Hair cutting assembly

Abstract

The invention discloses a hair cutting assembly, which comprises a rigid stationary knife and a base, the stationary knife is fixed on the base, a plurality of side stationary knife teeth are arranged on a stationary knife body, the top surfaces of the stationary knife body and the side stationary knife teeth are used as skin contact surfaces, the left side and the right side of each side stationary knife tooth are respectively provided with a first knife edge with an acute angle; a movable cutter capable of moving left and right is arranged below the fixed cutter, side movable cutter teeth located below the side fixed cutter teeth are arranged on the movable cutter, second cutting edges with acute angles are arranged on the left side and the right side of the side movable cutter teeth respectively, and 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 which is exposed upwards from the middle mounting hole is arranged between the base and the fixed cutter, and a middle cutter assembly is arranged below the middle cutter net. The hair cutting assembly has the advantages of being sharp in cutting, good in safety, small in size and comfortable in skin feeling.

Description

Technical field

[0001] The present invention relates to a hair cutting assembly. [Background Technology]

[0002] The shavers currently on the market, such as announcement number CN308103438S, named hair trimming scissor head (N19), such as announcement number CN300736959D, named women's shaver (ML-258), such as announcement number CN205660764U, named a razor head assembly, such as announcement number CN210414631U, named a razor head and other patents disclosed structures, the head generally consists of a side knife cutting near the edge and an intermediate knife net cutting two parts, the side knife cutting part is used to trim long hair, the intermediate knife net cutting part is used to shave clean, the side knife cutting part consists of side fixed knife teeth of the fixed knife and side movable knife teeth of the movable knife, wherein the side movable knife teeth on the movable knife are exposed at the top of the knife head, and the top of the knife head moves on the skin when shaving. When shaving, the side movable knife on the movable knife of the side knife cutting part The teeth are easy to contact the skin, which causes strong irritation to the skin and poor skin feel. In addition, in order to prevent the side-moving blades of the movable knife from cutting the skin, a blade head cover is usually installed above the movable knife, and a step is formed on the side above the side-moving blade through the blade head cover. The step is first pressed against the skin to lift the side-moving blade teeth, thereby reducing the contact degree between the side-moving blade teeth and the skin. This will inevitably leave longer hairs after the side knife cuts, and the longer hairs are not conducive to entering the mesh holes and being cut in the middle blade net, thereby reducing the shaving efficiency when shaving. At the same time, the shearing sharpness of the side-moving blade teeth and the side fixed blade teeth is not high. One is to ensure safety and avoid the exposed movable knife from cutting the skin, and the other is the structure of the side-moving blade teeth and the side fixed blade teeth themselves. Therefore, general razors are used to shave sparse hair areas such as hand hair and leg hair. As for shaving dense hair areas, it is easy to pull hair.

[0003] In addition, the side knife cutting and the middle knife net cutting parts are bulky when combined together, and a groove needs to be set on the main body of the shaver for the knife head to be installed, which makes the entire shaver relatively large. It is difficult to reduce the volume while maintaining the aesthetics, and the top has various steps that are uneven, which makes the skin feel bad when moving on the skin.

[0004] The present invention is 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 assembly which has the characteristics of sharp cutting, good safety, small size and comfortable skin feel.

[0006] To solve the above technical problems, the present invention provides a hair cutting assembly, comprising a rigid fixed blade and a base, the fixed blade being fixed to the base, the fixed blade comprising a fixed blade body, a plurality of side fixed blade teeth arranged in a left-right direction being provided on the front and / or rear sides of the fixed blade body, the top surfaces of the fixed blade body and the side fixed blade teeth serving as skin contact surfaces, the left and right sides of the side fixed blade teeth respectively having a first blade edge at an acute angle, a movable blade capable of left-right movement being provided below the fixed blade, the movable blade being provided with side movable blade teeth located below the side fixed blade teeth, the left and right sides of the side movable blade teeth respectively having a second blade edge at an acute angle, a central mounting hole being provided in the central portion of the fixed blade body, located inside the side fixed blade teeth, an intermediate blade net being provided between the base and the fixed blade, the intermediate blade net protruding upward from the central mounting hole, the material thickness of the intermediate blade net being between 0.04 mm and 0.15 mm, an intermediate blade assembly being provided below the intermediate blade net, the intermediate blade assembly comprising an intermediate blade capable of left-right movement attached to the bottom of the intermediate blade net.

[0007] In the hair cutting assembly described above, the fixed blade body is formed by powder metallurgy, the side fixed blade teeth and the fixed blade body are integrally injection-molded, the top of the fixed blade body is low on the front and rear sides, and gradually increases towards the middle to form a middle protrusion, and when viewed from the left and right directions, the top surface of the fixed blade body smoothly or substantially smoothly transitions from the top of the middle protrusion to the front and rear sides, the middle mounting hole divides the middle protrusion into left and right sections, and the middle blade net protrudes upward from the middle mounting hole corresponding to the middle protrusion above the front and rear sides of the fixed blade body.

[0008] In the hair cutting assembly described above, the central mounting hole is a rectangular hole, the length of which is along the left-right direction of the fixed blade body. Inclined surfaces facing inward and downward are provided on the front and rear side walls of the central mounting hole. In the front-to-back direction, the width of the middle blade net is greater than the width of the middle mounting hole, and the front and rear sides of the middle blade net are attached to the inclined surfaces to form a continuous arc structure that protrudes upward from the central mounting hole.

[0009] In the hair cutting assembly described above, the angle b of the inclined surface relative to the vertical direction f is ≥ 40°. When the inscribed circle formed by the front and rear inclined surfaces reaches a point of tangency above the center of the corresponding inclined surface, the inscribed circle is lower than the top surface of the middle protrusion. The front and rear sides of the middle blade net are laser welded to the inclined surface, and the middle blade net is lower than the top surface of the middle protrusion.

[0010] In the hair cutting assembly described above, the side fixed blade teeth have a large root width that gradually decreases toward the end, and a large root thickness that gradually decreases toward the end. The lowermost end of the fixed blade body has a bottom end plane, and the bottom surface of the side fixed blade teeth is coplanar with the bottom end plane. The head of the side fixed blade teeth is provided with a thickening head, and the thickening head is larger than the tooth body of the side fixed blade teeth adjacent to the thickening head. The thickening head protrudes downward below the bottom end plane.

[0011] The hair cutting assembly as described above comprises base ends located at left and right ends, corresponding to the side fixed blade teeth on each side, and an escape groove recessed from the front and / or rear sides of the base is provided between the left and right base ends, the escape groove allowing the side fixed blade teeth to be exposed from below the base and suspended outside the base, and fixed blade ends located outside the plurality of side fixed blade teeth are respectively provided on the left and right ends of the fixed blade body, the fixed blade ends having smooth outer side surfaces, and the outer side surfaces of the fixed blade ends smoothly transition to the top surface, the outer side surfaces of the fixed blade ends forming a U-shaped or C-shaped structure from front to back, and the corresponding outer side surfaces of the base ends are U-shaped or C-shaped structures, the lowermost end of the fixed blade body has a bottom plane, the bottom surfaces of the side fixed blade teeth and the fixed blade ends are coplanar with the bottom plane, the top surface of the base end is close to or attached to the bottom surface of the fixed blade end, and the outer edge of the top surface of the base end is aligned or substantially aligned with the outer edge of the bottom surface of the fixed blade end.

[0012] A hair cutting assembly as described above, wherein the base includes a base body, the base end protruding upward above the base body so that a space is formed between the base body and the fixed knife to accommodate the movable knife and allow the movable knife to move left and right. The base is provided with a first welding portion located on the inner side of the base end, and the bottom of the fixed knife is provided with a second welding portion that can be laser-welded to the first welding portion. The second welding portion is located on the inner side of the outer side of the fixed knife end. The base is provided with a laser passage hole for allowing the first welding portion to be exposed from the bottom of the base to allow laser to enter and weld the first welding portion to the second welding portion.

[0013] In the hair cutting assembly described above, the bottom of the fixed knife is provided with upwardly concave fixed knife positioning holes on the inner sides of the left and right ends respectively, and the fixed knife positioning holes are located outside the central mounting hole. The top of the base is provided with a positioning column that is upwardly inserted into the fixed knife positioning hole.

[0014] In the hair cutting assembly described above, the side wall of the positioning column serves as the first welding portion, and the outer side of the fixed knife positioning hole serves as the second welding portion. The positioning column is integrally formed with the base, or the positioning column is an independent component, the upper end of which is inserted into the fixed knife positioning hole and welded to the fixed knife, and the lower end is pressed upward on the base. The left and right ends of the movable knife are respectively provided with inwardly concave avoidance grooves, and the positioning column is arranged corresponding to the avoidance grooves in the left and right directions.

[0015] A hair cutting assembly as described above, a driving device for driving the movable knife and the intermediate knife assembly to move back and forth left and right is provided between the fixed knife and the base, a supporting device for supporting the movable knife and the intermediate knife assembly upward is provided below the movable knife and the intermediate knife assembly, the driving device includes a driving connecting member for connecting to an external driving device, and a cutter connecting member, the cutter connecting member is fixed below the movable knife, the intermediate knife assembly includes an intermediate bracket for mounting the intermediate knife, the intermediate bracket is provided with a toggle hole, the cutter connecting member is provided with a toggle rod inserted in the toggle hole for toggle the intermediate bracket to move back and forth left and right, the toggle rod cooperates with the toggle hole so that the intermediate knife assembly can float up and down relative to the toggle rod, the middle part of the movable knife is provided with a movable knife hole for giving way to the intermediate knife assembly, and the supporting device includes a first elastic structure acting on the intermediate bracket to elastically press the intermediate knife upward against the bottom of the intermediate knife net.

[0016] According to the hair cutting assembly described above, the movable knife is a sheet-like structure, the intermediate knife assembly passes through and is located in the movable knife hole, and the left and right ends of the movable knife hole are respectively provided with extension holes extending outward on the front and rear sides. An inner connecting plate is formed between the front and rear extension holes of each end, and the intermediate bracket is located between the left and right inner connecting plates. The intermediate knife is an inverted U-shaped structure, and the left and right ends of the intermediate knife extend outward beyond the left and right ends of the intermediate bracket, and the side walls on the left and right ends of the intermediate knife are inserted into the extension holes.

[0017] In the hair cutting assembly described above, the cutter connecting member includes a crossbar, a driving connecting portion facing downward for connecting to a driving connecting member is provided at the bottom of the crossbar, and vertical rods facing upward for fixing to the movable cutter are provided at both ends of the crossbar. The lower end of the toggle lever is fixed to the middle part of the crossbar, and the upper part of the toggle lever is provided with an arcuate surface protruding to the left and right sides and spanning from top to bottom. The left and right side walls of the toggle hole are provided with straight walls straightened up and down. The arcuate surface cooperates with the straight walls to enable the intermediate bracket to be sleeved on the toggle lever for up and down movement and to enable the intermediate bracket to rotate up and down around the arcuate surface.

[0018] In the hair cutting assembly described above, the support device includes a movable blade support structure for supporting the bottom of the movable blade, the movable blade support structure being located outside the intermediate blade assembly. The movable blade support structure includes support bars arranged in the left-right direction on the base body and / or balls capable of rolling on the base body, or the movable blade support structure is a second elastic structure that elastically presses the movable blade upward.

[0019] According to the hair cutting assembly described above, a movable groove is provided in the middle portion of the base from left to right for the tool connecting member to move left and right. First welding portions are respectively provided at the left and right ends of the movable groove on the base, which are welded and fixed to the bottom of the fixed knife. The left and right ends of the movable groove respectively penetrate downward through the base to form laser passage holes for the first welding portions to be exposed from below for the laser to pass through. A slider is provided at the bottom of the intermediate bracket to be inserted into the movable groove. The slider slidably cooperates with the movable groove to enable the intermediate bracket to slide in the left and right direction. The slider is provided with a limit groove for the tool connecting member to be engaged with and to limit the forward and backward movement of the tool connecting member.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The rigid fixed blade of the present invention is not easy to deform, has structural strength, and is fixed to the base. The top surfaces of the fixed blade body and the side fixed blade teeth serve as the skin contact surfaces, which belong to the top surface of the fixed blade, and are conducive to being made into a flat plane or curved surface. The middle blade net is exposed upward from the middle mounting hole in the middle part of the fixed blade body, avoiding the formation of complex and excessively high steps on the top of the hair cutting assembly. When shaving, the skin contact surface and the top surface of the middle blade net are moved in contact with the skin, and the movable blade is located below the fixed blade to avoid the movable blade contacting the skin; because the side fixed blade teeth have a first blade with an acute angle, and the side movable blade teeth have a second blade with an acute angle, the side movable blade teeth cooperate with the side fixed blade teeth to cut sharply, avoiding pulling hair, and the hair cutting assembly has a good skin feel and comfort when shaving.

[0022] 2. The fixed blade is formed by powder metallurgy, which facilitates the one-time formation of multiple side fixed blade teeth and a sharp-angled first blade edge, as well as a top surface with a central protrusion. The structure is simple and easy to manufacture. The central protrusion is used to correspond to the upwardly protruding middle blade net to shield the left and right ends of the middle blade net to prevent the left and right ends of the middle blade net from irritating the skin. The central protrusion has a smooth or substantially smooth transition 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 of the top of the hair cutting component when it is in contact with the skin.

[0023] 3. The base end is aligned or substantially aligned with the outer side surface of the fixed blade end, and the fixed blade end has a smooth outer side surface, and the outer side surface of the fixed blade end transitions smoothly to the top surface, so that the left and right ends of the hair cutting assembly have a good skin feel when contacting the skin, avoiding skin irritation, thereby improving the user experience when shaving body parts such as armpits and inner thighs.

[0024] 4. A first welding portion is provided on the inner side of the end portion of the base, a second welding portion that can be laser-welded with the first welding portion is provided on the bottom of the fixed knife, the second welding portion is located on the inner side of the outer side surface of the end portion of the fixed knife, and a laser through hole is provided on the base for the first welding portion to be exposed from the bottom of the base so as to allow the laser to enter and weld the first welding portion to the second welding portion. The fixed knife and the base are fixed by laser welding, the process is simple and convenient, and after welding, the welding points of the first welding portion and the second welding portion are located on the inner side of the fixed knife and the base, avoiding exposure to the skin, affecting the skin feel and damaging the appearance.

[0025] 5. By providing inwardly slanted and downwardly inclined surfaces on the front and rear side walls of the central mounting hole, the angle b of the inclined surface relative to the up and down direction f is ≥ 40°. Preferably, the angle b is further limited to between 50° and 70°, and the front and rear sides of the middle knife net are attached to the inclined surface to form an arc-shaped structure convex upward from the middle mounting hole. The structure is simple, which is conducive to the middle knife net arching to form a circular arc structure or a nearly circular arc structure, so as to better fit with the middle knife below to cut hair and avoid cutting hair without sharpness. In addition, the front and rear sides of the middle knife net are laser welded to the inclined surface. Since the inclined surface is located on the inner side of the middle mounting hole, the welding point is prevented from being exposed on the top and outer surfaces of the fixed knife. In addition, the lower part of the middle knife net is kept clear of the area corresponding to the middle mounting hole, so that the middle knife can cover a wider area and increase the effective cutting area.

[0026] 6. The inscribed circle r formed by the front and rear inclined surfaces. When the tangent point of the inscribed circle r and the front and rear inclined surfaces is located above the middle of the corresponding inclined surfaces, the inscribed circle r is lower than the top surface of the middle bulge, which is conducive to the front and rear sides of the knife net being attached to the inclined surface and arching upward. The knife net is lower than the top surface of the middle bulge, avoiding the left and right ends of the knife net being exposed to irritate the skin, and avoiding the curvature of the knife net being too large, so that the knife net can better form an arc structure.

Brief Description of the Drawings

[0027] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 is an exploded view of a hair cutting assembly of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a hair cutting assembly of the present invention;

[0030] Figure 3 1 is a schematic diagram of the top structure of a hair cutting assembly of the present invention;

[0031] Figure 4 This is a schematic diagram of the bottom structure of a hair cutting assembly of the present invention;

[0032] Figure 5It is a bottom schematic diagram of the fixed knife of the present invention;

[0033] Figure 6 is a cross-sectional view of a fixed knife of the present invention;

[0034] Figure 7 Fixed cutting edge Figure 6 Cross-sectional view in the middle DD direction;

[0035] Figure 7a yes Figure 7 An enlarged cross-sectional view of the side fixed cutter tooth E;

[0036] Figure 8 1 is a bottom schematic diagram of the fixed knife and the middle knife net of the present invention;

[0037] Figures 9a-9b It is a cross-sectional view of two different fixed knives and the middle knife net;

[0038] Figure 10 The present invention is a hair cutting assembly along Figure 11 Cross-sectional view in CC direction;

[0039] Figure 11 The present invention is a hair cutting assembly along Figure 10 Cross-sectional view in the AA direction;

[0040] Figure 12 The present invention is a hair cutting assembly along Figure 10 Cross-sectional view in the middle BB direction;

[0041] Figure 13 This is a structural diagram of the base in the present invention, in which the first elastic structure and the second elastic structure are installed;

[0042] Figure 14-15 It is a structural diagram of the movable knife, intermediate knife assembly and driving device;

[0043] Figure 16 1 is a schematic structural diagram of an embodiment of a hair cutting assembly according to the present invention, in which a movable blade supporting structure adopts a supporting strip;

[0044] Figure 17 1 is a schematic structural diagram of an embodiment of a hair cutting assembly according to the present invention, in which a movable blade support structure adopts support bars and balls;

[0045] Figure 18 2 is a schematic structural diagram of an embodiment in which the middle blade net has anti-drop holes;

[0046] Figure 19 This is a structural schematic diagram of an embodiment of a hair cutting assembly according to the present invention, in which a middle blade mesh is movably mounted up and down in a middle mounting hole;

[0047] Figure 20 This is a structural diagram of an embodiment in which a U-shaped intermediate blade net is installed on a fixed blade;

[0048] Figure 21 is a structural schematic diagram of another embodiment of the first welding portion of the base;

[0049] Figure 22 is a structural schematic diagram of another embodiment of the second welding portion of the fixed blade;

[0050] Figure 23 1 is a schematic structural diagram of an embodiment of a hair cutting assembly according to the present invention, which adopts another first welding portion and a second welding portion;

[0051] Figure 24 This is another cross-sectional view of the fixed knife and the middle knife net;

[0052] Figure 25 It is a structural schematic diagram of an embodiment in which an independent positioning column is used to fix the fixed knife and the base. [Specific implementation method]

[0053] The present invention will be further described below in conjunction with the accompanying drawings:

[0054] like Figures 1 to 23 The hair cutting assembly shown is used for the cutter head of a shaver, comprising a rigid fixed knife 1 and a base 2, wherein the fixed knife 1 is fixed to the base 2, and the fixed knife 1 comprises a fixed knife body 11, and a plurality of side fixed knife teeth 12 arranged in the left and right directions are provided on the front and rear sides of the fixed knife body 11. Of course, the side fixed knife teeth 12 can also be provided only on the front or rear side of the fixed knife body 11, which is omitted in the figure; the top surface of the fixed knife body 11 and the side fixed knife teeth 12 serves as the skin contact surface 10, and the left and right sides of the side fixed knife teeth 12 respectively have a first cutting edge 121 with an acute angle, and a movable knife 4 that can move left and right is provided below the fixed knife 1, and the movable knife 4 is provided with a side movable knife tooth 4 located below the side fixed knife teeth 12 and used to cooperate with the side fixed knife teeth 12 to cut hair. 1. The left and right sides of the side movable blade teeth 41 respectively have acute-angled second blades 411. The middle part of the fixed blade body 11 is located on the inner side of the side fixed blade teeth 12 and is provided with a middle mounting hole 13. An intermediate blade net 3 exposed upward from the middle mounting hole 13 is provided between the base 2 and the fixed blade 1. An intermediate blade assembly 5 is provided below the intermediate blade net 3. The intermediate blade assembly 5 includes an intermediate blade 51 that can be attached to the bottom of the intermediate blade net 3 and move left and right. When the intermediate blade 51 is attached to the intermediate blade net 3 and moves, it cuts off the hair entering the mesh of the intermediate blade net. A driving device 6 for driving the movable blade 4 and the intermediate blade assembly 5 to reciprocate left and right is provided between the fixed blade 1 and the base 2. A supporting device for supporting the movable blade 4 and the intermediate blade assembly 5 upward is provided below the movable blade 4 and the intermediate blade assembly 5.

[0055] The rigid fixed blade 1 is not easy to deform and has structural strength. It is fixed to the base 2. The top surface of the fixed blade body 11 and the side fixed blade teeth 12 serves as the skin contact surface 10, which belongs to the top surface of the fixed blade 1, which is conducive to making it into a flat plane or curved surface. The middle blade net 3 is exposed upward from the middle mounting hole 13 in the middle of the fixed blade body 11, avoiding the formation of complex and excessively high steps on the top of the hair cutting assembly. When shaving, the skin contact surface 10 and the top surface of the middle blade net 3 are moved against the skin. The movable blade 4 is located below the fixed blade 1 to prevent the movable blade from contacting the skin; the side fixed blade teeth 12 have a first blade edge 121 with an acute angle, and the side movable blade teeth 41 have a second blade edge 411 with an acute angle. The side movable blade teeth 41 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.

[0056] The thickness of the side fixed blade teeth 12 is between 0.3mm-0.6mm, and is used for cutting longer hair; the middle blade net 3 is made of a metal sheet with a mesh, and the material thickness of the metal sheet is between 0.04mm-0.15mm, preferably 0.05mm-0.08mm, and is used for shaving shorter hair and shaving the hair cleanly.

[0057] Preferably, 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. The top of the fixed blade body 11 is low on the front and rear sides and gradually rises toward the middle to form a central protrusion 14. When viewed from the left and right directions, the top surface of the fixed blade body 11 smoothly or substantially smoothly transitions from the top of the central protrusion 14 to the front and rear sides. The central mounting hole 13 divides the central protrusion 14 into left and right sections. The middle blade net 3 projects upward from the central mounting hole 13 above the front and rear sides of the fixed blade body 11 corresponding to the central protrusion 14. The fixed blade 1 is formed by powder metallurgy, which facilitates the one-time formation of multiple side fixed blade teeth 12 and the acute-angled first blade edge 121, as well as a top surface with a central protrusion 14. The structure is simple and easy to manufacture. The central protrusion 14 is used to correspond to the upwardly protruding middle blade net 3 to shield the left and right ends of the middle blade net 3 to prevent the left and right ends of the middle blade net 3 from irritating the skin. The central protrusion 14 has a smooth or substantially smooth transition 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 of the top of the hair cutting component when it is in contact with the skin.

[0058] like Figure 6As shown, the curvature of the top surface of the middle protrusion 14 is different from the curvature of the top surface of the side fixed blade teeth 12, and when viewed from the left and right directions, the extension line L of the top surface of the side fixed blade teeth 12 to the side of the middle protrusion 14 is located below the top surface of the middle protrusion 14, so that the middle protrusion 14 can be raised to a certain height to avoid the thickness of the side fixed blade teeth 12 being too large.

[0059] Of course, you can also Figure 24 In the illustrated embodiment, the top surface of the fixed knife forms an overall upwardly convex arched structure from the front side fixed knife teeth 12 to the rear side fixed knife teeth 12 .

[0060] Preferably, the left and right ends of the fixed knife body 11 are respectively provided with fixed knife ends 17 located on the outside of the multiple side fixed knife teeth 12, and the base 2 includes base ends 21 located at the left and right ends, corresponding to the side fixed knife teeth 12 on each side, and an air avoidance groove 22 concave from the front and / or rear side of the base 2 is provided between the left and right base ends 21. The air avoidance groove 22 allows the side fixed knife teeth 12 to be exposed from the bottom of the base 2 and suspended outside the base 2, so that the side fixed knife teeth 12 can better hook long hair for cutting, and the base end 21 is aligned or substantially aligned with the outer side surface of the fixed knife end 17. The fixed knife end 17 has a smooth outer side surface, and the outer side surface of the fixed knife end 17 transitions smoothly with the top surface, so that the left and right ends of the hair cutting assembly have a good skin feel when contacting the skin, avoiding irritation to the skin, thereby improving the user experience when shaving body parts such as armpits and inner thighs.

[0061] Preferably, to further enhance the smoothness and skin feel of the left and right ends of the hair cutting assembly, the outer surface of the fixed blade end 17 forms a U-shaped or C-shaped structure from front to back, and the outer surface of the base end 21 also has a U-shaped or C-shaped structure. The lowermost end of the fixed blade body 11 has a bottom plane 16, and the bottom surfaces of the side fixed blade teeth 12 and the fixed blade end 17 are coplanar with the bottom plane 16. The top surface of the base end 21 is close to or in contact with the bottom surface of the fixed blade end 17, and 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.

[0062] Since the bottom surfaces of the multiple side fixed blade teeth 12 need to be ground flat as a whole to better ensure the sharpness of cutting in cooperation with the side movable blade teeth 41, the bottom surfaces of the side fixed blade teeth 12 and the fixed blade end portion 17 are coplanar with the bottom end plane 16, so that the bottom of the fixed blade 1 can be plane-ground on a whole plane, and at the same time, the bottom surfaces of the side fixed blade teeth 12 and the bottom surfaces of the fixed blade end portion 17 are flat, thereby simplifying the processing technology of the fixed blade.

[0063] Preferably, if Figure 1 、4 As shown in Figures 5, 8, 10, 13, and 21-23, the base 2 includes a base body 20, and the base end 21 protrudes upward above the base body 20 to form a space between the base body 20 and the fixed knife 1 to accommodate the movable knife 4 and allow the movable knife 4 to move left and right. A first welding portion 23 is provided on the base 2 on the inner side of the base end 21, and a second welding portion 18 that can be laser-welded with the first welding portion 23 is provided on the bottom of the fixed knife 1. The second welding portion 18 is located on the inner side of the outer side surface of the fixed knife end 17, and a laser through hole 24 is provided on the base 2 for the first welding portion 23 to be exposed from the bottom of the base 2 for the laser to enter and weld the first welding portion 23 to the second welding portion 18, so that the welding points of the first welding portion 23 and the second welding portion 18 are located on the inner side of the fixed knife 1 and the base 2 to avoid being exposed to the skin and affecting the skin feel and destroying the appearance shape.

[0064] In a preferred embodiment, Figure 1 、 5 As shown in Figures 8, 10, 13 and 25, the bottom of the fixed knife 1 is provided with upwardly concave fixed knife positioning holes 19 on the inner sides of the left and right ends respectively, and the fixed knife positioning hole 19 is located on the outside of the middle mounting hole 13. The top of the base 2 is provided with a positioning column 23a which is upwardly inserted into the fixed knife positioning hole 19 to facilitate laser welding of the first welding part 23 and the second welding part 18 after the fixed knife 1 and the base 2 are positioned and installed.

[0065] Furthermore, the side wall of the positioning column 23a serves as the first welding portion 23, and the outer side of the fixed knife positioning hole 19 serves as the second welding portion 18. The structure is simple and helps to firmly connect the welded fixed knife 1 to the base 2. In one embodiment, as Figure 10 As shown, the positioning column 23a is integrally formed with the base 2, with a simple structure and fewer parts; in another embodiment, as shown Figure 25 As shown, the positioning column 23a is an independent component, the upper end of which is inserted into the fixed knife positioning hole 19 and welded to the fixed knife 1, and the lower end is bent to the side and pressed from the bottom to the base 2 to fix the fixed knife 1 and the base 2 together, avoiding the integral molding of an upwardly protruding positioning column structure on the base 2, which is beneficial to the production and molding of the base 2 during powder metallurgy. At the same time, it is beneficial for the positioning columns at both ends to be respectively assembled with the fixed knife positioning holes 19, reducing the production precision requirements of the fixed knife and the base, and reducing the production difficulty.

[0066] The left and right ends of the movable knife 4 are respectively provided with a concave avoidance groove 42. In the left and right directions, the positioning column 23a is set corresponding to the avoidance groove 42, which is beneficial to shortening the length of the fixed knife 1 in the left and right directions while ensuring the cutting range of the side fixed knife teeth 12 and the side movable knife teeth 41 in the left and right directions, and is beneficial to reducing the ineffective cutting area outside the side fixed knife teeth 12 in the left and right directions.

[0067] In another preferred embodiment, Figure 21-23 In the embodiment shown, the top surface of the uppermost end of the base 2 is the top surface of the base end 21, and the first welding portion 23 is coplanar with the top surface of the base end 21; the second welding portion 18 is a platform, and its bottom surface is coplanar with the bottom plane 16. The first welding portion 23 and the second welding portion 18 are welded together and fixed. When the fixed blade 1 and the base 2 are welded, they are positioned by aligning the outer side surface of the base end 21 with the fixed blade end 17, which helps to simplify the manufacturing process of the base 2 and the fixed blade 1.

[0068] Preferably, if Figure 5-6 , 8-9b, 11-12, 16-19, the middle mounting hole 13 is a rectangular hole, and its length direction is along the left and right direction of the fixed knife body 11, and an inwardly slanted downward inclined surface 15 is provided on the front and rear side walls of the middle mounting hole 13. In the front and rear directions, the width of the middle knife net 3 is greater than the width of the middle mounting hole 13, and the front and rear sides of the middle knife net 3 are attached to the inclined surface 15 and form a continuous arc structure convex upward from the middle mounting hole 13. The structure is simple and is conducive to the middle knife net 3 arching to form an arc structure or a structure close to an arc structure, so as to better fit the middle knife 51 below to cut hair and avoid blunt cutting and hair pulling; and through the inclined surface 15 and the arc-shaped middle knife net 3, the front and rear sides of the middle knife net 3 are facilitated to be laser welded on the inclined surface 15, as shown Figure 8 As shown, since the inclined surface 15 is located on the inner side of the middle mounting hole 13, the welding point 15c is prevented from being exposed on the top and outer surfaces of the fixed knife; another method is to avoid the air below the middle knife net 3 in the area corresponding to the middle mounting hole 13, so that the middle knife can cover a wider area and increase the effective cutting area. Furthermore, the fixed knife body 11 is provided with a knife net positioning part 15a protruding from the bottom of the inclined surface 15, and the middle knife net 3 is provided with a knife net positioning hole 31 that matches the knife net positioning part 15a. Or as Figure 19 As shown, the middle knife net 3 is provided with an anti-slip hole 32, and the inclined surface 15 is provided with an anti-slip column 15b extending downward, and the anti-slip column 15b is inserted into the anti-slip hole 32. The front and rear sides of the middle knife net 3 are movably installed in the middle mounting hole 13 up and down, and the anti-slip column 15b extends to the position of the movable knife 4 to prevent the middle knife net 3 from falling out from under the anti-slip column 15b.

[0069] Preferably, if Figure 6As shown, the angle b of the inclined surface 15 relative to the up and down direction f is ≥ 40°, and the inscribed circle r formed by the front and rear inclined surfaces 15, when the tangent point of the inscribed circle r and the front and rear inclined surfaces 15 is located above the middle of the corresponding inclined surface 15, the inscribed circle r is lower than the top surface of the middle protrusion 14, so that when the front and rear sides of the knife net 3 are attached to the inclined surface 15 and arch upward, the knife net 3 is lower than the top surface of the middle protrusion 14, avoiding the left and right ends of the knife net 3 from being exposed to irritate the skin, and avoiding the curvature of the knife net 3 from being too large, so that the knife net can better form an arc structure.

[0070] Of course, you can also Figure 20 As shown, the middle knife net 3 is not a continuous arc structure, and it is an inverted U-shaped structure composed of front and rear side walls and a top. The front and rear side walls of the middle mounting hole 13 correspond to the front and rear side walls of the middle knife net 3 and are welded and fixed.

[0071] Preferably, the side fixed blade teeth 12 have a large root width that gradually tapers toward the end, and a large root thickness that gradually tapers toward the end. The lowermost end of the fixed blade body 11 has a bottom plane 16, and the bottom surface of the side fixed blade teeth 12 is coplanar with the bottom plane 16. The head of the side fixed blade teeth 12 is provided with a thickening head 124, which is larger than the tooth body of the side fixed blade teeth 12 adjacent to the thickening head 124. The thickening head 124 protrudes downward from the bottom plane 16, which facilitates making the side fixed blade teeth 12 thinner while ensuring structural strength, improving their efficiency in combing and cutting long hair and shortening the length of the hair roots after shearing. The thickening head 124 improves the skin feel at the tooth tip of the side fixed blade teeth 12. The thickening head 124 is larger than the tooth body of the side fixed blade teeth 12 adjacent to the thickening head 124, which refers to being larger only in the height direction, or being larger in both the height and width directions. The thickening head 124 is formed by laser sintering the outer end of the side fixed blade 12. Figure 9b As shown, the thickness of the side fixed blade teeth 12 from the root to the end is consistent or substantially consistent.

[0072] Preferably, if Figure 7a As shown, the left and right sides of the side fixed blade tooth 12 are respectively provided with tooth flanks that are inclined downward and outward. These flanks are formed by powder metallurgy and include an upper bevel 122 and a lower bevel 123. With respect to the vertical direction f, the inclination angle of the lower bevel 123 is greater than the inclination angle of the upper bevel 122. The lower bevel 123 and the bottom surface of the side fixed blade tooth 12 form an acute-angled first cutting edge 121. The angle a between the lower bevel 123 and the bottom surface of the side fixed blade tooth 12 is ≤70°, which provides good sharpness and prevents the width of the side fixed blade tooth 12 from being too large when forming the first cutting edge 121 with an angle a ≤70°.

[0073] As an embodiment of the driving device 6, Figure 1 、10 As shown in Figure 11, the driving device 6 includes a driving connector 61 for connecting to an external driving device, and a tool connector 62. The tool connector 62 is fixed below the movable knife 4. The driving connector 61 is connected to the tool connector 62 and moves back and forth with the tool connector 62 and the movable knife 4 when the driving connector 61 moves back and forth. The intermediate knife assembly 5 includes an intermediate bracket 52 for mounting the intermediate knife 51. The intermediate bracket 52 is provided with a toggle hole 521. The tool connector The connecting part 62 is provided with a toggle rod 624 which is inserted into the toggle hole 521 and is used to toggle the intermediate bracket 52 to move back and forth when the tool connecting part 62 moves back and forth. The toggle rod 624 cooperates with the toggle hole 521 so that the intermediate knife assembly 5 can float up and down relative to the toggle rod 624. The middle part of the movable knife 4 is provided with a movable knife hole 43 for making way for the intermediate knife assembly 5. The supporting device includes a first elastic structure 71 which acts on the intermediate bracket 52 to elastically press the intermediate knife 51 upward to the bottom of the intermediate knife net 3.

[0074] Preferably, if Figure 1 、 14 As shown in Figure 15, the movable knife 4 is a sheet structure, and the second blade 411 on the side movable knife tooth 41 can be formed into an acute angle structure by etching process; the intermediate knife assembly 5 passes through and is located in the movable knife hole 43, and the left and right ends of the movable knife hole 43 are respectively provided with extension holes 431 extending outward on the front and rear sides, and an inner connecting plate 44 is formed between the front and rear extension holes 431 of each end, and the intermediate bracket 52 is located between the left and right two inner connecting plates 44, and the intermediate knife 51 is an inverted U-shaped structure formed by bending a metal plate, and the left and right ends of the intermediate knife 51 extend outward beyond the left and right ends of the intermediate bracket 52, and the side walls on the left and right ends of the intermediate knife 51 are inserted into the extension holes 431, so as to reduce the volume of the structure composed of the movable knife 4 and the intermediate knife assembly 5, especially the height in the up and down direction, and at the same time make the intermediate knife 51 have a longer length in the left and right direction, so that the cutting area covered by the intermediate knife 51 when it moves left and right is wider, and the ineffective cutting area of ​​the intermediate knife net 3 in the left and right directions is reduced.

[0075] Preferably, the avoidance groove 42 of the movable knife 4 is correspondingly provided 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 intermediate knife 51 can be longer.

[0076] Preferably, if Figure 1 、 10As shown in Figure 23, the tool connecting member 62 includes a cross bar 621, and a driving connecting part 622 facing downward for connecting to the driving connecting member 61 is provided at the bottom of the cross bar 621. Both ends of the cross bar 621 are provided with vertical rods 623 facing upward for fixing to the movable knife 4. The lower end of the toggle rod 624 is fixed on the middle part of the cross bar 621, and the upper part of the toggle rod 624 is provided with an arc surface 625 protruding to the left and right sides and spanning from top to bottom. The left and right side walls of the toggle hole 521 are provided with straight walls 522 straightened up and down. The arc surface 625 cooperates with the straight wall 522 to enable the intermediate bracket 52 to be mounted on the toggle rod 624 and move up and down, and the intermediate bracket 52 can rotate up and down around the arc surface 625. The structure is simple and the volume is small.

[0077] Preferably, if Figure 12-13 As shown, a movable groove 27 is provided in the middle of the base 2 from left to right for the tool connector 62 to move left and right. The base 2 is provided with a first welding portion 23 at the left and right ends of the movable groove 27. The left and right ends of the movable groove 27 respectively penetrate the base 2 downward to form a laser passage hole 24 for the first welding portion 23 to be exposed from below for the laser to pass through. The bottom of the intermediate bracket 52 is provided with a slider 523 inserted into the movable groove 27. The slider 523 slidably cooperates with the movable groove 27 to enable the intermediate bracket 52 to slide in the left and right directions. The slider 523 is provided with a limiting groove 524 for the tool connector 62 to be engaged and to limit the forward and backward movement of the tool connector 62. The structure is simple, and during operation, the movable knife and the intermediate knife assembly 5 can better reciprocate in the left and right directions, and it is beneficial to reduce the height of the hair cutting assembly in the vertical direction.

[0078] The supporting device includes a movable knife supporting structure for supporting the bottom of the movable knife 4. The movable knife supporting structure is located on the outside of the intermediate knife assembly 5, which is conducive to making the supporting position close to the side movable knife teeth 41 to improve the sharpness of the coordinated cutting between the side movable knife teeth 41 and the side fixed knife teeth 12.

[0079] As a preferred embodiment of the movable knife support structure, Figure 1 、 10 As shown in Figures 13 and 23, the movable knife support structure is a second elastic structure 72 that elastically presses the movable knife 4 upward, so that the side movable knife teeth 41 are better attached to the bottom of the side fixed knife teeth 12. Preferably, the first elastic structure 71 and the second elastic structure 72 are springs, which are conducive to reducing the height of the first elastic structure 71 and the second elastic structure 72 in the vertical direction, and the first elastic structure 71 and the second elastic structure 72 are integrally formed, which is convenient for installation and fixation;

[0080] As another preferred embodiment of the movable knife support structure, Figure 16As shown, the movable blade support structure includes a support bar 28 provided on the base body 20 in the left-right direction. The support bar 28 supports the side movable blade teeth 41 below the side fixed blade teeth 12 from below. The structure is simple. A narrow gap is formed between the support bar 28 and the fixed blade for the sheet-shaped movable blade 4 to move within, so that the movable blade can be made thinner and reduced in size while preventing the movable blade from deforming downward.

[0081] As a third preferred embodiment of the movable knife support structure, Figure 17 As shown, the movable knife support structure includes a ball 8 that can roll on the base body 20, and the ball 8 supports the side movable knife teeth 41 below the side fixed knife teeth 12 from below to reduce the friction when the movable knife 4 moves; further, the movable knife support structure also includes a support bar 28 arranged on the base body 20 along the left and right directions.

[0082] Preferably, the base 2 is formed by powder metallurgy. A downwardly extending rotational connection portion 25 is integrally formed at the bottom of the base 2, and a rotational connection hole 26 is provided in the rotational connection portion 25, resulting in a simple structure. The base end portion 21, first welding portion 23, laser aperture 24, and movable groove 27 are integrally formed during injection molding of the base 2.

[0083] The powder metallurgy process for forming the fixed blade and base includes injecting a metal powder through an injection mold on an injection machine to form the blanks for the fixed blade and base. The blanks are then degreased and sintered to form the metal fixed blade and base, which are then heat-treated and hardened. The bottom surface of the fixed blade can be further ground to create a smooth bottom surface 16 and the bottom surfaces of the side fixed blade teeth 12.

[0084] The hair cutting assembly has a large cutting area, a small volume, and can provide a better shaving experience.

Claims

1. A hair cutting assembly, characterized in that: The invention comprises a rigid fixed knife (1) and a base (2), wherein the fixed knife (1) is fixed on the base (2), and the fixed knife (1) comprises a fixed knife body (11), and a plurality of side fixed knife teeth (12) arranged in the left and right directions are provided on the front side and / or the rear side of the fixed knife body (11), and the top surface of the fixed knife body (11) and the side fixed knife teeth (12) serve as skin contact surfaces (10), and the left and right sides of the side fixed knife teeth (12) respectively have a first blade (121) with an acute angle, and a movable knife (4) capable of moving left and right is provided below the fixed knife (1), and the movable knife (4) is provided with a side movable knife located below the side fixed knife teeth (12). The side movable blade teeth (41) are provided with acute-angled second blades (411) on the left and right sides respectively; a middle mounting hole (13) is provided in the middle of the fixed blade body (11) and located inside the side fixed blade teeth (12); an intermediate blade net (3) is provided between the base (2) and the fixed blade (1) and is exposed upward from the middle mounting hole (13); a material thickness of the intermediate blade net (3) is between 0.04 mm and 0.15 mm; an intermediate blade assembly (5) is provided below the intermediate blade net (3); and the intermediate blade assembly (5) includes an intermediate blade (51) that can be attached to the bottom of the intermediate blade net (3) and move left and right.

2. A hair cutting assembly according to claim 1, characterized in that: The fixed knife body (11) is formed by powder metallurgy, and the side fixed knife teeth (12) and the fixed knife body (11) are integrally injection-molded. The top of the fixed knife body (11) is low on the front and rear sides and gradually increases towards the middle to form a middle protrusion (14). When viewed from the left and right directions, the top surface of the fixed knife body (11) smoothly transitions or basically smoothly transitions from the top of the middle protrusion (14) to the front and rear sides. The middle mounting hole (13) breaks the middle protrusion (14) into two left and right sections. The middle knife net (3) corresponds to the middle protrusion (14) and protrudes upward from the middle mounting hole (13) above the front and rear sides of the fixed knife body (11).

3. A hair cutting assembly according to claim 2, characterized in that: The middle mounting hole (13) is a rectangular hole, the length direction of which is along the left-right direction of the fixed knife body (11). On the front and rear side walls of the middle mounting hole (13), inclined surfaces (15) facing inward and downward are provided. In the front and rear directions, the width of the middle knife net (3) is greater than the width of the middle mounting hole (13), and the front and rear sides of the middle knife net (3) are attached to the inclined surfaces (15) to form a continuous arc structure convex upward from the middle mounting hole (13).

4. A hair cutting assembly according to claim 3, characterized in that: The angle b of the inclined surface (15) relative to the vertical direction f is ≥40°, and the inscribed circle (r) formed by the front and rear inclined surfaces (15) is lower than the top surface of the middle protrusion (14) when the tangent point of the inscribed circle (r) and the front and rear inclined surfaces (15) is located above the middle of the corresponding inclined surface (15). The front and rear sides of the middle knife net (3) are welded to the inclined surface (15) by laser, and the middle knife net (3) is lower than the top surface of the middle protrusion (14).

5. A hair cutting assembly according to claim 2, characterized in that: The side fixed blade teeth (12) have a large root width and gradually become smaller towards the end, and a large root thickness and gradually become smaller towards the end. The lowermost end of the fixed blade body (11) has a bottom end plane (16). The bottom surface of the side fixed blade teeth (12) is coplanar with the bottom end plane (16). The head of the side fixed blade teeth (12) is provided with a thickening head (124). The thickening head (124) is larger than the tooth body of the side fixed blade teeth (12) adjacent to the thickening head (124). The thickening head (124) protrudes downward below the bottom end plane (16).

6. A hair cutting assembly according to any one of claims 1 to 5, characterized in that: The base (2) comprises base end portions (21) located at left and right ends, corresponding to the side fixed blade teeth (12) on each side, and a clearance groove (22) is provided between the left and right base end portions (21) and is concave from the front side and / or rear side of the base (2), and the clearance groove (22) allows the side fixed blade teeth (12) to be exposed from below the base (2) and suspended outside the base (2), and fixed blade end portions (17) located outside the plurality of side fixed blade teeth (12) are provided on the left and right ends of the fixed blade body (11), respectively, and the fixed blade end portion (17) has a smooth outer side surface, and the outer side surface of the fixed blade end portion (17) is in contact with the fixed blade teeth (12). The top surface has a smooth transition, the outer side surface of the fixed knife end portion (17) forms a U-shaped or C-shaped structure from front to back, and the corresponding outer side surface of the base end portion (21) is a U-shaped or C-shaped structure, the lowermost end of the fixed knife body (11) has a bottom plane (16), the bottom surfaces of the side fixed knife teeth (12) and the fixed knife end portion (17) are coplanar with the bottom plane (16), the top surface of the base end portion (21) is close to or attached to the bottom surface of the fixed knife end portion (17), and the outer edge (211) of the top surface of the base end portion (21) is aligned or substantially aligned with the outer edge (171) of the bottom surface of the fixed knife end portion (17).

7. A hair cutting assembly according to claim 6, characterized in that: The base (2) includes a base body (20), the base end (21) protrudes upward above the base body (20) so that a space for accommodating a movable knife (4) and allowing the movable knife (4) to move left and right is formed between the base body (20) and the fixed knife (1), a first welding portion (23) is provided on the inner side of the base end (21) on the base (2), a second welding portion (18) capable of laser welding with the first welding portion (23) is provided on the bottom of the fixed knife (1), the second welding portion (18) being located on the inner side of the outer side of the fixed knife end (17), and a laser through hole (24) is provided on the base (2) for allowing the first welding portion (23) to be exposed from the bottom of the base (2) so as to allow laser to enter and weld the first welding portion (23) to the second welding portion (18).

8. A hair cutting assembly according to claim 7, characterized in that: The bottom of the fixed knife (1) is provided with upwardly concave fixed knife positioning holes (19) on the inner sides of the left and right ends respectively. The fixed knife positioning holes (19) are located outside the middle mounting hole (13). The top of the base (2) is provided with a positioning column (23a) which is upwardly inserted into the fixed knife positioning hole (19).

9. A hair cutting assembly according to claim 8, characterized in that: The side wall of the positioning column (23a) serves as a first welding portion (23), and the outer side of the fixed knife positioning hole (19) serves as a second welding portion (18). The positioning column (23a) is integrally formed with the base (2), or the positioning column (23a) is an independent component, the upper end of which is inserted into the fixed knife positioning hole (19) and welded to the fixed knife (1), and the lower end is pressed onto the base (2) from bottom to top. The left and right ends of the movable knife (4) are respectively provided with concave avoidance grooves (42), and in the left and right directions, the positioning column (23a) is arranged corresponding to the avoidance grooves (42).

10. A hair cutting assembly according to any one of claims 1-5, 7-9, characterized in that: A driving device (6) for driving the movable knife (4) and the intermediate knife assembly (5) to move back and forth is provided between the fixed knife (1) and the base (2); a supporting device for supporting the movable knife (4) and the intermediate knife assembly (5) upward is provided below the movable knife (4) and the intermediate knife assembly (5); the driving device (6) includes a driving connecting member (61) for connecting to an external driving device, and a knife connecting member (62); the knife connecting member (62) is fixed below the movable knife (4); the intermediate knife assembly (5) includes an intermediate bracket (52) for mounting the intermediate knife (51); the intermediate bracket (52) is provided with a toggle hole (521), and the tool connecting member (62) is provided with a toggle rod (624) inserted into the toggle hole (521) for toggling the intermediate bracket (52) to move back and forth. The toggle rod (624) cooperates with the toggle hole (521) so that the intermediate knife assembly (5) can float up and down relative to the toggle rod (624). The middle part of the movable knife (4) is provided with a movable knife hole (43) for giving way to the intermediate knife assembly (5). The supporting device includes a first elastic structure (71) that acts on the intermediate bracket (52) to elastically press the intermediate knife (51) upward on the bottom of the intermediate knife net (3).

11. A hair cutting assembly according to claim 10, characterized in that: The movable knife (4) is a sheet-like structure, the intermediate knife assembly (5) passes through and is located in the movable knife hole (43), and the left and right ends of the movable knife hole (43) are respectively provided with extension holes (431) extending outward on the front and rear sides, and an inner connecting plate (44) is formed between the front and rear extension holes (431) of each end, and the intermediate bracket (52) is located between the left and right inner connecting plates (44). The intermediate knife (51) is an inverted U-shaped structure, and the left and right ends of the intermediate knife (51) extend outward outside the left and right ends of the intermediate bracket (52), and the side walls on the left and right ends of the intermediate knife (51) are inserted into the extension holes (431).

12. A hair cutting assembly according to claim 11, characterized in that: The tool connecting member (62) comprises a cross bar (621), the bottom of the cross bar (621) is provided with a driving connecting portion (622) facing downward for connecting to the driving connecting member (61), both ends of the cross bar (621) are provided with vertical rods (623) facing upward for fixing to the movable knife (4), the lower end of the toggle rod (624) is fixed to the middle part of the cross bar (621), the upper part of the toggle rod (624) is provided with an arc surface (625) protruding to the left and right sides and spanning from top to bottom, and the left and right side walls of the toggle hole (521) are provided with straight walls (522) straightened up and down, and the arc surface (625) cooperates with the straight wall (522) so that the intermediate bracket (52) can be sleeved on the toggle rod (624) and move up and down and the intermediate bracket (52) can rotate up and down around the arc surface (625).

13. The hair cutting assembly according to claim 10, characterized in that: The supporting device includes a movable knife supporting structure for supporting the bottom of the movable knife (4), the movable knife supporting structure is located on the outside of the intermediate knife assembly (5), the movable knife supporting structure includes a support bar (28) arranged on the base body (20) in the left-right direction and / or a ball (8) that can roll on the base body (20), or the movable knife supporting structure is a second elastic structure (72) that elastically presses the movable knife (4) upward.

14. The hair cutting assembly according to claim 10, characterized in that: A movable groove (27) is provided on the middle part of the base (2) from left to right for the tool connecting member (62) to move left and right. A first welding portion (23) is provided on the base (2) at the left and right ends of the movable groove (27) and is welded and fixed to the bottom of the fixed knife (1). The left and right ends of the movable groove (27) respectively penetrate the base (2) downward to form a laser through hole (24) for the first welding portion (23) to be exposed from below for the laser to pass through. A slider (523) is provided at the bottom of the intermediate bracket (52) to be inserted into the movable groove (27). The slider (523) and the movable groove (27) are slidably matched to enable the intermediate bracket (52) to slide in the left and right directions. A limiting groove (524) is provided on the slider (523) for the tool connecting member (62) to be clamped and to limit the forward and backward movement of the tool connecting member (62).

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