Liquid discharge device

Abstract

To provide a liquid discharge device that is configured to be able to suppress color materials in liquid from settling out, without inhibiting liquid from circularly flowing.SOLUTION: A liquid discharge device 1 is provided with a plurality of nozzles 5 that discharges liquid; a plurality of pressure chambers 52 communicating with the plurality of nozzles 5; a common supply path 30 connected to a plurality of individual supply paths 51 communicating with the plurality of pressure chambers 52; a common recovery path 40 connected to the plurality of individual recovery paths 53 communicating with the plurality of pressure chambers 52; and a sheet-like filter member 61. The filter member 61 has: a filter part 70, positioned at the middle of the common supply path 40, which allows liquid to pass therethrough and captures foreign matters in liquid; an extended part 72 with flexibility positioned at the middle of the common recovery path 40 and extended from wall surfaces 41a and 41b of the common recovery path 40 toward a center of the passing of the liquid; and an opening part 73, surrounded by the extended part 72, through which liquid flowing through the common recovery path 40 is passed.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a liquid ejection device that ejects liquid. [Background technology]

[0002] A known conventional liquid ejection device has a liquid circulating configuration, as described in Patent Document 1, for example. The liquid ejection head of this liquid ejection device includes a plurality of nozzles, pressure chambers communicating with each nozzle, and individual supply flow paths and individual recovery flow paths communicating with each pressure chamber. Liquid supplied from a supply tank via the individual supply flow paths to the pressure chambers is ejected from the nozzles when ejection pressure is applied in the pressure chambers. The remaining liquid not ejected from the nozzles is recovered from the pressure chambers via the individual recovery flow paths to a recovery tank, and the liquid in the recovery tank is returned to the supply tank by a pump.

[0003] Furthermore, a common supply flow path including one main stream and multiple tributaries is provided between the supply tank and the multiple individual supply flow paths. Liquid from the supply tank enters the main stream from a supply port, then branches into multiple tributaries and flows, and is then supplied to the multiple individual supply flow paths connected to each tributary. Similarly, a common recovery flow path including one main stream and multiple tributaries is provided between the recovery tank and the multiple individual recovery flow paths. Liquid from each individual recovery flow path joins in each tributary, then joins again in the main stream, and is then recovered in the recovery tank via the recovery port.

[0004] The liquid ejection head of Patent Document 1 further includes a damper member. The damper member covers the upper portion of the supply-side tributary stream and the upper portion of the recovery-side tributary stream, and the portions covering each tributary stream form displaceable wall surfaces. The damper member also has portions interposed in the middle of the supply-side main stream and the middle of the recovery-side main stream, which form filters that capture foreign matter in the liquid flowing in each main stream. In this way, one damper member fulfills two functions: damping and filtering. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-151941 Summary of the Invention [Problem to be solved by the invention]

[0006] However, as described above, the liquid ejection head of Patent Document 1 has filters provided in both the supply-side flow path, which is upstream of the nozzle, and the recovery-side flow path, which is downstream of the nozzle. In this case, when air bubbles enter from the nozzle, the air bubbles move toward the recovery side along the flow of the liquid, but are held back by the recovery-side filter and accumulate in front of the filter. This causes the accumulated air bubbles to clog the filter, hindering the circulation of the liquid, resulting in the problem of pigments and other coloring materials contained in the liquid settling.

[0007] Therefore, an object of the present disclosure is to provide a liquid ejection device that can prevent the coloring material in the liquid from settling without impeding the circulating flow of the liquid. [Means for solving the problem]

[0008] A liquid ejection device according to a first aspect of the present disclosure comprises a plurality of nozzles for ejecting liquid, a plurality of pressure chambers each communicating with a plurality of the nozzles, a common supply path connected to a plurality of individual supply paths communicating with the plurality of pressure chambers, a common recovery path connected to a plurality of individual recovery paths communicating with the plurality of pressure chambers, and a sheet-like filter member, wherein the filter member has a filter portion located midway along the common supply path to allow the liquid to flow and to capture foreign matter in the liquid, a flexible extension portion located midway along the common recovery path and extending from the wall of the common recovery path toward the center of flow, and an opening portion surrounded by the extension portion to pass the liquid flowing through the common recovery path. [Effects of the Invention]

[0009] In the liquid ejection device according to the present disclosure, the common recovery path does not have a filter, and the extension portion extending from the wall surface of the common recovery path oscillates due to the circulating flow of the liquid, thereby agitating the liquid in the common recovery path without impeding the circulation of the liquid, thereby preventing the settling of the colorant in the liquid. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of a liquid ejection device. [Figure 2] FIG. 2 is a schematic diagram showing, in plan view, a part of a liquid flow path formed inside the ejection head, indicated by a broken line. [Figure 3] FIG. 3 is a cross-sectional view of the ejection head taken along the line AA in FIG. [Figure 4] FIG. 4 is a cross-sectional view of the ejection head taken along the line BB in FIG. [Figure 5] FIG. 5 is a cross-sectional view of the ejection head taken along the CC arrow in FIG. [Figure 6] FIG. 6 is a schematic perspective view showing a flow path through which ink is supplied to the nozzles and a flow path through which ink is collected from the nozzles. [Figure 7] FIG. 7A is a schematic diagram showing the configuration of a filter member, FIG. 7B is a schematic diagram showing the configuration of a filter member according to Modification 1, and FIG. 7C is a schematic diagram showing the configuration of a filter member according to Modification 2. DETAILED DESCRIPTION OF THE INVENTION

[0011] A liquid ejection device according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the concept of direction used in the following description is used for convenience of explanation and does not limit the orientation of each disclosed configuration to that direction. Furthermore, the liquid ejection device described below is merely one embodiment of the present disclosure. Therefore, the present disclosure is not limited to the following embodiment, and additions, deletions, or modifications to the configuration are possible within the scope of the disclosure.

[0012] [Overall configuration of liquid ejection device] 1 is a schematic diagram of a liquid ejection device 1. The liquid ejection device 1 is, for example, a serial head type printing device, which alternates between a process of forming an image by ejecting ink while a ejection head 2 moves in a scanning direction, and a process of transporting a recording medium M such as paper in a transport direction perpendicular to the scanning direction.

[0013] 1 is an example, and the liquid ejection device according to the present disclosure is not limited to this configuration. For example, instead of the serial head configuration, a line head configuration may be adopted as the liquid ejection device 1. In the case of a line head configuration, the ejection head has a plurality of nozzles arranged across the entire width of the printing area or more, and is provided in a fixed position without moving in the scanning direction.

[0014] The ejection head 2 is housed in a housing 3 provided in the liquid ejection device 1, and is provided with a plurality of nozzles 5 each having an opening 4 for ejecting ink (see FIG. 2). The ejection head 2 is provided with a drive element for each of the plurality of nozzles 5. The drive element is a piezoelectric element, a heat generating element, an electrostatic actuator, or the like, and when driven, applies pressure to the ink in the ejection head 2 to eject ink from the corresponding nozzle 5.

[0015] The liquid ejection device 1 includes a platen 6 disposed opposite the ejection head 2. The platen 6 is positioned below the ejection head 2 at a predetermined distance, and supports the recording medium M from below on its flat upper surface.

[0016] The liquid ejection device 1 includes a transport device 7 that transports the recording medium M on the platen 6. The transport device 7 includes, for example, two transport rollers 8 and a transport motor. The two transport rollers 8 are arranged at a distance in the transport direction with the platen 6 sandwiched between them, and are connected to the rotary shaft of the transport motor via a reducer. Therefore, when the transport motor is driven, the two transport rollers 8 rotate about their axes, transporting the recording medium M on the platen 6 in the transport direction. Note that the liquid ejection device 1 may include a mechanism that moves the platen 6 itself in the transport direction, instead of the two transport rollers 8. In this case, the recording medium M is transported together with the platen 6 while being supported by the platen 6.

[0017] The liquid ejection device 1 includes a scanning device 10 that moves the ejection head 2 in a scanning direction. The scanning device 10 includes a carriage 11, two guide rails 12, an endless belt 13, and a scanning motor. The carriage 11 is a housing that supports the ejection head 2. The two guide rails 12 extend in the scanning direction so as to cross the platen 6, and are arranged apart in the transport direction so as to sandwich the ejection head 2 therebetween. The two guide rails 12 support the carriage 11 so that it can move in the scanning direction.

[0018] The endless belt 13 is wound around two pulleys 14 provided near both ends of one of the guide rails 12, and is connected to the carriage 11 at a predetermined location. The scanning motor has a rotation shaft connected to one of the pulleys 14 via a reducer. Therefore, in this scanning device 10, when the scanning motor is driven to rotate, the endless belt 13 runs, and the carriage 11 supporting the discharge head 2 moves in the scanning direction along the guide rail 12.

[0019] The liquid ejection device 1 includes a supply tank 15 that stores ink to be supplied to the ejection head 2, and the ink from the supply tank 15 is sent to the ejection head 2 through a supply tube 16. Note that, although an example including only one set of the supply tank 15 and the supply tube 16 is shown in Fig. 1, this is not limiting. For example, if the liquid ejection device 1 ejects ink of multiple colors, the liquid ejection device 1 includes the supply tanks 15 and the supply tubes 16 in numbers corresponding to the types of ink colors.

[0020] The liquid ejection device 1 is equipped with a recovery tank 17 that recovers ink that has been sent from the supply tank 15 to the ejection head 2 but has not been ejected from the nozzles 5. This recovery tank 17 and the ejection head 2 are connected by a recovery tube 18. In addition, a suction pump 19 is connected to the recovery tank 17. Therefore, when the suction pump 19 is driven and negative pressure is generated in the recovery tank 17, this negative pressure causes ink to be sucked from the ejection head 2 through the recovery tube 18 into the recovery tank 17 and recovered.

[0021] The recovery tank 17 and the supply tank 15 are connected by a circulation tube 20, and a circulation pump 21 is provided midway along the circulation tube 20. When the circulation pump 21 is driven, the ink in the recovery tank 17 is sent to the supply tank 15 through the circulation tube 20. As described above, if the liquid ejection device 1 is provided with a plurality of supply tanks 15, the recovery tanks 17 and recovery tubes 18 may also be provided in the same number as the supply tanks 15. However, if the suction pump 19 and the circulation pump 21 are configured so that their connections can be switched using a separate switching valve or the like, it is not necessary to provide multiple pumps for one or both of these.

[0022] [Detailed configuration of the discharge head] Next, the configuration of the ejection head 2 will be described in detail. Fig. 2 is a schematic plan view of the ejection head 2, showing by dashed lines some of the liquid flow paths formed inside (the common supply path 30 and the common recovery path 40). Fig. 3 is a cross-sectional view of the ejection head 2 taken along the line AA in Fig. 2, Fig. 4 is a cross-sectional view of the ejection head 2 taken along the line BB in Fig. 2, and Fig. 5 is a cross-sectional view of the ejection head 2 taken along the line CC in Fig. 2. Fig. 6 is a schematic perspective view showing the flow paths through which ink is supplied to the nozzles 5 and the flow paths through which ink is recovered from the nozzles 5.

[0023] In describing the configuration of the ejection head 2, a first direction, a second direction, and a third direction are defined as shown in Figures 2 to 5. These three directions are perpendicular to one another, and in this embodiment, the first direction is the transport direction, the second direction is the scanning direction, and the third direction is the up-down direction. However, the directions may be set differently.

[0024] As shown in FIG. 2, the ejection head 2 has a common supply channel 30 and a common recovery channel 40. The common supply channel 30 includes a common main supply channel 31, which is, for example, a single channel extending along a first direction, and multiple common branch supply channels 32 extending from the common main supply channel 31 in one direction in a second direction. Adjacent common branch supply channels 32 are positioned at predetermined intervals in the first direction. The ejection head 2 is provided with a supply port 33 that communicates with the downstream end of the supply tube 16, and the supply port 33 is connected to the common main supply channel 31. Therefore, ink supplied from the supply tank 15 via the supply tube 16 enters the common main supply channel 31 and is then divided and supplied to each of the multiple branch common supply channels 32.

[0025] The common recovery channel 40 includes a common main recovery channel 41, which is, for example, a single channel extending in the first direction parallel to the common supply channel 30, and multiple common tributary recovery channels 42 extending from the common main recovery channel 41 in the other direction, the second direction. Adjacent common tributary recovery channels 42 are positioned at predetermined intervals in the first direction. The ejection head 2 is provided with a recovery port 43 that communicates with the upstream end of the recovery tube 18, and the recovery port 43 is connected to the common main recovery channel 41. Therefore, ink from each of the common tributary recovery channels 42 joins together in the common main recovery channel 41 and is recovered from the recovery port 43 via the recovery tube 18 to the recovery tank 17.

[0026] 2, the common supply channel 30 is formed in a comb-tooth shape by one common supply main channel 31 and multiple common supply tributary channels 32, and the common recovery channel 40 is also formed in a comb-tooth shape by one common recovery main channel 41 and multiple common recovery tributary channels 42. The common supply and recovery tributary channels 32 and 42 are arranged so that one common recovery tributary channel 42 is located between two adjacent common supply tributary channels 32, 32, in other words, the common supply and recovery tributary channels 32 and 42 are arranged alternately along the first direction.

[0027] As shown in Fig. 6, a plurality of individual flow paths 50 corresponding to the respective nozzles 5 are provided along the second direction between an adjacent set of common supply tributary flow path 32 and common recovery tributary flow path 42. Note that for better visibility, Fig. 6 shows only one set of common supply tributary flow path 32 and common recovery tributary flow path 42 and one individual flow path 50.

[0028] 6, the individual flow path 50 has an individual supply path 51, a pressure chamber 52, an individual recovery path 53, and a nozzle 5. The individual supply path 51 extends from the common supply branch path 32 in one direction (downward) in the third direction and is connected to one end of the pressure chamber 52 so as to communicate with the other end of the pressure chamber 52. The individual recovery path 53 is connected to communicate with the other end of the pressure chamber 52, and extends in the other direction (upward) in the third direction and is connected to the common recovery branch path 42. In addition, a nozzle 5 is provided below the pressure chamber 52, and the pressure chamber 52 and the nozzle 5 are in communication with each other.

[0029] As shown in Figures 3 to 5, the ejection head 2 is composed of a thick plate-shaped frame member 60, a sheet-shaped filter member 61, a plate-shaped flow path member 62, a plate-shaped pressure chamber member 63, and a thin plate-shaped nozzle member 64 joined in this order in a third direction.

[0030] The frame member 60 is formed with a groove 60a that forms part (upper portion) of the common supply main channel 31 and a groove 60b that forms part (upper portion) of the common recovery main channel 41. The grooves 60a and 60b are concave grooves that are recessed upward from the lower surface of the frame member 60 and are elongated in the first direction. A through-hole 60c that penetrates in the third direction (up-down direction) is provided midway through the groove 60a in the first direction, and this through-hole 60c forms the supply port 33 described above. A through-hole 60d that penetrates in the third direction (up-down direction) is provided midway through the groove 60b in the first direction, and this through-hole 60d forms the recovery port 43 described above.

[0031] The flow path member 62 is formed with a groove 62a that forms the remaining portion (lower portion) of the common supply main flow path 31 and a groove 62b that forms the remaining portion (lower portion) of the common recovery main flow path 41. The grooves 62a and 62b are concave grooves that are recessed downward from the upper surface of the flow path member 62 and are elongated in the first direction. Note that the positions of one end and the other end of the grooves 60a and 62a in the first direction coincide (see FIG. 4), and similarly, the positions of one end and the other end of the grooves 60b and 62b in the first direction coincide (see FIG. 5).

[0032] Furthermore, the flow path member 62 is formed with a groove 62c that forms the common supply tributary flow path 32 (see FIG. 4), and with a groove 62d that forms the common recovery tributary flow path 42 (see FIGS. 3 and 5). Groove 62c and groove 62d are concave grooves that are recessed downward from the upper surface of the flow path member 62, and are elongated in the second direction. Groove 62c is connected at its end to groove 62a, and groove 62d is connected at its end to groove 62b. These grooves 62c and grooves 62d are positioned alternately one by one along the first direction.

[0033] Each of the grooves 62a, 62b, 62c, and 62d formed in the flow path member 62 described above opens upward on the upper surface of the common flow path member 62 and has a bottom surface. A plurality of through holes 62e are formed in the flow path member 62, penetrating between the bottom surface of the groove 62c and the lower surface of the flow path member 62 and forming individual supply paths 51 (see FIG. 6). A plurality of through holes 62f are formed in the flow path member 62, penetrating between the bottom surface of the groove 62d and the lower surface of the flow path member 62 and forming individual recovery paths 53 (see FIG. 6).

[0034] A plurality of cavities (recesses or holes) 63a that form the pressure chambers 52 are formed in the pressure chamber member 63 (see FIG. 6). The cavities 63a are connected at their lower ends to the above-mentioned through holes 62e and 62f. Furthermore, a plurality of through holes 64a that form nozzles 5 are formed in the nozzle member 64 corresponding to the plurality of pressure chambers 52 (see FIG. 6).

[0035] The above-described frame member 60, flow path member 62, pressure chamber member 63, and nozzle member 64 may be configured as a single member or may be configured by joining a plurality of members. For example, one or more of the frame member 60, flow path member 62, pressure chamber member 63, and nozzle member 64 may be configured by joining a plurality of plate-shaped members in the third direction.

[0036] A filter member 61 is provided between the frame member 60 and the flow path member 62. The filter member 61 is sheet-shaped, and when viewed from the third direction, has an area that includes all of the grooves 62a, 62b, 62c, and 62d formed in the flow path member 62. The filter member 61 is made of a polyimide resin having a thickness of, for example, 10 to 20 μm, but is not limited to this.

[0037] Figures 7A to 7C are schematic diagrams showing variations in the configuration of the filter member 61, and show the configuration as seen from the direction of arrow DD in Figure 3. Of these, Figure 7A shows the configuration of the filter member 61 provided in the ejection head 2 illustrated in Figures 3 to 5, and Figures 7B and 7C show modified filter members 61A and 61B.

[0038] The filter member 61 is sandwiched between the frame member 60 and the flow path member 62, and therefore has a portion located midway along the common supply path 30 (particularly, the common main supply path 31) and a portion located midway along the common recovery path 40 (particularly, the common main recovery path 41). As shown in Fig. 7A, the portion located midway along the common main supply path 31 forms a filter portion 70, and the portion located midway along the common main recovery path 41 forms a stirring portion 71.

[0039] The filter portion 70 has a cross-sectional shape and area that are approximately the same as the cross-sectional shape and area when the common main supply channel 31 is cut along a plane perpendicular to the third direction. The filter portion 70 has a plurality of small-diameter through-holes formed therein, and has a filtering function that allows ink to flow through and captures foreign matter in the ink.

[0040] The stirring portion 71 is provided in approximately the same area as a cross section of the common main recovery channel 41 taken along a plane perpendicular to the third direction. The stirring portion 71 has a flexible extension portion 72 that extends from the wall surfaces 41a, 41b (see FIGS. 3 and 5) that define the common main recovery channel 41 toward the flow center of the common main recovery channel 41. Furthermore, the stirring portion 71 has an opening portion 73 that is surrounded by the extension portion 72 and allows ink flowing in the common main recovery channel 41 to pass through.

[0041] In this stirring portion 71, the opening portion 73 allows ink to pass through, while the extension portion 72 oscillates due to the flow of ink. This allows the liquid ejection device 1 to stir the ink in the common main recovery channel 41 without impeding the circulation of ink, thereby preventing the coloring material in the ink from settling.

[0042] 7A, the extension portion 72 has a longitudinal extension portion 72a extending from a wall surface 41a along the longitudinal direction (first direction) of the common recovery main channel 41. The extension portion 72 also has a lateral extension portion 72b extending from a wall surface 41b along the lateral direction (second direction) of the common recovery main channel 41. That is, the extension portion 72 is frame-shaped by a pair of longitudinal extension portions 72a and a pair of lateral extension portions 72b, and an opening portion 73 is formed in the center thereof.

[0043] 3, when the dimension of the common main recovery channel 41 in the second direction is L1, the extension length L2 of the longitudinally extending portion 72a can be set, for example, in the range of L1 > L2 ≥ 0.1 * L1, and can be suitably selected from the range of 0.2 * L1 ≥ L2 ≥ 0.1 * L1. In actual size, the extension length L2 of both the longitudinally extending portion 72a and the lateral extending portion 72b is 1 mm or less, and more preferably 0.1 to 0.2 mm.

[0044] Furthermore, when the opening diameter (diameter) of the opening 4 of the nozzle 5 is Φ1 (see FIG. 6) and the minimum opening dimension of the opening portion 73 of the stirring section 71 is Φ2 (see FIG. 3), it is preferable to set Φ1≦Φ2. This allows air bubbles entering from the nozzle 5 to pass through the opening portion 73 and be collected.

[0045] Such agitating portion 71 can be formed as follows. First, a sheet-like filter member 61 without openings 73 is attached to the lower surface of the frame member 60. Next, a laser is irradiated onto the attached filter member 61 to form openings 73. Then, a flow path member 62 is attached to the lower surface of the filter member 61. This forms the agitating portion 71 having the extension portion 72 extending from the wall surface 41a and the openings 73. However, the method for forming the agitating portion 71 is not limited to this, and it may be formed by other methods.

[0046] [Variation 1] A filter member 61A shown in Fig. 7B can be used in place of the filter member 61 in the discharge head 2 of the liquid discharger 1. The agitation section 71A of this filter member 61A has an extension portion 72 having a bridging portion 72c that connects one wall surface 41a and the other wall surface 41a that face each other. In the example of Fig. 7B, the bridging portion 72c partially connects between the two longitudinally extending portions 72a that face each other in the second direction, and is located near the center of the common main recovery channel 41 in the first direction. The other configuration of the filter member 61A is the same as that of the filter member 61 described above.

[0047] Such an bridging portion 72c oscillates near the center in the width direction of the flow path of the common main recovery flow path 41. Therefore, the long extension portion 72a, the short extension portion 72b, and the bridging extension portion 72c can agitate ink over a wide range of the flow path cross section of the common main recovery flow path 41, and can suppress settling of the coloring material.

[0048] [Variation 2] A filter member 61B shown in FIG. 7C can be used in place of the filter member 61 in the ejection head 2 of the liquid ejection device 1. The agitating portion 71B of this filter member 61B has a plurality of bridging portions 72c. Specifically, in the example of FIG. 7C, three bridging portions 72c are arranged at equal intervals along the first direction. The other configuration of the filter member 61B is the same as that of the filter member 61A described above.

[0049] In this way, the multiple bridge portions 72c oscillate near the center of the width direction of the common main recovery channel 41 at multiple locations in the first direction of the channel. Therefore, it is possible to agitate the ink over a wider range than in Modification 1, and to suppress settling of the coloring material. Note that when the bridge portions 72c are provided as in Modifications 1 and 2, the opening dimension Φ2 of the opening portion 73 may become small, but by making Φ1≦Φ2 as described above, it is possible to recover air bubbles that have entered from the nozzles 5.

[0050] [Other configurations] In the above example, the extending portion 72 includes both the longitudinal extending portion 72a and the lateral extending portion 72b, but this is not limiting. For example, the extending portion 72 may include only the longitudinal extending portion 72a or only the lateral extending portion 72b. Furthermore, although the longitudinal extending portion 72a is illustrated as extending from both of the opposing wall surfaces 41a, it may be configured to extend from only one of the wall surfaces 41a. Similarly, although the lateral extending portion 72b is illustrated as extending from both of the opposing wall surfaces 41b, it may be configured to extend from only one of the wall surfaces 41b.

[0051] Furthermore, although a frame-like extension portion 72 has been exemplified, it may instead be configured to be separated in the circumferential direction. For example, a slit may be made in the longitudinal extension portion 72a midway in the first direction in the second direction, separating it into a portion on one side in the first direction and a portion on the other side in the first direction. The same applies to the lateral extension portion 72b. Alternatively, a slit may be made at the boundary between the longitudinal extension portion 72a and the lateral extension portion 72b, separating them.

[0052] In the above example, the cross-sectional shape of the common main recovery channel 41 and the opening 73 are similar, but this is not limiting. For example, the contour of the opening 73 may be a sine wave or rectangular wave rather than a straight line, and the extension dimension from the wall surfaces 41 a, 41 b may not be uniform.

[0053] 7B and 7C, the bridge portion 72c and the recovery port 43 are positioned so as to partially overlap when viewed from the third direction. By arranging the bridge portion 72c at least partially on the recovery port 43 in this manner, the bridge portion 72c can be more reliably oscillated by the flow of ink toward the recovery port 43, and the ink can be stirred more efficiently. [Industrial Applicability]

[0054] The present disclosure can be suitably applied to a liquid ejection device that ejects liquid. [Explanation of symbols]

[0055] 1 Liquid discharge device 2 Discharge head 5 nozzles 30 Common supply route 31 Common supply main channel 32 Common supply tributary channel 40 Common collection route 41 Common recovery main channel 42 Common collection tributary 51 Individual supply route 52 Pressure Chamber 53 Individual collection route 61 Filter member 70 Filter part 71 Stirring part 72 Extension part 72c Erection part 73 Opening part

Claims

1. a plurality of nozzles for ejecting liquid; a plurality of pressure chambers communicating with the plurality of nozzles, respectively; a common supply channel connected to a plurality of individual supply channels communicating with a plurality of pressure chambers; a common recovery path connected to a plurality of individual recovery paths communicating with a plurality of pressure chambers; a sheet-like filter member, The filter member is a filter portion located in the common supply path to allow the liquid to flow and to capture foreign matter in the liquid; a flexible extension portion located midway along the common recovery path and extending from a wall surface of the common recovery path toward a flow center; an opening portion surrounded by the extension portion and through which liquid flows in the common recovery path; Liquid discharge device.

2. the common recovery channel has a plurality of common recovery tributary channels and a common main recovery channel into which liquid from the plurality of common recovery tributary channels joins and which is long in a predetermined direction; the extension portion is located midway along the common main recovery channel and extends from a wall surface along the longitudinal direction of the common main recovery channel. The liquid ejection device according to claim 1 .

3. the common recovery channel has a plurality of common recovery tributary channels and a common main recovery channel into which liquid from the plurality of common recovery tributary channels joins and which is long in a predetermined direction; the extension portion is located midway along the common main recovery channel and extends from a wall surface along a short direction of the common main recovery channel. The liquid ejection device according to claim 1 .

4. the extension portion has a bridge portion connecting a part of one wall surface and a part of the other wall surface of the common recovery path that face each other, The liquid ejection device according to claim 1 .

5. The opening diameter of the opening portion is larger than the opening diameter of the nozzle. The liquid ejection device according to claim 1 .

6. The filter member is made of resin. The liquid ejection device according to claim 1 .

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