CN120056189A - Reciprocating hair trimmer - Google Patents

Abstract

The present invention relates to a reciprocating hair trimmer, comprising a reciprocating shaver body and a shaver head or a nose hair trimmer head, wherein the body has a power system for driving an output member to rotate, the output member deviates from the center of a motor output shaft in the power system, the shaver head comprises a blade net, a movable blade and a blade head shell, the movable blade is connected to the output member, and the movable blade is driven by the output member to reciprocate linearly relative to the blade net; the nose hair trimmer head comprises a blade head assembly, a transmission member, a blade head shell and a shell seat, the blade head assembly comprises an inner blade and an outer blade, the inner blade is connected to the transmission member, the transmission member has a power transmission part that is off-center, the power transmission part can receive the drive of the output member, thereby driving the transmission member to rotate and reciprocate around the axis of the center, and the inner blade is driven by the transmission member to rotate and reciprocate relative to the outer blade to cut nose hair. This allows users to use the existing reciprocating shaver body, which can be adapted to the nose hair trimmer head at the same time, and drive the inner blade to rotate and reciprocate relative to the outer blade.

Description

Reciprocating hair trimmer

Technical Field

The invention relates to the technical field of hair trimmers, in particular to a reciprocating hair trimmer.

Background

There are many types of hair trimmers, including shavers, hair trimmers, ‌ nose trimmers, etc., each of which is used independently. Such as a reciprocating razor, consists of a body and a cutter head. The cutter head comprises a cutter mesh and a cutter blade, the machine body is provided with a power system, the power system comprises a motor, a battery and a transmission device, the transmission device generally consists of an eccentric wheel or a cam and a connecting rod mechanism, and the power of the motor is transmitted to the cutter blade to realize the horizontal reciprocating motion of the cutter blade. The shaver is driven by power, and the shaver is powered by a motor inside the shaver to convert electric energy into mechanical energy to produce high-speed rotation, and a transmission device converts the rotation of the motor into reciprocating linear motion of the blade.

‌ Nose hair trimmer ‌ is a personal care appliance specifically for trimming nose hair and has the main function of trimming excessive nose hair, ensuring that the nose hair is not exposed, thereby maintaining personal image and nasal hygiene ‌. Nose hair trimmers in the market at present mostly adopt a continuous rotary cutting mode. The nose hair trimmer cutter head comprises a cutter head cover, a cutter head assembly and a transmission piece, wherein the cutter head cover is sleeved on the outer side of the cutter head assembly, a pore is formed in the front end of the cutter head cover, the cutter head assembly comprises a first annular inner tooth cutter and a second annular inner tooth cutter, the first annular inner tooth cutter and the second annular inner tooth cutter comprise annular base plates and ring teeth, the ring teeth are arranged on the inner side of the annular base plates and face the circle center of the annular base plates, the first annular inner tooth cutter is connected with the front end of the cutter head cover, the bottom surface of the first annular inner tooth cutter is attached to the top surface of the second annular inner tooth cutter, the transmission piece is in transmission connection with the second annular inner tooth cutter, and the transmission piece is used for driving the second annular inner tooth cutter to rotate. This approach presents a number of problems during actual use. Because the growth direction and the state of the nose hair are different, the continuously rotating cutting tool bit is difficult to comprehensively and rapidly cut off the nose hair, the conditions that the nose hair is pulled and cut incompletely often occur, discomfort is brought to a user, and the trimming effect is also influenced. Therefore, a new design of the reciprocating hair trimmer is needed to drive the inner knife in the nose hair trimmer knife head to rotate and reciprocate relative to the outer knife so as to solve the problem of poor cutting effect of the existing product.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a reciprocating hair trimmer, so that a user can utilize the existing reciprocating shaver body, can be simultaneously adapted to a nose hair trimmer cutter head and drive an inner cutter to rotate and reciprocate relative to an outer cutter.

The technical scheme is that the reciprocating hair trimmer comprises a reciprocating shaver body and a shaver head or a nose hair trimmer head which can be matched with the shaver body, wherein the reciprocating shaver body is provided with a power system for driving at least one output piece to rotate, the output piece is arranged away from the center of an output shaft of a motor in the power system, the shaver head comprises a cutter net, a movable cutter and a cutter head shell, the movable cutter is in transmission connection with the output piece, the movable cutter is driven by the output piece to reciprocate linearly relative to the cutter net to cut hairs, the nose hair trimmer head comprises a cutter head assembly, a transmission piece, a cutter head shell and a shell seat, the cutter head assembly comprises an inner cutter and an outer cutter, the inner cutter is in transmission connection with the transmission piece, the center of the transmission piece is pivotally connected to the shell seat, the transmission piece is provided with a power transmission part which is away from the center of the transmission piece, the power transmission part can bear the driving of the output piece, so that the transmission piece can be driven by the transmission piece to do rotary reciprocating swinging around the center axis, and the inner cutter is driven by the transmission piece to reciprocate relative to the outer cutter to do rotary swinging.

By adopting the technical scheme, the design of the trimmer gives consideration to the functions of shaving and nose hair trimming, and the function conversion can be realized by changing different cutter heads, so that the trimmer is convenient and practical, and meets the diversified requirements of users.

The power system of the reciprocating shaver body drives the output piece to rotate through the motor output shaft, the design of the output piece enables the output piece to deviate from the center of the motor output shaft, and the layout optimizes the power transmission path. For a reciprocating razor head, the output piece drives the movable cutter to linearly reciprocate in the cutter net, so that beard is effectively sheared, and a smooth and comfortable shaving experience is provided. And for the nose hair trimmer tool bit, the output piece drives the transmission piece to rotate and reciprocate, and the inner knife rotates and reciprocates relative to the outer knife under the drive of the transmission piece, so that the nose hair can be accurately trimmed by the design, and meanwhile, the damage to the skin is avoided.

The invention is still further provided that the inner knife and the transmission member are indirectly transmitted, wherein the swing amplitude of the reciprocating motion of the inner knife is larger than that of the reciprocating motion of the transmission member.

By adopting the further arrangement, the mesh of the razor net of the razor is fine, so that the hair can be effectively cut even if the swing is smaller. The nose hair trimmer has obvious difference in structure, the inner knife and the outer knife are cylindrical, and knife teeth are circumferentially distributed at the end, and as the knife teeth of the head of the nose hair trimmer are distributed more sparsely, the swing amplitude of the inner knife is larger than that of the transmission piece, so that the swing amplitude of the inner knife is improved, and the characteristic of more sparsely distributed knife teeth is adapted. When the inner knife rotates with a large swing, the swing requirement of nose hair trimming can be met.

The invention is further provided with a transmission swing arm between the transmission part and the inner cutter, wherein the transmission swing arm is pivotally connected to the shell seat, one end of the transmission swing arm is in transmission connection with an eccentric transmission part on the transmission part, the other end of the transmission swing arm is in transmission connection with a driving part deviating from the center of the inner cutter, the driving part rotates synchronously with the inner cutter, and the effective transmission arm length I output by the eccentric transmission part is larger than the effective transmission arm length II input by the transmission swing arm or the effective transmission arm length III output by the transmission swing arm is larger than the effective transmission arm length IV input by the driving part.

By adopting the further arrangement, the invention skillfully utilizes the difference between the lengths of the effective transmission arms to generate the effect of improving the swing amplitude of the inner cutter, so that the swing amplitude of the inner cutter is larger than that of the transmission piece, thereby further improving the effect of nose hair trimming.

The invention is further provided that the transmission mode of the transmission swing arm, the eccentric transmission part and the driving part adopts gear meshing transmission or the transmission shaft and the transmission groove are matched for transmission.

By adopting the further arrangement, the stable power transmission can be effectively ensured by the two transmission modes, the trimming efficiency and the trimming quality of the nose hair trimmer are further improved, and a user can feel smoother and more efficient experience when trimming nose hair.

The eccentric transmission part is provided with a transmission shaft A or a transmission groove A, the transmission swing arm is provided with a corresponding transmission groove A or a transmission shaft A deviating from the swing center of the eccentric transmission part, the transmission shaft A is inserted into the transmission groove A to realize transmission connection of a transmission piece and the transmission swing arm, the driving part is provided with a transmission shaft B or a transmission groove B, the transmission swing arm is provided with a corresponding transmission groove B or a transmission shaft B deviating from the swing center of the eccentric transmission part, and the transmission shaft B is inserted into the transmission groove B to realize transmission connection of the driving part and the transmission swing arm.

The eccentric transmission part is provided with a transmission shaft or a transmission groove deviating from the center of the transmission part, the transmission swing arm is provided with a corresponding transmission groove or a transmission shaft deviating from the swing center of the transmission part, when the transmission shaft is accurately inserted into the transmission groove, efficient eccentric transmission connection between the transmission part and the transmission swing arm is realized and is used for driving the transmission swing arm to reciprocate and rotate, and similarly, the driving part is also provided with a transmission shaft or a transmission groove deviating from the center of the inner cutter, and the transmission swing arm is provided with a corresponding transmission groove or a transmission shaft deviating from the swing center of the inner cutter.

The invention further provides that the inner knife is provided with the driving seat, the inner knife and the driving seat synchronously rotate, and the driving part is arranged on the driving seat.

By adopting the further arrangement, the inner knife and the driving seat are convenient to install, and accurate synchronous rotation can be realized on the same axis.

The invention further provides that the inner knife and the transmission piece are directly transmitted, and the inner knife and the transmission piece synchronously rotate.

By adopting the further arrangement, the inner knife and the transmission piece are convenient to install, and accurate synchronous rotation can be realized on the same axis.

The invention is still further provided that the central axis around which the inner knife reciprocates is the same axis as the central axis around which the transmission piece reciprocates.

With the adoption of the further arrangement, the whole nose hair trimmer cutter head moves more compactly and efficiently. The inner knife and the transmission piece reciprocate around the same central axis, so that the energy loss in the movement process is reduced, and the accuracy and stability of trimming are improved. In addition, the coaxial design also helps to reduce friction and wear between the parts, thereby extending the service life of the entire tool bit. When the user uses the pruning device, the user can feel smoother and stable pruning experience.

The invention is still further provided with an oscillating bridge mounted on the motor output shaft, the oscillating bridge having two output members positioned at the same distance from the center of the motor output shaft, wherein the transmission member in the nose hair trimmer cutter head has a pair of power transmission parts, the pair of power transmission parts has driving grooves cooperatively interposed with the output members, and the housing has a through opening below the pair of driving grooves.

By adopting the further arrangement, a pair of power transmission parts of the transmission part and a pair of output parts of the power system can be in accurate transmission fit. The design ensures the balance and stability of the transmission piece in reciprocating motion, reduces vibration and noise, and improves the use experience of users. Meanwhile, the through hole arranged below the pair of power transmission parts provides a space for connecting the pair of power transmission parts with the pair of output pieces of the power system.

The nose hair trimmer is characterized in that the cutter head shell of the nose hair trimmer cutter head can be adapted to the body of the reciprocating shaver, the cutter head shell is provided with a cover part and a bulge part, the cover part is used for being arranged at the upper end of the body of the reciprocating shaver in a covering mode, the cover part also covers the shell seat and the transmission part, the bulge part is internally provided with a channel which is adapted to the outer cutter and is used for the inner cutter and the outer cutter to extend out, the outer cutter is connected and positioned with the bulge part, and the peripheral surface of the bulge part is of a conical structure.

By adopting the further arrangement, the cover part not only can cover the shell seat and the transmission part and play a role in protection, but also can enhance the integrity and the aesthetic degree of the nose hair trimmer cutter head and the reciprocating shaver body. The bulge is used for protecting the columnar inner knife and the columnar outer knife, the channels on the bulge provide protruding spaces for the inner knife and the outer knife, so that the cutter head can smoothly perform trimming work, and the outer peripheral surface of the bulge is designed as a bulge with a conical structure, so that in actual use, a user can conveniently and easily remove attached hair and scraps during cleaning.

Drawings

FIG. 1 is a block diagram of a nose hair trimmer head according to an exemplary embodiment of the present invention;

FIG. 2 is a block diagram of a powertrain system according to an embodiment of the present invention;

FIG. 3 is a block diagram of a nose hair trimmer head according to an exemplary embodiment of the present invention;

FIG. 4 is a first head block diagram of a nose hair trimmer head according to an exemplary embodiment of the present invention wherein the inner cutter is directly driven with the driving member;

FIG. 5 is an exploded view of a first tool tip according to one embodiment of the present invention;

FIG. 6 is a diagram showing the internal structure of a second type of nose hair trimmer head according to the present invention, wherein the swing arm and the two transmission parts are driven by a transmission shaft and a transmission groove in a matched manner;

FIG. 7 is a block diagram of a second head configuration of a nose hair trimmer head according to an exemplary embodiment of the present invention;

FIG. 8 is an exploded view of a second tool tip of the nose hair trimmer tool tip of the embodiment of the invention;

FIG. 9 is an assembly view of a second tool bit inner knife and eccentric drive portion of a tool bit of a nose hair trimmer in accordance with an embodiment of the present invention;

FIG. 10 is a diagram of a second type of head drive swing arm for a nose hair trimmer head in accordance with an embodiment of the present invention;

FIG. 11 is a block diagram of a cutter head housing of a nose hair trimmer cutter head in accordance with an embodiment of the present invention;

FIG. 12 is a third head block diagram of a nose hair trimmer head according to the present invention wherein the swing arm and both drive portions are geared;

FIG. 13 is a view showing the internal structure of a third head of the nose hair trimmer head according to the embodiment of the present invention;

FIG. 14 is a fourth bit block diagram of a nose hair trimmer bit according to the present invention wherein the drive swing arm is geared with the eccentric drive portion and is driven with the drive portion by a drive shaft and drive slot;

Fig. 15 is a view showing the internal structure of a fourth head of the nose hair trimmer head according to the embodiment of the present invention.

Fig. 16 is a block diagram of an assembled shaver head according to an embodiment of the present invention;

fig. 17 is a block diagram of two sets of moving blades of a razor head according to an embodiment of the invention.

In the drawing, a reciprocating shaver body A, an output piece A1, a motor output shaft A2 and an oscillating bridge A3 are shown;

Razor head B, knife net B1, movable knife B2, knife head shell B3, knife rest B4, and driving groove B41;

Nose hair trimmer bit B ', bit assembly B1', inner bit B11', outer bit B12', driving element B2', bit housing B3', cover B31', boss B32', channel B321', housing B4', through-opening B41', power transmission B21', drive slot B211', drive swing arm B5', eccentric transmission B22', drive B111', drive shaft A B ', drive slot A B ', drive slot A B ', drive shaft B B ', drive slot B B64', drive seat B7', latch B8', catch B322', annular clip slot B121'.

Detailed Description

The technical solutions of the present embodiment will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-17, the reciprocating hair trimmer comprises a reciprocating shaver body A and a shaver head B or a nose hair trimmer head B ' which can be adapted to the body, wherein the reciprocating shaver body A is provided with a power system for driving at least one output piece A1 to rotate, the output piece A1 is arranged in a manner of deviating from the center of a motor output shaft A2 in the power system, the shaver head B comprises a cutter net B1, a movable cutter B2 and a cutter head shell B3, the movable cutter B2 is in transmission connection with the output piece A1, the movable cutter B2 is driven by the output piece A1 to reciprocate linearly relative to the cutter net B1, the nose hair trimmer head B ' comprises a cutter head assembly B1', a transmission piece B2', a cutter head shell B3' and a shell seat B4', the cutter head assembly B1 comprises an inner cutter B11' and an outer cutter B12', the inner cutter 11 and the outer cutter 12 are generally cylindrical and distributed on the periphery of the end, the distribution of the cutter teeth is generally sparse, the inner cutter B11' and the transmission piece B2 are in transmission connection with the transmission piece A2 ' and the transmission piece B2' are driven by the transmission piece A2 to reciprocate relative to the cutter head shell B4', and the transmission piece B2 is driven by the transmission piece B2' to rotate, and the transmission piece B is driven by the transmission piece B2' to rotate relative to the transmission piece B2' and the transmission piece B4' is driven by the transmission piece B4' to rotate relative to the transmission piece B2. Specifically, the nose hair trimmer also comprises an oscillating bridge A3 mounted on the motor output shaft A2, wherein the oscillating bridge A3 is provided with two output pieces A1, the two output pieces A1 are positioned at the same distance from the center of the motor output shaft A2, the output pieces are shafts, a transmission piece B2 'in the nose hair trimmer cutter head B' is provided with a pair of power transmission parts B21', the pair of power transmission parts B21' are provided with driving grooves B211 'matched and inserted with the output pieces A1, the shell seat B4' is provided with a through hole B41 'below the pair of driving grooves B211', and the output pieces can be grooves, and the shaft pieces matched with the grooves are arranged on the power transmission parts 21. The movable cutters B2 in the shaver head B are provided with at least two groups and are arranged on respective cutter holders B4, and the two cutter holders B4 are provided with a pair of driving grooves B41 which are matched and inserted with two output pieces A1, and of course, the output pieces can be one.

Specifically, the cutter head housing B3 'of the nose hair trimmer cutter head B' can be adapted to the body of the reciprocating shaver, the cutter head housing B3 'is provided with a cover portion B31' and a bulge portion B32 'which are used for covering the upper end of the body of the reciprocating shaver, the cover portion B31' also covers the housing seat B4 'and the transmission member B2', the bulge portion B32 'is internally provided with a channel B321' which is adapted to the outer cutter and is used for extending the inner cutter and the outer cutter, the outer cutter B12 'is also clamped and positioned with the inner side of the bulge portion B32', or fixed by screws and the like, the peripheral surface of the bulge portion is in a conical structure, the peripheral surface of the bulge portion is gradually narrowed from the bottom to the upper end, the inner side of the bulge portion is provided with a clamping hook B322', and the outer cutter 12 is provided with an annular clamping groove B121' matched with the clamping hook on the periphery. And the cutter head shell B3 'and the shell seat B4' can be integrally or separately arranged.

When the inner knife B11' and the transmission part B2' are in direct transmission, the inner knife B11' and the transmission part B2' are in sleeve joint fit, and synchronous rotation of the inner knife B11' and the transmission part B2' is realized through inserting the bolt B8', or the inner knife B and the transmission part B are in buckle and screw connection, firstly, a preliminary and stable connection foundation is provided for the inner knife and the transmission part through sleeve joint fit, and then the stability of the connection is further enhanced through the addition of the bolt, and in addition, a user can easily detach the bolt so as to assemble and disassemble the inner knife. Or the inner knife and the center of the transmission piece are integrally fixed. The central axis around which the inner knife reciprocates is the same axis as the central axis around which the transmission piece reciprocates. When the nose hair trimmer is used, the nose hair trimmer cutter head of the nose hair trimmer is assembled on the machine body of the reciprocating shaver, when the motor of the power system of the reciprocating shaver is started, the output piece is driven to start rotating, the output piece is in transmission fit with the power transmission part on the transmission piece, so that the transmission piece is driven to rotate and reciprocate around the center of the transmission piece, and then the inner cutter is driven to synchronously rotate and reciprocate, and the nose hair trimmer cuts the nose hair relatively to the static or relatively static outer cutter, so that the nose hair can be effectively trimmed.

When the inner cutter B11 'and the transmission part B2' are indirectly transmitted, the amplitude of the reciprocating motion of the inner cutter B11 'is larger than that of the reciprocating motion of the transmission part B2'. A transmission swing arm B5' is arranged between the transmission part B2' and the inner cutter B11', the transmission swing arm B5' is pivotally connected to the shell seat B4', one end of the transmission swing arm B5' is in transmission connection with an eccentric transmission part B22' on the transmission part B2', the other end of the transmission swing arm B5' is in transmission connection with a driving part B111' deviating from the center of the inner cutter B11', and the driving part B111' and the inner cutter B11' synchronously rotate, and the eccentric transmission part is deviating from the center of the transmission part and is fixedly or integrally arranged. the effective transmission arm length I output by the eccentric transmission part B22 'is larger than the effective transmission arm length II input by the transmission swing arm B5', or the effective transmission arm length III output by the transmission swing arm B5 'is larger than the effective transmission arm length IV input by the driving part B111'. The transmission mode of the transmission swing arm B5' and the eccentric transmission part B22' and the driving part B111' adopts gear meshing transmission or transmission shaft and transmission groove matching transmission. Specifically, the eccentric transmission part B22' has a transmission shaft A B ' or a transmission groove A B ', the transmission swing arm B5' has a corresponding transmission groove A B ' or a transmission shaft A B ' deviating from the swing center, the transmission shaft A B ' is inserted into the transmission groove A B ' to realize transmission connection between the transmission part B2' and the transmission swing arm B5', the driving part B111' has a transmission shaft B B ' or a transmission groove B B ' and the transmission swing arm B5' has a corresponding transmission groove B B ' or a transmission shaft B B ' deviating from the swing center, the transmission shaft B B ' is inserted into the transmission groove B B ' to realize transmission connection between the driving part B111' and the transmission swing arm B5', and further drive the inner cutter B11'. When the transmission piece swings, the transmission swing arm is driven to swing along with the transmission piece through the cooperation of the transmission groove A or the transmission shaft A, and then power is transmitted to the inner cutter through the cooperation of the transmission groove B or the transmission shaft B. Of course, the driving swing arm, the eccentric driving part and the driving part can also be driven by gear engagement, teeth are arranged at the outer edges of the eccentric driving part, the driving swing arm and the driving part, and the gears can be cylindrical gears or be a section of circular arc gears, or can be driven by one of the gears in an engaged way and be driven by the other of the gears in a matched way. The central axis around which the inner knife reciprocates is the same axis as the central axis around which the transmission piece reciprocates, and the inner knife and the transmission piece can be coaxial. Specifically, the inner cutter B11 'is provided with a driving seat B7', the inner cutter B11 'and the driving seat B7' are synchronously rotated by inserting a bolt B8', or are connected by a buckle and a screw, the driving part B111' is integrally arranged on the driving seat B7', or the inner cutter is directly fixed with the driving seat B7' or is integrally arranged. The shell seat B4' is provided with a main shaft B41', the center of the transmission piece B2' is sleeved outside the main shaft B41' in a pivoted mode, a driving seat B7' sleeved at the lower end of the inner cutter B11' is connected to the center of the main shaft B41' in a pivoted mode through a supporting shaft B9', the center of the main shaft B41' is provided with a shaft cavity for inserting the supporting shaft B9', the shell seat B4' is provided with a supporting shaft B42' which is offset from the main shaft B41', and the transmission swing arm is pivoted with the shell seat B4' through the supporting shaft B42 '. When the nose hair trimmer is used, the nose hair trimmer cutter head of the nose hair trimmer is assembled on the machine body of the reciprocating shaver, when the power system of the reciprocating shaver is started, the output piece starts to rotate, the output piece is in transmission fit with the power transmission part on the transmission piece, so that the transmission piece is driven to rotate and reciprocate around the center of the output piece, and then the inner cutter is connected with the eccentric transmission part and the driving part through the transmission swing arm, so that the inner cutter is driven to rotate and reciprocate, and the inner cutter performs shearing action relative to the static or relatively static outer cutter in the reciprocating swinging process, so that nose hair is effectively trimmed.

The design of the trimmer gives attention to the functions of shaving and nose hair trimming, and can realize the function conversion by changing different cutter heads, thereby being convenient and practical and meeting the diversified demands of users.

It should be noted that all directional indicators (such as upper, lower, front, and rear) in the description of the present invention are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to herein as "first," "second," "I," "II," and the like are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features indicated.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "coupled," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Claims (10)

1. A reciprocating hair trimmer is characterized by comprising a reciprocating shaver body (A) and a shaver head (B) or a nose hair trimmer head (B ') which can be matched with the body, wherein the reciprocating shaver body (A) is provided with a power system for driving at least one output piece (A1) to rotate, the output piece (A1) is arranged in a deviating way from the center of a motor output shaft (A2) in the power system, the shaver head (B) comprises a shaver net (B1), a movable cutter (B2) and a cutter head shell (B3), the movable cutter (B2) is in transmission connection with the output piece (A1), the movable cutter (B2) is driven by the output piece (A1) to cut beard in a straight reciprocating way relative to the shaver net (B1), the nose hair trimmer head (B') comprises a cutter head assembly (B1 '), a transmission piece (B2'), a cutter head shell (B3 ') and a shell (B4'), the cutter head assembly (B1 ') comprises an inner cutter (B11') and an outer cutter (B12 '), the inner cutter (B11') is connected with the transmission piece (B2) in a driving way that the power shell (B4 ') is connected with the transmission piece (B2') in a deviating way from the center of the transmission piece (B1 ') and can drive the power shell (B4') in a connecting way on the transmission part (B2 ') in a driving way of the center (21'), thereby driving the transmission part (B2 ') to do rotary reciprocating swing around the central axis, and the inner knife (B11') is driven by the transmission part (B2 ') to be capable of rotary reciprocating swing relative to the outer knife (B12') to cut nose hair.

2. A reciprocating hair trimmer according to claim 1 characterized in that said inner blade (B11 ') is indirectly driven with said driving member (B2'), wherein the amplitude of the reciprocating movement of said inner blade (B11 ') is greater than the amplitude of the reciprocating movement of said driving member (B2').

3. A reciprocating hair trimmer according to claim 2 characterized in that a transmission swing arm (B5 ') is provided between the transmission member (B2') and the inner blade (B11 '), said transmission swing arm (B5') being pivotally coupled to the housing (B4 '), one end of the transmission swing arm (B5') being in transmission connection with an eccentric transmission portion (B22 ') on the transmission member (B2'), the other end being in transmission connection with a driving portion (B111 ') offset from the centre of the inner blade (B11'), said driving portion (B111 ') being in synchronous rotation with the inner blade (B11'), the effective transmission arm length (I) output by said eccentric transmission portion (B22 ') being greater than the effective transmission arm length (II) input by said transmission swing arm (B5'), or the effective transmission arm length (III) output by said transmission swing arm (B5 ') being greater than the effective transmission arm length (IV) input by said driving portion (B111').

4. A reciprocating hair trimmer according to claim 3 characterized in that said driving swing arm (B5 ') is driven in gear engagement with the eccentric driving portion (B22 ') and the driving portion (B111 ') or in co-operation with the driving shaft and the driving slot.

5. A reciprocating hair trimmer according to claim 4 characterized in that the eccentric transmission part (B22 ') has a transmission shaft a (B61') or a transmission groove a (B62 '), the transmission swing arm (B5') having a corresponding transmission groove a (B62 ') or a transmission shaft a (B61') offset from its swing center, the insertion of the transmission shaft a (B61 ') into the transmission groove a (B62') effecting a transmission connection of the transmission member (B2 ') with the transmission swing arm (B5'), the driving part (B111 ') having a transmission shaft B (B63') or a transmission groove B (B64 '), the transmission swing arm (B5') having a corresponding transmission groove B (B64 ') or a transmission shaft B (B63') offset from its swing center, the insertion of the transmission shaft B (B63 ') into the transmission groove B (B64') effecting a transmission connection of the driving part (B111 ') with the transmission swing arm (B5').

6. A reciprocating hair trimmer according to claim 5 characterized in that said inner blade (B11 ') is provided with a drive seat (B7'), the inner blade (B11 ') and the drive seat (B7') being rotated synchronously, said drive portion (B111 ') being provided on the drive seat (B7').

7. A reciprocating hair trimmer according to claim 1 characterized in that said inner blade (B11 ') is in direct drive with said drive member (B2') and that the inner blade (B11 ') rotates in synchronism with the drive member (B2').

8. A reciprocating hair trimmer according to claim 1 or 2 or 7 characterized in that the central axis about which the inner knife (B11 ') reciprocates is the same axis as the central axis about which the transmission member (B2') reciprocates.

9. A reciprocating hair trimmer according to any one of claims 1-7 characterized by further comprising an oscillating bridge (A3) mounted on the motor output shaft (A2), said oscillating bridge (A3) having two output members (A1) thereon and the two output members (A1) being positioned at the same distance from the center of the motor output shaft (A2), wherein the transmission member (B2 ') of the nose hair trimmer bit (B') has a pair of power transmission portions (B21 '), the pair of power transmission portions (B21') having drive slots (B211 ') co-operating with the output members (A1), said housing (B4') having a through opening (B41 ') below the pair of drive slots (B211').

10. A reciprocating hair trimmer according to any one of claims 1-7 characterized in that the bit housing (B3 ') of the nose hair trimmer bit (B ') is adapted to the reciprocating razor body, the bit housing (B3 ') having a cover portion (B31 ') for covering the upper end of the reciprocating razor body and a bulge portion (B32 '), the cover portion (B31 ') further covering the housing seat (B4 ') and the transmission member (B2 '), the bulge portion (B32 ') having a channel (B321 ') inside adapted to the outer blade and from which the inner blade and the outer blade extend, and the outer blade (B12 ') being further positioned in connection with the bulge portion (B32 '), the bulge portion (B32 ') having a tapered outer peripheral surface.