JPH09141887A - Ink tank of inkjet recording device - Google Patents

Abstract

(57) Abstract: A negative pressure generating member is housed in contact with an atmosphere communication section that is provided with an ink supply port that supplies ink to an inkjet recording head and an atmosphere communication port that communicates with the atmosphere. Has a first storage chamber, a space in which the ink is directly stored in a substantially sealed state, and a minute communication portion for supplying ink to the first storage chamber, and the minute communication portion is separated from the atmosphere communication portion of the first storage chamber. (EN) An ink tank having a second storage chamber provided at a different position, which does not cause ink leakage and has good storage stability regardless of the attitude difference. SOLUTION: An ink damming wall 18 for damming ink overflowing from a porous body 6 which is a negative pressure generating member when an environmental change occurs with the second storage chamber 9 facing up is first housed. It was provided between the atmosphere communication port 8 of the chamber 5 and the porous body 6. Due to this, the overflowed ink does not reach the atmosphere communication port 8 and does not leak.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet recording apparatus, and more particularly to an ink tank containing an ink absorber that holds ink to be supplied to an inkjet recording head.

[0002]

2. Description of the Related Art Recording devices such as thermal transfer, LBP, dot impact and ink jet are used as output devices for personal computer terminals, copying machines, FAX machines and the like. In this,
The inkjet method has been attracting attention as a printing method with excellent quietness. Among them, the method utilizing foaming of a liquid by heating is easy to achieve high density, excellent in quietness, and easy to colorize. It has excellent features such as high speed printing, and is attracting attention as a high-quality and inexpensive printing method.

An ink jet cartridge has a form in which an ink jet recording head and an ink tank are integrated and an ink absorber is housed in the ink tank. This type of cartridge is often discarded together with the head when the ink in the cartridge cannot be ejected. The amount of ink remaining in the cartridge at this stage is relatively large, even if improvements are made, due to the ink holding capacity of the sponge, which is a negative pressure generator housed almost entirely in the cartridge. Had been lost.

An ink container of this type is disclosed in Japanese Patent Application Laid-Open No. 63-63.
The ink container disclosed in Japanese Patent No. 87242 can be mentioned. That is, the foam material is placed in the ink container,
It is an ink jet recording head integrated cartridge having a plurality of ink ejection orifices. In this ink container, in order to store the ink in a porous medium such as polyurethane foam, which is a foam material, it is necessary to generate a negative pressure due to the capillary force of the polyurethane foam and retain the ink (prevent ink leakage from the ink container). However, since the polyurethane foam is required almost all in the ink storage layer, the filling amount of the ink is limited, and the amount of ink that remains unused in the polyurethane foam increases, and the ink usage efficiency increases. There was a problem that was bad. In addition, it is difficult to detect the remaining amount of ink, and the negative pressure gradually changes during the ink consumption period, which makes it difficult to maintain a substantially constant negative pressure.

To solve this problem, there is a publication that discloses a cartridge that employs a configuration in which the ink jet cartridge substantially holds only the ink. That is, in Japanese Patent Laid-Open No. 2-522, an ink jet in which a small amount of a porous member is arranged between a primary ink storage section located above and holding a large amount of ink only and an ink jet recording head located below. An inkjet cartridge integrated with a recording head is disclosed. According to the present invention, the use efficiency of the ink can be improved by disposing the porous member only in the ink flow path without incorporating it in the ink storage section. Further, by providing the secondary ink storage portion as a space capable of holding ink on the side of the porous member, the primary ink storage portion due to the expansion of the air in the primary ink storage portion due to the temperature increase or the pressure decrease. It is said that the ink flowing out from the printer can be stored and the negative pressure on the recording head during recording can be kept substantially constant.

However, according to the invention of this publication, when not recording, the porous member is impregnated with the ink from the primary ink storage portion which is located above and holds a large amount of ink so much that the ink is too large. Therefore, the generation of negative pressure in the porous member itself is almost eliminated. Therefore, there is a problem that the ink leaks from the orifice of the inkjet recording head with a slight impact.

Therefore, as a solution to this problem, there is provided a first storage chamber having an ink supply port for supplying ink to the ink jet recording head and an atmosphere communication portion communicating with the atmosphere and accommodating a porous body which is a negative pressure generating member. And for communicating with the first storage chamber via only the minute communication portion provided at a position distant from the atmosphere communication portion, but for supplying to the first storage chamber via the minute communication portion in a substantially sealed state. Second to store ink directly
An inkjet cartridge having a storage chamber has been proposed. According to this configuration, not only the efficiency of using the ink is greatly improved, but also the negative pressure can be made substantially constant over most of the period of use from the initial stage of use of the inkjet cartridge to the end stage of its use.

FIG. 5 is a schematic sectional view of the conventional ink jet cartridge proposed above. In the figure, 501 is an ink jet recording head, 501A is an ink ejection port, 5
Reference numeral 02 denotes an ink tank portion, 503 denotes an ink tank portion 502.
Of the container body, 504 is a partition wall that divides the container body 503 into two chambers, 505 is a first storage chamber that is one of the two chambers, and 506 is a porous body that is a negative pressure generating member. 5
Reference numeral 07 is an ink supply port to the inkjet recording head 501, 508 is an atmosphere communication port, and 509 is one of the two chambers.
The second storage chamber 510, which is one, is an ink filling port 510A.
Is a ball, 511 is a minute communication part, 513 is a holding part of a porous body which is a negative pressure generating member, and 515 is an atmosphere communication part.

In FIG. 5, the first storage chamber 505 accommodates the porous body 506 which is a negative pressure generating member, and also the ink supply port 507 to the ink jet recording head 501 and the holding portion of the porous body which is a negative pressure generating member. 513 and atmosphere communication unit 5
15 and an atmosphere communication port 508. Second storage room 509
Is an ink supply chamber that is directly filled with ink.
When the ink is filled, the ink is injected from the ink filling port 510, and after the ink is filled, the ball 510A closes the second storage chamber 509. Also, the partition wall 5
04, the ink is replenished from the second storage chamber 509 to the first storage chamber 505 through the minute communication portion 511 provided near the end portion on the ink supply port 507 side, and the replenished ink is of an elastic porous body. It is kept in a state of being absorbed by the porous body 506 which is a negative pressure generating member.

In the thus constructed ink jet cartridge, ink is supplied from the first storage chamber 505 through the ink supply port 507 as the ink is ejected from the ink ejection port 501A of the ink jet recording head 501 as an ink droplet. It Further, in the first storage chamber 505, the porous body 506, which is a negative pressure generating member, is kept at a negative pressure, so that the second storage chamber 50 is passed through the minute communication portion 511.
Ink is replenished from 9 to the first storage chamber 505.
Since the second storage chamber 509 fully stores the ink as it is, it is possible to continue replenishing the ink in the first storage chamber 505 until the second storage chamber 509 runs out of ink.

[0011]

However, in the conventional ink jet cartridge constructed as described above, the negative pressure generating member is formed of a porous material such as polyurethane foam, and the negative pressure is generated by utilizing the capillary force thereof. The ink-jet cartridge is placed in various orientations during physical distribution and is exposed to environmental changes such as temperature changes, vibrations, shocks, and atmospheric pressure changes. As shown in FIG. 5, the second storage chamber 509 has the minute communication portion 5
There was a problem when the ink jet cartridge was placed so as to occupy the position above 11.

That is, when the ink jet cartridge is left in such a posture, expansion and contraction of air in the second storage chamber and solidification of ink due to changes in environment,
Due to the volume change due to liquefaction, the ink in the second storage chamber moves to the negative pressure generating member, and the ink that cannot be absorbed by the negative pressure generating member accumulates in the atmosphere communicating portion, and negative pressure is generated in the downward printing that is normally used. There is a problem in that it does not happen or ink leaks from the atmosphere communication port to the outside.

FIG. 6 is a schematic sectional view showing a state of a conventional ink jet cartridge due to environmental changes. FIG.
6A shows the initial state, FIG. 6B shows the ink movement state after the heat cycle, and FIG. 6C shows the state when the heat cycle is further performed from the state of FIG. 6B.
In the figure, 501 is an inkjet recording head, 501A is an ink ejection port, 502 is an ink tank part, 503 is a container body of the ink tank part 502, 504 is a partition wall dividing the container body 503 into two chambers, and 505 is 2 One of the two chambers is a first storage chamber, 506 is a porous body that is a negative pressure generating member, and 507 is an inkjet recording head 501.
Ink supply port, 508 is an atmosphere communication port, 509 is a second storage chamber which is one of two chambers, 510 is an ink filling port, 510A is a ball, 511 is a minute communication part, 513
Is a holding portion of the porous body which is a negative pressure generating member, 515 is an atmosphere communicating portion, 521 is an initial air state in the second storage chamber 509, and 521 'is an initial air state 52 in the second storage chamber 509.
The state of air grown from 1 is 521 "is the second storage chamber 50
The state of air 522 'further growing from the state of air 521' inside 522, 522a ', 522a "is the ink 522b', 522 overflowing from the porous body 506 due to the growth of air.
b ″ is the porous body 506 when the second storage chamber 509 is turned up.
The ink is collected in the atmosphere communication portion 515 located below the lower surface of the ink.

The cause of the above problem will be described below with reference to FIGS. 6 (a), 6 (b) and 6 (c). FIG. 6A shows an initial state immediately after the ink injection, and shows an initial air state 521 in the second storage chamber 509. 6 (b) is 6
The state of the inkjet cartridge in the state of 60 ° C. after the heat cycle of 0 ° C. to −30 ° C. is repeated several times is shown, and the state of the air 521 ′ that has grown from the initial air state 521 in the second storage chamber 509, the air The ink 522a ′ overflowing from the porous body 506 due to the growth of the ink and the ink 522b ′ accumulated in the atmosphere communicating portion 515 located below the lower surface of the porous body 506 when the second storage chamber 509 is raised are shown. There is. When returning to normal temperature (about 25 ° C) from this state,
Due to the contraction of the air in the grown air state 521 ', the overflowing ink 522a' is absorbed by the porous body 506, but the ink 522b 'accumulated in the atmosphere communicating portion 515 cannot return and remains as it is.

FIG. 6C shows the state of the ink jet cartridge in the state of 60 ° C. after repeating the above heat cycle several times from the state of FIG. 6B, and shows the air state in the second storage chamber 509. The state of air 521 ″ that has further grown from 521 ′, the ink 522a ″ that has overflowed from the porous body 506 due to the growth of air, and the atmosphere that is below the lower surface of the porous body 506 when the second storage chamber 509 is up. Ink 522b ″ accumulated in the communicating portion 515 is shown. When the temperature returns to room temperature (about 25 ° C.) from this state, the ink 5 overflowing due to the contraction of the air in the state 521 ″ of the grown air 5
22a ″ is absorbed by the porous body 506, but the ink 522b ″ accumulated in the atmosphere communicating portion 515 cannot return and remains as it is. By repeating such a process, the water level of the overflowed ink exceeds the atmosphere communication port 508 and causes ink leakage.

This phenomenon described above is particularly caused by the second storage chamber 509.
When a large amount of air is present in the inside, the volume change due to the expansion and contraction of the air due to the environmental change is large, so that the above phenomenon becomes more remarkable and ink leakage to the outside easily occurs.

An object of the present invention is to accommodate a negative pressure generating member in contact with an atmosphere communication portion which is provided with an ink supply port for supplying ink to an ink jet recording head and an atmosphere communication port which communicates with the atmosphere. Has a first storage chamber, a space in which the ink is directly stored in a substantially sealed state, and a minute communication portion for supplying ink to the first storage chamber, and the minute communication portion is separated from the atmosphere communication portion of the first storage chamber. It is an object of the present invention to provide an ink tank having a second storage chamber provided at a different position, which does not cause ink leakage regardless of the attitude difference and has good storage stability.

[0018]

An ink tank of an ink jet recording apparatus according to the present invention includes an ink supply port for supplying ink to an ink jet recording head and an atmosphere communication port communicating with the atmosphere, and an atmosphere communicating with the atmosphere communication port. A minute communication section having a first storage chamber that is in contact with the communication section and stores the negative pressure generating member, a space in a substantially sealed state that directly stores ink, and a minute communication section for supplying ink to the first storage chamber Is an ink tank of an ink jet recording apparatus having a second storage chamber provided at a position away from the atmospheric communication portion of the first storage chamber, the atmospheric communication port of the first storage chamber and a negative pressure generating member. A wall for blocking the ink is provided between the walls.

Further, an ink damming wall may be provided except for the surface on which the minute communication portion is provided.

Further, an opening is formed on almost one end surface,
And an integral container in which a first storage chamber is formed in contact with the surface opposite to the opening and a second storage chamber is formed in contact with the opening, and an ink supply port provided on the surface opposite to the opening of the container, The atmosphere communication port, the negative pressure generating member housed in the first storage chamber of the container through the opening, and the negative pressure generating member that is housed in close contact with each other and facing the surface opposite to the opening of the container. A partition member that is joined to a predetermined position inside to partition the first storage chamber and the second storage chamber and that has a minute communication portion at a position that substantially faces the ink supply port and an opening that is bonded to the opening portion of the container An ink damming wall that includes a lid member that closes the container and that separates the atmosphere communication port and the negative pressure generating member may be integrally formed on the container side.

The ink damming wall provided to separate the atmosphere communication port and the negative pressure generating member can dam the ink overflowing from the negative pressure generating member. In addition, it does not cause ink leakage and has good storage stability.

[0022]

Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of an inkjet cartridge body in which the inkjet recording head and the ink tank of the embodiment are integrated. In the figure, 1 is an inkjet recording head, 1A is an ink ejection port, 2 is an ink tank part, 3 is a container body of the ink tank part 2, 3A is a lid member, and 4 is a partition that divides the container body 3 into two chambers. A wall, 5 is a first storage chamber which is one of the two chambers, 6 is a porous body which is a negative pressure generating member, 7 is an ink supply port to the inkjet recording head 1, 8 is an atmosphere communication port, and 9 Is a second storage chamber which is one of the two chambers, 10 is an ink filling port, 10A is a ball, 11 is a minute communication portion, 13 is a porous body pressing portion which is a negative pressure generating member, and 15 is the atmosphere. The communication portion 18 is an ink damming wall.

In FIG. 1, the first storage chamber 5 accommodates the porous body 6 which is a negative pressure generating member, and the ink supply port 7 to the ink jet recording head 1 and the holding portion of the porous body which is a negative pressure generating member. 13, an atmosphere communication portion 15, an atmosphere communication port 8, and an ink damming wall 18 to the atmosphere communication port 8. The second storage chamber 9 is an ink supply chamber that is directly filled with ink. When filling the ink, the ink filling port 1
Ink is injected from 0, and after filling ink, ball 1
The second storage chamber 9 is sealed by 0A. Further, ink is replenished from the second storage chamber 9 to the first storage chamber 5 via the minute communication portion 11 provided near the end of the partition wall 4 on the ink supply port 7 side, and the replenished ink is elastic. It is kept in a state of being absorbed by the porous body 6 which is a negative pressure generating member of the porous body.

In the first embodiment of the present invention, in the ink jet cartridge having the atmosphere communicating portion 15 having a portion located below the lower surface of the porous body 6 when the second storage chamber 9 is turned up, (2) An ink damming wall 18 for damming the ink overflowing from the porous body 6 when an environmental change occurs with the storage chamber 9 facing upward is provided. The ink overflowed by this is not always accumulated in the portion of the atmosphere communicating portion 15 below the lower surface of the porous body 6 and is always in contact with the porous body 6, so that when the environment returns to the original state,
The overflowing ink is absorbed by the porous body 6.

Although the present embodiment has been described with respect to the ink jet cartridge in which the ink jet recording head and the ink tank are integrated, it is naturally applicable to a mode in which the ink jet recording head and the ink tank are separated.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of the inkjet cartridge body of the embodiment of FIG. In the figure, 201 is an inkjet recording head, 201A is an ink ejection port, 202 is an ink tank portion, 203 is a container body of the ink tank portion 202, and 203.
A is a lid member, 204 is a partition wall that divides the container body 203 into two chambers, 205 is a first storage chamber that is one of the two chambers, and 206 is a porous body that is a negative pressure generating member. Two
Reference numeral 07 is an ink supply port to the inkjet recording head 201, 208 is an atmosphere communication port, and 209 is one of the two chambers.
The second storage chamber, which is one, 210 is an ink filling port, 210A
Is a ball, 211 is a minute communication part, 213 is a holding part of a porous body which is a negative pressure generating member, 215 is an atmosphere communication part, 218
Is an ink dam wall.

In FIG. 2, the first storage chamber 205 accommodates the porous body 206 which is a negative pressure generating member, and the ink supply port 207 to the ink jet recording head 201 and the holding portion of the porous body which is a negative pressure generating member. 213 and atmosphere communication unit 2
15, an atmosphere communication port 208, and an ink damming wall 218 to the atmosphere communication port 208. The second storage chamber 209 is an ink supply chamber that is directly filled with ink. When the ink is filled, the ink is injected from the ink filling port 210, and after the ink is filled, the second storage chamber 209 is sealed by the ball 210A. Further, the minute communication portion 2 provided near the end of the partition wall 204 on the ink supply port 207 side.
Ink is replenished from the second storage chamber 209 to the first storage chamber 205 via 11, and the replenished ink is kept in a state of being absorbed by the porous body 206 which is the negative pressure generating member of the elastic porous body. Be drunk

In the second embodiment of the present invention, in the ink jet cartridge having the atmosphere communicating portion 215 which has no portion located below the lower surface of the porous body 206 when the second storage chamber 209 is raised, Second storage room 2
Porous body 2 when an environmental change occurs with 09 being up
An ink blocking wall 218 for blocking the ink overflowing from 06 is provided. The ink overflowed by this,
The ink does not leak because it is blocked by the ink blocking wall 218 without reaching the atmosphere communication port 208, and because it is always in contact with the porous body 206, it overflows when the environment returns to the original state. The ejected ink is the porous body 206.
Is absorbed by

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of the inkjet cartridge body of the embodiment of FIG. In the figure, 301 is an ink jet recording head, 301A is an ink ejection port, 302 is an ink tank portion, 303 is a container body of the ink tank portion 302, and 303
B is a translucent lid member, 304 is a partition wall that divides the container body 303 into two chambers, 305 is a first storage chamber that is one of the two chambers, and 306 is a negative pressure generating member. A porous body, 307 is an ink supply port to the inkjet recording head 301, 308 is an atmosphere communication port, 309 is a second storage chamber which is one of the two chambers, 310 is an ink filling port, 3
10A is a ball, 311 is a minute communication part, 313 is a holding part of a porous body which is a negative pressure generating member, 315 is an atmosphere communication part,
Reference numeral 318 is an ink damming wall, and 320 is a reflecting plate.

In FIG. 3, the first storage chamber 305 accommodates the porous body 306, which is a negative pressure generating member, and the ink supply port 307 to the ink jet recording head 301, and the porous body pressing portion, which is the negative pressure generating member. 313 and atmosphere communication unit 3
15, an atmosphere communication port 308, and an ink damming wall 318 to the atmosphere communication port 308. The second storage chamber 309 is an ink supply chamber that is directly filled with ink. When the ink is filled, the ink is injected from the ink filling port 310, and after the ink is filled, the second storage chamber 309 is sealed by the ball 310A. Further, the minute communication portion 3 provided near the end of the partition wall 304 on the ink supply port 307 side.
Ink is replenished from the second storage chamber 309 to the first storage chamber 305 via 11, and the replenished ink is kept in a state of being absorbed by the porous body 306 which is a negative pressure generating member of the elastic porous body. Be drunk

In the third embodiment of the present invention, ink is blocked by the ink blocking wall 318, and the presence or absence of ink is detected by the partition wall 304 that divides the container body 303 into two chambers. The reflection plate 320 of is provided.
Although not shown here, an optical sensor including a light emitting element and a light receiving element is provided on, for example, a carriage on the recording device (printer) side, and when the ink in the second storage chamber 309 is used up, the light emitting element emits light. The light-transmitted light is guided into the second storage chamber 309 via the light-transmissive lid member 303B, further reflected by the reflection plate 320 and received by the light-receiving element, whereby the ink-free state is detected. .

In this embodiment, the second storage chamber 309
Although the reflection plate 320 is provided inside the second storage chamber 309, the presence or absence of ink in the second storage chamber 309 (whether the remaining ink amount is equal to or less than a predetermined amount) is detected by the reflection type optical sensor, but the reflection plate 320 is not provided. It is also possible to use a known one that detects the presence or absence of ink by a translucent optical sensor.

Furthermore, at least a pair of electrodes is provided near the bottom of the second storage chamber 309, and as long as ink is present, electrical conduction can be obtained between the pair of electrodes. Because it changes
You may make it detect that there is no ink.

Next, an example of the construction of an ink jet recording apparatus for carrying out recording by mounting the ink jet cartridge according to the present invention will be described. FIG. 4 is a schematic perspective view of an inkjet recording apparatus that carries out recording by mounting an inkjet cartridge according to the present invention.

In the figure, 400 is a sheet 414 which is a recording material.
A platen capable of feeding a sheet, 401 is an inkjet cartridge, 402 is a sheet retainer that holds the sheet 414 between the platen 400, 403 is a guide shaft that guides the carriage 411 along the sheet, 404 is a lead screw, and 405 is a carriage. A spiral groove that is screwed into 411, 406 is a pin provided on the carriage 411, 407 and 408 are home position detecting means composed of photocouplers, 409 and 410 are gears, 411 is a carriage,
412 is a lever for starting the suction recovery operation, 413
Is a drive motor, 414 is a sheet, 415 is a cap suction means, 416 is a cap member, 417 is a cleaning blade, 418 is a support of the cap suction means 415, 4
Reference numeral 20 is a cam, 422 is a cap support member, and 423 is an opening of the cap support member.

The lead screw 404 is the carriage 41.
It has a spiral groove 405 screwed into 1 and is rotationally driven by a drive motor 413. The gears 409 and 410 apply the driving force generated by the forward and reverse rotations of the drive motor 413 to the lead screw 40.
Communicate to 4. The carriage 411 moves in the directions of arrows a and b, and when the carriage 411 moves to the positions of the home position detecting means 407 and 408 made of photocouplers, the pin 406 provided on the carriage 411 makes the home made of photocouplers. Position detection means 407
And 408, the rotation direction of the drive motor 413 is switched.

The cap suction means 415 is the cap member 4
16 and can move in a direction orthogonal to the moving direction of the carriage 411 at this position together with the cleaning blade 417. The cam 420 engages with the movement of the carriage 411, and the recovery means starts suction. Get involved. It should be noted that the series of moving operations during the recovery operation are performed by the switching operation of the clutch mechanism, and
The driving force of No. 3 is used. The opening 423 of the cap support member has a peripheral portion in close contact with the ink ejection surface of the recording head of the ink jet cartridge during suction of the recovery operation. Further, the lever 412 for starting the suction recovery operation moves with the movement of the cam 420 that engages with the carriage 411, and transmits the driving force of the driving motor 413. The capping, cleaning, and suction recovery are configured such that when the carriage 411 reaches the home position side area, desired processing can be performed at the corresponding positions by the action of the lead screw 404, and at known timings. The operation may be performed as desired, and is applicable to this embodiment.

[0039]

As described above, the ink tank of the present invention is provided with the ink supply port for supplying the ink to the ink jet recording head and the atmosphere communication port communicating with the atmosphere, and the atmosphere communication section communicating with the atmosphere communication port. The first communication chamber, which is in contact with the negative pressure generating member, has a substantially hermetically sealed space for directly storing the ink, and a minute communication portion for supplying the ink to the first storage chamber. A second storage chamber provided at a position distant from the atmosphere communication portion of the storage chamber, the ink overflowing from the negative pressure generating member between the atmosphere communication port of the first storage chamber and the negative pressure generating member. Since we set up a barrier,
There is an effect that it is possible to provide an inkjet cartridge having an ink tank with a simple structure, which does not cause ink leakage regardless of the attitude difference and has good storage stability.

Further, by servicing such an ink tank, it is possible to provide an ink jet recording apparatus which can stably supply ink from the ink tank to the ink jet recording head.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an inkjet cartridge body according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of an inkjet cartridge body according to a second embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of an inkjet cartridge body according to a third embodiment of the present invention.

FIG. 4 is a schematic perspective view of an inkjet recording apparatus for recording by mounting an inkjet cartridge according to the present invention.

FIG. 5 is a schematic cross-sectional view of a conventional inkjet cartridge.

FIG. 6 is a schematic cross-sectional view showing a state of a conventional inkjet cartridge due to environmental changes. (A) A schematic cross-sectional view showing an initial state. (B) A schematic cross-sectional view showing a movement state of the ink after the heat cycle. It is a typical sectional view showing a state when a heat cycle is further performed from the state of (c) and (b).

[Explanation of symbols]

1, 201, 301, 501 Inkjet recording head 1A, 201A, 301A, 501A Ink ejection port 2, 202, 302, 502 Ink tank part 3, 203, 303, 503 Container body of ink tank part 3A, 203A Lid member 4, 204, 304, 504 Partition wall dividing the container body into two chambers 5, 205, 305, 505 First storage chamber which is one of the two chambers 6, 206, 306, 506 Negative pressure generating member Porous body 7, 207, 307, 507 Ink supply port to ink jet recording head 8, 208, 308, 508 Atmosphere communication port 9, 209, 309, 509 Second storage which is one of two chambers Chamber 10, 210, 310, 510 Ink filling port 10A, 210A, 310A, 510A Ball 11, 211, 31 511 Micro communication part 13, 213, 313, 513 Holding part of porous body which is negative pressure generating member 15, 215, 315, 515 Atmosphere communication part 18, 218, 318 Ink damming wall 303B Light transmissive lid member 320 Reflector 400 Platen capable of feeding a recording material sheet 401 Inkjet cartridge 402 Sheet retainer that holds the sheet between the platen 403 Guide shaft that guides the carriage along the sheet 404 Lead screw 405 Screw to the carriage Spiral groove 406 Pins 407 and 408 provided on the carriage Home position detection means 409 and 410 Gear 411 Carriage 412 Lever for starting suction recovery operation 413 Drive motor 414 Sheet 415 Cap suction means 41 Cap member 417 Cleaning blade 418 Support for cap suction means 420 Cam 422 Cap support member 423 Opening of cap support member 521 Initial air condition in second storage chamber 521 'Air grown from initial air condition in second storage chamber State 521 "state of air in the second storage chamber 521 'state of air that has grown further 522a', 522a" ink 522b ', 522b "that has overflowed from the porous body due to the growth of air. Ink that collects in the atmosphere communication section located below the lower surface of the porous body

Claims (3)

[Claims] 1. A first pressure accommodating member which is provided with an ink supply port for supplying ink to an ink jet recording head and an atmosphere communication port communicating with the atmosphere, and which is in contact with an atmosphere communication unit communicating with the atmosphere communication port. An accommodating chamber, a substantially hermetically sealed space for directly accommodating ink, and a minute communicating portion for supplying ink to the first accommodating chamber, the minute communicating portion from the atmosphere communicating portion of the first accommodating chamber. An ink tank of an inkjet recording apparatus having a second storage chamber provided at a distant position, wherein the ink is blocked between the atmosphere communication port of the first storage chamber and the negative pressure generating member. An ink tank for an inkjet recording apparatus, which is provided with a wall. 2. The ink tank of the ink jet recording apparatus according to claim 1, wherein the ink damming wall is provided except the surface on which the minute communication portion is provided. tank. 3. The ink tank of the ink jet recording apparatus according to claim 1 or 2, wherein an opening is formed on substantially the entire one end surface, and the first storage chamber is in contact with the surface opposite to the opening. An integral container in which the second storage chamber is formed in contact with the opening, the ink supply port and the atmosphere communication port provided on a surface of the container opposite to the opening, and The negative pressure generating member housed in the first storage chamber from the opening, and the negative pressure generating member housed in close contact with each other, facing the surface of the container opposite to the opening, A partition member that is joined to a predetermined position inside to partition the first storage chamber and the second storage chamber and that has the minute communication portion at a position that substantially faces the ink supply port; and the opening of the container. Lid bonded to the part to close the opening Comprising a timber, wherein the ink damming wall separating said negative pressure generating member and the atmosphere communication port, an ink tank of an ink jet recording apparatus characterized by being integrally formed on the container side.