Hair trimming device

Abstract

The utility model relates to a hair trimming device which comprises a shell, a reciprocating blade set and a power source, the reciprocating blade set comprises a static knife and a movable knife, the static knife and the movable knife are respectively provided with a plurality of corresponding knife edges, the power source is arranged in the shell, and when the power source works, the movable knife is driven to reciprocate relative to the static knife to achieve the shearing action. The two reciprocating blade sets are arranged on the two sides of the power source respectively, the power source is located on the central axis of the two movable blades, an eccentric shaft is arranged on the power source, a transmission part is arranged in the shell and connected with the eccentric shaft, and when the power source works, the transmission part swings in the shell, and the power source is driven by the transmission part to rotate. And the transmission part is directly or indirectly connected to the movable cutter. By the adoption of the technical scheme, the multiple reciprocating blade sets are arranged and move synchronously, multiple positions can be trimmed at the same time, efficiency is improved, the motor is arranged in the middle, balance and stability are good, and trimming is stable.

Description

Technical Field

[0001] This utility model relates to the field of hair trimming technology, and in particular to a hair trimming device. Background Technology

[0002] A hair trimming device is an electrical appliance that uses a motor to drive a moving blade and a stationary blade to move relative to each other in order to shave or trim beards or hair. The hair trimming device consists of a moving blade, a stationary blade, a moving blade holder, a stationary blade holder, a motor, and a housing. It uses the shearing principle to cut beards or hair. In order to ensure the cutting effect, a torsion spring is used to keep the moving blade and the stationary blade in opposition.

[0003] In existing hair trimming devices, the motor is housed within the casing, and an eccentric shaft is connected to the motor's output shaft. This eccentric shaft is connected to the moving blade holder, and the motor's rotation drives the moving blade holder in reciprocating motion via the eccentric shaft. However, existing hair trimming devices only have a single-blade configuration, resulting in low trimming efficiency. Furthermore, the motor is not located in the middle of the moving blade's sliding axis but rather at its end. This placement presents the following problems:

[0004] 1. The motor and eccentric wheel are concentrated at one end, causing the center of gravity of the entire moving part to deviate from the center along the axis. During high-speed reciprocating motion, a large unbalanced inertial force and torque will be generated, causing the whole machine to vibrate violently.

[0005] 2. Increased wear on one side: Power is input from one end, and the blade part closer to the motor may experience greater force and movement, resulting in uneven wear of the blade, affecting the trimming effect and shortening its service life.

[0006] 3. Uneven motor load and low energy efficiency: In order to overcome greater inertial forces and vibration resistance, the motor needs to output greater torque, which leads to increased energy consumption and may shorten battery life. Utility Model Content

[0007] The purpose of this utility model is to overcome the defects of the prior art. This utility model provides a hair trimming device with multiple sets of reciprocating blades that move synchronously, which can trim multiple areas at the same time, improving efficiency. The motor is set in the middle position, which has good balance and stability, and the trimming is smooth.

[0008] Technical solution of the utility model: A hair trimming device includes a housing, a reciprocating blade group, and a power source. The reciprocating blade group includes a stationary blade and a moving blade. The stationary blade and the moving blade are always kept in contact under the action of a torsion spring. A number of corresponding cutting edges are provided on both the stationary blade and the moving blade. The power source is arranged inside the housing and drives the moving blade to reciprocate relative to the stationary blade to achieve a cutting action when the power source works. Two sets of the reciprocating blade groups are provided and are respectively arranged on both sides of the power source. The power source is located on the central axis of the two moving blades. An eccentric shaft is provided on the power source. A transmission member is arranged inside the housing. The transmission member is connected to the eccentric shaft and swings inside the housing when the power source works. The transmission member is directly or indirectly connected to the moving blade to drive the two moving blades to reciprocate relative to the corresponding stationary blades.

[0009] Adopting the above technical solution, there is better balance and stability. When the motor drives in the center, the forces exerted by the eccentric shaft on the two sets of blades are more symmetrical, which can offset part of the inertial force, reduce the shaking of the whole machine, and make the trimming more stable; reduce vibration and noise. After the balance is improved, the mechanical vibration weakens, thereby reducing the running noise and enhancing the user experience; extend the service life of the blades and the motor. The reduced vibration means more uniform wear, and the load distribution of the blades and the motor bearings is more reasonable, which helps to reduce the failure rate; improve energy efficiency and response speed. The motor is directly located at the center point of power transmission, shortening the transmission path, with less energy loss, and more efficient start and reciprocating motion; the structure is more compact. The central layout may optimize the utilization of the internal space, making the design more lightweight and convenient for handheld operation.

[0010] Further setting of the utility model: The transmission member includes a transmission block and a transmission rod. The transmission rod is arranged in a V shape. The transmission block is located inside the transmission rod and is in contact with the transmission rod. One end of the transmission rod is hinged to the housing, and the other end of the transmission rod is connected to the corresponding moving blade. The transmission block swings under the rotational drive of the eccentric shaft to drive the two transmission rods to swing so that the moving blade reciprocates relative to the stationary blade.

[0011] Adopting the above further setting, the rotational motion of the eccentric shaft is skillfully converted into the reciprocating swing of the transmission rod through the swing of the transmission block, and then the moving blade is pushed. The motion conversion efficiency is high and the structure is reliable; the V-shaped design naturally ensures that the motion directions of the two transmission rods on both sides are always opposite, thus ensuring that the two moving blades on both sides can reciprocate and shear synchronously and symmetrically.

[0012] Another further setting of the utility model: The transmission block and the transmission rod are integrally formed and are arranged in a "one" shape. A limiting groove is provided on the transmission block. The end of the eccentric shaft is inserted into the limiting groove. When the power source works, the eccentric shaft slides along the limiting groove and pushes the transmission member to move through the wall of the limiting groove.

[0013] With the above-mentioned further design, the one-piece molding avoids loosening and wear at the connection points, has better overall rigidity, and is not prone to deformation or abnormal noise during long-term use; it also reduces the number of parts, lowers the assembly difficulty and production cost; the cooperation between the limiting groove and the eccentric shaft makes the transmission of rotational motion to swinging motion smoother, with less impact and smoother operation.

[0014] A further feature of this invention is as follows: the housing is provided with a stationary tool holder, both stationary tools are fixedly mounted on the stationary tool holder, and two moving tools are connected to a moving tool holder. The moving tool holder is provided with a connecting groove, and the transmission component is provided with a connecting shaft. The connecting shaft is inserted into the connecting groove so as to drive the moving tool holder to reciprocate when the transmission component swings.

[0015] By adopting the above-mentioned further configuration, the blade is fixed by the blade holder, which can better ensure the alignment and flatness of all blade edges, and ensure uniform cutting effect. The transmission component drives the moving blade holder to reciprocate through the connecting shaft, which in turn drives the moving blade on the moving blade holder to move synchronously.

[0016] A further feature of this invention is that the moving tool holder is provided with a plurality of connecting posts, and the moving tool is provided with corresponding connecting holes. The connecting posts are inserted into the connecting holes to achieve the installation and fixation of the moving tool and the moving tool holder.

[0017] With the above-mentioned further design, the connection structure is simple, easy to assemble and disassemble, and also facilitates the synchronous movement of the moving tool when the moving tool holder moves.

[0018] A further improvement of this utility model is that: both sides of the stationary knife holder are provided with connecting arms, the connecting arms are provided with threaded holes, the stationary knife is provided with through holes, the through holes and threaded holes are provided with screws to realize the installation and fixation of the stationary knife and the stationary knife holder.

[0019] With the above-mentioned further design, the screw connection provides strong locking force to ensure that the stationary blade will not loosen under high-speed vibration, while also retaining detachability for easy deep cleaning or replacement.

[0020] A further feature of this invention is as follows: a supporting crossbeam is provided on the housing, the stationary tool holder is fixed to the upper end face of the supporting crossbeam, the lower end face of the supporting crossbeam is provided with a mounting cavity, the helical part of the torsion spring is located in the mounting cavity, and the two ends of the torsion spring abut against the moving tool holder.

[0021] With the above-mentioned further design, the support beam serves as the core load-bearing structure, enhancing the rigidity of the housing and providing a stable working platform for the blade assembly. The torsion spring that provides the blade's contact force is cleverly built into the support beam, resulting in a compact structure that protects the spring from hair and dust, ensuring a long-lasting and stable contact force.

[0022] A further feature of this invention is that the housing is provided with two first mounting posts and a second mounting post located between the two first mounting posts. A limiting plate is fixedly mounted on the two first mounting posts, and a mounting shaft is provided on the second mounting post. A transmission rod is sleeved on the mounting shaft, and the limiting plate is located above the transmission rod.

[0023] With the above-mentioned further design, the mounting shaft provides a clear rotation fulcrum for the transmission rod, while the limiting plate prevents it from jumping upwards or coming off, thus constraining the transmission components to move only within the designed plane, ensuring reliable operation and low noise.

[0024] A further feature of this invention is that it includes a protective cover, which covers the reciprocating blade assembly and is detachably connected to the housing. The protective cover has a positioning groove, and the housing has a corresponding positioning protrusion. The positioning protrusion and the positioning groove cooperate to connect and fix the protective cover to the housing.

[0025] With the above-mentioned further design, the protective cover protects the reciprocating blade assembly. When the device is not in use, the protective cover covers the reciprocating blade assembly to prevent damage to the blades and also to prevent dust. The cooperation between the positioning protrusions and the positioning grooves allows for quick installation and removal of the protective cover and provides a clear "click" feel, allowing users to intuitively confirm whether the protective cover is installed in place, resulting in a better user experience. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a specific embodiment of the present utility model;

[0027] Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the transmission component and reciprocating blade assembly in a specific embodiment of this utility model;

[0029] Figure 4 This is a schematic diagram showing the connection between the transmission component and the moving tool holder in a specific embodiment of this utility model;

[0030] Figure 5 This is a schematic diagram of the transmission component and the moving blade in a specific embodiment of this utility model;

[0031] Figure 6 This is a schematic diagram of the moving blade in a specific embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the stationary knife and stationary knife holder according to a specific embodiment of the present utility model;

[0033] Figure 8 This is a schematic diagram showing the position of the supporting beam in a specific embodiment of this utility model;

[0034] Figure 9 This is a schematic diagram showing the connection between the transmission component and the limiting plate in a specific embodiment of this utility model;

[0035] Figure 10 This is a schematic diagram of the installation of the torsion spring according to a specific embodiment of the present utility model;

[0036] Figure 11 This is a schematic diagram of the protective cover according to a specific embodiment of the present utility model;

[0037] Figure 12 This is a schematic diagram of a motor according to a specific embodiment of the present utility model;

[0038] Figure 13 This is a schematic diagram of different cutting heads on the same bottom shell.

[0039] In the diagram, 1. Housing; 11. Support beam; 111. Mounting cavity; 12. First mounting post; 13. Second mounting post; 14. Limiting plate; 15. Positioning protrusion; 16. Circuit board; 17. Power supply; 2. Reciprocating blade assembly; 21. Stationary blade; 211. Through hole; 22. Moving blade; 221. Connecting hole; 3. Power source; 31. Eccentric shaft; 4. Torsion spring; 5. Transmission component; 51. Transmission block; 511. Limiting groove; 52. Transmission rod; 53. Connecting shaft; 6. Stationary blade holder; 61. Connecting arm; 611. Threaded hole; 7. Moving blade holder; 71. Connecting groove; 72. Connecting post; 8. Protective cover; 81. Positioning groove. Detailed Implementation

[0040] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] It should be noted that all directional indicators (such as up, down, forward, backward, etc.) in the description of this utility model are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0042] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0044] like Figure 1-13 As shown, a hair trimming device includes a housing 1, a reciprocating blade assembly 2, and a power source 3. The power source 3 is an electric motor. The reciprocating blade assembly 2 includes a stationary blade 21 and a moving blade 22, which are kept in contact under the action of a torsion spring 4. Each of the stationary blade 21 and the moving blade 22 has several corresponding cutting edges. The power source 3 is located inside the housing 1. When the power source 3 is working, it drives the moving blade 22 to reciprocate relative to the stationary blade 21 to achieve a cutting action. There are two sets of reciprocating blade assemblies 2, which are respectively located on both sides of the power source 3. The power source 3 is located on the central axis of the two moving blades 22. An eccentric shaft 31 is provided on the power source 3. A transmission component 5 is provided inside the housing 1. The transmission component 5 is connected to the eccentric shaft 31. When the power source 3 is working, the transmission component 5 swings inside the housing 1, transmitting power. Component 5 is directly or indirectly connected to the moving blade 22 to drive the two moving blades 22 to reciprocate relative to the corresponding stationary blade 21, resulting in better balance and stability. When the motor is driven in the center, the force applied by the eccentric shaft 31 to the two sets of blades is more symmetrical, which can offset some of the inertial force, reduce the shaking of the whole machine, and make trimming more stable; reduce vibration and noise. After the balance is improved, mechanical vibration is weakened, thereby reducing operating noise and improving the user experience; extend the life of blades and motors. Reduced vibration means more uniform wear, and the load distribution of blades and motor bearings is more reasonable, which helps to reduce the failure rate; improve energy efficiency and response speed. The motor is directly located at the center point of power transmission, shortening the transmission path, reducing energy loss, and making starting and reciprocating motion more efficient; and make the structure more compact. The central layout can optimize the use of internal space, making the design lighter and easier to operate by hand.

[0045] The transmission component 5 includes a transmission block 51 and a transmission rod 52. The transmission block 51 and the transmission rod 52 can be separate or integrally formed. When separate, they can be fixedly connected or simply abut against each other. This utility model preferably adopts an integrally formed design. The transmission rod 52 is V-shaped. The transmission block 51 is located inside the transmission rod 52 and abuts against it. One end of the transmission rod 52 is hinged to the housing 1, and the other end is connected to the corresponding moving blade 22. The transmission block 51 swings under the rotational drive of the eccentric shaft 31, driving the two transmission rods 52 to swing so that the moving blade 22 reciprocates relative to the stationary blade 21. The rotational motion of the eccentric shaft 31 is cleverly converted into the reciprocating swing of the transmission rod 52 through the swing of the transmission block 51, which then pushes the moving blade 22, thus achieving a motion conversion effect. High efficiency and reliable structure; the V-shaped design naturally ensures that the movement directions of the two transmission rods 52 are always opposite, thus ensuring that the two moving blades 22 can perform reciprocating shearing synchronously and symmetrically; the transmission block 51 is integrally formed with the transmission rod 52 and is arranged in a "U" shape. The transmission block 51 is provided with a limiting groove 511. The end of the eccentric shaft 31 is inserted into the limiting groove 511. When the power source 3 is working, the eccentric shaft 31 slides along the limiting groove and pushes the transmission component 5 to move through the wall of the limiting groove. The integral forming avoids loosening and wear at the connection, has better overall rigidity, and is not easy to deform or produce abnormal noise after long-term use; it also reduces the number of parts, reduces assembly difficulty and production cost; the cooperation between the limiting groove and the eccentric shaft 31 makes the transmission from rotational motion to oscillating motion smoother, with less impact and smoother operation.

[0046] The housing 1 is equipped with a stationary blade holder 21, and two stationary blades 21 are fixedly mounted on the stationary blade holder 21. Two moving blades 22 are connected to moving blade holders 22. The moving blade holders 22 are provided with connecting grooves 71. The transmission component 5 is provided with a connecting shaft 53, which is inserted into the connecting groove 71. This shaft 53 drives the moving blade holders 22 to reciprocate when the transmission component 5 swings. By fixing the blades with the blade holders, the alignment and flatness of all blade edges can be better ensured, guaranteeing a uniform cutting effect. The transmission component 5 drives the moving blade holders 22 to reciprocate via the connecting shafts 53, thereby driving the moving blades 22 on the moving blade holders to move synchronously. The moving blade holders 22 are provided with several connecting posts 72, corresponding to the moving blades 22. A connecting hole 221 is provided, and a connecting post 72 is inserted into the connecting hole 221 to realize the installation and fixation of the moving blade 22 and the moving blade 22 frame. The connection structure is simple, easy to disassemble and assemble, and also facilitates the synchronous movement of the moving blade 22 when the moving blade 22 frame moves. Both sides of the stationary blade 21 frame are provided with connecting arms 61, and the connecting arms 61 are provided with threaded holes 611. The stationary blade 21 is provided with through holes 211. The through holes 211 and the threaded holes 611 are correspondingly arranged and screws are passed through them to realize the installation and fixation of the stationary blade 21 and the stationary blade 21 frame. The screw connection provides a strong locking force to ensure that the stationary blade 21 will not loosen under high-speed vibration, while also retaining disassembly for easy deep cleaning or replacement.

[0047] The housing 1 is provided with a support beam 11. The stationary blade 21 is fixed to the upper end face of the support beam 11. The lower end face of the support beam 11 is provided with a mounting cavity 111. The helical part of the torsion spring 4 is located in the mounting cavity 111. The two ends of the torsion spring 4 abut against the moving blade 22. The support beam 11, as the core load-bearing structure, enhances the rigidity of the housing 1 and provides a stable working platform for the blade assembly. The torsion spring 4, which provides the blade contact force, is cleverly built into the support beam 11. The structure is compact, protects the spring from hair and dust interference, and ensures a long-lasting and stable contact force.

[0048] The housing 1 is provided with two first mounting posts 12 and a second mounting post 13 located between the two first mounting posts 12. A limiting plate 14 is fixedly installed on the two first mounting posts 12, and a mounting shaft is provided on the second mounting post 13. The transmission rod 52 is sleeved on the mounting shaft. The limiting plate 14 is located above the transmission rod 52. The mounting shaft provides a clear rotation fulcrum for the transmission rod 52, and the limiting plate 14 prevents it from jumping upward or falling out. It constrains the transmission component 5 to move only within the designed plane, which is reliable and has low noise.

[0049] It also includes a protective cover 8, which covers the reciprocating blade assembly 2 and is detachably connected to the housing 1. The protective cover 8 is provided with a positioning groove 81, and the housing 1 is provided with a corresponding positioning protrusion 15. The positioning protrusion 15 and the positioning groove 81 cooperate to connect and fix the protective cover 8 to the housing 1. The protective cover 8 protects the reciprocating blade assembly 2. When the device is not in use, the protective cover 8 covers the reciprocating blade assembly 2 to avoid damage to the blades and can also prevent dust. The cooperation between the positioning protrusion 15 and the positioning groove 81 can realize the quick installation and removal of the protective cover 8 and provide a clear "click" feel, allowing users to intuitively confirm whether the protective cover 8 is installed in place, providing a good experience.

[0050] The housing 1 includes a bottom shell, a middle frame, and a top cover. The bottom shell contains a circuit board 16 and a power supply 17. The power source 3 is also located inside the bottom shell. The circuit board 16 is connected to the power supply 17 and the power source 3. The circuit board 16 has a charging port and a switch. The bottom shell has a button to turn the drive switch on or off. The transmission component 5 is located on the middle frame. The stationary blade 21 is mounted on the top cover. The bottom shell and the middle frame can also be a base. Multiple sets of gears are located on the middle frame, one of which is connected to the power source 3. The top cover has a blade head and a blade net. Different hair trimming can be achieved by using the same base with different blade heads.

Claims

1. A hair trimming device, comprising a housing (1), a reciprocating blade assembly (2), and a power source (3), wherein the reciprocating blade assembly (2) comprises a stationary blade (21) and a moving blade (22), the stationary blade (21) and the moving blade (22) being kept in contact under the action of a torsion spring (4), and each of the stationary blade (21) and the moving blade (22) having a plurality of corresponding cutting edges, the power source (3) being disposed within the housing (1), and driving the moving blade (22) to reciprocate relative to the stationary blade (21) to achieve a cutting action when the power source (3) is working, characterized in that, There are two sets of the reciprocating blade groups (2), which are respectively arranged on both sides of the power source (3). The power source (3) is located on the central axis of the two moving blades (22). An eccentric shaft (31) is provided on the power source (3). A transmission member (5) is provided in the housing (1). The transmission member (5) is connected to the eccentric shaft (31), and when the power source (3) works, the transmission member (5) swings in the housing (1). The transmission member (5) is directly or indirectly connected to the moving blade (22) to drive the two moving blades (22) to reciprocate relative to the corresponding stationary blade (21).

2. The hair trimming device according to claim 1, characterized in that, The transmission member (5) includes a transmission block (51) and a transmission rod (52). The transmission rod (52) is arranged in a V shape. The transmission block (51) is located inside the transmission rod (52) and is in contact with the transmission rod (52). One end of the transmission rod (52) is hinged to the housing (1), and the other end of the transmission rod (52) is connected to the corresponding moving blade (22). The transmission block (51) swings under the rotational drive of the eccentric shaft (31) to drive the two transmission rods (52) to swing so that the moving blade (22) reciprocates relative to the stationary blade (21).

3. The hair trimming device according to claim 2, characterized in that, The transmission block (51) and the transmission rod (52) are integrally formed and are arranged in a "个" shape. A limiting groove is provided on the transmission block (51). The end of the eccentric shaft (31) is inserted into the limiting groove. When the power source (3) works, the eccentric shaft (31) slides along the limiting groove and pushes the transmission member (5) to move through the wall of the limiting groove.

4. The hair trimming device according to claim 1, 2, or 3, characterized in that, A stationary blade (21) holder is provided on the housing (1). The two stationary blades (21) are both fixedly installed on the stationary blade (21) holder. A moving blade (22) holder is connected to the two moving blades (22). A connecting groove (71) is provided on the moving blade (22) holder. A connecting shaft (53) is provided on the transmission member (5). The connecting shaft (53) is inserted into the connecting groove (71) to drive the moving blade (22) holder to reciprocate when the transmission member (5) swings.

5. The hair trimming device according to claim 4, characterized in that, A plurality of connecting columns (72) are provided on the moving blade (22) holder. Corresponding connecting holes (221) are provided on the moving blade (22). The connecting columns (72) are inserted into the connecting holes (221) to realize the installation and fixation of the moving blade (22) and the moving blade (22) holder.

6. The hair trimming device according to claim 4, characterized in that, Connecting arms (61) are provided on both sides of the stationary blade (21) holder. Threaded holes (611) are provided on the connecting arms (61). Through holes (211) are provided on the stationary blade (21). The through holes (211) and the threaded holes (611) are correspondingly arranged and are penetrated by screws to realize the installation and fixation of the stationary blade (21) and the stationary blade (21) holder.

7. The hair trimming device according to claim 4, characterized in that, A support cross beam (11) is provided on the housing (1). The stationary blade (21) holder is fixed to the upper end surface of the support cross beam (11). An installation cavity (111) is provided on the lower end surface of the support cross beam (11). The spiral part in the middle of the torsion spring (4) is located in the installation cavity (111). The two ends of the torsion spring (4) are in contact with the moving blade (22) holder.

8. The hair trimming device according to claim 3, characterized in that, The housing (1) is provided with two first mounting posts (12) and a second mounting post (13) located between the two first mounting posts (12). A limiting plate (14) is fixedly installed on the two first mounting posts (12). A mounting shaft is provided on the second mounting post (13). A transmission rod (52) is sleeved on the mounting shaft. The limiting plate (14) is located above the transmission rod (52).

9. The hair trimming device according to claim 1, 2, or 3, characterized in that, It also includes a protective cover (8), which covers the reciprocating blade assembly (2) and is detachably connected to the housing (1). The protective cover (8) is provided with a positioning groove (81), and the housing (1) is provided with a corresponding positioning protrusion (15). The positioning protrusion (15) and the positioning groove (81) cooperate to realize the connection and fixation between the protective cover (8) and the housing (1).

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