Optimized structure of pencil sharpener assembly and pencil sharpener

Abstract

The utility model discloses a pencil sharpener assembly optimization structure and pencil sharpener, including main casing, enter pen device, dust baffle, cutting device and dust collecting box, the main casing front side has the pen hole, and the back side has the first assembly hole for installing cutting device, dust baffle is fixed in the main casing through the plug -in part, and the inner chamber is divided into the front and rear cavity, enter pen device installation in the front cavity, contains the fixed frame, the rotating disc and the pencil clamping wheel group, is used for clamping pencil. Cutting device installation is in the rear cavity, is by hobbing cutter group, gear ring seat and shake handle and is composed, is positioned through gear ring seat support, and shake handle drives hobbing cutter group rotation and completes cutting, and dust collecting box is connected with the inner interface of main casing lower extreme through the external interface and is clamped, and collects the chippings, this structure adopts the connecting mode of plug -in, buckle and other tool -less, realizes the quick assembly, improves production efficiency, strengthens the structural stability and use security.

Description

Technical Field

[0001] This utility model relates to a hand-cranked pencil sharpener, and more particularly to an optimized assembly structure for the pencil sharpener; it requires no tools, is easy to assemble, and improves production efficiency. Background Technology

[0002] A pencil sharpener is a common stationery item. Its basic structure typically includes main components such as a housing, a pencil feed mechanism, a cutting roller assembly, a crank handle, and a shavings collection box. The housing serves as the outer shell of the entire pencil sharpener, protecting the internal components and integrating their functions. The pencil feed mechanism guides the pencil into the sharpener, the cutting roller assembly cuts the pencil, the crank handle provides power, and the shavings collection box collects the pencil shavings generated during the sharpening process.

[0003] In the prior art, the housing of a pencil sharpener typically consists of a front housing and a rear housing, which are fixedly connected by fasteners (such as screws). For example, in the prior art with patent number CN209775976U, an automatic pencil sharpener with easy assembly is disclosed. Its housing includes a front housing and a rear housing, and an automatic pencil feeding mechanism is mounted on a fixed plate located between the front housing and the rear housing. The assembly is completed by screws passing through the front housing, the fixed plate, and then being fixed to the rear housing in sequence.

[0004] However, this method of assembling the casing using screws has several drawbacks. First, screw assembly requires tools such as screwdrivers, and each screw must be tightened individually, making the process cumbersome and increasing the complexity of assembly. Second, the tightening force of the screws needs to be moderate; too loose, and the components will not connect securely, affecting the stability and lifespan of the pencil sharpener; too tight, and it may damage the screws or threaded holes, or even cause the casing to deform, increasing production costs. Furthermore, screws may loosen or even fall off during use due to vibration, not only affecting the normal operation of the pencil sharpener but also posing a safety hazard, especially for children, who may accidentally swallow loose screws. These factors all contribute to the low assembly efficiency of the pencil sharpener, making it difficult to meet the needs of large-scale production, and also affecting the user experience.

[0005] Therefore, how to simplify the assembly process of pencil sharpeners, improve assembly efficiency, and at the same time ensure product stability and safety is an urgent problem to be solved in the current field of pencil sharpener technology. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an optimized assembly structure for a pencil sharpener. By optimizing the assembly structure of the pencil sharpener and adopting tool-free connection methods such as plug-in and snap-fit, the main housing, pencil feeding device, dust baffle, cutting device and dust collection box can be quickly assembled, thereby improving production efficiency, enhancing structural stability and safety of use.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is: an optimized assembly structure for a pencil sharpener, including a main housing, a pencil feeding device, a dust baffle, a cutting device, and a dust collection box;

[0008] The main housing has a pen inlet hole on the front side and a first assembly hole on the rear side for mounting a cutting device; the dust baffle includes a plate body and a second assembly hole located at the center of the plate body, the plate body has insertion parts on both sides, and the main housing has an insertion groove; the insertion parts of the plate body are inserted into the insertion groove and fixed, dividing the inner cavity of the main housing into a front cavity and a rear cavity;

[0009] The pen feeding device includes a fixed frame, a rotating disk with an interface, and a pen clamping wheel assembly; the fixed frame is mounted on the dust baffle; the pen clamping wheel assembly corresponds to the pen feeding hole and is used to clamp the pencil; the entire pen feeding device is installed in the front cavity.

[0010] The cutting device includes a hob assembly, a gear ring seat, and a crank handle. The gear ring seat is installed on the first mounting hole. The hob assembly is located in the rear cavity and is supported and positioned by the gear ring seat. The crank handle is located outside the main housing and is used to drive the hob assembly to rotate. The front end of the hob assembly is connected to the interface of the rotating disk to realize the cutting action of the pencil.

[0011] The lower end of the main housing has an inner interface, and the upper end of the dust collection box has an outer interface. The outer wall of the inner interface has a rib, and the inner wall of the outer interface has a groove that matches the rib. The outer interface of the dust collection box is fitted over the inner interface of the main housing, and the rib is inserted into the groove, thereby achieving a stable connection between the dust collection box and the main housing, which facilitates the collection of cutting debris.

[0012] A further preferred embodiment of this utility model is: the main housing includes a top wall, a front wall, a left wall, a right wall, and a rear wall;

[0013] The pen inlet hole is located on the front wall, and the first assembly hole is located on the rear wall;

[0014] The insertion slots are respectively provided on the inner surfaces of the left wall and the rear wall.

[0015] A further preferred embodiment of this utility model is: a transverse rib is provided on the front wall and the rear wall of the inner interface respectively;

[0016] The front and rear walls of the external interface are each provided with a transverse groove;

[0017] The wall thickness of the inner interface is less than the wall thickness of the main housing; the wall thickness of the outer interface is less than the wall thickness of the dust collection box; the sum of the wall thicknesses of the inner interface and the outer interface is the wall thickness of the main housing.

[0018] A further preferred embodiment of this utility model is: the thickness of the insertion part is greater than the thickness of the plate body, and a locking protrusion is provided on the outer side of the insertion part;

[0019] The left and right walls are respectively provided with recesses that match the card slot protrusions.

[0020] A further preferred embodiment of this utility model is: the second assembly hole is a circular hole provided on the plate, and an assembly area is provided on each side of the circular hole;

[0021] The assembly area includes notches distributed along an arc, an anti-backward structure, and a positioning part;

[0022] The fixing frame is provided with two fixing ears and an arc-shaped limiting part, and the arc-shaped limiting part is inserted into the circular hole;

[0023] The fixed ear moves along the notch and the anti-backward structure and then enters the positioning part.

[0024] A further preferred embodiment of this utility model is that the anti-backward structure is an inclined surface that allows the fixing ear to deform, and the positioning part is lower than the high position of the inclined surface.

[0025] A further preferred embodiment of this utility model is: two straight ribs spaced a distance apart are provided on both the left and right walls, forming the insertion groove.

[0026] A further preferred embodiment of this utility model is as follows: two protrusions are provided on the outer periphery of the gear ring seat, and two corresponding notches are provided on the first assembly hole of the main housing;

[0027] The inner edge of the first assembly hole of the main housing is provided with an inclined surface for locking the gear ring seat; and a limiting part is provided to restrict the continued rotation of the gear ring seat.

[0028] A further preferred embodiment of this utility model is as follows: the hobbing cutter assembly includes a cutter holder and a hobbing cutter, the hobbing cutter shaft being connected to the cutter holder; the front end of the cutter holder is inserted into the interface of the rotating disk;

[0029] The rear end of the cutter holder is connected to the crank handle, and the end of the hob is provided with a gear that meshes with the internal gear ring on the gear ring seat.

[0030] Another technical subject: a pencil sharpener, characterized by including the optimized assembly structure of the pencil sharpener.

[0031] Compared with existing technologies, the advantages of this invention are as follows: Traditional pencil sharpener assembly often requires the use of screws and other fasteners, making the assembly process cumbersome and time-consuming. Tools are also needed to tighten the screws, requiring a high level of skill from the assemblers. In this technical solution, the main housing and dust baffle are fixed together through the cooperation of a plug-in part and a plug-in groove. The pencil feeding device is mounted on the dust baffle, and the cutting device is mounted on the first assembly hole of the main housing via a gear ring seat. The dust collection box and the main housing are securely connected through the snap-fit ​​of protruding ribs and grooves. These techniques eliminate the need for tools; assembly can be completed with simple plugging and snap-fit ​​actions, greatly simplifying the assembly process, reducing assembly difficulty, and making the assembly process more efficient and faster. This effectively improves production efficiency, reduces production costs, and is especially suitable for large-scale production.

[0032] This optimized assembly structure significantly enhances the overall structural stability of the pencil sharpener. The main housing divides the internal cavity into a front cavity and a rear cavity, with the pencil feeding device and cutting device installed in separate cavities. This separation ensures that the components do not interfere with each other during operation, reducing vibration and loosening caused by interactions between components and guaranteeing the stability of the pencil sharpener during use. The plug-in fixing method of the dust baffle and the snap-fit ​​connection between the dust collection box and the main housing further strengthen the connections between components, effectively preventing loosening or detachment of components due to external forces or long-term use. Furthermore, the hobbing cutter assembly is supported and positioned by a gear ring seat, ensuring the stability of the cutting device during operation, thereby improving cutting accuracy and pencil sharpening quality, and extending the service life of the pencil sharpener.

[0033] This technical solution also achieves significant results in terms of user safety. The secure connection between the dust collection box and the main housing effectively collects debris generated during the cutting process, preventing debris from scattering and avoiding potential harm to users, especially children, by reducing the risk of accidental ingestion of debris. Furthermore, since no screws or other fasteners are used during assembly, there is no issue of loose or detached screws, further enhancing the safety of the pencil sharpener and providing users with a safer and more reliable experience. Attached Figure Description

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0035] Figure 1 This is a schematic diagram of the overall structure of the pencil sharpener in this embodiment;

[0036] Figure 2 This is a schematic diagram of the internal structure of the pencil sharpener in this embodiment;

[0037] Figure 3 This is a side cross-sectional view of the pencil sharpener in this embodiment;

[0038] Figure 4 This is a structural disassembly diagram of the pencil sharpener in this embodiment;

[0039] Figure 5 This is a structural disassembly diagram of the pencil sharpener in this embodiment;

[0040] Figure 6 This is a schematic diagram of the dust baffle and the main housing in this embodiment. Figure 1 ;

[0041] Figure 7 This is a schematic diagram of the dust baffle and the main housing in this embodiment. Figure 2 ;

[0042] Figure 8 This is a schematic diagram of the pen feeding device in this embodiment. Figure 1 ;

[0043] Figure 9 This is a schematic diagram of the pen feeding device in this embodiment. Figure 2 ;

[0044] Figure 10 This is a diagram illustrating the assembly of the pen feed mechanism and dust baffle. Figure 1 ;

[0045] Figure 11 This is a diagram illustrating the assembly of the pen feed mechanism and dust baffle. Figure 2 ;

[0046] Figure 12 This is a schematic diagram of the overall structure of the cutting device in this embodiment. Figure 1 ;

[0047] Figure 13 This is a schematic diagram of the overall structure of the cutting device in this embodiment. Figure 2 ;

[0048] Figure 14 This is a schematic diagram of the assembly of the gear ring seat and the rear wall in this embodiment. Figure 1 ;

[0049] Figure 15 This is a schematic diagram of the assembly of the gear ring seat and the rear wall in this embodiment. Figure 2 . Detailed Implementation

[0050] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0051] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0052] like Figures 1 to 5 As shown, this embodiment relates to a pencil sharpener 101, the core innovation of which lies in an optimized assembly structure 100 for the pencil sharpener. This optimized structure significantly improves the overall performance and user experience of the pencil sharpener through structural improvements. Specifically, the optimized assembly structure 100 includes a main housing 10, a pencil feeding device 20, a dust baffle 30, a cutting device 50, and a dust collection box 40.

[0053] The main housing 10 serves as the basic framework of the entire pencil sharpener, providing necessary structural support and facilitating connections with other components. It features a pencil inlet 11 on its front for inserting pencils and a first mounting hole 12 on its rear for mounting the cutting device 50. Furthermore, the main housing 10 includes an insertion slot 13 for securing a dust baffle 30, thus dividing the inner cavity into a front cavity h1 and a rear cavity h2. This arrangement optimizes the utilization of internal space and enhances the overall stability of the pencil sharpener.

[0054] The pencil feeding device 20 is responsible for guiding the pencil smoothly into the pencil sharpener and clamping it. The pencil feeding device 20 includes a fixed frame 21, a rotating disk 22 with an interface 221, and a pencil clamping wheel assembly 23. The fixed frame 21 is mounted on the dust baffle 30, and the pencil clamping wheel assembly 23 corresponds to the pencil feeding hole 11, accurately clamping the pencil and ensuring its stability during the sharpening process. The entire pencil feeding device 20 is installed inside the front cavity h1 and, through its interface 221 with the rotating disk 22, achieves the transfer and positioning of the pencil.

[0055] The dust baffle 30 is designed to prevent debris generated during the cutting process from entering the internal structure of the main housing 10, thereby extending the lifespan of the pencil sharpener and keeping the interior clean. The dust baffle 30 includes a plate body 31 and a second mounting hole 32 located at the center of the plate body 31. Insertion portions 33 are provided on both sides of the plate body 31. These insertion portions 33 are inserted into insertion slots 13 within the main housing 10 and are securely fixed through the engagement of a locking protrusion v1 and a recess v2. The dust baffle 30 not only serves as an isolation device but also, through its unique structural design, further optimizes the internal spatial layout of the main housing 10. This will be explained in detail below.

[0056] The cutting device 50 is a crucial component of the pencil sharpener, responsible for cutting the pencil. It includes a roller cutter assembly 51, a gear ring holder 52, and a crank handle 53. The gear ring holder 52 is mounted on the first mounting hole 12 of the main housing 10. The roller cutter assembly 51 is located within the rear cavity h2 and is supported and positioned by the gear ring holder 52. The crank handle 53 is located outside the main housing 10. The user drives the roller cutter assembly 51 to rotate by cranking the handle, thereby completing the pencil cutting action. The front end of the roller cutter assembly 51 precisely mates with the interface 221 of the rotating disk 22, ensuring the efficiency and stability of the cutting process.

[0057] The dust collection box 40 fully considers the problem of collecting debris generated during the use of the pencil sharpener. An inner interface 14 is located at the lower end of the main housing 10, and an outer interface 41 is located at the upper end of the dust collection box 40. The outer wall of the inner interface 14 has a raised rib 141, and the inner wall of the outer interface 41 has a groove 411 that matches the raised rib 141. By fitting the outer interface 41 of the dust collection box 40 over the inner interface 14 of the main housing 10 and engaging the raised rib 141 into the groove 411, a secure connection between the dust collection box 40 and the main housing 10 is achieved. This technique not only facilitates user disassembly and cleaning of the dust collection box but also effectively prevents debris leakage, maintaining a clean operating environment.

[0058] Furthermore, the dust baffle 30 is a significant innovation of this technical solution. The dust baffle 30 is mainly composed of a plate body 31, with a second mounting hole 32 at its center for docking with other components. To achieve a secure connection between the dust baffle 30 and the main housing 10, insertion portions 33 are provided on both sides of the plate body 31. Simultaneously, corresponding insertion grooves 13 are provided inside the main housing 10, and the shape and size of these grooves 13 match those of the insertion portions 33.

[0059] During assembly, the insertion part 33 of the dust baffle 30 is inserted into the insertion slot 13 of the main housing 10, and then securely connected using an appropriate fixing method (such as snap-fit ​​or tight fit). This technique not only achieves a tight connection between the dust baffle 30 and the main housing 10, but also cleverly divides the inner cavity of the main housing 10 into two independent spaces: the front cavity h1 and the rear cavity h2. The front cavity h1 is mainly used to install the pencil feeding device 20, ensuring that the pencil can smoothly enter and be clamped; while the rear cavity h2 provides installation space for the cutting device 50, enabling it to efficiently complete the pencil cutting operation.

[0060] Through this unique partitioning design, the dust baffle 30 not only effectively prevents debris generated during the cutting process from entering other parts of the main housing 10, thereby extending the service life of the pencil sharpener and keeping the interior clean, but also optimizes the utilization efficiency of the internal space, enabling each component to operate efficiently in its own independent space, further improving the overall performance and stability of the pencil sharpener.

[0061] The pencil feeding device 20 is a key component in the pencil sharpener responsible for guiding and holding the pencil. For example... Figure 8 and Figure 9 As shown, the device mainly consists of a fixed frame 21, a rotating disk 22 with an interface 221, and a pen-clamping wheel assembly 23. The fixed frame 21 serves as the basic structure of the pen feeding device, supporting and fixing other components. It is firmly fixed to the dust baffle 30 through a precise installation method, ensuring the stability of the entire pen feeding device.

[0062] The pen-clamping wheel assembly 23 is located at the front end of the pen feeding device, and its position precisely corresponds to the pen feeding hole 11 on the front side of the main housing 10. When the pencil is inserted through the pen feeding hole 11, the pen-clamping wheel assembly 23 can automatically clamp the pencil, ensuring that the pencil remains stable during the cutting process and does not wobble or deviate, thereby ensuring the accuracy and consistency of the cutting.

[0063] Preferably, the pencil clamping wheel assembly 23 fully considers the compatibility of pencils of different diameters, can adapt to pencils of various specifications, and improves the versatility of the pencil sharpener.

[0064] The rotating disk 22 is located in the middle of the pencil feeding device and has an interface 221 for docking with the hobbing cutter assembly 51 of the cutting device 50. When the user cranks the handle 53, power is transmitted to the hobbing cutter assembly 51 through the gear ring seat 52. The front end of the hobbing cutter assembly 51 is inserted into the interface 221 of the rotating disk 22, thereby driving the pencil to rotate and advance forward, completing the cutting action. The rotating disk 22 ensures efficient power transmission.

[0065] The entire pencil feeding device 20 is installed in the front cavity h1 of the main housing 10. This arrangement makes the pencil feeding device and the cutting device 50 spatially independent, avoiding mutual interference between the two, and also facilitating maintenance and replacement of parts. Through the secure connection between the fixing bracket 21 and the dust baffle 30, the pencil feeding device 20 remains stable in the front cavity h1, providing a reliable guarantee for the smooth entry and cutting of the pencil.

[0066] Specifically, the cutting device 50 is the core component of the pencil sharpener, responsible for completing the pencil cutting operation. This device mainly consists of a hobbing cutter assembly 51, a gear ring seat 52, and a crank handle 53. The components work together to ensure the efficiency and stability of the cutting process.

[0067] The hobbing cutter assembly 51 is a key component of the cutting device, responsible for directly cutting the pencil. It includes a tool holder 511 and a hob 512. The hob 512 is mounted on the tool holder 511 via a shaft connection, allowing for flexible rotation. The front end of the tool holder 511 is inserted into the interface 221 of the rotating disk 22, ensuring efficient power transmission during the cutting process. The end of the hob 512 is equipped with a gear 513, which meshes with the internal gear ring 514 on the gear ring seat 52, thereby realizing power transmission and completing the cutting action.

[0068] The gear ring seat 52 is an important support component in the cutting device, and it is installed on the first mounting hole 12 on the rear side of the main housing 10. The gear ring seat 52 not only provides stable support and precise positioning for the hob assembly 51, but also transmits power through its internal gear ring 514 meshing with the gear 513 of the hob assembly 51. The outer periphery of the gear ring seat 52 has two protrusions r1, and the first mounting hole 12 of the main housing 10 has two corresponding notches r2. Through the cooperation of the protrusions r1 and the notches r2, the gear ring seat 52 can be securely installed on the main housing 10. Furthermore, the inner edge of the first mounting hole 12 has a chamfer s for locking the gear ring seat 52, and a limiting part s1, which restricts the continued rotation of the gear ring seat 52 and ensures its stability during use.

[0069] The crank handle 53 is located outside the main housing 10 and is the main component for the user to operate the pencil sharpener. The user provides power to the cutting device by cranking the crank handle 53. The end of the crank handle 53 is connected to the rear end of the blade holder 511. Through the meshing of the internal gear ring 514 of the gear ring seat 52 and the gear 513 of the hob assembly 51, the rotational motion of the crank handle 53 is transmitted to the hob 512, thereby realizing the pencil cutting action.

[0070] During the cutting process, the pencil is gripped by the clamping wheel assembly 23 of the feeding device 20 and fed into the cutting device 50. The front end of the roller assembly 51 is precisely aligned with the interface 221 of the rotating disk 22. When the user cranks the handle 53, power is transmitted to the roller assembly 51 through the gear ring seat 52, and the roller 512 begins to rotate and cut the pencil. The debris generated during the cutting process enters the dust collection box 40 through the rear opening of the main housing 10, thereby keeping the inside of the pencil sharpener clean.

[0071] Preferably, in order to achieve a stable connection between the dust collection box 40 and the main housing 10 and to facilitate the collection of debris generated during the cutting process, this embodiment adopts a unique interface design. Specifically, an inner interface 14 is provided at the lower end of the main housing 10, while a matching outer interface 41 is provided at the upper end of the dust collection box 40. This technical approach allows the dust collection box 40 to be easily installed and disassembled, facilitating cleaning and maintenance by the user.

[0072] The outer wall of the inner interface 14 is provided with a protruding rib 141, while the inner wall of the outer interface 41 is provided with a groove 411 that matches the protruding rib 141. When the outer interface 41 of the dust collection box 40 is fitted onto the inner interface 14 of the main housing 10, the protruding rib 141 will precisely engage with the groove 411. This snap-fit ​​fastening method not only ensures a stable connection between the dust collection box 40 and the main housing 10, but also effectively prevents the dust collection box from loosening or falling off due to vibration or external force during use.

[0073] Ultimately, the dust collection box 40 fits snugly against the lower end of the main housing 10, forming a sealed collection space. During operation, the shavings produced by the sharpener enter the dust collection box 40 through the rear opening of the main housing 10, preventing shavings from scattering outside and keeping the environment clean. Furthermore, this interface allows users to easily remove the dust collection box 40 when needed, empty the shavings, and clean it, further enhancing the ease of use and user experience of the sharpener.

[0074] This unique interface design is a key innovation of this technical solution. It not only solves the problems of loose dust collection boxes and easy leakage of shavings in traditional pencil sharpeners, but also achieves efficient shavings collection and management through a simple structure, further improving the overall performance and safety of the pencil sharpener.

[0075] Preferably, the main housing 10 adopts an integrated design, consisting of a top wall 05, a front wall 01, a left wall 03, a right wall 04, and a rear wall 02, forming a robust and compact outer shell structure. This technique not only enhances the overall stability of the main housing 10 but also optimizes the utilization efficiency of the internal space, providing sufficient space for the installation of various components while maintaining a simple appearance.

[0076] A pencil inlet hole 11 is provided on the front wall 01 of the main housing 10, which is the entrance for the pencil to enter the pencil sharpener. Its position and size are carefully designed to ensure that the pencil can be smoothly inserted and accurately held by the pencil feeding device 20. A first mounting hole 12 is provided on the rear wall 02 for mounting the core component of the cutting device 50—the gear ring seat 52. This design ensures that the cutting device 50 can be firmly fixed in the main housing 10 and precisely docked with the pencil feeding device 20 to achieve efficient cutting function.

[0077] like Figure 6 and Figure 7As shown, to ensure the stable installation of the dust baffle 30, the inner surfaces of the left wall 03 and rear wall 02 of the main housing 10 are respectively provided with insertion slots 13. These insertion slots 13 match the insertion portions 33 on both sides of the dust baffle 30, fixing the dust baffle 30 inside the main housing 10 by insertion, thereby dividing the inner cavity into a front cavity h1 and a rear cavity h2. This separation not only helps optimize the internal space layout but also effectively prevents debris generated during the cutting process from entering other parts of the main housing 10, extending the service life of the pencil sharpener.

[0078] Furthermore, two straight ribs g spaced apart are provided on both the left wall 03 and the right wall 04. These straight ribs g not only enhance the structural strength of the main housing 10, but also cleverly form part of the insertion groove 13, further optimizing the installation stability of the dust baffle 30. Through this technical means, the dust baffle 30 can be firmly fixed inside the main housing 10, ensuring that it will not loosen or shift during the use of the pencil sharpener, thus providing a reliable guarantee for the efficient operation of the pencil sharpener.

[0079] More preferably, to further enhance the stability and sealing of the connection between the dust collection box 40 and the main housing 10, a transverse rib 141 is provided on the front wall 01 and rear wall 02 of the inner interface 14. These ribs 141 not only enhance the structural strength but also provide precise positioning and stable support for the installation of the dust collection box 40. Meanwhile, a transverse groove 411 matching the rib 141 is provided on the front wall 01 and rear wall 02 of the outer interface 41. This cooperation between the rib and the groove allows the dust collection box 40 to fit tightly against the lower end of the main housing 10, forming a sealed connection that effectively prevents debris generated during cutting from leaking from the interface, maintaining a clean working environment.

[0080] Furthermore, the wall thickness of the inner interface 14 is less than that of the main housing 10, while the wall thickness of the outer interface 41 is less than that of the dust collection box 40. This not only reduces the overall weight but also optimizes material usage and lowers production costs. More importantly, the sum of the wall thicknesses of the inner interface 14 and the outer interface 41 is exactly equal to the wall thickness of the main housing 10. This wall thickness ensures that the dust collection box 40 and the main housing 10 fit perfectly and seamlessly when connected, further enhancing the stability and sealing of the overall structure.

[0081] This unique interface technology not only solves the problems of loose dust collection boxes and easy leakage of shavings in traditional pencil sharpeners, but also achieves efficient shavings collection and management through a simple structure.

[0082] Furthermore, preferably, to further enhance the connection stability between the dust baffle 30 and the main housing 10, the thickness of the insertion part 33 is designed to be greater than the thickness of the plate 31, thereby providing more robust support when inserted into the insertion slot 13. In addition, a locking protrusion v1 is provided on the outer side of the insertion part 33, while corresponding recesses v2 are provided on the left wall 03 and right wall 04 of the main housing 10. This cooperation between the locking protrusion and the recesses not only ensures that the dust baffle 30 can be quickly positioned and securely fixed during installation, but also effectively prevents loosening caused by external forces or vibrations.

[0083] Preferably, to achieve a stable connection between the pen feed device 20 and the dust baffle 30, the second mounting hole 32 is designed as a circular hole located at the center of the plate 31. On both sides of this circular hole, there is a mounting area h for installing the mounting bracket 21. The structure of the mounting area h is very ingenious, as... Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, the assembly includes a notch h1 distributed along an arc, an anti-backward structure h2, and a positioning part h3. The notch h1 is used for initial insertion of the fixing ear 211. The anti-backward structure h2 is a sloped design that allows the fixing ear 211 to elastically deform during insertion, preventing it from accidentally coming out due to external force after assembly. Finally, the fixing ear 211 enters the positioning part h3, a stable position below the high point of the slope, used to ensure the secure installation of the fixing bracket 21 on the dust baffle 30.

[0084] In addition, such as Figures 8 to 11 As shown, the mounting bracket 21 is provided with two fixing ears 211 and an arc-shaped limiting part 212. During assembly, the arc-shaped limiting part 212 will precisely engage with the circular hole of the second mounting hole 32, further enhancing the stability of the mounting bracket 21 and preventing it from rotating or loosening during use. Through this unique assembly design, the pen feeding device 20 can be securely installed on the dust baffle 30.

[0085] Preferably, to ensure that the fixing ear 211 can be securely locked onto the dust baffle 30 after assembly, the anti-backward structure h2 is designed as a slope with a certain angle. When the fixing ear 211 is inserted along this slope, the shape of the slope guides the fixing ear 211 to undergo elastic deformation, thereby generating a certain resistance and preventing it from easily coming out. The positioning part h3 is located at the lower part of the slope, and its height is lower than that of the upper part of the slope. This allows the fixing ear 211 to naturally fall into the positioning part h3 after passing through the slope, forming a stable locked state. The positioning part h3 provides a flat and stable support surface for the fixing ear 211, ensuring that it will not be displaced or loosened due to external forces during use.

[0086] like Figures 12 to 15As shown, Figure 14 and Figure 15 As shown, the gear ring seat 52 has two protrusions r1 on its outer periphery, while the first mounting hole 12 of the main housing 10 has two corresponding notches r2. During assembly, the gear ring seat 52 is initially engaged through the cooperation of the protrusions r1 and the notches r2, and further assembled by rotation. This design not only ensures that the gear ring seat 52 can be quickly positioned, but also achieves a more stable connection through rotation.

[0087] To further enhance the fixing effect of the gear ring seat 52, the inner edge of the first mounting hole 12 of the main housing 10 is provided with a bevel s, which is designed to lock the gear ring seat 52. When the gear ring seat 52 is rotated into place, the bevel s can tightly lock the gear ring seat 52, preventing it from loosening or falling off. In addition, the first mounting hole 12 is also provided with a limiting part s1 to limit the continued rotation of the gear ring seat 52, ensuring that it remains stable during use and will not move accidentally due to external forces.

[0088] Preferably, the hobbing cutter assembly 51 is the core component of the cutting device 50, consisting of a cutter holder 511 and a hobbing cutter 512. The hobbing cutter 512 is mounted on the cutter holder 511 via a shaft connection, allowing it to rotate flexibly to cut the pencil. The front end of the cutter holder 511 has an insert-type structure, precisely inserting into the interface of the rotating disk 22 to ensure efficient power transmission during cutting and stable pencil transport. The rear end of the cutter holder 511 is connected to the crank handle 53, which provides power to the hobbing cutter assembly 51 by cranking the handle 53. Furthermore, the end of the hobbing cutter 512 is equipped with a gear 513, which meshes tightly with the internal gear ring 514 on the gear ring seat 52. Through this gear transmission mechanism, the rotational motion of the crank handle 53 is converted into the cutting motion of the hobbing cutter 512, thereby achieving efficient pencil cutting.

[0089] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0090] This paper introduces an optimized assembly structure for a pencil sharpener and the pencil sharpener itself, as provided by this invention. Specific examples are used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments are merely for the purpose of helping to understand this invention and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An optimized assembly structure for a pencil sharpener, characterized in that: It includes the main housing, pen feeding device, dust baffle, cutting device, and dust collection box; The main housing has a pen inlet hole on the front side and a first assembly hole on the rear side for mounting a cutting device; the dust baffle includes a plate body and a second assembly hole located at the center of the plate body, the plate body has insertion parts on both sides, and the main housing has an insertion groove; the insertion parts of the plate body are inserted into the insertion groove and fixed, dividing the inner cavity of the main housing into a front cavity and a rear cavity; The pen feeding device includes a fixed frame, a rotating disk with an interface, and a pen clamping wheel assembly; the fixed frame is mounted on the dust baffle; the pen clamping wheel assembly corresponds to the pen feeding hole and is used to clamp the pencil; the entire pen feeding device is installed in the front cavity. The cutting device includes a hob assembly, a gear ring seat, and a crank handle. The gear ring seat is installed on the first mounting hole. The hob assembly is located in the rear cavity and is supported and positioned by the gear ring seat. The crank handle is located outside the main housing and is used to drive the hob assembly to rotate. The front end of the hob assembly is connected to the interface of the rotating disk to realize the cutting action of the pencil. The lower end of the main housing has an inner interface, and the upper end of the dust collection box has an outer interface. The outer wall of the inner interface has a rib, and the inner wall of the outer interface has a groove that matches the rib. The outer interface of the dust collection box is fitted over the inner interface of the main housing, and the rib is inserted into the groove, thereby achieving a stable connection between the dust collection box and the main housing, which facilitates the collection of cutting debris.

2. The optimized assembly structure for a pencil sharpener according to claim 1, characterized in that: The main housing includes a top wall, a front wall, a left wall, a right wall, and a rear wall; The pen inlet hole is located on the front wall, and the first assembly hole is located on the rear wall; The insertion slots are respectively provided on the inner surfaces of the left wall and the rear wall.

3. The optimized assembly structure for a pencil sharpener according to claim 1, characterized in that: A transverse rib is provided on the front wall and the rear wall of the inner interface, respectively; The front and rear walls of the external interface are each provided with a transverse groove; The wall thickness of the inner interface is less than the wall thickness of the main housing; the wall thickness of the outer interface is less than the wall thickness of the dust collection box; the inner interface... The sum of the wall thickness of the opening and the wall thickness of the outer interface is the wall thickness of the main housing.

4. The optimized assembly structure for a pencil sharpener according to claim 2, characterized in that: The thickness of the plug-in part is greater than the thickness of the plate body, and the outer side of the plug-in part is provided with a locking protrusion; The left and right walls are respectively provided with recesses that match the card slot protrusions.

5. The optimized assembly structure for a pencil sharpener according to claim 1, characterized in that: The second assembly hole is a circular hole provided on the plate, and an assembly area is provided on each side of the circular hole; The assembly area includes notches distributed along an arc, an anti-backward structure, and a positioning part; The fixing frame is provided with two fixing ears and an arc-shaped limiting part, and the arc-shaped limiting part is inserted into the circular hole; The fixed ear moves along the notch and the anti-backward structure and then enters the positioning part.

6. The optimized assembly structure for a pencil sharpener according to claim 5, characterized in that: The anti-backward structure is an inclined surface that allows the fixed ear to deform, and the positioning part is lower than the high position of the inclined surface.

7. The optimized assembly structure for a pencil sharpener according to claim 2, characterized in that: The left and right walls are each provided with two straight ribs spaced a distance apart, forming the insertion groove.

8. The optimized assembly structure for a pencil sharpener according to claim 1, characterized in that: The outer periphery of the gear ring seat is provided with two protrusions, and the first assembly hole of the main housing is provided with two corresponding notches; the inner edge of the first assembly hole of the main housing is provided with an inclined surface that can lock the gear ring seat; and a limiting part is provided to restrict the continued rotation of the gear ring seat.

9. The optimized assembly structure for a pencil sharpener according to claim 1, characterized in that: The hobbing cutter assembly includes a cutter holder and a hob, with the hob shaft connected to the cutter holder; the front end of the cutter holder is inserted into the interface of the rotating disk; The rear end of the cutter holder is connected to the crank handle, and the end of the hob is provided with a gear that meshes with the internal gear ring on the gear ring seat.

10. A pencil sharpener, characterized in that... Includes the optimized assembly structure for a pencil sharpener as described in any one of claims 1-9.

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