Pencil feeding box and electric pencil sharpener

Abstract

The utility model discloses a pencil feeding box and an electric pencil sharpener, and belongs to the technical field of electric pencil sharpeners, the pencil feeding box comprises a first pencil clamping assembly, a second pencil clamping assembly, a locking assembly and a pre-tightening assembly, and the first pencil clamping assembly and the second pencil clamping assembly are connected with the pre-tightening assembly; the pre-tightening assembly provides force for the first pen clamping assembly and the second pen clamping assembly to get close to each other for clamping, cams are arranged on the first pen clamping assembly and / or the second pen clamping assembly, and the locking assembly is in transmission connection with the cams on the first pen clamping assembly and / or the second pen clamping assembly. The cam rotates to drive the first pencil clamping assembly and the second pencil clamping assembly to expand and contract in a reciprocating mode, and pencils penetrating through the first pencil clamping assembly and the second pencil clamping assembly drive the locking assembly to be separated from the cam. The first pencil clamping assembly and the second pencil clamping assembly are arranged to expand and contract in a reciprocating mode, so that pencil feeding is labor-saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric pencil sharpener, in particular to a pencil feeding box and an electric pencil sharpener. BACKGROUND

[0002] As a pencil sharpening tool, the pencil sharpener is very popular among students. The pencil sharpener includes a pencil feeding mechanism and a pencil sharpening mechanism. When sharpening the pencil, the pencil is inserted into the pencil sharpening mechanism through the pencil feeding mechanism. After the pencil is in place, the pencil feeding mechanism clamps the pencil, and then the pencil sharpening mechanism cuts the pencil tip. After the pencil is sharpened, the pencil feeding mechanism can also eject the pencil from the pencil sharpener.

[0003] At present, there are various structures of pencil feeding mechanisms that can automatically feed and eject pencils. However, the clamping force of most pencil feeding mechanisms comes from elastic members, which have clamping force due to elastic deformation. The user needs to insert the pencil into the pencil feeding mechanism between the first pencil feeding assembly and the second pencil feeding assembly. That is, the user needs to exert force to open the first pencil feeding assembly and the second pencil feeding assembly, so that the pencil can be smoothly inserted and subjected to the corresponding clamping force. Related prior art such as Chinese patent application "Pencil sharpener pencil clamping mechanism", application number: CN202020497207.5, includes a fixed seat, a plurality of limiting claws distributed along the circumference, and a fixed cover. The fixed seat is provided with a chuck and an elastic member. The elastic member is located between the chuck and the fixed cover. The center of the chuck is provided with a through hole for the pencil to pass through. One end of the elastic member is connected to the chuck, and the other end is connected to the fixed seat. In the pencil insertion state, the inner end of all limiting claws drives the chuck to rotate around the axis of the center hole. In the pencil non-insertion state, the chuck is reset by the elastic member and drives the chuck to rotate and reset. The chuck and all limiting claws are disengaged. The pencil clamping mechanism has compact structure, small space occupation, simple part processing, low cost, small number of parts, and good synchronicity.

[0004] However, when the pencil diameter is large, the user needs to overcome the resistance of the elastic element, making it difficult for the user to advance or retract the pencil, and the user experience is not good. Related prior art such as Chinese Patent Application "Pencil Sharpening Mechanism and Pencil Sharpening Device with the Same", Application No. CN202211066871.4, discloses a pencil sharpening mechanism comprising: a cover; a first pencil clamping assembly; a second pencil clamping assembly movable relative to the first pencil clamping assembly between a release position and a clamping position; one or more first elastic elements having an elastic tendency to position the first pencil clamping assembly and the second pencil clamping assembly in the release position; a connecting member, and an inner wall having an inner annular guide surface, and the connecting member is movable between a first position and a second position, and the first pencil clamping assembly and the second pencil clamping assembly are in abutment with the inner annular guide surface through the elastic force of the first elastic element. The above-mentioned patent application provides a pencil sharpening mechanism, which sets the first elastic element to make the first pencil clamping assembly and the second pencil clamping assembly in the initial position in the release state, so that the pencil is easier to advance, and the connecting member is added to drive the first pencil clamping assembly and the second pencil clamping assembly to move to the clamping position, preventing the pencil from rotating with the pencil holder during sharpening.

[0005] The above-mentioned Chinese patent application can solve the problem of excessive resistance of the user inserting the pencil. However, the connecting member needs to switch the position, thereby switching the first pencil clamping assembly and the second pencil clamping assembly to be in the release position or in the clamping position. The present application designs a new pencil insertion and clamping mechanism, which has a simpler overall structure and can be well applied in existing pencil sharpeners. Utility model content

[0006] The technical problem to be solved by the present application is to provide a pencil insertion box and an electric pencil sharpener, which sets the first pencil clamping assembly and the second pencil clamping assembly to have a reciprocating expansion and contraction action, making it easier to advance the pencil.

[0007] The technical scheme adopted by the present application is: a pencil insertion box, comprising a first pencil clamping assembly, a second pencil clamping assembly, a locking assembly and a pre-tightening assembly, the first pencil clamping assembly and the second pencil clamping assembly are connected with the pre-tightening assembly respectively, the pre-tightening assembly provides a force for the first pencil clamping assembly and the second pencil clamping assembly to approach each other and clamp, a cam is provided on the first pencil clamping assembly and / or the second pencil clamping assembly, the locking assembly is in transmission connection with the cam on the first pencil clamping assembly and / or the second pencil clamping assembly respectively, the rotation of the cam drives the first pencil clamping assembly and the second pencil clamping assembly to reciprocally expand and contract, and the pencil passing through the first pencil clamping assembly and the second pencil clamping assembly drives the locking assembly to disengage from the cam.

[0008] Compared with the prior art, the application has the advantages that through the cooperation of the cam and the locking assembly, the first pencil clamping assembly and the second pencil clamping assembly reciprocate expansion and contraction when the pencil is inserted. Then, after the pencil stops at the blocked position, the pencil can be inserted with small resistance after the pencil clamping assembly expands, which solves the problem of excessive insertion resistance of the pencil for the user and improves the user experience. The overall structure of the application is simple, can be well applied in the existing pencil sharpener, and the connection and cooperation between various components are relatively close, effectively utilizing the space and ensuring the compactness of the pencil sharpener. In addition, the pre-tightening assembly provides clamping force to ensure the stable clamping of the pencil during the pencil sharpening process; the transmission connection of the locking assembly and the cam ensures the accuracy and reliability of the action of the pencil clamping assembly, so that the advance and retreat of the pencil is more smooth and stable.

[0009] In some embodiments of the application, the application includes a vortex disc, the first pencil clamping assembly includes a first rubber roller coaxially provided with a cam, the second pencil clamping assembly includes a second rubber roller coaxially provided with a cam, the first rubber roller and the second rubber roller are connected with the vortex disc, and the rotation of the vortex disc drives the rotation of the first rubber roller and the second rubber roller, and the rotation of the first rubber roller and the second rubber roller drives the synchronous rotation of the coaxial cams.

[0010] Through the coaxial connection of the vortex disc, the rubber roller and the cam, the centralized transmission of power is realized, the structure is compact and the transmission efficiency is high. The rotation of the vortex disc can synchronously drive the rotation of the two rubber rollers and their cams, ensuring the synchronization and consistency of the actions of the first pencil clamping assembly and the second pencil clamping assembly, and improving the stability of the pencil advance and retreat process.

[0011] In some embodiments of the application, the application includes a mounting seat, the locking assembly includes two opposite arranged supporting rods, the supporting rods are provided with protrusions, the protrusions are in contact with the outer circumferential surface of the cam, the supporting rods are connected with the mounting seat through springs, and the springs apply the protrusions to keep in contact with the cam.

[0012] The locking assembly adopts the structure of the supporting rod and the spring, which is simple and reliable. The action of the spring enables the protrusion to always keep in contact with the outer circumferential surface of the cam, ensuring the sensitivity of the locking and releasing actions. The mounting seat provides a stable mounting basis for the supporting rod, ensuring the positional accuracy and stability of the entire locking assembly during the working process.

[0013] In some embodiments of the application, the supporting rods, the first rubber roller and the second rubber roller are arranged in parallel, one side of the protrusion is in contact with the first rubber roller and the second rubber roller, the first rubber roller and the second rubber roller limit the limit position of the inward movement of the protrusion, and the supporting rod can move outward under stress to make the protrusion separate from the cam.

[0014] The parallel arrangement of the supporting rods and the rubber rollers makes the layout of the whole mechanism more reasonable and the action transmission more direct. The contact between the protrusions and the rubber rollers limits the limit position of the inward movement of the rubber rollers, avoiding the excessive entry of the protrusions into the rubber rollers, which affects the normal insertion of the pencil. At the same time, the design of the outward movement of the supporting rods under stress enables timely release of the lock during pencil insertion, smooth action, and improved convenience of pencil insertion.

[0015] In some embodiments of the present application, there is a gap between the two oppositely arranged supporting rods, and the pencil passing through the first pencil clamping assembly and the second pencil clamping assembly passes through the gap between the two supporting rods and pushes the two supporting rods to move outward and away from each other.

[0016] The gap between the two supporting rods provides a channel for the insertion of the pencil, and the pencil can directly push the supporting rods to move outward. This design makes the insertion action of the pencil more natural and smooth. The outward movement of the supporting rods combined with the insertion action of the pencil eliminates the need for additional complex operations, simplifying the user's usage process.

[0017] In some embodiments of the present application, the inner side of the supporting rod near the pencil is curved. The curved design can better fit the outer surface of the pencil, reducing friction and resistance between the pencil and the supporting rod during insertion. At the same time, the transition of the curved surface makes the pencil more stable when pushing the supporting rod to move, avoiding the phenomenon of jamming or instability caused by shape mutation, and improving the user experience.

[0018] In some embodiments of the present application, two slides are symmetrically arranged on the mounting seat, and the two supporting rods are installed on the two slides respectively. The supporting rods move linearly along the slides. The slide includes a bottom plate and a back plate. The bottom plate limits the height of the supporting rod, and the supporting rod is located between the cam and the back plate.

[0019] The symmetrical arrangement of the slides provides a stable linear motion track for the supporting rods, ensuring the precision and stability of the supporting rods during movement. The limitation of the height of the supporting rod by the bottom plate ensures that the supporting rod does not deviate or tilt during movement, ensuring the compactness and reliability of the whole mechanism. The relative position relationship between the back plate and the cam is also reasonably arranged, further optimizing the space layout.

[0020] In some embodiments of the present application, the first pencil clamping assembly includes a first mounting bracket, and the two ends of the first rubber roller are installed on the first mounting bracket. The second pencil clamping assembly includes a second mounting bracket, and the two ends of the second rubber roller are installed on the second mounting bracket.

[0021] The mounting bracket provides a stable mounting basis for the rubber roller, ensuring the stability and precision of the rubber roller during rotation. The installation method at both ends can effectively prevent the rubber roller from swinging or deviating under stress, improving the overall rigidity and reliability of the pencil clamping assembly and ensuring the stability of the pencil during clamping and sharpening.

[0022] In some embodiments of the present application, the first mounting frame and the second mounting frame are each provided with an inner-rotating groove, the pre-tightening assembly comprises a rotating disc and an elastic member, the rotating disc is provided with two supporting legs at the bottom, the two supporting legs respectively extend into the grooves of the top surfaces of the first mounting frame and the second mounting frame, and the elastic member drives the rotating disc to rotate in one direction, thereby driving the first mounting frame and the second mounting frame to move close to each other.

[0023] The elastic member is a clamping spring with an arc structure, one end of the clamping spring is mounted on a mounting seat, and the other end of the clamping spring is connected to the rotating disc. The elastic member drives the rotating disc to rotate, so that the supporting legs push the mounting frames to move close to each other in the grooves, thereby realizing automatic application of the pre-tightening force. This design not only has a simple structure, but also can adjust the size of the pre-tightening force according to needs, thereby ensuring that the clamping force of the pencil clamping assembly on the pencil is moderate, that is, the pencil is not difficult to insert due to excessive force, and the pencil is not loose during pencil sharpening due to insufficient force.

[0024] An electric pencil sharpener comprises the pencil feeding box.

[0025] On the basis of common knowledge in the art, the above-mentioned embodiments can be combined arbitrarily. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described in detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the present application. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described objects and can contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0027] Figure 1 is a structural schematic diagram of the present application;

[0028] Figure 2 is a top view of the present application;

[0029] Figure 3 is Figure 2 a sectional view along AA section;

[0030] Figure 4 is Figure 2 a sectional view along BB section;

[0031] Figure 5 is an exploded structural schematic diagram of the present application; Figure 1 ;

[0032] Figure 6 is an exploded structural schematic diagram of the present application; Figure 2 .

[0033] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Cam; 2. Scroll plate; 3. First rubber roller; 4. Second rubber roller; 5. Mounting base; 6. Support rod; 7. Protrusion; 8. Spring; 9. Slide; 10. Base plate; 11. Back plate; 12. First mounting bracket; 13. Second mounting bracket; 14. Turntable; 15. Elastic element; 16. Support leg; 17. Groove. Detailed Implementation

[0034] The present application will now be described in detail with reference to the accompanying drawings.

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] A pen feeder, as described in Embodiment 1 Figures 1 to 4 The device includes a first pen-clamping assembly, a second pen-clamping assembly, a locking assembly, and a pre-tightening assembly. The first and second pen-clamping assemblies are connected to the pre-tightening assembly, which provides a force to clamp the first and second pen-clamping assemblies together. A cam 1 is provided on the first and / or second pen-clamping assemblies. The locking assembly is kinetically connected to the cam 1 on the first and / or second pen-clamping assemblies. The rotation of the cam 1 causes the first and second pen-clamping assemblies to reciprocate, expanding and contracting. A pencil passing through the first and second pen-clamping assemblies drives the locking assembly to disengage from the cam 1. Through the cooperation of the cam 1 and the locking assembly, the first and second pen-clamping assemblies reciprocate, expanding and contracting when a pencil is inserted. After the pencil stops at an obstructed position, it can be inserted with minimal resistance once the pen-clamping assemblies expand, solving the problem of excessive resistance when inserting a pencil and improving the user experience.

[0037] The overall structure of this application is simple and can be well applied to existing pencil sharpeners. The connections and cooperation between the various components are relatively tight, making effective use of space and ensuring the compactness of the pencil sharpener. In addition, the pre-tightening component provides clamping force to ensure stable holding of the pencil during the sharpening process; the locking component is connected to the transmission of cam 1 to ensure the accuracy and reliability of the pencil clamping component's movement, making the pencil's forward and backward movement smoother and more stable.

[0038] The top surfaces of the first mounting bracket 12 and the second mounting bracket 13 are both provided with inwardly rotating grooves 17. The pre-tightening assembly includes a turntable 14 and an elastic element 15. The bottom of the turntable 14 is provided with two support legs 16, which extend into the grooves 17 on the top surfaces of the first mounting bracket 12 and the second mounting bracket 13, respectively. The elastic element 15 drives the turntable 14 to rotate in one direction, causing the first mounting bracket 12 and the second mounting bracket 13 to move closer to each other.

[0039] The elastic element 15 is an arc-shaped retaining spring, with one end mounted on the mounting base 5 and the other end connected to the turntable 14. The elastic element 15 drives the turntable 14 to rotate, causing the support legs 16 to push the mounting brackets closer together within the groove 17, thus automatically applying the preload. This design is not only simple in structure but also allows for adjustment of the preload as needed, ensuring that the pencil clamping assembly holds the pencil with appropriate force. It prevents the pencil from being too difficult to insert due to excessive force, or from becoming too loose during sharpening due to insufficient force.

[0040] Example 2, as Figures 1 to 6 As shown, this application includes a scroll plate 2. The first pen clamping assembly includes a first rubber roller 3, with a cam 1 coaxially mounted on the first rubber roller 3. The second pen clamping assembly includes a second rubber roller 4, with a cam 1 coaxially mounted on the second rubber roller 4. The first rubber roller 3 and the second rubber roller 4 are connected to the scroll plate 2. The rotation of the scroll plate 2 drives the first rubber roller 3 and the second rubber roller 4 to rotate, which in turn drives the coaxial cam 1 to rotate synchronously. Through the coaxial connection of the scroll plate 2 with the rubber rollers and the cam 1, concentrated power transmission is achieved, resulting in a compact structure and high transmission efficiency. The rotation of the scroll plate 2 can synchronously drive the rotation of the two rubber rollers and their cam 1, ensuring the synchronicity and consistency of the actions of the first and second pen clamping assemblies, and improving the stability of the pencil advance and retraction process.

[0041] This application includes a mounting base 5. The locking assembly includes two opposing support rods 6, each with a protrusion 7 that contacts the outer peripheral surface of the cam 1. The support rods 6 are connected to the mounting base 5 via springs 8, which apply pressure to the protrusions 7 to maintain contact with the cam 1. The locking assembly, with its support rods 6 and springs 8, is simple and reliable. The springs 8 ensure that the protrusions 7 always maintain contact with the outer peripheral surface of the cam 1, guaranteeing the sensitivity of locking and releasing actions. The mounting base 5 provides a stable mounting foundation for the support rods 6, ensuring the positional accuracy and stability of the entire locking assembly during operation.

[0042] The support rod 6, the first rubber roller 3, and the second rubber roller 4 are arranged in parallel. One side of the protrusion 7 contacts the first rubber roller 3 and the second rubber roller 4. The first rubber roller 3 and the second rubber roller 4 limit the protrusion 7's inward movement to its extreme position. The support rod 6 can move outward under force, causing the protrusion 7 to disengage from the cam 1. The parallel arrangement of the support rod 6 and the rubber rollers makes the layout of the entire mechanism more reasonable and the action transmission more direct. The contact between the protrusion 7 and the rubber rollers limits its inward movement to its extreme position, preventing the protrusion 7 from excessively entering between the rubber rollers and affecting the normal insertion of the pencil. At the same time, the design of the support rod 6 being able to move outward under force allows for timely release and locking when the pencil is inserted, resulting in smooth operation and improving the convenience of pencil insertion.

[0043] The two support rods 6 are arranged in a relative position with a space between them. When a pencil passes through the first pencil clamping assembly and the second pencil clamping assembly, the pencil pushes the two support rods 6 to move outward and away from each other. The space between the two support rods 6 provides a channel for the insertion of the pencil, and the pencil can directly push the support rods 6 to move outward. This design makes the insertion of the pencil more natural and smooth. The outward movement of the support rods 6 is combined with the insertion of the pencil, without the need for additional complex operations, simplifying the user's usage process.

[0044] The inner side of the support rod 6 near the pencil is curved. The curved design can better fit the outer surface of the pencil, reducing friction and resistance between the pencil and the support rod 6 during insertion. At the same time, the transition of the curved surface makes the pencil more stable when pushing the support rod 6 to move, avoiding the phenomenon of jamming or instability caused by shape mutation, improving the user experience.

[0045] The mounting seat 5 is symmetrically provided with two carriages 9, and the two support rods 6 are respectively installed on the two carriages 9. The support rods 6 move linearly along the carriages 9. The carriage 9 includes a bottom plate 10 and a back plate 11. The bottom plate 10 limits the height of the support rod 6, and the support rod 6 is located between the cam 1 and the back plate 11. The symmetrical arrangement of the carriage 9 provides a stable linear motion track for the support rod 6, ensuring the accuracy and stability of the support rod 6 during movement. The limitation of the height of the support rod 6 by the bottom plate 10 ensures that the support rod 6 does not deviate or tilt during movement, ensuring the compactness and reliability of the entire mechanism. The relative position relationship between the back plate 11 and the cam 1 is also reasonably arranged, further optimizing the space layout.

[0046] The first pencil clamping assembly includes a first mounting frame 12, and the two ends of the first rubber roller 3 are installed on the first mounting frame 12. The second pencil clamping assembly includes a second mounting frame 13, and the two ends of the second rubber roller 4 are installed on the second mounting frame 13. The mounting frame provides a stable installation basis for the rubber roller, ensuring the stability and accuracy of the rubber roller during rotation. The installation method at both ends can effectively prevent the rubber roller from swinging or deviating under stress, improving the overall rigidity and reliability of the pencil clamping assembly and ensuring the stability of the pencil during clamping and sharpening.

[0047] The other contents of embodiment two are the same as those of embodiment one.

[0048] An electric pencil sharpener, embodiment three, includes a pencil entry box as described in embodiment one or embodiment two.

[0049] The application is described in detail above, and the principles and implementation manners of the application are described by applying specific examples. The above description of the examples is only used to help understand the application and the core idea. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A pen advance box characterized by comprising: The first pencil clamping assembly, the second pencil clamping assembly, the locking assembly and the pre-tightening assembly are connected, the pre-tightening assembly provides the force for the first pencil clamping assembly and the second pencil clamping assembly to clamp each other, the cam (1) is arranged on the first pencil clamping assembly and / or the second pencil clamping assembly, the locking assembly is in transmission connection with the cam (1) on the first pencil clamping assembly and / or the second pencil clamping assembly, the cam (1) rotates to drive the first pencil clamping assembly and the second pencil clamping assembly to expand and contract reciprocally, and the pencil passing through the first pencil clamping assembly and the second pencil clamping assembly drives the locking assembly to be separated from the cam (1).

2. A lead box according to claim 1, wherein The first pencil clamping assembly comprises the first rubber roller (3), the first rubber roller (3) is coaxially provided with the cam (1), the second pencil clamping assembly comprises the second rubber roller (4), the second rubber roller (4) is coaxially provided with the cam (1), the first rubber roller (3) and the second rubber roller (4) are connected with the vortex disc (2), the vortex disc (2) rotates to drive the first rubber roller (3) and the second rubber roller (4) to rotate, and the first rubber roller (3) and the second rubber roller (4) rotate to drive the coaxial cam (1) to rotate synchronously.

3. A pencil lead box according to claim 1, wherein The locking assembly comprises two opposite arranged supporting rods (6), the supporting rod (6) is provided with the protrusion (7), the protrusion (7) is in contact connection with the outer circumferential surface of the cam (1), the supporting rod (6) is connected with the mounting seat (5) through the spring (8), and the spring (8) applies the contact between the protrusion (7) and the cam (1).

4. A lead box according to claim 3, wherein The supporting rod (6), the first rubber roller (3) and the second rubber roller (4) are arranged in parallel, one side of the protrusion (7) is in contact with the first rubber roller (3) and the second rubber roller (4), the first rubber roller (3) and the second rubber roller (4) limit the limit position of the inward movement of the protrusion (7), and the supporting rod (6) can move outward under the force to make the protrusion (7) separate from the cam (1).

5. A pencil lead box according to claim 3, wherein There is a space between the two opposite arranged supporting rods (6), the pencil passing through the first pencil clamping assembly and the second pencil clamping assembly passes between the two supporting rods (6) and pushes the two supporting rods (6) to move outward and away from each other.

6. A pencil lead box according to claim 3, wherein The inner side surface of the supporting rod (6) close to the pencil is a curved surface.

7. A pencil lead box according to claim 3, wherein Two carriages (9) are symmetrically arranged on the mounting seat (5), the two supporting rods (6) are respectively installed on the two carriages (9), the supporting rod (6) moves linearly along the carriage (9), the carriage (9) comprises a bottom plate (10) and a back plate (11), the height of the supporting rod (6) is limited by the bottom plate (10), and the supporting rod (6) is located between the cam (1) and the back plate (11).

8. The pencil lead box of claim 1, wherein, The first pencil clamping assembly comprises a first mounting frame (12), and two ends of the first rubber roller (3) are mounted on the first mounting frame (12), the second pencil clamping assembly comprises a second mounting frame (13), and two ends of the second rubber roller (4) are mounted on the second mounting frame (13).

9. A pencil lead box according to claim 8, wherein The first mounting frame (12) and the second mounting frame (13) are provided with inner rotating grooves (17) on top surfaces, the pre-tightening assembly comprises a rotating disc (14) and an elastic member (15), the rotating disc (14) is provided with two supporting legs (16) on a bottom, the two supporting legs (16) respectively extend into the grooves (17) on the top surfaces of the first mounting frame (12) and the second mounting frame (13), and the elastic member (15) drives the rotating disc (14) to rotate in one direction, and drives the first mounting frame (12) and the second mounting frame (13) to approach each other.

10. An electric pencil sharpener characterized by comprising: A pen advancement box comprising a pen advancement box according to any one of claims 1-9.

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