Blade, blade set, mechanism with blade set, and method for preparing blade

Abstract

The present invention discloses a blade, a blade assembly, a mechanism having a blade assembly, and a method for preparing the blade. The blade includes a working surface and a non-working surface. The working surface is provided with at least one recess in a direction perpendicular thereto, and the recess is distributed away from the blade edge. A second protective layer is provided in the recess, and the thickness of the second protective layer is no greater than the depth of the recess. When the blade assembly formed by the blade and another blade is in use, the working surfaces of the two blades rub against each other. As the friction continues, the second protective layer in the recess is continuously rubbed off. The second protective layer scattered by friction is carried out of the recess by the movement of the blades and is located on the working surfaces of the two blades, thereby lubricating the working surfaces. Even if a small amount of the second protective layer is brought to the blade edge, this part of the second protective layer is rubbed off as the blade moves, thereby ensuring the cutting force of the blade edge. Therefore, the blade has antibacterial properties and is comfortable to use while the cutting force is not weakened.

Description

Technical Field

[0001] The present invention relates to the technical field of blades, and in particular to a blade, a blade assembly, a mechanism having a blade assembly, and a method for preparing the blade. Background Art

[0002] In the prior art, the blades in shavers, beard trimmers, or hair clippers are generally made of metal materials. During use, the blades inevitably come into contact with the skin of a person or an animal. The surface of the blade that comes into contact with the skin of a person or an animal is a non-working surface, and the surface of the other side of the blade is a working surface. A plurality of spaced-apart teeth are provided on the head of the blade, and the cutting edges of all the teeth fall on the working surface. When the moving blade of the blade assembly moves relative to the stationary blade, in order to reduce the friction between the working surfaces of the moving blade and the stationary blade and avoid the defect of the blade temperature rising due to the friction, it is necessary to provide a protective layer on the working surface of the blade to play a lubricating and protective role on the working surfaces of the stationary and moving blades, thereby reducing the temperature rise of the blade due to the friction.

[0003] In the prior art, when forming a protective layer, the blade is usually directly immersed in a liquid medicine to allow the protective layer to adhere to the working surface of the blade. However, the thickness of the protective layer formed is relatively thick. The thick protective layer formed on the blade edge weakens the sharpness of the blade due to the influence of the protective layer, and the resistance encountered by the blade during the cutting process increases, which is not conducive to the cutting performance of the shaver, hair clipper or hair clipper. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that a relatively thick protective layer is formed on the working surface of the blade. When the working surface of the blade is lubricated, the sharpness of the blade is weakened when the relatively thick protective layer is covered on the blade, which in turn affects the cutting performance of the blade.

[0005] To this end, the present invention provides a blade, comprising a blade body, wherein the blade body has a working surface and a non-working surface arranged in opposite directions;

[0006] The working surface is provided with at least one recess in a direction perpendicular thereto, and the recess avoids the cutting edge distribution of the blade teeth; a second protective layer is provided in the recess, and the thickness of the second protective layer is not higher than the depth of the recess; the second protective layer at least includes a material that acts as a lubricant.

[0007] Optionally, in the above-mentioned blade, the recess is a groove or a through hole.

[0008] Optionally, in the above-mentioned blade, the thickness of the second protective layer is smaller than the depth of the recess.

[0009] Further preferably, in the above-mentioned blade, the first surface of the second protective layer facing the working surface is a sloped surface;

[0010] The slope surface is inclined inwardly along the root of the blade toward the head of the blade, and the thickness of the second protective layer gradually decreases from the root toward the head.

[0011] Preferably, for the above blade, the thickness of the second protective layer and the depth of the recess satisfy the following relationship:

[0012] 0.5H2≤H 1max ≤0.75H2; where H1 is the thickness of the second protective layer and H2 is the depth of the recess.

[0013] Preferably, the blade has a plurality of spaced teeth formed on the head thereof;

[0014] There is one recess, and the recess extends along the arrangement direction of all the blade teeth.

[0015] Preferably, in the above-mentioned blade, the recesses correspond to the teeth one by one, and at least parts of the recesses are provided on the corresponding teeth.

[0016] Preferably, in the above-mentioned blade, all the teeth of the blade are arranged linearly, the recess is triangular, the center line of the triangle coincides with the center line of the tooth, and the distance L1 between the two sides of the triangle and the cutting edge of the adjacent teeth satisfies the following relationship:

[0017] 0.1mm≤L1≤0.5mm;

[0018] The distance L2 between the triangular head and the end surface of the blade tooth satisfies the following relationship: 0.2 mm ≤ L1 ≤ 0.5 mm.

[0019] Optionally, in the above-mentioned blade, all the teeth of the blade are distributed along the circumference of a circle;

[0020] When the blade is a movable blade, the head end surface of the teeth of the movable blade serves as the working surface; or

[0021] When the blade is a stationary blade, the blade teeth of the stationary blade include at least an annular shearing portion and a connecting portion bent on both side walls of the shearing portion, and the curved surface formed by the inner wall surfaces of the shearing portion and the connecting portion serves as a working surface.

[0022] Optionally, the blade comprises a mounting portion, an arc portion and cutting teeth sequentially arranged from the root portion toward the head portion;

[0023] The head of the mounting portion is transitionally connected to the root of the cutter tooth via the arc portion, and the arc portion is bent outwards relative to the cutter tooth in a direction perpendicular to the working surface.

[0024] Optionally, in the above-mentioned blade, the working surface is partially distributed on the arc-shaped portion.

[0025] Optionally, in the above-mentioned blade, the non-working surface is covered with a first protective layer, and the first protective layer at least includes a material having a lubricating effect.

[0026] Optionally, the above-mentioned blade is provided with a third protective layer on at least a portion of the working surface, the thickness H3 of the third protective layer is less than the thickness H4 of the first protective layer, and the third protective layer at least includes a lubricating material.

[0027] Optionally, in the above-mentioned blade, the third protective layer extends to and covers the cutting edge of the tooth, and the thickness of the third protective layer at the cutting edge is less than the thickness of the third protective layer at other positions on the working surface.

[0028] The present invention also provides a blade assembly, comprising a stationary blade and a movable blade moving relative to the stationary blade;

[0029] At least one of the stationary blade and the movable blade adopts any one of the blades described above.

[0030] The present invention also provides a mechanism with a blade assembly, comprising the above blade assembly.

[0031] Optionally, the above-mentioned mechanism with a blade assembly is a shaver, a beard shaver or a hair clipper.

[0032] The present invention provides a method for preparing the above-mentioned blade, comprising the following steps:

[0033] S1: machining at least one recess on the working surface of the insert;

[0034] S2: attaching a second protective layer at least within the recess, so that the first surface of the second protective layer facing the working surface does not protrude from the working surface;

[0035] S3: Curing the blade to solidify the second protective layer on the blade.

[0036] Optionally, the above-mentioned method for preparing a blade further comprises, in step S2:

[0037] Attaching a first protective layer to at least the non-working surface;

[0038] In step S3, the blade is cured so that the first protective layer and the second protective layer are cured on the blade.

[0039] Optionally, in the above-mentioned method for preparing a blade, in step S2, the method further includes attaching a third protective layer on the working surface, so that the thickness of the third protective layer is less than the thickness of the first protective layer.

[0040] Optionally, in the above-mentioned method for preparing the blade, in step S2, a protective layer is first attached to the working surface, the non-working surface and the inside of the recess; then, at least the protective layer on the working surface is thinned to form a third protective layer.

[0041] Optionally, in the above-mentioned method for preparing the blade, in step S2, when thinning the protective layer on the working surface, the cutting edge of the blade teeth is exposed; or

[0042] When thinning the protective layer on the working surface, the thickness of the protective layer at the cutting edge of the cutter teeth is made smaller than the thickness of the protective layer at other positions on the working surface.

[0043] Optionally, in the above-mentioned method for preparing a blade, in step S2, the protective layer in the recess is thinned to form a second protective layer, so that the thickness of the second protective layer is not higher than the depth of the recess.

[0044] The technical solution of the present invention has the following advantages:

[0045] 1. The blade provided by the present invention includes a blade body, wherein the blade body has a working surface and a non-working surface arranged back to back; the working surface is provided with at least one recess in a direction perpendicular thereto, and the recess is distributed away from the cutting edges of the blade teeth; a second protective layer is provided in the recess, and the thickness of the second protective layer is not higher than the depth of the recess; the second protective layer includes at least a material that acts as a lubricant.

[0046] The blade of this structure has a recess on the working surface, and the recess is distributed away from the blade edge; a second protective layer is provided in the recess. When the blade set formed by this blade and another blade is in use, the working surfaces of the two blades rub against each other. As the friction continues, the second protective layer in the recess is continuously rubbed off. The second protective layer scattered by friction is brought out of the recess when the blade moves and is located on the working surfaces of the two blades, lubricating the working surfaces of the blades. Even if a small amount of the second protective layer is brought to the blade edge, this part of the second protective layer will be rubbed off as the moving blade in the blade set moves, thereby achieving a lubricating effect on the working surface while ensuring the sharpness of the blade edge, so that the cutting force of the blade will not be weakened.

[0047] 2. The blade provided by the present invention further has a first protective layer on the non-working surface. The first protective layer ensures the antibacterial property of the non-working surface of the blade while ensuring the comfort of the user's skin when in contact with the non-working surface of the blade, so that the blade has antibacterial properties and is comfortable to use while the cutting force is not weakened.

[0048] 3. The present invention provides a blade set, including a moving blade and a stationary blade, at least one of the moving blade and the stationary blade adopts the above-mentioned blade, so that the blade set can meet the comfort and antibacterial properties required by the user while ensuring the cutting force at the cutting edge of the blade.

[0049] 4. The present invention provides a method for preparing the above-mentioned blade, comprising the following steps: S1: machining at least one depression on the working surface of the blade; S2: attaching a second protective layer at least in the depression, so that the first surface of the second protective layer facing the working surface does not protrude from the working surface; S3: curing the blade so that the second protective layer is cured on the blade to obtain the above-mentioned blade, so that the blade can achieve lubrication of the working surface of the blade, low temperature rise and ensure the sharpness of the blade during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 This is a schematic structural diagram of the blade provided in Example 1 of the present invention (working surface side);

[0052] Figure 2 for Figure 1 A partial enlarged schematic diagram of the middle blade;

[0053] Figure 3 for Figure 1 Schematic diagram of the structure of the middle blade;

[0054] Figure 4a for Figure 3 Schematic diagram of the structure of the middle blade (non-working surface side);

[0055] Figure 4b for Figure 3 A schematic diagram of the three-dimensional structure of the middle blade in the side direction;

[0056] Figure 5 for Figure 3 A partial enlarged view of the middle blade;

[0057] Figure 6 for Figure 1 Schematic diagram of the structure between the second protective layer, recess and blade thickness of the middle blade;

[0058] Figure 7 This is a schematic diagram of the exploded structure of the blade provided in Example 3 of the present invention;

[0059] Description of reference numerals:

[0060] 1. Blade; 11. Mounting portion; 12. Arc-shaped portion; 2. Teeth; 21. Blade; 22. Shearing portion; 23. Connecting portion; 31. Working surface; 4. Recess; 5. Second protective layer; 32. Non-working surface. DETAILED DESCRIPTION

[0061] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0062] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0064] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0065] Example 1

[0066] The embodiment of the present invention provides a blade 1, such as Figures 1 to 6 As shown, the blade 1 includes a blade body, which has a working surface 31 and a non-working surface 32 , and the non-working surface 32 and the working surface 31 are arranged in back-to-back relationship.

[0067] In this embodiment, a reciprocating movable blade is used as an example. A mounting portion is provided on the root of the blade 1, and a plurality of spaced and linearly arranged teeth 2 are provided on the head. The cutting edges 21 of all the teeth 2 fall on the working surface 31.

[0068] The blade 2 includes a shearing portion 22, a shearing surface 311 of the shearing portion 22 is located on the working surface 31, and the other side surface is located on the non-working surface 32. The non-working surface 32 is covered with a first protective layer (not shown in the figure); Figure 1 As shown, the working surface 31 is provided with several recesses 4 in a direction perpendicular to the working surface, and the recesses are distributed away from the cutting edges 21 of the blade teeth 2; a second protective layer 5 is provided in the recess 4, and the thickness of the second protective layer 5 is not higher than the depth of the recess 4.

[0069] That is, in the direction perpendicular to the working surface, the two surfaces of the second protective layer are the first surface and the second surface respectively. Figure 2 and Figure 4a As shown, the first surface and the second surface do not protrude beyond the respective working surface 31 and non-working surface 32, ensuring that the second protective layer does not affect the frictional movement between the working surfaces 31 of the moving blade and the stationary blade. Both the first and second protective layers include at least a lubricating material.

[0070] The blade 1 of this structure is covered with a first protective layer on the non-working surface 32. The first protective layer ensures that the non-working surface 32 of the blade 1 has antibacterial properties while ensuring comfort when the user's skin comes into contact with the non-working surface 32 of the blade 1; a recess 4 is provided on the working surface 31, and the recess 4 is arranged away from the cutting edge 21 of the cutting tooth 2; a second protective layer is provided in the recess 4. When the blade assembly formed by the movable blade and the stationary blade is in use, the working surfaces 31 of the two blades 1 are constantly rubbed against each other. As the friction continues, the second protective layer in the recess 4 is continuously worn away and then carried out of the recess 4 and onto the working surfaces 31 of the two blades 1, thereby lubricating the working surfaces 31 of the blades 1. Even if a small amount of the second protective layer is brought to the cutting edge 21, as the movable blade in the blade assembly moves, this part of the second protective layer will not stay at the cutting edge of the cutting edge 21, thereby ensuring the cutting force of the cutting edge of the cutting edge 21, so that the cutting force of the blade 1 will not be weakened while having antibacterial properties and comfort.

[0071] like Figure 1 As shown, the recess 4 may be a groove or a through hole, and the second protective layer is disposed in the groove or through hole. The shape of the groove or through hole is not limited and may be selected as required.

[0072] Optimally, the recesses 4 correspond to the teeth 2 one by one, and at least the heads of the recesses 4 are located on the corresponding teeth 2. Figure 1As shown, the head of the recess 4 is provided on the tooth 2, and the root of the recess 4 is located outside the root of the tooth 2. Thus, during the use of the moving blade and the stationary blade, after the second protective layer in the recess 4 is rubbed off, at least each recess 4 can lubricate the working surface 31 of the tooth 2 where it is located, thereby reducing the friction area and friction force between the teeth 2 on the moving blade and the stationary blade, and protecting the teeth 2.

[0073] Preferably, the thickness of the second protective layer is less than the depth of the recess 4, thereby reducing the contact area between the working surfaces 31 of the stationary blade and the movable blade, reducing the heat generated by the friction between the two, and thus reducing the temperature rise of the blade assembly during use, which is beneficial for frictional heat dissipation of the blade 1. In particular, the surface of the inner side wall of the recess does not participate in friction, which can accelerate heat dissipation.

[0074] Preferably, when the depression 4 is a groove, the depth of the depression 4 and the thickness of the blade 1 where the depression 4 is located satisfy the following relationship: H2 = (1 / 100~1 / 3)H5, wherein H2 is the depth of the depression 4; H5 is the thickness of the blade 1 where the depression 4 is located, so as to accommodate the second protective layer without reducing the strength of the blade to lubricate the working surface.

[0075] Furthermore, if Figure 6 As shown, the first surface of the second protective layer facing the working surface 31 is a slope; the slope is inclined inward along the root of the blade 1 toward the head of the blade 1, and the thickness of the second protective layer gradually decreases from its root toward its head.

[0076] Due to the setting of the slope, with the continuous friction between the moving blade and the stationary blade, the second protective layer is gradually rubbed from its root toward its head. Before the head of the second protective layer is rubbed, the stationary blade cannot rub and contact the entire second protective layer, and can only contact part of the surface of the slope, ensuring that during the use of the blade group, the contact area between the stationary blade and the moving blade is reduced, further reducing the heat generated by friction and reducing the temperature rise of the blade.

[0077] Since the blade 1 in this embodiment is a reciprocating movable blade, the working surface 31 on the blade 1 is a plane. The above-mentioned slope can be an arc slope or an inclined surface. Assume that the plane where the line connecting the root end and the head end of the slope lies is the first plane. Figure 6 As shown, the angle formed between the first plane and the working surface 31 is A, and the angle of A is selected from 2° to 15°, for example, A is 2°, 3°, 5°, 8°, 10°, 12°, 13°, 13.5°, 15°, etc. By further limiting the inclination angle between the first plane and the working surface 31, the second protective layer is more likely to fall out of the recess 4 during the friction process and be taken out of the recess 4, so as to be located on the working surface 31, thereby better protecting the working surface 31.

[0078] As a variation, of course, the angle A can also exceed the above range, and the specific angle can be selected according to actual needs. For example, the tilt angle A can be 25°, 30°, etc.

[0079] When the first surface of the second protective surface is a slope, optimally, the thickness H1 of the second protective layer and the depth H2 of the recess 4 satisfy the following relationship: 0.5H2≤H 1max ≤0.75H2. For example, H 1max =0.5H2, 0.55H2, 0.6H2, 0.65H2, 0.7H2, 0.75H2. In multiple tests, it was found that controlling the maximum thickness of the second protective layer within the above range and selecting the angle A between 2° and 15°, together, facilitated the second protective layer to slide out of the depression along the slope more easily after being rubbed off, thereby lubricating the working surface.

[0080] Optimally, as Figure 5 As shown, on the basis of satisfying the above-mentioned relationship between the thickness of the second protective layer and the depth of the recess 4, the recess is a triangular groove, the center line of the triangle coincides with the center line of the tooth 2, and the distance L1 between the two sides of the triangle and the blade 21 of the adjacent tooth 2 satisfies the following relationship: 0.1mm≤L1≤0.5mm; the distance L2 between the head of the triangle and the end face of the tooth 2 satisfies the following relationship: 0.2mm≤L2≤0.5mm.

[0081] During the research and development process, the applicant found that when the groove is triangular, the corresponding slope is also triangular, and the center of the triangle coincides with the center line of the tooth 2, ensuring that the friction force exerted on the tooth 2 during operation is symmetrical and uniform, and the setting of the recess will not affect the strength of the tooth; at the same time, only when L1 and L2 simultaneously satisfy the above relationship, the second protective layer of the recess is rubbed off and brought out of the recess along the slope, the second protective layer can be on the shear surface of the tooth, but is rarely transferred to the cutting edge of the blade. Even if there is some scattered second protective layer on the cutting edge, it will fall into the recess again with the movement of the blade, and will not affect the cutting force of the tooth; at the same movement speed of the moving blade, if it exceeds the above range, as the blade is used for a longer time, the scattered second protective layer is more likely to stay at the cutting edge, and the sharpness of the cutting edge decreases, but it is still higher than the sharpness of the cutting edge of the blade in the prior art.

[0082] In addition, if Figure 4bAs shown, more preferably, the blade 1 includes a mounting portion 11, an arc-shaped portion 12 and a tooth 2 arranged in sequence from its root toward its head; the head of the mounting portion and the root of the tooth are transitionally connected by the arc-shaped portion 12, and the arc-shaped portion 12 is bent outward compared to the tooth in a direction perpendicular to the working surface. The setting of the arc-shaped portion 12, on the one hand, reduces the working surface of the blade 1, and the moving blade and the static blade will not contact at the arc-shaped portion, thereby reducing the contact area of the working surfaces of the moving blade and the static blade, reducing the heat generated by the friction between the two, and thereby reducing the temperature rise of the blade caused by friction; on the other hand, a heat dissipation channel is formed between the moving blade and the static blade, which facilitates the gas in the external environment to dissipate heat to the blade through the heat dissipation channel, thereby increasing the heat dissipation speed and further reducing the temperature rise of the blade; at the same time, the setting of the heat dissipation channel facilitates the placement or supplementation of the second protective layer in the recess through the heat dissipation channel to prevent the second protective layer in the recess from being unable to lubricate and protect the working surface of the blade after being rubbed, thereby supplementing the second protective layer through the heat dissipation channel and extending the service life of the blade.

[0083] More preferably, if Figure 4b As shown, part of the working surface 31 is distributed on the arc portion 12. At this time, the working surface is an arc-shaped surface, and part of the recess 4 can be set on the arc portion 12, so that the recess 4 transitions from the arc portion to the blade teeth, which is convenient for the outside air in the heat dissipation channel to directly enter the recess 4 from the arc portion 12, dissipate heat for the blade, and supplement the second protective layer from the heat dissipation channel to the recess 4.

[0084] As a variation, part of the working surface may not be distributed on the arc portion 12 but may be distributed entirely on the cutting teeth.

[0085] For the first protective layer and the second protective layer, the same material can be used. For example, the material of the protective layer includes at least one polymer material, and the at least one polymer material includes at least one of polyparaxylene, polytetrafluoroethylene (PTEF), perfluoroalkoxy polymer resin (PFA), fluorinated ethylene-propylene (FEP), ethylene-tetrafluoroethylene copolymer (ETFE), polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), ethylene chlorotrifluoroethylene copolymer (ECTFE), polyvinyl pyrrolidone (PVP), polyethylene, polypropylene, polymethyl methacrylate, and fluoropolymer (PTEF), or at least two of them are physically mixed in any proportion. The material of the protective layer can also be other polymers including the above materials, as long as the material has high stability, safety in use, and wear resistance. In other words, the material of the protective layer is not limited to that disclosed in the present invention.

[0086] In addition, it should be noted that, in this embodiment, no protective layer is provided on the working surface 31 of the blade 1, ensuring that the cutting edge 21 of the cutting tooth 2 is always exposed, thereby ensuring the cutting force or sharpness of the blade 1 during operation.

[0087] Example 2

[0088] This embodiment provides a blade 1, which is different from the blade 1 provided in Example 1 only in that:

[0089] A third protective layer (not shown) is provided on at least part of the working surface 31, and the thickness H3 of the third protective layer is less than the thickness H4 of the first protective layer. The third protective layer at least includes a lubricating material, and the materials of the first and second protective layers mentioned above can be directly used.

[0090] There are several situations for the location of the third protective layer:

[0091] The first case: the third protective layer covers the entire working surface 31, that is, the third protective layer is also covered on the cutting edge of the blade 21, but the thickness of the third protective layer at the cutting edge 21 is less than the thickness of the third protective layer at other positions on the working surface 31, so that the third protective layer lubricates the working surface 31 and forms a double lubrication effect with the second protective layer. Although the thinner third protective layer at the cutting edge has a slight effect on the cutting force of the cutting edge, during the operation of the blade 1, the third protective layer at the cutting edge is more easily rubbed off due to the movement of the blade 1. Compared with the existing technology, it can also improve the sharpness of the cutting edge.

[0092] The thickness of the third protective layer at the cutting edge may also be less than the thickness of the second protective layer. Generally, the thickness of the second protective layer is greater than the thickness of the third protective layer at other positions on the working surface 31.

[0093] In addition, since the third protective layer covers the entire working surface 31, the third protective layer and the second protective layer are connected as a whole on the inner wall of the recess 4, and the adhesion of the second protective layer in the recess 4 is transferred to the third protective layer to increase the adhesion of the third protective layer on the working surface 31, forming an integral protective surface.

[0094] For example, due to the setting of the recess 4, the third protective layer is connected to the second protective layer as a whole. Even if the thickness of the third protective layer is set to 0.001 mm, the structural stability of the protective layer is still very high, and will not affect the frictional heat generated during later use and cause expansion, shedding or separation.

[0095] In the second scenario, a third protective layer is provided on the working surface 31, but not on the cutting edge of the blade 21. This exposes the cutting edge to the environment, ensuring the cutting force of the cutting edge. Furthermore, the third protective layer and the second protective layer 5 can be connected as a single unit at the inner sidewall of the groove, or separated, that is, disconnected at the inner sidewall of the recess 4. Similarly, in the first scenario described above, the third protective layer and the second protective layer can also be separated.

[0096] The other structures are the same as those in Example 1 and will not be described in detail here. Please refer to the description of Example 1.

[0097] As a variation of Examples 1 and 2, when the plurality of teeth 2 on the head of the blade 1 are arranged linearly, the recesses 4 may not correspond one-to-one with the teeth 2. For example, some teeth 2 may correspond to a recess 4, while others may not. As the blade 1 moves, the working surface 31 continuously rubs, gradually rubbing away the second protective layer within the recesses 4. Driven by the blade's movement, the entire working surface 31 can also be lubricated.

[0098] As a further variation, the recess 4 is one, and the recess 4 extends along the direction in which all the teeth 2 are linearly arranged. A second protective layer is provided in the recess 4, and the second protective layer is a whole, which can also achieve the effect of the above-mentioned lubricating working surface 31.

[0099] In the above-mentioned embodiment 1 or embodiment 2, the blade 1 is a moving blade as an example to illustrate its structure. Of course, the blade 1 can be a stationary blade, and its structure is the same as that of the above-mentioned moving blade, which will not be repeated here.

[0100] Example 3

[0101] This embodiment provides a blade, which is different from the blade provided in embodiment 1 or embodiment 2 only in that:

[0102] The non-working surface of the blade is not provided with the first protective layer, and the working surface is provided with a recess and a second protective layer.

[0103] The blade of this embodiment has a second protective layer provided in the recess. When the blade and the blade assembly formed by another blade are in use, the working surfaces of the two blades rub against each other. As the friction continues, the second protective layer in the recess is continuously rubbed off. The second protective layer scattered by friction is brought out of the recess when the blade moves and is located on the working surfaces of the two blades, thereby lubricating the working surfaces of the blades. Even if a small amount of the second protective layer is brought to the blade edge, the second protective layer of this part will be rubbed off as the moving blade in the blade assembly moves, thereby achieving a lubricating effect on the working surface while ensuring the sharpness of the blade edge, so that the cutting force of the blade will not be weakened.

[0104] In addition, when the third protective layer is not provided on the working surface and only the second protective layer is provided in the recess, compared with the existing method of covering the working surface with a protective layer, the amount of protective layer used can be reduced, thereby reducing the manufacturing cost of the blade.

[0105] Example 4

[0106] This embodiment provides a blade 1, which is different from the blade 1 provided in Example 1, Example 2 or Example 3 in that the arrangement of the teeth 2 is different. All the teeth 2 of the blade 1 in this embodiment are not arranged linearly. All the teeth 2 of the blade 1 are distributed along the circumferential direction of the circle. Multiple teeth 2 can be distributed on the same circle, or some teeth 2 can be distributed on one circle and some teeth 2 can be distributed on another circle. Multiple circles are concentric to form a rotating blade 1.

[0107] like Figure 7 As shown, when the blade 1 is a movable blade, the head end surface of the teeth 2 of the movable blade serves as the working surface 31, and the recess 4 is provided on the working surface 31. For example, the teeth 2 are distributed on two circumferences. Of course, all the teeth 2 can be distributed on the same circumference.

[0108] Correspondingly, the blade teeth 2 of the stationary blade include an annular shearing portion 22 and connecting portions 23 bent and formed on both side walls of the shearing portion 22. The curved surface formed by the inner wall surfaces of the shearing portion 22 and the connecting portion 23 serves as a working surface 31, the inner wall surface of the shearing portion serves as a shearing surface, and the curved surface formed by the outer wall surfaces of the shearing portion 22 and the connecting portion 23 serves as a non-working surface 32. Since the moving blade is provided with two circles of blade teeth 2, the corresponding blade teeth 2 on the stationary blade also have two circles. Along the radial direction of the circumference, adjacent connecting portions 23 of two blade teeth 2 are connected.

[0109] The aforementioned recess 4 can be provided on the working surface 31 of the moving blade or the working surface 31 of the stationary blade, or both the moving and stationary blades. The recess 4 of the stationary blade and the recess 4 of the moving blade can be arranged in a facing direction or staggered. If the second protective layer is recessed in the recess 4, the recess 4 of the stationary blade and the recess 4 of the moving blade are preferably staggered. This facilitates the second protective layer in the recess 4 to be more easily rubbed off by the continuous friction of the working surface 31 during use of the blade assembly. If the second protective layer completely fills the recess 4, the first surface of the second protective layer is flush with the working surface 31 where the recess 4 is located. In this case, the recesses 4 of the moving and stationary blades can be arranged in a facing direction or staggered.

[0110] Example 5

[0111] This embodiment provides a blade assembly comprising a stationary blade and a movable blade that moves relative to the stationary blade. The movable blade can rotate relative to the stationary blade to form a rotary blade assembly, or the movable blade can reciprocate relative to the stationary blade to form a reciprocating blade assembly. At least one of the stationary blade and the movable blade in the blade assembly utilizes any of the blades 1 described above, so that the blade assembly meets the requirements of comfort and antibacterial properties while maintaining cutting force, thereby providing comprehensive performance.

[0112] Example 6

[0113] This embodiment provides a mechanism having a blade assembly, including the blade assembly provided in Example 5. For example, the mechanism having a blade assembly is a shaver, a beard shaver, or a hair clipper; or other structures that can adopt the above-mentioned blade assembly, so that when used, the mechanism having a blade assembly can meet user comfort and antibacterial properties while maintaining sharpness.

[0114] Example 6

[0115] An embodiment of the present invention provides a method for preparing a blade 1, comprising the following steps:

[0116] S1: machining at least one recess 4 on the working surface 31 of the blade 1;

[0117] Alternatively, the recess 4 can be formed by etching, stamping, engraving, milling, electric pulses, or the like. For example, when the recess 4 is formed by stamping, a punching machine can be used to punch the recess 4 to the desired depth on the blade 1. Parameters such as the pressure and frequency used by the punching machine are not limited and can be adjusted according to actual needs.

[0118] When the depression 4 is a through hole, a through hole is directly punched on the blade 1. The diameter of the through hole can be selected as needed without limitation. When the depression 4 is a groove, the depth of the groove is generally selected according to the thickness of the blade body where the groove is located, H2 = (1 / 100 ~ 1 / 3) H5; according to this relationship, for example, the depth H2 of the processed groove ranges from 0.03mm to 0.2mm.

[0119] For example, H2 is 0.03mm, 0.035mm, 0.05mm, 0.07mm, 0.08mm, 0.1mm, 0.15mm, 0.18mm, 0.19mm, 0.2mm, etc.

[0120] Furthermore, to facilitate the formation of the recess 4 on the blade 1, a preheating step is generally included before the recess 4 is formed. The blade 1 is preheated to at least 60°C. For example, the preheating temperature is 60°C, 65°C, or 70°C. Of course, this preheating step can also be omitted. The preheating temperature can be selected based on the material of the blade 1 and can be lower than the aforementioned 60°C.

[0121] S2: Attach protective layers to the non-working surface 32, the recess 4, and the working surface 31, respectively, so that the first surface of the second protective layer in the recess 4 does not protrude from the working surface 31; and the thickness of the third protective layer on the working surface 31 is less than the thickness of the first protective layer on the non-working surface 32;

[0122] Specifically, this step includes the following steps:

[0123] S21: spraying a coating on the non-working surface 32, the recess 4 and the working surface 31;

[0124] The thickness of the coating on the working surface 31 and the non-working surface 32 is generally within the range of 0.2 μm to 60 μm. For example, 0.2 μm, 0.5 μm, 5 μm, 10 μm, 30 μm, 40 μm, 50 μm, etc., and can also exceed the above range. In this case, the thickness of the protective layer on the working surface 31 is generally the same as the thickness on the non-working surface 32, but can also be different. The protective layer in the recess 4 completely fills the recess 4, and the first surface of the protective layer is flush with the working surface 31. If the recess 4 is a through hole, the first surface and the second surface of the protective layer are respectively flush with the working surface 31 and the non-working surface 32.

[0125] The material of the protective layer in this step can be selected, for example, a polymer material containing parylene; or a mixed material of parylene and a fluoropolymer (PTEF); or a composite material of parylene and a fluoropolymer (PTEF). For example, a composite material of a fluoropolymer and nanodiamonds, or a composite material of a fluoropolymer and silicon dioxide, can be selected to increase the hardness and wear resistance of the protective layer. In addition, the material of the protective layer provided in Example 1 above can also be used.

[0126] S22: The sprayed blade 1 is placed at room temperature for a period of time to allow the protective layer to dry on the blade 1; for example, 30 minutes, 60 minutes, 90 minutes, etc. The drying time is not limited as long as the protective layer is dried on the blade 1.

[0127] S23: heating and curing the blade 1 coated with the protective layer, so that the protective layer is cured on the blade 1;

[0128] For example, the blade 1 coated with the protective layer is placed in an oven, and the blade 1 is heated in the oven for a period of time. When the protective layer is solidified on the blade 1, the blade 1 is taken out of the oven.

[0129] For example, the heating and curing temperature is 110° C. to 200° C., for example, the curing temperature is 110° C., 150° C., and 200° C.; the curing time is 30 to 60 minutes, for example, the curing time is 30 minutes, 40 minutes, 50 minutes, and 60 minutes, and finally, the blade 1 is taken out of the oven. The oven can be replaced with other heating devices.

[0130] As for the curing temperature and time, the specific curing temperature and time need to be selected according to the material used for the protective layer. The curing temperature and time can exceed the above range. It is only necessary to cure the protective layer on the blade 1.

[0131] S24: Thinning the protective layer on the working surface 31 and the protective layer in the recess 4 so that the protective layer in the recess 4 is recessed in the recess 4 to form a second protective layer; making the protective layer on the working surface 31 smaller than the first protective layer on the non-working surface 32 to form a third protective layer.

[0132] As for the third protective layer on the working surface 31, the third protective layer at the cutting edge of the blade 21 can be completely removed to expose the cutting edge; or the third protective layer at the cutting edge of the blade 21 can be thinned to make its thickness smaller than the thickness of the third protective layer at other positions on the working surface 31;

[0133] Specifically, the protective layer on the working surface 31 and the protective layer in the recess 4 are thinned by one or more of mechanical grinding, abrasion, polishing, pushing, high-energy beam (such as electron, gamma ray, X-ray, synchrotron radiation), or plasma etching. The protective layer at the cutting edge is completely ground away to expose the cutting edge. Alternatively, the thickness of the protective layer at the cutting edge is made thinner than the thickness of the protective layer at other locations on the working surface 31, thereby forming a third protective layer on the working surface 31. The thickness of the third protective layer at other locations on the working surface 31 is thinned to be thinner than the thickness of the first protective layer.

[0134] For example, the thickness of the third protective layer and the first protective layer before grinding is 40 μm. After thinning, the thickness of the third protective layer at the cutting edge is 5 μm, and the thickness of the third protective layer at other positions on the working surface 31 is 20 μm; or the third protective layer at the cutting edge is completely removed to expose the cutting edge.

[0135] For example, the protective layer at the cutting edge is initially thinned by mechanical grinding, and then the protective layer is further thinned by high-energy beam radiation until the blade body at the cutting edge is exposed. Considering that mechanical grinding can easily damage the cutting edge of the blade 1, mechanical grinding is used for the initial grinding of the cutting edge. Generally, when the thickness of the protective layer reaches about 10 μm, gamma rays are used to further thin the protective layer at the cutting edge until the cutting edge is completely exposed.

[0136] When thinning the second protective layer, since the first surface of the protective layer in the recess is flush with the working surface during the spraying step, the second protective layer can be thinned at the same time when thinning the protective layer on the working surface, so that the first surface of the second protective layer is recessed into the recess 4, and the protective layer in the recess is retained to form a second protective layer. The thinning process is carried out until the thickness of the second protective layer reaches a preset value.

[0137] S25: Cleaning the blade 1 with the thinned protective layer to obtain a blade 1.

[0138] As a variant embodiment, in step S24, the protective layer on the working surface 31 can be completely removed, and no protective layer can be provided on the working surface 31. Accordingly, the thinning is only performed on the second protective layer. Of course, if the first surface of the second protective layer is flush with the working surface, thinning of the second protective layer is not necessary.

[0139] Alternatively, as a modified embodiment, in step S21, the protective layer can be attached to the blade 1 by other methods, not limited to spraying, such as dipping, rolling, brushing, and electroplating.

[0140] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A blade, characterized in that: The blade body comprises a working surface (31) and a non-working surface (32) which are arranged in opposite directions; The working surface (31) is provided with at least one recess (4) in a direction perpendicular to the working surface, and the recess is distributed away from the cutting edge (21) of the tooth (2) of the blade (1); a second protective layer (5) is provided in the recess (4), and the thickness of the second protective layer (5) is not higher than the depth of the recess (4); the second protective layer (5) at least includes a material having a lubricating effect; the thickness of the second protective layer (5) is less than the depth of the recess (4); The first surface of the second protective layer (5) facing the working surface (31) is a slope; the slope is inclined inwardly along the root of the blade (1) toward the head of the blade (1), and the thickness of the second protective layer (5) gradually decreases from the root toward the head; The thickness of the second protective layer (5) and the depth of the recess (4) satisfy the following relationship: 0.5H2≤H 1max ≤0.75H2; wherein H1 is the thickness of the second protective layer (5), and H2 is the depth of the recess (4); The recesses (4) correspond to the teeth (2) one by one, and at least a portion of the recesses (4) is provided on the corresponding teeth (2); all the teeth (2) of the blade (1) are arranged linearly, the recesses are triangular, the center line of the triangle coincides with the center line of the teeth (2), and the distance L1 between the two sides of the triangle and the blade (21) of the adjacent teeth (2) satisfies the following relationship: 0.1mm≤L1≤0.5mm; The distance L2 between the triangular head and the end surface of the tooth (2) satisfies the following relationship: 0.2 mm ≤ L2 ≤ 0.5 mm; The depression (4) is a groove or a through hole.

2. The blade according to claim 1, characterized in that A plurality of teeth (2) distributed at intervals are formed on the head of the blade (1); There is one recess (4), and the recess (4) extends along the arrangement direction of all the blade teeth (2).

3. The blade according to claim 1, wherein All the teeth (2) of the blade (1) are distributed along the circumference of a circle; When the blade (1) is a movable blade, the head end surface of the blade tooth (2) of the movable blade serves as the working surface (31); or When the blade (1) is a stationary blade, the blade teeth (2) of the stationary blade at least include an annular shearing portion (22) and a connecting portion (23) bent and formed on both side walls of the shearing portion (22), and a curved surface formed by the inner wall surfaces of the shearing portion (22) and the connecting portion (23) serves as a working surface (31).

4. The blade according to claim 1, wherein The blade comprises a mounting portion, an arc portion and blade teeth arranged in sequence from the root portion toward the head portion; The head of the mounting portion is transitionally connected to the root of the cutter tooth via an arc portion, and the arc portion is bent outwards relative to the cutter tooth in a direction perpendicular to the working surface.

5. The blade according to claim 4, characterized in that Part of the working surface is distributed on the arc portion.

6. The blade according to claim 1, wherein The non-working surface (32) is covered with a first protective layer, which at least includes a lubricating material.

7. The blade according to claim 6, characterized in that A third protective layer is provided on at least part of the working surface (31), the thickness H3 of the third protective layer is less than the thickness H4 of the first protective layer, and the third protective layer at least comprises a material having a lubricating effect.

8. The blade according to claim 7, characterized in that The third protective layer extends and covers the cutting edge of the tooth (2), and the thickness of the third protective layer at the cutting edge is less than the thickness of the third protective layer at other positions on the working surface (31).

9. A blade assembly, characterized in that: comprising a stationary blade and a movable blade movable relative to the stationary blade; At least one of the stationary blade and the movable blade adopts the blade according to any one of claims 1 to 8.

10. A mechanism with a blade assembly, characterized in that: The blade assembly comprises the blade assembly according to claim 9.

11. The mechanism with a blade assembly according to claim 10, characterized in that: The mechanism is a shaver, a beard shaver or a hair clipper.

12. A method for preparing the blade according to claim 1, characterized in that: The steps include: S1: machining at least one recess (4) on the working surface (31) of the blade (1); S2: attaching a second protective layer (5) at least in the recess (4) so that a first surface of the second protective layer (5) facing the working surface (31) does not protrude from the working surface (31); S3: performing a curing treatment on the blade (1) to cure the second protective layer (5) on the blade (1).

13. The method for preparing a blade according to claim 12, characterized in that: In step S2, it also includes: attaching a first protective layer to at least the non-working surface (32); In step S3, the blade (1) is cured so that the first protective layer and the second protective layer (5) are cured on the blade (1).

14. The method for preparing a blade according to claim 13, wherein: In step S2, the method further includes attaching a third protective layer on the working surface (31), so that the thickness of the third protective layer is smaller than the thickness of the first protective layer.

15. The method for preparing a blade according to claim 14, wherein: In step S2, a protective layer is first attached to the working surface (31), the non-working surface (32) and the inside of the recess (4); then, at least the protective layer on the working surface (31) is thinned to form a third protective layer.

16. The method for preparing a blade according to claim 15, characterized in that: In step S2, when thinning the protective layer on the working surface, the cutting edge of the tooth (2) is exposed; or When thinning the protective layer on the working surface, the thickness of the protective layer at the cutting edge of the cutter teeth (2) is made smaller than the thickness of the protective layer at other positions on the working surface (31).

17. The method for preparing a blade according to claim 15, characterized in that: In step S2, the protective layer in the depression is thinned to form a second protective layer, so that the thickness of the second protective layer (5) is not higher than the depth of the depression (4).

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