Liquid dispensing device

Abstract

To provide a liquid discharge device that can suppress liquid from being supplied from a first storage part to a second storage part due to vibration which is caused during liquid transportation.SOLUTION: The liquid discharge device comprises a first storage part that can store liquid supplied from a liquid storage body, a first atmospheric open passage through which the inside of the first storage part can be opened to an atmosphere, a second storage part that can store liquid supplied from the first storage part, and a second atmospheric open passage through which the inside of the second storage part can be opened to the atmosphere. The liquid discharge device is configured to be able to select a normal mode and a transportation mode. In the normal mode, an electric power source is turned off in a state where the first atmospheric open passage is opened and the second atmospheric open passage is closed. In the transportation mode, the electric power source is turned off in a state where the first atmospheric open passage is opened and the second atmospheric open passage is opened.SELECTED DRAWING: Figure 1

Description

[[Technical Field]]

[0001] The present invention relates to a liquid ejection device. [[Background Art]]

[0002] For example, as disclosed in Patent Document 1, there is a liquid ejection device that ejects liquid from a liquid ejection portion to perform printing on a medium. The liquid ejection device described in Patent Document 1 includes: a first storage portion capable of storing liquid supplied from a liquid container; a second storage portion capable of storing liquid supplied from the first storage portion; and a check valve that allows a liquid flow from the first storage portion toward the second storage portion. The liquid stored in the liquid container is supplied from the first storage portion to the second storage portion, and then supplied from the second storage portion to the liquid ejection portion.

[0003] The liquid ejection device described in Patent Document 1 controls the interior of the first storage portion to be openable to the atmosphere by opening a first atmosphere opening flow path, and controls the interior of the second storage portion to be openable to the atmosphere by opening a second atmosphere opening flow path. [[Prior Art Documents]] [[Patent Documents]]

[0004] [[Patent Document 1]] Japanese Unexamined Patent Publication No. 2022-18221 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0005] However, in such a liquid ejection device, when liquid is stored in the first storage portion, unintentional supply of the liquid from the first storage portion into the second storage portion may occur due to rippling of the liquid in the first storage portion caused by, for example, vibration during transportation. The liquid supplied into the second storage portion cannot flow back to the first storage portion due to the provision of the check valve. As a result, the liquid level in the second storage portion may become higher than expected. [[Means for Solving the Problem]]

[0006] A liquid dispensing device that solves the above problems includes: a first storage section capable of storing liquid supplied from a liquid container; a first atmospheric opening passage that allows the inside of the first storage section to be opened to the atmosphere; a first valve that can open and close the first atmospheric opening passage; a second storage section capable of storing liquid supplied from the first storage section; a second atmospheric opening passage that allows the inside of the second storage section to be opened to the atmosphere; a second valve that can open and close the second atmospheric opening passage; and a mechanism that allows liquid to flow from the first storage section to the second storage section and liquid to flow from the second storage section to the first storage section. The device comprises a check valve for restricting flow and a liquid discharge unit capable of discharging at least the liquid supplied from the second storage unit, and is configured to allow selection between a normal mode and a transport mode. The normal mode is a mode in which the power is turned off with the first atmospheric vent passage open by the first valve and the second atmospheric vent passage open by the second valve, and the transport mode is a mode in which the power is turned off with the first atmospheric vent passage open by the first valve and the second atmospheric vent passage closed by the second valve. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of a liquid dispensing device. [Figure 2] This is a schematic diagram showing the modes of a liquid dispensing device. [Figure 3] This is a flowchart showing the mode control process. [Figure 4] This is a flowchart showing the startup process. [Figure 5] This is a flowchart showing the mode control process. [Figure 6] This is a schematic diagram of a liquid dispensing device. [Figure 7] This is a flowchart showing the startup process. [Figure 8] This is a flowchart showing the startup process. [Figure 9] This is a flowchart showing the startup process. [Figure 10]This is a schematic diagram of a liquid dispensing device. [Figure 11] This is a schematic diagram of a liquid dispensing device. [Modes for carrying out the invention]

[0008] [First Embodiment] An embodiment of the liquid dispensing device will be described below with reference to the drawings. In the drawings, the direction of gravity is indicated by the Z-axis, assuming that the liquid dispensing device is placed on a horizontal plane.

[0009] <Liquid discharge device 11> As shown in Figure 1, the liquid ejection device 11 is configured to print by ejecting liquid onto a medium. The liquid ejection device 11 may be an inkjet printer that prints by ejecting ink as an example of liquid. The medium may be, for example, paper, fabric, vinyl, plastic parts, metal parts, etc. The liquid ejection device 11 may be a multifunction device equipped with a scanner function for reading images.

[0010] <Liquid discharge part 12> The liquid dispensing device 11 includes a liquid dispensing unit 12. The liquid dispensing unit 12 is capable of dispensing liquid. The liquid dispensing unit 12 is configured to perform printing by dispensing liquid onto a medium.

[0011] The liquid dispensing unit 12 includes a liquid dispensing head 13. The liquid dispensing head 13 includes a nozzle surface 14 and a plurality of nozzles 15. Each of the plurality of nozzles 15 is provided to open into the nozzle surface 14. The liquid dispensing head 13 is capable of dispensing liquid from each of the plurality of nozzles 15.

[0012] The liquid ejection unit 12 in this embodiment is of the line type, but it may also be configured as a serial type. In the line type, the liquid ejection head 13 is provided across the width direction of the medium. In the serial type, the liquid ejection head 13 moves in the width direction of the medium while printing is performed.

[0013] The liquid ejection head 13 may include a first connecting portion 16 and a second connecting portion 17. The first connecting portion 16 is connected to a recovery flow path 29 described later. The second connecting portion 17 is connected to a supply flow path 28 described later.

[0014] The liquid ejection head 13 may be arranged such that a nozzle surface 14 assumes an inclined posture inclined with respect to the horizontal. The liquid ejection head 13 may perform printing by ejecting liquid onto a medium in the inclined posture. The first connecting portion 16 may be arranged at a position higher than the second connecting portion 17.

[0015] <Maintenance unit 18> The liquid ejection apparatus 11 includes the maintenance unit 18. The maintenance unit 18 performs maintenance on the liquid ejection head 13. The maintenance may include wiping, flushing, and idle suction. Wiping wipes off liquid adhering to the nozzle surface 14. Flushing is performed by ejecting liquid from each of a plurality of nozzles 15 toward the maintenance unit 18. Idle suction discharges the liquid accumulated in the maintenance unit 18 to a discharge tank (not shown).

[0016] <Supply device 20> The liquid ejection apparatus 11 includes the supply device 20. The supply device 20 is configured to supply the liquid contained in a liquid container 90 to a liquid ejection unit 12. The supply device 20 may be configured to be capable of circulating the liquid from the liquid ejection unit 12.

[0017] The supply device 20 may include one or a plurality of systems of supply mechanisms 21. The plurality of systems of supply mechanisms 21 may each supply different types of liquid to the liquid ejection unit 12. For example, the liquid ejection apparatus 11 may perform color printing by ejecting a plurality of colors of liquid supplied from the plurality of systems of supply mechanisms 21. In the present embodiment, the liquid ejection apparatus 11 performs color printing by ejecting four types of liquid, namely cyan, magenta, yellow, and black, but is not limited thereto. Hereinafter, one system of supply mechanism 21 among the plurality of systems of supply mechanisms 21 will be described as a representative.

[0018] <Tank Unit 22> The supply mechanism 21 includes a tank unit 22. The tank unit 22 is configured to discharge the liquid supplied from the liquid container 90 to the liquid discharge section 12. The tank unit 22 may also include a mounting section 23. The mounting section 23 is configured to allow the liquid container 90 to be attached and detached.

[0019] The liquid container 90 may be mountable on the mounting section 23 to correspond to each of the multiple supply mechanisms 21. The liquid container 90 may include a storage chamber 91. The storage chamber 91 is configured to contain liquid. The storage chamber 91 is a sealed space that is not in communication with the atmosphere. The storage chamber 91 may be capable of containing a larger amount of liquid than the amount of liquid that the supply device 20 can hold.

[0020] The liquid container 90 may include a discharge section 92. The discharge section 92 is configured to discharge the liquid contained in the container chamber 91. The discharge section 92 may include a discharge valve 93. The discharge valve 93 is configured to open when the liquid container 90 is mounted on the mounting section 23. The discharge valve 93 remains open while the liquid container 90 is mounted on the mounting section 23.

[0021] The tank unit 22 includes a first storage section 24. The first storage section 24 is capable of storing liquid supplied from the liquid container 90. The first storage section 24 functions as a sub-tank for temporarily storing liquid.

[0022] The tank unit 22 includes a second storage section 25. The second storage section 25 is capable of storing liquid supplied from the first storage section 24. The second storage section 25 functions as a reservoir tank that temporarily stores the liquid discharged from the first storage section 24 until it is supplied to the liquid discharge section 12.

[0023] The tank unit 22 is equipped with a discharge channel 26. The discharge channel 26 is configured to connect the first storage section 24 and the second storage section 25. In the direction of liquid flow when liquid is supplied from the liquid container 90 to the liquid discharge section 12, the first storage section 24 is located upstream of the second storage section 25.

[0024] The tank unit 22 is equipped with an on / off valve 27. The on / off valve 27 is located in the outlet passage 26. The on / off valve 27 can open and close the outlet passage 26. The on / off valve 27 includes one or more check valves. The check valves allow the flow of liquid from the first storage section 24 to the second storage section 25 and restrict the flow of liquid from the second storage section 25 to the first storage section 24. Thus, the liquid discharge device 11 is equipped with check valves. The on / off valve 27 closes the outlet passage 26 when the pressure in the second storage section 25 is greater than the pressure in the first storage section 24.

[0025] The supply mechanism 21 includes a supply channel 28. The supply channel 28 supplies liquid from the second storage section 25 to the liquid discharge section 12. The upstream end of the supply channel 28 is connected to the second storage section 25, while the downstream end is connected to the second connection section 17.

[0026] The supply mechanism 21 includes a recovery channel 29. The recovery channel 29 recovers liquid from the liquid discharge section 12 to the first storage section 24. The upstream end of the recovery channel 29 is connected to the first connection section 16, while the downstream end is connected to the first storage section 24.

[0027] The supply mechanism 21 includes a first flow path valve 30 and a second flow path valve 31. The first flow path valve 30 is provided in the recovery flow path 29. The first flow path valve 30 can open and close the recovery flow path 29. The second flow path valve 31 is provided in the supply flow path 28. The second flow path valve 31 can open and close the supply flow path 28.

[0028] <Micro-pressure unit 32> The supply mechanism 21 may include a micro-pressurization unit 32. The micro-pressurization unit 32 may be provided in the recovery channel 29 between the liquid discharge section 12 and the first channel valve 30. The micro-pressurization unit 32 pressurizes the liquid in the recovery channel 29. The micro-pressurization unit 32 includes a liquid chamber 33, a flexible member 34, an air chamber 35, and a spring 36. The liquid chamber 33 is provided in the recovery channel 29 between the liquid discharge section 12 and the second channel valve 31. The liquid chamber 33 is configured to accommodate the liquid in the recovery channel 29. Part of the liquid chamber 33 is composed of the flexible member 34. The volume of the liquid chamber 33 changes as the flexible member 34 deforms.

[0029] The flexible member 34 is configured to partition the liquid chamber 33 and the air chamber 35. The flexible member 34 is deformable in response to the pressure from the air chamber 35. The air chamber 35 is configured to be connectable to an air passage 43, which will be described later. The spring 36 is provided inside the air chamber 35. The spring 36 reduces pressure fluctuations of the liquid in the recovery passage 29 and the liquid discharge section 12 by pressing the flexible member 34.

[0030] <Drive mechanism 40> The supply device 20 includes a drive mechanism 40. The drive mechanism 40 drives the supply mechanism 21. More specifically, the drive mechanism 40 drives the tank unit 22 and the micro-pressurization unit 32. The drive mechanism 40 drives multiple supply mechanisms 21 individually, but it may also drive multiple supply mechanisms 21 together.

[0031] The drive mechanism 40 includes a first atmospheric vent passage 41, a second atmospheric vent passage 42, and an air passage 43. The first atmospheric vent passage 41 is connected to the first storage section 24. The first atmospheric vent passage 41 allows the inside of the first storage section 24 to be opened to the atmosphere. The second atmospheric vent passage 42 is connected to the second storage section 25. The second atmospheric vent passage 42 allows the inside of the second storage section 25 to be opened to the atmosphere. The air passage 43 is connected to the micro-pressurization unit 32.

[0032] The drive mechanism 40 may include a switching mechanism 44, a connecting passage 45, a pressurizing unit 46, and a pressure sensor 47. The switching mechanism 44 may be a selector valve that controls the opening and closing of the first atmospheric vent passage 41, the second atmospheric vent passage 42, and the air passage 43. The connecting passage 45 is configured to connect the first atmospheric vent passage 41 and the second atmospheric vent passage 42 to the pressurizing unit 46.

[0033] The pressurizing unit 46 is configured to adjust the pressure of the tank unit 22 and the micro-pressurizing unit 32. The pressurizing unit 46 may be a tube pump that pumps air by rotating a roller that compresses a tube.

[0034] The pressurizing unit 46 is connected to the switching mechanism 44. More specifically, the pressurizing unit 46 has an air passage 43 connected to one end and a connecting passage 45 connected to the other end. When the pressurizing unit 46 is driven in the forward direction, it sends the air taken in from the air passage 43 to the connecting passage 45. When the pressurizing unit 46 is driven in the reverse direction, it reduces the pressure inside the air chamber 35.

[0035] The pressure sensor 47 is connected to the switching mechanism 44. The pressure sensor 47 detects pressure. <Storage Unit 1 24> Now, let's explain the first storage section 24 in detail.

[0036] The first storage section 24 includes a first storage chamber 51. The first storage chamber 51 is configured to store liquid. The first storage section 24 includes an inlet 52. The inlet 52 is an opening through which liquid in the recovery channel 29 flows into the first storage chamber 51. The inlet 52 may also be an opening that supplies the liquid stored in the first storage chamber 51 to the recovery channel 29. The inlet 52 may be located below the center of the first storage chamber 51 in the vertical direction Z, or it may be located so as to penetrate the bottom 51A of the first storage chamber 51. In this way, the first storage chamber 51 communicates with the recovery channel 29 via the inlet 52.

[0037] The first storage section 24 includes an introduction section 53. The introduction section 53 is configured to allow the liquid contained in the liquid container 90, which is mounted on the mounting section 23, to be introduced. The introduction section 53 is provided at the top of the first storage section 24. In this embodiment, the introduction section 53 is provided so as to penetrate the ceiling 51B of the first storage chamber 51. The lower end 53A of the introduction section 53 is located inside the first storage chamber 51 and below the ceiling 51B. The upper end 53B of the introduction section 53 is located outside the first storage chamber 51 and above the ceiling 51B. The introduction section 53 is connected to the outlet section 92 of the liquid container 90 when the liquid container 90 is mounted on the mounting section 23. The lower end 53A of the introduction section 53 may be located below the nozzle surface 14.

[0038] The introduction section 53 is equipped with an introduction valve 54. The introduction valve 54 is configured to open when the liquid container 90 is installed in the mounting section 23. The introduction valve 54 remains open while the liquid container 90 is installed in the mounting section 23. When the liquid container 90 is installed in the mounting section 23, the introduction valve 54 is configured to open before the outlet valve 93. This reduces the risk of liquid leaking from the liquid container 90.

[0039] The first storage unit 24 may be equipped with a liquid level sensor 55. The liquid level sensor 55 detects the amount of liquid stored in the first storage chamber 51. More specifically, the liquid level sensor 55 detects the first liquid level 56 of the liquid stored in the first storage chamber 51. The liquid level sensor 55 may also detect that the first liquid level 56 is at the standard position, that the first liquid level 56 is below the standard position, and that the first liquid level 56 is at the full position.

[0040] In this embodiment, the standard position is located above the inlet 52 in the first storage chamber 51. Therefore, when the first liquid level 56 is at the standard position, the liquid stored in the first storage chamber 51 can be supplied to the liquid discharge section 12 via the recovery channel 29. The full position is a position above the standard position.

[0041] The first storage section 24 may include a first gas-liquid separation membrane 57. The first gas-liquid separation membrane 57 is provided in the ceiling 51B of the first storage chamber 51 at a position separating the first storage chamber 51 from the first atmospheric vent channel 41. The first gas-liquid separation membrane 57 is a membrane that allows gas to pass through but prevents liquid from passing through. The first gas-liquid separation membrane 57 prevents the liquid stored in the first storage chamber 51 from flowing to the drive mechanism 40 via the first atmospheric vent channel 41.

[0042] <Second Storage Section 25> Next, the second storage section 25 will be explained in detail. The second storage section 25 includes a second storage chamber 61. The second storage chamber 61 is configured to store liquid. The second storage section 25 includes a supply port 62. The supply port 62 is an opening that supplies the liquid stored in the second storage chamber 61 to the supply channel 28. The supply port 62 may be located below the center of the second storage chamber 61 in the vertical direction Z, or it may be located so as to penetrate the bottom 61A of the second storage chamber 61. In this way, the second storage chamber 61 communicates with the supply channel 28 via the supply port 62. The second storage section 25 includes a filter 63. The filter 63 is located in the second storage chamber 61. The filter 63 covers the supply port 62.

[0043] The second storage section 25 may include a second gas-liquid separation membrane 64. The second gas-liquid separation membrane 64 is provided in the ceiling 61B of the second storage chamber 61 at a position separating the second storage chamber 61 from the second atmospheric vent channel 42. The second gas-liquid separation membrane 64 is a membrane that allows gas to pass through but prevents liquid from passing through. The second gas-liquid separation membrane 64 prevents the liquid stored in the second storage chamber 61 from flowing to the drive mechanism 40 via the second atmospheric vent channel 42.

[0044] <Liquid supply to tank unit 22> Now, let's explain the supply of liquid to the tank unit 22. When the liquid container 90 is attached to the mounting section 23, the liquid inside the liquid container 90 is supplied to the first storage section 24 due to the difference in water head. Air is introduced from the first storage section 24 to the liquid container 90 via the inlet section 53 and outlet section 92, equal to the amount of liquid supplied from the liquid container 90 to the first storage section 24. The first liquid level 56 rises by the amount of liquid supplied from the liquid container 90 to the first storage section 24.

[0045] When the first liquid level 56 reaches the lower end 53A of the inlet 53, the inflow of air from the first storage section 24 to the liquid container 90 is restricted. Because the storage chamber 91 is sealed, when the inflow of air from the first storage section 24 to the liquid container 90 is restricted, the pressure inside the storage chamber 91 decreases by the amount of liquid supplied to the first storage section 24. When the negative pressure inside the storage chamber 91 becomes greater than the water head of the liquid inside the storage chamber 91, the supply of liquid from the liquid container 90 to the first storage section 24 is restricted.

[0046] Furthermore, when the first storage chamber 51 and the second storage chamber 61 are open to the atmosphere, if the first liquid level 56 is higher than the second liquid level 65 of the liquid in the second storage section 25, the on / off valve 27 opens due to the difference in water head. As a result, the liquid stored in the first storage section 24 is supplied to the second storage section 25 via the outlet channel 26. Then, the second liquid level 65 rises by the amount of the supplied liquid, and the first liquid level 56 falls by the amount of the supplied liquid, so that the second liquid level 65 is at the same height as the first liquid level 56. When the first liquid level 56 and the second liquid level 65 are at the same height, the on / off valve 27 closes. This maintains the first liquid level 56 and the second liquid level 65 at the same height.

[0047] The first liquid level 56 decreases as liquid is supplied from the first storage section 24 to the second storage section 25. As the first liquid level 56 decreases and air flows into the containment chamber 91 via the inlet 53 and outlet 92, the negative pressure inside the containment chamber 91 decreases. When the negative pressure inside the containment chamber 91 becomes less than the water head of the liquid inside the containment chamber 91, liquid is supplied from the liquid container 90 to the first storage section 24. Therefore, as long as liquid is contained in the liquid container 90, the first liquid level 56 is maintained at a standard position near the lower end 53A of the inlet 53. The second liquid level 65 is also at the same height as the first liquid level 56 and is maintained at a standard position.

[0048] As a result, the first liquid level 56 and the second liquid level 65 fluctuate within a range lower than the nozzle surface 14. The liquid in the liquid discharge head 13 is maintained at a negative pressure due to the head difference between it and the liquid in the first storage section 24 and the second storage section 25. When liquid is consumed in the liquid discharge head 13, the liquid stored in the second storage section 25 is supplied to the liquid discharge head 13.

[0049] <Switching mechanism 44> Next, we will explain the switching mechanism 44 in detail. The switching mechanism 44 includes a narrow tube section 48. The narrow tube section 48 is provided in the connecting channel 45. The narrow tube section 48 is a narrow and meandering tube such that the flow of liquid is greatly restricted by the flow of air.

[0050] The switching mechanism 44 comprises a plurality of selector valves 49. More specifically, the switching mechanism 44 comprises a first selector valve 49A to an eleventh selector valve 49K. Each of the plurality of selector valves 49A to 49K is configured to open and close a flow path.

[0051] The first selector valve 49A, when opened, connects the air passage 43 to the atmosphere. The second selector valve 49B, when opened, connects the air passage 43 to the pressure sensor 47. The third selector valve 49C, when opened, opens the air passage 43 and connects the pressurizing section 46 to the air chamber 35.

[0052] The fourth selector valve 49D opens to connect the connecting passage 45 between the pressurizing section 46 and the eighth selector valve 49H to the atmosphere. The fifth selector valve 49E opens to connect the connecting passage 45 to the pressure sensor 47. The sixth selector valve 49F and the seventh selector valve 49G open to connect the connecting passage 45 to the atmosphere. The eighth selector valve 49H opens to open the connecting passage 45. The ninth selector valve 49I opens to connect the narrow tube section 48 to the atmosphere. The tenth selector valve 49J opens to open the first atmospheric vent passage 41, connecting the first storage section 24 to the connecting passage 45. The eleventh selector valve 49K opens to open the second atmospheric vent passage 42, connecting the second storage section 25 to the connecting passage 45.

[0053] When changing the pressure in the air chamber 35, the switching mechanism 44 opens the second selector valves 49B to the fourth selector valves 49D and closes the other selector valves. When the pressurizing unit 46 is driven forward in this state, the air in the air chamber 35 is discharged through the air passage 43 and the connecting passage 45, and the pressure in the air chamber 35 decreases. When the pressurizing unit 46 is driven in reverse in this state, or when the air passage 43 and the air chamber 35 are opened to the atmosphere, air is supplied to the air chamber 35 through the connecting passage 45 and the air passage 43, or through the air passage 43, and the pressure in the air chamber 35 increases. At this time, the pressure sensor 47 may detect the pressure in the air passage 43 and the air chamber 35.

[0054] When the first storage section 24 is opened to the atmosphere, the switching mechanism 44 opens the sixth selector valve 49F and the tenth selector valve 49J. The first storage chamber 51 communicates with the atmosphere via the first atmospheric opening passage 41 and the connecting passage 45. In this way, the sixth selector valve 49F and the tenth selector valve 49J can open and close the first atmospheric opening passage 41.

[0055] When the second storage section 25 is opened to the atmosphere, the switching mechanism 44 opens the seventh selector valve 49G and the eleventh selector valve 49K. The second storage chamber 61 communicates with the atmosphere via the second atmospheric opening passage 42 and the connecting passage 45. In this way, the seventh selector valve 49G and the eleventh selector valve 49K can open and close the second atmospheric opening passage 42.

[0056] In this embodiment, the sixth selector valve 49F and the tenth selector valve 49J correspond to an example of the first valve. In this embodiment, the seventh selector valve 49G and the eleventh selector valve 49K correspond to an example of the second valve.

[0057] When pressurizing the first storage section 24, the switching mechanism 44 opens the first selector valve 49A, the fifth selector valve 49E, the eighth selector valve 49H, and the tenth selector valve 49J, and closes the other selector valves. When the pressurizing section 46 is driven forward in this state, air flows into the first storage chamber 51 via the air passage 43, the connecting passage 45, and the first atmospheric release passage 41, and the pressure inside the first storage chamber 51 increases. At this time, the pressure sensor 47 may detect the pressure inside the connecting passage 45, the first atmospheric release passage 41, and the first storage chamber 51.

[0058] When pressurizing the second storage section 25, the switching mechanism 44 opens the first selector valve 49A, the fifth selector valve 49E, the eighth selector valve 49H, and the eleventh selector valve 49K, and closes the other selector valves. When the pressurizing section 46 is driven forward in this state, air flows into the second storage chamber 61 via the air passage 43, the connecting passage 45, and the second atmospheric release passage 42, and the pressure inside the second storage chamber 61 increases. At this time, the pressure sensor 47 may detect the pressure inside the connecting passage 45, the second atmospheric release passage 42, and the second storage chamber 61.

[0059] <Control Unit 70> The liquid dispensing device 11 includes a control unit 70. The control unit 70 controls various operations performed by the liquid dispensing device 11. The control unit 70 may be configured as a circuit including α: one or more processors that perform various processes according to a computer program, β: one or more dedicated hardware circuits that perform at least some of the various processes, or γ: a combination thereof. The hardware circuit is, for example, an application-specific integrated circuit. The processor includes a CPU and memory such as RAM and ROM, and the memory stores program code or instructions configured to cause the CPU to perform processes. Memory, or computer-readable media, includes any readable media that can be accessed by a general-purpose or dedicated computer.

[0060] The liquid dispensing device 11 may include a display unit 71 and an operation unit 72. The display unit 71 is configured to display information related to the liquid dispensing device 11. The operation unit 72 is configured to be operable by users and service personnel. The operation unit 72 is used for operations related to the liquid dispensing device 11, such as a touch panel.

[0061] The control unit 70 controls the liquid discharge unit 12. The control unit 70 controls the opening and closing of the first flow path valve 30 and the second flow path valve 31. The control unit 70 receives a detection signal from the liquid level sensor 55 indicating the detection result of the liquid level sensor 55. The control unit 70 controls the switching mechanism 44 and the pressurizing unit 46. The control unit 70 receives a detection signal from the pressure sensor 47 indicating the detection result of the pressure sensor 47. The control unit 70 displays information on the display unit 71. The control unit 70 receives an operation signal from the operation unit 72 based on the operation of the operation unit 72.

[0062] <Functions of the Control Unit> When liquid is being filled, the control unit 70 closes the first flow valve 30 and the second flow valve 31, opening the first storage section 24 and the second storage section 25 to the atmosphere. As a result, liquid is supplied from the liquid container 90 attached to the mounting section 23 to the first storage section 24, filling the first storage section 24 with liquid. Then, liquid is supplied from the first storage section 24 to the second storage section 25, filling the second storage section 25 with liquid.

[0063] When printing is performed by the liquid dispensing device 11, the control unit 70 opens the first flow path valve 30 and the second flow path valve 31, opening the first storage section 24 and the second storage section 25 to the atmosphere. As a result, during printing, liquid is supplied from the second storage section 25 to the liquid dispensing section 12 via the supply flow path 28, and liquid is also supplied from the first storage section 24 to the liquid dispensing section 12 via the recovery flow path 29. The control unit 70 may also close the first flow path valve 30 when printing is performed by the liquid dispensing device 11. In this way, the liquid dispensing section 12 is capable of dispensing at least the liquid supplied from the second storage section 25.

[0064] The control unit 70 may close the first flow path valve 30 and the second flow path valve 31 when printing is not being performed by the liquid dispensing device 11. By closing the supply flow path 28 and the recovery flow path 29 in this way, it is possible to suppress liquid leakage from the liquid dispensing head 13 even if, for example, vibration or shock is applied to the liquid dispensing device 11.

[0065] The control unit 70 is capable of performing liquid circulation. Liquid circulation may be performed, for example, during standby when no printing is taking place, or during printing. When liquid circulation is performed, the control unit 70 opens the first flow path valve 30 and the second flow path valve 31, opening the first storage section 24 to the atmosphere and pressurizing the second storage section 25. As a result, during liquid circulation, liquid is supplied from the second storage section 25 to the liquid discharge section 12 via the supply flow path 28, and liquid is recovered from the liquid discharge section 12 to the first storage section 24 via the recovery flow path 29.

[0066] The control unit 70 is capable of performing pressurized discharge. Pressurized discharge is performed when a discharge failure occurs, for example. A discharge failure is a failure in which liquid cannot be discharged normally from each of the multiple nozzles 15. When pressurized discharge is performed, the control unit 70 closes the first flow path valve 30, opens the second flow path valve 31, and pressurizes the second storage section 25. As a result, during pressurized discharge, liquid can be discharged from each of the multiple nozzles 15 via the second storage section 25 and the supply flow path 28.

[0067] The control unit 70 is capable of performing slightly pressurized discharge. When slightly pressurized discharge is performed, the control unit 70 opens the first flow path valve 30 and the second flow path valve 31, reducing the pressure inside the air chamber 35. Then, after closing the first flow path valve 30 and the second flow path valve 31, the control unit 70 opens the air chamber 35 to the atmosphere. As a result, during slightly pressurized discharge, liquid can be discharged from each of the multiple nozzles 15 via the slightly pressurized unit 32 and the recovery flow path 29. The amount of liquid discharged from the liquid discharge head 13 by slightly pressurized discharge is less than the amount of liquid discharged from the liquid discharge head 13 by pressurized discharge.

[0068] The control unit 70 may determine that the liquid container 90 is empty when the liquid level sensor 55 detects that the first liquid level 56 is below the standard position, and may instruct the user to replace the liquid container 90.

[0069] <Selection section> The control unit 70 includes a selection unit 70A. The selection unit 70A is configured to select the mode of the liquid dispensing device 11. The modes include a normal mode and a transport mode. In other words, the selection unit 70A is configured to select between the normal mode and the transport mode.

[0070] The transport mode is a mode different from the normal mode. The transport mode is set when transporting the liquid dispensing device 11, for example, when transporting the product by vehicle while the tank unit 22 is filled with liquid.

[0071] As shown in Figure 2, the normal mode is a mode in which the power is turned off with the first atmospheric vent channel 41 open and the second atmospheric vent channel 42 open. On the other hand, the transport mode is a mode in which the power is turned off with the first atmospheric vent channel 41 open to the atmosphere and the second atmospheric vent channel 42 closed without being opened to the atmosphere.

[0072] <Control Processing> The control process for the liquid dispensing device 11 will now be described. The order of each control process can be arbitrarily rearranged as long as it does not deviate from the purpose of each control process.

[0073] <Mode control processing> First, the mode control process will be explained with reference to Figure 3. The mode control process is a process that is executed at predetermined intervals in the control unit 70.

[0074] As shown in Figure 3, in step S11, the control unit 70 determines whether or not a transport mode selection instruction has been given based on the operation signal from the operation unit 72. The transport mode selection instruction may be given, for example, in response to the operation of the operation unit 72 by a user or service technician. If the control unit 70 determines that no transport mode selection instruction has been given, it proceeds to step S15 without executing steps S12 to S14. In this case, the control unit 70 maintains the normal mode without controlling to a transport mode. On the other hand, if the control unit 70 determines that a transport mode selection instruction has been given, it proceeds to step S12. The control unit 70 that performs such processing functions as the selection unit 70A.

[0075] In step S12, the control unit 70 stores information indicating the transport mode in the non-volatile memory and sets it to transport mode. Then, in step S13, the control unit 70 performs a closing operation to close the 7th selector valve 49G and the 11th selector valve 49K, thereby closing the 2nd atmospheric vent passage 42. In this way, when the transport mode is selected, the control unit 70 closes the 2nd atmospheric vent passage 42 using the 7th selector valve 49G and the 11th selector valve 49K.

[0076] In this embodiment, the sixth selector valve 49F and the tenth selector valve 49J are open, and the first atmospheric vent passage 41 is open to the atmosphere. Thus, the control unit 70 controls the system from a normal mode in which the first atmospheric vent passage 41 is open to the atmosphere and the second atmospheric vent passage 42 is open to the atmosphere, to a transport mode in which the first atmospheric vent passage 41 is open to the atmosphere and the second atmospheric vent passage 42 is closed without being opened to the atmosphere.

[0077] Next, in step S14, the control unit 70 displays handling information on the display unit 71. The handling information may include information prompting the user to remove the liquid container 90 from the mounting unit 23. The handling information may also include information prompting the user to turn off the power. Thus, when the transport mode is selected, the control unit 70 displays on the display unit 71 information prompting the user to remove the liquid container 90 from the mounting unit 23 and information prompting the user to turn off the power.

[0078] In step S15, the control unit 70 determines whether or not a power-off instruction has been given based on the operation signal from the power button (not shown). If the control unit 70 determines that a power-off instruction has been given, it turns off the power in step S16. On the other hand, if the control unit 70 determines that no power-off instruction has been given, it terminates the mode control process.

[0079] <Startup Processing> Next, we will explain the startup process with reference to Figure 4. The startup process is the process that is executed when the power is turned on from off.

[0080] As shown in Figure 4, in step S21, the control unit 70 performs an initial setup process to perform the initial setup of the liquid dispensing device 11. Then, in step S22, the control unit 70 reads information about the mode from the non-volatile memory and determines whether or not a transport mode is set. If the control unit 70 determines that no transport mode is set, it terminates the startup process without executing step S23. On the other hand, if the control unit 70 determines that a transport mode is set, it proceeds to step S23.

[0081] In step S23, the control unit 70 opens the seventh selector valve 49G and the eleventh selector valve 49K, performing an opening operation to open the second atmospheric vent passage 42 to the atmosphere. In this way, when the power is turned on from off after the transport mode is selected, the control unit 70 performs an opening operation to open the second atmospheric vent passage 42 using the seventh selector valve 49G and the eleventh selector valve 49K. In this embodiment, the first atmospheric vent passage 41 remains open to the atmosphere. When this process is completed, the control unit 70 terminates the startup process.

[0082] <Operation of the First Embodiment> The operation of the first embodiment will now be described. In the liquid dispensing device 11, when liquid is stored in the tank unit 22, the first storage section 24 must be opened to the atmosphere. This is to prevent the inside of the liquid container 90 from becoming pressurized even if the air inside the liquid container 90 expands due to temperature and pressure changes. Also, when the liquid container 90 is attached to the mounting section 23, liquid is supplied from the liquid container 90 to the first storage section 24. As a result, liquid is stored in the first storage section 24.

[0083] Thus, when liquid is stored in the first storage section 24, if the first liquid level 56 undulates due to vibrations during transport, the first liquid level 56 may fall below the lower end 53A of the introduction section 53. In such a situation, the difference in water head causes liquid from the liquid container 90 to be supplied to the first storage section 24. As a result, the first liquid level 56 rises.

[0084] In particular, if the first storage section 24 is open to the atmosphere, atmospheric pressure is applied to the first storage section 24 regardless of the height of the first liquid level 56. As a result, the first liquid level 56 in the first storage section 24 undulates due to vibrations during transport, and each time the first liquid level 56 falls below the lower end 53A of the inlet section 53, the liquid from the liquid container 90 continues to be supplied to the first storage section 24.

[0085] On the other hand, even if the first liquid level 56 is disturbed by vibrations during transport, if the first liquid level 56 is not located below the lower end 53A of the introduction section 53, the liquid in the liquid container 90 will not be supplied to the first storage section 24.

[0086] When the first liquid level 56 becomes wavy due to vibrations during transport, the difference in water head causes the on / off valve 27 to open, and the liquid from the first storage section 24 is supplied to the second storage section 25 via the outlet channel 26. In particular, in normal mode, both the first storage section 24 and the second storage section 25 are open to the atmosphere. As a result, even if there is a difference between the first liquid level 56 and the second liquid level 65, the atmospheric pressure inside the first storage section 24 and the second storage section 25 is the same. Therefore, every time the first liquid level 56 undulates due to vibrations during transport, etc., the liquid in the first storage section 24 is continuously supplied to the second storage section 25. Furthermore, since an on / off valve 27 is provided in the outlet channel 26, the liquid in the second storage section 25 is not supplied to the first storage section 24, and the second liquid level 65 becomes higher than the first liquid level 56, potentially reaching the second gas-liquid separation membrane 64.

[0087] Furthermore, while the first storage unit 24 is equipped with a liquid level sensor 55, and the height of the first liquid level 56 can be detected when the power is on, the second storage unit 25 is not equipped with a liquid level sensor, and therefore the height of the second liquid level 65 cannot be detected. Also, even if the height of the first liquid level 56 can be detected, the second liquid level 65 is not at the same height as the first liquid level 56. For this reason, if liquid is supplied to the liquid discharge head 13 when the second liquid level 65 is high, there is a risk that an excessive water head will be applied to the liquid discharge head 13.

[0088] Therefore, a transport mode is provided that can be set when it is anticipated that the liquid level inside the tank unit 22 will fluctuate during transport. In transport mode, the inside of the second storage section 25 is closed and not open to the atmosphere. Then, due to vibrations during transport, the first liquid level 56 fluctuates, and some of the liquid from the first storage section 24 is supplied to the second storage section 25.

[0089] However, since the air in the second storage section 25 is not supplied to the first storage section 24, the pressure in the second storage section 25 increases. As a result, when the second liquid level 65 reaches a certain height, the pressure in the second storage section 25 becomes higher than the pressure in the first storage section 24, and the on / off valve 27 does not open, preventing the liquid from the first storage section 24 from being supplied to the second storage section 25. This allows the rise in the second liquid level 65 to be suppressed when the transport mode is selected in cases where the liquid level in the tank unit 22 is expected to fluctuate, such as during transport.

[0090] <Effects of the First Embodiment> The effects of the first embodiment will be described. (1-1) By selecting the transport mode, the second atmospheric vent channel 42 can be closed. This allows liquid to be supplied from the first storage section 24 to the second storage section 25 due to vibrations during transport, etc., by making the pressure in the second storage section 25 higher than the pressure in the first storage section 24, thereby stopping the supply of liquid from the first storage section 24 to the second storage section 25. Therefore, it is possible to suppress the supply of liquid from the first storage section 24 to the second storage section 25 due to vibrations during transport, etc.

[0091] (1-2) In addition, the first atmospheric outlet channel 41 can be opened both when the normal mode is selected and when the transport mode is selected. This makes it possible to suppress pressurization inside the liquid container 90 even when the air inside the liquid container 90 expands due to temperature and pressure changes.

[0092] (1-3) When the transport mode is selected, the second atmospheric vent channel 42 can be closed, and the operator can be made aware that the power is being turned off, while also being given the opportunity to turn off the power at the timing intended by the operator. Therefore, the convenience of the operator can be improved.

[0093] (1-4) When the transport mode is selected, the second atmospheric vent channel 42 can be closed, and the operator can be made aware that the liquid container 90 is being removed, while also being given the opportunity to turn off the power at the timing intended by the operator. Therefore, the convenience of the operator can be improved.

[0094] (1-5) When the power is turned on from off after the transport mode has been selected, even if the second atmospheric vent channel 42 is closed, the opening operation can be performed to open the second atmospheric vent channel 42. Therefore, the convenience of the operator can be improved.

[0095] [Second Embodiment] Next, a second embodiment will be described. In the following description, the same reference numerals will be used for components that have already been described in the embodiments, and redundant explanations will be omitted or simplified.

[0096] <Mode control processing> As shown in Figure 5, in the second embodiment, when step S13 is completed, in step S16, the control unit 70 may turn off the power regardless of whether or not a power-off instruction has been given. In this way, when the transport mode is selected, the control unit 70 may turn off the power after closing the second atmospheric ventilation channel 42.

[0097] <Effects of the second embodiment> The effects of the second embodiment will now be described. (2-1) When the transport mode is selected, the second atmospheric vent channel 42 can be closed and the power can be turned off. Therefore, the convenience of the operator can be improved.

[0098] [Third Embodiment] Next, a third embodiment will be described. <Drive mechanism 40> As shown in Figure 6, the drive mechanism 40 includes a switching operation unit 73. The switching operation unit 73 is configured to be operable by operators such as users and service personnel. The switching operation unit 73 can manually switch the open / closed state of the seventh selector valve 49G and the eleventh selector valve 49K. In other words, the switching operation unit 73 can manually switch the open / closed state of the second valve. Furthermore, the seventh selector valve 49G and the eleventh selector valve 49K do not necessarily have to be configured as selector valves.

[0099] The drive mechanism 40 includes a detection unit 74. The detection unit 74 is configured to detect the open / closed state of the seventh selector valve 49G and the eleventh selector valve 49K. In other words, the detection unit 74 can detect the open / closed state of the second atmospheric vent passage 42 by detecting the open / closed state of the second valve. The control unit 70 receives a detection signal from the detection unit 74 indicating the detection result of the detection unit 74.

[0100] <Startup Processing> As shown in Figure 7, in the startup process, when step S21 is completed, in step S24, the control unit 70 determines whether the seventh selector valve 49G and the eleventh selector valve 49K, which are the second valves, are closed or not, based on the detection signal from the detection unit 74.

[0101] If the control unit 70 determines that the seventh selector valve 49G and the eleventh selector valve 49K are not closed, it terminates the startup process without executing step S25. On the other hand, if the control unit 70 determines that at least one of the seventh selector valve 49G and the eleventh selector valve 49K is closed, it proceeds to step S25.

[0102] In step S25, the control unit 70 displays notification information on the display unit 71. The notification information may include information indicating that at least one of the seventh selector valve 49G and the eleventh selector valve 49K is closed. The notification information may also include information indicating that the seventh selector valve 49G and the eleventh selector valve 49K are to be opened.

[0103] Thus, when the power is switched from off to on, if the detection unit 74 detects that the second atmospheric vent channel 42 is closed, the control unit 70 displays information that the second atmospheric vent channel 42 is closed on the display unit 71. Once this process is complete, the control unit 70 terminates the startup process.

[0104] <Effects of the Third Embodiment> The effects of the third embodiment will be described. (3-1) Even if the transport mode is not selected before the power is turned off, the second atmospheric vent channel 42 can be closed by manually switching the switching operation unit 73 after the power is turned off, without having to turn the power back on. Therefore, the convenience of the operator can be improved.

[0105] (3-2) When the power is switched from off to on, even if the second atmospheric vent channel 42 is closed, the operator can be made aware that the second atmospheric vent channel 42 is closed. Therefore, the convenience of the operator can be improved.

[0106] [Fourth Embodiment] Next, a fourth embodiment will be described. <Startup Processing> As shown in Figure 8, in the startup process, if the control unit 70 determines in step S24 that at least one of the seventh selector valve 49G and the eleventh selector valve 49K is closed, the process may proceed to step S23. In step S23, the control unit 70 opens the seventh selector valve 49G and the eleventh selector valve 49K, performing an opening operation to open the second atmospheric opening passage 42 to the atmosphere.

[0107] Thus, when the power is switched from off to on, if the detection unit 74 detects that the second atmospheric vent passage 42 is closed, the control unit 70 performs an opening operation to open the second atmospheric vent passage 42 using the seventh selector valve 49G and the eleventh selector valve 49K. Once this process is complete, the control unit 70 terminates the startup process.

[0108] <Effects of the 4th Embodiment> The effects of the fourth embodiment will be described. (4-1) Even if the second atmospheric vent channel 42 is closed when the power is turned from off to on, the second atmospheric vent channel 42 can be opened by performing an opening operation. Therefore, the convenience of the operator can be improved.

[0109] [Fifth Embodiment] Next, a fifth embodiment will be described. <Startup Processing> As shown in Figure 9, in the startup process, when step S21 is completed, in step S23, the control unit 70 may open the seventh selector valve 49G and the eleventh selector valve 49K, thereby opening the second atmospheric vent passage 42 to the atmosphere. In other words, each time the power is turned from off to on, the control unit 70 may open the second atmospheric vent passage 42 using the seventh selector valve 49G and the eleventh selector valve 49K. When this process is completed, the control unit 70 terminates the startup process.

[0110] <Effects of the Fifth Embodiment> The effects of the fifth embodiment will now be described. (5-1) When the power is switched from off to on, the second atmospheric vent channel 42 can be opened regardless of whether it is closed or not. Therefore, the convenience of the operator can be improved.

[0111] [Sixth Embodiment] Next, a sixth embodiment will be described. <Micro-pressure unit 32> As shown in Figure 10, in the sixth embodiment, the micro-pressure unit 32 may be provided integrally with the second storage section 25. In other words, the liquid chamber 33 in the first embodiment may be configured to communicate with the second storage chamber 61.

[0112] In this case, when a slight pressurized discharge is performed, the control unit 70 closes the first flow path valve 30 and the second flow path valve 31, opens the second storage section 25 to the atmosphere, and then depressurizes the air chamber 35. Then, the control unit 70 closes the second storage section 25 from the atmosphere, opens the second flow path valve 31, and then opens the air chamber 35 to the atmosphere. As a result, during slight pressurized discharge, liquid can be discharged from each of the multiple nozzles 15 via the slight pressurization unit 32 and the supply flow path 28.

[0113] In this way, by placing the micro-pressure unit 32 upstream of the second flow channel valve 31, the second flow channel valve 31 can be sandwiched between the micro-pressure unit 32 and the liquid discharge head 13 in the supply channel 28. This makes it possible to suppress the drawing in of air bubbles and foreign matter from each of the multiple nozzles 15 when the pressure inside the air chamber 35 is reduced during micro-pressure discharge.

[0114] Furthermore, the micro-pressure unit 32 is provided between the second storage section 25 and the liquid discharge section 12, rather than between the first storage section 24 and the liquid discharge section 12. This prevents the on / off valve 27 from sticking to the surrounding wall when the air chamber 35 is depressurized during micro-pressure discharge, allowing for a smooth supply of liquid from the first storage section 24 to the second storage section 25.

[0115] In addition, when the air chamber 35 is depressurized during the slight pressurized discharge, liquid can be drawn from the first storage section 24 to the second storage section 25, thereby preventing the first gas-liquid separation membrane 57 from being wetted by the liquid stored in the first storage chamber 51. This allows for smooth filling of the first storage chamber 51 with liquid, for example, during liquid filling and flushing. Furthermore, liquid can be smoothly supplied from the first storage section 24 to the second storage section 25.

[0116] Furthermore, in the first embodiment, the switching mechanism 44 is equipped with a narrow tube section 48 in order to slowly flex the flexible member 34, but in the sixth embodiment, the switching mechanism 44 does not need to be equipped with a narrow tube section 48. This makes it possible to improve the driving speed of the micro-pressure unit 32.

[0117] [Seventh Embodiment] Next, a seventh embodiment will be described. <Micro-pressure unit 32> As shown in Figure 11, in the seventh embodiment, the micro-pressure unit 32 may be provided between the supply port 62 and the second flow path valve 31. In other words, the micro-pressure unit 32 may be provided in the supply flow path 28 between the second storage section 25 and the second flow path valve 31. Alternatively, the micro-pressure unit 32 may be provided separately from the second storage section 25. Also, in the seventh embodiment, as in the sixth embodiment, the switching mechanism 44 does not need to have a narrow tube section 48. The seventh embodiment also provides similar effects to the sixth embodiment.

[0118] [Example of changes] This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0119] In the above embodiment, if the first liquid level 56 is at the full position, a process to lower the first liquid level 56 may be performed. For example, the control unit 70 opens the second flow path valve 31 and pressurizes the second storage unit 25. As a result, the liquid stored in the second storage unit 25 is supplied to the liquid discharge unit 12 via the supply flow path 28. Then, a predetermined amount of liquid is discharged from each of the multiple nozzles 15 in the liquid discharge unit 12. After that, the control unit 70 stops pressurizing by the pressurizing unit 46 and opens the second storage unit 25 to the atmosphere. In this case, the on / off valve 27 opens due to the difference in water head, and liquid is supplied from the first storage unit 24 to the second storage unit 25. In this way, the control unit 70 repeatedly performs this process until the liquid level sensor 55 no longer detects that the first liquid level 56 is at the full position. This makes it possible to lower the first liquid level 56.

[0120] In the first embodiment, for example, the control unit 70 may not close the second atmospheric vent channel 42 when a transport mode selection instruction is given, but may close the second atmospheric vent channel 42 when a power-off instruction is given.

[0121] In the first embodiment, for example, the control unit 70 may turn off the power if a power-off instruction is not given after a predetermined time has elapsed since the instruction to select a transport mode was given.

[0122] In the second embodiment, for example, when a transport mode selection instruction is given, the control unit 70 may display information on the display unit 71 prompting the user to remove the liquid container 90 from the mounting unit 23 as handling information, and then turn off the power.

[0123] In the third embodiment, for example, the control unit 70 may wait for operator instructions when the power is turned on from off, and display notification information on the display unit 71 in response to the operator's instructions. The operator's instructions may be instructions to display notification information, or instructions based on any operation. Any operation includes operations to perform printing, operations to perform maintenance on the liquid ejection head 13, etc.

[0124] In the above embodiment, for example, the control unit 70 may wait for an operator's instruction when the power is turned on from off, and perform an opening operation to open the second atmospheric ventilation channel 42 upon the operator's instruction. The operator's instruction may be an instruction to perform an opening operation, or an instruction based on any operation.

[0125] In the above embodiment, for example, the control unit 70 may be controlled from transport mode to normal mode by the operator's operation. In other words, it is sufficient that the control unit 70 can be controlled to at least transport mode by the operator's operation.

[0126] In the above embodiment, an ink cartridge capable of containing liquid is used as the liquid container 90, but it is not limited to this, and for example, an ink tank capable of containing liquid may be used. When an ink tank is used as the liquid container 90, the liquid dispensing device 11 is equipped with an ink tank that can be refilled with liquid.

[0127] The liquid ejection head 13 may eject liquid and print onto the medium in a horizontal position where the nozzle surface 14 is horizontal. The liquid ejection head 13 may be provided so as to be able to change between a horizontal position and an inclined position.

[0128] The liquid discharge device 11 may also include a separate flow path for opening the first storage section 24 to the atmosphere and a separate flow path for pressurizing the first storage section 24. The liquid discharge device 11 may also include a separate flow path for opening the second storage section 25 to the atmosphere and a separate flow path for pressurizing the second storage section 25.

[0129] The pressurizing section 46 may use a diaphragm pump, a piston pump, or a gear pump. The flexible member 34 may be formed from a rubber film, an elastomer film, a film, or the like.

[0130] The liquid dispensing device 11 may be a liquid dispensing device that sprays or dispenses liquids other than ink. The state of the liquid dispensed from the liquid dispensing device as minute droplets may include granular, teardrop-shaped, or thread-like forms. The liquid referred to here may be any material that can be dispensed from the liquid dispensing device. For example, the liquid may be any state in which a substance is in the liquid phase, and may include highly or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and other fluids. The liquid may include not only liquids as a state of matter, but also functional material particles consisting of solids such as pigments and metal particles dissolved, dispersed, or mixed in a solvent. Typical examples of liquids include inks and liquid crystals as described in the above embodiments. Here, ink refers to general water-based inks and oil-based inks, as well as various liquid compositions such as gel inks and hot-melt inks. Specific examples of liquid dispensing devices include devices that dispense liquids containing materials such as electrode materials and colorants in the form of dispersion or dissolution, used in the manufacture of liquid crystal displays, electroluminescent displays, surface-emitting displays, and color filters. Liquid dispensing devices may also be devices that dispense bio-organic substances used in biochip manufacturing, devices that dispense liquid samples used as precision pipettes, printing devices, microdispensers, etc. Liquid dispensing devices may also be devices that dispense lubricating oil to precision machinery such as watches and cameras with pinpoint accuracy, or devices that dispense transparent resin liquids such as ultraviolet-curing resins onto substrates to form minute hemispherical lenses, optical lenses, etc. used in optical communication elements. Liquid dispensing devices may also be devices that dispense etching solutions such as acids or alkalis to etch substrates.

[0131] As used herein, the expression "at least one of" means one or more of the desired options. For example, as used herein, if there are two options, the expression "at least one of" means either one option or both of the two options. As another example, as used herein, if there are three or more options, the expression "at least one of" means either one option or any combination of two or more options.

[0132] [Note] The technical concepts and their effects that can be understood from the embodiments and modifications described above are described below.

[0133] (A) The liquid dispensing device includes a first storage section capable of storing liquid supplied from a liquid container, a first atmospheric opening passage that allows the inside of the first storage section to be opened to the atmosphere, a first valve that can open and close the first atmospheric opening passage, a second storage section capable of storing liquid supplied from the first storage section, a second atmospheric opening passage that allows the inside of the second storage section to be opened to the atmosphere, a second valve that can open and close the second atmospheric opening passage, and a device that allows the flow of liquid from the first storage section to the second storage section and restricts the flow of liquid from the second storage section to the first storage section. The system comprises a check valve and a liquid discharge unit capable of discharging at least the liquid supplied from the second storage unit, and is configured to allow selection between a normal mode and a transport mode, wherein the normal mode is a mode in which the power is turned off with the first atmospheric vent passage open by the first valve and the second atmospheric vent passage open by the second valve, and the transport mode is a mode in which the power is turned off with the first atmospheric vent passage open by the first valve and the second atmospheric vent passage closed by the second valve.

[0134] With this configuration, the second atmospheric vent channel can be closed by selecting the transport mode. This allows the supply of liquid from the first storage unit to the second storage unit to be stopped even when vibrations during transport cause liquid to be supplied from the first storage unit to the second storage unit, by making the pressure in the second storage unit higher than the pressure in the first storage unit. Therefore, the supply of liquid from the first storage unit to the second storage unit due to vibrations during transport can be suppressed.

[0135] (B) The liquid dispensing device may further include a selection unit that allows the transport mode to be selected. With this configuration, by selecting the transport mode, it is possible to suppress the supply of liquid from the first storage unit to the second storage unit due to vibrations during transport, etc.

[0136] (C) The liquid dispensing device further comprises a control unit and a display unit capable of displaying information, and when the transport mode is selected by the selection unit, the control unit may close the second atmospheric venting channel with the second valve and display information prompting the power off on the display unit.

[0137] This configuration allows the second atmospheric vent channel to be closed when the transport mode is selected, and also provides the operator with the opportunity to turn off the power at their desired timing while still making them aware that the power is being turned off. Therefore, operator convenience can be improved.

[0138] (D) The liquid dispensing device further comprises a control unit, and when the transport mode is selected by the selection unit, the control unit may close the second atmospheric outlet passage with the second valve and then turn off the power.

[0139] With this configuration, when the transport mode is selected, the second atmospheric vent channel can be closed and the power can be turned off. Therefore, the convenience of the operator can be improved.

[0140] (E) In the liquid dispensing device, when the power is turned on from off after the transport mode has been selected by the selection unit, the control unit may perform an opening operation to open the second atmospheric vent passage with the second valve.

[0141] With this configuration, even if the second atmospheric vent channel is closed when the power is turned on from off after the transport mode is selected, the opening operation will be performed, allowing the second atmospheric vent channel to be opened. Therefore, the convenience for the operator can be improved.

[0142] (F) The liquid dispensing device may further include a switching operation unit that allows the open / closed state of the second valve to be manually switched. With this configuration, even if the transport mode is not selected before the power is turned off, the second atmospheric vent channel can be closed by manually switching the selector after the power is turned off, without having to turn the power back on. Therefore, the convenience of the operator can be improved.

[0143] (G) The liquid discharge device may further include a detection unit capable of detecting the open / closed state of the second atmospheric vent channel. With this configuration, the open / closed state of the second atmospheric vent channel can be determined. (H) The liquid dispensing device further comprises a control unit and a display unit capable of displaying information, and when the power is turned on from off, the detection unit detects that the second atmospheric venting channel is closed, the control unit may cause the display unit to display information that the second atmospheric venting channel is closed.

[0144] With this configuration, even if the second atmospheric vent channel is closed when the power is switched from off to on, the operator can be made aware that the second atmospheric vent channel is closed. Therefore, the operator's convenience can be improved.

[0145] (I) The liquid dispensing device further comprises a control unit, and when the power is turned from off to on, the detection unit may detect that the second atmospheric vent passage is closed, in which case the control unit may perform an opening operation to open the second atmospheric vent passage using the second valve.

[0146] With this configuration, even if the second atmospheric vent channel is closed when the power is switched from off to on, the opening operation will be performed, allowing the second atmospheric vent channel to be opened. Therefore, the convenience for the operator can be improved.

[0147] (J) The liquid dispensing device further comprises a control unit, and each time the power is turned from off to on, the control unit may perform an opening operation to open the second atmospheric vent passage with the second valve.

[0148] With this configuration, the second atmospheric vent channel can be opened regardless of whether it was closed or not when the power is switched from off to on. Therefore, the convenience for the operator can be improved. [Explanation of Symbols]

[0149] 11...Liquid dispensing device, 12...Liquid dispensing section, 13...Liquid dispensing head, 14...Nozzle surface, 15...Nozzle, 16...First connection section, 17...Second connection section, 18...Maintenance section, 20...Supply device, 21...Supply mechanism, 22...Tank unit, 23...Mounting section, 24...First storage section, 25...Second storage section, 26...Outlet channel, 27...On / off valve, 28...Supply channel, 29...Recovery channel, 3 0...First flow path valve, 31...Second flow path valve, 32...Micro-pressure unit, 33...Liquid chamber, 34...Flexible member, 35...Air chamber, 36...Spring, 40...Drive mechanism, 41...First atmospheric vent flow path, 42...Second atmospheric vent flow path, 43...Air flow path, 44...Switching mechanism, 45...Connecting flow path, 46...Pressurizing section, 47...Pressure sensor, 48...Narrow tube section, 49...Selector valve, 49A...First selector valve, 49B ...Second selector valve, 49C...Third selector valve, 49D...Fourth selector valve, 49E...Fifth selector valve, 49F...Sixth selector valve, 49G...Seventh selector valve, 49H...Eighth selector valve, 49I...Ninth selector valve, 49J...Tenth selector valve, 49K...Eleventh selector valve, 51...First storage chamber, 51A...Bottom, 51B...Ceiling, 52...Inlet, 53...Introduction section, 53A...Lower end, 53B...Upper end, 54...Introduction valve, 55 ...Liquid level sensor, 56...First liquid level, 57...First gas-liquid separation membrane, 61...Second storage chamber, 61A...Bottom, 61B...Ceiling, 62...Supply port, 63...Filter, 64...Second gas-liquid separation membrane, 65...Second liquid level, 70...Control unit, 70A...Selection unit, 71...Display unit, 72...Operation unit, 73...Switching operation unit, 74...Detection unit, 90...Liquid container, 91...Storage chamber, 92...Outlet unit, 93...Outlet valve.

Claims

1. A first storage section capable of storing liquid supplied from a liquid container, A first atmospheric opening channel that allows the inside of the first storage section to be opened to the atmosphere, A first valve capable of opening and closing the first atmospheric ventilation channel, A second storage section capable of storing the liquid supplied from the first storage section, A second atmospheric opening channel that allows the inside of the second storage section to be opened to the atmosphere, A second valve capable of opening and closing the second atmospheric vent passage, A check valve that allows the flow of liquid from the first storage section to the second storage section and restricts the flow of liquid from the second storage section to the first storage section, A liquid discharge unit capable of discharging liquid supplied from at least the aforementioned second storage unit, Equipped with, It is configured to allow selection between normal mode and transport mode. The aforementioned normal mode is a mode in which the power is turned off while the first atmospheric vent passage is opened by the first valve and the second atmospheric vent passage is opened by the second valve. The transport mode is a mode in which the power is turned off while the first atmospheric vent passage is opened by the first valve and the second atmospheric vent passage is closed by the second valve. A liquid dispensing device characterized by the following features.

2. In the liquid dispensing device according to claim 1, The system further includes a selection unit that allows the selection of the aforementioned transport mode. A liquid dispensing device characterized by the following features.

3. In the liquid dispensing device according to claim 2, Control unit and It further comprises a display unit capable of displaying information, When the transport mode is selected by the selection unit, the control unit closes the second atmospheric venting channel with the second valve and displays information prompting the power to be turned off on the display unit. A liquid dispensing device characterized by the following features.

4. In the liquid dispensing device according to claim 2, It further includes a control unit, When the transport mode is selected by the selection unit, the control unit closes the second atmospheric ventilation channel with the second valve and then turns off the power. A liquid dispensing device characterized by the following features.

5. In the liquid dispensing device according to claim 3 or claim 4, When the power is turned on after the transport mode has been selected by the selection unit, the control unit performs an opening operation to open the second atmospheric ventilation channel using the second valve. A liquid dispensing device characterized by the following features.

6. In the liquid dispensing device according to claim 1, The system further includes a switching operation unit that allows manual switching of the open / closed state of the second valve. A liquid dispensing device characterized by the following features.

7. In the liquid dispensing device according to claim 6, The system further includes a detection unit capable of detecting the open / closed state of the second atmospheric vent channel. A liquid dispensing device characterized by the following features.

8. In the liquid dispensing device according to claim 7, Control unit and It further comprises a display unit capable of displaying information, When the power is switched from off to on, if the detection unit detects that the second atmospheric ventilation channel is closed, the control unit causes the display unit to display information indicating that the second atmospheric ventilation channel is closed. A liquid dispensing device characterized by the following features.

9. In the liquid dispensing device according to claim 7, It further includes a control unit, When the power is switched from off to on, if the detection unit detects that the second atmospheric ventilation channel is closed, the control unit performs an opening operation to open the second atmospheric ventilation channel using the second valve. A liquid dispensing device characterized by the following features.

10. In the liquid dispensing device according to claim 6, It further includes a control unit, Each time the power is switched from off to on, the control unit performs an opening operation to open the second atmospheric ventilation passage using the second valve. A liquid dispensing device characterized by the following features.

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