Reciprocating drive mechanism and hair clipper

Abstract

The present application relates to hair trimming device technical field, especially to a kind of reciprocating drive mechanism and hair clipper, including swing arm, swing arm is along the axial direction of motor and is located at one end of motor;Motor, eccentric shaft is installed on the output shaft of motor;Elastic support piece, between swing arm and motor;Transmission piece, between motor and swing arm, one end is rotatably connected with eccentric shaft, the other end is rotatably connected with swing arm, wherein, with the axial direction of motor along z axis direction is set, with swing arm reciprocating direction as x axis direction, x axis direction and z axis direction are perpendicular to each other, with the direction perpendicular to both simultaneously as y axis direction;Transmission piece is equipped with elastic deformation area, and elastic deformation area is configured as: the two ends of transmission piece can produce elastic relative displacement in z axis direction and / or y axis direction solves the problem that existing drive mechanism is relatively large when using wear and noise.

Description

Technical Field

[0001] This invention relates to the field of hair trimming equipment technology, and particularly to a reciprocating drive mechanism and hair clippers. Background Technology

[0002] In existing hair clippers (such as razors and hair shears), the drive mechanism often uses a direct sliding engagement between the eccentric shaft of an eccentric wheel and the transmission interface of the moving blade head to convert rotary motion into linear reciprocating motion. For example, Chinese patent application CN203460203U discloses a "reciprocating electric shaver" in which the eccentric shaft moves within a wedge-shaped groove of a swing rod, and the circular motion of the eccentric shaft drives the swing rod to reciprocate. The drawback of this solution is that the eccentric shaft and the wedge-shaped groove are in a sliding friction engagement, which results in significant wear under high-frequency reciprocating motion, and the operating noise generated by the sliding friction is also quite noticeable. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the present invention aims to provide a reciprocating drive mechanism and a hair clipper, which solves the problems of wear and relatively high noise in the use of existing drive mechanisms.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a reciprocating drive mechanism, comprising:

[0005] The swing arm is used to mount the moving cutter head. The swing arm is located at one end of the motor along the axial direction of the motor.

[0006] The motor has an eccentric shaft mounted on its output shaft, and the eccentric shaft is arranged parallel to the output shaft.

[0007] An elastic support plate is installed between the swing arm and the motor to provide the swing arm with an elastic restoring force along the x-axis.

[0008] The transmission plate is located between the motor and the swing arm. One end of the plate is rotatably connected to the eccentric shaft, and the other end is rotatably connected to the swing arm, so as to convert the circular motion of the eccentric shaft around the output shaft into the reciprocating linear motion of the swing arm along the x-axis.

[0009] Among them, the motor axis is set along the z-axis direction, the reciprocating motion direction of the swing arm is the x-axis direction, the x-axis direction and the z-axis direction are perpendicular to each other, and the direction that is perpendicular to both is the y-axis direction;

[0010] The transmission plate is provided with an elastic deformation zone, which is configured to allow the two ends of the transmission plate to generate elastic relative displacement in the z-axis direction and / or y-axis direction.

[0011] Furthermore, the elastic deformation zone includes a thickness reduction section disposed on the transmission plate, through which the transmission plate elastically bends in the z-axis direction and / or y-axis direction.

[0012] By adopting the above technical solution, the elastic deformation zone is achieved through a thickness reduction section on the transmission plate. Local thinning allows the transmission plate to elastically bend in the z-axis and / or y-axis directions. The thickness reduction section is simple to manufacture, requiring no additional parts or material changes. It achieves flexible deformation capability in a specific direction while ensuring the structural strength of the main transmission plate, resulting in low manufacturing costs.

[0013] Furthermore, the elastic modulus of the elastic deformation zone is lower than that of other parts of the transmission plate.

[0014] By adopting the above technical solution, the elastic modulus of the elastic deformation zone is lower than that of other parts of the transmission plate. This material difference makes the transmission plate more prone to elastic deformation in specific areas. This solution allows for a consistent overall thickness of the transmission plate, resulting in a more regular appearance. Furthermore, the material properties of the elastic deformation zone can be independently selected as needed, offering greater design flexibility.

[0015] Furthermore, the transmission plate includes an inner arm and an outer arm spaced apart along the y-axis. One end of the outer arm is bent to connect with one end of the inner arm, the other end of the outer arm is rotatably connected to the swing arm, and the other end of the inner arm is rotatably connected to the eccentric shaft.

[0016] By adopting the above technical solution, the structure drives the swing arm to reciprocate through the inner and outer arms of the eccentric shaft's rotational motion. The transmission path is clear and the structure has good stability. The inner and outer arms are set at intervals along the y-axis, so that the plane of the entire transmission plate is parallel to the axial end face of the motor, reducing the volume of the product after assembly. In addition, the inner and outer arms provide an installation path for the formation of the subsequent elastic deformation zone, and the structural layout is reasonable.

[0017] Furthermore, the transmission plate is thin, with its thickness direction corresponding to the z-axis direction, so that the inner arm has elastic deformation force in the z-axis direction.

[0018] By adopting the above technical solution, the transmission plate is thin and its thickness direction corresponds to the z-axis direction, so that the transmission plate has elastic deformation force in the z-axis direction. It can effectively absorb the position deviation of the two ends of the rotating connection point in the motor axis caused by assembly tolerance. The thin plate structure is simple and does not require thinning grooves to be opened on the transmission plate. The elastic deformation in the z-axis direction can be achieved by utilizing the low bending stiffness of the thin plate itself. It is easy to process and has good structural reliability.

[0019] Furthermore, there is at least one transmission plate, and when multiple transmission plates are set, they are stacked along the z-axis.

[0020] By adopting the above technical solution, multiple transmission plates can be set, and the multiple transmission plates are stacked along the z-axis direction. While ensuring their elastic deformation capability in the z-axis direction, the transmission plates can also maintain rigidity in the x-axis and y-axis directions, thus ensuring the stability of the transmission path.

[0021] Furthermore, the elastic deformation zone includes a first thinning section on the outer arm with reduced thickness along the y-axis direction, and a second thinning section on the inner arm with reduced thickness along the z-axis direction.

[0022] By adopting the above technical solution, the elastic deformation zone includes a first thinning section on the outer arm with reduced thickness along the y-axis direction, and a second thinning section on the inner arm with reduced thickness along the z-axis direction. The first thinning section makes the outer arm elastic in the y-axis direction to absorb the impact component in the x-axis direction when the swing arm reverses direction. The second thinning section makes the inner arm elastic in the z-axis direction to absorb the assembly deviation in the axial direction of the motor. The two thinning sections are respectively set on different arm bodies, each solving the elastic deformation requirements in different directions. The functions are clearly divided and do not interfere with each other.

[0023] Furthermore, the transmission plate is a linear plate structure, with its two ends rotatably connected to the eccentric shaft and the swing arm, respectively. Its thickness direction corresponds to the z-axis direction, so that the transmission plate has elastic deformation force in the z-axis.

[0024] By adopting the above technical solution, the transmission plate is a linear sheet structure with its two ends rotatably connected to the eccentric shaft and the swing arm, respectively. Its thickness direction corresponds to the z-axis direction, so that the transmission plate has elastic deformation force in the z-axis direction. The linear sheet structure is the simplest to process and can be formed in one step by stamping or injection molding, resulting in low manufacturing cost and making it suitable for cost-sensitive product solutions.

[0025] Furthermore, the transmission plate and the eccentric shaft, as well as the transmission plate and the swing arm, are rotatably connected by bearings. The swing arm is equipped with a connecting shaft, which is rotatably connected to the bearings, so that the swing arm and the transmission plate are rotatably connected.

[0026] By adopting the above technical solution, the transmission plate and the eccentric shaft, as well as the transmission plate and the swing arm, are rotatably connected by bearings. The swing arm is provided with a connecting shaft, which passes through the pin hole and is fixedly connected to the inner ring of the bearing. This realizes a smooth rotatable connection between the transmission plate and the swing arm. The bearing connection reduces rotational friction, improves transmission efficiency, and extends the service life of the rotatable connection points at both ends of the transmission plate.

[0027] Furthermore, a motor frame is provided on the outside of the motor, and the lower end of the elastic support plate is connected to the motor frame, while its upper end is installed at the end of the swing arm to provide elastic restoring force along the x-axis for the swing arm.

[0028] By adopting the above technical solution, the elastic support plate provides the swing arm with an elastic restoring force along the x-axis, enabling the swing arm to reciprocate smoothly under the drive of the transmission plate. At the same time, it provides an auxiliary restoring force when the swing arm reverses direction, reducing the motor load. The motor frame provides a stable mounting base for the elastic support plate, improving the connection reliability of the elastic support plate.

[0029] Furthermore, the side of the swing arm is equipped with a mounting base, and an elastic buffer is provided between the mounting base and the motor frame.

[0030] By adopting the above technical solution, a mounting base is provided on the side of the swing arm, and an elastic buffer is provided between the mounting base and the motor frame. When the swing arm moves to its limit position, the elastic buffer absorbs the commutation impact energy, reducing the vibration and noise of the swing arm during commutation, and at the same time assisting the swing arm to reset, further reducing the motor load. The mounting base provides positioning support for the elastic buffer, ensuring that the force direction of the elastic buffer is consistent with the movement direction of the swing arm, resulting in the best buffering effect.

[0031] A type of hair clipper, including the aforementioned reciprocating drive mechanism.

[0032] By adopting the above technical solution, the drive mechanism is applied to the reciprocating hair clipper. The elastic deformation zone on the transmission plate absorbs assembly deviations and reversing impacts, which significantly reduces the operating noise and vibration of the hair clipper, improves the user's grip, and extends the product's service life.

[0033] Compared with the prior art, the advantages of the present invention are as follows:

[0034] This application sets an independent transmission plate between the eccentric shaft and the swing arm. One end of the transmission plate is rotatably connected to the eccentric shaft, and the other end is rotatably connected to the swing arm. When the eccentric shaft moves in a circular motion around the output shaft, the transmission plate converts the circular motion of the eccentric shaft into the reciprocating linear motion of the swing arm along the x-axis. Both ends of the transmission plate are rotatably connected, which transforms the sliding friction between the eccentric shaft and the wedge groove in the traditional solution into a rotational fit. This fundamentally solves the problems of high wear and noise caused by sliding friction. As an independent intermediate transmission component, the transmission plate decouples the rotational motion of the eccentric shaft from the reciprocating motion of the swing arm. The eccentric shaft does not need to directly contact the swing arm, avoiding the direct friction between the eccentric shaft and the groove arm in the traditional solution, and significantly extending the service life of the transmission mechanism.

[0035] In addition, this application places the swing arm along the axial direction of the motor at one end of the motor, and the transmission plate is placed between the motor and the swing arm, so that the motor, transmission plate and swing arm are arranged in sequence along the axial direction of the motor to form a coaxial layout, which significantly reduces the radial dimension of the entire drive mechanism and makes the structure more compact. It is especially suitable for reciprocating hair clipper products with limited internal space. The transmission path is transmitted in a straight line without radial diversion, and the transmission efficiency is higher.

[0036] In addition, the transmission plate is provided with an elastic deformation zone, which allows its two ends to generate elastic relative displacement in the z-axis direction (motor axis) and / or the y-axis direction (width direction), covering three implementation possibilities: elastic deformation only in the z-axis direction, only in the y-axis direction, or elastic deformation in both directions:

[0037] The elastic deformation in the z-axis direction is used to solve assembly tolerance problems: The eccentric shaft is installed on the motor output shaft. One end of the transmission plate is rotatably connected to the eccentric shaft, and the other end is rotatably connected to the swing arm. After multiple levels of assembly tolerance at the two rotating connection points, the two connection points will have a positional deviation in the motor axis. When the transmission plate has elastic deformation capability in the z-axis direction, it can absorb the axial deviation through its own elastic deformation, so that the two rotating connection points are not affected by axial stress, rotate normally, and avoid jamming and noise.

[0038] The elastic deformation in the y-axis direction is used to solve the problem of reversing impact: When the eccentric shaft moves in a circular motion around the output shaft and drives the swing arm to reciprocate along the x-axis through the transmission plate, when the swing arm moves to the limit position of the reciprocating stroke in the x-direction, the direction of motion of the eccentric shaft is about to reverse. At this time, the transmission plate needs to apply a reverse pulling force to the swing arm to reverse its direction. Since the swing arm and the moving cutter head mounted on it have a certain motion inertia, at the moment of reversal, the inertial force will generate an impact load on the rotating connection at both ends of the transmission plate, causing vibration and noise. Long-term operation will also accelerate the wear of the rotating connection and shorten the service life. At this time, the elastic deformation of the transmission plate in the y-axis direction can reduce the impact wear at this point, thereby reducing noise and improving product life.

[0039] When elastic deformation exists simultaneously in both the z-axis and y-axis directions, they work together—the z-axis direction absorbs assembly deviations, and the y-axis direction absorbs directional impacts. This fundamentally breaks the vicious cycle of "assembly deviation—impact amplification—wear aggravation," effectively reducing product vibration and noise, and improving the user experience of the hair clippers. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the reciprocating drive mechanism of the present invention.

[0041] Figure 2 This is an exploded view of the reciprocating drive mechanism of the present invention.

[0042] Figure 3 This is a schematic diagram of the transmission plate structure of the present invention (the transmission plate is in the form of a thin sheet).

[0043] Figure 4 This is a schematic diagram of the transmission plate structure of the present invention (first embodiment of the transmission plate).

[0044] Figure 5 This is a schematic diagram of the transmission plate structure of the present invention (Figure a corresponds to the third embodiment; Figure b corresponds to the second embodiment).

[0045] Figure 6 This is an exploded view of the reciprocating drive mechanism of the present invention.

[0046] Figure 7 This is a schematic diagram of the structure of the hair clippers of the present invention.

[0047] In the picture:

[0048] 1. Motor, 11. Motor frame, 12. Rotor, 13. Output shaft, 14. Eccentric shaft, 15. Stator coil.

[0049] 2. Transmission plate, 20. Elastic deformation zone, 201. First thinning section, 202. Second thinning section, 21. Inner arm, 22. Outer arm, 23. Bearing, 231. First bearing, 232. Second bearing, 233. Fixing ring, 234. Bearing sleeve, 234a. End, 234b. Rod, 25. Bearing hole.

[0050] 3 swing arm, 31 drive head, 32 mounting base.

[0051] 4. Support springs, 41. Pins.

[0052] 51 Fixed blade head, 52 Moving blade head, 53 Connecting port, 54 Hair clipper shell.

[0053] 6. Elastic buffer. Detailed Implementation

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0055] Reference Figure 1-7 A reciprocating drive, commonly used in hair clipper products such as reciprocating hair clippers and reciprocating shavers, includes a motor 1, a swing arm 3, a support spring 4, and a transmission plate 2. The motor 1 has a stator coil 15, a rotor 12, and an output shaft 13. An eccentric shaft 14 is mounted on the output shaft 13, and the eccentric shaft 14 is arranged parallel to the output shaft 13. The swing arm 3 is located at one end of the motor 1 along the axial direction of the motor 1. The transmission plate 2 is located between the motor 1 and the swing arm 3, with one end rotatably connected to the eccentric shaft 14 and the other end rotatably connected to the swing arm 3. When the motor 1 drives the eccentric shaft 14 to perform circular motion around the output shaft 13, the transmission plate 2 converts the circular motion of the eccentric shaft 14 into the reciprocating linear motion of the swing arm 3 along the x-axis.

[0056] In this embodiment, the specific type of motor 1 can be an internal rotor motor, an external rotor motor, or other types of rotary actuators, as long as they can drive the eccentric shaft 14 to generate circular motion around the output shaft of the motor 1.

[0057] For ease of description, refer to Figure 1 Taking the reciprocating motion direction of the swing arm 3 as the x-axis, the axis of the motor 1 as the z-axis, and the direction perpendicular to both as the y-axis, that is, referring to... Figure 1 In the diagram, the x-axis corresponds to the length direction of the drive mechanism, the y-axis corresponds to the width direction of the drive mechanism, and the z-axis corresponds to the height direction of the drive mechanism.

[0058] Reference Figure 1 and2 The support spring 4 is installed between the swing arm 3 and the motor 1, and is located on both sides of the motor 1 along the x-axis. Its upper end is connected to the end of the swing arm 3, and its lower end is connected to the motor housing 11 of the motor 1. The support spring 4 has a sheet-like structure, and its material can be metal, plastic or other components with elastic deformation force. Its thickness is relatively thin along the x-axis direction, while its size is relatively wide in the other two directions, so that the support spring 4 can only provide elastic support force to the swing arm 3 along the x-axis direction.

[0059] In some specific embodiments, the transmission plate 2 is provided with an elastic deformation region 20, which is configured to allow the two ends of the transmission plate 2 to generate elastic relative displacement in the z-axis direction and / or y-axis direction.

[0060] The elastic deformation region 20 can be achieved in several ways:

[0061] like Figure 1 , 2 In the first implementation, the transmission plate 2 can utilize the elastic bending of the thin plate itself in the thickness direction:

[0062] In this method, the transmission plate 2 is a thin sheet with its thickness direction corresponding to the z-axis direction. The entire transmission plate 2 is located in the plane formed by the x-axis and y-axis directions. The transmission plate 2 itself is a thin sheet with a small thickness along the z-axis direction. According to the principles of material mechanics, the bending stiffness of the thin sheet along its thickness direction (z-axis direction) is significantly lower than its bending stiffness in the in-plane direction (x-axis and y-axis directions). Therefore, the transmission plate 2 has a natural elastic bending ability in the z-axis direction. Without setting a thinning section or using different materials, the elastic deformation in the z-axis direction can be achieved by utilizing the structural characteristics of the thin sheet itself. At the same time, the transmission plate 2 maintains rigidity in the x-axis and y-axis directions. This method is easy to process, has good structural reliability, and can achieve bending in the z-axis direction.

[0063] like Figure 4 and Figure 5 As shown in Figure a, in this embodiment, as a second implementation, the transmission plate 2 has a certain basic thickness, and a thickness reduction section is set in a specific area of ​​it. The thickness of the thickness reduction section is less than that of the adjacent part of the transmission plate 2. By locally reducing the thickness, the transmission plate 2 can generate elastic bending in the corresponding direction (z-axis direction and / or y-axis direction). The direction and position of the thinning section can be flexibly set according to the required elastic deformation direction. This method is simple to process and does not require adding parts or changing materials. Under the premise of ensuring the strength of the main structure of the transmission plate 2, it realizes the flexible deformation capability in a specific direction.

[0064] like Figure 5As shown in Figure b, as a third implementation method, in this method, the transmission plate 2 is made of a material with a lower elastic modulus than other parts in a specific area. For example, the transmission plate 2 can be formed by two-color injection molding or insert injection molding process. The elastic deformation zone 20 uses a material with a lower elastic modulus (such as soft plastic, rubber, etc.), while other parts use a rigid material with a higher elastic modulus (such as hard plastic, metal, etc.). This method makes the overall thickness of the transmission plate 2 consistent, the appearance more regular, and the material properties of the elastic deformation zone 20 can be selected independently as needed, with higher design flexibility.

[0065] like Figure 2 and Figure 3 As shown, the rotational connection between the transmission plate 2 and the eccentric shaft 14, and between the transmission plate 2 and the swing arm 3, can both be achieved through the bearing 23. Specifically, the bearing 23 includes a first bearing 231 and a second bearing 232. The transmission plate 2 and the eccentric shaft 14 are rotatably connected through the first bearing 231, and the transmission plate 2 and the swing arm 3 are rotatably connected through the second bearing 232. The swing arm 3 is provided with a pin 41, and the inner ring of the second bearing 232 is fitted onto the pin 41. The transmission plate 2 is provided with bearing holes corresponding to the positions of the pin 41 and the eccentric shaft 14. The bearing 23 also includes a bearing sleeve 234 and a fixing ring 223. The bearing sleeve 234 is T-shaped and hollow inside, and includes an end 234a and a rod portion 234b provided on the end 234a. In this embodiment, the specific installation method of the bearing 23 is explained using the rotation of the eccentric shaft 14 with the transmission plate 2 via the first bearing 231 as an example.

[0066] During installation, the eccentric shaft 14 is preferably inserted through the entire interior of the bearing housing 234. The bearing housing 234 passes through the bearing hole 25 at one end of the transmission plate 4 via the rod 234b and extends to the upper end face of the transmission plate 4. At this time, the first bearing 231 is located between the bearing hole 25 and the eccentric shaft 14. Then, the first bearing 231 is clamped to the outside of the first bearing 231 by the retaining ring 233. The transmission plate 2 and the eccentric shaft 14 are rotatably connected by the limiting effect of the retaining ring 233 and the end 234a. Similarly, the pin 41 and the transmission plate 2 can also be connected by the bearing sleeve 234 as described above.

[0067] Regarding the first embodiment of the transmission plate: (inner and outer arm structure, using thinned sections to achieve bidirectional elasticity)

[0068] like Figure 4 As shown, in a preferred embodiment, the transmission plate 2 includes an inner arm 21 and an outer arm 22 spaced apart along the y-axis. One end of the outer arm 22 is bent to connect with one end of the inner arm 21. The other end of the outer arm 22 is rotatably connected to the swing arm 3 via a pin 41 and a bearing 23. The other end of the inner arm 21 is rotatably connected to the eccentric shaft 14. The transmission path is: eccentric shaft 14 → inner arm 21 → outer arm 22 → swing arm 3.

[0069] In this embodiment, the elastic deformation zone 20 is implemented in a second way (thickness reduction section), including a second thinning section 202 on the outer arm 22 with thickness reduction along the y-axis direction, and a first thinning section 201 on the inner arm 21 with thickness reduction along the z-axis direction. The second thinning section 202 enables the outer arm 22 to have elastic bending capability in the y-axis direction, which is used to absorb the impact component generated when the swing arm 3 reverses direction. The first thinning section 201 enables the inner arm 21 to have elastic bending capability in the z-axis direction, which is used to absorb the assembly deviation in the axial direction of the motor. The two thinning sections are respectively provided on different arm bodies, each solving the elastic deformation requirements in different directions. The functions are clearly divided and do not interfere with each other.

[0070] Alternatively, the first thinning section 201 and / or the second thinning section 202 can also be implemented using a third method (a material with a lower elastic modulus), that is, using a material with a lower elastic modulus in the corresponding regions of the outer arm 22 and / or the inner arm 21 to achieve the same elastic deformation capability in the corresponding direction.

[0071] As shown in Figure 3, in another alternative embodiment, the transmission plate 2 is a thin sheet with its thickness direction corresponding to the z-axis direction. The transmission plate 2 is a thin sheet as a whole, without the need to set a thinning section or use different materials. The elastic deformation in the z-axis direction can be achieved by utilizing the low bending stiffness of the thin sheet itself in the thickness direction (z-axis direction), while the x-axis and y-axis directions remain rigid. In this embodiment, the transmission plate 2 can still adopt the structure of inner arm 21 and outer arm 22. At this time, both inner arm 21 and outer arm 22 are thin along the z-axis direction, and can be elastically bent in the z-axis direction, but cannot be bent in other directions.

[0072] Furthermore, such as Figure 3 As shown, in a preferred embodiment, multiple transmission plates 2 can be provided, and the multiple transmission plates 2 are stacked along the z-axis direction. The multi-layer stacking ensures that the transmission plates 2 can maintain rigidity in the x-axis and y-axis directions while ensuring their elastic deformation capability in the z-axis direction, thus ensuring the stability of the transmission path.

[0073] Regarding the second embodiment of transmission plate 2:

[0074] like Figure 5 As shown in Figure b, in another alternative embodiment, the transmission plate 2 is a linear sheet structure, with its two ends rotatably connected to the eccentric shaft 14 and the swing arm 3, respectively. The thickness direction of the transmission plate 2 corresponds to the z-axis direction. The linear sheet transmission plate 2 is a thin sheet, which utilizes the low bending stiffness of the sheet itself in the thickness direction to achieve elastic deformation in the z-axis direction, while maintaining rigidity in the x-axis and y-axis directions. The linear sheet structure is the simplest to process and can be formed in one step by stamping or injection molding, resulting in low manufacturing cost.

[0075] Alternatively, the linear sheet-like transmission plate 2, when having a certain thickness, can also be provided with a thickness reduction section (the second way of the elastic deformation zone) to realize the function of the elastic deformation zone 20, so that the transmission plate 2 can generate elastic bending in the z-axis direction and / or y-axis direction.

[0076] The third embodiment regarding the transmission plate:

[0077] like Figure 5 As shown in Figure b, in another alternative embodiment, the transmission plate is similar to the scheme of the first embodiment. In the first embodiment, the outer arm 22 is provided on the upper and lower sides of the inner arm 21, while in this embodiment, only one inner arm 21 and one outer arm 22 are provided. The corresponding arrangement of the elastic deformation zone 20 can also adopt the second method (setting a thinning section) and / or the third method (using materials with different elastic moduli).

[0078] Based on the above embodiments, such as Figure 1 and Figure 2 As shown, the side of the swing arm 3 is provided with a mounting base 32, and an elastic buffer 6 is provided between the mounting base 32 and the motor frame 11. When the swing arm 3 moves to the limit position, the elastic buffer 6 absorbs the commutation impact energy, reduces the vibration and noise of the swing arm 3 during commutation, and assists the swing arm 3 to reset, further reducing the load on the motor 1.

[0079] The specific elastic buffer 6 can be made of elastic materials such as damping springs or compression springs. As long as it can buffer the swing arm 3 during reciprocating motion, it can also be other elastic components.

[0080] like Figure 7 As shown, this embodiment provides a hair clipper, including a reciprocating drive mechanism and a hair clipper housing 54 as described in any of the above embodiments. The hair clipper housing 54 is provided with a fixed blade head 51, and a movable blade head 52 is provided on the side of the fixed blade head 51. A drive head 31 is installed on the swing arm 3. The drive head 31 and the movable blade head 52 are connected through a connection port 53. When the swing arm 3 reciprocates, it drives the movable blade head 52 to reciprocate relative to the fixed blade head 51, thereby achieving hair trimming.

[0081] The following is combined Figures 1 to 7 The complete working process of the reciprocating drive mechanism of the present invention will be comprehensively described.

[0082] After the motor 1 is powered on, the rotor 12 rotates under the magnetic field of the stator coil 15, driving the output shaft 13 to rotate. The eccentric shaft 14 rotates synchronously with the output shaft 13, making circular motion around the axis of the output shaft 13. The circular motion of the eccentric shaft 14 is transmitted to the swing arm 3 through the transmission plate 2, so that the swing arm 3 generates reciprocating linear motion. The swing arm 3 is equipped with a drive head 31, which is installed in the connection port 53 inside the moving cutter head 52. The swing arm 3 drives the drive head 31 to reciprocate. The drive head 31 drives the moving cutter head 52 to reciprocate relative to the fixed cutter head 51 through the connection port 53, realizing hair trimming. During the transmission process, the elastic deformation zone 20 on the transmission plate 2 plays a role in vibration reduction and noise reduction in the z-axis direction. Since the eccentric shaft 14 is mounted on the output shaft 13, the rotor 12, stator coil 15 and output shaft 13 inside the motor 1 have manufacturing tolerances, and the installation of the swing arm 3 also has dimensional tolerances. After these tolerances accumulate, the axial position of the rotating connection points at both ends of the transmission plate 2 will be deviated in the z-axis direction. The transmission plate 2 absorbs the axial assembly deviation in the z-axis direction through the elastic deformation of the first thinning section 201 on the inner arm 21 (or the z-axis elasticity of the thin plate itself, or a low elastic modulus material), so that the bearings 23 at both ends can rotate normally without axial stress, avoiding jamming and noise.

[0083] In the y-axis direction, when the swing arm 3 moves to the limit position of the reciprocating stroke along the x-axis direction, the movement direction of the eccentric shaft 14 is about to reverse. The transmission plate 2 needs to apply a reverse pulling force to the swing arm 3 to change its direction. Since the swing arm 3 and the moving cutter head 52 mounted on it have a certain motion inertia, at the moment of reversal, the inertial force will generate an impact load on the rotating connection at both ends of the transmission plate 2. The transmission plate 2 absorbs the impact energy in the y-axis direction through the elastic deformation of the second thinning section 202 on the outer arm 22 (or other y-axis elastic implementation method), reducing impact wear, protecting the bearing from rigid impact, reducing vibration and operating noise, and extending service life.

[0084] When elastic deformation exists simultaneously in both the z-axis and y-axis directions, they work synergistically—absorbing assembly deviations in the z-axis direction and absorbing reversing impacts in the y-axis direction. This fundamentally breaks the vicious cycle of "assembly deviation—impact amplification—intensified wear," effectively reducing product vibration and noise during operation and improving the user experience of the hair clippers. Meanwhile, the support spring 4 provides elastic restoring force along the x-axis to the swing arm 3, assisting in reversing and restoring the swing arm 3, reducing the load on the motor 1. The elastic buffer absorbs impact energy at the extreme positions of the swing arm 3, further reducing vibration.

[0085] Although preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A reciprocating drive mechanism, comprising: A swing arm is used to mount the moving cutter head, and the swing arm is located at one end of the motor along the axial direction of the motor; An electric motor, wherein an eccentric shaft is mounted on its output shaft, and the eccentric shaft is arranged parallel to the output shaft; An elastic support plate is installed between the swing arm and the motor to provide the swing arm with an elastic restoring force along the x-axis direction; A transmission plate is disposed between the motor and the swing arm. One end of the plate is rotatably connected to the eccentric shaft, and the other end is rotatably connected to the swing arm, so as to convert the circular motion of the eccentric shaft around the output shaft into the reciprocating linear motion of the swing arm along the x-axis. The motor is set along the z-axis, the reciprocating motion direction of the swing arm is the x-axis, the x-axis and z-axis are perpendicular to each other, and the direction that is perpendicular to both is the y-axis. The transmission plate is provided with an elastic deformation zone, which is configured such that the two ends of the transmission plate can generate elastic relative displacement in the z-axis direction and / or y-axis direction.

2. The reciprocating drive mechanism according to claim 1, characterized in that, The elastic deformation zone includes a thickness reduction section disposed on the transmission plate, through which the transmission plate elastically bends in the z-axis direction and / or y-axis direction.

3. The reciprocating drive mechanism according to claim 1, characterized in that, The elastic modulus of the elastic deformation zone is lower than that of other parts of the transmission plate.

4. The reciprocating drive mechanism according to claim 1, characterized in that, The transmission plate includes an inner arm and an outer arm spaced apart along the y-axis. One end of the outer arm is bent to connect with one end of the inner arm, and the other end of the outer arm is rotatably connected to the swing arm. The other end of the inner arm is rotatably connected to the eccentric shaft.

5. A reciprocating drive mechanism according to claim 4, characterized in that, The transmission plate is thin and its thickness direction corresponds to the z-axis direction, so that the inner arm has an elastic deformation force in the z-axis direction.

6. A reciprocating drive mechanism according to claim 5, characterized in that, The transmission plate is at least one, and when multiple transmission plates are provided, the multiple transmission plates are stacked along the z-axis direction.

7. A reciprocating drive mechanism according to claim 4, characterized in that, The elastic deformation zone includes a first thinning section on the outer arm with reduced thickness along the y-axis direction, and a second thinning section on the inner arm with reduced thickness along the z-axis direction.

8. A reciprocating drive mechanism according to claim 1, characterized in that, The transmission plate is a linear sheet structure, with its two ends rotatably connected to the eccentric shaft and the swing arm, respectively. Its thickness direction corresponds to the z-axis direction, so that the transmission plate has elastic deformation force in the z-axis.

9. A reciprocating drive mechanism according to any one of claims 1-8, characterized in that, The transmission plate and the eccentric shaft, as well as the transmission plate and the swing arm, are rotatably connected by bearings. The swing arm is provided with a connecting shaft, which is rotatably connected to the bearing, so that the swing arm and the transmission plate are rotatably connected.

10. A reciprocating drive mechanism according to claim 1, characterized in that, The motor is provided with a motor frame on the outside. The lower end of the elastic support plate is connected to the motor frame, and its upper end is installed at the end of the swing arm to provide the swing arm with an elastic restoring force along the x-axis.

11. A reciprocating drive mechanism according to claim 10, characterized in that, The side of the swing arm is provided with a mounting base, and an elastic buffer is provided between the mounting base and the motor frame.

12. A type of hair clipper, characterized in that, It includes the reciprocating drive mechanism of any one of claims 9, 10, and 11.

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