Pencil lead sharpening device

Abstract

The application discloses a pencil feeding mechanism of a pencil sharpener and belongs to the technical field of pencil sharpeners. The pencil feeding mechanism comprises a pencil feeding driving assembly, a limiting piece and a pencil feeding guide assembly. The pencil feeding guide assembly is located above the pencil feeding driving assembly. The pencil feeding guide assembly is connected with the pencil feeding driving assembly through the limiting piece. A pencil tip is inserted into the pencil feeding driving assembly through the pencil feeding guide assembly. At least two limiting parts are arranged on the limiting piece. The pencil feeding driving assembly is connected with the limiting parts of the limiting piece. Different limiting parts limit different maximum center distances of the pencil feeding driving assembly. When the pencil feeding guide assembly is subjected to the thrust force caused by the insertion of the pencil, the pencil feeding guide assembly moves outward and expands. The outward movement of the pencil feeding guide assembly pushes the limiting piece to move. The moving limiting piece connects different limiting parts with the pencil feeding guide assembly. The application integrates multiple-gear limiting structures into a single limiting piece, simplifies the structure, and realizes stable clamping and smooth pencil feeding of pencils with different diameters.

Description

Technical Field

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

[0002] In the modern stationery market, pencil sharpeners are a common tool widely used in schools and offices. While traditional manual pencil sharpeners are simple and easy to use, they cannot meet users' needs in terms of efficiency and convenience. Therefore, electric pencil sharpeners have emerged as a more efficient option. Driven by a motor, electric pencil sharpeners can quickly and evenly sharpen pencils, greatly improving efficiency.

[0003] An electric pencil sharpener typically consists of a pencil feeding mechanism and a sharpening mechanism. During sharpening, the pencil passes through the feeding mechanism into the sharpening mechanism. Once the pencil is in place, the feeding mechanism clamps it, and then the sharpening mechanism cuts the pencil tip. After sharpening, the feeding mechanism can also eject the pencil from the sharpener.

[0004] Currently, there are many types of pencils on the market, with triangular, round, and perforated pencils becoming increasingly popular. These pencils differ from traditional pencils in shape and diameter, which places higher demands on pencil sharpeners. There is a need for pencil sharpeners to be universally compatible and capable of sharpening pencils of different diameters and shapes. Conventional pencil-feeding mechanisms on the market rely on springs for gripping, but the gripping force provided by the spring depends primarily on its deformation. This results in sufficient gripping force when the inserted pencil diameter is large, but insufficient gripping force when the inserted pencil diameter is small, potentially leading to pencil slippage.

[0005] Chinese patent application "Pen Feeding Mechanism of Pencil Sharpener", application number: CN202423074524.3, discloses a mechanism including a synchronizing element, a pen feeding drive component, a limiting element, and a pen feeding guide component. The pen feeding guide component is located above the pen feeding drive component. The pencil tip passes through the pen feeding guide component and is inserted into the pen feeding drive component. Both ends of the pen feeding drive component are connected to the limiting element through the synchronizing element. The limiting element restricts the pen feeding drive component to a retracted state. The pen feeding guide component moves outward and expands when pushed by the insertion of the pencil. After moving outward a certain distance, the pen feeding guide component pushes the limiting element to move, and the moving limiting element disengages from the pen feeding drive component.

[0006] The aforementioned patent application improves the clamping stability of small-diameter pencils to a certain extent, but its structure relies on the limiting component and guide groove to achieve synchronous movement and limiting of the pencil feed roller, resulting in a relatively complex structure, a large number of parts, and greater difficulty in assembly and debugging. Utility Model Content

[0007] The technical problem to be solved by this application is to provide a pencil feeding mechanism for a pencil sharpener, which integrates a multi-position limiting structure into a single limiting component, thereby simplifying the structure and achieving stable clamping and smooth feeding of pencils of different diameters.

[0008] The technical solution adopted in this application is as follows: a pencil feeding mechanism for a pencil sharpener, including a pencil feeding drive component, a limiting component, and a pencil feeding guide component. The pencil feeding guide component is located above the pencil feeding drive component and is connected to the pencil feeding drive component through the limiting component. The pencil tip passes through the pencil feeding guide component and is inserted into the pencil feeding drive component. The limiting component is provided with at least two limiting parts, and the pencil feeding drive component is connected to the limiting parts of the limiting component. Different limiting parts limit different maximum center distances of the pencil feeding drive component. When the pencil is inserted, the pencil feeding guide component moves outward and expands. The outward movement of the pencil feeding guide component will push the limiting component to move, and the moving limiting component will switch between different limiting parts connected to the pencil feeding guide component.

[0009] Compared with existing technologies, the advantage of this application is that it eliminates the synchronizing element and guide groove used in existing technologies to coordinate the movement of the pen feeding drive component, and directly integrates different limiting functions onto a single limiting element. This design significantly reduces the number of parts, simplifies the assembly relationship, and thus reduces the assembly complexity and debugging difficulty of the entire pen feeding mechanism.

[0010] The pen feed drive assembly is mechanically locked directly by different limiting parts on the limiting member, keeping it within a preset space. The limiting member has at least two limiting parts, corresponding to different extreme positions of the pen feed drive assembly's movement. When pencils of different diameters are inserted, the pen feed guide assembly pushes the limiting member to move, automatically switching to the corresponding limiting part. This allows the mechanism to more accurately match various pencil diameters (e.g., standard and thick pencils), providing sufficient clamping force while optimizing the pen feed feel.

[0011] In some embodiments of this application, the limiting member is an inverted T-shaped structure, and the limiting part is an opening, groove, or step structure formed on the limiting member.

[0012] The inverted T-shaped structure provides excellent structural stability, and the bilaterally symmetrical structure makes the limiting component less prone to skewing or twisting under force, thus ensuring the reliability of the limiting function. Openings, slots, or steps are used as specific implementations of the limiting part, with simple structures and easy processing and manufacturing.

[0013] In some embodiments of this application, the limiting part includes symmetrical limiting ports on the limiting member, two or more limiting parts are arranged in two columns on the limiting member, the limiting ports in the same column are connected, and the rotating shaft of the pen feeding drive component is located in the corresponding limiting port.

[0014] In this application, the function of the limiting port is to lock the maximum center distance of the pen feed drive component. Different limiting ports are interconnected, allowing for switching between different maximum center distances. This better meets the needs of sharpening pens of different diameters on the market.

[0015] In some embodiments of this application, the limiting port includes a first side and a second side. The two first sides of the limiting portion are close to each other, and the two second sides of the limiting portion are far apart from each other. The positions of the second sides of the limiting ports located in the same column are not on the same straight line.

[0016] Preferably, the limiting member is provided with two limiting parts, and two connected limiting ports are provided in a column. The two first sides in the same column are located on the same vertical line, and the two second sides in the same column are connected by an inclined plane. Among the two limiting ports in the same column, the horizontal length of the upper limiting port is greater than the horizontal length of the lower limiting port.

[0017] By setting a vertically aligned first side, a precise guiding reference is provided for the vertical movement of the pen-feeding drive component. The upper limiting port has a larger lateral length, providing more room for movement when accommodating larger diameter pencils. This directly reduces the initial resistance (i.e., "insertion force") required when inserting large-diameter pencils, optimizing the user experience. When inserting larger diameter pencils, the center distance of the pencil is opened in advance, preventing excessive insertion force. Smaller diameter pencils do not drive the limiting component to move, thus maintaining a good sharpening experience. In some embodiments of this application, the pen feeding drive assembly includes a first pen feeding assembly and a second pen feeding assembly, which are arranged opposite to each other to hold a pencil; the rotating shafts of the first pen feeding assembly and the second pen feeding assembly are respectively located in two limiting ports of the same limiting part.

[0018] By placing the pivots of the two pen feed components in the two corresponding limiting ports of the same limiting part, the movement of the two pen feed components in each position is synchronously and symmetrically restricted, thereby ensuring the centering and stability of the pencil clamp.

[0019] In some embodiments of this application, the pen guide assembly includes two symmetrically arranged guide members with a predetermined distance between them. When a pencil is inserted between the two guide members, it pushes the guide members to move outward and expand. After the guide members move outward a certain distance, they push the limit members to move downward.

[0020] The predetermined spacing forms a simple trigger threshold, ensuring that only when a pencil of a certain diameter is inserted will the expansion of the guide be sufficient to move the limiting component. This achieves automatic differentiation and response to small-diameter pencils (which do not trigger movement) and large-diameter pencils (which trigger movement and shift gears). After the limiting component moves downward a certain distance, the shaft that was originally located in the lower limiting port will switch to the upper limiting port.

[0021] In some embodiments of this application, the top surface of the limiting member is provided with a slot, the bottom surface of the slot is an inclined guide surface, and an extension rod is provided on the outer side of the guide member. The movable extension rod extends into the slot and applies force to the guide surface.

[0022] By cooperating with the guide surface and the extension rod, the horizontal expansion motion of the guide component is efficiently converted into the vertical motion required by the limiting component, thus realizing the conversion of motion form.

[0023] In some embodiments of this application, a base is also included, and the pen-feeding drive assembly and the limiting member are both disposed on the base; the limiting member is connected to a return spring, and the return spring applies a force to the limiting member to move upward.

[0024] Under the action of the return spring, the limiting member will remain in the high position without external pushing force, and the shaft of the pen feed drive assembly will be located in the lower limiting slot. The setting of the return spring provides the limiting member with an automatic reset function. When the pencil is pulled out, the limiting member can automatically return to the initial (high position) state under the action of spring force, so that the mechanism is ready for the next pen feed (default to the small pencil diameter setting), improving the convenience of use and the reliability of cyclic operation.

[0025] In some embodiments of this application, a sliding groove is provided on the inner wall surface of the base, and a protruding ridge is provided on the limiting member. The protruding ridge is embedded in the sliding groove, and the limiting member moves along the sliding groove.

[0026] The combination of the groove and the convex ridge provides precise and stable linear guidance for the movement of the limiting component, effectively preventing the limiting component from deviating, shaking or rotating during movement, ensuring the accuracy of its movement trajectory, and thus guaranteeing the precise execution of gear shifting actions.

[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 for Figure 2 Sectional view of section AA; Figure 4 This is a schematic diagram of the internal structure of this application; Figure 5 for Figure 4 Side view.

[0030] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Limiting component; 2. First pen feed assembly; 3. Second pen feed assembly; 5. Guide component; 6. Base; 7. Return spring; 8. Slide groove; 9. Protruding ridge; 10. Limiting opening; 101. First side; 102. Second side; 11. Rotating shaft; 12. Groove; 13. Guide surface; 14. Extension rod. 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] The pencil feed mechanism of the pencil sharpener, as described in Example 1 Figures 1 to 3The device includes a pencil feeding drive assembly, a limiting member 1, and a pencil feeding guide assembly. The pencil feeding guide assembly is located above the pencil feeding drive assembly and is connected to it via the limiting member 1. The pencil tip passes through the pencil feeding guide assembly and is inserted into the pencil feeding drive assembly. The limiting member 1 has at least two limiting parts, and the pencil feeding drive assembly is connected to these limiting parts. Different limiting parts define different maximum center distances for the pencil feeding drive assembly. The different limiting parts on the limiting member 1 directly and mechanically lock the pencil feeding drive assembly, keeping it within a preset space. The limiting member 1 has at least two limiting parts, corresponding to different extreme positions of the pencil feeding drive assembly's movement. When pencils of different diameters are inserted, the pencil feeding guide assembly pushes the limiting member 1 to move, automatically switching to the corresponding limiting part. This allows the mechanism to more accurately match various pencil diameters (e.g., standard and thick pencils), providing sufficient clamping force while optimizing the pencil feeding experience.

[0034] The pen feed guide assembly expands outward when pushed by the insertion of the pencil. This outward movement pushes the limiting member 1 to move, and the moving limiting member 1 switches between different limiting parts connected to the pen feed guide assembly. This design eliminates the synchronization components and guide grooves used in the prior art to coordinate the movement of the pen feed drive assembly, directly integrating different limiting functions onto a single limiting member 1. This significantly reduces the number of parts, simplifies assembly relationships, and thus reduces the assembly complexity and debugging difficulty of the entire pen feed mechanism.

[0035] Example 2, as Figures 1 to 5 As shown, the limiting member 1 has an overall inverted T-shaped structure, and the limiting part is an opening, groove, or step structure formed on the limiting member 1. The inverted T-shaped structure provides good structural stability, and the left-right symmetrical structure makes the limiting member 1 less prone to tilting or twisting under force, thereby ensuring the reliability of the limiting function. Openings, grooves, or steps, as specific implementations of the limiting part, have simple structures and are easy to process and manufacture.

[0036] The limiting part includes symmetrical limiting openings 10 formed on the limiting member 1. Two or more limiting parts are arranged in two rows on the limiting member 1, and the limiting openings 10 in the same row are connected. The rotating shaft 11 of the pen feeding drive assembly is located within the corresponding limiting opening 10. In this application, the function of the limiting opening 10 is to lock the maximum center distance of the pen feeding drive assembly. Different limiting openings 10 are interconnected, which allows for switching between different maximum center distances. This better meets the needs of sharpening pens of different diameters on the market.

[0037] The limiting port 10 includes a first side 101 and a second side 102. The two first sides 101 of the limiting part are close to each other, and the two second sides 102 of the limiting part are far apart from each other. The positions of the second sides 102 of the limiting port 10 located in the same column are not on the same straight line.

[0038] Preferably, the limiting member 1 is provided with two limiting parts, and two connected limiting ports 10 are provided in a column. The two first side edges 101 located in the same column are on the same vertical line, and the two second side edges 102 located in the same column are connected by an inclined plane. Among the two limiting ports 10 located in the same column, the lateral length of the upper limiting port 10 is greater than that of the lower limiting port 10. By setting the vertically aligned first side edges 101, a precise guiding reference is provided for the vertical movement of the pen-feeding drive component. The upper limiting port 10 has a larger lateral length, providing more room for movement when accommodating larger diameter pencils. This directly reduces the initial resistance (i.e., "insertion force") required to insert a large diameter pencil, optimizing the user experience. When inserting a larger diameter pencil, the insertion force is not too heavy because the center distance of the larger pencil is opened in advance. The smaller diameter pencil does not drive the limiting member 1 to move, and a good pencil-sharpening experience can still be achieved. The pencil feeding drive assembly includes a first pencil feeding assembly 2 and a second pencil feeding assembly 3, which are arranged opposite each other to clamp the pencil. The rotating shafts 11 of the first pencil feeding assembly 2 and the second pencil feeding assembly 3 are respectively located in two limiting ports 10 of the same limiting part. By placing the rotating shafts 11 of the two pencil feeding assemblies in the two corresponding limiting ports 10 of the same limiting part, the movement of the two pencil feeding assemblies in each position is synchronously and symmetrically limited, thereby ensuring the centering and stability of the pencil clamping.

[0039] The pencil guide assembly includes two symmetrically arranged guide members 5. A predetermined gap exists between the guide members 5 and the limiting member 1. When a pencil is inserted between the two guide members 5, it pushes the guide members 5 to move outward and expand. After the guide members 5 move outward a certain distance, they push the limiting member 1 to move downward. The predetermined gap constitutes a simple trigger threshold, ensuring that only when a pencil of a certain diameter is inserted can the expansion of the guide members 5 accumulate to a sufficient extent to push the limiting member 1 to move. This achieves automatic differentiation and response to small-diameter pencils (which do not trigger movement) and large-diameter pencils (which trigger movement and switch gears). After the limiting member 1 moves downward a certain distance, the rotating shaft 11, which was originally located in the lower limiting port 10, will switch to the upper limiting port 10.

[0040] The top surface of the limiting member 1 has a slot 12, and the bottom surface of the slot 12 is an inclined guide surface 13. An extension rod 14 is provided on the outer side of the guide member 5. The movable extension rod 14 extends into the slot 12 and applies force to the guide surface 13. Through the cooperation of the guide surface 13 and the extension rod 14, the horizontal expansion motion of the guide member 5 is efficiently converted into the vertical motion required by the limiting member 1, thus realizing the conversion of the motion form.

[0041] This application also includes a base 6, on which the pen-feeding drive assembly and the limiting member 1 are both disposed. The limiting member 1 is connected to a return spring 7, which applies an upward force to the limiting member 1. Under the action of the return spring 7, the limiting member 1 will remain in a high position without external pushing force, and the rotating shaft 11 of the pen-feeding drive assembly will be located in the lower limiting port 10. The setting of the return spring 7 provides the limiting member 1 with an automatic reset function. When the pencil is pulled out, the limiting member 1 can automatically return to the initial (high position) state under the action of the spring force, preparing the mechanism for the next pen feed (defaulting to the small pencil diameter setting), improving ease of use and reliability of cyclic operation.

[0042] The inner wall of the base 6 is provided with a sliding groove 8, and the limiting member 1 is provided with a protruding ridge 9, which is embedded in the sliding groove 8. The limiting member 1 moves along the sliding groove 8. The cooperation between the sliding groove 8 and the protruding ridge 9 provides precise and stable linear guidance for the movement of the limiting member 1, effectively preventing the limiting member 1 from deviating, shaking or rotating during movement, ensuring the accuracy of its movement trajectory, and thus ensuring the precise execution of gear shifting actions.

[0043] The rest of the contents of Example 2 are the same as those of Example 1.

[0044] 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. The pencil feeding mechanism of a pencil sharpener, characterized in that, The device includes a pen feeding drive assembly, a limiting member (1), and a pen feeding guide assembly. The pen feeding guide assembly is located above the pen feeding drive assembly and is connected to the pen feeding drive assembly through the limiting member (1). The pencil tip passes through the pen feeding guide assembly and is inserted into the pen feeding drive assembly. The limiting member (1) is provided with at least two limiting parts. The pen feeding drive assembly is connected to the limiting parts of the limiting member (1). Different limiting parts limit different maximum center distances of the pen feeding drive assembly. The pen feeding guide assembly moves outward and expands when pushed by the insertion of the pencil. The outward movement of the pen feeding guide assembly will push the limiting member (1) to move. The moving limiting member (1) will switch different limiting parts to connect with the pen feeding guide assembly.

2. The pencil feeding mechanism of the pencil sharpener according to claim 1, characterized in that, The limiting member (1) is an inverted T-shaped structure, and the limiting part is an opening, groove or step structure formed on the limiting member (1).

3. The pencil feeding mechanism of the pencil sharpener according to claim 2, characterized in that, The limiting part includes a limiting port (10) that is symmetrically opened on the limiting member (1). Two or more limiting parts are arranged in two columns on the limiting member (1), and the limiting ports (10) in the same column are connected. The rotating shaft (11) of the pen-feeding drive assembly is located in the corresponding limiting port (10).

4. The pencil feeding mechanism of the pencil sharpener according to claim 3, characterized in that, The limiting port (10) includes a first side (101) and a second side (102). The two first sides (101) of the limiting part are close to each other, and the two second sides (102) of the limiting part are far apart from each other. The positions of the second sides (102) of the limiting port (10) located in the same column are not on the same straight line.

5. The pencil feeding mechanism of the pencil sharpener according to claim 1, characterized in that, The limiting member (1) is provided with two limiting parts, and two connected limiting ports (10) are provided in a column. The two first side edges (101) in the same column are located on the same vertical line, and the two second side edges (102) in the same column are connected by an inclined plane. Among the two limiting ports (10) in the same column, the horizontal length of the upper limiting port (10) is greater than the horizontal length of the lower limiting port (10).

6. The pencil feeding mechanism of the pencil sharpener according to claim 3, characterized in that, The pen feeding drive assembly includes a first pen feeding assembly (2) and a second pen feeding assembly (3), which are arranged opposite to each other to hold the pencil; the rotating shafts (11) of the first pen feeding assembly (2) and the second pen feeding assembly (3) are respectively located in two limiting ports (10) of the same limiting part.

7. The pencil feeding mechanism of the pencil sharpener according to claim 1, characterized in that, The pen guide assembly includes two symmetrically arranged guides (5). There is a predetermined gap between the guides (5) and the limiting member (1). When the pencil is inserted between the two guides (5), it pushes the guides (5) to move outward and expand. After the guides (5) move outward a certain distance, they will push the limiting member (1) to move downward.

8. The pencil feeding mechanism of the pencil sharpener according to claim 7, characterized in that, The top surface of the limiting member (1) is provided with a slot (12), the bottom surface of the slot (12) is an inclined guide surface (13), and an extension rod (14) is provided on the outside of the guide member (5). The movable extension rod (14) extends into the slot (12) and applies force to the guide surface (13).

9. The pencil feeding mechanism of the pencil sharpener according to claim 1, characterized in that, It also includes a base (6), on which the pen-feeding drive assembly and the limiting member (1) are both disposed; the limiting member (1) is connected to a reset spring (7), which applies a force to the limiting member (1) to move upward.

10. The pencil feeding mechanism of the pencil sharpener according to claim 9, characterized in that, The inner wall of the base (6) is provided with a sliding groove (8), and the limiting member (1) is provided with a protruding ridge (9). The protruding ridge (9) is embedded in the sliding groove (8), and the limiting member (1) moves along the sliding groove (8).

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