Mechanical pencil core

Abstract

A mechanical pencil core comprises a sharp sleeve part, a main body part and a lead storage part, the lead storage part comprises a lead storage tube and a connecting part, the connecting part comprises an outer tube and a push rod, and the mechanical pencil core is characterized in that a first cavity and a second cavity are formed in the outer tube in the axial direction, the lead storage tube is installed in the first cavity, and the main body part is installed in the second cavity; the first cavity is communicated with the second cavity, one end of the push rod is connected with the core storage pipe, the other end of the push rod penetrates through the communication position of the first cavity and the second cavity to be connected with the main body component, a first reset elastic piece is further arranged between the first cavity and the core storage pipe, and the sharp sleeve component is embedded in the end, close to the main body component, of the outer pipe. The main body component clamps the pencil lead to move towards the sharp sleeve component and gradually loosens the pencil lead, the lead storage tube is loosened, and the first reset elastic piece drives the lead storage tube to drive the main body component to reset and clamp the pencil lead again. The mechanical pencil core is integrally designed, the structure is simpler and more attractive, and the assembly is very convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical pencils, and particularly relates to a mechanical pencil movement. Background Art

[0002] The Chinese invention patent with the authorization announcement number of CN103963513B discloses a mechanical pencil movement, and its structure is as shown in Figure 1 and Figure 2 , and it includes a tip sleeve component 1a, a main body component 2a and a lead storage component 3a. The tip sleeve component 1a includes a tip sleeve 4a, a movable damper 5a and a damper spring 6a. The main body component 2a is installed in the tip sleeve component 1a and includes a lock ring 7a, a clip 8a, a clip spring 9a and a steel ball 10a. The lead storage component 3a includes a lead storage tube 11a and a connecting part. The connecting part is connected to the rear end of the tip sleeve component 1a and cooperates with the rear end of the main body component 2a. The lead core 12a passes through the lead storage tube 11a and the connecting part, enters the clip 8a, and then passes through the front end of the movable damper 5a for writing. In one embodiment, as shown in Figure 1 , the connecting part includes a joint 13a that is respectively connected to the rear end of the tip sleeve component 1a and the lead storage tube 11a. In another embodiment, as shown in Figure 2 , the connecting part includes an outer tube 14a sleeved outside the lead storage tube 11a and connected to the rear end of the tip sleeve component 1a, and a push rod 15a arranged inside the lead storage tube 11a and tightly fitted with the lead storage tube 11a. A push rod spring 16a is arranged between the outer tube 14a and the push rod 15a.

[0003] However, the existing mechanical pencil movement has the following technical problems: installing the main body component 2a in the tip sleeve component 1a results in a longer axial length of the tip sleeve component 1a, and it is difficult to ignore the proportion of its axial dimension in the whole. Moreover, the tip sleeve component 1a is installed together with the lead storage component 3 in a side docking manner. When the connecting part is set as the joint 13a, the whole movement is divided into three sections along the axial direction. The main body component 2 installed in the tip sleeve component 1a is the first section, the joint 13a is the second section, and the lead storage tube 11a is the third section. When the connecting part is set as the outer tube 14a plus the push rod 15a, the whole movement is divided into two sections along the axial direction. The main body component 2a installed in the tip sleeve component 1a is the first section, and the outer tube 14a is the second section. Whether it is a two-section structure or a three-section structure, compared with the one-piece structure, the overall structure is still not simple and beautiful enough, and the more sections there are, the more complex the assembly is. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a mechanical pencil movement with an integrated design, a more simple and beautiful structure and very convenient assembly.

[0005] The technical solution of the present utility model is: an automatic pencil core mechanism, which includes a tip sleeve component, a main body component, and a core storage component. The core storage component includes a core storage tube and a connecting part. The connecting part includes an outer tube and a push rod. A first chamber and a second chamber are axially arranged in the outer tube. The core storage tube is installed in the first chamber, and the main body component is installed in the second chamber. The first chamber communicates with the second chamber. One end of the push rod is connected to the core storage tube, and the other end passes through the communication part between the first chamber and the second chamber and is connected to the main body component. A first reset elastic member is further arranged between the first chamber and the core storage tube. The tip sleeve component is embedded in one end of the outer tube close to the main body component. Press the core storage tube, the main body component clamps the lead core and moves towards the tip sleeve component and gradually releases the lead core. Release the core storage tube, and the first reset elastic member drives the core storage tube to drive the main body component to reset and re-clamp the lead core.

[0006] After adopting the above structure, the present utility model has the following advantages:

[0007] In the automatic pencil core mechanism of the present utility model, the main body component is not installed in the tip sleeve component, but in the outer tube of the core storage component. In this way, not only the axial length of the tip sleeve component can be made shorter, but also the main body component and the core storage component are integrated into a whole. Since the axial length of the tip sleeve component is shorter, and it is installed in the end of the outer tube of the core storage component by embedding, its influence on the integrity can be ignored, and it is only integrated into the outer tube as an embedded part at the end of the outer tube. Therefore, the tip sleeve component, the main body component, and the core storage component are all installed in the same outer tube, thus forming an integrated structure, which is more concise and beautiful. During assembly, only the core storage component needs to be installed in the first chamber of the outer tube, the main body component is installed in the second chamber of the outer tube, and finally the tip sleeve component is embedded in one end of the outer tube close to the main body component. The steps are simple and the assembly is very convenient.

[0008] Preferably, an inverted buckle structure is arranged at one end of the push rod close to the core storage tube, and the push rod is installed in the core storage tube through the inverted buckle structure. Connecting the push rod and the core storage tube by the inverted buckle structure not only has a simple structure and is convenient for installation, but also is not easy to separate the core storage tube from the push rod after installation.

[0009] Preferably, the main body component includes a collet sleeve and two collets axially installed in the collet sleeve. One end of each of the two collets close to the push rod is an abutting portion, and the other end is a clamping portion. The push rod extends into the collet sleeve and abuts against the abutting portions of the two collets. A retaining ring is sleeved outside the clamping portions of the two collets. The retaining ring is fixed in the collet sleeve, and the inner diameter of the retaining ring gradually increases in the direction of the tip sleeve component. When the two collets move relative to the collet sleeve towards the tip sleeve component, the two clamping portions radially expand to release the lead core. When the two collets move relative to the collet sleeve away from the tip sleeve component, the two clamping portions radially retract to clamp the lead core. This setting facilitates the use of the cooperation between the push rod and the retaining ring to achieve the opening and retraction of the clamping portions of the collets. Moreover, the position where the retaining ring is located has greater friction compared to other positions of the collet sleeve. After independent design, it is convenient for the repair and replacement of the retaining ring and also convenient to use a more wear-resistant material different from other parts.

[0010] Preferably, ball bearings that are in rolling connection with the retaining ring are further provided outside the clamping portions of the two collets. This setting can reduce the friction between the retaining ring and the clamping portions of the collets.

[0011] Preferably, the push rod and the collet sleeve are connected by a snap structure. When the push rod pushes the collet sleeve against the tip sleeve component, the push rod can be separated from the collet sleeve under the action of an external force. When the external force is removed and the collet sleeve returns to its original position, the push rod can be re-snapped to the collet sleeve under the action of a first return elastic member. This snap structure is convenient for connecting the push rod and the collet sleeve when clamping the lead core is required and also convenient for separating the push rod and the collet sleeve when releasing the lead core is required.

[0012] Preferably, the snap structure includes a first annular protrusion and a second annular protrusion provided on the inner side of the collet sleeve, and a first limiting convex point provided on the outer side of the push rod that can be snapped between the first annular protrusion and the second annular protrusion. This snap structure is simple and easy to connect or separate under the action of an external force.

[0013] Preferably, the abutting portions of the two collets extend into the push rod. A third annular protrusion that can abut against the side of the push rod close to the collets is further provided on the abutting portions of the two collets. A second return elastic member is further provided between the collet sleeve and the two collets to provide a pressing force towards the push rod to the abutting portions of the two collets. Extending the abutting portions of the collets into the push rod and using the second return elastic member to press them tightly can make the connection between the collets and the push rod more reliable. Moreover, the second return elastic member can ensure the reliable return of the two collets.

[0014] Preferably, a guiding hole is provided in the push rod and abuts against the abutting parts of the two clip pieces. The inner diameter of the guiding hole gradually increases in the direction of the tip sleeve component. When the main body component is reset, there is a certain gap between the third annular protrusion and the side of the push rod close to the clip pieces. This setting leaves a certain margin between the third annular protrusion and the side of the push rod close to the clip pieces, which can eliminate the influence of assembly errors and ensure that when reset, the clip pieces can be driven by the second reset elastic member to return to a reliable position, thereby clamping the lead core. Otherwise, if the third annular protrusion directly abuts against the side of the push rod close to the clip pieces, it is difficult to ensure whether the clip pieces return to the correct position due to the lack of adjustment space, and the clamping of the lead core cannot be guaranteed.

[0015] Preferably, a fourth annular protrusion for installing a retaining ring is further provided in the clip sleeve. The second reset elastic member is sleeved outside the two clip pieces, with one end abutting against the third annular protrusion and the other end abutting against the fourth annular protrusion. This setting not only facilitates the installation of the retaining ring using the fourth annular protrusion but also facilitates the installation of the second reset elastic member using the fourth annular protrusion and the third annular protrusion, realizing the reuse of the structure and making the structure of the main body component simpler and more compact.

[0016] Preferably, the tip sleeve component includes a pen tip sleeve, a damping member, and a third reset elastic member. One end of the pen tip sleeve away from the pen tip is embedded in one end of the outer tube close to the main body component. The damping member is installed in the pen tip sleeve and one end extends out of the pen tip of the pen tip sleeve. One end of the third reset elastic member abuts against the pen tip sleeve and the other end abuts against the damping member. This tip sleeve component has a simple structure and a good feel when pressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of an existing automatic pencil movement;

[0018] Figure 2 is a schematic structural diagram of another embodiment of an existing automatic pencil movement;

[0019] Figure 3 is a schematic structural diagram of the automatic pencil movement of the present invention;

[0020] Figure 4 is a side view of the automatic pencil movement of the present invention;

[0021] Figure 5 is Figure 4 a cross-sectional view taken along A-A' in

[0022] Figure 6 is an exploded schematic diagram of the automatic pencil movement of the present invention;

[0023] Figure 7 is a schematic structural diagram of the automatic pencil movement of the present invention with the outer tube and the clip sleeve hidden;

[0024] In the prior art figure: 1a - tip sleeve component, 2a - main body component, 3a - core storage component, 4a - tip sleeve, 5a - movable damper, 6a - damper spring, 7a - lock ring, 8a - clip, 9a - clip spring, 10a - steel ball, 11a - core storage tube, 12a - lead core, 13a - joint, 14a - outer tube, 15a - push rod, 16a - push rod spring;

[0025] In the figure of the present utility model: 1 - tip sleeve component, 2 - main body component, 3 - core storage component, 4 - core storage tube, 5 - outer tube, 6 - push rod, 7 - first chamber, 8 - second chamber, 9 - first reset elastic member, 10 - reverse buckle structure, 11 - clip sleeve, 12 - clip, 13 - abutting portion, 14 - clamping portion, 15 - retaining ring, 16 - lead core, 17 - ball, 18 - first annular protrusion, 19 - second annular protrusion, 20 - first limit bump, 21 - third annular protrusion, 22 - second reset elastic member, 23 - guide hole, 24 - gap, 25 - fourth annular protrusion, 26 - pen tip sleeve, 27 - damper, 28 - third reset elastic member, 29 - hollow portion, 30 - third limit step, 31 - fifth annular protrusion, 32 - first limit step, 33 - second limit step, 34 - damper stop member, 35 - sixth annular protrusion, 36 - fourth limit step, 37 - second limit bump, 38 - pen tip. Detailed implementation manners

[0026] The following further describes the present utility model with reference to the accompanying drawings and embodiments.

[0027] Embodiment:

[0028] As Figure 3-7As shown, a mechanical pencil core comprises a tip sleeve component 1, a main body component 2 and a core storage component 3, the core storage component 3 comprises a core storage tube 4 and a connecting part, the connecting part comprises an outer tube 5 and a push rod 6, a first chamber 7 and a second chamber 8 are arranged in the outer tube 5 along the axial direction, the core storage tube 4 is installed in the first chamber 7, the main body component 2 is installed in the second chamber 8, the first chamber 7 is connected to the second chamber 8, one end of the push rod 6 is connected to the core storage tube 4, and the other end is connected to the main body component 2 through the connecting part between the first chamber 7 and the second chamber 8, and a first chamber 7 is arranged between the first chamber 7 and the core storage tube 4. The reset elastic member 9, in this embodiment, the first reset elastic member 9 is a spring, the first reset elastic member 9 is sleeved outside the push rod 6, one end of the first reset elastic member 9 is against the side of the core storage tube 4 close to the push rod 6, and the other end is against the side of the first chamber 7 close to the second chamber 8, the tip sleeve component 1 is embedded in one end of the outer tube 5 close to the main body component 2, the core storage tube 4 is pressed, the main body component 2 clamps the lead core 16 and moves toward the tip sleeve component 1 and gradually releases the lead core 16, releases the core storage tube 4, and the first reset elastic member 9 drives the core storage tube 4 to drive the main body component 2 to reset and re-clamp the lead core 16.

[0029] The mechanical pencil core of the utility model does not install the main body component 2 in the tip sleeve component 1, but installs the main body component 2 in the outer tube 5 of the core storage component 3, so that not only the axial length of the tip sleeve component 1 can be made shorter, but also the main body component 2 and the core storage component 3 are integrated into a whole; because the axial length of the tip sleeve component 1 is shorter, and it is installed in the end of the outer tube 5 of the core storage component 3 by embedding, its influence on the integrity can be ignored, and it is only integrated into the outer tube 5 as an embedded piece at the end of the outer tube 5, so the tip sleeve component 1, the main body component 2 and the core storage component 3 are all installed in the same outer tube 5, thereby forming an integrated structure, which is more simple and beautiful; when assembling, it is only necessary to install the core storage component 3 in the first chamber 7 of the outer tube 5, the main body component 2 in the second chamber 8 of the outer tube 5, and finally the tip sleeve component 1 is embedded in one end of the outer tube 5 close to the main body component 2, the steps are simple, and the assembly is very convenient.

[0030] The push rod 6 is provided with an undercut structure 10 at one end close to the core storage tube 4, and the push rod 6 is installed in the core storage tube 4 through the undercut structure 10. The undercut structure 10 can be made of the prior art. The undercut structure 10 is used to connect the push rod 6 and the core storage tube 4, which is not only simple in structure and convenient to install, but also difficult to separate the core storage tube 4 from the push rod 6 after installation.

[0031] The main body component 2 includes a collet sleeve 11 and two collets 12 axially installed in the collet sleeve 11. One end of the two collets 12 close to the push rod 6 is an abutting portion 13 and the other end is a clamping portion 14. The push rod 6 extends into the collet sleeve 11 and abuts against the abutting portions 13 of the two collets 12. A retaining ring 15 is sleeved outside the clamping portions 14 of the two collets 12. The retaining ring 15 is fixed in the collet sleeve 11 and the inner diameter of the retaining ring 15 gradually increases in the direction of the tip sleeve component 1. When the two collets 12 move relative to the collet sleeve 11 towards the tip sleeve component 1, the two clamping portions 14 radially expand to release the lead core 16. When the two collets 12 move relative to the collet sleeve 11 away from the tip sleeve component 1, the two clamping portions 14 radially retract to clamp the lead core 16. This setting facilitates the use of the cooperation between the push rod 6 and the retaining ring 15 to achieve the expansion and retraction of the clamping portions 14 of the collets 12. Moreover, the position where the retaining ring 15 is located has greater friction compared to other positions of the collet sleeve 11. After independent design, it is convenient for the maintenance and replacement of the retaining ring 15, and it is also convenient to use a more wear-resistant material different from other parts.

[0032] A ball 17 that is in rolling connection with the retaining ring 15 is further provided outside the clamping portions 14 of the two collets 12. In this embodiment, a semi-circular groove is provided on the outer side wall of the clamping portion 14, and the ball 17 is embedded in the groove and can axially move along with the clamping portion 14 and freely roll in the groove. This setting can reduce the friction between the retaining ring 15 and the clamping portions 14 of the collets 12.

[0033] The push rod 6 and the collet sleeve 11 are connected by a snap structure. When the push rod 6 pushes the collet sleeve 11 to abut against the tip sleeve component 1, the push rod 6 can be separated from the collet sleeve 11 under the action of an external force. When the external force is removed and the collet sleeve 11 is reset, the push rod 6 can be re-snapped with the collet sleeve 11 under the action of the first reset elastic member 9. This snap structure is convenient for connecting the push rod 6 and the collet sleeve 11 when it is necessary to clamp the lead core 16, and is also convenient for separating the push rod 6 and the collet sleeve 11 when it is necessary to release the lead core 16.

[0034] The snap structure includes a first annular protrusion 18 and a second annular protrusion 19 provided on the inner side of the collet sleeve 11, and a first limit bump 20 provided on the outer side of the push rod 6 that can be snapped between the first annular protrusion 18 and the second annular protrusion 19. This snap structure is simple and is easy to connect or separate under the action of an external force.

[0035] Two first limit bumps 20 are provided and are evenly arranged circumferentially along the side wall of the push rod 6. A reasonable number of first limit bumps 20 not only makes the snap connection more reliable, but also does not affect the separation of the snap structure, and the thrust of the push rod 6 can be more stably and reliably transmitted to the collet sleeve 11 and the collets 12.

[0036] A hollowed-out portion 29 is also provided on the side wall of the push rod 6 and located between two first limit bumps 20. This setting can form a certain elasticity in the area where the first limit bumps 20 are located, thereby making it easier to connect and separate the buckle structure.

[0037] The abutting portions 13 of the two clip pieces 12 extend into the push rod 6. A third annular protrusion 21 that can abut against the side of the push rod 6 close to the clip pieces 12 is also provided on the abutting portions 13 of the two clip pieces 12. A second reset elastic member 22 is further provided between the clip sleeve 11 and the two clip pieces 12 for providing a pressing force towards the push rod 6 to the abutting portions 13 of the two clip pieces 12. In this embodiment, the second reset elastic member 22 is a spring. Extending the abutting portions 13 of the clip pieces 12 into the push rod 6 and using the second reset elastic member 22 to press them tightly can make the connection between the clip pieces 12 and the push rod 6 more reliable, and the second reset elastic member 22 can ensure the reliable reset of the two clip pieces 12.

[0038] A guiding hole 23 that abuts against the abutting portions 13 of the two clip pieces 12 is provided in the push rod 6. The inner diameter of the guiding hole 23 gradually increases in the direction towards the tip sleeve component 1. When the main body component 2 is reset, there is a certain gap 24 between the third annular protrusion 21 and the side of the push rod 6 close to the clip pieces 12. This setting leaves a certain margin between the third annular protrusion 21 and the side of the push rod 6 close to the clip pieces 12, which can eliminate the influence of assembly errors and ensure that when resetting, the clip pieces 12 can be driven by the second reset elastic member 22 to return to a reliable position to clamp the lead core 16. Otherwise, if the third annular protrusion 21 directly abuts against the side of the push rod 6 close to the clip pieces 12, due to the lack of adjustment space, it is difficult to ensure whether the clip pieces 12 return to the correct position, and the clamping of the lead core 16 is difficult to guarantee.

[0039] A fourth annular protrusion 25 for installing the retaining ring 15 is further provided in the clip sleeve 11. The second reset elastic member 22 is sleeved outside the two clip pieces 12 and one end abuts against the third annular protrusion 21 while the other end abuts against the fourth annular protrusion 25. This setting not only facilitates the installation of the retaining ring 15 using the fourth annular protrusion 25 but also facilitates the installation of the second reset elastic member 22 using the fourth annular protrusion 25 and the third annular protrusion 21, realizing the reuse of the structure and making the structure of the main body component 2 simpler and more compact.

[0040] The two clip pieces 12 are in clearance fit with the lead core 16 except for the clamping portions 14. This setting can make it easier for the clamping portions 14 to radially expand and retract, as well as for the lead core 16 to exit the core.

[0041] The tip sleeve component 1 includes a tip sleeve 26, a damping member 27, and a third reset elastic member 28. One end of the tip sleeve 26 away from the pen tip 38 is embedded in one end of the outer tube 5 close to the main body component 2. The damping member 27 is installed in the tip sleeve 26 and one end extends outside the pen tip 38 of the tip sleeve 26. One end of the third reset elastic member 28 abuts against the tip sleeve 26 and the other end abuts against the damping member 27. In this embodiment, the third reset elastic member 28 is a spring, and the tip sleeve 26 is snap-connected to the outer tube 5. The structure of the tip sleeve component 1 is simple and has a good feel when pressed.

[0042] A fifth annular protrusion 31 that abuts against the outer tube 5 is provided on the outer side of the tip sleeve 26, which is used to limit the maximum embedding depth of the tip sleeve 26. This setting can ensure the correct installation of the tip sleeve 26 and make it extend a reasonable length for convenient writing.

[0043] A first limiting step 32 that can abut against the clip sleeve 11 and a second limiting step 33 that can abut against the clamping portions 14 of the two clips 12 are provided on the tip sleeve 26. This setting can ensure the reliable movement of the clip sleeve 11 and the clips 12.

[0044] A third limiting step 30 that abuts against the second chamber 8 is further provided on the push rod 6, which is used to limit the push rod 6 from falling off the second chamber 8. This setting can ensure the reliable connection between the push rod 6 and the main body component 2 in the second chamber 8.

[0045] A damping stop member 34 is further provided in the tip sleeve 26. A sixth annular protrusion 35 is provided on the damping member 27. The third reset elastic member 28 is sleeved outside the damping member 27 and one end abuts against one side of the damping stop member 34 while the other end abuts against the sixth annular protrusion 35. The other side of the damping stop member 34 forms the second limiting step 33. This setting not only forms the second limiting step 33 by using the damping stop member 34, but also limits the third reset elastic member 28 by using the damping stop member 34 in cooperation with the sixth annular protrusion 35.

[0046] A fourth limiting step 36 that abuts against one side of the damping stop member 34 close to the pen tip 38 is provided in the tip sleeve 26, and a second limiting bump 37 that abuts against the side of the damping stop member 34 away from the pen tip 38 is further provided in the tip sleeve 26. This setting facilitates the installation of the damping stop member 34 between the second limiting bump 37 and the fourth limiting step 36 of the tip sleeve 26.

[0047] The working principle of the automatic pencil movement of the present utility model is as follows:

[0048] Press the cartridge tube 4, and the cartridge tube 4 drives the push rod 6 to move in the direction of the tip sleeve component 1. The movement of the push rod 6 drives the clip sleeve 11 and the two clips 12 to move together. Since the lead core 16 is clamped in the clamping part 14 of the two clips 12 at this time, the lead core 16 also extends out of the tip sleeve component 1 during the clamping and pushing of the two clips 12. When the clip sleeve 11 abuts against the first limit step 32 of the pen tip sleeve 26, the clip sleeve 11 stops moving. The push rod 6 will be disengaged from the snap connection with the clip sleeve 11 and separated under the action of an external force. At the same time, the push rod 6 abuts against the third annular protrusion 21 on the abutting part 13 of the two clips 12, and continues to push the two clips 12 to move in the direction of the tip sleeve component 1. At this time, the two clips 12 move relative to the clip sleeve 11 in the direction of the tip sleeve component 1, and the clamping parts 14 of the two clips 12 slowly open to release the lead core 16. After the lead core 16 is separated from the two clips 12, it will stay in the damper 27 under the resistance of the damper 27. Release the cartridge tube 4, and the clip sleeve 11 and the push rod 6 will reset and reconnect with a snap under the action of the first reset elastic member 9. At the same time, the clip 12 also resets and reclamps the lead core 16 under the action of the second reset elastic member 22.

Claims

1. A mechanical pencil core, comprising a tip cover component (1), a main body component (2) and a core storage component (3), wherein the core storage component (3) comprises a core storage tube (4) and a connecting part, wherein the connecting part comprises an outer tube (5) and a push rod (6), characterized in that: A first chamber (7) and a second chamber (8) are provided in the outer tube (5) along the axial direction. The core storage tube (4) is installed in the first chamber (7), and the main body (2) is installed in the second chamber (8). The first chamber (7) is connected to the second chamber (8). One end of the push rod (6) is connected to the core storage tube (4), and the other end passes through the connection between the first chamber (7) and the second chamber (8) and is connected to the main body (2). A first resetting elastic member (9) is also provided between the core storage tube (4). The pointed sleeve member (1) is embedded in one end of the outer tube (5) close to the main body member (2). When the core storage tube (4) is pressed, the main body member (2) clamps the lead core (16) and moves toward the pointed sleeve member (1) and gradually releases the lead core (16). The core storage tube (4) is released, and the first resetting elastic member (9) drives the core storage tube (4) to drive the main body member (2) to reset and re-clamp the lead core (16).

2. The automatic pencil core according to claim 1, characterized in that: An undercut structure (10) is provided at one end of the push rod (6) close to the core storage tube (4), and the push rod (6) is installed in the core storage tube (4) via the undercut structure (10).

3. The mechanical pencil core according to claim 1, characterized in that: The main body component (2) comprises a clip sleeve (11) and two clips (12) axially mounted in the clip sleeve (11); one end of the two clips (12) close to the push rod (6) is abutting portion (13) and the other end is a clamping portion (14); the push rod (6) extends into the clip sleeve (11) and abuts against the abutting portions (13) of the two clips (12); and a retaining ring (15) is provided on the outer sleeve of the clamping portions (14) of the two clips (12). The retaining ring (15) is fixedly arranged in the clip sleeve (11) and the inner diameter of the retaining ring (15) gradually increases in the direction where the pointed sleeve component (1) is located; when the two clips (12) move relative to the clip sleeve (11) toward the pointed sleeve component (1), the two clamping parts (14) radially open to release the lead core (16); when the two clips (12) move relative to the clip sleeve (11) away from the pointed sleeve component (1), the two clamping parts (14) radially retract to clamp the lead core (16).

4. The automatic pencil core according to claim 3, characterized in that: A ball (17) which is rollingly connected to the retaining ring (15) is also provided outside the clamping parts (14) of the two clamping pieces (12).

5. The automatic pencil core according to claim 3, characterized in that: The push rod (6) is connected to the clip sleeve (11) via a snap-fit ​​structure. When the push rod (6) pushes the clip sleeve (11) to abut against the tip sleeve component (1), the push rod (6) can be separated from the clip sleeve (11) under the action of an external force. When the external force is removed and the clip sleeve (11) is reset, the push rod (6) can be snap-fitted to the clip sleeve (11) again under the action of the first reset elastic member (9).

6. The mechanical pencil core according to claim 5, characterized in that: The buckle structure comprises a first annular protrusion (18) and a second annular protrusion (19) arranged on the inner side of the clip sleeve (11), and a first limiting protrusion (20) arranged on the outer side of the push rod (6) and capable of being clamped between the first annular protrusion (18) and the second annular protrusion (19).

7. The mechanical pencil core according to claim 3, characterized in that: The abutting portions (13) of the two clips (12) extend into the push rod (6), and the abutting portions (13) of the two clips (12) are also provided with a third annular protrusion (21) that can abut against the side of the push rod (6) close to the clips (12). A second reset elastic member (22) is also provided between the clip sleeve (11) and the two clips (12) for providing a pressing force to the abutting portions (13) of the two clips (12) toward the push rod (6).

8. The mechanical pencil core according to claim 7, characterized in that: The push rod (6) is provided with a guide hole (23) which abuts against the abutting parts (13) of the two clips (12); the inner diameter of the guide hole (23) gradually increases in the direction where the tip sleeve component (1) is located; when the main body component (2) is reset, a certain gap (24) is formed between the third annular protrusion (21) and a side of the push rod (6) close to the clip (12).

9. The automatic pencil core according to claim 7, characterized in that: A fourth annular protrusion (25) for mounting a retaining ring (15) is also provided inside the clip sleeve (11); the second resetting elastic member (22) is sleeved outside the two clips (12) and has one end abutting against the third annular protrusion (21) and the other end abutting against the fourth annular protrusion (25).

10. The mechanical pencil core according to claim 1, characterized in that: The tip cover component (1) comprises a nib cover (26), a damping member (27) and a third resetting elastic member (28); one end of the nib cover (26) away from the nib (38) is embedded in one end of the outer tube (5) close to the main body component (2); the damping member (27) is installed in the nib cover (26) and one end extends out of the nib (38) of the nib cover (26); one end of the third resetting elastic member (28) abuts against the nib cover (26) and the other end abuts against the damping member (27).

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