Self-adaptive clamping mechanism of pencil sharpener and pencil sharpener

Abstract

The utility model provides a pencil sharpener self-adaptation clamping mechanism and pencil sharpener, the self-adaptation clamping mechanism comprises an inlet piece, a turntable piece, a clamping assembly, a support assembly and an elastic part, the inlet piece, the turntable piece, the clamping assembly and the support assembly are sequentially arranged from top to bottom, and are provided with coaxial through holes for the pencil to pass through, the through hole in the center of the clamping assembly is a pen passing hole with the variable size, and the inlet piece and the rotating disc piece are elastically connected through the elastic piece.

Description

Technical Field

[0001] The utility model relates to the field of stationery, in particular to an adaptive clamping mechanism of a pencil sharpener and the pencil sharpener. Background Art

[0002] As a pencil sharpening tool, the pencil sharpener is very popular among office workers and students. The pencil sharpener mainly includes an adaptive pen feed mechanism and a sharpening hook. When sharpening a pencil, the pencil is passed through the adaptive pen feed mechanism and into the sharpening mechanism. After the pencil is in place, it is clamped by the adaptive pen feed mechanism, and then the sharpening mechanism cuts the pencil tip. After the pencil is sharpened, the adaptive pen feed mechanism can also remove the pencil from the pencil sharpener.

[0003] Due to various demands in the current market, the appearance of pencils is becoming more and more diverse. The adaptive pen feeding mechanism of conventional pencil sharpeners can no longer meet the needs of cutting diverse pencils. In order to cope with this situation, a clamping mechanism using a lever mechanism for clamping has emerged. This structure needs to increase the length of the lever to ensure power, and the required assembly space is large, which increases the material cost and increases the overall size of the pencil sharpener, which is contrary to the development trend of pencil sharpeners. In addition, the lever mechanism has an extra transmission mechanism, which reduces the transmission power efficiency, and the transmission of the adaptive pen feeding mechanism is unstable, and the transmission wheel is prone to swing, resulting in unsatisfactory pencil sharpening effect. Utility Model Content

[0004] The utility model aims to provide an adaptive pen feeding mechanism to solve the problems of large volume, redundant structure, low rotation efficiency, unstable transmission and high cost of the existing pencil sharpener.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A self-adaptive clamping mechanism for a pencil sharpener comprises an inlet member, a turntable member, a clamping assembly, a supporting assembly and an elastic part, wherein the inlet member, the turntable member, the clamping assembly and the supporting assembly are arranged in sequence from top to bottom and are provided with coaxial through holes for pencils to pass through, wherein the through hole at the center of the clamping assembly is a pen-passing hole of variable size, the inlet member and the turntable member are elastically connected by an elastic member, the clamping assembly comprises at least a clamping unit member, the turntable member abuts against each clamping unit member, the turntable member can rotate relative to the inlet member, and the clamping mechanism has two states: a pen-in state and a pen-out state, specifically: in the pen-in state: the clamping unit member is pushed by the pencil cutting surface, the pen-passing hole gradually becomes larger, and the clamping unit member pushes the turntable member to overcome the elastic force of the elastic member to rotate around the axis, at which time the elastic member is in a first stretched state, and the turntable member rotates from the first position to the second position;

[0007] In the pencil withdrawal state: the pen hole gradually becomes smaller, the turntable is pulled back from the second position to the first position under the elastic force of the elastic member, the turntable pushes the clamping unit to rotate, and pushes the cutting surface of the pencil to withdraw, at this time the elastic member is in the second stretching state;

[0008] The stretching force in the first stretching state is greater than the stretching force in the second stretching state.

[0009] Furthermore, the number of clamping units is 3.

[0010] Furthermore, the elastic member is a tension spring.

[0011] Furthermore, the inlet piece is fixed relative to the pencil sharpener housing, the inlet piece includes an inlet piece slide groove, the turntable piece includes a first turntable protrusion, the first turntable protrusion extends axially upward, and the first turntable protrusion can cooperate with the inlet piece slide groove and slide along the track of the inlet piece slide groove.

[0012] Further, the turntable component includes a turntable second protrusion, the turntable second protrusion extends downward in the axial direction, the clamping unit component includes a clamping member protrusion, and the second protrusion abuts against the clamping member protrusion.

[0013] Furthermore, the support member includes a support cover plate, a rotating member and a bottom shell. The rotating member is rotatably accommodated between the support cover plate and the bottom shell, and power can be transmitted to the clamping unit member through the rotating member.

[0014] Furthermore, the clamping unit comprises a clamping wheel, and the outer surface of the clamping wheel is in rolling contact with the pencil.

[0015] Furthermore, the clamping wheel is made of soft elastic material.

[0016] A pencil sharpener comprises a clamping mechanism, a motor, a shell, and a cutter. The clamping mechanism, the motor, and the cutter are all accommodated in the shell. The motor is connected to a support member, and the motor drives at least a part of the components of the support member to rotate, thereby inputting power to the clamping unit component.

[0017] Preferably, the soft elastic material used is usually vinyl rubber (Ethylene Propylene Rubber, referred to as EPDM) or silicone. These two materials are relatively soft, wear-resistant, high-temperature resistant, and have good elasticity and grip, which can ensure that the pencil can be rotated and cut steadily in the pencil sharpening mechanism.

[0018] The utility model provides an adaptive pen feeding mechanism and a pencil sharpener, which have the following beneficial effects compared with the prior art: the pen-passing hole of the clamping mechanism is at least two groups of clamping wheel assemblies evenly arranged on the periphery of the pencil, and the surface of the clamping wheel is always in a state of contact with the surface of the pencil through the design of the clamping mechanism, so the size of the pen-passing hole can be automatically adjusted according to the size of the wound pencil to adapt to clamping pencils of different diameters; in addition, the clamping force of the structure is directly provided to the turntable through the elastic member, and then transmitted to the clamping wheel assembly by the turntable, so the power transmission process is short, the power loss is small, and the power transmission efficiency can be effectively improved; externally, this type of structure can effectively reduce the strength requirements of the structural parts, thereby saving materials and saving costs, and in addition, the structure is more compact, smaller in size, and has strong independence and high integration, and can be adapted to various types of pencil sharpeners.

[0019] The principle and structure of the structure are simple, low cost, stable and reliable, highly adaptable, and highly integrated, and effectively solve the problems of unstable clamping, poor cutting effect, and excessive volume of the current adaptive pen feeding mechanism of the pencil sharpener. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above technical content of the utility model and the following specific implementation methods will be better understood when read in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only examples of the technical solutions claimed for protection. In the accompanying drawings, the same reference numerals represent the same or similar elements.

[0021] Figure 1 It is a schematic diagram of the exploded view of the clamping mechanism (top-down perspective);

[0022] Figure 2 It is a schematic diagram of the exploded view of the clamping mechanism (from the bottom up perspective);

[0023] Figure 3 It is a schematic diagram of the assembly diagram of the clamping unit;

[0024] Figure 4 It is a three-dimensional schematic diagram of the bracket (from the bottom to the top);

[0025] Figure 5 is a three-dimensional schematic diagram of the bracket (top-down perspective);

[0026] Figure 6 It is a schematic diagram of the entrance piece;

[0027] Figure 7 is a schematic diagram of the turntable (top-down perspective);

[0028] Figure 8 is a schematic diagram of the turntable component (bottom-up perspective);

[0029] Fig. 9 is a schematic diagram of an elastic member;

[0030] Fig.10 is a schematic diagram of the support cover (top-down perspective);

[0031] Fig.11 is a schematic diagram of the support cover (from bottom to top perspective);

[0032] Fig.12 is a schematic diagram of a rotating part (top-down perspective);

[0033] Fig.13 is a schematic diagram of a rotating part (bottom-up perspective);

[0034] Fig.14 It is a schematic diagram of the bottom shell;

[0035] Fig.15 is a schematic diagram of the clamping mechanism when no pencil is inserted (top-down perspective);

[0036] Fig.16 is a schematic diagram of the clamping mechanism when no pencil is inserted (bottom-up perspective);

[0037] Fig.17 is a schematic diagram of the clamping mechanism when inserting a pencil (top-down perspective);

[0038] Fig.18 Schematic diagram of the clamping mechanism when inserting a pencil (bottom-up perspective).

[0039] The reference numerals are described as follows:

[0040] Entry pieces: 100

[0041] Entrance member chute: 110 Fixed block: 120 Entrance member assembly hole: 130 Turntable member: 200 Turntable chute: 210 Turntable first protrusion: 220 Turntable second protrusion: 230 Clamping assembly: 30 Clamping unit member: 300 Bracket: 310 Bracket first hole: 311 Bracket second hole: 312 Bracket third hole: 313 Cavity: 315 Clamping wheel: 320 Transmission member: 330 Worm: 331

[0042] Gear: 332 Clamping axle: 340 Bracket protrusion: 350 Protrusion contact surface: 351 Clamping part protrusion: 360 Support part: 400 Support cover: 410 Cover assembly hole: 411 Rotating part: 420 Gear: 421 Rotating connecting part: 422 Keyway: 423 Bottom shell: 430

[0043] Bottom shell assembly holes: 431

[0044] Bottom shell center hole: 432

[0045] Elastic parts: 500

[0046] Pen hole: 600 DETAILED DESCRIPTION

[0047] The detailed features and advantages of the present invention are described in detail in the specific implementation modes below, and the content is sufficient to enable any technical personnel in this field to understand the technical content of the present invention and implement it accordingly. According to the description, claims and drawings disclosed in this specification, the technical personnel in this field can easily understand the relevant purposes and advantages of the present invention.

[0048] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0049] In the description of this embodiment, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships that are defined with reference to the coordinates of the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0051] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0052] Figure 1 , Figure 2 The figure shows an exploded view of the clamping mechanism from different viewing angles. The clamping mechanism comprises, from top to bottom, an inlet member 100, a turntable member 200, a clamping assembly 30, and a support member 400.

[0053] Figure 3 The figure shows an exploded view of the clamping unit component 300 from the bottom up, which includes: a bracket 310, a clamping wheel 320, a transmission member 330 and a clamping wheel shaft 340, wherein the bracket 310 includes a cavity structure, the clamping wheel 320, the transmission member 330 and at least a portion of the clamping wheel shaft 340 are accommodated in the bracket 310, the clamping wheel 320 is sleeved on the clamping wheel shaft 340, and the transmission member 330 transmits the power output by the motor to the clamping wheel 320.

[0054] Figure 4 , Figure 5The figure is a three-dimensional schematic diagram of the bracket. As can be seen from the figure, the bracket 310 includes a first bracket hole 311, a second bracket hole 312 and a third bracket hole 313, as well as a bracket protrusion 350 and a protrusion contact surface 351 on the bracket protrusion 350 and a cavity 315. At least a part of other components in the clamping unit is accommodated in the cavity 315. The two ends of the clamping axle 340 are respectively accommodated in the first bracket hole 311 and the second bracket hole 312, so that the clamping axle 340 can be rotatably installed on the bracket 310. The side of the bracket includes a bracket protrusion 350. Specifically, the bracket protrusion 350 is a protrusion that is approximately a triangular prism. The upper surface of the bracket 310 includes a third bracket hole 313, and the third bracket hole 313 can accommodate the upper end of the worm column of the worm 331.

[0055] Figure 6 Schematic diagram of the inlet member 100, including the inlet member slot 110, the first turntable protrusion 220, and the first mounting hole 113. Specifically, the inlet member slot 110 is a circular arc segment slot, and the first turntable protrusion 220 is a cylindrical protrusion extending upward along the axis.

[0056] Figure 7 , Figure 8 Schematic diagram of a turntable member 200, including a turntable slot 210, a first turntable protrusion 220 and a second turntable protrusion 230, wherein the first turntable protrusion 220 is a protrusion extending upward, and the second turntable protrusion 230 is a protrusion extending downward. Specifically, the turntable slot 210 is a circular arc segment slot, and the first turntable protrusion 220 is a cylindrical protrusion.

[0057] Fig. 9 Schematic diagram of the elastic member 500 . Specifically, the elastic member 500 may be a tension spring.

[0058] Figure 7 , Figure 8 3 is a schematic three-dimensional diagram of the rotating disk 321. As shown in the figure, the rotating disk 321 includes three mounting holes along the circumference and a cavity structure on the back.

[0059] Fig.10 , Fig.11 4 is a three-dimensional schematic diagram of a support cover plate 410 . As shown in the figure, the support cover plate 410 includes a cover plate assembly hole 411 along the circumferential direction.

[0060] Fig.12 , Fig.13 4 is a three-dimensional schematic diagram of a rotating member 420 . The outer periphery of the rotating member 420 includes gear teeth 421 , and a rotating connecting member 422 extends axially downward. The inner ring of the rotating connecting member 422 includes a keyway 423 .

[0061] Fig.14 It is a schematic diagram of the three-dimensional structure of the bottom shell 430, and three bottom shell assembly holes 431 are distributed along the circumference.

[0062] Clamping mechanism assembly process

[0063] Combination Figure 1 to Figure 14 The first protrusion 220 of the turntable extends out of the inlet piece slot 110, and the first protrusion 220 of the turntable is connected to the fixed block 120 by an elastic member 500, and then the second protrusion 230 of the turntable is abutted against the bracket protrusion 350, and the upper end of the worm 331 extends upward from the turntable slot 210 and penetrates all the way to the inlet piece assembly hole 130, and the lower end of the worm 331 passes through the cover plate assembly hole 411 of the support cover plate, and the lower end of the worm 331 is circumferentially provided with gear teeth that mesh with the gear teeth 421 provided on the outer periphery of the rotating member 420, and the rotating member 420 includes a rotating connecting member 422 below. Specifically, the rotating connecting member 422 is cylindrical and passes through the bottom shell assembly hole 432, so that the rotating member 420 can rotate relative to the bottom shell 430, and the inner wall of the rotating connecting member 422 includes a keyway 423, which can be connected to the power input end to achieve synchronous rotation.

[0064] Fig.15 , Fig.16 The figure shows a schematic diagram of the clamping mechanism when no pencil is inserted. In this state, the first protrusion 220 of the turntable rotates in the clockwise direction under the tension of the tension spring, and the second protrusion 230 of the turntable is pressed on the protrusion contact surface 351 of the clamping unit 300, pushing the clamping unit 300 to rotate in the clockwise direction around the axis of the worm 331, thereby driving the clamping wheel 320 to the center of the pen hole 600, and finally the clamping wheels 320 are balanced against each other to form the smallest pen hole 600. At this time, the turntable member 200 is in the first position.

[0065] Fig.17 , Fig.18 The figure shows a schematic diagram of the pencil being inserted into the clamping mechanism. When the pencil is inserted, when the surface to be cut contacts the surface of the clamping wheel 320, the pencil can be rolled into the pen hole 600 under the action of the rotational force of the clamping wheel 320. At the same time, the clamping wheel 320 generates a radially outward thrust under the reaction force of the pencil surface to be cut, thereby driving the clamping unit 300 to rotate counterclockwise along the axis of the worm 331, and at the same time enlarging the pen hole 600. At the same time, due to the contact between the protrusion contact surface 351 on the bracket protrusion 350 and the second protrusion 230 of the rotating disk, the rotating disk 200 overcomes the elastic force of the tension spring under the reaction force of the clamping unit 300 and rotates counterclockwise, and at the same time pushes the tension spring to lengthen until the cutting surface completely passes through the pen hole 600. At this time, the rotating disk 200 is in the second position.

[0066] After the pencil is sharpened, when the clamping wheel 320 reverses and the pencil is withdrawn from the pen hole 600, the turntable 200 rotates clockwise under the tension of the tension spring and pushes the second turntable protrusion 230 through the bracket protrusion 350 to drive the entire clamping unit component back to the initial state.

[0067] Working principle of clamping mechanism

[0068] The entrance piece 100 includes an entrance piece slot 110 at a radius R1, and the first turntable protrusion 220 of the turntable piece 200 is also arranged at a radius R1. The first turntable protrusion 220 can extend out of the entrance piece slot 110 and cooperate with the entrance piece slot 110 so that the first turntable protrusion 220 can slide in the entrance piece slot 110, and the rotating fixed block 120 and the first turntable protrusion 220 are connected by the elastic piece 500, so that relative rotation can occur between the entrance piece 100 and the turntable piece 200. In each clamping unit 300 in the clamping assembly 30, the upper end of the worm 331 can extend from the third hole 313 of the bracket, and the upper end of the worm 331 can sequentially penetrate the turntable slide 210 and the inlet assembly hole 130. Optionally, in addition to using the upper end of the worm 331 to penetrate, a cylindrical body that can be adapted to penetrate the slide 210 and the inlet assembly hole 130 can also be directly arranged at the corresponding position of the bracket 310. The lower end of the worm 331 passes through the base assembly hole 431, and the lower end of the worm 331 circumferentially includes a gear structure, which can mesh with the gear 421 circumferentially arranged on the rotating member 420. A rotating connecting member 422 is included below the rotating member 420. Specifically, the rotating connecting member 422 is cylindrical and passes through the bottom shell assembly hole 432, so that the rotating member 420 can rotate relative to the bottom shell 430. The inner wall of the rotating connecting member 422 includes a key slot 423, which can be connected to a power input end (such as a motor, not shown in the figure) to achieve synchronous rotation.

[0069] The initial state of the clamping mechanism is as follows Fig.15 and Fig.16 As shown, the turntable member 200 rotates in the clockwise direction under the pulling force of the elastic member 500, and the second protrusion 230 of the turntable is pressed on the protrusion contact surface 351 of the clamping unit member 300, pushing the clamping unit member 300 to rotate in the clockwise direction around the axis of the worm 331, and then driving the clamping wheel 320 to the center of the pen hole 600. Finally, the clamping wheels 320 are balanced against each other to form the smallest pen hole 600. At this time, the turntable member 200 is in the first position, and the elastic member 500 is in the first tension state.

[0070] When a pencil is inserted, when the surface to be cut contacts the surface of the clamping wheel 320, the pencil can be rolled into the pen hole 600 under the action of the rotational force of the clamping wheel 320, and the clamping wheel 320 generates a radially outward thrust under the reaction force of the pencil surface to be cut, thereby driving the clamping unit 300 to rotate counterclockwise along the axis of the worm 331, and at the same time making the pen hole 600 larger. At the same time, because the contact surface 351 of the protrusion 350 on the bracket and the second protrusion 230 of the rotating disk are abutted, the rotating disk 200 overcomes the elastic force of the tension spring under the reaction force of the clamping unit 300 and rotates counterclockwise, and at the same time pushes the tension spring to lengthen until the cutting surface completely passes through the pen hole 600. At this time, the rotating disk 200 is in the second position, and the elastic member 500 is in the second tension state.

[0071] It is easy to understand that the tension of the elastic member 500 in the second tension state is greater than the tension in the first tension state.

[0072] After the pencil is sharpened, when the clamping wheel 320 reverses and the pencil is withdrawn from the pen hole 600, the turntable component 200 rotates clockwise under the tension of the tension spring and pushes the second turntable protrusion 230 through the bracket protrusion 350 to drive the entire clamping unit component 300 back to the initial state.

[0073] Industrial Applicability

[0074] The utility model provides an adaptive pen feeding mechanism and a pencil sharpener, which have the following beneficial effects compared with the prior art: the pen-passing hole of the clamping mechanism is at least two groups of clamping wheel assemblies evenly arranged on the periphery of the pencil, and the surface of the clamping wheel is always in a state of contact with the surface of the pencil through the design of the clamping mechanism, and has strong adaptability, and can automatically adjust the size of the pen-passing hole according to the size of the wound pencil to adapt to clamping pencils of different diameters; the clamping force of the structure is directly provided to the turntable through the elastic member, and then transmitted to the clamping assembly by the turntable, the power transmission process is short, the power loss is small, and the power transmission efficiency can be effectively improved; in addition, this type of structure can effectively reduce the strength requirement of the structural parts, thereby saving materials and saving costs, and in addition, the structure is more compact, smaller in size, and highly independent, and can be adapted to various types of pencil sharpeners.

[0075] The structure has the advantages of simple principle, low cost, stability, reliability and strong adaptability, and effectively solves the problems of unstable clamping and poor cutting effect of the adaptive pen feeding mechanism of the current pencil sharpener.

[0076] The terms and expressions used here are for description only, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or parts thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, changes and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

[0077] Similarly, it should be pointed out that although the utility model has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the utility model, and various equivalent changes or substitutions can be made without departing from the spirit of the utility model. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the utility model, they will fall within the scope of the claims of the utility model.

Claims

1. An adaptive clamping mechanism for a pencil sharpener, characterized in that: The invention comprises an inlet member (100), a rotating disk member (200), a clamping assembly (30), a supporting member (400) and an elastic member (500), wherein the inlet member (100), the rotating disk member (200), the clamping assembly (30) and the supporting member (400) are arranged in sequence from top to bottom and are provided with coaxial through holes for pencils to pass through, wherein the through hole at the center of the clamping assembly (30) is a pen-passing hole (600) of variable size, the inlet member (100) and the rotating disk member (200) are elastically connected by the elastic member (500), the clamping assembly (30) comprises at least two clamping unit members (300), the rotating disk member (200) abuts against each of the clamping unit members (300), the rotating disk member (200) can rotate relative to the inlet member (100), and the clamping mechanism has two states: a pen-in state and a pen-out state, specifically: In the pencil-in state: the clamping unit component (300) is pushed by the pencil cutting surface, the pen hole (600) gradually becomes larger, and the clamping unit component (300) pushes the rotating disk component (200) to overcome the elastic force of the elastic component (500) and rotate around the axis, at which time the elastic component (500) is in a first stretched state, and the rotating disk component (200) rotates from the first position to the second position; In the pencil withdrawal state: the pen hole (600) gradually becomes smaller, the rotating disk (200) is pulled back from the second position to the first position under the elastic force of the elastic member (500), the rotating disk (200) pushes the clamping unit (300) to rotate, and pushes the cutting surface of the pencil to withdraw, and at this time the elastic member (500) is in a second stretched state; The stretching force in the first stretching state is greater than the stretching force in the second stretching state.

2. The adaptive clamping mechanism of a pencil sharpener according to claim 1, characterized in that: The number of the clamping units (300) is 3.

3. The adaptive clamping mechanism of a pencil sharpener according to claim 2, characterized in that: The elastic member (500) is a tension spring.

4. The adaptive clamping mechanism of a pencil sharpener according to claim 3, characterized in that: The inlet member (100) is fixed relative to the pencil sharpener housing, the inlet member (100) comprises an inlet member slide groove (110), the turntable member (200) comprises a turntable first protrusion (220), the turntable first protrusion (220) extends upward in the axial direction, and the turntable first protrusion (220) can cooperate with the inlet member slide groove (110) and slide along the track of the inlet member slide groove (110).

5. The adaptive clamping mechanism of a pencil sharpener according to claim 4, characterized in that: The turntable component (200) comprises a turntable second protrusion (230), the turntable second protrusion (230) extends downward in the axial direction, and the clamping unit component (300) comprises a clamping component protrusion (350), the second protrusion (230) and the clamping component protrusion (350) are in abutment with each other.

6. The adaptive clamping mechanism of a pencil sharpener according to claim 5, characterized in that: The support member (400) comprises a support cover plate (410), a rotating member (420) and a bottom shell (430); the rotating member (420) is rotatably accommodated between the support cover plate (410) and the bottom shell (430); and power can be transmitted to the clamping unit member (300) through the rotating member (420).

7. The adaptive clamping mechanism of a pencil sharpener according to claim 2, characterized in that: The clamping unit (300) comprises a clamping wheel (320), and the outer surface of the clamping wheel (320) is in rolling contact with the pencil.

8. The adaptive clamping mechanism of a pencil sharpener according to claim 7, characterized in that: The clamping wheel (320) is made of soft elastic material.

9. A pencil sharpener, comprising the clamping mechanism according to any one of claims 1 to 8, characterized in that: It also includes a motor, a housing, and a tool. The clamping mechanism, the motor, and the tool are all accommodated in the housing. The motor is connected to the support member (400), and the motor drives at least a part of the components of the support member (400) to rotate, thereby inputting power to the clamping unit component (300).

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