Liquid discharge device

Abstract

To provide a liquid discharge device capable of suppressing cohesion of liquid in the vicinity of a damper portion of a sheet member.SOLUTION: A liquid discharge device comprises: a nozzle member 64 in which a plurality of nozzles 5 for discharging liquid are formed; a pressure chamber member 63 in which a plurality of pressure chambers 52 are formed, the plurality of pressure chambers respectively communicating with the plurality of nozzles 5; a flow passage member 62 in which common passages 32 and 42 are formed, connected to a plurality of individual passages 50 that communicate with the plurality of pressure chambers 52; a sheet member 61 laminated onto the flow passage member 62 and bonded by an adhesive 80, the sheet member having a flexible damper portion 61d that covers at least part of the common passages 32 and 42; and a restraint member 70 laminated on a side opposite to the flow passage member 62 with respect to the sheet member 61. The restraint member 70 includes an extended portion 73 that extends inward from edges 32e and 42e of openings of the common passages 32 and 42, which are covered by the damper portion 61d, as viewed along a laminating direction of the sheet member 61 and the restraining member 70.SELECTED DRAWING: Figure 8

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 configuration with a damper function, as described in Patent Document 1, for example. In the liquid ejection head of this liquid ejection device, liquid is supplied to a common liquid chamber (25), individual communication paths (26), pressure chambers (30), and nozzles (22) in that order, and the liquid is ejected from the nozzles. A sealing film (49) that forms a damper is provided to define a portion of the common liquid chamber, and this sealing film (49) is sandwiched and fixed between a communication substrate (24) and a fixed substrate (50). It is disclosed that the sealing film and the communication substrate are joined with an epoxy adhesive (54). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-008130 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the inventors of the present application have discovered that pigment components of the pigment ink aggregate near the damper in liquid ejection heads such as those described in Patent Document 1. If aggregation occurs in the common liquid chamber, this aggregate can undesirably cause nozzle clogging or filter clogging.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present disclosure to provide a liquid ejection device that can suppress aggregation of liquid near a damper. [Means for solving the problem]

[0006] The inventors of the present application have conducted extensive research and have obtained the following new findings. Specifically, in a configuration in which a sealing film and a communicating substrate are bonded with an adhesive, as in Patent Document 1, a portion of the adhesive between the sealing film and the communicating substrate may protrude into the common liquid chamber and form a fillet. As a result, as the sealing film repeatedly deforms as a damper, it repeatedly comes into contact with the fillet-shaped adhesive, generating static electricity, which may cause coloring materials such as ink pigments to aggregate. The present disclosure presents the following solutions to solve this newly discovered problem.

[0007] A liquid ejection device according to a first aspect of the present disclosure comprises a nozzle member having a plurality of nozzles formed therein for ejecting liquid, a pressure chamber member having a plurality of pressure chambers formed therein that communicate with each of the plurality of nozzles, a flow path member having a common path connected to a plurality of individual paths that communicate with the plurality of pressure chambers, a sheet member having a flexible damper portion that is laminated on the flow path member and bonded with an adhesive to cover at least a portion of the common path, and a restraint member laminated on the sheet member opposite the flow path member, wherein the restraint member has an extension portion that extends inward from the edge of the opening of the common path that is covered by the damper portion when viewed along the stacking direction of the sheet member and the restraint member. [Effects of the Invention]

[0008] According to the liquid ejection device of the present disclosure, the extension of the restraint member can suppress deformation of the peripheral edge of the damper portion of the sheet member, thereby suppressing aggregation of the liquid even if the adhesive overflows in a fillet shape. [Brief explanation of the drawings]

[0009] [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] 7A and 7B are schematic plan views for explaining the restraining member, in which FIG. 7A shows the stacking state of the sheet member and the flow path member, and FIG. 7B shows the stacking state of the sheet member, the flow path member, and the restraining member. [Figure 8] FIG. 8 is a schematic cross-sectional view showing a stacking state of a frame member, a restraining member, a sheet member, and a flow path member. DETAILED DESCRIPTION OF THE INVENTION

[0010] A liquid ejection device according to an embodiment of the present disclosure will be described below 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.

[0011] [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.

[0012] 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.

[0013] 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. 6). 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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. In the liquid ejection device 1 according to this embodiment, the ink stored in the supply tank 15 and ejected from the nozzles 5 is, for example, a liquid containing a coloring material made of a polymer. Note that while FIG. 1 shows an example in which only one pair of the supply tank 15 and the supply tube 16 is provided, this is not limiting. For example, if the liquid ejection device 1 ejects ink of multiple colors, the liquid ejection device 1 includes multiple supply tanks 15 and supply tubes 16 corresponding to the types of ink colors.

[0019] 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.

[0020] 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.

[0021] [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.

[0022] 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.

[0023] As shown in FIG. 2, the ejection head 2 has a common supply channel 30 and a common recovery channel 40, both of which form a "common channel." 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.

[0024] 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.

[0025] 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.

[0026] As shown in Fig. 6, a plurality of individual channels 50 corresponding to each of the plurality of nozzles 5 are provided along the second direction between adjacent pairs of common supply tributary channels 32 and common recovery tributary channels 42. For better visibility, Fig. 6 only shows two pairs of common supply tributary channels 32 and common recovery tributary channels 42 and two individual channels 50.

[0027] 6, the individual channel 50 has an individual supply channel 51, a pressure chamber 52, an individual recovery channel 53, and a nozzle 5. The individual supply channel 51 extends from the common supply branch channel 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 channel 53 is connected to communicate with the other end of the pressure chamber 52, extends in the other direction (upward) in the third direction, and is connected to the common recovery branch channel 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.

[0028] 3 to 5, the ejection head 2 is configured by joining a thick plate-shaped frame member 60, a film-shaped sheet member 61, a plate-shaped flow path member 62, a plate-shaped pressure chamber member 63, and a thin plate-shaped nozzle member 64 in this order in a third direction. In addition, a restraining member 70 is provided between the frame member 60 and the sheet member 61.

[0029] 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.

[0030] 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).

[0031] 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.

[0032] 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 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).

[0033] 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 through holes 62e that form the individual supply paths 51 and through holes 62f that form the individual recovery paths 53. 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). Each of the plurality of nozzles 5 is connected to a corresponding pressure chamber 52.

[0034] 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.

[0035] A sheet member 61 is provided between the frame member 60 and the flow path member 62. The sheet member 61 is in the form of a film, 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 sheet member 61 is made of a polyimide resin having a thickness of, for example, 10 to 20 μm, but is not limited to this.

[0036] The sheet member 61 is bonded to at least the flow path member 62 with an adhesive, and has a flexible damper portion 61d that covers at least a portion of the common path (in this embodiment, one or both of the common supply tributary flow path 32 and the common recovery tributary flow path 42). The ejection head 2 according to this embodiment is further provided with a restraining member 70 that restrains (limits) deformation of a portion of the damper portion 61d of the sheet member 61. Note that in FIG. 6, the position of the sheet member 61 is indicated by a two-dot chain line. As can be seen from this, the common supply main flow path 31 is made up of a groove 60a above the sheet member 61 and a groove 62a below the sheet member 61, and the common recovery main flow path 41 is made up of a groove 60b above the sheet member 61 and a groove 62b below the sheet member 61.

[0037] [Regarding restraining members] Next, the restraining member 70 provided in the discharge head 2 will be described in further detail. Fig. 7A is a schematic plan view showing the stacking state of the sheet member 61 and the flow path member 62 in the discharge head 2. Fig. 7B is a schematic plan view showing the stacking state when the restraining member 70 is further stacked on the stack of the sheet member 61 and the flow path member 62. Fig. 8 is a schematic cross-sectional view showing the stacking state of the frame member 60, the restraining member 70, the sheet member 61, and the flow path member 62. Note that Fig. 8 is a cross-section taken along line D1-D1 in Fig. 7B, and shows the configuration of region D2 indicated by the rectangular dashed line in Fig. 4.

[0038] 7A, sheet member 61 has an area overlapping substantially the entire upper surface of flow path member 62. Sheet member 61 has connection portion 61a, filter portion 61b, opening portion 61c, and damper portion 61d. Note that sheet member 61 according to this embodiment is made of resin, for example.

[0039] The connection portion 61a of the sheet member 61 is a portion that is sandwiched between the upper frame member 60 and the lower flow path member 62 and joined with a resin adhesive 80. The filter portion 61b is provided to cover the opening of the common main supply flow path 31, and has a plurality of small-diameter through holes formed therein, allowing the ink to flow through while also functioning as a filter to capture foreign matter in the ink.

[0040] The opening portion 61c is an opening having substantially the same shape and dimensions as the opening of the common main recovery channel 41. A plurality of damper portions 61d are provided side by side in the first direction so as to cover each of the common supply tributary channels 32 and each of the common recovery tributary channels 42. Each damper portion 61d is flexible and has a damping function to attenuate pressure, etc., that is applied to the ink in the pressure chamber 52 and that is propagated to each of the tributary channels 32, 42.

[0041] A restraining member 70 is provided for such a sheet member 61 as shown in FIGS. 7B and 8. Specifically, as shown in FIG. 7B, the restraining member 70 has a frame shape that surrounds the damper portion 61d. In the example shown in FIG. 7B, the restraining member 70 is configured by providing a single thin plate 71 with a plurality of openings 72 corresponding to each damper portion 61d. In other words, the restraining member 70 is configured by connecting a plurality of frames corresponding to one damper portion 61d in the first direction. Note that while the restraining member 70 is provided for the damper portion 61d as described above, it is not provided for the filter portion 61b (see FIG. 7B).

[0042] 8, in the flow path member 62, the upper end of a wall portion 62w that separates the common supply tributary flow path 32 and the common recovery tributary flow path 42 and the sheet member 61 are joined with an adhesive 80. The restraint member 70 is layered on the opposite side of the sheet member 61 from the flow path member 62. In the example of FIG. 8, the restraint member 70 and the wall portion 62w of the flow path member 62 are arranged opposite each other above and below with the sheet member 61 in between. The restraint member 70 has an extended portion 73.

[0043] When viewed along the third direction (i.e., when viewed from the third direction), the extended portions 73 extend inward from the edge portions 32e of the openings of the common supply tributary channel 32 and the edge portions 42e of the openings of the common recovery tributary channel 42 (see also FIG. 8). In the example shown in FIG. 8, the extended portions 73 extend in the first direction along the upper surface of the sheet member 61 while contacting the upper surface of the sheet member 61. Furthermore, such extended portions 73 are provided along the entire periphery surrounding the damper portion 61d. In other words, the entire peripheral portion of the opening 72 of the restraint member 70 is made up of the extended portions 73. However, the extended portions 73 may be provided along only a portion of the entire periphery surrounding the damper portion 61d.

[0044] Such a restraining member 70 is preferably made of a material harder than the sheet member 61. For example, the restraining member 70 can be made of a stainless steel (SUS) plate. The restraining member 70 may also be made of the same material as the flow path member 62.

[0045] Furthermore, the extension dimension L1 of the extension portion 73 from the edge portions 32e, 42e toward the opening is preferably equal to or greater than the sum of the overflow dimension L2 of the adhesive 80 from the edge portions 32e, 42e and the assembly tolerance Lt between the flow path member 62 and the restraining member 70. In this case, as shown in Fig. 8, the area occupied by the restraining member 70 in the first direction is wider than the area occupied by the adhesive 80. Note that, as an example, the extension dimension L1 of the extension portion 73 is preferably set to be L1 ≥ 20 µm or greater when the width dimension L3 of the opening of the common supply branch flow path 32, 42 (the dimension in the first direction in Fig. 8) is 1000 µm or greater.

[0046] [About the effects] As described above, the liquid ejection device 1 according to this embodiment includes the restraint member 70 laminated on the sheet member 61 opposite to the flow path member 62, and the restraint member 70 has the extension portion 73 extending from the edge portions 32e, 42e of the openings of the common paths (the common supply tributary flow path 32 and the common recovery tributary flow path 42 described above) toward the inside of the openings. This prevents deformation of the peripheral portion of the damper portion 61d by the extension portion 73, and prevents ink from coagulating in the adhesive 80 in the portions that protrude from the edge portions 32e, 42e.

[0047] Furthermore, by setting the extension dimension L1 of the extension portion 73 to be equal to or greater than the sum of the overflow dimension L2 of the adhesive 80 and the assembly tolerance Lt, deformation of the damper portion 61d can be effectively suppressed, thereby effectively reducing the occurrence of ink aggregation. Furthermore, as an example, when the width dimension L3 of the tributary channels 32, 42 is 1000 μm, the occurrence of ink aggregation as described above can be effectively reduced by setting the extension dimension L1 to be 20 μm or greater.

[0048] Furthermore, by forming the restraining member 70 from a material harder than the sheet member 61, it is possible to more reliably suppress deformation of the portion of the sheet member 61 that comes into contact with the restraining member 70. Furthermore, if the restraining member 70 and the flow path member 62 are formed from the same material, the amounts of deformation of the restraining member 70 and the flow path member 62 that occur due to temperature changes can be made similar, thereby preventing peeling of the sheet member 61 from the restraining member 70 or the flow path member 62.

[0049] Furthermore, by forming the restraining member 70 in a frame shape that surrounds the damper portion 61d, deformation of the peripheral edge portion of the damper portion 61d can be reliably restrained, and manufacturing efficiency can be improved.

[0050] In this embodiment, an example has been described in which both the sheet member 61 and the adhesive 80 are made of resin. In this case, if the sheet member 61 deforms and repeatedly comes into contact with the protruding portion of the adhesive 80, static electricity is likely to be generated, and ink tends to aggregate. However, the liquid ejection device 1 according to this embodiment includes the restraining member 70 as described above. Therefore, the restraining member 70 prevents the displacement of the portion of the sheet member 61 that may come into contact with, for example, the fillet-shaped protruding portion of the adhesive 80, thereby preventing static electricity from being generated due to repeated contact between the sheet member 61 and the adhesive 80. Therefore, even when both the sheet member 61 and the adhesive 80 are made of resin, ink aggregation can be effectively suppressed.

[0051] Furthermore, the ink of this embodiment contains a colorant made of a polymer. In this case, the ink also tends to aggregate easily, but the liquid ejection device 1 is provided with the restraining member 70, so it is possible to effectively suppress the aggregation of the ink.

[0052] Furthermore, in the liquid ejection device 1, such a restraining member 70 is provided on the damper portion 61d, but not on the filter portion 61b. Both sides (upstream and downstream) of the filter portion 61b are in contact with ink, so the pressure difference acting on both sides is small and deformation is unlikely to occur. Therefore, even if adhesive overflows from the edge of the opening in the filter portion 61b, ink coagulation is unlikely to occur. Therefore, by not providing the restraining member 70 on such a filter portion 61b, the filter portion 61b can be made wider, and the filter function can be improved. [Industrial Applicability]

[0053] The present disclosure can be applied to a liquid ejection device. [Explanation of symbols]

[0054] 1 Liquid discharge device 2 Discharge head 32 Common supply tributary channel (common channel) 42 Common collection tributary (common route) 50 Individual Roads 52 Pressure Chamber 61 Sheet material 61b Filter part 61d Damper part 62 Flow path member 63 Pressure chamber member 64 Nozzle member 70 Restraining member 73 Extension part 80 Adhesive

Claims

1. a nozzle member in which a plurality of nozzles for ejecting liquid are formed; a pressure chamber member in which a plurality of pressure chambers communicating with the plurality of nozzles, respectively, are formed; a flow path member in which a common path connected to a plurality of individual paths communicating with a plurality of pressure chambers is formed; a sheet member having a flexible damper portion that is laminated on the flow path member and bonded with an adhesive to cover at least a portion of the common path; a restraint member laminated on the sheet member opposite to the flow path member, the restraining member has an extension portion that extends inward from an edge of an opening of the common path that is covered by the damper portion when viewed along a stacking direction of the sheet member and the restraining member; Liquid discharge device.

2. an extension dimension of the extension portion from the edge of the opening toward the inside of the opening is equal to or greater than the sum of an overflow dimension of the adhesive from the edge of the opening and an assembly tolerance between the flow path member and the restraint member; The liquid ejection device according to claim 1 .

3. The adhesive and the sheet member are made of resin. The liquid ejection device according to claim 1 .

4. the liquid ejected from the nozzle contains a color material made of a polymer; The liquid ejection device according to claim 1 .

5. a width dimension of the opening of the common channel in the flow channel member is 1000 μm or more, and an extension dimension of the extension portion from an edge of the opening toward the inside of the opening is 20 μm or more; The liquid ejection device according to claim 1 .

6. The restraining member is made of a harder material than the sheet member. The liquid ejection device according to claim 1 .

7. The restraint member and the flow path member are made of the same material. The liquid ejection device according to claim 1 .

8. The restraint member has a frame shape surrounding the damper portion. The liquid ejection device according to claim 1 .

9. the sheet member has a filter portion that captures foreign matter in the liquid in addition to the damper portion, The restraining member is provided in the damper portion and is not provided in the filter portion. The liquid ejection device according to claim 1 .

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