JP3942273B2 - Writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument provided with two or two types of pen tips or writing tips at both ends.
[0002]
[Prior art]
Conventionally, a writing instrument (hereinafter referred to as an “oil-based sign pen”) using a volatile organic solvent such as alcohol as the main solvent is sealed and sealed with a cap or tail plug so that the ink contained in the shaft body does not volatilize. However, due to the nature of the solvent, the solvent evaporates little by little, and the vapor permeates through the shaft body and volatilizes.
For this reason, for example, in the double-headed oil-based sign pen described in Japanese Utility Model Publication No. 58-15197, during long-term storage, the ink occlusion body in a single shaft cylinder and the ink occlusion body in a double shaft cylinder are shafts. There was a difference in the amount of volatile organic solvent that permeated through the tube, and in the drawings of the publication, there was a case where a significant difference in writing life was produced between the pen core (2) side and the pen core (6) side.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a writing instrument that suppresses the volatilization amount of the solvent and balances the writing life of the front writing instrument and the rear writing instrument.
[0004]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the above-mentioned conventional problems can be solved by providing perforations in the inner cylinder shaft of the writing instrument, and the present invention has been completed. It was.
[0005]
That is, the double-headed writing instrument of the present invention has an ink occlusion body in which a pen core is inserted from the front end of an outer cylinder shaft formed of a resin that transmits a solvent, and an ink made of a solvent that transmits the resin is filled in the rear end of the pen core A front writing instrument configured to have a required space behind the ink occlusion body in the outer cylinder shaft, and a pen core from the inner cylinder shaft head end, and the pen core at the rear end of the pen core. An ink storage body filled with ink of the same type of solvent as the ink in the ink storage body is connected, and the inner cylinder shaft head is connected to the inner cylinder shaft so as to seal the ink storage body, and the rear end of the inner cylinder shaft is connected. A rear writing instrument configured to perform a tail plug at the rear end of the ink occlusion body at the end, and the inner cylinder shaft of the rear writing instrument is inserted into the rear of the ink occlusion body in the outer cylinder shaft of the front writing instrument described above, The inner tube shaft can plug the ink occlusion body of the front writing instrument. In urchin configuration the writing instrument, the inner cylinder axis in the cylinder axis side among away from the inner cylindrical shaft bottom and the outer cylinder shaft, characterized in that a perforation communicating.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a front writing instrument A and a rear writing instrument B according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a state where one writing instrument is formed by inserting the tail end of the rear writing instrument B shown in FIG. 1 into the inner side from the tail end of the front writing instrument A. FIG. 3 is a longitudinal sectional view and a transverse sectional view of the inner cylinder shaft in the outer cylinder shaft.
[0007]
The double-headed writing instrument C of the present invention includes the front writing instrument A and the rear writing instrument B shown in FIG. 1, and the tail end of the rear writing instrument B is inserted into the inside from the tail end of the front writing instrument A. FIG. It is comprised as one writing instrument shown in.
In the front writing instrument A, a pen core 2 is forcibly inserted through a holder 2a into the tip of an outer cylinder shaft 1 formed of a resin that is permeable to a solvent, and the outer cylinder shaft is inserted into the rear end of the pen core 2 in the outer cylinder shaft 1. 1 is a configuration in which a cap 4 is provided so that an ink occlusion body 3 filled with an ink containing a solvent that permeates the resin accommodated in the inner side from the rear end is coupled and the pen core 2 is sealed.
[0008]
On the other hand, the rear writing instrument B is, for example, inserted into the tip of the inner cylinder shaft head 5 side formed of polyethylene, polypropylene or the like via a holder 6a, and is inserted into the rear end of the pen core 6 in the inner cylinder shaft head 5. The ink storage 7 filled with ink containing the same type of solvent as the ink in the ink storage 3 is combined, and the inner cylinder is sealed so that the ink storage 7 protruding rearward from the inner cylinder head 5 is sealed. A perforation 11 in which the inside of the inner cylinder shaft and the inside of the outer cylinder shaft shown in FIG. 3 communicate with the cylinder portion 5a of the shaft head 5 from the inner cylinder shaft 8 and the outer cylinder shaft fitting portion 12 to the rear end side of the inner cylinder shaft 7. The inner cylinder shaft 8 provided with at least one is fitted, and the inner surface of the rear end of the inner cylinder shaft 8 serves to fix and tail the ink occlusion body 7 and caps the pen core 6 so as to be sealed. 9 is provided.
[0009]
Further, a space portion 10 having a required length is provided behind the ink occlusion body 3 in the outer shaft cylinder 1 of the front writing instrument A, and the inner cylinder shaft 8 of the rear writing instrument B is fitted into the space section 10 so that the rear writing instrument is inserted. The rear end of the inner cylindrical shaft 8 of B is configured to serve as a tail plug of the ink occlusion body 3 of the front writing instrument A.
[0010]
In the embodiment, at least one perforation is formed near the rear end of the side surface of the inner cylinder shaft 8.
However, the perforation according to the present invention is provided so that the inner cylinder shaft and the outer cylinder shaft communicate with the inner cylinder shaft, and preferably the inner cylinder shaft side surface away from the bottom surface of the inner cylinder shaft Is provided. In addition, any number of perforations can be provided depending on the size of the writing instrument, but the effect of the present invention can be obtained if at least one perforation is provided.
Further, the shape of the perforations is not particularly limited, and examples thereof include a columnar shape, a columnar shape, and a quadrangular column.
[0011]
Although it does not specifically limit as a material used for the outer cylinder axis | shaft shape | molded with resin which a solvent permeate | transmits, For example, a polypropylene etc. are mentioned.
[0012]
The ink filled in the ink occlusion body 3 and the ink occlusion body 7 used in the present invention is not particularly limited as long as it is an ink made of the same type of solvent, and may be the same color or different color inks.
[0013]
The same type of solvent is not particularly limited as long as it is used as a main solvent for the ink filled in the ink occlusion body 3 and the ink occlusion body 7 and is a solvent that permeates the resin that forms the outer cylinder shaft. For example, a solvent selected from the group consisting of alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, and alkylene glycol ethers such as ethylene glycol methyl ether and propylene glycol methyl ether. I just need it.
[0014]
Moreover, the ink used by this invention should just use a pigment and / or dye as a coloring material.
[0015]
Although it does not specifically limit as a pigment, For example, organic pigments, such as inorganic pigments, such as a titanium oxide and carbon black, for example, a phthalocyanine type, an azo type, an anthraquinone type, a quinacridone type etc. are mentioned. These pigments may be used as they are, or processed pigments surface-modified with a resin, a surfactant or the like may be used.
[0016]
Although it does not specifically limit as dye, For example, what was solubilized or microencapsulated etc. may be sufficient as well as basic dye, acid dye, direct dye, etc. Specific examples of the dye include, for example, “Varifast Black # 1802”, “Varifast Black # 1805”, “Varifast Black # 3820”, “Varifast Violet # 1701”, “Varifast Black” manufactured by Orient Chemical Co., Ltd. “Spiron Violet C-RH”, “Spiron Black CMH special”, “Spiron Yellow C-GNH”, “Spiron Orange” manufactured by Hodogaya Chemical Co., Ltd. GRH "," Spiron Red BEH ", etc., auramine, rhodamine and the like.
[0017]
The amount added to these inks is not particularly limited, and may be an amount according to the solubility and dispersibility of the ink or an amount suitable for a desired hue and density. However, this amount is closely related to the imprint density and the ink discharge amount. If the addition amount is too large, the imprint density increases, but the discharge amount decreases and the life of the writing instrument is shortened. On the other hand, if the amount added is small, the stamping life is prolonged, but the color of the imprint is not good. The amount added to the ink is appropriately selected from the range of usually 3 to 20% by weight with respect to the total amount of ink.
[0018]
In preparing the ink, a vehicle is usually used. Examples of the vehicle include those composed of one type of dispersion resin and one or more of the same types of solvents.
[0019]
Examples of the dispersion resin include polyvinyl butyral resin and ethyl cellulose resin.
[0020]
Components other than those described above may be added to the ink used in the present invention as needed, as long as the properties of the double-headed writing instrument of the present invention are not impaired. Examples of components that can be added include resins, surfactants, preservatives, and dispersion aids.
[0021]
The material used for the ink occlusion body is not particularly limited. For example, sponge rubber, plastic, ceramic, metal sintered body, and the like can be used. Specific examples thereof include acrylic rubber, butyl rubber, and acrylonitrile. -Butadiene rubber, ethylene-propylene rubber, ethylene-butylene rubber, vinyl chloride rubber, EPDM (ethylene-propylene-diene copolymer), PVF (polyvinyl formal), etc. are mentioned.
[0022]
Examples of the resin for forming the inner cylinder shaft 8 and the inner cylinder shaft head 5 include polyethylene and polypropylene.
[0023]
In addition, the resin used for the outer cylinder shaft and the inner cylinder shaft considers the sealing performance by the outer cylinder shaft and the inner cylinder shaft, and the resins are brought into close contact with each other due to the difference in hardness or the softness of the resin. It is preferable to appropriately select a resin that can handle the above, and it is more preferable to select a resin that has a good combination of resin and solvent.
[0024]
The material of the pen core 2 and the pen core 6 according to the present invention may be appropriately selected depending on the use of the double-headed writing instrument of the present invention, and examples thereof include a fiber bundle core and plastic.
In the case of using a fiber bundle core, batting fibers are used, and the kind thereof is not particularly limited, and the outer skin can be used by either film winding or tubing.
[0025]
【The invention's effect】
The double-headed writing instrument of the present invention has the following effects.
In the conventional writing instrument, the inner cylinder shaft formed of polyethylene or polypropylene serves as a tail plug of the ink storage body of each of the front writing instrument and the rear writing instrument, thereby preventing volatilization of the ink filled in the ink storage body. However, there is no perforation that allows the inner cylinder shaft and the outer cylinder shaft to communicate with each other on the rear end side of the inner cylinder shaft from the inner cylinder shaft and outer cylinder shaft fitting portion. Therefore, the amount of increase in the vapor pressure accompanying the increase in the outside air temperature is larger than the solvent used for normal markers, and the ink occlusion body for the front writing instrument that does not have the inner cylinder shaft inserted is removed by permeation. There was a problem that the volatilization loss from the entire surface of the cylinder shaft was increased, and the life of the writing instrument was extremely shorter than that of the rear writing instrument. On the other hand, according to the present invention, the inner cylinder shaft and the outer cylinder shaft are provided with perforations on the rear end side of the inner cylinder shaft so that the inner cylinder shaft and the outer cylinder shaft communicate with each other. By allowing the inner and outer cylinder shafts to communicate with each other, the loss of volatilization from the ink occlusion body in the front writing instrument is mitigated, and the writing life balance of the front writing instrument and the rear writing instrument can be balanced.
Further, if the perforations are provided on the side surface of the inner cylinder shaft that is separated from the bottom surface of the inner cylinder shaft, it is possible to further suppress adverse effects such as ink color mixing.
Furthermore, if the outer cylinder shaft is molded from polypropylene and the inner cylinder shaft is molded from, for example, polyethylene, polypropylene, etc., the sealing performance is good, the cost is low, and the molding is easy.
Furthermore, by selecting a solvent used for the ink, that is, a solvent that permeates the resin, the above effect can be further achieved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a front writing instrument and a rear writing instrument according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the writing instrument in a state where the front writing instrument and the rear writing instrument are integrated.
FIG. 3 is a longitudinal sectional view and a transverse sectional view of an inner cylinder shaft.
[Explanation of symbols]
A Front writing instrument B Rear writing instrument C Double-headed writing instrument 1 Outer cylinder shaft 2 Pen core 3 Ink occlusion body 4 Cap 5 Inner cylinder axis head 6 Pen core 7 Ink occlusion body 8 Inner axis cylinder 9 Cap 10 Space part 11 Perforation 12 Outer cylinder axis Fitting portion

Claims (3)

  A pen core is inserted from the front end of the outer cylinder shaft formed of a resin that allows the solvent to penetrate, and an ink occlusion body filled with ink made of the solvent that permeates the resin is coupled to the rear end of the pen core, The front writing instrument configured to have a required space behind the ink occlusion body, and a pen core is inserted from the inner cylinder shaft head end, and the pen of the same type as the ink in the ink occlusion body is inserted at the rear end of the pen core. An ink occlusion body filled with ink made of a solvent is coupled, the inner cylinder shaft head is coupled to the inner cylinder axis so as to seal the ink occlusion body, and the rear end of the ink occlusion body is connected to the rear end of the inner cylinder axis. A rear writing instrument configured to perform a tail plug, the inner cylinder shaft of the rear writing instrument is inserted into the rear of the ink storage body in the outer cylinder shaft of the front writing instrument described above, and the ink of the front writing instrument is inserted by the inner cylinder shaft. In writing instruments configured to allow the occlusion of the occlusion body Double-ended writing implement and the inner cylinder axis in the cylinder axis side among away from the inner cylindrical shaft bottom and the outer cylinder shaft, characterized in that a perforation communicating.   The double-headed writing instrument according to claim 1, wherein the outer cylinder shaft is formed of polypropylene, and the inner cylinder shaft is formed of polyethylene or polypropylene.   The solvent that permeates the resin contains at least one selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, ethylene glycol methyl ether, and propylene glycol methyl ether. The double-headed writing instrument according to claim 1 or 2.

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