A pencil sharpener

Abstract

This application discloses a pencil sharpener, including a housing and a blade assembly installed within the housing. The housing has a pencil inlet for inserting a pencil into the blade assembly. The pencil inlet is located at the rotation center of the housing. At least two seals are movably installed within the housing. The at least two seals are rotationally symmetrically distributed around the pencil inlet. The at least two seals can be moved relatively far apart to open the pencil inlet or relatively close together to close it when subjected to force. By placing the pencil inlet at the rotation center and equipping it with multiple movable seals that are rotationally symmetrical around the pencil inlet, the stability and consistency of the pencil sharpening effect are improved.

Description

Technical Field

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

[0002] A pencil sharpener is a common stationery item, primarily used to sharpen pencil leads for easier writing and drawing. Traditional pencil sharpeners typically consist of a fixed base and a blade. The blade rotates relative to the inserted pencil to remove the outer wood layer, exposing the lead and sharpening it. In the pencil sharpener's design, the inlet is a crucial component, providing a channel for the pencil to enter the sharpening assembly and ensuring accurate entry into the sharpening area. During sharpening, the relative movement of the blade and pencil generates a large amount of shavings. Because the inlet is open and lacks an effective sealing and blocking mechanism, the shavings cannot be properly collected and contained. Under the cutting force, the shavings often leak out through the inlet, increasing the difficulty of cleaning and potentially contaminating stored items, affecting their cleanliness and lifespan. To address the aforementioned issues, Chinese utility model patent CN202573548U discloses an environmentally friendly pencil sharpener, which includes a barrel, a lid, a double-opening sliding door device, a top cover, and a blade holder. The lid has a pencil insertion port, and the blade holder is located below the lid. The lid can cover the barrel and conceal the blade holder inside the barrel. The double-opening sliding door device includes a double-opening sliding door and a spring. The double-opening sliding door consists of two symmetrically arranged sliding plates on the lid. One end of each sliding plate is movably connected to the lid via a shaft. The spring is located between the sliding plates and the inner edge of the lid, and is partially concealed within a strip groove on the lid. The two sliding plates can rotate around the shaft to open / close the double-opening sliding door. The top cover is located above the lid and covers the double-opening sliding door device. The top cover has a pencil insertion port corresponding to the pencil insertion port on the lid. The double-opening sliding door is close to the top cover, and its center corresponding to the pencil insertion port on the top cover has a conical recess. In the aforementioned technical solution, the double sliding door keeps the pencil holder on the top cover in a normally closed state. When sharpening a pencil, the pencil tip is gently pressed against the conical recess of the double sliding door to open it for sharpening. At this time, the spring is in a compressed state. After the pencil is removed, the spring extends, closing the double sliding door and restoring the pencil holder on the top cover to a closed state, thus solving the problem of pencil shavings leaking out in the traditional solution. However, as can be seen from the attached diagram, the pencil holder on the top cover is off-center from the center of the machine, which causes uneven stress on the entire pencil sharpener, affecting its structural stability. Furthermore, it feels unnatural to the user and does not meet the expectations of general users' pencil sharpener usage habits. In addition, the off-center design results in low space utilization of the entire machine. On the other hand, for commonly used ratchet-type pencil sharpeners, which rely on a ratchet mechanism to achieve automatic rotation and advance of the pencil, if the pencil insertion port is off-center, the position and function of the ratchet will be limited. Furthermore, the ratchet needs to be precisely aligned with the axis of the pencil to ensure that the pencil can rotate and advance smoothly. However, an off-center pencil insertion port may cause the ratchet to fail to properly contact the pencil, thus affecting the pencil sharpening effect. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a pencil sharpener in which the pencil inlet is placed at the center of rotation and equipped with multiple movable seals that are symmetrically arranged around the pencil inlet, thereby improving the stability and consistency of the pencil sharpening effect.

[0004] This application provides a pencil sharpener, including a housing and a core assembly installed inside the housing. The housing is provided with a pen inlet for a pencil to pass through into the core assembly. The pen inlet is located at the rotation center of the housing. At least two seals are movably installed inside the housing. The at least two seals are distributed in a rotationally symmetrical manner around the pen inlet. The at least two seals can be moved away from each other to open the pen inlet or moved closer together to close the pen inlet when subjected to force.

[0005] In this technical solution, the housing serves to support and protect the internal components, providing a stable structural foundation for the pencil sharpener. The pencil inlet is positioned at the center of rotation of the housing, ensuring uniform force on the pencil during insertion and sharpening, and highly coordinated with the rotational movement of the housing. This provides precise positioning and stable mechanical support for the sharpening operation. The central design of the inlet allows for more efficient use of the internal space of the pencil sharpener. For ratchet-type pencil sharpeners, the inlet's central position ensures precise alignment between the ratchet mechanism and the pencil's axis, allowing for smooth contact between the ratchet and the pencil, achieving automatic rotation and advancement of the pencil. This improves the stability and consistency of the sharpening effect. Multiple seals are arranged in a rotationally symmetrical distribution around the inlet, meaning that after rotating the entire layout by a specific angle around the inlet, the layout remains consistent with the initial design. The identical state allows multiple seals to move synchronously and evenly towards the pencil inlet, achieving a smooth and well-sealed closure. Furthermore, the force is rotationally symmetrically distributed around the pencil inlet, which is beneficial for structural stability, reducing off-center loading and wear. The rotationally symmetrical design also efficiently utilizes the annular space around the pencil inlet, making it particularly suitable for circular inlets. The seals can be positioned relatively close or far apart to control the opening and closing of the inlet. During sharpening, when the pencil is inserted, the seals automatically move away from each other, providing space for insertion and rotation. When the pencil is removed, the seals, under their own elasticity or the action of a reset mechanism, move closer together, quickly closing the pencil inlet and preventing shavings from leaking out. This automated opening and closing mechanism not only improves the ease of use of the pencil sharpener but also greatly enhances its sealing performance and anti-contamination capabilities.

[0006] As an improvement, the sealing element is connected to a reset elastic element. At least two of the sealing elements are relatively separated by the force of the pencil insertion to open the pencil inlet, and at least two of the sealing elements are relatively close together by the force of the reset elastic element to close the pencil inlet. In this technical solution, the reset elastic element is a component capable of generating elastic restoring force, usually made of a spring or other elastic material. It is connected to the sealing element and provides power support for the movement of the sealing element. During the use of the pencil sharpener, the movement of the sealing element is controlled by two forces. When the pencil is inserted into the pencil inlet, the force applied by the pencil overcomes the elastic resistance of the reset elastic element, causing at least two sealing elements to move relatively apart, thereby opening the pencil inlet. When the pencil is pulled out, the force generated by the reset elastic element causes the sealing elements to move relatively closer, quickly closing the pencil inlet, thus achieving an automated sealing function. The coordinated work of the sealing element and the reset elastic element achieves the closure of the pencil inlet without manual intervention, improving the ease of use of the pencil sharpener.

[0007] As an improvement, a bracket adapted to the seal is installed inside the housing. A rotating shaft is provided on the bracket, and the seal is connected to the rotating shaft for rotatable mounting on the bracket. In this technical solution, the bracket is fixed inside the housing, providing a stable support foundation for the movement of the seal. The structure and dimensions of the bracket are adapted to the seal, ensuring that the seal can be accurately mounted on the bracket and can perform predetermined movements under the constraint of the bracket, improving the stability and reliability of the seal. The rotating shaft on the bracket allows the seal to have a through hole adapted to the rotating shaft. The rotatable mounting method allows the seal to rotate flexibly around the rotating shaft during pencil insertion and removal, realizing the opening and closing of the pencil inlet. The rotating shaft not only provides a stable fulcrum for the movement of the seal but also ensures the smoothness and consistency of the seal's movement.

[0008] As an improvement, the sealing element is provided with a conical recess that matches the pen inlet, and the conical recess guides the insertion of the pen tip. In this technical solution, the position of the conical recess matches the pen inlet, which not only guides the pen tip insertion but also better pushes open the sealing element during insertion, ensuring that the pen inlet can open smoothly. The conical recess can form a good contact and guiding relationship with the pen tip, making the opening and closing action of the sealing element smoother and more natural, reducing resistance during insertion. Users can insert pencils more easily and accurately without repeatedly adjusting the angle and position of the pencil, thus improving the convenience of insertion.

[0009] As an improvement, the seal is provided with a recessed area that engages with the conical recess. The recessed area is located on the side near the pivot, while the conical recess is located on the side away from the pivot. In this technical solution, the conical recess is located on the side away from the pivot and is used to contact the pen tip and guide its insertion. The recessed area is located on the side near the pivot and is used to avoid force during pen insertion, ensuring that the seal can rotate smoothly. The seal opens and closes the pen inlet by rotating around the pivot. The design of the recessed area essentially eliminates contact and force at the near-pivot end, reduces the multi-directional forces on the seal during pencil insertion, and avoids difficulty in rotating the seal due to uneven force. When the pencil is inserted, the force only acts on the conical recess at the far-pivot end. The lever arm here is long, and the direction of the generated torque is consistent with the direction of the seal opening, which can efficiently drive the seal to rotate and open. This makes the user's pencil insertion action exceptionally light and smooth, and the design is simple and ingenious.

[0010] As an improvement, a limiting structure is provided on the bracket. This limiting structure abuts against the seal to restrict the rotation range of the seal. In this technical solution, the main function of the limiting structure is to abut against the seal, thereby limiting the rotation range of the seal. Specifically, the limiting structure is a protrusion on the bracket that abuts against the side wall of the seal, which can precisely control the reset position of the seal, accurately close the pen inlet, and improve the reliability of the pencil sharpener.

[0011] As an improvement, the bracket is provided with an arc-shaped guide section adapted to the seal, which is used to guide the rotation of the seal. In this technical solution, the shape of the arc-shaped guide section is adapted to the movement trajectory of the seal, ensuring that the seal can move along a predetermined path during rotation. The seal can reach the predetermined position more smoothly and accurately during rotation, whether opening or closing the inlet, thus improving structural stability.

[0012] As an improvement, the bracket is provided with a mounting groove for mounting a reset elastic element. One end of the reset elastic element abuts against the inner wall of the mounting groove, and the other end of the reset elastic element is connected to the seal. In this technical solution, the mounting groove provides a fixed and installed position for the reset elastic element, ensuring that the reset elastic element can provide stable elastic force during the movement of the seal, reducing the risk of failure caused by the seal not being properly reset, and improving the overall reliability of the seal.

[0013] As an improvement, the mounting groove has an arc-shaped structure, and a connecting post is provided on the side wall of the seal. The connecting post is sleeved with the other end of the reset elastic element. In this technical solution, the arc-shaped mounting groove is adapted to the rotation trajectory of the seal, ensuring that the reset elastic element can be stably supported during the rotation of the seal. This reduces the additional stress on the reset elastic element during operation, improving its service life and reliability. The sleeved connection between the connecting post and the reset elastic element provides a stable and reliable connection, ensuring that the reset elastic element will not loosen or fall off when transmitting elastic force, thereby guaranteeing the stability and reliability of the seal's automatic reset function.

[0014] As an improvement, the housing includes a first housing and a second housing, which are detachably connected. The seal is installed between the first and second housings, and the pen inlet is located on the second housing. In this technical solution, the detachable connection design allows the first and second housings to be easily separated, greatly facilitating installation and maintenance. The seal, installed between the two housings, ensures stability during operation. The pen inlet on the second housing provides a clear positioning for the pencil insertion and aligns with the seal's installation position, ensuring smooth opening of the seal when the pencil is inserted. Attached Figure Description

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

[0016] Figure 2 This is an exploded structural diagram of a pencil sharpener according to this application.

[0017] Figure 3 This is a partial structural diagram of the pencil sharpener's seal in the closed state in this application.

[0018] Figure 4 This is a top view of the pencil sharpener with the seal open in this application.

[0019] The figure shows: 1. Housing; 11. First housing; 12. Second housing; 121. Pen inlet; 2. Knife core assembly; 3. Seal; 31. Conical recess; 32. Clearance recess; 33. Connecting post; 4. Reset elastic element; 5. Bracket; 51. Rotating shaft; 52. Limiting structure; 53. Arc-shaped guide section; 54. Mounting groove. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] like Figures 1 to 4As shown, this application discloses a pencil sharpener, including a housing 1 and a core assembly 2 installed inside the housing 1. The housing 1 is provided with a pencil inlet 121 for the pencil to pass through and enter the core assembly 2. The pencil inlet 121 is located at the rotation center of the housing 1. The housing 1 serves to support and protect the internal components, providing a stable structural foundation for the pencil sharpener. The location of the pencil inlet 121 at the rotation center of the housing 1 ensures that the pencil is subjected to uniform force during insertion and sharpening, and is highly coordinated with the rotational movement of the housing 1, providing precise positioning and stable mechanical support for the sharpening operation. The central design of the pencil inlet 121 allows for more rational use of the internal space of the pencil sharpener. For ratchet-type pencil sharpeners, the location of the pencil inlet 121 at the rotation center ensures that the ratchet mechanism is precisely aligned with the axis of the pencil, allowing the ratchet to smoothly contact the pencil, realizing the automatic rotation and advancement of the pencil, and improving the stability and consistency of the sharpening effect.

[0025] More specifically, such as Figures 2 to 4 As shown, at least two seals 3 are movably installed inside the housing 1. These seals 3 are rotationally symmetrically distributed around the pen inlet 121. The forces acting on the seals 3 can be directed to either open or close the pen inlet 121 by moving them relatively apart. This rotational symmetrical distribution of multiple seals 3 around the pen inlet 121 ensures that the entire layout remains the same after rotating it around the pen inlet 121 by a specific angle. This allows the seals 3 to move synchronously and uniformly towards the pen inlet 121, achieving a smooth and well-sealed closure. Furthermore, the rotational symmetrical distribution of forces around the pen inlet 121 contributes to structural stability and reduces off-center loading. The wear-resistant and rotationally symmetrical design efficiently utilizes the annular space around the pencil inlet 121, making it particularly suitable for circular pencil inlets 121. The sealing element 3 can be positioned relatively close to or far away from the pencil inlet 121 to open and close it. During pencil sharpening, when the pencil is inserted, the sealing element 3 automatically moves away from the pencil, providing space for insertion and rotation. When the pencil is removed, the sealing element 3 moves closer to the pencil inlet 121 under its own elasticity or the action of the reset mechanism, quickly closing the pencil inlet 121 to prevent shavings from leaking out. This automated opening and closing mechanism not only improves the ease of use of the pencil sharpener but also greatly enhances its sealing performance and anti-pollution capabilities.

[0026] More specifically, such as Figures 2 to 4As shown, the sealing element 3 is connected to the reset elastic element 4. At least two sealing elements 3 are relatively far apart under the force of the pencil insertion to open the pencil inlet 121, and at least two sealing elements 3 are relatively close together under the force of the reset elastic element 4 to close the pencil inlet 121. The reset elastic element 4 is a component that can generate elastic restoring force, usually made of spring or other elastic materials. It is connected to the sealing element 3 and provides power support for the movement of the sealing element 3. During the use of the pencil sharpener, the movement state of the sealing element 3 is controlled by two forces. When the pencil is inserted into the pencil inlet 121, the force applied by the pencil overcomes the elastic resistance of the reset elastic element 4, causing at least two sealing elements 3 to move relatively far apart, thereby opening the pencil inlet 121. When the pencil is pulled out, the force generated by the reset elastic element 4 will cause the sealing elements 3 to move relatively close together, quickly closing the pencil inlet 121, realizing an automated sealing function. The cooperative work of the sealing element 3 and the reset elastic element 4 realizes the closure of the pencil inlet 121 without manual intervention, improving the ease of use of the pencil sharpener.

[0027] More specifically, such as Figures 2 to 4 As shown, a bracket 5 adapted to the seal 3 is installed inside the housing 1. A rotating shaft 51 is provided on the bracket 5. The seal 3 is connected to the rotating shaft 51 and is rotatably mounted on the bracket 5. The bracket 5 is fixed inside the housing 1, providing a stable support base for the movement of the seal 3. The structure and size of the bracket 5 are adapted to the seal 3, ensuring that the seal 3 can be accurately installed on the bracket 5 and can perform a predetermined movement under the constraint of the bracket 5, thereby improving the stability and reliability of the seal 3. The rotating shaft 51 is provided on the bracket 5, and the seal 3 can be provided with a through hole adapted to the rotating shaft 51. The rotatable installation method allows the seal 3 to rotate flexibly around the rotating shaft 51 during the insertion and removal of the pencil, realizing the opening and closing action of the pencil inlet 121. The setting of the rotating shaft 51 not only provides a stable fulcrum for the movement of the seal 3, but also ensures the smoothness and consistency of the movement of the seal 3.

[0028] More specifically, such as Figure 3 and Figure 4 As shown, the seal 3 is provided with a conical recess 31 that matches the pen inlet 121. The conical recess 31 is used to guide the pen tip insertion. The position of the conical recess 31 matches the pen inlet 121. It not only guides the pen tip insertion, but also pushes the seal 3 open better during the insertion process, ensuring that the pen inlet 121 can open smoothly. The conical recess 31 can form a good contact and guiding relationship with the pen tip, making the opening and closing action of the seal 3 smoother and more natural, reducing the resistance during insertion. Users can insert the pencil more easily and accurately without repeatedly adjusting the angle and position of the pencil, thus improving the convenience of insertion.

[0029] More specifically, such as Figure 3 and Figure 4 As shown, the seal 3 is provided with a clearance recess 32 that engages with the conical recess 31. The clearance recess 32 is located on the side near the rotating shaft 51, while the conical recess 31 is located on the side away from the rotating shaft 51. The conical recess 31, located on the side away from the rotating shaft 51, is used to contact the pen tip and guide its insertion. The clearance recess 32, located on the side near the rotating shaft 51, is used to prevent force during pen insertion, ensuring that the seal 3 can rotate smoothly. The seal 3 opens and closes the pen inlet 1 by rotating around the rotating shaft 51. 21. The design of the recessed part 32 essentially eliminates the contact and force at the near-axis end, reduces the multi-directional force on the seal 3 during pencil insertion, and avoids the difficulty of rotating the seal 3 due to uneven force. When the pencil is inserted, the force is only applied to the conical recessed part 31 at the far-axis end. The lever arm here is long, and the direction of the torque generated is consistent with the direction of opening of the seal 3, which can efficiently drive the seal 3 to rotate and open. This makes the user's pencil insertion action exceptionally light and smooth. The design is simple and ingenious.

[0030] More specifically, such as Figure 3 and Figure 4 As shown, a limiting structure 52 is provided on the bracket 5. The limiting structure 52 is used to abut against the seal 3 to limit the rotation range of the seal 3. The main function of the limiting structure 52 is to abut against the seal 3. Through this abutment relationship, the rotation range of the seal 3 is limited. Specifically, the limiting structure 52 is a protrusion on the bracket 5, which is used to abut against the side wall of the seal 3. It can accurately control the reset position of the seal 3, accurately close the pen inlet 121, and improve the reliability of the pencil sharpener.

[0031] More specifically, such as Figure 3 and Figure 4 As shown, the bracket 5 is provided with an arc-shaped guide section 53 adapted to the seal 3. The arc-shaped guide section 53 is used to guide the rotation of the seal 3. The shape of the arc-shaped guide section 53 is adapted to the movement trajectory of the seal 3, ensuring that the seal 3 can move along the predetermined path during rotation. The seal 3 can reach the predetermined position more smoothly and accurately during rotation, whether opening or closing the pen inlet 121, thus improving the structural stability.

[0032] More specifically, such as Figure 3 and Figure 4 As shown, the bracket 5 is provided with a mounting groove 54, which is used to install the reset elastic element 4. One end of the reset elastic element 4 abuts against the inner wall of the mounting groove 54, and the other end of the reset elastic element 4 is connected to the seal 3. The mounting groove 54 provides a fixed and installed position for the reset elastic element 4, ensuring that the reset elastic element 4 can provide stable elastic force during the movement of the seal 3, reducing the risk of failure caused by the seal 3 not being properly reset, and improving the reliability of the entire seal 3.

[0033] More specifically, such as Figure 3 and Figure 4 As shown, the mounting groove 54 has an arc-shaped structure, and the side wall of the seal 3 is provided with a connecting post 33. The connecting post 33 is sleeved with the other end of the reset elastic element 4. The mounting groove 54 has an arc-shaped structure, which is adapted to the rotation trajectory of the seal 3, ensuring that the reset elastic element 4 can be stably supported during the rotation of the seal 3. This reduces the additional stress on the reset elastic element 4 during operation, improves its service life and reliability, and the sleeved connection between the connecting post 33 and the reset elastic element 4 provides a stable and reliable connection, ensuring that the reset elastic element 4 will not loosen or fall off when transmitting elastic force, thereby ensuring the stability and reliability of the automatic reset function of the seal 3.

[0034] More specifically, such as Figure 1 and Figure 2 As shown, the housing 1 includes a first housing 11 and a second housing 12, which are detachably connected. A seal 3 is installed between the first housing 11 and the second housing 12, and a pen inlet 121 is located on the second housing 12. The detachable connection design allows the first housing 11 and the second housing 12 to be easily separated, which greatly facilitates installation and maintenance. The seal 3 is installed between the two housings to ensure that the seal 3 remains stable during operation. The pen inlet 121 is located on the second housing 12. This design makes the position of the pencil insertion clear and matches the installation position of the seal 3, ensuring that the seal 3 can be smoothly pushed open when the pencil is inserted.

[0035] 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 pencil sharpener, comprising a housing (1) and a core assembly (2) installed within the housing (1), wherein the housing (1) is provided with a pen inlet (121) for a pen to pass through into the core assembly (2), characterized in that, The pen inlet (121) is located at the rotation center of the housing (1). At least two seals (3) are movably installed inside the housing (1). The at least two seals (3) are distributed in a rotationally symmetrical manner around the pen inlet (121). The at least two seals (3) can be relatively far apart to open the pen inlet (121) or relatively close together to close the pen inlet (121) when subjected to force.

2. A pencil sharpener according to claim 1, characterized in that, The sealing element (3) is connected to a reset elastic element (4). At least two of the sealing elements (3) are relatively far apart under the force of the pen inlet to open the pen inlet (121), and at least two of the sealing elements (3) are relatively close to each other under the force of the reset elastic element (4) to close the pen inlet (121).

3. A pencil sharpener according to claim 1 or 2, characterized in that, The housing (1) is equipped with a bracket (5) that is compatible with the seal (3). The bracket (5) is provided with a rotating shaft (51). The seal (3) is connected to the rotating shaft (51) and is rotatably mounted on the bracket (5).

4. A pencil sharpener according to claim 3, characterized in that, The sealing element (3) is provided with a conical recess (31) adapted to the pen inlet (121), and the conical recess (31) is used to guide the pen tip insertion.

5. A pencil sharpener according to claim 4, characterized in that, The sealing element (3) is provided with a clearance recess (32) that engages with the conical recess (31). The clearance recess (32) is located on the side close to the rotating shaft (51), and the conical recess (31) is located on the side away from the rotating shaft (51).

6. A pencil sharpener according to claim 3, characterized in that, The bracket (5) is provided with a limiting structure (52), which is used to abut against the seal (3) to limit the rotation range of the seal (3).

7. A pencil sharpener according to claim 3, characterized in that, The bracket (5) is provided with an arc-shaped guide section (53) adapted to the seal (3), and the arc-shaped guide section (53) is used to guide the rotation of the seal (3).

8. A pencil sharpener according to claim 3, characterized in that, The bracket (5) is provided with an installation groove (54), which is used to install the reset elastic element (4). One end of the reset elastic element (4) abuts against the inner wall of the installation groove (54), and the other end of the reset elastic element (4) is connected to the seal (3).

9. A pencil sharpener according to claim 8, characterized in that, The mounting groove (54) has an arc-shaped structure, and the side wall of the sealing element (3) is provided with a connecting post (33), which is sleeved with the other end of the reset elastic element (4).

10. A pencil sharpener according to claim 1, characterized in that, The housing (1) includes a first housing (11) and a second housing (12), the first housing (11) and the second housing (12) are detachably connected, the seal (3) is installed between the first housing (11) and the second housing (12), and the pen inlet (121) is provided on the second housing (12).

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