JP3113512B2 - Ink jet recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink tank unit for supplying ink to a recording head of an ink jet system, and a recording apparatus having the same.

[0002]

2. Description of the Related Art As in the present invention, Japanese Patent Application Laid-Open No. 5-201021 discloses a device having a plurality of ink storage chambers. This includes a plurality of compartments (21a to 21f) partitioned as shown in FIG. 11, and a supply port 25 for supplying the recording liquid to the outside of the container is provided in one of the plurality of chambers 21f. An atmosphere communication hole 24 for opening to the atmosphere is provided in a chamber 21a different from the chamber in which the supply port is provided, and each of the plurality of chambers is connected only by the continuous liquid supply member 23. It has a configuration. Here, the process of consuming ink in JP-A-5-201021 will be described. As the ink is consumed through the supply port 25 by driving the recording head, the supply port 2
The ink in the sixth chamber 21f provided with 5 is sucked out in an amount corresponding to the consumption amount. Since the sixth chamber 21f is only connected to the fifth chamber 21e via the liquid supply member 23 in addition to the supply port 25, the amount of ink sucked from the sixth chamber 21f to the supply port 25 is reduced. The liquid is supplied from the fifth chamber 21e through the gap of the liquid supply member 23. Similarly, ink is supplied to the supply port 25 continuously by sequentially supplying ink from the chamber near the air communication hole 24. When there is no ink that can be supplied to a chamber adjacent to the atmosphere communication hole 24, the air supplied from the atmosphere communication hole 24 is supplied through the liquid supply member 23.
In this manner, the ink is consumed in order from the chamber near the air communication hole 24 as shown in FIG. 12 of this manual.

[0003]

According to the prior art, for example, in the configuration of FIG. 11, the ink is consumed in order from the chamber 21a near the air communication hole 24 with the consumption of the ink. A considerable difference occurs in the ink supply resistance between the filled initial state and the state in which the remaining amount of ink is low (FIG. 12), and the ink discharge by the print head is not uniform. In other words, in the case of FIG. 11, the ink is supplied from the sixth chamber 21f to the second chamber 21b.
Figure 1
In the case of 2, only the resistance between the sixth chamber 21f and the fifth chamber 21e is received. Specifically, in the case of this configuration, the ink supply resistance occurs in the portion of the liquid supply member 23 where the ink is present, and the frictional resistance when the ink moves is larger in the case of FIG. it is obvious. This is because the chambers (21a to 21f) are arranged in series with the ink supply port 25 and the atmosphere communication hole 24, and this is an unavoidable problem beyond adopting this structure. This problem becomes more pronounced as the size of the ink tank increases. In the supply of ink, when the supply resistance is high, the amount of ink droplets discharged in response to the driving of the recording head decreases, and when the supply resistance is low, the amount of ink discharged increases. Therefore, in the case of the related art, the amount of ink discharged from the recording head becomes unstable due to the amount of ink inside the ink tank.

In Japanese Patent Application Laid-Open No. Hei 5-201021, ink in each chamber is held by a capillary force acting on a porous member as a liquid supply member to prevent leakage to the outside. The amount of ink that can be held is small. The reason is that in the case of this prior art, the purpose is to store more ink in a predetermined volume of space,
That is, since the ink storage efficiency is improved, the amount of the porous member is smaller than the amount of the ink to be stored, and the load per unit volume of the porous member that intends to hold the ink is large. For this reason, it was impossible for the prior art to store a large amount of ink. Specifically, the porous body and the fiber bundle when used as an ink holding material are usually
The gaps between the microwalls and fibers that constitute them are 100 to several hundred μ
m, and the height of the ink liquid in which ink can be impregnated by capillary force has a surface tension of 50 (d
yne / cm), density 1 (g / cm), contact angle 60 (d
eg. In the case of (1), the maximum height is about 5 cm. Therefore, for example, if the installation direction of the ink tank is not limited as in a recording device that can be carried around, it is necessary to always keep the ink in the porous member so that the ink does not leak out. The size of the ink tank is limited to a size that does not exceed 5 (cm) on one side, and it is impossible to store a large amount of ink. (Of course, this is the case where the ink tank and the recording apparatus can be used irrespective of the installation direction, and this is not limited to the stationary type ink tank.) Further, the conventional ink jet recording apparatus As a matter of course, it has been necessary to replenish the ink, which is a consumable, in accordance with the used amount. In addition, as other methods, there were a method in which the ink tank was replaced as a cartridge type, and a method in which the print head was also integrated and replaced, etc. Had to be replaced.

[0005]

According to a first aspect of the present invention, there is provided an ink jet recording apparatus including an air communication hole and a filter, each of which is filled with a porous body or a fiber bundle impregnated with ink. And a common ink reservoir adjacent to the filter portion of each of the ink storage chambers and one ink supply port provided with the ink reservoir. The common ink reservoir is provided with the ink supply port through the ink supply port. An ink jet recording apparatus for supplying ink to a print head.

According to a second aspect of the present invention, in the ink jet recording apparatus, the pores of the porous body or the fiber bundle in the ink storage chamber are denser on the filter portion side than on the air communication hole side. 2. The ink jet recording apparatus according to claim 1, wherein:

According to a third aspect of the present invention, there is provided an ink jet recording apparatus according to the first aspect, wherein the shape of the ink storage chamber is smaller at the filter portion side than at the air communication hole side. It is.

[0008]

According to the ink jet recording apparatus of the first aspect, in the ink tank having a plurality of ink storage chambers, the ink in each ink storage chamber is not consumed in order but is uniformly consumed. It is possible to reduce the fluctuation of the supply resistance between the initial state and the time when the ink is used up, and to stabilize the ejection of the ink by the print head all the time.

According to the ink jet recording apparatus of the second aspect, in the ink tank filled with the porous member,
The amount of ink that remains in the porous member and cannot be used can be reduced, and the use efficiency of the ink is improved. Therefore, the size of the ink tank can be reduced. Further, since the amount of ink that cannot be used and is discarded is reduced, the cost can be reduced accordingly.

According to the ink jet recording apparatus of the present invention, since the cross-sectional area of the ink tank on the filter arrangement side is reduced, the columnar porous member is simply filled (pushed in) to form the filter on the filter side. The members can be made dense, and the amount of ink remaining in the porous member can be reduced.

[0011]

【Example】

(Embodiment 1) An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is an external view of an ink jet recording apparatus equipped with the ink tank of the present invention. The recording head 1 is fixedly mounted on a carriage 2, and the carriage 2 reciprocates along a platen 3 to record on a recording sheet wound around the platen 3. The ink supply tube 4 connects an ink supply port (not shown) of the ink tank 11 to the recording head 1 to supply ink.

FIG. 2 is a sectional view of the ink tank 11 of the present invention. A plurality of ink storage chambers 14 are independently connected to a common ink reservoir 13 via a filter 17. A porous member (general term for a porous body or a fiber bundle) 15 impregnated with ink is disposed inside. Further, each of the ink storage chambers 14 has an independent air communication hole 16.

Next, the process of consuming ink will be described. In FIG. 2, an ink amount corresponding to the recording amount of the recording head is naturally supplied to the recording head from the common ink reservoir 13 filled with the ink via the ink supply port 12 and the ink supply tube. In the common ink reservoir 13, the same amount of ink as the consumed ink amount is supplied from the ink storage chamber 14 via the filter 17. In each of the ink storage chambers, the same amount of air as the consumed ink amount is introduced from the outside through the atmosphere communication holes 16. When the ink in each of the ink storage chambers 14 is consumed as described above, each of the ink storage chambers 14 is connected to the common ink reservoir 13 in parallel and independently.
The ink is not consumed sequentially from the two ink storage chambers, but the ink is uniformly consumed from each ink storage chamber. Therefore, the ink supply is stably performed from beginning to end.

Here, the filter 17 is provided to prevent air bubbles from being mixed when the ink in each of the ink storage chambers 14 moves to the common ink reservoir 13. The ink held by the porous member 15 is in a mixed state of ink and air, and the filter 17 allows only the ink to pass therethrough by the action of the surface tension of the ink itself, and prevents the bubbles from entering the common ink 13. I'm preventing. Next, the ejection states of the present application and the conventional example will be described in detail. In the case of the present application, the elements that cause resistance in ink supply are the porous member and the filter member in each ink storage chamber. In the example, it is a portion where the ink of the liquid supply member width exists. Further, the filter member used in the present application is knitted with a thin stainless steel wire as described later, and the gap between the thin wires is several μm to several tens μm, which cannot be ignored as well as the resistance of the porous member. Therefore, the resistance in the initial state in which the ink is full and the resistance after the ink has been consumed, for example, just half, are conventionally half the resistance value, but the present invention hardly changes. Therefore, stable ejection of ink becomes possible.

In the filter 17 portion, only the ink can be reliably guided from the porous member 15 by the action of the surface tension of the ink itself.
There is no air entering the interior 3. Figure 3 shows the situation at this time.
The color arrows in the ink storage chamber 14 shown in FIG.
Represents the magnitude of the ink impregnation rate in the porous member 15,
In the state where air and ink are mixed, an arrow is drawn toward a portion where the proportion of the ink is large. Here, as an example, it is assumed that a polyurethane member is used for the porous member and a stainless steel thin wire is used for the filter. It should be noted that, in the process of manufacturing the ink tank, when the polyurethane foam cut into a rectangular shape is inserted into the ink storage chamber 14, the polyurethane foam is kept in a uniform state so that the roughness of the eyes does not become uneven. It is necessary to insert in. If there is a difference in the coarseness of the eye in each part of the porous member 15, that is, a difference occurs in the capillary force acting on the part, and a relatively coarse part, that is, the capillary force is relatively small. Since the ink holding power is weak in the weak portion, the ink is consumed at the ink tip of this portion.

FIG. 4 is a diagram showing how ink is consumed when the insertion of the porous members (15a to 15f) in each ink storage chamber 14 is biased. For example, in the porous member 15c in the third ink storage chamber, the coarseness is close in the vicinity of the atmosphere communication hole 16 and the fifth member
The porous member 15f in the ink storage chamber is dense at both ends. For this reason, the manner in which the ink is consumed varies as shown in the direction of the arrow in the figure. In this case, as the consumption of ink progresses, for example, the ink remaining in the porous member 15c is separated from the ink in the common ink reservoir 13 and becomes isolated. In this case, the residual ink is no longer consumed any more, and the ink use efficiency of the entire ink tank 11 is significantly reduced. To avoid this, it is necessary to insert the porous member 15 into the ink chamber 14 without bias, as described above.

The present invention is characterized in that a plurality of ink storage chambers are provided, but this is for the following reasons. That is, the advantage of providing a plurality of ink storage chambers is that more ink can be stored therein, and arranging a large porous member without partitioning each ink storage chamber will be described later. As described in Example 4), a large amount of ink cannot be stored because ink leaks. Also, manufacturing a large porous member has a poor yield, and it is very difficult to insert a larger porous member into a box-shaped container such as an ink chamber in a uniform state. Further, by providing air communication holes in a plurality of ink storage chambers, even when a foreign substance or ink is clogged in one air communication hole, ink can be supplied from another ink storage chamber. There is an advantage that it is not impossible. In this case, a structure in which a plurality of air communication holes are provided in one ink storage chamber without partitioning the ink storage chamber is also conceivable. However, this is because a plurality of air inlets and outlets exist in a closed space. There are drawbacks such as improved air permeability and increased loss due to evaporation of the ink. As described above, according to the present invention, a plurality of ink storage chambers are provided, and one air communication hole is provided in each ink storage chamber.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG.

As described above, it is very important to prevent variations in the roughness of the eye when inserting the porous member. However, in the actual manufacturing of the ink tank, a rectangular parallelepiped shape that can be manufactured at the lowest cost is often adopted in the manufacturing process of the porous member, and the porous member formed into a rectangular parallelepiped is completely unbiased. It is very difficult to dispose them on the surface, and it is inevitable that the roughness of the eyes varies. In order to solve the problem, the second aspect of the present invention is now described.
An example will be described. FIG. 5 shows an embodiment of the present invention. The overall configuration of a recording apparatus on which the present invention is mounted and the internal structure of the ink tank 11 are substantially the same as those of the above-described first embodiment, and a description thereof will be omitted. Here, in the ink tank of the present invention, as shown in FIG. 5, the shape of the ink storage chamber 14 is narrow near the filter 17 and wide on the side of the air communication hole 16, and a rectangular parallelepiped porous member is contained therein. 15 is obtained. By doing so, the porous member is compressed in the vicinity of the filter 17, and the coarseness of the porous member is increased, so that the ink holding force in this portion is stronger than in other portions. Therefore, the ink is consumed in order from the air communication hole 16 side where the ink holding power is relatively weak, and the ink impregnated in each porous member 15 is always located at the position of the filter 17 as shown in FIG. And the ink in the common ink reservoir 13 is continuous, there is no isolated ink in the ink storage chamber 14, and the amount of remaining ink can be greatly reduced.

Here, the coarseness of the porous member will be described. The unit of the coarseness of the porous member is usually represented by the number of holes per inch. For example, 40 [ce
Between [ll / inch] and 50 [cell / inch], the eyes of "50 [cell / inch]" are "dense". Further, since an actual porous member is three-dimensional, it is necessary to define it in three dimensions (three directions). In the case of FIG. 5, the coarseness of the eyes becomes “dense” according to the direction of the arrow, but on the air communication hole side, X, Y, Z = 40, 120, 40.
[Cell / inch] (X is the vertical direction of the ink storage chamber, Y is the horizontal direction of the ink storage chamber, Z is the depth direction of the ink storage chamber), and X, Y, Z =
40, 160, 40 [cell / inch]. That is, by making the coarseness near the filter member "dense" than other portions (atmospheric communication hole side), the ink holding force is increased at the ink reservoir side (filter side) by the action of the capillary force. (The flow from the “sparse” air communication hole side of the eyes to the “dense” filter side of the eyes). Also, since the porous body is a continuous body, it does not suddenly become "coarse" with other parts,
Since the ink gradually changes, the ink in the ink chamber can be used continuously.

(Embodiment 3) Another embodiment of the present invention will be described with reference to FIG.

As in the second embodiment, the overall configuration of the recording apparatus and the internal structure of the ink tank 11 are substantially the same, and will not be described. Here, in the ink tank of the present invention, as shown in FIG. 6, the mounting portion of the filter 17 protrudes inside the ink storage chamber 14, and when the rectangular parallelepiped porous member 15 is inserted, the filter 17 is compressed. It is configured to be. Therefore, the ink holding force at this portion of the porous member 15 is stronger than at other portions, and
As in the second embodiment, the consumption of ink is performed in order from the air communication hole 16 side, and this method can also greatly reduce the amount of remaining ink.

(Embodiment 4) Another embodiment of the present invention is shown in FIGS.
This will be described with reference to FIG.

In this embodiment, in order to enable the ink tank to be used without causing ink leakage in an ink tank which can be used irrespective of the installation direction or a recording apparatus equipped with the ink tank, The ink storage chamber formed so that the length in the direction of does not exceed 5 cm,
A plurality of embodiments are provided with the same configuration as in the first embodiment, and contain recording ink.

FIG. 7 is a sectional view of an ink tank according to a fourth embodiment of the present invention. The structure is the same as that of FIG. 2 according to the first embodiment. For convenience of explanation of ink leakage, it is assumed that the air communication hole 16 is installed downward. As shown in the drawing, the size of each ink storage chamber does not exceed 5 cm on each side. Although not shown in the drawing, it is assumed that the dimension in the direction perpendicular to the paper is also set to a size corresponding to this. Here, since the height of the porous member 15 in each ink storage chamber 14 is 5 cm, the ink impregnated therein can be sufficiently retained. For this reason, even if the air communication hole 16 from which ink can leak out is located as shown in the figure, ink leakage does not occur, but the height dimension exceeds 5 cm as shown in FIG. In this case, the ink that cannot be retained inside the porous member 15 leaks to the outside from the air communication hole by that much.

FIG. 8 is a sectional view when the ink tank 11 of FIG. 7 is installed in another direction. In this case, the height of the entire ink tank 11 exceeds 5 cm, but the ink in each ink storage chamber 14 is held by each porous member 15, and the height direction of each porous member is Is within a range not exceeding 5 cm, so that the ink does not leak to the outside. In this case, the common ink reservoir 13 is used as ink not held by the porous member.
The reason why the ink does not leak to the outside, although there is ink inside, will be described below.

In the common ink reservoir 13 shown in FIG.
And the filter 17 only. Ink supply port 12
Is connected to the recording head 21 via the ink supply tube 4 as shown in FIG. 1, and communicates with the outside through the ink ejection port of the recording head. Therefore, the common ink reservoir 1
Reference numeral 3 denotes a space between both ends of the recording head between the ink ejection port of the recording head and the filter 17. Here, if it is assumed that the ink leaks from the common ink reservoir 13 to the outside, the same volume of ink or air should be supplemented into the space from the outside. However, the ink ejection openings of the recording head and a part of the filter located at both ends of the space have very small hole diameters and are always in contact with the ink. No ingress of air from the air occurs. Further, as a possibility that the ink may enter this portion, the ink in each of the ink storage chambers 14 may be considered. It cannot move unless ink is sucked out. Therefore, in a natural state, there is no possibility that ink or air enters the space from the outside, that is, the ink does not leak from the space to the outside.

Next, the size of each ink storage chamber is 5
The grounds for limiting the range not to exceed cm will be described in detail.

The average diameter of the pores constituting the porous member is D,
The contact angle between the porous member and the ink held by the porous member is θ,
If the surface tension of the ink is T, the specific gravity of the ink is ρ, the gravitational acceleration is g, and the height of the ink held by the porous member is h, the porous member is balanced by the capillary force and the weight of the ink. The range in which the capillary can hold ink is determined in the range where the following equation is satisfied, that is, when the capillary force is larger.

ΠDTcos> π (D / 2) ² ρgh Here, each value in the case of using a general water-based ink used as an ink jet system and a porous member made of polyurethane is as follows: D = 2 × 10 ⁻² [Cm], θ = 60 [°], T = 50
[Dyne / cm] ρ = 1.1 [g / cm ³ ] and g = 980 [cm / s ² ], and by substituting these, h ≦ 5 [c
m]. Therefore, the length of one side of the porous member is 5 cm.
If it is as follows, it is possible to hold the ink inside, and conversely, when using an ink storage chamber whose side length exceeds 5 cm, even if the porous member is disposed inside However, it is impossible to hold all the ink, and the remaining ink that is not held is very fluid, so that there is a great risk of leaking to the outside from the air communication hole or the like.

According to the present embodiment, it is possible to provide a recording apparatus which can be used without depending on the installation direction because ink does not leak, and this makes it possible to carry a portable recording apparatus. The device can be realized.

(Embodiment 5) FIG. 10 shows another embodiment of the present invention.
It will be described based on.

In this embodiment, in order to enable continuous use of the recording apparatus for a long period of time and to save the user's trouble in operating the recording apparatus by replenishing ink or the like.
By configuring a large ink tank as a whole with the same configuration as above, storing a large amount of ink in the ink tank in advance, by not replacing the ink tank part and replenishing the ink,
The recording device is of a disposable type.

The ink tank of this embodiment is provided with a plurality of ink storage chambers in the same manner as in the methods of the first to fourth embodiments, and a total of 300 c of usable ink is previously stored therein.
c. It is assumed that the above ink is stored. As a specific example, as shown in FIG. 10, the size of each ink storage chamber is set to 5 [cm] × 3 [cm] × 4 [cm] in the ink tank.
And nine of them are provided. This size is a range that can be carried around as a notebook-sized recording device. In this case, the total volume of the ink storage chamber is 540c.
c. Assuming that the proportion occupied by the ink is 70%, the ink amount is 378 cc. Becomes Further, 10% of the remaining ink is left unused and evaporated from the air communication hole and cannot be used, and the total amount of ink that can be used is 340 cc. Becomes

Next, the 340 cc. Calculate the print amount that can be recorded with the ink of the above. According to the results of the experiment, the average number of dots per alphanumeric character is 226 dots,
If 1500 characters are printed on a single sheet of paper,
The number of dots per sheet is 3.39 × 10 ⁵ dots. Further, the ink amount per dot is 6 × 10 ⁻⁸ cc. Therefore, 340 cc. The number of A4 sheets that can be recorded by is about 17,000 sheets. This means that if the recording device is used by an individual, it will last for about 10 years.
The usable ink amount is 300 cc. If the recording device can be accommodated as described above, the recording device can be made a disposable type.

According to the present embodiment, a large amount of ink is stored in the ink tank in advance, and the replacement of the ink tank unit and the replenishment of the ink tank from outside are not performed.
It is possible to eliminate the leakage of ink due to a mistake at the time of replacement and the trouble of replacement, and it is not necessary to provide an ink remaining amount detector that notifies the time of replacement or replenishment, so that considerable cost reduction can be expected, and It is possible to provide a recording device that is very easy for the user to handle. Furthermore, since the ink does not run out during use, continuous printing over a long period of time is possible, and a recording apparatus suitable for printing on roll paper or the like can be provided.

[0038]

According to the ink jet recording apparatus of the first aspect, in the ink tank having a plurality of ink storage chambers, the ink in each ink storage chamber is not consumed in order but consumed in each ink storage chamber. Uniform consumption is possible, and the fluctuation of the supply resistance is reduced from the initial state until the ink is used up, so that the ink discharge by the print head can be stabilized all the time, and the printing accuracy is good. An inkjet recording device can be provided.

According to the ink jet recording apparatus of the second aspect, in the ink tank filled with the porous member,
The amount of ink that remains in the porous member and cannot be used can be reduced, and the use efficiency of the ink is improved. Therefore, the size of the ink tank can be reduced. In addition, since the amount of ink that cannot be used and is discarded is reduced, the cost can be reduced accordingly, and an inexpensive ink jet recording apparatus with good printing accuracy can be provided.

According to the ink jet recording apparatus of the third aspect, since the cross-sectional area of the ink tank on the filter arrangement side is reduced, the porous member on the filter side is simply filled (pushed) with the columnar porous member. , The amount of ink remaining in the width of the porous member can be reduced, and an ink jet recording apparatus excellent in handling can be provided.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a recording apparatus according to the present invention.

FIG. 2 is a cross-sectional view of an ink storage unit according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a state of ink consumption in each ink storage unit in an ink tank.

FIG. 4 is a diagram illustrating an ink consumption state in a case where the filling of a porous member in each ink storage chamber varies.

FIG. 5 is a cross-sectional view of an ink container according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of an ink container according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of an ink container according to a fourth embodiment of the present invention.

FIG. 8 is a diagram illustrating that ink leakage occurs when the size of one side of the ink storage unit is large.

FIG. 9 is a diagram showing a state where the ink tank of the present invention is installed in another direction.

FIG. 10 is an overall perspective view of a recording apparatus showing a fifth embodiment of the present invention.

FIG. 11 is a sectional view of an ink tank section of a conventional device.

FIG. 12 is a diagram illustrating a state in which the remaining amount of ink in an ink tank of a conventional device is reduced.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording head 2 Carriage 3 Platen 4 Ink supply tube 11 Ink tank 12 Ink supply port 13 Common ink reservoir 14 Ink storage chamber 15 Porous body or fiber bundle 15a Porous body or fiber bundle 15b Porous body or fiber bundle 15c Porous Body or fiber bundle 15d Porous body or fiber bundle 15e Porous body or fiber bundle 15f Porous body or fiber bundle 16 Atmosphere communication hole 17 Filter 21a Ink storage room 21b Ink storage room 21c Ink storage room 21b Ink storage room 21e Ink storage Chamber 21f ink storage chamber 23 liquid supply member 24 atmosphere communication hole 25 supply port

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor ▲ Tsuru ▼ Yasushi Ii 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor ▲ Hisashi Murakami 22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka No. 22 Inside Sharp Corporation (72) Inventor Yoshio Kanayama 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) B41J 2/175

Claims (3)

(57) [Claims] A plurality of ink storage chambers each having an air communication hole and a filter portion, each of which is filled with a porous body or a fiber bundle impregnated with ink, and adjacent to the filter portion of each of the ink storage chambers. An ink jet recording apparatus having one common ink reservoir and one ink supply port provided in the ink reservoir, wherein ink is supplied from the common ink reservoir to the print head via the ink supply port. . 2. The method according to claim 1, wherein the pores of the porous body or the fiber bundle in the ink storage chamber are denser on the filter portion side than on the air communication hole side. Ink jet recording device. 3. The ink jet recording apparatus according to claim 1, wherein the shape of the ink storage chamber has a smaller cross-sectional area on the filter portion side than on the air communication hole side.