Hair trimmer head

Abstract

A hair trimmer head includes: a stationary blade assembly having a central cutting region and side cutting regions on both sides; a second moving blade configured to reciprocate relative to the side cutting regions of the stationary blade assembly along a first direction; and a first moving blade assembly configured to reciprocate relative to the central cutting region of the stationary blade assembly along a second direction; wherein the first direction is opposite to the second direction. The opposing movements of the two second moving blades in the central and side cutting regions are utilized. When the second and first moving blades have similar masses and opposite directions of movement, their inertial forces can cancel each other out, thereby reducing the overall vibration of the trimmer head, improving stability during handheld use, reducing noise, and extending the service life of the drive unit and the trimmer head.

Description

Technical Field

[0001] This invention relates to the field of skin cleansing technology, specifically to a hair trimmer tip. Background Technology

[0002] Hair trimmer heads, especially those used in women's shavers, typically employ a hair cutting component as disclosed in Chinese patent CN120663364A. This component uses two sets of second moving blades, one of which cuts with a central blade mesh, while the other cuts with side stationary blades on either side. Because it is driven by the same power source, it can only achieve unidirectional movement between the two second moving blades and their corresponding blade mesh or side stationary blades. Due to the high-speed reciprocating motion of the two second moving blades in the same direction, their acceleration directions are the same, and the peak inertial forces are superimposed at the same moment. This requires the drive motor to output a larger instantaneous force, which in turn increases the motor current, leading to increased noise and vibration. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a hair trimming scissor head.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A hair trimmer head, comprising: A stationary blade assembly includes a stationary blade holder and a first stationary blade and a second stationary blade fixed thereon. The first and second stationary blades cooperate with the stationary blade holder, forming an installation space within the stationary blade holder. The stationary blade assembly has a central shearing region formed by the first stationary blade and side shearing regions located on one or both sides of the central shearing region. The second moving blade is configured to reciprocate relative to the second stationary blade in the side shearing region along the first direction; The first moving blade assembly is configured to reciprocate relative to the first stationary blade in the second direction in the intermediate shearing region; A linkage mechanism is disposed within the installation space, connecting the second moving blade and the first moving blade assembly, such that the first and second directions of their movement are opposite.

[0005] The first moving blade assembly includes a moving blade holder and a first moving blade that can be floated on the moving blade holder, and an elastic member for supporting the first moving blade is provided between the first moving blade and the moving blade holder.

[0006] The second moving cutter includes a side cutter located on one or both sides and a drive unit for driving the second moving cutter to reciprocate.

[0007] The first moving blade assembly and the second moving blade are stacked in the installation space along a direction perpendicular to the reciprocating motion, and the bottom of the first moving blade assembly is in contact with or slides with the upper surface of the second moving blade.

[0008] The first moving blade assembly is disposed within the mounting space, and the second moving blade is located outside the mounting space and slides in cooperation with the second stationary blade; along the direction perpendicular to the reciprocating motion, the first moving blade assembly and the second moving blade are respectively located on the upper and lower sides of the second stationary blade.

[0009] The linkage mechanism is disposed between the first moving blade assembly and the second moving blade or the second stationary blade, and the swing plane of the linkage mechanism is parallel to the reciprocating motion plane of the second moving blade.

[0010] The bottom of the first moving blade assembly is provided with a first clearance space for accommodating the linkage mechanism. The thickness of the first clearance space matches the thickness of the linkage mechanism, so that the linkage mechanism can swing freely within the first clearance space.

[0011] The linkage mechanism includes at least one link, the middle of which is pivotally connected to the stationary tool holder in the second stationary tool or stationary tool assembly, one end of which is connected to the second moving tool, and the other end of which is connected to the moving tool holder.

[0012] The linkage mechanism includes two links, which are respectively located at both ends of the reciprocating motion direction of the second moving cutter.

[0013] The linkage mechanism includes two links, which are respectively disposed on both sides of the first moving blade assembly, and the swing plane of the two links is perpendicular to the reciprocating motion plane of the second moving blade.

[0014] The middle of each link is pivotally connected to the stationary tool holder of the stationary tool assembly, one end of each link is connected to the second moving tool, and the other end is connected to the moving tool holder on which the first moving tool is mounted.

[0015] The two connecting rods form a symmetrical connecting rod pair between the second moving cutter and the moving cutter holder, and the projection of the connecting rod pair in the reciprocating motion direction of the second moving cutter at least partially overlaps with the projection of the first moving cutter.

[0016] The driving part of the second moving blade extends upward to form an ear for cooperating with the connecting rod.

[0017] The ear portion consists of two parts, arranged front and back along the first direction, and a limiting space for limiting the connecting rod is formed between two adjacent ear portions.

[0018] One end of the connecting rod extends to form a protrusion placed within the limiting space.

[0019] The drive unit of the second moving blade is provided with a second clearance space for avoiding the connecting rod.

[0020] The second stationary blade is provided with a through hole extending through its upper and lower sides. The linkage mechanism passes through the through hole to connect the first moving blade assembly and the second moving blade, allowing the linkage mechanism to swing freely within the through hole.

[0021] The connecting hole includes: A central through hole is provided for accommodating the pivot shaft of the linkage mechanism; At least one arc-shaped clearance groove is provided on the side of the central through hole, and the linkage shaft of the linkage mechanism passes through the arc-shaped clearance groove; The arc center of the arc-shaped clearance groove coincides with the axis of the central through hole, so that the linkage shaft swings synchronously with the linkage mechanism within the arc-shaped clearance groove.

[0022] The upper surface of the second stationary blade and the bottom of the first moving blade assembly together form a first clearance space. The linkage mechanism is disposed within the first clearance space and can swing freely within the first clearance space without interfering with the first moving blade assembly and the second stationary blade.

[0023] The height of the first clearance space is greater than the thickness of the linkage mechanism, and the swing trajectory of the linkage mechanism has a gap in the height direction of the first clearance space.

[0024] The first clearance space is connected to the space below the second stationary blade through the connecting hole, and the linkage mechanism passes through the connecting hole and engages with the second moving blade in a transmission cooperation.

[0025] The beneficial effects of this invention are: utilizing the opposing movements of two second moving blades in the intermediate shearing region and the side shearing region. When the second moving blade and the first moving blade have similar masses and move in opposite directions, their inertial forces can cancel each other out, thereby reducing the overall vibration of the blade head, improving the stability of handheld use, reducing noise, and extending the service life of the drive device and the blade head. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is an exploded view of Embodiment 1 of the present invention.

[0028] Figure 3 This is a schematic diagram of the cooperation between the intermediate cutter head and the second moving cutter in Embodiment 1 of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the second moving blade in Embodiment 1 of the present invention.

[0030] Figure 5 This is an exploded view of Embodiment 2 of the present invention.

[0031] Figure 6 This is a cross-sectional schematic diagram of Embodiment 2 of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure at the joint between the second moving blade and the second stationary blade in Embodiment 2 of the present invention.

[0033] Figure 8 This is a schematic diagram of the structure of the second moving blade in Embodiment 2 of the present invention.

[0034] Figure 9 This is an exploded view of Embodiment 3 of the present invention.

[0035] Figure 10 This is a cross-sectional view of Embodiment 3 of the present invention.

[0036] Figure 11 This is a schematic diagram and an enlarged schematic diagram of the cooperation between the intermediate cutting head and the second moving cutting head in Embodiment 3 of the present invention.

[0037] Figure 12 This is a cross-sectional schematic diagram of the movement direction of Embodiment 3 of the present invention (after hiding some parts).

[0038] Figure 13 This is a schematic diagram of the structure of the second stationary blade in Embodiment 3 of the present invention.

[0039] Figure 14 This is an exploded view of Embodiment 4 of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain a specific posture (as shown in the figure).

[0042] like Figure 1As shown, the present invention discloses a hair trimmer head, which includes a stationary blade assembly 100, a second moving blade 500, and a first moving blade 200. The stationary blade assembly 100 is functionally divided in space into a central cutting region 110 and side cutting regions 120 located on one or both sides of the central cutting region 110. If it is two sides, the side cutting regions 120 on both sides are preferably symmetrically arranged about the central cutting region 110.

[0043] The stationary blade assembly includes a stationary blade holder 101 and a second stationary blade 103 fixed thereon. To achieve the aforementioned dual-area shearing function, a mounting groove is formed in the central area of ​​the stationary blade holder 101, and a first stationary blade 102 is fixedly disposed within this groove. The area where the first stationary blade 102 is located constitutes the intermediate shearing area 110. Simultaneously, the second stationary blade 103 structurally surrounds the intermediate shearing area 110 and extends on both sides to form multiple side stationary blade teeth 104. The area where these side stationary blade teeth 104 are located constitutes the side shearing area 120. It should be noted that the second stationary blade 103 can be configured as follows: Figure 1 The tool holder shown is positioned below the stationary tool holder 101. However, in other embodiments not shown, it may also be positioned above the stationary tool holder 101 as needed; this change in position does not affect the core inventive concept of the present invention.

[0044] The stationary tool holder 101 serves as the support base for the entire tool head and has a hollow receiving cavity inside. The first stationary tool 102 is fixedly installed in the mounting groove on the upper part of the stationary tool holder 101, covering a portion of the upper opening of the receiving cavity. The second stationary tool 103 is fixed to the stationary tool holder 101 by a snap-fit ​​structure, covering the remaining upper opening and side opening of the receiving cavity. Specifically, the first stationary tool 102, the second stationary tool 103, and the stationary tool holder 101 cooperate with each other to form a relatively enclosed mounting space inside the stationary tool holder 101.

[0045] Specifically, after the first stationary tool 102 and the second stationary tool 103 are respectively installed on the stationary tool holder 101, they act like lids, covering most of the openings in the internal cavity of the stationary tool holder 101, leaving only necessary gaps (such as openings for the linkage mechanism to pass through or channels for the drive mechanism to enter). Therefore, the installation space is generally in a relatively closed state, with only very small functional openings in the lower or side parts.

[0046] The installation space is defined by the side wall of the stationary blade holder 101, the lower surface of the first stationary blade 102, and the upper or inner surface of the second stationary blade 103. The installation space has an opening only in its lower or side portion for the transmission mechanism to enter; the remaining portion is covered by the first and second stationary blades 102 and 103 to prevent trimmed hair debris from entering the installation space. The transmission components inside the installation space (such as the connecting rod 400, linkage hole 502, and the mating surface between the protrusion 410 and the limiting space 550) are effectively protected and less prone to blockage or wear by hair debris. Compared to an open structure, the blade of this invention maintains smooth transmission even after long-term use, significantly extending the maintenance cycle.

[0047] At the same time, this design allows the entire cutter head to be integrated into a single unit, making it easy to disassemble, replace, or clean.

[0048] The second moving blade 500 has a U-shaped or similar structure, including two side blades 510 located on both sides and a drive unit 520 connecting the two side blades 510. Each side blade 510 is provided with side blade teeth, which are used to cooperate one-to-one with the side stationary blade teeth 104 on the aforementioned second stationary blade 103 to form a lateral shearing pair. After assembly, the second moving blade 500 is located below the first moving blade 200 (within the first position). Figure 1 (The orientation shown is for reference only), and the drive unit 520 of the second moving blade 500 provides clearance for the movement of the first moving blade 200 and its associated components. The second moving blade 500 is configured to move relative to the side shearing region 120 of the stationary blade assembly 100 (i.e., relative to the side stationary blade teeth 104) along a first direction ( Figure 1 It reciprocates in the positive x-direction.

[0049] The first moving blade assembly includes a first moving blade 200 and a moving blade holder 300. The first moving blade 200 is independently disposed from the second moving blade 500 and is located at the intermediate shearing region 110 of the stationary blade assembly 100, specifically below the first stationary blade 102. The first moving blade 200 is provided with first moving blade teeth for cooperating with the first stationary blade 102 to form an intermediate shearing pair. To ensure good contact and shearing effect between the first moving blade 200 and the first stationary blade 102, the first moving blade 200 is fixedly mounted on a moving blade holder 300, and one or more elastic elements (such as coil springs, leaf springs, etc.) are provided between the first moving blade 200 and the moving blade holder 300 to provide a preload to press the first moving blade 200 against the first stationary blade 102. The first moving blade 200 is configured to move relative to the intermediate shearing region 110 of the stationary blade assembly 100 (i.e., relative to the first stationary blade 102) along a second direction ( Figure 1 It reciprocates in the negative x-direction.

[0050] The first direction and the second direction are set to be opposite. In other words, when the second moving blade 500 moves to the left relative to the stationary blade assembly 100 to perform lateral shearing, the first moving blade 200 moves to the right relative to the stationary blade assembly 100 to perform intermediate shearing; and vice versa.

[0051] For ease of installation, the first moving blade 200, the second stationary blade 103, and the stationary blade holder 101 are detachably and securely connected by a snap-fit ​​structure, while the second moving blade 500 is movably constrained between the moving blade holder 300 of the first moving blade 200 and the drive unit of the second stationary blade 103.

[0052] The stationary blade holder 101 serves as the base for the entire blade head, and its bottom (or sidewall) is integrally formed with several locking arms. Each locking arm has a hook at its end. Correspondingly, the second stationary blade 103 and the first moving blade 200 (or the moving blade holder 300 of the first moving blade 200) are respectively provided with slots or stepped surfaces that cooperate with the hooks.

[0053] First, fix the first stationary blade 102 into the mounting groove of the stationary blade holder 101 (this can be achieved through bonding, welding, or secondary injection molding). Then, place the first moving blade 200 on the moving blade holder 300, and place an elastic element (such as a spring) between them. Next, insert the assembled first moving blade 200 and the moving blade holder 300 together into the stationary blade holder 101 from below, so that the cutting teeth of the first moving blade 200 are opposite to the first stationary blade 102, and use a snap-fit ​​to lock the first moving blade. Then, insert the second moving blade, and then cover the second stationary blade 103 from below into place, so that the side stationary blade teeth 104 of the second stationary blade 103 are opposite to the side cutting teeth 510 of the second moving blade 500, and align the edge of the second stationary blade 103 with the hook on the stationary blade holder 101. Finally, press the second stationary knife 103 to make the hook elastically deform and then snap into place. Multiple buckle structures pass through or press the second stationary knife 103, the moving knife holder 300 (and the first moving knife 200) at the same time, locking the three together. At the same time, the second moving knife is movably fixed between the moving knife holder and the second stationary knife.

[0054] This invention provides an integrated hair trimmer head, which simultaneously features a central cutting area and a side cutting area within a single blade housing. The first moving blade and the side blades are arranged in an "I" or "T" shape in space, and are connected by a linkage mechanism to achieve reciprocating motion in opposite directions. The essence of this invention lies in achieving reverse motion between different areas (center and side) of a single blade head, rather than between two independent blade heads. That is, this invention improves the cutting efficiency of both the central and side areas within a single blade head of limited width, and utilizes the reverse motion to cancel out inertial forces. Furthermore, in this invention, the first moving blade and the side blades are directly coupled via a rigid linkage, and the structure of this invention ensures that the reverse motion between the first moving blade and the side blades has almost no phase difference, achieving true "synchronous reverse motion."

[0055] Example 1 like Figure 2 and Figure 3 As shown, a linkage mechanism is provided between the drive unit 520 and the movable tool holder 300 to convert the reciprocating motion of the movable tool holder 300 into the reverse reciprocating motion of the second movable tool. In this embodiment, the drive mechanism (not shown) directly drives the movable tool holder 300 of the first movable tool 200 to reciprocate along a second direction, and converts this motion into the reciprocating motion of the second movable tool 500 along the opposite first direction through a sophisticated linkage mechanism. In other words, in this embodiment, the first movable tool 200 is the driving member, and the second movable tool 500 is the driven member.

[0056] Specifically, a linkage mechanism is provided between the drive unit 520 of the second moving blade 500 and the moving blade holder 300. This linkage mechanism is used to convert the reciprocating motion of the moving blade holder 300 into the reverse reciprocating motion of the second moving blade 500. The linkage mechanism includes at least one link 400. The middle part of the link 400 (i.e., the position between its two ends) is rotatably connected to the second stationary blade 103 of the stationary blade assembly 100 (or the corresponding pivot seat on the stationary blade holder 101) via a pivot shaft. One end of the link 400 is connected to the second moving blade 500, and the other end is connected to the moving blade holder 300.

[0057] To ensure smooth motion transmission and balanced force distribution, the linkage mechanism in this embodiment preferably includes two connecting rods 400, which are respectively disposed at both ends of the reciprocating motion direction of the second moving cutter 500 (i.e., the front and rear sides along the motion direction of the second moving cutter 500). The two connecting rods 400 have identical structures, are symmetrically arranged, and jointly undertake the motion conversion function.

[0058] Each connecting rod 400 is generally elongated, with a pivot hole in its center, and is rotatably mounted on the second stationary cutter 103 via a pivot shaft (such as a pin). To avoid excessive local stress or wear on the second stationary cutter 103 during movement, this embodiment preferably provides a bushing 600 between the pivot shaft and the second stationary cutter 103. The bushing 600 is fitted onto the pivot shaft, and its outer wall mates with the mounting hole on the second stationary cutter 103, thereby reducing direct friction between the pivot shaft and the second stationary cutter 103, improving transmission smoothness and component life.

[0059] The end face of the bushing 600 facing the second moving cutter 500 is configured to be slightly higher than the adjacent surface of the second moving cutter 500. Specifically, the upper surface of the drive portion 520 of the second moving cutter 500 (or the area that may contact the connecting rod 400) has a reference plane. This end face of the bushing 600 is relatively higher than this reference plane.

[0060] During the swinging process of connecting rod 400, the rod body or its central region may come into contact with the surface of the second moving cutter 500 due to manufacturing tolerances, assembly clearances, or deformation under stress. Without the raised design of bushing 600, connecting rod 400 might form surface contact with the second moving cutter 500 (e.g., the side of connecting rod 400 would be in contact with the upper surface of the second moving cutter 500), resulting in a larger contact area and greater frictional resistance. The situation changes when the end face of bushing 600 is slightly higher than the surface of the second moving cutter 500: During the swing, the connecting rod 400 first contacts the protruding end face of the bushing 600, not the surface of the second moving cutter 500. Since the end face area of ​​the bushing 600 is much smaller than the area that the second moving cutter 500 may contact, the connecting rod 400 and the end face of the bushing 600 form a small-area point contact or line contact.

[0061] Even if the connecting rod 400 moves closer to the second moving cutter 500 due to deformation or vibration, the main body of the connecting rod 400 is raised due to the "protrusion" formed on the end face of the bushing 600, making it difficult for it to directly contact the surface of the second moving cutter 500. Therefore, the actual contact between the connecting rod 400 and the second moving cutter 500 is limited to a small area between the connecting rod 400 and the end face of the bushing 600, rather than the entire possible contact surface.

[0062] Reducing the contact area can decrease frictional resistance. In situations with relative oscillation and complex lubrication conditions, reducing the contact area can reduce adhesive wear and abrasive wear, especially when tiny hairs or debris enter, as smaller contact surfaces are less prone to jamming.

[0063] Furthermore, wear is concentrated on the end face of the replaceable or more wear-resistant bushing 600, rather than on the surface of the second moving cutter 500. The bushing 600 can be made of a highly wear-resistant material and has low replacement costs; while the second moving cutter 500 has high machining accuracy, and maintaining its surface integrity is beneficial for long-term shearing performance.

[0064] Even if the second moving tool 500 or the connecting rod 400 has a slight error in the height direction, the protruding end face of the bushing 600 can still ensure priority contact, avoiding large-area friction caused by part tolerances.

[0065] The connecting rod 400 has upward or downward protruding linkage shafts at both ends (not individually labeled in the figure). Correspondingly, the moving tool holder 300 and the second moving tool 500 are respectively provided with linkage holes or linkage grooves (marked as 502 in the figure) that slide with the corresponding linkage shafts. Specifically: The moving tool holder 300 is provided with a first linkage hole (or drive hole), and the linkage shaft at one end of the connecting rod 400 is inserted into the first linkage hole; The second moving cutter 500 (specifically its driving part 520) is provided with a second linkage hole (or driven hole), and the linkage shaft at the other end of the connecting rod 400 is inserted into the second linkage hole.

[0066] In one embodiment, the second linkage hole and / or the first linkage hole are circular holes, so that their diameters are matched with the shaft diameter of the linkage shaft, resulting in high linkage sensitivity.

[0067] In one embodiment, the second linkage hole and / or the first linkage hole are elongated holes, the length of which extends in the direction perpendicular to the direction of movement, and the width is adapted to the shaft diameter of the linkage shaft to prevent jamming.

[0068] To achieve the reverse transmission of motion from the moving tool holder 300 to the second moving tool 500, the first linkage hole on the moving tool holder 300 and the second linkage hole on the second moving tool 500 are located on both sides of the pivot axis of the connecting rod 400 in the direction of reciprocating motion of the second moving tool 500. In other words, please refer to... Figure 4 When the connecting rod 400 swings around its central pivot, the direction of motion of one end (connected to the moving tool holder 300) is always opposite to the direction of motion of the other end (connected to the second moving tool 500).

[0069] Assuming that when the movable tool holder 300 is driven by a driving mechanism (e.g., an eccentric wheel driven by a motor) to move in the positive X direction, the end of the connecting rod 400 connected to the movable tool holder 300 also moves in the positive X direction. Due to the lever principle, the connecting rod 400 swings clockwise (or counterclockwise, depending on the view direction) around its pivot axis, while its other end (the end connected to the second movable tool 500) moves in the opposite direction—the negative X direction. Conversely, when the movable tool holder 300 moves in the negative X direction, the connecting rod 400 drives the second movable tool 500 to move in the positive X direction. Thus, the reciprocating motion of the movable tool holder 300 is precisely converted into the reciprocating motion of the second movable tool 500 in the opposite direction through the swinging of the connecting rod 400.

[0070] Considering the pivot axis of the connecting rod 400 and the movement trajectory of the connecting rod 400 itself, the second moving cutter 500 is also provided with a first clearance structure 501. For example... Figure 4 As shown, the first clearance structure 501 can specifically be a groove or notch opened on the drive part 520 of the second moving cutter 500, and its position is opposite to the pivot axis of the connecting rod 400. In this embodiment, the first clearance structure 501 is constructed as a strip-shaped hole (or an elongated hole, waist-shaped hole). The strip-shaped hole extends along the reciprocating motion direction of the second moving cutter 500 (i.e., the first direction) and has a predetermined length and width. When the second moving cutter 500 reciprocates relative to the second stationary cutter 103, the first clearance structure 501 can effectively prevent the second moving cutter 500 from interfering with the pivot axis, ensuring that the stroke of the second moving cutter 500 is not obstructed.

[0071] The pivot shaft (or the corresponding bushing 600) of the connecting rod 400 passes through the first clearance structure 501. Specifically, the middle part of the connecting rod 400 is mounted on the second stationary tool 103 via the pivot shaft, and the bushing 600 is sleeved on the pivot shaft. The outer diameter of the bushing 600 is slightly smaller than the width of the first clearance structure 501 (i.e., the short axis dimension of the slotted hole), allowing the bushing 600 to slide relative to the other tool along its length within the slotted hole. At the same time, the length of the slotted hole (i.e., the long axis dimension) is greater than the outer diameter of the bushing 600, providing travel space for the reciprocating motion of the moving tool 500.

[0072] Through the above-described cooperation, the first clearance structure 501 and the bushing 600 (or pivot shaft) achieve the following dual functions: Guiding function: When the second moving cutter 500 is driven to reciprocate by the linkage mechanism, the inner wall of the slotted hole maintains contact or a slight clearance fit with the outer wall of the bushing 600. Since the slotted hole extends along the direction of motion, the bushing 600 acts as a fixed guide rail, and the slotted hole of the second moving cutter 500 slides along this guide rail. This limits the offset of the second moving cutter 500 in the direction perpendicular to the direction of motion (i.e., the width direction of the second moving cutter 500), ensuring that the second moving cutter 500 always moves along a precise straight trajectory, thereby guaranteeing the correct meshing and shearing clearance between the side moving cutter teeth and the side fixed cutter teeth 104.

[0073] Limiting function: The two ends of the slotted hole (i.e., the two ends along the direction of movement) form limiting surfaces. When the second moving cutter 500 moves to its limit position of travel, the end of the slotted hole contacts the bushing 600, preventing the second moving cutter 500 from continuing to move forward. Therefore, the length of the slotted hole determines the maximum reciprocating stroke of the second moving cutter 500. By designing the predetermined length of the slotted hole, the amplitude of the second moving cutter 500 can be precisely controlled, avoiding collision or disengagement between the moving and stationary cutter teeth due to overtravel. At the same time, this limiting function also prevents the second moving cutter 500 from exceeding its design range under unexpected force, thus providing protection.

[0074] In this embodiment, the bushing 600 not only reduces friction between the pivot shaft and the fixed tool 103, but also extends through the first clearance structure 501. The outer wall of the bushing 600 forms a sliding fit with the inner wall of the slotted hole. Because the bushing 600 is made of a wear-resistant material (such as bronze, powder metallurgy, or wear-resistant plastic), long-term sliding wear between it and the slotted hole of the second moving tool 500 is minimal. When wear reaches a certain level, only the bushing 600 needs to be replaced to restore the fit accuracy, without needing to replace the second moving tool 500, thus reducing maintenance costs.

[0075] The second moving tool is also provided with a second clearance structure 503, which, like the first clearance structure, is mainly used to avoid the moving tool holder. When the moving tool holder reciprocates relative to the second moving tool, it can effectively prevent the moving tool holder from interfering with the second moving tool.

[0076] Precise reverse motion can be achieved with just a simple linkage mechanism, eliminating the need for complex gear or double eccentric wheel structures. This results in fewer parts, simpler assembly, and lower costs. Meanwhile, the two symmetrically arranged linkages 400 ensure even force distribution on both sides of the second moving cutter 500, resulting in smooth movement. Furthermore, the bushing 600 and the first clearance structure 501 further enhance reliability and durability.

[0077] In this embodiment, the linkage mechanism (including two links 400) is configured such that its swing plane is parallel to the reciprocating motion plane of the second moving blade 500. Specifically, the plane containing the trajectory of the link 400 swinging about its central pivot axis is substantially parallel or coincident with the plane in which the second moving blade 500 (and the moving blade holder 300) reciprocates along a first or second direction. In other words, all moving parts—including the swing of the link 400, the sliding of the second moving blade 500, and the sliding of the moving blade holder 300—occur in mutually parallel or coincident planes. This in-plane motion layout avoids the moving parts generating a component force perpendicular to the shearing plane, thereby reducing unnecessary friction and energy loss, ensuring transmission efficiency, and simplifying the overall thickness design of the blade head.

[0078] In this embodiment, the bottom of the first moving blade assembly (including the first moving blade 200 and its fixedly connected moving blade holder 300) is in contact with or slides against the upper surface of the second moving blade 500. Specifically, please refer to... Figure 2 The lower surface of the moving tool holder 300 (i.e., the side facing the second moving tool 500) is in contact with the upper surface of the drive part 520 of the second moving tool 500. A small gap can be left between them and filled with grease, or they can be in direct surface contact. When the moving tool holder 300 is driven by the drive mechanism to reciprocate in the second direction, its bottom slides relative to the upper surface of the second moving tool 500. This contact engagement serves two purposes: first, the moving tool holder 300 provides a vertical (i.e., perpendicular to the shearing plane) limit for the second moving tool 500, preventing the second moving tool 500 from jumping upwards and disengaging from the stationary blade teeth; second, the sliding engagement between them serves as an auxiliary guide, improving the smoothness of the movement of the second moving tool 500. Because the upper surface of the second moving tool 500 remains in contact with the bottom of the moving tool holder 300, the second moving tool 500 is always constrained between the second stationary blade 103 and the moving tool holder 300 during reciprocating motion, eliminating the need for additional clamping elements.

[0079] To accommodate the aforementioned linkage mechanism and avoid motion interference, a first clearance space 310 is provided at the bottom of the first moving tool assembly (i.e., the lower surface of the moving tool holder 300). Specifically, the first clearance space 310 may be a recessed area, groove, or through slot formed on the lower surface of the moving tool holder 300. The thickness of the first clearance space 310 (i.e., the depth of the recess) matches the thickness of the linkage mechanism (mainly the connecting rod 400), allowing the connecting rod 400 to be completely accommodated within the first clearance space 310 and to swing freely within it without contacting the moving tool holder 300.

[0080] In detail, the middle part of the connecting rod 400 is mounted on the second stationary blade 103 via a pivot shaft, and its two ends are connected to the second moving blade 500 and the moving blade holder 300, respectively. When the moving blade holder 300 reciprocates, the connecting rod 400 swings around the pivot shaft, and its body will have relative displacement with respect to the lower surface of the moving blade holder 300. Without the first clearance space 310, the body of the connecting rod 400 may rub or collide with the lower surface of the moving blade holder 300. However, by providing the first clearance space 310, the thickness direction of the connecting rod 400 is completely contained within the recessed area of ​​the moving blade holder 300, and the main body of the moving blade holder 300 will not press against the connecting rod 400 during movement. At the same time, the first clearance space 310 should be large enough in the horizontal direction to allow the connecting rod 400 to not contact the side wall of the clearance space even at the maximum swing angle.

[0081] This design effectively hides all moving surfaces beneath the moving blade holder 300. On one hand, most of the cut hair falls directly under gravity, preventing it from actively drifting upwards or sideways to the bottom area. On the other hand, the moving blade holder 300 itself, as a relatively large moving component, dynamically shields the space above it during its reciprocating motion, further preventing hair debris from seeping downwards into the lower connecting rod area. Even if a small amount of tiny debris accidentally enters, due to its lower position and relatively enclosed mating surfaces, it is more likely to fall off and be expelled during vibration, rather than accumulating over time.

[0082] Example 2 like Figure 5 and Figure 6 As shown, a linkage mechanism is provided between the drive unit 520 and the movable tool holder 300 to convert the reciprocating motion of the second movable tool into the reverse reciprocating motion of the movable tool holder. Unlike Embodiment 1, in this embodiment, the drive mechanism (not shown) directly acts on the second movable tool 500, making the second movable tool 500 the driving member; while the movable tool holder 300 (and the first movable tool 200 fixed thereon) is the driven member. Through the linkage mechanism provided between the drive unit 520 of the second movable tool 500 and the movable tool holder 300, the reciprocating motion of the second movable tool 500 is converted into the reverse reciprocating motion of the movable tool holder 300.

[0083] Similar to Embodiment 1, the linkage mechanism in this embodiment also includes at least one link 400. The middle part of the link 400 is rotatably connected to the second stationary blade 103 (or stationary blade holder 101) of the stationary blade assembly 100 via a pivot shaft. One end of the link 400 is connected to the second moving blade 500, and the other end is connected to the moving blade holder 300.

[0084] To achieve a smoother force and motion transmission, this embodiment also preferably uses two connecting rods 400, which are respectively arranged at both ends of the reciprocating motion direction of the second moving cutter 500 (i.e., on the left and right sides along the motion direction of the second moving cutter 500), in a symmetrical arrangement.

[0085] like Figure 7 As shown, in this embodiment, the second moving cutter 500 is provided with a first clearance structure 501. Unlike a conventional circular clearance hole, the first clearance structure 501 in this embodiment is constructed as a strip-shaped hole (or elongated hole, waist-shaped hole). This strip-shaped hole extends along the reciprocating motion direction of the second moving cutter 500 (i.e., the first direction) and has a predetermined length and width.

[0086] The pivot shaft (or the corresponding bushing 600) of the connecting rod 400 passes through the first clearance structure 501. Specifically, the middle part of the connecting rod 400 is mounted on the second stationary tool 103 via the pivot shaft, and the bushing 600 is sleeved on the pivot shaft. The outer diameter of the bushing 600 is slightly smaller than the width of the first clearance structure 501 (i.e., the short axis dimension of the slotted hole), allowing the bushing 600 to slide relative to the other tool along its length within the slotted hole. At the same time, the length of the slotted hole (i.e., the long axis dimension) is greater than the outer diameter of the bushing 600, providing travel space for the reciprocating motion of the moving tool 500.

[0087] Through the above-described cooperation, the first clearance structure 501 and the bushing 600 (or pivot shaft) achieve the following dual functions: Guiding function: When the second moving cutter 500 is driven by the drive mechanism to reciprocate along the first direction, the inner wall of the slotted hole maintains contact or a slight clearance fit with the outer wall of the bushing 600. Since the slotted hole extends along the direction of movement, the bushing 600 acts as a fixed guide rail, and the slotted hole of the second moving cutter 500 slides along this guide rail. This limits the offset of the second moving cutter 500 in the direction perpendicular to the direction of movement (i.e., the width direction of the second moving cutter 500), ensuring that the second moving cutter 500 always moves along a precise straight trajectory, thereby guaranteeing the correct meshing and shearing clearance between the side moving cutter teeth and the side fixed cutter teeth 104.

[0088] Limiting function: The two ends of the slotted hole (i.e., the two ends along the direction of movement) form limiting surfaces. When the second moving cutter 500 moves to its limit position of travel, the end of the slotted hole contacts the bushing 600, preventing the second moving cutter 500 from continuing to move forward. Therefore, the length of the slotted hole determines the maximum reciprocating stroke of the second moving cutter 500. By designing the predetermined length of the slotted hole, the amplitude of the second moving cutter 500 can be precisely controlled, avoiding collision or disengagement between the moving and stationary cutter teeth due to overtravel. At the same time, this limiting function also prevents the second moving cutter 500 from exceeding its design range under unexpected force, thus providing protection.

[0089] In this embodiment, the bushing 600 not only reduces friction between the pivot shaft and the fixed tool 103, but also extends through the first clearance structure 501. The outer wall of the bushing 600 forms a sliding fit with the inner wall of the slotted hole. Because the bushing 600 is made of a wear-resistant material (such as bronze, powder metallurgy, or wear-resistant plastic), long-term sliding wear between it and the slotted hole of the second moving tool 500 is minimal. When wear reaches a certain level, only the bushing 600 needs to be replaced to restore the fit accuracy, without needing to replace the second moving tool 500, thus reducing maintenance costs.

[0090] The end face of the bushing 600 can adopt the feature of "slightly higher than the moving tool surface" in Embodiment 1 (see the foregoing description) to further reduce the contact area and frictional resistance.

[0091] Unlike Embodiment 1, where the drive mechanism directly drives the moving tool holder 300, in this embodiment, the drive mechanism (e.g., an eccentric shaft driven by a motor or a linear reciprocating motor) is directly connected to the second moving tool 500. Therefore, the second moving tool 500 is provided with a linkage structure 504 for linkage with the drive mechanism.

[0092] Specifically, such as Figure 8 As shown, the linkage structure 504 can be a lug, protrusion, or connecting arm extending upward or downward from the second moving cutter 500 (preferably its driving part 520). Two lugs, protrusions, or connecting arms are arranged along the moving direction, forming a space between them that can cooperate with the drive shaft of the drive mechanism. When the drive mechanism is activated, the drive pin drives the linkage structure 504, thereby driving the entire second moving cutter 500 to reciprocate along the first direction.

[0093] By directly applying the drive mechanism to the second moving blade 500 and using a linkage mechanism essentially the same as in Embodiment 1 to transmit the motion in the reverse direction to the moving blade holder 300 and the first moving blade 200, this embodiment provides a flexible layout option. In certain blade head spatial layouts, the installation position of the drive mechanism is more convenient for directly driving the second moving blade 500, making the structure of this embodiment particularly suitable. Simultaneously, since the driving component is the second moving blade 500, its mass is typically greater than that of the first moving blade 200 and the moving blade holder 300. Through the reverse transmission of the linkage mechanism, the inertia of the second moving blade 500 can be effectively utilized, achieving a smoother cutting effect under certain working conditions. Similar to Embodiment 1, this embodiment also has the advantages of fewer parts, simple assembly, and low cost.

[0094] Example 3 like Figure 9 and Figure 10As shown, the second moving blade 500 includes side blades 510 located on both sides and a drive unit 520 connecting the two side blades 510. The drive unit 520 is generally plate-shaped or frame-shaped, and has an integrally formed or fixedly mounted ear portion 530 for connecting the connecting rod. In this embodiment, the ear portion 530 is preferably two, and the two ear portions 530 are symmetrically arranged front and back along the reciprocating motion direction (i.e., the first direction) of the second moving blade 500. A limiting space 550 is formed between the two ear portions 530, which is used to accommodate at least a portion of one end of the connecting rod 400. This double ear portion design makes the connection between the connecting rod 400 and the second moving blade 500 more stable, restricts the movement of the connecting rod end perpendicular to the motion direction, and improves the transmission accuracy.

[0095] To further improve the connection stability between the connecting rod 400 and the second moving blade 500 and avoid motion interference, the first end of the connecting rod 400 (i.e., the end connected to the second moving blade 500) extends further to form a protrusion 410. This protrusion 410 can be cylindrical, rectangular, or spherical, and it protrudes outward from the end face or side face of the first end of the connecting rod 400. The protrusion 410 of the connecting rod 400 is movably positioned within the limiting space 550.

[0096] The limiting space 550 can be a closed cavity or a groove or slot with an opening. In a preferred embodiment, the limiting space 550 is formed by two ears 530 on the second moving blade 500 and the driving part 520. Specifically, the two ears 530 are arranged opposite each other, forming a receiving cavity between them, which serves as the limiting space 550. The first end of the connecting rod 400 extends into the receiving cavity, and the protrusion 410 at its end further extends into the depth of the limiting space 550, and is limited by the side wall of the ear 530 or a stop provided inside the ear 530. A small gap is maintained between the protrusion 410 and the inner wall of the limiting space 550, allowing the protrusion 410 to rotate and slide within the limiting space 550, but preventing the first end of the connecting rod 400 from accidentally dislodging from the ear 530. This bump-limiting space cooperation structure is equivalent to a movable hinge, which not only transmits driving force, but also ensures that the connecting rod 400 and the second moving blade 500 remain connected during the movement, without the need for additional fasteners.

[0097] Meanwhile, considering that the rod body or protrusion 410 of the connecting rod 400 may interfere with the drive part 520 of the second moving blade 500 during the swinging process, this embodiment provides a second clearance space 540 at the drive part 520 of the second moving blade 500.

[0098] It should be noted that the driving part 520 refers to the part of the second moving blade 500 that directly or indirectly receives the driving force of the connecting rod 400. In this embodiment, it refers to the driving part 520 of the second moving blade 500, especially the area of ​​the driving part 520 near the ear 530.

[0099] The second clearance space 540 can specifically be a groove, notch, through hole, or stepped surface formed on the drive unit 520. For example... Figure 8 As shown, a concave arc-shaped notch or rectangular groove is machined on the drive part 520 of the second moving cutter 500, corresponding to the position of the swing trajectory of the connecting rod 400. This notch or groove constitutes the second clearance space 540. When the connecting rod 400 swings around its central pivot axis, the movement path of its first end and the protrusion 410 will partially enter the second clearance space 540. However, since the second clearance space 540 provides additional clearance space, no part of the connecting rod 400 will physically contact or collide with the drive part 520 of the second moving cutter 500.

[0100] At the extreme swing position of the link 400, the protrusion 410 or the first end of the link 400 may approach or even cross the original contour line of the drive unit 520. Without the second clearance space 540, interference may occur, leading to motion jamming or abnormal noise. With the second clearance space 540 provided, the swing range of the link 400 can be fully utilized, and the reciprocating stroke of the second moving blade 500 can be designed to be larger, thereby improving shearing efficiency.

[0101] The first moving blade 200 is mounted on the moving blade holder 300, and an elastic element (such as a spring) is preferably provided between them to provide preload. The moving blade holder 300 and the first moving blade 200 are configured as a single unit to reciprocate in a second direction relative to the intermediate shearing region 110 of the stationary blade assembly 100.

[0102] In this embodiment, the linkage mechanism is disposed on both sides of the moving tool holder 300 (i.e., the left and right sides along the reciprocating motion direction of the second moving tool 500). The linkage mechanism is used to convert the reciprocating motion of the moving tool holder 300 into the reverse reciprocating motion of the second moving tool 500. Specifically, each linkage mechanism includes a link 400. The middle part of the link 400 is rotatably connected to the stationary tool holder 101 of the stationary tool assembly 100 (or directly to the second stationary tool 103) through a pivot shaft. One end of the link 400 (referred to as the first end for ease of description) is connected to the ear 530 of the second moving tool 500, and the other end (the second end) is connected to the moving tool holder 300.

[0103] Since there is a linkage mechanism on each side of the moving tool holder 300, and the two linkages 400 are symmetrically arranged, they jointly undertake the functions of motion conversion and force transmission, thereby ensuring that the second moving tool 500 is subjected to balanced forces on both sides and moves smoothly.

[0104] Each link 400 is generally elongated and has a pivot hole in its middle. It is rotatably mounted on the stationary tool holder 101 via a pivot shaft (e.g., a pin). To avoid wear or stress concentration on the stationary tool holder 101 caused by the pivot shaft, a bushing (not shown in the figure, see bushing 600 in Embodiment 1) can be provided between the pivot shaft and the stationary tool holder 101.

[0105] The first end of the connecting rod 400 (the end connected to the second moving blade 500) extends into the receiving space formed between the two ears 530. Figure 11 As shown, in this embodiment, the first end of the connecting rod 400 is directly engaged with the two lugs 530, without the need for additional linkage shafts or pins. By directly engaging the two, the reciprocating swing force of the connecting rod 400 can be efficiently and directly transmitted to the lugs 530 of the second moving blade 500, reducing transmission clearance and the number of parts, while also facilitating assembly and maintenance.

[0106] The movable tool holder 300 has a corresponding groove for accommodating the second end of the connecting rod 400. Specifically, the groove can be an elongated sliding groove or a limiting groove formed on the bottom or side of the movable tool holder 300. The second end of the connecting rod 400 (i.e., the end connected to the movable tool holder 300) is directly embedded in the groove to form a sliding fit.

[0107] In this embodiment, the connecting rod 400 and the second moving blade 500 are connected by a snap-fit ​​connection via the ear 530, and the connecting rod 400 and the moving blade holder 300 are connected by an embedded connection via a slot, achieving a purely mechanical direct transmission. Both connection methods eliminate the need for additional parts such as pins and bushings, simplifying the assembly process and reducing potential failure points. Simultaneously, because the snap-fit ​​and embedded structures themselves have a certain clearance, they can adapt to minor runouts and manufacturing tolerances during movement, resulting in smoother transmission. Furthermore, this open connection structure facilitates the removal of hair and debris, preventing accumulation at the connection point and further improving the cleanliness and reliability of the blade head.

[0108] In other embodiments, the two ends of the connecting rod can extend toward the ear or the second moving tool holder to form pins, and the pins can be used to form a linkage with the two.

[0109] When the drive mechanism (not shown, see the aforementioned embodiment) drives the moving blade holder 300 (and thus the first moving blade 200) to reciprocate in the second direction (e.g., to the right), the moving blade holder 300 drives the second end of the connecting rod 400 to move in the positive X direction. The connecting rod 400 oscillates about its central pivot axis, and its first end (the end connected to the second moving blade 500) moves in the opposite direction—that is, in the negative X direction. Since the first end is connected to the second moving blade 500 through the ear 530, the second moving blade 500 moves accordingly in the negative X direction. Conversely, when the moving blade holder 300 moves to the left, the connecting rod 400 drives the second moving blade 500 to move in the negative X direction. Thus, the reciprocating motion of the moving blade holder 300 is precisely converted into the reciprocating motion of the second moving blade 500 in the opposite direction, realizing the reverse shearing of the first moving blade 200 and the second moving blade.

[0110] The second moving cutter 500 is provided with a second clearance structure 503. Specifically, the second clearance structure 503 can be a groove, notch, or stepped surface formed on the drive portion 520 of the second moving cutter 500, positioned opposite the moving cutter holder 300. When the second moving cutter 500 reciprocates relative to the stationary cutter assembly 100, the second clearance structure 503 effectively prevents the second moving cutter 500 from colliding or rubbing against the moving cutter holder 300, ensuring sufficient clearance between them when they move in opposite directions.

[0111] like Figure 12 As shown, in order to achieve precise guiding and coordination among the second moving blade 500, the second stationary blade 103, and the first moving blade assembly, this embodiment provides bent ear plate structures at both ends of the movement direction of the second moving blade 500, and provides corresponding mating structures on the moving blade holder 300 and the second stationary blade 103.

[0112] Specifically, the second moving blade 500 is bent upward at both ends in its reciprocating motion direction (first direction) to form upper ear plates 505. The upper ear plates 505 can be integrally stamped from the end of the driving part 520 of the second moving blade 500 and are generally vertical or slightly inclined plate-shaped.

[0113] Correspondingly, the movable tool holder 300 is provided with a guide groove (not separately labeled in the figure) adapted to the upper ear plate 505. This guide groove is a strip-shaped or rectangular groove extending along the movement direction of the movable tool 500, with a width slightly greater than the thickness of the upper ear plate 505 and a length greater than or equal to the stroke of the movable tool 500. During assembly, the upper ear plate 505 of the second movable tool 500 is inserted into the guide groove of the movable tool holder 300, forming a sliding fit. When the second movable tool 500 is driven to reciprocate along the first direction, the upper ear plate 505 slides within the guide groove. The sidewall of the guide groove restricts the offset of the upper ear plate 505 perpendicular to the movement direction, thereby ensuring that the movement trajectory of the movable tool 500 is a precise straight line. Simultaneously, the length of the guide groove also serves a clearance function, allowing the second movable tool to move in the opposite direction to the first movable tool.

[0114] Simultaneously, the second moving blade 500 is bent downwards at both ends in its direction of movement to form lower ear plates 506. The lower ear plates 506 are located outside the upper ear plate 505, that is, at the front and rear ends in the direction of movement.

[0115] Correspondingly, the second stationary blade 103 is provided with a third clearance structure 105 adapted to the lower ear plate 506. This third clearance structure 105 can be a groove, notch, or through slot formed at the contact point between the second stationary blade 103 and the second moving blade, and its shape matches the lower ear plate 506. When the second moving blade 500 is installed in place, the lower ear plate 506 extends into the third clearance structure 105 and can slide freely within it along the direction of movement. The sidewalls of the third clearance structure 105 also guide and limit the lower ear plate 506, restricting the movement of the second moving blade 500 in the vertical and width directions.

[0116] Through the cooperation between the upper ear plate 505 and the guide groove of the moving tool holder 300, and the cooperation between the lower ear plate 506 and the third clearance structure 105 of the second stationary tool 103, the second moving tool 500 achieves precise guiding constraint in both the vertical and horizontal directions. Specifically: Upper ear plate 505 and guide groove: mainly provide guidance and avoidance for the upper part, prevent the first moving tool from swinging left and right during the movement, and at the same time provide avoidance space for the reverse movement of the second moving tool.

[0117] Lower ear plate 506 and third clearance structure 105: provide lower guidance and limit to prevent the second moving cutter 500 from deflecting.

[0118] Together, they form a "clamping" guiding system, ensuring that the second moving cutter 500 maintains the correct posture during high-speed reciprocating motion, and that the meshing clearance between its side moving cutter teeth and the side fixed cutter teeth 104 of the fixed cutter 103 is uniform and stable. Even under external impact or long-term wear, the movement trajectory of the second moving cutter 500 will not deviate significantly.

[0119] The linkage mechanism is located on both sides of the moving tool holder 300, which ensures symmetrical force distribution and smooth movement. Combined with the double-ear structure, it further reduces vibration and noise.

[0120] Example 4 like Figure 14 As shown, the stationary blade holder 101, the first moving blade assembly, the second stationary blade 103, the second moving blade 500, and the pressure plate 600 are stacked sequentially. The first moving blade assembly and the second moving blade 500 are located on the upper and lower sides (or opposite sides) of the second stationary blade 103, respectively. Specifically, the second stationary blade 103 serves as the intermediate reference layer of the entire shearing mechanism, with the first moving blade assembly on one side and the second moving blade 500 on the other side.

[0121] The first moving blade assembly includes a first moving blade 200. Correspondingly, a first stationary blade 102 is fixedly disposed on the stationary blade holder 101. The first moving blade 200 and the inner surface of the first stationary blade 102 are in close contact, forming a first reciprocating shearing motion pair. During operation, the first moving blade 200 performs high-speed reciprocating linear motion relative to the stationary first stationary blade 102, thereby cutting off materials (such as hair) that extend into the mesh of the first stationary blade 102.

[0122] The second moving blade 500 has second moving blade teeth on one or both sides of its edge. Correspondingly, side stationary blade teeth (as an integrated extension or additional component of the second stationary blade 103) are provided on the corresponding side or both sides of its edge. The second moving blade teeth and the corresponding side stationary blade teeth interlock and mesh with each other, forming a second reciprocating shearing motion pair. When the second moving blade 500 is driven to reciprocate, its second moving blade teeth shear relative to the fixed side stationary blade teeth, thereby cutting the material that enters laterally.

[0123] A linkage mechanism is disposed between the first moving blade assembly and the second stationary blade 103. In this embodiment, there are two linkage mechanisms, located at opposite ends of the movement direction. One end of the linkage mechanism is connected to the moving blade holder of the first moving blade assembly, and the other end passes through the second stationary blade 103 and is linked to the second moving blade 500.

[0124] The second stationary blade 103 is provided with a through hole extending through its upper and lower sides. The through hole is used to accommodate and guide the movement of the linkage mechanism. Specifically, the linkage mechanism passes through the through hole to connect the first moving blade assembly and the second moving blade 500, and can swing freely within the through hole, thereby transmitting the power of the first moving blade assembly to the second moving blade 500 or transmitting the power of the second moving blade 500 to the first moving blade assembly.

[0125] The connecting hole includes a central through hole and at least one arc-shaped clearance groove. The central through hole is located in the middle of the connecting hole and is used to accommodate and position the pivot shaft of the linkage mechanism. The arc-shaped clearance groove is located beside the central through hole. The linkage shaft of the linkage mechanism passes through the arc-shaped clearance groove. To ensure that the linkage shaft has sufficient clearance space and smooth movement during the swing of the linkage mechanism, the center of the arc of the arc-shaped clearance groove coincides with the axis of the central through hole. Thus, when the linkage mechanism swings around the pivot shaft, the linkage shaft can swing synchronously with the linkage mechanism and always move along the trajectory of the arc-shaped clearance groove, avoiding interference. The arc-shaped clearance groove is not a simple clearance structure; its radius of curvature precisely matches the motion trajectory of the linkage mechanism. Therefore, the arc-shaped clearance groove not only provides physical clearance space but also serves as a sliding track for the linkage shaft, forcing the linkage shaft to move along a preset arc, thereby accurately converting the complex motion of the linkage mechanism into the linear reciprocating motion of the first moving cutter 200 and the second moving cutter 500.

[0126] Furthermore, the upper surface of the second stationary blade 103 and the bottom of the first moving blade assembly together form a first clearance space 310. The linkage mechanism is disposed within this first clearance space 310 and can swing freely within it without interfering with the first moving blade assembly or the second stationary blade 103. To achieve this function, the height of the first clearance space 310 is set to be greater than the thickness of the linkage mechanism. Simultaneously, the swing trajectory of the linkage mechanism has a pre-reserved gap in the height direction of the first clearance space 310, ensuring that the linkage mechanism will not contact the top or bottom wall of the first clearance space 310 during swinging, thereby guaranteeing the flexibility and reliability of the swing.

[0127] The first clearance space 310 is connected to the space below the second stationary blade 103 through the connecting hole. The linkage mechanism passes sequentially through the first clearance space 310 and the connecting hole, extends to the bottom of the second stationary blade 103, and forms a transmission engagement with the second moving blade 500. In this way, while obtaining the upper swing space, the linkage mechanism can transmit motion downward to drive the second moving blade 500 to perform a predetermined action.

[0128] The pressure plate 600 and the stationary knife holder 101 are connected and cooperate with each other by fasteners (such as screws and buckles) to clamp and fix the second stationary knife 103 and the second moving knife 500 therein.

[0129] The vertical distance between the pressure plate 600 and the second stationary blade 103 is precisely set to form a moving gap. This gap precisely accommodates the thickness of the second moving blade 500 and allows the second moving blade 500 to slide back and forth without obstruction, while maximally limiting the vertical movement of the second moving blade 500 (i.e., jumping perpendicular to the shearing direction).

[0130] Meanwhile, the pressure plate is provided with multiple elastic support plates 610 facing the second moving blade. Each elastic support plate 610 is a cantilevered thin-plate structure, with its root connected to the pressure plate 600 body, and its free end tilted upwards or bent in a wavy shape towards the second moving blade 500. The multiple elastic support plates 610 are arranged in an array along the reciprocating motion direction of the second moving blade 500.

[0131] The free end of the elastic support plate 610 elastically abuts against the back of the second moving blade 500 with preload. When the second moving blade 500 reciprocates, the elastic support plate 610 provides continuous and uniform normal pressure to ensure that the second moving blade teeth and the side stationary blade teeth always maintain close contact, preventing the blade teeth from separating and "missing cuts" due to vibration caused by high-speed movement.

[0132] The contact end between the elastic support plate 610 and the second moving blade 500 may be provided with hemispherical protrusions or embedded with rolling elements (micro-balls or needle rollers).

[0133] Furthermore, the first and second moving blades are integrated into the same blade assembly. Specifically: Noise detection: Since all moving parts (first moving blade, side blade, linkage mechanism) are installed in the same blade housing, the operating noise can be independently tested without assembling the entire machine by simply mounting the blade assembly on a dedicated noise testing fixture. The opposing movements of the first moving blade and the side blade partially cancel out the inertial forces, resulting in a relatively simple noise spectrum, which facilitates rapid judgment on the production line.

[0134] Sharpness testing: A standard test medium (such as artificial hair or test strip) can be placed simultaneously in the central shearing area and the side shearing area. By driving the second moving cutter head assembly and measuring the shearing force or cutting rate, the sharpness of different areas of the entire cutter head can be evaluated in one go. Compared with the method that requires testing two independent cutter heads separately, this invention significantly reduces the number of testing stations and the testing time.

[0135] Motion synchronization check: The first moving cutter and the side cutter are directly coupled through a linkage mechanism. The reverse motion stroke and phase relationship between the two can be directly measured on a single cutter head assembly using a high-speed camera or displacement sensor. Any asynchrony in motion caused by assembly errors can be quickly detected and fed back to the assembly station.

[0136] In summary, this invention integrates the reverse motion functions, originally distributed between two independent cutter heads, into a single, unified cutter head assembly. This allows finished product manufacturers to perform offline or online testing of key quality indicators such as noise, sharpness, and motion synchronization on a single cutter head assembly unit on the production line. This not only simplifies the testing process and reduces the investment cost of testing equipment, but also facilitates the establishment of a standardized quality control system, thereby improving production efficiency and product yield.

[0137] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A hair trimmer blade, characterized in that: It includes: The stationary blade assembly (100) includes a stationary blade holder (101) and a first stationary blade (102) and a second stationary blade (103) fixed thereon. The first stationary blade (102) and the second stationary blade (103) cooperate with the stationary blade holder (101) to form an installation space inside the stationary blade holder (101). The stationary blade assembly has an intermediate shearing area (110) formed by the first stationary blade (102) and side shearing areas (120) located on one or both sides of the intermediate shearing area (110). The second moving blade (500) is configured to reciprocate relative to the second stationary blade (103) in a first direction in the side shearing region (120); The first moving blade assembly is configured to reciprocate relative to the first stationary blade (102) in a second direction within the intermediate shearing region (110); A linkage mechanism, disposed within the installation space, connects the second moving blade (500) and the first moving blade assembly, such that their first and second directions are opposite during movement.

2. The hair trimmer head according to claim 1, characterized in that: The first moving blade assembly includes a moving blade holder (300) and a first moving blade (200) that can be floated on the moving blade holder (300), and an elastic member for supporting the first moving blade (200) is provided between the first moving blade (200) and the moving blade holder (300).

3. The hair trimmer head according to claim 1, characterized in that: The second moving cutter (500) includes a side cutter (510) located on one or both sides and a drive unit (520) for driving the second moving cutter to reciprocate.

4. The hair trimmer head according to claim 1, characterized in that: The first moving blade assembly and the second moving blade (500) are stacked in the installation space in a direction perpendicular to the reciprocating motion, and the bottom of the first moving blade assembly is in contact with or slides with the upper surface of the second moving blade (500).

5. The hair trimmer head according to claim 1, characterized in that: The first moving blade assembly is disposed within the installation space, and the second moving blade (500) is located outside the installation space and slides in cooperation with the second stationary blade (103); along the direction perpendicular to the reciprocating motion, the first moving blade assembly and the second moving blade (500) are respectively located on the upper and lower sides of the second stationary blade (103).

6. The hair trimmer head according to any one of claims 1 to 4, characterized in that: The linkage mechanism is disposed between the first moving blade assembly and the second moving blade (500) or the second stationary blade (103), and the swing plane of the linkage mechanism is parallel to the reciprocating motion plane of the second moving blade (500).

7. The hair trimmer head according to claim 6, characterized in that: The bottom of the first moving blade assembly is provided with a first clearance space (310) for accommodating the linkage mechanism. The thickness of the first clearance space (310) matches the thickness of the linkage mechanism so that the linkage mechanism can swing freely within the first clearance space (310).

8. The hair trimmer head according to claim 6, characterized in that: The linkage mechanism includes at least one link (400), the middle of which is pivotally connected to the stationary tool holder in the second stationary tool (103) or stationary tool assembly (100), one end of which is connected to the second moving tool (500) and the other end of which is connected to the moving tool holder (300).

9. The hair trimmer head according to claim 8, characterized in that: The linkage mechanism includes two links (400), which are respectively located at both ends of the reciprocating motion direction of the second moving cutter (500).

10. The hair trimmer head according to any one of claims 1 to 4, characterized in that: The linkage mechanism includes two links (400), which are respectively disposed on both sides of the first moving blade assembly, and the swing plane of the two links (400) is perpendicular to the reciprocating motion plane of the second moving blade (500).

11. The hair trimmer head according to claim 10, characterized in that: The middle of each link (400) is pivotally connected to the stationary tool holder (101) of the stationary tool assembly (100), one end of each link (400) is connected to the second moving tool (500), and the other end is connected to the moving tool holder (300) on which the first moving tool (200) is mounted.

12. The hair trimmer head according to claim 11, characterized in that: The two links (400) form a symmetrical link pair between the second moving cutter (500) and the moving cutter holder (300), and the projection of the link pair in the reciprocating motion direction of the second moving cutter (500) at least partially overlaps with the projection of the first moving cutter (200).

13. The hair trimmer head according to claim 10, characterized in that: The drive portion (520) of the second moving blade (500) extends upward to form an ear (530) for cooperating with the connecting rod.

14. The hair trimmer head according to claim 13, characterized in that: There are two ears (530), which are arranged front and back along the first direction, and a limiting space (550) for limiting the connecting rod is formed between the two adjacent ears (530).

15. The hair trimmer head according to claim 14, characterized in that: One end of the connecting rod extends to form a protrusion (410) placed within the limiting space (550).

16. The hair trimmer head according to claim 15, characterized in that: The second moving cutter (500) has a second clearance space (540) at the drive part (520) for avoiding the connecting rod.

17. The hair trimmer head according to any one of claims 1 to 3 or 5, characterized in that: The second stationary blade (103) is provided with a through hole that extends through its upper and lower sides. The linkage mechanism passes through the through hole to connect the first moving blade assembly and the second moving blade (500), so that the linkage mechanism can swing freely within the through hole.

18. The hair trimmer head according to claim 17, characterized in that: The connecting hole includes: A central through hole is provided for accommodating the pivot shaft of the linkage mechanism; At least one arc-shaped clearance groove is provided on the side of the central through hole, and the linkage shaft of the linkage mechanism passes through the arc-shaped clearance groove; The arc center of the arc-shaped clearance groove coincides with the axis of the central through hole, so that the linkage shaft swings synchronously with the linkage mechanism within the arc-shaped clearance groove.

19. The hair trimmer head according to claim 17, characterized in that: The upper surface of the second stationary blade (103) and the bottom of the first moving blade assembly together form a first clearance space (310). The linkage mechanism is located in the first clearance space (310) and can swing freely in the first clearance space (310) without interfering with the first moving blade assembly and the second stationary blade (103).

20. The hair trimmer head according to claim 19, characterized in that: The height of the first clearance space (310) is greater than the thickness of the linkage mechanism, and the swing trajectory of the linkage mechanism has a gap in the height direction of the first clearance space (310).

21. The hair trimmer head according to claim 19, characterized in that: The first clearance space (310) is connected to the space below the second stationary blade (103) through the connecting hole, and the linkage mechanism passes through the connecting hole and is engaged with the second moving blade (500) in a transmission cooperation.

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