Linear transmission mechanism and hair clipper

Abstract

The present application relates to the technical field of hair cutter, particularly relates to a linear transmission mechanism and hair cutter, comprising a motor, an eccentric shaft is arranged on the output shaft of the motor, a swing arm is arranged on the eccentric shaft, a movable cutter head is connected to the swing arm, a sheet-shaped elastomer is connected to the movable cutter head, the sheet-shaped elastomer is rotationally connected with the eccentric shaft, and the swing arm and the sheet-shaped elastomer are connected, the sheet-shaped elastomer is configured to have elastic deformation capacity in the thickness direction, and has rigidity in the length and width directions, so that the circular motion of the eccentric shaft is converted into the reciprocating linear motion of the swing arm in a single direction, and the problems of short product life and large noise of the existing cutter head traditional transmission mechanism are solved.

Description

Technical Field

[0001] This invention relates to the field of hair clipper technology, and in particular to a linear transmission mechanism and a hair clipper. Background Technology

[0002] Reciprocating razors and hair clippers, such as razors and electric hair clippers, are used for trimming hair or beards and are widely used in daily life.

[0003] Traditional transmission mechanisms in reciprocating shavers and hair clippers typically use a friction mechanism between an eccentric wheel axle and a plastic transmission interface to convert the motor's rotational motion into the linear reciprocating motion of the shaver head. This method has inherent drawbacks: firstly, the friction pair is prone to wear, leading to a short product lifespan, noise, and uncontrolled vibration; secondly, the friction process consumes energy and generates heat, further affecting reliability. Therefore, there is an urgent need for a new linear transmission solution that is low-wear, low-noise, highly efficient, and highly integrated. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the purpose of this invention is to provide a linear transmission mechanism that solves the problems of short product life and high noise in existing traditional transmission mechanisms for cutter heads.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a linear transmission mechanism, comprising:

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

[0007] The swing arm is used to connect the moving cutter head;

[0008] A sheet-like elastomer is rotatably connected to an eccentric shaft and to a swing arm;

[0009] The sheet-like elastomer is configured to have elastic deformation capability in its thickness direction and rigidity in its length and width directions, thereby converting the circular motion of the eccentric shaft into the reciprocating linear motion of the swing arm in a single direction.

[0010] Furthermore, it also includes an elastic reset element, which is connected between the swing arm and the motor housing to provide an elastic reset force after the swing arm is displaced.

[0011] By adopting the above technical solution and setting the elastic reset component, a stable and reliable elastic restoring force and support force are provided for the swing arm that completes the reciprocating motion, ensuring that the moving head can accurately and quickly reset after each cutting stroke. This not only improves the regularity and consistency of the cutting action, but also effectively suppresses the residual vibration that may be generated at the end of the swing arm, thereby further improving the uniformity of shaving or haircutting results and the comfort of use.

[0012] Furthermore, the elastic reset member includes a first elastic body disposed between the outer side of the swing arm and the motor housing and / or a second elastic body disposed between the inner side of the swing arm and the motor housing.

[0013] By adopting the above technical solution, either the first elastic body or the second elastic body can be set separately to provide effective support and elastic restoring force for the swing arm. When the first elastic body and the second elastic body are set at the same time, the elastic restoring component can effectively improve the support and restoring of the swing arm, while further improving the absorption and processing capacity of the swing arm due to inertia. This makes the vibration suppression effect of the entire hair clipper better when the swing arm is driven by the sheet elastic body, and greatly improves the user experience.

[0014] Furthermore, the first elastic body is a sheet-like structure with its thickness direction facing the reciprocating motion direction of the swing arm, and it has elastic deformation capability only in the thickness direction.

[0015] By adopting the above technical solution, a thin sheet structure with the same directional deformation characteristics is used, which is easy to deform in the direction of movement to provide a restoring force, while maintaining rigidity in other directions to provide support, thus realizing the integration of the restoring and support functions and the high compactness of the structure.

[0016] Furthermore, the second elastomer is an elastic element with damping properties, used to eliminate the inertial vibration of the swing arm.

[0017] By adopting the above technical solution and using components with damping characteristics (such as damping springs and elastic rubber), not only can a restoring force be provided, but the inertial vibration energy generated by the swing arm during high-speed start-stop can also be effectively dissipated, thereby significantly reducing noise and improving operational stability, while also enhancing the support effect on the swing arm.

[0018] Furthermore, the sheet-like elastomer is composed of multiple layers stacked together.

[0019] By adopting the above technical solutions, the multi-layer stacked structure maintains the bendability of a single layer while significantly improving the overall stiffness and strength in the non-deformation direction, making the transmission more direct and efficient, dispersing alternating stress, and improving fatigue life and overall reliability.

[0020] Furthermore, the sheet-like elastomers are spaced apart along the thickness direction.

[0021] By adopting the above technical solution and setting intervals, while ensuring that the sheet elastomer can bend normally in its thickness direction, the rigidity and strength of the sheet elastomer in the non-swing arm movement direction can be effectively improved, making the transmission more direct and efficient, dispersing alternating stress, and improving fatigue life and overall reliability.

[0022] Furthermore, a bearing housing is rotatably connected to the outside of the eccentric shaft, and one end of the sheet-like elastomer is rotatably connected to the eccentric shaft through the bearing housing.

[0023] By adopting the above technical solution, sliding friction is converted into rolling friction through the bearing housing, which greatly reduces the frictional resistance, wear and heat generation between the eccentric shaft and the sheet elastomer, and significantly improves transmission efficiency, service life and noise reduction.

[0024] Furthermore, a magnetic preload is provided between the bearing housing and the motor to maintain the sheet elastomer in a preload orientation toward the motor.

[0025] By adopting the above technical solution, a magnetic preload is installed between the bearing housing and the motor housing to generate a continuous attractive force along the motor axis. This preload force ensures that the sheet-like elastomer is always subjected to a slight pulling force towards the motor during transmission, thereby eliminating the small gaps that may exist in the connection links, effectively suppressing axial sway during transmission, making power transmission tighter and more direct, and further reducing noise and vibration.

[0026] Furthermore, the sheet elastomer has a linear sheet structure, and the swing arm is provided with mounting feet extending toward the sheet elastomer.

[0027] By adopting the above technical solutions, the linear structure has the advantages of the most direct force transmission path, the simplest structure, and the lowest manufacturing cost.

[0028] The sheet-like elastomer has at least one bent portion.

[0029] By adopting the above technical solutions, the bending part can optimize the spatial configuration, achieve a longer effective deformation length in a limited space, improve elasticity and life, and guide and disperse stress through a specific shape to adapt to complex layouts. At the same time, the bending part also facilitates the bending of sheet elastomers in the thickness direction.

[0030] Furthermore, the bending portion is configured to bend in the horizontal plane where the motor axis is located, and the swing arm is provided with mounting feet extending toward the sheet-like elastomer to facilitate the connection between the sheet-like elastomer and the eccentric shaft.

[0031] By adopting the above technical solution, the bending in the axial plane can efficiently "direct" the rotational motion of the motor end face to the outer swing arm, realizing the spatial folding of the transmission path. This is particularly beneficial for constructing a compact horizontal motor setup. At the same time, by adding the bending part, it is more conducive to the elastic bending of the sheet-like elastomer in the vertical direction of the swing arm's movement, thereby limiting the movement direction of the swing arm to linear motion.

[0032] Furthermore, the bent portion is radially bent toward the motor, and includes a connected horizontal plane and a vertical plane, with the horizontal plane arranged parallel to the swing arm and the vertical plane arranged perpendicular to the swing arm.

[0033] By adopting the above technical solution, the structural design achieves a more stable transmission of the swing arm when the motor is driven.

[0034] Furthermore, at least one swing arm is provided and is located radially outside the motor.

[0035] By adopting the above technical solution, the swing arm is set on the radial outside of the motor, forming an intuitive and efficient transmission path. Power is output from the motor shaft end and directly drives the swing arm on the side through the eccentric shaft and the elastic body, forming a single-blade hair clipper product with one eccentric shaft driving one swing arm.

[0036] Furthermore, the eccentric shaft is located at one end of the motor's axial direction, and there are two swing arms. Either swing arm is connected to the eccentric shaft via a sheet-like elastic body. Adjacent swing arms are linked together through connecting rods to achieve synchronous movement between adjacent swing arms.

[0037] By adopting the above technical solution, the linkage synchronization scheme of single motor driving double swing arms can synchronously drive two swing arms with only one eccentric shaft and one linkage mechanism, realizing a revolutionary design of controlling double cutter heads with one power source. This greatly simplifies the internal structure of double cutter head products, reduces the number of parts, assembly processes and costs, and lays a mechanical foundation for obtaining high-precision motion synchronization.

[0038] Furthermore, the middle part of the connecting rod is rotatably mounted via a positioning shaft, and both ends are movably connected to two swing arms, so that when one swing arm moves, it drives the other swing arm to move synchronously in the opposite direction.

[0039] By adopting the above technical solution, a single linkage enables the reciprocating inertial forces generated by two or more moving cutter heads to cancel each other out macroscopically during operation of a swing arm. This fundamentally and significantly reduces the vibration and noise of the entire product during operation, providing users with an unprecedentedly smooth and quiet user experience.

[0040] Furthermore, two swing arms are fixedly connected to both ends of the connecting rod so that the two swing arms move synchronously in the same direction.

[0041] By adopting the above technical solution, this mode expands the application scenarios of the present invention, enabling the two moving cutters to move in the same direction and cooperate like "double pistons", demonstrating the functional flexibility and configurability of the transmission mechanism of the present invention.

[0042] Furthermore, there are two swing arms, with eccentric shafts located at both ends of the motor's axial direction. The two eccentric shafts are respectively connected to the corresponding swing arms via sheet-like elastic bodies.

[0043] By adopting the above technical solution, and by independently setting eccentric shafts at both ends of the motor to drive two swing arms respectively, a dual-head motor is used to provide an independent, powerful and precisely controllable power source for each cutter head. The transmission is smooth, and the two swing arms are driven by only the characteristic of the dual-head motor itself having two output shafts. This effectively simplifies the product structure and achieves the hair trimming effect of dual cutters.

[0044] Furthermore, the two eccentric shafts are symmetrically arranged with the motor axis as the axis of symmetry.

[0045] By adopting the above technical solution, the two eccentric shafts are symmetrically arranged about the motor axis, so that the centrifugal forces generated when they rotate cancel each other out in the radial direction. This achieves excellent dynamic balance from the power source, which can revolutionarily reduce the overall vibration of the motor when running at high speed and the noise transmitted to the housing. It is a decisive feature that enhances the high-end quality of the product.

[0046] Furthermore, the eccentric shaft is externally rotatably connected to a bearing housing, with sheet-like elastomers located on both sides of the bearing housing. The adjacent ends of the two sheet-like elastomers are rotatably connected to the eccentric shaft through the bearing housing, while the other end is fixed to the swing arm.

[0047] By adopting the above technical solution, a stable "double clamping" transmission structure is formed by using a bearing housing and symmetrically arranging sheet-like elastomers on both sides. This symmetrical force distribution makes the application point of the driving force more balanced, improves the transmission stability of the motor driving the moving cutter head through the sheet-like elastomers, and ensures the independence and high stability of each swing arm movement under dual-axis drive.

[0048] Furthermore, at least two sets of sheet elastomers are provided on one side of the bearing housing, and multiple sets of sheet elastomers are arranged at vertical intervals, with each set containing at least one sheet elastomer.

[0049] By adopting the above technical solution, multiple sets of vertically spaced sheet-like elastomers are used on one side. While ensuring that the sheet-like elastomers can bend normally, the elastic sheet maintains rigidity and strength in the non-bending direction, making the transmission more direct and efficient. It also disperses alternating stress, improves fatigue life and overall reliability, and enhances the reliability of the system. Furthermore, the synergy of multiple sets can better suppress vibrations under complex working conditions.

[0050] Furthermore, the end of the swing arm is provided with a mounting foot extending toward the sheet-like elastomer, and an elastic reset member is provided between the motor housing and the swing arm. The elastic reset member includes a first elastomer located at the end of the swing arm and the motor housing, and a second elastomer located between the mounting foot and the motor housing.

[0051] By adopting the above technical solution, either the first elastic body or the second elastic body can be set separately to provide effective support and elastic restoring force for the swing arm. When the first elastic body and the second elastic body are set at the same time, the elastic restoring component can effectively improve the support and restoring of the swing arm, while further improving the absorption and processing capacity of the swing arm due to inertia. This makes the vibration suppression effect of the entire hair clipper better when the swing arm is driven by the sheet elastic body, greatly improving the user experience.

[0052] Furthermore, the swing arm is located along the axis of the motor, and there is at least one swing arm.

[0053] By adopting the above technical solution, this claim defines another basic layout that is completely different from the horizontal layout—the vertical layout, which sets the swing arm on the axial direction (end) of the motor, changing the transmission direction. This layout provides a brand-new design possibility and structural basis for realizing a shaver with compact axial dimensions and a novel and unique shape.

[0054] Furthermore, there are two swing arms, and the eccentric shaft connects either swing arm through a sheet-like elastic body. Adjacent swing arms are linked by a connecting rod to achieve synchronous movement between adjacent swing arms.

[0055] By adopting the above technical solution, two cutter heads can be synchronously driven by a single motor through a linkage mechanism within the limited axial space of the vertical structure. This inherits all the advantages of the solution in saving space, reducing costs, and achieving anti-vibration reduction, while also meeting the special internal layout requirements of the vertical product form.

[0056] Furthermore, the swing arm is provided with two parts, and the eccentric shaft includes a primary shaft protrusion on the output shaft and a secondary shaft protrusion at the end of the primary shaft protrusion. The primary shaft protrusion and the secondary shaft protrusion are respectively connected to the two swing arms through a sheet-like elastomer.

[0057] By adopting the above technical solution and using a series-connected double-stage eccentric shaft structure, only one output shaft of the motor is needed to mechanically generate two drive points with a specific phase relationship, thereby independently driving the two swing arms. This is a highly creative and space-efficient solution for achieving high-performance vertical double-blade drive.

[0058] Furthermore, the primary and secondary shaft protrusions are parallel and symmetrically arranged with the output shaft as the line of symmetry, or the primary and secondary shaft protrusions are linearly arranged.

[0059] By adopting the above technical solutions, the parallel symmetrical arrangement allows the two swing arms to move in opposite directions, achieving inertial force cancellation and vibration reduction; the linear arrangement allows the two swing arms to move in the same direction, achieving coordinated propulsion. This makes it possible to derive different functional products based on the same core mechanical structure by changing the processing technology, greatly improving design flexibility.

[0060] Furthermore, the sheet-like elastomer is disposed on one or both sides of the eccentric shaft.

[0061] By adopting the above technical solutions, the single-sided arrangement structure is the most compact and suitable for occasions with extremely limited space; the double-sided arrangement forms symmetrical force, the transmission is more stable, and the resistance to eccentric load is stronger, making it suitable for high loads or applications with extremely high requirements for motion stability. This provides a clear and legitimate choice for optimizing the design for different product positioning.

[0062] Furthermore, a bearing housing is rotatably fitted around the outer circumference of the eccentric shaft, and the bearing housing is rotatably connected to the sheet-like elastomer.

[0063] By adopting the above technical solution and connecting via bearing housing, this optimized feature can reduce frictional losses in the rotational connection between the eccentric shaft and the sheet-like elastomer, thereby reducing operating noise.

[0064] Furthermore, a magnetic preload is provided between the bearing housing and the motor to maintain the sheet elastomer in a preload orientation toward the motor.

[0065] By adopting the above technical solution, on the basis of reducing friction through the bearing housing, the axial gap that may exist in the entire transmission chain (from the bearing housing to the sheet elastomer) is further actively eliminated by magnetic pre-tightening, thereby making the power transmission more compact and direct, significantly reducing the impact noise, vibration and energy loss caused by the gap, and is suitable for various embodiments with stringent requirements for transmission accuracy and quietness.

[0066] Furthermore, the sheet elastomer has a linear sheet structure, or the sheet elastomer has at least one bend.

[0067] By adopting the above technical solution, this embodiment aims to provide a general choice regarding the form of the core transmission component for a series of specific embodiments covered by claims 13-27. It states that in these specific product architectures, designers can freely choose the form of an "linear" or "bent" elastomer as needed.

[0068] Furthermore, the swing arm is provided with a connecting bracket for connecting the moving cutter head. The connecting bracket has a mounting head for connecting the moving cutter head and a bracket for connecting the mounting head to the swing arm.

[0069] By adopting the above technical solution, the connecting frame, as a specialized adapter structure, realizes a standardized and modular connection between the transmission component (swing arm) and the execution component (moving cutter head). This facilitates the quick replacement, maintenance, or upgrade of the moving cutter head. At the same time, its support structure can be designed to enhance the local rigidity of the connection part, adjust the cutter head angle, or realize other auxiliary functions, thereby improving the standardization and maintainability of the overall design.

[0070] Furthermore, there are two swing arms, with the two supports staggered in the reciprocating motion direction of the swing arms, and a clearance cavity is formed at the staggered point to allow the swing arms to reciprocate.

[0071] By adopting the above technical solution, when two staggered brackets are set up and a clearance cavity is reserved, the mechanical interference problem that may occur in the high-speed reciprocating motion of two independent motion units can be perfectly solved in an extremely limited space. This ensures the reliability and safety of the high-density double-head layout, reduces the gap between the two swing arms, and makes the two swing arms relatively more stable during operation.

[0072] A hair clipper, characterized in that it includes a housing, a moving blade head, a fixed blade head, and the aforementioned linear transmission mechanism, wherein the hair clipper includes a razor or electric clippers.

[0073] A hair clipper, characterized in that it includes a housing, a moving blade head, a fixed blade head, and the aforementioned linear transmission mechanism, a drive rod is provided on the swing arm, an assembly hole is provided on the moving blade head, and the end of the drive rod away from the moving blade head is correspondingly installed in the assembly hole by adopting the above technical solution.

[0074] By adopting the above technical solution, this solution does not use a connecting frame as a transmission component between the swing arm and the moving cutter head. Instead, it adopts a traditional connection method between the drive rod and the moving cutter head. In this method, when one swing arm is set, its drive rod is connected between the swing arm and the moving cutter head. When two swing arms are set, it can be set on either swing arm, thereby achieving the effect of driving a single moving cutter head with two swing arms, such as the commonly used reciprocating electric clippers.

[0075] Compared with the prior art, the advantages of the present invention are as follows:

[0076] In this invention, a sheet-like elastomer with directional deformation characteristics is creatively introduced as a transmission element. Its elastic deformation in the thickness direction is used to absorb and filter out the component perpendicular to the swing arm's motion direction in the eccentric shaft's circumferential motion, while its rigidity in other directions is used to transmit the linear motion in the desired direction. This achieves frictionless, purely elastic coupling transmission, completely eliminating the wear interface from a physical principle perspective. This eradicates core failure problems such as short lifespan, loss of precision, and soaring noise caused by wear, and theoretically can extend the lifespan of transmission components by several orders of magnitude.

[0077] In this invention, power is transmitted through the elastic deformation and recovery of a sheet-like elastomer, resulting in extremely low energy loss and achieving near-lossless energy transfer. This not only significantly improves the energy efficiency of the motor and extends battery life, but also reduces heat generation, avoiding material aging and performance degradation caused by heat accumulation. At the same time, the elastic coupling transmission eliminates the lag caused by dry friction, making the movement of the cutting head more direct and rapid in response to the motor input, thus improving the dynamic performance of the control.

[0078] In contrast to traditional mechanisms where the motor, transmission components, and support structure are mostly installed separately, resulting in large cumulative tolerances and significant space occupation, the transmission principle of this invention features an extremely simple structure with fewer parts. This creates conditions for integrating the motor, eccentric shaft, elastic body, and swing arm into a compact, high-precision transmission module, improving the product's space utilization and laying a solid foundation for miniaturized and lightweight product design. Attached Figure Description

[0079] Figure 1 This is a schematic diagram of the linear drive mechanism of the present invention (motor mounted horizontally).

[0080] Figure 2 This is a schematic diagram of the linear drive mechanism of the present invention (motor mounted horizontally).

[0081] Figure 3 This is a schematic diagram of the linear drive mechanism of the present invention (motor mounted horizontally).

[0082] Figure 4 For the present invention Figure 1 Top view of the connection of the middle link to the swing arm.

[0083] Figure 5 For the present invention Figure 1 Top view of the connection of the middle link to the swing arm.

[0084] Figure 6 This is a schematic diagram of the rotor magnet and output shaft of the present invention.

[0085] Figure 7 This is a schematic diagram of the first spring structure of the present invention.

[0086] Figure 8 This is a schematic diagram of the first spring structure of the present invention.

[0087] Figure 9 This is a schematic diagram of the second spring structure of the present invention.

[0088] Figure 10 This is a schematic diagram of the linear drive mechanism structure of the present invention (motor mounted vertically).

[0089] Figure 11 This is a schematic diagram of the linear drive mechanism structure of the present invention (motor mounted vertically).

[0090] Figure 12 This is a schematic diagram of the linear drive mechanism structure of the present invention (motor mounted vertically).

[0091] Figure 13 This is a schematic diagram of the eccentric shaft structure of the present invention.

[0092] Figure 14This is a schematic diagram of the motor structure of the present invention.

[0093] Figure 15 This is a schematic diagram of the shaver of the present invention.

[0094] Figure 16 This is a schematic diagram of the razor structure of the present invention.

[0095] Figure 17 For the present invention Figure 1 A side sectional view of the structure.

[0096] Figure 18 This is a schematic diagram of the electric clipper structure of the present invention.

[0097] In the picture:

[0098] 1 Motor, 11 Housing, 111 First Housing, 112 Second Housing, 12 Coil, 13 Rotor Magnet, 14 Output Shaft, 15 Eccentric Shaft, 151 Primary Shaft Cam, 152 Secondary Shaft Cam, 153 Wheel Body.

[0099] 2 swing arms, 21 mounting feet.

[0100] 3 sheet-like elastomer, 31 first elastic piece, 311 bending part, 32 second elastic piece.

[0101] 4-link, 41-slider, 42-slide groove, 43-positioning shaft.

[0102] 5. Bearing housing, 51. Bearing, 52. Mounting lug, 53. Primary bearing housing, 54. Secondary bearing housing.

[0103] 6. Elastic reset element, 61. First elastic body, 62. Second elastic body

[0104] 7. Machine housing, 71. Moving cutter head, 72. Fixed cutter head.

[0105] 8 connecting brackets, 81 mounting heads, 82 brackets.

[0106] 9 drive levers. Detailed Implementation

[0107] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0108] like Figures 1 to 3 As shown, common hair clippers include electric clippers and razors. This embodiment provides a linear transmission mechanism, which is mainly used to drive the moving head 71 of the hair clipper to reciprocate linearly on one side of the fixed head 72, thereby achieving the effect of hair cutting or shaving.

[0109] Please refer to Figure 1-3The linear transmission mechanism mainly includes a motor 1, a swing arm 2, and a sheet-like elastic body 3. The moving blade 71 of the hair clipper is usually mounted on the swing arm 2 so that it moves with the linear motion of the swing arm 2. The sheet-like elastic body 3 has a thin sheet-like structure, which has elastic deformation capability in its thickness direction and rigidity in its length and width directions. Utilizing this characteristic, the circular motion of the eccentric shaft 15 can be converted into the linear motion of the swing arm 2. During operation, the output shaft 14 drives the eccentric shaft 15 to make circular motion around its axis. In the plane formed by this circular motion, the motion can be decomposed into two mutually perpendicular directions (e.g., Figure 1 The X and Y directions of the motion shown are shown, with the thickness direction corresponding to the Y direction. When the elasticity of the sheet-like elastomer 3 in the Y direction allows it to absorb and cancel the displacement component of the eccentric shaft 15 in the Y direction through its own deformation, its high rigidity in the X direction (i.e., its length, which is also the required direction of motion of the swing arm 2) allows the displacement component of the eccentric shaft 15 in the X direction to be transmitted to the swing arm 2 with almost no loss and rigidity. Finally, the circular motion of the eccentric shaft 15 is converted into the precise reciprocating linear motion of the swing arm 2 along the X direction.

[0110] In this embodiment, the sheet-like elastomer 3 can be made of elastic plastic, metal, or other materials. It innovatively introduces a sheet-like elastomer 3 with directional deformation characteristics as a transmission element. It uses its elastic deformation in the thickness direction to absorb and filter out the component perpendicular to the movement direction of the swing arm 2 in the circumferential motion of the eccentric shaft 15, and uses its rigidity in other directions to transmit the linear motion in the required direction. This realizes a frictionless pure elastic coupling transmission, which completely eliminates the wear interface from a physical principle, thereby eliminating the core failure problems such as short life, loss of precision, and noise surge caused by wear. Theoretically, it can extend the life of the transmission component by several orders of magnitude.

[0111] For ease of description, let's take a hair clipper as a cuboid. The vertical direction of the hair clipper corresponds to its height, the horizontal direction corresponds to its width, and the front-back direction corresponds to its back direction.

[0112] In this embodiment, to provide stable and reliable elastic restoring force and support force for the swing arm 2 to complete the reciprocating motion, and to improve the ability of the moving cutter head 71 to accurately and quickly reset after each cutting stroke, an elastic reset member 6 is also provided between the swing arm 2 and the housing 11 of the motor 1. Specifically, the elastic reset member 6 includes a first elastic body 61 disposed between the outer side of the swing arm 2 and the housing 11 of the motor 1 and / or a second elastic body 62 disposed between the inner side of the swing arm 2 and the housing 11 of the motor 1. The first elastic body 61 and the second elastic body 62 can be disposed separately between the swing arm 2 and the housing 11 of the motor 1, or they can be disposed in combination. The following describes different configurations.

[0113] Reference Figure 1In the first embodiment of the first elastic body 61, the elastic reset member 6 is in the shape of a thin sheet structure. Its working principle is the same as that of the sheet elastic body 3. It utilizes the advantage that the material has the characteristic of being able to bend elastically in the thin sheet direction, while it has no bending characteristics in other directions. The elastic reset sheet is placed between the housing 11 of the motor 1 and the end of the swing arm 2. The thickness direction of the elastic reset member 6 corresponds to the movement direction of the swing arm 2. In this way, when the swing arm 2 reciprocates under the drive of the sheet elastic body 3, the elastic reset member 6 elastically deforms, thereby providing elastic reset force and support force for the swing arm 2.

[0114] Specifically, in a first embodiment of the sheet-like first elastic body 61, its shape can be a regular sheet structure, such as a rectangle, triangle, pentagon, or other shapes. In this embodiment, a regular rectangular structure is preferred.

[0115] As a second embodiment of the sheet-like first elastomer 61, refer to Figure 1 The thin, elastic reset member 6 can also be irregular in shape, such as being wide at the top and bottom and narrow in the middle. The advantage of this design is that by utilizing the narrower width of the middle part, the elastic reset member 6 can be enhanced to improve the elastic deformation capability of the middle part, so as to facilitate the elastic deformation of the elastic reset member 6 and thus provide an effective elastic reset force for the swing arm 2.

[0116] As a third embodiment of the sheet-like first elastomer 61, see [reference] Figure 2 As shown, its elastic restoring member 6 may also have multiple bends in its width direction, thereby utilizing its bends to enhance the bending deformation capability of the first elastic body 61, and thus provide an effective elastic restoring force for the swing arm 2.

[0117] Based on the above embodiments, when the first elastic body 61 is a sheet-like structure, its shape can be regular or irregular. As long as it can provide support force and elastic restoring force to the swing arm 2, it can also be a sheet-like structure of other shapes.

[0118] As a second embodiment of the first elastic body 61, its shape can also be non-sheet-like. For example, it can be a spring, compression spring, compressible elastic rubber or other elastic body. Taking a spring as an example, the spring is placed between the swing arm 2 and the hair clipper housing 7. Its elastic extension and contraction direction is the same as the linear movement direction of the swing arm 2, which can also play the above-mentioned supporting and elastic restoring effect on the swing arm 2.

[0119] As a specific embodiment of the second elastic body 62, it adopts a damping element, which is located between the bottom of the swing arm 2 and the housing 11 of the motor 1. It can be a spring, compression spring, elastic metal sheet, elastic rubber or other elastically stretchable parts or structures. Its main function is to provide elastic restoring force after the swing arm 2 moves, and at the same time, it can effectively dissipate the inertial vibration energy generated by the swing arm 2 during high-speed start and stop, thereby significantly reducing noise and improving running stability.

[0120] When the first elastic body 61 and the second elastic body 62 are provided together, refer to Figure 3 This allows the swing arm 2 to be simultaneously guided by precise elasticity on the outside and damped by viscous resistance on the inside during its movement. This makes the movement of the swing arm 2 not only "accurate" (accurate reset) but also "smooth" (smooth process), further enhancing the swing arm 2's ability to rebound oscillate or fail to reset properly.

[0121] In this embodiment, 1-x, the sheet-like elastomer 3 can be a single-layer sheet structure or a multi-layer stack, such as two layers. As long as the sheet-like elastomer 3 can effectively absorb the component motion of the eccentric shaft 15 through elastic deformation in the thickness direction, it can also be other stacked layers.

[0122] Based on the above embodiments, referring to Figure 3 Its sheet-like elastomer 3 can be spaced apart in the thickness direction, such as Figure 3 As shown, the sheet-like elastomer 3 is formed by stacking two layers, and there are two sets in the thickness direction. The above-mentioned increase in the number of stacked layers of sheet-like elastomer 3 and the spacing have the following advantages: while ensuring that the sheet-like elastomer 3 can bend normally in the thickness direction, it can effectively improve the rigidity and strength of the sheet-like elastomer in the direction of the swing arm 2, avoid deformation of the sheet-like elastomer 3 in the movement direction of the swing arm 2, make the transmission more direct and efficient, disperse the alternating stress, and improve the fatigue life and overall reliability.

[0123] In this embodiment, refer to Figure 1-3 In order to reduce the frictional loss of the rotational connection between the sheet-like elastomer 3 and the eccentric shaft 15 and make the relative rotation of the two smoother, a bearing seat 5 is provided between the eccentric shaft 15 and the sheet-like elastomer 3 to reduce the rotational friction between the two.

[0124] Specifically, the bearing housing 5 contains the bearing, the eccentric shaft 15 is inserted into the inner ring of the bearing, and the sheet-like elastomer 3 is fixed to the outside of the bearing housing 5 by means of bolts, clips or interference fits. This completely converts sliding friction into rolling friction, greatly reducing wear and transmission resistance.

[0125] Preferably, as a connection method between the bearing housing 5 and the sheet elastomer 3, a mounting ear 52 can be provided on the outside of the bearing housing 5, and then one end of the sheet elastomer 3 can be connected to the mounting ear 52 by means of bolts, clips or other fixing methods, thereby realizing a detachable connection between the bearing housing 5 and the sheet elastomer 3.

[0126] In this embodiment, the mounting ear 52 and the bearing seat 5 are preferably integrally formed, but a detachable structure can also be used.

[0127] In this embodiment, in order to reduce the wear caused by the direct rotational connection between the eccentric shaft 15 and the sheet-like elastomer 3, a corresponding component is added between the two. In addition to the bearing seat 5, other components can also be added, which will not be described in detail here. The following embodiments all take the setting of the bearing seat 5 between the eccentric shaft 15 and the sheet-like elastomer 3 as an example to illustrate each embodiment.

[0128] Furthermore, in order to eliminate any possible minute gaps in the connecting links, effectively suppress axial wobble during transmission, make power transmission more compact and direct, and further reduce noise and vibration, a magnetic preload is installed between the bearing housing 5 and the housing 11 of the motor 1. This allows the sheet-like elastomer 3 to maintain a preload force towards the motor 1. The magnetic preload generates a continuous attraction along the axial direction of the motor 1, ensuring that the sheet-like elastomer 3 is always subjected to a slight tension towards the motor 1 during transmission. This eliminates any possible minute gaps in the connecting links and effectively suppresses axial wobble during transmission.

[0129] Based on the above embodiments, as a specific structure of the sheet elastomer 3, it can be a linear sheet structure or have a bending portion 311 thereon. The linear sheet structure is the simplest, the force transmission path is the most direct, and the manufacturing cost is relatively low. The sheet elastomer 3 with the bending portion 311 can optimize the spatial configuration by utilizing its bending portion 311, achieve a longer effective deformation length in a limited space, improve elasticity and life, and can guide and disperse stress through a specific shape to adapt to complex layouts. At the same time, the bending portion 311 also facilitates the bending of the sheet elastomer 3 in the thickness direction.

[0130] Based on the above embodiments, regarding the specific arrangement of the linear transmission mechanism, since it is located inside the hair clipper, and most hair clippers are close to a cuboid shape, such as common electric clippers and shavers, for ease of description, the following will use a cuboid hair clipper as an example:

[0131] Example 1: (Single eccentric shaft 15 + single swing arm 2)

[0132] In this embodiment, the axial direction of motor 1 is oriented towards the width direction of the hair clipper. This motor 1 configuration can be referred to as horizontal installation. In this case, motor 1 is a single-head motor 1. A swing arm 2 is provided and located at the radial upper end of motor 1. An eccentric shaft 15 is provided on the output shaft 14 at one end of motor 1. One end of the sheet-like elastic body 3 is rotatably connected to the eccentric shaft 15 via a bearing seat 5, and the other end is fixedly connected to the swing arm 2. The thickness direction of the sheet-like elastic body 3 corresponds to the height direction of the hair clipper (height direction, such as...). Figure 1 (In the Y-axis direction), when the motor 1 drives the output shaft 14 to rotate, it drives the eccentric shaft 15 to make a circular motion around the input shaft. Since the sheet elastic body 3 can bend elastically in its thickness direction, the motion of the eccentric shaft 15 in the height direction of the hair clipper is elastically resolved by the sheet elastic body 3. When the swing arm 2 moves in the circular motion, it will not drive the swing arm 2 to move up and down through the sheet elastic body 3. However, the motion in the left and right direction of the length direction of the hair clipper (i.e., the x-axis direction) is transmitted to the swing arm 2 through the sheet elastic body 3, thereby driving the swing arm 2 to reciprocate linearly around the left and right direction of the hair clipper, realizing the linear reciprocating swing of the swing arm 2.

[0133] Example 2: (Single eccentric shaft 15 + connecting rod 4 + double swing arm 2)

[0134] The above embodiment 1 is a movement mode in which an eccentric shaft 15 drives a swing arm 2. In this embodiment, there are two swing arms 2. In order to enable one eccentric shaft 15 to drive the two swing arms 2 to move synchronously, a connecting rod 4 is provided between the two swing arms 2, and the synchronous movement of the two swing arms 2 is achieved through the connecting rod 4.

[0135] Specifically, the synchronous movement of the two swing arms 2 via link 4 is divided into two operating modes: synchronous same-direction movement or synchronous opposite-direction movement. Taking synchronous opposite-direction movement as an example, refer to... Figure 4 The middle part of the connecting rod 4 is rotatably connected to the housing 11 of the motor 1 through the positioning shaft 43, and its two ends are rotatably connected to the two swing arms 2 respectively. In this way, when one swing arm 2 moves, it can drive the other swing arm 2 to move around the rotation axis, thereby causing the two swing arms 2 to move synchronously in opposite directions.

[0136] Furthermore, when the linear reciprocating displacement distance of the swing arm 2 is large, in order to improve the linearity of the synchronous opposite movement of the two swing arms 2, a guide limiting structure is provided between the swing arm 2 and the connecting rod 4. By setting the guide limiting structure, the circular motion of the two swing arms 2 around the positioning axis 43 can be limited to linear motion in a single direction. Specifically, the guide limiting structure includes a slide groove 42 and a sliding member 41 slidably disposed in the slide groove 42. The slide groove 42 is opened near the end of the connecting rod 4, and its setting direction is along the Z-axis direction, which is perpendicular to the movement direction (X-axis direction) of the swing arm 2. The sliding member 41 is fixed on the swing arm 2 and can only slide along the slide groove 42. In this way, by using the setting of the slide groove 42, the displacement of the two swing arms 2 along the frame along the Z-axis direction can be canceled by the sliding member 41 sliding in the slide groove 42, so that the two swing arms 2 can only slide linearly in the left and right directions along the X-axis direction.

[0137] It is conceivable that the slide groove 42 could also be set on the swing arm 2, and the sliding member 41 could be set at the corresponding position of the connecting rod 4 to achieve the same effect.

[0138] To achieve synchronous and unidirectional movement of link 4: Specifically, both ends of link 4 are fixedly connected to two swing arms 2, so that when one swing arm 2 moves, it can also drive the two swing arms 2 to move synchronously and in the same direction.

[0139] Based on the above embodiments, as long as the circular motion of the two swing arms 2 around the positioning axis 43 can be limited to the linear motion of the swing arms 2, the guide and limiting structure can also adopt the above-mentioned sheet-like elastomer 3. That is, the thickness direction of the sheet-like elastomer 3 faces the front and rear positions of the frame, while the width direction is parallel to the left and right directions of the frame. In this way, the displacement between the swing arms 2 and the connecting rod 4 in the front and rear directions can be solved by the elastic deformation of the sheet-like elastomer 3. Since the sheet-like elastomer 3 cannot deform in the left and right directions of the frame, it is possible to realize that when one swing arm 2 is in motion, it drives the other swing arm 2 to move linearly along the left and right sides of the frame through the connecting rod 4 and the sheet-like elastomer 3.

[0140] Of course, it is conceivable that the guide and limit mechanism can also be composed of other components. As long as it can make the two swing arms 2 maintain linear motion during transmission, it can also be other structures, which will not be elaborated here.

[0141] Based on the above embodiments, when one swing arm 2 is provided, its swing arm 2 can be connected to a moving blade head 71, that is, the product is a single-blade hair clipper or shaver. When two swing arms 2 are provided, the moving blade head 71 is connected to each of the two swing arms 2, that is, a double-blade hair clipper. Based on the above inspiration, due to the existence of the connecting rod 4, as long as one swing arm 2 can be driven by the eccentric shaft 15 of the motor 1 to produce linear movement, the other swing arms 2 can achieve synchronous movement of multiple swing arms 2 through the connecting rod 4 and the guide limiting structure. Therefore, the product can also have multiple swing arms 2, such as three, four, five or even more, which will not be elaborated here.

[0142] Example 3: (Double eccentric shaft 15 + two swing arms 2)

[0143] Unlike the embodiments described above, in this embodiment, reference is made to... Figure 1 , 2 3 and 6, there are two swing arms 2. The motor 1 is a dual-shaft extension motor 1, with output shafts 14 and eccentric shafts 15 at both ends. The two swing arms 2 are arranged side by side on the outer periphery of the motor 1 along the axial direction of the motor 1. The two eccentric shafts 15 are respectively rotatably connected to bearing seats 5, and are connected to the corresponding sheet-like elastic bodies 3 through the bearing seats 5, and are connected to the corresponding swing arms 2 through the sheet-like elastic bodies 3. In this way, when the motor 1 is running, the two output shafts 14 move synchronously, and then drive the two swing arms 2 to move synchronously through the sheet-like elastic bodies 3.

[0144] Preferably, the two eccentric shafts 15 are symmetrically arranged with the axis of the motor 1 as the line of symmetry. The advantage of this design is that when the output shaft 14 is driven to rotate by the motor 1, the two eccentric shafts 15 drive the two swing arms 2 to move synchronously in opposite directions. This effectively reduces vibration when the swing arms 2 reciprocate, making the product quieter during use.

[0145] Based on the above three embodiments, the sheet-like elastomer 3 can be disposed on one side of the eccentric shaft 15 or on both sides of the eccentric shaft 15. When disposed on both sides, the adjacent ends of the two sheet-like elastomers 3 are respectively installed on the bearing seats 5 outside the eccentric shaft 15, and the other ends of the two sheet-like elastomers 3 are respectively installed on both ends or near the ends of the swing arm 2. When the sheet-like elastomers 3 are disposed on both sides of the bearing seats 5, a stable "double clamping" transmission structure is formed. This symmetrical force distribution makes the application point of the driving force more balanced, improves the transmission stability of the motor 1 driving the moving cutter head 71 through the sheet-like elastomers 3, and ensures the independence and high stability of the movement of each swing arm 2 under dual-axis drive. The following embodiments also take the sheet-like elastomers 3 disposed on both sides of the bearing seats 5 as an example.

[0146] In this embodiment, the sheet elastomer 3 can be made of metal or plastic, and can only be guaranteed to have rigidity in the direction of movement of the swing arm 2, while having a certain elastic deformation performance in the component movement perpendicular to the direction of movement of the swing arm 2. It can also be made of other materials.

[0147] Based on the above embodiments, referring to Figure 1-9 As a specific embodiment of the sheet-like elastomer 3, its shape can be a linear sheet structure or a structure with a bend 311. As long as it can utilize its own elastic deformation capability in a specific direction to convert the circular motion of the eccentric shaft 15 into a linear motion of the swing arm 2 in a single direction, it can also be other shapes. The different shapes of the sheet-like elastomer 3 will be described below.

[0148] For ease of description, the sheet-like elastomer 3 with the bent portion 311 is referred to as the first elastic piece 31, and the sheet-like elastomer 3 with the linear sheet structure is referred to as the second elastic piece 32.

[0149] Reference Figure 1 , 3 7 and 8, as the first embodiment of the first fragment 31:

[0150] One end of the first spring piece 31 is connected to the bearing housing 5, and the other end is connected to the swing arm 2. The bent part 311 bends inward along the axial direction of the motor 1. The bending of the bent part 311 makes it easier for the first spring piece 31 to bend in its thickness direction, thereby effectively dissipating the displacement of the eccentric shaft 15 in the thickness direction of the first spring piece 31. This allows the first spring piece 31 to drive the swing arm 2 to move linearly left and right under the drive of the eccentric shaft 15, without vertical displacement. In addition, the bending shape can distribute the force, avoid stress concentration during bending deformation, and reduce unnecessary energy loss (i.e., reduce the load on the motor 1). At the same time, the bending shape can accommodate the longest possible first spring piece 31 in the smallest possible space, maximizing the use of product space and optimizing the product structure.

[0151] Preferred, refer to Figure 7 and 8 The bent section of the first fragment 31 can be like Figure 7 The "sharp bend" shown can also be Figure 8 The relatively gentle "gentle bend" in the middle can be a bend segment, or it can be two bend segments 311 or more. For example, when the first spring piece 31 is provided with multiple bends, its multiple bend segments 311 are set continuously to form a wave shape, or multiple bend segments are not set continuously, but are set at intervals. Of course, it can also be other shapes, which will not be described in detail here.

[0152] Based on the above embodiments, in order to facilitate the connection between the swing arm 2 and the first spring plate 31, a mounting foot 21 extending toward the first spring plate 31 can be provided at the end of the swing arm 2, so as to facilitate the connection between the swing arm 2 and the first spring plate 31 at the end of the motor 1.

[0153] Reference Figure 2 As a second embodiment of the first spring sheet 31, unlike the above embodiment, the overall thickness direction of the sheet-like elastomer 3 is oriented towards the height direction of the hair clipper, while in this embodiment, the bent end of the first spring sheet 31 extends radially towards the motor 1. It has a connected horizontal plane and a vertical plane. The horizontal plane is set along the Y-axis direction, and the vertical plane is set along the Z-axis direction. That is, the end face formed by the horizontal plane is parallel to the end face formed by the upper end face of the swing arm 2, and the plane formed by the vertical plane is parallel to the axial end face of the motor 1, that is, perpendicular to the movement direction of the swing arm 2. The advantage of this shape is that it can optimize the force distribution, making the transmission of the swing arm 2 more stable when the motor 1 is in motion. At the same time, it is not necessary to set the aforementioned mounting foot 21 on the swing arm 2, saving costs.

[0154] Based on the above embodiments, referring to Figure 1 and 9 As a specific embodiment of the second spring 32, unlike the first spring 31, it can omit the bending part 311 and is designed as a regular linear sheet structure, such as a rectangular sheet structure. It can also convert the circumferential motion of the eccentric shaft 15 into the reciprocating linear motion of the swing arm 2 in the left and right directions simply by using the thin sheet feature of the long-direction sheet structure.

[0155] Based on the above embodiments, the second spring 32 is preferably an integrally molded part.

[0156] Furthermore, in order to improve the bending capacity of the second elastic sheet 32 ​​in its thickness, so as to improve the ability of the second elastic sheet 32 ​​to counteract and absorb the vertical component motion of the eccentric shaft 15, as an embodiment of the second elastic sheet:

[0157] The second spring 32 has a middle deformation section along its extension direction. The bending stiffness of the middle deformation section is lower than that of its two ends. By taking advantage of the fact that the middle deformation area is easy to bend in its thickness direction, the absorption capacity of the second spring 32 for the vertical component motion of the eccentric shaft 15 can be improved, so that the motion trajectory of the swing arm 2 is limited to linear motion in the left and right directions, thereby making the swing arm 2 run more smoothly.

[0158] As a second embodiment of the second spring 32, unlike the above embodiment, the second spring 32 achieves its bending ability in the thickness direction by changing the elastic modulus of the material in the intermediate deformation zone. In this embodiment, the second spring 32 can be made of a homogeneous material, and the above effect can also be achieved by thinning the thickness of the intermediate deformation zone relative to both ends.

[0159] Based on the above embodiments, the following can be combined and matched according to the actual needs of the product: the sheet-like elastomer 3 is provided on one or both sides of the bearing seat 5; the sheet-like elastomer 3 is multi-layered or spaced along the thickness direction; the first elastomer 61 and the second elastomer 62 are provided individually or simultaneously; and a magnetic preload is provided between the bearing seat 5 and the motor 1.

[0160] like Figure 3 and 14 As shown, a preferred embodiment is provided, taking the sheet-like elastic body 3 as the first spring 31 as an example. The bending direction of its bent portion 311 is towards the axial direction of the motor 1. The two ends of the swing arm 2 are provided with mounting feet 21 extending towards the first elastic body 61. The first spring 31 forms two sets in its thickness direction. The two sets of first spring 31 are respectively fixedly connected to both sides of the bearing seat 5. The first elastic body 61 is provided at the end of the swing arm 2 and on the outer surface of the motor 1. The second elastic element is provided at the lower end of the swing arm 2, and its two ends are respectively installed between the mounting feet 21 and the housing 11 of the motor 1. In addition, a magnet is installed on the bearing seat 5 and maintains a magnetic preload with the housing 11 of the motor 1 to reduce the amount of movement between the first spring and the motor 1, so that the swing arm 2 runs more smoothly when the first spring 31 is in motion. In addition, in this embodiment, When the first elastic body 61 and the second elastic body 62 are set simultaneously, they can effectively improve the support and reset of the swing arm 2 by the elastic reset component 6, and further improve the absorption and processing capacity of the swing arm 2 due to inertia. This makes the vibration suppression effect of the entire hair clipper better when the swing arm 2 is driven by the sheet elastic body 3, greatly improving the user experience. The two sets of first elastic sheets 31 stacked on both sides of the bearing seat 5 can effectively improve the rigidity and strength of the sheet elastic body 3 in the non-swing arm 2 movement direction while ensuring that the sheet elastic body 3 can bend normally in its thickness direction. This makes the transmission more direct and efficient, disperses the alternating stress, and improves the fatigue life and overall reliability. In summary, the product has the characteristics of high quietness, low wear, and long life, and is also compact and stable.

[0161] In this embodiment, an internal rotor motor 1 is used as an example. Since this is existing technology, only a simple description of the key components is provided here. Figure 14 It includes a housing 11 of motor 1, a coil 12 assembly, an output shaft 14 (also called a rotor spindle), a rotor magnet and bearings, etc. The rotor magnet 13 is wrapped around the outside of the output shaft 14, and both are located inside the coil 12 assembly. The aforementioned eccentric shaft 15 is correspondingly located at the end of the output shaft 14.

[0162] In this embodiment, the housing 11 of the motor 1 includes a first housing 111 for wrapping the coil 12 assembly and a second housing 112 disposed outside the first housing 111. The second housing 112 can be used to connect with the first elastic body 61, and one end of the second elastic body 62 is correspondingly mounted on the first housing 111.

[0163] Example 4: (Vertical motor 1 + single swing arm 2)

[0164] In the above embodiments, the swing arm 2 is located on the radial outer periphery of the motor 1, and the motor 1 is horizontally arranged along the front-rear direction of the frame. In this embodiment, the motor 1 adopts a vertical design, and the sheet-like elastic body 3, taking the first elastic sheet 31 as an example, has its swing arm 2 located at one axial end of the motor 1, as shown in the figure. Figure 10 In this embodiment, one swing arm 2 can be provided. At this time, the eccentric shaft 15 located on the upper end of the motor 1 is rotatably connected to the bearing seat 5. The first spring piece 31 is designed as an "n" shaped structure, with one end fixedly connected to the bearing seat 5 and the other end fixedly connected to the swing arm 2. At this time, the thickness direction of the first spring piece 31 corresponds to the Z-axis direction. When the eccentric shaft 15 rotates around the output shaft 14 under the drive of the output shaft 14 of the motor 1, the first spring piece 31 is bent in its thickness direction. Therefore, the component motion of the eccentric shaft 15 in this direction will not be transmitted to the swing arm 2. The swing arm 2 will not move along the Z-axis direction, but can only move linearly in the X-axis direction, thereby realizing the reciprocating linear motion of the moving cutter head 71 connected on the swing arm 2.

[0165] In this embodiment, the first spring piece 31 is designed as an "n" shaped structure. Of course, it can also be other shapes, such as "w", "v", "C" shaped structures, as long as it is used to convert the circular motion of the eccentric shaft 15 into the reciprocating linear motion of the swing arm 2. It can also be other shapes, which will not be described in detail here.

[0166] Example 5: (Vertical motor 1 + single eccentric shaft 15 + double swing arm 2)

[0167] Based on the above embodiment 4, the difference from embodiment 4 is that: this embodiment uses two swing arms 2, which are arranged side by side. The eccentric shaft 15 is connected to one end of the first spring plate 31 through the bearing seat 5. The other end of the first spring plate 31 is connected to the swing arm 2 for transmission. Referring to the above embodiment 2, the connecting rod 4 is used to realize that the movement of one swing arm 2 drives the other swing arm 2 to move synchronously in the same direction or synchronously in opposite directions.

[0168] In this embodiment, refer to Figure 2 , 4 5. When two adjacent swing arms 2 swing synchronously in opposite directions through the connecting rod 4, the positioning shaft 43 located in the middle of the connecting rod 4 can be installed on the housing 7 of the motor 1.

[0169] Example 6: (Vertical motor 1 + double eccentric shaft 15 + double swing arm 2)

[0170] In the above embodiment 5, an eccentric shaft 15 is used in conjunction with a connecting rod 4 to drive the movement of two synchronous swing arms 2. In this embodiment, refer to Figure 11 , 12 In configuration 13, two eccentric shafts 15 are set to drive the two swing arms 2 synchronously. Specifically, the eccentric shaft 15 includes a primary shaft protrusion 151 eccentrically set with respect to the output shaft 14 of the motor 1 and a secondary shaft protrusion 152 located at the end of the primary shaft protrusion 151. Two bearing seats 5 are provided. For ease of description, the two bearing seats 5 are referred to as the primary bearing seat 53 and the secondary bearing seat 54, respectively. The primary bearing seat 53 is rotatably sleeved on the outside of the primary shaft protrusion 151. A swing arm 2 is connected to the side of the primary bearing seat 53 through a first spring 31. The secondary bearing seat 54 is rotatably connected to the outside of the secondary shaft protrusion 152. The side of the secondary bearing seat 54 is connected to another swing arm 2 through another first spring 31. Thus, when the motor 1 drives the output shaft 14 to rotate, the primary shaft protrusion 151 and the secondary shaft protrusion 152 respectively drive the corresponding swing arm 2 to move through the first spring 31 connected to themselves, thereby realizing the synchronous movement of the two swing arms 2.

[0171] In this embodiment, the primary shaft protrusion 151 and the secondary shaft protrusion 152 can be linearly arranged. In this case, the two swing arms 2 move synchronously and in the same direction under the drive of the motor 1. Preferably, referring to... Figure 13 To reduce excessive vibration of the hair clipper during transmission, the primary shaft protrusion 151 and the secondary shaft protrusion 152 are arranged in parallel and symmetrically with the axis of motor 1 as the line of symmetry. In this way, when the output shaft 14 of motor 1 rotates, the two swing arms 2 can be driven to move synchronously and in opposite directions through the two staggered parallel primary shaft protrusions 151 and secondary shaft protrusions 152, thereby effectively reducing the excessive vibration of the product during movement.

[0172] Based on the above embodiments 4, 5 and 6, the first spring plate 31 can be on one side or both sides of the eccentric shaft 15. Preferably, the first spring plate 31 is provided on both sides of the eccentric shaft 15 to improve the connection and transmission stability between the swing arm 2 and the eccentric shaft 15.

[0173] Based on the above embodiments, the motor 1 serves as a power source for the eccentric shaft 15 to perform circular motion around its axis. It can be an external rotor brushless motor 1, an axial brushless motor 1, a brushed internal rotor motor 1, a hollow cup motor 1, or a stepper motor 1, etc.

[0174] Based on the above embodiments, the aforementioned bias shaft and output shaft 14 can be integrally formed, or they can be fixed by insertion, welding, or other methods. The eccentric shaft 15 can also be paired with an intermediate component to achieve an eccentric setting with the output shaft 14. For example, the intermediate component is a wheel 153 located on the eccentric shaft 15 and the output shaft 14. When the output shaft 14 rotates, the wheel 153 drives the eccentric shaft 15 to make a circular motion around the output shaft 14. That is, the eccentric shaft 15 can be a separate columnar structure, or it can be paired with an intermediate part to achieve an eccentric setting with the output shaft 14. For example, in the above embodiment 6, when the secondary shaft protrusion 152 is combined with the primary shaft protrusion 151, it is connected to the primary shaft protrusion 151 through a wheel 153. That is, the secondary shaft protrusion 152 and the wheel 153 form a complete eccentric wheel structure. It is conceivable that the primary shaft protrusion 151 can also be a complete eccentric wheel structure connected to the output shaft 14.

[0175] Based on the above embodiments, referring to Figure 1 , 15 16 and 17 are specific connection methods between the moving cutter head 71 and the swing arm 2. The two can be connected by a connecting frame 8. Specifically, the connecting frame 8 includes a mounting head 81 connected to the moving cutter head 71 and a bracket 82 located at the lower end of the connecting head for fixed connection with the swing arm 2. Taking two swing arms 2 driving two moving cutter heads 71 ​​as an example, the two connecting frames 8 are respectively located between the two moving cutter heads 71 ​​and the two swing arms 2. The bracket 82 is bent and the brackets 82 of the two connecting frames 8 are staggered, and a clearance cavity is formed at the intersection. The clearance cavity extends along the movement direction of the swing arm 2. The purpose of designing the bracket 82 as bent so that the brackets 82 of the two connecting frames 8 are staggered is to perfectly solve the mechanical interference problem that may occur in the high-speed reciprocating motion of two independent motion units in an extremely limited space, and to ensure the reliability and safety of the high-density double cutter head layout. At the same time, the staggered arrangement can also reduce the amount of motion sway between the two swing arms 2, that is, reduce the sway between the two swing arms 2 along the Z-axis, so that the two swing arms 2 are more stable when running.

[0176] Based on the above embodiments, please refer to Figure 15 and 16 Referring to this embodiment, a hair clipper is provided, taking a common reciprocating shaver as an example, including a housing 7, a moving head 71, and a fixed head 72. The motor 1 is fixed in the housing 7 by bolts, clips or other means. The housing 7 has a long strip-shaped reserved groove in the area corresponding to the movement of the swing arm 2. The width of the groove is slightly larger than the thickness of the swing arm 2 to ensure that the swing arm 2 moves smoothly without interference. At the same time, the edge of the reserved groove is rounded to avoid scratching the parts.

[0177] Based on the above embodiments, please refer to Figure 11 , 12In embodiment 18, this embodiment provides an electric hair clipper, including a housing 7, a moving blade head 71, and a fixed blade head 72. In the above embodiment, the moving blade head 71 and the swing arm 2 are connected by a connecting frame 8. Alternatively, the swing arm 2 and the moving blade head 71 can be connected by other means. For example, when the hair clipper is an electric hair clipper, the moving blade head 71 can be slidably disposed on one side of the fixed blade head 72. The moving blade head 71 is mounted on a moving blade holder, which has an assembly groove. A drive rod 9 is fixedly connected to either of the two swing arms 2. The upper end of the drive rod 9 is correspondingly embedded in the blade assembly groove. When the swing arm 2 reciprocates, the drive rod 9 drives the moving blade head 71 to reciprocate, thereby achieving the hair trimming effect.

[0178] In this embodiment, the drive rod 9 can also be directly mounted on the moving cutter head 71, thereby realizing the connection between the drive rod 9 and the moving cutter head 71. The two can also be fixed by screwing, snapping, welding or other methods, which will not be elaborated here.

[0179] 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 linear transmission mechanism, characterized in that, include: An electric motor, wherein an eccentric shaft is provided on its output shaft, and the eccentric shaft is arranged parallel to the output shaft; The swing arm is used to connect the moving cutter head; A sheet-like elastomer is rotatably connected to the eccentric shaft and to the swing arm; The sheet-like elastomer is configured to have elastic deformation capability in its thickness direction and rigidity in its length and width directions, thereby converting the circular motion of the eccentric shaft into the reciprocating linear motion of the swing arm in a single direction.

2. The linear transmission mechanism according to claim 1, characterized in that, It also includes an elastic reset element, which is connected between the swing arm and the motor housing to provide an elastic reset force after the swing arm is displaced.

3. A linear transmission mechanism according to claim 2, characterized in that, The elastic reset member includes a first elastic body disposed between the outer side of the swing arm and the housing of the motor and / or a second elastic body disposed between the inner side of the swing arm and the housing of the motor.

4. A linear transmission mechanism according to claim 3, characterized in that, The first elastomer is a sheet-like structure with its thickness direction facing the reciprocating motion direction of the swing arm, and it has elastic deformation capability only in the thickness direction.

5. A linear transmission mechanism according to claim 3, characterized in that, The second elastic body is an elastic element with damping characteristics, used to eliminate the inertial vibration of the swing arm.

6. A linear transmission mechanism according to claim 1, characterized in that, The sheet-like elastomer is composed of multiple layers stacked together.

7. A linear transmission mechanism according to claim 1, characterized in that, The sheet-like elastomers are spaced apart along the thickness direction.

8. A linear transmission mechanism according to claim 1, characterized in that, The eccentric shaft is externally rotatably connected to a bearing housing, and one end of the sheet-like elastomer is rotatably connected to the eccentric shaft through the bearing housing.

9. A linear transmission mechanism according to claim 8, characterized in that, A magnetic preload is provided between the bearing housing and the motor to maintain the sheet elastomer in a preload orientation toward the motor.

10. A linear transmission mechanism according to claim 1, characterized in that, The sheet-like elastomer has a linear sheet-like structure, and the swing arm is provided with mounting feet extending toward the sheet-like elastomer.

11. A linear transmission mechanism according to claim 1, characterized in that, The sheet-like elastomer has at least one bent portion.

12. A linear transmission mechanism according to claim 11, characterized in that, The bending portion is configured to bend in the horizontal plane where the motor axis is located, and the swing arm is provided with mounting feet extending toward the sheet-like elastomer so that the sheet-like elastomer can be connected to the eccentric shaft.

13. A linear transmission mechanism according to claim 11, characterized in that, The bent portion bends radially toward the motor and includes a connected horizontal plane and a vertical plane. The horizontal plane is parallel to the swing arm, and the vertical plane is perpendicular to the swing arm.

14. A linear transmission mechanism according to claim 1, characterized in that, The swing arm is provided at least one and is located radially outside the motor.

15. A linear transmission mechanism according to claim 14, characterized in that, The eccentric shaft is located at one axial end of the motor. There are two swing arms, one of which is connected to the eccentric shaft via a sheet-like elastic body. Adjacent swing arms are linked by a connecting rod to achieve synchronous movement between adjacent swing arms.

16. A linear transmission mechanism according to claim 15, characterized in that, The middle part of the connecting rod is rotatably mounted via a positioning shaft, and both ends are movably connected to two swing arms, so that when any one of the swing arms moves, it drives the other swing arm to move synchronously in the opposite direction.

17. A linear transmission mechanism according to claim 15, characterized in that, The two ends of the connecting rod are respectively fixedly connected to the two swing arms so that the two swing arms move synchronously in the same direction.

18. A linear transmission mechanism according to claim 14, characterized in that, The swing arm is provided in two parts, and the eccentric shaft is located at both ends of the axial direction of the motor. The two eccentric shafts are respectively connected to the corresponding swing arm through the sheet-like elastic body.

19. A linear transmission mechanism according to claim 18, characterized in that, The two eccentric shafts are symmetrically arranged about the axis of the motor.

20. A linear transmission mechanism according to claim 18, characterized in that, The eccentric shaft is externally rotatably connected to a bearing housing. The sheet-like elastomers are located on both sides of the bearing housing. The adjacent ends of the two sheet-like elastomers are rotatably connected to the eccentric shaft through the bearing housing, and the other ends are fixed to the swing arm.

21. A linear transmission mechanism according to claim 20, characterized in that, The sheet-like elastomer is provided in at least two sets on one side of the bearing housing, and multiple sets of the sheet-like elastomer are arranged at vertical intervals, with each set containing at least one sheet-like elastomer.

22. A linear transmission mechanism according to claim 21, characterized in that, The end of the swing arm is provided with a mounting foot extending toward the sheet-like elastomer. An elastic reset member is provided between the motor housing and the swing arm. The elastic reset member includes a first elastomer disposed at the end of the swing arm and the motor housing, and a second elastomer disposed between the mounting foot and the motor housing.

23. A linear transmission mechanism according to claim 1, characterized in that, The swing arm is located along the axial direction of the motor, and the swing arm has at least one.

24. A linear transmission mechanism according to claim 23, characterized in that, The swing arms are provided in two parts. The eccentric shaft is connected to either swing arm through the sheet-like elastic body. The adjacent swing arms are linked by a connecting rod to achieve synchronous movement between the adjacent swing arms.

25. A linear transmission mechanism according to claim 23, characterized in that, The swing arm is provided in two parts, and the eccentric shaft includes a primary shaft protrusion provided on the output shaft and a secondary shaft protrusion provided at the end of the primary shaft protrusion. The primary shaft protrusion and the secondary shaft protrusion are respectively connected to the two swing arms through the sheet-like elastomer.

26. A linear transmission mechanism according to claim 25, characterized in that, The primary and secondary shaft protrusions are parallel and symmetrically arranged with the output shaft as the line of symmetry, or the primary and secondary shaft protrusions are linearly arranged.

27. A linear transmission mechanism according to claim 25, characterized in that, The primary shaft protrusion and the output shaft, as well as the secondary shaft protrusion and the primary shaft protrusion, are connected by a connecting part to achieve an eccentric setting between the primary shaft protrusion and the output shaft, and an eccentric setting between the secondary shaft protrusion and the primary shaft protrusion.

28. A linear transmission mechanism according to any one of claims 1-27, characterized in that, The sheet-like elastomer is disposed on one or both sides of the eccentric shaft.

29. A linear transmission mechanism according to any one of claims 14-19 and 23-27, characterized in that, The eccentric shaft is rotatably fitted with a bearing housing, which is rotatably connected to the sheet-like elastomer through the bearing housing.

30. A linear transmission mechanism according to claim 29, characterized in that, A magnetic preload is provided between the bearing housing and the motor to maintain the sheet-like elastomer with a preload force facing the motor.

31. A linear transmission mechanism according to any one of claims 13-27, characterized in that, The sheet-like elastomer has a linear sheet structure, or the sheet-like elastomer has at least one bent portion.

32. A linear transmission mechanism according to any one of claims 1-27, characterized in that, The swing arm is provided with a connecting frame for connecting the moving cutter head. The connecting frame has a mounting head for connecting the moving cutter head and a bracket for connecting the mounting head to the swing arm.

33. A linear transmission mechanism according to claim 32, characterized in that, The swing arm is provided in two parts, and the two brackets are staggered in the reciprocating motion direction of the swing arm, forming a clearance cavity at the staggered point to allow the swing arm to reciprocate.

34. A hair clipper, characterized in that, The hair clipper includes a housing, a moving blade, a fixed blade, and a linear transmission mechanism as described in any one of claims 1 to 27, 32, and 33, and the hair clipper includes a razor or electric clippers.

35. A hair clipper, characterized in that, The device includes a housing, a moving cutter head, a fixed cutter head, and a linear transmission mechanism as described in any one of claims 1 to 27. The swing arm is provided with a drive rod, the moving cutter head is provided with an assembly hole, and the end of the drive rod away from the moving cutter head is correspondingly installed in the assembly hole.

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