JP2538324Y2 - 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.
In more detail, an ink adjusting member is interposed between the writing tip and the ink reservoir at the rear of the barrel, and the cleaning needle fixed to the weight moves forward and backward through the narrow tube at the writing tip, and the ink at the writing tip. The present invention relates to a capillary writing instrument of the type that derives

[0002]

2. Description of the Related Art Conventionally, a cleaning needle is loosely inserted into a capillary-type writing instrument to remove dust or ink residue adhering to the tip of a capillary or to guide ink. Adjusted to the length, it is held in a slightly protruding state from the front end of the capillary tube. The protruding length of the cleaning needle is one of the factors that greatly affect the writing performance. (For example, JP-A-61-3799, etc.)

[0003]

In the above-mentioned conventional capillary writing instrument, the adjusting structure is constituted by a screw mechanism.
The projection length of the cleaning needle can be easily adjusted by a rotating operation. However, when the capillary type writing instrument is applied to a plotter, the operating section may be rotated due to a wrong touch at the time of mounting, or at the time of writing. There is a danger that the thread portion is rotated by the vibration or impact of the needle, and the protrusion length of the needle is fluctuated. The present invention solves the above-described problems, does not easily change the projection length of the cleaning needle, and furthermore, in terms of writing performance, also has no hand jumps and blurring even at the time of high-speed writing such as a plotter. It is an object of the present invention to provide a capillary writing instrument that enables smooth ink outflow.

[0004]

Means for Solving the Problems A thin tube type writing instrument of the present invention 1
The ink adjusting member 4 having a central hole 41 penetrated in the axial center is disposed between the writing tip 2 having a thin tube 21 attached to the tip and the ink reservoir 10 behind the barrel 3. The cleaning needle 8 fixed to the weight member 7 is loosely inserted into the thin tube 21 to draw out the ink in the ink reservoir 10 at the rear of the barrel 3 to the writing tip, and the thin tube 21 at the tip of the cleaning needle 8 is drawn. A tubular writing instrument configured such that a protruding length from a front end is adjustable, wherein an inner cylindrical body 5 is provided in the center hole 41, and an outer periphery of the inner cylindrical body 5 and an inner wall of the center hole 41 are rubbed at at least one place. The inner cylinder 5 is housed so as to be movable forward by a pressing operation of the inner cylinder 5 from behind, and the weight member 7 is attached to the inner cylinder 5 by a spring 55. A contact portion 52 is inserted in a state of being urged forward and protrudes from the inner periphery of the inner cylinder 5. The ink guide pipe 6 having a plurality of ink guide grooves 61 on the outer circumference or inner circumference in the axial direction is disposed between the thin tube 21 and the inner cylinder 5. The cleaning needle 8 must be loosely inserted into the ink guide pipe 6.

[0005] The frictional engagement between the outer periphery of the inner cylinder 5 and the inner wall of the center hole 41 in the above is performed by a combination of a rib, a ridge and a projection, a combination of a rib, a ridge, a projection and a smooth surface, and a smooth surface and a smooth surface. A combination of surfaces and the like are appropriately adopted. For example, an annular projection 51 protruding from the outer periphery of the inner cylindrical body 5 and a vertical ridge 4 protruding from the inner wall of the center hole 41.
1a is engaged (see FIGS. 1, 2 and 3), and a projection 51 provided on the outer periphery of the inner cylinder 5 at appropriate intervals in the circumferential direction is engaged with a smooth surface of the inner wall of the center hole 41 (see FIG. 1). 6 and 7
(See FIGS. 8 and 9), and a projection 41b provided on the inner wall of the center hole 41 at an appropriate interval in the circumferential direction and a smooth surface of the outer periphery of the inner cylinder 5 are engaged. Ridge 51
1 and a type in which a protruding annular projection 41b is engaged with the inner wall of the center hole 41 (see FIGS. 10 and 11). The degree of the frictional engagement between the outer periphery of the inner cylindrical body 5 and the inner wall of the center hole 41 can be moved forward by an appropriate pressing force at the time of adjusting the needle projection length, and the weight member 7 can be moved at the time of writing.
Are not easily moved due to collision with the contact portion 52 or vibration of the writing implement as a whole. It is not necessary that the number of engagement portions is one, and a plurality of engagement portions may be provided. Further, the position of the engagement portion may be any position as long as it is the outer periphery of the inner cylinder 5, and may be provided at any of the front part, the center part, and the rear part. Further, the engagement portion is formed by the outer periphery of the inner cylinder 5 and the center hole 4 as described above.
An ink flow space in the axial direction may be provided between the inner walls, or may be closely attached without consideration.

The abutting portion 52 protruding from the inside of the inner cylindrical body 5 is provided with a rib or the like through which ink can flow in a stepped or tapered shape.

The weight member 7 is made of a metal such as stainless steel,
Synthetic resins such as polyethylene, polypropylene, polyacetal, and nylon are effective as materials, and are appropriately adopted in consideration of weight and the like. Further, the cleaning needle 8 is not limited to a metal wire, but may be a synthetic resin material such as polyacetal. The weight member 7 and the cleaning needle 8 are configured such that when the weight member 7 is made of metal, the caulking is fixed and adhered to the tip of the cleaning needle 8. When the weight member 7 is made of synthetic resin, the cleaning needle 8 is used. A configuration in which the fixed metal parts are press-fitted is effective.

As the ink adjusting member 4, a conventionally known member such as a member provided with a large number of ink grooves such as comb grooves and spiral grooves is employed. The ink guide pipe 6 may be provided with an ink guide groove 61 on the outer periphery or the inner periphery, and the guide groove 61 may be obtained by vertically providing a rib, a groove, a slit, a notch or the like in an axial direction on a peripheral surface. Can be

[0009]

The inner cylinder body 5 is frictionally engaged with the outer periphery by the inner wall of the center hole 41 of the ink adjusting member 4, and can be moved forward by an appropriate pressing operation from the rear during assembly and manufacture and when the tip of the needle is worn. Abutting portions 52 arranged on the inside
Can be moved forward to adjust the protruding length of the cleaning needle 8. Also, the inner cylinder 5 does not move with a relatively small external force such as shock or vibration during writing, does not easily change the protruding length of the cleaning needle 8, and has a desired needle adjustment length. Hold.

The ink guide pipe 6 smoothes the ink flowing from the outer periphery or the inside of the inner cylinder 5 to the front thin tube 21.
And smooth ink ejection at the time of mounting an ink cartridge, improving ink followability even in high-speed writing, and preventing handwriting skipping and blurring.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. (See FIGS. 1 to 5) The barrel 3 has an ink reservoir 10 formed at the rear, an ink adjusting member 4 mounted at the front, and a thin tube 21 at the tip at the front of the ink adjusting member 4. The holder 9 is fitted. In addition, ink adjusting member 4 center hole 4
1, the inner cylindrical body 5 is inserted and frictionally engaged with the inner wall of the center hole 41. A cleaning needle 8 is provided in the inner cylinder 5.
The weight member 7 to which is fixed is urged forward by the spring body 55, and is accommodated so as to be able to resiliently move in the axial direction.

The ink adjusting member 4 has an ink retaining groove formed by a large number of comb teeth on the outer periphery. Further, the comb teeth have slit-shaped ink grooves 42 at positions symmetrical with respect to the center line in the axial direction, and air replacement. A concave groove 43 is provided to cope with a change in the internal pressure of the ink reservoir 10. Also, the ink adjusting member 4
Is provided with a center hole 41, and a holder is provided at the front.
A fitting hole 45 is formed so as to communicate with the center hole 41, and a rear portion is provided with a protruding portion 44 for penetrating the cartridge plug. An ink introduction hole 44a is provided at an opposite position on the side of the protruding portion 44, and communicates between the ink reservoir 10 and the center hole 41 so that ink can flow. In the center hole 41,
Four ridges 41a are provided on the inner wall extending substantially from the rear end of the protrusion 44 to the fitting hole 45 in the axial direction so as to be frictionally engaged with the inner cylinder 5 or the inner cylinder. It functions as a guide projection for ink flowing between the outer periphery of the body 5 and the inner wall of the center hole 41.

The inner cylinder 5 is provided with a fitting hole 54 for the ink guide pipe 6 and a reduced diameter portion 53 at a front portion thereof.
A peripheral step is formed as a contact part 52 at the rear of the head.
A spring seat 56 is fitted on the inner periphery of the rear portion of the inner cylindrical body 5, and an annular projection 51 is projected from the rear end portion. The annular projection 51 has a tapered surface formed at the front, and an edge provided at the rear end. The annular projection 51 is engaged with the ridge 41a of the inner wall of the center hole 41, and is at least pressed by a certain amount of pressing force. It is configured to be movable forward and cannot be moved forward or backward by other external force such as impact or vibration.
(See FIG. 3) The ink adjusting member 4 is obtained by injection molding of plastic, and the inner cylinder 5 is obtained by cutting metal (such as brass) and nickel plating.

The spring seat 56 is formed in a ring shape from synthetic rubber, is fitted into a circumferential concave portion of the inner cylinder 5 and is fixed to the inner cylinder 5, so that the cleaning needle 8 has a projection length of the cleaning needle 8. At the time of adjustment, even if the inner cylinder 5 is pressed from the rear to move the contact portion 52, the compression length of the spring 55 is not changed, and a constant pressing force of the spring 55 is always maintained. The weight member 7 is made of stainless steel, and the front part is reduced in diameter to clear the front part.
A lining needle 8 is fixed by caulking, and a shoulder 71 abutting on the abutting portion 52 inside the inner cylinder 5 is provided circumferentially behind the knurling needle 8. When the weight member 7 is assembled into the inner cylinder 5, the shoulder 71 is urged forward by a spring 55 (coil spring).

The ink guide pipe 6 is an extruded product made of a polypropylene resin (the surface of which has been subjected to an activator treatment in order to improve ink wettability), has a hole formed in the center, and a plurality of ribs 62 formed on the outer periphery. The rib 6 is installed vertically in the axial direction.
An ink guide groove 61 is formed between the two (see FIGS. 1 and 5). When assembling, the ink guide pipe 6
Is inserted into the inner hole of the holder 9 and is brought into contact with the tapered bottom surface of the inner hole of the holder 9. Further, the rear portion of the ink guide pipe 6 is press-fitted into the fitting hole 54 at the front portion of the inner cylinder 5 when the inner cylinder 5 is inserted into the center hole 41. Further, the pressure input between the ink guide pipe 6 and the inner cylinder 5 is set to be smaller than the engagement force between the inner cylinder 5 and the inner wall of the ink adjusting member 4. A small gap (play) is provided between the inner cylindrical body reduced diameter portions 53 even at the end of the assembling, so that the needle projection length can be adjusted even after the cleaning needle 8 is worn.

As means for pressing the inner cylindrical body 5 forward, for example, a pressing element having a convex portion insertable into the center hole 41 is used.
A configuration in which the inner cylinder body 5 is pressed against the rear end thereof is effective.

[0017]

[Effects of the Invention] The present invention has the above-described structure, and has a clear structure.
The projection length of the needle is not changed accidentally due to vibration during writing, impact of the weight member, or accidental touch, and it is simpler than the conventional screw adjustment method during initial assembly and manufacture. Thus, it is possible to easily adjust the cleaning needle protrusion length. In addition, by disposing an ink guide pipe between the inner cylinder and the thin tube, the ink in the center hole of the ink adjusting member is quickly guided to the thin tube, and the initial ink discharge when the cartridge is mounted is smooth. In a short time, and high-speed writing performance when applied to a plotter or the like can be improved.

[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 an enlarged view of a portion H in FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view taken along line CC of FIG. 1;

FIG. 6 is a longitudinal sectional view of a main part showing a second embodiment of the friction engagement.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a longitudinal sectional view of a main part showing a third embodiment of the friction engagement.

FIG. 9 is a sectional view taken along line EE of FIG. 8;

FIG. 10 is a longitudinal sectional view showing a main part of a fourth embodiment of the friction engagement.

FIG. 11 is a sectional view taken along line FF of FIG. 10;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 capillary writing instrument 2 writing tip 21 capillary 3 barrel 4 ink adjusting member 41 center hole 41a ridge 41b projection 42 slit-shaped ink groove 43 air replacement groove 44 protrusion 44a ink introduction hole 45 fitting hole 5 inner cylinder Reference Signs List 51 projection 511 ridge 52 contact portion 53 reduced diameter portion 54 insertion hole 55 spring body 56 spring seat 6 ink guide pipe 61 ink guide groove 62 rib 7 weight member 71 shoulder 8 cleaning needle 9 holder 10 ink reservoir

Claims (2)

(57) [Scope of request for utility model registration] 1. An ink adjusting member 4 having a central hole 41 penetrated in an axial center portion is disposed between a writing tip portion 2 having a thin tube 21 attached to a tip end thereof and an ink storing portion 10 behind a barrel 3. ,
A cleaning needle 8 having a rear portion fixed to the weight member 7 is loosely inserted into the thin tube 21 so that the ink storing portion 1 at the rear portion of the barrel 3 is provided.
0 is drawn out to the writing tip, and the length of projection of the tip of the cleaning needle 8 from the front end of the capillary 21 is adjustable so that it is adjustable. 5, the outer periphery of the inner cylinder 5 and the inner wall of the center hole 41 are frictionally engaged at at least one place, and the inner cylinder 5 is accommodated so as to be movable forward by a pressing operation of the inner cylinder 5 from behind. The weight member 7 is inserted into the inner cylinder 5 in a state where the weight member 7 is urged forward by a spring body 55, and a contact portion 52 protruding from the inner periphery of the inner cylinder 5 is formed. A capillary writing instrument 1 to be abutted. 2. An ink guide pipe 6 having a plurality of ink guide grooves 61 on an outer periphery or an inner periphery in an axial direction is provided in the thin tube 21.
2. The narrow tube-type writing instrument 1 according to claim 1, wherein the cleaning needle 8 is disposed between the ink guiding pipe 6 and the cleaning needle 8.