JPH0453365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an ink supply device for an ink writing recorder, and particularly to the structure of an ink container for supplying ink to a pen tip.

[Technical background of the invention]

Ink writing recording devices that record measured waveforms on recording paper using ink include one-channel devices that record one waveform, but devices with several channels to more than ten channels or more are also widely used. In this case, a multi-element type ink writing and recording apparatus usually uses a multi-element concentrated type ink container because it is easy to fill with ink and has a simple structure. Such an ink container has heretofore been constructed as disclosed in Japanese Utility Model Publication No. 57-47707. That is, as shown in FIGS. 3 and 4 as a plan view and a cross-sectional view, respectively, this ink container has a container body 1 made of a rectangular hollow member cut into a length corresponding to the number of elements.
A housing is formed by screwing side plates 3 to both end faces of the container body 1 via packing 2, and a pressurizing device 4 corresponding to the number of elements and an ink level indicator 5 are mounted on the top surface of the container body 1.
and a cap holder to which a cap 6 having an air escape port 6a formed in the center is mounted. Then, with the check valve provided in the pressurizing device 4 closed, a push button also provided in the pressurizing device 4 is pressed, and the pen tip (not shown) is inserted through the thin tube in the pressurizing device 4. It was designed so that ink was pumped through, filling the thin tube leading to the tip of the pen, and then the push button was returned to its original position. From then on, ink was sent to the tip of the pen one after another by capillary action. .

[Problems with background technology]

In the conventional ink writing recorder configured as described above, when the liquid level 11a of the ink 11 filled in the container body 1 is higher than the position of the tip of the pen, the ink 11 is pushed away from the tip of the pen due to head pressure. If too much ink comes out, or if the liquid level 11a is lower than the tip of the pen, negative head pressure will be applied, making it difficult for the ink 11 to come out from the tip of the pen, causing problems such as blurred lines. Ta. Further, when replenishing the ink 11, the cap 6 must be removed and ink must be poured into the container body 1 from another ink container, which has the disadvantage that it may spill around the container body 1 and stain it.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and is capable of supplying a stable amount of ink to the tip of the pen.
An object of the present invention is to provide an ink supply device for an ink writing recorder with good ink replenishment workability.

[Summary of the invention]

In the present invention, there is provided a first tank provided with one end of a passage for supplying ink to the tip of the pen and provided with an air port;
A constant liquid level control device having two passages in the vertical direction communicating the inside and outside of the tank, and a constant liquid level control device that is detachable from the constant liquid level control device and when installed, the inside thereof is connected through the two passages. and a second tank communicating with the inside of the first tank, the lower ends of each of the two passages being at different heights inside the first tank.

In such a configuration, when injecting ink into the first tank, the second tank filled with ink is attached to the constant liquid level control device. In this way, the ink in the second tank flows into the first tank through two passages. At a certain point when the lower ends of the two passages in the first tank are both immersed in ink, the ink stops flowing into the first tank. This is due to the atmospheric pressure exerted on the ink liquid level in the first tank, the pressure exerted on the ink liquid level by the ink liquid above this ink liquid level, and the gas pressure (negative pressure) in the upper part of the second tank. ) are balanced.
The tip of the pen is supplied with ink from the first tank by osmotic pressure. Therefore, the ink level in the first tank decreases. When this ink liquid level passes the higher position of the lower end of the two passages, air enters from this lower end, this air becomes bubbles, passes through this one passage, and then goes to the second tank. The ink flows upward through the ink and mixes with the gas at the top of the second tank. At this time, in the other passage, an amount of ink corresponding to the air that has entered the second tank flows into the second tank.
from the tank to the first tank, and reaches the first tank. At this time, the liquid level in the first tank rises and closes the lower end of the one passage. Therefore, the flow of air into the second tank is stopped, and the flow of ink from the second tank to the first tank is also stopped.

When ink is further supplied to the tip of the pen and the liquid level in the first tank falls, air flows into the second tank from one passage again in the same way as above, and ink flows from the other passage into the first tank. flows into the tank.
The above operation is repeated while ink is being supplied to the pen. In this way, the liquid level in the first tank is maintained at a constant position.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an ink supply device for an ink writing recorder according to the present invention will be described below with reference to the drawings.

1 and 2 are a side sectional view and a cross sectional view, respectively, showing an embodiment of the present invention. In these figures, parts that are the same or equivalent to those of the conventional example shown in FIGS. 3 and 4 are designated by the same reference numerals. A plurality of pressurizing devices 4 are provided laterally on the upper surface of the container body 1 filled with ink 11, and an O-ring 1 is inserted into the hole 1a formed in the upper surface of the container body 1.
2, the tip of which is attached to the ink 11
immersed in it. An opening 4a is formed at the tip of this pressurizing device 4, and a check valve 8 is provided inside this opening 4a. Further, on the opposite side of the opening 4a of this pressurizing device 4, a piston 14 biased upward by a spring 13 is installed at an O-
It is slidably provided on the inner diameter surface of the pressurizing device 4 via a ring 15, and a thin tube 10 for feeding ink 11 is formed inside this piston 14.
By pushing the push button 9 provided at the upper end of the piston 14 downward against the biasing force of the spring 13, the ink 11 is forced into the thin tube 10 and delivered to the tip of the pen (not shown). ing. A recess 1b is formed approximately in the center of the upper surface of the container body 1, and a disposable tank 15 filled with ink 11 is disposed in the recess 1b.
A constant liquid level control device 17 is provided, which has a mounting portion 16 to which the liquid level control device 17 is removably attached. This constant liquid level control device 17 has a tubular shape with an inner diameter partitioned into two parts by a partition wall 17a, and the lower end surface of one part is located at approximately the same position as the inner wall surface of the recess 1b, The lower end surface of the other portion further projects downward. Then, the inner wall surface of the recess 1b becomes a controlled constant liquid level of the liquid level 11a of the ink 11 filled into the container body 1. Said disposable tank 1
5 and the inside of the container body 1 communicate with each other via a constant liquid level control device 17, and an air escape port 1c is formed in a part of the recess 1b. This disposable tank 15 is made of synthetic resin such as polyethylene, and has mounting holes 15a on the bottom surface.
This mounting hole 15a is covered with a cap 18 before use.

In this embodiment, the container body 1 is the first tank, and the disposable tank 15 is the second tank.

The operation of this embodiment configured as described above will be described below. When the mounting hole 15a of the disposable tank 15 filled with ink 11 and whose mounting hole 15a is covered with the cap 18 is inserted into the upper end of the mounting part 16 of the constant liquid level control device 17, the slit attached to the cap 18 is pushed and the ink is expanded. 11 flows into the container body 1. ink 11
When the ink reaches the inner wall surface of the recess 1b, the lower end surface of the short side of the constant liquid level control device 11 is sealed by the ink 11, so that the air pressure in the disposable tank 15 becomes negative pressure with respect to the atmospheric pressure. The ink 11 stops flowing from the container body 1, and the liquid level 11a of the ink 11 becomes constant at a position substantially aligned with the inner wall surface of the recess 1b. When recording is performed with a pen and the ink 11 in the container body 1 flows out through the thin tube 10 due to capillarity, the ink level 11a moves away from the lower end of the short side of the constant liquid level control device, and the disposer Since air flows into the bull tank 15, the ink 11 flows into the container body 1 again until it reaches the constant liquid level. In this way, the liquid level 11a of the ink 11 within the container body 1 is always kept constant. By adjusting the position of the pen tip relative to this constant liquid level so that the ink flow rate at the pen tip is most appropriate, the ink 11 will not come out too much or become blurred during recording.
Clear waveforms can always be recorded with appropriate density. Further, the disposable tank 15 can be attached to the container body 1 with one touch, and will not leak even if removed, so that the surrounding area is not contaminated when ink is refilled, and work efficiency is improved.

〔Effect of the invention〕

According to the present invention, since the liquid level of the ink in the first tank is constant, a stable amount of ink can be supplied to the tip of the pen, and the second tank is detachable from the constant liquid level control device. This makes refilling the ink extremely easy.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of an ink supply device for an ink writing recorder according to the present invention, FIG. 2 is a cross sectional view of FIG. 1, and FIG. A plan view showing the supply device, and FIG. 4 is a sectional view taken along line AA in FIG. 3. 1... Container body, 11... Ink, 11a...
Liquid level, 15... Disposable tank, 17...
...Constant liquid level control device.

Claims (1)

[Claims] 1. A first tank provided with one end of a passage for supplying ink to the tip of the pen and provided with an air port;
A constant liquid level control device provided in the first tank and having two passages in the vertical direction communicating the inside and outside of the first tank, and a constant liquid level control device that is detachably attached to the constant liquid level control device. and a second tank whose interior communicates with the interior of the first tank via the two passages, and the lower ends of each of the two passages are connected to each other inside the first tank. An ink supply device for an ink writing recorder characterized by being located at different heights.