Hair cutting assembly and manufacturing method thereof

Abstract

The invention discloses a hair cutting assembly which comprises a fixed knife and a bottom frame, the fixed knife is fixed to the bottom frame and comprises a fixed knife body, side fixed knife teeth are arranged on the front side and / or the rear side of the fixed knife body, the top face of the fixed knife body and the top face of the side fixed knife teeth serve as skin contact faces, a movable knife is arranged below the fixed knife, side movable knife teeth are arranged on the movable knife, and the side movable knife teeth are arranged on the movable knife. The side movable cutter teeth are located on the inner sides of the head portions of the side fixed cutter teeth, the left sides and the right sides of the side movable cutter teeth are provided with movable cutting edges with acute angles respectively, a middle installation hole is formed in the position, located on the inner sides of the side fixed cutter teeth, of the middle of the fixed cutter body, a middle cutter net upwards exposed out of the middle installation hole is arranged between the bottom frame and the fixed cutter, and the material thickness of the middle cutter net ranges from 0.04 mm to 0.15 mm. The thickness of the side fixed cutter teeth is larger than that of the middle cutter net, a middle cutter assembly is arranged below the middle cutter net and comprises a middle cutter, and the side fixed cutter has the advantages of being sharp in cutting, good in safety and comfortable in skin feeling. The invention further discloses a manufacturing method of the hair cutting assembly.

Description

[Technical Field]

[0001] This invention relates to a hair cutting component, and also to a method for manufacturing the hair cutting component. [Background Technology]

[0002] Currently available shavers, such as the one with patent number CN300736959D, named "Women's Shaver (ML-258)," typically have a cutting section with a structure similar to that disclosed in patents such as CN308103438S, named "Hair Trimming Scissor Head (N19)," and CN205660764U, named "A Shaver Head Assembly." These shavers generally consist of two parts: an edge cutting section near the edge and a central mesh cutting section. The edge cutting section is used to trim long hairs, while the central mesh cutting section is used for a clean shave. The edge cutting section consists of fixed side teeth on a fixed blade and moving side teeth on a moving blade. The moving side teeth on the moving blade protrude from the top of the shaver head. The top of the shaver head moves close to the skin during shaving. During shaving, the moving side teeth on the moving blade of the edge cutting section easily contact the skin, thus protecting the skin. It produces strong irritation and has a poor skin feel. In addition, in order to avoid the side blades from cutting the skin, a blade cap is usually installed above the blade. The blade cap forms a step that rises above the side blades. The step first presses against the skin, lifting the side blades and reducing the contact between the side blades and the skin. This inevitably leaves longer hairs after the side blades cut. Longer hairs are not easy to enter the mesh and be cut in the middle of the blade mesh, thus reducing the efficiency of shaving. At the same time, the cutting sharpness of the side blades and the side fixed blades is not high. One is to ensure safety and avoid the exposed blades from cutting the skin, and the other is also due to the structure of the side blades and the side fixed blades themselves. Therefore, general razors are used to shave sparse and soft hair such as hand and leg hair. When shaving dense and coarse hair, it is easy to pull hair.

[0003] In addition, the combination of the side blade cutting and the middle blade mesh cutting parts results in a bulky size, and the shape and structure affect the skin feel and appearance. It is necessary to set a groove on the main body of the shaver to accommodate the blade head and protect the sides of the blade head, which makes the entire shaver cutting head relatively large. It is difficult to reduce the size while maintaining the aesthetics. Moreover, the top has many uneven steps, which makes it uncomfortable to move when it is close to the skin.

[0004] This invention was made based on this situation. [Summary of the Invention]

[0005] The technical problem to be solved by the present invention is to provide a hair cutting component that has the characteristics of sharp cutting, good safety and comfortable skin feel.

[0006] To solve the above-mentioned technical problems, the present invention provides a hair cutting assembly, including a fixed blade and a base frame. The fixed blade is fixed on the base frame and includes a fixed blade body. The front and / or rear sides of the fixed blade body are provided with a plurality of side fixed blade teeth arranged in a left-right direction. The top surfaces of the fixed blade body and the side fixed blade teeth serve as skin contact surfaces. Below the fixed blade is a movable blade that can move left and right. The movable blade is provided with side movable blade teeth located below the side fixed blade teeth. The side movable blade teeth are located inside the heads of the side fixed blade teeth. The left and right sides of the side movable blade teeth are respectively provided with acute-angled moving blade edges. The middle part of the fixed blade is provided with a central mounting hole located inside the side fixed blade teeth. Between the base frame and the fixed blade is a central blade mesh that protrudes upward from the central mounting hole. The material thickness of the central blade mesh is between 0.04mm and 0.15mm. The thickness of the side fixed blade teeth is greater than the thickness of the central blade mesh. Below the central blade mesh is a central blade assembly, which includes a central blade that can move left and right against the bottom of the central blade mesh.

[0007] In the hair cutting assembly described above, the angle β formed between the side surface and the top surface of the moving blade at the cutting edge position is ≤50°, and the side moving blade teeth are formed into two arc-shaped sides by etching.

[0008] As described above, in a hair cutting assembly, the fixed blade is rigid, and the top of the fixed blade body is low on both the front and rear sides and gradually increases towards the center to form an arched part. The central mounting hole penetrates the arched part vertically and is located on the inner side of the left and right ends of the arched part. The intermediate blade mesh protrudes upward from the central mounting hole onto the front and rear sides of the fixed blade body, corresponding to the arched part.

[0009] As described above, in a hair cutting assembly, the bottom of the fixed blade body is provided with a blade mesh fixing part outside the middle mounting hole. The blade mesh fixing part communicates with the middle mounting hole, and the middle blade mesh is fixed on the blade mesh fixing part.

[0010] In one embodiment of the hair cutting assembly described above, the intermediate blade mesh is an upwardly convex continuous arc-shaped structure. The central mounting hole is a rectangular hole whose length direction is along the left-right direction of the fixed blade body. The blade mesh fixing part is an inwardly sloping downward inclined surface provided on the front and rear side walls of the central mounting hole. In the front-rear direction, the width of the intermediate blade mesh is greater than the width of the central mounting hole, and the front and rear sides of the intermediate blade mesh are attached to the inclined surface to form a continuous arc-shaped structure convex upward from the central mounting hole. Preferably, the angle b of the inclined surface relative to the vertical direction f is ≥ 40°. When the inscribed circle r formed by the front and rear inclined surfaces is located above the middle of the corresponding inclined surface, the inscribed circle r is lower than the top surface of the arched part. The front and rear sides of the intermediate blade mesh are laser-welded to the inclined surface, and the intermediate blade mesh is lower than the top surface of the arched part.

[0011] In another embodiment, the intermediate blade includes a top and a surrounding edge that bends downward from the top, the top protruding upward from a central mounting hole, and the lower edge of the surrounding edge being lower than the upper edge of the central mounting hole.

[0012] As described above, in a hair cutting assembly, the outer edge of the top of the net is provided with a ring, and the outer edges at the left and right ends and the outer edges at the front and back ends are transitioned by rounded corners. When viewed in the front-back direction, the top of the net protrudes upward into an arc shape corresponding to the arched part, and the top of the net is level with or slightly higher than the top surface of the arched part from front to back.

[0013] As described above, the hair cutting component has a central mounting hole comprising four holes: front, back, left, and right. The left and right holes are arc-shaped structures with their concave sides facing the inside of the central mounting hole. The left and right holes are connected to the front and back holes by inner rounded corners. The surrounding edges at the left and right ends protrude outwards in an arc-shaped structure corresponding to the left and right holes of the central mounting hole.

[0014] As described above, a hair cutting assembly has an outwardly bent flange on the perimeter, which rests on the blade mesh fixing part from bottom to top and is fixed thereto.

[0015] As described above, in a hair cutting assembly, the blade fixing part consists of several grooves respectively provided on the front and rear sides of the central mounting hole, and the outer flange is welded and fixed in the grooves.

[0016] In the hair cutting assembly described above, the top surface of the arched portion serves as part of the top surface of the fixed blade body. The top surface of the arched portion intersects with the left and right side surfaces of the fixed blade body, and the two are smoothly connected. Each side surface protrudes outward from its respective end to form an arc-shaped structure. The intersection line of the top surface and the side surfaces of the fixed blade body, or the line where they intersect or extend to intersect, is a three-dimensional spatial curve. The top surface and the side surfaces of the arched portion are smoothly connected by chamfers, and the chamfers are of the same size, or the chamfers decrease in size from the top of the arched portion to both sides.

[0017] In the hair cutting assembly described above, the curvature of the top surface of the arched portion is different from the curvature of the top surface of the side-fixed blade teeth. When viewed from the left and right direction, the extension line L of the top surface of the side-fixed blade teeth to one side of the arched portion is located below the top surface of the arched portion. The height d of the top of the arched portion from the side-fixed blade teeth and the thickness t of the side-fixed blade teeth satisfy t≤d≤5t.

[0018] As described above, in a hair cutting assembly, the fixed blade body is formed by powder metallurgy, and the side fixed blade teeth are integrally injection molded with the fixed blade body. The left and right sides of the side fixed blade teeth each have an acute-angled fixed blade edge.

[0019] In the hair cutting assembly described above, the head of the side-fixing blade is provided with a thickening head, which is larger than the tooth body of the side-fixing blade near the thickening head.

[0020] As described above, a hair cutting assembly includes a base frame with base ends located at the left and right ends, and a side fixed blade tooth corresponding to each side. A recessed clearance groove is provided between the left and right base ends, extending inward from the front and / or rear side of the base frame. The clearance groove allows the side fixed blade tooth to protrude from below the base frame and suspend outside the base frame. Fixed blade ends are respectively provided on the left and right ends of the fixed blade body, located outside the multiple side fixed blade teeth. The fixed blade ends have smooth outer surfaces, and the outer surfaces of the fixed blade ends smoothly transition to the top surface. The outer surfaces of the fixed blade ends form a U-shaped or C-shaped structure from front to back. The corresponding outer surfaces of the base ends are U-shaped or C-shaped structures. The outer surfaces of the base ends and the fixed blade ends are aligned or substantially aligned.

[0021] As described above, a hair cutting assembly includes a base frame comprising a base frame body. The end of the base protrudes upward above the base frame body, forming a space between the base frame body and the fixed blade to accommodate the moving blade and allow the moving blade to move left and right. A first welding part is provided on the inner side of the end of the base frame, and a second welding part is provided on the bottom of the fixed blade, which can be laser welded to the first welding part. The second welding part is located on the inner side of the outer side of the end of the fixed blade. The base frame is provided with a laser through hole for the first welding part to protrude from the bottom of the base frame so that a laser can enter and weld the first welding part to the second welding part.

[0022] As described above, in a hair cutting assembly, the bottom of the fixed blade has upwardly recessed positioning holes on the inner sides of both its left and right ends. These positioning holes are located outside the central mounting hole. The top of the base frame has a positioning post that inserts upward into the positioning hole. The sidewall of the positioning post serves as a first welding part, and the outer side of the positioning hole serves as a second welding part. The positioning post is integrally formed with the base frame, or it can be a separate component. Its upper end is inserted into the positioning hole and welded to the fixed blade, while its lower end presses against the base frame from bottom to top. The left and right ends of the moving blade have concave clearance grooves, and the positioning post is positioned corresponding to these clearance grooves in the left-right direction.

[0023] As described above, in a hair cutting assembly, the base frame has a suspension groove integrally formed at the bottom of both the left and right ends, and the left side wall and / or right side wall of the suspension groove are provided with shaft holes, and the laser through hole is provided at the top of the suspension groove.

[0024] As described above, in a hair cutting assembly, a drive device is provided between the fixed blade and the base frame for driving the moving blade and intermediate blade assembly to reciprocate left and right. A support device is provided below the moving blade and intermediate blade assembly for supporting the moving blade and intermediate blade assembly upward. The intermediate blade is mounted and fixed by an intermediate bracket.

[0025] As described above, in a hair cutting assembly, the moving blade has a moving blade hole in the middle to accommodate an intermediate blade assembly. The moving blade is a sheet-like structure. The intermediate blade assembly passes through and is located within the moving blade hole. The left and right ends of the moving blade hole have extension holes extending outward on the front and rear sides, respectively. An inner connecting plate is formed between the front and rear extension holes at each end. The intermediate support is located between the two inner connecting plates. The intermediate blade has an inverted U-shaped structure. The left and right ends of the intermediate blade extend outward beyond the left and right ends of the intermediate support, and the sidewalls on the left and right ends of the intermediate blade are inserted into the extension holes.

[0026] As described above, in a hair cutting assembly, the support device includes a first elastic structure acting on a central support to elastically press a central blade upward against the bottom of a central blade mesh, and a moving blade support structure for supporting a moving blade from below. The moving blade support structure includes a support bar arranged on a base frame in a left-right direction and / or a ball bearing that can roll on the base frame. Alternatively, the moving blade support structure may be a second elastic structure that elastically presses the moving blade upward, wherein the second elastic structure and the first elastic structure are integrally formed.

[0027] As one embodiment of the driving device, the driving device includes a driving connection structure disposed on a middle support, the middle support being connected to the moving blade and moving together with the moving blade when moving left and right;

[0028] As described above, in a hair cutting assembly, the drive connection structure is integrally formed with the intermediate support, the drive connection structure is provided with a drive connection groove for connecting with an external drive device, the base frame is integrally formed with a suspension groove at the bottom of the left and right ends, and the left side wall and / or right side wall of the suspension groove are provided with a shaft hole, the center line of the shaft hole passes through the drive connection groove.

[0029] As described above, in a hair cutting assembly, one of the moving blades and the intermediate support is provided with a drive hole, and the other is provided with a drive post. The intermediate support and the moving blade are connected by the drive post and the drive hole, allowing the intermediate support to move up and down relative to the moving blade.

[0030] As another embodiment of the driving device, the driving device includes a driving connection structure for connecting to an external driving device, and a tool connector. The tool connector is fixed below the moving tool. The driving connection structure is connected to the tool connector and moves left and right together with the tool connector and the moving tool when the driving connection structure moves left and right. The intermediate support is provided with a toggle hole. The tool connector is provided with a toggle rod inserted into the toggle hole for moving the intermediate support left and right together when the tool connector moves left and right. The toggle rod cooperates with the toggle hole to allow the intermediate tool assembly to float up and down relative to the toggle rod.

[0031] As described above, in a hair cutting assembly, the base frame has a movable groove on the middle part that allows the tool connector to move left and right from left to right. The bottom of the intermediate support has a slider that is inserted into the movable groove. The slider slides in cooperation with the movable groove to allow the intermediate support to slide in the left and right direction. The slider has a limiting groove that allows the tool connector to be inserted and restricts the forward and backward movement of the tool connector.

[0032] Another technical problem to be solved by the present invention is to provide a method for manufacturing a hair cutting component.

[0033] To solve the above-mentioned technical problems, the present invention provides a method for manufacturing a hair cutting component, comprising the following steps:

[0034] A. Manufacturing the fixed tool, base frame, intermediate tool holder, moving tool, and intermediate tool assembly, among which...

[0035] The fixed blade is manufactured by powder metallurgy forming process. Its front and / or rear sides are integrally injection molded with multiple side fixed blade teeth. The left and right sides of the side fixed blade teeth have sharp-angled fixed blade edges. The top of the fixed blade is integrally formed with an arched part that is low on the front and rear sides and high in the middle, as well as a central mounting hole that runs through the arched part from top to bottom. A blade net fixing part that communicates with the central mounting hole is formed at the bottom of the fixed blade.

[0036] The center blade mesh is made of stainless steel sheet. The four sides of the center blade mesh are bent downward to form a structure with a mesh top and four surrounding edges. The edges are bent outward from the bottom to form an outward flange.

[0037] The moving blade is manufactured by etching process. The moving blades on the left and right sides of the moving blades are at the cutting edge position, and the angle β formed between the side and the top surface is ≤50°.

[0038] B. Insert the middle blade mesh into the middle mounting hole, and attach the outer flange to the blade mesh fixing part from bottom to top and weld or glue it in place.

[0039] C. First, install the moving knife and intermediate knife assembly on the base frame. Then, install the fixed knife on the base frame from top to bottom so that the side fixed knife teeth and the side moving knife teeth are facing each other. Install the intermediate knife assembly into the intermediate knife net and fix the fixed knife to the base frame so that the moving knife and intermediate knife assembly are limited between the fixed knife and the base frame.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] 1. In this invention, the fixed blade is fixed on the base frame. The top surface of the fixed blade body and the side fixed blade teeth serve as the skin contact surface. As the top surface of the fixed blade, it is advantageous to make it into a smooth plane or curved surface. The top of the fixed blade and the top of the middle blade net exposed upward from the central mounting hole form the top of the hair cutting assembly. When shaving, the skin contact surface and the top surface of the middle blade net move against the skin. The moving blade is located below the fixed blade, and the side moving blade teeth are located inside the head of the side fixed blade teeth to avoid the moving blade contacting the skin. The side moving blade teeth have sharp-angled moving blades. When the side moving blade teeth reciprocate at high speed, they cooperate with the side fixed blade teeth to cut sharply and avoid pulling hair. The hair cutting assembly has a better skin feel and comfort when shaving.

[0042] 2. The side-moving blade teeth are formed with two arc-shaped sides through an etching process. The angle β between the tangent line at the cutting edge of the moving blade and its top surface on both sides of the side-moving blade teeth is ≤45°, making the cutting edge of the side-moving blade teeth sharper. Through high-speed reciprocating motion, in conjunction with the fixed blade teeth, it is easier to cut thick and coarse hair. Generally, a motor with a speed of 3000 RPM or higher is used as the drive source to drive the high-speed motion.

[0043] 3. The fixed blade is rigid, not easily deformed, and has good structural strength. The top of the fixed blade body is made to be low on the front and back sides and gradually rises towards the middle to form an arched part. The mounting hole in the middle runs through the arched part from top to bottom and is located on the inner side of the left and right ends of the arched part. The middle blade mesh protrudes upward from the middle mounting hole on the front and back sides of the fixed blade body, corresponding to the arched part, so that the middle blade mesh can better contact and press against the skin during shaving, thereby improving the efficiency of the middle blade mesh in shaving. When shaving, the central foil and the arched part are pressed against the skin. The arched part corresponds to the upward-protruding central foil, so as to cover the protruding central foil or the protruding component that cooperates with the central foil from both sides. This avoids the central foil or the protruding component that cooperates with the central foil forming a large step with a large difference in height between the left and right sides of the fixed blade body. This allows the top of the hair cutting component to transition more smoothly and improves the skin feel when the top of the hair cutting component is in contact with the skin. In addition, while improving the skin feel, it also helps the central foil to protrude to a certain height so that it can better shave cleanly on the skin.

[0044] 4. The fixed blade is formed by powder metallurgy, which facilitates the one-time molding of multiple side fixed blade teeth and sharp-angled fixed blades, as well as the top surface with an arched part. The structure is simple and easy to manufacture. The arched part is used to correspond to the upward-protruding middle blade net to cover the left and right ends of the middle blade net and avoid the left and right ends of the middle blade net from irritating the skin. The arched part is smoothly transitioned or basically smoothly transitioned to the front and back sides, so that the top of the hair cutting component has a relatively gentle curved surface transition from front to back, improving the skin feel when the top of the hair cutting component is in contact with the skin.

[0045] 5. The outer sides of the base end and the fixed blade end are aligned or substantially aligned, and the fixed blade end has a smooth outer side, and the outer side of the fixed blade end smoothly transitions with the top surface, so that the left and right ends of the hair cutting component have a better skin feel when in contact with the skin, avoiding skin irritation, and improving the user experience when shaving body parts such as armpits and inner thighs.

[0046] 6. By providing a first welding part on the inner side of the base end on the base frame, and a second welding part on the bottom of the fixed knife that can be laser welded to the first welding part, the second welding part is located on the inner side of the outer side of the fixed knife end. The base frame is provided with a laser through hole for the first welding part to protrude from the bottom of the base frame so that the laser can enter and weld the first welding part to the second welding part. The fixed knife and the base frame are fixed by laser welding. The process is simple and convenient. After welding, the weld point of the first welding part and the second welding part is located on the inner side of the fixed knife and the base frame, avoiding exposure to the skin and affecting the skin feel and damaging the appearance.

[0047] 7. The blade mesh is fixed by inwardly sloping downwards on the front and rear side walls of the central mounting hole. The angle b of the sloping surface relative to the vertical direction f is ≥40°, preferably between 50° and 70°. The front and rear sides of the central blade mesh are attached to the sloping surface, forming an arc-shaped structure convex upwards from the central mounting hole. This simple structure facilitates the arching of the central blade mesh into a circular or near-circular shape, allowing for better contact with the lower central blade to cut hair and preventing uneven cutting and hair pulling. Furthermore, the front and rear sides of the central blade mesh are laser-welded to the sloping surface. Since the sloping surface is located inside the central mounting hole, the weld points are prevented from being exposed on the top and outer surfaces of the fixed blade. Additionally, the area below the central blade mesh corresponding to the central mounting hole is left unsupported, allowing the central blade to cover a wider area and increasing the effective cutting area.

[0048] 8. When the inscribed circle r formed by the front and rear blade fixing parts is located above the middle of the corresponding blade fixing parts, the inscribed circle r is lower than the top surface of the arched part. This makes it easier for the front and rear sides of the middle blade to arch upwards on the blade fixing parts, so that the middle blade is lower than the top surface of the arched part. This avoids the left and right ends of the middle blade being exposed and irritating the skin, and also avoids the curvature of the middle blade being too large, allowing the middle blade to better form an arc structure. [Attached Image Description]

[0049] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0050] Figure 1 This is an exploded view of a hair cutting component according to the present invention;

[0051] Figure 2 This is a schematic diagram of the structure of a hair cutting component according to the present invention;

[0052] Figure 3 This is a schematic diagram of the top structure of a hair cutting component according to the present invention;

[0053] Figure 4 This is a schematic diagram of the bottom structure of a hair cutting component according to the present invention;

[0054] Figure 5 This is a bottom schematic diagram of the fixed blade of the present invention;

[0055] Figure 6 This is a cross-sectional view of the fixed blade of the present invention;

[0056] Figure 7 It is a fixed blade edge Figure 6 A cross-sectional view along the DD direction;

[0057] Figure 7a yes Figure 7 Enlarged cross-section view of the side fixed cutter tooth E in the middle;

[0058] Figure 8 This is a bottom schematic diagram of the fixed blade and intermediate blade mesh of the present invention;

[0059] Figures 9a-9b These are cross-sectional views of two different fixed-blade and intermediate-blade meshes;

[0060] Figure 10 This invention provides a hair cutting component along... Figure 11 A cross-sectional view along the CC direction;

[0061] Figure 11 This invention provides a hair cutting component along... Figure 10 A cross-sectional view along the AA direction;

[0062] Figure 12 This invention provides a hair cutting component along... Figure 10 Cross-sectional view along the BB direction;

[0063] Figure 13 This is a schematic diagram of the base frame in this invention with the first elastic structure and the second elastic structure installed.

[0064] Figures 14-15 It is a structural schematic diagram of the moving blade, intermediate blade assembly, and drive device;

[0065] Figure 16 This is a schematic diagram of an embodiment of a hair cutting assembly of the present invention, in which the moving blade support structure adopts a support strip;

[0066] Figure 17 This is a schematic diagram of an embodiment of the moving blade support structure in a hair cutting assembly of the present invention, which uses a support bar and ball bearings;

[0067] Figure 18 This is a schematic diagram of an embodiment where the intermediate blade mesh has anti-detachment holes;

[0068] Figure 19 This is a schematic diagram of an embodiment of a hair cutting assembly of the present invention, in which the intermediate blade mesh is movably mounted vertically in the middle mounting hole;

[0069] Figure 20 This is a schematic diagram of an embodiment in which a U-shaped intermediate blade is mounted on a fixed blade;

[0070] Figure 21 This is a schematic diagram of another embodiment of the first welded part of the base frame;

[0071] Figure 22 This is a schematic diagram of another embodiment of the second welding part of the fixed blade;

[0072] Figure 23 This is a schematic diagram of an embodiment of the hair cutting component of the present invention, which employs another first welding part and a second welding part;

[0073] Figure 24 This is a cross-sectional view of another type of fixed tool and intermediate tool net;

[0074] Figure 25 This is a structural diagram of an embodiment in which the fixed tool and the base frame are fixed using independent positioning pins;

[0075] Figure 26 It is the edge of the moving blade. Figure 14 A schematic diagram of the cross-section at FF in the diagram;

[0076] Figure 27This is a schematic diagram of an embodiment of the hair cutting component of the present invention, which uses a central blade mesh with a surrounding edge;

[0077] Figure 28 This is a bottom schematic diagram of an embodiment of a hair cutting component with a hanging groove according to the present invention;

[0078] Figure 29 yes Figure 27 Exploded view of the embodiment;

[0079] Figure 30 This is a schematic diagram of the structure of the intermediate blade and the fixed blade cooperating with the groove through the outward flange;

[0080] Figure 31 This is a top view of a hair cutting component according to the present invention;

[0081] Figure 32 It is along Figure 31 Cross-sectional view along the GG direction;

[0082] Figure 33 It is along Figure 31 Cross-sectional view along the HH direction;

[0083] Figure 34 This is a schematic diagram of an embodiment where the fixed tool has more than one central mounting hole;

[0084] Figures 35-36 This is a schematic diagram of the intersection line when the top surface and side end face of the fixed tool body intersect.

[0085] Figure 37 This is a schematic diagram of the structure of a hair cutting component installed on a blade holder according to the present invention;

[0086] Figure 38 This is a side view of a hair cutting assembly of the present invention mounted on a blade holder;

[0087] Figure 39 It is along Figure 38 A cross-sectional view along the JJ direction;

[0088] Figure 40 It is a cross-sectional view of a central knife-wire mesh with surrounding edges.

Detailed Implementation Methods

[0089] The present invention will now be further described with reference to the accompanying drawings:

[0090] like Figures 1 to 36The diagram illustrates a hair-cutting assembly for use in the head of a shaver. The assembly includes a fixed blade 1 and a base 2. The fixed blade 1 is fixed to the base 2 and includes a fixed blade body 11. Multiple side fixed blade teeth 12 arranged in a left-right direction are provided on the front and rear sides of the fixed blade body 11. Alternatively, side fixed blade teeth 12 can be provided only on the front or rear sides of the fixed blade body 11; this is omitted from the diagram. The top surfaces of the fixed blade body 11 and the side fixed blade teeth 12 serve as skin contact surfaces 10. A movable blade 4 capable of left-right movement is located below the fixed blade 1. The movable blade 4 has side movable blade teeth 41 located below the side fixed blade teeth 12 and used to cooperate with the side fixed blade teeth 12 to cut hair. The side movable blade teeth 41 are located inside the heads of the side fixed blade teeth 12 to prevent them from contacting the skin when cutting hair during reciprocating motion relative to the side fixed blade teeth 12. The side moving blades 41 have sharp-angled moving blades 411 on both the left and right sides to improve the sharpness of the cut. In particular, the angle β formed between the side and the top surface of the moving blades 411 at the cutting edge position is ≤50°. The middle part of the fixed blade body 11 is provided with a middle mounting hole 13 located inside the side fixed blades 12. Between the base frame 2 and the fixed blade 1, there is a middle blade net 3 that protrudes upward from the middle mounting hole 13. The material thickness of the middle blade net 3 is between 0.04mm and 0.15mm to facilitate a clean shave. The thickness of the side fixed blades 12 is greater than the thickness of the middle blade net 3. A middle blade assembly 5 is provided below the middle blade net 3. The middle blade assembly 5 includes a middle blade 51 that can move left and right against the bottom of the middle blade net 3. When the middle blade 51 moves against the middle blade net 3, it cuts off the hair that enters from the mesh of the middle blade net.

[0091] The fixed blade 1 is fixed on the base frame 2. The top surface of the fixed blade body 11 and the side fixed blade teeth 12 serves as the skin contact surface 10. It is the top surface of the fixed blade 1, which is conducive to making a smooth plane or curved surface. The top of the fixed blade 1 and the top of the middle blade net 3 exposed from the middle mounting hole 13 form the top of the hair cutting assembly. When shaving, the skin contact surface 10 and the top surface of the middle blade net 3 move against the skin. The moving blade 4 is located below the fixed blade 1 and the side moving blade teeth 41 are located inside the head of the side fixed blade teeth 12 to avoid the moving blade from contacting the skin. The side moving blade teeth 41 have a sharp-angled moving blade 411. When the side moving blade teeth 41 reciprocate at high speed, they cooperate with the side fixed blade teeth 12 to cut sharply and avoid pulling hair. The hair cutting assembly has a good skin feel and comfort when shaving.

[0092] Preferably, such as Figure 26 As shown, the side-moving blade 41 is formed with two arc-shaped sides by etching process. The angle β between the tangent of the left and right sides of the side-moving blade 41 at the cutting edge position of the moving blade 411 and its top surface is ≤45°, which makes the cutting edge of the side-moving blade 41 sharper.

[0093] Of course, in order to further improve sharpness, the side fixed blade 12 also has a fixed blade edge 121 with an acute angle.

[0094] The side-mounted blade 12 is a suspended tooth with a thickness between 0.3mm and 0.6mm, used for combing and cutting longer hair; the middle blade mesh 3 is made of a metal sheet with mesh holes, the thickness of the metal sheet is between 0.04mm and 0.15mm, preferably 0.05mm and 0.08mm, used for shaving shorter hair and cleaning the hair.

[0095] Preferably, a rigid fixed blade 1 is used, which is not easily deformed and has good structural strength. The top of the fixed blade body 11 is low on the front and rear sides and gradually rises towards the middle to form an arched part 14. The middle mounting hole 13 passes through the arched part 14 vertically and is located on the inner side of the left and right ends of the arched part 14. The middle blade net 3 protrudes upward from the middle mounting hole 13 above the front and rear sides of the fixed blade body 11, corresponding to the arched part 14, so that the middle blade net 3 can better contact and press against the skin during shaving, thereby improving the shaving efficiency of the middle blade net 3.

[0096] Preferably, when viewed from the left and right, the top surface of the fixed blade body 11 smoothly transitions from the top of the arched portion 14 to the front and rear sides; or it transitions basically smoothly, such as by providing some recessed or raised patterns on the top of the fixed blade body 11.

[0097] When shaving, the central foil 3 and the arched portion 14 are pressed against the skin. The arched portion 14 corresponds to the upwardly protruding central foil 3, so as to cover the protruding central foil 3 or the protruding component that cooperates with the central foil from the left and right ends. This avoids the central foil 3 or the protruding component that cooperates with the central foil forming a step with a large height difference between the left and right ends of the fixed blade body 11, so that the top of the hair cutting component can be more smoothly transitioned, improving the skin feel when the top of the hair cutting component is in contact with the skin. In addition, while improving the skin feel, it is also beneficial to make the central foil 3 protrude to a certain height so as to better shave the skin.

[0098] In some embodiments, the intermediate blade 3 and its corresponding components can be installed vertically within the central mounting hole 13. The intermediate blade 3 can be significantly higher than the arched portion 14. When shaving, the intermediate blade 3 and its corresponding components are pressed down to the height of the arched portion 14 by pressing it onto the skin. In this state, the intermediate blade 3 corresponds to the arched portion 14 and protrudes upward to better adhere to the skin.

[0099] In other implementations, such as Figure 8-9b As shown in Figures 3 and 33, the intermediate blade mesh 3 is fixed on the fixed blade, and the height of the intermediate blade mesh 3 is close to the height of the arched part 14.

[0100] Preferably, the fixed blade body 11 is formed by powder metallurgy, which facilitates the formation of a fixed blade top with an arched portion 14 and a smooth or substantially smooth transition between front and back. Furthermore, the side fixed blade teeth 12 are integrally injection molded with the fixed blade body 11. The powder metallurgy forming of the fixed blade 1 allows for the one-time molding of multiple side fixed blade teeth 12, an acute-angled fixed blade edge 121, and a top surface with an arched portion 14, resulting in a simple structure and convenient manufacturing. Of course, the fixed blade body 11 can also be made from sheet metal through stamping or other processes.

[0101] Preferably, such as Figure 7a As shown, the left and right sides of the side-fixed cutting tooth 12 are respectively provided with downward and outward inclined tooth surfaces, formed by powder metallurgy. The tooth surface includes an upper inclined surface 122 and a lower inclined surface 123. Relative to the vertical direction f, the inclination angle of the lower inclined surface 123 is greater than the inclination angle of the upper inclined surface 122. The lower inclined surface 123 and the bottom surface of the side-fixed cutting tooth 12 form an acute-angled fixed cutting edge 121. The included angle α between the lower inclined surface 123 and the bottom surface of the side-fixed cutting tooth 12 is ≤70°, resulting in good sharpness. When forming the fixed cutting edge 121 with an included angle α ≤ 70°, the width of the side-fixed cutting tooth 12 is avoided to be too large.

[0102] The fixed blade body 11 is composed of an arched portion 14 and side plates 111 located on both sides of the arched portion 14. The side fixed blade teeth 12 are provided on the side plates 111, such as... Figure 6 As shown, the curvature of the top surface of the arched portion 14 is different from the curvature of the top surface of the side-fixed cutter tooth 12. Furthermore, when viewed from the left and right, the extension line L of the top surface of the side-fixed cutter tooth 12 towards one side of the arched portion 14 is located below the top surface of the arched portion 14. This allows the arched portion 14 to protrude to a certain height, preventing the side-fixed cutter tooth 12 from becoming too thick. Preferably, the height d of the top of the arched portion 14 from the side-fixed cutter tooth 12 and the thickness t of the side-fixed cutter tooth 12 satisfy t ≤ d ≤ 5t.

[0103] The bottom end of each side plate 111 has a bottom plane 16, and the bottom surface of the side fixed cutter tooth 12 is coplanar with the bottom plane 16, which facilitates the smoothing of the bottom surface of the side fixed cutter tooth 12.

[0104] Of course, it can also be like Figure 24 In the embodiment shown, the top surface of the fixed blade forms an overall upward convex arched structure from the front side fixed blade tooth 12 to the rear side fixed blade tooth 12.

[0105] like Figure 35 and 36As shown, the top surface of the arched portion 14 is part of the top surface of the fixed blade body 11. The top surface of the arched portion 14 intersects with the side end faces 172 at the left and right ends of the fixed blade body 11 and the two are smoothly connected. The side end face 172 at each end protrudes outward to form an arc-shaped structure. The intersection line i of the top surface and the side end face 172 of the fixed blade body 11 intersects or extends to intersect is a three-dimensional spatial curve, which improves the feel of the left and right ends of the fixed blade and the connection position between the left and right ends and the top surface.

[0106] The top surface and side end face 172 of the arched portion 14 are smoothly connected by a chamfer 174, such as Figure 36 As shown, the chamfers 174 are all the same size; or as... Figure 35 As shown, the chamfer 174 decreases in size from the top of the arch 14 to both sides.

[0107] Preferably, the fixed blade body 11 has fixed blade ends 17 located outside a plurality of side fixed blade teeth 12 on its left and right ends. The base frame 2 includes base ends 21 located at the left and right ends. Corresponding to each side fixed blade tooth 12, a recessed clearance groove 22 is provided between the left and right base ends 21, extending inward from the front and / or rear side of the base frame 2. The clearance groove 22 allows the side fixed blade teeth 12 to protrude from below the base frame 2 and suspend outside the base frame 2, so that the side fixed blade teeth 12 can better hook long hair for cutting. The outer surfaces of the base ends 21 and the fixed blade ends 17 are aligned or substantially aligned. The fixed blade ends 17 have smooth outer surfaces, and the outer surfaces of the fixed blade ends 17 smoothly transition to the top surface, so that the left and right ends of the hair cutting component have a better skin feel when in contact with the skin, avoiding skin irritation and improving the user experience when shaving body parts such as armpits and inner thighs.

[0108] Preferably, in order to better improve the smoothness and skin feel of the left and right ends of the hair cutting component, the outer side of the fixed blade end 17 forms a U-shaped or C-shaped structure from front to back, and the corresponding outer side of the base end 21 is a U-shaped or C-shaped structure.

[0109] The lowest end of the fixed blade body 11 is a bottom end plane 16. The bottom surfaces of the side fixed blade teeth 12 and the fixed blade end 17 are coplanar with the bottom end plane 16. The top surface of the base end 21 is close to or abuts the bottom surface of the fixed blade end 17. The outer edge 211 of the top surface of the base end 21 is aligned or substantially aligned with the outer edge 171 of the bottom surface of the fixed blade end 17. Preferably, the gap between the top surface of the base end 21 and the bottom surface of the fixed blade end 17 is less than 0.1 mm.

[0110] Since the bottom surfaces of the multiple side fixed cutter teeth 12 need to be ground flat as a whole to better ensure the sharpness of cutting when they cooperate with the side moving cutter teeth 41, the bottom surfaces of the side fixed cutter teeth 12 and the fixed cutter end 17 are coplanar with the bottom end plane 16, so that the bottom of the fixed cutter 1 can be ground on a whole plane, and at the same time, the bottom surfaces of the side fixed cutter teeth 12 and the bottom surfaces of the fixed cutter end 17 are flat, simplifying the processing technology of the fixed cutter.

[0111] Preferably, such as Figure 1 , 4 As shown in 5, 8, 10, 13, 21-23, 28, and 32, the base frame 2 includes a base body 20. The base end 21 protrudes upward above the base body 20, forming a space between the base body 20 and the fixed blade 1 to accommodate the moving blade 4 and allow the moving blade 4 to move left and right. The base frame 2 has a first welding part 23 located on the inner side of the base end 21. The bottom of the fixed blade 1 has a second welding part 18 that can be laser welded to the first welding part 23. The second welding part 18 is located on the inner side of the outer side of the fixed blade end 17. The base frame 2 has a laser through hole 24 that allows the first welding part 23 to protrude from the bottom of the base frame 2 so that the laser can enter and weld the first welding part 23 to the second welding part 18. The welding point of the first welding part 23 and the second welding part 18 is located on the inner side of the fixed blade 1 and the base frame 2, avoiding exposure to the skin and affecting the skin feel and damaging the appearance.

[0112] In a preferred embodiment, such as Figure 1 , 5 As shown in Figures 8, 10, 13, 25, and 32, the bottom of the fixed blade 1 is provided with upwardly recessed fixed blade positioning holes 19 on the inner sides of the left and right ends respectively. The fixed blade positioning holes 19 are located outside the middle mounting hole 13. The top of the base frame 2 is provided with a positioning post 23a that is inserted upward into the fixed blade positioning hole 19, so as to facilitate laser welding of the first welding part 23 and the second welding part 18 after the fixed blade 1 and the base frame 2 are positioned and installed.

[0113] Preferably, the sidewall of the positioning post 23a serves as the first welding part 23, and the outer side of the fixed blade positioning hole 19 serves as the second welding part 18. This design is simple and facilitates a secure connection of the welded fixed blade 1 to the base frame 2. In one embodiment, as... Figure 10 As shown, the positioning post 23a is integrally formed with the base frame 2, resulting in a simple structure and fewer parts; in another embodiment, as... Figure 25 As shown, the positioning post 23a is an independent component. Its upper end is inserted into the positioning hole 19 of the fixed knife and welded to the fixed knife 1. Its lower end is bent to the side and pressed onto the base frame 2 from bottom to top to fix the fixed knife 1 and the base frame 2 together.

[0114] The moving blade 4 has concave relief grooves 42 at its left and right ends respectively. In the left and right direction, the positioning post 23a is set in accordance with the relief grooves 42, which helps to shorten the length of the fixed blade 1 in the left and right direction while ensuring the cutting range of the side fixed blade tooth 12 and the side moving blade tooth 41 in the left and right direction. In the left and right direction, it helps to reduce the ineffective cutting area outside the side fixed blade tooth 12.

[0115] In another preferred embodiment, such as Figure 21-23 In the embodiment shown, the top surface of the uppermost end of the base frame 2 is the top surface of the base end 21, and the first welding part 23 is coplanar with the top surface of the base end 21; the second welding part 18 is a platform, and its bottom surface is coplanar with the bottom plane 16. The first welding part 23 and the second welding part 18 are welded together and fixed. When the fixed blade 1 and the base frame 2 are welded and fixed, they are positioned by aligning the outer side surfaces of the base end 21 and the fixed blade end 17, which helps to simplify the manufacturing process of the base frame 2 and the fixed blade 1.

[0116] In another preferred embodiment, such as Figure 29 and 32 In the illustrated embodiment, the base frame 2 has integrally formed suspension grooves 25a at the bottom of both left and right ends. The left and / or right side walls of the suspension grooves 25a are provided with shaft holes 26a, and the laser through hole 24 is located at the top of the suspension grooves 25a. Figures 37-39 As shown, the suspension groove 25a is used to insert the support arm 91 on the cutter head holder 9 to block the welding position from below, and the shaft hole 26a is used to install a pin to rotatably connect the support arm 91 to the suspension groove 25a.

[0117] In the embodiment where the intermediate blade mesh 3 is fixed on the fixed blade, the bottom of the fixed blade body 11 is provided with a blade mesh fixing part 15 outside the middle mounting hole 13. The blade mesh fixing part 15 communicates with the middle mounting hole 13, and the intermediate blade mesh 3 is fixed on the blade mesh fixing part 15.

[0118] like Figure 5-6In the embodiments shown in 8-9b, 11-12, and 16-17, the central mounting hole 13 is a rectangular hole, with its length direction along the left-right direction of the fixed blade body 11. The blade mesh fixing part 15 is an inwardly sloping downward slope on the front and rear side walls of the central mounting hole 13. In the front-rear direction, the width of the intermediate blade mesh 3 is greater than the width of the central mounting hole 13, and the front and rear sides of the intermediate blade mesh 3 are attached to the slope and form a continuous arc-shaped structure that convexes upward from the central mounting hole 13. The structure is simple and facilitates the arching of the intermediate blade mesh 3 to form an arc-shaped or near-arc-shaped structure, so as to better fit with the intermediate blade 51 below to cut hair and avoid uneven cutting and hair pulling. Moreover, through the blade mesh fixing part 15 and the arc-shaped intermediate blade mesh 3, it is convenient for the front and rear sides of the intermediate blade mesh 3 to be laser welded to the blade mesh fixing part 15. Figure 8 As shown, since the blade fixing part 15 is located inside the central mounting hole 13, the solder joint 15c is prevented from being exposed; another feature is that the area below the central blade 3 corresponding to the central mounting hole 13 is left unopened, so that the central blade can cover a wider area and increase the effective cutting area. Furthermore, the fixed blade body 11 is provided with a blade positioning part 15a protruding below the blade fixing part 15, and the central blade 3 is provided with a blade positioning hole 31 that cooperates with the blade positioning part 15a.

[0119] Preferably, such as Figure 6 As shown, the inclined surface of the blade fixing part 15 is inclined at an angle b ≥ 40° relative to the vertical direction f. When the inscribed circle r formed by the front and rear blade fixing parts 15 is located above the middle of the corresponding blade fixing part 15 at the point of tangency between the inscribed circle r and the front and rear blade fixing parts 15, the inscribed circle r is lower than the top surface of the arched part 14. This facilitates the upward arching of the middle blade 3 on both sides of the blade fixing part 15, ensuring that the middle blade 3 is lower than the top surface of the arched part 14. Figures 9a-9b As shown, this avoids the left and right ends of the middle blade mesh 3 from being exposed and irritating the skin, and also avoids the curvature of the middle blade mesh 3 being too large, so that the middle blade mesh can better form an arc structure.

[0120] Of course, it can also be like Figure 20 , 27 In the embodiment shown in -33, the intermediate shaving mesh 3 is not a continuous arc-shaped structure. The intermediate shaving mesh 3 includes a mesh top 30 and a surrounding edge 33 that bends downward from the mesh top 30. The mesh top 30 protrudes upward from the central mounting hole 13, and the lower edge of the surrounding edge 33 is lower than the upper edge of the central mounting hole 13. Dividing the intermediate shaving mesh 3 into a mesh top 30 and a surrounding edge 33 structure facilitates the mesh top 30 to protrude upward from the central mounting hole 13 and contact the skin for a clean shave, while the lower edge of the surrounding edge 33 is covered below the upper edge of the central mounting hole 13 to avoid contact with the skin and affect the skin feel.

[0121] like Figure 40 As shown, the side edge 33 that bends downwards from the top of the net 30 refers to the side portion that bends downwards from the tangent T of the top of the net 30. "Significantly deviated" means that the angle θ of the side edge relative to the tangent T of the top of the net 30 is greater than 30°. There is a bend and chamfer transition between the top of the net 30 and the side edge 33. Preferably, the curvature of the top of the net 30 is the same or substantially the same.

[0122] Preferably, the edging 33 is provided around the outside of the top of the net 30, and the edging 33 at the left and right ends and the edging 33 at the front and back ends are transitioned by rounded corners to avoid skin irritation around the top of the net 30, so that the top of the net 30 can protrude above the arched part 14. Preferably, when viewed in the front-back direction, the top of the net 30 protrudes upward in an arc shape corresponding to the arched part 14, and the top of the net 30 is level with or slightly higher than the top surface of the arched part 14 from front to back, which facilitates better contact between the entire top of the net 30 and the skin. Here, level means that the height difference is very small, within the range of -0.15mm to 0.15mm, the skin is soft, and the height difference within the range of 0.15mm has a low impact on the skin feel; slightly higher means that the height difference does not exceed 0.4mm, and a height difference exceeding 0.4mm forms a noticeable step, reducing the skin feel.

[0123] The central mounting hole 13 includes four hole walls: front, back, left, and right. The left and right hole walls are arc-shaped structures with their concave sides facing the inside of the central mounting hole 13. The left and right hole walls and the front and back hole walls are connected by inner rounded corners 132. The surrounding edges 33 at the left and right ends protrude outwards in an arc-shaped structure corresponding to the left and right hole walls of the central mounting hole 13, which is conducive to using thin metal sheets to stamp and form the mesh top 30 and the surrounding edges 33.

[0124] The surrounding edge 33 is provided with an outwardly bent flange 34. The outwardly bent flange 34 overlaps the blade mesh fixing part 15 from bottom to top and is welded to the blade mesh fixing part 15. The structure is simple and easy to weld, which avoids gaps below the top of the mesh 30, so that the middle blade can cover a wider area and increase the effective cutting area. Of course, in addition to welding, the outwardly bent flange can also be fixed to the blade mesh fixing part 15 by glue or other methods.

[0125] Preferably, the blade fixing part 15 is recessed upward from the bottom of the fixed blade body. The blade fixing part 15 consists of several grooves respectively provided on the front and rear sides of the central mounting hole 13. The outer flange 34 is welded and fixed in the groove. The structure is simple and facilitates the powder metallurgy forming of the fixed blade.

[0126] In the embodiment where the intermediate blade 3 is installed vertically within the central mounting hole 13, such as... Figure 18-19In the embodiment shown, the intermediate blade mesh 3 is provided with anti-detachment holes 32, and the fixed blade body 11 is provided with anti-detachment posts 15b extending downwards. The anti-detachment posts 15b are inserted into the anti-detachment holes 32. The front and rear sides of the intermediate blade mesh 3 are movably installed in the central mounting holes 13. The anti-detachment posts 15b extend to the position of the moving blade 4 to prevent the intermediate blade mesh 3 from detaching from below the anti-detachment posts 15b.

[0127] Preferably, the head of the side-fixing blade 12 is provided with a thickening head 124. The thickening head 124 is larger than the tooth body of the side-fixing blade 12 near the thickening head 124, thereby improving the feel at the tip of the side-fixing blade 12. The thickening head 124 being larger than the tooth body of the side-fixing blade 12 near the thickening head 124 refers to being larger only in the height direction, or larger in both the height and width directions. Preferably, the thickening head 124 is formed by laser sintering at the outer end of the side-fixing blade 12. The side-fixing blade 12 has a large root width that gradually decreases towards the tip, and a large root thickness that gradually decreases towards the tip. This allows the side-fixing blade 12 to be made smaller while maintaining structural strength, improving its efficiency in combing and cutting long hairs and shortening the length of the hair root after cutting. Of course, it can also be... Figure 9b As shown, the thickness of the side-fixing teeth 12 is consistent or substantially consistent from the root to the tip. The thickening head 124 on the head of the entire row of side-fixing teeth 12 increases the skin feel of the hair cutting assembly on the side with the side-fixing teeth 12, that is, the front and / or rear side of the hair cutting assembly.

[0128] A drive device 6 is provided between the fixed blade 1 and the base frame 2 to drive the moving blade 4 and the intermediate blade assembly 5 to reciprocate left and right. A support device is provided below the moving blade 4 and the intermediate blade assembly 5 to support the moving blade 4 and the intermediate blade assembly 5 upward. The intermediate blade 51 is mounted on the intermediate bracket 52.

[0129] As one implementation of the drive device 6, such as Figure 1 , 4 As shown in Figures 10 and 11, the drive device 6 includes a drive connection structure 61 for connecting to an external drive device 90, and a tool connector 62. The tool connector 62 is fixed below the moving tool 4. The drive connection structure 61 is connected to the tool connector 62 and moves left and right together with the tool connector 62 and the moving tool 4 when the drive connection structure 61 moves left and right. The intermediate support 52 is provided with a toggle hole 521. The tool connector 62 is provided with a toggle rod 624 inserted into the toggle hole 521 for moving the intermediate support 52 left and right together when the tool connector 62 moves left and right. The toggle rod 624 cooperates with the toggle hole 521 to allow the intermediate tool assembly 5 to float up and down relative to the toggle rod 624.

[0130] Preferably, such as Figure 1 , 10 As shown in Figure 23, the tool connector 62 includes a crossbar 621. The bottom of the crossbar 621 is provided with a downward-facing drive connection part 622 for connecting to the drive connection structure 61. Both ends of the crossbar 621 are provided with upward-facing uprights 623 for fixing to the moving tool 4. The lower end of the actuating rod 624 is fixed to the middle of the crossbar 621. The upper part of the actuating rod 624 is provided with an arc surface 625 that protrudes to the left and right sides and spans from top to bottom. The left and right side walls of the actuating hole 521 are provided with straight walls 522 that are stretched vertically. The arc surface 625 and the straight wall 522 cooperate to allow the intermediate support 52 to be fitted on the actuating rod 624 and move up and down, and allow the intermediate support 52 to rotate up and down around the arc surface 625. The structure is simple and the size is small.

[0131] Preferably, such as Figure 12-13 As shown, the base frame 2 has a movable groove 27 on its middle section, running from left to right, for the tool connector 62 to move left and right. The bottom of the intermediate support 52 has a slider 523 inserted into the movable groove 27. The slider 523 slides in conjunction with the movable groove 27, allowing the intermediate support 52 to slide left and right. The slider 523 has a limiting groove 524 for the tool connector 62 to engage and restrict its forward and backward movement. This design is simple and allows the moving blade and intermediate blade assembly 5 to reciprocate better in the left and right directions during operation, while also reducing the height of the hair cutting assembly in the vertical direction. The base frame 2 has first welding portions 23 at both ends of the movable groove 27. The left and right ends of the movable groove 27 extend downwards through the base frame 2, forming laser through holes 24 for the first welding portions 23 to protrude from below and for the laser to pass through. This design is also simple.

[0132] As another implementation of the drive device 6, such as Figure 28 , 29 As shown in Figures 32 and 33, the driving device 6 includes a driving connection structure 61 disposed on the intermediate support 52. The intermediate support 52 is connected to the moving blade 4 and moves with the moving blade 4 when moving left and right. The intermediate support 52 is slidably connected to the base frame 2 left and right, and the structure is simple.

[0133] Preferably, the drive connection structure 61 is integrally formed with the intermediate support 52. The drive connection structure 61 is provided with a drive connection groove 61a for connecting with the external drive device 90. The base frame 2 is integrally formed with a suspension groove 25a at the bottom of the left and right ends. The left side wall and / or right side wall of the suspension groove 25a are provided with a shaft hole 26a. The center line OA of the shaft hole 26a passes through the drive connection groove 61a. When the base frame 2 is rotatably connected to the cutter head holder 9 through the shaft hole 26a and the pin, the center line OA is the rotation center of the base frame 2 on the cutter head holder 9. The rotation center passing through the drive connection groove 61a helps to reduce the activity space required for the external drive device 90 to rotate in the drive connection groove 61a.

[0134] As another embodiment that is rotatably connected to the cutter head holder 9, such as Figure 10 As shown, the bottom of the base frame 2 is integrally formed with a downwardly extending rotating connection part 25, and the rotating connection part 25 is provided with a rotating connection hole 26.

[0135] In order to achieve synchronous left and right reciprocating motion of the moving blade 4 and the intermediate support 52, one of the moving blade 4 and the intermediate support 52 is provided with a drive hole 45 and the other is provided with a drive column 525. The intermediate support 52 and the moving blade 4 are connected by the drive column 525 and the drive hole 45, so that the intermediate support 52 can move up and down relative to the moving blade 4.

[0136] Preferably, such as Figure 1 , 14 As shown in Figures 15 and 29, the moving blade 4 has a moving blade hole 43 in the middle to accommodate the intermediate blade assembly 5. The moving blade 4 is a sheet-like structure. The intermediate blade assembly 5 passes through and is located inside the moving blade hole 43. The left and right ends of the moving blade hole 43 are respectively provided with outwardly extending holes 431 on the front and rear sides. An inner connecting plate 44 is formed between the front and rear extension holes 431 at each end. The intermediate support 52 is located between the left and right inner connecting plates 44. The intermediate blade 51 is an inverted U-shaped structure formed by bending a metal plate. The left and right ends of the intermediate blade 51 extend outward beyond the left and right ends of the intermediate support 52, and the sidewalls on the left and right ends of the intermediate blade 51 are inserted into the extension holes 431. This is to reduce the volume of the structure composed of the moving blade 4 and the intermediate blade assembly 5, especially the height in the vertical direction, and at the same time make the intermediate blade 51 have a longer length in the horizontal direction, so that the cutting area covered by the intermediate blade 51 when it moves left and right is wider, and the ineffective cutting area of ​​the intermediate blade mesh 3 in the horizontal direction is reduced.

[0137] Preferably, the clearance groove 42 of the moving blade 4 is correspondingly disposed on the outer side of the inner connecting plate 44, so that the extension hole 431 can extend to the left and right sides to a greater extent, so that the length of the middle blade 51 can be longer.

[0138] The support device includes a first elastic structure 71 that acts on the intermediate support 52 to elastically press the intermediate blade 51 upward against the bottom of the intermediate blade net 3, and a moving blade support structure for supporting the moving blade 4 from below. The moving blade support structure is located on the outside of the intermediate blade assembly 5, which facilitates the support position to be close to the side moving blade teeth 41, so as to improve the sharpness of the cutting when the side moving blade teeth 41 and the side fixed blade teeth 12 cooperate.

[0139] As a preferred embodiment of the moving blade support structure, such as Figure 1 , 10 As shown in -13, 23, and 29, the moving blade support structure is a second elastic structure 72 that elastically presses the moving blade 4 upward, allowing the side moving blade tooth 41 to better fit against the bottom of the side fixed blade tooth 12. Preferably, the first elastic structure 71 and the second elastic structure 72 are spring sheets, which helps to reduce the vertical height of the first elastic structure 71 and the second elastic structure 72, and the first elastic structure 71 and the second elastic structure 72 are integrally formed, which facilitates installation and fixation; in particular, as Figure 29 In the illustrated embodiment, all the first elastic structures 71 and all the second elastic structures 72 are integrally formed. The first elastic structure 71 and the second elastic structure 72 are spring sheets.

[0140] As another preferred embodiment of the moving blade support structure, such as Figure 16 As shown, the moving knife support structure includes a support bar 28 arranged on the base body 20 in the left and right direction. The support bar 28 supports the side moving knife tooth 41 from below and below the side fixed knife tooth 12. The structure is simple. A narrow gap is formed between the support bar 28 and the fixed knife to allow the sheet-like moving knife 4 to move inside, so that the moving knife can be made thin to reduce the volume while avoiding the moving knife from deforming downward.

[0141] As a third preferred embodiment of the moving blade support structure, such as Figure 17 As shown, the moving blade support structure includes a ball bearing 8 that can roll on the base body 20. The ball bearing 8 supports the side moving blade tooth 41 from below and under the side fixed blade tooth 12 to reduce the moving friction when the moving blade 4 moves. Furthermore, the moving blade support structure also includes a support bar 28 arranged on the base body 20 in the left-right direction.

[0142] Preferably, the base frame 2 is formed by powder metallurgy. One or more of the base end 21, the first welding part 23, the laser through hole 24, the movable groove 27, the suspension groove 25a, and the shaft hole 26a are integrally formed by injection molding of the base frame 2, which has a simple structure and is easy to process.

[0143] like Figure 34As shown, there may be two or more central mounting holes 13 on the fixed blade 1. Correspondingly, a central blade mesh 3 and a central blade assembly 5 are provided in each central mounting hole 13 to increase the area of ​​the shaving area inside the side fixed blade teeth 12 and improve shaving efficiency.

[0144] The fixed blade 1 is fixed on the base frame 2. The combination of the base frame and the fixed blade forms the support and mounting structure of the hair cutting assembly. It is used to install the intermediate blade net, moving blade, intermediate blade assembly, support device and drive device. The top and side surfaces of the assembly have a good skin feel and can be directly used as the outer surface that contacts the skin. The base frame is provided with a blade mounting structure such as a hanging groove 25a or a rotating connection part 25 to connect with the blade holder 9. The structure is simple and helps to reduce the size of the hair cutting assembly.

[0145] The powder metallurgical forming process for the fixed blade and base frame includes injecting metal-containing powder into a mold on an injection molding machine to form blanks of the fixed blade and base frame. The blanks are then degreased and sintered to obtain the metal fixed blade and base frame, which are then heat-treated for hardening. The bottom surface of the fixed blade can be further ground to create a flat bottom end plane 16 and the bottom surface of the side fixed blade teeth 12.

[0146] During normal use, only the top and sides of this hair cutting component come into contact with the skin. The top provides a good skin feel through the combination of the fixed blade and the central blade mesh, while the left and right ends provide a good skin feel through the combination of the fixed blade and the base. The front and rear ends provide a good skin feel by setting thickening heads on the side fixed blade teeth. This makes the hair cutting component provide a good skin feel when shaving different parts of the body, providing user comfort.

[0147] The hair cutting component described above has a large cutting area, a small size, and provides a better shaving feel.

[0148] A method for manufacturing a hair cutting component includes the following steps:

[0149] A. Manufacturing fixed tool 1, base frame 2, intermediate tool holder 3, moving tool 4, intermediate tool assembly 5, among which

[0150] The fixed blade 1 is manufactured by powder metallurgy molding process. Its front and / or rear sides are integrally injection molded with multiple side fixed blade teeth 12. The left and right sides of the side fixed blade teeth 12 are respectively equipped with sharp-angle fixed blade edges 121. The top of the fixed blade 1 is integrally formed with an arched part 14 that is low on the front and rear sides and high in the middle, and a central mounting hole 13 that penetrates the arched part 14 from top to bottom. A blade net fixing part 15 that communicates with the central mounting hole 13 is formed at the bottom of the fixed blade 1.

[0151] The middle blade mesh 3 is made of stainless steel sheet. The four sides of the middle blade mesh 3 are bent downward to form a structure with a mesh top 30 and four surrounding edges 33. The outer flange 34 is formed by bending outward from the bottom of the surrounding edges 33.

[0152] The moving blade 4 is manufactured by etching process to produce side moving blade teeth 41. The angle β formed between the side and top surfaces of the moving blades 411 on the left and right sides of the side moving blade teeth 41 is ≤50°.

[0153] B. Insert the middle blade 3 into the central mounting hole 13, and attach the outer flange 34 to the blade fixing from bottom to top.

[0154] The fixed part 15 is welded or bonded to it;

[0155] C. First, install the moving blade 4 and the intermediate blade assembly 5 on the base frame 2. Then, install the fixed blade 1 from top to bottom on the base frame 2 so that the side fixed blade teeth 12 and the side moving blade teeth 41 are opposite each other. The intermediate blade assembly 5 is installed in the intermediate blade net 3. Fix the fixed blade 1 to the base frame 2 so that the moving blade 4 and the intermediate blade assembly 5 are limited between the fixed blade 1 and the base frame 2.

[0156] In step C, when the support device is the first elastic structure 71 and the moving blade support structure, before installing the moving blade 4 and the intermediate component 5, the support device is first installed on the base frame 2, and then the moving blade 4 and the intermediate component 5 are installed downwards on the support device.

[0157] In a preferred embodiment, in step A, a tool connector 62 is fixed below the movable blade 4. The movable blade 4 has a movable blade hole 43 in the middle. The tool connector 62 has an upward-facing actuating rod 624. The intermediate blade assembly 5 includes an intermediate blade 51 and an intermediate support 52. The bottom of the intermediate support 52 has an actuating hole 521. In step C, when installing the movable blade 4 and the intermediate blade assembly 5, the intermediate blade 51 is first installed on the intermediate support 52 to assemble the intermediate blade assembly 5. Then, the intermediate blade assembly 5 is inserted into the movable blade hole 43, and the actuating rod 624 is inserted into the actuating hole 521. Preferably, in step C, after the movable blade 4 is installed, a drive connection structure 61 is connected from the lower part of the tool connector for connection with an external drive.

[0158] In another preferred embodiment, in the vertical direction, between the moving blade 4 and the intermediate support 52, one of them is provided with a drive hole 45 and the other is provided with a drive post 525. In step C, when installing the moving blade 4 and the intermediate blade assembly 5, the intermediate blade assembly 5 is mounted on the moving blade 4 and the drive post 525 is inserted into the drive hole 45.

[0159] The hair cutting component is simple and easy to assemble.

Claims

1. A hair cutting component, characterized in that: The device includes a fixed blade (1) and a base frame (2). The fixed blade (1) is fixed on the base frame (2). The fixed blade (1) includes a fixed blade body (11). The front and / or rear sides of the fixed blade body (11) are provided with a plurality of side fixed blade teeth (12) arranged in the left-right direction. The top surfaces of the fixed blade body (11) and the side fixed blade teeth (12) serve as skin contact surfaces (10). Below the fixed blade (1) is a movable blade (4) that can move left and right. The movable blade (4) is provided with a side movable blade tooth (41) located below the side fixed blade teeth (12). The side movable blade tooth (41) is located inside the head of the side fixed blade tooth (12). The left and right sides each have a sharp-angled moving blade (411). The middle part of the fixed blade (1) is located inside the side fixed blade teeth (12) and has a middle mounting hole (13). Between the base frame (2) and the fixed blade (1), there is an intermediate blade net (3) that protrudes upward from the middle mounting hole (13). The material thickness of the intermediate blade net (3) is between 0.04mm and 0.15mm. The thickness of the side fixed blade teeth (12) is greater than the thickness of the intermediate blade net (3). The intermediate blade assembly (5) is provided below the intermediate blade net (3). The intermediate blade assembly (5) includes an intermediate blade (51) that can move left and right against the bottom of the intermediate blade net (3).

2. The hair cutting component according to claim 1, characterized in that: The moving blade (411) has an angle β ≤ 50° between its side surface and top surface at the cutting edge position, and the side moving blade tooth (41) is formed by etching to form two arc-shaped side surfaces.

3. The hair cutting component according to claim 1, characterized in that: The fixed blade (1) is rigid. The top of the fixed blade body (11) is low on the front and rear sides and gradually increases towards the middle to form an arched part (14). The middle mounting hole (13) passes through the arched part (14) vertically and is located on the inner side of the left and right ends of the arched part (14). The middle blade net (3) protrudes upward from the middle mounting hole (13) above the front and rear sides of the fixed blade body (11) corresponding to the arched part (14).

4. A hair cutting component according to claim 3, characterized in that: The bottom of the fixed blade body (11) is provided with a blade net fixing part (15) outside the middle mounting hole (13). The blade net fixing part (15) communicates with the middle mounting hole (13), and the middle blade net (3) is fixed on the blade net fixing part (15).

5. A hair cutting component according to claim 4, characterized in that: The central mounting hole (13) is a rectangular hole, the length of which is along the left and right direction of the fixed blade body (11). The blade net fixing part (15) is an inwardly inclined downward slope on the front and rear side walls of the central mounting hole (13). In the front and rear direction, the width of the middle blade net (3) is greater than the width of the central mounting hole (13), and the front and rear sides of the middle blade net (3) are attached to the inclined surface and form a continuous arc-shaped structure that convexes upward from the central mounting hole (13).

6. A hair cutting component according to claim 4, characterized in that: The intermediate knife mesh (3) includes a mesh top (30) and a surrounding edge (33) that bends downward from the mesh top (30). The mesh top (30) protrudes upward from the central mounting hole (13), and the lower edge of the surrounding edge (33) is lower than the upper edge of the central mounting hole (13).

7. A hair cutting component according to claim 6, characterized in that: The edging (33) is provided around the outside of the top of the net (30). The edging (33) at the left and right ends and the edging (33) at the front and back ends are connected by rounded corners. When viewed from the front and back, the top of the net (30) protrudes upward into an arc shape corresponding to the arched part (14), and the top of the net (30) is level with or slightly higher than the top surface of the arched part (14) from front to back.

8. A hair cutting component according to claim 6, characterized in that: The surrounding edge (33) is provided with an outwardly bent flange (34), which is placed on the blade net fixing part (15) from bottom to top and fixed to the blade net fixing part (15).

9. A hair cutting component according to claim 3, characterized in that: The top surface of the arched part (14) is part of the top surface of the fixed blade body (11). The top surface of the arched part (14) intersects with the side end faces (172) at the left and right ends of the fixed blade body (11) and the two are smoothly connected. The side end face (172) at each end protrudes outward to form an arc-shaped structure. The intersection line of the top surface of the fixed blade body (11) and the side end face (172) is a three-dimensional spatial curve.

10. A hair cutting component according to any one of claims 1 to 9, characterized in that: The base frame (2) includes base ends (21) located at the left and right ends, corresponding to the side fixed blade teeth (12) on each side. A recessed clearance groove (22) is provided between the left and right base ends (21) from the front and / or rear side of the base frame (2). The recessed clearance groove (22) allows the side fixed blade teeth (12) to protrude from below the base frame (2) and be suspended outside the base frame (2). The left and right ends of the fixed blade body (11) are respectively provided with fixed blade ends (17) located outside the multiple side fixed blade teeth (12). The fixed blade ends (17) have smooth outer surfaces, and the outer surfaces of the fixed blade ends (17) smoothly transition with the top surface. The outer surfaces of the fixed blade ends (17) form a U-shaped or C-shaped structure from front to back. The corresponding outer surfaces of the base ends (21) are U-shaped or C-shaped structures. The outer surfaces of the base ends (21) and the fixed blade ends (17) are aligned or substantially aligned.

11. A hair cutting component according to claim 10, characterized in that: The base frame (2) includes a base frame body (20). The base end (21) protrudes upward above the base frame body (20) to form a space between the base frame body (20) and the fixed blade (1) to accommodate the moving blade (4) and allow the moving blade (4) to move left and right. The base frame (2) is provided with a first welding part (23) on the inner side of the base end (21). The bottom of the fixed blade (1) is provided with a second welding part (18) that can be laser welded to the first welding part (23). The second welding part (18) is located on the inner side of the outer side of the fixed blade end (17). The base frame (2) is provided with a laser through hole (24) for the first welding part (23) to protrude from the bottom of the base frame (2) so that the laser can enter and weld the first welding part (23) to the second welding part (18).

12. A hair cutting component according to claim 11, characterized in that: The bottom of the fixed blade (1) has upwardly recessed fixed blade positioning holes (19) on the inner sides of the left and right ends respectively. The fixed blade positioning holes (19) are located outside the middle mounting hole (13). The top of the base frame (2) has a positioning post (23a) that is inserted upward into the fixed blade positioning hole (19). The side wall of the positioning post (23a) serves as the first welding part (23), and the outer side of the fixed blade positioning hole (19) serves as the second welding part (18).

13. A hair cutting component according to claim 11, characterized in that: The base frame (2) has a suspension groove (25a) integrally formed at the bottom of the left and right ends. The left side wall and / or right side wall of the suspension groove (25a) are provided with shaft holes (26a). The laser through hole (24) is located at the top of the suspension groove (25a).

14. A hair cutting component according to any one of claims 1-9 or 11-13, characterized in that: A drive device (6) for driving the moving blade (4) and the intermediate blade assembly (5) to reciprocate left and right is provided between the fixed blade (1) and the base frame (2). A support device for supporting the moving blade (4) and the intermediate blade assembly (5) upward is provided below the moving blade (4) and the intermediate blade assembly (5).

15. A hair cutting component according to claim 14, characterized in that: The intermediate blade (51) is mounted and fixed by the intermediate bracket (52). The driving device (6) includes a driving connection structure (61) provided on the intermediate bracket (52). The intermediate bracket (52) is connected to the moving blade (4) and moves with the moving blade (4) when moving left and right.

16. A hair cutting component according to claim 15, characterized in that: The drive connection structure (61) is integrally formed with the intermediate bracket (52). The drive connection structure (61) is provided with a drive connection groove (61a) for connecting with an external drive device. The base frame (2) is integrally formed with a suspension groove (25a) at the bottom of the left and right ends. The left side wall and / or right side wall of the suspension groove (25a) are provided with a shaft hole (26a). The center line of the shaft hole (26a) passes through the drive connection groove (61a).

17. A hair cutting component according to claim 15, characterized in that: Between the moving blade (4) and the intermediate support (52), one of them is provided with a drive hole (45) and the other is provided with a drive column (525). The intermediate support (52) and the moving blade (4) are connected by the drive column (525) and the drive hole (45) to enable the intermediate support (52) to move up and down relative to the moving blade (4).

18. A hair cutting component according to claim 14, characterized in that: The drive device (6) includes a drive connection structure (61) for connecting to an external drive device and a tool connector (62). The tool connector (62) is fixed below the moving tool (4). The drive connection structure (61) is connected to the tool connector (62) and moves left and right together with the tool connector (62) and the moving tool (4) when the drive connection structure (61) moves left and right. The intermediate tool (51) is installed and fixed by an intermediate bracket (52). The intermediate bracket (52) is provided with a toggle hole (521). The tool connector (62) is provided with a toggle rod (624) inserted into the toggle hole (521) for moving the intermediate bracket (52) left and right together when the tool connector (62) moves left and right. The toggle rod (624) cooperates with the toggle hole (521) so that the intermediate tool assembly (5) can float up and down relative to the toggle rod (624).

19. A hair cutting component according to claim 18, characterized in that: The base frame (2) has a movable groove (27) on the middle part, which moves left and right to allow the tool connector (62) to move left and right. The bottom of the intermediate support (52) has a slider (523) inserted into the movable groove (27). The slider (523) slides with the movable groove (27) to allow the intermediate support (52) to slide in the left and right direction. The slider (523) has a limiting groove (524) on it for the tool connector (62) to be inserted and to restrict the forward and backward movement of the tool connector (62).

20. A hair cutting component according to claim 14, characterized in that: The intermediate blade (51) is installed and fixed by the intermediate bracket (52). The middle part of the moving blade (4) is provided with a moving blade hole (43) to accommodate the intermediate blade assembly (5). The moving blade (4) is a sheet-like structure. The intermediate blade assembly (5) passes through and is located in the moving blade hole (43). The left and right ends of the moving blade hole (43) are respectively provided with extension holes (431) extending outward on the front and rear sides. An inner connecting plate (44) is formed between the front and rear extension holes (431) at each end. The intermediate bracket (52) is located between the two inner connecting plates (44). The intermediate blade (51) is an inverted U-shaped structure. The left and right ends of the intermediate blade (51) extend outward beyond the left and right ends of the intermediate bracket (52), and the sidewalls on the left and right ends of the intermediate blade (51) are inserted into the extension holes (431).

21. A hair cutting component according to claim 14, characterized in that: The intermediate blade (51) is installed and fixed by the intermediate bracket (52). The support device includes a first elastic structure (71) that acts on the intermediate bracket (52) to elastically press the intermediate blade (51) upward against the bottom of the intermediate blade net (3), and a moving blade support structure for supporting the moving blade (4) from below. The moving blade support structure includes a support bar (28) arranged on the base frame (2) in the left-right direction and / or a ball bearing (8) that can roll on the base frame (2). Alternatively, the moving blade support structure is a second elastic structure (72) that elastically presses the moving blade (4) upward. The second elastic structure (72) and the first elastic structure (71) are integrally formed.

22. A hair cutting component according to claim 1, characterized in that: The head of the side-fixed cutter tooth (12) is provided with a thickening head (124), which is larger than the tooth body of the side-fixed cutter tooth (12) near the thickening head (124).

23. A hair cutting component according to any one of claims 1-9, 11-13 or 15-22, characterized in that: The fixed blade body (11) is formed by powder metallurgy, and the side fixed blade teeth (12) are integrally injection molded with the fixed blade body (11).

24. A method for manufacturing a hair cutting component, comprising the following steps: A. Manufacturing the fixed tool (1), base frame (2), intermediate tool net (3), moving tool (4), and intermediate tool assembly (5), among which The fixed blade (1) is manufactured by powder metallurgy forming process. Its front and / or rear sides are integrally injection molded with multiple side fixed blade teeth (12). The left and right sides of the side fixed blade teeth (12) are respectively equipped with sharp-angle fixed blade edges (121). The top of the fixed blade (1) is integrally formed with an arched part (14) that is low on the front and rear sides and high in the middle, and a middle mounting hole (13) that runs through the arched part (14) from top to bottom. A blade net fixing part (15) that communicates with the middle mounting hole (13) is formed at the bottom of the fixed blade (1). The middle blade mesh (3) is made of stainless steel sheet. The four sides of the middle blade mesh (3) are bent downward to form a structure with a mesh top (30) and four surrounding edges (33). The outer flange (34) is formed by bending the bottom of the edge (33) outward. The moving blade (4) is manufactured by etching process to produce side moving blade teeth (41). The moving blades (411) on the left and right sides of the side moving blade teeth (41) have an angle β≤50° between the side and the top surface at the cutting edge position. B. Insert the middle blade mesh (3) into the middle mounting hole (13), and attach the outer flange (34) from bottom to top to the blade mesh fixing part (15) and weld or glue it in place. C. First, install the moving blade (4) and the intermediate blade assembly (5) on the base frame (2), and then install the fixed blade (1) from top to bottom on the base frame (2) so that the side fixed blade teeth (12) and the side moving blade teeth (41) are opposite each other. The intermediate blade assembly (5) is installed in the intermediate blade net (3). Fix the fixed blade (1) to the base frame (2) so that the moving blade (4) and the intermediate blade assembly (5) are limited between the fixed blade (1) and the base frame (2).

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