Enclosed hair trimming cutter head and shaving tool

Abstract

The enclosed type hair trimming cutter head is characterized in that each movable cutter tooth in at least one movable cutter is provided with a front angle and a rear angle, the motion trail of the front angle of each movable cutter tooth penetrates through a hair guide groove, and the motion trail of the rear angle of each movable cutter tooth is located outside the closed end of the hair guide groove; when the movable cutter teeth approach to any static cutter tooth, a first included angle S1 is formed between the movable cutting edge and the static cutting edge on the corresponding static cutter tooth, when the front angle of the movable cutter teeth makes contact with the static cutting edge, an enclosed space with the periphery closed temporarily is defined in the hair guide groove, and when the rear angle crosses the static cutting edge, all hair in the enclosed space is cut off. The device has the beneficial effects that when the movable cutter is driven by external force to move along the static cutter to enable the movable cutter teeth to approach any static cutter tooth in the static cutter, a first included angle S1 is formed between the movable cutting edge and the static cutting edge, and when the front angle is in contact with the static cutting edge, a surrounding space with the closed periphery can be defined in the hair guide groove under the cooperation of the movable cutting edge and the static cutting edge; the hair is limited in the enclosed space, so that the hair is effectively prevented from escaping from the hair guide groove.

Description

Technical Field

[0001] The present invention relates to a hair trimming device, and more specifically to an enclosed hair trimming cutter head and a hair removal tool for enclosing and gathering hair for trimming, which are mainly applied to the field of personal care tools such as razors and hair trimmers. Background Art

[0002] The existing rotary trimming cutter head is as shown in the attached Figure 1 As shown, it includes a circular stationary cutter (1), on which there are a number of beard inlet holes (11) arranged at intervals and in an annular array. A number of moving cutter teeth (21) are provided on the moving cutter (2) and are installed on the moving cutter seat (3), and each moving cutter tooth (21) is respectively in contact with the inner surface of the stationary cutter (1). During use, the stationary cutter (1) is in contact with the skin so that the hair on the skin surface extends into the beard inlet holes (11) of the stationary cutter (1). Driven by the moving cutter seat (3) (the moving cutter seat (3) is connected to the output shaft of the motor, Figure 1 not shown in the figure), each moving cutter tooth (21) in the moving cutter (2) rotates along the inner surface of the stationary cutter (1). After the moving cutting edge (211) on each moving cutter tooth (21) contacts the hair extending into the beard inlet hole (11), it will push the hair towards the stationary cutting edge (111) of the beard inlet hole (11) and cut the hair, realizing the trimming of the hair.

[0003] As shown in the enlarged view in the attached Figure 1 As shown in the figure, the existing moving cutting edge (211) of the moving cutter tooth (21) has a front angle (212) and a rear angle (213). The front angle (212) is the part of the moving cutting edge (211) that first contacts the stationary cutting edge (111), and the rear angle (213) is the part of the moving cutting edge (211) that contacts the stationary cutting edge (111) later. Looking at the planar projection of the base of the moving cutter (2), the front angle (212) and the rear angle (213) are connected as an inclined line, and an outward-opening trumpet-shaped angle is formed between the inclined line and the stationary cutting edge (111). In this way, when the moving cutting edge (211) contacts the hair entering the beard inlet hole (11), the hair will be divided into three parts. Among them, the first part exceeds the rotation trajectory of the moving cutting edge (211) and is at the bottom of the beard inlet hole (11) and will not be trimmed; the second part will be cut by the cooperation of the moving cutting edge (211) and the stationary cutting edge (111); and the third part of the hair will escape outward along the inclined line of the moving cutting edge (211) under the push of the moving cutting edge (211), relatively reducing the hair trimming efficiency of the rotary trimming cutter head. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an enclosed hair trimming cutter head and a shaving tool. By improving the moving blade edge of the moving blade, a closed trimming area can be formed when it cooperates with the stationary blade edge, reducing the escape of hair during trimming, increasing the single-time hair trimming amount of the moving blade, and improving the hair trimming efficiency of the trimming cutter head.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is an enclosed hair trimming cutter head, which includes a stationary blade and at least one moving blade that moves relative to the stationary blade. A number of stationary blade teeth are provided on the stationary blade at intervals, and a number of moving blade teeth that cooperate with the stationary blade teeth to cut hair are provided on the moving blade; the characteristic is that a hair guiding groove is formed between adjacent stationary blade teeth in the stationary blade, each hair guiding groove has at least one closed end, each moving blade tooth in at least one moving blade has a rake angle and a clearance angle, the rake angle and the clearance angle are connected to form a moving blade edge, the movement trajectory of the rake angle of each moving blade tooth passes through the hair guiding groove, and the movement trajectory of the clearance angle is outside the closed end of the hair guiding groove; at least one stationary blade edge that cooperates with the moving blade edge to form a shearing force is respectively provided on each stationary blade tooth; when the moving blade tooth approaches any stationary blade tooth under the drive of an external force, a first included angle S1 is formed between the moving blade edge and the stationary blade edge on the corresponding stationary blade tooth, and when the rake angle of the moving blade tooth contacts the stationary blade edge, at least one temporarily closed surrounding space is enclosed in the hair guiding groove, and the hair in the surrounding space can be cut off when the clearance angle moves past the stationary blade edge.

[0006] Preferably, the stationary blade is circular, a number of stationary blade teeth and the hair guiding grooves between adjacent stationary blade teeth are arranged in a circular array to form a trimming ring coaxially arranged with the stationary blade, and each hair guiding groove in the trimming ring has at least one closed end; the moving blade is installed on a moving blade seat and rotates along the trimming ring as the moving blade seat rotates, a number of moving blade teeth in the moving blade are arranged in a circular array, and when any moving blade tooth rotates and approaches any stationary blade tooth in the trimming ring, a first included angle S1 is formed between the moving blade edges on each moving blade tooth and the stationary blade edges on the corresponding stationary blade teeth.

[0007] Preferably, when the external force drives the moving blade tooth to approach any stationary blade tooth, the first included angle S1 between the moving blade edge of the moving blade tooth and the stationary blade edge of the corresponding stationary blade tooth is: 90° > S1 > 0°.

[0008] Preferably, when viewed from the orthographic projection direction of the central axis of the moving blade, the rake angle and the clearance angle of each moving blade tooth in the moving blade are connected to form an inclined moving blade edge. Taking the vertical extension line of the rake angle as a reference, the second included angle S2 between the moving blade edge and the vertical extension line is 15° to 45°, and the third included angle S3 between adjacent moving blade edges is a multiple of the second included angle S2.

[0009] Preferably, a plurality of stationary blade teeth and the hair guide grooves between adjacent stationary blade teeth are in an annular array to form a trimming ring, and the trimming ring is provided with multiple groups of coaxial and radially separated stationary blades formed in a circular shape, and each hair guide groove in at least two trimming rings has at least one closed end; the movable blade includes an outer cutting blade and an inner cutting blade of different diameters, and is coaxially installed in the movable blade seat, and the outer cutting blade rotates along the outer ring trimming ring in the multiple groups of trimming rings under the driving force of the external force, and the multiple movable blade teeth in the outer cutting blade rotate close to the outer ring trimming ring. When the stationary blade of any stationary blade tooth in the shearing ring is cut, a first angle S1 is formed between the movable blade in the external cutter and the stationary blade in the corresponding stationary blade tooth; when the internal cutter is driven by an external force to rotate along the inner ring trimming ring in the multi-ring trimming ring, and when the multiple movable blade teeth in the internal cutter rotate and approach the stationary blade of any stationary blade tooth in the inner ring trimming ring, a fourth angle S4 is formed between the movable blade in the internal cutter and the stationary blade in the corresponding stationary blade tooth, wherein the first angle S1 and the fourth angle S4 are the same or different angles.

[0010] Preferably, the first angle S1 and the fourth angle S4 are different angles, and the first angle S1 is smaller than the fourth angle S4, wherein the fourth angle S4 is 10° to 45°.

[0011] Preferably, the number of movable teeth in the outer cutter and the inner cutter is the same or different.

[0012] Preferably, the number of movable teeth in the outer cutter is different from that in the inner cutter, and the number of movable teeth in the inner cutter is less than that in the outer cutter.

[0013] Preferably, viewed from the positive projection direction of the central axis of the inner cutter, the front angle and the rear angle of each movable blade in the inner cutter are connected to form an inclined movable blade. Taking the vertical extension line of the front angle as a reference, the fifth angle S5 between the movable blade and the vertical extension line is 20° to 60°, and the sixth angle S6 between adjacent movable blades is greater than the fifth angle S5.

[0014] On the basis of the above embodiments, the present application further proposes a technical solution of a shaving tool, which includes the above-mentioned enclosed hair trimming head.

[0015] The beneficial effects of the present invention are as follows: the movement trajectory of the rake angle of the moving blade passes through the hair guiding groove, and the movement trajectory of the clearance angle is located outside the hair guiding groove. When an external force drives the moving blade to move along the stationary blade and the cutting teeth of the moving blade approach any one of the stationary teeth of the stationary blade, a first included angle S1 is formed between the cutting edge of the moving blade and the cutting edge of the stationary blade, that is, the cutting edge of the moving blade is inclined relative to the cutting edge of the stationary blade. In this way, the inclined cutting edge of the moving blade drives the hair entering the hair guiding groove towards the closing end of the hair guiding groove. When the rake angle of the cutting teeth of the moving blade contacts the cutting edge of the stationary blade, a temporarily enclosed space with a closed perimeter can be formed in the hair guiding groove under the cooperation of the cutting edge of the moving blade and the cutting edge of the stationary blade, and the hair will be restricted within this enclosed space, effectively preventing the hair from escaping from the hair guiding groove. Since the movement trajectory of the clearance angle is outside the closing end of the hair guiding groove, when the rake angle and the clearance angle respectively cross the cutting edge of the stationary blade, the hair in the enclosed space can be completely cut off, increasing the single-time hair trimming amount of the cutting teeth of the moving blade and improving the hair trimming efficiency of the hair trimming cutter head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an assembly structure diagram of an existing hair trimming cutter head

[0017] Figure 2 is an assembly structure diagram of the enclosed hair trimming cutter head according to the embodiment of the present invention

[0018] Figure 3 is a front view structure diagram of the moving blade (outer cutting blade) in the embodiment of the present invention

[0019] Figure 4 is a three-dimensional structure diagram of the moving blade (outer cutting blade) in the embodiment of the present invention

[0020] Figure 5 is an assembly schematic diagram of the moving blade (inner cutting blade) in the embodiment of the present invention

[0021] Figure 6 is a front view structure diagram of the stationary blade in the embodiment of the present invention

[0022] Figure 7 is a three-dimensional structure diagram of the stationary blade in the embodiment of the present invention

[0023] Figure 8 is a front view structure diagram of the moving blade (inner cutting blade) in the embodiment of the present invention

[0024] Figure 9 is a three-dimensional assembly structure diagram of the moving blade (outer cutting blade and inner cutting blade) and the moving blade seat in the embodiment of the present invention

[0025] Figure 10 Exploded view of the enclosed hair trimming cutter head with double moving blades assembled in the embodiment of the present invention DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further describes the embodiments of the present invention with reference to the attached Figures 2 to 10 drawings:

[0027] The present invention relates to an enclosed hair trimming cutter head, which includes a stationary cutter 4 and at least one movable cutter 5 that moves relative to the stationary cutter 4. A number of stationary cutter teeth 41 are provided on the stationary cutter 4 at intervals, and a plurality of movable cutter teeth 51 are provided on the movable cutter 5. The movable cutter teeth 51 move relative to the stationary cutter teeth 41 to cut hair. A hair guiding groove 42 is formed between adjacent stationary cutter teeth 41 in the stationary cutter 4 for guiding hair. Each hair guiding groove 42 has at least one closed end to prevent hair from slipping in from one end and out from the other end. One or more movable cutters 5 can be installed in the stationary cutter 4 to improve the hair trimming efficiency. Each movable cutter tooth 51 in at least one movable cutter 5 has a rake angle 511 and a clearance angle 512. The rake angle 511 refers to the part of the movable cutter tooth 51 that first contacts the side edge of the stationary cutter 4 to form a shearing force when moving relative to the stationary cutter tooth 41 (which can be understood as the start of hair shearing by a single stationary cutter tooth 41), and the clearance angle 512 refers to the part that finally forms a shearing force with the side edge of the stationary cutter tooth 41 (which can be understood as the end of hair shearing by a single stationary cutter tooth 41). The rake angle 511 and the clearance angle 512 are connected to form a cutting edge 52 of the movable cutter, that is, the rake angle 511 and the clearance angle 512 also belong to a part of the cutting edge 52 of the movable cutter.

[0028] When the movable cutter 5 rotates along the stationary cutter 4 under the drive of an external force, the movement trajectories of the rake angles 511 of each movable cutter tooth 51 all pass through the hair guiding groove 42, and the movement trajectory of the clearance angle 512 is outside the closed end of the hair guiding groove 42. At least one stationary cutting edge 43 that cooperates with the cutting edge 52 of the movable cutter to form a shearing force is respectively provided on each stationary cutter tooth 41. When the movable cutter tooth 51 approaches any stationary cutter tooth 41 in the stationary cutter 4 under the drive of an external force, a first included angle S1 is formed between the cutting edge 52 of the movable cutter and the stationary cutting edge 43, that is, the cutting edge 52 of the movable cutter is inclined relative to the stationary cutting edge 43. In this way, the inclined cutting edge 52 of the movable cutter drives the hair entering the hair guiding groove 42 in the direction of the closed end of the hair guiding groove 42. When the rake angle 511 of the movable cutter tooth 51 contacts the stationary cutting edge 43, a temporarily enclosed space 44 that is closed on all sides can be formed in the hair guiding groove 42 under the cooperation of the cutting edge 52 of the movable cutter and the stationary cutting edge 43 (as well as the bottom edge of the hair guiding groove 42, and the bottom edge of the hair guiding groove 42 can also be regarded as a part of the stationary cutting edge 43). The hair will be restricted within the enclosed space 44, effectively preventing the hair from escaping from the hair guiding groove 42. Since the movement trajectory of the clearance angle 512 is outside the closed end of the hair guiding groove 42, when the rake angle 511 and the clearance angle 512 respectively cross the stationary cutting edge 43, all the hair in the enclosed space 44 can be cut off, increasing the single - time hair trimming amount of a single movable cutter tooth 51 and improving the hair trimming efficiency of the hair trimming cutter head.

[0029] Secondly, a first included angle S1 is formed between the cutting edge 52 of the movable cutter and the stationary cutting edge 43, that is, the cutting edge 52 of the movable cutter is inclined relative to the stationary cutting edge 43, correspondingly adjusting the cutting angle between the cutting edge 52 of the movable cutter and the stationary cutting edge 43, making the cutting sharpness between the cutting edge 52 of the movable cutter and the stationary cutting edge 43 higher and the hair trimming performance better.

[0030] The so-called temporarily four-sided closed enclosure space 44 refers to the four-sided closed space temporarily formed between the moving cutting edge 52 of the moving cutter tooth 51 and the side wall of the hair guide groove 42 when any moving cutter tooth 51 in the moving cutter 5 approaches any hair guide groove 42 in the stationary cutter 4. When the back angle 512 of the moving cutter tooth 51 passes over the corresponding hair guide groove 42, the temporarily four-sided closed enclosure space 44 also disappears and forms in the next adjacent hair guide groove 42.

[0031] To prevent the hair that enters the hair guide groove 42 from escaping from the hair guide groove 42 under the drive of the moving cutting edge 52, when the moving cutter tooth 51 is driven by an external force to approach any stationary cutter tooth 41, the first included angle S1 formed between the moving cutting edge 52 of the moving cutter tooth 51 and the stationary cutting edge 43 of the corresponding stationary cutter tooth 41 is: 90° > S > 0°; the larger the angle of the first included angle S1 between the moving cutting edge 52 and the stationary cutting edge 43, when the front angle 511 of the moving cutter tooth 51 contacts the stationary cutting edge 43, the area of the temporarily enclosed space 44 in the hair guide groove 42 is larger, and more hair to be cut can be enclosed and accommodated. Relatively, a greater shearing force is required to achieve hair trimming, which puts higher requirements on the torque of the drive mechanism. On the contrary, if the angle of the first included angle S1 between the moving cutting edge 52 and the stationary cutting edge 43 is smaller, when the front angle 511 of the moving cutter tooth 51 contacts the stationary cutting edge 43, the area of the temporarily enclosed space 44 in the hair guide groove 42 becomes relatively smaller, and the amount of hair to be cut that can be accommodated in the corresponding enclosed space 44 decreases. To balance the hair trimming effect and cutting sharpness of the trimming cutter head, in this embodiment, the first included angle S1 between the moving cutting edge 52 and the stationary cutting edge 43 is preferably: 30° > S ≥ 5°, and the specific angle can be determined according to actual needs, and this embodiment is not further limited.

[0032] The above technical solution can be applied not only to the reciprocating hair trimming cutter head but also to the rotary hair trimming cutter head. When applied to the reciprocating hair trimming cutter head, it is necessary to set an inclined included angle on both sides of the moving cutter tooth 51 relative to the stationary cutting edge 43, and the moving cutting edge 52 that can form a temporarily four-sided closed enclosure space 44 in the hair guide groove 42 is sufficient. For the rotary hair trimming cutter head, only the moving cutting edge 52 needs to be set on one side of the moving cutter tooth 51. Therefore, in this embodiment, the rotary hair trimming cutter head is preferably selected.

[0033] The following presents two implementation manners applied to the rotary hair trimming cutter head. One is the implementation manner of the single moving cutter enclosed hair trimming cutter head:

[0034] Embodiment 1

[0035] For the convenience of rotary trimming of hair, the stationary blade 4 is circular. A plurality of stationary blade teeth 41 and the hair guide grooves 42 between adjacent stationary blade teeth 41 are arranged in an annular array to form a trimming ring 45 coaxially arranged with the stationary blade 4. Each hair guide groove 42 in the trimming ring 45 has at least one closed end; the moving blade 5 is installed on the moving blade seat 6 and rotates along the trimming ring 45 as the moving blade seat 6 rotates. Each moving blade tooth 51 in the moving blade 5 has a rake angle 511 and a clearance angle 512. The rake angle 511 and the clearance angle 512 are connected to form a moving blade edge 52. The rotational movement trajectory of the rake angle 511 passes through the hair guide groove 42, and the rotational trajectory of the clearance angle 512 is outside the closed end of the hair guide groove 42. At least one stationary blade edge 43 that cooperates with the moving blade edge 52 to form a shearing force is provided on each stationary blade tooth 41. When the moving blade tooth 51 approaches any stationary blade tooth 41 in the stationary blade 4 under the action of an external force, a first included angle S1 is formed between the moving blade edge 52 and the stationary blade edge 43. The first included angle S1 is 6°±1°, that is, the moving blade edge 52 is inclined relative to the stationary blade edge 43. In this way, the inclined moving blade edge 52 can be used to drive the hair entering the hair guide groove 42 in the direction of the closed end of the hair guide groove 42, and the relatively small first included angle S1 can maximize the cutting sharpness of the moving blade tooth 51, so that the moving blade edge 52 can cut off the hair when it contacts the hair, avoiding phenomena such as hair jamming and hair pulling caused by excessive concentration of hair and inability to cut off the hair.

[0036] When the rake angle 511 of the moving blade tooth 51 contacts the stationary blade edge 43, the moving blade edge 52 and the stationary blade edge 43 (and the bottom edge of the hair guide groove 42, and the bottom edge of the hair guide groove 42 can also be regarded as a part of the stationary blade edge 43) can cooperate to enclose a temporarily closed surrounding space 44 in the hair guide groove 42, and the hair is restricted in the temporary surrounding space 44, effectively preventing the hair from escaping from the hair guide groove 42. Since the rotational trajectory of the clearance angle 512 is outside the closed end of the hair guide groove 42, when the rake angle 511 and the clearance angle 512 respectively cross the stationary blade edge 43, all the hair in the surrounding space 44 can be cut off, improving the single-time hair trimming amount of a single moving blade tooth 51 and enhancing the hair trimming efficiency of the hair trimming cutter head.

[0037] Of course, the inclination angle of the first included angle S1 between each moving cutting edge 52 and the static cutting edge 43 can also be set larger. However, if it is set too large, such as 45°, 60°, or 80°, etc., the width of the moving cutter teeth 51 will be correspondingly reduced, thereby reducing the working strength of the moving cutter teeth 51. When there is a lot of hair, the moving cutter teeth 51 are prone to twist and deform, affecting the hair trimming performance of the moving cutter teeth 511. Moreover, when the inclination angle of the first included angle S1 is too large, the area of the enclosing space 44 will also increase. When too much hair to be trimmed is concentrated in the same hair guiding groove 42, a higher requirement will be imposed on the output torque of the driving mechanism, and correspondingly, the driving mechanism (i.e., the motor, not shown in the figure) will be increased. Secondly, when the first included angle S1 has too large an inclination angle, the cutting sharpness between the moving cutting edge 52 and the static cutting edge 43 will also be reduced, reducing the hair trimming performance of the trimming cutter head. Therefore, it is a preferred embodiment that the first included angle S1 is set to 6°.

[0038] Viewed from the orthographic projection direction of the central axis of the driven cutter 5, the rake angle 511 and the clearance angle 512 of each moving cutter tooth 51 in the driven cutter 5 are connected to form an inclined moving cutting edge 52. Based on the vertical extension line of the rake angle 511 (the vertical extension line must be parallel to the central axis of the driven cutter 5 or the outer cutting cutter 5a), the second included angle S2 between the moving cutting edge 52 and the vertical extension line is 15° to 45°, and the third included angle S3 between adjacent moving cutting edges 52 is a multiple of the second included angle S2. In the actual production process, the angular value of the second included angle S2 between the moving cutting edge 52 and the vertical extension line is an integer divisor of the circumferential angle, so that the interval angles of adjacent moving cutter teeth 51 in the driven cutter 5 are the same, ensuring the balance and working stability of the driven cutter 5 during rotary cutting. The second included angle S2 is preferably 15°.

[0039] The third included angle S3 between adjacent moving cutting edges 52 is preferably a low multiple, such as 2 times. The smaller the multiple, the more the number of moving cutter teeth 51 in the driven cutter 5. When the output rotational speed of the driving mechanism remains unchanged per unit time, the more the number of moving cutter teeth 51, the higher the trimming frequency of the same position hair guiding groove 42 in the static cutter 4, correspondingly improving the hair trimming efficiency. According to this rule, during actual production, a driving mechanism (motor) with a relatively low rotational speed can be appropriately selected to reduce the cost of the driving mechanism.

[0040] Of course, a relatively large multiple can also be selected for the third included angle S3, such as 4 or 5 times, etc. A high multiple means that the number of moving cutter teeth 51 in the moving cutter 5 decreases. To ensure the hair trimming efficiency of the moving cutter teeth 51, there are usually only two methods. The first is to select a driving mechanism (i.e., a motor) with a higher rotational speed and use the high rotational speed to make up for the shortage of the small number of moving cutter teeth 51 to ensure the hair trimming efficiency of the moving cutter teeth 51. The second is not to increase the rotational speed of the driving mechanism (i.e., the motor). In this way, the time for the same moving cutter tooth 51 to pass through the same hair guiding groove 42 in the stationary cutter 4 will become longer, which means that more hairs to be trimmed can enter the hair guiding groove 42. When the number of hairs to be trimmed increases, a higher shearing force is required for the moving cutter teeth 51. At this time, a driving mechanism with a higher output torque needs to be selected to increase the shearing force of the moving cutter teeth 51 to ensure the hair trimming performance. However, no matter which method is used, the cost of the driving mechanism will be increased. Therefore, it is an optimal implementation method to select a low multiple for the third included angle S3.

[0041] The following provides an implementation method of an enclosed hair trimming cutter head with double moving cutters:

[0042] Embodiment 2

[0043] To increase the hair inlet area of the hair trimming cutter head and improve the hair trimming efficiency, a plurality of stationary cutter teeth 41 and the hair guiding grooves 42 between adjacent stationary cutter teeth 41 are arranged in a circular array to form a trimming ring 45. The stationary cutter 4 is circular and is provided with multiple concentric and radially separated trimming rings 45. During actual production, two trimming rings 45 are provided. By setting two trimming rings 45, the length of the hair guiding grooves 42 in each trimming ring 45 is correspondingly reduced. When trimming hair, the moving space of the hair becomes smaller and can be quickly cut by the moving cutter 5, thus improving the hair trimming efficiency. Secondly, the two trimming rings 45 are arranged in a radially separated manner. At least one closed end will exist in the hair guiding grooves 42 in each trimming ring 45, and the closed ends of the hair guiding grooves 42 in the two trimming rings 45 are close to each other. In this way, the surface utilization rate of the stationary cutter 4 can be maximally improved, the effective hair inlet area on the surface of the stationary cutter 4 can be expanded, and the hair inlet efficiency of the stationary cutter 4 can be improved.

[0044] In addition, by setting two trimming rings 45 in the stationary cutter 4, the shapes of the hair guiding grooves 42 in the two trimming rings 45 can also be controlled to cope with different forms of hair, such as Figure 6 and 7 shown. The hair guiding grooves 42 in the outer trimming ring 45 can be set in an open shape, which is convenient for relatively long or curly hairs to enter the hair guiding grooves 42 from the circumferential side wall of the stationary cutter 4, thereby improving the hair inlet efficiency of the stationary cutter 4.

[0045] To meet the hair trimming requirements of the two trimming rings 45 in the stationary blade 4, the moving blade 5 includes an outer cutting blade 5a and an inner cutting blade 5b, which are coaxially installed on the moving blade seat 6. When the driving mechanism (not shown in the figure) drives the moving blade seat 6 to rotate, the outer cutting blade 5a and the inner cutting blade 5b can respectively rotate along the two trimming rings 45 in the stationary blade 4. When the outer cutting blade 5a and the inner cutting blade 5b are driven to rotate along the corresponding trimming rings 45 respectively by an external force, the movement trajectory of the front angle 511 of the outer cutting blade 5a passes through each hair guiding groove 42 in the outer trimming ring 45, and the movement trajectory of the rear angle 512 of the outer cutting blade 5a is outside each hair guiding groove 42 in the outer trimming ring 45. In this way, the moving cutting edge 52 in the outer cutting blade 5a drives the hair downward and can form a first included angle S1 with the stationary cutting edge 43 of any stationary cutting tooth 41 in the outer trimming ring 45. And when the moving cutting edge 52 contacts the stationary cutting edge 43, a temporarily closed surrounding space 44 is enclosed within the hair guiding groove 42, as Figure 2 shown. When the rear angle 512 of the moving cutting tooth 51 in the outer cutting blade 5a crosses the stationary cutting edge 43, all the hair in the hair guiding groove 42 can be cut off, improving the single - time hair trimming amount of each moving cutting tooth 51 in the outer cutting blade 5a and enhancing the hair trimming efficiency.

[0046] The moving cutting edges 52 on each moving cutting tooth 51 of the inner cutting blade 5b located below the inner trimming ring 45 can only drive the hair upward and form a fourth included angle S4 with the stationary cutting edge 43 of any stationary cutting tooth 41 in the inner trimming ring 45. And when the moving cutting edge 52 contacts the stationary cutting edge 43, a temporarily closed surrounding space 44 is enclosed within the hair guiding groove 42, as Figure 5 shown. When the rear angle 512 moves across the corresponding stationary cutting edge 4 of the blade, all the hair in the surrounding space 44 can be cut off, improving the single - time hair trimming amount of each moving cutting tooth 51 in the inner cutting blade 5b and enhancing the hair trimming effect.

[0047] Setting the moving blade 5 as a split outer cutting blade 5a and inner cutting blade 5b not only facilitates the production and processing of the outer cutting blade 5a and the inner cutting blade 5b, but also facilitates the production and assembly of the moving blade 5, improving the assembly efficiency. Of course, when setting two trimming rings 45 in the stationary blade 4, the moving blade 5 can also be set as one, but setting groups of moving cutting teeth 51 with different diameters on one moving blade 5 can also rotate along the corresponding two trimming rings 45 to cooperate with the stationary cutting teeth 41 to cut off the hair. However, setting two groups of moving cutting teeth 51 with different diameters on one moving blade 5 is not conducive to production and processing. Therefore, setting two independent outer cutting blade 5a and inner cutting blade 5b is the preferred implementation mode.

[0048] Those skilled in the art should be aware that, based on the above-disclosed technical solution, more trimming rings 45 can also be provided in the stationary blade 4, such as three or four rings, and the moving blade 5 can also be provided with three independent moving blades 5 as needed or with groups of moving blade teeth 51 arranged in three different diameters on one moving blade 5. Therefore, the two-ring trimming rings 45 or the two independent outer cutting blades 5a and inner cutting blades 5b disclosed above do not limit this application. Those skilled in the art can increase or decrease the trimming rings 45 and the moving blade 5 according to actual needs. As long as the movement trajectory of the rake angle 511 of the moving blade teeth 51 passes through the hair guiding groove 42 and the movement trajectory of the clearance angle 512 is outside the hair guiding groove 42 to enclose the hair guiding groove 42 into a temporarily closed enclosed space 44, the technical purpose to be achieved by this application and the technical effects to be produced by this application can be achieved.

[0049] The stationary blade teeth 41 in the stationary blade 4 are arranged at intervals in a central radial pattern, which results in the cross-sectional area of the hair guiding groove 42 in the inner trimming ring 45 being smaller than that of the hair guiding groove 42 in the outer trimming ring 45. During use, affected by the reduction of the cross-sectional area of the hair guiding groove 42 in the inner trimming ring 45, the hair feeding effect is relatively poor. Therefore, to ensure the hair feeding effect of each hair guiding groove 42 in the outer and inner trimming rings 45, the first angle S1 and the fourth angle S4 are set at different angles according to the different cross-sectional areas of the hair guiding grooves 42. Moreover, the angle of the first angle S1 is smaller than that of the fourth angle S4. Since the cross-sectional area of each hair guiding groove 42 in the outer trimming ring 45 is relatively large, it is easier for the hair to be cut to enter each hair guiding groove 42 in the outer trimming ring 45. To control the hair feeding amount and avoid the phenomenon of pulling or jamming of the hair caused by excessive hair that cannot be completely cut off at one time, the first angle S1 is set at a relatively small angle, preferably 6°±1°. In this way, not only can the moving blade teeth 51 of the outer cutting blade 5a itself play a certain blocking role to control the hair feeding amount of each hair guiding groove 42 in the outer trimming ring 45, but also the smaller the angle, the higher the sharpness, which can ensure the hair trimming performance of the outer cutting blade 5a and avoid the phenomenon of pulling or jamming of the hair caused by the hair not being able to be cut off at one time, thus improving the working stability and use comfort of the trimming cutter head.

[0050] Since the cross-sectional area of each hair guiding groove 42 in the inner trimming ring 45 is relatively small, in order to improve the hair feeding efficiency of each hair guiding groove 42 in the inner trimming ring 45, the angle of the fourth included angle S4 is set relatively large. The angle range of the fourth included angle S4 is 10° to 45°, preferably 30° ± 1°. By setting a larger angle, the blocking of each moving cutter tooth 51 in the inner cutter 5b against each hair guiding groove 42 in the inner trimming ring 45 can be reduced, thereby improving the hair feeding efficiency of each hair guiding groove 42 in the inner trimming ring 45. Of course, the first included angle S1 and the fourth included angle S4 can also be set to the same angle. However, setting the same angle will significantly reduce the hair feeding effect of each hair guiding groove 42 in the inner trimming ring 45, or cause excessive hair feeding in each hair guiding groove 42 in the outer trimming ring 45. Therefore, it is a preferred implementation mode that the first included angle S1 and the fourth included angle S4 adopt different angles.

[0051] Since the outer cutter 5a and the inner cutter 5b are installed on the moving cutter seat 6 with different diameters and coaxially, in actual production, the outer cutter 5a and the inner cutter 5b can be set to have the same or different numbers of moving cutter teeth 51. However, due to the different diameters of the outer cutter 5a and the inner cutter 5b, if the same number of moving cutter teeth 51 is selected, the interval angle of the moving cutter teeth 51 on the inner cutter 5b will become relatively smaller and too dense, which is not conducive to the production and processing of the inner cutter 5b. Therefore, in this embodiment, it is a preferred implementation mode that the outer cutter 5a and the inner cutter 5b are selected to have different numbers of moving cutter teeth 51, that is, the number of moving cutter teeth 51 of the inner cutter 5b is less than the number of moving cutter teeth 51 of the outer cutter 5a. By setting different numbers of moving cutter teeth 51, when coaxially installed on the moving cutter seat 6, the moving cutter teeth 51 of the outer cutter 5a and the inner cutter 5b can be staggered, so as to avoid mutual interference between the outer cutter 5a and the inner cutter 5b during the trimming process, prevent the cut broken hairs from concentrating in one place, delay the discharge of the broken hairs and cause blockage of the hair guiding groove 42, and ensure the working stability of the trimming cutter head and the hair trimming efficiency.

[0052] Viewed from the orthographic projection direction of the central axis of the inner cutter 5b, the rake angle 511 and the clearance angle 512 of each moving cutter tooth 51 in the inner cutter 5b are connected to form an inclined cutting edge 52. Based on the perpendicular extension line of the rake angle 511 (the perpendicular extension line must be parallel to the central axis of the inner cutter 5b), the fifth included angle S5 between the cutting edge 52 and the perpendicular extension line is 20° to 60°, preferably 35°. The sixth included angle S6 between adjacent cutting edges 52 is greater than the fifth included angle S5. In actual production, the angle value of the sixth included angle S6 is 40°, so that the inner cutter 5b can be equally divided into 9 moving cutter teeth 51.

[0053] In the accompanying drawings of the specification of this application, a double-moving-cutter enclosed hair trimming cutter head is shown. If a single-moving-cutter technical solution is selected, the inner cutter 5b does not need to be installed.

[0054] On the basis described above, the present applicant also proposes a technical solution for a hair removal tool, which includes any one of the above two embodiments of the enclosed hair trimming cutter head.

[0055] The above embodiments should not be regarded as a limitation to the present invention, but any improvement made based on the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. An enclosed hair trimming cutter head, comprising a stationary cutter (4) and at least one movable cutter (5) that moves relative to the stationary cutter (4). A plurality of stationary cutter teeth (41) are provided on the stationary cutter (4) at intervals, and a plurality of movable cutter teeth (51) that cooperate with the stationary cutter teeth (41) to cut hair are provided on the movable cutter (5); characterized in that Between adjacent static cutter teeth (41) in the static cutter (4), a hair guiding groove (42) is formed. Each hair guiding groove (42) has at least one closed end. In each of at least one moving cutter (5), each moving cutter tooth (51) has a front angle (511) and a rear angle (512). The front angle (511) and the rear angle (512) are connected to form a moving cutter edge (52). The movement trajectory of the front angle (511) of each moving cutter tooth (51) passes through the hair guiding groove (42), and the movement trajectory of the rear angle (512) is outside the closed end of the hair guiding groove (42). At least one static cutter edge (43) that cooperates with the moving cutter edge (52) to form a shearing force is provided on each static cutter tooth (41). When the moving cutter tooth (51) approaches any static cutter tooth (41) under the drive of an external force, a first included angle S1 is formed between the moving cutter edge (52) and the static cutter edge (43) on the corresponding static cutter tooth (41). When the front angle (511) of the moving cutter tooth (51) contacts the static cutter edge (43), at least one temporarily closed surrounding space (44) is enclosed within the hair guiding groove (42). When the rear angle (512) moves past the static cutter edge (43), the hair within the surrounding space (44) can be cut off.

2. The enclosed hair trimming cutter head according to claim 1, characterized in that The static cutter (4) is circular. A plurality of static cutter teeth (41) and the hair guiding grooves (42) between adjacent static cutter teeth (41) are arranged in a circular array to form a trimming ring (45) coaxially arranged with the static cutter (4). Each hair guiding groove (42) within the trimming ring (45) has at least one closed end. The moving cutter (5) is installed on the moving cutter seat (6) and rotates along the trimming ring (45) following the rotation of the moving cutter seat (6). A plurality of moving cutter teeth (51) in the moving cutter (5) are arranged in a circular array. When any moving cutter tooth (51) rotates and approaches any static cutter tooth (41) in the trimming ring (45), a first included angle S1 is formed between the moving cutter edge (52) on each moving cutter tooth (51) and the static cutter edge (43) on the corresponding static cutter tooth (41).

3. The enclosed hair trimming cutter head according to claim 1, wherein When an external force drives the moving cutter tooth (51) to approach any static cutter tooth (41), the first included angle S1 between the moving cutter edge (52) of the moving cutter tooth (51) and the static cutter edge (43) of the corresponding static cutter tooth (41) is: 90° > S1 > 0°.

4. The enclosed hair trimming cutter head according to claim 1, wherein Viewed from the orthographic projection direction of the central axis of the moving cutter (5), the front angle (511) and the rear angle (512) of each moving cutter tooth (51) in the moving cutter (5) are connected to form an inclined moving cutter edge (52). Based on the vertical extension line of the front angle (511), the second included angle S2 between the moving cutter edge (52) and the vertical extension line is 15° - 45°. The third included angle S3 between adjacent moving cutter edges (52) is a multiple of the second included angle S2.

5. The enclosed hair trimming cutter head according to claim 1, characterized in that A plurality of stationary cutter teeth (41) and the hair guide grooves (42) between adjacent stationary cutter teeth (41) form a trimming ring (45) in an annular array. There are multiple groups of the trimming rings (45) which are coaxial and radially separated and formed in a circular stationary cutter (4). Each of the hair guide grooves (42) in at least two trimming rings (45) has at least one closed end; the moving cutter (5) includes an outer cutting cutter (5a) and an inner cutting cutter (5b) with different diameters and is coaxially installed in a moving cutter seat (6). The outer cutting cutter (5a) is driven by an external force to rotate along the outer trimming ring (45) among multiple groups of trimming rings (45). When the multiple moving cutter teeth (51) in the outer cutting cutter (5a) rotate close to the stationary cutting edge (43) of any stationary cutter tooth (41) in the outer trimming ring (45), a first included angle S1 is formed between the moving cutting edge (52) in the outer cutting cutter (5a) and the stationary cutting edge (43) in the corresponding stationary cutter tooth (41); the inner cutting cutter (5b) is driven by an external force to rotate along the inner trimming ring (45) among multiple trimming rings (45). When the multiple moving cutter teeth (51) in the inner cutting cutter (5b) rotate close to the stationary cutting edge (43) of any stationary cutter tooth (41) in the inner trimming ring (45), a fourth included angle S4 is formed between the moving cutting edge (52) in the inner cutting cutter (5b) and the stationary cutting edge (43) in the corresponding stationary cutter tooth (41). Among them, the first included angle S1 and the fourth included angle S4 are at the same or different angles.

6. The enclosed hair trimming cutter head according to claim 5, characterized in that The first included angle S1 and the fourth included angle S4 are at different angles, and the first included angle S1 is less than the fourth included angle S4, where the fourth included angle S4 is 10° - 45°.

7. The enclosed hair trimming cutter head according to claim 5, characterized in that The number of moving cutter teeth (51) in the outer cutting cutter (5a) is the same as or different from that in the inner cutting cutter (5b).

8. The enclosed hair trimming cutter head according to claim 5, wherein The number of moving cutter teeth (51) in the outer cutting cutter (5a) is different from that in the inner cutting cutter (5b), and the number of moving cutter teeth (51) in the inner cutting cutter (5b) is less than that in the outer cutting cutter (5a).

9. The enclosed hair trimming cutter head according to claim 5, wherein Viewed from the direction of the orthographic projection of the central axis of the inner cutting cutter (5b), the rake angle (511) and the clearance angle (512) of each moving cutter tooth (51) in the inner cutting cutter (5b) are connected to form an inclined moving cutting edge (52). Based on the perpendicular extension line of the rake angle (511), the fifth included angle S5 between the moving cutting edge (52) and the perpendicular extension line is 20° - 60°, and the sixth included angle S6 between adjacent moving cutting edges (52) is greater than the fifth included angle S5.

10. A hair removal tool, characterized in that Comprising the enclosed hair trimming cutter head according to any one of claims 1 - 9.

Images