JP2002225489A - Ink writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink writing utensil of such a structure that the supply of air to the interior of an ink tank part is smooth and secure when the internal pressure of the ink tank part is lower than an atmospheric pressure. SOLUTION: In the ink writing utensil of such a structure that an ink holder 131 is arranged in contact with an open rear edge face 63 where a slit 71 of an ink reservoir 11 is opened, the corner 67 of the outer peripheral part of the rear edge face 63 is shaped like an arc and a gap 151 leading to the slit 71 is partitioned. The outer periphery of the ink holder 131 comes into contact with ribs 143 formed in holes 7 of a body barrel 141 and a gap 147 leading to an ink tank part 75 is partitioned on both sides of each of the ribs 143.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink writing instrument, and more particularly, to an ink having a structure capable of reliably supplying air to the inside of a main body shaft when the pressure inside the main body shaft becomes lower than the pressure of the outside air. Writing instruments.

[0002]

2. Description of the Related Art Conventionally, a writing instrument such as a ball-point pen or a marker using ink has a structure in which ink is stored in an ink tank inside thereof and the ink is guided to the pen core via an ink guide core. There is. Here, when the ink or air inside the ink tank part is heated and expanded by the temperature of the user's hand or the outside temperature, when the ink overflows from the pen core or when the amount of ink is reduced by use, To prevent problems such as not supplying air to the inside of the ink tank smoothly, reducing the pressure inside the ink tank, not providing sufficient ink to the pen core and blurring characters, etc. Has been adopted.

FIG. 1 is a side cross-sectional view of a conventional marker 1, and FIG. 2 is a plan view of an ink reservoir 11 constituting an internal pressure control mechanism 2, and FIGS. (C) is an AA cross-sectional view, BB cross-sectional view, and C
It is -C sectional drawing. Since the right side of the marker 1 is used as the tip, the left and right sides in FIGS. 1 and 2 will be described as the front and the right side as the rear.

[0004] Reference numeral 3 denotes a main body shaft, which is formed in a cylindrical shape having a hole 7 therein, has an opening 9 at the front end, and is closed by the bottom 5 at the rear end.

[0005] The internal pressure control mechanism 2 includes an ink holding body 11 and an ink holding body 111 described later. As shown in FIG. 2, the ink reservoir 11 has a substantially cylindrical shape, and a large-diameter portion 15 having a larger outer diameter is formed at a position separated by a predetermined distance from the tip portion 13. Have been. The front side 19 of the large diameter portion 15 is a tapered surface whose diameter decreases toward the front. As shown in FIG. 2, an air groove 2 extending in the axial direction is provided on the outer periphery of the large-diameter portion 15.
1 is formed.

Behind the large diameter portion 15 is a bellows portion 25 inserted into the main body shaft 3, and has a tip portion 13 and a shaft portion 12 smaller in diameter than the large diameter portion 15, and a shaft portion 12 as described later.
Flanges 31 and 61 before and after expanding more radially outward,
It has a number of fins 41 formed between the flanges 31 and 61. That is, a front fitting flange 31 that fits into the hole 7 of the main body shaft 3 is formed rearward at a predetermined distance from the large diameter portion 15. The front fitting flange 31 is formed in such a size that the outer diameter is slightly tightly fitted in the hole 7 of the main body shaft 3. An air groove 33 having a substantially same width and a predetermined depth is formed at a position corresponding to the air groove 21 of the large diameter portion 15 in the circumferential direction.

A large number of fins 41 having an outer diameter slightly smaller than the inner diameter of the hole 7 of the main body shaft 3 are formed between the front fitting flange 31 and a rear fitting flange 61 described later. The fins 41 have substantially the same outer diameter and thickness, but are arranged such that the gap 43 between the fins 41 gradually decreases from the front to the rear. 1 and 3 (a),
As shown in (b), a groove 51 having a predetermined width and depth is formed on the side opposite to the air groove 33 of the front fitting flange 31 in the circumferential direction.

As shown in FIG. 2, the rear end of the ink storage body 11 has the same outer diameter as the front fitting flange 31 and has a longer axial length than the front fitting flange 31. It is a fitting flange 61. An angle 67 between the rear end face 63 and the outer peripheral face 65 of the rear fitting flange 61 is formed in an arc shape as shown in the figure.

The portion from immediately behind the second fin 47 from the front of the fin 41 to the rear end surface 63 of the rear fitting flange 61 is formed by the outer peripheral surface of the fin 41 and the outer peripheral surface 65 of the rear end portion 61. A slit 71 having a predetermined depth is formed on the side opposite to the groove 51 formed in the fin 41 in the circumferential direction.

As shown in FIG. 1, the ink reservoir 11 is configured such that the rear side surface 17 of the large diameter portion 15 is
, The rear part of the large diameter portion 15 is inserted into the hole 7 of the main body shaft 3, and the outer peripheral surface 35 of the front fitting flange 31 and the outer peripheral surface 65 of the rear fitting flange 61 are inscribed in the hole 7. Attached to shaft 3.

A through-hole 81 is formed in the ink reservoir 11, and as shown in FIG. 1, the through-hole 81 has a large-diameter portion 83 at the front end and a small-diameter portion 85 at the rear side. ing. A shoulder 87 is formed at a portion where the large diameter portion 83 moves to the small diameter portion 85. From the tip portion 13 side, the pen core 91
As shown in the figure, a rear portion 93 having the same outer diameter as the inner diameter of the large-diameter portion 83 is inserted, and the bottom surface 97 is attached to the shoulder 87. The pen core tip 95 is formed in a shape suitable for writing as shown in the drawing, and protrudes from the ink reservoir 11.

Reference numeral 101 denotes an ink guide, which guides ink stored in an ink tank 75 described later, which is sent via an ink holder 111 described later, to a pen core 91, and is made of a porous material. It is manufactured in. The ink guide core 101 has an outer diameter that is the same as the inner diameter of the small-diameter portion 85 of the through-hole 81 of the ink reservoir 11, and as shown in FIG. The rear end surface 105 is inserted into the small-diameter portion 85 so as to be flush with the rear end surface 63 of the ink reservoir 11.

The ink holder 111 is formed in a cylindrical shape having an outer diameter which is the same as the inner diameter of the hole 7 of the main body shaft 3. The ink holder 111 is always impregnated with ink,
This is for supplying ink to the ink guide core 101 and the slit 71. In this conventional example, a film wound batting in which cotton 115 is packed in a cylindrical film 113 is used. Ink holder 111
As shown in FIG. 1, the front face 117 contacts the rear end face 63 of the ink reservoir 11 where the slit 71 is opened,
The outer periphery 119 is arranged in contact with the inner periphery of the hole 7 of the main body shaft 3.

The ink holder 111 is located inside the hole 7 of the main shaft 3.
The space behind is an ink tank section 75 for storing ink.

The ink tank 75 of the main body shaft 3 is provided with a slit 71, a gap 43 between the fins 41 and a groove 51, and an air groove 3 of the front fitting flange 31 via an ink holder 111.
3. It can communicate with the outside air via an air groove 21 formed in the large diameter portion 15. However, in a normal state, the ink is stored by the surface tension in a state in which the portion of the rear fitting flange 61 of the slit 71 of the ink storage body 11 is substantially filled, so that the outside air is stored in the ink tank section 7.
5 does not enter, and ink does not leak from the pen core 91.

If the ink and air inside the ink tank 75 expands due to the heat of the user's hand and the pressure inside the ink tank 75 becomes higher than outside air, the expanded ink and air The ink corresponding to the amount is supplied from the ink tank unit 75 to the slit 71 opened in the rear end face 63 of the ink storage body 11 via the ink storage body 111, and is stored in the gap 43 between the slit 71 and the fin 41. You. Then, the air corresponding to the amount is discharged from the air groove 21 of the large diameter portion 15 to the outside air. Therefore, the pressure inside the ink tank unit 75 becomes equal to the outside air pressure, and the ink does not leak from the pen core 91.

On the contrary, when the pressure inside the ink tank 75 becomes lower than the outside air due to the decrease in the amount of ink inside the ink tank 75 using the marker 1, the slit 71 due to the surface tension is formed. The seal of the formed ink is broken, and air is introduced into the ink tank 75 through the above-described path from the air groove 21 of the large diameter portion 15 of the ink reservoir 11 and further through the ink holder 111. As a result, the pressure inside the ink tank 75 is the same as the outside air pressure. Therefore, the ink supply to the pen core 91 via the ink guide core 101 is smoothly performed.

Here, the action of the ink holding member 111 is such that even if the ink formed in the slit 71 is broken for any reason, the slit holding member 111 is quickly opened from the ink holding member 111.
1 to supply the ink to the nozzle 1, and has an effect of reliably forming a seal with the ink. This effect is particularly effective when an oil-based ink having a small surface tension and easy to break is used.

However, the ink holding member 111 formed of a film-wrapped batting and filled with ink has poor air permeability, and the air flows from the outside air to the ink tank portion 75 when the pressure of the ink tank portion 75 becomes lower than the outside air. The inflow is hindered by the ink holding body 111, and the supply of air to the ink tank unit 75 is not performed smoothly or reliably, and sufficient ink is not supplied to the pen core 91, so that writing often becomes impossible. I was

[0020]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and ensures that air is supplied to the inside of an ink tank when the pressure inside the ink tank is lower than the outside air. It is an object of the present invention to provide an ink cursive having a structure that can be obtained.

[0021]

In order to solve the above problems, the present invention provides an ink writing instrument having the following configuration. That is, it is formed in a cylindrical shape having a hole therein, one end is closed, the other end is formed in a cylindrical shape having a through hole, and the other end is formed in a cylindrical shape having a through hole, and one end is formed from an opening in the main body shaft. An ink reservoir that is inserted and attached to the inside of the hole by a predetermined length, the other end protrudes from the main body shaft, and on the protruding side, an ink reservoir that holds the writing member in the through hole; An ink holder that is arranged in contact with an end face of an end inserted therein and defines an inside of a hole on one end side of the main body shaft as an ink tank portion for storing ink; A guide core is disposed in the through hole of the body, one end of which is in contact with the writing member, the other end of which is in contact with the ink holder, and the ink supplied from the ink tank unit via the ink holder, and which guides the ink to the writing member. In the ink writing implement provided with the ink reservoir Has a communication path extending from the outside of the main body shaft to the end face of one end inserted into the inside of the main body shaft on the outer peripheral side, and the communication path is formed at least in a range of a predetermined length from the end face, in the axial direction. The ink writing implement further includes a passage communicating with the narrow groove of the ink reservoir and the ink tank portion. In the ink writing implement, a circumferential groove extending in the circumferential direction is formed at one end of the ink reservoir, and the passage communicates with the narrow groove through the circumferential groove. Further, the circumferential groove is formed in an outer peripheral portion of one end of the ink storing body.

A rib extending in the axial direction and protruding radially inward is provided on the inner peripheral side of the main body shaft at least in a range in which the ink holding member is housed. , And is formed by a gap formed by recessing the outer periphery of the outer periphery in the radial direction. Alternatively, the passage is constituted by a groove formed in the outer peripheral portion of the ink holding member so as to extend in the axial direction.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the scope of the present invention is not limited to the embodiments described below.

FIG. 4A is a side sectional view of the marker 121 according to the present embodiment, and FIG.
It is DD sectional drawing in (a). Marker 121
Is the same as the conventional marker 1 shown in FIG. 1 except for a part of the shape of an ink holder 131 and a main body shaft 141 described later. The same members are denoted by the same reference numerals, and detailed description thereof will be made. Is omitted.

As shown in FIG. 4A, the inner periphery of the main body shaft 141 has a predetermined height in the axial direction between the portion where the ink holder 131 is disposed and the ink tank portion 75. Ribs 143 that protrude and extend in the axial direction are formed at four positions. In the present embodiment, the rib 143 is also formed on the inner periphery of the ink tank unit 75, but it is sufficient that the rib 143 is formed at least on the inner periphery of the portion where the ink holder 131 is arranged. Also, the number is not limited to four, and at least one or more may be formed.

The ink holding member 131 may be the same as the conventional ink holding member 111 shown in FIG. 1, and is manufactured as a film wound batting in which cotton 135 is packed in a cylindrical film 133. Have been. However, when it is disposed inside the hole 7 of the main body shaft 141, as shown in FIG. 4B, the portion in contact with the rib 143 formed on the inner periphery of the hole 7 has a concave shape. A gap 147 is formed on both sides of the rib 143.

The ink holding member 131 has a front surface 13.
7 is replaced with an ink reservoir 11 as shown in FIG.
Are arranged in contact with the rear end face 63 where the slit 71 is opened. However, as described above, the rear end surface 63 of the ink storage body 11 has an arc 67 at the corner 67 with the outer peripheral surface 65 of the rear end portion 61, so that the left end surface 145 of the rib 143 in the drawing is shown. An annular gap 151 is formed between the marker 121 and the front surface 137 of the ink holding body 131, and the configuration of the marker 121 according to the present embodiment has been described so far as the gap 151 is connected to the gap 151. The operation will be described.

When the pressure inside the ink tank section 75 becomes higher than the pressure of the outside air, it is the same as the conventional example.

When the pressure inside the ink tank 75 becomes lower than the pressure of the outside air, the outside air is introduced from the air groove 21, passes through the slit 71, and passes through the gap 1.
51, and is supplied to the inside of the ink tank unit 75 through the gap 147, and has the same pressure as the outside air.

As described above, as the first embodiment, the embodiment using the gap 147 generated when the ink holder 131 is in contact with the rib 143 has been described. An embodiment in which a gap is generated in the case will be described.

FIG. 5A is a side sectional view of the marker 161 according to the second embodiment of the present invention.
(B) is an EE cross-sectional view of FIG. The marker 161 is different from the marker 1 of the conventional example shown in FIG. 1 only in the ink holding member 171, and the same reference numerals are used for other equivalent members, and the description is omitted.

As shown in FIG. 5B, the ink holder 171 is composed of an outer frame 173 formed in a substantially cylindrical shape, and cotton 175 packed in the through hole of the outer frame 173. I have. The outer frame 173 is a molded product of a resin or the like, and has grooves 177 formed at four locations extending in the outer peripheral portion in parallel with the axis over the entire length in the axial direction. In this embodiment, the groove 17
Although seven are formed, at least one or more may be provided.

As shown in FIG. 5A, the ink holding body 171 has an outer circumference 181 in contact with the inner circumference of the hole 7 of the main body shaft 3 and a rear end face 63 where the slit 71 of the ink holding body 11 is opened. Is arranged in contact with the front surface 179 thereof. FIG.
As shown in (b), the inside of the groove 177 of the outer frame 173 is surrounded by the inner periphery of the hole 7 to form a gap 183.

The configuration of the second embodiment of the present invention has been described above. The operation of the marker 161 will be described below.

When the pressure inside the ink tank 75 becomes higher than the pressure of the outside air, the operation is the same as that of the conventional example.

When the pressure inside the ink tank 75 becomes lower than the pressure of the outside air, the air is supplied to the inside of the ink tank 75 through the slit 71, the gap 151 communicating with the slit 71, and the gap 183. And the same pressure as the outside air.

Although the markers 121 and 161 according to the first embodiment and the first embodiment have been described above,
In addition to the marker, the present invention can be applied to a ballpoint pen 191 having a ballpoint pen tip 193 at the tip, as shown in FIG. 6, or a writing body using ink such as a fountain pen.

As described above, as the first and second embodiments, the slit 71 and the ink tank portion 75 are communicated with each other through the gap 151 existing on the outer periphery of the rear end face 63 of the rear fitting flange 61 of the ink reservoir 11. Although the configuration is shown, a third embodiment different from that is described below.

FIG. 7A is a side sectional view of the marker 201 according to the third embodiment of the present invention, and FIG.
FIG. 8 is a sectional view taken along line FF of FIG. Marker 201
Is substantially the same as the conventional marker 1 shown in FIG. 1, but only a part of an ink storage body 211 and an ink storage body 221 to be described later is different, and the same members are denoted by the same reference numerals. This will be described below.

The ink reservoir 211 is substantially the same as the ink reservoir 11 in the conventional example of FIG.
As shown in (a), a circumferential groove 213 recessed in the circumferential direction at a predetermined position in the radial direction is formed in the rear end face 63 of the rear fitting flange 61.

The ink holding member 221 is substantially the same as the ink holding member 111 in the conventional example.
As shown in (a), four through holes 223 extending in the axial direction are formed at positions corresponding to the circumferential grooves 213 of the ink reservoir 211.

The circumferential groove 213 and the through hole 223 correspond to the gap 151 and the gap 14 in the first embodiment, respectively.
7. Gap 151 and Gap 18 in Second Embodiment
It performs the same function as 3.

[0043]

As can be seen from the above description, according to the present invention, when the pressure of the ink tank 75 becomes lower than the pressure of the outside air, the air is smoothly and reliably supplied to the ink tank 75, and The supply of ink to the pen core 91 via the induction core 101 is performed smoothly.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a conventional marker 1. FIG.

FIG. 2 is a plan view of the ink reservoir 11.

FIG. 3 is a cross-sectional view of FIG. 2;
(B) is a BB cross-sectional view, and (c) is a CC cross-sectional view.

FIG. 4 shows a marker 1 according to the first embodiment of the present invention.
21A is a side sectional view, and FIG. 21B is a DD sectional view.

FIG. 5 shows a marker 1 according to the second embodiment of the present invention.
61A is a side sectional view, and FIG. 61B is an EE sectional view.

FIG. 6 is a side sectional view of a ballpoint pen 191 according to the second embodiment of the present invention.

FIG. 7 shows a marker 2 according to the third embodiment of the present invention.
(A) of FIG. 01 is a side sectional view, and (B) is an FF sectional view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conventional marker 3 main body shaft 7 hole 11 ink reservoir 21 air groove 33 air groove 71 slit 73 opening 75 ink tank unit 91 pen core 101 ink guide core 111 ink holder 121 Marker according to an embodiment of the present invention 143 Rib 147 Gap 151 Gap 161 Marker 171 according to an embodiment of the present invention 171 Ink holder 173 Outer frame 177 Groove 183 Gap 191 Ballpoint pen 201 according to an embodiment of the present invention 201 Marker 211 ink according to an embodiment of the present invention Reservoir 213 Circumferential groove 221 Ink holder 223 Through hole

Claims (5)

[Claims] 1. A cylindrical body having a hole therein, one end of which is closed and the other end thereof is formed in a cylindrical shape having a through hole, and one end is formed in a cylindrical shape having a through hole. An ink reservoir inserted and attached to the inside of the hole through the opening having a predetermined length, the other end protruding from the main body shaft, and holding a writing member in the through hole on the protruding side; The ink reservoir is disposed in contact with an end face of an end inserted into the hole of the main body shaft, and defines the inside of the hole on the one end side of the main body shaft as an ink tank portion for storing ink. An ink holder that can be impregnated with ink; and an ink holder that is disposed in the through hole of the ink reservoir and has one end in contact with the writing member and the other end in contact with the ink holder. Ink supplied through the body, In an ink writing implement having a guide core for guiding to a writing member, the ink reservoir has a communication passage extending from the outside of the main body shaft to the end face of the one end inserted inside the main body shaft on the outer peripheral side. The communication path includes a narrow groove formed in at least a predetermined length from the end face and extending in the axial direction. The ink writing implement further includes the narrow groove of the ink reservoir. An ink writing implement having a passage communicating between the ink writing unit and the ink tank unit. 2. The ink writing implement according to claim 1, wherein the ink writing implement has a circumferential groove extending in a circumferential direction at the one end of the ink storage body.
The ink writing implement, wherein the passage communicates with the narrow groove through the circumferential groove. 3. The ink writing implement according to claim 2, wherein the circumferential groove is formed in an outer peripheral portion of the one end of the ink storage body. 4. The ink writing instrument according to claim 3, wherein a rib extending in the axial direction and rising inward in the radial direction is provided on an inner peripheral side of the main body shaft at least in a range where the ink holding body is housed. The ink writing implement, wherein the passage is constituted by a gap formed by the rib abutting on the outer periphery of the ink holding member and depressing the outer periphery inward in the radial direction. 5. The ink writing implement according to claim 3, wherein the passage is constituted by a groove formed in an outer peripheral portion of the ink holding member so as to extend in an axial direction.