JP2512347Y2 - Writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a writing instrument in which an ink adjusting member is interposed between an ink reservoir and a writing tip. More specifically, the present invention relates to a writing instrument including an ink adjusting member having a double structure capable of controlling outflow of a large amount of ink.

[Conventional technology]

Conventionally, various ink adjusting members have been disclosed as those that are inserted between the writing tip and the ink reservoir to temporarily hold ink in response to pressure changes, and are used in fountain pens and Kosuge writing instruments. Widely used.

The ink adjusting member is generally obtained by plastic injection molding, and examples thereof include a type having a large number of comb grooves and a type having a meandering extending equilibrium chamber inside and outside.

Among the conventional ink adjusting members, a comb groove type member generally has a small ink holding amount, and therefore cannot overflow ink for a volume expanded due to an increase in internal pressure of the ink storage portion, and often falls off. In some cases, the ink reservoir had to be set to a small volume in advance.

Further, in order to increase the amount of the ink adjusting member accommodated, it is conceivable that the ink adjusting member has a large diameter and the comb groove depth is deeper than the conventional one, but the groove width must be set smaller. There was a problem in mold making and injection molding.

Further, in the ink adjusting member of the type having a meandering extending equilibrium chamber, the ink flow passage reciprocates between the inner side and the outer side to secure the ink holding amount, but bubbles tend to remain in the middle of the flow passage, which makes it smooth. It tends to obstruct the circulation of various inks and cause smearing of handwriting.

The present invention solves the above-mentioned problems and facilitates mold making, molding, and assembly work, etc., and quickly fulfills the adjusting function even when pressure, temperature change, impact, etc. occur, Always gives normal writing performance without causing troubles such as ink leakage from the tip, blowing out, etc.
The present invention provides a writing instrument that has an ink adjusting member capable of controlling outflow of a large amount of ink and that satisfies a sufficient writing distance.

[Means for solving problems]

In the writing instrument of the present invention, the ink adjusting member 2 having a double structure in which the first ink adjusting member 21 and the second ink adjusting member 22 are externally inserted is attached to the tip of the barrel 5 having the ink reservoir 51. In the writing instrument, the first ink adjusting member 21 has a plurality of annular comb groove portions formed by a plurality of comb teeth on the outer periphery thereof.
21a, an axial slit-shaped ink groove 21b that connects the plurality of comb groove portions 21a to each other, and an air replacement groove 21c that is formed in the comb teeth in the axial direction by a notch, and includes a second ink adjusting member 22. However, on its outer circumference, a plurality of annular comb groove portions 22a formed by a plurality of comb teeth, an axial slit-like ink groove 22b that connects the plurality of comb groove portions 22a, and a shaft formed by a notch in the comb teeth. And an air exchange groove 22c formed in the direction, the comb groove portions 21a, 22a and the ink storage portion 51 are communicated with each other through the slit-shaped ink grooves 21b, 22b.
The ink supply core 3 for leading out the ink to the writing tip 4 is inserted into the center hole 21d of the ink adjusting member 21 and the rear end of the ink supply core 3 is connected to the ink reservoir 51. ..

The ink adjusting member 2 is formed of a plastic injection molded body. The first and second ink adjusting members 21, 22 are
Both are provided with comb groove portions 21a and 22a, slit-shaped ink grooves 21b and 22b, and air replacement grooves 21c and 22c. Since each of the above-mentioned constituent elements does not communicate with each other, they each independently perform an ink adjusting function.

As the ink supply core 3, a resin processed body of fiber bundle, a plastic porous body, a plastic molded body having a through hole in the axial direction, or the like is appropriately selected.

Furthermore, the ink supply core 3 may be formed as a single body so as to also function as the writing tip 4, or may be connected to the writing tip 4 by combining a plurality of types having different capillary forces.

[Action]

In the writing instrument of the present invention, when the air in the ink reservoir 51 expands due to temperature rise, the expanded volume of ink is transferred from the ink reservoir 51 to the first and second ink adjusting members.
It is retained in comb groove portions 21a, 22a which flow into the slit-shaped ink grooves 21b, 22b of 21, 22 and communicate with the ink grooves 21b, 22b.

On the other hand, the ink in the ink reservoir 51 is consumed from the writing tip 4 through the ink supply core 3, and when the inside of the ink reservoir 51 becomes a negative pressure, the ink retained in the comb grooves 21a, 22a is The air is discharged into the ink reservoir 51, and at the same time, the outside air is sent into the ink reservoir 51 through the air replacement grooves 21c and 22c.

The adjusting action of the ink inflow and discharge and the air exchange described above is
The first and second ink adjusting members 21 and 22 are performed independently of each other, and the ink adjusting member 2 performs an ink adjusting function that integrates the respective functions of both members, and enables application of a large amount of ink.

〔Example〕

The writing instrument of the present invention will be described with reference to the drawings. (See FIG. 1 to FIG. 3) The shaft cylinder 5 is a bottomed cylinder having an opening on one side,
The ink adjusting member 2 is fitted on the front side, and an ink reservoir 51 is formed on the rear side.

The ink adjusting member 2 is attached to the first ink adjusting member 21 in the second position.
The ink adjusting member 22 is externally inserted.

The second ink adjusting member 22 has a central hole 22d for inserting the first ink adjusting member 21 in the center thereof, and an inward projection for fitting with the first ink adjusting member 21 in the rear part.
22e is projected. A large number of comb teeth are arranged in the radial direction on the outer periphery to form an annular comb groove portion 22a for holding ink by a capillary force. A slit-shaped ink groove 22b is provided in the comb groove portion 22a in the axial direction, and an air replacement groove 22c formed by a notch is vertically provided on the opposing peripheral surface of the ink groove 22b to independently perform ink adjustment.

Similar to the second ink adjusting member 22, the first ink adjusting member 21 is provided with a comb groove portion 21a on the outer periphery, and a slit-shaped ink groove 21b and an air exchange groove 21c in the axial direction. In order to satisfy the simultaneity of the inflow and discharge actions of the ink to the ink adjusting member 22 and prevent uneven distribution, the shape and size are set according to the second ink adjusting member 22.
Further, a holder portion 21f for holding the writing tip is formed in a taper shape in the front portion of the member 21, and a shoulder portion 21g is formed in the rear portion of the holder portion 21f. 2
By locking with the front end of 2, the rearward movement of the member 21 in the inserted state is prevented.

A central hole 21d for inserting the ink supply core 3 is provided through the center of the first ink adjusting member 21, and in particular, a stopper step portion 21e for fitting and fixing the writing tip 4 is provided in the front portion. .

The ink supply core 3 is a resin processed body of a fiber bundle, but here, the front portion is processed into a pen tip shape so as to also function as the writing tip 4.

At the time of assembly, the first ink adjusting member 21 and the second ink adjusting member 22 may be fixed at any positions in the circumferential direction.
Slit-shaped ink grooves 21b and 22 as illustrated in FIGS.
b. The air exchange grooves 21c and 22c need not be fixed at the same position in the circumferential direction, and even if they are fixed at arbitrary positions, since both members are independent of each other, there is no problem in the ink adjusting function.

[Effect of device]

The writing instrument of the present invention can accommodate a large amount of ink (2 to 3 times as much ink as a writing instrument to which a conventional ink adjusting member is applied), and of course, the ink adjusting member functions independently of the first and second ink adjusting members. Therefore, unlike the conventional ink adjustment member with a long meandering equilibrium chamber, it is possible to immediately respond to a slight change in the internal pressure of the ink reservoir and control the smooth ink inflow and outflow. It does not cause problems such as dropping and scraping.

Further, since the ink adjusting member has a double structure, the comb groove depth can be set to the same level as the conventional one or shallower than the conventional one in spite of the large diameter, and the mold making and the injection molding are facilitated.

As described above, the writing instrument of the present invention, as a writing instrument containing a large amount of ink, can maintain proper writing performance and can perform long-distance writing without causing the above-mentioned troubles in practical use.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of the writing instrument of the present invention, and FIGS. 2 and 3 are sectional views taken along the lines AA and BB of FIG. 1 ... Writing instrument 2 ... Ink adjusting member 21 ... First ink adjusting member 22 ... Second ink adjusting member 21a, 22a ... Comb groove portions 21b, 22b ... Slit-like ink grooves 21c, 22c ... Air Alternate grooves 21d, 22d …… Central hole 21e …… Stopper step 21f …… Holder 21g …… Shoulder 22e …… Inward projection 3 …… Ink supply core 4 …… Writing tip 5 …… Shaft cylinder 51 …… Ink reservoir

Claims (1)

(57) [Scope of utility model registration request] 1. A double-structured ink adjusting member (2) in which a second ink adjusting member (22) is externally fitted to a first ink adjusting member (21), and an ink reservoir (51). A writing instrument attached to the tip of a barrel (5), wherein a first ink adjusting member (21) has a plurality of annular comb groove portions (21a) formed by a plurality of comb teeth on the outer periphery thereof. The plurality of comb grooves (21
Axial slit-shaped ink groove (21b) that connects a)
And an air replacement groove (21c) formed in the comb teeth in the axial direction by a notch, the second ink adjusting member (22)
On the outer periphery thereof, a plurality of annular comb groove portions (22a) formed by a plurality of comb teeth, an axial slit ink groove (22b) communicating the plurality of comb groove portions (22a), and the comb Air replacement groove (22
c), and the slit-shaped ink grooves (21b, 22b) for forming the comb groove portions (21a, 22a) and the ink reservoir portion (51) respectively.
And the ink supply core (3) for leading the ink to the writing tip (4) is inserted into the center hole (21d) of the first ink adjusting member (21), and the ink supply core (3) is connected. Writing instrument (1) having a rear end connected to an ink storage section (51).