Three-wheel pencil feeding mechanism of pencil sharpener

Abstract

The utility model discloses a three-wheel pencil feeding mechanism of a pencil sharpener. The three-wheel pencil feeding mechanism comprises a base plate, a shell with a pencil inserting hole, shifting teeth, three worms and a three-wheel pencil feeding device. The chassis and the shell are connected to form a cavity; the shifting tooth can be assembled in the middle of the chassis and comprises a middle through hole connected with the tool rest and peripheral teeth; the three worms are distributed on the periphery of the peripheral teeth, and a worm gear is arranged at the lower end of each worm; each worm gear is meshed with peripheral teeth of the shifting teeth at the same time; the three-wheel pen feeding device comprises three pen clamping assemblies, each pen clamping assembly comprises a transmission shaft, one end of each transmission shaft is provided with helical teeth matched with the worm, and the other end of each transmission shaft is provided with a pen clamping wheel; a pencil passing space is defined by the three pencil clamping wheels, the caliber of the pencil passing space is smaller than that of the middle through hole, and automatic or semi-automatic stable feeding of pencils in the pencil sharpener is achieved through a transmission mechanism that the three-wheel pencil feeding device is meshed with the worm gear.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pencil sharpener, especially a pencil feeding mechanism of a pencil sharpener. BACKGROUND

[0002] The main function of the pencil feeding mechanism of the pencil sharpener is to automatically or semi-automatically feed the pencil into the pencil sharpener for cutting. The automatic pencil feeding mechanism can reduce the need for manual operation of the user, making the pencil sharpening process more relaxed and labor-saving.

[0003] In terms of structure, the pencil feeding mechanism is installed at the rear side of the pencil insertion hole of the shell and includes a bottom plate, a transmission gear, a worm and gear structure, and a pencil clamping device. The driving device of the pencil sharpener is transmitted to the pencil clamping device through the transmission gear and the worm and gear structure. The pencil clamping device includes two groups of pencil clamping assemblies arranged in parallel with each other, each of which includes a transmission shaft and a pencil feeding wheel arranged on the transmission shaft. The two pencil feeding wheels are used to clamp the outer wall of the pencil. When the pencil feeding wheels rotate, the pencil realizes automatic or semi-automatic feeding and retraction.

[0004] The pencil feeding device of the pencil sharpener of CN113442630A discloses a support, a positioning frame, and a rotating shaft. One side of the support has a transmission disc and a rotating disc. The surface of the rotating disc has a plurality of friction lines. The positioning frame is pivotally connected with a plurality of positioning shafts. The rotating shaft is arranged on the positioning shafts. Each rotating shaft has a pencil clamping roller and a friction wheel. The pencil clamping roller is used to clamp and feed the pencil. The friction wheel can be driven by the friction transmission of the rotating disc.

[0005] The transmission between the rotating disc and the friction wheel relies on the friction lines, and the stability of the transmission is unreliable, which may cause slipping. UTILITY MODEL CONTENTS

[0006] To solve the problem of pencil feeding stability in the prior art, the utility model provides a three-wheel pencil feeding mechanism with reliable transmission and stable pencil feeding.

[0007] The core technical concept of the utility model is to use the transmission mechanism of the three-wheel pencil feeding device meshing with the worm gear to realize automatic or semi-automatic stable feeding of the pencil in the pencil sharpener.

[0008] The technical scheme adopted by the utility model to solve the above technical problem is as follows: a three-wheel pencil feeding mechanism of a pencil sharpener, including a chassis, a shell with a pencil insertion hole, a driving tooth, three worms, and a three-wheel pencil feeding device.

[0009] The chassis and the shell are connected to form a cavity.

[0010] The driving tooth can be assembled in the middle of the chassis. The driving tooth includes a middle through hole connected with the tool holder and a peripheral tooth.

[0011] Three worm gears are distributed on the outer periphery of the peripheral teeth, and the lower end of each worm gear is provided with a worm gear;

[0012] The three-wheel pen feeding device comprises three pen clamping assemblies, each of which comprises a transmission shaft, one end of the transmission shaft is provided with a bevel gear matched with the worm gear, and the other end of the transmission shaft is provided with a pen clamping wheel; the three pen clamping wheels surround a pen passing space, and the caliber of the pen passing space is smaller than that of the middle through hole.

[0013] The further preferred technical scheme of the utility model is that the shell comprises a circumferential side wall and a top wall, three fixing frames are installed between the bottom disc and the top wall, and the fixing frames are used for fixing the end of the worm gear and the end of the transmission shaft.

[0014] The further preferred technical scheme of the utility model is that the fixing frame comprises a base, an upper cross beam and a lower cross beam, a pair of first circular notches for clamping the end of the worm gear are arranged on the upper cross beam and the lower cross beam respectively;

[0015] A pair of second circular notches for clamping the end of the transmission shaft are further arranged on the base; the two first circular notches are vertically distributed, and the two second circular notches are horizontally distributed.

[0016] The outer sides of the first circular notches and the second circular notches are open.

[0017] The further preferred technical scheme of the utility model is that the upper end surface of the upper cross beam is provided with a first clamping part, the first clamping part is clamped into the top wall,

[0018] The lower end surface of the lower cross beam is provided with a second clamping part, and the second clamping part is clamped into the bottom disc.

[0019] The further preferred technical scheme of the utility model is that the poking tooth comprises a tooth part provided with peripheral teeth and a lower extension part, the peripheral teeth are located on the inner side of the bottom disc, the lower edge of the lower extension part is provided with a hook part, and the lower extension part is hooked after passing through the through hole of the bottom disc.

[0020] The further preferred technical scheme of the utility model is that buckle structures are arranged between the shell and the bottom disc.

[0021] The buckle structure comprises a clamping hook at the bottom of the circumferential side wall of the shell and a clamping groove at the corresponding position of the bottom disc, and the clamping hook is matched with the clamping groove.

[0022] Another technical subject is a three-wheel pen feeding mechanism of a pencil sharpener, which comprises a base, a poking tooth, three worm gears, fixing frames and a three-wheel pen feeding device installed on the base;

[0023] The poking tooth is located in the middle of the base, and the poking tooth comprises a middle through hole and peripheral teeth connected with the knife holder;

[0024] Three worm gears are distributed on the outer periphery of the peripheral teeth, each worm gear is installed on a corresponding fixed frame, and a lower end of the worm gear is provided with a worm gear that meshes with the peripheral teeth;

[0025] The three-wheel pen feeding device comprises three pen clamping assemblies, each pen clamping assembly comprises a transmission shaft, one end of the transmission shaft is provided with a helical tooth, and the other end of the transmission shaft is provided with a pen clamping wheel; each pen clamping assembly is installed on a corresponding fixed frame, and the helical tooth is matched with a corresponding worm gear;

[0026] The three pen clamping wheels surround a pen passing space, and the caliber of the pen passing space is smaller than the middle through hole.

[0027] The further preferred technical scheme of the utility model is as follows: the base comprises a bottom disc and a shell, the bottom disc and the shell are fixedly connected through a buckle structure to form a cavity, the driving tooth, the three worm gears, the fixed frames and the three-wheel pen feeding device are all installed in the cavity;

[0028] The buckle structure comprises a clamping hook at the bottom of the peripheral side wall of the shell and a clamping groove at the corresponding position of the bottom disc, and the clamping hook is matched with the clamping groove.

[0029] The further preferred technical scheme of the utility model is as follows: the shell comprises a peripheral side wall and a top wall, and the bottom disc and the top wall are installed with three fixed frames therebetween;

[0030] The outer surfaces of the upper cross beam and the lower cross beam of the fixed frame are both provided with protrusions, correspondingly, the inner surfaces of the top wall and the bottom disc are both provided with grooves corresponding to the protrusions, and the protrusions are matched with the grooves.

[0031] The further preferred technical scheme of the utility model is as follows: the fixed frame comprises a base, an upper cross beam and a lower cross beam, and a pair of first circular notches for clamping the end portions of the worm gears are arranged on the upper cross beam and the lower cross beam respectively;

[0032] A pair of second circular notches for clamping the end portions of the transmission shafts are further arranged on the base; the two first circular notches are vertically distributed, and the two second circular notches are horizontally distributed;

[0033] The outer sides of the first circular notches and the second circular notches are both open;

[0034] The upper end surface of the upper cross beam is provided with a first clamping part, the first clamping part is clamped into the top wall,

[0035] The lower end surface of the lower cross beam is provided with a second clamping part, and the second clamping part is clamped into the bottom disc.

[0036] The further preferred technical scheme of the utility model is as follows: the driving tooth comprises a tooth part provided with peripheral teeth and a lower extension part, the peripheral teeth are located on the inner side of the bottom disc, the lower edge of the lower extension part is provided with a hook part, and the lower extension part is hooked after passing through the through hole of the bottom disc.

[0037] Compared with the prior art, the pencil sharpener has the advantages that the three-wheel pencil feeding device is designed, three-point clamping of the pencil is realized, the pencil is uniformly stressed in the high-speed cutting process, force balance is obtained, and the stability of the pencil sharpening is improved.

[0038] The technical means that each worm gear meshes with the peripheral teeth of the poking tooth provides a pencil feeding mechanism of the pencil sharpener, which can reliably and stably rotate the gear, reduces the slippage phenomenon caused by friction transmission, improves the transmission efficiency, avoids the jamming problem in the pencil sharpening process, and ensures the continuity and smoothness of the pencil sharpening process.

[0039] Meanwhile, the end portions of the worm and the transmission shaft are fixed by the fixing frame, the assembly process is simplified, the assembly efficiency is improved, and the fault risk caused by improper assembly is reduced. Moreover, in the technical scheme, the bottom plate and the shell are connected to form a cavity, and all key components are installed in the inner cavity surrounded by the bottom plate and the shell. The compact layout not only saves space, but also facilitates maintenance and repair. BRIEF DESCRIPTION OF DRAWINGS

[0040] The utility model will be described in further detail below in combination 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 utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described objects and can include exaggerated display, and the drawings are not necessarily drawn to scale.

[0041] Figure 1 It is the overall structure schematic diagram of three-wheel pencil feeding mechanism;

[0042] Figure 2 It is the internal structure schematic diagram of three-wheel pencil feeding mechanism Figure One ;

[0043] Figure 3 It is the internal structure schematic diagram of three-wheel pencil feeding mechanism Figure Two ;

[0044] Figure 4 It is the internal structure schematic diagram of three-wheel pencil feeding mechanism Figure Three ;

[0045] Figure 5 It is the internal structure schematic diagram of three-wheel pencil feeding mechanism Figure One ;

[0046] Figure 6 It is the internal structure schematic diagram of three-wheel pencil feeding mechanism Figure Two ;

[0047] Figure 7Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure One ;

[0048] Figure 8 Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure Two ;

[0049] Figure 9 Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure One ;

[0050] Figure 10 Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure Two ;

[0051] Figure 11 Schematic diagram of a pen holder assembly, a worm and a fixing frame

[0052] Figure 12 Schematic diagram of a pen holder assembly, a worm and a fixing frame

[0053] Figure 13 Schematic diagram of a pen holder assembly, a worm and a fixing frame

[0054] Figure 14 Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure One ;

[0055] Figure 15 Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure Two ;

[0056] Figure 16 Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure One ;

[0057] Figure 17 Schematic diagram of a pen holder assembly, a worm and a fixing frame Figure Two . DETAILED DESCRIPTION

[0058] Preferred embodiments of the present application will be described in detail below with reference to the attached drawings. It will be appreciated that the description is merely descriptive and exemplary and should not be construed as limiting the scope of the present application.

[0059] It should be noted that like numbers refer to like elements throughout the several views of the drawings and as such, once an element is defined in one drawing that is common to several drawings, further description and explanation of the same element is omitted from the other drawings.

[0060] As Figures 1 to 4As shown, the three-wheel pencil feeding mechanism 100 of the pencil sharpener includes a chassis 10, a housing 20 with a pencil insertion hole 21, a toggle tooth 30, three worm gears 40, and a three-wheel pencil feeding device 50. The chassis 10 and the housing 20 are connected to form a cavity h. It should be noted that the combination of the chassis 10 and the housing 20 provides the "base function" to support the entire mechanism, and the above-mentioned components are installed in the inner cavity h formed by the two.

[0061] The combination of the chassis 10 and the housing 20 provides a solid base, ensuring the stability of the pencil feeding mechanism 100 during operation. Thus, the mechanism deviation caused by mechanical vibration or external force is reduced, thereby ensuring the accuracy and reliability of the pencil sharpening process.

[0062] The inner cavity h formed by the chassis 10 and the housing 20 provides a centralized installation space for all key components. This compact layout not only saves space, but also facilitates maintenance and repair. In addition, the inner cavity h also provides physical protection for the internal components of the pencil feeding mechanism 100, preventing the intrusion of dust, debris or other foreign objects, thereby prolonging the service life of the mechanism and reducing the failure rate.

[0063] Among them, the toggle tooth 30 can be assembled in the middle of the chassis 10, and the toggle tooth 30 includes a middle through hole 31 connected with the knife holder and a peripheral tooth 32. The toggle tooth 30 is a key component in the three-wheel pencil feeding mechanism 100 of the pencil sharpener, which is assembled in the middle of the chassis 10 and serves as the core function of feeding the pencil into the pencil sharpener for sharpening. The design of the toggle tooth 30 includes a middle through hole 31, which is used to connect with the knife holder to ensure that the pencil can be stably positioned and guided to the sharpening position during the sharpening process. In addition, the toggle tooth 30 is also provided with peripheral teeth 32, which are engaged with the gear wheels 41 of the three worm gears 40, thereby realizing precise feeding movement.

[0064] The peripheral teeth 32 of the toggle tooth 30 not only engage with the gear wheels 41 of the worm gears 40, but also their design and arrangement are crucial to the motion transmission efficiency and stability of the entire pencil feeding mechanism. The tooth shape and pitch of the peripheral teeth 32 need to be accurately calculated to ensure perfect engagement with the gear wheels 41 of the worm gears 40, avoiding any jamming or sliding during the sharpening process, thereby ensuring the smoothness of the sharpening process and the consistency of the pencil sharpening.

[0065] In addition, in the three-wheel pencil feeding mechanism 100 of the pencil sharpener, the design and distribution of the three worm gears 40 are the key to realizing precise pencil feeding. These worm gears 40 are cleverly distributed around the peripheral teeth 32 of the toggle tooth 30, ensuring the compactness and symmetry of the mechanism. The lower end of each worm gear 40 is precisely provided with a worm gear 41, which is engaged with the peripheral teeth 32 of the toggle tooth 30, thereby transmitting the rotary motion to the pencil clamping assembly to realize automatic or semi-automatic feeding of the pencil.

[0066] As shown in Figure 5 and Figure 6 , the engagement of the worm gear 41 with the peripheral teeth 32 not only provides a stable transmission, but also ensures the smoothness and consistency of the pencil feeding process. The worm gear 41 takes into account the transmission efficiency and load capacity to meet the performance requirements of the pencil sharpener during long-term operation. In addition, the geometric parameters of the worm 40, such as the module, tooth angle, number of heads, and lead angle of the indexing cylinder, are carefully calculated and optimized to meet specific transmission ratios and motion characteristics.

[0067] Preferably, the distribution and design of the worm 40 also take into account space efficiency and maintenance convenience. Their layout allows the entire mechanism to be compactly installed inside the pencil sharpener, while leaving enough space for maintenance and possible upgrades.

[0068] Further, as shown in Figure 7 , Figure 8 and Figure 12 , the three-wheel pencil feeding device 50 is based on the coordinated work of the three pencil clamping assemblies 51 to achieve stable pencil feeding. The three-wheel pencil feeding device 50 includes three pencil clamping assemblies 51, each of which includes a transmission shaft 511, which allows more efficient and direct power transmission between the pencil clamping wheel 52 and the worm 40.

[0069] The transmission shaft 511 is provided with helical teeth 512 at one end, which engage with the gear 41 of the worm 40, providing an efficient and stable transmission method. The helical teeth 512 not only improve transmission efficiency, but also help reduce friction and wear between gears, thereby prolonging the service life of the entire mechanism. In addition, the helical teeth 512 also allow the pencil clamping assembly 51 to be more stable during transmission, reducing the vibration of the pencil during feeding and ensuring the smoothness of the pencil sharpening process and the consistency of the pencil sharpening.

[0070] The other end of the transmission shaft 511 is connected to the pencil clamping wheel 52, which together encloses a pencil passing space 53. The caliber of the pencil passing space 53 is designed to be smaller than the middle through hole 31 of the actuating tooth 30, which ensures that the pencil can be accurately positioned and clamped when fed into the pencil sharpener. The structure of the pencil passing space 53 not only provides enough space to accommodate pencils of different diameters, but also limits the swing of the pencil during feeding by its precise caliber, further improving the accuracy and stability of the pencil sharpening.

[0071] In addition, the pencil clamping wheel 52 also takes into account the gentle clamping of the pencil. The pencil clamping wheel 52 is preferably made of soft material, such as rubber or plastic, to provide good friction and protect the pencil from damage, so as to avoid applying excessive pressure to the pencil during pencil sharpening, which may cause the pencil to break or be damaged.

[0072] Further, the housing 20 comprises a peripheral sidewall 21 and a top wall 22, which together form a solid frame to ensure the stability and durability of the entire mechanism. Three fixing brackets 60 are installed between the base 10 and the top wall 22, and are used to fix the ends of the worm 40 and the ends of the transmission shaft 511.

[0073] The fixing bracket 60 comprises a base 61, an upper crossbeam 62 and a lower crossbeam 63, which are arranged at the upper and lower ends of the base 61, respectively, to provide additional support and stability. The upper crossbeam 62 and the lower crossbeam 63 are respectively provided with a pair of first circular notches h1 for the ends of the worm 40 to be inserted into. These notches allow the ends of the worm 40 to be smoothly inserted, while providing sufficient space to ensure that the gears 41 of the worm 40 can be smoothly engaged with the peripheral teeth 32 of the actuating teeth 30. Moreover, when the worm 40 or the transmission shaft 511 needs to be maintained or replaced, it can be easily removed from the fixing bracket 60.

[0074] In addition, the base 61 is also provided with a pair of second circular notches h2 for the ends of the transmission shaft 511 to be inserted into; the two first circular notches h1 are vertically distributed, and the two second circular notches h2 are horizontally distributed. These notches are used to insert the ends of the transmission shaft 511 to ensure the stable fixation of the transmission shaft. Moreover, the horizontal distribution of the second circular notches h2 in combination with the vertical distribution of the first circular notches h1 forms a stable grid-like fixing system, which effectively limits and supports the worm 40 and the transmission shaft 511 in their respective axial directions.

[0075] Preferably, the outer sides of the first circular notches h1 and the second circular notches h2 are open. The open notches allow the ends of the worm 40 and the transmission shaft 511 to be easily inserted and removed, greatly simplifying the installation and maintenance process. In addition, the open notch design reduces the risk of component damage caused by improper or excessive fixation, thereby reducing the failure rate of the mechanism.

[0076] Further, as shown in FIG. 1, the base 10 is provided with a pair of protrusions 71, which are arranged at the two ends of the base 10 and are used to fix the ends of the transmission shaft 511. The protrusions 71 are arranged in a vertical direction, and the transmission shaft 511 is arranged in a horizontal direction, so that the protrusions 71 and the transmission shaft 511 form a stable grid-like fixing system. Figure 16As shown, the upper end surface of the upper cross beam 62 is provided with a first clamping part k1 clamped into the top wall 22, and the lower end surface of the lower cross beam 63 is provided with a second clamping part k2 clamped into the bottom plate 10. Preferably, the clamping part in the utility model is a protrusion, specifically, the outer surfaces of the upper and lower cross beams of the fixing frame 60 are provided with protrusions, and the inner surfaces of the top wall 22 and the bottom plate 10 are provided with grooves corresponding to the protrusions, and the protrusions cooperate with the grooves. By arranging protrusions on the outer surfaces of the upper cross beam 62 and the lower cross beam 63 of the fixing frame 60, and arranging grooves corresponding to the protrusions between the inner surfaces of the top wall 22 and the bottom plate 10, the cooperation of the protrusions and the grooves greatly enhances the stability of the fixing frame 60. This structure can effectively resist displacement and deformation caused by external force, ensuring the accurate positioning and stability of the entire pen feeding mechanism during operation.

[0077] Moreover, the cooperation of the protrusions and the grooves simplifies the assembly process. Since the protrusions can be directly clamped into the corresponding grooves, this design reduces the alignment time during assembly, improves assembly efficiency, and also reduces the risk of failure caused by improper assembly.

[0078] Further, in the fixing frame 60, the cooperation of the protrusions and the grooves can also help to more evenly distribute the stress generated by the load. This technical means can reduce the damage of components caused by local stress concentration, thereby improving the durability and reliability of the entire mechanism.

[0079] In addition, the toggle tooth 30 is a key component in the pen feeding mechanism 100 of the pencil sharpener, and its design and function are crucial to the entire sharpening process. The toggle tooth 30 is composed of a tooth part 321 and a lower extension part 322, wherein the tooth part 321 is provided with peripheral teeth 32, which are engaged with the gear wheels 41 of the three worms 40, responsible for transmitting power to the pencil clamping assembly 51, thereby driving the feeding and feeding out of the pencil.

[0080] The peripheral teeth 32 are located on the inner side of the bottom plate 10, and this layout enables the toggle tooth 30 to closely engage with the worm gear 41, ensuring the efficiency and stability of power transmission. The design of the lower extension part 322 cleverly expands the function of the toggle tooth 30, enabling it not only to transmit power, but also to be firmly fixed on the bottom plate 10.

[0081] The lower edge of the lower extension part 322 is provided with a hook part 323, so that the toggle tooth 30 can be easily installed on the bottom plate 10. Specifically, the lower extension part 322 passes through the through hole 31 of the bottom plate 10, and then uses the hook part 323 to hook the other side of the bottom plate 10, thereby achieving quick installation and fixation of the toggle tooth 30.

[0082] In summary, the toggle tooth 30 combines functionality and practicality. Power is transmitted through the meshing of its tooth portion 321 with the peripheral teeth 32, while the lower extension portion 322 and the hook portion 323 ensure a secure mounting on the chassis 10. This technical solution not only improves the efficiency of the pencil sharpener, but also enhances its stability and reliability in long-term use.

[0083] Preferably, if Figure 13 As shown, the housing 20 and the chassis 10 are fixedly connected via a snap-fit ​​structure. The snap-fit ​​structure includes a hook n1 at the bottom of the side wall 21 of the housing 20 and a slot n2 at a corresponding position on the chassis 10. The hook n1 cooperates with the slot n2 to securely connect the housing 20 to the chassis 10.

[0084] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "back," "left," "right," "inner," and "outer" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used solely to facilitate understanding and have no other directional meanings, and should not be construed as limitations on this utility model.

[0085] The three-wheeled pen feed mechanism of the pencil sharpener provided by the present invention has been introduced. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are merely intended to facilitate understanding of the present invention and its core concept. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. The three-wheel pen feeding mechanism of the pencil sharpener is characterized by: It includes a chassis, a housing with a pen insertion hole, a toggle gear, three worms and a three-wheel pen feeding device; The chassis and the housing are connected to form a cavity; The toggle gear can be assembled in the middle of the chassis, and the toggle gear includes a middle through hole connected to the tool holder and peripheral teeth; Three worms are distributed on the periphery of the peripheral teeth, and a worm gear is provided at the lower end of each worm; each worm gear is simultaneously engaged with the peripheral teeth of the shifting teeth; The three-wheel pen feeding device includes three pen clamping assemblies, each pen clamping assembly includes a transmission shaft, one end of the transmission shaft is provided with helical teeth that cooperate with the worm, and the other end of the transmission shaft is provided with a pen clamping wheel; the three pen clamping wheels surround a pen passing space, and the diameter of the pen passing space is smaller than the middle through hole.

2. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 1, characterized in that: The housing comprises a peripheral side wall and a top wall. Three fixing frames are installed between the base plate and the top wall. The fixing frames are used to fix the end of the worm and the end of the transmission shaft.

3. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 2, characterized in that: The fixing frame includes a base, an upper crossbeam and a lower crossbeam, and the upper crossbeam and the lower crossbeam are respectively provided with a pair of first circular notches for the end of the worm to be clamped into; The base is also provided with a pair of second circular notches for the end of the transmission shaft to be clamped into; the two first circular notches are distributed vertically, and the two second circular notches are distributed horizontally; The outer sides of the first circular notch and the second circular notch are both open.

4. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 3, characterized in that: The upper end surface of the upper crossbeam is provided with a first clamping portion, which is clamped into the top wall. The lower end surface of the lower cross beam is provided with a second clamping portion, and the second clamping portion is clamped into the chassis.

5. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 1, characterized in that: The toggle tooth includes a tooth portion with peripheral teeth and a lower extension portion, the peripheral teeth are located on the inner side of the chassis, the lower edge of the lower extension portion is provided with a hook portion, and the lower extension portion is hooked by the hook portion after passing through the through hole of the chassis.

6. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 1, characterized in that: A snap-fit ​​structure is provided between the housing and the chassis; The buckle structure includes a hook at the bottom of the peripheral side wall of the shell and a slot at a corresponding position of the chassis, and the hook cooperates with the slot.

7. The three-wheel pen feeding mechanism of the pencil sharpener is characterized by: It includes a base, a toggle gear mounted on the base, three worms, a fixing frame and a three-wheel pen feeding device; The toggle tooth is located in the middle of the base, and the toggle tooth includes a middle through hole connected to the tool holder and peripheral teeth; Three worms are distributed on the periphery of the peripheral teeth, each worm is mounted on a corresponding fixed frame, and a worm gear meshing with the peripheral teeth is provided at the lower end of the worm; The three-wheel pen feeding device includes three pen clamping assemblies, each of which includes a transmission shaft, one end of which is provided with helical teeth, and the other end of which is provided with a pen clamping wheel; each pen clamping assembly is mounted on a corresponding fixing frame, and the helical teeth are engaged with a corresponding worm gear; The three pen-clamping wheels form a pen-passing space, and the diameter of the pen-passing space is smaller than the middle through hole.

8. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 7, characterized in that: The base includes a chassis and a shell, and the chassis and the shell are fixedly connected by a snap structure to form a cavity; the toggle gear, three worms, fixing frame and three-wheel pen feeding device are all installed in the cavity; The buckle structure includes a hook at the bottom of the peripheral side wall of the shell and a slot at a corresponding position of the chassis, and the hook cooperates with the slot.

9. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 8, characterized in that: The housing includes a peripheral side wall and a top wall, and three fixing brackets are installed between the bottom plate and the top wall; The outer surfaces of the upper and lower beams of the fixing frame are both provided with protrusions. Correspondingly, grooves corresponding to the protrusions are provided between the inner surface of the top wall and the inner surface of the chassis, and the protrusions cooperate with the grooves.

10. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 7, characterized in that: The fixing frame includes a base, an upper crossbeam and a lower crossbeam, and the upper crossbeam and the lower crossbeam are respectively provided with a pair of first circular notches for the end of the worm to be clamped into; The base is also provided with a pair of second circular notches for the end of the transmission shaft to be clamped into; the two first circular notches are distributed vertically, and the two second circular notches are distributed horizontally; The outer sides of the first circular notch and the second circular notch are both open; The upper end surface of the upper crossbeam is provided with a first clamping portion, which is clamped into the top wall. The lower end surface of the lower cross beam is provided with a second clamping portion, and the second clamping portion is clamped into the chassis.

11. The three-wheel pen feeding mechanism of the pencil sharpener according to claim 7, characterized in that: The toggle tooth includes a tooth portion with peripheral teeth and a lower extension portion, the peripheral teeth are located on the inner side of the chassis, the lower edge of the lower extension portion is provided with a hook portion, and the lower extension portion is hooked by the hook portion after passing through the through hole of the chassis.

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