JPH053342Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pen having a writing element such as a fiber tip at its tip, and more specifically, to a pen suitable for a recorder such as an X-Y plotter.

Fiber pens are generally used in X-Y plotters and the like. As is well known, this fiber pen has a structure in which the ink soaked in the batting is guided to a pen core that resembles a hardened tip of a brush, and the ink flows out between the strands of the pen core through capillary action. It is. However, in such fiber pens, as mentioned above, the ink is soaked into the filling, so the amount of ink is 60% compared to the internal volume.
In addition to the inherent drawbacks of relatively low ink levels and low ink utilization, it is also difficult to predict when the ink will run out in advance because the remaining amount of ink cannot be seen. There is a high possibility that the drawing line may become blurred or cut off during operation.

This idea was created in view of the above-mentioned drawbacks of the conventional technology, and its purpose is to provide a pen that can accurately determine the amount of ink remaining and that is particularly suitable for recorders, with a high degree of effective ink utilization. It is in.

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings.

As shown in Figures 1 and 2, the pen comprises an elongated pen body 1 on a barrel. In this embodiment, the pen body 1 has a first tube made of a porous material such as polyester inside.
It has a central shaft holder 2 filled with a guide core 3, and a cylindrical attachment 4 fitted and fixed to the lower end of the central shaft holder 2. A pen tip 5 consisting of
It is installed so that it can come into contact with the

A tank case 6 made of a transparent synthetic resin is fixed to the upper end of the pen body 1 so as to communicate with the center shaft holder 2. Inside this tank case 6, there is an ink storage chamber 7, a leakage storage chamber 9 juxtaposed on the side of this ink storage chamber 7 with a first partition wall 8 interposed therebetween, and a leakage storage chamber 9 from the lower end of the first partition 8. An ink conduction chamber 11 is provided that is partitioned by a second partition wall 10 that extends parallel to the bottom wall of the tank case 6 and projects toward the ink storage chamber 7 . In this case, the ink communication chamber 11 communicates with the bottom of the ink storage chamber 7 through a gap 12 provided between the second compartment 10 and the end and the bottom wall of the tank case 6. It also communicates with the lower part of the leakage storage chamber 9 through the through hole 13, and a second guide core 14 made of, for example, a polyethylene porous material is disposed within the ink communication chamber 11. ing. The liquid leakage storage chamber 9 is open to the atmosphere through an aperture 15 connected to the upper part thereof, and a cylindrical shape having a narrow spiral groove 17 in the peripheral wall is formed in the aperture 15. A screw member 16 is fitted therein. Note that in order to put ink into the ink storage chamber 7, remove the screw member 16 and open the hole 15.
When ink is poured from the ink storage chamber 7, the ink passes through the leakage storage chamber 9, the through hole 13, and the second guide wick 14, and is accumulated in the ink storage chamber 7.

In the above configuration, the ink in the ink storage chamber 7 is guided by the second guide core 14 and the first guide core 3 to reach the pen tip 5, and is supplied from the pores onto a recording paper (not shown). At that time, if the pressure inside the ink storage chamber 7 decreases to below atmospheric pressure, the ink will no longer flow out, but in this invention, the spiral groove 17 of the screw member 16 is
Leakage storage chamber 9, through hole 13 and second guide core 1
4, air enters the ink storage chamber 7 in an amount equal to the amount of ink flowing out, so that an equilibrium state of atmospheric pressure is maintained. Note that outflow of ink due to its own weight in the ink storage chamber 7 is mainly controlled by capillary action of the second guide wick 14.

By the way, when the ambient temperature rises, more ink flows out from the ink storage chamber 7 due to the expansion of the air in the ink storage chamber 7 and the ink itself. Since the liquid leaks into the storage chamber 9 from
There is no chance of ink spilling from the pen tip 5. On the other hand, if the amount of surplus ink in the leakage storage chamber 9 increases or if the X-Y plotter receives vibrations caused by the reciprocating movement of the cartridge, ink may leak from the openings 15. However, according to this embodiment, the excess ink is retained by the capillary action of the narrow spiral groove 17 carved in the peripheral wall of the screw member 16, and is therefore removed from the tank case through the opening 15. 6
There is almost no leakage to the outside. In order to more reliably prevent the leakage, the ink may be retained by filling the leakage storage chamber 9 with a relatively coarse filling that does not cause capillary action. In addition, when filling the inside of the leakage storage chamber 9 with batting in this way, the ink retaining action of the batting causes the through hole 13 to
Since a buffer layer of air is created within the pen and the leakage storage chamber 9 and the second guide wick 14 are separated, the amount of ink supplied to the pen tip 5 can be maintained more appropriately. Furthermore, even if this pen is turned upside down, the first and second partition walls 8 and 10 prevent the ink in the ink storage chamber 7 from flowing out through the ink conduction chamber 11 and the leakage storage chamber 9. I don't have to worry about it. In addition,
In the above embodiment, the pen tip 5 made of synthetic resin fiber is used, but it may be replaced with a ball tip. Furthermore, a screw member 16 having a spiral groove 17 that causes a capillary phenomenon is also fitted in the opening 15 connected to the upper part of the leakage storage chamber 9, but the point is that the leakage storage chamber 9 and the upper wall of the tank case 6 may be provided with an air passage that generates a capillary phenomenon sufficient to prevent excess ink from leaking.

On the other hand, FIG. 3 shows a modified embodiment of this invention. That is, according to this, unlike the above embodiment, the first guide core is not packed inside the center shaft holder 2, and the center shaft holder 2 is communicated with the bottom of the ink storage chamber 7' of the tank case 6. ing.
Furthermore, in the tank case 6, an ink storage chamber 7' and a leakage storage chamber 9' are juxtaposed with the first compartment 8' in between. It communicates with the bottom of the ink storage chamber 7' through a through hole 13' formed in the ink storage chamber 7'.
0 is inserted. In this modified embodiment as well, the leakage storage chamber 9' communicates with the atmosphere through an aperture 15' connected to the upper part of the chamber 9'. Similarly, a plug 21 with good air permeability made of a polyethylene porous material, for example, is fitted. Further, as in the above embodiment, the leakage storage chamber 9' may be filled with ink retaining batting. In addition, reference numeral 2
Reference numerals 2 and 23 designate cover members that are watertightly attached to the upper and lower parts, respectively.

As is clear from the above description of the embodiments, according to this invention, since the tank case is made of a transparent synthetic resin, it is possible to know at a glance the amount of ink remaining in the ink storage chamber. - When used in a computer terminal such as a Y plotter, unexpected situations such as running out of ink can be prevented. Furthermore, ink can be used more effectively than in the conventional method in which ink is impregnated into batting and retained. Furthermore, since a leakage storage chamber is provided, even if the ambient temperature rises, excess ink from the pen tip will not seep out, and the recording quality will remain constant. It is. In addition, in this invention, the ink used does not matter whether it is water-based or oil-based.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the pen according to this invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1,
FIG. 3 is a longitudinal sectional view showing a modified embodiment of this invention. In the figure, 1 is the pen body, 3 is the first guide lead, 5 is the pen tip, 6 is the tank case, 7 is the ink storage chamber, 8 is the first partition, 9 is the leakage storage chamber, and 10 is the second ink storage chamber. Partition wall, 11 is ink conduction chamber, 13 is through hole,
14 is a second guide core, 15 is an opening, 16 is a screw member, and 17 is a spiral groove.

Claims (1)

[Claims for Utility Model Registration] A pen having a cylindrical pen body with a pen tip attached to one end, the ink being guided to the pen tip through the pen body, wherein the bottom part is at the other end of the pen body. Equipped with a tank case made of a transparent body attached so as to communicate with the
Inside the tank case, an ink storage chamber and a leakage storage chamber whose upper end is open to the atmosphere are arranged side by side with a partition wall in between. A pen characterized in that the space between the holes is communicated through an inductive core made of a porous material.