Self-clamping hair trimming head

Abstract

The present invention relates to a self-locking hair trimming head, characterized in that it is further provided with a snap-fastener, the snap-fastener comprising at least one elastic snap-fastener sheet and at least two clips, the clips being respectively connected to a stationary blade so that the snap-fastener sheet snaps onto a movable blade, keeping the end face of the movable blade always in contact with the end face of the stationary blade, and the movable blade can swing back and forth along the end face of the stationary blade under the action of an external force, so that the cutting teeth provided in the stationary blade and the movable blade cooperate with each other to cut hair. The beneficial effect of the present invention is that the clips and the snap-fastener sheet of the snap-fastener are respectively snapped onto the outer surfaces of the stationary blade and the movable blade that are separated from each other, forming a self-locking lock, thereby preventing the movable blade from separating from the stationary blade and ensuring that the end faces of the stationary blade and the movable blade always remain in contact with each other, thereby avoiding the occurrence of blade jumping during the hair trimming process. Secondly, by replacing the double torsion spring with the snap-fastener, the head is not restricted by the size of the stationary blade or the movable blade, and can be correspondingly reduced or expanded according to the size changes of the stationary blade or the movable blade, thereby meeting the assembly and use requirements of the trimming head.

Description

Technical Field

[0001] The present invention relates to a hair trimming device, and more particularly to a self-locking hair trimming head, which is mainly used in the field of hair trimming tools. Background Art

[0002] The reciprocating trimming head mainly includes a stationary blade and a movable blade. The movable blade is fitted with the end face of the stationary blade. The movable blade holder is connected to the movable blade and is driven by the driving mechanism to make the movable blade swing back and forth along the end face of the stationary blade to trim the hair. It is the main component of a razor, sideburn razor, eyebrow trimmer, hair shaver or barber scissors.

[0003] To ensure effective hair trimming, the movable blade of existing trimming heads generally relies on the torsion arm of a double torsion spring to press against the movable blade or the movable blade holder to ensure that the movable blade always maintains end-face contact with the static blade. However, to facilitate the installation and fixation of the double torsion spring, the trimming head must be large enough to meet the use requirements of the trimming head. However, it is not applicable to eyebrow trimmers, sideburn trimmers, or razor blades with smaller size requirements. Although the installation requirements can be met by reducing the size of the double torsion spring, the pressure of the torsion arm of the double torsion spring will be reduced accordingly, which will cause the movable blade to jump during use, resulting in hair pulling or ripping on the trimming head, reducing the comfort of use of the trimming head. Summary of the Invention

[0004] To address the above technical problems, the present invention provides a self-locking hair trimming head that, without the aid of dual torsion springs, maintains constant end-face contact between the moving and stationary blades. This prevents blade jumping, hair pulling, and hair ripping, improving user comfort. Furthermore, the head can be reduced in size and applied to smaller eyebrow trimmers, sideburn trimmers, or razor blades, meeting the installation and usage requirements of these blades.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is a self-locking hair trimming head, which includes a stationary blade and a movable blade, and is also provided with a spring-loaded member. The spring-loaded member includes at least one elastic spring-loaded member and at least two clamping feet. The clamping feet are respectively connected to the stationary blade so that the spring-loaded member is pressed against the movable blade to keep the end face of the movable blade always in contact with the end face of the stationary blade. In addition, the movable blade can swing back and forth along the end face of the stationary blade under the action of an external force, so that the cutting teeth provided in the stationary blade and the movable blade cooperate with each other to cut hair.

[0006] Preferably, the spring fastener comprises a body, two clamping feet are provided, one end of each of which is connected to the body as a whole, and two spring fastener pieces are provided at two ends of the body opposite to each other and are an integral structure with the body.

[0007] Preferably, a through hole is provided in the center of the stationary knife, and a penetrating swing hole is provided on the movable knife. The size of the swing hole is larger than the through hole and its width is larger than the reciprocating swing distance of the movable knife; the clamping foot passes through the swing hole and the through hole respectively and is hooked and connected to the outer surface of the stationary knife; the spring clips are respectively pressed on the outer surface of the movable knife so that the end faces of the stationary knife and the movable knife always remain in contact.

[0008] Preferably, a guide mechanism is provided between the stationary knife and the movable knife, and under the restriction of the guide mechanism, the movable knife can only swing back and forth along the length direction of the stationary knife.

[0009] Preferably, a sliding groove is provided on the movable knife, and one end of the spring clip pressed on the movable knife is placed in the sliding groove so that the end surface of the movable knife and the end surface of the stationary knife always keep in contact.

[0010] Preferably, a rolling element is provided between the spring catch piece and the movable knife, and the spring catch piece is pressed on the rolling element and contacts the rolling element so that the end face of the movable knife and the end face of the stationary knife always keep in contact.

[0011] Preferably, an arcuate groove matching the outer diameter of the rolling element is provided at the contact point between the spring catch and the rolling element. The rolling element is a ball or a needle, and the ball or needle is partially placed in the arcuate groove.

[0012] Preferably, the movable knife includes a movable blade and a movable knife seat, the movable blade and the movable knife seat are synchronously linked, the swing hole passes through the movable knife seat and the movable blade respectively, the clamping foot passes through the swing holes on the movable knife seat and the movable blade and the through hole in the static knife and is hooked and connected to the outer surface of the static knife, the spring clip is buckled on the movable knife seat so that the movable blade and the end face of the static knife always remain in contact, and under the action of external force, the movable knife seat can drive the movable blade to swing back and forth along the end face of the static knife, so that the cutting teeth provided on the movable blade and the cutting teeth on the static knife cooperate with each other to cut off the hair.

[0013] Preferably, the guide mechanism includes at least one guide column arranged on the movable knife seat, and a linkage hole and a guide hole arranged at corresponding positions of the movable knife and the stationary knife. The shape of the linkage hole matches the guide column. One end of the guide column passes through the linkage hole to synchronize the movable blade with the movable knife seat, and the end of the guide column is inserted into the guide hole.

[0014] Preferably, the sliding groove is provided on the outer surface of the movable knife seat, and a rolling groove is provided at the bottom of the sliding groove. The rolling element is placed in the rolling groove and its part is placed in the sliding groove to fit with the arc groove on the spring clip.

[0015] The present invention has the beneficial effect of utilizing the latching foot and latching piece of the spring fastener to respectively latch onto the opposing outer surfaces of the stationary and movable blades, forming a self-locking pattern. This prevents the movable blade from separating from the stationary blade while also ensuring that the end faces of the stationary and movable blades remain in contact with each other, thus preventing blade jumping during the trimming process and improving the operating stability and trimming performance of the trimming head. Furthermore, by replacing the double torsion spring with a spring fastener, the spring fastener is not restricted by the size of the stationary or movable blade and can be reduced or expanded accordingly to meet the assembly and use requirements of the trimming head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional structural diagram of a self-locking hair trimming head according to an embodiment of the present invention

[0017] Figure 2 This is a cross-sectional structural diagram of the self-locking hair trimming head according to an embodiment of the present invention.

[0018] Figure 3 Schematic diagram of the explosion of the self-locking hair trimming head according to the embodiment of the present invention

[0019] Figure 4 A three-dimensional structural diagram of a self-locking hair trimming head with a ball bearing installed in accordance with an embodiment of the present invention

[0020] Figure 5 A cross-sectional structural diagram of a self-locking hair trimming head with a ball bearing installed according to an embodiment of the present invention

[0021] Figure 6 This is a top-view three-dimensional structural diagram of the movable knife in an embodiment of the present invention

[0022] Figure 7 This is a bottom perspective structural diagram of the movable knife in an embodiment of the present invention

[0023] Figure 8 Schematic diagram of an exploded view of a self-locking hair trimming head with a ball bearing installed in an embodiment of the present invention

[0024] Figure 9 This is the second embodiment of the rolling groove in the movable knife in the embodiment of the present invention

[0025] Figure 10 This is a cross-sectional assembly diagram of the second embodiment of the rolling groove in the embodiment of the present invention

[0026] Figure 11 A three-dimensional structural diagram of a self-tightening hair trimming head with a needle roller installed in an embodiment of the present invention

[0027] Figure 12 A cross-sectional structural diagram of a self-tightening hair trimming head with a needle roller installed in an embodiment of the present invention

[0028] Figure 13Schematic diagram of an exploded view of a self-locking hair trimming head with a needle roller installed in an embodiment of the present invention DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-13 The embodiments of the present invention are further described as follows:

[0030] The size of the existing trimming heads used in eyebrow trimmers and sideburn trimmers is smaller than that of trimming heads used in hair clippers or razors. If a trimming head with the same structure as a hair clipper or razor is used, a double torsion spring is used to drive the movable blade 2 to fit the end face of the stationary blade 1. Due to size limitations, the size of the double torsion spring also needs to be reduced accordingly. This will result in insufficient pressure on the torsion arm of the double torsion spring, causing the trimming head to easily jump during the hair trimming process, thereby affecting the hair trimming performance of the trimming head. To this end, the present invention provides a self-locking hair trimming head, comprising a stationary blade 1, a movable blade 2, and a snap-fastener 3. The snap-fastener 3 includes at least one elastic snap-fastener sheet 31 and at least two clamping feet 32. The clamping feet 32 ​​are respectively connected to the stationary blade 1 so that the snap-fastener sheet 31 is pressed against the movable blade 2 to keep the end face of the movable blade 2 always in contact with the end face of the stationary blade 1. The latching foot 32 and the latching piece 31 of the latching member 3 are respectively pressed against the outer surfaces of the static blade 1 and the movable blade 2 that are separated from each other, forming a self-locking lock. This prevents the movable blade 2 from separating from the static blade 1 while ensuring that the end faces of the static blade 1 and the movable blade 2 always remain in contact, avoiding the occurrence of blade jumping during the hair trimming process, thereby improving the working stability and hair trimming performance of the pruning head. Secondly, replacing the double torsion spring with the latching member 3 eliminates the size restrictions of the static blade 1 or the movable blade 2 and can be reduced or expanded accordingly according to the size changes of the static blade 1 or the movable blade 2, meeting the assembly and use requirements of the pruning head. To facilitate hair trimming, the movable blade 2 is linked to the output shaft of the motor installed in the body. After the motor is started, the output shaft can drive the movable blade 2 to swing back and forth along the end face of the static blade 1, and the cutting teeth provided on the static blade 1 and the movable blade 2 can cooperate with each other to cut hair. In the actual production process, in order to reduce the friction resistance between the movable blade 2 and the stationary blade 1 and reduce the temperature rise of the pruning head, the movable blade 2 and the stationary blade 1 are bent and formed separately to form an air flow channel between the movable blade 2 and the stationary blade 1, thereby reducing the contact area between the movable blade 2 and the stationary blade 1. While reducing the friction resistance and lowering the temperature rise, it can also speed up the entry of external air into the air flow channel to accelerate heat dissipation.

[0031] To facilitate the spring-loaded latch 3 in driving the movable blade 2 to engage the end faces of the stationary blade 1, forming a self-locking connection, the spring-loaded latch 3 includes a body 33, two latching feet 32, one end of each of which is integrally connected to the body 33, and two latching plates 31, disposed opposite each other at opposite ends of the body 33 and integrally formed with the body 33. The provision of two latching feet 32 ​​allows them to be hooked and connected to the stationary blade 1 during assembly. The hooking connection can be located at either or both edges of the stationary blade 1. While welding can also be used to secure the latching feet 32 ​​to the stationary blade 1, the hooking method is easier to assemble, and therefore, this embodiment is the preferred embodiment. After the clamping foot 32 is hooked and connected with the stationary knife 1, the two spring clips 31 provided at both ends of the main body 33 are pressed onto the movable knife 2. The elastic force of the spring clips 31 can not only keep the end faces of the movable knife 2 and the stationary knife 1 always in contact; at the same time, the clamping foot 32, in cooperation with the spring clips 31, can make the stationary knife 1 and the movable knife 2 form a self-locking, preventing the movable knife 2 from separating from the stationary knife 1 and forming a whole, which is convenient for overall assembly and disassembly.

[0032] Because several cutting teeth are located at the front end of the stationary blade 1, to prevent the latching foot 32 from interfering with the hair trimming performance of the cutting teeth, a through-hole 11 is provided in the center of the stationary blade 1, and a swinging hole 211 is provided through the movable blade 2. The swinging hole 211 is larger than the through-hole 11 and its width is greater than the reciprocating swing distance of the movable blade 2. The latching foot 32 passes through the swinging hole 211 and the through-hole 11, respectively, to hook and connect with the outer surface of the stationary blade 1. The spring clip 31 is respectively pressed against the outer surface of the movable blade 2, so that the end surfaces of the stationary blade 1 and the movable blade 2 are always in contact. By providing the through-hole 11 in the stationary blade 1 and the latching foot 32 passing through the through-hole 11 to hook and connect with the outer surface of the stationary blade 1, the cutting teeth on the stationary blade 1 are avoided, ensuring that the end surfaces of the movable blade 2 and the stationary blade 1 are in contact and self-locking contact, while also preventing the latching foot 32 from interfering with the cutting teeth. By setting the width of the swing hole 211 on the movable blade 2 to be larger than the through hole 11, when the movable blade 2 swings back and forth driven by the motor output shaft, the two sides of the swing hole 211 will not contact the clamping feet 32 ​​of the spring fastener 3, thereby improving the working stability of the pruning head.

[0033] In the above embodiment, the stationary blade 1 and the movable blade 2 rely on the spring fastener 3 to achieve self-locking. Although the spring fastener 3 can prevent the movable blade 2 from detaching from the stationary blade 1, it does not have a limiting function. For example, when the movable blade 2 swings back and forth along the stationary blade 1 under the drive of an external force, there may be a swing deviation or misalignment, thereby affecting the hair trimming performance of the pruning head. For this reason, a guide mechanism 4 is provided between the stationary blade 1 and the movable blade 2. Under the restriction of the guide mechanism 4, the movable blade 2 can only swing back and forth along the length direction of the stationary blade 1. Utilizing the guide mechanism 4, when the movable blade 2 swings back and forth along the end face of the stationary blade 1 under the drive of an external force, the guide mechanism 4 can effectively prevent the movable blade 2 from deviating or misaligning relative to the stationary blade 1, thereby improving the hair trimming performance and trimming efficiency of the pruning head.

[0034] During the hair trimming process, the movable blade 2 needs to swing back and forth along the end face of the stationary blade 1 under the action of external force, and the spring catch 31 is pressed on the outer surface of the movable blade 2. In order to prevent the spring catch 31 from being displaced or deflected when the movable blade 2 swings back and forth under the external force, thereby causing the clamping foot 32 of the spring catch 3 to loosen from the stationary blade 1, a sliding groove 212 is provided on the movable blade 2. The end of the spring catch 31 that is pressed on the movable blade 2 is placed in the sliding groove 212 so that the end face of the movable blade 2 and the end face of the stationary blade 1 are always kept in contact with each other. The sliding groove 212 can limit the spring catch 31, which can effectively prevent the spring catch 31 from being deflected along the swinging direction of the movable blade 2, thereby ensuring the installation firmness of the spring catch 3, improving the working stability of the pruning head, and ensuring the hair trimming performance.

[0035] In the above embodiment, the movable blade 2 relies on the snap-action piece 31 to maintain contact with the end surface of the stationary blade 1. When the movable blade 2 swings along the end surface of the stationary blade 1 under external force, the snap-action piece 31 also moves relative to the outer surface of the movable blade 2. To reduce frictional resistance between the snap-action piece 31 and the outer surface of the movable blade 2 during swinging, a rolling element 5 is provided between the snap-action piece 31 and the movable blade 2. The snap-action piece 31 snaps onto the rolling element 5, causing it to contact the rolling element 5, which in turn presses against the movable blade 2, maintaining contact between the end surfaces of the movable blade 2 and the stationary blade 1. The addition of the rolling element 5 and the spring catch 31 not only allows the rolling element 5 to press the movable blade 2, ensuring that the end faces of the movable blade 2 and the stationary blade 1 are always in contact, but also, as the movable blade 2 reciprocates along the stationary blade 1, the rolling element 5 also rolls accordingly under the pressure of the spring catch 31. This effectively reduces the frictional resistance between the spring catch 31 and the movable blade 2, ensuring hair trimming performance while also reducing the temperature rise between the movable blade 2 and the stationary blade 1, thereby improving the user comfort of the trimming head. Furthermore, it also reduces the driving kinetic energy required during the swinging of the movable blade 2, thereby extending the battery life and service life.

[0036] To prevent the rolling element 5 from disengaging from the snap plate 31 as it rolls following the reciprocating swing of the movable blade 2, an arcuate groove 311 matching the outer diameter of the rolling element 5 is provided at the contact point between the snap plate 31 and the rolling element 5. The rolling element 5 is a ball or needle roller, and the ball or needle roller is partially positioned within the arcuate groove 311. The arcuate groove 311, whose cross-section matches the outer diameter of the ball or needle roller, is provided on the snap plate 31. When the snap plate 31 is pressed against the outer surface of the ball or needle roller, the ball or needle roller not only presses against the movable blade 2, ensuring that the end face of the movable blade 2 always adheres to the end face of the stationary blade 1, thereby ensuring the hair trimming performance of the trimming head, but also the arcuate groove 311 restricts the rolling of the ball or needle roller, effectively preventing it from disengaging from the snap plate 31, thereby ensuring the hair trimming performance and operational stability of the trimming head.

[0037] To facilitate driving the movable blade 2 to reciprocate along the stationary blade 1 for hair trimming, the movable blade 2 includes a movable blade 21 and a movable blade holder 22. The movable blade 21 and the movable blade holder 22 are synchronously linked. A drive slot 221 is provided in the movable blade holder 22. The output shaft of the motor is positioned within the drive slot 221 to drive the movable blade holder 22 for reciprocal movement. Because the movable blade 21 and the movable blade holder 22 are synchronously linked, the movable blade 21, driven by the movable blade holder 22, can synchronously reciprocate along the end surface of the stationary blade 1 for hair trimming. In order to prevent the installation of the spring catch 3 from interfering with the cutting teeth of the static knife 1 and the movable knife 2 in trimming hair, the swing hole 211 passes through the movable knife seat 22 and the movable blade 21 respectively, and the clamping foot 32 passes through the swing holes 211 on the movable knife seat 22 and the movable blade 21 and the through hole 11 in the static knife 1 and is hooked and connected with the outer surface of the static knife 1. The spring catch piece 31 is pressed on the movable knife seat 22 so that the movable blade 21 and the end face of the static knife 1 are always kept in contact. Under the action of external force, the movable knife seat 22 can drive the movable blade 21 to swing back and forth along the end face of the static knife 1, so that the cutting teeth provided on the movable blade 21 cooperate with the cutting teeth on the static knife 1 to cut hair.

[0038] When the movable blade holder 22 drives the movable blade 21 to swing back and forth along the stationary blade 1, in order to prevent the movable blade 2 and the stationary blade 1 from being misaligned or deviated from each other, thereby affecting the hair trimming performance of the cutting teeth, the guide mechanism 4 includes at least one guide post 41 provided on the movable blade holder 22, and linkage holes 42 and guide holes 43 provided at corresponding positions of the movable blade 2 and the stationary blade 1. The shape of the linkage hole 42 matches that of the guide post 41. One end of the guide post 41 passes through the linkage hole 42 to synchronize the movable blade 21 with the movable blade holder 22, and the end of the guide post 41 is inserted into the guide hole 43. The guide post 41 is provided on the movable blade holder 22, and the linkage hole 42 is provided on the movable blade 21. During assembly, the guide post 41 passes through the linkage hole 42, thereby enabling the movable blade 21 to synchronize with the movable blade holder 22. When the guide post 41 is inserted into the guide hole 43 on the stationary blade 1, the guide hole 43 restricts the swinging direction of the movable blade 21, effectively preventing the movable blade 21 from being misaligned or deviated when it swings back and forth along the stationary blade 1 driven by the movable blade holder 22, thereby ensuring the hair trimming performance of the stationary blade 1 and the movable blade 21 and the working stability of the trimming head.

[0039] The sliding groove 212 provided on the movable blade 2 is formed on the outer surface of the movable blade holder 22. Although the sliding groove 212 can restrain the spring catch 31, the presence of a ball or needle roller between the spring catch 31 and the movable blade holder 22 makes it very easy for the ball or needle roller to slip out of the spring catch 31 and the movable blade holder 22 when the movable blade 21 is driven by the movable blade holder 22 to reciprocate along the stationary blade 1, affecting the end-face contact between the movable blade 21 and the stationary blade 1 and even the hair trimming performance. To this end, a rolling groove 213 is provided at the bottom of the sliding groove 212 of the movable blade holder 22. The ball or needle roller of the rolling element 5 is positioned within the rolling groove 213. The length of the rolling groove 213 can be greater than or equal to the diameter of the ball or needle roller. In this way, when the spring catch 31 is pressed against the ball or needle roller, a portion of the outer surface of the ball or needle roller is positioned within the arcuate groove 311 in the spring catch 31. In actual production, only one of the arc-shaped groove 311 on the spring catch 31 and the rolling groove 213 in the movable knife seat 22 can be selected, or both can be selected at the same time, which can be determined according to user requirements.

[0040] The above embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A self-locking hair trimming scissor head, comprising a stationary blade (1) and a movable blade (2); characterized in that A snap fastener (3) is also provided, the snap fastener (3) comprising at least one elastic snap fastener sheet (31) and at least two clamping feet (32), the clamping feet (32) being respectively connected to the stationary knife (1) so that the snap fastener sheet (31) is clamped on the movable knife (2) so that the end face of the movable knife (2) is always kept in contact with the end face of the stationary knife (1), and the movable knife (2) can swing back and forth along the end face of the stationary knife (1) under the action of an external force, so that the cutting teeth arranged in the stationary knife (1) and the movable knife (2) cooperate with each other to cut hair.

2. The self-clamping hair trimming head according to claim 1, characterized in that The spring catch (3) comprises a body (33), a clamping foot (32) having two ends respectively connected to the body (33) as a whole, and a spring catch piece (31) having two pieces arranged at the two ends of the body (33) opposite to each other and forming an integral structure with the body (33).

3. The self-clamping hair trimming head according to claim 1, characterized in that A through hole (11) is provided at the center of the stationary knife (1), and a penetrating swing hole (211) is provided on the movable knife (2). The size of the swing hole (211) is larger than the through hole (11) and its width is larger than the reciprocating swing distance of the movable knife (2). The clamping foot (32) passes through the swing hole (211) and the through hole (11) respectively and is hooked and connected with the outer surface of the stationary knife (1). The spring clip (31) is respectively pressed on the outer surface of the movable knife (2) so that the end faces of the stationary knife (1) and the movable knife (2) are always kept in contact.

4. The self-clamping hair trimming head according to claim 1, characterized in that A guide mechanism (4) is provided between the stationary knife (1) and the movable knife (2). Under the restriction of the guide mechanism (4), the movable knife (2) can only swing back and forth along the length direction of the stationary knife (1).

5. The self-clamping hair trimming head according to claim 1, characterized in that A sliding groove (212) is provided on the movable knife (2), and one end of the spring clip (31) pressed on the movable knife (2) is placed in the sliding groove (212) so that the end surface of the movable knife (2) and the end surface of the stationary knife (1) always keep in contact.

6. The self-clamping hair trimming head according to claim 1, characterized in that A rolling element (5) is provided between the spring catch piece (31) and the movable knife (2), and the spring catch piece (31) is pressed on the rolling element (5) and contacts the rolling element (5) so that the end surface of the movable knife (2) and the end surface of the stationary knife (1) always remain in contact.

7. The self-clamping hair trimming head according to claim 6, characterized in that An arcuate groove (311) matching the outer diameter of the rolling element (5) is provided at the contact point between the spring catch (31) and the rolling element (5); the rolling element (5) is a ball or a needle, and the ball or needle is partially placed in the arcuate groove (311).

8. The self-clipping hair trimming head according to any one of claims 1 to 7, characterized in that The movable knife (2) comprises a movable blade (21) and a movable blade seat (22). The movable blade (21) and the movable blade seat (22) are synchronously linked. The swing hole (211) passes through the movable blade seat (22) and the movable blade (21) respectively. The clamping foot (32) passes through the swing holes (211) on the movable blade seat (22) and the movable blade (21) and the through hole (11) in the static knife (1) and is hooked and connected with the outer surface of the static knife (1). The spring catch (31) is buckled on the movable blade seat (22) so that the movable blade (21) and the end face of the static knife (1) always keep in contact. Under the action of external force, the movable blade seat (22) can drive the movable blade (21) to swing back and forth along the end face of the static knife (1), so that the cutting teeth arranged on the movable blade (21) and the cutting teeth on the static knife (1) cooperate with each other to cut hair.

9. The self-clamping hair trimming head according to claim 8, characterized in that The guide mechanism (4) comprises at least one guide column (41) arranged on the movable blade seat (22), and a linkage hole (42) and a guide hole (43) arranged at corresponding positions of the movable blade (2) and the stationary blade (1). The shape of the linkage hole (42) matches that of the guide column (41). One end of the guide column (41) passes through the linkage hole (42) to synchronize the movable blade (21) and the movable blade seat (22), and the end of the guide column (41) is inserted into the guide hole (43).

10. The self-clamping hair trimming head according to claim 8, characterized in that A sliding groove (212) is provided on the outer surface of the movable knife seat (22); a rolling groove (213) is provided at the bottom of the sliding groove (212); a rolling element (5) is placed in the rolling groove (213); a part of the rolling element (5) is placed in the sliding groove (212) and fits in the arc groove (311) on the spring catch (31).

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