JPH0560885U - Writing instrument - Google Patents

Abstract

(57) [Summary] [Structure] In the pen tip holder-2, the synthetic resin pen tip 1
The ink guiding member 3 and the ink guiding member 3 are separated from each other by the hole 2c. Here, the central hole portion is composed of a front ink passage portion 2d having a capillary force not larger than the capillary force of the pen tip 1 and a rear ink supply portion 2e having a capillary force smaller than the front ink passage portion 1d. .. [Effect] Since the pen tip can be shortened and the capillary force of the inner hole is increased in the front to increase the ink supply force to the pen tip, it is excellent in high-speed writing performance in a stable ink discharge state. Become.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a writing instrument having a synthetic resin pen tip having an ink passage penetrating in the longitudinal direction.

[0002]

[Prior Art]

 As a writing instrument of the above-mentioned type, a writing tool in which a rear part of a synthetic resin pen tip is embedded in an ink occlusion body composed of a fiber bundle is generally used. The ink is supplied directly from the ink chamber to the pen tip.

On the other hand, in recent years, the type in which an ink guiding member is interposed is increasing. That is, the pen tip made of synthetic resin is inserted into the pen tip insertion portion of the pen tip holder so as to project the tip, and the ink guide member is inserted into the ink guide member insertion portion of the pen tip holder. .. Here, the rear end of the pen tip is embedded or sufficiently abutted on the front end of the ink guide member.

As is well known, the ink guide member is made of fibers aligned in the longitudinal direction, and holds ink by capillary force and supplies it to the pen tip. Since the capillary force of the member can be set appropriately, it has become so popular in recent years that it has a so-called raw ink structure (the ink chamber does not contain ink by the capillary force like the ink absorber described above). Can also be applied. In addition, compared to the amount of ink that the pen tip can hold, an extremely large amount of ink can be held in the ink guide member, as if the ink chamber were extended to the front. The length of the pen tip can be shortened, and the resistance that the ink receives from the pen tip while passing through the ink passage of the pen tip is reduced accordingly, resulting in improved high-speed writing performance and faint writing even when writing quickly. It also has the advantage of disappearing.

[0005]

[Problems to be Solved by the Invention] Recently, the number of writing instruments used in automatic drafting machines such as plotters has increased, but tens of centimeters per second or more is required to make writing instruments satisfactory for these devices. It is required to have high-speed writability that cannot be compared with normal handwriting, such that handwriting does not occur even when writing at the speed of. On the other hand, there is a limit to how far the front end of the ink guiding member can be positioned in the pen tip holder. Therefore, it is required to further improve the high-speed writability by interposing an ink guide member.

[0006]

[Means for Solving the Problems]

 The pen tip and the ink guide member are positioned apart from each other without being brought into contact with each other in the pen tip holder. This separated portion does not of course interrupt the ink ejection. Capillary force is weak, but it should be a part that can hold a sufficient amount of ink. However, the capillary force of the portion is weak, and the capillary force becomes weaker if the nib having a strong capillary force is shortened. Therefore, it is necessary to sufficiently supply the ink to the pen tip. The present invention has been made based on such an idea, and a synthetic resin pen tip having an ink passage penetrating in the longitudinal direction is inserted into the pen tip insertion portion of the pen tip holder so as to protrude, In addition, in a writing instrument in which an ink guide member for supplying ink in an ink chamber to the pen tip is inserted into an ink guide member insertion portion of the pen tip holder, a pen tip insertion hole portion of the pen tip holder is provided. Between the ink guiding member insertion hole, a front ink channel having a capillary force not larger than the capillary force of the pen tip, and a rear ink supplying unit having a capillary force smaller than the capillary force of the front ink channel. The gist of the present invention is to provide a writing instrument having an intermediate hole portion made of, and positioning the pen tip and the ink guiding member with the intermediate hole portion.

[0007]

【Example】

 An example will be described with reference to FIGS. 1 to 4. Reference numeral 1 is a synthetic resin pen tip. For example, an appropriate resin such as polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, etc. may be used in combination with a fine fiber material, etc., if necessary, and extruded / thinned into a predetermined shape. It was obtained by cutting it into lengths and shaping the tip into a shape for writing contact. It has an ink passage 1a penetrating in the longitudinal direction, for example, as shown in FIGS. 3 (a) and 3 (b), having an appropriate cross-sectional pattern, and is inserted into the pen tip insertion portion 2a of the pen tip holder-2. The tip is protruding. Although the rear end of the pen tip 1 has a vertically cut shape, it is taken into consideration for simplification of the process, and of course, it may have an appropriate shape such as hemispherical shape or shell shape. ..

The ink guide member 3 is inserted into the ink guide member insertion portion 2b of the pen tip holder-2. In addition to the fiber bundles described above, they may be made of, for example, a communicating porous foam or a sintered body. In FIG. 1, the rear portion 3a is inserted into the inner hole 4a of the temporary ink fountain member 4 having the temporary ink fountain portion having a comb-shaped vertical cross section, and the rear end (not shown) is formed as necessary. Although it extends to the inside of an ink tank (not shown), the type of writing instrument can be a type that uses an ink occlusion body instead of the raw ink type. .. Reference numeral 5 in FIG. 1 is a shaft, and reference numeral 6 is an air hole.

As shown in an enlarged view in FIG. 2, the nib 1 and the ink guide member 3 are not in contact with each other in the nib holder-2. There is a hole 2c between the nib insertion portion 2a and the ink guiding member insertion portion 2b, and they are located apart from each other.

The inner hole portion 2c is not a straight tubular member having an appropriate cross section, but is composed of a front ink passage portion 2d and a rear ink supply portion 2e. The front ink passage portion 2d is not necessarily a straight tube shape as shown in the drawing, and may have a capillary force change in the longitudinal direction, but it has a larger capillary force than the pen tip 1. Therefore, it has a capillary force equal to or, preferably, a small capillary force of the nib. Further, the rear ink supply portion 2e has a smaller capillary force than that of the front ink passage portion 2d. Here, it is preferable that the inner hole portion 2c as a whole has a gradually increasing capillary force toward the front, and the rear ink supply portion 2e has a truncated cone shape. Further, the capillary force of the rear ink supply portion 2e may be such that it does not substantially contribute to ink retention. That is, ink cannot be substantially retained only by its own capillary force, and since the nib 1 and the ink guiding member 3 are present, the capillary force is so large that ink can be retained in the rear ink supply section 2e. It may be small. The rear ink supply portion 2e shown in the figure is also shown as a large diameter one having a cross section of a simple shape such as a circle.

Next, another example will be described with reference to FIGS. 5 and 6. As for the difference from the previous example, first, the front ink path portion 2d is divided into a plurality of parts. This is an example in which the front inking road portion 2d may have an appropriate shape. In addition, the flesh portion 2f that divides the front ink passage portion 2d into a plurality of portions extends in the rear ink supply portion 2e and contacts the ink guiding member 3 at the rear end, which also contributes to the positioning of the ink guiding member 3. There is. The portion of the flesh portion 2f located inside the rear ink supply portion 2e has a radial rib having a recess on the side wall and is a part of the wall of the ink supply portion 2e. It is intended to give a large and small distribution of the capillary force in the cross section. Also, a portion having a large capillary force continues from the ink guiding member 4 forward to the front ink passage portion 2d as it is. The advantage of doing so is that even if air partially exists in the rear ink supply section 2e, the air exists in the rear ink supply section 2e where the capillary force is relatively weak. Therefore, the ink is continuously present from the ink guiding member 3 to the front ink passage portion 2d, and the interruption of the ink discharge can be suppressed. Further, the rear end of the pen tip 1 has a slight gap 7 with the front end of the meat portion 2f. This gap 7 prevents the rear end opening amount of the ink passage 1a from being different depending on the pen tip insertion direction (transverse phase) when the rear end of the pen tip 1 is in contact with the meat portion 2f. It is a distribution passage for effectively supplying the ink in the ink passage portion 2d to the ink passage 1a of the pen tip 1.

[0012]

[Effect of the device]

 In the writing instrument of the present invention, a synthetic resin nib having an ink passage penetrating in the longitudinal direction is inserted into the nib insertion portion of the nib holder so as to project the tip, and the ink in the ink chamber is inserted into the nib. In a writing instrument in which an ink guide member to be supplied is inserted into an ink guide member insertion portion of the pen tip holder, the ink guide member is inserted between the pen tip insertion hole portion and the ink guide member insertion hole portion of the pen tip holder. The front ink passage part having a capillary force not larger than the capillary force of the pen tip and the rear ink supply part having a capillary force smaller than the capillary force of the front ink passage part are provided in the middle hole part. Since the pen tip and the ink guide member are located apart from each other by the hole, the pen tip can be shortened by the presence of the hole, and the capillary force of the hole increases in the front. thing Since the to become have been can be enhanced ink supply power to the pen tip, and is excellent in high speed writing properties than the conventional a stable ink discharge state.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a pen tip portion of FIG.

3 is a cross-sectional view taken along the line AA of FIG. An example of the cross-sectional shape of the pen tip is shown.

4 is a cross-sectional view taken along the line BB of FIG. The cross-sectional shape example of a front ink path part is shown.

FIG. 5 is a longitudinal sectional view corresponding to FIG. 2 showing another embodiment of the present invention.

6 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 1 Nib 1a Ink passage 2 Nib holder-2a Nib insertion part 2b Ink guide member insertion part 2c Medium hole part 2d Front ink path part 2e Rear ink supply part 2f Meat part 3 Ink induction member 4 Temporary ink reservoir member 5 Axis 6 Air hole 7 Gap

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin pen tip having an ink passage penetrating in the longitudinal direction is inserted into a pen tip insertion portion of a pen tip holder so as to project the tip, and ink in an ink chamber is supplied to the pen tip. In the writing instrument formed by inserting the ink guide member into the ink guide member insertion portion of the pen tip holder, the pen tip is provided between the pen tip insertion hole portion and the ink guide member insertion hole portion of the pen tip holder. A front ink path portion having a capillary force not larger than that of the front ink passage portion and a rear ink supply portion having a capillary force smaller than the capillary force of the front ink passage portion. A writing instrument in which a pen tip and the ink guiding member are separated from each other.