JP2012111192A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument that can secure water vapor barrier properties with a collector which directly holds a writing part without need of parts, such as a joint, can make a diameter of a seal part small by sealing the collector with a cap and can make increase of the internal pressure in an ink tank when using a cap into a range without generating a pumping phenomenon.SOLUTION: The collector 20 is prepared between the ink tank 10 and a writing part 12 at a tip side and has an ink guide part 14 inserted in a length direction. The writing instrument has the integrally formed collector 20 which is a regulating object which preserves ink by a reservoir part 24 which utilizes capillary force via a gas-liquid exchange part 22 when adjusting the pressure in the ink tank 10, and the writing part 12 is held at the end of the collector 20. In the writing instrument, a seal part 26 of the cap 18 is formed at a tip end of the collector 20, and an air exchange hole 28 which leads to the ink tank 10 inside the seal part 26 is provided.

Description

  The present invention relates to a writing instrument having a collector in an ink tank.

  The collectors provided in conventional writing instruments require wettability in function and require dimensional stability, so they are often made of ABS resin, and etching treatment is performed in the product state after molding to obtain more sufficient functions. A process for enhancing the wettability by the formation of the uneven surface by the plasma treatment and the plasma treatment is performed.

  ABS is a resin material that has a low water vapor barrier property and, when used as a sealing member, tends to cause volatilization of ink during long-term storage. As a countermeasure, a collector (ink reservoir) is disposed at the tip of the ink tank formed of PP (polypropylene), which is a resin material having excellent water vapor barrier properties. At the tip, a joint formed of a material having excellent water vapor barrier properties that holds the pen tip is arranged so that it can be sealed with the ink tank, and sealing with the cap is performed by this joint. Measures are taken to prevent ink volatilization from the collector (see Patent Document 1: Structure of JP-A-2004-42292).

  In the collector having a structure in which the writing part (chip) is directly held, since no joint is provided at the tip part, it is necessary to prevent ink volatilization by sealing the cap and the ink tank (Patent Document 2: Japanese Patent Laid-Open No. 2-599942). Gazette, patent document 3: see Japanese Utility Model Publication No. 2-58979). In this case, since the outer diameter portion of the ink tank becomes the seal portion, the volume change during sealing is large, and the pressure inside the ink tank increases. This pressure increase causes ink to be pushed out into the collector when the cap is turned off. By repeating this operation, a so-called pumping phenomenon occurs in which ink is finally ejected from the air replacement hole at the tip of the collector or the pen tip. .

  As a countermeasure, a structure is known in which the cap has a double structure and the inner cap is movable so that the volume after sealing is not changed and the internal pressure is not changed (Patent Document 4: Japanese Patent Application Laid-Open No. 2002-205490). See the official gazette). However, this structure cannot avoid an increase in cost due to an increase in the number of parts and assembly costs, and it is difficult to adopt at present when a writing instrument that can be produced at low cost and can be provided at a low price is required. In addition, this method has a drawback in that the effect of suppressing volatilization is low by a normal fitting method because the working inner cap is sealed against the joint by a spring or the like.

JP 2004-42292 A Japanese Utility Model Publication No. 2-599842 Japanese Utility Model Publication No. 2-58979 JP 2002-205490 A

  In view of such circumstances, the present invention secures a water vapor barrier property with a collector that directly holds a writing portion without requiring parts such as a joint, and reduces the seal portion diameter by sealing with a collector and a cap. A writing instrument is provided that can increase the pressure in the ink tank at the time of capping within a range in which no pumping phenomenon occurs.

The present invention includes an ink tank for storing low-viscosity ink in a liquid state therein, an ink guiding section capable of sending ink between the ink tank and the writing section, and a main body so as to cover the writing section when not in use. And a cap that fits into the
A collector in which the ink guiding part is inserted in the length direction and provided between the ink tank and the tip writing part, and the capillary force is utilized via the gas-liquid exchange part when adjusting the pressure in the ink tank. In a writing instrument in which a collector, which is an adjusting body for storing ink in a reservoir, is integrally formed, and the writing unit is held at the tip of the collector,
The writing instrument is characterized in that a seal portion with a cap is provided at the tip of the collector, and an air replacement hole leading to the ink tank is provided inside the seal portion.

In the present invention, the tip of the collector has a substantially double tubular shape with a gap between the inner cylindrical portion and the outer cylindrical portion, and the gap is an air replacement hole, and the inner cylindrical portion Inserts and holds the writing part in its tip, and supplies ink from the ink guiding part to the writing part,
It is preferable that a seal portion is formed on the outer surface of the distal end of the outer cylindrical portion.

  In the present invention, the air replacement hole formed in the front end portion of the collector is formed in a passage along the axial direction in which the front end opens toward the writing portion and the rear end opens toward the storage portion. It is suitable.

In the present invention, the collector is an integral structure having a generally tubular structure so that the internal hollow continues from the front end to the center and further to the rear end, and the collector is in the continuous internal hollow. The ink guide is inserted,
The collector with the ink guide portion inserted is fitted to the front part of the shaft cylinder that constitutes the outer periphery of the writing instrument, and the rear part of the shaft cylinder is fitted with ink inside the collector. Forming an ink tank to contain,
The front end of the ink guiding part is close to the rear part of the writing part and the rear end of the ink guiding part is located in the ink tank so that the ink in the ink tank is supplied to the writing part through the ink guiding part. ,
A storage part with a slit is formed on the outer periphery of the collector, and a gas-liquid exchange part is formed at the rear end of the collector so as to face the inside of the ink tank. When adjusting the pressure in the ink tank, the gas-liquid exchange part passes through the slit. It is preferable that the ink can be stored using the capillary force.

  In the present invention, it is preferable that the collector is made of a resin having an excellent water vapor barrier property.

According to the writing instrument of the present invention, the ink guiding portion is inserted in the length direction, and the collector is provided between the ink tank and the tip writing portion, and the gas-liquid exchanging portion is adjusted when adjusting the pressure in the ink tank. In a writing instrument in which a collector, which is an adjusting body for storing ink in a reservoir using the capillary force via, is integrally formed, and the writing unit is held at the tip of the collector, Since the seal part with the cap is provided and the air replacement hole leading to the ink tank is provided inside the seal part, the diameter of the seal part is made smaller compared to the case where the seal part is provided on the outer periphery of other parts such as a shaft cylinder. And the tightness of the seal portion can be ensured.
In addition, since the outer diameter of the seal part is small, the pressure change in the ink tank at the time of cap is also minute, and the pumping phenomenon is difficult to occur, so the cap is made in a double structure, the inner cap is movable, and the ink tank Since a method for suppressing changes in internal pressure is not employed, it is possible to reduce costs by reducing the number of parts. Further, since the sealing method is performed by fitting the seal portion at the tip of the collector and the cap, the ink volatilization suppressing effect is increased.

  In the present invention, the tip of the collector has a substantially double tubular shape with a gap between the inner cylindrical portion and the outer cylindrical portion, and the gap is an air replacement hole, and the inner cylindrical portion Inserts and holds the writing part in the tip, supplies ink from the ink guiding part to the writing part, and forms a seal part on the outer surface of the tip of the outer cylindrical part, thereby It is possible to prevent the ink guiding portion from being airtight and prevent drying, and when the cap is closed, the air in the cap does not flow, and the pumping action due to the increase in pressure in the ink tank can be reliably prevented.

  In the present invention, the air replacement hole formed in the front end portion of the collector is formed in a passage along the axial direction in which the front end opens toward the writing portion and the rear end opens toward the storage portion. Thus, in the integrally molded collector, the mold for the air replacement hole can be easily removed at the time of injection molding, and molding is easy.

  In the present invention, the collector is an integral structure having a generally tubular structure such that the internal hollow continues from the front end portion to the central portion and further to the rear end portion, and the collector is in the continuous internal hollow portion. An ink guiding part is inserted, the leading end of the ink guiding part is close to the rear part of the writing part, and the rear end of the ink guiding part is located in the ink tank, and the ink in the ink tank is written via the ink guiding part. By being configured to be supplied to the part, the hollow interior can be configured linearly, the structure can be simplified and the molding can be facilitated, and the ink guide part can reliably supply the ink in the ink tank to the writing part. Can be supplied to.

  In the present invention, the collector is made of a resin having excellent water vapor barrier properties (polypropylene (: PP), polybutylene terephthalate (: PBT)) to improve volatilization prevention, and the collector and the cap can be directly sealed. Ink volatilization can be prevented.

It is a whole explanatory view at the time of cap wearing of the writing instrument concerning a 1st embodiment of the present invention, (a) is a side view seen from one side, (b) is a side view seen from the other side, (c). Is a longitudinal sectional view. It is explanatory drawing of the cap provided in the said writing instrument, Comprising: (a) is a side view seen from one side, (b) is a side view seen from the other side, (c) is a longitudinal cross-sectional view, (d) is an external perspective view. FIG. It is a partial assembly figure of the state which mounted | worn the writing part and the ink guidance | induction part with the collector provided in the said writing instrument, (a) is a side view, (b) is a longitudinal cross-sectional view. It is explanatory drawing of the said collector single-piece | unit, Comprising: (a) is a side view, (b) is a longitudinal cross-sectional view, (c) is a rear end view, (d) is an external perspective view. It is explanatory drawing of the said collector single-piece | unit, Comprising: (a) is a rear view, (b) is a rear perspective view, (c) is a side view, (d) is a front perspective view, (e) is a front view. . It is explanatory drawing of the axial cylinder provided in the said writing instrument, Comprising: (a) is a side view, (b) is a longitudinal cross-sectional view. It is the whole explanatory view at the time of cap wearing of the writing instrument concerning a 2nd embodiment of the present invention, (a) is a side view seen from one side, (b) is a side view seen from the other side, (c). Is a longitudinal sectional view. It is explanatory drawing of the cap provided in the said writing instrument, Comprising: (a) is a side view seen from one side, (b) is a side view seen from the other side, (c) is a longitudinal cross-sectional view, (d) is an external perspective view. FIG. It is a partial assembly figure of the state which attached the writing part and the ink guide part to the collector provided in the writing instrument, (a) is a side view seen from one side, (b) is a side view seen from the other side, (c) ) Is a longitudinal sectional view. It is explanatory drawing of the said collector single-piece | unit, Comprising: (a) is a front perspective view, (b) is a front view, (c) is an external perspective view, (d) is a side view seen from one side, (e) is The side view seen from the other side, (f) is a longitudinal sectional view, (g) is an external perspective view, (h) is a rear end view, and (i) is a rear perspective view. It is explanatory drawing of the axial cylinder provided in the said writing instrument, Comprising: (a) is a side view, (b) is a longitudinal cross-sectional view.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1-6 is explanatory drawing of the writing instrument which concerns on the 1st Embodiment of this invention.

  FIG. 1 is an overall view of a writing instrument with a cap mounted thereon, FIG. 2 is an explanatory view of a cap provided on the writing instrument, FIG. 3 is a partial assembly diagram of a state where a writing section and an ink guiding section are mounted on a collector provided on the writing instrument, FIG. 5 is an explanatory view of the collector alone, and FIG. 6 is an explanatory view of a shaft cylinder provided in the writing instrument.

  As shown in FIG. 1, the writing instrument can send ink between an ink tank 10 that stores low-viscosity ink in a liquid state and a writing unit 12 provided at the tip of the writing instrument body from the ink tank 10. It has an ink guiding part 14 and a cap 18 that fits on the shaft tube 16 of the writing instrument body so as to cover the writing part 12 when not in use.

  In the writing instrument, an ink guiding part 14 is inserted in the lengthwise direction, and a collector 20 is provided between the ink tank 10 and the writing part 12 on the leading end side of the writing instrument, and the pressure in the ink tank 10 is adjusted. A collector 20 which is an adjusting body for storing ink in a reservoir 24 utilizing capillary force via a gas-liquid exchanging unit 22 is integrally formed, and the writing unit 12 has a tip of the collector 20. Held in the department.

  The writing instrument is provided with a seal portion 26 with the cap 18 on the outer periphery of the tip of the collector 20 and an air replacement hole 28 leading to the ink tank 10 inside the seal portion 26.

  Specifically, as shown in FIGS. 3 to 5, the tip of the collector 20 has a substantially double tubular shape configured with a gap between the inner cylindrical portion 30a and the outer cylindrical portion 30b. Each of the inner cylindrical portion 30a and the outer cylindrical portion 30b has a substantially tubular shape, and a plurality of ribs 34 are formed between them (in the embodiment, at intervals of 90 degrees in the circumferential direction), and the inner cylindrical portion 30a and the outer cylindrical portion 30b The rear end portions of the cylindrical portion 30b are connected by a flange-shaped portion 36 so that the interval between the inner cylindrical portion 30a and the outer cylindrical portion 30b does not change. The air replacement hole 28 penetrates the flange-like portion 36 from between the ribs 34, 34. In the present embodiment, four ribs 34 are formed, and one air replacement hole 28 and three front end openings 29 are formed. In addition, although the air replacement hole 28 is one place in this embodiment, multiple pieces may be formed.

  Further, the inner cylindrical portion 30a inserts and holds the writing portion 12 in the tip thereof, and supplies the ink to the writing portion 12 via the ink guiding portion 14, and the tip of the outer cylindrical portion 30b. The seal portion 26 is formed on the outer surface. The seal portion 26 has a cylindrical shape and an outer surface having a flat cylindrical shape.

  As shown in FIG. 2, the cap 18 has an outer cylindrical portion 18a and an inner cylindrical portion 18b formed in the cap 18 that are opened rearward in parallel to the axis. The inner cylinder part 18b is shorter than the outer cylinder part 18a, and the cap 18 side seal part 40 is formed at the rear end. The cap 18 side seal portion 40 has a convex portion continuously formed in an annular shape on the inner peripheral surface, and the cap 18 side seal portion 40 is in sliding contact with the seal portion 26 to keep the writing portion 12 airtight. Further, a plurality of protrusions 42 are formed on the inner side of the rear end portion of the outer cylinder portion 18a of the cap 18, and are engaged with and fixed to the irregularities 16a on the outer periphery of the shaft cylinder 16.

  The collector 20 is buried and fitted into the shaft tube 16 and is fixed by being buried up to the middle of the outer cylindrical portion 30b where the air replacement hole 28 is formed. In this case, the annular concave portion (concave / convex) 30b1 on the outer surface of the outer cylindrical portion 30b is fitted to the annular convex portion (concave / convex) 16b in the shaft tube 16, and has an outer diameter larger than the outer diameter of the inner diameter portion 16c and the outer cylindrical portion 30b. Since the undercut 30b2 is press-fitted, leakage of a liquid such as ink or a gas such as water vapor is prevented while maintaining airtightness.

  In addition, with the cap 18 covering the writing portion 12, the cap 18 side seal portion 40 of the inner cylinder portion 18 b is fitted to the seal portion 26 of the collector 20, and the cap 18 has a rear end inner peripheral surface portion. The projection 42 is configured to be fitted to the irregularities 16a on the outer periphery of the shaft tube 16 to prevent the cap 18 from coming off from the shaft tube 16, and since the airtight and the fixing fitting portion are separately formed, Each design has a high degree of freedom.

  In FIG. 1 and FIG. 2, reference numeral 18c denotes a clip for fixing the writing instrument by holding it in a pocket of clothes.

  As shown in FIGS. 3 to 5, the air replacement hole 28 formed in the front end portion of the collector 20 has a front end that opens toward the writing portion 12 and a rear end that opens toward the storage portion 24. It is formed in a passage along the axial direction.

  Further, the collector 20 is an integral structure having a substantially tubular structure so that the internal hollow 32 is continuous from the front end portion to the center portion and further to the rear end portion, and the collector 20 is formed in the continuous internal hollow 32. The ink guiding part 14 is inserted.

  The ink guiding portion 14 can be made of various materials such as a porous body molded article and a guiding core.

  The collector 20 in a state where the ink guiding portion 14 is inserted is fitted to the front portion in the shaft tube 16 constituting the outer periphery of the writing instrument, and the rear portion of the shaft tube 16 is located behind the fitting portion of the collector 20. An ink tank 10 for containing ink is formed inside.

  The front end of the ink guiding part 14 is close to the rear part of the writing part 12 and the rear end of the ink guiding part 14 is located in the ink tank 10, and the ink in the ink tank 10 passes through the ink guiding part 14. 12 is supplied.

  The writing unit 12 has a configuration of a water-based ballpoint pen in which a tip is fitted to the inner cylindrical portion 30a, a ball is provided at the tip of the tip, and ink is supplied to the ball by the ink guiding portion 14 being close to the ball. ing. In this case, the ink guiding unit 14 is close enough to supply ink to the ball so that the ink guiding unit 14 does not interfere with the rotation of the ball by contacting the ball of the writing unit 12 (not depriving the smoothness of writing). It is in a state (approaching and non-contact state). The writing unit 12 may be a felt pen, a marking pen, or the like that is integrated with the ink guiding unit 14 and has a structure in which the front end of the forming core protrudes.

  In the collector 20, an air replacement hole 28 is opened in a flange-like portion 36 provided at the rear end of the outer cylindrical portion 30 b. A retaining portion 24 having a slit 44 is formed on the outer peripheral surface portion of the collector 20 behind the flange-shaped portion 36. In the reservoir 24, a large number of plate portions are provided in a accordion shape in the radial direction, and a reservoir 24 is formed in which the interval becomes narrower and the capillary force becomes higher toward the rear. Each gap is connected by a slit 44 in the vertical direction.

  A gas-liquid exchanging part 22 is formed at the rear end of the collector 20 so as to face the inside of the ink tank 10, and the reservoir 24 is passed through the slit 44 from the gas-liquid exchanging part 22 when adjusting the pressure in the ink tank 10. Ink can be stored using capillary force. The gas-liquid exchange part 22 is formed in a recess at the rear end part of the collector 20, and the slit 44 is continuous.

  The material of the collector is preferably a resin excellent in water vapor barrier properties (for example, polypropylene (: PP), polybutylene terephthalate (: PBT)).

  According to the writing instrument of the embodiment, the ink guide portion 14 is inserted in the length direction, and the collector 20 is provided between the ink tank 10 and the writing portion 12 on the tip side, and the pressure in the ink tank 10 is A collector 20 which is an adjusting body for storing ink is integrally formed by a reservoir 24 using capillary force via a gas-liquid exchange part 22 at the time of adjustment, and the writing part 12 is a tip part of the collector 20. In the writing instrument held in the container, the seal portion 26 with the cap 18 is provided at the tip of the collector 20, and the air replacement hole 28 leading to the ink tank 10 is provided inside the seal portion 26. The diameter of the seal portion 26 can be reduced compared to the case where the seal portion 26 is provided, and the tightness of the seal portion 26 can be ensured.

  Further, since the outer diameter of the seal portion 26 is small, the pressure change in the ink tank 10 when the cap 18 is fitted becomes minute, and the pumping phenomenon is hardly generated. In addition, since there is no need to adopt a method of suppressing the pressure change in the ink tank 10 by moving the inner cap 18 with a double structure, the number of parts can be reduced and the cost can be reduced. can do.

  Further, since the sealing method is performed by fitting the seal portion 26 at the tip of the collector and the cap-side seal portion 40, the ink volatilization suppressing effect is increased.

  In the writing instrument, the tip of the collector 20 has a substantially double tubular shape with a gap between the inner cylindrical portion and the outer cylindrical portion, and the gap is the air replacement hole 28, and the inner cylindrical shape. The part inserts and holds the writing part 12 in the tip, supplies ink from the ink guide part 14 to the writing part 12, and forms a seal part 26 on the tip outer surface of the outer cylindrical part, The ink guiding portion 14 in the inner cylindrical portion is surely airtight to prevent drying, and when the cap 18 is closed, the air in the cap 18 does not flow, and the pumping action due to the increase in pressure in the ink tank 10 is ensured. Can be prevented.

  In the writing instrument, a passage along an axial direction in which the air replacement hole 28 formed in the front end portion of the collector 20 is opened toward the front of the writing portion 12 and the rear end is opened toward the storage portion 24. Thus, the mold of the air replacement hole 28 can be easily removed at the time of injection molding in the integrally molded collector 20, and molding is easy.

  In the writing instrument, the collector 20 has an integral structure having a substantially tubular structure so that the internal hollow 32 is continuous from the front end portion to the center portion and further to the rear end portion. The ink guide part 14 is inserted into the ink tank 10, the tip of the ink guide part 14 is close to the rear part of the writing part 12, and the rear end of the ink guide part 14 is located in the ink tank 10. By configuring the ink to be supplied to the writing unit 12 via the ink guiding unit 14, the internal hollow 32 can be configured linearly, the structure can be simplified, and the molding can be facilitated. The unit 14 can reliably supply the ink in the ink tank 10 to the writing unit 12.

  Further, the material of the collector 20 is made of resin (PP, PBT) having an excellent water vapor barrier property, so that the volatilization prevention property is enhanced, and even if the collector 20 and the cap 18 are directly sealed, the volatilization of the ink can be prevented.

7-12 is explanatory drawing of the writing instrument which concerns on the 2nd Embodiment of this invention.
FIG. 7 is an overall view of the writing instrument with the cap attached, FIG. 8 is an explanatory view of the cap provided on the writing instrument, FIG. 9 is a partial assembly view of the collector provided on the writing instrument with the writing part and the ink guiding part attached, FIG. Is an explanatory view of the collector alone, and FIG. 11 is an explanatory view of a shaft cylinder provided in the writing instrument.
The difference from the first embodiment is that the inner rib 11 is formed in the shaft tube 16, the space 50 is formed in front of the cap 18, and the volume in the inner tube portion 18b is reduced, and the seal portion of the collector 20 26 is formed in a tapered shape, and the sealing method with the cap 18 is different.
The inner rib 11 is formed by forming a plurality of ribs along the axial direction on the inner wall surface of the ink tank 10 of the ink containing portion inside the rear portion of the shaft cylinder 16. The space portion 50 of the cap 18 is formed by retracting a portion of the inner cylindrical portion 18b that forms a lid shape backward from the distal end portion of the cap 18, thereby forming an inner space at a location where the distal end portion of the cap 18 is cylindrical. It is. Since the space 50 is formed and the space covering the tip of the writing part 12 by the inner cylinder part 18b can be minimized, ink drying from the writing part 12 can be minimized.
Further, the seal portion 26 of the collector 20 is formed in a tapered shape so that the seal portion 26 is hermetically sealed with the seal portion 40 of the inner cylinder portion 18b. On the other hand, when the cap 18 is fixed, the inner protrusion 42 is connected to the shaft tube 10. Since this is performed by fitting to the outer circumferential irregularity portion 16a, the airtightness and the fixing fitting portion are separately formed, and the degree of freedom in designing each is high.
Since the configuration and effects other than those described above are the same as those in the first embodiment, a description thereof will be omitted.

  The writing instrument of the present invention can be used for writing instruments such as a ballpoint pen and a marker pen.

DESCRIPTION OF SYMBOLS 10 Ink tank 11 Inner rib 12 Writing part 14 Ink guide part 16 Shaft cylinder 16a Irregular part 16b Annular convex part 16c Inner diameter part 18 Cap 18a Outer cylinder part 18b Inner cylinder part 20 Collector 22 Gas-liquid exchange part 24 Reservoir part 26 Seal part 28 Air replacement hole 29 Front end opening 30a Inner cylindrical portion 30b Outer cylindrical portion 30b1 Annular recess 30b2 Undercut 32 Internal hollow 34 Rib 36 Flange-shaped portion 40 Cap side seal portion 42 Cap projection 44 Slit 50 Space portion

Claims (5)

An ink tank that stores low-viscosity ink in a liquid state inside, an ink guiding section that can send ink between the ink tank and the writing section, and a shaft cylinder that covers the writing section when not in use And a cap to
An ink guiding part is inserted in the length direction and provided between the ink tank and the writing part. When adjusting the pressure in the ink tank, the ink is stored in the reservoir part using the capillary force via the gas-liquid exchange part. In the writing instrument in which the writing part is held at the tip of the collector, the collector being an adjustment body to be stored,
A writing instrument, wherein a seal portion with a cap is provided at a tip of a collector, and an air replacement hole leading to an ink tank is provided inside the seal portion. The tip of the collector has a substantially double tubular shape with a gap between the inner cylindrical portion and the outer cylindrical portion, and the gap is an air replacement hole, and the inner cylindrical portion is in the tip. Insert and hold the writing part, and supply ink from the ink guiding part to the writing part,
The writing instrument according to claim 1, wherein a seal portion is formed on the outer surface of the distal end of the outer cylindrical portion.   The air replacement hole formed in the front end portion of the collector is formed in a passage along the axial direction in which the front end opens toward the writing portion and the rear end opens on the storage portion side. The writing instrument according to claim 2. The collector is an integral structure having a generally tubular structure so that the inner hollow continues from the front end to the center and further to the rear end, and the ink guiding portion is inserted into the continuous inner hollow. And
The collector with the ink guide portion inserted is fitted to the front part of the shaft cylinder that constitutes the outer periphery of the writing instrument, and the rear part of the shaft cylinder is fitted with ink inside the collector. Forming an ink tank to contain,
The front end of the ink guiding part is close to the rear part of the writing part and the rear end of the ink guiding part is located in the ink tank so that the ink in the ink tank is supplied to the writing part through the ink guiding part. ,
A storage part with a slit is formed on the outer periphery of the collector, and a gas-liquid exchange part is formed at the rear end of the collector so as to face the inside of the ink tank. When adjusting the pressure in the ink tank, the gas-liquid exchange part passes through the slit. 4. The writing instrument according to claim 1, wherein the ink can be stored using capillary force.   5. The writing instrument according to claim 1, wherein the collector is made of a resin having an excellent water vapor barrier property.

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