JP2003320785A - Nib and writing instrument using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nib which has a soft writing feeling, which has sufficient ink dischargeability without omission of a handwriting at a high-speed writing time and which can satisfy to eliminate a difference in a handwriting width according to a writing direction and to prevent the distal end of a core from being collapsed even in the case of a strong writing pressure for a long period. <P>SOLUTION: The nib 1 comprises the core 2 made of a resin working material of a fiber, and a holder 3 made of an injection molding of a synthetic resin for holding the outer peripheral surface of the core 2. In this nib, a flexible peripheral coating part 31 covering the outer peripheral surface near the distal end of the core 2 is formed at the distal end of the holder 3, and the distal end of the core 2 is projected forward from the distal end of the coating part 31. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pen tip and a writing instrument using the pen tip. More specifically, a pen tip comprising a core made of a resin processed body of fibers or a porous body of synthetic resin, and a holder made of an injection molded body of synthetic resin for holding the outer peripheral surface of the core, and the same are used. Regarding writing instruments. still,
In the present invention, "front" refers to the pen tip side, and "rear" refers to the opposite side.

[0002]

2. Description of the Related Art Conventionally, in Japanese Unexamined Patent Publication No. 7-237385, even a fibrous core is formed on the inner surface of the conical tip of a pen tip piece formed of a plurality of comb-shaped pieces made of metal or synthetic resin. The pen tip to reach is disclosed. This is a structure in which the pen tip part comes into contact with the paper surface during writing, so even if the comb tooth-like piece has elasticity, the writing feeling is harder than the fiber pen body, and there is a feeling that it scratches the paper surface. Gives a feeling of fatigue to hands and fingers when used for a long time. In addition, since the positional relationship between the opening of the ink outlet path (corresponding to the slit of the present application) and the paper surface is not constant during writing, the handwriting width varies depending on the writing direction. Further, since the ink is ejected onto the paper surface only from the ink lead-out path, the ink does not follow up at the time of high-speed writing, and the handwriting may be blurred.

Further, conventionally, there is known a nib including a core made of a resin-processed body of fibers and an outer skin made of an extrusion molded body of a synthetic resin covering the outer peripheral surface of the core. Since this is a configuration in which the outer skin is provided by extrusion molding, the thickness of the outer skin becomes uneven due to variations in the shape of the inner core and misalignment during molding between the outer skin and the inner core, and the tip of the outer skin is made thin. Setting is difficult in manufacturing. Further, in the case of a strong writing pressure, the conventional nib may be crushed at the tip of the core protruding forward from the outer cover, and the capillary gap at the tip of the core may be closed, resulting in a decrease in ink outflow. There is.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has a soft writing feeling and a sufficient ink outflow property without blurring of handwriting at high speed writing. It is an object of the present invention to provide a pen tip that has no difference in the handwriting width depending on the writing direction, and that is capable of preventing crushing of the tip end portion of the core even for a strong writing pressure for a long period of time.

[0005]

Means for Solving the Problems [1] The present invention relates to a core 2 made of a resin processed body of fibers or a porous body of synthetic resin.
And a holder 3 made of a synthetic resin injection-molded body for holding the outer peripheral surface of the core 2, wherein the tip of the holder 3 covers the outer peripheral surface of the core 2 near the tip. It is required that the flexible circumferential covering portion 31 is formed and the tip end portion of the core 2 is projected forward from the tip end of the circumferential covering portion 31 (claim 1).

[0006] The core 2 supplies ink from the rear to the tip of the core 2 which is the tip of writing, and holds the ink in the internal capillary gap to prevent the ink from falling when the pen tip is facing upward. It is a thing. The holder 3 stably holds the pen tip 1 during writing without wobbling. Since the holder 3 is made of a synthetic resin injection-molded body, it is easy to manufacture the flexible circumferential covering portion 31 so as to have a uniform thickness.

Since the tip of the core 2 projects forward from the circumferential covering portion 31, the tip of the core 2 comes into contact with the paper surface during writing. As a result, compared to the case where only the holder 3 comes into contact with the paper surface, the soft writing feeling, sufficient ink outflow without blurring of the handwriting at high speed writing, and the pen tip with no difference in handwriting width depending on the direction of the pen tip. Can be obtained at the same time.

The flexible circumferential covering portion 31 is made of synthetic resin integrally formed with the tip portion of the holder 3 and bends together with the tip portion of the center core 2 even when a strong writing pressure is applied, so that the writing is possible. In this case, the tip of the center core 2 is prevented from being crushed and at the same time a soft writing feeling is obtained. Further, when the tip of the core 2 is worn, the tip of the core 2 and the tip of the circumferential covering portion 31 come into contact with the paper surface at the same time. Writing performance can be maintained for a long time.

[2] The pen tip 1 according to claim 1,
The circumferential covering portion 31 reduces the wall thickness T of the tip portion of the holder 3 to 0.
05 mm to 0.3 mm (preferably 0.05 mm to
It is preferable that the structure is set in the range of 0.15 mm (claim 2). Accordingly, the circumferential covering portion 31 can satisfy sufficient strength and sufficient flexibility.

If the wall thickness T of the circumferential covering portion 31 is 0.05.
If it is less than mm, the strength of the circumferential covering portion 31 becomes insufficient, and when the writing pressure is strong, the circumferential covering portion 31 is largely deformed together with the tip portion of the core 2, and the tip portion of the core 2 is prevented from being crushed. Will be difficult to do. Further, the wall thickness T of the circumferential covering portion 31
Is more than 0.3 mm, sufficient flexibility cannot be obtained, and soft writing feeling cannot be satisfied.

[3] In the pen tip 1 according to claim 1 or 2, the circumferential covering portion 31 is provided at the front end portion of the holder 3 and has three to twelve in the longitudinal direction that are open forward and penetrate in the radial direction. It is preferable that the slits 32 of the book are provided at equal intervals (claim 3). Thereby, the circumferential covering portion 3
1 has sufficient flexibility that does not reduce the strength, and at the same time, the non-directionality of the pen tip in which the flexibility of the circumferential covering portion 31 does not differ depending on the orientation of the pen tip is obtained.

[4] The pen tip 1 according to claim 1,
It is possible to set a longitudinal protruding length L at which the tip end portion of the core 2 projects from the tip end of the circumferential covering portion 31 to be equal to or smaller than the inner diameter of the tip end opening portion of the circumferential covering portion 31 (claim 4). Preferably, by doing so, it is possible to prevent bending of the tip of the core 2. If the protruding length L in the longitudinal direction in which the tip of the core 2 projects from the tip of the circumferential cover 31 is larger than the inner diameter of the tip opening of the circumferential cover 31, the core 2 is subjected to strong writing pressure. There is a risk of bending the tip of the.

[5] In the pen tip 1 according to claim 1,
It is preferable that the inner surface of the circumferential covering portion 31 and the outer surface of the core 2 are not fixed (claim 5).

As a result, since the core 2 is in a free state inside the circumferential covering 31, the tip of the core 2 slightly retreats with respect to the circumferential covering 31 during strong writing pressure.
It is possible to further prevent the tip portion of the core 2 from being crushed.

[6] The pen tip 1 according to claim 1,
It is preferable that the tip portion of the core 2 made of a resin-processed body of fibers is loosened (claim 6). By loosening the tip of the core 2 made of a resin processed body of fibers, the connection between the fibers at the tip of the core 2 due to the resin processing is released, and a soft writing feel like a writing pen tip is obtained. can get.

[7] In the pen tip according to claim 1, the tip of the core 2 is cut and processed (claim 7).
Is preferred. By cutting the tip of the core 2, the tip of the core 2 is added with flexibility in the radial direction.
A softer writing feeling can be obtained.

[8] Further, according to the present invention, an ink retaining member 43 for temporarily retaining overflow ink according to a pressure increase in the ink tank 42 is provided between the pen tip 1 and the ink tank 42. A writing instrument 4 in which the nib 1 is a resin core of a fiber or a porous core of a synthetic resin.
And a holder 3 made of an injection-molded body of synthetic resin for holding the outer peripheral surface of the core 2, and a flexible circumferential coating covering the outer peripheral surface of the holder 3 near the tip of the core 2 at the tip portion of the holder 3. A portion 31 is formed, the tip of the core 2 is projected forward from the tip of the circumferential covering portion 31, and the core 2 is projected rearward from the rear end of the holder 3, It is required that the core 2 protruding rearward from the end is inserted into a center hole 43a penetrating the axial center of the ink retaining member 43 (claim 8). With the above structure, a direct liquid type writing instrument that achieves the effects of the first aspect is obtained.

[0018]

[9] Further, according to the present invention, the ink occlusion body 5 made of a fiber processed body or a porous body is provided behind the pen tip 1.
A writing instrument (5) provided with a core (2), wherein the pen tip (1) is made of a fiber resin processed body or a synthetic resin porous body.
And a holder 3 made of an injection-molded body of synthetic resin for holding the outer peripheral surface of the core 2, and a flexible circumferential coating covering the outer peripheral surface of the holder 3 near the tip of the core 2 at the tip portion of the holder 3. A part 31 is formed, the tip of the core 2 is projected forward from the tip of the circumferential covering part 31, and the core 2 is projected rearward from the rear end of the holder 3 to It is a requirement that the rear end portion of the core 2 protruding rearward from the end is connected to the front end surface of the ink occlusion body 52 in a piercing manner (claim 9). With the above configuration, a batting type writing instrument that achieves the effect of the first aspect is obtained.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

(First Embodiment of Nib) FIGS. 1 to 6 show a first embodiment of the nib 1 of the present invention. The pen nib 1 of this embodiment is a fiber resin processed body (for example, a polyester fiber resin processed body) or a synthetic resin porous body (for example, a communicating porous polymer resin sintered body or foam). And a holder 3 made of an injection molded body of synthetic resin (specifically, polyacetal resin).

The core 2 is a rod-shaped body having a circular cross section, and the outer shape of the core 2 is a small-diameter portion 2 having a convex curved tip.
1, a large diameter portion 22 formed behind the small diameter portion 21, and a step portion 23 formed between the small diameter portion 21 and the large diameter portion 22,
Obtained by grinding. The small diameter portion 21 of the core 2
The outer diameter of the tip portion of the
The outer diameter of is set to 1.5 mm.

The outer shape of the holder 3 is composed of a tapered front portion, a flange portion formed behind the tapered front portion, and a mounting rear portion formed behind the flange portion. A mounting hole 33 is provided in the holder 3 in the longitudinal direction.

A flexible circumferential covering portion 31 is integrally formed at the tip of the holder 3. The circumferential covering portion 31
Is set to be thinner than the other portions of the holder 3. The outer diameter of the tip of the circumferential covering portion 31 is 1.2 mm.
And the inner diameter of the tip of the circumferential covering portion 31 is 1
The thickness T of the circumferential covering portion 31 is set to 0.
It is set in the range of 08 mm to 0.12 mm.

The circumferential covering portion 31 is provided with a slit 32 extending in the longitudinal direction and penetrating in the radial direction and opening forward. As a method of forming the slit 32,
For example, a method such as a slitting process with a cutter or a method obtained by injection molding may be used. Specifically, four slits 32 are provided in the circumferential covering portion 31 at equal intervals. Further, the groove width of the slit 32 is set to 0.1 mm, and the longitudinal dimension of the slit 32 is set to 1 mm.

The small diameter portion 21 of the core 2 is inserted from the rear end opening of the mounting hole 33 of the holder 3. The rear end of the holder 3 has the small diameter portion 21 and the large diameter portion 22 of the core 2.
At the same time as being abutted on the stepped portion 23 between the two, the tip of the core 2 is projected forward from the tip of the circumferential covering portion 31.
The protruding length L of the tip of the core 2 from the tip of the circumferential covering portion 31 is set to 0.5 mm. Incidentally, the step portion 23 of the core 2 may have a structure (not shown) in which the step portion 23 provided inside the holder 2 is brought into contact with, in addition to the structure in which the step portion 23 of the core 2 is brought into contact with the rear end of the holder 2. Good.

The rear end portion of the holder 3 and the outer surface of the core 2 are fixed by welding by heating and melting the holder 3 itself or adhesion with an adhesive, and the other outer surface of the core 2 and the holder 3 are fixed. It is not fixed (that is, non-fixed) to the inner surface of the. Further, a slight annular gap is provided between the inner surface of the circumferential covering portion 31 and the outer surface of the core 2.
The inner surface of the circumferential covering portion 31 and the outer surface of the core 2 are not fixed, and an annular gap exists between the inner surface of the circumferential covering portion 31 and the outer surface of the core 2. As a result, when a strong writing pressure is applied, the distal end portion of the core 2 is slightly deformed in the radial direction in the circumferential covering portion 31 (for example, is bent in the radial direction,
By swelling in the radial direction), the tip end portion of the core 2 slightly recedes with respect to the circumferential covering portion 31, so that the tip end portion of the core 2 can be further prevented from being crushed.

FIG. 6 shows a state where the nib 1 of FIG. 1 is worn by use. The nib 1 of the present invention has a core 2 after use.
The front end surface of and the front end surface of the circumferential covering portion 31 simultaneously contact the surface of the paper and are worn. Therefore, as shown in FIG. 5, the tip end surface of the core 2 and the tip end surface of the circumferential covering portion 31 become one continuous convex curved surface due to abrasion, and the tip end portion of the core 2 becomes the circumferential covering portion 31. It is always projected from the tip. Therefore, writing performance similar to that at the start of use can be obtained for a long period of time.

(Second Embodiment of Nib) FIG. 7 shows a second embodiment of the nib 1 of the present invention. This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the slit 3
The number is 2 instead of 6, and the other structure is the same as that of the first embodiment.

(Third Embodiment of Nib) FIGS. 8 and 9 show a third embodiment of the nib 1 of the present invention. This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the slit 32 is formed in the circumferential covering portion 31 and at the same time, the tip of the core 2 is communicated with the slit 32. A longitudinal slit 24 that opens forward and penetrates in the radial direction.
Is formed in a radial cross section. This is done by inserting and fixing the core 2 into the holder 3 and then using a cutter.
It is obtained by simultaneously cutting the tip end portion of and the tip end portion of the circumferential covering portion 31 into a cross shape. Other configurations are first
Same as the embodiment.

(Fourth Embodiment of Nib) FIGS. 10 and 11
A fourth embodiment of the pen tip 1 of the present invention is shown in FIG. This embodiment is a modification of the first embodiment, and is different from the first embodiment in that there are no slits in the flexible circumferential covering portion 31 and the core made of a resin processed body of fibers. The point is that the tip of No. 2 is loosened. By loosening the tip portion of the core 2, the connection between fibers by resin processing is released, and a softer writing feeling can be obtained. The other structure is the same as that of the first embodiment.

(First Embodiment of Writing Tool) FIG. 12 shows a first embodiment of the writing tool 4 of the present invention. The present embodiment is an example in which the pen tip 1 of the first embodiment or the second embodiment is applied to a direct liquid writing instrument. The writing instrument 4 of the present embodiment includes a pen tip 1, an ink retaining member 43 in the shape of a comb tooth to which the pen tip 1 is attached to the tip, and the ink retaining member 43 fitted in the tip opening. It is composed of a shaft cylinder 41 in which an ink tank 42 for directly storing ink is formed inside the storage member 43 at the rear side.

The ink retaining member 43 is of a type in which an ink retaining groove is formed between a plurality of comb teeth, and a central hole 43a is formed through the axial center thereof. A center core 2 protruding rearward from the rear end of the holder 3 of the pen tip 1 is inserted into the center hole 43a, and the rear end portion of the center core 2 is inside the ink tank 42 from the rear end of the ink storage member 43. The ink can be smoothly supplied to the pen tip 1 from the ink tank 42. In the present embodiment, since the core 2 also serves as the ink guiding member inside the central hole 43a of the ink reservoir member 43, the number of parts can be reduced and the ink can be provided at low cost.

In this embodiment, the rear end of the core 2 is made to project from the rear end of the ink retaining member 43 into the ink tank. An ink guide member (not shown) made of a resin extruded product is inserted into the rear portion of the center hole 43a of the ink retaining member 43, and the rear end of the core 2 and the tip end of the ink guide member are central holes. The configuration may be such that the connection is made within 43a.

In FIG. 12, the nib 1 is attached to the tip of the ink retaining member 43 via the two cylinders 44 and 45. A structure in which the pen tip 1 is directly press-fitted into the distal end hole of the axial center of the retention member 43, or the pen tip 1 is inserted into the distal end hole of the shaft cylinder 41.
For example, a configuration of directly press-fitting may be used.

The writing instrument 4 of the present embodiment has a construction in which the nib 1 of the first or second embodiment is applied to a direct liquid type writing instrument. The pen nib 1 of the fourth embodiment may be applied to a direct liquid writing instrument similar to this embodiment.

(Second Embodiment of Writing Tool) FIG. 13 shows a second embodiment of the writing tool 5 of the present invention. This embodiment is an example in which the pen tip 1 of the first embodiment or the second embodiment is applied to a filling material for writing. The writing instrument 5 of this embodiment includes a pen tip 1, a barrel 51 having a tip hole 53 into which the pen tip 1 is press fitted, and an ink occlusion body 52 (for example, a fiber bundle) housed in the barrel 51. Resin processed body or a heat-bonded body of a fiber bundle). The core 2 of the pen tip 1 projects rearward from the rear end of the holder 3, and the rear end of the core 2 has an ink occlusion body 52.
Is pierced and connected to the front end face of. Further, between the outer surface of the holder 3 and the inner surface of the tip end hole 53 of the barrel 51, the barrel 51
An air passage (not shown) that connects the inside and the outside is formed.

The writing implement 5 of the present embodiment has a construction in which the pen tip 1 of the first or second embodiment is applied to a filling type writing implement, but in addition to this, the third or fourth embodiment. The pen nib 1 of the embodiment may be applied to a batting type writing instrument similar to this embodiment.

[0038]

According to the first aspect of the present invention, the pen tip has a soft writing feeling, has sufficient ink drainage so that there is no blur of the handwriting at high speed writing, and there is no difference in the handwriting width depending on the writing direction. Even under a strong writing pressure, it can be satisfied for a long time to prevent the tip portion of the core from being crushed.

In the pen tip according to the second aspect, the circumferential covering portion can satisfy sufficient strength and sufficient flexibility.

In the pen tip according to claim 3, the circumferential covering portion has sufficient flexibility without lowering the strength, and at the same time, there is no difference in flexibility of the circumferential covering portion depending on the direction of the pen tip. Get non-directional nib.

According to the pen tip of claim 4, bending of the tip portion of the core can be prevented.

According to the pen tip of claim 5, since the core is in a free state inside the circumferential covering portion, when strong writing pressure is applied,
The tip end portion of the core is slightly retracted with respect to the circumferential covering portion, and the tip end portion of the core core can be further prevented from being crushed.

The pen tip according to claim 6 provides a soft writing feeling like a writing pen tip.

With the pen tip of claim 7, a softer writing feeling can be obtained.

According to claim 8, soft writing feeling is provided, sufficient ink outflow is provided without blur of handwriting during high-speed writing, there is no difference in handwriting width depending on writing direction, and strong writing pressure is applied. However, it is possible to provide a direct liquid type writing instrument that can satisfy the prevention of the crushing of the tip portion of the core for a long period of time.

According to claim 9, soft writing feeling is provided, sufficient ink outflow is provided without blurring of handwriting during high-speed writing, there is no difference in handwriting width depending on writing direction, and strong writing pressure is applied. However, it is possible to provide a batting type writing instrument that satisfies the requirement of preventing the tip portion of the center core from being crushed for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of a pen tip of the present invention.

FIG. 2 is a vertical cross-sectional view of the core of FIG.

FIG. 3 is a vertical cross-sectional view of the holder shown in FIG.

FIG. 4 is an enlarged view of a main part of the pen tip of FIG. 1 before use.

5 is a cross-sectional view taken along the line AA of FIG.

6 is an enlarged view of a main part of the pen tip of FIG. 1 after use.

FIG. 7 is an enlarged cross-sectional view of essential parts showing a second embodiment of the pen tip of the present invention.

FIG. 8 is an enlarged longitudinal sectional view of a main part showing a third embodiment of the pen tip of the present invention.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is an enlarged longitudinal sectional view of a main part showing a fourth embodiment of the pen tip of the present invention.

11 is a cross-sectional view taken along the line CC of FIG.

FIG. 12 is a longitudinal sectional view showing a first embodiment of the writing instrument of the present invention.

FIG. 13 is a vertical sectional view showing a second embodiment of the writing instrument of the present invention.

[Explanation of symbols]

1 Pen tip 2 Medium core 21 Small diameter part 22 Large diameter part 23 Step part 24 Slit 3 Holder 31 Circular covering part 32 Slit 33 Mounting hole 4 Writing instrument 41 Shaft cylinder 42 Ink tank 43 Ink storage member 43a Center hole 44 Cylindrical body 45 Cylindrical body 5 Writing instrument 51 Shaft cylinder 52 Ink occlusion body 53 Tip hole T Circumferential covering portion wall thickness L The length of protrusion in the longitudinal direction in which the tip end of the core extends from the tip end of the circumferential covering portion

Claims (9)

[Claims] 1. A pen tip comprising a core made of a resin processed body of fibers or a porous body of synthetic resin, and a holder made of an injection molded body of synthetic resin for holding an outer peripheral surface of the core. A pen tip formed by forming a flexible circumferential covering portion on the tip portion of the holder to cover the outer peripheral surface near the tip of the core, and projecting the tip portion of the core forward from the tip of the circumferential covering portion. . 2. The pen tip according to claim 1, wherein the circumferential covering portion has a structure in which the wall thickness of the tip portion of the holder is set in a range of 0.05 mm to 0.3 mm. 3. The circumferential covering portion is provided on a tip portion of the holder,
3 to 1 in the longitudinal direction that opens forward and penetrates in the radial direction
The pen tip according to claim 1 or 2, wherein the two slits are provided at equal intervals. 4. The pen according to claim 1, wherein a protruding length in a longitudinal direction in which a tip end portion of the core is protruded from a tip end of the circumferential covering portion is set to be equal to or less than an inner diameter of a tip opening portion of the circumferential covering portion. Ahead. 5. The pen tip according to claim 1, wherein an inner surface of the circumferential covering portion and an outer surface of the core are not fixed. 6. The pen tip according to claim 1, wherein a tip of a core made of a resin processed body of the fiber is loosened. 7. The pen tip according to claim 1, wherein the tip of the core is cut and processed. 8. A writing instrument comprising an ink retaining member for temporarily retaining overflow ink according to a pressure increase in the ink tank, between the pen point and the ink tank, wherein the pen point comprises: It is composed of a core made of a resin processed body of fibers or a porous body of synthetic resin, and a holder made of an injection molded body of synthetic resin for holding the outer peripheral surface of the core, and the tip of the core is attached to the tip of the holder. A flexible circumferential covering portion is formed to cover the outer peripheral surface, the tip of the core is projected forward from the tip of the circumferential covering portion, and the core is projected rearward from the rear end of the holder. The writing instrument in which the core protruding rearward from the rear end of the holder is inserted into a center hole penetrating the shaft center of the ink reservoir member. 9. A writing instrument in which an ink occlusion body made of a fiber processed body or a porous body is provided behind a pen tip, wherein the pen tip is made of a fiber resin processed body or a synthetic resin porous body. A core and a holder made of a synthetic resin injection-molded body that holds the outer peripheral surface of the core, and a flexible circumferential covering portion that covers the outer peripheral surface near the tip of the core is provided at the tip of the holder. A core formed by projecting the tip of the core forward from the tip of the circumferential coating, projecting the core rearward from the rear end of the holder, and projecting rearward from the rear end of the holder. A writing instrument in which the rear end portion is connected to the front end surface of the ink occlusion body in a piercing manner.