Propelling pencil

Abstract

The utility model belongs to the technical field of stationery, and particularly relates to a propelling pencil which comprises a pencil shell and a lead outlet device arranged in the pencil shell. The propelling locking device is arranged at the rear end of the pen shell; wherein the propelling locking device is at least provided with an inner pipe fitting arranged in the pen shell, and a stopping part is vertically arranged on the inner side wall of the inner pipe fitting; the rotating part is arranged in the pen shell, the front end of the rotating part movably abuts against the rear end of the inner pipe fitting, and a rotation limiting part is arranged on the inner side wall of the rotating part; the limiting piece is installed at the rear end of the core discharging device, a vertical sliding groove is formed in the outer side wall of the limiting piece, and the sliding groove penetrates through the lower end face of the limiting piece; the front end of the limiting piece is slidably inserted into the rotating piece, and the rotation limiting part is movably arranged in the sliding groove. The sliding groove and the stopping part are staggered by rotating the rotating piece, so that the propelling locking device is locked, the refill discharging device is prevented from being accidentally triggered to discharge the refill out of the pen shell, the operation is simple and convenient, and the use is safe.

Description

Technical Field

[0001] The utility model relates to the technical field of stationery, in particular to a mechanical pencil. Background Art

[0002] A mechanical pencil is a commonly used stationery product. In existing mechanical pencils, the lead can be automatically extended by simply pressing a button at the end of the pen body.

[0003] However, the existing mechanical pencils still have some shortcomings: the mechanical pencil lacks a structure that can lock the lead out. In daily use, the mechanical pencil is accidentally dropped on the ground or squeezed by the outside world after being put into the pencil case, and the button at the end of the pen body is easily pressed accidentally. In this case, the lead will extend out of the pen shaft uncontrollably, thereby dirtying the pencil case, and the lead may even be broken due to extending too long, resulting in the user needing to frequently replace the lead, which increases the cost of use. Summary of the invention

[0004] The utility model aims to provide an automatic pencil, which can prevent the lead from being sent out of the front end of a pen case by rotating a limiter so that the stopper of an inner tube member abuts against the front end of the limiter, thereby preventing a lead-out device from sending the lead out of the pen case, and improving the problem that the lead-out device is easily triggered accidentally to send the lead out of the pen case.

[0005] The purpose of the utility model is achieved in this way:

[0006] A mechanical pencil, comprising:

[0007] Pen case,

[0008] A core ejecting device, which is disposed in the pen housing and is used to eject the core from the front end of the pen housing; and

[0009] A propulsion locking device, which is arranged at the rear end of the pen housing and is used to drive the core ejection device to move in the pen housing;

[0010] Wherein, the propulsion locking device at least has:

[0011] An inner tube member is arranged in the pen housing, and an advance stopper is vertically arranged on the inner side wall of the inner tube member;

[0012] A rotating member is arranged in the pen housing, and the front end of the rotating member movably abuts against the rear end of the inner tube member, and a rotation limiting portion is provided on the inner side wall of the rotating member;

[0013] A stopper is installed at the rear end of the core-discharging device, a vertical sliding groove is provided on the outer side wall of the stopper, and the sliding groove passes through the lower end surface of the stopper; the front end of the stopper is slidably inserted into the rotating member, and the rotation-limiting part is movably placed in the sliding groove;

[0014] When the sliding groove is aligned with the advance-stopping portion, the propulsion locking device is in an unlocked state, and the front end of the limiter can extend into the inner tube;

[0015] When the sliding groove is offset from the advance-stopping portion, the propulsion locking device is in a locked state, and the front end of the limiting member abuts against the advance-stopping portion of the inner tube.

[0016] Preferably, the front end of the rotating member has a gear protrusion, the rear end of the inner tube is provided with at least one gear groove, and the gear protrusion is movably placed in the gear groove;

[0017] The locking and unlocking of the propulsion locking device can be adjusted by adjusting the positions of the gear protrusion and the gear slot.

[0018] Preferably, the front end of the rotating member has a limit block, the rear end of the inner tube is provided with an opening, the limit block is movably placed in the opening, and the side wall of the limit block movably abuts against the side wall of the opening to limit the rotation of the rotating member.

[0019] Preferably, a boss 1 is provided on the inner side of the rotating member, a convex edge is provided on the rear end of the pen shell, and an elastic member 1 is provided between the boss 1 and the convex edge, which is used to make the front end of the rotating member abut against the rear end of the inner tube member, thereby maintaining the locked and unlocked states of the propulsion locking device.

[0020] Preferably, a button is connected to the rear end of the core-discharging device, a convex block is provided on the inner side wall of the button, and a groove 1 is provided on the outer side of the rear end of the limiting member;

[0021] When the button is sleeved on the rear end of the limiting member, the protrusion is engaged in the first groove, so that the button is installed on the limiting member.

[0022] Preferably, a convex strip is provided on the outer side of the inner tube, a second groove is provided on the inner side wall of the pen housing, and the convex strip is snapped into the second groove to limit the rotation of the inner tube in the pen housing.

[0023] Preferably, a convex ring 1 is provided on the inner side wall of the rotating member, and a convex ring 2 is provided on the outer side of the front end of the limiting member, and the convex ring 2 movably abuts against the convex ring 1 to limit the limiting member from separating from the rotating member.

[0024] Preferably, a lap groove and a plurality of annularly distributed holding grooves are provided on the outer side wall of the front end of the pen housing, and anti-slip lines protruding outwards are provided in the holding grooves.

[0025] Preferably, a label slot is provided at the rear end of the pen housing for pasting a label.

[0026] Preferably, the core-out device at least has:

[0027] A stop tube, which is arranged inside the front end of the inner tube, and a second boss is arranged on the inner side wall of the stop tube;

[0028] A core storage tube, which is arranged in the inner tube, and the rear end of the core storage tube is movably connected to the limiting member;

[0029] A clamping jaw member is movably arranged in the inner tube member, and the rear end of the clamping jaw member is connected to the front end of the core storage tube, and the front end of the clamping jaw member is provided with a plurality of circumferentially distributed clamping jaw portions;

[0030] A clamping sleeve, which is sleeved on the outside of the clamping claws, is used to bring the clamping claws closer to each other and clamp the pen core;

[0031] The second elastic member, two ends of which respectively abut against the front end of the core storage tube and the second boss, is used to place the clamping claw portion and the clamping sleeve in the front end of the anti-retraction tube;

[0032] The front end of the pen shell is provided with a pen head, a damping sleeve is provided inside the pen head, and a limiting part is provided inside the pen head;

[0033] When the core storage tube is pushed forward in the inner tube, the front end of the clamping claw and the tightening sleeve extend out of the front end of the anti-retraction tube, thereby sending the pen core in the core storage tube out; when the limiting portion abuts against the tightening sleeve, the clamping claw extends out of the tightening sleeve and releases the pen core, and the damping sleeve fixes the pen core to limit the retraction of the pen core.

[0034] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0035] 1. The push-lock device designed in the utility model can control the lead ejection of the automatic pencil, and the unlocking or locking of the push-lock device is achieved by adjusting whether the sliding groove is aligned with the stop portion; when the push-lock device is unlocked, the lead ejection device can eject the lead out of the pen case; when the push-lock device is locked, the lead ejection device cannot eject the lead; the operation is simple and convenient, and the lead ejection device is prevented from being accidentally triggered to eject the lead out of the pen case, and the use is safe.

[0036] 2. The front end of the rotating member designed in the utility model has a gear protrusion, and the rear end of the inner tube is provided with a gear groove. By placing the gear protrusion in the gear groove, the user can easily confirm whether the propulsion locking device is in an unlocked or locked state, which is more convenient to use.

[0037] 3. The limit block of the rotating part designed in the utility model is movably placed in the opening of the inner pipe part, and the side wall of the limit block movably abuts against the side wall of the opening. The movable range of the limit block in the opening is the rotation range of the rotating part on the inner pipe part, which prevents the rotating part from rotating too much on the inner pipe part, making it difficult for the sliding groove to align with the stop part, thereby improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is one of the structural schematic diagrams of the utility model.

[0039] Figure 2 This is the second structural schematic diagram of the present utility model.

[0040] Figure 3 It is a cross-sectional view of the utility model.

[0041] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0042] Figure 5 It is an exploded view of the utility model.

[0043] Figure 6 It is a structural schematic diagram of the rotating part of the utility model.

[0044] Figure 7 It is a structural schematic diagram of the button of the utility model.

[0045] Figure 8 It is a structural schematic diagram of the inner pipe fitting of the utility model.

[0046] Fig. 9 It is a structural schematic diagram of the pen shell of the utility model.

[0047] Reference numerals: 1, pen housing; 11, convex edge; 12, groove 2; 13, lap groove; 14, grip groove; 15, label groove;

[0048] 2. core-discharging device; 21. stop tube; 211. boss 2; 22. core storage tube; 23. clamping claw; 231. clamping claw; 24. clamping sleeve; 25. elastic member 2;

[0049] 3. Push locking device; 31. Elastic member 1;

[0050] 4. inner pipe; 41. advance stop; 42. gear slot; 43. opening; 44. convex strip;

[0051] 5. Rotating member; 51. Rotation limiting part; 52. Gear position protrusion; 53. Boss one; 54. Limiting block; 55. Protruding ring one;

[0052] 6. Limiting member; 61. Sliding groove; 62. Groove 1; 63. Protruding ring 2;

[0053] 7. Button; 71. Bump;

[0054] 8. Pen tip; 81. Damping sleeve; 82. Limiting part; 9. Pen core. DETAILED DESCRIPTION

[0055] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0056] Specific as Figure 3 As shown, a mechanical pencil comprises: a pen case 1, a lead-out device 2, which is arranged in the pen case 1 and is used to deliver the lead 9 from the front end of the pen case 1; and a propulsion locking device 3, which is arranged at the rear end of the pen case 1 and is used to drive the lead-out device 2 to move in the pen case 1;

[0057] Combination Figures 3 to 8 , wherein the propulsion locking device 3 at least has:

[0058] An inner tube 4 is arranged in the pen housing 1, and a stopper 41 is vertically arranged on the inner side wall of the inner tube 4. In this solution, the stopper 41 is a convex strip, but in practice, a convex block or a convex point can also be used;

[0059] A rotating member 5 is disposed in the pen housing 1, and the front end of the rotating member 5 movably abuts against the rear end of the inner tube 4. The inner side wall of the rotating member 5 has a rotation limiting portion 51, which is a convex strip or a convex block; and

[0060] The limiting member 6 is installed at the rear end of the core discharging device 2. The limiting member 6 is sleeved on the rear end of the core storage tube 22. When the limiting member 6 moves forward, it can drive the core storage tube 22 to move forward so that the core discharging device 2 can send out the pen core 9. A vertical sliding groove 61 is provided on the outer wall of the limiting member 6, and the sliding groove 61 passes through the lower end surface of the limiting member 6; the front end of the limiting member 6 is slidably inserted into the rotating member 5, and the rotation limiting part 51 is movably placed in the sliding groove 61;

[0061] By rotating the stopper 6, the rotating member 5 rotates accordingly, so that the sliding groove 61 is aligned with the stop portion 41. At this time, the push locking device 3 is in an unlocked state. As the stopper 6 moves forward in the pen housing 1, the stop portion 41 slides into the sliding groove 61, so that the front end of the stopper 6 can be extended into the inner tube 4, thereby ensuring that the stopper 6 drives the core storage tube 22 to move forward to extend the pen core 9 out of the front end of the pen housing 1.

[0062] When the sliding groove 61 is offset from the advance stop portion 41, the push-locking device 3 is in a locked state, the advance stop portion 41 cannot slide into the sliding groove 61, and the front end of the limiting member 6 abuts against the advance stop portion 41 of the inner tube member 4, thereby preventing the front end of the limiting member 6 from extending into and moving forward in the inner tube member 4, and preventing the core storage tube 22 from moving forward to extend the pen core 9 out of the front end of the pen housing 1; the push-locking device 3 can be switched between the unlocked and locked states by rotating the limiting member 6, and the operation is simple and quick.

[0063] like Figure 3 As shown, in order to facilitate the assembly of the push locking device 3, the push locking device 3 also has a button 7, the front end of the button 7 is respectively connected to the limit member 6 and the core storage tube 22, the limit member 6 is rotated by rotating the button 7, and the core storage tube 22 is moved forward by pressing the button 7 to enable the core discharge device 2 to deliver the pen core 9.

[0064] Combination Figures 3 to 6 as well as Figure 8 The front end of the rotating member 5 has a gear protrusion 52, and the rear end of the inner tube 4 is provided with at least one gear slot 42, and the gear protrusion 52 is movably placed in the gear slot 42; by adjusting the positions of the gear protrusion 52 and the gear slot 42, the locking and unlocking of the propulsion locking device 3 can be adjusted. The user can determine whether the propulsion locking device 3 is in a locked state by whether the gear protrusion 52 is placed in the gear slot 42, making the use more convenient and significant. In this solution, two gear slots 42 are used, and the user can lock or unlock the propulsion locking device 3 by placing the gear protrusion 52 in different gear slots 42.

[0065] Combination Figure 5 , Figure 6 and Figure 8 The front end of the rotating member 5 has a limit block 54, and the front end of the limit block 54 is formed with the gear protrusion 52 mentioned above. The rear end of the inner tube 4 is provided with an opening 43, and the opening 43 is formed with a gear groove 42. The limit block 54 is movably placed in the opening 43, and the side wall of the limit block 54 movably abuts against the side wall of the opening 43 to limit the rotation of the rotating member 5. The movable range of the limit block 54 in the opening 43 is the rotation range of the rotating member 5. The opening 43 prevents the rotating member 5 from rotating too much, thereby ensuring that the user can quickly align the sliding groove 61 with the stop portion 41, which is more convenient to use.

[0066] Combination Figures 3 to 6A boss 53 is provided on the inner side of the rotating member 5, a convex edge 11 is provided on the rear end of the pen shell 1, and an elastic member 31 is provided between the boss 53 and the convex edge 11. The elastic member 31 is a spring or a disc spring, which is used to make the front end of the rotating member 5 abut against the rear end of the inner tube member 4, and at the same time, the gear protrusion 52 can be placed in the gear groove 42, so as to prevent the rotating member 5 from being able to easily rotate at the rear end of the inner tube member 4, thereby ensuring that the push locking device 3 can maintain a locked or unlocked state.

[0067] Combination Figure 3 , Figure 5 and Figure 7 The inner wall of the button 7 is formed with an annular convex strip, and the outer side of the rear end of the limiting member 6 is formed with an annular groove. The button 7 is sleeved on the rear end of the limiting member 6, and the annular convex strip is engaged in the annular groove, so that the button 7 is installed on the limiting member 6. The inner wall of the button 7 has a protrusion 71, and the outer side of the rear end of the limiting member 6 is provided with a groove 1 62; when the button 7 is sleeved on the rear end of the limiting member 6, the protrusion 71 is engaged in the groove 1 62, so that the limiting member 6 is driven to rotate synchronously when the button 7 rotates.

[0068] Combination Figure 3 , Figure 8 , Fig. 9 A convex strip 44 is provided on the outer side of the inner tube member 4, and a groove 12 is provided on the inner side wall of the pen housing 1. The convex strip 44 is snapped into the groove 12 to limit the rotation of the inner tube member 4 in the pen housing 1 as the rotating member 5 rotates.

[0069] Combination Figures 4 to 6 A convex ring 55 is provided on the inner side wall of the rotating member 5, and a convex ring 63 is provided on the outer side of the front end of the limiting member 6. The convex ring 63 movably abuts against the convex ring 55 to prevent the limiting member 6 from separating from the rotating member 5 under the action of the elastic member 31.

[0070] Combination Figure 1 to Figure 2 A lap groove 13 and a plurality of annularly distributed gripping grooves 14 are provided on the front outer side wall of the pen housing 1. The gripping groove 14 is provided with anti-slip patterns protruding outward. In this scheme, there are two gripping grooves 14. When the user uses the mechanical pencil, the thumb and index finger are placed in different gripping grooves 14 respectively, and the middle finger abuts against the lap groove 13. Through the cooperation of the lap groove 13 and the gripping groove 14, the user's pen-holding posture is corrected.

[0071] like Figure 2 As shown, a label slot 15 is provided at the rear end of the pen housing 1 for pasting a label.

[0072] Combination Figure 2 and Figure 5The core-discharging device 2 comprises: a stop tube 21, which is arranged in the front end of the inner tube 4, and a protrusion is formed on the front end of the inner tube 4, which limits the stop tube 21 from extending out of the front end of the inner tube 4, and a boss 211 is arranged on the inner side wall of the stop tube 21; a core storage tube 22, which is arranged in the inner tube 4, and the rear end of the core storage tube 22 is movably connected to the limiter 6 or the connection button 7; a clamping claw 23, which is movably arranged in the inner tube 4, and the rear end of the clamping claw 23 is inserted into the front end of the core storage tube 22, and the front end of the clamping claw 23 is provided with a plurality of circumferentially distributed clamping claws 231, and there is a contraction space between the clamping claws 231; a clamping sleeve 2 4, which is sleeved on the outside of the clamping claw part 231, and is used to make the clamping claw parts 231 approach each other and shrink the shrinking space to clamp the pen core 9; the second elastic member 25, which is a spring or a disc spring, and the two ends of the second elastic member 25 respectively abut the front end of the core storage tube 22 and the second boss 211, and are used to place the clamping claw part 231 and the clamping sleeve 24 in the front end of the anti-retraction tube 21; the pen core 9, which passes through the core storage tube 22, the clamping claw part 23, the clamping claw part 231, the damping sleeve 81 and the pen tip 8 in sequence; the front end of the pen shell 1 is provided with a pen tip 8, the pen tip 8 is threadedly connected to the front end of the inner tube 4, the pen tip 8 is provided with a damping sleeve 81, and the pen tip 8 has a limiting part 82;

[0073] When the button 7 is pressed, the button 7 pushes the core storage tube 22 to move forward in the inner tube 4, so that the front end of the clamping claw 23 and the tightening sleeve 24 extend out of the front end of the anti-retraction tube 21. At this time, the clamping claw 231 clamps the pen core 9 because it is covered with the tightening sleeve 24, so that the pen core 9 in the core storage tube 22 can be sent out. When the limiting part 82 abuts against the tightening sleeve 24, the clamping claw 231 continues to move forward under the thrust of the button 7 and extends out of the tightening sleeve 24 and releases the pen core 9. The damping sleeve 81 fixes the pen core 9 due to the friction force, so that the pen core 9 extends out of the front end of the pen tip 8. After releasing the button 7, the core storage tube 22 moves backward under the action of the elastic member 25, thereby driving the clamping claw 23 to retract into the anti-retraction tube 21. At this time, the tightening sleeve 24 tightens the clamping claw 231 to fix the pen core 9.

[0074] A through hole is provided on the button 7. When the button 7 is installed at the rear end of the core storage tube 22, the through hole conducts the outside and the inside of the core storage tube 22. The user can put the pen core 9 into the core storage tube 22 through the through hole of the button 7 to replenish the pen core 9, which is convenient to use.

[0075] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A mechanical pencil, characterized in that: include: Pen case (1), A core ejecting device (2), which is arranged in the pen housing (1) and is used to eject the core from the front end of the pen housing (1); as well as A propulsion locking device (3) is arranged at the rear end of the pen housing (1) and is used to drive the core ejection device (2) to move inside the pen housing (1); Wherein, the propulsion locking device (3) at least comprises: An inner tube member (4) is arranged in the pen housing (1), and a stopper (41) is vertically arranged on the inner side wall of the inner tube member (4); A rotating member (5) is arranged in the pen housing (1), and the front end of the rotating member (5) movably abuts against the rear end of the inner tube member (4), and a rotation-limiting portion (51) is provided on the inner side wall of the rotating member (5); A limiting member (6) is mounted at the rear end of the core-discharging device (2); a vertical sliding groove (61) is provided on the outer side wall of the limiting member (6), and the sliding groove (61) penetrates the lower end surface of the limiting member (6); the front end of the limiting member (6) is slidably inserted into the rotating member (5), and the rotation-limiting portion (51) is movably placed in the sliding groove (61); When the sliding groove (61) is aligned with the stop portion (41), the propulsion locking device (3) is in an unlocked state, and the front end of the limiting member (6) can extend into the inner tube member (4); When the sliding groove (61) is offset from the advance stop portion (41), the propulsion locking device (3) is in a locked state, and the front end of the limit member (6) abuts against the advance stop portion (41) of the inner tube member (4).

2. A mechanical pencil according to claim 1, characterized in that: The front end of the rotating member (5) is provided with a gear protrusion (52), and the rear end of the inner tube member (4) is provided with at least one gear groove (42), and the gear protrusion (52) is movably placed in the gear groove (42); By adjusting the positions of the gear protrusion (52) and the gear groove (42), the locking and unlocking of the propulsion locking device (3) can be adjusted.

3. A mechanical pencil according to claim 2, characterized in that: The front end of the rotating member (5) is provided with a limit block (54), the rear end of the inner tube member (4) is provided with an opening (43), the limit block (54) is movably disposed in the opening (43), and the side wall of the limit block (54) movably abuts against the side wall of the opening (43) to limit the rotation of the rotating member (5).

4. A mechanical pencil according to any one of claims 1 to 3, characterized in that: A boss (53) is provided on the inner side of the rotating member (5), a convex edge (11) is provided on the rear end of the pen housing (1), and an elastic member (31) is provided between the boss (53) and the convex edge (11) for making the front end of the rotating member (5) abut against the rear end of the inner tube member (4), thereby maintaining the locked and unlocked state of the propulsion locking device (3).

5. A mechanical pencil according to claim 4, characterized in that: The rear end of the core-discharging device (2) is connected to a button (7), the inner side wall of the button (7) is provided with a convex block (71), and the outer side of the rear end of the limiting member (6) is provided with a groove 1 (62); When the button (7) is sleeved on the rear end of the limiting member (6), the protrusion (71) is engaged in the groove 1 (62), thereby achieving the installation of the button (7) on the limiting member (6).

6. A mechanical pencil according to claim 5, characterized in that: The outer side of the inner tube (4) is provided with a convex strip (44), the inner side wall of the pen housing (1) is provided with a second groove (12), and the convex strip (44) is snap-fitted into the second groove (12) to limit the rotation of the inner tube (4) in the pen housing (1).

7. A mechanical pencil according to claim 4, characterized in that: A convex ring 1 (55) is provided on the inner side wall of the rotating member (5), and a convex ring 2 (63) is provided on the outer side of the front end of the limiting member (6). The convex ring 2 (63) movably abuts against the convex ring 1 (55) to limit the limiting member (6) from separating from the rotating member (5).

8. A mechanical pencil according to claim 1 or 2 or 3 or 5 or 6 or 7, characterized in that: The front end outer wall of the pen housing (1) is provided with an overlapping groove (13) and a plurality of annularly distributed holding grooves (14), and the holding grooves (14) are provided with anti-slip patterns protruding outwards.

9. A mechanical pencil according to claim 8, characterized in that: The rear end of the pen housing (1) is provided with a label slot (15) for pasting a label.

10. A mechanical pencil according to claim 1 or 2 or 3 or 5 or 6 or 7 or 9, characterized in that: The core-discharging device (2) at least comprises: A stop tube (21) is arranged inside the front end of the inner tube (4), and a second boss (211) is arranged on the inner side wall of the stop tube (21); A core storage tube (22) is arranged in the inner tube (4), and the rear end of the core storage tube (22) is movably connected to the limiting member (6); A clamping jaw member (23) is movably arranged in the inner tube member (4), and the rear end of the clamping jaw member (23) is connected to the front end of the core storage tube (22), and the front end of the clamping jaw member (23) is provided with a plurality of circumferentially distributed clamping jaw portions (231); A clamping sleeve (24) is sleeved on the outside of the clamping claw portion (231) and is used to bring the clamping claw portions (231) closer to each other and clamp the pen core; The second elastic member (25) has two ends respectively abutting against the front end of the core storage tube (22) and the second boss (211), and is used to place the clamping claw portion (231) and the clamping sleeve (24) inside the front end of the anti-retraction tube (21); The front end of the pen housing (1) is provided with a pen head (8), a damping sleeve (81) is provided inside the pen head (8), and a limiting portion (82) is provided inside the pen head (8); When the core storage tube (22) is pushed forward in the inner tube (4), the front end of the clamping claw (23) and the tightening sleeve (24) extend out of the front end of the anti-retraction tube (21), thereby delivering the pen core in the core storage tube (22); when the limiting portion (82) abuts against the tightening sleeve (24), the clamping claw (231) extends out of the tightening sleeve (24) and releases the pen core, and the damping sleeve (81) fixes the pen core, thereby limiting the retraction of the pen core.

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