Reciprocating tool bit assembly with large-angle cutting sector and hair trimming tool

By designing a reciprocating tool head assembly that cuts the fan surface at a large angle, the problem of low surface utilization of the static knife is solved, and the more efficient hair trimming effect of the static knife is achieved and the miniaturization of the tool is achieved.

CN223199080UActive Publication Date: 2025-08-08ZHEJIANG HAISHUN ELECTRIC ENTERPRISES LTD
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Patent Information

Application Number
CN202422462047.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-11
Publication Date
2025-08-08
Estimated Expiration
2034-10-11

AI Technical Summary

Technical Problem

In the existing reciprocating tool head assembly, due to the reduced contact area between the moving knife and the static knife, the surface utilization rate of the static knife is low and the hair extraction efficiency is reduced, so it is impossible to effectively cut the hair that extends out of the cutting fan.

Method used

The reciprocating cutting head assembly is designed to cut the fan with a large angle. By adjusting the structure of the static knife and the static knife, the outer surface of the static knife and the inner surface of the static knife form a cutting fan surface of 60° ≤ S2 ≤ 180°. The static knife and the static knife are always in harmony, and swing back and forth under the action of external force to lift the surface coverage area of the static knife.

Benefits of technology

It effectively improves the surface utilization rate and hair insertion efficiency of the static knife, can cut hair directly above and on both sides of the static knife, improves hair trimming efficiency, and facilitates the miniaturization and carrying of hair trimming tools.

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Abstract

The utility model relates to a reciprocating cutter head assembly with a large-angle cutting sector and a hair trimming tool, which are characterized in that the outer surface of a movable cutter is in contact with the inner surface of a static cutter to form the cutting sector from any one of two ends of the static cutter, and the sector angle S2 of the cutting sector is larger than or equal to 60 degrees and smaller than or equal to 180 degrees. The utility model has the beneficial effects that by increasing the sector angle S2 of the cutting sector between the static cutter and the moving cutter, the covering area of the moving cutter relative to the inner surface of the static cutter is also enlarged, so that the cutting edge of the moving cutter not only can cover the bent part in the middle of the static cutter when swinging back and forth along the inner surface of the static cutter, but also can cover the bent part in the middle of the static cutter; and two sides below the middle bending part of the static cutter can be covered. During use, hair can extend into the static knife from the position over the bent position in the middle of the static knife to be cut off by the blade of the static knife; in addition, the device can simultaneously extend into the static knife from two sides of the middle bent part of the static knife and is cut off by the static knife; the surface utilization rate and the hair feeding benefit of the static cutter are effectively improved, so that the purpose of improving the hair trimming benefit is achieved.
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Description

Technical Field

[0001] The utility model relates to a hair trimming device, more specifically to a reciprocating cutter head assembly with a large-angle cutting fan and a hair trimming tool, which is mainly used in the field of personal care tools such as razors and hair trimmers. Background Art

[0002] like Figures 1 to 3 As shown, the existing reciprocating cutter head assembly includes a stationary blade 1, an inverted U-shaped movable blade 2, a stationary blade holder 11 and a movable blade holder 21 for fixing the stationary blade 1 and the movable blade 2. During use, the U-shaped arc surface of the movable blade is tangent to the inner surface of the stationary blade to form a partial fit, and then the movable blade holder drives the stationary blade to swing back and forth to cut the hair that extends into the stationary blade.

[0003] Since the existing movable blade 2 is in a standard inverted U shape, when the stationary blade 1 is bent and deformed along the U-shaped curved portion of the movable blade 2 during assembly, both sides of the stationary blade 1 need to be fixed to the stationary blade seat 11 to ensure the installation firmness of the stationary blade 1 and to prevent the two sides of the stationary blade 1 from blocking or interfering with the reciprocating swing of the movable blade 2. Therefore, a certain gap must be formed between the two sides of the existing stationary blade 1 and the two sides of the movable blade 2. The gap can effectively prevent the two sides of the stationary blade 1 from blocking or interfering with the reciprocating swing of the movable blade 2. However, increasing the gap will inevitably reduce the contact area between the curved portion in the middle of the stationary blade 1 and the curved portion in the middle of the movable blade 2, so that the contact point between the stationary blade 1 and the movable blade 2 forms a cutting fan S that is less than 60 degrees (such as Figure 3 As shown in FIG, the hair to be cut can only be cut when it enters the hair inlet pores in the cutting sector, while the hair outside the cutting sector cannot be cut, resulting in a low surface utilization rate of the static knife 1 and reducing the hair feeding efficiency of the static knife 1. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a reciprocating cutter head assembly and a hair trimming tool that form a large-angle cutting fan. The reciprocating cutter head assembly can effectively improve the surface utilization rate of the static knife and improve the hair feeding efficiency.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is to form a reciprocating cutter head assembly with a large-angle cutting fan, including a stationary knife and a stationary knife seat on which the stationary knife is installed, as well as a movable knife and a movable knife seat on which the movable knife is installed. The movable knife seat can drive the movable knife and the stationary knife to always keep in contact with each other, and under the action of external force, the movable knife can swing back and forth relative to the stationary knife; from the positive projection direction of either end of the stationary knife or the movable knife, the outer surface of the movable knife contacts the inner surface of the stationary knife to form a cutting fan, and the fan angle S2 of the cutting fan is: 60° ≤ S2 ≤ 180°.

[0006] Preferably, viewed from the orthographic projection direction of either end of the static blade, the width L1 of the upper end of the static blade is greater than the width L2 of the lower end of the static blade, so that the reciprocating cutter head assembly as a whole is mushroom-shaped with a wider upper end and a narrower lower end.

[0007] Preferably, when viewed from the positive projection direction of either end of the stationary knife, the stationary knife includes an arc-shaped portion, a transition portion and a fixed portion. The outer surface of the movable knife contacts the inner surface of the arc-shaped portion to form a cutting fan. The two ends of the transition portion are respectively connected to the arc-shaped portion and the fixed portion, and the fixed portion is respectively connected and fixed to the two side walls of the stationary knife seat; the width on both sides of the arc-shaped portion is greater than the width on both sides of the transition portion and the fixed portion, so that the reciprocating cutter head assembly as a whole is mushroom-shaped, which is wide at the top and narrow at the bottom.

[0008] Preferably, when viewed from the orthographic projection of either end of the movable knife, the movable knife includes a cutting portion, a contraction portion and a fastening portion. The curvature of the cutting portion matches the arc portion and contacts the arc portion to form a cutting fan surface. The fan angle S2 of the cutting fan surface is 150°±5°; the two ends of the contraction portion are respectively connected to the cutting portion and the fastening portion so that the width L3 of the fastening portion is smaller than the width L4 of the cutting portion.

[0009] Preferably, the stationary knife seat includes left and right side plates and end plates connecting the ends of the left and right side plates, and at least two limiting plates are provided at the bottom of the left and right side plates for blocking the bottom of the stationary knife seat; a plurality of riveted columns are provided on the outer side surfaces of the left and right side plates, and the fixed parts in the stationary knife are fixedly connected to the riveted columns respectively, and the arc-shaped part and the transition part cover the upper end of the stationary knife seat so that a space for installing the moving knife seat and the moving knife is formed between the left and right side plates, and the moving knife seat and the moving knife can be swung back and forth in the space and combined with the static knife and the stationary knife seat to form a whole; an elastic member is provided between the limiting plate and the moving knife seat, and the elastic member supports the moving knife seat so that the cutting part in the moving knife and the arc-shaped part in the stationary knife always keep in contact and form a cutting fan.

[0010] Preferably, the outer contour of the end plate is the same as the end face shape of the static knife but slightly larger than the static knife so as to block both ends of the static knife. A protruding arc-shaped limit platform is provided on the inner side surface of each end plate, and the two ends of the arc-shaped portion in the static knife are respectively limited and cooperated with the arc-shaped limit platform.

[0011] Preferably, a guide hole is provided on the inner side surface of each end plate.

[0012] Preferably, the fixing portion is perpendicular and parallel to the central axis of the arc-shaped portion; and the fastening portion is perpendicular and parallel to the central axis of the cutting portion.

[0013] Preferably, a clamping block is provided on the outer side of each end plate, and the clamping block is detachably connected to the body by a buckle.

[0014] On the basis of the above-mentioned reciprocating cutter head assembly with a large-angle cutting fan, the applicant has also proposed a hair trimming tool, which includes the above-mentioned reciprocating cutter head assembly with a large-angle cutting fan.

[0015] The beneficial effect of the present invention is that by increasing the fan-shaped angle S2 of the cutting fan between the static blade and the movable blade, the area covered by the movable blade relative to the inner surface of the static blade is also increased, so that when the blade of the movable blade reciprocates along the inner surface of the static blade, it can not only cover the curved portion in the middle of the static blade, but also cover both sides below the curved portion in the middle of the static blade. In this way, when the reciprocating cutter head assembly is in use, hair can not only be inserted into the static blade from directly above the curved portion in the middle of the static blade and cut by the blade of the movable blade; at the same time, hair can also be inserted into the static blade from both sides of the curved portion in the middle of the static blade and cut by the movable blade at the same time. This effectively improves the surface utilization rate of the static blade and the hair feeding efficiency, thereby improving the hair cutting efficiency of the reciprocating cutter head assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional structural diagram of an existing reciprocating cutter head assembly

[0017] Figure 2 A cross-sectional structural diagram of an existing reciprocating cutter head assembly

[0018] Figure 3 An enlarged cross-sectional view of the dynamic and static blades in a reciprocating cutter head assembly.

[0019] Figure 4 A three-dimensional structural diagram of a reciprocating cutter head assembly with a large-angle cutting fan according to an embodiment of the present invention

[0020] Figure 5 A transverse cross-sectional view of a reciprocating cutter head assembly with a large-angle cutting fan according to an embodiment of the present invention

[0021] Figure 6 A longitudinal cross-sectional view of a reciprocating cutter head assembly with a large-angle cutting fan according to an embodiment of the present invention

[0022] Figure 7 A three-dimensional structural diagram of the static knife in the embodiment of the utility model

[0023] Figure 8 A three-dimensional structural diagram of the movable knife in the embodiment of the utility model

[0024] Figure 9 This is a diagram showing the coordination structure of the static knife and the moving knife in the embodiment of the utility model.

[0025] Figure 10 This is a side view of the static knife in the embodiment of the utility model

[0026] Figure 11 This is a side view of the movable knife in the embodiment of the utility model

[0027] Figure 12This is a top-view three-dimensional structural diagram of the static knife seat in the embodiment of the utility model

[0028] Figure 13 This is a bottom perspective structural diagram of the static knife seat in the embodiment of the utility model DETAILED DESCRIPTION

[0029] The following is combined with Figures 4 to 13 The following further describes the implementation of the present invention:

[0030] The present invention provides a reciprocating blade assembly having a large-angle cutting fan 7, comprising a stationary blade 3 and a stationary blade holder 4 on which the stationary blade 3 is mounted. To facilitate the introduction and trimming of hair, the stationary blade 3 is provided with a plurality of spaced-apart hair inlet holes, through which hair enters the stationary blade 3 during use; a movable blade 5 and a movable blade holder 6 on which the movable blade 5 is mounted. The movable blade holder 6 can drive the movable blade 5 to maintain constant contact with the stationary blade 3, and can also swing back and forth relative to the stationary blade 3 under the action of an external force. The external force is the driving force generated by the rotation of an eccentric wheel mounted on the end of the motor output shaft. The eccentric shaft provided on the eccentric wheel is inserted into a swinging groove in the movable blade holder 6, converting the rotational motion of the eccentric wheel into reciprocating linear motion, thereby driving the movable blade holder 6 and the movable blade 5 to swing back and forth along the inner surface of the stationary blade 3. To improve the hair feeding and trimming efficiency of the reciprocating cutter head assembly, the outer surface of the movable blade 5 contacts the inner surface of the stationary blade 3, forming a cutting fan 7, as viewed from the orthographic projection of either the stationary blade 3 or the movable blade 5. The fan angle S2 of this cutting fan 7 is 60° ≤ S2 ≤ 180°. By increasing the fan angle S2 of the cutting fan 7 between the stationary blade 3 and the movable blade 5, the area covered by the movable blade 5 relative to the inner surface of the stationary blade 3 is also increased. As the blade of the movable blade 5 reciprocates along the inner surface of the stationary blade 3, it not only covers the curved portion in the middle of the stationary blade 3, but also covers both sides below the curved portion in the middle of the stationary blade 3. In this way, when the reciprocating cutter head assembly is in use, the hair can not only be cut by the blade of the passive cutter 5 inserted into the static cutter 3 from just above the middle bend of the static cutter 3; at the same time, the hair can also be cut by the passive cutter 5 by inserting into the static cutter 3 from both sides of the middle bend of the static cutter 3 at the same time; the surface utilization rate and hair feeding efficiency of the static cutter 3 are effectively improved, thereby improving the hair trimming efficiency of the reciprocating cutter head assembly.

[0031] To increase the fan angle S2 of the cutting fan 7 between the stationary blade 3 and the movable blade 5 while preventing the installation and fixation of the stationary blade 3 from interfering with the reciprocating swing of the movable blade 5, the width L1 of the upper end of the stationary blade is greater than the width L2 of the lower end of the stationary blade when viewed from the orthographic projection direction of either end of the stationary blade 3, so that the reciprocating cutter head assembly as a whole has a mushroom shape that is wider at the top and narrower at the bottom. By adjusting the upper and lower ends of the stationary blade 3 to have different widths, when the middle of the stationary blade 3 is bent along the movable blade 5, the lower end of the stationary blade 3 contracts inward, significantly reducing the space occupied by the stationary blade 3 during assembly, facilitating the fixation of the stationary blade 3 to the stationary blade holder 4, and simultaneously giving the reciprocating cutter head assembly a mushroom shape that is wider at the top and narrower at the bottom. While increasing the fan angle S2 of the cutting fan 7 between the stationary blade 3 and the movable blade 5, the lower end of the stationary blade 3 can also prevent interference or obstruction of the reciprocating swing of the movable blade 5 from both sides, thereby not only improving the surface utilization of the stationary blade 3, but also effectively improving the feeding efficiency of the stationary blade 3. Secondly, when the width of the lower end of the static blade 3 becomes narrower, the width of the static blade seat 4 can also be reduced accordingly, thereby reducing the overall width of the reciprocating blade head assembly. In this way, when the reciprocating blade head assembly is assembled with the body of the hair trimming tool, the body of the hair trimming tool can also be reduced synchronously, which facilitates the miniaturization and travel portability of the hair trimming tool and improves the comfort and convenience of use.

[0032] In a specific embodiment, in order to increase the fan angle S2 of the cutting fan 7 between the static knife 3 and the movable knife 5, when viewed from the positive projection direction of either end of the static knife 3, the static knife 3 includes an arc-shaped portion 31, a transition portion 32 and a fixed portion 33. The outer surface of the movable knife 5 contacts the inner surface of the arc-shaped portion 31 to form the cutting fan 7. The two ends of the transition portion 32 are respectively connected to the arc-shaped portion 31 and the fixed portion 33, and the fixed portion 33 is respectively connected and fixed to the two side walls of the static knife seat 4; the width of both sides of the arc-shaped portion 31 is greater than the width of both sides of the transition portion 32 and the fixed portion 33, so that the reciprocating cutter head assembly as a whole is mushroom-shaped, which is wide at the top and narrow at the bottom. In actual production, the static blade 3 is composed of three parts: an arc portion 31, a transition portion 32, and a fixed portion 33. To facilitate the processing and forming of the arc portion 31, the arc portion 31 is a standard semicircular shape. At each end of the arc portion 31, an inwardly inclined and contracted transition portion 32 is connected. The inward inclination of the transition portion 32 is used to contract the width between the fixed portions 33, making the width of the fixed portion 33 smaller than the width of the arc portion 31. This increases the fan angle S2 of the cutting fan 7 between the static blade 3 and the movable blade 5, improving the surface utilization rate and hair feeding efficiency of the static blade 3. It also reduces the width of the static blade holder 4 and the overall size of the reciprocating blade head assembly, facilitating the miniaturization and portability of the hair trimming tool. The width of the arc portion 31 constitutes the upper width L1 of the static blade, and the width of the fixed portion 33 constitutes the lower width L2 of the static blade.

[0033] Because the movable blade 5 reciprocates along the static blade 3 during use to cut hair that has entered the static blade 3, the curved portion 31 at the upper end of the static blade 3 is wider than the fixed portion 33 at the lower end, forming a mushroom-shaped shape that is wider at the top and narrower at the bottom. This narrow fixed portion 33 at the lower end of the static blade 3 has a certain impact on the reciprocating motion of the movable blade 5. In orthographic projection from either end of the movable blade 5, the movable blade 5 comprises a cutting portion 51, a constricting portion 52, and a fastening portion 53. The curvature of the cutting portion 51 matches that of the curved portion 31 and contacts the curved portion 31 to form a cutting fan 7. The contraction portion 52 and the fastening portion 53 are respectively smaller than the transition portion 32 and the fixing portion 33 of the stationary blade 3. In this way, when the cutting portion 51 swings back and forth along the arc portion 31 to cut hair, the transition portion 32 and the fixing portion 33 of the stationary blade 3 will not block or interfere with the contraction portion 52 and the fastening portion 53 of the movable blade 5, thereby ensuring the hair trimming performance of the reciprocating blade head assembly.

[0034] To balance the efficiency of the hair feeding of the static blade 3, improve the surface utilization of the static blade 3, and enhance the hair trimming performance of the combination of the movable blade 5 and the static blade 3, the cutting sector 7 between the cutting portion 51 of the movable blade 5 and the curved portion 31 of the static blade 3 has a sector angle S2 of 150°±5°. The two ends of the contraction portion 52 connect the cutting portion 51 and the fastening portion 53, respectively, such that the fastening portion width L3 is less than the cutting portion width L4. Controlling the sector angle S2 of the cutting sector 7 between the cutting portion 51 of the movable blade 5 and the curved portion 31 of the static blade 3 at 150° not only improves the surface utilization of the static blade 3, enhancing the hair feeding efficiency and hair trimming performance of the static blade 3, but also prevents the shape change at the junction of the curved portion 31 and the transition portion 32 of the static blade 3 from obstructing or interfering with the reciprocating swing of the movable blade 5, thereby ensuring the smooth reciprocating swing of the movable blade 5 along the static blade 3 and the hair trimming performance.

[0035] In order to facilitate the overall assembly and disassembly of the reciprocating blade head assembly relative to the body of the hair trimming tool (not shown in the figure), the static blade seat 4 includes left and right side panels 41 and end panels 42 connecting the ends of the left and right side panels 41. The left and right side panels 41 can be arranged at intervals through the end panels 42 to form a frame structure connected in sequence; at the same time, at least two limiting plates 43 are provided at the bottom of the left and right side panels 41 for blocking the bottom of the frame (i.e., the static blade seat 4); a plurality of rivet columns 44 are provided on the outer side surfaces of the left and right side panels 41. When the static blade 3 is assembled, the fixing portion 33 in the static blade 3 can be respectively hot-melt welded to the rivet columns 44 so that the static blade 3 is fixedly connected to the left and right side panels 41 as a whole. Because the fixed portion 33 of the static blade 3 is connected to the left and right side plates 41, the curved portion 31 and transition portion 32 of the static blade 3 can cover the upper end of the static blade holder 4. With the cooperation of at least two limiting pieces 43 at the bottom of the left and right side plates 41, a movable space for mounting the movable blade holder 6 and the movable blade 5 can be formed between the two end plates 42 and the left and right side plates 41. The movable blade holder 6 and the movable blade 5 can reciprocate along the curved portion 31 of the static blade 3 within this movable space to cut the hair extending into the curved portion 31, thereby achieving hair trimming performance. Under the constraints of the two limiting pieces 43, the movable blade holder 6 and the movable blade 5 can be combined with the static blade holder 4 and the static blade 3 to form a reciprocating blade head assembly that can be assembled and disassembled as a whole.

[0036] To ensure that the cutting portion 51 of the movable blade 5 and the curved portion 31 of the stationary blade 3 maintain constant contact, thereby ensuring the coordinated hair-cutting performance of the stationary blade 3 and the movable blade 5, an elastic member 8 is positioned between the stop plate 43 and the movable blade holder 6. During actual production and assembly, this elastic member 8 is a spring, one end of which presses against the stop plate 43 and the other end rests against the bottom of the movable blade holder 6, ensuring that the cutting portion 51 of the movable blade 5 and the curved portion 31 of the stationary blade 3 maintain constant contact, forming the cutting fan 7. To enhance the spring's operational stability, spring columns can be added to the two stop plates 43 and the movable blade holder 6 to prevent the spring from misaligning or detaching.

[0037] To enhance the overall aesthetics and operational safety of the reciprocating cutter head assembly, the outer profile of the end plates 42 is the same shape as the end face of the static blade 3, but slightly larger than the static blade 3, thereby sealing off both ends of the static blade 3. Setting the shape of the end plates 42 to be the same as the end face of the static blade 3 not only enhances the overall aesthetics of the reciprocating cutter head assembly, but also allows the end plates 42 to seal off both ends of the static blade 3, preventing foreign matter from entering the static blade 3 and hindering the reciprocating swing of the movable blade 5, thereby ensuring the hair trimming performance and operational safety of both the static and movable blades 3 and 5. To minimize the amount of bending deformation of the static blade 3 when subjected to external forces, a protruding arc-shaped stopper 45 is provided on the inner side of each end plate 42. The ends of the arc-shaped portion 31 of the static blade 3 are respectively engaged with the arc-shaped stopper 45 for positional engagement. By arranging a protruding arc-shaped limit platform 45 on the inner side of each end plate 42, when the static knife 3 is assembled, it can be bent based on the arc-shaped limit platform 45 and riveted to the left and right side plates 41 in the static knife seat 4, which not only improves the assembly efficiency of the static knife 3, but also, supported by the arc-shaped limit platform 45, can effectively reduce the bending deformation at both ends of the static knife 3, thereby improving the use safety and hair trimming performance of the static knife 3.

[0038] To facilitate axial floating of the reciprocating cutter head assembly as a whole relative to the body of the hair trimming tool, a guide hole 46 is provided on the inner side of each end plate 42. By providing guide holes 46 on each end plate 42, when the reciprocating cutter head assembly is mounted as a whole on the body of the hair trimming tool, positioning shafts provided on the body can be inserted into the guide holes 46. During use, the reciprocating cutter head assembly, when subjected to external skin pressure, can move vertically up and down along the guide shafts, thereby protecting the static cutter 3 and the movable cutter 5 from external forces and causing breakage. During assembly, a return spring can be added to the guide shaft on the body. When the reciprocating cutter head assembly is forced downward, the return spring automatically resets the reciprocating cutter head assembly when the external force disappears.

[0039] To enhance the bending strength of the stationary blade 3 and the movable blade 5 in a direction perpendicular to their reciprocating swing, the fixed portion 33 is perpendicular and parallel to the central axis of the curved portion 31, while the fastening portion 53 is perpendicular and parallel to the central axis of the cutting portion 51. The parallel arrangement of the fixed portion 33 of the stationary blade 3 and the fastening portion 53 of the movable blade 5 relative to their respective central axes can also be understood as being perpendicular to the reciprocating swing direction. This maximizes the bending strength of the stationary blade 3 and the movable blade 5, minimizing the amount of bending deformation of the stationary blade 3 or the movable blade 5 when subjected to external forces, thereby ensuring the hair cutting performance of the stationary blade 3 and the movable blade 5.

[0040] To facilitate disassembly and assembly of the reciprocating cutter head assembly and the hair trimming tool as a whole, a retaining block 47 is provided on the outer side of each end plate 42. This retaining block 47 is removably connected to the body of the tool. By adding retaining blocks 47 to the outside of each end plate 42, with their lower ends angled for easier insertion and their center width smaller than their ends, these retaining blocks 47 engage with sliders within the tool body when inserted, securing the reciprocating cutter head assembly as a whole to the tool body in a removable manner. This improves assembly and disassembly efficiency.

[0041] On the basis of the above-mentioned reciprocating cutter head assembly, the applicant has also proposed a hair trimming tool, which includes the above-mentioned reciprocating cutter head assembly with a large-angle cutting fan.

[0042] The above embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A reciprocating cutter head assembly with a large-angle cutting fan, comprising a stationary blade and a stationary blade holder for mounting the stationary blade, a movable blade and a movable blade holder for mounting the movable blade, the movable blade holder being capable of driving the movable blade and the stationary blade to always maintain contact, and enabling the movable blade to reciprocate relative to the stationary blade under the action of an external force; characterized in that Viewed from the orthographic projection direction of either end of the static blade or the dynamic blade, the outer surface of the dynamic blade contacts the inner surface of the static blade to form a cutting fan, and the fan angle S2 of the cutting fan is: 60° ≤ S2 ≤ 180°.

2. The reciprocating cutter head assembly having a large-angle cutting fan according to claim 1, characterized in that Viewed from the orthographic projection direction of either end of the static blade, the width L1 of the upper end of the static blade is greater than the width L2 of the lower end of the static blade, so that the reciprocating cutter head assembly as a whole is mushroom-shaped, which is wider at the top and narrower at the bottom.

3. The reciprocating cutter head assembly with a large-angle cutting fan according to claim 1, characterized in that Viewed from the orthographic projection direction of either end of the stationary blade, the stationary blade includes an arc-shaped portion, a transition portion and a fixed portion. The outer surface of the movable blade contacts the inner surface of the arc-shaped portion to form a cutting fan. The two ends of the transition portion are respectively connected to the arc-shaped portion and the fixed portion, and the fixed portion is respectively connected and fixed to the two side walls of the stationary blade seat; the width on both sides of the arc-shaped portion is greater than the width on both sides of the transition portion and the fixed portion, so that the reciprocating blade head assembly as a whole is mushroom-shaped, which is wide at the top and narrow at the bottom.

4. The reciprocating cutter head assembly having a large-angle cutting fan according to claim 3, characterized in that From the orthographic projection of either end of the movable knife, the movable knife includes a cutting part, a contraction part and a fastening part. The curvature of the cutting part matches the arc-shaped part and contacts the arc-shaped part to form a cutting fan surface. The fan angle S2 of the cutting fan surface is 150°±5°; the two ends of the contraction part are respectively connected to the cutting part and the fastening part so that the width L3 of the fastening part is smaller than the width L4 of the cutting part.

5. The reciprocating cutter head assembly having a large-angle cutting fan according to any one of claims 1 to 4, characterized in that The stationary knife seat includes left and right side plates and end plates connecting the ends of the left and right side plates. At least two limiting plates are provided at the bottom of the left and right side plates for blocking the bottom of the stationary knife seat; a plurality of riveted columns are provided side by side on the outer sides of the left and right side plates, and the fixed parts in the stationary knife are fixedly connected to the riveted columns respectively, and the arc-shaped part and the transition part cover the upper end of the stationary knife seat to form a space for installing the moving knife seat and the moving knife between the left and right side plates, and the moving knife seat and the moving knife can be swung back and forth in the space and combined with the stationary knife and the stationary knife seat to form a whole; an elastic member is provided between the limiting plate and the moving knife seat, and the elastic member supports the moving knife seat so that the cutting part in the moving knife and the arc-shaped part in the stationary knife always keep in contact with each other and form a cutting fan.

6. The reciprocating cutter head assembly having a large-angle cutting fan according to claim 5, characterized in that The outer contour of the end plate is the same as the end face shape of the static knife but slightly larger than the static knife, which can block the two ends of the static knife. A protruding arc-shaped limit platform is provided on the inner side of each end plate, and the two ends of the arc-shaped part in the static knife are respectively limited by the arc-shaped limit platform.

7. The reciprocating cutter head assembly having a large-angle cutting fan according to claim 5, characterized in that A guide hole is respectively provided on the inner side surface of each end plate.

8. The reciprocating cutter head assembly with a large-angle cutting fan according to claim 3 or 4, characterized in that The fixing portion is perpendicular and parallel to the central axis of the arc portion; the fastening portion is perpendicular and parallel to the central axis of the cutting portion.

9. The reciprocating cutter head assembly with a large-angle cutting fan according to claim 5, characterized in that A clamping block is provided on the outer side of each end plate, and the clamping block is detachably connected to the machine body by buckles.

10. A hair trimming tool, characterized in that The invention comprises a reciprocating cutter head assembly according to any one of claims 1 to 9, wherein the reciprocating cutter head assembly has a large-angle cutting fan.