JP2002086974A - Metal pen point for writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal pen point for a writing utensil, which develops favorable ink flow, can be used on any writing surface, has a higher forming accuracy and has the economical high effect on the production. SOLUTION: This pen point consists of a tip 2 and an ink inductive core 3. The tip is formed through the cold forging work of a thin metal plate having the thickness of 0.05 to 0.2 mm into the same body-like mode consisting of a hemispherical head portion 2a, a tubular barrel portion 2b having a same outer diameter as the rear end outer diameter of the head portion and a rear end opening part 2c having a same outer diameter as the rear end outer diameter of the tubular barrel portion and, at the same time, has respectively and independently a mirror-finished surface at the hemispherical head portion and a part 2e to be inserted ranging from the rear end opening part to the hemispherical inner surface part 2d of the back of the hemispherical head portion and a plurality of chamfered ink vent holes having the groove width or bore of 0.03 to 0.2 mm at the hemispherical head portion. The ink inductive core 3 is formed into a rod-like body having a tip shape, which can capillarily shift ink to the axis line direction of the core. Further, the ink inductive core is inserted in the part to be inserted. Furthermore, the tip of the inductive core is inserted so as to closely contact with the hemispherical inner surface part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a metal nib for a writing instrument.

[0002]

2. Description of the Related Art For example, a writing instrument of Japanese Patent Publication No. 42-21603, a pen core of Japanese Utility Model Publication No.
Non-directional pen body disclosed in JP-A-5-91469
No. 77 writing nibs and water-based ballpoint pens have the following problems. 1. In the writing instrument of Japanese Patent Publication No. 42-21603, a sufficient ink flow cannot be obtained because the ink through hole has a very small diameter of about 0.01 mm. Since a large number of extremely small diameter ink through holes are formed, the cost is increased. When hard chrome plating is performed, hardened chrome plating is performed so that a large number of extremely small-diameter ink through holes are not blocked, so that the yield is low and the cost is increased. Since only the ink holes are formed, the writing feel is poor due to the edges of the holes scratching the paper during writing. 2. The pen core disclosed in Japanese Utility Model Application Laid-Open No. 191380/1985 has the same problems as 1 and 2 above because a large number of fine holes (30 to 50 μm in diameter) are formed. If a metal thin plate is formed into a curved surface at the tip end surface and only micro holes are formed, the writing feel is poor due to the rough surface of the metal thin plate and the edge of the hole scratching the paper during writing. 3. In the non-directional pen body disclosed in Japanese Utility Model Application Laid-Open No. 60-91469, a sufficient ink flow cannot be obtained because the groove width of the groove cutting crossing at the apex of the pen tip which is an ink passage is as narrow as 0.02 to 0.05 mm. . Since the ink passages intersect at the apex, the paper is scratched at the intersection at the time of writing, and a paper jam occurs, resulting in poor ink ejection. When hard chrome plating or the like is performed, hard chrome plating or the like is performed so as not to block a narrow slit groove serving as an ink passage, so that the yield is low and the cost is increased. 4. In the writing nib of JP-A-5-318977, it is difficult to obtain a sufficient ink flow because the length of the ink groove having the groove width L in the axial direction becomes a resistance to the ink flow. The molding die is precise, and the mold cost is high. Management costs are required for precision molding. 5. Water-based ballpoint pens have a large number of components (chip body, ball, etc.) and are costly to process. If the writing surface is so smooth that the ball does not rotate, writing cannot be performed because rotation of the ball to draw ink cannot be obtained.

[0003]

The first problem to be solved by the invention is that, first, the ink flow is good, the writing surface can be selected, the molding accuracy is high, and the economical effect on production is low. Secondly, high metal writing nibs for writing instruments,
Thirdly, a metal nib for writing instruments with a smooth writing feel and no paper jams. Thirdly, a metal nib for writing instruments with high follow-up properties (interruption of ink during shorthand writing) and a thin writing line width. To provide.

[0004]

In order to achieve the above-mentioned object, the present invention comprises a chip and an ink guide core, and the chip is formed by cold forging a thin metal plate having a thickness of 0.05 to 0.2 mm. And a hemispherical head portion, a cylindrical trunk portion having the same outer diameter as the rear end outer diameter of the head portion, and a rear end opening having the same outer diameter as the rear end outer diameter of the cylindrical trunk portion. And a hemispherical head having a mirror-like surface with a polished and / or plated hemispherical head portion, which extends from the rear end opening to a hemispherical inner surface of the back surface of the hemispherical head portion; The head portion has a plurality of chamfered ink through-holes each having a groove width or hole diameter of 0.03 to 0.2 mm independently of each other.
The ink is formed in a tip shape capable of moving the capillary in the axial direction and being closely inserted into the inserted portion, and an ink guide core is provided in the inserted portion, and the tip of the ink guide core is the hemispherical inner surface portion. And is inserted closely. Further, the present invention is characterized in that the surface of the hemispherical head portion is a mirror-like surface plated with nickel. Further, the present invention is characterized in that the tip of the hemispherical head portion has a diameter of 0.3 to 0.6 and the ink through hole has a hole diameter of 0.08 to 0.18 mm.

The size of the chip in the present invention is 0.5 to 2.0 mm in outer diameter and 3 to 15 mm in overall length, and the material of the chip is stainless steel, brass, or other known metal materials. The arrangement of the ink through-holes is arranged radially except for the top part of the head part, arranged in a scattered manner except for the top part of the head part, and arranged radially including the top part of the head part. In this case, the shape of the ink through-hole may be either a long hole or a round hole. The formation of the ink through-hole may be before, during or after the cold heading process,
Processing methods include press processing, grooving with a slitter,
Drilling with a drill or other known processing methods. The mirror finishing of the surface of the hemispherical head portion may be any of polishing finish, plating finish, polishing and plating finish. As the plating process, nickel plating, chrome plating, and other plating finishes that contribute to the reduction of writing resistance are performed. The ink guide wick may be any type in which the ink can move in the capillary direction in the axial direction, and may be a synthetic resin rod having an ink passage in the axial direction, or a porous bundled fiber. It may be composed of a body. The shape of the tip of the ink guide core may be any shape as long as it can be inserted closely (including both a state where there is no gap and a state where there is a gap capable of expressing a capillary phenomenon) in the inserted portion of the chip. For example, it has a hemispherical shape, a chamfered shape at the tip, and the like.

A method of manufacturing such a metal nib will be described below. Step 1: Cold forging a thin metal plate to obtain a hemispherical head portion, a cylindrical trunk portion having the same outer diameter as the rear end outer diameter of the head portion, and the same outer diameter as the rear end outer diameter of the cylindrical trunk portion. Are formed step by step in the same shape having the rear end opening. In the process, a plurality of ink through-holes are independently formed in the hemispherical head portion, and each ink through-hole is chamfered. Second step The surface of the hemispherical head is polished and / or plated to a mirror finish. Third Step The ink guide core is inserted into the inserted portion of the chip with the tip of the ink guide core being in close contact with the inner surface of the hemisphere.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an embodiment of a metal nib for a writing implement according to the present invention. And an ink guide core 3 made of synthetic resin inserted into the inserted portion 2e. The chip 2 is formed by cold forging a thin metal plate having a thickness of 0.1 mm to form a hemispherical head portion 2a, a cylindrical body portion 2b having the same outer diameter as the rear end outer diameter of the head portion 2a, It is formed in the same body form comprising the rear end outer diameter of the same outer diameter as the rear end outer diameter of the body part 2b, the outer diameter is 1.0 mm, and the total length is 7.2 mm. In the drawing, the hemispherical head portion 2a
Of the top 2a1 is 0.5 mm, and a line having a line width of 0.45 mm can be written.

In the chip 2, an inserted portion 2e extending from the rear end opening 2c to the hemispherical inner surface 2d on the back surface of the hemispherical head 2a is formed.
In this example, six ink through-holes 2f each having a groove width of 0.065 mm are formed independently and radially. The long ink holes 2f are arranged so as to surround the central top 2a1, and the ink holes 2f are counterbored and the edges are chamfered. The surface of the hemispherical head portion 2a is polished and pre-plated, and then nickel-plated to be mirror-finished, and has a nickel plating thickness of 0.005 to 0.01 mm.

The ink guide core 3 is an extruded product made of a synthetic resin having an ink passage 3a through which the ink can move in a capillary direction in the axial direction. The tip 3b where the ink passage 3a is exposed is located inside the inserted portion 2e. Is formed in a hemispherical shape that can be in intimate contact with the hemispherical inner surface portion 2d. The ink guide core 3 has a tip 3b at the inserted portion 2e in the chip 2 and a hemispherical inner surface 2d at the tip 3b.
The ink that has been inserted into the ink passage 3a until it comes in close contact with the ink passage 3a and that has been capillary-moved through the ink passage 3a is moved out of the ink passage hole 2f in the hemispherical inner surface 2d that is in close contact with the tip end portion 3b by being drawn out. .

FIGS. 4 to 6 show another embodiment of the metal nib for a writing implement of the present invention. The configuration is basically the same as that of the embodiment of FIG. 1 described above. ,
The description of the common configuration will be omitted by applying the same reference numerals, and different configurations will be described. Hemispherical head part 2 of chip 2
a, six ink through-holes 2f each having a hole diameter of 0.15 mm are independently arranged at an equiangular shape, and each of the round-hole-shaped ink through-holes 2f is formed at the top of the center. 2a
1 are arranged in an inner / outer double shape so as to surround 1.

FIG. 7 illustrates another embodiment of the metal nib for a writing instrument according to the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and different configurations will be described. The hemispherical head portion 2a of the chip 2 has an inner and outer double ink passage 2f having a hole diameter of 0.15 mm, and further three ink passage holes 2f having the same hole diameter.
Are formed in an equiangular manner, and the round holes 2f are arranged in an inner / outer triple so as to surround the center top 2a1.

FIG. 8 illustrates another embodiment of the metal nib for a writing instrument according to the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and different configurations will be described. The hemispherical head portion 2a of the chip 2 has an inner and outer double ink through hole 2f having a hole diameter of 0.10 mm, and further six ink through holes 2f having the same hole diameter.
Are arranged concentrically, and each of the round ink holes 2f is arranged in an inner and outer triple shape so as to surround the center top 2a1.

FIG. 9 illustrates another embodiment of the metal nib for a writing instrument according to the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and different configurations will be described. In the hemispherical head portion 2a of the chip 2, an ink through hole 2f is formed at the center top 2a1, and around the ink through hole 2f at the top 2a1,
Each of the ink through holes 2f is arranged in an inner and outer double shape. The diameter of the ink passage 2f at the top 2a1 is 0.10 mm,
The diameter of each of the surrounding ink passage holes 2f is 0.15 mm.

FIG. 10 illustrates another embodiment of the metal nib for a writing implement of the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and different configurations will be described. In the hemispherical head portion 2a of the chip 2, a round hole-shaped ink passage 2f is formed at the center top 2a1, and a long hole-shaped ink passage 2f is formed around the ink passage 2f at the top 2a1. Are radially arranged, and round holes 2f are formed between the long holes 2f. Round hole ink passage 2f and long hole ink passage 2 at top 2a1
The hole diameter of each ink passage 2f between f is 0.10 mm.

FIG. 11 illustrates another embodiment of the metal nib for a writing implement of the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and different configurations will be described. The hemispherical head portion 2a of the chip 2 has a small radius around the central top 2a1 and a large radius around the top 2a1. In the drawing, the length of the hemispherical head portion 2a is 0.55 mm,
The radius of the top 2a1 is 0.35 mm, the radius around the top 2a1 is 0.80 mm, and the line width is 0.35 mm.
Can be written. By setting the radius of the top 2a1 to an appropriate numerical value, a desired line width can be written. For example, by further reducing the radius of the top 2a1, a line with a thin line width can be written. The brush tip can be enlarged by increasing the radius around the top 2a1.

FIG. 12 illustrates another embodiment of the metal nib for a writing implement of the present invention. The configuration is basically the same as that of the embodiment of FIG. The description of the configuration is omitted by applying the same reference numerals, and different configurations will be described. The tip 2 is formed in such a manner that the tip 2 also serves as a base by expanding the rear side from the tip of the brush.
It can be directly attached to the barrel.

[0017]

A. Effects of the Invention According to the first aspect, the ink flow is good, the writing surface is selected, and the molding accuracy is high, and the economical effect on production is high. Therefore, it is possible to reliably write on a smooth writing surface that does not rotate with a ball, and it has a copying ability equivalent to a ballpoint pen. B. According to the second aspect, a smooth brush feeling is obtained, and there is no paper jam. C. According to the third aspect, there is no break in the ink at the time of shorthand writing and the like, which has a high follow-up property, is useful for shorthand writing and the like, and can write a thin line width.

[Brief description of the drawings]

FIG. 1 is a front view illustrating one embodiment of a metal nib for a writing implement of the present invention.

FIG. 2 is an enlarged side view.

FIG. 3 is an exploded view showing a partial cross section along the line (3)-(3) in FIG. 2;

FIG. 4 is a front view illustrating another embodiment of the metal nib for a writing instrument of the present invention.

FIG. 5 is an enlarged side view.

FIG. 6 is an exploded view showing a partial cross section along the line (6)-(6) in FIG. 5;

FIG. 7 is an enlarged side view illustrating another embodiment of the metal nib for a writing instrument of the present invention.

FIG. 8 is an enlarged side view illustrating another embodiment of the metal nib for a writing instrument of the present invention.

FIG. 9 is an enlarged side view illustrating another embodiment of the metal nib for a writing instrument of the present invention.

FIG. 10 is an enlarged side view illustrating another embodiment of the metal nib for a writing instrument of the present invention.

FIG. 11 is a partially enlarged front view illustrating another embodiment of the metal nib for a writing instrument of the present invention.

FIG. 12 is a partial front view illustrating another embodiment of the metal nib for a writing instrument of the present invention.

[Explanation of symbols]

 1 Pen Tip 2 Tip 2a Hemispherical Head 2a1 Top 2b Cylindrical Body 2c Rear End Opening 2d Hemispherical Inner Surface 2e Inserted Part 2f Ink Through Hole 3 Ink Guiding Core 3a Ink Passage 3b Tip

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Shimizu 59-115 Sakanaka, Kanazu-cho, Sakai-gun, Fukui Fukui Tsubashi Co., Ltd. (72) Inventor Tatsuya Kida 59-115 Sashinaka, Kanazu-cho, Sakai-gun, Fukui Fukui Tack Screw Co., Ltd. F term (reference) 2C350 GA02 HA05 HA16 NA00 NA13 NE05 NE07 NE09

Claims (3)

[Claims] 1. A chip comprising: a chip and an ink guide core; a chip formed by cold forging a metal sheet having a thickness of 0.05 to 0.2 mm to form a hemispherical head portion and an outer diameter of a rear end of the head portion; A cylindrical body portion having the same outer diameter as that of the cylindrical body portion, and a rear end opening portion having the same outer diameter as a rear end outer diameter of the cylindrical body portion, and a hemispherical head portion surface is polished. And / or a plated mirror-finished surface that is inserted from the rear end opening to the inner surface of the hemispherical surface on the back surface of the hemispherical head, and a groove width or hole diameter of 0.03 to 0.2 mm in the hemispherical head. A plurality of chamfered ink through-holes independently of each other, and the ink guide core is formed in a tip shape that allows ink to move in a capillary direction in the axial direction and that can be closely inserted into the inserted portion. An ink guiding core is provided in the inserted portion, and a tip of the ink guiding core corresponds to the hemispherical inner surface. Writing instruments metal nib, characterized in that it is inserted into contact shape. 2. The metal nib for a writing instrument according to claim 1, wherein the surface of the hemispherical head portion is mirror-finished with nickel plating. 3. The writing instrument according to claim 1, wherein the tip of the hemispherical head portion has a radius of 0.3 to 0.6 and the ink hole has a diameter of 0.08 to 0.18 mm. Metal nib.