Supply unit and liquid ejection device

Abstract

The present application relates to a supply unit and a liquid ejection apparatus. The present application provides a supply unit with good operability in mounting a liquid storage body. The supply unit is configured to attach and detach one or more liquid storage bodies storing liquid, and includes a support member extending along a guide path intersecting a vertical line and having a front end region where a start of the guide path is located and a base end region where an end of the guide path is located, a rotation shaft having an axis intersecting both the vertical line and the guide path and disposed in the base end region, and a liquid introduction portion disposed below the support member and configured to be connected to the liquid storage body. The support member is configured to rotate around the rotation shaft between a guide position where the one or more liquid storage bodies are guided along the guide path and a connection position where the one or more liquid storage bodies are connected to the liquid introduction portion.

Description

Technical Field

[0001] This invention relates to a supply unit and a liquid ejection device. Background Technology

[0002] Patent Document 1 discloses a main container as an example of a liquid reservoir. This main container is detachably mounted on a printer, which is an example of a liquid dispensing device. Ink from the main container flows down through a connecting pipe extending downwards from the ink reservoir and is supplied to the printer. Therefore, the main container is mounted on the printer by moving from above the printer toward the printer located below it.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2005-161645

[0004] For example, when installing a liquid reservoir above a liquid dispensing device, the operator needs to either raise the reservoir to above eye level while visually inspecting the installation location, or lower it to the target position without visually inspecting the location. Therefore, loading and unloading operations can sometimes be difficult, especially when the reservoir is positioned far from eye level or when the liquid reservoir is heavy. Summary of the Invention

[0005] The supply unit for solving the above-mentioned problem is configured to house one or more liquid reservoirs that can be detachably installed. The supply unit includes: a support member extending along a guide path intersecting a vertical line, having a front end region where the beginning of the guide path is located and a base end region where the end of the guide path is located; a rotation shaft having an axis intersecting both the vertical line and the guide path and disposed in the base end region; and a liquid inlet portion disposed below the support member and configured to connect to the liquid reservoirs. The support member is configured to rotate about the rotation shaft between a guide position that guides the one or more liquid reservoirs along the guide path and a connection position where the one or more liquid reservoirs are connected to the liquid inlet portion. Attached Figure Description

[0006] Figure 1 This is a perspective view of the liquid ejection device involved in the embodiment.

[0007] Figure 2 This is a perspective view of the liquid container involved in the embodiment.

[0008] Figure 3 yes Figure 2 Rear view of the liquid container.

[0009] Figure 4 This is a schematic diagram of the supply unit involved in the implementation method.

[0010] Figure 5 This indicates that the liquid container is inserted into Figure 4 A cross-sectional view of the front end area of ​​the support component when supplying the unit.

[0011] Figure 6 yes Figure 5 A cross-sectional view of the support component when it is positioned at the connection point.

[0012] Figure 7 It means Figure 4 A schematic diagram of the front end region of the support component when the liquid reservoir is located near the beginning of the guide path.

[0013] Figure 8 It means Figure 7 A schematic diagram of the front end region of the support component when the liquid reservoir reaches the end of the guide path.

[0014] Figure 9 It means Figure 4 A cross-sectional view of the base end region of the support component.

[0015] Figure 10 yes Figure 1 A schematic diagram of the supply unit and drive mechanism of the liquid ejection device.

[0016] Figure 11 This is a flowchart representing the liquid filling routine.

[0017] Figure 12 This is a flowchart representing a liquid circulation routine.

[0018] Figure 13 This is a flowchart representing the printing routine.

[0019] Figure 14 This is a flowchart representing the pressurized discharge routine.

[0020] Figure 15 This is a flowchart representing the pressure accumulator discharge routine.

[0021] Figure 16 This is a flowchart representing the micro-pressurization discharge routine.

[0022] Figure 17 This is a flowchart representing the header replacement routine.

[0023] Symbol Explanation

[0024] 11: Liquid ejection device; 12: Medium; 13: Medium collection unit; 14: Stacker; 15: Operation unit; 16: Image reading unit; 17: Automatic feeding unit; 19: Control unit; 21: Nozzle face; 22: Nozzle; 23: Liquid nozzle; 24, 24C, 24K, 24M, 24Y: Liquid collection body; 25: Supply unit; 26: Drive mechanism; 28: Mounting part; 28o: Insertion port; 29: Collection chamber; 30: Outlet part; 31: Outlet valve; 33: First storage part; 34: Connecting path; 35: Second storage part; 36: Check valve; 37: Supply flow path; 38: Supply valve; 39: Recovery flow path; 40: Circulation valve; 41: Liquid chamber; 42: Flexible component; 44: First connecting part; 45: Second connecting part; 47: Pressurizing part; 48: Switching mechanism; 49: Pressure sensor; 50: Atmospheric open path; 51: Pressurized flow path; 52: Connecting flow path; 53: Air chamber; 54: Spring; 55: Air flow path; 57: Pressurizing mechanism; 58: Micro-pressurizing part; 60: Liquid inlet part; 61: Inlet valve; 62: First storage chamber; 63: Liquid volume sensor; 64: First gas-liquid separation membrane; 65: Top plate; 66: First liquid level; 68: Second storage chamber; 69: Second gas-liquid separation membrane; 70: Second liquid level; 72: Thin tube part; 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; 80: Frame; 81: Locking lever; 82: Guide path; 83: First force-applying component; 84: Engaging lever; 85: Second force-applying component; 86: First inclined surface; 87: Second inclined surface; 90: Support component; 90a: Base plate; 90b: Side rib; 91: Rotating shaft; 92: Locking lever; 93: Extension setting part; 94: Shaft; 95: First arm; 96: Second arm; 97: Third arm; 98: Stop; 99: Third force-applying component; 142: First end wall; 143 144: Top 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; 273: Push-out mechanism; 274: Fourth force-applying component; 275: Push-out component; 430: Identification part; 447: Receiving part; 447a: First receiving part; 447b: Second receiving part; 448: Positioning hole; 497: Engaging part; 521: Connecting terminal; 525: Storage medium; 630: Identification shape; 721: Electrical connection part; 739: Connector; 780: Force-applying spring; 782: Holding component. Detailed Implementation

[0025] Hereinafter, embodiments of the supply unit 25 and the liquid ejection device 11 will be described with reference to the accompanying drawings. The liquid ejection device 11 is, for example, an inkjet printer that ejects ink, which is a liquid, onto a medium such as paper for printing.

[0026] In the accompanying drawings, it is assumed that the liquid ejection device 11 is placed on a horizontal plane. The Z-axis represents the direction of gravity, and the X-axis and Y-axis represent the directions along the horizontal plane. The X-axis, Y-axis, and Z-axis 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.

[0027] A. Overall Composition of the Liquid Ejection Device

[0028] like Figure 1 As shown, the liquid dispensing device 11 may also include one or more media receiving sections 13, stackers 14, and operation sections 15. Each media receiving section 13 is, for example, a container capable of holding one or more media 12. The stacker 14 is configured to receive the printed media 12. The operation section 15 is, for example, a touch panel for operating the liquid dispensing device 11. The touch panel may also be arranged so that it faces the front of the liquid dispensing device 11.

[0029] The liquid ejection device 11 may also include an image reading unit 16 for reading images of the original document and an automatic feeder 17 for feeding the original document to the image reading unit 16. The image reading unit 16 and the automatic feeder 17 are, for example, disposed above the stacker 14.

[0030] The liquid dispensing device 11 includes a control unit 19 that controls various actions performed by the liquid dispensing device 11. The control unit 19 can be configured as a circuit, which includes: 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 combination thereof. The processor includes memories such as a CPU (Central Processing Unit), RAM (Random Access Memory), and ROM (Read-Only Memory), which store program code or instructions configured to cause the CPU to perform processes. Memory, or computer-readable medium, includes all available media accessible by a general-purpose or special-purpose computer.

[0031] The liquid dispensing device 11 includes a supply unit 25. The supply unit 25 may also include a mounting portion 28 for detachably mounting one or more liquid collection bodies 24. The mounting portion 28 may also have multiple slots corresponding to the multiple liquid collection bodies 24. The mounting portion 28 has an insertion port 28o for inserting the liquid collection body 24. The insertion port 28o is open, for example, facing the front of the liquid dispensing device 11. The liquid dispensing device 11 may also include a cover (not shown) covering the insertion port 28o. This cover is also movable between a position covering the insertion port 28o and a position with the insertion port 28o open.

[0032] The insertion port 28o is configured to open, for example, on the front side of the liquid dispensing device 11. In this case, the liquid reservoir 24 is inserted through the insertion port 28o, for example, from the front side of the liquid dispensing device 11 in the direction along the Y-axis.

[0033] Multiple liquid containers 24 (24C, 24M, 24Y, 24K) can also hold different types of liquids, such as inks of different colors. For example, liquid containers 24C, 24M, 24Y, and 24K can hold cyan, magenta, yellow, and black inks, respectively. The liquid containers 24 can also 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. The width of liquid container 24K, i.e., its length along the X-axis, can also be longer than the other liquid containers 24C, 24M, and 24Y.

[0034] B. Composition of the liquid container

[0035] like Figure 2 as well as Figure 3 As shown, the liquid reservoir 24 is, for example, an ink cartridge 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 in the liquid dispensing device 11, it is first inserted from the first end wall 142.

[0036] like Figure 2 As shown, the liquid container 24 may also have an identification portion 430 on its bottom wall 144 for identifying the type of liquid container 24. The identification portion 430 may, for example, be a plurality of protrusions arranged in the width direction.

[0037] The liquid reservoir 24 may also have a positioning hole 448 in its bottom wall 144. The positioning hole 448 may also be a recessed portion opening in the bottom wall 144. The liquid reservoir 24 may also have a discharge portion 30 opening in the bottom wall 144. The liquid contained in the liquid reservoir 24 is discharged from the liquid reservoir 24 through the discharge portion 30. The liquid reservoir 24 may also have a release portion 241 protruding downward from the bottom wall 144. The release portion 241, the positioning hole 448, and the discharge portion 30 may also be arranged sequentially from the second end wall 147 toward the first end wall 142.

[0038] like Figure 2 As shown, the liquid reservoir 24 may also have a circuit board 150 in the portion where the corner where the bottom wall 144 intersects with the first end wall 142 is cut off. The circuit board 150 may also have connection terminals 521 and a storage medium 525. The storage medium 525 may also store information related to the liquid reservoir 24, such as information related to the liquid contained in the liquid reservoir 24.

[0039] The liquid reservoir 24 may also have two receiving portions 447 extending along the Y-axis on the first sidewall 145 and the second sidewall 146, respectively. On each sidewall 145, 146, the receiving portion 447 may also include a first receiving portion 447a and a second receiving portion 447b with different heights. The first receiving portion 447a may also be a groove extending along the bottom wall 144. The second receiving portion 447b is located at a higher position than the first receiving portion 447a and is shorter along the Y-axis than the first receiving portion 447a. The second receiving portion 447b may also be disposed near the circuit board 150.

[0040] like Figure 3 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 disposed above the release portion 241 and opening in the second end wall 147. The engaging portion 497 may also be disposed at the center in the width direction of the second end wall 147.

[0041] C. Composition of the installation section

[0042] like Figure 4 As shown, the mounting section 28 includes a box-shaped frame 80, a support member 90, a rotating shaft 91, and a liquid inlet 60. The support member 90, the rotating shaft 91, and the liquid inlet 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 inward side of the frame 80. At this time, the direction of movement of the liquid reservoir 24, that is, the insertion direction toward the mounting section 28, is along the Y-axis.

[0043] The support component 90 follows a straight guide path 82 that intersects the vertical line (Z-axis). Figure 4(Represented by a hollow arrow) The guide path 82 extends along the direction of movement (Y-axis). The support member 90 has a front end region where the beginning of the guide path 82 is located and a base end region where the end of the guide path 82 is located. The base end region of the support member 90 and the rotation axis 91 are located inside the frame 80, i.e., away from the insertion port 28°. The support member 90 may also have a base plate 90a and two side ribs 90b. The two side ribs 90b are respectively located at both ends of the base plate 90a in the width direction.

[0044] The rotating shaft 91 has an axis that intersects both the vertical line (Z-axis) and the guide path 82 (Y-axis) and is disposed 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 ( Figure 4 The connection point between the liquid reservoir 24 and the liquid inlet 60 (represented by a single-dot dash) is shown in the image. Figure 4 (represented by a double-dotted line in the middle) rotates around the axis 91.

[0045] The liquid inlet 60 is disposed below the support member 90. When the support member 90 is in the connected position, the liquid inlet 60 is connected to the liquid reservoir 24. The liquid inlet 60 can also be disposed at an angle relative to the guide path 82 (horizontal). More specifically, the liquid inlet 60 can also be disposed with its front end (upper end) closer to the insertion port 28° than its base end (lower end). For example, the centerline of the liquid inlet 60 can form an angle greater than 0° and less than 15° relative to the vertical line (Z-axis).

[0046] The support member 90 may also have one or more guide portions 247 for guiding 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.

[0047] The guide portion 247 may also 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 in the length direction of the support member 90. The second guide portion 247b is located higher than the first guide portion 247a and is shorter in length 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 liquid inlet portion 60 (see reference). Figure 7 ).

[0048] The mounting section 28 may also include a first force-applying member 83 that 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 section 28, the support member 90 is positioned in the guide position by the force applied by the first force-applying member 83.

[0049] like Figure 5 As shown, the mounting portion 28 may also have an upwardly protruding positioning protrusion 248 near the liquid inlet portion 60. The liquid reservoir 24 is positioned by engaging with the positioning protrusion 248 through the positioning hole 448. The positioning protrusion 248 may also be tilted at the same angle as the liquid inlet portion 60. The portion of the base plate 90a located above the positioning protrusion 248 and the liquid inlet portion 60 is cut off (see reference). Figure 7 ).

[0050] like Figure 5 as well as Figure 6 As shown, the mounting portion 28 may also include a locking rod 84 arranged opposite to the front end of the support member 90. The locking rod 84, the positioning protrusion 248, and the liquid inlet portion 60 may also be arranged sequentially along the Y-axis. The locking rod 84 may also have a base end (lower end) and a front end (upper end) fixed to the frame 80. The mounting portion 28 may also include a second force-applying member 85 that applies force to the front end of the locking rod 84 toward the support member 90.

[0051] 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 also have a first inclined surface 86 extending obliquely downward from the front 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.

[0052] The first inclined surface 86 is at the support member 90 from the guide position ( Figure 5 The position shown) along the direction of the connection position ( Figure 6 When the support member 90 rotates along the rotation path (as shown), it 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, the second inclined surface 87 engages with the liquid reservoir 24.

[0053] like Figure 7 as well as Figure 8 As shown, the mounting part 28 may also have a locked position that restricts the rotation of the support member 90. Figure 7 The position shown) and the release position that allows rotation of the support component 90 ( Figure 8The locking lever 92 is movable between the positions shown. The locking lever 92 may also be configured, for example, in the direction of movement of the liquid reservoir 24, on the engaging lever 84 (see reference). Figure 5 The locking lever 92 is configured to engage with the release part 241 when the liquid reservoir 24 reaches the end of the guide path 82, thereby shifting from the locked position to the released position.

[0054] The support member 90 has an extension portion 93 extending downward from its front end. The extension portion 93 has a stop 98 extending in the width direction at its front end. The locking lever 92 is supported by the extension portion 93 in a manner that allows it to rotate about an axis 94.

[0055] The locking lever 92 includes a first arm 95 extending upward from the shaft 94, a second arm 96 extending downward from the shaft 94, and a third arm 97 extending diagonally downward from the shaft 94. The third arm 97 is positioned inside the mounting portion 28 compared to the second arm 96. The mounting portion 28 may also have a third force-applying member 99 that applies force to the front end of the first arm 95 toward the outside of the mounting portion 28. The third force-applying member 99 is, for example, a leaf spring.

[0056] The frame 80 has a locking bar 81 extending in the width direction on the inner side of the mounting portion 28, which is closer to the third arm 97. Figure 7 The locking position shown indicates that the first arm 95, which is subjected to force by the third force-applying component 99, is centered on axis 94. Figure 7 A force is applied in a clockwise direction, but further rotation is limited by the contact between the third arm 97 and the stop 98. At this time, a locking lever 81 is located directly below the third arm 97. In the locked position, a small distance may also exist between the lower end of the third arm 97 and the locking lever 81.

[0057] When the mounting portion 28 is inserted into the front end (first end wall 142) of the liquid reservoir 24, the locking lever 92 is in the locked position. If the liquid reservoir 24, which has entered the frame 80, tilts forward and downward, it will collide with the base plate 90a. Therefore, when the support member 90 holding the locking lever 92 is about to rotate downward, the third arm 97 contacts the locking lever 81. This restricts the rotation of the support member 90. Thus, it is possible to prevent the liquid reservoir 24 from tilting forward and downward and contacting the liquid inlet portion 60 midway through the guide path.

[0058] like Figure 8 As shown, when the liquid reservoir 24 reaches the end of the movement path, the release part 241 presses the first arm 95 in the movement direction. Thus, the locking lever 92 overcomes the force of the third force-applying component 99 and... Figure 8Rotate counterclockwise as indicated by the middle arrow. This releases the engagement of the third arm 97 with the locking lever 81. At this point, the locking lever 81 is no longer directly below the third arm 97. Therefore, the support member 90 is allowed to rotate together with the locking lever 92 towards the connection position.

[0059] like Figure 9 As shown, the support member 90 may also have one or more electrical connection portions 721 and connectors 739 in the base region. The electrical connection portions 721 are configured to be electrically connected to the connection terminals 521 of the liquid reservoir 24. The electrical connection portion 721 is, for example, a metal plate with a front end protruding toward the liquid reservoir 24. The electrical connection portion 721 can also elastically deform under external force. The connector 739 is electrically connected to one or more electrical connection portions 721. The connector 739 is connected to the control unit 19 of the liquid ejection device 11 (see reference 19) via wiring (not shown). Figure 1 Electrical connection.

[0060] The mounting portion 28 may also include a retaining member 782 for holding the electrical connection portion 721 and the connector 739, and a force-applying spring 780. The force-applying spring 780 may also have a first end that engages with the support member 90. Figure 9 The middle (left end) and the second end that engages with the retaining member 782 ( Figure 9 (The middle is the right end).

[0061] The support member 90 may also have an identification shape 630, which corresponds to the identification portion 430 of the liquid container 24. The identification shape 630 may also be positioned near the end of the guide path, for example, near the electrical connection portion 721. The identification shape 630 is used to identify whether the liquid container 24 is inserted into the appropriate slot. The identification shape 630 may also be a rib with a shape that varies depending on the type (e.g., color) of the liquid contained in the liquid container 24. When an incorrect liquid container 24 is inserted, the identification portion 430 does not engage with the identification shape 630, thus preventing the insertion. This reduces the likelihood of installing the wrong type of liquid container 24.

[0062] The mounting section 28 may also include a push-out mechanism 273. The push-out mechanism 273 is configured to apply force to the liquid reservoir 24 supported by the support member 90 toward the beginning of the guide path. The push-out mechanism 273 may, for example, have one or more fourth force-applying members 274 and push-out members 275. One or more fourth force-applying members 274 may, for example, include two fourth force-applying members 274 arranged along the width direction. The fourth force-applying member 274 may, for example, be a helical spring. The fourth force-applying member 274 may also have a first end fixed to the base region of the support member 90. Figure 9 The middle (left end) and the second end fixed to the ejector component 275 ( Figure 9(The middle part is the right end). The force of the fourth force-applying component 274 can also be set to move the liquid reservoir 24 along the guide path until the connection terminal 521 is disengaged from the electrical connection part 721.

[0063] like Figure 9 As shown, when the liquid reservoir 24 reaches the end of the guide path, the liquid reservoir 24 presses against the ejector 275. Thus, when the fourth force-applying member 274 is compressed, the ejector mechanism 273 applies force to the liquid reservoir 24 toward the beginning of the guide path.

[0064] When the liquid reservoir 24 reaches the end of the guide path, the connection terminal 521 of the liquid reservoir 24 presses against the electrical connection portion 721. This compresses the force spring 780. Let Fa represent the force exerted by the compressed force spring 780 on the liquid reservoir 24. Through this force Fa, the electrical connection portion 721 is pressed against the circuit board 150. As a result, the electrical connection portion 721 can maintain good contact with the connection terminal 521. Furthermore, through its own elastic deformation, the electrical connection portion 721 contacts the connection terminal 521 with appropriate pressure.

[0065] D. Composition of the supply unit

[0066] like Figure 4 As shown, the supply unit 25 may also include a first storage section 33 disposed below the support member 90. A liquid inlet section 60 protrudes upward from the first storage section 33. When the liquid inlet section 60 is connected to the liquid reservoir 24, liquid within the liquid reservoir 24 is introduced into the first storage section 33 through the liquid inlet section 60 and temporarily stored therein. The supply unit 25 may also include an atmospheric opening path 50 configured to open the first storage section 33 to the atmosphere. The atmospheric opening path 50 may also be disposed above the first storage section 33.

[0067] The supply unit 25 may also include a second storage section 35 disposed below the support member, a connecting passage 34, and a one-way valve 36 capable of closing the connecting passage 34. The connecting passage 34 has an upstream end communicating with the first storage section 33 and a downstream end communicating with the second storage section 35. The second storage section 35 is connected to the first storage section 33 via the connecting passage 34. Liquid in the first storage section 33 flows into the second storage section 35 through the connecting passage 34.

[0068] A one-way valve 36 is disposed between the first storage section 33 and the second storage section 35 to open and close the connecting passage 34. The one-way valve 36 may also be disposed between the connecting passage 34 and the first storage section 33. The one-way valve 36 may also be configured to allow liquid to flow from the first storage section 33 to the second storage section 35, and restrict liquid flow from the second storage section 35 to the first storage section 33. The one-way valve 36 may also be an on-off valve that is opened and closed by control.

[0069] E. Composition of the supply unit and drive mechanism

[0070] like Figure 10 As shown, the liquid ejection device 11 includes a liquid nozzle 23, a supply flow path 37 for supplying liquid from a supply unit 25 to the liquid nozzle 23, and a drive mechanism 26 for driving the supply unit 25. The liquid nozzle 23 has one or more nozzles 22 and nozzle surfaces 21 through which these nozzles 22 open. The supply unit 25 is configured to supply liquid contained in a liquid reservoir 24 to the liquid nozzle 23 through a first storage section 33, a connecting passage 34, a second storage section 35, and the supply flow path 37. The liquid nozzle 23 is configured to eject the supplied liquid from the nozzles 22.

[0071] If the liquid ejection device 11 has multiple supply units 25 corresponding to different colors, it can eject inks of multiple colors for color printing. A single drive mechanism 26 can also drive multiple supply units 25 together. The liquid ejection device 11 can also have multiple drive mechanisms 26 that drive multiple supply units 25 respectively.

[0072] The liquid nozzle 23 can also be detachably mounted on the main body of the liquid ejection device 11. The liquid nozzle 23 can also be configured with its nozzle surface 21 tilted relative to the horizontal. The liquid nozzle 23 can also perform printing by ejecting liquid onto the medium 12 in an tilted posture. The liquid nozzle 23 can also be arranged in a row along the width of the medium 12. Alternatively, the liquid nozzle 23 can be a serial type that prints while moving along the width of the medium 12.

[0073] The liquid reservoir 24 may also include a reservoir chamber 29 for storing liquid. The liquid stored in the reservoir chamber 29 is discharged through the discharge section 30. The discharge section 30 may also include a discharge valve 31. The reservoir chamber 29 is, 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 supply unit 25 can hold.

[0074] The supply unit 25 may also include a supply valve 38 capable of closing the supply flow path 37, a recovery flow path 39, a circulation valve 40 capable of opening and closing the recovery flow path 39, and a liquid chamber 41. The liquid chamber 41 is disposed in the middle of the recovery flow path 39. The recovery flow path 39 has an upstream end connected to the liquid nozzle 23 and a downstream end connected to the first storage unit 33. The recovery flow path 39 is a flow path for causing the liquid in the liquid nozzle 23 to flow towards the supply unit 25.

[0075] Liquid chamber 41 is positioned midway through the recovery flow path 39, specifically between liquid nozzle 23 and circulation valve 40. A portion of liquid chamber 41 is defined by flexible member 42. The volume of liquid chamber 41 changes through the flexural deformation of flexible member 42.

[0076] The liquid nozzle 23 may also have a first connecting portion 44 connecting the recovery flow path 39 and a second connecting portion 45 connecting the supply flow path 37. The recovery flow path 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 flow path 37 has an upstream end connected to the second storage section 35 and a downstream end connected to the second connecting portion 45. When the liquid nozzle 23 is in an inclined position, the first connecting portion 44 may also be positioned higher than the second connecting portion 45.

[0077] The drive mechanism 26 includes a pressurizing section 47 for pressurizing the second storage section 35. The drive mechanism 26 may also include a switching mechanism 48 connected to the pressurizing section 47, and a pressure sensor 49 for detecting pressure. The drive mechanism 26 may also include an atmospheric opening path 50 connected to the first storage section 33, a pressurizing flow path 51 connected to the second storage section 35, and a connecting flow path 52 connecting the atmospheric opening path 50 and the pressurizing flow path 51 to the pressurizing section 47. The drive mechanism 26 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 path 55 connected to the air chamber 53. The spring 54 reduces pressure fluctuations in the recovery flow path 39 and the liquid nozzle 23 by pressing the flexible member 42.

[0078] The pressurizing unit 47 is, for example, a pipe pump having rollers and a tube. In this case, the rollers rotate while squeezing the tube, thereby delivering air. The tube (not shown) of the pressurizing unit 47 has a first end connected to the air flow path 55 and a second end connected to the connecting flow path 52. When driven in forward rotation, the pressurizing unit 47 delivers air taken from the air flow path 55 to the connecting flow path 52. When driven in reverse rotation, the pressurizing unit 47 delivers air taken from the connecting flow path 52 to the air flow path 55.

[0079] The supply unit 25 may also include a pressurizing mechanism 57 configured to pressurize the liquid within the supply flow path 37. The pressurizing mechanism 57 includes, for example, a pressurizing section 47, an air chamber 53, and an air flow path 55. The supply unit 25 may also include a micro-pressurizing section 58 disposed midway through the recovery flow path 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, pressurizing the liquid within the recovery flow path 39. More specifically, the pressurizing mechanism 57 pressurizes the flexible member 42 from the outside of the liquid chamber 41.

[0080] Next, the first storage section 33 will be described.

[0081] The first storage unit 33 may also include a liquid inlet 60, a first storage chamber 62, a liquid volume sensor 63, and a first gas-liquid separation membrane 64. The liquid inlet 60 may also include an inlet valve 61. The liquid volume sensor 63 detects the amount of liquid stored in the first storage chamber 62. The first gas-liquid separation membrane 64 separates the first storage chamber 62 from the atmospheric open passage 50. The first gas-liquid separation membrane 64 has the property of allowing gas to pass through but not liquid.

[0082] When the liquid reservoir 24 is installed, the outlet valve 31 and the inlet valve 61 open. During the installation of the liquid reservoir 24 in the mounting section 28, valves 31 and 61 remain open. When the liquid reservoir 24 is installed in the mounting section 28, the inlet valve 61 may also open before the outlet valve 31. This prevents liquid from easily leaking from the liquid reservoir 24.

[0083] A liquid inlet 60 is disposed on the upper part of the first storage section 33. The liquid inlet 60, for example, penetrates through the top plate 65 of the first storage chamber 62. The lower end of the liquid inlet 60 is disposed within the first storage chamber 62, located below the top plate 65. The upper end of the liquid inlet 60 is disposed outside the first storage chamber 62, located above the top plate 65.

[0084] The lower end of the liquid inlet 60 is located below the nozzle surface 21. Therefore, the first liquid level 66 of the liquid stored in the first storage section 33 varies within a range lower than the nozzle surface 21. Specifically, the liquid in the liquid reservoir 24 flows into the first storage section 33 via the outlet 30 and the liquid inlet 60 due to the water level difference with the liquid in the first storage section 33.

[0085] At this time, an amount of air equivalent to the amount of liquid flowing into the first storage section 33 flows from the first storage section 33 to the liquid receiving body 24 via the liquid inlet 60 and outlet 30. Simultaneously, the first liquid level 66 rises only by the amount of liquid flowing in. When the first liquid level 66 reaches the lower end of the liquid inlet 60, the flow of air from the first storage section 33 to the liquid receiving body 24 stops. Since the receiving chamber 29 is sealed, when the air flow stops, the pressure inside the receiving chamber 29 drops by an amount corresponding to the amount of liquid flowing in. When the negative pressure inside the receiving chamber 29 is greater than the water level of the liquid inside the receiving chamber 29, the flow of liquid from the liquid receiving body 24 to the first storage section 33 stops.

[0086] As liquid flows from the first storage section 33 to the second storage section 35, the first liquid level 66 drops. At this time, air flows into the receiving chamber 29 via the liquid inlet 60 and outlet 30, reducing the negative pressure within the receiving chamber 29. When the negative pressure within the receiving chamber 29 becomes lower than the liquid level within the receiving chamber 29, liquid in the liquid reservoir 24 flows into the first storage section 33. As a result, while liquid exists in the liquid reservoir 24, the first liquid level 66 remains at a standard position near the lower end of the liquid inlet 60. When the liquid disappears from the liquid reservoir 24, the first liquid level 66 drops to a position lower than the standard position.

[0087] The liquid level sensor 63 can also 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. When the first liquid level 66 is at the full position, the first storage section 33 stores the maximum amount of liquid. The control unit 19 can also determine that the liquid container 24 is empty when the liquid level sensor 63 detects that the first liquid level 66 is below the standard position, and instruct the user to replace the liquid container 24.

[0088] The standard position is set, for example, in the first storage chamber 62, above the downstream end of the recovery flow path 39. In this case, when the first liquid level 66 is in the standard position, the liquid in the first storage section 33 can flow into the liquid nozzle 23 through the recovery flow path 39.

[0089] Next, the second storage section 35 will be described.

[0090] The second storage section 35 may also have a second storage chamber 68 and a second gas-liquid separation membrane 69 that separates the second storage chamber 68 from the pressurized flow path 51. The second gas-liquid separation membrane 69, like the first gas-liquid separation membrane 64, has the property of allowing gas to pass through but not liquid.

[0091] The liquid in the first storage section 33 flows into the second storage section 35 due to the water level difference between the liquid in the first storage section 62 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 becomes the same height as the first liquid level 66. In other words, the second liquid level 70 is maintained at a standard position approximately at the same height as the lower end of the liquid inlet 60, varying within a range lower than 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 liquid is consumed by the liquid nozzle 23, the liquid stored in the second storage section 35 is supplied to the liquid nozzle 23.

[0092] When the pressure in the second storage section 35 is greater than the pressure in the first storage section 33, the one-way valve 36 closes the connection passage 34. Therefore, when the pressurizing section 47 pressurizes the second storage section 35, the one-way valve 36 blocks the connection passage 34.

[0093] Control Unit 19 (Reference) Figure 1 The control valve 38 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 flow path 37 when the pressurization section 47 pressurizes. The circulation valve 40 can open and close the recovery flow path 39.

[0094] Next, the switching mechanism 48 will be explained.

[0095] The switching mechanism 48 includes a thin tube section 72 as part of the connecting flow path 52 and first selector valves 73a to eleventh selector valves 73k. The thin tube section 72 is a thin and meandering tube in which the flow of liquid is greatly restricted relative to the flow of air.

[0096] When the first selector valve 73a is open, the air flow path 55 is connected to the atmosphere. When the second selector valve 73b is open, the air flow path 55 is connected to the pressure sensor 49. When the third selector valve 73c is open, the air flow path 55 is open, and the pressurization section 47 is connected to the air chamber 53.

[0097] When the fourth selector valve 73d opens, the connecting flow path 52 between the pressurizing section 47 and the eighth selector valve 73h is connected to the atmosphere. When the fifth selector valve 73e opens, the connecting flow path 52 is connected to the pressure sensor 49. When the sixth selector valve 73f and the seventh selector valve 73g open, the connecting flow path 52 is connected to the atmosphere. When the eighth selector valve 73h opens, the connecting flow path 52 is open. When the ninth selector valve 73i opens, the thin tube section 72 is connected to the atmosphere. When the tenth selector valve 73j opens, the atmospheric opening path 50 opens, and the first storage section 33 is connected to the connecting flow path 52. When the eleventh selector valve 73k opens, the pressurizing flow path 51 opens, and the second storage section 35 is connected to the connecting flow path 52.

[0098] When the pressure inside the air chamber 53 changes, the switching mechanism 48 opens the second selector valves 73b to 73d and closes the other selector valves. In this state, when the pressurizing unit 47 rotates forward, air inside the air chamber 53 is discharged through the air flow path 55 and the connecting flow path 52, causing the pressure inside the air chamber 53 to decrease. In this state, when the pressurizing unit 47 rotates in reverse, air is fed into the air chamber 53 through the connecting flow path 52 and the air flow path 55, causing the pressure inside the air chamber 53 to increase. At this time, the pressure sensor 49 can also detect the pressure in the air flow path 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.

[0099] With the first storage chamber 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 path 50 and the connecting flow path 52.

[0100] With the second storage chamber 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 path 51 and the connecting flow path 52.

[0101] 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, while closing the other selection valves. In this state, when the pressurizing unit 47 rotates forward, air flows into the second storage chamber 68 through the air flow path 55, the connecting flow path 52, and the pressurizing flow path 51, causing the pressure in the second storage chamber 68 to rise. At this time, the pressure sensor 49 can also detect the pressure in the connecting flow path 52, the pressurizing flow path 51, and the second storage chamber 68. The control unit 19 can also control the operation of the pressurizing unit 47 based on the detection result of the pressure sensor 49.

[0102] F. The role of the supply unit

[0103] The function of the liquid reservoir 24 when it is installed in the supply unit 25 will be explained.

[0104] like Figure 4As shown, the liquid reservoir 24 is inserted into the frame 80 through the insertion port 28o. When the first receiving portion 447a of the liquid reservoir 24 engages with the first guide portion 247a within the frame 80, the liquid reservoir 24 is guided by the first guide portion 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 portions 247a arranged in the width direction. In addition, midway along 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 )limit.

[0105] When the liquid reservoir 24 reaches the vicinity of the end of the guide path 82, the second receiving portion 447b engages with the second guide portion 247b. In the vertical direction, the electrical connection portion 721 can also be disposed between the first guide portion 247a and the second guide portion 247b. In this case, the connection terminal 521 is appropriately positioned in the vertical direction toward the electrical connection portion 721. Positioning of the liquid reservoir 24 in the width direction can also be achieved by using the identification shape 630 disposed near the electrical connection portion 721.

[0106] When the liquid reservoir 24 reaches the end of the guide path 82, the connection terminal 521 contacts the electrical connection portion 721. This allows for connection between the circuit board 150 and the control unit 19 (see reference 1). 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 located in a position that can be operated from outside the frame 80.

[0107] Next, the operator overcomes the force of the fourth force-applying component 274 and presses the liquid reservoir 24 in the insertion direction, and pushes the rear end of the liquid reservoir 24 ( Figure 4 (The middle part is the right end) Press downwards. Thus, the supporting component 90 overcomes the force of the first force-applying component 83 and moves about the rotation axis 91 as the center. Figure 4 The liquid container 24 rotates clockwise. During the rotation of the liquid container 24, firstly, the positioning protrusion 248 enters the positioning hole 448 (see reference). Figure 2 Next, the outlet 30 is connected to the liquid inlet 60.

[0108] At this time, the force-applying spring 780 (reference) Figure 9 The liquid reservoir 24 extends and retracts, thereby maintaining the connection between the connection terminal 521 and the electrical connection portion 721, and allowing slight displacement of the liquid reservoir 24 along the Y-axis. The positioning protrusion 248 is disposed near the liquid inlet portion 60 and is inclined at the same angle as the liquid inlet portion 60, so that the outlet portion 30 is properly guided toward the liquid inlet portion 60.

[0109] During the rotation of the support member 90 to 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, overcomes the force of the second force-applying member 85 and moves outward from the rotation path of the support member 90. Figure 5 The liquid container 24 is disengaged by moving in a disengaging manner (right side in the middle). When the protrusion of the engaging rod 84 engages with the engaging portion 497 of the liquid container 24, the support member 90 is held in the connected position by the force of the second force-applying member 85. Thus, the installation of the liquid container 24 is completed.

[0110] like Figure 6 As shown, when the liquid reservoir 24 is installed, the outlet 30 is connected to the liquid inlet 60. Since the liquid reservoir 24 is positioned above the liquid inlet 60, the liquid in the liquid reservoir 24 is introduced into the first storage section 33 through the liquid inlet 60 by means of the water level difference.

[0111] Next, the function of the liquid container 24 when it is removed from the supply unit 25 will be explained.

[0112] When the liquid reservoir 24 is removed from the mounting part 28, the rear end of the liquid reservoir 24 ( Figure 4 The support member 90 (right end) is lifted upwards against the force of the second force-applying component 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 of the first force-applying component 83.

[0113] As the support member 90 rotates from the connecting position to the guiding position, the outlet 30 disengages from the liquid inlet 60, and the positioning protrusion 248 is pulled out from the positioning hole 448. 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 of the fourth force-applying member 274. At this time, the liquid reservoir 24 is guided by the first guide 247a and the second guide 247b, so the connecting terminal 521 does not twist and quickly disengages from the electrical connection 721. Simultaneously, the release part 241 separates from the first arm 95, and the locking lever 92, which is forceped by the third force-applying member 99, returns to the locked position.

[0114] Subsequently, when the operator pulls the liquid reservoir 24 toward the outside of 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 does not contact the liquid inlet 60 and moves horizontally along the Y-axis.

[0115] G. Control method for liquid ejection device

[0116] Reference Figures 11-17 The flowchart shown illustrates the control method for the liquid ejection device 11. Here, the sequence of steps in each control method can be arbitrarily changed without departing from the purpose of each control method.

[0117] Figure 11 The liquid filling routine shown can also be performed when the liquid reservoir 24 is initially installed in the mounting section 28. The liquid filling routine can also be performed after the liquid nozzle 23 has been replaced, when the liquid reservoir 24 is installed in the mounting section 28. In the initial state, all selector valves of the supply valve 38, circulation valve 40, and switching mechanism 48 are closed.

[0118] In step S101, control unit 19 opens the second storage unit 35 to the atmosphere. In step S102, control unit 19 opens the first storage unit 33 to the atmosphere. In step S103, control unit 19 determines whether the first liquid level 66 is at a standard position. If the first liquid level 66 is not at a standard position, step S103 becomes "NO", and control unit 19 waits until the first liquid level 66 is at a standard position. When the first liquid level 66 is at a standard position, step S103 becomes "YES", and control unit 19 transfers the process to step S104.

[0119] In step S104, control unit 19 opens supply valve 38. In step S105, control unit 19 opens circulation valve 40. In step S106, control unit 19 pressurizes the second storage unit 35.

[0120] In step S107, the control unit 19 determines whether the first liquid level 66 is in the full position. If the first liquid level 66 is not in the full position, step S107 becomes "No", and the control unit 19 waits until the first liquid level 66 is in the full position. When the first liquid level 66 is in the full position, step S107 becomes "Yes", and the control unit 19 transfers the process to step S108.

[0121] In step S108, control unit 19 closes circulation valve 40. In step S109, control unit 19 determines whether a filling time has elapsed since closing circulation valve 40. Filling time refers to the time required for liquid to be filled from supply flow path 37 to nozzle 22. If no filling time has elapsed, step S109 becomes "No," and control unit 19 remains on standby until the filling time has elapsed. When the filling time has elapsed, step S109 becomes "Yes," and control unit 19 transfers the process to step S110. In step S110, control unit 19 stops driving pressurizing unit 47. In step S111, control unit 19 opens second storage unit 35 to the atmosphere, ending the liquid filling routine.

[0122] Here, steps S104 and S105 can be performed simultaneously with or after step S106. Similarly, step S110 can be performed simultaneously with or after step S111.

[0123] Next, we will explain its effect in the case of liquid filling.

[0124] When the liquid reservoir 24 is installed in the mounting section 28 and the first storage section 33 is open to the atmosphere, liquid is supplied from the liquid reservoir 24 to the first storage section 33. At this time, since the second storage section 35 is also open to the atmosphere, the liquid supplied to the first storage section 33 also flows into the second storage section 35. The first liquid level 66 and the second liquid level 70 rise to the standard position.

[0125] When the liquid level sensor 63 detects that the first liquid level 66 is at the standard position, the control unit 19 opens the supply valve 38 and the circulation valve 40, and drives the pressurization unit 47. The check valve 36 closes when the pressure in the second storage unit 35 is higher than the pressure in the first storage unit 33, thus sealing the communication passage 34. Therefore, the liquid in the second storage unit 35 flows into the first storage unit 33 via the supply flow passage 37, the liquid nozzle 23, and the recovery flow passage 39.

[0126] When the liquid level sensor 63 detects that the first liquid level 66 is at the full position, the control unit 19 closes the circulation valve 40. This stops the flow of liquid into the first storage unit 33. The liquid in the second storage unit 35 is then filled into the liquid nozzle 23 and discharged from the nozzle 22.

[0127] When liquid is filled into the liquid nozzle 23, the control unit 19 opens the second storage section 35 to the atmosphere. This opens the one-way valve 36, opening the communication passage 34. Liquid in the first storage section 33 is supplied to the second storage section 35 via the communication passage 34. The control unit 19 can also close the supply valve 38.

[0128] Figure 12The liquid circulation routine shown can also be executed at the time indicated for liquid circulation. For example, liquid circulation can be indicated for execution during standby when printing is not performed, after liquid filling. The control unit 19 can also execute the liquid circulation routine periodically.

[0129] In step S201, control unit 19 opens supply valve 38. In step S202, control unit 19 opens circulation valve 40. In step S203, control unit 19 opens first storage unit 33 to the atmosphere. In step S204, control unit 19 pressurizes second storage unit 35.

[0130] In step S205, the control unit 19 determines whether the first liquid level 66 is in the full position. If the first liquid level 66 is not in the full position, step S205 becomes "No," and the control unit 19 waits until the first liquid level 66 is in the full position. When the first liquid level 66 is in the full position, step S205 becomes "Yes," and the control unit 19 transfers the process to step S206. In step S206, the control unit 19 closes the supply valve 38. In step S207, the control unit 19 opens the second storage unit 35 to the atmosphere, ending the liquid circulation routine.

[0131] Here, steps S201 and S202 can be performed simultaneously with or after step S203, or simultaneously with or after step S204. Similarly, step S206 can be performed simultaneously with or after step S207.

[0132] Next, the function of liquid circulation will be explained.

[0133] Control unit 19 opens supply valve 38, thereby opening supply flow path 37. Control unit 19 also opens circulation valve 40, thereby opening recovery flow path 39.

[0134] The liquid dispensing device 11 pressurizes the second storage section 35 using the pressurizing unit 47, causing liquid to flow from the second storage section 35 through the liquid nozzle 23 to the first storage section 33. At this time, the pressure in the second storage section 35 is higher than the pressure in the first storage section 33. Therefore, the one-way valve 36 closes. That is, the liquid dispensing device 11 pressurizes the second storage section 35, thereby closing the communication path 34 through the one-way valve 36.

[0135] Figure 13 The printing routine shown can also be executed at the specified time for printing.

[0136] In step S301, control unit 19 opens the first storage unit 33 to the atmosphere. In step S302, control unit 19 opens the second storage unit 35 to the atmosphere. In step S303, control unit 19 opens the supply valve 38.

[0137] In step S304, the control unit 19 determines whether the ejection flow rate of the liquid generated by the liquid ejected from the nozzle 22 during printing is above a threshold. The control unit 19 may also calculate the ejection flow rate based on printing data. If the ejection flow rate is above the threshold, step S304 becomes "yes", and the control unit 19 transfers the process to step S305. In step S305, the control unit 19 opens the circulation valve 40.

[0138] In step S304, if the ejection flow rate is less than the threshold, step S304 becomes "No", and control unit 19 transfers the process to step S306. In step S306, control unit 19 closes circulation valve 40. In step S307, control unit 19 initiates printing, ending the printing routine.

[0139] Here, steps S301 and S302 can be performed simultaneously with or after step S303, or simultaneously with or after step S305, or simultaneously with or after step S306.

[0140] Next, the function of executing the printing routine will be explained.

[0141] If the flow rate of liquid ejected from the liquid nozzle 23 onto the medium 12 is less than a threshold, the control unit 19 opens the supply valve 38 and closes the circulation valve 40. That is, the control unit 19 opens the supply flow path 37 through the supply valve 38 and performs printing while closing the recovery flow path 39 using the circulation valve 40. Therefore, liquid is supplied from the second storage unit 35 to the liquid nozzle 23 via the supply flow path 37.

[0142] When the flow rate of liquid ejected from the liquid nozzle 23 onto the medium 12 exceeds a threshold, the control unit 19 opens the supply valve 38 and the circulation valve 40. That is, the control unit 19 opens the supply flow path 37 via the supply valve 38 and performs printing with the recovery flow path 39 open via the circulation valve 40. Therefore, liquid is supplied from the second storage unit 35 to the liquid nozzle 23 via the supply flow path 37, and liquid is supplied from the first storage unit 33 via the recovery flow path 39.

[0143] Figure 14 The pressurized discharge routine shown is executed when pressurized discharge is instructed to be performed, or when a poor discharge occurs, such as when liquid cannot be properly ejected from nozzle 22.

[0144] In step S401, control unit 19 opens supply valve 38. In step S402, control unit 19 closes circulation valve 40. In step S403, control unit 19 pressurizes the second storage compartment 35. In step S404, control unit 19 determines whether a pressurization discharge time has elapsed since pressurizing the second storage compartment 35. The pressurization discharge time is the time required for the pressure applied to the second storage compartment 35 to be transmitted to nozzle 22 via supply flow path 37 and for liquid to be discharged from nozzle 22, allowing nozzle 22 to return to its original state.

[0145] Before the pressurization discharge time has elapsed, step S404 becomes "No," and control unit 19 remains on standby until the pressurization discharge time has elapsed. When the pressurization discharge time has elapsed, step S404 becomes "Yes," and control unit 19 transfers the process to step S405. In step S405, control unit 19 closes supply valve 38. In step S406, control unit 19 opens second storage unit 35 to the atmosphere, ending the pressurization discharge routine.

[0146] Here, steps S401 and S402 can be performed simultaneously with or after step S403. Similarly, step S405 can be performed simultaneously with or after step S406.

[0147] Next, the effect of pressurized discharge will be explained.

[0148] The liquid ejection device 11 pressurizes the second storage section 35 through the pressurizing section 47 and discharges liquid from the nozzle 22. At this time, since the pressure in the second storage section 35 is higher than the pressure in the first storage section 33, the one-way valve 36 closes. That is, the liquid ejection device 11 closes the communication path 34 through the one-way valve 36 by pressurizing the second storage section 35.

[0149] When the pressurization period has elapsed after pressurization of the second storage section 35, the control unit 19 closes the supply valve 38. This stops the discharge of liquid from the nozzle 22. When the second storage section 35 is open to the atmosphere, the check valve 36 opens, supplying liquid from the first storage section 33 to the second storage section 35.

[0150] Figure 15 The accumulator discharge routine shown can also be executed in situations where accumulator discharge is instructed to be performed, or where poor ejection does not improve even if pressurized discharge is performed.

[0151] In step S501, control unit 19 closes supply valve 38. In step S502, control unit 19 closes circulation valve 40. In step S503, control unit 19 determines whether it instructs to perform a first accumulator discharge or a second accumulator discharge, where the pressure accumulated in the second accumulator discharge is lower than that in the first accumulator discharge. If the first accumulator discharge is performed, step S503 becomes "yes," and control unit 19 transfers the process to step S504. In step S504, control unit 19 sets the accumulator time to a first time.

[0152] In step S503, if the second accumulator discharge is performed, step S503 becomes "No", and the control unit 19 transfers the process to step S505. In step S505, the control unit 19 sets the accumulator time to a second time that is shorter than the first time.

[0153] In step S506, the control unit 19 pressurizes the second storage unit 35. In step S507, the control unit 19 determines whether a pressure build-up time has elapsed since the pressurization of the second storage unit 35 began. If the pressure build-up time has not elapsed, step S507 becomes "No," and the control unit 19 remains on standby until the pressure build-up time has elapsed. When the pressure build-up time has elapsed, step S507 becomes "Yes," and the control unit 19 transfers the processing to step S508.

[0154] In step S508, the control unit 19 opens the supply valve 38. In step S509, the control unit 19 determines whether a pressure accumulating and discharging time has elapsed since the supply valve 38 was opened. The pressure accumulating and discharging time is the time required for the pressure accumulated in the second storage unit 35 to be transmitted to the nozzle 22 via the supply flow path 37 and for liquid to be discharged from the nozzle 22.

[0155] Before the pressure accumulating and discharging time has elapsed, step S509 becomes "No," and control unit 19 remains on standby until the pressure accumulating and discharging time has elapsed. When the pressure accumulating and discharging time has elapsed, step S509 becomes "Yes," and control unit 19 transfers the process to step S510. In step S510, control unit 19 closes supply valve 38. In step S511, control unit 19 opens the second storage unit 35 to the atmosphere, ending the pressure accumulating and discharging routine.

[0156] Here, steps S501 and S502 can be performed simultaneously with the start of pressurization in step S506 or immediately after the start of pressurization in step S506, respectively. Additionally, step S510 can be performed simultaneously with step S511 or after step S511. Alternatively, step S510 can be omitted.

[0157] Next, we will explain its function in the case of pressure accumulator discharge.

[0158] The control unit 19 closes the supply valve 38, thereby sealing the supply flow path 37. The liquid ejection device 11 pressurizes the second storage section 35 via the pressurization unit 47. At this time, the pressure in the second storage section 35 is higher than the pressure in the first storage section 33, therefore the check valve 36 closes. That is, the liquid ejection device 11 seals the communication path 34 via the check valve 36 by pressurizing the second storage section 35.

[0159] After pressurizing the second storage section 35 by the pressurizing unit 47, the liquid discharge device 11 opens the supply flow path 37 through the supply valve 38 to discharge liquid from the nozzle 22. The pressure accumulated in the second storage section 35 is proportional to the time of pressurization of the second storage section 35 with the connecting passage 34 and the supply flow path 37 closed. In the first pressurization discharge, the time of pressurization of the second storage section 35 by the pressurizing unit 47 is a first time. In the second pressurization discharge, the time of pressurization of the second storage section 35 by the pressurizing unit 47 is a second time shorter than the first time. The pressure accumulated in the first pressurization discharge is greater than the pressure accumulated in the second pressurization discharge. That is, in the first pressurization discharge, the supply flow path 37 is opened by the supply valve 38 when the second storage section 35 is pressurized by the first pressure. In the second pressurization discharge, the supply flow path 37 is opened by the supply valve 38 when the second storage section 35 is pressurized by the second pressure, which is lower than the first pressure.

[0160] When the pressure storage time has elapsed after pressurizing the second storage section 35, the control unit 19 closes the supply valve 38. This stops the discharge of liquid from the nozzle 22. When the second storage section 35 is open to the atmosphere, the check valve 36 opens, supplying liquid from the first storage section 33 to the second storage section 35.

[0161] Figure 16 The micro-pressure discharge routine shown can also be executed if micro-pressure discharge is specified.

[0162] In step S601, control unit 19 opens supply valve 38. In step S602, control unit 19 opens circulation valve 40. In step S603, control unit 19 depressurizes air chamber 53. In step S604, control unit 19 determines whether a depressurization time has elapsed since depressurizing air chamber 53. The depressurization time is the time required for the flexible member 42 to deform and maximize the volume of liquid chamber 41.

[0163] Before the decompression time has elapsed, step S604 becomes "No," and control unit 19 remains on standby until the decompression time has elapsed. When the decompression time has elapsed, step S604 becomes "Yes," and control unit 19 transfers the process to step S605. In step S605, control unit 19 closes supply valve 38. In step S606, control unit 19 closes circulation valve 40. In step S607, control unit 19 pressurizes air chamber 53.

[0164] In step S608, the control unit 19 determines whether a micro-pressurization time has elapsed after pressurizing the air chamber 53. The micro-pressurization time is the time required for the pressure of the pressurized air chamber 53 to be transmitted to the nozzle 22 via the liquid chamber 41 and the recovery flow path 39.

[0165] Before the micro-pressurization time has elapsed, step S608 becomes "No," and control unit 19 remains on standby until the micro-pressurization time has elapsed. When the micro-pressurization time has elapsed, step S608 becomes "Yes," and control unit 19 transfers the processing to step S609. In step S609, control unit 19 opens air chamber 53 to the atmosphere, ending the micro-pressurization discharge routine.

[0166] Here, steps S601 and S602 can be performed simultaneously with or after step S603. Additionally, steps S605 and S606 can be performed during step S603, simultaneously with the end of step S603, or after the end of step S603. Furthermore, steps S605 and S606 can also be performed simultaneously with or after step S607.

[0167] Next, the effect of micro-pressurization discharge will be explained.

[0168] The control unit 19 opens the supply flow path 37 and the recovery flow path 39 by opening the supply valve 38 and the circulation valve 40. The control unit 19 depressurizes the air chamber 53, causing the flexible member 42 to deform and increase the volume of the liquid chamber 41. Liquid flows into the liquid chamber 41 from the first storage unit 33 via the recovery flow path 39, and liquid also flows into the liquid chamber 41 from the second storage unit 35 via the supply flow path 37 and the recovery flow path 39.

[0169] When the volume of the liquid chamber 41 reaches its maximum, the control unit 19 closes the supply valve 38, thereby sealing the supply flow path 37. The control unit 19 also closes the circulation valve 40, sealing the recovery flow path 39. In this state, the liquid ejection device 11 pressurizes the flexible member 42 by supplying pressurized air to the air chamber 53 using the pressurizing unit 47. That is, the liquid ejection device 11 pressurizes the flexible member 42 via the pressurizing mechanism 57 to discharge liquid from the nozzle 22. The pressurizing mechanism 57 pressurizes the liquid chamber 41 with a pressure that disrupts the curved surface formed on the nozzle 22. The amount of liquid discharged from the liquid nozzle 23 via micro-pressurization is less than the amount of liquid discharged from the liquid nozzle 23 via pressurization.

[0170] Figure 17 The head replacement routine shown can also be executed when replacing liquid nozzle 23.

[0171] In step S701, the control unit 19 determines whether the liquid container 24 has been removed from the mounting unit 28. If the liquid container 24 is mounted on the mounting unit 28, step S701 becomes "No," and the control unit 19 remains on standby until the liquid container 24 is removed. When the liquid container 24 is removed, step S701 becomes "Yes," and the control unit 19 transfers the processing to step S702.

[0172] In step S702, control unit 19 opens supply valve 38. In step S703, control unit 19 closes circulation valve 40. In step S704, control unit 19 pressurizes the second storage unit 35. In step S705, control unit 19 determines whether a first discharge time has elapsed since pressurizing the second storage unit 35. The first discharge time is the time required for the liquid stored in the second storage unit 35 to be discharged through supply flow path 37 and liquid nozzle 23.

[0173] Before the first discharge time has elapsed, step S705 becomes "No", and control unit 19 remains on standby until the first discharge time has elapsed. When the first discharge time has elapsed, step S705 becomes "Yes", and control unit 19 transfers the process to step S706. In step S706, control unit 19 opens circulation valve 40.

[0174] In step S707, the control unit 19 determines whether a second discharge time has elapsed since the circulation valve 40 was opened. The second discharge time is the time required to recover the liquid in the recovery flow path 39 to the first storage unit 33.

[0175] Before the second discharge time has elapsed, step S707 becomes "No," and control unit 19 remains on standby until the second discharge time has elapsed. When the second discharge time has elapsed, step S707 becomes "Yes," and control unit 19 transfers the process to step S708. In step S708, control unit 19 closes supply valve 38. In step S709, control unit 19 closes circulation valve 40.

[0176] In step S710, the control unit 19 opens the second storage unit 35 to the atmosphere. In step S711, the control unit 19 determines whether the liquid nozzle 23 has been replaced. If the liquid nozzle 23 has not been replaced, step S711 becomes "No," and the control unit 19 remains on standby until the liquid nozzle 23 is replaced. When the liquid nozzle 23 is replaced, step S711 becomes "Yes," and the control unit 19 ends the nozzle replacement routine.

[0177] Here, steps S702 and S703 can be performed simultaneously with the start of pressurization in step S704 or immediately after the start of pressurization in step S704. Similarly, steps S708 and S709 can be performed simultaneously with or after step S710.

[0178] Next, the head replacement routine will be explained.

[0179] When replacing the liquid nozzle 23, the operator performs the nozzle replacement procedure and removes the liquid collection body 24 from the mounting section 28. Next, the control unit 19 opens the supply valve 38, opening the supply flow path 37. The control unit 19 then closes the circulation valve 40, sealing the recovery flow path 39. In this state, the control unit 19 pressurizes the second storage section 35.

[0180] Specifically, the liquid dispensing device 11 pressurizes the second storage section 35 via the pressurizing section 47, thereby discharging the liquid from the second storage section 35 to the liquid nozzle 23 from the nozzle 22. At this time, the pressure in the second storage section 35 is higher than the pressure in the first storage section 33, therefore the one-way valve 36 closes. That is, the liquid dispensing device 11 closes the communication path 34 via the one-way valve 36 by pressurizing the second storage section 35.

[0181] When the liquid in the second storage section 35, the supply flow path 37, and the liquid nozzle 23 is discharged, the control unit 19 opens the circulation valve 40, thereby opening the recovery flow path 39. That is, the liquid dispensing device 11 pressurizes the second storage section 35 through the pressurizing unit 47, thereby recovering the liquid in the recovery flow path 39 back to the first storage section 33. The operator replaces the liquid nozzle 23 while the liquid has been discharged from the supply flow path 37, the liquid nozzle 23, and the recovery flow path 39.

[0182] Next, the function of the liquid ejection device 11 and its control method will be explained.

[0183] The second storage section 35 is connected to a connecting passage 34 that communicates with the first storage section 33 and a supply flow passage 37 that communicates with the liquid nozzle 23. The connecting passage 34 can be closed by a one-way valve 36 when the pressurizing section 47 pressurizes the second storage section 35. Therefore, the liquid in the pressurized second storage section 35 is supplied to the liquid nozzle 23 via the supply flow passage 37. Thus, the liquid dispensing device 11 can discharge liquid from the nozzle 22 by pressurizing the liquid in the liquid nozzle 23. Therefore, nozzle detachment due to liquid being introduced from the nozzle 22 by the liquid nozzle 23, i.e., poor dispensing, is less likely to occur.

[0184] When the one-way valve 36 closes the connecting passage 34 and the supply valve 38 closes the supply flow passage 37, the pressurizing unit 47 pressurizes the second storage section 35, accumulating pressurized pressure in the second storage section 35. Therefore, by opening the supply valve 38 when the pressure in the second storage section 35 is increased, high pressure can be transmitted to the liquid nozzle 23, for example, to easily discharge thickened liquids.

[0185] When the pressurizing unit 47 pressurizes the second storage section 35 with the circulation valve 40 closed and the recovery flow path 39 closed, liquid is discharged from the liquid nozzle 23. When the pressurizing unit 47 pressurizes the second storage section 35 with the circulation valve 40 open and the recovery flow path 39 open, the liquid in the liquid nozzle 23 is recovered to the first storage section 33 through the recovery flow path 39. Therefore, maintenance can be selected and performed based on factors such as the state of the air bubbles in the supply flow path 37 and the state of the nozzle 22.

[0186] When the pressurizing mechanism 57 pressurizes the liquid chamber 41 with the circulation valve 40 closing the recovery flow path 39, liquid is discharged from the liquid nozzle 23. The amount of liquid discharged at this time is determined by the size of the liquid chamber 41. Therefore, compared with the case where the second storage section 35 is pressurized by the pressurizing unit 47, it is possible to apply micro-pressure to the liquid nozzle 23 with high precision, which is sufficient to disrupt the curved liquid surface formed on the nozzle 22.

[0187] The pressurizing mechanism 57 includes a pressurizing section 47 that pressurizes the second storage section 35. The pressurizing section 47 pressurizes the liquid chamber 41 by pressing the flexible member 42 through the air chamber 53 via the air flow path 55. Therefore, the liquid in the second storage section 35 and the liquid in the liquid chamber 41 can be pressurized by the pressurizing section 47.

[0188] The first connection portion 44, which connects to the recovery flow path 39, is positioned higher than the second connection portion 45, which connects to the supply flow path 37. Since air bubbles within the liquid nozzle 23 tend to accumulate at higher positions due to buoyancy, they are more likely to accumulate at the first connection portion 44 than at the second connection portion 45. Therefore, by recovering the liquid within the liquid nozzle 23 to the first storage portion 33 via the recovery flow path 39, air bubbles can be easily discharged from the liquid nozzle 23.

[0189] For example, when the check valve 36 is actuated to close the communication path 34, a drive source for actuating the check valve 36 is required. In this regard, the check valve 36 incorporates a check valve. Specifically, the check valve 36 allows the flow of liquid supplied from the first reservoir 33 to the second reservoir 35 due to a water level difference, while restricting the flow of liquid from the second reservoir 35 to the first reservoir 33 when pressurized within the second reservoir 35. Therefore, the check valve 36 does not require actuation, reducing the need for a drive source.

[0190] The nozzle surface 21 of the liquid nozzle 23 is inclined relative to the horizontal. Therefore, the configuration freedom of the liquid nozzle 23 can be increased.

[0191] Pressurized discharge is achieved by closing the connecting passage 34 through the one-way valve 36 and pressurizing the second storage section 35 through the pressurizing section 47. The liquid in the pressurized second storage section 35 is supplied to the liquid nozzle 23 via the supply flow path 37. Therefore, the liquid dispensing device 11 can discharge liquid from the nozzle 22 by pressurizing the liquid in the liquid nozzle 23, thereby reducing the possibility of liquid being introduced into the liquid nozzle 23 from the nozzle 22.

[0192] During the accumulating discharge, the one-way valve 36 closes the connecting passage 34, and with the supply valve 38 closing the supply flow passage 37, the pressurizing section 47 pressurizes the second storage section 35, thereby accumulating pressure in the second storage section 35. During the accumulating discharge, after pressurizing the second storage section 35, the supply valve 38 is opened, so the accumulated high pressure can be transmitted to the liquid nozzle 23, for example, making it easy to discharge thickened liquids.

[0193] In the first accumulator discharge, when the second reservoir 35 is pressurized by a first pressure, the supply flow path 37 is opened through the supply valve 38, and liquid is discharged from the nozzle 22. In the second accumulator discharge, when the second reservoir 35 is pressurized by a second pressure lower than the first pressure, the supply flow path 37 is opened through the supply valve 38, and liquid is discharged from the nozzle 22. Therefore, by combining the first and second accumulator discharges in conjunction with the configuration of the supply flow path 37, for example, liquid can be efficiently filled into the supply flow path 37.

[0194] In the operation of the pressurizing unit 47 with the connecting passage 34 and the supply flow passage 37 closed, the longer the operation time, the higher the accumulated pressure. In this respect, in the first pressurization discharge, after pressurizing the second storage unit 35 for a first time, the supply flow passage 37 is opened via the supply valve 38, and liquid is discharged from the nozzle 22. In the second pressurization discharge, after pressurizing the second storage unit 35 for a second time shorter than the first time, the supply flow passage 37 is opened via the supply valve 38, and liquid is discharged from the nozzle 22. Therefore, by combining the first and second pressurization discharges in conjunction with the configuration of the supply flow passage 37, for example, liquid can be efficiently filled into the supply flow passage 37.

[0195] During liquid circulation, liquid is recovered from the second storage unit 35 to the first storage unit 33 via the supply flow path 37, the liquid nozzle 23, and the recovery flow path 39. Air bubbles within the supply flow path 37 and the liquid nozzle 23 move along with the liquid. Therefore, air bubbles can be recovered without discharging liquid from the liquid nozzle 23.

[0196] In the micro-pressurized discharge, the supply valve 38 closes the supply flow path 37, and the circulation valve 40 closes the recovery flow path 39. The pressurizing mechanism 57 pressurizes the flexible member 42, thereby pressurizing the liquid in the liquid chamber 41 and causing it to be discharged from the liquid nozzle 23. The amount of liquid discharged at this time is determined by the size of the liquid chamber 41. Therefore, compared to pressurizing the second storage section 35 using the pressurizing section 47, it is possible to apply micro-pressure to the liquid nozzle 23 with high precision, sufficient to disrupt the curved surface formed on the nozzle 22.

[0197] During micro-pressurization discharge, the pressurizing unit 47 pressurizes the air chamber 53 and the flexible member 42 via the air flow path 55. Therefore, the liquid in the second storage section 35 and the liquid in the liquid chamber 41 can be pressurized by the pressurizing unit 47.

[0198] The head replacement routine involves pressurizing the second storage section 35 with the connecting passage 34 and the recovery flow passage 39 closed and the supply flow passage 37 open, thereby discharging the liquid in the second storage section 35, the supply flow passage 37, and the liquid nozzle 23 from the nozzle 22. Then, the connecting passage 34 is closed, and the second storage section 35 is pressurized with the recovery flow passage 39 and the supply flow passage 37 open, thereby recovering the liquid in the recovery flow passage 39 back to the first storage section 33. Therefore, the replacement of the liquid nozzle 23 is performed while the liquid is discharged from the supply flow passage 37, the liquid nozzle 23, and the recovery flow passage 39, thus preventing liquid from dripping from these pathways.

[0199] When the flow rate of liquid ejected from medium 12 is above a threshold, the supply flow path 37 and the recovery flow path 39 are opened. In the liquid nozzle 23, in addition to the supply flow path 37, liquid is also supplied from the recovery flow path 39, so the required amount of liquid can be easily supplied.

[0200] H. Other implementation methods

[0201] This embodiment can be implemented with modifications as follows. This embodiment and the following modifications can be combined with each other within the scope of technical inconsistency.

[0202] The liquid dispensing device 11 may also include a wiping component (not shown) for wiping the nozzle surface 21. The liquid dispensing device 11 may also wipe the nozzle surface 21 with the wiping component after liquid has been discharged from the nozzle 22. The liquid dispensing device 11 may also wipe the nozzle surface 21 before the operator removes the liquid nozzle 23.

[0203] The control unit 19 can also control the opening and closing of the check valve 36. The control unit 19 can also close the connecting passage 34 via the check valve 36 before pressurizing the second storage unit 35.

[0204] The second pressure discharge can also be carried out as follows: with the check valve 36 and the supply valve 38 closed, the second storage section 35 is pressurized for a first time to make the pressure in the second storage section 35 a first pressure, then the check valve 36 is opened to reduce the pressure in the second storage section 35 to a second pressure, and then the supply valve 38 is opened.

[0205] Micro-pressurized discharge can also be achieved by pressurizing the liquid in the liquid chamber 41 using a spring 54 to press the flexible member 42. In this case, after the control unit 19 depressurizes the air chamber 53 to increase the volume of the liquid chamber 41, it opens the air chamber 53 to the atmosphere. When the air chamber 53 reaches atmospheric pressure, the spring 54 presses the liquid in the liquid chamber 41, causing the liquid to be discharged from the liquid nozzle 23. In the configuration where the flexible member 42 is pressed by the spring 54, the spring 54 is included in the pressurization mechanism 57.

[0206] The liquid ejection device 11 can also perform printing with the recovery flow path 39 open via the circulation valve 40, regardless of the ejection flow rate.

[0207] The liquid nozzle 23 may also have multiple pressure chambers communicating with multiple nozzles 22, a common liquid chamber communicating with the multiple pressure chambers, and a filter chamber for housing the filter. The first connecting portion 44 and the second connecting portion 45 are connected to at least one of the pressure chamber, the common liquid chamber, and the filter chamber. For example, when the first connecting portion 44 and the second connecting portion 45 are connected to the filter chamber, the liquid dispensing device 11 can recover the air bubbles captured by the filter along with the liquid to the first storage unit 33 by performing liquid circulation. The liquid dispensing device 11 can also perform liquid circulation when air bubbles are generated within the liquid nozzle 23.

[0208] The supply valve 38 and circulation valve 40 can also be closed when the liquid dispensing device 11 is in standby mode or when the power is off, thus sealing the supply flow path 37 and the recovery flow path 39. By sealing the supply flow path 37 and the recovery flow path 39, the possibility of liquid leakage from the liquid nozzle 23 can be reduced, for example, even if vibration or impact is applied to the liquid dispensing device 11.

[0209] The amount of liquid that the second storage section 35 can store may be less than the amount of liquid required for pressurization and discharge. In this case, the control section 19 may also alternately pressurize the second storage section 35 to supply liquid from the second storage section 35 to the liquid nozzle 23, and open the second storage section 35 to the atmosphere to supply liquid from the first storage section 33 to the second storage section 35.

[0210] The liquid level sensor 63 can also detect that the first liquid level 66 is at an end position lower than the standard position. The control unit 19 can also notify the first storage unit 33 that it is empty when the liquid level sensor 63 detects that the first liquid level 66 is at the end position. When the first liquid level 66 and the second liquid level 70 are at the end position, if the combined volume of liquid stored in the first storage unit 33 and the second storage unit 35 exceeds the amount of liquid required for printing on one medium 12, printing on one medium 12 can be completed at the end position.

[0211] The amount of liquid contained in the liquid reservoir 24 may be less than the amount of liquid that the supply unit 25 can hold. In this case, the liquid reservoir 24 may be replaced midway through the liquid filling process of filling the supply unit 25 with liquid.

[0212] The accumulated pressure can also be discharged by closing the connecting passage 34 through the one-way valve 36. After pressurizing the second storage section 35 with the supply flow path 37 closed by the supply valve 38, the supply flow path 37 is opened through the supply valve 38 when the pressure sensor 49 is detected to have reached a predetermined pressure. At this time, the control unit 19 can also perform a first accumulated pressure discharge by opening the supply flow path 37 when the pressure sensor 49 is detected to have reached a first pressure, and a second accumulated pressure discharge by opening the supply flow path 37 when the pressure sensor is detected to have reached a second pressure lower than the first pressure. The first pressure and the second pressure are greater than the pressurization pressure applied to the second storage section 35 during pressurized discharge.

[0213] The control unit 19 can also depressurize the first storage unit 33 when the liquid flows from the recovery flow path 39 into the first storage unit 33. For example, the atmospheric opening path 50 can also be connected to the air flow path 55. Alternatively, the pressurization unit 47 can be driven to pressurize the second storage unit 35 and depressurize the first storage unit 33 via the air flow path 55 and the atmospheric opening path 50.

[0214] The control unit 19 can also remove bubbles from the liquid by depressurizing the first storage unit 33, causing the bubbles contained in the liquid stored in the first storage unit 33 to expand.

[0215] Liquid filling, pressurized discharge, micro-pressurized discharge, and liquid circulation can be performed multiple times or in combination. When the amount of liquid that can be stored in the first storage section 33 is less than the amount of liquid filled into the supply flow path 37, the recovery flow path 39, and the liquid nozzle 23, liquid can be filled into the supply flow path 37, the recovery flow path 39, and the liquid nozzle 23 by performing multiple liquid filling operations. For example, micro-pressurized discharge can be performed after liquid filling. By combining liquid filling and micro-pressurized discharge, the occurrence of poor spraying can be reduced compared to performing liquid filling alone.

[0216] The first storage section 33 and the second storage section 35 can also be constructed as a single unit.

[0217] The flexible component 42 can also be formed of rubber membrane, elastomer membrane, film, etc.

[0218] Liquid chamber 41 can also be provided in supply flow path 37. Pressurization mechanism 57 can also pressurize the liquid chamber provided in supply flow path 37.

[0219] The pressurization unit 47 can also use a diaphragm pump, piston pump, or gear pump.

[0220] The liquid inlet 60 and outlet 30 may also have multiple flow paths. For example, one flow path may allow liquid to flow from the liquid reservoir 24 into the first storage section 33, while other flow paths may allow air to flow from the first storage section 33 into the liquid reservoir 24.

[0221] The liquid nozzle 23 can also spray liquid onto the medium 12 in a horizontal position with the nozzle surface 21 horizontal. The liquid nozzle 23 can also be configured to change its position between a horizontal position and an inclined position.

[0222] The liquid ejection device 11 may also have an atmospheric opening path that allows the second storage section 35 to be opened to the atmosphere, unlike the pressurized flow path 51.

[0223] exist Figure 17 In the head replacement routine shown, the control unit 19 can also execute steps S702 to S705 again after executing step S710. As a result, the liquid recovered in the first storage unit 33 can be discharged from the liquid nozzle 23.

[0224] The liquid ejection device 11 can also be a liquid ejection device that sprays or ejects liquids other than ink. The state of the liquid ejected from the liquid ejection device as tiny droplets also includes a tailing-like, tear-like, or filamentous state. The liquid referred to here can be any material that can be ejected from the liquid ejection device. For example, the liquid can be any state in which the substance is in a liquid phase, including liquids with high or low viscosity, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and molten metals. Liquids not only include liquids as a state of matter, but also liquids in which functional material particles composed of solids such as pigments or metal particles are dissolved, dispersed, or mixed in a solvent. Representative examples of liquids include inks and liquid crystals described in the above embodiments. Here, inks include general water-based inks, oil-based inks, and various liquid compositions such as gel inks and hot-melt inks. Specific examples of liquid ejection devices include those that eject liquids containing, in dispersed or dissolved form, materials such as electrode materials and pigments used in the manufacture of liquid crystal displays, electroluminescent displays, surface-emitting displays, and color filters. Liquid ejection devices can also be devices for ejecting biological organic matter used in the manufacture of biochips, devices used as precision pipettes to eject liquids as samples, dyeing and printing devices, and micro-dispensers. Liquid ejection devices can also be devices for ejecting lubricating oil through protrusions in precision machinery such as watches or cameras, and devices for ejecting transparent resin liquids such as UV-curable resins onto substrates using micro-hemispherical lenses or optical lenses used in optical communication components. Liquid ejection devices can also be devices for ejecting etching solutions such as acids or alkalis to etch substrates.

[0225] I. Effects of this disclosure

[0226] The following describes the technical aspects and effects of this disclosure as understood based on the above-described embodiments and modifications.

[0227] (1) The supply unit is configured to receive one or more liquid reservoirs and be installed in a detachable manner. The supply unit includes: a support member extending along a guide path intersecting a vertical line and having a front end region where the beginning of the guide path is located and a base end region where the end of the guide path is located; a rotation shaft having an axis intersecting both the vertical line and the guide path and disposed in the base end region; and a liquid inlet portion disposed below the support member and configured to be connected to the liquid reservoir. The support member is configured to rotate about the rotation shaft between a guide position that guides the one or more liquid reservoirs along the guide path and a connection position where the one or more liquid reservoirs are connected to the liquid inlet portion.

[0228] With this configuration, after the liquid reservoir is horizontally inserted into the front of the supply unit, it can be connected to the liquid inlet by rotating the liquid reservoir and the support member downwards. This allows for easy loading and unloading of the liquid reservoir from the front of the supply unit, thus improving operability.

[0229] (2) Alternatively, in the above-mentioned supply unit, the support member has one or more guide portions for guiding the liquid reservoir.

[0230] Based on this configuration, the movement of the liquid reservoir can be guided by the guide section, thus ensuring good operability.

[0231] (3) Alternatively, the supply unit may also include: a first force-applying component that applies force to the support component from the connection position toward the guide position.

[0232] According to this configuration, the support member can be rotated toward the guide position by the force of the first force-applying member.

[0233] (4) Alternatively, the supply unit may further include: a locking rod configured to engage with the liquid reservoir supported by the support member when the support member is in the connection position; and a second force-applying member to apply force to the locking rod toward the support member.

[0234] According to this configuration, by applying force to the engaging rod that engages with the liquid container by the second force-applying component, the liquid container can be held in the connected position.

[0235] (5) In the above-mentioned supply unit, the engaging rod has an inclined surface that engages with the liquid reservoir supported by the supporting member when the supporting member rotates from the connection position toward the guide position.

[0236] According to this configuration, when the support member rotates from the connection position to the guide position, the liquid reservoir can move smoothly along the inclined surface.

[0237] (6) The above-mentioned supply unit includes: a locking lever that is capable of shifting between a locked position that restricts the rotation of the support member and a released position that allows the rotation of the support member, the locking lever being configured to shift from the locked position to the released position by engaging with the liquid reservoir when the liquid reservoir reaches the end of the guide path.

[0238] According to this configuration, even if the liquid reservoir, located midway along the guide path, presses against the support member, the rotation of the support member is restricted by the locking lever. Therefore, it is possible to prevent the liquid reservoir from colliding with the liquid inlet during installation.

[0239] (7) Alternatively, in the above-mentioned supply unit, the liquid container has a circuit board, the circuit board has a connection terminal and a storage medium for storing information related to the liquid container, and the support member has an electrical connection portion in the base region configured to be electrically connected to the connection terminal.

[0240] Based on this configuration, information stored in the storage medium can be obtained through the electrical connection.

[0241] (8) The above-mentioned supply unit further includes: a push-out mechanism configured to apply force to the liquid reservoir supported by the support member toward the starting end.

[0242] According to this configuration, when the support member is in the guide position, the liquid reservoir can be pressed by the force of the ejection mechanism, so that the connection terminal is properly disengaged from the electrical connection part.

[0243] (9) Alternatively, in the above-mentioned supply unit, the liquid inlet is configured in an inclined position relative to the guide path.

[0244] This configuration allows the rotating liquid reservoir to be smoothly connected to the liquid inlet.

[0245] (10) Alternatively, the supply unit may further include: a storage section disposed below the support member and configured to store liquid supplied from the liquid reservoir; and an atmospheric opening path disposed above the storage section and configured to open the storage section to the atmosphere.

[0246] According to this configuration, since the liquid reservoir is positioned above the storage section, the liquid in the liquid reservoir can flow into the storage section by means of the water level difference.

[0247] (11) Alternatively, in the above-described supply unit, the storage section is a first storage section, and the supply unit further comprises: a second storage section, which communicates with the first storage section and is configured such that the liquid in the first storage section flows into the second storage section; and a one-way valve, which is disposed between the first storage section and the second storage section and is configured to: allow the liquid to flow from the first storage section to the second storage section and restrict the liquid from flowing from the second storage section to the first storage section.

[0248] According to this configuration, the liquid reservoir can be replaced while liquid is being supplied from the second storage unit. Therefore, even during the replacement of the liquid reservoir, it is not necessary to stop the liquid supply.

[0249] (12) The liquid ejection device includes: the supply unit described above; a liquid nozzle for ejecting liquid; and a supply flow path for supplying liquid from the supply unit to the liquid nozzle.

[0250] According to this configuration, after the liquid collection body is horizontally inserted into the front of the liquid dispensing device, it can be connected to the liquid inlet by rotating the liquid collection body and the support member downwards. This allows for loading and unloading of the liquid collection body from the front of the liquid dispensing device, thus providing good operability.

[0251] (13) Alternatively, the liquid ejection device may also include a pressurizing mechanism configured to pressurize the liquid in the supply flow path.

[0252] According to this configuration, the pressurizing mechanism pressurizes the liquid, thereby enabling pressurized cleaning of the liquid discharged from the liquid nozzle.

[0253] (14) Alternatively, the liquid ejection device may also include: a recovery flow path for causing the liquid in the liquid nozzle to flow toward the supply unit.

[0254] This configuration enables the liquid to circulate between the liquid nozzle and the supply unit.

Claims

1. A supply unit, characterized in that, The supply unit is configured as one or more liquid reservoirs for storing liquid and can be installed in a detachable manner. The supply unit includes: The support member extends along a guide path that intersects a vertical line and has: a front end region where the beginning of the guide path is located and a base end region where the end of the guide path is located; A rotating shaft having an axis that intersects both the vertical line and the guide path and is disposed in the base end region; as well as A liquid inlet is disposed below the support member and configured to connect with the liquid reservoir. The support member is configured to rotate about the rotation axis between a guiding position that guides the one or more liquid collection bodies along the guiding path and a connection position that connects the one or more liquid collection bodies to the liquid inlet. The supply unit further includes a locking lever capable of shifting between a locked position that restricts rotation of the support member and a released position that allows rotation of the support member. The locking lever is configured to engage with the liquid reservoir when the liquid reservoir reaches the end of the guide path, thereby shifting from the locked position to the released position.

2. The supply unit according to claim 1, characterized in that, The support member has one or more guide portions for guiding the liquid reservoir.

3. The supply unit according to claim 1, characterized in that, The supply unit further includes: a first force-applying component that applies force to the support component from the connection position toward the guide position.

4. The supply unit according to claim 1, characterized in that, The supply unit also includes: A locking lever, configured to engage with the liquid reservoir supported by the support member when the support member is in the connected position; and The second force-applying component applies force to the engaging rod toward the supporting component.

5. The supply unit according to claim 4, characterized in that, The engaging rod has an inclined surface that engages with the liquid reservoir supported by the supporting member when the supporting member rotates from the connection position toward the guide position.

6. The supply unit according to claim 1, characterized in that, The liquid container has a circuit board. The circuit board has: connection terminals; and a storage medium for storing information related to the liquid container. The support member has an electrical connection portion in the base end region, configured to be electrically connected to the connection terminal.

7. The supply unit according to claim 1, characterized in that, The supply unit further includes a push-out mechanism configured to apply force to the liquid reservoir supported by the support member toward the starting end.

8. The supply unit according to claim 1, characterized in that, The liquid inlet is configured at an angle relative to the guide path.

9. The supply unit according to claim 1, characterized in that, The supply unit also includes: A storage section is disposed below the support member and configured to store liquid supplied from the liquid reservoir; and An atmospheric opening path is disposed on the upper part of the storage section and configured to allow the storage section to be open to the atmosphere.

10. The supply unit according to claim 9, characterized in that, The storage unit is the first storage unit. The supply unit also includes: A second storage section is connected to the first storage section and is configured such that the liquid in the first storage section flows into the second storage section; and A one-way valve is disposed between the first storage section and the second storage section, and is configured to allow the liquid to flow from the first storage section to the second storage section, and restrict the liquid from flowing from the second storage section to the first storage section.

11. A liquid ejection device, characterized in that, The liquid ejection device includes: The supply unit according to any one of claims 1 to 10; Liquid nozzles spray liquid; and The supply flow path supplies liquid from the supply unit to the liquid nozzle.

12. The liquid ejection device according to claim 11, characterized in that, The liquid ejection device further includes a pressurization mechanism configured to pressurize the liquid in the supply path.

13. The liquid ejection device according to claim 11, characterized in that, The liquid ejection device further includes a recovery flow path for directing the liquid in the liquid nozzle toward the supply unit.

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