Pencil sharpener

Abstract

The utility model relates to a pencil sharpener which comprises a support provided with a through hole allowing a pencil to penetrate. The clamping mechanism comprises two sets of clamping assemblies which are arranged in the left-right direction and arranged in parallel, and the two clamping assemblies are symmetrically and rotationally arranged on the support relative to the center of the through hole; the swing arms are arranged corresponding to the clamping assemblies respectively, the first ends of the swing arms are rotationally connected to the support, the second ends of the swing arms and the second ends of the clamping assemblies are arranged in a restrained mode to drive the clamping assemblies to swing in the left-right direction, and the second ends of the swing arms are connected to the support through first elastic pieces; the first elastic piece has the trend of pulling the second end of the swing arm to approach the other clamping assembly. According to the pencil sharpener, the acting force generated when a user inserts a pencil can be reduced, and meanwhile the clamping torque of the clamping assembly on the pencil can be guaranteed.

Description

Technical Field

[0001] The utility model relates to a pencil sharpener. Background Art

[0002] A pencil sharpener generally includes a machine body, a pen feeding mechanism, a pencil sharpening mechanism, and a pencil shavings box, among which the pen feeding mechanism is the key structure of the pencil sharpener. The pen feeding mechanism in the existing pencil sharpener can only adapt to the clamping of pens of one size. The thickness and size of the pencil shaft have various specifications, and the existing pen feeding mechanism cannot adapt to pencils of various thicknesses and sizes well, and has poor applicability. In order to solve this problem, the Chinese utility model patent "A Pen-Clamping Mechanism, Pen-Feeding Mechanism, and Pencil Sharpener" with authorization announcement number CN219076896U (application number 202223437822.5) discloses a pen-clamping mechanism, including a bracket with a through hole, two sets of rotating components arranged on the bracket in parallel and at intervals, the rotating components including a base frame, a rotating shaft, a roller and an elastic member, the base frame is rotatably connected to the bracket, the rotating shaft can be rotatably connected to the inner side of the base frame on its own axis, the roller is sleeved on the rotating shaft, the elastic member is connected to the bracket and abuts against the outer side of the base frame, and the elastic members in the two sets of rotating components have a tendency to press the two base frames in a relatively close direction. Based on the determination of the torque required by the rotating component, when inserting a pencil between the two rotating components due to the short rotation force arm, the user needs to apply a very large force, and the operation is relatively laborious. In addition, when inserting a pencil, the pencil needs to push the two sets of rotating components outward as a whole, which causes the gears arranged on the rotating shaft to be greatly displaced relative to the rotating disk, thereby making the meshing rotation stability between the two poor. Utility Model Content

[0003] The first technical problem to be solved by the utility model is to provide a pencil sharpener which can reduce the force applied when a user inserts a pen and can ensure the clamping torque of the clamping assembly on the pencil in view of the above-mentioned prior art.

[0004] The second technical problem to be solved by the utility model is to provide a pencil sharpener which can reduce the displacement of the gear relative to the turntable when the pen is inserted and improve the meshing stability between the gear and the turntable based on the above-mentioned prior art to realize the pen feeding and retracting functions.

[0005] The utility model solves the above-mentioned first technical problem by adopting the following technical solution: a pencil sharpener, comprising

[0006] A bracket having a through hole for the pen to pass through;

[0007] The clamping mechanism comprises two groups of clamping assemblies arranged in left-right direction and parallel to each other, and the two clamping assemblies are rotatably arranged on the bracket relative to the center of the through hole in a symmetrical manner;

[0008] It is characterized by: it also includes

[0009] Swing arm, one is provided corresponding to each clamping assembly. The first end of the swing arm is rotatably connected to the bracket, and the second end of the swing arm is constrained with the second end of the clamping assembly to drive the clamping assembly to swing in the left-right direction. And the second end of the swing arm is connected to the bracket through a first elastic member, and the first elastic member has a tendency to pull the second end of the swing arm closer to the other clamping assembly.

[0010] Preferably, the clamping assembly includes a rotating shaft and a clamping sleeve sleeved on the rotating shaft;

[0011] The first end of the rotating shaft is rotatably positioned on the bracket, and the second end of the rotating shaft is constrained with the second end of the swing arm.

[0012] Preferably, the bracket is provided with a first limiting hole matching the left-right displacement range of the second end of the rotating shaft, and the second end of the rotating shaft is inserted into the first limiting hole;

[0013] The second end of the swing arm is provided with a second limiting hole matching the displacement range of the second end of the rotating shaft relative to the swing arm, and the second end of the rotating shaft is inserted into the second limiting hole.

[0014] The technical solution adopted by the present utility model to solve the above second technical problem is: a turntable is rotatably arranged on the bracket corresponding to the central axis of the through hole, and a jack matching the through hole is opened on the turntable;

[0015] A gear is sleeved on the first end of the rotating shaft in each group of clamping assemblies, and the gear meshes with the turntable.

[0016] In order to facilitate the rotational installation of the gear on the bracket, a limiting plate extends downward along the edge of the jack on the turntable, and the limiting plate is embedded in the through hole;

[0017] A plurality of racks inclined relative to the radial direction are arranged on the turntable along the circumferential direction, or a plurality of racks spirally bent are arranged on the turntable along the circumferential direction.

[0018] Beautifully and safely, the bracket is a box body with an accommodation cavity, and the through hole penetrates through the top plate and the bottom plate of the box body;

[0019] The clamping mechanism is arranged in the accommodation cavity, and the two groups of clamping assemblies of the clamping mechanism are rotatably supported on the front panel and the rear panel of the box body, and the swing arms corresponding to the two groups of clamping assemblies are respectively rotatably arranged on the front side wall and the rear side wall of the box body.

[0020] In order to further ensure the clamping force on the pen, a first clamping plate and a second clamping plate that can be opened and closed relatively are horizontally slidably arranged in the box body, and second elastic members are arranged between the first clamping plate and the box body and between the second clamping plate and the box body, and the second elastic members have a tendency to elastically press the first clamping plate and the second clamping plate to close relatively;

[0021] On the opposite sides of the first clamping plate and the second clamping plate, there are respectively notches that can form pores when they are aligned.

[0022] In order to ensure the stability of the horizontal movement of the first clamping plate and the second clamping plate, a reset component is provided on the outside of the box body corresponding to the first clamping plate and the second clamping plate, and the outer ends of the first clamping plate and the second clamping plate are respectively constrained by inclined surface cooperation with the upper ends of the corresponding reset components;

[0023] The reset component is arranged in the box body so as to be movable up and down through a third elastic member, and the third elastic member has a tendency to elastically press the reset component to move upward.

[0024] Preferably, the reset component includes a fixed seat arranged in the box body, and a reset block arranged to be movably constrained on the fixed seat in the up and down direction, and the third elastic member is arranged between the reset block and the fixed seat;

[0025] The outer ends of the first clamping plate and the second clamping plate are respectively constrained by inclined surface cooperation with the upper ends of the reset blocks in the corresponding reset components.

[0026] Preferably, a limiting groove with an upward opening is provided in the box body, and the reset component is arranged in the limiting groove.

[0027] Compared with the prior art, the advantages of the present utility model are as follows: In the pencil sharpener of the present utility model, the opening and closing constraints of the two sets of clamping components in the clamping mechanism are realized by setting the swing arm in cooperation with the first elastic member. When the torque required by the clamping component is determined, based on the swing arm, the force arm length of the clamping component is increased, and correspondingly, less force is required when inserting the pen between the two clamping components, and the user's pen insertion operation is more labor-saving, but the clamping torque of the clamping mechanism on the pen remains stable.

[0028] On this basis, the swing arm is constrained and linked with the end of the rotating shaft far from the gear. In this way, when the swing arm drives the rotating shaft to swing open and close, the displacement of the gear is very small, and correspondingly, the influence on the meshing stability between the gear and the turntable is also very small, which can ensure the meshing stability between the gear and the turntable and avoid the occurrence of relative jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional internal structure diagram of the pencil sharpener in the embodiment of the present utility model.

[0030] Figure 2 is Figure 1 exploded view of

[0031] Figure 3 is Figure 1 cross-sectional view of

[0032] Figure 4 is Figure 1 a sectional view of another section.

[0033] Figure 5 is Figure 1 a sectional view of yet another section.

[0034] Figure 6 a perspective view of another turntable in the embodiment of the present utility model. Specific embodiments

[0035] The present utility model will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0036] As Figures 1 to 5 shown, the pencil sharpener in this embodiment includes a bracket 1, a clamping mechanism 2, and a swing arm 3. These components form a pen clamping structure in the pencil sharpener for clamping the pen inserted therein. The pencil sharpener further includes a turntable 4 and a gear 23, and the cooperation between the two can realize the pen feeding and pen retracting operations.

[0037] The bracket 1 therein has a through hole 11 for the pen to pass through, and the diameter of the through hole 11 is greater than the maximum diameter of the existing pen. For the structural aesthetics and structural use safety, the bracket 1 in this embodiment is a box body with a receiving cavity. The through hole 11 penetrates through the top plate and the bottom plate of the box body, that is, through holes 11 are provided on both the top plate and the bottom plate of the box body for the pen to penetrate and insert. The clamping mechanism 2, the turntable 4, and the gear 23 are all arranged in the receiving cavity of the box body. For the convenience of assembly, the box body can be formed by fitting together an upper box body and a lower box body. In this embodiment, the clamping mechanism 2, the turntable 4, and the gear 23 are all arranged in the lower box body.

[0038] The clamping mechanism 2 includes two groups of clamping components 20 arranged in the left - right direction and parallel to each other. The two clamping components 20 are rotatably arranged on the bracket 1 symmetrically with respect to the center of the through hole 11. The clamping component 20 includes a rotating shaft 21 and a clamping sleeve 22 sleeved on the rotating shaft 21. The clamping sleeve 22 in this embodiment includes a shaft sleeve sleeved on the rotating shaft 21 and a leather sleeve sleeved on the shaft sleeve. The shaft sleeve can realize the smooth rotation of the clamping sleeve 22 relative to the rotating shaft, and the leather sleeve can ensure a good clamping force on the pen. When the two clamping sleeves 22 are attached together, a gap is formed between the middles of the two clamping sleeves 22, which is opposite to the position of the through hole 11 and through which the pen tip can enter. The width of this gap is less than the minimum diameter of the existing pen. Then, after the pen is inserted between the two groups of clamping components 20, the pen pushes the two groups of clamping components 20 outward and apart to the left and right.

[0039] The first end of the rotating shaft 21 is rotatably positioned on the bracket 1, that is, the position of the first end of the rotating shaft 21 remains basically stationary.

[0040] One swing arm 3 is provided corresponding to each clamping component 20. The first end of the swing arm 3 is rotatably connected to the bracket 1, and the second end of the swing arm 3 is constrained to the second end of the clamping component 20 to drive the clamping component 20 to swing in the left - right direction. Specifically, the second end of the swing arm 3 is constrained to the second end of the rotating shaft 21. Thus, when the rotating shaft 21 and the driving force of the pen move left and right, the swing arm 3 will correspondingly swing left and right with its first end as the rotation center. And the second end of the swing arm 3 is connected to the bracket 1 through a first elastic member 30. The first elastic member 30 has a tendency to pull the second end of the swing arm 3 closer to the other clamping component 20, that is, based on this first elastic member 30, the relative approaching tendency of the two groups of clamping components 20 is satisfied to realize the clamping force of the clamping mechanism 2 on the pen.

[0041] In this embodiment, the two groups of clamping components 20 of the clamping mechanism 2 are rotatably supported on the front panel and the rear panel of the box body serving as the bracket 1. Due to the centrosymmetric arrangement of the two groups of clamping components 20, the swing arms 3 corresponding to the two groups of clamping components 20 are respectively rotatably arranged on the front side wall and the rear side wall of the box body. Specifically, the first end of the swing arm 3 is rotatably arranged on the side wall of the box body serving as the bracket 1. A first limiting hole 12 is arranged on the side wall of the box body serving as the bracket 1 to match the left - right displacement range of the second end of the rotating shaft 21. The second end of the rotating shaft 21 is inserted into the first limiting hole 12. The second end of the swing arm 3 is provided with a second limiting hole 31 to match the displacement range of the second end of the rotating shaft 21 relative to the swing arm 3. The second end of the rotating shaft 21 is inserted into the second limiting hole 31. In this way, through the structures of the first limiting hole 12 and the second limiting hole 31, the mutual constraint between the swing arm 3 and the rotating shaft 21 is realized, so that the second end of the rotating shaft 21 can swing left and right on the bracket 1. Since the box body in this embodiment adopts the structure of an upper box body and a lower box body that are mutually buckled, an upward opening can be provided at the upper edge position of the upper box body. Thus, after the upper box body and the lower box body are joined together, this opening forms the first limiting hole 12. This opening structure facilitates the assembly of the rotating shaft 21.

[0042] In order to further ensure the clamping force on the pen, a first clamping plate 5 and a second clamping plate 6 that can be opened and closed relative to each other are horizontally slidably arranged in the box body. The first clamping plate 5 and the second clamping plate 6 can be arranged in a left-right symmetric manner or a front-back symmetric manner according to needs, and the first clamping plate 5 and the second clamping plate 6 are arranged in the upper box body. A second elastic member 7 is provided between the first clamping plate 5 and the box body and between the second clamping plate 6 and the box body. The second elastic member 7 has a tendency of elastic force to horizontally push the first clamping plate 5 and the second clamping plate 6, and the second elastic member 7 has a tendency to elastically press the first clamping plate 5 and the second clamping plate 6 to be relatively closed. In this way, based on the tendency force of the second elastic member 7, the first clamping plate 5 and the second clamping plate 6 have a tendency to approach each other and clamp the pen passing between them. Notches 56 that can form pores when combined are respectively provided on the opposite sides of the first clamping plate 5 and the second clamping plate 6. The diameter of the pores formed by the notches 56 on the first clamping plate 5 and the second clamping plate 6 when they are closed together is smaller than the minimum diameter of the existing pen.

[0043] In order to ensure the stability of the horizontal movement of the first clamping plate 5 and the second clamping plate 6, a reset assembly 8 is provided on the outside of the box body corresponding to the first clamping plate 5 and the second clamping plate 6. The outer ends of the first clamping plate 5 and the second clamping plate 6 are respectively constrained by inclined surface cooperation with the upper ends of the corresponding reset assembly 8. The reset assembly 8 is arranged in the box body so as to be movable up and down through a third elastic member 9, and the third elastic member 9 has a tendency to elastically press the reset assembly 8 to move upward. Based on the upward tendency force of the third elastic member 9 on the reset assembly 8, there will correspondingly be a tendency to push the first clamping plate 5 and the second clamping plate 6 to approach each other inward, thereby further supplementing the clamping force of the first clamping plate 5 and the second clamping plate 6, and at the same time, based on the inclined surface cooperation, to ensure the direction stability of the horizontal displacement of the first clamping plate 5 and the second clamping plate 6.

[0044] The reset assembly 8 specifically includes a fixed seat 81 arranged in the box body, and a reset block 82 that is movably constrained in the fixed seat 81 along the up and down direction. The third elastic member 9 is arranged between the reset block 82 and the fixed seat 81. The outer ends of the first clamping plate 5 and the second clamping plate 6 are respectively constrained by inclined surface cooperation with the upper ends of the reset block 82 in the corresponding reset assembly 8. Limiting grooves 13 with upward openings are provided on the left and right sides of the box body, and the reset assembly 8 is arranged in the limiting grooves 13.

[0045] In addition, a turntable 4 is rotatably arranged on the bracket 1 corresponding to the central axis of the through hole 11. A jack 41 matching the through hole 11 is opened on the turntable 4, and the pen can be inserted into the jack 41. In this embodiment, in order to facilitate the rotational installation of the gear 23 on the bracket 1, a limiting plate 42 extends downward along the edge of the jack 41 on the turntable 4. The limiting plate 42 is embedded in the through hole 11, and the limiting plate 42 surrounds to form a tubular structure to guide the pen to be inserted. In this way, while meeting the rotational movement of the turntable 4, it does not affect the insertion of the pen.

[0046] In each clamping assembly 20, a gear 23 is sleeved on the first end of the rotating shaft 21, and the gear 23 meshes with the turntable 4. The rack structure form on the turntable 4 is specifically set according to needs. For example, Figure 2 as shown, a plurality of racks 43-1 inclined relative to the radial direction are arranged on the turntable 4 in the circumferential direction. Or as Figure 6 shown, a plurality of helically curved racks 43-2 are arranged on the turntable 4 in the circumferential direction. The helically curved racks 43-2 can reduce the pen feeding speed and have a better feel when manually operating and driving the turntable. A driving member drivingly connected to the turntable 4 is also provided on the pencil sharpener. During use, the driving member drives the turntable 4 to rotate forward or backward. Correspondingly, based on the mutual meshing of the turntable 4 and the gear 23, the gear 23 will be driven to rotate, so that the two clamping assemblies 20 perform the operations of feeding and retracting the pen based on the friction with the pen.

[0047] The specific use process of this pencil sharpening is as follows.

[0048] The user inserts the pen through the through hole 11 on the top plate of the box body. When passing through the first clamping plate 5 and the second clamping plate 6, the pen will enter the gap formed by the notches 56 on the first clamping plate 5 and the second clamping plate 6, and then expand the first clamping plate 5 and the second clamping plate 6 outward and continue to move downward. At this time, the first clamping plate 5 and the second clamping plate 6 move outward in the left-right horizontal direction. At this time, the second elastic member 7 will be compressed. At the same time, as the first clamping plate 5 and the second clamping plate 6 move outward horizontally, based on the inclined surface cooperation between the first clamping plate 5, the second clamping plate 6 and the reset assembly 8, the reset block 82 in the reset assembly 8 will be pushed downward. As the reset block 82 moves downward, the third elastic member 9 will be compressed. Based on the elastic tendency forces of the second elastic member 7 and the third elastic member 9, a tendency force of relatively approaching the first clamping plate 5 and the second clamping plate 6 will be generated, thereby realizing the clamping effect on the pen.

[0049] With the downward insertion force of the user on the pen, the pen continues to move downward. When passing through the gap between the two clamping assemblies 20, due to the friction between the pen and the clamping assemblies 20, the two clamping assemblies 20 will be driven to rotate on the bracket 1, and at the same time, the pen expands the two clamping assemblies 20 outward and continues to move downward. When the pen expands the two clamping assemblies 20, the pen generates a thrust force on the clamping assemblies 20 to move outward in the left-right direction. Since the first end of the rotating shaft 21 in the clamping assembly 20 is rotatably arranged on the bracket 1 with a relatively fixed position, the second end of the rotating shaft 21 will be correspondingly pushed outward, thereby driving the swing arm 3 to swing, so that the first elastic clip is in a pulled-open state. Furthermore, the first elastic member 30 will generate a tendency force to pull the second end of the swing arm 3 to reset and make the two clamping assemblies 20 relatively approach, so as to play the clamping role on the pen.

[0050] After the pen is clamped between two sets of clamping components 20, according to the specific function settings of the pencil sharpener, the driving turntable 4 rotates. Based on the meshing effect between the turntable 4 and the gear 23, the gear 23 will be driven to rotate, and then the turntable will rotate, correspondingly driving the two clamping components 20 to rotate relative to each other. Relying on the frictional force between the clamping component 20 and the pen, the pen is driven to continue to move downward to the position of the pencil sharpening tool. Based on the clamping effect of the clamping mechanism 2, the first clamping plate 5, and the second clamping plate 6 on the pen, the stability of the pen position is ensured, and thus the pencil sharpening work on the pen is realized. After the pencil sharpening work is completed, the turntable 4 is driven to reverse, and correspondingly the two sets of clamping components 20 will rotate relative to each other in the reverse direction. Relying on the frictional force between the clamping component 20 and the pen, the pen is driven to move upward until it is disengaged from the clamping mechanism 2. Correspondingly, the position of the swing arm 3 and the first elastic member 30 are reset, and the two rotating shafts 21 are reset to the initial position under the restraint of the swing arm 3, that is, the two sets of clamping components 20 are fitted together. At this time, the user only needs to overcome the clamping force of the first clamping plate 5 and the second clamping plate 6 on the pen to pull out the pen from the through hole 11. After the pen is pulled out, the first clamping plate 5 and the second clamping plate 6 are reset under the action of the reset component 8 and the second elastic member 7.

[0051] In the pencil sharpener of the present utility model, the swing arm 3 is provided to cooperate with the first elastic member 30 to realize the opening and closing restraint of the two sets of clamping components 20 in the clamping mechanism 2. When the torque required by the clamping component 20 is determined, based on the swing arm 3, the lever arm length of the clamping component 20 is increased. Correspondingly, when inserting the pen between the two clamping components 20, less force is required, and the pen insertion operation by the user is more labor-saving, but the clamping torque of the clamping mechanism 2 on the pen remains stable.

[0052] On this basis, the swing arm 3 is constrained and linked with the end of the rotating shaft 21 far from the gear 23. In this way, when the swing arm 3 drives the rotating shaft 21 to swing open and close, the displacement of the gear 23 is very small, and correspondingly the influence on the meshing stability between the gear 23 and the turntable 4 is also very small, which can ensure the meshing stability between the gear 23 and the turntable 4 and avoid the situation of relative jamming.

[0053] In the description and claims of the present utility model, terms indicating directions such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various example structural parts and elements of the present invention. However, these terms are used here only for the purpose of convenient description and are determined based on the example orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity.

Claims

1. A pencil sharpener, comprising The support (1) has a through hole (11) for the pen to pass through; The clamping mechanism (2) comprises two groups of clamping assemblies (20) arranged in a left-right direction and arranged in parallel, and the two clamping assemblies (20) are rotatably arranged on the bracket (1) with respect to the center of the through hole (11) in a symmetrical manner; Features: Also includes A swing arm (3) is provided corresponding to each clamping assembly (20), the first end of the swing arm (3) is rotatably connected to the bracket (1), the second end of the swing arm (3) is constrained to the second end of the clamping assembly (20) to drive the clamping assembly (20) to swing in the left and right directions, and the second end of the swing arm (3) is connected to the bracket (1) through a first elastic member (30), and the first elastic member (30) has a tendency to pull the second end of the swing arm (3) closer to another clamping assembly (20).

2. The pencil sharpener according to claim 1, characterized in that: The clamping assembly (20) comprises a rotating shaft (21) and a clamping sleeve (22) sleeved on the rotating shaft (21); The first end of the rotating shaft (21) is rotatably positioned on the bracket (1), and the second end of the rotating shaft (21) is constrained to the second end of the swing arm (3).

3. The pencil sharpener according to claim 2, characterized in that: The bracket (1) is provided with a first limiting hole (12) matching the left-right displacement range of the second end of the rotating shaft (21), and the second end of the rotating shaft (21) is inserted into the first limiting hole (12); The second end of the swing arm (3) is provided with a second limiting hole (31) matching the displacement range of the second end of the rotating shaft (21) relative to the swing arm (3), and the second end of the rotating shaft (21) is inserted into the second limiting hole (31).

4. The pencil sharpener according to claim 2, characterized in that: A turntable (4) is rotatably arranged on the bracket (1) corresponding to the central axis of the through hole (11), and a plug hole (41) matching the through hole (11) is provided on the turntable (4); The first end of the rotating shaft (21) in each set of clamping components (20) is sleeved with a gear (23), and the gear (23) is meshed with the rotating disk (4).

5. The pencil sharpener according to claim 4, characterized in that: A limit plate (42) extends downwardly from the edge of the insertion hole (41) on the rotating disk (4), and the limit plate (42) is embedded in the through hole (11); The rotating disk (4) is provided with a plurality of racks inclined relative to the radial direction along the circumferential direction, or the rotating disk (4) is provided with a plurality of racks that are spirally bent along the circumferential direction.

6. The pencil sharpener according to any one of claims 1 to 5, characterized in that: The support (1) is a box body having a receiving cavity, and the through hole (11) passes through the top plate and the bottom plate of the box body; The clamping mechanism (2) is arranged in the accommodating cavity, and the two groups of clamping components (20) of the clamping mechanism (2) are rotatably supported on the front panel and the rear panel of the box body, and the swing arms (3) corresponding to the two groups of clamping components (20) are rotatably arranged on the front side wall and the rear side wall of the box body respectively.

7. The pencil sharpener according to claim 6, characterized in that: A first clamping plate (5) and a second clamping plate (6) are horizontally slidably arranged in the box body and can be relatively opened and closed. A second elastic member (7) is arranged between the first clamping plate (5) and the box body, and between the second clamping plate (6) and the box body. The second elastic member (7) has a tendency to press the first clamping plate (5) and the second clamping plate (6) to be relatively aligned. Notches (56) which can be combined into a hole when matched are respectively provided on the opposite sides of the first clamping plate (5) and the second clamping plate (6).

8. The pencil sharpener according to claim 7, characterized in that: The outer sides of the box body corresponding to the first clamping plate (5) and the second clamping plate (6) are provided with a reset assembly (8), and the outer ends of the first clamping plate (5) and the second clamping plate (6) are respectively restrained and arranged with the upper ends of the corresponding reset assembly (8) through inclined plane matching; The reset component (8) is arranged in the box body so as to be movable up and down via a third elastic member (9), and the third elastic member (9) has a tendency to press the reset component (8) to move upward.

9. The pencil sharpener according to claim 8, characterized in that: The reset assembly (8) comprises a fixed seat (81) arranged in the box body, and a reset block (82) movably constrained on the fixed seat (81) in the up-down direction, and the third elastic member (9) is arranged between the reset block (82) and the fixed seat (81); The outer ends of the first clamping plate (5) and the second clamping plate (6) are respectively arranged to be restrained by the upper ends of the reset blocks (82) in the corresponding reset components (8) through inclined plane matching.

10. The pencil sharpener according to claim 8 or 9, characterized in that: The box body is provided with a limiting groove (13) which opens upward, and the reset assembly (8) is arranged in the limiting groove (13).

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