Cutter head device and hair trimmer

Abstract

A cutter head device, comprising a plurality of technical solutions. Technical solution I is as follows: a cutter head device, which is a cutter head assembly (100) comprising a cutter holder (110) and a cutter head (120) mounted on the cutter holder in a floating manner in a first direction. The cutter head comprises a stationary blade (121), a movable blade (122) and a mounting bracket (130), wherein the stationary blade is mounted on the mounting bracket; the movable blade can reciprocate relative to the stationary blade in a preset direction to perform cutting; one of the mounting bracket and the cutter holder is provided with a guide rod (111) extending in the first direction, and the other one of the mounting bracket and the cutter holder is provided with a guide hole (124), which allows the guide rod to be inserted therein and is in sliding fit with the guide rod; the guide hole comprises a first guide section (125); the width of the cross section of the first guide section in the preset direction is greater than the width thereof in a second direction; and the preset direction, the first direction and the second direction intersect one another. Further disclosed is a hair trimmer comprising the cutter head device.

Description

Shaving head assembly and hair trimmer

[0001] This application claims priority to Chinese Patent Application No. 2024113406746, filed on September 24, 2024, entitled “Shaving head assembly and hair trimmer,” the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent Application No. 2024113408440, filed on September 24, 2024, entitled “Trimmer shaving head and electric trimmer,” the entire contents of which are incorporated herein by reference.

[0003] This application claims priority to Chinese Patent Application No. 2024223383549, filed on September 24, 2024, entitled “Moving blade assembly, shaving head module, and electric shaver,” the entire contents of which are incorporated herein by reference.

[0004] This application claims priority to Chinese Patent Application No. 2024223429557, filed on September 24, 2024, entitled “Shaving head assembly and hair trimmer,” the entire contents of which are incorporated herein by reference.

[0005] This application claims priority to Chinese Patent Application No. 2024223364340, filed on September 24, 2024, entitled “Moving blade of a hair trimmer, shaving head, and hair trimmer,” the entire contents of which are incorporated herein by reference.

[0006] This application claims priority to Chinese Patent Application No. 2024223333821, filed on September 24, 2024, entitled “Reciprocating shaving head of a hair trimmer and hair trimmer,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0007] The present application relates to the field of hair trimming, and in particular to a shaving head assembly and a hair trimmer. BACKGROUND

[0008] Common hair trimmers in life are razors, hair trimmers, etc. The cutter head assembly of the hair cutting device is installed on the main machine, and the moving cutter of the cutter head assembly is driven to reciprocate relative to the static cutter by the driving mechanism on the main machine to realize cutting hair. In order to make the cutter head assembly better fit the user's skin, the cutter head of the current cutter head assembly is set to be elastically floating up and down relative to the cutter holder, but it is easy to be stuck when floating, and whether it is reciprocating or floating up and down, it will make the noise too large, and the current connection relationship is not firm, the shearing efficiency is low, and the shearing area is small. SUMMARY

[0009] In view of the above problems, the first scheme of the present application proposes a cutter head device, aiming to solve the technical problem that the cutter head is easy to be stuck when floating.

[0010] In order to achieve the above purpose, the cutter head device proposed by the present application is a cutter head assembly, which includes a cutter holder and a cutter head floatingly installed on the cutter holder in a first direction; the cutter head includes a static cutter, a moving cutter and a mounting bracket, the static cutter is installed on the mounting bracket, and the moving cutter can reciprocate relative to the static cutter in a preset direction to realize cutting;

[0011] One of the mounting bracket and the cutter holder is provided with a guide rod extending in the first direction, and the other is provided with a guide hole for inserting and slidingly cooperating with the guide rod; the guide hole includes a first guide section, and the width of the cross section of the first guide section in the preset direction is greater than that in a second direction;

[0012] The preset direction, the first direction and the second direction intersect with each other.

[0013] The first scheme of the present application also proposes a hair trimmer, which is a hair cutting device, and the hair cutting device includes the cutter head assembly according to any one of the above embodiments.

[0014] In view of the above problems, the second scheme of the present application proposes a cutter head device, aiming to solve the technical problem that the cutter head assembly of the trimmer cutter head is noisy when floating.

[0015] In order to achieve the above purpose, the cutter head device proposed by the present application is a trimmer cutter head, which includes a cutter head assembly and a cutter head shell:

[0016] The tool head assembly comprises a tool seat and at least one tool head floatingly mounted on the tool seat in the up-down direction, the tool head comprising a mounting frame; one of the mounting frame and the tool seat is provided with a guide rod extending in the up-down direction, and the other is provided with a guide hole for slidingly fitting the guide rod; the guide hole has a guide section, the cross section of the guide section has a width in a first direction greater than a width in a second direction; the mounting frame has a limiting protrusion protruding in the first direction; the up-down direction, the first direction and the second direction are perpendicular to each other.

[0017] The tool head shell set comprises an outer shell and a buffer lining fixed to the inner wall of the outer shell, the buffer lining has a fitting part, the limiting protrusion can float up and down below the fitting part, and in the floating state of the tool head, the top surface of the limiting protrusion abuts against the fitting part.

[0018] The present application also provides a hair trimmer, which is an electric trimmer, the electric trimmer comprising a main machine and a trimmer tool head as described in any one of the above embodiments, the main machine comprising a machine shell and a driving shaft, the tool head shell set of the trimmer tool head being connected with the machine shell, and the driving shaft being connected with the tool head assembly of the trimmer tool head.

[0019] In view of the above problems, the third aspect of the present application provides a tool head device, aiming to solve the technical problem of unstable connection between the moving cutter and the moving cutter seat.

[0020] To achieve the above-mentioned purpose, the tool head device provided by the present application is a moving cutter assembly, which comprises a moving cutter and a moving cutter seat. The moving cutter comprises a body and a tooth portion, both of which extend in a first direction, and the tooth portion is connected to a side edge of the body extending in the first direction. The body is provided with a fixing hole penetrating through the body in the thickness direction of the body. The moving cutter seat comprises a seat body, a hot melting protrusion and a connecting portion. The hot melting protrusion is arranged on the side of the seat body facing the moving cutter, is inserted into the fixing hole, and is hot meltingly connected with the moving cutter at the fixing hole. The connecting portion is arranged on the side of the seat body away from the moving cutter, and is used for connecting with a driving device.

[0021] The present application also provides a tool head device, which is a tool head module, comprising a static cutter, a bracket and the above-mentioned moving cutter assembly. The static cutter is fixedly connected to the bracket. The moving cutter assembly is located on the side of the static cutter close to the bracket, and the moving cutter assembly is movably arranged in the bracket.

[0022] The present application also provides a hair trimmer, which is an electric shaver. The electric shaver comprises the above-mentioned tool head module.

[0023] In view of the above problems, the fourth aspect of the present application provides a cutter head device, aiming to solve the technical problem of low shearing efficiency caused by small shearing gap between short cutter head and long cutter head.

[0024] To achieve the above-mentioned purpose, the cutter head device provided by the present application is a cutter head assembly, which comprises:

[0025] a long cutter head, comprising a long strip-shaped fixed blade, a plurality of shearing teeth are arranged on both sides of the fixed blade in a first direction and are spaced apart in a second direction, and a shearing groove is formed between adjacent two shearing teeth;

[0026] two short cutter heads, which are respectively arranged on opposite sides of the long cutter head and are spaced apart from the long cutter head, the end of the shearing tooth and the long cutter head form a shearing gap extending in the second direction, and the shearing groove is communicated with the shearing gap, so that the to-be-cut object enters the shearing groove through the shearing gap;

[0027] The first direction is the width direction of the fixed blade, and the second direction is the length direction of the fixed blade.

[0028] The present application also provides a hair trimmer, which comprises the cutter head assembly and a driving device, and the output shaft of the driving device is connected to the cutter head assembly.

[0029] In view of the above problems, the fifth aspect of the present application provides a cutter head device, aiming to solve the technical problem of small effective shearing area of the moving cutter.

[0030] To achieve the above-mentioned purpose, the cutter head device provided by the present application is a moving cutter of a hair trimmer, which comprises an arc-shaped shearing part and two fixed walls.

[0031] The arc-shaped shearing part comprises a plurality of shearing edges arranged at intervals in a predetermined direction.

[0032] The two fixed walls are connected to both side ends of the arc-shaped shearing part in the bending direction and are located inside the outermost end of the arc-shaped shearing part, so that the outer side surface of each fixed wall and the outer side surface of the arc-shaped shearing part form a recessed space.

[0033] The present application also provides a cutter head device, which is a cutter head of a hair trimmer, and the cutter head of the hair trimmer comprises a fixed cutter, a moving cutter seat and the moving cutter of the hair trimmer as described in any one of the above embodiments, the fixed cutter covers the periphery of the arc-shaped shearing part of the moving cutter to cooperate with the arc-shaped shearing part to shear hair, and the two fixed walls of the moving cutter are fixedly connected to the moving cutter seat.

[0034] The application further provides a hair trimmer, comprising a main body and at least one hair trimmer head as described above, wherein the main body is provided with an output shaft connected with the moving cutter of the hair trimmer head to drive the moving cutter to reciprocate relative to the fixed cutter along the preset direction.

[0035] In view of the above problems, the sixth aspect of the application provides a hair trimmer head device, aiming to solve the technical problem that the shearing efficiency is not ideal due to the improper shearing stroke of the moving cutter.

[0036] To achieve the above-mentioned purposes, the hair trimmer head device provided by the application is a reciprocating hair trimmer head, which comprises a fixed cutter net and a moving cutter assembly.

[0037] The fixed cutter net covers the moving cutter assembly, and the moving cutter assembly reciprocates relative to the fixed cutter net along the preset direction within a shearing stroke.

[0038] The fixed cutter net is provided with a plurality of mesh holes distributed along the preset direction at intervals.

[0039] The shearing stroke is greater than or equal to the maximum distance of two adjacent mesh holes in the preset direction and less than or equal to the maximum distance of four adjacent mesh holes in the preset direction.

[0040] The application further provides a hair trimmer, comprising a driving assembly and a reciprocating hair trimmer head as described above, wherein the output shaft of the driving assembly is connected with the moving cutter assembly of the reciprocating hair trimmer head. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0042] FIG. 1 shows a structural schematic diagram of an embodiment of the hair trimmer head assembly of the application;

[0043] FIG. 2 is an exploded structural schematic diagram of the hair trimmer head and the cutter seat of the hair trimmer head assembly in FIG. 1;

[0044] FIG. 3 is a top view of the hair trimmer head assembly in FIG. 1;

[0045] FIG. 4 is a sectional view along the line IV-IV in FIG. 3;

[0046] FIG. 5 is a partial enlarged view of A in FIG. 4;

[0047] FIG. 6 is a partial sectional view of another embodiment of the hair trimmer head assembly of the application;

[0048] Figure 7 is a partial cross-sectional view of another embodiment of the cutting head assembly of the present application;

[0049] Figure 8 is a cross-sectional view of yet another embodiment of the cutting head assembly of the present application;

[0050] Figure 9 is a partial enlarged view of B in Figure 8;

[0051] Figure 10 is a schematic view of an embodiment of the end cap of the present application;

[0052] Figure 11 is a schematic view of the plastic part in Figure 10;

[0053] Figure 12 is a schematic view of another embodiment of the plastic part of the present application;

[0054] Figure 13 is a schematic view of an embodiment of the trimmer cutting head of the present application;

[0055] Figure 14 is a bottom view of the trimmer cutting head in Figure 13;

[0056] Figure 15 is a cross-sectional view of the trimmer cutting head in Figure 13 at an angle;

[0057] Figure 16 is a partial enlarged view of A in Figure 15;

[0058] Figure 17 is a cross-sectional view of the trimmer cutting head in Figure 13 at another angle;

[0059] Figure 18 is a partial enlarged view of B in Figure 17;

[0060] Figure 19 is an exploded schematic view of another embodiment of the trimmer cutting head of the present application;

[0061] Figure 20 is an assembly schematic view of the cutting head shell set in Figure 19;

[0062] Figure 21 is a bottom view of the cutting head shell set in Figure 20;

[0063] Figure 22 is an exploded schematic view of the cutting head shell set in Figure 20;

[0064] Figure 23 is a schematic view of an embodiment of the electric trimmer of the present application;

[0065] Figure 24 is an exploded schematic view of the electric trimmer in Figure 23;

[0066] Figure 25 is a schematic view of the electric trimmer in Figure 24 at another angle;

[0067] Figure 26 is a schematic view of an embodiment of the cutting head module of the present application;

[0068] Figure 27 is a schematic view of the cutting head module in Figure 26 at another angle;

[0069] Fig. 28 is an exploded view of the cutting head module of Fig. 26;

[0070] Fig. 29 is a structural schematic view of the moving cutter assembly of Fig. 27;

[0071] Fig. 30 is an exploded view of the moving cutter assembly of Fig. 29;

[0072] Fig. 31 is a structural schematic view of the moving cutter assembly of Fig. 30 from another perspective;

[0073] Fig. 32 is a top view of the cutting head module of Fig. 26;

[0074] Fig. 33 is a sectional view of Fig. 32 along VIII-VIII;

[0075] Fig. 34 is a structural schematic view of an embodiment of the cutting head assembly of the present application;

[0076] Fig. 35 is an exploded view of an embodiment of the cutting head assembly of the present application;

[0077] Fig. 36 is a sectional view of Fig. 34 at P-P;

[0078] Fig. 37 is an enlarged view of Fig. 36 at A;

[0079] Fig. 38 is a schematic view of the fixed cutter of the cutting head assembly of the present application;

[0080] Fig. 39 is a schematic view of the fixed cutter of the cutting head assembly of the present application from another perspective;

[0081] Fig. 40 is a structural schematic view of an embodiment of the moving cutter of the hair clipper of the present application;

[0082] Fig. 41 is a left view of the moving cutter of the hair clipper of Fig. 40;

[0083] Fig. 42 is a sectional view of the moving cutter of the hair clipper of Fig. 40 from one perspective;

[0084] Fig. 43 is a sectional view of an embodiment of the cutting head of the hair clipper of the present application, wherein the dashed portion indicates a prior art moving cutter having a U-shaped cross-section;

[0085] Fig. 44 is a structural schematic view of the cutting head of the hair clipper of Fig. 43, wherein the fixed cutter is removed;

[0086] Fig. 45 is an exploded view of the cutting head of the hair clipper of Fig. 44;

[0087] Fig. 46 is a structural schematic view of an embodiment of the hair clipper of the present application;

[0088] Fig. 47 is a structural schematic view of the cutting head of the hair clipper of Fig. 46;

[0089] Fig. 48 is a sectional view of the cutting head of the hair clipper of Fig. 47 from one perspective;

[0090] FIG. 49 shows a structure diagram of a reciprocating cutter head of the hair trimmer of the present application;

[0091] FIG. 50 is an exploded view of the reciprocating cutter head of the hair trimmer of FIG. 49;

[0092] FIG. 51 is a partial exploded view of the reciprocating cutter head of the hair trimmer of FIG. 50;

[0093] FIG. 52 is a structure diagram of the static cutter net of FIG. 51;

[0094] FIG. 53 is a partial enlarged view of P of FIG. 52;

[0095] FIG. 54 is a structure diagram of the moving cutter of FIG. 51;

[0096] FIG. 55 is a sectional view of the reciprocating cutter head of the hair trimmer of FIG. 49;

[0097] FIG. 56 is a structure diagram of the hair trimmer of the present application. DETAILED DESCRIPTION

[0098] It should be noted that if the present application has a directionality indication (such as up, down, left, right, front, back, etc.) in the embodiments, the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0099] In addition, if the present application has a description of "first", "second", etc. in the embodiments, the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B are satisfied at the same time.

[0100] The present application provides six independent schemes, and the following points need to be noted: first, the component names in the six schemes are independent of each other, and are not mutually referenced. For example, the component names in the first scheme are only applicable to the first scheme and are not applicable to the second to sixth schemes. Even if the same name as in the first scheme exists in the second to sixth schemes, the components referred to are different, which has no relation to the first scheme. Or, the same component as in the first scheme exists in the second to sixth schemes, but the name is different, which also has no relation to the first scheme. As for the second to sixth schemes being the same as the first scheme, the same understanding can be made, and no further explanation is given. Next, examples will be given to illustrate:

[0101] (1) The frame in the first scheme and the frame body in the second scheme both represent the same component, but the names are different in different schemes. Please understand the names in each scheme.(2) The middle cutter in the second scheme and the long whisk cutter in the fourth scheme both represent the same component, but the names are different in different schemes. Please understand the names in each scheme.(3) The side cutter in the second scheme and the short whisk cutter in the fourth scheme both represent the same component, but the names are different in different schemes. Please understand the names in each scheme. There are still some of the above-mentioned components in the six schemes that represent the same component but have different component names. The same understanding and processing can be referred to the above-mentioned way, and this embodiment will not give examples one by one.

[0102] (4) The same name fixing hole exists in the second and third schemes, but the fixing hole in the second scheme and the fixing hole in the fourth scheme refer to different components, i.e. the same name but different components. Please understand the names in each scheme.(5) The same name connecting part exists in the third, fifth and sixth schemes, but the connecting part in the fifth and sixth schemes refers to the same component, and the connecting part in the third scheme refers to a different component, i.e. the same name but different components. Please understand the names in each scheme. There are still some of the above-mentioned components in the six schemes that have the same name but represent different components. The same understanding and processing can be referred to the above-mentioned way, and this embodiment will not give examples one by one.

[0103] Secondly, the reference signs of the component names in each of the six embodiments of the present application are independent of each other and are not referred to each other. For example, the reference signs of the component names in the first embodiment are only applicable to the first embodiment and are not applicable to the second to sixth embodiments. Even if the same reference signs are present in the second to sixth embodiments as in the first embodiment, the components referred to are different, which has no relation to the first embodiment. Or, even if the same components are present in the second to sixth embodiments as in the first embodiment, but the reference signs are different, which also has no relation to the first embodiment. As for the second to sixth embodiments being the same as the first embodiment, the same understanding can be made, and thus will not be described in detail. Next, examples will be given to illustrate:

[0104] (1) The moving cutter is present in the first to third embodiments and the fifth to sixth embodiments, but the reference signs of the moving cutter are different in different embodiments. For example, the reference sign of the moving cutter in the first embodiment is 122, the reference sign of the moving cutter in the second embodiment is 126, the reference sign of the moving cutter in the third embodiment is 10, the reference sign of the moving cutter (the moving cutter of the hair clipper) in the fifth embodiment is 100, and the reference sign of the moving cutter in the sixth embodiment is 128. Therefore, the same component has different reference signs in different embodiments, and the reference signs in each embodiment should be understood respectively. (2) The moving cutter seat is present in the third, fifth and sixth embodiments, but the reference signs of the moving cutter are different in different embodiments. For example, the reference sign of the moving cutter seat in the third embodiment is 20, the reference sign of the moving cutter seat in the fifth embodiment is 300, and the reference sign of the moving cutter seat in the sixth embodiment is 123. Therefore, the same component has different reference signs in different embodiments, and the reference signs in each embodiment should be understood respectively. In the six embodiments, there are still some of the above-mentioned cases in which the same component is represented by different reference signs, which can be understood and processed in the same way as described above. The present embodiment will not be described one by one.

[0105] (3) The same reference number 100 is used in all six embodiments, but represents different components in different embodiments. For example, in the first, second and fourth embodiments, the reference number 100 represents the cutter head assembly, in the third embodiment, the reference number 100 represents the moving cutter assembly, in the fifth embodiment, the reference number 100 represents the moving cutter of the hair trimmer, and in the sixth embodiment, the reference number 100 represents the reciprocating cutter head of the hair trimmer. Therefore, the same reference number represents different components in different embodiments, and the respective reference numbers should be understood in each embodiment.

[0106] Thirdly, regarding the drawings, there are 56 drawings in total in the six embodiments, but each embodiment has its respective corresponding drawings, and the other drawings are irrelevant to the embodiment. For example, the first embodiment only corresponds to Figures 1-12, and the other drawings are irrelevant to the first embodiment. The second embodiment only corresponds to Figures 13-25, and the other drawings are irrelevant to the second embodiment. The third embodiment only corresponds to Figures 26-33, and the other drawings are irrelevant to the third embodiment. The fourth embodiment only corresponds to Figures 34-39, and the other drawings are irrelevant to the fourth embodiment. The fifth embodiment only corresponds to Figures 40-48, and the other drawings are irrelevant to the fifth embodiment. The sixth embodiment only corresponds to Figures 49-56, and the other drawings are irrelevant to the sixth embodiment.

[0107] Common hair cutting devices in life are razors, hair trimmers, etc. The cutter head assembly of the hair cutting device is installed on the main machine, and the moving cutter of the cutter head assembly is driven to move relative to the static cutter by the driving mechanism on the main machine to achieve cutting hair. In order to make the cutter head assembly better fit the user's skin, the cutter head of the current cutter head assembly is set to be elastically floating up and down relative to the cutter holder.

[0108] In the related art, a cylindrical guide hole is arranged on the end cover of the cutter head, so that the guide rod on the cutter holder is assembled in the cylindrical guide hole in an up-down sliding manner. When a user uses the hair cutting device, one end of the cutter head may be subjected to a relatively large force, and the cutter head may be deflected. In order to ensure that the cutter head has a certain deflection angle when floating up and down, the gap between the guide rod and the guide hole is usually large. However, the large gap causes the cutter head to shake in a direction perpendicular to the reciprocating direction, and the cutter head shaking may interfere with the cutter head shell or other cutter heads, which may easily be stuck or emit scraping noise, affecting the user experience.

[0109] The above content is only used to assist in understanding the technical solutions of the application and does not mean that the above content is prior art.

[0110] In order to solve the above problems, please refer to FIGS. 1 to 12, the first scheme of the present application proposes a cutter head device applied to a hair trimmer.

[0111] In the embodiments of the present application, please refer to FIGS. 1 to 7, the cutter head device is a cutter head assembly 100, which includes a cutter holder 110 and a cutter head 120 floatingly installed on the cutter holder 110 in a first direction; the cutter holder 110 includes a static cutter 121, a dynamic cutter 122, and a mounting bracket 130, the static cutter 121 is installed on the mounting bracket 130, and the dynamic cutter 122 can reciprocate relative to the static cutter 121 in a preset direction to achieve cutting; one of the mounting bracket 130 and the cutter holder 110 is provided with a guide rod 111 extending in the first direction, and the other is provided with a guide hole 124 for inserting and slidingly cooperating with the guide rod 111; the guide hole 124 includes a first guide section 125, the cross section of the first guide section 125 has a width in a preset direction greater than a width in a second direction; the preset direction, the first direction, and the second direction intersect with each other.

[0112] In the embodiments, the cutter holder 110 provides installation and connection for the cutter head 120, and the structure and shape of the cutter holder 110 can be various, which can be designed according to the type and number of the cutter head 120, and is not specifically limited here. The cutter head 120 and the cutter holder 110 are inserted into the guide hole 124 through the guide rod 111 and are slidingly cooperated with each other, so that the cutter head 120 can float in the first direction relative to the cutter holder 110 along the guide rod 111. Generally, a spring is sleeved on the guide rod 111, one end of the spring abuts against the cutter holder 110, and the other end abuts against the cutter head 120, so that the cutter head 120 elastically floats in the first direction, so that the static cutter 121 better fits the skin of the user.

[0113] The dynamic cutter 122 is fixedly connected to a dynamic cutter holder for connecting with a driving shaft of a motor, and the dynamic cutter holder is movably arranged in the mounting bracket 130, so that the dynamic cutter 122 is attached to the inner side of the static cutter 121 and reciprocates relative to the static cutter 121 in the preset direction.

[0114] The type of the cutter head 120 can be various, for example, the cutter head 120 can be a long whisker cutter head 120 or a short whisker cutter head 120, as long as the moving cutter 122 can reciprocate relative to the static cutter 121 along the preset direction to realize cutting. Among them, the short whisker cutter head 120 refers to the structure that the static cutter 121 is a curved cutter net with multiple holes, and the long whisker cutter head 120 refers to the structure that the static cutter 121 is a flat cutter with multiple shearing teeth on both sides. The mounting bracket 130 is used to provide installation and support for the static cutter 121. The specific structure of the mounting bracket 130 can be selected and designed according to the type of the cutter head 120, which is not limited here.

[0115] The preset direction, the first direction and the second direction intersect with each other, specifically, the preset direction, the first direction and the second direction can be perpendicular to each other. For the convenience of description, the orientation of the cutter head assembly 100 when in use is taken as a reference, the preset direction is defined as the left-right direction, the first direction is defined as the up-down direction, and the second direction is defined as the front-back direction.

[0116] It can be understood that the cross section of the first guide section 125 of the guide hole 124 refers to the section perpendicular to the axis of the guide hole 124. The width of the cross section of the first guide section of the guide hole 124 in the preset direction is greater than that in the second direction, specifically, referring to FIGS. 5-12, the cross section of the guide hole 124 is in the shape of a racetrack or an ellipse. In this way, the inner peripheral wall of the guide hole 124 is a smooth transition plane or a circular arc surface, which can improve the smoothness of the sliding of the guide rod 111 in the guide hole 124 and reduce the sliding noise of the guide rod 111 in the guide hole 124. In other embodiments, the cross section of the guide hole 124 can also be in other shapes.

[0117] It should be noted that the cutter head 120 reciprocating along the preset direction is usually connected with the driving shaft of the motor, and the motor drives the moving cutter 122 to reciprocate along the left-right direction. When the user uses the cutter head assembly 100, if the two ends of the cutter head 120 are not uniformly stressed, the whole cutter head 120 will inevitably swing slightly left and right, that is, the left and right ends of the cutter head 120 will rotate around the driving shaft of the motor.

[0118] The application realizes the up-down floating connection of the tool head 120 and the tool holder 110 by the sliding fit of the guide rod 111 and the guide hole 124, the width of the cross section of the first guide section 125 of the guide hole 124 in the preset direction is greater than that in the second direction, that is, the size of the first guide section 125 in the moving direction of the moving tool 122 is greater than that in other directions, so that space is provided for the slight deflection of the two ends of the tool head 120, and interference caused by the slight rotation of the tool head 120 left and right when the tool head 120 floats up and down along the guide rod 111 is avoided. In addition, the width of the first guide section 125 in the second direction is less than that in the preset direction, which can reduce the gap between the guide hole 124 and the guide rod 111 in the second direction, avoid the large deflection of the tool head 120 in the second direction (front-back direction), and avoid the interference between the tool head 120 and the tool head shell or other tool heads 120 to cause jamming or scraping noise, thereby improving the user experience.

[0119] In an embodiment, as shown in FIGS. 4-7 and 11, the mounting frame 130 is provided with a guide hole 124, and the tool holder 110 is provided with a guide rod 111 extending in the first direction. The width of the cross section of the first guide section 125 in the preset direction gradually increases in the direction away from the tool holder 110.

[0120] In this embodiment, it can be understood that since the tool head 120 is deflected up and down as a whole with the driving shaft of the motor as the center, the required rotation space of the guide rod 111 gradually increases away from the tool holder 110. By gradually increasing the width of the cross section of the first guide section 125 in the preset direction in the direction away from the tool holder 110, when the tool head 120 is slightly rotated to the limit position, the wall surface of the first guide section 125 in the preset direction can be adapted to fit the guide rod 111, and the gap between the end of the first guide section 125 close to the tool holder 110 and the guide rod 111 is small. Compared with the way of setting the cross-sectional size of the entire first guide section 125 in the first direction to be larger and consistent, the collision noise can be reduced, the guide fit of the guide rod 111 and the guide hole 124 can be effectively ensured, and the guiding accuracy can be improved. In order to further improve the fitting degree of the guide hole 124 when the guide rod 111 is deflected, preferably, the cross-sectional size of the first guide section 125 gradually increases in the direction away from the tool holder 110.

[0121] Further, the guide hole 124 also has a second guide section 126 connected to the end of the first guide section 125 close to the tool holder 110, and the cross-sectional size of the second guide section 126 is consistent in the first direction.

[0122] In the embodiment, by arranging the second guiding section 126 close to one end of the tool holder 110, and the cross-sectional dimension of the second guiding section 126 is consistent in the first direction, the second guiding section 126 can guide the guide rod 111, increase the guiding cooperation area between the whole guiding hole 124 and the guide rod 111, and further improve the guiding precision of the guide rod 111 to the tool head 120.

[0123] In an embodiment, referring to FIG. 4, FIG. 5 and FIG. 7, in the first direction, the extension length of the second guiding section 126 is less than the extension length of the first guiding section 125. If the length of the second guiding section 126 is greater than the length of the first guiding section 125, on the one hand, the length of the whole guiding hole 124 is too long, which increases the volume of the tool head 120, and on the other hand, the guiding cooperation area between the guide rod 111 and the guiding hole 124 is too large, which easily affects the deflection effect. By making the extension length of the second guiding section 126 less than the extension length of the first guiding section 125, the size of the tool head 120 can be designed to be smaller while ensuring the deflection effect.

[0124] Further, in the first direction, the ratio of the extension length of the first guiding section 125 to the extension length of the second guiding section 126 is greater than or equal to 2.

[0125] In the embodiment, specifically, the ratio of the extension length of the first guiding section 125 to the extension length of the second guiding section 126 can be 2, 2.5, 3, 3.4, 4, 4.5, 5, 5.6, 6. When the ratio of the extension length of the first guiding section 125 to the extension length of the second guiding section 126 is less than 2, the length of the second guiding section 126 is too long, on the one hand, the length of the whole guiding hole 124 is too long, which increases the volume of the tool head 120 or the tool holder 110, and on the other hand, the guiding cooperation area between the guide rod 111 and the guiding hole 124 is too large. By making the ratio of the extension length of the first guiding section 125 to the extension length of the second guiding section 126 greater than or equal to 2, the size of the tool head 120 or the tool holder 110 can be designed to be smaller while ensuring the deflection effect.

[0126] In an embodiment, as shown in FIG. 5 to FIG. 9, the gap between the hole wall of the second guiding section 126 and the outer wall of the guide rod 111 is greater than or equal to 0.01mm and less than or equal to 0.05mm.

[0127] In the embodiment, the gap between the hole wall of the second guiding section 126 and the outer wall of the guide rod 111 can be 0.01, 0.02, 0.03, 0.05, etc. When the gap between the hole wall of the second guiding section 126 and the outer wall of the guide rod 111 is less than 0.01, the gap between the guiding hole 124 and the guide rod 111 is too small, which makes the guide rod 111 easily interfere with the guiding hole 124, and is not conducive to the up-and-down floating of the cutter head 120. When the gap between the hole wall of the second guiding section 126 and the outer wall of the guide rod 111 is greater than 0.05, the gap between the guiding hole 124 and the guide rod 111 is too large, which makes the cutter head 120 shake in the preset direction and the second direction with an excessively large amplitude, affecting the user experience. By making the gap between the hole wall of the second guiding section 126 and the outer wall of the guide rod 111 greater than or equal to 0.01 and less than or equal to 0.05, the interference between the cutter head 120 and the guide rod 111 is effectively solved, and at the same time, the shaking amplitude of the entire cutter head 120 in the preset direction is reasonable, which does not affect the user experience.

[0128] In an embodiment, as shown in FIGS. 2-7, the mounting frame 130 includes a frame 131 and two end covers 123 mounted on both ends of the frame 131 in the preset direction, and the static cutter 121 is mounted on the frame 131; the end cover 123 is provided with the guiding hole 124, and the cutter seat 110 is provided with the guide rod 111.

[0129] In the embodiment, it can be understood that, since the depth of the guiding hole 124 in the scheme is relatively large, if the guiding hole 124 is arranged on the cutter seat 110, the thickness of the cutter seat 110 needs to be increased, which increases the weight of the entire hair cutting device. Arranging the guiding hole 124 on the end cover 123 makes full use of the size of the end cover 123 in the first direction, without the need to increase the volume of the end cover 123, so that the overall structure is more compact. The guide rod 111 and the cutter seat 110 can be fixedly connected by screwing, welding, embedding, etc. The guide rod 111 is used to provide guidance and support for the end cover 123, and the number of guide rods 111 can correspond to the number of end covers 123. The frame 131 is specifically a static cutter support, and the frame 131 and the static cutter 121 can be fixedly connected by welding, etc. The structure and form of the end cover 123 can also be various, for example, the end cover 123 can be a single-layer structure, or a double-layer structure with an outer metal layer and an inner plastic layer. The material of the end cover 123 can be selected and designed according to actual needs, which is not specifically limited here.

[0130] Further, referring to FIGS. 4-10, the end cover 123 includes a metal outer cover 128 and a plastic piece 129 connected in the metal outer cover 128; the metal outer cover 128 is fixedly connected with the frame 131, and the plastic piece 129 is provided with the guide hole 124. The metal outer cover 128 and the plastic inner liner can be fixedly connected by clamping, bonding, secondary injection molding, etc. The metal outer cover 128 and the frame 131 can be fixedly connected by welding, etc. By arranging the metal outer cover 128, the structural strength of the end cover 123 can be improved, and the appearance of the cutter head 120 has a metallic texture. The plastic piece 129 is arranged in the metal outer cover 128, which has a lower cost and a lighter weight compared with metal. In addition, the guide hole 124 is arranged on the plastic piece 129, so that the guide rod 111 cooperates with the guide hole 124 on the plastic piece 129, which can further reduce the guide noise of the guide rod 111 and the end cover 123 compared with the cooperation of the guide rod 111 and the guide hole 124 of the metal end cover 123.

[0131] Further, as shown in FIGS. 4-7, 11 and 12, the plastic piece 129 is further provided with a clearance cavity 127 communicating with the guide hole 124, the clearance cavity 127 is arranged on the side of the guide hole 124 away from the cutter seat 110, and the cross-sectional size of the clearance cavity 127 is greater than the cross-sectional size of the first guide section 125.

[0132] In the embodiment, it can be understood that the cross section of the clearance cavity 127 refers to the cross section perpendicular to the axis of the guide hole 124. The cross-sectional size of the clearance cavity 127 is greater than the cross-sectional size of the first guide section 125, that is, the hole wall of the guide hole 124 is located within the cavity wall of the clearance cavity 127. By arranging the clearance cavity 127, when the cutter head 120 swings slightly too much and the guide rod 111 extends out of the guide hole 124, the guide rod 111 can be provided with a clearance space, further avoiding the interference between the guide rod 111 and the end cover 123.

[0133] In an embodiment, as shown in FIGS. 1-9, the cutter head 120 is provided with a plurality of cutter heads 120, and the plurality of cutter heads 120 are arranged side by side along the second direction. The cutter head 120 can be specifically provided with two, three, four, etc. The types of the plurality of cutter heads 120 can be the same or different. Optionally, the cutter head 120 is provided with three, of which two side cutter heads 120 are short whisk cutter heads 120, and the middle cutter head 120 is a long whisk cutter head 120. The mounting frame 130 of the plurality of cutter heads 120 can be provided with the guide hole 124 or the guide rod 111, or the mounting frame 130 of part of the cutter heads 120 can be provided with the guide hole 124, and the mounting frame 130 of another part of the cutter heads 120 can be provided with the guide rod 111, which can be selected and designed according to actual needs, and is not specifically limited here.

[0134] By making the plurality of cutter heads 120 and the cutter seat 110 each realize up and down floating through the guide rod 111 and the guide hole 124, and making the cross section of the first guide section 125 of the plurality of guide holes 124 each be set as the width in the preset direction being greater than the size in the second direction, effectively avoiding the plurality of cutter heads 120 from greatly shaking in the second direction, interference between the cutter head 120 and the cutter head shell or adjacent cutter head 120 can be avoided to cause jamming or scraping noise, so as to improve the user experience.

[0135] The application also provides a hair trimmer, which is a hair cutting device. The hair cutting device comprises the cutter head assembly 100. The specific structure of the cutter head assembly 100 is referred to the above embodiments. Since the hair cutting device adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments. Here, the beneficial effects will not be repeated. The hair cutting device can be a shaver. The hair cutting device further comprises a motor. The driving shaft of the motor is connected with the moving cutter 122 to drive the moving cutter 122 to reciprocate in the preset direction. Specifically, the motor can be a linear motor. The number of the linear motor can be selected and designed according to the number of the cutter heads 120. For example, the linear motor can be one or two. The structure of the linear motor can refer to the existing design, which will not be repeated here.

[0136] Common electric trimmers include electric shavers, hair trimmers and the like. In order to make the electric trimmer better fit the contour of the user's body surface during use, the cutter head of the current trimmer is designed to be floating up and down relative to the cutter head shell. In order to improve the texture, feel and facilitate cleaning, more and more electric trimmers tend to use metal cutter head shells.

[0137] In the related prior art, the frame body of the cutter head assembly is provided with a plurality of limiting lugs on the front and left and right sides, so as to limit the floating range of the cutter head assembly. In this way, when the cutter head assembly floats in the inner cavity of the cutter head shell, it is easy to collide and scratch the inner wall of the cutter head shell, generating a harsh noise.

[0138] The above content is only used to assist in understanding the technical solutions of the application, and does not mean that the above content is prior art.

[0139] In order to solve the above problems, please refer to FIGS. 13 to 25. The second scheme of the application provides a cutter head device.

[0140] In the embodiments of the present application, please refer to FIG. 13 to FIG. 19, the cutter head device is a trimmer cutter head 120, the trimmer cutter head 120 comprises a cutter head assembly 100 and a cutter head shell set 200: the cutter head assembly 100 comprises a cutter seat 110 and at least one cutter head 120 which is floatingly installed on the cutter seat 110 in the up-down direction, the cutter head 120 comprises a mounting bracket 121; one of the mounting bracket 121 and the cutter seat 110 is provided with a guide rod 111 extending in the up-down direction, and the other is provided with a guide hole 122 for slidingly fitting the guide rod 111; the guide hole 122 has a guide section 123, the cross section of the guide section 123 has a width in a first direction which is greater than a width in a second direction; the mounting bracket 121 has a limiting protrusion 124 which protrudes in the first direction; the up-down direction, the first direction and the second direction are perpendicular to each other.

[0141] The cutter head shell set 200 comprises an outer shell 210 and a buffer lining 220 fixed to the inner wall of the outer shell 210, the buffer lining 220 has a fitting part 221, the limiting protrusion 124 can float up and down below the fitting part 221, and in the floating state, the top surface of the limiting protrusion 124 abuts against the fitting part 221.

[0142] In the embodiments, the cutter seat 110 is used to provide installation and connection for the cutter head 120, the structure and shape of the cutter seat 110 can be various, which can be designed according to the type and number of the cutter head 120, and is not specifically limited here. The number of the cutter head 120 can be selected according to actual needs, for example, it can be one, two, three, etc., and the number of the cutter head 120 is not specifically limited here. The cutter head 120 can be a long hair cutter head 120 or a short hair cutter head 120. The mounting bracket 121 is used to install the structures such as the static cutter 125 of the cutter head 120. The specific structure of the mounting bracket 121 can be various, which is not specifically limited here. The entire cutter head 120 can float up and down along the guide rod 111, and generally, a spring is sleeved on the guide rod 111, so that one end of the spring abuts against the cutter seat 110 and the other end abuts against the mounting bracket 121, so that the cutter head 120 can be elastically floated up and down, so that the static cutter 125 can better fit the skin of the user.

[0143] It can be understood that the cross section of the guide section 123 refers to the section perpendicular to the axis of the guide hole 122. The cross section of the guide section 123 of the guide hole 122 has a width in a first direction which is greater than a width in a second direction, and the cross section shape of the guide hole 122 can be a racetrack shape or an elliptical shape. In this way, the inner peripheral wall of the guide hole 122 is a smooth transition plane or a circular arc surface, which can improve the sliding smoothness of the guide rod 111 in the guide hole 122 and reduce the sliding noise of the guide rod 111 in the guide hole 122. In other embodiments, the cross section of the guide hole 122 can also be designed in other shapes.

[0144] Since the matching gap of the guide rod 111 and the guide hole 122 in the second direction is reduced, the entire cutter head 120 can be prevented from shaking greatly in the second direction, and therefore, the limiting protrusions 124 only need to be arranged at both ends of the cutter head 120 in the first direction, and the limiting protrusions 124 do not need to be arranged at both sides of the cutter head 120 in the second direction, thereby reducing the number of the limiting protrusions 124 on the cutter head 120 and further reducing the collision noise.

[0145] The limiting protrusion 124 can be a lug arranged on the peripheral side wall of the mounting frame 121 in the first direction, and of course, the limiting protrusion 124 can also be a column or the like. The limiting protrusion 124 can limit the displacement amount of the upward movement of the cutter head 120, and the cutter seat 110 can limit the displacement amount of the downward movement of the cutter head 120. Specifically, the lower surface of the limiting protrusion 124 protrudes from the bottom wall of the mounting frame 121. In this way, the downward displacement amount of the cutter head 120 is limited by the cooperation of the limiting protrusion 124 and the cutter seat 110, and the cutter head 120 and the cutter seat 110 can be prevented from colliding in a large area, so as to reduce the noise and wear.

[0146] The shell 210 is wrapped around the outer periphery of the cutter head assembly 100, so as to form the appearance surface of the entire trimmer cutter head 120. The shell 210 can be made of a metal material, which can improve the product quality and feel, improve the structural strength and service life of the shell 210, and facilitate product cleaning. The buffer lining 220 can be made of a plastic, rubber, silicone or other buffer material with lower rigidity than the shell 210. Specifically, the shell 210 is made of a metal material, and the buffer lining 220 is made of an elastic material. The buffer lining 220 made of an elastic material can better absorb shock and buffer, thereby effectively silencing and reducing noise of the limiting protrusion 124. The buffer lining 220 and the shell 210 can be fixedly connected in a way of embedding, screw connection, injection molding connection or the like. The shape of the buffer lining 220 can be various, which is not limited here. By making the limiting protrusion 124 cooperate with the matching portion 221 on the buffer lining 220 instead of directly contacting the shell 210, the collision and harsh noise of the limiting lug can be effectively avoided.

[0147] The pruner head 120 is mounted on the seat 110 in a floating manner, and the head 120 has a limiting protrusion 124 protruding in the first direction. A buffer lining 220 is arranged in the housing 210, and the limiting protrusion 124 is limitedly matched with a matching part 221 of the buffer lining 220. The floating range of the head 120 relative to the seat 110 is effectively and reliably limited. Compared with the case that the limiting protrusion 124 directly contacts the housing 210, the buffer lining 220 can mute the limiting protrusion 124 to avoid collision noise caused by the floating of the limiting protrusion 124. When the pruner head 120 has multiple heads 120, compared with the way of arranging a buffer sleeve on the limiting protrusion 124 to reduce noise, the application does not need to finely assemble multiple buffer sleeves with multiple limiting protrusions 124. Multiple limiting protrusions 124 can be in contact with the buffer lining 220 at the same time, thereby reducing manufacturing costs and simplifying the installation steps.

[0148] In addition, the head 120 and the seat 110 are slidably matched by the guide rod 111 and the guide hole 122. The cross section of the guide section 123 of the guide hole 122 has a width in the first direction greater than a width in the second direction. In this way, the matching gap between the guide rod 111 and the guide hole 122 in the second direction is reduced, and the entire head 120 can be prevented from shaking greatly in the second direction. Therefore, only the limiting protrusions 124 need to be arranged at both ends of the head 120 in the first direction, and the limiting protrusions 124 do not need to be arranged at both sides of the head 120 in the second direction. Thus, the number of limiting protrusions 124 on the head 120 is reduced, the structure of the head 120 is simplified, and the noise source is reduced. Therefore, only the buffer lining 220 needs to be arranged on the inner wall of the limiting protrusion 124 on the mounting frame 121 of the housing 210, the volume of the buffer lining 220 can be reduced, and the manufacturing cost is reduced.

[0149] Further, the mounting frame 121 includes a frame body and two end covers mounted on both ends of the frame body in the first direction, and each end cover protrudes with the limiting protrusion. The head 120 further includes a static knife 125 and a dynamic knife 126. The static knife 125 is fixedly connected to the frame body, and the dynamic knife 126 is arranged on the inner side of the static knife 125 and can reciprocate relative to the static knife 125 along the first direction to realize cutting. The buffer lining 220 is arranged in two, and the two buffer linings 220 are respectively fixed on the inner walls of both ends of the housing 210 in the first direction.

[0150] In the embodiment, the moving blade 126 is arranged inside the static blade 125, i.e., the static blade 125 covers the moving blade 126. The specific structure of the static blade 125 and the moving blade 126 can be selected and designed according to the type of the blade head 120. For example, when the blade head 120 is a short beard blade head 120, the static blade 125 adopts an arc-shaped blade net with multiple mesh holes, and the moving blade 126 is designed as a blade with an arc-shaped strip-shaped blade edge. When the blade head 120 is a long beard blade head 120, the static blade 125 and the moving blade 126 are both designed as a blade structure with shearing teeth on both sides. The mounting frame 121 includes a frame body 1211 and an end cover 1212, so that the static blade 125 is fixed to the frame body 1211, and the two ends of the static blade 125 can be connected with the two end covers 1212 or can not be connected with the two end covers 1212. The static blade 125 and the frame body 1211 can be fixedly connected by welding, insertion or the like. The frame body 1211 is specifically a static blade frame for providing installation for the static blade 125, and the end cover 1212 can avoid the end of the static blade 125 from being exposed. The specific structure of the frame body 1211 can be selected and designed according to the type of the blade head 120, which is not specifically limited here.

[0151] In fact, the moving blade 126 is connected with the driving shaft 22 of the linear motor. When the linear motor drives the moving blade 126 to reciprocate in the first direction, the whole blade head 120 will inevitably swing slightly in the first direction, i.e., the two ends of the blade head 120 will rotate around the output shaft of the linear motor in the first direction. Therefore, the width of the cross section of the guide section 123 in the first direction is greater than the width in the second direction, i.e., the size of the guide section 123 in the moving direction of the moving blade 126 is greater than the size in other directions, so that space is provided for the slight deflection of the two ends of the blade head 120, avoiding interference caused by slight rotation of the whole blade head 120 left and right when the blade head 120 floats up and down along the guide rod 111.

[0152] The static blade 125 is provided with an end cover 1212 at each end in the first direction, so that the whole blade head 120 is provided with the limiting protrusion 124 at each end in the first direction. The inner wall of each end of the shell 210 in the first direction is provided with a buffer lining 220, so that the whole blade head 120 can be limited and matched by the limiting protrusion 124 and the buffer lining 220 at each end in the first direction, which can balance the limiting of the blade head 120 at both ends in the first direction and comprehensively reduce the noise of the floating of the blade head 120. In addition, only one buffer lining 220 is arranged on the inner wall of each end of the shell 210 in the first direction, instead of arranging buffer linings 220 on the inner periphery of the whole shell 210, which can effectively reduce the volume of the buffer lining 220, and is conducive to realizing the light weight and miniaturization of the whole trimmer blade head 120.

[0153] Further, as shown in FIG. 13, FIG. 17 and FIG. 19, the plurality of cutter heads 120 are arranged side by side in the second direction, and the end cap 1212 at each end of each cutter head 120 is provided with the limiting protrusion 124; the plurality of limiting protrusions 124 at the same end in the first direction are in limiting cooperation with one of the buffer liners 220.

[0154] In this embodiment, the trimmer cutter head 120 is provided with a plurality of cutter heads 120, so that the trimming area of the trimmer cutter head 120 can be increased, thereby improving the shearing efficiency. The types of the plurality of cutter heads 120 can be the same or different, and can be selected and designed according to actual needs, which are not specifically limited herein. The limiting protrusion 124 is provided on the end cap 1212 at each end of each cutter head 120 in the first direction. The plurality of limiting protrusions 124 at the same end of the plurality of cutter heads 120 in the first direction can simultaneously be in limiting cooperation with the buffer liner 220 at the same end, that is, the plurality of limiting protrusions 124 at the same end share one buffer liner 220, which can reduce the manufacturing cost and simplify the installation steps compared with the way of sleeving the buffer sleeve on each limiting protrusion 124.

[0155] Further, as shown in FIG. 16, FIG. 21 and FIG. 22, the cooperation part 221 has a first cooperation surface 222 and a second cooperation surface 223, the second cooperation surface 223 is higher than the first cooperation surface 222; the plurality of cutter heads 120 include a middle cutter head 127 and side cutter heads 128 arranged on both sides of the middle cutter head 127 in the second direction, the limiting protrusion 124 of the middle cutter head 127 is in limiting cooperation with the first cooperation surface 222, and the limiting protrusion 124 of the side cutter head 128 is in limiting cooperation with the second cooperation surface 223.

[0156] In this embodiment, generally, the side cutter head 128 is designed as a short hair cutter head 120, and the middle cutter head 127 is designed as a long hair cutter head 120 or a short hair cutter head 120. The cooperation part 221 of the insulating liner is provided with the first cooperation surface 222 and the second cooperation surface 223 with different heights, so that the limiting protrusions 124 of the middle cutter head 127 and the side cutter head 128 are not in abutment with the buffer liner 220 in the same plane, which can effectively avoid the interference between the limiting protrusions 124 of the adjacent two cutter heads 120. In addition, the second cooperation surface 223 is higher than the first cooperation surface 222, so that the spacing between the second cooperation surface 223 and the cutter seat 110 is greater than the spacing between the first cooperation surface 222 and the cutter seat 110, so that the limiting protrusion 124 on the side cutter head 128 has sufficient up-and-down floating space 225.

[0157] In an embodiment, referring to FIG. 15, FIG. 19 to FIG. 22, the buffer lining 220 further comprises a buffer portion 224, the fitting portion 221 is arranged on a side wall surface of the buffer portion 224 facing the cutter head 120, and the buffer portion 224 is arranged below the fitting portion 221 to form a floating space 225 for the limiting protrusion 124 to float up and down.

[0158] In the embodiment, the buffer portion 224 is integrally arranged with the fitting portion 221. By arranging the buffer lining 220 to further comprise the buffer portion 224 and arranging the buffer portion 224 below the fitting portion 221 to form the floating space 225 for the limiting protrusion 124 to float up and down, the buffer lining 220 can not only buffer and absorb the collision of the limiting protrusion 124 when floating up, but also can buffer and protect the limiting protrusion 124 during the entire floating up and down process, thereby effectively avoiding the limiting protrusion 124 from emitting scraping and irritating noise when floating up and down, and further reducing the floating noise of the cutter head assembly 100.

[0159] Further, the buffer portion 224 is concave towards the side wall surface of the cutter head 120 to form the floating space 225 together with the fitting portion 221. In this way, the limiting protrusion 124 protruding on the end cover 1212 can directly extend into the floating space 225 to float up and down, and when the cutter head 120 floats up, the limiting protrusion 124 can move from the floating space 225 to abut against the fitting portion 221, which can simplify the structure of the buffer lining 220 and improve the cooperation reliability of the limiting protrusion 124 and the buffer lining 220.

[0160] In an embodiment, referring to FIG. 15, FIG. 16, FIG. 19 and FIG. 22, an inner wall of the shell 210 is provided with an embedding groove 211, and the buffer lining 220 is adapted to be embedded in the embedding groove 211. In this way, on the one hand, the installation convenience and connection stability of the buffer lining 220 and the shell 210 are improved, and on the other hand, the thickness of the entire cutter head shell assembly 200 can be effectively thinned, which is conducive to realizing the miniaturization and light weight of the entire trimmer cutter head 120.

[0161] Further, as shown in FIG. 21 and FIG. 22, a side wall of the embedding groove 211 in the first direction is provided with a mounting seat 212, the buffer lining 220 is provided with a fitting groove 226 corresponding to the mounting seat 212, the mounting seat 212 is adapted to be embedded in the fitting groove 226, and a bottom wall of the mounting seat 212 is exposed outside the buffer lining 220 to be fixedly connected with the cutter seat 110.

[0162] In the embodiment, the rigidity and hardness of the shell 210 are higher than those of the buffer liner 220, so that the mounting seat is arranged on the inner wall of the shell 210 and fixedly connected with the tool holder 110, so as to ensure the stability and reliability of the connection between the tool holder 110 and the entire tool head shell set 200. In addition, the matching groove 226 adapted to the mounting seat 212 is arranged on the buffer liner 220, so as to increase the limiting and matching area of the buffer liner 220 and the shell 210, and the cooperation between the matching groove 226 and the mounting seat 212 can limit the relative movement of the buffer liner 220 and the shell 210 in the second direction, thereby improving the limiting and matching effect of the buffer liner 220 and the shell 210.

[0163] Further, referring to FIGS. 14, 15, 19-22 and 25, the tool holder 110 has a main body 112 and mounting lugs 113 connected to both ends of the main body 112 in the first direction; the tool head 120 is floatingly mounted on the main body 112 in the up-down direction; the bottom wall of the buffer liner 220 is provided with a mounting groove 227, and the bottom wall of the mounting seat 212 is exposed to the mounting groove 227; the mounting lugs 113 are embedded in the mounting groove 227 and fixedly connected with the mounting seat 212.

[0164] In the embodiment, the mounting lugs 113 are adapted to be embedded in the mounting groove 227 of the buffer liner 220, so that the mounting lugs 113 do not protrude from the buffer liner 220, thereby ensuring the flatness of the bottom surface of the entire trimmer tool head 120. After the mounting lugs 113 are embedded in the mounting groove 227 of the buffer liner 220 and fixedly connected with the mounting seat 212, the entire buffer liner 220 can be clamped between the mounting lugs 113 of the tool holder 110 and the shell 210 in the up-down direction, thereby achieving the up-down limiting and fixing of the buffer liner 220 and the shell 210. In this way, the tool holder 110 is used to limit the buffer liner 220, and no additional connecting structure is needed to connect the buffer liner 220 and the shell 210, thereby reducing the number of parts and simplifying the installation steps.

[0165] Specifically, the mounting seat 212 is provided with a mounting hole 213, the mounting lug 113 is provided with a fixing hole 114, and the trimmer tool head 120 further includes a fastener 300, which is connected with the mounting hole 213 and the fixing hole 114 to fixedly connect the tool holder 110 and the tool head shell set 200.

[0166] The fastener 300 can be a screw, and the mounting hole 213 is a threaded hole. During installation, the buffer liner 220 is first embedded in the embedding groove 211 of the shell 210, then the mounting lug 113 of the tool holder 110 is embedded in the mounting groove 227 on the buffer liner 220, and finally the fastener 300 is threaded through the fixing hole 114 of the mounting lug 113 and is screwed with the mounting hole 213 to fixedly connect the tool holder 110, the buffer liner 220 and the shell 210. The mounting lug 113 and the mounting seat 212 are connected by the fastener 300, which is simple, reliable and easy to operate.

[0167] In an embodiment, as shown in FIGS. 19-22, the buffer liner 220 further includes an extension 228 connected to the two side edges of the buffer portion 224 in the second direction, and the fitting portion 221 and the floating space 225 extend to the outer side edges of the extension 228 in the second direction. By providing the extension 228, the fitting portion 221 and the floating space 225 can be widened, and the buffering and damping effect of the buffer liner 220 on the tool bit 120 can be further improved.

[0168] Further, the extension 228 is arranged at the side end of the buffer portion 224 close to the tool bit 120, and the inner wall surface of the shell 210 is provided with a fixing groove 214 for fitting the extension 228. In this way, the fitting stability of the extension 228 and the shell 210 can be improved, and the connection reliability of the entire buffer liner 220 and the shell 210 can be ensured.

[0169] Further, referring to FIGS. 14, 19, 21, 22 and 25, the buffer liner 220 further includes a fixing lug 229 arranged at both sides of the fitting groove 226 in the second direction; the fixing lug 229 and the fitting portion 221 are arranged at the upper and lower ends of the buffer portion 224, respectively; the bottom wall of the shell 210 is provided with a limiting groove 215 for fitting the fixing lug 229; and the fixing lug 229 and the extension 228 are spaced apart and sandwich the shell 210.

[0170] In this embodiment, by providing the limiting lug, the displacement of the buffer liner 220 relative to the shell 210 in the first direction and the second direction can be limited, and therefore no additional connecting structure is needed to connect the buffer liner 220 and the shell 210. In addition, the fixing lug 229 is spaced apart from the extension 228, and a dovetail groove structure is formed therebetween. The shell 210 is provided with an embedding flange corresponding to the dovetail groove, so that the fixing lug 229 and the extension 228 are sandwiched by the shell 210. In this way, the limiting reliability of the buffer liner 220 and the shell 210 in the first direction and the second direction can be further ensured.

[0171] In an embodiment, as shown in FIG. 15 and FIG. 16, the end cover 1212 is provided with a guide hole 122, and the width of the cross section of the guide section 123 in the first direction gradually increases from bottom to top.

[0172] The knife seat 110 is provided with a guide hole 122, and the width of the cross section of the guide section 123 in the first direction gradually decreases from bottom to top.

[0173] It can be understood that since the cutter head 120 is deflected up and down around the driving shaft 22 of the linear motor, the required rotation space of the guide rod 111 at its free end gradually increases. When the guide hole 122 is provided on the end cover 1212, by gradually increasing the width of the cross section of the guide section 123 in the first direction from bottom to top; when the guide hole 122 is provided on the knife seat 110, by gradually decreasing the width of the cross section of the guide section 123 in the first direction from bottom to top; when the cutter head 120 is slightly rotated to the limit position, the wall surface of the guide section 123 in the first direction can be adapted to fit the guide rod 111, and the gap between the guide section 123 near the connecting end of the guide rod 11 and the guide rod 111 is small. Compared with the way of setting the cross-sectional size of the entire guide section 123 in the first direction to be larger and consistent, the collision noise can be reduced, the guide rod 111 and the guide hole 122 can be effectively guided and matched, and the guiding accuracy can be improved.

[0174] The present application also provides a hair trimmer, please refer to FIG. 23 to FIG. 25, the hair trimmer is an electric trimmer, the electric trimmer includes a main machine 20 and a trimmer cutter head 120, the specific structure of the trimmer cutter head 120 is referred to the above embodiment, the main machine 20 includes a machine shell 21 and a driving shaft 22, the cutter head shell group 200 of the trimmer cutter head 120 is connected with the machine shell 21, and the driving shaft 22 is connected with the cutter head assembly 100 of the trimmer cutter head 120. Since the electric trimmer adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0175] The electric trimmer can be a shaver. The shape of the housing 21 can be selected and designed according to actual needs, which is not specifically limited here. The cutter head shell group 200 and the housing 21 can be detachably connected or non-detachably connected, and the specific connection mode of the two can be many, which is not limited here. The electric trimmer further comprises a linear motor, and the linear motor has a driving shaft 22 connected with the moving cutter 126 of the cutter head assembly 100 to drive the moving cutter 126 to reciprocate relative to the fixed cutter 125 in the first direction. The number of linear motors can be selected and designed according to the number of cutter heads 120. For example, the linear motor can be provided as one or two. The structure of the linear motor can refer to the existing design, which will not be repeated here.

[0176] The driving assembly in the electric shaver makes the moving cutter holder reciprocate, and the moving cutter holder drives the moving cutter to reciprocate. Therefore, whether the moving cutter and the moving cutter holder are firmly connected is very important. If the connection between the moving cutter and the moving cutter holder is not firm, a series of adverse consequences may occur, which may cause excessive noise of the electric shaver, increase equipment wear, etc.

[0177] The above content is only used to assist in understanding the technical solutions of the application, and does not mean that the above content is prior art.

[0178] In order to solve the above problems, please refer to FIGS. 26-33, the third scheme of the present application proposes a cutter head device.

[0179] Referring to FIGS. 26, 27, 28, 30 and 31, in the embodiment of the present application, the cutter head device is a moving cutter assembly 100, which comprises a moving cutter 10 and a moving cutter holder 20. The moving cutter 10 generally refers to the moving part in the shaver head, which is usually composed of one or more rows of blades. These blades cooperate with the fixed cutter 50 to shear hair. The moving cutter 10 is generally sharp and has good cutting ability to ensure that the shaving effect is clean and fast. The external contour of the moving cutter 10 is usually rectangular, and the external contour of the moving cutter 10 can also be set in other shapes, which will not be enumerated here. The moving cutter 10 is usually made of stainless steel, such as 3Cr13, 4Cr13, 6Cr13 ferritic stainless steel. Since stainless steel has good strength and ductility, it can be pressed into a thin sheet through stamping process, and the tooth part 12 can also be stamped in one step. The moving cutter holder 20 is a component that supports and fixes the moving cutter 10. In the electric shaver, when the shaver is turned on, the driving device generates a reciprocating linear motion. This motion is transmitted to the moving cutter 10 through the moving cutter holder 20, so that the moving cutter 10 reciprocates at high speed, thereby shearing hair.

[0180] The moving cutter 10 includes a body 11 and a tooth portion 12, both of which extend in the first direction. The body 11 is the main part of the moving cutter 10. The body 11 is provided with a fixing hole 1112 that penetrates the body 11 in the thickness direction of the body 11. The body 11 is matched with the moving cutter seat 20 through the fixing hole 1112, so that the moving cutter seat 20 supports and fixes the moving cutter 10. The tooth portion 12 is connected to the side edge of the body 11 extending in the first direction, and can capture and guide the beard that needs to be trimmed or cut, so as to achieve accurate trimming and cutting effect.

[0181] The moving cutter seat 20 includes a hot melting protrusion 222, a connecting portion 23, and a seat body 21. The connecting portion 23 is used to be connected with the driving device. Specifically, when the driving device reciprocates, the connecting portion 23 can transmit power and motion, so that the moving cutter 10 reciprocates in the first direction to complete the shearing of the hair.

[0182] The hot melting protrusion 222 is inserted into the fixing hole 1112, so that the moving cutter 10 and the moving cutter seat 20 are limited. The hot melting protrusion 222 is designed to be hot melt connected with the moving cutter 10 at the fixing hole 1112, so as to firmly combine the moving cutter seat 20 and the moving cutter 10. This connection mode can provide stronger combination force, so as to ensure that the connection between the moving cutter seat 20 and the moving cutter 10 is firm and reliable. By hot melt connecting the hot melting protrusion of the moving cutter seat and the moving cutter, the noise between the moving cutter and the moving cutter seat can be reduced, and the wear of the moving cutter can also be reduced. At the same time, the hot melt connection is also helpful to realize the miniaturization and light weight of the moving cutter assembly 100. Specifically, compared with other connection modes, the hot melt connection does not need additional connecting components, reduces the number of parts, and reduces the overall volume of the moving cutter assembly 100; and the hot melt connection can reduce the size of the connecting component while improving the structural strength, so as to reduce the overall weight of the moving cutter assembly 100. In addition,

[0183] The hot melting protrusion 222 is arranged on the side of the seat body 21 facing the moving cutter 10, and the connecting portion 23 is arranged on the side of the seat body 21 away from the moving cutter 10, that is, the hot melting protrusion 222 and the connecting portion 23 are arranged on the two sides of the seat body 21 in the thickness direction. The hot melting protrusion 222 and the connecting portion 23 realize functional division in the thickness direction, which can effectively utilize the space, reduce the overall volume of the moving cutter assembly 100, and at the same time maintain the independence and integrity of the functions of each part. At the same time, distributing components with different functions on the two sides in the thickness direction can reasonably disperse and transmit the working load, reduce local stress concentration, and prolong the service life of the moving cutter assembly 100.

[0184] The moving knife assembly 100 provided in the application comprises a moving knife 10 and a moving knife seat 20. The moving knife 10 comprises a body 11 and a tooth part 12, the tooth part 12 is connected to the side of the body 11 in the first direction, the body 11 is provided with a fixing hole 1112, the fixing hole 1112 penetrates the body 11 in the thickness direction of the body 11. The moving knife seat 20 comprises a seat body 21, a hot melting convex part 222 and a connecting part 23, the hot melting convex part 222 is arranged on the side of the seat body 21 facing the moving knife 10, the hot melting convex part 222 is inserted into the fixing hole 1112 and is hot melt connected with the moving knife 10 at the fixing hole 1112; the connecting part 23 is arranged on the side of the seat body 21 away from the moving knife 10, and the connecting part 23 is used for being connected with a driving device. The moving knife assembly 100 of the embodiment can firmly connect the moving knife 10 and the moving knife seat 20 by hot melt connecting the hot melting convex part 222 of the moving knife seat 20 with the moving knife 10, so as to ensure that the moving knife 10 and the moving knife seat 20 will not be loose or fall off during use, can reduce the noise between the moving knife 10 and the moving knife seat 20, and can also reduce the wear of the moving knife 10.

[0185] Further, referring to FIG. 31, the side of the seat body 21 facing the moving knife 10 is provided with a connecting convex block 221; the body 11 is provided with a connecting hole 1111, the connecting hole 1111 penetrates the body 11 in the thickness direction of the body 11, and the connecting convex block 221 is inserted into the connecting hole 1111. The connecting convex block 221 and the connecting hole 1111 can provide a force receiving part for moving the moving knife 10 with the moving knife seat 20, avoid the hot melt connection between the hot melting convex part 222 and the moving knife from being broken, and ensure the stability of the connection between the moving knife 10 and the moving knife seat 20.

[0186] In some embodiments, the length of the connecting convex block 221 in the first direction is greater than the length of the hot melting convex part 222 in the first direction. In some embodiments, the length of the connecting convex block 221 in the second direction is greater than the length of the hot melting convex part 222 in the second direction, and the first direction, the second direction and the thickness direction are arranged perpendicular to each other in pairs. On the one hand, the larger size of the connecting convex block 221 facilitates the alignment and fixed positioning installation of the moving knife seat 20 and the moving knife 10; on the other hand, the larger size of the connecting convex block 221 can bear greater force and torsion, so that the connection relationship between the moving knife 10 and the moving knife seat 20 is more reliable.

[0187] In an embodiment, referring to FIGS. 29-31, the body 11 is recessed towards the moving knife seat 20 to form an assembly groove 112. The groove wall of the assembly groove 112 and the tooth portion 12 form a bend. The bend causes the moving knife 10 to generate a higher bending stress along the bend line, thereby increasing the bending and load capacity of the structure of the moving knife 10. The bottom wall of the assembly groove 112 is provided with a connecting hole 1111 and a fixing hole 1112, and the end of the hot melt convex portion 222 after hot melting is in the assembly groove 112. In this way, the assembly groove 112 provides installation space for the end of the hot melt convex portion 222 after hot melting, avoids interference between the end of the hot melt convex portion 222 after hot melting and the static knife 50, makes the tooth portion 12 of the moving knife 10 tightly fit with the static knife 50, and also makes the structure of the moving knife assembly 100 more compact.

[0188] Further, referring to FIGS. 30 and 31, the connecting hole 1111 extends to the side wall of the assembly groove 112 adjacent to the bottom wall of the assembly groove 112, and the two ends of the connecting convex block 221 in the first direction abut against the side wall of the assembly groove 112 and the bottom wall of the assembly groove 112, respectively. In this embodiment, by extending the connecting hole 1111 to the side wall of the assembly groove 112 adjacent to the bottom wall of the assembly groove 112, a part of the connecting hole 1111 is formed on the side wall of the assembly groove 112. When the connecting convex block 221 is inserted into the connecting hole 1111, the connecting convex block 221 is exposed on the side wall of the assembly groove 112, the two ends of the connecting convex block 221 in the first direction abut against the side wall of the assembly groove 112 and the bottom wall of the assembly groove 112, respectively, which can increase the contact area between the body 11 of the moving knife 10 and the connecting convex block 221, and avoid the distortion of the moving knife 10 due to the small stress area when the moving knife seat 20 drives the moving knife 10 to reciprocate.

[0189] Further, referring to FIGS. 29, 31, 32 and 33, the moving knife seat 20 includes a plurality of hot melt convex portions 222, the plurality of hot melt convex portions 222 are distributed on both sides of the connecting convex block 221 in the first direction, and the connecting convex block 221 is arranged corresponding to the position of the connecting portion 23. In this way, the stability and reliability of the connection between the moving knife 10 and the moving knife seat 20 can be ensured. Further, the plurality of hot melt convex portions 222 are uniformly distributed on both sides of the hot melt convex portion 222 in the first direction.

[0190] In this way, the plurality of hot melt convex blocks can be distributed around the connecting portion 23, thereby ensuring that the mass distribution of the moving knife seat 20 is uniform, and then the connection between the moving knife seat 20 and the driving shaft is in a balanced state, reducing the vibration and imbalance phenomenon caused by imbalance, and improving the stability of mechanical transmission.

[0191] The application also provides a cutter head device. The cutter head device is a cutter head module 200, which comprises a static cutter 50, a support 30, and the above-mentioned dynamic cutter assembly 100. The specific structure of the dynamic cutter assembly 100 is referred to the above-mentioned embodiments. Since the cutter head module 200 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. The static cutter 50 is fixedly connected to the support 30. The dynamic cutter assembly 100 is located on the side of the static cutter 50 close to the support 30, and the dynamic cutter assembly 100 is movably arranged on the support 30.

[0192] Further, referring to FIGS. 26, 27, 32 and 33, the cutter head module 200 further comprises at least two elastic members 40. The elastic member includes but is not limited to a spring and a spring piece. One end of the elastic member 40 abuts against the seat body 21, and the other end of the elastic member 40 abuts against the support 30. The elastic member 40 makes the dynamic cutter 10 always closely fit the static cutter 50 during reciprocating movement, thereby achieving efficient trimming and cutting effect.

[0193] Further, referring to FIGS. 30 to 33, the elastic member 40 is a spring. The seat body protrudes a plurality of first spring seats 211 away from the dynamic cutter 10, and the plurality of first spring seats 211 are arranged on both sides of the connecting portion in the first direction. The side of the support 30 facing the seat body protrudes a plurality of second spring seats 31. Each first spring seat 211 is arranged corresponding to each second spring seat 31. The two ends of the spring are respectively sleeved in the first spring seat 211 and the second spring seat 31. The first spring seat 211 and the second spring seat 31 can provide a fixed position for the spring, so as to ensure that the spring will not deviate or move when the dynamic cutter 10 reciprocates, and ensure its normal function.

[0194] The application also provides a hair trimmer, which is an electric shaver. The electric shaver comprises the above-mentioned cutter head module 200. The specific structure of the cutter head module 200 is referred to the above-mentioned embodiments. Since the electric shaver adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0195] With the increasing requirement of comfort and efficiency of hair trimming, multi-cutter head hair trimmers, such as multi-cutter head shavers, have emerged, which can shave more thoroughly. The multi-cutter head shaver usually comprises a long hair cutter head and short hair cutter heads located on both sides of the long hair cutter head. In the prior art, the fixed cutter width of the long hair cutter head is large. If the shaver is required to be small in size and suitable for holding and storing, the gap for hair entering between the short hair cutter heads and the long hair cutter head will be small, and longer beard is difficult to enter the long hair cutter head for shearing, resulting in low shearing efficiency.

[0196] The above merely serves to assist in understanding the technical solutions of the application and does not represent an acknowledgement that the above is prior art.

[0197] To solve the above problems, please refer to FIG. 34 to FIG. 39, the fourth aspect of the present application provides a cutter head device for a hair trimmer.

[0198] In the embodiments of the present application, please refer to FIG. 34 to FIG. 39, the cutter head device is a cutter head assembly 100, the cutter head assembly 100 includes a long hair cutter head 110 and two short hair cutter heads 120, the long hair cutter head 110 includes a fixed blade 111 in the shape of a long strip flat plate, a plurality of cutting teeth 112 are spaced apart along a second direction on both sides of the fixed blade 111 in a first direction, and a cutting groove 1120 is formed between adjacent two cutting teeth 112; the two short hair cutter heads 120 are respectively arranged on opposite sides of the long hair cutter head 110, and are respectively arranged with a spacing from the long hair cutter head 110, an entry gap 130 extending along the second direction is formed between the end 1129 of the cutting tooth 112 and the long hair cutter head 110, and the cutting groove 1120 and the entry gap 130 are communicated, so that the to-be-cut objects enter the cutting groove 1120 through the entry gap 130.

[0199] In the embodiments of the present application, the fixed blade 111 has a first direction, a second direction and a third direction, the first direction is the width direction of the fixed blade 111, the second direction is the length direction of the fixed blade 111, and the third direction is the thickness direction of the fixed blade 111. The present application forms the entry gap 130 between the end 1129 of the cutting tooth 112 and the long hair cutter head 110 by respectively spacing the two short hair cutter heads 120 on opposite sides of the long hair cutter head 110, the entry gap 130 is in the shape of a long strip extending along the second direction, there is no other part shielding between the cutting tooth 112 and the short hair cutter head 120, and the cutting groove 1120 and the entry gap 130 are communicated, so that the width of the entry gap 130 is increased and the longer hair can smoothly enter the cutting groove 1120 through the entry gap 130, at the same time, the hair can also enter the cutting groove 1120 in the thickness direction of the fixed blade 111, the amount of entering hair is increased, and the cutting efficiency of the hair trimmer is improved. Secondly, in the case that the width of the short hair cutter head 120 and the width of the cutter head assembly 100 are unchanged, the fixed blade 111 in the shape of a long strip flat plate can be set to a smaller width, thereby increasing the entry gap 130 between the short hair cutter head 120 and the long hair cutter head 110, increasing the amount of entering hair, and improving the cutting efficiency of the hair trimmer. The fixed blade 111 of the long hair cutter head 110 in the prior art is usually set to a convex or concave shape, which increases the volume of the fixed blade 111, thereby increasing the volume of the hair trimmer. The present application sets the fixed blade 111 to a long strip flat plate, which can reduce the volume of the fixed blade 111 while maintaining a certain width, thereby reducing the volume of the hair trimmer.

[0200] Further, in an embodiment, the long hair cutter head 110 further comprises a fixed cutter support 113 fixedly connected to the bottom side of the fixed cutter 111, and the fixed cutter support 113 is located on the side of the short hair cutter head 120 away from the bottom wall 1121 of the shearing groove 1120, and a gap 130 is formed between the side plate 1131 of the fixed cutter support 113 facing the short hair cutter head 120 and the short hair cutter head 120.

[0201] In this embodiment, the first end cover 114 is a square body, and the second end cover 122 is a fan-shaped column, and the top surface and each edge of the first end cover 114 and the second end cover 122 are all provided with rounded corners. The top surface and the edge with rounded corners are smoother, reducing the scratching and irritation when the end cover contacts the skin during the hair trimming process. Users will feel more comfortable during use, especially for sensitive skin. The smooth rounded corner top surface and edge reduce the possibility of hair being stuck or entangled during trimming, ensuring that the cutter head assembly 100 slides freely on the facial contour, providing a smoother hair trimming experience and a cleaner hair trimming effect, and improving the working efficiency of the cutter head assembly 100. Secondly, by arranging the first end cover 114 and the second end cover 122 adjacent and spaced apart in the first direction, it is ensured that there is a certain distance between the short hair cutter head 120 and the long hair cutter head 110, increasing the width of the hair entry gap 130, thereby increasing the amount of hair entering and improving the shearing efficiency.

[0202] Further, in an embodiment, referring to FIGS. 34, 35 and 37, the long hair cutter head 110 further comprises two first end covers 114 respectively mounted on both ends of the fixed cutter 111 in the second direction; the short hair cutter head 120 is arranged side by side with the long hair cutter head 110 in the first direction, and the short hair cutter head 120 comprises a second end cover 122 corresponding to and spaced apart from the first end cover 114.

[0203] In this embodiment, the first end cover 114 is a square body, and the second end cover 122 is a fan-shaped column, and the top surface and each edge of the first end cover 114 and the second end cover 122 are all provided with rounded corners. The top surface and the edge with rounded corners are smoother, reducing the scratching and irritation when the end cover contacts the skin during the hair trimming process. Users will feel more comfortable during use, especially for sensitive skin. The smooth rounded corner top surface and edge reduce the possibility of hair being stuck or entangled during trimming, ensuring that the cutter head assembly 100 slides freely on the facial contour, providing a smoother hair trimming experience and a cleaner hair trimming effect, and improving the working efficiency of the cutter head assembly 100. Secondly, by arranging the first end cover 114 and the second end cover 122 adjacent and spaced apart in the first direction, it is ensured that there is a certain distance between the short hair cutter head 120 and the long hair cutter head 110, increasing the width of the hair entry gap 130, thereby increasing the amount of hair entering and improving the shearing efficiency.

[0204] Further, in an embodiment, referring to FIG. 38 and FIG. 39, the width of the cutting slot 1120 is gradually increased from inside to outside in the third direction. The gradually increased width of the cutting slot 1120 makes it easier for the hair to be guided into the cutting slot 1120, while also playing a role in combing the hair, and the wider entrance can capture more hair, especially whiskers of different directions and lengths, thereby increasing the amount of hair entering. The gradually increased width allows the hair to enter the cutting slot 1120 from multiple angles in the thickness direction of the fixed blade 111, improving the ability of the shaver to capture whiskers of different growth directions. Secondly, the width of the cutting slot 1120 at the bottom is small, which can effectively keep the hair in the cutting slot 1120 and not easily escape during the cutting process. This arrangement ensures that the hair entering the cutting slot 1120 can be smoothly cut, improving the cutting efficiency. Since the hair can be kept in the cutting slot 1120, the cutting effect is cleaner and more complete, reducing the residual hair that is not completely cut, and improving the overall effect of shaving.

[0205] Specifically, the two opposite side walls 1122 of the cutting slot 1120 form cutting edges 115 that cooperate with the moving blade for cutting at the inner edges in the third direction, and the two cutting edges 115 are arranged in parallel.

[0206] In this embodiment, the two parallel cutting edges 115 provide symmetrical friction and resistance to the hair during the cutting process, ensuring that the lateral force on the hair during the cutting process is evenly distributed, keeping the hair in a fixed position and reducing the likelihood of the hair slipping sideways and escaping from the cutting slot 1120, thereby improving the cutting efficiency of the hair trimmer.

[0207] Further, the bottom wall 1121 of the cutting slot 1120 includes two circular arc surfaces 1124 and a connecting surface 1125 connected between the two circular arc surfaces 1124, and the two circular arc surfaces 1124 are connected to the two opposite side walls 1122 of the cutting slot 1120, respectively.

[0208] In this embodiment, the circular arc surfaces 1124 are inclined from inside to outside in the third direction and away from the direction of the opening of the cutting slot 1120, and the connecting surface 1125 is located between the two circular arc surfaces 1124 and connected to the two circular arc surfaces 1124, increasing the width of the top surface of the bottom wall 1121 of the cutting slot 1120 to guide more hair into the cutting slot 1120. By connecting the circular arc surfaces 1124 to the side walls 1122 of the cutting slot 1120, the corners of the bottom wall 1121 are smoother, reducing the sharp edges when the long shaver head 110 contacts the skin, reducing skin irritation, and providing a more comfortable hair trimming experience. The smooth corner design reduces the scratching and potential scratching of the skin during use of the shaver head assembly 100, increasing the safety of the shaver head assembly 100.

[0209] Further, in an embodiment, the opposite two side walls 1122 of the cutting slot 1120 are at least partially inclined away from each other from inside to outside in the third direction.

[0210] In the present embodiment, when the opposite two side walls 1122 of the cutting slot 1120 are all inclined away from each other from inside to outside in the third direction, a reverse trapezoidal structure with the top being wide and the bottom being narrow is formed, so that the cutting teeth 112 are similar to comb teeth, without the need to additionally increase the comb tooth structure, so that the structure of the cutter head assembly 100 is more simple, thereby increasing the width of the hair entry gap 130. Such design can effectively comb the hair and guide the hair to smoothly enter the cutting slot 1120, reducing the phenomenon of hair being stuck. When the two side walls 1122 are partially inclined, the convex portions can provide a larger contact area for the skin, improving the comfort of hair trimming.

[0211] Specifically, in the embodiments of the present application, the side wall 1122 of the cutting slot 1120 has a first section 1126 connected with the bottom wall 1121 of the cutting slot 1120 and a second section 1127 connected to the side of the first section 1126 away from the bottom wall 1121, the first section 1126 is inclined away from each other from inside to outside in the third direction, so that the second section 1127 is convex relative to the first section 1126.

[0212] The inclination of the first section 1126 so that the second section 1127 is convex relative to the first section 1126 can increase the area of the top wall 1123 of the tip 1129 of the cutting tooth 112. The width of the top wall 1123 of the tip 1129 is greater than the width of the top wall 1123 of the root 1128, which can increase the contact area of the skin with the cutting tooth 112, more evenly distribute the pressure when the cutter head assembly 100 contacts the skin, reduce the pressure of the cutting tooth 112 on the skin, and improve the comfort of use. The first section 1126 forms a trapezoidal structure with the top being narrow and the bottom being wide, similar to comb teeth, without the need to additionally increase the comb tooth structure, so that the structure of the cutter head assembly 100 is more simple, thereby increasing the width of the hair entry gap 130.

[0213] Further, in an embodiment, the top wall 1123 of the cutting tooth 112 is smoothly transitioned from the root 1128 to the tip 1129 and is inclined downward.

[0214] In existing technologies, the ends 1129 of the cutting teeth 112 are typically provided with upward-curving protective protrusions. These protrusions prevent the fixed blade 111 from closely adhering to the skin surface, creating a gap. Due to this lack of close contact, beards or hairs cannot be effectively pushed into the cutting gap of the fixed blade 111, making it difficult for the long beard trimmer head 110 to effectively cut long beards, thus affecting the cutting effect. Secondly, the upward-curving protective protrusions also reduce the number of hairs entering the cutting area, resulting in a smaller amount of hair cut each time and reduced cutting efficiency. These problems make existing hair trimmers unsatisfactory in use, especially when dealing with longer hair, leading to a poor user experience. In this embodiment, the thickness of the ends 1129 of the cutting teeth 112 is less than the thickness of the root 1128, and the top wall 1123 of the cutting teeth 112 smoothly transitions from the root 1128 to its ends 1129 and is inclined downwards, allowing the cutting teeth 112 to adhere more closely to the skin surface. This close fit reduces the gap between the fixed blade 111 and the skin, ensuring that hair can be effectively pushed into the cutting gap, thus improving the accuracy and efficiency of cutting.

[0215] It should be noted that all edges and corners of the cutting teeth 112 are rounded to reduce scratching and irritation to the skin during use, thus improving the comfort and safety of the trimming process.

[0216] Furthermore, the shaving head 120 includes a fixed blade mesh 121, which is arranged side-by-side with the fixed blades 111. The top of the fixed blade mesh 121 is arc-shaped, and the highest point of the fixed blade mesh 121 is higher than or level with the highest point of the fixed blades 111. This arrangement allows for a more effective fit to the skin, especially at the edges of the facial contours, improving the precision and effectiveness of hair trimming. The closer fit of the fixed blade mesh 121 to the skin allows the razor to more precisely capture and cut each hair, effectively trimming even the fine hairs at the edges of the facial contours, thus improving the overall trimming effect and quality.

[0217] This application also proposes a hair trimmer, which includes a drive device and a blade assembly 100. The specific structure of the blade assembly 100 is as described in the above embodiments. Since this hair trimmer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The output shaft of the drive device is connected to the blade assembly 100. This hair trimmer can specifically be a razor, hair clipper, trimmer, etc., and is not specifically limited here.

[0218] Common hair trimmers include shavers, hair clippers, hair groomers, etc. The hair trimmer includes a moving blade and a static blade which are attached to each other. The moving blade is driven to move relative to the static blade by a driving mechanism to cut hair. In order to better attach to the skin, the cross section of the moving blade and the static blade is set to be U-shaped. The effective cutting area of the moving blade with the U-shaped cross section is small due to the limitation of the static blade, which results in low cutting efficiency of the whole machine.

[0219] The above description is only used to assist in understanding the technical solutions of the application and does not mean that the above description is prior art.

[0220] In order to solve the above problems, please refer to FIGS. 40 to 48, the fifth aspect of the present application provides a cutter head device for the cutter head of a hair trimmer, and cooperates with the static blade to cut hair.

[0221] In the embodiments of the present application, please refer to FIGS. 40 to 43, the cutter head device is a moving blade 100 of a hair trimmer, which includes an arc-shaped cutting part 110 and two fixed walls 120. The arc-shaped cutting part 110 includes a plurality of cutting edges arranged at intervals in a predetermined direction. The two fixed walls 120 are connected to both sides of the arc-shaped cutting part 110 in the bending direction and are located inside the outermost end of the arc-shaped cutting part 110, so that the outer side surface of each fixed wall 120 and the connecting part of the outer side surface of the arc-shaped cutting part 110 form a recessed space 140.

[0222] In the embodiments, it can be understood that the extension shape of the cross section of the arc-shaped cutting part 110 is arc-shaped. The central angle corresponding to the cross section of the arc-shaped cutting part 110 can be less than 180 degrees, or equal to or greater than 180 degrees, as long as the cross section of the arc-shaped cutting part 110 is arc-shaped. The central angle corresponding to the cross section of the arc-shaped cutting part 110 is not limited here. A plurality of cutting edges are provided on the arc-shaped cutting part 110 to cooperate with the mesh holes on the static blade 200 to achieve cutting. The specific structure of the cutting edge can refer to the existing design, which is not limited here. The fixed wall 120 is used to fix the moving blade 100 to the moving blade seat 300 or other structures.

[0223] It can be understood that the arc-shaped shearing part 110 has two outermost points in the bending direction thereof, which refer to the two outermost points of the projection of the arc-shaped shearing part 110 on the horizontal plane. Thus, when the central angle of the cross section of the arc-shaped shearing part 110 is less than or equal to 180 degrees, the two outermost points of the arc-shaped shearing part 110 in the bending direction thereof are the two end points of the arc-shaped shearing part 110 in the bending direction thereof. When the central angle of the cross section of the arc-shaped shearing part 110 is greater than 180 degrees, the two outermost points of the arc-shaped shearing part 110 in the bending direction thereof are located outside the two end points of the arc-shaped shearing part 110 in the bending direction thereof. By connecting the two fixed walls 120 to the inner side of the outermost end of the arc-shaped shearing part 110 in the bending direction thereof, a recessed space 140 can be formed at the connection between the outer side of the fixed wall 120 and the outer side of the arc-shaped shearing part 110.

[0224] FIG. 43 shows a cross-sectional view of an embodiment of the cutter head 10 of the hair clipper of the present application, wherein the dashed part indicates the existing movable cutter 100 with a U-shaped cross section. As shown in FIG. 43, the fixed wall 120 of the movable cutter 100 is used to be fixed with the movable cutter seat 300, and the arc-shaped shearing part 110 of the movable cutter 100 is used to be attached to the fixed cutter 200. If the two ends of the arc-shaped shearing part 110 of the existing movable cutter 100 with a U-shaped cross section are extended downward in the bending direction thereof, the distance between the two fixed walls 120 will be increased, and thus the gap between the fixed wall 120 and the fixed cutter 200 will be reduced, which will cause the movable cutter 100 to easily interfere and rub during the movement.

[0225] The movable cutter 100 of the hair clipper of the present application is connected to the two sides of the arc-shaped shearing part 110 in the bending direction thereof, and is located on the inner side of the outermost end of the arc-shaped shearing part 110, so that a recessed space 140 is formed at the connection between the outer side of each fixed wall 120 and the outer side of the arc-shaped shearing part 110. Thus, compared with the movable cutter 100 with a U-shaped cross section, the extension length of the arc-shaped shearing part 110 in the bending direction thereof can be effectively increased without increasing the distance between the two fixed walls 120, so that the shearing edges on the arc-shaped shearing part 110 can be arranged to be longer, the effective shearing area of the movable cutter 100 is increased, and the shearing efficiency of the whole machine is improved.

[0226] In the present application, the outer side of the arc-shaped shearing part 110 and the outer side of the fixed wall 120 can be connected by an arc surface, an inclined surface, or an arc surface and an inclined surface.

[0227] In an embodiment, the outer side surface of the arc-shaped shear portion 110 is arc-shapedly connected with the outer side surface of the fixed wall 120. Compared with the arc-shaped shear portion 110 and the fixed wall 120 being connected at an oblique angle, the arc-shaped shear portion 110 and the fixed wall 120 being arc-shapedly connected can effectively avoid stress concentration and thus can improve the service life of the moving knife 100. In addition, the arc-shaped shear portion 110 and the fixed wall 120 being arc-shapedly connected can make the outer side of the moving knife 100 not have a dead angle in which hair debris is easily hidden, so that the moving knife 100 is easy to clean.

[0228] In an embodiment, as shown in FIGS. 41 to 44, the arc-shaped shear portion 110 is connected with the fixed wall 120 through a connecting portion 130. The connecting portion 130 is arranged at an angle with respect to the first direction and the second direction, and the outer side surface of the connecting portion 130 is outwardly inclined. The two fixed walls 120 are arranged at intervals in the first direction, and the first direction, the second direction and the preset direction are perpendicular to each other. That is, from the arc-shaped shear portion 110 to the two fixed walls 120, the interval between the two connecting portions 130 gradually decreases.

[0229] In the embodiment, it can be understood that the surface of the arc-shaped shear portion 110 is arc-shaped, and the surface of the fixed wall 120 is generally flat. If the arc-shaped shear portion 110 and the fixed wall 120 are directly connected, the connection portion is prone to breakage. By arranging the connecting portion 130 to connect the fixed wall 120 and the arc-shaped shear portion 110, the connecting portion 130 is bent with respect to the arc-shaped shear portion 110 and the fixed wall 120, so that the outer side surface of the fixed wall 120 and the outer side surface of the arc-shaped shear portion 110 form a recessed space 140, and the direct connection of the fixed wall 120 and the arc-shaped shear portion 110 can be effectively avoided to prevent the connection portion from being prone to breakage.

[0230] The connecting portion 130 is arranged at an angle with respect to the first direction and the second direction, and the outer side surface of the connecting portion 130 is outwardly inclined, that is, the outer side surface of the connecting portion 130 and the outer side surface of the fixed wall 120 are arranged at an obtuse angle. Compared with the connecting portion 130 and the fixed wall 120 being arranged at a right angle, or the outer side surface of the connecting portion 130 and the outer side surface of the fixed wall 120 being arranged at an acute angle, the connecting portion 130 and the fixed wall 120 can be effectively prevented from being broken, the structural strength can be improved, and thus the service life of the moving knife 100 can be ensured.

[0231] In order to ensure the structural strength, the arc-shaped shear portion 110, the connecting portion 130 and the two fixed walls 120 are optionally integrally formed. In actual production, the fixed wall 120 of the moving knife 100 with a U-shaped cross section can be offset inwardly with respect to the arc-shaped shear portion 110 to be naturally bent to form the connecting portion 130.

[0232] In the present application, the outer side surface of the connecting portion 130 can be an arc surface, an inclined surface, or a combination of an arc surface and an inclined surface.

[0233] Further, as shown in FIGS. 41-43, the outer side surface of the connecting portion 130 is an arc surface, and the outer side surface of the connecting portion 130 smoothly transitions with the outer side surface of the arc-shaped cutting portion 110 and the outer side surface of the fixed wall 120. In this way, the outer peripheral wall of the arc-shaped cutting portion 110 and the fixed wall 120 are smoothly connected by the arc-shaped connecting portion 130, effectively avoiding breakage of the arc-shaped cutting portion 110, the connecting portion 130, and the fixed wall 120.

[0234] In an embodiment, referring to FIGS. 40-42, the inner side surface of the connecting portion 130 and the inner side surface of the arc-shaped cutting portion 110 are arc-shaped, and enclose the hair-entrapping space 150. In this way, the inner and outer side surfaces of the connecting portion 130 are both arc-shaped with the arc-shaped cutting portion 110, further ensuring the connection strength between the connecting portion 130 and the arc-shaped cutting portion 110 and the fixed wall 120, to ensure the service life of the moving blade 100. The inner side surface of the connecting portion 130 and the inner side surface of the arc-shaped cutting portion 110 enclose the hair-entrapping space 150, so that the inner side surface of the connecting portion 130 can receive part of the hair, to improve the hair cutting effect of the cutting edge of the arc-shaped cutting portion 110 adjacent to the connecting portion 130. In addition, the arc-shaped transition of the inner side surface of the connecting portion 130 and the inner side surface of the arc-shaped cutting portion 110 makes the inner side of the moving blade 100 free of dead angles where hair stubble, dander, and other debris can easily accumulate, thereby making the moving blade 100 easy to clean.

[0235] In an embodiment, as shown in FIGS. 40, 44, and 45, in the bending direction of the arc-shaped cutting portion 110, the two ends of the cutting edge extend to the connecting portion 130. In this way, the length of the cutting edge can be maximized, the effective cutting area of the arc-shaped cutting portion 110 can be increased, and the trimming efficiency of the entire hair trimmer can be improved.

[0236] In an embodiment, referring again to FIGS. 40, 44, and 45, in the bending direction of the arc-shaped cutting portion 110, the width of the cutting edge gradually increases from the middle to the two ends. The width of the two ends of the cutting edge in the bending direction is set to be larger, to improve the connection strength with the fixed wall 120 and avoid breakage. The width of the middle of the cutting edge in the bending direction is set to be smaller, so that the cutting edge can better fit the moving blade 100, thereby improving the cutting effect of the cutting head 10.

[0237] In an embodiment, the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in the bending direction is greater than or equal to 0.6 and less than or equal to 0.9. Specifically, the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in the bending direction can be 0.6, 0.65, 0.7, 0.78, 0.8, 0.85, 0.88, 0.9.

[0238] When the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in the bending direction is less than 0.6, the distance between the two fixed walls 120 is too large compared to the inner bending distance of the arc-shaped shearing part 110, the size of the entire arc-shaped shearing part 110 in the bending direction is too large, and the arc-shaped shearing part 110 is prone to shaking relative to the fixed walls 120, thereby affecting the cutting effect. When the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in the bending direction is greater than 0.9, the distance between the two fixed walls 120 is too small compared to the inner bending distance of the arc-shaped shearing part 110, and the effective shearing area of the moving cutter 100 is not significantly increased. By making the ratio of the distance between the two fixed walls 120 to the maximum width of the arc-shaped shearing part 110 in the bending direction greater than or equal to 0.6 and less than or equal to 0.9, the effective shearing area of the moving cutter 100 can be significantly increased while ensuring the stability of the entire moving cutter 100, thereby comprehensively improving the shearing efficiency of the hair clipper.

[0239] The present application also provides a cutter head device, as shown in FIGS. 43-45 and 48, which is a cutter head 10 of a hair clipper. The cutter head 10 of the hair clipper includes a static cutter 200, a moving cutter seat 300, and a moving cutter 100 of the hair clipper. The static cutter 200 covers the periphery of the arc-shaped shearing part 110 of the moving cutter 100 to cooperate with the arc-shaped shearing part 110 to shear hair. The two fixed walls 120 of the moving cutter 100 are fixedly connected to the moving cutter seat 300. The specific structure of the moving cutter 100 of the hair clipper is referred to the above embodiments. Since the cutter head 10 of the hair clipper adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0240] The cross section of the static cutter 200 is U-shaped, and the arc-shaped shearing part 110 of the moving cutter 100 is attached to the arc-shaped inner surface of the static cutter 200 to enable the moving cutter 100 to move relative to the static cutter 200 to shear hair. The specific structure of the moving cutter seat 300 can be various, as long as it can fix the fixed walls 120 and the output shaft of the moving cutter 100, which will not be limited here. The fixed walls 120 and the moving cutter seat 300 can be fixedly connected by welding.

[0241] The application also provides a hair trimmer, as shown in FIG. 46 and FIG. 47, which comprises a main body 20 and at least one hair trimmer cutter head 10. The main body 20 has an output shaft connected with the moving cutter 100 of the hair trimmer cutter head 10 to drive the moving cutter 100 to reciprocate relative to the fixed cutter 200 along a preset direction. The specific structure of the hair trimmer cutter head 10 is described above. Since the hair trimmer adopts all the technical solutions of the above-mentioned embodiments, it has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0242] The hair trimmer can comprise one or more cutter heads 10 described above. The main body 20 is provided with a driving mechanism, and the output shaft of the driving mechanism is connected with the moving cutter 100 to drive the moving cutter 100 to reciprocate relative to the fixed cutter 200 along a preset direction to realize cutting hair. The specific structure of the main body 20 and the driving mechanism can have many forms, which will not be limited here.

[0243] The reciprocating cutter head of the hair trimmer is usually used to fit the skin and trim hair, which comprises a moving cutter and a fixed cutter. The moving cutter reciprocates relative to the fixed cutter to shear hair. However, in the prior art, if the shearing stroke of the moving cutter is not appropriate, the shearing efficiency will be unsatisfactory. For example, if the stroke is too small, the number of meshes participating in shearing is small, resulting in low shearing efficiency. If the stroke is too large, the number of meshes participating in shearing increases, but the friction area increases, which easily leads to noise problems, and the acceleration of the moving cutter is small, resulting in poor shearing effect and low shearing efficiency.

[0244] The above content is only used to assist in understanding the technical solutions of the application and does not mean that the above content is prior art.

[0245] In order to solve the above-mentioned problems, please refer to FIG. 49 to FIG. 56, the sixth scheme of the application provides a cutter head device.

[0246] In the embodiment of the application, please refer to FIG. 49 to FIG. 55, the cutter head device is a reciprocating cutter head 100 of a hair trimmer, which comprises a fixed cutter mesh 110 and a moving cutter assembly 120. The fixed cutter mesh 110 covers the moving cutter assembly 120, and the moving cutter assembly 120 reciprocates relative to the fixed cutter mesh 110 along a preset direction within a shearing stroke. The fixed cutter mesh 110 is provided with a plurality of mesh holes 111 distributed at intervals along the preset direction. The shearing stroke is greater than or equal to the maximum distance of two adjacent mesh holes 111 in the preset direction and less than or equal to the maximum distance of four adjacent mesh holes 111 in the preset direction.

[0247] In the present embodiment, the static blade net 110 can be arc-shaped or flat. The static blade net 110 comprises a plurality of mesh holes 111 arranged in a grid shape. The shape of the mesh holes 111 can be circular, oval, track-shaped or polygonal, etc. The shape of the mesh holes 111 in the static blade net 110 can be one or more, which is not limited herein. The moving blade assembly 120 is driven by a driving assembly and reciprocates within a shearing stroke. When the moving blade assembly 120 reciprocates, at least two mesh holes 111 and at most four mesh holes 111 are involved in a single shearing stroke. In other words, the preset direction of the reciprocation has a forward direction and a reverse direction. When the moving blade assembly 120 moves in the forward direction, at least two mesh holes 111 and at most four mesh holes 111 are passed through. The same applies when the moving blade assembly 120 moves in the reverse direction.

[0248] The shearing stroke can be the maximum distance of 2, 2.5, 3, 3.5 or 4 adjacent mesh holes 111 in the preset direction. The maximum distance of two adjacent mesh holes 111 in the preset direction refers to the distance between the starting point of one mesh hole 111 and the starting point of the adjacent mesh hole 111. If the static blade net 110 comprises only one type of mesh hole 111, and the length of each mesh hole 111 in the preset direction is B, and the interval between adjacent mesh holes 111 in the preset direction is A, then the maximum distance of two adjacent mesh holes 111 in the preset direction is A+2B, and the maximum distance of four adjacent mesh holes 111 is 4B+3A. If the static blade net 110 comprises a plurality of types of mesh holes 111, then the maximum distance of two adjacent mesh holes 111 is the sum of A and the width of any two adjacent mesh holes 111 in the preset direction, and the maximum distance of four adjacent mesh holes 111 in the preset direction is the sum of A and the width of any four adjacent mesh holes 111 in the preset direction. Experiments show that under such a stroke, the moving blade assembly 120 can maintain a high reciprocating speed and has a high shearing efficiency.

[0249] The reciprocating cutter head 100 of the hair trimmer of the present application ensures that at least two mesh holes 111 and at most four mesh holes 111 are involved in each reciprocation of the moving blade by setting the shearing stroke to be greater than or equal to the maximum distance of two adjacent mesh holes 111 in the preset direction and less than or equal to the maximum distance of four adjacent mesh holes 111 in the preset direction. Compared with the case of too small stroke, more mesh holes 111 involved in shearing significantly improves the shearing efficiency. Compared with the case of too large stroke, since the stroke is controlled within the range of four mesh holes 111, the friction area is effectively controlled, ensuring the optimal shearing stroke. Since the shearing efficiency is affected by various factors such as friction, shearing speed and air resistance, when the stroke increases to a certain extent, the effect of increasing the stroke on improving the shearing efficiency decreases.

[0250] Secondly, the moving knife assembly 120 of the reciprocating knife head generally moves at a slow speed at the start and end positions of the stroke and at a maximum speed at the middle position. By controlling the stroke within two to four mesh holes 111, the moving knife assembly 120 needs to reach the maximum speed in a shorter time, that is, the acceleration of the moving knife assembly 120 is larger, so that the overall shearing speed is faster and the shearing effect is better, thereby improving the shearing efficiency of the whole machine.

[0251] In an embodiment, the shearing stroke is greater than or equal to 1.7 mm and less than or equal to 2.5 mm. That is, the maximum distance between two adjacent mesh holes 111 in the preset direction is 1.7 mm, and the maximum distance between four adjacent mesh holes 111 in the preset direction is 2.5 mm. Within the shearing stroke range of 1.7 mm to 2.5 mm, the moving knife assembly 120 can complete effective shearing within the optimal stroke, so that the moving knife can trim the hair more accurately in each reciprocating motion, which is suitable for trimming shorter hair. Secondly, compared with a too long shearing stroke, when the maximum speed of the moving knife assembly 120 is constant, the shearing stroke of the present embodiment can make the moving knife assembly 120 reach the maximum speed in a shorter time, thereby improving the shearing effect.

[0252] In an embodiment, referring to FIGS. 51 to 53, the moving knife assembly 120 includes a plurality of shearing edges 121 distributed at intervals along the preset direction, and the shearing edges 121 reciprocate along the preset direction relative to the static knife mesh 110 within the shearing stroke; the interval between two adjacent mesh holes 111 in the preset direction is A, and the shearing stroke of the shearing edge 121 is greater than or equal to the sum of A and the width of any two adjacent mesh holes 111 in the preset direction, and less than or equal to 3A and the sum of the width of any four adjacent mesh holes 111 in the preset direction.

[0253] In the present embodiment, the mesh holes 111 in the static knife mesh 110 can be one or more shapes. When the mesh holes 111 of the static knife mesh 110 are one shape, the width of each mesh hole 111 in the preset direction is the same. When the mesh holes 111 of the static knife mesh 110 are multiple shapes, the width of each mesh hole 111 in the preset direction can be the same or different, which is not limited herein.

[0254] The shearing edges 121 are spaced apart along the preset direction, and the shearing stroke of each shearing edge 121 is controlled to be greater than or equal to the sum of the widths of any two adjacent mesh holes 111 in the preset direction and less than or equal to the sum of the widths of any four adjacent mesh holes 111 in the preset direction, ensuring that the moving knife assembly 120 passes through more mesh hole 111 areas in each shearing stroke, so that the moving knife assembly 120 can shear more hair areas, thereby improving the shearing efficiency. Secondly, the moving knife assembly 120 includes a plurality of shearing edges 121, so that the hair in each mesh hole 111 can be passed through by multiple shearing edges 121 in a single shearing stroke, so that the hair in each mesh hole 111 is trimmed more cleanly and quickly, effectively improving the shearing efficiency.

[0255] In an embodiment, a shearing gap 122 is formed between two adjacent shearing edges 121, and the width of the shearing gap 122 is greater than the sum of the width of a mesh hole 111 in the preset direction and the interval between adjacent two mesh holes 111. The larger shearing gap 122 helps to reduce the accumulation of hair between the shearing edges 121, thereby reducing the risk of clogging and entanglement, ensuring smooth movement of the shearing edges 121, thereby improving the shearing efficiency.

[0256] In an embodiment, referring to FIG. 54, the shearing edge 121 is arc-shaped, and the width of the shearing edge 121 gradually increases from the middle part to the two ends in the bending direction, so that the width of the shearing gap 122 gradually decreases from the middle part to the two ends in the bending direction.

[0257] In the present embodiment, the extension shape of the cross section of the shearing edge 121 is arc-shaped. The central angle corresponding to the cross section of the shearing edge 121 can be less than 180 degrees, or equal to or greater than 180 degrees, as long as the cross section of the shearing edge 121 is arc-shaped, which is not limited herein. The middle part of the shearing edge 121 is the main shearing part of the hair trimmer 200, and the width of the middle part is small, so that a larger shearing gap 122 is formed between adjacent two shearing edges 121, thereby reducing the accumulation and clogging between the shearing edges 121, thereby improving the shearing efficiency of the hair trimmer 200. The two ends of the shearing edge 121 in the bending direction are used to connect other components, and the width at this position is large, so as to increase the connection area of the shearing edge 121 and other components, thereby enhancing the connection stability of the shearing edge 121 and other components, avoiding the risk of breakage due to the small width of the connection position.

[0258] In one embodiment, referring to Fig. 55, the movable knife assembly 120 further comprises a movable knife base 123 and a movable knife 128 connected with each other, the movable knife 128 comprises a plurality of shearing blades 121 distributed along a preset direction and two installation walls 124 connected to two side ends of the shearing blades 121 in the bending direction respectively, and the outer periphery of each installation wall 124 is recessed from the outer periphery of the shearing blades 121 to form a recessed space 125.

[0259] In the embodiment, the shearing blades 121 have two outermost end points in the bending direction, which refer to two outermost points of the shearing blades 121 in the projection plane in the horizontal direction. Thus, when the central angle of the shearing blades 121 corresponding to the cross section is less than or equal to 180 degrees, the two outermost end points of the shearing blades 121 in the bending direction are the two end points of the shearing blades 121 in the bending direction. When the central angle of the shearing blades 121 corresponding to the cross section is greater than 180 degrees, the two outermost end points of the shearing blades 121 in the bending direction are located outside the two end points of the shearing blades 121 in the bending direction. By connecting the two installation walls 124 to the inner side of the outermost end of the shearing blades 121 in the bending direction, the outer periphery of the installation wall 124 and the outer periphery of the shearing blades 121 form a recessed space 125. Thus, compared with the shearing blades 121 with a U-shaped cross section, the extension length of the shearing blades 121 in the bending direction can be effectively increased without increasing the distance between the two installation walls 124, so that the shearing blades on the shearing blades 121 can be arranged longer to increase the effective shearing area of the shearing blades 121, thereby improving the shearing efficiency of the whole machine.

[0260] In one embodiment, the movable knife 128 further comprises two connecting portions 127, any connecting portion 127 connects an installation wall 124 and a shearing blade 121, the outer periphery of the connecting portion 127 is inclined outward and arranged at an obtuse angle with the installation wall 124, and the inner periphery of the connecting portion 127 and the inner periphery of the shearing blade 121 form a feeding space 126.

[0261] In the embodiment, it can be understood that the surface of the shearing blade 121 is an arc surface, and the surface of the installation wall 124 is generally a plane. If the shearing blade 121 is directly connected with the installation wall 124, the connection part is easy to break. By connecting the installation wall 124 and the shearing blade 121 through the connecting portion 127, the connecting portion 127 is bent relative to the shearing blade 121 and the installation wall 124, so that the outer periphery of the installation wall 124 and the outer periphery of the shearing blade 121 form a recessed space 125, and the direct connection of the installation wall 124 and the shearing blade 121 can be effectively avoided to prevent the connection part from being easy to break.

[0262] The outer circumferential surface of the connecting portion 127 is arranged at an obtuse angle with the outer circumferential surface of the mounting wall 124, which can effectively avoid the fracture of the connecting portion 127 and the mounting wall 124, improve the structural strength, and further ensure the service life of the moving knife assembly 120, compared with the case where the connecting portion 127 is arranged at a right angle with the mounting wall 124 or the outer circumferential surface of the connecting portion 127 is arranged at an acute angle with the outer circumferential surface of the mounting wall 124.

[0263] The inner circumferential surface of the connecting portion 127 and the inner circumferential surface of the shearing blade 121 surround the entry space 126, so that the inner circumferential surface of the connecting portion 127 can receive part of the hair to improve the hair shearing effect of the shearing blade 121 adjacent to the connecting portion 127.

[0264] In an embodiment, the shape of the mesh hole 111 is one of a circle, a racetrack, and a polygon; when the shape of the mesh hole 111 is a polygon, at least one side of the mesh hole 111 is perpendicular to the preset direction.

[0265] In the shearing stroke of the present application, the shape of the mesh hole 111 can be a circle, a racetrack, an ellipse, or a polygon, all of which can achieve good shearing effect. When the shape of the mesh hole 111 is a polygon, it can be a triangle, a quadrilateral, a pentagon, etc., and at least one side of the mesh hole 111 is perpendicular to the preset direction, which ensures the capturing effect of the hair during shearing and reduces the problem of uneven shearing. For example, it can be understood that when at least one side of the polygonal mesh hole 111 is perpendicular to the preset direction, this side forms a parallel or nearly parallel arrangement with the shearing blade 121, so that the hair is more easily grabbed by the edge of the shearing blade 121 and cut off, reducing the possibility of the hair falling off from the mesh hole 111, thereby improving the overall shearing efficiency.

[0266] In an embodiment, the shape of the mesh hole 111 is one of a quadrilateral, a hexagon, and an octagon, and the opposite two sides of the mesh hole 111 are perpendicular to the preset direction.

[0267] In the present embodiment, the opposite two sides of the mesh hole 111 are perpendicular to the preset direction, which enables the moving knife to effectively capture and shear the hair in both directions of reciprocating motion. After the first shearing, part of the hair that is not completely cut off passes through another vertical edge on the return path again, thereby realizing secondary cutting and further improving the shearing efficiency.

[0268] Referring to Fig. 56, the present application also proposes a hair trimmer 200, which comprises a driving assembly and a reciprocating cutter head, the specific structure of which is referred to the above-mentioned embodiments. Since the present hair trimmer 200 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. The output shaft of the driving assembly is connected to the moving cutter assembly 120 of the reciprocating cutter head to drive the moving cutter assembly 120 to reciprocate along a preset direction.

[0269] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not drive the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A tool bit assembly comprising: The cutter head device is a cutter head assembly, the cutter head assembly comprising a cutter seat and a cutter head floatingly mounted on the cutter seat along a first direction; the cutter head comprises a static cutter, a dynamic cutter and a mounting frame, the static cutter is mounted on the mounting frame, and the dynamic cutter is movable relative to the static cutter along a preset direction to realize cutting; One of the mounting frame and the cutter seat is provided with a guide rod extending along the first direction, and the other is provided with a guide hole for inserting and slidingly fitting the guide rod; the guide hole comprises a first guide section, and a width of a cross section of the first guide section in the preset direction is greater than a width in a second direction; The preset direction, the first direction and the second direction intersect with each other.

2. The tool bit assembly of claim 1 wherein, The mounting frame is provided with the guide hole, and the width of the cross section of the first guide section in the preset direction gradually increases in a direction away from the cutter seat.

3. The tool bit assembly of claim 2, wherein, The guide hole further has a second guide section connected to one end of the first guide section close to the cutter seat, and a cross section size of the second guide section is consistent in the first direction.

4. The tool bit assembly of claim 3, wherein, In the first direction, an extension length of the second guide section is less than an extension length of the first guide section.

5. The tool bit assembly of claim 4, wherein, In the first direction, a ratio of the extension length of the first guide section to the extension length of the second guide section is greater than or equal to 2; and / or, a gap between a hole wall of the second guide section and an outer wall of the guide rod is greater than or equal to 0.01 mm and less than or equal to 0.05 mm.

6. The tool bit assembly of claim 1 wherein, A cross section shape of the guide hole is a track shape or an elliptical shape.

7. The tool bit assembly of any one of claims 1 to 6, wherein, The mounting frame comprises a frame and two end covers mounted on both ends of the frame in the preset direction, and the static cutter is mounted on the frame; the end cover is provided with the guide hole, and the cutter seat is provided with the guide rod.

8. The tool bit assembly of claim 7, wherein, The end cover comprises a metal cover and a plastic part arranged in the metal cover; the metal cover is fixedly connected with the frame, and the plastic part is provided with the guide hole.

9. The tool bit assembly of claim 8, wherein, The plastic part is further provided with a clearance cavity communicated with the guide hole, the clearance cavity is arranged on a side of the guide hole away from the cutter seat, and a cross section size of the clearance cavity is greater than a cross section size of the first guide section.

10. The tool bit assembly of claim 1 wherein, The cutter head is provided with a plurality of cutter heads, and the plurality of cutter heads are arranged side by side along the second direction.

11. A hair trimmer characterized by The hair trimmer is a hair cutting device, and the hair cutting device comprises the cutter head assembly.

12. A tool bit assembly comprising: The cutter head device is a trimmer cutter head, and the trimmer cutter head comprises: A cutter head assembly, the cutter head assembly comprising a cutter seat and at least one cutter head floatingly mounted on the cutter seat along an up-down direction, the cutter head comprising a mounting frame; one of the mounting frame and the cutter seat is provided with a guide rod extending along the up-down direction, and the other is provided with a guide hole for slidingly fitting the guide rod; the guide hole has a guide section, and a width of a cross section of the guide section in a first direction is greater than a width in a second direction; the mounting frame has a limiting protrusion protruding in the first direction; the up-down direction, the first direction and the second direction are perpendicular to each other; and The cutter head shell set comprises a shell and a buffer lining fixed to the inner wall of the shell, the buffer lining has a matching part, the limiting protrusions can float up and down below the matching part, and the top surface of the limiting protrusions abuts against the matching part in the floating state.

13. The tool bit assembly of claim 12, wherein, The mounting frame comprises a frame body and two end covers mounted on both ends of the frame body in the first direction, each end cover is provided with the limiting protrusions; the cutter head further comprises a static cutter and a dynamic cutter, the static cutter is fixedly connected to the frame body, the dynamic cutter is arranged on the inner side of the static cutter and can reciprocate along the first direction to realize cutting; the buffer lining is provided with two, and the two buffer linings are fixed to the inner walls of both ends of the shell in the first direction.

14. The tool bit assembly of claim 13, wherein, The cutter head is provided with a plurality of cutter heads arranged side by side in the second direction, and the end covers at both ends of each cutter head are provided with the limiting protrusions; the limiting protrusions at the same end in the first direction are limited and matched with one of the buffer linings.

15. The knife head assembly of claim 14, wherein, The matching part has a first matching surface and a second matching surface, the second matching surface is higher than the first matching surface; the cutter head comprises a middle cutter and side cutters arranged on both sides of the middle cutter in the second direction, the limiting protrusions of the middle cutter are limited and matched with the first matching surface, and the limiting protrusions of the side cutters are limited and matched with the second matching surface.

16. A tool bit assembly as claimed in any one of claims 12 to 15, wherein, The buffer lining further comprises a buffer part, the matching part is arranged on the side wall surface of the buffer part facing the cutter head, and the buffer part forms a floating space below the matching part for the limiting protrusions to float up and down.

17. The tool bit assembly of claim 16, wherein, The side wall surface of the buffer part facing the cutter head is concave to form the floating space together with the matching part.

18. The knife head assembly of claim 16, wherein, The inner wall of the shell is provided with an embedding groove, and the buffer lining is adapted to be embedded in the embedding groove.

19. The tool bit assembly of claim 18, wherein, The side wall of the embedding groove in the first direction is provided with a mounting seat; the buffer lining is provided with a matching groove corresponding to the mounting seat, the mounting seat is adapted to be embedded in the matching groove, and the bottom wall of the mounting seat is exposed to the buffer lining to be fixedly connected with the cutter seat.

20. The tool bit assembly of claim 19, wherein, The cutter seat has a main part and mounting lugs connected to both ends of the main part in the first direction; the cutter head is floatingly mounted on the main part in the up-down direction; the bottom wall of the buffer lining is provided with a mounting groove, the bottom wall of the mounting seat is exposed to the mounting groove; the mounting lugs are embedded in the mounting groove and fixedly connected with the mounting seat.

21. The tool bit assembly of claim 20, wherein, The mounting seat is provided with a mounting hole, the mounting lug is provided with a fixing hole, and the cutter device further comprises a fastener, the fastener is connected with the mounting hole and the fixing hole through the fixing hole to fixedly connect the cutter seat and the cutter head shell set.

22. The knife head assembly of claim 19, wherein, The buffer lining further comprises an extension part connected to the side edges of the buffer part in the second direction, and the matching part and the floating space extend to the outer side edges of the extension part in the second direction.

23. The tool bit assembly of claim 22, wherein, The extension part is arranged at the side end of the buffer part close to the cutter head, and the inner wall surface of the shell is provided with a fixing groove for adaptively mounting the extension part.

24. The tool bit assembly of claim 23, wherein, The buffer lining further comprises fixing lugs arranged on both sides of the matching groove in the second direction; the fixing lugs are respectively arranged at the upper and lower ends of the buffer part; the bottom wall of the shell is provided with limiting grooves matched with the fixing lugs; the fixing lugs are spaced apart from the extension part and sandwich the shell.

25. The tool bit assembly of claim 12 wherein, The shell is made of metal material, and the buffer lining is made of elastic material.

26. The knife head assembly of claim 13, wherein, The end cover is provided with a guide hole, and the width of the cross section of the guide section in the first direction gradually increases from bottom to top. The cutter seat is provided with a guide hole, and the width of the cross section of the guide section in the first direction gradually decreases from bottom to top.

27. A hair trimmer characterized by The hair trimmer is an electric trimmer, and the electric trimmer comprises a main machine and a trimmer head as claimed in any one of claims 12 to 26, wherein the main machine comprises a machine shell and a driving shaft, the trimmer head shell group is connected with the machine shell, and the driving shaft is connected with the trimmer head assembly.

28. A tool bit assembly comprising: The cutter device is a moving cutter assembly, and the moving cutter assembly comprises: a moving cutter comprising a body and a tooth part extending in a first direction, the tooth part being connected to a side edge of the body extending in the first direction; the body is provided with a fixing hole penetrating the body in the thickness direction of the body; a moving cutter seat comprising a seat body, a hot melting protruding part and a connecting part, the hot melting protruding part being arranged on the side of the seat body facing the moving cutter, the hot melting protruding part being inserted into the fixing hole and being hot melt connected with the moving cutter at the fixing hole; the connecting part being arranged on the side of the seat body away from the moving cutter, and the connecting part being used for being connected with a driving device.

29. The knife head assembly of claim 28, wherein, The side of the seat body facing the moving cutter is further provided with a connecting protrusion; the body is provided with a connecting hole penetrating the body in the thickness direction of the body, and the connecting protrusion is inserted into the connecting hole.

30. The knife head assembly of claim 29, wherein, The length of the connecting protrusion in the first direction is greater than the length of the hot melting protruding part in the first direction. And / or, the length of the connecting protrusion in the second direction is greater than the length of the hot melting protruding part in the second direction, and the first direction, the second direction and the thickness direction are arranged perpendicular to each other.

31. The knife head assembly of claim 29, wherein, The body is recessed to form an assembly groove towards the moving cutter seat, the bottom wall of the assembly groove is provided with the fixing hole and the connecting hole, and the end of the hot melting protruding part after hot melting is in the assembly groove.

32. The knife head assembly of claim 31 wherein, The connecting hole extends to the part of the side wall of the assembly groove adjacent to the bottom wall of the assembly groove, and the two ends of the connecting protrusion in the first direction abut against the side wall of the assembly groove and the bottom wall of the assembly groove, respectively.

33. A tool bit assembly as claimed in any of claims 28 to 32 wherein, The moving cutter seat comprises a plurality of hot melting protruding parts; a plurality of hot melting protruding parts are distributed on both sides of the connecting protrusion in the first direction, and the connecting protrusion is arranged corresponding to the position of the connecting part.

34. A tool bit assembly comprising: The cutter head device is a cutter head module, the cutter head module comprises a static cutter, a support and the moving cutter assembly as claimed in any one of claims 28-33, the static cutter is fixedly connected to the support; the moving cutter assembly is located on the side of the static cutter close to the support, and the moving cutter assembly is movably arranged on the support.

35. The knife head assembly of claim 34, wherein, The cutter head device further comprises at least two elastic members; one end of the elastic member abuts against the seat body, and the other end of the elastic member abuts against the support.

36. The tool bit assembly of claim 35, wherein the cutting insert is mounted to the cutting insert pocket by a press fit. The elastic member is a spring, and at least two first spring seats are protruded on the side of the seat body away from the moving cutter; the at least two first spring seats are separately arranged on the two sides of the connecting portion in the first direction. The support is provided with at least two second spring seats on the side of the support facing the seat body; each second spring seat is arranged corresponding to each first spring seat; and the two ends of the spring are respectively sleeved in the first spring seat and the second spring seat.

37. A hair trimmer characterized by The hair trimmer is an electric shaver, and the electric shaver comprises the cutter head module as claimed in any one of claims 34-36.

38. A cutting head device, characterized in that, The cutter head device is a cutter head assembly, the cutter head assembly comprises: a long hair cutter head comprising a fixed cutter in the shape of a long strip flat plate, a plurality of shearing teeth are spaced apart in a second direction on the two sides of the fixed cutter in a first direction, and a shearing groove is formed between adjacent two shearing teeth; and two short hair cutter heads, the two short hair cutter heads are respectively arranged on the opposite two sides of the long hair cutter head and are respectively spaced apart from the long hair cutter head, the end of the shearing tooth and the short hair cutter head form an approach gap extending in the second direction, and the shearing groove and the approach gap are communicated to enable the to-be-cut object to enter the shearing groove through the approach gap; The first direction is the width direction of the fixed cutter, and the second direction is the length direction of the fixed cutter.

39. The knife head assembly of claim 38, wherein, The long hair cutter head further comprises a fixed cutter support, the fixed cutter support is fixedly connected to the bottom side of the fixed cutter, and the side plate of the fixed cutter support facing the short hair cutter head is located on the side of the bottom wall of the shearing groove away from the short hair cutter head, and the side plate of the fixed cutter support facing the short hair cutter head also forms the approach gap with the short hair cutter head.

40. The tool bit assembly of any one of claims 38-39, wherein, The bottom wall of the shearing groove comprises two circular arc surfaces and a connecting surface connected between the two circular arc surfaces, and the two circular arc surfaces are respectively connected with the two side walls of the shearing groove opposite to each other.

41. The tool bit assembly of any one of claims 38 to 39, wherein, The width of the shearing groove gradually increases from inside to outside in the third direction; and the third direction is the thickness direction of the fixed cutter.

42. The knife head assembly of claim 41 wherein, The opposite two side walls of the shearing groove are at least partially inclined away from each other from inside to outside in the third direction.

43. The knife head assembly of claim 42, wherein, The side wall of the shearing groove has a first section connected with the bottom wall of the shearing groove and a second section connected on the side away from the bottom wall of the first section, and the first section is inclined away from each other from inside to outside in the third direction, so that the second section is convex relative to the first section.

44. The knife head assembly of claim 41 wherein, The inner edges of the opposite two side walls of the shearing groove in the third direction respectively form shearing edges matched with the moving cutter for shearing, and the two shearing edges are arranged in parallel.

45. The tool bit assembly of any of claims 38-39, wherein, The top wall of the shearing tooth smoothly transitions from the root to the end and is downwardly inclined.

46. The tool bit assembly of any of claims 38-39, wherein, The short cutter head comprises a fixed cutter net arranged side by side with the fixed cutter, and the top of the fixed cutter net is in a circular arc shape, and the highest point of the fixed cutter net is higher than or flush with the highest point of the fixed cutter.

47. A hair trimmer characterized by The cutter head assembly comprises a cutter head and a driving device, and the output shaft of the driving device is connected to the cutter head.

48. A tool bit assembly comprising: The cutter head device is a moving cutter of a hair trimmer, and the moving cutter of the hair trimmer comprises an arc-shaped shearing part and two fixed walls; The arc-shaped shearing part comprises a plurality of shearing edges arranged at intervals in a preset direction; The two fixed walls are connected to the two side ends of the arc-shaped shearing part in the bending direction of the arc-shaped shearing part and are located inward of the outermost ends of the arc-shaped shearing part, so that the outer side surface of each fixed wall and the outer side surface of the arc-shaped shearing part form a recessed space at the connection position.

49. The knife head assembly of claim 48, wherein, The two fixed walls are connected to the arc-shaped shearing part through a connecting part, the connecting part is arranged at an angle with respect to the first direction and the second direction, and the outer side surface of the connecting part is inclined outward, and the two fixed walls are arranged at intervals in the first direction, and the first direction, the second direction and the preset direction are perpendicular to each other.

50. The tool bit assembly of claim 49, wherein, The outer side surface of the connecting part is an arc surface, and the outer side surface of the connecting part is smoothly connected to the outer side surface of the arc-shaped shearing part and the outer side surface of the fixed wall.

51. The knife head assembly of claim 49, wherein, The inner side surface of the connecting part and the inner side surface of the arc-shaped shearing part are arc-shaped and smoothly connected.

52. The knife head assembly of claim 48, wherein, The outer side surface of the arc-shaped shearing part and the outer side surface of the fixed wall are arc-shaped and smoothly connected.

53. The knife head assembly of claim 49, wherein, The arc-shaped shearing part, the connecting part and the two fixed walls are integrally formed.

54. The knife head assembly of claim 49, wherein, In the bending direction of the arc-shaped shearing part, the two ends of the shearing edge extend to the connecting part.

55. The knife head assembly of claim 48, wherein, In the bending direction of the arc-shaped shearing part, the width of the shearing edge gradually increases from the middle to the two ends.

56. The tool bit assembly of any one of claims 48 to 55, wherein, The ratio of the distance between the two fixed walls to the maximum width of the arc-shaped shearing part in the bending direction thereof is greater than or equal to 0.6 and less than or equal to 0.

9.

57. A tool bit assembly comprising: The cutter head device is a cutter head of a hair trimmer, and the cutter head of the hair trimmer comprises a fixed cutter, a moving cutter seat and a moving cutter of the hair trimmer according to any one of claims 48 to 56, the fixed cutter covers the periphery of the arc-shaped shearing part of the moving cutter to cooperate with the arc-shaped shearing part to shear hair, and the two fixed walls of the moving cutter are fixedly connected to the moving cutter seat.

58. A hair trimmer characterized by The cutter head device is a reciprocating cutter head of a hair trimmer, and the reciprocating cutter head of the hair trimmer comprises a fixed cutter net and a moving cutter assembly.

59. A tool bit assembly comprising: The fixed cutter net covers the moving cutter assembly, and the moving cutter assembly reciprocates relative to the fixed cutter net along a preset direction within a shearing stroke. The fixed cutter net is provided with a plurality of mesh holes arranged at intervals in the preset direction. The shearing stroke is greater than or equal to the maximum distance between two adjacent mesh holes in the preset direction and less than or equal to the maximum distance between four adjacent mesh holes in the preset direction. ​ 60. The knife head assembly of claim 59, wherein, The shearing stroke is greater than or equal to 1.7 mm and less than or equal to 2.5 mm.

61. The knife head assembly of claim 60, wherein, The moving cutter assembly comprises a plurality of shearing blades spaced apart along the preset direction, and the shearing blades reciprocate along the preset direction relative to the static cutter screen within the shearing stroke. The interval between two adjacent screen holes in the preset direction is A, the shearing stroke of the shearing blade is greater than or equal to the sum of A and the width of any two adjacent screen holes in the preset direction, and less than or equal to 3A and the sum of the width of any four adjacent screen holes in the preset direction.

62. The knife head assembly of claim 61, wherein, A shearing gap is formed between two adjacent shearing blades, and the width of the shearing gap is greater than the sum of the width of one screen hole in the preset direction and the interval between two adjacent screen holes.

63. The knife head assembly of claim 62, wherein, The shearing blade is arc-shaped, and the width of the shearing blade gradually increases from the middle part to both ends in the bending direction, so that the width of the shearing gap gradually decreases from the middle part to both ends in the bending direction.

64. The knife head assembly of claim 63, wherein, The moving cutter assembly further comprises a moving cutter seat and a moving cutter connected to each other, the moving cutter comprises a plurality of shearing blades spaced apart along the preset direction and two mounting walls, the two mounting walls are respectively connected to both side ends of the two shearing blades in the bending direction, and are recessed relative to the outermost end of the shearing blade, so that a recessed space is formed at the connection between the outer peripheral surface of each mounting wall and the outer peripheral surface of the shearing blade.

65. The knife head assembly of claim 64, wherein, The moving cutter further comprises two connecting portions, any connecting portion connects a mounting wall and a shearing blade, the outer peripheral surface of the connecting portion is inclined outward and is arranged at an obtuse angle with the outer peripheral surface of the mounting wall, and the inner peripheral surface of the connecting portion and the inner peripheral surface of the shearing blade form an inlet space.

66. A tool bit assembly as claimed in any of claims 59 to 65 wherein, The shape of the screen hole is one of a circle, a racetrack and a polygon. When the shape of the screen hole is a polygon, at least one side of the screen hole is perpendicular to the preset direction.

67. The knife head assembly of claim 66, wherein, The shape of the screen hole is one of a quadrilateral, a hexagon and an octagon, and opposite sides of the screen hole are perpendicular to the preset direction.

68. A hair trimmer characterized by A reciprocating cutter head comprising a driving assembly and a hair trimmer according to any one of claims 59 to 67, and the output shaft of the driving assembly is connected to the moving cutter assembly of the reciprocating cutter head.

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