A shaving razor comprising a hair cutting member having a plurality of saw teeth

Abstract

A shaving razor with a hair cutting member has a plurality of sawing teeth arranged along a hair cutting edge of the hair cutting member. Each sawing tooth has a tooth tip and a tooth edge interconnected via the tooth tip. The hair cutting member is mounted for sawing hairs present on the skin by means of the sawing teeth by moving each sawing tooth in a local direction of extension of the hair cutting edge at the location of the respective sawing tooth. A drive device is coupled to the hair cutting member for driving the hair cutting member such that the sawing teeth are moved with an average speed greater than or equal to 10 m / s. A spacing between the tooth tips of two consecutive sawing teeth is between 20 pm and 150 pm.

Description

Technical Field

[0001] The present invention relates to a razor comprising a support, a skin-engaging member, and a hair-cutting member having a plurality of serrated teeth arranged along a hair-cutting blade of the hair-cutting member, wherein the hair-cutting member is mounted to the support in a position relative to the skin-engaging surface such that the hair-cutting blade is exposed to the user's skin to cut hair present on the skin by means of the serrated teeth, and wherein the hair-cutting member is suspended relative to the support to allow the serrated teeth to move in the local extension direction of the hair-cutting blade at the position of the serrated teeth.

[0002] The present invention also relates to a method for shaving hair protruding from the skin surface using the aforementioned razor. Background Technology

[0003] Blade shaving allows for very close shaving. However, the inconvenience of blade shaving (often also known as "wet shaving") is that it requires wetting the skin and hair, for example, by applying water and by lubricating the skin and hair (e.g., by applying shaving foam). After shaving, lubricant residue needs to be removed, and lubricant can easily splatter onto clothes, furniture, or floors. Therefore, blade shaving must be done in a bathroom-like environment, and even then, it involves laborious handling of water and shaving foam. Without water and foam, the hair remains too stiff, resulting in large hair-cutting forces, large and painful dragging forces, and rapid damage to the blade's cutting edge.

[0004] Another disadvantage of blade shaving is that, especially if high-quality blades are used, the cost of replacing worn shaving blades is relatively high.

[0005] Numerous attempts have been made to extend the lifespan of razor blades and improve the shaving process by reducing hair-cutting force and resistance. One approach is to make the cutting edge reciprocate in its extending (longitudinal) direction, similar to the movement of a knife or saw during cutting. An example of a blade razor with a straight cutting edge using this principle is described in US1,394,827. Another approach is to use a razor that includes a saw-shaped hair-cutting member having multiple serrated teeth arranged in rows, wherein the serrated teeth are reciprocated in the extending direction of the rows. An example of a razor with a saw-shaped hair-cutting member using this principle is described in US1,158,741.

[0006] In practice, such solutions are not successful. Specifically, due to the introduction of PTFE-coated razor blades, there is far less dragging during hair cutting, making solutions based on the movement of the cutting edge in its extension direction less relevant. Summary of the Invention

[0007] One object of the present invention is to provide a razor of the type described herein in the "Field of the Invention" section, which allows for hair cutting close to the skin with relatively low hair-cutting force, while generating very little friction, and whose saw-like hair-cutting members have a relatively long lifespan.

[0008] Using the razor and method according to the invention, in each cut, a small amount of hair tissue is sequentially removed from the hair by the moving tips of the saw teeth engaging with the hair. Thus, the top and bottom portions of the hair are separated from each other by multiple subsequent cuts, with only a thin layer of hair tissue removed in each treatment. Because only a small amount of hair tissue is removed each time the saw teeth pass through the hair, and because the hair does not necessarily have to be divided into two parts at once, the cutting force applied to the hair and the corresponding reaction force causing drag are much smaller compared to cutting the hair individually by a single cut (such as by means of a non-reciprocating razor blade with a straight cutting edge). Specifically, the invention defines several operational and dimensional parameters of the hair-cutting member (including the average speed of the saw teeth in the local extension direction of the hair-cutting edge and the spacing between the tooth tips) that result in effective shaving while reducing drag, thereby allowing shaving to be performed without wetting and / or lubricating the skin and without subjecting the shaved hair to an uncomfortable level of drag. Because hair is cut by sawing rather than by cutting each hair at once, the hair-cutting blade of the razor according to the invention does not need to be as sharp as the cutting blade in a conventional razor. Furthermore, because the reduced drag force results in slower wear of the hair-cutting blade, the useful shaving performance of the hair-cutting component is maintained over a greater number of shaving stages.

[0009] Other features, effects and details of the invention will become apparent from the detailed description and the accompanying drawings. Attached Figure Description

[0010] Figure 1 This is a perspective view of a first example of a razor according to the present invention;

[0011] Figure 2 yes Figure 1 A schematic perspective view of the drive mechanism of the razor shown;

[0012] Figure 3 yes Figure 1 and Figure 2 A cross-sectional side view of a portion of the razor in use;

[0013] Figure 4 yes Figures 1-3 The diagram shows the hair-cutting blade of the razor, and schematic cross-sectional views of the fine and coarse beard hairs to be cut.

[0014] Figure 5 yes Figures 1-3 A schematic perspective view of the section of the razor's hair-cutting blade in the operating position relative to the skin surface;

[0015] Figure 6 yes Figure 5 A schematic perspective view of a portion of the section shown, at the serrated edge shown, the section is cut off by passing through the serrated edge along a plane perpendicular to the local extension direction of the hair cutting edge.

[0016] Figure 7 This is a schematic cross-sectional view of the hair-cutting blade of the hair-cutting component of a second example of a razor according to the present invention;

[0017] Figure 8 This is a perspective view of a third example of a razor according to the present invention;

[0018] Figure 9 A perspective view of a fourth example of a razor according to the invention; and

[0019] Figure 10 yes Figure 9 A magnified view of part X of the razor shown. Detailed Implementation

[0020] Figures 1-6 A first example of a razor 1 according to the invention is shown. The razor 1 has a support 2 and skin-engaging surfaces 3-6. A hair-cutting member 9 with a hair-cutting blade 10 is provided to cut hairs 7 protruding from the user's skin at a level close to the skin surface 8. The razor 1 also has a rod-shaped handle 11 for holding the razor 1 by hand. The hair-cutting member 9 is mounted to the support 2 at a position relative to the skin-engaging surfaces 3-6 such that when the skin-engaging surfaces 3-6 contact the skin, the hair-cutting blade 10 is exposed to the user's skin surface 8, thereby sawing through the hairs 7 present on the skin. The hair-cutting member 9 is suspended relative to the support 2 to allow movement of the hair-cutting member 9 in the extension direction 12 of the hair-cutting blade 10. In operation, the hair-cutting blade 10 moves along the skin surface 8 while only making slight contact with the skin, as in conventional blade shaving. In this example, the hair-cutting blade 10 is straight, thus having a local extension direction that remains constant along the entire length of the hair-cutting blade 10. As illustrated by another example, the local extension direction of the hair cutting blade can also vary along the length of the hair cutting blade. In the discussion of effects, the term "extension direction of the hair cutting blade" is mentioned. For embodiments in which the extension direction of the hair cutting blade varies along the length of the hair cutting blade, this must be understood as "the local extension direction of the hair cutting blade at the location of the corresponding one or more saw teeth".

[0021] The hair-cutting blade 10 has a plurality of saw teeth 14 arranged (preferably uniformly) along the hair-cutting member 9. In this example, as Figure 4 and Figure 5 As shown in detail, each saw tooth 14 has two tooth tips 16 connected by a concave front cutting edge 15. The front cutting edge 15 of each saw tooth 14 is connected via a corresponding tooth tip 16 to a corresponding one of the two upper cutting edges 29 of the saw tooth 14, and to a corresponding one of the two lower cutting edges 36 of the saw tooth 14. Each saw tooth 14 is arranged along the hair cutting edge 10 for sawing through the hair 7 by movement in the extending direction 12 of the hair cutting edge 10. Figure 5 In the middle, the orientation of 8 on the skin surface 8 x and 8 y Shown as extending in the direction 12 (8) of the hair cutting blade 10 x ) and in the direction perpendicular to the extension direction 12 of the hair cutting blade along the skin surface 8 (8 y Each lower side blade 36 is connected to the side blade 39 of the skin contact surface 40 of the saw tooth 14, as shown. Figure 5 As shown, the side blade 39 extends at a wedge angle 41 relative to the associated upper side blade 29, the wedge angle 41 being smaller than the first tip angle 38 of the tooth tip 16 surrounded by the upper side blade 29 and the lower side blade 36. The wedge angle 41 between the side blade 39 and the associated upper side blade 29 of the skin contact surface 40 is preferably between 10° and 20°, such that when the razor 1 is used, the skin contact surface 40 is substantially in the same plane as the skin surface 8 (in Figure 5 (The direction is defined by 8x and 8y).

[0022] like Figure 2 As shown, the razor 1 includes a drive unit 13 coupled to the hair-cutting member 9 for driving the movement of the hair-cutting member 9 relative to the support member 2, such that the saw teeth 14 move in the extension direction 12 of the hair-cutting blade 10 at an average speed greater than or equal to 10 m / s. In this example, the movement of the saw teeth 14 is a reciprocating movement in the extension direction 12 at the said average speed.

[0023] The thickness of the beard hair 7 is typically in the range of approximately 50 μm (for thin beard hair) to approximately 300 μm (for thick beard hair). Therefore, if the spacing 17 between two consecutive saw teeth 14 (see...) Figure 5If the distance 17 between the tips 16 of the two consecutive saw teeth 14 is greater than 50 μm, then at least the finest beard hair 7B will fit within the intermediate space 30 between the two consecutive saw teeth 14 (saw tooth and the first next saw tooth, or saw tooth and the previous saw tooth). It has been found that if the beard hair 7 is completely trapped in the intermediate space 30 between the saw teeth, the beard hair tends to be moved back and forth by the saw teeth rather than being cut. To avoid fine beard hairs only moving back and forth and being less effectively cut, when the distance 17 between the tips 16 of the two consecutive saw teeth 14 is greater than 50 μm, the depth 18 of the intermediate space 30 between the two (preferably each pair) consecutive saw teeth 14 is preferably less than or equal to 25 μm in the direction perpendicular to the extension direction 12 of the hair cutting edge 10. The depth 18 between the two consecutive saw teeth 14 can be considered to reach as Figure 5 The straight bottom 19 of the intermediate space 30 is shown, but the effective depth can also be determined (limited) by one or more ridges or other protrusions between the continuous saw teeth 14. For example... Figure 4 As shown, even though the depth 18 will be large enough to completely accommodate at least the fine hair 7B, the spacing 17 between the continuous saw teeth 14, which is less than or equal to 50 μm, can still prevent the fine hair 7B from completely entering the intermediate space 30 between the continuous saw teeth 14.

[0024] The spacing 17 between the tips 16 of two consecutive sawing teeth 14 is at most 150 μm, such that for hairs with an average hair diameter, during the movement of the shearing blade 10 along the hair 7A or 7B, before the sawing tooth 14 leaves the hair 7, the next sawing tooth 14 has already entered the groove in the hair 7, and the previous sawing tooth 14 has already cut in the groove. For efficient sawing of fine hairs 7B, it is advantageous that the spacing 17 between the tips 16 of two consecutive sawing teeth 14 is very small; however, it has also been found that if the spacing 17 between the tips 16 of two consecutive sawing teeth 14 is very small, the debris obtained during cutting tends to remain adhered in the intermediate space 30 between the sawing teeth 14. Therefore, the spacing 17 is 20 μm or greater. Moreover, when a large number of sawing teeth 14 engage with the hair 7 simultaneously, the advantage of reduced cutting force can be offset by the large sum of the cutting forces of the individual sawing teeth 14 engaging with the hair 7. The sum of the shearing forces should preferably not exceed 0.007 N to prevent dragging. This is another reason why the spacing of 17 is at least 20 μm.

[0025] To avoid excessive drag while allowing for efficient hair cutting 7, the average speed of the saw teeth 14 in the extension direction 12 of the hair cutting blade 10 is greater than or equal to 10 m / s. Each saw tooth 14 can be considered a small chisel with a given contact stress and lateral movement on the hair, which will cut away hair tissue from the hair. It has been found that in order to effectively saw through the hair, the ratio between the speed of the hair cutting blade 10 in its extension direction and the rate at which the depth of the saw cut slit in the hair increases should be at least about 100. Therefore, in order to be able to shave at an acceptable shaving speed, i.e., the speed of the razor 1 in the shaving direction is at least 100 mm / s, the minimum speed of the hair cutting blade 10 in its extension direction 12 should be greater than 100 × 100 mm / s = 10 m / s.

[0026] The hair-cutting blade 10 is preferably made of tool-grade steel, but the material of the hair-cutting blade 10 is not limited to tool-grade steel. Several methods exist for manufacturing saw blades, such as by chemical etching and laser ablation. However, other methods are also conceivable, such as nickel growth, and combinations of processes such as wire spark etching with mechanical or chemical polishing.

[0027] The front cutting edge 15 and the upper cutting edge 29 of each sawing tooth 14 preferably surround a second tip angle 20 of less than 80° at the tooth tip 16 (e.g., ...). Figure 5 As shown), to ensure sufficient contact stress at the tooth tip 16. Therefore, the second tip angle 20 of the tooth tip 16 between the front cutting edge 15 and each upper cutting edge 29 is preferably less than 80°. The first tip angle 38 of the tooth tip 16 of each sawing tooth 14 between the upper cutting edge 29 and the lower cutting edge 36 is preferably less than 80° and more preferably less than 60°. In order to make the tooth tip 16 sufficiently sharp, the tip radius R of the tooth tip 16 is... TIP (join Figure 5 Preferably, it is equal to or less than 5 μm. Figure 5 The tip radius R of tooth cusp 16 is schematically shown in the diagram. TIP For effective sawing, the cutting edges 15, 29, and 36 preferably have a cutting radius R of 5 μm or less. EDGE Therefore, viewed in a cross-section along a plane perpendicular to the cutting edges 15 and 29, each cutting edge 15 and 29 preferably has a cutting radius R equal to or less than 5 μm. EDGE The cutting edges 15, 29, and 36 preferably have such a cutting radius R at least at the position of the tooth tip 16. EDGE And preferably, until a certain distance from the tooth tip 16. This distance could be, for example, 25%, 50%, or even 100% of the depth 18 of the intermediate space 30. Figure 6 The cutting radius R of the front tooth cutting edge 15 is shown in detail. EDGE .

[0028] To avoid abrasion and dragging along the skin as the saw teeth 14 move, portions of the side blades 39 of the skin contact surface 40, and preferably also the corresponding portions of the side blades 39 adjacent to the skin contact surface 40 with a lower side blade 36, are preferably rounded or beveled, for example to a blade radius greater than 5 μm and preferably greater than 10 μm. The plurality of outer ends of the side blades 39 of the skin contact surface 40 may each be curved to provide a smooth transition to the lower side blade 36 and the lower blade 42 adjacent to the side blades 39 of the skin contact surface 40.

[0029] To further limit skin movement caused by the movement of the hair-cutting member 9 in contact with the skin surface 8 during use, the razor 1 according to this example is equipped with a skin protection member 5, such as... Figure 3 As shown, during use, the hair-cutting member 9 is positioned in a fixed position relative to the support member 2 on the skin-facing side. Consequently, during use, the hair-cutting member 9 is exposed to the skin only in the exposure area 32 between the hair-cutting blade 10 and the edge 33 of the skin protection member 5. The exposure area 32 has a depth d between 100 μm and 500 μm, preferably between 250 μm and 350 μm, in a direction perpendicular to the extension direction 12 of the hair-cutting blade 10. Skin movement caused by the movement of the hair-cutting member 9 reduces the effectiveness of the sawing process, and by exposing the hair-cutting member 9 to the skin only in the relatively small exposure area 32 including the hair-cutting blade 10, skin movement caused by the movement of the hair-cutting member 9 is limited as much as possible. The selected depth d of the exposure area 32 ensures that the hair-cutting blade 10 is sufficiently exposed to the skin, thereby ensuring the sufficient effectiveness of the sawing process when the hair-cutting blade 10 is moved. The skin protection component 5 also limits skin irritation caused by contact between the moving hair-cutting blade 10 and the skin, because the skin protection component 5 reduces the pressure of the hair-cutting blade 10 contacting the skin. The skin-facing surface 34 of the skin protection component 5 may be provided with a friction-reducing coating to reduce skin friction.

[0030] like Figure 5 As shown, each of the saw teeth 14 has a width 21 of less than 75 μm in the extension direction 12 of the hair cutting blade 10, which allows for a large number of tooth tips 16, leaving a given minimum spacing 17 between each consecutive pair of tooth tips 16. For double-edged (double-tipped) saw teeth 14, a width 21 of 20 μm is preferred for optimizing performance while maintaining sufficient tooth strength.

[0031] One or more additional hair-cutting components may be provided in the razor according to the invention to replace the single hair-cutting component 9, wherein all hair-cutting components may be coupled to the same drive mechanism, which is arranged to drive each hair-cutting component to move relative to the support in the extension direction of its hair-cutting blade at an average speed greater than or equal to 10 m / s.

[0032] As previously stated, in the razor 1 according to this example, the movement of the saw teeth 14 in the extension direction 12 of the hair cutting blade 10 is a reciprocating movement.

[0033] To achieve high shaving performance, each saw tooth 14 has two tips 16, such that the saw teeth 14 cut in two directions of movement parallel to the extension direction 12 of the hair-cutting blade 10. Furthermore, the second tip angle 20 of the tips 16 can be less than 80°. Additionally, in this example, the front edge 15 connecting the two tips 16 of the saw teeth 14 is concave. Due to the concave shape of the front edge 15, hair temporarily present between the top of the saw teeth 14 and the skin 8 will not cause the saw teeth 14 to be lifted off the skin 8 to a degree that significantly impairs shaving performance. This is more relevant the thicker the saw teeth 14.

[0034] exist Figure 7 The image shows a second example of a hair-cutting member of a razor according to the invention, with a hair-cutting blade 60. The razor is also configured to shave while the hair-cutting blade 60 reciprocates in its extension direction 12. Each saw tooth 64 has a single tooth tip 66 at the point where two toothed blades 79 intersect. The tip angle 70 of the saw tooth 64 is preferably less than 60° to keep the negative cutting (forward tilt) angle 72 as small as possible, thereby achieving a sufficiently high initial contact stress with the hair 7 to create an initial cut. To obtain sufficient strength, the saw tooth 64 preferably has a base width 73 of at least 20 μm.

[0035] In order for the saw teeth 14 to move in the extension direction 12 of the hair cutting blade at an average speed of at least 10 m / s, the reciprocating movement of the saw teeth 14 preferably has a stroke length between 1 mm and 30 mm, and the reciprocating movement preferably has a frequency equal to or greater than 330 Hz. The combination of the stroke length and the frequency produces the desired average speed of at least 10 m / s.

[0036] The drive mechanism 13 can be, for example, a driven resonance system that induces and maintains resonant movement of the mass spring system relative to the body. An example of such a driven resonance system is... Figure 2The diagram schematically illustrates the hair-cutting member 9, which can be housed within the housing portion 24 of the handle 11. The hair-cutting member 9 is movably guided relative to the support 2 in the extension direction 12 by means of a plurality of guide members 35 and is attached to a first end of a leaf spring 25, the opposite second end of which is fixedly connected to the support 2. The leaf spring 25 has such stiffness that the mass combination of the hair-cutting member 9 to which it is attached is "resonant" at its intrinsic frequency (e.g., 7700 Hz at a stroke length of 1.3 mm) matching the desired frequency of the reciprocating movement of the hair-cutting member 9 in its extension direction 12. Instead of using a motor rotating at the same rpm or a very high-frequency linear motor, a rotatable drive drum 37 carrying a plurality of alternately polarized magnets 26, 27, and an antimagnet 28 attached to the leaf spring 25 can be used to drive the movement at such a high frequency. In operation, the antimagnet 28 is attracted or pushed away by the passing magnets 26, 27 during the rotation of the drum 37. In this example, the excitation frequency of the leaf spring 25 is six times the number of revolutions per unit time of the drum 37. This multiplication of the excitation frequency allows for the use of a standard motor to achieve a high excitation frequency. Furthermore, the excitation frequency can be the bass note of the intrinsic frequency of the mass spring system formed by the leaf spring 25 and the hair-cutting member 9.

[0037] exist Figure 8 The image shows a third example of a razor 101 according to the invention. In this example, the hair-cutting blade 110 of the hair-cutting member 109 has a local extension direction that varies along the hair-cutting blade 110. Therefore, the direction of movement of the saw teeth of the hair-cutting blade 110 varies along the hair-cutting blade 110. Specifically, each saw tooth moves at its position in the associated local extension direction 112 of the hair-cutting blade 110. Specifically, in this example, the saw teeth of the hair-cutting blade 110 move in a rotational manner in the corresponding local extension direction of the hair-cutting blade. For this purpose, the hair-cutting member 109 is provided in the form of a circular saw blade with a circular hair-cutting blade 110. However, other ways of creating continuous movement in a single direction are also conceivable, such as band saws and chainsaw systems. In all these systems, the hair-cutting blade can also be driven to move in a reciprocating manner in principle.

[0038] In a design that is compact enough for everyday use and easy to carry while traveling, the hair cutting blade 110 of the hair cutting member 109 preferably has a diameter between 5 mm and 75 mm in order to obtain a sufficiently long operable section of the hair cutting blade 110.

[0039] The drive mechanism for rotatably driving the hair-cutting member 109 is preferably arranged such that the hair-cutting member 109 rotates about a rotation axis at a speed of at least 2500 rpm. This speed, as described above, combined with the diameter of the hair-cutting blade 110, is suitable for achieving the required average speed of at least 10 m / s for the saw teeth.

[0040] exist Figure 9 and Figure 10 The image shows a fourth example of a razor 151 according to the invention, wherein the hair-cutting blade 160 of the hair-cutting member 159 has serrated teeth (in... Figure 9 and Figure 10 (Not visible separately) Movement in the local extension direction 162 of the hair-cutting blade 160 is a continuous rotational movement in a single direction. Rotational movement can follow any rotational trajectory, such as in a chainsaw or flexible band saw. In this example, the hair-cutting member 159 is provided in the form of a single circular saw blade to achieve the rotational movement of the hair-cutting blade 160. To protect the skin from damage or irritation by the rotating hair-cutting member 159, a skin protection member 178 is provided, which has comb teeth 175 with skin-engaging surfaces 155 that contact the skin during shaving. Between these comb teeth 175, there are openings 176 in which the skin can protrude to a position close to or slightly in contact with the hair-cutting blade 160.

[0041] In other instances, hair cutting is achieved by sawing through the hair at or near the skin surface. Specifically, the saw teeth of the hair-cutting blade 160 do not interact with the comb teeth 175 of the skin-protecting member 178, thus not functioning as a pair of hair-cutting teeth that operate in conjunction with conventional electric shavers and trimmers, in which the moving cutting member moves relative to and operates in conjunction with the fixed cutting member.

[0042] Although the invention has been described and illustrated in detail in the foregoing description and drawings, such description and illustrations should be considered exemplary and / or illustrative rather than restrictive; the invention is not limited to the disclosed embodiments.

[0043] Several features have been described as part of the same or separate embodiments. However, it should be understood that the scope of the invention also includes embodiments having all or some of these features, rather than specific combinations of features embodied in the embodiments.

[0044] By studying the accompanying drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement other variations of the disclosed embodiments in practicing the claimed invention. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plurality. A single processor or other unit can implement the functions of several items recited in the claims. For the purpose of clarity and concise description, features that are part of the same or separate embodiments are disclosed herein; however, it should be understood that the scope of the invention can include embodiments having a combination of all or some of the disclosed features. The fact that certain measures are recited in mutually different dependent claims does not mean that combinations of these measures cannot be advantageously used. Any reference numerals in the claims should not be construed as limiting the scope.

Claims

1. A razor comprising: Support components; Skin-to-skin interface surface; as well as A hair cutting member having a plurality of saw teeth arranged along the hair cutting edge of the hair cutting member, each saw tooth having a tooth tip and a tooth edge interconnected via the tooth tip; The hair cutting component mentioned above: - The hair-cutting blade is mounted to the support in a position relative to the skin-engaging surface such that when the skin-engaging surface contacts the skin, the hair-cutting blade is exposed to the user's skin to cut through the hair present on the skin by means of the saw teeth; as well as -Suspended relative to the support to allow each corresponding saw tooth to move at the position of the corresponding saw tooth in the local extension direction of the hair cutting blade; Its features are: The razor includes a drive mechanism coupled to the hair-cutting member, the drive mechanism being used to drive the hair-cutting member relative to the support, such that the saw teeth move in the respective local extension direction of the hair-cutting blade at an average speed greater than or equal to 10 m / s; and The distance between the tips of the two consecutive sawing teeth is between 20 μm and 150 μm.

2. The razor according to claim 1, wherein if the distance between the tips of two consecutive sawing teeth is greater than 50 μm, the depth of the intermediate space between the two consecutive sawing teeth in a direction perpendicular to the local extension direction of the hair cutting blade is less than or equal to 25 μm.

3. The razor according to claim 1 or 2, wherein the cutting edge of the saw teeth surrounds a tip angle of less than 80° at the tooth tip.

4. The razor according to claim 1 or 2, wherein the tips of the sawing teeth have a tip radius equal to or less than 5 μm.

5. The razor according to claim 1 or 2, wherein the cutting edge of the saw teeth has a cutting radius equal to or less than 5 μm at least at the position of the tooth tip.

6. The razor according to claim 1 or 2 further includes a skin protection member, which is arranged in a fixed position relative to the support on the skin-facing side of the hair-cutting member during use, such that during use, the hair-cutting member is exposed to the skin only in an exposed area between the hair-cutting blade and the edge of the skin protection member, the exposed area having a depth between 100 μm and 500 μm in a direction perpendicular to the local extension direction of the hair-cutting blade.

7. The razor of claim 6, wherein the depth of the exposed area is between 250 μm and 350 μm.

8. The razor according to any one of claims 1, 2 and 7, wherein the saw teeth have a width of less than 75 μm in the local extension direction of the hair cutting blade.

9. The razor according to any one of claims 1, 2 and 7, wherein at least one of the sawing teeth has two tooth tips interconnected by a concave front cutting edge of the sawing tooth.

10. The razor according to any one of claims 1, 2 and 7, wherein the drive device is arranged to move the hair cutting member such that the saw teeth move in a reciprocating motion in the respective local extension direction of the hair cutting blade.

11. The razor of claim 10, wherein the reciprocating movement has a stroke length between 1 mm and 30 mm and a frequency equal to or greater than 330 Hz.

12. The razor according to any one of claims 1, 2, 7 and 11, wherein the drive device is arranged to move the hair cutting member such that the saw teeth move in a rotational direction in a unidirectional manner in the respective local extension direction of the hair cutting blade.

13. The razor of claim 12, wherein the hair-cutting blade is circular and has a diameter between 5 mm and 75 mm, and wherein the drive device is arranged to cause the hair-cutting member to rotate about a rotation axis at a speed of at least 2500 rpm.

14. A method for shaving hair protruding from the skin surface, comprising: - Provide a razor according to any one of the preceding claims; as well as - The hair-cutting component of the razor is driven relative to the support member of the razor, such that the saw teeth of the hair-cutting component move at an average speed greater than or equal to 10 m / s in the corresponding local extension direction of the hair-cutting blade of the hair-cutting component.

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