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

Abstract

The reciprocating type tool bit assembly is characterized in that the outer surface of a movable cutter makes contact with the inner surface of a static cutter to form the cutting sector when viewed from the orthographic projection direction of any one of the 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 invention has the following beneficial effects: 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 increased, so that when the cutting edge of the moving cutter swings back and forth along the inner surface of the static cutter, not only can the bent part in the middle of the static cutter be covered, but also the two sides below the bent part in the middle 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.

Description

Technical Field

[0001] The present invention relates to a hair trimming device, and more particularly to a reciprocating cutter head assembly with a large-angle cutting fan and a hair trimming tool, which are 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 cutter 1, an inverted U-shaped moving cutter 2, a stationary cutter holder 11 and a moving cutter holder 21 for fixing the stationary cutter 1 and the moving cutter 2. During use, the U-shaped arc surface of the moving cutter is tangent to the inner surface of the stationary cutter to form a partial fit, and then the moving cutter holder drives the stationary cutter to swing back and forth to cut the hair that extends into the stationary cutter.

[0003] Since the existing movable knife 2 is in a standard inverted U shape, when the stationary knife 1 is bent and deformed along the U-shaped curved portion of the movable knife 2 as a reference during assembly, the two sides of the stationary knife 1 need to be fixed on the stationary knife seat 11 to ensure the installation firmness of the stationary knife 1 and to prevent the two sides of the stationary knife 1 from blocking or interfering with the reciprocating swing of the movable knife 2. Therefore, a certain gap must be formed between the two sides of the existing stationary knife 1 and the two sides of the movable knife 2. The gap can effectively prevent the two sides of the stationary knife 1 from blocking or interfering with the reciprocating swing of the movable knife 2. However, after increasing the gap, the contact area between the curved portion in the middle of the stationary knife 1 and the curved portion in the middle of the movable knife 2 will inevitably be reduced, so that the contact point between the stationary knife 1 and the movable knife 2 forms a cutting fan S less than 60° (such as Figure 3 As shown in the figure, the hair to be cut can only be cut in the hair inlet holes 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, thereby reducing the hair inlet efficiency of the static knife 1. Summary of the invention

[0004] In order to solve the above technical problems, the present invention 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 enhance 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 cutter and a stationary cutter seat on which the stationary cutter is installed, as well as a moving cutter and a moving cutter seat on which the moving cutter is installed. The moving cutter seat can drive the moving cutter and the stationary cutter to always keep in contact with each other, and under the action of external force, the moving cutter can swing back and forth relative to the stationary cutter; viewed from the positive projection direction of either end of the stationary cutter or the moving cutter, the outer surface of the moving cutter contacts the inner surface of the stationary cutter 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 stationary blade, 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, so that the reciprocating blade head assembly is mushroom-shaped with a wider upper part and a narrower lower part.

[0007] Preferably, viewed from the direction of the orthographic projection 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.

[0008] Preferably, 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 with the arc portion to form a cutting fan surface, and 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 arranged side by side are provided on the outer sides of the left and right side plates, and the fixed parts in the stationary knife are respectively fixedly connected to the riveted columns, 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 reciprocatingly placed 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.

[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 both ends of the arc-shaped portion in the static knife are respectively limited and cooperated with the arc-shaped limit platform.

[0011] Preferably, guide holes are respectively provided on the inner side surfaces of the end plates.

[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 surface of each end plate, and the clamping block is detachably connected to the body by buckles.

[0014] On the basis of the above-mentioned reciprocating cutter head assembly with a large-angle cutting fan, the applicant also proposes 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 angle S2 of the cutting fan between the static knife and the dynamic knife, the coverage area of ​​the dynamic knife relative to the inner surface of the static knife is also increased, so that when the blade of the dynamic knife reciprocates along the inner surface of the static knife, it can not only cover the curved part in the middle of the static knife, but also cover the two sides below the curved part in the middle of the static knife. In this way, when the reciprocating cutter head assembly is in use, the hair can not only be inserted into the static knife from the top of the curved part in the middle of the static knife and cut by the blade of the passive knife; at the same time, it can also be inserted into the static knife from both sides of the curved part in the middle of the static knife and cut by the passive knife; the surface utilization rate and hair feeding efficiency of the static knife are effectively improved, thereby improving the hair trimming 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 cooperation between the moving knife and the stationary knife in the existing reciprocating knife 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 having 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 having a large-angle cutting fan according to an embodiment of the present invention

[0022] Figure 7 The three-dimensional structure diagram of the static knife in the embodiment of the present invention is

[0023] Figure 8 A three-dimensional structural diagram of the moving knife in an embodiment of the present invention

[0024] Fig. 9 The diagram is a diagram showing the coordination structure of the static knife and the dynamic knife in the embodiment of the present invention.

[0025] Fig.10 The side view of the static knife in the embodiment of the present invention is shown in FIG.

[0026] Fig.11 A side view of the movable knife in an embodiment of the present invention

[0027] Fig.12 The top view of the static knife seat in the embodiment of the present invention is a three-dimensional structural diagram

[0028] Fig.13 The bottom view of the static knife seat in the embodiment of the present invention is a three-dimensional structural diagram DETAILED DESCRIPTION

[0029] The following is combined with Figures 4 to 13 The embodiments of the present invention are further described as follows:

[0030] The present invention is a reciprocating blade assembly with a large-angle cutting fan 7, comprising a stationary blade 3 and a stationary blade seat 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 hair inlet holes arranged at intervals, through which hair enters the stationary blade 3 during use; and a moving blade 5 and a moving blade seat 6 on which the moving blade 5 is mounted, the moving blade seat 6 can drive the moving blade 5 to always keep in contact with the stationary blade 3, and the moving blade 5 can swing back and forth relative to the stationary blade 3 under the action of an external force. The external force refers to the driving force generated by the rotation of an eccentric wheel mounted on the end of the output shaft of the motor, and the eccentric shaft provided on the eccentric wheel is inserted into the swinging groove in the moving blade seat 6, so that the rotational motion of the eccentric wheel is changed into a reciprocating linear motion to drive the moving blade seat 6 and the moving blade 5 to swing back and forth along the inner surface of the stationary blade 3. In order to improve the hair feeding efficiency and hair trimming efficiency of the reciprocating blade assembly, from the orthographic projection direction of either end of the stationary blade 3 or the moving blade 5, the outer surface of the moving blade 5 contacts the inner surface of the stationary blade 3 to form a cutting fan 7, and the fan angle S2 of the 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 moving blade 5, the coverage area of ​​the moving blade 5 relative to the inner surface of the stationary blade 3 is also increased, so that when the blade of the moving blade 5 reciprocates along the inner surface of the stationary blade 3, it can not only cover the curved part in the middle of the stationary blade 3, but also cover the two sides below the curved part in the middle of the stationary blade 3. In this way, when the reciprocating blade assembly is in use, the hair can not only be cut by the blade of the passive blade 5 which extends into the static blade 3 from just above the middle bend of the static blade 3; at the same time, the hair can also be cut by the passive blade 5 which extends into the static blade 3 from both sides of the middle bend of the static blade 3. The surface utilization rate and hair feeding efficiency of the static blade 3 are effectively improved, thereby improving the hair trimming efficiency of the reciprocating blade head assembly.

[0031] In order to increase the fan angle S2 of the cutting fan 7 between the static knife 3 and the moving knife 5 while avoiding the installation and fixation of the static knife 3 from interfering with the reciprocating swing of the moving knife 5, from the positive projection direction of either end of the static knife 3, the width L1 of the upper end of the static knife is greater than the width L2 of the lower end of the static knife, so that the reciprocating cutter head assembly is in a mushroom shape with a wide top and a narrow bottom. By adjusting the upper end and the lower end of the static knife 3 to present different widths, when the middle of the static knife 3 is bent along the moving knife 5, the lower end of the static knife 3 shrinks inward, which can significantly reduce the space occupied by the static knife 3 during assembly, facilitate the fixation of the static knife 3 and the static knife seat 4, and make the reciprocating cutter head assembly in a grinding shape with a wide top and a narrow bottom; under the condition of increasing the fan angle S2 of the cutting fan 7 between the static knife 3 and the moving knife 5, it can also avoid the two sides of the lower end of the static knife 3 from interfering with or blocking the reciprocating swing of the moving knife 5, which not only improves the surface utilization rate of the static knife 3, but also effectively improves the feeding efficiency of the static knife 3. Secondly, when the width of the lower end of the stationary blade 3 becomes narrower, the width of the stationary 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 carrying 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 stationary knife 3 and the moving knife 5, when viewed from the positive projection direction of either end of the stationary knife 3, the stationary knife 3 includes an arc-shaped portion 31, a transition portion 32 and a fixed portion 33. The outer surface of the moving knife 5 contacts the inner surface of the arc-shaped portion 31 to form a 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 stationary 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 the actual production process, the static knife 3 is composed of three parts, namely, the arc portion 31, the transition portion 32 and the fixed portion 33. To facilitate the processing and forming of the arc portion 31, the arc portion 31 is a standard semicircular shape. The transition portions 32 that are inclined inward and contracted are connected at both ends of the arc portion 31. The inward inclination angle of the transition portion 32 is used to contract the width between the fixed portions 33, so that the width of the fixed portion 33 is smaller than the width of the arc portion 31, thereby increasing the fan angle S2 of the cutting fan 7 between the static knife 3 and the moving knife 5, improving the surface utilization rate and hair feeding efficiency of the static knife 3; it can also reduce the width of the static knife seat 4, reduce the overall size of the reciprocating blade assembly, and facilitate the miniaturization and portability of the hair trimming tool. The width of the above-mentioned arc portion 31 constitutes the upper end width L1 of the static knife, and the width of the fixed portion 33 constitutes the lower end width L2 of the static knife.

[0033] Since the movable blade 5 needs to swing back and forth along the stationary blade 3 to cut the hair inserted into the stationary blade 3 when in use, and the width of the arc-shaped portion 31 at the upper end of the stationary blade 3 is greater than the width of the fixed portion 33 at the lower end, forming a mushroom shape with a wide top and a narrow bottom, the narrow fixed portion 33 at the lower end of the stationary blade 3 will have a certain influence on the reciprocating swing of the movable blade 5. In this regard, from the orthographic projection of any end of the movable blade 5, the movable blade 5 includes a cutting portion 51, a contracting portion 52 and a fastening portion 53, and the curvature of the cutting portion 51 matches the arc-shaped portion 31 and contacts the arc-shaped 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 in the stationary blade 3, so that when the cutting portion 51 reciprocates along the arc portion 31 to cut hair, the transition portion 32 and the fixing portion 33 in 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] In order to take into account the hair feeding efficiency of the static knife 3, improve the surface utilization rate of the static knife 3 and the hair trimming performance of the moving knife 5 and the static knife 3, the fan angle S2 of the cutting fan 7 between the cutting portion 51 in the moving knife 5 and the arc portion 31 in the static knife 3 is 150°±5°; the two ends of the contraction portion 52 are respectively connected to the cutting portion 51 and the fastening portion 53 so that the fastening portion width L3 is smaller than the cutting portion width L4. Controlling the fan angle S2 of the cutting fan 7 between the cutting portion 51 in the moving knife 5 and the arc portion 31 in the static knife 3 at 150° can not only improve the surface utilization rate of the static knife 3, but also improve the hair feeding efficiency and hair trimming performance of the static knife 3; at the same time, it can also avoid the shape change at the junction of the arc portion 31 and the transition portion 32 in the static knife 3, which may cause obstruction or interference to the reciprocating swing of the moving knife 5, thereby ensuring the stability of the reciprocating swing of the moving knife 5 along the static knife 3 and the hair trimming performance.

[0035] 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 stationary 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 two end panels 42 to form a frame-shaped structure connected in sequence; at the same time, at least two limit 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 stationary blade seat 4); a plurality of riveted columns 44 are provided on the outer side surfaces of the left and right side panels 41 in a side-by-side manner. When the stationary blade 3 is assembled, the fixing portion 33 in the stationary blade 3 can be respectively hot-melt welded to the riveted columns 44 so that the stationary blade 3 is fixedly connected to the left and right side panels 41 as a whole. Since the fixed portion 33 of the static knife 3 is connected to the left and right side plates 41, the arcuate portion 31 and the transition portion 32 of the static knife 3 can cover the upper end of the static knife seat 4, and with the cooperation of at least two limit pieces 43 at the bottom of the left and right side plates 41, an activity space for installing the movable knife seat 6 and the movable knife 5 can be formed between the two end plates 42 and the left and right side plates 41, and the movable knife seat 6 and the movable knife 5 can reciprocate along the arcuate portion 31 of the static knife 3 in the activity space to cut off the hair extending into the arcuate portion 31, thereby achieving hair trimming performance. Under the restriction of the two limit pieces 43, the movable knife seat 6 and the movable knife 5 can be combined with the static knife seat 4 and the static knife 3 to form a reciprocating knife head assembly that can be assembled and disassembled as a whole.

[0036] In order to ensure that the cutting portion 51 in the movable knife 5 and the arc portion 31 in the stationary knife 3 are always in contact with each other, and to ensure the hair trimming performance of the stationary knife 3 and the movable knife 5, an elastic member 8 is provided between the limit plate 43 and the movable knife seat 6. In the actual production and assembly process, the elastic member 8 is a spring, one end of which is pressed against the limit plate 43, and the other end is supported against the bottom of the movable knife seat 6 so that the cutting portion 51 in the movable knife 5 and the arc portion 31 in the stationary knife 3 are always in contact with each other and form a cutting fan 7. In order to improve the working stability of the spring, a spring column can be additionally provided on the two limit plates 43 and the movable knife seat 6 to prevent the spring from being dislocated or detached.

[0037] In order to improve the overall aesthetics and use safety of the reciprocating blade assembly, the outer contour of the end plate 42 is the same as the end face shape of the static blade 3 but slightly larger than the static blade 3, so that the two ends of the static blade 3 can be blocked. Setting the shape of the two end plates 42 to be the same as the end face shape of the static blade 3 can not only improve the overall aesthetics of the reciprocating blade assembly, but also use the end plate 42 to block the two ends of the static blade 3 to prevent external foreign matter from entering the static blade 3 and hindering the reciprocating swing of the moving blade 5, thereby ensuring the hair trimming performance and use safety of the static blade 3 and the moving blade 5. In order to minimize the amount of bending deformation of the static blade 3 when subjected to external force, a protruding arc-shaped limit platform 45 is provided on the inner side surface of each end plate 42, and the two ends of the arc-shaped portion 31 in the static blade 3 are respectively limited and matched with the arc-shaped limit platform 45. By providing 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 safety of use and hair trimming performance of the static knife 3.

[0038] In order to facilitate the reciprocating cutter head assembly to achieve axial floating relative to the body of the hair trimming tool as a whole, guide holes 46 are respectively provided on the inner side of each end plate 42. By providing the guide holes 46 on each end plate 42, when the reciprocating cutter head assembly is installed on the body of the hair trimming tool as a whole, the positioning shafts provided on the body can be respectively inserted into the guide holes 46. When in use, the reciprocating cutter head assembly can be vertically displaced up and down along the guide shaft when subjected to the squeezing force of the external skin, so as to protect the use safety of the static cutter 3 and the moving cutter 5, and prevent the static cutter 3 from being broken due to the support of the moving cutter 5 due to the external force. When assembling, a reset spring can be added outside the guide shaft on the body, and when the reciprocating cutter head assembly is forced to move downward, the reset spring can automatically reset the reciprocating cutter head assembly when the external force disappears.

[0039] In order to improve the bending strength of the stationary blade 3 and the movable blade 5 in a direction perpendicular to the reciprocating swing direction, the fixing portion 33 is perpendicularly parallel to the central axis of the arc-shaped portion 31; the fastening portion 53 is perpendicularly parallel to the central axis of the cutting portion 51. The fixing portion 33 in the stationary blade 3 and the fastening portion 53 in the movable blade 5 are parallel to the central axis respectively, which can also be understood as the reciprocating swing direction being perpendicular, so that the bending strength of the stationary blade 3 and the movable blade 5 can be improved to the greatest extent, and the bending deformation of the stationary blade 3 or the movable blade 5 when subjected to external force can be reduced as much as possible, thereby ensuring the hair trimming performance of the stationary blade 3 and the movable blade 5.

[0040] In order to facilitate the disassembly and assembly of the reciprocating cutter head assembly as a whole with the hair trimming tool, a clamping block 47 is provided on the outer side of each end plate 42, and the clamping block 47 is detachably connected to the body. By adding a clamping block 47 outside each end plate 42, and the lower end of the clamping block 47 is an inclined surface for easy insertion, and the middle width of the clamping block 47 is smaller than the width at both ends, when the clamping block 47 is inserted into the body, it can cooperate with the slider in the body to detachably connect and fix the reciprocating cutter head assembly as a whole with the body, thereby improving the 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 made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A reciprocating cutter head assembly with a large-angle cutting fan, comprising a stationary cutter and a stationary cutter seat for mounting the stationary cutter, a moving cutter and a moving cutter seat for mounting the moving cutter, the moving cutter seat can drive the moving cutter and the stationary cutter to always keep in contact, and the moving cutter can reciprocate relative to the stationary cutter under the action of an external force; characterized in that Viewed from the orthographic projection direction of either end of the stationary knife or the moving knife, the outer surface of the moving knife contacts the inner surface of the stationary knife to form a cutting fan surface, and the fan angle S2 of the cutting fan surface 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 stationary blade, 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, so that the reciprocating blade head assembly is in the shape of a mushroom that is wider at the top and narrower at the bottom.

3. 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 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 knife head assembly as a whole is mushroom-shaped, which is wide on the top and narrow on 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 portion, a contraction portion and a fastening portion. The curvature of the cutting portion matches the arc-shaped portion and contacts with the arc-shaped portion to form a cutting fan surface, and 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.

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. The fixed parts in the stationary knife are respectively fixedly connected to the riveted columns, 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. The moving knife seat and the moving knife can be reciprocated and placed in the space to form a whole with the stationary knife and the stationary knife seat. 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, 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 both ends of the arc-shaped part in the static knife are respectively limited and matched with the arc-shaped limit platform.

7. The reciprocating cutter head assembly having a large-angle cutting fan according to claim 5, characterized in that Guide holes are respectively arranged on the inner side surface of each end plate.

8. The reciprocating cutter head assembly having 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 having a large-angle cutting fan according to claim 5, characterized in that A clamping block is respectively arranged 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 A reciprocating cutter head assembly comprising any one of claims 1 to 9 and having a large-angle cutting fan.

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