CN114746231A

CN114746231A - Electric hair cutting device

Info

Publication number: CN114746231A
Application number: CN202080084035.1A
Authority: CN
Inventors: 王嵬; 小川仁志; 習田祐作
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2019-12-06
Filing date: 2020-09-11
Publication date: 2022-07-12
Also published as: JP7316568B2; JP2021090486A; WO2021111697A1

Abstract

The conversion section of the electric hair cutter according to the present invention includes an eccentric rotation section having an eccentric shaft disposed at a position eccentric with respect to the output shaft and rotatably coupled to the output shaft. The conversion section includes an input conversion section. The input conversion unit includes: a rotational center portion having a central axis; and a1 st arm portion connected to the rotation center portion so as to be capable of reciprocating rotational motion about the central axis, and connected to the eccentric shaft. The input conversion portion further includes a2 nd arm portion, the 2 nd arm portion reciprocating rotational movement about the central axis in conjunction with the movement of the 1 st arm portion, and being linked to the connecting portion.

Description

Electric hair cutting device

Technical Field

The present invention relates to an electric hair cutting device.

Background

Conventionally, as disclosed in patent document 1 below, an electric hair cutting device has been proposed in which an angle formed between a moving direction of a movable blade provided on a head and a longitudinal direction of a handle portion supporting the head is acute or parallel.

With such an electric hair cutting device, the electric hair cutting device can be used without changing the grip portion over a wider range than when the moving direction of the movable blade is orthogonal to the longitudinal direction of the grip portion. As a result, the convenience of use of the electric hair cutting device can be further improved.

Further, the electric hair cutting device disclosed in patent document 1 includes a conversion unit that converts the rotational motion of the output shaft of the motor into the reciprocating linear motion of the movable blade.

Specifically, in patent document 1, the conversion unit is configured by a1 st conversion unit that converts the rotational motion of the output shaft into a reciprocating rotational motion about a1 st central axis, a2 nd conversion unit that converts the reciprocating rotational motion into a reciprocating linear motion, and an output unit that connects the 2 nd conversion unit and the movable blade. By providing this, the structure of the conversion section for converting the rotational motion of the output shaft of the motor into the reciprocating linear motion of the movable blade can be simplified.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-118023

Disclosure of Invention

In this way, the structure of the electric hair cutting device can be simplified in the conventional art, but it is preferable to further simplify the structure.

Therefore, an object of the present invention is to obtain an electric hair cutting device which can be further simplified in structure.

In the electric hair cutter according to the present invention, the angle formed by the moving direction of the movable blade with respect to the fixed blade provided on the head and the longitudinal direction of the handle portion supporting the head is acute, or the moving direction is parallel to the longitudinal direction. Further, the electric type hair cutting device includes: an electric motor; a conversion unit that converts a rotational motion of an output shaft of the motor into a reciprocating rotational motion about a central axis that intersects a direction parallel to the output shaft; and a connecting portion that is integrated with the movable blade, is connected to the converting portion, and is driven by the reciprocating rotational motion transmitted from the converting portion. Further, the conversion section includes: an eccentric rotating portion having an eccentric shaft disposed at a position eccentric to the output shaft so as to be rotatable about the output shaft, the eccentric rotating portion being rotatably coupled to the output shaft; and an input conversion unit coupled to the eccentric shaft so as to be capable of converting a rotational motion of the eccentric shaft into the reciprocating rotational motion. Further, the input conversion unit includes: a rotational center portion having the central axis; a1 st arm portion connected to the rotation center portion so as to be capable of reciprocating rotation about the center axis and connected to the eccentric shaft; and a2 nd arm portion that reciprocates around the central axis in conjunction with the movement of the 1 st arm portion, and is coupled to the connecting portion.

According to the present invention, an electric hair cutting device with a further simplified structure can be obtained.

Drawings

Fig. 1A is a diagram showing an electric hair cutting device according to an embodiment, which is a side view.

Fig. 1B is a front view showing an electric hair cutting device according to an embodiment.

Fig. 2 is a perspective view showing an electric hair cutting device according to an embodiment.

Fig. 3 is a perspective view partially exploded showing an electric hair cutting device according to an embodiment.

Fig. 4 is a view showing an inner surface of a blade unit according to an embodiment.

Fig. 5 is a view illustrating a relationship between a grip portion and a blade cutting surface of the electric-powered hair cutting device according to the embodiment, as viewed from a direction perpendicular to a longitudinal direction of the grip portion and along the blade cutting surface.

Fig. 6 is a diagram showing an internal structure of an electric hair cutting device according to an embodiment.

Fig. 7 is a sectional view a-a of fig. 1B.

Fig. 8 is an enlarged view of the head portion of fig. 7.

Fig. 9A is a diagram illustrating the operation of the switching section included in the electric hair cutting device according to the embodiment, and is a diagram illustrating a state in which the movable blade is positioned at the uppermost end of the movement range.

Fig. 9B is a diagram for explaining the operation of the switching section included in the electric hair cutting device according to the embodiment, and is a cross-sectional view B-B of fig. 9A.

Fig. 9C is a diagram illustrating the operation of the switching unit included in the electric hair cutting device according to the embodiment, and is a diagram showing a state in which the movable blade is positioned at the center of the movement range.

Fig. 9D is a diagram for explaining the operation of the switching section included in the electric hair cutting device according to the embodiment, and is a cross-sectional view taken along line C-C of fig. 9C.

Fig. 9E is a diagram for explaining the operation of the switching section included in the electric hair cutting device according to the embodiment, and is a diagram showing a state in which the movable blade is positioned at the lowermost end of the movement range.

Fig. 9F is a diagram illustrating the operation of the switching section included in the electric-powered hair cutting device according to the embodiment, and is a cross-sectional view taken along line D-D of fig. 9E.

Fig. 10 is a perspective view showing an input switching unit included in a switching unit of an electric hair cutting device according to an embodiment.

Fig. 11A is a diagram showing an input switching section included in a switching section of an electric-type hair cutting device according to an embodiment, as viewed in a direction extending along a central axis.

Fig. 11B is a view showing an input switching unit included in the switching unit of the electric-type hair cutting device according to the embodiment, as viewed along the direction in which the 1 st arm portion extends.

Fig. 11C is a view showing an input converting section included in the converting section of the electric-type hair cutting device according to the embodiment, as viewed from a direction orthogonal to a direction in which the center axis extends and a direction in which the 1 st arm section extends.

Fig. 12A is a view showing a roller according to a modification, and is a perspective view seen from one direction.

Fig. 12B is a view showing a roller according to a modification, and is a perspective view seen from another direction.

Fig. 13A is a view showing a roller according to a modification, and is a view seen from one direction orthogonal to the extending direction of the through-holes.

Fig. 13B is a view showing a roller according to a modification, which is viewed from another direction orthogonal to the extending direction of the through-holes.

Fig. 13C is a view showing a roller according to a modification, as viewed from the extending direction of the through-holes.

Fig. 14A is a cross-sectional view of a roller according to a modification, and is a cross-sectional view E-E of fig. 13A.

Fig. 14B is a cross-sectional view of a roller according to a modification, and is a cross-sectional view F-F of fig. 13A.

Fig. 15A is a diagram illustrating an operation of a switching portion including a roller according to a modification, and is a diagram illustrating a state in which a movable blade is positioned at the uppermost end of a movement range.

Fig. 15B is a diagram for explaining an operation of a switching section including a roller according to a modification, and is a sectional view G-G of fig. 15A.

Fig. 15C is a diagram illustrating an operation of a switching portion including a roller according to a modification, and is a diagram showing a state in which the movable blade is positioned at the center of the movement range.

Fig. 15D is a diagram for explaining an operation of a switching section including a roller according to a modification, and is a sectional view H-H of fig. 15C.

Fig. 15E is a diagram for explaining the operation of the switching section including the roller according to a modification, and is a diagram showing a state in which the movable blade is positioned at the lowermost end of the movement range.

Fig. 15F is a diagram for explaining an operation of a switching section including a roller according to a modification, and is a cross-sectional view I-I of fig. 15E.

Fig. 16 is a cross-sectional view showing a state in which a roller of a modification is held by a holding arm of an input switching section.

Fig. 17 is a perspective view showing an example of a state in which an attachment is attached to the electric-powered hair cutting device according to the embodiment and the modification.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment.

Here, in the present embodiment, each direction of the electric hair cutting device is defined as follows.

(A) The longitudinal direction of the handle of the electric hair cutter is defined as a longitudinal axis direction ZA, and a direction perpendicular to the longitudinal axis direction ZA in a front view of the electric hair cutter is defined as a width direction ZB.

(B) A direction orthogonal to the longitudinal axis direction ZA and the width direction ZB is referred to as a front-rear direction ZC.

(C) The direction from the handle portion side to the head portion side is defined as an upper direction ZA1 of the longitudinal axis direction ZA.

(D) The direction from the head side toward the handle side is defined as a direction ZA2 below the longitudinal axis ZA.

(E) A direction from the back surface side to the front surface side of the handle portion is defined as a front ZC1 of the front-rear direction ZC.

(F) A direction from the front side to the back side of the handle portion is defined as a rear ZC2 of the front-rear direction ZC.

(G) The linear reciprocating direction of the movable blade (the moving direction of the movable blade) is referred to as a blade moving direction W.

(H) The direction toward the upper ZA1 side in the longitudinal direction ZA in the blade moving direction W is referred to as a pressing direction WA, and the direction toward the lower ZA2 side in the longitudinal direction ZA in the blade moving direction W is referred to as a pulling direction WB.

(I) A direction perpendicular to the blade moving direction W substantially along the front-rear direction ZC is a depth direction WC.

(J) The direction from the back surface side to the front surface side of the head is referred to as a front WC1 of the depth direction WC.

(K) A direction from the front side to the back side of the head is set as a rear WC2 of the depth direction WC.

As shown in fig. 1 and 2, the electric-type hair cutting device 1 of the present embodiment includes a head portion 20 provided with a blade portion 23, and a handle portion 30 supporting the head portion 20. The electric hair cutting device 1 can be used as a body trimmer for treating or trimming body hair (hair) of a user or the like, for example.

The electric hair cutting device 1 includes a main body 10 made of synthetic resin, and the main body 10 is formed by joining a plurality of divided bodies. In the present embodiment, the main body 10 includes a housing 11 and a cover 12 as separate bodies.

A cavity is formed in the main body 10 formed by joining the divided bodies, and various electric components are housed in the cavity. The plurality of divided bodies can be joined to each other by using screws or fitting the divided bodies to each other, for example. In the present embodiment, the cover 12 is fixed to the housing 11 by using screws 92 as fixing members (see fig. 3).

As described above, in the present embodiment, the electric-powered hair cutting device 1 includes the head 20 and the grip 30.

The handle portion 30 is formed in a cylindrical shape elongated in the longitudinal axis direction ZA to a degree that can be gripped by a single hand of a user.

The head 20 is integrally connected to the grip 30 so as to protrude further forward ZC1 than the grip 30 in the front-rear direction ZC than the grip 30 and is provided above ZA1 in the longitudinal axis direction ZA of the grip 30.

The head 20 is provided with a blade portion 23, and the blade portion 23 includes a fixed blade 24a and a movable blade 25a that slides back and forth with respect to the fixed blade 24 a. The movable blade 25a is configured to reciprocate in the blade moving direction W with respect to the fixed blade 24 a.

Further, a peripheral surface 20a is formed around the blade portion 23 (the fixed blade 24a and the movable blade 25a) of the head portion 20. In the present embodiment, the peripheral surface 20a includes a pair of side surfaces 20B formed on both sides in the width direction ZB, an outer surface 22a of the blade unit 22, an upper surface 20c formed on the pressing direction WA side, and a lower surface 20d formed on the pulling direction WB side (see fig. 1A and 1B).

Here, in the present embodiment, the blade unit 22 having the blade portion 23 formed thereon is detachably attached to the support unit 21 formed on the head portion 20, and thereby the blade portion 23 (the fixed blade 24a and the movable blade 25a) is provided on the head portion 20.

Specifically, the support unit 21 is formed in the head portion 20 by cutting out the side wall on one side in the width direction ZB of the head portion 20 so as to open to the front WC1 in the depth direction WC (see fig. 3).

The blade unit 22 has a function of cutting hair, and includes, as shown in fig. 4, a fixed plate 24 formed with a plurality of fixed blades 24a and a movable plate 25 formed with a plurality of movable blades 25 a. Further, the blade unit 22 includes a support frame 26 supporting the fixed plate 24 and a holding plate 27 supporting the movable plate 25. The blade unit 22 further includes a spring 28, and the spring 28 is attached to the support frame 26 and presses the fixed blade 24a against the movable blade 25a by pressing the movable plate 25 against the fixed plate 24.

Here, the fixed plate 24 and the movable plate 25 are disposed so as to face each other in the width direction ZB in a state where the blade unit 22 is attached to the support unit 21. The support frame 26 supports the stationary plate 24 from the side opposite to the side on which the movable plate 25 is disposed with respect to the stationary plate 24. This arrangement suppresses the displacement of the fixing plate 24. The holding plate 27 supports the movable plate 25 from the side opposite to the side where the fixed plate 24 is disposed with respect to the movable plate 25. This arrangement suppresses the displacement of the movable plate 25.

As the spring 28 for bringing the fixed blade 24a and the movable blade 25a into contact with each other, for example, a torsion spring can be used, and in the present embodiment, the spring 28 is attached to the support frame 26.

The blade unit 22 is detachably attached to the support unit 21. The blade unit 22 is attached to the support unit 21 in a state in which the cutting edge of the fixed blade 24a and the cutting edge of the movable blade 25a are oriented in a direction intersecting the longitudinal direction of the handle 30.

Specifically, the blade unit 22 is attached to the support unit 21 in a state in which the cutting edge of the fixed blade 24a and the cutting edge of the movable blade 25a face forward WC1 in the depth direction WC which is a direction intersecting the longitudinal axis direction ZA.

In the present embodiment, the blade unit 22 is attached to the support unit 21 in a state of being held by the spring (holding portion) 91.

At this time, the outer surface 22a of the blade unit 22 is substantially flush with the side surface 20b (peripheral surface 20a) of the head 20. In addition, in a state where the blade unit 22 is attached to the support unit 21, the outer surface 22a of the blade unit 22 also functions as the peripheral surface 20a of the head portion 20.

In the present embodiment, in a state where the blade unit 22 is attached to the support unit 21, the distal end 21a of the support unit 21 protrudes further forward WC1 in the depth direction WC than the cutting edge of the fixed blade 24a and the cutting edge of the movable blade 25a (see fig. 1 and 2).

Further, the holding plate 27 is provided with a connecting portion 271, and a connecting portion 6221 (converting portion 60) described later is connected to the connecting portion 271 in a state where the blade unit 22 is attached to the supporting unit 21. With this arrangement, when the motor 50 described later is driven, a force in the width direction (the blade moving direction W) of the blade unit 22 is transmitted from the switching portion 60 to the connecting portion 271.

Here, in the present embodiment, the holding plate 27 including the connecting portion 271 is integrated with the movable blade 25a (movable plate 25). Therefore, when a force is transmitted from the switching portion 60 to the connecting portion 271, the holding plate 27 reciprocates in the width direction of the blade unit 22 (the blade moving direction W), and the movable plate 25 reciprocates in the width direction of the blade unit 22 in conjunction with the reciprocation of the holding plate 27.

As described above, in the present embodiment, the coupling portion 271 and the movable blade 25a are integrated, so that the coupling portion 271 and the movable blade 25a can be integrally moved (moved without a relative change in the positional relationship therebetween).

In the present embodiment, the guide groove 26a is formed in the support frame 26 so as to extend in the width direction of the blade unit 22 (see fig. 4). A guide projection, not shown, formed on the holding plate 27 is slidably inserted into the guide groove 26 a. By providing such a configuration, the holding plate 27 that supports the movable plate 25 can linearly move relatively in the width direction (blade moving direction W) of the blade unit 22 with respect to the supporting frame 26 that supports the fixed plate 24.

Thus, in a state where the blade unit 22 is attached to the support unit 21, the plurality of movable blades 25a can reciprocate linearly in the blade moving direction W with respect to the plurality of fixed blades 24 a.

Further, in the present embodiment, the movable blade 25a is linearly reciprocated in the width direction (blade moving direction W) of the blade unit 22 within the range of the moving range R1 shown in fig. 4. In a state where the blade unit 22 is attached to the support unit 21, the reference symbol R1a shown in fig. 4 is the uppermost end of the movement range R1 of the movable blade 25a, and the reference symbol R1b shown in fig. 4 is the lowermost end of the movement range R1 of the movable blade 25 a.

In the present embodiment, the electric hair cutting device 1 is configured such that the angle θ 1 formed by the movable blade 25a with respect to the moving direction of the fixed blade 24a (the blade moving direction W) and the longitudinal direction of the handle 30 (the longitudinal axis direction ZA) is an acute angle. The angle θ 1 is determined based on operability when cutting hair using the electric-type hair cutting device 1, and is preferably set to 45 ° or less. In the present embodiment, a case where the angle θ 1 is set to 10 ° is exemplified. In the electric hair cutting device 1, the moving direction of the movable blade 25a with respect to the fixed blade 24a may be parallel to the longitudinal direction of the handle 30.

In the present embodiment, in the electric hair cutting device 1, an angle θ 2 formed by a blade cutting plane P1, which is a plane in which the fixed blade 24a and the movable blade 25a slide, and the longitudinal direction (longitudinal axis direction ZA) of the handle 30 is an acute angle.

Specifically, when the electric hair cutting device 1 is viewed from a direction perpendicular to the longitudinal direction of the handle portion 30 and along the blade cutting plane P1, the projected shape of the blade cutting plane P1 is linear as shown in fig. 5. An angle θ 2 formed by a projection line of the blade cut surface P1 and the longitudinal direction of the grip portion 30 is an acute angle. The angle θ 2 is preferably 10 ° or less, and in the present embodiment, the angle θ 2 is exemplified as 3 °.

In this way, the difference between the operational feeling when the electric hair cutting device 1 is moved in one of the width directions ZB as the main operational direction and the operational feeling when it is moved in the other of the width directions ZB can be reduced. As a result, the electric hair cutter 1 can be used without giving a sense of discomfort in both the one side and the other side in the width direction ZB, and the convenience of use of the electric hair cutter can be further improved.

In the present embodiment, the motor 50, the converter 60, the power supply 70, and the like are housed in a cavity formed in the main body 10 (see fig. 6 and 7).

Specifically, the power supply unit 70 and the motor 50 are housed in a cavity formed on the handle unit 30 side, and the converter 60 is housed in a cavity formed on the head unit 20 side.

In the present embodiment, the motor 50 includes a main body 51 electrically connected to the power supply unit 70, and an output shaft 52 protruding from the main body 51 toward the upper side ZA1 in the longitudinal axis direction ZA. The motor 50 is driven by electric power supplied from a power supply unit 70.

The power supply unit 70 supplies electric power to the motor 50, and in the present embodiment, a rechargeable secondary battery is used as the power supply unit 70. The power supply unit 70 as a secondary battery is electrically connected to the connector unit 32 for charging formed below ZA2 in the longitudinal axis direction ZA of the handle unit 30. As the power supply unit 70, a primary battery may be used, or a power supply line connectable to an external power supply device may be used.

Here, in the present embodiment, the structure of the conversion unit 60 that converts the rotational motion of the output shaft 52 of the motor 50 into the reciprocating linear motion of the movable blade 25a can be further simplified.

Specifically, the conversion unit 60 functions as a mechanism for converting the rotational motion of the output shaft 52 into a reciprocating rotational motion about a center axis CL1 that intersects a direction parallel to the output shaft 52 (longitudinal axis direction ZA) (see fig. 8). The reciprocating rotational motion converted by the conversion unit 60 is directly transmitted to the connection unit 271 integrated with the movable blade 25a, and the movable blade 25a is linearly reciprocated by the reciprocating rotational motion directly transmitted to the connection unit 271.

The conversion unit 60 of the present embodiment includes an eccentric rotation unit 610 attached to the output shaft 52, and an input conversion unit 620 coupled to the eccentric rotation unit 610 and converting an eccentric motion of the eccentric rotation unit 610 into a reciprocating rotational motion.

The eccentric rotating portion 610 includes a rotating body 611 rotatably attached to the output shaft 52. The rotating body 611 is integrally attached to the output shaft 52 and rotates in conjunction with the rotation of the output shaft 52. In the present embodiment, output shaft 52 is press-fitted into press-fitting hole 611a formed in rotating body 611, thereby rotating body 611 together with output shaft 52.

The eccentric rotation portion 610 includes an eccentric shaft 612 provided at a position (position eccentric with respect to the output shaft 52) where the rotation center of the self-rotating body 611 is deviated. In the present embodiment, the eccentric shaft 612 is integrally coupled to the rotating body 611 in a state of protruding in a direction parallel to the output shaft 52 (longitudinal direction ZA). By this arrangement, the eccentric shaft 612 rotates around the output shaft 52 as the rotating body 611 rotates. In the present embodiment, eccentric shaft 612 is press-fitted into press-fitting hole 611b formed in rotating body 611, thereby integrating eccentric shaft 612 and rotating body 611.

Further, the eccentric rotation portion 610 includes a roller 613 held by an eccentric shaft 612. The roller 613 is provided with a through hole 613a that penetrates in the protruding direction of the eccentric shaft 612 (longitudinal axis direction ZA), and the roller 613 is held by the eccentric shaft 612 by inserting the eccentric shaft 612 through the through hole 613 a.

In the present embodiment, the roller 613 is attached to the eccentric shaft 612 in a state of being relatively movable in the axial direction of the eccentric shaft 612. The roller 613 is held by the eccentric shaft 612 in a state of being rotatable relative to the eccentric shaft 612.

On the other hand, the input conversion unit 620 is coupled to the eccentric shaft 612 via the roller 613 so as to be able to convert the rotational motion of the eccentric shaft 612 into reciprocating rotational motion. The input conversion portion 620 includes a substantially cylindrical rotation center portion 623 having a center axis CL1, and a substantially cylindrical rotation support shaft 624 inserted in a through hole 6231 formed in the rotation center portion 623.

In the present embodiment, in a state where the rotary support shaft 614 is press-fitted into the through hole 6231 of the rotation center portion 623, one end (one side in the width direction ZB) of the rotary support shaft 614 is inserted into a substantially cylindrical rib 11a formed in the housing 11 and is rotatably supported by the housing 11 (see fig. 3). The other end (the other side in the width direction ZB) of the rotation support shaft 614 is rotatably supported by a rib or the like formed on the cover 12. By providing such a configuration, the rotation center portion 623 and the rotation support shaft 624 are disposed in the main body 10 so as to be rotatable about the center axis CL 1.

Further, the rotation center 623 may be configured to be rotatable about the center axis CL1 by being relatively rotated with respect to the rotation support shaft 624.

Further, the input conversion portion 620 includes a1 st arm portion 621, and the 1 st arm portion 621 is coupled to the rotation center portion 623 so as to be capable of reciprocating rotational movement about the center axis CL 1. In the present embodiment, the 1 st arm portion 621 is formed integrally with a side portion of the rotation center portion 623, and protrudes radially outward from the side portion of the rotation center portion 623. A holding arm 6211 is provided on the tip end side of the 1 st arm portion 621, and the holding arm 6211 holds the roller 613 held by the eccentric shaft 612.

In the present embodiment, the holding arm 6211 is formed in a shape in which the distal end of the 1 st arm portion 621 is branched to both sides in the front-rear direction ZC. That is, the holding arm 6211 includes a1 st holding arm 6212 provided on the front ZC1 side of the front-rear direction ZC and a2 nd holding arm 6213 provided on the rear ZC2 side of the front-rear direction ZC.

In the present embodiment, the 1 st holding arm 6212 is formed in a shape in which a plate-like member elongated in the width direction ZB is convexly curved toward the front ZC1 side in the front-rear direction ZC. On the other hand, the 2 nd holding arm 6213 is formed in a shape in which a plate-like member elongated in the width direction ZB is convexly curved toward the rear ZC2 side in the front-rear direction ZC, and is formed to face the 1 st holding arm 6212 in the front-rear direction ZC.

By this arrangement, a substantially cylindrical concave portion 6214 extending in the width direction ZB is formed between the 1 st and 2

nd holding arms

6212 and 6213 facing each other. The roller 613 held by the eccentric shaft 612 is accommodated in the concave portion 6214, and the roller 613 is held by the holding arm 6211. In the present embodiment, the roller 613 is held by the holding arm 6211 in a state where the outer surface 613b of the roller 613 is brought into sliding contact with the inner surface 6215 of the holding arm 6211. That is, in the present embodiment, the holding arm 6211 is formed so that the inner surface 6215 has a shape corresponding to the outer surface 613b of the roller 613.

Further, the input conversion portion 620 includes a2 nd arm portion 622 that reciprocates rotationally about the center axis CL1 in conjunction with the movement of the 1 st arm portion 621. In the present embodiment, the 2 nd arm portion 622 is also formed integrally with the side portion of the rotation center portion 623, and protrudes radially outward from the side portion of the rotation center portion 623. A connection portion 6221 connected to the connection portion 271 of the holding plate 27 is provided at the tip end side of the 2 nd arm portion 622.

In the present embodiment, the coupling portion 6221 is formed in a substantially cylindrical shape elongated in the width direction ZB, and the coupling portion 6221 is accommodated in a slit-shaped connecting portion 271 that opens to a rear WC2 in the depth direction WC (a direction orthogonal to the blade moving direction W). At this time, the coupling portion 6221 is coupled to the coupling portion 271 in a state where the outer surface 6221a is in sliding contact with the inner surface 271a of the coupling portion 271. The connecting portion 271 is a member integrated with the movable blade 25a, is connected to the switching portion 60, and is driven by the reciprocating rotational motion transmitted from the switching portion 60.

As described above, in the present embodiment, the 1 st arm portion 621 is integrally formed with the side portion of the rotation center portion 623, and the 2 nd arm portion 622 is integrally formed with the side portion of the rotation center portion 623. That is, in the present embodiment, the 1 st arm portion 621, the 2 nd arm portion 622, and the rotation center portion 623 are integrally (formed by one member). The 1 st arm 621, the 2 nd arm 622, and the rotation center 623 can be formed using, for example, resin.

When the 1 st arm 621, the 2 nd arm 622, and the rotation center portion 623 are integrally formed in this manner, the 2 nd arm 622 reciprocates about the center axis CL1 in conjunction with the reciprocating rotation of the 1 st arm 621 about the center axis CL 1. That is, the 1 st arm 621 and the 2 nd arm 622 move integrally (move without a relative change in the positional relationship therebetween).

Further, at least one of the 1 st arm 621, the 2 nd arm 622, and the rotation center portion 623 may be formed of an independent member, and the 1 st arm 621 and the 2 nd arm 622 may be integrally movable by integrating the members.

In the present embodiment, the 1 st arm 621 extends linearly from the side portion of the rotation center portion 623 to the outside in the radial direction. The 2 nd arm portion 622 extends linearly in a direction radially outward from the side portion of the rotation center portion 623 and in a direction different from the direction in which the 1 st arm portion 621 extends.

As described above, in the present embodiment, the input conversion portion 620 is formed in a substantially L-letter shape when viewed along the center axis CL 1. Further, one end (the tip of the 1 st arm 621) of the substantially L-letter shaped input conversion portion 620 is coupled to the eccentric rotation portion 610, and the other end (the tip of the 2 nd arm 622) is coupled to the connection portion 271. With this arrangement, the rotary motion of the output shaft 52 of the motor 50 is converted into a reciprocating rotary motion about the center axis CL1, and the converted reciprocating rotary motion is transmitted to the connecting portion 271, so that the movable blade 25a is reciprocated and linearly moved.

By providing the input conversion unit 620 as a single component in this manner, the configuration of the input conversion unit 620 can be simplified. Further, by forming the input conversion unit 620 in a substantially L-letter shape, the input conversion unit 620 itself can be made compact, and the space for disposing the input conversion unit 620 in the main body 10 can be further reduced. As a result, the size of the main body 10 can be reduced.

In the present embodiment, the input conversion unit 620 having such a shape is disposed in the main body 10 in a state where the central axis CL1 passes through the output axis L1 of the motor 50 (see fig. 8).

That is, the rotation center portion 623 is disposed on the output axis L1 of the motor 50. In other words, the input conversion unit 620 is disposed in the main body 10 such that the output axis L1 of the motor 50 passes through the rotation center 623.

In this way, the 1 st arm 621 can be rotated uniformly about the output axis L1 of the motor 50. That is, the rotation angle from the output axis L1 of the motor 50 in the front-rear direction ZC can be set to substantially the same angle.

When the input conversion unit 620 is disposed in the main body 10, the center line of the 1 st arm 621 is preferably substantially aligned with the output axis L1 of the motor 50 in a state where the output shaft 52 and the eccentric shaft 612 are aligned on a straight line when viewed along the center axis CL 1.

In this way, the roller 613 can be slid uniformly about the center line of the 1 st arm 621, and the input converting portion 620 can be prevented from rattling, thereby making the electric-type hair cutting device 1 silent. Further, the input conversion unit 620 can be downsized in the extending direction (width direction ZB) of the center axis CL 1.

In the present embodiment, the input conversion unit 620 is disposed in the main body 10 in a state where the center axis CL1 passes through the intersection CP1, and the intersection CP1 is an intersection between the output axis L1 of the motor 50 and a center plane P1 passing through the center of the movement range R1 of the movable blade 25a and orthogonal to the movement direction W of the movable blade 25 a.

Here, the center plane P1 is a plane passing through the midpoint between the upper end R1a and the lower end R1b of the movement range R1 and orthogonal to the movement direction W of the movable blade 25a, and is a plane along the depth direction WC.

By disposing the rotation center portion 623 at the intersection CP1 in this manner, the extending direction of the 2 nd arm portion 622 can be substantially aligned with the direction (depth direction WC) orthogonal to the moving direction W of the movable blade 25 a. The 2 nd arm 622 can be positioned at the center of the moving range R1 of the movable blade 25 a.

In this way, the reciprocating rotational movement of the 2 nd arm portion 622 about the center axis CL1 can be uniformly rotated in the moving direction W of the movable blade 25a about the projection line of the center plane P1. As a result, the movable blade 25a can be slid uniformly in both sides in the blade moving direction W.

When the 2 nd arm portion 622 reciprocates and rotates about the center axis CL1, a straight line connecting both ends of an arc described by the connecting portion 6221 at the tip end of the 2 nd arm portion 622 is substantially parallel to the blade moving direction W. Therefore, the amount of movement of the movable blade 25a in the blade movement direction W (the amount of movement of the movable blade 25a) when rotated by the same angle can be maximized.

By disposing the rotation center portion 623 at the intersection CP1 in this way, the amount of movement of the movable blade can be maximized while minimizing the disposition space of the input conversion portion 620, and the electric hair cutting device 1 can be made compact without reducing the hair cutting performance of the blade portion 23.

In the present embodiment, as described above, the electric hair cutting device 1 is configured such that the angle θ 1 formed between the blade moving direction W and the longitudinal direction (longitudinal axis direction ZA) of the handle portion 30 is an acute angle. The example shows a case where the angle θ 1 is set to 10 °.

That is, in the present embodiment, the electric hair cutting device 1 is exemplified in which the blade section 23 is disposed so that the lower end side protrudes to the front ZC1 in the front-rear direction ZC more than the upper end side, and by adopting such a configuration, the usability of the electric hair cutting device 1 can be further improved.

Here, in the present embodiment, the shape of the input conversion section 620 is more suitable for the shape of the electric-type hair cutting device 1 shown in the present embodiment.

Specifically, the shape of the input conversion unit 620 is set so that the angle θ 3 formed between the 1 st arm 621 and the 2 nd arm 622 is an obtuse angle. Specifically, the angle θ 3 is an angle formed by the center line of the 1 st arm 621 and the center line of the 2 nd arm 622 (see fig. 8). The angle θ 3 is preferably 90 ° or more and less than 180 °. In the present embodiment, the angle θ 3 is set to about 100 ° to 110 °.

When the angle θ 3 formed by the 1 st arm 621 and the 2 nd arm 622 is made obtuse as described above, the input switching unit 620 suitable for the electric-powered hair cutting device 1 with better usability can be provided, and the electric-powered hair cutting device 1 can be miniaturized.

For example, when the angle θ 3 is set to 180 °, the shape of the electric hair cutting device suitable for the shape of the input conversion section 620 is a so-called T-letter electric hair cutting device in which the blade section extends in the horizontal direction with respect to the grip section extending in the vertical direction.

Such an electric hair cutter has a high frequency of hand change during use, and therefore is not so convenient to use.

Therefore, when the angle θ 3 is set to 180 °, the shape of the input converting portion 620 is not so suitable for the electric hair cutting device which is convenient to use, and therefore, the electric hair cutting device cannot be downsized.

When the angle θ 3 is set to be smaller than 90 degrees, the shape of the electric hair cutter suitable for the shape of the input converting portion 620 is an electric hair cutter in which the blade portions are disposed so that the upper end side protrudes from the lower end side toward the front ZC1 in the front-rear direction ZC.

In such an electric hair cutting device, the blade portion is oriented obliquely downward with respect to the grip portion extending in the vertical direction.

When an electric hair cutting device having such a shape is used, it is difficult to bring the blade portion into close contact with the skin, and therefore, the electric hair cutting device in which the blade portion is oriented obliquely downward is not easy to use.

Further, when the electric hair cutting device is downsized, the length of the grip portion is also shortened, and therefore, when the grip portion is held, the fingers of the hand are positioned near the lower end of the blade portion. In this case, if the amount of protrusion of the lower end side of the blade portion is small, a space for disposing fingers cannot be secured between the grip portion and the blade portion, and the electric hair cutting device is less convenient to use.

Further, if the amount of projection of the lower end of the blade portion is increased in order to secure a space for disposing fingers between the handle portion and the blade portion, the amount of projection of the upper end of the blade portion becomes larger.

Therefore, if the space for disposing the fingers is secured while the vertical size is reduced, the size becomes large in the front-rear direction.

If the angle θ 3 is set to 180 ° or less than 90 ° in this way, the shape of the input converting portion 620 cannot be made suitable for an electric hair cutting device that can be miniaturized while suppressing deterioration in usability. That is, the shape of the input converting section 620 cannot satisfy both the miniaturization and the convenience of use of the electric hair cutting device.

On the other hand, if the angle θ 3 is set to 90 ° or more and less than 180 °, that is, if the angle θ 3 is set to an obtuse angle, the shape of the input converting portion 620 can be set to a shape suitable for an electric hair cutting device in which the blade portion is oriented obliquely downward with respect to the grip portion extending in the vertical direction.

As described above, such an electric hair cutting device is a device that is convenient to use. Further, even when the electric hair cutting device is downsized, since the amount of projection of the blade portion on the lower end side is equal to or more than the amount of projection of the blade portion on the upper end side, a space for disposing fingers can be secured between the grip portion and the blade portion while suppressing an increase in size in the front-rear direction.

When the angle θ 3 is an obtuse angle in this way, the shape of the input converting section 620 is more suitable for an electric hair cutting device that can achieve both miniaturization and ease of use.

In the present embodiment, the sealing portion 80 is provided in the main body portion 10, and thus, water can be prevented from entering the space in which the motor 50 is disposed.

In the present embodiment, the sealing portion 80 includes a waterproof member 81 formed of a member having elasticity such as rubber, and a waterproof member support portion 82 made of metal or resin for supporting the waterproof member 81.

The waterproof member 81 and the waterproof member support portion 82 are respectively formed with a through hole 81a and a through hole 82a, and the output shaft 52 of the motor 50 is inserted through the through hole 81a and the through hole 82 a.

As shown in fig. 3, first, the output shaft 52 of the electric motor 50 is inserted through the through hole 82a of the waterproof member support portion 82, and the waterproof member support portion 82 is disposed on the main body portion 51. Next, the output shaft 52 of the motor 50 is inserted through the through hole 81a of the waterproof member 81, and the waterproof member 81 is supported by the waterproof member support portion 82. Further, a waterproof rib 81b is formed on the peripheral edge of the through hole 81a in the waterproof member 81, and when the waterproof rib 81b is disposed in the main body 10, the waterproof rib 81b is sandwiched between the case 11 and the waterproof member support portion 82. The diameter of the through hole 81a is slightly smaller than the diameter of the output shaft 52, and the peripheral edge of the through hole 81a is configured to elastically press the output shaft 52 over the entire circumference.

With this arrangement, the water can be prevented from entering the space in which the motor 50 is disposed.

The rotating body 611 is press-fitted into a portion of the output shaft 52 that protrudes upward from the waterproof portion 80.

In the present embodiment, the dust-proof member 83 is provided, and the dust-proof member 83 is used to prevent foreign matter such as hair from entering the main body 10 and winding around the eccentric shaft 612 and the roller 613.

In the present embodiment, a cushion pad is used as the dust-proof member 83. The dust-proof member 83 is attached to the 1 st arm portion 621 by inserting the 1 st arm portion 621 through the through hole 83a of the dust-proof member 83 and engaging the dust-proof member 83 with the notch 6216 formed in the middle of the 1 st arm portion 621. The dust-proof member 83 is held by the housing 11 by being accommodated in a dust-proof member holding portion 11b formed in the housing 11.

With this arrangement, it is possible to suppress entry of foreign matter such as relatively long hair into the eccentric shaft 612 side.

In the present embodiment, a slide-type operation switch 40 (for turning on and off the power supply) for operating the electric hair cutting device 1 is formed in the housing 11. In the present embodiment, the slide-type operation switch 40 is exemplified as the switch, but a push-type or other switch may be used as long as it can turn on and off the power supply.

In the present embodiment, the operation switch 40 is provided on the front surface (front surface: outer surface) 30a of the handle portion 30 so as to be slidable in the longitudinal axis direction ZA. Specifically, the operation switch 40 is slid from the lower ZA2 side toward the upper ZA1 side in the longitudinal axis direction ZA, thereby switching the power supply of the electric hair cutting device 1 from off to on. Further, the operation switch 40 is slid from the upper ZA1 side to the lower ZA2 side in the longitudinal axis direction ZA, thereby switching the power supply of the electric hair cutting device 1 from on to off.

In this way, in the present embodiment, the power supply of the electric-type hair cutting device 1 is switched from off to on by sliding the operation switch 40 upward. Then, the electric motor 50 is driven and the output shaft 52 is rotated by switching the power supply of the electric hair cutting device 1 from off to on.

When the output shaft 52 is rotated by turning on the power supply of the electric-type hair cutting device 1 in this manner, the rotating body 611 and the eccentric shaft 612 attached integrally with the output shaft 52 also rotate in conjunction with the output shaft 52.

Specifically, the eccentric shaft 612 performs a circular motion about the output shaft 52. That is, the eccentric shaft 612 rotates about the output shaft 52. At this time, the roller 613 held by the eccentric shaft 612 also rotates about the output shaft 52. That is, the roller 613 rotates, for example, from the position shown in fig. 9B to the position shown in fig. 9F via the position shown in fig. 9D. Further, the roller 613 may be rotated in the opposite direction.

When the roller 613 is also rotated about the output shaft 52 in this manner, the holding arm 6211 that holds the roller 613 also moves in accordance with the rotation of the roller 613. Specifically, when the roller 613 rotates about the output shaft 52, the roller 613 moves within the concave portion 6214 of the holding arm 6211 along the center axis CL1 while rotating with respect to the eccentric shaft 612 within the concave portion 6214 (rolling within the concave portion 6214). Then, by the movement of the roller 613, the holding arm 6211 is pressed, and the 1 st arm 621 reciprocates and rotates around the center axis CL 1. Further, the roller 613 rotates about the output shaft 52 while also reciprocating in the axial direction of the eccentric shaft 612.

Further, when the 1 st arm portion 621 reciprocates around the center axis CL1, the rotation center portion 623 formed integrally with the 1 st arm portion 621 and the rotation support shaft 624 integrated with the rotation center portion 623 reciprocate around the center axis CL1 in association. Further, the 2 nd arm portion 622 integrally formed with the 1 st arm portion 621 and the rotation center portion 623 also reciprocates about the center axis CL1 in conjunction with the reciprocating rotational movement of the 1 st arm portion 621 about the center axis CL 1.

Further, since the connection portion 6221 formed at the tip of the 2 nd arm portion 622 is connected to the connection portion 271, the reciprocating rotational motion of the 2 nd arm portion 622 about the center axis CL1 is transmitted to the connection portion 271 via the connection portion 6221.

Here, in the present embodiment, as described above, the holding plate 27 is configured to be linearly moved relative to the support frame 26 in the width direction (the blade moving direction W) of the blade unit 22 by the guide groove 26a and the guide projection.

Therefore, the connecting portion 271 (holding plate 27) is linearly reciprocated in the blade moving direction W by the force (component force) in the blade moving direction W applied from the coupling portion 6221 by the reciprocating rotational motion.

In this way, in the present embodiment, the reciprocating rotational motion of the 2 nd arm portion 622 about the center axis CL1 is directly transmitted to the connecting portion 271, so that the connecting portion 271 and the movable blade 25a integrated with the connecting portion 271 are reciprocated linearly in the blade moving direction W. In the present embodiment, when the roller 613 is at the position shown in fig. 9B, the movable blade 25a is positioned on the upper end side of the movement range R1 (see fig. 9A). When the roller 613 is at the position shown in fig. 9D, the movable blade 25a is positioned on the center side of the movement range R1 (see fig. 9C). When the roller 613 is at the position shown in fig. 9F, the movable blade 25a is positioned on the lower end side of the movement range R1 (see fig. 9E).

The coupling portion 6221 reciprocates and rotates in a reciprocating manner while reciprocating in the depth direction WC in the slit-shaped coupling portion 271.

In the present embodiment, as described above, the roller 613 moves along the center axis CL1 while rolling in the concave portion 6214 of the holding arm 6211.

That is, when the roller 613 rotates around the output shaft 52, the roller presses the holding arm 6211 while changing the position in the depth direction WC.

When the holding arm 6211 is pressed while changing the position in the depth direction WC in this manner, a moment in a direction rotating in the direction of the center axis CL1 may be generated in the 1 st arm 621. When a moment in the direction of rotation in the direction of the center axis CL1 is generated in the 1 st arm 621, the vibration of the input conversion unit 620 becomes large, and noise may be generated.

Further, a rotational moment about the depth direction WC may be generated in the 2 nd arm 622 due to the resistance of the blade unit 22. Further, the generation of the rotational moment about the depth direction WC may increase the vibration of the input converting portion 620, and may generate noise.

Therefore, in the present embodiment, it is assumed that the input conversion unit 620 can be suppressed from vibrating.

Specifically, the width of the rotation center portion 623 in the direction of the center axis CL1 is larger than the width of the 1 st arm portion 621 in the direction of the center axis CL 1. The width of the rotation center portion 623 in the direction of the center axis CL1 is larger than the width of the 2 nd arm portion 622 in the direction of the center axis CL 1.

In the present embodiment, on one end side in the direction of the center axis CL1, one end 623a in the direction of the center axis CL1 of the rotation center portion 623 is positioned closer to one end side in the direction of the center axis CL1 than the one end 621a in the direction of the center axis CL1 of the 1 st arm portion 621. On the other end side in the direction of the central axis CL1, the other end 623b in the direction of the central axis CL1 of the rotation center portion 623 is located at substantially the same position as the other end 621b in the direction of the central axis CL1 of the 1 st arm 621.

With this arrangement, the vibration generated by the moment in the direction of rotation in the direction of the center axis CL1 generated in the 1 st arm 621 can be reduced.

Further, on one end side in the direction of the center axis CL1, one end 623a in the direction of the center axis CL1 of the rotation center portion 623 is positioned closer to one end side in the direction of the center axis CL1 than one end 622a in the direction of the center axis CL1 of the 2 nd arm portion 622. On the other end side in the direction of the center axis CL1, the other end 623b in the direction of the center axis CL1 of the rotation center portion 623 is positioned closer to the other end side in the direction of the center axis CL1 than the other end 622b in the direction of the center axis CL1 of the 2 nd arm portion 622.

With this arrangement, the vibration generated by the rotational moment about the depth direction WC generated in the 2 nd arm 622 can be reduced.

In the present embodiment, on one end side in the direction of the center axis CL1, one end 621a in the direction of the center axis CL1 of the 1 st arm portion 621 is positioned closer to one end side in the direction of the center axis CL1 than one end 622a in the direction of the center axis CL1 of the 2 nd arm portion 622. On the other end side in the direction of the center axis CL1, the other end 621b in the direction of the center axis CL1 of the 1 st arm 621 is positioned closer to the other end side in the direction of the center axis CL1 than the other end 622b in the direction of the center axis CL1 of the 2 nd arm 622.

That is, the 1 st arm portion 621 and the 2 nd arm portion 622 are formed at substantially the same position in the center axis CL1 direction.

In this way, the buckling of the rotation center portion 623 can be suppressed by the forces applied to the 1 st arm 621 and the 2 nd arm 622.

In the present embodiment, a roller 613 having substantially the same shape as the roller disclosed in the above-described prior art document is used.

When the roller 613 having such a shape is used, when the roller 613 rotates about the output shaft 52, the roller 613 moves within the concave portion 6214 of the holding arm 6211 along the center axis CL1 while rolling within the concave portion 6214.

In the present invention, the roller 613A shown in fig. 12 to 14 may be used instead of the roller 613, and the movement of the holding arm 6211 when pressed may be simplified.

Specifically, the outer surface 613bA of the roller 613A includes a flat surface 613cA in surface contact with the inner surface 6215 of the recess 6214 formed in the holder arm 6211. Further, the rotation (rolling) of the roller 613A with respect to the eccentric shaft 612 is regulated by the surface contact of the flat surface 613cA with the inner surface 6215 of the concave portion 6214. That is, when the roller 613A is rotated about the output shaft 52, the roller 613A slides along the center axis CL1 without rolling in the concave portion 6214.

Such a roller 613A can have a shape shown in fig. 12 to 14, for example.

The roller 613A shown in fig. 12 to 14 includes a main body portion 6131, and a through hole 613aA penetrating in the protruding direction (longitudinal axis direction ZA) of the eccentric shaft 612 is formed in the main body portion 6131. The eccentric shaft 612 is inserted through the through hole 613aA, whereby the roller 613A is held by the eccentric shaft 612.

Further, the roller 613A includes a protruding portion 6132 that protrudes outward from the outer surface 613bA of the main body portion 6131. When the roller 613A is accommodated in the concave portion 6214 of the holding arm 6211, the outer surface 613bA of the projection 6131 comes into sliding contact with the inner surface 6215 of the concave portion 6214.

Specifically, the projection 6132 includes a1 st projection 6132a, and the 1 st projection 6132a is formed in a substantially band shape so as to project outward in the radial direction of the through hole 613aA along the circumferential direction of the through hole 613 aA. The 1 st projection 6132a is formed to surround the entire circumference of the through hole 613 aA. The flat surfaces 613cA are formed on both sides of the 1 st protruding portion 6132a in the front-rear direction ZC, which is a direction in which the 1 st holding arm 6212 and the 2 nd holding arm 6213 face each other.

Further, the projection 6132 includes a2 nd projection 6132b projecting so as to intersect with the 1 st projection 6132 a.

In the roller 613A shown in fig. 12 to 14, both sides of the main body 6131 in the front-rear direction ZC are flat surfaces perpendicular to the front-rear direction ZC. Further, the 2 nd projecting portions 6132b having the outer surfaces 613bA formed in an arc shape around the center axis CL1 are formed on the pair of flat surfaces.

The outer surface 613bA of the 2 nd projecting portion 6132b has a shape corresponding to the curved shape of the inner surface 6215 of the concave portion 6214 as viewed along the center axis CL 1.

Next, an example of an operation in the case of using the roller 613A shown in fig. 12 to 14 will be described.

First, the power of the electric hair cutting device 1 is turned on to rotate the output shaft 52. When the output shaft 52 is rotated in this manner, the rotating body 611 and the eccentric shaft 612 integrally attached to the output shaft 52 are also rotated in conjunction with the output shaft 52.

Specifically, the eccentric shaft 612 performs a circular motion about the output shaft 52. That is, the eccentric shaft 612 rotates about the output shaft 52. At this time, the roller 613A held by the eccentric shaft 612 also rotates about the output shaft 52. That is, the roller 613A rotates from the position shown in fig. 15B to the position shown in fig. 15F via the position shown in fig. 15D, for example. Further, the roller 613A may be rotated in the opposite direction.

When the roller 613A is also rotated about the output shaft 52 in this manner, the holding arm 6211 that holds the roller 613A also moves in accordance with the rotation of the roller 613A.

At this time, the flat surface 613cA of the roller 613A is brought into surface contact with the inner surface 6215 of the concave portion 6214 (see fig. 16). Therefore, the roller 613A moves within the concave portion 6214 along the central axis CL1 in a state in which rotation relative to the eccentric shaft 612 is restricted within the concave portion 6214 of the holding arm 6211 (without rolling within the concave portion 6214) when rotating about the output shaft 52. Then, by the movement of the roller 613A, the holding arm 6211 is pressed, and the 1 st arm portion 621 reciprocates and rotates about the center axis CL 1. In addition, the roller 613A also reciprocates in the axial direction of the eccentric shaft 612 and rotates about the output shaft 52, similarly to the roller 613.

Further, when the 1 st arm portion 621 reciprocates around the center axis CL1, the rotation center portion 623 formed integrally with the 1 st arm portion 621 and the rotation support shaft 624 integrated with the rotation center portion 623 reciprocate around the center axis CL1 in conjunction. Further, the 2 nd arm portion 622 integrally formed with the 1 st arm portion 621 and the rotation center portion 623 also reciprocates about the center axis CL1 in conjunction with the reciprocating rotational movement of the 1 st arm portion 621 about the center axis CL 1.

Further, since the coupling portion 6221 formed at the tip of the 2 nd arm portion 622 is coupled to the connecting portion 271, the reciprocating rotational motion of the 2 nd arm portion 622 about the center axis CL1 is transmitted to the connecting portion 271 via the coupling portion 6221.

When the roller 613A is at the position shown in fig. 15B, the movable blade 25A is positioned on the upper end side of the movement range R1 (see fig. 15A). When the roller 613A is positioned at the position shown in fig. 15D, the movable blade 25a is positioned on the center side of the movement range R1 (see fig. 15C). When the roller 613A is positioned in the position shown in fig. 15F, the movable blade 25a is positioned on the lower end side of the movement range R1 (see fig. 15E).

In the case where the roller 613A shown in fig. 12 to 14 is used in this manner, the roller 613A rotates about the output shaft 52 while reciprocating linearly in the direction along the center axis CL1 in the inner surface 6215 of the concave portion 6214. In this way, the movement of the roller 613A is simplified, and noise and vibration can be reduced.

Further, an attachment 100 (see fig. 17) for adjusting the length of the cut hair (cut length) is detachably attached to the electric hair cutting device 1.

Fig. 17 illustrates the attachment 100 attached to the electric-powered hair cutting device 1 by being moved relative to the electric-powered hair cutting device 1 in a direction substantially orthogonal to the blade moving direction W, that is, in a rearward direction WC2 of the depth direction WC.

The attachment 100 includes a peripheral wall 101, and the peripheral wall 101 covers the peripheral surface 20a of the head 20 formed around the blade portion 23 over the entire circumference in a state where the attachment 100 is attached to the electric-type hair cutting device 1.

With this arrangement, the peripheral wall 101 of the attachment 100 can be brought into contact with the peripheral surface 20a of the head 20 regardless of the direction in which the electric-type hair cutting device 1 to which the attachment 100 is attached is moved substantially perpendicular to the attaching and detaching direction of the attachment 100. Further, the situation in which the attachment 100 is detached from the electric-powered hair cutting apparatus 1 can be more reliably suppressed.

Further, the accessory 100 includes a comb part (hair grooming part) 102 capable of guiding hair between the fixed blade 24a and the movable blade 25 a. Specifically, a plurality of comb portions 102 are arranged in a row along the blade moving direction W, and an introduction hole 104 is formed between the comb portions 102 adjacent to each other in the blade moving direction W, and the introduction hole 104 can introduce the hair guided by the comb portions 102 to the inside (the blade portion 23 side).

The attachment 100 includes an extension portion 103, and the extension portion 103 covers the outer surface 30a of the handle portion 30 so as to be grippable in a state where the attachment 100 is attached to the electric-type hair cutting device 1.

That is, even when the grip portion is gripped in a state where the attachment 100 is attached to the electric-powered hair cutting device 1, the extension portion 103 covering the grip portion 30 can be gripped together with the grip portion 30.

With this arrangement, the fitting 100 can be prevented from coming off.

Further, a stepped portion 10a is formed in the main body portion 10 of the electric hair cutting device 1, and in a state where the attachment 100 is attached to the electric hair cutting device 1, the end surface 100a of the attachment 100 abuts against the stepped portion 10 a.

Further, since the attachment 100 and the electric-powered hair cutting device 1 are provided with the engaging portion and the engaged portion that engage with each other, the attachment 100 attached to the electric-powered hair cutting device 1 can be more reliably prevented from coming off.

Furthermore, an attachment having a shape other than the attachment 100 shown in fig. 17 may be attached to the electric-powered hair cutting device 1.

[ action, Effect ]

Hereinafter, a characteristic configuration of the electric hair cutting device shown in the above-described embodiment and its modified examples and effects obtained thereby will be described.

(1) In the electric hair cutting device according to the above-described embodiment and the modifications thereof, the angle formed by the moving direction of the movable blade with respect to the fixed blade provided on the head and the longitudinal direction of the handle portion supporting the head is an acute angle, or the moving direction is parallel to the longitudinal direction.

The electric hair cutting device includes a motor and a conversion section that converts a rotational motion of an output shaft of the motor into a reciprocating rotational motion about a central axis line intersecting a direction parallel to the output shaft. The electric hair cutting device includes a connecting portion integrated with the movable blade, the connecting portion being connected to the converting portion and driven by the reciprocating rotational motion transmitted from the converting portion.

Further, the conversion section includes: an eccentric rotating portion having an eccentric shaft disposed at a position eccentric with respect to the output shaft so as to be rotatable about the output shaft, the eccentric rotating portion being rotatably coupled to the output shaft; and an input conversion unit connected to the eccentric shaft so as to be capable of converting the rotational motion of the eccentric shaft into a reciprocating rotational motion.

Further, the input conversion section includes: a rotational center portion having a central axis; and a1 st arm portion connected to the rotation center portion so as to be capable of reciprocating rotational motion about the central axis, and connected to the eccentric shaft. The input conversion unit includes a2 nd arm unit, the 2 nd arm unit reciprocating and rotating about the central axis in conjunction with the 1 st arm unit, and the 2 nd arm unit being connected to the connection unit.

In this case, the reciprocating rotational motion converted by the conversion unit can be directly transmitted to the connection unit integrated with the movable blade, and therefore the structure of the conversion unit can be simplified.

Thus, according to the present invention, it is possible to obtain an electric hair cutting device which can further simplify the structure.

(2) Further, according to the electric-type hair cutting device of the above (1), the center axis of the input converting portion may pass through the output axis of the motor.

In this way, the 1 st arm can be rotated uniformly about the output axis of the motor, and the input conversion unit can be made compact.

(3) Further, according to the electric-type hair cutting device of the above (2), the center axis of the input converting portion may pass through an intersection point of a center plane passing through the center of the moving range of the movable blade and orthogonal to the moving direction of the movable blade and the output axis of the motor.

In this case, the 2 nd arm can be rotated around the center axis in a reciprocating manner uniformly in the moving direction of the movable blade about the projection line of the center plane, and the input conversion unit can be further miniaturized.

(4) Further, according to any one of the electric-type hair cutting devices (1) to (3), an angle formed by the 1 st arm portion and the 2 nd arm portion may be an obtuse angle.

In this way, the input conversion unit suitable for the electric hair cutting device with improved usability can be provided, and the electric hair cutting device 1 can be miniaturized.

(5) Further, according to any one of the above-described (1) to (4), the width of the rotation center portion in the central axis direction may be larger than the width of the 1 st arm portion in the central axis direction and the width of the 2 nd arm portion in the central axis direction.

In this way, the vibrations generated by the moments generated in the 1 st arm part and the 2 nd arm part can be reduced.

[ others ]

The electric hair cutting device of the present invention has been described above, but it is obvious to those skilled in the art that various modifications and improvements can be made without being limited to the above description.

For example, in the above-described embodiment and the modifications thereof, an electric hair cutting device in which an attachment can be detachably attached is exemplified, but an electric hair cutting device in which attachment of an attachment is not assumed may be used.

The specifications (shape, size, layout, etc.) of the head, the handle, and other detailed portions may also be changed as appropriate.

The electric-powered hair cutting device according to the present invention can be applied to various electric-powered hair cutting devices for home use and business use.

Description of the reference numerals

1. An electric type hair cutting device; 20. a head portion; r1, range of motion; p2, central plane; CP1, intersection; 24a, a stationary blade; 25a, a movable blade; 271. a connecting portion; 30. a handle portion; 50. an electric motor; 52. an output shaft; l1, output axis; 60. a conversion section; 610. an eccentric rotation section; 612. an eccentric shaft; 620. an input conversion section; 621. a1 st arm part; 622. a2 nd arm part; 623. a rotation center; CL1, central axis; θ 3, an angle formed by the 1 st arm part and the 2 nd arm part; ZA, the longitudinal axis direction (the longitudinal direction of the handle part: the direction parallel to the output shaft); w, the blade moving direction (moving direction of the movable blade).

Claims

1. An electric hair cutter configured such that an angle formed by a moving direction of a movable blade with respect to a fixed blade provided on a head and a longitudinal direction of a handle portion supporting the head is an acute angle or the moving direction is parallel to the longitudinal direction, wherein,

the electric hair cutting device includes:

an electric motor;

a conversion unit that converts a rotational motion of an output shaft of the motor into a reciprocating rotational motion about a central axis that intersects a direction parallel to the output shaft; and

a connecting portion which is integrated with the movable blade, is connected to the converting portion, and is driven by the reciprocating rotational motion transmitted from the converting portion,

the conversion section includes:

an eccentric rotating portion having an eccentric shaft disposed at a position eccentric to the output shaft so as to be rotatable about the output shaft, the eccentric rotating portion being rotatably coupled to the output shaft; and

an input conversion unit connected to the eccentric shaft so as to be capable of converting a rotational motion of the eccentric shaft into the reciprocating rotational motion,

the input conversion section includes:

a rotating center having the central axis;

a1 st arm portion connected to the rotation center portion so as to be capable of reciprocating rotational motion about the central axis, and connected to the eccentric shaft; and

and a2 nd arm portion that reciprocates around the central axis in conjunction with the movement of the 1 st arm portion, and is coupled to the connecting portion.

2. The electric-type hair cutting device according to claim 1,

the central axis of the input conversion portion passes through an output axis of the motor.

3. The electric-type hair cutting device according to claim 2,

the center axis of the input conversion portion passes through an intersection point of a center plane passing through the center of the moving range of the movable blade and orthogonal to the moving direction of the movable blade and an output axis of the motor.

4. The electric-type hair cutting device according to any one of claims 1 to 3,

the angle formed by the 1 st arm part and the 2 nd arm part is an obtuse angle.

5. The electric-type hair cutting device according to any one of claims 1 to 4,

the width of the rotation center portion in the central axis direction is larger than the width of the 1 st arm portion in the central axis direction and the width of the 2 nd arm portion in the central axis direction.