JP2001191682A - Writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing utensil, in which no effusion of ink occurs even under abrupt change of pressure due to the enough ink storing function demonstrated by an ink storing member. SOLUTION: The ink storing member 12 is to temporarily store the ink effused in response to the change of the pressure in an ink tank 10 from an air replacing hole 24 through an ink guiding groove 22 in an ink storing groove 20 and arranged in a barrel 14. Respectively, the two or more air replacing holes 24 and the ink guiding grooves 22 (or the air replacing holes 24A and 24B and the ink guiding grooves 22A and 22B). The capillary force of one air replacing hole 24A is formed to become stronger than that of the other air replacing hole 24B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing implement having an ink storage member in a shaft cylinder for temporarily storing overflowing ink according to a pressure change in an ink tank.

[0002]

2. Description of the Related Art Generally, in a writing instrument, as shown in FIG. 3, a temporary ink reservoir member (also referred to as a collector) a has a centrally formed insertion hole c for passing an ink relay core b along an axial direction. A so-called wing-shaped thin plate portion d is formed in the peripheral portion in an axially layered manner with a gap e therebetween, and a longitudinal groove f connecting the gap e is formed in each thin plate portion d along the axial direction. The ink reservoir member a is provided in the barrel g of the writing instrument.

[0003] Insertion of the ink reservoir member a in the shaft cylinder g is performed as follows.
As disclosed in Japanese Utility Model Laid-Open No. 6-12083,
The ink reservoir member a is fitted into the inner wall of the shaft cylinder g at the front and rear portions, and the internal space formed by the ink reservoir member rear end plate-shaped portion h and the shaft cylinder g is defined as an ink tank i. The rear end plate-shaped portion h of the ink reservoir member a is a partition wall at the front end of the ink tank i, and as shown in FIG.
One air replacement hole j communicating the ink tank i and the vertical groove f to the vicinity is formed in the radial direction.

[0004]

As described above, the conventional air displacement hole j is formed at one location in a groove-like shape extending on the outer diameter side. The ink can be smoothly moved between the ink reservoir member a and the ink tank i without any problem when the ink flows in and out. However, in the case of a sudden pressure change, for example, when the cap is removed under a low pressure environment, the ink tank i
The inside is relatively high in pressure against the outside air, and the ink is pushed out by this pressure difference. However, the ink is hard to enter the ink reservoir member a due to the rapid pressure change, and the pushed out ink may blow out from the pen tip. There was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and can sufficiently exhibit ink storage performance during normal use, and can sufficiently store ink when a sudden change in pressure occurs. It is an object of the present invention to provide a writing implement that exhibits a function and does not cause the ejection of ink.

[0006]

The present invention has the following arrangement to achieve the above object. According to the present invention, an ink reservoir member in which a blade-like thin plate portion is arranged in a layered manner in the axial direction with a gap therebetween, and a longitudinal groove connecting the gap in each thin plate portion along the axial direction is provided in the shaft cylinder. The ink reservoir member is a writing implement for temporarily storing overflowing ink corresponding to a pressure change in the ink tank in a gap through a vertical groove from an air replacement hole facing the ink tank. A writing instrument, wherein a plurality of grooves are formed, a rear end of the ink reservoir member is formed in a plate-like portion thicker than the thin plate portion, and a plurality of air replacement holes continuous with the longitudinal grooves are provided in the plate-like portion. It is. In the present invention, there is provided a writing instrument, wherein at least one of the plurality of air replacement holes is formed so as to have a stronger capillary force than other air replacement holes.

According to the writing instrument of the present invention, since a plurality of continuous air replacement holes are provided in the vertical groove of the plate-like portion, even when the width of the air replacement holes is equal, when the pressure change is slow,
The air displacement holes function as the same as one ink reservoir member, and each air displacement hole functions in the same way to exhibit ink storage capacity. On the other hand, when the pressure changes rapidly, there are a plurality of air displacement holes, so the air displacement holes However, as compared with a single ink reservoir member, the flow of the ink is improved, and the ink can be quickly moved into the ink reservoir member. Further, in the present invention, by forming at least one air displacement hole so that the capillary force is stronger than the other air displacement holes, the air displacement hole having a weak capillary force functions when the pressure change is slow. On the other hand, when the pressure change is abrupt, the air displacement hole having a weak capillary force and the air displacement hole having a strong capillary force also function to smoothly move the ink into the ink reservoir member. In the present invention, the setting of the capillary force of each air replacement hole is performed by a groove width, and a vertical groove is continuously formed for each air replacement hole,
The groove width of the vertical groove can be formed in accordance with the continuous air replacement hole, which allows each air replacement hole to be formed together with the vertical groove. It's easy to do.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a writing instrument provided with an ink reservoir according to the embodiment, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

[0009] As shown in FIG.
Are formed in the center portion along the axial direction with the insertion holes 34 of the ink relay core 26, and the thin plate portions 18, 18... Are formed in the peripheral portion in a layered manner in the axial direction with a gap (ink storing groove 20). ,
Further, vertical grooves (ink guide grooves) 22 (22A, 22B) connecting the ink storage grooves 20 are formed in the thin plate portions 18, 18,... Along the axial direction. Then, the ink reservoir 12 is provided with the ink reservoir 20 through which the overflow ink corresponding to the pressure change in the ink tank 10 flows from the air replacement hole 24 facing the ink tank 10 through the ink guide groove 22.
It is temporarily stored in the inside, and is arranged in the shaft cylinder 14.

That is, in this writing instrument, an ink reservoir member 12 is provided in front of the ink tank 10 of the barrel 14. The ink reservoir member 12 has a substantially tubular central tubular portion 12a formed in the center thereof, and a disc-shaped plate-like portion 16 disposed at the rear end of the central tubular portion 12a so as to extend vertically.
4 is fitted to the inner periphery of the main body and formed watertight. A structure in which a plurality of thin disk-shaped thin plate portions 18 are stacked in front of the rear end plate-shaped portion 16 is provided.
8, 18 ... Ink storage groove (lateral groove) 2 by capillary force
0 is formed.

The plurality of thin plate portions 18 are formed with slit-like ink guide grooves 22 along the length direction of the ink reservoir member 12 except for the central cylindrical portion 12a. The groove width of the ink guide groove 22 is made smaller than any groove width of the ink storage groove 20 so that the ink is always filled, and the excess ink when the pressure in the ink tank 10 rises is reduced.
It can be guided immediately to zero. The ink guide grooves 22 are formed between the thin plate portions 18 and are continuous with the air replacement holes 24 (24A, 24B) that open into the ink tank 10 of the plate portion 16.

That is, the rear end of the ink reservoir member 12 is formed in a plate-like portion 16 thicker than the thin plate portions 18, 18,... It has a structure that closes the tip, and has an air replacement hole 24 that is continuous with the ink guide groove 22 of the plate-shaped portion 16.
Is formed. In the embodiment, two air replacement holes 24 and two ink guide grooves 22 are formed (air replacement holes 24A and 24B and ink guide grooves 22A and 22B), and one air replacement hole 24A is separated from the other air replacement holes 24B. Are also formed so that the capillary force becomes strong. In this case, the capillary force of each of the air replacement holes 24A and 24B is set by the groove width (groove width 24A <24B).
A, the longitudinal grooves 22A, 22B are formed continuously for each 24B,
The groove widths of the vertical grooves 22A and 22B are formed to have a width corresponding to the continuous air replacement hole (the air replacement hole 24A and the vertical groove 22A have the same width as the air replacement hole 24B and the vertical groove 22B). As a preferable size of the air replacement hole, one of the air replacement holes 24A is 0.01 to 0.1 mm, and the other air replacement hole 24B is 0.01 to 0.2 mm.

The laminated thin plate portion 18 of the ink reservoir member 12 is integrally formed with a structure in which the central portion is connected and supported by the hollow central cylindrical portion 12a. A relay core 26 made of a fiber core or the like is housed in the insertion hole 34 on the inner periphery of the central cylindrical portion 12a.
To supply the ink in the ink tank 10 to the pen tip 28 provided at the tip of the barrel 14. A cutout 30 serving as an air passage is formed on the outer periphery of the thin plate portion 18 of the ink reservoir member 12 so as to extend in the longitudinal direction of the ink reservoir member 12. The pen tip 28 is attached to the large-diameter cylindrical portion 12b extending to the tip of the ink reservoir member 12. A cylindrical holder 32 is fitted and fixed between the outer periphery of the front part of the ink reservoir member 12 and the inner periphery of the front part of the shaft cylinder 14 including the large-diameter cylindrical part 12b. Further, an air passage is formed between the groove 12c on the outer periphery of the large-diameter cylindrical portion 12b and the inner periphery of the holder 32, and communicates with the air replacement hole 24 through the air passage of the notch 30. ,
The gas-liquid replacement of the ink tank 10 is performed smoothly.

Here, the rear end of the ink reservoir member 12 is formed in a plate-like portion 16 having a constant thickness, and the ink tank 10 is formed in the rear portion of the inside of the shaft cylinder 14. A pair of convex portions 36 and 38 spaced apart in the axial direction is formed on the inner periphery of the shaft cylinder 14, and the plate-like portion 16 of the ink reservoir member 12 is pressed into the inner periphery of the shaft cylinder 14 and the pair of convex portions 36 , 3
The plate-shaped portion 16 faces the ink tank 10 by being fitted and fixed in the gap 8.

The front convex portion 36 is a continuous or discontinuous annular rib formed so as to surround the inner peripheral surface of the barrel 14. The rear convex portion 38 is a portion that is stepwise raised toward the inner peripheral surface of the ink tank 10. The ink reservoir member 12 has a plurality of thin plate portions 18.
A relatively thick plate-like portion 42 is also formed at an intermediate position where the plate-like portion 42 is arranged, and a protrusion 44 that the plate-like portion 42 rides over the inner periphery of the shaft cylinder 14 and abuts on the front corner of the plate-like portion 42 is formed. It is formed in the shape of a ring and has a retaining shape.

According to the writing instrument of the embodiment, as shown in FIGS. 1 and 2, a plurality of air replacement holes are formed in the plate-like portion 16 and are continuous with the vertical grooves, and one air replacement hole 24A is replaced with another air replacement hole. Since the capillary force is formed to be stronger than the hole 24B, the air displacement hole 24B having a weak capillary force functions when the pressure change is slow, and the air having a weak capillary force works when the pressure change is rapid. In addition to the replacement hole 24B, the other air replacement hole 24A having a strong capillary force also functions to move the ink into the ink reservoir member 12. The capillary force of each of the air replacement holes 24A and 24B is set by the groove width, and the vertical grooves 22A and 2B are continuously provided for each of the air replacement holes 24A and 24B.
2B, and the width of the vertical grooves 22A, 22B can be formed in accordance with the air replacement holes continuous therewith, whereby the air replacement holes 24A, 24B can be formed in the vertical grooves 22A, 22B.
Since it can be formed together with 22B, the mold becomes linear and injection molding is easy.

The present invention is, of course, not limited to the above-described embodiment. In addition to forming a plurality of air displacement holes and a plurality of longitudinal grooves with different groove widths, the present invention is not limited thereto. Each of the grooves can be formed so as to have the same capillary width and the same capillary force. The air replacement holes may be formed in three or more places instead of two places. Also,
The ink tank may use a cartridge type,
In this case, it is preferable to adopt a structure in which the plate portion of the ink reservoir member is fitted into the cartridge opening.

[0018]

As described above, according to the present invention, since a plurality of continuous air replacement holes are provided in the vertical groove of the plate-like portion, the pressure change is slow even if the width of the air replacement holes is equal. Sometimes, the air displacement holes function as the same as one ink reservoir member, and the air displacement holes function in the same manner to exhibit the ink retaining ability. On the other hand, when the pressure change is rapid, there are a plurality of air displacement holes, As compared with a single ink reservoir member, the replacement hole makes the flow of ink better, and the ink can move quickly into the ink reservoir member. Further, a plurality of continuous air replacement holes are provided in the vertical groove of the plate-shaped portion, and at least one air replacement hole is formed so that the capillary force is stronger than other air replacement holes, so that the pressure change is slow. Sometimes, the air displacement hole with weak capillary force functions, while when the pressure change is rapid, the air displacement hole with weak capillary force works together with the air displacement hole with weak capillary force to store the ink in the ink reservoir. You can move.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a writing instrument according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the writing instrument taken along the line II-II in FIG.

FIG. 3 is an explanatory view of a conventional writing instrument.

FIG. 4 is a cross-sectional view of a main part along a line IV-IV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tank tank 12 Ink storing member 14 Shaft barrel 16 Plate part 18 Thin plate part 20 Ink storing groove 22 (22A, 22B) Ink guiding groove 24 (24A, 24B) Air replacement hole 34 Insertion hole

Claims (2)

[Claims] An ink reservoir member in which blade-like thin plate portions are arranged in a layered manner in the axial direction with a gap therebetween, and a longitudinal groove connecting the gaps in each thin plate portion along the axial direction is provided in the shaft cylinder. Have
This ink reservoir member is a writing instrument for temporarily storing overflowing ink according to the pressure change in the ink tank from the air replacement hole facing the ink tank through the vertical groove into the gap. A writing implement, wherein a plurality of the ink reservoir members are formed at a rear end of the plate portion thicker than the thin plate portion, and the plate portion is provided with a plurality of air replacement holes continuous with the longitudinal grooves. 2. A writing instrument, wherein at least one of the plurality of air replacement holes is formed so as to have a higher capillary force than the other air replacement holes.