Liquid discharge device

Abstract

To facilitate execution of positioning of nozzles between adjacent heads.SOLUTION: A head unit 1 includes four heads 10A, 10B, 10C, 10D. Each of the heads 10A, 10B, 10C, 10D includes three flow path members 12A, 12B connected to one another. The three flow path members 12A, 12B are constituted by one flow path member 12A and two flow path members 12B. A size of a nozzle surface 125 of each flow path member 12B is smaller than a size of a nozzle surface 125 of the flow path member 12A. The heads 10A, 10B, 10C, 10D are disposed such that projections and recesses due to connections of the flow path members 12A, 12B mutually engage.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a liquid ejection apparatus equipped with a plurality of heads. [Background technology]

[0002] Patent Document 1 shows one head that is long in the main scanning direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-009502 Summary of the Invention [Problem to be solved by the invention]

[0004] The printer in Patent Document 1 uses one head, but it is possible to combine multiple heads. In this case, if the nozzle surface of each head is rectangular as in Patent Document 1, it is difficult to align the nozzles between adjacent heads when arranging multiple heads.

[0005] An object of the present invention is to provide a liquid ejection device that can easily align nozzles between adjacent heads. [Means for solving the problem]

[0006] The liquid ejection device according to the present invention comprises a first head and a second head, each of which comprises a plurality of head units connected to one another, each having a nozzle surface with a plurality of nozzles opening therein, and the sizes of the nozzle surfaces are different from one another, and is characterized in that the first head has a recess that is recessed in a direction along the nozzle surface due to the connection of the plurality of head units, and the second head has a convex portion that protrudes in a direction along the nozzle surface due to the connection of the plurality of head units, and the convex portion is fitted into the concave portion. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a plan view of a printer 100 including a head unit 1 according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the head unit 1. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. 10 is a plan view of a head unit 1′ according to a modified example of the present invention. [Figure 5] FIG. 10 is a plan view of a head unit 2 according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a plan view of a head unit 2′ according to a modified example of the present invention. [Figure 7] FIG. 10 is a plan view of a head unit 2″ according to a modified example of the present invention. [Figure 8] FIG. 10 is a plan view of a head unit 3 according to a third embodiment of the present invention. [Figure 9] FIG. 10 is a plan view of a head unit 3' according to a modified example of the present invention. [Figure 10] FIG. 10 is a plan view of a head unit 4 according to a fourth embodiment of the present invention. [Figure 11] FIG. 10 is a plan view of a head unit 4' according to a modified example of the present invention. [Figure 12] FIG. 10 is a plan view of a printer 200 including a head unit 5 according to a fifth embodiment of the present invention. [Figure 13]FIG. 2 is a plan view of the head unit 5. [Figure 14] FIG. 10 is a plan view of a head unit 6 according to a sixth embodiment of the present invention. [Figure 15] FIG. 13 is a plan view of a head unit 7 according to a seventh embodiment of the present invention. [Figure 16] FIG. 13 is a plan view of a head unit 8 according to an eighth embodiment of the present invention. [Figure 17] FIG. 13 is a plan view of a head unit 9 according to a ninth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] First Embodiment 1 is a first embodiment of a "liquid ejection device" according to the present invention, and is applied to a printer 100. In addition to the head unit 1, the printer 100 includes a housing 100A, a platen 30, a transport unit 40, and a control unit 50. The head unit 1, the platen 30, the transport unit 40, and the control unit 50 are arranged inside the housing 100A.

[0009] The head unit 1 is fixed to a housing 100A. The length of the head unit 1 in the paper width direction is longer than the length of the head unit 1 in the transport direction. The head unit 1 is of a line type.

[0010] The paper width direction is the direction along the width of the paper S and is perpendicular to the vertical direction. The transport direction is the direction in which the paper S is transported by the transport unit 40 and is perpendicular to the vertical direction and the paper width direction. The direction along the transport direction corresponds to the "first direction D1" of the present invention, and the paper width direction corresponds to the "second direction D2" of the present invention.

[0011] The platen 30 is a plate along a plane perpendicular to the vertical direction, and is disposed below the head unit 1. The paper S is supported on the upper surface of the platen 30.

[0012] The conveying section 40 includes a roller pair 41 having two rollers, a roller pair 42 having two rollers, and a conveying motor (not shown). In the conveying direction, the head unit 1 and the platen 30 are arranged between the roller pair 41 and the roller pair 42. When the conveying motor is driven under the control of the control section 50, the rollers of the roller pair 41, 42 rotate. As the rollers of the roller pair 41, 42 rotate, the paper S sandwiched between the rollers of the roller pair 41, 42 is conveyed in the conveying direction.

[0013] Next, the configuration of the head unit 1 will be described in detail with reference to FIGS.

[0014] 2, the head unit 1 includes four heads 10A, 10B, 10C, and 10D. The four heads 10A, 10B, 10C, and 10D have the same shape and size in the plane perpendicular to the vertical direction.

[0015] The four heads 10A, 10B, 10C, and 10D are arranged along the transport direction. Of the four heads 10A, 10B, 10C, and 10D, head 10A is located at the upstream end in the transport direction, head 10D is located at the downstream end in the transport direction, and head 10B is located downstream of head 10A in the transport direction and adjacent to head 10A in the transport direction. Head 10C is located downstream of head 10B in the transport direction and adjacent to head 10B in the transport direction. Head 10D is located downstream of head 10C in the transport direction and adjacent to head 10C in the transport direction.

[0016] Each of the four heads 10A, 10B, 10C, and 10D includes three flow path members 12A and 12B (see FIG. 2) connected to each other, and an actuator member 13 (see FIG. 3).

[0017] The three flow path members 12A, 12B are composed of one flow path member 12A and two flow path members 12B. Each of the three flow path members 12A, 12B has a nozzle surface 125 where a plurality of nozzles 11 open. The nozzle surface 125 is perpendicular to the vertical direction. As shown in FIG. 2, of the three flow path members 12A, 12B, the size of the nozzle surface 125 of two flow path members 12B is the same as each other and is each smaller than the size of the nozzle surface 125 of one flow path member 12A. The flow path member 12A corresponds to the "first flow path member" of the present invention, and the flow path member 12B corresponds to the "second flow path member" of the present invention.

[0018] Flow path members 12B are arranged upstream and downstream in the transport direction relative to one flow path member 12A. In each of heads 10A and 10C, the two flow path members 12B are located on one side in the paper width direction. In each of heads 10B and 10D, the two flow path members 12B are located on the other side in the paper width direction.

[0019] 3, a flow path is formed inside each of the flow path members 12A, 12B. The flow path includes a common flow path 121 that communicates with an ink tank (not shown), and a plurality of individual flow paths 122 that communicate with the common flow path 121. The individual flow path 122 is provided for each nozzle 11, and is a flow path that runs from the outlet of the common flow path 121 to the nozzle 11 via a pressure chamber 123. A plurality of pressure chambers 123 open on the upper surface of each of the flow path members 12A, 12B.

[0020] As shown in Figure 3, the actuator member 13 includes a metal vibration plate 131 arranged on the upper surface of the flow path members 12A and 12B so as to cover the multiple pressure chambers 123, a piezoelectric layer 132 arranged on the upper surface of the vibration plate 131, and multiple individual electrodes 133 arranged on the upper surface of the piezoelectric layer 132 so as to face each of the multiple pressure chambers 123.

[0021] The diaphragm 131 and the plurality of individual electrodes 133 are electrically connected to the driver IC 14. Under the control of the control unit 50, the driver IC 14 maintains the potential of the diaphragm 131 at ground potential, while varying the potential of the individual electrodes 133 between ground potential and a drive potential. As a result, the actuators 13X, which are portions of the diaphragm 131 and the piezoelectric layer 132 sandwiched between each individual electrode 133 and each pressure chamber 123, deform. This changes the volume of the pressure chamber 123, applies pressure to the ink in the pressure chamber 123, and causes ink to be ejected from the nozzle 11.

[0022] As shown in Fig. 2, each of the four heads 10A, 10B, 10C, and 10D has two recesses P1 recessed in a direction perpendicular to the vertical direction and two protrusions P2 protruding in a direction perpendicular to the vertical direction by connecting three flow path members 12A and 12B. The two protrusions P2 are formed by two flow path members 12B. The two recesses P1 are located on one side or the other of the two flow path members 12B in the paper width direction.

[0023] The protrusion P2 of each of the heads 10A, 10B, 10C, and 10D is fitted into the recess P1 of another head adjacent to that head in the transport direction. For example, of the two protrusions P2 of head 10A, the protrusion P2 located downstream in the transport direction is fitted into the recess P1 of the two recesses P1 of head 10B located upstream in the transport direction. Two surfaces that make up the outer surface of the protrusion P2, one along the paper width direction and the other along the transport direction, are in contact with the surface that defines the recess P2.

[0024] One of the two flow path members 12B of each of the heads 10A, 10B, 10C, and 10D and one of the two flow path members 12B of another head adjacent to that head in the transport direction are aligned in the paper width direction. For example, of the two flow path members 12B of head 10A, the flow path member 12B located downstream in the transport direction and of the two flow path members 12B of head 10B, the flow path member 12B located upstream in the transport direction are aligned in the paper width direction.

[0025] Of the four heads 10A, 10B, 10C, and 10D, for example, head 10A corresponds to the "first head" of the present invention, and head 10B corresponds to the "second head" of the present invention.

[0026] The four heads 10A, 10B, 10C, and 10D are manufactured with the nozzles 11 aligned between the three flow path members 12A and 12B, respectively. Therefore, in the manufacturing process of the head unit 1, it is not necessary to align the nozzles 11 within each of the heads 10A, 10B, 10C, and 10D.

[0027] Meanwhile, when arranging the four heads 10A, 10B, 10C, and 10D during the manufacturing process of the head unit 1, it is necessary to align the nozzles 11 between adjacent heads 10A, 10B, 10C, and 10D. In this case, depending on the configuration of the heads 10A, 10B, 10C, and 10D, this alignment may become difficult.

[0028] In this embodiment, each of the heads 10A, 10B, 10C, and 10D has projections and recesses due to the connection of the flow path members 12A and 12B. The projections P2 of each of the heads 10A, 10B, 10C, and 10D are fitted into the recesses P1 of the adjacent heads (see FIG. 2). This allows easy alignment of the nozzles 11 between the adjacent heads 10A, 10B, 10C, and 10D.

[0029] The four heads 10A, 10B, 10C, and 10D have the same shape and size in the plane perpendicular to the vertical direction (see FIG. 2). In this case, the same parts can be used for the heads 10A, 10B, 10C, and 10D, which reduces manufacturing costs compared to when parts are prepared individually.

[0030] Of the two flow path members 12B of head 10A, the flow path member 12B located downstream in the transport direction and of the two flow path members 12B of head 10B, the flow path member 12B located upstream in the transport direction are aligned in the paper width direction (see FIG. 2). In this case, another head, for example, head 10C, can be easily positioned further downstream in the transport direction from these two heads 10A and 10B so that the recesses and projections fit together.

[0031] The arrangement of the four heads can be changed, as in the head unit 1' shown in FIG. 4. In the head unit 1 shown in FIG. 2, the two flow path members 12B are located on the other side of the paper width direction in heads 10B and 10D. In contrast, in the head unit 1' shown in FIG. 4, the two flow path members 12B are located on one side of the paper width direction in heads 10B' and 10D'. The four heads 10A, 10B', 10C, and 10D' are arranged along the paper width direction. The positions of heads 10A and 10C in the transport direction are the same, and the positions of heads 10B' and 10D' in the transport direction are the same. Of the two flow path members 12B of head 10A, the flow path member 12B located downstream in the transport direction, of the two flow path members 12B of head 10B', the flow path member 12B located upstream in the transport direction, of the two flow path members 12B of head 10C, the flow path member 12B located downstream in the transport direction, and of the two flow path members 12B of head 10D', the flow path member 12B located upstream in the transport direction are aligned in the paper width direction.

[0032] Second Embodiment The head unit 2 shown in FIG. 5 is a second embodiment of the "liquid ejection device" according to the present invention.

[0033] The head unit 2 includes two heads 210A and 210B. The two heads 210A and 210B have the same shape and size in a plane perpendicular to the vertical direction. Head 210A corresponds to the "first head" of the present invention, and head 210B corresponds to the "second head" of the present invention.

[0034] The two heads 210A and 210B are arranged along the transport direction. Head 210B is located downstream of head 210A in the transport direction and adjacent to head 210A in the transport direction.

[0035] The two heads 210A and 210B each include two flow path members 12A and 12B connected to each other. The configurations of the flow path members 12A and 12B are the same as those of the flow path members 12A and 12B in the first embodiment, respectively.

[0036] In head 210A, flow path member 12B is located downstream in the transport direction relative to flow path member 12A. In head 210B, flow path member 12B is located upstream in the transport direction relative to flow path member 12A. Flow path member 12B of head 210A and flow path member 12B of head 210B are aligned in the paper width direction.

[0037] According to this embodiment, compared to the case where the head unit 1 (see FIG. 2) of the first embodiment includes only two heads 10A and 10B, the flow path members 12B are not arranged at both ends in the transport direction, and therefore the head unit 2 can be made smaller in the transport direction (see FIG. 5).

[0038] As in the head unit 2' shown in Fig. 6, the position in the paper width direction of the flow path member 12B in each of the heads 210A', 210B' may be reversed from that in the head unit 2 shown in Fig. 5. Specifically, in the head unit 2 shown in Fig. 5, the flow path member 12B of the head 210A is located on the other side in the paper width direction, and the flow path member 12B of the head 210B is located on one side in the paper width direction. In contrast, in the head unit 2' shown in Fig. 6, the flow path member 12B of the head 210A' is located on one side in the paper width direction, and the flow path member 12B of the head 210B' is located on the other side in the paper width direction.

[0039] 6 and the head 210B of FIG. 5 may be combined, as in the head unit 2" shown in FIG. 7. The head unit 2" includes two heads 210A' and two heads 210B. The heads 210A' and the heads 210B are arranged alternately along the paper width direction. The flow path members 12B of the heads 210A' and 210B are aligned in the paper width direction.

[0040] Third Embodiment The head unit 3 shown in FIG. 8 is a third embodiment of the "liquid ejection device" according to the present invention.

[0041] The head unit 3 includes two heads 310A and 310B. The head 310A corresponds to the "first head" of the present invention, and the head 310B corresponds to the "second head" of the present invention.

[0042] The two heads 310A and 310B each include four flow path members 12A and 12B connected to each other. The four flow path members 12A and 12B are configured with one flow path member 12A and three flow path members 12B. The configurations of the flow path members 12A and 12B are the same as those of the flow path members 12A and 12B in the first embodiment.

[0043] Of the three flow path members 12B, one is disposed downstream in the transport direction relative to the flow path member 12A, and two are disposed upstream in the transport direction relative to the flow path member 12A. The flow path member 12A of the head 310A and the two flow path members 12B of the head 310B are aligned in the paper width direction.

[0044] In head 310A, the three flow path members 12B are located on the other side in the paper width direction and are aligned in the transport direction with the other end region in the paper width direction of flow path member 12A. In head 310B, the three flow path members 12B are located on one side in the paper width direction and are aligned in the transport direction with one end region in the paper width direction of flow path member 12A.

[0045] According to this embodiment, each of the heads 310A, 310B includes one flow path member 12A and three flow path members 12B, so that a large number of heads can be arranged so that the projections and recesses fit together. For example, the head unit 3' shown in FIG. 9 includes, in addition to the heads 310A, 310B, a head 310C that is configured by inverting the head 310A in the transport direction. The head 310C is arranged so that it fits into the projections and recesses formed by the two heads 310A, 310B. In addition, the number and arrangement of the heads 310A, 310B can be changed in various ways.

[0046] Furthermore, when the color of ink ejected from the nozzles 11 is varied for each nozzle group 11G corresponding to the length of the flow path member 12B in the transport direction, multiple colors can be developed. For example, the head unit 3 shown in Fig. 8 has three nozzle groups 11G that eject ink of different colors in an area surrounded by a dashed line. The head unit 3' shown in Fig. 9 has five nozzle groups 11G that eject ink of different colors in an area surrounded by a dashed line.

[0047] In each head, the three flow path members 12B are located on one side or the other side in the paper width direction and are aligned in the transport direction with one end region or the other end region in the paper width direction of the flow path member 12A. According to this configuration, as is clear from a comparison of Figures 9 and 11, when five nozzle groups 11G corresponding to five colors are provided, it is sufficient to prepare three heads, and there is no need to prepare four heads as in Figure 11.

[0048] <Fourth embodiment> The head unit 4 shown in FIG. 10 is a fourth embodiment of the "liquid ejection device" according to the present invention.

[0049] The head unit 4 includes two heads 410A. The two heads 410A have the same shape and size in the plane perpendicular to the vertical direction. One of the two heads 410A corresponds to the "first head" of the present invention, and the other corresponds to the "second head" of the present invention.

[0050] Each of the two heads 410A includes four flow path members 12A, 12B connected to each other. The four flow path members 12A, 12B are configured with one flow path member 12A and three flow path members 12B. The configurations of the flow path members 12A, 12B are the same as those of the flow path members 12A, 12B in the first embodiment.

[0051] Of the three flow path members 12B, one is disposed downstream in the transport direction relative to the flow path member 12A, and two are disposed upstream in the transport direction relative to the flow path member 12A. The flow path member 12A of the head 410A on the upper side in Fig. 10 and the two flow path members 12B of the head 410A on the lower side in Fig. 10 are aligned in the paper width direction.

[0052] In each head 410A, one of the three flow path members 12B is located on the other side in the paper width direction and is aligned in the transport direction with the other end region in the paper width direction of the flow path member 12A. In each head 410A, two of the three flow path members 12B are located on one side in the paper width direction and are aligned in the transport direction with one end region in the paper width direction of the flow path member 12A.

[0053] According to this embodiment, similar to the third embodiment (see FIG. 8), each head 310A, 310B includes one flow path member 12A and three flow path members 12B, allowing a large number of heads to be arranged so that their protrusions and recesses fit together. For example, the head unit 4' shown in FIG. 11 includes two heads 410A and two heads 410B configured by inverting the head 410A in the paper width direction. These four heads 410A, 410B are arranged so that their protrusions and recesses fit together. Of the four heads 410A, 410B, for example, the head 410A located on one side of the paper width direction corresponds to the "first head" of the present invention, and the head 410B whose protrusion fits into the recess of the head 410A corresponding to the "first head" of the two heads 410B corresponds to the "second head" of the present invention. In addition, the number and arrangement of the heads 410A, 410B can be changed in various ways.

[0054] Furthermore, multiple colors can be developed by varying the color of ink ejected from the nozzles 11 for each nozzle group 11G corresponding to the length of the flow path member 12B in the transport direction. For example, the head unit 4 shown in Fig. 10 has three nozzle groups 11G that eject ink of different colors in the area surrounded by the dashed line. The head unit 4' shown in Fig. 11 has five nozzle groups 11G that eject ink of different colors in the area surrounded by the dashed line.

[0055] In each head 410A, one of the three flow path members 12B is located on the other side of the paper width direction and is aligned in the transport direction with the other end region of the flow path member 12A in the paper width direction, while two are located on one side of the paper width direction and are aligned in the transport direction with one end region of the flow path member 12A in the paper width direction. According to this configuration, as is clear from a comparison of Figures 8 and 10, for example, when three nozzle groups 11G corresponding to three colors are provided, it is sufficient to prepare two heads 410A that are identical in shape and size, i.e., two types of heads, and there is no need to prepare two heads 310A and 310B that have different shapes, i.e., two types of heads, as shown in Figure 8.

[0056] Fifth Embodiment The head unit 5 shown in Fig. 12 is a fifth embodiment of the "liquid ejection device" according to the present invention, and is applied to a printer 200. The printer 200 differs from the printer 100 in Fig. 1 in that it includes a carriage 20 that holds the head unit 5, and a scanning unit 60 that moves the carriage 20 in the paper width direction. In this embodiment, the paper width direction corresponds to the "first direction D1" of the present invention, and the direction along the transport direction corresponds to the "second direction D2" of the present invention.

[0057] The scanning unit 60 includes a pair of guides 61, 62 that support the carriage 20, and a belt 63 connected to the carriage 20. The guides 61, 62 and the belt 63 extend in the paper width direction. When a scanning motor (not shown) is driven under the control of the control unit 50, the belt 63 runs, and the carriage 20 and head unit 5 move in the paper width direction along the guides 61, 62. The head unit 5 is of a serial type.

[0058] 13, the head unit 5 includes two heads 510A and 510B. The two heads 510A and 510B have the same shape and size in the plane perpendicular to the vertical direction. Head 510A corresponds to the "first head" of the present invention, and head 510B corresponds to the "second head" of the present invention.

[0059] The two heads 510A and 510B are arranged along the paper width direction. The head 510B is located on the other side of the paper width direction relative to the head 510A and is adjacent to the head 510A in the paper width direction.

[0060] The two heads 510A, 510B each include two flow path members 512A, 512B connected to each other. The size of the nozzle surface 125 of the flow path member 512B is smaller than the size of the nozzle surface 125 of the flow path member 512A. The flow path member 512A corresponds to the "first flow path member" of the present invention, and the flow path member 512B corresponds to the "second flow path member" of the present invention.

[0061] In head 510A, flow path member 512B is located on the other side in the paper width direction relative to flow path member 512A. In head 510B, flow path member 512B is located on one side in the paper width direction relative to flow path member 512A. Flow path member 512B of head 510A and flow path member 512B of head 510B are aligned in the transport direction.

[0062] In head 510A, flow path member 512B overlaps in the paper width direction with the upstream end region in the transport direction of flow path member 512A and protrudes upstream in the transport direction from flow path member 512A. In head 510B, flow path member 512B overlaps in the paper width direction with the downstream end region in the transport direction of flow path member 512A and protrudes downstream in the transport direction from flow path member 512A.

[0063] The nozzle surface 125 of the flow path member 512A includes a nozzle region Xa in which a plurality of nozzles 11 are arranged, and margin regions Y1a and Y2 other than the nozzle region Xa. The nozzle surface 125 of the flow path member 512B includes a nozzle region Xb in which a plurality of nozzles 11 are arranged, and margin regions Y1b and Y2b other than the nozzle region Xb.

[0064] The marginal regions Y1a and Y1b are located on one side of the nozzle regions Xa and Xb in the transport direction. The marginal regions Y2a and Y2b are located on the other side of the nozzle regions Xa and Xb in the transport direction. The one side of the transport direction is the direction in which the flow path member 512B of another head adjacent to the head is located relative to the flow path member 512B of the head in question, and is downstream in the transport direction for head 510A and upstream in the transport direction for head 510B.

[0065] The length (=A) of the nozzle region Xb in the transport direction is half the length (=2A) of the nozzle region Xa in the transport direction.

[0066] In each of the heads 510A and 510B, the nozzle region Xb has an overlapping region R1 that overlaps with the nozzle region Xa in the paper width direction, and a non-overlapping region R2 that does not overlap with the nozzle region Xa in the paper width direction.

[0067] Here, if the length of the nozzle region Xb in the transport direction is "A" and the length of the overlap region R1 in the transport direction is "B," then the length of each marginal region Y1a, Y2a in the transport direction is "A / 2-B." The length of the non-overlapping region R2 in the transport direction is "AB." The length of the marginal region Y1b, i.e., the portion adjacent to the overlap region R1 in the transport direction, in the transport direction is also "AB."

[0068] The flow path member 512B of the head 510A and the flow path member 512B of the head 510B are aligned in the transport direction with their marginal regions Y1b adjacent to each other in the transport direction.

[0069] If the margin area Y1b is small and the overlap area R1 is large, it becomes necessary to perform control such as preventing ejection from some of the nozzles 11 in the overlap area R1. Furthermore, there will be unused nozzles 11, resulting in wasted manufacturing costs. In contrast, according to this embodiment, the margin area Y1b is relatively large and the overlap area R1 is small, so the above-mentioned control is not necessary and no wasted manufacturing costs are incurred.

[0070] Sixth Embodiment The head unit 6 shown in Fig. 14 is a sixth embodiment of the "liquid ejection device" according to the present invention, and is applied to the printer 100 in Fig. 1. That is, the type of head unit 6 is a line type.

[0071] The head unit 6 includes four heads 510A, 510B, 510C, and 510D. The configuration of each of the heads 510A, 510B, 510C, and 510D is the same as that of the heads 510A and 510B of the fifth embodiment (see FIG. 13). The head unit 6 of this embodiment differs from the head unit 5 of the fifth embodiment in the number of heads and the arrangement of the heads.

[0072] The four heads 510A, 510B, 510C, and 510D are arranged along the paper width direction. Of the four heads 510A, 510B, 510C, and 510D, head 510A is located at one end of the paper width direction, head 510D is located at the other end of the paper width direction, and head 510B is located on the other side of the paper width direction from head 510A and adjacent to head 510A in the paper width direction. Head 510C is located on the other side of the paper width direction from head 510B and adjacent to head 510B in the paper width direction. Head 510D is located on the other side of the paper width direction from head 510C and adjacent to head 510C in the paper width direction.

[0073] In each of the heads 510A, 510B, 510C, and 510D, the flow path member 512B is located upstream in the transport direction relative to the flow path member 512A. The flow path members 512A of the four heads 510A, 510B, 510C, and 510D are aligned in the paper width direction. The flow path members 512B of the four heads 510A, 510B, 510C, and 510D are aligned in the paper width direction.

[0074] In each of the heads 510A, 510B, 510C, and 510D, the flow path member 512B overlaps with one end region of the flow path member 512A in the paper width direction, and protrudes from the flow path member 512A to one side in the paper width direction.

[0075] In each of the heads 510A, 510B, 510C, and 510D, the nozzle region Xa has an overlap region T1 that overlaps with the nozzle region Xb in the transport direction, and a non-overlapping region T2 that does not overlap with the nozzle region Xb in the transport direction.

[0076] Here, if the length of the nozzle region Xb in the paper width direction is "A" and the length of the overlap region T1 in the paper width direction is "B," then the length of each marginal region Y1a, Y2a in the paper width direction is "A / 2-B." The marginal region Y2a is adjacent to the nozzle region Xa on one side in the paper width direction and corresponds to the "first portion" of the present invention. The marginal region Y1a is adjacent to the nozzle region Xa on the other side in the paper width direction and corresponds to the "second portion" of the present invention.

[0077] The flow path member 512A of the head 510A, the flow path member 512A of the head 510B, the flow path member 512A of the head 510C, and the flow path member 512A of the head 510D are aligned in the paper width direction with the margin areas Y1a and Y2a adjacent to each other in the paper width direction.

[0078] If the marginal areas Y1a, Y2a are small and the overlapping area T1 is large, it becomes necessary to perform control such as preventing ejection from some of the nozzles 11 in the overlapping area T1. Furthermore, there will be unused nozzles 11, resulting in wasted manufacturing costs. In contrast, according to this embodiment, the marginal areas Y1a, Y2a are relatively large and the overlapping area T1 is small, so the above-mentioned control is not necessary and no wasted manufacturing costs are incurred.

[0079] Seventh Embodiment The head unit 7 shown in FIG. 15 is a seventh embodiment of the "liquid ejection device" according to the present invention, and is applied to the printer 200 of FIG. 12. That is, the type of head unit 7 is a serial type. In this embodiment, as in the fifth embodiment, the paper width direction corresponds to the "first direction D1" of the present invention, and the direction along the transport direction corresponds to the "second direction D2" of the present invention.

[0080] The head unit 7 includes two heads 710A and 710B. The two heads 710A and 710B have the same shape and size in a plane perpendicular to the vertical direction. Head 710A corresponds to the "first head" of the present invention, and head 710B corresponds to the "second head" of the present invention.

[0081] The two heads 710A and 710B are arranged along the paper width direction. The head 710B is located on the other side of the paper width direction relative to the head 510A, and is adjacent to the head 710A in the paper width direction.

[0082] The two heads 710A, 710B each include three flow path members 712A, 712B connected to each other. The three flow path members 712A, 712B are composed of one flow path member 712A and two flow path members 712B. Of the three flow path members 12A, 12B, the size of the nozzle surface 125 of two flow path members 712B is the same as each other and is smaller than the size of the nozzle surface 125 of the single flow path member 712A. The flow path member 712A corresponds to the "first flow path member" of the present invention, and the flow path member 12B corresponds to the "second flow path member" of the present invention. For one flow path member 712A, flow path members 712B are arranged on one side and the other side in the paper width direction.

[0083] The flow path member 512B of the head 510A and the flow path member 512B of the head 510B are aligned in the transport direction.

[0084] In head 710A, the two flow path members 712B each overlap in the paper width direction with the downstream end region in the transport direction of flow path member 712A and protrude downstream in the transport direction from flow path member 712A. In head 710B, the two flow path members 712B each overlap in the paper width direction with the upstream end region in the transport direction of flow path member 712A and protrude upstream in the transport direction from flow path member 712A.

[0085] In each of the heads 710A and 710B, the nozzle regions Xb of the two flow path members 712B overlap each other in the paper width direction. Also, in each of the heads 710A and 710B, the nozzle regions Xb of the two flow path members 712B have non-overlapping regions that do not overlap with the nozzle region Xa of the flow path member 712A in the paper width direction.

[0086] In each of the heads 710A, 710B, one of the two flow path members 712B has a nozzle group 11G made up of nozzles 11 that eject black ink, and the other of the two flow path members 712B has a nozzle group 11G made up of nozzles 11 that eject cyan ink. In each of the heads 710A, 710B, an area of ​​the flow path member 712A adjacent to the one flow path member 712B in the paper width direction has a nozzle group 11G made up of nozzles 11 that eject cyan ink, and an area of ​​the flow path member 712A adjacent to the other flow path member 712B in the paper width direction has a nozzle group 11G made up of nozzles 11 that eject black ink.

[0087] In other words, in the region where the two flow path members 712B are arranged from one side to the other in the paper width direction, a nozzle group 11G made up of nozzles 11 that eject black ink and a nozzle group 11G made up of nozzles 11 that eject cyan ink are arranged in that order. In the region where the flow path member 712A is arranged from the other side to one side in the paper width direction, a nozzle group 11G made up of nozzles 11 that eject black ink and a nozzle group 11G made up of nozzles 11 that eject cyan ink are arranged in that order.

[0088] Black corresponds to the "first color" of the present invention, and the nozzles 11 that eject black ink correspond to the "first color nozzles" of the present invention. Cyan corresponds to the "second color" of the present invention, and the nozzles 11 that eject cyan ink correspond to the "second color nozzles" of the present invention.

[0089] According to this embodiment, the overlapping order of each color ink can be aligned when the head unit 7 moves from one side to the other in the paper width direction and when the head unit 7 moves from the other side to one side in the paper width direction. Specifically, when the head unit 7 moves from one side to the other in the paper width direction, cyan ink and black ink can be caused to land on the paper S in that order in the area where the two flow path members 712B are arranged, and when the head unit 7 moves from the other side to one side in the paper width direction, cyan ink and black ink can be caused to land on the paper S in that order in the area where the flow path member 712A is arranged. This makes it possible to prevent color banding. Color banding refers to differences in color caused by differences in the overlapping order of each color ink on the paper S.

[0090] Eighth Embodiment The head unit 8 shown in Figure 16 is an eighth embodiment of the "liquid ejection device" according to the present invention, and is applied to the printer 100 in Figure 1. That is, the type of head unit 6 is a line type.

[0091] The head unit 8 includes two heads 810A and 810B. The two heads 810A and 810B have the same shape and size in the plane perpendicular to the vertical direction. Head 810A corresponds to the "first head" of the present invention, and head 810B corresponds to the "second head" of the present invention.

[0092] The two heads 810A and 810B are arranged along the paper width direction. The head 810B is located on the other side of the paper width direction relative to the head 810A, and is adjacent to the head 810A in the paper width direction.

[0093] The two heads 810A, 810B each include two flow path members 812A, 812B connected to each other. The size of the nozzle surface 125 of the flow path member 812B is smaller than the size of the nozzle surface 125 of the flow path member 812A. The flow path member 812A corresponds to the "first flow path member" of the present invention, and the flow path member 812B corresponds to the "second flow path member" of the present invention.

[0094] In head 810A, flow path member 812B is located downstream in the transport direction relative to flow path member 812A. In head 810B, flow path member 812B is located upstream in the transport direction relative to flow path member 812A.

[0095] The flow path member 812A of the head 810A and the flow path member 812B of the head 810B are aligned in the paper width direction. The flow path member 812B of the head 810A and the flow path member 812A of the head 810B are aligned in the paper width direction.

[0096] In head 810A, flow path member 812B overlaps in the transport direction with the other end region in the paper width direction of flow path member 812A and protrudes in the other direction in the paper width direction from flow path member 812A. In head 810B, flow path member 812B overlaps in the transport direction with one end region in the paper width direction of flow path member 812A and protrudes in one direction in the paper width direction from flow path member 812A.

[0097] In the paper width direction, the overlapping region T1 of the flow path member 812A of the head 810A and the overlapping region R1 of the flow path member 812B of the head 810A are arranged between the non-overlapping region T2 of the flow path member 812A of the head 810A and the non-overlapping region R2 of the flow path member 812B of the head 810A.

[0098] In the paper width direction, the overlapping region T1 of the flow path member 812A of the head 810B and the overlapping region R1 of the flow path member 812B of the head 810B are arranged between the non-overlapping region T2 of the flow path member 812A of the head 810B and the non-overlapping region R2 of the flow path member 812B of the head 810B.

[0099] The flow path member 812A of the head 810A is located on one side in the paper width direction relative to the flow path member 812A of the head 810B.

[0100] A first nozzle 111, which is one of the multiple nozzles 11 in a flow path member 812B of head 810A, and a second nozzle 112, which is one of the multiple nozzles 11 in a flow path member 812B of head 810B, are arranged at a distance L1 in the transport direction. A third nozzle 113, which is one of the multiple nozzles 11 in a flow path member 812B of head 810A, and a fourth nozzle 114, which is one of the multiple nozzles 11 in a flow path member 812A of head 810A, are arranged at a distance L2 in the transport direction. Distance L1 is smaller than distance L2.

[0101] The first nozzle 111 is one of the multiple nozzles 11 in the flow path member 812B of the head 810A that is disposed at the other end in the paper width direction and is contiguous with the second nozzle 112 in the paper width direction. The third nozzle 113 is one of the multiple nozzles 11 in the flow path member 812B of the head 810A that is disposed at one end in the paper width direction and is contiguous with the fourth nozzle 114 in the paper width direction. The flow path member 812B of the head 810A and the flow path member 812B of the head 810B are aligned using the first nozzle 111 and the second nozzle 112 as references. The third nozzle 113 and the fourth nozzle 114 serve as references for determining the relative positional relationship between the nozzles 11 in the flow path member 812A of the head 810A and the nozzles 11 in the flow path member 812B of the head 810A.

[0102] According to this embodiment, it is possible to easily align the nozzles 11 between the heads 810A and 810B using the first nozzles 111 and the second nozzles 112, which have a small distance L1, as a reference.

[0103] Ninth Embodiment The head unit 9 shown in Figure 17 is a ninth embodiment of the "liquid ejection device" according to the present invention, and is applied to the printer 100 in Figure 1. That is, the type of head unit 6 is a line type.

[0104] The head unit 9 includes two heads 810A and 810B. The configuration of each of the heads 810A and 810B is the same as that of the heads 810A and 810B of the eighth embodiment (see FIG. 16). The head unit 9 of this embodiment differs from the head unit 8 of the eighth embodiment in the arrangement of the heads.

[0105] The two heads 810A and 810B are arranged along the paper width direction. The head 810B is located on the other side of the paper width direction relative to the head 810A, and is adjacent to the head 810A in the paper width direction.

[0106] The two heads 810A and 810B each include two flow path members 812A and 812B that are connected to each other. The configurations of the flow path members 812A and 812B are the same as those of the flow path members 812A and 812B in the eighth embodiment, respectively.

[0107] In head 810A, flow path member 812B is located upstream in the transport direction relative to flow path member 812A. In head 810B, flow path member 812B is located downstream in the transport direction relative to flow path member 812A.

[0108] The flow path member 812A of the head 810A and the flow path member 812B of the head 810B are aligned in the paper width direction. The flow path member 812B of the head 810A and the flow path member 812A of the head 810B are aligned in the paper width direction.

[0109] In head 810A, flow path member 812B overlaps in the transport direction with one end region in the paper width direction of flow path member 812A and protrudes in one direction in the paper width direction from flow path member 812A. In head 810B, flow path member 812B overlaps in the transport direction with the other end region in the paper width direction of flow path member 812A and protrudes in the other direction in the paper width direction from flow path member 812A.

[0110] In the paper width direction, the overlapping region R1 of the flow path member 812B of the head 810A and the overlapping region T1 of the flow path member 812A of the head 810A are arranged between the non-overlapping region R2 of the flow path member 812B of the head 810A and the non-overlapping region T2 of the flow path member 812A of the head 810A.

[0111] In the paper width direction, the overlapping region R1 of the flow path member 812B of the head 810B and the overlapping region T1 of the flow path member 812A of the head 810B are arranged between the non-overlapping region R2 of the flow path member 812B of the head 810B and the non-overlapping region T2 of the flow path member 812A of the head 810B.

[0112] The flow path member 812B of the head 810A is located on one side in the paper width direction relative to the flow path member 812B of the head 810B.

[0113] A fifth nozzle 115, which is one of the multiple nozzles 11 in a flow path member 812A of head 810A, and a sixth nozzle 116, which is one of the multiple nozzles 11 in a flow path member 812A of head 810B, are arranged at a distance M1 in the transport direction. A seventh nozzle 117, which is one of the multiple nozzles 11 in a flow path member 812A of head 810A, and an eighth nozzle 118, which is one of the multiple nozzles 11 in a flow path member 812B of head 810A, are arranged at a distance M2 in the transport direction. The distance M1 is smaller than the distance M2.

[0114] The fifth nozzle 115 is one of the multiple nozzles 11 in the flow path member 812A of the head 810A that is disposed at the other end in the paper width direction and is contiguous with the sixth nozzle 116 in the paper width direction. The seventh nozzle 117 is one of the multiple nozzles 11 in the flow path member 812A of the head 810A that is disposed at one end in the paper width direction and is contiguous with the eighth nozzle 118 in the paper width direction. The flow path member 812A of the head 810A and the flow path member 812A of the head 810B are aligned using the fifth nozzle 115 and the sixth nozzle 116 as references. The seventh nozzle 117 and the eighth nozzle 118 serve as references for determining the relative positional relationship between the nozzles 11 in the flow path member 812A of the head 810A and the nozzles 11 in the flow path member 812B of the head 810A.

[0115] According to this embodiment, it is possible to easily align the nozzles 11 between the heads 810A and 810B using the fifth nozzle 115 and the sixth nozzle 116, which have a small distance M1, as a reference.

[0116] <Modification> Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design modifications are possible within the scope of the claims.

[0117] For example, the number of heads that make up the head unit and the arrangement of the multiple heads can be changed in various ways.

[0118] Although the recessed and protruding portions each have a shape with corners in the above-described embodiment, they may also have a curved shape.

[0119] The first flow path member and the second flow path member may have the same or different numbers of nozzles per unit area or resolution. When the first flow path member and the second flow path member have different numbers of nozzles per unit area or resolution, it is desirable that the second flow path member have a larger number of nozzles per unit area or a higher resolution than the first flow path member. For example, if the area of ​​the nozzle surface of the second flow path member is half the area of ​​the nozzle surface of the first flow path member and the resolution of the second flow path member is twice that of the first flow path member, when multiple heads are connected in a line, the resolution of the entire liquid ejection device including the multiple heads can be made constant even if the resolution of the first flow path member and the second flow path member are different.

[0120] The ejection target is not limited to paper, but may be, for example, cloth, a substrate, a plastic member, or the like.

[0121] The liquid ejected from the nozzles is not limited to ink, but may be any liquid (for example, a treatment liquid that aggregates or precipitates components in the ink, etc.).

[0122] The present invention is not limited to printers, but can also be applied to facsimiles, copiers, multifunction machines, etc. The present invention can also be applied to liquid ejection devices used for purposes other than image recording (for example, liquid ejection devices that eject conductive liquid onto a substrate to form a conductive pattern). [Explanation of symbols]

[0123] 1,1';2,2',2";3,3';4,4';5;6;7;8;9 Head unit (liquid ejection device) 10A, 10A'; 210A, 210A'; 310A; 410A; 510A; 710A; 810A; 910A Head (1st Head) 10B, 10B'; 210B, 210B'; 310B; 410A; 510B; 710B; 810B; 910B head (second head) 11 nozzles 111 No. 1 nozzle 112 Second nozzle 113 Third nozzle 114 4th nozzle 115 5th nozzle 116 No. 6 nozzle 117 No. 7 nozzle 118 No. 8 nozzle 12A; 512A; 712B; 812A Flow path member (first flow path member) 12B; 512B; 712B; 812B Flow path member (second flow path member) 125 Nozzle surface P1 recess P2 convex part R1;T1 overlap region R2;T2 Non-overlapping region Xa,Xb nozzle area Y1a, Y2a, Y1b, Y2b Margin area

Claims

1. a first head and a second head; the first head and the second head each include a plurality of flow path members connected to each other, each having a nozzle surface with a plurality of nozzles opening therein, and the sizes of the nozzle surfaces are different from each other; the first head has a recess that is recessed in a direction along the nozzle surface by connecting the plurality of flow path members, the second head has a convex portion that protrudes in a direction along the nozzle surface by connecting the plurality of flow path members, A liquid ejection device, wherein the convex portion is fitted into the concave portion.

2. The liquid ejection device according to claim 1 , wherein the first head and the second head have the same shape and size of the surface along the nozzle surface.

3. the plurality of flow path members include a first flow path member and two second flow path members each having a nozzle surface smaller in size than the first flow path member, the two second flow path members being arranged on one side and the other side of a first direction along the nozzle surface relative to the first flow path member, 2. The liquid ejection device according to claim 1, wherein one of the two second flow path members of the first head and one of the two second flow path members of the second head are aligned in a second direction that is perpendicular to the first direction and along the nozzle surface.

4. the plurality of flow path members include a first flow path member and a second flow path member having a nozzle surface smaller in size than the first flow path member and disposed in a first direction along the nozzle surface relative to the first flow path member, 2. The liquid ejection device according to claim 1, wherein the second flow path member of the first head and the second flow path member of the second head are aligned in a second direction that is perpendicular to the first direction and along the nozzle surface.

5. the plurality of flow path members include a first flow path member and three second flow path members each having a nozzle surface smaller in size than the first flow path members, one of the three second flow path members is disposed on one side in a first direction along the nozzle surface with respect to the first flow path member, and two of the three second flow path members are disposed on the other side in the first direction with respect to the first flow path member; 2. The liquid ejection device according to claim 1, wherein the first flow path member of the first head and the two second flow path members of the second head are aligned in a second direction that is perpendicular to the first direction and along the nozzle surface.

6. The liquid ejection device according to claim 5 , wherein the three second flow path members are aligned in the first direction with one end region of the first flow path member in the second direction.

7. The liquid ejection device described in claim 5, characterized in that, of the three second flow path members, one second flow path member is aligned in the first direction with one end region of the first flow path member in the second direction, and the two second flow path members are aligned in the first direction with the other end region of the first flow path member in the second direction.

8. the plurality of flow path members include a first flow path member and a second flow path member having a nozzle surface smaller in size than the first flow path member and disposed in a first direction along the nozzle surface relative to the first flow path member, the nozzle surface includes a nozzle region in which the plurality of nozzles are arranged and a margin region other than the nozzle region, the nozzle region of the second flow path member has a length in a second direction perpendicular to the first direction and along the nozzle surface that is half the length of the nozzle region of the first flow path member, and has an overlapping region that overlaps with the nozzle region of the first flow path member in the first direction, and a non-overlapping region that does not overlap with the nozzle region of the first flow path member in the first direction, a length in the second direction of a portion of the margin region of the second flow path member that is adjacent to the overlap region in the second direction is "A-B" (where A is the length in the second direction of the nozzle region of the second flow path member, and B is the length in the second direction of the overlap region), 2. The liquid ejection device according to claim 1, wherein the second flow path member of the first head and the second flow path member of the second head are aligned in the second direction with the portions adjacent to each other in the second direction.

9. the nozzle surface includes a nozzle region in which the plurality of nozzles are arranged and a margin region other than the nozzle region, the plurality of flow path members include a first flow path member and a second flow path member having a nozzle surface smaller in size than the first flow path member and disposed in a first direction along the nozzle surface relative to the first flow path member, the nozzle region of the first flow path member has a length in a second direction perpendicular to the first direction and along the nozzle surface that is twice the length of the nozzle region of the second flow path member, and has an overlapping region that overlaps with the nozzle region of the second flow path member in the first direction, and a non-overlapping region that does not overlap with the nozzle region of the second flow path member in the first direction, in the first flow path member, a first portion in the margin region adjacent to the nozzle region on one side in the second direction, and a second portion in the margin region adjacent to the nozzle region on the other side in the second direction, each have a length in the second direction of "A / 2-B" (where A is the length in the second direction of the nozzle region of the second flow path member, and B is the length in the second direction of the overlap region), 2. The liquid ejection device according to claim 1, characterized in that the first flow path member of the first head and the first flow path member of the second head are aligned in the second direction with the first portion and the second portion adjacent to each other in the second direction.

10. the nozzle surface includes a nozzle region in which the plurality of nozzles are arranged and a margin region other than the nozzle region, the plurality of flow path members include a first flow path member and two second flow path members each having a nozzle region smaller in size than the first flow path member, the two second flow path members being arranged on one side and the other side of the first flow path member in a first direction along the nozzle surface, the nozzle regions of the two second flow path members overlap each other in the first direction and have a non-overlapping region that does not overlap with the nozzle region of the first flow path member in the first direction, the plurality of nozzles include first color nozzles that eject a liquid of a first color, and second color nozzles that eject a liquid of a second color different from the first color, one of the two second flow path members has the first color nozzle, the other of the two second flow path members has the second color nozzle, an area of ​​the first flow path member adjacent to one of the second flow path members in the first direction includes the second color nozzles; The liquid ejection device according to claim 1 , wherein the first color nozzles are provided in an area of ​​the first flow path member adjacent to the other second flow path member in the first direction.

11. the plurality of flow path members include a first flow path member and a second flow path member having a nozzle surface smaller in size than the first flow path member and disposed in a first direction along the nozzle surface relative to the first flow path member, the first flow path member and the second flow path member each have an overlapping region in which they overlap with each other in the first direction and a non-overlapping region in which they do not overlap with each other in the first direction, in a second direction orthogonal to the first direction and along the nozzle surface, the overlapping region of the first flow path member of the first head and the overlapping region of the second flow path member of the first head are disposed between the non-overlapping region of the first flow path member of the first head and the non-overlapping region of the second flow path member of the first head, the overlapping region of the first flow path member of the second head and the overlapping region of the second flow path member of the second head are disposed between the non-overlapping region of the first flow path member of the second head and the non-overlapping region of the second flow path member of the second head, and the first flow path member of the first head is located on one side in the second direction with respect to the first flow path member of the second head, a distance in the first direction between a first nozzle that is one of the plurality of nozzles of the second flow path member of the first head and a second nozzle that is one of the plurality of nozzles of the second flow path member of the second head, the distance being a distance between a third nozzle, which is one of the plurality of nozzles of the second flow path member of the first head, and a fourth nozzle, which is one of the plurality of nozzles of the first flow path member of the first head, in the first direction, being smaller than the distance between the third nozzle, which is one of the plurality of nozzles of the second flow path member of the first head, and a fourth nozzle, which is one of the plurality of nozzles of the first flow path member of the first head, the first nozzle is one of the plurality of nozzles of the second flow path member of the first head, and is arranged at the other end in the second direction so as to be continuous with the second nozzle in the second direction; A liquid ejection device described in any one of claims 1 to 10, characterized in that the third nozzle is one of the plurality of nozzles of the second flow path member of the first head, and is arranged continuously in the second direction with the fourth nozzle at one end in the second direction.

12. the plurality of flow path members include a first flow path member and a second flow path member having a nozzle surface smaller in size than the first flow path member and disposed in a first direction along the nozzle surface relative to the first flow path member, the first flow path member and the second flow path member each have an overlapping region in which they overlap with each other in the first direction and a non-overlapping region in which they do not overlap with each other in the first direction, in a second direction orthogonal to the first direction and along the nozzle surface, the overlapping region of the second flow path member of the first head and the overlapping region of the first flow path member of the first head are disposed between the non-overlapping region of the second flow path member of the first head and the non-overlapping region of the first flow path member of the first head, the overlapping region of the second flow path member of the second head and the overlapping region of the first flow path member of the second head are disposed between the non-overlapping region of the second flow path member of the second head and the non-overlapping region of the first flow path member of the second head, and the second flow path member of the first head is located on one side in the second direction with respect to the second flow path member of the second head, The distance in the first direction between a fifth nozzle that is one of the plurality of nozzles of the first flow path member of the first head and a sixth nozzle that is one of the plurality of nozzles of the first flow path member of the second head is a distance between a seventh nozzle, which is one of the plurality of nozzles of the first flow path member of the first head, and an eighth nozzle, which is one of the plurality of nozzles of the second flow path member of the first head, in the first direction; the fifth nozzle is one of the plurality of nozzles of the first flow path member of the first head, and is arranged at the other end in the second direction, continuously with the sixth nozzle, A liquid ejection device described in any one of claims 1 to 10, characterized in that the seventh nozzle is one of the plurality of nozzles of the first flow path member of the first head, and is arranged continuously in the second direction with the eighth nozzle at one end in the second direction.

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