JP2517638Y2 - Writing instrument - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] A temporary ink reservoir member is interposed between the pen tip and the ink tank, and an ink lead for supplying the ink from the ink tank to the pen tip in the inner hole of the temporary ink reservoir member. It relates to a writing instrument that is inserted.

[0002]

2. Description of the Related Art The above-mentioned writing instrument is a kind of what is generally called a raw ink type writing instrument. It is based on the idea that the temporary ink reservoir member and the ink lead are responsible for suppressing ink leakage due to changes in internal and external pressures and for supplying ink from the ink tank to the pen tip.

Here, the important thing is the exchange of ink and air, and when ink is temporarily stored in the ink reservoir member, it is assumed that the retreat of ink to the ink tank side due to a decrease in internal pressure has priority over the invasion of air, and It is desirable that the invaded air does not unnecessarily stay in the inner hole of the temporary ink reservoir member or move to the pen tip side in order not to impair the ink dischargeability.

As one means for solving this, a tight insertion portion is formed between the inner hole of the temporary ink reservoir member and the ink guide, and the inner and outer communication portions for ink / air exchange are temporarily formed. It is to be formed in a portion of the dynamic ink reservoir member behind the tight insertion portion. The invading air is prevented from moving forward (on the pen tip side) from the tightening portion. Also,
If a slit is formed in the temporary ink reservoir to communicate with this tight fitting part, the slit will be a part that allows ink to pass but does not allow air to pass. A slit may be formed for movement.

[0005]

However, on the other hand, on the other hand, the formation of the tight-fitting portion increases the resistance of the ink supply to the pen tip (negative pressure is generated in the inner hole portion of the temporary ink reservoir member). Will also occur. This shortcoming is not a problem when the writing speed is slow and the ink movement to compensate for the ink consumed by the pen tip is slow and it is not a problem when it is in time, but when the writing speed is fast, the handwriting is faint or cut. Resulting in. This is because even if the writing speed is constant, it is not possible to completely change the ink consumption over time (for example, when writing on paper, the amount of ink absorbed by the paper is microscopically In addition, it is virtually impossible to think that the writing speed will be completely constant. Therefore, if the writing speed becomes faster, the rate of change in negative pressure at the inner hole of the temporary ink fountain member will increase. It is thought to be because.

[0006]

According to the present invention, a temporary ink reservoir member is interposed between a pen nib and an ink tank, and ink in the ink tank is inserted into an inner hole of the temporary ink reservoir member. Is a writing instrument in which an ink lead to be supplied to the ink guide is inserted, and a tight fitting portion is formed between the inner hole of the temporary ink reservoir member and the ink lead, and an inner / outer communication portion for ink / air exchange. Between the ink guide core and a portion of the inner hole of the temporary ink fountain member in front of the tight insertion part. A writing instrument is characterized in that a loose insertion portion is formed in the air passage, and an air passage is communicated with the loose insertion portion.

[0007]

In the loose insertion portion, the inner hole of the temporary ink reservoir member and the ink lead form a portion for holding ink with a weak capillary force. An air passage communicates with the loose insertion portion. Therefore, the negative pressure in the inner hole portion of the temporary ink reservoir member due to writing is alleviated by supplying the ink held by the weak insertion force with the weak capillary force to the pen tip. In addition, the supply of this ink to the pen tip at the loose insertion part is replaced by the presence of air. However, the more air there is, the more the ink tends to fill up. The change in ink consumption is also alleviated by the ebb and flow of ink.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 1 showing an example of a ball-point pen, a temporary ink reservoir member 1
Is an example of a very general one having a temporary ink reservoir groove 2 having a comb-shaped vertical section, an inner hole 3, and a slit 4 connecting the temporary ink reservoir groove 2 with each other. The tip 6 holding the ball 5 is projected and fixed to the tip, and
An ink guide core 7 extending into the tip 6 is inserted into the inner hole 3, and itself is fixed by a shaft cylinder 10 while sealing an ink tank 9 by an annular elastic body 8. Here, the ink guide core 7 is shown in consideration of a fiber bundle, but it may be a communicating porous sintered body or a foamed body. Further, as the ink tank 9, the inner space of the shaft cylinder 10 is used as it is, but a replaceable cartridge may be used.

Reference numeral 11 indicates an internal / external communication portion for ink / air exchange, which is in series with the slit 4. Air enters the ink tank 9 from the inside / outside communication portion 11 through the inside hole 3. However, from the portion indicated by reference numeral x in FIG. 1 to the front portion indicated by reference numeral y (see FIG. 2), the ink guide core 7 is a tight insertion portion 12 which is tightly inserted in the inner hole 3. Air is prevented from moving forward of the x section. Although a part of the slit 4 is connected to the inner hole 3 at two positions of the tight fitting portion 12, only the ink communicates with each other as described above.

As shown in FIG. 2, a loose insertion portion 13 is formed in front of the y portion. The front end of the loose insertion part 13 is appropriate,
In some cases, it may extend to the back of the ball 5. Ink is held in the loose insertion portion 13 when not in use. However, as described above, the ink can move due to a small pressure change.

An air passage 14 communicates with the loose insertion portion 13.
If the ink has a size that is not retained,
The shape is appropriate, such as a pinhole shape as shown in FIG. 4 or a slit shape as shown in FIG. The one shown in the drawing is formed as a branch passage from the opening end 15 as an air hole.

Although the above description has been given through an example, various modifications can be made without departing from the scope of the invention. For example, the type of writing instrument is appropriate, such as a fiber pen, a small tube type writing instrument, an applicator having a brush tip as a pen tip, and also as a temporary ink reservoir member, a temporary ink reservoir having a spiral shape. Further, the members may be appropriately integrated or separated, and, for example, as shown in FIG. 5, the temporary ink reservoir member 1 includes the front member 1a and the rear member 1b.
It is also possible to form the air passages 14 at their connecting portions. By the way, in the one shown in FIG. 5, the portions indicated by reference numerals 14a and 14b are slit portions, and the portions indicated by 14c, 14d and 14e are circumferential space portions, and the circumferential space portions 14c, 14d and 14 are shown.
e is a compensator in case the ink tries to overflow through the air passage 14, and the air hole opening end 1
It is independent of 5.

[0013]

The writing instrument of the present invention interposes a temporary ink reservoir member between the pen tip and the ink tank, and supplies the ink of the ink tank to the pen tip in the inner hole of the temporary ink reservoir member. A writing instrument in which an ink guide core is inserted, and a tight fitting portion is formed between the inner hole of the temporary ink reservoir member and the ink guide core, and an inner / outer communication portion for ink / air exchange, In the temporary ink reservoir member which is formed at a portion rearward of the tightening portion, the temporary ink reservoir member has an inner hole formed between the ink guide core and a portion in front of the tightening portion. Since the insertion part is formed and the air passage is communicated with this loose insertion part, the resistance to ink ejection during writing can be reduced and its change can be reduced, and blurring and breakage can be suppressed as much as possible. You can get clear handwriting.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a view corresponding to FIG. 3 showing an example of the shape of an air passage.

FIG. 4 is a view corresponding to FIG. 2 showing an example of forming an air passage.

[Explanation of symbols]

 1 Temporary ink reservoir member 1a Front member 1b Rear member 2 Temporary ink reservoir groove 3 Inner hole 4 Slit 5 Ball 6 Chip 7 Ink lead core 8 Annular elastic body 9 Ink tank 10 Shaft cylinder 11 Inner / outer communication part 12 Tight insertion part 13 Loose insertion part 14 Air path 14a Slit part 14b Slit part 14c Circular space part 14d Circular space part 14e Circular space part 15 Air hole opening end

Claims (1)

(57) [Scope of utility model registration request] 1. A temporary ink reservoir member is interposed between a pen tip and an ink tank, and an ink lead for supplying ink from the ink tank to the pen tip is inserted into an inner hole of the temporary ink reservoir member. A writing instrument that is worn, forming a tight fitting portion between the inner hole of the temporary ink reservoir member and the ink guide, and providing an inner / outer communication portion for ink / air exchange to the temporary ink reservoir member. , Which is formed in a portion rearward of the tight fitting portion, of the inner hole of the temporary ink reservoir member,
A writing instrument characterized in that a loose insertion portion is formed between a portion in front of the tight insertion portion and the ink guide, and an air passage is communicated with the loose insertion portion.