A cutter head structure with a movable protective cover and a hair trimmer

Abstract

The present invention provides a cutter head structure and a hair trimmer with a movable protective cover. The cutter head structure includes a fixed blade assembly, a protective cover, and a movable blade that can reciprocate relative to the fixed blade assembly. A drive assembly is provided between the protective cover and the fixed blade assembly. The drive assembly is used to drive the protective cover to move relative to the fixed blade assembly to switch the protective cover between an extended state and a retracted state. When in the extended state, an internal space for the movable blade to reciprocate is formed between the protective cover and the fixed blade assembly. When in the retracted state, the movable blade is exposed. The present invention directly provides the protective cover and the drive assembly that can drive the protective cover to move on the cutter head, so that the cutter head structure can adapt to the blades of various hair trimmers, with high flexibility and strong versatility. When in the extended state, the protective cover prevents the movable blade from directly contacting the skin. When in the retracted state, the comb teeth of the movable blade and the fixed blade are exposed, making it convenient for the movable blade to trim hair, ensuring that the hair is trimmed cleanly and the shaving effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of hair trimmers, and in particular to a cutter head structure with a movable protective cover and a hair trimmer. Background Art

[0002] The cutter head of a hair trimmer includes a movable cutter and a fixed cutter. The movable cutter can move back and forth relative to the fixed cutter to trim hair. Since the teeth of the movable cutter are relatively sharp, the reciprocating movable cutter can easily scratch the skin during hair trimming, especially when trimming vertically. Moreover, after adding a protective cover to the cutter head to prevent the movable cutter from contacting the skin, the hair trimming effect is poor, and it is easy to not cut cleanly. Summary of the Invention

[0003] In order to solve at least one aspect of the above problems, the present invention first provides a cutter head structure with a movable protective cover, comprising a fixed knife assembly, a protective cover and a movable knife that can move back and forth relative to the fixed knife assembly. A drive assembly is provided between the protective cover and the fixed knife assembly, and the drive assembly is used to drive the protective cover to move relative to the fixed knife assembly to realize the switching of the protective cover between an extended state and a retracted state. When in the extended state, an inner space for the movable knife to move back and forth is formed between the protective cover and the fixed knife assembly. When in the retracted state, the movable knife is exposed.

[0004] Optionally, the fixed knife assembly includes a fixed knife and a fixed knife holder connected to each other, and the driving assembly includes a movable plate slidably connected to the fixed knife assembly in the front and rear directions, and the movable plate is connected to the protective cover to drive the protective cover to move so as to realize the switching of the protective cover between the extended state and the retracted state.

[0005] Optionally, a rotating shaft is provided on the left and right sides of the movable plate, and the protective cover includes a comb tooth portion and extension arms extending backward from the left and right ends of the rear side of the comb tooth portion, and the extension arms are provided with an axial hole that cooperates with the rotating shaft to realize the mutual hinged connection between the protective cover and the movable plate.

[0006] Optionally, a torsion spring is externally connected to the rotating shaft, and two ends of the torsion spring are respectively in contact with the extension arm and the movable plate.

[0007] Optionally, the driving assembly further comprises a limit plate connected to the movable plate, and the left and right sides of the limit plate are respectively provided with pressure plates cooperating with the extension arm to limit the maximum rotation angle of the protective cover.

[0008] Optionally, the limiting plate is further provided with a pressure spring sheet and a blocking sheet, the pressure spring sheet abuts against the fixed knife, and the blocking sheet is vertically connected to the outer side of the pressure plate and abuts against the outer side surface of the extension arm.

[0009] Optionally, the extension arm is provided with a locking piece, and the fixed knife holder is provided with a locking groove that cooperates with the locking piece.

[0010] Optionally, the fixed knife holder is connected to an adjusting wheel, a gear and a retaining spring, the adjusting wheel is provided with a pin shaft for mounting the gear so that the gear can be driven to rotate when the adjusting wheel rotates, the retaining spring is connected to the pin shaft to limit the position of the gear in the up and down directions, and the movable plate is provided with a rack connected to the gear transmission.

[0011] Optionally, the adjusting wheel is provided with arc-shaped positioning teeth and an arc-shaped limiting groove, and the fixed tool holder is provided with a movable positioning pin cooperating with the arc-shaped positioning teeth and a limiting protrusion cooperating with the arc-shaped limiting groove.

[0012] Compared with the prior art, the cutter head structure with a built-in movable protective cover in the present invention has a protective cover directly provided on the cutter head and a driving assembly that can drive the protective cover to move, so that the cutter head structure can adapt to the blades of various hair trimmers, with high flexibility and strong versatility; the driving assembly drives the protective cover to switch between the extended state and the retracted state, and can ensure that the protective cover does not interfere with the reciprocating operation of the movable knife to cut hair in both states, so that the protective cover is used to prevent the movable knife from directly contacting the skin in the extended state, thereby avoiding the situation where the movable knife scratches the skin during vertical shearing, improving the safety of use, and realizing that in the retracted state, the comb teeth of the movable knife and the fixed knife are exposed, and the comb teeth can pre-lift soft hair and other hair during normal haircutting so that the hair can smoothly enter the movable knife position, making it convenient for the movable knife to trim the hair, ensuring that the hair is trimmed cleanly and the shaving effect is good.

[0013] In addition, the present invention provides a hair trimmer including the above-mentioned cutter head structure with a movable protective cover.

[0014] Compared with the prior art, the hair trimmer of the present invention and the cutter head structure with the above-mentioned movable protective cover have the same advantages as those of the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the cutter head structure of an embodiment of the present invention when the protective cover is in an extended state;

[0016] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0017] Figure 3 This is a structural diagram of the cutter head structure of an embodiment of the present invention when the protective cover is just rotated open from the extended state;

[0018] Figure 4 This is a structural diagram of the cutter head structure according to an embodiment of the present invention when the protective cover is in a retracted state;

[0019] Figure 5 The local structure of the cutter head structure of the embodiment of the present invention Figure 1 ;

[0020] Figure 6 The local structure of the cutter head structure of the embodiment of the present invention Figure 2 ;

[0021] Figure 7 A structural diagram of an adjustment wheel according to an embodiment of the present invention;

[0022] Figure 8 2 is a structural diagram of a limiting plate according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Fixed knife assembly; 11. Fixed knife; 12. Fixed knife holder; 121. Locking slot; 122. Movable positioning pin; 123. Limiting protrusion; 2. Protective cover; 21. Comb tooth portion; 22. Extension arm; 23. Shaft hole; 24. Locking plate; 3. Moving knife; 4. Driving assembly; 41. Moving plate; 411. Rotating shaft; 412. Rack; 42. Torsion spring; 43. Limiting plate; 431. Pressure plate; 432. Pressure spring; 433. Baffle; 5. Inner space; 6. Adjusting wheel; 61. Pin shaft; 62. Arc-shaped positioning tooth; 63. Arc-shaped limiting slot; 7. Gear; 8. Circlip. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate positions or location relationships based on the positions or location relationships during normal use of the product.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. A coordinate system XYZ is provided in the drawings of the embodiments of the present invention, wherein the positive direction of the X-axis represents the left, the negative direction of the X-axis represents the right, the positive direction of the Y-axis represents the front, the negative direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom.

[0028] The embodiment of the present invention provides a cutter head structure with a movable protective cover, Figures 1 to 5As shown, it includes a fixed knife assembly 1, a protective cover 2 and a movable knife 3 that can reciprocate relative to the fixed knife assembly 1. A driving assembly 4 is provided between the protective cover 2 and the fixed knife assembly 1. The driving assembly 4 is used to drive the protective cover 2 to move relative to the fixed knife assembly 1 to realize the switching of the protective cover 2 between the extended state and the retracted state. When in the extended state, an inner space 5 for the reciprocating movement of the movable knife 3 is formed between the protective cover 2 and the fixed knife assembly 1. When in the retracted state, the movable knife 3 is exposed.

[0029] Among them, the fixed knife assembly 1, the movable knife 3 and the protective cover 2 are all arranged on the cutter head part, and the cutter head part is connected to the front end position of the hair trimmer housing; the driving assembly 4 can drive the protective cover 2 to move relative to the fixed knife assembly 1 to realize switching between the extended state and the retracted state. When the protective cover 2 is in the extended state, the protective cover 2 abuts against the front upper surface of the fixed knife assembly 1 to form an inner space 5, and the comb-shaped blade teeth of the movable knife 3 are located in the inner space 5. When working, the movable knife 3 can move back and forth in the inner space 5, especially when cutting vertically, the protective cover 2 plays a role in isolating the movable knife 3 from the skin, thereby preventing the movable knife 3 from scratching the skin when trimming hair. Vertical cutting refers to trimming hair when the knife head is perpendicular to the skin. The trimming operation is suitable for shaving soft hair or shaving all hair; when in the extended 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 internal space 5 is as large as possible, which is convenient for the movement of the movable knife 3, and the flush setting makes the overall structure more beautiful and safer; when the protective cover 2 is in the retracted state, the comb teeth of the movable knife 3 and the fixed knife assembly 1 can be exposed. When trimming hair normally (non-standing cutting state), the comb teeth on the fixed knife assembly 1 can directly contact the skin and can lift up the hair including soft hair to facilitate the movable knife 3 to cut the hair. In addition, when the protective cover 2 is in the retracted state, it can be designed to be hidden in the shell, making the overall structure more neat and beautiful.

[0030] The blade head structure with a movable protective cover in this embodiment has a protective cover 2 directly provided on the blade head and a driving component 4 that can drive the protective cover 2 to move, so that the blade head structure can adapt to the blade bodies of various hair trimmers, with high flexibility and strong versatility; the driving component 4 drives the protective cover 2 to switch between the extended state and the retracted state, and can ensure that the protective cover 2 does not interfere with the reciprocating operation of the movable blade 3 to cut hair in the two states, so that the protective cover 2 can prevent the movable blade 3 from directly contacting the skin when the movable blade 3 is in the extended state, thereby avoiding the situation that the movable blade 3 scratches the skin when cutting vertically, improving the safety of use, and realizing that in the retracted state, the comb teeth of the movable blade 3 and the fixed blade 11 are exposed, and the comb teeth can pre-lift soft hair and other hair during normal haircutting so that the hair can smoothly enter the position of the movable blade 3, making it convenient for the movable blade 3 to trim the hair, ensuring that the hair is trimmed cleanly and the shaving effect is good.

[0031] Optionally, combined Figure 1 、 Figure 2 、 Figure 5 As shown, the fixed knife assembly 1 includes a fixed knife 11 and a fixed knife holder 12 connected to each other, and the driving assembly 4 includes a movable plate 41 slidably connected to the fixed knife assembly 1 in the front and rear directions, and the movable plate 41 is connected to the protective cover 2 to drive the protective cover 2 to move so as to realize the switching of the protective cover 2 between the extended state and the retracted state.

[0032] Among them, in the process of driving the protective cover 2 to switch between the extended state and the retracted state, the protective cover 2 will never interfere with the reciprocating motion of the movable knife 3, and the protective cover 2 will not touch the movable knife 3 during the switching movement, so as to ensure that the protective cover 2 and the movable knife 3 will not hurt each other; since the movable knife 3 is installed above the fixed knife 11 and has a certain thickness in the up and down directions, the lower end of the protective cover 2 is in contact with the upper surface of the fixed knife 11 when in the extended state. Therefore, in the process of switching the protective cover 2 from the extended state to the retracted state, the movable block can be designed to drive the protective cover 2 to move in the front-down-back-up direction to ensure that the protective cover 2 will never interfere with the movable knife 3. It can also be designed as other structures, such as first driving the protective cover 2 upward for a distance and then driving the protective cover 2 backward to the retracted position, wherein the rising distance is greater than the thickness of the movable knife 3 in the up and down directions.

[0033] Optionally, combined Figure 1 、 Figure 2 、 Figure 5 As shown, a rotating shaft 411 is provided on the left and right sides of the movable plate 41, and the protective cover 2 includes a comb tooth portion 21 and an extension arm 22 extending backward from the left and right ends of the rear side of the comb tooth portion 21, and the extension arm 22 is provided with an axial hole 23 that cooperates with the rotating shaft 411 to realize the mutual hinged connection between the protective cover 2 and the movable plate 41.

[0034] Among them, the axial direction of the rotating shaft 411 is consistent with the left and right directions, and the shaft hole 23 is integrally formed by the end of the extension arm 22. The rotating shaft 411 and the shaft hole 23 can rotate freely after matching, so that the protective cover 2 and the movable plate 41 are hingedly connected. In this way, when the protective cover 2 switches from the extended state to the retracted state, the protective cover 2 can first rotate upward around the rotating shaft 411 for a certain angle, and then move backward under the drive of the movable plate 41. This design not only has small requirements for the overall space of the cutter head structure and a simple structure, but also can ensure that the protective cover 2 will not interfere with the movable knife 3 when it moves; damping can be set between the rotating shaft 411 and the shaft hole 23 so that the protective cover 2 can be locked in position when in the extended state or the retracted state.

[0035] Optionally, combined Figure 1 、 Figure 2 、 Figure 5As shown, a torsion spring 42 is externally connected to the rotating shaft 411 , and two ends of the torsion spring 42 are respectively in contact with the extension arm 22 and the movable plate 41 .

[0036] Among them, the extension arm 22 is provided with a step that abuts against one end of the torsion spring 42, and the movable plate 41 is provided with a groove that abuts against the other end of the torsion spring 42; when the protective cover 2 needs to be switched from the extended state to the retracted state, the torsion force of the torsion spring 42 will drive the protective cover 2 to rotate upward around the rotating shaft 411 to open, and then move backward to the retracted state under the drive of the movable plate 41; this design of arranging the torsion spring 42 outside the rotating shaft 411 makes the state switching operation of the protective cover 2 more convenient and highly automatic, and under the torsion force of the torsion spring 42, the protective cover 2 can remain in a state of being detached from the fixed knife 11, thereby ensuring that the protective cover 2 does not interfere with the movable knife 3 at all times.

[0037] Optionally, combined Figure 1 、 Figure 2 、 Figure 5 、 Figure 8 As shown, the driving assembly 4 further includes a limit plate 43 connected to the movable plate 41 , and a pressure plate 431 cooperating with the extension arm 22 is provided on the left and right sides of the limit plate 43 to limit the maximum rotation angle of the protective cover 2 .

[0038] Among them, the upper surface of the movable plate 41 is provided with multiple heat-melting columns, and the limit plate 43 is fixedly connected to the movable plate 41 after being hot-melted by the heat-melting columns; the two pressure plates 431 are symmetrically arranged on the left and right sides of the limit plate 43, and are arranged corresponding to the upper surface of the rear end of the extension arm 22. When the protective cover 2 is in the extended state, the lower surface of the pressure plate 431 and the upper surface of the extension arm 22 are separated by a certain movable gap. When the protective cover 2 needs to be switched from the extended state to the retracted state, the protective cover 2 loses the external force of the locking position and can rotate upward around the rotating shaft 411 under the torsion of the torsion spring 42 until the upper surface of the extension arm 22 abuts against the lower surface of the pressure plate 431. Under the combined action of the torsion of the torsion spring 42 and the pressure of the pressure plate 431, the protective cover 2 is positioned, and then driven to move backward to the retracted state under the action of the movable plate 41.

[0039] In this embodiment, a pressure plate 431 is added to limit the upward rotation angle of the protective cover 2, which can prevent the protective cover 2 from rotating open too large an angle and ensure that the protective cover 2 can stably maintain an angular position during the switching between the two states, and the structure is stable and reliable.

[0040] Optionally, combined Figure 1 、 Figure 2 、 Figure 5 、 Figure 8As shown, the limiting plate 43 is further provided with a pressure spring piece 432 and a blocking piece 433 . The pressure spring piece 432 abuts against the fixed knife 11 , and the blocking piece 433 is vertically connected to the outer side of the pressure plate 431 and abuts against the outer side surface of the extension arm 22 .

[0041] The baffle 433 extends vertically downward from the outer side of the pressure plate 431. The baffle 433 can limit the position of the protective cover 2 in the left and right directions, so that there will be no left and right movement between the protective cover 2 and the movable plate 41, making the structure more compact and firm. It can also prevent the rotation shaft 411 and the shaft hole 23 from being separated from each other, thereby ensuring the firmness of the connection structure. The baffle 433 is provided on the outer side of each of the two pressure plates 431. The outer side of the pressure plate 431 refers to the side away from the movable plate 41. Since the limit plate 43 is fixedly connected to the movable plate 41 by the hot melt column on the movable plate 41, there may be an assembly gap after the two are connected. Therefore, a pressure spring 432 is provided at the rear end of the limit plate 43 to abut against the upper surface of the fixed blade 11 to eliminate the assembly gap and ensure that the relative position of the limit plate 43 and the movable plate 41 is fixed. That is, the position of the pressure plate 431 is ensured, so that the maximum rotation angle of the protective cover 2 can be kept stable, the product consistency is improved, and the assembly difficulty is reduced.

[0042] Optionally, combined Figure 1 、 Figure 2 As shown, the extension arm 22 is provided with a locking piece 24 , and the fixed blade holder 12 is provided with a locking groove 121 that cooperates with the locking piece 24 .

[0043] Among them, the locking piece 24 is extended from the end of the extension arm 22, that is, it is set at the hinge of the protective cover 2 and the movable plate 41; the locking piece 24 and the locking groove 121 are both provided with a guide surface to facilitate the locking piece 24 to enter and exit the locking groove 121; in the process of switching the protective cover 2 from the retracted state to the extended state, the movable plate 41 moves forward to drive the protective cover 2 forward until the locking piece 24 is inserted into the locking groove 121, at this time, the protective cover 2 is forced to rotate downward around the rotating shaft 411 and fit into the fixed knife 11, completing the locking of the protective cover 2 in the extended state; when it is necessary to switch the protective cover 2 from the extended state to the retracted state, the movable plate 41 moves forward to drive the protective cover 2 to move forward, until the locking piece 24 is inserted into the locking groove 121, and the protective cover 2 is forced to rotate downward around the rotating shaft 411 and fit into the fixed knife 11, completing the locking of the protective cover 2 in the extended state; when it is necessary to switch the protective cover 2 from the extended state to the retracted state, the movable plate 41 moves forward to drive the protective cover 2 to move forward, The movable plate 41 moves backward, driving the protective cover 2 to move successively, that is, the locking piece 24 moves backward relative to the locking groove 121. After moving a short distance (there is a certain distance between the front end of the protective cover 2 and the front end of the movable knife 3. When the protective cover 2 moves backward a short distance, it will not touch the movable knife 3), the locking piece 24 disengages from the locking groove 121. At this time, the protective cover 2 rotates upward around the rotating shaft 411 under the action of external force, and then the movable plate 41 continues to drive the protective cover 2 to move backward to the retracted state; the fixed knife holder 12 is a plastic part, and the locking groove 121 has a certain anti-deformation strength so that the locking piece 24 can enter and exit the locking groove 121.

[0044] In this embodiment, a locking piece 24 and a locking groove 121 are provided to cooperate with each other, so that the protective cover 2 can be locked in the extended state to limit the rotation of the protective cover 2, ensuring that the protective cover 2 can prevent the movable blade 3 from contacting the skin during vertical shearing, thereby improving safety.

[0045] Optionally, combined Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 As shown, the fixed knife holder 12 is connected with an adjusting wheel 6, a gear 7 and a retaining spring 8. The adjusting wheel 6 is provided with a pin shaft 61 for installing the gear 7 so that the gear 7 can be driven to rotate when the adjusting wheel 6 rotates. The retaining spring 8 is connected to the pin shaft 61 to limit the position of the gear 7 in the up and down directions. The movable plate 41 is provided with a rack 412 that is transmission-connected to the gear 7.

[0046] Among them, a limit is provided 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 retaining spring 8 is fixedly connected to the fixed knife holder 12, and the other end is clamped with the top end of the pin shaft 61 to limit the position of the gear 7 in the up and down directions, ensuring stable transmission between the gear 7 and the rack 412; the adjusting wheel 6 is located outside the fixed knife holder 12, and when the user rotates the adjusting wheel 6, the gear 7 engages with the rack 412 for transmission, so that the movable plate 41 can move in the front and back directions.

[0047] Optionally, combined Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 As shown, the adjusting wheel 6 is provided with an arc-shaped positioning tooth 62 and an arc-shaped limiting groove 63 , and the fixed tool holder 12 is provided with a movable positioning pin 122 cooperating with the arc-shaped positioning tooth 62 and a limiting protrusion 123 cooperating with the arc-shaped limiting groove 63 .

[0048] Among them, the movable positioning pin 122 has a certain elasticity in the up and down directions, and the arc-shaped positioning tooth 62 has a plurality of adjacent grooves that abut 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 various positions; the arc-shaped limiting groove 63 cooperates with the limiting protrusion 123, so that the adjusting wheel 6 can be limited at the extreme position to prevent excessive rotation, that is, to ensure that the extreme positions of the movement of the protective cover 2 are the extended state and the retracted state, which can facilitate the user to determine the positions of the two states.

[0049] Another embodiment of the present invention provides a hair trimmer including the above-mentioned cutter head structure with a movable protective cover.

[0050] The hair trimmer of the present invention has a protective cover 2 and a driving assembly 4 that can drive the protective cover 2 to move directly on the cutter head, so that the cutter head structure can adapt to the blades of various hair trimmers, with high flexibility and strong versatility; the driving assembly 4 drives the protective cover 2 to switch between the extended state and the retracted state, and can ensure that the protective cover 2 does not interfere with the reciprocating operation of the movable knife 3 to cut hair in the two states, so that the protective cover 2 can prevent the movable knife 3 from directly contacting the skin when the movable knife 3 is in the extended state, thereby avoiding the situation that the movable knife 3 scratches the skin when cutting vertically, improving the safety of use, and realizing that in the retracted state, the comb teeth of the movable knife 3 and the fixed knife 11 are exposed, and the comb teeth can pre-lift soft hair and other hair during normal haircutting so that the hair can smoothly enter the position of the movable knife 3, making it convenient for the movable knife 3 to trim the hair, ensuring that the hair is trimmed cleanly and the shaving effect is good.

[0051] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A cutter head structure with a movable protective cover, characterized in that: The invention comprises a fixed knife assembly (1), a protective cover (2) and a movable knife (3) capable of reciprocating relative to the fixed knife assembly (1); a driving assembly (4) is provided between the protective cover (2) and the fixed knife assembly (1); the driving assembly (4) is used to drive the protective cover (2) to move relative to the fixed knife assembly (1) so as to switch the protective cover (2) between an extended state and a retracted state; when in the extended state, an inner space (1) for the movable knife (3) to reciprocate is formed between the protective cover (2) and the fixed knife assembly (1). 5), when in the retracted state, the movable knife (3) is exposed; the fixed knife assembly (1) includes a fixed knife (11) and a fixed knife holder (12) connected to each other, the driving assembly (4) includes a movable plate (41) connected to the fixed knife assembly (1) in a sliding manner in the front-back direction, the movable plate (41) is connected to the protective cover (2) to drive the protective cover (2) to move so as to realize the switching of the protective cover (2) between the extended state and the retracted state; the left and right sides of the movable plate (41) are provided with a rotating shaft (411), the protective cover (2) is provided with a rotating shaft (411), and the protective cover (2) is provided with a rotating shaft (411). The protective cover (2) comprises a comb tooth portion (21) and extension arms (22) extending backward from the left and right ends of the rear side of the comb tooth portion (21); the extension arm (22) is provided with an axis hole (23) cooperating with the rotating shaft (411) to realize the mutual hinged connection between the protective cover (2) and the movable plate (41); the rotating shaft (411) is outer-mounted with a torsion spring (42), and the two ends of the torsion spring (42) are respectively in contact with the extension arm (22) and the movable plate (41); the extension arm (22) is provided with a locking piece (24), and the fixed knife The frame (12) is provided with a locking groove (121) that cooperates with the locking piece (24); the fixed knife frame (12) is connected with an adjusting wheel (6), a gear (7) and a retaining spring (8); the adjusting wheel (6) is provided with a pin shaft (61) for mounting the gear (7) so as to drive the gear (7) to rotate when the adjusting wheel (6) rotates; the retaining spring (8) is connected with the pin shaft (61) to limit the position of the gear (7) in the vertical direction; and the movable plate (41) is provided with a rack (412) that is transmission-connected to the gear (7).

2. The cutter head structure with a movable protective cover according to claim 1, characterized in that: The driving assembly (4) further comprises a limit plate (43) connected to the movable plate (41), and a pressure plate (431) cooperating with the extension arm (22) is respectively provided on the left and right sides of the limit plate (43) to limit the maximum rotation angle of the protective cover (2).

3. The cutter head structure with a movable protective cover according to claim 2, characterized in that: The limiting plate (43) is further provided with a pressure spring piece (432) and a blocking piece (433), wherein the pressure spring piece (432) abuts against the fixed knife (11), and the blocking piece (433) is vertically connected to the outer side of the pressure plate (431) and abuts against the outer side surface of the extension arm (22).

4. The cutter head structure with a movable protective cover according to claim 1, characterized in that: The regulating wheel (6) is provided with an arc-shaped positioning tooth (62) and an arc-shaped limiting groove (63), and the fixed knife holder (12) is provided with a movable positioning pin (122) matched with the arc-shaped positioning tooth (62) and a limiting protrusion (123) matched with the arc-shaped limiting groove (63).

5. A hair trimmer, characterized in that: A cutter head structure with a movable protective cover as described in any one of claims 1 to 4.

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