Cutting unit, razor head, and electric razor

Abstract

The embodiment of the invention discloses a cutting unit, a razor head and an electric razor, the cutting unit is applied to the razor, the cutting unit comprises a supporting piece with a rotating shaft and a cutting blade provided with a cutting edge, the supporting piece carries a supporting leg in the cutting blade, and the supporting leg is connected with the rotating shaft. Each cutting blade has a moving direction in the process that the cutting unit rotates around the rotating shaft; the cutting edges comprise the first cutting edge and the second cutting edge, the curvature of the first cutting edge is larger than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotating shaft is larger than or equal to the distance from the second cutting edge to the rotating shaft. The curvature of the first cutting edge of the cutting edges is larger than or equal to the curvature of the second cutting edge, and the distance between the first cutting edge and the rotating shaft is larger than or equal to the distance between the second cutting edge and the rotating shaft, so that the first cutting edge can effectively gather beards, and effective cutting is carried out in combination with the second cutting edge; and the shaving efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of shavers, and in particular to a cutting unit, a shaver head and an electric shaver. Background Art

[0002] The shaving unit of an electric shaver includes a blade and a mesh. The blade cuts the hair that enters the mesh to achieve shaving. During the shaving process, beards often enter the beard cutting area from the far end of the mesh slot. Conventional shavers use straight blades and straight slots to cut. When the beard enters the cutting area, it may be pushed to the area outside the mesh slot, resulting in shaving failure, a pulling sensation or ineffective cutting, which affects shaving efficiency. Summary of the invention

[0003] The embodiments of the present specification provide a cutting unit, a shaver head and an electric shaver to solve the problem of low shaving efficiency in the prior art.

[0004] To solve the above technical problems, the embodiments of this specification are implemented as follows: A cutting unit provided in an embodiment of the present specification is applied to a shaver, comprising a support having a rotation axis and a cutting blade provided with a cutting edge, wherein the support carries a leg of the cutting blade, and each of the cutting blades has a moving direction during the rotation of the cutting unit around the rotation axis; The cutting edges include a first cutting edge and a second cutting edge, a curvature of the first cutting edge is greater than or equal to a curvature of the second cutting edge, and a distance from the first cutting edge to the rotation axis is greater than or equal to a distance from the second cutting edge to the rotation axis.

[0005] Optionally, along the moving direction of the cutting unit, the first cutting edge is arranged in front of the second cutting edge.

[0006] Optionally, the curvature range of the first cutting edge is 0~6.

[0007] Optionally, the curvature range of the second cutting edge is 0~2.

[0008] 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 arranged asymmetrically.

[0009] Optionally, a ratio of a projection length of the first cutting edge on a horizontal plane to a projection length of the second cutting edge on a horizontal plane is 0.618+K, wherein -0.2≤K≤0.2.

[0010] Optionally, the cutting blade has a plurality of first cutting blades, and the plurality of first cutting blades are arranged on the support member at intervals along the circumference of the support member.

[0011] Optionally, the cutting blade further has a plurality of second cutting blades, which are arranged on the support member at intervals along the circumference of the support member; wherein the second cutting blade is located on a side of the first cutting blade close to the rotation axis.

[0012] A razor head provided in an embodiment of the present specification comprises a blade net applied to a razor and the cutting unit described above; wherein the blade net comprises an annular shaving track arranged concentrically around the rotating axis so as to cooperate with the cutting edge of the cutting unit; the annular shaving track is provided with an inner circumferential side surface and an outer circumferential side surface and a hair feed groove having a front edge and a rear edge when viewed along the moving direction of the cutting unit, and wherein the hair feed groove extends on at least one of the circumferential side surfaces.

[0013] Optionally, the whisker inlet groove is S-shaped, V-shaped, U-shaped or bracket-shaped.

[0014] An electric shaver provided in an embodiment of the present specification comprises a hand-held portion and the above-mentioned shaver head; wherein the shaver head is arranged on the hand-held portion.

[0015] An embodiment of this specification can achieve the following beneficial effects: The cutting unit, shaver head and electric shaver of the embodiments of this specification are configured such that the curvature of the first cutting edge of the 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, so that the first cutting edge can more effectively gather the beard, and can perform effective cutting in combination with the second cutting edge, thereby preventing the beard from being pushed outside the blade mesh groove, thereby improving shaving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a cutting blade provided in an embodiment of this specification; Figure 2 A schematic diagram of the structure of a knife net provided in an embodiment of this specification; Figure 3A schematic diagram of the structure of a cutting unit provided in an embodiment of this specification; Figure 4 A front view of a cutting unit provided in an embodiment of this specification; Figure 5 A top view of a cutting unit provided in an embodiment of this specification; Figure 6 The embodiments provided in this specification Figure 5 A partial enlarged view of the middle A; Figure 7 A top view of a cutting unit provided in an embodiment of this specification; Figure 8 The embodiments provided in this specification Figure 7 A partial enlarged view of point B in the middle; Fig. 9 A schematic diagram of shape comparison of a cutting edge provided in an embodiment of this specification; Fig.10 A schematic diagram of the projected length of the cutting edge provided in the embodiment of this specification; Fig.11 A schematic diagram of the structure of a razor head provided in an embodiment of this specification; Fig.12 A top view of a razor head provided in an embodiment of this specification; Fig.13 A schematic cross-sectional view of a razor head provided in an embodiment of this specification; Fig.14 A schematic diagram of the structure of a knife net provided in an embodiment of this specification; Fig.15 A schematic diagram of the structure of a razor head with an S-shaped shaving inlet provided in an embodiment of this specification; Fig.16 The embodiments provided in this specification Fig.15 A partial enlarged view of point C in the middle; Fig.17 A schematic diagram of the structure of a bracket-shaped whisker inlet groove provided in an embodiment of this specification; Fig.18 This is a schematic diagram of the structure of an electric shaver provided in an embodiment of this specification.

[0018] Reference numerals: 1. Straight-edge cutting blade; 2. Straight-groove knife net; 3. Cutting unit; 31. Support member; 32. Cutting blade; 321. First cutting edge; 322. Second cutting edge; 33. Support leg; 34. Fixed seat; 4. Knife net; 41. Annular shaving track; 411. Inner circumferential side surface; 412. Outer circumferential side surface; 413. Shaver inlet groove; 414. Strip bone position; 415. Bone position body; 416. First fixed foot; 417. Second fixed foot; 42. Knife net edge; 5. Razor head; 51. Knife head housing; 6. Hand-held part. DETAILED DESCRIPTION

[0019] In order to make the purpose, 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 combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of one or more embodiments of this specification.

[0020] The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.

[0021] The razor generally uses a cutting blade to cut the beard entering the knife net to complete the shaving. In practical applications, the razor usually uses a straight-edge cutting blade and a straight-groove knife net. Figure 1 A schematic diagram of the structure of a cutting blade provided in an embodiment of this specification, Figure 2 This is a schematic diagram of the structure of a knife net provided in the embodiment of this specification, see Figure 1 It can be seen that the cutting blade of the razor is a straight-edge cutting blade 1, see Figure 2 It can be seen that the knife net of the razor is a straight groove knife net 2. Under the action of the straight-edge cutting blade and the straight groove knife net, when the beard enters the cutting area of ​​the razor, it may be pushed to the area outside the knife net slot. When the user uses the razor to shave back and forth, it will produce a beard pulling feeling, and affect the shaving efficiency.

[0022] In order to solve the defects in the prior art, this solution provides the following embodiments: Figure 3 A structural diagram of a cutting unit provided in an embodiment of this specification, Figure 4 This is a front view of a cutting unit provided in an embodiment of this specification. Figure 3-Figure 4As shown, the cutting unit 3 of the embodiment of the present specification is applied to a razor. The cutting unit 3 may include a support member 31 having a rotation axis Z and a cutting blade 32 provided with a cutting edge. The support member 31 is used to support the legs 33 in the cutting blade 32. During the rotation of the cutting unit 3 around the rotation axis Z, each cutting blade 32 has a moving direction.

[0023] Figure 5 This is a top view of a cutting unit provided in an embodiment of this specification. Figure 5 As shown, the cutting unit 3 of the embodiment of the present specification may further include a fixing seat 34 coaxially arranged with the support member 31. The fixing seat 34 may be used to couple with an external drive shaft. The external drive shaft may drive the cutting unit 3 to rotate by driving the fixing seat 34.

[0024] Figure 6 The embodiments provided in this specification Figure 5 A partial enlarged view of the middle A. Figure 6 As shown, 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 may be greater than or equal to the curvature of the second cutting edge 322. Figure 3 , the distance from the first cutting edge 321 to the rotation axis Z of the embodiment of this specification may be greater than or equal to the distance from the second cutting edge 322 to the rotation axis Z.

[0025] In the embodiment of the present specification, the curvature of the first cutting edge 321 of the cutting edge 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. In this way, after the beard enters the cutting area, it can be gathered by the first cutting edge 321, thereby preventing the beard from being pushed out of the beard inlet groove of the blade net. When the user uses the razor to shave back and forth, there will be no beard pulling feeling, thereby improving the user's shaving experience. In addition, after the first cutting edge 321 gathers the beard, it can be effectively cut in combination with the second cutting edge 322, thereby having a higher shaving efficiency.

[0026] In a specific embodiment, the cutting edge of the cutting blade 32 may have a protrusion protruding in the opposite direction of the moving direction of the cutting unit 3. Due to the presence of the protrusion, the cutting edge of the cutting blade 32 can also gather the beard, avoid the beard pulling feeling and improve the shaving efficiency.

[0027] Specifically, the first cutting edge 321 and the second cutting edge 322 of the cutting edge may both be straight-line cutting edges, and the straight-line first cutting edge 321 and the straight-line second cutting edge 322 may form a preset angle with each other.

[0028] Figure 7 A bottom view of a cutting unit provided in an embodiment of this specification, Figure 8 The embodiments provided in this specification Figure 7 A partial enlarged view of point B in the figure. Figure 7-Figure 8 As shown, the first cutting edge 321 and the second cutting edge 322 may both be straight cutting edges.

[0029] It can be understood 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, and the secant line passing through the starting point and the end point of the curve of the curved cutting edge can form a preset angle with the straight line of the straight cutting edge; or, the first cutting edge 321 and the second cutting edge 322 are both curved cutting edges, for example, the first cutting edge 321 is the first curved cutting edge, and the second cutting edge 322 is the second curved cutting edge, then the secant line passing through the starting point and the end point of the curve of the first curved cutting edge can form a preset angle with the secant line passing through the starting point and the end point of the curve of the second curved cutting edge.

[0030] In the embodiment of this specification, the preset angle may be an angle greater than zero.

[0031] In order to further enhance the beard-gathering effect of the first cutting edge 321 , in the embodiment of the present specification, along the moving direction of the cutting unit 3 , the first cutting edge 321 of any cutting blade 32 may be arranged in front of the second cutting edge 322 of any cutting blade 32 .

[0032] Fig. 9 This is a schematic diagram of the shape comparison of a cutting edge provided in the embodiment of this specification. Fig. 9 a in the figure is a straight cutting edge, b is a barbed cutting edge, c is a bracket cutting edge, and d is a sickle cutting edge. The straight cutting edge a is a cutting edge in actual application. The straight cutting edge a as a whole can be used to cut beards, and the effective cutting area is large. However, since the straight cutting edge a is straight, it has no beard gathering effect, and the beards are easily pushed out of the straight cutting edge a, resulting in low shaving efficiency; for the barbed cutting edge b, although the first cutting edge of the barbed cutting edge b has a beard gathering effect, since the first cutting edge of the barbed cutting edge b is not responsible for beard cutting, the effective cutting area is small, and thus the shaving efficiency is not high; for the bracket cutting edge c, the bracket cutting edge c as a whole can have a beard gathering effect, but when the beards gather, they will gather to the middle of the bracket cutting edge c. In this way, the effective cutting area is only the middle of the bracket cutting edge c, and the effective cutting area is also small, and thus the shaving efficiency is not high.

[0033] In order to improve the beard gathering effect relative to the straight cutting edge a and avoid the situation where the effective cutting area of ​​the barb-shaped cutting edge b and the bracket-shaped cutting edge c is small, the sickle-shaped cutting edge d is provided in the embodiment of the present specification. The curvature range of the first cutting edge of the sickle-shaped cutting edge d can be 0-6. The curvature range of the second cutting edge of the sickle-shaped cutting edge d can be 0-2. Under 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, thereby achieving a higher shaving efficiency.

[0034] In the embodiment of the present specification, the curvature range of the first cutting edge of the sickle-shaped cutting edge d is 0-6, specifically [0mm -1 , 6mm -1 The curvature range of the second cutting edge of the sickle-shaped cutting edge d is 0-2, specifically [0mm -1 , 2mm -1 Preferably, the first cutting edge and / or the second cutting edge is a curve, that is, the curvature range of the first cutting edge is (0mm -1 , 6mm -1 ], and / or the curvature range of the second cutting edge is (0mm -1 , 2mm -1 ].

[0035] In order to improve the gathering effect of the cutting edge and the shaving efficiency, the curvature of the first cutting edge 321 is different from the curvature of the second cutting edge 322; and / or the first cutting edge 321 and the second cutting edge 322 are arranged asymmetrically.

[0036] Furthermore, if the projection length of the first cutting edge 321 on the horizontal plane is large and the projection length of the second cutting edge 322 on the horizontal plane is small, the shaving efficiency will be affected due to the small effective cutting area of ​​the second cutting edge 322; and if the projection length of the first cutting edge 321 on the horizontal plane is small and the projection 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 the shaving efficiency with the beard gathering effect, the ratio of the projection length of the first cutting edge 321 on the horizontal plane to the projection length of the second cutting edge 322 on the horizontal plane in the embodiment of this specification is a preset value.

[0037] Fig.10 Schematic diagram of the projection length of the cutting edge provided in the embodiment of this specification. Fig.10As shown, the projection length of the first cutting edge 321 on the horizontal plane may be S1, the projection length of the second cutting edge 322 on the horizontal plane may be S2, and the preset value, that is, S1 / S2 may be 0.618+K, wherein -0.2≤K≤0.2.

[0038] In the embodiment of this 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 knives, and the plurality of first cutting knives are arranged on the support member 31 at intervals along the circumference of the support member 31 .

[0039] In order to further improve the shaving efficiency of the cutting unit 3, the cutting blade 32 may also be provided with a plurality of second cutting blades, which are arranged on the support member 31 at intervals along the circumference of the support member 31. The second cutting blade may be located on a side of the first cutting blade close to the rotation axis Z.

[0040] Based on the same idea, the embodiment of this specification also provides a razor head.

[0041] Fig.11 This is a schematic diagram of the structure of a razor head provided in an embodiment of this specification. Fig.12 A top view of a razor head provided in an embodiment of this specification. Fig.13 This is a cross-sectional schematic diagram of a razor head provided in an embodiment of this specification. Figure 11-13 As shown, the razor head of the embodiment of the present specification may include a blade net 4 applied to the razor and the above-mentioned cutting unit 3, and the blade net 4 may be covered on the cutting unit 3. The blade net 4 may include an annular shaving track 41 arranged concentrically around the rotation axis Z so as to cooperate with the cutting edge of the cutting unit 3.

[0042] The annular shaving track 41 is provided with an inner circumferential side surface 411 and an outer circumferential side surface 412. The inner circumferential side surface 411 may be a side of the annular shaving track 41 close to the rotation axis Z of the support 31. The outer circumferential side surface 412 may be a side of the annular shaving track 41 away from the rotation axis Z of the support 31. The annular shaving track 41 is also provided with a hair feed groove 413 having a front edge and a rear edge when viewed along the moving direction of the cutting unit 3, and wherein the hair feed groove 413 extends on at least one of the inner circumferential side surface 411 and the outer circumferential side surface 412.

[0043] Furthermore, the annular shaving track 41 may include a plurality of bar-shaped bone positions 414 , and the shaving inlet grooves 413 may be disposed between adjacent bar-shaped bone positions 414 .

[0044] In the embodiment of the present specification, the cutting edge of the cutting blade 32 can abut against the inner circumferential side surface 411 of the annular shaving track 41. When the razor head is in use, the fixing seat 34 of the cutting unit 3 can be coupled with the external driving shaft to drive the cutting unit 3 to rotate along the annular shaving track 41, and the beard can enter the blade net 4 from the beard inlet groove 413 to be cut by the cutting blade 32 in the blade net 4.

[0045] In actual application, the strip bone is arranged between the outer circumferential side surface and the top of the inner circumferential side surface of the annular shaving track, one end of the strip bone is connected to the top of the outer circumferential side surface of the annular shaving track, and the other end of the strip bone is connected to the top of the inner circumferential side surface of the annular shaving track. In this way, when the beard enters the blade net from the outer circumferential side surface and the inner circumferential side surface, it is easy to be blocked by the two ends of the strip bone, thereby affecting the shaving efficiency.

[0046] Fig.14 This is a schematic diagram of the structure of a knife net provided in the embodiment of this specification. Fig.14 As shown, in the embodiment of the specification, 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 arranged on the outer circumferential side surface 412, and the second fixing foot 417 may be arranged on the inner circumferential side surface 411. Furthermore, the strip-shaped bone position 414 will not block the beard entering the blade net 4, so that the beard is easier to enter the blade net 4 to be cut, thereby improving the shaving efficiency.

[0047] In order to improve the beard gathering effect and further improve the shaving efficiency, in the embodiment of this specification, the beard feeding groove 413 of the blade net 4 may have a protrusion protruding along the moving direction of the cutting unit 3. The protrusion of the beard feeding groove 413 can cooperate with the cutting edge of the cutting blade 32 to gather the beard, thereby improving the beard gathering effect.

[0048] Specifically, Fig.15 This is a schematic diagram of the structure of a razor head with an S-shaped beard inlet provided in an embodiment of this specification. Fig.16 The embodiments provided in this specification Fig.15 A partial enlarged view of point C in the middle. Figure 15-16 As shown, the beard entry groove 413 of the embodiment of the present specification can be specifically S-shaped. A knife net edge 42 can be provided on both sides of the beard entry groove 413. After the beard enters the knife net 4, it can be cut by the cutting blade 32 and the knife net edge 42.

[0049] Fig.17 The following is a schematic diagram of the structure of a bracket-shaped whisker inlet groove provided in the embodiment of this specification. Fig.17In the embodiment of this specification, if the cutting blade 32 has a plurality of first cutting blades and a plurality of second cutting blades, the blade net 4 can also have a beard feeding groove 413 for shaving with the first cutting blade and the second cutting blade respectively.

[0050] Further, the whisker inlet groove 413 of the embodiment of this specification can also be U-shaped, or in the shape of Fig.12 Shapes such as the V-shape shown.

[0051] It is understandable that the whisker inlet groove 413 may also be in other shapes, which are not specifically limited here.

[0052] Based on the same idea, the embodiments of this specification also provide an electric shaver.

[0053] Fig.18 This is a schematic diagram of the structure of an electric shaver provided in the embodiment of this specification. Fig.18 As shown, the electric shaver of the embodiment of the present specification comprises a handheld portion 6 and the above-mentioned shaver head 5. The shaver head 5 can be arranged on the handheld portion 6.

[0054] In the embodiment of the present specification, the shaver head 5 can be mounted on a shaver head housing 51 , and then the shaver head 5 can be disposed on the handheld portion 6 through the shaver head housing 51 .

[0055] In the embodiment of this specification, in order to save industrial costs, a shaving head 5 can be provided on the head housing 51 .

[0056] In order to improve the shaving efficiency, a plurality of shaving heads 5 may be provided on the cutter head housing 51. For example, 2, 3, and 5 shaving heads 5 may be provided, which is not limited here.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0060] The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cutting unit, characterized in that: The cutting unit is applied to a shaver and comprises a support having a rotation axis and cutting blades provided with cutting edges, the support carrying legs in the cutting blades, each of the cutting blades having a moving direction during the rotation of the cutting unit around the rotation axis; The cutting edges include a first cutting edge and a second cutting edge, a curvature of the first cutting edge is greater than or equal to a curvature of the second cutting edge, and a distance from the first cutting edge to the rotation axis is greater than or equal to a distance from the second cutting edge to the rotation axis.

2. The cutting unit according to claim 1, characterized in that Along the direction in which the cutting unit moves, the first cutting edge is arranged in front of the second cutting edge.

3. The cutting unit according to claim 1, characterized in that: The curvature range of the first cutting edge is 0-6.

4. The cutting unit according to claim 1, characterized in that: The curvature range of the second cutting edge is 0-2.

5. The cutting unit according to claim 1, characterized in that: 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 arranged asymmetrically.

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

2.

7. The cutting unit according to claim 1, characterized in that: The cutting insert has a plurality of first cutting blades, and the plurality of first cutting blades are arranged on the support member at intervals along the circumferential direction of the support member.

8. The cutting unit according to claim 7, characterized in that The cutting blade further comprises a plurality of second cutting blades, which are arranged on the support member at intervals along the circumference of the support member; wherein the second cutting blades are located on a side of the first cutting blade close to the rotation axis.

9. A razor head, characterized in that: It comprises a blade net for use in a razor and a cutting unit as claimed in any one of claims 1 to 8; wherein the blade net comprises an annular shaving track which is arranged concentrically around the rotation axis so as to cooperate with the cutting edge of the cutting unit; the annular shaving track is provided with an inner circumferential side surface and an outer circumferential side surface and a hair feed groove having a front edge and a rear edge when viewed along the moving direction of the cutting unit, and wherein the hair feed groove extends on at least one of the circumferential side surfaces.

10. The razor head according to claim 9, characterized in that The whisker inlet groove is in an S-shape, a V-shape, a U-shape or a bracket shape.

11. An electric shaver, characterized in that: The invention comprises a hand-held part and a shaving head according to claim 9 or 10; wherein the shaving head is arranged on the hand-held part.

Images