Reciprocating knife head

Abstract

A reciprocating cutter head, comprising a moving cutter group, the moving cutter group comprising a moving cutter seat driven by a transmission member to reciprocate and being substantially T-shaped, an intermediate cutter assembly and a side moving cutter assembly being sequentially stacked and installed on the moving cutter seat from top to bottom, the intermediate cutter assembly comprising a central moving cutter corresponding to a main cutter face skin slot area, a plurality of intermediate cutter floating elastic pressure members elastically supporting the central moving cutter on the moving cutter seat, forming a left-right symmetrical four-corner outer / inner eight-type supporting structure at the lower bottom of the central moving cutter, and the intermediate cutter assembly being non-contact stacked and installed above the side moving cutter assembly through the four-corner outer / inner eight-type supporting structure in the accommodating groove. The four-corner outer / inner eight-type supporting structure not only non-contact installs the intermediate moving cutter assembly and the side moving cutter assembly in the cutter head, but also makes the central moving cutter have up-down floating property, realizes self-adaptive fitting of the central moving cutter with the main cutter face, and improves cutting efficiency.

Description

Technical Field

[0001] This utility model relates to a reciprocating blade for personal hygiene and care. Background Technology

[0002] Reciprocating razors on the market consist of a stationary foil, a plastic support base, and a moving blade assembly. The stationary foil is made of thin, bent metal. The moving blades need to fit snugly against the underside of the foil to cut, requiring a precise match between the blade tip and the foil's curvature. Uneven stress on the foil during use can cause excessive current, potentially leading to jamming. Furthermore, prolonged use can cause deformation of the foil, affecting cutting efficiency and causing fraying or tearing. For thin, bent metal foils, adding springs to the fixed blade support can prevent a fixed fit, but this only allows for some flexibility and is suitable for single-moving blades. For irregularly shaped foils, especially unconventional N-shaped foils with zoned feed grooves, single-moving blades cannot meet the cutting requirements. Multi-moving blade structures in reciprocating razor heads typically use multiple moving blade units arranged side-by-side to correspond to different zones, requiring a large cavity and resulting in a larger razor head and more components. Summary of the Invention

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a reciprocating cutter head with two stacked cutter groups that do not interfere with each other, which has a compact internal structure and small space requirements.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a reciprocating cutter head, comprising a cutter holder, an outer cutter net connected to the cutter holder, and a moving cutter assembly A that is in relative motion contact with the lower bottom surface of the outer cutter net. The moving cutter assembly is installed in a receiving cavity formed by the cutter holder and the outer cutter net. The outer cutter net is integrally formed and has a curved cross-section, that is, the outer cutter net includes a main cutter face with an arc-shaped cross-section in the length direction and two side cutter faces formed by bending downward and inward on the two long sides of the main cutter face. The main cutter face and the two side cutter faces are provided with skin-friendly groove areas, and a plurality of feed grooves are distributed on the skin-friendly groove areas. The moving cutter assembly includes a moving cutter seat that is driven to reciprocate by a transmission component and is generally T-shaped, and from top to bottom... The intermediate blade assembly and the side blade assembly are stacked and installed on the moving blade holder. The intermediate blade assembly corresponds to the skin-friendly groove area of ​​the main blade surface to achieve cutting, and the side blade assembly corresponds to the skin-friendly groove areas of the two side blade surfaces to achieve cutting. The intermediate blade assembly includes a central moving blade corresponding to the skin-friendly groove area of ​​the main blade surface, and several intermediate blade floating spring members that elastically support the central moving blade on the moving blade holder. The lower parts of the several intermediate blade floating spring members pass through the side blade assembly and press against the moving blade holder, thereby forming a left-right symmetrical four-corner outward / inward eight-type support structure at the bottom of the central moving blade. The intermediate blade assembly is stacked and installed above the side blade assembly in the receiving groove without contact with the side blade assembly through the four-corner outward / inward eight-type support structure.

[0005] As an improvement: the intermediate blade assembly and the side blade assembly of the moving blade group are respectively provided with a lateral positioning structure that cooperates with the moving blade seat to achieve lateral positioning. The lateral positioning structure includes an intermediate lateral positioning structure set in the middle position of the intermediate blade assembly and a side end lateral positioning structure set at the left and right ends of the side blade assembly. The intermediate lateral positioning structure includes a longitudinally extending rail groove set in the middle position of the moving blade seat and a support guide rod extending downward from the middle position of the bottom surface of the central moving blade. The support guide rod is inserted into the rail groove and can slide up and down in the rail groove. The side end lateral positioning structure is a snap-fit ​​structure. The snap-fit ​​structure includes a 7-shaped snap hook and an inner groove that can move up and down to cooperate with the longitudinal rib of the 7-shaped snap hook. The free hook part of the 7-shaped snap hook limits the inner groove and restricts the inner groove from coming out.

[0006] As an improvement: the central moving blade integral molding includes a long blade surface extending in the reciprocating direction and corresponding to the skin-friendly groove area of ​​the main blade surface, and a support guide shank extending downward from the middle part of the two horizontal side edges of the long blade surface to form a grooved support.

[0007] As an improvement: the two transverse edges of the long blade are respectively provided with connecting parts adapted to the upper part of the middle blade floating spring member at symmetrical positions on the left and right sides of the support guide. The middle blade floating spring member is elastically supported on the moving blade seat in an outward / inward eight-shaped manner at the four corner positions of the middle blade floating spring member fixed under the bottom of the long blade.

[0008] As an improvement: the intermediate knife floating spring-loaded component includes an upper horizontal part that is horizontally plate-shaped and can be fixed in conjunction with the connecting part, a bent deformation part that extends obliquely downward from one end of the upper horizontal part, and a lower abutting part that abuts against the moving knife seat and whose free end is upturned outward.

[0009] As an improvement: the moving tool holder is generally T-shaped, including a generally long seat body and a transmission head integrally formed at the lower part of the seat body. The seat body is provided with an outer arc boss corresponding to the four corner outer / inner eight-type support structure and extending outward from the horizontal side of the seat body to guide and limit the lower part of the floating spring pressure component of the intermediate tool. Through the guidance and limitation of the outer arc boss, the four corner outer / inner eight-type support structure achieves surface balance for supporting the central moving tool.

[0010] As an improvement: the side-moving knife assembly includes a side-moving knife installed in the accommodating groove below the central moving knife and corresponding to the skin-friendly groove areas of the two side blades, and a side-moving knife floating spring member fixedly installed on the moving knife seat body. Several elastic feet on the left and right sides of the side-moving knife floating spring member abut against the bottom surface of the side-moving knife, thereby achieving a tight fit between the side-moving knife and the skin-friendly groove areas of the two side blades. The side-moving knife includes a connecting body extending in the reciprocating direction and adapted to the accommodating cavity, and side-cutting parts formed outward from the two transverse side edges of the connecting body respectively, corresponding to and cooperating with the skin-friendly groove areas of the two side blades. The connecting body has a second through hole for the central knife floating spring member to pass through and abut against the moving knife seat body.

[0011] As an improvement: the intermediate blade assembly and the side blade assembly of the moving blade group are respectively provided with a lateral positioning structure that cooperates with the moving blade seat to achieve lateral positioning. The lateral positioning structure includes an intermediate lateral positioning structure set in the middle position of the side blade assembly and a side end lateral positioning structure set at the left and right ends of the intermediate blade assembly. The intermediate lateral positioning structure includes a longitudinally extending rail groove set in the middle position of the moving blade seat and a support slide bar extending downward from the middle position of the bottom surface of the side blade assembly. The support slide bar is inserted into the rail groove and can slide up and down in the rail groove. The side end lateral positioning structure is a snap-fit ​​structure. The snap-fit ​​structure includes a 7-shaped snap hook and an inner groove that can move up and down to cooperate with the longitudinal rib of the 7-shaped snap hook. The free hook part of the 7-shaped snap hook limits the inner groove and restricts the inner groove from coming out.

[0012] The beneficial effects of this utility model are as follows: The use of stacked double-moving blade assemblies maximizes space utilization, significantly reducing the size of the blade head. It is suitable for irregularly shaped stationary blade meshes, especially unconventional n-shaped stationary blades with partitioned hair inlet grooves, accommodating both long and short hairs. The stacked double-moving blade assemblies are non-contact, ensuring they do not interfere with each other and are independent. The middle blade assembly features a four-corner outward / inward eight-way support structure. This structure not only allows the middle moving blade assembly and the side moving blade assemblies to be installed non-contact within the blade head but also enables the central moving blade to float vertically, achieving adaptive and tight fit between the central moving blade and the main blade surface, improving cutting efficiency and avoiding hair pulling problems. The blade head surface is smooth, without sharp edges or burrs, and has a large hair inlet area with strong overall integrity, greatly reducing the risk of skin cuts, providing a better feel, and facilitating processing. The reciprocating blade head using this design can achieve screwless assembly, and even glue-free and threadless connections, making it environmentally friendly and providing a stable connection. The internal structure is clear, compact, and reasonable.

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one embodiment of the reciprocating cutter head of this utility model.

[0015] Figure 2 for Figure 1 A schematic diagram of the explosion structure.

[0016] Figure 3 This is a schematic diagram of the moving tool assembly.

[0017] Figure 4 This is a schematic diagram of the intermediate blade assembly.

[0018] Figure 5 This is a schematic diagram of a four-corner external / inward octagonal support structure. Detailed Implementation

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, one embodiment of the reciprocating cutter head of this utility model is described. A reciprocating cutter head includes a cutter holder 3, an outer cutter net 1 integrally formed from a flexible metal sheet connected to the cutter holder 3, and a moving cutter group A that is in relative motion contact with the lower bottom surface of the outer cutter net 1. The moving cutter group is installed in a receiving cavity surrounded by the cutter holder and the outer cutter net. The moving blade assembly is installed in the receiving cavity surrounded by the blade holder and the outer blade net. In this embodiment, the reciprocating blade head is a hammer-shaped blade head. The outer blade net 1 is integrally formed and has a curved cross-section. That is, the outer blade net includes a main blade surface 11 with an arc-shaped cross-section in the length direction and two side blade surfaces 12 formed by bending the two long sides of the main blade surface 11 downwards and inwards. The main blade surface 11 and the two side blade surfaces 12 are connected by an arc. The main blade surface 11 and the two side blade surfaces 12 are provided with skin-friendly groove areas. Several hair inlet grooves are distributed in the skin-friendly groove areas. That is, the skin-friendly groove area of ​​the main blade surface is set in the middle to form the middle skin-friendly groove area 13. The skin-friendly groove areas on the two side blade surfaces 12 extend from the connection position with the main blade surface to the two side blade surfaces to form the two side skin-friendly groove areas 14. Alternatively, as shown in this embodiment, the two side skin-friendly groove areas can be formed from the front and rear sides of the main blade surface 11 away from the middle skin-friendly groove area to the two side blade surfaces. The moving blade assembly includes a generally T-shaped moving blade holder 4 that reciprocates driven by a transmission component, and intermediate blade assemblies and side moving blade assemblies stacked on the moving blade holder 4 from top to bottom. Compared with the existing unit-type parallel arrangement, the stacked installation adopted in this embodiment has no duplicate parts, requires a small volume, and has a compact and clear internal structure. The intermediate blade assembly corresponds to the central skin-friendly groove area to achieve cutting, and the side moving blade assemblies correspond to the two side skin-friendly groove areas to achieve cutting. The intermediate blade assembly includes a central moving blade 5 corresponding to the central skin-friendly groove area and four intermediate blade floating spring members 6 that elastically support the central moving blade on the moving blade holder 4. The lower parts of the four intermediate blade floating spring members 6 pass through the side moving blade assemblies and press against the moving blade holder 4, thereby forming a left-right symmetrical four-corner outward / inward eight-shaped support structure under the central moving blade. The intermediate blade assembly is stacked on top of the side moving blade assembly in the receiving groove through the four-corner outward / inward eight-shaped support structure without contact with the side moving blade assembly. This embodiment shows a four-corner outward-eight-type support structure. The four-corner inward-eight-type structure can be achieved simply by reversing the four intermediate knife floating spring-loaded components 6 in this embodiment. The principle is the same and will not be repeated here.

[0020] Both the intermediate blade assembly and the side blade assembly are mounted on the moving blade holder, which drives their reciprocating motion. The intermediate blade assembly and the side blade assembly must be stacked without contact while ensuring their lateral positioning on the moving blade holder. Therefore, in this embodiment, the two sets of moving blades achieve lateral positioning and vertical guidance at the central and end positions, respectively, allowing for floating movement. Specifically, the intermediate blade assembly and the side blade assembly of the moving blade group are each equipped with a lateral positioning structure that cooperates with the moving blade holder to achieve lateral positioning. This lateral positioning structure includes a central lateral positioning structure located in the middle of the intermediate blade assembly and side end lateral positioning structures located at the left and right ends of the side blade assembly. The central lateral positioning structure includes a longitudinally extending rail groove 41 located in the middle of the moving blade holder and a support guide 52 extending downwards from the middle of the bottom surface of the central moving blade 5. The support guide 52 is inserted into the rail groove and can slide up and down within it. The free end of the support guide 52 is large-headed, making the sliding within the rail groove smoother, reducing friction, and assisting in front and rear lateral positioning, preventing back-and-forth swaying and twisting. This embodiment employs a central moving blade 5 integrally formed, comprising a long blade surface 51 extending in the reciprocating direction and corresponding to the central skin-friendly groove area, and double support guide handles 52 extending downward from the middle of the two horizontal side edges of the long blade surface to form grooves 41 that cooperate with the rails. The double support guide handles 52 are arranged parallel to each other, and the corresponding double rails 41 are respectively opened at the middle positions of the front and rear side walls of the moving blade seat. On the two horizontal side edges of the long blade surface, at symmetrical positions away from the support guide handles on the left and right sides, there are connecting parts 53 adapted to the upper part of the floating spring member of the central blade. Through the connecting parts 53, the floating spring member of the central blade is elastically supported on the moving blade seat 4 in an outward octagonal shape at the four corners of the central blade surface 51. The side-end lateral positioning structure is a groove structure, which includes a 7-shaped hook 44, an inner groove 75 that can move up and down with the longitudinal rib 45 of the 7-shaped hook, and the free hook part 46 of the 7-shaped hook upper limit the inner groove and restrict the inner groove from coming out.

[0021] Of course, the positions can also be interchanged. That is, the lateral positioning structure includes a middle lateral positioning structure set in the middle position of the side moving knife assembly and a side end lateral positioning structure set at the left and right ends of the middle knife assembly. The middle lateral positioning structure includes a longitudinally extending rail groove set in the middle position of the moving knife seat and a support slide bar extending downward from the middle position of the bottom surface of the side moving knife assembly. The support slide bar is inserted into the rail groove and can slide up and down in the rail groove. The side end lateral positioning structure is a snap-fit ​​structure. The snap-fit ​​structure includes a 7-shaped snap hook and an inner groove that can move up and down to cooperate with the longitudinal rib of the 7-shaped snap hook. The free hook part of the 7-shaped snap hook limits the inner groove and restricts the inner groove from coming out.

[0022] The aforementioned intermediate blade floating spring-loaded component includes an upper horizontal portion 61, which is shaped like a horizontal plate and can be fixed in place with a connecting portion; a bent and deformed portion 62 extending obliquely downward from one end of the upper horizontal portion 61; and a lower abutting portion 63, which abuts against the moving blade holder 4 and has its free end curving upward and outward. In the free, pressure-bearing state, the angle formed between the upper horizontal portion and the bent and deformed portion 62 of the intermediate blade floating spring-loaded component is an obtuse angle. In particular, intermediate blade floating spring-loaded components with an angle of 105 degrees to 168 degrees achieve a balance between upper pressure bearing capacity and lower damping and limiting capacity. To make the four-corner outward-eight-shaped support structure formed by the four intermediate blade floating spring-loaded components more stable and achieve surface balance, this embodiment adds a guide limit stop to the lower abutment part 63 at the abutment of the seat body on the basis of the lower friction limit. Specifically, the moving blade seat is generally T-shaped, including a generally long seat body and a transmission head integrally formed at the lower part of the seat body. The seat body is provided with an outer arc boss 42 corresponding to the four-corner outward-eight-shaped support structure and extending outward from the horizontal edge of the seat body to guide and limit the lower part of the intermediate blade floating spring-loaded component. The outer arc boss protrudes upward along the outer arc edge to form an arc edge stop 43. The outer side of the lower abutment part 63 presses against the arc edge stop, which increases the damping of the lower abutment part and provides guidance for the movement of the lower abutment part 63. Furthermore, the positions of the four outer arc bosses 42 are fixed, and the four-corner outward-eight-shaped support structure with the four feet acting on the four outer arc bosses 42 respectively has stronger centering, ensuring that the center of the four-corner outward-eight-shaped support structure is always on the central axis. That is, through the guide and limit of the outer arc boss, the four corner outward eight-type support structure achieves surface balance for the support of the central moving knife 5.

[0023] The side-moving blade assembly includes a side-moving blade 7 installed in the receiving groove below the central moving blade and corresponding to the skin-friendly groove areas of the two side blade surfaces 12, and a side-moving blade floating spring member 8 fixedly installed on the moving blade seat 4. Several elastic feet on the left and right sides of the side-moving blade floating spring member 8 abut against the bottom surface of the side-moving blade, thereby achieving a tight fit between the side-moving blade and the skin-friendly groove areas of the two side blade surfaces 12. The side-moving blade 7 includes a connecting body 71 extending in the reciprocating direction and adapted to the receiving cavity, and side blade portions 72 formed outward from the two transverse side edges of the connecting body, corresponding to and cooperating with the skin-friendly groove areas of the two side blade surfaces 12. The connecting body 71 has a first through hole 73 for the support guide 52 to pass through and cooperate with the rail groove 41, and a second through hole 74 for the intermediate blade floating spring member to pass through and abut against the moving blade seat 4. The second through hole is an elongated through hole, that is, its length must be sufficient to not hinder the deformation of the bending deformation portion 62.

[0024] Both the intermediate blade assembly and the side blade assembly are vertically floating, allowing them to fit snugly against their corresponding skin-friendly grooves, thus improving cutting efficiency and preventing issues such as pulling or missing hairs.

[0025] In this embodiment, the outer blade net 1 is fixedly installed on the blade holder by a blade support to ensure the integrity of the outer blade net 1. The blade holder is composed of two connecting units connected and fixed from the left and right. The locking of the split blade holder after assembly can be achieved by interference fit or snap-fit ​​structure. However, to further ensure the stability after assembly, this embodiment adds a clamping member 8. The clamping member 8 is fully or partially installed on the blade holder, that is, the clamping member 8 at least partially surrounds the left and right connecting units laterally. After the two connecting units are inserted into the left and right sides of the outer blade net 1 equipped with the blade support and connected to form the blade holder, the clamping member locks the two connecting units of the blade holder. The clamping member 8 can be a spring bar. In this embodiment, it is exposed for easy identification. Of course, for aesthetic purposes, it can be hidden and embedded.

[0026] The stationary blade mesh on the reciprocating blade head of this invention is not easily deformed. The thickness of the stationary blade mesh can be as thin as less than 10 mils or even as thin as 4-5 mils, achieving an ultra-thinness that cannot be achieved by other processes and structures. This not only makes the blade head sharper and shaves cleaner, but also provides sufficient support for a longer lifespan, thus ensuring the cutting sharpness and safety of the reciprocating blade head.

[0027] Although the present invention has been disclosed above with specific embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended claims.

Claims

1. A reciprocating cutter head, comprising a cutter holder (3), an outer cutter head (1) connected to the cutter holder (3), and a moving cutter assembly (A) in relative motion contact with the lower surface of the outer cutter head (1), wherein the moving cutter assembly is installed in a receiving cavity formed by the cutter holder and the outer cutter head, characterized in that: The outer blade net (1) is integrally formed and has a curved cross-section. That is, the outer blade net includes a main blade surface (11) with an arc-shaped cross-section in the length direction and two side blade surfaces (12) formed by bending the two long sides of the main blade surface (11) downwards. The main blade surface (11) and the two side blade surfaces (12) are provided with skin-friendly groove areas, and several burr grooves are distributed on the skin-friendly groove areas. The moving blade assembly includes a moving blade seat (4) that is driven by a transmission component to reciprocate and is generally T-shaped, an intermediate blade assembly and a side moving blade assembly that are stacked and installed on the moving blade seat (4) from top to bottom. The intermediate blade assembly is aligned with the skin-friendly groove area of ​​the main blade surface. The cutting should be achieved by the side moving blade assembly and the skin-friendly groove area of ​​the two sides blade surface (12). The middle blade assembly includes a central moving blade (5) corresponding to the skin-friendly groove area of ​​the main blade surface, and several middle blade floating spring pressure members (6) that elastically support the central moving blade on the moving blade seat (4). The lower part of the several middle blade floating spring pressure members (6) passes through the side moving blade assembly and presses against the moving blade seat (4), thereby forming a left-right symmetrical four-corner outer / inner eight-type support structure at the bottom of the central moving blade. The middle blade assembly is installed above the side moving blade assembly in the receiving groove by non-contact stacking with the side moving blade assembly through the four-corner outer / inner eight-type support structure.

2. The reciprocating cutter head according to claim 1, characterized in that: The intermediate blade assembly and the side blade assembly of the moving blade group are respectively provided with a lateral positioning structure that cooperates with the moving blade seat to achieve lateral positioning. The lateral positioning structure includes an intermediate lateral positioning structure set in the middle position of the intermediate blade assembly and a side end lateral positioning structure set at the left and right ends of the side blade assembly. The intermediate lateral positioning structure includes a longitudinally extending rail groove (41) set in the middle position of the moving blade seat and a support guide (52) extending downward from the middle position of the bottom surface of the central moving blade (5). The support guide is inserted into the rail groove and can slide up and down in the rail groove. The side end lateral positioning structure is a snap-in structure. The snap-in structure includes a 7-shaped snap hook and an inner groove that can move up and down with the longitudinal rib of the 7-shaped snap hook. The free hook part of the 7-shaped snap hook limits the inner groove and restricts the inner groove from coming out.

3. The reciprocating cutter head according to claim 2, characterized in that: The central moving blade (5) is integrally formed, including a long blade surface (51) that extends in the reciprocating direction and corresponds to the skin-friendly groove area of ​​the main blade surface, and a support guide shank that extends downward from the middle part of the two horizontal side edges of the long blade surface to form a groove (41) that cooperates with the rail.

4. The reciprocating cutter head according to claim 3, characterized in that: The two transverse edges of the long blade are respectively provided with connecting parts (53) that are adapted to the upper part of the middle blade floating spring-loaded component at symmetrical positions on the left and right sides of the support guide handle. The middle blade floating spring-loaded component is elastically supported on the moving blade seat (4) in an outward / inward eight-shaped manner at the four corner positions of the middle blade floating spring-loaded component under the long blade (51).

5. The reciprocating cutter head according to claim 4, characterized in that: The intermediate knife floating spring-loaded component includes an upper horizontal part (61) that is horizontally shaped and can be fixed with the connecting part, a bent deformation part (62) that extends obliquely downward from one end of the upper horizontal part (61), and a lower abutting part (63) that abuts against the moving knife seat (4) and whose free end is raised upward and outward.

6. The reciprocating cutter head according to claim 1, 2, 3, 4, or 5, characterized in that: The moving tool holder is generally T-shaped and includes a generally long seat body and a transmission head integrally formed at the lower part of the seat body. The seat body is provided with an outer arc boss (42) corresponding to the four corner outer / inner eight-type support structure and extending outward from the horizontal side of the seat body to guide and limit the lower part of the floating spring pressure component of the middle tool. Through the guidance and limitation of the outer arc boss, the four corner outer / inner eight-type support structure achieves surface balance for the support of the central moving tool (5).

7. The reciprocating cutter head according to claim 1, 2, 3, 4, or 5, characterized in that: The side-moving knife assembly includes a side-moving knife (7) installed in the accommodating groove below the central moving knife and corresponding to the skin-friendly groove area of ​​the two side blades (12), and a side-moving knife floating spring member (8) fixedly installed on the moving knife seat (4). Several elastic feet on the left and right sides of the side-moving knife floating spring member (8) abut against the bottom surface of the side-moving knife, thereby achieving a tight fit between the side-moving knife and the skin-friendly groove area of ​​the two side blades (12). The side-moving knife (7) includes a connecting body (71) extending in the reciprocating direction and adapted to the accommodating cavity, and a side-knife part (72) formed from the two transverse side edges of the connecting body to correspond to and cooperate with the skin-friendly groove area of ​​the two side blades (12). The connecting body (71) has a second through hole (74) for the central knife floating spring member to pass through and abut against the moving knife seat (4).

8. The reciprocating cutter head according to claim 6, characterized in that: The side-moving knife assembly includes a side-moving knife (7) installed in the accommodating groove below the central moving knife and corresponding to the skin-friendly groove area of ​​the two side blades (12), and a side-moving knife floating spring member (8) fixedly installed on the moving knife seat (4). Several elastic feet on the left and right sides of the side-moving knife floating spring member (8) abut against the bottom surface of the side-moving knife, thereby achieving a tight fit between the side-moving knife and the skin-friendly groove area of ​​the two side blades (12). The side-moving knife (7) includes a connecting body (71) extending in the reciprocating direction and adapted to the accommodating cavity, and a side-knife part (72) formed from the two transverse side edges of the connecting body to correspond to and cooperate with the skin-friendly groove area of ​​the two side blades (12). The connecting body (71) has a second through hole (74) for the central knife floating spring member to pass through and abut against the moving knife seat (4).

9. The reciprocating cutter head according to claim 1, characterized in that: The intermediate blade assembly and the side blade assembly of the moving blade group are respectively provided with a lateral positioning structure that cooperates with the moving blade seat to achieve lateral positioning. The lateral positioning structure includes an intermediate lateral positioning structure set in the middle position of the side blade assembly and a side end lateral positioning structure set at the left and right ends of the intermediate blade assembly. The intermediate lateral positioning structure includes a longitudinally extending rail groove (41) set in the middle position of the moving blade seat and a support slide bar extending downward from the middle position of the bottom surface of the side blade assembly. The support slide bar is inserted into the rail groove and can slide up and down in the rail groove. The side end lateral positioning structure is a snap-fit ​​structure. The snap-fit ​​structure includes a 7-shaped snap hook and an inner groove that can move up and down with the longitudinal rib of the 7-shaped snap hook. The free hook part of the 7-shaped snap hook limits the inner groove and restricts the inner groove from coming out.

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