Reciprocating tool bit

Abstract

A reciprocating type tool bit comprises a movable cutter set, and the movable cutter set comprises a movable cutter base which is driven by a transmission part to reciprocate and is roughly in a T shape, a middle cutter assembly and a side movable cutter assembly, and the middle cutter assembly and the side movable cutter assembly are sequentially installed on the movable cutter base in a stacked mode from top to bottom. The middle cutter assembly comprises a central moving cutter corresponding to the skin-friendly groove area of the main cutter face, a plurality of middle cutter floating elastic pressing pieces used for elastically supporting the central moving cutter on the moving cutter base, and a four-corner outer / inner eight-type supporting structure formed at the lower bottom of the central moving cutter in a bilateral symmetry mode. The middle cutter assembly is installed above the side moving cutter assembly in the containing groove in a non-contact stacking mode through a four-corner outer / inner eight-type supporting structure and the side moving cutter assembly. According to the four-corner outer / inner eight-type supporting structure, the middle movable cutter assembly and the side movable cutter assembly are installed in the cutter head in a non-contact mode, the central movable cutter has the vertical floatability, the central movable cutter is matched with the main cutter face in a self-adaptive mode and is tightly matched with the main cutter face, and the cutting efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a reciprocating head for personal cleaning and care. BACKGROUND

[0002] The reciprocating razors on the market include a static blade net, a plastic support seat and a moving blade assembly, the static blade net is a thin metal bending, and the moving blade needs to be closely matched with the lower surface of the static blade net to achieve cutting, the blade part of the moving blade even needs to be accurately matched with the bending curvature of the blade net, and meanwhile, when the product is in use, uneven force on the static blade net will cause current to be too large, and serious will cause the phenomenon of carding machine, in addition, after long-term use, the static blade net will be deformed, which will affect the cutting efficiency, and the situation of pulling or tearing hair. For the static blade net which is a thin metal bending, a spring part is added on the static blade assembly, i.e. the fixed blade support, to avoid the problem of dead matching, but this structure can only make the whole blade net have a certain floating property, and can only be applied to single moving blade. For the irregular n-shaped static blade net with partitioned beard slot, the single moving blade cannot meet the cutting demand. The multi-moving blade structure in the reciprocating head generally adopts multiple moving blade units arranged in parallel to correspond to the partitions, which needs a large space accommodating cavity, i.e. the head has a large volume, and has many parts. SUMMARY

[0003] The present application aims at the defects of the prior art, and provides a reciprocating head with two moving blade groups stacked on each other without affecting each other, which has compact internal structure and small space requirement.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a reciprocating head, comprising a holder, an outer blade net connected to the holder, a moving blade group A in contact with the lower surface of the outer blade net for opposite movement, the moving blade group is installed in an accommodating cavity surrounded by the holder and the outer blade net, the outer blade net is integrally formed and has a curved cross section, i.e. the outer blade net comprises a main blade surface with an arc-shaped cross section in the length direction, and two side inclined blade surfaces bent inwardly and downward from the two long edges of the main blade surface, the main blade surface and the two side blade surfaces are provided with skin-friendly groove areas, and a plurality of beard slots are distributed on the skin-friendly groove areas, the moving blade group comprises a moving blade seat in the form of T which is driven by a transmission member to reciprocate, a middle blade assembly and a side moving blade assembly which are stacked and installed on the moving blade seat from top to bottom, the middle blade assembly is matched with the skin-friendly groove area of the main blade surface to realize cutting, and the side moving blade assembly is matched with the skin-friendly groove area of the two side blade surfaces to realize cutting, the middle blade assembly comprises a central moving blade corresponding to the skin-friendly groove area of the main blade surface, and a plurality of middle blade floating elastic pressure members which elastically support the central moving blade on the moving blade seat, the lower parts of the plurality of middle blade floating elastic pressure members pass through the side moving blade assembly and press on the moving blade seat, so that a four-corner outer / inner eight-type supporting structure is formed on the lower bottom of the central moving blade, and the middle blade assembly is non-contactedly stacked and installed above the side moving blade assembly in the accommodating groove through the four-corner outer / inner eight-type supporting structure.

[0005] As an improvement: the middle knife assembly and the side knife assembly of the moving knife group are respectively provided with transverse positioning structures cooperating with the moving knife seat to realize transverse positioning, the transverse positioning structure comprises a middle transverse positioning structure arranged at the middle position of the middle knife assembly and a side end transverse positioning structure arranged at the left and right side positions of the side knife assembly, the middle transverse positioning structure comprises a longitudinally extending rail groove arranged at the middle position of the moving knife seat and a supporting guide handle downwardly extending from the middle position of the lower bottom surface of the central moving knife, the supporting guide handle is inserted into the rail groove and can slide up and down in the rail groove, and the side end transverse positioning structure is a buckle groove structure, the buckle groove structure comprises a 7-shaped buckle hook and an inner recess groove which can move up and down in cooperation with the longitudinal rib of the 7-shaped buckle hook, and the free hook part of the 7-shaped buckle hook limits the inner recess groove and prevents the inner recess groove from coming out.

[0006] As an improvement: the central moving knife is integrally formed to comprise a long strip knife surface extending in the reciprocating direction and corresponding to the main knife surface skin groove area, and supporting guide handles downwardly extending from the middle positions of the two horizontal side edges of the long strip knife surface and cooperating with the rail groove.

[0007] As an improvement: symmetrical positions are respectively arranged on the two horizontal side edges of the long strip knife surface and left and right sides of the supporting guide handles, and a coupling part adapted to the upper part of the middle knife floating elastic compression piece is arranged at each symmetrical position, so that the middle knife floating elastic compression piece is supported on the moving knife seat in an outer / inner eight type elastic manner through the coupling part.

[0008] As an improvement: the middle knife floating elastic compression piece comprises an upper horizontal part in a horizontal sheet shape and fixedly connected to the coupling part, a bending deformation part outwardly and downwardly extending from one end of the upper horizontal part, and a lower abutting part abutting on the moving knife seat and upwardly and outwardly tilted at the free end.

[0009] As an improvement: the moving knife seat is generally in a T shape and comprises a generally long strip seat body and a transmission head integrally formed at the lower part of the seat body, an outer arc boss is arranged on the seat body and outwardly expanded from the horizontal side of the seat body to guide and limit the lower part of the middle knife floating elastic compression piece, and the four corner outer / inner eight type supporting structure is arranged corresponding to the four corner outer / inner eight type supporting structure, so that the support of the four corner outer / inner eight type supporting structure to the central moving knife realizes surface balance.

[0010] As an improvement: the side moving knife assembly comprises a side moving knife installed below the central moving knife in the accommodating groove and corresponding to the two side knife surface skin groove areas, and a side knife floating elastic compression piece fixedly installed on the seat body of the moving knife seat, the elastic feet on the left and right sides of the side knife floating elastic compression piece abut on the bottom surface of the side moving knife, so as to realize the close fit of the side moving knife and the two side knife surface skin groove areas, the side moving knife comprises a connecting body extending in the reciprocating direction and adaptively connected to the accommodating cavity, and a side knife part corresponding to the two side knife surface skin groove areas is formed outwardly from the two horizontal side edges of the connecting body, and a second through hole is formed on the connecting body to allow the middle knife floating elastic compression piece to pass through and abut on the seat body of the moving knife seat.

[0011] As an improvement: the intermediate knife assembly and the side moving knife assembly of the moving knife group are respectively provided with transverse positioning structures matched with the moving knife seat to realize transverse positioning, the transverse positioning structures include an intermediate transverse positioning structure arranged at the intermediate position of the side moving knife assembly and side end transverse positioning structures arranged at the left and right side positions of the intermediate knife assembly, the intermediate transverse positioning structure includes a longitudinally extending rail groove arranged at the intermediate position of the moving knife seat and a supporting sliding handle downwardly extended at the intermediate position of the lower bottom surface of the side moving knife assembly, the supporting sliding handle is inserted into the rail groove and can slide up and down in the rail groove, and the side end transverse positioning structure is a buckle groove structure, the buckle groove structure includes a 7-shaped buckle hook and an inner recess groove which can move up and down in cooperation with the longitudinal rib of the 7-shaped buckle hook, and the free hook part of the 7-shaped buckle hook limits the inner recess groove and restricts the inner recess groove from coming out.

[0012] The beneficial effects of the present application are as follows: the double moving knife assemblies arranged in a stacked manner have high space utilization, greatly reduce the volume of the knife head, are suitable for special-shaped static knife nets, especially unconventional n-shaped static knives with partitioned hair inlet grooves, and can be used for both long and short hairs. The double moving knife assemblies arranged in a stacked manner are non-contact and independent. The intermediate knife assembly has a four-corner outer / inner eight type supporting structure, which non-contactly installs the intermediate moving knife assembly and the side moving knife assembly in the knife head, makes the central moving knife have up and down floating property, realizes adaptive fitting of the central moving knife with the main knife face, improves cutting efficiency, and avoids the problem of pulling hairs. The surface of the knife head is smooth without edges and burrs, the hair inlet area can be large, and the overall strength is high, which greatly avoids the risk of skin cuts, has better skin feeling, and is convenient to process. The reciprocating knife head adopting the design can be assembled without screws, and even can be connected without glue and thread, is environmentally friendly, has stable connection, clear, compact and reasonable internal structure.

[0013] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the reciprocating knife head of the present application.

[0015] Figure 2 It is an exploded structural schematic diagram of the reciprocating knife head. Figure 1 Figure 3 It is a structural schematic diagram of the moving knife group.

[0016] Figure 4 It is a structural schematic diagram of the intermediate knife assembly.

[0017] Figure 5 It is a structural schematic diagram of the four-corner outer / inner eight type supporting structure. DETAILED DESCRIPTION ​

[0018] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown, an embodiment of the reciprocating cutter head of the present application, a reciprocating cutter head, comprising a cutter holder 3, an outer cutter net 1 integrally formed with the cutter holder 3 and flexible metal sheet, a moving cutter group A in contact with the lower bottom surface of the outer cutter net 1, said moving cutter group is installed in the containing cavity surrounded by the cutter holder and the outer cutter net. Said moving cutter group is installed in the containing cavity surrounded by the cutter holder and the outer cutter net, the reciprocating cutter head of the embodiment is a hammer-shaped cutter head, said outer cutter net 1 is integrally formed and the cross section is curved, that is, the outer cutter net comprises a main cutter surface 11 with an arc-shaped cross section in the length direction, two side inclined cutter surfaces 12 respectively formed by bending inwardly from the two long edges of the main cutter surface 11, and the main cutter surface 11 and the two side inclined cutter surfaces 12 are connected in a circular arc, said main cutter surface 11 and the two side cutter surfaces 12 are provided with skin-friendly groove areas, and a plurality of hair entering grooves are distributed on the skin-friendly groove areas, that is, the skin-friendly groove area on the main cutter surface is provided with a middle skin-friendly groove area 13 in the middle position, and the skin-friendly groove areas on the two side cutter surfaces 12 extend from the connection position with the main cutter surface to the two side cutter surfaces, forming two side edge skin-friendly groove areas 14, or as shown in the embodiment, extending from the front and rear sides of the main cutter surface 11 away from the middle skin-friendly groove area position to the two sides, forming two side edge skin-friendly groove areas. Said moving cutter group comprises a moving cutter seat 4 driven by a transmission member to reciprocate and generally in the shape of T, a middle cutter assembly and a side moving cutter assembly sequentially and superimposedly installed on the moving cutter seat 4 from top to bottom, compared with the existing single unit parallel arrangement, the superimposed installation adopted in the embodiment has no repeated parts, requires small volume, and has compact and clear internal structure, said middle cutter assembly and the middle skin-friendly groove area correspondingly cooperate to realize cutting, the side moving cutter assembly and the two side edge skin-friendly groove areas correspondingly cooperate to realize cutting, said middle cutter assembly comprises a central moving cutter 5 corresponding to the middle skin-friendly groove area, four middle cutter floating elastic pressure members 6 elastically supporting the central moving cutter on the moving cutter seat 4, the lower parts of the four middle cutter floating elastic pressure members 6 pass through the side moving cutter assembly and abut against the moving cutter seat 4, thereby forming a left-right symmetrical four-corner outer / inner eight-type supporting structure under the central moving cutter, and the middle cutter assembly is superimposedly installed above the side moving cutter assembly in the containing groove through the four-corner outer / inner eight-type supporting structure and the side moving cutter assembly. The four-corner outer eight-type supporting structure is shown in the embodiment, the four-corner inner eight-type supporting structure only needs to change the direction of the four middle cutter floating elastic pressure members 6 in the embodiment, and the principle is the same, which will not be repeated here.

[0019] The two groups of moving knives are respectively horizontally positioned and guided upward and downward at the central position and the end side position. That is, the middle knife assembly and the side moving knife assembly of the moving knife group are respectively provided with a horizontal positioning structure matched with the moving knife seat to realize horizontal positioning. The horizontal positioning structure comprises a middle horizontal positioning structure arranged at the middle position of the middle knife assembly and a side end horizontal positioning structure arranged at the left and right end side positions of the side moving knife assembly. The middle horizontal positioning structure comprises a longitudinally extending rail groove 41 arranged at the middle position of the moving knife seat and a supporting guide handle 52 downwardly extended at the middle position of the lower surface of the central moving knife 5. The supporting guide handle is inserted into the rail groove and can slide upward and downward in the rail groove. The free end of the supporting guide rail 52 is in the shape of a large head, which makes the sliding in the rail groove more smooth and reduces friction. The horizontal positioning structure also assists in front and back positioning, avoids front and back shaking and wobbling. In this embodiment, the central moving knife 5 is integrally formed and comprises a long strip knife surface 51 extending in the reciprocating direction and corresponding to the middle rail groove area, and two supporting guide handles 52 downwardly extended at the middle positions of the two horizontal side edges of the long strip knife surface. The two supporting guide handles 52 are arranged in parallel and correspond to the two rail grooves 41 arranged at the middle positions of the front and back side walls of the moving knife seat. A connecting part 53 adapted to the upper part of the middle knife floating elastic compression piece is arranged at the symmetric position of the left and right sides of the two horizontal side edges of the long strip knife surface away from the supporting guide handle. The middle knife floating elastic compression piece is supported on the moving knife seat 4 in the shape of an outer eight elastic support at the fixed four corner positions of the long strip knife surface 51.

[0020] Of course, the horizontal positioning structure can also be arranged at the middle position of the side moving knife assembly and at the left and right end side positions of the middle knife assembly. The middle horizontal positioning structure comprises a longitudinally extending rail groove arranged at the middle position of the moving knife seat and a supporting sliding handle downwardly extended at the middle position of the lower surface of the side moving knife assembly. The supporting sliding handle is inserted into the rail groove and can slide upward and downward in the rail groove. The side end horizontal positioning structure is a buckle groove structure. The buckle groove structure comprises a 7-shaped buckle hook and an inner recess groove movably matched with the longitudinal rib of the 7-shaped buckle hook. The free hook part of the 7-shaped buckle hook limits the inner recess groove and prevents the inner recess groove from coming out.

[0021] The intermediate knife floating elastic pressure piece comprises an upper horizontal part 61 in a horizontal sheet shape and fixedly connected with the connecting part, a bent deformation part 62 extending outward and downward from one end of the upper horizontal part 61, and a lower abutting part 63 abutting on the moving knife holder 4 and having a free end upwardly and outwardly bent. In the free state, the included angle between the upper horizontal part and the bent deformation part 62 of the intermediate knife floating elastic pressure piece is obtuse, and especially the intermediate knife floating elastic pressure piece with an included angle of 105-168 degrees is balanced in the upper pressure and the lower damping limiting capability. In order to make the four-corner outer eight supporting structure formed by the four intermediate knife floating elastic pressure pieces more stable and balanced, a guide limiting block is additionally arranged on the abutting part 63 of the lower friction limiting part on the seat body, and specifically, the moving knife holder is in a T shape and comprises a seat body in a strip shape, a transmission head integrally formed on the lower part of the seat body, an outer arc boss 42 corresponding to the four-corner outer eight supporting structure and outwardly extended from the lateral side of the seat body for guiding and limiting the lower part of the intermediate knife floating elastic pressure piece, and an arc edge limiting side 43 formed on the outer arc boss and abutting on the outer side of the lower abutting part 63, which increases the damping of the lower abutting part and provides a guide for the movement of the lower abutting part 63. In addition, the four outer arc bosses 42 are fixed in position, the four-corner outer eight supporting structure is more balanced, and the center of the four-corner outer eight supporting structure is always on the central axis. That is, the four-corner outer eight supporting structure is balanced in the face of the central moving knife 5 through the guide limiting of the outer arc boss.

[0022] The side moving knife assembly comprises a side moving knife 7 installed below the central moving knife in the accommodating groove and corresponding to the skin groove area of the two side knife faces 12, and a side knife floating elastic pressure piece 8 fixedly installed on the seat body of the moving knife holder 4. The elastic feet on the left and right sides of the side knife floating elastic pressure piece 8 abut on the bottom surface of the side moving knife, so as to realize the close fit of the side moving knife and the skin groove area of the two side knife faces 12. The side moving knife 7 comprises a connecting body 71 extending in a reciprocating direction and connected with the accommodating cavity, and a side knife part 72 corresponding to the skin groove area of the two side knife faces 12 and formed outward from the two lateral edges of the connecting body. The connecting body 71 is provided with a first through hole 73 for the supporting guide handle 52 to pass through and abut on the rail groove 41, and a second through hole 74 for the intermediate knife floating elastic pressure piece to pass through and abut on the seat body of the moving knife holder 4. The second through hole is a long through hole, and the length thereof needs to reach a degree that does not hinder the deformation of the bent deformation part 62.

[0023] The intermediate knife assembly and the side moving knife assembly are both upwardly and downwardly floating, so that the intermediate knife assembly and the side moving knife assembly can be closely fitted with the corresponding skin groove area, the cutting efficiency is improved, and the situation of pulling out the whiskers and missing the whiskers is avoided.

[0024] The outer cutter net 1 of the embodiment is fixedly installed on the cutter holder through the cutter support to ensure the integrity of the outer cutter net 1. The cutter holder is formed by left and right connection of two connection units, and the locking of the split cutter holder after being combined can be realized through interference insertion or buckling structure, but in order to further ensure the stability after being combined, the embodiment further adds a clamping member 8, which is installed on the cutter holder in a full-enclosing or half-enclosing manner, that is, the clamping member 8 at least partially surrounds the left and right two connection units in the transverse direction, so that after the two connection units are inserted and connected into the cutter holder on the left and right sides of the outer cutter net 1 assembled with the cutter support, the two connection units of the cutter holder are locked through the clamping member. The clamping member 8 can be a strip spring, which is exposed outside in the embodiment for the convenience of marking, and of course, can be hidden and buried for the purpose of beauty.

[0025] The static cutter net on the reciprocating cutter head of the present application is not easy to deform, and the thickness of the static cutter net can be less than 10 silk or even 4-5 silk, which is ultra-thin and cannot be realized by other process structures. The sharpness of the cutter head is higher, and the shaving is cleaner, and at the same time, the sufficient supporting force makes it have a longer service life, thereby ensuring the cutting sharpness and safety of the reciprocating cutter head.

[0026] Although the present application has been disclosed as above with specific embodiments, it is not intended to limit the present application, and any person skilled in the art can make some changes and decorations without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be defined by the scope of the appended claims.

Claims

1. A reciprocating tool head comprising a tool holder (3), an outer tool web (1) connected to the tool holder (3), a moving tool group (A) in contact with the lower surface of the outer tool web (1) in a reciprocating manner, said moving tool group being installed in a receiving cavity surrounded by the tool holder and the outer tool web, characterized in that: The outer cutter net (1) is integrally formed and has a curved cross section, that is, the outer cutter net comprises a main cutter face (11) with an arc-shaped cross section in the length direction, two side cutter faces (12) which are respectively inwardly bent downward from the two long sides of the main cutter face (11), and a skin-friendly groove area is arranged on the main cutter face (11) and the two side cutter faces (12), a plurality of hair entering grooves are distributed on the skin-friendly groove area, the moving cutter set comprises a T-shaped moving cutter seat (4) which is driven by a transmission member to reciprocate, a middle cutter assembly and a side moving cutter assembly which are sequentially and vertically arranged on the moving cutter seat (4), the middle cutter assembly is correspondingly matched with the skin-friendly groove area of the main cutter face to realize cutting, the side moving cutter assembly is correspondingly matched with the skin-friendly groove area of the two side cutter faces (12) to realize cutting, the middle cutter assembly comprises a central moving cutter (5) corresponding to the skin-friendly groove area of the main cutter face, a plurality of middle cutter floating elastic supporting members (6) which elastically support the central moving cutter on the moving cutter seat (4), and the lower parts of the plurality of middle cutter floating elastic supporting members (6) pass through the side moving cutter assembly and abut against the moving cutter seat (4), so that a left-right symmetrical four-corner outer / inner eight type supporting structure is formed on the lower bottom of the central moving cutter, and the middle cutter assembly is vertically arranged above the side moving cutter assembly through the four-corner outer / inner eight type supporting structure and the side moving cutter assembly in a non-contact mode.

2. The reciprocating knife head of claim 1, wherein: The middle cutter assembly and the side moving cutter assembly of the moving cutter set are respectively provided with a transverse positioning structure which is matched with the moving cutter seat to realize transverse positioning, the transverse positioning structure comprises a middle transverse positioning structure arranged at the middle position of the middle cutter assembly and a side end transverse positioning structure arranged at the left and right side positions of the side moving cutter assembly, the middle transverse positioning structure comprises a longitudinally extending rail groove (41) arranged at the middle position of the moving cutter seat and a supporting guide handle (52) which is downwardly extended at the middle position of the lower bottom surface of the central moving cutter (5) and is inserted into the rail groove and can slide up and down in the rail groove, and the side end transverse positioning structure is a buckle groove structure, the buckle groove structure comprises a 7-shaped buckle hook and an inner recess groove which is movably matched with the longitudinal rib of the 7-shaped buckle hook, and the free hook part of the 7-shaped buckle hook limits the inner recess groove and prevents the inner recess groove from being pulled out.

3. The reciprocating knife head of claim 2, wherein: The central moving cutter (5) is integrally formed and comprises a long strip cutter face (51) which extends in the reciprocating direction and corresponds to the skin-friendly groove area of the main cutter face, and supporting guide handles which are respectively downwardly extended at the middle positions of the two horizontal side edges of the long strip cutter face and are matched with the rail groove (41).

4. The reciprocating knife head of claim 3, wherein: Coupling parts (53) which are matched with the upper parts of the middle cutter floating elastic supporting members are respectively arranged at the left and right symmetrical positions of the two horizontal side edges of the long strip cutter face, the middle cutter floating elastic supporting members are fixed at the four corner positions of the lower bottom of the long strip cutter face (51) through the coupling parts (53) and are elastically supported on the moving cutter seat (4) in an outer / inner eight type.

5. The reciprocating knife head of claim 4, wherein: The middle cutter floating elastic supporting member comprises an upper horizontal part (61) which is in a horizontal sheet shape and is fixedly matched with the coupling part, a bending deformation part (62) which is outwardly and obliquely extended downward from one end of the upper horizontal part (61), and a lower abutting part (63) which abuts against the moving cutter seat (4) and is upwardly and outwardly inclined at the free end.

6. The reciprocating knife head of claim 1 or 2 or 3 or 4 or 5, wherein: The moving seat is generally T-shaped, including a generally long seat body, a transmission head integrally formed on the lower part of the seat body, and an outer arc boss (42) formed on the seat body and extending outward from the lateral edge of the seat body to serve as a guide and limit for the lower part of the floating spring of the middle blade.

7. The reciprocating knife head of claim 1 or 2 or 3 or 4 or 5, wherein: The side moving blade assembly includes a side moving blade (7) installed below the central moving blade in the accommodating groove and corresponding to the skin groove area of the two side blade surfaces (12), and a side blade floating spring (8) fixedly installed on the seat body of the moving seat (4). The side blade floating spring (8) is arranged on the bottom surface of the side moving blade, thereby achieving the close fit of the side moving blade and the skin groove area of the two side blade surfaces (12). The side moving blade (7) includes a connecting body (71) extending in the reciprocating direction and connected to the accommodating cavity, and a side blade part (72) formed outward from the two lateral edges of the connecting body (71) and corresponding to the skin groove area of the two side blade surfaces (12). A second through hole (74) is formed in the connecting body (71) to allow the middle blade floating spring to pass through and abut against the seat body of the moving seat (4).

8. The reciprocating knife head of claim 6, wherein: The side moving blade assembly includes a side moving blade (7) installed below the central moving blade in the accommodating groove and corresponding to the skin groove area of the two side blade surfaces (12), and a side blade floating spring (8) fixedly installed on the seat body of the moving seat (4). The side blade floating spring (8) is arranged on the bottom surface of the side moving blade, thereby achieving the close fit of the side moving blade and the skin groove area of the two side blade surfaces (12). The side moving blade (7) includes a connecting body (71) extending in the reciprocating direction and connected to the accommodating cavity, and a side blade part (72) formed outward from the two lateral edges of the connecting body (71) and corresponding to the skin groove area of the two side blade surfaces (12). A second through hole (74) is formed in the connecting body (71) to allow the middle blade floating spring to pass through and abut against the seat body of the moving seat (4).

9. The reciprocating knife head of claim 1, wherein: The middle blade assembly and the side moving blade assembly of the moving blade group are respectively provided with a transverse positioning structure for transverse positioning with the moving seat. The transverse positioning structure includes a middle transverse positioning structure arranged at the middle position of the side moving blade assembly, and a side end transverse positioning structure arranged at the left and right end positions of the middle blade assembly. The middle transverse positioning structure includes a rail groove (41) extending longitudinally at the middle position of the moving seat, and a supporting slide handle formed downward at the middle position of the lower bottom surface of the side moving blade assembly, which is inserted into the rail groove and can slide up and down in the rail groove. The side end transverse positioning structure is a buckle groove structure, which includes a 7-shaped buckle hook and an inner recess groove movably connected to the longitudinal rib of the 7-shaped buckle hook. The free hook part of the 7-shaped buckle hook limits the inner recess groove and prevents the inner recess groove from coming out.

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