiment also adopts safety protection measures for the two ends of the fixed blade holder 1.

[0053] As shown in Figure 10, protective end caps 19 are inserted into both ends of the fixed tool holder 1. The end faces of the protective end caps 19 are smooth, which can provide safety protection for both ends of the fixed tool holder 1 and prevent the ends of the fixed tool holder 1 from causing damage to the human body or other objects. The protective end caps 19 are preferably metal caps, which are preferably interference-fitted or welded to both ends of the fixed tool holder 1.

[0054] The preparation steps of the fixed tool holder 1 proposed in this embodiment include: firstly, symmetrically folding the two side wings 12 of the rectangular metal sheet 11 to form the fixed tool holder 1, and then inserting protective end caps 19 into the outside of both ends of the fixed tool holder 1.

[0055] Example 4

[0056] As shown in Figure 11, the difference between this embodiment and embodiment 3 is that the safety protection measures adopted for both ends of the fixed tool holder 1 in this embodiment are as follows: first, the edges of both ends of the rectangular metal sheet 11 are folded outward to form flanges 110, and then the two wings 12 of the rectangular metal sheet 11 with flanges 110 are symmetrically folded to form the fixed tool holder 1. The flanges 110 are smooth structures, which can blunt the edges of both ends of the fixed tool holder 1, thereby providing safety protection for both ends of the fixed tool holder 1.

[0057] In this embodiment, the fixed blade holder 1 uses an integrally formed flange 110 on a rectangular metal sheet 11 for safety protection. Compared with the protective end cap 19 in embodiment 3, the structure is simpler and the manufacturing process is easier.

[0058] Example 5

[0059] As shown in Figure 12, the difference between this embodiment and embodiments 3 and 4 is only that the safety protection measures adopted for both ends of the fixed tool holder 1 in this embodiment are as follows: First, metal strips 111 are provided on the outer surface of both ends of the rectangular metal sheet 11. Then, the two side wings 12 of the rectangular metal sheet 11 with metal strips 111 are symmetrically folded to form the fixed tool holder 1. The metal strips 111 themselves have smooth edges, and the setting of metal strips 111 can increase the thickness of both ends of the fixed tool holder 1, thereby providing safety protection for both ends of the fixed tool holder 1. The metal strips 111 are preferably welded to the rectangular metal sheet 11.

[0060] In this embodiment, the fixed tool holder 1 is protected by adding a metal strip 111 to the edge of the rectangular metal sheet 11. Compared with the protective end cap 19 of embodiment 3, the structure is simpler and the manufacturing process is easier.

[0061] Example 6

[0062] This embodiment proposes a hair cutting tool, including a blade assembly 100 disclosed in any one of embodiments 1 to 5. The installation method and operating principle of the blade assembly 100 in the hair cutting tool are mature technologies, and specific details can be found in related technologies, such as the electric beard trimmer disclosed in Chinese Patent Publication No. CN115551685A, which will not be elaborated here.

[0063] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A blade assembly for a hair-cutting tool, characterized in that, include: The fixed blade assembly (5) includes a fixed blade seat (1) and a fixed blade (2). The fixed blade seat (1) is formed by symmetrically folding two side wings (12) of a rectangular metal sheet (11). The outer edges of the two side wings (12) are joined together, and a guide groove (13) is provided at the joint of the two side wings (12). On the side of the fixed blade seat (1) opposite to the side wings (12), an installation groove (14) for mounting the movable blade (31) is provided. Comb-shaped teeth (15) are provided at the bending positions on both sides of the fixed blade seat (1). The fixed blade (2) is disposed on the fixed blade seat (1) and covers the installation groove (14). Fixed blade teeth (21) are provided on both sides of the fixed blade (2). The fixed blade teeth (21) and the comb-shaped teeth (15) are arranged one-to-one. The moving blade assembly (3) includes a moving blade (31), which is movably installed in the mounting groove (14) and located between the fixed blade holder (1) and the fixed blade (2). Moving blade teeth (311) are provided on both sides of the moving blade (31), and the moving blade teeth (311) are exposed at the tooth intervals of the comb-shaped teeth (15).

2. The blade assembly according to claim 1, characterized in that, The mounting groove (14) is a rectangular groove and is located at the center of the rectangular metal sheet (11).

3. The blade assembly according to claim 1, characterized in that, The outer edges of the two side wings (12) of the rectangular metal sheet (11) are provided with notches (16). After the outer edges of the two side wings (12) are joined together, the notches (16) of the two side wings (12) are joined together to form the guide groove (13).

4. The blade assembly according to claim 1, characterized in that, The fixed blade holder (1) has an embedding groove (17) on one side where the mounting groove (14) is provided, and the fixed blade (2) is embedded and fixed in the embedding groove (17); Alternatively, the fixed blade (2) is formed by symmetrically folding two wings of a rectangular metal sheet, and the fixed blade (2) is wrapped around the outside of the fixed blade holder (1). The fixed blade teeth (21) are provided at both bent positions of the fixed blade (2).

5. The blade assembly according to claim 4, characterized in that, The fixed blade holder (1) is provided with one side of the mounting groove (14) being an outwardly convex curved surface (18), and the fixed blade (2) is an overall convex blade adapted to the outwardly convex curved surface (18).

6. The blade assembly according to claim 1, characterized in that, Protective end caps (19) are inserted into both ends of the fixed tool holder (1) to provide safety protection for both ends of the fixed tool holder (1); Alternatively, both ends of the fixed tool holder (1) are folded outward with flanges (110), which can blunt the edges of both ends of the fixed tool holder (1) to provide safety protection for both ends of the fixed tool holder (1). Alternatively, metal strips (111) are provided on the outer surfaces of both ends of the fixed tool holder (1). The metal strips (111) can increase the thickness of the two ends of the fixed tool holder (1) to provide safety protection for both ends of the fixed tool holder (1).

7. The blade assembly according to claim 1, characterized in that, The fixed tool holder (1) is provided with a fixed tool bracket (112) on one side of the guide groove (13). The fixed tool bracket (112) has fixing ears (113) at both ends, and each fixing ear (113) has a mounting hole (114).

8. The blade assembly according to claim 7, characterized in that, Two sets of cantilever arms (312) are symmetrically arranged on the moving blade (31), and the moving blade assembly (3) further includes: A movable tool holder (32) is located inside the fixed tool holder (112), and both ends of the movable tool holder (32) pass through the fixed tool holder (112) and the guide groove (13) in sequence. The two ends of the movable tool holder (32) are respectively connected to two sets of cantilever (312). Two insert fingers (33) are symmetrically arranged at the bottom of the movable tool holder (32), and a slot (331) is provided on the inner side of any one of the insert fingers (33). The transmission component (4) is provided with a "U"-shaped slot (41), and the two insertion fingers (33) are engaged with the "U"-shaped slot (41) through the slot (331).

9. A method for preparing the blade assembly according to any one of claims 5 to 8, characterized in that, The preparation steps of the fixed tool holder (1) include: First, fold the two wings (12) of the rectangular metal sheet (11) symmetrically to form the fixed tool holder (1), and then insert protective end caps (19) on both ends of the fixed tool holder (1). Alternatively, the two ends of the rectangular metal sheet (11) are first folded outward to form flanges (110), and then the two wings (12) of the rectangular metal sheet (11) with the flanges (110) are symmetrically folded to form the fixed knife holder (1). Alternatively, metal strips (111) can be provided on the outer surfaces of both ends of the rectangular metal sheet (11), and then the two wings (12) of the rectangular metal sheet (11) with the metal strips (111) can be symmetrically folded to form the fixed knife holder (1).

10. A hair cutting tool, characterized in that, Includes the blade assembly (100) as described in any one of claims 1 to 8.

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