Tank unit and liquid discharge device

Abstract

The present application provides a tank unit and a liquid ejection apparatus capable of making the liquid levels of two storage chambers appropriate heights without implementing supply control or the like. The tank unit (26) includes a first introduction portion (60) that introduces liquid supplied from a liquid container, a first storage chamber (62) that stores the liquid introduced from the first introduction portion, and a first atmosphere opening portion (64) that can open the inside of the first storage chamber to the atmosphere. The tank unit includes a discharge flow passage (34) having one end connected to the first storage chamber and discharging the liquid in the first storage chamber, a second storage chamber (68) connected to the other end of the discharge flow passage and storing the liquid supplied from the first storage chamber, and a second atmosphere opening portion (69) that can open the inside of the second storage chamber to the atmosphere. The tank unit includes an on-off valve (36) that can open and close the discharge flow passage. The first introduction portion is connected to the first storage chamber via an opening portion (603) at a position halfway in the vertical direction of the first storage chamber.

Description

Technical Field

[0001] The present invention relates to a tank unit for containing liquid and a liquid dispensing device having the tank unit. Background Technology

[0002] Patent Document 1 discloses an inkjet printer as an example of a liquid ejection device equipped with a liquid ejection head that ejects liquids such as ink. This liquid ejection device includes a tank unit for collecting liquid. A liquid reservoir, such as a cartridge, is detachably mounted on the tank unit. The tank unit is configured to receive liquid supplied from the liquid reservoir and to direct the liquid toward the liquid ejection head. The liquid ejection head ejects the liquid supplied from the tank unit.

[0003] The tank unit disclosed in Patent Document 1 has two storage chambers. One is a first storage chamber for storing liquid introduced from a liquid container, and the other is a second storage chamber for storing liquid introduced from the first storage chamber. A liquid nozzle introduces liquid from the second storage chamber. In addition, the tank unit includes a supply valve, a liquid level sensor, and a circulation pump controlled by a control unit.

[0004] However, in the liquid ejection device described in Patent Document 1, complex supply control via a supply valve, a liquid level sensor, and a circulation pump is required to set the liquid levels in the two storage chambers to an appropriate height. Therefore, a tank unit and a liquid ejection device capable of adjusting the liquid levels in the two storage chambers to an appropriate height with a simple structure are desired.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-82536 Summary of the Invention

[0006] The tank unit that solves the above-mentioned problems is capable of introducing liquid supplied from a liquid reservoir and discharging liquid toward a liquid nozzle capable of spraying liquid. The tank unit includes: a first inlet for introducing liquid supplied from the liquid reservoir; a first storage chamber for storing the liquid introduced from the first inlet; a first atmospheric opening for opening the first storage chamber to the atmosphere; a discharge channel connected at one end to the first storage chamber; a second storage chamber connected to the other end of the discharge channel for storing liquid supplied from the first storage chamber; a second atmospheric opening for opening the second storage chamber to the atmosphere; and an on / off valve for opening and closing the discharge channel. The first inlet is connected to the first storage chamber via an opening at a midpoint in the vertical direction.

[0007] The liquid ejection device for solving the above-mentioned problem includes: a liquid ejection head capable of ejecting liquid; the aforementioned tank unit; a supply channel connecting the outlet and the liquid ejection head; and a recovery channel connecting the liquid ejection head and the second inlet. Attached Figure Description

[0008] Figure 1 This is a perspective view of the liquid ejection device in the embodiment.

[0009] Figure 2 This is a schematic diagram of the supply mechanism and drive mechanism of a liquid ejection device.

[0010] Figure 3 This is a perspective view of the liquid container involved in the embodiment.

[0011] Figure 4 for Figure 3 Rear view of the liquid container.

[0012] Figure 5 This is a schematic diagram of the supply unit involved in the implementation method.

[0013] Figure 6 To indicate that the liquid container is inserted into Figure 5 A cross-sectional view of the top region of the support component in the supply unit.

[0014] Figure 7 for Figure 6 A cross-sectional view of the support component in the connection position.

[0015] Figure 8 This is a side view of the tank unit.

[0016] Figure 9 A perspective view showing the periphery of the connection between the first and second storage sections.

[0017] Figure 10 This is a side sectional view of the tank unit.

[0018] Figure 11 This is a perspective view of the tank unit's mounting section as seen from the right side.

[0019] Figure 12 This is a perspective view of the tank unit's mounting section as seen from the left.

[0020] Figure 13 A perspective view showing the connecting parts that make up the mounting section.

[0021] Figure 14 This is a side sectional view of the connecting part.

[0022] Figure 15 This is a side sectional view of the main part of the tank unit.

[0023] Figure 16 This is a three-dimensional view of the valve body.

[0024] Figure 17 This is a side sectional view showing the periphery of the valve section.

[0025] Figure 18 This is a graph comparing the relationship between the reservoir pressure and sealing pressure associated with the valve body in the embodiment and the valve body in the comparative example.

[0026] Figure 19 This is a partial side view cut open to show the process of installing the liquid container into the mounting section of the tank unit with the correct orientation.

[0027] Figure 20 This is a partial side view showing the liquid container partially cut open when it is installed into the mounting section of the tank unit of the comparative example with the opposite orientation.

[0028] Figure 21 A partial side view cut out to show the liquid container being pushed into the mounting portion of the comparative example tank unit in the opposite direction and the top plate deflecting.

[0029] Figure 22 This is a partial side view showing the liquid container partially cut out and locked in place, which is installed into the mounting portion of the tank unit of the comparative example with the opposite orientation.

[0030] Figure 23 A partial side view cut out to show the process of the tank unit being installed into the mounting portion of the embodiment with the opposite orientation. Detailed Implementation

[0031] Hereinafter, embodiments of the can unit and the liquid ejection device having the can unit will be described with reference to the accompanying drawings. The liquid ejection device is, for example, an inkjet printer that performs printing by ejecting ink, an example of a liquid, onto a medium such as paper.

[0032] In the accompanying drawings, the liquid ejection device 11 is assumed to be placed on a horizontal plane, with the Z-axis representing the direction of gravity and the X and Y axes representing the directions along the horizontal plane. The X, Y, and Z axes are orthogonal to each other. When the user is facing the front of the liquid ejection device 11, the Y-axis represents the depth direction of the liquid ejection device 11, and the X-axis represents the width direction of the liquid ejection device 11.

[0033] Overall structure of the liquid ejection device

[0034] like Figure 1As shown, the liquid ejection device 11 may include: a media receiving unit 13 for receiving the media 12; a stacker 14 for receiving the printed media 12; and an operation unit 15 for operating the liquid ejection device 11. The operation unit 15 may be, for example, a touch panel. The operation unit 15, as a touch panel, may have a display unit 15a capable of displaying various operation screens, various information, etc. The liquid ejection device 11 may include an image reading unit 16 for reading images of the original document and an automatic feeding unit 17 for feeding the original document to the image reading unit 16.

[0035] The liquid dispensing device 11 includes a control unit 19 for controlling various actions performed within the liquid dispensing device 11. The control unit 19 can be configured as: 1) one or more processors operating according to a computer program (software); 2) one or more dedicated hardware circuits, such as dedicated hardware (Application-Specific Integrated Circuit: ASIC), that executes at least a portion of the various processes; or 3) a circuit including a combination of the above components. The processor includes a CPU and memories such as RAM and ROM, which store program code or instructions configured to cause the CPU to perform processes. Memory, or computer-readable medium, includes any usable medium accessible by a general-purpose or special-purpose computer.

[0036] The liquid dispensing device 11 includes a tank unit 26. The tank unit 26 may include a mounting portion 28 for detachably mounting one or more liquid containers 24. The mounting portion 28 may have multiple slots corresponding to the multiple liquid containers 24. The mounting portion 28 has an insertion port 28o for inserting the liquid container 24. The insertion port 28o is open, for example, facing the front of the liquid dispensing device 11. In this case, the liquid container 24 is inserted through the insertion port 28o, for example, from the front of the liquid dispensing device 11 in a direction along the Y-axis. The liquid dispensing device 11 may include a cover (not shown) that covers the insertion port 28o. This cover may be movable between a position covering the insertion port 28o and a position where the insertion port 28o is open.

[0037] Multiple liquid containers 24 (24C, 24M, 24Y, 24K) can each hold different types of liquids, such as inks of different colors. For example, liquid containers 24C, 24M, 24Y, and 24K can hold blue-green, magenta, yellow, and black inks, respectively. The liquid containers 24 can be configured to hold different amounts of liquid. For example, the liquid container 24K holding black ink can hold more liquid than the other liquid containers 24C, 24M, and 24Y. Alternatively, the width (i.e., length along the X-axis) of liquid container 24K can be longer than that of the other liquid containers 24C, 24M, and 24Y. Furthermore, the direction in which liquid containers 24 can be inserted into the tank unit 26 is not limited to the Y-axis direction; it can also be the X-axis direction, the Z-axis direction, or an inclined direction intersecting at an acute angle to at least one of the XYZ axes.

[0038] Structure of supply unit 25

[0039] Next, refer to Figure 2 The structure of the supply unit 25 will be described.

[0040] like Figure 2 As shown, the liquid ejection device 11 includes a liquid ejection head 23, a supply unit 25, and a supply channel 37, which supplies liquid from the supply unit 25 to the liquid ejection head 23.

[0041] The supply unit 25 includes a tank unit 26, which includes two storage sections 33 and 35 for storing liquid. The supply unit 25 may include a drive mechanism 27 for driving the tank unit 26.

[0042] The tank unit 26 is configured to receive liquid supplied from the liquid reservoir 24 and discharge the liquid toward the liquid nozzle 23 from which liquid can be sprayed. The tank unit 26 includes a first inlet 60, a first storage section 33, a second storage section 35, and a discharge channel 34 connecting the first and second storage sections 33. An on / off valve 36 is provided midway through the discharge channel 34. In the liquid flow direction when liquid is supplied from the liquid reservoir 24 to the liquid nozzle 23, the first storage section 33 is located upstream of the second storage section 35. The first storage section 33 functions as a sub-tank for temporarily storing the liquid received from the liquid reservoir 24. The second storage section 35 functions as a reservoir for temporarily storing the liquid discharged from the first storage section 33 until it is supplied to the liquid nozzle 23.

[0043] Liquid introduced from the liquid reservoir 24 in its installed state is stored in the first storage section 33. As liquid in the second storage section 35 is supplied to the liquid nozzle 23, when the liquid in the second storage section 35 is consumed, the on / off valve 36 opens, and liquid is replenished from the first storage section 33 to the second storage section 35 through the outlet flow channel 34. The on / off valve 36 can be a one-way valve. As a one-way valve, the on / off valve 36 allows flow of liquid from the first storage chamber 62 toward the outlet direction of the second storage chamber 68, and prevents flow of liquid from the second storage chamber 68 toward the first storage chamber 62.

[0044] The first storage unit 33 includes a first storage chamber 62 (sub-tank chamber) for storing liquid supplied from the liquid receiving body 24. Furthermore, the second storage unit 35 includes a second storage chamber 68 (liquid storage tank chamber) for storing liquid introduced from the first storage chamber 62 through the outlet channel 34 when the on / off valve 36 is opened. The first storage chamber 62 and the second storage chamber 68 are connected via the outlet channel 34. Although the on / off valve 36 provided on the outlet channel 34 can also be controlled by the control unit 19, in this embodiment, it is configured as a differential pressure valve that can be opened and closed using a water level difference. The detailed structure of the on / off valve 36 will be described below.

[0045] like Figure 2 As shown, the tank unit 26 configured in this manner, in addition to having a first inlet 60, a first storage chamber 62, an outlet channel 34, a second storage chamber 68, and an on / off valve 36, also includes a first atmospheric opening 64 and a second atmospheric opening 69. The first atmospheric opening 64 is configured to open the first storage chamber 62 to the atmosphere. The first atmospheric opening 64 has an opening above a first liquid surface 66, which is the liquid surface of the liquid stored in the first storage chamber 62. Furthermore, the second atmospheric opening 69 is configured to open the second storage chamber 68 to the atmosphere. The second atmospheric opening 69 has an opening above a second liquid surface 70, which is the liquid surface of the liquid stored in the second storage chamber 68.

[0046] The first atmospheric opening section 64 can also be configured to switch between an atmospheric open state, in which the first storage chamber 62 is open to the atmosphere, and a non-atmospheric open state, in which the first storage chamber 62 is not open to the atmosphere. Furthermore, the second atmospheric opening section 69 can also be configured to switch between an atmospheric open state, in which the second storage chamber 68 is open to the atmosphere, and a pressurized state, in which the second storage chamber 68 is pressurized at a pressure higher than atmospheric pressure.

[0047] The liquid dispensing device 11 includes a liquid nozzle 23 and a supply channel 37. The liquid nozzle 23 is capable of dispensing liquid, and the supply channel 37 connects the tank unit 26, configured as described above, to the liquid nozzle 23. Liquid in the tank unit 26 is supplied to the liquid nozzle 23 through the supply channel 37. The liquid nozzle 23 dispenses the liquid supplied from the tank unit 26 through the supply channel 37. Furthermore, the liquid dispensing device 11 may include a recovery channel 39 connecting the liquid nozzle 23 and the tank unit 26. That is, the liquid dispensing device 11 may include a supply channel 37 and a recovery channel 39, with the supply channel 37 supplying liquid from the tank unit 26 to the liquid nozzle 23, and the recovery channel 39 recovering liquid from the liquid nozzle 23 back to the tank unit 26. Thus, the liquid dispensing device 11 can be a structure in which liquid circulates between the tank unit 26 and the liquid nozzle 23 through the supply channel 37 and the recovery channel 39.

[0048] Alternatively, the liquid can be circulated between the tank unit 26 and the liquid nozzle 23 by means of a heater (not shown), thereby allowing liquid at a predetermined temperature to be ejected from the liquid nozzle 23. Furthermore, in the case of a liquid composed of pigment-based ink, circulating the liquid between the tank unit 26 and the liquid nozzle 23 can suppress pigment sedimentation by utilizing the agitation effect of the circulated liquid, thereby allowing a liquid with uniformly dispersed pigment to be ejected from the liquid nozzle 23. Of course, the liquid can also be circulated between the tank unit 26 and the liquid nozzle 23 for other purposes.

[0049] The liquid dispensing device 11 may also include a liquid dispensing head 23, a tank unit 26, a supply channel 37, a second inlet 75, and a recovery channel 39. The tank unit 26 may also include a discharge section 74 and a second inlet 75. The discharge section 74 discharges liquid stored inside the tank unit 26 to the liquid dispensing head 23 through the supply channel 37, and the second inlet 75 receives liquid recovered from the liquid dispensing head 23 through the recovery channel 39. The supply channel 37 connects the discharge section 74 and the liquid dispensing head 23. The recovery channel 39 connects the liquid dispensing head 23 and the second inlet 75.

[0050] like Figure 2 As shown, the structure can also be as follows: when the liquid ejection device 11 uses a liquid circulation method, the liquid in the second storage chamber 68 is discharged to the liquid ejection head 23 through the supply channel 37, and the liquid from the liquid ejection head 23 is introduced into the first storage chamber 62 through the recovery channel 39. In this case, the discharge section 74 can also be provided on the second storage section 35, and the second inlet section 75 can be provided on the first storage section 33 (see reference). Figure 8 , Figure 10 ).

[0051] The liquid nozzle 23 has one or more nozzles 22 and nozzle surfaces 21 through which these nozzles 22 open. The tank unit 26 is configured to supply liquid contained in the liquid reservoir 24 to the liquid nozzle 23 through a first storage section 33, a discharge channel 34, a second storage section 35, and a supply channel 37. The liquid nozzle 23 is configured to spray the supplied liquid from the nozzles 22.

[0052] If the liquid ejection device 11 has multiple supply units 25 corresponding to different colors, it can eject inks of multiple colors to perform color printing. A single drive mechanism 27 can drive multiple canister units 26 simultaneously. Alternatively, the liquid ejection device 11 may have multiple drive mechanisms 27 that drive multiple canister units 26 independently.

[0053] The liquid ejector head 23 can also be detachably mounted relative to the main body of the liquid ejection device 11. The liquid ejector head 23 can also be configured such that the nozzle surface 21 is tilted relative to the horizontal. The liquid ejector head 23 can also perform printing by ejecting liquid onto the medium 12 in an tilted posture. The liquid ejector head 23 can also be a row type that spans the width direction of the medium 12. The liquid ejector head 23 can also be a serial type that performs printing while moving along the width direction of the medium 12.

[0054] The liquid reservoir 24 may also include a storage chamber 29 for storing liquid. The liquid stored in the storage chamber 29 is discharged through an outlet 30. The outlet 30 may have an outlet valve 31. The storage chamber 29 may be, for example, a sealed space that is not connected to the atmosphere. The liquid reservoir 24 installed before the mounting section 28 may also store a larger amount of liquid than the tank unit 26 can hold.

[0055] The supply unit 25 may include: a supply valve 38 capable of closing the supply channel 37; a recovery channel 39; a circulation valve 40 capable of opening and closing the recovery channel 39; and a liquid chamber 41. The liquid chamber 41 is disposed midway through the recovery channel 39. The recovery channel 39 has an upstream end connected to the liquid nozzle 23 and a downstream end connected to the first storage section 33. The recovery channel 39 is a channel for causing liquid in the liquid nozzle 23 to flow toward the tank unit 26.

[0056] The liquid chamber 41 is positioned midway through the recovery channel 39, between the liquid nozzle 23 and the circulation valve 40. A portion of the liquid chamber 41 is defined by a flexible member 42. The volume of the liquid chamber 41 changes by flexing and deforming through the flexible member 42.

[0057] The liquid nozzle 23 may have a first connecting portion 44 connected to the recovery channel 39 and a second connecting portion 45 connected to the supply channel 37. The recovery channel 39 has an upstream end connected to the first connecting portion 44 and a downstream end connected to the first storage section 33. The supply channel 37 has an upstream end connected to the second storage section 35 and a downstream end connected to the second connecting portion 45. It may be configured such that, when the liquid nozzle 23 is in an inclined position, the first connecting portion 44 is positioned higher than the second connecting portion 45.

[0058] like Figure 2 As shown, the liquid ejection device 11 may further include a pressurizing section 47, which communicates with the second atmospheric opening section 69 and is capable of pressurizing the second storage chamber 68. That is, the drive mechanism 27 may include a pressurizing section 47 capable of pressurizing the second storage chamber 35. The drive mechanism 27 may also include a switching mechanism 48 connected to the pressurizing section 47 and a pressure sensor 49 for detecting pressure. The drive mechanism 27 may also include: an atmospheric opening channel 50 connected to the first storage chamber 33; a pressurizing flow channel 51 connected to the second storage chamber 68; and a connecting flow channel 52 connecting the atmospheric opening channel 50 and the pressurizing flow channel 51 to the pressurizing section 47. The drive mechanism 27 may also include: an air chamber 53 separated from the liquid chamber 41 by a flexible member 42; a spring 54 disposed within the air chamber 53; and an air flow channel 55 connected to the air chamber 53. The spring 54 reduces pressure fluctuations in the liquid within the recovery channel 39 and the liquid nozzle 23 by pressing the flexible member 42.

[0059] The pressurizing unit 47 is, for example, a pipe pump having rollers and a tube. In this case, air is delivered by rotating the rollers while pressing and crushing the tube. The pipe (not shown) of the pressurizing unit 47 has a first end connected to the air flow channel 55 and a second end connected to the connecting flow channel 52. When driven in forward rotation, the pressurizing unit 47 delivers air drawn in from the air flow channel 55 to the connecting flow channel 52. When driven in reverse rotation, the pressurizing unit 47 delivers air drawn in from the connecting flow channel 52 to the air flow channel 55.

[0060] The supply unit 25 may also include a pressurizing mechanism 57 configured to pressurize the liquid within the supply channel 37. The pressurizing mechanism 57 may include, for example, a pressurizing section 47, an air chamber 53, and an air channel 55. The supply unit 25 may also include a micro-pressurizing section 58 disposed midway through the recovery channel 39, between the liquid nozzle 23 and the circulation valve 40. The micro-pressurizing section 58 is configured to include the pressurizing mechanism 57 and a liquid chamber 41, and pressurizes the liquid within the recovery channel 39. More specifically, the pressurizing mechanism 57 pressurizes the flexible member 42 from the outside of the liquid chamber 41.

[0061] First Storage Section 33

[0062] Next, the first storage section 33 will be described.

[0063] The first storage section 33 may include a first inlet section 60, a first storage chamber 62, a liquid level detection section 63, and a first atmospheric opening section 64. The first inlet section 60 may include an inlet valve 61.

[0064] When the liquid container 24 is installed into the mounting portion 28 of the tank unit 26 (see reference) Figure 1 When the liquid reservoir 24 is installed in the mounting section 28, the outflow section 30 and the first inflow section 60 are connected, and the outflow valve 31 and the inflow valve 61 are open. When the liquid reservoir 24 is installed in the mounting section 28, both valves 31 and 61 remain open. During the installation of the liquid reservoir 24 into the mounting section 28, the inflow valve 61 may open before the outflow valve 31. This makes it difficult for liquid to leak from the liquid reservoir 24.

[0065] The first inlet 60 introduces the liquid supplied from the liquid reservoir 24. The first inlet 60 may be disposed in the upper part of the first storage section 33. The first inlet 60 may also penetrate the top wall 65 of the first storage chamber 62, for example. The lower end of the first inlet 60 may be disposed within the first storage chamber 62, located below the top wall 65. The upper end of the first inlet 60 may be disposed outside the first storage chamber 62, located above the top wall 65. Furthermore, an example of the detailed structure of the first inlet 60 and the first storage chamber 62 is described below.

[0066] The first storage chamber 62 stores the liquid introduced from the first inlet 60. The lower end of the first inlet 60 is located below the nozzle surface 21. Therefore, the first liquid level 66 of the liquid stored in the first storage chamber 62 varies within a range below the nozzle surface 21. Specifically, the liquid in the liquid receiver 24 flows into the first storage chamber 33 via the outlet 30 and the first inlet 60 due to the water level difference between the liquid in the liquid receiver 24 and the liquid in the first storage chamber 33.

[0067] The first atmospheric opening 64 is configured to open the first storage chamber 62 to the atmosphere. For example, the first atmospheric opening 64 is made of a gas-liquid separation membrane. Here, the gas-liquid separation membrane refers to a membrane material that has the function of preventing liquid from passing through while allowing gas to pass through. Through the first atmospheric opening 64, the leakage of liquid in the first storage chamber 62 to the outside is prevented while allowing air to enter and exit between the first storage chamber 62 and the outside. Thus, since the first storage chamber 62 is open to the atmosphere, the first liquid level 66 changes due to the introduction of liquid from the liquid reservoir 24 via the first inlet 60 and the discharge of liquid through the outlet channel 34.

[0068] One end of the outlet channel 34 is connected to the first storage chamber 62 to outlet the liquid in the first storage chamber 62.

[0069] The on / off valve 36 is configured to open and close the outlet flow channel 34. The on / off valve 36 may include a one-way valve that allows the flow of liquid from the first storage chamber 62 toward the second storage chamber 68 and restricts the flow from the second storage chamber 68 toward the first storage chamber 62. Furthermore, the detailed structure of the on / off valve 36 will be described below.

[0070] When liquid in the liquid reservoir 24 flows into the first storage section 33 via the outflow section 30 and the first inflow section 60, an amount of air equivalent to the amount of liquid flowing into the first storage section 33 flows from the first storage section 33 into the liquid reservoir 24 via the first inflow section 60 and the outflow section 30. Simultaneously, the first liquid level 66 rises with the amount of liquid flowing in. When the risen first liquid level 66 reaches the lower end of the first inflow section 60, the flow of air from the first storage section 33 into the liquid reservoir 24 stops. Because the storage chamber 29 is sealed, when the airflow stops, the pressure inside the storage chamber 29 decreases with the amount of liquid flowing in. When the negative pressure inside the storage chamber 29 becomes greater than the water level of the liquid inside the storage chamber 29, the flow of liquid from the liquid reservoir 24 into the first storage section 33 stops.

[0071] As liquid flows from the first storage section 33 to the second storage section 35, the first liquid level 66 drops. When the dropped first liquid level 66 falls below the lower end of the first inlet section 60, air flows into the receiving chamber 29 via the first inlet section 60 and the outlet section 30, thereby reducing the negative pressure within the receiving chamber 29. When the negative pressure within the receiving chamber 29 becomes less than the liquid level within the receiving chamber 29, liquid in the liquid receiving body 24 flows into the first storage section 33. As a result, during the period when liquid is present in the liquid receiving body 24, the first liquid level 66 is maintained at a standard position SH, which is near the lower end of the first inlet section 60. When the liquid in the liquid receiving body 24 is depleted, the first liquid level 66 drops below the standard position SH.

[0072] The tank unit 26 also includes a liquid level detection unit 63, which can detect the liquid level in the first storage chamber 62. The liquid level detection unit 63 can detect when the first liquid level 66 is at the standard position, when the first liquid level 66 is below the standard position, and when the first liquid level 66 is at the full position. The full position is above the standard position SH. When the first liquid level 66 is at the full position, the first storage chamber 33 stores the maximum amount of liquid. The control unit 19 can determine that the liquid container 24 is empty when the liquid level detection unit 63 detects that the first liquid level 66 is below the standard position SH, and instruct the user to replace the liquid container 24.

[0073] The standard position SH is, for example, set above the downstream end of the recovery channel 39 in the first storage chamber 62. In this case, when the first liquid level 66 is at the standard position SH, the liquid in the first storage section 33 can flow into the liquid nozzle 23 through the recovery channel 39.

[0074] Structure of the second storage section 35

[0075] Next, the second storage section 35 will be described.

[0076] The second storage chamber 68 is connected to the other end of the outlet channel 34 and stores the liquid supplied from the first storage chamber 62. The second storage section 35 may also have a second storage chamber 68 and a second atmospheric opening section 69, which separates the second storage chamber 68 from the pressurized channel 51.

[0077] The second atmospheric opening 69 is configured to open the second storage chamber 68 to the atmosphere. The second atmospheric opening 69 is, for example, made of a gas-liquid separation membrane. This gas-liquid separation membrane, like the gas-liquid separation membrane constituting the first atmospheric opening 64, is a membrane material that allows gas to pass through while preventing liquid from passing through.

[0078] The liquid in the first storage section 33 flows into the second storage chamber 68 due to the water level difference between it and the liquid in the second storage section 35. When the pressure in both the first storage chamber 62 and the second storage chamber 68 is atmospheric pressure, the second liquid level 70 of the liquid stored in the second storage section 35 will be at the same height as the first liquid level 66. In other words, the second liquid level 70 is maintained at a standard position SH, which is approximately the same height as the lower end of the first inlet section 60, and varies within a range below the nozzle surface 21. The liquid in the liquid nozzle 23 is maintained at a negative pressure due to the water level difference between the liquid in the first storage section 33 and the liquid in the second storage section 35. When the liquid in the liquid nozzle 23 is consumed, the liquid stored in the second storage section 35 is supplied to the liquid nozzle 23.

[0079] When the on / off valve 36 includes a check valve, the check valve will close the outlet passage 34 when the pressure in the second storage section 35 is greater than the pressure in the first storage section 33. Therefore, when the pressurizing section 47 pressurizes the second storage section 35, the check valve will block the outlet passage 34.

[0080] Control Unit 19 (Reference) Figure 1 The system controls the opening and closing of the supply valve 38 and the circulation valve 40. The supply valve 38 can open and close the supply channel 37 when pressurized by the pressurization unit 47. The circulation valve 40 can open and close the recovery channel 39.

[0081] Structure of switching mechanism 48

[0082] Next, the switching mechanism 48 will be explained.

[0083] The switching mechanism 48 includes a thin tube section 72 as part of the connecting flow channel 52, and first selection valves 73a to eleventh selection valves 73k. The thin tube section 72 is a tortuous tube so thin that the flow of liquid is greatly restricted relative to the flow of air.

[0084] When the first selector valve 73a is open, the air passage 55 is connected to the atmosphere. When the second selector valve 73b is open, the air passage 55 is connected to the pressure sensor 49. When the third selector valve 73c is open, the air passage 55 is opened, and the pressurization section 47 is connected to the air chamber 53.

[0085] When the fourth selector valve 73d is opened, the connecting passage 52 between the pressurizing section 47 and the eighth selector valve 73h is connected to the atmosphere. When the fifth selector valve 73e is opened, the connecting passage 52 is connected to the pressure sensor 49. When the sixth selector valve 73f and the seventh selector valve 73g are opened, the connecting passage 52 is connected to the atmosphere. When the eighth selector valve 73h is opened, the connecting passage 52 is open. When the ninth selector valve 73i is opened, the thin tube section 72 is connected to the atmosphere. When the tenth selector valve 73j is opened, the atmospheric opening passage 50 is opened, and the first storage section 33 is connected to the connecting passage 52. When the eleventh selector valve 73k is opened, the pressurizing passage 51 is opened, and the second storage section 35 is connected to the connecting passage 52.

[0086] When the pressure inside the air chamber 53 is changed, the switching mechanism 48 opens the second selector valve 73b to the fourth selector valve 73d and closes the other selector valves. In this state, when the pressurizing unit 47 is driven in the forward direction, the air inside the air chamber 53 is discharged through the air passage 55 and the connecting passage 52, thereby reducing the pressure inside the air chamber 53. In this state, when the pressurizing unit 47 is driven in the reverse direction, air is sent into the air chamber 53 through the connecting passage 52 and the air passage 55, thereby increasing the pressure inside the air chamber 53. At this time, the pressure sensor 49 can also detect the pressure in the air passage 55 and the air chamber 53. Control unit 19 (see reference) Figure 1 The drive of the pressurization unit 47 can also be controlled based on the detection results of the pressure sensor 49.

[0087] With the first storage section 33 open to the atmosphere, the switching mechanism 48 opens the sixth selection valve 73f and the tenth selection valve 73j. The first storage chamber 62 is connected to the atmosphere through the atmosphere opening channel 50 and the connecting flow channel 52.

[0088] With the second storage section 35 open to the atmosphere, the switching mechanism 48 opens the seventh selection valve 73g and the eleventh selection valve 73k. The second storage chamber 68 is connected to the atmosphere through the pressurized flow channel 51 and the connecting flow channel 52.

[0089] When the second storage compartment 35 is pressurized, the switching mechanism 48 opens the first selection valve 73a, the fifth selection valve 73e, the eighth selection valve 73h, and the eleventh selection valve 73k, and closes the other selection valves. In this state, when the pressurizing unit 47 is driven in the forward direction, air flows into the second storage chamber 68 through the air flow channel 55, the connecting flow channel 52, and the pressurizing flow channel 51, thereby increasing the pressure in the second storage chamber 68. At this time, the pressure sensor 49 can also detect the pressure in the connecting flow channel 52, the pressurizing flow channel 51, and the second storage chamber 68. The control unit 19 can also control the drive of the pressurizing unit 47 based on the detection result of the pressure sensor 49.

[0090] Structure of liquid reservoir 24

[0091] Next, refer to Figure 3 as well as Figure 4 The structure of the liquid container 24 will be explained.

[0092] like Figure 3 as well as Figure 4As shown, the liquid reservoir 24 is, for example, a box having a first end wall 142, an upper wall 143, a bottom wall 144, a first side wall 145, a second side wall 146, and a second end wall 147. When the liquid reservoir 24 is installed into the liquid dispensing device 11, it is inserted starting from the first end wall 142.

[0093] like Figure 3 As shown, the liquid container 24 may have an identification portion 430 on its bottom wall 144 for identifying the type of the liquid container 24. The identification portion 430 may be, for example, a plurality of protrusions arranged in the width direction.

[0094] The liquid reservoir 24 may have a positioning hole 448 on its bottom wall 144. The positioning hole 448 may be a recess that opens in the bottom wall 144. The liquid reservoir 24 may have an outlet 30 that opens in the bottom wall 144. Liquid contained in the liquid reservoir 24 is discharged from the liquid reservoir 24 through the outlet 30. The liquid reservoir 24 may have a release portion 241 that protrudes downward from the bottom wall 144. The release portion 241, the positioning hole 448, and the outlet 30 may be arranged sequentially from the second end wall 147 toward the first end wall 142.

[0095] like Figure 3 As shown, the liquid reservoir 24 may have a circuit board 150 at the cut-out portion where the bottom wall 144 and the first end wall 142 intersect. The circuit board 150 may have connection terminals 521 and a storage medium 525. The storage medium 525 may store information related to the liquid reservoir 24, such as information related to the liquid contained in the liquid reservoir 24.

[0096] The liquid reservoir 24 may have two receiving portions 447 extending along the Y-axis on the first sidewall 145 and the second sidewall 146, respectively. In each sidewall 145, 146, the receiving portion 447 may include a first receiving portion 447a and a second receiving portion 447b with different heights. The first receiving portion 447a may be a groove extending along the bottom wall 144. The second receiving portion 447b is located above the first receiving portion 447a and is shorter along the Y-axis than the first receiving portion 447a. The second receiving portion 447b may be disposed near the circuit board 150.

[0097] like Figure 4 As shown, the liquid reservoir 24 has an engaging portion 497 on the second end wall 147. The engaging portion 497 is, for example, a recess located above the release portion 241 and opening in the second end wall 147. The engaging portion 497 may be located at the center in the width direction of the second end wall 147.

[0098] Structure of mounting section 28

[0099] like Figure 5 As shown, the mounting portion 28 includes a box-shaped frame 80, a support member 90, a rotating shaft 91, and a first inlet portion 60. The support member 90, the rotating shaft 91, and the first inlet portion 60 are disposed within the frame 80. The liquid reservoir 24 is inserted into the frame 80 through the insertion port 28o and moves toward the depth of the frame 80. The direction of movement of the liquid reservoir 24 at this time, that is, the insertion direction toward the mounting portion 28, is along the Y-axis.

[0100] The support component 90 follows a straight guide path 82 that intersects the vertical line (Z-axis). Figure 5 (Indicated by a blank arrow in the middle) extends along the direction of movement (Y-axis). The guide path 82 extends along the direction of movement (Y-axis). The support member 90 has a top region where the beginning of the guide path 82 is located and a base region where the end of the guide path 82 is located. The base region of the support member 90 and the rotation shaft 91 are disposed deep inside the frame 80, i.e., away from the insertion port 28°. The support member 90 may have a base plate 90a and two side ribs 90b. The two side ribs 90b are respectively disposed at both ends of the base plate 90a in the width direction.

[0101] The rotating shaft 91 has an axis that intersects both the vertical line (Z-axis) and the guide path 82 (Y-axis) and is located at the base end region of the support member 90. The axis of the rotating shaft 91 extends along the X-axis. The support member 90 is configured to guide the liquid reservoir 24 along the guide path 82 at the guide position (in Figure 5 (represented by a single-dot dash), and the connection position where the liquid reservoir 24 connects to the first inlet 60 (in... Figure 5 (represented by a double-dotted line) between them, rotating around the axis 91.

[0102] The first inlet 60 is disposed below the support member 90. When the support member 90 is in the connected position, the first inlet 60 is connected to the liquid reservoir 24. The first inlet 60 can be disposed in an inclined position relative to the guide path 82 (horizontal). More specifically, the first inlet 60 can be inclined such that its top end (upper end) is disposed closer to the insertion port 28° than its base end (lower end). For example, the first inlet 60 can be configured such that its axis forms an angle greater than 0 degrees and less than 15 degrees relative to the vertical line (Z-axis).

[0103] The support member 90 may have one or more guide portions 247 that guide the movement of the liquid reservoir 24. The guide portion 247 may be, for example, a pair of guide rails disposed on a pair of side ribs 90b, or a single guide rail disposed on the base plate 90a.

[0104] The guide portion 247 may have a first guide portion 247a and a second guide portion 247b configured to engage with the first receiving portion 447a and the second receiving portion 447b, respectively. The guide portions 247a and 247b may, for example, be protrusions extending along the long side of the support member 90. The second guide portion 247b is located above the first guide portion 247a and is shorter along its long side than the first guide portion 247a. The second guide portion 247b may also be configured closer to the rotation axis 91 than the first guide portion 247a. The first guide portion 247a may also be configured in the direction of movement of the liquid reservoir 24 at a position corresponding to the first inlet portion 60.

[0105] The mounting portion 28 may also include a first force-applying member 83, which applies force to the support member 90 from the connection position toward the guide position. The first force-applying member 83 is, for example, a coil spring. In the initial state where the liquid reservoir 24 is not in the mounting portion 28, the support member 90 is positioned in the guide position by the force applied by the first force-applying member 83.

[0106] like Figure 6 As shown, the mounting portion 28 may have an upwardly projecting positioning protrusion 248 near the first inlet portion 60. The liquid reservoir 24 is positioned by engaging with the positioning protrusion 248 through its positioning hole 448. The positioning protrusion 248 may be tilted at the same angle as the first inlet portion 60. Base plate 90a (see reference) Figure 5 In the part corresponding to the upper part of the positioning protrusion 248 and the first inlet part 60, a cut is made.

[0107] like Figure 6 As shown, the mounting portion 28 may include a locking rod 84, which is configured to face the top end of the support member 90. The locking rod 84, the positioning protrusion 248, and the first guide portion 60 may be arranged sequentially along the Y-axis. The locking rod 84 may have a base end (lower end) and a top end (upper end) fixed to the frame 80. The mounting portion 28 may include a second force-applying member 85, which applies force to the top end of the locking rod 84 toward the support member 90.

[0108] The engaging lever 84 is configured to engage with the liquid reservoir 24 supported by the support member 90 when the support member 90 is in the connected position. The engaging lever 84 may have a first inclined surface 86 extending obliquely downward from its top end and a second inclined surface 87 extending obliquely downward from the lower end of the first inclined surface 86. The first inclined surface 86 and the second inclined surface 87 define a protrusion projecting toward the support member 90.

[0109] The first inclined surface 86 is along the support member 90 from the guide position ( Figure 6The position shown is oriented towards the connection position. Figure 7 When rotating along the rotation path (as shown), it engages with the liquid reservoir 24. The second inclined surface 87 engages with the liquid reservoir 24 when the support member 90 is in the connected position and when the support member 90 rotates from the connected position toward the guide position.

[0110] Next, refer to Figure 6 , Figure 7 The structure of the outlet valve 31 of the outflow section 30 and the inlet valve 61 of the first inlet section 60 will be described.

[0111] like Figure 6 As shown, the outlet valve 31 on the liquid reservoir 24 side includes a valve body 31a and an elastic member 31b, which is positioned outwards relative to the valve body 31a (in...). Figure 6 Force is applied to the lower side (in the middle). Due to the force applied by the elastic member 31b, the valve body 31a is positioned... Figure 6 When the valve is in the outermost closed position as shown, outlet valve 31 is closed. Furthermore, as... Figure 7 As shown, when the valve body 31a resists the force applied by the elastic member 31b, it moves inward (in... Figure 7 When the middle (top) is pushed in, the outlet valve 31 opens.

[0112] In addition, such as Figure 6 As shown, the inlet valve 61 on the first inlet section 60 side includes a valve body 61a and an elastic member 61b, the elastic member 61b being positioned outwards relative to the valve body 61a (in... Figure 6 Force is applied to the upper side (center). When the valve body 61a is positioned due to the force applied by the elastic member 61b... Figure 6 When the valve is in the outermost closed position as shown, the inlet valve 61 is closed. Furthermore, as... Figure 7 As shown, when the valve body 61a resists the force applied by the elastic member 61b, it moves inward (in... Figure 7 When the middle (bottom) is pushed in, the inlet valve 61 opens.

[0113] like Figure 6 As shown, the valve body 31a of the outlet valve 31 has a protrusion 31c at its top end. Figure 7 As shown, with the liquid reservoir 24 installed on the mounting portion 28, the protrusion 31c of the valve body 31a pulls the valve body 61a of the inlet valve 61 inward (in... Figure 7 (Push in from the bottom). At this time, the valve body 31a of the outlet valve 31 is pushed upward. As a result, with the liquid reservoir 24 installed on the mounting part 28, the outlet part 30 and the first inlet part 60 are connected with both the outlet valve 31 and the inlet valve 61 open.

[0114] Function of supply unit 25

[0115] The function of the liquid reservoir 24 when it is installed in the supply unit 25 will be explained.

[0116] like Figure 5 As shown, the liquid reservoir 24 is inserted into the frame 80 through the insertion port 28o. When the first receiving part 447a of the liquid reservoir 24 engages with the first guide part 247a within the frame 80, the liquid reservoir 24 is guided by the first guide part 247a, thereby moving horizontally along the guide path 82 along the Y-axis. At this time, the movement of the liquid reservoir 24 in the width direction is restricted by the two first guide parts 247a arranged side by side in the width direction. Furthermore, midway through the guide path, the upward movement of the liquid reservoir 24 is restricted by the frame 80, and the downward movement of the liquid reservoir 24 is restricted by the locking lever 92 (see reference). Figure 7 (and thus restricted.)

[0117] When the liquid reservoir 24 reaches near the end of the guide path 82, the second receiving portion 447b engages with the second guide portion 247b. An electrical connection portion (not shown) can be disposed between the first guide portion 247a and the second guide portion 247b in the vertical direction Z. In this case, the connection terminal 521 is appropriately positioned in the vertical direction Z towards the electrical connection portion. The liquid reservoir 24 can be positioned in the width direction by the identifying shape disposed near the electrical connection portion.

[0118] When the liquid reservoir 24 reaches the end of the guide path 82, the connection terminal 521 contacts the electrical connection portion. This allows the circuit board 150 and the control unit 19 (see reference 1) to connect. Figure 1 Data communication is conducted between them. At this time, the second end wall 147 of the liquid reservoir 24 is exposed outside the frame 80, or is in a position where it can be operated from outside the frame 80.

[0119] Next, the operator presses the liquid reservoir 24 against the force applied by the fourth force-applying component (not shown) in the insertion direction while simultaneously pressing the rear end of the liquid reservoir 24 (in...) Figure 5 (The middle part is the right end) is pressed downwards. Thus, the support member 90 resists the force applied by the first force-applying member 83 and moves towards the rotation axis 91. Figure 4 The liquid reservoir 24 rotates clockwise. During this rotation, the positioning protrusion 248 first enters the positioning hole 448 (see reference). Figure 6 , Figure 7 Then, the outflow section 30 is connected to the first inflow section 60.

[0120] At this time, the extension and retraction of the force spring (not shown) allows for slight displacement of the liquid reservoir 24 along the Y-axis while maintaining the connection between the connection terminal 521 and the electrical connection (not shown). Since the positioning protrusion 248 is positioned near the first inlet 60 and inclined at the same angle as the first inlet 60, the outflow portion 30 is properly guided toward the first inlet 60.

[0121] As the support member 90 rotates towards the connection position, the liquid reservoir 24 supported by the support member 90 contacts the first inclined surface 86 of the engaging rod 84. The upper end of the engaging rod 84, pressed by the liquid reservoir 24, resists the force applied by the second force-applying member 85, and moves outward from the rotation path of the support member 90 (in... Figure 5 The displacement is in the manner of deviation (right side). When the protrusion of the engaging rod 84 engages with the engaging part 497 of the liquid reservoir 24, the support member 90 is held in the connection position by the force applied by the second force-applying member 85. Thus, the installation of the liquid reservoir 24 is completed.

[0122] like Figure 7 As shown, when the liquid collection body 24 is installed, the outflow portion 30 is connected to the first inflow portion 60. At this time, both the outflow valve 31 and the inflow valve 61 are in the open state. Since the liquid collection body 24 is positioned above the first inflow portion 60, the liquid in the liquid collection body 24 is introduced into the first storage portion 33 through the first inflow portion 60 due to the water level difference.

[0123] Next, the function of the liquid reservoir 24 when it is removed from the supply unit 25 will be explained.

[0124] When the liquid reservoir 24 is removed from the mounting part 28, the rear end of the liquid reservoir 24 (at Figure 5 The support member 90 (right end) is lifted upwards against the force applied by the second force-applying member 85. At this time, because the engaging part 497 engages with the second inclined surface 87, the support member 90 rotates smoothly together with the liquid reservoir 24. When the protrusion of the engaging rod 84 disengages from the engaging part 497, the support member 90 rotates from the connecting position to the guiding position about the rotation axis 91 by the force applied by the first force-applying member 83.

[0125] As the support member 90 rotates from the connecting position to the guiding position, the outflow portion 30 leaves the first inlet portion 60, and the positioning protrusion 248 disengages from the positioning hole 448. At this time, as the outflow portion 30 leaves the first inlet portion 60, both the outlet valve 31 and the inlet valve 61 close. Furthermore, when the support member 90 reaches the guiding position, the liquid reservoir 24 is pushed towards the beginning of the guiding path by the force applied by the fourth force-applying member (not shown). At this time, since the liquid reservoir 24 is guided by the first guide portion 247a and the second guide portion 247b, the connecting terminal 521 quickly leaves the electrical connection portion (not shown) on the mounting portion 28 side without deformation. Simultaneously, the release portion 241 disengages from the first arm portion (not shown), and the locking lever 92 returns to the locked position by the force applied by the third force-applying member (not shown).

[0126] Then, when the operator pulls the liquid reservoir 24 outward from the frame 80, the liquid reservoir 24 is guided by the first guide 247a. At this time, since the rotation of the support member 90 is restricted by the locking rod 92, the liquid reservoir 24 moves horizontally along the Y-axis without contacting the first guide 60.

[0127] Detailed structure of tank unit 26

[0128] Next, refer to Figure 8 , Figure 10 The detailed structure of tank unit 26 is explained below.

[0129] like Figure 8 , Figure 10 As shown, the tank unit 26 includes a first inlet 60, a first storage chamber 62, and a second storage chamber 68. Furthermore, the first storage chamber 62 and the second storage chamber 68 are formed into chambers by attaching films F1 and F2 to the sides of the synthetic resin frame constituting the storage section of the tank unit 26.

[0130] The first inlet 60 is configured to be able to contact the liquid reservoir 24 (see reference 28) mounted on the mounting section 28. Figure 2 The liquid reservoir 24 is connected to the mounting portion 28. When the liquid reservoir 24 is installed onto the mounting portion 28, the first inlet portion 60 and the outlet portion 30 of the liquid reservoir 24 (see reference) are connected. Figure 2 Connect the liquid to the liquid reservoir 24. In this installed state, liquid from the liquid reservoir 24 is introduced into the first storage chamber 62 via the first inlet 60.

[0131] like Figure 8 , Figure 10As shown, the first inlet 60 is connected to the first storage chamber 62 via an opening 603 at a midpoint in the vertical direction Z of the first storage chamber 62. The first inlet 60 has an inlet channel 601 that serves as a flow path for liquid introduced from the liquid reservoir 24. The inlet channel 601 can be as follows: Figure 8 , Figure 10 As shown, it extends obliquely downward relative to the vertical direction Z, or it can extend in the vertical direction Z. The first inlet 60 has an opening 603 at the downstream end of the inlet channel 601 in the direction of liquid introduction. Figure 8 , Figure 10 In the example shown, the first inlet 60 is connected to the liquid reservoir 24 (see reference 28) mounted on the mounting section 28. Figure 2 An opening 603, opening at the end opposite to the liquid inlet 60a, connects to the first storage chamber 62. Thus, the first inlet 60 connects to the first storage chamber 62 via the opening 603 at its downstream end in the direction of liquid introduction from the liquid reservoir 24, within the inlet channel 601 that passes through it. The opening 603 may also have an opening surface like... Figure 8 , Figure 10 It is inclined relative to the horizontal plane as shown. Alternatively, the opening surface of the opening 603 can also be a horizontal plane.

[0132] The first inlet 60 may include a limiting part 602 that separates the inlet channel 601 and the first storage chamber 62. The limiting part 602 functions as a partition plate separating the inlet channel 601 and the first storage chamber 62. The limiting part 602 has the function of limiting a first liquid level 66, which is the liquid level in the first storage chamber 62, to a standard position SH.

[0133] like Figure 8 , Figure 10 As shown, the tank unit 26 includes a discharge section 74 and a second inlet section 75. The discharge section 74 is configured to communicate with the second storage chamber 68 and to direct the liquid in the second storage chamber 68 toward the liquid spray head 23 (see reference). Figure 2 Export. The export section 74 and the liquid ejector head 23 (see reference) Figure 2 One end of the connected supply channel 37 is connected.

[0134] The second inlet 75 is configured to communicate with the first storage chamber 62 and to introduce liquid recovered from the liquid nozzle 23. The second inlet 75 is connected to one end of the recovery channel 39, which communicates with the liquid nozzle 23.

[0135] like Figure 8 As shown, tank unit 26 has a first connection portion 76 that connects to the atmospheric open passage 50. Atmospheric open passage 50 (see reference) Figure 2For example, it is made of a pipe, and one end of the pipe is connected to the first connection portion 76. The first connection portion 76 is, for example, made of a pipe section that can be connected to a pipe or other conduit. The tank unit 26 has an air passage 78 that communicates with the first connection portion 76. The air passage 78 is via... Figure 10 The first atmospheric opening 64 shown communicates with the first storage chamber 62. Specifically, the first storage section 33 has... Figure 10 The atmospheric opening 33a is shown. The first storage chamber 62 is connected to the atmosphere via the atmospheric opening 33a and the first atmospheric opening portion 64. Figure 8 The airflow channel 78 shown is connected.

[0136] The first storage chamber 62 within tank unit 26 is connected to the atmospheric opening passage 50 (see reference) via the first atmospheric opening 64, the air flow channel 78, and the first connection 76. Figure 2 Therefore, the first gas phase portion 62G within the first storage chamber 62 is open to the atmosphere. As described above, when the first atmosphere opening portion 64 has a structure including a gas-liquid separation membrane, it is possible to open the first storage chamber 62 to the atmosphere while preventing the liquid in the first storage chamber 62 from leaking to the outside.

[0137] like Figure 8 As shown, the tank unit 26 includes a second connection portion 77 that communicates with the second storage chamber 68. The second connection portion 77 communicates with the second atmospheric opening portion 69. The second connection portion 77 is connected to a pressurized flow channel 51. The pressurized flow channel 51 is, for example, a pipe, and one end of the pipe is connected to the second connection portion 77. The second connection portion 77 communicates with the second air flow channel 79.

[0138] The second airflow channel 79 communicates with the second storage chamber 68 via the second atmospheric opening 69. The second storage chamber 68 is connected to the pressurized flow channel 51 (see reference) via the second atmospheric opening 69, the second airflow channel 79, and the second connecting portion 77. Figure 2 The second storage chamber 68 is pressurized by introducing pressurized air from the pressurization unit 47 through the pressurization channel 51, the second connection part 77, the second air channel 79, and the second atmospheric opening part 69. Specifically, the second storage unit 35 has... Figure 10 The atmospheric opening 35a is shown. The second storage chamber 68 is connected to the second atmospheric opening 69 via the atmospheric opening 35a and the second atmospheric opening section 69. Figure 8 The airflow channel 79 shown is connected.

[0139] When it is cleaning time, the control unit 19 introduces pressurized air into the second storage chamber 68 by driving the pressurization unit 47, thereby pressurizing the liquid in the second storage chamber 68. As a result, the liquid is forcibly discharged from the nozzle 22 of the liquid nozzle 23. In this way, the liquid nozzle 23 is cleaned. Through cleaning, clogging of the nozzle 22 of the liquid nozzle 23 can be prevented or eliminated.

[0140] When the second atmospheric opening 69 has a structure including a gas-liquid separation membrane, pressurized air can be introduced into the second storage chamber 68 while preventing leakage of liquid from the second storage chamber 68 to the outside. Alternatively, pressurized air can be introduced into the first storage chamber 62 from the pressurization section 47 through the atmospheric opening passage 50.

[0141] like Figure 10 As shown, the opening 603 can be located in the vertical direction Z at a position lower than the center HL within the first storage chamber 62. Figure 10 In this design, the area where the first storage chamber 62 is located in the vertical direction Z (Z-axis) is designated as the storage chamber region TA. The first inlet portion 60 connects to the first storage chamber 62 at a midpoint height in the vertical direction Z within the storage chamber region TA. An opening 603 is provided at the lower end of the inlet channel 601 of the first inlet portion 60. The first inlet portion 60 connects to the first storage chamber 62 via the opening 603 at a midpoint height in the vertical direction Z within the storage chamber region TA. A limiting portion 602, which is part of the component forming the inlet channel 601, functions as a partition between the inlet channel 601 and the first storage chamber 62.

[0142] The lower end 604 of the limiting section 602 defines the height of the first liquid level 66 at a standard position SH. In other words, the height of the lower end 604 of the limiting section 602 is set such that the first liquid level 66 is at the standard position SH. When liquid is injected from the liquid reservoir 24, the supply of liquid from the liquid reservoir 24 through the first inlet section 60 stops when the first liquid level 66 rises and reaches the lower end 604 of the limiting section 602.

[0143] The first storage chamber 62 is divided into a first liquid phase section 62L, which is a liquid phase section containing liquid, and a first gas phase section 62G, which is a gas phase section containing air, with the first liquid surface 66 as the boundary. In other words, the first storage chamber 62 is divided into a first liquid phase section 62L, which is the area below the first liquid surface 66, and a first gas phase section 62G, which is the area above the first liquid surface 66.

[0144] The second storage chamber 68 is divided by the second liquid level 70 into a second liquid phase section 68L, which is a liquid phase containing liquid, and a second gas phase section 68G, which is a gas phase containing air. In other words, the second storage chamber 68 is divided into a second liquid phase section 68L, which is the area below the second liquid level 70, and a second gas phase section 68G, which is the area above the second liquid level 70. Furthermore, in the area including the inlet channel 601, an inlet gas phase section 60G, which is a gas phase containing air, is defined above a liquid level 67 that is approximately the same height as the first liquid level 66.

[0145] like Figure 8 , Figure 10 As shown, the liquid level detection unit 63 includes a first detection unit 63a, a second detection unit 63b, and a third detection unit 63c. Figure 10 The first detection unit 63a, as shown, detects the first liquid level 66 when it is at the standard position SH. The control unit 19 determines that the first liquid level 66 is at the normal height when it is at the standard position SH. When the first liquid level 66 deviates from the standard position SH beyond the permissible range, causing the first detection unit 63a to become unable to detect it, the control unit 19 can adjust the first liquid level 66 to a height that the first detection unit 63a can detect. For example, the control unit 19 can adjust the first liquid level 66 to the standard position SH by controlling the pressure in the first storage chamber 62 through the pressurization unit 47 and the switching mechanism 48 and via the first atmospheric opening unit 64.

[0146] Figure 8 The second detection unit 63b shown measures the first liquid level 66 when the remaining amount of liquid in the first storage chamber 62 is less than the depletion threshold (see reference). Figure 10 The second detection unit 63b detects whether the remaining amount of liquid in the first storage chamber 62 has been depleted. When the remaining amount is depleted, the control unit 19 displays information such as prompting the replacement of the liquid container 24 on the display unit 15a.

[0147] Figure 8 The third detection unit 63c shown measures the first liquid level 66 when the cup is at a full position far exceeding the standard position SH (refer to...). Figure 10The third detection unit 63c detects the first liquid level 66 when the cup is full, thereby preventing leakage from the nozzle 22 of the liquid ejector head 23. Furthermore, the third detection unit 63c detects the first liquid level 66 when it is close to overflowing, thereby preventing liquid in the first storage chamber 62 from overflowing from the atmospheric opening 33a. The full cup position can be set to a liquid level height that, before overflowing, will not cause leakage from the nozzle 22 due to the water level difference between the nozzle 22 of the liquid ejector head 23 and the first liquid level 66.

[0148] like Figure 8 , Figure 10 As shown, the first storage chamber 62 and the second storage chamber 68 are arranged in a manner that at least partially overlaps in the vertical direction Z. Figure 8 , Figure 10 In the example shown, the first storage chamber 62 and the second storage chamber 68 are configured such that the portion of the upper part of the first storage chamber 62 extending horizontally and the portion of the lower part of the second storage chamber 68 extending horizontally overlap in the vertical direction Z.

[0149] The first storage chamber 62 is a storage chamber for detecting the remaining amount of the tank unit 26 by means of the liquid level detection section 63. Preferably, the liquid level height per unit volume of liquid in the first storage chamber 62 is relatively large when the remaining amount decreases, while reducing the deviation in the accuracy of the depletion detection when the remaining amount is exhausted. Therefore, the first storage chamber 62 is preferably a shape with a smaller lower volume compared to the upper volume. On the other hand, in order to be able to contain the liquid that is squeezed out due to temperature changes and thermal expansion of the gas phase in the liquid receiving body 24 in the first storage chamber 62, the first storage chamber 62 is preferably a large volume. Therefore, the first storage chamber 62 is preferably a shape with a smaller lower volume and a larger upper volume. Figure 8 , Figure 10 The shape shown. In Figure 8 , Figure 10 In the example shown, the first storage chamber 62 has a shape that extends horizontally from the lower part.

[0150] The second storage chamber 68 may also not need to detect the second liquid level 70, therefore, Figure 8 , Figure 10 As shown, a shape can be adopted in which the volume of the lower part is larger than the volume of the upper part. Figure 8 , Figure 10 In the example shown, the second storage chamber 68 has a shape in which the lower part extends horizontally compared to the upper part.

[0151] Moreover, such as Figure 8 , Figure 10As shown, the first storage section 33 and the second storage section 35 are arranged such that the portion of the upper part of the first storage section 33 extending horizontally and the portion of the lower part of the second storage section 35 extending horizontally overlap in the vertical direction Z. Therefore, the first storage chamber 62 and the second storage chamber 68 can be efficiently arranged in a generally rectangular storage space.

[0152] like Figure 10 As shown, the tank unit 26 may also include a filter 100, which is disposed between the second storage chamber 68 and the outlet 74, and is capable of capturing foreign matter contained in the liquid. Here, foreign matter includes air bubbles and fine dust particles contained in the liquid. Alternatively, the filter 100 may also be disposed between the first storage chamber 62 and the second inlet 75. In this case, the filter 100 may be a single shared filter or may be disposed independently.

[0153] like Figure 9 As shown, the first storage chamber 62 may also have a cover 88 inside. The cover 88 may also be located vertically above the second inlet 75, which opens on the lower surface of the first storage chamber 62. For example... Figure 9 As shown, a second inlet 75 is opened on the lower surface (inner bottom surface) of the first storage chamber 62, forming a communication port 75a that connects the second inlet 75 to the first storage chamber 62. A cover 88 is provided vertically above the communication port 75a. The cover 88 has an eave-shaped shape that covers the communication port 75a. When the returning liquid is introduced through the second inlet 75, there is a possibility that the liquid may violently gush out of the communication port 75a into the first storage chamber 62. Even in such a case, the force of the gushing liquid can be suppressed by allowing it to hit the cover 88. Therefore, it is possible to prevent the liquid flowing in from the communication port 75a from gushing out to the vicinity of the atmospheric opening 33a.

[0154] like Figure 10 As shown, the on / off valve 36 includes a one-way valve. This one-way valve allows the flow of liquid from the first storage chamber 62 towards the second storage chamber 68, and restricts the flow from the second storage chamber 68 towards the first storage chamber 62. Figure 10 In the example shown, multiple (e.g., two) of the on / off valve 36 are provided. The detailed structure of the one-way valve constituting the on / off valve 36 is described below.

[0155] like Figure 10As shown, the atmospheric opening 64 has a gas-liquid separation membrane. This membrane is, for example, a moisture-permeable membrane. The gas-liquid separation membrane allows air to pass through but not liquid. The moisture-permeable membrane is designed with waterproof properties in mind, simulating the case of water. When the liquid is ink, the moisture-permeable membrane has lower waterproof properties compared to when the liquid is water, thus making it easier for ink to penetrate. Therefore, a defoamer composed of a waterproofing agent or defoamer can be applied to the moisture-permeable membrane to make it difficult for ink to penetrate.

[0156] Liquid storage container 24

[0157] like Figure 10 As shown, the first storage chamber 62 requires a vapor phase section 62G. Since the liquid reservoir 24 is a closed space, when the internal air expands due to temperature changes, liquid may be squeezed out of the liquid reservoir 24 into the first storage chamber 62. Therefore, the vapor phase section 62G is configured to contain the maximum amount of liquid squeezed out of the liquid reservoir 24 even if the maximum possible amount of liquid is squeezed out due to the expansion of the air inside the liquid reservoir 24.

[0158] like Figure 1 As shown, the volume of the liquid reservoir 24 varies depending on the type of liquid (e.g., ink color). Regarding the liquid reservoir 24, the width of a liquid reservoir with black ink is wider than that of a liquid reservoir with colored ink. Similarly, the width of the first storage section 33 corresponding to black ink is also wider than that of the liquid reservoir 24. Figure 10 The vapor phase 62G of the first storage chamber 62 shown is larger for black than for color. If the liquid usage ratio (supply ratio) is the same, the vapor phase of the liquid reservoir 24 is larger for black than for color, and the amount of liquid (e.g., ink) squeezed out when the air in that vapor phase expands thermally is also greater for black. In this example, the vapor phase 62G of the first storage chamber 62 is larger for black than for color. Therefore, even if liquid is squeezed out of the liquid reservoir 24 due to thermal expansion of the air inside the liquid reservoir 24 caused by temperature changes, the squeezed-out liquid can be contained in the first storage chamber 62 without overflow.

[0159] like Figure 10 As shown, the first inlet portion 60 is tilted at a predetermined angle. This predetermined angle is, for example, a predetermined value within the range of 1 to 15 degrees. Therefore, the liquid reservoir 24 is installed in a manner that is tilted at a predetermined angle relative to the vertical direction Z, similar to the angle of the first inlet portion 60. By installing the liquid reservoir 24 in this tilted, predetermined-angled position, the remaining amount of liquid in the reservoir 24 can be approximately used up completely.

[0160] Tilting detection of tank unit 26

[0161] like Figure 12 As shown, the tank unit 26 also includes a tilt detection unit 98. This tilt detection unit 98 detects the tilt of the tank unit 26 itself. That is, the tilt detection unit 98 is supported in a fixed state relative to the frame 89 that supports the tank unit 26. The tilt detection unit 98 outputs a detection signal indicating the tilt of the tank unit 26 to the control unit 19.

[0162] The control unit 19 determines whether the tilt angle of the can unit 26 exceeds an angle threshold based on the detection signal from the tilt detection unit 98. If the tilt angle of the can unit 26 exceeds the angle threshold, the control unit 19 prohibits the printing operation (liquid ejection operation) performed by the liquid ejection device 11. Additionally, the control unit 19 displays a message on the display unit 15a prompting adjustment of the tilt of the liquid ejection device 11. One reason for excessive liquid flow from the liquid reservoir 24 into the first storage unit 33 is that the tilt of the can unit 26 exceeds the permissible tilt. Therefore, when the tilt angle of the can unit 26 detected by the tilt detection unit 98 exceeds a predetermined angle threshold, the control unit 19 may display a message prompting the user to adjust the tilt of the liquid ejection device 11. Furthermore, when the tilt angle of the can unit 26 detected by the tilt detection unit 98 exceeds a predetermined angle threshold, the control unit 19 may set the liquid ejection device 11 to a state where printing cannot begin until the excessive tilt is eliminated. In this situation, the user adjusts the tilt of the liquid ejection device 11. When the detection angle of the tilt detection unit 98 becomes below the angle threshold, the control unit 19 starts to execute the printing action of the liquid ejection device 11 based on the printing instruction from the user.

[0163] like Figure 11 , Figure 12 As shown, in the tank unit 26, multiple sets of first inlet portions 60 and positioning protrusions 248 are arranged side by side along the X-axis. Adjacent to the multiple first inlet portions 60 on the side opposite to the positioning protrusions 248 in the Y-axis direction, multiple liquid level detection portions 63 are arranged side by side along the X-axis. Each liquid level detection portion 63 has its own terminal portion 63d protruding from the upper surface of the mounting portion 28. The terminal portion 63d is electrically connected to the control unit 19 via a signal line (not shown).

[0164] The tank unit 26 includes absorbent members 93 and 94 disposed below the first storage section 33. The absorbent members 93 and 94 are designed to absorb liquids such as ink that leak during the assembly and disassembly of the liquid container 24. The absorbent members 93 and 94 are configured to absorb liquids that splash or drip from the first inlet section 60. Here, when the liquid container 24 is removed from the mounting section 28, liquids splashed from the first inlet section 60 and liquids dripping along the side of the first inlet section 60 are guided towards the first absorbent member 93.

[0165] The first absorbent member 93 is supported on the frame 89 at a position directly below the first inlet portion 60, standing vertically in the vertical direction Z. The second absorbent member 94 is horizontally placed on the frame 89 with a portion of it in contact with the base end of the first absorbent member 93. Figure 11 As shown, the two absorption components 93 and 94 are approximately L-shaped when viewed from the side. The second absorption component 94 is configured to span approximately the entire area directly below the first storage section 33 and the second storage chamber 68. Therefore, liquids that accidentally leak from the first storage section 33 and the second storage chamber 68, as well as liquids dripping along their outer walls, will be absorbed by the second absorption component 94.

[0166] Liquid leakage suppression structure from the first inlet 60

[0167] Next, refer to Figure 13 , Figure 14 A liquid leakage suppression structure will be described that suppresses leakage of liquid from the inlet 60a of the first inlet 60 and can recover the leaked liquid even if leakage occurs. The tank unit 26 has a liquid leakage suppression structure near and below the first inlet 60.

[0168] like Figure 13 As shown, the liquid leakage suppression structure consists of a liquid splash prevention wall 605 provided on the first inlet 60 and a liquid recovery structure including a guide groove 606 that can recover splashed liquid even if splashing occurs.

[0169] First, refer to Figure 6 , Figure 7 as well as Figure 14The phenomenon of liquid splashing from the inlet 60a when the liquid reservoir 24 is removed will be explained. In the space 60s, which is part of the flow channel within the first inlet 60, a portion of the liquid introduced into the first inlet 60 from the outlet 30 remains. During the removal of the liquid reservoir 24 from the mounting portion 28, the space 60s within the first inlet 60 becomes negative pressure due to volume expansion. Specifically, the valve body 61a rises towards the inlet 60a while the inlet 60a is blocked by the protrusion 31c. The inlet valve 61 closes due to this rise of the valve body 61a. Even with the inlet valve 61 closed, the inlet 60a still flows through the protrusion 31c (see reference 31c). Figure 7 Therefore, the space 60s within the first inlet 60 (refer to...) is blocked. Figure 14 This temporarily creates a closed space. After the closed space 60s is formed, as the protrusion 31c further moves upward until it is pulled out from the inlet 60a, the closed space 60s depressurizes due to the expansion of the internal air, becoming a negative pressure. This negative pressure acts as a force to draw the residual liquid in the space 60s towards the inlet 60a. Therefore, when the liquid reservoir 24 is removed from the mounting part 28, there is a possibility that liquid may splash from the inlet 60a.

[0170] The first inlet portion 60 has a liquid splash prevention wall 605 installed at its top end on the inlet port 60a side, in a state where only the inlet port 60a is left open while the surrounding area is covered. The liquid splash prevention wall 605 has an annular wall portion that covers the periphery of the inlet port 60a.

[0171] like Figure 13 As shown, a liquid splash prevention wall 605 is installed at the top of the first inlet 60 in such a way that it leaves the inlet 60a open and covers its surroundings. This liquid splash prevention wall 605 can greatly suppress liquid splashing from the inlet 60a. However, it cannot completely prevent liquid splashing from the inlet 60a.

[0172] Therefore, tank unit 26 has a liquid recovery structure that recovers liquid splashed from inlet 60a. The liquid recovery structure includes... Figure 13 The annular guide groove 606 and guide recess 96 shown are illustrated. Figure 14 The guide hole 96a, guide portion 97, and first absorption component 93 are shown.

[0173] The liquid recovery structure has a guide groove 606 in the area capable of collecting liquid that splashes from the inlet 60a and falls into its surroundings. The first inlet 60 has a tubular protrusion 607 with an inlet 60a opening at its top. The guide groove 606 is formed in an annular groove path on the upper surface of the frustum-shaped portion disposed on the base of the protrusion 607.

[0174] exist Figure 14 As shown in the side view taken along the X-axis, the forming surface of the guide groove 606 is inclined at a predetermined angle relative to the horizontal plane. This predetermined angle is, for example, approximately equal to the angle at which the axis CL of the first inlet 60 is inclined relative to the vertical direction Z. The annular guide groove 606 guides the liquid in a lower direction.

[0175] like Figure 14 As shown, a concave guide recess 96 is formed between the first inlet portion 60 and the positioning protrusion 248 to guide liquid downwards along the side of the guide groove 606 from the lower end of the groove. Figure 13 As shown, the guide recess 96 is formed by a space separated by three side-by-side wall plate portions 96b spaced apart along the X-axis between the first inlet portion 60 and the positioning protrusion 248. The guide groove 606 opens towards the guide recess 96 at its lower end in a manner that allows liquid to be guided towards the guide recess 96. Liquid splashed out from the inlet 60a and guided along the annular guide groove 606 is guided towards the guide recess 96. Figure 14 As shown, liquid guided towards the lower side along the annular guide groove 606 is guided downward through the guide recess 96.

[0176] like Figure 14 As shown, a guide hole 96a is opened at the bottom of the guide recess 96. Liquid passing through the guide hole 96a flows down or drips along the side wall. A first absorbent member 93 is disposed near the lower end of the guide path of the liquid flowing down or dripping along the side wall. Near the lower end of the liquid guide path, a guide portion 97 is disposed at an angle, recessed into the upper part of the first absorbent member 93. Liquid guided downward along the liquid guide path is guided by the guide portion 97 to the first absorbent member 93 and absorbed by the first absorbent member 93. The first absorbent member 93 is located on the inner side surrounded by the frame 89. Therefore, the liquid absorbed by the first absorbent member 93 will not leak outside the frame 89.

[0177] Structure of on / off valve 36

[0178] Next, refer to Figures 15 to 18The structure of the on / off valve 36 will be described below. The on / off valve 36 is a differential pressure valve that is opened and closed based on the water level difference between the first liquid level 66 in the first storage chamber 62 and the second liquid level 70 in the second storage chamber 68. The on / off valve 36 includes a valve body 101.

[0179] For example, umbrella valves, which are umbrella-shaped valve bodies, have traditionally been used as the valve body for a differential pressure valve that opens and closes based on this water level difference. However, umbrella valves have the potential to cause minor liquid leakage due to difficulty in ensuring the required sealing pressure on the valve seat. This minor leakage can cause deviations in the height of the second liquid level 70. This means that deviations in the water level difference can affect the size of the droplets ejected from the liquid nozzle 23, and even the printing quality. Therefore, it is desirable to suppress this minor leakage to a very small amount or to suppress it to zero. Therefore, in this embodiment, the valve body of the opening and closing valve 36 adopts an umbrella-shaped valve body. Figure 16 , Figure 17 The valve body 101 has the shape shown. Additionally, via... Figure 17 The membrane F3 shown forms one surface (bottom surface) of the outlet channel 34.

[0180] like Figure 16 , Figure 17 As shown, the valve body 101 includes a shaft portion 102 and a valve portion 103. The shaft portion 102 has an anti-disengagement portion 104 that bulges radially relative to other portions at its midpoint in the axial direction. Furthermore, the shaft portion 102 extends substantially vertically from the center of the circular valve portion 103.

[0181] The valve portion 103 includes: a valve plate portion 103a, which is circular in shape and ensures a predetermined thickness to improve rigidity; a lip portion 105, which is formed by an annular linear seal protruding from the side of the shaft portion 102 in the valve plate portion 103a; and a fin portion 106, which is annular and extends radially outward from the periphery of the valve plate portion 103a. The fin portion 106 has a thinner wall thickness and higher flexibility than the valve plate portion 103a. The fin portion 106 may also be configured such that its wall thickness becomes thinner towards the outer edge.

[0182] like Figure 17 As shown, a plurality of valve holes 332 are formed on the partition wall 331 between the first storage chamber 62 and the outlet channel 34, on the portion for assembling the valve body 101. The plurality of valve holes 332 connect the first storage chamber 62 and the outlet channel 34. The side of the partition wall 331 on which the plurality of valve holes 332 are formed, opposite to the outlet channel 34, is formed as a concave surface, and the bottom surface of the concave surface becomes a valve seat 333. Figure 17In this configuration, the valve body 101 is in the open state, with its valve portion 103 separated from the valve seat 333. The valve body 101 moves axially and opens / closes the valve orifice 332 based on the pressure difference between the hydraulic pressure determined by the height of the first liquid level 66 in the first storage chamber 62 and the hydraulic pressure determined by the height of the second liquid level 70 in the second storage chamber 68, the weight of the valve body 101, and the buoyancy acting on the valve body 101 in the liquid. That is, as... Figure 17 As shown, the valve body 101 moves between an open position where the valve portion 103 separates from the valve seat 333, and a closed position where the valve portion 103 abuts against the valve seat 333 with a predetermined applied pressure. Furthermore, Figure 17 The valve body 101 shown is an example of the open valve position. The lip 105 and fin 106 of the valve part 103 are in the open valve position whenever they leave the valve seat 333 and have liquid flow through the valve hole 332.

[0183] Existing umbrella valves often feature a fin-shaped valve section where the wall thickness gradually decreases towards the radial outer periphery. Consequently, the more flexible portion of the valve section has a larger area. This high flexibility allows the umbrella valve section to bend easily, resulting in relatively low pressure on the valve seat when the section comes into contact with it. This is why umbrella valves are prone to minor leaks in the closed position.

[0184] In contrast, in the valve body 101 of this embodiment, in addition to the valve plate portion 103a being a circular plate with a substantially fixed thickness, thus possessing high rigidity, a lip 105 formed by a protruding annular line seal is provided on the surface of the valve plate portion 103a opposite to the valve seat 333. Furthermore, the valve portion 103 has an annular fin 106 extending radially outward from the periphery of the valve plate portion 103a. Thus, the valve body 101 has an annular lip 105 and an annular fin 106 surrounding the lip 105 on its outer periphery. When the on / off valve 36 is closed, it is pressed against the valve seat 333 by the lip 105 and sealed by the line seal, while the fin 106 is pressed against the surface of the valve seat 333 in a slightly flexed state on the outer periphery of the line seal. Therefore, the required pressure can be obtained when the on / off valve 36 is closed and the valve body 101 abuts against the valve seat 333.

[0185] In addition, such as Figure 17 As shown, because the on / off valve 36 has multiple valve holes 332 with relatively small flow channel cross-sectional areas, the pressure loss is relatively large due to the relatively large flow resistance when the valve is opened. Therefore, in order to reduce the pressure loss, it is also possible to... Figure 17As shown in the example, two on / off valves 36 are arranged side by side. The total flow cross-sectional area of ​​the valve orifice 332 is increased by the two on / off valves 36, thereby minimizing pressure loss.

[0186] Furthermore, the on / off valve 36 is a differential pressure valve with a floating valve body 101 that opens and closes using the water level difference caused by the difference in liquid level height between the first storage chamber 62 and the second storage chamber 68. Here, the floating valve body 101 refers to a differential pressure valve that opens and closes by moving the floating valve body 101, which is in a floating state in the liquid, without using a force-applying component such as a spring to apply force to the valve body 101 in the closing direction, and instead using the differential pressure caused by the water level difference between the first storage chamber 62 and the second storage chamber 68. Thus, since the on / off valve 36 is a floating type that opens with a small water level difference, it will open immediately if there is a small difference in height between the first liquid level 66 and the second liquid level 70. Therefore, based on the ability to adjust the second liquid level 70 to the same height as the first liquid level 66, it is difficult for a height difference to occur between the first liquid level 66 and the second liquid level 70.

[0187] Figure 18 A graph comparing the pressure applied to the valve seat 333 during valve closure for both the existing umbrella valve body and the valve body 101 of this embodiment. In this graph, the horizontal axis represents the reservoir pressure (kPa) applied to the valve body from the liquid in the second reservoir chamber 68, and the vertical axis represents the sealing pressure (kPa) when the valve body abuts against the valve seat 333. Figure 18 In the figure, line L1, shown as a solid line, represents the sealing pressure of the valve body 101 relative to the reservoir in the embodiment. Line L2, shown as a dashed line in the same figure, represents the sealing pressure of the valve body constituting the conventional umbrella valve relative to the reservoir. Figure 18 As can be seen from the graph, the sealing pressure relative to the reservoir pressure is approximately twice that of the valve body 101 used in this embodiment, compared to the case where a conventional umbrella valve is used. This means that by configuring the valve body 101 with a structure having a lip 105 composed of an annular linear seal and an annular fin 106, the sealing pressure is approximately twice as high. Furthermore, the reservoir pressure in the operating area of ​​the liquid ejection device 11 is, for example, approximately 5 to 70 kPa. For example, the reservoir pressure increases progressively in stages according to the sequence of printing, liquid circulation, and cleaning. Even during printing when the reservoir pressure is relatively low, the required sealing pressure can be reliably ensured. Additionally, the reservoir pressure in the operating area can be appropriately varied.

[0188] Reverse installation of liquid reservoir 24

[0189] Next, refer to Figures 19 to 23This section explains the problem of users installing the liquid container 24 incorrectly, and the structure of the mounting section 28 that solves this problem. Additionally, Figure 19 This indicates the situation in this embodiment when the user installs the liquid container 24 with the correct orientation. Figures 20 to 22 This document explains the issues that arise when the user incorrectly installs the liquid container 24, given the existing structure of the mounting section 28. Figure 23 The structure of the mounting section 28 in the embodiment is shown.

[0190] like Figure 19 As shown, when the liquid reservoir 24 is correctly oriented, it is inserted vertically and horizontally into the box-shaped frame 80 through the insertion port 28o. The liquid reservoir 24 is inserted vertically along the top plate 81 constituting the frame 80. During the insertion of the liquid reservoir 24, the guide portion 247 on the mounting portion 28 side engages with the receiving portion 447 on the liquid reservoir 24 side. Specifically, as the liquid reservoir 24 is inserted into the frame, firstly, the two guide portions 247a engage sequentially with the first receiving portion 447a, and further, in the final stage of installation, the guide portion 247b engages with the second receiving portion 447b. A stop 449 is provided on the liquid reservoir 24 and on the rear end face of the first receiving portion 447a to restrict further insertion of the liquid reservoir 24 into the frame 80.

[0191] Next, refer to Figures 20 to 23 This section explains the issue of users inserting the liquid container 24 incorrectly, front or back.

[0192] like Figure 20 As shown, conventionally, even if a user incorrectly inserts the liquid reservoir 24 into the frame 80 of the mounting section 28, the guide section 247a will encounter the stop 449, which is made of ribs, located at the rear end of the bearing section 447a. Therefore, it becomes a structure that prevents the liquid reservoir 24 from being inserted further with the reverse orientation.

[0193] However, there are instances where users forcibly push the liquid container 24 in. In such cases, when the user tilts the liquid container 24 while pushing it in, as... Figure 21As shown, the rear end of the liquid reservoir 24 passes over the upper side of the guide portion 247a, lifting the portion near the insertion port 28o of the top plate 81 upwards. In this case, because the upper surface of the rear end of the liquid reservoir 24 causes the top plate 81 to bend upwards near the insertion port 28o, and the liquid reservoir 24 is inserted from the insertion port 28o to the predetermined position, there is a possibility that the liquid reservoir 24 may become impossible to remove. Moreover, when the liquid reservoir 24 is inserted deeper into the frame 80 until the guide portion 247a exceeds the stop 449, as... Figure 22 As shown, there is a situation where the guide portion 247a is stuck into the receiving portion 447a. In this case, since the guide portion 247a, which was once stuck into the receiving portion 447a, hits the stop 449, it becomes impossible to remove the liquid container 24 from the frame 80. Figure 22 The state shown is locked.

[0194] To avoid such a locked state, such as Figure 19 as well as Figure 23 As shown, the mounting portion 28 of the embodiment has a protrusion 110 on its lower surface near the insertion port 28o of the top plate 81 constituting the frame 80. The protrusion 110 extends downwards (vertically in the Z direction) from the lower surface of the top plate 81, so that even if the rear end of the liquid reservoir 24 is forcibly inserted through the insertion port 28o, causing the top plate 81 to bend, the upper surface of the rear end of the liquid reservoir 24 will encounter the protrusion 110, preventing further insertion into the frame 80. Therefore, the liquid reservoir 24 can be prevented from becoming locked.

[0195] The role of the implementation method

[0196] Next, the function of this embodiment will be explained.

[0197] The user installs the liquid reservoir 24 onto the mounting portion 28 of the tank unit 26. This connects the outflow portion 30 of the liquid reservoir 24 to the first inlet portion 60 of the tank unit 26. This installation of the liquid reservoir 24 is performed, for example, when the liquid in the previous liquid reservoir 24 is depleted and needs to be replaced. For example, this may occur when the liquid in the tank unit 26 is detected to be depleted, or when the first liquid level 66 in the first storage chamber 62 remains below the standard position SH for an extended period. In such cases, the control unit 19 causes the display unit 15a to display a message prompting the replacement of the liquid reservoir 24. The user, upon seeing this message, replaces the liquid reservoir 24.

[0198] The first inlet section 60 communicates with the first storage chamber 62 via an opening 603 located at a midpoint height in the vertical direction Z. When the first gas phase section 62G and the inlet gas phase section 60G communicate via the opening 603, liquid is supplied from the liquid reservoir 24 to the first storage chamber 62. Furthermore, when the first liquid level 66 in the first storage chamber 62 reaches a standard position SH (refer to the midpoint height in the vertical direction Z of the first storage chamber 62), liquid is supplied to the first storage chamber 62. Figure 10 When the first liquid level 66 reaches the lower end 604 of the limiting section 602, the first gas phase section 62G and the inlet gas phase section 60G become disconnected. In other words, the flow path of air from the first gas phase section 62G to the inlet gas phase section 60G is blocked. As a result, the supply of liquid from the liquid receiver 24 to the first storage chamber 62 stops.

[0199] Furthermore, when liquid is supplied from the second storage chamber 68 to the liquid nozzle 23 and the second liquid level 70 becomes lower than the first liquid level 66, the valve 36 is opened using the water level difference between the first storage chamber 62 and the second storage chamber 68. As a result, liquid flows from the first storage chamber 62 to the second storage chamber 68 through the outlet channel 34. Thus, when the first liquid level 66 is lower than the standard position SH, the first gas phase section 62G and the inlet gas phase section 60G reconnect to form an air channel, and liquid is supplied from the liquid receiver 24 to the first storage chamber 62.

[0200] When liquid is supplied from the liquid reservoir 24 to the first storage chamber 62 and the first liquid level rises, the first liquid level 66 becomes higher than the second liquid level 70. Furthermore, for liquid circulation, printing (liquid ejection processing), or cleaning, when liquid in the second storage chamber 68 is supplied to the liquid ejector head 23, the second liquid level 70 drops and becomes lower than the first liquid level 66.

[0201] In these situations, the on / off valve 36 is opened, thereby adjusting the heights of the first liquid level 66 and the second liquid level 70 to become equal. When the water level difference disappears, the on / off valve 36 closes. Thus, the first liquid level 66 and the second liquid level 70 are adjusted to approximately the same height, i.e., the standard position SH (refer to...). Figure 2 , Figure 10 ).

[0202] Thus, the first liquid level 66 in the first storage chamber 62 is autonomously adjusted to a position where the first inlet 60 connects to the first storage chamber 62 at the opening 603 at the lower end of its inlet channel 601, and at a standard position SH that is the midpoint of the vertical Z direction of the first storage chamber 62. In other words, the first liquid level 66 is autonomously adjusted to a standard position SH that is the height of the lower end 604 of the partition between the inlet channel 601 and the first storage chamber 62, namely the limiting part 602.

[0203] At this time, as Figure 16 , Figure 17 As shown, the valve body 101 of the on / off valve 36 has an annular lip 105 and an annular fin 106 disposed on a thick-walled valve plate portion 103a. Therefore, compared to a known umbrella valve, the valve body 101 of the on / off valve 36 can achieve approximately twice the sealing pressure (see reference) if the reservoir pressure in the second storage chamber 68 is the same. Figure 18 Therefore, it is able to suppress minor leaks at the on / off valve 36.

[0204] For example, due to tilting of the liquid dispensing device 11 or other reasons, when the first liquid level 66 exceeds the full cup position, leakage may occur from the nozzle 22 of the liquid dispensing head 23 due to the water level difference. However, in this embodiment, when the full cup position is detected by the liquid level detection unit 63, or when the tilt of the can unit 26 exceeds the angle threshold is detected by the tilt detection unit 98, the control unit 19 prohibits the start of printing by the liquid dispensing device 11. Then, the control unit 19 displays a message on the display unit 15a prompting the elimination of the tilt of the liquid dispensing device 11. The user eliminates the tilt of the liquid dispensing device 11. Then, when the detection result of the tilt detection unit 98 is less than the angle threshold, the control unit 19 starts printing.

[0205] When the liquid dispensing device 11 is in a standby state without printing, the liquid is circulated. The liquid circulates through the second storage chamber 68 of the tank unit 26, the supply channel 37, the liquid nozzle 23, and the return channel 39, returning to the first storage chamber 62 of the tank unit 26. At this time, the supply valve 38 and the circulation valve 40 are open. Furthermore, with the first storage chamber 62 open to the atmosphere via the atmospheric opening 64, the second storage chamber 68 is pressurized.

[0206] like Figure 10 As shown, in tank unit 26, water flows from the second storage chamber 68 through the outlet 74 and the supply channel 37 to... Figure 10 The liquid supplied in the direction of discharge, indicated by the solid-line arrow, passes through the liquid nozzle 23 (see reference). Figure 2After passing through the liquid outlet 23, it flows through the recovery channel 39 and returns from the second inlet 75 to the first storage chamber 62. At this time, the pressure in the second storage chamber 68 is higher than the pressure in the first storage chamber 62. Therefore, the on / off valve 36 closes. That is, the liquid dispensing device 11 closes the outlet channel 34 by pressurizing the second storage chamber 68 and thereby closing the on / off valve 36.

[0207] During this liquid circulation, liquid returning from the liquid nozzle 23 to the first storage chamber 62 of the tank unit 26 flows into the first storage chamber 62 through the connecting port 75a. At this time, there is a possibility that liquid may overflow from the connecting port 75a into the first storage chamber 62. However, in this embodiment, an eave-shaped cover 88 is provided in the first storage chamber 62 at a position opposite to the connecting port 75a. Therefore, the liquid that violently overflows from the connecting port 75a will hit the cover 88, thereby suppressing its momentum. As a result, it is possible to prevent the liquid overflowing from the connecting port 75a from reaching areas where liquid should not flow in, such as the atmospheric vent 33a.

[0208] Furthermore, the circulating liquid passes through the filter 100 as it is supplied from the second storage chamber 68 toward the liquid nozzle 23. Foreign matter in the circulating liquid, including air bubbles and tiny dust particles, is captured by the filter 100. Therefore, during printing by the liquid ejection device 11, liquid with foreign matter such as air bubbles removed is supplied to the liquid nozzle 23.

[0209] During printing, at least one of the supply valve 38 and the circulation valve 40 is opened. The number of valves in the supply valve 38 and the circulation valve 40 that are opened can also be determined based on the amount of liquid ejected from the nozzle 22 of the liquid ejection head 23. The control unit 19 can also, for example, open only the supply valve 38 if the ejection volume is below a predetermined value based on printing data. The control unit 19 can also, for example, open both the supply valve 38 and the circulation valve 40 if the ejection volume exceeds a predetermined value based on printing data.

[0210] Furthermore, during this printing process, by opening the sixth selection valve 73f and the tenth selection valve 73j through the switching mechanism 48, the first storage chamber 62 is connected to the atmosphere through the atmospheric opening passage 50 and the connecting flow channel 52. Furthermore, by opening the seventh selection valve 73g and the eleventh selection valve 73k through the switching mechanism 48, the second storage chamber 68 is connected to the atmosphere through the pressurized flow channel 51 and the connecting flow channel 52.

[0211] During printing, a negative pressure is applied to the liquid in the liquid ejector head 23 based on the water level difference between the second liquid level 70 in the second storage chamber 68 and the nozzle 22, and the water level difference between the first liquid level 66 in the first storage chamber 62 and the nozzle 22. During printing, the liquid in the second storage chamber 68 is supplied to the liquid ejector head 23 through the supply channel 37, and the liquid in the first storage chamber 62 is directed towards… Figure 10 The outlet direction, indicated by the dashed arrow, is supplied to the liquid nozzle 23 through the recovery channel 39.

[0212] Furthermore, the liquid dispensing device 11 performs pressurized cleaning of the liquid nozzle 23 periodically or irregularly. Pressurized cleaning involves pressurizing the liquid within the second storage chamber 68, thereby pressurizing the liquid within the liquid nozzle 23 and forcibly discharging the liquid from the nozzle 22. At this time, with the supply valve 38 open and the circulation valve 40 closed, the second storage chamber 68 is pressurized. Air passing through the connecting flow channel 52 and the pressurized flow channel 51 is introduced into the second storage chamber 68 via the atmospheric opening 69, driven forward by the pressurizing unit 47. As a result, the second storage chamber 68 is pressurized.

[0213] With the circulation valve 40 closed, the liquid in the second storage chamber 68 is pressurized, thereby pressurizing the liquid in the liquid nozzle 23. This performs pressurized cleaning, forcibly discharging liquid from the nozzle 22 of the liquid nozzle 23. At this time, the opening / closing valve 36 closes due to the increased pressure in the second storage chamber 68. The liquid discharged from the nozzle 22 through this pressurized cleaning is discharged into a cap or rinsing tank (not shown). The liquid is then recovered from the cap or rinsing tank to a waste liquid recovery unit (not shown).

[0214] Effects of the implementation method

[0215] The effects of this implementation method will be explained.

[0216] (1) The tank unit 26 is configured to introduce liquid supplied from the liquid reservoir 24 and to discharge the liquid toward the spray nozzle 23. The tank unit 26 includes: a first inlet 60 for introducing liquid supplied from the liquid reservoir 24; a first storage chamber 62 for storing the liquid introduced from the first inlet 60; and a first vent 64 for opening the first storage chamber 62 to the atmosphere. Furthermore, the tank unit 26 includes: a discharge channel 34, one end of which is connected to the first storage chamber 62 and discharges the liquid within the first storage chamber 62; a second storage chamber 68, the other end of which is connected to the discharge channel 34 and stores the liquid supplied from the first storage chamber 62; and a second vent 69 for opening the second storage chamber 68 to the atmosphere. Additionally, the tank unit 26 includes an on / off valve 36 for opening and closing the discharge channel 34. The first inlet 60 is connected to the first storage chamber 62 via an opening 603 at a midpoint in the vertical direction Z. With this structure, the liquid levels in the two storage chambers 62 and 68 can be set to an appropriate height without implementing supply control or similar procedures.

[0217] (2) In the tank unit 26, the opening 603 is located in the vertical direction Z at a position lower than the center of the first storage chamber 62. According to this structure, when liquid moves between the first storage chamber 62, the second storage chamber 68, and the liquid container 24 due to environmental changes, etc., it is possible to suppress the overflow of liquid from the storage chambers, etc.

[0218] (3) The tank unit 26 also includes a liquid level detection unit 63, which can detect the liquid level in the first storage chamber 62. According to this structure, it is possible to detect when the liquid in the liquid container 24 decreases and to prevent the liquid in the first storage chamber 62 from overflowing.

[0219] (4) In tank unit 26, the on / off valve 36 includes a one-way valve that allows the flow of liquid from the first storage chamber 62 toward the second storage chamber 68 and restricts the flow from the second storage chamber 68 toward the first storage chamber 62. According to this configuration, no valve drive source is required.

[0220] (5) In tank unit 26, the first storage chamber 62 and the second storage chamber 68 are arranged in such a way that they at least partially overlap in the vertical direction Z. According to this structure, an efficient layout of the first storage chamber 62 and the second storage chamber 68 can be achieved.

[0221] (6) The tank unit 26 further includes: a discharge section 74, which communicates with the second storage chamber 68 and is capable of discharging liquid in the second storage chamber 68 toward the liquid nozzle 23; and a second inlet section 75, which communicates with the first storage chamber 62 and is capable of introducing liquid recovered from the liquid nozzle 23. According to this structure, the liquid level in the first storage chamber 62 and the liquid level in the second storage chamber 68 can be maintained at the same liquid level.

[0222] (7) The tank unit 26 also includes a filter 100, which is disposed between the second storage chamber 68 and the outlet 74 and is capable of capturing foreign matter contained in the liquid. According to this structure, it is possible to capture foreign matter mixed in due to the replacement of the liquid container 24, foreign matter that appears due to circulation, etc.

[0223] (8) In the tank unit 26, the first storage chamber 62 has a cover 88 inside, which is disposed vertically above the second inlet 75 that opens on the lower surface inside the first storage chamber 62. According to this structure, it is possible to suppress the splashing of ink recovered into the first storage chamber 62 into the entire first storage chamber 62.

[0224] (9) The liquid ejection device 11 includes: a liquid ejection head 23 capable of ejecting liquid; a tank unit 26; a supply channel 37 connecting the outlet 74 and the liquid ejection head 23; and a recovery channel 39 connecting the liquid ejection head 23 and the second inlet 75. According to this structure, the liquid ejection device 11 can achieve the same effect as the tank unit 26.

[0225] (10) The liquid ejection device 11 also includes a tilt detection unit 98, which detects the tilt of the tank unit 26. With this structure, the amount of change in the liquid level caused by tilting can be suppressed to a small extent, thereby reducing the liquid level detection deviation.

[0226] (11) The liquid ejection device 11 also includes a pressurization section 47, which is connected to the second atmospheric opening section 69 and can pressurize the second storage chamber 68. According to this structure, pressurized cleaning can be performed.

[0227] This embodiment can be modified and implemented in the following ways. This embodiment and the following modifications can be combined and implemented with each other within the scope of technical inconsistency.

[0228] Alternatively, the first inlet 60 may be configured to have a pipe or hose, tube or other conduit that extends within the first storage chamber 62 in a manner having a vertical Z-direction component.

[0229] • The opening surface of the opening 603 can also be a horizontal surface. Furthermore, the opening surface of the opening 603 can also face... Figure 10The tilt shown is directed towards the opposite side. Furthermore, the angle between the opening surface of the opening 603 and the horizontal plane can be arbitrarily changed. It only needs to face downwards. That is, the normal to the opening surface of the opening 603 only needs to face the vertical direction Z, or a direction between the vertical direction Z and the horizontal direction.

[0230] • The first inlet section 60 may also be a structure that extends in the vertical direction Z without tilting.

[0231] The inlet channel 601 of the first inlet 60 can also be a curved flow channel. The first inlet 60 only needs to be connected via the opening 603 at a midpoint in the vertical direction Z of the first storage chamber 62. If this structure is established, the shape of the flow channel from the inlet port 60a of the first inlet 60 to the inlet channel 601 of the opening 603 can be any shape. That is, the lower end of the limiting part 602, which serves as the partition between the first storage chamber 62 and the inlet channel 601, only needs to be at a midpoint in the vertical direction Z of the first storage chamber 62. Alternatively, the opening surface of the opening 603, when viewed from the Y-axis direction, can be inclined relative to the horizontal plane. In this case, the height of the first liquid level 66 is defined by the portion of the opening surface of the opening 603 that is at its highest point when viewed from the Y-axis direction.

[0232] • The on / off valve 36 can also be controlled by the control unit 19. The on / off valve 36 can also be, for example, a solenoid valve. In addition, the on / off valve 36 can also be a flow regulating valve that can regulate the flow rate when the valve is open.

[0233] The pressurization section 47 is not limited to a tubular pump; it can also be other types of pumps, such as a diaphragm pump or a gear pump.

[0234] • The tank unit 26 is not limited to being disposed within the main body of the liquid dispensing device 11, but can also be externally connected to the main body of the device via a pipe or the like.

[0235] • The liquid container 24 is not limited to boxes such as ink cartridges, but can also be a can that can be assembled and disassembled relative to the mounting part 28.

[0236] The first storage unit 33 or the second storage unit 35 may also have a window that allows the user to visually confirm the liquid volume.

[0237] • In the above embodiments, the on / off valve 36 may not be provided. For example, it may be configured such that both the first storage chamber 62 and the second storage chamber 68 are pressurized during cleaning. This technical concept is also included in the above embodiments. With this technical concept, it is possible to provide a tank unit 26 and a liquid spraying device 11 that can adjust the liquid levels of the two storage chambers 62 and 68 to an appropriate height through a simple structure.

[0238] • Alternatively, it can be configured such that the second inlet 75 is provided on the second storage section 35, and during liquid circulation, the liquid from the liquid nozzle 23 is returned to the second storage chamber 68 through the recovery channel 39.

[0239] • The liquid ejection device can also be an inkjet printing and dyeing device. Furthermore, the printing and dyeing device can also include a tank unit 26.

[0240] • Cleaning can also be performed via suction cleaning instead of pressurized cleaning. In suction cleaning, the cap is in a pressure-sealed state that abuts against the nozzle face 21 of the liquid nozzle 23 in a manner that surrounds all the nozzles 22. By driving the suction pump, the closed space formed by the cap and the nozzle face 21 is set to negative pressure, thereby forcibly discharging the liquid from the nozzles.

[0241] • The liquid ejection device 11 can also be a liquid ejection device that ejects liquids other than ink. The state of the liquid ejected from the liquid ejection device in the form of tiny droplets includes granular, teardrop-shaped, filamentous, and tail-like forms. The liquid referred to here is any material that can be ejected by the liquid ejection device. For example, the liquid can be any material in a liquid phase state, including liquids with high or low viscosity, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, molten metals, and other fluid-like liquids. The liquid includes not only liquids as a state of matter, but also substances formed by dissolving, dispersing, or mixing particles of functional materials composed of solids such as pigments and metal particles in a solvent. Representative examples of liquids include inks or pretreatment and posttreatment liquids for printing, as described in the above embodiments.

[0242] The following text describes the technical ideas and effects derived from the above embodiments and their modifications.

[0243] (A) A tank unit capable of introducing liquid supplied from a liquid reservoir and discharging liquid toward a liquid nozzle capable of spraying liquid, the tank unit comprising: a first inlet for introducing liquid supplied from the liquid reservoir; a first storage chamber for storing the liquid introduced from the first inlet; a first atmospheric vent for opening the first storage chamber to the atmosphere; a discharge channel connected at one end to the first storage chamber; a second storage chamber connected to the other end of the discharge channel for storing liquid supplied from the first storage chamber; a second atmospheric vent for opening the second storage chamber to the atmosphere; and an on / off valve for opening and closing the discharge channel, wherein the first inlet is connected to the first storage chamber via an opening at a midpoint in the vertical direction of the first storage chamber.

[0244] According to this structure, the liquid levels in the two storage chambers can be set to appropriate heights without implementing supply control or the like.

[0245] (B) In the above-mentioned tank unit, the opening may also be positioned in the vertical direction below the center of the first storage chamber.

[0246] According to this structure, when liquid moves between the first storage chamber, the second storage chamber, and the liquid container due to environmental changes, it is possible to suppress the overflow of liquid from the storage chambers.

[0247] (C) In the above-mentioned tank unit, it may also be configured to include a liquid level detection unit, which is capable of detecting the liquid level in the first storage chamber.

[0248] According to this structure, it is possible to detect when the liquid in the liquid reservoir decreases and to prevent liquid from overflowing from the first storage chamber.

[0249] (D) In ​​the above tank unit, the opening and closing valve may also be configured to include a one-way valve that allows the flow of liquid from the first storage chamber to the second storage chamber and restricts the flow from the second storage chamber to the first storage chamber.

[0250] According to this structure, no valve drive source is required.

[0251] (E) In the above-mentioned tank unit, the first storage chamber and the second storage chamber may also be arranged in such a way that they at least partially overlap in the vertical direction.

[0252] This structure enables an efficient layout of the first and second storage rooms.

[0253] (F) In the above-described tank unit, it may also be configured to further include: a discharge section that communicates with the second storage chamber and is capable of discharging the liquid in the second storage chamber toward the liquid nozzle; and a second inlet section that communicates with the first storage chamber and is capable of introducing the liquid recovered from the liquid nozzle.

[0254] According to this structure, the liquid level in the first storage chamber and the liquid level in the second storage chamber can be kept at the same liquid level.

[0255] (G) In the above-mentioned tank unit, it may also be provided with a filter, which is disposed between the second storage chamber and the outlet and is capable of capturing foreign matter contained in the liquid.

[0256] Based on this structure, it is possible to capture foreign matter mixed in due to the replacement of the liquid container, as well as foreign matter that appears due to circulation.

[0257] (H) In the above-described tank unit, the first storage chamber may also have a cover inside, which is disposed vertically above the second inlet portion that opens on the lower surface of the first storage chamber.

[0258] According to this structure, it is possible to suppress the splashing of ink recovered into the first storage chamber onto the entire first storage chamber.

[0259] (I) A liquid ejection device comprising: a liquid ejection head capable of ejecting liquid; the aforementioned tank unit; a supply channel connecting the outlet and the liquid ejection head; and a recovery channel connecting the liquid ejection head and the second inlet.

[0260] Based on this structure, it can also achieve the same effect as the aforementioned tank unit as a liquid ejection device.

[0261] (J) In the above-mentioned liquid ejection device, it may also be provided with a tilt detection unit, which detects the tilt of the tank unit.

[0262] According to this structure, the change in liquid level caused by tilting can be suppressed to a small extent, thus reducing the deviation in liquid level detection.

[0263] (K) In the above-mentioned liquid ejection device, it may also be provided with a pressurization unit that is connected to the second atmospheric opening unit and is capable of pressurizing the second storage chamber.

[0264] Based on this structure, pressurized cleaning can be implemented.

[0265] Symbol Explanation

[0266] 11…Liquid ejection device; 12…Medium; 13…Medium collection section; 14…Stacker; 15…Operating section; 15a…Display section; 16…Image reading section; 17…Automatic feeding section; 19…Control section; 21…Nozzle face; 22…Nozzle; 23…Liquid ejection head; 24, 24C, 24K, 24M, 24Y…Liquid collection body; 25…Supply unit; 26…Tank unit; 27…Drive mechanism; 28…Mounting section; 28o…Insert port; 29…Collection chamber; 30…Outlet section; 31…Outlet valve; 31a…Valve body; 31b…Spring; 31c…Protrusion; 33…First storage section; 33a…Atmospheric opening; 34…Outlet channel; 35…Second storage section; 35a…Atmospheric opening; 36… 37…Opening and closing valve; 38…Supply channel; 39…Supply valve; 40…Recovery channel; 41…Circulation valve; 42…Liquid chamber; 44…Flexible component; 45…First connection; 46…Second connection; 47…Pressurization section; 48…Switching mechanism; 49…Pressure sensor; 50…Atmospheric open channel; 51…Pressurization channel; 52…Connecting channel; 53…Air chamber; 54…Spring; 55…Air channel; 57…Pressurization mechanism; 58…Micro-pressurization section; 60…First inlet; 60a…Inlet port; 60G…Inlet gas phase section; 61…Inlet valve; 61a…Valve body; 62b…Valve body; 62…First storage chamber; 62L…First liquid phase section; 62G…First gas phase section; 63…Liquid level detection section; 63a…First detection section; 6 3b…Second detection section; 63c…Third detection section; 63d…Terminal; 64…First atmospheric opening section; 65…Top wall; 66…First liquid level; 67…Liquid level; 68…Second storage chamber; 68L…Second liquid phase section; 68G…Second gas phase section; 69…Second atmospheric opening section; 70…Second liquid level; 72…Capillary section; 73a…First selector valve; 73b…Second selector valve; 73c…Third selector valve; 73d…Fourth selector valve; 73e…Fifth selector valve; 73f…Sixth selector valve; 73g…Seventh selector valve; 73h…Eighth selector valve; 73i…Ninth selector valve; 73j…Tenth selector valve; 73k…Eleventh selector valve; 74…Outlet section; 75…Second inlet section; 80…Frame; 81…Top plate ; 82…guide path; 83…first force-applying component; 84…locking rod; 85…second force-applying component; 86…first inclined surface; 87…second inclined surface; 88…covering part; 90…supporting component; 90a…base plate; 90b…side rib; 91…rotating shaft; 92…locking rod; 93…extension setting part; 94…shaft; 96…guide recess; 96a…guide hole; 96b…wall part; 97…guide part; 98…tilt detection part; 100…filter; 101…valve body; 102…shaft part; 103…valve part; 103a…valve plate part; 104…anti-detachment part; 105…lip part; 106…fin part; 142…first end wall; 143…upper wall; 144…bottom wall; 145…first side wall; 146…second side wall;147…Second end wall; 150…Circuit board; 241…Release part; 247…Guide part; 247a…First guide part; 247b…Second guide part; 248…Positioning protrusion; 331…Partition wall; 332…Valve hole; 333…Valve seat; 430…Identification part; 447…Supporting part; 447a…First support part; 447b…Second support part; 448…Positioning hole; 497…Engaging part; 521…Connecting terminal; 525…Storage medium; 602…Restriction part; 603…Opening; 604…Lower end; 605…Liquid splash prevention wall; 606…Guide groove; 607…Protrusion; SH…Standard position; HL…Center of the first storage chamber; Z…Vertical direction.

Claims

1. A tank unit, characterized in that, The tank unit can introduce liquid supplied from the liquid reservoir and can discharge liquid toward a liquid nozzle that can spray liquid. The tank unit includes: The first inlet section introduces liquid supplied from the liquid reservoir; The first storage chamber stores the liquid introduced from the first inlet. The first atmospheric opening section is capable of opening the first storage chamber to the atmosphere; An outlet channel is provided, one end of which is connected to the first storage chamber. The second storage chamber is connected to the other end of the outlet channel and stores the liquid supplied from the first storage chamber. The second atmospheric opening section is capable of opening the second storage chamber to the atmosphere; An on / off valve, which can open and close the outlet flow channel. The first inlet is connected to the first storage chamber via a downward-facing opening at a midpoint in the vertical direction. The second storage chamber is positioned such that the opening is located at the midpoint of the vertical direction of the second storage chamber. One end of the outlet channel is located below the opening.

2. The tank unit as described in claim 1, characterized in that, The opening is located vertically below the center of the first storage chamber.

3. The tank unit as described in claim 1, characterized in that, It also includes a liquid level detection unit, which can detect the liquid level in the first storage chamber.

4. The tank unit as described in claim 1, characterized in that, The on / off valve includes a one-way valve that allows the flow of liquid from the first storage chamber to the second storage chamber and restricts the flow from the second storage chamber to the first storage chamber.

5. The tank unit as described in claim 1, characterized in that, The first storage chamber and the second storage chamber are arranged in such a way that they at least partially overlap in the vertical direction.

6. The tank unit as claimed in claim 1, characterized in that, It also has: The outlet is connected to the second storage chamber and is capable of discharging the liquid in the second storage chamber toward the liquid nozzle. The second inlet is connected to the first storage chamber and is capable of introducing liquid recovered from the liquid nozzle.

7. The tank unit as described in claim 6, characterized in that, It also includes a filter, which is disposed between the second storage chamber and the outlet, and is capable of capturing foreign matter contained in the liquid.

8. The tank unit as described in claim 6, characterized in that, The first storage chamber has an internal cover. The cover is positioned vertically above the second inlet portion, which opens on the lower surface of the first storage chamber.

9. The tank unit as described in claim 4, characterized in that, Multiple one-way valves are arranged side by side on the outlet flow channel.

10. The tank unit as claimed in claim 6, characterized in that, The outlet portion is located below the opening portion.

11. A liquid ejection device, characterized in that, have: A liquid ejector head that can eject liquid; The tank unit as described in claim 6; A supply channel that connects the outlet section and the liquid ejector head; A recovery channel connects the liquid ejector head and the second inlet.

12. The liquid ejection device as claimed in claim 11, characterized in that, It also includes a tilt detection unit that detects the tilt of the tank unit.

13. The liquid ejection device as claimed in claim 11, characterized in that, It also includes a pressurization section, which is connected to the second atmospheric opening section and is capable of pressurizing the second storage chamber.

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