Pencil feeding mechanism of pencil sharpener

Abstract

The utility model discloses a pencil feeding mechanism of a pencil sharpener, and belongs to the technical field of pencil feeding of the pencil sharpener, the pencil feeding mechanism comprises a synchronizing part, a pencil feeding driving assembly, a limiting part and a pencil feeding guide assembly, the pencil feeding guide assembly is located above the pencil feeding driving assembly, and a pencil tip penetrates through the pencil feeding guide assembly to be inserted into the pencil feeding driving assembly; the two ends of the pen feeding driving assembly penetrate through the synchronizing piece to be connected with the limiting piece, and the limiting piece limits the pen feeding driving assembly to be in a folded state. The pencil feeding guide assembly moves and expands outwards under the thrust of pencil insertion, the limiting piece is pushed to move after the pencil feeding guide assembly moves outwards by a certain distance, and the moving limiting piece is separated from the pencil feeding drive assembly. The structure of the pencil feeding mechanism is further optimized, when a small-diameter pencil is inserted, the pencil feeding driving assembly can provide large clamping force, and it is guaranteed that pencil feeding and discharging are stable and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pencil sharpening device pencil feeding, in particular to a pencil feeding mechanism of a pencil sharpening device. BACKGROUND

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

[0003] Electric pencil sharpeners generally include a pencil feeding mechanism and a pencil sharpening mechanism. When sharpening a pencil, the pencil will pass through the pencil feeding mechanism into the pencil sharpening mechanism. After the pencil is fed into place, the pencil feeding mechanism clamps it, and then the pencil sharpening mechanism cuts the pencil tip. After the pencil is sharpened, the pencil feeding mechanism can also eject the pencil from the pencil sharpener.

[0004] Currently, there are many types of pencils on the market, including triangular, round, and hollow pencils. These pencils have different shapes and diameters from traditional pencils, which puts higher requirements on pencil sharpeners. Pencil sharpeners need to be versatile and able to sharpen pencils of different diameters and shapes. Related prior art, such as Chinese patent application "Self-adaptive pencil feeding mechanism", application number: CN201922501256.1, discloses a pencil feeding mechanism that includes a base, a first pencil feeding assembly, and a second pencil feeding assembly. The first pencil feeding assembly and the second pencil feeding assembly are installed in the base and can move left and right. The base is connected to a guide piece by a spring. The guide piece drives the first pencil feeding assembly and the second pencil feeding assembly to move inward simultaneously. The first pencil feeding assembly and / or the second pencil feeding assembly are driven by the spring to expand outward simultaneously. This mechanism can freely adapt to different diameter pencils.

[0005] In the above-mentioned pencil feeding mechanism, the force that drives the first pencil feeding assembly and the second pencil feeding assembly to move inward simultaneously is mainly provided by the spring connecting the guide piece. However, the clamping force provided by the spring mainly depends on the amount of deformation. This results in a situation where the clamping force provided by the spring is sufficient when a large diameter pencil is inserted, but insufficient when a small diameter pencil is inserted, which may cause the pencil to slip or other problems. To address this issue, the present application provides a new pencil sharpener pencil feeding box structure to solve the above-mentioned problems. INNOVATION CONTENT

[0006] The technical problem to be solved by the present application is to provide a pencil feeding mechanism for a pencil sharpener, which further optimizes the structure of the pencil feeding mechanism. When a small diameter pencil is inserted, the pencil feeding drive assembly can also provide a larger clamping force to ensure stable and reliable feeding and ejection of the pencil.

[0007] The technical scheme adopted by the present application is: the pencil feeding mechanism of the pencil sharpener, comprising a synchronization part, a pencil feeding driving assembly, a limiting part and a pencil feeding guide assembly, the pencil feeding guide assembly is located above the pencil feeding driving assembly, the pencil tip penetrates through the pencil feeding guide assembly and is inserted into the pencil feeding driving assembly, the two ends of the pencil feeding driving assembly penetrate through the synchronization part and are connected with the limiting part, the limiting part limits the pencil feeding driving assembly to be in a folded state; the pencil feeding guide assembly is pushed out and expanded by the thrust of the inserted pencil, and the pencil feeding guide assembly moves outward by a distance and pushes the limiting part to move, and the moving limiting part is separated from the pencil feeding driving assembly.

[0008] Compared with the prior art, the present application has the advantages that the synchronization part is arranged to limit the synchronous movement of the pencil feeding driving assembly, the pencil feeding driving assembly is arranged on the synchronization part, and the pencil feeding driving assembly is also connected with the limiting part. In the present application, the limiting part is added, which is connected with the pencil feeding driving assembly and limits the pencil feeding driving assembly to be in a folded state. The failure of the limiting part is achieved by the pencil feeding guide assembly moving outward by a distance and pushing. That is, when the inserted pencil has a small diameter, the distance moved by the pencil feeding guide assembly is not enough to push the limiting part to move, and the pencil feeding driving assembly will remain in the folded state. Therefore, when a small-diameter pencil is inserted, the pencil feeding driving assembly in the folded state can also provide a large clamping force, ensuring stable and reliable feeding and withdrawing of the pencil. When the inserted pencil has a large diameter, the distance moved by the pencil feeding guide assembly is enough to push the limiting part to move, and the moving limiting part is separated from the pencil feeding driving assembly, the limiting part fails, and the pencil feeding driving assembly is movable. In the present application, the limiting part limits the movement of the synchronization part, so that the pencil feeding driving assembly can remain stable in the folded state, ensuring that the pencil will not be unstable during feeding and withdrawing.

[0009] In the present application, the length of the distance by which the pencil feeding guide assembly moves outward can be set according to the actual diameter of the pencil to be limited. If the distance is set to be long, the diameter of the pencil that can be inserted while the pencil feeding driving assembly remains in the folded state will be large, and if the distance is set to be short, the diameter of the pencil that can be inserted while the pencil feeding driving assembly remains in the folded state will be small.

[0010] In some embodiments of the present application, a group of guide grooves is arranged on each side wall of the synchronization part, a limiting part is arranged outside each side wall of the synchronization part, two limiting openings are symmetrically formed in the limiting part, one end of the limiting opening is open, and the shaft of the pencil feeding driving assembly penetrates through the guide grooves and is clamped into the corresponding limiting opening.

[0011] The limiting part is arranged outside each side wall of the synchronization part, which can effectively limit the movement of the pencil feeding driving assembly. The offset and shaking of the pencil feeding driving assembly during the force receiving process and the movement process are reduced, thereby improving the stability of the overall structure.

[0012] In the application, the structure of the limiting port can be slightly larger than the shaft diameter of the pen driving assembly, so that the pen driving assembly located in the limiting port is freely movable within a certain range, and is suitable for pencils with different diameters.

[0013] In some embodiments of the application, the limiting member has an inverted T-shaped structure as a whole, and comprises a connecting rod and a limiting plate, and the two limiting ports are located on the limiting plate and are respectively located on the two sides of the connecting rod.

[0014] The inverted T-shaped structure provides good gravity distribution, so that the limiting member is more stable during operation and the inclination or deviation caused by external force is reduced.

[0015] In some embodiments of the application, the pen guiding assembly comprises two symmetrical guiding members, and there is a predetermined distance between the guiding members and the connecting rod. When the pencil is inserted between the two guiding members, the guiding members are pushed to move outward and expand. After the guiding members move outward by a distance, the connecting rod pushes the limiting member to separate from the pen driving assembly.

[0016] After the guiding members move outward by a distance, the connecting rod pushes the limiting member to separate from the pen driving assembly, and the length of the distance determines the diameter of the pencil to be limited. In the application, the preferred solution is that when the diameter of the pencil is less than or equal to 8 mm, the limiting member remains connected to the pen driving assembly to limit the pen driving assembly. When the diameter of the pencil is greater than 8 mm, the limiting assembly moves to separate from the pen driving assembly.

[0017] In some embodiments of the application, a slot is formed in the top surface of the connecting rod, the bottom surface of the slot is an inclined guide surface, the outer side of the guiding member is provided with an extension rod, and the structure of the extension rod is adapted to the structure of the slot. The moving extension rod is inserted into the slot to apply force to the guide surface.

[0018] In the application, the guide surface converts the outward moving force of the extension rod into vertical pushing force, and the connecting rod drives the limiting member to move up and down along the vertical direction. The slot is provided, and the structure of the extension rod is adapted to the structure of the slot, so as to limit the displacement of the extension rod, and the whole movement process is more stable and reliable.

[0019] Specifically, the top surface of the limiting port is open. The extension rod moves outward to drive the limiting member to move downward, and the shaft of the pen driving assembly is separated from the top surface of the limiting port.

[0020] In some embodiments of the present application, the base is further provided, the pen driving assembly and the synchronizer are arranged in the base, the limiting member is arranged between the synchronizer and the base, the limiting member is connected with the reset spring, the reset spring applies a force to the limiting member to restore the initial state, a sliding groove is arranged on the inner wall of the base, a convex rib is arranged on the limiting member, and the convex rib is embedded in the sliding groove. The limiting member moves along the sliding groove.

[0021] The sliding groove and the convex rib structure are arranged in the present application to limit the movement track of the limiting member, so that the limiting member does not deviate or shake during movement, thereby improving the working stability of the pencil sharpener.

[0022] In some embodiments of the present application, the guide groove group comprises two guide grooves arranged in an inclined and symmetrical manner, the pen driving assembly comprises a first pen driving rubber roller and a second pen driving rubber roller, the shaft of the first pen driving rubber roller and the shaft of the second pen driving rubber roller are respectively arranged to pass through the two guide grooves, the first pen driving rubber roller and the second pen driving rubber roller expand outward to drive the synchronizer to move upward, the synchronizer is provided with an elastic member, the elastic member applies a force to the synchronizer to drive the first pen driving rubber roller and the second pen driving rubber roller to maintain a mutual folding state.

[0023] In the present application, the force of the first pen driving rubber roller and the second pen driving rubber roller clamping the pencil comes from the elastic member, which can be a straight spring. However, the clamping force provided by the spring has the problem that the clamping force for a pencil with a large diameter is sufficient, and the clamping force for a pencil with a small diameter is insufficient. Therefore, the present application further provides a limiting member on the basis of the elastic member, which limits the clamping state of the first pen driving rubber roller and the second pen driving rubber roller. When the diameter of the inserted pencil is small, the first pen driving rubber roller and the second pen driving rubber roller are kept at the position of the folding state, providing sufficient clamping force.

[0024] In some embodiments of the present application, the present application further comprises a middle base, the middle base is provided with a sliding groove arranged in the radial direction, the guide member is arranged on the sliding groove, and the guide member moves along the sliding groove under the action of force.

[0025] The design of the sliding groove provides a stable movement track for the guide member, reduces the shaking or deviation of the guide member during movement, and ensures the working stability of the pencil sharpener. The movement of the guide member in the sliding groove can more effectively transmit the force when the pencil is inserted, ensuring the uniformity and stability of the clamping force and improving the performance of the pencil sharpener.

[0026] In some embodiments of the present application, the guide member is provided with an inclined groove, the two guide members are connected through a driving piece, the driving piece is arranged on the guide member, the bottom surface of the driving piece is symmetrically provided with two convex columns, and the two convex columns are respectively inserted into the inclined grooves of the two guide members.

[0027] The application realizes the synchronous opening and closing of the two guide pieces by setting the driving piece. This design improves the coordination of the pencil sharpener when clamping the pencil, and enhances the overall working efficiency. In addition, the guide piece can flexibly adjust the position according to the diameter of the pencil, and adapt to different types of pencils.

[0028] In some embodiments of the application, the driving piece is connected to the driving spring, and the driving spring applies a force to the driving piece to maintain the clamping state of the two guide pieces. The design of combining the driving piece with the driving spring reduces the complexity of mechanical parts, makes the overall structure more compact, and reduces the difficulty of manufacturing and maintenance.

[0029] On the basis of common sense in the art, the above-mentioned embodiments can be combined arbitrarily. BRIEF DESCRIPTION OF DRAWINGS

[0030] The application will be further described in detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be regarded as limiting the scope of the application. In addition, unless specifically indicated, the drawings only schematically show the composition or structure conceptually represented by the described objects and can contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0031] Figure 1 is a structural schematic diagram of the application;

[0032] Figure 2 is a structural schematic diagram of the internal structure of the application;

[0033] Figure 3 is a structural schematic diagram of the internal structure of the application; Figure 2

[0034] Figure 4 is a structural schematic diagram of the internal structure of the application;

[0035] In the drawings, the reference signs are specifically explained as follows: 1, synchronous piece; 2, limiting piece; 3, pencil; 4, guide groove; 5, limiting port; 6, connecting rod; 7, limiting plate; 8, guide piece; 9, base; 10, sliding groove; 11, convex rib; 12, first pencil feeding rubber roller; 13, second pencil feeding rubber roller; 14, middle seat; 15, driving piece; 16, driving spring; 17, extension rod; 18, slot; 19, guide surface; 20, elastic piece; 21, convex column; 22, return spring; 23, shaft piece. DETAILED DESCRIPTION

[0036] The application will be further described in detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be regarded as limiting the scope of the application. In addition, unless specifically indicated, the drawings only schematically show the composition or structure conceptually represented by the described objects and can contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0037] ​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.

[0038] The pencil feed mechanism of the pencil sharpener, as described in Example 1 Figures 1 to 3 As shown, the device includes a synchronizing element 1, a pen-feeding drive assembly, a limiting element 2, and a pen-feeding guide assembly. The pen-feeding guide assembly is located above the pen-feeding drive assembly. The tip of the pencil 3 passes through the pen-feeding guide assembly and is inserted into the pen-feeding drive assembly. Both ends of the pen-feeding drive assembly are connected to the limiting element 2 through the synchronizing element 1. The limiting element 2 restricts the pen-feeding drive assembly to a retracted state. The pen-feeding guide assembly expands outward due to the pushing force of the inserted pencil 3. After moving outward a certain distance, the pen-feeding guide assembly pushes the limiting element 2 to move, and the moved limiting element 2 disengages from the pen-feeding drive assembly. In this application, a limiting element 2 is added. The limiting element 2 is connected to the pen-feeding drive assembly and restricts the pen-feeding drive assembly to a retracted state. The failure of the limiting element 2 is caused by the pushing force after the pen-feeding guide assembly moves outward a certain distance.

[0039] In other words, when the inserted pencil 3 has a small diameter, the distance the pen guide assembly moves is insufficient to move the limiting member 2, so the pen drive assembly will remain in the retracted state. Therefore, even with a small-diameter pencil 3, the retracted pen drive assembly can provide a large clamping force, ensuring stable and reliable pen insertion and removal. When the inserted pencil 3 has a large diameter, the distance the pen guide assembly moves is sufficient to move the limiting member 2, causing the moving limiting member 2 to disengage from the pen drive assembly, rendering it ineffective, and allowing the pen drive assembly to move.

[0040] In this application, the setting of the limiting member 2 restricts the movement of the synchronizing member 1, so that the pen-feeding drive component can remain stable in the retracted state, and ensure that the pencil 3 will not be unstable during the forward and backward movement.

[0041] In this application, the length of the outward movement of the pen feeding guide component can be set according to the actual required diameter of the pencil 3. A longer distance allows the pen feeding drive component to hold in the retracted state with a larger diameter pencil 3, while a shorter distance allows the pen feeding drive component to hold in the retracted state with a smaller diameter pencil 3.

[0042] Example 2, as Figures 1 to 4As shown, a set of guide grooves 4 groups are arranged on the two side walls of the synchronizer 1, and a limiting piece 2 is arranged on the outer side of the two side walls of the synchronizer 1, two limiting openings 5 are symmetrically arranged on the limiting piece 2, and one end of the limiting opening 5 is open. The shaft 23 of the pen driving assembly is clamped into the corresponding limiting opening 5 through the guide groove 4 group. By arranging a limiting piece 2 on the outer side of the two side walls of the synchronizer 1, the movement of the pen driving assembly can be effectively limited, and the deviation and shaking of the pen driving assembly during the stress process and the movement process can be reduced, thereby improving the stability of the overall structure. In the present application, the structure of the limiting opening 5 can be slightly larger than the diameter of the shaft 23 of the pen driving assembly, so that the pen driving assembly located in the limiting opening 5 can move freely within a certain range, and adapt to different diameters of the pencil 3.

[0043] The limiting piece 2 has an inverted T-shaped structure as a whole, and includes a connecting rod 6 and a limiting plate 7. The two limiting openings 5 are located on the limiting plate 7, and the two limiting openings 5 are respectively located on the two sides of the connecting rod 6. The inverted T-shaped structure provides good gravity distribution, so that the limiting piece 2 is more stable during operation, and the inclination or deviation caused by external force is reduced.

[0044] The pen guiding assembly includes two guide pieces 8 arranged symmetrically, and there is a predetermined distance between the guide piece 8 and the connecting rod 6. The pencil 3 is inserted between the two guide pieces 8 to push the guide piece 8 to move outward and expand. After the guide piece 8 moves outward for a distance, the connecting rod 6 pushes the limiting piece 2 to separate from the pen driving assembly. After the guide piece 8 moves outward for a distance, the connecting rod 6 pushes the limiting piece 2 to separate from the pen driving assembly. The length of the distance determines the diameter of the pencil 3 that is limited. In the present application, the preferred solution is that when the diameter of the pencil 3 is less than or equal to 8 mm, the limiting piece 2 remains connected with the pen driving assembly to limit the pen driving assembly. When the diameter of the pencil 3 is greater than 8 mm, the limiting assembly moves away from the pen driving assembly.

[0045] A slot 18 is formed in the top surface of the connecting rod 6, and the bottom surface of the slot 18 is an inclined guide surface 19. The outer side of the guide piece 8 is provided with an extension rod 17, and the structure of the extension rod 17 is adapted to the structure of the slot 18. The moving extension rod 17 extends into the slot 18 to apply force to the guide surface 19. In the present application, the guide surface 19 converts the outward moving force of the extension rod 17 into vertical pushing force, and the connecting rod 6 drives the limiting piece 2 to move up and down along the vertical direction. In the present application, the structure of the slot 18 is adapted to the structure of the extension rod 17, and the displacement of the extension rod 17 is limited, so that the whole movement process is more stable and reliable. Specifically, the top surface of the limiting opening 5 is open. The extension rod 17 moves outward to drive the limiting piece 2 to move downward, and the shaft 23 of the pen driving assembly is separated from the top surface of the limiting opening 5.

[0046] The application also comprises a base 9, the pen feeding driving assembly and the synchronizer 1 are arranged in the base 9, the limiting piece 2 is arranged between the synchronizer 1 and the base 9, the limiting piece 2 is connected with a return spring 22, the return spring 22 applies a force to the limiting piece 2 to restore the initial state, a sliding groove 10 is arranged on the inner wall surface of the base 9, a convex rib 11 is arranged on the limiting piece 2, the convex rib 11 is embedded into the sliding groove 10, and the limiting piece 2 moves along the sliding groove 10. The application sets the structure of the sliding groove 10 and the convex rib 11 to limit the moving track of the limiting piece 2, so that the limiting piece 2 cannot deviate or shake during the movement, thereby improving the working stability of the pencil sharpener.

[0047] The guiding groove 4 group comprises two guiding grooves 4 arranged in an inclined and symmetrical manner, the pen feeding driving assembly comprises a first pen feeding rubber roller 12 and a second pen feeding rubber roller 13, the shaft 23 of the first pen feeding rubber roller 12 and the shaft 23 of the second pen feeding rubber roller 13 are respectively penetrated by the two guiding grooves 4, the first pen feeding rubber roller 12 and the second pen feeding rubber roller 13 expand outward to drive the synchronizer 1 to move upward, the synchronizer 1 is provided with an elastic piece 20, the elastic piece 20 applies a force to the synchronizer 1 to drive the first pen feeding rubber roller 12 and the second pen feeding rubber roller 13 to keep a mutual folding state. In the application, the force of the first pen feeding rubber roller 12 and the second pen feeding rubber roller 13 clamping the pencil 3 comes from the elastic piece 20, and the elastic piece 20 can be a straight spring. However, the clamping force provided by the spring has the problem that the clamping force for a pencil 3 with a large diameter is sufficient, and the clamping force for a pencil 3 with a small diameter is insufficient. Therefore, the application further adds the limiting piece 2 on the basis of the elastic piece 20, and the limiting piece 2 realizes the limitation of the clamping state of the first pen feeding rubber roller 12 and the second pen feeding rubber roller 13. When the diameter of the inserted pencil is small, the first pen feeding rubber roller 12 and the second pen feeding rubber roller 13 keep at the position of the folding state, and sufficient clamping force is provided.

[0048] The other contents of the second embodiment are the same as those of the first embodiment.

[0049] As shown in the third embodiment, Figures 1 to 4 The application also comprises a middle base 14, the middle base 14 is provided with a sliding groove 10 arranged in a radial direction, the guiding piece 8 is arranged on the sliding groove 10, and the guiding piece 8 moves along the sliding groove 10 under the action of force. The design of the sliding groove 10 provides a stable moving track for the guiding piece 8, reduces the shaking or deviation of the guiding piece 8 during the movement, and ensures the working stability of the pencil sharpener. The movement of the guiding piece 8 in the sliding groove 10 can more effectively transmit the force when the pencil 3 is inserted, ensure the uniformity and stability of the clamping force, and improve the performance of the pencil sharpener.

[0050] The guide 8 is provided with an inclined slot, and the two guides 8 are connected through a driving piece 15. The driving piece 15 is arranged on the guide 8, and the bottom surface of the driving piece 15 is symmetrically provided with two convex columns 21 which are respectively inserted into the inclined slots of the two guides 8. The driving piece 15 is arranged to realize the synchronous opening and closing of the two guides 8. The design improves the coordination of the pencil sharpener when clamping the pencil 3, and enhances the overall work efficiency. In addition, the guide 8 can be flexibly adjusted according to the diameter of the pencil 3, and is suitable for different types of pencils 3.

[0051] The driving piece 15 is connected with a driving spring 16 which applies a force to the driving piece 15 to keep the two guides 8 in a clamping state. The combination of the driving piece 15 and the driving spring 16 reduces the complex mechanical components, makes the overall structure more compact, and reduces the difficulty of manufacturing and maintenance.

[0052] The other contents of the third embodiment are the same as those of the first embodiment or the second embodiment.

[0053] The above describes the present application in detail, and the principles and implementation modes of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the present application and the core idea. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made 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 lead advancement mechanism for a pencil sharpener, characterized by, The utility model relates to a pencil holder, including synchronous piece (1), pencil drive assembly, limiting piece (2) and pencil guide assembly, pencil guide assembly is located the top of pencil drive assembly, pencil (3) nib passes through pencil guide assembly and inserts into pencil drive assembly, the both ends of pencil drive assembly pass through synchronous piece (1) and are connected with limiting piece (2), limiting piece (2) limits that pencil drive assembly is in the state of folding, pencil guide assembly is pushed out and expands when being subjected to the thrust of pencil (3) insertion, and pencil guide assembly moves a distance to the outside and then pushes limiting piece (2) to move, and the limiting piece (2) that moves then separates from pencil drive assembly.

2. A lead advancement mechanism for a pencil sharpener as defined in claim 1, wherein Both sides wall of synchronous piece (1) are provided with a group of guide slot (4) group, and the both sides wall of synchronous piece (1) are provided with a limiting piece (2), and two limiting ports (5) are symmetrically set up on the limiting piece (2), and one end of limiting port (5) is open, and the axle (23) of pencil drive assembly passes through guide slot (4) group and is clamped into corresponding limiting port (5).

3. A lead advancement mechanism for a pencil sharpener as defined in claim 2, wherein The limiting piece (2) is integrally inverted T-shaped structure, and the limiting piece (2) includes connecting rod (6) and limiting plate (7), and two limiting ports (5) are located on the limiting plate (7), and two limiting ports (5) are respectively located on the both sides of connecting rod (6).

4. A lead advancement mechanism for a pencil sharpener according to claim 3, wherein The pencil guide assembly includes two guide pieces (8) that are symmetrically arranged, and there is a predetermined spacing between the guide piece (8) and the connecting rod (6), and the pencil (3) is inserted between the two guide pieces (8) to push the guide piece (8) to move outward and expand, and the guide piece (8) moves a distance to the outside and then pushes the limiting piece (2) to separate from the pencil drive assembly through the connecting rod (6).

5. A lead advancement mechanism for a pencil sharpener as defined in claim 4, wherein The top surface of the connecting rod (6) is provided with a notch (18), the bottom surface of the notch (18) is an inclined guide surface (19), the outer side of the guide piece (8) is provided with an extension rod (17), and the structure of the extension rod (17) is adapted to the structure of the notch (18); the moving extension rod (17) is inserted into the notch (18) to apply force to the guide surface (19).

6. The lead advancement mechanism of a sharpener according to claim 1 wherein, It also includes a base (9), the pencil drive assembly and the synchronous piece (1) are arranged in the base (9), the limiting piece (2) is installed between the synchronous piece (1) and the base (9), the limiting piece (2) is connected with a return spring (22), the return spring (22) applies a force to the limiting piece (2) to restore the initial state, the inner wall surface of the base (9) is provided with a sliding groove (10), the limiting piece (2) is provided with a convex rib (11), the convex rib (11) is embedded into the sliding groove (10), and the limiting piece (2) moves along the sliding groove (10).

7. The lead advancement mechanism of a sharpener according to claim 2 wherein, The guide groove (4) group includes two guide grooves (4) arranged in an inclined and symmetrical manner, the pen feeding driving assembly includes a first pen feeding rubber roller (12) and a second pen feeding rubber roller (13), the shaft (23) of the first pen feeding rubber roller (12) and the shaft (23) of the second pen feeding rubber roller (13) respectively pass through the two guide grooves (4), the first pen feeding rubber roller (12) and the second pen feeding rubber roller (13) expand outward to drive the synchronous member (1) to move upward, the synchronous member (1) is provided with an elastic member (20), the elastic member (20) applies a force to the synchronous member (1) to drive the first pen feeding rubber roller (12) and the second pen feeding rubber roller (13) to keep a mutual folding state.

8. The lead advancement mechanism of a sharpener according to claim 4 wherein, The middle seat (14) is further provided with a sliding groove (10) arranged in a radial direction, the guide member (8) is mounted on the sliding groove (10), and the guide member (8) moves along the sliding groove (10) under force.

9. A lead advancement mechanism for a sharpener according to claim 4 or 8, wherein, The guide member (8) is provided with an inclined groove, two guide members (8) are connected through a driving piece (15), the driving piece (15) is arranged on the guide member (8), two convex columns (21) are symmetrically arranged on the bottom surface of the driving piece (15), and the two convex columns (21) are respectively inserted into the inclined grooves of the two guide members (8).

10. A lead advancement mechanism for a pencil sharpener according to claim 9, wherein The driving piece (15) is connected with a driving spring (16), and the driving spring (16) applies a force to the driving piece (15) to keep the two guide members (8) in a clamping state.

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