JP6792972B2 - Damper mechanism in inkjet recording devices and inkjet recording devices - Google Patents

Description

The present invention relates to a damper mechanism used in an inkjet recording device (printer, plotter, etc.) and an inkjet recording device using the damper mechanism, and particularly a damper mechanism and the damper that can be used in a large-sized inkjet recording device. It relates to an inkjet recording apparatus using a mechanism.

Conventionally, there has been known an inkjet recording device that records characters and images on a recording medium by using an inkjet head that ejects ink from a plurality of nozzles. In this inkjet recording device, while moving the carriage on which the inkjet head is mounted with respect to the recording medium in the main scanning direction, ink is ejected from the nozzle of the inkjet head to print a dot pattern in a predetermined area, and the print width is equal to the print width. There is an apparatus having a structure in which the recording medium is moved by a predetermined amount in the sub-scanning direction after the main scanning of the above is completed, and printing of the entire desired area is performed by repeating these operations. In such an inkjet recording device that prints a dot pattern while moving the inkjet head in the scanning direction, in the case of a structure in which the ink cartridge or the like is not directly mounted on the carriage, the ink supply unit (cartridge, ink tank, etc.) It is necessary to connect the distance to the ink jet head with an ink supply path (ink tube, etc.) to supply ink, and in that case, the ink in the ink supply path moves due to the inertial force generated by the movement of the carriage, and the ink moves. Ink ejection of the inkjet head may become unstable due to the influence of ink pressure fluctuation, ink may leak, or the meniscus of the nozzle opening may be destroyed, which may cause adverse effects such as nozzle omission.
Therefore, it is necessary to keep the ink inside the inkjet head within an appropriate pressure range, and when such an inkjet head is used, the ink ejection part of the print head is from a place where the ink is stored, such as an ink cartridge or an ink tank. Some devices are equipped with a damper mechanism in order to buffer positive and negative pressure fluctuations caused by ink movement in the ink supply path up to and prevent the ink in the head from being affected.
In this type of damper mechanism, a mechanism having one pressure chamber for the ejection portion of the inkjet head is common, but two pressure chambers are provided for the ink ejection portion of the inkjet head and two pressure chambers are provided. It is known that the damping capacity is improved by communicating the pressure chambers with a communication port and operating the whole as one large pressure chamber (see, for example, Patent Document 1).
It is also known that a valve structure having a self-sealing function is used to block pressure fluctuations on the inkjet head (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2003-220712 Japanese Unexamined Patent Publication No. 2004-142405

When there is only one damper, or when using a damper that connects two pressure chambers with a communication port to operate the entire pressure chamber as one pressure chamber, the pressure fluctuation caused by the movement of the carriage is printed on a particularly wide print medium. In a large-sized inkjet printer, the head moves a long distance and the moving speed is fast due to the improvement of printing speed in recent years. Therefore, the amount of ink in the ink supply path increases and the acceleration applied to the ink also increases, so that the pressure fluctuates. It tends to grow. Therefore, in order to cope with large pressure fluctuations, if the flexible film of the single damper mechanism or the leaf spring for preventing sticking is strengthened, the displacement of the flexible film may be delayed, and if it is weakened, it is possible. The responsiveness of the flexure membrane displacement is improved,
During standby, the negative pressure due to the head difference between the inkjet head and the ink cartridge pushes the flexible film initially, which reduces the displacement allowance, so it may not be possible to adequately respond to large pressure fluctuations, and dampers are possible. When the displacement of the flexible film is delayed, the pressure fluctuation caused by the movement of the carriage is momentarily greatly applied to the ink in the head in the initial state. It is desirable to make this pressure fluctuation as small as possible in order to stabilize the ejection of the inkjet head, but in one pressure chamber, the magnitude of pressure propagation applied to the ink in the head cannot be suppressed to a small value instantaneously.
In addition, when a valve structure with a self-sealing function is used, the influence of pressure fluctuations can be blocked, but a mechanism to move the valve structure is required inside, and there is a problem that the valve is always open due to foreign matter being caught, and the valve. There is a possibility that a problem such as a constant closing state may occur due to sticking.
The present invention aims to solve the above problems, is capable of responding to large pressure fluctuations, has good responsiveness to momentary pressure fluctuations, has a simple structure, and is less likely to cause problems. The purpose is to do.

In order to achieve the above object, the present invention has a damper mechanism provided between an ink supply unit and an inkjet print head for absorbing pressure fluctuations applied to ink in the inkjet print head, the first damper and the like. A second damper is provided, and each pressure chamber of the first damper and the second damper is composed of a wall surface and a flexible film arranged so as to face the wall surface, and the first damper and the first damper. It is characterized in that the two dampers are connected by a flow path for pressure resistance having a predetermined length.
Further, in the present invention, a damper body having a partition wall and tubular portions forming recesses on both sides of the partition wall is mounted on a carriage on which the ink jet print head is mounted and moves in the main scanning direction across the printing medium. Flexible films are adhered to both end surfaces in the axial direction of the tubular portion, pressure chambers are provided on both sides of the partition wall to form a first damper and a second damper, and the pressure chamber of the damper is formed in the first damper. A first ink flow hole that communicates with the ink flow hole is provided, a second ink flow hole that communicates with the pressure chamber of the damper is provided in the second damper, and the damper body is connected to an ink supply unit on the inkjet recording device body side. An upstream connecting pipe to be used and a downstream connecting pipe to be connected to the ink ejection portion of the print head are provided, and the first damper is provided with a third ink flow hole communicating with the pressure chamber of the damper. A first flow path in which a fourth ink flow hole communicating with the pressure chamber of the damper is provided in the damper, and a third ink flow hole of the first damper and the upstream connection pipe are provided in the damper main body. The fourth ink flow hole of the second damper and the downstream connecting pipe are connected via a second flow path provided in the damper main body, and the first of the first damper is connected. The ink flow hole 1 and the second ink flow hole of the second damper are connected by a flow path for pressure resistance provided in the damper main body.
Further, in the present invention, the partition wall is provided with a second ink flow hole communicating with the pressure chamber of the second damper, and a concave groove extending in the circumferential direction is provided on one end surface side of the tubular portion of the damper body. A first ink flow hole that guides ink inside the pressure chamber 1 to one of the concave grooves, and a second ink flow hole that communicates the other of the concave grooves with a second pressure chamber provided in the partition wall. A guiding fluid guide portion is provided, and the upper surface of the opening of the concave groove is closed with a member, and the concave groove, a member that closes the opening thereof, a first ink flow hole, the fluid guide portion, and the like. A second ink flow hole communicating with a second pressure chamber provided in the partition wall forms an elongated flow path extending along the cylinder portion in the damper main body, and the flow path is used for the pressure resistance. It is characterized by having a flow path.
Further, the present invention is characterized in that the member that closes the opening is an outer portion that is not used as a flexible portion of the flexible film, and is created by welding that portion.
Further, the present invention is characterized in that a filter for removing minute dust, bubbles, etc. of ink is provided in the flow path for pressure resistance.
Further, the present invention is characterized in that a filter for removing minute dust, air bubbles and the like in the ink is arranged in the second ink flow hole communicating with the second pressure chamber of the partition wall.
Further, the present invention is an inkjet recording device provided between an ink supply unit and an inkjet print head and provided with a damper mechanism for absorbing pressure fluctuations applied to ink in the inkjet print head. A damper 1 and a second damper are provided, and each pressure chamber of the first damper and the second damper is composed of a wall surface and a flexible film arranged so as to face the wall surface. The damper and the second damper are connected by a flow path for pressure resistance having a predetermined length.

In the present invention, since the pressure fluctuation is gradually reduced in the two pressure chambers, the magnitude of the pressure propagation applied to the inkjet print head can be instantaneously suppressed to a small size, the print quality can be improved, and the inkjet can be used. Since it is possible to suppress the influence on the ink in the print head, it is possible to stabilize the ink ejection, and it is also possible to deal with large pressure fluctuations and momentary pressure fluctuations. In addition, since the structure is simple and defects are unlikely to occur, the man-hours required for stable ink ejection and maintenance are reduced. In addition, since the pressure chambers are provided on the front and back sides of the wall surface and the ink flow paths are provided on the outer circumference of the pressure chambers, it is possible to handle as one damper even if two dampers are used and the capacity of the pressure chamber is increased. Yes, it can be mounted compactly even when mounted on a head carriage or the like.
In addition, since a part of the flexible film can be used to cover the upper surface of the recess at the time of welding, it is easy to prepare.

It is explanatory drawing of the damper mechanism which omitted the flexible film. It is an external appearance explanatory view of the damper mechanism which omitted the flexible film. It is an external appearance explanatory view of the damper mechanism which omitted the flexible film. It is sectional drawing on the AA line of a damper mechanism. It is sectional drawing BB of a part of a damper mechanism. It is explanatory drawing of this invention. It is a principle explanatory drawing of this invention. It is explanatory drawing of this invention. It is a graph which shows the pressure fluctuation characteristic applied to the ink ejection part of a head.

The configuration of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 7 is a schematic explanatory view of the inkjet recording device 2, wherein the inkjet recording device 2 moves each print head 4 with respect to the recording medium in the main scanning direction with respect to the carriage on which the plurality of inkjet print heads 4 are mounted. Ink is ejected from the nozzle portion 4a (ink ejection portion) of the above to print a dot pattern in a predetermined area, and when the main scanning for the print width is completed, the recording medium is moved by a predetermined amount in the sub-scanning direction, and these operations are performed. By repeating the above, printing of all desired areas is performed.

The carriage on which the inkjet print head 4 is mounted is equipped with a damper 8 that buffers pressure fluctuations generated in the ink in the ink supply path 6 including the ink tube. In the damper 8, the ink in the ink supply path 6 moves due to the inertial force generated by the movement of the carriage, whereby the pressure applied to the ink in the nozzle of the ink ejection portion 4a of the print head 4 is relieved, and the ink is charged. Prevents poor discharge and destruction of the nozzle opening meniscus. Ink in the ink supply path 6 and in the print head 4 due to the water head difference between the liquid level of the ink supply unit 7 composed of ink cartridges and the like arranged on the main body side of the inkjet recording device 2 and the ink discharge unit 4a of the print head 4. Is held at a negative pressure so that it does not leak from the nozzle, and the inside of the ink supply path 6 is held at a negative pressure. Therefore, when ink is not ejected, a meniscus is formed in the opening of the nozzle of the ink ejection portion 4a. It is configured in.

In this embodiment, for convenience of explanation, only one damper will be described, and the description of other dampers prepared for each print head will be omitted.
FIG. 1A shows a front explanatory view of the damper, and FIG. 1B shows a rear explanatory view, respectively, in order to show the inside of the pressure chamber, so that the flexible film is omitted. As shown in FIGS. 1 and 2, in the damper 8, the first damper 14 and the second damper 16 are formed on both sides of the partition wall 12 of the damper main body 10. The damper main body 10 includes a disk-shaped partition wall 12, a tubular portion 18 formed around the partition wall 12, and connecting portions 19 and 20 protruding from the tubular portion 18. A concave groove 22 extending a predetermined length along the circumferential direction of the opening end and a concave groove 24 are formed on one open end side of the tubular portion 18.

An upstream connecting pipe 26 is attached to the connecting portion 19, and the pipe 26 communicates with a pipeline 28 provided in the connecting portion 19. The pipeline 28 is connected to one side of the groove 22. The upstream side connecting pipe 26 is connected to a tube constituting the ink supply path 6 of the inkjet recording device 2. The other end of the groove 22 communicates with the pressure chamber 34 of the first damper 14 through the ink flow hole 30 formed in the tubular portion 18. One of the concave grooves 24 communicates with the pressure chamber 34 of the first damper 14 through the ink flow hole 32 formed in the tubular portion 18.

As shown in FIG. 5, the other end of the concave groove 24 communicates with the fluid guide portion 36 having a hollow portion integrally formed in the tubular portion 18. As shown in the drawing, the ink flow hole 38 formed in the partition wall 12 is slightly expanded in a funnel shape at one portion thereof, the hollow portion of the guide portion 36 communicates with the flow hole 38, and the concave groove 24 is a fluid. It communicates with the pressure chamber 40 of the second damper 16 through the ink flow hole 38 inside the guide portion 36. A SUS (stainless steel) mesh filter 42 is adhered to the partition wall 12 at a position facing the ink flow hole 38, and the filter 42 removes minute dust and air bubbles in the ink entering the second damper 16. It is configured to be.

A concave groove 44 extending by a predetermined length along the circumferential direction of the opening is formed on the other opening end side of the tubular portion 18. One of the concave grooves 44 is connected to the ink flow hole 46 of the tubular portion 18 formed at a position away from the ink flow hole 38, and the other of the concave groove 44 is a pipeline provided in the connection portion 20. It is connected to one of 48. The other side of the pipeline 48 is connected to a downstream connecting pipe 50 fixed to the connecting portion 20, and the connecting pipe 50 is connected to an ink supply pipe 52 connected to the print head 4. The damper main body 10 is formed with recesses on both side surfaces by the tubular portion 18, and one end surface is formed by sealing the openings of the recesses with film-shaped flexible films 52, 54. The pressure chambers 34 and 40 defined by 54 are formed. The flexible films 52 and 54 are sealed with a margin so that they can be sufficiently bent to the outside and the inside.

Ink filling into the pressure chambers 34 and 40 of the first and second dampers 14 and 16 is performed by sealing the head by a capping mechanism and then sucking ink from the nozzle opening of the ink ejection portion 4a by a pump. ..
By this suction, the ink stored in the ink cartridge 7 passes through the ink supply path 6, the first flow path 62, the pressure chamber 34 of the first damper of the damper 8, the pressure resistance flow path 66, and the ink flow hole. Ink is filled by passing through 38, the filter 42, the pressure chamber 40 of the second damper, and the second flow path 64, entering the print head 4, and sucking ink from the ink ejection portion 4a to the extent that some ink is drawn out. ..

When the suction is completed, the ink in the path is held at a negative pressure due to the difference between the head values of the ink cartridge 7 and the print head 4, and the ink can be ejected from the ink ejection unit 4a. At this stage, the flexible films of the pressure chamber 34 of the first damper and the pressure chamber 40 of the second damper are regulated by the leaf springs 56 and 58 and are maintained in a slightly recessed state and filled with ink. .. After that, as the ink is ejected from the head, the ink is supplied in the direction of the inkjet head 4, so that the ink in the pressure chamber 34 of the first damper and the pressure chamber 40 of the second damper decreases, and the decrease causes the ink cartridge. The ink of 7 is supplied, and the print head 4 is periodically filled with the required amount of ink.

For example, the flexible films 52 and 54 are formed on the damper body 10 by sucking the ink in the pressure chambers 34 and 40 of the first and second dampers 14 and 16 by suction by the capping mechanism or ejecting ink from the head. If it sticks to the partition wall 12, the flexible film blocks the ink supply path from the upstream, which may hinder the ink supply. In this case, most of the ink in the pressure chambers 34 and 40 of the first and second dampers 14 and 16 is discharged, which causes the nozzle to come off.

Therefore, by arranging the first and second leaf springs 56 and 58 at positions forming a predetermined clearance, the contact of the flexible films 52 and 54 with the partition wall 12 of the damper body 10 is restricted. The leaf springs 56 and 58 are arranged by engaging the refracting portion with the engaging recesses 60 and 61 provided at the opening edge of the tubular portion 18, and the flexible films 52 and 54 are attached to the leaf springs 56 and 58. Even when the position is attached, the pressure chambers 34 and 40 of the first and second dampers 14.16 are filled with a predetermined amount of ink, and further displacement is possible from this portion. The flexible film 52 is also prevented from sticking to the partition wall 12. The flexible films 52 and 54 are joined to the opening edge of the tubular portion 18 by heat welding or the like.

The openings of the concave grooves 22, 24, 44 and the fluid guide portion 36 are sealed by the flexible membranes 52, 54, and the cylinder is formed by the concave grooves 22, 24, 44, the fluid guide portion 36, and the flexible membranes 52, 54. On both end faces of the portion 18, along the concave grooves 22, 24, 44 and the fluid guide portion 36, a first flow path 62, a second flow path 64 and a long and narrow pipe line having a predetermined length are formed. A flow path 66 for pressure resistance is formed. It is the outer portion of the flexible membranes 52, 54 that is not used as the flexible portion that closes the opening, and a flow path is created by welding that portion to the damper body 10.

In the present embodiment, since the flexible film is welded to cover both the pressure chamber and the groove together, it is easy to create, and if a transparent member or the like is used, the state of the ink inside can be grasped. ..
In the above configuration, the pressure chambers 34 and 40 of the first and second dampers 14 and 16 are filled with the pressure chambers of the first and second dampers 14 and 16 by the initial filling operation of the ink in the ink ejection portion 4a. Ink is filled up to a portion exceeding the ink flow holes 32 and 46 of 34 and 40.

When the inkjet print head 4 moves in the main scanning direction for printing, positive pressure and negative pressure changes occur in the ink in the ink ejection portion 4a. At this time, the flexible films 52 and 54 are elastically deformed with the pressure change, that is, by changing the volumes of the first and second dampers 14 and 16, the pressure fluctuation is buffered and the inside of the ink ejection portion 4a. A substantially constant negative pressure can be stably maintained in the ink.

The deformation directions of the flexible films 52 and 54 that change the volumes of the first and second dampers 14 and 16 are flexible when the pressure applied from the inside of the ink tube increases as the inkjet print head 4 moves. The films 52 and 54 move in the direction of increasing the volume (in the direction of swelling), and move in the direction of decreasing the volume (in the direction of denting) when the pressure becomes low.

By deforming the flexible films 52 and 54 in this way, the damper 8 buffers the pressure fluctuation of the ink in the ink supply path 6 in response to the acceleration and deceleration of the inkjet print head 4 and the moving direction. The print quality can be improved by stabilizing the ejection by preventing the ink in the ink ejection unit 4a from being affected by the pressure fluctuation.
Next, the operation of suppressing the pressure propagation that is initially excessively applied to the head by accelerating and decelerating the inkjet print head will be described with reference to FIGS. 8 and 9.

In FIG. 9, the horizontal axis represents time and the vertical axis represents pressure. FIG. 9 shows a pressure fluctuation curve (A) applied to the print head when there is no damper, a pressure fluctuation curve (B) applied to the print head when there is one damper, and two dampers shown in the present embodiment. , The pressure fluctuation curve (C) applied to the print head when communicating with the flow path 66 serving as a pressure resistance via the mesh filter 42 is shown. It is desirable that the pressure fluctuation applied to the print head is as small as possible. As shown in FIG. 8A, when there is one damper, the pressure fluctuation ΔP generated on the upstream side of the damper (D) is applied to the pressure chamber of the damper (D), but they communicate with each other in the same manner. It also hangs evenly on the 4 side of the print head. After that, the flexible film of the damper is displaced and the pressure fluctuation is buffered, but the displacement of the flexible film of the damper (D) cannot catch up momentarily. Therefore, the pressure difference that could not be buffered is the ink ejection part of the print head. The effect on the 4a side will appear.

On the other hand, in the present embodiment, as shown in FIG. 8B, the pressure fluctuation ΔP is first transmitted to the pressure chamber of the first damper 1 through the pipeline 28. Next, the pressure fluctuation ΔP in the pressure chamber of the first damper 1 is transmitted to the flow path 66, where a long thin flow path and a filter are present, so that a pressure loss occurs due to the existence of this structure. , Pressure fluctuation ΔP decreases to ΔP'. The pressure fluctuation ΔP'is transmitted to the second damper 2 through the flow path 66, and is transmitted to the print head 4 through the connecting pipe 50.

The pressure fluctuation ΔP on the upstream side of the damper 1 and the pressure fluctuation ΔP'transmitted to the print head 4 are ΔP'<ΔP, and the pressure resistance with one damper or between a plurality of dampers In this embodiment, the pressure fluctuation applied to the print head 4 side can be reduced, and the pressure fluctuation applied momentarily can be suppressed as compared with the case where the flow path 66 is not provided. In order to buffer a large pressure fluctuation, it is necessary to strengthen the flexible film or spring of the damper mechanism, but in that case, the responsiveness deteriorates, so that the responsiveness of the instantaneous pressure fluctuation deteriorates.

In the present embodiment, by arranging the two damper mechanisms in series and providing a structure that loses pressure between them, it is not necessary to make them as strong as when a flexible film, a spring, or the like is provided independently, so that the instantaneous response is good. Therefore, the pressure applied until the flexible film of the damper is displaced can be reduced.
In the present embodiment, a flow path that acts as a resistance to pressure is formed in a composite damper body in which two dampers are integrally formed back to back, but the configuration is particularly limited to a configuration in which two dampers are integrally formed. Instead, two or a plurality of dampers may be formed separately, and these may be connected in series by a thin pressure resistance pipe such as a tube or a pipe.
Further, in the embodiment, the same structure is used for the first and second dampers, but they do not have to be the same. For example, the capacity of the pressure chamber can be changed by the first and second dampers, or a flexible film or a leaf spring. The strength may be changed individually, and it may be used as needed.

2 Ink recording device 4 Printhead 4a Ink ejection part 6 Ink supply path 7 Ink supply part 8 Damper 10 Damper body 12 Partition 14 First damper 16 Second damper 18 Pipe 19 Connection 20 Connection 22 Concave groove 24 Concave Groove 26 Upstream connection pipe 28 Pipe line 30 Ink flow hole 32 Ink flow hole 34 Pressure chamber 36 Fluid guide 38 Ink flow hole 40 Pressure chamber 42 Filter 44 Concave groove 46 Ink flow hole 48 Pipe line 50 Downstream side connection pipe 52 Possible Flexible film 54 Flexible film 56 Leaf spring 58 Leaf spring 60 Engagement recess 61 Engagement recess 62 First flow path 64 Second flow path 66 Pressure resistance flow path

Claims (8)

In a damper mechanism provided between an ink supply unit and an inkjet print head for absorbing pressure fluctuations applied to ink in the inkjet print head, first dampers are provided on both sides of a partition wall of the damper body of the damper mechanism . A second damper is provided, and each pressure chamber of the first damper and the second damper is composed of a wall surface of the partition wall and a flexible film arranged so as to face the wall surface of the partition wall, and the first damper is provided. damper mechanism in an ink jet recording apparatus characterized by the communication with the flow path for pressure resistance with the second damper and a predetermined length and. A damper body having a partition wall and cylinder portions forming recesses on both sides of the partition wall is mounted on a carriage on which the ink jet print head is mounted and moves in the main scanning direction across the printing medium, and the cylinder portion is axially oriented. both end surfaces to adhere the flexible membrane, the first damper and the second damper is formed by providing a pressure chamber on both sides of the partition wall, the pressure chamber communicating with the said the first damper first damper a first ink circulation hole is provided, the second ink circulation hole communicating with the pressure chamber of the said the second damper second damper is provided, the ink supply portion of the ink jet recording apparatus body to the damper body to a downstream-side connecting pipe is provided for connecting the ink discharge portion of the upstream-side connecting pipe and the printhead for connecting, providing the third ink circulation hole communicating with the pressure chamber of the first of said damper first damper, the fourth ink flow hole communicating with the pressure chamber of the second damper to the second damper is provided, the third ink flow hole of the first damper and the upstream connecting pipe to the damper body The fourth ink flow hole of the second damper and the downstream connection pipe are connected via the second flow path provided in the damper main body, and are connected via the first flow path provided. claim 1, characterized in that the communication by the flow path for pressure resistance provided with a second ink circulation hole of the first of the first ink flow hole and the second damper damper on the damper body The damper mechanism in the inkjet recording apparatus described in 1. The partition wall is provided with a second ink flow hole communicating with the pressure chamber of the second damper, and a concave groove extending in the circumferential direction is provided on one end surface side of the tubular portion of the damper body, and the first pressure chamber. A first ink flow hole that guides internal ink to one of the concave grooves, and a fluid guide that guides the other of the concave grooves to a second ink flow hole that communicates with a second pressure chamber provided in the partition wall. The upper surface of the opening of the concave groove was closed with a member, and the concave groove, the member for closing the opening, the first ink flow hole, the fluid guide portion, and the partition wall were provided. A second ink flow hole communicating with the second pressure chamber forms an elongated flow path extending along the cylinder portion in the damper main body, and the flow path is used as a flow path for the pressure resistance. The damper mechanism in the inkjet recording apparatus according to claim 2. The inkjet recording apparatus according to claim 3, wherein the member that closes the opening is an outer portion that is not used as the flexible portion of the flexible film, and is formed by welding the portion. Damper mechanism. The damper mechanism in an inkjet recording apparatus according to claim 1, wherein a filter for removing minute dust and air bubbles of ink is provided in the flow path for pressure resistance. The damper in the inkjet recording apparatus according to claim 4, wherein a filter for removing minute dust and air bubbles in the ink is arranged in a second ink flow hole communicating with the second pressure chamber of the partition wall. mechanism. In an inkjet recording device provided between an ink supply unit and an inkjet print head and provided with a damper mechanism for absorbing pressure fluctuations applied to ink in the inkjet print head, the damper mechanism includes a first damper and a damper mechanism. A second damper is provided, and each pressure chamber of the first damper and the second damper is composed of a wall surface and a flexible film arranged so as to face the wall surface, and the first damper and the second damper are provided. an ink jet recording apparatus characterized by the communication of the damper in the flow passage for pressure resistance with a predetermined length. The inkjet recording apparatus according to claim 7, wherein a filter for removing minute dust and bubbles of ink is provided in the flow path for pressure resistance.

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