A pencil sharpener lead-in assembly and pencil sharpener

Abstract

The application discloses a pencil sharpener pencil feeding assembly and a pencil sharpener, and belongs to the technical field of pencil sharpeners. The pencil sharpener pencil feeding assembly comprises a first pencil feeding assembly and a second pencil feeding assembly, wherein the first pencil feeding assembly and / or the second pencil feeding assembly comprises a rubber roller and an axle, an axle sleeve and a flange plate are arranged on the outer circumferential surface of the axle, the axle sleeve is in a stepped circular tube structure, the axle sleeve comprises a first axle tube and a second axle tube, the rubber roller is sleeved outside the first axle tube, the two end surfaces of the rubber roller are clamped by the second axle tube and the flange plate respectively, the axle is rotated to drive the axle sleeve and the flange plate to rotate, and the rotating axle sleeve and the rotating flange plate drive the rubber roller to rotate. In the application, the stepped axle sleeve and the flange plate clamp the end surfaces of the rubber roller in the axial direction to transmit the torque, the transmission of the torque and the radial extrusion force of the pencil are decoupled, the feeding speed of the pencil is stable, and the service life of the rubber roller is prolonged.

Description

Technical Field

[0001] This application relates to the field of pencil sharpener technology, and in particular to a pencil sharpener feed assembly and a pencil sharpener. Background Technology

[0002] As a commonly used stationery item, the performance of the automatic pencil feeding mechanism of a pencil sharpener directly affects the sharpening quality and user experience. Current pencil sharpeners generally employ a turbine-impeller transmission structure for their automatic pencil feeding mechanism. The turbine drives the impeller to rotate, which in turn drives the pencil feeding roller to rotate, achieving automatic pencil feeding and ejection.

[0003] Early pencil feeding mechanisms, such as those described in Chinese patent application CN108001092A, disclose an automatic pencil feeding mechanism for a pencil sharpener, comprising a first pencil feeding assembly, a second pencil feeding assembly, and a turbine. The first and / or second pencil feeding assemblies include impellers; the turbine meshes with the impellers, with the turbine being the driving component and the impeller being the driven component; the rotation of the turbine drives the impeller to rotate. This automatic pencil feeding mechanism for a pencil sharpener is compact, reliable in operation, provides smooth transmission, is highly efficient, has a long lifespan, and low noise, while maintaining a constant transmission ratio.

[0004] In long-term production practice, engineers have found that the above technical solution still has some problems: the frictional torque between the pencil feed roller and the drive shaft depends directly or indirectly on the elastic deformation of the rubber material or the axial contact pressure. When the pencil is inserted, the pencil shaft squeezes the rubber roller, causing it to deform radially. The normal pressure between the deformed rubber roller and the drive shaft increases significantly, resulting in fluctuations in frictional torque. This uncontrollable change in friction not only causes unstable pencil feed speed and easy breakage of the pencil lead, but also accelerates the wear of the rubber roller and shortens the service life of the mechanism.

[0005] Therefore, there is an urgent need for a new type of pencil feed component that can achieve stable and controllable frictional torque, is unaffected by pencil pressure, and is easy to adjust precisely, in order to further improve the performance and service life of pencil sharpeners. Utility Model Content

[0006] The technical problem to be solved by this application is to provide a pencil feed assembly and a pencil sharpener, which transmits torque by axially clamping the end face of the rubber roller through a stepped bushing and flange, decoupling the torque transmission from the radial extrusion force of the pencil, thereby achieving stable pencil feed speed and extended rubber roller life.

[0007] The technical solution adopted in this application is as follows: a pencil sharpener feeding assembly and a pencil sharpener, including a first feeding assembly and a second feeding assembly. The first feeding assembly and / or the second feeding assembly includes a rubber roller and a wheel axle. The outer circumferential surface of the wheel axle is provided with a bushing and a flange. The bushing has a stepped cylindrical structure and includes a first shaft tube and a second shaft tube. The rubber roller is sleeved outside the first shaft tube. The two ends of the rubber roller are respectively subjected to the clamping force of the second shaft tube and the flange. The rotation of the wheel axle drives the bushing and the flange to rotate, and the rotating bushing and the flange drive the rubber roller to rotate.

[0008] Compared with existing technologies, the advantages of this application are that the two end faces of the rubber roller contact the end faces of the second shaft tube and the flange, respectively, and transmit power through end-face friction. The contact area and normal pressure of the end faces are determined by the axial distance between the second shaft tube and the flange, and are independent of the thickness of the pencil or the insertion force. Compared with the traditional method that relies on radial elastic deformation to generate friction, the torque transmission of end-face clamping is more stable and more designable, directly solving the problems of unstable pencil feed speed and easy breakage of pencil leads.

[0009] The rubber roller is sleeved outside the first shaft tube, meaning the roller is isolated from the axle by the sleeve. When transmitting torque, the roller only rubs against the sleeve and flange on its end face, and no longer directly contacts the axle radially. Simultaneously, the roller's rotation is synchronized with the first shaft tube, thus eliminating relative friction between the roller's inner wall and the first shaft tube, ensuring smooth operation. This avoids the accelerated wear problem of rubber rollers in the prior art and significantly extends the roller's service life.

[0010] In addition, the stepped cylindrical structure of the bushing serves both radial support and axial force application functions. This integrated design reduces the number of independent parts, making the structure more compact and meeting the needs of miniaturization of pencil sharpeners.

[0011] In some embodiments of this application, the application further includes a turbine, wherein both the first and second pen feed assemblies include an impeller fixed outside the axle, and the turbine meshes with the impeller.

[0012] A single turbine drives two impellers to rotate in opposite directions simultaneously, enabling the two sets of pen feed components to automatically form a rolling feed. This eliminates the need for an additional gear reversing mechanism, minimizes the transmission chain, and results in a compact and reliable structure that ensures strict synchronization of the pen feed speeds on both sides.

[0013] In some embodiments of this application, a limiting ring is provided around the outer periphery of the wheel shaft, the outer end face of the second shaft tube abuts against one side of the limiting ring, the limiting ring separates the impeller from the second shaft tube, and there is a gap between the second shaft tube and the impeller.

[0014] The locating ring provides a precise axial mounting reference for the bushing, ensuring a fixed distance between the second shaft tube and the impeller and preventing interference between the impeller end face and the bushing. It also simplifies the machining of the shaft, eliminating the need for complex positioning steps between the bushing and the impeller, and allowing for rapid axial positioning during assembly.

[0015] In some embodiments of this application, a predetermined distance exists between the first shaft tube and the flange.

[0016] The axial distance between the first shaft tube and the flange is clearly set, which structurally ensures that the clamping force of the flange acts directly on the end face of the rubber roller and will not be diverted to the bushing. This allows the preload of the elastic element to be completely converted into the positive pressure of the end face of the rubber roller, ensuring precise and controllable torque transmission.

[0017] In some embodiments of this application, the flange is connected to an elastic element that applies a force to the flange to move toward the axle.

[0018] By introducing an elastic element to actively apply axial clamping force, the magnitude of end-face friction can be precisely set by the stiffness and compression of the elastic element, completely decoupled from the hardness of the rubber roller itself and the pencil extrusion force, realizing independent and quantitative adjustment of torque, and solving the problem of uncontrollable friction in traditional solutions.

[0019] In some embodiments of this application, a limiting end sleeve is fitted at one end of the axle, one end of the elastic element abuts against the flange, and the other end of the elastic element abuts against the limiting end sleeve. The elastic element is a helical compression spring, a disc spring, or a wave spring.

[0020] The limiting end sleeve provides a reliable axial support surface for the elastic element, so that the preload of the elastic element can be stably maintained and will not become unstable due to assembly gaps or vibrations. At the same time, as an independent part, the limiting end sleeve facilitates the adjustment of the compression of the elastic element, enabling on-site torque debugging and standardized production.

[0021] In some embodiments of this application, both the axle and the bushing are made of plastic.

[0022] In this application, the bushing and the axle generally do not rotate relative to each other. However, when the pencil gets stuck or has difficulty moving in or out, the bushing will rotate relative to the axle. That is, the bushing can actively slip and release pressure, with the inner wall of the plastic bushing rubbing against the outer circumferential surface of the axle. Both the axle and the bushing are made of plastic. The coefficient of friction between hard plastics is stable, and the slippage torque is basically constant, unaffected by the pencil squeezing the rubber roller. This provides precise overload protection and improves the safety and durability of the mechanism.

[0023] In some embodiments of this application, the bushing, flange, and limiting end sleeve are all made of POM plastic.

[0024] POM plastic has high rigidity, low coefficient of friction and excellent self-lubricating properties. When used as bushings, flanges and limiting end sleeves, it can ensure the stable transmission of end face clamping force, reduce power loss from mutual friction, and has a low wear rate under slippage conditions, thus extending the maintenance cycle.

[0025] A pencil sharpener includes a housing, within which a pencil feed assembly is provided.

[0026] Compared with the prior art, the advantage of this application is that the above-mentioned pen feeding component with stable friction torque and controllable pen feeding speed is integrated into the housing, so that the whole machine inherits the core advantage of decoupling torque and pencil extrusion force, directly solving the problem of unstable pen feeding in the prior art, and improving the reliability and user experience of the pencil sharpener product.

[0027] Based on common knowledge in the field, the above-described embodiments can be combined arbitrarily. Attached Figure Description

[0028] The present application will be described in further 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 application. 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.

[0029] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a top view of this application; Figure 3 This is a side view of this application; Figure 4 for Figure 3 A sectional view of section AA in the middle.

[0030] The specific reference numerals in the attached drawings are explained as follows: 1. Rubber roller; 2. Axle; 3. Bushing; 31. First shaft tube; 32. Second shaft tube; 4. Flange; 5. Turbine; 6. Impeller; 7. Limiting ring; 8. Elastic element; 9. Limiting end sleeve. Detailed Implementation

[0031] The present application will now be described in detail with reference to the accompanying drawings.

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] A pencil sharpener feeding assembly and a pencil sharpener, as described in Embodiment 1 Figure 1 , Figure 2 As shown, the device includes a first pen-feeding assembly and a second pen-feeding assembly. The first and / or second pen-feeding assemblies include a rubber roller 1 and a wheel axle 2. The outer circumference of the wheel axle 2 is provided with a bushing 3 and a flange 4. The bushing 3 has a stepped cylindrical structure and includes a first shaft tube 31 and a second shaft tube 32. The rubber roller 1 is sleeved outside the first shaft tube 31, meaning the rubber roller 1 and the wheel axle 2 are isolated by the bushing 3. When transmitting torque, the rubber roller 1 only rubs against the bushing 3 and flange 4 on its end face, and no longer directly rubs against the wheel axle 2 radially. Furthermore, the rotation of the rubber roller 1 is synchronized with the first shaft tube 31, so the inner wall surface of the rubber roller will not rub against the first shaft tube 31, thus not affecting the normal operation of the rubber roller 1. This avoids the problem of accelerated wear of the rubber roller 1 in the prior art and significantly extends the service life of the rubber roller 1. In addition, the stepped cylindrical structure of bushing 3 serves both radial support and axial force application functions. This integrated design reduces the number of independent parts, making the structure more compact and meeting the needs of miniaturization of pencil sharpeners.

[0034] The two ends of the rubber roller 1 are clamped by the second shaft tube 32 and the flange 4, respectively. The rotation of the axle 2 drives the bushing 3 and the flange 4 to rotate, and the rotating bushing 3 and the flange 4 drive the rubber roller 1 to rotate. Power is transmitted through end-face friction. The contact area and normal force of the end faces are determined by the axial distance between the second shaft tube 32 and the flange 4, and are independent of the thickness of the pencil or the insertion force. Compared with the traditional method of generating friction by radial elastic deformation, the torque transmission of end-face clamping is more stable and more designable, directly solving the problems of unstable pencil feed speed and easy breakage of pencil leads.

[0035] Example 2, as Figures 1 to 4 As shown, this application also includes a turbine 5. Both the first and second pen-feeding assemblies include impellers 6 fixed to the outside of the wheel shaft 2, and the turbine 5 meshes with the impellers 6. By using a single turbine 5 to simultaneously drive the two impellers 6 to rotate in opposite directions, the two sets of pen-feeding assemblies automatically form a rolling feed, eliminating the need for an additional gear reversing mechanism, minimizing the transmission chain, resulting in a compact and reliable structure, and ensuring strict synchronization of the pen-feeding speeds on both sides.

[0036] A limiting ring 7 is provided around the outer circumference of the wheel shaft 2. The outer end face of the second shaft tube 32 abuts against one side of the limiting ring 7. The limiting ring 7 separates the impeller 6 from the second shaft tube 32, and there is a gap between the second shaft tube 32 and the impeller 6. The limiting ring 7 provides a precise axial installation reference for the bushing 3, ensuring that the second shaft tube 32 and the impeller 6 maintain a fixed gap and avoiding interference between the end face of the impeller 6 and the bushing 3. At the same time, it simplifies the machining of the wheel shaft 2, eliminating the need for complex positioning steps between the bushing 3 and the impeller 6, and allowing for quick axial positioning during assembly.

[0037] There is a predetermined distance between the first shaft tube 31 and the flange 4. By clearly setting the axial distance between the first shaft tube 31 and the flange 4, the structure ensures that the clamping force of the flange 4 acts directly on the end face of the rubber roller 1 and will not be diverted to the bushing 3. This ensures that the preload of the elastic element 8 is completely converted into the positive pressure of the end face of the rubber roller 1, thus ensuring the precise and controllable torque transmission.

[0038] The flange 4 is connected to an elastic element 8, which applies a force to the flange 4 to move toward the axle 2. By introducing the elastic element 8 to actively apply axial clamping force, the magnitude of the end face friction force can be precisely set by the stiffness and compression of the elastic element 8, completely decoupled from the hardness of the rubber roller 1 itself and the pencil extrusion force, realizing independent and quantitative adjustment of torque, and solving the problem of uncontrollable friction force in traditional solutions.

[0039] One end of the axle 2 is fitted with a limiting end sleeve 9. One end of the elastic element 8 abuts against the flange 4, and the other end of the elastic element 8 abuts against the limiting end sleeve 9. The elastic element 8 is a helical compression spring, a disc spring, or a wave spring. The limiting end sleeve 9 provides a reliable axial support surface for the elastic element 8, ensuring that the preload of the elastic element 8 can be stably maintained and will not become unstable due to assembly gaps or vibrations. At the same time, as an independent part, the limiting end sleeve 9 facilitates the adjustment of the compression of the elastic element 8, enabling on-site torque adjustment and standardized production.

[0040] Both the axle 2 and the bushing 3 are made of plastic. In this application, the bushing 3 and the axle 2 generally do not rotate relative to each other. However, when the pencil gets stuck or has difficulty moving in or out, the bushing 3 will rotate relative to the axle 2. That is, the bushing 3 can actively slip and release pressure, and the inner wall of the plastic bushing 3 rubs against the outer circumferential surface of the axle 2. Since both the axle 2 and the bushing 3 are made of plastic, the coefficient of friction between hard plastics is stable, and the slippage torque is basically constant, unaffected by the pencil squeezing the rubber roller 1. This provides precise overload protection and improves the safety and durability of the mechanism.

[0041] The bushing 3, flange 4, and limiting end sleeve 9 are all made of POM plastic. POM plastic has high rigidity, low coefficient of friction, and excellent self-lubricating properties. When used as bushing 3, flange 4, and limiting end sleeve 9, it can ensure the stable transmission of end face clamping force, reduce power loss from mutual friction, and has a low wear rate under slippage conditions, thus extending the maintenance cycle.

[0042] A pencil sharpener, according to embodiment three, includes a housing, wherein the housing is provided with a pencil sharpener feeding assembly as described in embodiment one or embodiment two.

[0043] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A pencil feed assembly for a pencil sharpener, characterized in that, The device includes a first pen feed assembly and a second pen feed assembly. The first pen feed assembly and / or the second pen feed assembly include a rubber roller (1) and a wheel axle (2). The outer circumferential surface of the wheel axle (2) is provided with a bushing (3) and a flange (4). The bushing (3) has a stepped cylindrical structure and includes a first shaft tube (31) and a second shaft tube (32). The rubber roller (1) is sleeved outside the first shaft tube (31). The two ends of the rubber roller (1) are respectively subjected to the clamping force of the second shaft tube (32) and the flange (4). The rotation of the wheel axle (2) drives the bushing (3) and the flange (4) to rotate. The rotating bushing (3) and the flange (4) drive the rubber roller (1) to rotate.

2. The pencil feed assembly for a pencil sharpener according to claim 1, characterized in that, It also includes a turbine (5), and both the first and second pen feed assemblies include an impeller (6) fixed outside the wheel shaft (2), and the turbine (5) meshes with the impeller (6).

3. The pencil feed assembly for a pencil sharpener according to claim 2, characterized in that, A limiting ring (7) is provided on the outer periphery of the wheel shaft (2). The outer end face of the second shaft tube (32) abuts against one side of the limiting ring (7). The limiting ring (7) separates the impeller (6) from the second shaft tube (32). There is a gap between the second shaft tube (32) and the impeller (6).

4. The pencil feed assembly for a pencil sharpener according to claim 1, characterized in that, There is a predetermined distance between the first shaft tube (31) and the flange (4).

5. A pencil sharpener feeding assembly according to claim 1, characterized in that, The flange (4) is connected to an elastic element (8), which applies a force to the flange (4) to move toward the axle (2).

6. A pencil sharpener feeding assembly according to claim 5, characterized in that, One end of the axle (2) is fitted with a limiting end sleeve (9), one end of the elastic element (8) abuts against the flange (4), and the other end of the elastic element (8) abuts against the limiting end sleeve (9). The elastic element (8) is a helical compression spring, a disc spring, or a wave spring.

7. A pencil sharpener feeding assembly according to claim 1, characterized in that, Both the wheel axle (2) and the bushing (3) are made of plastic.

8. A pencil sharpener feeding assembly according to claim 1, characterized in that, The bushing (3), flange (4), and limiting end sleeve (9) are all made of POM plastic.

9. A pencil sharpener, characterized in that, It includes a housing, wherein the housing contains a pencil sharpener feed assembly as described in any one of claims 1-8.

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