Rotary shaving knife, trimming knife head and trimming tool

Abstract

The rotary type shaving cutter is characterized in that at least one movable cutter tooth is provided with a front angle and a rear angle, and the vertical distance T between the front angle and the rear angle is smaller than the length of a hair guide groove in a static cutter, so that the outer rotating track of the front angle and the inner rotating track of the rear angle are located in the hair guide groove of the static cutter; and when the front angle is close to any hair guide groove in any static cutter, the movable cutting edge and the static cutting edge are inclined to form a first included angle S1. The invention has the beneficial effects that by mutually adjusting the positions of the front angle and the rear angle of the movable cutter teeth, when the front angle of the movable cutter teeth is in contact with the static cutting edge of the static cutter teeth, the front angle of the movable cutter teeth and the static cutting edge form a closed state, and at the moment, part of to-be-sheared beards and other hairs are extruded by the static cutting edge and the static cutting edge; when the trimming tool moves, the trimming tool can slide out of the trimming area of the movable blade and the static blade from the rear corner below and the opening of the static blade, so that the galling phenomenon at the moment of moving of the trimming tool can be prevented, and the use comfort of the trimming tool is improved.

Description

Technical Field

[0001] The invention relates to a hair trimming device, and more particularly to a rotary shaver and a trimming head and a trimming tool, which are mainly used in the field of personal care tools such as shavers and hair trimmers. Background Art

[0002] The existing rotary trimming head is as shown in the instruction manual. Figure 1 As shown, it comprises a circular static knife (1) and a dynamic knife (2), wherein a plurality of static knife teeth (11) arranged at intervals and in a circular array are provided on the static knife (1), and hair guide grooves (12) are formed between adjacent static knife teeth (11), and a plurality of dynamic knife teeth (21) in a circular array are provided on the dynamic knife (2), and each dynamic knife tooth (21) is respectively formed with a front angle (211) and a rear angle (212). In order to facilitate the trimming of hair such as beard, the dynamic blade (211) in the existing dynamic blade tooth (21) is inclined outwardly relative to the static blade (111) in the static blade tooth (11), so that the front angle (212) of the dynamic blade tooth (21) is located below the dynamic blade tooth (21), and the rear angle (213) is located above the dynamic blade tooth (21), and the front angle (212) and the rear angle (213) are connected to form an inclined dynamic blade (211).

[0003] When trimming beards and other hair, the front corner (212) of the moving blade (21) approaches the stationary blade (11) before the rear corner (213), so that an opening is formed between the rear corner (213) and the stationary blade (11), so that the beards and other hair (23) to be trimmed can enter between the moving blade (21) and the stationary blade (11) at any time. Figure 1 As shown in the enlarged figure.

[0004] When the user holds the trimming tool and shaves, the user will frequently move the trimming tool along the skin surface. Due to the fixed static blade (11), when the front angle (212) of the moving blade (21) approaches the static blade (11), the beard and other hair (23) to be trimmed will be driven toward the static blade (1). Part of the beard and other hair (23) to be trimmed cannot move at the moment when the moving blade (211) and the static blade (11) are squeezed, especially cannot move downward due to the restriction of the front angle (212). At this moment, if the user holds the trimming tool and moves upward, the beard and other hair (23) to be trimmed squeezed by the passive blade (21) and the static blade (11) near the front angle (212) will not have space to move downward, which will cause the hair to be pulled, causing the user's skin to feel pulling pain. Figure 2a and Figure 2b As shown in the simulation diagram, the comfort of using the pruning tool is reduced. Summary of the invention

[0005] To solve the above technical problems, the present invention provides a rotary shaver, a trimming cutter head and a trimming tool. By changing the shape of the cutting edges of each moving cutter tooth, when the rake angle of the moving cutting edge approaches the stationary cutting edge, a closed mouth is formed between the moving cutting edge and the stationary cutting edge, preventing hair such as beards from entering the trimming area between the moving cutting edge and the stationary cutting edge during trimming. In this way, when the user holds the trimming tool and moves it upward (or forward) along the skin, no pulling phenomenon will occur regardless of the moving speed, improving the comfort of using the trimming tool.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is a rotary shaver, which includes a blade body, and a plurality of moving cutter teeth for rotary cutting are provided on the blade body; at least one moving cutter tooth has a rake angle and a clearance angle. When the moving cutter tooth rotates along the stationary cutter, the rake angle forms an outer rotation trajectory, and the clearance angle forms an inner rotation trajectory. Among them, the diameter of the outer rotation trajectory of the rake angle is smaller than the inner rotation trajectory of the clearance angle, and the vertical distance T between the rake angle and the clearance angle is less than the length of the hair guide groove in the stationary cutter, so that both the outer rotation trajectory of the rake angle and the inner rotation trajectory of the clearance angle are within the hair guide groove of the stationary cutter; the rake angle and the clearance angle are connected to form an inclined moving cutting edge, and when the rake angle approaches any hair guide groove in the stationary cutter, the moving cutting edge and the stationary cutting edge of the stationary cutter tooth between adjacent hair guide grooves in the stationary cutter form an inclined first included angle S1.

[0007] Preferably, when the rake angle of each moving cutter tooth contacts the stationary cutter tooth, the first included angle S1 between the moving cutting edge and the stationary cutting edge is: 5°≥S2≥30°.

[0008] Preferably, based on the vertical extension line of the rake angle, a second included angle S2 less than 90° is formed between the moving cutting edge and the vertical extension line.

[0009] Preferably, when viewed from the axial orthographic projection of the blade body, when the vertical extension line of the rake angle of any moving cutter tooth coincides with the vertical center line of the blade body, the second included angle S2 between the moving cutting edge in this moving cutter tooth and the vertical center line of the blade body is between 5° and 15°, and the same third included angle S3 is formed between the moving cutting edges of adjacent moving cutter teeth and is arranged at annular intervals.

[0010] Based on the above shaver, the applicant also proposes a technical solution for a trimming cutter head, which includes the above rotary shaver and a stationary cutter cooperating therewith. Among them, the stationary cutter is circular, and several stationary cutter teeth are arranged at intervals in a central radial manner, so that at least two radially spaced trimming rings are formed on the surface of the stationary cutter, and hair guide grooves are respectively formed between adjacent stationary cutter teeth in each trimming ring.

[0011] Preferably, the razor includes an outer cutter and an inner cutter. The outer cutter and the inner cutter have different diameters and are coaxially mounted on the moving cutter holder. Different numbers of moving cutter teeth are formed on the outer cutter and the inner cutter. The trimming ring includes an outer trimming ring and an inner trimming ring. Among them, the outer cutter rotates along the outer trimming ring. When a plurality of moving cutter teeth in the outer cutter rotate close to the static cutting edge of any static cutter tooth in the outer trimming ring, a first included angle S1a is formed between the moving cutting edge in the outer cutter and the static cutting edge in the corresponding static cutter tooth. The inner cutter rotates along the inner trimming ring under the drive of an external force. When a plurality of moving cutter teeth in the inner cutter rotate close to the static cutting edge of any static cutter tooth in the inner trimming ring, a first included angle S1b is formed between the moving cutting edge in the inner cutter and the static cutting edge in the corresponding static cutter tooth. Among them, the first included angle S1a and the first included angle S1b are at the same or different angles.

[0012] Preferably, the first included angle S1a and the first included angle S1b are at different angles, and the first included angle S1a is less than the first included angle S1b, where the first included angle S1b is 10° - 30°.

[0013] Preferably, when viewed from the orthographic projection direction of the central axis of the inner cutter, the rake angle and the clearance angle of each moving cutter tooth in the inner cutter are connected to form an inclined moving cutting edge, and the vertical distance T between the rake angle and the clearance angle is less than the length of the hair guiding groove in the inner trimming ring.

[0014] Preferably, based on the vertical extension line of the rake angle of the inner cutter, the fourth included angle S4 between the moving cutting edge of each moving cutter tooth in the inner cutter and the vertical extension line is 10° - 30°, and the fifth included angle S5 between adjacent moving cutting edges is greater than the fourth included angle S4.

[0015] Based on the above trimming cutter head, the present application also proposes a trimming tool, including the above hair trimming cutter head.

[0016] The beneficial effect of the present invention is to mutually adjust the positions of the rake angle and the clearance angle of the moving cutter teeth, and make the outer rotation trajectory diameter of the rake angle of the moving cutter tooth greater than the inner rotation trajectory of the clearance angle. When the rake angle of the moving cutter tooth contacts the static cutting edge of the static cutter tooth, a closed state is formed between the rake angle of the moving cutter tooth and the static cutting edge. Beards and other hairs to be cut cannot enter the matching trimming area between the moving cutting edge and the static cutting edge. An open state is formed between the clearance angle of the moving cutter tooth and the static cutting edge. At this time, even if some beards and other hairs to be cut are squeezed by the moving cutting edge and the static cutting edge, and the user happens to move the handheld tool along the skin surface, the squeezed beards and other hairs to be cut can slide out of the trimming area between the moving cutting edge and the static cutting edge from the opening between the clearance angle below and the static cutting edge, thereby preventing the phenomenon of pulling hair during the moment of moving the trimming tool and improving the use comfort of the trimming tool. Description of the Drawings

[0017] Figure 1 It is an assembly structure diagram of an existing hair trimming cutter head

[0018] Figure 2a The first simulation diagram of the existing moving blade and stationary blade cooperating to trim beards and other hairs

[0019] Figure 2b The second simulation diagram of the existing moving blade and stationary blade cooperating to trim beards and other hairs

[0020] Figure 3 The front view structural diagram of the first embodiment of the rotary hair clipper according to the embodiment of the present invention

[0021] Figure 4 The three-dimensional structural diagram of the first embodiment of the rotary hair clipper according to the embodiment of the present invention

[0022] Figure 5 The assembly structural diagram of the first embodiment of the rotary hair clipper according to the embodiment of the present invention

[0023] Figure 6 The front view structural diagram of the second embodiment of the rotary hair clipper according to the embodiment of the present invention

[0024] Figure 7 The three-dimensional structural diagram of the second embodiment of the rotary hair clipper according to the embodiment of the present invention

[0025] Figure 8 The assembly structural diagram of the second embodiment of the rotary hair clipper according to the embodiment of the present invention

[0026] Figure 9 The three-dimensional exploded view of the trimming cutter head according to the embodiment of the present invention Detailed implementation manners

[0027] The following further describes the embodiments of the present invention in conjunction with the attached Figures 3 to 9 drawings:

[0028] The present invention discloses a rotary shaver, which includes a blade body 3. A plurality of moving cutter teeth 4 for rotary cutting are provided on the blade body 3, and the moving cutter teeth 4 are arranged in a circular array at intervals. In order to solve the problem that the moving cutter edge 41 in the existing moving cutter teeth 4 forms an open state with the static cutter edge 511 during the process of trimming beards and other hairs, resulting in the beards and other hairs still being able to enter the trimming area between the moving cutter edge 41 and the static cutter edge 511 during trimming. When the user holds the trimming tool and slides it along the skin, a pulling phenomenon occurs, causing the user's skin to have a pulling pain and reducing the use comfort of the trimming tool. To solve the above technical defects, the following technical solutions are provided in this embodiment: At least one moving cutter tooth 4 has a front angle 42 and a rear angle 43. When the moving cutter tooth 4 rotates along the static cutter 5, the front angle 42 forms an outer rotation trajectory 421, and the rear angle 43 forms an inner rotation trajectory 431. Among them, the diameter of the outer rotation trajectory 421 of the front angle 42 is smaller than the inner rotation trajectory 431 of the rear angle 43, and the vertical distance T between the front angle 42 and the rear angle 43 is smaller than the length of the hair guide groove 52 in the static cutter 5, so that both the outer rotation trajectory 421 of the front angle 42 and the inner rotation trajectory 431 of the rear angle 43 are within the hair guide groove 52 of the static cutter 5; By mutually adjusting the positions of the front angle 42 and the rear angle 43 of the moving cutter tooth 4, and making the diameter of the outer rotation trajectory 421 of the front angle 42 of the moving cutter tooth 4 larger than the inner rotation trajectory 431 of the rear angle 43; When the front angle 42 of the moving cutter tooth 4 contacts the static cutter edge 511 of the static cutter tooth 51, a closed state is formed between the front angle 42 of the moving cutter tooth 4 and the static cutter edge 511, and the beards and other hairs to be trimmed cannot enter the cooperative trimming area between the moving cutter edge 41 and the static cutter edge 511, while an open state is formed between the rear angle 43 of the moving cutter tooth 4 and the static cutter edge 511. At this time, even if some of the beards and other hairs to be trimmed are squeezed by the moving cutter edge 41 and the static cutter edge 511, and the user happens to move the hand-held tool along the skin surface, the squeezed beards and other hairs to be trimmed can also slide out of the trimming area between the moving cutter edge 41 and the static cutter edge 511 from the opening between the rear angle 43 and the static cutter edge 511 below, thereby preventing the pulling phenomenon from occurring at the moment when the trimming tool moves and improving the use comfort of the trimming tool.

[0029] In addition, the vertical distance T between the rake angle 42 and the flank angle 43 of the moving cutter teeth 4 is set to be less than the length of the hair guiding groove 52. In this way, while ensuring the hair trimming performance of each moving cutter tooth 4, the contact area between the moving cutter teeth 4 and the stationary cutter 5 is reduced. With the reduction of the contact area, when each moving cutter tooth 4 of the moving cutter rotates along the stationary cutter 5, the frictional resistance between each moving cutter tooth 4 and the stationary cutter 5 will also be synchronously reduced, thereby avoiding the increase in heat caused by friction between the moving cutter teeth 4 and the stationary cutter 5, reducing the frictional temperature rise between the moving cutter teeth 4 and the stationary cutter 5, preventing the user's skin from having a burning sensation due to excessive temperature rise, and improving the comfort of using the trimming tool. Secondly, the vertical distance T between the rake angle 42 and the flank angle 43 of the moving cutter teeth 4 is set to be less than the hair guiding groove 52. In this way, when hairs such as beards to be trimmed enter the hair guiding groove 52, the hairs such as beards that are not cut by the cutting edge 41 of the moving cutter have sufficient sliding space, avoiding the phenomenon of pulling or jamming hairs due to insufficient space and ensuring the comfort of using the razor.

[0030] To improve the cutting sharpness between the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter, the rake angle 42 and the flank angle 43 are connected to form an inclined cutting edge 41 of the moving cutter. When the rake angle 42 approaches any one of the hair guiding grooves 52 in the stationary cutter 5, a first included angle S1 is formed between the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter teeth 51 adjacent to the hair guiding groove 52 in the stationary cutter 5 in an inclined shape. The cutting edge 41 of the moving cutter is set to be inclined, and a first inclined included angle S1 is formed between the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter. In this way, when the moving cutter rotates along the stationary cutter 5, the cutting angle between the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter is correspondingly adjusted, making the cutting sharpness between the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter higher and the trimming performance of the razor better.

[0031] To improve the hair trimming performance and cutting efficiency between the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter, when each moving cutter tooth 4 contacts the stationary cutter tooth 5 at its rake angle 42, the first included angle S1 between the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter is: 5°≥S1≥30°, preferably less than 15°. In this way, while ensuring the cutting sharpness, the working intensities of the cutting edge 41 of the moving cutter and the cutting edge 511 of the stationary cutter can be taken into account.

[0032] In order to facilitate the production of the static knife 5 and ensure the hair feeding efficiency of the static knife 5, the static knife teeth 51 in the existing static knife 5 are basically radial from the center. Due to the limitation that the shape and angle of the static knife teeth 51 are fixed, the angle of the dynamic blade 41 can only be changed to adjust the cutting angle between the dynamic blade 41 and the static blade 511. Therefore, based on the vertical extension line of the front angle 42, a second angle S2 less than 90° is formed between the dynamic blade 41 and the vertical extension line, which is equivalent to tilting the dynamic blade 41 to the left side below (i.e., the side away from the rotation direction). By controlling the inclination angle of the second angle S2, the first angle S1 between the dynamic blade 41 and the static blade 511 can be adjusted. With the dynamic blade 41 of this structure, the cutting sharpness between the dynamic blade 41 and the static blade 511 can be ensured while taking into account the production and hair feeding efficiency of the static knife 5, thereby improving the hair trimming performance of the dynamic blade 41 and the static blade 511.

[0033] In actual production, in order to facilitate the measurement of the second angle S2, when the vertical extension line of the front angle 42 overlaps with the central axis of the moving knife, the angle between the moving blade 41 and the central axis is the second angle S2, which is preferably 5° to 15°. Figure 3 By adjusting the second angle S2 between the moving blade 41 and the vertical extension line of the front corner 42, the limitation that the angle of the stationary blade 51 is fixed and difficult to adjust can be avoided, so that the cutting angle between the moving blade 41 and the stationary blade 511 can be adjusted according to needs or user requirements, thereby ensuring the cutting sharpness between the moving blade 41 and the stationary blade 511 and improving the hair trimming performance of the trimming tool.

[0034] In order to facilitate the forming of each moving blade tooth 4 in the moving blade, a third angle S3 is formed between the moving blades 41 in adjacent moving blade teeth 4, so that each moving blade tooth 4 is in a ring-shaped spaced array. The angle of the third angle S3 is preferably an integer divisor of the circumference, and the specific value is determined according to the number of moving blade teeth 4. If the number of moving blade teeth 4 is set to 12, the angle value of the third angle S3 is 30°, and if the number of moving blade teeth 4 is 9, the corresponding angle value of the third angle S3 is 40°. Therefore, the specific value of the third angle S3 depends on the specific number of moving blade teeth 4, and this embodiment does not make any further restrictions.

[0035] Based on the above-mentioned razor, in this embodiment, a technical solution for a trimming cutter head is further proposed, including the above-mentioned rotary razor and a stationary blade 5 that cooperates with it. Among them, the stationary blade 5 is circular, and several stationary blade teeth 51 are arranged at intervals in a central radial pattern, so that at least two radially spaced trimming rings 53 are formed on the surface of the stationary blade 5, and guide hair grooves 52 are respectively formed between adjacent stationary blade teeth 51 in each trimming ring 53. By arranging two radially spaced trimming rings 53 on the surface of the stationary blade 5, the length of the guide hair groove 52 between adjacent stationary blade teeth 51 can be relatively shortened, preventing the stationary blade teeth 51 from bending and deforming when the stationary blade 5 contacts the skin, increasing the frictional resistance between the moving blade and the stationary blade 5, and affecting the hair trimming performance of the cooperation between the stationary blade teeth 51 and the moving blade teeth 4. Secondly, it can also effectively improve the overall surface strength of the stationary blade 5 and ensure the hair feeding efficiency of the stationary blade 5.

[0036] Since two radially spaced trimming rings 53 are provided in the stationary blade 5, the guide hair grooves 52 in the two trimming rings 53 can separately guide the beards and other hairs to be trimmed during use. To ensure the hair trimming efficiency of each trimming ring 53, the razor includes an outer cutting blade 3a and an inner cutting blade 3b. The outer cutting blade 3a and the inner cutting blade 3b have different diameters and are coaxially installed on the moving blade seat 6, and different numbers of moving blade teeth 4 are formed on the outer cutting blade 3a and the inner cutting blade 3b; the trimming ring 53 includes an outer trimming ring 531 and an inner trimming ring 532. Among them, the outer cutting blade 3a rotates along the outer trimming ring 531, and when a plurality of moving blade teeth 4 in the outer cutting blade 3a rotate close to the stationary blade edge 511 of any stationary blade tooth 51 in the outer trimming ring 531, a first included angle S1a is formed between the moving blade edge 41 in the outer cutting blade 3a and the stationary blade edge 511 in the corresponding stationary blade tooth 51; the inner cutting blade 3b rotates along the inner trimming ring 532 under the drive of an external force, and when a plurality of moving blade teeth 4 in the inner cutting blade 3b rotate close to the stationary blade edge 511 of any stationary blade tooth 51 in the inner trimming ring 532, a first included angle S1b is formed between the moving blade edge 41 in the inner cutting blade 3b and the stationary blade edge 511 in the corresponding stationary blade tooth 51. Among them, the first included angle S1a and the first included angle S1b are at the same or different angles. By forming the outer trimming ring 531 and the inner trimming ring 532 in the stationary blade 5, in order to cooperate with the hair trimming efficiency of the outer trimming ring 531 and the inner trimming ring 532, two corresponding razors are provided, which rotate along the outer trimming ring 531 and the inner trimming ring 532 respectively. This not only shortens the length of the guide hair groove 52 between adjacent stationary blade teeth 51 in the stationary blade 5 and improves the working strength of the stationary blade 5; at the same time, it can also shorten the length of the moving blade teeth 4 accordingly. The moving blade teeth 4 in the two independent outer cutting blade 3a and inner cutting blade 3b cooperate with the outer trimming ring 531 and the inner trimming ring 532, avoiding the distortion and deformation of the moving blade teeth 4 in the outer cutting blade 3a and the inner cutting blade 3b due to excessive length, and ensuring the hair trimming performance of the trimming cutter head.

[0037] Since the outer cutting knife 3a and the inner cutting knife 3b have different diameters and are coaxially installed on the moving knife holder 6, in actual production, the number of moving knife teeth 4 on the outer cutting knife 3a and the inner cutting knife 3b can be the same or different. For example, if the number of moving knife teeth 4 on the outer cutting knife 3a and the inner cutting knife 3b is the same, it means that the interval between the moving knife teeth 4 on the inner cutting knife 3b is relatively smaller than that on the outer cutting knife 3a, which may affect the hair feeding efficiency of each guide hair groove 52 in the inner trimming ring 532. Therefore, in this embodiment, the number of moving knife teeth 4 on the outer cutting knife 3a and the inner cutting knife 3b is different, that is, the number of moving knife teeth 4 on the inner cutting knife 3b is less than that on the outer cutting knife 3a.

[0038] In the case where the number of moving knife teeth 4 is different, the angle values of the first angle S1a formed between the moving blade edge 41 of the moving knife teeth 4 on the outer cutting knife 3a and the static blade edge 511 and the first angle S1b formed between the moving blade edge 41 of each moving knife tooth 4 in the inner cutting knife 3b and the static blade edge 511 can be set to be the same, but can also be set to be different. For example, if they are set to the same angle, during assembly, the moving knife teeth 4 on the outer cutting knife 3a and the inner cutting knife 3b need to be staggeredly arranged to avoid mutual interference when trimming beards and other hairs. Of course, the first angle S1a and the first angle S1b can also be set to different angles. For example, the first angle S1a is less than the first angle S1b, where the first angle S1b is 10° - 30°, preferably 15°, and the first angle S1a is preferably 5°. With such different angle settings, when the moving knife teeth 4 on the outer cutting knife 3a and the inner cutting knife 3b cut off beards and other hairs simultaneously, the falling directions of the broken beards or hairs will also be different accordingly, thus avoiding the mutual interference between the outer cutting knife 3a and the inner cutting knife 3b and ensuring the hair trimming efficiency of the trimming cutter head.

[0039] In order to reduce the friction resistance between the inner cutter 3b and the stationary cutter 5, from the direction of the orthographic projection of the central axis of the inner cutter 3b, the front corner 42 and the rear corner 43 of each moving blade 4 in the inner cutter 3b are connected to form an inclined moving blade 41, and the vertical distance T between the front corner 42 and the rear corner 43 is less than the length of each hair guide groove 52 in the inner trimming ring 532; thus, under the condition of ensuring the hair trimming performance of each moving blade 4, the contact area between each moving blade 4 in the inner cutter 3b and the inner trimming ring 532 of the stationary cutter 5 is reduced. With the reduction of the contact area, when each moving blade 4 in the inner cutter 3b rotates along the inner trimming ring 532, the friction resistance between each moving blade 4 of the inner cutter 3b and the stationary cutter 5 will also be reduced synchronously, thereby avoiding the heat increase caused by friction between the moving blade 4 and the stationary cutter 5, reducing the friction temperature rise between the moving blade 4 and the stationary cutter 5, preventing the user's skin from having a burning sensation due to excessive temperature rise, and improving the comfort of using the trimming tool. Secondly, the vertical distance T between the front angle 42 and the rear angle 43 of the movable tooth 4 is set to be smaller than the hair guide groove 52, so that when the beard and other hair to be cut enters the hair guide groove 52, the beard and other hair that have not been cut by the passive blade 41 have sufficient sliding space, avoiding the phenomenon of hair pulling or hair jamming due to insufficient space, thereby ensuring the comfort of using the razor.

[0040] In order to facilitate the production of the static knife 5 and ensure the hair feeding efficiency of the static knife 5, the static knife teeth 51 in the existing static knife 5 are basically radial from the center. Due to the limitation that the shape and angle of the static knife teeth 51 are fixed, in order to adjust the cutting angle between the movable blade 41 and the static blade 511, the angle of the movable blade 41 can only be changed. Therefore, based on the vertical extension line of the front angle 42 of the inner cutter 3b, the fourth angle S4 between the movable blade 41 of each movable blade tooth 4 in the inner cutter 3 and the vertical extension line is 10°~30°, preferably 15°, which is equivalent to tilting the movable blade 41 of each movable blade tooth 4 in the inner cutter 3b toward the lower left side (that is, the side away from the rotation direction). By controlling the inclination angle of the fourth angle S4, the first angle S1b between the movable blade 41 of each movable blade tooth 4 in the inner cutter 3b and the static blade 511 can be adjusted. By adopting the movable blade 41 of this structure, the cutting sharpness between the movable blade 41 and the static blade 511 can be ensured while taking into account the production and hair feeding efficiency of the static blade 5, thereby improving the hair trimming performance of the movable blade 41 and the static blade 511. Secondly, by adjusting the angle of the fourth angle S4 between the movable blade 41 of each movable blade tooth 4 in the inner cutter 3b and the vertical extension line of the front angle 42, the limitation of the fixed angle of the static blade tooth 51 that is difficult to adjust can be avoided, so that the cutting angle between the movable blade 41 of each movable blade tooth 4 in the inner cutter 3b and the static blade 511 can be adjusted according to needs or user requirements, thereby ensuring the cutting sharpness between the movable blade 41 of each movable blade tooth 4 in the inner cutter 3b and the static blade 511, and improving the hair trimming performance of the trimming tool.

[0041] Based on the above embodiments, the present application further provides a pruning tool, including the above pruning cutter head.

[0042] In the accompanying drawings of the present application specification, a pruning tool with a double-acting knife is shown. If a technical solution with a single-acting knife is selected, the inner cutting knife 3b does not need to be installed.

[0043] The above embodiments should not be construed as limiting the present invention, but any improvements made based on the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. Rotary shaver, comprising a blade body (3) provided with a plurality of rotatable cutting moving cutter teeth (4) on the blade body (3); characterized in that At least one moving cutter tooth (4) has a rake angle (42) and a clearance angle (43). When the moving cutter tooth (4) rotates along the stationary cutter (5), the rake angle (42) forms an outer rotation locus (421), and the clearance angle (43) forms an inner rotation locus (431). Among them, the diameter of the outer rotation locus (421) of the rake angle (42) is smaller than that of the inner rotation locus (431) of the clearance angle (43), and the vertical distance T between the rake angle (42) and the clearance angle (43) is smaller than the length of the hair guiding groove (52) in the stationary cutter (5), so that both the outer rotation locus (421) of the rake angle (42) and the inner rotation locus (431) of the clearance angle (43) are within the hair guiding groove (52) of the stationary cutter (5); the rake angle (42) and the clearance angle (43) are connected to form an inclined moving cutter edge (41). When the rake angle (42) approaches any hair guiding groove (52) in the stationary cutter (5), the moving cutter edge (41) and the stationary cutter edge (52) of the stationary cutter tooth (51) between adjacent hair guiding grooves (52) in the stationary cutter (5) form an inclined first included angle S1.

2. The rotary shaver according to claim 1, wherein When each moving cutter tooth (4) contacts the stationary cutter tooth (51) at its rake angle (42), the first included angle S1 between the moving cutter edge (41) and the stationary cutter edge (52) is: 5°≥ S2 ≥30°.

3. The rotary shaver according to claim 1, characterized in that Taking the vertical extension line of the rake angle (42) as a reference, the moving cutter edge (41) and the vertical extension line form a second included angle S2 less than 90°.

4. The rotary shaver according to claim 3, characterized in that Viewed from the axial orthographic projection of the blade body (3), when the vertical extension line of the rake angle (42) of any moving cutter tooth (4) coincides with the vertical center line of the blade body (3), the second included angle S2 between the moving cutter edge (41) in this moving cutter tooth (4) and the vertical center line of the blade body (3) is between 5° and 15°. The moving cutter edges (41) of adjacent moving cutter teeth (4) form the same third included angle S3 and are arranged at an annular interval.

5. A pruning cutter head, characterized in that A rotary shaver according to any one of claims 1 to 4 and a cooperating stationary cutter (5) are included, wherein the stationary cutter (5) is circular, and a plurality of stationary cutter teeth (51) are arranged at intervals in a central radial manner, so that at least two radially spaced trimming rings (53) are formed on the surface of the stationary cutter (5), and hair guiding grooves (52) are respectively formed between adjacent stationary cutter teeth (51) within each trimming ring (53).

6. The pruning cutter head according to claim 5, characterized in that The shaver includes an outer cutter (3a) and an inner cutter (3b). The outer cutter (3a) and the inner cutter (3b) have different diameters and are coaxially mounted on the moving cutter holder (6), and different numbers of moving cutter teeth (4) are formed on the outer cutter (3a) and the inner cutter (3b); the trimming ring (53) includes an outer trimming ring (531) and an inner trimming ring (532). Among them, the outer cutter (3a) rotates along the outer trimming ring (531), and when a plurality of moving cutter teeth (4) in the outer cutter (3a) rotate close to the cutting edge (52) of any static cutter tooth (51) in the outer trimming ring (531), a first included angle S1a is formed between the moving cutting edge (41) in the outer cutter (3a) and the cutting edge (52) of the corresponding static cutter tooth (51); the inner cutter (3b) rotates along the inner trimming ring (532) under the drive of an external force, and when a plurality of moving cutter teeth (4) in the inner cutter (3b) rotate close to the cutting edge (52) of any static cutter tooth (51) in the inner trimming ring (532), a first included angle S1b is formed between the moving cutting edge (41) in the inner cutter (3b) and the cutting edge (52) of the corresponding static cutter tooth (51), where the first included angle S1a and the first included angle S1b are at the same or different angles.

7. The trimming cutter head according to claim 6, characterized in that The first included angle S1a and the first included angle S1b are at different angles, and the first included angle S1a is less than the first included angle S1b, where the first included angle S1b is 10° - 30°.

8. The trimming cutter head according to claim 6, characterized in that Viewed from the orthographic projection direction of the central axis of the inner cutter (3b), the rake angle (42) and the clearance angle (43) of each moving cutter tooth (4) in the inner cutter (3b) are connected to form an inclined moving cutting edge (41), and the vertical distance T between the rake angle (42) and the clearance angle (43) is less than the length of the hair guiding groove (52) in the inner trimming ring (532).

9. The trimming cutter head according to claim 6, characterized in that Based on the vertical extension line of the rake angle (42) of the inner cutter (3b), the fourth included angle S4 between the moving cutting edge (41) of each moving cutter tooth (4) in the inner cutter (3b) and the vertical extension line is 10° - 30°, and the fifth included angle S5 between adjacent moving cutting edges (41) is greater than the fourth included angle S4.

10. A pruning tool, characterized in that It includes the trimming cutter head according to any one of claims 5 - 9.

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