Pruning blade with protective teeth and tool bit assembly
By designing the cutting surface and teeth guard structure on the trimming blades of the hair trimming tool, the problem of difficult to control the remaining length of the skin and hair roots of fixed teeth is solved, and the purpose of improving the safety and effect of trimming is achieved.
Patent Information
- Application Number
- CN202421766846.1
- 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
In the fixed tooth set of existing hair trimming tools, the fixed tooth tip is relatively sharp, which is easy to stab the skin, posing a safety hazard. At the same time, it is difficult to effectively reduce the remaining length of the hair roots during scraping and scissing, affecting the trimming effect.
A trimming blade with teeth guard is designed. By setting the cutting surface on the trimming blade, the teeth guard naturally form the fixed teeth tip of the fixed teeth group. Combined with the inclined structure of the cutting surface and the substrate surface, it ensures that the thickness of the fixed teeth remains consistent from the tooth root to the tooth tip, improving the safety of use and trimming effect.
Effectively prevents the sting of the fixed tooth spikes from piercing the skin, improves the safety and comfort of trimming, while reducing the remaining length of the hair roots and improving the hair trimming effect.
Smart Images
Figure CN222818965U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hair trimming tool, in particular to a trimming scissors with teeth guards for trimming hair and a cutter head assembly comprising the 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 trimming blade and a blade head assembly with tooth guards. By changing the structure of the fixed teeth on the 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 guards, the hair feeding efficiency can be improved and the residual length of 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 trimming blade with tooth guards, comprising a base plate, a fixed tooth group is provided at the edge of one end of the base plate, the fixed tooth group comprises a plurality of fixed teeth arranged side by side and spaced along the edge of one end of the base plate, 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 base plate, 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 height of the cutting surface is less than the height of the substrate, and 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, the cutting surface is lower than the surface of the substrate and is inclined relative to the surface, but is parallel to the other surface of the substrate, so that the thickness of the fixed teeth in each fixed tooth group remains consistent from the tooth root to the tooth tip, and the upper edge of the cutting surface is spaced apart from the tooth tip of each fixed tooth to form guard teeth at the tooth tip, and each guard tooth extends in a different direction from the fixed teeth.
[0007] Preferably, the cutting surface is parallel to the skin-contacting surface, and the skin-contacting surface is formed on the substrate surface and is inclined relative to the substrate surface, so that the thickness of the fixed teeth in each fixed tooth group remains consistent from the tooth root to the tooth tip, and the fixed tooth thickness is greater than the tooth guard height.
[0008] Preferably, viewed from the orthographic projection direction of the substrate thickness, the upper edge of the cutting surface is spaced from the tooth tip of each fixed tooth so that the guard teeth are formed at the tooth tip of each fixed tooth, and the lower edge of the cutting surface is inclined toward the tooth root direction of the fixed tooth so that each guard tooth is inclined relative to the fixed tooth.
[0009] Preferably, viewed from the orthographic projection direction of the substrate thickness, 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.
[0010] Preferably, based on the cutting surface, the height of the tooth guard is less than or equal to half of the thickness of the substrate, and not less than 0.1 mm.
[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;
[0014] Alternatively, the outer guide arc surface and the inner guide arc surface extend toward the end of the guard tooth and gradually widen, 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 not less than 0.35 mm when viewed from the positive projection direction of the tooth tip of the fixed tooth. 2 .
[0017] On the basis of the above-mentioned trimming blade with tooth guards, the applicant also proposed a technical solution for a cutter head assembly, comprising any of the above-mentioned trimming blades with tooth guards and a movable knife that swings back and forth along the trimming blade with tooth guards, wherein the movable knife is provided with a movable tooth group consisting of a plurality of movable blade 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 top of the fixed tooth group, and from the direction of the orthographic projection of the substrate thickness, the distance between the tooth tip of each movable blade tooth in the movable tooth group and the extension line of the perpendicular line of the outermost point of the tooth guard is between 0.3 mm and 1.2 mm.
[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 tilted 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 naturally 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 fixed knife. Moreover, compared with the tooth guard formed by the traditional bending process, the metallographic structure of the tooth guard in this application has not been damaged or changed, and is integrated with the metallographic structure of the fixed tooth and the substrate. The tooth guard has higher strength and 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 fixed knife is increased, the hair trimming effect is improved, and the tooth guard can also be used to isolate the moving knife to prevent the moving knife teeth of the moving knife from directly contacting the skin, thereby improving the safety of the fixed knife.
[0022] 4. The cutting surface is inclined to the surface of the substrate and parallel to the other surface of the substrate, so that the thickness of the tooth tip of the fixed tooth can be kept consistent with the thickness of the tooth root. When the hair is cut by the passive knife at the opening of the fixed tooth groove or the bottom of the groove, the remaining length of the hair can be kept at a uniform length. Compared with the traditional tooth type in which the tooth root thickness is greater than the tooth tip thickness, the hair trimming effect is better and the trimming efficiency is higher, which avoids the barber from trimming repeatedly at one position and reduces the workload of the barber. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a front view of a trimmer blade with a tooth guard according to an embodiment of the utility model.
[0024] Figure 2 A three-dimensional view of a trimmer blade with a tooth guard according to an embodiment of the utility model
[0025] Figure 3 A cross-sectional view of a trimmer blade with teeth guard according to an embodiment of the utility model
[0026] Figure 3A for Figure 3 Enlarged view of P in the middle
[0027] Figure 3B This is an enlarged structural diagram of the first embodiment of the tooth guard in the embodiment of the utility model
[0028] Figure 3C This is an enlarged structural diagram of the second embodiment of the mouthguard in the embodiment of the utility model
[0029] Figure 4 for Figure 3 Sectional structure diagram at KK
[0030] Figure 5 This is the main structural diagram of the cutter head assembly of the utility model embodiment
[0031] Figure 6 This is a cross-sectional structural diagram of the cutter head assembly of the utility model embodiment DETAILED DESCRIPTION
[0032] The following is combined with Figures 1 to 6 The implementation mode of the utility model is further described as follows:
[0033] The utility model is a trimming blade with tooth guards. The trimming blade is a fixed blade in actual production or assembly. The "fixed blade" in the following records can be regarded as a "trimming blade with tooth guards", and the "trimming blade with tooth guards" can also be directly understood as a "fixed blade". Defining the trimming blade with tooth guards as a fixed blade does not mean that the technical solution disclosed in this embodiment can only be applied to the fixed blade. The technical solution disclosed in the embodiment can also be adopted on the movable blade 6 according to actual conditions or needs. The trimming blade with tooth guards includes a substrate 1. The substrate 1 is a sheet with a certain thickness and has two surfaces, namely, the upper surface of the substrate 1 and the lower surface of the substrate 1. A fixed tooth group 2 is provided at the end edge of one of the surfaces (i.e., the upper surface) of the substrate 1. The fixed tooth group 2 is composed of a plurality of fixed teeth 21 arranged side by side and spaced along one end edge of the substrate 1 and fixed tooth grooves 22 between adjacent fixed teeth 21.
[0034] 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 safety fixed knife and the fixed tooth group 2.
[0035] 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 upper 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.
[0036] 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 upper 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 upper 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 processing difficulty 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.
[0037] 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.
[0038] When the cutting surface 3 is formed by grinding along the local upper 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 of the cutting surface 3 (which can be regarded as the outer edge of the grinding wheel during the grinding operation) is spaced from the tooth tips of each fixed tooth 21 in the fixed tooth group 2, and the lower edge of the cutting surface 3 (which can be regarded as the inner edge of the grinding wheel during the grinding operation) 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 passive 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.
[0039] Secondly, if Figure 3 and Figure 3A As shown, from the orthographic projection of the thickness direction of the substrate 1, the cutting surface 3 is lower than the upper surface of the substrate 1 and is inclined relative to the upper surface, but is parallel to the other surface of the substrate 1, that is, parallel to the lower surface of the substrate 1. In actual production, the cutting surface 3 sinks along the upper surface of the substrate 1 and is inclined with respect to the upper surface of the substrate 1. The lower surface of the substrate 1 is partially inclined relative to the upper surface of the substrate 1 and is parallel to the cutting surface 3, so that the thickness T3 of the fixed teeth in each fixed tooth group 2 is consistent from the root to the tip of the tooth. When the thickness of the fixed teeth 21 is consistent, after the hair enters the fixed tooth groove 22, whether it is the hair at the notch of the fixed tooth groove 22 or the hair at the bottom of the fixed tooth groove 22, after being trimmed by the passive knife 6, the residual length of the hair can be kept consistent. Compared with the traditional tooth shape in which the root thickness is greater than the tip thickness, the hair trimming effect is better and the trimming efficiency is higher, avoiding the barber from trimming repeatedly at one position, reducing the workload of the barber.
[0040] In order to prevent the tooth tips of the fixed teeth 21 from piercing the skin, the upper edge of the cutting surface 3 is spaced from the tooth tips of each fixed tooth 21, so that the tooth tips of each fixed tooth 21 are naturally formed with a guard 4. The tooth tips of each fixed tooth 21 can be blunted by the guard 4, which can effectively prevent the fixed teeth 21 from piercing the skin when inserted into the hair clump, thereby improving the safety of use. Each guard 4 intersects with the tooth tip of the corresponding fixed tooth 21 but has a different extension direction from the fixed tooth 21, which means that the guard 4 extends in different directions relative to the fixed tooth 21, such as toward the top or bottom of the fixed tooth 21, or extends both above and below. The guard 4 is used to isolate the moving knife 6 to prevent the moving knife teeth 611 of the moving knife 6 from directly contacting the skin, thereby improving the safety of the fixed knife. Secondly, when the guard 4 faces the skin, the guard 4 can also play a role similar to a comb, stimulating the head nerves, accelerating the blood circulation and blood oxygen supply of the head skin, so that the user has a more comfortable skin feeling and improves the comfort of the fixed knife; the setting direction of the guard 4 can be determined according to the actual needs of the user.
[0041] In order to ensure the overall working strength of the trimming blade and facilitate insertion into the hair clump, the cutting surface 3 is parallel to the skin-contacting surface 5, and the skin-contacting surface 5 is formed on the lower surface of the substrate 1 and is inclined relative to the lower surface of the substrate 1. In actual production, the skin-contacting surface 5 is inclined along the lower surface of the substrate 1 toward the tooth tip direction of the fixed tooth 21 and is parallel to the cutting surface 3. By setting the skin-contacting surface 5 inclined relative to the lower surface of the substrate 1, and the shortest distance between the skin-contacting surface 5 and the cutting surface 3 is limited to not more than 0.6mm, preferably between 0.4mm and 0.5mm. By controlling the shortest distance between the cutting surface 3 and the skin-contacting surface 5, it can also be understood as the tooth thickness of the fixed tooth 21, so that after the hair is cut, the residual length of the hair root on the skin can be controlled to the greatest extent, and the hair trimming effect can be improved. Secondly, the inclined skin-contacting surface 5 can not only enable the fixed knife to quickly insert into the hair clump along the skin, improving the hair feeding efficiency; at the same time, the inclined skin-contacting surface 5 can also make the fixed knife slide more smoothly along the skin, improving the comfort of use during hair trimming.
[0042] In order to improve the working strength of the toothguard 4, the fixed tooth thickness T3 is greater than the toothguard height T4. Since the toothguard 4 is formed at the tooth tip of the fixed tooth 21 by grinding the local upper surface of the substrate 1, when the fixed tooth thickness T3 is greater than the toothguard height T4, the working strength of the toothguard 4 can be effectively improved, avoiding deformation of the tooth tip of the fixed tooth 21 when the toothguard 4 is subjected to force, thereby improving the hair trimming performance.
[0043] The cutting surface 3 is sunken along the upper surface of the substrate 1 and tilted toward the root direction of the fixed tooth 21, and is connected to the upper surface of the substrate 1 through a transition slope 31. When processing the cutting surface 3, only the thickness of the fixed tooth group 2 area will be reduced, and the thickness of other areas of the substrate 1 will not be reduced, thereby ensuring the overall working strength of the trimming blade. In the actual production process, the cutting surface 3 may also be set to be non-parallel to the skin-contacting surface 5. For example, the inclination angle of the upper edge or the lower edge of the cutting surface 3 is different from that of the skin-contacting surface 5, so that the thickness of the tooth tip of the fixed tooth 21 is greater than the thickness of the tooth root, or the thickness of the tooth tip of the fixed tooth 21 is less than the thickness of the tooth root. However, by adopting a parallel structure, the residual length of the hair entering the fixed tooth groove 22 can remain consistent after being trimmed, thereby improving the hair trimming effect. Therefore, the implementation of this embodiment is a preferred implementation.
[0044] like Figure 3A As shown, in order to prevent the tooth tips of the fixed teeth 21 from being too sharp and piercing the skin, the upper edge of the cutting surface 3 is spaced apart from the tooth tips 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 relative to the fixed tooth 21. When trimming hair, the user will insert the fixed knife into the hair clump. If the guard tooth 4 is vertical relative to the fixed tooth 21, the outer side of the guard tooth 4 will hinder the hair, delay the advancement of the fixed knife and even affect the user's comfort. Secondly, when the fixed knife exits the hair clump, the inner side of the guard tooth 4 will hook or pull the hair, causing pulling pain to the user. Therefore, in this embodiment, the guard tooth 4 is preferably inclined relative to the fixed tooth 21, and the inclination angle a of the guard tooth 4 relative to the fixed tooth 21 is: 90°>a≥150°. In actual production, the inclination angle of the guard tooth 4 relative to the fixed tooth 21 is 125°. 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.
[0045] 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 T5, 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 volume 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.
[0046] 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 T4 is less than or equal to half of the substrate thickness T5 and not less than 0.1 mm based on the cutting surface 3. Since the existing substrate thickness T5 is mostly above 2 mm, in this embodiment, in order to reduce production costs, the substrate thickness T5 is less than or equal to 0.8 mm. The cutting surface 3 is formed on the local upper surface of the substrate 1 and is sunken, and is inclined toward the root end of the fixed tooth 21, so that the tip thickness of the fixed tooth 21 is consistent with the root thickness. Under the condition of ensuring the working strength of the fixed tooth 21, the thinner the fixed tooth thickness T3, the shorter the residual hair root length, and the better the hair trimming effect. Therefore, the hair trimming effect and trimming performance of the trimming blade can be effectively improved. In order to prevent the guard 4 from blocking or interfering with the hair entering the fixed tooth groove 22, the guard height T4 is preferably ≤0.5 mm, but ≥0.2 mm. In actual production, the height T4 of the tooth guard is 0.3 mm, and the cross-sectional area of the tooth guard 4 is proportional to the height T4. When the height T4 of the tooth guard is higher, its cross-sectional area is larger, and the corresponding tooth guard 4 may have a blocking effect on the hair; conversely, the lower the height T4 of the tooth guard is, the smaller the cross-sectional area of the tooth guard 4 is, which can effectively reduce the blocking effect of the tooth guard 4 on the hair. 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 height T4 of the tooth guard is too high and the blocking effect on the hair is improved, thereby improving the hair feeding speed of the fixed knife and the hair trimming efficiency.
[0047] 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 T6 formed at the tip of each fixed tooth 21 matches the width of the tooth tip, and the opening width T7 of the fixed tooth groove 22 between adjacent fixed teeth 21 is greater than the width of the tooth tip. Under the above-mentioned condition of limiting the guard height T4, by controlling the guard width T6 to match the width of the tooth tip of the fixed tooth 21, and making the opening width T7 of the fixed tooth groove 22 greater than the width of the tooth tip, the blocking of the hair by the guard 4 can be reduced to the greatest extent, and increasing the opening width T7 of the fixed tooth groove 22 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.
[0048] 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.
[0049] 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.
[0050] 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 T8 of the end of the guard tooth 4 is less than or greater than the thickness T9 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.
[0051] 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 T8 of the end of the tooth guard 4 is smaller than the thickness T9 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 T9 of the connection between the tooth guard 4 and the fixed tooth 21 can be correspondingly increased, 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 T9 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 thickness T8 of the end 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 T8 of the end of the guard 4 is greater than the thickness T9 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.
[0052] 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 T5.
[0053] 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, and this is hereby explained.
[0054] like Figure 5-6 As shown, on the basis of the trimming blade with tooth guard, the applicant also proposes a technical solution of a cutter head assembly, including the trimming blade with tooth guard and a movable knife 6 that swings back and forth along the 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 fixed tooth group 2, and from the positive projection direction of the substrate thickness T5, the distance T10 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 tooth guard 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 blade head component vertical to the skin and directly use the fixed teeth 21 of the fixed blade to contact the skin. At this time, the distance between the movable blade teeth 611 of the movable blade 6 and the guard teeth 4 of the fixed blade directly determines the length of the hair roots remaining on the skin. By setting the distance between the tooth tip of the movable blade teeth 611 and the outermost point of the guard teeth 4 to be less than 0.8mm and greater than 0.5mm, the blade 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 6 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.
[0055] 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 trimmer blade with teeth, comprising a base plate (1), a fixed tooth group (2) being arranged at the edge of one end of the base plate (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 base plate (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 cutting surface height T2 is less than the substrate height T1, and the upper edge 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 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), the cutting surface (3) is lower than the surface of the substrate (1) and is inclined relative to the surface, but is parallel to the other surface of the substrate (1), so that the thickness T3 of the fixed teeth in each fixed tooth group (2) remains consistent from the tooth root to the tooth tip, and the upper edge of the cutting surface (3) is spaced from the tooth tip of each fixed tooth (21) to form a guard tooth (4) at the tooth tip, and each guard tooth (4) extends in a different direction from the fixed tooth (21).
2. The trimmer blade with teeth guard according to claim 1, characterized in that The cutting surface (3) is parallel to the skin contact surface (5), and the skin contact surface (5) is formed on the surface of the base sheet (1) and is inclined relative to the surface of the base sheet (1), so that the fixed tooth thickness T3 in each fixed tooth group (2) remains consistent from the tooth root to the tooth tip, and the fixed tooth thickness T3 is greater than the tooth guard height T4.
3. The trimmer blade with teeth guard according to claim 1, characterized in that Viewed from the orthographic projection direction of the substrate thickness T5, the upper edge of the cutting surface (3) is spaced from the tooth tip of each fixed tooth (21) so that the guard teeth (4) are formed at the tooth tip of each fixed tooth (21), and the lower edge of the cutting surface (3) is inclined toward the tooth root direction of the fixed tooth (21) so that each guard tooth (4) is inclined relative to the fixed tooth (21).
4. The trimmer blade with teeth guard according to claim 1, characterized in that Viewed from the orthographic projection direction of the substrate thickness T5, 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).
5. The trimmer blade with teeth guard according to claim 1, characterized in that Taking the cutting surface (3) as a reference, the tooth guard height T4 is less than or equal to half of the base sheet thickness T5, and is not less than 0.1 mm.
6. The trimmer blade with teeth guard according to claim 1, characterized in that Viewed from the orthographic projection direction of the substrate (1) surface, the tooth guard width T6 formed at the tooth tip of each fixed tooth (21) matches the tooth tip width, and the opening width T7 of the fixed tooth groove (22) between adjacent fixed teeth (21) is greater than the tooth tip width.
7. The trimmer blade with teeth guard according to claim 1, characterized in that Each tooth guard (4) is inclined relative to the cutting surface (3) toward the 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 on 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 guard tooth (4) and gradually narrow, so that the thickness T8 of the end of the guard tooth (4) is smaller than the thickness T9 of the connection between the guard tooth (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 T8 of the end of the guard tooth (4) is greater than the thickness T9 of the connection between the guard tooth (4) and the tooth tip of the fixed tooth (21).
8. The trimmer blade with teeth guard according to claim 1, characterized in that A sliding arc surface (43) is formed at the end of the outer guiding arc surface (42) and the inner guiding 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 T8 of the end of the guard tooth (4) is less than or greater than the thickness T9 of the connection between the guard tooth (4) and the fixed tooth (21).
9. The trimmer blade with teeth guard according to claim 1, characterized in that The maximum cross-section of each guard tooth (4) is not less than 0.35 mm 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 trimming blade with guard teeth as claimed in any one of claims 1 to 9 and a movable knife (6) which reciprocates along the trimming blade with guard teeth, 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 cutting surface height T2 and is covered on the top of the fixed tooth group (2), and the distance T10 between the tooth tip of each movable knife tooth (611) in the movable tooth group (61) and the extension line of the perpendicular line of the outermost point of the guard teeth (4) is between 0.3 mm and 1.2 mm as viewed from the orthographic projection direction of the substrate thickness T5.