Tank unit and liquid dispensing device

Abstract

The present invention provides a tank unit and a liquid dispensing device that reduce the risk of supplying more liquid than necessary from a liquid container. [Solution] The tank unit 23 is configured to receive liquid from a liquid container and to store liquid supplied to a head that discharges liquid, and comprises a storage section for storing liquid, an inlet 69 for allowing liquid to flow from the liquid container into the storage section by head difference, and an atmospheric opening section for opening the inside of the storage section to the atmosphere, the storage section having a storage body that defines a storage space in which liquid is stored, and a partition plate 47 that divides the storage space into a first chamber 45A and a second chamber 45B, the first chamber being a space located above the second chamber and communicating with the atmosphere by the atmospheric opening section, the inlet being an inlet pipe 72 extending from the storage body into the storage section and having an inlet opening that communicates with the second chamber, and the partition plate having a through-hole 48 that communicates with the first chamber and the second chamber.

Description

Technical Field

[0001] The present invention relates to a tank unit and a liquid ejection device.

Background Art

[0002] Patent Document 1 describes a liquid ejection device including a head that ejects a liquid and a tank unit that stores the liquid supplied to the head. The tank unit is connected to a liquid container that contains the liquid. When the liquid level in the tank unit drops, the liquid is supplied from the liquid container to the tank unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a liquid ejection device, the liquid level in the tank unit may tilt due to a change in posture or acceleration / deceleration during transportation. In this case, when the liquid level drops, there is a risk that more liquid than necessary will be supplied from the liquid container to the tank unit. If the tank unit stores more liquid than normal, the head discharge performance may be affected by a change in the water head difference between the tank unit and the head.

Means for Solving the Problems

[0005] A tank unit that solves the above problems is configured to receive liquid from a liquid container and to store liquid supplied to a head that discharges liquid, comprising: a storage section for storing liquid; an inlet for allowing liquid to flow from the liquid container to the storage section by head difference; and an atmospheric opening for opening the storage section to the atmosphere, wherein the storage section comprises: a storage body defining a storage space in which liquid is stored; and a partition plate dividing the storage space into a first chamber and a second chamber, the first chamber being a space located above the second chamber and communicating with the atmosphere through the atmospheric opening, the inlet being an inlet pipe extending from the storage body into the storage section and having an inlet opening that communicates with the second chamber, and the partition plate having a through-hole that communicates with the first chamber and the second chamber.

[0006] A liquid dispensing device that solves the above problems comprises the tank unit and the head. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram showing an example of a liquid dispensing device equipped with a tank unit. [Figure 2] Figure 2 is a front view of the tank unit. [Figure 3] Figure 3 is a side view of the tank unit. [Figure 4] Figure 4 is a side view seen from the opposite side compared to Figure 3. [Figure 5] Figure 5 is a cross-sectional view taken along the line 5-5 shown in Figure 3. [Figure 6] Figure 6 is a perspective view of the tank unit shown in Figure 5. [Figure 7] Figure 7 is a perspective view from a different angle than Figure 6. [Figure 8] Figure 8 is a perspective view of the tank unit showing the interior of the section that opens to the atmosphere. [Figure 9] Figure 9 is a perspective view from a different angle than Figure 8. [Figure 10]Figure 10 is a perspective view taken from a different angle than Figures 8 and 9. [Figure 11] Figure 11 is a perspective view taken from a different angle than Figures 8, 9, and 10. [Figure 12] Figure 12 is a cross-sectional view taken along the line 12-12 shown in Figure 2. [Figure 13] Figure 13 is a cross-sectional view taken along the line 13-13 shown in Figure 3. [Figure 14] Figure 14 is a schematic diagram showing the case where the liquid surface is tilted around a virtual axis extending in the second direction. [Figure 15] Figure 15 is a schematic diagram showing the case where the liquid surface is tilted in the opposite direction to that in Figure 14. [Figure 16] Figure 16 is a schematic diagram showing the case where the liquid surface is tilted around a virtual axis extending in the first direction. [Figure 17] Figure 17 is a schematic diagram showing the case where the liquid surface is tilted in the opposite direction to that in Figure 16. [Modes for carrying out the invention]

[0008] The following describes an example of a liquid dispensing device equipped with a tank unit, with reference to the diagram. A liquid dispensing device is an inkjet printer that dispenses images such as characters and photographs by dispensing ink, which is an example of a liquid, onto a medium such as paper, fabric, or film.

[0009] <Liquid discharge device> As shown in Figure 1, the liquid dispensing device 11 includes a head 12. The head 12 is configured to dispense liquid. The head 12 prints an image onto a medium by dispensing liquid onto the medium. The head 12 has a nozzle surface 14 from which one or more nozzles 13 open. The head 12 is configured to dispense liquid from the nozzles 13. In one example, the head 12 is a line head capable of dispensing liquid simultaneously across the width of the medium. The head 12 may also be a serial head configured to scan across the medium.

[0010] The liquid ejection device 11 is configured such that the liquid container 15 is mounted thereon. The liquid container 15 is configured to store liquid. The liquid container 15 is, for example, an ink cartridge. When the liquid container 15 is mounted on the liquid ejection device 11, liquid can be supplied from the liquid container 15 to the liquid ejection device 11.

[0011] The liquid container 15 has a housing member 16. The housing member 16 is a member that defines a space for storing liquid. The liquid container 15 has an outflow pipe 17. The outflow pipe 17 extends from the housing member 16. The outflow pipe 17 communicates with the inside and outside of the housing member 16. As air flows into the housing member 16 through the outflow pipe 17, liquid flows out of the housing member 16 through the outflow pipe 17.

[0012] The liquid container 15 has an outflow valve 18. The outflow valve 18 is a valve located inside the outflow pipe 17. When the outflow valve 18 opens, liquid can flow out of the housing member 16 through the outflow pipe 17. When the liquid container 15 is mounted on the liquid ejection device 11, the outflow valve 18 opens.

[0013] The liquid ejection device 11 includes a supply mechanism 21. The supply mechanism 21 is configured to supply liquid from the liquid container 15 toward the head 12. The supply mechanism 21 supplies liquid while maintaining a negative pressure inside the head 12. The supply mechanism 21 maintains a negative pressure inside the head 12 by means of a head difference. When the inside of the head 12 is maintained at a negative pressure, a meniscus is formed at the nozzle 13. Thereby, the head 12 can appropriately eject liquid. The supply mechanism 21 may be configured to circulate liquid between the liquid container 15 and the head 12. By circulating the liquid by the supply mechanism 21, sedimentation of the liquid is eliminated.

[0014] The supply mechanism 21 has a mounting portion 22. The mounting portion 22 is configured such that the liquid container 15 is mounted thereon. The mounting portion 22 supports the mounted liquid container 15. When the liquid container 15 is mounted on the mounting portion 22, liquid can be supplied from the liquid container 15 to the supply mechanism 21.

[0015] The supply mechanism 21 has a tank unit 23. The tank unit 23 is configured to receive liquid from a liquid container 15. The tank unit 23 receives liquid from the liquid container 15 which is mounted on the mounting section 22. The tank unit 23 is configured to store liquid. Specifically, the tank unit 23 is configured to store the liquid that is supplied to the head 12. The tank unit 23 temporarily stores the liquid during the process of supplying it from the liquid container 15 to the head 12.

[0016] The tank unit 23 is configured to be open to the atmosphere. The supply mechanism 21 maintains a negative pressure inside the head 12 by the difference in hydraulic head between the tank unit 23 and the head 12. Specifically, the tank unit 23 is configured to store liquid such that the liquid level inside the tank unit 23 is below the level of the head 12. In one example, the tank unit 23 is configured to store liquid such that the liquid level inside the tank unit 23 is below the level of the nozzle surface 14.

[0017] The tank unit 23 is configured to be a rectangular parallelepiped or to have a rectangular parallelepiped shape. For example, the tank unit 23 is configured to be a rectangular parallelepiped extending in one direction. The tank unit 23 is configured to extend horizontally in the liquid dispensing device 11. In one example, the tank unit 23 is positioned in the liquid dispensing device 11 to extend in a first direction D1. The tank unit 23 has an elongated shape in the first direction D1. The first direction D1 is the direction of horizontal extension. The first direction D1 is the direction perpendicular to the side of the tank unit 23. The first direction D1 is the direction when viewing the tank unit 23 from the side. The tank unit 23 is rectangular when viewed from a second direction D2. The second direction D2 is the direction of horizontal extension. The second direction D2 is a different direction from the first direction D1. The second direction D2 is the direction perpendicular to the front of the tank unit 23. The second direction D2 is the direction when viewing the tank unit 23 from the front. The first direction D1 and the second direction D2 are different directions from the vertical direction D3. The configuration of the tank unit 23 will be explained in more detail later.

[0018] The supply mechanism 21 has one or more connecting passages. In one example, the supply mechanism 21 has a first connecting passage 24 and a second connecting passage 25. The connecting passage is a passage connected to the tank unit 23. The connecting passage is a passage connected to the head 12. The connecting passage is a passage connecting the tank unit 23 and the head 12.

[0019] The supply mechanism 21 supplies liquid from the tank unit 23 to the print head 12 through the connecting channel. In one example, during printing, the supply mechanism 21 supplies liquid from the tank unit 23 to the print head 12 through both the first connecting channel 24 and the second connecting channel 25.

[0020] The supply mechanism 21 may return liquid from the head 12 to the tank unit 23 through the connecting channel. The supply mechanism 21 may circulate the liquid in the tank unit 23 and the head 12, for example, through a first connecting channel 24 and a second connecting channel 25. In one example, during circulation, the supply mechanism 21 sends liquid from the head 12 to the tank unit 23 through the first connecting channel 24 and from the tank unit 23 to the head 12 through the second connecting channel 25.

[0021] The supply mechanism 21 has one or more connecting valves. In one example, the supply mechanism 21 has a first connecting valve 26 and a second connecting valve 27. A connecting valve is a valve located in a connecting passage. A connecting valve opens and closes a connecting passage. A connecting valve is, for example, a solenoid valve. The first connecting valve 26 is located in the first connecting passage 24. The first connecting valve 26 opens and closes the first connecting passage 24. The second connecting valve 27 is located in the second connecting passage 25. The second connecting valve 27 opens and closes the second connecting passage 25.

[0022] The supply mechanism 21 may have a pressurizing section 28. The pressurizing section 28 is located in the connecting passage. In one example, the pressurizing section 28 is located in the first connecting passage 24. The pressurizing section 28 is configured to pressurize the inside of the head 12. The pressurizing section 28 pressurizes the inside of the head 12 through the connecting passage. The pressurizing section 28 includes a pump. The pressurizing section 28 includes, for example, a diaphragm pump. The pressurizing section 28 includes a pump member 29, a diaphragm 30, and a pressing member 31. The pump member 29 houses the diaphragm 30 and the pressing member 31. The diaphragm 30 divides the inside of the pump member 29 into a liquid chamber and an air chamber. The pressing member 31 presses the diaphragm 30 to reduce the volume of the liquid chamber.

[0023] The pressurizing unit 28 maintains the head 12 by pressurizing the inside of the head 12. In one example, the pressurizing unit 28 pressurizes the inside of the head 12 through the connecting passage by having the pressing member 31 press against the diaphragm 30. When the pressurizing unit 28 pressurizes the inside of the head 12 through the first connecting passage 24, it is preferable that the first connecting valve 26 is closed. By pressurizing the inside of the head 12, the pressurizing unit 28 forces liquid out of the head 12 through the nozzle 13. This discharges viscous liquid, foreign matter, etc., from the head 12.

[0024] The supply mechanism 21 may have a pressure adjustment unit 32. The pressure adjustment unit 32 may be connected to the tank unit 23. The pressure adjustment unit 32 may be connected to the pressurizing unit 28. The pressure adjustment unit 32 may be configured to adjust the pressure inside the tank unit 23. The pressure adjustment unit 32 may be configured to adjust the pressure inside the pressurizing unit 28.

[0025] The pressure adjustment unit 32 may be configured to pressurize the inside of the tank unit 23. The pressure adjustment unit 32 may maintain the head 12 by pressurizing the inside of the tank unit 23. By pressurizing the inside of the tank unit 23, the pressure adjustment unit 32 pressurizes the inside of the head 12 through the connecting passage. This causes viscous liquid, foreign matter, etc. to be discharged from the head 12. The maintenance strength of the head 12 by the pressure adjustment unit 32 pressurizing the inside of the tank unit 23 is greater than the maintenance strength of the head 12 by the pressurizing unit 28 pressurizing the inside of the head 12.

[0026] The pressure regulating unit 32 may be configured to reduce the pressure inside the tank unit 23. The pressure regulating unit 32 may return the liquid from the head 12 to the tank unit 23 by reducing the pressure inside the tank unit 23. The pressure regulating unit 32 may circulate the liquid by reducing the pressure inside the tank unit 23.

[0027] The pressure adjustment unit 32 may be configured to reduce the pressure inside the pressurizing unit 28. The pressure adjustment unit 32 may drive the pressurizing unit 28 by reducing the pressure inside the pressurizing unit 28. For example, the pressure adjustment unit 32 reduces the pressure in the air chamber of the pressurizing unit 28. This causes the diaphragm 30 to displace so that the volume of the liquid chamber increases. At this time, liquid flows into the pressurizing unit 28 from the tank unit 23 and the head 12. When the pressure adjustment unit 32 stops reducing the pressure in the pressurizing unit 28, the diaphragm 30 displaces so that the volume of the liquid chamber decreases. This causes liquid to flow from the pressurizing unit 28 to the head 12. As a result, the inside of the head 12 is pressurized.

[0028] The pressure adjustment unit 32 has an opening / closing unit 33. The opening / closing unit 33 is configured to open and close the tank unit 23 to the outside. The opening / closing unit 33 is configured to open or close the inside of the tank unit 23 to the atmosphere or to shut it off from the atmosphere. The opening / closing unit 33 may also be configured to open and close the pressurizing unit 28 to the outside. The opening / closing unit 33 may also be configured to open or close the inside of the pressurizing unit 28 to the atmosphere or to shut it off from the atmosphere.

[0029] The opening / closing section 33 has one or more air passages. In one example, the opening / closing section 33 has a first air passage 34, a second air passage 35, and a third air passage 36. The multiple air passages may be connected to each other. The first air passage 34 is connected to the tank unit 23. The second air passage 35 is connected to the tank unit 23. The third air passage 36 is connected to the pressurizing section 28. An air passage is a passage through which air flows. The pressure adjustment section 32 adjusts the pressure inside the tank unit 23 or the pressure inside the pressurizing section 28 through the air passages.

[0030] The opening / closing section 33 may have a selector valve 37. The selector valve 37 is configured to open and close an air passage. By opening and closing the air passage, the selector valve 37 opens and closes the inside of the tank unit 23 to the outside, or opens and closes the inside of the pressurizing section 28 to the outside.

[0031] The selector valve 37 may be configured to switch the destination of the air passage. The opening / closing section 33 may, for example, open and close the air passage, or connect to other air passages, or to a pump, sensor, etc.

[0032] The pressure adjustment unit 32 may have an air pump 38. The air pump 38 is configured to circulate air. The air pump 38 is, for example, a tube pump. The air pump 38 is connected to an air passage. The air pump 38 may be connected to the first air passage 34, the second air passage 35, or the third air passage 36. The destination of the air pump 38 is switched by a selector valve 37. The air pump 38 can supply air to the first air passage 34, the second air passage 35, and the third air passage 36, or draw air from the first air passage 34, the second air passage 35, and the third air passage 36.

[0033] The pressure adjustment unit 32 may have a pressure sensor 39. The pressure sensor 39 is configured to measure the pressure in the air passage. The pressure sensor 39 is connected to the air passage. The pressure sensor 39 may be connected to the first air passage 34, the second air passage 35, or the third air passage 36. The connection destination of the pressure sensor 39 is switched by the selector valve 37. The pressure sensor 39 measures the pressure inside the tank unit 23 through the first air passage 34, the second air passage 35, etc. The pressure sensor 39 also measures the pressure inside the pressurizing unit 28 through the third air passage 36.

[0034] The liquid dispensing device 11 includes a control unit 40. The control unit 40 is configured to control the liquid dispensing device 11. The control unit 40 controls, for example, the head 12, the supply mechanism 21, and the like.

[0035] The control unit 40 is configured to receive instructions from an operation panel, a communication terminal, etc. The control unit 40 is configured to receive, for example, print instructions and transport instructions from the user. A print instruction is an instruction to cause the control unit 40 to print an image. A transport instruction is an instruction to notify the control unit 40 that the liquid dispensing device 11 is to be transported. The control unit 40 controls the liquid dispensing device 11 based on the print instruction, transport instruction, etc. During transport, the liquid level in the tank unit 23 may tilt due to changes in the posture of the liquid dispensing device 11 or due to inertia acting on the liquid dispensing device 11. Therefore, when the control unit 40 receives a transport instruction, it controls the liquid dispensing device 11 to be in a state ready for transport. For example, when the control unit 40 receives a transport instruction, it may control the liquid dispensing device 11 to be in a state where no liquid leaks. When the control unit 40 receives a transport instruction, it may also control the connecting valve or the opening / closing unit 33.

[0036] The control unit 40 may consist of one or more processors that perform various processes according to a computer program. The control unit 40 may consist of one or more dedicated hardware circuits, such as ASICs, that perform at least some of the various processes. The control unit 40 may consist of a circuit that includes a combination of processors and hardware circuits. The processor includes a CPU and memory such as RAM and ROM. The memory stores program code or instructions configured to cause the CPU to perform processes. The memory, i.e., computer-readable media, includes any readable media that can be accessed by a general-purpose or dedicated computer.

[0037] <Tank Unit> Next, we will describe the configuration of the tank unit 23. The tank unit 23 has one or more storage sections. In one example, the tank unit 23 has a first storage section 41 and a second storage section 42. The storage sections are configured to store liquid. The first storage section 41 and the second storage section 42 are integrally constructed. The first storage section 41 and the second storage section 42 are arranged, for example, horizontally. In one example, the first storage section 41 and the second storage section 42 are arranged in this order in a first direction D1.

[0038] The tank unit 23 is configured so that liquid flows from the first storage section 41 to the second storage section 42. The first storage section 41 and the second storage section 42 are connected to each other. The first storage section 41 is configured to be supplied with liquid from the liquid container 15. The first storage section 41 stores the liquid supplied from the liquid container 15. The first storage section 41 may also store the liquid returned from the head 12. The second storage section 42 is configured to be supplied with liquid from the first storage section 41. The second storage section 42 stores the liquid supplied from the first storage section 41. The first storage section 41 and the second storage section 42 each store liquid such that the liquid levels are equal to each other.

[0039] The storage section has a storage body. The first storage section 41 has a first storage body 43. The second storage section 42 has a second storage body 44. The storage body is a member that defines the storage space. The storage space is the space within the storage section. The storage space includes the space in which liquid is stored. The storage space is the space in which liquid is stored together with air. The storage space is the space that is open to the atmosphere. The first storage body 43 defines the first storage space 45. The first storage space 45 is the space within the first storage section 41. The second storage body 44 defines the second storage space 46. The second storage space 46 is the space within the second storage section 42.

[0040] As shown in Figures 2, 3, 4, and 5, the storage body has multiple walls. The multiple walls define the storage space. The first storage body 43 and the second storage body 44 each have multiple walls. The first storage body 43 defines the first storage space 45 by its multiple walls. The second storage body 44 defines the second storage space 46 by its multiple walls.

[0041] The storage body has an upper wall and a lower wall. The first storage body 43 has a first upper wall 43A and a first lower wall 43B. The second storage body 44 has a second upper wall 44A and a second lower wall 44B. The upper wall and the lower wall face each other. The upper wall and the lower wall extend in a direction perpendicular to the vertical direction D3. When viewed from the second direction D2, the upper wall and the lower wall extend in the first direction D1.

[0042] The first upper wall 43A and the first lower wall 43B face each other. The first upper wall 43A and the first lower wall 43B extend in a direction perpendicular to the vertical direction D3. When viewed from the second direction D2, the first upper wall 43A and the first lower wall 43B extend in the first direction D1. The second upper wall 44A and the second lower wall 44B face each other. The second upper wall 44A and the second lower wall 44B extend in a direction perpendicular to the vertical direction D3. When viewed from the second direction D2, the second upper wall 44A and the second lower wall 44B extend in the first direction D1. The first upper wall 43A and the second upper wall 44A may be connected to each other or they may be separate. The first lower wall 43B and the second lower wall 44B may be connected to each other or they may be separate.

[0043] The storage body has two side walls. More specifically, the storage body has a connecting side wall and an opposing side wall. The first storage body 43 has a first connecting side wall 43C and a first opposing side wall 43D. The second storage body 44 has a second connecting side wall 44C and a second opposing side wall 44D. The connecting side wall is a wall that connects the upper wall and the lower wall. The opposing side wall is a wall that connects the upper wall and the lower wall. The connecting side wall and the opposing side wall face each other. The connecting side wall and the opposing side wall extend in a direction perpendicular to the first direction D1. When viewed from the second direction D2, the connecting side wall and the opposing side wall extend in the vertical direction D3.

[0044] The first connecting side wall 43C connects to the first upper wall 43A and the first lower wall 43B. The first opposing side wall 43D connects to the first upper wall 43A and the first lower wall 43B. The first connecting side wall 43C and the first opposing side wall 43D face each other. The first connecting side wall 43C and the first opposing side wall 43D extend in a direction perpendicular to the first direction D1. When viewed from the second direction D2, the first connecting side wall 43C and the first opposing side wall 43D extend in the vertical direction D3. The second connecting side wall 44C connects to the second upper wall 44A and the second lower wall 44B. The second opposing side wall 44D connects to the second upper wall 44A and the second lower wall 44B. The second connecting side wall 44C and the second opposing side wall 44D face each other. The second connecting side wall 44C and the second opposing side wall 44D extend in a direction perpendicular to the first direction D1. When viewed from the second direction D2, the second connecting side wall 44C and the second opposing side wall 44D extend in the vertical direction D3. The first connecting side wall 43C, the first opposing side wall 43D, the second opposing side wall 44D, and the second connecting side wall 44C are aligned in the first direction D1 in this order. The first opposing side wall 43D and the second opposing side wall 44D may be a common wall or they may be independent walls. In one example, the second opposing side wall 44D extends along the first opposing side wall 43D.

[0045] The opposing side wall may have an upper side wall and a lower side wall. The first opposing side wall 43D may have a first upper side wall 43DA and a first lower side wall 43DB. The second opposing side wall 44D may have a second upper side wall 44DA and a second lower side wall 44DB. The upper side wall is the upper part of the opposing side wall. The lower side wall is the lower part of the opposing side wall.

[0046] The first upper side wall 43DA is the upper part of the first opposing side wall 43D. The first lower side wall 43DB is the lower part of the first opposing side wall 43D. The second upper side wall 44DA is the upper part of the second opposing side wall 44D. The second lower side wall 44DB is the lower part of the second opposing side wall 44D.

[0047] The upper and lower side walls may be positioned so as not to overlap vertically. That is, the upper and lower side walls may be positioned so as not to overlap when viewed from the vertical direction D3. In one example, the first upper side wall 43DA is positioned so that it is further from the first connecting side wall 43C than the first lower side wall 43DB. More specifically, when viewed from the second direction D2, the distance from the first connecting side wall 43C to the first upper side wall 43DA is greater than the distance from the first connecting side wall 43C to the first lower side wall 43DB. Therefore, the volume of the upper part of the first storage space 45 is greater than the volume of the lower part. The second upper side wall 44DA is positioned so that it is further from the second connecting side wall 44C than the second lower side wall 44DB. More specifically, when viewed from the second direction D2, the distance from the second connecting side wall 44C to the second upper side wall 44DA is smaller than the distance from the second connecting side wall 44C to the second lower side wall 44DB. Therefore, the volume of the upper part of the second storage space 46 is smaller than the volume of the lower part.

[0048] Opposing side walls may have connecting side walls. The first opposing side wall 43D may have a first connecting side wall 43DC. The second opposing side wall 44D may have a second connecting side wall 44DC. The connecting side wall is the part that connects the upper side wall and the lower side wall. When viewed from the second direction D2, the connecting side wall extends in the first direction D1. The first connecting side wall 43DC connects to the first upper side wall 43DA and the first lower side wall 43DB. When viewed from the second direction D2, the first connecting side wall 43DC extends in the first direction D1. The second connecting side wall 44DC connects to the second upper side wall 44DA and the second lower side wall 44DB. When viewed from the second direction D2, the second connecting side wall 44DC extends in the first direction D1.

[0049] The storage body has a front wall and a back wall. The first storage body 43 has a first front wall 43E and a first back wall 43F. The second storage body 44 has a second front wall 44E and a second back wall 44F. The front wall is a wall that connects to the top wall, bottom wall, connecting side wall and opposing side wall. The back wall is a wall that connects to the top wall, bottom wall, connecting side wall and opposing side wall. The front wall and the back wall face each other. The front wall and the back wall extend in a direction perpendicular to the second direction D2. The front wall may be welded to the top wall, bottom wall, connecting side wall and opposing side wall. For example, the front wall may be laser-welded to the top wall, bottom wall, connecting side wall and opposing side wall. The back wall may be a wall that forms the base of the top wall, bottom wall, connecting side wall and opposing side wall. For example, the top wall, bottom wall, connecting side wall, opposing side wall and back wall may be integrally constructed.

[0050] The first front wall 43E is a wall connected to the first upper wall 43A, the first lower wall 43B, the first connecting side wall 43C, and the first opposing side wall 43D. The first rear wall 43F is a wall connected to the first upper wall 43A, the first lower wall 43B, the first connecting side wall 43C, and the first opposing side wall 43D. The first front wall 43E and the first rear wall 43F face each other. The first front wall 43E and the first rear wall 43F extend in a direction perpendicular to the second direction D2. The second front wall 44E is a wall connected to the second upper wall 44A, the second lower wall 44B, the second connecting side wall 44C, and the second opposing side wall 44D. The second rear wall 44F is a wall connected to the second upper wall 44A, the second lower wall 44B, the second connecting side wall 44C, and the second opposing side wall 44D. The second front wall 44E and the second rear wall 44F face each other. The second front wall 44E and the second rear wall 44F extend in a direction perpendicular to the second direction D2. The first front wall 43E and the second front wall 44E may be connected to each other or separate from each other. The first rear wall 43F and the second rear wall 44F may be connected to each other or separate from each other.

[0051] As shown in Figures 5, 6, 7, and 8, the storage section has a partition plate 47. Specifically, the first storage section 41 has a partition plate 47. The second storage section 42 does not have a partition plate 47. The partition plate 47 is a plate that divides the inside of the first storage section 41. The partition plate 47 is located inside the first storage section 41.

[0052] The partition plate 47 divides the first storage space 45 vertically. The partition plate 47 divides the first storage space 45 into a first chamber 45A and a second chamber 45B. The first chamber 45A is the space located above the second chamber 45B. The first chamber 45A is a space mainly for storing air. The first chamber 45A is a space that is open to the atmosphere. More specifically, the first chamber 45A is a space that is open to the first air passage 34. The second chamber 45B is a space mainly for storing liquid. The second chamber 45B is a space that is open to the inside of the liquid container 15. The second chamber 45B is a space where the liquid supplied from the liquid container 15 is stored.

[0053] The partition plate 47 partitions the first storage space 45 so that the liquid remains in the second chamber 45B when the liquid level tilts. In the tank unit 23, the liquid level may tilt due to changes in posture during transport, acceleration and deceleration, etc. In the first storage section 41, the liquid level may drop when the liquid level tilts. When the liquid level drops in the first storage section 41, liquid is supplied from the liquid container 15. Therefore, the partition plate 47 reduces the risk of supplying more liquid to the first storage section 41 than necessary by keeping the liquid in the second chamber 45B when the liquid level tilts.

[0054] The volume of the second chamber 45B may be smaller than the volume of the first chamber 45A. If the volume of the second chamber 45B is small, the liquid level is more likely to fluctuate significantly in response to liquid supply and consumption. Large fluctuations in the liquid level make it easier to determine whether there is too little or too much liquid stored in the first storage section 41. Also, if the volume of the first chamber 45A is large, excess liquid can be stored in the first chamber 45A if more liquid than necessary is supplied.

[0055] The first room 45A is the space that the first upper side wall 43DA faces. The first room 45A is defined by the first upper wall 43A, the first connecting side wall 43C, the first upper side wall 43DA, the first connecting side wall 43DC, the first front wall 43E, the first rear wall 43F, and the partition plate 47. The second room 45B is the space that the first lower side wall 43DB faces. The second room 45B is defined by the first lower wall 43B, the first connecting side wall 43C, the first lower side wall 43DB, the first front wall 43E, the first rear wall 43F, and the partition plate 47.

[0056] The partition plate 47 extends from the first reservoir 43. The partition plate 47 extends from the first connecting side wall 43C and the first opposing side wall 43D. The partition plate 47 extends, for example, from the first connecting side wall 43DC. In one example, the partition plate 47 extends in a continuous manner from the first connecting side wall 43DC. The partition plate 47 extends in a manner that extends the first connecting side wall 43DC. The partition plate 47 may extend horizontally. In one example, the partition plate 47 extends in a first direction D1. By extending the partition plate 47 horizontally, the height of the liquid level stored in the first reservoir 41 and the height of the partition plate 47 become more likely to coincide. In this case, air is less likely to be stored in the second chamber 45B. As a result, the liquid in the second chamber 45B is less likely to ripple, and therefore less likely to foam.

[0057] A through-hole 48 is provided in the partition plate 47. The through-hole 48 is an opening that allows the first chamber 45A and the second chamber 45B to pass through. Air flows from the second chamber 45B to the first chamber 45A through the through-hole 48. This facilitates the smooth supply of liquid from the liquid container 15 to the second chamber 45B. It is preferable that the through-hole 48 is small enough that the liquid stored in the second chamber 45B does not form a meniscus. The smaller the through-hole 48, the more difficult it is for the liquid to flow from the second chamber 45B to the first chamber 45A. In other words, the smaller the through-hole 48, the easier it is to retain the liquid in the second chamber 45B.

[0058] In the partition plate 47, liquid is less likely to flow from the second chamber 45B to the first chamber 45A when the through-hole 48 is positioned to connect to the edge of the second chamber 45B than when the through-hole 48 is positioned to connect to the center of the second chamber 45B. Therefore, in the partition plate 47, it is preferable that the through-hole 48 be positioned adjacent to the first connecting side wall 43C, the first opposing side wall 43D, the first front wall 43E, the first rear wall 43F, etc. In this case, even if the liquid level is tilted, the liquid is more likely to remain in the second chamber 45B.

[0059] The partition plate 47 is configured to be rectangular or rectangular in shape when viewed from the vertical direction D3. In one example, the through-hole 48 is located at the corner of the partition plate 47. This makes it difficult for liquid to flow from the second chamber 45B to the first chamber 45A.

[0060] The partition plate 47 may have a first portion 47A and a second portion 47B. The first portion 47A is the portion extending from the first opposing side wall 43D. More specifically, the first portion 47A is the portion extending from the first connecting side wall 43DC to the inflow pipe 72, which will be described later. The second portion 47B is the portion extending from the first connecting side wall 43C. More specifically, the second portion 47B is the portion extending from the first connecting side wall 43C to the inflow pipe 72. The first portion 47A and the second portion 47B are portions that do not overlap with the inflow pipe 72 when viewed from the second direction D2. The lengths of the first portion 47A and the second portion 47B may be the same or different. In one example, the first portion 47A is longer than the second portion 47B.

[0061] The first part 47A and the second part 47B may be connected to each other or they may be separate. For example, the first part 47A and the second part 47B may be connected to each other by the portion of the partition plate 47 that overlaps with the inlet pipe 72. For example, the first part 47A and the second part 47B may be separated by a through-hole 48 opening between the first part 47A and the second part 47B in the partition plate 47. In one example, the first part 47A and the second part 47B are connected to each other. A through-hole 48 opens in the second part 47B. The opening of the through-hole 48 in the short second part 47B makes it difficult for liquid to flow from the second chamber 45B to the first chamber 45A.

[0062] The tank unit 23 may have one or more liquid sensors. The tank unit 23 has a first liquid sensor 49 and a second liquid sensor 50. The liquid sensors are configured to detect liquid. Specifically, the liquid sensors are configured to detect liquid in the first storage section 41. The liquid sensors detect liquid by touching the liquid. The liquid sensors are attached to the first storage section 41. In one example, the liquid sensors are attached to the first upper wall 43A. The liquid sensors extend from the first upper wall 43A into the first storage section 41.

[0063] The first liquid sensor 49 is located in the first chamber 45A. In one example, the first liquid sensor 49 extends from the first upper wall 43A to the first chamber 45A. The first liquid sensor 49 detects the liquid in the first chamber 45A. By detecting the liquid in the first chamber 45A, the first liquid sensor 49 detects an overflow in the tank unit 23. If the first liquid sensor 49 touches the liquid, there is a possibility that liquid has accumulated in the first chamber 45A. In this case, there is a possibility that the tank unit 23 is being supplied with an excessive amount of liquid. When the control unit 40 detects an overflow, it may discharge the liquid in the tank unit 23 through the head 12.

[0064] The second liquid sensor 50 is located in the second chamber 45B. In one example, the second liquid sensor 50 extends from the first upper wall 43A to the second chamber 45B. The second liquid sensor 50 extends so as to penetrate the partition plate 47. For example, the second liquid sensor 50 extends so as to penetrate the first section 47A. The second liquid sensor 50 detects the liquid in the second chamber 45B. The second liquid sensor 50 detects the near end of the tank unit 23 by not detecting the liquid in the second chamber 45B. If the second liquid sensor 50 does not touch the liquid, there is a possibility that the amount of liquid in the second chamber 45B is very low. In this case, there is a possibility that liquid is not being supplied from the liquid container 15 to the tank unit 23. When the near end is detected, the control unit 40 may notify that the liquid container 15 should be replaced.

[0065] The tank unit 23 has a connecting passage 51. The connecting passage 51 is a passage that connects the first storage section 41 and the second storage section 42. In one example, the connecting passage 51 is connected to the first lower wall 43B and the second lower wall 44B. The connecting passage 51 allows the first storage space 45 and the second storage space 46 to pass through. More specifically, the connecting passage 51 allows the second chamber 45B and the second storage space 46 to pass through. Liquid flows from the first storage section 41 to the second storage section 42 through the connecting passage 51.

[0066] The tank unit 23 has a one-way valve 52. The one-way valve 52 is a valve that restricts the flow of liquid in a connecting passage 51 in one direction. The one-way valve 52 is configured to allow liquid to flow in the connecting passage 51 from the first storage section 41 to the second storage section 42. The one-way valve 52 is configured to suppress flow in the connecting passage 51 from the second storage section 42 to the first storage section 41. The one-way valve 52 opens when the pressure in the first storage section 41 is greater than the pressure in the second storage section 42. The one-way valve 52 opens, for example, when the liquid level in the first storage section 41 is higher than the liquid level in the second storage section 42. The one-way valve 52 is, for example, an umbrella valve. In one example, the one-way valve 52 is mounted on the first lower wall 43B.

[0067] As shown in Figures 9 and 10, the tank unit 23 has one or more connecting pipes. In one example, the tank unit 23 has a first connecting pipe 53 and a second connecting pipe 54. The connecting pipes connect the storage section to the head 12. The first connecting pipe 53 connects the first storage section 41 to the head 12. The second connecting pipe 54 connects the second storage section 42 to the head 12.

[0068] The connecting pipes are connected to the connecting channels. This connects the storage unit to the head 12. The first connecting pipe 53 is connected to the first connecting channel 24. The second connecting pipe 54 is connected to the second connecting channel 25. The connecting pipes extend from the storage unit. More specifically, the connecting pipes extend from the lower wall. The first connecting pipe 53 extends from the first lower wall 43B. The second connecting pipe 54 extends from the second lower wall 44B. Through the first connecting pipe 53, liquid is supplied from the first storage unit 41 to the head 12, and liquid is returned from the head 12 to the first storage unit 41. Through the second connecting pipe 54, liquid is supplied from the second storage unit 42 to the head 12.

[0069] A connection port opens in the connecting pipe. The first connecting pipe 53 has a first connection port 55. The second connecting pipe 54 has a second connection port 56. The connection ports lead to the storage space. The first connection port 55 leads to the first storage space 45. More specifically, the first connection port 55 leads to the second chamber 45B. The second connection port 56 leads to the second storage space 46.

[0070] The first connection port 55 may be positioned so as not to overlap with the through port 48 when viewed from the vertical direction D3. That is, the first connection port 55 may be positioned so as not to overlap with the through port 48 vertically. In one example, the first connection port 55 may be positioned so that the distance from the first connection side wall 43C is greater than that from the through port 48. Specifically, when viewing the first reservoir 43 from a direction perpendicular to the first front wall 43E, the distance from the first connection side wall 43C to the first connection port 55 may be greater than the distance from the first connection side wall 43C to the through port 48. That is, when viewing the first reservoir 43 from the second direction D2, the first connection port 55 and the through port 48 may be far apart. At the through port 48, the liquid is in contact with air, so the liquid is prone to foaming as the liquid surface ripples. Therefore, because the first connection port 55 and the through port 48 do not overlap vertically, it becomes difficult for air bubbles to reach the first connection port 55 from the through port 48. This reduces the risk of air bubbles flowing into the head 12 through the first connection port 55.

[0071] Air bubbles may enter the first storage section 41 from the first connection port 55. For example, air bubbles may be mixed into the liquid returned to the first storage section 41 from the head 12. In this case, the fact that the first connection port 55 and the through port 48 do not overlap vertically makes it difficult for air bubbles to reach the through port 48 from the first connection port 55. If air bubbles reach the through port 48, there is a risk that air bubbles will accumulate in the first chamber 45A. For example, if air bubbles come into contact with the first liquid sensor 49, there is a risk of false detection of overflow. Therefore, the fact that the first connection port 55 and the through port 48 do not overlap vertically reduces the risk of false detection of overflow. In addition, because air bubbles are less likely to reach the first chamber 45A, the risk of air bubbles obstructing the release of air into the atmosphere in the first chamber 45A is reduced.

[0072] As shown in Figure 11, the tank unit 23 has one or more atmospheric vents. In one example, the tank unit 23 has a first atmospheric vent 57 and a second atmospheric vent 58. The atmospheric vents are configured to open the storage section to the atmosphere. The first atmospheric vent 57 is configured to open the first storage section 41 to the atmosphere. The first atmospheric vent 57 allows the first storage space 45 to be exposed to the atmosphere. More specifically, the first atmospheric vent 57 allows the first chamber 45A to be exposed to the atmosphere. The second atmospheric vent 58 is configured to open the second storage section 42 to the atmosphere. The second atmospheric vent 58 allows the second storage space 46 to be exposed to the atmosphere.

[0073] The atmospheric vent is connected to the pressure adjustment unit 32. More specifically, the first atmospheric vent 57 is connected to the first air passage 34. The first atmospheric vent 57 allows the first storage space 45 to be exposed to the atmosphere through the first air passage 34. The first atmospheric vent 57 may also directly expose the first storage space 45 to the atmosphere. The second atmospheric vent 58 is connected to the second air passage 35. The second atmospheric vent 58 allows the second storage space 46 to be exposed to the atmosphere through the second air passage 35. The second atmospheric vent 58 may also directly expose the second storage space 46 to the atmosphere.

[0074] The atmospheric vent section is opened and closed by the opening / closing section 33. That is, the atmospheric vent section is opened to the atmosphere or closed off from the atmosphere by the opening / closing section 33. The first atmospheric vent section 57 is opened and closed by the selector valve 37 opening or closing the first air passage 34 to the atmosphere. The second atmospheric vent section 58 is opened and closed by the selector valve 37 opening or closing the second air passage 35 to the atmosphere.

[0075] The atmospheric vent section has an open pipe. The first atmospheric vent section 57 has a first open pipe 59. The second atmospheric vent section 58 has a second open pipe 60. The open pipe is a pipe connected to an air passage. The first open pipe 59 is connected to the first air passage 34. The second open pipe 60 is connected to the second air passage 35.

[0076] The atmospheric vent section has an open channel. The first atmospheric vent section 57 has a first open channel 61. The second atmospheric vent section 58 has a second open channel 62. An open channel is a channel that connects to an open pipe. An open channel is a channel through which air flows. The first open channel 61 connects to the first open pipe 59. The first open channel 61 extends from the first open pipe 59. The second open channel 62 connects to the second open pipe 60. The second open channel 62 extends from the second open pipe 60. In one example, the first open channel 61 and the second open channel 62 extend along the second storage body 44. More specifically, the first open channel 61 and the second open channel 62 extend along the second connecting side wall 44C and the second upper wall 44A.

[0077] The atmospheric vent section has an opening member. The first atmospheric vent section 57 has a first opening member 63. The second atmospheric vent section 58 has a second opening member 64. The opening member connects to the open channel. The opening member extends from the storage body. The opening member extends from the upper wall. The opening member is a member that defines an open chamber. The open chamber is a space that communicates with the open channel. The open chamber is a space that communicates with the storage space. The first opening member 63 connects to the first open channel 61. The first opening member 63 extends from the first upper wall 43A. The first opening member 63 defines the first open chamber 65. The first open chamber 65 communicates with the first open channel 61. The first open chamber 65 communicates with the first storage space 45. More specifically, the first open chamber 65 communicates with the first chamber 45A. The second opening member 64 is connected to the second opening channel 62. The second opening member 64 extends from the second upper wall 44A. The second opening member 64 defines the second opening chamber 66. The second opening chamber 66 is connected to the second opening channel 62. The second opening chamber 66 is connected to the second storage space 46.

[0078] The atmospheric opening section has a moisture-permeable membrane. The first atmospheric opening section 57 has a first moisture-permeable membrane 67. The second atmospheric opening section 58 has a second moisture-permeable membrane 68. The moisture-permeable membrane is a membrane that restricts the passage of liquids while allowing the passage of gases. The moisture-permeable membrane is attached to the opening member. The moisture-permeable membrane is located in the open chamber. The moisture-permeable membrane allows air to flow between the storage space and the open chamber, while restricting the outflow of liquid from the storage space to the open chamber. The first moisture-permeable membrane 67 is attached to the first opening member 63. The first moisture-permeable membrane 67 is located in the first open chamber 65. The first moisture-permeable membrane 67 allows air to flow between the first storage space 45 and the first open chamber 65, while restricting the outflow of liquid from the first storage space 45 to the first open chamber 65. The second moisture-permeable membrane 68 is attached to the second opening member 64. The second permeable membrane 68 is located in the second open chamber 66. The second permeable membrane 68 allows air to flow between the second storage space 46 and the second open chamber 66, while restricting the outflow of liquid from the second storage space 46 into the second open chamber 66.

[0079] As shown in Figures 5, 6, and 7, the tank unit 23 has an inlet 69. The inlet 69 is configured to allow liquid to flow from the liquid container 15 into the storage section. More specifically, the inlet 69 is configured to allow liquid to flow from the liquid container 15 into the first storage section 41. The inlet 69 allows liquid to flow from the liquid container 15 into the first storage section 41 by the difference in water head. The inlet 69 allows liquid to flow from the liquid container 15 into the first storage section 41 through the outlet pipe 17 by allowing air to flow from the first storage section 41 into the liquid container 15 through the outlet pipe 17.

[0080] The inlet 69 may have a guide pipe 70. The guide pipe 70 is a pipe that extends outside the first storage section 41. The guide pipe 70 extends upward from the first upper wall 43A. The guide pipe 70 is a pipe that is connected to the liquid container 15. The guide pipe 70 may be connected to the liquid container 15 by being inserted into the outlet pipe 17. The guide pipe 70 may be connected to the liquid container 15 by the outlet pipe 17 being inserted into the guide pipe 70.

[0081] The inlet 69 may have a guide valve 71. The guide valve 71 is located inside the guide pipe 70. The guide valve 71 is a valve that opens and closes the guide pipe 70. The guide valve 71 may be a check valve. The guide valve 71 is configured to open when the guide pipe 70 is connected to the liquid container 15.

[0082] The inlet section 69 has an inlet pipe 72. The inlet pipe 72 is a pipe that extends inside the first storage section 41. The inlet pipe 72 extends from the first storage body 43. The inlet pipe 72 extends from the first upper wall 43A. The inlet pipe 72 extends downward from the first upper wall 43A. The inlet pipe 72 extends from the first upper wall 43A so as to connect with the partition plate 47.

[0083] An inlet 73 opens into the inlet pipe 72. The inlet 73 is an opening through which liquid flows. The inlet 73 is connected to the second chamber 45B. The inlet pipe 72 extends so that the inlet 73 is connected to the second chamber 45B. The inlet pipe 72 extends from the first upper wall 43A to the second chamber 45B so as to pass through the first chamber 45A. In the inlet pipe 72, as air flows from the first storage section 41 to the liquid container 15, liquid flows from the liquid container 15 to the first storage section 41. In this way, liquid is supplied from the liquid container 15 to the first storage section 41 through the inlet pipe 72.

[0084] As shown in Figures 9 and 10, the inlet pipe 72 has a tip portion 74. The tip portion 74 is the part that constitutes the end of the inlet pipe 72 extending from the first upper wall 43A. The tip portion 74 is located inside the first reservoir 43. An inlet 73 opens into the tip portion 74.

[0085] In the tank unit 23, liquid is supplied from the liquid container 15 to the first storage section 41 by the difference in water head until the liquid level reaches the tip portion 74. That is, liquid is supplied from the liquid container 15 to the first storage section 41 by the difference in water head until the tip portion 74 is blocked by the liquid. When the liquid level reaches the tip portion 74, air stops flowing from the first storage section 41 to the liquid container 15 through the inlet pipe 72. As a result, the supply of liquid stops.

[0086] The tip portion 74 may be positioned to be in line with the partition plate 47. For example, the tip portion 74 may be positioned at the same height as the partition plate 47. The inlet pipe 72 may extend so that the tip portion 74 is flush with the partition plate 47. By the tip portion 74 being in line with the partition plate 47, liquid is supplied from the liquid container 15 to the first storage section 41 so that the second chamber 45B is filled with liquid. This makes it easier for the liquid level to match the height of the partition plate 47. In this case, air is less likely to remain in the second chamber 45B, so the liquid is less likely to foam. The tip portion 74 may be positioned below the partition plate 47. For example, the inlet pipe 72 may extend so as to penetrate the partition plate 47.

[0087] As shown in Figures 12 and 13, the inlet 73 is positioned so as not to overlap with the through-hole 48 when the first storage body 43 is viewed from the front from a direction perpendicular to the first front wall 43E. More specifically, the inlet 73 is positioned so as not to overlap with the through-hole 48 on the partition plate 47 when the first storage body 43 is viewed from the second direction D2. That is, the through-hole 48 is positioned so as not to overlap with the inlet 73 when the tank unit 23 is viewed from the front. As a result, compared to the case where the through-hole 48 overlaps with the inlet 73 when the tank unit 23 is viewed from the front, liquid is less likely to flow from the second chamber 45B to the first chamber 45A.

[0088] The inlet 73 is positioned so as not to overlap with the through-hole 48 when the first storage body 43 is viewed from the front in a direction perpendicular to the first connecting side wall 43C. More specifically, the inlet 73 is positioned so as not to overlap with the through-hole 48 on the partition plate 47 when the first storage body 43 is viewed from the first direction D1. In other words, the through-hole 48 is positioned so as not to overlap with the inlet 73 when the tank unit 23 is viewed from the side. As a result, compared to the case where the through-hole 48 overlaps with the inlet 73 when the tank unit 23 is viewed from the side, liquid is less likely to flow from the second chamber 45B to the first chamber 45A.

[0089] <Condition of the tank unit during transport> Next, we will describe the state of the tank unit 23 during transport. As shown in Figures 14 and 15, when the liquid level tilts so that the tank unit 23 oscillates around a virtual axis extending in the second direction D2, the partition plate 47 makes it easier for the liquid to remain in the second chamber 45B. In other words, the liquid level in the first storage section 41 does not easily drop. Therefore, the partition plate 47 makes it easier to maintain the liquid level while blocking the inlet pipe 72.

[0090] If the liquid level remains tilted for a certain period of time, there is a risk that liquid may flow from the first storage section 41 to the second storage section 42 through the connecting channel 51 due to the difference in water head. For example, if the orientation of the tank unit 23 changes so that the first storage section 41 is positioned above the second storage section 42, there is a risk that liquid may flow from the first storage section 41 to the second storage section 42. In this case, there is a risk that the inlet pipe 72 may be opened due to a drop in the liquid level in the first storage section 41. Therefore, when the control unit 40 receives a transport instruction, it may close the second atmospheric vent 58 by controlling the opening / closing section 33. In other words, when the liquid discharge device 11 is being transported, the control unit 40 may isolate the second storage section 42 from the atmosphere. As a result, the liquid discharge device 11 maintains a state in which the second storage section 42 is isolated from the atmosphere even when the power is off during transport. Because the second storage section 42 is isolated from the atmosphere, liquid does not flow from the first storage section 41 to the second storage section 42. As a result, the liquid level is more easily maintained in a state that blocks the inlet pipe 72.

[0091] As shown in Figures 16 and 17, when the liquid level tilts so that the tank unit 23 oscillates around a virtual axis extending in the first direction D1, the partition plate 47 makes it easier for the liquid to remain in the second chamber 45B. In other words, the liquid level in the first storage section 41 does not easily drop. Therefore, the partition plate 47 makes it easier to maintain the liquid level while blocking the inlet pipe 72.

[0092] <Effects and Effects of the Examples> Next, the operation and effects of the above embodiment will be described. (1) The first storage section 41 includes a first storage body 43 that defines the first storage space 45, and a partition plate 47 that divides the first storage space 45 into a first chamber 45A and a second chamber 45B. The partition plate 47 has a through-hole 48 that allows the first chamber 45A and the second chamber 45B to pass through. With the above configuration, when the liquid level tilts, the partition plate 47 makes it difficult for the liquid level to drop. Therefore, when the liquid level tilts, the inlet 73 is more likely to remain blocked by the liquid. This reduces the risk of more liquid being supplied from the liquid container 15 than necessary.

[0093] (2) The through-hole 48 is positioned so as not to overlap with the inlet 73 when the first reservoir 43 is viewed from a direction perpendicular to the first front wall 43E. With the above configuration, when the liquid level is tilted, it is difficult for liquid to flow from the second chamber 45B into the first chamber 45A.

[0094] (3) The through-hole 48 is positioned so as not to overlap with the inlet 73 when the first reservoir 43 is viewed from a direction perpendicular to the first connecting side wall 43C. With the above configuration, when the liquid level is tilted, it is difficult for liquid to flow from the second chamber 45B into the first chamber 45A.

[0095] (4) The partition plate 47 is connected to the tip portion 74. With the above configuration, the partition plate 47 and the liquid surface are more likely to coincide, so the liquid is less likely to foam when the liquid surface is tilted. (5) The partition plate 47 extends horizontally. With the above configuration, the partition plate 47 and the liquid surface are more likely to coincide, so the liquid is less likely to foam when the liquid surface is tilted.

[0096] (6) The through-hole 48 opens into the second portion 47B. With the above configuration, when the liquid level is tilted, it is difficult for liquid to flow from the second chamber 45B into the first chamber 45A. (7) The volume of the second chamber 45B is smaller than the volume of the first chamber 45A. With the above configuration, because the volume of the second chamber 45B is small, the liquid level fluctuates greatly with increases or decreases in liquid. The large fluctuation in the liquid level makes it easy to detect when there is a shortage of liquid. Also, because the volume of the first chamber 45A is large, the tank unit 23 can store liquid in the first chamber 45A if more liquid than necessary is supplied. In addition, because the volume of the first chamber 45A is large, if the liquid level tilts and liquid enters the first chamber 45A, or if air bubbles enter the first chamber 45A, the liquid is less likely to come into contact with the first liquid sensor 49, the first moisture-permeable membrane 67, etc.

[0097] (8) When the first storage body 43 is viewed from a direction perpendicular to the first front wall 43E, the distance from the first connecting side wall 43C to the first upper side wall 43DA is greater than the distance from the first connecting side wall 43C to the first lower side wall 43DB. With the above configuration, the tank unit 23 can store liquid in the first chamber 45A if more liquid is supplied than necessary.

[0098] (9) The through-port 48 is positioned so as not to overlap with the first connection port 55 when viewed from the vertical direction D3. When the liquid level is tilted, the liquid may ripple between the first chamber 45A and the second chamber 45B through the through-port 48, causing bubbles to form in the liquid. With the above configuration, since the through-port 48 does not overlap with the first connection port 55 vertically, the risk of bubbles flowing from the through-port 48 to the first connection port 55 is reduced. Because bubbles are less likely to flow into the first connection port 55, bubbles are less likely to enter the first chamber 45A. This reduces the risk of bubbles adhering to the first moisture-permeable membrane 67 or the first liquid sensor 49. In addition, the risk of bubbles contained in the liquid returned from the head 12 to the first reservoir 43 through the first connection port 55 flowing into the through-port 48 is reduced.

[0099] (10) When the first reservoir 43 is viewed from the front from a direction perpendicular to the first front wall 43E, the distance from the first connecting side wall 43C to the first connection port 55 is greater than the distance from the first connecting side wall 43C to the through port 48. With the above configuration, since the through port 48 and the first connection port 55 are far apart, the risk of air bubbles flowing from the through port 48 to the first connection port 55 is reduced. Also, the risk of air bubbles flowing from the first connection port 55 to the through port 48 is reduced.

[0100] (11) When the control unit 40 receives a transport instruction, it controls the opening / closing unit 33 to close the second atmospheric vent 58. With the above configuration, the risk of liquid flowing from the first storage unit 41 to the second storage unit 42 when the liquid level tilts during transport is reduced. As a result, the risk of more liquid being supplied to the first storage unit 41 than necessary is reduced.

[0101] <Technical philosophy> The technical concepts and their effects, as understood from the above embodiments and modifications, are described below.

[0102] (A) The tank unit is configured to receive liquid from a liquid container and to store liquid supplied to a head that discharges liquid, and comprises a storage section for storing liquid, an inlet section for allowing liquid to flow from the liquid container to the storage section by head difference, and an atmospheric opening section for opening the inside of the storage section to the atmosphere, the storage section having a storage body that defines a storage space in which liquid is stored, and a partition plate that divides the storage space into a first chamber and a second chamber, the first chamber being a space located above the second chamber and communicating with the atmosphere through the atmospheric opening section, the inlet section being an inlet pipe extending from the storage body into the storage section and having an inlet opening that communicates with the second chamber, and the partition plate having a through-hole that communicates with the first chamber and the second chamber. With the above configuration, when the liquid level tilts, the liquid level is less likely to drop due to the partition plate. Therefore, when the liquid level tilts, the inlet is more likely to remain blocked by the liquid. This reduces the risk of excessive liquid being supplied from the liquid container.

[0103] (B) In the tank unit described above, the storage body has an upper wall on which the inlet pipe extends, a lower wall opposite to the upper wall, a connecting side wall connected to the upper wall and the lower wall, an opposing side wall connected to the upper wall and the lower wall, the opposing side wall opposite to the connecting side wall, a front wall connected to the upper wall, the lower wall, the connecting side wall, and the opposing side wall, and a back wall connected to the upper wall, the lower wall, the connecting side wall, and the opposing side wall, the back wall opposite to the front wall, and the through-hole may be positioned so as not to overlap with the inlet when the storage body is viewed from a direction perpendicular to the front wall. With the above configuration, when the liquid level is tilted, it is difficult for liquid to flow from the second chamber to the first chamber.

[0104] (C) In the tank unit described above, the storage body has an upper wall on which the inlet pipe extends, a lower wall opposite to the upper wall, a connecting side wall connected to the upper wall and the lower wall, an opposing side wall connected to the upper wall and the lower wall, the opposing side wall opposite to the connecting side wall, a front wall connected to the upper wall, the lower wall, the connecting side wall and the opposing side wall, and a back wall connected to the upper wall, the lower wall, the connecting side wall and the opposing side wall, the back wall opposite to the front wall, and the through-hole may be positioned so as not to overlap with the inlet when the storage body is viewed from a direction perpendicular to the connecting side wall. With the above configuration, when the liquid level is tilted, it is difficult for liquid to flow from the second chamber to the first chamber.

[0105] (D) In ​​the above tank unit, the inlet pipe has a tip portion located inside the storage body, and the partition plate may be connected to the tip portion. With the above configuration, the partition plate and the liquid surface are more likely to coincide, so the liquid is less likely to foam when the liquid surface is tilted.

[0106] (E) In the tank unit described above, the partition plate may extend horizontally. With this configuration, the partition plate and the liquid surface are more likely to coincide, so the liquid is less likely to foam when the liquid surface is tilted.

[0107] (F) In the tank unit described above, the partition plate has a first portion that extends from the connecting side wall to the inlet pipe when the storage body is viewed from a direction perpendicular to the front wall, and a second portion that extends from the opposing side wall to the inlet pipe when the storage body is viewed from a direction perpendicular to the front wall, wherein the first portion is longer than the second portion when the storage body is viewed from a direction perpendicular to the front wall, and the through-hole may open to the second portion. With the above configuration, when the liquid level is tilted, it is difficult for liquid to flow from the second chamber to the first chamber.

[0108] (G) In the tank unit described above, the volume of the second chamber may be smaller than the volume of the first chamber. With the above configuration, because the volume of the second chamber is small, the liquid level fluctuates significantly with increases or decreases in liquid. The large fluctuation in the liquid level makes it easy to detect when there is a shortage of liquid.

[0109] (H) In the tank unit described above, the storage body has an upper wall on which the inlet pipe extends, a lower wall opposite to the upper wall, a connecting side wall connected to the upper wall and the lower wall, an opposing side wall connected to the upper wall and the lower wall, the opposing side wall opposite to the connecting side wall, a front wall connected to the upper wall, the lower wall, the connecting side wall and the opposing side wall, and a rear wall connected to the upper wall, the lower wall, the connecting side wall and the opposing side wall, the rear wall opposite to the front wall, wherein the opposing side wall has an upper side wall defining the first chamber and a lower side wall defining the second chamber, and when the storage body is viewed from a direction perpendicular to the front wall, the distance from the connecting side wall to the upper side wall may be greater than the distance from the connecting side wall to the lower side wall. With the above configuration, the tank unit can store liquid in the first chamber when more liquid than necessary is supplied.

[0110] (I) The tank unit is provided with a connecting pipe that connects the storage section to the head, the connecting pipe having an opening for connection, the connecting pipe extending from the lower wall, and the through-hole may be positioned so as not to overlap with the connection hole when viewed from the vertical direction. When the liquid level is tilted, the liquid may ripple between the first chamber and the second chamber through the through-hole, causing bubbles to form in the liquid. With the above configuration, since the through-hole does not overlap with the connection hole vertically, the risk of bubbles flowing from the through-hole to the connection hole is reduced.

[0111] (J) In the above tank unit, when the storage body is viewed from a direction perpendicular to the front wall, the distance from the connecting side wall to the connection port may be greater than the distance from the connecting side wall to the through port. With the above configuration, since the through port and the connection port are separated, the risk of air bubbles flowing into the connection port is reduced.

[0112] (K) The liquid dispensing device comprises the tank unit and the head. With the above configuration, the same effects as the tank unit described above can be obtained. (L) In the liquid dispensing device described above, the storage section is a first storage section, the atmospheric vent section is a first atmospheric vent section, the tank unit comprises a second storage section from which liquid is supplied from the first storage section, a connecting channel connecting the first storage section and the second storage section, and a second atmospheric vent section that opens the inside of the second storage section to the atmosphere, the liquid dispensing device comprises an opening / closing section for opening and closing the second atmospheric vent section, and a control unit, the control unit may close the second atmospheric vent section by controlling the opening / closing section when it receives a transport instruction. With the above configuration, the risk of liquid flowing from the first storage section to the second storage section when the liquid level tilts during transport is reduced. As a result, the risk of more liquid being supplied to the first storage section than necessary is reduced. [Explanation of symbols]

[0113] 11...Liquid discharge device, 12...Head, 13...Nozzle, 14...Nozzle surface, 15...Liquid container, 16...Container member, 17...Outlet pipe, 18...Outlet valve, 21...Supply mechanism, 22...Mounting part, 23...Tank unit, 24...First connecting passage, 25...Second connecting passage, 26...First connecting valve, 27...Second connecting valve, 28...Pressurizing part, 29...Pump member, 30...Diaphragm, 31...Pressing member, 32...Pressure adjustment part, 33...Opening / closing part, 34...First air passage, 35...Second air passage, 36 …Third air passage, 37…Selector valve, 38…Air pump, 39…Pressure sensor, 40…Control unit, 41…First storage section, 42…Second storage section, 43…First storage body, 43A…First upper wall, 43B…First lower wall, 43C…First connecting side wall, 43D…First opposing side wall, 43DA…First upper side wall, 43DB…First lower side wall, 43DC…First connecting side wall, 43E…First front wall, 43F…First rear wall, 44…Second storage body, 44A…Second upper wall, 44B…Second lower wall, 44C…First 2 connecting side wall, 44D... second opposing side wall, 44DA... second upper side wall, 44DB... second lower side wall, 44DC... second connecting side wall, 44E... second front wall, 44F... second rear wall, 45... first storage space, 45A... first chamber, 45B... second chamber, 46... second storage space, 47... partition plate, 47A... first part, 47B... second part, 48... through port, 49... first liquid sensor, 50... second liquid sensor, 51... connecting flow path, 52... one-way valve, 53... first connecting pipe, 54... second connecting pipe, 5 5...First connection port, 56...Second connection port, 57...First atmospheric vent, 58...Second atmospheric vent, 59...First open pipe, 60...Second open pipe, 61...First open flow path, 62...Second open flow path, 63...First open member, 64...Second open member, 65...First open chamber, 66...Second open chamber, 67...First moisture-permeable membrane, 68...Second moisture-permeable membrane, 69...Inlet, 70...Guide pipe, 71...Guide valve, 72...Inlet pipe, 73...Inlet, 74...Tip portion, D1...First direction, D2...Second direction, D3...Vertical direction.

Claims

1. A tank unit configured to receive liquid from a liquid container and to store the liquid supplied to a head that discharges liquid, A storage section for storing liquid, An inlet that causes liquid to flow from the liquid container into the storage section due to the difference in hydrostatic head, The storage section is equipped with an atmospheric vent that opens the inside of the storage section to the atmosphere, The storage section is, A storage body that defines a storage space in which liquid is stored, The storage space is divided into a first chamber and a second chamber by a partition plate, The first chamber is a space located above the second chamber, and is a space that is connected to the atmosphere by the atmospheric opening. The inlet is an inlet pipe extending from the storage body toward the storage body, and has an inlet opening that communicates with the second chamber. The tank unit is characterized in that the partition plate has a through-hole that allows the first chamber and the second chamber to pass through.

2. The storage body is The upper wall on which the inlet pipe extends, The lower wall opposite the upper wall, The upper wall and the lower wall are connected to a connecting side wall, An opposing side wall connected to the upper wall and the lower wall, wherein the opposing side wall is opposite to the connecting side wall, The upper wall, the lower wall, the connecting side wall, and the front wall connected to the opposing side wall, The upper wall, the lower wall, the connecting side wall, and the rear wall connected to the opposing side wall, the rear wall facing the front wall, The tank unit according to claim 1, characterized in that the through-hole is positioned such that it does not overlap with the inlet when the storage body is viewed from a direction perpendicular to the front wall.

3. The storage body is The upper wall on which the inlet pipe extends, The lower wall opposite the upper wall, A connecting side wall connected to the upper wall and the lower wall, Opposing side walls connected to the upper wall and the lower wall, wherein the opposing side wall is opposite to the connecting side wall, The upper wall, the lower wall, the connecting side wall, and the front wall connected to the opposing side wall, The upper wall, the lower wall, the connecting side wall, and the rear wall connected to the opposing side wall, the rear wall facing the front wall, The tank unit according to claim 1, characterized in that the through-hole is positioned such that it does not overlap with the inlet when the storage body is viewed from a direction perpendicular to the connecting side wall.

4. The inlet pipe has a tip portion located within the storage body, The tank unit according to claim 1, characterized in that the partition plate is connected to the tip portion.

5. The tank unit according to claim 1, characterized in that the partition plate extends horizontally.

6. The aforementioned partition plate is, When the storage body is viewed from a direction perpendicular to the front wall, the first portion extends from the connecting side wall to the inlet pipe, When the storage body is viewed from a direction perpendicular to the front wall, it has a second portion that extends from the opposing side wall to the inlet pipe, The first portion is longer than the second portion when the storage body is viewed from a direction perpendicular to the front wall. The tank unit according to claim 2 or 3, characterized in that the through-hole opens to the second portion.

7. The tank unit according to claim 1, characterized in that the volume of the second chamber is smaller than the volume of the first chamber.

8. The storage body is The upper wall on which the inlet pipe extends, The lower wall opposite the upper wall, A connecting side wall connected to the upper wall and the lower wall, Opposing side walls connected to the upper wall and the lower wall, wherein the opposing side wall is opposite to the connecting side wall, The upper wall, the lower wall, the connecting side wall, and the front wall connected to the opposing side wall, The upper wall, the lower wall, the connecting side wall, and the rear wall connected to the opposing side wall, the rear wall facing the front wall, The opposing side wall is, The upper side wall defining the first chamber, It has a lower side wall that defines the second chamber, The tank unit according to claim 7, characterized in that, when the storage body is viewed from a direction perpendicular to the front wall, the distance from the connecting side wall to the upper side wall is greater than the distance from the connecting side wall to the lower side wall.

9. A connecting pipe for connecting the storage section to the head, comprising the connecting pipe having an opening for connection, The connecting pipe extends from the lower wall, The tank unit according to claim 2 or 3, characterized in that the through-hole is positioned so as not to overlap with the connection port when viewed from a vertical direction.

10. The tank unit according to claim 9, characterized in that, when the storage body is viewed from a direction perpendicular to the front wall, the distance from the connecting side wall to the connecting port is greater than the distance from the connecting side wall to the through port.

11. The tank unit according to claim 1, A liquid dispensing device characterized by comprising the head described above.

12. The storage section is the first storage section, The aforementioned atmospheric vent is a first atmospheric vent, The aforementioned tank unit is A second storage section from which liquid is supplied from the first storage section, A connecting channel connected to the first storage section and the second storage section, The second storage section is provided with a second atmospheric vent that opens the inside of the second storage section to the atmosphere, The aforementioned liquid discharge device is An opening / closing mechanism for opening and closing the second atmospheric vent, It comprises a control unit and, The liquid dispensing device according to claim 11, characterized in that the control unit closes the second atmospheric vent by controlling the opening / closing unit when it receives a transport instruction.

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