Pruning blade with safe cutter teeth and cutter head assembly

Abstract

The invention relates to a trimming blade and cutting head assembly with safe cutter teeth, which is characterized in that each cutter tooth is respectively provided with a tooth surface contacted with the skin and a cutting surface matched with cutting, and protective teeth with passivated edges are formed at the tooth tip parts of at least part of the cutter teeth and protrude out of the tooth surfaces and / or the cutting surfaces of the cutter teeth; the outer end face, located in the extending direction of the cutter teeth, of each protective tooth is provided with a relieving tooth with the passivated edge, and the length and width of each relieving tooth are smaller than those of each protective tooth, so that the sectional area of each relieving tooth in the direction perpendicular to the cutting face is smaller than that of each protective tooth. The trimming blade has the beneficial effects that the relatively protruding protective teeth are arranged at the tooth tips of the cutter teeth, so that the skin is prevented from being punctured or scratched, and the use safety of the trimming blade is improved. Secondly, the shovel teeth are arranged on the protective teeth in the extending direction of the cutter teeth, when the protective teeth slide along the skin surface, the shovel teeth with the small sectional area can pick up or shovel the hair tightly attached to the skin surface, and the hair feeding benefit of the hair and the hair trimming effect of the trimming blade are effectively improved.

Description

Technical Field

[0001] The invention relates to a hair trimming device, and more particularly to a trimming blade with safety teeth and a cutter head assembly, which is mainly used in the field of personal care tools such as razors, hair clippers, and hair trimmers. Background Art

[0002] On July 18, 2022, the applicant applied for an invention patent entitled: A static blade and its manufacturing method, with publication number: CN115091512B. The invention patent discloses that tooth ridges are formed on the upper end face and / or lower end face of the tooth tip of the blade. When trimming hair, the tooth ridges are used to prevent the tooth tip of the blade from being too sharp and injuring the skin, thereby improving the safety of the blade.

[0003] Although tooth protrusions are provided at the tooth tips of the blade teeth to prevent puncture of the skin, the contact area between the tooth tips and the skin is correspondingly increased. The obstruction of the tooth protrusions reduces the hair feeding efficiency of the blade when in use, especially some hair close to the skin cannot enter the hair guide groove between adjacent teeth in the blade, affecting the hair trimming performance of the trimming blade. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a trimming blade and a blade head assembly with safety teeth. The trimming blade can not only protect the skin with the help of the guard teeth formed at the tip of the teeth to avoid the skin being stabbed by the teeth, thereby improving the safety of the blade; at the same time, the shovel teeth formed on the outside of the guard teeth can also be used to scoop or lift up the hair close to the skin, thereby improving the hair feeding efficiency and hair trimming performance of the blade when in use.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is a trimming blade with safety teeth, including a base plate, a plurality of spaced and parallel teeth are formed at the edge of at least one side of the base plate, and a shearing groove is formed between adjacent teeth; each tooth has a tooth surface in contact with the skin and a cutting surface for shearing, and at least a tooth tip with a blunted edge is formed at the tip of at least part of the teeth, and the tooth guard protrudes from the tooth surface and / or cutting surface of the tooth; a shovel tooth with a blunted edge is provided in the outer end surface of each tooth guard in the extending direction of the tooth, and the length and width of the shovel tooth are smaller than the length and width of the tooth guard, so that the cross-sectional area of ​​each tooth guard in the direction perpendicular to the cutting surface is smaller than the cross-sectional area of ​​the tooth guard.

[0006] Preferably, each shovel tooth extends outward along the outer end surface of the guard tooth, with an extension length L≤2 mm, and the extension direction is the same as and / or different from the extension direction of the knife teeth.

[0007] Preferably, the cross-sectional area of ​​the guard teeth is more than 1.2 times the cross-sectional area of ​​the shovel teeth.

[0008] Preferably, each shovel tooth and guard tooth is made of the same material as the blade tooth and is integrally formed; or, each shovel tooth and guard tooth is a non-metallic part and is integrally formed with the blade tooth of the metal part.

[0009] Preferably, the cross section of the shovel teeth is one of elliptical, dome-shaped trapezoidal, square, circular or irregular.

[0010] Preferably, viewed from the side of the blade tooth, the upper and lower ends of the shovel tooth protrude as a whole from the outer end surface of the guard tooth so that the shovel tooth has the same thickness with equal distances between the upper and lower ends; or, the lower end of the shovel tooth protrudes from the outer end surface of the guard tooth so that the cross-section of the shovel tooth is conical; or, the upper and lower ends of the shovel tooth are respectively connected to the outer end surface of the guard tooth, and the middle area protrudes along the outer end surface of the guard tooth to form a conical shape.

[0011] Preferably, each guard tooth is formed on the cutting surface of the blade tooth, and the shovel tooth is formed centrally on the outer end surface of each guard tooth so that the edges around the shovel tooth are spaced apart from the edges around the guard tooth; or, the shovel tooth is formed laterally centrally on the outer end surface of each guard tooth, and its bottom surface forms a coplanar surface with the bottom surface of the guard tooth and the tooth surface of the blade tooth.

[0012] Preferably, each guard tooth is formed on the tooth surface of the knife tooth, and the shovel tooth is formed centrally on the outer end surface of each guard tooth so that the edges around the shovel tooth are spaced apart from the edges around the guard tooth; or, the shovel tooth is formed transversely centrally on the outer end surface of each guard tooth, and its bottom surface is coplanar with the bottom surface of the guard tooth.

[0013] Preferably, guard teeth are formed on the cutting surface and tooth surface of each blade tooth, respectively, and a shovel tooth is formed centrally on the outer end surface of each guard tooth so that the edges around the shovel tooth are spaced apart from the edges around the guard tooth; or, a shovel tooth is formed transversely centrally on the outer end surface of the guard tooth on one side of the tooth surface, and its bottom surface is coplanar with the bottom surface of the guard tooth.

[0014] Based on the above-mentioned trimming blade with safety teeth, the applicant also proposes a technical solution for a cutter head assembly, which includes the above-mentioned trimming blade with safety teeth.

[0015] The beneficial effects of the present invention are:

[0016] 1. By providing relatively protruding tooth guards on one or both of the tooth surface and the cutting surface at the tip of each tooth, the tooth guards can protect the skin no matter which side of the blade the user operates faces the skin, thereby preventing the skin from being punctured or scratched, and improving the safety of the trimming blade.

[0017] 2. Since the guard teeth protrude from the tooth surface and / or cutting surface at the tip of the teeth, when the trimming blade is inserted into the hair clump, the guard teeth will first contact the skin, which relatively increases the contact area between the teeth and the skin. The increase in contact area significantly reduces the pressure on the skin surface than the tip of the teeth with a smaller cross-sectional area, reducing the pain caused by the skin and correspondingly improving the user's comfort.

[0018] 3. A shovel tooth with blunted edges is provided on the outer end surface of each tooth guard in the direction of extension of the blade teeth. The length and width of the shovel tooth are smaller than the length and width of the tooth guard, so that the cross-sectional area of ​​each shovel tooth in the direction perpendicular to the cutting surface is smaller than the cross-sectional area of ​​the tooth guard. When the tooth guard slides along the skin surface, the shovel tooth with a smaller cross-sectional area can lift or shovel the hair close to the skin surface, effectively improving the hair feeding efficiency and the hair trimming effect of the trimming blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional assembly structure diagram of a cutter head assembly according to an embodiment of the present invention

[0020] Figure 2 A front plan view of a trimming blade with safety teeth according to an embodiment of the present invention

[0021] Figure 3 A front plan view of a second embodiment of a trimmer blade with safety teeth according to an embodiment of the present invention

[0022] Figure 4 for Figure 2 Stereoscopic cross-section view at AA

[0023] Figure 5 for Figure 2 Stereoscopic cross-section view of the middle BB

[0024] Figure 6 for Figure 2 Plane section view at CC

[0025] Figure 7 for Figure 6 The enlarged structural diagram and front projection diagram of the first embodiment of the combination of the guard teeth and the shovel teeth at the middle P

[0026] Figure 8 The enlarged structural diagram and front projection diagram of the second embodiment of the combination of the tooth guard and the shovel tooth in the embodiment

[0027] Fig. 9 The enlarged structural diagram and front projection diagram of the third embodiment of the combination of the guard teeth and the shovel teeth in the embodiment are shown in FIG.

[0028] Fig.10 The enlarged structural diagram and front projection diagram of the fourth embodiment of the combination of the guard and the shovel teeth in the embodiment are shown in FIG.

[0029] Fig.11 The enlarged structural diagram and front projection diagram of the fifth embodiment of the combination of the guard teeth and the shovel teeth in the embodiment are shown in FIG.

[0030] Fig.12 The enlarged structural diagram and front projection diagram of the sixth embodiment of the combination of the guard and the shovel teeth in the embodiment are shown in FIG.

[0031] Fig.13 The enlarged structural diagram and front projection diagram of the seventh embodiment of the combination of the guard teeth and the shovel teeth in the embodiment are shown in FIG.

[0032] Fig.14 The enlarged structural diagram and front projection diagram of the eighth embodiment of the combination of the guard teeth and the shovel teeth in the embodiment are shown in FIG. DETAILED DESCRIPTION

[0033] The following is combined with Figures 1 to 14 The embodiments of the present invention are further described as follows:

[0034] The present invention is a trimming blade with safety teeth, which can be a stationary blade in a hair clipper, a razor or a hair shaver, and of course, can also be a moving blade 2. The following embodiments all take the stationary blade as an example, and the specific structure includes a substrate 1, a plurality of spaced and parallel teeth 11 are formed at at least one side edge of the substrate 1, and a shearing groove 12 is formed between adjacent teeth 11, and the hair to be cut enters the shearing groove 12 and is cut by the reciprocating motion of the stacked teeth 11.

[0035] In production, each blade tooth 11 has a tooth surface 111 in contact with the skin, and a cutting surface 112 for shearing with other blades (i.e., the moving blade 2). To prevent the tooth tip of the blade tooth 11 from piercing the skin, at least a guard tooth 13 with blunted edges is formed at the tip of at least some of the blade teeth 11. The guard tooth 13 protrudes from the tooth surface 111 and / or the cutting surface 112 of the blade tooth 11. The above-mentioned edge blunting refers to the rounding of the edges of each side of the guard tooth 13, which can not only prevent the edges of the guard tooth 13 from pushing or scratching the skin, but also make the blade slide along the skin more smoothly. By providing a relatively protruding guard tooth 13 on one or both of the two surfaces of the tooth surface 111 and the cutting surface 112 at the tooth tip of each blade tooth 11, no matter which surface of the trimming blade is touched to the skin by the user, the guard tooth 13 can protect the skin, prevent the skin from being pierced or scratched, and improve the safety of the trimming blade. In actual production, the tooth guard 13 is set on at least one of the tooth surface 111 or the cutting surface 112 at the tip of the tooth 11. Of course, the tooth guard 13 can also be set on the tooth surface 111 and the cutting surface 112 at the tip of each tooth 11 according to user needs.

[0036] Secondly, because the tooth guard 13 protrudes from the tooth surface 111 and / or cutting surface 112 at the tip of the tooth 11, when the trimming blade is inserted into the hair clump, the tooth guard 13 will first contact the skin, relatively increasing the contact area between the tooth 11 and the skin. The increase in the contact area makes the pressure on the skin surface significantly lighter than the tooth tip of the tooth 11 with a smaller cross-sectional area, reducing the pain caused by the skin and correspondingly improving the user's comfort. On the other hand, the protruding tooth guard 13 can also play a role similar to a comb when sliding along the skin surface, stimulating the skin nerves, accelerating the skin's blood circulation and blood oxygen supply, and making the user feel more comfortable when using it.

[0037] Since the guard teeth 13 are formed at the tip of each blade tooth 11, the contact area between the tip of each blade tooth 11 and the skin is increased, which will have a certain blocking effect on the hair, resulting in some hair being unable to enter the shearing groove 12, especially the hair close to the skin surface. In this regard, a shovel tooth 14 with blunted edges is provided on the outer end surface of each guard tooth 13 in the extension direction of the blade tooth 11. The length and width of the shovel tooth 14 are smaller than the length and width of the guard tooth 13, so that the cross-sectional area of ​​each shovel tooth 14 in the direction perpendicular to the cutting surface 112 is smaller than the cross-sectional area of ​​the guard tooth 13. When the cross-sectional area of ​​the shovel tooth 14 is set smaller than the cross-sectional area of ​​the guard tooth 13, when the guard tooth 13 slides along the skin surface, the shovel tooth 14 with a smaller cross-sectional area can pick up or shovel the hair close to the skin surface, effectively improving the hair feeding efficiency and the hair trimming effect of the trimming blade.

[0038] In order to ensure the hair picking or scraping effect of the shovel teeth 14, each shovel tooth 14 extends outward along the outer end surface of the guard tooth 13, and its extension length L is ≤ 2mm. The extension length L of the shovel teeth 14 is preferably ≤ 1mm. If the extension length L of the shovel teeth 14 is set to be larger, such as 5mm, when the shovel teeth 14 pierce the skin, although it will not pierce the skin, it will also cause a heavier sense of pressure on the skin, causing blood marks under the skin and causing discomfort to the user. By limiting the extension length of the shovel teeth 14 to less than or equal to 2mm, even if the shovel teeth 14 are completely inserted into the skin, they will be blocked by the outer end surface of the guard tooth 13, and the shovel teeth 14 will not cause a heavier sense of pressure on the skin, thereby ensuring the skin comfort of the shovel teeth 14 when picking or scraping hair.

[0039] In actual production, the extension direction of the shovel teeth 14 is the same as the extension direction of the blade teeth 11, that is, the shovel teeth 14 and the blade teeth 11 are on the same axis. When the user pushes the trimming blade to slide along the skin, the shovel teeth 14 can be in the forward direction of the blade teeth 11 to pick up or shovel the hair close to the skin surface, thereby improving the hair feeding and hair trimming efficiency.

[0040] In some embodiments, the extension direction of the shovel teeth 14 can also be set to be the same and / or different combination as the extension direction of the blade teeth 11, such as Figure 3As shown, the shovel teeth 14 at the tooth tips of adjacent teeth 11 can face the same direction, can face opposite directions, or can be used in any combination. For example, the number of teeth 11 is divided into three equal parts or more, the shovel teeth 14 in the middle area of ​​the teeth 11 have the same extension direction as the teeth 11, and the shovel teeth 14 in the teeth 11 on both sides extend obliquely toward the middle teeth 11, so that the picked up or scooped hair can be gathered toward the middle area of ​​the blade, thereby improving the hair feeding and trimming efficiency. Of course, the shovel teeth 14 in the teeth 11 on both sides can also be extended obliquely to each other, so that the hair picked up or scooped by the shovel teeth 14 can enter the shear groove 12 between adjacent teeth 11 nearby, thereby improving the hair feeding efficiency. However, since the production process or mold manufacturing of the inclined shovel teeth 14 is relatively more complicated, the extension direction of the shovel teeth 14 in this embodiment is preferably the same as the extension direction of the teeth 11.

[0041] In order to ensure the hair picking or scraping effect of the shovel teeth 14, the maximum cross-sectional area of ​​the tooth guard 13 is more than 1.2 times the maximum cross-sectional area of ​​the shovel teeth 14, preferably 1.5 times. If the multiple ratio is too large, such as 3 times or 5 times, the cross-sectional area of ​​the shovel teeth 14 will be relatively small when the sizes of the blade teeth 11 and the tooth guard 13 remain unchanged. When the shovel teeth 14 contact the skin to pick or scrape hair, they will exert a more concentrated pressure on the skin, causing a heavier sense of pressure on the skin, causing discomfort to the user. If the multiple ratio is too small, such as 0.5 times or 1 times, the cross-sectional area of ​​the shovel teeth 14 will be relatively large when the sizes of the blade teeth 11 and the tooth guard 13 remain unchanged, and they cannot better fit the skin to pick or scrape hair, which correspondingly reduces the hair picking or scraping effect of the shovel teeth 14. In actual production, the cross-sectional area of ​​the shovel teeth 14 is not greater than 0.5mm 2 , preferably 0.2 mm 2 ~0.35mm 2 At this time, not only can the shovel teeth 14 be used to pick up or shovel the hair that fits the skin along the skin surface, but also a heavy sense of pressure can be avoided when the shovel teeth 14 contact the skin, thereby improving the comfort of the trimming blade when in use.

[0042] To facilitate the processing and forming of the guard teeth 13 and the shovel teeth 14, each shovel tooth 14 and guard tooth 13 is made of the same material as the blade tooth 11 and is formed in one piece; the guard teeth 13 and the shovel teeth 14 are made of the same material as the blade tooth 11. During production, the blade tooth 11, guard teeth 13 and shovel teeth 14 can be formed in one piece through an integrated stamping process or a powder metallurgy process, which has higher production efficiency.

[0043] Based on the above one-piece molding, the present technical solution also proposes an embodiment of a split structure, such as Figure 7As shown by the dotted line, each shovel tooth 14 and tooth guard 13 is a non-metallic part and is integrally formed with the metal tooth 11. The so-called non-metallic part means that the tooth guard 13 and shovel tooth 14 are made of plastic with a certain flexibility, such as ABS, PA, PC, POM and PVC, while the trimming blade can be made of ceramic or metal materials that can form a cutting edge. After the tooth 11 is formed, the tooth guard 13 and shovel tooth 14 are covered on the tip of the tooth 11 through a secondary injection molding process. The tooth guard 13 and shovel tooth 14 are made of flexible plastic, which can not only play a protective and hair-shoveling role, but also play a heat-insulating role, avoiding the skin from being burned by the temperature rise caused by friction of the tooth 11, thereby improving the safety and comfort of the trimming blade.

[0044] Since the shovel teeth 14 only need to pick up or scoop up the hair close to the skin surface, there is no special requirement for the shape of the shovel teeth 14, as long as it is easy to produce and can ensure that the shovel teeth 14 slide smoothly along the skin. In actual production, the cross-section of the shovel teeth 14 can be selected from one or more combinations of elliptical, dome-shaped trapezoidal, square, circular or special shapes. Considering the production efficiency, the shovel teeth 14 in this embodiment are preferably elliptical. Of course, other shapes can also be selected, which can be determined according to user needs, and this embodiment does not make further restrictions.

[0045] To ensure the hair picking or hair shoveling effect of the shovel teeth 14 when sliding along the skin, Figures 7-8 As shown in 11 to 14, viewed from the side direction of the blade tooth 11, the upper and lower ends of the shovel tooth 14 protrude as a whole from the outer end surface of the guard tooth 13, so that the shovel tooth 14 has the same thickness with equal distances at the upper and lower ends; with this structure, when the shovel tooth 14 contacts the skin, it will not push the skin, so that the trimming blade slides more smoothly along the skin surface and the skin feel is better.

[0046] Of course, the upper end of the shovel tooth 14 can also be connected to the outer end surface of the guard tooth 13, and the lower end can protrude from the outer end surface of the guard tooth 13 so that the cross section of the shovel tooth 14 is conical, such as Fig. 9 As shown, with this structure, the shovel teeth 14 have a better effect of picking or shoveling hair, but when the trimming blade slides along the skin, the shovel teeth 14 will push the skin surface, and the sliding is relatively unsmooth, which correspondingly reduces the comfort of using the trimming blade.

[0047] In addition to the above two embodiments, the following Fig.10 In the structure shown, the upper and lower ends of the shovel teeth 14 are respectively connected to the outer end surfaces of the guard teeth 13, and the middle area thereof protrudes along the outer end surfaces of the guard teeth 13 to form a cone shape. This structure not only ensures the smoothness of the trimming blade when sliding along the skin, but also the hair picking or shoveling effect of the shovel teeth 14 is relatively better. However, due to the relatively complex structure, the molding difficulty is relatively high. Therefore, in actual production, the specific structure to be selected can be determined according to the existing production conditions or user needs, and no further restrictions are made in this embodiment.

[0048] Since the guard teeth 13 can be disposed on the cutting surface 112 and / or the tooth surface 111 of the blade teeth 11, the shovel teeth 14 can also be formed at different positions according to the different positions of the guard teeth 13, for example:

[0049] When the guard teeth 13 are formed on the cutting surface 112 of the blade teeth 11, the shovel teeth 14 can be centrally arranged along the outer end surface of the guard teeth 13, so that the edges around the shovel teeth 14 are spaced from the edges around the guard teeth 13. Figure 8 shown.

[0050] Of course, when the guard teeth 13 are formed on the cutting surface 112 of the blade teeth 11, the bottom surface of the scraping teeth 14 and the bottom surface of the guard teeth 13, as well as the tooth surface 111 of the blade teeth 11, form a coplanar surface. Figure 7 shown.

[0051] By forming the guard teeth 13 on the cutting surface 112 of the blade teeth 11, the tooth tips of the moving blade 2 that reciprocates along the cutting surface 112 can be isolated from contacting the skin, thereby preventing the moving blade 2 from scratching the skin when reciprocating along the trimming blade, thereby improving the safety of the trimming blade. Whether the shovel teeth 14 are arranged in the center along the outer end surface of the guard teeth 13 or are coplanar with the bottom surface of the guard teeth 13 can be determined according to actual needs. For example, when the trimming blades are combined to form a trimming head, if only the tooth surface 111 of the trimming blade can be used to contact the skin, the shovel teeth 14 can be selected to be coplanar with the bottom surface of the guard teeth 13, so that when the trimming blade contacts the skin, the shovel teeth 14 can also directly contact the skin and slide along the skin, which has a better effect of picking or shoveling hair. When the trimming blades are combined to form a trimming head, and both surfaces of the trimming blades (i.e., the cutting surface 112 and the tooth surface 111) can directly contact the skin, the scraping teeth 14 can be centrally arranged along the outer end surface of the guard teeth 13, so that no matter which surface of the trimming blade contacts the skin, the scraping teeth 14 can play a role in picking or scraping hair.

[0052] In addition to the above-mentioned embodiment of setting the guard teeth 13 on the cutting surface 112, the guard teeth 13 can also be set on the tooth surface 111 of the blade teeth 11, such as Fig.11 and 12 As shown, each guard tooth 13 is formed on the tooth surface 111 of the blade tooth 11. The guard teeth 13 are formed on the tooth surface 111, which relatively increases the interval between the cutting surface 112 and the skin surface, and the residual hair roots of the cut hair are relatively long. This structure is particularly suitable for use in hair clippers, especially when the hair clippers are used to cut short hair (i.e., short hair). The shovel teeth 14 are arranged in the center along the outer end surface of the guard teeth 13 so that the edges around the shovel teeth 14 are spaced from the edges around the guard teeth 13. When the barber places the trimming blade perpendicular to the scalp, the shovel teeth 14 can not only play a protective role to prevent the moving blade 2 from directly contacting the scalp and cutting the skin; at the same time, it can also play a role as a ruler to ensure that the length of the cut hair is consistent.

[0053] In addition, you can Fig.12 As shown, the shovel teeth 14 are formed laterally and centered on the outer end surface of each tooth guard 13, and the bottom surface thereof is coplanar with the bottom surface of the tooth guard 13. After being coplanar, the shovel teeth 14 can slide along the skin surface, and the smoothness of movement and the hair picking or shoveling effect are better than those of the centered setting.

[0054] like Figures 13-14 As shown, in order to improve the flexibility of use of the trimming blade, so that any side of the trimming blade can contact the skin and prevent the skin from being cut by the moving blade 2, a guard tooth 13 is formed on the cutting surface 112 and the tooth surface 111 of each tooth 11. By forming the guard tooth 13 on the tooth surface 111 and the cutting surface 112 of the tooth 11, such a trimming blade is particularly suitable for a razor for shaving body hair. During use, no matter which side of the trimming blade touches the skin, the guard tooth 13 can play a protective role to prevent the moving blade 2 from cutting the skin when it swings back and forth, thereby improving the safety of use.

[0055] After the guard teeth 13 are respectively arranged on the tooth surface 111 and the cutting surface 112 of the blade teeth 11, the scraping teeth 14 can be formed centrally on the outer end surface of each guard tooth 13 so that the edges around the scraping teeth 14 are spaced from the edges around the guard teeth 13; Fig.14 As shown, by arranging the scraping teeth 14 in the center, when any side of the trimming blade contacts the skin, the scraping teeth 14 can play a role in picking or scraping hair. Fig.14 As shown, the shovel teeth 14 are formed laterally and centrally on the outer end surface of the tooth guard 13 on one side of the tooth surface 111, and the bottom surface thereof is coplanar with the bottom surface of the tooth guard 13. After the shovel teeth 14 are coplanar with one of the tooth guards 13, when the opposite surface contacts the skin, the hair picking or shoveling effect of the shovel teeth 14 is relatively poor. However, when the coplanar side contacts the skin, the shovel teeth 14 are more suitable for picking up or shoveling hair growing in the skin folds (such as armpit hair). Therefore, where the shovel teeth 14 are set can be determined according to actual use, and this embodiment does not impose further restrictions.

[0056] Based on the above-mentioned trimming blade with safety teeth, the applicant also proposes a technical solution of a cutter head assembly, comprising at least one of the above-mentioned trimming blades with safety teeth.

[0057] The above embodiments should not be regarded as limiting the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A trimming blade with safety teeth, comprising a base sheet (1), a plurality of teeth (11) arranged side by side and spaced apart are formed on at least one edge of the base sheet (1), and a shearing groove (12) is formed between adjacent teeth (11); characterized in that Each blade tooth (11) has a tooth surface (111) in contact with the skin and a cutting surface (112) for shearing. A guard tooth (13) with blunted edges is formed at the tip of at least some of the blade teeth (11). The guard tooth (13) protrudes from the tooth surface (111) and / or the cutting surface (112) of the blade tooth (11). A shovel tooth (14) with blunted edges is provided on the outer end surface of each guard tooth (13) in the extending direction of the blade tooth (11). The length and width of the shovel tooth (14) are smaller than the length and width of the guard tooth (13), so that the cross-sectional area of ​​each shovel tooth (14) in a direction perpendicular to the cutting surface (112) is smaller than the cross-sectional area of ​​the guard tooth (13).

2. The trimming blade with safety teeth according to claim 1, characterized in that Each shovel tooth (14) extends outward along the outer end surface of the guard tooth (13), with an extension length L≤2 mm, and an extension direction that is the same as and / or different from an extension direction of the blade tooth (11).

3. The trimming blade with safety teeth according to claim 1, characterized in that The cross-sectional area of ​​the guard teeth (13) is more than 1.2 times the cross-sectional area of ​​the shovel teeth (14).

4. The trimming blade with safety teeth according to claim 1, characterized in that Each shovel tooth (14) and guard tooth (13) is made of the same material as the blade tooth (11) and is integrally formed; or each shovel tooth (14) and guard tooth (13) is a non-metallic part and is integrally formed with the blade tooth (11) which is a metal part.

5. The trimming blade with safety teeth according to claim 1, characterized in that The cross section of the shovel teeth (14) is one of an ellipse, a dome trapezoid, a square, a circle or a special shape.

6. The trimmer blade with safety teeth according to claim 1, characterized in that When viewed from the side of the blade tooth (11), the upper and lower ends of the shovel tooth (14) protrude as a whole from the outer end surface of the guard tooth (13), so that the shovel tooth (14) has the same thickness with equal distances at the upper and lower ends; or, the lower end of the shovel tooth (14) protrudes from the outer end surface of the guard tooth (13), so that the cross section of the shovel tooth (14) is conical; or, the upper and lower ends of the shovel tooth (14) are respectively connected to the outer end surface of the guard tooth (13), and the middle area thereof protrudes along the outer end surface of the guard tooth (13) to form a conical shape.

7. The trimmer blade with safety teeth according to claim 1, characterized in that Each guard tooth (13) is formed on the cutting surface (112) of the blade tooth (11), and the shovel tooth (14) is formed centrally on the outer end surface of each guard tooth (13) so that the edges around the shovel tooth (14) and the edges around the guard tooth (13) are spaced apart; or, the shovel tooth (14) is formed laterally centrally on the outer end surface of each guard tooth (13), and its bottom surface forms a coplanar surface with the bottom surface of the guard tooth (13) and the tooth surface (111) of the blade tooth (11).

8. The trimmer blade with safety teeth according to claim 1, characterized in that Each guard tooth (13) is formed on the tooth surface (111) of the blade tooth (11), and the shovel tooth (14) is formed centrally on the outer end surface of each guard tooth (13) so that the edges around the shovel tooth (14) and the edges around the guard tooth (13) are spaced apart; or, the shovel tooth (14) is formed laterally centrally on the outer end surface of each guard tooth (13), and its bottom surface is coplanar with the bottom surface of the guard tooth (13).

9. The trimmer blade with safety teeth according to claim 1, characterized in that Guard teeth (13) are respectively formed on the cutting surface (112) and the tooth surface (111) of each blade tooth (11), and a shovel tooth (14) is formed centrally on the outer end surface of each guard tooth (13) so that the edges around the shovel tooth (14) are spaced from the edges around the guard tooth (13); or, a shovel tooth (14) is formed laterally centrally on the outer end surface of the guard tooth (13) on one side of the tooth surface (111), and its bottom surface is coplanar with the bottom surface of the guard tooth (13).

10. The cutter head assembly is characterized in that The present invention comprises a trimming blade with safety teeth as described in any one of 1 to 9.

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