Moving cutter and blade assembly forming asymmetric cutter teeth

Abstract

The utility model provides a moving cutter and blade assembly forming asymmetric cutter teeth, which is characterized in that a connecting structure used for being connected with a power piece in a limiting manner is arranged on a substrate, and two cutter tooth groups are respectively and asymmetrically arranged at the edges of two sides of the substrate at different intervals by taking the center line of the connecting structure as a reference. The utility model has the following beneficial effects: by controlling the cutter tooth groups and the center line of the connecting structure to form different distances, after the moving cutter is assembled by taking the connecting structure as a reference, the cutter tooth groups on two sides of the moving cutter and the static cutter teeth on two sides of the static cutter can form two different cutting distances, and the cutter tooth group with larger cutting distance can cut long hair short, so that the cutting efficiency is improved. The cutter tooth sets with the small cutting distance can conduct secondary trimming on the short hair, the hair trimming effect is improved, additional auxiliary tools (such as a scraper and the like) are not needed, the tool use cost of a user is reduced, one movable cutter can achieve two different trimming effects, and the use range of the movable cutter is expanded.

Description

Technical Field

[0001] The utility model relates to a hair trimming device, and more specifically to a moving blade and a blade assembly with asymmetric cutter teeth, which are mainly applied to the fields of personal care tools such as razors and hair trimmers. Background Art

[0002] During the process of trimming hair, the residual length of hair roots on the skin surface is mainly controlled by two factors. One is to lift the hair with a comb and then move the blade assembly along the comb to cut the hair. In this trimming method, the residual length of hair roots on the skin surface is determined by the distance between the comb and the skin or the thickness of the comb itself. The other is to directly make the blade assembly contact and move along the skin in a vertical or nearly vertical state without using a comb to cut the hair. In this trimming method, the residual length of hair roots on the skin surface is mainly determined by the distance between the tips of the moving cutter teeth in the moving blade and the tips of the stationary cutter teeth in the stationary blade.

[0003] Currently, for a moving blade with moving cutter teeth arranged on both sides, the moving cutter teeth on both sides are symmetrically arranged, which means that the distance between the tips of each moving cutter tooth and the tips of each stationary cutter tooth in the stationary blade is equal. When trimming hair without using a comb, such as trimming body hair, or for the hair on the sideburns, ear sides or back of the neck on the face, although the same tip distance can cut the hair short, a manual scraper is still needed to finely trim the cut hair. Therefore, users need to purchase different functional hair trimming tools to meet the hair trimming needs. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a moving blade and a blade assembly with asymmetric cutter teeth. The cutter tooth groups on both sides of the moving blade are arranged asymmetrically, so that different cutting spacings can be formed by the cutter tooth groups on both sides of the moving blade during use to control the length of stubble (i.e., the residual hair roots on the skin surface), improve the application range of the blade assembly, and realize multiple functions with one machine.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is a moving blade with asymmetric cutter teeth, which includes a base plate. Cutter tooth groups are respectively arranged at the two side edges of the base plate. Each cutter tooth group includes a plurality of moving cutter teeth arranged side by side at intervals, and a hair inlet groove is formed between adjacent moving cutter teeth. A connection structure for limit connection with a power component is arranged on the base plate. Taking the center line of the connection structure as a reference, the two cutter tooth groups are arranged asymmetrically at the two side edges of the base plate with different spacings.

[0006] Preferably, the lengths and shapes of the moving cutter teeth in the two cutter tooth groups are the same and / or different.

[0007] Preferably, the limit connection between the connection structure and the power component is a shaft hole fit structure or a groove rail fit structure.

[0008] Preferably, the cutter tooth group includes a short tooth group and a long tooth group. The moving cutter teeth include short teeth and long teeth. A plurality of short teeth arranged side by side at intervals form the short tooth group together with the hair feeding groove; a plurality of long teeth arranged side by side at intervals and the hair feeding groove form the long tooth group; wherein, the length H1 of the short teeth is less than the length H2 of the long teeth.

[0009] Preferably, the short teeth and the long teeth are arranged in different shapes.

[0010] Preferably, with the center line of the connecting structure as a reference, a first distance L1 is formed between the outer side surface of the short teeth and the center line, and a second distance L2 is formed between the outer side surface of the long teeth and the center line; wherein, the second interval L2 is greater than the first distance L1, so that the long tooth group and the short tooth group are arranged asymmetrically.

[0011] Preferably, the short tooth group and the long tooth group are respectively bent with respect to the substrate, so that a height difference is formed between the cutting working surfaces in the short tooth group and the long tooth group and the surface of the substrate, and an air flow channel is formed when the cutting working surfaces are in contact with the mating blades.

[0012] Based on the above moving cutter, the applicant also proposes a technical solution for a cutter head assembly, which includes the above moving cutter forming asymmetric cutter teeth and a stationary cutter cooperating therewith. Stationary cutter teeth are symmetrically formed on opposite sides of the stationary cutter. Each short tooth in the short tooth group of the moving cutter fits with one of the stationary cutter teeth on one side of the two sides of the stationary cutter, and a third distance L3 is formed between the outer side of the end of each short tooth and the outer side of the end of the stationary cutter tooth; the outer side surface of the end of each long tooth in the long tooth group of the moving cutter fits with the stationary cutter tooth on the other side of the stationary cutter, and a fourth distance L4 is formed between the outer side of the end of each long tooth and the outer side of the end of the stationary cutter tooth, wherein, the third distance L3 is greater than the fourth distance L4.

[0013] Preferably, a guiding groove is provided at the center of the surface of the stationary cutter opposite to the moving cutter. The connecting structure in the moving cutter is at least one through hole penetrating the substrate. The power member presses on the moving cutter and a limiting post is provided at a corresponding position. The limiting post is inserted into the through hole and its end is placed in the guiding groove to form a guiding and limiting fit.

[0014] Preferably, at least one counterbore is respectively provided at the two end edges of the mating surface of the stationary cutter and the moving cutter. One end of the inner screw sleeve is placed in the counterbore and is fixedly connected with the stationary cutter as a whole, and the other end protrudes from the surface of the stationary cutter. The stationary cutter seat covers the stationary cutter and is fixedly connected by bolts, and the power member and the moving cutter are restricted between the stationary cutter and the stationary cutter seat, so that the moving cutter, the stationary cutter, the power member and the stationary cutter seat form a whole.

[0015] Preferably, an elastic member is provided between the power member and the stationary cutter seat, so that the short tooth group and the long tooth group of the moving cutter always keep end face fitting with the stationary cutter teeth on both sides of the stationary cutter.

[0016] Preferably, when viewed from the front projection of either end of the stationary blade, at least a part of the surface of the stationary blade in contact with the skin is inclined, such that the tip thickness of at least one side and / or both sides of the stationary blade teeth is less than the root thickness; or, when both sides of the substrate are locally inclined, the inclination angles on both sides are set to be the same or different.

[0017] Preferably, when viewed from the front projection of either end of the stationary blade seat, the width of the stationary blade seat is less than the width of the stationary blade; when viewed from the front projection of either side of the stationary blade seat, limiting grooves are provided on the two side walls of the stationary blade seat, and the short tooth group and the long tooth group in the moving blade respectively pass through the limiting grooves and are placed outside the stationary blade seat to keep the end faces in contact with the corresponding stationary blade teeth in the stationary blade.

[0018] Preferably, a fifth spacing L5 is formed between the surface of the substrate in the moving blade and the bottom surface of the limiting groove, and the fifth spacing L5 is less than the depth L6 of the end of the limiting post inserted into the guiding groove.

[0019] Preferably, a protruding and annular mounting seat is provided on the outer surface of the stationary blade seat, and rotating clamping grooves for detachably fixing the stationary blade seat to the machine body are provided at opposite positions on the circumferential side wall of the mounting seat.

[0020] The beneficial effect of the present utility model is that by controlling different spacings formed between the tooth groups of the blade and the center line of the connection structure, after the moving blade is assembled with the connection structure as the reference, two different cutting spacings can be formed between the two side tooth groups in the moving blade and the respective stationary blade teeth on both sides of the stationary blade. Among them, the tooth group with a larger cutting spacing can cut long hairs short, while the tooth group with a smaller cutting spacing can perform secondary trimming on short hairs, improving the trimming effect of the hairs. There is no need for additional auxiliary tools (such as a scraper, etc.), reducing the user's cost of using tools. Moreover, a single moving blade can achieve two different trimming effects, expanding the scope of use of the moving blade. Description of the Drawings

[0021] Figure 1 Front view of the moving blade with asymmetric blade teeth according to an embodiment of the present utility model

[0022] Figure 2 Side view of the moving blade with asymmetric blade teeth according to an embodiment of the present utility model

[0023] Figure 3 Stereo structure diagram of the moving blade with asymmetric blade teeth according to an embodiment of the present utility model

[0024] Figure 4 Stereo structure diagram of the blade assembly according to an embodiment of the present utility model

[0025] Figure 5 Bottom view of the blade assembly according to an embodiment of the present utility model

[0026] Figure 5a For Figure 5 Enlarged view at P in

[0027] Figure 5b For Figure 5 Enlarged view at position K in

[0028] Figure 6 For Figure 5 Cross-sectional structure diagram at A-A in

[0029] Figure 7 For Figure 5 Cross-sectional structure diagram at B-B in

[0030] Figure 8 Front view of the stationary blade in the embodiment of the present utility model

[0031] Figure 8a Side view of the stationary blade in the embodiment of the present utility model

[0032] Figure 8b Side view of the second embodiment of the stationary blade in the embodiment of the present utility model

[0033] Figure 8c Side view of the third embodiment of the stationary blade in the embodiment of the present utility model

[0034] Figure 9 Three-dimensional structure diagram of the power component in the embodiment of the present utility model

[0035] Figure 10 Three-dimensional structure diagram of the stationary blade seat in the embodiment of the present utility model

[0036] Figure 11 Three-dimensional exploded view of the blade assembly in the embodiment of the present utility model Specific implementation manner

[0037] The following further describes the embodiments of the present utility model in conjunction with the attached Figures 1 to 11 :

[0038] The moving blade 1 of the present utility model for forming asymmetric cutter teeth includes a substrate 11, and cutter tooth groups 12 are respectively arranged at both side edges of the substrate 11. Each cutter tooth group 12 includes a plurality of moving cutter teeth 13 arranged side by side at intervals, and a hair inlet groove 14 is formed between adjacent moving cutter teeth 13; a connecting structure 15 for limiting connection with the power component 3 is arranged on the substrate 11. The limiting connection means that the substrate 11 will not have lateral or longitudinal displacement relative to the power component 3, but can be separated from the power component 3 axially. The substrate 11 moves synchronously with the power component 3. The synchronous movement means that when the power component 3 reciprocates under the drive of the drive source, the substrate 11 will synchronously follow the power component 3 to reciprocate, realizing hair trimming. Since the cutter tooth groups 12 on both sides of the existing moving blade 1 are symmetrically arranged, the user's usage requirements cannot be met. Therefore, the present application provides the following solutions:

[0039] Taking the center line of the connecting structure 15 as a reference, the two cutter tooth groups 12 are asymmetrically arranged on both side edges of the substrate 11 at different intervals. By controlling the different intervals formed between the cutter tooth group 12 and the center line of the connecting structure 15, when the moving cutter 1 is assembled with the connecting structure 15 as a reference, the two cutter tooth groups 12 on both sides of the moving cutter 1 can form two different cutting intervals with the ends of each stationary cutter tooth 21 on both sides of the stationary cutter 2. Among them, the cutter tooth group 12 with a larger cutting interval can be used to cut long hair short, while the cutter tooth group 12 with a smaller cutting interval can perform secondary trimming on short hair, minimizing the remaining length of the hair roots on the skin surface. The precise trimming effect can be achieved without additional auxiliary tools (such as a scraper), reducing the user's cost of using hair trimming tools, thereby improving the hair trimming effect. Moreover, the two cutter tooth groups 12 on both sides of the moving cutter 1 can be used to achieve two different trimming effects, expanding the application range of the moving cutter 1.

[0040] To improve the hair trimming effect and usage safety, the lengths and shapes of the moving cutter teeth 13 in the two cutter tooth groups 12 are set to be the same and / or different, preferably the lengths and shapes of the moving cutter teeth 13 in the two cutter tooth groups 12 are different. The use of different shapes is mainly considered because the intervals between the ends of the moving cutter teeth 13 in the two cutter tooth groups 12 and the skin are different. This interval can also be understood as the distance between the outer end faces of the cutter tooth group 12 and the outer ends of each stationary cutter tooth 21 in the stationary cutter 2. When the interval is relatively large, the moving cutter tooth 13 can be selected with an ordinary conventional cutter tooth shape as long as it can achieve hair trimming. When the interval is relatively small, the end of the moving cutter tooth 13 is very likely to directly contact the skin and cut the skin during reciprocating oscillation. Therefore, a structure for protecting the skin by preventing skin cuts needs to be added at the tips of the moving cutter teeth 13 in this cutter tooth group 12 to improve usage safety. The use of different lengths is mainly considered for the purpose of precise trimming. Since the lengths of the stationary cutter teeth 21 in the stationary cutter 2 are the same, to reduce the interval between the ends of the cutter tooth group 12 and the ends of the stationary cutter teeth 21, the optimal solution is to increase the length of the moving cutter teeth 13 on one side of the two sides of the substrate 11. Of course, the reverse design can also be adopted, and the length of the corresponding stationary cutter teeth 21 on the stationary cutter 2 that cooperate to cut the hair can be correspondingly shortened to achieve the same purpose.

[0041] To facilitate the trimming performance of the moving blade 1 and facilitate the assembly and disassembly of the moving blade 1, the limiting connection between the connecting structure 15 and the power component 3 is an axial hole mating structure or a groove-rail mating structure. Since the assembly and disassembly of the moving blade 1 and the power component 3 are in the axial direction, to prevent the moving blade 1 from displacing relative to the power component 3 in the transverse and longitudinal directions, which may affect the hair trimming performance and trimming effect of the moving blade 1, the connecting structure 15 is an axial hole mating structure, that is, a positioning shaft or a positioning hole is respectively provided on the substrate 11 of the moving blade 1 and the power component 3 to achieve the limiting connection between the moving blade 1 and the power component 3. Of course, a groove-rail method can also be adopted. For example, a concave sliding groove is provided on the substrate 11 of the moving blade 1, and a structure similar to a track is provided on the power component 3, and the structure similar to the track is placed in the sliding groove, so that the synchronous linkage between the moving blade 1 and the power component 3 can also be achieved. The specific structure adopted is not limited in this embodiment, as long as it can meet the transverse and longitudinal limits and the axially detachable limiting connection.

[0042] In actual production, the cutter tooth group 12 includes a short tooth group 121 and a long tooth group 122. The moving cutter teeth 13 include short teeth 131 and long teeth 132. A plurality of short teeth 131 arranged side by side at intervals and the hair inlet groove 14 constitute the short tooth group 121; a plurality of long teeth 132 arranged side by side at intervals and the hair inlet groove 14 constitute the long tooth group 122; wherein, the length H1 of the short teeth 131 is less than the length H2 of the long teeth 132. During use, each short tooth 131 of the short tooth group 121 is used to slide along the skin to cut the long hair, and then, each long tooth 132 in the long tooth group 122 is used to finely trim the short hair, maximizing the shortening of the length of the hair roots remaining on the skin surface and improving the hair trimming effect.

[0043] Since the distance between the tips of the long teeth 132 of the long tooth group 122 and the tips of the stationary cutter teeth 21 in the stationary blade 2 is relatively small, and the skin has a certain elasticity, when the stationary blade 2 slides along the skin, it is very easy for the local skin to be sunken. In this way, the blade assembly will sink into the sunken part of the skin. When the moving blade 1 swings back and forth along the stationary blade 2 driven by the power component 3, the tips of the long teeth 132 are very likely to cut the skin. To this end, to improve the safety of use, the short teeth 131 and the long teeth 132 are arranged in different shapes. Specifically, at the tip end of the long teeth 132, there is a protruding point with a width greater than the tip, an outer end face in an arc shape, and a smooth transition (for this tooth shape, please refer to the Chinese invention patent application filed by the applicant in 2022, publication number CN1526478A). During use, the arc-shaped outer end face of the tooth convex can not only prevent the long teeth 132 from cutting the skin, but also facilitate the sliding when the long teeth 132 contact the skin. Of course, for the purpose of protecting the skin and improving the safety of use, both the short teeth 131 and the long teeth 132 can adopt the above tooth shape. However, since the distance between the end of the short teeth 131 and the end of the stationary cutter teeth 21 in the stationary blade 2 is relatively large, it avoids the short teeth 131 from contacting the skin during hair trimming. Therefore, the short teeth 131 adopt straight teeth that are easy to produce and process.

[0044] Since the length H2 of each long tooth 132 in the long tooth group 122 is greater than the length H1 of each short tooth 131 in the short tooth group 121, with the position of the connecting structure 15 unchanged, taking the center line of the connecting structure 15 as a reference, a first spacing L1 is formed between the outer side surface of the short tooth 131 and the center line, and a second spacing L2 is formed between the outer side surface of the long tooth 132 and the center line; among them, the second spacing L2 will necessarily be greater than the first spacing L1, so that the long tooth group 122 and the short tooth group 121 are asymmetrically arranged at the edges on both sides of the substrate 11. When in use, each short tooth 131 in the short tooth group 121 is mainly used to cut long hair short, and the required shearing force will be greater than that of the long teeth 132 in the long tooth group 122. Especially when there are more long hairs entering the hair inlet groove 14 at one time, the resistance formed is greater, and accordingly, the required shearing force of each short tooth 131 in the short tooth group 121 is greater. Therefore, by controlling the distance between each short tooth 131 in the short tooth group 121 and the connecting structure 15, the shearing force of each short tooth 131 can be improved, and the hair trimming efficiency and trimming performance of the short tooth group 121 can be ensured. And each long tooth 132 in the long tooth group 122 is mainly used to trim short hair. Affected by the hair length, short hair is very easy to escape during trimming. Therefore, the required shearing force of each long tooth 132 in the long tooth group 122 is relatively small, and increasing the length of each long tooth 132 in the long tooth group 122 has a smaller impact on hair trimming. Therefore, setting the second spacing L2 greater than the first spacing L1 is the preferred implementation mode of this embodiment.

[0045] To reduce the frictional resistance when the moving blade 1 swings back and forth, lower the surface temperature rise of the moving blade 1 and the stationary blade 2, and improve the use comfort, the short tooth group 121 and the long tooth group 122 are respectively bent relative to the substrate 11, so that a height difference is formed between the cutting working surface 133 in the short tooth group 121 and the long tooth group 122 and the surface of the substrate 11, and an air flow channel 134 is formed when the cutting working surface 133 contacts the mating blade. Bending the short tooth group 121 and the long tooth group 122 to form a height difference between the cutting working surface 133 in the long tooth group 122 and the short tooth group 121 and the surface of the substrate 11 not only greatly reduces the contact area and frictional resistance between the moving blade 1 and the stationary blade 2, lowers the surface temperature rise of the moving blade 1 or the stationary blade 2, and improves the use comfort of the blade assembly. At the same time, it can also form an air flow channel 134 between the surface of the substrate 11 of the moving blade 1 and the surface of the stationary blade 2, accelerate the air flow, and improve the heat dissipation performance of the moving blade 1 and the stationary blade 2.

[0046] Based on the above-mentioned moving blade 1, the applicant also proposes a technical solution for a cutter head assembly, which includes the above-mentioned moving blade 1 with asymmetric cutter teeth and the cooperating stationary blade 2. On the opposite sides of the stationary blade 2, stationary cutter teeth 21 are symmetrically formed. Each short tooth 131 of the short tooth group 121 in the moving blade 1 is in contact with one of the stationary cutter teeth 21 on both sides of the stationary blade 2, and a third spacing L3 is formed between the outer side of the end of each short tooth 131 and the outer side of the end of the stationary cutter tooth 21; the outer side surface of the end of each long tooth 132 of the long tooth group 122 in the moving blade 1 is in contact with the stationary cutter tooth 21 on the other side of the stationary blade 2, and a fourth spacing L4 is formed between the outer side of the end of each long tooth 132 and the outer side of the end of the stationary cutter tooth 21; wherein, the third spacing L3 is greater than the fourth spacing L4, the numerical range of the third spacing L3 is: 0.8 - 1.5 mm, preferably 1.0 mm, and the numerical range of the fourth spacing L4 is: 0 - 0.5 mm, preferably 0.2 mm. During trimming, not only can the use safety be improved to prevent the skin from being cut; at the same time, the fourth spacing L4 between the long teeth 132 and the stationary cutter teeth 21 can be controlled to effectively ensure the trimming effect of the hair.

[0047] Taking the shaving of body hair on the calf of the human body as an example, there are two conventional shaving processes. One is to directly use a manual scraper (such as the common Gillette manual razor on the market) to directly slide along the skin to trim the hair. Although this method has a good shaving effect, it is not easy to master and is extremely easy to cut the skin, there are certain potential safety hazards in use. In response to this, the solution proposed in this application is to first cut short the leg hair through the short tooth group 121 in the moving blade 1, so that the length of the leg hair roots (commonly known as stubble) is less than 1.5 mm; then, the leg hair roots are finely trimmed through the long tooth group 122 in the moving blade 1. Since the distance between the end of each long tooth 132 in the long tooth group 122 and the end of each stationary cutter tooth 21 in the stationary blade 2 is relatively small, which is 0.2 mm, the length of the leg hair roots is basically less than 0.2 mm after the secondary trimming, which is basically invisible to the naked eye and there will be no obvious tactile sensation, thus meeting the needs of people with relatively thick body hair, especially women.

[0048] The above hair trimming method only takes body hair as an example, which does not mean that the blade assembly cannot be applied to the trimming of hair such as beards and hair. Secondly, the above hair trimming process is mainly aimed at people with relatively thick body hair. And some people have relatively sparse body hair. When shaving body hair, the long tooth group 122 of the moving blade 1 can be directly used for trimming, which can be specifically selected according to actual needs.

[0049] During the hair trimming process, the moving blade 1 reciprocates along the stationary blade 2 driven by the power component 3. To prevent the distances between the short teeth 131 and long teeth 132 and the stationary blade teeth 21 from changing during the reciprocating movement and affecting the hair trimming effect, a guiding groove 22 is provided at the center of the surface of the stationary blade 2 opposite to the moving blade 1. The connecting structure 15 in the moving blade 1 is at least one through hole penetrating the substrate 11. The power component 3 is pressed on the moving blade 1 and a limiting post 31 is provided at the corresponding position. The limiting post 31 is inserted into the through hole and its end is placed in the guiding groove 22 to form a guiding and limiting fit. By providing the guiding groove 22 on the stationary blade 2 and inserting a part of the end of the limiting post 31 for the limiting connection between the power component 3 and the moving blade 1 into the guiding groove 22, the limiting post 31 can play a dual role, that is, while limiting the connection between the moving blade 1 and the power component 3, it can also cooperate with the guiding groove 22 to guide and limit the reciprocating movement of the moving blade 1, optimizing the assembly structure and effectively ensuring the precise trimming effect of the long tooth group 122 in the moving blade 1.

[0050] During the assembly of the conventional stationary blade 2, most often bolts are used to pass through the stationary blade 2 to connect it with the stationary blade seat 4, and the stationary blade seat 4 is used to connect the blade assembly with the fuselage. In this way, although the installation firmness of the stationary blade 2 can be ensured, one of the two surfaces of the stationary blade 2 will directly contact the skin. Affected by the bolts passing through the stationary blade 2, it not only affects the overall appearance of the blade assembly. Moreover, the ends of the bolts will cause adverse phenomena such as pulling hair and jamming hair, and even scratching the skin. In response, at least one counterbore 23 is respectively provided at the two ends of the edge of the mating surface between the stationary blade 2 and the moving blade 1. One end of the internal screw sleeve 24 is placed in the counterbore 23 and fixedly connected with the stationary blade 2 as a whole, and the other end protrudes from the surface of the stationary blade 2. The stationary blade seat 4 is covered above the stationary blade 2 and fixedly connected by bolts 25, and the power component 3 and the moving blade 1 are restricted between the stationary blade 2 and the stationary blade seat 4, so that the moving blade 1, the stationary blade 2, the power component 3 and the stationary blade seat 4 form a whole. By respectively providing counterbores 23 on the inner surfaces at both ends of the stationary blade 2 and inserting one end of the internal screw sleeve 24 into the counterbore 23 and bonding or welding it with the stationary blade 2 to form a whole with the stationary blade 2, when the stationary blade 2 is assembled, the bolts 25 will not pass through the stationary blade 2, ensuring the integrity of the surface of the stationary blade 2 in contact with the skin. While improving the overall aesthetics, it can also effectively prevent the heads of the bolts 25 from pulling hair, jamming hair or scratching the skin, ensuring the use comfort, safety and installation firmness of the stationary blade 2.

[0051] During the hair trimming process, the cutting working surfaces 133 of the short tooth group 121 and the long tooth group 122 in the moving cutter 1 need to be in contact with the end faces of the stationary cutter teeth 21 of the stationary cutter 2 to form a shearing force. The moving cutter 1 needs to reciprocally swing along the stationary cutter 2 under the drive of the power member 3 during the working process. To ensure the hair trimming performance of the moving cutter 1, an elastic member 5 is provided between the power member 3 and the stationary cutter seat 4 so that the short tooth group 121 and the long tooth group 122 of the moving cutter 1 always keep their end faces in contact with the stationary cutter teeth 21 on both sides of the stationary cutter 2 respectively. During the production and assembly process, the elastic member 5 is a spring. To ensure the trimming performance of the short tooth group 121 and the long tooth group 122, three springs are respectively provided below the short tooth group 121 and the long tooth group 122. In this way, when hair jams on one side of the short tooth group 121 or the long tooth group 122 during use, it will not affect the hair trimming performance of the other cutter tooth group 12. Secondly, the short tooth group 121 and the long tooth group 122 are respectively supported by three springs, which can ensure that the shearing forces in each area (i.e., left, middle, and right) of the short tooth group 121 and the long tooth group 122 always remain balanced, and the phenomenon of the cutter jumping due to insufficient elastic force will not occur. During the actual assembly process, one end of each spring is sleeved on the spring seat 44 provided in the stationary cutter seat 4, and the other end supports on the spring post 32 on the surface of the power member 3. Since the moving cutter 1 is limit-connected to the power member 3, when the spring supports the power member 3, it can effectively ensure that each short tooth 131 in the short tooth group 121 and each long tooth 132 in the long tooth group 122 in the moving cutter 1 always keep their end faces in contact with the stationary cutter teeth 21 in the stationary cutter 2, and can also always ensure that the moving cutter 1 and the power member 3 remain in a limit-connected state and will not be axially separated. Of course, springs may not be used. For example, using elastic sheets to support can achieve similar technical effects. However, since the production cost of elastic sheets is relatively high, using springs is the preferred implementation method.

[0052] During the hair trimming process, the stationary cutter 2 needs to slide along the skin surface. To facilitate the sliding trimming of the blade assembly, when viewed from the front projection of either end of the stationary cutter 2, at least part of the surface of the stationary cutter 2 in contact with the skin is inclined, so that the tip thickness of at least one side and / or both sides of the stationary cutter teeth 21 in the stationary cutter 2 is less than the root thickness; by locally setting at least one side of the surface of the stationary cutter 2 in contact with the skin to be inclined, not only can the tip thickness of the stationary cutter teeth 21 be reduced to control the length of the remaining hair roots on the skin surface; at the same time, the inclined surface of the stationary cutter 2 is more conducive to the stationary cutter 2 sliding along the skin, reducing the resistance of the skin surface to the sliding of the stationary cutter 2, thereby ensuring the smoothness during the hair trimming process.

[0053] When the surfaces on both sides of the substrate 11 in contact with the skin are locally inclined, the inclination angles on both sides of the surface of the stationary cutter 2 in contact with the skin can be set to be the same or different. If the inclination angles on both sides of the surface of the stationary cutter 2 in contact with the skin are the same, it means that the tip thicknesses of the stationary cutter teeth 21 on both sides of the stationary cutter 2 are also the same. When trimming hair with the surface of the stationary cutter 2 fitting the skin, the remaining root lengths of the hair on the skin surface are also the same. If the inclination angles on both sides of the surface of the stationary cutter 2 in contact with the skin are different, it means that the tip thicknesses of the stationary cutter teeth 21 on both sides of the surface of the stationary cutter 2 are different. When trimming hair with the surface of the stationary cutter 2 fitting the skin, two different remaining root lengths of hair will be formed, enabling a single blade assembly to produce two different hair trimming effects.

[0054] As Figures 8a - 8c shown, during the actual production process of the stationary cutter 2, a flat surface can be set on the surface of the stationary cutter 2, and inclined surfaces can be set on both sides of the flat surface to form the same or different inclination angles S1 and S2. Of course, the flat surface can also not be set, and directly with the center line of the stationary cutter 2 as the reference, it can be directly inclined towards both sides to form the same or different inclination angles S1 and S2. The specific setting can be determined according to user requirements and will not be further limited in this embodiment.

[0055] When the body hair length is greater than 3 mm, affected by the oil or sweat secreted by the skin surface, the body hair will more or less form a curly shape. To prevent the side wall of the stationary cutter holder 4 from blocking the curly hair and affecting the hair feeding efficiency, when viewed from the front projection of either end of the stationary cutter holder 4, the width of the stationary cutter holder 4 is smaller than the width of the stationary cutter 2. By reducing the width of the stationary cutter holder 4 and increasing the distance between the tip of each stationary cutter tooth 21 in the stationary cutter 2 and the side wall of the stationary cutter holder 4, the curly hair will not be blocked by the side wall of the stationary cutter holder 4 and can smoothly enter the hair feeding groove 14 between the stationary cutter teeth 21, improving the hair feeding efficiency.

[0056] To facilitate the mutual cooperation between the moving cutter 1 and the stationary cutter 2 for trimming hair, and to enable the moving cutter 1 and the stationary cutter 2 to form an integral body after assembly for the overall assembly and disassembly of the blade assembly and the fuselage, when viewed from the front projection of either side of the stationary cutter holder 4, limiting grooves 41 are provided on the two side walls of the stationary cutter holder 4. The short tooth group 121 and the long tooth group 122 in the moving cutter 1 respectively pass through the limiting grooves 41 and are placed outside the stationary cutter holder 4 to keep the end faces in contact with the corresponding stationary cutter teeth 21 in the stationary cutter 2. By providing the limiting grooves 41 on the two side walls of the stationary cutter holder 4, during assembly, the moving cutter 1 can be placed inside the stationary cutter holder 4, and its short tooth group 121 and long tooth group 122 on both sides can respectively pass through the limiting grooves 41 and be placed outside the stationary cutter holder 4 and keep in contact with the stationary cutter teeth 21 in the stationary cutter 2 under the elastic force of the elastic member 5 to form a shearing force, ensuring the hair trimming performance of the blade assembly. At the same time, the stationary cutter holder 4, the power member 3, the elastic member 5, the moving cutter 1, and the stationary cutter 2 can be combined to form an integral body, thus facilitating the assembly and disassembly of the blade assembly as a whole with the fuselage.

[0057] To prevent the phenomenon of hair skipping the blade when the moving blade 1 reciprocates and swings along the stationary blade 2, which may cause displacement of the short tooth group 121 and the long tooth group 122 on both sides of the moving blade 1 and affect the hair trimming effect; a fifth spacing L5 is formed between the surface of the base plate 11 in the moving blade 1 and the bottom surface of the limiting groove 41, and this fifth spacing L5 is smaller than the depth L6 of the end of the limiting post 31 inserted into the guiding groove 22. Since the fitting of the moving blade 1 and the stationary blade 2 is achieved by the elastic member 5 pressing against the power member 3, the elastic member 5 has a certain elastic force. During use, the elastic member 5 may have a situation of elastic contraction. If the elastic contraction stroke of the elastic member 5 is too large, for example, the contraction stroke is greater than the depth L6 of the power member 3 inserted into the guiding groove 22 in the stationary blade 2, at this time, it is very easy for the moving blade 1 to be misaligned or displaced, resulting in a change in the spacing between the short tooth group 121 and the long tooth group 122 in the moving blade 1 and the stationary blade teeth 21 in the stationary blade 2, thus failing to achieve the technical purpose of controlling the residual length of hair roots. Therefore, controlling the distance between the moving blade 1 and the bottom surface of the limiting groove 41, that is, making the fifth spacing L5 smaller than the depth of the limiting post inserted into the guiding groove 22 can effectively prevent the moving blade 1 from being misaligned or displaced relative to the stationary blade 2. This can not only ensure that the third spacing L3 and the fourth spacing L4 between the short tooth group 121 and the long tooth group 122 of the moving blade 1 and each stationary blade tooth 21 in the stationary blade 2 remain constant, ensuring the hair trimming effect; at the same time, in the cooperation between the limiting post 31 and the guiding groove 22, it can also ensure the stable operation of the moving blade 1 and the working stability of hair trimming.

[0058] When the blade assembly is in use, it needs to be assembled and disassembled with the body. For the convenience of the overall assembly and disassembly of the blade assembly, a protruding and annular mounting seat 42 is provided on the outer surface of the stationary knife holder 4, and a rotary clamping groove 43 for detachably fixing the stationary knife holder 4 to the body is provided at relative positions on the peripheral side wall of the mounting seat 42. By providing the mounting seat 42 on the stationary knife holder 4 and the rotary clamping groove 43 on the mounting seat 42, during assembly, the mounting seat 42 can be inserted into the body, and the blade assembly can be integrally connected and locked to the body by the cooperation of the tongue (not shown in the figure) provided in the body and the rotary clamping groove 43. Specifically, when the mounting seat 42 is inserted into the body, the tongue is in the active area 431 of the rotary clamping groove 43. Rotating the blade assembly so that the locking area 432 of the rotary clamping groove 43 cooperates with the tongue can achieve the firm connection of the blade assembly and the body. When the blade assembly needs to be disassembled, the blade assembly is rotated in the corresponding reverse direction so that the tongue can slide from the locking area 432 in the rotary clamping groove 43 to the active area 431 of the rotary clamping groove 43, and then the blade assembly can be withdrawn from the body to achieve the disassembly of the blade assembly and the body.

[0059] The above embodiments should not be regarded as limitations on the present invention, but any improvement based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. The moving knife with asymmetric cutter teeth includes a substrate (11), cutter tooth groups (12) are respectively arranged at the two side edges of the substrate (11), each cutter tooth group (12) includes a plurality of moving cutter teeth (13) arranged side by side at intervals, and a hair inlet groove (14) is formed between adjacent moving cutter teeth (13); characterized in that A connecting structure (15) for limit connection with a power member (3) is provided on a substrate (11). Taking the center line of the connecting structure (15) as a reference, two cutter tooth groups (12) are asymmetrically arranged at different intervals on both side edges of the substrate (11).

2. The moving blade for forming an asymmetric cutting tooth according to claim 1, wherein The lengths and shapes of the moving cutter teeth (13) in the two cutter tooth groups (12) are set to be the same and / or different.

3. The moving blade for forming an asymmetric cutter tooth according to claim 1, wherein The limit connection between the connecting structure (15) and the power member (3) is a shaft-hole fit structure or a groove-rail fit structure.

4. The moving blade for forming an asymmetric cutting tooth according to claim 1, characterized in that The cutter tooth group (12) includes a short tooth group (121) and a long tooth group (122). The moving cutter teeth (13) include short teeth (131) and long teeth (132). A plurality of short teeth (131) arranged side by side at intervals and the hair feeding groove (14) constitute the short tooth group (121); a plurality of long teeth (132) arranged side by side at intervals and the hair feeding groove (14) constitute the long tooth group (122); wherein, the length H1 of the short teeth (131) is less than the length H2 of the long teeth (132).

5. The moving blade forming an asymmetric cutter tooth according to claim 4, wherein Each of the short teeth (131) and the long teeth (132) is set to have a different shape.

6. The moving blade for forming an asymmetric cutter tooth according to claim 4, wherein Taking the center line of the connecting structure (15) as a reference, a first distance L1 is formed between the outer side surface of the short teeth (131) and the center line, and a second distance L2 is formed between the outer side surface of the long teeth (132) and the center line; wherein, the second interval L2 is greater than the first distance L1, so that the long tooth group (122) and the short tooth group (121) are asymmetrically arranged.

7. The moving blade for forming an asymmetric cutting tooth according to claim 4, wherein The short tooth group (121) and the long tooth group (122) are respectively bent with respect to the substrate (11), so that a height difference is formed between the cutting working surfaces (133) in the short tooth group (121) and the long tooth group (122) and the surface of the substrate (11), and an air flow channel (134) is formed when the cutting working surfaces (133) are in contact with the mating blades.

8. Blade assembly, characterized in that It includes a moving cutter (1) forming asymmetric cutter teeth described in any one of claims 1 to 7 and a stationary cutter (2) cooperating therewith. Stationary cutter teeth (21) are symmetrically formed on opposite sides of the stationary cutter (2). Each of the short teeth (131) in the short tooth group (121) of the moving cutter (1) is in contact with one of the stationary cutter teeth (21) on one side of the two sides of the stationary cutter (2), and a third distance L3 is formed between the outer side of the end of each short tooth (131) and the outer side of the end of the stationary cutter tooth (21); the outer side surface of the end of each long tooth (132) in the long tooth group (122) of the moving cutter (1) is in contact with the stationary cutter teeth (21) on the other side of the stationary cutter (2), and a fourth distance L4 is formed between the outer side of the end of each long tooth (132) and the outer side of the end of the stationary cutter tooth (21), wherein, the third distance L3 is greater than the fourth distance L4.

9. The blade assembly according to claim 8, wherein A guiding groove (22) is provided at the center of the surface of the stationary cutter (2) opposite to the moving cutter (1). The connecting structure (15) in the moving cutter (1) is at least one through hole penetrating the substrate (11). The power member (3) is pressed on the moving cutter (1) and a limiting post (31) is provided at a corresponding position. The limiting post (31) is inserted into the through hole (16) and its end is placed in the guiding groove (22) to form a guiding and limiting fit.

10. The blade assembly according to claim 8, wherein At least one counterbore (23) is provided at each of the two end edges of the mating surface between the stationary blade (2) and the moving blade (1). One end of the inner screw sleeve (24) is placed in the counterbore (23) and fixedly connected to the stationary blade (2) as a whole, and the other end protrudes from the surface of the stationary blade (2). The stationary blade seat (4) is covered above the stationary blade (2) and fixedly connected by bolts (25), and the power member (3) and the moving blade (1) are restricted between the stationary blade (2) and the stationary blade seat (4), so that the moving blade (1), the stationary blade (2), the power member (3) and the stationary blade seat (4) form a whole.

11. The blade assembly according to claim 10, wherein An elastic member (5) is provided between the power member (3) and the stationary blade seat (4) so that the short tooth group (121) and the long tooth group (122) of the moving blade (1) are always kept in end face contact with the stationary blade teeth (21) on both sides of the stationary blade (2).

12. The blade assembly according to claim 8, wherein When viewed from the front projection of any end of the stationary blade (2), at least a part of the surface of the stationary blade (2) in contact with the skin is inclined, so that the tip thickness of at least one side and / or both sides of the stationary blade teeth (21) of the stationary blade (2) is less than the root thickness; or, when both sides of the substrate are locally inclined, the inclination angles on both sides are set to be the same or different.

13. The blade assembly according to claim 10, characterized in that When viewed from the front projection of any end of the stationary blade seat (4), the width of the stationary blade seat (4) is smaller than the width of the stationary blade (2); when viewed from the front projection of any side of the stationary blade seat (4), limiting grooves (41) are provided on the two side walls of the stationary blade seat (4), and the short tooth group (121) and the long tooth group (122) in the moving blade (1) respectively pass through the limiting grooves (41) and are placed outside the stationary blade seat (4) to keep end face contact with the corresponding stationary blade teeth (21) in the stationary blade (2).

14. The blade assembly according to claim 13, wherein A fifth distance L5 is formed between the surface of the substrate (11) in the moving blade (1) and the bottom surface of the limiting groove (41), and the fifth distance L5 is smaller than the depth L6 of the end of the limiting post (31) inserted into the guiding groove (22).

15. The blade assembly according to claim 13, wherein A protruding and annular mounting seat (42) is provided on the outer surface of the stationary blade seat (4), and rotary clamping grooves (43) for detachably fixing the stationary blade seat (4) to the machine body are provided at opposite positions on the circumferential side wall of the mounting seat (42).

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