A cutter head assembly with a limiting mechanism and a stationary blade

Abstract

The present invention relates to a cutter head assembly and a stationary blade having a limiting mechanism, characterized in that a limiting mechanism is provided on the inner surface of the stationary blade, a movable blade is placed outside the limiting mechanism and in contact with the limiting mechanism, and under the action of an external force, the cutting teeth of the movable blade abut against the cutting tooth end surface of the stationary blade, and the movable blade can swing back and forth along the limiting mechanism under the drive of the external force. The beneficial effect of the present invention is that a limiting mechanism is provided on the inner surface of the stationary blade, the movable blade is placed outside the limiting mechanism and in contact with the limiting mechanism, and when the external force drives the movable blade to swing back and forth, the limiting mechanism can limit the reciprocating swing direction of the movable blade, effectively preventing the movable blade from being misaligned or deflected at both ends during the swinging process. At the same time, under the restriction of the limiting mechanism, the movable blade can also be prevented from moving up and down, which can greatly improve the working stability of the movable blade and improve the hair trimming efficiency of the cutter head assembly.

Description

Technical Field

[0001] The present invention relates to a hair trimming cutter head assembly, and more particularly to a cutter head assembly with a limiting mechanism and a stationary blade, and is mainly used in the field of hair trimming tools. Background Art

[0002] The cutter head assembly is the primary component of shaving tools, primarily used for trimming and shaving beards and body hair. The trimming or shaving process primarily relies on the reciprocating swing of a moving blade along a stationary blade to cut the beard or body hair. Because existing cutter head assemblies lack a retaining mechanism to constrain the moving blade as it swings back and forth along the stationary blade, the moving blade can easily become misaligned, deflected, or shifted during its reciprocating swing along the stationary blade, affecting the trimming efficiency of the cutter head assembly and damaging the moving and stationary blades.

[0003] Secondly, during the hair trimming process, the cutting teeth on the stationary blade cooperate with the cutting teeth on the movable blade to cut the hair. The hair trimming effect depends primarily on the thickness of the stationary blade's cutting teeth. For example, the thinner the cutting teeth on the stationary blade, the shorter the hair roots remain on the skin surface during trimming, resulting in a cleaner skin surface and a better shaving effect. However, if the stationary blade teeth are thicker, while hair can still be trimmed, the thickness of the cutting teeth affects the hair roots, resulting in a longer length remaining on the skin surface, which in turn reduces the hair trimming effect. Furthermore, since the thickness of existing cutting teeth is the same as that of the stationary blade, to ensure the working strength of the stationary blade, the thickness of the stationary blade and cutting teeth is generally above 0.3 mm. As a result, the hair trimming effect is relatively poor. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a cutter head assembly and a stationary blade with a limiting mechanism. The limiting mechanism can not only limit the reciprocating swing of the movable blade, but also prevent the movable blade from being dislocated, deflected or moved when it swings back and forth along the stationary blade, thereby ensuring the hair trimming efficiency; at the same time, while ensuring the working strength of the stationary blade, the thickness of each cutting tooth in the stationary blade can be reduced, thereby improving the hair trimming effect.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is to include a stationary blade and a movable blade provided with cutting teeth; it also includes a movable blade seat, and a reinforcing pad is provided between the movable blade seat and the movable blade, so that the movable blade seat, the reinforcing pad and the movable blade are synchronously linked; a limiting mechanism is provided on the inner surface of the stationary blade, and the movable blade is placed outside the limiting mechanism and contacts the limiting mechanism. Under the action of external force, the cutting teeth of the movable blade are in contact with the cutting teeth end surface of the stationary blade and the movable blade can swing back and forth along the limiting mechanism under the drive of the external force.

[0006] Preferably, the limiting mechanism is a flat limiting plate, which is fixed to the inner surface of the stationary blade; a limiting hole is provided on the movable blade, the length of the limiting hole is greater than the limiting plate and the side walls of the limiting hole are in contact with the side walls of the limiting plate so that the movable blade can swing back and forth along the limiting plate under the drive of external force.

[0007] Preferably, a limiting block is provided on the side wall of the limiting piece, and the limiting block enables the limiting piece and the side wall of the limiting hole to form line contact or point contact.

[0008] Preferably, at least two protruding arc blocks perpendicular to the swing direction are provided on the side walls on both sides of the limiting plate, and the arc midpoint of each arc block is tangent to the side walls on both sides of the limiting hole to form a vertical line contact, and the arc blocks constitute the limiting blocks.

[0009] Preferably, at least one protruding triangular block with a triangular cross-section is provided on the side walls of both sides of the limiting plate, and one of the acute angles of the triangular block is parallel to the side walls of both sides of the limiting hole and forms a line contact, and the triangular block constitutes the limiting block.

[0010] Preferably, the length of the triangular block is the same as the length of the limiting piece.

[0011] Preferably, at least two spaced-apart triangular blocks are provided on the side walls on both sides of the limiting plate, each triangular block is fixed to the two ends of the side wall of the limiting plate, and one of the acute angles of the triangular block is parallel to the side wall of the limiting hole and forms a line contact.

[0012] Preferably, at least two cones are provided on the side walls on both sides of the limiting piece, and the apex of each cone forms point contact with the side wall corresponding to the limiting hole, and the cones constitute the limiting blocks.

[0013] Preferably, the thickness T1 of the limiting piece and the thickness T2 of the movable blade satisfy the following relationship: 0.5T2 ≤ T1 ≤ 2T 2 。

[0014] Preferably, the movable knife seat is provided with a swing block, and a swing groove is provided on the lower end surface of the swing block, and the swing groove is linked to the driving mechanism; support plates are provided on both sides of the swing block, and at least one positioning column is provided on the upper end surface of each support plate, and each positioning column is respectively inserted into the positioning hole of the movable blade to synchronize the movable blade with the movable knife seat.

[0015] Preferably, a square hole larger than or equal to the limiting hole is provided on the reinforcing pad, and the reinforcing pad fits the upper end surface of the moving blade so that the square hole and the limiting hole coincide with each other; a cylindrical hole with the same diameter as the limiting hole is provided at the corresponding position of the reinforcing pad; a positioning column arranged on the support plate passes through the cylindrical hole and is inserted into the positioning hole so that the moving blade seat, the reinforcing pad and the moving blade are synchronously linked.

[0016] Preferably, a connecting seat with a width less than the length of the square hole and spanning the square hole is provided in the middle of the reinforcing pad, and a concave groove is provided on one end face of the swing block relative to the swing groove. The concave groove cover is placed outside the connecting seat to synchronize and link the reinforcing pad with the movable knife seat.

[0017] Preferably, the connecting seat includes side plates connected to the two side walls of the square hole of the reinforcing pad and perpendicular to the reinforcing pad, and a bridging plate connecting the side plates, arc-shaped positioning plates are symmetrically arranged on both sides of the bridging plate, and a plurality of through holes of different shapes are provided on the bridging plate; arc-shaped cavities are provided on both sides of the concave groove in the swing block of the movable knife seat, the positioning plates are placed in the arc-shaped cavities, and a protruding linkage block matching the shape of the through hole is provided at the bottom of the concave groove and placed in the corresponding through hole.

[0018] Preferably, at least two spring columns are provided on the support plate relative to the other end face where the positioning column is provided, and a pressure spring is respectively sleeved on the spring column, and the other end of the pressure spring is pressed against the stationary blade seat so that the movable blade seat presses the reinforcing pad and fits the cutting teeth of the movable blade with the cutting tooth end face of the stationary blade; the two ends of the stationary blade seat are respectively connected and fixed to the stationary blade so that the movable blade seat, the reinforcing pad and the movable blade can be fixed between the stationary blade and the stationary blade seat so as to swing back and forth.

[0019] Preferably, threaded seats with threaded holes are respectively provided at both ends of the stationary blade, and each threaded seat is fixedly connected to the inner surface of the stationary blade; the stationary blade seat is closed on all sides and has a cavity inside, and screw holes are respectively provided at both ends of the stationary blade seat and are threadedly connected to the threaded seats on the stationary blade through screws so that the moving blade seat and the reinforcement pad can swing back and forth and be connected to the moving blade, and the swing groove of the moving blade seat is placed outside the stationary blade seat.

[0020] In order to improve the hair trimming effect of the cutter head assembly, a technical solution for a static blade is proposed on the basis of the above-mentioned cutter head assembly, which specifically includes a base plate, and a plurality of cutting teeth are arranged side by side at at least one side edge of the base plate to form a tooth group. The tooth group is recessed downward along the outer surface of the base plate so that the outer surface of each cutting tooth in the tooth group is lower than the outer surface of the base plate, and the inner surface protrudes from the inner surface of the base plate, and the edge of the tooth group is connected to the base plate through a step surface; a cutting working surface is provided on the inner surface of the tooth group and the thickness of each cutting tooth in the tooth group is less than the thickness of the base plate.

[0021] Preferably, the thickness of the blade tooth group is greater than or equal to 0.08 mm and less than the thickness of the substrate.

[0022] Preferably, the depth of the tooth group recessed downward along the outer surface of the substrate is less than the thickness of the substrate.

[0023] Preferably, the step surface of the outer surface of the substrate connecting the blade tooth group is inclined, and the inclination angle is ≤75°.

[0024] Preferably, the step differential surface includes a first step differential surface, a second step differential surface and a third step differential surface. The first step differential surface connects the tooth roots of each cutting tooth in the tooth group to the substrate as a whole. The second step differential surface and the third step differential surface connect the two ends of the tooth group to the substrate respectively, and the connection points of the second step differential surface and the third step differential surface with the substrate are respectively 3mm to 5mm away from the edges of the two ends of the substrate.

[0025] Preferably, the second section differential surface and the third section differential surface have the same inclination angle, and the inclination angle is equal to, greater than, or less than the inclination angle of the first section differential surface.

[0026] Preferably, the outer surface of the substrate is arc-shaped in cross section, and the inner surface is a horizontal plane and is lower than the cutting working surface of the tooth group.

[0027] Preferably, the outer surface and the inner surface of the substrate are both horizontal surfaces, and the inner surface is lower than the cutting working surface of the tooth group.

[0028] Preferably, one side of the substrate on which the tooth group is arranged is provided with a bent edge with a height less than or equal to the thickness of the substrate so that the end of each cutting tooth in the tooth group forms a tooth bulge.

[0029] The beneficial effect of the present invention is that a limiting mechanism is provided on the inner surface of the stationary blade, and the movable blade is placed outside the limiting mechanism and in contact with the limiting mechanism. When the external force drives the movable blade to swing back and forth, the limiting mechanism can limit the reciprocating swinging direction of the movable blade, effectively preventing the movable blade from being dislocated or deflected at both ends during the swinging process. At the same time, under the restriction of the limiting mechanism, the movable blade can also be prevented from moving up and down, which can greatly improve the working stability of the movable blade and improve the hair trimming efficiency of the cutter head assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram of a cutter head assembly with a limiting mechanism according to an embodiment of the present invention

[0031] Figure 2 A front view of a cutter head assembly with a limiting mechanism according to an embodiment of the present invention

[0032] Figure 3 for Figure 2 Cross-sectional structural diagram at AA in the middle

[0033] Figure 4 for Figure 2 Cross-sectional structural diagram at the middle BB

[0034] Figure 5 This is a three-dimensional diagram of the assembly of the first embodiment of the movable blade and the limiting mechanism in the embodiment of the present invention

[0035] Figure 6 This is a three-dimensional diagram of the assembly of the second embodiment of the movable blade and the limiting mechanism in the embodiment of the present invention

[0036] Figure 7 This is a three-dimensional diagram of the assembly of the third embodiment of the movable blade and the limiting mechanism in the embodiment of the present invention

[0037] Figure 8 This is an assembly diagram of the movable blade holder, reinforcement pad, movable blade, and stationary blade in an embodiment of the present invention.

[0038] Figure 9 A three-dimensional structural diagram of a reinforcement pad according to an embodiment of the present invention

[0039] Figure 10 This is a front view of the three-dimensional structure of the movable knife seat in the embodiment of the present invention

[0040] Figure 11 This is a bottom perspective structural diagram of the movable knife seat in an embodiment of the present invention.

[0041] Figure 12 An exploded structural diagram of a cutter head assembly with a limiting mechanism according to an embodiment of the present invention

[0042] Figure 13 This is a front view of a three-dimensional structure of a static blade according to an embodiment of the present invention.

[0043] Figure 14 A bottom perspective structural diagram of a static blade according to an embodiment of the present invention

[0044] Figure 15 A cross-sectional structural diagram of a stationary blade according to an embodiment of the present invention

[0045] Figure 16 A cross-sectional structural diagram of a second embodiment of a stationary blade according to an embodiment of the present invention DETAILED DESCRIPTION

[0046] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0047] like Figures 1 to 12As shown, the present invention is a cutter head assembly with a limiting mechanism, comprising a stationary blade 1 having cutting teeth 31 and a movable blade 2. Under the action of an external force, the cutting teeth 31 of the movable blade 2 engage the end faces of the cutting teeth 31 of the stationary blade 1. When hair enters the cutting teeth 31 of the stationary blade 1, the cutting teeth 31 of the movable blade 2 cut the hair, achieving hair trimming and shaving. To prevent the movable blade 2 from misaligning, deflecting, or moving when it reciprocates along the stationary blade 1 under the drive mechanism, a limiting mechanism 4 is provided on the inner surface of the stationary blade 1. The movable blade 2 is positioned outside the limiting mechanism 4 and contacts the limiting mechanism 4. When an external force drives the movable blade 2 to reciprocate, the limiting mechanism 4 limits the reciprocating direction of the movable blade 2, effectively preventing misalignment or deflection at either end of the movable blade 2 during the swinging process. Furthermore, the limiting mechanism 4 also prevents the movable blade 2 from moving up and down, greatly improving the operating stability of the movable blade 2 and enhancing the hair trimming efficiency of the cutter head assembly.

[0048] Since the cutter head assembly is generally small, to facilitate the production and assembly of the limiting mechanism 4, improve production efficiency and assembly costs, the limiting mechanism 4 is a flat limiting plate 41 fixed to the inner surface of the stationary blade 1. The flat shape of the limiting mechanism 4 allows it to be directly formed in a single step through a stamping process during production, resulting in an extremely simple structure. This not only improves production efficiency, but also allows the limiting plate 41 to be quickly fixed to the inner surface of the stationary blade 1 during assembly using adhesives or spot welding, significantly improving the assembly efficiency of the stationary blade 1 and reducing production costs. To facilitate the limiting plate 41 in limiting the reciprocating direction of the movable blade 2, a limiting hole 21 is provided in the movable blade 2. The side walls of the limiting plate 41 contact each other, allowing the movable blade 2 to reciprocate along the limiting plate 41 under external force. By providing the limiting hole 21 in the limiting plate 41 and ensuring that the side walls of the limiting hole 21 contact the corresponding side walls of the limiting plate 41, the limiting plate 41 is provided with a limiting hole 21. When the movable blade 2 swings back and forth driven by the drive mechanism, the sidewalls of the limiting plate 41 can restrict the sidewalls of the limiting hole 21, effectively preventing the movable blade 2 from misaligning, deflecting, or moving at both ends as it swings back and forth along the stationary blade 1, thereby ensuring the operating stability of the movable blade 2. To ensure hair trimming performance when the movable blade 2 swings back and forth along the stationary blade 1, the limiting hole 21 is longer than the limiting plate 41. Moreover, the limiting plate 41 is located in the middle of the limiting hole 21, forming a swing space at both ends of the limiting hole 21. The length of the swing space is greater than the left and right swing stroke of the movable blade 2.

[0049] To reduce frictional resistance between the limiting plate 41 and the limiting hole 21 in the movable blade 2, thereby reducing the temperature rise of the movable blade 2 and the stationary blade 1 (which refers to the increase in surface temperature of the movable blade 2 and the stationary blade 1 due to frictional heat, which reduces skin comfort or even burns the skin during hair trimming) and operating noise, a limiting block 42 is provided on the side wall of the limiting plate 41. The limiting block 42 enables the limiting plate 41 to form line contact or point contact with the side wall of the limiting hole 21. By adding the limiting block 42 to the side wall where the limiting plate 41 contacts the limiting hole 21, the limiting block 42 forms line contact or point contact with the corresponding side wall of the limiting hole 21. This not only reduces the material usage of the limiting plate 41 and reduces material costs; it also greatly reduces the contact area between the limiting hole 21 and the limiting plate 41 during assembly of the cutter head assembly, significantly reducing frictional resistance between the movable blade 2 and the limiting plate 41, reducing the temperature rise and operating noise of the movable blade 2 and the stationary blade 1, and improving the user comfort of the cutter head assembly.

[0050] like Figures 5-7 As shown, to optimize the structure of the stopper 41, facilitate production, processing, and assembly, and reduce the frictional resistance between the movable blade 2 and the stopper 41, at least two protruding arc blocks are provided on the side walls of the stopper 41, each of which is perpendicular to the swing direction. The arc midpoint of each arc block is tangent to the side walls of the stopper hole 21 to form a vertical line contact. The arc blocks constitute the stopper 42. An arc block is provided at each end of the side wall of the stopper 41. The arc block is perpendicular to the swing direction of the movable blade 2, and can also be considered perpendicular to the thickness direction of the stopper 41. This structure allows for a single-step forming process during production through a stamping process, reducing the material of the stopper 41 and improving the production efficiency of the stopper 41. Secondly, by utilizing the arc blocks perpendicular to the swing direction of the movable blade 2, when the cutter head assembly is in operation, the arc midpoints of the arc blocks form a line contact with the side walls corresponding to the stopper hole 21 of the movable blade 2, thereby reducing the contact area between the stopper hole 21 of the movable blade 2 and the stopper 41. When the contact area is reduced, the frictional resistance between the movable blade 2 and the limiting plate 41 is also reduced, which in turn reduces the temperature rise of the movable blade 2 and the stationary blade 1, and improves the comfort of the cutter head assembly during use. In actual production, the arc block can also be directly set on the side wall corresponding to the limiting hole 21, using the side wall of the limiting block 42 to contact the arc midpoint of the arc block. This can also achieve the same technical purpose and produce the same technical effect. The specific requirements can be determined according to customer requirements or actual needs.

[0051] Of course, in actual production, a line contact structure parallel to the swing direction of the movable blade 2 can also be used. Figure 6As shown, at least one protruding triangular block with a triangular cross-section is provided on the side walls on both sides of the limiting plate 41. One of the sharp-angled sides of the triangular block is parallel to the side walls on both sides of the limiting hole 21 and forms a line contact. The triangular block constitutes the limiting block 42. The length of the triangular block can be the same as the length of the limiting plate 41, or two triangular blocks can be provided at both ends of the side walls on both sides of the limiting plate 41. With this structure, the contact area between the movable blade 2 and the limiting plate 41 can also be reduced, thereby reducing the frictional resistance between the movable blade 2 and the limiting plate 41. However, since one of the sharp-angled sides of the triangular block is parallel to the limiting block 42 and forms a line contact, the limiting plate 41 and the triangular block cannot be stamped into shape at one time due to the influence of the angle of the sharp-angled side during production. The production difficulty is greater than that of the arc block. Therefore, providing arc blocks at both ends of both sides of the limiting plate 41 is a preferred embodiment.

[0052] In addition to the vertical line contact and horizontal line contact mentioned above, a point contact structure can also be adopted between the limiting hole 21 of the movable blade 2 and the limiting piece 41. Figure 7 As shown, at least two cones are provided on the sidewalls of the limiting plate 41. The apex of each cone forms point contact with the corresponding sidewall of the limiting hole 21. These cones constitute the limiting blocks 42. This also serves to reduce the contact area between the movable blade 2 and the limiting plate 41, thereby lowering frictional resistance and operating temperature rise. However, providing cones on the sidewalls of the limiting plate 41 is difficult to manufacture and is relatively challenging. Therefore, the use of arc-shaped blocks perpendicular to the swing direction of the movable blade 2 is the preferred embodiment.

[0053] To ensure the working stability of the movable blade 2 and prevent the movable blade 2 from being dislocated, deflected, or moved during the reciprocating swing process, the thickness T1 of the limit plate and the thickness T2 of the movable blade satisfy the following relationship: 0.5T2 ≤ T1 ≤ 2T2. The thickness T1 of the limit plate is preferably 1T2 so that the thickness of the limit plate 41 is the same as that of the movable blade 2. In this way, when the movable blade 2 swings back and forth, the limit plate 41 can not only limit the reciprocating swing direction of the movable blade 2, but also use the thickness of the limit plate 41 to prevent the movable blade 2 from separating from the limit plate 41 when it moves up and down, thereby ensuring the working stability of the movable blade 2. Of course, in order to reduce production costs, the thickness of the limit plate 41 can also be set to half the thickness of the movable blade 2. However, reducing the thickness of the limit plate 41 makes it easier for the movable blade 2 to separate from the limit plate 41 when it moves up and down. Therefore, the thickness of the limit plate 41 is preferably the same as that of the movable blade 2. Secondly, from the perspective of the technical purpose and technical effect to be achieved, the thicker the limit plate 41 is, the better. For example, the thickness of the limit plate 41 is twice the thickness of the moving blade 2. Although this can absolutely prevent the moving blade 2 from being dislocated, deflected, and moving up and down when it swings back and forth, the increase in the thickness of the limit plate 41 will correspondingly increase the material cost of the limit plate 41 and the production cost of the cutter head assembly. Therefore, the implementation method of this embodiment is the preferred implementation method.

[0054] To ensure the hair trimming performance of the cutter head assembly and facilitate the reciprocating swing of the movable blade 2, the cutter head assembly also includes a movable blade holder 5, which is provided with a swing block 51. The lower end surface of the swing block 51 is provided with a swing groove 52, and the swing groove 52 is interlocked with the drive mechanism. By providing the swing groove 52 on the lower end surface of the swing block 51, the swing groove 52 can be interlocked with the drive mechanism of the shaving tool after the cutter head assembly is assembled with the shaving tool. The high-speed rotation of the eccentric shaft of the drive mechanism drives the movable blade 2 to swing back and forth, thereby achieving hair trimming. Because the drive mechanism and eccentric shaft of the shaving tool are conventional prior art, and this application does not involve improvements to the drive mechanism and eccentric shaft, the drive mechanism and eccentric shaft structure will not be described in detail here. To ensure synchronous linkage between the movable blade 2 and the movable blade holder 5, support plates 53 are provided on either side of the swing block 51. Each support plate 53 has at least one positioning post 54 on its upper end surface. Each positioning post 54 is inserted into the positioning hole 23 of the movable blade 2, ensuring synchronous linkage between the movable blade 2 and the movable blade holder 5. By providing support plates 53 on either side of the swing block 51 and positioning posts 54 on each support plate 53, during assembly, the positioning posts 54 are inserted into the positioning holes 23 of the movable blade 2 to achieve a linkage connection between the movable blade 2 and the movable blade holder 5. When the movable blade holder 5 reciprocates under the drive mechanism, the positioning posts 54 cooperate with the positioning holes 23 to cause the movable blade 2 to reciprocate synchronously with the movable blade holder 5 along the stationary blade 1, achieving hair trimming. In actual production, the swing block 51, swing groove 52, support plates 53, and positioning posts 54 form a single-piece structure, integrally formed by injection molding.

[0055] Since the movable blade 2 is relatively thin, in order to prevent the movable blade 2 from being twisted or deformed by the force when it swings back and forth driven by the positioning column 54 of the movable blade seat 5, a reinforcement pad 6 is provided between the movable blade 2 and the movable blade seat 5. The reinforcement pad 6 is provided with a square hole 61 that is larger than or equal to the limiting hole 21. The reinforcement pad 6 fits the upper end surface of the movable blade 2 so that the square hole 61 coincides with the limiting hole 21; a cylindrical hole 62 with the same diameter as the limiting hole 21 is provided at the corresponding position of the reinforcement pad 6; the positioning column 54 provided on the support plate 53 passes through the cylindrical hole 62 and is inserted into the positioning hole 23 so that the movable blade seat 5, the reinforcement pad 6 and the movable blade 2 are synchronously linked. By providing a reinforcing pad 6 between the movable blade holder 5 and the movable blade 2, the positioning column 54 on the support plate 53 passes through the cylindrical hole 62 on the reinforcing pad 6 and is inserted into the positioning hole 23. When the movable blade holder 5 is driven by the driving mechanism to swing back and forth, the driving force originally applied by the positioning column 54 to the movable blade 2 can be decomposed into the reinforcing pad 6 and the movable blade 2, thereby reducing the force borne by the movable blade 2, effectively preventing the movable blade 2 from twisting or deforming during the reciprocating swing, and ensuring the working stability of the movable blade 2. Secondly, during production, the reinforcing pad 6 is a planar body whose width and length are slightly larger than the limiting hole 21 of the movable blade 2 and is in contact with the end face of the movable blade 2. To prevent the reciprocating swing of the movable blade 2 from being affected, a square hole 61 matching the limiting hole 21 is provided in the middle of the reinforcing pad 6. In this way, when the thickness of the limiting plate 41 is equal to or greater than the thickness of the movable blade 2, the end face of the limiting plate 41 can be prevented from contacting the reinforcing pad 6, thereby improving the working stability of the movable blade 2. From the perspective of actual use, the reinforcing pad 6 can also be omitted. For example, the thickness of the movable blade 2 can be directly increased to improve the bending strength of the movable blade 2, which can also achieve the same purpose. However, increasing the thickness of the movable blade 2 not only increases the material cost of the movable blade 2; in addition, the positioning column 54 on the movable blade holder 5 that drives the movable blade 2 to swing back and forth synchronously is also prone to breakage. Therefore, providing a separate reinforcing pad 6 is a preferred embodiment. It can improve the bending strength of the movable blade 2 while minimizing the increase in material cost. In addition, by adding a corresponding structure to the reinforcing pad 6, the positioning column 54 on the movable blade holder 5 can be prevented from being broken by stress, thereby improving the safety and working stability of the cutter head assembly.

[0056] To prevent the positioning post 54 of the movable blade holder 5 from breaking under stress when the movable blade 2 and the reinforcing pad 6 are driven to swing back and forth, a connecting seat 63 is provided in the middle of the reinforcing pad 6, the width of which is less than the length of the square hole 61 and which spans the square hole 61. A concave groove 55 is provided on the swing block 51 on one end surface opposite the swing groove 52. The concave groove 55 covers the connecting seat 63, thereby synchronously connecting the reinforcing pad 6 to the movable blade holder 5. By providing the connecting seat 63 in the middle of the square hole 61 of the reinforcing pad 6 and spanning the square hole 61, during assembly, the concave groove 55 on the swing block 51 can be snapped into the connecting seat 63, forming a mechanical limit between the reinforcing pad 6 and the movable blade holder 5. When the driving mechanism drives the movable blade holder 5 to swing back and forth, the swinging force of the movable blade holder 5 mainly acts on the concave groove 55 and the connecting seat 63. This reduces the force on the positioning post 54 on the support plate 53, effectively preventing the positioning post 54 on the support plate 53 from breaking under stress, thereby ensuring the working stability of the movable blade 2. In the actual production process, the side plate 631 and the bridge plate 632 of the connecting seat 63 are integrated with the reinforcing pad 6 and are formed by stamping to improve the working strength of the reinforcing pad 6.

[0057] When the movable knife seat 5 drives the movable blade 2 to swing back and forth, in order to prevent the positioning column 54 from being broken by the force and to facilitate the assembly and positioning of the movable knife seat 5, the connecting seat 63 includes a side plate 631 connected to the two side walls of the square hole 61 of the reinforcing pad 6 and perpendicular to the reinforcing pad 6, and a bridge plate 632 connecting the side plates 631, arc-shaped positioning pieces 633 are symmetrically arranged on both sides of the bridge plate 632, and a plurality of through holes 634 of different shapes are provided on the bridge plate 632; arc-shaped cavities 551 are provided on both sides of the concave groove 55 in the swing block 51 of the movable knife seat 5, the positioning piece 633 is placed in the arc-shaped cavity 551, and a protruding linkage block 552 matching the shape of the through hole 634 is provided at the bottom of the concave groove 55 and placed in the corresponding through hole 634. By adding arc-shaped positioning pieces 633 on both sides of the bridge plate 632, when the movable knife seat 5 is assembled, the arc-shaped positioning pieces 633 cooperate with the arc-shaped cavities 551 on both sides of the concave groove 55 to quickly and accurately position the movable knife seat 5 and the connecting seat 63 of the reinforcing pad 6, thereby improving assembly efficiency. Multiple linkage blocks 552 with different cross-sections are used at the bottom of the concave groove 55 and inserted into corresponding through-holes 634 on the bridge plate 632. When the driving mechanism drives the movable knife seat 5 to swing back and forth, the swinging force is dispersed to each linkage block 552 and is not concentrated entirely on the positioning column 54 on the support plate 53. This effectively prevents the positioning column 54 from being excessively stressed and breaking, thereby improving the safety and operational stability of the movable knife assembly.

[0058] In order to ensure that the end faces of the cutting teeth 31 in the movable blade 2 and the cutting teeth 31 in the stationary blade 1 are always in contact with each other, thereby ensuring the hair trimming performance, at least two spring columns 56 are provided on the support plate 53 relative to the other end face where the positioning column 54 is provided, and a pressure spring 7 is respectively sleeved on the spring column 56. The other end of the pressure spring 7 is pressed against the stationary blade seat 8 so that the movable blade seat 5 presses the reinforcement pad 6 and makes the cutting teeth 31 of the movable blade 2 and the end faces of the cutting teeth 31 of the stationary blade 1 contact with each other; the two ends of the stationary blade seat 8 are respectively connected and fixed to the stationary blade 1 so that the movable blade seat 5, the reinforcement pad 6 and the movable blade 2 can be fixed between the stationary blade 1 and the stationary blade seat 8 so as to swing back and forth. By adding a pressure spring 7 between the support plate 53 and the stationary blade seat 8, one end of the pressure spring 7 is pressed against the stationary blade seat 8, and the other end is pressed against the support plate 53. In this way, the elastic force of the pressure spring 7 can compress the support plate 53 of the movable blade seat 5 to apply the extrusion force of the spring to the reinforcing pad 6 and the movable blade 2, so that the cutting teeth 31 of the movable blade 2 and the cutting teeth 31 of the stationary blade 1 are always in an end-face fitting state, thereby ensuring the hair trimming performance of the cutter head assembly.

[0059] To facilitate assembly of the cutter head assembly and ensure operational stability of the movable blade 2 and movable blade holder 5, threaded seats 9 with threaded holes are provided at both ends of the stationary blade 1. Each threaded seat 9 is fixedly connected to the inner surface of the stationary blade 1. The stationary blade holder 8 is enclosed on all sides and has an internal cavity. Screw holes 81 are provided at both ends of the stationary blade holder 8 and are threadedly connected to the threaded seats 9 on the stationary blade 1 via screws 82, allowing the movable blade holder 5 and the reinforcing pad 6 to swing back and forth and connect to the movable blade 2. The swinging groove 52 of the movable blade holder 5 is located outside the stationary blade holder 8. Threaded seats 9 are provided at both ends of the inner surface of the stationary blade 1. During assembly, the stationary blade holder 8 can be fixed to the stationary blade 1 by connecting the screws 82 to the threaded seats 9. Unlike the traditional method of inserting the stationary blade 1 into the slot of the stationary blade holder 8, this installation method is not only simple in structure and easy to produce and assemble, but also effectively prevents the stationary blade 1 from sliding left and right along the slot of the stationary blade holder 8, thereby ensuring the hair trimming performance of the cutter head assembly. The stationary knife seat 8 is closed on all sides to form a cavity. During the assembly process, the reinforcing pad 6, the movable knife seat 5, and the pressure spring 7 can be placed in the cavity and swing back and forth. The swing groove 52 of the movable knife seat 5 can pass through the stationary knife seat 8 and be linked to the driving mechanism in the shaving tool.

[0060] In order to improve the hair trimming effect of the cutter head assembly, a technical solution of a static blade is proposed based on the above cutter head assembly, such as Figures 13-16As shown, the blade 1 specifically includes a base plate 11, and a plurality of cutting teeth 31 arranged side by side on at least one side edge of the base plate 11 to form a tooth group 3. Existing stationary blades 1 generally utilize open-type cutting teeth 31, i.e., the tooth tips are independent entities, while the tooth roots are connected to the base plate 11. The tooth group 3 consists of a plurality of cutting teeth 31 spaced apart in a single direction. Because the inner and outer end surfaces of the existing cutting teeth 31 are located on the same plane or curved surface as the inner and outer end surfaces of the base plate 11, the thickness of the cutting teeth 31 is the same as that of the base plate 11. To ensure the operational strength of the stationary blade 1, the thickness of the existing stationary blade 1 is generally greater than 0.3 mm. While this meets the strength requirements, it also results in a relatively thick cutting tooth 31. During hair trimming, the thickness of the cutting teeth 31 affects the residual length of the hair roots on the skin, resulting in an incomplete shaving and failing to meet the user's requirements. To address the aforementioned technical issues, the present invention utilizes a stamping process to recess the entire tooth set 3 downward along the outer surface of the substrate 11. This allows the outer surface of each cutting tooth 31 to be lower than the outer surface of the substrate 11, while the inner surface protrudes above the inner surface. Furthermore, a stepped surface 12 is formed between the root of the cutting tooth 31 and the outer and inner surfaces of the substrate 11. The inner surface of the tooth set 3 protruding from the inner surface of the substrate 11 is then ground using a grinding process to form a cutting surface 13. The thickness of each cutting tooth 31 in the tooth set 3 is reduced to less than the thickness of the substrate 11. This significantly improves the overall flatness of the cutting surface 13 of the tooth set 3, reduces friction between the moving blade 2 and the stationary blade 1 during use, and lowers the temperature rise of the stationary and moving blades 1. Furthermore, it minimizes the thickness of each cutting tooth 31 in the tooth set 3. As is well known, the thinner the stationary blade 1, the shorter the hair roots remain on the skin during shaving, resulting in a better shaving effect. Since only the tooth group 3 in the stationary blade 1 is ground to reduce the thickness of each cutting tooth 31 in the tooth group 3 , while the substrate 11 is not affected, the working strength of the stationary blade 1 can be effectively guaranteed.

[0061] like Figure 15 As shown, to reduce the production difficulty of the stationary blade 1, during the actual grinding process, the inner surface of the tooth group 3 and the step surface 12 connecting to the inner surface of the tooth group 3 are ground together to form an integrated cutting working surface 13 slightly higher than the inner surface of the substrate 11. This facilitates assembly of the movable blade 2, reduces the contact area between the movable blade 2 and the stationary blade 1, reduces friction, and lowers temperature rise. Furthermore, the step surface 12 connecting the roots of the cutting teeth 31 in the tooth group 3 is gradually widened from a narrow width, preventing stress concentration at the connection between the roots of each cutting tooth 31 and the step surface 12, which could cause the cutting teeth 31 to break under stress, thereby ensuring the working strength and service life of each cutting tooth 31 in the tooth group 3.

[0062] Of course, during the grinding operation, only the inner surface of each cutting tooth 31 in the tooth group 3 may be ground to reduce the thickness of each cutting tooth 31, such as Figure 16 However, such grinding will cause the stepped surface 12 connecting the roots of the cutting teeth 31 to be higher than the cutting working surface 13 of the tooth group 3, which is not only detrimental to the assembly of the movable blade 2, but also prone to fracture at the connection between the roots of the cutting teeth 31 of the tooth group 3 and the stepped surface 12, which correspondingly reduces the service life of the stationary blade 1. Therefore, grinding the inner surface of the tooth group 3 as a whole is the preferred embodiment.

[0063] In order to improve the hair shaving effect of the static blade 1, the thickness T3 of the tooth group (which can also be regarded as the thickness of each cutting tooth 31 on the static blade 1) is greater than or equal to 0.08 mm and less than the substrate thickness T4. The substrate thickness T4 is between 0.3 mm and 2 mm. In actual use, it will be selected according to different purposes. For example, the substrate thickness T4 of the static blade 1 used in the shaving field is preferably between 0.35 and 0.5 mm. The substrate thickness T4 of the static blade 1 used in the hairdressing field can be increased accordingly, basically above 0.5 mm, and the specific selection can be determined according to the structure of the static blade 1. Under normal circumstances, the substrate thickness T4 of the static blade 1 used in the shaving field is preferably processed with 0.35 mm sheet material, which can minimize the production cost while ensuring the working strength of the static blade 1. In theory, the thinner the thickness T3 of the tooth group, the better the hair shaving effect of the static blade 1. In order to prevent the cutting teeth 31 in the tooth set 3 from being deformed or broken, thereby affecting the shaving effect, the thickness T3 of the tooth set 3 can also be determined according to the hardness of the substrate 11 .

[0064] For example:

[0065] When the hardness of the substrate 11 is between HRC52 and HRC55, the thickness T3 of the tooth group (which can also be considered the thickness of each cutting tooth 31) is preferably 0.13 mm ± 0.03 mm. This prevents deformation, distortion, or breakage of the cutting teeth 31 when hair enters the adjacent hair guide groove, ensuring the working stability of each cutting tooth 31 and improving the hair trimming effect.

[0066] When the hardness of the substrate 11 is less than HRC52, the toughness of the substrate 11 is improved, and the thickness T3 of the tooth group can be set to 0.10 mm or less, thereby preventing the cutting teeth 31 in the tooth group 3 from being deformed, twisted or broken.

[0067] When the hardness of the substrate 11 is greater than HRC55, the toughness of the substrate 11 is reduced accordingly, but its brittleness is increased accordingly. In order to prevent the cutting teeth 31 in the tooth group 3 from cracking or breaking, the thickness T3 of the tooth group can be increased accordingly. For example, the thickness T3 of the tooth group can be set to one half, two thirds or three quarters of the substrate thickness T4 to ensure the performance of the static blade 1.

[0068] The thickness T3 of the blade teeth group can be flexibly set according to the different materials and hardness of the substrate 11, and this embodiment does not impose any further restrictions.

[0069] To improve the fit of the stationary blade 1 against the skin during hair trimming and enhance the comfort of shaving, the tooth group 3 is recessed downward along the outer surface of the substrate 11 to a depth T5 that is less than the substrate thickness T4. Setting the recessed depth T5 of the tooth group 3 to be less than the substrate thickness T4 allows the thickness T3 of the tooth group 3 to be reduced to the greatest extent possible during grinding of the inner surface of the tooth group 3. The support connection provided by the step surface 12 also ensures the working strength of each cutting tooth 31 in the tooth group 3, thereby ensuring the performance and operational stability of the stationary blade 1. Furthermore, because the height difference between the outer surface of the tooth group 3 and the outer surface of the substrate 11 (which can also be considered the recessed depth T5 of the tooth group 3 along the outer surface of the substrate 11) is less than the substrate thickness T4, the outer surface of the substrate 11 does not push against the skin when the outer surface of the tooth group 3 contacts the skin, thereby effectively improving the fit of the stationary blade 1 against the skin and enhancing the comfort of use.

[0070] The thinner the cutting teeth 31 in the tooth set 3, the greater the amount of grinding on the inner surface of each cutting tooth 31. Conversely, the thicker the cutting teeth 31 in the tooth set 3, the less grinding on the inner surface of each cutting tooth 31. Therefore, in actual production, the depth T5 of the recess of the tooth set 3 along the outer surface of the substrate 11 can also be determined based on the thickness T3 of the tooth set.

[0071] For example:

[0072] When the thickness T3 of the tooth group is required to be less than 0.10 mm, the amount of grinding required on the inner surface of each cutting tooth 31 in the tooth group 3 is relatively large. To ensure the working strength of each cutting tooth 31 in the tooth group 3, the recess depth T5 of the tooth group 3 along the outer surface of the substrate 11 can be appropriately reduced (the optimal recess depth is less than half the thickness of the substrate 11). When the inner surface of the tooth group 3 is ground, the step surface 12 is less ground. This allows the step surface 12 to support the root of each cutting tooth 31 in the tooth group 3, thereby ensuring the working strength of each cutting tooth 31 in the tooth group 3.

[0073] When the thickness T3 of the tooth group is required to be greater than 0.20 mm, the amount of grinding on the inner surface of each cutting tooth 31 in the tooth group 3 is relatively small. In this case, the depth of the recess of the tooth group 3 along the outer surface of the substrate 11 can be appropriately increased, such as to a depth greater than the thickness of the substrate 11 or greater than two-thirds or one-half of the thickness of the substrate 11, which can also ensure the working strength of each cutting tooth 31 in the tooth group 3. However, this also increases the height difference between the outer surface of the tooth group 3 and the outer surface of the substrate 11. When the outer surface of the tooth group 3 contacts the skin, the outer surface of the substrate 11 will exert a pushing force on the skin, which will affect the fit between the tooth group 3 and the skin, resulting in a relatively poor skin contact feeling. Therefore, the preferred embodiment is that the depth of the recess of the tooth group 3 along the substrate 11 is less than the thickness of the substrate 11.

[0074] To prevent the static blade 1 from causing a pushing sensation on the skin surface when in contact, thereby affecting the smoothness of shaving and the comfort of the skin, the stepped surface 12 on the outer surface of the base plate 11 connecting to the tooth group 3 is inclined, with an inclination angle K ≤ 75°. This inclination angle K is the angle between the stepped surface 12 and the extended line at the junction of the outer surface of the base plate 11 and the extended line, or the angle between the stepped surface 12 and the extended line at the junction of the outer surface of the tooth group 3 and the extended line. From the perspective of user comfort of the static blade 1, the flatter the inclination angle K of the stepped surface 12, the smoother the movement of the outer surface of the tooth group 3 and the outer surface of the base plate 11 along the skin surface during hair trimming. Therefore, the inclination angle K of the step surface 12 is preferably 15°±1°, which can relatively smoothly connect the outer surface of the blade group 3 and the outer surface of the base plate 11. When the outer surface of the blade group 3 contacts the skin and moves along the skin surface to shave hair, the outer surface of the base plate 11 will not produce a pushing sensation on the skin, thereby improving the skin comfort when the static blade 1 is used and ensuring the smoothness of hair trimming by the static blade 1. Of course, the inclination angle K of the step surface 12 can also be set to be larger or smaller, such as setting the inclination angle K to 50° or larger, so that the inclination slope of the step surface 12 is steeper. When the outer surface of the blade group 3 is in contact with the skin, the outer surface of the base plate 11 will produce a pushing force on the skin surface as it moves along the skin surface with the blade group 3. This will not only affect the smoothness of hair shaving, but also reduce skin comfort. If the inclination angle K of the step surface 12 is set to a smaller value, such as less than 5° or less, the distance between the root of each cutting tooth 31 in the tooth group 3 and the substrate 11 will be increased accordingly. When the inner surface of the tooth group 3 is ground, the inner surface of the step surface 12 will also be removed, which will seriously affect the working strength of each cutting tooth 31 in the tooth group 3 during use. Secondly, if the skin contact feeling is not considered, the step surface 12 can also be directly set to a vertical shape. However, since the vertical step surface 12 is difficult to demold during stamping, setting the inclination angle K of the step surface 12 to 15°±1° is the preferred embodiment.

[0075] Existing stationary blades 1 generally employ open-type cutting teeth 31, i.e., the tooth tips are independent entities, while the tooth roots are connected to the base plate 11. One side of the tooth group 3 is open, while the other three sides are connected to the base plate 11 via stepped surfaces 12. To ensure the working strength of the tooth group 3, the stepped surfaces 12 include a first stepped surface 121, a second stepped surface 122, and a third stepped surface 123. The first stepped surface 121 integrally connects the tooth roots of each cutting tooth 31 in the tooth group 3 to the base plate 11. The second stepped surface 122 and the third stepped surface 123 connect the two ends of the tooth group 3 to the base plate 11, respectively. The distance T6 between the second and third stepped surfaces 122, 123 and the edges of the base plate 11 at their respective connections is 3 mm to 5 mm. The distance T6 between the second and third differential surfaces 122, 123 and the edges of the substrate 11 at both ends is controlled to be between 3 mm and 5 mm. During use, the reserved 3 mm to 5 mm edge of the substrate 11 can effectively support the tooth group 3, preventing the cutting teeth 31 in the tooth group 3 from twisting and deforming during use, thereby improving the performance and operational stability of the static blade 1. If the 3 mm to 5 mm edge is not reserved at both ends of the substrate 11, and the ends of the tooth group 3 directly cover the ends of the substrate 11, the tooth group 3 can only be connected to the substrate 11 via the first differential surface 121. During use, the cutting teeth 31 in the tooth group 3 are easily twisted and deformed, seriously affecting the performance and operational stability of the static blade 1. Of course, the reserved distance between the edges of the substrate 11 at both ends can also be set to a larger distance, such as 8 mm, 10 mm, or even larger. However, increasing the reserved distance will correspondingly increase the material cost of the substrate 11 or shorten the length of the tooth group 3 to reduce the number of cutting teeth 31, thereby reducing the shaving efficiency. Therefore, the optimal embodiment is to reserve a distance of 3mm to 5mm at the edges of both ends of the substrate 11. While ensuring the working strength of each cutting tooth 31 of the tooth group 3, it can also minimize the material cost of the substrate 11. The second section differential surface 122 and the third section differential surface 123 have the same inclination angle, and the inclination angle of the second section differential surface 122 and the third section differential surface 123 is equal to, greater than, or less than the inclination angle K of the first section differential surface 121. To reduce the difficulty of manufacturing the stamping die, the inclination angles of the first section differential surface 121, the second section differential surface 122, and the third section differential surface 123 are preferably the same. Of course, it can also be customized according to user requirements, and the specific settings are not further limited in this embodiment.

[0076] To improve the contact between the stationary blade 1 and the skin, the outer surface of the base plate 11 has an arcuate cross-section, while the inner surface is horizontal and lower than the cutting surface 13 of the tooth assembly 3. This curved outer surface of the base plate 11 allows for better contact with the skin during use, enhancing the shaving effect and efficiency of the stationary blade 1. Of course, the outer surface of the base plate 11 can also be horizontal as needed to suit the overall style of different shaving tools or the aesthetic preferences of different users. The specific configuration can be determined based on actual needs or user requirements.

[0077] To enhance the skin feel of the stationary blade 1 during use, a side of the substrate 11 where the tooth group 3 is provided is provided with a bent edge having a height less than or equal to the thickness of the substrate 11, so that a tooth protrusion 14 is formed at the end of each cutting tooth 31 in the tooth group 3. By providing a bent edge on the edge of one side of the substrate 11 where the tooth group 3 is provided, a tooth protrusion 14 is formed at the end of each cutting tooth 31 during tooth cutting, with the tooth protrusion height T7 being less than or equal to the substrate thickness T4. Of course, the tooth protrusion 14 can also be formed without using a folding process. For example, the thickness of the substrate 11 can be increased (e.g., the thickness is greater than 0.5 mm). When the inner surface of the tooth group 3 is ground to cut the working surface 13, the tooth protrusion 14 structure can also be formed by controlling the distance between the grinding wheel and the edge of the substrate 11. However, since the tooth protrusions 14 are processed by a grinding process, the substrate thickness T4 is required to be thicker, and the amount of grinding will also be significantly increased, which not only increases the material cost of the substrate 11, but also reduces the processing efficiency of the cutting working surface 13 of the blade group 3. Therefore, the use of a folding process to form the tooth protrusions 14 is the preferred embodiment. The purpose of providing the tooth protrusions 14 structure at the end of the cutting teeth 31 is mainly to prevent the end of the cutting teeth 31 from puncturing the skin and improving the safety of the static blade 1. The tooth protrusions 14 are also used to stimulate the skin. In particular, when shaving the head, the tooth protrusions 14 at the end of each cutting tooth 31 can play a role similar to a comb, stimulating the nerves of the head, accelerating blood circulation and blood oxygen supply to the skin of the head, thereby creating a more comfortable skin feel and improving the comfort of the static blade 1.

[0078] 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 cutter head assembly with a limiting mechanism, comprising a stationary blade (1) provided with cutting teeth (31) and a movable blade (2); characterized in that The invention also includes a movable blade seat (5), a reinforcing pad (6) is provided between the movable blade seat (5) and the movable blade (2), so that the movable blade seat (5), the reinforcing pad (6) and the movable blade (2) are synchronously linked; a limiting mechanism (4) is provided on the inner surface of the stationary blade (1), the movable blade (2) is placed outside the limiting mechanism (4) and contacts the limiting mechanism (4), and under the action of an external force, the cutting teeth (31) of the movable blade (2) and the end surface of the cutting teeth (31) of the stationary blade (1) are abutted, and under the drive of the external force, the movable blade (2) can swing back and forth along the limiting mechanism (4).

2. The cutter head assembly with a limiting mechanism according to claim 1, characterized in that The limiting mechanism (4) is a flat limiting plate (41) fixed to the inner surface of the stationary blade (1); a limiting hole (21) is provided on the movable blade (2); the length of the limiting hole (21) is greater than the limiting plate (41), and the side walls of the limiting hole (21) are in contact with the side walls of the limiting plate (41), so that the movable blade (2) can swing back and forth along the limiting plate (41) under the driving of an external force.

3. The cutter head assembly with a limiting mechanism according to claim 2, characterized in that A limiting block (42) is provided on the side wall of the limiting piece (41), and the limiting block (42) enables the limiting piece (41) and the side wall of the limiting hole (21) to form line contact or point contact.

4. The cutter head assembly with a limiting mechanism according to claim 3, characterized in that At least two protruding arc blocks perpendicular to the swinging direction are respectively provided on the side walls of both sides of the limiting plate (41), and the arc midpoint of each arc block is tangent to the side walls on both sides of the limiting hole (21) to form a vertical line contact, and the arc blocks constitute the limiting blocks (42).

5. The cutter head assembly with a limiting mechanism according to claim 3, characterized in that At least one protruding triangular block with a triangular cross section is provided on both side walls of the limiting plate (41), one of the acute angled sides of the triangular block is parallel to and in line contact with the side walls of the limiting hole (21), and the triangular block constitutes the limiting block (42).

6. The cutter head assembly with a limiting mechanism according to claim 5, characterized in that The length of the triangular block is the same as that of the limiting piece (41).

7. The cutter head assembly with a limiting mechanism according to claim 5, characterized in that At least two spaced-apart triangular blocks are respectively provided on the side walls on both sides of the limiting plate (41), and each triangular block is respectively fixed to the two ends of the side wall of the limiting plate (41), and one of the acute angles of the triangular block is parallel to the side wall of the limiting hole (21) and forms a line contact.

8. The cutter head assembly with a limiting mechanism according to claim 3, characterized in that At least two cones are provided on the side walls on both sides of the limiting piece (41), and the apex of each cone forms point contact with the side wall corresponding to the limiting hole (21), and the cones constitute the limiting block (42).

9. The cutter head assembly with a limiting mechanism according to claim 2, characterized in that The thickness of the limiting piece T1 and the thickness of the movable blade T2 satisfy the following relationship: 0.5T2 ≤ T1 ≤ 2T 2 。 10. The cutter head assembly with a limiting mechanism according to claim 1, characterized in that The movable blade holder (5) is provided with a swing block (51), a swing groove (52) is provided on the lower end surface of the swing block (51), and the swing groove (52) is linked to the driving mechanism; support pieces (53) are respectively provided on both sides of the swing block (51), and at least one positioning column (54) is provided on the upper end surface of each support piece (53), and each positioning column (54) is respectively inserted into the positioning hole (23) of the movable blade (2) so that the movable blade (2) and the movable blade holder (5) are synchronously linked.

11. The cutter head assembly with a limiting mechanism according to claim 10, characterized in that A square hole (61) larger than or equal to the limiting hole (21) is provided on the reinforcing pad (6); the reinforcing pad (6) is fitted with the upper end surface of the movable blade (2) so that the square hole (61) and the limiting hole (21) coincide with each other; a cylindrical hole (62) having the same diameter as the limiting hole (21) is provided at a corresponding position of the reinforcing pad (6); a positioning column (54) provided on the supporting plate (53) passes through the cylindrical hole (62) and is inserted into the positioning hole (23) so that the movable blade seat (5), the reinforcing pad (6) and the movable blade (2) are synchronously linked.

12. The cutter head assembly with a limiting mechanism according to claim 11, characterized in that A connecting seat (63) having a width less than the length of the square hole (61) and spanning the square hole (61) is provided in the middle of the reinforcing pad (6). A concave groove (55) is provided on an end surface of the swing block (51) opposite to the end surface where the swing groove (52) is provided. The concave groove (55) covers the outside of the connecting seat (63) so that the reinforcing pad (6) and the movable knife seat (5) are synchronously linked and connected.

13. The cutter head assembly with a limiting mechanism according to claim 12, characterized in that The connecting seat (63) includes a side plate (631) connected to the two side walls of the square hole (61) of the reinforcing pad (6) and perpendicular to the reinforcing pad (6), and a bridge plate (632) connecting the side plates (631), arc-shaped positioning pieces (633) are symmetrically arranged on both sides of the bridge plate (632), and a plurality of through holes (634) of different shapes are provided on the bridge plate (632); arc-shaped cavities (551) are provided on both sides of the concave groove (55) in the swing block (51) of the movable knife seat (5), the positioning piece (633) is placed in the arc-shaped cavity (551), and a protruding linkage block (552) that matches the shape of the through hole (634) is provided at the bottom of the concave groove (55) and is placed in the corresponding through hole (634).

14. The cutter head assembly with a limiting mechanism according to claim 10, characterized in that At least two spring columns (56) are provided on the support plate (53) at the other end face where the positioning column (54) is provided. A pressure spring (7) is sleeved on each of the spring columns (56). The other end of the pressure spring (7) presses against the stationary blade seat (8) so that the movable blade seat (5) presses the reinforcing pad (6) and fits the cutting teeth (31) of the movable blade (2) with the end face of the cutting teeth (31) of the stationary blade (1). The two ends of the stationary blade seat (8) are respectively connected and fixed to the stationary blade (1) so that the movable blade seat (5), the reinforcing pad (6) and the movable blade (2) can be reciprocated and fixed between the stationary blade (1) and the stationary blade seat (8).

15. The cutter head assembly with a limiting mechanism according to claim 10, characterized in that Threaded seats (9) with threaded holes are respectively provided at both ends of the stationary blade (1), and each threaded seat (9) is fixedly connected to the inner surface of the stationary blade (1); the stationary blade seat (8) is closed on all sides and has a cavity inside, and screw holes (81) are respectively provided at both ends of the stationary blade seat (8) and are threadedly connected to the threaded seats (9) on the stationary blade (1) through screws (82) so that the movable blade seat (5) and the reinforcement pad (6) can be reciprocated and connected to the movable blade (2), and the swing groove (52) of the movable blade seat (5) is placed outside the stationary blade seat (8).

16. A stationary blade, used in a cutter head assembly with a limiting mechanism according to any one of claims 1 to 15, characterized in that The invention comprises a substrate (11), a plurality of cutting teeth (31) arranged side by side at at least one side edge of the substrate (11) to form a tooth group (3), the tooth group (3) being recessed downward along the outer surface of the substrate (11) so that the outer surface of each cutting tooth (31) in the tooth group (3) is lower than the outer surface of the substrate (11), and the inner surface protrudes from the inner surface of the substrate (11), and the edge of the tooth group (3) is connected to the substrate (11) via a step surface (12); a cutting working surface (13) is provided on the inner surface of the tooth group (3), and the thickness of each cutting tooth (31) in the tooth group (3) is less than the thickness T4 of the substrate.

17. The stationary blade according to claim 16, characterized in that The thickness T3 of the blade tooth group (3) is greater than or equal to 0.08 mm and less than the thickness T4 of the substrate.

18. The stationary blade according to claim 16, characterized in that The blade tooth group (3) is recessed downward along the outer surface of the substrate (11) to a depth T5 that is less than the thickness T4 of the substrate.

19. The stationary blade according to claim 16, characterized in that The step surface (12) of the outer surface of the substrate (11) connected to the blade tooth group (3) is inclined, and its inclination angle K is ≤75°.

20. The stationary blade according to claim 16, characterized in that The step differential surface (12) comprises a first step differential surface (121), a second step differential surface (122) and a third step differential surface (123); the first step differential surface (121) connects the tooth roots of each cutting tooth (31) in the tooth group (3) to the base plate (11) as a whole; the second step differential surface (122) and the third step differential surface (123) connect the two ends of the tooth group (3) to the base plate (11) respectively; and the connection points of the second step differential surface (122) and the third step differential surface (123) to the base plate (11) are respectively at a distance T6 of 3 mm to 5 mm from the edges of the two ends of the base plate (11).

21. The stationary blade according to claim 20, characterized in that The second section differential surface (122) and the third section differential surface (123) have the same inclination angle, and the inclination angle is equal to, greater than, or less than the inclination angle of the first section differential surface (121).

22. The stationary blade according to claim 16, characterized in that The outer surface cross section of the substrate (11) is arc-shaped, and the inner surface is a horizontal plane and is lower than the cutting working surface (13) of the blade tooth group (3).

23. The stationary blade according to claim 16, characterized in that The outer surface and inner surface of the substrate (11) are both horizontal surfaces, and the inner surface is lower than the cutting working surface (13) of the blade tooth group (3).

24. The stationary blade according to claim 16, characterized in that The side of the substrate (11) where the tooth group (3) is arranged is provided with a bent edge with a height less than or equal to the thickness of the substrate (11), so that the end of each cutting tooth (31) in the tooth group (3) forms a tooth protrusion (14).

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