CN214136135U

CN214136135U - Opening and closing control mechanism of hair trimmer and hair trimmer

Info

Publication number: CN214136135U
Application number: CN202022223544.8U
Authority: CN
Inventors: 不公告发明人
Original assignee: ZHEJIANG HAISHUN ELECTRICAL CO Ltd
Current assignee: ZHEJIANG HAISHUN ELECTRICAL CO Ltd
Priority date: 2020-10-08
Filing date: 2020-10-08
Publication date: 2021-09-07
Anticipated expiration: 2030-10-08

Abstract

The utility model provides a hair trimmer's open and close control mechanism and hair trimmer, hair trimmer has the razor subassembly, open and close control mechanism is connected with the shell body of hair trimmer, open and close control mechanism can drive the razor subassembly and remove between the closed condition and the open mode, when the open mode the relative shell body protrusion of razor subassembly is opened certain angle, by the open mode when to the closed condition, open and close control mechanism drives the portable certain angle of opening of razor subassembly makes the razor subassembly is the open mode. Razor blade open and close control mechanism provide one kind and be different from the current blade and open and close control mechanism's the mode of opening completely, the noise is little when opening, through open and close control mechanism's setting has reduced because the mistake touches the defect that the blade leads to can pop out at once.

Description

Opening and closing control mechanism of hair trimmer and hair trimmer

Technical Field

The utility model relates to a personal care, medical nursing field especially indicate an opening and close control mechanism and hair trimmer of hair trimmer.

Background

The prior art razor units of a conventional shaving razor or hair clipper are in a generally fixed position relative to the body, and some of the razor units are pivotally mounted directly to the outer housing of the razor, and in use, the user manually depresses the razor units to unlock or slide the razor units to an unlocked position, which is accomplished by ejecting the razor units primarily by means of torsion springs mounted to the housing, as disclosed, for example, in application No. 201220583944.2 entitled razor hidden temple mechanism, which includes a housing, a bracket mounted to the housing, and a temple, the housing being pivotally connected to the bracket, the torsion springs driving the bracket in a pivotal motion. That is to say, drive under the effect of torsional spring the relative casing of temple sword rotates, and then realizes opening and accomodating of temple sword. However, since the structure mainly controls the opening of the temple-shaped knife by the torsion force of the torsion spring, when the temple-shaped knife is actually used and is in a closed state from an open state, pressure impact is easily caused to the shell of the shaver and other parts in contact with the temple-shaped knife under the action of instantaneous impact of the torsion force, and the stability of the whole structure of the shaver is easily reduced and the service life of the shaver is reduced; in addition, the torque control type mechanism is easy to generate larger noise in the two instantaneous states of opening and closing; when the user is in slight negligence and touch by mistake, the spring can be popped out immediately under the action of the torsion spring, so that the skin can be injured by mistake due to impact force; besides the support, the open type mode only has two states of complete closing and complete opening, and is inconvenient for users to adjust according to the concave-convex of the skin at different parts when in use. Accordingly, it is considered desirable by those skilled in the art to provide a new and improved hair shaver which addresses the deficiencies of the prior art.

Disclosure of Invention

In view of this, the utility model provides a hair trimmer's start-stop control mechanism and hair trimmer.

In order to achieve the above object, the utility model provides a following technical scheme:

an open-close control mechanism of a hair trimmer is provided, the hair trimmer is provided with a razor component, the open-close control mechanism is connected with a shell body of the hair trimmer and has a closed state and an opened state, the open-close control mechanism can drive the razor component to switch between the closed state and the opened state, the open-close control mechanism comprises a razor guide rail component and a push-button piece, the razor guide rail component is rotationally connected with the push-button piece, and the razor component moves relative to the shell body and rotates relative to the shell body during the process from the closed state to the opened state.

Specifically, the method comprises the following steps:

the razor guide rail assembly is provided with a supporting rotating shaft and a razor guide rail, the supporting rotating shaft is connected between the razor guide rail and the shell body so that the razor guide rail assembly can slide and rotate relative to the shell body, and the razor assembly is connected with the razor guide rail assembly;

the push-twist piece is provided with a push-twist piece body and a gear linkage unit, the gear linkage unit comprises a power input gear arranged on the push-twist piece body and a power output gear arranged on the razor guide rail assembly and meshed with the power input gear, and the push-twist piece drives the power output gear to move when moving so as to drive the razor guide rail assembly to move.

Specifically, the razor guide rail is provided with a first guide rail and a second guide rail which are arranged in an angle mode, and the first guide rail is connected with the second guide rail.

In particular, the razor rail has at least one guide wall forming the first and second rail.

In particular, the razor rail has two oppositely disposed guide walls forming the first and second rails therebetween, the guide walls defining a displacement of the support shaft in a direction perpendicular to the direction of movement of the razor rail assembly.

The razor guide rail assembly comprises a razor guide rail shell and a razor bracket, the razor guide rails are arranged on two sides of the razor guide rail shell, the razor guide rail shell is fixedly connected relative to the razor bracket, and the power output gear is arranged on the razor bracket.

Specifically, the gear linkage unit further comprises a power conversion gear fixed relative to the shell body, and the power conversion gear and the power output gear are both in a tooth row structure.

Specifically, the opening and closing control mechanism further comprises a torsion spring, one end of the torsion spring is fixedly connected with the shell body relatively, and the other end of the torsion spring can move relative to the shell body under the driving of the pushing and twisting piece.

Specifically, the first guide rail extends from an end near the support shaft toward the razor assembly, and the second guide rail extends obliquely upward from an end of the first guide rail toward the razor assembly.

Specifically, the razor guide rail assembly is provided with two rotating connecting arms, the push-twist piece is provided with a rotating connecting part at a position corresponding to the two rotating connecting arms, the rotating connecting arms are provided with a rotating supporting part, and the rotating supporting part is rotatably connected with the rotating connecting part.

Specifically, the shell body is provided with a mounting groove, the razor guide rail assembly and the push-twist piece are both mounted in the mounting groove, two opposite sides of the shell body are provided with guide sliding grooves, and the guide sliding grooves are matched with the razor guide rail assembly.

The utility model also provides a hair trimmer, including razor subassembly and as above arbitrary the control mechanism that opens and close.

Specifically, razor subassembly includes that the razor moves the sword, the hair trimmer still includes power pack, power pack includes driving source, eccentric mechanism, razor and moves the sword goods of furniture for display rather than for use, eccentric mechanism is connected with the driving source, and the razor moves the sword goods of furniture for display rather than for use and is driven and reciprocating motion by eccentric mechanism, and the razor moves the sword and is connected with razor moves the sword goods of furniture for display rather than for use.

Specifically, the hair trimmer further comprises a blade assembly, the blade assembly is provided with a movable blade and a stationary blade, the movable blade is connected with the eccentric mechanism through a movable blade swing part, and the movable blade reciprocates under the driving of the eccentric mechanism.

The beneficial effects of the utility model reside in that: the blade opening and closing control mechanism of the shaver provides an opening mode completely different from the existing blade opening and closing control mechanism, the noise is low when the shaver is opened, and the defect that the blade can be popped out immediately due to the fact that the blade is touched by mistake is reduced through the arrangement of the opening and closing control mechanism; after the razor component is opened for a section through the middle transition rotary moving part, the torsional spring is started to drive the razor moving blade to pop up, so that the use safety is higher; the arrangement of the blade opening and closing control mechanism reduces the formation of a razor component required when the razor component is opened, is favorable for further reducing the whole size of the interior of the razor, saves space and is convenient for a user to operate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the hair trimmer of the present invention;

FIG. 2 is a schematic structural view of the hair trimmer of the present invention showing the construction of the razor assembly in a closed position;

FIG. 3 is a schematic structural view of the hair trimmer of the present invention showing the construction of the razor assembly in an open position;

FIG. 4 is an exploded view of the hair trimmer of the present invention in an open position;

FIG. 5 is a view of the construction of the gear linkage unit with the razor assembly in a closed position;

FIG. 6 is a view of the construction of the gear linkage unit with the razor assembly in the open position;

FIG. 7 is a cross-sectional view taken along the line A-A in FIG. 1;

FIG. 8 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 9 is a cross-sectional view taken along the line C-C in FIG. 1;

fig. 10 is a cross-sectional view of the present invention showing the structure of the power unit;

fig. 11 is an exploded view of the present invention showing the construction of the push button and razor guide rail assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The invention will be further described with reference to the accompanying drawings.

The utility model provides a following technical scheme:

referring to fig. 1 to 11, a hair trimmer 1 comprises a razor unit 2, and an open/close control mechanism 3 connected to a housing 4 of the hair trimmer 1, wherein the open/close control mechanism 3 is capable of moving the razor unit 2 between a closed state and an open state, and the razor unit 2 is protruded and opened at a certain angle relative to the housing 4 in the open state. Specifically, when the razor is switched from the open state to the closed state, the open-close control mechanism 3 drives the razor assembly 2 to be movably opened for a certain angle, so that the razor assembly 2 is in the open state. The movable opening angle means that the razor assembly 2 is not in an open state after rotating around a pivot point as in the prior art, but the razor assembly 2 is simultaneously displaced and rotated under the driving of the opening and closing control mechanism 3. In the following, the hair-cutting apparatus of the present invention will be further described:

the shaver component 2 comprises a movable shaver blade 21 and a static shaver blade 22, the hair trimmer 1 further comprises a power unit 11, the movable shaver blade 21 is driven by the power unit 11 to reciprocate relative to the static shaver blade 22, and the reciprocating motion comprises reciprocating motion, reciprocating rotation and other reciprocating rotary motion. The hair trimmer 1 further has a blade assembly provided with a moving blade and a stationary blade. In this embodiment, the razor unit 2 is a reciprocating razor, as shown in fig. 10, the power unit 11 includes a driving source 111, an eccentric mechanism 112, and a moving blade swing portion 113, the eccentric mechanism 112 is connected to the driving source 111, the moving blade swing portion 113 is driven by the eccentric mechanism 112 to reciprocate, and the moving blade 21 is connected to the moving blade swing portion 113. The driving source 111 may be a motor (e.g., a servo motor), an air cylinder, or the like, and in the present embodiment, the driving source 111 is a motor. Similarly, the movable knife is connected with the eccentric mechanism through a movable knife swing part, and the movable knife reciprocates under the driving of the eccentric mechanism. The eccentric mechanism 112 comprises an eccentric wheel 1121 arranged on an output shaft of the motor and a driving element 1122 connected with the eccentric wheel 1121, the driving element 1122 is connected with the shaver moving blade swing part 113, two ends of the driving element 1122 are limited by grooves on two sides, and the rotating motion of the cam is converted into reciprocating linear motion, so that the reciprocating motion of the shaver moving blade 21 is driven. Therefore, the power unit 11 is mainly arranged to convert eccentric rotation into reciprocating linear motion by using a cam.

Specifically, the open-close control mechanism 3 mainly includes a razor rail assembly 31 and a push-button element 32.

As shown in fig. 4 and 9, the razor rail assembly 31 has a supporting shaft 311 and a razor rail 312, and a mounting groove 42 is formed in the middle of the housing 4 for mounting the razor rail assembly 31 and the push button 32. The supporting shaft 311 is fixed relative to the housing 4, and in this embodiment, the supporting shaft 311 is fixedly disposed on the side wall 411 of the mounting groove 42. Specifically, the supporting shaft 311 is connected between the razor rail assembly 31 and the housing 4 so that the razor rail assembly 31 can rotate relative to the housing 4, the razor rail 312 has a first rail 3121 and a second rail 3122 arranged at an angle, and the first rail 3121 is arranged in contact with the second rail 3122, where if the first rail 3121 and the second rail 3122 are grooves, the groove formed by the first rail 3121 is communicated with the groove formed by the second rail 3122; if the first and

second rails

3121 and 3122 are of a protruding structure, the tail portion of the first rail 3121 is connected with the head portion of the second rail 3122. That is to say, first guide rail 3121 and second guide rail 3122 can be by shell 4 body is concave establishes forms, also can be convex sets up two corresponding wall portions, defines out between two relative wall portions the utility model discloses first guide rail 3121 and second guide rail 3122, consequently, as long as the groove that has the guide effect can both play the effect of the utility model discloses first guide rail 3121 and second guide rail 3122.

The purpose of the razor guide 312 is to guide the opening of the razor assembly 2, on the basis of which, in the actual implementation, the razor guide 312 can also be an actual convex track, and the supporting shaft 311 is provided with a groove matched with the convex track, as long as the supporting shaft 311 and the razor guide 312 can be matched with each other to support the razor guide 31 sliding and rotating along the razor guide 312.

Specifically, referring to fig. 2 and 3, the razor rail assembly 31 includes a razor rail housing 313 and a razor holder 314, the razor rail 312 is disposed on two sides of the razor rail housing 313, and the razor rail housing 313 is fixedly connected with respect to the razor holder 314, and the two housings can be connected and fixed by means of a snap, a bolt, or the like. The razor assembly 2 is connected to a razor rail assembly 31. In order to accommodate the bending deformation of the razor guide rail assembly 31 during the moving-rotating process, the razor guide rail assembly 31 is made of plastic material with better elastic property or metal thin sheet, alloy and the like. In particular, as shown in the drawings of the present invention, the razor guide 312 has two opposite guide walls 3120, and the first guide 3121 and the second guide 3122 are formed between the guide walls 3120. In this embodiment, grooves are formed on both sides of the razor guide housing 313, and the side walls of the grooves form the guide walls 3120 of the present invention. In a specific implementation, the guide walls 3121 may also be provided directly protruding on both sides of the razor rail housing 313. The width of the groove, i.e., the distance between the two guide walls 3120, is matched to the supporting rotation shaft 311, and it is preferable that the supporting rotation shaft 311 can move just inside the groove. Therefore, the guide wall 3120 limits the displacement of the supporting shaft 311 in the direction perpendicular to the moving direction of the razor rail assembly, so that the relative shaking of the razor rail assembly 31 and the housing 4 can be prevented from affecting the stability of the structure. Of course, the razor guide 312 may also be provided with only one guide wall 3120, the guide wall 3120 providing a guiding effect on the movement of the support shaft 311. The guiding wall 3121 may be a continuously disposed wall or a discontinuously disposed wall as long as it can guide the movement of the supporting rotation shaft 311. Specifically, the housing 4 is provided with a mounting groove 42, the razor rail assembly 31 and the push button element 32 are mounted in the mounting groove 42, two opposite sides of the housing 4 are provided with guide sliding grooves 43, the guide sliding grooves 43 are matched with the razor rail assembly 31, specifically, referring to fig. 4 and 9, the bottom of the razor rail housing is arranged in an arc shape, and the bottom of the guide sliding grooves 43 is arranged in an arc shape matched with the bottom of the razor rail housing.

As shown in fig. 4, the knob 32 has a knob body 321, and a gear linkage unit 322, the gear linkage unit 322 includes a power input gear 3221 disposed on the knob body 321, and a power output gear 3222 disposed on the razor rail assembly 31 and engaged with the power input gear 3221, and the power output gear 3222 is mounted on the razor holder 314. When the pushing and twisting member 32 moves, the power output gear 3222 is driven to move, and then the razor guide rail assembly 31 is driven to move. The razor guide rail assembly 31 is pivotally connected to a push button 32. Specifically, the razor assembly 2 is mounted to the end of the razor rail assembly 31 remote from the power input gear 3221. The gear linkage unit 322 further includes a power conversion gear 3223 fixed relative to the housing body 4. As shown in the figure, the inner plate 44 is disposed on the housing body 4, and the power conversion gear 3223 is fixed to the inner plate 44, but the housing body 4 may not be disposed with the inner plate 44, and the power conversion gear 3223 may be directly fixed to the housing body 4, and the power conversion gear 3223 may be mounted on the housing body 4 as a separate component, or may be formed by forming teeth from the housing body 4 to form the power conversion gear 3223. The power conversion gear 3223 and the power output gear 3222 are both in a tooth row structure. The power input gear 3221 is a cylindrical gear, and the power input gear 3221 is rotatably mounted on an inner wall of the torque pushing member body 321. The power output gear 3222 and the power conversion gear 3223 are respectively arranged at two opposite sides of the power input gear 3221. In order to ensure that the power output gear 3222 can still be engaged with the power input gear 3221 after the razor track assembly 31 rotates by a certain angle relative to the housing body 4, the power output gear 3222 is also made of a flexible material with good elastic property, such as a plastic material, a metal sheet, an alloy sheet, and the like, during actual manufacturing. Also, in order to avoid a decrease in the degree of fit between the power input gear 3221 and the power output gear 3222 due to such deformation, an inner frame (not shown) may be further provided, which forms a defining groove that ensures stable fit of the power input gear 3221 and the power output gear 3222.

Specifically, the open-close control mechanism is further provided with a torsion spring 33, one end of the torsion spring 33 is fixedly connected with the shell body 4, and the other end of the torsion spring 33 can move relative to the shell body 4 under the driving of the push-twist piece 32. One end of the torsion spring 33 is connected with the razor rail assembly 31, and the other end of the torsion spring 33 is connected with the push button 32. In practice, the other end of the torsion spring 33 may be connected to the push button 32 or to the razor rail assembly 31. The purpose of the torsion spring 33 is primarily to reduce the force required to push the push button 32 when the razor assembly 2 is pushed out and retracted, to facilitate the transition of the razor assembly between the closed and open states, and to facilitate user operation.

The first guide rail 3121 extends from an end near the support rotation shaft 311 toward the razor assembly 2, and the second guide rail 3122 extends obliquely upward from an end of the first guide rail 3121 toward the razor assembly 2. As shown, the first guide rail 3121 is inclined gradually downwardly during extension to facilitate opening of the razor assembly 2, such that the junction of the first guide rail 3121 and the second guide rail 3122 forms an arcuate corner to facilitate transitioning of the razor assembly 2 between the closed and open positions.

Specifically, as shown in fig. 11, the razor rail assembly 31 has two pivotal connecting arms 315, the two connecting arms 315 are respectively disposed on both sides of the razor rail housing 313, and the two connecting arms 315 extend toward the push button member 32. The push-button member 32 is provided with a rotation connecting portion 316 at a position corresponding to the two rotation connecting arms 315, the rotation connecting arms 315 have a rotation supporting portion 317, and the rotation supporting portion 317 is rotatably connected with the rotation connecting portion 316. In the embodiment of the present invention, the rotation support 317 is cylindrical, but may be spherical, hemispherical, or the like in practical implementation. The rotation connecting portion 316 is an arc-shaped groove disposed on the inner wall of the push-button element 32. The rotational support 317 and rotational connection 316 are arranged such that the razor rail assembly 31 rotates about the rotational connection 316 relative to the push button 32. In practice, however, it is also possible to provide the pivot connection 315 on the push button element 32 and the pivot connection 315 on the razor rail assembly 31.

When the hair trimmer 1 of the present invention is in use, a user pushes the push button element 32 manually, the push button element 32 moves towards the razor assembly 2, the power input gear 3221 mounted on the push button element 32 moves under the driving of the push button element 32, and rotates under the action of the power conversion gear 3223 to drive the power output gear 3222 to rotate, so as to move the razor guide rail assembly 31; the razor guide rail assembly 31 is moved while being rotated clockwise by the razor guide rail 312 to be opened with respect to the housing 4, and the razor assembly 2 mounted on the razor guide rail assembly 31 is also opened. Similarly, when the razor assembly 2 needs to be closed, the pushing and twisting piece 32 is pushed to move away from the razor assembly 2, and the pushing and twisting piece 32 drives the razor guide rail assembly 31 to move and rotate in a resetting manner through the action of the gear linkage unit 322. Torsion spring 33 in the utility model discloses in mainly play supplementary effect that resets and open, at the opening in-process, when torsion spring 33 torsion reachd the critical value, promote razor guide rail set spare 31 pops out, at the closing in-process, when torsion spring 33's one end along with pushing away when turning round piece 32 and remove the torsion critical value, produces decurrent promotion torsion, impels razor guide rail set spare 31 to move down.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An open/close control mechanism for a hair trimmer having a razor assembly connected to a housing of the hair trimmer, the razor assembly having a closed state and an open state, the open/close control mechanism being capable of moving the razor assembly between the closed state and the open state, the open/close control mechanism comprising: the open-close control mechanism comprises a razor guide rail assembly and a push-twist piece, the razor guide rail assembly is rotationally connected with the push-twist piece, and the razor assembly rotates relative to the shell body while moving relative to the shell body in the process from a closed state to an open state.

2. The opening and closing control mechanism of a hair trimmer according to claim 1, wherein:

the razor guide rail assembly is provided with a supporting rotating shaft and a razor guide rail, the supporting rotating shaft is connected between the razor guide rail and the shell body so that the razor guide rail assembly can slide relative to the shell body and rotate the razor assembly to be connected with the razor guide rail assembly;

3. The opening and closing control mechanism of a hair trimmer according to claim 2, wherein: the razor guide rail is provided with a first guide rail and a second guide rail which are arranged in an angle mode, and the first guide rail is connected with the second guide rail.

4. The opening and closing control mechanism of a hair trimmer according to claim 3, wherein: the razor rail has at least one guide wall forming the first and second rails.

5. The opening and closing control mechanism of a hair trimmer according to claim 3, wherein: the razor rail has two oppositely disposed guide walls forming the first and second rails therebetween, the guide walls defining a displacement of the support shaft in a direction perpendicular to the direction of movement of the razor rail assembly.

6. The opening and closing control mechanism of a hair trimmer according to any one of claims 3-5, characterized in that: the razor guide rail assembly comprises a razor guide rail shell and a razor bracket, the razor guide rails are arranged on two sides of the razor guide rail shell, the razor guide rail shell is fixedly connected relative to the razor bracket, and the power output gear is arranged on the razor bracket.

7. The opening and closing control mechanism of a hair trimmer according to any one of claims 2-5, characterized in that: the gear linkage unit further comprises a power conversion gear fixed relative to the shell body, and the power conversion gear and the power output gear are both in a tooth row structure.

8. The opening and closing control mechanism of a hair trimmer according to any one of claims 1-5, characterized in that: the opening and closing control mechanism further comprises a torsion spring, one end of the torsion spring is fixedly connected with the relative shell body, and the other end of the torsion spring can move relative to the shell body under the driving of the pushing and twisting piece.

9. The opening and closing control mechanism of a hair trimmer according to any one of claims 3-5, characterized in that: the first guide rail extends from an end near the support shaft toward the razor assembly, and the second guide rail extends from an end of the first guide rail obliquely upward toward the razor assembly.

10. The opening and closing control mechanism of a hair trimmer according to any one of claims 1-5, characterized in that: the razor guide rail component is provided with two rotary connecting arms, the push-twist piece is provided with a rotary connecting part at the position corresponding to the two rotary connecting arms, the rotary connecting arm is provided with a rotary supporting part, and the rotary supporting part is rotatably connected with the rotary connecting part.

11. The opening and closing control mechanism of a hair trimmer according to any one of claims 1-5, characterized in that: the razor guide rail assembly and the push-twist piece are both arranged in the mounting groove, and two opposite sides of the shell body are provided with guide sliding grooves which are matched with the razor guide rail assembly.

12. A hair trimmer characterized in that: comprising a razor assembly and an opening and closing control mechanism according to any one of claims 1 to 11.

13. A hair trimmer according to claim 12, wherein: the shaver component comprises a shaver moving blade, the hair trimmer further comprises a power unit, the power unit comprises a driving source, an eccentric mechanism and a shaver moving blade swinging part, the eccentric mechanism is connected with the driving source, the shaver moving blade swinging part is driven by the eccentric mechanism to move in a reciprocating mode, and the shaver moving blade is connected with the shaver moving blade swinging part.

14. A hair trimmer according to claim 13, wherein: the hair trimmer further comprises a blade component, the blade component is provided with a movable blade and a stationary blade, the movable blade is connected with the eccentric mechanism through a movable blade swing part, and the movable blade reciprocates under the driving of the eccentric mechanism.