Personal care device and shaving razor head

Abstract

The present disclosure relates to a personal care device and a shaving cartridge, the personal care device comprising a base portion and at least one shaving unit provided on the base portion, the shaving unit comprising: a shaving moving knife having an axis of rotation and being configured to rotate about the axis of rotation in a predetermined direction, the shaving moving knife comprising a knife disc and a plurality of cutting blades located at one end face of the knife disc; a shaving cartridge having an outer base surface, an inner base surface, and an annular shaving track, the annular shaving track having a plurality of capture holes, and the capture holes having a front wall surface and / or a rear wall surface as viewed in the predetermined direction; wherein the intersection of the front wall surface and the rear wall surface with the outer base surface is defined as a contact edge, the projection of the contact edge on a plane perpendicular to the axis of rotation is configured as a curvilinear shape with varying curvature, and the curvature of the middle portion of the contact edge is greater than the curvature of the two end portions of the contact edge. The technical solution provided by the present disclosure can reduce the sliding resistance to the skin and improve the user experience.

Description

Technical Field

[0001] This disclosure relates to the technical field of cleaning appliances, and particularly to a personal care device and a razor foil. Background Technology

[0002] Electric shavers typically utilize the relative motion between a shaving foil and moving blades. The moving cutting edge of the moving blades works in conjunction with the fixed cutting edge of the shaving foil to cut the hair.

[0003] However, most razor foils have a single-hole design. When shaving, the edges of the holes can create significant resistance to the skin that gets stuck in them, making it difficult to remove the skin smoothly. This can cause a pulling sensation on the skin, leading to pain, redness, and other discomfort in the shaving area, reducing shaving comfort and decreasing shaving speed and efficiency. Utility Model Content

[0004] The purpose of this disclosure is to provide a personal care device and shaving foil that can reduce sliding resistance to the skin and improve the user experience.

[0005] According to one aspect of this disclosure, a personal care device is provided, the personal care device comprising a base portion and at least one shaving unit disposed on the base portion, the base portion housing a drive component and a drive output component, the drive output component being coupled to the drive component, wherein the shaving unit comprises: a shaving blade having a rotation axis and configured to rotate about the rotation axis in a predetermined direction, the shaving blade including a blade disc and a plurality of cutting blades located at one end face of the blade disc, the cutting blades having movable cutting edges, the shaving blade being tractively connected to and driven by the drive output component; and a shaving foil having a facing direction. The skin surface has an outer base surface, an inner base surface facing the shaving blade, and an annular shaving track arranged around the axis of rotation. The annular shaving track has a plurality of capture holes, and the capture holes have a front wall surface and a rear wall surface when viewed along the predetermined direction. The junction of the front wall surface and / or the rear wall surface with the outer base surface is defined as a contact edge. The projection of the contact edge onto a plane perpendicular to the axis of rotation is constructed as a curved shape with varying curvature, and the curvature of the middle portion of the orthographic projection of the contact edge onto the plane perpendicular to the axis of rotation is greater than the curvature of the two ends of the contact edge.

[0006] The technical solution provided in this disclosure constructs the projection of the contact edge on at least a plane perpendicular to the axis of rotation into a curved shape with varying curvature. In other words, the contact edge always has a certain curvature. When the contact edge slides relative to the skin that is trapped in the capture hole, the skin can easily slide out from the inclined contact edge, thereby reducing the sliding resistance between the contact edge and the skin, reducing the pulling sensation on the skin, avoiding pain, redness and other discomfort in the shaving area, and improving shaving comfort and efficiency.

[0007] Simultaneously, because the curvature of the middle portion of the contact edge's orthographic projection onto a plane perpendicular to the rotation axis is greater than that of the two ends, the curvature of the middle portion of the contact edge is steeper than that of the two ends. When the contact edge slides relative to the skin embedded in the capture hole, the skin is more likely to slide out from the relatively curved middle portion of the contact edge, further reducing the sliding resistance between the contact edge and the skin. Furthermore, because the curvature of the two ends of the contact edge is less than that of the middle portion, the resistance exerted by the two ends on the skin is greater than that exerted by the middle portion. Therefore, the two ends of the contact edge can effectively stretch the skin, making it easier for hair to enter the capture hole and increasing the hair retrieval rate.

[0008] According to another aspect of this disclosure, a shaving foil is provided, the shaving foil having an outer base surface facing the skin surface, an inner base surface facing the shaving blade, and an annular shaving track arranged around the rotation axis, the annular shaving track having a plurality of capture holes, and the capture holes having opposing front wall surfaces and rear wall surfaces along the circumferential direction of the shaving foil; wherein, the junction of the front wall surface and / or the rear wall surface with the outer base surface is defined as a contact edge, the projection of the contact edge onto a plane perpendicular to the rotation axis is constructed as a curved shape with varying curvature, and the curvature of the middle portion of the orthographic projection of the contact edge onto the plane perpendicular to the rotation axis is greater than the curvature of the two end portions of the contact edge. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 A schematic diagram of the structure of a personal care device according to an embodiment of the present disclosure is shown;

[0011] Figure 2An exploded schematic diagram of a shaving unit according to an embodiment of the present disclosure is shown;

[0012] Figure 3 A schematic diagram of a first angle of a shaving blade according to an embodiment of the present disclosure is shown;

[0013] Figure 4 A schematic diagram of a first angle of a razor foil according to an embodiment of the present disclosure is shown;

[0014] Figure 5 A partial structural schematic diagram of a ring-shaped shaving track according to an embodiment of the present disclosure is shown;

[0015] Figure 6 A partial structural schematic diagram of the shaving blade and shaving foil in cooperation according to an embodiment of the present disclosure is shown;

[0016] Figure 7 A schematic diagram illustrating the process of a moving cutting edge gradually moving towards a fixed cutting edge according to an embodiment of the present disclosure is shown.

[0017] Figure 8 A schematic diagram illustrating the process of a moving cutting edge gradually moving towards a fixed cutting edge according to an embodiment of the present disclosure is shown.

[0018] Figure 9 A schematic diagram of a dynamic cutting edge according to an embodiment of the present disclosure is shown;

[0019] Figure 10 A schematic diagram of a second angle of a razor foil according to an embodiment of the present disclosure is shown;

[0020] Figure 11 A schematic diagram of a razor foil from a third angle according to an embodiment of the present disclosure is shown;

[0021] Figure 12 A schematic diagram of the second angle of a shaving blade according to an embodiment of the present disclosure is shown.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Matrix portion; 20. Shaving unit;

[0024] 100. Shaving blade; 101. Rotation axis; 102. Predetermined direction; 110. Blade disc; 120. Cutting blade; 121. Moving cutting edge; 1211. Second intermediate section; 1212. Third edge section; 1213. Fourth edge section; 122. Inner blade assembly; 123. Outer blade assembly; 130. Mating shaft;

[0025] 200. Shaving blade mesh; 201. Outer base surface; 202. Inner base surface; 210. Annular shaving track; 211. Inner circumferential side surface; 212. Outer circumferential side surface; 213. First shaving track; 214. Second shaving track; 215. Rib; 220. Capture hole; 221. Front wall surface; 222. Rear wall surface; 223. Fixed cutting edge; 2231. First intermediate section; 2232. First edge section; 2233. Second edge section; 224. Contact edge; 230. Top cover; 231. Intermediate base; 2311. Positioning shaft; 240. Annular wall; 241. Main body; 242. Flange. Detailed Implementation

[0026] Electric shavers typically utilize the relative motion between a shaving foil and moving blades. The moving cutting edge of the moving blades works in conjunction with the stationary cutting edge of the shaving foil to cut hair. However, the capture holes in most shaving foils are of a single-line structure. During shaving, the shaving pressure applied by the user forces some skin into the capture holes. As the shaver moves, it becomes difficult to smoothly remove the skin trapped inside the capture holes. This results in significant resistance from the edges of the capture holes against the trapped skin, causing a pulling sensation and leading to pain, redness, and other discomfort in the shaving area. This reduces shaving comfort and also slows down shaving speed, affecting shaving efficiency.

[0027] Based on this, this disclosure defines the connection point between the front and / or rear wall surfaces of the capture hole along the rotation direction and the outer base surface as the contact edge, and constructs the contact edge as a curved shape with continuously varying curvature. That is, the contact edge always possesses a certain curvature. When the contact edge slides relative to the skin trapped within the capture hole, the skin easily slides out from the curved contact edge, thereby reducing the sliding resistance between the contact edge and the skin, reducing the pulling sensation on the skin, and avoiding discomfort such as pain and redness at the shaving site, thus improving shaving comfort and efficiency. Simultaneously, because the curvature of the middle portion of the contact edge is greater than that of the two ends, the curvature of the middle portion of the contact edge is steeper than that of the two ends. When the contact edge slides relative to the skin trapped within the capture hole, the skin more easily slides out from the relatively steep middle portion of the contact edge, further reducing the sliding resistance between the contact edge and the skin. Furthermore, since the curvature of the two ends of the contact edge is less than that of the middle part, the resistance of the two ends of the contact edge to the skin is greater than that of the middle part of the contact edge to the skin. As a result, the two ends of the contact edge can effectively stretch the skin, making it easier for hair to enter the capture hole and increasing the hair retrieval rate of the capture hole.

[0028] Considering the use of both a straight moving cutting edge and a straight fixed cutting edge to cut hair, this method does not have a hair-gathering effect. When hair enters the capture hole, it may be pushed out of the cutting area, resulting in cutting failure. Furthermore, the cutting angle of the straight moving and fixed cutting edges is fixed. When dealing with hair of different thicknesses and textures, the fixed cutting angle may be too small for coarse beards, resulting in insufficient cutting force and difficulty in shaving cleanly in one go, requiring repeated shaving. On the other hand, for fine beards, the cutting angle may be relatively too large, easily pulling the beard, making the shaving process less smooth, and may also irritate the skin, resulting in a pulling sensation and ineffective cutting.

[0029] To this end, this disclosure further constructs the moving cutting edge and / or the fixed cutting edge as a curved structure with constant curvature, varying curvature, or continuously varying curvature. Thus, throughout the entire shearing stroke of the moving and fixed cutting edges—from the moment the two cutting edges come into contact to the moment they separate—the shearing angle gradually changes. This ensures that the shearing effect of adjacent parts is similar throughout the shearing process, guaranteeing effective shearing at every point, resulting in a larger effective shearing area and higher shearing efficiency. Furthermore, there are no abrupt changes throughout the entire process, providing a consistent shaving experience from start to finish, avoiding sudden changes that could cause shaving pauses, improving smoothness, and enhancing the user experience.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this disclosure, but not all embodiments.

[0031] like Figure 1 As shown, this disclosure provides a personal care device that may include a base portion 10 and at least one shaving unit 20 disposed on the base portion 10. The base portion 10 is used to provide support for the shaving unit 20, and the shaving unit 20 is used to perform hair shaving actions.

[0032] For example, the base portion 10 may include a bottom structure and a head support structure connected to the bottom structure. The bottom structure has an energy source and a drive component, the drive component being coupled to a drive output component. The energy source provides energy for the power output of the drive component. The head support structure may include a transmission component, and the shaving unit 20 is mounted on the head support structure. The head support structure may be fixedly or detachably connected to the bottom structure. When the head support structure with the shaving unit 20 is connected to the bottom structure, the output end of the drive component is connected to the shaving unit 20 via the drive output component and the transmission component to drive the shaving unit 20 to perform hair shaving. The number of shaving units 20 may be one, two, or three, etc. When there are multiple shaving units 20, each shaving unit 20 rotates around its respective rotation axis. The personal care device may be a razor, trimmer, etc., for shaving hair, or a lint remover, etc., and this disclosure does not specifically limit its use.

[0033] For details regarding the specific structure of the shaving unit 20, please refer to [link / reference]. Figures 2 to 5 As shown, in some embodiments, the shaving unit 20 may include a shaving blade 100, which serves as the active cutting component of the shaving unit 20. The shaving blade 100 has a rotation axis 101, and a drive output component can be connected to the shaving blade 100 via a transmission assembly to drive the shaving blade 100 to rotate about the rotation axis 101 in a predetermined direction 102, wherein the predetermined direction 102 may be clockwise or counterclockwise about the rotation axis 101. Specifically, the shaving blade 100 may include a shaving disc 110 and a plurality of cutting blades 120 located on one end face of the shaving disc 110. The cutting blades 120 have a moving cutting edge 121, such that the cutting blades 120 participate in the shaving operation through the moving cutting edge 121. It should be noted that the edge portion of the cutting blade 120 that participates in cutting is the moving cutting edge 121. The moving cutting edge 121 can be the entire front edge of the cutting blade 120 along the predetermined direction 102, or it can refer to a portion of the front edge of the cutting blade 120 along the predetermined direction 102. No specific limitation is made in this regard.

[0034] For example, the shaving blade 100 may be formed from a single sheet of metal that has undergone stamping and bending processes, and the cutting blade 120 may be connected to the blade disc 110 via a support leg. The blade disc 110, the support leg, and the cutting blade 120 may all have substantially the same material thickness.

[0035] In this embodiment, the shaving unit 20 may further include a shaving foil 200, which serves as a passive cutting component of the shaving unit 20. The shaving foil 200 has an outer base surface 201 facing the skin surface, an inner base surface 202 facing the shaving blade 100, and an annular shaving track 210 arranged around the rotation axis 101. The annular shaving track 210 cooperates with a plurality of cutting blades 120 to accommodate at least a portion of the cutting blades 120. The annular shaving track 210 has a plurality of capture holes 220 penetrating the outer base surface 201 and the inner base surface 202. The capture holes 220 gather hair within themselves, allowing the hair to participate in the shaving operation. The capture hole 220, viewed along a predetermined direction 102, has a front wall surface 221 and a rear wall surface 222, wherein the junction of the front wall surface 221 and / or the rear wall surface 222 with the outer base surface 201 is defined as the contact edge 224, or in other words, the edge of the front wall surface 221 and / or the rear wall surface 222 adjacent to the outer base surface 201 is the contact edge 224. The contact edge 224 is configured as a curved shape with varying curvature, at least in its orthographic projection onto a plane perpendicular to the rotation axis 101, and the curvature of the middle portion of the orthographic projection of the contact edge 224 onto the plane perpendicular to the rotation axis 101 is greater than the curvature of the two ends of the contact edge 224.

[0036] In this way, the orthographic projection of the contact edge 224 on at least the plane perpendicular to the rotation axis 101 is constructed as a curved shape with varying curvature. That is, the contact edge 224 always has a certain curvature. When the contact edge 224 slides relative to the skin that is trapped in the capture hole 220, the skin can easily slide out from the inclined contact edge 224, thereby reducing the sliding resistance between the contact edge 224 and the skin, reducing the pulling sensation on the skin, avoiding pain, redness and other discomfort in the shaving area, and improving shaving comfort and efficiency.

[0037] Meanwhile, because the curvature of the middle portion of the contact edge 224 as an orthographic projection on a plane perpendicular to the rotation axis 101 is greater than that of the two ends, the curvature of the middle portion of the contact edge 224 is steeper than that of the two ends. When the contact edge 224 slides relative to the skin within the capture hole 220, the skin is more likely to slide out from the relatively steep middle portion of the contact edge 224, thereby further reducing the sliding resistance between the contact edge 224 and the skin. Furthermore, because the curvature of the two ends of the contact edge 224 is less than that of the middle portion, the resistance of the two ends of the contact edge 224 to the skin is greater than that of the middle portion. Therefore, the two ends of the contact edge 224 can effectively stretch the skin, making it easier for hair to enter the capture hole and increasing the hair retrieval rate of the capture hole.

[0038] It should be noted that the contact edge 224 can be a spatial curve or a planar curve. In other words, when the outer base surface 201 at the annular shaving track 210 arches upward, the contact edge 224 is a spatial curve; when the outer base surface 201 at the annular shaving track 210 is perpendicular to the rotation axis 101, the contact edge 224 is a planar curve. The contact edge 224 can be a curve with curvature changes only in the middle and end portions, or it can be a curve with continuously changing curvature.

[0039] Regarding the specific structure of the razor foil 200, in some embodiments, such as Figure 4 , Figure 10 and Figure 11 As shown, the razor foil 200 is generally cap-shaped. Specifically, the razor foil 200 may include a top cover 230 and an annular wall 240. The annular wall 240 extends at least partially from the periphery of the top cover 230 along the rotation axis 101 toward the razor blade 100. Exemplarily, the annular wall 240 may include a main body 241 and a flange 242. The main body 241 extends directionally from the top cover 230 along the rotation axis 101 toward the razor blade 100, and the flange 242 extends radially outward from the periphery of the main body 241 away from the top cover 230. Alternatively, a radially outwardly bent transition section may be provided between the main body 241 and the flange 242, with the main body 241 connected to the flange 242 via the transition section.

[0040] The top cover 230 includes a central base 231 and at least one of the aforementioned annular shaving tracks 210. The central base 231 is located at the center of the top cover 230, serving as a central support portion of the top cover 230 and also acting as a shield for the interior of the shaving unit 20. Each annular shaving track 210 is arranged around the central base 231 and has an inner circumferential side surface 211 and an outer circumferential side surface 212. A capture hole 220 located on the annular shaving track 210 extends at least partially onto the inner circumferential side surface 211 and the outer circumferential side surface 212, thereby increasing the probability of hair entering the capture hole 220, improving the hair-gathering effect of the capture hole 220, and increasing cleaning efficiency. Exemplarily, the plane containing the central base 231 may be perpendicular to the rotation axis 101 or at an angle.

[0041] The annular shaving track 210 may have one or more, and correspondingly, a number of cutting blades 120 are arranged according to the number of annular shaving tracks 210.

[0042] Taking two annular shaving rails 210 as an example, the two annular shaving rails 210 are a first shaving rail 213 and a second shaving rail 214. The first shaving rail 213 is located between the second shaving rail 214 and the intermediate base 231. The capture hole 220 of the first shaving rail 213 extends to the outer circumferential side surface 212 of the first shaving rail 213, and the capture hole 220 of the second shaving rail 214 extends to the inner circumferential side surface 211 and the outer circumferential side surface 212 of the second shaving rail 214. Correspondingly, as... Figure 12 As shown, a plurality of cutting blades 120 are arranged in an inner blade group 122 and an outer blade group 123 coaxially around a rotation axis 101. The inner blade group 122 is located inside the outer blade group 123. The inner blade group 122 cooperates with the first shaving track 213 to achieve hair cutting, and the outer blade group 123 cooperates with the second shaving track 214 to achieve hair cutting.

[0043] For example, the number of cutting blades 120 in the inner blade group 122 is less than the number of cutting blades 120 in the outer blade group 123. For instance, the number of cutting blades 120 in the inner blade group 122 is five, and the number of cutting blades 120 in the outer blade group 123 is ten, thereby ensuring that the first shaving track 213 cooperating with the inner blade group 122 and the second shaving track 214 cooperating with the outer blade group 123 have similar shaving effects on the hair.

[0044] like Figure 4 and Figure 5 As shown, the capture hole 220 can be considered as being formed by dividing two adjacent ribs 215 on the annular shaving track 210. Specifically, the annular shaving track 210 is provided with a plurality of ribs 215, which are spaced apart along a predetermined direction 102. In other words, the two ends of the ribs 215 respectively overlap the inner circumferential side surface 211 and the outer circumferential side surface 212, and the capture hole 220 is located between two adjacent ribs 215. It can be understood that each rib 215 has a bottom wall near the cutting blade 120, a top wall opposite to the bottom wall, a front side wall and a rear side wall connecting the top wall and the bottom wall, wherein the front side wall is located in front of the rear side wall along the predetermined direction 102. Along the predetermined direction 102, the aforementioned front wall surface 221 is the rear side wall of the front rib 215 among the two ribs 215 that form the capture hole 220, the rear wall surface 222 is the front side wall of the rear rib 215 among the two ribs 215 that form the capture hole 220, the top wall is the part that constitutes the aforementioned outer base surface 201, and the bottom wall is the part that constitutes the aforementioned inner base surface 202.

[0045] For example, several ribs 215 can be equidistantly spaced along a predetermined direction 102 to ensure that the size and shape of each capture hole 220 are uniform, thus ensuring aesthetics and hair shaving effect.

[0046] In some embodiments, the side of the rib 215 adjacent to the cutting blade 120 bulges at least in the middle portion along the radial direction of the annular shaving track 210 away from the cutting blade 120. In other words, the bottom wall of the rib 215 bulges away from the cutting blade 120, forming a dome or curved shape that is thin in the middle and thick at both sides. This ensures the connection strength between the rib 215 and the inner circumferential side surface 211 and the outer circumferential side surface 212, while minimizing the distance between the cutting blade 120 and the outer surface of the shaving foil 200. This allows the moving cutting edge 121 and the fixed cutting edge 223 to be as close as possible to the root of the hair, reducing hair residue after cutting and improving deep shave performance.

[0047] Correspondingly, at least the middle portion of the moving cutting edge 121 bulges away from the blade disc 110, thereby forming a shape that matches the side of the rib 215 adjacent to the cutting blade 120, allowing the moving cutting edge 121 to fit snugly into contact with the fixed cutting edge 223. This allows the moving cutting edge 121 to be closer to the hair root, further improving the depth of shaving. In this case, the moving cutting edge 121 and the fixed cutting edge 223 can be spatial curves.

[0048] In some embodiments, the ratio of the total opening area of ​​the capture holes 220 within the annular shaving track 210 to the area of ​​the annular shaving track 210 on the outer base surface 201 ranges from 20% to 60%. This ensures that the capture holes 220 have sufficient area for hair entry, guaranteeing effective hair entry, while preventing skin from entering the shaving blade 100 through the capture holes 220 and being cut by the shaving blade 100, thus ensuring shaving safety. It should be noted that the area of ​​the annular shaving track 210 on the outer base surface 201 can be understood as the sum of the top wall area of ​​the rib 215 and the opening area of ​​the capture holes 220.

[0049] For example, the total opening area of ​​the capture holes 220 of the razor foil 200 is 100 mm². 2 -150mm 2 This ensures sufficient shaving area to meet shaving needs while avoiding excessive shaving area that could cause skin irritation and improve shaving safety.

[0050] In some embodiments, such as Figure 5As shown, the aspect ratio of at least one of the moving cutting edge 121, the fixed cutting edge 223, and the contact edge 224 ranges from 3% to 30%. Taking the contact edge 224 as an example, the distance between its two endpoints is d1, and the maximum distance from a point on the contact edge 224 to the lines connecting its two endpoints is d2, with an aspect ratio of d2 / d1. This facilitates the forming of the shaving blade 100 and / or the shaving foil 200, reducing production costs. Furthermore, the contact edge 224 allows for easier skin sliding along it, further reducing sliding resistance to the skin.

[0051] It should be noted that the fixed cutting edge 223 refers to at least a portion of the junction between the front wall surface 221 and the inner base surface 202. This fixed cutting edge 223 can be the entire edge of the front wall surface 221 adjacent to the cutting blade 120, or it can be a portion of the edge of the front wall surface 221 adjacent to the cutting blade 120. Figure 6 As shown in the example, the moving cutting edge 121 is the entire front edge of the cutting blade 120 along the predetermined direction 102. When the two ends of the moving cutting edge 121 just come into contact with the edge of the cutting blade 120 adjacent to the front wall surface 221, the part of the edge of the cutting blade 120 adjacent to the front wall surface 221 located between the two ends of the moving cutting edge 121 is the fixed cutting edge 223.

[0052] In some embodiments, the contact edge 224 located at the junction of the front wall surface 221 and the outer base surface 201, and / or the contact edge 224 located at the junction of the rear wall surface 222 and the outer base surface 201, are provided with rounded corners of 0.05mm-0.15mm. This makes the shaving foil 200 smoother when in contact with the skin, effectively reducing friction and scraping of the shaving foil 200 against the skin during shaving, reducing skin irritation, and making the shaving experience more comfortable. Accordingly, the rounded corners can also make each original contact edge 224 include a first edge and a second edge arranged in parallel.

[0053] In some embodiments, such as Figure 6 and Figure 7 As shown, during the rotation of the shaving blade 100 around the rotation axis 101, viewed from a perspective parallel to the rotation axis 101, the moving cutting edge 121 gradually approaches the fixed cutting edge 223 along a predetermined direction 102, then contacts the fixed cutting edge 223, and finally separates from it. When the moving cutting edge 121 intersects the fixed cutting edge 223 and undergoes a misalignment, the moving cutting edge 121 and the fixed cutting edge 223 cooperate to cut the hair entering the capture hole 220. Furthermore, within one shearing stroke, the fixed cutting edge 223 and the moving cutting edge 121 enclose a shearing space γ, which gradually shrinks until it disappears, while the shearing angle α continuously changes, for example... Figure 6 and Figure 7 During the process, as the moving cutting edge 121 moves towards the fixed cutting edge 223, the shear angle α continuously changes from α3 to α2 and α1, with α3 > α2 > α1. It should be noted that the shear angle α is formed between the fixed cutting edge 223 and the moving cutting edge 121; in other words, the shear angle α is the angle formed by the tangents of the fixed cutting edge 223 and the moving cutting edge 121 at their intersection point. The shear stroke is the distance traveled by the moving cutting edge 121 and the fixed cutting edge 223 from contact to separation.

[0054] In this way, compared to the discomfort caused by the abrupt change in shear angle α in the shearing scheme of V-shaped fixed cutting edge and V-shaped moving cutting edge, the present disclosure shows that in the shearing stroke of the moving cutting edge 121 and the fixed cutting edge 223, that is, from the process of the two cutting edges coming into contact to the process of separation, the shear angle α changes gradually. The shear angle α does not change abruptly throughout the process, and the change is more gradual. This avoids the sudden pulling sensation caused by the sudden change of the shear angle α, which would cause the shaving to stop. It ensures the consistency of the shaving experience before and after, thereby improving the smoothness of the personal care device and improving the user experience.

[0055] Furthermore, because the shearing angle α gradually changes throughout the entire shearing stroke, multiple shearing angles α of different values ​​exist within each shearing segment. This allows for shearing from multiple shearing positions within each segment, ensuring that the shearing effect of each segment is similar and provides effective shearing throughout the entire shearing process. In other words, the entire moving cutting edge 121 and the fixed cutting edge 223 can be effectively sheared, resulting in a larger effective shearing area and improved shearing efficiency. Simultaneously, within a shearing stroke, the moving cutting edge 121 and the fixed cutting edge 223 enclose a shearing space γ, which gradually shrinks until it disappears. As the shearing space γ gradually shrinks, it can gather the hair, reducing the possibility of hair being pushed out of the shearing area and causing shearing failure, further improving shearing efficiency.

[0056] In order to achieve a gradual change in the shear angle α within the shear stroke, in some embodiments, at least one of the fixed cutting edge 223 and the moving cutting edge 121 can have a curved shape with continuously changing curvature on the plane perpendicular to the rotation axis 101, thereby utilizing the characteristic that the tangent at each point on the curve is gradually changing to achieve a gradual change in the shear angle α.

[0057] In some embodiments, when the orthographic projection of the fixed cutting edge 223 onto a plane perpendicular to the rotation axis 101 is constructed as a curve with continuously varying curvature, at least the middle portion of the fixed cutting edge 223 bulges towards the predetermined direction 102. That is, the fixed cutting edge 223 gradually extends inward from both ends towards the predetermined direction 102. Thus, during the shearing stroke of the moving cutting edge 121 and the fixed cutting edge 223, a gradual change in the shearing angle α can be achieved, and the shearing space γ formed by the moving cutting edge 121 and the fixed cutting edge 223 gradually shrinks as the moving cutting edge 121 moves towards the fixed cutting edge 223, thereby achieving the aforementioned hair-gathering effect. It should be noted that the fixed cutting edge 223 can be a spatial curve or a planar curve. For example, when the inner base surface 202 at the annular shaving track 210 arches upward, the fixed cutting edge 223 is a spatial curve. In this case, the fixed cutting edge 223 being a curve with continuously changing curvature can also be understood as at least the projection of the fixed cutting edge 223 onto a plane perpendicular to the rotation axis 101 being a curve with continuously changing curvature. When the inner base surface 202 at the annular shaving track 210 is perpendicular to the rotation axis 101, the contact edge 224 is a planar curve.

[0058] Accordingly, in this embodiment, the moving cutting edge 121 can be constructed as a straight line or a curved shape.

[0059] It is understandable that when both the fixed cutting edge 223 and the contact edge 224 are curved shapes with continuously changing curvature, the fixed cutting edge 223 and the contact edge 224 can be formed when forming the capture hole 220 that penetrates the outer base surface 201 and the inner base surface 202 by ensuring the alignment of the fixed cutting edge 223 and the contact edge 224 along the rotation axis 101, which facilitates processing and production.

[0060] Furthermore, the orthographic projection of the fixed cutting edge 223 onto a plane perpendicular to the rotation axis 101 can be constructed as an arc shape, with the arc shape opening direction opposite to the predetermined direction 102, thereby facilitating production and reducing production costs.

[0061] Furthermore, the orthographic projection of the fixed cutting edge 223 onto at least the plane perpendicular to the rotation axis 101 can also be constructed as a multi-segment structure. Specifically, such as... Figure 8As shown, the orthographic projection of the fixed cutting edge 223 on a plane perpendicular to the rotation axis (101) may have a first intermediate section 2231, and a first edge section 2232 and a second edge section 2233 located at both ends of the first intermediate section 2231. Along the predetermined direction 102, the first intermediate section 2231 is located in front of the first edge section 2232 and the second edge section 2233. The curvature of the first edge section 2232 and the curvature of the second edge section 2233 are both less than the curvature of the first intermediate section 2231, so that the curvature at both ends of the fixed cutting edge 223 is relatively gentle compared to the curvature in the middle. This allows the hair to be gathered towards the middle during the cutting process, while avoiding gathering most of the hair in the middle for cutting. This also allows both ends of the fixed cutting edge 223 to participate in effective cutting, improving cutting efficiency.

[0062] In some embodiments, when the orthographic projection of the movable cutting edge 121 onto a plane perpendicular to the rotation axis 101 is constructed as a curved shape, the middle portion of the movable cutting edge 121 bulges in the direction opposite to the predetermined direction 102. That is, the movable cutting edge 121 gradually extends inward from both ends in the direction opposite to the predetermined direction 102. In this way, during the shearing stroke between the movable cutting edge 121 and the fixed cutting edge 223, a gradual change in the shearing angle α can be achieved, and the shearing space γ enclosed by the movable cutting edge 121 and the fixed cutting edge 223 can be gradually reduced as the movable cutting edge 121 moves towards the fixed cutting edge 223, thereby achieving the aforementioned hair gathering effect.

[0063] Furthermore, the orthographic projection of the moving cutting edge 121 onto a plane perpendicular to the rotation axis 101 can be constructed as an arc shape, and the opening direction of the arc shape is the same as the predetermined direction 102, thereby facilitating production and reducing production costs.

[0064] Furthermore, the orthographic projection of the moving cutting edge 121 onto at least the plane perpendicular to the rotation axis 101 can also be constructed as a multi-segment structure. Specifically, such as... Figure 9As shown, the orthographic projection of the moving cutting edge 121 onto a plane perpendicular to the rotation axis (101) may have a second intermediate section 1211, and a third edge section 1212 and a fourth edge section 1213 located at both ends of the second intermediate section 1211. The first intermediate section 2231 and the second intermediate section 1211 may be correspondingly arranged, the third edge section 1212 and the first edge section 2232 may be correspondingly arranged, and the fourth edge section 1213 and the second edge section 2233 may be correspondingly arranged. Along the predetermined direction 102, the second intermediate section 1211 is located behind the third edge section 1212 and the fourth edge section 1213. The curvature of the third edge section 1212 and the curvature of the fourth edge section 1213 are both less than the curvature of the second intermediate section 1211, so that the curvature of the two ends of the moving cutting edge 121 is relatively gentle compared with the curvature of the middle. This allows the hair to be gathered towards the middle during the cutting process, while avoiding gathering most of the hair in the middle for cutting. This also allows the two ends of the moving cutting edge 121 to participate in effective cutting, improving cutting efficiency.

[0065] It should be pointed out that, as Figure 8 As shown, when the orthographic projections of the moving cutting edge 121 and the fixed cutting edge 223 on at least the plane perpendicular to the rotation axis 101 are both constructed as curved shapes, the moving cutting edge 121 and the fixed cutting edge 223 can form an interlocking cutting method, which can further enhance the effect of gathering the beard, while ensuring the effective cutting area and improving shaving efficiency.

[0066] For example, the curvature range of at least one of the moving cutting edge 121, the fixed cutting edge 223, and the contact edge 224 is (0, 3 mm). -1 ].

[0067] In some embodiments, the distance between the contact edge 224 at the junction of the front wall surface 221 and the outer base surface 201 and the contact edge 224 at the junction of the rear wall surface 222 and the outer base surface 201 is approximately constant, thereby making the width of each capture hole 220 nearly uniform, resulting in a larger capture hole 220, ensuring the hair capture rate and improving the cutting efficiency.

[0068] In some embodiments, such as Figure 2 and Figure 10 As shown, the center of the cutter head 110 may be provided with a coupling feature so that the cutter head 110 is connected to the transmission element in the housing through the coupling feature, so that the power transmitted by the transmission element can be transmitted to the cutter head 110 to drive the cutter head 110 to rotate.

[0069] The coupling feature can be a connecting hole or a mating shaft. Taking a connecting hole as an example, the cutter head 110 can be connected to the mating shaft 130 through the connecting hole. The mating shaft 130 has a positioning hole at its top end and a connecting part at its bottom end. The connecting part is used to connect with the transmission element inside the housing to transmit power. Correspondingly, the inner surface of the intermediate base 231 is provided with a positioning shaft 2311. The positioning shaft 2311 is used to mate with the positioning hole to ensure the accuracy of the relative position of the shaving blade 100 and the shaving foil 200 after assembly, thus ensuring the shearing effect.

[0070] According to another aspect of this disclosure, a shaving foil 200 is also provided. The shaving foil 200 has an outer base surface 201 facing the skin surface, an inner base surface 202 facing the shaving blade 100, and an annular shaving track 210 arranged around a rotation axis 101. The annular shaving track 210 has a plurality of capture holes 220, and the capture holes 220 have a front wall surface 221 and a rear wall surface 222 disposed opposite to each other along the circumferential direction of the shaving foil 200. The junction of the front wall surface 221 and / or the rear wall surface 222 with the outer base surface 201 is defined as a contact edge 224. The contact edge 224 is configured as a curved shape with continuously varying curvature at least in the orthographic projection on a plane perpendicular to the rotation axis 101, and the curvature of the middle portion of the orthographic projection of the contact edge 224 on the plane perpendicular to the rotation axis 101 is greater than the curvature of the two end portions of the contact edge 224.

[0071] It should be noted that the specific structure of the razor foil 200 can be found in the detailed description in the above embodiments, and will not be repeated here.

[0072] The terms "upper" and "lower" used in this disclosure are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships without substantially altering the technical content should also be considered as part of the scope of implementation of this disclosure.

[0073] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0074] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A personal care device, characterized in that, The personal care device includes a base portion (10) and at least one shaving unit (20) disposed on the base portion (10), the base portion (10) accommodating a drive component and a drive output component coupled to the drive component, wherein the shaving unit (20) includes: A shaving blade (100) having a rotation axis (101) and configured to rotate about the rotation axis (101) in a predetermined direction (102), the shaving blade (100) including a blade disc (110) and a plurality of cutting blades (120) located on one end face of the blade disc (110), the cutting blades (120) having a moving cutting edge (121), the shaving blade (100) being tractively connected to and driven by the drive output member; The shaving foil (200) has an outer base surface (201) facing the skin surface, an inner base surface (202) facing the shaving blade (100), and an annular shaving track (210) arranged around the rotation axis (101), the annular shaving track (210) having a plurality of capture holes (220), and the capture holes (220) having a front wall surface (221) and a rear wall surface (222) when viewed along the predetermined direction (102); The junction of the front wall surface (221) and / or the rear wall surface (222) with the outer base surface (201) is defined as the contact edge (224). The contact edge (224) is constructed as a curved shape with varying curvature at least in the orthographic projection on the plane perpendicular to the rotation axis (101), and the curvature of the middle portion of the orthographic projection of the contact edge (224) on the plane perpendicular to the rotation axis (101) is greater than the curvature of the two ends.

2. The personal care device according to claim 1, characterized in that, The shaving foil (200) includes a top cover (230) and an annular wall (240), wherein, The annular wall (240) extends at least partially from the periphery of the top cover (230) along the axis of rotation (101) toward the shaving blade (100); The top cover (230) includes a central base (231) and at least one of the annular shaving tracks (210), the annular shaving tracks (210) having a plurality of ribs (215) spaced apart along the predetermined direction (102), the capture hole (220) being located between two adjacent ribs (215), and the side of the rib (215) adjacent to the cutting blade (120) bulging away from the cutting blade (120) along the central portion of the radial direction of the annular shaving track (210) on the side of the rib (215) adjacent to the cutting blade (120).

3. The personal care device according to claim 1, characterized in that, The ratio of the total opening area of ​​the capture holes (220) within the annular shaving track (210) to the area of ​​the annular shaving track (210) on the outer base surface (201) ranges from 20% to 60%.

4. The personal care device according to claim 1, characterized in that, At least a portion of the junction between the front wall surface (221) and the inner base surface (202) is defined as a fixed cutting edge (223); The aspect ratio of at least one of the moving cutting edge (121), the fixed cutting edge (223), and the contact edge (224) ranges from 3% to 30%.

5. The personal care device according to claim 1, characterized in that, At least a portion of the junction between the front wall surface (221) and the inner base surface (202) is defined as a fixed cutting edge (223); The curvature range of the moving cutting edge (121) is (0, 3mm) -1 ], or, the curvature range of the fixed cutting edge (223) is (0, 3mm) -1 ], or, the curvature range of the contact edge (224) is (0, 3mm) -1 ].

6. The personal care device according to claim 1, characterized in that, The contact edge (224) located at the junction of the front wall surface (221) and the outer base surface (201) and / or the contact edge (224) located at the junction of the rear wall surface (222) and the outer base surface (201) are provided with rounded corners, and the rounded corners are 0.05mm-0.15mm.

7. The personal care device according to any one of claims 1 to 6, characterized in that, At least a portion of the junction between the front wall surface (221) and the inner base surface (202) is defined as a fixed cutting edge (223); During the rotation of the shaving blade (100) around the rotation axis (101), the moving cutting edge (121) and the fixed cutting edge (223) intersect each other to cut the hair. Within one cutting stroke, the moving cutting edge (121) and the fixed cutting edge (223) enclose a cutting space (γ), and the cutting space (γ) gradually shrinks until it disappears. A cutting angle (α) is formed between the fixed cutting edge (223) and the moving cutting edge (121). The cutting angle (α) changes. The cutting stroke is the stroke from contact to separation between the moving cutting edge (121) and the fixed cutting edge (223).

8. The personal care device according to claim 7, characterized in that, The fixed cutting edge (223) is constructed as a curved shape with varying curvature in its orthogonal projection on at least the plane perpendicular to the axis of rotation (101), and the middle portion of the fixed cutting edge (223) bulges toward the predetermined direction (102).

9. The personal care device according to claim 8, characterized in that, The orthographic projection of the fixed cutting edge (223) onto a plane perpendicular to the rotation axis (101) has a first intermediate segment (2231), and a first edge segment (2232) and a second edge segment (2233) located at both ends of the first intermediate segment (2231), wherein, Along the predetermined direction (102), the first intermediate segment (2231) is located in front of the first edge segment (2232) and the second edge segment (2233), and the curvature of the first edge segment (2232) and the curvature of the second edge segment (2233) are both less than the curvature of the first intermediate segment (2231).

10. The personal care device according to claim 1, characterized in that, The moving cutting edge (121) is constructed to be curved in at least the orthographic projection on a plane perpendicular to the axis of rotation (101), and the middle portion of the moving cutting edge (121) bulges in a direction opposite to the predetermined direction (102).

11. The personal care device according to claim 1, characterized in that, The distance between the contact edge (224) located at the junction of the front wall surface (221) and the outer base surface (201) and the contact edge (224) located at the junction of the rear wall surface (222) and the outer base surface (201) is approximately constant.

12. The personal care device according to claim 1, characterized in that, The curvature of the contact edge (224) on at least its orthographic projection onto a plane perpendicular to the axis of rotation (101) changes continuously.

13. The personal care device according to claim 1, characterized in that, The total opening area of ​​the capture holes (220) of the razor foil (200) is 100 mm². 2 -150mm 2 .

14. A razor foil, characterized in that, The shaving foil (200) has an outer base surface (201) facing the skin surface, an inner base surface (202) facing the shaving blade (100), and an annular shaving track (210) arranged around the rotation axis (101). The annular shaving track (210) has a plurality of capture holes (220), and the capture holes (220) have a front wall surface (221) and a rear wall surface (222) arranged opposite to each other along the circumferential direction of the shaving foil (200). The junction of the front wall surface (221) and / or the rear wall surface (222) with the outer base surface (201) is defined as the contact edge (224). The contact edge (224) is constructed as a curved shape with varying curvature at least in the orthographic projection on the plane perpendicular to the rotation axis (101), and the curvature of the middle portion of the orthographic projection of the contact edge (224) on the plane perpendicular to the rotation axis (101) is greater than the curvature of the two ends of the contact edge (224).

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