Rotary electric razor

Abstract

We offer a rotary electric razor with a simple design that improves cutting performance while minimizing damage to the skin. [Solution] The rotary electric razor 1 according to the present invention comprises an outer blade 22 having a beard entry opening 22c and an inner blade 42 that rotates while sliding against the inner surface 22b of the outer blade 22. The inner blade 42 has a first small blade 42A that rises from the base surface 42Ca and a second small blade 42B that rises from the base surface 42Ca. The first small blade 42A has a first front cutting edge 42Ax ​​formed at the front end 42Ab in the direction of rotation F of the upper end 42Aa, and the second small blade 42B has a second front cutting edge 42Bx formed at the front end 42Bb in the direction of rotation F of the upper end 42Ba. The rake angle α1 of the first front cutting edge 42Ax ​​is formed at a relatively small angle, and the rake angle α2 of the second front cutting edge 42Bx is formed at a relatively large angle.

Description

Technical Field

[0001] The present invention relates to a rotary electric shaver.

Background Art

[0002] For example, a rotary electric shaver is known which includes an outer blade having a plurality of beard inlets and an inner blade that rotates while slidingly contacting the inner surface of the outer blade, and cuts the beard that has entered the beard inlet (see Patent Document 1: Japanese Patent Application Laid-Open No. 2007-135991).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The conventional rotary electric shaver exemplified in Patent Document 1 can improve the sharpness of the beard, but there have been cases where the inner blade damages the skin and causes stubble. Therefore, the inventor has developed a rotary electric shaver having an inner blade that can rotate in the forward rotation direction and the reverse rotation direction, and having a mode with good sharpness and a mode that suppresses damage to the skin and reduces stubble (see Patent Document 2: Japanese Patent Application Laid-Open No. 2015-223315).

[0005] However, the conventional rotary electric shaver exemplified in Patent Document 2 has a problem that the mechanism becomes complicated in order to rotate the inner blade in the forward rotation direction and the reverse rotation direction.

Means for Solving the Problems

[0006] This invention has been made in view of the above circumstances, and aims to provide a rotary electric razor with a simple structure that can improve cutting performance while suppressing damage to the skin.

[0007] A rotary electric shaver according to one embodiment is a rotary electric shaver comprising a blade unit having an outer blade having a plurality of beard entry points and an inner blade that rotates while sliding against the inner surface of the outer blade, wherein the inner blade has a plurality of first small blades that stand upright from the base surface and a plurality of second small blades that stand upright from the base surface, wherein the first small blade has a first front end cutting edge formed at the front end of the upper end facing the direction of rotation, which is capable of cutting beards that have entered the beard entry points, and the second small blade has a second front end cutting edge formed at the front end of the upper end facing the direction of rotation, which is capable of cutting beards that have entered the beard entry points, wherein the rake angle α1 of the first front end cutting edge is formed at a relatively small angle, and the rake angle α2 of the second front end cutting edge is formed at a relatively large angle.

[0008] According to this, the first small bevel makes it possible to achieve a cutting edge (first front cutting edge) that prioritizes improved sharpness, and the second small bevel makes it possible to achieve a cutting edge (second front cutting edge) that prioritizes damage suppression while not being significantly inferior in sharpness compared to the first front cutting edge.

[0009] Furthermore, it is preferable that the first small blade is arranged on the outer circumference of the base surface, the second small blade is arranged on the inner circumference of the base surface, and the outer blade has a first outer blade provided at a position corresponding to the first small blade and a second outer blade provided at a position corresponding to the second small blade, with the upper surface of the first outer blade formed at a relatively high position and the upper surface of the second outer blade formed at a relatively low position.

[0010] Furthermore, it is preferable that the angle α1 is formed to be 30° ≤ α1 ≤ 90° and the angle α2 is formed to be 70° ≤ α2 ≤ 90°.

[0011] Furthermore, it is preferable that the outer blade has a relatively narrow circumferential width for the whisker entry point provided on the first outer blade, and a relatively wide circumferential width for the whisker entry point provided on the second outer blade.

[0012] Furthermore, it is preferable that the outer blade has an outer blade cover fitted at the radial center position, and that the upper surface of the outer blade cover is formed at a lower position than the upper surface of the second outer blade, and that when the difference in height dimension between the upper surface of the first outer blade and the upper surface of the second outer blade is D1, and the difference in height dimension between the upper surface of the second outer blade and the upper surface of the outer blade cover is D2, then D2 ≤ D1 × 3.

[0013] Furthermore, it is preferable that the outer blade has an outer blade cover fitted at the radial center position, and that the upper surface of the outer blade cover is formed at a position lower than the upper surface of the first outer blade and higher than the upper surface of the second outer blade.

[0014] Furthermore, it is preferable that the first small blade is configured to rise at an acute angle from the base surface in the direction of rotation, and the second small blade is configured to rise at an acute angle from the base surface in the direction opposite to the direction of rotation.

[0015] Furthermore, it is preferable that the first and second blades are formed in a symmetrical shape in the front-to-back direction along the rotational direction. [Effects of the Invention]

[0016] According to the present invention, it is possible to realize a rotary electric razor with a simple configuration in which the inner blade rotates in only one direction, which can improve cutting performance while suppressing damage. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 is a perspective view showing an example of a rotary electric razor according to an embodiment of the present invention. [Figure 2]FIG. 2 is an exploded perspective view showing an example of the head portion of the rotary electric shaver of FIG. 1. [Figure 3] FIG. 3 is a perspective view showing an example of the inner blade of the rotary electric shaver of FIG. 1. [Figure 4] FIG. 4A is a side view showing an example of the first small blade of the inner blade of FIG. 3, and FIG. 4B is an enlarged view of the upper part of the first small blade of FIG. 4A. [Figure 5] FIG. 5A is a side view showing an example of the second small blade of the inner blade of FIG. 3, and FIG. 5B is an enlarged view of the upper part of the second small blade of FIG. 5A. [Figure 6] FIG. 6 is a perspective view showing an example of the outer blade of the rotary electric shaver shown in FIG. 1. [Figure 7] FIG. 7 is a plan view showing an example of the outer blade shown in FIG. 6. [Figure 8] FIG. 8 is an enlarged view of part VIII in FIG. 7. [Figure 9] FIG. 9 is a sectional view taken along line IX-IX in FIG. 7. [Figure 10] FIG. 10 is a perspective view showing an example of the outer blade cover of the rotary electric shaver shown in FIG. 1.

MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view (schematic view) showing an example of a rotary electric shaver 1 according to the present embodiment. Further, FIG. 2 is an exploded perspective view (schematic view) showing an example of the head portion 3 of the rotary electric shaver 1. In all the drawings for explaining the embodiments, members having the same function are denoted by the same reference numerals, and repeated explanations thereof may be omitted.

[0019] As shown in Figures 1 and 2, the rotary electric shaver 1 according to this embodiment has an outer blade 22 through which numerous beard entry points 22c are formed, and an inner blade 42 that rotates while sliding against the inner surface 22b of the outer blade 22, and is a rotary electric shaver that cuts the beards X that enter the beard entry points 22c with the outer blade 22 and the inner blade 42. Although the explanation will use a rotary electric shaver having three sets of blade units 6, each consisting of an outer blade 22 and an inner blade 42, as an example, the invention is not limited to this.

[0020] In Figure 1, reference numeral 2 denotes the main body, which comprises a roughly cylindrical case 10. A switch 16 for turning the power on and off and switching between operating modes is provided on the front of this case 10.

[0021] Meanwhile, the case 10 houses a motor that rotates the inner blade 42, a battery that supplies power to the motor, and a control unit that performs a series of controls such as rotating the motor (none of which are shown).

[0022] As shown in Figure 2, the head unit 3 comprises a head case 32 connected to and held on the upper part of the case 10 of the main body unit 2, a blade frame 30 placed over the head case 32 from above, a drive mechanism (not shown) housed in the inner bottom of the head case 32, and three sets of blade units 6 held in the blade frame 30 so as to be slightly movable up and down and swingable. Here, each blade unit 6 comprises a substantially disc-shaped outer blade 22 and an inner blade 42 that rotates while sliding in contact with the inner surface 22b of the outer blade 22. The three sets of blade units 6 are arranged to form a triangle in plan view. Although this embodiment is an example in which there are three sets of blade units 6 as described above, the basic configuration can be considered similarly even if there are other than three sets of blade units.

[0023] Here, the outer blade 22 is formed with multiple beard entry points 22c (for example, slit-shaped, round-shaped, etc., but not limited to these) that penetrate axially (i.e., in the same direction as the axis of rotation of the inner blade 42), and the inner blade 42 cuts the beards X that enter these beard entry points 22c. In other words, the upper surface (outer surface) 22a of the outer blade 22 is the shaving surface that contacts the user's skin, and the beard entry points 22c open into this upper surface 22a. For example, the upper surface 22a is formed as an annular plane. The outer blade 22 also has a shape in which the periphery is bent downward, and an outer blade ring 24 is fitted to this periphery. A stopper ring 26 is fitted to the inner circumference of the outer blade ring 24 to fix the outer blade 22 to the outer blade ring 24.

[0024] Meanwhile, the inner blade 42 is fixed to the inner blade holder 44, and a recess is formed in the lower part of the inner blade holder 44 into which the upper end of the inner blade drive shaft (not shown), which is connected to the output shaft of the motor, is fitted. The inner blade 42 is held pivotably toward the outer blade 22 by an inner blade receiver 46 fitted into the outer blade ring 24, and these together form three sets of independent blade units 6.

[0025] With the above configuration, the blade unit 6 is assembled so that the inner blade 42 (small blade 42A, described later) comes into contact with the outer blade 22 (inner surface 22b, described later). In this state, by rotating the inner blade 42, the hairs X that have entered the hair entry point 22c can be cut by the cutting edge of the inner blade 42 (small blade 42A).

[0026] Switch 16 is an operating switch for switching the power on and off. For example, a push-button switch can be used, and it can be set so that when switch 16 is pushed once, the power is turned on and the motor starts, and when it is pushed again (a total of two times), the power is turned off and the motor stops. However, the configuration is not limited to this, and a configuration that further includes a mode for switching the motor speed between high speed and low speed may also be used. In addition, a slide switch or the like may be used instead of a push-button switch (not shown).

[0027] Next, the configuration of the inner blade 42 will be explained in detail using Figures 3 to 5. Figure 3 is a perspective view (top view) of the inner blade 42. Figure 4A is a side view of the first sub-blade 42A (described later) of the inner blade 42, and Figure 4B is an enlarged view of the upper part of the first sub-blade 42A. Figure 5A is a side view of the second sub-blade 42B (described later) of the inner blade 42, and Figure 5B is an enlarged view of the upper part of the second sub-blade 42B. In each figure, the direction of rotation of the inner blade 42 is indicated by the direction of arrow F. Also, for the sake of simplification of the figures, only some of the sub-blades 42A and 42B are labeled with symbols.

[0028] For example, the inner blade 42 is formed as a single unit using a flat metal material made of stainless steel alloy, through die-cutting and bending by press working. In this way, the inner blade 42 can be formed with a simple structure and with fewer steps, thereby reducing parts costs and assembly costs. However, it is not limited to a single unit structure.

[0029] The inner blade 42 according to this embodiment is provided with a plurality of small blades formed by raising a portion of the metal plate 42C relative to the base surface (upper surface) 42Ca. Specifically, on the base surface (upper surface) 42Ca, a plurality of first small blades 42A are provided on the outer circumference, and a plurality of second small blades 42B are provided on the inner circumference, resulting in a so-called dual-track configuration. However, it is not limited to this, and other configurations such as a triple-track with three rows of small blades may also be used (not shown).

[0030] Here, the first small blade 42A is configured to stand upright from the base surface 42Ca at an acute angle (angle of uprightness β1) in the direction of rotation F. On the other hand, the second small blade 42B is configured to stand upright from the base surface 42Ca at an acute angle (angle of uprightness β2) in the direction opposite to the direction of rotation F.

[0031] The first and second small blades 42A and 42B are, for example, roughly prismatic in shape with a rectangular cross-section having one side (radial side) of about 1 mm and the other side (circumferential side) of about 0.5 mm, and are formed with lengths L1 and L2 of about 3 mm. However, they are not limited to these dimensions and shapes. Furthermore, shortening lengths L1 and L2 can improve the rigidity of the small blade 42A, preventing bending and vibration during operation, and thus improving cutting performance.

[0032] The first small blade 42A has a first front cutting edge 42Ax ​​formed at its front end 42Ab in the direction of rotation F of its upper end 42Aa, which is capable of cutting hairs X that have entered the hair entry point 22c. The second small blade 42B has a second front cutting edge 42Bx formed at its front end 42Bb in the direction of rotation F of its upper end 42Ba, which is capable of cutting hairs X that have entered the hair entry point 22c. In this embodiment, the rake angle α1 of the first front cutting edge 42Ax ​​is formed at a relatively small (i.e., relatively sharp) angle, and the rake angle α2 of the second front cutting edge 42Bx is formed at a relatively large (i.e., relatively not sharp) angle.

[0033] With the above configuration, the first small blade 42A makes it possible to realize a blade tip (first front blade tip 42Ax) that prioritizes improved cutting performance. Furthermore, the second small blade 42B makes it possible to realize a blade tip (second front blade tip 42Bx) that prioritizes damage suppression and whose cutting performance is not significantly inferior to that of the first front blade tip 42Ax. Therefore, even with a configuration in which the inner blade 42 rotates in only one direction (direction F) (i.e., a configuration without a reverse rotation function), it is possible to provide an electric razor 1 that can improve cutting performance while suppressing damage.

[0034] Furthermore, as an additional feature, if the rotation speed of the inner blade 42 could be set to multiple levels, users would be able to select a shaving method that is more suitable according to their preferences, beard condition (length, volume, etc.), and skin condition (damage level, sensitivity, etc.).

[0035] Here, the inventors conducted diligent research regarding the specific angle settings for the inner blade 42 (first sub-blade 42A, second sub-blade 42B) and confirmed that using an inner blade 42 in which angle α1 is formed to 30° ≤ α1 ≤ 90° and angle α2 is formed to 70° ≤ α2 ≤ 90° provides a good balance between improved cutting performance and damage suppression. The angles β1 and β2 can be set appropriately within the range of 45° to 90°.

[0036] Furthermore, with respect to the inner blade 42, the first small blade 42A and the second small blade 42B can be configured to have a symmetrical shape in the front-to-back direction along the rotation direction F. That is, the first small blade 42A can be configured such that a first rear end cutting edge 42Ay is provided at the rear end 42Ac of the upper end 42Aa in the direction of rotation F, and is formed to be symmetrical with the second front end cutting edge 42Bx of the second small blade 42B. In addition, the second small blade 42B can be configured such that a second rear end cutting edge 42By is provided at the rear end 42Bc of the upper end 42Ba in the direction of rotation F, and is formed to be symmetrical with the first front end cutting edge 42Ax ​​of the first small blade 42A.

[0037] With this configuration, both the first small blade 42A and the second small blade 42B have a cutting edge formed at the rear end in the direction of rotation F. Therefore, by adding a function to reverse the rotation of the inner blade 42, it is possible to increase the number of modes with different balances between improved cutting performance and damage reduction, providing a variety of shaving methods to suit the user.

[0038] The configuration of the inner blade 42 according to a typical embodiment has been described above, but the configuration is not limited to this, and the following configurations may also be used. Specifically, the first small blade 42A and the second small blade 42B, which are provided in the inner and outer rings, may both be positioned at an acute angle toward the direction of rotation, or they may both be positioned at an acute angle toward the opposite direction of rotation (neither of which are shown in the diagram). In these configurations, the respective lengths L1 and L2 can be adjusted (for example, in the case where the first small blade 42A and the second small blade 42B are both positioned at an acute angle toward the direction of rotation, L1 > L2) to satisfy the aforementioned rake angle relationship, i.e., α1 < α2. Therefore, it is possible to improve cutting performance while suppressing damage.

[0039] Next, the configuration of the outer blade 22 will be explained in detail using Figures 6 to 10. Figure 6 is a perspective view (top view) of the outer blade 22. Figure 7 is a plan view of the outer blade 22. Figure 8 is an enlarged view of section VIII in Figure 7. Figure 9 is a cross-sectional view taken along line IX-IX in Figure 7. Figure 10 is a perspective view (bottom view) of the outer blade cover 28. For the sake of simplification of the figures, only some of the hair entry points 22c are labeled with symbols.

[0040] As an example, the outer blade 22 is formed as a single unit using a flat metal material made of stainless steel alloy, through processes such as die-cutting by press working, drawing, and bending, and has a roughly cup-shaped form with its periphery bent downwards. In this embodiment, an outer blade cover 28 made of resin material is fixed (fitted) into a through hole 22D formed at the radial center of the outer blade 22.

[0041] On the other hand, as shown in Figure 10, the outer blade cover 28 is formed in a roughly cup shape using a resin material, and a cylindrical portion 28a is provided at the bottom, into which a convex portion 44a, located at the radial center of the inner blade 42, engages. In addition, the outer wall portion of the cylindrical portion 28a is provided with a number of projections 28b that are fitted into the through hole 22D of the outer blade 22 and crimped and fixed. As a result, the outer blade cover 28 (in this case, the cylindrical portion 28a) is fitted together with the center of the outer blade 22 coinciding. A decorative plate 29 made of a metal material such as stainless steel alloy is fitted over the upper part of the outer blade cover 28, but this may be omitted.

[0042] As described above, this embodiment has a so-called dual-track configuration, and the outer blade 22 has a double annular structure in plan view, corresponding to the configuration of the inner blade 42. Specifically, the outer blade 22 is composed of a first outer blade 22A provided at a position corresponding to the first small blade 42A and sliding in contact with each other, a second outer blade 22B provided at a position corresponding to the second small blade 42B and sliding in contact with each other, and an annular groove 22C provided between them (at an intermediate position in the radial direction).

[0043] Both the first outer blade 22A and the second outer blade 22B are equipped with multiple hair follicle entry points 22c. For example, the first outer blade 22A has a configuration in which slit-shaped (elongated hole-shaped) hair follicle entry points 22c1 with a relatively long radial length and slit-shaped (elongated hole-shaped) hair follicle entry points 22c2 with a relatively short radial length are arranged alternately in the circumferential direction. On the other hand, the second outer blade 22B has a configuration in which a group of slit-shaped (elongated hole-shaped) hair follicle entry points 22c3 and a group of round-hole-shaped hair follicle entry points 22c4 are arranged alternately in the circumferential direction. However, the configuration is not limited to these, and the shape, arrangement, etc., can be set in various ways.

[0044] As shown in Figure 8, the outer blade 22 according to this embodiment is formed such that the circumferential width W1 (referring to the maximum width, which in this case is the width at the radial center) of the elongated beard entry opening 22c1 provided in the first outer blade 22A is relatively narrow, and the circumferential width W2 (referring to the maximum width, which in this case is the width at the radial center) of the elongated beard entry opening 22c3 provided in the second outer blade 22B is relatively wide. With this configuration, a close shave is possible, especially on the inner circumferential side, i.e., by the second outer blade 22B and the second secondary blade 42B, and damage can also be suppressed by the shape of the second front end blade tip 42Bx of the second secondary blade 42B. In this embodiment, the circumferential widths of the beard entry openings 22c1 and 22c2 are formed to be the same.

[0045] Furthermore, as shown in Figure 9, the outer blade 22 according to this embodiment is formed such that the upper surface 22a1 of the first outer blade 22A is at a relatively high position, and the upper surface 22a2 of the second outer blade 22B is at a relatively low position (in Figure 9, the difference in height dimension is indicated as D1). With this configuration, a close shave is possible, especially on the inner circumference side, i.e., by the second outer blade 22B and the second secondary blade 42B, and damage can also be suppressed by the shape of the second front end blade tip 42Bx of the second secondary blade 42B. As a modification, the upper surface 22a1 and the upper surface 22a2 may be configured to be at the same height.

[0046] Furthermore, in this embodiment, the upper surface 28c (shown by a dashed line in Figure 9) of the outer blade cover 28 (including the decorative plate 29 in this case) is formed to be lower than the upper surface 22a2 of the second outer blade 22B (in Figure 9, the difference in height dimension is shown as D2). With this configuration, the outer blade cover 28 can suppress skin penetration and reduce damage, and in particular, the degree of damage reduction can be adjusted by setting the position of the upper surface 28c. For example, as in this embodiment, by setting the upper surface 28c to be lower than the upper surface 22a2 of the second outer blade 22B, it is possible to achieve a high-level balance between improved cutting performance and damage reduction.

[0047] In the inventor's research, it was first confirmed that providing an outer blade cover 28 suppresses and reduces damage to the skin. This is thought to be because the outer blade cover 28 mitigates the contact of the outer blade 22 with the skin. However, it was confirmed that if the upper surface 28c of the outer blade cover 28 (including the decorative plate 29 in this case) is too high, for example, if the upper surface 28c is set higher than the upper surface 22a1 of the first outer blade 22A, shaving itself becomes insufficient. Based on this finding, a configuration in which the upper surface 28c of the outer blade cover 28 is set lower than the upper surface 22a1 of the first outer blade 22A is preferable. On the other hand, it was confirmed that if the upper surface 28c of the outer blade cover 28 is set significantly lower than the upper surface 22a2 of the second outer blade 22B, the above-mentioned skin contact mitigation effect of the outer blade cover 28 cannot be sufficiently obtained, and damage to the skin cannot be suppressed or reduced. Therefore, in order to prevent the upper surface 28c of the outer blade cover 28 from being too low, further research was conducted on the optimal position setting, and it was found that a configuration in which D1 (the difference in height between the upper surface 22a1 of the first outer blade 22A and the upper surface 22a2 of the second outer blade 22B) and D2 (the difference in height between the upper surface 22a2 of the second outer blade 22B and the upper surface 28c of the outer blade cover 28) is D2 ≤ D1 × 3 is preferable, and a configuration in which D2 ≤ D1 × 2 is even more preferable. With this configuration, the following problems can be solved. Specifically, as mentioned above, the circumferential width W2 of the beard entry point 22c3 of the second outer blade 22B is set wider than the circumferential width W1 of the beard entry point 22c1 of the first outer blade 22A, which makes the skin on the second outer blade 22B side more susceptible to damage. However, by providing the above height difference, this problem can be solved, that is, the damage can be suppressed or reduced.

[0048] As a variation, the upper surface 28c of the outer blade cover 28 (including the decorative plate 29 in this case) may be set to be higher than the upper surface 22a2 of the second outer blade 22B (not shown). That is, the upper surface 28c is set to be lower than the upper surface 22a1 of the first outer blade 22A and higher than the upper surface 22a2 of the second outer blade 22B. With this configuration, compared to the above configuration, the effect of preventing skin penetration and reducing damage by the outer blade cover 28 can be further enhanced.

[0049] As explained above, with the rotary electric razor 1 according to the present invention, even with a simple configuration in which the inner blade 42 rotates in only one direction (i.e., does not have a mechanism for rotating in both forward and reverse directions), it is possible to achieve both damage suppression and improved cutting performance.

[0050] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the scope of the invention. In particular, although the explanation has been given using a rotary electric razor having three sets of outer and inner blade combinations (blade units) as an example, it is not limited to this. That is, it may also be applied to a rotary electric razor (not shown) having one or two sets of the above-described blade units. [Explanation of Symbols]

[0051] 1. Rotary electric razor 2 Main body 3. Head section 6-blade unit 22 Outer blade 22A 1st outer blade 22B 2nd outer blade 42 inner blade 42A 1st small blade 42B 2nd small blade

Claims

1. A rotary electric razor comprising a blade unit having an outer blade with multiple beard entry points and an inner blade that rotates while sliding against the inner surface of the outer blade, The inner blade has a plurality of first small blades that rise from the base surface and a plurality of second small blades that rise from the base surface, The first small blade has a first front end cutting edge formed at its front end in the direction of rotation of the upper end, which is capable of cutting hairs that have entered the hair entry point. The second small blade has a second front end cutting edge formed at its upper end in the direction of rotation, which is capable of cutting hairs that have entered the hair entry point. The rake angle α1 of the first front cutting edge is formed at a relatively small angle, and the rake angle α2 of the second front cutting edge is formed at a relatively large angle. A rotary-type electric razor characterized by [feature].

2. The first small blade is positioned on the outer circumference of the base surface, The second small blade is positioned on the inner circumference side on the base surface, The outer blade has a first outer blade provided at a position corresponding to the first small blade and a second outer blade provided at a position corresponding to the second small blade, wherein the upper surface of the first outer blade is formed at a relatively high position and the upper surface of the second outer blade is formed at a relatively low position. A rotary electric razor according to claim 1, characterized by the following:

3. The angle α1 is formed to be 30° ≤ α1 ≤ 90°, and the angle α2 is formed to be 70° ≤ α2 ≤ 90°. A rotary electric razor according to claim 1 or claim 2, characterized by the above.

4. The outer blade is formed such that the circumferential width of the whisker entry point provided on the first outer blade is relatively narrow, and the circumferential width of the whisker entry point provided on the second outer blade is relatively wide. A rotary electric razor according to claim 2, characterized by the following:

5. The outer blade has an outer blade cover fitted at the radial center, and the upper surface of the outer blade cover is formed at a lower position than the upper surface of the second outer blade. The configuration is such that D2 ≤ D1 × 3, where D1 is the difference in height between the upper surface of the first outer blade and the upper surface of the second outer blade, and D2 is the difference in height between the upper surface of the second outer blade and the upper surface of the outer blade cover. A rotary electric razor according to claim 2, characterized by the following:

6. The outer blade has an outer blade cover fitted at the radial center, and the upper surface of the outer blade cover is formed at a position lower than the upper surface of the first outer blade and higher than the upper surface of the second outer blade. A rotary electric razor according to claim 2, characterized by the following:

7. The first small blade is configured to rise at an acute angle from the base surface in the direction of rotation, The second small blade is configured to rise at an acute angle from the base surface in the direction opposite to the direction of rotation. A rotary electric razor according to claim 1 or claim 2, characterized by the above.

8. The first and second blades are formed in a symmetrical shape in the front-to-back direction along the rotational direction. A rotary electric razor according to claim 7, characterized by the following:

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