An electric pencil sharpener

Abstract

This application discloses an electric pencil sharpener, including a housing and a blade holder assembly installed within the housing. The blade holder assembly contains a slidable pencil tip stop. An adjustment mechanism is installed within the housing, comprising an adjustment knob, a transmission rod, and an adjustment switch. One end of the transmission rod is connected to the adjustment knob, and the other end is connected to the adjustment switch. Force applied to the adjustment knob triggers the adjustment switch via the transmission rod. The adjustment switch is connected to the pencil tip stop, driving the pencil tip stop to slide within the blade holder assembly, thereby controlling the pencil insertion depth. The adjustment mechanism, through the transmission rod, links the adjustment knob and the adjustment switch. The design is simple and efficient, with more precise and reliable transmission, improving pencil tip adjustment efficiency.

Description

Technical Field

[0001] This application relates to the field of stationery technology, and more specifically to an electric pencil sharpener. Background Technology

[0002] Electric pencil sharpeners are common office and school supplies. They use a motor to drive blades, automatically sharpening pencils or similar writing instruments. Compared to traditional manual pencil sharpeners, they offer advantages such as saving time and effort, and providing a more even sharpening effect. Traditional electric pencil sharpeners have fixed blade positions and angles, making it impossible to adjust the sharpening depth and angle according to the user's needs. This means that regardless of the initial thickness of the pencil, the resulting tip is essentially the same thickness. In some special scenarios, such as drawing or engineering drafting, users require different tip thicknesses. Traditional electric pencil sharpeners cannot provide this flexibility; users can only roughly control the tip thickness by repeatedly trying and adjusting the depth of pencil insertion, a method that is neither precise nor convenient. For example, utility model patent CN216268403U discloses an electric pencil sharpener and a pencil tip adjustment mechanism, including a housing with a pencil inlet hole on the top wall, a pencil sharpener vertically disposed within the housing, a motor drive assembly, and a pencil tip thickness adjustment mechanism; the motor drive assembly is located below the pencil sharpener; the motor drive assembly drives the pencil sharpener to rotate; the pencil tip thickness adjustment mechanism includes a vertically movable push rod, a rotatable adjustment rod, and a reversing structure; in use, the user rotates the rotatable adjustment rod, and the reversing structure connects to the adjustment rod to convert the rotational driving action of the adjustment rod into a vertical driving action, which is transmitted to the movable push rod, further causing the movable push rod to move vertically, and the direction of movement of the movable push rod is consistent with the direction of the pencil inlet channel of the pencil sharpener, so that the upper end of the movable push rod limits the insertion depth of the pencil tip to be sharpened, thereby adjusting the thickness of the pencil tip. Although the aforementioned technical solution solves the problem that traditional electric pencil sharpeners cannot adjust the thickness of the pencil tip, the overall structural design is highly complex. Therefore, there is still a need for an electric pencil sharpener with a simple tip adjustment mechanism. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide an electric pencil sharpener in which the adjustment mechanism links the adjustment knob and the adjustment switch through a transmission rod. The structure is simple and efficient, and the transmission is more precise and reliable, thereby improving the pencil tip adjustment efficiency.

[0004] This application provides an electric pencil sharpener, including a housing and a blade holder assembly installed within the housing. The blade holder assembly has a slidable pencil tip stop. The housing is equipped with a speed adjustment mechanism, which includes an adjustment knob, a transmission rod, and a speed adjustment switch. One end of the transmission rod is connected to the adjustment knob, and the other end is throttle-connected to the speed adjustment switch. When the adjustment knob is subjected to force, it triggers the speed adjustment switch through the transmission rod. The speed adjustment switch is connected to the pencil tip stop to drive the pencil tip stop to slide within the blade holder assembly, thereby controlling the insertion depth of the pencil.

[0005] In this technical solution, the housing serves as the main structure of the electric pencil sharpener, providing support and protection for the internal components. The blade holder assembly is installed inside the housing to fix and support the blades. The pencil tip stop is slidably installed within the blade holder assembly. The pencil tip stop controls the insertion depth of the pencil through its sliding position, thereby indirectly controlling the thickness of the pencil tip. When the pencil tip stop is close to the pencil tip, the tip becomes thicker; when the pencil tip stop is away from the pencil tip, the tip becomes thinner. The transmission rod connects the adjustment knob and the gear shift switch, transmitting force. When the user operates the adjustment knob, the transmission rod converts the knob's movement into a trigger action of the gear shift switch, realizing the transmission and conversion of force. The gear shift switch receives the force transmitted by the transmission rod and, through its internal mechanical structure or electronic components, converts it into a sharpening mechanism. The adjustment signal is converted into a sliding motion of the pen tip stop, thereby adjusting the pen tip thickness. The adjustment knob is located on the outside of the housing. Users can adjust the pen tip thickness by simply rotating, flicking, or pressing. The operation is intuitive and convenient, without complicated steps. The transmission rod links the adjustment knob and the gear switch, which can directly and quickly transmit the force of the adjustment knob to the gear switch. The simple and efficient structural design can directly and quickly transmit the force of the adjustment knob to the gear switch, reducing the loss of force in the transmission process and ensuring high transmission accuracy. This makes the sliding position of the pen tip stop more accurate, and the gear adjustment mechanism is more compact, reducing the internal space occupied, which is conducive to the overall miniaturization and lightweight design of the electric pencil sharpener.

[0006] As an improvement, the gear shifting mechanism further includes a rotating rod. One end of the rotating rod is connected to the transmission rod, and the other end is connected to the gear shifting switch. When the transmission rod moves under the force of the adjustment knob, the rotating rod drives the gear shifting switch to move in the opposite direction relative to the transmission rod. In this technical solution, the rotating rod can effectively transmit the movement of the transmission rod to the gear shifting switch, using the lever principle to drive the gear shifting switch to move in the opposite direction relative to the transmission rod. That is, when the transmission rod is forced downward, the rotating rod drives the gear shifting switch to move upward, and when the transmission rod is forced upward, the rotating rod drives the gear shifting switch to move downward. On the other hand, the addition of the rotating rod allows the various components to be arranged more compactly, achieving effective motion transmission within a limited space and saving space.

[0007] As an improvement, the transmission rod is a one-piece molded long rod structure. In this technical solution, the transmission rod is manufactured using a one-piece molding process, ensuring the integrity and consistency of the transmission rod structure, reducing the number of connection points and potential failure points inside the transmission rod, making its mechanical properties more uniform and stable. The long rod structure ensures more direct and efficient force transmission, improving the transmission efficiency of the entire gear shifting mechanism.

[0008] As an improvement, the transmission rod is installed vertically inside the housing, and the adjustment knob is vertically connected to the top of the transmission rod. The adjustment knob, when subjected to force, drives the transmission rod to move vertically. In this technical solution, the transmission rod occupies vertical space inside the housing, which is particularly suitable for situations where the housing height is relatively large and the horizontal space is limited. The combination of the vertically installed transmission rod and the adjustment knob makes the entire adjustment mechanism more compact in the vertical direction, reducing the waste of internal space and providing more space for other components (such as motors, batteries, etc.), thus improving the overall space utilization of the electric pencil sharpener. When the adjustment knob is subjected to external force, the movement of the adjustment knob is directly converted into the vertical movement of the transmission rod, reducing intermediate links and improving transmission efficiency. The design of the top adjustment knob is relatively independent, making it easier for users to notice, and has little impact on the overall appearance of the machine, while also reducing the risk of misoperation.

[0009] As an improvement, the bottom of the adjustment knob is provided with a sloping guide structure. This sloping guide structure cooperates with the top of the transmission rod. When the adjustment knob is subjected to force, the sloping guide structure drives the transmission rod to move vertically. In this technical solution, when the adjustment knob is subjected to a horizontal force, the sloping guide structure decomposes this force and guides the transmission rod to move vertically, making the operation more natural and smooth. The adjustment mechanism can achieve more precise adjustment of pen tip thickness. Users can operate the adjustment knob by pushing, pulling, rotating, or pressing at an angle. The design of the sloping guide structure makes the vertical movement of the transmission rod more stable. The guiding effect of the sloping surface reduces vibration and instability during movement, allowing the transmission rod to move smoothly vertically, thereby ensuring the stability and reliability of the adjustment mechanism.

[0010] As an improvement, the housing is equipped with a slide rail structure adapted to the inclined guide structure. The inclined guide structure is connected to the slide rail structure, and passes through the top of the transmission rod connected to the slide rail structure. In this technical solution, the slide rail structure inside the housing is specifically designed for use with the inclined guide structure. The slide rail structure provides a fixed movement path for the adjustment knob, ensuring its stability and accuracy. The design of the slide rail structure allows the inclined guide structure to accurately transmit the force of the adjustment knob to the transmission rod, reducing errors caused by inconsistent force directions and improving the accuracy of pen tip thickness adjustment.

[0011] As an improvement, the transmission rod is connected to an elastic element, which keeps the transmission rod in contact with the adjustment knob. The housing contains a mounting base adapted to the elastic element; one end of the elastic element is connected to the mounting base, and the other end is connected to the transmission rod. In this technical solution, the elastic element keeps the transmission rod in contact with the adjustment knob, ensuring that the force of the adjustment knob is effectively transmitted to the transmission rod, improving the overall transmission efficiency of the adjustment mechanism, ensuring the accuracy of the pen tip thickness adjustment, and providing necessary elastic reset support so that the transmission rod can automatically reset when no other force is applied. The mounting base provides a stable support point for the elastic element, ensuring its stability and reliability during operation.

[0012] As an improvement, the top of the housing is provided with a first opening adapted to the adjustment knob, and the top of the adjustment knob extends through the first opening for force application. In this technical solution, the top of the adjustment knob extends outside the housing through the first opening, allowing the user to directly apply force to the adjustment knob, making the operation simpler and more intuitive. The housing can be equipped with multiple gear positions adapted to the adjustment mechanism, allowing the user to achieve precise adjustment by operating the adjustment knob to each position. The operating part of the adjustment knob is located on the top of the housing, which reduces the probability of user error and ensures the stability and accuracy of the pencil sharpening process.

[0013] As an improvement, the adjustment switch includes a switch and an adjusting rod connected vertically. The adjustment switch is connected to the other end of the rotating rod via the switch, and the adjustment switch is connected to the pen tip stop via the adjusting rod. In this technical solution, the adjustment switch, through the cooperation of the switch and the adjusting rod, can accurately transmit the movement of the rotating rod to the pen tip stop, making the sliding of the pen tip stop more accurate, thereby achieving more precise pen tip thickness adjustment. The vertically connected switch and adjusting rod ensure that the direction and magnitude of the force transmission are more concentrated and stable, reducing vibration and instability caused by inconsistent force directions.

[0014] As an improvement, a chip box is also included. The housing is detachably connected to the chip box. The housing has a second opening for connecting the tool holder assembly and the chip box. When the housing is subjected to force, the tool holder assembly can be simultaneously inserted into or detached from the chip box. In this technical solution, the chip box is fitted outside the housing. The chip box and the tool holder assembly are connected through the second opening on the housing. The chips generated after the tool holder assembly sharpens the pencil are discharged into the chip box through the second opening. The detachable connection design allows the housing to be detached from or inserted into the chip box. The tool holder assembly and other components form an integral unit with the housing. The tool holder assembly and other components can be detached from or inserted into the chip box as a whole through the housing, which facilitates cleaning and chip emptying operations, reduces operation steps, and makes disassembly and assembly more convenient. On the other hand, the detachable connection method includes, but is not limited to, elastic clips and rotary clips. Elastic clips are a common detachable connection method that uses the deformation of elastic materials to fix and disassemble components, making disassembly and assembly faster. Rotary clips are a connection method that uses rotation to fix and disassemble components, offering higher stability and reliability. This application prefers the rotary clip detachable connection method, making the overall connection more reliable. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of an electric pencil sharpener according to this application.

[0016] Figure 2 This is an exploded view of a portion of the structure of the electric pencil sharpener described in this application.

[0017] Figure 3 This is a schematic diagram of the connection structure between the file adjustment mechanism and the tool holder assembly in this application.

[0018] Figure 4 This is a schematic diagram of the connection structure between the adjusting knob and the transmission rod in this application.

[0019] Figure 5 This is an exploded view of the housing and chip box of this application.

[0020] The figure shows: 1. Housing; 11. Slide rail structure; 12. First opening; 13. Second opening; 2. Tool holder assembly; 21. Pen tip stop; 3. Gear adjustment mechanism; 31. Adjustment knob; 311. Angled guide structure; 32. Transmission rod; 33. Gear adjustment switch; 331. Switch; 332. Adjustment rod; 34. Rotating rod; 35. Elastic element; 4. Chip box. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Furthermore, it should be noted that the terms "installation," "setting," "equipped with," "connection," and "linking" 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.

[0025] like Figures 1 to 5 As shown, this application discloses an electric pencil sharpener, including a housing 1 and a blade holder assembly 2 installed inside the housing 1. The blade holder assembly 2 has a slidable pencil tip stop 21. The housing 1 serves as the main structure of the electric pencil sharpener, playing a role in installing, supporting, and protecting the internal components. The blade holder assembly 2 is installed inside the housing 1 to fix and support the blade. The pencil tip stop 21 is slidably installed inside the blade holder assembly 2. The pencil tip stop 21 controls the insertion depth of the pencil by its sliding position, thereby indirectly controlling the thickness of the pencil tip. When the pencil tip stop 21 is close to the pencil tip, the pencil tip becomes thicker; when the pencil tip stop 21 is away from the pencil tip, the pencil tip becomes thinner.

[0026] More specifically, such as Figures 2 to 4As shown, a gear shifting mechanism 3 is installed inside the housing 1. The gear shifting mechanism 3 includes an adjustment knob 31, a transmission rod 32, and a gear shifting switch 33. One end of the transmission rod 32 is connected to the adjustment knob 31, and the other end is connected to the gear shifting switch 33. When the adjustment knob 31 is subjected to force, it triggers the gear shifting switch 33 through the transmission rod 32. The gear shifting switch 33 is connected to the pen tip stop 21 to drive the pen tip stop 21 to slide. The transmission rod 32 connects the adjustment knob 31 and the gear shifting switch 33, and plays the role of transmitting force. When the user operates the adjustment knob 31, the transmission rod 32 converts the movement of the adjustment knob 31 into the triggering action of the gear shifting switch 33, realizing the transmission and conversion of force. The gear shifting switch 33 receives the force transmitted by the transmission rod 32 and converts the adjustment signal into an adjustment signal through the internal mechanical structure or electronic components. The sliding motion of the pen tip stop 21 allows for adjustment of the pen tip thickness. The adjustment knob 31 is located outside the housing 1. Users can adjust the pen tip thickness through simple rotation, flicking, or pressing actions. The operation is intuitive and convenient, requiring no complicated steps. The transmission rod 32 links the adjustment knob 31 and the gear shift switch 33, enabling the force of the adjustment knob 31 to be directly and quickly transmitted to the gear shift switch 33. The structural design is simple and efficient, enabling the force of the adjustment knob 31 to be directly and quickly transmitted to the gear shift switch 33, reducing the loss of force during transmission, ensuring high transmission accuracy, making the sliding position of the pen tip stop 21 more accurate, and making the gear shift mechanism 3 more compact, reducing the internal space occupied, which is conducive to the overall miniaturization and lightweight design of the electric pencil sharpener.

[0027] More specifically, such as Figure 2 and Figure 3 As shown, the gear shifting mechanism 3 also includes a rotating rod 34. One end of the rotating rod 34 is connected to the transmission rod 32, and the other end is connected to the gear shifting switch 33. When the transmission rod 32 moves under the force of the adjusting knob 31, the rotating rod 34 drives the gear shifting switch 33 to move in the opposite direction relative to the transmission rod 32. The rotating rod 34 can effectively transmit the movement of the transmission rod 32 to the gear shifting switch 33, using the lever principle to drive the gear shifting switch 33 to move in the opposite direction relative to the transmission rod 32. That is, when the transmission rod 32 is forced to move downward, the rotating rod 34 drives the gear shifting switch 33 to move upward, and when the transmission rod 32 is forced to move upward, the rotating rod 34 drives the gear shifting switch 33 to move downward. On the other hand, the addition of the rotating rod 34 allows the various components to be arranged more compactly, achieving effective motion transmission in a limited space and saving space.

[0028] More specifically, such as Figures 2 to 4As shown, the transmission rod 32 is a one-piece molded long rod structure. The transmission rod 32 is manufactured using a one-piece molding process, which ensures the integrity and consistency of the transmission rod 32 in terms of structure, reduces the connection points and potential failure points inside the transmission rod 32, and makes its mechanical properties more uniform and stable. The long rod structure can ensure that the force transmission is more direct and efficient, and improves the transmission efficiency of the entire gear shifting mechanism 3.

[0029] More specifically, such as Figures 2 to 4 As shown, the transmission rod 32 is vertically installed inside the housing 1, and the adjustment knob 31 is vertically connected to the top of the transmission rod 32. The adjustment knob 31 drives the transmission rod 32 to move vertically when it is subjected to force. The transmission rod 32 occupies vertical space inside the housing 1, which is especially suitable for situations where the height of the housing 1 is relatively large and the horizontal space is limited. The combination of the vertically installed transmission rod 32 and the adjustment knob 31 makes the layout of the entire adjustment mechanism 3 more compact in the vertical direction, reducing the waste of internal space and providing more space for other components (such as motors, batteries, etc.), thus improving the overall space utilization of the electric pencil sharpener. When the adjustment knob 31 is subjected to external force, the movement of the adjustment knob 31 is directly converted into the vertical movement of the transmission rod 32, reducing intermediate links and improving transmission efficiency. The design of the top adjustment knob 31 is relatively independent, making it easier for users to notice, and has little impact on the appearance of the whole machine, while also reducing the risk of misoperation.

[0030] More specifically, such as Figure 4 As shown, the bottom of the adjustment knob 31 is provided with a sloping guide structure 311. The sloping guide structure 311 cooperates with the top of the transmission rod 32. When the adjustment knob 31 is subjected to force, it drives the transmission rod 32 to move vertically through the sloping guide structure 311. When the adjustment knob 31 is subjected to a horizontal force, the sloping guide structure 311 will decompose this force and guide the transmission rod 32 to move vertically, making the operation process more natural and smooth. The adjustment mechanism 3 can achieve more precise adjustment of pen tip thickness. Users can operate the adjustment knob 31 by pushing, pulling, rotating or pressing at an angle. The design of the sloping guide structure 311 makes the vertical movement of the transmission rod 32 more stable. The guiding effect of the sloping surface reduces the shaking and instability during the movement, allowing the transmission rod 32 to move smoothly vertically, thereby ensuring the stability and reliability of the adjustment mechanism 3.

[0031] More specifically, such as Figures 2 to 4As shown, the housing 1 is provided with a slide rail structure 11 adapted to the inclined guide structure 311. The inclined guide structure 311 is connected to the slide rail structure 11. The inclined guide structure 311 passes through the slide rail structure 11 and connects to the top of the transmission rod 32. The slide rail structure 11 is provided in the housing 1 specifically for use with the inclined guide structure 311. The slide rail structure 11 provides a fixed movement path for the adjustment knob 31, ensuring the stability and accuracy of its movement. The design of the slide rail structure 11 enables the inclined guide structure 311 to accurately transmit the force of the adjustment knob 31 to the transmission rod 32, reducing the error caused by inconsistent force direction and improving the accuracy of pen tip thickness adjustment.

[0032] More specifically, such as Figure 2 and Figure 3 As shown, the transmission rod 32 is connected to an elastic element 35, which is used to keep the transmission rod 32 in contact with the adjusting knob 31. The housing 1 is provided with a mounting base adapted to the elastic element 35. One end of the elastic element 35 is connected to the mounting base, and the other end of the elastic element 35 is connected to the transmission rod 32. The function of the elastic element 35 is to keep the transmission rod 32 in contact with the adjusting knob 31, ensuring that the force of the adjusting knob 31 can be effectively transmitted to the transmission rod 32, improving the overall transmission efficiency of the adjustment mechanism 3, ensuring the accuracy of the pen tip thickness adjustment, and at the same time, the elastic element 35 provides the necessary elastic reset support, so that the transmission rod 32 can automatically reset when there is no other force. The mounting base provides a stable support point for the elastic element 35, ensuring the stability and reliability of the elastic element 35 during operation.

[0033] More specifically, such as Figure 1 , Figure 2 and Figure 5 As shown, the top of the housing 1 is provided with a first opening 12 that is adapted to the adjustment knob 31. The top of the adjustment knob 31 extends through the first opening 12 for force application. The top of the adjustment knob 31 extends outside the housing 1 through the first opening 12, and the user can directly apply force to the adjustment knob 31, making the operation process simpler and more intuitive. Multiple gear positions that are adapted to the gear adjustment mechanism 3 can be set on the housing 1. The user can achieve precise adjustment by operating the adjustment knob 31 to each gear position. The operation part of the adjustment knob 31 is located on the top of the housing 1, which can reduce the probability of user misoperation and ensure the stability and accuracy of the pencil sharpening process.

[0034] More specifically, such as Figure 2 and Figure 3As shown, the adjustment switch 33 includes a switch 331 and an adjustment rod 332 connected vertically. The adjustment switch 33 is connected to the other end of the rotating rod 34 through the switch 331, and the adjustment switch 33 is connected to the pen tip stop block 21 through the adjustment rod 332. Through the cooperation of the switch 331 and the adjustment rod 332, the adjustment switch 33 can accurately transmit the movement of the rotating rod 34 to the pen tip stop block 21, making the sliding of the pen tip stop block 21 more accurate, thereby achieving more precise pen tip thickness adjustment. Through the vertical connection of the switch 331 and the adjustment rod 332, the direction and magnitude of the force transmission are more concentrated and stable, reducing the shaking and instability caused by inconsistent force directions.

[0035] More specifically, such as Figure 1 and Figure 5 As shown, it also includes a chip box 4. The housing 1 and the chip box 4 are detachably connected. The housing 1 has a second opening 13 for connecting the tool holder assembly 2 and the chip box 4. When the housing 1 is subjected to force, it can drive the tool holder assembly 2 to simultaneously insert into or detach from the chip box 4. The chip box 4 is fitted outside the housing 1. The chip box 4 and the tool holder assembly 2 are connected through the second opening 13 on the housing 1. The chips generated after the tool holder assembly 2 sharpens the tool are discharged into the chip box 4 through the second opening 13. The detachable connection design allows the housing 1 to detach from or insert into the chip box 4. The tool holder assembly 2 and other components form a whole with the housing 1. The frame assembly 2 and other components can be detached from or inserted into the chip box 4 through the housing 1, which facilitates cleaning and chip emptying operations, reduces operation steps, and makes disassembly and assembly more convenient. On the other hand, the detachable connection method includes, but is not limited to, elastic buckles and rotary buckles. Elastic buckles are a common detachable connection method, which uses the deformation of elastic materials to fix and disassemble components, making disassembly and assembly faster. Rotary buckles are a connection method that uses rotation to fix and disassemble components, which has higher stability and reliability. This application prefers the detachable connection method of rotary buckles, which makes the connection of the whole machine more reliable.

[0036] 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. An electric pencil sharpener, comprising a housing (1) and a blade holder assembly (2) installed within the housing (1), wherein the blade holder assembly (2) is provided with a slidable pencil tip stop (21), characterized in that, The housing (1) is equipped with a gear adjustment mechanism (3). The gear adjustment mechanism (3) includes an adjustment knob (31), a transmission rod (32), and a gear adjustment switch (33). One end of the transmission rod (32) is connected to the adjustment knob (31), and the other end of the transmission rod (32) is connected to the gear adjustment switch (33). The adjustment knob (31) is subjected to force and triggers the gear adjustment switch (33) through the transmission rod (32). The gear adjustment switch (33) is connected to the pen tip stop (21) to drive the pen tip stop (21) to slide in the pencil holder assembly (2), thereby controlling the insertion depth of the pencil.

2. The electric pencil sharpener according to claim 1, characterized in that, The gear shifting mechanism (3) further includes a rotating rod (34), one end of which is connected to the transmission rod (32), and the other end of which is connected to the gear shifting switch (33). When the transmission rod (32) is moved by the force of the adjusting knob (31), the rotating rod (34) drives the gear shifting switch (33) to move in the opposite direction relative to the transmission rod (32).

3. An electric pencil sharpener according to claim 1 or 2, characterized in that, The transmission rod (32) is a one-piece molded long rod structure.

4. An electric pencil sharpener according to claim 1 or 2, characterized in that, The transmission rod (32) is installed vertically inside the housing (1), and the adjustment knob (31) is connected vertically to the top of the transmission rod (32). The adjustment knob (31) drives the transmission rod (32) to move vertically when it is subjected to force.

5. An electric pencil sharpener according to claim 4, characterized in that, The bottom of the adjustment knob (31) is provided with a sloping guide structure (311), which cooperates with the top of the transmission rod (32). When the adjustment knob (31) is moved by force, the transmission rod (32) is driven to move vertically through the sloping guide structure (311).

6. An electric pencil sharpener according to claim 5, characterized in that, The housing (1) is provided with a slide rail structure (11) adapted to the inclined guide structure (311). The inclined guide structure (311) is connected to the slide rail structure (11). The inclined guide structure (311) passes through the top of the transmission rod (32) connected to the slide rail structure (11).

7. An electric pencil sharpener according to claim 4, characterized in that, The transmission rod (32) is connected to an elastic element (35), which is used to keep the transmission rod (32) in contact with the adjusting knob (31); the housing (1) is provided with a mounting seat that is adapted to the elastic element (35), one end of the elastic element (35) is connected to the mounting seat, and the other end of the elastic element (35) is connected to the transmission rod (32).

8. An electric pencil sharpener according to claim 4, characterized in that, The top of the housing (1) is provided with a first opening (12) adapted to the adjustment knob (31), and the top of the adjustment knob (31) extends through the first opening (12) for force application operation.

9. An electric pencil sharpener according to claim 2, characterized in that, The gear shift switch (33) includes a switch (331) and an adjusting rod (332) connected vertically. The gear shift switch (33) is connected to the other end of the rotating rod (34) through the switch (331). The gear shift switch (33) is connected to the pen tip stop block (21) through the adjusting rod (332).

10. An electric pencil sharpener according to claim 1, characterized in that, It also includes a chip box (4), the housing (1) and the chip box (4) are detachably connected, the housing (1) is provided with a second opening (13), the second opening (13) is used to connect the tool holder assembly (2) and the chip box (4), the housing (1) can be driven by force to simultaneously insert the tool holder assembly (2) into the chip box (4) or detach from the chip box (4).

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