Pruning blade with safe cutter teeth and cutter head assembly

Abstract

The utility model relates to a trimming blade with safe cutter teeth and a cutter head assembly, which are characterized in that each cutter tooth is respectively provided with a tooth surface contacted with skin and a cutting surface matched with cutting, protective teeth with passivated edges are formed at the tooth tip end parts of at least part of the cutter teeth, and the protective teeth 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 advantages that the protective teeth protruding relatively 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 utility model relates to a hair trimming device, more particularly to a trimming blade with safety teeth, mainly applied to the field of personal care tools such as shavers, hair clippers and shavers. BACKGROUND

[0002] The applicant applied for an invention patent on July 18, 2022, entitled "A stationary blade and a manufacturing method thereof", with publication number CN115091512B. In the invention patent, a tooth protrusion is formed on the upper end face and / or lower end face of the tooth tip of the tooth. When trimming hair, the tooth protrusion is used to prevent the tooth tip of the tooth from being too sharp to prick the skin, thereby improving the safety of the blade in use.

[0003] Although the tooth protrusion at the tooth tip of the tooth in the blade can prevent the skin from being pricked, it also increases the contact area between the tooth tip of the tooth and the skin. The tooth protrusion blocks the hair from entering the blade, thereby reducing the hair entry efficiency of the blade in use, especially the hair close to the skin cannot enter the hair guide groove between the adjacent teeth of the blade, which affects the hair trimming performance of the trimming blade. SUMMARY

[0004] To solve the above technical problems, the utility model provides a trimming blade with safety teeth. The trimming blade not only protects the skin by means of the tooth guard formed at the tooth tip of the tooth, avoids the skin from being pricked by the tooth, and improves the safety of the blade in use. At the same time, the hair close to the skin can be scooped up or lifted by the tooth guard tooth formed outside the tooth guard, thereby improving the hair entry efficiency and hair trimming performance of the blade in use.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of a trimming blade with safety teeth. The trimming blade includes a base plate, a plurality of spaced and parallel teeth are formed at at least one side edge of the base plate, and a cutting groove is formed between adjacent teeth. Each tooth has a tooth surface in contact with the skin and a cutting surface for cutting. At least the tooth tip end of part of the teeth is formed with a tooth guard with edge passivation. The tooth guard protrudes from the tooth surface and / or the cutting surface of the tooth. An edge-passivated tooth guard is provided on the outer end face of each tooth in the extension direction of the tooth. The length and width of the tooth guard are greater than those 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 that of the tooth guard.

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

[0007] Preferably, the cross-sectional area of the tooth guard is 1.2 times or more than that of the tooth guard.

[0008] Preferably, each of the spade teeth and the guard teeth are made of the same material and are integrally formed; or, each of the spade teeth and the guard teeth are non-metallic parts and are integrally formed with the metal teeth.

[0009] Preferably, the cross section of the spade teeth is one of an oval, a circular dome trapezoid, a square and a circle.

[0010] Preferably, from the side direction of the teeth, the upper and lower ends of the spade teeth protrude from the outer end surface of the guard teeth as a whole, so that the spade teeth have the same thickness at the upper and lower ends; or, the lower end of the spade teeth protrudes from the outer end surface of the guard teeth, so that the cross section of the spade teeth is tapered; or, the upper and lower ends of the spade teeth are connected to the outer end surface of the guard teeth, and the middle region protrudes from the outer end surface of the guard teeth to form a tapered shape.

[0011] Preferably, each of the guard teeth is formed on the cutting surface of the teeth, and the spade teeth are formed on the outer end surface of each of the guard teeth, so that the peripheral edges of the spade teeth and the peripheral edges of the guard teeth are spaced apart; or, the spade teeth are formed transversely on the outer end surface of each of the guard teeth, and the bottom surface of the spade teeth is coplanar with the bottom surface of the guard teeth and the tooth surface of the teeth.

[0012] Preferably, each of the guard teeth is formed on the tooth surface of the teeth, and the spade teeth are formed on the outer end surface of each of the guard teeth, so that the peripheral edges of the spade teeth and the peripheral edges of the guard teeth are spaced apart; or, the spade teeth are formed transversely on the outer end surface of each of the guard teeth, and the bottom surface of the spade teeth is coplanar with the bottom surface of the guard teeth.

[0013] Preferably, each of the guard teeth is formed on the tooth surface of the teeth, and the spade teeth are formed on the outer end surface of each of the guard teeth, so that the peripheral edges of the spade teeth and the peripheral edges of the guard teeth are spaced apart; or, the spade teeth are formed transversely on the outer end surface of each of the guard teeth, and the bottom surface of the spade teeth is coplanar with the bottom surface of the guard teeth.

[0014] On the basis of the above-mentioned trimming blade with safety teeth, the applicant further proposes a technical scheme of a cutter assembly, which comprises the above-mentioned trimming blade with safety teeth.

[0015] The utility model discloses the beneficial effect is:

[0016] 1. By setting the relatively protruding guard teeth on one or both of the tooth surface and the cutting surface of the tooth tip of each tooth, the guard teeth can form a protective effect on the skin regardless of which surface of the blade is operated by the user to face the skin, thereby avoiding the skin from being pierced or scratched and improving the use safety of the trimming blade.

[0017] 2. Since the guard teeth protrude from the tooth surface and / or the cutting surface of the tooth tip, when the trimming blade is inserted into the hair cluster, the guard teeth will first contact the skin, thereby relatively increasing the contact area of the teeth and the skin. The increase in the contact area makes the skin feel less pressure than the tooth tip with a small cross-sectional area, thereby reducing the pain of the skin and improving the use comfort of the user.

[0018] 3. The cutting blade has a plurality of guard teeth and a plurality of safety teeth, each guard tooth has a cutting edge and a rear end, each safety tooth has a cutting edge and a rear end, each safety tooth is located at the outer end of each guard tooth in the direction of the extension of the cutting edge of the guard tooth, each safety tooth has a length and a width, the length and width of each safety tooth is less than the length and width of each guard tooth, the cross-sectional area of each safety tooth in the direction perpendicular to the cutting surface is less than the cross-sectional area of each guard tooth, when the guard teeth slide along the skin surface, the smaller cross-sectional area of the safety teeth 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 DRAWINGS

[0019] Figure 1 It is a three-dimensional assembly structure diagram of the knife head assembly of the utility model embodiment

[0020] Figure 2 It is a front plan view of the trimming blade with safety teeth of the utility model embodiment

[0021] Figure 3 It is a front plan view of the second embodiment of the trimming blade with safety teeth of the utility model embodiment

[0022] Figure 4 It is Figure 2 It is a three-dimensional sectional view at A-A

[0023] Figure 5 It is Figure 2 It is a three-dimensional sectional view at B-B

[0024] Figure 6 It is Figure 2 It is a planar sectional view at C-C

[0025] Figure 7 It is Figure 6 It is an enlarged structure diagram and front projection view of the combination of the guard tooth and the safety tooth at P in the embodiment

[0026] Figure 8 It is an enlarged structure diagram and front projection view of the second embodiment of the combination of the guard tooth and the safety tooth in the embodiment

[0027] Figure 9 It is an enlarged structure diagram and front projection view of the third embodiment of the combination of the guard tooth and the safety tooth in the embodiment

[0028] Figure 10 It is an enlarged structure diagram and front projection view of the fourth embodiment of the combination of the guard tooth and the safety tooth in the embodiment

[0029] Figure 11 It is an enlarged structure diagram and front projection view of the fifth embodiment of the combination of the guard tooth and the safety tooth in the embodiment

[0030] Figure 12 It is an enlarged structure diagram and front projection view of the sixth embodiment of the combination of the guard tooth and the safety tooth in the embodiment

[0031] Figure 13 Enlarged structural view and front projection view of a seventh embodiment of the combination of a guard tooth and a digging tooth in the example

[0032] Figure 14 Enlarged structural view and front projection view of an eighth embodiment of the combination of a guard tooth and a digging tooth in the example DETAILED DESCRIPTION

[0033] The following embodiments are described in conjunction with the Figures 1-14 Further description is made to the embodiments of the utility model:

[0034] The utility model discloses a cutting blade with safety blade teeth, which can be a static blade in a hair clipper, a shaver or an epilator, of course, can also be a moving blade 2. The following embodiments are all taken as examples of the static blade, and the specific structure comprises a base sheet 1, a plurality of spaced-apart and side-by-side blade teeth 11 are formed at at least one side edge of the base sheet 1, a shearing groove 12 is formed between adjacent blade teeth 11, and the hair to be cut enters the shearing groove 12 and is cut off by the reciprocating cooperation of the mutually laminated blade teeth 11.

[0035] In production, each blade tooth 11 has a tooth surface 111 in contact with the skin and a cutting surface 112 cooperating with the other blade (i.e. the moving blade 2) for shearing, in order to prevent the tooth tip of the blade tooth 11 from pricking the skin, at least the tooth tip end of the part of the blade tooth 11 is formed with a guard tooth 13 with edge passivation, and the guard tooth 13 protrudes from the tooth surface 111 and / or the cutting surface 112 of the blade tooth 11. The edge passivation refers to the rounding treatment of the edges of each edge of the guard tooth 13, so that not only the edges of the guard tooth 13 can prevent the skin from being pricked or scratched, but also the blade can be more smooth when sliding along the skin. By setting the relatively protruding guard tooth 13 on one or both of the tooth surface 111 and the cutting surface 112 of the tooth tip of each blade tooth 11, no matter which face of the user operates the cutting blade to adhere to the skin, the guard tooth 13 can form a protective effect on the skin to avoid the skin being pricked or scratched, and the use safety of the cutting blade is improved. In actual production, the guard tooth 13 is arranged on one of the tooth surface 111 or the cutting surface 112 of the tooth tip end of the blade tooth 11, of course, the guard tooth 13 can also be arranged on the tooth surface 111 and the cutting surface 112 of the tooth tip end of each blade tooth 11 respectively according to the user's demand.

[0036] Secondly, since the guard tooth 13 protrudes from the tooth surface 111 and / or the cutting surface 112 of the tip end portion of the blade tooth 11, the guard tooth 13 will first contact the skin when the trimmer blade is inserted into the hair cluster, relatively increasing the contact area of the blade tooth 11 with the skin. The increase in the contact area will obviously reduce the pain of the skin compared to the tip of the blade tooth 11 with a small cross-sectional area, thereby improving the user's comfort. On the other hand, the protruding guard tooth 13 can also function like a comb when sliding along the skin surface, stimulating the skin nerves, accelerating the blood circulation and blood oxygen supply of the skin, and making the user feel more comfortable when using.

[0037] Since the guard tooth 13 is formed at the tip end portion of each blade tooth 11, the contact area of the tip end portion of each blade tooth 11 with the skin is increased, which will correspondingly block some hairs from entering the cutting groove 12, especially the hairs close to the skin surface. To this end, an edge-passivated spade tooth 14 is arranged in the outer end surface of each guard tooth 13 in the extension direction of the blade tooth 11. The length and width of the spade tooth 14 are smaller than those of the guard tooth 13, so that the cross-sectional area of each spade tooth 14 in the direction perpendicular to the cutting surface 112 is smaller than that of the guard tooth 13. By setting the cross-sectional area of the spade tooth 14 to be smaller than that of the guard tooth 13, the spade tooth 14 with a smaller cross-sectional area can lift or shovel the hairs close to the skin surface when the guard tooth 13 slides along the skin surface, effectively improving the hair feeding efficiency and the hair trimming effect of the trimmer blade.

[0038] To ensure the hair lifting or shoveling effect of the spade tooth 14, each spade tooth 14 extends outward along the outer end surface of the guard tooth 13, and the extension length L of the spade tooth 14 is ≤2 mm, and the extension length L of the spade tooth 14 is preferably ≤1 mm. If the extension length L of the spade tooth 14 is set to be larger, for example, 5 mm, although the spade tooth 14 will not pierce the skin, it will still cause a heavy compression of the skin, resulting in a blood mark under the skin and causing discomfort to the user. By limiting the extension length of the spade tooth 14 to be ≤2 mm, even if the spade tooth 14 completely pierces the skin, the spade tooth 14 will not cause a heavy compression of the skin due to the blocking of the outer end surface of the guard tooth 13, thereby ensuring the skin comfort when the spade tooth 14 lifts or shovels the hairs.

[0039] In actual production, the extension direction of the spade tooth 14 is the same as the extension direction of the blade tooth 11, that is, the spade tooth 14 and the blade tooth 11 are on the same axis. When the user pushes the trimmer blade to slide along the skin, the spade tooth 14 can lift or shovel the hairs close to the skin surface in the advancing direction of the blade tooth 11, thereby improving the hair feeding and hair trimming efficiency.

[0040] In some embodiments, the extension direction of the spade tooth 14 can also be set to be the same as and / or different from the extension direction of the blade tooth 11, for example, Figure 3As shown, the chisel teeth 14 at the tooth tips of the adjacent cutter teeth 11 can be inclined towards the same direction, or towards the opposite direction, or any combination thereof. For example, the cutter teeth 11 are divided into three equal parts, the chisel teeth 14 in the middle part of the cutter teeth 11 are inclined in the same direction as the extension direction of the cutter teeth 11, and the chisel teeth 14 in the two side parts of the cutter teeth 11 are inclined towards the middle part of the cutter teeth 11, so that the hair picked up or chipped up by the chisel teeth 14 can be gathered towards the middle part of the cutter, improving the hair feeding and trimming efficiency. Of course, the chisel teeth 14 in the two side parts of the cutter teeth 11 can also be inclined towards each other, so that the hair picked up or chipped up by the chisel teeth 14 can be fed into the shearing groove 12 between the adjacent cutter teeth 11, improving the hair feeding efficiency. However, the production process or mold making of the inclined chisel teeth 14 is relatively more complex, and the extension direction of the chisel teeth 14 in the embodiment is preferably the same as the extension direction of the cutter teeth 11.

[0041] To ensure the hair picking or chipping effect of the chisel teeth 14, the maximum cross-sectional area of the guard teeth 13 is 1.2 times or more, preferably 1.5 times, of the maximum cross-sectional area of the chisel teeth 14. If the ratio is too large, for example, 3 times or 5 times, etc., the cross-sectional area of the chisel teeth 14 will be relatively small when the size of the cutter teeth 11 and the guard teeth 13 is unchanged, and when the chisel teeth 14 contact the skin to pick up or chip up the hair, a relatively concentrated pressure will be applied to the skin, causing a heavy compression feeling of the skin and causing discomfort to the user. If the ratio is too small, for example, 0.5 times or 1 time, etc., the cross-sectional area of the chisel teeth 14 will be relatively large when the size of the cutter teeth 11 and the guard teeth 13 is unchanged, and the chisel teeth 14 cannot better fit the skin to pick up or chip up the hair, and the hair picking or chipping effect of the chisel teeth 14 is correspondingly reduced. In actual production, the cross-sectional area of the chisel teeth 14 is not greater than 0.5mm 2 , preferably between 0.2mm 2 and 0.35mm 2 . At this time, not only can the chisel teeth 14 pick up or chip up the hair on the skin along the surface of the skin, but also can avoid a heavy compression feeling of the skin when the chisel teeth 14 contact the skin, improving the comfort of the trimmer during use.

[0042] To facilitate the processing and forming of the guard teeth 13 and the chisel teeth 14, each chisel tooth 14 and guard tooth 13 is made of the same material as the cutter teeth 11 and is integrally formed. The guard teeth 13 and the chisel teeth 14 are made of the same material as the cutter teeth 11, and in production, the integrally formed cutter teeth 11, guard teeth 13 and chisel teeth 14 can be realized by an integral stamping forming process or a powder metallurgy forming process, which has higher production efficiency.

[0043] On the basis of the above-mentioned integral forming, the technical solution also proposes an embodiment of a split structure, as Figure 7As shown by the dotted line, each shovel tooth 14 and the guard tooth 13 is a non-metallic component, integrally formed with the metallic blade teeth 11. The term "non-metallic component" refers to the guard teeth 13 and shovel teeth 14 being made of flexible plastics such as ABS, PA, PC, POM, and PVC, while the trimmer blade can be made of ceramic or metal materials capable of forming a cutting edge. After the blade teeth 11 are formed, a secondary injection molding process is used to cover the tips of the blade teeth 11 with the guard teeth 13 and shovel teeth 14. Using flexible plastics for the guard teeth 13 and shovel teeth 14 not only provides protection and shovel function but also acts as heat insulation, preventing burns caused by friction from the blade teeth 11 and improving the safety and comfort of using the trimmer blade.

[0044] Since the spatula 14 only needs to lift or scrape up the hair close to the skin surface, there are no special requirements for its shape. It only needs to be easy to manufacture and ensure smooth sliding along the skin. In actual production, the cross-section of the spatula 14 can be one or more combinations of elliptical, domed trapezoidal, square, circular, or irregular shapes. Considering production efficiency, an elliptical shape is preferred for the spatula 14 in this embodiment. Of course, other shapes can also be used, depending on user needs; this embodiment does not impose further restrictions.

[0045] To ensure the picking or shaving effect of the spatula 14 when sliding along the skin, such as Figures 7-8 As shown in 11 to 14, when viewed from the side of the blade tooth 11, the upper and lower ends of the shovel tooth 14 protrude from the outer end face of the guard tooth 13, so that the shovel tooth 14 has the same thickness at equal intervals at both ends. With this structure, when the shovel tooth 14 contacts the skin, it will not push the skin, making the trimmer blade slide more smoothly along the skin surface and providing a better skin feel.

[0046] Of course, the upper end of the shovel tooth 14 can also be connected to the outer end face of the guard tooth 13, and the lower end can protrude from the outer end face of the guard tooth 13, making the cross-section of the shovel tooth 14 conical, such as... Figure 9 As shown, with this structure, the shovel teeth 14 are more effective at picking or shoveling hair. However, when the trimmer blade slides along the skin, the shovel teeth 14 will push against the skin surface, making the sliding relatively unsmooth and reducing the comfort of using the trimmer blade.

[0047] In addition to the two embodiments described above, the following methods may also be used: Figure 10 The structure shown has the upper and lower ends of the shovel tooth 14 connected to the outer end face of the guard tooth 13, with the middle region protruding along the outer end face of the guard tooth 13 to form a cone shape. This structure not only ensures the smoothness of the trimming blade as it slides along the skin, but also provides better hair picking or shaving effect for the shovel tooth 14. However, due to its relatively complex structure, it is relatively difficult to form. Therefore, the specific structure selected in actual production can be determined according to existing production conditions or user needs, and no further restrictions are imposed in this embodiment.

[0048] Since the guard teeth 13 can be arranged on the cutting surface 112 and / or the tooth surface 111 of the cutter tooth 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 cutter tooth 11, the shovel teeth 14 can be arranged centrally along the outer end surface of the guard teeth 13, so that the periphery of the shovel teeth 14 is spaced apart from the periphery of the guard teeth 13, as shown in Figure 8 .

[0050] Of course, when the guard teeth 13 are formed on the cutting surface 112 of the cutter tooth 11, the bottom surface of the shovel teeth 14 is coplanar with the bottom surface of the guard teeth 13, and with the tooth surface 111 of the cutter tooth 11, as shown in Figure 7 .

[0051] Forming the guard teeth 13 on the cutting surface 112 of the cutter tooth 11 can isolate the cutting edge of the moving blade 2 reciprocating along the cutting surface 112 from contacting the skin, so as to avoid scratching the skin when the moving blade 2 reciprocates along the cutting blade, and to improve the safety of use of the cutting blade. Whether the shovel teeth 14 are arranged centrally 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 cutting blade combination forms a cutting head, and only the tooth surface 111 of the cutting blade can 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 cutting blade contacts the skin, the shovel teeth 14 can also directly contact the skin and slide along the skin, and the effect of picking or shoveling hair is better. When the cutting blade combination forms a cutting head, and both surfaces (i.e. the cutting surface 112 and the tooth surface 111) of the cutting blade can directly contact the skin, the shovel teeth 14 can be arranged centrally along the outer end surface of the guard teeth 13, so that the shovel teeth 14 can play a role in picking or shoveling hair regardless of which surface of the cutting blade contacts the skin.

[0052] In addition to the above embodiment in which the guard teeth 13 are arranged on the cutting surface 112, the guard teeth 13 can also be arranged on the tooth surface 111 of the cutter tooth 11, as shown in Figure 11 and 12 , each guard tooth 13 is formed on the tooth surface 111 of the cutter tooth 11. Forming the guard teeth 13 on the tooth surface 111 increases the spacing between the cutting surface 112 and the surface of the skin, 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. Arranging the shovel teeth 14 centrally along the outer end surface of the guard teeth 13 so that the periphery of the shovel teeth 14 is spaced apart from the periphery of the guard teeth 13 can not only play a protective role when the hairdresser holds the cutting blade vertically to the scalp, so as to avoid the moving blade 2 directly contacting the scalp and cutting the skin, but also play a role as a ruler to ensure the consistency of the length of the cut hair.

[0053] In addition, as shown in Figure 12 The spade tooth 14 is formed on the outer end surface of each guard tooth 13 in the transverse center, and the bottom surface of the spade tooth 14 is coplanar with the bottom surface of the guard tooth 13. After the coplanar formation, the spade tooth 14 can slide along the skin surface, and the moving smoothness and the effect of picking or spading the hair are better than the effect of the center setting.

[0054] As shown in Figures 13-14 In order to improve the use flexibility of the trimming blade, and to enable the trimming blade to contact the skin regardless of which surface, and to prevent the skin from being cut by the passive blade 2, the 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 shaving razor for shaving body hair. During use, regardless of which surface of the trimming blade is attached to the skin, the guard tooth 13 can play a protective role to avoid cutting the skin when the active blade 2 reciprocates, thereby improving the use safety.

[0055] After the guard tooth 13 is arranged on the tooth surface 111 and the cutting surface 112 of the tooth 11, the spade tooth 14 can be formed in the transverse center of the outer end surface of each guard tooth 13, so that the peripheral edge of the spade tooth 14 is spaced apart from the peripheral edge of the guard tooth 13. As shown in Figure 14 By arranging the spade tooth 14 in the center, when any surface of the trimming blade contacts the skin, the spade tooth 14 can play a role in picking or spading the hair. Of course, as shown in Figure 14 The spade tooth 14 is formed in the transverse center of the outer end surface of the guard tooth 13 on one side of the tooth surface 111, and the bottom surface of the spade tooth 14 is coplanar with the bottom surface of the guard tooth 13. After the spade tooth 14 is coplanar with one of the guard teeth 13, when the opposite surface contacts the skin, the spade tooth 14 has a relatively poor effect of picking or spading the hair. However, when the side that is coplanar contacts the skin, the spade tooth 14 is more suitable for picking or spading the hair growing in the skin folds (such as armpit hair). Therefore, where the spade tooth 14 is arranged can be determined according to the actual use, and the present embodiment is not limited further.

[0056] On the basis of the above-mentioned trimming blade with a safety tooth, the applicant further proposes a technical scheme of a cutter head assembly, which comprises at least one piece of the above-mentioned trimming blade with a safety tooth.

[0057] The above-mentioned embodiments should not be regarded as a limitation of the present application, but any improvement based on the spirit of the present application should be within the protection scope of the present application.

Claims

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

2. The trimmer blade having a safety blade tooth according to claim 1, wherein Each blade guard (14) extends outward along the outer end surface of the tooth guard (13), the extension length L is less than or equal to 2mm, and the extension direction is the same as and / or different from the extension direction of the tooth (11).

3. The trimmer blade having a safety blade tooth as claimed in claim 1, wherein The cross-sectional area of the tooth guard (13) is more than 1.2 times the cross-sectional area of the blade guard (14).

4. The trimmer blade having a safety blade tooth of claim 1, wherein Each blade guard (14) and tooth guard (13) is made of the same material as the tooth (11) and is integrally formed; or, each blade guard (14) and tooth guard (13) is a non-metallic part and is integrally formed with the tooth (11) which is a metallic part.

5. The trimmer blade having a safety blade tooth of claim 1 wherein The cross-section of the blade guard (14) is one of an oval, a circular dome trapezoid, a square, and a circle.

6. The trimmer blade having a safety blade tooth of claim 1, wherein From the side direction of the tooth (11), the upper and lower ends of the blade guard (14) protrude from the outer end surface of the tooth guard (13) as a whole, so that the blade guard (14) has the same thickness at the upper and lower ends; or, the lower end of the blade guard (14) protrudes from the outer end surface of the tooth guard (13), so that the cross-section of the blade guard (14) is conical; or, the upper and lower ends of the blade guard (14) are connected to the outer end surface of the tooth guard (13) respectively, and the middle region protrudes from the outer end surface of the tooth guard (13) to form a conical shape.

7. The trimmer blade having a safety blade tooth of claim 1 wherein Each tooth guard (13) is formed on the cutting surface (112) of the tooth (11), and the blade guard (14) is formed on the outer end surface of each tooth guard (13) in the middle, so that the periphery of the blade guard (14) is spaced apart from the periphery of the tooth guard (13); or, the blade guard (14) is formed on the outer end surface of each tooth guard (13) in the transverse middle, and the bottom surface of the blade guard (14) is coplanar with the bottom surface of the tooth guard (13) and the tooth surface (111) of the tooth (11).

8. The trimmer blade having a safety blade tooth of claim 1, wherein Each tooth guard (13) is formed on the tooth surface (111) of the tooth (11), and the blade guard (14) is formed on the outer end surface of each tooth guard (13) in the middle, so that the periphery of the blade guard (14) is spaced apart from the periphery of the tooth guard (13); or, the blade guard (14) is formed on the outer end surface of each tooth guard (13) in the transverse middle, and the bottom surface of the blade guard (14) is coplanar with the bottom surface of the tooth guard (13).

9. The trimmer blade having a safety blade tooth of claim 1, wherein Each tooth guard (13) is formed on the cutting surface (112) of the tooth (11), and the blade guard (14) is formed on the outer end surface of each tooth guard (13) in the middle, so that the periphery of the blade guard (14) is spaced apart from the periphery of the tooth guard (13); or, the blade guard (14) is formed on the outer end surface of each tooth guard (13) in the transverse middle, and the bottom surface of the blade guard (14) is coplanar with the bottom surface of the tooth guard (13).

10. A tool bit assembly characterized by The pruning blade with the safe tooth includes the pruning blade with the safe tooth according to any one of items 1 to 9. The pruning blade with the safe tooth includes the pruning blade with the safe tooth according to any one of items 1 to 9.

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