Liquid storage unit, liquid supply unit, and liquid ejection device

Abstract

A liquid storage unit, a liquid supply unit, and a liquid ejection device that can prevent an increase in size are provided. [Solution] A liquid storage unit 18 capable of storing liquid, comprising an inlet 27 through which liquid can be injected, a cover part 23 which opens and closes the inlet 27, an outlet 39 through which liquid in the liquid storage unit 18 flows out, a float valve 35 which is a valve whose position changes depending on the amount of liquid remaining in the liquid storage unit 18 and which closes the outlet 39 when the remaining amount of liquid reaches an end state, and a connection part 36 which has a length along the vertical direction Z and connects the cover part 23 and the float valve 35, and the float valve 35 moves from a closed position where it closes the outlet 39 to an open position where it opens the outlet 39 as the cover part 23 moves from a closed position to an open position where it opens the outlet 39.

Description

[Technical Field]

[0001] The present invention relates to a liquid storage unit, a liquid supply unit, and a liquid ejection device. [Background technology]

[0002] For example, Patent Document 1 discloses an ink supply device that is an example of a liquid supply unit. The ink supply device has an ink storage section, an ink flow path, and a float valve. The ink storage section stores ink injected through an ink inlet, which is an example of an inlet. The ink storage section sends ink to the ink flow path from a communication port, which is an example of an outlet.

[0003] The float valve is provided inside the ink container. When the ink container is sufficiently filled with ink, the float valve floats up to open the communication port. When the ink level becomes low, the float valve closes the communication port. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-193616 Summary of the Invention [Problem to be solved by the invention]

[0005] The ink supply device of Patent Document 1 sucks ink from the ink storage unit by applying negative pressure to the ink flow path. Therefore, there is a risk that the float valve, which blocks the communication port, will become stuck to the communication port. To open the ink flow path, it is necessary to generate buoyancy in the float valve that is greater than the negative pressure in the ink flow path. However, if the buoyancy is increased by enlarging the float valve, a structure is required to position the float valve within the ink storage unit, which could result in an increase in the size of the device. [Means for solving the problem]

[0006] A liquid storage unit that solves the above problem is a liquid storage unit that can store liquid, and is equipped with an inlet into which liquid can be injected, a cover part that opens and closes the inlet, an outlet through which liquid in the liquid storage unit flows out, a float valve that changes position depending on the amount of liquid remaining in the liquid storage unit and closes the outlet when the remaining amount of liquid reaches an end state, and a connecting part that has a length along the vertical direction and connects the cover part and the float valve, and the float valve moves from a closed position that blocks the outlet to an open position that opens the outlet as the cover part moves from a closed position to an open position.

[0007] A liquid supply unit that solves the above problem includes the liquid storage unit configured as described above, a supply flow path that causes liquid to flow out of the liquid storage unit, and a supply pump provided in the supply flow path.

[0008] A liquid ejection device that solves the above problem includes a liquid supply unit configured as described above and a liquid ejection section that can eject liquid. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of a liquid ejection device according to the first embodiment. [Figure 2] FIG. 2 is a schematic diagram of the liquid storage unit in the first embodiment. [Figure 3] FIG. 3 is a schematic diagram of the liquid storage unit in the first embodiment. [Figure 4] FIG. 4 is a schematic diagram of the liquid storage unit in the first embodiment. [Figure 5] FIG. 5 is a schematic diagram of a liquid storage unit in the second embodiment. [Figure 6] FIG. 6 is a schematic diagram of a liquid storage unit in the second embodiment. [Figure 7] FIG. 7 is a schematic diagram of a liquid storage unit in the second embodiment. [Figure 8]FIG. 8 is a schematic diagram of a liquid storage unit in the third embodiment. [Figure 9] FIG. 9 is a schematic diagram of a liquid storage unit in the third embodiment. [Figure 10] FIG. 10 is a schematic diagram of a liquid storage unit in the third embodiment. [Figure 11] FIG. 11 is a schematic diagram of a liquid storage unit according to the third embodiment. [Figure 12] FIG. 12 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 13] FIG. 13 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 14] FIG. 14 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 15] FIG. 15 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 16] FIG. 16 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 17] FIG. 17 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 18] FIG. 18 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 19] FIG. 19 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 20] FIG. 20 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 21] FIG. 21 is a schematic diagram of a lead-out portion in the fourth embodiment. [Figure 22] FIG. 22 is a schematic diagram of a lead-out portion in the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] [First embodiment] A first embodiment of a liquid storage unit, a liquid supply unit, and a liquid ejection device will be described below with reference to the drawings. The liquid ejection device is an inkjet printer that prints by ejecting ink, which is an example of a liquid, onto a medium such as paper, fabric, vinyl, plastic parts, or metal parts.

[0011] <Liquid discharge device> As shown in FIG. 1, the liquid ejection device 11 includes a liquid ejection section 12 and a liquid supply unit 13.

[0012] The liquid ejection unit 12 is capable of ejecting liquid. The liquid ejection unit 12 prints on the medium 14 by ejecting the liquid onto the medium 14. The liquid ejection unit 12 has a nozzle surface 16 in which one or more nozzles 15 open. The liquid ejection unit 12 ejects the liquid from the nozzles 15.

[0013] <Liquid supply unit> The liquid supply unit 13 may include a liquid storage unit 18 , a supply channel 19 , and a supply pump 20 .

[0014] The liquid storage unit 18 is capable of storing liquid. The upstream end of the supply flow path 19 in the supply direction D is connected to the liquid storage unit 18. The supply flow path 19 causes the liquid to flow out from the liquid storage unit 18. The downstream end of the supply flow path 19 in the supply direction D is connected to the liquid discharger 12. The supply flow path 19 supplies the liquid stored in the liquid storage unit 18 to the liquid discharger 12.

[0015] The supply pump 20 is provided in the supply flow path 19. The supply pump 20 supplies the liquid sucked from the liquid storage unit 18 to the liquid discharge portion 12. The supply pump 20 may be, for example, a diaphragm pump, a tube pump, a gear pump, a piston pump, or the like.

[0016] 2, in the drawing, the liquid supply unit 13 is placed on a horizontal plane, with the direction of gravity indicated by the Z axis, and directions along the horizontal plane indicated by the X and Y axes. The X, Y, and Z axes are perpendicular to one another. In the following description, the direction parallel to the X axis is also referred to as the width direction X, the direction parallel to the Y axis is also referred to as the depth direction Y, and the direction parallel to the Z axis is also referred to as the vertical direction Z.

[0017] <Liquid storage unit> As shown in FIG. 2, the liquid storage unit 18 may have a main body 22, a cover portion 23, and an outlet portion 24.

[0018] The main body 22 may have a reservoir 26 , an inlet 27 , a connection port 28 , and a supply port 29 . The reservoir 26 stores the liquid injected through the injection port 27. The position of the liquid surface 30 of the liquid stored in the reservoir 26 changes depending on the remaining amount.

[0019] The inlet 27, the connection port 28, and the supply port 29 connect the storage chamber 26 to the outside. In this embodiment, the inlet 27, the connection port 28, and the supply port 29 are located above the liquid level 30 when the maximum amount of liquid is stored in the storage chamber 26. The inlet 27 is capable of injecting liquid. The connection port 28 is provided for passing the outlet portion 24. The supply port 29 is provided for passing, for example, a tube that constitutes the supply flow path 19.

[0020] The cover part 23 has a rotation shaft 32. The rotation shaft 32 may be rotatably supported on the main body 22. The cover part 23 is displaced by rotating around the rotation shaft 32. The cover part 23 is displaceable between a closed position shown in FIG. 2 and an open position shown in FIG. 4. The closed position is a position where the injection port 27 is blocked. The open position is a position where the injection port 27 is opened. The cover part 23 opens and closes the injection port 27. When the cover part 23 is positioned in the open position, liquid can be injected through the injection port 27. The rotation shaft 32 may be provided at the rear end of the cover part 23 in the depth direction Y. When the rotation shaft 32 is positioned at the rear, the user can easily inject liquid into the injection port 27 from the front.

[0021] <Derivation part> The outlet 24 may be provided in the reservoir 26. The outlet 24 may include a holder 34, a float valve 35, and a connection 36.

[0022] The holder 34 movably holds the float valve 35. The holder 34 is, for example, cylindrical. The holder 34 may have an inlet portion 38, an outlet port 39, and a guide portion 40.

[0023] The holder 34 may have a plurality of inflow sections 38. The inflow sections 38 may be slits extending in the vertical direction Z from the upper end of the holder 34. The inflow sections 38 are located above the outflow opening 39.

[0024] The outlet 39 opens to the bottom of the holder 34. The outlet 39 is located below the float valve 35. The upstream end of the supply flow path 19 is connected to the outlet 39. The supply flow path 19 may be inserted into the storage chamber 26 from the supply port 29, and may have its upstream end connected to the outlet 39. The outlet 39 allows the liquid in the liquid storage unit 18 to flow out.

[0025] The guide portion 40 guides the movement of the float valve 35. The guide portion 40 is, for example, the inner circumferential surface of the holder 34. The guide portion 40 may have a regulating portion 42. The regulating portion 42 regulates the movement range of the float valve 35. The regulating portion 42 is, for example, a claw that protrudes inward from the inner circumferential surface of the holder 34. The regulating portion 42 holds the float valve 35 in the holder 34. The regulating portion 42 comes into contact with the float valve 35 to prevent the float valve 35 from jumping out of the holder 34. The regulating portion 42 may be located at the upper end of the holder 34.

[0026] The float valve 35 is configured to be able to open and close the outlet 39. The specific gravity of the float valve 35 is smaller than the specific gravity of the liquid stored in the liquid storage unit 18. Therefore, the float valve 35 floats on the liquid. The float valve 35 is a valve whose position changes depending on the amount of liquid remaining in the liquid storage unit 18. The float valve 35 moves up and down depending on the amount of liquid remaining.

[0027] The float valve 35 is movable between an open position shown in Figure 2 and a closed position shown in Figure 3. The open position is a position away from the outlet 39. When the float valve 35 is in the open position, the outlet 39 is connected to the inlet 38. The open position is a position that opens the outlet 39. The closed position is a position lower than the open position. When the float valve 35 is in the closed position, the outlet 39 is separated from the inlet 38. The closed position is a position that closes the outlet 39.

[0028] The connection part 36 connects the cover part 23 and the float valve 35. In this embodiment, the connection part 36 has a lower end connected to the float valve 35 and an upper end connected to the rotating shaft 32. The connection part 36 is provided so as to be able to be wound around the rotating shaft 32. At least the portion of the connection part 36 that is wound around the rotating shaft 32 is flexible. The connection part 36 may be made of, for example, thread, string, rope, chain, wire, etc., or a combination of these. The connection part 36 is passed through the connection port 28. The connection part 36 has a length along the vertical direction Z. In the vertical direction Z, the length of the connection part 36 is longer than the length from the rotating shaft 32 to the float valve 35.

[0029] <Operation of the First Embodiment> The operation of this embodiment will be described. 2, when there is a sufficient amount of liquid remaining, the float valve 35 floats up and contacts the defining portion 42. That is, the float valve 35 is in the open position. When the float valve 35 moves away from the outlet 39, it is also referred to as the float valve 35 opening. When the float valve 35 opens, liquid can be discharged from the storage chamber 26 to the supply flow path 19.

[0030] As shown in FIG. 3, when liquid is discharged from the storage chamber 26, the liquid level 30 drops. The float valve 35 drops along with the liquid level 30. The float valve 35 closes the outlet 39 when the remaining amount of liquid reaches an end state. The end state is a state in which the remaining amount of liquid is small. In the end state, the liquid level 30 is located above the outlet 39. In this embodiment, the float valve 35 blocking the outlet 39 is also referred to as the float valve 35 being closed. When the float valve 35 is closed, liquid cannot be discharged from the storage chamber 26 to the supply flow path 19.

[0031] When the supply pump 20 is driven with the float valve 35 closed, the negative pressure increases upstream of the supply pump 20. When the negative pressure acts on the float valve 35 that closes the outlet 39, the float valve 35 becomes less likely to float up.

[0032] 4, the float valve 35 moves from the closed position to the open position as the cover part 23 moves from the closed position to the open position. Specifically, when the cover part 23, which is positioned in the closed position, moves to the open position, the rotating shaft 32 rotates together with the cover part 23. The connecting part 36 is wound around the rotating shaft 32, and pulls up the float valve 35. As a result, the float valve 35 moves from the closed position and opens the outlet 39.

[0033] When the cover part 23 moves to the open position, the injection port 27 is opened, allowing the liquid to be injected. When the liquid is injected, the float valve 35 floats up due to its own buoyancy and hits the defining part 42, restricting its movement.

[0034] <Effects of the first embodiment> The effects of this embodiment will be described. (1-1) The connection part 36 connects the cover part 23 and the float valve 35. The connection part 36 moves the float valve 35 in conjunction with the movement of the cover part 23, so the outlet 39 can be opened without relying on the buoyancy of the float valve 35. Therefore, even when a small float valve 35 is used, for example, it is possible to reduce the risk that the outlet 39 will remain blocked, thereby preventing the device from becoming too large.

[0035] (1-2) The cover rotates around the rotary shaft 32, thereby winding up the connection part 36. The wound up connection part 36 can pull up the float valve 35. Therefore, the sticking of the float valve 35 can be released with a simple structure.

[0036] (1-3) The guide portion 40 guides the movement of the float valve 35. The guide portion 40 has a regulating portion 42. The regulating portion 42 regulates the movement range of the float valve 35. Therefore, the risk of the float valve 35 coming off the guide portion 40 can be reduced.

[0037] [Second embodiment] Next, a second embodiment of the liquid storage unit, liquid supply unit, and liquid ejection device will be described with reference to the drawings. This second embodiment differs from the first embodiment in the liquid supply unit. Since the second embodiment is otherwise substantially the same as the first embodiment, the same components are designated by the same reference numerals and redundant description will be omitted.

[0038] <Liquid supply unit> As shown in FIG. 5, the liquid supply unit 13 may include a detection unit 44 and a control unit 45.

[0039] The detection unit 44 detects whether the cover unit 23 is open or closed. The detection unit 44 may indirectly detect whether the cover unit 23 is open or closed by detecting the position of the connection unit 36. The detection unit 44 is, for example, a photoelectric sensor. The detection unit 44 may detect the position of the connection unit 36 ​​based on whether or not the irradiated light is blocked.

[0040] The control unit 45 may control the supply pump 20. The control unit 45 may comprehensively control the driving of each mechanism in the liquid supply unit 13, and control various operations executed in the liquid supply unit 13. The control unit 45 may comprehensively control the driving of each mechanism in the liquid ejection device 11, and control various operations executed in the liquid ejection device 11.

[0041] The control unit 45 may be configured as a circuit including: α: one or more processors that execute various processes according to a computer program; β: one or more dedicated hardware circuits that execute at least some of the various processes; or γ: a combination thereof. The hardware circuit is, for example, an application-specific integrated circuit. The processor includes a CPU and memory such as RAM and ROM, and the memory stores program code or instructions configured to cause the CPU to execute processes. The memory, i.e., computer-readable medium, includes any readable medium that can be accessed by a general-purpose or dedicated computer.

[0042] The cover part 23 may have a first engaged part 47. The first engaged part 47 is, for example, a gear that rotates around the rotation shaft 32. The first engaged part 47 rotates as the cover part 23 moves between the open position and the closed position.

[0043] The float valve 35 may have a second engaged portion 48. In this embodiment, the second engaged portion 48 is a protrusion. The connecting portion 36 may have a rod portion 50, a first engaging portion 51, a second engaging portion 52, a rack 53, and a defining portion 42.

[0044] The rod portion 50 has a length along the vertical direction Z. The rod portion 50 may have rigidity. The rod portion 50 is passed through the connection port 28. The second engagement portion 52, the rack 53, and the defining portion 42 may be provided on the rod portion 50.

[0045] The first engaging portion 51 engages with the first engaged portion 47. The first engaging portion 51 is a gear that meshes with the first engaged portion 47. The rack 53 meshes with the first engaging portion 51. The rack 53 may be located at the upper end of the rod portion 50. The first engaged portion 47, the first engaging portion 51, and the rack 53 are located outside the storage chamber 26. The first engaging portion 51 transmits the rotation of the cover portion 23 to the rod portion 50. Therefore, when the cover portion 23 opens and closes, the rod portion 50 moves. The rod portion 50 may move back and forth in the vertical direction Z.

[0046] The second engaging portion 52 may be located at the lower end of the rod portion 50. The second engaging portion 52 is located below the second engaged portion 48. The second engaging portion 52 is engageable with the second engaged portion 48.

[0047] The defining portion 42 may be located between the second engaging portion 52 and the rack 53. The defining portion 42 is located above the second engaged portion 48. The second engaged portion 48 is located between the second engaging portion 52 and the defining portion 42.

[0048] <Operation of the Second Embodiment> The operation of this embodiment will be described. 5, when there is a sufficient amount of liquid remaining, the float valve 35 floats up and contacts the defining portion 42. That is, the float valve 35 is in the open position. When the float valve 35 is open, liquid can be discharged from the storage chamber 26 to the supply flow path 19.

[0049] When the cover part 23 is in the closed position, the control part 45 drives the supply pump 20. When the cover part 23 is in the closed position, the rod part 50 is located below the detection part 44. Therefore, the detection part 44 does not detect the connection part 36. When the detection part 44 does not detect the connection part 36, the control part 45 may determine that the cover part 23 is in the closed position and drive the supply pump 20.

[0050] As shown in Figure 6, when liquid is discharged from the storage chamber 26, the liquid level 30 drops. The float valve 35 drops along with the liquid level 30. The float valve 35 closes the outlet 39 when the remaining amount of liquid reaches the end state. When the float valve 35 is closed, liquid cannot be discharged from the storage chamber 26 to the supply flow path 19. A negative pressure from the supply pump 20 acts on the float valve 35 when it is in the closed position.

[0051] As shown in Figure 7, the float valve 35 moves from the closed position to the open position as the cover part 23 moves from the closed position to the open position. Specifically, when the cover part 23, which is positioned in the closed position, moves to the open position, the first engaged part 47 rotates clockwise in Figure 7. When the rotation of the first engaged part 47 is transmitted to the rod part 50 via the first engaging part 51 and the rack 53, the rod part 50 rises. At this time, the second engaging part 52 lifts the second engaged part 48. As a result, the float valve 35 moves from the closed position and opens the outlet 39.

[0052] When cover portion 23 is in the open position, detection portion 44 detects rod portion 50. Control portion 45 indirectly detects that cover portion 23 is in the open position by having detection portion 44 detect connection portion 36. When detection portion 44 detects that cover portion 23 is in the open position, control portion 45 does not drive supply pump 20. As a result, the supply of liquid from liquid storage unit 18 is stopped.

[0053] When liquid is poured into the float valve 35, the float valve 35 rises due to its own buoyancy and hits the defining portion 42, restricting its movement. 5, when the cover portion 23 moves from the open position to the closed position, the first engaged portion 47 rotates counterclockwise in FIG. 5. When the rotation of the first engaged portion 47 is transmitted to the rod portion 50 via the first engaging portion 51 and the rack 53, the rod portion 50 descends. At this time, the regulating portion 42 presses down the second engaged portion 48. When the descending rod portion 50 disengages from the detecting portion 44, the control portion 45 may determine that the cover portion 23 has moved from the open position and drive the supply pump 20.

[0054] <Effects of the second embodiment> The effects of this embodiment will be described. (2-1) The connecting portion 36 engages with the cover portion 23 and the float valve 35 by the first engaging portion 51 and the second engaging portion 52. Therefore, the sticking of the float valve 35 can be released with a simple configuration.

[0055] (2-2) The first engaged portion 47 of the cover portion 23 is a gear. The first engaging portion 51 of the connecting portion 36 is a gear that meshes with the first engaged portion 47. The first engaging portion 51 meshes with a rack 53 of the connecting portion 36. That is, the connecting portion 36 moves when the rotation of the cover is transmitted via the first engaged portion 47, the first engaging portion 51, and the rack 53. Therefore, the sticking of the float valve 35 can be released with a simple configuration.

[0056] (2-3) When the cover part 23 is in the open position, the float valve 35 may not be able to close the outlet 39. In this regard, when the cover part 23 is in the open position, the control part 45 does not drive the supply pump 20. Therefore, it is possible to reduce the risk that the supply pump 20 will suck air out of the liquid storage unit 18.

[0057] [Third embodiment] Next, a third embodiment of the liquid storage unit, liquid supply unit, and liquid ejection device will be described with reference to the drawings. This third embodiment differs from the first embodiment in the outlet portion. Since the third embodiment is otherwise substantially the same as the first embodiment, the same components are designated by the same reference numerals and redundant description will be omitted.

[0058] 8, the cover portion 23 may have a first engaged portion 47. In this embodiment, the first engaged portion 47 is an elongated hole. The float valve 35 may have a second engaged portion 48. In this embodiment, the second engaged portion 48 is an elongated hole.

[0059] The connecting portion 36 may have a rod portion 50, a first engaging portion 51, and a second engaging portion 52. The rod portion 50 has a length along the vertical direction Z. The rod portion 50 may have rigidity. The first engaging portion 51 is a protrusion that is inserted into the first engaged portion 47. The first engaging portion 51 may be located at the upper end of the rod portion 50. The second engaging portion 52 is a protrusion that is inserted into the second engaged portion 48. The second engaging portion 52 may be located at the lower end of the rod portion 50.

[0060] <Operation of the Third Embodiment> The operation of this embodiment will be described. As shown in Figure 8, when there is a sufficient amount of liquid remaining, the float valve 35 floats up and moves away from the outlet 39. The movement of the float valve 35 is restricted when the lower end of the second engaged portion 48 comes into contact with the second engaging portion 52. The float valve 35 is in the open position. When the float valve 35 is open, liquid can be discharged from the storage chamber 26 to the supply flow path 19.

[0061] As shown in Figure 9, when liquid is discharged from the storage chamber 26, the liquid level 30 drops. The float valve 35 drops along with the liquid level 30. The float valve 35 closes the outlet 39 when the remaining amount of liquid reaches the end state. When the float valve 35 is closed, liquid cannot be discharged from the storage chamber 26 to the supply flow path 19. A negative pressure from the supply pump 20 acts on the float valve 35 when it is in the closed position.

[0062] 10, the float valve 35 moves from the closed position to the open position as the cover part 23 moves from the closed position to the open position. Specifically, when the cover part 23, which is positioned in the closed position, moves to the open position, the first engaged part 47 pulls up the float valve 35 via the rod part 50. The float valve 35 moves from the closed position to open the outlet 39.

[0063] 11, when liquid is poured into the float valve 35, the float valve 35 rises due to its own buoyancy. The movement of the float valve 35 is restricted when the lower end of the second engaged portion 48 comes into contact with the second engaging portion 52. When the cover portion 23 moves from the open position to the closed position, the second engaging portion 52 presses down on the second engaged portion 48.

[0064] <Effects of the third embodiment> The effects of this embodiment will be described. (3-1) The first engaging portion 51 is movable along the first engaged portion 47, which is an elongated hole. The second engaging portion 52 is movable along the second engaged portion 48, which is an elongated hole. Therefore, the float valve 35 can be moved in a direction different from the direction in which the cover portion 23 moves.

[0065] [Fourth embodiment] Next, a fourth embodiment of the liquid storage unit, liquid supply unit, and liquid ejection device will be described with reference to the drawings. This fourth embodiment differs from the second and third embodiments in the outlet portion. Since the fourth embodiment is otherwise substantially the same as the other embodiments, the same components are designated by the same reference numerals and redundant description will be omitted.

[0066] <Derivation part> As shown in FIG. 12, the outlet portion 24 may include a holder 34, a float valve 35, a connecting portion 36, and a releasing portion 55.

[0067] The float valve 35 may have a second engaged portion 48. In this embodiment, the second engaged portion 48 is a protrusion. The connecting portion 36 may include a rod portion 50 , a second engaging portion 52 , and a biasing member 56 .

[0068] The release portion 55 may be fixed to the holder 34 or the main body 22. The release portion 55 is provided immovably. The release portion 55 may include a first guide surface 57a, a second guide surface 57b, and a third guide surface 57c.

[0069] The first guide surface 57a and the third guide surface 57c may be surfaces parallel to the vertical direction Z, which is the movement direction of the rod portion 50. The first guide surface 57a is positioned lower than the third guide surface 57c. In the depth direction Y, the distance from the first guide surface 57a to the second engaged portion 48 is shorter than the distance from the third guide surface 57c to the second engaged portion 48.

[0070] The second guide surface 57b may be a surface that is inclined with respect to the vertical direction Z. In the vertical direction Z and the depth direction Y, the second guide surface 57b is located between the first guide surface 57a and the third guide surface 57c.

[0071] The rod portion 50 may have a defining portion 42 and a support shaft 59. The support shaft 59 is provided at the lower end of the rod portion 50. The support shaft 59 rotatably supports the second engaging portion 52. In this embodiment, the second engaging portion 52 is a claw that hooks onto the second engaged portion 48. The second engaging portion 52 has a claw portion 60 and a guided portion 61. The claw portion 60 is capable of engaging with the second engaged portion 48. The guided portion 61 is in contact with the first guide surface 57a to the third guide surface 57c and is capable of sliding movement.

[0072] The biasing member 56 is, for example, a compression coil spring. The biasing member 56 biases the second engaging portion 52. The biasing member 56 presses the second engaging portion 52 toward the second engaged portion 48 while being supported by the rod portion 50. The biasing member 56 presses the guided portion 61 against the first guide surface 57a to the third guide surface 57c.

[0073] <Operation of the Fourth Embodiment> The operation of this embodiment will be described. 12, when the remaining amount of liquid is in the end state, the float valve 35 is in the closed position. When the cover part 23 is in the closed position, the claw part 60 is located below the second engaged part 48. When the cover part 23 is in the closed position, the guided part 61 is pressed against the first guide surface 57a.

[0074] 13, the rod portion 50 rises as the cover portion 23 moves from the closed position to the open position. When the rod portion 50 rises, the second engaging portion 52 and the biasing member 56 rise together. The second engaging portion 52 lifts the float valve 35 as the claw portion 60 hooks onto the second engaged portion 48. The float valve 35 opens the outlet 39. Therefore, even if negative pressure increases in the supply flow path 19 between the float valve 35 and the supply pump 20, the negative pressure is eliminated by opening the outlet 39.

[0075] 14, when the rod portion 50 is further raised, the guided portion 61 is guided by the second guide surface 57b. The second engaging portion 52 rotates around the support shaft 59. The second engaging portion 52 tilts against the biasing force of the biasing member 56 so that the guided portion 61 moves away from the second engaged portion 48.

[0076] As shown in FIG. 15 , when the cover portion 23 moves from the closed position to the open position, the second engaging portion 52 hooks the second engaged portion 48 and moves the float valve 35 to the open position, after which the release portion 55 releases the engagement with the second engaged portion 48. The release portion 55 moves the second engaging portion 52 against the biasing force of the biasing member 56, thereby disengaging the second engaging portion 52 from the second engaged portion 48. When the guided portion 61 of the second engaging portion 52 moves to the third guide surface 57c, the claw portion 60 disengages from the second engaged portion 48. The disengaged float valve 35 falls back to the closed position. Even when the float valve 35 returns to the closed position, the negative pressure in the supply flow path 19 is eliminated, so the float valve 35 can easily be displaced from the closed position.

[0077] 16, when the cover part 23 is in the open position, the claw part 60 is retracted from the movement path of the second engaged part 48. Therefore, when liquid is poured into the storage chamber 26 and the liquid level 30 rises, the float valve 35 floats up to a position where the second engaged part 48 abuts against the defining part 42.

[0078] 17, the rod portion 50 descends as the cover portion 23 moves from the open position to the closed position. The rod portion 50 causes the defining portion 42 to press down the second engaged portion 48, bringing the float valve 35 closer to the outlet 39. When the cover portion 23 is in the closed position and there is a sufficient amount of liquid remaining, the float valve 35 opens the outlet 39.

[0079] As shown in FIG. 16, when printing is performed with the cover portion 23 in the open position, the liquid flows out of the storage chamber 26 and the liquid level 30 drops. 18, when the cover part 23 is in the open position, the claw part 60 is retracted from the movement path of the second engaged part 48. Therefore, the float valve 35 descends as the liquid level 30 drops, and closes the outlet 39 when the remaining amount of liquid reaches the end state.

[0080] 19, the float valve 35 can be moved to the closed position even when the cover part 23 remains in the open position, but the float valve 35 that has been moved to the closed position may become stuck due to negative pressure in the supply flow path 19. A stuck float valve 35 will not float up and will remain in the closed position even when liquid is injected and the liquid level 30 rises. In this case, the user opens and closes the cover part 23.

[0081] 20, the rod portion 50 descends as the cover portion 23 moves from the open position to the closed position. When the second engaging portion 52 hits the second engaged portion 48, the second engaging portion 52 rotates to avoid the second engaged portion 48. As a result, the second engaging portion 52 passes through the second engaged portion 48.

[0082] As shown in FIG. 21, when the cover portion 23 moves to the closed position, the claw portion 60 of the second engaging portion 52 is positioned below the second engaged portion 48. 22, when the cover part 23 located in the closed position moves toward the open position, the second engaging part 52 hooks onto the second engaged part 48, lifting the float valve 35. The float valve 35, which is away from the outlet 39, floats due to buoyancy and hits the regulating part 42, restricting its movement.

[0083] <Effects of the Fourth Embodiment> The effects of this embodiment will be described. (1-7) After the float valve 35 is moved to the open position, the second engaging portion 52 is disengaged from the second engaged portion 48. Therefore, the float valve 35 moves to the open position as the cover portion 23 moves, and is able to change its position depending on the amount of liquid remaining. Therefore, even if the cover portion 23 remains in the open position and liquid flows out of the liquid storage unit 18, resulting in the end state, the float valve 35 can close the outlet 39.

[0084] [Example of change] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0085] In the first embodiment, the upper end of the connection portion 36 may be connected to the cover portion 23 at a position different from the rotation shaft 32. For example, the connection portion 36 may be passed through the injection port 27 and connected to a portion of the cover portion 23 that closes the injection port 27. The cover portion 23 may be provided detachably with respect to the main body 22.

[0086] In each embodiment, the liquid supply unit 13 may include a detection unit 44 and a control unit 45. The detection unit 44 may directly detect whether the cover unit 23 is open or closed. For example, the detection unit 44 may be a rotary encoder that detects the rotation of the rotation shaft 32. For example, the detection unit 44 may be a contact sensor. The contact sensor may detect the position of the cover unit 23 by not contacting the cover unit 23 when it is in the closed position but by contacting the cover unit 23 when it is in the open position.

[0087] The liquid supply unit 13 may not include the supply pump 20. The liquid supply unit 13 may supply the liquid by means of a hydraulic head. The liquid ejection device 11 may be a liquid ejection device that ejects or discharges liquids other than ink. The liquid ejected as minute droplets from the liquid ejection device may be in the form of granules, tears, or strings. The liquid referred to here may be any material that can be ejected from the liquid ejection device. For example, the liquid may be in any liquid phase, including fluids such as high or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and metal melts. The liquid may refer not only to a single state of matter, but also to solid functional material particles, such as pigments and metal particles, dissolved, dispersed, or mixed in a solvent. Typical examples of liquids include inks and liquid crystals, as described in the above embodiments. Here, ink encompasses various liquid compositions, such as general water-based inks and oil-based inks, as well as gel inks and hot-melt inks. Specific examples of liquid ejection devices include devices that eject liquids containing dispersed or dissolved materials such as electrode materials and color materials used in the manufacture of liquid crystal displays, electroluminescent displays, surface-emitting displays, and color filters. The liquid ejection device may be a device that ejects bioorganic materials used in biochip manufacture, a device used as a precision pipette to eject sample liquids, a textile printing device, a microdispenser, or the like. The liquid ejection device may be a device that ejects lubricating oil with pinpoint accuracy onto precision machinery such as watches and cameras, or a device that ejects transparent resin liquids such as ultraviolet-curing resins onto substrates to form micro-hemispherical lenses, optical lenses, and the like used in optical communication elements. The liquid ejection device may also be a device that ejects etching liquids such as acids or alkalis to etch substrates, etc.

[0088] [Definition] The phrase "at least one" as used herein means "one or more" of the desired options. As an example, the phrase "at least one" as used herein means "only one option" or "both of two options" when the number of options is two. As another example, the phrase "at least one" as used herein means "only one option," "any combination of two options," or "any combination of three or more options" when the number of options is three or more.

[0089] [Note] The technical concepts and effects that can be understood from the above-described embodiment and modified examples will be described below.

[0090] [1] The liquid storage unit is a liquid storage unit capable of storing liquid, and comprises an inlet into which liquid can be injected, a cover part that opens and closes the inlet, an outlet through which liquid in the liquid storage unit flows out, a float valve that changes position depending on the amount of liquid remaining in the liquid storage unit and closes the outlet when the amount of liquid remaining reaches an end state, and a connecting part that has a length along the vertical direction and connects the cover part and the float valve, and the float valve moves from a closed position that closes the outlet to an open position that opens the outlet as the cover part moves from a closed position to an open position.

[0091] According to this configuration, the connecting part connects the cover part and the float valve. The connecting part moves the float valve as the cover part moves, so the outlet can be opened without relying on the buoyancy of the float valve. Therefore, even when a small float valve is used, the risk of the outlet remaining blocked can be reduced, and the size of the device can be reduced.

[0092] [2] In the liquid storage unit of [1] above, the cover portion may be displaced by rotating around a rotation shaft, and the connection portion may be provided so as to be retractable onto the rotation shaft. With this configuration, the cover rotates around the rotation axis to wind up the connecting part. The wound connecting part can pull up the float valve. Therefore, it is possible to release the stuck float valve with a simple configuration.

[0093] [3] The liquid storage unit of [2] above may include a guide portion that guides the movement of the float valve, and the guide portion may have a defining portion that defines the movement range of the float valve. According to this configuration, the guide portion guides the movement of the float valve. The guide portion has a limiting portion. The limiting portion limits the movement range of the float valve. Therefore, it is possible to reduce the risk of the float valve coming off the guide portion.

[0094] [4] In the liquid storage unit of [1] above, the connection portion may have a first engaging portion and a second engaging portion, the cover portion may have a first engaged portion that engages with the first engaging portion, and the float valve may have a second engaged portion that engages with the second engaging portion.

[0095] According to this configuration, the connecting portion engages with the cover portion and the float valve by the first engaging portion and the second engaging portion, so that the float valve can be released from sticking with a simple configuration.

[0096] [5] In the liquid storage unit of [4] above, the first engaged portion and the second engaged portion may be elongated holes, the first engaging portion may be a protrusion inserted into the first engaged portion, and the second engaging portion may be a protrusion inserted into the second engaged portion.

[0097] With this configuration, the first engaging portion is movable along the first engaged portion, which is an elongated hole. The second engaging portion is movable along the second engaged portion, which is an elongated hole. Therefore, the float valve can be moved in a direction different from the direction in which the cover portion moves.

[0098] [6] In the liquid storage unit of [4] above, the cover portion may be displaced by rotating around a rotation axis, the first engaged portion may be a gear that rotates around the rotation axis, the first engaging portion may be a gear that meshes with the first engaged portion, and the connecting portion may have a rack that meshes with the first engaging portion.

[0099] According to this configuration, the first engaged portion of the cover portion is a gear. The first engaging portion of the connecting portion is a gear that meshes with the first engaged portion. The first engaging portion meshes with the rack of the connecting portion. In other words, the connecting portion moves as the rotation of the cover is transmitted via the first engaged portion, the first engaging portion, and the rack. Therefore, the float valve can be released from sticking with a simple configuration.

[0100] [7] The liquid storage unit of [4] above may comprise a biasing member that biases the second engaging portion, and a release portion that disengages the second engaging portion from the second engaged portion by moving the second engaging portion against the biasing force of the biasing member, wherein the second engaged portion is a protrusion and the second engaging portion is a claw that hooks onto the second engaged portion, and when the cover portion moves from the closed position to the open position, the second engaging portion hooks onto the second engaged portion to move the float valve to the open position, and then the release portion releases the engagement with the second engaged portion.

[0101] With this configuration, the second engaging portion disengages from the second engaged portion after moving the float valve to the open position. Therefore, the float valve moves to the open position as the cover portion moves, and is able to change its position depending on the amount of liquid remaining. Therefore, even if the cover portion remains in the open position and liquid flows out of the liquid storage unit, resulting in an end state, the float valve can close the outflow port.

[0102] [8] The liquid supply unit may include any one of the liquid storage units [1] to [7] above, a supply flow path for discharging liquid from the liquid storage unit, and a supply pump provided in the supply flow path.

[0103] This configuration can achieve the same effects as the liquid storage unit described above. [9] The liquid supply unit of [8] above includes a detection unit that detects the opening and closing of the cover unit, and a control unit that controls the supply pump, and the control unit may not drive the supply pump when the detection unit detects that the cover unit is in the open position.

[0104] When the cover is in the open position, the float valve may not be able to close the outlet. In this regard, with this configuration, when the cover is in the open position, the control unit does not drive the supply pump. This reduces the risk of the supply pump sucking air out of the liquid storage unit.

[0105]

[10] A liquid ejection device may include the liquid supply unit according to [8] or [9] above, and a liquid ejection section capable of ejecting liquid. This configuration can achieve the same effects as the liquid storage unit described above. [Explanation of symbols]

[0106] 11...liquid discharge device, 12...liquid discharge portion, 13...liquid supply unit, 14...medium, 15...nozzle, 16...nozzle surface, 18...liquid storage unit, 19...supply flow path, 20...supply pump, 22...main body, 23...cover portion, 24...outlet portion, 26...storage chamber, 27...inlet, 28...connection port, 29...supply port, 30...liquid level, 32...rotating shaft, 34...holder, 35...float valve, 36...connection portion, 38...inlet portion, 39...outlet , 40...guide portion, 42...regulating portion, 44...detection portion, 45...control portion, 47...first engaged portion, 48...second engaged portion, 50...rod portion, 51...first engaging portion, 52...second engaging portion, 53...rack, 55...releasing portion, 56...urging member, 57a...first guide surface, 57b...second guide surface, 57c...third guide surface, 59...support shaft, 60...claw portion, 61...guided portion, D...supply direction, X...width direction, Y...depth direction, Z...vertical direction.

Claims

1. A liquid storage unit capable of storing liquid, an injection port into which a liquid can be injected; a cover portion that opens and closes the injection port; an outlet for discharging the liquid in the liquid storage unit; a float valve that changes position depending on the amount of liquid remaining in the liquid storage unit and closes the outlet when the amount of liquid remaining reaches an end state; a connecting portion having a length along a vertical direction and connecting the cover portion and the float valve; Equipped with The liquid storage unit is characterized in that the float valve moves from a closed position that blocks the outlet to an open position that opens the outlet as the cover portion moves from a closed position to an open position.

2. The cover portion is displaced by rotating about a rotation axis, The liquid storage unit according to claim 1 , wherein the connecting portion is provided so as to be retractable around the rotating shaft.

3. a guide portion for guiding the movement of the float valve; 3. The liquid storage unit according to claim 2, wherein the guide portion has a defining portion that defines a range of movement of the float valve.

4. the connecting portion has a first engaging portion and a second engaging portion, the cover portion has a first engaged portion that engages with the first engaging portion, 2. The liquid storage unit according to claim 1, wherein the float valve has a second engaged portion that engages with the second engaging portion.

5. the first engaged portion and the second engaged portion are elongated holes, the first engaging portion is a protrusion that is inserted into the first engaged portion, 5. The liquid storage unit according to claim 4, wherein the second engaging portion is a protrusion that is inserted into the second engaged portion.

6. The cover portion is displaced by rotating about a rotation axis, the first engaged portion is a gear that rotates around the rotation shaft, the first engaging portion is a gear that meshes with the first engaged portion, The liquid storage unit according to claim 4 , wherein the connecting portion has a rack that engages with the first engaging portion.

7. a biasing member that biases the second engagement portion; a release portion that releases the engagement between the second engaging portion and the second engaged portion by moving the second engaging portion against the biasing force of the biasing member; Equipped with the second engaged portion is a protrusion, the second engaging portion is a claw that hooks onto the second engaged portion, The liquid storage unit described in claim 4, characterized in that when the cover portion moves from the closed position to the open position, the second engagement portion hooks onto the second engaged portion to move the float valve to the open position, and then the release portion releases engagement with the second engaged portion.

8. The liquid storage unit according to claim 1; a supply flow path for causing liquid to flow out from the liquid storage unit; a supply pump provided in the supply flow path; A liquid supply unit comprising:

9. a detection unit that detects whether the cover is open or closed; a control unit that controls the supply pump; Equipped with 9. The liquid supply unit according to claim 8, wherein the control unit does not drive the supply pump when the detection unit detects that the cover unit is in the open position.

10. A liquid supply unit according to claim 8; a liquid ejection unit capable of ejecting liquid; A liquid ejection device comprising:

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