Electric shaver

Abstract

To provide an electric shaver capable of uniformly and deeply shaving a face and a peripheral portion having a complicated shape by preventing the face and the peripheral portion from being left unshaved.SOLUTION: An electric shaver 1 according to the present invention includes, in a main body 3, a rotary-type blade unit 4 having a first outer blade 11 and a first inner blade 12 that rotates while being in sliding contact with an inner surface of the first outer blade, a reciprocating-type blade unit 5 having a curved arc-shaped second outer blade 21 and a second inner blade 22 that reciprocates while being in sliding contact with an inner surface of the second outer blade, and a motor M. In the reciprocating-type blade unit 5, the second outer blade 21 is provided in the main body 3 so as to be movable up and down. The rotary-type blade unit 4 can be tilted to a position where an upper surface 11a of the first outer blade 11 is parallel to tangent planes P1 and P2 that are in contact with a farthest portion 11c from the second outer blade 21 in the upper surface 11a of the first outer blade 11 and the upper surface 21a of the second outer blade 21, regardless of a position of a top portion 21b of the second outer blade 21.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an electric shaver. [Background technology]

[0002] Conventional electric shavers can be broadly divided into rotary electric shavers equipped with a rotary blade unit and reciprocating electric shavers equipped with a reciprocating blade unit (sometimes called a foil blade unit). Electric shavers equipped with both of these blade units have also been developed (see Patent Document 1: JP 2013-070749 A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-070749 Summary of the Invention [Problem to be solved by the invention]

[0004] As exemplified in Patent Document 1, rotary electric razors generally have the characteristic that they are easy to use for shaving long or curly beards, but have difficulty in providing a close shave. On the other hand, reciprocating electric razors have the characteristic that they are difficult to use for shaving long or curly beards, but have the characteristic that they are easy to use for a close shave. For this reason, the electric razor exemplified in Patent Document 1 is equipped with both a rotary blade unit and a reciprocating blade unit in an attempt to utilize the advantages of each.

[0005] However, after extensive research by the inventor, it became clear that simply having both a rotary blade unit and a reciprocating blade unit would not be enough to adequately shave the complexly shaped facial hair and surrounding areas such as under the chin (around the neck) and under the nose. Specifically, it would leave some hair unshaved, particularly on long or curly beards, resulting in an insufficient shave and an inadequate clean finish. [Means for solving the problem]

[0006] The present invention has been made in view of the above circumstances, and aims to provide an electric shaver that can achieve a clean finish by preventing long or unruly beards from being left unshaved evenly across the entire target area, even when used on the face and surrounding areas which have complex shapes.

[0007] One embodiment of the electric shaver comprises a rotary blade unit having an annular or disc-shaped first outer cutter and a first inner cutter that rotates while sliding against the inner surface of the first outer cutter, a reciprocating blade unit having a curved, arc-shaped second outer cutter and a second inner cutter that reciprocates while sliding against the inner surface of the second outer cutter, and a motor, all of which are mounted on a main body. The reciprocating blade unit is mounted on the main body so that the second outer cutter can move up and down, and the rotary blade unit is mounted on the main body so that the top surface of the first outer cutter can be tilted to a position parallel to the tangent plane that connects the top surface of the second outer cutter and the part of the top surface of the first outer cutter farthest from the second outer cutter, regardless of the position of the top of the second outer cutter.

[0008] This allows the outer cutter to fit tightly against the complex shape of the face and surrounding areas, prevents long or unruly beards from being left unshaved, and allows for a uniform, deep shave.

[0009] For example, two sets of rotary blade units may be provided, and the two sets may be arranged so that the line connecting the centers of the two sets in a plan view is parallel to the longitudinal direction of the reciprocating blade unit.

[0010] For example, two sets of the reciprocating blade units may be provided, and the reciprocating blade units may be arranged in series so that their longitudinal center lines are aligned on the same line in a plan view.

[0011] Preferably, the cutting blade further includes a flexible arm for transmitting the driving force of the motor to the first inner blade. [Effects of the Invention]

[0012] This invention improves the fit of the outer blade to the complex shapes of the face and surrounding areas, preventing long or unruly beard hair from being left unshaved and enabling a uniform, deep shave across the entire target area, resulting in a clean finish. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic view (perspective view) showing an example of an electric shaver according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram (exploded perspective view) showing an example of a drive mechanism of the electric shaver shown in FIG. [Figure 3] FIG. 3 is a schematic view (perspective view) showing an example of an outer cutter and an inner cutter of the rotary blade unit of the electric shaver shown in FIG. [Figure 4] FIG. 4 is a schematic view (perspective view) showing an example of an outer cutter and an inner cutter of the reciprocating blade unit of the electric shaver shown in FIG. [Figure 5] FIG. 5 is an explanatory diagram illustrating the operation of the rotary blade unit and the reciprocating blade unit 5 of the electric shaver shown in FIG. [Figure 6] FIG. 6 is an explanatory diagram illustrating the state of use of the electric shaver shown in FIG. [Figure 7] FIG. 7 is an explanatory diagram illustrating the state of use of the electric shaver shown in FIG. [Figure 8] FIG. 8 is an explanatory diagram illustrating the state of use of the electric shaver shown in FIG. [Figure 9] FIG. 9 is a schematic view (perspective view) showing another example of the electric shaver according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram (side view) showing an example of an electric shaver according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] (First embodiment) A first embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a schematic diagram (perspective view) showing an example of an electric shaver 1 according to this embodiment. Fig. 2 is a schematic diagram (exploded perspective view) showing an example of a drive mechanism for the electric shaver 1. For ease of explanation, arrows may be used in the drawings to indicate up / down, left / right, and front / rear directions. In all drawings used to explain the embodiment, members having the same functions are denoted by the same reference numerals, and repeated explanations of such members may be omitted.

[0015] The electric shaver 1 according to this embodiment includes a main body 2. An upper portion of the main body 2 constitutes a head unit 3 (in the present application, the term "main body" may be used as a general term including the head unit). The head unit 3 may be configured as an integral unit that cannot swing relative to the main body 2, as shown in FIG. 1, or may be configured as a separate unit that can swing relative to the main body 2 (not shown).

[0016] Inside the main body 2 are a motor M (one in this embodiment) that drives the inner blade (described below), a battery (not shown) that supplies power to the motor M, and a control unit (not shown) that performs a series of controls, such as driving the rotation of the motor M. The battery may be either a storage battery or a dry cell battery. Also, a switch (not shown) for turning the power on and off is provided on the front of the main body 2.

[0017] Meanwhile, a plurality of blade units are provided in the head portion 3. For example, two sets (or one or three or more sets) of rotary blade units 4 and one set (or two or more sets) of reciprocating blade units 5 are provided. The reciprocating blade units 5 may be structured to be supported at a position on the main body 2 below the head portion 3 (not shown).

[0018] 1, the two rotary blade units 4 are arranged so that the first outer cutters 11 (described later) constituting the units have the same diameter and the upper surfaces are at the same height, and the line connecting their centers in a plan view is parallel to the longitudinal direction of the reciprocating blade unit 5 (the reciprocating direction of the second inner cutter 22 (described later)). Furthermore, each reciprocating blade unit 5 is arranged so that the second outer cutter 21 (described later) constituting the unit has a length that extends across both ends of the two first outer cutters 11.

[0019] First, we will explain the rotary blade unit 4. The rotary blade unit 4 according to this embodiment includes an annular (single row or two or more rows) first outer cutter 11 and a first inner cutter 12 that rotates while sliding against the inner surface of the first outer cutter 11. The first outer cutter may also be disk-shaped (so-called dome-shaped) (not shown).

[0020] The first outer cutter 11 and the first inner cutter 12 are attached to the cutter frame 10 in a mutually combined state. The cutter frame 10 is attached to the head unit 3 via a spring member (not shown) or the like so as to be swingable back and forth and left and right and movable up and down.

[0021] The first outer cutter 11 according to this embodiment is formed as an integral structure by stamping, drawing, bending, and other processes using a flat metal material such as a stainless steel alloy having a predetermined thickness (relatively thicker than the second outer cutter 21, described below). The first outer cutter 11 has a generally cup-like shape with its periphery bent downward. Multiple hair inlets 13 are formed through the outer surface, i.e., the top surface 11a, extending from a portion of the side surface 11b (or only the top surface 11a), allowing hairs to enter (for simplicity's sake, only some of the hair inlets 13 are marked with reference numerals). This allows hairs entering the hair inlets 13 to be pinched between their lower ends and the tip of the first inner cutter 12 (cutting blade 14), described below, for cutting. The hair inlets 13 may have a variety of shapes, such as radial slits, round holes, or a combination thereof.

[0022] The first inner blade 12 according to this embodiment is made of a flat metal plate of a predetermined thickness, such as a stainless alloy, and is stamped, bent, or otherwise processed to form a plurality of cutter blades 14, with portions of the flat plate portion 12a raised relative to the plate surface (for simplicity of illustration, only some of the cutter blades 14 are labeled). As an example, as shown in Figure 3, the cutter blades 14 are formed so that their front end faces are inclined toward the front in the direction of rotation. Therefore, the upper edge on the front side in the direction of rotation becomes the cutting edge.

[0023] The cutter blade 14 according to this embodiment has the same radial width from the top to the bottom, and is, for example, a generally rectangular columnar shape with a radial width of about 1 mm, a circumferential width of about 0.5 mm, and a length (length from the base to the cutting edge) of about 3 mm. However, the cutter blade 14 is not limited to this size and shape.

[0024] In this embodiment, the first outer cutter 11 has a radially two-row annular configuration, and the corresponding cutter blades 14 of the first inner cutter 12 are also arranged in two radially two-row configuration, a so-called dual track configuration. However, this is not limited to this, and one row or three or more rows may also be used (not shown).

[0025] The blade also includes a drive force transmission member (flexible arm in this embodiment) 16 that transmits the drive force of the motor M to the first inner cutter 12 via the gear unit 42 to rotate it (see FIG. 2). As an example, the first inner cutter 12 is fixed to an inner cutter holder 15, and the drive force transmission member (flexible arm) 16 is connected to the lower part of the inner cutter holder 15 via a drive pin or the like (not shown) (or directly). Note that the "flexible arm" is, for example, a coil spring-shaped member made of a metal material, and is a rotational force transmission member whose length and inclination are variable within a predetermined range (however, the present invention is not limited to this configuration).

[0026] The sliding contact between the first inner cutter 12 and the first outer cutter 11 may be achieved by the flexible arm 16, or by a spring member compressed on a drive pin (not shown).

[0027] Next, we will explain the reciprocating blade unit 5. The reciprocating blade unit 5 according to this embodiment includes a curved, arc-shaped second outer cutter 21 and a second inner cutter 22 that reciprocates while sliding against the inner surface of the second outer cutter 21.

[0028] The second outer cutter 21 and the second inner cutter 22 are attached to the cutter frame 20 in a mutually combined state via a spring member (not shown) or the like so that they can swing back and forth and left and right and move up and down. Furthermore, the cutter frame 20 is attached to the head part 3 or a position below the head part 3 (or may be attached to both) so that it can move up and down.

[0029] The second outer cutter 21 according to this embodiment is made of a flat metal plate of a predetermined thickness (relatively thinner than the first outer cutter 11) made of stainless steel alloy or the like, curved into an arc (arch shape) and fixed to the outer cutter base 23. Here, "arc shape" refers to an inverted U-shaped cross section taken along a plane perpendicular to the longitudinal direction. Numerous hair inlet openings 19 are formed through the upper surface 21a of the second outer cutter 21 (specifically, the surfaces of the apex 21b and peripheral portion 21c of the curved shape) to allow hairs to enter (for simplicity of illustration, only some of the hair inlet openings 19 are marked with reference numerals). This allows hairs entering the hair inlet openings 19 to be sandwiched between their lower ends and the tip of the second inner cutter 22 (cutting blade 24), which will be described later, for cutting. The hair inlet openings 19 may have various shapes, such as a mesh shape or a round hole shape.

[0030] The second inner cutter 22 according to this embodiment is made of a flat metal plate of a predetermined thickness, such as a stainless steel alloy, and is curved into an arcuate shape, i.e., an inverted U-shape in cross section perpendicular to the longitudinal direction, and fixed to the inner cutter base 25. As an example, the second inner cutter 22 has a number of arcuate cutter blades 24 integrally formed therewith (for simplicity of illustration, only some of the cutter blades 24 are labeled). The upper surface 22a of the second inner cutter 22 (cutter blades 24) (specifically, the surfaces of the apex portion 22b and peripheral portion 22c of the arcuate curved shape) is curved so as to slide against the lower surface of the second outer cutter 21 (the inner surfaces of the apex portion 21b and peripheral portion 21c).

[0031] The blade also includes a drive force transmission member (vibrator) 26 that transmits the drive force of the motor M to the second inner cutter 22 via a gear section 42 to vibrate (reciprocate) the second inner cutter 22 (see FIG. 2). In this embodiment, the rotational motion of the motor M is converted into reciprocating motion of the vibrator 26 via a crankshaft 27. As an example, the second inner cutter 22 is fixed to the inner cutter holder 25, and the drive force transmission member (vibrator) 26 is connected to the lower part of the inner cutter holder 25 via a support member or the like (not shown) (or directly). Note that the configuration is not limited to the above, and the vibrator 26 (i.e., the second inner cutter 22) may be reciprocated by a linear motor or the like (not shown).

[0032] The sliding contact of the second inner cutter 22 with the second outer cutter 21 may be achieved by compressing a spring member on the support member (not shown) or by other configurations (not shown).

[0033] Next, the operation of the electric shaver 1 according to this embodiment will be described. Figure 5 is an explanatory diagram illustrating the operation of each blade unit 4, 5. Figures 6 to 8 are explanatory diagrams illustrating the electric shaver 1 in use.

[0034] 5A, the state in which the top portion 21b of the second outer cutter 21 (when not tilted or moving up and down) of the reciprocating blade unit 5 and the top surface 11a of the first outer cutter 11 (when not tilted or moving up and down) of the rotary blade unit 4 are at the same height is defined as the "basic state." With respect to this "basic state," the reciprocating blade unit 5 is configured to be able to move up and down between a position where the top portion 21b of the second outer cutter 21 is higher than the top surface 11a of the first outer cutter 11 and a position where it is lower than the top surface 11a of the first outer cutter 11.

[0035] On the other hand, with respect to the above-mentioned "basic state," the rotary blade unit 4 is configured so that the upper surface 11a of the first outer cutter 11 can be tilted to a position parallel to a tangent plane that contacts the upper surface 21a of the second outer cutter 21 and the farthest part 11c of the upper surface 11a of the first outer cutter 11 from the second outer cutter 21, regardless of the position of the apex 21b of the second outer cutter 21 of the reciprocating blade unit 5. Specifically, as shown in Fig. 5B, when the apex 21b of the second outer cutter 21 is in a position higher than the upper surface 11a of the first outer cutter 11, the upper surface 11a of the first outer cutter 11 can be tilted to a position parallel to a tangent plane P1 that contacts the farthest part 11c of the second outer cutter 21 and the upper surface 21a of the second outer cutter 21. 5C, when the top portion 21b of the second outer cutter 21 is positioned lower than the upper surface 11a of the first outer cutter 11, the upper surface 11a of the first outer cutter 11 can be tilted to a position parallel to a tangent plane P2 that contacts the farthest portion 11c from the second outer cutter 21 and the upper surface 21a of the second outer cutter 21. Note that "parallel" as used here is not limited to strict parallelism, but also includes some degree of deviation.

[0036] As mentioned above, by providing a flexible arm 16 that transmits the driving force of the motor M to the first inner blade 12, it is possible to realize a configuration in which multiple sets (two sets in this embodiment) of rotary blade units 4 can tilt individually (without being linked to each other).

[0037] Next, a specific use example, when used on the cheeks, will be described with reference to FIG. 6. The cheeks are the largest area of ​​the face and its surrounding areas that are subject to shaving. For this reason, various electric razors have been developed that include multiple rotary blade units (e.g., two or three sets) or multiple reciprocating blade units (e.g., two to six sets) to shave more quickly and efficiently than single-blade razors. However, as mentioned above, while rotary electric razors are good at shaving long or curly beards, they have difficulty achieving a close shave. On the other hand, reciprocating electric razors are good at shaving close, but they have difficulty shaving long or curly beards. In contrast, the electric shaver 1 according to this embodiment includes both rotary blade units 4 (two sets) and reciprocating blade unit 5 (one set) as multiple blade units, preventing long or curly beards from being left unshaved and enabling a uniformly deep shave across the entire target area. When shaving the cheeks, it is preferable to use the blade units 4 and 5 in the position shown in Figure 5C. This allows you to shave in a comfortable position without raising your elbows too much. However, you may also use the blade units in the positions shown in Figures 5A and 5B as appropriate.

[0038] As mentioned above, there has been a problem in that it is difficult to shave thoroughly on the complexly shaped face and surrounding areas such as under the chin (around the neck) and under the nose. However, the electric shaver 1 according to this embodiment can solve this problem.

[0039] Specifically, use under the chin will be described with reference to FIG. 7. Conventional electric shavers, especially those equipped with multiple blade units, have difficulty in fitting the blades (outer cutters) tightly to the complexly shaped area under the chin. This inevitably forces the user to turn their face up when using the razor. In contrast, the electric razor 1 according to this embodiment, as shown in FIG. 7A, uses the blade units 4 and 5 in the position shown in FIG. 5B, allowing the first outer cutter 11 and second outer cutter 21 (particularly the first outer cutter 11) to be easily fitted tightly to the area under the chin without forcing the user to turn their face up. Therefore, the first outer cutter 11 can shave without leaving any long or unruly hair, while the second outer cutter 21 can provide a close, clean shave. By appropriately using the blade units 4 and 5 in the position shown in FIG. 5C, as shown in FIG. 7B, the area under the chin can be cleanly and evenly shaved from front to back.

[0040] Next, use under the nose will be described with reference to FIG. 8. With conventional electric razors, especially those equipped with multiple blade units, it has been difficult to fit the blades (outer cutters) closely to the narrow, complexly shaped area under the nose. In contrast, with the electric razor 1 according to this embodiment, as shown in FIG. 8A, by using the blade units 4 and 5 in the position shown in FIG. 5C, the first outer cutter 11 can be easily fitted closely to the area under the nose. Furthermore, as shown in FIG. 8B, by using the blade units 4 and 5 in the position shown in FIG. 5B, the second outer cutter 21 can be easily fitted closely to the area under the nose. Therefore, the first outer cutter 11 can shave without leaving any long or unruly hair, and the second outer cutter 21 can provide a close, clean shave.

[0041] (Second embodiment) Next, an electric shaver 1 according to a second embodiment of the present invention will be described. The basic configuration is the same as that of the first embodiment, so differences will be mainly described. Fig. 10 is a schematic diagram (side view) showing an example of an electric shaver 1 according to this embodiment. Here, arrow A in Fig. 10 indicates the movement direction (up and down movement direction) of the reciprocating blade unit 5. The scale next to arrow A indicates a position set as a moderation for the movement of the reciprocating blade unit 5. For example, the reference position (center position) is set to position 0, and the reciprocating blade unit 5 is set to be movable in two steps upward (position 1, position 2) and two steps downward (position -1, position -2) (however, this is not limited to this). In this embodiment as well, the rotary blade unit 4 is provided on the main body 2 so that the upper surface 11a of the first outer cutter 11 can tilt to a position parallel (not limited to strictly parallel) to a tangent plane that contacts the upper surface 21a of the second outer cutter 21 and the farthest part 11c from the second outer cutter 21 on the upper surface 11a of the first outer cutter 11, regardless of the position (five positions in this embodiment) of the top portion 21b of the second outer cutter 21 of the reciprocating blade unit 5. This configuration is the same as in the first embodiment described above.

[0042] In this embodiment, a motor (first motor) M1 that drives the first inner blade 12 of the rotary blade unit 4 and a motor (second motor) M2 that drives the second inner blade 22 of the reciprocating blade unit 5 are provided separately, and the rotation speed can be set individually (note that if there are multiple units in each of the units 4 and 5, they may be provided with one common motor, or multiple motors corresponding to the number of units may be provided).

[0043] Furthermore, in this embodiment, the speeds of the inner blades 12, 22, i.e., the rotation speeds of the first motor M1 of the rotary blade unit 4 and the second motor M2 of the reciprocating blade unit 5, are set to change in response to (linked with) the movement position of the reciprocating blade unit 5. For example, they are set as shown in Table 1 below (but are not limited to this).

[0044] [Table 1]

[0045] Specifically, if the position where the first outer cutter 11 and the second outer cutter 21 are aligned in the axial direction of the head part 3, i.e., in the direction perpendicular to the movement direction (up and down movement direction) of the reciprocating blade unit 5, is defined as the neutral position (position 0), when the second outer cutter 21 is in a position higher than the neutral position (positions 1 and 2), the rotation speed of the second motor M2 remains the same but the rotation speed of the first motor M1 is set to a lower rotation speed than the rotation speed of the first motor M1 in the neutral position. Also, when the second outer cutter 21 is in a position lower than the neutral position (positions -1 and -2), the rotation speed of the first motor M1 remains the same but the rotation speed of the second motor M2 is set to a higher rotation speed than the rotation speed of the second motor M2 in the neutral position.

[0046] This configuration allows shaving to be performed at the optimum position (optimum rotation speed of each motor M1, M2, i.e., optimum speed of each inner blade 12, 22) depending on the part of the face that has a complex shape. As an example, the skin on the cheeks is relatively firm and does not sag easily, so by selecting positions -1 and -2, shaving that emphasizes sharpness can be performed. As another example, the skin under the chin is prone to sagging, so by selecting positions 1 and 2, shaving that minimizes damage to the skin can be performed.

[0047] As explained above, the electric shaver 1 according to the present invention can prevent long or unruly beards from being left unshaved on the complexly shaped face and surrounding areas, and can achieve a clean, even shave over the entire target area.

[0048] The present invention is not limited to the above-described embodiment and various modifications are possible without departing from the spirit and scope of the present invention. For example, a configuration including two rotary blade units 4 and two reciprocating blade units 5 is also possible. Specifically, as shown in FIG. 9 , two sets of reciprocating blade units 5 are provided so that at least the second outer cutters 21 have the same width (width in the lateral direction) and the top surfaces are at the same height. The two sets of reciprocating blade units 5 are arranged in series so that the longitudinal centerlines of the second outer cutters 21 (i.e., lines parallel to the longitudinal direction and perpendicular to the lateral direction at their centers) are aligned in a plan view. This configuration further enhances the ability of the second outer cutters 21 of the reciprocating blade unit 5 to follow the skin, thereby further enhancing the effects of the present invention described above. [Explanation of symbols]

[0049] 1 electric razor 2 Main unit 3 Head 4 Rotary blade unit 5 Reciprocating blade unit 11 First outer blade 12 First inner blade 21 Second outer blade 22 Second inner blade

Claims

1. a rotary blade unit having an annular or disc-shaped first outer cutter and a first inner cutter that rotates while sliding on the inner surface of the first outer cutter; a reciprocating blade unit having a curved arc-shaped second outer cutter and a second inner cutter that reciprocates while sliding against the inner surface of the second outer cutter; An electric shaver having a main body including a motor, The reciprocating blade unit includes: The second outer cutter is provided on the main body so as to be movable up and down, The rotary blade unit includes: No matter where the top of the second outer cutter is located, The upper surface of the first outer cutter is provided on the main body so as to be tiltable to a position parallel to a tangent plane that contacts the upper surface of the second outer cutter and the farthest part of the upper surface of the first outer cutter from the second outer cutter. An electric shaver characterized by:

2. Two sets of the rotary blade units are provided, and the line connecting the centers of the rotary blade units in a plan view is arranged parallel to the longitudinal direction of the reciprocating blade units.

2. The electric shaver according to claim 1,

3. A flexible arm is provided to transmit the driving force of the motor to the first inner blade.

3. The electric shaver according to claim 2, wherein

4. Two sets of the reciprocating blade units are provided, and are arranged in series so that the center lines of the respective longitudinal directions are aligned on the same line when viewed from above. The electric shaver according to any one of claims 1 to 3, characterized in that

5. The rotary blade unit includes a first motor for driving the first inner blade, and a second motor for driving the second inner blade of the reciprocating blade unit.

2. The electric shaver according to claim 1,

6. The rotation speed of the first motor and the rotation speed of the second motor are set to change depending on the vertical position of the reciprocating blade unit.

6. The electric shaver according to claim 5,

Images