JP2544507Y2 - Capillary writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capillary writing instrument.
More specifically, an ink adjusting member having an ink circulation hole provided in a shaft center portion is disposed between a writing tip portion having a thin tube attached to the tip and an ink tank behind the barrel. The present invention relates to a capillary writing instrument in which an axially movable weight member is inserted into an ink circulation hole, and a needle body is slidable in the capillary.

[0002]

2. Description of the Related Art Conventionally, in a capillary type writing instrument of a type in which a weight member is axially movably inserted into an ink circulation hole, a needle body and a weight member are fixed to each other by bonding, welding, crimping or fitting. Is generally used.

[0003]

In the above-mentioned conventional capillary-type writing instrument, since the weight member generally has an ink guiding action and the ink flows outside or inside thereof, the structure in which the needle member and the weight member are fixed to each other is not fixed. This tends to cause excess solidification due to the protrusion of the adhesive or the like at the location, and also tends to cause air to remain at the securing location, which hinders smooth discharge of the ink to the writing tip. In addition, the needle had to be assembled so as to slightly protrude from the thin tube, and careful work was required to secure the weight member to the needle.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and it is possible to control the length of the needle body extension without requiring a precise and time-consuming fixing work between the needle body and the weight member. Another object of the present invention is to provide a capillary writing instrument which enables smooth ink outflow in terms of performance.

[0005]

[Means for Solving the Problems] The capillary tube writing instrument 1 of the present invention
Is located between the writing tip with the thin tube 3 attached to the tip and the ink tank 21 at the rear of the barrel 2, and has an ink circulation hole 41 in the axis.
Is arranged, and an axially movable weight member 5 is inserted into an ink circulation hole 41 of the ink adjusting member 4 so that the needle body 6 is slidable in the narrow tube 3. In the configured tubular writing instrument, the needle body 6 and the weight member 5 are configured in a non-fixed state, and at least in the writing state, the needle body 6 contacts the weight member 5 and moves forward. It must be assembled so that it can be biased.

[0006] As a method of contact between the needle body 6 and the weight member 5,
Needles abutting portion 61 the rear or the middle portion of 6 is formed, which the abutment 61, formed by bending the needle body 6 rear or intermediate portion in the radial direction (see FIG. 1, FIG. 3), Alternatively, a configuration in which a radial projection is attached to a rear portion or an intermediate portion of the needle body 6 by attaching a separate member or integrally (see FIGS. 4 and 5) is effective. Further, the contact portion 61 is formed to have a size in the radial direction larger than at least the inner diameter of the thin tube 3 to prevent the needle body 6 from coming off the thin tube 3. Further, the needle body 6 and the weight member 5 do not need to be brought into contact except at the time of writing,
Also, needless to say, the weight member 5 may be urged forward by the spring body 7 so as to be always in contact.

[0007] The needle body 6 and the abutting point of the weight member 5, recesses or stepped portion or the like made form <br/> the front end face or the weight member 5 before part of the weight member 5 (FIG. 1, FIG. 3, 4 and 5), as long as it can contact the contact portion 61 of the needle body 6.

In order to smoothly guide the ink from the ink tank 21 to the thin tube 3, the weight member 5 is provided with an axial slit or a ridge 52 on the outer peripheral surface, or an ink guide hole 51 penetrates the axis. If provided, slits or ridges 52 similar to those described above may be provided on the inner peripheral surface.

In a system in which the weight member 5 is urged forward by the spring body 7, a spring seat 53 is formed integrally with the weight member 5, or the spring seat 53 is attached as a separate member. It may be configured. In addition to the method of urging the weight member 5 from behind by the spring body 7, the urging of the needle body 6 forward uses the own weight of the weight member 5 in the writing state without applying the spring body 7. It may be a configuration.

The weight member 5 is formed of a conventionally known metal material such as stainless steel or a synthetic resin such as polyethylene, polypropylene, polyacetal, or nylon. The needle body 6 is appropriately made of a metal wire such as stainless steel or a synthetic resin such as polyacetal.

The ink adjusting member 4 has a function of retaining ink from the ink tank 21 or retreating ink to the ink tank 21 in response to a change in pressure in the ink tank 21. Conventionally known types, such as a type in which a large number of comb teeth are provided on the surface to hold ink and a type in which ink is held in a spiral groove, are used as appropriate.

[0012]

[Function] In the writing state (the writing tip is usually in the downward state),
At least the weight member 5 is urged forward by the spring body 7 or its own weight, so that the weight member 5 can come into contact with the contact portion 61 of the needle body 6, and controls the advance and retreat of the needle body 6.

In the ink flow hole 41, the weight member 5 has an ink guiding action, and ink flows outside or inside the weight member 5. Since the needle body 6 and the weight member 5 are in a non-adhered state, there is no possibility that an obstruction of ink discharge such as a mass of an adhesive is formed. In addition, at the time of writing, even if air remains in the contact portion 61, the fine movement of the needle body 6 in the radial direction causes
The air is moved rearward from the contact portion 61 to enable smooth ink outflow.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIGS. 1 and 2 show an embodiment, in which the needle body 6 is pressed rearward by a sheet of paper.

An ink adjusting member 4 is mounted on a front portion of the barrel 2, and an ink tank 21 is formed on a rear portion of the shaft cylinder 2 to store raw ink. The ink adjusting member 4 has a retaining groove formed by a large number of comb teeth on the peripheral surface, and an ink circulation hole 41 that communicates the ink tank 21 with the thin tube 3 at the writing tip is penetrated at the axis. . Further, the weight member 5 is inserted into the ink circulation hole 41 so as to be movable in the axial direction.
A holding tube 31 holding a thin tube 3 at the tip is fitted to a front portion of the ink adjusting member 4, and a needle 6 is slidably inserted into the thin tube 3.

[0017] The weight member 5 is obtained by extrusion of the polyacetal resin, the axis thereof is formed through the ink guiding hole 51, a plurality of ridges 52 within the ink guiding hole 51 periphery is Tate設Thus, smooth ink distribution from the ink tank 21 to the thin tube 3 is enabled. Further, a cylindrical body is fitted around the outer periphery of the weight member 5 to form a spring seat 53.

The needle 6 is made of a stainless steel wire rod, and its rear end is bent substantially at a right angle in the radial direction.
Is formed, and abuts the front end face of the weight member 5 in the axial direction.

The spring body 7 is held in a compressed state by a spring seat 53 fitted to the weight member 5 and a support protrusion 42 protruding from the inner wall at the rear of the ink flow hole 41 .

In addition to the above, for example, the intermediate portion of the needle body 6 is bent at a right angle in the radial direction to form the contact portion 61, and the contact portion 61 and the weight member 5 are contacted.
A configuration in which the front end surface abuts (see FIG. 3), a separate member is attached to the intermediate portion of the needle body 6 to form a contact portion 61,
Stepped portion formed in the weight member 5 before section abuts composed abutment 61 are possible weight member 5 inside the ink circulation (Fig. 4, see FIG. 6), radially on both sides on the needle body 6 rear end A configuration in which a contact portion 61 protruding from the weight member 5 is formed , and the front contact concave portion of the weight member 5 contacts the corresponding contact portion 61 (see FIG. 5).

[0021]

[Effects of the Invention] Since the needle body and the weight member are not fixed to each other in the thin tube type writing instrument of the present invention, the length of the protruding length of the needle body does not require precise and troublesome fixing work of the needle body and the weight member. It can be controlled, does not hinder the ink circulation due to the adhesive mass at the time of fixing, and furthermore, it is possible to prevent the air from remaining at the contact point between the weight member and the needle by fine movement of the needle during writing. . Therefore, the ink can be smoothly circulated from the ink circulating hole to the thin tube, and a thin tube-type writing instrument can be provided which does not cause blurring or interruption of handwriting even in high-speed writing such as a plotter.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of the capillary writing instrument of the present invention.

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

FIG. 3 is a longitudinal sectional view of a main part showing another embodiment of the contact between the needle body and the weight member.

FIG. 4 is a longitudinal sectional view of a main part showing another embodiment of the contact between the needle body and the weight member.

FIG. 5 is a longitudinal sectional view of a main part showing another embodiment of the contact between the needle body and the weight member.

FIG. 6 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 capillary writing instrument 2 shaft cylinder 21 ink tank 3 capillary 31 holding cylinder 4 ink adjusting member 41 ink circulation hole 42 support protrusion 5 weight member 51 ink guide hole 52 ridge 53 spring seat 6 needle body 61 contact part 7 spring body

Claims (1)

(57) [Scope of request for utility model registration] 1. An ink adjusting member having an ink circulation hole formed in a shaft center portion is disposed between a writing tip having a thin tube attached to a tip thereof and an ink tank behind a barrel. In a capillary type writing instrument in which an axially movable weight member is inserted into an ink circulation hole and a needle body is slidable in the capillary, the needle body 6 and the weight member 5 are not fixed. The capillary writing instrument 1 which is assembled so that the needle body 6 is brought into contact with the weight member 5 so as to be urged forward at least in a writing state.