JPH10202896A - Ink tank for ink recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of troublesome replacement of ink tank without increasing the capacity by partitioning the ink tank body into two chambers, i.e., an ink supply liquid chamber and an ink supplementary liquid chamber for supplementing ink to the ink supply liquid chamber through a communication passage, by means of a flexible member. SOLUTION: An ink tank 16 is partitioned into an ink supply liquid chamber 55 and an ink supplementary liquid chamber 60 by means of a movable wall, i.e., a laminate film 57. The liquid chamber 55 is defined by an ink tank base 56 and the film 57 while the liquid chamber 60 is defined by an ink tank cover 64 bonded to the base 56 and the film 57. Consequently, a semi-enclosed liquid chamber 55 and a liquid chamber 60 where the supplementary ink opened to the atmosphere is replaced by residual air are formed in the tank 16. Since the ink can be supplementary by an amount used for printing, a small ink tank requiring no excessive ink supply can be employed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink tank for an ink recording apparatus used in an ink recording apparatus such as an ink jet recording apparatus, a copying machine, and a facsimile.

[0002]

2. Description of the Related Art Conventionally, an ink recording apparatus for forming an image by using ink has been used as an output device such as a facsimile or a computer. Particularly, recently, a demand for higher speed has been increasing. Hereinafter, an ink tank used in a conventional ink recording apparatus will be described with reference to FIG.

FIG. 9 is an exploded perspective view showing the structure of a conventional ink tank. In the figure, reference numeral 1 denotes an ink absorber which absorbs and retains ink by capillary force, which is formed by mixing and foaming polyether polyol, toluene diisocyanate, silicon, tertiary amine, etc., and subjecting the film to a film removal treatment by an explosion method after foaming. The communication type ether-based urethane foam is used. The ink absorber 1 is compressed by an arbitrary volume and inserted and held in the ink holding container 2 with almost no gap.

[0004] The ink holding container 2 is mounted on a carriage that reciprocates on a recording medium, and a recording head 3 is adhered to the ink holding container 2, whereby the recording head 3 moves in parallel with the recording medium. This recording head 3
Ink is selectively ejected onto a recording medium in response to a print signal to form a picture or character composed of a matrix of dots on the recording medium.

[0005] As a method of discharging ink, there are a method of forming bubbles in the ink by heating a heater disposed in the ink, and discharging an ink droplet to a recording medium by the pressure.
Alternatively, a method of using a piezo element or the like to eject ink by a volume change due to the fluctuation is adopted.

Reference numeral 4 denotes a filter, which is an ink supply port 6 located directly above the recording head 3 of the ink holding container 2.
Is attached by ultrasonic welding or the like. The ink absorber 1 is locally compressed in the vicinity of the filter 4 and has a higher capillary force than other parts, and has an effect of collecting the retained ink in the vicinity of the filter 4. When the ink held in the ink absorber 1 in the ink holding container 2 is supplied to the recording head 3, dust and bubbles remaining when the ink is filled in the ink absorber 1 are removed. And clogging of the ink ejection port of the recording head 3 caused by entry of air from the gap between the ink container 2 and the ink holding container 2.

Reference numeral 5 denotes an air communication port provided on the upper portion of the ink holding container 2 for communicating the inside of the ink holding container 2 with the atmosphere. When the ink is continuously ejected from the recording head 3 to the recording medium, the pressure in the ink holding container 2 is reduced by the reduced amount of the ink volume, but the air is appropriately introduced into the ink holding container 2 from the atmosphere communication port 5. This prevents a sudden pressure change in the ink holding container 2.

In the above-described ink tank, since the recording head 3 is bonded to the ink holding container 2 and the recording head 3 and the ink holding container 2 are integrated, the recording head 3 is used after the ink in the ink holding container 2 is consumed. Despite the possibility, it is necessary to replace it with a new ink tank.

To solve such a problem, there has been proposed an ink tank in which a recording head and an ink holding container can be separated.

FIG. 10 is a sectional view showing the structure of a conventional head-separated ink tank. This head-separated ink tank is separable into an ink holding unit 7 and a recording head unit 8. The ink holding unit 7 includes an ink holding container 2 containing an ink absorber 1. An air communication port 5 for introducing air into the ink holding container 2 is provided. The ink holding container 2 is provided with a protrusion 9 for engaging with an engagement hole 12 provided in a recording head holding member 11 described later.

The recording head unit 8 has a recording head 3 for ejecting ink adhered and fixed to a recording head holding member 11. The recording head holding member 11 has an ink for supplying ink to the recording head 3. A supply port 6 is formed,
Immediately above the ink supply port 6, a filter 4 for removing dust and excess air bubbles is attached by caulking by ultrasonic welding or the like. Further, when the ink holding section 7 is inserted into the recording head section 8, an engagement hole 12 with which the projection 9 of the ink holding section 7 is engaged is provided.

When the ink holding section 7 and the recording head section 8 are engaged, the ink supply port 6 and the filter 4 compress and press the ink absorber 1 through the ink supply hole 10 of the ink holding section 7. The recording head unit 8 and the ink holding unit 7 are mounted on the carriage by engaging the ink holding unit 7 with the recording head unit 8 after mounting the recording head unit 8 or by mounting the recording head unit 8 and the ink holding unit 7 on the carriage. Is carried out in a state where is engaged and held.

In the above-described head-separated ink tank, since the ink holding unit 7 and the recording head unit 8 are separable, even if ink in the ink absorber 1 is consumed, only the ink holding unit 7 is removed from the carriage. Since the replacement is sufficient, there is an advantage that the running cost is reduced and the cost is reduced.

[0014]

However, in the above-described head-separated ink tank, the ink tank must be replaced each time the ink in the ink tank is used up, and frequent replacement is avoided. For this reason, when the capacity of the ink tank is increased, there is a problem in that the carriage to which the ink tank is mounted and moved becomes large, and it is difficult to increase the printing speed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink tank for an ink recording apparatus which does not require an ink tank mounted on a carriage to be large and does not require frequent replacement of the ink tank.

[0016]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an ink tank for supplying ink to a recording head of an ink recording apparatus. In one embodiment, one of the chambers is an ink supply liquid chamber for supplying ink to the recording head, and the other chamber is an ink replenishment liquid chamber for replenishing the ink supply liquid chamber with ink through a communication passage.

Thus, it is possible to obtain a small-sized ink tank in which it is only necessary to successively replenish the ink by an amount corresponding to the volume reduction of the ink used for printing without replacing the ink tank.

[0018]

According to the first aspect of the present invention, an ink tank body is divided into two chambers by a flexible member, one of which is an ink supply liquid chamber for supplying ink to a recording head, and the other is an ink supply liquid chamber. Is an ink tank for an ink recording apparatus which is an ink replenishing liquid chamber for replenishing the ink supply liquid chamber with ink through a communication passage. This makes it possible to successively replenish the ink by an amount corresponding to the reduction in the volume of the ink used for printing, and to provide a small ink tank that does not need to replenish the excess ink. Further, it is not necessary to frequently replace the ink tank as in the related art.

According to a second aspect of the present invention, there is provided an ink tank in which an elastic member for pressing the flexible member in a direction to increase the volume of the ink supply liquid chamber is provided in the ink tank body. This makes it possible to easily suck the refill ink from the ink replenisher chamber into the ink supply chamber.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 9 is a cross-sectional view of a carriage portion of the ink jet recording apparatus according to the embodiment of the present invention, and is a cross-sectional view showing a combined state of a recording head, a head block, an ink tank, and a carriage. The recording head according to the present embodiment is of an energized bubble jet type that performs recording using an electrode that generates thermal energy for causing a boiling phenomenon in the ink itself.

In FIG. 9, reference numeral 13 denotes a recording head, which is adhered and held on a heat sink 14. The radiator plate 14 is made of metal such as aluminum in order to prevent a temperature rise of an IC (not shown) attached to the device, and is bonded and fixed to a head block 15 made of resin such as polycarbonate. I have.

Reference numeral 16 denotes an ink tank.
5 are removably inserted into the head block 15 along the positioning ribs 17. This ink tank 16
After the head block 15 is detachably mounted on the carriage 18, the head block 15 is fixed to the head block 15 by a tank cover 19 rotatably held by the carriage 18.

The ink supply port 20-1 to which ink is supplied from the ink tank 16 has a filter 21 for preventing clogging of the recording head 13 due to dust and extra air bubbles when supplying ink to the recording head 13. The filter 21 is fixed by ultrasonic welding or the like.
An elastic member 22 such as a PDM is pressed and held.

With the above configuration, the ink tank 16 can be replaced while the head block 15 is fixed to the carriage 18, and the head block 15 and the ink tank 16 can be replaced simultaneously.

Next, the arrangement and operation of the recording head 13 of the ink jet recording apparatus according to the present embodiment will be described with reference to FIG.
This will be described with reference to FIG. FIG. 10 is a perspective view showing the ink jet recording apparatus according to the embodiment of the present invention in which the recording head 13 is set in the horizontal printing position.

In FIG. 10, the recording medium 23 is fed from the back of the platen 25 to the front using a pickup roller 24, and the recording medium 23 is fixed to the platen 25 by a feed roller 26 that presses in the moving direction of the carriage 18. I do.

The carriage 18 includes a carriage guide 27 and a carriage shaft 2 arranged in parallel with the printing surface.
8 is engaged with a pulley 30 rotatably supported by the left and right side plates 29 and a timing belt 32 connected to a drive pulley 31.
4 reciprocates in the left-right direction with respect to the recording medium 23 fed. The timing belt 32 includes the drive pulley 3
1 and driven by a drive motor 33, and is rotationally controlled in conjunction with forward and reverse rotation of the drive motor 33.

Reference numeral 34 denotes a photocoupler, and a projection 35 of the carriage 18 is provided at an arbitrary position near the photocoupler 34.
Is a home position detecting means for detecting the rotation direction of the driving motor 33 and switching the rotation direction. The image recording signal is sent to the recording head 13 in a timely manner with the movement of the carriage 18 on which the recording head 13 is mounted.
3 is recorded.

Numeral 36 denotes a cap member, which is clogged with the dried ink at the ink ejection portion of the recording head 13 through the opening in the cap, and is provided with the recording head 13 for supplying the ink in the ink tank 16 to the ink ejection portion. Perform suction recovery. Reference numeral 37 denotes a cleaning blade which moves up and down with respect to the recording head 13 and
And removes excess ink adhered to the surface of the recording head 13 when sucked or after printing. Reference numeral 38 denotes a cam for transmitting drive to the cap member 36 and the cleaning blade 37 for performing suction recovery, a cleaning operation, and the like at a predetermined position. The cam 38 rotates the cleaning motor 39 supported by the main body support plate separately from the drive motor 33. It rotates in conjunction with the operation. Note that the suction operation, the blade operation, and the like need not be in this mode, and may be a conventionally known method.

The timing of suction recovery, blade operation, and the like is controlled by detecting the home position detection signal by the photocoupler 34 when the carriage 18 comes to the home position side area, and controlling the rotation operation of the motor at a predetermined timing by desired processing. It is configured to be performed.

Next, the ink replenishing section will be described. The ink replenishing tank 40 is detachably held by a tank holder 41 arranged on the upper side of the carriage 18 opposite to the home position. The tank holder 41 is rotatably held by the subframe 42 and the side plate 29. I have. The tank holder 41 has an ink replenishing operation restricted by a cam gear 44 as a stopper provided at a lower portion of the tank holder 41. Usually, the carriage 18 is used to abut the cam gear 44 and to prevent damping during transportation. Side is biased by a spring 43-1.

Reference numeral 44 denotes a cam gear, which rotates in conjunction with the stepping motor 45, and converts the rotational movement of the stepping motor 45 into a vertical movement of the tank holder 41. The cam gear 44 is normally urged in one direction by a spring 43 so that the tank holder 41 does not drop below an arbitrary position. Here, the ink replenishment tank 40 is arranged at the upper portion on the side opposite to the home position, but the ink replenishment tank 40 may be arranged at the home position side. When the ink is supplied to the ink tank 16 when the ink is supplied to the ink tank 16 and the ink is leaked from the head 13 when the ink is supplied to the ink tank 16, the leaked ink may be sucked by the cap member 36. There is an advantage that you can.

Next, the ink replenishment operation by the ink replenishment tank 40 will be described with reference to FIG. FIG. 3 is a longitudinal sectional view of the ink replenishing unit and the carriage unit according to the embodiment of the present invention.

When the carriage 18 stops at a predetermined position below the tank holder 41, the stepping motor 4
The cam gear 44 rotates in conjunction with the rotation of 5, and the tank holder 41 urged by the spring 43 rotates and descends. At this time, the valve 46, which is held by the tank holder 41 so as to be able to move up and down and is always pressed downward by the spring 43-2, is provided with a hole for ink supply.
To the ink replenishing port 47 of the ink tank 16 mounted on the printer. When the tank holder 41 is further lowered, the valve 46 moves upward in the O-ring 50 press-fitted into the supply port 49 of the ink bag 48, and can swing at the O-ring 50 portion at the supply port 49 of the ink bag 48. Plug member 53 held in
Push up. Thus, the ink in the ink bag 48 is replenished from the valve 46 into the ink tank 16 by the water head pressure determined by the water level of the ink.

The ink bag 48 is hermetically sealed with a heat seal or the like on three sides of a laminated film in which a flexible adhesive layer is made of polypropylene and an aluminum vapor-deposited film having good air barrier properties is laminated. A hard ink supply member 54 is welded to the other side.

When the ink bag 48 is in a completely sealed state, it is necessary to perform the air replacement accompanying the reduction of the ink.
Since the hole diameter of the valve 46, which is the ink replenishing port, is small, it is difficult to replace the air from the valve section. In this case, if the ink bag 48 is a very soft flexible bag, there is no problem because the ink bag shrinks by the reduced amount of ink. In addition, if the ink bag 48 has a communication port with the fine air, the air can be introduced into the ink bag 48 by the reduced amount of the ink.
However, in this case, since air is mixed into the ink bag 48, when an external change such as a temperature rise occurs, the ink may leak due to expansion of the air.

FIG. 4 is a partially exploded view of the ink replenishing tank 40 according to the embodiment of the present invention, and shows a means for increasing the replenishing speed of the ink from the ink bag 48. In the ink replenishing container 51, a pressurizing means including a leaf spring 52 for constantly pressing the ink bag 48 is provided. This leaf spring 52
Has a function of pressing the ink bag 48 to push out the ink from the valve 46, and can shorten the ink supply time as compared with a simple replenishment by the head pressure. The leaf spring 52 desirably discharges ink efficiently, and is preferably a spring of a type that can always be pressed with a substantially equal load in a direction in which the volume of ink is reduced. For example, a pressure amount such as a trapezoidal spring or a disc spring is preferably used. By using a spring whose pressing force is substantially constant with respect to the change in the pressure, the ink bag 48 is always pressed with almost the same load from the beginning to the end of use, the ink replenishment amount is constant, and the opening and closing time of the valve 46 is adjusted. By doing so, a fixed amount of ink can be filled.

As described above, the amount of ink in the ink tank 16 mounted on the carriage 18 decreases, and
Is moved to the position of the ink replenishing tank 40, the ink in the ink replenishing tank 40 is automatically supplied under pressure higher than the head pressure of the ink in the ink replenishing tank 40 by the action of the leaf spring 52.

In this apparatus, since the ink tank 16 and the ink replenishment tank 40 on the carriage 18 are separated from each other, the carriage 18 can be reduced in size and weight. Accurate operation can increase the printing speed. Further, the ink capacity in the ink replenishment tank 40 can be increased, and the ink replenishment tank 40 with low running cost can be provided.

Next, the structure of the ink tank 16 will be described with reference to FIGS. FIG. 5 is an exploded perspective view showing a configuration of the ink tank 16 according to the embodiment of the present invention.
FIG. 6 is an explanatory diagram of the operation principle of the ink tank 16 of FIG.

The ink tank 16 is partitioned into two chambers, an ink supply liquid chamber 55 and an ink replenishment liquid chamber 60, by a laminate film 57 which is a movable wall.

The ink supply liquid chamber 55 is defined by an ink tank base 56 and a laminate film 57.
The laminate film 57 is made of a multi-layer made of a flexible polypropylene film having an adhesive layer and an aluminum vapor-deposited film having a good air barrier property.

The ink tank base 56 is made of a resin such as polypropylene of the same material so that the laminate film 57 can be easily heat-sealed. An ink supply port 20 for supplying ink to the head block 15 is formed below the ink supply liquid chamber 55.

Numeral 58 denotes a spring for making the inside of the ink supply liquid chamber 55 a uniform negative pressure. Numeral 59 denotes a steel plate made of a thin resin for giving a reaction force to the spring 58. A part of the film 57 on the ink supply liquid chamber 55 side is heat-sealed.

The spring 58 constantly presses the steel plate 59 together with the laminate film 57 to make the inside of the ink supply liquid chamber 55 a negative pressure. Since it shrinks to the height of the wire diameter of
The displacement of the laminate film 57 and the steel plate 59 can be increased, and the volume change of the ink supply liquid chamber 55 can be increased. That is, the ink supply liquid chamber 55
It is possible to increase the amount of the refill ink into the inside. The force of the spring 58 becomes a force for sucking the ink in the ink supply chamber 60 into the ink supply chamber 55 when the ink in the ink supply chamber 55 decreases.

The ink replenisher chamber 60 is defined by an ink tank cover 64 joined to an ink tank base 56 and a laminate film 57. The ink tank cover 64 is made of the same material so that it can be easily heat-sealed to the ink tank base 56. Also at the top,
When the ink is replenished from the ink replenishing container 51, an oval ink filling port 61 is provided so that the air in the ink replenishing liquid chamber 60 is easily replaced with the replenished ink.

Further, a communication passage 62 for moving and supplying the ink replenished in the ink replenishing liquid chamber 60 to the ink supply liquid chamber 55 is provided in the ink tank 16.
6, a hydrophilic filter 63 having a stronger capillary force than the filter 21 provided in the ink supply port 20-1 of the head block 15 shown in FIG. They are joined by welding or the like.

Next, a procedure for moving and supplying ink from the ink replenishing liquid chamber 60 to the ink supply liquid chamber 55 is shown in FIG.
This will be described with reference to FIG.

FIG. 6A shows a state in which the ink supply liquid chamber 55 is filled with ink. The spring 58 presses the steel plate body 59 together with the laminate film 57 so that the inside of the ink supply liquid chamber 55 is filled. Negative pressure. Even if the ink replenished in the ink replenishing liquid chamber 60 is sucked into the ink supplying liquid chamber 55 at a negative pressure, the ink supplying liquid chamber 55
The steel plate 59 is pressurized by the spring 58 so that the inner volume does not become full but expands outward in the direction of increasing the volume. As a result, the internal pressure of the ink supply liquid chamber 55 is lower than the atmospheric pressure (negative pressure),
The back pressure of the ink ejection port is generated, a meniscus of the ink in a concave state is formed in the ink ejection port, and the state of the ink ejection amount is stabilized.

Here, the ink in the ink supply liquid chamber 55 continues to be supplied to the head block 15 shown in FIG. 9, and when the ink in the ink supply liquid chamber 55 decreases, the ink in the ink supply liquid chamber 55 decreases by the reduced amount of the ink. The pressure is reduced, and the steel plate body 59 moves together with the laminate film 57 in a direction to reduce the volume of the ink supply liquid chamber 55.

Further, as shown in FIG. 6B, when the amount of ink in the ink supply liquid chamber 55 decreases, the ink replenishing container 51
The ink is replenished to the ink replenishing liquid chamber 60 through the ink filling port 61 by a predetermined amount. FIG. 6C shows a state in which the ink has been replenished into the ink replenishing liquid chamber 60. In this state, the compressive force of the spring 58 (the force pressing the steel plate body 9) is increased, and The negative pressure in 55 is large. Here, since the filter 63 provided in the communication path 62 is made of a hydrophilic material, the ink remaining in the ink supply liquid chamber 55 and the ink in the ink replenishment liquid chamber 60 are connected via the filter 63, and the ink replenishment is performed. The ink in the liquid chamber 60 is rapidly sucked into the ink supply liquid chamber 55 and moves. As a result, the state returns to the state shown in FIG.

As described above, by partitioning the inside of the ink tank 16 with the flexible laminated film 57, the ink supply liquid chamber 55 in a semi-hermetic state inside the ink tank 16 and the ink replenished by being opened to the atmosphere are provided. An ink replenisher chamber 60 in which the remaining air is replaced is formed. As a result, replenishment ink can be filled by an amount corresponding to the volume reduction of ink used for printing, and an efficient ink tank that does not need to replenish excess ink can be provided. Further, by using a spring 58 which is an elastic member for generating a negative pressure in the ink supply liquid chamber 55, the replenishment ink can be easily sucked from the ink replenishment liquid chamber 60 into the ink supply liquid chamber 55. .

FIGS. 7 and 8 are diagrams showing examples of the arrangement of ink replenishment tanks and ink tanks when four color inks of black, cyan, magenta, and yellow are used. As shown in FIG. 7, by increasing the capacities of the black ink replenishing container 51 and the ink tank 16 which are most frequently used for printing characters and ruled lines, the number of replacements of the ink replenishing container 51 can be reduced. In addition, the amount of printing that can be performed by one replenishing operation of the ink tank 16 can be increased, the speed of printing throughput can be improved, and the running cost of black ink can be reduced.

Further, as shown in FIG. 7, the valve 46 of the ink replenishing tank 51 and the ink filling port 6 of the ink tank 16 are provided.
By arranging black, cyan, magenta, and yellow at an unequal pitch, it is possible to easily supplement any one color. As another example, as shown in FIG. 8, the valves 46 of the ink replenishing container 51 are arranged in a staggered manner, and the ink filling ports 61 on the ink tank 16 side are arranged in a line. 46 are arranged in a line, and the ink filling ports 61 on the ink tank 16 side are arranged in a staggered arrangement, so that the ink replenishing container 51 can be compactly arranged.

[0055]

According to the present invention, the following effects can be obtained.

(1) The ink tank main body is divided into two chambers by a flexible member, one of which is an ink supply liquid chamber for supplying ink to a print head, and the other of which is connected to the ink supply liquid chamber through a communication passage. By using an ink replenisher chamber to replenish the ink, the ink can be replenished by the volume of the ink used for printing sequentially, and a small ink tank that does not need to be replenished with extra ink can be provided. it can. Further, it is not necessary to frequently replace the ink tank as in the related art.

(2) By providing the ink tank body with an elastic member for pressing the flexible member in the direction of increasing the capacity of the ink supply liquid chamber, the refill ink is easily sucked from the ink supply liquid chamber into the ink supply liquid chamber. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a sectional view of a carriage portion of an ink jet recording apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an ink jet recording apparatus according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an ink replenishing unit and a carriage unit according to the embodiment of the present invention.

FIG. 4 is a partially exploded view of an ink replenishing tank according to the embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a configuration of an ink tank according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of the operation principle of the ink tank of FIG.

FIG. 7 is a diagram showing an arrangement example of an ink replenishment tank and an ink tank.

FIG. 8 is a diagram showing an arrangement example of an ink replenishment tank and an ink tank.

FIG. 9 is an exploded perspective view showing the structure of a conventional ink tank.

FIG. 10 is a sectional view showing the structure of a conventional head-separated ink tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink absorber 2 Ink holding container 3 Recording head 4 Filter 5 Air communication port 6 Ink supply port 7 Ink holding part 8 Recording head part 9 Projection 10 Ink supply hole 11 Recording head holding member 12 Engagement hole 13 Recording head 14 Heat sink Reference Signs List 15 head block 16 ink tank 17 positioning rib 18 carriage 19 tank cover 20 ink supply port 20-1 ink supply port 21 filter 22 elastic member 23 recording medium 24 pickup roller 25 platen 26 feed roller 27 carriage guide 28 carriage shaft 29 side plate 30 pulley 31 Drive Pulley 32 Timing Belt 33 Drive Motor 34 Photocoupler 35 Projection 36 Cap Member 37 Cleaning Blade 38 Cam 39 Cleaning Motor 40 ink refill tank 41 tank holder 42 subframe 43 spring 43-1 spring 43-2 spring 44 cam gear 45 stepping motor 46 valve 47 ink refill port 48 ink bag 49 supply port 50 O-ring 51 ink refill container 52 leaf spring 53 plug member 54 Ink supply member 55 Ink supply liquid chamber 56 Ink tank base 57 Laminating film 58 Spring 59 Steel plate body 60 Ink replenishment liquid chamber 61 Ink filling port 62 Communication path 63 Filter 64 Ink tank cover

Claims (2)

[Claims] An ink tank for supplying ink to a recording head of an ink recording apparatus, wherein an ink tank body is partitioned into two chambers by a flexible member, and one of the chambers supplies ink to the recording head. An ink tank for an ink recording apparatus, wherein an ink supply liquid chamber is used, and the other chamber is used as an ink replenishment liquid chamber for replenishing the ink supply liquid chamber with ink through a communication passage. 2. An ink tank for an ink recording apparatus according to claim 1, wherein an elastic member for moving said flexible member in a direction to increase the volume of said ink supply liquid chamber is provided in said ink tank body.