An adjustable nib ink supply structure and a pen having the same

Abstract

This invention discloses an adjustable ink supply structure for a pen feed and a fountain pen having the same, relating to the field of writing instrument technology. The ink supply structure includes a nib and a core. A main ink groove is axially formed on the side wall of the nib, and the core is threaded inside the nib and can move axially. A first axial groove and a second axial groove are respectively formed on both sides of the core. An ink channel is formed between the first axial groove and the inner wall of the nib, and the ink channel is connected to the main ink groove. An air intake channel is formed between the second axial groove and the inner wall of the nib, and an inclined surface is formed on the second axial groove. A variable air intake gap is formed between the inclined surface and the inner wall of the nib. When the core moves axially, the inclined surface changes the flow area of ​​the variable air intake gap to adjust the air intake, thereby controlling the ink supply. This invention achieves physical separation of the air and ink channels and continuous adjustment of the ink supply. The ink supply can be adjusted at any time according to the ink characteristics, paper type, or writing habits without disassembling the pen body. It is easy to operate and highly adaptable.

Description

Technical Field

[0001] This invention relates to the field of writing instrument technology, and more specifically to an adjustable feed ink supply structure and a fountain pen having the same. Background Technology

[0002] As a commonly used writing tool, the feed of a fountain pen is the core component that controls the ink delivery and ensures smooth writing. Its air intake and ink supply structure directly determines the stability and volume of ink output.

[0003] Currently, most conventional fountain pens on the market do not physically separate the air intake channel from the ink channel, allowing air and ink to mix and flow within the same cavity. During writing, the ink is easily disrupted by the airflow, leading to intermittent air supply and obstructed ink flow, which in turn causes problems such as intermittent ink interruptions and localized ink buildup, affecting the writing experience. In addition, the feed core and the feed of traditional pens are usually molded as a single piece or rigidly fixed assembly, and the feed core cannot move or be adjusted independently relative to the feed.

[0004] Traditional pen feeds typically have a fixed air intake structure, making it impossible to adjust the air intake volume. Different brands, concentrations, and fluidities of ink, as well as varying paper thicknesses and textures, and different writing pressures and styles, all result in varying ink supply requirements. A fixed air intake structure cannot flexibly match the usage scenario; either too much ink results in bleeding and ink dripping, or too little ink leads to dry, sparse strokes, making it poorly adaptable.

[0005] Some existing products adjust ink flow by changing the nib gap. This method not only has low adjustment precision but also easily causes nib deformation and damages components, and it cannot control the ink supply rate from the air intake source. Other fountain pen designs with adjustable ink supply, such as changing the ink cartridge compression by rotating the pen tail mechanism or changing the ink supply by replacing different sizes of the feed, either have complex structures and high manufacturing costs, or have low adjustment precision, only achieving stepped adjustment and not continuous stepless adjustment. Moreover, they often require special tools or disassembly of the pen body to complete the operation, resulting in poor ease of use.

[0006] Therefore, how to provide a pen feed ink supply structure that can achieve physical separation of the air-ink channel, flexibly adjust the air intake, and is easy to adjust is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides an adjustable ink feed structure, which aims to solve one of the above-mentioned technical problems.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable ink feed mechanism includes: The pen feed has a main ink groove axially formed on its side wall. The pen core is threaded inside the pen feed and can move axially along the pen feed axis. A first axial groove and a second axial groove are respectively formed on both sides of the pen core. The first axial groove forms an ink channel with the inner wall of the pen feed, and the ink channel communicates with the main ink groove. An air intake channel is formed between the second axial groove and the inner wall of the pen feed, and a slope is formed on the second axial groove. A variable air intake gap is formed between the slope and the inner wall of the pen feed. When the pen core moves axially, the slope changes the flow area of ​​the variable air intake gap to adjust the air intake volume, thereby controlling the ink supply.

[0009] Through the above technical solution, the present invention discloses an adjustable ink supply structure for a pen feed. It features a feed core that is threadedly connected to the feed and axially movable. A first axial groove and a second axial groove are respectively formed on both sides of the feed core, allowing the two grooves to enclose independent ink and air intake channels with the inner wall of the feed. Simultaneously, a slope is formed on the second axial groove, creating a variable air intake gap between the slope and the inner wall of the feed. When the feed core is rotated to move axially, the slope changes the flow area of ​​the variable air intake gap, thereby continuously adjusting the amount of air entering the ink chamber and achieving precise control of the ink supply. The present invention achieves physical separation of the ink and air channels, effectively eliminating the defects of traditional fountain pens caused by ink-air mixing, such as periodic clogging, intermittent air supply, and intermittent ink shortages. Without disassembling the pen body or replacing any parts, the ink supply can be finely adjusted at any time according to ink characteristics, paper type, or personal writing habits.

[0010] Preferably, in the above-described adjustable ink supply structure, an axially extending through-type ink slit is formed on the ink feed, and the through-type ink slit communicates with the main ink reservoir. This structure allows the ink in the main ink reservoir to be guided to the pen tip through the through-type ink slit, forming a continuous and stable ink supply path.

[0011] Preferably, the adjustable ink supply structure further includes an adjusting screw that extends laterally through both sides of the through-type ink slit and is threadedly connected to the side walls. By rotating the adjusting screw, the width of the through-type ink slit can be changed, thereby precisely controlling the ink output. This structure, together with the nib air intake adjustment, forms a dual-path independent adjustment mechanism for air intake and ink output, achieving controllability of the ink supply system. Simultaneously, it replaces the traditional, crude method of manually bending the nib, offering advantages such as high adjustment precision, no damage to the nib, and stable dimensions after adjustment. When used with the nib, it can also achieve synchronous adjustment of the ink slit of the nib and the nib slit.

[0012] Preferably, in the above-mentioned adjustable ink supply structure, the ink feed has multiple ink feed fins spaced apart, and the ink feed fins are in fluid communication with the main ink reservoir. The fin structure forms a capillary ink storage area around the main ink reservoir, which can provide buffered ink supply during writing and ensure that the ink tip is continuously supplied even when writing at high flow rates.

[0013] Preferably, in the above-mentioned adjustable ink supply structure for the ink feed, one end of the ink feed core has a radially protruding rib, the outer wall of the rib has a threaded structure that is threadedly connected to the inner wall of the ink feed, and the outer wall of the other end has a guide groove. The threaded structure ensures a precise connection between the ink feed core and the ink feed, and can generate stable axial displacement during rotation; the rib itself acts as a thread carrier, while increasing the contact area of ​​the connection part and improving the connection stability.

[0014] Preferably, in the above-described adjustable ink supply structure, a slotted groove is formed on the end face of the tongue core away from the rib. The slotted groove facilitates the rotation of the tongue core using a general-purpose tool (such as a flathead screwdriver), allowing adjustment to be completed without the need for special tools.

[0015] Preferably, the adjustable ink supply structure further includes a pen tip, which is attached to the outer surface of the pen tip on the side with the main ink groove. The pen tip has an ink-guiding slit corresponding to the main ink groove. This structure ensures precise alignment between the ink-guiding slit and the main ink groove, guaranteeing that ink can be smoothly guided from the main ink groove to the writing point of the pen tip. The pen tip's contact with the pen tip surface forms a stable capillary contact interface, ensuring continuous ink supply.

[0016] Preferably, the adjustable ink supply structure further includes a pen cap, which covers the outer side of the pen tip and secures the pen tip to the outer side of the pen feed with screws. The pen cap can distribute the pressure generated when the screws are tightened, preventing localized stress from damaging the pen tip and ensuring that the pen tip is subjected to uniform force and is not easily deformed. The pen cap extends to cover the middle of the pen tip, providing stable and continuous auxiliary ink guidance even when the pen tip is significantly split. The screw fastening method enables a detachable connection between the pen tip and the pen feed, allowing for non-destructive disassembly and assembly and convenient maintenance. In addition, the pen tip and pen cap can be made of different materials as needed.

[0017] Preferably, in the above-mentioned adjustable ink supply structure, the ink feed is made of titanium alloy or titanium alloy-based composite material. Titanium alloy has excellent properties such as high strength, high toughness, anti-aging, corrosion resistance, and wear resistance, effectively solving the long-standing technical problems of traditional plastic or hard rubber ink feeds being fragile, easily broken, and prone to cracking due to aging. The good biocompatibility and corrosion resistance of titanium alloy ensure that it will not undergo chemical changes even after long-term contact with various inks, guaranteeing the purity and stability of the ink supply.

[0018] The present invention also provides a fountain pen, including the above-described adjustable feed ink supply structure.

[0019] As can be seen from the above technical solution, compared with the prior art, the present invention discloses an adjustable ink feed structure, which has the following beneficial effects: 1. This invention provides an all-metal pen feed system with a threaded fit between the feed core and the ink supply, completely separated ink and air channels, and continuously stepless adjustment of the air intake. Independent ink and air channels are formed by the grooves on both sides of the feed core and the inner wall of the ink supply, respectively. A variable air intake gap is created by the inclined surface on the second groove of the feed core and the inner wall of the ink supply. Simultaneously, the feed core rotates with the ink supply through the thread on the outer wall of its rib, driving the feed core to move axially. Rotating the feed core to move axially continuously changes the air intake cross-sectional area, thereby linearly controlling the ink supply. This design effectively eliminates the intermittent ink shortage defect caused by ink mixing in traditional fountain pens, allowing for precise adjustment of the ink supply based on ink characteristics, paper type, or writing habits without disassembling the pen body.

[0020] 2. This invention uses a full titanium alloy or titanium alloy-based composite material to make the pen feed, combined with a modular design including a covered pen cap, a through-type ink slit adjustment screw, a fin capillary structure, and a ribbed threaded connection structure. This achieves high strength, corrosion resistance, aging resistance, and non-destructive assembly and disassembly. The pen cap evenly distributes the locking pressure and assists in ink guidance, ensuring precise ink control even when the pen tip is significantly split. The adjustment screw can independently control the ink output, forming a dual-loop control with the pen feed air intake adjustment. The modular design allows for individual replacement of each component, enhancing practicality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 The attached figure is a schematic diagram of the adjustable ink supply structure provided by the present invention; Figure 2 The attached figure is a cross-sectional view of the adjustable ink supply structure of the pen feed provided by the present invention; Figure 3 The attached figure is an exploded view of the adjustable ink supply structure of the pen feed provided by the present invention; Figure 4 The attached figure is an exploded view from another angle of the adjustable ink supply structure provided by the present invention. Figure 5 The attached figure is a schematic diagram of the adjustable ink supply structure provided by the present invention.

[0023] Wherein: 1-Lip; 11-Main ink groove; 12-Through ink slit; 13-Lip fin; 2-Lip core; 21-First axial groove; 22-Second axial groove; 221-Bevel; 23-Ink channel; 24-Air intake channel; 25-Variable air intake gap; 26-Rib; 27-Guide groove; 28-Straight groove; 3-Adjusting screw; 4-Pen tip; 41-Ink slit; 5-Pen cap; 6-Screw. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1: See appendix Figure 1 As shown, an embodiment of the present invention discloses an adjustable ink supply structure for a pen feed, including a pen feed 1, a feed core 2, a pen tip 4, a pen stud 5, and an adjusting screw 3.

[0026] The sidewall of the feed 1 has a main ink groove 11 axially formed. The interior of the feed 1 is hollow, and its inner sidewall is threaded. The feed 1 also has an axially extending through ink slit 12, which communicates with the main ink groove 11, allowing the ink in the main ink groove 11 to be guided to the pen tip 4 through the through ink slit 12. Multiple feed fins 13 are also spaced apart on the feed 1, and the feed fins 13 are in fluid communication with the main ink groove 11, forming a capillary ink storage area around the main ink groove 11.

[0027] The tongue core 2 has a columnar structure. One end of the tongue core 2 has a radially protruding rib 26. The outer wall of the rib 26 has a threaded structure that connects with the inner wall of the pen tongue 1. The inner wall of the pen tongue 1 has an internal thread that matches the thread on the outer wall of the rib 26. The other end of the tongue core 2 has a guide groove 27, and a slotted groove 28 is formed on the end face of this end. The two sides of the tongue core 2 have a first axial groove 21 and a second axial groove 22, respectively. An inclined surface 221 is formed on the second axial groove 22.

[0028] During assembly, the tongue core 2 is first screwed into the interior of the pen tongue 1 through the threaded structure on the outer wall of the rib 26, so that the rib 26 of the tongue core 2 is threadedly connected to the inner wall of the pen tongue 1. At this time, the first axial groove 21 of the tongue core 2 and the inner wall of the pen tongue 1 form an ink channel 23, which is connected to the main ink groove 11 of the pen tongue 1; the second axial groove 22 of the tongue core 2 and the inner wall of the pen tongue 1 form an air intake channel 24, and the inclined surface 221 on the second axial groove 22 forms a variable air intake gap 25 with the inner wall of the pen tongue 1.

[0029] Then, attach the pen tip 4 to the outer surface of the pen feed 1 on the side with the main ink groove 11, and make the ink-drawing slit 41 on the pen tip 4 precisely aligned with the main ink groove 11.

[0030] Finally, the pen clip 5 is placed over the outside of the pen tip 4, and the two are locked together to the outer wall of the feed 1 by a screw 6 passing through the pen clip 5 and the pen tip 4. The pen clip 5 is a full-coverage structure, extending to the middle of the pen tip 4.

[0031] Furthermore, the adjusting screw 3 extends laterally through both sides of the through-type ink slit 12 of the feed 1 and is threadedly connected to the side walls. The end of the feed 1 furthest from the writing part is used to connect to the pen grip (not shown in the figure).

[0032] The working principle and process of this invention are as follows: When adjusting the ink supply, use a general-purpose tool such as a flathead screwdriver to insert into the flat groove 28 on the end face of the tongue core 2 and rotate the tongue core 2. Since the tongue core 2 and the pen feed 1 are connected by a thread, the rotational motion is converted into a precise linear movement of the tongue core 2 along the axis of the pen feed 1.

[0033] When the tongue core 2 moves axially, its inclined surface 221 moves synchronously, thereby changing the flow area of ​​the variable air intake gap 25 between the inclined surface 221 and the inner wall of the tongue 1: When the tongue core 2 rotates towards the pen tip 4, the inclined surface 221 moves accordingly, the flow area of ​​the variable air intake gap 25 increases, the amount of air entering the ink cavity increases, the air pressure in the ink cavity rises, and the amount of ink flowing out increases, resulting in a wetter writing surface. When the tongue core 2 is rotated away from the pen tip 4, the inclined surface 221 moves in the opposite direction, the flow area of ​​the variable air intake gap 25 decreases, the amount of air entering the ink cavity decreases, the air pressure in the ink cavity decreases, the amount of ink flowing out decreases, and the writing becomes drier.

[0034] By rotating the tongue 2, users can continuously and precisely adjust the ink supply according to the ink characteristics, paper type, and personal writing habits.

[0035] Meanwhile, the user can also rotate the adjusting screw 3. Since the adjusting screw 3 runs horizontally through both sides of the through ink slit 12 and is threaded to both sides, rotating the adjusting screw 3 can slightly change the width of the through ink slit 12, thereby independently and precisely controlling the amount of ink flowing to the pen tip 4. This forms a dual-path coordination with the air intake adjustment of the tongue core 2, realizing full control of the ink supply system.

[0036] The pen tip 5 plays an auxiliary role in guiding ink during writing: when the pen tip 4 splits significantly, the structure of the pen tip 5 extending to the middle of the pen tip 4 can still provide stable and continuous auxiliary ink guidance, ensuring that there is no ink overflow or paper flooding when writing with a large flow of ink. At the same time, the pen tip 5 disperses the locking pressure through the screw 6, avoiding local stress from damaging the pen tip 4.

[0037] The fins 13 of the pen tip form a capillary ink storage area around the main ink reservoir 11, which provides a buffer for ink supply during writing and ensures that the pen tip 4 is continuously inked when writing at high flow rates and speeds; the gaps between the fins can store excess ink to prevent the pen tip 4 from dripping ink.

[0038] When disassembly and maintenance are required, loosen screw 6 to remove pen cap 5 and nib 4 from the feed 1, and unscrew the feed core 2 for cleaning or replacement. All parts are disassembled and assembled without damage to any structure. Thus, by rotating the feed core 2, the user can linearly adjust the ink supply between extremely dry and extremely wet conditions to meet the needs of different writing scenarios.

[0039] Example 2: This invention discloses a fountain pen, including the aforementioned adjustable nib ink supply structure.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An adjustable ink supply structure for a pen feed, characterized in that, include: The pen tongue (1) has a main ink groove (11) axially opened on the side wall of the pen tongue (1). The tongue core (2) is threaded inside the pen tongue (1) and can move axially along the axis of the pen tongue (1); a first axial groove (21) and a second axial groove (22) are respectively provided on both sides of the tongue core (2); an ink channel (23) is formed between the first axial groove (21) and the inner wall of the pen tongue (1); the ink channel (23) is connected to the main ink groove (11); an air intake channel (24) is formed between the second axial groove (22) and the inner wall of the pen tongue (1), and an inclined surface (221) is formed on the second axial groove (22); a variable air intake gap (25) is formed between the inclined surface (221) and the inner wall of the pen tongue (1). When the tongue core (2) moves axially, the inclined surface (221) changes the flow area of ​​the variable air intake gap (25) to adjust the air intake volume and thus control the ink supply volume.

2. The adjustable ink supply structure for a pen feed according to claim 1, characterized in that, An axially extending through ink slit (12) is provided on the pen tongue (1), and the through ink slit (12) is connected to the main ink groove (11).

3. The adjustable ink supply structure for a pen feed according to claim 2, characterized in that, It also includes an adjusting screw (3), which extends laterally through both sides of the through-type ink slit (12) and is threadedly connected to the two sides.

4. The adjustable ink supply structure for a pen feed according to claim 1, characterized in that, The nib (1) is provided with a plurality of nib fins (13) spaced apart, and the nib fins (13) are in fluid communication with the main ink groove (11).

5. The adjustable ink supply structure for a pen feed according to claim 1, characterized in that, One end of the tongue core (2) has a radially protruding rib (26), the outer wall of the rib (26) has a threaded structure that is threaded to the inner wall of the pen tongue (1), and the other end of the outer wall has a guide groove (27).

6. The adjustable ink supply structure for a pen feed according to claim 5, characterized in that, A groove (28) is formed on the end face of the tongue core (2) away from the rib (26).

7. The adjustable ink supply structure for a pen feed according to claim 1, characterized in that, It also includes a pen tip (4), which is attached to the outer surface of the pen tongue (1) on the side with the main ink groove (11), and the pen tip (4) has an ink-drawing slit (41) corresponding to the main ink groove (11).

8. The adjustable ink supply structure for a pen feed according to claim 7, characterized in that, It also includes a pen clip (5), which covers the outside of the pen tip (4) and secures the pen tip (4) to the outside of the pen feed (1) by a screw (6).

9. The adjustable ink supply structure for a pen feed according to claim 1, characterized in that, The material of the pen tongue (1) is titanium alloy or titanium alloy-based composite material.

10. A fountain pen, characterized in that, Includes the adjustable ink feed structure as described in any one of claims 1-9.

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