A marker
By incorporating an elastic partition and a threaded sealing cap within the marker's ink reservoir, the problems of ink splattering and foam overflow during refilling are resolved, resulting in a better user experience and greater ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN THOUSANDSHORES TECH CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-07
AI Technical Summary
Existing markers are prone to ink splattering and overflowing during the ink refilling process due to factors such as disassembly inertia and grip angle, as well as foam overflowing.
A partition is installed inside the ink reservoir of the marker. The partition has a filling hole in the center. The partition is made of elastic material and is designed with multiple lobes or a spiral shape. It is connected to the sealing cap by threads. When the sealing cap is removed, the partition forms a barrier to prevent ink splashing and air bubbles from overflowing.
It effectively prevents ink splashing and foam overflow, improves the user experience during the ink filling process, and has a simple structure and is easy to operate.
Smart Images
Figure CN224465537U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of marker technology, and in particular to a marker pen. Background Technology
[0002] Markers are a widely used art tool in painting, hand-drawing, doodling, and other fields. Acrylic markers with a direct-liquid structure have a hollow ink reservoir, where all the ink is stored. Writing is achieved through direct contact between the ink and the pen tip. Marker ink is water-based; due to its ink properties, ink or water can be added as needed to achieve different effects.
[0003] In the prior art, see CN222845624U, which discloses a direct-liquid acrylic marker. The marker usually has a cap at the end for easy removal by the user to refill the ink. The problem with the prior art is that when the user opens the cap to prepare to refill the ink, the ink inside the marker is prone to splashing or flowing out due to the inertia of disassembly, the angle of holding the pen, etc., and foam overflows when refilling the ink.
[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content
[0005] To address the problems in existing technologies where ink splashes or overflows from the ink chamber due to inertia or grip angle when users refill markers, this invention proposes an elastic valve ink-filling marker.
[0006] This utility model is achieved through the following technical solution:
[0007] A marker pen, wherein the marker pen comprises:
[0008] The pen casing has an ink storage cavity inside, a connecting part at one end of the pen casing, a partition near the connecting part in the ink storage cavity, and a filling hole through the center of the partition.
[0009] A sealing cap is detachably and tightly fitted onto the connecting part.
[0010] The marker pen wherein the side of the partition is fixedly connected to the inner wall of the ink storage cavity around the periphery, and the middle part of the partition is recessed away from the sealing cap along a predetermined arc or a certain taper.
[0011] The partition is provided with a plurality of partition grooves, and the plurality of partition grooves are hollowed out corresponding to the injection hole. The partition is an elastic partition.
[0012] The marker pen described herein includes a plurality of dividing grooves arranged in a circular array on the septum, and several dividing grooves intersecting with the filling hole to uniformly divide the septum into several lobes.
[0013] The marker pen described herein includes two dividing grooves, which are arranged along the center line of the septum and intersect with the filling hole. The dividing grooves divide the septum into a symmetrical first petal and a second petal.
[0014] The marker pen described herein includes a dividing groove, which is spirally arranged on the partition. One end of the dividing groove is connected to the filling hole, and the other end is located at a position corresponding to the inner wall of the ink storage cavity.
[0015] The marker pen wherein the spacer is integrally formed with the pen shell; and / or the thickness of the spacer is between 0.25 mm and 0.3 mm.
[0016] The marker pen, wherein the connecting part is a continuously arranged first thread, and the inner side of the sealing cap is provided with a second thread adapted to the first thread, and the sealing cap is threadedly and tightly connected to the connecting part;
[0017] The end of the sealing cap is provided with an adjustment groove, which runs through both sides of the sealing cap in a straight line.
[0018] The marker pen, wherein the end of the sealing cap is provided with several grooves;
[0019] And / or, the outer circumference of the sealing cap is provided with several anti-slip protrusions.
[0020] The marker pen, wherein a pen tip assembly is provided at the other end of the pen shell, and the pen tip assembly is tightly fitted and connected to the pen shell;
[0021] The pen tip assembly is detachably provided with a pen cap, which includes an anti-roll bar, the length and width of which are adapted to the length and width of the adjustment groove.
[0022] The marker pen, wherein the pen tip assembly includes a mounting base and a pen refill, one end of the mounting base is tightly fitted inside the pen shell, and an ink control rod is provided inside the mounting base, the ink control rod corresponding to the ink storage cavity; the pen refill is disposed on the other end of the mounting base, and the pen refill is connected to the ink control rod;
[0023] The pen cap includes a sleeve and a cap body. The anti-roll bar is integrally formed on the sleeve and the sleeve is detachably fitted onto the mounting base. The sleeve includes a mounting ring at one end, and the cap body is engaged with the mounting ring.
[0024] The beneficial effects of this utility model are as follows: By setting a partition near the connection part in the ink storage cavity of the pen shell, and setting a filling hole in the center of the partition, the partition can seal the original ink in the ink storage cavity when the user removes the sealing cap, thereby preventing ink splashing and leakage. When adding ink through the filling hole, the partition can block the air bubbles generated by the ink, thereby preventing foam overflow. This utility model has a simple structure and significant effect, which can effectively improve the user experience of the marker ink filling process. Attached Figure Description
[0025] Figure 1 This is an exploded view of the structure of the marker pen of this utility model;
[0026] Figure 2 This is a three-dimensional structural diagram of the marker pen of this utility model;
[0027] Figure 3 This is a cross-sectional view of the marker pen of this utility model;
[0028] Figure 4 This is a schematic diagram of the first embodiment of the anti-overflow component in the marker pen of this utility model;
[0029] Figure 5 This is a schematic diagram of the second embodiment of the anti-overflow component in the marker pen of this utility model;
[0030] Figure 6 This is a schematic diagram of the third embodiment of the anti-overflow component in the marker pen of this utility model.
[0031] exist Figures 1 to 6 In the middle: 100, pen shell; 101, ink reservoir; 110, connecting part; 111, first thread; 120, partition; 121, filling hole; 122, dividing groove; 123, leaf blade; 124, first leaf body; 125, second leaf body; 200, sealing cap; 210, second thread; 220, adjusting groove; 230, swivel groove; 240, anti-slip tenon; 300, pen tip assembly; 310, mounting base; 311, ink control lever; 320, pen refill; 400, pen cap; 410, anti-roll bar; 420, sleeve body; 430, mounting ring; 440, cap body. Detailed Implementation
[0032] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0035] In the prior art, see CN222845624U, which discloses a direct-liquid acrylic marker. The marker usually has a cap at the end for easy removal by the user to refill the ink. The problem with the prior art is that when the user opens the cap to prepare to refill the ink, the ink inside the marker is prone to splashing or flowing out due to the inertia of disassembly, the angle of holding the pen, etc., and foam overflows when refilling the ink.
[0036] Based on the aforementioned problems in the prior art, this utility model provides an elastic flap ink-filling marker, such as... Figure 1 and Figure 3 As shown, the elastic flap ink-filling marker includes: a pen shell 100, an ink storage chamber 101 inside the pen shell 100, a connecting part 110 at one end of the pen shell 100, a partition 120 in the ink storage chamber 101 near the connecting part 110, and a filling hole 121 through the center of the partition 120; and a sealing cap 200, which is detachably and tightly fitted onto the connecting part 110.
[0037] This invention features a partition 120 located near the connecting part 110 within the ink storage cavity 101 of the pen casing 100. The partition 120 has a filling hole 121 at its center. When the user removes the sealing cap 200, the partition 120 seals off the existing ink in the ink storage cavity 101, preventing ink splashing and leakage. When adding ink through the filling hole 121, the partition 120 blocks air bubbles generated by the ink, preventing foam overflow. This invention has a simple structure, significant effects, and effectively improves the user experience of adding ink to a marker.
[0038] In the above embodiments, such as Figure 1 and Figure 3 As shown, the main body of the marker pen includes a pen shell 100 and a sealing cap 200. The pen shell 100 has an ink storage chamber 101 inside, which is used to store ink during actual use to meet the user's need for continuous writing. One end of the pen shell 100 is used to replenish ink to the ink storage chamber 101. Therefore, a connecting part 110 is provided at one end of the pen shell 100. The connecting part 110 has an inner hole in the center, which is connected to the ink storage chamber 101. During actual use, the connecting part 110 is used to connect with the sealing cap 200 to form a detachable seal for the ink storage chamber 101.
[0039] In this embodiment, to prevent ink from splashing or leaking out of the marker pen due to disassembly inertia or grip angle when the user removes the sealing cap 200, a partition 120 is provided in the ink storage cavity 101 near the connecting part 110. This creates a certain distance between the partition 120 and the end outside the connecting part 110, allowing the user to observe the situation when refilling ink. In the prior art, refilling ink into the marker pen is achieved by inserting a dropper-like device into the pen shell 100. Therefore, in this application, a filling hole 121 is also provided at the center of the partition 120. The filling hole 121 is through-hole, providing space for refilling ink. The sealing cap 200 is detachably and tightly fitted onto the connecting part 110. When the sealing cap 200 is connected to the connecting part 110, it can shield the partition 120 and the filling hole 121, and seal the pen shell 100, thereby preventing ink leakage when the user uses the marker pen.
[0040] In one specific implementation method, such as Figure 1 and Figure 3 As shown, the side of the partition 120 is fixedly connected to the inner wall of the pen shell 100 around the periphery. The middle part of the partition 120 is recessed along a predetermined arc towards the side away from the sealing cap 200. The recessed shape of the partition 120 helps the ink to enter the ink storage chamber 101 more smoothly through the filling hole 121 during the ink filling process, reducing the generation of air bubbles. At the same time, it can also have a better blocking effect on the ink in the ink storage chamber 101 to prevent foam from overflowing during ink filling.
[0041] Furthermore, the material of the spacer 120 is preferably a material with a certain degree of elasticity, such as rubber or silicone, to ensure that the spacer 120 can deform under external force and achieve a rapid reset effect. Specifically, such as Figure 3 As shown, the middle part of the aforementioned partition 120 can be specifically set along a predetermined arc to cooperate with the ink injector in the prior art to achieve the effect of deformation. In another possible embodiment, the middle part of the partition 120 can also be set along a certain taper, which can also achieve the effect of deformation in cooperation with the ink injector.
[0042] Specifically, such as Figure 1 and Figure 3 As shown, to facilitate the deformation of the partition 120 and make way for the ink injector, several partition grooves 122 are provided on the partition 120 in this embodiment. The partition grooves 122 are hollowed out on the partition 120 corresponding to the filling hole 121, so that the partition 120 can be divided into a predetermined shape. The partition grooves 122 enable the partition 120 to deform more smoothly when under force, so as to make way for the ink injector. When the partition 120 is in a non-stressed state, it forms a predetermined state under the action of its own elasticity. This predetermined state forms a seal on the inner hole of the connecting part 110. Therefore, when the user removes the sealing cap 200, it can effectively prevent ink from splashing or flowing out.
[0043] In the first embodiment of this utility model, as Figure 4 As shown, in this embodiment, the shape of the partition 120 can be set along a predetermined arc. Correspondingly, multiple partition grooves 122 can be specifically provided. The multiple partition grooves 122 are arranged in a circular array on the partition 120. Several partition grooves 122 are intersecting with the filling hole 121, thereby uniformly dividing the partition 120 into several lobes 123. The arrangement of the lobes 123 allows the partition 120 to deform more smoothly and uniformly when subjected to the external force of the ink injector insertion, providing sufficient clearance for the ink injector and ensuring that the ink can be smoothly injected into the ink storage cavity 101. At the same time, the design of the lobes 123 also enhances the sealing effect of the partition 120 on the ink storage cavity 101, effectively preventing ink splashing and foam overflow.
[0044] In the second embodiment of this utility model, as Figure 5 As shown, in this embodiment, the shape of the partition 120 can be set along a certain taper. Correspondingly, two partition grooves 122 can be specifically provided. The two partition grooves 122 are arranged along the center line of the partition 120 and intersect with the filling hole 121. The partition grooves 122 divide the partition 120 into symmetrical first petals 124 and second petals 125. The design of the first petals 124 and second petals 125 allows the partition 120 to open smoothly along the direction of the partition grooves 122 when subjected to external force, providing a channel for the ink injector. At the same time, due to the symmetry of the petals, the partition 120 can maintain a uniform sealing effect when reset, ensuring the sealing effect of the ink storage cavity 101. This design simplifies the structure of the partition 120 and improves its practicality.
[0045] In the third embodiment of this utility model, as Figure 6As shown, in this embodiment, the shape of the partition 120 can be set along a certain taper. Correspondingly, a dividing groove 122 can be set, which is spirally arranged on the partition 120. One end of the dividing groove 122 is connected to the filling hole 121, and the other end is located at the position of the inner wall of the corresponding connecting part 110. The spiral dividing groove 122 design allows the partition 120 to gradually open along the spiral direction when subjected to external force, providing a smoother channel for the ink dispenser. This design not only enhances the deformation capability of the partition 120, but also improves the sealing effect of the partition 120 on the ink storage cavity 101, ensuring that ink will not splash or foam overflow during the ink filling process.
[0046] In another possible embodiment of this utility model, such as Figure 3 As shown, to achieve a detachable connection between the connecting part 110 and the sealing cap 200, in this embodiment, a first thread 111 is continuously provided on the outer side of the connecting part 110. Correspondingly, a second thread 210 adapted to the first thread 111 is provided on the inner side of the sealing cap 200. The sealing cap 200 is threadedly and tightly connected to the first thread 111 of the connecting part 110 through the second thread 210, thereby sealing the ink storage chamber 101. When the user needs to add ink, the sealing cap 200 can be rotated counterclockwise to separate it from the connecting part 110, thereby exposing the partition 120 and the filling hole 121. At this time, the user can insert the ink injector into the filling hole 121 to inject ink into the ink storage chamber 101. During the ink injection process, the partition 120 is deformed by the pressure of the ink injector, allowing the ink to smoothly enter the ink storage chamber 101. After ink filling is complete, the user pulls out the ink dispenser. The spacer 120 quickly returns to its original position due to its elasticity, resealing the inner hole of the connection part 110 to prevent ink leakage. At the same time, because the spacer 120 is provided with a dividing groove 122, the spacer 120 can move more smoothly during deformation, improving the convenience and efficiency of ink filling.
[0047] To facilitate the user in opening the sealing cap 200, such as Figure 2 and Figure 3 As shown, an adjustment groove 220 can be provided at the end of the sealing cap 200. The adjustment groove 220 allows the user to rotate the sealing cap 200 with a tool, enabling easy removal even if the sealing cap 200 is installed too tightly. The adjustment groove 220 runs in a straight line through both sides of the sealing cap 200, facilitating tool insertion and providing sufficient rotational torque. In addition, the design of the adjustment groove 220 also enhances the aesthetics of the sealing cap 200.
[0048] In other possible embodiments, the end of the sealing cap 200 may also be provided with several grooves 230, allowing a user to engage with a claw-like tool to drive the sealing cap 200 to rotate, enabling the sealing cap 200 to be easily disassembled even if it is installed too tightly. On the other hand, several anti-slip tenons 240 may be provided around the outer side of the sealing cap 200 to increase the friction between the sealing cap 200 and the hand, preventing slippage when rotating the sealing cap 200 and improving the convenience and stability of operation. In this embodiment, the various structures for opening the sealing cap 200 described above can be provided individually, in pairs, or all at once, to meet the usage needs and habits of different users.
[0049] In the above embodiment, in addition to the pen shell 100 and sealing cap 200, the marker pen is also provided with a pen tip assembly 300 at the other end of the pen shell 100 for providing writing function. The pen tip assembly 300 is tightly fitted and connected to the pen shell 100, thereby forming a correspondence with the ink storage cavity 101 and sealing the ink storage cavity 101.
[0050] With the aforementioned adjustment groove 220 provided on the sealing cap 200, to improve the overall stability and ease of use of the marker, such as Figure 1 and Figure 3 As shown, a pen cap 400 can also be detachably mounted on the pen tip assembly 300 in this utility model. The pen cap 400 includes an anti-roll bar 410, the length and width of which are adapted to the length and width of the adjustment groove 220. In actual use, the anti-roll bar 410 in the pen cap 400 not only prevents the marker from rolling, but also cooperates with the adjustment groove 220. Thus, if the sealing cap 200 is installed too tightly and the user cannot remove it by twisting it with their fingers, the anti-roll bar 410 on the pen cap 400 can be used to twist the sealing cap 200, allowing the user to quickly open the sealing cap 200 without finding other tools.
[0051] In the above embodiments, such as Figure 1 and Figure 3As shown, the pen tip assembly 300 may include a mounting base 310 and a pen refill 320. One end of the mounting base 310 is tightly fitted inside the pen housing 100. An ink control lever 311 is disposed inside the mounting base 310, corresponding to the ink reservoir 101 to ensure smooth ink flow from the reservoir 101 to the pen refill 320. The pen refill 320 is disposed on the other end of the mounting base 310 and connected to the ink control lever 311, thereby achieving a continuous ink supply. The pen cap 400 is detachably fitted onto the mounting base 310, thereby preventing the marker from accidentally falling due to rolling. Specifically, in order to fit the pen cap 400 onto the mounting base 310, the pen cap 400 includes not only the anti-roll bar 410 but also a sleeve 420. The sleeve 420 and the anti-roll bar 410 are integrally formed. The sleeve 420 can be detachably fitted onto the mounting base 310, thereby making it easy for the user to remove the pen cap 400 and install it onto the mounting base 310.
[0052] Furthermore, such as Figure 1 and Figure 3 As shown, the pen cap 400 also includes a cap body 440, which protects the pen refill 320 from external contamination or damage when not in use. The cap body 420 also includes a mounting ring 430 at one end. The cap body 440 engages with the mounting ring 430. When the user needs to write with the marker, the entire assembly of the pen cap 400 can be removed, exposing the writing end of the pen refill 320, thus enabling writing. After writing, the pen cap 400 can be reattached to protect the pen refill 320. In one embodiment, the mounting ring 430 can be simultaneously removed when the pen cap 400 is disassembled, making the cap body 420 and the anti-roll bar 410 independent components, facilitating user grip and use.
[0053] In one specific embodiment of this utility model, the aforementioned partition and pen shell are integrally molded to ensure the structural strength of the partition and the accuracy of its repositioning. The partition can be made of semi-rigid plastic, and its thickness is specifically set to 0.25mm to 0.3mm. With the partition set at the above thickness, it has better flexibility and can achieve a spring-back effect after slight deformation and bending, thus fulfilling the functional effects of sealing the ink storage cavity 101 and making way for existing ink injectors in the marker of this utility model.
[0054] Based on the above embodiments, the actual assembly process of this utility model marker is as follows:
[0055] First, install the ink control lever 311 into the mounting base 310, ensuring that the ink control lever 311 corresponds to the ink reservoir 101 so that ink can flow smoothly from the ink reservoir 101 to the refill 320. Next, install the refill 320 onto the other end of the mounting base 310, connecting the refill 320 to the ink control lever 311 to ensure a continuous ink supply. Then, combine the sleeve 420 with the cap 440 via the mounting ring 430 to form a complete pen cap 400, and fit the pen cap 400 onto the mounting base 310 to protect the refill 320.
[0056] After assembly, the user can write by holding the pen case 100 or the pen cap 400. When the user needs to refill ink, the sealing cap 200 can be rotated counterclockwise to separate it from the connecting part 110, exposing the partition 120 and the filling hole 121. At this time, the user can insert the ink injector into the filling hole 121 to inject ink into the ink storage chamber 101. During the ink filling process, the partition 120 is deformed by the pressure of the ink injector, allowing the ink to smoothly enter the ink storage chamber 101. After the ink filling is completed, the user pulls out the ink injector, and the partition 120 quickly returns to its original position under its own elasticity, resealing the inner hole of the connecting part 110 to prevent ink leakage.
[0057] Furthermore, if the sealing cap 200 is too tight and cannot be removed by hand, the anti-roll bar 410 on the pen cap 400 can be used to twist the sealing cap 200, thus allowing for quick opening of the sealing cap 200 without the need for other tools. This design not only improves the ease of use of the elastic spacer 120 ink-refilling marker but also enhances its practicality.
[0058] In summary, this utility model provides a marker pen comprising: a pen shell, an ink reservoir cavity inside the pen shell, a connecting portion at one end of the pen shell, a partition located near the connecting portion within the ink reservoir cavity, and a filling hole penetrating through the center of the partition; and a sealing cap, which is detachably and tightly fitted onto the connecting portion. This utility model, by placing a partition near the connecting portion within the ink reservoir cavity of the pen shell, and having a filling hole at the center of the partition, allows the partition to seal the existing ink in the ink reservoir cavity when the user removes the sealing cap, thus preventing ink splashing and leakage. When adding ink through the filling hole, the partition also blocks air bubbles generated by the ink, preventing foam overflow. This utility model has a simple structure, significant effects, and effectively improves the user experience of adding ink to the marker pen.
[0059] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A marker pen, characterized in that, The marker pen includes: The pen casing has an ink storage cavity inside, a connecting part at one end of the pen casing, a partition near the connecting part in the ink storage cavity, and a filling hole through the center of the partition. A sealing cap is detachably and tightly fitted onto the connecting part.
2. The marker pen according to claim 1, characterized in that, The side of the partition is fixedly connected to the inner wall of the ink storage cavity around the periphery, and the middle part of the partition is recessed away from the sealing cap along a predetermined arc or a certain taper. The partition is provided with a plurality of partition grooves, and the plurality of partition grooves are hollowed out corresponding to the injection hole. The partition is an elastic partition.
3. The marker pen according to claim 2, characterized in that, The partition groove is provided in a plurality of ways, and the plurality of partition grooves are arranged in a ring array on the partition. Several of the partition grooves are arranged to intersect with the injection hole to uniformly divide the partition into several lobes.
4. The marker pen according to claim 2, characterized in that, The partition groove is provided in two parts, which are arranged along the center line of the partition and intersect with the injection hole. The partition groove divides the partition into a symmetrical first petal and a second petal.
5. The marker pen according to claim 2, characterized in that, The partition groove is provided in one way. The partition groove is spirally arranged on the partition plate. One end of the partition groove is connected to the filling hole, and the other end is located at the position corresponding to the inner wall of the ink storage cavity.
6. The marker pen according to claim 2, characterized in that, The partition is integrally formed with the pen shell; and / or, the thickness of the partition is between 0.25 mm and 0.3 mm.
7. The marker according to claim 1, characterized in that, The connecting part has a continuously arranged first thread, and the inner side of the sealing cap has a second thread that is adapted to the first thread. The sealing cap and the connecting part are threadedly and tightly connected. The end of the sealing cap is provided with an adjustment groove, which runs through both sides of the sealing cap in a straight line.
8. The marker according to claim 7, characterized in that, The end of the sealing cap is provided with several grooves; And / or, the outer circumference of the sealing cap is provided with several anti-slip protrusions.
9. The marker according to claim 7, characterized in that, The other end of the pen casing is provided with a pen tip assembly, which is tightly fitted and connected to the pen casing. The pen tip assembly is detachably provided with a pen cap, which includes an anti-roll bar, the length and width of which are adapted to the length and width of the adjustment groove.
10. The marker according to claim 9, characterized in that, The pen tip assembly includes a mounting base and a pen refill. One end of the mounting base is tightly fitted inside the pen shell, and an ink control rod is provided inside the mounting base, which corresponds to the ink storage cavity. The pen refill is disposed on the other end of the mounting base and is connected to the ink control rod. The pen cap includes a sleeve and a cap body. The anti-roll bar is integrally formed on the sleeve and the sleeve is detachably fitted onto the mounting base. The sleeve includes a mounting ring at one end, and the cap body is engaged with the mounting ring.