Cutting unit, shaver head and electric shaver

Abstract

A cutting unit (3), a shaver head (5) and an electric shaver. The cutting unit is applied to a shaver. The cutting unit comprises a support member (31) having an axis of rotation (Z) and cutting blades (32) each provided with a cutting edge, wherein the support member carries supporting legs (33) in the cutting blades, and each cutting blade has a direction of movement during rotation of the cutting unit around the axis of rotation; and each cutting edge comprises a first cutting edge (321) and a second cutting edge (322), the curvature of the first cutting edge is greater than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the axis of rotation is greater than or equal to the distance from the second cutting edge to the axis of rotation. By setting the curvature of the first cutting edge of each cutting edge to be greater than or equal to the curvature of the second cutting edge thereof, and setting the distance from the first cutting edge to the axis of rotation to be greater than or equal to the distance from the second cutting edge to the axis of rotation, the first cutting edge can effectively gather the beard hair together, and cooperate with the second cutting edge to perform effective cutting, thereby improving the shaving efficiency.

Description

Cutting unit, shaving head and electric shaver

[0001] Cross-referencing

[0002] This application claims priority to Chinese Patent Application No. 2024114337175, filed on October 14, 2024, entitled "Cutting Unit, Shaver Head and Electric Shaver". The entire contents of that Chinese patent application are incorporated herein by reference. Technical Field

[0003] This application relates to the field of shaver technology, and more particularly to a cutting unit, shaver head, and electric shaver. Background Technology

[0004] An electric shaver's shaving unit consists of blades and a foil. Shaving is achieved by the blades cutting the hairs that enter the foil. During shaving, the beard hairs typically enter the cutting area from the far end of the foil's grooves. Conventional shavers use a combination of straight blades and straight grooves for cutting. When the beard hairs enter the cutting area, they may be pushed outside the foil grooves, resulting in a failed cut, a pulling sensation, or an ineffective cut, thus affecting shaving efficiency. Summary of the Invention

[0005] This specification provides a cutting unit, a shaving head, and an electric shaver to solve the problem of low shaving efficiency in the prior art.

[0006] To solve the above-mentioned technical problems, the embodiments in this specification are implemented as follows:

[0007] This specification provides a cutting unit for use in a razor, comprising a support member with a rotating axis and cutting blades with cutting edges. The support member carries legs of the cutting blades, and each cutting blade has a direction of movement during the rotation of the cutting unit around the rotating axis.

[0008] The cutting edge includes a first cutting edge and a second cutting edge. The curvature of the first cutting edge is greater than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotation axis is greater than or equal to the distance from the second cutting edge to the rotation axis.

[0009] Optionally, along the direction of movement of the cutting unit, the first cutting edge is positioned in front of the second cutting edge.

[0010] Optionally, the curvature of the first cutting edge ranges from 0 to 6.

[0011] Optionally, the curvature of the second cutting edge ranges from 0 to 2.

[0012] Optionally, the curvature of the first cutting edge is different from the curvature of the second cutting edge; and / or, the first cutting edge and the second cutting edge are asymmetrically arranged.

[0013] Optionally, the ratio of the projected length of the first cutting edge on the horizontal plane to the projected length of the second cutting edge on the horizontal plane is 0.618+K, where -0.2≤K≤0.2.

[0014] Optionally, the cutting blade has a plurality of first cutting blades, which are spaced apart on the support member circumferentially.

[0015] Optionally, the cutting blade may further have a plurality of second cutting blades, which are spaced apart circumferentially on the support member; wherein the second cutting blades are located on the side of the first cutting blade closer to the rotation axis.

[0016] This specification provides an embodiment of a shaving head, comprising a foil for use in a shaving razor and the aforementioned cutting unit; wherein the foil includes an annular shaving track arranged concentrically around the axis of rotation to engage with the cutting edge of the cutting unit; the annular shaving track has an inner circumferential side surface and an outer circumferential side surface, and a hair infeed groove having a front edge and a rear edge when viewed along the moving direction of the cutting unit, and wherein the hair infeed groove extends on at least one of the circumferential side surfaces.

[0017] Optionally, the feed groove is S-shaped, V-shaped, U-shaped, or bracket-shaped.

[0018] An electric shaver provided in this specification includes a handheld part and a shaver head as described above; wherein the shaver head is disposed on the handheld part.

[0019] One embodiment of this specification achieves the following beneficial effects:

[0020] The cutting unit, shaving head, and electric shaver of the embodiments in this specification are designed such that the curvature of the first cutting edge is greater than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotation axis is greater than or equal to the distance from the second cutting edge to the rotation axis. This allows the first cutting edge to effectively gather the beard hairs, and combined with the second cutting edge, it can effectively cut the hairs, thereby preventing the beard hairs from being pushed outside the blade mesh groove and improving shaving efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a schematic diagram of the structure of a cutting blade provided in an embodiment of this specification;

[0023] Figure 2 is a schematic diagram of a blade mesh provided in an embodiment of this specification;

[0024] Figure 3 is a schematic diagram of a cutting unit provided in an embodiment of this specification;

[0025] Figure 4 is a front view of a cutting unit provided in an embodiment of this specification;

[0026] Figure 5 is a top view of a cutting unit provided in an embodiment of this specification;

[0027] Figure 6 is a partial enlarged view of point A in Figure 5 provided in the embodiment of this specification;

[0028] Figure 7 is a top view of a cutting unit provided in an embodiment of this specification;

[0029] Figure 8 is a partial enlarged view of point B in Figure 7 provided in the embodiments of this specification;

[0030] Figure 9 is a schematic diagram of the shape comparison of a cutting edge provided in an embodiment of this specification;

[0031] Figure 10 is a schematic diagram of the projected length of the cutting edge provided in the embodiments of this specification;

[0032] Figure 11 is a schematic diagram of the structure of a shaver head provided in an embodiment of this specification;

[0033] Figure 12 is a top view of a razor head provided in an embodiment of this specification;

[0034] Figure 13 is a cross-sectional schematic diagram of a shaver head provided in an embodiment of this specification;

[0035] Figure 14 is a schematic diagram of a blade mesh provided in an embodiment of this specification;

[0036] Figure 15 is a schematic diagram of the structure of an S-shaped shaving groove shaver head provided in an embodiment of this specification;

[0037] Figure 16 is a partial enlarged view of point C in Figure 15 provided in the embodiment of this specification;

[0038] Figure 17 is a schematic diagram of a bracket-shaped wicking groove provided in an embodiment of this specification;

[0039] Figure 18 is a structural schematic diagram of an electric shaver provided in an embodiment of this specification.

[0040] Reference numerals: 1. Straight cutting blade; 2. Straight groove shaving head; 3. Cutting unit; 31. Support; 32. Cutting blade; 321. First cutting edge; 322. Second cutting edge; 33. Support leg; 34. Fixing base; 4. Shaver head; 41. Circular shaving track; 411. Inner circumferential side surface; 412. Outer circumferential side surface; 413. Hair inlet groove; 414. Strip-shaped shaving head; 415. Shaving head body; 416. First fixing foot; 417. Second fixing foot; 42. Shaver head edge; 5. Shaver head; 51. Shaver head housing; 6. Handhold. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of one or more embodiments of this specification clearer, the technical solutions of one or more embodiments of this specification will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of them. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of one or more embodiments of this specification.

[0042] The technical solutions provided in the various embodiments of this specification are described in detail below with reference to the accompanying drawings.

[0043] Shavers typically shave by cutting the hairs that enter the foil with a cutting blade. In practical applications, shavers usually use straight-edged cutting blades and straight-grooved foils. Figure 1 is a schematic diagram of a cutting blade provided in an embodiment of this specification, and Figure 2 is a schematic diagram of a foil provided in an embodiment of this specification. Referring to Figure 1, the shaver's cutting blade is a straight-edged cutting blade 1, and referring to Figure 2, the shaver's foil is a straight-grooved foil 2. Due to the action of the straight-edged cutting blade and the straight-grooved foil, when the hairs enter the cutting area of ​​the shaver, they may be pushed outside the foil grooves. When the user shaves back and forth with the shaver, this creates a pulling sensation on the hairs and affects shaving efficiency.

[0044] To address the shortcomings of existing technologies, this solution provides the following embodiments:

[0045] Figure 3 is a structural diagram of a cutting unit provided in an embodiment of this specification, and Figure 4 is a front view of a cutting unit provided in an embodiment of this specification. As shown in Figures 3 and 4, the cutting unit 3 of this embodiment is applied to a razor. The cutting unit 3 may include a support member 31 with a rotation axis Z and cutting blades 32 with cutting edges. The support member 31 is used to support the legs 33 in the cutting blades 32. During the rotation of the cutting unit 3 around the rotation axis Z, each cutting blade 32 has a direction of movement.

[0046] Figure 5 is a top view of a cutting unit provided in an embodiment of this specification. As shown in Figure 5, the cutting unit 3 in this embodiment may further include a fixed seat 34 coaxially disposed with the support member 31. The fixed seat 34 can be used to couple with an external drive shaft. The external drive shaft can drive the fixed seat 34 to rotate the cutting unit 3.

[0047] Figure 6 is a partial enlarged view of point A in Figure 5 provided in the embodiment of this specification. As shown in Figure 6, the cutting edge of the cutting blade 32 includes a first cutting edge 321 and a second cutting edge 322, and the curvature of the first cutting edge 321 can be greater than or equal to the curvature of the second cutting edge 322. Referring to Figure 3, in the embodiment of this specification, the distance from the first cutting edge 321 to the rotation axis Z can be greater than or equal to the distance from the second cutting edge 322 to the rotation axis Z.

[0048] In this embodiment, the curvature of the first cutting edge 321 is set to be greater than or equal to the curvature of the second cutting edge 322, wherein the distance from the first cutting edge 321 to the rotation axis Z is greater than or equal to the distance from the second cutting edge 322 to the rotation axis Z. This allows the beard hairs to be gathered by the first cutting edge 321 after entering the cutting area, preventing them from being pushed outside the blade feed groove. When the user shaves back and forth, there is no pulling sensation, improving the user's shaving experience. Furthermore, the gathering of the beard hairs by the first cutting edge 321, combined with the second cutting edge 322, allows for effective cutting, resulting in high shaving efficiency.

[0049] In one specific embodiment, the cutting edge of the cutting blade 32 may have a protrusion that protrudes in the opposite direction to the moving direction of the cutting unit 3. The presence of this protrusion allows the cutting edge of the cutting blade 32 to gather the beard hairs, preventing pulling and improving shaving efficiency.

[0050] Specifically, the first cutting edge 321 and the second cutting edge 322 can both be straight cutting edges, and the straight first cutting edge 321 and the straight second cutting edge 322 can form a preset angle with each other.

[0051] Figure 7 is a bottom view of a cutting unit provided in an embodiment of this specification, and Figure 8 is a partial enlarged view of point B in Figure 7 provided in an embodiment of this specification. As shown in Figures 7 and 8, the first cutting edge 321 and the second cutting edge 322 can both be straight cutting edges.

[0052] It is understandable that one of the first cutting edge 321 and the second cutting edge 322 can be a curved cutting edge and the other can be a straight cutting edge. The secant line passing through the curve start point and curve end point of the curved cutting edge and the straight line of the straight cutting edge form a preset angle with each other. Alternatively, both the first cutting edge 321 and the second cutting edge 322 can be curved cutting edges. For example, if the first cutting edge 321 is a first curved cutting edge and the second cutting edge 322 is a second curved cutting edge, then the secant line passing through the curve start point and curve end point of the first curved cutting edge can form a preset angle with the secant line passing through the curve start point and curve end point of the second curved cutting edge.

[0053] In the embodiments described in this specification, the preset angle can be an angle greater than zero.

[0054] In order to further improve the gathering effect of the first cutting edge 321 on the beard, in the embodiments of this specification, along the direction of movement of the cutting unit 3, the first cutting edge 321 of any cutting blade 32 can be arranged in front of the second cutting edge 322 of any cutting blade 32.

[0055] Figure 9 is a schematic diagram comparing the shape of a cutting edge according to an embodiment of this specification. Let a in Figure 9 be referred to as a straight cutting edge, b as a hook-shaped cutting edge, c as a bracket-shaped cutting edge, and d as a sickle-shaped cutting edge. The straight cutting edge 'a' is the cutting edge used in practical applications. While it can be used to cut beards with a relatively large effective cutting area, its straight shape means it doesn't gather beard hairs, causing them to easily be pushed outside of it, resulting in low shaving efficiency. The hooked cutting edge 'b', while having a beard-gathering effect on its first cutting edge, doesn't actually cut the beard hairs, resulting in a smaller effective cutting area and consequently, low shaving efficiency. The bracket-shaped cutting edge 'c' can also gather beard hairs, but the hairs tend to gather only in the middle, limiting the effective cutting area to the center and further reducing shaving efficiency.

[0056] To improve beard gathering compared to the straight cutting edge a, and to avoid the small effective cutting area of ​​the hook-shaped cutting edge b and the bracket-shaped cutting edge c, this embodiment of the specification provides a sickle-shaped cutting edge d. The curvature range of the first cutting edge of the sickle-shaped cutting edge d can be 0 to 6. The curvature range of the second cutting edge of the sickle-shaped cutting edge d can be 0 to 2. Within the above curvature range, the first cutting edge of the sickle-shaped cutting edge d not only has a gathering effect, but the second cutting edge of the sickle-shaped cutting edge d also has a larger effective cutting area, thus resulting in higher shaving efficiency.

[0057] In the embodiments of this specification, the curvature range of the first cutting edge of the sickle-shaped cutting edge d is 0 to 6, specifically [0 mm]. -1 6mm -1 The curvature range of the second cutting edge of the sickle-shaped cutting edge d is 0 to 2, specifically [0 mm]. -1 2mm -1 Preferably, the first cutting edge and / or the second cutting edge are curved, that is, the curvature range of the first cutting edge is (0 mm). -1 6mm -1 ], and / or the curvature range of the second cutting edge is (0 mm) -1 2mm -1 ].

[0058] To improve the gathering effect of the cutting edge and shaving efficiency, the curvature of the first cutting edge 321 is different from that of the second cutting edge 322; and / or, the first cutting edge 321 and the second cutting edge 322 are asymmetrically arranged.

[0059] Furthermore, if the projected length of the first cutting edge 321 on the horizontal plane is large and the projected length of the second cutting edge 322 on the horizontal plane is small, the shaving efficiency will be affected due to the smaller effective cutting area of ​​the second cutting edge 322. Conversely, if the projected length of the first cutting edge 321 on the horizontal plane is small and the projected length of the second cutting edge 322 on the horizontal plane is large, the shaving efficiency will be affected due to the poor beard gathering effect of the first cutting edge 321. Therefore, in order to increase the effective cutting area and improve shaving efficiency while achieving a beard gathering effect, the ratio of the projected length of the first cutting edge 321 on the horizontal plane to the projected length of the second cutting edge 322 on the horizontal plane in the embodiments of this specification is a preset value.

[0060] Figure 10 is a schematic diagram of the projected length of the cutting edge provided in the embodiment of this specification. As shown in Figure 10, the projected length of the first cutting edge 321 on the horizontal plane can be S1, and the projected length of the second cutting edge 322 on the horizontal plane can be S2. The preset value, that is, S1 / S2, can be 0.618+K, where -0.2≤K≤0.2.

[0061] In this embodiment of the specification, in order to improve the shaving efficiency of the cutting unit 3, the cutting blade 32 may be provided with a plurality of first cutting blades, which are arranged at intervals along the circumference of the support member 31.

[0062] To further improve the shaving efficiency of the cutting unit 3, the cutting blade 32 may also be provided with multiple second cutting blades, which are spaced apart circumferentially on the support member 31. The second cutting blades may be located on the side of the first cutting blade closer to the rotation axis Z.

[0063] Based on the same idea, this specification also provides a razor head in its embodiments.

[0064] Figure 11 is a structural schematic diagram of a shaver head provided in an embodiment of this specification. Figure 12 is a top view of a shaver head provided in an embodiment of this specification. Figure 13 is a cross-sectional schematic diagram of a shaver head provided in an embodiment of this specification. As shown in Figures 11-13, the shaver head of this embodiment may include a foil 4 for use in a shaver and the aforementioned cutting unit 3, wherein the foil 4 may cover the cutting unit 3. The foil 4 may include an annular shaving track 41 concentrically arranged around the rotation axis Z to engage with the cutting edge of the cutting unit 3.

[0065] The annular shaving track 41 has an inner circumferential side surface 411 and an outer circumferential side surface 412. The inner circumferential side surface 411 can be the side of the annular shaving track 41 closer to the rotation axis Z of the support member 31. The outer circumferential side surface 412 can be the side of the annular shaving track 41 away from the rotation axis Z of the support member 31. The annular shaving track 41 also has a hair inlet groove 413 having a front edge and a rear edge when viewed along the movement direction of the cutting unit 3, and wherein the hair inlet groove 413 extends on at least one of the inner circumferential side surface 411 and the outer circumferential side surface 412.

[0066] Furthermore, the annular shaving track 41 may include multiple strip-shaped shaving positions 414, and the hair inlet groove 413 may be disposed between adjacent strip-shaped shaving positions 414.

[0067] In this embodiment of the specification, the cutting edge of the cutting blade 32 can abut against the inner circumferential surface 411 of the annular shaving track 41. When the shaving head is in use, the fixing seat 34 of the cutting unit 3 can be coupled to the external drive shaft to drive the cutting unit 3 to rotate along the annular shaving track 41. The beard can enter the blade screen 4 from the beard inlet groove 413 to be cut by the cutting blade 32 in the blade screen 4.

[0068] In practical applications, the strip-shaped shaving head is positioned between the top of the outer circumferential surface and the top of the inner circumferential surface of the circular shaving track. One end of the strip-shaped shaving head is connected to the top of the outer circumferential surface of the circular shaving track, and the other end is connected to the top of the inner circumferential surface of the circular shaving track. This design makes it easier for the whiskers to be blocked by the two ends of the strip-shaped shaving head when they enter the foil from the outer and inner circumferential surfaces, thus affecting shaving efficiency.

[0069] Figure 14 is a schematic diagram of a shaving foil provided in an embodiment of this specification. As shown in Figure 14, in this embodiment, the strip-shaped bone position 414 may include a bone position body 415 and a first fixing foot 416 and a second fixing foot 417 located on both sides of the bone position body. The first fixing foot 416 may be disposed on the outer circumferential side surface 412, and the second fixing foot 417 may be disposed on the inner circumferential side surface 411. Furthermore, the strip-shaped bone position 414 will not obstruct the beard entering the shaving foil 4, thus making it easier for the beard to enter the shaving foil 4 for cutting, improving shaving efficiency.

[0070] To improve beard gathering and further enhance shaving efficiency, in this embodiment of the specification, the beard inlet groove 413 of the blade foil 4 may have a protrusion extending along the moving direction of the cutting unit 3. The protrusion of the beard inlet groove 413 can cooperate with the cutting edge of the cutting blade 32 to gather the beard and improve the beard gathering effect.

[0071] Specifically, Figure 15 is a structural schematic diagram of an S-shaped shaving groove shaver head provided in an embodiment of this specification, and Figure 16 is a partial enlarged view of point C in Figure 15 provided in an embodiment of this specification. As shown in Figures 15 and 16, the shaving groove 413 in this embodiment of the specification can specifically be S-shaped. Blade edges 42 can be provided on both sides of the shaving groove 413. After the beard enters the blade 4, it can be cut by the cutting blade 32 in cooperation with the blade edges 42.

[0072] Figure 17 is a schematic diagram of a bracket-shaped shaving groove provided in an embodiment of this specification. As shown in Figure 17, the shaving groove 413 in this embodiment can also be bracket-shaped. In this embodiment, if the cutting blade 32 has multiple first cutting blades and multiple second cutting blades, the blade mesh 4 can also have shaving grooves 413 that cooperate with the first cutting blades and the second cutting blades respectively for shaving.

[0073] Furthermore, the feed groove 413 in the embodiments of this specification can also be U-shaped or V-shaped as shown in Figure 12.

[0074] It is understandable that the inlet groove 413 can also be in other shapes, and no specific limitation is made here.

[0075] Based on the same idea, this specification also provides an electric shaver.

[0076] Figure 18 is a schematic diagram of an electric shaver provided in an embodiment of this specification. As shown in Figure 18, the electric shaver of this embodiment includes a handheld part 6 and the shaver head 5 described above. The shaver head 5 can be disposed on the handheld part 6.

[0077] In this embodiment of the specification, the shaver head 5 can be mounted on the head housing 51, and thus the shaver head 5 can be mounted on the handheld part 6 through the head housing 51.

[0078] In the embodiments described in this specification, in order to save industrial costs, a shaving head 5 may be provided on the head housing 51.

[0079] To improve shaving efficiency, multiple shaving heads 5 can be installed on the shaving head housing 51. For example, two, three, or five shaving heads 5 can be installed, etc., and there is no limitation here.

[0080] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0081] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0082] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cutting unit, characterized in that, The cutting unit is applied to a razor and includes a support member with a rotating axis and cutting blades with cutting edges. The support member carries legs of the cutting blades, and each cutting blade has a direction of movement as the cutting unit rotates around the rotating axis. The cutting edge includes a first cutting edge and a second cutting edge. The curvature of the first cutting edge is greater than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotation axis is greater than or equal to the distance from the second cutting edge to the rotation axis.

2. The cutting unit of claim 1, wherein, Along the direction of movement of the cutting unit, the first cutting edge is positioned in front of the second cutting edge.

3. The cutting unit of claim 1, wherein, The curvature of the first cutting edge ranges from 0 to 6.

4. The cutting unit of claim 1, wherein, The curvature range of the second cutting edge is 0 to 2.

5. The cutting unit of claim 1, wherein, The curvature of the first cutting edge is different from that of the second cutting edge; and / or, the first cutting edge and the second cutting edge are asymmetrically arranged.

6. A cutting unit according to any one of claims 1 to 5, characterised in that, The ratio of the projected length of the first cutting edge on the horizontal plane to the projected length of the second cutting edge on the horizontal plane is 0.618+K, where -0.2≤K≤0.

2.

7. The cutting unit of claim 1, wherein, The cutting blade has a plurality of first cutting blades, which are spaced apart on the support member along the circumferential direction.

8. The cutting unit of claim 7, wherein, The cutting blade also has a plurality of second cutting blades, which are spaced apart circumferentially on the support member; wherein the second cutting blades are located on the side of the first cutting blade closer to the rotation axis.

9. A shaving head characterized by, The invention includes a foil for use in a razor and a cutting unit as described in any one of claims 1 to 8; wherein the foil includes an annular shaving track arranged concentrically around the axis of rotation to engage with the cutting edge of the cutting unit; the annular shaving track has an inner circumferential side surface and an outer circumferential side surface, and a feed groove having a front edge and a rear edge when viewed along the direction of movement of the cutting unit, and wherein the feed groove extends on at least one of the circumferential side surfaces.

10. The shaving head of claim 9, wherein, The feed groove is S-shaped, V-shaped, U-shaped, or bracket-shaped.

11. An electric shaver, characterized in that It includes a hand-held portion and a razor head as described in claim 9 or 10; wherein the razor head is disposed on the hand-held portion.

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