JP3220736B2 - Writing implement and assembling method of writing implement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing implement such as a marking pen, a felt-tip pen, a ball-point pen, and a method for assembling a writing implement. More specifically, an ink guide core made of a synthetic resin is held by an ink guide core holding portion at the tip of the barrel, and an ink occluding body is disposed in the barrel, and the ink guide wick is provided at the tip of the ink absorber. The present invention relates to a writing implement having an end immersed and a method of assembling the writing implement.

[0002]

2. Description of the Related Art Conventionally, in a writing instrument of this kind, for example,
Japanese Utility Model Laid-Open No. 60-175682 discloses that an ink guide wick (pen body) projecting rearward from an ink guide wick holding portion (holder) is immersed and connected to the tip of an ink occluding body provided in a shaft cylinder. Is disclosed. Also, Shokai 6
JP-A-2-35882 discloses a configuration in which an ink guide core (relay core) is inserted into a protective pipe, and a rear end thereof is connected to an ink storage body (ink holding body).

However, Japanese Utility Model Application Laid-Open No. SHO 60-175682 describes the above.
As shown in FIG. 6, when the ink guide is immersed in the front end of the ink occluding body, the rear end of the ink guide core exceeds the elastic limit due to its large pushing force, and has a "-" shape in the radial direction. May break. As a result, the connection between the ink guide core and the ink occluding body becomes insufficient, and ink ejection failure from the pen tip often occurs.

Further, as shown in FIG. 7, when the rear end of an ink guide core is immersed in the front end of an ink occluding body, the ink of the type disclosed in Japanese Utility Model Laid-Open Publication No. Since the stress is concentrated on the guide core, the ink guide core may be bent in an L-shape with the back end of the protective pipe as a fulcrum due to variations in the angle of immersion of the ink guide core. As a result, not only is the connection with the ink occluding body incomplete, but also
The ink conduction path of the ink guide core is crushed and blocked at the bent portion, resulting in a defective product that cannot be written.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. When the ink guide core is immersed and connected to the ink occluding body, the ink guide core and the ink are broken by the breakage of the ink guide core. An object of the present invention is to provide a writing implement and a method for assembling the writing implement, which avoid a poor connection with the occlusion body and have no risk of causing a poor ink ejection from a pen tip.

[0006]

According to the present invention, an ink guide core made of synthetic resin is provided at an ink guide core holding portion at the tip of a barrel.
A writing tool in which the ink guide 3 is disposed in the barrel 1 and the rear end of the ink guide 2 is immersed and connected to the tip of the ink absorber 3.
A curved portion 4 is provided on the ink guide core 2 between the rear end and the ink guide core holding portion 6 to suppress radial deformation of the curved portion 4.
A supporting portion 5 for controlling the movement is disposed in the barrel 1, and the supporting portion 5 is
The ink guide core 2 surrounding the curved portion 4 of the ink guide core 2
An inner peripheral wall having an inner diameter larger than the outer diameter,
The inner diameter is 1.5 to 5.0 times the outer diameter of the ink guide core 2.
And requirements that that.

[0007]

[0008]

In the present invention, the shaft cylinder 1 is held at the tip.
The ink guide core 2 made of a rod-shaped synthetic resin is housed in the barrel 1.
Writing instrument to connect the ink storage body 3 to be connected
After holding the ink guide core 2 at the tip of the shaft cylinder 1, the shaft
Take the ink occluding body 3 housed in the cylinder 1 at the rear end of the barrel 1
Press forward by inserting the tail plug 8 to attach, and guide the ink.
The core 2 is immersed and connected to the ink occluding body 3,
During the connection process, hold the tip of the ink storage body 3 and the ink guide core
At the same time as the ink guide core 2 is curved and deformed between the
A writing instrument that supports the bending deformation in a radially inward direction
Require assembly method.

[0010]

The curved portion 4 is provided in the ink guide core 2 between the rear end of the ink guide core 2 and the ink guide core holding section 6, so that the rear end of the ink guide core 2 is immersed in the front end of the ink storage body 3. In the connection process, the pushing force is dispersed or absorbed or reduced in the entire curved portion 4 of the ink guide core 2, so that the ink guide core 2 can pierce the ink storage body 3 softly. As a result, the ink guide core 2 exceeds the elastic limit and is hard to break at a specific location. As a result, insufficient connection between the ink guide core 2 and the ink occluding body 3 and blockage of the ink conduction path at the break location are prevented. It can be avoided, and there is no possibility of causing ink ejection failure from the pen tip.

Further, by disposing a support portion 5 for suppressing radial deformation of the curved portion 4 in the shaft cylinder 1, in the process of immersing and connecting the rear end of the ink guide core 2 to the front end of the ink storage body 3, In the case of further immersion after the initial soft piercing, the curved portion 4 is suppressed and supported by the support portion 5, so that the curved portion 4 does not break beyond the elastic limit, and the ink guide core 2 is securely inked. The occluding body 3 can be immersed and connected.

Since the supporting portion 5 is an inner peripheral wall surrounding the curved portion 4 of the ink guide core 2 and having an inner diameter larger than the outer diameter of the ink guide core 2, the bending of the ink guide core 2 in the radial direction is curved. This can be prevented all around the part 4.

Further, since the inner diameter of the inner peripheral wall is 1.5 to 5.0 times the outer diameter of the ink guide core 2, the curved portion 4 of the synthetic resin ink guide core 2 limits the elastic limit. There is no breakage beyond that (in the case where the inner diameter of the inner peripheral wall portion is 5.0 times or more the outer diameter of the ink guide core 2), and the support portion 5
That the ink guide core 2 protruding from the rear end is broken by the end surface of the ink storage body 3 ( the inner diameter of the inner peripheral wall portion is
Problem when the outer diameter is 1.5 times or less of the above).

[0014]

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

A first embodiment is shown in FIGS. 1, 2 and 3. The barrel 1 accommodates the ink occluding body 3 therein, has a metal holder 7 to which the ink guiding core 2 is fixed at the front end, and a tail plug 8 that supports the rear end of the ink occluding body 3 at the rear end. Is fitted. The tip end of the ink storage body 3 is supported by a stopper rib 11 provided on the inner wall of the barrel 1. As shown in FIG. 2, the stopper rib 11 is formed of a cylindrical wall 11a divided into three parts, and a reinforcing wall 11b connecting the inner wall of the shaft cylinder 1 and the cylindrical wall 11a.

The front portion of the ink guide core 2 is inserted into the holder small diameter portion 71 and loosely inserted into the holder large diameter portion 72. A synthetic resin cylinder 51 is inserted into the holder large-diameter portion 72, and the ink guide core 2, the cylinder 51, and the holder large-diameter portion 72 are fixed to each other by an adhesive 9. The rear portion of the ink guide core 2 protrudes from the rear of the holder large-diameter portion 72 to form an arcuate curved portion 4, and the outer periphery thereof is surrounded by the cylindrical body 51. Thereby, upon immersion connection to the ink occlusion body 3 of the ink guiding core 2, the bending deformation of the inner circumferential wall in the thus radially of the cylindrical body 51 is suppressed supported. The curved portion 4 of the ink guide core 2 is preferably formed by the pushing force in the process of immersion connection between the rod-shaped ink guide core 2 and the ink occluding body 3, but before the immersion connection to the ink occluding body 3. May be formed in advance on the ink guide core 2. The bending portion 4 may be provided in a plurality of places, in addition to one, and the shape may be a wave shape, a spiral shape, or the like in addition to the bow shape.

The cylindrical body 51 has a length of at least half the projecting length of the ink guide core 2 rearward from the rear end of the large-diameter portion 72 of the holder.
Preferably, the outer circumference of the ink guide core 2 is 2/3 or more. Accordingly, at least the vertex of the curved portion 4 can be reliably supported. Further, the inner diameter of the cylindrical body 51 is set to about three times the outer diameter of the ink guide core 2. This is because the inner diameter of the cylinder 51 is equal to the outer diameter of the ink guide core 2.
If it is more than 0 times, the curved portion 4 of the synthetic resin ink guide core 2 breaks beyond its elastic limit in the process of immersing and connecting the ink guide core 2 to the ink occluding body 3 (defect shown in FIG. 6). If the inner diameter of the tubular body 51 is 1.5 times or less the outer diameter of the ink guide core 2, the effect of the bending is weakened when the ink guide core 2 is immersed and connected, and it protrudes from the rear end of the support portion 5. This is because the ink guide core 2 that has been bent may be bent by the end face of the ink occluding body 3 (the defect shown in FIG. 7), or the insertion of the ink guide core 2 into the cylinder 51 may not be smooth.

The ink guide core 2 is made of a synthetic resin (for example, polyacetal, polyester, polyamide, or the like) rod-shaped extruded body having an ink passage therein, or a rod-shaped processed body of synthetic resin fiber having a capillary gap. And the like, but an extruded product is preferable in that it is easy to obtain a curved deformation. The outer diameter of the ink guide core 2 is 0.8 mm or less, preferably 0.1 mm or less, so as to facilitate bending deformation.
Those having a small diameter of 5 mm or less are effective. In this embodiment,
The leading end of the ink guide core 2 has a holder small diameter portion 71.
It is slightly protruded to the outside to function as a pen tip, and its rear end is tapered to facilitate piercing into the ink occluding body 3. In addition, the tip of the ink guide core 2 may be connected to another pen tip such as a ballpoint pen tip or a fiber pen tip projecting from the tip of the barrel 1, or the rear end of the ink guide core 2 may be sharpened by oblique cutting. Is also possible.

In addition to the structure in which the ink guide core 2 is held at the tip of the barrel 1 via the holder 7, the structure in which the ink guide core 2 is directly held at the tip of the barrel 1 is also effective. As a structure for holding the ink guide core 2 (ink guide core holding portion 6), appropriate means such as caulking, adhesion, press-fitting, fitting, and engagement are adopted.

The ink occluding body 3 includes, for example, a fiber bundle, a fiber processed body, a porous body, and a felt.

The inner peripheral wall may be integrally connected to the barrel 1 or the holder 7, or another member having an inner hole (such as the barrel 51) may be fixed to the barrel 1 or the holder 7.
Alternatively, a configuration in which it is arranged in the shaft cylinder 1 in a non-fixed state may be used.

Here, the assembling method of the above embodiment will be described (see FIG. 4). First, the ink guide core 2 and the cylinder 5
The holder 7 bonded and fixed to 1 is attached to the tip of the barrel 1 by press fitting. Then, from the rear end opening of the barrel 1
The ink occlusion body 3 which has been impregnated with ink in advance is inserted, and then the tail plug 8 is fitted into the opening of the rear end of the barrel 1 while making contact with the rear end of the ink occlusion body 3. During the fitting process of the tail plug 8, the ink occluding body 3 is pressed forward, and the ink guiding core 2 and the ink occluding body 3 are immersed and connected. Thereby, the work of attaching the tail plug 8 and the work of connecting the ink guide core 2 and the ink occluding body 3 are performed at the same time, and the assembling process can be simplified. Further, during the fitting process of the tail plug 8, the rod-shaped ink guide core is deformed for the first time (the curved portion 4 is formed),
Its curved portion 4 is supported in the thus radially inner circumferential wall of the cylindrical body 51.

FIG. 5 shows a second embodiment of the present invention. Shaft barrel 1
A metal holder 7 having a ball 73 rotatably held at the tip is attached to the tip. The holder 7
At the rear, the tip of the ink guide core 2 is press-fitted and held.
The ink guiding core 2 is loosely inserted in the peripheral wall portion in which is formed integrally with the shaft tube 1 tip. When the rear end of the ink guide core 2 is immersed and connected to the front end of the ink occluding body 3, a wavy curved portion 4 is formed at an intermediate portion thereof. The operation and effect are the same as those of the first embodiment.

[0025]

According to the present invention, the ink guide core has a curved portion between the rear end of the ink guide core and the ink guide core holding portion, or the ink guide core is immersed and connected to the ink occluding body. In the process, the ink guiding core is curved and deformed between the ink absorbing body tip and the ink guiding core holding portion), and in the process of immersing and connecting the ink guiding core rear end to the ink absorbing body tip, the pushing force is dispersed absorbed or alleviated by the entire curved portion of the ink guiding core, it is possible to soft thrusts into the ink occlusion body in ink guiding core. This makes it difficult for the ink guide core to break at a specific location beyond the elastic limit.As a result, it is possible to avoid an insufficient connection between the ink guide core and the ink occluding body and blockage of the ink conduction path at the break location. There is no danger of causing poor ink output from the pen tip. Further, by providing a support portion for suppressing radial deformation of the curved portion in the shaft cylinder, or for suppressing and supporting the curved deformation radially inward, the rear end of the ink guide core can be an ink occluding body. In the process of immersive connection to the tip,
In the case of further immersion after the initial soft piercing, the curved portion does not break beyond the elastic limit, and the ink guide core can be reliably immersed and connected to the ink occluding body. Further, since the support portion is an inner peripheral wall portion surrounding the curved portion of the ink guide core and having an inner diameter larger than the outer diameter of the ink guide core, radial bending of the ink guide core is prevented around the curved portion. it can. Further, since the inner diameter of the inner peripheral wall portion is 1.5 to 5.0 times the outer diameter of the ink guide core, the curved portion of the synthetic resin ink guide core does not break beyond the elastic limit. Further, the ink guide core protruding from the rear end of the support portion is not broken by the end face of the ink occluding body.

[Brief description of the drawings]

FIG. 1 is an enlarged longitudinal sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view showing the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing an assembling process of the first embodiment of the present invention.

FIG. 5 is an enlarged longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 6 is an enlarged vertical sectional view of a main part showing a conventional example.

FIG. 7 is an enlarged longitudinal sectional view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 11 Stopper rib 11a Cylindrical wall part 11b Reinforcement wall part 12 Air hole 2 Ink guide core 3 Ink occluding body 4 Curved part 5 Support part (inner peripheral wall part) 51 Cylindrical body 6 Ink guide core holding part 7 Holder 71 Holder Small diameter part 72 Holder large diameter part 73 Ball 8 Tail plug 9 Adhesive

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B43K ⁷ /00-8/24 B43K 15/00-15/02

Claims (2)

(57) [Claims] An ink guide core (2) made of synthetic resin is held in an ink guide core holding section (6) at the tip of a barrel (1), and an ink occluding body (3) is placed in the barrel (1). Arrange,
At the tip of the ink storage body (3), the ink guide core (2)
In writing implement and the rear end immerses connection, the curved portion (4) provided in the ink guiding core (2) between the ink guiding core (2) rear and the ink guiding core holding section (6), said curved Department
The supporting part (5) for suppressing the radial deformation of (4)
(1) The support portion (5) is disposed in the ink guide core.
An ink guide core (2) surrounding the curved portion (4) of (2)
An inner peripheral wall having an inner diameter larger than the outer diameter,
The inner diameter is 1.5 to 5.0 times the outer diameter of the ink guide core (2).
Writing instrument, characterized in that it. 2. A bar-shaped synthetic tree held at the tip of a barrel (1).
The ink guide core (2) made of fat is contained in the barrel (1).
With a method of assembling a writing instrument that connects the ink occluding body (3)
Then, hold the ink guide core (2) at the tip of the barrel (1)
After that, the ink occluding body (3) housed in the barrel (1) is
By inserting the tail plug (8) attached to the rear end of the barrel (1)
Press forward to insert the ink guide core (2)
(3) Immersive connection, in the process of the immersive connection,
The tip of the ink occluding body (3) and the ink guide wick holding section (6)
At the same time, the ink guide core (2) is curved and deformed.
Of writing implements that suppress and support bending deformation
Standing method.