A hand-operated pencil sharpener

Abstract

The application discloses a hand-operated pencil sharpener, which comprises a cutter holder assembly and a rocker arm assembly, and a gear reduction mechanism is arranged between the cutter holder assembly and the rocker arm assembly. The rocker arm assembly drives the cutter holder assembly to rotate through the gear reduction mechanism. The gear reduction mechanism comprises an input gear, a speed change gear and an output gear which are sequentially connected. The input gear is connected with the rocker arm assembly, and the output gear is connected with the cutter holder assembly. When the rocker arm assembly is forced to drive the input gear to rotate, the input gear acts on the output gear through the speed change gear, so that the output gear drives the cutter holder assembly to rotate at a reduced speed. The gear reduction mechanism composed of the input gear, the speed change gear and the output gear is additionally arranged, the torque is increased, and the cutter holder assembly rotates more stably and labor-savingly.

Description

Technical Field

[0001] This application relates to the field of stationery technology, and more specifically to a hand-cranked pencil sharpener. Background Technology

[0002] A hand-cranked pencil sharpener is a manual tool primarily used for sharpening pencils, colored pencils, wooden drawing brushes, and other writing implements. A typical hand-cranked pencil sharpener consists of a housing, a mechanism, and a crank handle. The mechanism includes a blade holder and a rotating blade mounted on the holder. The holder is fixedly connected to the crank handle. The user drives the blade holder to rotate, causing the rotating blade to move. Through the relative movement of the rotating blade and the pencil, the outer wooden layer of the pencil is removed, exposing the lead and sharpening it to a sharp point, making it easier to write or draw. Hand-cranked pencil sharpeners are widely used in learning, office work, and art. They rely entirely on manual operation and do not require a power source or batteries, allowing them to be used anywhere without power limitations. Compared to electric pencil sharpeners, hand-cranked sharpeners have lower manufacturing costs and are more affordable. However, traditional hand-cranked sharpeners require a certain amount of hand strength to overcome the wooden resistance of the pencil and the cutting force of the blade, making them less user-friendly for children with relatively weak hand muscles.

[0003] To address the aforementioned issues, Chinese utility model patent CN203766352U discloses a vertical hand-cranked pencil sharpener, comprising a housing, a pencil feed clamping mechanism, a roller cutter assembly, and a hand crank. The housing has a pencil feed hole, the hand crank is located on the side of the housing, and the pencil feed clamping mechanism and roller cutter assembly are housed within the housing. The pencil feed hole is located at the upper end of the housing, the pencil feed clamping mechanism is positioned below the pencil feed hole, and the roller cutter assembly is located below the pencil feed clamping mechanism. A gear steering mechanism is provided between the hand crank and the roller cutter assembly. This technical solution utilizes multi-stage gears to achieve a 90-degree steering of the force, reducing the hand cranking effort required during sharpening and solving the problem of the laborious use of traditional hand-cranked pencil sharpeners. However, the distribution of this multi-stage gear steering structure requires a large space, resulting in a larger overall product size. Furthermore, pencil shavings generated during sharpening easily fall onto the gears, affecting the lifespan of the gear steering mechanism. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a hand-cranked pencil sharpener, which increases torque by adding a gear reduction mechanism consisting of an input gear, a speed-changing gear and an output gear, making the blade holder assembly rotate more smoothly and effortlessly.

[0005] This application provides a hand-cranked pencil sharpener, including a blade holder assembly and a rocker arm assembly. A gear reduction mechanism is provided between the blade holder assembly and the rocker arm assembly. The rocker arm assembly drives the blade holder assembly to rotate through the gear reduction mechanism. The gear reduction mechanism includes an input gear, a speed-changing gear, and an output gear connected in sequence. The input gear is connected to the rocker arm assembly, and the output gear is connected to the blade holder assembly. When the rocker arm assembly is subjected to force and drives the input gear to rotate, the input gear acts on the output gear through the speed-changing gear, so that the output gear drives the blade holder assembly to rotate at a reduced speed.

[0006] In this technical solution, the rocker arm assembly is mainly used to drive the blade holder assembly to rotate. Users can apply force to the rocker arm assembly to rotate the blade holder assembly and use it to sharpen pencils and other pen-like tools. A gear reduction mechanism is added between the blade holder assembly and the rocker arm assembly. This mechanism connects to the rocker arm assembly via an input gear, which rotates synchronously with the rocker arm assembly. The gear reduction mechanism also connects to the blade holder assembly via an output gear, which rotates synchronously with the blade holder assembly. A transmission gear connects the input and output gears, allowing the rocker arm assembly to drive the input gear to rotate synchronously. The input gear transmits torque to the transmission gear, which outputs it to the output gear. The output gear drives the blade holder assembly to rotate at a reduced speed, thereby increasing torque and making the blade holder assembly rotate more smoothly and effortlessly. The gear reduction mechanism reduces the input speed of the rocker arm assembly while increasing torque, causing the blade holder assembly to rotate at a reduced speed. By converting the high-speed, low-torque input power into a low-speed, high-torque input power, the force required for the user to rotate the rocker arm mechanism is significantly reduced. This is especially important for children with less strength, making pencil sharpening much easier.

[0007] As an improvement, the variable speed gear includes a first gear ring and a second gear ring distributed on opposite sides. One side of the variable speed gear meshes with the input gear through the first gear ring, and the other side of the variable speed gear meshes with the output gear through the second gear ring. In this technical solution, the first gear ring is located on one side of the gear reducer and meshes with the input gear. The first gear ring is mainly used to receive power from the input gear and transmit it to the main body of the gear reducer. The second gear ring is located on the other side of the gear reducer and meshes with the output gear. The main function of the second gear ring is to transmit the power from the main body of the gear reducer to the output gear, thereby driving the tool holder assembly to rotate. The first and second gear rings are distributed on both sides of the gear reducer and mesh with the input and output gears respectively, making the structure of the entire gear reduction mechanism more compact and the power transmission path clearer. It also makes it possible to achieve different gear ratios. The core function of the gear reducer is to adjust the input and output speeds and torques. Through the design of the two gear rings, the gear reducer can achieve different degrees of speed reduction and torque amplification. The specific effect depends on the selection of the gear ratio, providing flexibility to the gear reducer. Different transmission ratios can be achieved by adjusting the number of teeth on the first and second gear rings, thereby meeting different usage requirements.

[0008] As an improvement, the output gear is equipped with a mounting shaft adapted to the input gear. The input gear is mounted on the mounting shaft, and the input gear and output gear can rotate relative to each other coaxially via the mounting shaft. In this technical solution, the output gear mounts the input gear via the mounting shaft, so that the input gear and output gear share a common center of rotation. The input gear is mounted on the mounting shaft, and this mounting connection allows the input gear to rotate freely around the mounting shaft while maintaining a coaxial relationship with the output gear, ensuring the coaxiality of the input and output gears. The input and output gears achieve coaxial rotation at different speeds through a speed-changing gear. The coaxial connection design makes the entire gear reduction mechanism more compact and reduces space occupation. On the other hand, some pencil sharpeners have a tip adjustment function, which requires coaxial force transmission. This application designs a coaxially connected input and output gear, so that it can be applied to a single pencil sharpener simultaneously with the tip adjustment function, resulting in better compatibility.

[0009] As an improvement, multiple gears are provided, all distributed circumferentially along the input and output gears. In this technical solution, the distribution of multiple gears makes power transmission more reliable, reducing the risk of system failure due to a single gear malfunction. The even distribution of multiple gears circumferentially along the input and output gears, similar to the layout of a planetary gear mechanism, makes the entire gear reduction mechanism more compact and reduces space occupation. Furthermore, through the design of the input, gears, and output gears, the gear reduction mechanism can achieve a wider speed ratio adjustment range compared to a planetary gear mechanism, allowing for more flexible adaptation to different transmission needs and providing more precise speed and torque control.

[0010] As an improvement, the rocker arm assembly is provided with a first snap-fit ​​structure, and the input gear is provided with a first latching position adapted to the first snap-fit ​​structure. The first snap-fit ​​structure and the first latching position are connected to enable the input gear and the rocker arm assembly to rotate synchronously. In this technical solution, the connection between the first snap-fit ​​structure and the first latching position is used to connect the input gear and the rocker arm assembly. The input gear can rotate synchronously with the rocker arm assembly, thereby achieving effective power transmission. The design of the first snap-fit ​​structure and the first latching position simplifies the assembly process and reduces assembly time and cost.

[0011] As an improvement, the first latch is a strip-shaped groove structure. The first snap-fit ​​structure and the first latch are rotatably connected. A positioning protrusion is provided within the first latch, and a positioning groove adapted to the positioning protrusion is provided within the first snap-fit ​​structure. The positioning protrusion connects with the positioning groove to limit the rotation of the input gear and the rocker arm assembly. In this technical solution, the first latch is designed as a strip-shaped groove structure. The first latch of the strip-shaped groove structure connects to the first snap-fit ​​structure, providing stable connection and limiting functions. The first snap-fit ​​structure and the first latch are rotatably connected, simplifying assembly. The positioning protrusion within the first latch provides a limiting function, and the positioning groove in the first snap-fit ​​structure, through the connection between the positioning protrusion and the positioning groove, limits the rotation of the input gear and the rocker arm assembly. The rocker arm assembly, under force, can drive the input gear to rotate synchronously, preventing relative free rotation between the rocker arm assembly and the input gear, improving the stability and reliability of the connection, and reducing the risk of failure due to loosening or disengagement.

[0012] As an improvement, one end of the tool holder assembly is provided with a second snap-fit ​​structure, and the output gear is provided with a second latching position adapted to the second snap-fit ​​structure. The second snap-fit ​​structure and the second latching position are connected to enable the output gear and the tool holder assembly to rotate synchronously. In this technical solution, the connection between the second snap-fit ​​structure and the second latching position is used to realize the connection between the output gear and the tool holder assembly. The tool holder assembly can rotate synchronously with the output gear, thereby realizing the effective transmission of power. The design of the second snap-fit ​​structure and the second latching position makes the assembly process simpler and reduces assembly time and cost. On the other hand, the second snap-fit ​​structure and the second latching position can be rotatably connected. A step adapted to the second snap-fit ​​structure can be set in the second latching position. The step is used to provide a limiting function. By the second snap-fit ​​structure abutting against the step, the rotation limit of the tool holder assembly and the output gear is realized. The output gear can drive the tool holder assembly to rotate synchronously, avoiding relative free rotation between the tool holder assembly and the output gear, improving the stability and reliability of the connection, and reducing the risk of failure due to loosening or disengagement.

[0013] As an improvement, a tool holder connecting seat and a cover plate are also included. The tool holder connecting seat is provided with an internal gear ring for engaging the tool holder assembly. The rocker arm assembly is rotatably mounted on the cover plate. The tool holder connecting seat and the cover plate are connected to form a receiving cavity, and the gear reduction mechanism is installed in the receiving cavity. In this technical solution, the tool holder connecting seat, by setting an internal gear ring, engages with the gear on the tool holder assembly to ensure the normal cutting function of the tool holder assembly. The cover plate is used to connect the housing of the pencil sharpener and can install the rocker arm assembly. The cover plate provides stable support and rotation function for the rocker arm assembly. The tool holder connecting seat and the cover plate, after being connected, form a receiving cavity for installing the gear reduction mechanism, protecting the internal components and providing a compact structure. The receiving cavity protects the gear reduction mechanism, preventing pencil shavings and impurities from entering, and extending the service life of the gear reduction mechanism.

[0014] As an improvement, the tool holder connecting seat is provided with a mounting post adapted to the transmission gear, and the transmission gear is rotatably mounted on the mounting post. In this technical solution, the mounting post on the tool holder connecting seat is used to rotatably mount the transmission gear, allowing the transmission gear to rotate freely on the tool holder connecting seat, thereby achieving effective power transmission and ensuring that the transmission gear can accurately mesh with the input gear and output gear. With the support of the mounting post, the transmission gear is more stable and reliable during transmission. Furthermore, the mounting of the transmission gear on the tool holder connecting seat via the mounting post makes the entire connection structure more compact, reduces space occupation, and improves the smoothness of power transmission.

[0015] As an improvement, one end of the input gear passes through the cover plate and connects to the rocker arm assembly, while one end of the tool holder assembly passes through the tool holder connecting seat and connects to the output gear. In this technical solution, one end of the input gear passes through the cover plate and is directly connected to the rocker arm assembly, allowing the rotation of the rocker arm assembly to be directly transmitted to the input gear, thus inputting power. The cover plate provides fixation and support, making the connection between the input gear and the rocker arm assembly more stable and reducing loosening and shaking during use. Similarly, one end of the tool holder assembly passes through the tool holder connecting seat and is directly connected to the output gear. The tool holder connecting seat also provides fixation and support, making the connection between the tool holder assembly and the output gear more stable and reducing loosening and shaking during use. The rotation of the rocker arm assembly is transmitted to the speed-changing gear via the input gear. After speed-changing, the power is transmitted to the tool holder assembly via the output gear, ultimately driving the tool holder assembly to decelerate and increase torque, completing the sharpening operation. Assembly is simpler and more reliable, improving product lifespan and maintenance convenience. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a part of a hand-cranked pencil sharpener according to this application.

[0017] Figure 2 For this application Figure 1 An exploded view of the structure shown.

[0018] Figure 3 This is a three-dimensional structural diagram of the gear reduction mechanism in this application.

[0019] Figure 4 For this application Figure 1 A cross-sectional view of the structure shown.

[0020] Figure 5 For this application Figure 4 A magnified view of a portion of point A in the middle.

[0021] Figure 6 This is a three-dimensional structural diagram of the rocker arm assembly in this application.

[0022] Figure 7 This is a three-dimensional structural diagram of the output gear and tool holder assembly in this application.

[0023] Figure 8 This is a three-dimensional structural diagram of the output gear in this application.

[0024] The figure shows: 1. Tool holder assembly; 11. Second snap-fit ​​structure; 2. Rocker arm assembly; 21. First snap-fit ​​structure; 211. Positioning groove; 3. Gear reduction mechanism; 31. Input gear; 311. First snap-fit ​​position; 312. Positioning protrusion; 32. Speed ​​change gear; 321. First gear ring; 322. Second gear ring; 33. Output gear; 331. Mounting shaft; 332. Second snap-fit ​​position; 4. Tool holder connecting seat; 41. Internal gear ring; 42. Mounting post; 5. Cover plate. Detailed Implementation

[0025] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0026] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0027] It should also be understood that the terms "comprising," "including," "having," "containing," and "including," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (the specific types and constructions may be the same or different), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0028] Furthermore, it should be noted that the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components; they can refer to a direct installation on another component or the possible presence of another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] like Figures 1 to 8 As shown, this application discloses a hand-cranked pencil sharpener, including a blade holder assembly 1 and a rocker arm assembly 2. The rocker arm assembly 2 is mainly used to drive the blade holder assembly 1 to rotate. The user can apply force to the rocker arm assembly 2 to make the blade holder assembly 1 rotate to cut pencils and other pen tools. A gear reduction mechanism 3 is provided between the blade holder assembly 1 and the rocker arm assembly 2. The rocker arm assembly 2 drives the blade holder assembly 1 to rotate through the gear reduction mechanism 3. The gear reduction mechanism 3 includes an input gear 31, a speed-changing gear 32 and an output gear 33 connected in sequence. The input gear 31 is connected to the rocker arm assembly 2, and the output gear 33 is connected to the blade holder assembly 1. When the rocker arm assembly 2 is subjected to force to drive the input gear 31 to rotate, the input gear 31 acts on the output gear 33 through the speed-changing gear 32, so that the output gear 33 drives the blade holder assembly 1 to rotate at a reduced speed.

[0030] The gear reduction mechanism 3 is connected to the rocker arm assembly 2 via the input gear 31. The input gear 31 and the rocker arm assembly 2 rotate synchronously. The gear reduction mechanism 3 is connected to the tool holder assembly 1 via the output gear 33. The output gear 33 and the tool holder assembly 1 rotate synchronously. The input gear 31 and the output gear 33 are transmitted through the speed change gear 32. The rocker arm assembly 2 drives the input gear 31 to rotate synchronously. The input gear 31 transmits torque to the speed change gear 32. The speed change gear 32 outputs torque to the output gear 33. The output gear 33 drives the tool holder assembly 1 to rotate at a reduced speed, thereby increasing the torque and making the rotation of the tool holder assembly 1 smoother and less strenuous. The gear reduction mechanism 3 is used to reduce the input speed of the rocker arm assembly 2 while increasing the torque, so that the tool holder assembly 1 rotates at a reduced speed. Through the gear reduction mechanism 3, the high speed and low torque power input is converted into low speed and high torque power, which significantly reduces the force required for the user to turn the rocker arm mechanism. This is especially important for children with less strength, making it easier to sharpen pencils.

[0031] More specifically, such as Figure 3 and Figure 5As shown, the transmission gear 32 includes a first gear ring 321 and a second gear ring 322 distributed on opposite sides. One side of the transmission gear 32 meshes with the input gear 31 through the first gear ring 321, and the other side meshes with the output gear 33 through the second gear ring 322. The first gear ring 321 is located on one side of the transmission gear 32 and meshes with the input gear 31. The first gear ring 321 is mainly used to receive power from the input gear 31 and transmit it to the main body of the transmission gear 32. The second gear ring 322 is located on the other side of the transmission gear 32 and meshes with the output gear 33. The main function of the second gear ring 322 is to transmit the power from the main body of the transmission gear 32 to the output gear 33, thereby driving the transmission gear 32. When the moving tool holder assembly 1 rotates, the first gear ring 321 and the second gear ring 322 are distributed on both sides of the transmission gear 32 and mesh with the input gear 31 and the output gear 33 respectively, making the structure of the entire gear reduction mechanism 3 more compact and the power transmission path clearer. It also makes it possible to achieve different gear ratios. The core function of the transmission gear 32 is to adjust the input and output speed and torque. Through the design of the two gear rings, the transmission gear 32 can achieve different degrees of speed reduction and torque amplification. The specific effect depends on the selection of the gear ratio, which provides flexibility to the transmission gear 32. Different transmission ratios can be achieved by adjusting the number of teeth of the first gear ring 321 and the second gear ring 322, thereby meeting different usage requirements.

[0032] More specifically, such as Figure 2 and Figure 3 As shown, the output gear 33 is provided with a mounting shaft 331 adapted to the input gear 31. The input gear 31 is mounted on the mounting shaft 331. The input gear 31 and the output gear 33 can rotate relative to each other along the same axis via the mounting shaft 331. The output gear 33 mounts the input gear 31 via the mounting shaft 331, so that the input gear 31 and the output gear 33 share a common center of rotation. The mounting of the input gear 31 on the mounting shaft 331 allows the input gear 31 to rotate freely around the mounting shaft 331, while maintaining a connection with the output gear 33. The coaxial relationship ensures the coaxiality of the input gear 31 and the output gear 33. The input gear 31 and the output gear 33 rotate at different speeds on the same axis through the speed-changing gear 32. The coaxial connection design makes the entire gear reduction mechanism 3 more compact and reduces space occupation. On the other hand, some pencil sharpeners have a pencil tip adjustment function, which requires the force transmission to be coaxial. The coaxial connection of the input gear 31 and the output gear 33 in this application allows them to be used on the same pencil sharpener at the same time as the pencil tip adjustment function, resulting in better compatibility.

[0033] More specifically, such as Figure 2 and Figure 3As shown, multiple gears 32 are provided, and all gears 32 are distributed circumferentially along the input gear 31 and the output gear 33. Through the distribution of multiple gears 32, the power transmission is more reliable, reducing the risk of the entire system failing due to the failure of a single gear. The multiple gears 32 are evenly distributed circumferentially along the input gear 31 and the output gear 33, similar to the layout of a planetary gear mechanism, making the entire gear reduction mechanism 3 more compact and reducing space occupation. However, through the design of the input gear 31, gears 32 and output gear 33, the gear reduction mechanism 3 can achieve a wider range of speed ratio adjustment compared to a planetary gear mechanism, and can more flexibly adapt to different transmission needs, providing more precise speed and torque control.

[0034] More specifically, such as Figure 3 and Figure 6 As shown, the rocker arm assembly 2 is provided with a first snap-fit ​​structure 21, and the input gear 31 is provided with a first latching position 311 that is adapted to the first snap-fit ​​structure 21. The first snap-fit ​​structure 21 and the first latching position 311 are connected to enable the input gear 31 to rotate synchronously with the rocker arm assembly 2. The connection between the first snap-fit ​​structure 21 and the first latching position 311 is used to realize the connection between the input gear 31 and the rocker arm assembly 2. The input gear 31 can rotate synchronously with the rocker arm assembly 2, thereby realizing the effective transmission of power. The design of the first snap-fit ​​structure 21 and the first latching position 311 makes the assembly process simpler and reduces assembly time and cost.

[0035] More specifically, such as Figure 3 and Figure 6 As shown, the first latch 311 is a strip-shaped groove structure. The first latching structure 21 and the first latch 311 are rotatably connected. A positioning protrusion 312 is provided inside the first latch 311. The first latching structure 21 is provided with a positioning groove 211 that matches the positioning protrusion 312. The positioning protrusion 312 is connected to the positioning groove 211 to limit the rotation of the input gear 31 and the rocker arm assembly 2. The first latch 311 is designed as a strip-shaped groove structure. The first latch 311 with the strip-shaped groove structure is connected to the first latching structure 21, which can provide stable connection and limiting function. The first buckle 21 and the first buckle 311 are connected by rotation, making the assembly simple and labor-saving. A positioning protrusion 312 is provided in the first buckle 311 to provide a limiting function. The first buckle structure 21 is provided with a positioning groove 211. Through the connection between the positioning protrusion 312 and the positioning groove 211, the rotation limit between the input gear 31 and the rocker arm assembly 2 is realized. When the rocker arm assembly 2 is subjected to force, it can drive the input gear 31 to rotate synchronously, avoiding relative free rotation between the rocker arm assembly 2 and the input gear 31, improving the stability and reliability of the connection, and reducing the risk of failure due to loosening or disengagement.

[0036] More specifically, such as Figure 2 , Figure 7 and Figure 8 As shown, one end of the tool holder assembly 1 is provided with a second snap-fit ​​structure 11, and the output gear 33 is provided with a second latching position 332 adapted to the second snap-fit ​​structure 11. The second snap-fit ​​structure 11 and the second latching position 332 are connected to enable the output gear 33 to rotate synchronously with the tool holder assembly 1. The connection between the second snap-fit ​​structure 11 and the second latching position 332 is used to realize the connection between the output gear 33 and the tool holder assembly 1. The tool holder assembly 1 can rotate synchronously with the output gear 33, thereby realizing the effective transmission of power. The design of the second snap-fit ​​structure 11 and the second latching position 332 makes the assembly process simpler. This reduces assembly time and cost. On the other hand, the second snap-fit ​​structure 11 and the second snap-fit ​​position 332 can be rotatably connected. A step adapted to the second snap-fit ​​structure 11 can be set in the second snap-fit ​​position 332. The step is used to provide a limiting function. By abutting the second snap-fit ​​structure 11 against the step, the rotation limit of the tool holder assembly 1 and the output gear 33 is realized. The output gear 33 can drive the tool holder assembly 1 to rotate synchronously, avoiding relative free rotation between the tool holder assembly 1 and the output gear 33, improving the stability and reliability of the connection, and reducing the risk of failure caused by loosening or disengagement.

[0037] More specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, it also includes a tool holder connecting seat 4 and a cover plate 5. The tool holder connecting seat 4 is provided with an internal gear ring 41 for engaging the tool holder assembly 1. The rocker arm assembly 2 is rotatably mounted on the cover plate 5. The tool holder connecting seat 4 and the cover plate 5 are connected to form a receiving cavity. The gear reduction mechanism 3 is installed in the receiving cavity. The tool holder connecting seat 4 is provided with an internal gear ring 41, which engages with the gear on the tool holder assembly 1 to ensure the normal cutting function of the tool holder assembly 1. The cover plate 5 is used to connect the housing of the pencil sharpener and can install the rocker arm assembly 2. The cover plate 5 provides stable support and rotation function for the rocker arm assembly 2. After the tool holder connecting seat 4 and the cover plate 5 are connected, they form a receiving cavity for installing the gear reduction mechanism 3, protecting the internal components and providing a compact structure. The receiving cavity provides protection for the gear reduction mechanism 3, preventing pencil shavings and impurities from entering and extending the service life of the gear reduction mechanism 3.

[0038] More specifically, such as Figure 2As shown, the tool holder connecting seat 4 is provided with a mounting post 42 adapted to the speed change gear 32. The speed change gear 32 is rotatably mounted on the mounting post 42. The mounting post 42 is provided on the tool holder connecting seat 4 for rotatably mounting the speed change gear 32, allowing the speed change gear 32 to rotate freely on the tool holder connecting seat 4, thereby realizing the effective transmission of power and ensuring that the speed change gear 32 can accurately mesh with the input gear 31 and the output gear 33. With the support of the mounting post 42, the speed change gear 32 is more stable and reliable in the transmission process. Furthermore, the speed change gear 32 is mounted on the tool holder connecting seat 4 through the mounting post 42, making the entire connection structure more compact, reducing space occupation, and improving the smoothness of power transmission.

[0039] More specifically, such as Figure 1 and Figure 2 As shown, one end of the input gear 31 passes through the cover plate 5 and connects to the rocker arm assembly 2, and one end of the tool holder assembly 1 passes through the tool holder connecting seat 4 and connects to the output gear 33. The input gear 31 is positioned so that one end passes through the cover plate 5 and is directly connected to the rocker arm assembly 2, allowing the rotation of the rocker arm assembly 2 to be directly transmitted to the input gear 31, thus inputting power. The connection between the input gear 31 and the rocker arm assembly 2 is more stable due to the fixing and supporting effect of the cover plate 5, reducing loosening and shaking during use. Similarly, the connection between the tool holder assembly 1 and the output gear 33 is more stable due to the fixing and supporting effect of the tool holder connecting seat 4, reducing loosening and shaking during use. The rotation of the rocker arm assembly 2 is transmitted to the speed-changing gear 32 through the input gear 31. After speed-changing processing, the power is transmitted to the tool holder assembly 1 through the output gear 33, ultimately driving the tool holder assembly 1 to decelerate and increase torque, completing the pencil-sharpening operation. This makes assembly simpler and more reliable, improving the product's service life and maintenance convenience.

[0040] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to that of this application falls within the protection scope of this application.

Claims

1. A hand-cranked pencil sharpener, comprising a blade holder assembly (1) and a rocker arm assembly (2), characterized in that, A gear reduction mechanism (3) is provided between the tool holder assembly (1) and the rocker arm assembly (2). The rocker arm assembly (2) drives the tool holder assembly (1) to rotate through the gear reduction mechanism (3). The gear reduction mechanism (3) includes an input gear (31), a speed-changing gear (32), and an output gear (33) connected in sequence. The input gear (31) is connected to the rocker arm assembly (2), and the output gear (33) is connected to the tool holder assembly (1). When the rocker arm assembly (2) is subjected to force and drives the input gear (31) to rotate, the input gear (31) acts on the output gear (33) through the speed-changing gear (32) so that the output gear (33) drives the tool holder assembly (1) to rotate at a reduced speed.

2. A hand-cranked pencil sharpener according to claim 1, characterized in that, The speed-changing gear (32) includes a first gear ring (321) and a second gear ring (322) distributed on opposite sides. One side of the speed-changing gear (32) meshes with the input gear (31) through the first gear ring (321), and the other side of the speed-changing gear (32) meshes with the output gear (33) through the second gear ring (322).

3. A hand-cranked pencil sharpener according to claim 1, characterized in that, The output gear (33) is provided with a mounting shaft (331) adapted to the input gear (31). The input gear (31) is mounted on the mounting shaft (331). The input gear (31) and the output gear (33) can rotate relative to each other along the same axis through the mounting shaft (331).

4. A hand-cranked pencil sharpener according to claim 1 or 3, characterized in that, Multiple speed-changing gears (32) are provided, and the multiple speed-changing gears (32) are distributed circumferentially along the input gear (31) and the output gear (33).

5. A hand-cranked pencil sharpener according to claim 1, characterized in that, The rocker arm assembly (2) is provided with a first snap-fit ​​structure (21), and the input gear (31) is provided with a first latch (311) adapted to the first snap-fit ​​structure (21). The first snap-fit ​​structure (21) and the first latch (311) are connected to enable the input gear (31) and the rocker arm assembly (2) to rotate synchronously.

6. A hand-cranked pencil sharpener according to claim 5, characterized in that, The first latch (311) is a strip groove structure. The first latch structure (21) and the first latch (311) are rotatably connected. The first latch (311) is provided with a positioning protrusion (312). The first latch structure (21) is provided with a positioning groove (211) that matches the positioning protrusion (312). The positioning protrusion (312) is connected to the positioning groove (211) to limit the rotation of the input gear (31) and the rocker arm assembly (2).

7. A hand-cranked pencil sharpener according to claim 1, characterized in that, The tool holder assembly (1) is provided with a second snap-fit ​​structure (11) at one end, and the output gear (33) is provided with a second latch (332) adapted to the second snap-fit ​​structure (11). The second snap-fit ​​structure (11) and the second latch (332) are connected to make the output gear (33) and the tool holder assembly (1) rotate synchronously.

8. A hand-cranked pencil sharpener according to claim 1, characterized in that, It also includes a tool holder connecting seat (4) and a cover plate (5). The tool holder connecting seat (4) is provided with an internal gear ring (41) for engaging the tool holder assembly (1). The rocker arm assembly (2) is rotatably mounted on the cover plate (5). The tool holder connecting seat (4) and the cover plate (5) are connected and form a receiving cavity. The gear reduction mechanism (3) is installed in the receiving cavity.

9. A hand-cranked pencil sharpener according to claim 8, characterized in that, The tool holder connecting seat (4) is provided with a mounting post (42) adapted to the speed change gear (32), and the speed change gear (32) is rotatably mounted on the mounting post (42).

10. A hand-cranked pencil sharpener according to claim 8, characterized in that, One end of the input gear (31) passes through the cover plate (5) and connects to the rocker arm assembly (2), and one end of the tool holder assembly (1) passes through the tool holder connecting seat (4) and connects to the output gear (33).

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