Valve mechanism, liquid ejecting apparatus, and method for controlling liquid ejecting apparatus

Abstract

The invention provides a valve mechanism, a liquid ejecting apparatus, and a control method of the liquid ejecting apparatus. A valve mechanism (29) provided in the middle of a flow path (26) through which a fluid flows is provided with: a first base body (39) constituting a part of the flow path (26); a valve part (47) capable of closing the flow path (26); a pressure receiving part (48) having flexibility; the valve (47) is provided with a pressure receiving portion (48), a first cover member (41) forming a first space (50) between the pressure receiving portion (48) and the first cover member (41), and a rod portion (42) provided in the first space (50), the rod portion (42) pressing the valve (47) in the direction of closing the flow path (26) on the basis of displacement of the pressure receiving portion (48) caused by pressure reduction in the first space (50).

Description

Technical Field

[0001] The invention relates to a valve mechanism, a liquid ejecting device and a control method of the liquid ejecting device. Background Art

[0002] For example, as in Patent Document 1, there is a recording device that prints by ejecting ink from a liquid ejection head, the liquid ejection head is an example of a liquid ejection unit, the ink is an example of a liquid, and the recording device is an example of a liquid ejection device. The recording device includes: a flow path for supplying ink and a flow path opening and closing unit as an example of a valve mechanism.

[0003] The flow path opening and closing unit includes a third recess, a fourth recess, and a second flexible member. The second flexible member is disposed between the third recess and the fourth recess. The third recess and the second flexible member constitute an ink chamber for storing ink. The fourth recess and the second flexible member constitute an air chamber. The flow path opening and closing unit blocks the flow path by displacing the second flexible member due to air supplied to the air chamber.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2015-189201

[0005] The flow path opening and closing unit of Patent Document 1 closes the flow path by pressurizing the air chamber. If the air chamber is pressurized, there is a possibility that the third recessed portion constituting the air chamber and the second flexible member will not be in close contact with each other, and leakage may occur. Summary of the invention

[0006] A valve mechanism that solves the above-mentioned technical problem is a valve mechanism arranged in the middle of a flow path in which a fluid flows, and the valve mechanism comprises: a base body, which constitutes a part of the flow path; a valve part, which can close the flow path; a pressure-bearing part, which is flexible; a first cover part, which forms a first space between the first cover part and the pressure-bearing part; and a rod part, which is arranged in the first space, wherein the rod part pushes the valve part in a direction of closing the flow path based on the displacement of the pressure-bearing part caused by the reduced pressure in the first space.

[0007] A liquid ejection device for solving the above-mentioned technical problem comprises: a valve mechanism of the above-mentioned structure; a liquid ejection part for ejecting liquid; the flow path for supplying the liquid to the liquid ejection part; and a decompression source, wherein the first cover part has a first connecting hole for connecting the decompression source with the first space, and the decompression source can decompress the first space via the first connecting hole.

[0008] A valve mechanism that solves the above-mentioned technical problem is a valve mechanism arranged in the middle of multiple flow paths in which multiple fluids flow respectively, and the valve mechanism comprises: a base body, which constitutes a part of each of the multiple flow paths; multiple valve parts, which can respectively close the multiple flow paths; a pressure-bearing part, which is flexible; a first cover part, which forms a first space between the first cover part and the pressure-bearing part; and a rod part, which is arranged in the first space, wherein the rod part pushes the multiple valve parts in the direction of closing the multiple flow paths based on the displacement of the pressure-bearing part caused by the reduced pressure in the first space.

[0009] A liquid ejection device that solves the above-mentioned technical problem comprises: a valve mechanism of the above-mentioned structure; a liquid ejection part that ejects a plurality of liquids; a plurality of flow paths that supply a plurality of liquids to the liquid ejection part; and a decompression source, wherein the first cover part has a first connecting hole that connects the decompression source and the first space, and the decompression source can decompress the first space via the first connecting hole.

[0010] A control method for a liquid ejection device that solves the above technical problems, the liquid ejection device comprising: a liquid ejection portion that ejects liquid; a flow path that supplies the liquid to the liquid ejection portion; a decompression source; a substrate that constitutes a part of the flow path; a valve portion that can close the flow path; a pressure-receiving portion that is flexible; a first cover member that forms a first space with the pressure-receiving portion; a rod portion that is disposed in the first space; a liquid chamber that is disposed in the flow path between the valve portion and the liquid ejection portion, at least a portion of which is composed of a flexible member that is flexible; a force-applying member that applies force to the flexible member in a direction in which the volume of the liquid chamber becomes smaller; and a second cover member that forms a second space with the flexible member. and an atmosphere connecting portion, which can connect the second space with the atmosphere. The control method of the liquid ejection device includes: decompressing the second space by the decompression source, thereby causing the flexible member to displace in the direction of increasing the volume of the liquid chamber to introduce the liquid into the liquid chamber; decompressing the first space by the decompression source, thereby causing the pressure-bearing portion to displace; based on the displacement of the pressure-bearing portion, causing the rod portion to push the valve portion to close a portion of the flow path; connecting the second space with the atmosphere by the atmosphere connecting portion, thereby pushing the flexible member with the force applied by the force-applying member to push the liquid in the liquid chamber toward the liquid ejection portion.

[0011] A control method for a liquid ejection device that solves the above-mentioned technical problems, the liquid ejection device comprising: a liquid ejection part that ejects a plurality of liquids; a plurality of flow paths that supply the plurality of liquids to the liquid ejection part; a decompression source; a substrate that constitutes a part of each of the plurality of flow paths; a plurality of valve parts that can close the plurality of flow paths; a pressure-receiving part that is flexible; a first cover part that forms a first space between the cover part and the pressure-receiving part; a rod part that is arranged in the first space; a plurality of liquid chambers that are arranged between the valve part and the liquid ejection part in the plurality of flow paths, at least a part of which is composed of a flexible part that is flexible; a plurality of force-applying parts that apply force to the flexible part in a direction in which the volume of the plurality of liquid chambers becomes smaller; and a second cover part that is located between the cover part and the flexible part at a position corresponding to the plurality of liquid chambers. A plurality of second spaces are formed; and an atmosphere connecting portion can connect the plurality of second spaces with the atmosphere, and the control method of the liquid ejection device includes: by decompressing the plurality of second spaces by the decompression source, the flexible member is displaced in the direction of increasing the volume of the plurality of liquid chambers to introduce the liquid into the plurality of liquid chambers; by decompressing the first space by the decompression source, the pressure-bearing portion is displaced; based on the displacement of the pressure-bearing portion, the rod portion pushes the plurality of valve portions to close a portion of each of the plurality of flow paths; by connecting the plurality of second spaces with the atmosphere by the atmosphere connecting portion, the flexible member is pushed by the force applied by the plurality of force-applying members to push the liquid in the plurality of liquid chambers toward the liquid ejection portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a first embodiment of the liquid ejecting device.

[0013] Figure 2 It is a schematic diagram of a second embodiment of the liquid ejecting device.

[0014] Figure 3 It is a top view of the first substrate and the first flexible component.

[0015] Figure 4 It is a top view of the first substrate, the first flexible component and the rod.

[0016] Description of Reference Numerals

[0017] 11…Liquid ejection device, 12…Decompression portion, 13…Mounting portion, 14…Supply mechanism, 15…Liquid ejection portion, 16…Atmosphere communication portion, 18…Decompression source, 19…First decompression path, 20…Second decompression path, 21…Third decompression path, 23…Nozzle, 24…Liquid storage portion, 26…Flow path, 27…Supply pump, 28…Adjustment portion, 29…Valve mechanism, 30…Pressing portion, 32…First check valve, 33…Second check valve, 34…Displacement portion, 35…Pump chamber, 36…Pressure chamber, 37…Spring, 39…First substrate as an example of a substrate, 40…First flexible member, 41…First cover member, 42…Rod, 43…Pushing member, 43a…first edge portion, 43b…second edge portion, 43c…third edge portion, 43d…fourth edge portion, 45…valve seat, 47…valve portion, 48…pressure-bearing portion, 50…first space, 51…pillar, 52…first communicating hole, 53…fulcrum portion, 54…first passive portion, 55…second passive portion, 57…second base, 58…second flexible member as an example of a flexible member, 59…second cover member, 60…force-applying member, 62…second space, 63…liquid chamber, 65…second communicating hole, 67…control portion, 69…positioning portion, D1…long side direction, D2…short side direction, Dd…pushing down direction, Ds…supply direction, Du…pushing up direction. DETAILED DESCRIPTION

[0018] First embodiment

[0019] A first embodiment of a valve mechanism, a liquid ejection device, and a control method of the liquid ejection device is described below with reference to the accompanying drawings. The liquid ejection device is an inkjet printer that ejects ink, an example of a liquid, onto a medium such as paper, cloth, vinyl plastic, plastic parts, or metal parts to print.

[0020] Liquid spraying device

[0021] like Figure 1 As shown in FIG. 1 , the liquid ejecting device 11 may include a pressure reducing portion 12, a mounting portion 13, and a supply mechanism 14. The liquid ejecting device 11 may include a liquid ejecting portion 15 and an atmosphere communicating portion 16.

[0022] The decompression unit 12 may include a decompression source 18, a first decompression path 19, a second decompression path 20, and a third decompression path 21. The first decompression path 19, the second decompression path 20, and the third decompression path 21 connect the decompression source 18 and the supply mechanism 14, respectively.

[0023] The liquid ejecting unit 15 can eject liquid. The liquid ejecting unit 15 ejects liquid from a plurality of nozzles 23 to print on a medium (not shown).

[0024] The liquid storage unit 24 storing liquid can be mounted on the mounting portion 13. The liquid storage unit 24 may be a box, a bag, or the like, or may be a tank capable of replenishing liquid.

[0025] Supply Agency

[0026] The supply mechanism 14 may include a flow path 26, a supply pump 27, an adjustment unit 28, a valve mechanism 29, and a pressurizing unit 30. The supply mechanism 14 supplies the liquid contained in the liquid containing unit 24 to the liquid ejecting unit 15.

[0027] Liquid flows in the flow path 26. The liquid in this embodiment is an example of a fluid. The flow path 26 supplies liquid to the liquid ejection portion 15. The liquid flows in the flow path 26 in the supply direction Ds. The upstream end of the flow path 26 is connected to the liquid storage portion 24 mounted on the mounting portion 13. The downstream end of the flow path 26 is connected to the liquid ejection portion 15. A supply pump 27, an adjustment portion 28, a valve mechanism 29, and a pressurizing portion 30 are provided in the middle of the flow path 26.

[0028] Supply pump

[0029] The supply pump 27 supplies the liquid to the liquid ejection unit 15. The supply pump 27 may include a first check valve 32, a second check valve 33, a displacement unit 34, a pump chamber 35, a pressure chamber 36, and a spring 37.

[0030] The first check valve 32 is disposed at a position upstream of the pump chamber 35 in the supply direction Ds. The second check valve 33 is disposed at a position downstream of the pump chamber 35 in the supply direction Ds. The first check valve 32 and the second check valve 33 allow the flow of liquid toward the downstream of the supply direction Ds. The first check valve 32 and the second check valve 33 restrict the flow of liquid toward the upstream of the supply direction Ds.

[0031] The displacement portion 34 divides the pump chamber 35 and the pressure chamber 36. The displacement portion 34 may have flexibility. The displacement portion 34 changes the volume of the pump chamber 35 by deforming according to the difference in pressure between the pump chamber 35 and the pressure chamber 36.

[0032] The spring 37 is provided in the pressure chamber 36. The spring 37 pushes the displacement portion 34 in a direction in which the volume of the pump chamber 35 is reduced.

[0033] The first decompression path 19 connects the decompression source 18 and the pressure chamber 36. The decompression source 18 can decompress the pressure chamber 36. The decompression source 18 increases the volume of the pump chamber 35 by decompressing the pressure chamber 36. When the volume of the pump chamber 35 increases, the supply pump 27 draws liquid from the liquid containing portion 24. When the decompression source 18 releases the decompression of the pressure chamber 36, the spring 37 pushes the displacement portion 34. The spring 37 pushes out the liquid in the pump chamber 35 by reducing the volume of the pump chamber 35.

[0034] The decompression source 18 drives the supply pump 27 by alternately decompressing and releasing the pressure in the pressure chamber 36. The decompression source 18 may drive the supply pump 27 while the liquid ejection device 11 is operating.

[0035] Adjustment Department

[0036] The adjusting unit 28 adjusts the pressure of the liquid supplied to the liquid ejection unit 15. The adjusting unit 28 sets the pressure of the liquid on the downstream side of the adjusting unit 28 to a predetermined negative pressure. When the pressure difference between the pressure on the downstream side and the atmospheric pressure is small, the adjusting unit 28 restricts the passage of the liquid. When the pressure difference between the pressure on the downstream side and the atmospheric pressure becomes large, the adjusting unit 28 allows the passage of the liquid.

[0037] Valve mechanism

[0038] The valve mechanism 29 may include a first base 39 as an example of a base, a first flexible member 40 , a first cover member 41 , a rod 42 , and a pressing member 43 .

[0039] A part of the flow path 26 is formed in the first base body 39. The first base body 39 may have a valve seat 45.

[0040] The first flexible member 40 may also include a valve portion 47 and a pressure receiving portion 48. The valve portion 47 and the pressure receiving portion 48 of this embodiment are integrally formed. The valve portion 47 may also be flexible. The valve portion 47 of this embodiment has elasticity. The pressure receiving portion 48 has flexibility. The valve portion 47 and the pressure receiving portion 48 are arranged in the longitudinal direction D1 of the rod portion 42.

[0041] The first base 39 and the first cover member 41 sandwich the first flexible member 40 and the pressing member 43. The pressing member 43 is located between the rod 42 and the first flexible member 40. The pressing member 43 presses the first flexible member 40.

[0042] The first space 50 is formed between the first cover member 41 and the first flexible member 40. In other words, the first space 50 is formed between the first cover member 41 and the valve portion 47. The first space 50 is formed between the first cover member 41 and the pressure receiving portion 48.

[0043] The first cover member 41 may include a support column 51. The support column 51 is located in the first space 50. The support column 51 is located on the opposite side of the first flexible member 40 with respect to the rod portion 42. The support column 51 is located between the pressure receiving portion 48 and the valve portion 47 in the longitudinal direction D1.

[0044] The first cover member 41 has a first communicating hole 52. The first communicating hole 52 communicates the decompression source 18 and the first space 50. Communication refers to connecting a fluid such as a liquid or a gas so that it can flow. The first communicating hole 52 of this embodiment is connected to the second decompression path 20. The first communicating hole 52 communicates with the decompression source 18 via the second decompression path 20. The decompression source 18 can decompress the first space 50 via the first communicating hole 52.

[0045] The pressure receiving portion 48 may form a space between the pressure receiving portion 48 and the first base body 39. The space between the pressure receiving portion 48 and the first base body 39 may communicate with the atmosphere.

[0046] The pressure receiving portion 48 is more easily deformed than the valve portion 47. For example, the thickness of the pressure receiving portion 48 is thinner than the thickness of the valve portion 47. The pressure receiving portion 48 and the valve portion 47 may also be formed to be circular when viewed from above. The diameter of the pressure receiving portion 48 is larger than the diameter of the valve portion 47. The area of ​​the pressure receiving portion 48 to which the pressure of the first space 50 acts is larger than the area of ​​the valve portion 47 to which the pressure of the first space 50 acts.

[0047] The valve portion 47 can close the flow path 26. A portion of the flow path 26 is formed between the valve portion 47 and the first substrate 39. The valve portion 47 faces the valve seat 45. The valve portion 47 is spaced apart from the valve seat 45. Figure 1 The valve portion 47 opens the flow path 26 by being in the open position (not shown) in which it contacts the valve seat 45, thereby closing the flow path 26.

[0048] The rod portion 42 is disposed in the first space 50. The rod portion 42 has a fulcrum portion 53, a first passive portion 54, and a second passive portion 55. The fulcrum portion 53 is located between the first passive portion 54 and the second passive portion 55 in the longitudinal direction D1. The fulcrum portion 53 is located between the pressure receiving portion 48 and the valve portion 47 in the longitudinal direction D1. The fulcrum portion 53 of the present embodiment is a hole with a bottom. The bottom of the fulcrum portion 53 is in contact with the front end of the support 51. The rod portion 42 can be shaken in a manner that changes the inclination relative to the longitudinal direction D1, using the front end of the support 51 as a fulcrum.

[0049] The first passive portion 54 is located on the opposite side of the second passive portion 55 in the long side direction D1. The first passive portion 54 can contact the pressure receiving portion 48. The second passive portion 55 can contact the valve portion 47. The first passive portion 54 and the second passive portion 55 can move in the push-up direction Du and the push-down direction Dd, respectively. The push-up direction Du is the opposite direction to the push-down direction Dd. The second passive portion 55 is displaced in the opposite direction to the first passive portion 54.

[0050] Pressurizing unit

[0051] The pressurizing unit 30 may include a second base 57, a second flexible member 58 as an example of a flexible member, a second cover member 59, and a biasing member 60. The second flexible member 58 has flexibility.

[0052] The second base 57 and the second cover member 59 sandwich the second flexible member 58. A second space 62 is formed between the second cover member 59 and the second flexible member 58. A liquid chamber 63 is formed between the second flexible member 58 and the second base 57. That is, the pressurizing unit 30 includes the liquid chamber 63.

[0053] The urging member 60 is, for example, a spring. The urging member 60 is disposed in the second space 62. The urging member 60 urges the second flexible member 58 in a direction in which the volume of the liquid chamber 63 decreases. The urging means pushing back an object when a force is applied to the object.

[0054] At least a part of the liquid chamber 63 is constituted by the second flexible member 58. The liquid chamber 63 constitutes a part of the flow path 26. The liquid chamber 63 is provided between the valve mechanism 29 and the liquid ejection portion 15 in the flow path 26.

[0055] The second communication hole 65 is provided in the second cover member 59. The second communication hole 65 communicates the decompression source 18 and the second space 62. The second communication hole 65 of this embodiment is connected to the third decompression path 21. The second communication hole 65 communicates with the decompression source 18 via the third decompression path 21. The decompression source 18 can decompress the inside of the second space 62 via the second communication hole 65.

[0056] The atmosphere communication portion 16 may be connected to the third decompression path 21. The atmosphere communication portion 16 may communicate the second space 62 with the atmosphere via the third decompression path 21. The atmosphere communication portion 16 can communicate the inside of the second space 62 with the atmosphere.

[0057] The liquid ejection device 11 includes a control unit 67. The control unit 67 controls the driving of each mechanism in the liquid ejection device 11 as a whole. The control unit 67 controls various operations performed by the liquid ejection device 11.

[0058] The control unit 67 can be configured as a circuit as described below, which includes: α: one or more processors that execute various processes according to a computer program; β: one or more dedicated hardware circuits that execute at least a portion of the various processes; or γ: a combination of these. The hardware circuit is, for example, an integrated circuit for a specific purpose. The processor includes a CPU, and a memory such as a RAM and a ROM, and the memory stores a program code or instruction configured to cause the CPU to execute a process. The memory, i.e., the computer-readable medium, includes all readable media that can be accessed by a general-purpose or dedicated computer.

[0059] Control method of liquid ejection device

[0060] The control unit 67 performs pressure cleaning by controlling the driving of the decompression source 18 and the atmosphere communication unit 16. Pressure cleaning is a maintenance in which pressurized liquid is supplied to the liquid ejection unit 15 to cause the liquid to overflow from the nozzle 23.

[0061] In the case of pressurized cleaning, first, the control unit 67 reduces the pressure in the second space 62 through the decompression source 18. When the pressure in the second space 62 is reduced, the second flexible member 58 is displaced in the direction of increasing the volume of the liquid chamber 63. At this time, the valve unit 47 is in the open position. Therefore, the pressurizing unit 30 introduces liquid into the liquid chamber 63.

[0062] Next, the control unit 67 reduces the pressure in the first space 50 through the decompression source 18. The control unit 67 displaces the pressure receiving portion 48 by reducing the pressure in the first space 50. The pressure receiving portion 48 displaces so that the volume of the first space 50 decreases.

[0063] The displaced pressure receiving portion 48 causes the first passive portion 54 to move in the upward push direction Du. At this time, the second passive portion 55 moves in the downward push direction Dd. The second passive portion 55 pushes the valve portion 47. The valve portion 47 moves to the closed position. That is, the valve mechanism 29 causes the rod portion 42 to push the valve portion 47 based on the displacement of the pressure receiving portion 48 to close a portion of the flow path 26.

[0064] The control unit 67 communicates the second space 62 with the atmosphere through the atmosphere communication unit 16. The control unit 67 communicates the second space 62 with the atmosphere, thereby pushing the second flexible member 58 with the force applied by the force application member 60. At this time, the valve unit 47 closes the flow path 26. Therefore, the force application member 60 pushes the liquid in the liquid chamber 63 toward the liquid ejection unit 15. As a result, the liquid nozzle 23 overflows. That is, the liquid with increased viscosity, foreign matter, etc. are discharged from the nozzle 23. The control unit 67 can also make a wiper (not shown) perform a wiping operation of wiping the liquid ejection unit 15.

[0065] The control unit 67 releases the decompression in the first space 50. When the decompression in the first space 50 is released, the force of the pressure-receiving portion 48 pushing the rod portion 42 becomes smaller. The valve portion 47 located in the closed position moves to the open position due to elasticity. The valve portion 47 opens the flow path 26. The valve portion 47 pushes the second passive portion 55 in the push-up direction Du. When the second passive portion 55 moves in the push-up direction Du, in the rod portion 42, the first passive portion 54 pushes the pressure-receiving portion 48 in the push-down direction Dd. The pressure-receiving portion 48 is displaced in such a way that the volume of the first space 50 becomes larger.

[0066] Function of the first embodiment

[0067] The operation of this embodiment will be described.

[0068] When the pressure-reducing source 18 depressurizes the first space 50, the pressure-receiving portion 48 is displaced. The rod 42 pushes the valve portion 47 in a direction to close the flow path 26 based on the displacement of the pressure-receiving portion 48 caused by the depressurization in the first space 50. When the depressurization in the first space 50 is released, the valve portion 47 opens the flow path 26.

[0069] Effects of the First Embodiment

[0070] The effects of this embodiment will be described.

[0071] (1-1) The pressure receiving portion 48 is displaced due to the decompression in the first space 50. The rod portion 42 closes the flow path 26 by pressing the valve portion 47 based on the displacement of the pressure receiving portion 48. When the first space 50 is decompressed, the close contact between the pressure receiving portion 48 and the first cover member 41 is less likely to decrease compared to the case where the first space 50 is pressurized. Therefore, the occurrence of leakage can be suppressed.

[0072] (1-2) When the decompression source 18 decompresses the second space 62, the second flexible member 58 is displaced in such a manner that the volume of the liquid chamber 63 increases. The liquid chamber 63 introduces liquid as the volume increases. When the atmosphere communication portion 16 connects the second space 62 to the atmosphere, the second flexible member 58 is displaced in such a manner that the volume of the liquid chamber 63 decreases due to the force applied by the force application member 60, and the liquid is pushed out of the liquid chamber 63. Therefore, the liquid can be pressurized and supplied to the liquid ejection portion 15 by the decompression source 18 that closes the flow path 26.

[0073] Second embodiment

[0074] Then, the second embodiment of the liquid ejection device is described with reference to the accompanying drawings. It should be noted that the second embodiment is different from the first embodiment in that it has a plurality of flow paths. In addition, other points are substantially the same as the first embodiment, and therefore, repeated descriptions are omitted by marking the same reference numerals with the same configurations.

[0075] like Figure 2 As shown, the liquid ejection device 11 includes a plurality of flow paths 26. The plurality of flow paths 26 may be connected to different liquid containing parts 24, respectively. More than one liquid containing part 24 may be installed on the mounting part 13. The liquid ejection device 11 may also include a plurality of mounting parts 13. The plurality of liquid containing parts 24 may also contain different types of liquids, respectively. In the plurality of flow paths 26, a plurality of fluids flow respectively. The plurality of flow paths 26 supply a plurality of liquids to the liquid ejection part 15. The liquid ejection part 15 ejects a plurality of liquids.

[0076] A supply pump 27 and an adjustment unit 28 are provided in each of the plurality of flow paths 26. The liquid ejection device 11 includes a plurality of supply pumps 27 and a plurality of adjustment units 28. The liquid ejection device 11 may include a valve mechanism 29 and a pressurizing unit 30 for the plurality of flow paths 26. The valve mechanism 29 and the pressurizing unit 30 of this embodiment are provided in the middle of the plurality of flow paths 26.

[0077] Valve mechanism

[0078] like Figure 2 As shown, a portion of each of the plurality of flow paths 26 is formed in the first base body 39. The first base body 39 may also have a plurality of valve seats 45.

[0079] The first flexible member 40 may include a plurality of valve portions 47. The plurality of valve portions 47 may be arranged in the short-side direction D2 of the rod portion 42. The plurality of valve portions 47 are provided in the plurality of flow paths 26, respectively. The plurality of valve portions 47 may close the plurality of flow paths 26, respectively.

[0080] like Figure 3 As shown, the first flexible member 40 may also have a pressure-receiving portion 48 and a plurality of valve portions 47. The valve mechanism 29 may also include a plurality of first flexible members 40. The first flexible member 40 of this embodiment has a pressure-receiving portion 48 and two valve portions 47. The area of ​​the pressure-receiving portion 48 to which the pressure of the first space 50 acts is greater than the total area of ​​the two valve portions 47 to which the pressure of the first space 50 acts.

[0081] The valve mechanism 29 may include a plurality of pressing members 43. The pressing member 43 includes a first edge portion 43a, a second edge portion 43b, a third edge portion 43c, and a fourth edge portion 43d.

[0082] The first edge portion 43a, the third edge portion 43c, and the fourth edge portion 43d are located between the pressure receiving portion 48 and the valve portion 47 in the long side direction D1. The first edge portion 43a and the third edge portion 43c extend linearly in the long side direction D1. The second edge portion 43b is located between the plurality of valve portions 47 in the short side direction D2. The second edge portion 43b extends linearly in the short side direction D2. The fourth edge portion 43d extends in an arc shape along the edge of the pressure receiving portion 48.

[0083] like Figure 4 As shown, the first edge portion 43a, the second edge portion 43b and the third edge portion 43c are located outside the rod portion 42. The first cover member 41 pushes the first edge portion 43a, the second edge portion 43 and the third edge portion 43c. The first cover member 41 pushes the pushing member 43 while pushing the outer periphery of the first flexible member 40. The first cover member 41 pushes the inner side of the first flexible member 40 via the pushing member 43.

[0084] The valve mechanism 29 may include a plurality of rods 42. The valve mechanism 29 may include a plurality of support posts 51. The plurality of rods 42 can be swung with the tip of each support post 51 as a fulcrum so that the inclination with respect to the longitudinal direction D1 changes.

[0085] The rod portion 42 may include one or more positioning portions 69. The positioning portion 69 restricts movement of the rod portion 42 in the longitudinal direction D1.

[0086] like Figure 2 As shown, the fulcrum portion 53 may also be located at the center of the rod portion 42 in the short-side direction D2. The rod portion 42 can be swung in a manner that changes the inclination relative to the short-side direction D2, using the front end of the support 51 as a fulcrum. When the positions of the plurality of valve portions 47 in the push-up direction Du are different, the rod portion 42 follows the plurality of valve portions 47 and tilts.

[0087] Pressurizing unit

[0088] like Figure 2 As shown, a plurality of second spaces 62 are formed between the second cover member 59 and the second flexible member 58. A plurality of liquid chambers 63 are formed between the second flexible member 58 and the second base 57. That is, the pressurizing portion 30 includes a plurality of liquid chambers 63. The plurality of second spaces 62 are formed at positions corresponding to the plurality of liquid chambers 63, respectively.

[0089] The pressurizing unit 30 includes a plurality of urging members 60. The plurality of urging members 60 are respectively provided in the second space 62. The plurality of urging members 60 urge the second flexible member 58 in a direction in which the volume of the liquid chamber 63 decreases.

[0090] At least a part of each liquid chamber 63 is constituted by the second flexible member 58. The plurality of liquid chambers 63 respectively constitute a part of different flow paths 26. The liquid chamber 63 is provided between the valve mechanism 29 and the liquid ejection unit 15 in each flow path 26.

[0091] The second cover member 59 is provided with a plurality of second communication holes 65. The second communication holes 65 communicate with the decompression source 18 and the second space 62. The atmosphere communication portion 16 can communicate the plurality of second spaces 62 with the atmosphere.

[0092] Control method of liquid ejection device

[0093] like Figure 2As shown, when performing pressurized cleaning, first, the control unit 67 reduces the pressure in the plurality of second spaces 62 through the pressure reduction source 18. The control unit 67 may also select a second space 62 corresponding to the nozzle 23 for pressurized cleaning from among the plurality of second spaces 62 and reduce the pressure. When the pressure in the second space 62 is reduced, in the second flexible member 58, the portion that divides the second space 62 and the liquid chamber 63 is displaced in the direction in which the volume of the liquid chamber 63 becomes larger. At this time, the plurality of valve portions 47 are located in the open position. Therefore, the pressurizing unit 30 introduces liquid into one or more liquid chambers 63.

[0094] like Figure 2 , Figure 4 As shown, the control unit 67 then reduces the pressure in the first space 50 through the pressure reduction source 18. The control unit 67 displaces the pressure receiving portion 48 by reducing the pressure in the first space 50. The pressure receiving portion 48 displaces so that the volume of the first space 50 decreases.

[0095] The displaced pressure receiving portion 48 causes the first passive portion 54 to move in the upward push direction Du. At this time, the second passive portion 55 moves in the downward push direction Dd. The second passive portion 55 pushes the plurality of valve portions 47. The plurality of valve portions 47 move to the closed position. That is, the valve mechanism 29 causes the rod portion 42 to push the plurality of valve portions 47 to close a portion of each of the plurality of flow paths 26 based on the displacement of the pressure receiving portion 48.

[0096] like Figure 2 As shown, the control unit 67 connects the plurality of second spaces 62 to the atmosphere through the atmosphere connecting unit 16. The control unit 67 connects the plurality of second spaces 62 to the atmosphere, thereby pushing the second flexible member 58 with the applied force of the plurality of force applying members 60. At this time, the plurality of valve portions 47 close each flow path 26. Therefore, the plurality of force applying members 60 push the liquid in the plurality of liquid chambers 63 toward the liquid ejection unit 15. As a result, the liquid overflows from the nozzle 23. That is, the liquid with increased viscosity, foreign matter, etc. are discharged from the nozzle 23. The control unit 67 can also cause a wiper, not shown in the figure, to perform a wiping operation of wiping the liquid ejection unit 15.

[0097] The control unit 67 releases the decompression in the first space 50. When the decompression in the first space 50 is released, the force of the pressure-receiving portion 48 pushing the rod portion 42 becomes smaller. The multiple valve portions 47 located in the closed position move to the open position due to elasticity. The multiple valve portions 47 push the rod portion 42 in the upward push direction Du. In the rod portion 42 where the second passive portion 55 is pushed by the valve portion 47, the first passive portion 54 pushes the pressure-receiving portion 48 in the downward push direction Dd. The pressure-receiving portion 48 is displaced to increase the volume of the first space 50.

[0098] Effects of the Second Embodiment

[0099] The operation of this embodiment will be described.

[0100] When the pressure-reducing source 18 depressurizes the first space 50, the pressure-receiving portion 48 is displaced. Based on the displacement of the pressure-receiving portion 48 caused by the depressurization in the first space 50, the rod portion 42 pushes the plurality of valve portions 47 in a direction to close the plurality of flow paths 26. When the depressurization in the first space 50 is released, the plurality of valve portions 47 open the plurality of flow paths 26.

[0101] Effects of the Second Embodiment

[0102] The effects of this embodiment will be described.

[0103] (2-1) A plurality of flow paths 26 can be closed by one rod portion 42. Therefore, the structure can be simplified compared to a case where the same number of rod portions 42 as the number of valve portions 47 are provided.

[0104] Change Example

[0105] This embodiment can be implemented with modifications as described below. This embodiment and the following modifications can be implemented in combination with each other within the scope of no technical contradiction.

[0106] The valve portion 47 and the pressure receiving portion 48 may be formed of different components.

[0107] The valve portion 47 may be inflexible, for example, a piston.

[0108] The valve mechanism 29 may include a spring that pushes the valve portion 47 located at the closed position toward the open position.

[0109] One of the second base 57 and the second cover member 59 may be formed integrally with the first base 39 .

[0110] One of the second base body 57 and the second cover member 59 may be formed integrally with the first cover member 41 .

[0111] The decompression portion 12 may be configured without at least one of the first decompression path 19, the second decompression path 20, and the third decompression path 21. The decompression source 18 may be directly provided in the first communication hole 52, for example.

[0112] The liquid ejection device 11 may also release the decompression in the first space 50 by sending air into the first space 50. The liquid ejection device 11 may also release the decompression in the first space 50 by connecting the first space 50 to the atmosphere. The atmosphere communication portion 16 may also connect the first space 50 to the atmosphere.

[0113] The first cover member 41 may be configured not to have the first communication hole 52 . For example, the valve mechanism 29 may sandwich a member constituting the second decompression path 20 between the first cover member 41 and the first flexible member 40 .

[0114] The second cover member 59 may be configured not to have the second communication hole 65. For example, the pressurizing portion 30 may sandwich a member constituting the third decompression path 21 between the second cover member 59 and the second flexible member 58.

[0115] The first flexible member 40 may include a plurality of pressure receiving portions 48 and a plurality of valve portions 47. The two first flexible members 40 in the second embodiment may be integrally formed.

[0116] The valve mechanism 29 may be provided in the middle of the flow path through which the gas flows. For example, the valve mechanism 29 may be provided in at least one of the first decompression path 19 , the second decompression path 20 , and the third decompression path 21 .

[0117] The liquid ejection device 11 may include a plurality of valve mechanisms 29. The plurality of valve mechanisms 29 may be provided in the plurality of flow paths 26, respectively.

[0118] The liquid ejection device 11 may include a plurality of pressurizing units 30. The plurality of pressurizing units 30 may be provided in the plurality of flow paths 26, respectively.

[0119] The liquid ejection device 11 may also be a liquid ejection device that ejects or sprays other liquids other than ink. The state of the liquid ejected from the liquid ejection device in a tiny amount of droplets also includes the state of granular, tear-shaped, and linear tailing. The liquid described here can be any material that can be ejected from the liquid ejection device. For example, the liquid can be any material in the state of the substance in the liquid phase, including high or low viscosity liquid bodies, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and fluid bodies such as molten metal. Liquids include not only liquids as a state of matter, but also substances formed by dissolving, dispersing or mixing particles of functional materials composed of solids such as pigments and metal particles in solvents. As representative examples of liquids, inks and liquid crystals described in the above embodiments can be listed. Here, inks include various liquid compositions such as general aqueous inks and oily inks as well as gel inks and hot melt inks. As a specific example of a liquid ejection device, for example, there is a device that ejects a liquid containing electrode materials, colorants, and other materials used in the manufacture of liquid crystal displays, electroluminescent displays, surface-emitting displays, and color filters in a dispersed or dissolved manner. The liquid ejection device may also be a device that ejects biological organic matter used in the manufacture of biochips, a device used as a precision pipette and ejecting a liquid that becomes a sample, a printing and dyeing device, a micro-dispenser, and the like. The liquid ejection device may also be a device that ejects lubricating oil to precision machinery such as watches and cameras at a pinpoint, and an apparatus that ejects a transparent resin liquid such as ultraviolet curing resin onto a substrate in order to form a tiny hemispherical lens, an optical lens, and the like used for optical communication elements. The liquid ejection device may also be a device that ejects an etching liquid such as an acid or an alkali in order to etch a substrate.

[0120] definition

[0121] The expression "at least one" used in this specification means "more than one" of the desired options. As an example, if the number of options is two, the expression "at least one" used in this specification means "only one option" or "both sides of the two options". As another example, if the number of options is three or more, the expression "at least one" used in this specification means "only one option", "a combination of two arbitrary options" or "a combination of three or more arbitrary options".

[0122] Notes

[0123] The technical solutions and their effects obtained from the above-mentioned embodiments and modifications will be described below.

[0124] (A) A valve mechanism disposed in the middle of a flow path through which a fluid flows, the valve mechanism comprising: a base constituting a portion of the flow path; a valve portion capable of closing the flow path; a pressure-receiving portion having flexibility; a first cover member forming a first space between the first cover member and the pressure-receiving portion; and a rod portion disposed in the first space, wherein the rod portion pushes the valve portion in a direction of closing the flow path based on displacement of the pressure-receiving portion caused by reduced pressure in the first space.

[0125] According to this configuration, the pressure receiving portion is displaced due to the decompression in the first space. The rod portion pushes the valve portion based on the displacement of the pressure receiving portion, thereby closing the flow path. When the first space is decompressed, the close contact between the pressure receiving portion and the first cover member is less likely to decrease compared to the case where the first space is pressurized. Therefore, the occurrence of leakage can be suppressed.

[0126] (B) It may also be that the liquid ejection device comprises: the valve mechanism of the above-mentioned structure; a liquid ejection part that ejects liquid; the flow path that supplies the liquid to the liquid ejection part; and a decompression source, wherein the first cover member has a first connecting hole for connecting the decompression source with the first space, and the decompression source can decompress the first space via the first connecting hole.

[0127] According to this configuration, the same effects as those of the above-mentioned valve mechanism can be achieved.

[0128] (C) It may also be that: the liquid ejection device further comprises: a liquid chamber, which is arranged between the valve mechanism and the liquid ejection part in the flow path, and at least a part of which is composed of a flexible member having flexibility; a force-applying member, which applies force to the flexible member in the direction in which the volume of the liquid chamber becomes smaller; a second cover member, which forms a second space between the cover member and the flexible member, and is provided with a second connecting hole for connecting the decompression source with the second space; and an atmosphere connecting part, which can connect the second space with the atmosphere.

[0129] According to this configuration, when the decompression source decompresses the second space, the flexible member is displaced to increase the volume of the liquid chamber. The liquid chamber introduces liquid as the volume increases. When the atmosphere communication portion connects the second space to the atmosphere, the flexible member is displaced in a manner that the volume of the liquid chamber decreases due to the force applied by the force-applying member, thereby pushing the liquid out of the liquid chamber. Therefore, the liquid can be pressurized and supplied to the liquid ejection portion by the decompression source that closes the flow path.

[0130] (D) A valve mechanism disposed in the middle of a plurality of flow paths through which a plurality of fluids flow respectively, the valve mechanism comprising: a base constituting a part of each of the plurality of flow paths; a plurality of valve portions capable of closing the plurality of flow paths respectively; a pressure-receiving portion having flexibility; a first cover portion forming a first space between the first cover portion and the pressure-receiving portion; and a rod portion disposed in the first space, wherein the rod portion pushes the plurality of valve portions in a direction of closing the plurality of flow paths based on displacement of the pressure-receiving portion caused by reduced pressure in the first space.

[0131] According to this configuration, in addition to the same effects as the above-mentioned valve mechanism, a plurality of flow paths can be closed by one rod portion. Therefore, the configuration can be simplified compared to the case where the same number of rod portions as the plurality of valve portions are provided.

[0132] (E) It may also be that the liquid ejection device comprises: the valve mechanism of the above-mentioned structure; a liquid ejection part, which ejects a plurality of liquids; a plurality of flow paths, which supply a plurality of liquids to the liquid ejection part; and a decompression source, wherein the first cover member has a first connecting hole connecting the decompression source and the first space, and the decompression source can decompress the first space via the first connecting hole.

[0133] According to this configuration, the same effects as those of the above-mentioned valve mechanism can be achieved.

[0134] (F) It may also be that the liquid ejection device further comprises: a plurality of liquid chambers, which are arranged between the valve mechanism and the liquid ejection part in the plurality of flow paths, and at least a part of which is composed of a flexible member having flexibility; a plurality of force-applying members, which apply force to the flexible member in a direction in which the volume of the plurality of liquid chambers becomes smaller; a second cover member, which forms a plurality of second spaces between the flexible member at positions corresponding to the plurality of liquid chambers, and is provided with a plurality of second connecting holes for connecting the decompression source with the plurality of second spaces; and an atmosphere connecting member, which can connect the plurality of second spaces with the atmosphere.

[0135] According to this structure, the same effect as the above-mentioned liquid ejecting device can be achieved.

[0136] (G) A control method for a liquid ejection device, the liquid ejection device comprising: a liquid ejection portion ejecting liquid; a flow path supplying the liquid to the liquid ejection portion; a decompression source; a substrate constituting a portion of the flow path; a valve portion capable of closing the flow path; a pressure-receiving portion having flexibility; a first cover member forming a first space between the first cover member and the pressure-receiving portion; a rod portion disposed in the first space; a liquid chamber disposed in the flow path between the valve portion and the liquid ejection portion, at least a portion of which is composed of a flexible member having flexibility; a force-applying member applying force to the flexible member in a direction in which the volume of the liquid chamber becomes smaller; a second cover member forming a second space between the first cover member and the flexible member; and The atmosphere connecting part can connect the second space with the atmosphere, and the control method of the liquid ejection device includes: by reducing the pressure in the second space by the decompression source, the flexible member is displaced in the direction of increasing the volume of the liquid chamber to introduce the liquid into the liquid chamber; by reducing the pressure in the first space by the decompression source, the pressure-bearing part is displaced; based on the displacement of the pressure-bearing part, the rod part pushes the valve part to close a part of the flow path; by connecting the second space with the atmosphere by the atmosphere connecting part, the flexible member is pushed by the force applied by the force-applying member to push the liquid in the liquid chamber toward the liquid ejection part.

[0137] According to this method, the same effect as that of the above-mentioned liquid ejection device can be achieved.

[0138] (H) A control method for a liquid ejection device, the liquid ejection device comprising: a liquid ejection portion ejecting a plurality of liquids; a plurality of flow paths supplying the plurality of liquids to the liquid ejection portion; a decompression source; a substrate constituting a portion of each of the plurality of flow paths; a plurality of valve portions capable of closing the plurality of flow paths; a pressure-receiving portion having flexibility; a first cover member forming a first space between the cover member and the pressure-receiving portion; a rod portion disposed in the first space; a plurality of liquid chambers disposed between the valve portion and the liquid ejection portion in the plurality of flow paths, at least a portion of which is composed of a flexible member having flexibility; a plurality of force-applying members applying force to the flexible member in a direction in which the volume of the plurality of liquid chambers becomes smaller; and a second cover member forming a first space between the cover member and the flexible member at a position corresponding to the plurality of liquid chambers. A plurality of second spaces; and an atmosphere connecting portion that can connect the plurality of second spaces to the atmosphere, the control method of the liquid ejection device comprising: decompressing the plurality of second spaces by the decompression source, thereby causing the flexible member to displace in a direction in which the volume of the plurality of liquid chambers increases and thereby introducing the liquid into the plurality of liquid chambers; decompressing the first space by the decompression source, thereby causing the pressure-bearing portion to displace; based on the displacement of the pressure-bearing portion, causing the rod portion to push the plurality of valve portions to close a portion of each of the plurality of flow paths; connecting the plurality of second spaces to the atmosphere by the atmosphere connecting portion, thereby causing the flexible member to be pushed by the force applied by the plurality of force-applying members to push the liquid in the plurality of liquid chambers toward the liquid ejection portion.

[0139] According to this method, the same effect as that of the above-mentioned liquid ejection device can be achieved.

Claims

1. A valve mechanism, characterized in that: The valve mechanism is provided in the middle of a flow path through which a fluid flows, and the valve mechanism comprises: a substrate constituting a part of the flow path; a valve portion capable of closing the flow path; The pressure-bearing part is flexible; a first cover member, forming a first space between the cover member and the pressure receiving portion; as well as The rod portion is arranged in the first space, The rod portion pushes the valve portion in a direction to close the flow path based on displacement of the pressure receiving portion caused by reduced pressure in the first space.

2. A liquid ejection device, characterized in that: have: The valve mechanism according to claim 1; A liquid ejection part ejects liquid; The flow path supplies the liquid to the liquid ejection portion; and Source of stress relief, The first cover member has a first communication hole for connecting the decompression source with the first space. The decompression source can decompress the first space through the first communication hole.

3. The liquid ejection device according to claim 2, characterized in that: Also available: a liquid chamber provided in the flow path between the valve mechanism and the liquid ejection portion, wherein at least a portion of the liquid chamber is formed of a flexible member having flexibility, A force-applying member, which applies force to the flexible member in a direction in which the volume of the liquid chamber decreases; a second cover member, forming a second space between the cover member and the flexible member, and provided with a second communication hole for connecting the decompression source with the second space; as well as The atmosphere communication portion can communicate the second space with the atmosphere.

4. A valve mechanism, characterized in that: The valve mechanism is provided in the middle of a plurality of flow paths through which a plurality of fluids flow respectively, and the valve mechanism comprises: a substrate constituting a portion of each of the plurality of flow paths; A plurality of valve parts capable of closing the plurality of flow paths respectively; The pressure-bearing part is flexible; a first cover member, forming a first space between the cover member and the pressure receiving portion; as well as The rod portion is arranged in the first space, The rod portion pushes the plurality of valve portions in a direction of closing the plurality of flow paths based on displacement of the pressure receiving portion caused by reduced pressure in the first space.

5. A liquid ejection device, characterized in that: have: The valve mechanism according to claim 4; A liquid ejection part ejects a variety of liquids; The plurality of flow paths supply the plurality of liquids to the liquid ejection portion; as well as Source of reduced pressure, The first cover member has a first communication hole that communicates the decompression source with the first space. The decompression source can decompress the first space through the first communication hole.

6. The liquid ejection device according to claim 5, characterized in that: Also available: A plurality of liquid chambers are provided between the valve mechanism and the liquid ejection portion in the plurality of flow paths, and at least a portion of each of the liquid chambers is formed of a flexible member having flexibility; A plurality of force-applying members, applying force to the flexible member in a direction in which the volume of the plurality of liquid chambers decreases; A second cover member, at positions corresponding to the plurality of liquid chambers, forms a plurality of second spaces between the cover member and the flexible member, and is provided with a plurality of second communication holes for connecting the decompression source with the plurality of second spaces; as well as The atmosphere communication portion can communicate the plurality of second spaces with the atmosphere.

7. A method for controlling a liquid ejection device, characterized in that: The liquid ejection device comprises: A liquid ejection part ejects liquid; a flow path for supplying the liquid to the liquid ejection portion; Source of stress relief; a substrate constituting a part of the flow path; a valve portion capable of closing the flow path; The pressure-bearing part is flexible; a first cover member, forming a first space between the cover member and the pressure receiving portion; a rod portion, disposed in the first space; a liquid chamber provided in the flow path between the valve portion and the liquid ejection portion, wherein at least a portion of the liquid chamber is formed of a flexible member having flexibility; A force-applying member, which applies force to the flexible member in a direction in which the volume of the liquid chamber decreases; a second cover member, forming a second space between the cover member and the flexible member; as well as The atmosphere communication portion is capable of communicating the second space with the atmosphere, The control method of the liquid ejection device comprises: The second space is decompressed by the decompression source, so that the flexible member is displaced in a direction in which the volume of the liquid chamber increases, so as to introduce the liquid into the liquid chamber; The pressure receiving portion is displaced by reducing the pressure in the first space through the pressure reducing source; Based on the displacement of the pressure receiving portion, the rod portion pushes the valve portion to close a portion of the flow path; and The second space is communicated with the atmosphere through the atmosphere communication portion, so that the flexible member is pressed by the urging force of the urging member, thereby pushing the liquid in the liquid chamber toward the liquid ejection portion.

8. A method for controlling a liquid ejection device, characterized in that: The liquid ejection device comprises: A liquid ejection part ejects a variety of liquids; A plurality of flow paths for supplying a plurality of liquids to the liquid ejection portion; Source of stress relief; a substrate constituting a portion of each of the plurality of flow paths; a plurality of valve portions capable of closing a plurality of the flow paths; The pressure-bearing part is flexible; a first cover member, forming a first space between the cover member and the pressure receiving portion; A rod portion, disposed in the first space; A plurality of liquid chambers are provided between the valve portion and the liquid ejection portion in the plurality of flow paths, and at least a portion of each of the liquid chambers is formed of a flexible member having flexibility; A plurality of force-applying members, applying force to the flexible member in a direction in which the volume of the plurality of liquid chambers decreases; A second cover member, at positions corresponding to the plurality of liquid chambers, forming a plurality of second spaces between the second cover member and the flexible member; as well as The atmosphere communication part can communicate the plurality of the second spaces with the atmosphere, The control method of the liquid ejection device comprises: The liquid is introduced into the plurality of liquid chambers by decompressing the plurality of second spaces with the decompression source so that the flexible member is displaced in a direction in which the volume of the plurality of liquid chambers increases; The pressure receiving portion is displaced by reducing the pressure in the first space through the pressure reducing source; Based on the displacement of the pressure receiving portion, the rod portion pushes the plurality of valve portions to close a portion of each of the plurality of flow paths; and The plurality of second spaces are connected to the atmosphere through the atmosphere communication portion, so that the flexible member is pressed by the urging force of the plurality of urging members, thereby pushing the liquid in the plurality of liquid chambers toward the liquid ejection portion.

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