JP2015217519A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument of a simple mechanism capable of providing calligraphy dark in a drawing line, while avoiding a much drop in use.SOLUTION: A writing instrument is formed of a storage part 16 for storing ink in a barrel 14 by allowing a cap 10 to attach-detach a writing part 12 on the tip of the barrel 14 and a temporary storage part 18 composed of an elastically deformable ink storage body capable of temporarily storing the ink, then when installing the cap 10 on the tip of the barrel 14, the temporary storage part 18 is compressively deformed, while, when removing the cap 10 from the tip of the barrel 14, the temporary storage part 18 is expansively deformed by its removal operation, the temporary storage part 18 becomes negative pressure, the ink in the storage part 16 is filled in the temporary storage part 18 by the negative pressure, and the ink can be supplied to the writing part 12 from this temporary storage part 18.

Description

  The present invention relates to a writing instrument for applying ink to an object.

  Conventionally, marking pens that use a cotton pad in the ink tank to reduce the direct current phenomenon (excessive dropping) of ink that is unintentionally used during use have a low writing flow, thin lines, and quality. It is difficult to obtain a handwriting, and an example of the writing instrument is referred to Japanese Patent Laid-Open No. 2000-52682 (Patent Document 1).

  On the other hand, there is a direct liquid mechanism for increasing the writing flow rate. When the ink tank internal pressure rises, there is a problem that dripping occurs at the time of pumping (see, for example, JP-A-9-58175 (Patent Document 2)). In addition, there was an effort to pump.

  Furthermore, although a writing instrument is disclosed that pressurizes from the rear end of the writing unit to increase the flow rate as appropriate, pressurization is required for each writing (see, for example, Japanese Utility Model Publication No. 5-49074 (Patent Document 3)).

  For this reason, it is difficult to obtain a handwriting with a dark drawn line while avoiding dripping and making a simple mechanism.

JP 2000-52682 A JP-A-9-58175 Japanese Utility Model Publication No. 5-49074

  In view of the above circumstances, the present invention provides a writing instrument having a simple mechanism capable of obtaining a handwriting with a dark drawn line while avoiding dripping.

The present invention is a writing instrument in which the cap can be attached to and detached from the tip of the shaft tube,
The shaft tube is formed with a storage unit that directly stores ink, and a temporary storage unit that is formed of an ink storage body that can temporarily store ink and can be elastically deformed.
When the cap is attached to the tip of the barrel, the temporary storage portion is compressed and deformed,
On the other hand, when the cap is removed from the tip of the shaft tube, the temporary storage portion is inflated and deformed by the removal operation, and the temporary storage portion becomes negative pressure, and the ink in the storage portion is transferred to the temporary storage portion and the writing by the negative pressure. The writing instrument is characterized in that it can be written by being filled in the part.

In the present invention, at the tip of the shaft tube, a tip shaft portion that exposes the writing portion toward the front is urged forward by a spring so as to be movable forward and backward, and
The tip shaft portion that houses the temporary storage portion is slidably connected to the shaft tube,
When the cap is attached to the tip of the shaft cylinder, the front shaft portion is pushed backward at the protrusion inside the cap, and the temporary storage portion in the joint portion is compressed and deformed by the front shaft portion and the joint portion,
On the other hand, when the cap is removed, the protrusion inside the cap moves away from the front shaft portion, so that the front shaft portion moves forward by the biasing force of the spring so that the temporary storage portion is inflated and deformed. It is suitable.
In the present invention, the cap can be pushed backward to cover the writing part protruding from the tip part and keep the writing part airtight.

  In the present invention, the writing unit is set to have a higher capillary force than the temporary storage unit.

  According to the writing instrument of the present invention, when the cap is attached to the tip of the shaft tube, the temporary storage portion is compressed and deformed. On the other hand, when the cap is removed from the tip of the shaft tube, the temporary storage portion is expanded by the removing operation. Since the temporary storage unit is deformed to have a negative pressure, and the ink in the storage unit is filled in the temporary storage unit and the writing unit with the negative pressure, the temporary storage unit is changed from the storage unit by opening the cap. In addition, a mechanism for transferring the ink to the writing portion can be provided, and the writing flow rate can be increased as compared with that filled in the filling, and the flow rate curve can be stabilized.

  In addition, no pumping is required at the time of writing, and there is no ink dripping.

  Therefore, according to the present invention, it is possible to provide a writing instrument with a simple mechanism and capable of obtaining a handwriting with a dark drawn line while avoiding dripping during pumping.

BRIEF DESCRIPTION OF THE DRAWINGS It is a writing instrument which concerns on embodiment of this invention, Comprising: The explanatory drawing of the state with which the cap was mounted | worn completely is shown, (a) is an external view, (b) is a whole longitudinal cross-sectional view, (c) is a writing part. It is a detailed vertical sectional view of the vicinity. FIG. 1 is an explanatory view of the writing instrument of FIG. 1 in a state where the cap has been removed, (a) is an external view, (b) is an overall longitudinal sectional view, and (c) is a detailed longitudinal sectional view near the writing portion. is there. FIG. 1 is an explanatory view of the writing instrument of FIG. 1 after the cap is removed, (a) is an external view, (b) is an overall longitudinal sectional view, and (c) is a detailed longitudinal sectional view in the vicinity of the writing portion. It is. 1A and 1B are explanatory views (caps are not shown) of a writing part and a tip shaft part when a cap is mounted on the writing instrument of FIG. 1, wherein FIG. 1A is a side view and FIG. 1B is a perspective view from the front. . The explanatory drawing of the state of a writing part and a front-axis | shaft part when a cap is removed is shown with the writing instrument of FIG. 1, (a) is a side view, (b) is a perspective view from the front. FIG. 1 shows a part diagram of a shaft cylinder of the writing instrument in FIG. 1, (a) is a view from the front, (b) is a perspective view from the front, (c) is a front view, (d) is a longitudinal sectional view, (e) ) Is a rear view. 1 is a component diagram of the front shaft portion of the writing instrument in FIG. 1, (a) is a perspective view from the front, (b) is a view from the front, (c) is a front view, (d) is a longitudinal sectional view, ( e) is a rear perspective view, and (f) is a rear view. 1 is a component diagram of a joint portion of the writing instrument of FIG. 1, (a) is a perspective view from the front, (b) is a view from the front, (c) is a front view, (d) is a longitudinal sectional view, (e) ) Is a rear perspective view, and (f) is a rear view. FIG. 2 shows a part view of the spring holder of the writing instrument in FIG. 1, (a) is a perspective view from the front, (b) is a view from the front, (c) is a plan view, and (d) is a longitudinal section of (c). (E) is a front view, (f) is a longitudinal sectional view of (e), (g) is a perspective view from the rear, and (h) is a rear view.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, the front end and the front indicate the writing part side, and the rear end and the rear indicate the side opposite to the writing part side.

  This invention can be set as the structure of the writing instrument of embodiment shown in FIGS.

  1 to 3 show a progress state when the cap 10 is removed, FIG. 4 shows a state in which the cap is attached, and the writing unit 12 is pushed into the shaft cylinder 14 (the cap 10 is not shown). Reference numeral 5 denotes a state in which the writing unit 12 protrudes from the tip of the shaft tube 14. 6 to 9 are explanatory diagrams of each component.

  In the writing instrument according to the embodiment of the present invention, the cap 10 is detachable from the tip of the shaft tube 14 provided with the writing unit 12.

  In the writing instrument according to the embodiment shown in FIG. 1, a state in which the cap 10 is not removed and the shaft 14 is fitted is shown. In this case, the temporary storage part 18 is sandwiched between the front shaft part 20 and the joint part 22 and is compressed, and the volume is the smallest. In a state where the cap 10 is not shown, the writing portion 12 and the tip shaft portion 20 are retracted inside the tip of the shaft tube 14 as shown in FIG.

  Thereafter, when the cap 10 is started to be removed, as shown in FIG. 2, the pressing of the projection 28c provided at the rear end of the crown 10 of the cap 10 is gradually released, and the writing unit 12 follows the projection 28c. And the front shaft part 20 moves to the front end by the elastic force of the spring 24. At this time, since the protrusion 28c is in close contact with the writing portion 12 and the tip of the front shaft portion 20, the gap between the writing portion 12 and the front shaft portion 20 is closed by the protrusion 28c. Air replacement with outside air is regulated.

  Thereby, the space | interval of the front-axis | shaft part 20 and the coupling part 22 opens rather than the state of FIG. 1, and the temporary storage part 18 expand | swells. As described above, since air replacement is restricted by the protrusion 28 c, a negative pressure is generated in the temporary storage portion 18 by the expansion, and the negative pressure passes through the communication path in the joint portion 22, and the storage portion 16. As a result, ink is sucked up from the storage portion 16 through the joint portion 22 and stored in the temporary storage portion 18 and the writing portion 12. In this case, the writing unit 12 is set to have a higher capillary force than the temporary storage unit 18.

  Further, when the cap 10 is completely removed, writing can be performed in a state where the writing portion 12 and the tip shaft portion 20 are moved to the front end by the elastic force of the spring 24 as shown in FIGS. At this time, since the cap 10 is not removed and air replacement is not restricted by the protrusion 28c and the seal rubber 28d, the gap between the writing portion 12 and the tip shaft portion 20 (inside the tip side of the tip shaft portion 20). Air is displaced through a groove 20g) formed in the circumference.

Accordingly, it is possible to provide a writing instrument having a simple mechanism and avoiding a drop-off at the time of pumping, and having a simple mechanism.
In addition, since the ink transfer mechanism is provided, the writing flow rate can be increased as compared with the case where the padding is filled, and the flow rate curve can be stabilized.
Further, since the writing unit 12 does not need to be pumped when the cap 10 is removed, there is no ink dripping (intentional dripping of ink).

  Specifically, each part has the following structure.

  The writing part 12 is exposed to be writable so that the writing part 12 is attached to the front shaft part 20 and fixed. The writing unit 12 has a capillary force and can have various configurations such as a resin fiber bundle, a continuous porous body, and a pen core in which an ink guide groove is formed. The material of the writing part 12 is natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, poly Ether resins and polyphenylene resins can be used.

  As shown in FIG. 6, the shaft tube 14 is sealed at its rear end with a tail plug 14 a and includes a storage unit 16 for storing ink. The storage unit 16 is directly filled with ink.

The ink stored in the storage unit 16 has titanium oxide and / or an organic pigment as a raw material, an anionic or nonionic surfactant as a dispersant, and also has adhesion to an ink non-penetrating surface. The water-soluble resin, if necessary, using additives such as preservatives, dissolution aids, auxiliary solvents, etc., and mixing these predetermined amounts with water, such as ball mill, sand mill, colloid mill, atrider, dyno mill, etc. It is adjusted by mixing and dispersing with a disperser.
The viscosity of the ink is desirably in the range of 3 to 100 mPa · s at a temperature of 25 ° C. in order to obtain a sufficient ink outflow amount when writing on a writing material such as paper or glass, and more preferably, An aqueous pigment ink having a range of 10 to 50 mPa · s is desirable.
Moreover, it is desirable to store at least one stirring member (not shown) in the storage unit 16.

The shaft cylinder 14 has a structure in which the inner surface of the rear end is slightly enlarged and is detachably provided by the tail plug 14a. Further, the central portion in the axial direction is an inner surface having the same diameter from the mounting portion of the tail plug 14a to the rear end of the stepped portion 14b at the position where the joint portion 22 is arranged. In addition, the tip (front shaft portion 20 storage portion) has a small diameter from the stepped portion 14b on the inner surface of the shaft tube 14, and the large-diameter rear portion of the joint portion 22 is locked and positioned at the stepped portion 14b. The tip portion of the joint portion 22 having a small diameter is arranged ahead of the stepped portion 14b.
A tip shaft portion 20 with the writing portion 12 exposed to the front can be disposed at the tip of the shaft tube 14, and the tip shaft portion 20 is provided with a joint portion 24 and a spring support via the valve rod 26 and the writing portion 12. It is urged forward by a spring 24 surrounded by 30 and is arranged so as to be able to move forward and backward within the tip of the shaft tube 14.

  A temporary storage portion 18 is loaded on the tip shaft portion 20 attached to the tip of the shaft cylinder 14, and the ink storage body of the temporary storage portion 18 has a configuration of a fiber bundle and a continuous porous body, and is elastically deformed. Is possible. As a material of the temporary storage unit 18, natural fiber, synthetic resin fiber, urethane, or the like can be used.

As shown in FIG. 7, the front shaft portion 20 is formed with a narrow-diameter portion 20a on the front side and a cylindrical portion 20b which is behind the thin-diameter portion 20a and whose outer periphery is larger in diameter than the small-diameter portion 20a. Yes. In addition, the joint portion 22 is housed in the rear portion, and moves forward and backward with respect to the shaft tube 14. A flange 20f is formed on the outer periphery of the rear end in the axial direction.
The outer peripheral surface of the flange 20f is disposed so as to be slidable in close contact with the inner peripheral surface of the front side (the front shaft portion 20 and the joint portion 22 storage portion) from the stepped portion 14b on the inner surface of the shaft tube 14.
The front end portion of the front shaft portion 20 is attached with the writing portion 12, is formed to have a smaller diameter than the rear of the front shaft portion 20, and a plurality of air replacement grooves 20g are formed on the inner periphery. The inner surface portion excluding the air replacement groove 20g is press-fitted with the writing portion 12.

  The inner cylindrical portion of the cylindrical portion 20b of the front shaft portion 20 is inserted into the front portion 22a of the joint portion 22 so as to be able to move back and forth, and is fixed to the joint portion 22 of the front shaft portion 20 (fixed to the shaft tube 14). The temporary storage portion 18 contracts and expands due to the relative movement to the rear and front with respect to). The temporary storage unit 18 becomes positive pressure / negative pressure due to the contraction / expansion of the temporary storage unit 18, and the ink in the storage unit 16 is transferred to the temporary storage unit 18 and the writing unit 12 through the joint portion 22 when the pressure is negative. It has a moving structure. A groove 22e is formed on the outer periphery of the tip 22a, and a seal 22d is fitted in the groove 22e. The seal 22d can be made of a rubber or elastomeric elastic material such as an O-ring.

  As shown in FIG. 8, the joint portion 22 has a front portion 22 a having a small diameter and a rear portion 22 g having a large diameter. A narrow tip portion 22a of the joint portion 22 is formed in a piston shape, and a groove 22e is formed in the outer peripheral portion of the tip for fitting the seal 22d. The seal 22d keeps the air tightness and liquid tightness between the inner periphery of the front shaft 20 and the outer periphery of the joint 22. Further, the communication passage 22b and the opening 22h inside the narrow-diameter front portion 22a serve as an insertion portion for the valve rod 26.

  As shown in FIG. 1 to FIG. 3, when the front shaft portion 20 moves forward from the joint portion 22 when the front shaft portion 20 moves forward and backward in the rear portion of the front shaft portion 20, The space in the rear part expands and the temporary storage part 18 expands. At this time, the shaft cylinder 14 and the joint portion 22 are liquid-tight, and the seal 22d is liquid-tight to prevent leakage, so that the space surely has a negative pressure. The ink in 16 can be reliably guided to the temporary storage 18 and the writing unit 12 via the joint 22.

The tip of the joint portion 22 is a portion that presses the temporary storage portion 18. In addition to the configuration in which the opening 22h at the tip is narrowed, the valve stem 26 is inserted into the opening 22h. Therefore, it is possible to adjust the ink to be gradually guided toward the writing unit 12 by preventing the ink from being suddenly blown out.
Further, the rear portion 22g of the joint portion 22 is formed to have an outer diameter that engages with the inside of the shaft tube 14.

  A spring receiver 30 is fitted to the rear portion 22 f of the joint portion 22, and a spring 24 is in contact with and locked to the inner surface of the spring receiver 30, and the spring 24 passes through the valve rod 26 and the writing portion 12. The shaft portion 20 is urged forward.

  As shown in FIG. 9, the spring receiver 30 has a body portion 30a press-fitted to the joint portion 22 in the front, a spring receiver 30b in which the spring 24 abuts inside the body portion 30a, and the storage portion 16 to the inside of the joint portion 22. A flow groove 30c for communicating ink is formed.

  The cap 10 is combined with a cylindrical fitting portion 10 a that fits around the shaft tube 14, a crown 28 that fits inside the tip of the fitting portion 10 a, and a seal rubber 28 d that prevents ink volatilization of the writing portion 12. It has been done. The fitting portion 10a is formed with irregularities that fit into the irregularities on the peripheral surface of the shaft tube 14 (not shown).

Further, when the cap 10 is attached to the tip end portion of the shaft tube 14, a cylindrical fitting portion is fitted around the shaft tube 14 to seal (capture volatilization) between the cap 10 and the shaft tube 14. Therefore, the writing unit 12 does not cause ink evaporation.
Further, when the ink in the storage unit 16 decreases with ink consumption during normal writing, external air is taken into the storage unit 16 from the groove 20g formed on the inner peripheral surface of the tip end portion 20 and stored. The ink in the part 16 is accumulated in the temporary storage part 18 through the outer periphery of the valve rod 26, and the ink can be supplied to the writing part 12.

  The cap 10, the crown 28, the seal rubber 28d, the shaft tube 14, the tip shaft portion 20, the joint portion 22, the valve stem 26, the tail plug 14a, and the like can be resin-molded using various resin materials.

  The above embodiment is a preferred example of the present invention, but can be variously modified within the scope of the present invention.

  The writing instrument of the present invention is suitable for a valve-type writing instrument in which a low-viscosity ink is directly filled in a shaft cylinder, and can also be used as a board marker using an ink having a high vapor pressure or an applicator for hair dyeing applications. .

DESCRIPTION OF SYMBOLS 10 Cap 10a Insertion part 12 Writing part 14 Shaft cylinder 14a Tail plug 16 Storage part 18 Temporary storage part 20 Front shaft part 22 Joint part 24 Spring 26 Valve rod 28 Crown 28c Projection part 28d Seal rubber 30 Spring support

Claims (3)

In a writing instrument in which the cap can attach and detach the writing part to the tip of the shaft,
The shaft tube is formed with a storage unit that directly stores ink, and a temporary storage unit that is formed of an ink storage body that can temporarily store ink and can be elastically deformed.
When the cap is attached to the tip of the barrel, the temporary storage portion is compressed and deformed,
On the other hand, when the cap is removed from the tip of the shaft tube, the temporary storage portion is inflated and deformed by the removal operation, and the temporary storage portion becomes negative pressure, and the ink in the storage portion is transferred to the temporary storage portion and the writing by the negative pressure. Writing instrument characterized by being filled in the part and capable of writing. At the tip of the shaft tube, a tip shaft portion with the writing portion exposed forward is urged forward by a spring so as to be movable forward and backward, and
The tip shaft portion that houses the temporary storage portion is slidably connected to the shaft tube,
When the cap is attached to the tip of the shaft cylinder, the front shaft portion is pushed backward at the protrusion inside the cap, and the temporary storage portion in the joint portion is compressed and deformed by the front shaft portion and the joint portion,
On the other hand, when the cap is removed, the protrusion inside the cap moves away from the front shaft portion, so that the front shaft portion moves forward by the biasing force of the spring so that the temporary storage portion is inflated and deformed. The writing instrument according to claim 1, wherein:   The writing instrument according to claim 1 or 2, wherein the writing unit is set to have a higher capillary force than the temporary storage unit.

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