JP2511659Y2 - Capillary writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a capillary writing instrument. More specifically, the present invention relates to a capillary writing instrument of a type in which an ink adjusting member is inserted into a front portion of a shaft cylinder to open an ink storage portion and draw out ink to a writing tip.

[Conventional technology]

BACKGROUND ART Heretofore, some proposals have been disclosed regarding a capillary writing instrument of the above type. For example, as a means to constantly and smoothly supply ink from the ink reservoir to the tip of writing to improve ink followability during high-speed writing, Shokai 61-152484
The gazette and Jitsukaihei No. 2-40583 are listed.

[Problems to be solved by the invention]

The thin tube type writing instrument disclosed in Japanese Utility Model Laid-Open No. 61-152484 is a proposal to cut a capillary groove on both or one of the opposing side surfaces of the pen tip holder and the weight, but the proposal improves the ink outflow property. Even if it is done, it does not function effectively because the gap formed between the weight and the inner wall of the pen tip holder is not sufficient,
At the initial stage of assembly (inserting the ink adjustment member into the shaft cylinder and connecting it to the ink reservoir), it is difficult to change the ink and air smoothly within the gap, and if shaking operation is not performed many times, The ink could not be led out to the tip of the writing. Further, even when writing is possible, bubbles tend to remain in the gap, which hinders smooth ink outflow.

Further, Japanese Utility Model Application Laid-Open No. 2-40583 discloses a configuration in which a wide portion and a narrow portion are relatively unevenly provided in an ink passage. There is a risk that ink may enter into the ink flow rate adjustment groove of the adjustment member, which has a strong capillary force, before the ink passage and reduce the adjustment function of the ink adjustment member, or may prevent the ink from being quickly drawn to the writing tip. there were.

The present invention solves the above-mentioned problems, and at the time of writing, the ink flow resistance is reduced to supply ample ink to the tip of the writing to meet high-speed writing, and at the same time, in the ink passage (center hole) of the ink adjusting member. The air and ink can be changed quickly and reliably, and the ink can be quickly written without flowing the ink into the ink flow rate adjusting groove of the ink adjusting member to reduce the ink adjusting function even at the initial stage of assembly. The present invention is intended to provide a thin-tube writing instrument that is led out to the tip.

[Means for solving problems]

The thin tube type writing instrument 1 of the present invention has a thin tube 61 attached to the tip,
An ink flow rate adjusting groove (21) and a slit-shaped ink groove (23) extending longitudinally through the groove (21) are provided on the peripheral surface, a central hole (22) is formed in the axial center portion, and a cleaning needle (31) is provided in the central hole (22) at the front. The moving member 3 is inserted and the cleaning needle is inserted into the thin tube 61.
Ink adjusting member 2 with 31 inserted, and ink reservoir
A shaft cylinder 7 having 71 inside thereof, and by inserting the ink adjusting member 2 into the front part of the shaft cylinder 7, the ink reservoir 71 is opened, and the ink reservoir 71 and the ink reservoir 71 A thin tube type writing instrument of a type for connecting with the central hole 22, wherein the cylindrical body 5 is loosely inserted into the central hole 22 with the front end thereof being locked by the locking portion 63, and the sliding member 3 outer surface and the cylindrical body 5 inner surface are connected. An inner annular gap 41 and an outer annular gap 42 are formed so as to communicate with each other at the engaging portion 63, and between the outer surface of the tubular body 5 and the inner surface of the center hole 22. The minimum gap dimensions of the annular gap 41 and the outer annular gap 42 are different from each other and each is larger than the minimum groove width of the ink flow rate adjusting groove 21.

The size relationship of the minimum gap size (capillary force) between the annular gaps 41 and 42 is not specified. That is, the minimum gap size of any of the annular gaps 41 and 42 may be set to be large (that is, the capillary force is small).

In addition, the capillary force of the inner annular gap 41 is transferred to the outer annular gap.
In the system in which the force is set to be larger than the capillary force of 42, on the outer surface of the sliding member 3 and the inner surface of the tubular body 5, minute ribs, protrusions, or slits are vertically provided on either or both members,
On the contrary, in the system in which the capillary force of the outer annular gap 42 is set to be larger than the capillary force of the inner annular gap 41, the cylindrical body 5
A structure in which minute ribs, protrusions, or slits are provided on the outer surface and the inner surface of the center hole 22 is also effective.

In the above description, the ink adjusting member 2 may be one in which the ink flow rate adjusting groove 21 is provided on the peripheral surface, and specific examples thereof include a comb groove and a spiral groove.

Examples of the material of the sliding member 3 include metals such as stainless steel and synthetic resins such as polyethylene, polypropylene, polyacetal, and nylon. When the protrusions or slits are provided in the axial direction of the outer surface, at least the outer circumference is the synthetic resin described above. The cleaning needle is formed on the tip axial center.
It is effective to insert a metal part to which 31 is fixed.

As the material of the cleaning needle 31, conventionally used general-purpose materials such as metal members such as amorphous metal, stainless steel, superelastic alloy, and high strength fibers such as carbon fiber, aramid fiber and polyethylene fiber are effective.

The tubular body 5 divides the annular gap 4 between the inner surface of the central hole 22 and the outer surface of the sliding member 3 into the inner and outer portions to form an inner annular gap 41 and an outer annular gap 42. Injection molded bodies and metal pipes are applied.

[Action]

At the time of assembly, when the ink adjusting member 2 is inserted into the front portion of the shaft cylinder 7 and communicates with the ink storing portion 71, the ink in the ink storing portion 71 flows into the ink flow rate adjusting groove 21 before the ink flows into the ink storing portion 71. The air that has flown into either of the annular gaps 41 or 42 having a stronger capillary force than the groove 21 promptly flows into the center hole 22 from the initial stage, and the air existing from either of the gaps 41 or 42 toward the ink reservoir 71 direction. At the same time, the ink is discharged from the writing tip 6 through the thin tube 61 to the outside, and the air and the ink in the center hole 22 are swiftly and smoothly replaced. Therefore, the ink adjusting member 2
It is possible to promptly guide the ink to the writing tip portion 6 without decreasing the ink adjusting function of (1) and to make the writing ready state.

Also, at the time of high speed writing, the above-mentioned separated annular gap 41
By virtue of the strong capillary force of each of the nozzles 42 and 42 and the gaps 41 and 42 both functioning as ink passages, quick and ample ink supply is possible, and line breaks and blurring do not occur.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. (See FIG. 1 to FIG. 6) The ink adjusting member 2 is obtained by plastic injection molding, and is provided with an annular comb groove 21 having a large number of comb teeth and a slit-shaped ink groove 23 on the peripheral surface, and a holder at the front axis. The fitting hole, the restriction portion 25 at the rear, and the central hole 22 communicating with the fitting hole at the shaft center.
Is provided. The regulating portion 25 projects cylindrically in the rear ink storage portion 71, and has a guide rod of the sliding member 3 in the center.
A guide hole 253 through which the 33 is inserted and a notch 252 are formed on the side surface, whereby the center hole 22 and the ink reservoir 71 are communicated with each other. Further, two stoppers 251 for supporting the cylindrical body 5 are provided inside the restricting portion 25 so as to project.

The annular comb grooves 21 have different groove widths sequentially from the front end direction in units of groups, that is, 0.5 mm (1 piece), 0.45 mm (1 piece), 0.4 mm
mm (2 pcs), 0.35 mm (2 pcs), 0.3 mm (3 pcs), 0.25 mm
(4 pieces), 0.2 mm (3 pieces: minimum groove width) are arranged in the groove width, and the slit-shaped ink groove 23 that vertically penetrates the comb groove 21 is the groove width.
It is set to 0.18 mm. An air exchange groove 24 having a width of 1.5 mm is provided at a position facing the slit-shaped ink groove 23.

The sliding member 3 includes a central portion 32 having a plurality of protrusions 321 in the axial direction, a cleaning needle 31 protruding in front of the central portion 32, and a guide rod 33 protruding rearward of the central portion 32. Composed of and. The guide rod 33 is a guide hole 25 of the regulating portion 25.
Sliding with 3. The rear end surface of the central portion 32 is urged forward by the spring 8 when mounted. The central portion 32 is obtained by extrusion molding of synthetic resin such as polypropylene, and the cleaning needle 31 is directly fixed (FIG. 1), or a through hole is provided in the central portion 32, and the central portion 32 is made of stainless steel. An example is one in which a pipe (the cleaning needle 31 is caulked at the tip) is attached (FIGS. 5 and 6).

After inserting the sliding member 3 into the central hole 22 and then inserting the tubular body 5 into the central hole 22 and incorporating the sliding member 3, an annular gap 41 is formed inside the tubular body 5 The annular gaps 42 are respectively arranged on the outer side of 5. The cylindrical body 5 is an extruded body of polyacetal resin, and a large number of minute ribs 51 in the axial direction are provided on the inside so as to project.

The inner annular gap 41 is surrounded from both sides by minute protrusions 321 and ribs 51 each having a capillary force by itself, and the minimum gap size (distance between the protrusions 321 and the ribs 51) is set to 0.1 mm. The minimum gap size of the outer annular gap 42 is 0.15 mm.
Set here.

The holder 62 is an injection-molded body of polyacetal resin. The rear end surface has a locking portion 63 with which the front end of the tubular body 5 abuts, a central hole 64 is formed in the center, and a ceramic thin tube 61 is press-fitted and fixed to the tip. The holder 62 is attached to the ink adjusting member 2
The writing tip 6 is obtained by fitting it into the front part. On the inner wall of the center hole 64, three ink guide recessed holes 65 are vertically provided at equal intervals in the axial direction, and a locking portion 63 on the rear end surface of the holder 62.
Has reached. The groove 65 has a deep end, and the locking portion 63 is provided with three inward projections 631.
As a result, the annular gap 41 and the annular gap 42 when the tubular body 5 is locked to the locking portion 63 form a communication state.

The shaft cylinder 7 is a so-called ink cartridge and has openings at both ends, and the plug body 7 is located slightly forward of the center of the shaft cylinder 7.
2. A tail plug 73 is fitted to the rear end to form an ink reservoir 71. The ink adjusting member 2 is inserted into the front end opening of the shaft cylinder 7, the plug 72 is removed from the fitting portion, and is retracted (opened) into the ink reservoir 71, and the reservoir 71 and the central hole are formed. 22 is connected, the ink is led out to the writing tip 6 through the annular gap 41 having the largest capillary force, and the air in the central hole 22 passes through the outer gap 42 and the ink reservoir 71 Is discharged to.

Incidentally, in the present embodiment, the minimum gap size of the inner annular gap 41 is made small and the capillary force is made strong, but on the contrary,
The minimum gap size of the outer annular gap 42 may be reduced, the capillary force may be strengthened to introduce the ink first, and the air may be discharged from the inner annular gap 41.

[Effect of device]

The thin-tube writing instrument of the present invention, due to the above-mentioned configuration, can quickly eject ink to the writing tip without deteriorating the ink adjusting function of the ink adjusting member at the time of assembling. Satisfactory sufficient ink supply and sufficient ink followability.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a capillary writing instrument of the present invention, FIG. 2 is a sectional view taken along the line AA, FIG. 3 is a sectional view taken along the line BB, and FIG.
-C line sectional view, FIG. 5 is a vertical sectional view of another embodiment of the sliding member, and FIG. 6 is a DD line sectional view. 1 ... thin tube type writing instrument 2 ... ink adjustment member, 21 ... ink flow rate adjustment groove (annular comb groove) 22 ... center hole 23 ... slit ink groove 3 ... sliding member, 31 ... cleaning needle 32 …… Central part 321 …… Projection 33 …… Guide rod 4 …… Annular gap, 41 …… Inner annular gap 42 …… Outer annular gap 5 …… Cylinder, 51 …… Rib 6 …… Writing tip Part, 61 ...... thin tube 62, holder 63, locking part, 7 shaft cylinder, 71, ink storage part 72, stopper 73, tail plug, 8 spring

Claims (1)

(57) [Scope of utility model registration request] 1. A thin tube (61) is attached to the tip, an ink flow rate adjusting groove (21) and a slit-like ink groove (23) extending longitudinally through the groove (21) are provided on the peripheral surface, and a central portion is provided at the axial center. A hole (22) is provided so that a sliding member (3) having a cleaning needle (31) at the front is inserted into the central hole (22), and the thin tube (61)
An ink adjusting member (2) having the cleaning needle (31) inserted therein and a shaft cylinder (7) having an ink reservoir (71) therein, and the ink adjusting member (2) is connected to the shaft. A thin-tube writing instrument of a type in which the ink reservoir (71) is opened by inserting the front end of a cylinder (7) so that the ink reservoir (71) and the central hole (22) communicate with each other. , The front end of the tubular body (5) is locked in the central hole (22) (6
The slide member (3) is loosely inserted and is inserted between the outer surface of the sliding member (3) and the inner surface of the tubular body (5), and between the outer surface of the tubular body (5) and the center hole (22).
An inner annular gap (41) and an outer annular gap (42) are formed between the inner surface and the inner surface so as to communicate with each other at the engaging portion (63), and the inner annular gap (41) is formed. And the outer annular gap (42) has a minimum gap size different from each other and larger than the minimum groove width of the ink flow rate adjusting groove (21), respectively.