CN114474169A - From tool bit structure and hair trimmer of taking movable safety cover - Google Patents

Abstract

The invention provides a cutter head structure with a movable protective cover and a hair trimmer, wherein the cutter head structure comprises a fixed cutter component, a protective cover and a movable cutter capable of moving back and forth relative to the fixed cutter component, a driving component is arranged between the protective cover and the fixed cutter component and is used for driving the protective cover to move relative to the fixed cutter component so as to realize the switching between an extending state and a retracting state of the protective cover, an inner space for the movable cutter to move back and forth is formed between the protective cover and the fixed cutter component when the protective cover is in the extending state, and the movable cutter is exposed when the protective cover is in the retracting state. According to the hair trimmer, the protective cover and the driving component capable of driving the protective cover to move are directly arranged on the cutter head, so that the cutter head structure can be adapted to cutter bodies of various hair trimmers, the flexibility is high, and the universality is high; the safety cover prevents the movable knife from directly contacting skin in the extending state, and the comb teeth of the movable knife and the fixed knife are exposed in the retracting state, so that the movable knife can conveniently trim hair, the hair is guaranteed to be trimmed cleanly, and the hair shaving effect is good.

Description

From tool bit structure and hair trimmer of taking movable safety cover

Technical Field

The invention relates to the technical field of hair trimmers, in particular to a cutter head structure with a movable protective cover and a hair trimmer.

Background

The cutter head of the hair trimmer comprises a movable cutter and a fixed cutter, the movable cutter can move in a reciprocating mode relative to the fixed cutter to trim hair, because the cutting edge teeth of the movable cutter are sharp, the movable cutter moving in the reciprocating mode easily scratches skin in the hair trimming process, particularly in the vertical trimming process, and after the protective cover preventing the movable cutter from contacting the skin is additionally arranged on the cutter head portion, the hair trimming effect is poor, and the hair trimming is prone to being unclean.

Disclosure of Invention

In order to solve at least one of the above problems, the present invention firstly provides a tool bit structure with a movable protection cover, which includes a fixed knife assembly, a protection cover, and a movable knife that can reciprocate relative to the fixed knife assembly, wherein a driving assembly is disposed between the protection cover and the fixed knife assembly, the driving assembly is used for driving the protection cover to move relative to the fixed knife assembly so as to switch the protection cover between an extended state and a retracted state, when in the extended state, an inner space for the movable knife to reciprocate is formed between the protection cover and the fixed knife assembly, and when in the retracted state, the movable knife is exposed.

Optionally, the fixed knife assembly comprises a fixed knife and a fixed knife frame which are connected with each other, the driving assembly comprises a moving plate which is connected with the fixed knife assembly in a sliding mode in the front-back direction, and the moving plate is connected with the protection cover to drive the protection cover to move so as to enable the protection cover to be switched between the extending state and the retracting state.

Optionally, the left and right sides of movable plate is equipped with the pivot, the safety cover includes broach portion and follow extension arm that both ends extend backward about broach portion rear side, the extension arm be equipped with pivot complex shaft hole, in order to realize the safety cover with movable plate hinged joint each other connects.

Optionally, a torsion spring is sleeved outside the rotating shaft, and two ends of the torsion spring are respectively abutted to the extension arm and the moving plate.

Optionally, the driving assembly further comprises a limiting plate connected with the moving plate, and pressing plates matched with the extension arms are respectively arranged on the left side and the right side of the limiting plate to limit the maximum rotation angle of the protection cover.

Optionally, the limiting plate is further provided with a pressure spring piece and a blocking piece, the pressure spring piece is abutted to the fixed knife, and the blocking piece is perpendicularly connected to the outer side of the pressing plate and is abutted to the outer side face of the extension arm.

Optionally, the extension arm is provided with a locking piece, and the stationary knife rest is provided with a locking groove matched with the locking piece.

Optionally, the stationary knife rest is connected with an adjusting wheel, a gear and a snap spring, the adjusting wheel is provided with a pin shaft for mounting the gear to drive the gear to rotate when the adjusting wheel rotates, the snap spring is connected with the pin shaft to limit the position of the gear in the vertical direction, and the moving plate is provided with a rack connected with the gear in a transmission manner.

Optionally, the regulating wheel is provided with an arc positioning tooth and an arc limiting groove, and the fixed cutter frame is provided with a movable positioning pin matched with the arc positioning tooth and a limiting lug matched with the arc limiting groove.

Compared with the prior art, the cutter head structure with the movable protective cover has the advantages that the protective cover and the driving assembly capable of driving the protective cover to move are directly arranged on the cutter head, so that the cutter head structure can be adaptive to cutter bodies of various hair trimmers, the flexibility is high, and the universality is high; the drive assembly drives the safety cover to switch between the extension state and the retraction state, and can ensure that the safety cover can not interfere the operation of moving the reciprocal hair of sword and cutting respectively when two states, realize utilizing the safety cover to prevent to move sword direct contact skin when extension state, thereby avoid taking place to move the condition of sword scratch skin when cutting immediately, the safety in utilization has been promoted, and realize when the retraction state, make the broach that moves sword and stationary knife expose the setting, the broach can raise hair such as velveteen earlier in advance during normal haircut, so that the hair can enter into the sword position smoothly, conveniently move the sword and prune the hair, ensure that the hair is pruned cleanly, it is effectual to shave the hair.

In addition, the invention provides a hair trimmer comprising the cutter head structure with the movable protective cover.

Compared with the prior art, the hair trimmer of the present invention has the same advantages as the above-mentioned structure of the cutter head with the movable protective cover, and the description thereof is omitted.

Drawings

FIG. 1 is a block diagram of a bit structure of an embodiment of the present invention with the protective cap in an extended state;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a block diagram of a bit structure of an embodiment of the present invention upon rotation of the protective cap open from an extended condition;

FIG. 4 is a block diagram of a bit structure of an embodiment of the present invention with the guard shield in a retracted state;

FIG. 5 is a partial block diagram of a first tool tip configuration in accordance with an embodiment of the present invention;

FIG. 6 is a partial block diagram of a tool tip configuration of an embodiment of the present invention;

FIG. 7 is a block diagram of an adjustment wheel of an embodiment of the present invention;

fig. 8 is a structural diagram of a limiting plate according to an embodiment of the invention.

Description of reference numerals:

1. a stationary knife assembly; 11. fixing a cutter; 12. a fixed tool rest; 121. a locking groove; 122. a movable positioning pin; 123. a limiting bump; 2. a protective cover; 21. a comb-tooth part; 22. an extension arm; 23. a shaft hole; 24. a locking piece; 3. moving a knife; 4. a drive assembly; 41. moving the plate; 411. a rotating shaft; 412. a rack; 42. a torsion spring; 43. a limiting plate; 431. pressing a plate; 432. a pressure spring plate; 433. a baffle plate; 5. an inner space; 6. an adjustment wheel; 61. a pin shaft; 62. arc-shaped positioning teeth; 63. an arc-shaped limiting groove; 7. a gear; 8. and a clamp spring.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the normal use of a product.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the drawings of the embodiments of the present invention, a coordinate system XYZ is provided, in which a forward direction of an X axis represents a left direction, a reverse direction of the X axis represents a right direction, a forward direction of a Y axis represents a front direction, a reverse direction of the Y axis represents a rear direction, a forward direction of a Z axis represents an upper direction, and a reverse direction of the Z axis represents a lower direction.

The embodiment of the invention provides a cutter head structure with a movable protective cover, which is shown in a combined figure 1-5 and comprises a fixed cutter component 1, a protective cover 2 and a movable cutter 3 capable of moving back and forth relative to the fixed cutter component 1, wherein a driving component 4 is arranged between the protective cover 2 and the fixed cutter component 1, the driving component 4 is used for driving the protective cover 2 to move relative to the fixed cutter component 1 so as to realize the switching between the extending state and the retracting state of the protective cover 2, an inner space 5 for the movable cutter 3 to move back and forth is formed between the protective cover 2 and the fixed cutter component 1 when the protective cover is in the extending state, and the movable cutter 3 is exposed when the protective cover is in the retracting state.

The fixed cutter component 1, the movable cutter 3 and the protective cover 2 are all arranged at the cutter head part, and the cutter head part is connected to the front end of the hair trimmer shell; the driving assembly 4 can drive the protective cover 2 to move relative to the fixed cutter assembly 1 so as to realize switching between an extending state and a retracting state, when the protective cover 2 is in the extending state, the protective cover 2 is abutted against the upper surface of the front end of the fixed cutter assembly 1 to form an inner space 5, comb-tooth-shaped cutting teeth of the movable cutter 3 are positioned in the inner space 5, the movable cutter 3 can reciprocate in the inner space 5 during working, particularly, the protective cover 2 plays a role of isolating the movable cutter 3 from skin during vertical shearing, so that the movable cutter 3 is prevented from scratching the skin during hair shearing, and the vertical shearing refers to the operation of shearing hair when the cutter head is perpendicular to the skin, and is suitable for the condition of shaving soft hair or shaving hair; when the movable knife assembly is in an extending state, the front end of the protective cover 2 is flush with the front end of the fixed knife assembly 1, so that the volume of the inner space 5 is as large as possible, the movable knife 3 can conveniently move, and the movable knife assembly is flush arranged, so that the whole structure is more attractive, and the safety is higher; when safety cover 2 is in the withdrawal state for the broach that moves sword 3 and stationary knife subassembly 1 can both expose outside, when normally trimming hair (the state of cutting immediately), broach on the stationary knife subassembly 1 can direct contact skin, and can raise the hair including the fluff, in order to make things convenient for sword 3 to cut the hair, safety cover 2 can be designed to just can hide in the casing when the withdrawal state in addition, makes overall structure neater more pleasing to the eye.

In the cutter head structure with the movable protective cover in the embodiment, the protective cover 2 and the driving component 4 capable of driving the protective cover 2 to move are directly arranged on the cutter head, so that the cutter head structure can be adapted to cutter bodies of various hair trimmers, the flexibility is high, and the universality is high; drive assembly 4 drives safety cover 2 and switches between the state of stretching out and the withdrawal state, and can ensure that safety cover 2 all can not interfere the reciprocal operation of cutting hair of moving sword 3 when two states respectively, realize utilizing safety cover 2 to prevent to move sword 3 direct contact skin when the state of stretching out, thereby avoid taking place to move the condition of sword 3 scratch skin when cutting immediately, the safety in utilization has been promoted, and realize when the withdrawal state, make the broach that moves sword 3 and stationary knife 11 expose the setting, the broach can be raised earlier with hair such as fluff in advance during normal haircut, so that the hair can enter into the position of moving sword 3 smoothly, conveniently move sword 3 and prune the hair, ensure that the hair is pruned cleanly, shave effectually.

Optionally, as shown in fig. 1, fig. 2, and fig. 5, the fixed blade assembly 1 includes a fixed blade 11 and a fixed blade holder 12 that are connected to each other, the driving assembly 4 includes a moving plate 41 that is slidably connected to the fixed blade assembly 1 in a front-rear direction, and the moving plate 41 is connected to the protection cover 2 to move the protection cover 2 so as to switch the protection cover 2 between the extended state and the retracted state.

Wherein, in the process that the movable plate 41 drives the protective cover 2 to switch between the extending state and the retracting state, the protective cover 2 will not interfere with the reciprocating motion of the movable blade 3 all the time, and in the process of switching movement, the protective cover 2 will not touch the movable blade 3, so as to ensure that the protective cover 2 and the movable blade 3 will not be damaged by each other; because move the knife 3 and install in the top of stationary knife 11, and have certain thickness in upper and lower direction, the lower extreme of safety cover 2 is with the upper surface laminating of stationary knife 11 when the state of stretching out, consequently the safety cover 2 switches the in-process of withdrawal state from the state of stretching out, the movable block can be designed to drive safety cover 2 and move along the direction from front to back upwards, in order to ensure that safety cover 2 can not interfere move sword 3 all the time, also can be designed other structures, if drive safety cover 2 and move a distance upwards and then drive safety cover 2 and move backwards to the position of withdrawal state, the distance of wherein rising is greater than the thickness of moving sword 3 in upper and lower direction.

Optionally, as shown in fig. 1, fig. 2, and fig. 5, rotating shafts 411 are disposed on left and right sides of the moving plate 41, the protective cover 2 includes a comb portion 21 and extension arms 22 extending backward from left and right ends of a rear side of the comb portion 21, and the extension arms 22 are provided with shaft holes 23 matched with the rotating shafts 411, so that the protective cover 2 and the moving plate 41 are hinged to each other.

The axial direction of the rotating shaft 411 is consistent with the left-right direction, the shaft hole 23 is formed by integrally molding the tail end of the extension arm 22, the rotating shaft 411 is matched with the shaft hole 23 and then can freely rotate, so that the protective cover 2 is hinged with the moving plate 41, and when the protective cover 2 is switched from an extending state to a retracting state, the protective cover 2 can firstly rotate upwards for a certain angle around the rotating shaft 411 and then is driven by the moving plate 41 to move backwards; a damper may be provided between the rotation shaft 411 and the shaft hole 23 to allow the protection cover 2 to be locked in a locked position in the extended state or the retracted state.

Optionally, as shown in fig. 1, fig. 2, and fig. 5, a torsion spring 42 is sleeved outside the rotating shaft 411, and two ends of the torsion spring 42 respectively abut against the extension arm 22 and the moving plate 41.

Wherein, the extension arm 22 is provided with a step abutting against one end of the torsion spring 42, and the moving plate 41 is provided with a groove abutting against the other end of the torsion spring 42; when the protection cover 2 needs to be switched from the extended state to the retracted state, the torsion of the torsion spring 42 drives the protection cover 2 to rotate upwards around the rotating shaft 411 for opening, and then the protection cover moves backwards into the retracted state under the driving of the moving plate 41; due to the design that the torsion spring 42 is arranged outside the rotating shaft 411, the operation of switching the state of the protection cover 2 is more convenient, the automation degree is high, and under the action of the torsion force of the torsion spring 42, the protection cover 2 can be kept in the state that the fixed knife 11 is separated, so that the protection cover 2 is ensured not to interfere with the movable knife 3 all the time.

Optionally, as shown in fig. 1, fig. 2, fig. 5, and fig. 8, the driving assembly 4 further includes a limiting plate 43 connected to the moving plate 41, and pressing plates 431 respectively disposed on left and right sides of the limiting plate 43 and engaged with the extension arm 22 to limit the maximum rotation angle of the protection cover 2.

The upper surface of the moving plate 41 is provided with a plurality of hot melting columns, and the limiting plate 43 is fixedly connected with the moving plate 41 after being hot melted through the hot melting columns; the two pressing plates 431 are symmetrically arranged on the left side and the right side of the limiting plate 43 and are correspondingly arranged with the upper surface of the rear end of the extension arm 22, when the protective cover 2 is in the extending state, a certain movable gap is formed between the lower surface of the pressing plates 431 and the upper surface of the extension arm 22, when the protective cover 2 needs to be switched to the retracting state from the extending state, the protective cover 2 can rotate upwards around the rotating shaft 411 under the torsion action of the torsion spring 42 after losing the external force of the locking position until the upper surface of the extension arm 22 is abutted to the lower surface of the pressing plates 431, and under the combined action of the torsion force of the torsion spring 42 and the pressure of the pressing plates 431, the protective cover 2 is positioned and then driven to move backwards to the retracting state under the action of the moving plate 41.

In this embodiment, add clamp plate 431 to restriction safety cover 2 upwards rotatory angle, can prevent that the rotatory angle of opening of safety cover 2 is too big, can guarantee again that safety cover 2 can stably keep in an angular position at the in-process that two states switched, stable in structure is reliable.

Optionally, as shown in fig. 1, fig. 2, fig. 5, and fig. 8, the limiting plate 43 is further provided with a pressure spring 432 and a blocking piece 433, the pressure spring 432 abuts against the fixed knife 11, and the blocking piece 433 is vertically connected to the outer side of the pressing plate 431 and abuts against the outer side surface of the extension arm 22.

The blocking piece 433 is formed by vertically extending downwards from the outer side of the pressing plate 431, and the blocking piece 433 can limit the position of the protective cover 2 in the left-right direction, so that the protective cover 2 and the moving plate 41 do not move in the left-right direction, the structure is more compact and firm, the rotating shaft 411 and the shaft hole 23 can be prevented from being separated from each other, and the firmness of the connecting structure is ensured; blocking pieces 433 are arranged on the outer sides of the two pressing plates 431, and the outer side of the pressing plate 431 is the side far away from the moving plate 41. Because the limiting plate 43 is fixedly connected with the moving plate 41 through the hot melting column on the moving plate 41, an assembly virtual position may exist after the limiting plate 43 and the moving plate 41 are connected, the pressure elastic sheet 432 abutted to the upper surface of the fixed knife 11 is arranged at the rear end of the limiting plate 43 to eliminate the assembly virtual position, the mutual position fixation of the limiting plate 43 and the moving plate 41 is ensured, the position of the pressing plate 431 is also ensured, the maximum rotation angle of the protection cover 2 can be kept stable, the consistency of products is better, and the assembly difficulty is reduced.

Alternatively, as shown in fig. 1 and 2, the extension arm 22 is provided with a locking piece 24, and the stationary blade holder 12 is provided with a locking groove 121 matched with the locking piece 24.

Wherein, the locking piece 24 is extended from the end of the extension arm 22, that is, arranged at the hinge joint of the protection cover 2 and the moving plate 41; the locking piece 24 and the locking groove 121 are both provided with guide surfaces so as to facilitate the locking piece 24 to enter and exit the locking groove 121; in the process that the protective cover 2 is switched from the retraction state to the extension state, the moving plate 41 moves forwards to drive the protective cover 2 to move forwards until the locking piece 24 is inserted into the locking groove 121, and at the moment, the protective cover 2 is stressed to rotate downwards around the rotating shaft 411 and is attached to the fixed knife 11, so that the extension state of the protective cover 2 is locked; when the protection cover 2 needs to be switched from the extended state to the retracted state, the moving plate 41 moves backwards to drive the protection cover 2 to move backwards successively, that is, the locking piece 24 moves backwards relative to the locking groove 121, and after the locking piece moves a short distance (the front end of the protection cover 2 and the front end of the movable blade 3 are separated by a certain distance, the protection cover 2 does not touch the movable blade 3 when moving backwards by a short distance), the locking piece 24 is separated from the locking groove 121, at this time, the protection cover 2 rotates upwards around the rotating shaft 411 under the external force, and then the moving plate 41 continues to drive the protection cover 2 to move backwards to the retracted state; the locking holder 12 is a plastic member, and the locking groove 121 has a certain deformation resistance so that the locking piece 24 can enter and exit the locking groove 121.

In this embodiment, set up locking piece 24 and locking groove 121 of mutually supporting for safety cover 2 can be locked in the state of stretching out, rotate with restriction safety cover 2, and safety cover 2 can prevent to move sword 3 contact skin when guaranteeing to cut immediately, has improved the security.

Optionally, as shown in fig. 1, fig. 2, fig. 5, fig. 6, and fig. 7, the fixed tool holder 12 is connected to an adjusting wheel 6, a gear 7, and a snap spring 8, the adjusting wheel 6 is provided with a pin 61 for mounting the gear 7, so as to enable the adjusting wheel 6 to rotate, the gear 7 is driven to rotate, the snap spring 8 is connected to the pin 61 to limit the position of the gear 7 in the up-down direction, and the moving plate 41 is provided with a rack 412 in transmission connection with the gear 7.

Wherein, a limit is arranged between the pin shaft 61 of the adjusting wheel 6 and the gear 7, so that the two can rotate synchronously; one end of the clamp spring 8 is fixedly connected with the fixed cutter frame 12, and the other end of the clamp spring is clamped with the top end of the pin shaft 61, so that the position of the gear 7 in the vertical direction is limited, and stable transmission between the gear 7 and the rack 412 is ensured; the adjustment wheel 6 is located outside the positioning frame 12, and when the user rotates the adjustment wheel 6, the gear 7 is in meshed transmission with the rack 412, so that the moving plate 41 can be moved in the front-rear direction.

Optionally, as shown in fig. 1, fig. 2, fig. 5, fig. 6, and fig. 7, the adjusting wheel 6 is provided with an arc-shaped positioning tooth 62 and an arc-shaped limiting groove 63, and the stationary knife holder 12 is provided with a movable positioning pin 122 engaged with the arc-shaped positioning tooth 62 and a limiting protrusion 123 engaged with the arc-shaped limiting groove 63.

The movable positioning pin 122 has certain elasticity in the vertical direction, and the arc-shaped positioning teeth 62 have a plurality of grooves which are adjacently arranged and abutted against the movable positioning pin 122, so that the adjusting wheel 6 has a plurality of positioning points, that is, the protective cover 2 can be positioned at each position; the arc-shaped limiting groove 63 is matched with the limiting lug 123, so that the adjusting wheel 6 can be limited at the limiting position, the rotation passing is prevented, the limiting position of the protection cover 2 in movement is ensured to be in an extending state and a retracting state, and the user can conveniently determine the positions of the two states.

Another embodiment of the present invention provides a hair trimmer comprising a blade structure with a removable protective cover as described above.

According to the hair trimmer disclosed by the invention, the protective cover 2 and the driving component 4 capable of driving the protective cover 2 to move are directly arranged on the cutter head, so that the cutter head structure can be adapted to cutter bodies of various hair trimmers, the flexibility is high, and the universality is high; drive assembly 4 drives safety cover 2 and switches between the state of stretching out and the state of retracting, and can ensure that safety cover 2 all can not interfere the operation of moving sword 3 reciprocal hair of cutting when two states respectively, realize utilizing safety cover 2 to prevent to move sword 3 direct contact skin when the state of stretching out, thereby avoid taking place to move the condition of sword 3 scratch skin when the vertical shear, the safety in utilization has been promoted, and realize when the state of retracting, make the broach that moves sword 3 and stationary knife 11 expose the setting, the broach can be raised earlier with hair such as fluff in advance during normal haircut, so that the hair can enter into smoothly and move sword 3 position, conveniently move sword 3 and prune the hair, ensure that the hair is pruned cleanly, shave effectually.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.

Claims (10)

1. The utility model provides a from tool bit structure of taking movable safety cover, its characterized in that includes stationary knife subassembly (1), safety cover (2) and can for stationary knife subassembly (1) reciprocating motion moves sword (3), safety cover (2) with be equipped with drive assembly (4) between stationary knife subassembly (1), drive assembly (4) are used for driving safety cover (2) for stationary knife subassembly (1) removes in order to realize safety cover (2) switch between the state of stretching out and withdrawal state, when being in during the state of stretching out, safety cover (2) with be formed with the confession between stationary knife subassembly (1) move sword (3) reciprocating motion's inner space (5), when being in during the withdrawal state, move sword (3) and expose the setting.

2. The cutter head structure with the movable protective cover is characterized in that the fixed cutter assembly (1) comprises a fixed cutter (11) and a fixed cutter frame (12) which are connected with each other, the driving assembly (4) comprises a moving plate (41) which is connected with the fixed cutter assembly (1) in a sliding mode in the front-back direction, and the moving plate (41) is connected with the protective cover (2) to drive the protective cover (2) to move so as to achieve switching of the protective cover (2) between the extending state and the retracting state.

3. The cutter head structure with the movable protective cover is characterized in that rotating shafts (411) are arranged on the left side and the right side of the moving plate (41), the protective cover (2) comprises comb-tooth parts (21) and extension arms (22) extending backwards from the left end and the right end of the rear side of the comb-tooth parts (21), and the extension arms (22) are provided with shaft holes (23) matched with the rotating shafts (411) so as to realize the hinged connection of the protective cover (2) and the moving plate (41).

4. The cutter head structure with the movable protective cover as claimed in claim 3, wherein a torsion spring (42) is sleeved outside the rotating shaft (411), and two ends of the torsion spring (42) are respectively abutted with the extension arm (22) and the moving plate (41).

5. The cutter head structure with the movable protective cover is characterized in that the driving assembly (4) further comprises a limiting plate (43) connected with the moving plate (41), and the left side and the right side of the limiting plate (43) are respectively provided with a pressing plate (431) matched with the extension arm (22) so as to limit the maximum rotation angle of the protective cover (2).

6. The cutter head structure with the movable protective cover as claimed in claim 5, wherein the limiting plate (43) is further provided with a pressure spring (432) and a stop piece (433), the pressure spring (432) abuts against the fixed cutter (11), and the stop piece (433) is vertically connected with the outer side of the pressure plate (431) and abuts against the outer side surface of the extension arm (22).

7. Cutter head structure with movable protection cover according to claim 3, characterized in that the extension arm (22) is provided with a locking piece (24), and the stationary cutter holder (12) is provided with a locking groove (121) matching with the locking piece (24).

8. The cutter head structure with the movable protective cover as claimed in any one of claims 2-7, wherein the fixed cutter frame (12) is connected with an adjusting wheel (6), a gear (7) and a clamp spring (8), the adjusting wheel (6) is provided with a pin (61) for mounting the gear (7) so as to drive the gear (7) to rotate when the adjusting wheel (6) rotates, the clamp spring (8) is connected with the pin (61) so as to limit the position of the gear (7) in the up-down direction, and the moving plate (41) is provided with a rack (412) in transmission connection with the gear (7).

9. The cutter head structure with the movable protective cover according to claim 8, wherein the adjusting wheel (6) is provided with an arc-shaped positioning tooth (62) and an arc-shaped limiting groove (63), and the fixed cutter frame (12) is provided with a movable positioning pin (122) matched with the arc-shaped positioning tooth (62) and a limiting convex block (123) matched with the arc-shaped limiting groove (63).

10. A hair trimmer comprising a blade structure with a removable protective cover as claimed in any one of claims 1 to 9.

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