Safe trimming blade and tool bit assembly
By designing the partially grinded cutting surface and teeth guard structure on the fixed knife of the hair trimming tool, the problem of sharp stabbing of the fixed knife tip in the skin is solved, reducing the difficulty of processing and friction resistance, and improving the safety of use and hair trimming effect.
Patent Information
- Application Number
- CN202421766454.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-24
AI Technical Summary
The fixed tooth tips of existing hair trimming tools are relatively sharp, which poses safety risks of skin stabbing. At the same time, it is difficult to process and has high friction resistance, which affects the comfort and efficiency of use.
A safety trimming blade is designed to form a cutting surface by partially grinding on the substrate, the length of the fixed teeth set is smaller than the width of the substrate, and a tooth guard is formed at the tip of the fixed teeth, controlling the tooth guard height and inclination angle to reduce friction and improve safety.
Effectively prevent the stabilizing tooth tip from piercing the skin, reducing processing difficulty and friction resistance, improving the safety and comfort of use, and improving hair trimming effect and hair insertion efficiency.
Smart Images
Figure CN222818964U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hair trimming tool, in particular to a safety trimming blade for trimming hair and a cutter head assembly comprising the safety trimming blade, and is mainly applied to the field of hair clippers or hair trimming tools. Background Art
[0002] The existing cutter head assembly for trimming hair, beards, etc. mainly includes a fixed cutter and a moving cutter that swings back and forth along the fixed cutter. The fixed cutter is provided with a fixed tooth group consisting of a plurality of fixed teeth and fixed tooth grooves arranged at intervals, and the moving cutter is provided with a corresponding moving tooth group that cooperates with the fixed tooth group to cut hair and consists of a plurality of moving cutter teeth and moving tooth grooves. During use, the fixed cutter is in direct contact with the skin, and the fixed teeth in the fixed cutter are mostly cut by a grinding wheel, and the tooth tips of the fixed teeth are relatively sharp and can easily pierce the skin, posing certain safety hazards. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a safety trimming blade and a blade head assembly. By changing the structure of the fixed teeth on the safety trimming blade, not only can the safety of use during hair trimming be guaranteed; at the same time, by controlling the height of the tooth guard, the hair feeding efficiency can be improved and the residual length of the hair roots can be reduced during shaving and cutting, thereby improving the hair trimming effect.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is a safe trimming blade, comprising a substrate, a fixed tooth group is provided at the edge of one end of the substrate, the fixed tooth group comprises a plurality of fixed teeth arranged side by side and spaced along the edge of one end of the substrate, and fixed tooth grooves are formed between adjacent fixed teeth; it is characterized in that the length of the fixed tooth group is less than the width of the substrate, wherein:
[0005] From the orthographic projection of the substrate surface, a cutting surface greater than the length of the fixed tooth group but equal to or less than the width of the substrate is provided at the fixed tooth group on the substrate, the upper edge of the cutting surface is spaced from the tooth tip of each fixed tooth in the fixed tooth group, and the lower edge of the cutting surface is at least flush with the bottom of the fixed tooth groove between adjacent fixed teeth or exceeds the bottom of the fixed tooth groove and is outside the bottom of the fixed tooth groove;
[0006] From the perspective of the orthographic projection in the thickness direction of the substrate, at least one side of the cutting surface is lower than the substrate surface so that a guard tooth is formed at the tooth tip of each fixed tooth in the fixed tooth group, and each guard tooth intersects with the corresponding tooth tip of the fixed tooth but has a different extension direction from the fixed tooth.
[0007] Preferably, when viewed from the direction of the thickness projection of the substrate, the lower edge of the cutting surface is connected to the surface of the substrate, and the upper edge of the cutting surface is inclined toward the tooth tip of the fixed tooth so that the root thickness of each fixed tooth is greater than the tooth tip thickness, and the upper edge of the cutting surface is spaced apart from the tooth tip of each fixed tooth, and each guard tooth is formed at the tooth tip of the corresponding fixed tooth and is inclined or perpendicular to the fixed tooth.
[0008] Preferably, when viewed from the thickness orthographic projection direction of the substrate, the highest point of each mouthguard is lower or higher than the substrate surface; or, the highest point of the mouthguard is on the same horizontal line as the substrate surface.
[0009] Preferably, based on the cutting surface, the height of the tooth guard is less than or equal to half the thickness of the substrate, and not less than 0.1 mm.
[0010] Preferably, a skin-contacting surface is formed on the base sheet and is arranged opposite to the cutting surface. The skin-contacting surface is inclined relative to the cutting surface, and the shortest distance between the cutting surface and the skin-contacting surface does not exceed 0.6 mm, so that the tip thickness of the fixed tooth is less than the root thickness, but greater than the tooth guard height.
[0011] Preferably, viewed from the orthographic projection direction of the substrate surface, the width of the guard teeth formed at the tooth tip of each fixed tooth matches the width of the tooth tip, and the opening width of the fixed tooth groove between adjacent fixed teeth is greater than the width of the tooth tip.
[0012] Preferably, each tooth guard is inclined toward the tip of the fixed tooth relative to the cutting surface, an inner guide arc surface is formed at the connection between the inner side surface of the tooth guard and the fixed tooth, an outer guide arc surface is formed on the outer side surface of the tooth guard, and the skin contact surface is tangently connected to the outer guide arc surface as a whole; wherein,
[0013] The outer guide arc surface and the inner guide arc surface extend toward the end of the mouthpiece and gradually narrow, so that the thickness of the end of the mouthpiece is smaller than the thickness of the connection between the mouthpiece and the fixed tooth; or,
[0014] The outer guide arc surface and the inner guide arc surface extend toward the end of the guard tooth and gradually become wider, so that the thickness of the end of the guard tooth is greater than the thickness of the connection between the guard tooth and the tooth tip of the fixed tooth.
[0015] Preferably, sliding arc surfaces are formed at the ends of the outer guide arc surface and the inner guide arc surface of each toothpick so that the end surface of each toothpick is arc-shaped, and the thickness of the end of the toothpick is less than or greater than the thickness of the connection between the toothpick and the fixed tooth.
[0016] Preferably, the maximum cross-section of each tooth guard is no greater than 0.35 mm when viewed from the orthographic projection direction of the tooth tip of the fixed tooth. 2 .
[0017] A cutter head assembly comprises the above-mentioned safety trimming blade and a movable knife that swings back and forth along the safety trimming blade, wherein the movable knife is provided with a movable tooth group consisting of a plurality of movable knife teeth and movable tooth grooves, the length of the movable tooth group is less than the height of the cutting surface and is covered on the top of the fixed tooth group, and from the thickness orthographic projection direction of the fixed knife, the distance between the tooth tip of each movable knife tooth in the movable tooth group and the extended line of the vertical line of the outermost point of the guard tooth is between 0.3mm and 1.2mm.
[0018] The beneficial effects of the utility model are:
[0019] 1. By grinding the partial surface of the substrate to form a cutting surface that matches the moving knife, compared with grinding the entire surface of the substrate, the processing workload is significantly reduced, reducing the production and processing costs, while also reducing the processing difficulty of the fixed knife, and improving the matching accuracy of the cutting surface and the moving knife. The flatness of the cutting surface can be controlled to a minimum of less than 0.02mm, which can reduce the friction resistance between the moving knife and the fixed knife, reduce the temperature rise between the moving knife and the fixed knife, and avoid the temperature rise of the fixed knife or the moving knife surface due to high friction resistance, which may cause the user's skin to feel scalded or even burn the skin, thereby improving the comfort of using the fixed knife.
[0020] 2. The cutting surface is inclined relative to the tip of the fixed tooth by grinding, and is spaced apart from the tip of the fixed tooth, so that a tooth guard is formed at the tip of the fixed tooth, which can effectively prevent the tip of the fixed tooth from stabbing or cutting the skin, and improve the safety and comfort of the use of the safety trimming blade. Moreover, compared with the tooth guard formed by the traditional bending process, the metallographic structure of the tooth guard in the present application has not been damaged or changed, and is integrated with the metallographic structure of the fixed tooth and the substrate. The strength of the tooth guard is higher and it is not easy to deform, which effectively improves the working stability of the tooth guard.
[0021] 3. The surface of the substrate is partially ground based on the thickness of the substrate to form a tooth guard. While reducing the obstruction of the tooth guard to the hair, the hair feeding amount of the trimming blade is increased, improving the hair trimming effect. At the same time, the tooth guard can also be used to isolate the moving knife to prevent the moving teeth of the moving knife from directly contacting the skin, thereby improving the safety of the use of the safety trimming blade. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a front view of the safety trimming blade according to the embodiment of the utility model
[0023] Figure 2 A three-dimensional diagram of a safety trimmer blade according to an embodiment of the utility model
[0024] Figure 3 A cross-sectional view of a safety trimming blade according to an embodiment of the utility model
[0025] Figure 3A for Figure 3 Enlarged view of P in the middle
[0026] Figure 3B This is an enlarged structural diagram of the first embodiment of the tooth guard in the embodiment of the utility model
[0027] Figure 3C This is an enlarged structural diagram of the second embodiment of the mouthguard in the embodiment of the utility model
[0028] Figure 4A-1 This is a schematic diagram of the first grinding embodiment of the cutting surface in the embodiment of the utility model
[0029] Figure 4A-2 This is a schematic diagram of the first grinding embodiment of the skin-contacting surface in the embodiment of the utility model
[0030] Figure 4A-3 The molding diagram of the tooth guard in the embodiment of the utility model
[0031] Figure 4B-1 This is a schematic diagram of the second grinding embodiment of the cutting surface in the embodiment of the utility model
[0032] Figure 4B-2 This is a schematic diagram of the second grinding embodiment of the skin-contacting surface in the embodiment of the utility model
[0033] Figure 5 for Figure 3 Sectional structure diagram at KK
[0034] Figure 6 This is the main structural diagram of the cutter head assembly of the utility model embodiment
[0035] Figure 7 This is a cross-sectional structural diagram of the cutter head assembly of the utility model embodiment DETAILED DESCRIPTION
[0036] The following is combined with Figures 1 to 7 The implementation mode of the utility model is further described as follows:
[0037] like Figure 1 As shown in Figures 4 to 5, the utility model is a safety trimming blade, which is a fixed blade in actual production or assembly. In the following records, "fixed blade" can be understood as "safety trimming blade", and "safety trimming blade" can also be directly understood as "fixed blade". Defining the safety trimming blade as a fixed blade does not mean that the technical solution disclosed in this embodiment can only be applied to a fixed blade. The technical solution disclosed in the embodiment can also be used on a moving blade according to actual conditions or needs. The safety trimming blade includes a substrate 1, which is a sheet of material with a certain thickness and has two surfaces. A fixed tooth group 2 is provided at the end edge of one of the surfaces of the substrate 1. The fixed tooth group 2 is composed of a plurality of fixed teeth 21 arranged side by side and spaced apart along one end edge of the substrate 1 and fixed tooth grooves 22 between adjacent fixed teeth 21.
[0038] In order to improve the working strength of the fixed tooth group 2, the length of the fixed tooth group 2 is smaller than the width of the substrate 1. By controlling the length of the fixed tooth group 2, the teeth 11 are strengthened between the two side edges of the substrate 1 and the fixed tooth group 2 to ensure the working strength and working stability of the fixed knife and the fixed tooth group 2.
[0039] When trimming hair, the movable knife 6 needs to swing back and forth along the fixed knife, and the movable tooth group 61 cooperates with the fixed tooth group 2 to cut the hair. It can be seen that the end surface flatness of the fixed tooth group 2 of the fixed knife and the movable tooth group 61 of the movable knife 6 is an important technical indicator in the production process. If the flatness is poor, when the movable tooth group 61 cooperates with the fixed tooth group 2, the friction resistance is relatively high, resulting in an increase in the temperature rise between the fixed knife and the movable knife 6, causing the user's skin to feel scorching or even burn the skin. Therefore, when the fixed knife is produced and processed, the entire surface of the substrate 1 needs to be ground so that when the movable knife 6 swings back and forth along the fixed knife, the friction resistance between the movable knife 6 and the fixed knife is reduced, and the temperature rise of the movable knife 6 and the fixed knife is reduced. However, since the fixed knife has a certain height, if the entire surface of the fixed knife is ground, not only the grinding workload is large, but the processing efficiency is low; moreover, after multiple grindings, the surface flatness of the fixed knife is difficult to guarantee, which invisibly increases the processing difficulty of the fixed knife.
[0040] In order to reduce the processing difficulty of the fixed knife, reduce the friction resistance and temperature rise between the fixed knife and the movable knife 6, and improve the safety and comfort of use, the technical solution adopted in this embodiment is: from the positive projection of the surface of the substrate 1, a cutting surface 3 greater than the length of the fixed tooth group 2 but equal to or less than the width of the substrate 1 is provided at the fixed tooth group 2 on the substrate 1. The cutting surface 3 is formed by local grinding along the surface of the substrate 1. In actual production, the cutting surface height T2 is less than the substrate height T1 but greater than the length of the movable knife tooth 611. Compared with the conventional processing along the entire surface of the substrate 1, by reducing the cutting surface height T2 (from the thickness direction of the substrate 1, it can also be understood as the width of the cutting surface 3), the flatness of the cutting surface 3 can be effectively improved, which is not only easy to produce and process, but also reduces the difficulty of processing and improves production efficiency; at the same time, it can also reduce the friction resistance of the movable knife 6 when it swings back and forth along the cutting surface 3, reduce the temperature rise between the movable knife 6 and the fixed knife, and avoid the surface temperature of the fixed knife or the movable knife 6 due to the high friction resistance. Increase, which makes the user's skin feel scorching or even burns the skin, thereby improving the comfort of using the fixed knife.
[0041] When the cutting surface 3 is actually produced, both ends of the cutting surface 3 can completely penetrate the substrate 1, so that multiple substrates 1 can be processed uniformly to improve production efficiency. Of course, in order to improve the working strength of the fixed knife, one end of the cutting surface 3 can also penetrate the substrate 1, and the other end can be spaced from the edge of the substrate 1; or the two ends of the cutting surface 3 can be spaced from the two side edges of the substrate 1, and the space between the end of the cutting surface 3 and the edge of the substrate 1 can be used to improve the working strength of the fixed knife. However, this processing method can only realize the processing of a single fixed knife at a time, and the processing efficiency is relatively low. Therefore, in this embodiment, it is preferred that the two ends of the cutting surface 3 penetrate the two sides of the substrate 1 respectively.
[0042] When the cutting surface 3 is formed by grinding along the local surface of the substrate 1, as shown in FIG. Figure 1As shown, from the orthographic projection of the surface of the substrate 1, the upper edge 31 of the cutting surface 3 (which can also be understood as the outer edge of the grinding wheel) is spaced apart from the tooth tips of each fixed tooth 21 in the fixed tooth group 2, and the lower edge 32 of the cutting surface 3 (which can also be understood as the inner edge of the grinding wheel) is at least flush with the bottom of the fixed tooth groove 22 between adjacent fixed teeth 21 or exceeds the bottom of the fixed tooth groove 22 and is outside the bottom of the fixed tooth groove 22. In this way, when the cutting surface 3 is processed and assembled with the movable knife 6, when the movable knife 6 swings back and forth along the fixed knife, the movable tooth group 61 can cover the remaining fixed teeth 21 and the fixed tooth groove 22 except the tooth tips of the fixed teeth 21, avoiding the direct contact of the tooth tips of the movable knife teeth 611 in the movable tooth group 61 with the skin, thereby improving the safety of use; and, it can also prevent hair from entering the bottom of the fixed tooth groove 22 and being unable to be cut by the movable knife teeth 611, thereby avoiding the occurrence of undesirable phenomena such as hair pulling and hair jamming, thereby improving the hair trimming performance and hair trimming stability of the fixed knife and the movable knife 6.
[0043] Secondly, if Figure 3 and Figure 3A As shown, from the orthographic projection in the thickness direction of the substrate 1, at least one side of the cutting surface 3 is lower than the surface of the substrate 1, so that the guard teeth 4 are formed at the tooth tips of each fixed tooth 21 in the fixed tooth group 2. By adjusting the spacing between the upper edge 31 of the cutting surface 3 (i.e., the side edge of the grinding wheel) and the tooth tips of the fixed teeth 21, and controlling the inclination angle between the surface of the substrate 1 and the grinding wheel, the guard teeth 4 can be formed at the tooth tips of each fixed tooth 21 in the fixed tooth group 2, which not only avoids the tooth tips of the fixed teeth 21 from stabbing the skin, but also reduces the processing difficulty of the fixed knife, improves the production efficiency and enhances the safety of the fixed knife; at the same time, when the movable knife 6 reciprocates along the cutting surface 3 of the fixed knife, the guard teeth 4 can also isolate the movable tooth group 61 of the movable knife 6, preventing each movable knife tooth 611 in the movable tooth group 61 from directly contacting the skin and causing skin cuts, thereby ensuring the safety of the fixed knife and the cutter head assembly.
[0044] Each tooth guard 4 intersects with the tooth tip of the corresponding fixed tooth 21 but extends in a different direction from the fixed tooth 21, which means that the tooth guard 4 extends in different directions relative to the fixed tooth 21, such as extending above or below the fixed tooth 21, or extending above and below at the same time. The tooth guard 4 is used to isolate the movable knife 6 to prevent the movable knife teeth 611 of the movable knife 6 from directly contacting the skin, thereby improving the safety of the fixed knife. Moreover, when the tooth guard 4 faces the skin, the tooth guard 4 can also play a role similar to that of a comb, stimulating the head nerves, accelerating the blood circulation and blood oxygen supply of the head skin, thereby making the user feel more comfortable and improving the comfort of the fixed knife. The setting direction of the tooth guard 4 can be determined according to the actual needs of the user, and this is not further limited in this embodiment.
[0045] like Figure 3AAs shown, from the direction of the orthographic projection of the substrate thickness T4, the lower edge 32 of the cutting surface 3 is connected to the surface of the substrate 1, and the upper edge 31 of the cutting surface 3 is inclined toward the tooth tip of the fixed tooth 21 so that the root thickness of each fixed tooth 21 is greater than the tooth tip thickness T3. By making the cutting surface 3 inclined relative to the surface of the substrate 1, the tooth tip thickness T3 of the fixed tooth 21 can be made smaller than the tooth root thickness, which ensures the working strength of the fixed tooth 21 and shortens the hair trimming effect at the tooth tip of the fixed tooth 21, that is, the thinner the tooth tip thickness T3 of the fixed tooth 21, the shorter the residual length of the hair root. In order to prevent the tooth tip of the fixed tooth 21 from being too sharp and piercing the skin, the upper edge of the cutting surface 3 is spaced apart from the tooth tip of each fixed tooth 21, and each guard 4 is formed at the tooth tip of the corresponding fixed tooth 21 and is inclined or perpendicular to the fixed tooth 21. When trimming hair, the user will insert the fixed knife into the hair clump. If the tooth guard 4 is perpendicular to the fixed teeth 21, the outer side of the tooth guard 4 will hinder the hair, delay the advancement of the fixed knife and even affect the user's comfort. Secondly, when the fixed knife withdraws from the hair clump, the inner side of the tooth guard 4 will hook or pull the hair, causing pulling pain to the user. Therefore, in this embodiment, the tooth guard 4 is preferably inclined relative to the fixed teeth 21, and the inclination angle a of the tooth guard 4 relative to the fixed teeth 21 is: 90°>a≥150°. In actual production, the inclination angle of the tooth guard 4 relative to the fixed teeth 21 is 110°. By limiting the inclination angle between the guard teeth 4 and the fixed teeth 21, the outer side and the inner side of the guard teeth 4 will form a slope relative to each other. When the fixed blade is inserted into the hair clump, the inner and outer sides of the guard teeth 4 will guide the hair. When advancing forward, the hair can be separated faster than the fixed teeth 21, and the hair can enter the fixed tooth groove 22 faster, thereby improving the hair feeding efficiency and hair trimming performance. When the fixed blade exits the hair clump, the inner side of the guard teeth 4 can avoid the phenomenon of hair stuck and hair pulled, thereby improving the comfort of using the fixed blade.
[0046] In order to reduce the difficulty of production and processing of the fixed knife, from the perspective of the orthographic projection direction of the substrate thickness T4, the highest point of each tooth guard 4 is lower or higher than the surface of the substrate 1. If the highest point of the tooth guard 4 is higher than the surface of the substrate 1, the surface of the substrate 1 needs to be ground as a whole during production and processing, and the processing amount is large, which is not the optimal production solution. If the highest point of the tooth guard 4 is lower than the surface of the substrate 1, the edge of the surface of the substrate 1 needs to be preliminarily ground to reduce the thickness. This relatively increases the production process of the fixed knife, and the production cost will also increase accordingly. Therefore, the highest point of the tooth guard 4 is on the same horizontal line as the basic surface, which is the optimal implementation scheme. In this way, the edge of the substrate 1 can be directly ground with a grinding wheel to form a cutting surface 3, and then cut to form fixed teeth 21 and fixed tooth grooves 22. The production process is simpler, the production efficiency is higher, and the production cost of the fixed knife can be effectively reduced.
[0047] In order to prevent the guard 4 from blocking the hair from entering the fixed tooth groove 22 and to improve the safety of the fixed tooth 21, the guard height T5 is less than or equal to half of the substrate thickness T4, and not less than 0.1 mm, based on the cutting surface 3. Since the existing substrate thickness T4 is mostly above 2 mm, in this embodiment, in order to reduce production costs, the substrate thickness T4 is less than or equal to 0.8 mm. The cutting surface 3 is formed on the local surface of the substrate 1 and is inclined toward the tooth tip end of the fixed tooth 21, so that the root thickness of the fixed tooth 21 is greater than the tooth tip thickness T3. Therefore, when the substrate thickness T4 is reduced, it will not affect the working strength of the fixed tooth 21. Under the condition of ensuring the working strength of the fixed tooth 21, the material cost of the fixed knife can also be reduced. In order to improve the hair feeding efficiency of the fixed tooth groove 22, the tooth guard height T5 is preferably ≤0.5mm, but ≥0.2mm. In actual production, the tooth guard height T5 is 0.3mm. The cross-sectional area of the tooth guard 4 is proportional to the tooth guard height T5. When the tooth guard height T5 is higher, its cross-sectional area is larger, and the corresponding tooth guard 4 will have a blocking effect on the hair; conversely, the lower the tooth guard height T5, the smaller the cross-sectional area of the tooth guard 4, which can effectively reduce the blocking of the hair by the tooth guard 4. Therefore, under the premise of ensuring that the tooth guard 4 can play a protective role on the skin, it is avoided to the greatest extent that the tooth guard height T5 is too high to block the hair, thereby improving the hair feeding speed of the fixed knife and the hair trimming efficiency.
[0048] In order to improve the comfort of the fixed knife and the hair trimming effect, a skin-contacting surface 5 is formed on the base sheet 1 and is arranged relative to the cutting surface 3. The skin-contacting surface 5 is inclined relative to the cutting surface 3, and the shortest distance between the cutting surface 3 and the skin-contacting surface 5 does not exceed 0.6 mm, so that the tip thickness T3 of the fixed tooth 21 is less than the root thickness, but greater than the tooth guard height T5. By setting the skin-contacting surface 5 inclined relative to the cutting surface 3, with its inclination direction toward the tip of the fixed tooth 21, the tip thickness T3 of the fixed tooth 21 can be further reduced to be less than the root thickness of the fixed tooth 21, and the shortest distance between the cutting surface 3 and the skin-contacting surface 5 in the fixed tooth 21 is not more than 0.6 mm, preferably between 0.4 mm and 0.5 mm. When the skin-contacting surface 5 is inserted into the hair clump in contact with the skin, the movable knife 6 that swings back and forth along the cutting surface 3 can control the remaining length of the hair root to the greatest extent, thereby improving the hair trimming effect. Secondly, the inclined skin-contacting surface 5 can not only enable the fixed blade to be quickly inserted into the hair clump along the skin, thereby improving the hair insertion efficiency; at the same time, the inclined skin-contacting surface 5 can also enable the fixed blade to slide more freely on the head, thereby improving the user comfort during hair trimming.
[0049] In order to improve the working strength of the toothguard 4, the shortest distance between the cutting surface 3 and the skin-contacting surface 5 is greater than the toothguard height T5, wherein the shortest distance between the cutting surface 3 and the skin-contacting surface 5 means that, viewed from the thickness direction of the substrate 1, the tooth tip thickness T3 of the fixed tooth 21 is greater than the toothguard height T5; since the toothguard 4 is formed at the tooth tip of the fixed tooth 21 by grinding the local surface of the substrate 1, when the tooth tip thickness T3 of the fixed tooth 21 is greater than the toothguard height T5, the working strength of the toothguard 4 can be effectively improved, and deformation of the tooth tip of the fixed tooth 21 when the toothguard 4 is subjected to force can be avoided, thereby improving the hair trimming performance.
[0050] In order to improve the hair feeding efficiency and reduce the blocking of the guard 4 to the hair, from the perspective of the orthographic projection direction of the surface of the substrate 1, the guard width T9 formed at the tip of each fixed tooth 21 matches the width of the tooth tip, and the opening width of the fixed tooth groove 22 between adjacent fixed teeth 21 is greater than the width of the tooth tip. Under the condition of limiting the guard height T5 as mentioned above, by controlling the guard width T9 to match the width of the tooth tip of the fixed tooth 21, and making the fixed tooth groove opening width T10 greater than the tooth tip width, the blocking of the hair by the guard 4 can be reduced to the greatest extent, and increasing the fixed tooth groove opening width T10 can make it easier to introduce hair, thereby increasing the hair feeding amount of the fixed knife and improving the hair trimming effect. Of course, in the actual production process, one or both sides of the guard teeth 4 can also be made to exceed the side wall of the fixed teeth 21. Although this structure will relatively increase the blocking of the guard teeth 4 on the hair and reduce the amount of hair entering, the guard teeth 4 can slow down the speed of hair sliding out of the fixed tooth groove 22 by exceeding the side wall of the fixed teeth 21 on one or both sides, blocking or delaying the hair entering the fixed tooth groove 22 from sliding out, buying time for the swing cutting of the movable knife 6, and relatively improving the hair trimming effect. However, with this structure, the production and processing of the fixed tooth groove 22 is difficult to a certain extent, so the implementation of this embodiment is the preferred implementation.
[0051] Since the above definition states that the tooth guard 4 is inclined relative to the fixed teeth 21, in order to avoid the phenomenon of hair pulling or hair jamming at the connection between the tooth tips of the tooth guard 4 and the fixed teeth 21, an inner guide arc surface 41 is formed at the connection between the inner side surface of the tooth guard 4 and the fixed teeth 21. The inner guide arc surface 41 is formed by grinding the grinding wheel along the local surface of the substrate 1. By providing the inner guide arc surface 41, no matter whether the fixed knife is contacting the skin with the skin-contacting surface 5 to insert into the hair clump, or the other end relative to the skin-contacting surface 5 to contact the skin to insert into the hair clump, the inner guide arc surface 41 can play a guiding and sliding role, preventing the phenomenon of hair pulling or hair jamming, and improving the comfort of use of the fixed knife; and, when the fixed knife exits the hair clump, the inner guide arc surface 41 can also guide the hair to exit quickly, preventing the tooth guard 4 from hooking the hair, and improving the convenience and comfort of use of the fixed knife.
[0052] When trimming hair, the fixed knife needs to be inserted into the hair clump. In order to prevent the joint between the tooth guard 4 and the fixed teeth 21 from interfering with the advancement of the fixed knife, an outer guide arc surface 42 is formed on the outer side of the tooth guard 4. The outer guide arc surface 42 is formed by grinding along the local surface of the substrate 1 at one time, and is tangentially connected to the skin-contacting surface 5 as a whole. In actual production, the arc radius of the outer guide arc surface 42 is greater than or equal to 0.5 mm. By limiting the outer guide arc surface 42 of the tooth guard 4 to a radius of not less than 0.5 mm, when the fixed knife is advanced along the skin, the outer guide arc surface 42 of the tooth guard 4 can speed up the advancement of the fixed knife, making the advancement process smoother; secondly, it can also prevent the outer side of the tooth guard 4 from causing punctures or cuts to the skin, thereby improving the safety of the fixed knife.
[0053] During the hair trimming process, especially when cutting hair, the barber will choose different grips to hold the haircutting tool to trim the hair according to the different hair growth locations. For example, when trimming the temporal area above the ears on both sides of the head and the back of the neck, the barber will basically make the haircutting tool perpendicular to the skin, that is, use the outer end surface of the fixed teeth 21 of the fixed knife to contact the skin and scrape up and down to trim the hair. In order to prevent the fixed knife from cutting the skin when scraping up and down along the skin perpendicular to the skin, a sliding arc surface 43 is formed at the end of the outer guide arc surface 42 and the inner guide arc surface 41 of each guard tooth 4 so that the end surface of each guard tooth 4 is arc-shaped, and the thickness of the end of the guard tooth 4 is less than or greater than the thickness of the connection between the guard tooth 4 and the fixed tooth 21. By forming an arc-shaped sliding arc surface 43 at the tooth end of the mouthguard 4, no matter which side of the mouthguard 4 faces the skin, the sliding arc surface 43 can make the mouthguard 4 slide along the skin more smoothly, so that the fixed knife can trim the hair more smoothly when it is perpendicular to the skin, thereby improving the comfort and safety of using the fixed knife and effectively preventing the fixed knife from stabbing or cutting the skin.
[0054] In order to improve the working strength of the tooth guard 4, the outer guide arc surface 42 and the inner guide arc surface 41 of the tooth guard 4 extend toward the end of the tooth guard 4 and gradually narrow, so that the thickness T6 of the end of the tooth guard 4 is smaller than the thickness T7 of the connection between the tooth guard 4 and the fixed tooth 21. By controlling the outer guide arc surface 42 and the inner guide arc surface 41 of the tooth guard 4 to gradually narrow along the end of the tooth guard 4, the thickness T7 of the connection between the tooth guard 4 and the fixed tooth 21 can be increased accordingly, so that the end and root of the tooth guard 4 (that is, the connection between the tooth guard 4 and the tooth tip of the fixed tooth 21) form different thicknesses. When the tooth guard 4 contacts the skin and is subjected to force, the increase in the thickness T7 of the connection between it and the fixed tooth 21 can effectively improve the working strength of the tooth guard 4, prevent the tooth guard 4 from deformation, and thereby improve the working stability of the tooth guard 4. Secondly, the end thickness T6 of the guard 4 becomes narrower, and when the fixed knife is inserted into the hair clump, it can also play the role of pre-lifting the hair, increase the amount of hair that the fixed knife feeds at one time, reduce the user (i.e., the barber) The repeated operation at one position reduces the workload and improves the efficiency of hair trimming. When the fixed knife shaves in the reverse direction, the guard 4 can directly contact the skin. The narrower guard 4 can also play a role similar to the combing teeth of a comb, stimulate the head nerves, accelerate the blood circulation and blood oxygen supply of the head skin, so that the user has a more comfortable skin feel and improves the comfort of using the fixed knife. Of course, the outer guide arc surface 42 and the inner guide arc surface 41 can also extend toward the end of the guard 4 and gradually widen, so that the thickness of the end of the guard 4 is greater than the thickness of the connection between the guard 4 and the tooth tip of the fixed tooth 21, but it is more difficult to make the guard 4 gradually widen. Therefore, the embodiment of this embodiment is a preferred embodiment.
[0055] In order to minimize the obstruction of the tooth guard 4 to the hair, increase the amount of hair entering the fixed tooth groove 22, and improve the hair trimming efficiency, the maximum cross-sectional area of each tooth guard 4 is not greater than 0.35mm from the positive projection direction of the tooth tip of the fixed tooth 21. 2 , but smaller than the cross-sectional area between the tooth width of the fixed tooth 21 and the substrate thickness T4.
[0056] Two molding processes of the mouthguard 4 are provided in this application:
[0057] Embodiment 1: As shown in 4A-1 to 4A-3, a customized grinding wheel is first used to grind a local surface of the substrate 1 to form an inclined cutting surface 3, and the cutting surface 3 is spaced apart from the tooth tips of the fixed teeth 21, so that the tooth tips of each fixed tooth 21 form a tooth guard 4; then, the customized grinding wheel is used to grind the other surface of the substrate 1 to form an inclined skin-contacting surface 5, and finally the end of the tooth guard 4 is chamfered and passivated to complete the molding of the tooth guard 4. The structure of the grinding wheel for this molding process is relatively simple, and most companies can simply modify the existing grinding wheel, but a separate chamfering and passivation process is required.
[0058] Embodiment 2: Figure 4B-1 to 4B-2As shown, the customized grinding wheel can form the cutting surface 3 and the tooth guard 4 at one time, and then use the second set of customized grinding wheels to form the skin-contacting surface 5 and the outer guide arc surface 42. The structure of the grinding wheel in this molding process is relatively complex, but it is impossible to chamfer and passivate the tooth guard 4 alone. Compared with Example 1, it can reduce the processing steps, but the disadvantage is that the customization of the grinding wheel is relatively complex.
[0059] It can be seen from the above two embodiments that the tooth guard 4 in the present application is produced along with the formation of the cutting surface 3. Compared with the tooth guard 4 formed by the traditional bending process, the metallographic structure of the tooth guard 4 is integrated with the metallographic structure of the fixed tooth 21 and the substrate 1, and the overall strength of the tooth guard 4 is higher and not easy to deform; and, the use of a customized grinding wheel can form the cutting surface 3 and the tooth guard 4 more quickly, and can ensure product consistency during mass production, which is also impossible to achieve and realize when forming the tooth guard 4 by the bending process.
[0060] like Figure 5-6 As shown, on the basis of the above-mentioned safety trimming blade, the applicant also proposes a technical solution of a cutter head assembly, including the above-mentioned safety trimming blade and a movable knife 6 that swings back and forth along the safety trimming blade, wherein the movable knife 6 is provided with a movable tooth group 61 composed of a plurality of movable knife teeth 611 and movable tooth grooves 612, the length of the movable tooth group 61 is less than the cutting surface height T2 and is covered on the top of the fixed tooth group 2, and from the positive projection direction of the substrate thickness T4, the distance T8 between the tooth tip of each movable knife tooth 611 in the movable tooth group 61 and the vertical extension line of the outermost point of the guard tooth 4 is between 0.3mm and 1.2mm, preferably less than 0.8mm and greater than 0.5mm. When the barber needs to trim the back of the ears on both sides of the user's head or the back of the neck, the cutter head cannot fit the skin well for trimming due to the body curve at the ears or the back of the neck. To this end, the barber will make the cutter head component perpendicular to the skin and directly use the fixed teeth 21 of the safety trimming blade to contact the skin. At this time, the distance between the moving cutter teeth 611 of the moving cutter 6 and the guard teeth 4 of the safety trimming blade directly determines the length of the hair roots remaining on the skin. By setting the distance between the tooth tip of the moving cutter teeth 611 and the outermost point of the guard teeth 4 to be less than 0.8mm and greater than 0.5mm, the cutter head assembly can form a fine cut. After the trimming is completed, there is no need to use a manual razor (also called a scraper, which is the most common manual blade for fine trimming along the skin surface in a barber shop) for secondary fine trimming, thereby avoiding consumer disputes caused by cutting the skin due to improper operation.
[0061] The above embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the protection scope of the present invention.
Claims
1. A safety trimming blade, comprising a substrate (1), a fixed tooth group (2) being arranged at the edge of one end of the substrate (1), the fixed tooth group (2) comprising a plurality of fixed teeth (21) arranged side by side and spaced apart along the edge of one end of the substrate (1), and a fixed tooth groove (22) being formed between adjacent fixed teeth (21); characterized in that The length of the fixed tooth group (2) is smaller than the width of the substrate (1), wherein: From the orthographic projection of the surface of the substrate (1), a cutting surface (3) greater than the length of the fixed tooth group (2) but equal to or less than the width of the substrate (1) is provided on the substrate (1) at the fixed tooth group (2), the upper edge (31) of the cutting surface (3) is spaced from the tooth tip of each fixed tooth (21) in the fixed tooth group (2), and the lower edge (32) of the cutting surface (3) is at least flush with the bottom of the fixed tooth groove (22) between adjacent fixed teeth (21) or exceeds the bottom of the fixed tooth groove (22) and is located outside the bottom of the fixed tooth groove (22); When viewed from the orthographic projection in the thickness direction of the substrate (1), at least one side of the cutting surface (3) is lower than the surface of the substrate (1), so that a guard tooth (4) is formed at the tooth tip of each fixed tooth (21) in the fixed tooth group (2), and each guard tooth (4) intersects with the tooth tip of the corresponding fixed tooth (21) but extends in a different direction from the fixed tooth (21).
2. The safety trimmer blade according to claim 1, characterized in that When viewed from the thickness orthographic projection direction of the substrate (1), the lower edge (32) of the cutting surface (3) is connected to the surface of the substrate (1), and the upper edge (31) of the cutting surface (3) is inclined toward the tooth tip direction of the fixed tooth (21) so that the tooth root thickness of each fixed tooth (21) is greater than the tooth tip thickness (T3), and the upper edge of the cutting surface (3) is spaced from the tooth tip of each fixed tooth (21), and each guard tooth (4) is formed at the tooth tip of the corresponding fixed tooth (21) and is inclined or perpendicular to the fixed tooth (21).
3. The safety trimmer blade according to claim 1, characterized in that Viewed from the thickness orthographic projection direction of the substrate (1), the highest point of each tooth guard (4) is lower or higher than the surface of the substrate (1); or, the highest point of the tooth guard (4) is on the same horizontal line as the surface of the substrate (1).
4. The safety trimmer blade according to claim 1, characterized in that Taking the cutting surface (3) as a reference, the tooth guard height (T5) is less than or equal to half of the base sheet thickness (T4) and is not less than 0.1 mm.
5. The safety trimmer blade according to claim 1, characterized in that A skin-contacting surface (5) is also formed on the base sheet (1) and is arranged opposite to the cutting surface (3). The skin-contacting surface (5) is inclined relative to the cutting surface (3). The shortest distance between the cutting surface (3) and the skin-contacting surface (5) does not exceed 0.6 mm, so that the tip thickness (T3) of the fixed tooth (21) is smaller than the root thickness but larger than the tooth guard height (T5).
6. The safety trimmer blade according to claim 1, characterized in that Viewed from the orthographic projection direction of the substrate (1) surface, the guard tooth width (T9) formed at the tooth tip of each fixed tooth (21) matches the width of the tooth tip, and the fixed tooth groove opening width (T10) between adjacent fixed teeth (21) is greater than the width of the tooth tip.
7. The safety trimmer blade according to claim 1, characterized in that Each tooth guard (4) is inclined relative to the cutting surface (3) toward the tooth tip of the fixed tooth (21); an inner guide arc surface (41) is formed at the connection between the inner side surface of the tooth guard (4) and the fixed tooth (21); an outer guide arc surface (42) is formed at the outer side surface of the tooth guard (4); and the skin contact surface (5) is tangentially connected to the outer guide arc surface (42) as a whole; wherein the outer guide arc surface (42) and the inner guide arc surface (41) extend toward the end of the tooth guard (4) and gradually narrow, so that the thickness (T6) of the end of the tooth guard (4) is smaller than the thickness (T7) of the connection between the tooth guard (4) and the fixed tooth (21); Alternatively, the outer guide arc surface (42) and the inner guide arc surface (41) extend toward the end of the guard tooth (4) and gradually widen, so that the thickness (T6) of the end of the guard tooth (4) is greater than the thickness (T7) of the connection between the guard tooth (4) and the tooth tip of the fixed tooth (21).
8. The safety trimmer blade according to claim 7, characterized in that A sliding arc surface (43) is formed at the end of the outer guide arc surface (42) and the inner guide arc surface (41) of each guard tooth (4), so that the end surface of each guard tooth (4) is in an arc shape, and the thickness (T6) of the end of the guard tooth (4) is less than or greater than the thickness (T7) of the connection between the guard tooth (4) and the fixed tooth (21).
9. The safety trimmer blade according to claim 1, characterized in that The maximum cross-sectional area of each guard tooth (4) is not greater than 0.35 mm2 when viewed from the positive projection direction of the tooth tip of the fixed tooth (21). 2 .
10. A cutter head assembly, characterized in that The invention comprises a safety trimming blade as claimed in any one of claims 1 to 9 and a movable knife (6) which swings back and forth along the safety trimming blade, wherein the movable knife (6) is provided with a movable tooth group (61) consisting of a plurality of movable knife teeth (611) and movable tooth grooves (612), the length of the movable tooth group (61) is less than the height of the cutting surface (3) and is covered on the top of the fixed tooth group (2), and when viewed from the thickness orthographic projection direction of the substrate, the distance T8 between the tooth tip of each movable knife tooth (611) in the movable tooth group (61) and the extended line of the perpendicular line of the outermost point of the guard tooth (4) is between 0.3 mm and 1.2 mm.