JPH10329329A - Ink cartridge for ink jet recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of ink and flow-in of the air surely. SOLUTION: A communication hole 26 is made through the bottom wall 17 of a body case 10 containing an ink holder 70 and an ink supply port 20 having a fitting part 21 projecting outward at the forward end thereof on the downstream side 15 provided integrally on the bottom wall 17 of the body case 10 such that the communication hole 26 communicates with the upstream side of a jet chamber 22 opening on the downstream side. The jet chamber 22 at the ink supply port 20 is fitted tightly with a tubular bottomed plug body 30 made of an elastic member and comprising a bottom wall and a fitting part 21. The ink supply port 20 fitted with the plug body 30 is fixed with a cap body 40 having a through hole 43 at a part corresponding to the central part of the bottom wall of the plug body 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink cartridge used in an ink jet recording apparatus such as an ink jet printer which performs recording by directly ejecting ink from an ejection nozzle provided in a recording head onto a recording medium such as recording paper.

[0002]

2. Description of the Related Art An ink jet recording apparatus typified by a printer supplies ink to a recording head provided with a large number of ejection nozzles mounted on a carriage and ejects ink directly onto a recording medium such as recording paper to perform recording. The ink is supplied to the recording head by a container (hereinafter, referred to as a cartridge) for storing ink, which is generally called a cartridge, which is detachable from the recording head and is replaceable. I have.

[0003] As this kind of cartridge,
(1) When the cartridge is mounted on the carriage, the ink supply needle can be reliably prevented from leaking from the outer peripheral portion of the ink supply needle when the ink supply needle is inserted into the ink supply port of the cartridge. (3) when the cartridge is mounted on the carriage, it is possible to reliably prevent air from entering into the holes, that is, the flow paths, of the ink supply needle when the ink supply needle is inserted into the ink supply needle. Various measures have been devised because it is necessary to ensure airtightness, and (4) it is necessary to easily and reliably store or fill ink in the cartridge.

For example, Japanese Patent Application Laid-Open No. Hei 5-270001 describes a cartridge intended to satisfy the above conditions (1) to (3). In the ink cartridge described in this publication, a porous body for ink absorption is housed in the ink cartridge with a filter interposed at the end of an ink outlet protruding from the bottom surface, and the end of the ink outlet is attached to a recording head. A packing member is provided for elastic contact with the outer periphery of the provided ink supply needle, and the opening at the leading end of the outlet is sealed with a seal through which the ink supply needle can penetrate. Penetrate the sealing material, seal the periphery of the penetrated ink supply needle with the packing, so as to communicate with the ink in the cartridge in a liquid honey state, without making the tip of the ink supply needle a sharp shape, In addition, when the ink cartridge is replaced, gas is prevented from entering the ink supply needle of the recording apparatus main body. Is obtained so as to hold the airtightness. However, in the above-mentioned publication, a fine mesh filter woven of stainless steel wire is fixed to the ink outlet by welding, and this filter is required and this fixing work is required. There is. Further, in the above-mentioned publication, a packing is provided in the vicinity of the opening of the ejection port so as to be in elastic contact with the outer periphery of the ink supply needle, and the opening at the tip of the ejection port is sealed with a sealing material. And a welding step are required.

[0005] As described above, the cartridge described in the above publication has a large number of parts, requires many operations or steps for attaching the cartridges, and has a problem that the productivity is low and the cost is high. This means that in an ink cartridge having a plurality of ink storage tanks or storage chambers used for performing color recording,
Workability is further degraded due to a smaller storage room.

In the ink cartridge described in the above publication, a filter is provided at the ink outlet because air that has entered from the recording head side enters the ink-absorbing porous body of the ink cartridge. The filter reacts with the ink to generate nitrogen gas with the passage of time, so that the filter is used to prevent air from entering the ink-absorbing porous body. However, in a commonly used ink cartridge, when the recording head is mounted in a state where ink can be supplied, the storage chamber in which the ink-absorbing porous body is stored is communicated with the atmosphere. Then, when the ink suction action is applied from the recording head side, the action of causing the ink to flow smoothly through the ink supply path to the recording head is due to the air pressure communicating with the atmosphere,
The air penetrates into the porous body impregnated with a large amount of ink, and it has been confirmed by the inventor that almost no nitrogen gas is generated in actual use without the filter.

In addition, ink is injected into the storage chamber of the cartridge, that is, while the porous body is stored in the storage chamber, the air in the storage chamber is degassed through a deaeration hole provided in the lid to make a negative pressure state. After the ink is injected from the holes to impregnate the porous body with the ink, the injection holes and the deaeration holes are sealed in a hermetically sealed state to prevent the leakage of the ink from the injection holes and the deaeration holes during a distribution process or the like. It must be prevented.

An example of an ink cartridge which prevents ink from leaking from the injection hole and the deaeration hole is described in, for example, JP-A-8-132635.
As shown in the detailed description of the invention and in FIGS. 4 and 5, the ink cartridge described in this publication is provided with a hole for ink injection in the lid, and the ink cartridge is provided on the upper surface of the lid. A meandering groove communicating with the hole for ink injection is provided, and the hole for ink injection is connected to the air communication port via this groove.When the ink injection operation is completed, the hole for ink injection and the air communication port are connected. A capillary tube is formed by attaching a covering seal, and a tongue protruding from the lid via a constricted portion is provided on the seal on the way to the air communication port, and the tongue is peeled off during use. In this way, the seal is cut from the constricted portion, and by this cut, the air communication port is opened to allow the ink injection hole to communicate with the air so that the ink flows out from the ink supply port.

By forming the meandering groove in this manner, even if ink flows out from the injection hole when the internal pressure of the ink chamber is increased or an external pressure is applied to the cartridge, the ink is stored in the long meandering groove. As the seal tongue is cut and peeled off, the air communication port communicates with the atmosphere at the moment when the tongue is cut off, and since the ink chamber is under negative pressure, it is stored in the groove. This ink has the advantage that it flows into the ink chamber due to the negative pressure and can be prevented from flowing out.

However, in this case, a single seal covering almost the entire upper surface of the lid must be adhered under reduced pressure, that is, in the decompression chamber of the decompression device. In addition, there is a problem that the flatness of the upper surface of the lid is required to be accurately adhered to the upper surface of the lid to ensure airtightness. Note that, without increasing the accuracy of the flatness of the upper surface of the lid, a pressing member that presses the seal against the upper surface of the lid at the time of sticking the seal has elasticity. Although it is conceivable to make the pressing member follow the upper surface, it is difficult to make the pressing member surely follow the upper surface having no flatness, and as a result, it is difficult to obtain reliable airtightness.

Another method for sealing the ink injection hole and the deaeration hole provided in the lid is to form a concave portion having a circular cross section with an open upper part on the upper surface of the lid and to form the concave portion. Forming a hole for ink injection and a hole for degassing on the bottom wall,
After injecting ink, a steel ball is press-fitted into the concave portion, and an adhesive is injected between the outer peripheral surface of the steel ball and the concave portion so as to be sealed. As a result, there is a problem that the ink overflows from the ink injection hole and the degassing hole due to the volume expansion of the ink stored in the storage chamber and breaks the sealed adhesive layer and flows out to the outside. .

[0012]

As described above, the structure for preventing ink leakage and ensuring airtightness when an ink supply needle is inserted into the ink supply port of a conventional ink cartridge has a large number of parts. However, there are problems such as low productivity, high cost, and the like, because of the complexity and the large number of assembly steps required.

In addition, the sealing process for the ink injection hole and the deaeration hole after the ink is injected into the ink storage chamber is performed by attaching a seal under reduced pressure in a reduced pressure chamber. Therefore, there is a problem that complicated and high-precision facilities, that is, devices are required, and productivity is not always satisfactory.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the invention according to claim 1 is formed in a box-like shape with a bottom opening at one end side, and has a storage chamber formed therein. A body case in which a communication hole is provided in a bottom wall of the storage chamber, and a body case provided integrally with the bottom wall of the body case;
An ink supply port having an engagement portion protruding outward from the bottom wall, the ink supply opening having an opening on the downstream side communicating the upstream side of the discharge chamber formed therein with the communication hole, and the storage chamber; An ink retainer formed of an open-cell foam that is stored in a compressed state and impregnated with ink therein; a lid that closes an opening of the main body case; and a lid on the side of the communication hole of the discharge chamber. An ink derivative formed of open-cell foam that is disposed at a location and guides the ink impregnated in the ink holding body to the ejection chamber; and a bottomed cylindrical shape formed of an elastic member and formed of a bottom wall and a cylindrical wall. And a plug body fitted with the cylindrical wall in close contact with the inner wall of the discharge chamber, a bottom wall having a through hole in a portion corresponding to the center of the plug body, and a bottom wall integrally provided with the bottom wall. It is formed in a bottomed cylindrical shape consisting of a cylindrical wall,
An ink cartridge for an ink jet recording apparatus, comprising: a cap attached to a fitting portion of the ink supply port in which the plug is fitted.

As described above, according to the first aspect of the present invention, a communication hole is formed in the bottom wall of the main body case for accommodating the ink holding member.
On the bottom wall of the main body case, an ink supply port having a fitting portion protruding outward from the bottom wall while having an opening on the downstream side with the upstream side of the discharge chamber communicating with the communication hole and the downstream side. It is provided integrally, and a cylindrical wall of a plug formed of an elastic member is fitted to the inner wall of the discharge chamber of the ink supply port in a close contact state, and at the ink supply port to which the plug is fitted, Since the cap body having the through-hole is attached to a portion corresponding to the center of the bottom wall of the stopper, ink leakage occurring through the outer peripheral surface of the ink supply needle inserted into the ink supply port can be reliably prevented. Further, it has the effect of ensuring airtightness between the outer peripheral surface of the ink supply needle and the plug. In addition, since the ink supply port is hermetically sealed by a plug fitted into the ink supply port and a cap that prevents the plug from being detached, the number of parts is small and the structure is simple. The assembly is performed by a simple process of fitting the plug and attaching the cap, which reduces the number of assembling steps and improves productivity. It has the function of maintaining the wearing state. Further, since the cap body is formed with a through hole, the cap body does not cause any obstacle at the time of insertion of the ink supply needle into the stopper body, and has an effect that the insertion is easy.

According to a second aspect of the present invention, in the first aspect of the present invention, the expansion ratio of the ink holding body housed in the housing chamber is 25% to 35%, and the peripheral surface near the communication hole is provided. An ink cartridge for an ink jet recording apparatus in which the area occupying the upper part of the ink cartridge is compressed to 50% to 65% of the volume in the free state.

According to a second aspect of the present invention, in the first aspect of the present invention, the expansion ratio of the ink holding member is set to 25% to 35%, and the communicating hole of the storage chamber in the ink holding member. The structure of the present invention is characterized in that the region occupying the upper part of the peripheral surface of the storage space is compressed to 50% to 65% of the volume in the free state. Since the communication state of the open cells of the ink holding body corresponding to the area can be improved, the supply of ink to the discharge chamber through the communication hole can be improved, and the area other than the area occupying the upper portion can be improved. Has an effect that the ink impregnation amount of the portion can be increased.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the ink holding body housed in the housing chamber is 45% to 8% of the volume in the free state.
This is an ink cartridge for an ink jet recording apparatus housed in a state compressed to 0%.

As described above, according to the third aspect of the present invention, in the first and second aspects of the present invention, the open-cell foam constituting the ink holding body housed in the housing chamber has a volume in a free state. Since it is configured to be housed in a state of being compressed to 45% to 80%, in addition to the operation of the invention according to claim 1 or 2, the communication state of the open cells of the ink holding body is reduced by the compression of the ink holding body. This has the effect that the ink supply to the discharge chamber can be made good through the communication hole because it can be made good.

According to a fourth aspect of the present invention, in accordance with the first to third aspects of the present invention, a plurality of ink holders housed in the storage chamber are stored in a stacked manner from the bottom wall of the storage chamber. This is an ink cartridge for an ink jet recording apparatus constituted by the foam of the above.

According to a fourth aspect of the present invention, there is provided a method as set forth in the first to third aspects, wherein the plurality of ink holders housed in the storage chamber are stacked and stored in order from the bottom wall of the storage chamber. In addition to the effects of the invention as set forth in claims 1 to 3, in addition to the effect of the invention according to claims 1 to 3, since the individual foams to be stored while being compressed in the storage chamber are small in volume, the storage operation is easy. It has the effect of becoming.

According to a fifth aspect of the present invention, there is provided the ink holding device according to the fourth aspect, wherein the foaming ratio of a plurality of foams stacked in the storage chamber in order from the bottom wall and located in the storage chamber is closest to the bottom wall. This is an ink cartridge for an ink jet recording apparatus having the largest body.

According to the fifth aspect of the present invention, in the fourth aspect of the present invention, the foaming ratio of a plurality of foams stacked in order from the bottom wall and stored in the storage chamber is the ink positioned at the most bottom wall. Since the holding member is the largest, in addition to the effect of the invention described in claim 4, there is an effect that the ink can be satisfactorily supplied to the ejection chamber through the communication hole provided in the bottom wall of the ink storage chamber. Things.

According to a sixth aspect of the present invention, in the first to fifth aspects, the diameter of the communication hole formed in the bottom wall of the main body case is 1.5 mm or more and 5.0 mm or more.
This is an ink cartridge for an ink jet recording apparatus having a diameter of millimeter or less.

According to a sixth aspect of the present invention, in the first to fifth aspects of the present invention, the diameter of the communication hole is set to 1.
Since the configuration is not less than 5 millimeters and not more than 5.0 millimeters, in addition to the effects of the inventions according to the first to fifth aspects, there is an effect that the inflow of ink from the communication hole into the discharge chamber can be improved. Things.

According to a seventh aspect of the present invention, in the first to sixth aspects of the present invention, the thickness of the bottom wall of the plug is such that the central portion of the bottom wall is thinner than other portions. This is an ink cartridge for an ink jet recording apparatus.

As described above, according to the invention of claim 7, the bottom wall of the plug has a structure in which the central portion of the bottom wall is made thinner than the other portions. In addition to the effect of the invention according to the sixth aspect, the thickness of the bottom wall is reduced to facilitate insertion of the ink supply needle, and since the insertion portion is reliably pierced at the time of insertion, ink leakage and air inflow are caused. Has the effect of reliably preventing

According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, the stopper body is in close contact with the edge surface of the opening of the ink supply port on the bottom wall side of the cylindrical wall. A bottom wall of the cap body is formed as an ink cartridge for an ink jet recording apparatus in which a flange portion is formed and the cap body is attached to the fitting portion of the ink supply port portion, and the bottom wall is in close contact with the flange portion.

Thus, the invention according to claim 8 is the invention according to claims 1 to 7, wherein the stopper is closely attached to the edge surface of the opening of the ink supply port on the bottom wall side of the cylindrical wall of the stopper. And a bottom wall of the cap body is brought into close contact with the flange portion in a state where the cap body is attached to the fitting portion of the ink supply port portion. In addition to the functions of the invention described above, the plug has an effect of enhancing the adhesion of the plug to the ink supply port and reliably preventing ink leakage and air inflow.

According to a ninth aspect of the present invention, in the first aspect of the present invention, an engaging portion is provided on one of the fitting portion of the ink supply port and the cylindrical wall of the cap body. On the other hand, an ink cartridge for an ink jet recording apparatus having an engaged portion to be engaged with the engaging portion is formed.

According to the ninth aspect of the present invention, in the first to eighth aspects of the present invention, the engaging portion is provided on one of the fitting portion of the ink supply port and the cylindrical wall of the cap body. Is formed on the other side with an engaged portion that engages with the engaging portion. Therefore, in addition to the operation of the invention according to claims 1 to 8, the cap body to the ink supply port portion is This has the effect that the attachment can be ensured and the detachment can be reliably prevented.

The invention according to claim 10 is the first invention.
In the invention described in the above, an ink cartridge for an ink jet recording apparatus is provided in which a plurality of storage chambers and an ink supply port are formed in parallel in a case main body, and each cap body attached to each of the ink supply ports is integrally connected. It is.

According to a tenth aspect of the present invention, in the first aspect of the invention, a plurality of storage chambers and an ink supply port are formed in parallel in the case main body, and each of the ink supply ports is provided in the case main body. Since the attached cap bodies are integrally connected, the cap body can be easily attached to the ink supply port in addition to the function of the first aspect of the present invention.

[0034] The invention described in claim 11 is the first invention.
The invention according to claim 10, wherein an ink injection hole and a deaeration hole are provided at a portion corresponding to the storage chamber in a lid body with an opening of the case main body closed, and ink is stored in the ink holding body stored in the storage chamber. After that, the ink injection hole and the deaeration hole are welded by ultrasonic welding to a sealing body made of the same material as the lid, thereby forming an ink cartridge for an ink jet recording apparatus.

As described above, according to the eleventh aspect of the present invention, in the first to tenth aspects of the present invention, an ink injection hole is provided at a portion corresponding to the storage chamber in the cover body with the opening of the case body closed. After providing the deaeration hole and injecting the ink into the ink holder housed in the storage chamber, the sealing member made of the same material as the lid was welded to the ink injection hole and the deaeration hole by ultrasonic welding. From claim 1
In addition to the effects of the invention described in the tenth aspect, the ink injection holes and the deaeration holes can be easily sealed.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the cartridge 1 includes a main body case 10, a lid 50 attached to the main body case 10, an ink holder 70 housed in the main body case 10, and a main body case 1.
The cap 30 includes a plug 30 and a cap 40 that are attached to the ink supply port 20 provided in the printer.

Next, each of these components will be described. The main body case 10 is made of a synthetic resin, and is formed in a box shape with a substantially rectangular bottom with an opening 11 at the top, and a partition wall 1 formed inside along the longitudinal direction.
2 and a partition wall 1 formed in a direction orthogonal to the partition wall 12
3 and three storage chambers 14a to 14c for storing the ink holding bodies 70 described later in detail.
And storage chambers 15a to 15c for storing ink corresponding to the three storage chambers 14a to 14c, respectively.
Is provided. The storage chambers 14a to 14a
c and the storage chamber 1 corresponding to the storage chambers 14a to 14c
5a to 15c are the main body case 1 of the partition wall 13.
0 through the through holes 13a provided on the bottom side of the storage chambers 15a through 15a.
c stored in the storage chambers 14a to 14c.
It is designed to flow into.

The bottom wall 16 of each of the storage chambers 15a to 15c comprises an inclined wall 16a and a vertical wall 16b provided perpendicularly to the inclined wall 16a.
Through 14c.

As shown in FIG. 3, a portion of each of the storage chambers 14a to 14c deviated to one end side (opposite to the storage chambers 15a to 15c) from the longitudinal center of the bottom wall 17 as shown in FIG. A projecting portion 17a projecting into the storage chambers 14a and 14b and having a flat upper surface.
Are formed.

One end of the protruding portion 17a from the center in the longitudinal direction (the side opposite to the storage chambers 15a to 15c).
The outer surface of the bottom wall 17 corresponding to the portion deviated to
An ink supply port 20 is formed integrally with the bottom wall 17 with its tip protruding from the outer surface. The protruding portion of the ink supply port portion 20 protruding from the outer side surface of the bottom wall 17 is formed in a cylindrical shape, and the peripheral wall is formed with a concave groove 21a (see FIG. 4) as an annular engaging portion. A first space portion 22a having a circular cross section with a small diameter in the upward direction, that is, on the side of the protruding portion 17a, and the first space portion 2 are provided inside the ink supply port portion 20.
A second space portion 22b having an opening 23 at the bottom and a cross section formed in a large diameter in a section connected to the second space portion 2a is formed. A step portion 24 is formed at a boundary portion between the second space portion 22b. The first space 22a and the second space 2
2b constitutes the ejection chamber 22 of the ink supply port 20. Further, the first space portion 22a and each of the storage chambers 14 to 14c communicate with each other through the projecting portion 17a, that is, a communication hole 26 provided in the bottom wall 17.

Next, the plug 30 attached to the second space 22b of the ink supply port 20 will be described. The plug body 30 is made of an elastic material such as rubber, and has an annular wall 31 and a bottom wall 32 provided at the bottom of the annular wall 31 as shown in FIG.
And an annular flange portion 34 formed at the end of the bottomed cylindrical portion 33 on the bottom wall 32 side. The plug 30 is formed by connecting the outer peripheral surface of the annular wall 31 to the ink supply port 2.
0, that is, the second space 22b is fitted in close contact with the inner peripheral wall of the second space 22b and the upper surface of the flange 34 is brought into close contact with the end face of the opening 23 of the second space 22b. It is attached to. The bottom wall 32 is formed to have a smaller thickness at its central portion, that is, at a portion where the tip of the ink supply needle 65 is pierced, than at other portions so that the bottom wall 32 can be easily pierced by a tip portion of the ink supply needle 65 described later. Is what it is. This means that not only metal but also synthetic resin is used as the material of the ink supply needle 65.
Since the tip is not sharp, for example, when the cartridge 1 is mounted on the mounting portion 60 of the recording head mounted on the carriage in a case where the ink jet recording apparatus is a printer, the thickness of the bottom wall 32 of the plug 30 is reduced. If the bottom wall 32 is too thick, the bottom wall 32 cannot be easily pierced and thus cannot be easily mounted. In addition, the bottom wall 32 must be extremely thin in view of the above circumstances. It is difficult to make the thickness extremely uniform and extremely thin. For example, when the thickness of the portion other than the center portion is formed to be smaller than the thickness of the center portion due to manufacturing variations or the like, the ink supply needle 65
When the center portion of the wall thickness is pressed by the tip of the wall, a crack is formed in the thin wall portion without being pierced by the center portion, and the crack is induced in the thin wall portion, so that the center portion is protruded. The ink supply needle 65 is torn from the bottom wall 32 to the ejection chamber 22.
Will be inserted into. For this reason, the adhesion between the outer peripheral surface of the ink supply needle 65 and the through hole formed by the ink supply needle 65 in the bottom wall 32 due to the crack is impaired, and ink leakage and air in the ejection chamber 22 are lost. Occurs. However, as described above, the bottom wall 32
The thickness of the central portion of the ink supply needle 65 is made thinner than the thickness of the other portions, so that the tip of the ink supply needle 65 can be reliably connected to the bottom wall 32.
Of the ink supply needle 65, the edge of the through hole of the pierced bottom wall 32 comes into close contact with the outer peripheral surface of the ink supply needle 65. The inflow of air into the chamber 22 can be reliably prevented. According to the confirmation of the inventor, with respect to various ink supply needles used in a general ink jet printer, when the material of the plug 30 is made of silicone rubber, although there is a difference depending on the hardness of the plug 30, It has been confirmed that it is desirable that the central portion of the bottom wall 32 has a thickness of about 0.2 mm to 0.5 mm from the viewpoint of easy insertion and close contact.

The annular wall 31 of the plug 30 fitted in the second space 22b located on the downstream side of the discharge chamber 22
Of the inner circumference of the first space portion 22a located on the upstream side
Is set to be larger than the diameter of the discharge chamber 22, that is, by making the cross-sectional area of the space on the downstream side of the discharge chamber 22 larger than the cross-sectional area of the space on the upstream side, the discharge chamber 22 has a damper function. Accordingly, even if a positive pressure is applied from the recording head due to any circumstances, it is possible to prevent the ink stored in the discharge chamber 22 from flowing backward from the communication hole 26 to the storage chambers 14a to 14c.

The size of the communication hole 26 depends on the size of the storage chamber 14.
It is desirable that the diameter of the discharge chamber 22 should be large to some extent in order to allow the discharge chamber 22 to flow into the discharge chamber 22 satisfactorily, and it is desirable that the diameter be small in order to prevent backflow. Although there is a point depending on the size of the internal volume of the discharge chamber 22, the internal volume of
The inventor has confirmed that when the diameter is about 0 to 300 cubic millimeters, the diameter of the communication hole 26 is preferably about 1.5 to 5.0 millimeters.

Next, the cap 40 attached to the fitting portion 21 of the ink supply port 20 will be described.
As shown in FIGS. 2 to 4, the cap 40 has an annular wall 41, a bottom wall 42 provided on the annular wall 41, and is formed in a bottomed cylindrical shape having an upper opening.
Reference numeral 2 denotes a through-hole 43 having a central portion corresponding to a central portion of the bottom wall 32 of the plug body 30 having a small thickness. On the inner peripheral surface of the annular wall 41, an annular convex portion 44 is formed as an engaged portion that fits into the annular concave groove 21a formed on the outer peripheral surface of the fitting portion 21. By fitting the convex portion 44 into the concave groove 21a,
The cap body 40 is adapted to be attached to the fitting part 21, and in the attached state, the flange part 34 of the plug body 30 is connected to the bottom wall 42 and the opening 2 of the second space 22 b.
3 between the flange 34 and the opening edge of the opening 23 of the second space 22b in a compressed state, thereby enhancing the adhesion between the flange 34 and the opening edge of the opening 23 of the second space 22b. The prevention of air from flowing into the discharge chamber is further enhanced.

Next, the storage chamber 14 of the main body case 10 will be described.
The ink holder 70 housed in each of a to c will be described. The ink holding member 70 is formed of an open-cell foam, the outer shape of which is formed in a rectangular parallelepiped shape, and the volume in a natural state where no compressive force is applied, that is, in a free state, is the content of the storage chambers 14a to 14c. It is set to be larger than the product, and is stored in a compressed state in the storage chambers 14a to 14c. The compression of the ink holding body 70 is performed by bringing open cells formed therein close to each other to improve the communication state and obtaining a good ink flow inside the foam through the open cells. Is desirably increased to some extent, and in order to increase the amount of ink impregnation, it is desirable that the compression ratio be lower. When the compression ratio is the reciprocal of the foaming density in the free state, and the foaming ratio is about 30 times the foam, when obtaining a good ink flow in the foam and a satisfactory ink impregnation amount, It was confirmed by actual measurement by the inventor that the compression ratio of the ink holding member 70 is desirably about 45 to 85%.

The upper surface of the projecting portion 17a formed on the bottom wall 17 of the ink holder 70 housed in the housing chambers 14a to 14c, that is, the peripheral surface near the communication hole 26 is the bottom surface. The region above the bottom surface, that is, the portion occupying the region above the peripheral surface in the vicinity of the communication hole 26, is compressed by the protruding portion 17 to have a higher foaming ratio than other portions, that is, the expansion ratio. This communication hole 2
By making the expansion ratio of the ink holding member 70 occupying the upper region of the peripheral surface near 6 larger than that of the other portions, the open cells in this portion communicate better, so that the ink impregnated in other portions is Can be satisfactorily guided to the communication hole 26.

When the expansion ratio, which is the reciprocal of the expansion density, is about 30 times, the ink holder 70 occupying the upper region of the peripheral surface near the communication hole 26 has a volume of 50% of the volume in the free state. It was confirmed that the ink impregnated in other portions of the ink holding member 70 can be favorably guided to the communication holes 26 when compressed to about 65%.

The communication hole 26 provided in the projecting portion 17a is provided so as to be deviated to one end side, that is, the side opposite to the storage chambers 15a to 15c, in other words, the upper surface of the projecting portion 17a is Since the storage chambers 15a to 15c extend rearward, the storage chambers 15a to 15c
The ink supplied to the ink holding member 70 from the storage chambers 15a to 15c is more effectively guided to the communication hole 26 because many portions having the large expansion ratio are formed on the c side.

In the first space 22a of the ink supply port 20, a columnar ink derivative 71 made of an open-cell foam is accommodated.
The device functions to introduce the ink guided from the ink holding member 70 to the communication hole 26 into the discharge chamber of the ink supply 20. The ink derivative 71 also has a function of preventing the ink stored in the discharge chamber 22 from flowing back to the storage chambers 14a to 14c through the communication holes 26.

Next, the lid 50 for closing the opening 11 of the main body case 10 will be described. The lid 50 is made of a synthetic resin and is formed in a rectangular shape as shown in FIG. 2, and is formed on the upper surface corresponding to each of the storage chambers 14a to 14c of the main body case 10 as shown in FIG. Is formed with a large-diameter concave portion 51, and a small-diameter concave portion 51a is formed in the bottom wall of the concave portion 51.
An ink inlet 51b is formed on the bottom wall of the ink jet printer. Further, a large-diameter concave portion 52 is formed adjacent to each of the large-diameter concave portions 51, and a small-diameter concave portion 52a is formed on the bottom wall of the concave portion 52. Is formed with a deaeration port 52b. Atmospheric communication holes 53 are formed adjacent to the large-diameter concave portions 52, respectively.

The lower surface of the lid 50, that is, the storage chamber 1
As shown in FIG. 3, rib-like projections 54a to 54d projecting into the respective storage chambers 14a to 14c are provided on the surfaces on the side of 4a to 14c. When it is welded to the case 10 by ultrasonic welding and attached with the opening 11 closed, the ink holding body 70 housed in the housing chambers 14 to 14c is compressed. Each of the air communication holes 53 is surrounded by a U-shaped rib 55 having a height lower than that of the projections 54a to 54d.

The large-diameter concave portion 51 and the small-diameter concave portion 51a are formed of a synthetic resin of the same material as that of the lid 50, and are fitted into the small-diameter concave portion 51a.
and a sealing body 56 having a T-shaped cross section, comprising a flange portion 56b provided in the fitting portion 56a and located in the large-diameter concave portion 51.
To be sealed. This seal 56
After the ink injection is completed, the fitting portion 56a is fitted into the small-diameter concave portion 51a and the flange portion 56a
The lower surface of b is attached to the bottom wall of the large-diameter concave portion 51 by being welded by ultrasonic welding to seal the ink injection port 51b, and this sealing process is performed in the air. Therefore, the sealing device may be an ultrasonic welding machine, and the sealing process is performed in the atmosphere, so that the operation is easy.

Similarly, the large-diameter concave portion 52 and the small-diameter concave portion 52a are formed of a synthetic resin of the same material as that of the lid 50, and are fitted to the small-diameter concave portion 52a. And a sealing member 57 having a T-shaped cross section and formed of a flange portion 57b provided in the large-diameter concave portion 52 provided in the fitting portion 57a. After the ink has been injected similarly to the sealing body 56, the sealing body 57 is fitted with the fitting portion 57a into the small-diameter concave portion 52a and the lower surface of the flange portion 57b is connected to the large-diameter concave portion 5a.
2 is welded and attached to the bottom wall by ultrasonic welding,
The deaeration port 52b is sealed, and this sealing process is performed in the atmosphere using a long-wave welding machine as in the case of the sealing body 56, and the operation is easy.

The air communication hole 53 is sealed by heat welding with a label (not shown) at the time of ink injection. When the air communication hole 53 is mounted on the mounting portion 60 of the recording head, the label is peeled off and the storage chamber is removed. 14a to 14c are communicated with the atmosphere. The air communication hole 53 may be hermetically sealed at the time of ink injection by providing a sealing means in the ink injection device and maintaining the airtightness by sealing with the sealing means.

A guide projection 58 is formed at each corner of the lower surface of the lid 50, and the guide projection 58 is
0 is attached to the opening 11 of the main body case 10,
Since the guide is guided by the peripheral wall of each corner of the opening 11, the positioning of the lid 50 to the opening 11 is facilitated.

Next, the assembly of the cartridge 1 will be described. First, the ink derivative 71 is housed in the first space 22a, which is a part of the discharge chamber of the ink supply port 20, and then the plug 30 is attached to the annular wall 3 thereof.
1 is press-fitted and attached to the inner peripheral wall of the second space 22b, which is a part of the discharge chamber 22, and then the cap body 4
0 is fitted and fitted to the fitting portion 21 of the ink supply port 20. The cap body 40 is connected to the ink supply port 20.
In the state of being fitted to the fitting portion 21, the convex portion 44 of the cap body 40 is fitted and securely attached to the concave groove 21 a formed in the fitting portion 21. Is brought into close contact with the bottom wall 42 of the cap body 40 and the ink supply port 20, that is, the opening edge surface of the opening 23 of the second space 22b.

Next, the ink holder 70 is inserted into and stored in the respective storage chambers 14a and 14b from the opening 11 in a compressed state. Then, the opening 11 is closed by the lid 50 and the peripheral portion thereof is closed. Is welded by an ultrasonic welding machine. The atmosphere communication hole 53 is sealed by attaching a level not shown.

Injecting the ink into the cartridge 1 in this state is performed by the storage chambers 14a to 14c and the storage chamber 1a.
Ink of a predetermined color (in this case, three colors of magenta, cyan, and yellow) is sequentially injected into 5a to 15c. First, the storage chamber 14a and the storage chamber 15a corresponding to the storage chamber 14a have predetermined colors (for example, Magenta) ink. This injection is performed by a measuring tube (not shown) at the ink injection port 51a corresponding to the storage chamber 14a.
An ink injection nozzle connected via an injection switching valve provided downstream of the measuring pipe is inserted in a sealed state, and an exhaust pump (not shown), which is also not shown, is inserted into a deaeration port 52a corresponding to the storage chamber 14a. A deaeration nozzle connected via an exhaust switching valve is inserted downstream of the pump in a sealed state (note that the ink injection nozzle is inserted into the injection port 51a and the deaeration nozzle is inserted into the deaeration port 52a). Then, the injection switching valve is closed, the exhaust switching valve is opened, degassing is performed by the exhaust pump, and the pressure in the storage chamber 14a and the storage chamber 15a is reduced to a predetermined negative pressure value. When the negative pressure value is reached, the exhaust switching valve is closed, and then the injection switching valve is opened, and the storage chamber 14a and the storage chamber 1 are opened.
Since the inside of the measuring chamber 5a has a negative pressure, a predetermined amount of ink stored in the measuring tube is sucked by the negative pressure, and the ink holder 7 stored in the storing chamber 14a is sucked.
And impregnated into the storage chamber 15a.

The injection of the three colors of ink into the cartridge 1 may be performed simultaneously. In the same manner, the other colors of ink are injected into the storage chambers 14b and 15b, and the storage chambers 14c and 15c. After the completion of the ink injection, the injection port 51b and the deaeration port 52b are sealed with the sealing bodies 56 and 57 as described above. Since the sealing process of the sealing body 56 and the sealing body 57 is performed by the ultrasonic welding machine in the atmosphere as described above, it is extremely compared with the sealing operation performed under reduced pressure as in the conventional case. It is easy and does not require equipment or the like for reducing the atmosphere under reduced pressure.

As shown in FIG. 5, the cartridge 1 into which the ink has been injected is mounted on a mounting portion 60 of a recording head (not shown) and used. This mounting part 6
Reference numeral 0 denotes a base 61 and an ink supply needle 65 protruding from the base 61 as shown in the figure. The ink supply needle 65 is provided on the recording head (not shown) via a flow path tube (not shown). The ink is supplied to the ejected nozzle. The ink supply needle 65 is formed in a rod shape having a circular cross section, and has a flow path 65a formed therein in the axial direction. The tip of the ink supply needle 65 is formed in a conical shape. Is formed with a through hole 65b communicating with the flow path 65a.

The supply unit 60 of the cartridge 1
First, the label (not shown) stuck on the upper surface of the lid 50 is peeled off to release the atmosphere communication hole 53 to allow the storage chambers 14a to 14c to communicate with the atmosphere. The tip of the ink supply needle 65 is connected to the plug 30 through the through hole 43 of the cap 40 attached to the ink supply port 20 of the main body case 10.
When the cartridge 1 is pressed against the ink supply needle 65 after the central portion of the bottom wall 32 is pressed, the tip of the ink supply needle 65 breaks through the thin portion of the bottom wall 32, The tip is the discharge chamber 22, that is, the first space 2
2a, and penetrates into the ink derivative 71 stored in the first space 22a, and the through hole 65a
1 will be located inside.

Then, the ink supply needle 65 is connected to the stopper 30.
When the bottom wall 32 is pierced and inserted into the discharge chamber 22 as shown in FIG. 5, the hole edge surface 32 a of the through hole formed by piercing the bottom wall 32 as shown in FIG. Because it adheres to the surface by its elastic force,
Ink leakage and air inflow into the ejection chamber 22 are reliably prevented, and air can be prevented from flowing out to the ejection nozzle via the ink supply needle 65. Since the thickness of the central portion of the bottom wall 32 is set to be smaller than the thickness of the surrounding portion, the bottom wall 32 can be easily pierced by the tip of the ink supply needle 65 and the peripheral portion having a large thickness is formed. No crack occurs in the portion, and the airtightness of the outer peripheral surface between the hole edge surface 32a of the through hole formed by the ink supply needle 65 and the ink supply needle 65 due to the crack is impaired. As described above, since there is no
Numeral 2a surely adheres to the outer peripheral surface of the ink supply needle 65. Further, since the thickness of the peripheral portion of the central portion is large, the elastic force of the peripheral portion 32a of the through-hole makes the ink supply needle 6
Since it acts so as to be in pressure contact with the outer peripheral surface of 5, the adhesion is further enhanced.

The cartridge 1 is mounted on the mounting portion 60 to perform recording. During the recording operation, ink is ejected from the ejection nozzles, so that the inside of the flow path tube (not shown) becomes negative pressure. The ink guided by the ink derivative 71 through the communication hole 26 provided in the protruding portion 17a of the storage chambers 14a to 14c is ejected through the through hole 65b, the flow path 65a, and a flow path pipe (not shown). The recording medium is reliably supplied to the nozzles and is recorded on a recording medium such as recording paper.

In the above embodiment, the ink holder is formed of one foam, but this foam is inserted into the storage chambers 14a to 14c while being compressed as a whole. Therefore, when formed as a single piece, it is difficult to insert the foamed body due to its large volume.
4c may be formed of a plurality of foams laminated sequentially from the bottom wall 17 toward the opening 11 side.

In the case where the ink holding member is formed of a plurality of foams as described above, the foaming ratio of the foam located on the bottom wall 17, that is, on the side of the communication hole 26, is large.
By decreasing the size toward the opening side, the flow of ink toward the communication hole 26 can be improved.

In the above embodiment, the plug 3
In FIG. 6, the flange 34 is provided. However, as shown in FIG. 6, the flange 34 may be omitted. There is an advantage that the amount can be reduced. However, when the collar portion 34 is provided, as described above, ink leakage prevention,
This has the advantage that air can be prevented from flowing into the discharge chamber 22.

Further, in the above embodiment, in order to attach the cap body 40 to the ink supply port 20, the ink supply port 20 is provided with the annular concave groove 21a as an engaging portion, and the cap body 40 is covered. An annular convex portion 4 as an engaging portion
4, the two are engaged with each other. As shown in FIG. 7, for example, as shown in FIG. An engagement portion is formed by a plurality of protrusions 121a having an inclined surface 121b and an upper surface formed as a flat surface 121c, and a plurality of engagements formed on the annular wall 41 of the cap body 40 corresponding to the protrusions 121a. Hole 144
Thus, the engaged portion may be formed so that both are engaged. In this case, the cap body 40
When attaching to the fitting portion 21, the edge of the annular wall 41 of the cap body 40 is lifted up while being pushed and spread along the inclined surface 121b and climbs over the tip of the projection 121a, and at the same time, the projection 121a is engaged with the engagement hole 144. In addition, since the upper surface of the projection 121a is formed on the flat surface 121c at the time of the engagement, the hole edge of the engaging hole 144 is securely engaged with the flat surface 121c and easily comes off. There is no one.

Further, the cap body 40 is connected to the ink supply port 2.
As another method of attaching to the main body case 10, a plurality of fitting holes 221 are formed around the fitting portion 21 in the bottom wall 17 of the main body case 10 as shown in FIG. 41 is a fitting projection 2 that is press-fitted into the fitting hole 221.
44, and the fitting protrusion 244 is fitted to the fitting hole 221.
It is also possible to adopt a configuration in which the components are press-fitted and attached to the device.

Further, in the above-described embodiment, three separate cap bodies 40 are attached to the three ink supply ports 20, however, for example, as shown in FIG. It is also possible to form a through-hole 43 corresponding to the plug 30 fitted into the ink supply port 20, and to form a single cap body 440 by integrating the three cap bodies 40 as described above. In the case of the configuration, since the number of the cap bodies is reduced, the mounting operation becomes easy. When the cap body 440 is formed into one cap body 440 as described above, the cap body 440 is attached to the fitting sections 21 of the ink supply port sections 20 located on both sides as shown in FIG. Protrusions 121a (only one is shown in FIG. 9) may be provided, and an engaging hole 144 may be provided as an engaged portion corresponding to the protrusion 121a, and these may be engaged and attached. It should be noted that the configuration for attaching the cap body 440 to the ink supply port portion 20 can of course adopt other configurations as described above corresponding to the specific design.

In the above embodiment, three storage chambers 14a to 14c are used because three inks are used.
However, the number of ink cartridges is not limited to three. When one color ink is used, a single storage chamber can be used. When three or more color inks are used, these cartridges can be used. The cartridge may be provided with a number of storage chambers corresponding to the number of ink colors.

In the above embodiment, the storage chambers 15a corresponding to the storage chambers 14a to 14c respectively.
Although the configuration in which the storage chambers 15a to 15c are provided is adopted, it is not always necessary to provide the storage chambers 15a to 15c.

[0072]

As described above, according to the first aspect of the present invention, a communication hole is formed in the bottom wall of the main body case for accommodating the ink holding member, and the upstream side of the discharge chamber is formed in the bottom wall of the main body case. An ink supply port having a fitting portion that communicates with the communication hole and has an opening on the downstream side and protrudes outward from the bottom wall on the downstream side, and is integrally provided with an inner wall of a discharge chamber of the ink supply port; A cylindrical wall of a plug formed of an elastic member is fitted to the ink supply port where the plug is fitted, and a through hole is formed in a portion corresponding to the center of the bottom wall of the plug. With the configuration in which the cap body is attached, it is possible to reliably prevent ink leakage that occurs through the outer peripheral surface of the ink supply needle inserted into the ink supply port portion, and to prevent the ink from leaking between the outer peripheral surface of the ink supply needle and the plug. Has the effect of ensuring the airtightness of Than it is. In addition, since the ink supply port is hermetically sealed by a plug fitted into the ink supply port and a cap that prevents the plug from being detached, the number of parts is small and the structure is simple. The assembly is performed by a simple process of fitting the plug and attaching the cap, which reduces the number of assembling steps and improves productivity. This has the effect of maintaining the wearing state. Further, since the cap body has a through-hole, the cap body does not cause any obstacle at the time of insertion of the ink supply needle into the stopper body, and has an effect that the insertion is easy.

According to a second aspect of the present invention, in the first aspect of the invention, the expansion ratio of the ink holding member is set to 25.
% To 35%, and the area of the ink holding body occupying the upper part of the peripheral surface near the communication hole of the storage chamber is compressed to 50% to 65% of the volume in the free state. Item 1 In addition to the effect of the invention described in Item 1, since the communicating state of the communicating bubbles of the ink holding body in the portion occupying the upper region of the peripheral surface near the communicating hole of the storage chamber can be improved, it can be connected to the discharge chamber via the communicating hole. In addition, it is possible to improve the supply of the ink and to increase the amount of ink impregnated in portions other than the portion occupying the upper region.

The third aspect of the present invention is the first aspect of the present invention.
According to the second aspect of the present invention, since the open-cell foam constituting the ink holding body housed in the housing chamber is housed in a state compressed to 45% to 80% of the volume in the free state, In addition to the effects of the first and second aspects of the present invention, since the communication state of the open cells of the ink holding member can be improved by the compression of the ink holding member, the supply of the ink to the ejection chamber through the communication hole is improved. It has the effect of being able to be.

According to a fourth aspect of the present invention, in accordance with the first to third aspects of the present invention, a plurality of ink holding bodies housed in the storage chamber are stacked and stored in order from the bottom wall of the storage chamber. Claim 1 because it is made of a foam.
In addition to the effects of the third aspect of the present invention, since each foam to be stored while being compressed in the storage chamber has a small volume, it has an effect of facilitating the storage operation.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the foaming ratio of a plurality of foams stacked in order from the bottom wall and housed in the storage chamber is the foaming ratio which is positioned at the bottom wall. Is maximized, so that in addition to the effect of the invention described in claim 4, there is an effect that the ink can be favorably supplied to the ejection chamber through the communication hole provided in the bottom wall of the ink storage chamber. is there.

According to a sixth aspect of the present invention, in the first to fifth aspects, the diameter of the communication hole is set to 1.
Since the configuration is not less than 5 millimeters and not more than 5.0 millimeters, in addition to the effects of the respective inventions according to claims 1 to 5, an effect that the ink can be favorably flowed into the discharge chamber from the communication hole. It has.

According to a seventh aspect of the present invention, in the first to sixth aspects of the invention, the thickness of the bottom wall of the plug is made thinner at the central portion of the bottom wall than at other portions. With this configuration, in addition to the effects of the inventions described in claims 1 to 6, the thickness of the bottom wall is reduced to facilitate the insertion of the ink supply needle, and the insertion portion is surely inserted at the time of insertion. This has the effect of reliably preventing ink leakage and inflow of air from being pierced.

According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, in the first to seventh aspects, an ink is provided on the bottom wall side of the cylindrical wall of the plug. A configuration in which a flange portion is formed so as to be in close contact with the edge surface of the opening of the supply port portion, and the bottom wall of the cap body is in close contact with the flange portion in a state where the cap body is attached to the fitting portion of the ink supply port portion. Therefore, in addition to the effects of the first to seventh aspects, the present invention has the effect of enhancing the adhesion of the plug to the ink supply port and reliably preventing ink leakage and air inflow. .

According to a ninth aspect of the present invention, in the first to eighth aspects, an engaging portion is provided on one of the fitting portion of the ink supply port and the cylindrical wall of the cap body. Since the engaged portion that engages with the engaging portion is formed on the other side, in addition to the effects of the invention according to claims 1 to 8, the cap body is attached to the ink supply port. And the separation can be reliably prevented.

The invention according to claim 10 is the same as the invention according to claim 1.
2. The invention according to claim 1, wherein the plurality of storage chambers and the ink supply ports are formed in parallel in the case main body, and the cap bodies attached to the ink supply ports are integrally connected. In addition to the effects described above, there is an effect that the cap body can be easily attached to the ink supply port.

The invention according to claim 11 is the first invention.
The invention according to claim 10, wherein an ink injection hole and a deaeration hole are provided at a portion corresponding to the storage chamber in a lid body with an opening of the case main body closed, and ink is stored in the ink holding body stored in the storage chamber. After the ink is injected, the sealing member made of the same material as the lid is welded to the ink injection hole and the deaeration hole by ultrasonic welding, so that in addition to the effects of the invention according to claims 1 to 10, This has the effect that the sealing process of the ink injection hole and the deaeration hole can be facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view of an ink cartridge according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the ink cartridge (X-
X-ray section).

FIG. 3 is an exploded perspective view of the ink cartridge.

FIG. 4 is a cross-sectional view of an ink supply port of the ink cartridge.

FIG. 5 is a cross-sectional view illustrating a relationship between an ink supply port of the ink cartridge and a mounting portion of a recording head.

FIG. 6 is a sectional view showing another embodiment of the plug of the ink cartridge.

FIG. 7 is a cross-sectional view showing another embodiment showing an attachment relationship between a cap body and an ink supply port of the ink cartridge.

FIG. 8 is a cross-sectional view showing still another embodiment showing the mounting relationship between the cap body and the ink supply port of the ink cartridge.

FIG. 9 is a perspective view showing another embodiment of the cap body of the ink cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink cartridge 10 Main body case 14a-14c Storage chamber 17 Main body case bottom wall 20 Ink supply port 21 Fitting part 21a Depressed groove (engagement part) 22 Discharge chamber 26 Communication hole provided in main body case bottom wall 30 Plug 32 Plug Body bottom wall 40 Cap body 43 Through hole provided in cap body 44 Convex part (engaged part) provided in cap body 70 Ink holding body

Claims (11)

[Claims] 1. A main body case which is formed in a box shape with a bottom opening at one end side and has a storage chamber formed therein and a communication hole provided in a bottom wall of the storage chamber, and a bottom wall of the main body case. Integrally provided with an opening on the downstream side with the upstream side of the discharge chamber formed therein communicating with the communication hole,
An ink supply port having a fitting portion protruding outward from the bottom wall on the downstream side, and an ink constituted by an open-cell foam that is stored in the storage chamber in a compressed state and impregnated with the ink therein. A retainer, a lid for closing an opening of the main body case, and foaming of open cells arranged at a portion of the discharge chamber on the communication hole side to guide ink impregnated in the ink retainer to the discharge chamber. A plug body formed of an elastic member, formed of an elastic member, formed into a bottomed cylindrical shape having a bottom wall and a cylindrical wall, and the cylindrical wall being fitted in close contact with the inner wall of the discharge chamber; An ink supply port formed in a bottomed cylindrical shape having a bottom wall having a through hole at a position corresponding to the center of the plug and a cylindrical wall provided integrally with the bottom wall, wherein the plug is fitted; And a cap attached to the fitting part of the part. Kujetto recording device for the ink cartridge. 2. The ink holding body accommodated in the accommodation chamber has a foaming ratio of 25% to 35%, and a region occupying an upper part of a peripheral surface in the vicinity of the communication hole is 50% to 65% of a volume in a free state. 2. The ink cartridge for an ink jet recording apparatus according to claim 1, wherein the ink cartridge is compressed to%. 3. The ink container according to claim 1, wherein the ink holding member housed in the housing chamber is housed in a state where the ink holding member is compressed to 45% to 80% of a volume in a free state.
The ink cartridge for an ink jet recording apparatus according to the above. 4. An ink holding body stored in the storage chamber,
4. The ink cartridge for an ink jet recording apparatus according to claim 1, wherein the ink cartridge is constituted by a plurality of foams which are sequentially stacked and stored from the bottom wall of the storage chamber. 5. The ink-jet printer according to claim 4, wherein the foaming ratio of the plurality of foams stacked in the storage chamber in order from the bottom wall is the largest for the ink holding member located at the bottom wall. Ink cartridge for recording device. 6. The ink jet recording apparatus according to claim 1, wherein a diameter of a communication hole formed in a bottom wall of the main body case is not less than 1.5 mm and not more than 5.0 mm. ink cartridge. 7. The ink jet recording apparatus according to claim 1, wherein a thickness of a bottom wall of the plug body is smaller at a central portion of the bottom wall than at other portions. ink cartridge. 8. A stopper which is formed on the bottom wall side of the cylindrical wall of the plug body so as to be in close contact with an edge surface of an opening of an ink supply port, and wherein the cap is fitted to a fitting portion of the ink supply port. 8. The ink cartridge for an ink jet recording apparatus according to claim 1, wherein a bottom wall of the cap body is in close contact with the flange when the cap body is attached. 9. An engaging portion is formed on one of the fitting portion of the ink supply port portion and the cylindrical wall of the cap body, and an engaged portion is formed on the other of the engaging portion and the engaging portion. 9. The ink cartridge for an ink jet recording apparatus according to claim 1, wherein: 10. The apparatus according to claim 1, wherein a plurality of storage chambers and an ink supply port are formed in the case body in parallel, and respective cap bodies attached to the respective ink supply ports are integrally connected. The ink cartridge for an ink jet recording apparatus according to the above. 11. An ink injection hole and a deaeration hole are provided in a portion corresponding to the storage chamber in a cover body in which an opening of the case body is closed, and ink is injected into an ink holder stored in the storage chamber. 11. The ink cartridge for an ink jet recording apparatus according to claim 1, wherein the sealing member made of the same material as the lid is welded to the ink injection hole and the deaeration hole by ultrasonic welding.