JP2017148955A - Ink jet recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording device capable of smoothly returning a liquid component separated by a deaeration module in a state of circulating ink to an ink tank.SOLUTION: An ink jet recording device includes: an ink tank 15 which stores ink; an ink jet head 20 which includes a nozzle for discharging ink; a circulation flow passage 60 in which ink supplied from the ink tank 15 flows and ink recovered to the ink tank 15 again via the ink jet head 20 is circulated; a liquid feeding section 77 which is provided in the circulation flow passage 60 so as to make ink flow to the circulation flow passage 60; and a deaeration module 100 which removes dissolved gas in ink. The ink jet recording device further includes: a negative pressure section 81 which is connected to the deaeration module 100 via a negative pressure flow passage 80 and makes the deaeration module 100 into a negative pressure state; and a separator 82 provided in the negative pressure flow passage 80. A first opening/closing valve 73 is provided in an outlet flow passage 84 which recovers the liquid stored in the separator 82.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ink jet recording apparatus.

  A technique related to an ink jet recording apparatus has been proposed. For example, Patent Document 1 discloses an ink ejection apparatus for suppressing an ink density change due to moisture permeation by defining a moisture permeation amount of a gas permeable membrane used in a deaeration device to 0.5 ml / hour or less. A deaeration device is disclosed. However, an ink composed of a low molecular composition liquid has a small molecular weight, and it is difficult to produce a gas permeable membrane that does not allow the low molecular composition liquid to permeate.

  Patent Document 2 discloses a drawing apparatus in which degassing means is provided in a location near the print head other than the circulation path, and the ink physical property change is reduced by shortening the ink residence time in the degassing means. However, in order to circulate the ink in the print head and to remove dissolved gas and bubbles generated by the cavitation of the head or a circulation pump, it is necessary to provide a deaeration means in the circulation path.

Japanese Patent Application Laid-Open No. 11-042771 JP 2012-152661 A

  In an ink jet recording apparatus, ink is ejected from nozzles of an ink jet head. According to the ink jet recording apparatus, an image can be recorded on a recording medium with high quality. The inventor studied an ink jet head having a structure formed by a plurality of head portions. In that case, the inventor considered the structure which provides a deaeration module with respect to each head part. The degassing module degass the dissolved gas from the ink supplied from the ink tank. The ink deaerated by the deaeration module flows out of the deaeration module and is supplied to the head unit. In the ink jet recording apparatus, by supplying ink with a small amount of dissolved gas to the nozzles of each head unit, preferable ink ejection can be realized, and the quality of the recorded image can be stabilized. In order to stabilize the ejection, for example, the amount of ink stored in the deaeration module is set to a predetermined level in a state where the space in which the ink is stored in the deaeration module is maintained at a pressure (negative pressure) lower than atmospheric pressure. Need to adjust to range.

  The ink is formed by, for example, dispersing predetermined components such as a colorant and an additive in a solvent. The contained component has a predetermined specific gravity. All or some of the contained components have a specific gravity greater than that of the solvent. Therefore, sedimentation of contained components may occur in the ink existing inside the ink jet recording apparatus. Such sedimentation is likely to occur, for example, when an ink jet recording apparatus does not record an image and the ink continuously stagnates in a certain place. When the contained component settles, the density changes, and quality deterioration such as density unevenness or distortion and deterioration of color reproducibility may occur in the ejection result.

  In the ink jet recording apparatus, the dissolved gas in the ink is forcibly discharged from the deaeration module formed in the flow path leading to each head portion. Such deaeration of ink is performed in order to prevent clogging of the nozzles. It has been found that when the ink is forcibly degassed from the degassing module formed in the flow path leading to the predetermined head portion, the liquid component in the ink is reduced. The inventor has studied a configuration in which the liquid component separated by the deaeration module is smoothly returned to the ink tank while circulating the ink.

  An object of the present invention is to provide an ink jet recording apparatus capable of smoothly returning a liquid component separated by a deaeration module in a state where ink is circulated to an ink tank.

  One aspect of the present invention is an ink tank that stores ink, an ink jet head that includes a nozzle that discharges the ink, and the ink supplied from the ink tank flows, and the ink tank again passes through the ink jet head. A circulation flow path for circulating the ink collected in the circulation flow path, a liquid feeding section provided in the circulation flow path for flowing the ink through the circulation flow path, and a deaeration module for removing dissolved gas in the ink. A negative pressure section that is connected to the degassing module via a negative pressure flow path and places the degassing module in a negative pressure state, and a separator provided in the negative pressure flow path, and the liquid stored in the separator The inkjet recording apparatus includes a first opening / closing valve in an outlet flow path to be collected.

  According to this ink jet recording apparatus, the liquid component in the ink separated by the deaeration module can be stored in the separator by closing the first on-off valve and operating the negative pressure part. Next, the liquid component in the ink can be recovered by interrupting the operation of the negative pressure section and opening the first on-off valve. Along with this, by returning the recovered liquid component to the ink tank, the ink component stored in the ink tank can be made to have a constant ratio, and the ink can be circulated.

  The ink jet recording apparatus may include a second on-off valve in the negative pressure flow path connecting the separator and the negative pressure portion.

  According to this ink jet recording apparatus, by closing the second on-off valve, ink can be collected from the first on-off valve without interrupting the operation of the negative pressure portion. Accordingly, the ratio of the ink components stored in the ink tank can be made constant, and the ink can be circulated.

  The ink jet recording apparatus may include a third on-off valve in the negative pressure channel connecting the deaeration module and the separator.

  According to this ink jet recording apparatus, by closing the third on-off valve, it is possible to avoid the influence that the liquid component in the ink separated by the separator flows back to the deaeration module. Accordingly, the ratio of the ink components stored in the ink tank can be made constant, and the ink can be circulated.

  In the ink jet recording apparatus, the second on-off valve and / or the third on-off valve may be a three-way valve, or may be provided in the negative pressure flow path between the second on-off valve and the third on-off valve. An atmosphere release valve may be provided.

  According to this ink jet recording apparatus, the separator is isolated by the second on-off valve and the third on-off valve, and the liquid component in the ink is smoothly transferred from the first on-off valve to the ink tank by introducing the atmospheric pressure. It can be recovered. Accordingly, the ratio of the ink components stored in the ink tank can be made constant, and the ink can be circulated.

  The ink jet recording apparatus may include a pneumatic flow path in the three-way valve and / or the atmosphere release valve. According to this configuration, the liquid component of the ink is collected more smoothly through the first on-off valve by supplying air pressure to the separator closed by the second on-off valve and the third on-off valve. be able to.

The ink jet recording apparatus may include a stirring unit in the ink tank. According to this configuration, even when the liquid component in the ink stored in the separator is returned to the ink tank and is not well mixed, it can be sufficiently mixed by the stirring unit and adjusted to the ink close to the original state. it can. The ink supplied from the ink tank to the ink jet head can be adjusted to a component suitable for ejection from the nozzle.

  According to the present invention, it is possible to obtain an ink jet recording apparatus that can smoothly collect liquid components in ink separated by a degassing module and stored in a separator in an ink tank.

It is the schematic which shows an example of a structure of the inkjet recording device of this invention. It is the schematic which shows an example of a structure of the inkjet recording device of this invention. It is the schematic which shows an example of a structure of the inkjet recording device of this invention. It is the schematic which shows an example of a structure of the inkjet recording device of this invention. It is the schematic which shows an example of a structure of the inkjet recording device of this invention.

  An embodiment for carrying out the present invention will be described with reference to FIGS. The present invention is not limited to the configurations described below, and various configurations can be employed in the same technical idea. For example, some of the configurations shown below may be omitted or replaced with other configurations. Other configurations may be included.

<Inkjet recording apparatus>
In the ink jet recording apparatus 10, images are recorded on various recording media. Examples of the recording medium include fabric or building materials. Inks used for image recording are, for example, four colors of black, magenta, yellow, and cyan. However, you may make it use the ink of a different color from these inks of each color. The number of ink colors may be three or less or five or more. The embodiment will be described without distinguishing ink colors.

  The ink jet recording apparatus 10 includes an ink tank 15, an ink jet head 20, a circulation channel 60, a liquid feeding unit 77, and a control device 90. The ink tank 15 stores ink. The inkjet head 20 includes a plurality of nozzles (not shown). The inkjet head 20 discharges ink from a plurality of nozzles. Ink supplied from the ink tank 15 flows through the circulation channel 60. The circulation channel 60 circulates the ink ejected from the plurality of nozzles. Other description regarding the inkjet head 20 and the circulation flow path 60 will be described later. The liquid feeding unit 77 is provided in the circulation channel 60 and causes ink to flow through the circulation channel 60. The ink is circulated through the circulation channel 60 by the liquid feeding unit 77. As the liquid feeding unit 77, a known pump is exemplified. However, a known mechanism different from the pump can be employed as the liquid feeding unit 77.

  The control device 90 includes a control unit 91, a connection interface 95, and a power source 96. In the embodiment, the connection interface 95 is described as “connection I / F 95”. The control unit 91 controls various operations executed by the inkjet recording apparatus 10. For example, the control unit 91 controls the ejection of ink from the inkjet head 20. The controller 91 controls the opening and closing of each valve described later. The control unit 91 includes, for example, a CPU 92, a storage unit 93, and a RAM 94. The CPU 92 executes arithmetic processing. The storage unit 93 is, for example, a nonvolatile memory and / or a hard disk. The storage unit 93 stores programs for various operations executed by the inkjet recording apparatus 10. The RAM 94 serves as a work area when the CPU 92 executes the program stored in the storage unit 93.

  A first on-off valve 73 is connected to the connection I / F 95. In addition, a second on-off valve 72 and a third on-off valve 71 are connected to the connection I / F 95. The opening signal and closing signal output from the control unit 91 are output from the connection I / F 95 to the first on-off valve 73, the second on-off valve 72, and the third on-off valve 71. The first on-off valve 73, the second on-off valve 72, and the third on-off valve 71 will be described later. 1 to 5, the connection I / F 95 is connected to the first on-off valve 73, the second on-off valve 72, and the third on-off valve 71, and the illustration of the electrical wiring that connects to the power source 96 is omitted. .

<Inkjet head>
The inkjet head 20 includes a plurality of head portions (not shown) and a carriage. The number of head portions and the number of nozzles provided in one inkjet head 20 are appropriately determined in consideration of various conditions.

<Circulation channel>
The circulation channel 60 includes a supply channel 61 and a recovery channel 65. 1-5, the arrow shown in the vicinity of each part which forms the circulation flow path 60, or the inside shows the direction where ink flows through the part.

  The supply flow path 61 is connected to the inkjet head 20. Ink supplied to the inkjet head 20 flows through the supply channel 61.

  The recovery flow path 65 is connected to the ink tank 15, and the ink flowing out from the inkjet head 20 flows.

  The supply flow path 61 is provided with a liquid feeding section 77 and further connected to the deaeration module 100. In the embodiment, the connection position of the deaeration module 100 is a position between the liquid feeding unit 77 and the inkjet head 20. The ink supplied from the ink tank 15 through the supply channel 61 reaches the deaeration module 100 through the liquid feeding unit 77, passes through the inkjet head 20, and is circulated through the circulation channel 60.

  Ink supply to the ink jet head 20 is performed by the ink sucked from the ink tank 15 by the liquid feeding unit 77 flowing into the ink jet head 20 through the deaeration module 100 in the supply flow path 61. Ink that has not been used to eject ink from the inkjet head 20 is returned to the ink tank 15 through the recovery flow path 65. The negative pressure channel 80 connected to the deaeration module 100 includes a negative pressure part 81 that is a vacuum source, a separator 82 that separates gas and liquid discharged from the deaeration module 100, and an outlet from the separator 82. 1 on-off valve 73. Preferably, there may be a second on-off valve 72 that shuts off the path between the separator 82 and the negative pressure part 81 and a third on-off valve 71 that shuts off the path between the deaeration module 100 and the separator 82.

<Deaeration module>
The deaeration module 100 is provided to remove dissolved gas in the ink supplied to the ink jet head 20, and includes, for example, a structure including a separation membrane made of a hollow fiber membrane. Here, the deaeration module using the hollow fiber membrane includes an internal perfusion method in which the ink passes through the hollow portion of the hollow fiber membrane and an external device through which the ink passes around the hollow fiber membrane due to the difference in the ink passage route. Although there is a perfusion method, any method may be used in the present invention.

<Opening / closing operation of each open / close valve of the negative pressure channel and the open / close valve of the outlet channel>
The opening / closing operation of the on-off valves 71 and 72 provided in the negative pressure channel 80 and the on-off valve 73 provided in the outlet channel 84 will be described. The opening / closing of the on-off valves 71, 72, 73 is controlled by the control unit 91 (CPU 92) based on data such as a liquid level sensor (not shown) provided in the separator, but of course, even if it is manually operated. Good. The outlet channel 84 may have a structure in which liquid is collected in the ink tank 15 by piping as shown in FIGS. 1 to 5, or the separator 82 may be simply provided with the opening / closing valve 73.

<Separator>
A separator that can be separated into a gas and a liquid is employed. The separator 82 used in the present invention is a conventionally known separator and is not particularly limited. The separator 82 can withstand vacuum, and the end of the negative pressure flow path 80 connecting the separator 82 and the negative pressure portion 81 on the separator 82 side is connected to a position above the liquid level in the separator 82. Therefore, it is preferable because the liquid does not flow to the negative pressure portion.

<Stirring section>
The ink tank 15 is provided with a stirring unit 14 for mixing the collected liquid and ink. A well-known thing is employ | adopted as a stirrer used for the stirring part 14. FIG. Examples of the stirrer include one that rotates a propeller-like stirrer and a magnetic stirrer, but is not particularly limited.

    <First Example>

  First, the operation when degassing ink will be described with reference to FIG. The ink flowing through the supply channel 61 separates only the gas and liquid that can pass through the membrane from the ink flowing along the gas permeable membrane inside the deaeration module 100 by the pressure reducing action of the negative pressure channel 80, and the separated gas and The liquid is discharged to the separator 82 through the negative pressure flow path 80, and is separated into gas and liquid by the separator 82. At this time, the open / close valve 73 in the separator 82 is closed in order to maintain the reduced pressure state of the negative pressure flow path 80.

  Next, an operation of collecting the liquid component present in the separator 82 generated by the ink deaeration into the ink tank 15 will be described. First, the power source of the negative pressure part 81 is stopped and brought into a stopped state. Next, the on-off valve 73 is opened to bring the separator 82 and the ink tank 15 into communication. In this state, the liquid component inside the separator 82 moves to the outlet channel 84 by its own weight and is collected in the ink tank 15. When canceling the recovery operation, the on-off valve 73 is closed and the power source (not shown) of the negative pressure unit 81 is turned on to set the operation state, thereby returning from the recovery operation state to the deaeration operation state.

  The liquid collected in the ink tank 15 is mixed with the ink in the ink tank 15 and reused. By collecting and mixing the liquid permeated from the degassing module 100 in the supply flow path 61 into the ink tank 15 in the circulation flow path 60 for each ink, the ink in the circulation flow path 60 has substantially constant physical properties and composition. Can be maintained.

    <Second embodiment>

  Next, the operation of the second embodiment will be described with reference to FIG. The ink flowing through the supply channel 61 separates only the gas and liquid that can pass through the membrane from the ink flowing along the gas permeable membrane inside the deaeration module 100 by the pressure reducing action of the negative pressure channel 80, and the separated gas and The liquid is discharged to the separator 82 through the negative pressure flow path 80, and is separated into gas and liquid by the separator 82. At this time, in order to maintain the reduced pressure state of the negative pressure flow path 80, the on-off valve 72 between the separator 82 and the negative pressure portion 81 is in an open state, and the on-off valve 73 is in a closed state.

  Next, an operation of collecting the liquid component present in the separator 82 generated by the ink deaeration into the ink tank 15 will be described. First, the on-off valve 72 is closed, and the separator 82 and the negative pressure part 81 are shut off. Next, the on-off valve 73 is opened to bring the separator 82 and the ink tank 15 into communication. By setting this state, the liquid component inside the separator 82 is moved by its own weight to the outlet flow path 84 and collected in the ink tank 15 without stopping the negative pressure portion 81 frequently. When canceling the recovery operation, the valve state is returned in the reverse order to return from the recovery operation state to the deaeration operation state.

  The liquid collected in the ink tank 15 is mixed with the ink in the ink tank 15 and reused. By collecting and mixing the liquid permeated from the degassing module 100 in the supply flow path 61 into the ink tank 15 in the circulation flow path 60 for each ink, the ink in the circulation flow path 60 has substantially constant physical properties and composition. Can be maintained.

    <Third embodiment>

  Next, the operation of the third embodiment will be described with reference to FIG. The ink flowing through the supply channel 61 separates only the gas and liquid that can pass through the membrane from the ink flowing along the gas permeable membrane inside the deaeration module 100 by the pressure reducing action of the negative pressure channel 80, and the separated gas and The liquid is discharged to the separator 82 through the negative pressure flow path 80, and is separated into gas and liquid by the separator 82. At this time, in order to maintain the reduced pressure state of the negative pressure flow path 80, the on-off valve 71 is in an open state in which the deaeration module 100 and the separator 82 communicate with each other, the on-off valve 72 is in an open state, and the on-off valve 73 is in a closed state. .

  Next, an operation of collecting the liquid component present in the separator 82 generated by the ink deaeration into the ink tank 15 will be described. First, the on-off valve 72 is closed, and the separator 82 and the negative pressure part 81 are shut off. Next, the on-off valve 71 is brought into a state where the deaeration module 100 and the separator 82 are shut off. Finally, the on-off valve 73 is opened to bring the separator 82 and the ink tank 15 into communication. In this state, the liquid component inside the separator 82 moves to the outlet channel 84 by its own weight without flowing back to the degassing module 100 side, and is collected in the ink tank 15. When canceling the recovery operation, the valve state is returned in the reverse order to return from the recovery operation state to the deaeration operation state.

  The liquid collected in the ink tank 15 is mixed with the ink in the ink tank 15 and reused. By collecting and mixing the liquid permeated from the degassing module 100 in the supply flow path 61 into the ink tank 15 in the circulation flow path 60 for each ink, the ink in the circulation flow path 60 has substantially constant physical properties and composition. Can be maintained.

<Fourth embodiment>
Next, the operation of the fourth embodiment will be described with reference to FIG. The ink flowing through the supply channel 61 separates only the gas and liquid that can pass through the membrane from the ink flowing along the gas permeable membrane inside the deaeration module 100 by the pressure reducing action of the negative pressure channel 80, and the separated gas and The liquid is discharged to the separator 82 through the negative pressure flow path 80, and is separated into gas and liquid by the separator 82. At this time, in order to maintain the reduced pressure state of the negative pressure flow path 80, the three-way valve type open / close valve 71 is in a state where the deaeration module 100 and the separator 82 are in communication, the open / close valve 72 is open, and the open / close valve 73 is closed. It has become.

  Next, an operation of collecting the liquid component present in the separator 82 generated by the ink deaeration into the ink tank 15 will be described. First, the on-off valve 72 is closed, and the separator 82 and the negative pressure part 81 are shut off. Next, the on-off valve 73 is opened to bring the separator 82 and the ink tank 15 into communication. Finally, the three-way valve type on-off valve 71 is operated in a state where the deaeration module 100 and the separator 82 are shut off and the atmosphere flows into the separator 82. With this state, the liquid component inside the separator 82 smoothly moves to the outlet channel 84 and is collected in the ink tank 15. When canceling the recovery operation, the valve state is returned in the reverse order to return from the recovery operation state to the deaeration operation state.

  The liquid collected in the ink tank 15 is mixed with the ink in the ink tank 15 and reused. By collecting and mixing the liquid permeated from the degassing module 100 in the supply flow path 61 into the ink tank 15 in the circulation flow path 60 for each ink, the ink in the circulation flow path 60 has substantially constant physical properties and composition. Can be maintained.

<Fifth embodiment>
Next, the operation of the fifth embodiment will be described with reference to FIG. The ink flowing through the supply channel 61 separates only the gas and liquid that can pass through the membrane from the ink flowing along the gas permeable membrane inside the deaeration module 100 by the pressure reducing action of the negative pressure channel 80, and the separated gas and The liquid is discharged to the separator 82 through the negative pressure flow path 80, and is separated into gas and liquid by the separator 82. At this time, in order to maintain the reduced pressure state of the negative pressure flow path 80, the pressurization three-way valve type on-off valve 71 is not in communication with a pressurization source (not shown) in a state where the deaeration module 100 and the separator 82 side are in communication. The on-off valve 72 is open and the on-off valve 73 is closed.

  Next, an operation of collecting the liquid component present in the separator 82 and the negative pressure channel 80 generated by the ink degassing into the ink tank 15 will be described. First, the on-off valve 72 is closed, and the separator 82 and the negative pressure part 81 are shut off. Next, the on-off valve 73 is opened to bring the separator 82 and the ink tank 15 into communication. Finally, the pressurization three-way valve type on-off valve 71 is operated so that the pneumatic flow path 74 and the separator 82 communicate with each other, and is disconnected from the deaeration module 100. In this state, the separator 82 and the negative pressure channel 80 are pressurized in the direction of the outlet channel 84, and the internal liquid is collected in the ink tank 15. When canceling the recovery operation, the valve state is returned in the reverse order to return from the recovery operation state to the deaeration operation state.

  The liquid collected in the ink tank 15 is mixed with the ink in the ink tank 15 and reused. By collecting and mixing the liquid permeated from the degassing module 100 in the supply flow path 61 into the ink tank 15 in the circulation flow path 60 for each ink, the ink in the circulation flow path 60 has substantially constant physical properties and composition. Can be maintained.

<Effect of embodiment>
According to the embodiment, the following effects can be obtained.

  (1) The negative pressure channel 80 is provided with a negative pressure portion 81 and a separator 82, and the separator 82 is provided with a first on-off valve 73. Therefore, the liquid component in the ink separated by the degassing module 100 can be recovered. By further including the third on-off valve 71 and the second on-off valve 72, efficient and reliable recovery can be achieved. Further, the liquid component in the ink can be collected smoothly by introducing the third on-off valve 71 into a three-way valve type and introducing the atmosphere. Accordingly, the composition change of the ink stored in the ink tank 15 can be suppressed.

  (2) In the negative pressure channel 80, a pneumatic channel 74 is provided between the third on-off valve 71 and the second on-off valve 72.

  Therefore, for example, the liquid component in the ink stored in the separator 82 can be forcibly discharged and returned to the ink tank 15. Accordingly, the operation of returning the liquid component in the ink into the ink tank 15 becomes quick and easy.

  (3) In the ink jet recording apparatus 10, the stirring unit 14 is provided in the ink tank 15. Therefore, even when the liquid component in the ink stored in the separator 82 is returned to the ink tank 15 and not mixed well, it can be sufficiently mixed by the stirring unit 14 and adjusted to the ink close to the original state. . The ink supplied from the ink tank 15 to the inkjet head 20 can be adjusted to a component suitable for ejection from the nozzle.

<Modification>
The embodiment can also be performed as follows. Some configurations of the modifications shown below can be appropriately combined and employed. Hereinafter, points different from the above will be described, and description of similar points will be omitted as appropriate.

  (1) Although not described above, the ink jet recording apparatus 10 may be either a serial type or a line type. That is, the circulation channel 60 can be employed regardless of the type of the inkjet recording apparatus 10. When the inkjet recording apparatus 10 is a serial type, the inkjet recording apparatus 10 includes a moving unit that reciprocates the carriage in the main scanning direction. An image is recorded on the recording medium while the carriage is reciprocated in the main scanning direction. When the inkjet recording apparatus 10 is a line type, the plurality of nozzles are arranged in the direction of the width of the recording medium that coincides with the main scanning direction. Serial type or line type ink jet recording apparatuses are already in practical use and both are well known. Therefore, the other description regarding these is abbreviate | omitted.

  (2) The ink tank 15 may be provided with a heating unit. In the inkjet head 20, the heating unit may be omitted. In addition, a heating unit may be provided in any of the circulation channels 60, and the ink flowing in the region may be heated in the region where the heating unit is provided.

(3) Although the circulation channel 60 has been described with respect to the structure for circulating the ink before being ejected from the inkjet head 20, the circulation channel 60 may be configured to collect and circulate the ink after being ejected from the inkjet head 20. The ink ejected from the inkjet head 20 is originally used for image formation, but preliminary ejection for preventing nozzle clogging, test ejection for inspecting which nozzle is clogged, recovery ejection when the nozzle is clogged, etc. Discharging for maintaining quality is generally performed. Ink produced by these discharges can be used effectively without waste.

DESCRIPTION OF SYMBOLS 10 Inkjet recording device, 14 Stirring part, 15 Ink tank 20 Inkjet head,
Reference Signs List 60 Circulating channel, 61 Supply channel 65 Recovery channel 71, 72, 73 On-off valve, 74 Pneumatic channel, 77 Liquid feeding unit 80 Negative pressure channel, 81 Negative pressure unit, 82 Separator, 84 Outlet channel 90 Control device 91 Control unit, 92 CPU, 93 Storage unit, 94 RAM
95 connection interface (connection I / F), 96 power supply 100 deaeration module

Claims (6)

An ink tank for storing ink;
An inkjet head including a nozzle for ejecting the ink;
A circulation flow path through which the ink supplied from the ink tank flows and circulates the ink collected again in the ink tank via the inkjet head;
A liquid feeding section that is provided in the circulation flow path and that causes the ink to flow through the circulation flow path;
A degassing module that removes dissolved gas in the ink, and
A negative pressure part connected to the deaeration module via a negative pressure flow path to bring the deaeration module into a negative pressure state;
A separator provided in the negative pressure flow path,
An inkjet recording apparatus comprising: a first on-off valve in an outlet channel for recovering the liquid stored in the separator.   The inkjet recording apparatus according to claim 1, further comprising a second on-off valve in the negative pressure flow path connecting the separator and the negative pressure portion.   The inkjet recording apparatus according to claim 2, wherein a third on-off valve is provided in the negative pressure channel connecting the deaeration module and the separator.   The second on-off valve and / or the third on-off valve is a three-way valve, or an air release valve is provided in the negative pressure flow path between the second on-off valve and the third on-off valve. The ink jet recording apparatus according to claim 3. The inkjet recording apparatus according to claim 4, wherein the three-way valve and / or the atmosphere release valve is provided with a pneumatic flow path.   The ink jet recording apparatus according to claim 1, wherein the ink tank includes a stirring unit.