Combined ink bag writing pen

Abstract

The utility model discloses a combined type ink bag writing pen which comprises a pen body, a pen point assembly and a plurality of ink bags, a containing cavity is formed in the pen body, the pen point assembly is arranged at one end of the pen body, the ink bags are all contained in the containing cavity, end covers of the ink bags are provided with convex portions, the tail portions of the ink bags are provided with concave portions, and the concave portions are arranged on the pen point assembly. Every two adjacent ink bags are matched in an inserted mode through the corresponding convex part and the corresponding concave part, each convex part is provided with a first ferromagnetic component, each concave part is provided with a second ferromagnetic component, so that the convex parts and the concave parts of every two adjacent ink bags are connected in a magnetic attraction mode through the magnetic attraction force between the first ferromagnetic components and the second ferromagnetic components, and the multiple ink bags are sequentially connected together in a magnetic attraction mode. According to the ink bag combination structure, shaking and abnormal noise caused by the fact that the multiple ink bags are separated and directly placed in the containing cavity are avoided, the user experience feeling is good, the two adjacent ink bags are connected in a magnetic attraction inserting mode, the ink bag replacement process is easy, convenient and rapid, use and combination assembly are convenient, the ink bag combination structure is simple, and the machining technology difficulty and the manufacturing cost are low.

Description

Technical Field

[0001] This utility model relates to the field of writing pen technology, and in particular to a combined ink cartridge writing pen. Background Technology

[0002] Writing pens are widely used writing tools. Modern writing pens include fountain pens, direct-liquid pens, and scientific brushes. The ink in writing pens is generally refillable, with an ink converter inside the pen barrel drawing ink. However, this ink-filling device or system takes up a significant amount of space inside the pen, resulting in a small ink capacity and causing inconvenience to the user. In some usage scenarios, such as when traveling or writing with a very wide nib, users prefer to use pure ink cartridges without an ink-filling device to increase the pen's writing capacity and may need to store multiple ink cartridges inside the pen barrel. Single extra-large capacity ink cartridges have poor compatibility, and when ink is consumed in large quantities, the large amount of air trapped inside the cartridge can negatively impact the ink delivery performance due to thermal expansion and contraction. Furthermore, to prevent ink from leaking due to abnormal air pressure during travel, users also need to completely isolate the ink from the nib's ink supply system. Currently, most ink cartridges on the market are disposable, so the lack of a cartridge cap means that opened cartridges cannot be completely isolated. Furthermore, if multiple ink cartridges are stored inside the pen barrel simultaneously, unsecured cartridges will shift due to the internal dimensional allowance, causing noise and frequent shifts in the writing center of gravity. Existing ink cartridge securing methods use additional cartridge holders, thus occupying more radial space in the pen body and increasing overall weight. Moreover, the cartridge holders must be matched and manufactured according to specific pen barrel dimensions and ink cartridge sizes, resulting in poor flexibility and versatility in this securing method. Utility Model Content

[0003] The purpose of this invention is to provide a combined ink cartridge writing pen, which aims to solve at least one of the technical problems existing in the prior art.

[0004] To achieve the above objectives, this utility model provides a combined ink cartridge writing pen, which includes:

[0005] The pen body has an internal cavity.

[0006] A pen tip assembly, wherein the pen tip assembly is disposed at one end of the pen body;

[0007] Multiple ink sacs are housed within the receiving cavity. One of the end caps and the tail of each ink sac has a protrusion, and the other of the end caps and the tail of each ink sac has a recess. Adjacent ink sacs are connected by the protrusion and the recess, and the protrusion has a first ferromagnetic member, and the recess has a second ferromagnetic member, so that the protrusion and the recess of adjacent ink sacs are magnetically connected by the magnetic attraction between the first ferromagnetic member and the second ferromagnetic member.

[0008] The present invention is further configured such that multiple ink sacs are connected end to end in sequence to form a combined ink sac, so that the end cap of the head ink sac of the combined ink sac is removed and connected to the tail of the tail ink sac of the combined ink sac, and the mouth of the head ink sac of the combined ink sac is connected to the inner end interface of the pen tip assembly.

[0009] The present invention is further configured such that the end cap includes an annular wall cavity, the inner circumferential surface of the annular wall cavity is provided with an internal thread, the annular wall cavity is threadedly connected to the opening of the ink sac, and one end of the annular wall cavity protrudes to form the protrusion.

[0010] The present invention is further configured such that the outer peripheral surface of the opening of the ink sac is provided with an external thread, and the opening of the head ink sac of the combined ink sac is threadedly connected to the inner end of the pen tip assembly.

[0011] The present invention is further configured such that the outer diameter of the protrusion is smaller than the outer diameter of the annular wall cavity, so as to form a positioning step between the protrusion and the annular wall cavity.

[0012] The present invention is further configured such that the protrusion has a groove, the first ferromagnetic component is embedded in the groove, and the second ferromagnetic component is embedded in the recess.

[0013] The present invention is further configured such that the first ferromagnetic component is a magnet, and the second ferromagnetic component is a magnet or an iron block; or the first ferromagnetic component is an iron block, and the second ferromagnetic component is a magnet.

[0014] The present invention is further configured such that the tail end of the ink sac is open, and the opening of the tail end of the ink sac is covered with a tail cap, the outer end of the tail cap extending inward to form the recess.

[0015] The present invention is further configured such that the inner end face of the tail cap extends inward to form a plug, which is inserted into the opening at the tail end of the ink sac, and the outer peripheral surface of the tail cap extends circumferentially to form a flange, which abuts against the opening end face of the tail end of the ink sac.

[0016] The present invention is further configured such that the length of the receiving cavity of the pen body is greater than or equal to the sum of the lengths of the two ink sacs, and the inner diameter of the receiving cavity of the pen body is greater than the outer diameter of the ink sac.

[0017] As can be seen from the above technical solution, the combined ink cartridge writing pen of this utility model has a receiving cavity inside the pen body. The pen tip assembly is located at one end of the pen body, and multiple ink cartridges are housed in the receiving cavity. The end cap of each ink cartridge has a protrusion, and the tail of each ink cartridge has a concave portion. Adjacent ink cartridges are connected by interlocking the protrusion and the concave portion. The protrusion has a first ferromagnetic component, and the concave portion has a second ferromagnetic component. The magnetic attraction between the first and second ferromagnetic components magnetically connects the protrusion and the concave portion of adjacent ink cartridges, hiding multiple ink cartridges in the receiving cavity for later use. This facilitates storage and carrying, eliminating the need to carry an ink bottle. When the ink in the ink cartridge connected to the pen tip assembly is used up, the ink cartridges are swapped to replace them. When replacing ink cartridges, the pen body is first removed, and the empty ink cartridge is swapped with one of the ink cartridges containing ink to allow the ink in the ink cartridge to be replaced. The ink cartridges are connected to the pen tip assembly, and when the ink in the cartridge is depleted, a new ink cartridge can be added to the cartridge, making it convenient for users to use and replace ink cartridges at any time. In addition, the use of multiple ink cartridges allows for the selection of the number of ink cartridges to be combined and assembled into the cartridge according to the length of the writing pen. In industrial production, only one size of ink cartridge needs to be manufactured, which improves the applicability and versatility of the product. The combination and use are more flexible, and multiple ink cartridges are magnetically connected in sequence, avoiding the shaking and abnormal noise that would occur if multiple ink cartridges were placed separately in the cartridge. The structural design is more stable and reliable, and the user experience is better. Furthermore, the magnetic insertion method between adjacent ink cartridges makes the ink cartridge replacement process simple and quick, and facilitates the combination and assembly of multiple ink cartridges. The ink cartridge assembly structure is simple, and the processing difficulty and manufacturing cost are low.

[0018] To make the technical concept, other objectives, advantages, features and functions of this utility model clearer and easier to understand, preferred embodiments will be specifically described in the following detailed description, and will be illustrated in conjunction with the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a combined ink cartridge writing pen provided in an embodiment of this application;

[0021] Figure 2 This is an exploded view of the structure of a combined ink cartridge writing pen provided in an embodiment of this application;

[0022] Figure 3 This is an exploded view of the ink sac structure provided in the embodiments of this application;

[0023] Figure 4 This is an exploded view of the ink sac provided in an embodiment of this application from another perspective;

[0024] Figure 5 This is a front view of a combined ink cartridge writing pen provided in an embodiment of this application;

[0025] Figure 6 This is provided by the embodiments of this application. Figure 5 Sectional view of mid-section AA;

[0026] The above figures include the following reference numerals:

[0027] 10. Pen body; 11. Receiving cavity; 20. Pen tip assembly; 21. Outer end; 22. Inner end; 30. Ink sac; 31. Mouth; 40. End cap; 41. First ferromagnetic component; 411. Plug; 42. Ring wall cavity; 43. Groove; 44. Protrusion; 50. Tail cap; 51. Second ferromagnetic component; 52. Stop plate; 521. Through port; 53. Recess; 54. Plug. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Please refer to the following: Figures 1 to 6 This embodiment provides a combined ink cartridge 30 writing pen, which is mainly a fountain pen. It includes a pen body 10, a pen tip assembly 20, and multiple ink cartridges 30. The pen body 10 has a receiving cavity 11 inside. The pen tip assembly 20 is disposed at one end of the pen body 10. Multiple ink cartridges 30 are all housed in the receiving cavity 11. The end cap 40 of the ink cartridge 30 is provided with a protrusion 44, and the tail of the ink cartridge 30 is provided with a recess 53. Two adjacent ink cartridges 30 are connected by the protrusion 44 and the recess 53. The protrusion 44 has a first ferromagnetic member 41, and the recess 53 has a second ferromagnetic member 51. The magnetic attraction between the first ferromagnetic member 41 and the second ferromagnetic member 51 allows the protrusion 44 of two adjacent ink cartridges 30 to be magnetically connected to the recess 53.

[0030] As can be seen, the combined ink cartridge 30 writing pen of this embodiment has a receiving cavity 11 inside the pen body 10, the pen tip assembly 20 is disposed at one end of the pen body 10, and multiple ink cartridges 30 are housed in the receiving cavity 11. The end cap 40 of the ink cartridge 30 is provided with a protrusion 44, and the tail of the ink cartridge 30 is provided with a recess 53. Two adjacent ink cartridges 30 are connected by the protrusion 44 and the recess 53. The protrusion 44 has a first ferromagnetic member 41, and the recess 53 has a second ferromagnetic member 51, so that the protrusion 44 and the recess 53 of two adjacent ink cartridges are magnetically connected by the magnetic attraction between the first ferromagnetic member 41 and the second ferromagnetic member 51. Multiple ink cartridges 30 are concealed within the receiving cavity 11 for easy storage and portability, eliminating the need to carry an ink bottle. When the ink in an ink cartridge 30 connected to the nib assembly 20 is depleted, the position of the ink cartridge 30 is changed for replacement. To replace an ink cartridge 30, the pen body 10 is removed, and the depleted ink cartridge 30 is swapped with one of the ink cartridges 30 containing ink, thus placing the ink cartridge 30 connected to the nib assembly 20. Furthermore, when all the ink in the ink cartridges 30 within the receiving cavity 11 is depleted, new ink cartridges 30 can be added to the receiving cavity 11, facilitating user use and easy replacement. Additionally, the use of multiple ink cartridges 30 allows for flexible arrangement depending on the writing pen's specifications. The ink cartridges 30 are selected in an adaptive manner to combine and assemble into the receiving cavity 11. In industrial production, only one size of ink cartridge 30 needs to be manufactured to improve the applicability and versatility of the product. The combination and use are more flexible. In addition, multiple ink cartridges 30 are magnetically connected in sequence, which avoids shaking and abnormal noise that would occur if multiple ink cartridges 30 were placed separately in the receiving cavity 11. The structural design is more stable and reliable, and the user experience is better. Furthermore, the magnetic plug-in method between two adjacent ink cartridges 30 makes the process of replacing ink cartridges 30 simple and quick, and facilitates the combination and assembly of multiple ink cartridges 30. Moreover, the combination structure of ink cartridges 30 is simple, and the processing technology and manufacturing cost are low.

[0031] Specifically, such as Figure 2 and Figure 6 As shown, multiple ink cartridges 30 are connected end-to-end to form a combined ink cartridge 30. The end cap 40 of the head ink cartridge 30 of the combined ink cartridge 30 is removed and attached to the tail ink cartridge 30. The opening 31 of the head ink cartridge 30 of the combined ink cartridge 30 is connected to the inner end interface of the pen tip assembly 20. This design simplifies the structure of the combined ink cartridge 30, makes ink cartridge replacement easier and more convenient, and provides a better user experience.

[0032] Furthermore, such as Figure 3 and Figure 4As shown, the end cap 40 includes an annular wall cavity 42, the inner circumferential surface of the annular wall cavity 42 is provided with an internal thread, the annular wall cavity 42 is threadedly connected to the opening 31 of the ink sac 30, and one end of the annular wall cavity 42 protrudes to form a protrusion 44. The end cap 40 is made of plastic by one-piece injection molding, which has low processing cost, and the threaded connection makes the structure more stable.

[0033] Specifically, the nib assembly 20 is divided into an outer end 21 and an inner end 22. The outer end 21 is used for writing, and the inner end 22 is connected to the ink cartridge 30. The pen body 10 is threadedly connected to the nib assembly 20. The connection between the ink cartridge 30 and the nib assembly 20 is simple and facilitates the replacement of the ink cartridge 30. In addition, the internal structure and principle of the nib assembly 20 are existing technologies and will not be described in detail here.

[0034] In this embodiment, the outer peripheral surface of the opening 31 of the ink sac 30 is provided with external threads, and the opening 31 of the ink sac 30 is threadedly connected to the inner end 22 of the pen tip assembly 20. The ink sac 30 is made of plastic through one-piece injection molding, which has low processing cost. The connection between the ink sac 30 and the pen tip assembly 20 is simple, which facilitates the replacement of the ink sac 30.

[0035] Specifically, such as Figure 3 and Figure 4 As shown, the outer diameter of the protrusion is smaller than the outer diameter of the annular wall cavity 42, so that a positioning step is formed between the protrusion 44 and the annular wall cavity 42, so that when the protrusion 44 and the cavity 53 are inserted, the end face of the cavity 53 abuts against the positioning step. Furthermore, the outer diameter of the annular wall cavity 42 is approximately the same as the outer diameter of the ink sac 30. In this way, when the end cap 40 is installed on the opening 31 of the ink sac 30, the combined ink sac 30 is of uniform thickness. The structure is cleverly designed and reliable, and the combined ink sac 30 is stable and not easy to shake.

[0036] Furthermore, such as Figure 3 and Figure 4 As shown, the protrusion 44 has a groove 43, the first ferromagnetic component 41 is embedded in the groove 43, and the second ferromagnetic component 51 is embedded in the recess 53. The ferromagnetic components make the structure of the combined ink bag 30 more stable, the installation structure is stable and reliable, and it is easy to assemble and process.

[0037] In this embodiment, the first ferromagnetic component 41 is a magnet, and the second ferromagnetic component 51 is an iron block. The ink cartridge is assembled by magnetic attraction between the magnet and the iron block. A plug 411 is provided on the magnet, and a positioning hole is correspondingly provided on the inner wall of the groove 43, so that the first ferromagnetic component 41 is fixed in the groove 43 by inserting the plug 411 into the positioning hole. In other embodiments, the first ferromagnetic component 41 is an iron block, and the second ferromagnetic component 51 is a magnet. Changing only the combination method of the magnet and the iron block is also within the protection scope of this utility model. Furthermore, of course, both the first ferromagnetic component 41 and the second ferromagnetic component 51 can be magnets, so that the ink cartridge 30 is assembled by magnetic attraction between the two magnets.

[0038] In this embodiment, the tail end of the ink sac 30 is open, and a tail cap 50 is provided at the opening of the tail end of the ink sac 30. The outer end of the tail cap 50 extends inward to form a recess 53. A stop piece 52 is also provided in the recess 53. The stop piece 52 is provided with a through opening 521. The stop piece 52 is made of soft rubber material and is used to prevent the tail cap 50 from detaching from the second ferromagnetic component 51 from the recess 53. The installation structure is designed to be stable and reliable. Of course, the first ferromagnetic component 41 and the second ferromagnetic component 51 can also adopt other existing installation structures. The tail cap 50 and the ink sac 30 body adopt a separate assembly structure, which facilitates the production and processing of the tail cap 50 and the ink sac 30 body. The processing difficulty and manufacturing cost are low, and the assembly is simple and quick.

[0039] Specifically, the inner end face of the tail cap 50 extends inward to form a plug 54, which is inserted into the opening at the tail end of the ink sac 30. The outer peripheral surface of the tail cap 50 extends circumferentially to form a flange, which abuts against the opening end face of the ink sac 30. This arrangement, by inserting the plug 54 into the opening at the tail end of the ink sac 30, improves the sealing of the assembly structure, effectively preventing ink from flowing out of the ink sac 30 from the rear, and further enhancing the stability and reliability of the structural design.

[0040] Furthermore, the length of the receiving cavity 11 of the pen body 10 is greater than or equal to the sum of the lengths of the two ink sacs 30, and the inner diameter of the receiving cavity 11 of the pen body 10 is greater than the outer diameter of the ink sacs 30.

[0041] In this embodiment, when the ink in the ink cartridge 30 connected to the pen tip assembly 20 is used up and the ink cartridge 30 needs to be replaced, first remove the pen body 10, then unscrew the combined ink cartridge 30 from the inner end 22 of the pen tip assembly 20, then remove the ink cartridge 30 with empty ink from the combined ink cartridge 30, then remove the end cap 40 connected to the tail of the combined ink cartridge 30 and install it on the ink cartridge 30 with empty ink, then insert the ink cartridge 30 with empty ink into the tail of the combined ink cartridge 30, finally unscrew the end cap 40 of the unused ink cartridge 30 and connect it to the tail of the combined ink cartridge 30, and tighten the unused ink cartridge 30 onto the inner end of the pen tip assembly 20, then put the pen body 10 back on to complete the replacement of the ink cartridge 30 with ink. The replacement operation is easy and simple.

[0042] As can be seen from the above description, the above-described embodiments of this utility model achieve the following technical effects: the pen body 10 has a receiving cavity 11 inside, the pen tip assembly 20 is disposed at one end of the pen body 10, a plurality of ink sacs 30 are housed in the receiving cavity 11, the end cap 40 of the ink sac 30 is provided with a protrusion, the tail of the ink sac 30 is provided with a recess 53, and two adjacent ink sacs 30 are connected by the protrusion and the recess 53, and the protrusion has a first ferromagnetic member 41, and the recess 53 has a second ferromagnetic member 51, so that the protrusion and the recess 53 of two adjacent ink sacs 30 are magnetically connected by the magnetic attraction between the first ferromagnetic member 41 and the second ferromagnetic member 51. Multiple ink cartridges 30 are concealed within the receiving cavity 11 for easy storage and portability, eliminating the need to carry an ink bottle. When the ink in an ink cartridge 30 connected to the nib assembly 20 is depleted, the position of the ink cartridge 30 is changed for replacement. To replace an ink cartridge 30, the pen body 10 is removed, and the depleted ink cartridge 30 is swapped with one of the ink cartridges 30 containing ink, thus placing the ink cartridge 30 connected to the nib assembly 20. Furthermore, when all the ink in the ink cartridges 30 within the receiving cavity 11 is depleted, new ink cartridges 30 can be added to the receiving cavity 11, facilitating user use and easy replacement. Additionally, the use of multiple ink cartridges 30 allows for flexible arrangement depending on the writing pen's specifications. The ink cartridges 30 are selected in an adaptive manner to combine and assemble into the receiving cavity 11. In industrial production, only one size of ink cartridge 30 needs to be manufactured to improve the applicability and versatility of the product. The combination and use are more flexible. In addition, multiple ink cartridges 30 are magnetically connected in sequence, which avoids shaking and abnormal noise that would occur if multiple ink cartridges 30 were placed separately in the receiving cavity 11. The structural design is more stable and reliable, and the user experience is better. Furthermore, the magnetic plug-in method between two adjacent ink cartridges 30 makes the process of replacing ink cartridges 30 simple and quick, and facilitates the combination and assembly of multiple ink cartridges 30. Moreover, the combination structure of ink cartridges 30 is simple, and the processing technology and manufacturing cost are low.

[0043] It should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "set, connect, link, install" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, abutting connections, or integral connections. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "lateral, longitudinal, vertical, horizontal" and "top, bottom" are generally based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; in addition, the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0045] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] Certain terms are used in the specification and claims of this utility model to refer to specific elements. Those skilled in the art will understand that manufacturers may use different names to refer to the same components, and this document is not intended to distinguish between components that have the same function but different names. In the following specification and claims, words such as “comprising,” “having,” and “including” are open-ended terms and should therefore be interpreted as “containing but not limited to…”.

[0047] In the description of this specification, the terms "an embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] Furthermore, it should be noted that in the description of this utility model, the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0049] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A combined ink cartridge writing pen, characterized in that, include: The pen body has an internal cavity. A pen tip assembly, wherein the pen tip assembly is disposed at one end of the pen body; Multiple ink sacs are housed within the receiving cavity. One of the end caps and the tail of each ink sac has a protrusion, and the other of the end caps and the tail of each ink sac has a recess. Adjacent ink sacs are connected by the protrusion and the recess, and the protrusion has a first ferromagnetic member, and the recess has a second ferromagnetic member, so that the protrusion and the recess of adjacent ink sacs are magnetically connected by the magnetic attraction between the first ferromagnetic member and the second ferromagnetic member.

2. The combined ink cartridge writing pen according to claim 1, characterized in that, Multiple ink sacs are connected end to end to form a combined ink sac, so that the end cap of the head ink sac of the combined ink sac is removed and connected to the tail ink sac of the combined ink sac, and the mouth of the head ink sac of the combined ink sac is connected to the inner end interface of the pen tip assembly.

3. The combined ink cartridge writing pen according to claim 1, characterized in that, The end cap includes an annular wall cavity, the inner circumferential surface of which is provided with an internal thread. The annular wall cavity is threadedly connected to the opening of the ink sac, and one end of the annular wall cavity protrudes to form the convex portion.

4. The combined ink cartridge writing pen according to claim 2, characterized in that, The outer circumferential surface of the ink sac opening is provided with external threads, and the opening of the head ink sac of the combined ink sac is threadedly connected to the inner end of the pen tip assembly.

5. The combined ink cartridge writing pen according to claim 3, characterized in that, The outer diameter of the protrusion is smaller than the outer diameter of the annular wall cavity, so that a positioning step is formed between the protrusion and the annular wall cavity.

6. The combined ink cartridge writing pen according to any one of claims 1 to 5, characterized in that, The protrusion has a groove, the first ferromagnetic component is embedded in the groove, and the second ferromagnetic component is embedded in the recess.

7. The combined ink cartridge writing pen according to claim 6, characterized in that, The first ferromagnetic component is a magnet, and the second ferromagnetic component is a magnet or an iron block; Alternatively, the first ferromagnetic component may be an iron block, and the second ferromagnetic component may be a magnet.

8. The combined ink cartridge writing pen according to any one of claims 1 to 5, characterized in that, The ink sac has an open end, and the open end of the ink sac is covered with a tail cap. The outer end of the tail cap extends inward to form the recess.

9. The combined ink cartridge writing pen according to claim 8, characterized in that, The inner end face of the tail cap extends inward to form a plug, which is inserted into the opening at the tail end of the ink sac. The outer peripheral surface of the tail cap extends circumferentially to form a flange, which abuts against the opening end face of the tail end of the ink sac.

10. The combined ink cartridge writing pen according to any one of claims 1 to 5, characterized in that, The length of the cavity containing the pen body is greater than or equal to the sum of the lengths of the two ink sacs, and the inner diameter of the cavity containing the pen body is greater than the outer diameter of the ink sacs.

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