ballpoint refill

Abstract

The application discloses a ballpoint pen refill, which comprises an ink storage tube and a writing part arranged at the front end of the ink storage tube, wherein the writing part comprises a ball, a ball fixing seat and a pen head sleeve; the ball is arranged at the front end of the ball fixing seat in a rolling mode; the pen head sleeve is arranged outside the ball fixing seat; the ball fixing seat comprises an ink outlet channel connected with the ink storage tube; an ink outlet gap connected with the ink outlet channel is formed at the rolling connection position of the ball and the ball fixing seat; an ink storage cavity is formed between the pen head sleeve and the ball fixing seat; an ink flow channel with capillary action is formed between the front end of the ink storage cavity and the front end of the ink outlet gap; and the ink storage cavity is connected with the atmosphere. The ballpoint pen refill can automatically adjust the ink supply amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stationery, in particular to a ballpoint refill. BACKGROUND

[0002] A ballpoint pen is a pen that dispenses writing material through the rolling action of a ball at the tip of the pen or refill. A conventional ballpoint pen includes a refill and a pen barrel, the refill includes a reservoir, a tip disposed at the front end of the reservoir, the tip has a rotatable ball disposed at the front end, the tip includes a feed channel in communication with the reservoir, the reservoir contains water-based or gel-based ink. When the pen is used to write on paper, the ball can roll along the paper surface while bringing ink from the feed channel and adhering to the paper surface, which has good writing quality.

[0003] A ballpoint pen is disclosed in Chinese patent CN108349294B, which has a first writing part with a writing ball on the pen tip side, a retaining member that stores the writing ball, and a second writing part that has the writing ball and a sleeve member. The second writing part is provided on the pen tip side and can draw lines that are thicker than those drawn by the first writing part. When writing, the writing ball alone works on the paper surface when the relative angle between the pen and the paper is large and the force is light, and the second writing part also participates in writing when the relative angle between the pen and the paper is small and the force is large. Thus, the user can easily distinguish between thin and thick lines by adjusting the pen pressure and the angle of the hand.

[0004] However, the variation of the thickness and darkness of the written lines and the speed of writing have certain requirements for the size of the ink supply. For example, more ink supply is needed when writing thick lines or writing fast, and less ink supply is needed when writing thin lines or writing slowly.

[0005] Taking the ballpoint pen shown in the above patent as an example, the ink is supplied by being sent out through the gap between the writing ball and the retaining member. However, the size of the gap is usually fixed (or changes little), and the supply of ink is relatively stable. This leads to the fact that if the gap is designed to be larger (with larger ink supply), more ink is likely to remain on the paper surface when writing thin lines or writing slowly, affecting the uniformity and aesthetics of the lines, and also affecting the drying speed of the lines. If the gap is designed to be smaller (with less ink supply), there is not enough ink or the supply of ink is interrupted when writing thick lines or writing fast, affecting the aesthetics of the final written characters. It is difficult to reflect the darkness and thickness of the characters when writing. SUMMARY

[0006] The present application provides a ballpoint refill that can automatically adjust the supply of ink according to the writing conditions.

[0007] In order to achieve the above object, the application provides a ballpoint refill, comprising a storage tube, a writing part arranged at the front end of the storage tube, the storage tube is used for storing ink for writing, the writing part is in contact with the paper surface during use, and can guide the ink in the storage tube to the paper surface to form writing traces, the writing part comprises a ball, a ball fixing seat and a pen tip sleeve, the ball is arranged at the front end of the ball fixing seat and rolls, the pen tip sleeve is arranged outside the ball fixing seat, the ball fixing seat comprises an ink outlet channel connected with the storage tube, the rolling connection part of the ball and the ball fixing seat is provided with an ink outlet gap connected with the ink outlet channel, the ball fixing seat can guide the ink to the ball and carry out the ink from the ink outlet gap through the rolling of the ball, the pen tip sleeve and the ball fixing seat are provided with a storage cavity capable of storing a small amount of ink, the front end of the storage cavity and the front end of the ink outlet gap are provided with an ink flow channel with capillary effect, and the rear end of the storage cavity is connected with the atmosphere.

[0008] During writing, when the writing speed of the ballpoint refill is slow, the ink at the front end of the ink outlet gap is affected by the capillary effect and is absorbed into the storage cavity through the ink flow channel for temporary storage, so that the problem of excessive ink supply during slow writing can be avoided, the writing traces are more neat and beautiful, the ink on the paper surface can be dried faster, the paper surface is not easy to be stained, and the cleanliness of the paper surface is ensured; when the writing speed of the ballpoint refill is fast, the ink stored in the storage cavity is transported to the front end of the ink outlet gap through the ink flow channel under the influence of the surface tension of the ink and gravity, so as to compensate for the problem of insufficient ink supply, so that the problem of insufficient ink supply during fast writing can be avoided, the problem of writing interruption caused by insufficient ink supply is not easy to occur, and the thickness of the writing traces can be ensured.

[0009] The ink flow channel can be composed of an annular gap between the pen tip sleeve and the ball fixing seat, or can be composed of a plurality of capillary holes arranged between the pen tip sleeve and the ball fixing seat. The capillary holes can be integrally formed on the pen tip sleeve or the ball fixing seat, or can be separate components mounted on the writing part.

[0010] The ink flow channel is a plurality of and is arranged in a circumferential direction along the axis of the ballpoint refill, and the storage cavity is annular and is arranged concentrically with the ballpoint refill. The plurality of ink flow channels can improve the flow rate of the ink, and when the ballpoint refill writes in different directions, the supply amount of the ink can be adjusted.

[0011] The front end of the ball fixing seat comprises a tapered portion, the front end of the tapered portion is arranged outside the pen head sleeve, the rear end of the tapered portion is sleeved inside the pen head sleeve, the front end of the pen head sleeve comprises a elastic wrapping portion sleeved outside the rear end of the tapered portion, a part of the hole wall of the capillary hole constituting the ink flow channel is formed by the outer side wall of the ball fixing seat, and the other part is formed by the groove arranged on the inner side wall of the pen head sleeve, or a part of the hole wall of the capillary hole constituting the ink flow channel is formed by the inner side wall of the pen head sleeve, and the other part is formed by the groove arranged on the outer side wall of the ball fixing seat; the ink storage cavity is formed by the groove arranged on the inner side wall of the pen head sleeve or the outer side wall of the ball fixing seat. With the structure design, the production and processing of the ink flow channel are facilitated, and the structural strength of the writing part can be maintained.

[0012] When the ballpoint pen core is used to write in an inclined posture with a large force, the elastic wrapping portion is deformed under the force, the gap between the lower part of the elastic wrapping portion and the lower part of the tapered portion is increased correspondingly, the increased gap can increase the ink output of the ink storage cavity, and the ink directly flows out along the increased gap, so that the writing trace can be thicker and darker. Based on the change of the force during writing, the writing trace with different thicknesses and shades can be more obviously written, the line change of writing is more rich, and the fun of writing is improved.

[0013] The elastic wrapping portion has a tapered inner side wall, the front end of the inner side wall of the elastic wrapping portion is sleeved on the rear end of the tapered portion, and the rear end of the inner side wall of the elastic wrapping portion extends to a position corresponding to the ink storage cavity.

[0014] With the above structure design, when the elastic wrapping portion is deformed under the force, the gap between the lower part of the elastic wrapping portion and the lower part of the tapered portion can extend to the ink storage cavity, so that the ink output of the ink storage cavity can be significantly increased, and the above effect can be further improved.

[0015] Further, the ink storage cavity is at least two layers and is arranged in an axial interval, the ink flow channel is connected with the frontmost layer of the ink storage cavity (i.e. the layer closest to the front end of the writing part), the rearmost layer of the ink storage cavity (i.e. the layer closest to the rear end of the writing part) is connected with the atmosphere, and the adjacent two layers of the ink storage cavity are connected through the flow guide channel with the capillary effect. When the front layer of the ink storage cavity is full of ink, the excess ink is transported to the rear layer of the ink storage cavity through the flow guide channel by the capillary effect, so that the ink storage capacity of the whole ink storage cavity can be increased. When writing a long trace at a faster speed, the problem that the trace is thinned or interrupted due to insufficient ink supply can be avoided. In addition, compared with the scheme of using a single-layer ink storage cavity with a larger capacity, the structure design of the multi-layer ink storage cavity can ensure the structural strength of the writing part of the ballpoint pen core under the premise of increasing the ink storage capacity.

[0016] Further, the flow guide channels are multiple and are arranged in a circumferential direction along the axis of the ballpoint pen refill. The arrangement of multiple flow guide channels can improve the ink delivery flow between the adjacent two layers of the ink storage chamber, and enable the ballpoint pen refill to achieve better ink delivery effect when writing in different directions.

[0017] Further, the flow guide channels are composed of capillary holes arranged between the pen head sleeve and the ball fixing seat, a part of the hole wall of the capillary hole constituting the flow guide channels is composed of the outer side wall of the ball fixing seat, and the other part is composed of the groove opened on the inner side wall of the pen head sleeve, or a part of the hole wall of the capillary hole is composed of the inner side wall of the pen head sleeve, and the other part is composed of the groove opened on the outer side wall of the ball fixing seat. With this structure design, the production and processing of the flow guide channels are facilitated, and the structural strength of the writing part is maintained.

[0018] In the above scheme, the ink flow channel and the flow guide channel can be used not only for delivering ink to the rear ink storage chamber, but also for storing a small amount of ink, thereby improving the overall ink storage capacity.

[0019] Further, an air passage is formed between the pen head sleeve and the ball fixing seat, the front end of the air passage is connected with the rear end of the ink storage chamber, the rear end of the air passage is provided with an opening between the rear end of the pen head sleeve and the rear end of the ball fixing seat (i.e. the rear end of the sleeved and fitted part of the pen head sleeve and the ball fixing seat), and the ink storage chamber is connected with the outside atmosphere through the air passage.

[0020] Further, the air passage is composed of capillary holes arranged between the pen head sleeve and the ball fixing seat, a part of the hole wall of the capillary hole constituting the air passage is composed of the outer side wall of the ball fixing seat, and the other part is composed of the groove opened on the inner side wall of the pen head sleeve, or a part is composed of the inner side wall of the pen head sleeve, and the other part is composed of the groove opened on the outer side wall of the ball fixing seat. With this structure design, the production and processing of the air passage are facilitated, and the structural strength of the writing part is maintained. This makes the air passage not only be able to balance the pressure, but also be able to absorb and store a small amount of excess ink by capillary action when the ink storage chamber is full of ink, thereby improving the overall ink storage capacity.

[0021] The ballpoint pen refill of the present application can automatically adjust the ink supply according to the speed of writing. When writing at a slower speed, it can prevent the problems of slow ink drying and over-thick writing lines caused by too much ink supply and slow consumption. When writing at a faster speed, it can prevent the problems of ink supply interruption and over-thin writing lines caused by too little ink supply and fast consumption, thereby ensuring the cleanliness of the paper, improving the beauty of the writing lines, and enhancing the pleasure of writing. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure diagram of the writing part of the first embodiment of the present application;

[0023] Figure 2 Structure diagram of the front end of the writing part of the first embodiment of the present application;

[0024] Figure 3 Structure diagram of the writing part of the second embodiment of the present application; Figure 1 Sectional view along the section line A-A;

[0025] Figure 4 Structure diagram of the writing part of the third embodiment of the present application; Figure 3 Structure diagram of the elastic wrapping part in the third embodiment of the present application when it is deformed under force;

[0026] Figure 5 Structure diagram of the writing part of the fourth embodiment of the present application; Figure 4 Structure diagram of the writing part of the fourth embodiment of the present application;

[0027] Figure 6 Structure diagram of the elastic wrapping part in the fourth embodiment of the present application when it is deformed under force; Figure 5 Structure diagram of the elastic wrapping part in the fourth embodiment of the present application when it is deformed under force;

[0028] Figure 7 Structure diagram of the writing part of the third embodiment of the present application; Figure 4 Structure diagram of the writing part of the third embodiment of the present application;

[0029] Figure 8 Structure diagram of the elastic wrapping part in the third embodiment of the present application when it is deformed under force; Figure 6 Structure diagram of the elastic wrapping part in the third embodiment of the present application when it is deformed under force;

[0030] Figure 9 Structure diagram of the writing part of the first embodiment of the present application in the first use state;

[0031] Figure 10 Structure diagram of the writing part of the first embodiment of the present application in the second use state;

[0032] Figure 11 Structure diagram of the writing part of the first embodiment of the present application in the third use state;

[0033] Figure 12 Structure diagram of the writing part of the third embodiment of the present application;

[0034] Figure 13 Structure diagram of the writing part of the fourth embodiment of the present application;

[0035] Figure 14 Structure diagram of the first application mode of the present application;

[0036] Figure 15 Structure diagram of the second application mode of the present application;

[0037] Figure 16 Structure diagram of the third application mode of the present application. DETAILED DESCRIPTION

[0038] The first embodiment of the ballpoint refill of the present application comprises a reservoir 1 for storing ink used for writing, a writing part 2 arranged at the front end of the reservoir 1, the writing part 2 is used to contact with the paper surface and can guide the ink in the reservoir 1 to adhere on the paper surface to form writing traces, the writing part 2 comprises a ball 3, a ball fixing seat 4 and a pen tip sleeve 5, the ball 3 is arranged at the front end of the ball fixing seat 4, the pen tip sleeve 5 is arranged outside the ball fixing seat 4, the ball fixing seat 4 comprises an ink outlet channel 41 connected with the reservoir 1, the rolling connection between the ball 3 and the ball fixing seat 4 forms an ink outlet gap 42 connected with the ink outlet channel 41, the ball fixing seat 4 can guide the ink to the ball 3 and carry out the ink from the ink outlet gap 42 through the rolling of the ball 3, the pen tip sleeve 5 and the ball fixing seat 4 form an ink storage cavity 6, the ink storage cavity 6 can store a small amount of ink, the front end of the ink storage cavity 6 and the front end of the ink outlet gap 42 form an ink flow channel 71 with capillary action, and the rear end of the ink storage cavity 6 is connected with the atmosphere.

[0039] During the writing process, when the writing speed of the ballpoint refill is slow, the ink at the front end of the ink outlet gap 42 is affected by the capillary action and is absorbed into the ink storage cavity 6 through the ink flow channel 71 for temporary storage, so that the situation of excessive ink supply during slow writing can be avoided, the writing traces are more neat and beautiful, the ink on the paper can dry faster, the paper is not easy to be stained, and the cleanliness of the paper is ensured; when the writing speed of the ballpoint refill is fast, the ink stored in the ink storage cavity 6 is transported to the front end of the ink outlet gap 42 through the ink flow channel 71 due to the surface tension and gravity of the ink, so as to make up for the problem of insufficient ink supply, so that the situation of insufficient ink supply during fast writing can be avoided, the problem of writing interruption caused by insufficient ink supply is not easy to occur, and the thickness of the writing traces can be ensured.

[0040] The ink flow channel 71 is composed of a capillary hole arranged between the pen tip sleeve 5 and the ball fixing seat 4, in the first embodiment, as shown in Figure 3 、 Figure 4 、 Figures 9 to 11 part of the hole wall of the capillary hole constituting the ink flow channel 71 is composed of the outer side wall 4a of the ball fixing seat 4, and the other part is composed of the groove 51 opened on the inner side wall of the pen tip sleeve 5, and the ink storage cavity 6 is composed of the groove 44 opened on the outer side wall of the ball fixing seat 4.

[0041] In the second embodiment, as shown in Figure 5 、 Figure 6 、 Figure 12As shown, a part of the hole wall of the capillary hole constituting the ink flow channel 71 is formed by the inner side wall 5a of the pen tip cover 5, and another part is formed by the groove 43 provided on the outer side wall of the ball fixing seat 4.

[0042] In the third embodiment, as shown in Figure 7 、 Figure 8 the hole wall of the capillary hole constituting the ink flow channel 71 is formed by the radial spacing between the outer side wall 4a of the ball fixing seat 4 and the inner side wall 5a of the pen tip cover 5, and the ink flow channel 71 has a ring structure.

[0043] In the scheme of the first or second embodiment, the ink flow channel 71 is multiple and is arranged circumferentially along the axis of the ballpoint pen refill, and the ink storage cavity 6 is annular and is arranged concentrically with the ballpoint pen refill. The arrangement of multiple ink flow channels 71 can increase the size of the ink flow, and when the ballpoint pen refill is used to write in different directions, the supply amount of ink can be adjusted. In the scheme of the third embodiment, since the ink flow channel 71 has a ring structure, when the ballpoint pen refill is used to write in different directions, the supply amount of ink can be adjusted.

[0044] In the above-mentioned structural schemes of the ink flow channel 71, especially the schemes of the first and second embodiments can significantly reduce the requirement for process precision during production and processing.

[0045] In addition, as shown in Figures 9 to 12 the front end of the ball fixing seat 4 includes a tapered portion 40, the front end of the tapered portion 40 is arranged outside the pen tip cover 5, the rear end of the tapered portion 40 is sleeved inside the pen tip cover 5, and the front end of the pen tip cover 5 includes an elastic wrapping portion 50 sleeved outside the rear end of the tapered portion 40. The pen tip cover 5 is made of a material such as plastic that is easy to deform, and the ball fixing seat 4 is made of a metal material.

[0046] Based on the above structure, as shown in Figure 4 、 Figure 6 、 Figure 8 、 Figure 11 when the ballpoint pen refill is used to write in an inclined posture with a large force, the elastic wrapping portion 50 deforms under stress, the gap b between the lower part of the elastic wrapping portion 50 and the lower part of the tapered portion 40 increases accordingly, and the increased gap b can increase the ink discharge amount of the ink storage cavity 6, so that the writing trace can be made thicker and darker. Based on the change of the force during writing, the writing trace with different shades and thicknesses can be more obviously written, the line changes during writing are more rich, and the fun of writing is improved.

[0047] The elastic wrapping portion 50 has a conical inner wall, the front end sleeve of the inner wall of the elastic wrapping portion 50 is arranged at the rear end of the conical portion 40, and the rear end of the inner wall of the elastic wrapping portion 50 extends backward to a position corresponding to the ink storage cavity 6.

[0048] With this structural design, when the elastic wrapping portion 50 deforms under force, the increased gap "b" between the lower portion of the elastic wrapping portion 50 and the lower portion of the tapered portion 40 extends to the ink reservoir 6, significantly increasing the ink output of the ink reservoir 6 and further enhancing the aforementioned effect. Furthermore, the arc-shaped groove forming the ink reservoir 6 facilitates machining on the metal ball holder 4.

[0049] The ink storage chamber 6 is connected to the outside atmosphere through an air channel 72. The air channel 72 is formed between the pen tip cover 5 and the ball fixing seat 4. The front end of the air channel 72 is connected to the rear end of the ink storage chamber 6. The rear end of the air channel 72 is between the rear end of the pen tip cover 5 and the rear end of the ball fixing seat 4 (that is, the rear end of the socket fitting of the pen tip cover 5 and the ball fixing seat 4) and is provided with an opening 721.

[0050] like Figure 2 As shown, in the process in which the ink flow channel 71 uses capillary action to attract ink into the ink storage chamber 6 and in the process in which the ink is sent out from the ink storage chamber 6 under the action of surface tension and gravity, the air channel 72 can play a role in balancing the pressure.

[0051] In the first and fourth embodiments, as Figure 1 、 Figure 2 、 Figures 9 to 11 、 Figure 13 As shown, the air channel 72 is composed of a capillary hole arranged between the pen tip cover 5 and the ball fixing seat 4. A part of the hole wall of the capillary hole constituting the air channel 72 is composed of a groove 52 opened on the inner wall 5a of the pen tip cover 5, and the other part is composed of the outer wall 4a of the ball fixing seat 4.

[0052] The air channel 72 of the above-described structural design not only facilitates the production and processing of the air channel 72 but also helps maintain the structural strength of the writing portion 2. Furthermore, in addition to balancing the pressure, the air channel 72 can also absorb and store a small amount of excess ink by capillary action when the ink reservoir 6 is full of ink, thereby increasing the overall ink storage capacity.

[0053] In other embodiments, the hole wall of the capillary hole constituting the air channel 72 may also be partially composed of a groove opened on the outer wall 4a of the ball fixing seat 4, and the other part may be composed of the inner wall 5a of the pen tip cover 5; it may also be formed by the interval between the outer wall 4a of the ball fixing seat 4 and the inner wall 5a of the pen tip cover 5, that is, it may be a gap formed when the ball fixing seat 4 and the pen tip cover 5 are socketed.

[0054] In the first, second, or third embodiments, the ink reservoir 6 is a single-layer structure capable of storing a small amount of ink. The ink flow channel 71 itself can also store a small amount of ink, making it particularly suitable for writing. However, when writing longer lines, the ink stored in the ink reservoir 6 may be replenished more slowly than consumed.

[0055] In order to solve the above problem, in addition to increasing the volume of the ink storage chamber 6 by increasing its length or width, the problem can also be solved by adopting a multi-layer structure of the ink storage chamber 6.

[0056] For example, in the fourth embodiment, Figure 13 As shown, the ink storage chamber 6 has at least two layers. In the fourth embodiment, four layers are taken as an example. The four layers of the ink storage chamber 6 are spaced apart along the axial direction of the ballpoint pen core. The ink flow channel 71 is connected to the layer located at the front (i.e., the layer closest to the front end of the writing part 2), and the layer located at the rear (i.e., the ink storage chamber 6 closest to the rear end of the writing part 2) is connected to the outside atmosphere through the air channel 72. The two adjacent layers of the ink storage chamber 6 are connected by a guide channel 73 with capillary action.

[0057] When a layer of the ink storage chamber 6 located relatively in the front is filled with ink, the excess ink will be transported and stored to a layer of the ink storage chamber 6 located in the rear through the guide channel 73 by capillary action, thereby increasing the overall ink storage capacity. When writing longer handwriting at a faster speed, the problem of handwriting becoming thinner or interrupted due to insufficient ink supply in the single-layer ink storage chamber 6 can be avoided, making the present invention more suitable for use in drawing and other purposes. Compared with the solution of using a single-layer ink storage chamber 6 with a larger capacity, the structural design of the multi-layer ink storage chamber 6 can ensure the structural strength of the writing part of the ballpoint pen core while increasing the ink storage capacity. In addition, the guide channel 73 itself can also store a small amount of ink.

[0058] In the fourth embodiment, multiple guide channels 73 are provided, evenly distributed along the circumference of the ballpoint pen refill's axis. The provision of multiple guide channels 73 can increase the ink flow rate between adjacent ink reservoirs 6 and ensure better ink delivery when the ballpoint pen refill is written in different directions.

[0059] The guide channel 73 is composed of a capillary hole arranged between the pen tip cover 5 and the ball fixing seat 4. Similar to the ink flow channel 71 and the air channel 72, in the fourth embodiment, a part of the hole wall of the capillary hole constituting the guide channel 73 is composed of the outer wall 4a of the ball fixing seat 4, and the other part is composed of a groove opened on the inner wall of the pen tip cover 5.

[0060] In other embodiments, the hole wall of the capillary hole constituting the flow channel 73 can also be partly constituted by the outer side wall 4a of the ball fixing seat 4 and partly constituted by the inner side wall 5a of the pen head sleeve 5, i.e. the gap formed when the ball fixing seat 4 and the pen head sleeve 5 are sleeved; or partly constituted by the inner side wall 5a of the pen head sleeve 5 and partly constituted by the groove formed on the outer side wall 4a of the ball fixing seat 4.

[0061] In other embodiments, the ballpoint refill can also be integrally formed on the pen barrel.

[0062] The first application mode of the present application is shown in Figure 14 Fig. 1, which is a ballpoint refill with a direct liquid type ink control system.

[0063] The second application mode of the present application is shown in Figure 15 Fig. 2, which is a fixed neutral ballpoint refill.

[0064] The third application mode of the present application is shown in Figure 16 Fig. 3, which is an ink filling type ballpoint pen, wherein the refill and the pen barrel are in an integral structure, and the ink storage tube 1 can be used as a pen barrel.

[0065] The above embodiments are only preferred specific embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the technical solution range of the present application are also included in the protection scope of the present application.

Claims

1. A ballpoint pen refill comprising an ink reservoir tube, a writing portion disposed at a front end of the ink reservoir tube, the writing portion comprising a ball, a ball holder, and a nib cap, the ball being rollably disposed at a front end of the ball holder, the nib cap being sleeved on an outer side of the ball holder, the ball holder including an ink outlet passage connected to the ink reservoir tube, an ink outlet gap being formed at a rolling connection between the ball and the ball holder connected to the ink outlet passage, and characterized in that: An ink storage chamber is formed between the pen tip cover and the ball fixing seat, and an ink flow channel with capillary action is formed between the front end of the ink storage chamber and the front end of the ink outlet gap, and the rear end of the ink storage chamber is connected to the outside atmosphere; the ink flow channel is composed of a plurality of capillary holes arranged between the pen tip cover and the ball fixing seat; there are multiple ink flow channels, and they are evenly distributed along the circumference of the axis of the ballpoint pen core, and the ink storage chamber is annular and is concentrically arranged with the ballpoint pen core; an air channel is formed between the pen tip cover and the ball fixing seat, the front end of the air channel is connected to the rear end of the ink storage chamber, and the rear end of the air channel is provided with an opening between the rear end of the pen tip cover and the rear end of the ball fixing seat, and the ink storage chamber is connected to the outside atmosphere through the air channel.

2. The ballpoint pen refill according to claim 1, characterized in that: The front end of the ball fixing seat includes a tapered portion, the front end of the tapered portion is arranged on the outside of the pen tip cover, and the rear end of the tapered portion is sleeved on the inside of the pen tip cover. The front end of the pen tip cover includes an elastic wrapping portion sleeved on the outside of the rear end of the tapered portion. A part of the hole wall of the capillary hole constituting the ink flow path is composed of the outer wall of the ball fixing seat, and the other part is composed of a groove opened on the inner wall of the pen tip cover, or a part of the hole wall of the capillary hole constituting the ink flow path is composed of the inner wall of the pen tip cover, and the other part is composed of a groove opened on the outer wall of the ball fixing seat; the ink storage chamber is composed of a groove opened on the inner wall of the pen tip cover or on the outer wall of the ball fixing seat.

3. The ballpoint pen refill according to claim 2, characterized in that: The elastic wrapping portion has a tapered inner wall, the front end sleeve of the inner wall of the elastic wrapping portion is arranged at the rear end of the tapered portion, and the rear end of the inner wall of the elastic wrapping portion extends backward to a position corresponding to the ink storage cavity.

4. The ballpoint pen refill according to claim 1, characterized in that: The ink storage chamber has at least two layers and is spaced apart along the axial direction of the ballpoint pen core. The ink flow channel is connected to the frontmost layer of the ink storage chamber, and the rearmost layer of the ink storage chamber is connected to the outside atmosphere. The two adjacent layers of the ink storage chamber are connected by a guide channel with capillary action.

5. The ballpoint pen refill according to claim 4, characterized in that: There are multiple guide channels, which are evenly distributed along the axis of the ballpoint pen core.

6. The ballpoint pen refill according to claim 4, characterized in that: The guide channel is composed of a capillary hole arranged between the pen tip cover and the ball fixing seat. A part of the hole wall of the capillary hole constituting the guide channel is composed of the outer wall of the ball fixing seat, and the other part is composed of a groove opened on the inner wall of the pen tip cover, or a part of the hole wall of the capillary hole is composed of the inner wall of the pen tip cover, and the other part is composed of a groove opened on the outer wall of the ball fixing seat.

7. The ballpoint pen refill according to claim 6, characterized in that: The air passage is composed of a capillary hole arranged between the pen tip cover and the ball fixing seat. A part of the hole wall of the capillary hole constituting the air passage is composed of the outer wall of the ball fixing seat, and the other part is composed of a groove opened on the inner wall of the pen tip cover, or a part is composed of the inner wall of the pen tip cover, and the other part is composed of a groove opened on the outer wall of the ball fixing seat.

Images