JPH034552Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Purpose of the invention This invention relates to a pen body that is effective for fine writing, which maintains abundant ink flow and a constant thin handwriting width, and gives a hard and smooth writing feel. The present invention provides a pen body that not only satisfies handwriting performance but also is suitable for high-speed machine writing.

Conventionally, various proposals have been disclosed and put into practical use as pen bodies of a type in which a core is loosely inserted into a cylinder to form an ink passage between the core and the inner wall of the cylinder.

Examples of pens that have been put into practical use include a pen body in which the front end of the core slightly protrudes from the writing tip due to a weight added to the rear of the core inserted loosely into a thin tube, or a pen body in which the rear end of the core is made to protrude slightly from the writing tip. Pen bodies are mainly used that have a structure that allows the core to move in and out due to the effect of repulsion when brought into contact with a porous elastic body such as a porous elastic body.

In the former pen body mentioned above, the core body is for guiding ink and imparting a cleaning effect, and does not function as the main body of the writing tip during writing. This is one of the reasons why ink flow and writing feel are not stable in a non-vertical state. In addition, with the latter type of pen body, the core body oscillates when writing, making it difficult to obtain a stable writing feeling, and the ink flow rate also varies depending on the compression and decompression of the porous elastic body or depending on the writing angle. It gives a lot of variation. Furthermore, the impact resilience of the porous elastic body inevitably decreases due to repeated stress and over time, making it difficult to maintain the initial performance. Furthermore, in all of the above-mentioned pen bodies, only the tip of the core body does not function as a writing tip, but the front end of the tube body serves as a writing tip. Therefore, the writing line width is influenced by the outer diameter of the tube body and is limited to fine writing. is giving.

Japanese Patent Publication No. 49-19409 discloses an attempt to make a core protrude from the tip of a cylindrical body separately from the pen body as described above. In the above method, a slit is provided at the front of a synthetic resin rod and this is used as a writing tip, and the slit at the upper end is communicated with an annular groove formed in the rod to draw out ink from the groove. In addition, there is a limit to the amount of ink that can be stored in the groove, and there is a limit to the introduction of ink from the opening surface at the end of the slit, making it difficult to flow out the ink abundantly from the writing tip. Considering the installation space and desired elastic recovery properties, there is a limit to reducing the diameter of the core, and it is difficult to provide a practical pen body that maintains a thin writing line width.

The present invention provides a pen body that maintains a constant narrow writing line width and abundant ink flow, which cannot be achieved with the conventional pen body described above, and provides a hard, smooth, and stable writing feeling.

(b) Structure of the idea The configuration of the present invention will be explained below with reference to the drawings.

In the pen body 1 of the present invention, the core body is loosely inserted into the cylindrical body,
It is a type of pen body that forms an ink passage between the inner wall of the cylinder and the core body 3 has a slit-shaped ink groove 3-1 arranged in the axial direction at the front part, and the tip has a substantially hemispherical shape. The front end of the cylindrical body 2 is bent in the axial direction along the hemispherical surface of the tip of the core 3, so that a small portion of the hemispherical tip of the core 3 protrudes, and the remaining portion is bent. The requirement is that the slit-shaped ink groove 3-1 is communicated with the ink passage 4.

The core body 3 in the above configuration functions as a writing tip as well as extracting ink, and influences the durability, writing feel, etc. of the pen body. Hard and rigid small-diameter wire bodies, specifically stainless steel, brass, nickel silver, carbide, piano wire, metal wires such as aluminum, ceramic and other inorganic wires, acrylic,
Hard plastic materials such as polyacetal, polyester, polyamide, and other engineering plastics are effective, and various cross-sectional shapes can be applied, but the outer diameter is 0.1 to 1.8 mm, preferably 0.3 to 1.8 mm.
Selected from rods with a circular cross section of 0.9 mm, with fine unevenness formed on the outer peripheral surface as necessary,
A material with a roughened surface may be used as appropriate.

The slit-shaped ink groove 3-1 has a groove width in which capillary action functions, that is, a width in the range of 0.01 to 1.0 mm, depending on the physical properties such as the outer diameter of the core, the viscosity of the ink, and the surface tension. Approximately 1 to 8 pieces are disposed by cutting or molding over an appropriate length in the direction (selected from the range of 0.1 to 10 mm) to a depth that reaches the axis or the vicinity of the axis. Specifically, examples are shown in FIGS. 1 to 7.

The tip of the core body 3 is formed into a substantially hemispherical shape by cutting or the like to provide a smooth writing feel and ink flowability at various writing angles, and to function effectively in terms of durability. The tip of the core body 3 is plated using a known method, welded with an iridium alloy, osmium alloy, etc., or chromium nitride, chromium carbide, boron layer, etc. is formed by vapor deposition to improve wear resistance, hardness, The writing quality etc. can be improved.

As the cylinder 2, cylinders with internal spaces of various cross-sectional shapes can be used depending on the purpose, and cylinders with a large number of minute protrusions or slit-shaped grooves provided in the axial direction as necessary on the inner wall can be used. is used as appropriate. Specific examples include metal materials such as stainless steel, aluminum, brass, and nickel silver, synthetic resins such as polyacetal, polyamide, polyolefin, vinyl chloride, and styrene, and ceramic materials.

The ink passage 4 between the inner wall of the cylinder 2 and the inserted core 3 is set to have a width of 0.01 to 1.0 mm depending on the physical properties of the ink.

In the present invention, in a combination in which the core body 3 is inserted into the cylinder body 2, the front end of the cylinder body 2 is bent in the axial direction along the hemispherical surface at the tip of the core body, and the hemispherical shape at the tip of the core body is bent. Requires a configuration in which a small portion protrudes. Here, the inner surface of the front end of the cylinder 2 may be in a non-contact state with the hemispherical surface (see FIGS. 1 and 2), and the ink passage 4 may be communicated to the tip surface of the core 3, or (See FIGS. 6 and 7).

The inner core body 3 is supported and fixed by at least two or more inward protrusions 5 formed by pressing from the outer surface of the cylinder body 2, and movement in the axial direction is inhibited (the first
(see Figure 5). The supporting and fixing of the core body 3 is not limited to the above-mentioned specifications, and can be carried out by interposing an appropriate holder.

Specific example: After cutting the tip of a stainless steel linear body with an outer diameter of 0.4 mmφ and a total length of 10 mm to form a hemispherical shape, four slit-shaped ink grooves 3-1 reaching the axis are formed on the front of the linear body. [Cross shape shown in Figure 2: Groove width (0.04
mm), axial length (0.8 mm)] with a cutter, chrome plating is performed using a conventional method to obtain the core 3, which has an outer diameter of 0.8 mmφ (inner diameter 0.5 mmφ).
The front end is inserted into a stainless steel pipe with the front end protruding by 0.2 mm, and then the outer circumference of the front end of the pipe is uniformly reduced in diameter in the axial direction using a processing tool, and an inward protrusion 5 (first Figure 1,
5) to obtain a pen body 1.

The pen body 1 includes an ink guiding core 7 (e.g., a resin-processed or heat-sealed fiber bundle, a plastic molded product having continuous pores, etc.) having ink supply and storage functions, as illustrated in FIG. The holder 6 is inserted and fixed into the front part of the holder 6 which is attached to the rear part of the holder 6, and connected to the guide core 7 for practical use.

(c) Effects of the device The slit-shaped ink grooves, which open in the axial direction and front end surface of the outer surface of the front end of the core, and reach the axis and the vicinity thereof, prevent ink between the inner wall of the cylinder and the circumferential surface of the core. The ink introduced into the ink passage from the ink storage section is introduced into the ink groove opened in the axial direction of the core and supplied to the front end surface. Compared to the introduction from the cut end opening surface disclosed in the publication, much more abundant ink can be stably flowed out to the writing tip. Furthermore, there is no need for the provision of an annular groove for ink storage as seen in the same publication and the elastic recovery function provided by this, and therefore the diameter of the core can be made as thin as possible, or alternatively, as described above, Compared to pen bodies of the type that elastically support the rear end of the core or provide a weight at the rear of the core to swing the core in and out of the shaft, the core is attached to the center of the shaft. It is supported and fixed, providing a stable writing feel and ink flow.

The configuration in which a part of the hemisphere is used as a writing tip and the front end of the cylinder whose diameter is reduced along the hemisphere works together with the function of the slit-shaped ink groove to lead out ink to the hemisphere. To provide non-directional ink flow and a comfortable writing feeling at various writing angles. Further, the front end of the cylinder covers the tip of the core, and together with the hemispherical shape of the core, prevents the slit-shaped ink groove from expanding or breaking due to writing pressure.

By changing the combination of the size of the slit-shaped ink grooves, the number of ink passages, and the width of the grooves, it is possible to control the outflow of a variety of inks with different physical properties such as ink viscosity and surface tension, depending on the purpose. It is extremely effective in practice as a pen body for handwriting or machine writing.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of the pen body of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A, FIG. 5 is a cross-sectional view taken along the line B-B, The figure is a cross-sectional view of another example taken along the line A-A, FIG. 6 is a longitudinal cross-sectional view of the main part of another example, FIG. 7 is a cross-sectional view taken along the line C-C, and FIG. 8 is a pen according to the present invention. FIG. 3 is a vertical cross-sectional view of a main part of the writing tip with the writing tip attached to the body. 1... Pen body, 2... Cylinder body, 3... Core body, 3-
1...Slit-shaped ink groove, 4...Ink passage,
5...Inward projection, 6...Holder, 7...Ink guiding core.

Claims (1)

[Scope of utility model registration request] This is a type of pen body in which the core is loosely inserted into the cylinder to form an ink passage between it and the inner wall of the cylinder, and the core has a slit-shaped ink groove arranged in the axial direction at the front part. In addition, the tip is formed into a substantially hemispherical shape, and the front end of the cylinder is bent in the axial direction along the hemispherical surface of the tip of the core, so that a small portion of the hemispherical tip of the tip of the core protrudes. The pen body has a slit-like ink groove in the remaining part and communicates with the ink passage.