JP6347988B2 - Rotary electric razor - Google Patents

Description

  The present invention relates to a rotary electric shaver.

  For example, the rotary described in Patent Document 1 includes an outer blade on which a plurality of reciprocating entrances are formed, and an inner blade that rotates while being in sliding contact with the lower surface of the outer blade, and cuts the reed that has entered the retreat entrance An electric shaver is known.

JP 2007-135991 A

  Here, the rotary electric razor exemplified in Patent Document 1 can improve the sharpness of the wrinkles, but on the other hand, there is an example in which the skin is scratched by the inner blade and tingling occurs.

  The present invention has been made in view of the above circumstances, has an inner blade that has a simple configuration and can be rotated in a forward rotation direction and a reverse rotation direction, and a user arbitrarily selects a use mode defined by the rotation direction of the inner blade. An object of the present invention is to provide a rotary electric razor that is provided with a normal mode that is sharp and has a sharpness reduction mode that causes little damage to the skin.

  As an embodiment, the above-described problem is solved by a solution as disclosed below.

The disclosed rotary electric razor is a rotary electric razor comprising a blade unit having an outer blade in which a plurality of reciprocating entrances are formed and an inner blade that rotates while being in sliding contact with the lower surface of the outer blade, The inner blade has a plurality of small blades, and is provided so as to be rotatable in a forward rotation direction and a reverse rotation direction. The small blade has a part of a metal plate that is part of the metal plate with respect to the plate surface. The first cutting edge capable of cutting the scissors that have entered the scissors entrance is formed on the tip end side in the positive rotation direction by being formed so that the angle α on the front side in the positive rotation direction becomes an acute angle. In addition, in the surface on the distal end side in the reverse rotation direction, a concave portion having a shape rolled from the upper end surface toward the lower end is provided, so that the forward entrance is entered on the distal end side in the reverse rotation direction. The second cutting edge that can cut the scissors By switching the rotation direction of the inner blade, the first mode for cutting the scissors with the first blade tip and the second mode for cutting the scissors with the second blade tip are switched. And a switching means.

  According to this, by switching the rotation direction of the inner blade having two kinds of angles at the cutting edge, it has a function that becomes a mode that prioritizes sharpness at the time of forward rotation, and a mode that prioritizes reduction of scratching at the time of reverse rotation Can do. Therefore, the user can select the mode giving priority to sharpness and the mode giving priority to mitigation by changing the rotation direction of the inner blade by operating the switching means. As described above, since the mode can be freely selected by one unit, it is possible to cope with both sharpness priority and reduction of tingling, and convenience is improved.

  According to the present invention, the inner blade has a simple configuration and is rotatable in the forward rotation direction and the reverse rotation direction, and the user can arbitrarily select a use mode defined by the rotation direction of the inner blade, A rotary electric shaver having a normal mode with good sharpness and a tingling reduction mode with little damage to the skin can be realized.

It is the schematic (perspective view) which shows the example of the rotary electric shaver which concerns on embodiment of this invention. FIG. 2 is a schematic view (disassembled perspective view) showing an example of a head portion of the rotary electric shaver shown in FIG. It is the schematic (perspective view) which shows the example of the inner blade of the rotary electric shaver shown in FIG. It is the schematic which shows the example of the small blade of the inner blade shown in FIG. It is a block diagram centering on the control part of the rotary electric shaver shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view (perspective view) showing an example of a rotary electric shaver 1 according to this embodiment. FIG. 2 is a schematic view (disassembled perspective view) showing an example of the head portion 3 of the rotary electric shaver 1. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof may be omitted.

  As shown in FIGS. 1 and 2, the rotary electric shaver 1 according to the present embodiment is slid on the outer blade 22 through which a large number of reciprocating entrances (described later) 22 c are formed, and on the lower surface of the outer blade 22. This is a rotary electric shaver that has an inner blade 42 that rotates while in contact with the outer blade 22 and the inner blade 42 that cuts the rod that has entered the blade entrance 22c. In addition, although the rotary electric shaver which has three sets of the blade units 6 comprised including the outer blade 22 and the inner blade 42 is mentioned as an example, it demonstrates, It is not limited to this.

  In FIG. 1, reference numeral 2 denotes a main body portion, which includes a substantially cylindrical case 10. A switch button 16 for turning on / off the power and switching a use mode is provided on the front surface of the case 10, and a display unit 17 including an LED lamp for indicating a remaining battery charge is provided below the switch button. It has been.

  On the other hand, inside the case 10 is housed a motor 60 that rotationally drives the inner blade 42, a battery that supplies electric power to the motor, and a controller 50 that performs a series of controls such as rotational driving of the motor 60 (FIG. 5). Shows an example of a block diagram). As an example, the control unit 50 includes a switching circuit 52 that switches the polarity of the motor 60, and a signal output unit that outputs a signal for switching the polarity of the motor 60 to the switching circuit 52 (for example, a microcomputer or the like). IC chip) 54 is provided.

  As shown in FIG. 2, the head portion 3 includes a head case 32 that is connected to and held by the upper portion of the case 10 of the main body portion 2, a blade frame 30 that is covered by the head case 32 from above, and a head case 32. A drive mechanism (not shown) housed in the inner bottom of the blade and three blade units 6 held on the blade frame 30 so as to be slightly movable up and down and swingable. Here, each blade unit 6 includes a substantially disk-shaped outer blade 22 and an inner blade 42 that rotates while sliding on the lower surface (inner surface) of the outer blade 22. Further, the three sets of blade units 6 are arranged in a triangular shape in plan view. Note that, as described above, the present embodiment is an example in which three sets of blade units 6 are provided, but the basic configuration may be considered in the same manner even when the number of blade units is other than three sets.

  Here, the outer blade 22 is formed with a large number of radial slits 22c serving as a retraction inlet penetrating in the axial direction (that is, the same direction as the axial direction of the rotation axis of the inner blade). Is configured to be cut by the inner blade 42. That is, the outer cutter 22 has a configuration in which the upper surface 22a is a shaving surface that comes into contact with the user's skin and the slit 22c is opened to the upper surface (shaving surface) 22a. As an example, the upper surface (shaving surface) 22a is formed in an annular plane. The outer cutter 22 has a shape in which the periphery is bent downward, and the outer cutter ring 24 is fitted to the periphery. A stopper ring 26 is fitted on the inner periphery of the outer cutter ring 24 to fix the outer cutter 22 to the outer cutter ring 24.

  On the other hand, the inner cutter 42 is fixed to the inner cutter holder 44, and a concave portion in which an upper end of an inner cutter drive shaft (not shown) connected to the motor output shaft is fitted to the lower portion of the inner cutter holder 44. Is formed. The inner blade 42 is swingably held on the outer blade 22 side by an inner blade receiver 46 fitted in the outer blade ring 24, thereby forming three sets of independent blade units 6.

  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 (lower surface 22b described later). In this state, the inner blade 42 is rotationally driven to cut the scissors that have entered the scissors entrance (slit) 22c with the cutting edge of the inner blade 42 (small blade 42A) (details will be described later).

  Here, as a characteristic configuration of the present embodiment, the inner blade 42 is provided so as to be rotatable in the forward rotation direction and the reverse rotation direction. Furthermore, by switching the rotation direction of the inner blade 42 by the switching means, the first mode in which the cutting edge is cut with the blade edge (the first blade edge described later) in the forward rotation direction and the distal side in the reverse rotation direction. It is set as the structure which can switch to the 2nd mode which cut | disconnects a scissors with the blade edge (2nd blade edge mentioned later).

  The switching means according to the present embodiment includes the switch button 16 and the control unit 50. For example, a signal corresponding to the switching operation (operation position) of the switch button 16 is sent to the switching circuit 52 directly or via the signal output unit 54, and the switching circuit 52 switches the polarity of the motor 60. The rotation direction of 42 is switched.

  More specifically, an electrical contact between the switch button 16 and the control unit 50 is provided, and a signal is output to the switching circuit 52 directly or via the signal output unit 54 by a switching operation of the switch button 16. Accordingly, power is supplied from the battery to the motor (energization / non-energization), and the polarity of the motor is switched. In the motor, the rotation direction of a rotation shaft (not shown) serving as an output shaft is switched between a normal rotation direction (one direction) and a reverse rotation direction (the other direction) opposite to the rotation direction. As an example, the rotation speed of the rotation shaft of the motor in forward rotation and reverse rotation is set to the same rotation speed. However, you may set to different rotation speed.

  As an example, the switch button 16 is provided with an operation switch capable of reciprocating between three positions in order to switch on / off the power source and use mode. For example, when the switch button is in the first position, the power is turned on and driven in the first mode (“normal mode” described later), the power is turned off in the second position and the driving is stopped, and the power is turned on in the third position. Can be set to be on in the second mode ("scratch reduction mode" described later). Thus, in the present embodiment, the motor is switched from the stop state to the drive state by switching the switch button 16 from the second position to the first position (or the third position). The polarity of the motor is switched by switching the switch button 16 between the first position and the third position.

  As a modified example of the switch button, a push button type operation switch may be provided (not shown). For example, when the switch button is pressed once, the power is turned on to drive in the first mode (“normal mode” to be described later), and when the switch button is pressed again (twice in total), the mode is switched. Then, when driving in the second mode (the “scratch mitigation mode” described later) and the switch button is pressed once more (three times in total), the power is turned off and the drive stops and returns to the initial state. It can also be set as follows.

  Next, the configuration of the inner blade 42 will be described in detail with reference to FIGS. FIG. 3 is a perspective view showing an example of the inner blade. 4 (a) is an enlarged view of the small blade 42A of the inner blade 42, and FIG. 4 (b) is an enlarged view of a portion A in FIG. 4 (a). In each figure, regarding the rotation direction of the inner blade 42, the direction of forward rotation is indicated by the direction of arrow F, and the direction of reverse rotation is indicated by the direction of arrow R.

  As shown in FIG. 3, the inner blade 42 according to the present embodiment includes a plurality of small blades 42 </ b> A in which a part of a metal plate is raised with respect to the plate surface 42 </ b> B (for simplification of the drawing). , Only some blades are marked). As an example, the small blade 42A stands up so that the angle α of the front side (standing angle) in the rotation direction with respect to the plate surface 42B of the metal plate is an acute angle (45 ° ≦ α <90 ° in this embodiment). Is formed.

  In the present embodiment, the inner blade 42 is formed as an integral structure by performing die cutting and bending by press working using a metal plate made of stainless steel. As described above, the inner blade 42 can be formed with a simple structure and with fewer steps, so that it is possible to reduce component costs and assembly costs. However, it is not limited to an integral structure.

  The small blade 42A according to the present embodiment has, for example, a substantially prismatic shape having a rectangular cross section with one side of about 1 [mm] and the other side of about 0.5 [mm], and a length L1 of 3 [mm]. ] Is formed. However, it is not limited to this dimension shape. Note that shortening the length L1 can improve the rigidity of the small blade 42A, and can prevent the occurrence of bending or vibration during operation, thus improving the sharpness.

  Further, the small blade 42A has a first cutting edge 42a capable of cutting the scissors that have entered the scissors entrance (slit) 22c formed on the front end side in the forward rotation direction, and has a scissors on the front end side in the reverse rotation direction. A second cutting edge 42b capable of cutting the scissors that have entered the entrance (slit) 22c is formed.

  More specifically, in the small blade 42A, the upper end edge defined by the front-side surface (hereinafter referred to as “first end surface”) 42d in the forward rotation direction and the upper end surface 42c cuts the ridge in the forward rotation direction. 1 cutting edge 42a. On the other hand, the upper end edge defined by the tip side surface (hereinafter referred to as “second end surface”) 42e in the reverse rotation direction and the upper end surface 42c becomes the second cutting edge 42b for cutting the scissors in the reverse rotation direction. In the present embodiment, the second end face 42e is provided with a concave portion 42f that is shaped toward the lower end from the upper end surface 42c, and the second cutting edge 42b is defined by the concave portion 42f and the upper end surface 42c. The

  Here, the shape of the concave portion 42f is not particularly limited. For example, the entire concave portion 42f may be formed in a curved surface shape as in the example shown in FIG. 4, or may be configured by a plurality of flat surfaces and a curved surface connecting them. It is good also as a shape (not shown). The method for forming the recess 42f is not particularly limited, but can be formed by various processing methods such as press processing, cutting (grinding) processing, electric discharge processing, ECM (electrolytic processing), and the like.

  In the present embodiment, the small blade 42A is configured such that the upper end surface 42c connecting the first blade edge 42a and the second blade edge 42b is in sliding contact with the lower surface 22b of the outer blade 22. However, it is not limited to this. If the concave portion 42f is formed large (deeply) in the circumferential direction, the area of the upper end surface 42c can be reduced, and the sliding resistance can be reduced.

  Here, the angle (rake angle) of the first blade edge 42a of the small blade 42A is defined as an angle β1, and the angle (rake angle) of the second blade edge 42b is defined as an angle β2. In the present embodiment, the angle β1 is formed to be an angle relatively smaller than the angle β2, and the angle β2 is formed to be an angle relatively larger than the angle β1, so that a small angle having two kinds of angles (rake angle) is formed. The blade 42A is realized. As an example, the angle β1 is formed to be 40 ° ≦ β1 ≦ 60 °, and the angle β2 is formed to be 75 ° ≦ β2 ≦ 85 °. In the present embodiment, the configuration in which the recess 42f is provided allows the rake angle β2 of the second cutting edge 42b to be an acute angle even when the standing angle α of the small blade 42A is an acute angle. Therefore, the scissors can be cut also at the second cutting edge 42b. In addition, the rake angle β2 of the second cutting edge 42b can be set to an arbitrary angle by appropriately setting the shape of the recess 42f.

  With this configuration, when the inner blade 42 is rotated forward (rotated in the direction F), the first blade edge 42a of the small blade 42A cuts the ridge X that has entered the forward entrance (slit) 22c of the outer blade 22. be able to. That is, the scissors X can be cut with a cutting edge (here, the first cutting edge 42a) having a relatively sharp rake angle. Therefore, the effect of improving sharpness is obtained. However, since it has a sharp rake angle, the damage to the user's skin becomes relatively large, and the possibility of causing bruising is increased. The mode in which the inner blade 42 is rotated forward in this way and the ridge X is cut by the first cutting edge 42a of the small blade 42A is referred to as a “normal mode (first mode)”.

  On the other hand, if the inner cutter 42 is rotated in the reverse direction (rotated in the R direction), the second cutter tip 42b of the small cutter 42A can cut the scissors X that have entered the thrust inlet (slit) 22c of the outer cutter 22. it can. That is, the scissors X can be cut with a cutting edge having a rake angle that is not relatively sharp (here, the second cutting edge 42b). Therefore, the damage to the user's skin becomes relatively small, and the possibility of causing tingling is reduced. However, since it has a rake angle that is not sharp, the sharpness is relatively poor. A mode in which the inner blade 42 is rotated in the reverse direction and the ridge X is cut by the second cutting edge 42b of the small blade 42A is referred to as a “scratch reduction mode (second mode)”.

  In addition, you may provide separately the "scrap cleaning mode (3rd mode)" which reversely rotates the inner blade 42 and cleans soot.

  Furthermore, as a fourth mode, when the switch button 16 is operated to a predetermined position (a concept including an operation that is pressed a predetermined number of times), the control unit 50 rotates the inner blade 42 from the signal output unit 54. Control may be performed so that a signal whose direction is the forward rotation direction and a signal whose direction is the reverse rotation direction are alternately output to the switching circuit 52 at predetermined time intervals. According to this, it is possible to use a mode (“automatic switching mode”) in which the “normal mode” and the “scratch reduction mode” are automatically switched at predetermined time intervals and repeated. Therefore, it is possible to realize a usage method in which a wrinkle in a sleeping state is caused by the “relief mode” and a deep cut is made by the “normal mode”.

  In addition to the above-described effects, when used in the “normal mode”, the second cutting edge 42b on the rear end side in the rotational direction is brought into sliding contact with the lower surface 22b of the outer cutter 22 so as to be dragged. The second cutting edge 42b (tip portion) is sharpened. Therefore, when used in the “relief mode” after the “normal mode”, the sharpness of the wrinkles by the second cutting edge 42b can be further improved.

  Similarly, when used in the “scratch reduction mode”, the first cutting edge 42a on the rear end side in the rotational direction is brought into sliding contact with the lower surface 22b of the outer cutter 22 so as to be dragged. The blade edge 42a (tip portion) is sharpened. Therefore, when used in the “normal mode” after the “scratch reduction mode”, the effect of further improving the sharpness of the wrinkles by the first cutting edge 42a can be obtained.

  As described above, according to the rotary electric shaver according to the present invention, the inner blade 42 having a simple structure can be formed with fewer steps. Moreover, the structure which rotates the said inner blade 42 forward and backward is implement | achieved. Furthermore, in both cases where the inner blade 42 is rotated forward and when the inner blade 42 is rotated backward, it is possible to cut the wrinkle that has entered the forward entrance 22c of the outer blade 22 by the inner blade 42 (small blade 42A). Become. That is, when the inner blade 42 is rotated forward, the scissors can be cut by the first cutting edge 42a of the small blade 42A, and when the inner blade 42 is rotated in the reverse direction, the second blade 42A of the small blade 42A is cut. The cutting edge can be cut by the cutting edge 42b.

  Here, by setting the rake angle β1 of the first cutting edge 42a of the small blade 42A to a relatively small acute angle, the cutting mode of the ridges by the first cutting edge 42a is changed to a “normal mode with a relatively good sharpness” Can be set. On the other hand, by setting the rake angle β2 of the second cutting edge 42b of the small blade 42A to a relatively large acute angle, the cutting mode of the wrinkles by the second cutting edge 42b is relatively less damaged to the skin, It can be set as a “scratch mitigation mode” in which tingling is unlikely to occur. By switching the switch button 16, the user can arbitrarily select “normal mode” and “scratch reduction mode” and use them properly. Therefore, since the mode can be freely selected by one unit, it is possible to cope with both a mode that prioritizes sharpness and a mode that prioritizes reduction of tingling, and convenience is improved.

  Further, when used in the “normal mode”, the second cutting edge 42b on the rear end side in the rotational direction is sharply sharpened, so that after the “normal mode”, the “scratch reduction mode” is performed. By using it, it becomes possible to improve the sharpness of the wrinkles by the second cutting edge 42b. On the other hand, when used in the “scratch reduction mode”, the first cutting edge 42a on the rear end side in the rotational direction is sharpened, so that the “normal mode” is provided after the “scratch reduction mode”. By using it, it becomes possible to improve the sharpness of the ridge by the first cutting edge 42a.

  As described above, the rotary type includes the inner blade 42 that has a simple configuration and can be rotated in the forward rotation direction and the reverse rotation direction, and has the normal mode and the chill reduction mode that can be switched by switching the rotation direction of the inner blade 42. An electric razor 1 can be realized.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the present invention. In particular, a rotary electric shaver having three combinations of outer blades and inner blades (blade units) has been described as an example, but the present invention is not limited to this.

DESCRIPTION OF SYMBOLS 1 Rotary type electric shaver 2 Main-body part 3 Head part 6 Blade unit 10 Case 16 Switch button 22 Outer blade 22a The upper surface (shaving surface) of an outer blade
22b Lower surface 22c of outer blade Slit (advancing entrance)
24 Outer blade ring 26 Stopper ring 30 Blade frame 32 Head case 42 Inner blade 42A Small blade 42B Metal plate plate surface 42a First blade edge 42b Second blade edge 42c Upper edge surface 42d of small blade First end surface 42e of small blade Blade second end face 42f Recess 44 Inner blade holder 46 Inner blade receiver 50 Control unit 52 Switching circuit 54 Signal output unit 60 Motor X

Claims (5)

A rotary electric razor comprising a blade unit having an outer blade in which a plurality of reciprocating entrances are formed and an inner blade that rotates while sliding on the lower surface of the outer blade,
The inner blade has a plurality of small blades, and is provided so as to be rotatable in the forward rotation direction and the reverse rotation direction,
The blade is
By forming a part of the metal plate so that the angle α on the front side in the positive rotation direction with respect to the plate surface of the metal plate is an acute angle, on the tip side in the positive rotation direction,
A first cutting edge capable of cutting the scissors entering the scissors entrance is formed, and
On the tip side surface in the reverse rotation direction , a recess having a shape that is bent from the upper end surface toward the lower end is provided, so that the wrinkle that has entered the advance entrance can be cut on the tip side in the reverse rotation direction. A second cutting edge is formed,
The apparatus further comprises switching means for switching between a first mode for cutting the scissors with the first cutting edge and a second mode for cutting the scissors with the second cutting edge by switching the rotation direction of the inner blade. A rotary electric razor characterized by that. A control unit that controls a motor that rotationally drives the inner blade;
The switching means is configured to include a switch button provided in the main body and the control unit,
The signal according to the switching operation of the switch button is sent to a switching circuit provided in the control unit, and the switching circuit switches the rotation direction of the inner blade by switching the polarity of the motor. The rotary electric razor according to 1. The small blade is formed such that the rake angle β1 of the first blade edge is formed at a relatively small angle, and the rake angle β2 of the second blade edge is formed at a relatively large angle. The rotary electric shaver according to claim 1 or 2, characterized by the above. The small blade has a rake angle β1 of the first cutting edge of 40 ° ≦ β1 ≦ 60 °, and a rake angle β2 of the second cutting edge of 75 ° ≦ β2 ≦ 85 °. The rotary electric shaver according to claim 3 , wherein the rotary electric shaver is provided. When the switch button is operated to a predetermined position, the control unit is configured such that a signal output unit provided in the control unit has a signal that the rotation direction of the inner blade is the forward rotation direction and a signal that is the reverse rotation direction. Are output to the switching circuit alternately at predetermined time intervals. The rotary electric shaver according to any one of claims 2 to 4 .

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